Title of invention: Battery pack including fire extinguishing unit
technical field
[One]
The present invention relates to a battery pack including a fire extinguishing unit, and more particularly, to a battery pack that reduces the risk of secondary ignition or explosion.
[2]
This application is an application for priority claiming Korean Patent Application No. 10-2019-0115463 filed on September 19, 2019, and all contents disclosed in the specification and drawings of the application are incorporated herein by reference.
background
[3]
Currently commercialized secondary batteries include nickel cadmium batteries, nickel hydride batteries, nickel zinc batteries, and lithium secondary batteries. Among them, lithium secondary batteries have almost no memory effect compared to nickel-based secondary batteries, so charging and discharging are free, The self-discharge rate is very low and the energy density is high, attracting attention.
[4]
These lithium secondary batteries mainly use a lithium-based oxide and a carbon material as a positive electrode active material and a negative electrode active material, respectively. A lithium secondary battery includes an electrode assembly in which a positive electrode plate and a negative electrode plate to which the positive electrode active material and the negative electrode active material are applied, respectively, are disposed with a separator interposed therebetween, and a packaging material for sealing and housing the electrode assembly together with an electrolyte, that is, a battery pouch exterior material.
[5]
Recently, secondary batteries have been widely used not only in small devices such as portable electronic devices, but also in medium and large devices such as automobiles and power storage devices. When used in such a medium-large device, a large number of secondary batteries are electrically connected to increase capacity and output. In particular, a pouch-type secondary battery is widely used in such a medium-large device due to the advantage of easy stacking.
[6]
On the other hand, in recent years, as the need for a large-capacity structure including use as an energy storage source increases, a plurality of secondary batteries electrically connected in series and/or parallel, and a battery module and battery management system (BMS) accommodating these secondary batteries therein Demand for battery packs with
[7]
In addition, such a battery pack is generally provided with an external housing made of a metal material in order to protect the plurality of secondary batteries from external impact or to accommodate and store. Meanwhile, demand for high-capacity battery packs is increasing recently.
[8]
However, the battery pack or battery rack of the prior art includes a plurality of battery modules, and when a secondary battery of each battery module causes thermal runaway, ignites or explodes, heat or flame is transferred to an adjacent secondary battery. There are cases where a secondary explosion or the like occurs, and efforts are being made to prevent secondary ignition or explosion.
[9]
Accordingly, when a thermal runaway occurs in some secondary batteries in a battery pack or battery rack, there is a need for fast and complete fire extinguishing technology to take immediate action. In addition, even if the battery management system does not operate or malfunction, there is a need for a method for stably extinguishing fire.
DETAILED DESCRIPTION OF THE INVENTION
technical challenge
[10]
Accordingly, the present invention has been devised to solve the above problems, and an object of the present invention is to provide a battery pack that reduces the risk of secondary ignition or explosion.
[11]
Other objects and advantages of the present invention may be understood by the following description, and will become more clearly understood by the examples of the present invention. Further, it will be readily apparent that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.
means of solving the problem
[12]
The battery pack according to the present invention for achieving the above object,
[13]
at least one battery module having a cell assembly having a plurality of secondary batteries arranged in one direction and arranged in one direction; and
[14]
A fire extinguishing tank containing a fire extinguishing agent therein, a pipe connected to supply the fire extinguishing agent from the fire tank to the at least one battery module, and when the internal gas of the battery module rises above a predetermined temperature, the fire extinguishing agent from the fire tank and a fire-fighting unit having a fire-extinguishing valve in which an outlet is opened as a part of the internal configuration is modified by the internal gas whose temperature is increased so as to be supplied to the inside of the battery module.
[15]
In addition, the fire extinguishing valve,
[16]
a glass bulb configured to close the outlet and to open the outlet by at least a portion being damaged when exposed to internal gas above a predetermined temperature of the battery module; and
[17]
A dispersing unit configured to disperse the extinguishing agent discharged from the outlet may be provided.
[18]
Moreover, the battery module,
[19]
a module housing having an interior space capable of accommodating the cell assembly; and
[20]
A gas passage disposed inside the module housing and configured to discharge gas generated from the cell assembly to the outside may be provided.
[21]
And, in the fire extinguishing valve, the glass bulb may be located in a portion of the gas passage.
[22]
Further, the battery module,
[23]
a blower mounted on the front end of the module housing and configured to introduce external air into the module housing; and
[24]
A gas outlet formed at the rear end of the module housing and connected to the gas passage may be provided.
[25]
In addition, the gas passage,
[26]
a supply unit located on one side of the cell assembly in the left and right direction and configured to move the external air introduced by the blower to the rear end of the module housing; and
[27]
It may be provided with a discharge part located on the other side of the left and right direction of the cell assembly configured to move the external air introduced by the blower to the gas outlet.
[28]
In addition, at least a portion of the fire extinguishing valve may be located at a portion of the supply unit or the discharge unit.
[29]
Further, the fire extinguishing valve may be located at the rear end of the supply part of the gas passage, and at least a portion may be inserted into the module housing from the rear of the battery module.
[30]
In addition, the fire extinguishing valve may be located at the middle of the supply part of the gas passage and inserted into the module housing from one side of the battery module in the left and right direction.
[31]
Furthermore, the battery module may include a guide block having an inclined surface for guiding the gas generated from the cell assembly to flow facing the exposed portion of the glass bulb.
[32]
In addition, the battery module may include a tube member whose tube diameter is gradually reduced in a direction in which the gas is introduced so as to induce the gas generated from the cell assembly to be collected at the exposed portion of the glass bulb.
[33]
Further, the fire extinguishing valve,
[34]
a top portion provided with the outlet and configured to close the outlet by the glass bulb;
[35]
a connection portion extending from the top portion to cover the glass bulb and configured to secure the glass bulb;
[36]
a plurality of dispersing projections extending from the dispersing part so that the extinguishing material discharged from the outlet is dispersed; and
[37]
It may further include a gas guide belt extending from the top and having a structure that is spread in at least two or more directions among left and right vertical directions.
[38]
In addition, the battery rack according to the present invention for achieving the above object includes a rack case for accommodating the battery pack, and the battery pack.
[39]
Moreover, the power storage device according to the present invention for achieving the above object includes at least two or more of the battery rack.
Effects of the Invention
[40]
According to one aspect of the present invention, in the battery pack of the present invention, when the internal gas of the battery module rises above a predetermined temperature, some internal configuration is deformed by the internal gas whose temperature has risen, and an extinguishing valve that opens the outlet By providing the fire extinguishing unit, even if thermal runaway or fire occurs in some battery modules of the battery pack, the fire extinguishing valve can immediately supply the extinguishing agent to the inside of the battery module under the influence of the elevated temperature due to thermal runaway. In addition, at this time, even if the battery management system is not operated or malfunctions, stable fire extinguishing can be made by the fire extinguishing valve without BMS control, so that the safety of the battery pack can be effectively increased.
[41]
In addition, according to one aspect of the present invention, the fire extinguishing valve of the present invention is configured to close the outlet, and at least a portion of the glass bulb is configured to open the outlet by being damaged when exposed to internal gas above a predetermined temperature of the battery module, and from the outlet. By providing the dispersing part configured to disperse the discharged extinguishing agent, it is possible to open the extinguishing valve at a fast response speed due to the high internal temperature of the battery module in which thermal runaway or fire has occurred. Moreover, by evenly spraying the extinguishing agent supplied to the dispersion unit, it is possible to effectively increase the extinguishing ability.
[42]
Moreover, according to one aspect of one embodiment of the present invention, at least a part of the fire extinguishing valve of the present invention is located at a part of the supply or discharge part, so that it is easy to contact the hot gas pushed in by the external air introduced by the blower, It can display the thermal runaway of the battery module or the ability to quickly extinguish fire. Accordingly, the safety of the battery pack can be effectively improved.
[43]
Further, according to one aspect of the present invention, according to the present invention, the fire extinguishing valve is located at the middle of the supply part of the gas passage and is inserted into the module housing from one side in the left and right direction of the battery module, so that the fire extinguishing valve releases the extinguishing agent through the dispersing part. It can be sprayed so that it spreads in the front-rear direction. By evenly spraying the extinguishing agent in this way, the cell assembly can effectively prevent thermal runaway or flame propagation.
[44]
In addition, according to one aspect of the present invention, the battery module of the present invention includes a guide block having an inclined surface for guiding the gas generated from the cell assembly to flow facing the exposed portion of the glass bulb, so that the glass of the fire extinguishing valve is provided. The influence of preventing the bulb from coming into contact with the hot gas generated by the connection part can be effectively reduced. Accordingly, the fire extinguishing valve can operate reliably, and the operation time can be effectively reduced.
Brief description of the drawing
[45]
The following drawings attached to this specification illustrate preferred embodiments of the present invention, and serve to further understand the technical spirit of the present invention together with the detailed description of the present invention to be described later, so that the present invention is a matter described in those drawings should not be construed as being limited to
[46]
1 is a front perspective view schematically showing a battery pack according to an embodiment of the present invention.
[47]
2 is a rear perspective view schematically illustrating a battery pack according to an embodiment of the present invention.
[48]
3 is a conceptual diagram schematically illustrating configurations of a battery pack according to an embodiment of the present invention.
[49]
4 is a rear perspective view schematically illustrating a battery module that is a part of a battery pack according to an embodiment of the present invention.
[50]
5 is a perspective view schematically illustrating a cell assembly constituting a battery pack according to an embodiment of the present invention.
[51]
6 is a perspective view schematically illustrating a glass valve that is a part of a battery pack according to an embodiment of the present invention.
[52]
7 is a cross-sectional view schematically showing a cross-sectional view of a glass valve that is a part of a battery pack according to an embodiment of the present invention.
[53]
8 is a front view schematically showing the arrangement of a glass valve, which is a part of a battery pack according to a comparative example of the present invention.
[54]
9 is a side view schematically illustrating the arrangement of a glass valve that is a part of a battery pack according to an embodiment of the present invention.
[55]
10 is a graph showing an operating time according to the arrangement of a glass valve, which is a part of a battery pack according to an embodiment of the present invention.
[56]
11 is a graph illustrating a reaction time index according to an arrangement of a glass valve, which is a part of a battery pack according to an embodiment of the present invention.
[57]
12 is a rear perspective view schematically illustrating a battery module that is a part of a battery pack according to an embodiment of the present invention.
[58]
13 is a partial perspective view schematically illustrating a part of a battery pack according to an embodiment of the present invention.
[59]
14 is a rear perspective view schematically illustrating a battery module that is a part of a battery pack according to another embodiment of the present invention.
[60]
15 is a cross-sectional view schematically illustrating an internal state of the battery module of FIG. 14 .
[61]
16 is a cross-sectional view schematically illustrating an internal appearance of a battery module that is a part of a battery pack according to another embodiment of the present invention.
[62]
17 is a cross-sectional view schematically showing an internal view of a battery module, which is a part of a battery pack, according to another embodiment of the present invention.
[63]
18 is a plan view schematically illustrating a state of a fire extinguishing valve that is a part of a battery pack according to another embodiment of the present invention.
[64]
19 is a plan view schematically illustrating a state of a fire extinguishing valve that is a part of a battery pack according to another embodiment of the present invention.
[65]
20 is a front view schematically illustrating a power storage device according to an embodiment of the present invention.
Modes for carrying out the invention
[66]
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms or words used in the present specification and claims should not be construed as being limited to their ordinary or dictionary meanings, and the inventor should properly understand the concept of the term in order to best describe his invention. Based on the principle that it can be defined, it should be interpreted as meaning and concept consistent with the technical idea of ​​the present invention.
[67]
Accordingly, the configuration shown in the embodiments and drawings described in the present specification is only the most preferred embodiment of the present invention and does not represent all of the technical idea of ​​the present invention, so at the time of the present application, various It should be understood that there may be equivalents and variations.
[68]
[69]
1 is a front perspective view schematically showing a battery pack according to an embodiment of the present invention. 2 is a rear perspective view schematically illustrating a battery pack according to an embodiment of the present invention. And, FIG. 3 is a conceptual diagram schematically illustrating configurations of a battery pack according to an embodiment of the present invention.
[70]
1 to 3 , a battery pack 400 according to an embodiment of the present invention includes at least one battery module 200 arranged in one direction, and a fire extinguishing unit configured to extinguish the battery module 200 . (300). In this case, the battery module 200 may include at least one cell assembly ( 100 in FIG. 5 ).
[71]
Specifically, the fire extinguishing unit 300 may include a fire extinguishing tank 320 , a pipe 330 , and a fire extinguishing valve 310 .
[72]
First, the fire extinguishing tank 320 may contain a fire extinguishing agent (not shown) therein. For example, the extinguishing agent may be a concentrated solution of an inorganic salt such as potassium carbonate, chemical foam, air foam, carbon dioxide, or water. In addition, the fire extinguishing tank 320 may have a compressed gas therein in order to spray the fire extinguishing agent at an appropriate pressure or move it along the pipe 330 .
[73]
For example, the capacity of the fire extinguishing tank 320 may be 59 L, the compressed gas may be 8 bar nitrogen, and the extinguishing agent may be 40 L of water. Here, when water is used as a fire extinguishing agent, when sprayed inside the battery module 200, there is a heat-blocking action along with a fire-extinguishing cooling effect. It is effective in preventing thermal propagation. For this reason, it is possible to effectively prevent a fire or thermal runaway from propagating between the plurality of battery modules 200 .
[74]
The pipe 330 may be configured to be connected to supply the extinguishing agent from the fire fighting tank 320 to each of the at least two battery modules 200 . For example, the pipe 330 may be made of a material that is not corroded by water. For example, the pipe 330 may be made of stainless steel. The pipe 330 may be configured such that one end is connected to the discharge port 321 of the fire extinguishing tank 320 . The other end of the pipe 330 may have a shape extending to the inside of each of the at least two or more battery modules 200 .
[75]
For example, the pipe 330 may include a common pipe 333 connected to a discharge port 321 through which the extinguishing agent of the fire fighting tank 320 is discharged, and the at least two battery modules 200 from the common pipe 333 . ) may be provided with a distribution pipe 336 of a distributed structure to be connected to each. For example, as shown in FIG. 2 , the pipe 330 includes one common pipe 333 connected to the discharge port 321 of the fire extinguishing tank 320 , and 8 branched from the common pipe 333 . It may be provided with two distribution pipes (336). In addition, the eight distribution pipes 336 may be configured to be connected to the eight battery modules 200 .
[76]
Furthermore, the fire extinguishing valve 310 is configured to allow the fire extinguishing agent from the fire extinguishing tank 320 to flow into the battery module 200 when the internal gas (air) of the battery module 200 rises above a predetermined temperature. may be configured to be supplied. That is, the fire extinguishing valve 310 may include a passive valve (not shown) configured to open an outlet so that the extinguishing agent can be injected into the battery module 200 having a predetermined temperature or higher. For example, when the internal temperature of the battery module 200 is greater than or equal to a predetermined temperature, the passive valve may be configured such that the outlet is opened by deforming some configuration. In addition, the passive valve may be configured such that the outlet is opened as a part of the internal configuration is deformed by the heat of the internal gas having the temperature increased. Here, the 'predetermined temperature' may be, for example, 100 degrees Celsius or more.
[77]
Therefore, according to this configuration of the present invention, in the battery pack of the present invention, when the internal gas of the battery module 200 rises above a predetermined temperature, some internal configuration is deformed by the internal gas having the temperature increased. By providing the fire extinguishing unit 300 having the fire extinguishing valve 310 with an open outlet, even if thermal runaway or fire occurs in some battery modules 200 of the battery pack, it is affected by the elevated temperature due to thermal runaway. , the fire extinguishing valve 310 may immediately supply the fire extinguishing agent into the battery module 200 . Also, at this time, even if the battery management system malfunctions, stable fire extinguishing against thermal runaway or fire can be achieved by the fire extinguishing valve without BMS control, thereby effectively enhancing the safety of the battery pack.
[78]
Furthermore, according to the present invention, when thermal runaway or fire occurs in some of the plurality of battery modules 200 , only the fire extinguishing valve 310 is opened in some of the battery modules 200 , and the extinguishing agent can be individually injected. For this reason, compared to the case where the extinguishing agent is put into the entire battery module 200 , a large amount of the extinguishing agent can be put into the battery module 200 more quickly. Moreover, since the extinguishing agent can be directly sprayed into the inside of the battery module 200 rather than the outside, it can effectively extinguish and cool the fire in the battery module 200 in which thermal runaway has occurred, so that the fire can be quickly extinguished. .
[79]
In addition to the passive valve, the fire extinguishing valve 310 may further include an active valve 343 capable of receiving a signal from the fire extinguishing unit 300 to control the opening and closing of the valve. More specifically, the active valve 343 may be a control valve, an electric valve, a solenoid valve, or a pneumatic valve.
[80]
Moreover, the active valve 343 may be configured to supply the extinguishing agent from the extinguishing tank 320 to the battery module 200 whose internal temperature is raised to a predetermined temperature or higher. The active valve 343 may be configured such that, when the internal temperature of the battery module 200 is greater than or equal to a predetermined temperature, the control unit 350 detects this and actively opens it by the control unit 350 . In this case, the control unit 350 may be located on the uppermost battery module 200 among the plurality of battery modules 200 .
[81]
The fire extinguishing unit 300 may include a control unit 350 . Specifically, the control unit 350 may be configured to open the active valve 343 when a temperature above a predetermined temperature is sensed by the temperature sensor 360 . For example, the control unit 350 may be configured to transmit a signal for controlling the active valve 343 . For example, the temperature sensor 360 may be a linear temperature sensor.
[82]
For example, the linear temperature sensor 360 may be configured to melt and cause a short circuit of the two wires when the heat-sensing material coated on the two wires reaches a temperature higher than the reference temperature, thereby generating a fire or overheating signal. have. For example, the heat-sensing material may be a thermoplastic resin that is melted at 70 degrees Celsius or more to 100 degrees Celsius. For example, the thermoplastic resin may be a polyester resin or an acrylic resin. Additionally, the linear temperature sensing sensor 360 may further include an insulating coating material configured to surround the thermal sensing material. The coating material may include polyvinyl chloride.
[83]
In addition, the linear temperature sensor 360 may have a linearly extending structure along at least two or more battery modules 200 arranged in one direction. For example, as shown in FIG. 2 , the battery pack 400 may include the eight battery modules 200 arranged in the vertical direction. The linear temperature sensor 360 is configured such that one end is connected to the controller 350, extends along the eight battery modules 200 arranged in the vertical direction, and the other end is connected to the resistor 365 at the end. can be In this case, a bracket (not shown) and a fixing buckle (not shown) may be used to partially fix the position of the linear temperature sensor 360 .
[84]
Therefore, according to this configuration of the present invention, the battery pack 400, by having the temperature sensor 360 linearly extended along at least two or more battery modules 200, it is possible to reduce the manufacturing cost of the battery pack. .
[85]
That is, when a plurality of temperature sensors are applied in the prior art, a plurality of temperature sensors and a separate signal wire for connecting the plurality of temperature sensors are required. it became In contrast, the battery pack 400 of the present invention uses only one linear temperature sensor 360 to detect the temperature of a plurality of battery modules 200, and a separate signal wire is unnecessary, and is lightweight and flexible. Since the installation is easy, the manufacturing cost of the battery pack 400 can be greatly reduced.
[86]
Moreover, the linear temperature sensor 360 is easy to set multiple points for more accurate temperature sensing even in one battery module 200 . Accordingly, the present invention can greatly reduce the failure rate for detecting the occurrence of fire in the battery module 200 .
[87]
In addition, the fire extinguishing unit 300 may further include a smoke detection sensor 380 that detects smoke emitted from the at least two battery modules 200 . Specifically, the smoke detection sensor 380 may be located at the uppermost portion of the at least two or more battery modules 200 stacked in the vertical direction. That is, when a fire occurs in the battery module 200 , the generated gas may be moved upward, and thus, it is preferable to be positioned at the top of the at least two or more battery modules 200 .
[88]
In addition, when the smoke detection sensor 380 detects smoke, the control unit 350 of the fire extinguishing unit 300 may be configured to transmit a signal. The control unit 350 may open the active valve 343 according to the received signal.
[89]
4 is a rear perspective view schematically illustrating a battery module that is a part of a battery pack according to an embodiment of the present invention. And, FIG. 5 is a perspective view schematically illustrating a cell assembly that is a component of a battery pack according to an embodiment of the present invention.
[90]
4 and 5 , the battery module 200 may include at least one cell assembly 100 . The cell assembly 100 may have a plurality of secondary batteries 110 arranged in one direction. Here, it may have one cell unit of the secondary battery 100 .
[91]
The secondary battery 110 may be a pouch-type secondary battery 110 . For example, as shown in FIG. 5 , when viewed in the F direction (from the front) of FIG. 1 , the cell assembly 100 includes a plurality of pouch-type secondary batteries 110 stacked side by side in the front and rear directions. may be of the form. For example, as shown in FIG. 5 , one cell assembly 100 may include 21 pouch-type secondary batteries 110 .
[92]
Meanwhile, in the present specification, unless otherwise specified, with respect to the up, down, front, back, left, and right directions, when viewed in the F direction of FIG. 1 is based.
[93]
In particular, the pouch-type secondary battery 110 may include an electrode assembly (not shown), an electrolyte (not shown), and a pouch 116 .
[94]
Furthermore, the positive lead 111 and the negative lead 112 may be formed at left and right ends in opposite directions with respect to the center of the secondary battery 110 . That is, the positive lead 111 may be provided at one end (right end) with respect to the center of the secondary battery 110 . In addition, the negative lead 112 may be provided at the other end (left end) with respect to the center of the secondary battery 110 .
[95]
However, the battery module 200 according to the present invention is not limited to the pouch-type secondary battery 110 described above, and various secondary batteries 110 known at the time of filing of the present invention may be employed.
[96]
Meanwhile, referring back to FIG. 4 , the battery module 200 may further include a bus bar assembly 270 . Specifically, the bus bar assembly 270 includes at least one bus bar 272 configured to electrically interconnect the plurality of secondary batteries 110 and configured to mount the at least one bus bar 272 to the outside. At least two or more bus bar frames 276 may be provided. The at least two bus bar frames 276 may be provided on both sides of the cell assembly 100 in the left and right directions.
[97]
Meanwhile, the module housing 210 may have an internal space to accommodate the cell assembly 100 therein. Specifically, when viewed in the direction F of FIG. 1 , the module housing 210 may include an upper cover 220 , a base plate 240 , a front cover 260 , and a rear cover 250 . .
[98]
Specifically, the base plate 240 may have an area larger than the size of the bottom surface of the at least two cell assemblies 100 so as to mount the at least two or more cell assemblies 100 thereon. The base plate 240 may have a plate shape extending in a horizontal direction.
[99]
In addition, the upper cover 220 may include an upper wall 224 and a sidewall 226 extending downward from the upper wall 224 . The upper wall 224 may have a plate shape extending in a horizontal direction to cover an upper portion of the cell assembly 100 . The side wall 226 may have a plate shape extending downward from both ends of the upper wall 224 in the left and right directions to cover both sides of the cell assembly 100 in the left and right directions.
[100]
In addition, the sidewall 226 may be coupled to a portion of the base plate 240 . For example, as shown in FIG. 5 , the upper cover 220 may include an upper wall 224 having a plate shape extending in front, rear, left and right directions. The upper cover 220 may include two sidewalls 226 extending downward from both ends of the upper wall 224 in the left and right directions. Furthermore, the lower ends of each of the two sidewalls 226 may be configured to be coupled to both ends of the base plate 240 in the left and right directions. In this case, the coupling method may be a male-female coupling method or a welding coupling method.
[101]
Moreover, the front cover 260 may be configured to cover the front of the plurality of secondary batteries 110 . For example, the front cover 260 may have a plate having a size larger than the size of the front surfaces of the plurality of secondary batteries 110 . The plate may be erected in an up-down direction.
[102]
In addition, the rear cover 250 may be configured to cover the rear of the cell assembly 100 . For example, the rear cover 250 may have a plate shape having a size larger than that of the rear surfaces of the plurality of secondary batteries 110 .
[103]
6 is a perspective view schematically illustrating a fire extinguishing valve that is a part of a battery pack according to an embodiment of the present invention. And, FIG. 7 is a cross-sectional view schematically showing a cross-sectional view of a fire extinguishing valve that is a part of a battery pack according to an embodiment of the present invention.
[104]
6 and 7 , in the fire extinguishing valve 310 , the upper end of the top part 315 may be connected to the distribution pipe 336 . In addition, the fire extinguishing valve 310 is normally configured to seal the outlet 315a of the fire extinguishing valve 310, but when exposed to the internal gas above a predetermined temperature of the battery module 200, at least a portion is damaged and the outlet and a glass bulb 312 configured to open 315a. In addition, the glass bulb 312 may include a predetermined liquid (not shown) accommodated therein. For example, the liquid may have a property of increasing in volume as the temperature increases. The glass bulb 312 may be configured to seal a passage (outlet) through which the fluid of the fire extinguishing valve 310 flows.
[105]
In addition, the glass bulb 312 may be configured to be broken by volume expansion of the predetermined liquid at a predetermined temperature, for example, 70 degrees Celsius to 100 degrees Celsius or more. For example, the liquid may be water. That is, when the fire extinguishing valve 310 is located inside the battery module 200, when the internal temperature of the battery module 200 rises above a predetermined temperature, the fire extinguishing agent of the fire extinguishing valve 310 flows. At least a part of the glass bulb 312 that has been blocking the 347c may be broken, so that the outlet 315a of the fire extinguishing valve 310 may be opened. Furthermore, the fire extinguishing valve 310 may further include a dispersing part 317 configured to disperse the extinguishing agent discharged from the outlet 315a in all directions. The dispersing part 317 may be configured to disperse the extinguishing agent discharged from the outlet 315a.
[106]
More specifically, the fire extinguishing valve 310 may include a top portion 315 , a connection portion 316 , and a dispersing protrusion 317a.
[107]
The top portion 315 may have a tubular shape in which the outlet 315a of the valve is formed and the outlet 315a is closed by one end of the glass bulb 312 . In this case, the tubular shape may have a shape in which the tube diameter is continuously narrowed in the direction in which the glass bulb 312 is located.
[108]
The connection part 316 extends from the top part 315 to the side of the glass bulb 312 to cover the glass bulb 312 and from the top part 315 to fix the other end of the glass bulb 312 . The two arms 316a extend in one direction and may have a form that is gathered in the center again. At this time, the other end of the glass bulb 312 may be located in the portion where the two arms of the connection part 316 are gathered.
[109]
The dispersing protrusion 317a may be divided into a plurality of dispersing protrusions 317a at regular intervals in a horizontal direction from the end of the body of the dispersing unit 317 so that the extinguishing material discharged from the outlet 315a is dispersed and extended.
[110]
Therefore, according to this configuration of the present invention, the fire extinguishing valve 310 of the present invention is configured to close the outlet 315a, and when exposed to internal gas above a predetermined temperature of the battery module 200, at least a portion is damaged. By having a glass bulb 312 configured to open the outlet 315a, and a dispersing unit 317 configured to disperse the extinguishing agent discharged from the outlet 315a, the battery module 200 in which the thermal runaway or fire has occurred ), it is possible to open the fire extinguishing valve 310 at a fast response speed by the high internal temperature of the. Moreover, by evenly spraying the extinguishing agent supplied to the dispersing unit 317, it is possible to effectively increase the extinguishing ability.
[111]
8 is a front view schematically illustrating the arrangement of a fire extinguishing valve that is a part of a battery pack according to a comparative example of the present invention. And, FIG. 9 is a side view schematically illustrating the arrangement of a fire extinguishing valve that is a part of a battery pack according to an embodiment of the present invention.
[112]
8 and 9 , the glass bulb 312 provided in the fire extinguishing valve 310 of the present invention may be configured to be exposed to high-temperature gas due to thermal runaway or fire of the cell assembly 100. have. For example, the glass bulb 312 may be configured to face the hot gas. Moreover, the connection part 316 may be rotatably disposed so that the glass bulb 312 does not block the flow of the hot gas by the connection part 316 (arm part) of the fire extinguishing valve 310 .
[113]
For example, as shown in FIG. 8 , in the fire extinguishing valve 310 according to a comparative example of the present invention, the fire extinguishing valve 310 is based on a direction in which the glass bulb 312 and the high temperature gas face each other. ) of the arm portion 316a of the connecting portion 316 may be positioned so that an angle formed with the glass bulb 312 is 0 degrees. That is, when the glass bulb 312 faces the high-temperature gas from the front, the arm portion 316a of the connection part 316 is positioned on the front.
[114]
For example, as shown in FIG. 9 , in the fire extinguishing valve 310 according to an embodiment of the present invention, the connection part 316 is based on a direction in which the glass bulb 312 and the high temperature gas face each other. The arm portion 316a of the glass bulb 312 and the angle formed by 90 degrees may be positioned. That is, when the glass bulb 312 faces the high-temperature gas from the front, the arm portion 316a of the connection part 316 is located on the side surface.
[115]
10 is a graph illustrating an operation time according to an arrangement of a fire extinguishing valve, which is a part of a battery pack according to an embodiment of the present invention.
[116]
Referring to FIG. 10 together with FIGS. 8 and 9 , like the fire extinguishing valve 310 of FIG. 8 , the fire extinguishing valve 310 is based on a direction in which the glass bulb 312 and the high temperature gas G face each other. ), when the arm portion 316a of the connection part 316 is positioned so that the angle formed with the glass bulb 312 is 0 degrees, the operation time of the fire extinguishing valve 310 is longest. That is, it takes the longest time for the fire extinguishing valve 310 arranged like the fire extinguishing valve 310 of FIG. 8 to open.
[117]
Conversely, like the fire extinguishing valve 310 of FIG. 9 , the arm portion 316a of the connection part 316 of the fire extinguishing valve 310 is based on the direction in which the glass bulb 312 and the high temperature gas G face each other. ) is positioned so that the angle formed with the glass bulb 312 is 90 degrees, the operation time of the fire extinguishing valve 310 is the shortest. That is, the time required for the fire extinguishing valve 310 arranged like the fire extinguishing valve 310 of FIG. 9 to open was the shortest. Preferably, the angle of the arm portion 316a of the connection part 316 of the fire extinguishing valve 310 is 60 to 90 degrees based on the direction in which the glass bulb 312 and the high-temperature gas G face each other. desirable.
[118]
In this way, like the fire extinguishing valve 310 according to an embodiment of the present invention, the arm portion 316a of the connection part 316 prevents interference when the glass bulb 312 faces the high temperature gas (G). Disposing so as not to cause the fire extinguishing valve 310 can be opened the fastest. Accordingly, according to the present invention, in case of thermal runaway or fire of the battery module 200, the fire extinguishing valve 310 can be used to quickly extinguish and suppress the fire.
[119]
11 is a graph illustrating a reaction time index according to an arrangement of a fire extinguishing valve, which is a part of a battery pack according to an embodiment of the present invention.
[120]
Referring to FIG. 11 together with FIGS. 8 and 9 , like the fire extinguishing valve 310 of FIG. 8 , the connection part of the fire extinguishing valve 310 is based on a direction in which the glass bulb 312 and the high temperature gas face each other. When the arm portion 316a of 316 is positioned so that the angle formed with the glass bulb 312 is 0 degrees, the reaction time index of the fire extinguishing valve 310 is the longest. That is, it took the longest time for the fire extinguishing valve 310 to open. Here, the 'reaction time index' is a measure of how quickly the fire extinguishing valve reaches the opening temperature according to heat transfer.
[121]
Conversely, like the fire extinguishing valve 310 of FIG. 9 , the arm portion 316a of the connection part 316 of the fire extinguishing valve 310 is based on the direction in which the glass bulb 312 and the high temperature gas G face each other. ) is positioned so that the angle formed with the glass bulb 312 is 90 degrees, the reaction time index of the fire extinguishing valve 310 is the shortest. That is, the time taken for the fire extinguishing valve 310 to open was the shortest.
[122]
In this way, like the fire extinguishing valve 310 according to an embodiment of the present invention, the arm portion 316a of the connection part 316 prevents the glass bulb 312 from interfering with the high temperature gas (G). Disposing so as not to cause the fire extinguishing valve 310 can be opened the fastest. Accordingly, according to the present invention, in case of thermal runaway or fire of the battery module 200, the fire extinguishing valve 310 can be used to quickly extinguish and suppress the fire.
[123]
12 is a rear perspective view schematically illustrating a battery module that is a part of a battery pack according to an embodiment of the present invention.
[124]
Referring back to FIG. 12 together with FIG. 4 , the module housing 210 is located inside the module housing 210 and includes a gas passage 211 configured to discharge the gas generated from the cell assembly 100 to the outside. can be That is, the module housing 210 may include a gas passage 211 through which the gas generated from the cell assembly 100 flows. Here, the gas passage 211 may be a space elongated in the front-rear direction to communicate with the outside. The gas passage 211 may be provided on one side or both sides of the cell assembly 100 in the left and right direction.
[125]
More specifically, the gas passage 211 may be a space between the upper or lower portion of the cell assembly 100 and the module housing 210 . That is, the gas generated in the cell assembly 100 accommodated in the battery module 200 moves to the left and right sides of the cell assembly 100 through the gas passage 211c located above or below the cell assembly 100 . It moves to both sides of the direction, and again, formed at the end of the gas passage 211b and may be discharged through a plurality of gas outlets 212 perforated to communicate with the outside of the battery module 200 .
[126]
The rear cover 250 located at the rear of each of the at least two or more battery modules 200 may be provided with an inlet 264 configured to input the extinguishing agent. The inlet 264 may be positioned to communicate with the gas passage 211 . That is, the inlet 264 may be configured to communicate with the gas passages 211 located on both sides of the cell assembly 100 in the left and right directions.
[127]
For example, the fire extinguishing valve 310 is inserted into the inlet 264 and positioned at a portion of the gas passage 211 so that the glass bulb 312 is exposed to the gas generated from the cell assembly 100 . can be
[128]
That is, since the inlet 264 communicates with the gas passage 211 , the inlet 264 is exposed so that the glass bulb 312 of the fire extinguishing valve 310 is exposed to the gas generated from the cell assembly 100 . can be inserted into
[129]
Accordingly, according to this configuration of the present invention, in the present invention, at least a portion of the fire extinguishing valve 310 is exposed to the gas passage 211 such that the glass bulb 312 is exposed to the gas generated from the cell assembly 100 . ), the cell assembly 100 can effectively receive heat transfer from the high-temperature air or gas moving along the gas passage 211 when thermal runaway or fire occurs, so that the fire extinguishing valve 310 ) of the glass bulb 312 bursts quickly, so a quick fire extinguishing response can be made.
[130]
Referring back to FIG. 12 together with FIG. 1 , the battery module 200 may include a blower 370 and a gas outlet 212 . The blower 370 is mounted on the front end of the module housing 210 when viewed in the direction F of FIG. 1 , and external air may be introduced into the module housing 210 . The blower 370 may include a blowing fan configured to rotate by receiving power.
[131]
In addition, the gas outlet 212 may have a plurality of openings connected to the gas passage 211 and perforated so that the inside and the outside flow. When viewed in the direction F of FIG. 1 , the gas outlet 212 may be formed at the rear end of the module housing 210 . For example, a gas outlet 212 may be provided on the rear cover of the module housing 210 .
[132]
Furthermore, the gas passage 211 may include a supply part 211a and an exhaust part 211b. Specifically, the supply unit 211a may be located at one side of the cell assembly 100 in the left and right direction. For example, the supply part 211a may be located on the left side of the cell assembly 100 when viewed in the F direction of FIG. 1 . The supply unit 211a may be configured such that the external air injected by the blower 370 moves to the rear end of the module housing 210 . That is, the blower 370 may be configured to push the internal gas of the battery module 200 to the rear end of the supply unit 211a by introducing external air.
[133]
In addition, the discharge part 211b may be located on the other side of the cell assembly 100 in the left and right direction. For example, the discharge part 211b may be located on the right side of the cell assembly 100 when viewed in the direction F of FIG. 12 . The discharge part 211b may be configured such that the external air introduced by the blower 370 moves to the gas outlet 212 . That is, the discharge part 211b may be configured to communicate with the gas discharge port 212 .
[134]
13 is a partial perspective view schematically illustrating some components of a battery pack according to an embodiment of the present invention. Here, FIG. 13 shows only the common pipe, the distribution pipe, and the fire extinguishing valve 310 provided at the distal end of the distribution pipe.
[135]
Referring to FIG. 13 together with FIG. 12 , in the fire extinguishing valve 310 , a glass bulb 312 , which is an internal configuration, is located in a part of the supply part 211a or the discharge part 211b inside the battery module 200 . can be For example, as shown in FIG. 13 , the fire extinguishing valve 310 may be disposed to protrude toward the inside of the battery module 200 . At least a portion of the fire extinguishing valve 310 may be inserted into the module housing 210 from the rear of the battery module 200 . For example, as shown in FIG. 13 , when viewed in the F direction of FIG. 12 , the glass bulb 312 and the dispersion part 317 of the fire extinguishing valve 310 are connected to the supply part ( 211a) may be inserted through the inlet 264 to be positioned at the rear end.
[136]
That is, the high-temperature gas generated inside the battery module 200 is transferred to the fire extinguishing valve 310 located at the rear end of the supply unit 211a of the gas passage 211 by the external air injected by the blower 370 . may be configured to move. Accordingly, the glass bulb 312 of the fire extinguishing valve 310 may come into contact with the pushed high-temperature gas to quickly open the valve.
[137]
Furthermore, the fire extinguishing valve 310 inserted into the module housing 210 is a glass bulb by the high-temperature gas generated inside when the cell assembly 100 of the battery module 200 is thermally runaway or a fire occurs. 312 may break and open the outlet. At this time, the extinguishing agent supplied to the rear end of the supply unit 211a moves forward of the supply unit 211a, and a portion passes through the cell assembly 100 and moves to the discharge unit 211b.
[138]
Therefore, according to this configuration of the present invention, at least a part of the fire extinguishing valve 310 of the present invention is located in a part of the supply part 211a or the discharge part 211b, so that the external air injected by the blower 370 is provided. Because of this, it is easy to come into contact with the rushing in high-temperature gas, and thus, thermal runaway of the battery module 200 or rapid fire extinguishing ability can be exhibited. Accordingly, the safety of the battery pack can be effectively improved.
[139]
14 is a rear perspective view schematically illustrating a battery module that is a part of a battery pack according to another embodiment of the present invention. And, FIG. 15 is a cross-sectional view schematically showing an internal state of the battery module of FIG. 14 .
[140]
Referring to FIGS. 14 and 15 together with FIG. 6 , in another battery module 200A according to another embodiment of the present invention, unlike the battery module 200 shown in FIG. 12 , the inlet 264 is viewed in the F direction. When viewed, it may be located on the left side of the module housing 210 . For example, as shown in FIG. 14 , an inlet 264 may be provided on the side wall ( FIGS. 4 and 226 ) of the upper cover ( FIGS. 4 and 220 ) of the module housing 210 . Also, the inlet 264 may be located at the center of the sidewall 226 of the upper cover 220 in the front-rear direction.
[141]
In addition, in the fire extinguishing valve 310 , the glass bulb 312 may be located at the stop of the supply part ( 211a of FIG. 12 ) of the gas passage 211 . The glass bulb 312 of the fire extinguishing valve 310 may be inserted into the module housing 210 from one side in the left and right direction of the battery module 200A. For example, as shown in FIG. 15 , the fire extinguishing valve 310 is inserted through an inlet 264 provided on the side of the module housing 210 , and the supply part of the gas passage 211 ( FIG. 12, it may be located in the middle of the front-rear direction of 211a).
[142]
Accordingly, according to this configuration of the present invention, the fire extinguishing valve 310 is located at the middle of the supply portion 211a of the gas passage 211 and is located at one side of the battery module 200A in the left and right direction of the module housing 210 ), the extinguishing agent can be sprayed to spread in the front-rear direction through the dispersing part 317 of the extinguishing valve 310 . By evenly spraying the extinguishing agent in this way, the cell assembly 100 can effectively prevent thermal runaway or flame propagation.
[143]
Moreover, the glass bulb 312 of the fire extinguishing valve 310 inserted from one side in the left and right direction can contact the high-temperature gas G flowing along the supply part 211a of the gas passage 211 without any interference. , it is possible to effectively reduce the reaction operation time of the fire extinguishing valve 310 . Accordingly, the battery pack of the present invention can exhibit fast extinguishing ability.
[144]
16 is a cross-sectional view schematically illustrating an internal appearance of a battery module that is a part of a battery pack according to another embodiment of the present invention.
[145]
Referring to FIG. 16 together with FIG. 6 , the battery module 200B of the battery pack according to another embodiment may further include a guide block 382 inside the module housing 210 . The guide block 382 may have an inclined surface 382a that guides the gas G generated from the cell assembly 100 to face the exposed portion of the glass bulb 312 and flow. For example, the guide block 382 may have a triangular shape in plan view. For example, as shown in FIG. 16 , the high-temperature gas G flowing from the front to the rear of the supply part 211a of the gas passage 211 flows along the inclined surface 382a of the guide block 382 while flowing A flow of gas G may be induced in a direction in which the glass bulb 312 of the fire extinguishing valve 310 is located.
[146]
Accordingly, according to this configuration of the present invention, the battery module 200B has an inclined surface ( By providing the guide block 382 with 382a), it is possible to effectively reduce the obstruction of the glass bulb 312 of the fire extinguishing valve 310 from contacting the hot gas G by the connection portion 316 . Accordingly, the fire extinguishing valve 310 can operate reliably, and the operation time can be effectively reduced.
[147]
17 is a cross-sectional view schematically showing an internal view of a battery module, which is a part of a battery pack, according to another embodiment of the present invention.
[148]
Referring to FIG. 17 together with FIG. 6 , in the battery module 200C according to another embodiment of the present invention, when compared with the battery module 200 of FIG. 12 , the pipe diameter is in the direction in which the gas G is introduced. A gradually decreasing tube member 384 may be further provided on the gas passage 211 . The tube member 384 may be configured to induce the gas G generated from the cell assembly 100 to be collected at the exposed portion of the glass bulb 312 . At this time, the fire extinguishing valve 310 is located at the middle of the supply part 211a of the gas passage 211 and can be inserted into the module housing 210 from one side in the left and right direction of the battery module 200C. .
[149]
For example, as shown in FIG. 17 , inside the battery module 200C, the glass bulb 312 of the fire extinguishing valve 310 located at the center of the supply part 211a of the gas passage 211 in the front-rear direction and A tube member 384 may be provided at an adjacent position. The pipe member 384 collects the high-temperature gas (G) moving from the front end to the rear end of the supply unit 211a in the direction in which the glass bulb 312 provided of the fire extinguishing valve 310 is located. It may have a shape in which the diameter of the tube is gradually reduced in the direction of
[150]
Therefore, according to this configuration of the present invention, the pipe diameter in the direction in which the gas (G) is introduced so as to induce the gas (G) generated from the cell assembly 100 to be collected at the exposed portion of the glass bulb (312). By having a progressively decreasing tube member 384 , the gas G generated from the cell assembly 100 is effectively collected into the glass bulb 312 of the fire extinguishing valve 310 , so that the glass bulb 312 is rapidly discharged. It can be raised to high temperature. Accordingly, the fire extinguishing valve 310 can operate reliably, and the operation time can be effectively reduced.
[151]
18 is a plan view schematically illustrating a state of a fire extinguishing valve that is a part of a battery pack according to another embodiment of the present invention.
[152]
Referring to FIG. 18 , the fire extinguishing valve 310A of the battery pack according to another embodiment of the present invention may further include a gas guide band 318 when compared to the fire extinguishing valve 310 shown in FIG. 6 . have.
[153]
That is, the fire extinguishing valve 310A shown in FIG. 18 is the same as the fire extinguishing valve 310 shown in FIG. 6 except for the configuration of the gas guide 318 . Accordingly, in the following description, the top part 315 , the connection part 316 , and the dispersion part 317 previously described above will not be described in detail.
[154]
In addition, the gas guide zone 318 may be configured such that a larger amount of the high-temperature gas G is in contact with the glass bulb 312 . The gas guide band 318 may have a shape extending from the top part 315 in a direction in which the dispersion part 317 is located. The gas guide band 318 may have a structure that is spread in at least two or more directions among left and right vertical directions. For example, as shown in FIG. 18 , the gas guide band 318 may extend from each of the left and right sides of the top part 315 in a direction in which the distribution protrusion 317a is located. The gas guide band 318 may have a structure extending from the top part 315 in the left and right vertical directions.
[155]
Therefore, according to this configuration of the present invention, the dispersion part 314A of the fire extinguishing valve 310 of the present invention extends from the top part 315 in the direction in which the dispersion part 317 is located, and at least two or more of the left and right vertical directions. By providing the gas guide band 318 having a structure that is widened in the direction, the high-temperature gas (G) flowing to both sides of the glass bulb 312 does not pass straight through, and the flow is guided in the direction in which the glass bulb 312 is located. can Accordingly, the reliability of the operation of the fire extinguishing valve 310 can be increased, and the operation time of the fire extinguishing valve 310 can be effectively reduced.
[156]
19 is a plan view schematically illustrating a state of a fire extinguishing valve that is a part of a battery pack according to another embodiment of the present invention.
[157]
Referring to FIG. 19 , the fire extinguishing valve 310B of the battery pack according to another embodiment of the present invention is a gas guide band ( 318B) may be provided. In addition, the gas guide band 318B may be provided to extend obliquely in any one of the left and right directions of the top portion 315 body. For example, as shown in FIG. 19 , the gas guide band 318B has a structure inclinedly extending from the right side of the top part 315 to the left, and the dispersing part 317 from an end of the inclined structure. ) may have a structure extending forward where it is located.
[158]
Therefore, according to this configuration of the present invention, the fire extinguishing valve 310B of the present invention is the structure 318a1 inclined in the left or right direction from the top portion 315, and the dispersion from the end of the inclined structure 318a1. By having a gas guide band 318B having a structure 318a2 extending forward in which the portion 317 is located, the high-temperature gas G flowing to one side of the glass bulb 312 does not pass directly through the glass bulb ( 312) to stagnate around the gas flow can be induced. Accordingly, the reliability of the operation of the fire extinguishing valve 310 can be increased, and the operation time of the fire extinguishing valve 310 can be effectively reduced.
[159]
20 is a front view schematically illustrating a power storage device according to an embodiment of the present invention.
[160]
Referring to FIG. 20 , the battery rack 500 according to an embodiment of the present invention may include the battery pack 400 , and a rack case 510 accommodating the battery pack 400 . The rack case 510 may also be configured to accommodate a plurality of battery modules 200 of the battery pack 400 in a vertically stacked form. Inside the rack case 510, the lower surface of the battery module 200 may be mounted in a form parallel to the horizontal plane.
[161]
Here, the horizontal direction may mean a direction parallel to the ground when the battery module 200 is placed on the ground, and may also be referred to as at least one direction on a plane perpendicular to the vertical direction.
[162]
Furthermore, at least one side of the rack case 510 is configured to be openable, and the battery module 200 can be introduced into the internal space through the open side. However, the rack case 510 may be configured such that the open side can be closed.
[163]
In addition, the battery rack 500 may further include other components such as a battery management system (BMS, invisible) inside or outside the rack case 510 .
[164]
On the other hand, again, the power storage device 600 according to an embodiment of the present invention may include at least two or more of the battery rack 500 . The two or more battery racks 500 may be arranged to be arranged in one direction. For example, as shown in FIG. 12 , the power storage device 600 may be configured such that three battery racks 500 are arranged in one direction. In addition, the power storage device 600 may be provided with a separate central control unit (not shown) that can control the charging and discharging of the three battery racks (500).
[165]
[166]
Meanwhile, in this specification, terms indicating directions such as up, down, left, right, front, and back are used, but these terms are for convenience of explanation only, and may vary depending on the location of the object or the position of the observer. It is apparent to those skilled in the art that the present invention may
[167]
As described above, although the present invention has been described with reference to limited embodiments and drawings, the present invention is not limited thereto, and the technical idea of ​​the present invention and the following by those of ordinary skill in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of equivalents of the claims to be described.
[168]
[Explanation of code]
[169]
200: battery module 100: cell assembly
[170]
110: secondary battery 210: module housing
[171]
220, 224, 226: top cover, top wall, side wall
[172]
240, 250, 260: base plate, rear cover, front cover
[173]
270: busbar assembly
[174]
211: gas passage 212: gas outlet
[175]
264: inlet
[176]
300: fire-fighting unit 310: fire-extinguishing valve
[177]
320: extinguishing tank 321: outlet
[178]
330, 333, 336: piping, common piping, distribution piping
[179]
312: glass bulb 317: dispersion unit
[180]
370: blowers 211a, 211b: supply unit, discharge unit
[181]
382: guide block 384: tube member
[182]
315, 316, 317, 318: tower part, connecting part, dispersing part, gas guide belt
[183]
318a1, 318a2: inclined structure, elongated structure
[184]
350: control unit
[185]
400: battery pack 500: battery rack
[186]
510: rack case
[187]
600: power storage device
Industrial Applicability
[188]
The present invention relates to a battery pack. The present invention is also applicable to the large-scale power storage device industry including battery packs.
Claims
[Claim 1]
at least one battery module having a cell assembly having a plurality of secondary batteries arranged in one direction and arranged in one direction; and a fire extinguishing tank in which the extinguishing agent is accommodated, a pipe connected to supply the extinguishing agent from the fire fighting tank to the at least one battery module, and when the internal gas of the battery module rises above a predetermined temperature, the extinguishing agent is discharged from the extinguishing tank and a fire extinguishing unit having a fire extinguishing valve in which an outlet is opened as a part of the internal configuration is deformed by the internal gas whose temperature has risen so that is supplied to the inside of the battery module.
[Claim 2]
According to claim 1, wherein the fire extinguishing valve comprises: a glass bulb configured to close the outlet and open the outlet by at least part of the battery module being damaged when exposed to internal gas above a predetermined temperature; and a dispersing unit configured to disperse the extinguishing agent discharged from the outlet.
[Claim 3]
The method of claim 2, wherein the battery module comprises: a module housing having an internal space for accommodating the cell assembly; and a gas passage located inside the module housing and configured to discharge gas generated from the cell assembly to the outside, wherein the fire extinguishing valve has the glass bulb positioned in a portion of the gas passage.
[Claim 4]
According to claim 3, wherein the battery module, The blower mounted on the front end of the module housing and configured to introduce external air into the module housing; and a gas outlet formed at the rear end of the module housing and connected to the gas passage, wherein the gas passage is located on one side of the cell assembly in the left and right direction and external air introduced by the blower moves to the rear end of the module housing a supply configured to; and a discharge unit located on the other side in the left and right direction of the cell assembly and configured to move the external air introduced by the blower to the gas outlet, wherein at least a part of the fire extinguishing valve is located in the supply unit or a part of the discharge unit battery pack with
[Claim 5]
5. The battery pack according to claim 4, wherein the fire extinguishing valve is located at a rear end of the supply part of the gas passage and at least a portion is inserted into the module housing from the rear of the battery module.
[Claim 6]
The battery pack according to claim 5, wherein the fire extinguishing valve is located at the middle of the supply part of the gas passage and is inserted into the module housing from one side in the left and right direction of the battery module.
[Claim 7]
The battery pack according to claim 5, wherein the battery module includes a guide block having an inclined surface for guiding the gas generated from the cell assembly to flow facing the exposed portion of the glass bulb.
[Claim 8]
According to claim 5, wherein the battery module, the gas generated from the cell assembly is provided with a tube member having a tube diameter gradually decreasing in a direction in which the gas is introduced so as to be collected in the exposed portion of the glass bulb. to the battery pack.
[Claim 9]
According to claim 2, wherein the fire extinguishing valve comprises: a top portion provided with the outlet and configured to close the outlet by the glass bulb; a connection portion extending from the top portion to cover the glass bulb and configured to secure the glass bulb; a plurality of dispersing projections extending from the dispersing part so that the extinguishing material discharged from the outlet is dispersed; and a gas guide belt extending from the top and having a structure spread in at least two or more directions among left, right, up and down directions.
[Claim 10]
The battery rack according to any one of claims 1 to 9, characterized in that it comprises a rack case for accommodating the battery pack, and the battery pack.
[Claim 11]
Power storage device comprising at least two or more battery racks according to claim 10.