Battery pack

Abstract

To improve the energy density of a battery pack while reducing the number of parts while providing the necessary functionality.SOLUTION: In a laminate 10, a plurality of battery cells 100 each having a square shape including a top surface 121, a bottom surface 122 opposite to the top surface 121, and a side surface 123 located between the top surface 121 and the bottom surface 122 are stacked along a first direction. In a housing 20, the bottom portion 200 facing the bottom surface 122 and a side wall portion 210 facing the side surface 123 are integrally molded. The bottom portion 200 includes a cooling mechanism 25 that can cool the laminate 10. The side wall portion 210 includes a shock absorption mechanism 26.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present technology relates to battery packs. [Background technology]

[0002] Japanese Patent Laid-Open Publication No. 2009-105007 (Patent Document 1) is a prior art document that discloses the configuration of a battery tray for an electric vehicle. The battery tray for an electric vehicle described in Patent Document 1 comprises a frame and a plurality of tray members. The plurality of tray members are assembled within the confines of the frame, and are provided with storage sections for mounting batteries. The plurality of tray members are joined to one another by welding. The plurality of tray members and the frame are joined by welding. The frame and the tray members are provided with engagement means. Furthermore, the tray members are provided with a hollow section, which may be used as an area for wiring cables.

[0003] A prior art document disclosing the configuration of a battery case is Chinese Utility Model No. 208189687 (Patent Document 2). The battery case described in Patent Document 2 includes a lower case. The lower case includes a lower case left bottom plate and a lower case right bottom plate. The lower case left bottom plate and the lower case right bottom plate are joined by welding or the like. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2009-105007 A [Patent Document 2] China Utility Model No. 208189687 Summary of the Invention [Problem to be solved by the invention]

[0005] The housing for housing the battery cells described in Patent Document 1 has other functions in addition to the function of housing the battery cells, such as connecting components to each other or inserting one component into another. Because these functions are provided in separate components, the housing has a large number of components.

[0006] In addition, in the casings described in Patent Documents 1 and 2, when the casing is composed of multiple parts, the parts are joined together by joints. When providing these joints, clearances are provided around the joints to form the joints. Since it is necessary to make the casing larger by the amount of clearance provided, the energy density of the battery pack is reduced.

[0007] The present technology has been made to solve the above-mentioned problems, and has an object to provide a battery pack that has necessary functions, reduces the number of parts, and improves energy density. [Means for solving the problem]

[0008] The present technology provides the following battery pack. [1] a stack in which a plurality of battery cells are stacked in a first direction, each battery cell having a rectangular shape including a top surface, a bottom surface opposite to the top surface, and a side surface located between the top surface and the bottom surface; a housing having a bottom portion opposed to the bottom surface and a side wall portion opposed to the side surface integrally formed therewith, the bottom portion includes a cooling mechanism capable of cooling the stack; The side wall portion includes a shock absorbing mechanism. [2] The battery pack according to [1], wherein the cooling mechanism is provided inside the bottom portion and includes a cooling medium passage through which a cooling medium can flow. [3] The battery pack according to [2], wherein the cooling medium passage is arranged so as to overlap both the laminate and the side wall portion when viewed from a second direction in which the top surface and the bottom surface are opposed to each other. [4] The side wall portion has an internal space, the side wall portion has a rib disposed in the internal space and dividing the internal space into a plurality of regions; The battery pack according to any one of [1] to [3], wherein the shock absorbing mechanism is constituted by the internal space and the rib. [5] The battery pack according to any one of [1] to [4], wherein the side wall portion faces a battery cell located at an end of the plurality of battery cells in the first direction. [6] the side surface includes a first side surface portion and a second side surface portion disposed opposite each other in a third direction perpendicular to the first direction, the bottom surface includes a first portion located on a side of the first side surface portion from a center of the bottom surface and a second portion located on a side of the second side surface portion from the center, The housing includes: a first housing member having a first bottom portion opposed to the first portion and a first side wall portion disposed opposite to the first side portion integrally formed therewith; a second housing member having a second bottom portion opposed to the second portion and a second side wall portion disposed opposite to the second side portion integrally formed therewith; The battery pack described in any one of [1] to [5], wherein the first housing member and the second housing member have ends of the first bottom and the second bottom joined together. [7] The battery pack according to [6], wherein the first housing member and the second housing member are formed by extrusion molding. Effect of the Invention

[0009] According to this technology, the number of parts can be reduced while maintaining the necessary functions by forming a housing by integrally molding a bottom having a cooling mechanism and a side wall having a shock absorbing mechanism. In addition, by integrally molding the bottom and side wall of the housing, it is not necessary to provide a joint between the bottom and the side wall, so there is no need to provide a clearance inside the housing that is required when forming the joint. This makes it possible to reduce the size of the housing by the amount of the reduced clearance, thereby improving the energy density of the battery pack. [Brief description of the drawings]

[0010] [Figure 1] 1 is a perspective view showing a configuration of a battery pack according to a first embodiment of the present technology. [Diagram 2] 1 is a perspective view showing a configuration of a battery cell and a separator according to a first embodiment of the present technology. [Diagram 3] 1 is a perspective view showing a configuration of a battery cell according to a first embodiment of the present technology. [Figure 4] 4 is a cross-sectional view of the battery pack of FIG. 1 as viewed from the direction of the arrows IV-IV. [Diagram 5] FIG. 4 is a cross-sectional view showing the configuration of a battery pack according to a comparative example. [Figure 6] 11 is a cross-sectional view showing a configuration of a battery pack according to a second embodiment of the present technology. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, embodiments of the present technology will be described. Note that the same or corresponding parts are denoted by the same reference characters, and description thereof will not be repeated.

[0012] In the embodiments described below, when referring to the number, amount, etc., the scope of the present technology is not necessarily limited to the number, amount, etc., unless otherwise specified. In addition, in the following embodiments, each component is not necessarily essential to the present technology, unless otherwise specified. In addition, the present technology is not necessarily limited to those that achieve all of the effects and advantages mentioned in the present embodiment.

[0013] In this specification, the words "comprise", "include" and "have" are open-ended, i.e., when a certain configuration is included, other configurations may or may not be included.

[0014] Furthermore, when geometric terms and terms expressing positional and directional relationships, such as "parallel," "orthogonal," "45° diagonal," "coaxial," and "along" are used in this specification, these terms allow for manufacturing errors and slight variations. When terms expressing relative positional relationships, such as "upper side" and "lower side," are used in this specification, these terms are used to indicate relative positional relationships in one state, and the relative positional relationships can be inverted or rotated to any angle depending on the installation direction of each mechanism (for example, by turning the entire mechanism upside down).

[0015] In this specification, the term "battery" is not limited to lithium ion batteries, but may include other batteries such as nickel-metal hydride batteries and sodium ion batteries. In this specification, the term "electrode" may collectively refer to a positive electrode and a negative electrode.

[0016] The "battery pack" can be installed in hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), and battery electric vehicles (BEVs), etc. However, the use of the "battery pack" is not limited to being installed in vehicles.

[0017] In the drawings, the direction in which multiple battery cells are stacked is the first direction, or Y direction, the direction in which the top and bottom surfaces of the battery cells face each other is the second direction, or Z direction, and the direction in which the first and second side portions of the battery cells face each other is the third direction, or X direction.

[0018] (Embodiment 1) Fig. 1 is a perspective view showing a configuration of a battery pack according to a first embodiment of the present technology, Fig. 2 is a perspective view showing a configuration of a battery cell and a separator according to the first embodiment of the present technology.

[0019] 1 and 2, a battery pack 1 according to a first embodiment of the present technology includes a stack 10 and a housing 20. The stack 10 includes a plurality of battery cells 100, an inter-cell separator 101, and an end separator 102.

[0020] The multiple battery cells 100 are stacked along a first direction (Y direction). In this embodiment, the multiple battery cells 100 are stacked along the first direction (Y direction) with inter-cell separators 101 interposed between the battery cells 100. The inter-cell separators 101 are insulating plates.

[0021] The end separators 102 are insulating plates. The end separators 102 are provided so as to be located at both ends in a first direction (Y direction) of the stack 10. The multiple battery cells 100 are sandwiched between the end separators 102 in the first direction (Y direction).

[0022] The housing 20 houses the laminate 10. The housing 20 is made of, for example, aluminum or steel. The housing 20 in this embodiment is made up of five parts. The housing 20 includes a first housing member 21, a second housing member 22, a third housing member 23, a fourth housing member 24, and a cover member (not shown).

[0023] The first to fourth housing members 21 to 24 are joined together at their contacting locations. A cover member is provided on the first to fourth housing members 21 to 24 so as to cover the stacked body 10 from above.

[0024] The housing 20 restrains the stacked body 10 in the first direction (Y direction). In the present embodiment, the stacked body 10 is sandwiched in the first direction (Y direction) by the third housing member 23 and the fourth housing member 24 of the housing 20, thereby being restrained.

[0025] The stacked battery cells 100 are inserted into the housing 20 while a compressive force in a first direction (Y direction) is applied to them, and then the compressive force is released, causing a tensile force to act on the first housing member 21 and the second housing member 22 connecting the third housing member 23 and the fourth housing member 24. In reaction to this, the first housing member 21 and the second housing member 22 press the third housing member 23 and the fourth housing member 24 in a direction that brings them closer to each other. As a result, the housing 20 restrains the stack 10 in the Y direction. Other configurations of the housing 20 will be described later.

[0026] Fig. 3 is a perspective view showing a configuration of a battery cell according to embodiment 1 of the present technology. As shown in Fig. 3, the battery cell 100 is, for example, a lithium ion battery. The battery cell 100 has a rectangular shape.

[0027] The battery cell 100 according to this embodiment has an electrode terminal 110, a case body 120, and a gas release valve .

[0028] The electrode terminals 110 are formed on the case body 120. The electrode terminals 110 include a positive electrode terminal 111 and a negative electrode terminal 112 as two electrode terminals 110 arranged side by side in the third direction (X direction).

[0029] The case body 120 has a rectangular parallelepiped shape and forms the external appearance of the battery cell 100. The case body 120 contains an electrode assembly and an electrolyte, not shown.

[0030] Case body 120 has a top surface 121, a bottom surface 122, and a side surface 123. Top surface 121 is a flat surface perpendicular to the Z direction. Electrode terminals 110 are provided on top surface 121. Bottom surface 122 faces top surface 121 along a second direction (Z direction). Side surface 123 is located between top surface 121 and bottom surface 122.

[0031] The side surface 123 has a first side surface portion 124 , a second side surface portion 125 , a third side surface portion 126 and a fourth side surface portion 127 .

[0032] The first side surface portion 124 and the second side surface portion 125 are disposed opposite each other in a third direction (X direction) perpendicular to the first direction (Y direction). When viewed from the X direction, the first side surface portion 124 and the second side surface portion 125 have a rectangular shape with the Z direction as the longitudinal direction and the Y direction as the lateral direction.

[0033] The third side surface portion 126 and the fourth side surface portion 127 are made of planes perpendicular to the Y direction. The third side surface portion 126 and the fourth side surface portion 127 have the largest areas among the multiple side surfaces of the case body 120. When viewed in the Y direction, the third side surface portion 126 and the fourth side surface portion 127 have a rectangular shape with the X direction as the longitudinal direction and the Z direction as the lateral direction.

[0034] The bottom surface 122 has a first portion 128 and a second portion 129. The first portion 128 is located on the first side surface portion 124 side from the center of the bottom surface 122. The second portion 129 is located on the second side surface portion 125 side from the center of the bottom surface 122.

[0035] The multiple battery cells 100 are stacked such that the third side surface portions 126 and the fourth side surface portions 127 face each other between the battery cells 100, 100 adjacent to each other in the Y direction. As a result, the positive electrode terminals 111 and the negative electrode terminals 112 are arranged alternately in the Y direction in which the multiple battery cells 100 are stacked.

[0036] Gas exhaust valve 130 is provided on upper surface 121. When the internal pressure of case body 120 becomes equal to or greater than a predetermined value due to gas generated inside case body 120, gas exhaust valve 130 exhausts the gas to the outside of case body 120.

[0037] Fig. 4 is a cross-sectional view of the battery pack as viewed from the direction of the arrows IV-IV in Fig. 1. As shown in Fig. 4, the housing 20 includes a bottom portion 200 and a side wall portion 210.

[0038] In the present embodiment, each of the first housing member 21 and the second housing member 22 of the housing 20 includes a bottom portion 200 and a side wall portion 210. Specifically, the first housing member 21 has a first bottom portion 201 and a first side wall portion 211. The second housing member 22 has a second bottom portion 202 and a second side wall portion 212.

[0039] The bottom portion 200 faces the bottom surface 122 of the battery cell 100. In this embodiment, the first bottom portion 201 faces the first portion 128. The second bottom portion 202 faces the second portion 129.

[0040] The side wall portion 210 faces the side surface 123 of the battery cell 100. In the present embodiment, the first side wall portion 211 faces the first side surface portion 124. The second side wall portion 212 faces the second side surface portion 125.

[0041] The housing 20 has a bottom 200 and a side wall 210 integrally formed. In the present embodiment, the first housing member 21 has a first bottom 201 and a first side wall 211 integrally formed. The second housing member 22 has a second bottom 202 and a second side wall 212 integrally formed.

[0042] The first housing member 21 and the second housing member 22 are formed by extrusion molding. However, the first housing member 21 and the second housing member 22 are not limited to being formed by extrusion molding, and may be formed by casting or the like.

[0043] The first housing member 21 and the second housing member 22 are joined at the ends of the first bottom portion 201 and the second bottom portion 202. As a result, a connection portion 27 is formed between the first bottom portion 201 and the second bottom portion 202. The connection portion 27 is formed by, for example, friction stir welding. Note that the connection portion 27 may be formed by other joining methods such as arc welding.

[0044] The bottom portion 200 includes a cooling mechanism 25 capable of cooling the stacked body 10. The cooling mechanism 25 is provided inside the bottom portion 200. In the present embodiment, one cooling mechanism 25a is provided inside the first bottom portion 201. The other cooling mechanism 25b is provided inside the second bottom portion 202.

[0045] The cooling mechanism 25 includes a cooling medium passage 203 through which a cooling medium can flow. A plurality of cooling medium passages 203 are provided at intervals inside the bottom 200. In the present embodiment, one cooling medium passage 203a is located inside the first bottom 201. The other cooling medium passage 203b is located in the second bottom 202.

[0046] The cooling medium passage 203 is disposed so as to overlap both the stack 10 and the side wall portion 210 when viewed from a second direction (Z direction) in which the top surface 121 and the bottom surface 122 face each other. The cooling medium circulated through the cooling medium passage 203 is, for example, cooling water.

[0047] If the bottom 200 and the sidewall 210 are joined by welding or the like, other configurations such as a cooling mechanism are not arranged around the joined area in order to reduce the influence of the joining. In this embodiment, the area around the joined area of ​​the bottom 200 and the sidewall 210 includes a portion of the bottom 200 at a position overlapping with the sidewall 210 when viewed from the second direction (Z direction). For this reason, when the bottom 200 and the sidewall 210 are joined, other configurations such as a cooling mechanism are not arranged around the portion of the bottom 200 at a position overlapping with the sidewall 210 when viewed from the second direction (Z direction).

[0048] On the other hand, in the housing 20 of the present embodiment, the bottom 200 and the side wall 210 are integrally formed, and therefore the bottom 200 and the side wall 210 are not joined by welding or the like. This makes it possible to dispose the cooling mechanism 25 in a portion of the bottom 200 at a position overlapping with the side wall 210 when viewed from the second direction (Z direction). This makes it possible to improve the occupancy rate of the cooling medium passages 203 in the bottom 200, and therefore makes it possible to efficiently cool the battery cells 100.

[0049] The side wall portion 210 includes a shock absorbing mechanism 26. In this embodiment, one shock absorbing mechanism 26a is provided on the first side wall portion 211, and the other shock absorbing mechanism 26b is provided on the second side wall portion 212.

[0050] An internal space 213 is provided in the side wall portion 210. The side wall portion 210 has ribs 214. The ribs 214 are disposed in the internal space 213 and divide the internal space 213 into a plurality of regions. In this manner, the shock absorbing mechanism 26 is formed by the internal space 213 and the ribs 214. When an external impact is applied to the side wall portion 210, the shock absorbing mechanism 26 collapses to absorb the energy of the impact, thereby reducing the impact on the battery cell 100.

[0051] Although the shock absorbing mechanism 26 in this embodiment is configured by the internal space 213 and the ribs 214, the shock absorbing mechanism is not limited to this configuration. The shock absorbing mechanism may be configured by arranging a member that is more easily deformed than other parts in a part of the side wall portion 210, or by forming an internal space without ribs.

[0052] In the third direction (X direction), a gap L1 is provided between the battery cell 100 and the side wall portion 210. The width of the gap L1 may be such that there is no interference when the battery cell 100 is inserted into the housing 20. To increase the energy density, it is desirable for the gap L1 to be narrow.

[0053] Hereinafter, a battery pack according to a comparative example of the first embodiment of the present technology will be described. Since the battery pack according to the comparative example has a different housing configuration from the battery pack 1 according to the first embodiment of the present technology, the description of the configuration similar to that of the battery pack 1 according to the first embodiment of the present technology will not be repeated.

[0054] Fig. 5 is a cross-sectional view showing the configuration of a battery pack according to a comparative example. Although Fig. 5 shows only the first housing member, the same structure as the first housing member shown in Fig. 5 can be applied to the second housing member.

[0055] 5, in a battery pack 9 according to the comparative example, a first bottom 901 and a first side wall 911 in a first housing member 91 of a housing 90 are configured from separate members. The first bottom 901 and the first side wall 911 are joined by, for example, arc welding. A joint 92 is formed by arc welding. The joint 92 is formed at a corner between the first bottom 901 and the first side wall 911.

[0056] In this comparative example, the joint portion 92 protrudes from the first bottom portion 901 toward the battery cell 100, so the battery cell 100 cannot be placed directly above the joint portion 92. For this reason, the battery cell 100 according to the comparative example needs to be placed while avoiding the joint portion 92. Between the battery cell 100 and the first side wall portion 911 in the comparative example, a gap L2 is provided as a clearance required when forming the joint portion 92.

[0057] On the other hand, as shown in FIG. 4, in the battery pack 1 according to the present embodiment, the first bottom 201 and the first side wall 211 of the first housing member 21 are integrally formed, so that no joint such as an arc weld is interposed in the corner between the first bottom 201 and the first side wall 211. Therefore, the gap L1 according to the present embodiment can be made smaller than the gap L2 according to the comparative example. By making the gap L1 smaller than the gap L2, the housing 20 according to the present embodiment can be made smaller than the comparative example. As a result, the occupancy rate of the battery cells 100 in the battery pack 1 can be increased, and the energy density of the battery pack 1 can be improved.

[0058] In the battery pack 1 according to the first embodiment of the present technology, the housing 20 is configured by integrally molding the bottom 200 having the cooling mechanism 25 and the side wall 210 having the shock absorbing mechanism 26, so that the number of parts can be reduced while providing the necessary functions. Furthermore, by integrally molding the bottom 200 and the side wall 210, it is not necessary to provide a joint between the bottom 200 and the side wall 210, so that it is not necessary to provide a clearance required for forming the joint inside the housing 20. As a result, the housing 20 can be made smaller by the amount of the reduced clearance, and the occupancy rate of the battery cells 100 in the battery pack 1 can be increased, so that the energy density of the battery pack 1 can be improved.

[0059] In the battery pack 1 according to embodiment 1 of the present technology, the housing 20 is formed by integrally molding the bottom 200 and the side wall 210, thereby reducing the number of parts compared to a case in which the bottom and the side wall are not integrally molded, thereby making it possible to reduce the cost of the battery pack 1.

[0060] In the battery pack 1 according to the first embodiment of the present technology, the housing 20 is formed by integrally molding the bottom 200 and the side wall 210, so that the number of joints can be reduced compared to a case where the bottom and the side wall are not integrally molded. This prevents load from being applied to the joints, and makes it possible to give the housing 20 high strength or high rigidity.

[0061] In the battery pack 1 according to the first embodiment of the present technology, the housing 20 is formed by integrally molding the bottom 200 and the side wall 210, thereby minimizing the number of welding points compared to a case in which the bottom and the side wall are not integrally molded, and deformation of the housing 20 due to heat input during welding can be suppressed.

[0062] In the battery pack 1 relating to embodiment 1 of the present technology, the housing 20 is formed by integrally molding the bottom 200 and the side wall 210, so that the joint between the bottom 200 and the side wall 210 can be eliminated compared to a case in which the bottom and the side wall are not integrally molded, thereby improving the waterproofness of the housing 20.

[0063] In the battery pack 1 according to the first embodiment of the present technology, the cooling mechanism 25 is provided with the cooling medium passages 203 through which the cooling medium can flow, thereby making it possible to efficiently cool the battery cells 100.

[0064] In the battery pack 1 according to the first embodiment of the present technology, the bottom 200 and the side wall 210 are integrally molded, so that the cooling medium passage 203 can be provided directly below the side wall 210 in addition to directly below the battery cell 100 in the bottom 200. As a result, the range in the bottom 200 where the battery cell 100 can be cooled can be expanded, and the battery cell 100 can be cooled efficiently.

[0065] In the battery pack 1 relating to embodiment 1 of the present technology, the shock absorbing mechanism 26 is constituted by the internal space 213 and the rib 214, so that when an impact is applied to the side wall portion 210, the internal space 213 in which the rib 214 is arranged collapses, thereby absorbing the energy of the impact and reducing the impact on the battery cell 100.

[0066] In the battery pack 1 according to the first embodiment of the present technology, when the housing 20 becomes larger, a portion of the housing 20 can be made into two components, so that the bottom 200 and the side wall 210 can be integrally molded to accommodate the larger battery pack.

[0067] In the battery pack 1 according to the first embodiment of the present technology, the first housing member 21 and the second housing member 22 are extruded, whereby the components of the housing 20 can be manufactured efficiently.

[0068] (Embodiment 2) Hereinafter, a battery pack according to a second embodiment of the present technology will be described. Since the battery pack according to the second embodiment has a different housing configuration from the battery pack 1 according to the first embodiment of the present technology, the description of the configuration similar to that of the battery pack 1 according to the first embodiment of the present technology will not be repeated.

[0069] Fig. 6 is a cross-sectional view showing a configuration of a battery pack according to embodiment 2 of the present technology. As shown in Fig. 6, a housing 20A included in a battery pack 1A according to embodiment 2 includes a bottom portion 200A and a side wall portion 210A.

[0070] The side wall portion 210A faces the battery cell 100 located at the end in the first direction (Y direction) among the multiple battery cells 100. In the present embodiment, the side wall portion 210A faces the battery cell 100 with the end separator 102 sandwiched therebetween.

[0071] The first side wall portion 211A and the second side wall portion 212A are arranged to sandwich the stacked body 10, which is a plurality of battery cells 100, in the first direction (Y direction). The housing 20A restrains the stacked body 10 in the first direction (Y direction) by the first side wall portion 211A and the second side wall portion 212A. The first side wall portion 211A and the second side wall portion 212A are integrally formed with the bottom portion 200A.

[0072] In the battery pack 1A according to the second embodiment of the present technology, the bottom 200A and the side wall 210A are integrally molded, so that the housing 20A has high strength or high rigidity compared to a case in which there is a joint between the bottom and the side wall. By arranging the side wall 210A facing the battery cell 100 located at the end in the first direction (Y direction) among the multiple battery cells 100, the expansion of the battery cell 100 in the first direction (Y direction) can be received by the housing 20A.

[0073] In the above-described embodiments, the electrode terminals are provided on the upper surface of the battery cell, but the present invention is not limited to this configuration. The electrode terminals may be provided on the side surface of the battery cell. When the electrode terminals are provided on the side surface of the battery cell, a gap is provided between the side surface of the battery cell and the housing to ensure a space for arranging the electrode terminals.

[0074] Although the embodiment of the present technology has been described above, the embodiment disclosed herein should be considered as illustrative and not restrictive in all respects. The scope of the present technology is defined by the claims, and it is intended to include all modifications within the scope and meaning equivalent to the claims. [Explanation of symbols]

[0075] 1, 1A, 9 Battery pack, 10 Laminated body, 20, 20A, 90 Housing, 21, 91 First housing member, 22 Second housing member, 23 Third housing member, 24 Fourth housing member, 25, 25a, 25b Cooling mechanism, 26, 26a, 26b Impact absorbing mechanism, 27 Connection portion, 92 Joint portion, 100 Battery cell, 101 Inter-cell separator, 102 End separator, 110 Electrode terminal, 111 Positive electrode terminal, 112 Negative electrode terminal, 120 Case body, 121 Top surface, 122 Bottom surface, 123 Side, 124 First side portion, 125 Second side portion, 126 Third side portion, 127 Fourth side portion, 128 First portion, 129 Second portion, 130 Gas exhaust valve, 200, 200A Bottom, 201, 901 first bottom, 202 second bottom, 203, 203a, 203b cooling medium passage, 210, 210A side wall, 211, 211A, 911 first side wall, 212, 212A second side wall, 213 internal space, 214 rib.

Claims

1. a stack in which a plurality of battery cells are stacked in a first direction, each battery cell having a rectangular shape including a top surface, a bottom surface opposite to the top surface, and a side surface located between the top surface and the bottom surface; a housing having a bottom portion opposed to the bottom surface and a side wall portion opposed to the side surface, the housing being integrally formed with the bottom portion, the bottom portion includes a cooling mechanism capable of cooling the stack; The side wall portion includes a shock absorbing mechanism. the cooling mechanism includes a cooling medium passage provided inside the bottom portion and through which a cooling medium can flow; the cooling medium passage is arranged so as to overlap both the stack and the side wall portion when viewed from a second direction in which the top surface and the bottom surface face each other.

2. The side wall portion has an internal space, the side wall portion has a rib disposed in the internal space and dividing the internal space into a plurality of regions; The battery pack according to claim 1 , wherein the shock absorbing mechanism is formed by the internal space and the rib.

3. A laminate in which a plurality of battery cells, each having a rectangular shape including a top surface, a bottom surface opposite the top surface, and a side surface located between the top surface and the bottom surface, are stacked along a first direction; a housing having a bottom portion opposed to the bottom surface and a side wall portion opposed to the side surface, the housing being integrally formed with the bottom portion, the bottom portion includes a cooling mechanism capable of cooling the stack; The side wall portion includes a shock absorbing mechanism. the side wall portion faces a battery cell located at an end in the first direction among the plurality of battery cells, The side wall portion restrains the stack in the first direction.

4. the side surface includes a first side surface portion and a second side surface portion disposed opposite each other in a third direction perpendicular to the first direction, the bottom surface includes a first portion located on a side of the first side surface portion from a center of the bottom surface and a second portion located on a side of the second side surface portion from the center, The housing includes: a first housing member having a first bottom portion opposed to the first portion and a first side wall portion disposed opposite to the first side portion integrally formed therewith; a second housing member having a second bottom portion opposed to the second portion and a second side wall portion disposed opposite to the second side portion integrally formed therewith, The battery pack according to claim 1 , wherein the first housing member and the second housing member have ends of the first bottom portion and the second bottom portion joined to each other.

5. The battery pack according to claim 4 , wherein the first housing member and the second housing member are formed by extrusion molding.

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