One]The present invention relates to a battery module including a base plate having a gas discharge passage, a battery pack, and a power storage device, and more particularly, to a battery module that reduces the risk of secondary ignition or explosion and improves cooling efficiency.
[2]This application is a priority claim application for Korean Patent Application No. 10-2019-0071733 filed on June 17, 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. The self-discharge rate is very low and the energy density is high, attracting attention.
[4]
Such a lithium secondary battery mainly uses 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 an exterior material for sealing and housing the electrode assembly together with an electrolyte, that is, a battery pouch exterior material.
[5]
In recent years, 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-to-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, it is common for such a battery pack to have an external housing made of a metal material to protect the plurality of secondary batteries from external shocks or to store and store the secondary batteries. Meanwhile, demand for high-capacity battery packs is increasing recently.
[8]
However, in a high-capacity battery pack, when any one of a plurality of secondary batteries built in a battery module ignites or explodes, heat or flame is transferred to an adjacent secondary battery to cause a secondary explosion. However, efforts are being made to improve stability.
[9]
Furthermore, since the high-capacity battery pack also increases heat generated during charging and discharging compared to the prior art, it is necessary to apply an effective cooling method. For example, as the cooling method, a method of circulating cooled air in a plurality of secondary batteries to discharge heat to the outside was used.
[10]
However, in a battery module equipped with an air cooling method, when a specific secondary battery among a plurality of secondary batteries is ignited, the flame of the ignited secondary battery is transmitted faster to the adjacent secondary battery along the cooling wind. It was more difficult to secure stability.
[11]
Furthermore, the battery module of the prior art also has the possibility that the flame of the ignited secondary battery can propagate to the adjacent secondary battery through the gas passage formed to discharge the gas, so secondary ignition or explosion can be prevented. development is needed
DETAILED DESCRIPTION OF THE INVENTION
technical challenge
[12]
Accordingly, the present invention has been devised to solve the above problems, and an object of the present invention is to provide a battery module that reduces the risk of secondary ignition or explosion and improves cooling efficiency.
[13]
Other objects and advantages of the present invention may be understood by the following description, and will be more clearly understood by the examples of the present invention. It will also 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
[14]
The battery module according to the present invention for achieving the above object,
[15]
a cell assembly including a plurality of secondary batteries stacked on each other in a front-rear direction; and
[16]
At least one gas discharge passage configured to mount a plurality of secondary batteries of the cell assembly on an upper portion, the sidewall extends in the front and rear directions to communicate with the outside, and an opening part of the sidewall is formed in one direction, and the opening portion is covered and a base plate having at least one flame-retardant mesh sheet configured to do so.
[17]
In addition, the base plate,
[18]
The cell assembly is mounted on the upper portion, is located on one side of the gas discharge passage, and has a refrigerant passage elongated in at least one direction to communicate with the outside, and a refrigerant injection unit for injecting a refrigerant and a refrigerant discharge unit for discharging the refrigerant A cooling member may be provided.
[19]
Furthermore, a thermally conductive pad interposed between the cooling member of the base plate and the plurality of secondary batteries may be included.
[20]
In addition, the thermally conductive pad may be provided with an insertion groove formed at a position corresponding to the plurality of secondary batteries so that a portion of each of the plurality of secondary batteries is inserted.
[21]
Furthermore, a top portion extending in the horizontal direction to cover the upper portion of the cell assembly, and coupled to the base plate and extending downward from both ends of the tower portion in the left and right direction to cover both sides in the left and right direction of the cell assembly an upper cover having a side portion;
[22]
a bus bar assembly including a bus bar configured to be electrically connected to the cell assembly, and a bus bar frame mounted with the bus bar and coupled to the side portion;
[23]
a front cover coupled to the front end of the upper cover and configured to cover the front of the cell assembly; and
[24]
It may further include; a rear cover coupled to the rear end of the upper cover, configured to cover the rear of the cell assembly.
[25]
In addition, the rear cover,
[26]
An opening is provided so that each of the refrigerant injection unit and the refrigerant discharge unit of the cooling member can be exposed to the outside;
[27]
An open gas outlet may be provided to communicate with the gas outlet passage.
[28]
Furthermore, the rear cover may include a mesh member inserted into the gas outlet.
[29]
In addition, the cell assembly may include a flame retardant sheet interposed between the plurality of secondary batteries.
[30]
Furthermore, the battery pack according to the present invention for achieving the above object includes at least one battery module.
[31]
In addition, the power storage device according to the present invention for achieving the above object includes a battery pack.
Effects of the Invention
[32]
According to one aspect of the present invention, the battery module of the present invention includes a base plate having at least one flame-retardant mesh sheet configured to cover the open portion of the gas discharge passage, thereby causing a fire or explosion among a plurality of secondary batteries. It is possible to prevent the flame from being transmitted from the secondary battery to another adjacent secondary battery through the gas exhaust passage. Accordingly, the safety of the battery module can be improved.
[33]
In addition, according to an aspect of an embodiment of the present invention, the battery module of the present invention uses an indirect cooling method using a refrigerant (liquid) instead of a cooling method in contact with air, so that when the secondary battery is ignited, the It is possible to solve the problem of the air cooling structure in which the propagation of ignition was promoted. Accordingly, it is possible to effectively reduce the risk of fire in the battery module.
[34]
And, according to another aspect of the present invention, the rear cover is provided with a mesh member inserted into the gas outlet, so that when a fire or explosion of the cell assembly inside the battery module occurs, the flame is prevented from being ejected through the gas outlet can do. Accordingly, it is possible to prevent the fire from spreading to objects adjacent to the battery module, thereby increasing the safety of using the battery module.
[35]
Furthermore, according to another aspect of the present invention, the cell assembly includes a flame retardant sheet interposed between a plurality of secondary batteries, so that even if a fire or explosion occurs in any one secondary battery among the plurality of secondary batteries, the flame retardant sheet It is possible to reduce the effect of the flame to the adjacent secondary battery by this, preventing secondary explosion or spread of fire. Accordingly, it is possible to effectively increase the safety of the battery module.
Brief description of the drawing
[36]
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 the present invention is described in such drawings should not be construed as being limited to
[37]
1 is a perspective view schematically showing a battery module according to an embodiment of the present invention.
[38]
2 is an exploded perspective view schematically illustrating a state in which components of a battery module are separated according to an embodiment of the present invention.
[39]
3 is a perspective view schematically illustrating a base plate that is a part of a battery module according to another embodiment of the present invention.
[40]
4 is a plan view schematically illustrating a thermally conductive pad that is a part of a battery module according to another embodiment of the present invention.
[41]
5 is a rear view schematically showing a battery module according to an embodiment of the present invention.
[42]
6 is a perspective view schematically illustrating a cell assembly that is a part of a battery module according to another embodiment of the present invention.
Modes for carrying out the invention
[43]
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.
[44]
Therefore, 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 spirit of the present invention, so at the time of the present application, various It should be understood that there may be equivalents and variations.
[45]
1 is a perspective view schematically showing a battery module according to an embodiment of the present invention. And, FIG. 2 is an exploded perspective view schematically illustrating a state in which components of a battery module are separated according to an embodiment of the present invention.
[46]
1 and 2 , a battery module 200 according to an embodiment of the present invention includes one or more cell assemblies 100 including a plurality of secondary batteries 110 , and a base plate 210 . include
[47]
Specifically, the cell assembly 100 may include a plurality of secondary batteries 110 stacked in the front-rear direction. The secondary battery 110 may be a pouch-type secondary battery 110 . For example, as shown in FIG. 2 , each of the two cell assemblies 100 may be configured in a form in which 21 pouch-type secondary batteries 110 are stacked side by side in the front-rear direction (Y direction).
[48]
In particular, the pouch-type secondary battery 110 may include an electrode assembly (not shown), an electrolyte (not shown), and a pouch 116 .
[49]
Each of the secondary batteries 110, when viewed in the F direction (shown in FIG. 1), has two wide surfaces respectively located in the front and rear directions, and sealing parts are located in the upper, lower, left, and right directions. It may be arranged in the form of standing perpendicular to the (Z direction). In other words, each secondary battery 110 may be configured in a vertically erected form. Meanwhile, in the present specification, unless otherwise specified, with respect to the up, down, front, rear, left, and right directions, when viewed in the F direction as a reference.
[50]
Here, terms indicating directions such as front, back, left, right, up, and down may vary depending on the position of the observer or the shape of the object. However, in the present specification, for convenience of explanation, directions such as front, rear, left, right, top, and bottom are separately indicated with reference to the time when viewed in the F direction.
[51]
Here, the pouch 116 may be configured as a pouch in which a concave-shaped accommodating part 115 is formed. In addition, the electrode assembly and the electrolyte may be accommodated in the accommodating part 115 . In addition, each pouch 116 includes an outer insulating layer, a metal layer, and an inner adhesive layer, and the inner adhesive layer is adhered to each other on the edge of the pouch 116 , thereby forming a sealing portion. Furthermore, a terrace portion may be formed at each end of the pouch 116 in the left and right direction (X direction) where the positive electrode lead 111 and the negative electrode lead 112 are formed.
[52]
In addition, the electrode assembly is an assembly of an electrode plate and a separator coated with an electrode active material, and may be configured in a form in which one or more positive electrode plates and one or more negative electrode plates are disposed with a separator interposed therebetween. In addition, a positive electrode tab is provided on the positive electrode plate of the electrode assembly, and one or more positive electrode tabs may be connected to the positive electrode lead 111 .
[53]
Here, the positive electrode lead 111 has one end connected to the positive electrode tab and the other end exposed to the outside of the pouch 116 , and the exposed portion is an electrode terminal of the secondary battery 110 , for example, a secondary It may function as a positive terminal of the battery 110 .
[54]
In addition, a negative electrode tab is provided on the negative electrode plate of the electrode assembly, and one or more negative electrode tabs may be connected to the negative electrode lead 112 . In addition, the negative lead 112 has one end connected to the negative electrode tab and the other end exposed to the outside of the pouch, and the exposed portion is an electrode terminal of the secondary battery 110 , for example, the secondary battery 110 . can function as the negative terminal of
[55]
Furthermore, as shown in FIG. 1 , when viewed directly in the F direction, the positive lead 111 and the negative lead 112 are in the left and right directions in opposite directions (X direction) with respect to the center of the secondary battery 110 . may be formed at the end of That is, the positive lead 111 may be provided at one end (left end) with respect to the center of the secondary battery 110 . In addition, the negative lead 112 may be provided at the other end (right end) with respect to the center of the secondary battery 110 .
[56]
For example, as shown in FIG. 2 , each secondary battery 110 of the cell assembly 100 may be configured such that the positive lead 111 and the negative lead 112 protrude in the left and right directions.
[57]
Therefore, according to this configuration of the present invention, in one secondary battery 110 , there is no interference between the positive electrode lead 111 and the negative electrode lead 112 , and the area of ​​the electrode lead can be increased.
[58]
In addition, the positive lead 111 and the negative lead 112 may be configured in a plate shape. In particular, the positive lead 111 and the negative lead 112 may protrude in a horizontal direction (X direction) in a state in which a wide surface is erected to face the front-rear direction.
[59]
Here, the horizontal direction may mean a direction parallel to the ground when the secondary battery 110 is placed on the ground, and may also be referred to as at least one direction on a plane perpendicular to the vertical direction.
[60]
However, the battery module 200 according to the present invention is not limited to the aforementioned pouch-type secondary battery 110, and various secondary batteries 110 known at the time of filing of the present invention may be employed.
[61]
3 is a perspective view schematically illustrating a base plate that is a part of a battery module according to another embodiment of the present invention.
[62]
Referring back to FIG. 3 together with FIGS. 1 and 2 , the base plate 210 may include at least one gas discharge passage 211 and a flame-retardant mesh sheet 216 .
[63]
Specifically, the gas discharge passage 211 may have sidewalls extending long in the front-rear direction so as to communicate with the outside. For example, as shown in FIG. 3 , the gas discharge passage 211 may include a left wall 211a, a right wall 211b, and a lower wall 211c. In addition, a portion of the sidewall of the gas discharge passage 211 may be provided with an open portion T1 opened in one direction. The open portion T1 may be, for example, as shown in FIG. 3 , an upper portion of the gas discharge passage 211 may be opened to form an open portion T1 .
[64]
For example, as shown in FIGS. 2 and 3 , the base plate 210 may be provided with two gas discharge passages 211 located on both sides in the left and right directions. In this case, the two gas discharge passages 211 may extend from the front end to the rear end of the base plate 210 .
[65]
In addition, the flame-retardant mesh sheet 216 may be configured to cover the opening (T1). The flame-retardant mesh sheet 216 is inserted into the open hole of the open portion T1, or the upper portion of the open portion T1, so as to completely cover the open portion T1 of the gas discharge passage 211. may be configured to cover the
[66]
Here, the flame-retardant mesh sheet 216 may be provided with a flame-retardant material that is difficult to burn. For example, the flame-retardant material may be a chlorine-containing vinyl chloride resin, chlorinated paraffin, decabromodiphenyl oxide, antimony trioxide, and the like. The flame-retardant mesh sheet 216 is a raw fabric made of multi-filament fibers such as polyester, nylon, polypropylene, etc., coated with a flame-retardant vinyl chloride-based paste resin composition, then heat-treated and processed into a net shape. have.
[67]
The flame-retardant mesh sheet 216 may be configured to pass the gas discharged from the cell assembly 100 but not to pass the flame. That is, the flame-retardant mesh sheet 216 may serve to block the generated flame from being transmitted to an adjacent secondary battery.
[68]
For example, the flame-retardant mesh sheet 216 may have a mesh that is tight enough to pass the gas but not the flame. The flame-retardant mesh sheet 216 may have a mesh eye size of 0.1 mm X 0.1 mm to 5 mm X 5 mm, and more preferably 1 mm X 1 mm to 2 mm X 2 mm.
[69]
Therefore, according to this configuration of the present invention, the battery module 200 of the present invention is a base plate having at least one flame-retardant mesh sheet 216 configured to cover the open portion T1 of the gas discharge passage 211 . By providing the , it is possible to prevent the flame from being transmitted from the secondary battery in which a fire or explosion has occurred among the plurality of secondary batteries to another secondary battery adjacent thereto through the gas discharge passage. Accordingly, the safety of the battery module can be improved.
[70]
In addition, the base plate 210 may include a cooling member 218 . Specifically, the cell assembly 100 may be mounted on the cooling member 218 . For example, as shown in FIGS. 2 and 3 , 42 secondary batteries 110 may be mounted on the cooling member 218 . In addition, the cooling member 218 may be a heat sink having an exterior material made of a material having high thermal conductivity. That is, the cooling member 218 may be configured to absorb heat generated in the cell assembly 100 mounted thereon in a conductive manner through the exterior material.
[71]
A refrigerant passage (not shown) configured to move the refrigerant may be provided inside the cooling member 218 . In addition, the cooling passage may include a plurality of straight portions (not shown) extending long in the front-rear direction and a curved portion (not shown) connecting the plurality of straight portions. However, the refrigerant flow path is not limited to a specific shape, and the shape and location may be appropriately designed and changed in consideration of the heat distribution of the cell assembly. In addition, a refrigerant injection unit 219a and a refrigerant discharge unit 219b may be provided at both ends of the refrigerant passage.
[72]
For example, as shown in Figures 2 and 3, the base plate 210 may be provided with a cooling member 218 between the two gas discharge passages 211 located on both sides in the left and right direction. . In this case, a refrigerant injection unit 219a and a refrigerant discharge unit 219b may be provided at the rear end of the cooling member 128 .
[73]
Therefore, according to this configuration of the present invention, the battery module 200 of the present invention uses an indirect cooling method using a refrigerant (liquid) rather than an air cooling method, so that when the secondary battery is ignited, the It is possible to solve the problem of the air cooling structure in which the propagation of ignition was promoted. Accordingly, it is possible to effectively reduce the risk of fire in the battery module 200 .
[74]
Furthermore, the battery module 200 may include a thermally conductive pad 240 interposed between the cooling member 218 of the base plate 210 and the plurality of secondary batteries 110 . The thermally conductive pad 240 may include a high thermally conductive polymer resin or silicone-based resin. For example, the polymer resin may be a polysiloxane resin or an epoxy resin.
[75]
For example, as shown in FIG. 2 , the thermally conductive pad 240 may be disposed on the entire upper surface of the cooling member 218 in a form coated with a predetermined thickness.
[76]
Therefore, according to this configuration of the present invention, the cooling member 218 can more effectively transfer the heat generated in the cell assembly 100 to the cooling member 218 by providing the thermally conductive pad 240 . have an effect
[77]
4 is a plan view schematically illustrating a thermally conductive pad that is a part of a battery module according to another embodiment of the present invention.
[78]
Referring back to FIG. 4 together with FIG. 3 , the thermally conductive pad 240A according to another embodiment may have an insertion groove G1 into which a portion of each of the plurality of secondary batteries 110 is inserted. The insertion groove G1 may have a shape that is internally inserted so that a portion of the sealing portion of the plurality of secondary batteries 110 is inserted. The insertion groove G1 may be formed at a position corresponding to the plurality of secondary batteries 110 . For example, as shown in FIG. 4 , 42 insertion grooves G1 may be formed so that a portion of the sealing portion of each of the 24 secondary batteries 110 is inserted.
[79]
Therefore, according to this configuration of the present invention, the thermally conductive pad 240A is provided with an insertion groove G1 so that a portion of each of the plurality of secondary batteries 110 is inserted. The contact area between the secondary batteries 110 of the cell assembly 100 increases, so that heat generated in the cell assembly 100 can be effectively absorbed. In addition, the insertion groove G1 may serve as a guide in which each of the plurality of secondary batteries 110 stacked in one direction may be disposed in a fixed position.
[80]
Referring back to FIGS. 1 and 2 , the battery module 200 according to an embodiment of the present invention includes an upper cover 220 , a bus bar assembly 270 , a front cover 250 , and a rear cover 260 . may include.
[81]
Specifically, the upper cover 220 may include a top portion 224 and a side portion 226 . The top portion 224 may have a plate shape extending in a horizontal direction to cover an upper portion of the cell assembly 100 . The side part 226 may have a plate shape extending downward from both ends of the top part 224 in the left and right directions to cover both sides of the cell assembly 100 in the left and right directions.
[82]
In addition, the side portion 226 may be coupled to a portion of the base plate 210 . For example, as shown in FIG. 2 , the upper cover 220 may include a top portion 224 having a plate shape extending in the front and rear left and right directions. The upper cover 220 may include two side portions 226 extending downward from both ends of the top portion 224 in the left and right directions. Furthermore, the lower end of each of the two side portions 226 may be configured to be coupled to both ends of the base plate 210 in the left and right directions. In this case, the coupling method may be a male-female coupling method or a welding coupling method.
[83]
Further, the side portion 226 may be provided with a beading portion B1 protruding inward in which the secondary battery is located on a portion of the side portion 226 . For example, as shown in FIG. 2 , seven beading portions B1 protruding in an inward direction in which the cell assembly 100 is located may be formed in one side portion 226 .
[84]
Therefore, according to this configuration of the present invention, the base plate 210 has a structure that can stably protect the plurality of secondary batteries 110 from external impact, safety can be increased.
[85]
The bus bar assembly 270 may include bus bars 272 positioned on left and right sides with respect to the cell assembly 100 , and a bus bar frame 276 .
[86]
Specifically, the bus bar 272 may include a conductive metal, for example, copper, aluminum, nickel, or the like. The bus bar 272 may be configured to electrically connect the plurality of secondary batteries 110 of the cell assembly 100 to each other. The bus bar 272 may have a slit 272h that is opened so that the electrode leads of the plurality of secondary batteries 110 are inserted. For example, as shown in FIG. 2 , the bus bar 272 includes the negative lead 112 of the secondary battery 110 inserted into the plurality of slits and the positive lead 111 of the other secondary battery 110 . ) each can be contact-connected.
[87]
Furthermore, the bus bar frame 276 may be configured to mount a plurality of the bus bars 272 . An open communication part 276h may be formed in the bus bar frame 276 so that the plurality of secondary batteries 110 and the bus bar 272 communicate with each other. Accordingly, the bus bar 272 may be in contact with the positive lead 111 or the negative lead 112 of the plurality of secondary batteries 110 through the communication portion 276h of the bus bar frame 276 . . The bus bar frame 276 may include an electrically insulating material. For example, the busbar frame 276 may be made of a plastic material. More specifically, the plastic material may be polyvinyl chloride.
[88]
Furthermore, the front cover 250 may be configured to cover the front of the plurality of secondary batteries 110 . For example, the front cover 250 may have a plate shape having a size larger than the size of the front surfaces of the plurality of secondary batteries 110 . The plate shape may be erected in a vertical direction.
[89]
Furthermore, a portion of the outer periphery of the front cover 250 may be coupled to the base plate 210 . For example, the lower portion of the outer periphery of the front cover 250 may be coupled to the front end of the base plate 210 . Furthermore, the upper portion of the outer periphery of the front cover 250 may be coupled to the front end of the upper cover 220 . Here, as the coupling method, bolt coupling may be applied.
[90]
In addition, the rear cover 260 may be configured to cover the rear of the cell assembly 100 . For example, the rear cover 260 may have a plate shape having a size larger than that of the rear surfaces of the plurality of secondary batteries 110 .
[91]
In addition, a portion of the outer periphery of the rear cover 260 may be coupled to the base plate 210 . For example, the lower portion of the outer periphery of the rear cover 260 may be coupled to the front end of the base plate 210 . Furthermore, the upper portion of the outer periphery of the rear cover 260 may be coupled to the rear end of the upper cover 220 . Here, as the coupling method, bolt coupling may be applied.
[92]
5 is a rear view schematically showing a battery module according to an embodiment of the present invention.
[93]
Referring back to FIG. 5 along with FIGS. 2 and 3 , the rear cover 260 is configured so that the refrigerant injection part 219a and the refrigerant discharge part 219b of the cooling member 218 can be exposed to the outside, respectively. An open opening 262h may be provided. The opening 262h may have a size corresponding to or larger than the cross-section of the opening 262h so that each of the refrigerant injection unit 219a and the refrigerant discharge unit 219b is exposed.
[94]
In addition, each of the refrigerant injection unit 219a and the refrigerant discharge unit 219b may be inserted into the two openings 262h and protrude to the outside. Accordingly, the refrigerant injection unit 219a and the refrigerant discharge unit 219b exposed through the opening 262h may be easily connected to an external device for injecting and recovering the refrigerant.
[95]
In addition, the rear cover 260 may be provided with a gas outlet 264h opened to communicate with the gas outlet passage 211 . The rearmost end of the gas outlet passage 211 may be connected to the gas outlet 264h. Accordingly, the gas moving through the gas discharge passage 211 may be discharged to the outside through the gas discharge port 264h.
[96]
Therefore, according to this configuration of the present invention, the present invention configures the gas moving to the gas discharge passage to be discharged to the outside through the opening of the rear cover, so that the electronic device located in front of the battery module or the bus bar located on the left and right sides It is possible to avoid the influence of the gas generated by the assembly, thereby preventing secondary accidents or malfunctions such as disconnection or short circuit in advance.
[97]
Furthermore, the rear cover 260 may include a mesh member 266 inserted into the gas outlet 264h. The mesh member 266 may correspond to the size of the cross-sectional area of ​​the gas outlet 264h or may be larger. The mesh member 266 may be configured to completely cover the gas outlet 264h. The mesh member 266 may be configured to pass the gas discharged from the cell assembly 100 but not the flame. That is, the mesh member 266 may serve to block the internal flame from being transmitted to the outside.
[98]
For example, the mesh member 266 may have a fine mesh that allows gas to pass through but not flame to pass through. The mesh member 266 may have a mesh eye size of 0.1 mm X 0.1 mm to 5 mm X 5 mm, and more preferably 1 mm X 1 mm to 2 mm X 2 mm.
[99]
Here, the mesh member 266 may include a flame retardant material that is difficult to burn. For example, the flame retardant material may be a chlorine-containing vinyl chloride resin, chlorinated paraffin, decabromodiphenyl oxide, antimony trioxide, and the like. The mesh member 266 may be a raw fabric obtained by weaving multifilament fibers such as polyester, nylon, polypropylene, etc., coated with a flame-retardant vinyl chloride-based paste resin composition, then heat-treated and processed into a net shape. .
[100]
For example, as shown in FIG. 5 , two gas outlets 264h may be provided in the rear cover 260 . A mesh member 266 may be inserted into each of the two gas outlets 264h.
[101]
Therefore, according to this configuration of the present invention, the rear cover 260 is provided with a mesh member 266 inserted into the gas outlet 264h, thereby causing a fire or fire of the cell assembly 100 inside the battery module 200 or When an explosion occurs, it is possible to prevent the flame from being ejected through the gas outlet 264h. Accordingly, it is possible to prevent the fire from spreading to objects adjacent to the battery module 200 , and thus the use safety of the battery module 200 can be improved.
[102]
6 is a perspective view schematically illustrating a cell assembly that is a part of a battery module according to another embodiment of the present invention.
[103]
Referring to FIG. 6 , the cell assembly 100A according to another embodiment of the present invention may include a flame retardant sheet 120 interposed between the plurality of secondary batteries 110 . The flame-retardant sheet 120 may have a size equal to or larger than the size of the surfaces on which the plurality of secondary batteries 110 face each other. For example, as shown in FIG. 6 , 20 flame retardant sheets 120 may be interposed between 21 secondary batteries 110 . In this case, the flame-retardant sheet 120 may have a size corresponding to or smaller than the size of the area in the front-rear direction of the secondary battery 110 . That is, it is appropriate that the flame-resistant sheet 120 is formed so as not to protrude outward than the sealing portion formed in the left and right directions.
[104]
For example, the flame-retardant sheet 120 may have a fine mesh that passes the gas but does not pass the flame. The flame retardant sheet 120 may have a mesh eye size of 0.1 mm X 0.1 mm to 5 mm X 5 mm, and more preferably 1 mm X 1 mm to 2 mm X 2 mm.
[105]
Here, the flame-retardant sheet 120 may be provided with a flame-retardant material that is difficult to burn. For example, the flame retardant material may be a chlorine-containing vinyl chloride resin, chlorinated paraffin, decabromodiphenyl oxide, antimony trioxide, and the like. The flame-retardant sheet 120 may be a raw fabric obtained by weaving multifilament fibers such as polyester, nylon, polypropylene, etc., coated with a flame retardant vinyl chloride paste resin composition, then heat-treated and processed into a net shape. .
[106]
Therefore, according to this configuration of the present invention, the cell assembly 100A includes the flame retardant sheet 120 interposed between the plurality of secondary batteries 110 , so that any one of the plurality of secondary batteries 110 . Even if a fire or explosion occurs in one secondary battery 110, the effect of the flame to the adjacent secondary battery 110 can be reduced by the flame-retardant sheet 120, thereby preventing the secondary explosion or the spread of fire. have. Accordingly, it is possible to effectively increase the safety of the battery module.
[107]
Meanwhile, a battery pack (not shown) according to an embodiment of the present invention includes at least one or more of the battery modules 200 . In addition, the battery pack may further include various devices (not shown) for controlling the charging and discharging of the plurality of secondary batteries 110 , for example, a battery management system (BMS), a current sensor, a fuse, and the like.
[108]
In addition, the power storage device according to an embodiment of the present invention includes the battery pack. The power storage device may further include a controller having a switch capable of on/off control of the operation of the battery pack.
[109]
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 position of the object or the position of the observer. It will be apparent to those skilled in the art that the present invention can.
[110]
[111]
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.
[112]
[Explanation of code]
[113]
200: battery module 100: cell assembly
[114]
110: secondary battery 210: base plate
[115]
211: gas exhaust passage 216: flame-retardant mesh sheet
[116]
218: cooling members 219a, 219b: refrigerant injection unit, refrigerant discharge unit
[117]
240: thermally conductive pad G1: insertion groove
[118]
220: upper cover 224, 226: top portion, side portion
[119]
250: front cover 260: rear cover
[120]
262h: opening 264h: gas outlet
[121]
266: mesh member 120: flame retardant sheet
[122]
270: busbar assembly 272, 276: busbar, busbar frame
Industrial Applicability
[123]
The present invention relates to a battery module including an inner cover. Also, the present invention can be applied to a battery pack including at least one battery module and an industry related to a vehicle including the battery pack.

WE CLAIMS

[Claim 1]a cell assembly including a plurality of secondary batteries stacked on each other in a front-rear direction; and at least one gas discharge passage configured to mount a plurality of secondary batteries of the cell assembly on an upper portion, the side wall extending in the front and rear directions to communicate with the outside, and an opening part of the side wall formed in one direction, and the opening portion a base plate having at least one flame-retardant mesh sheet configured to cover; A battery module comprising a.
[Claim 2]
According to claim 1, wherein the base plate, the cell assembly is mounted on the upper side, is located on one side of the gas discharge passage, a refrigerant passage elongated in at least one direction so as to communicate with the outside, and a refrigerant for injecting the refrigerant A battery module comprising a cooling member having an injection unit and a refrigerant discharge unit through which the refrigerant is discharged.
[Claim 3]
The battery module according to claim 2, further comprising a thermally conductive pad interposed between the cooling member of the base plate and the plurality of secondary batteries.
[Claim 4]
The battery module according to claim 3, wherein the thermally conductive pad has an insertion groove formed at a position corresponding to the plurality of secondary batteries so that a portion of each of the plurality of secondary batteries is inserted.
[Claim 5]
According to claim 2, wherein the top portion extending in the horizontal direction to cover the upper portion of the cell assembly, and the lower portion from both ends in the left and right direction of the top portion so as to be coupled to the base plate and cover both sides in the left and right direction of the cell assembly an upper cover having a side portion extending in the direction; a bus bar assembly including a bus bar configured to be electrically connected to the cell assembly, and a bus bar frame mounted with the bus bar and coupled to the side portion; a front cover coupled to the front end of the upper cover and configured to cover the front of the cell assembly; and a rear cover coupled to the rear end of the upper cover and configured to cover the rear of the cell assembly. Battery module, characterized in that it further comprises.
[Claim 6]
The method of claim 5, wherein the rear cover is provided with an opening opening so that each of the refrigerant injecting unit and the refrigerant discharging unit of the cooling member can be exposed to the outside, and the gas outlet opening to communicate with the gas outlet passage. Battery module, characterized in that provided.
[Claim 7]
The battery module according to claim 6, wherein the rear cover has a mesh member inserted into the gas outlet.
[Claim 8]
The battery module according to claim 1, wherein the cell assembly includes a flame retardant sheet interposed between the plurality of secondary batteries.
[Claim 9]
A battery pack comprising at least one battery module according to any one of claims 1 to 8.
[Claim 10]
A power storage device comprising the battery pack according to claim 9 .