technical field
[One]
This application claims the benefit of priority based on Korean Patent Application No. 2020-0079312 dated June 29, 2020, and all contents disclosed in the literature of the Korean patent application are incorporated as a part of this specification.
[2]
The present invention relates to a battery module including a heat dissipation member and a method of manufacturing the heat dissipation member, and specifically, a heat dissipation member having a through hole formed therein to prevent thermal runaway phenomenon by directly injecting water into an ignited battery cell. It relates to a battery module and a method of manufacturing the heat dissipation member comprising a.
background
[3]
A lithium secondary battery capable of charging and discharging is suitable for use as a built-in battery cell because it does not require replacement of the battery cell.
[4]
For example, the lithium secondary battery is widely used as an energy source for a wireless mobile device, which is a multifunctional small product, or a wearable device, which is worn on the body, as well as an existing conventional battery that causes air pollution. It is also used as an energy source or power storage system (ESS) for electric and hybrid electric vehicles, which are suggested as an alternative to gasoline and diesel vehicles.
[5]
As such, as the lithium secondary battery is used as an energy source of large capacity and high output, the problem of securing the safety of the lithium secondary battery is an important subject of interest.
[6]
In general, a power storage device uses a method of injecting water into a battery module or battery pack by using a separate water injection device when a fire occurs in a battery cell accommodated therein.
[7]
However, in this case, facilities and space for providing the water injection device are required, and there is a problem in that the ignition is spread due to the time difference between the sensing time of the gas discharged through venting of the battery cell and the water injection.
[8]
Alternatively, by adopting a structure in which an insulating material or a fire extinguishing agent is disposed inside or outside a battery module or battery pack, a method of blocking heat transfer between battery cells or cooling a ignited battery cell may be used.
[9]
Although this method can solve the problem of requiring a facility and space for providing a separate watering device, the unit cost of the battery module and battery pack increases due to the high price of heat insulators and fire extinguishing agents. In addition, since the volume of the battery module or battery pack increases by adding additional parts, there is a problem in that the energy density is lowered. In addition, when the amount of the fire extinguishing agent provided inside the battery cell is insufficient to extinguish all of the thermal energy emitted from the battery cell, there is a problem in that it is difficult to prevent ignition of the battery cell.
[10]
In this regard, Patent Document 1 relates to an automatic fire extinguishing device for an energy storage system, in which one side of the connection line is connected and fixed, and high-pressure carbon dioxide is supplied to the inside of the fire extinguishing line in a no-power manner without applying a separate power source. Since it includes a carbon dioxide supply unit configured to include a compressed and stored carbon dioxide supply member, Patent Document 1 requires a separate configuration of a fire extinguishing line, a carbon dioxide supply member, etc., so it does not solve the problem of increasing the size of the power storage device. can't
[11]
Patent Document 2 includes a reservoir for a fire extinguishing agent and a conduit means for guiding the fire extinguishing agent, wherein the conduit means is a vent emitted from a vent hole formed in any one of a plurality of battery cells to collide with a gas jet and wherein the conduit means is for a cell system configured to be melted by the vent-gas jet.
[12]
The battery system of Patent Document 2 is provided with a storage for storing the extinguishing agent and a conduit means for guiding the extinguishing agent, and the problem of increasing the volume of the battery system is still not solved.
[13]
As such, when a battery module and battery pack having a large capacity and high output ignite, there is a high need for a technology capable of preventing a decrease in energy density while minimizing flame spread.
[14]
(Prior art literature)
[15]
(Patent Document 1) Korean Patent Publication No. 19984817 (2019.05.27)
[16]
(Patent Document 2) Korean Patent Publication No. 2019-0085005 (2019.07.17)
DETAILED DESCRIPTION OF THE INVENTION
technical challenge
[17]
The present invention is to solve the above problems, and in order to prevent the transfer of thermal energy to adjacent battery cells when the battery cell is ignited or exploded, a battery cell in which a refrigerant for a heat dissipation member provided inside the battery module is ignited An object of the present invention is to provide a battery module including a heat dissipation member having a structure that is directly injected into the cells and a method of manufacturing the heat dissipation member.
means of solving the problem
[18]
A battery module according to the present invention for achieving this object is combined with a battery cell stack in which a plurality of pouch-type battery cells are stacked, a battery module housing accommodating the battery cell stack, and a part of the battery module housing The heat dissipation member may have a structure in which a through hole is formed in a heat sink facing the battery cell stack, and a sealing member is added to the through hole.
[19]
In the battery module according to the present invention, the battery module housing includes an upper plate and a lower plate, the heat dissipation member includes a heat sink and a refrigerant flowing portion, and a refrigerant flowing portion is formed between the upper plate and the heat sink. The upper plate and the heat sink may be combined.
[20]
In the battery module according to the present invention, the heat dissipation member may be coupled to the lower plate and the heat sink in a form in which a refrigerant flowing portion is formed between the lower plate and the heat sink.
[21]
In the battery module according to the present invention, the sealing member may be made of a material melted by a high-temperature gas or sparks emitted from the pouch-type battery cell.
[22]
In addition, the through-hole may be opened by melting of the sealing member, and a refrigerant may be injected into the pouch-type battery cell through the through-hole.
[23]
In the battery module according to the present invention, the refrigerant may be cooling water, and the cooling water may not contain a combustible material.
[24]
In addition, a flow path for guiding the flow of the coolant may be formed in the upper plate and the lower plate.
[25]
In the battery module according to the present invention, the battery module housing includes an upper plate and a lower plate, and a water tank is coupled to the inner surface of the upper plate as the heat dissipation member, and in the water tank, the inner surface of the upper plate A through hole is formed on the second surface facing the first surface coupled to the through hole, and a sealing member may be added to the through hole.
[26]
In the battery module according to the present invention, the battery module housing includes an upper plate and a lower plate, and a water tank is coupled to the inner surface of the lower plate as the heat dissipation member, and in the water tank, it is coupled to the inner surface of the lower plate. A through hole may be formed on a second surface facing the first surface, and a sealing member may be added to the through hole.
[27]
In the battery module according to the present invention, the through hole is formed at a position where the supply of cooling water to the ignited pouch-type battery cell is possible even if any pouch-type battery cell ignites, and the number and size of the pouch-type battery cell Accordingly, the number of the through holes may be determined.
[28]
In the battery module according to the present invention, the sealing member may include an extension portion that fills the through hole and further extends outwardly from the periphery of the through hole on the inner and outer surfaces of the heat sink.
[29]
In the battery module according to the present invention, between the inner surface of the heat sink and the outer surface of the heat sink, a groove may be formed in a portion where the extension portion is formed.
[30]
In addition, the vertical cross-section of the heat sink in which the groove is formed may be formed in any one or more shapes selected from the group consisting of polygons, semi-circles, and semi-ovals.
[31]
The present invention also provides a method of manufacturing a heat dissipation member included in the battery module. Specifically, the method of manufacturing the heat dissipation member includes the steps of (a) arranging a flat plate for a heat sink of the heat dissipation member between a die and a holder, (b) punching the flat plate to form a through hole to manufacture a heat sink, (c) ) mounting the heat sink to a mold for insert extrusion molding, (d) fixing the heat sink to the mold and injecting a resin for a sealing member, and (e) removing the mold and a heat sink to which a sealing member is added and collecting, a protrusion for forming a groove in the heat sink may be formed on the die and the holder.
[32]
In the method of manufacturing a heat dissipation member according to the present invention, the heat dissipation plate may be coupled to an upper plate and a lower plate of the battery module housing with a separation space therebetween, and a refrigerant flow portion through which a refrigerant flows in and out may be formed in the separation space.
[33]
In the method of manufacturing a heat dissipation member according to the present invention, the heat dissipation plate constitutes a water tank coupled to the upper and lower plates of the battery module housing, and the other side facing one side of the water tank coupled to the upper and lower plates. The heat sink may be disposed on the.
Brief description of the drawing
[34]
1 is a perspective view of a battery module according to the present invention.
[35]
2 is a vertical cross-sectional view of a battery module according to an embodiment.
[36]
3 is a perspective view and a plan view of a disassembled state of the heat dissipation member according to the present invention.
[37]
4 is a plan view of a heat sink according to the present invention.
[38]
FIG. 5 is a partially enlarged view of FIG. 2 .
[39]
6 is an enlarged vertical cross-sectional view of a battery module in which a sealing member is added to a grooved heat sink.
[40]
7 is a vertical cross-sectional view illustrating a state in which a sealing member is added to a grooved heat sink.
[41]
8 is a vertical cross-sectional view of a battery pack according to another exemplary embodiment.
[42]
It is a front view which shows typically the manufacturing process of a heat sink.
[43]
10 is a front view schematically illustrating a process of adding a sealing member to a heat sink.
Modes for carrying out the invention
[44]
Hereinafter, embodiments in which those of ordinary skill in the art to which the present invention pertains can easily practice the present invention will be described in detail with reference to the accompanying drawings. However, in describing in detail the principle of operation of the preferred embodiment of the present invention, there is no reference to related known functions or configurations. If it is determined that the detailed description may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.
[45]
In addition, the same reference numerals are used throughout the drawings for parts having similar functions and functions. Throughout the specification, when it is said that a part is connected to another part, it includes not only a case in which it is directly connected, but also a case in which it is indirectly connected with another element interposed therebetween. In addition, the inclusion of any component does not exclude other components unless otherwise stated, but means that other components may be further included.
[46]
In addition, descriptions that limit or add elements may be applied to all inventions unless there are special limitations, and are not limited to specific inventions.
[47]
Also, throughout the description and claims of the present application, the singular includes the plural unless otherwise indicated.
[48]
Also, throughout the description and claims herein, "or" is intended to include "and" unless stated otherwise. Therefore, "comprising A or B" means all three cases including A, including B, or including A and B.
[49]
In addition, all numerical ranges include the values ​​at both ends and all intermediate values ​​therebetween, unless expressly stated otherwise.
[50]
The present invention will be described along with detailed examples according to the drawings.
[51]
1 is a perspective view of a battery module according to the present invention.
[52]
Referring to FIG. 1 , the battery module 100 according to the present invention includes a battery module housing accommodating a battery cell stack in which a plurality of pouch-type battery cells 101 are stacked, and an upper surface of the battery cell stack. and a heat dissipation member disposed on the lower surface.
[53]
As a plurality of pouch-type battery cells 101, bidirectional pouch-type battery cells 101 in which the electrode leads 102 protrude in opposite directions are shown in FIG. It goes without saying that unidirectional pouch-type battery cells protruding in the same direction may be used.
[54]
The battery module housing is disposed between the upper plate 110 disposed on the upper part of the battery cell stack, the lower plate 120 disposed under the battery cell stack, and the upper plate 110 and the lower plate 120 . and a side plate 130 disposed on a side surface of the battery cell stack.
[55]
In addition, an end plate (not shown) is coupled to the upper plate 110 , the lower plate 120 and the side plate 130 on the outside in the direction in which the electrode lead 102 of the pouch-type battery cells 101 protrudes. A housing of the battery module may be assembled.
[56]
In addition, the shape of the battery module housing is not limited to the structure shown in FIG. 1 , and unlike that shown in FIG. 1 , the battery module housing may be a monoframe type or a U frame type frame.
[57]
2 is a vertical cross-sectional view of a battery module according to an embodiment.
[58]
Referring to FIG. 2 , in the battery module, a battery cell stack in which a plurality of pouch-type battery cells 101 are stacked is accommodated in a battery module housing including an upper plate 110 and a lower plate 120 .
[59]
The heat dissipation member 200 includes a heat dissipation plate 210 and a refrigerant flow unit 220 through which refrigerant flows in and out. The heat sink 210 is coupled to the upper plate 110 with a spacing therebetween, and the space formed by the spacing becomes the refrigerant flow part 220 . Accordingly, the upper plate 110 , the heat sink 210 , and the refrigerant flow unit 220 have an integrated structure.
[60]
That is, the heat dissipation member 200 is integrally coupled to the upper plate 110 and is located on the upper part of the battery cell stack.
[61]
In addition, the heat dissipation member 200 ′ includes a heat dissipation plate 210 and a refrigerant flow unit 220 through which refrigerant flows in and out. The heat sink 210 is coupled to the lower plate 120 with a spacing therebetween, and the space formed by the spacing becomes the refrigerant flow unit 220 . Accordingly, the lower plate 120 , the heat sink 210 , and the refrigerant flow unit 220 have an integrated structure.
[62]
That is, the heat dissipation member 200 ′ is integrally coupled to the lower plate 120 and is positioned under the battery cell stack.
[63]
A through hole 230 is formed in the heat sink 210 , and a sealing member 240 is added to the through hole 230 . The sealing member 240 is made of a material that is melted by a high-temperature gas or sparks emitted from the pouch-type battery cell 101 . That is, in a normal state like the pouch-type battery cell 101, the sealing member 240 seals the through-hole 230, but, like the pouch-type battery cell 103, when the temperature rises or fire occurs, it is sealed. The member 240 is melted to open the through hole 230 . The refrigerant of the refrigerant flow unit 220 is directly injected into the pouch-type battery cell 103 through the opened through-hole. By such a process, it is possible to quickly prevent thermal runaway from expanding by rapidly cooling the overheated or ignited pouch-type battery cell.
[64]
The sealing member is a material that is melted in a high-temperature gas or spark ejected by venting of a pouch-type battery cell having an increased temperature, and a thermoplastic polymer resin having a melting point of about 200° C. or less may be applied, for example. For example, as the thermoplastic polymer resin, materials having a melting point of about 100° C. or more and 200° C. or less, such as polyethylene and polypropylene, may be used.
[65]
On the other hand, when cooling water is applied as the refrigerant, considering that the cooling water is directly injected into the pouch-type battery cell, it is prevented that the flame of the pouch-type battery cell increases or explosion occurs due to the injection of the coolant. Needs to be. Therefore, it is preferable that the additive contained in the cooling water does not contain a combustible material. Alternatively, when a combustible material is included in the coolant as an additive, the amount of the additive is enough to prevent a secondary explosion for the pouch-type battery cell, and at the same time it is used as an antifreeze to prevent the coolant from freezing. can
[66]
In the heat dissipation member according to the present invention, the heat dissipation member 200 of FIG. 2 is a form in which the heat dissipation plate is combined with the upper plate, and the heat dissipation member 200 ′ has all configurations except that the heat dissipation plate is coupled to the lower plate. Since the same can be applied, the following description will be made based on the heat dissipation member 200 .
[67]
3 is a perspective view and a plan view of a disassembled state of the heat dissipation member according to the present invention.
[68]
Referring to FIG. 3 together with FIG. 2 , a perspective view of a state in which the heat sink 210 is removed in order to explain the internal structure of the heat radiation member in the heat radiation member to which the upper plate 110 and the heat sink 210 are coupled is shown in (a). and a plan view of the heat sink 210 is shown in (b).
[69]
A partition wall 215 for guiding the flow of cooling water used as a refrigerant is formed on the upper plate 110 , and a flow path is formed between the partition walls 215 .
[70]
The cooling water inlet and cooling water outlet indicated by arrows are formed adjacent to the outer periphery of one side of the upper plate 110, and the cooling water inlet and the cooling water outlet are formed in the center of the outer periphery of one side in the width direction (a) of the upper plate.
[71]
In this case, since the cooling water flowing into the cooling water inlet has the lowest temperature and the cooling water discharged through the cooling water outlet has the highest temperature, the temperature deviation of the entire cooling water flowing through the refrigerant flowing portion may be small. Accordingly, in the case of forming the flow path having such a shape, uniform heat dissipation can be exhibited in the entire portion of the heat dissipation member.
[72]
3B shows a state in which the through hole 230 is formed in the heat sink 210 .
[73]
In the heat sink 210 , the through holes 230 having a circular shape on a plane are arranged to be spaced apart from each other at regular intervals along the horizontal and vertical directions.
[74]
Even if any pouch-type battery cell ignites, a through hole should be formed at a position where cooling water can be supplied to the ignited pouch-type battery cell. That is, it is preferable that at least one through-hole is disposed in all pouch-type battery cells so that cooling water can be supplied to all pouch-type battery cells. Accordingly, the number and spacing of the through-holes may be adjusted according to the number and size of the pouch-type battery cells.
[75]
4 is a plan view of a heat sink according to the present invention.
[76]
Referring to FIG. 4 , the shape of the through holes 230 ′ and 230 ″ formed in the heat sink 210 is different from the shape of the through hole 230 of FIG. 3 .
[77]
When the battery cells are arranged so that the short axis direction of the heat sink 210 shown in FIG. 4 and the longitudinal direction L of the battery cells are parallel to each other, one through hole 230 ′ has one through hole and two or more pouch-type battery cells. They are formed obliquely to cover the battery cells, and the through hole 230 ″ is formed in a direction perpendicular to the longitudinal direction L of the battery cells to cover two or more pouch-type battery cells.
[78]
When a through hole of this type is formed, when the sealing member is melted by heat or explosion of one of the pouch-type battery cells, the through hole is formed large, so it is located adjacent to the battery cell that has generated heat and exploded. Cooling water may be added to the surface of the battery cell that does not generate heat or explode. Therefore, it is possible to prevent the thermal runaway phenomenon from occurring by lowering the heat generation and the temperature of the non-explosive battery cell.
[79]
FIG. 5 is a partially enlarged view of FIG. 2 .
[80]
Referring to FIG. 5 , a refrigerant flow portion 220 is formed between the heat sink 210 and the upper plate 110 , and a partition wall 215 is formed between the coolant flow portions 220 , A flow path of the refrigerant is formed by this.
[81]
A space may be generated between the battery cell stack and the heat sink 210 , and for each individual battery cell 101 , a deviation may occur in the distance between the battery cell and the heat sink 210 . As such, the heat dissipation property of discharging the heat inside the battery module to the outside of the battery module is reduced by the space formed between the battery cell stack and the heat sink 210 .
[82]
In order to prevent such a problem, a thermal interface material (TIM) 390 may be filled in a space between the battery cell stack and the heat sink 210 .
[83]
heat transfer material (390) Since the silver widens the thermal contact between the battery cell stack and the heat sink, thermal energy generated from the battery cell stack can be quickly discharged into the battery module.
[84]
However, when the thermal energy emitted from the pouch-type battery cell does not directly contact the sealing member by the heat transfer material 390, the sealing member may not reach the melting temperature. Accordingly, the addition of the heat transfer material may be omitted.
[85]
Alternatively, the heat transfer material may not be formed under the through hole of the heat sink and may be added only to the other portions. In this case, even when a heat transfer material is added, heat energy of the vented battery cell is not lost and can be directly transferred to the sealing member, so that the sealing member is melted to supply the refrigerant to the vented battery cell.
[86]
On the other hand, a sealing member 240 is added to the through hole 230 penetrating the heat sink 210, for example, the sealing member 240 fills the through hole 230, and the inner surface of the heat sink ( 211) and an extension 241 that further extends outwardly around the through hole 230 on the outer surface 212 of the heat sink.
[87]
Since the extension portion 241 is formed in the sealing member 240 , the sealing member 240 is removed by the pressure of the coolant flowing through the refrigerant flowing portion, thereby preventing the through-hole from being opened.
[88]
6 is an enlarged vertical cross-sectional view of a battery module in which a sealing member is added to a grooved heat sink.
[89]
Referring to FIG. 6 , the refrigerant flowing part 320 is formed between the upper plate 110 and the heat sink 310 , and a sealing member 340 is added to the through hole of the heat sink 310 .
[90]
The sealing member 340 includes an extension part 341 , and a groove 314 is formed in a portion where the extension part 341 is formed among the inner surface 311 and the outer surface 312 of the heat sink.
[91]
A portion of the sealing member constituting the extended portion 341 is inserted into the groove 314 to form the insertion portion 345 , and the sealing member is removed by the water pressure of the coolant to more effectively prevent the opening of the through hole can do.
[92]
In order to manufacture the sealing member including the extension part as described above, an insert injection method in which a resin for the sealing member is imported and manufactured for the heat sink in which the groove is formed may be used. Alternatively, a portion of the sealing member passing through the through hole is prepared by preparing a central portion of the sealing member having a shape and size corresponding to the shape and size of the through hole, and adding a separate member to the central portion of the sealing member to form an extension. can At this time, the coupling method of the extension part added separately from the central part of the sealing member is not limited, such as bonding by an adhesive material, screw fastening, and force fitting method. In addition, the central portion of the sealing member may be made of a thermoplastic polymer resin that is melted at a high temperature, and the material of the separately added extension part may be made of a material that does not melt at a high temperature.
[93]
7 is a vertical cross-sectional view illustrating a state in which a sealing member is added to a grooved heat sink.
[94]
Referring to FIG. 7 , sealing members 440 , 540 , and 640 are added to each of the heat sinks 410 , 510 , and 610 .
[95]
Each of the heat sinks 410, 510, and 610 has grooves 414, 514, and 614 formed in portions meeting the extension, and inserts 445. 545. 645 in the grooves 414, 514, and 614. this is formed
[96]
The vertical cross-section of the portion in which the grooves 414, 514, 614 are formed in the heat sink (410, 510, 610) is in any one or more shapes selected from the group consisting of polygons, semi-circles, and semi-ellipses including triangles, trapezoids, etc. may be formed, and they may be formed by mixing.
[97]
Referring to FIG. 7C , the thickness of the central portion 641 of the sealing member 640 is thinner than the thickness of the central portion of the sealing member 410 and the thickness of the central portion of the sealing member 510 . In this way, when the thickness of the portion sealing the through-hole is formed to be relatively thin, the time until the sealing member is melted and the through-hole is opened can be shortened, so that the refrigerant can be quickly supplied to the battery cell. .
[98]
8 is a vertical cross-sectional view of a battery pack according to another exemplary embodiment.
[99]
Referring to FIG. 8 , the battery module housing includes an upper plate 110 ′ and a lower plate 120 ′, and a battery cell stack in which pouch-type battery cells 101 are stacked is accommodated.
[100]
A water tank 260 functioning as a heat dissipation member is coupled to the inner surface of the upper plate 110 ′. The water tank 260 includes a first surface 261 coupled to the inner surface of the upper plate 110 ′, and a second surface 263 facing the first surface 261 , and the first surface 261 . ) and the cooling water 262 is accommodated in the space formed between the second surface 263 .
[101]
A through hole 267 is formed in the second surface 263 , and a sealing member 268 is added to the through hole 267 .
[102]
The sealing member 268 is made of a material that is melted in the high-temperature gas or sparks released by the pouch-type battery cell 101 open. When the pouch-type battery cell is heated or ignited, the sealing member 268 melts and penetrates. When the sphere 267 is opened, cooling water 262 is directly injected into the ignited pouch-type battery cell 101 so that the ignited pouch-type battery cell can be cooled and extinguished.
[103]
The water tank 260' includes a first surface 261' coupled to the inner surface of the lower plate 120', and a second surface 263' facing the first surface 261', the first The cooling water 262' is accommodated in the space formed between the surface 261' and the second surface 263'.
[104]
A through hole 267' is formed in the second surface 263', and a sealing member 268' is added to the through hole 267'.
[105]
Melting of the sealing member 268 ′ due to venting or ignition of the pouch-type battery cell 101 and the effect thereof are applied in the same manner as described for the water tank 268 .
[106]
9 is a front view schematically illustrating a manufacturing process of the heat sink, and FIG. 10 is a front view schematically illustrating a process of adding a sealing member to the heat sink.
[107]
A method of manufacturing the heat dissipation member included in the battery module according to the present invention will be described with reference to FIGS. 9 and 10 .
[108]
Specifically, the method for manufacturing the heat dissipation member includes the steps of (a) arranging a flat plate for a heat sink of the heat dissipation member between a die and a holder, (b) punching the flat plate using a punching machine to form a through hole to manufacture a heat sink Step, (c) mounting the heat sink to a mold for insert extrusion molding, (d) fixing the heat sink to the mold and injecting a resin for a sealing member, and (e) removing the mold and sealing member and collecting the added heat sink, and protrusions for forming grooves in the heat sink may be formed on the die and the holder.
[109]
9 and 10 show a process of manufacturing the heat sink 410 shown in FIG. ) and the holder 720 , and punching using a punching machine 730 at a position where the through hole is to be formed to form the through hole, the heat sink 410 may be manufactured. The cut portion 217 cut by the puncher 730 is removed.
[110]
Protrusions 711 and 721 are formed in each of the die 710 and the holder 720 , and grooves 414 having a size corresponding to the shapes of the protrusions 711 and 721 are formed in the heat sink 410 .
[111]
As a method of molding the sealing member 440 on the heat sink 410 , an insert extrusion molding method may be used, and the heat sink 410 is disposed between the upper frame 801 and the lower frame 802 . Thereafter, the resin 447 for the sealing member is injected through the injection hole 811 formed in the upper frame 801 . When the resin 447 for the sealing member is dried, the heat sink 410 to which the sealing member 440 is added is formed in the form of an inner space formed between the upper frame 801 and the lower frame 802 . Since a portion of the sealing member is inserted into the heat sink 410 into the groove 414 , the sealing member 440 can be stably fixed to the heat sink 410 .
[112]
The heat dissipation plate manufactured in this way is coupled to the upper plate and the lower plate of the battery module housing with a space therebetween, so that a heat dissipation member having a structure in which a refrigerant flows in and out of the space can be manufactured.
[113]
In addition, the heat sink may constitute a water tank coupled to the upper plate and the lower plate of the battery module housing, and the heat sink may constitute the other side facing one side of the water tank coupled to the upper plate and the lower plate.
[114]
As described above, when using the battery module according to the present invention and the method for manufacturing a heat dissipation member included in the battery module, it is possible to rapidly cool the ignited battery cells, thereby providing a battery module with improved safety.
[115]
Those of ordinary skill in the art to which the present invention pertains will be able to perform various applications and modifications within the scope of the present invention based on the above contents.
[116]
(Explanation of symbols)
[117]
100: battery module
[118]
101, 103: pouch-type battery cell
[119]
102: electrode lead
[120]
110, 110': top plate
[121]
120, 120': lower plate
[122]
130: side plate
[123]
200, 200': heat dissipation member
[124]
210, 310, 410, 510, 610: heat sink
[125]
211, 311: the inner surface of the heat sink
[126]
212, 312: the outer surface of the heat sink
[127]
215: bulkhead
[128]
217: cut part
[129]
220, 320: refrigerant flow part
[130]
230, 230', 230'', 267, 267': through hole
[131]
240, 268, 268', 340, 440, 540, 640: sealing member
[132]
241, 341: extension
[133]
260, 260': water tank
[134]
261, 261': first page
[135]
262, 262': coolant
[136]
263, 263': page 2
[137]
314, 414, 514, 614: home
[138]
345, 445, 545, 645: insert
[139]
390: heat transfer material [140]
401: flat plate for heat sink
[141]
447: resin for sealing member;
[142]
641: central sealing member
[143]
710: die
[144]
720: holder
[145]
730: punching machine
[146]
711, 721: projection
[147]
801: upper frame
[148]
802: lower frame
[149]
811: inlet
[150]
a: in the width direction of the upper plate
[151]
L: longitudinal direction of the battery cell
Industrial Applicability
[152]
As described above, the battery module according to the present invention can rapidly cool a ignited battery cell by changing the structure of a heat dissipation member used in the past without adding a separate additional configuration, thereby increasing the volume of the battery module It is possible to reliably suppress the thermal runaway phenomenon of the battery cell while minimizing the
[153]
In addition, when the sealing member added to the heat dissipation member is melted due to the high temperature of the battery cell, the coolant is directly injected from the heat dissipation member into the battery cell, so that the temperature of the battery cell can be quickly lowered.
[154]
In addition, since a through hole is formed in the heat dissipation member and a sealing member is added to the through hole to seal the through hole, the weight increase of the battery module can be minimized despite the addition of a fire extinguishing structure.
[155]
In addition, even if any one of the battery cells constituting the battery cell stack is vented, the heat dissipation member is used to inject a refrigerant thereto. can be obtained
[156]
In addition, since water is injected into the battery cell instead of an expensive fire extinguishing agent, production costs can be reduced.
Claims
[Claim 1]
a battery cell stack in which a plurality of pouch-type battery cells are stacked; a battery module housing accommodating the battery cell stack; and a heat dissipation member coupled to a portion of the battery module housing. A battery module including, wherein the heat dissipation member has a through hole formed in a heat sink facing the battery cell stack, and a sealing member is added to the through hole.
[Claim 2]
According to claim 1, wherein the battery module housing comprises an upper plate and a lower plate, the heat dissipation member comprises a heat sink and a refrigerant flow portion, the upper plate and A battery module to which the heat sink is coupled.
[Claim 3]
The battery module according to claim 2, wherein the heat dissipation member is coupled to the lower plate and the heat dissipation plate in such a way that a refrigerant flowing portion is formed between the lower plate and the heat dissipation plate.
[Claim 4]
The battery module according to claim 1, wherein the sealing member is made of a material melted by a high-temperature gas or sparks emitted from the pouch-type battery cell.
[Claim 5]
The battery module according to claim 4, wherein the through-hole is opened by melting of the sealing member, and the refrigerant is injected into the pouch-type battery cell through the through-hole.
[Claim 6]
The battery module according to claim 5, wherein the refrigerant is cooling water, and the cooling water does not contain a combustible material.
[Claim 7]
The battery module according to claim 6, wherein a flow path for guiding the flow of the cooling water is formed in the upper plate and the lower plate.
[Claim 8]
According to claim 1, wherein the battery module housing includes an upper plate and a lower plate, a water tank is coupled as the heat dissipation member to the inner surface of the upper plate, in the water tank, coupled to the inner surface of the upper plate A battery module in which a through hole is formed on a second surface facing the first surface, and a sealing member is added to the through hole.
[Claim 9]
The first battery module housing according to claim 1, wherein the battery module housing includes an upper plate and a lower plate, and a water tank is coupled to an inner surface of the lower plate as the heat dissipation member, and in the water tank, the first coupled to the inner surface of the lower plate. A battery module in which a through hole is formed on a second surface facing the surface, and a sealing member is added to the through hole.
[Claim 10]
According to claim 1, wherein the through hole is formed at a position where the supply of cooling water to the ignited pouch-type battery cell is possible even if any pouch-type battery cell ignites, and the through hole according to the number and size of the pouch-type battery cell A battery module in which the number of spheres is determined.
[Claim 11]
The battery module according to claim 1, wherein the sealing member fills the through hole, and includes an extension further extending outwardly from the periphery of the through hole on the inner and outer surfaces of the heat sink.
[Claim 12]
The battery module according to claim 11, wherein a groove is formed in a portion where the extension portion is formed among the inner surface of the heat sink and the outer surface of the heat sink.
[Claim 13]
The battery module according to claim 12, wherein the vertical cross-section of the heat sink having the grooves is formed in any one or more shapes selected from the group consisting of polygons, semi-circles, and semi-ovals.
[Claim 14]
A method of manufacturing a heat dissipation member included in the battery module according to any one of claims 1 to 13, comprising the steps of: (a) disposing a heat dissipation plate of the heat dissipation member between the die and the holder; (b) manufacturing a heat sink by punching the flat plate to form a through hole; (c) mounting the heat sink to a mold for insert extrusion molding; (d) fixing the heat sink to the frame and injecting a resin for a sealing member; and (e) removing the frame and collecting the heat sink to which the sealing member is added; A method of manufacturing a heat dissipating member including, in the die and holder, a protrusion for forming a groove in the heat dissipation plate.
[Claim 15]
15. The method of claim 14, wherein the heat dissipation plate is coupled to the upper plate and the lower plate of the battery module housing with a space therebetween, and a refrigerant flow part through which the refrigerant flows in and out is formed in the spaced apart space.
[Claim 16]
15. The method of claim 14, wherein the heat sink constitutes a water tank coupled to the upper and lower plates of the battery module housing, and the heat sink is disposed on the other side facing one side of the water tank coupled to the upper and lower plates A method of manufacturing a heat dissipation member.