Battery pack

Abstract

To provide a battery pack including a bus bar with a suitable shape for connecting between bus bar modules in a case of employing a bus bar module structure in a Cell-to-Pack structure.SOLUTION: A third bus bar 200 employed in this battery pack includes a first region 210 electrically connected to a first battery cell and existing on a first bus bar module side, a second region 220 electrically connected to a second battery cell and existing on a second bus bar module side, and a third region 230 provided at a position bridging the first bus bar module and the second bus bar module and connecting the first region 210 and the second region 220.SELECTED DRAWING: Figure 7

Description

[Technical field]

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

[0002] China Utility Model No. 213782118 (Patent Document 1) discloses a cell-to-pack structure in which a stack containing multiple battery cells is stored directly in a case, without using end plates and bind bars (module structure) to restrain multiple battery cells. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] China Utility Model No. 213782118 Summary of the Invention [Problem to be solved by the invention]

[0004] In a structure in which a busbar module, formed by housing a plurality of busbars in a plate member and modularizing the busbar module, is mounted on a stack of a plurality of battery cells, the stack including the plurality of battery cells has internal busbars that connect adjacent battery cells within the same stack, and transition busbars that connect between the stacks.

[0005] In a structure in which a busbar module is mounted on top of a stack of multiple battery cells, the transition busbars that connect the busbar modules need to be designed to bridge the gap between the busbar modules, and therefore must be designed with an optimal shape, in comparison to the shape of the internal busbars.

[0006] An object of the present technology is to provide a battery pack including a bus bar having an optimal shape for connecting between bus bar modules when a bus bar module structure is adopted in a cell-to-pack structure. [Means for solving the problem]

[0007] The present technology provides the following battery pack.

[0008] [1] A first stack including a plurality of first battery cells aligned in a first direction; a second stack including a plurality of second battery cells adjacent to the first stack in a second direction perpendicular to the first direction and aligned in the first direction; a case having a side wall facing the first stack and the second stack in the first direction and housing the first stack and the second stack; a first bus bar electrically connecting the plurality of first battery cells, a first bus bar module housing the first bus bar and disposed on the first stack; a second bus bar electrically connecting the plurality of second battery cells, and a second bus bar module housing the second bus bar and disposed on the second stack; a third busbar arranged along a second direction to bridge between the first busbar module and the second busbar module, electrically connecting one of the first battery cells selected from the first stack and one of the second battery cells selected from the second stack, wherein the third busbar includes a first region electrically connected to the first battery cell and located on the first busbar module side, a second region electrically connected to the second battery cell and located on the second busbar module side, and a third region arranged at a position bridging between the first busbar module and the second busbar module, communicating between the first region and the second region.

[0009] [2] The battery pack described in [1], wherein one of the first battery cells selected from the first stack is located at the end facing the side wall, and one of the second battery cells selected from the second stack is located on the same side as one of the first battery cells selected from the first stack.

[0010] [3] The battery pack described in [1] or [2], wherein when viewed along a third direction perpendicular to the first direction and the second direction, the third region has a convex shape that is positioned higher than the first region and the second region.

[0011] [4] The battery pack described in any one of [1] to [3], further comprising a positioning mechanism inserted between the first stack and the second stack for positioning the first stack and the second stack in the X-axis direction, and the third region being located above the positioning mechanism. Effect of the Invention

[0012] According to the present technology, when a bus bar module structure is adopted in a cell-to-pack structure, it is possible to provide a battery pack including a bus bar having an optimal shape for connecting between the bus bar modules. [Brief description of the drawings]

[0013] [Figure 1] 1 is an exploded perspective view of a battery pack according to an embodiment; [Diagram 2] FIG. 2 is a perspective view of a battery cell according to an embodiment. [Diagram 3] FIG. 4 is a top view of a plate member of the bus bar module according to the embodiment. [Figure 4] FIG. 2 is a perspective view showing a structure around a bus bar of the bus bar module according to the embodiment. [Diagram 5] 4 is a plan view showing a structure of the bus bar module according to the embodiment before a third bus bar is provided. FIG. [Figure 6] 11 is a plan view showing the structure of the bus bar module according to the embodiment after a third bus bar is provided. FIG. [Figure 7] FIG. 4 is a perspective view showing a structure of a third bus bar according to the embodiment. [Figure 8] 4 is a partial enlarged view showing a positioning mechanism provided between a first laminate and a second laminate in the embodiment. [Figure 9]6 is a partial enlarged view of the vicinity of a top surface region of a third bus bar according to the embodiment. FIG. [Figure 10] FIG. 11 is a perspective view showing a third bus bar in another embodiment. [Figure 11] FIG. 11 is a perspective view showing a third bus bar in still another embodiment. [Figure 12] FIG. 11 is a perspective view showing a third bus bar in still another embodiment. [Figure 13] FIG. 11 is a perspective view showing a third bus bar in still another embodiment. [Figure 14] FIG. 11 is a perspective view showing a third bus bar in still another embodiment. [Figure 15] FIG. 11 is a perspective view showing a third bus bar in still another embodiment. [Figure 16] FIG. 11 is a perspective view showing a third bus bar in still another embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] 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.

[0015] 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.

[0016] 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.

[0017] 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).

[0018] 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 "battery pack" can be mounted in hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), battery electric vehicles (BEVs), and the like. However, the use of the "battery cell" is not limited to in-vehicle use.

[0019] Fig. 1 is an exploded perspective view of a battery pack 1. As shown in Fig. 1, the battery pack 1 includes a laminate 10 including a plurality of battery cells 100 (see Fig. 2) arranged in a Y-axis direction (first direction), a case 20 that houses the laminate 10, and a bus bar module 30 arranged on the laminate 10.

[0020] The laminate 10 includes a first laminate 10A, a second laminate 10B, and a third laminate 10C. The first laminate 10A and the second laminate 10B are adjacent to each other in the X-axis direction (second direction). The second laminate 10B and the third laminate 10C are adjacent to each other in the X-axis direction.

[0021] The case 20 has a side wall 21 that faces the first stack 10A, the second stack 10B, and the third stack 10C in the Y-axis direction. The side wall 21 directly supports the first stack 10A, the second stack 10B, and the third stack 10C from both sides in the Y-axis direction. In this manner, the battery pack 1 according to the present embodiment employs a cell-to-pack structure in which the stack 10 including the multiple battery cells 100 is stored directly in the case.

[0022] The busbar module 30 includes a first busbar module 30A arranged on the first laminate 10A, a second busbar module 30B arranged on the second laminate 10B, and a third busbar module 30C arranged on the third laminate 10C. The first busbar module 30A, the second busbar module 30B, and the third busbar module 30C have the same form in this embodiment, but may have different forms.

[0023] Fig. 2 is a perspective view showing the configuration of the battery cells 100 constituting the first stack 10A, the second stack 10B, and the third stack 10C. As shown in Fig. 2, the battery cells 100 have a rectangular shape. The battery cells 100 have an electrode terminal 110, a housing 120, and a gas release valve 130.

[0024] The electrode terminals 110 are formed on the housing 120. The electrode terminals 110 include a positive terminal 111 and a negative terminal 112 as two electrode terminals 110 arranged along an X-axis direction (second direction) perpendicular to a Y-axis direction (first direction). The positive terminal 111 and the negative terminal 112 are provided apart from each other in the X-axis direction.

[0025] The housing 120 has a substantially rectangular parallelepiped shape. An electrode body and an electrolyte (not shown) are accommodated in the housing 120. The housing 120 has an upper surface 121, a lower surface 122, a first side surface 123, a second side surface 124, and a third side surface 125.

[0026] The upper surface 121 is a plane perpendicular to the Z-axis direction. The electrode terminals 110 are disposed on the upper surface 121. The lower surface 122 faces the upper surface 121 along the Z-axis direction (third direction) perpendicular to the Y-axis direction (first direction) and the X-axis direction (second direction).

[0027] Each of the first side surface 123 and the second side surface 124 is formed of a plane perpendicular to the Y-axis direction. Each of the first side surface 123 and the second side surface 124 has the largest area among the multiple side surfaces of the housing 120. Each of the first side surface 123 and the second side surface 124 has a rectangular shape when viewed in the Y-axis direction. Each of the first side surface 123 and the second side surface 124 has a rectangular shape with the X-axis direction being the long side direction and the Z-axis direction being the short side direction when viewed in the Y-axis direction.

[0028] The multiple battery cells 100 are stacked such that the first side surfaces 123 and the second side surfaces 124 of the battery cells 100 adjacent to each other in the Y-axis direction face each other. As a result, the positive electrode terminals 111 and the negative electrode terminals 112 are arranged alternately in the Y-axis direction in which the multiple battery cells 100 are stacked.

[0029] Gas exhaust valve 130 is provided on upper surface 121. When the internal pressure of housing 120 increases to a predetermined value or higher due to gas generated inside housing 120, gas exhaust valve 130 opens and exhausts the gas to the outside of housing 120.

[0030] Next, the basic configuration of the busbar module 30 will be described with reference to Fig. 3 to Fig. 6. Fig. 3 is a top view of a plate member 310 included in the busbar module 30, Fig. 4 is a perspective view showing the structure around the busbar in the busbar module, Fig. 5 is a plan view showing the structure of the busbar module before third busbar 200 is provided, and Fig. 6 is a plan view showing the structure of the busbar module after third busbar 200 is provided.

[0031] Each of the first busbar module 30A, the second busbar module 30B, and the third busbar module 30C includes a plate member 310 shown in Fig. 3. As shown in Fig. 3, the plate member 310 includes an end face 311 located at the end in the Y-axis direction, an end face 312 located at the end in the X-axis direction, a through-hole 313 formed in a position corresponding to the gas release valve 130 of the battery cell 100, and a wall portion 314 that divides the space on the plate member 310 into multiple sections.

[0032] As shown in FIG. 4, in the first busbar module 30A, a busbar 320 (first busbar) is housed in each space partitioned by the wall portion 314. The busbar 320 (first busbar) is made of a conductor (typically, a metal member). The busbar 320 (first busbar) electrically connects the electrode terminals 110 of the multiple battery cells 100 to each other. The busbar 320 (first busbar) includes a root portion 321 extending in the Y-axis direction, and a connection portion 322 (first connection portion) and a connection portion 323 (second connection portion) protruding from the root portion 321 in the X-axis direction. The connection portions 322 and 323 are each connected to the electrode terminals 110 of two battery cells 100 adjacent to each other in the Y-axis direction.

[0033] Bus bar 320 is connected to wiring 410. Wiring 410 is fixed to bus bar 320 (first bus bar) by screws 420. The form of wiring 410 and screws 420 is not limited to that shown in Fig. 4, and the wiring may be formed by, for example, a flexible wiring board.

[0034] The electrode terminals 110 and the busbars 320 (first busbars) of the battery cells 100 are welded together after being positioned relative to each other in the X-axis and Y-axis directions. By performing this positioning accurately, the welding process between the electrode terminals 110 and the busbars 320 (first busbars) can be performed with high efficiency and high quality.

[0035] 4, in second busbar module 30B, similar to first busbar module 30A, busbars 320 (second busbars) are stored in each space partitioned by wall portion 314. Busbar 320 (second busbar) has the same configuration and function as busbar 320 (first busbar).

[0036] 4, a third busbar 200 is provided along the X-axis direction so as to bridge between the first busbar module 30A and the second busbar module 30B, and electrically connects one battery cell 100 (first battery cell) selected from the first stack 10A and one battery cell 100 (second battery cell) selected from the second stack 10B. Although not shown in the figure, a third busbar 200 is also provided between the second busbar module 30B and the third busbar module 30C.

[0037] In this embodiment, one battery cell 100 (first battery cell) selected from the first stack 10A is a battery cell located at the end (the very end in the Y-axis direction) facing the side wall 21, and one battery cell 100 (second battery cell) selected from the second stack 10B is a battery cell located on the same side (the very end in the Y-axis direction and adjacent in the X-axis direction) as the one battery cell 100 (first battery cell) selected from the first stack 10A. Note that the position at which the third bus bar 200 is provided is not limited to the position shown in the figure.

[0038] As shown in Fig. 5, before the third busbar 200 is provided, the negative electrode terminals 112 of the battery cells 100 are exposed on the first busbar module 30A side, and the positive electrode terminals 111 of the battery cells 100 are exposed on the second busbar module 30B side. As shown in Fig. 6, by providing the third busbar 200, the negative electrode terminals 112 on the first busbar module 30A side and the positive electrode terminals 111 of the second busbar module 30B are electrically connected to each other.

[0039] Third bus bar 200 is connected to wiring 410. Wiring 410 is fixed to third bus bar 200 by screws 420. The form of wiring 410 and screws 420 is not limited to that shown in Fig. 4, and the wiring may be formed by, for example, a flexible wiring board.

[0040] The electrode terminals 110 of the battery cells 100 and the third bus bar 200 are welded together after being positioned relative to each other in the X-axis and Y-axis directions. By performing this positioning accurately, the welding process between the electrode terminals 110 and the third bus bar 200 can be performed with high efficiency and high quality.

[0041] Furthermore, the above-mentioned welding process of busbars 320 (first busbar, second busbar) to electrode terminals 110 and the welding process of third busbar 200 to electrode terminals 110 can be carried out consecutively in the same welding process, making it possible to improve the efficiency of the welding process. Furthermore, the third busbar 200 can be manufactured from the same material and with the same thickness as busbar 320 (first busbar, second busbar), making it possible to reduce the manufacturing cost of third busbar 200.

[0042] Next, a specific shape of third bus bar 200 will be described with reference to Fig. 7. Fig. 7 is a perspective view showing the structure of the third bus bar.

[0043] This third busbar 200 includes a first region 210 electrically connected to the battery cell 100 (first battery cell) and located on the first busbar module 30A side, a second region 220 electrically connected to the battery cell 100 (second battery cell) and located on the second busbar module 30B side, and a third region 230 located at a position bridging the gap between the first busbar module 30A and the second busbar module 30B, and connecting the first region 210 and the second region 220.

[0044] Furthermore, when the third busbar 200 is viewed along the Z-axis direction (third direction) perpendicular to the Y-axis direction (first direction) and the X-axis direction (second direction), the third region 230 has a convex shape located above the first region 210 and the second region 220.

[0045] Specifically, the third region 230 has a top surface portion 200a and a pair of first sidewall portions 200b extending downward on both sides of the top surface portion 200a in the X-axis direction.

[0046] The first region 210 has a bottom surface portion 200c, a second side wall portion 200d extending upward from one end of the bottom surface portion 200c, and an extension portion 200e extending parallel to the bottom surface portion 200c from an upper end of the second side wall portion 200d. A circular through hole 200h1 is provided in the bottom surface portion 200c, and a circular through hole 200h2 is provided in the extension portion 200e.

[0047] The second region 220 has a bottom surface portion 200c, a second side wall portion 200d extending upward from one end of the bottom surface portion 200c, and an extension portion 200e extending parallel to the bottom surface portion 200c from an upper end of the second side wall portion 200d, similar to the first region 210. A circular through hole 200h1 is provided in the bottom surface portion 200c, and a circular through hole 200h2 is provided in the extension portion 200e.

[0048] The through hole 200h1 is used when welding and joining the electrode terminal 110 and the bottom surface portion 200c of the battery cell 100. The through hole 200h2 is used when fastening the wiring 410 using a screw 420.

[0049] In the present embodiment, third bus bar 200 has extension portion 200e provided at a height position between bottom surface portion 200c and top surface portion 200a when viewed along the Z-axis direction (third direction).

[0050] Here, the effect of the configuration of third busbar 200 in this embodiment will be described with reference to Fig. 8 and Fig. 9. Fig. 8 is a partial enlarged view showing a positioning mechanism provided between first laminate 10A and second laminate 10B, and Fig. 9 is a partial enlarged view of the vicinity of top surface portion 200a region of third busbar 200.

[0051] In the present embodiment, a positioning mechanism 330 is provided between the first laminate 10A and the second laminate 10B. This positioning mechanism 330 is inserted between two adjacent laminates (between the first laminate 10A and the second laminate 10B in the example of FIG. 8) and has a positioning mechanism 330 for positioning the busbar module 30 in the X-axis direction. In the example of FIG. 8, the first laminate 10A has the positioning mechanism 330A, and the second laminate 10B has the positioning mechanism 330B.

[0052] The positioning mechanism 330 has an insertion portion 331 that is press-fitted between the first laminate 10A and the second laminate 10B. When the insertion portion 331 is press-fitted between the first laminate 10A and the second laminate 10B, the first busbar module 30A is biased in a direction away from the second laminate 10B. At this time, the insertion portion 331 abuts against a side surface of the first laminate 10A, thereby positioning the first busbar module 30A in the X-axis direction. The positioning mechanism 330B has a similar configuration, and when the insertion portion 331 is press-fitted between the first laminate 10A and the second laminate 10B, the second busbar module 30B is biased in a direction away from the first laminate 10A. At this time, the insertion portion 331 abuts against a side surface of the second laminate 10B, thereby positioning the second busbar module 30B in the X-axis direction.

[0053] In this way, when the positioning mechanism 330 is provided between the first laminate 10A and the second laminate 10B, it is expected that the end faces 312 of the nearby first busbar module 30A and second busbar module 30B will be higher in the Z-axis direction. In such a case, as shown in Fig. 8, the third region 230 of the third busbar 200 has a convex shape located above the first region 210 and the second region 220, which enables the first region 210 to climb over the end face 312 and bridge the gap between the first busbar module 30A and the second busbar module 30B.

[0054] Here, as shown in FIG. 9, if the distance from the bottom surface of the second bus bar module 30B to the lower surface of the top surface portion 200a is taken as h1, it is considered sufficient if the distance is about 3 mm to 10 mm.

[0055] (Other forms of third busbar) Other configurations of the third busbar will be described with reference to Figures 10 to 16. Figure 10 is a perspective view showing a third busbar 200A in another configuration, Figure 11 is a perspective view showing a third busbar 200B in yet another configuration, Figure 12 is a perspective view showing a third busbar 200C in yet another configuration, Figure 13 is a perspective view showing a third busbar 200D in yet another configuration, Figure 14 is a perspective view showing a third busbar 200E in yet another configuration, Figure 15 is a perspective view showing a third busbar 200F in yet another configuration, and Figure 16 is a perspective view showing a third busbar 200G in yet another configuration.

[0056] (Third bus bar 200A) 10, the third busbar 200A differs from the third busbar 200 shown in FIG. 7 in the shape of the through-holes provided in the busbar. Instead of the circular through-hole 200h1 provided in the third busbar 200, the bottom surface portion 200c located in the first region 210 of the third busbar 200A is provided with a rectangular through-hole 200h4 with its long side in the Y-axis direction, and further, a pair of notched holes 200h5 extending outward along the Y-axis direction are provided on the short side of the through-hole 200h4. The bottom surface portion 200c located in the second region 220 of the third busbar 200A is provided with only the through-hole 200h4. The extension portion 200e of the first region 210 and the second region 220 is provided with a through-hole 200h6 in a Bodhidharma shape extending in a direction of approximately 45 degrees when viewed in the X-axis and Y-axis directions.

[0057] By making the through-holes in the bottom surface portion 200c rectangular or rectangular with a notched hole, it is possible to facilitate positioning and welding confirmation when welding the electrode terminals 110 of the battery cells 100 to the bottom surface portion 200c. By making the through-holes in the extension portion 200e shaped like a Daruma doll, the fastening position of the wiring 410 using the screws 420 can slide, which is expected to improve workability.

[0058] (Third bus bar 200B) 11, a major difference between third busbar 200B and third busbar 200 shown in Fig. 7 is that third busbar 200B is composed of two parts. First plate portion 210P located on the first region 210 side and second plate portion 220P located on the second region 220 side overlap in third region 230. Welded portion WP is provided at this overlapping location.

[0059] The bottom surface portion 200c located in the first region 210 is provided with a rectangular through hole 200h4 and a pair of cutout holes 200h5. The bottom surface portion 200c located in the second region 220 is provided with only the through hole 200h4. The extending portion 200e of the first region 210 and the second region 220 is provided with a circular through hole 200h6. By configuring the third bus bar 200B from two parts, it is possible to absorb dimensional tolerances.

[0060] (Third bus bar 200C) 12, a major difference between third busbar 200C and third busbar 200B shown in FIG. 11 is that third busbar 200C is also composed of two parts, and in third region 230, first plate portion 210P is provided with first extension portion 210a extending in the Y-axis direction, and second plate portion 220P is also provided with second extension portion 220a extending in the Y-axis direction. This makes it possible to expand the overlapping region between first plate portion 210P and second plate portion 220P in third region 230, and welded portions WP are provided at the overlapping portions between first extension portion 210a and second extension portion 220a. This configuration makes it possible to increase the path length of the busbar.

[0061] (Third bus bar 200D) Referring to Fig. 13, a major difference between third busbar 200D and third busbar 200B shown in Fig. 11 is that third busbar 200D is also made up of two parts, and first plate portion 210P and second plate portion 220P are fastened together in third region 230 using bolt B1 rather than welding. With this configuration as well, it is expected that the same effects as those of third busbar 200B can be obtained.

[0062] (Third bus bar 200E) 14, a major difference between third busbar 200E and the third busbar 200 shown in FIG. 7 is the shape of the through holes provided in first region 210 and second region 220. The through holes provided in first region 210 and second region 220 of third busbar 200E include first thin-walled portion 230h1 having an elliptical shape with its major axis positioned in the Y-axis direction, rectangular through hole 230h2 provided in first thin-walled portion 230h1 and with its longer side in the Y-axis direction, and circular through hole 230h3 provided so as to overlap the center of through hole 230h2. With this configuration as well, it is expected that the same effects as those of third busbar 200 can be obtained.

[0063] (3rd bus bar 200F) 15, a major difference between third busbar 200F and third busbar 200 shown in FIG. 7 is the shape of the through holes provided in first region 210 and second region 220. The through holes provided in first region 210 and second region 220 of third busbar 200F include a rectangular thin-walled portion 240h1 with its long side in the Y-axis direction, a rectangular through hole 240h2 provided in this thin-walled portion 240h1 with its long side in the Y-axis direction, and a notched hole 240h3 provided to extend from the center of through hole 240h2 in the X-axis direction. With this configuration as well, it is expected that the same effects as those of third busbar 200 can be obtained.

[0064] (3rd busbar 200G) 16, a major difference between third busbar 200G and third busbar 200 shown in FIG. 7 is the shape of the through holes provided in first region 210 and second region 220. The through holes provided in first region 210 and second region 220 of third busbar 200F include square-shaped thin-walled portion 250h1, circular-shaped through hole 250h2 provided in thin-walled portion 250h1 at a position shifted in the Y-axis direction, and notched hole 250h3 extending in the X-axis direction at a position shifted in the Y-axis direction from the center of through hole 250h2. With this configuration as well, it is expected that the same effects as those of third busbar 200 can be obtained.

[0065] The third bus bar may be formed by appropriately combining the bus bar, the thin portion, and the hole.

[0066] 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]

[0067] 1 battery pack, 10 laminate, 10A first laminate, 10B second laminate, 10C third laminate, 20 case, 21 side wall, 30 busbar module, 30A first busbar module, 30B second busbar module, 30C third busbar module, 100 battery cell, 110 electrode terminal, 111 positive terminal, 112 negative terminal, 120 housing, 121 upper surface, 122 lower surface, 123 first side surface, 124 second side surface, 125 third side surface, 130 gas exhaust valve, 200, 200A, 200B, 200C, 200D, 200E, 200F, 200G third busbar, 200a top surface, 200b first side wall portion, 200c bottom surface portion, 200d second side wall portion, 200e Extension portion, 200h1, 200h2, 200h4, 200h6, 230h2, 230h3, 240h2, 250h2, 313 Through hole, 200h5, 240h3, 250h3 Notch hole, 210 First region, 210P First plate portion, 210a First extension portion, 220 Second region, 220P Second plate portion, 220a Second extension portion, 230 Third region, 230h1 First thin portion, 240h1, 250h1 Thin portion, 310 Plate member, 311, 312 End face, 314 Wall portion, 320 Bus bar, 321 Base portion, 322, 323 Connection portion, 330, 330A, 330B Positioning mechanism, 331 Insertion portion, 410 Wiring, 420 screws.

Claims

1. A first stack including a plurality of first battery cells aligned in a first direction; a second stack adjacent to the first stack in a second direction perpendicular to the first direction and including a plurality of second battery cells aligned in the first direction; a case having side walls facing the first stack and the second stack in the first direction, the case housing the first stack and the second stack; a first bus bar electrically connecting a plurality of the first battery cells, and a first bus bar module that houses the first bus bar and is disposed on the first stack; a second bus bar electrically connecting the plurality of second battery cells, and a second bus bar module that houses the second bus bar and is disposed on the second stack; a third bus bar that is provided along the second direction so as to bridge between the first bus bar module and the second bus bar module and electrically connects one of the first battery cells selected from the first stack and one of the second battery cells selected from the second stack; and Equipped with The third bus bar is a first region electrically connected to the first battery cell and located on the first bus bar module side; a second region electrically connected to the second battery cell and located on the second bus bar module side; a third region provided at a position bridging the first bus bar module and the second bus bar module and communicating with the first region and the second region, Battery pack.

2. the first battery cell selected from the first stack is located at an end facing the side wall, The one second battery cell selected from the second stack is located on the same side as the one first battery cell selected from the first stack. The battery pack according to claim 1 .

3. When viewed along a third direction orthogonal to the first direction and the second direction, The third region has a convex shape located above the first region and the second region. The battery pack according to claim 1 .

4. a positioning mechanism that is inserted between the first stack and the second stack and that positions the first stack and the second stack in an X-axis direction; The third region is located above the positioning mechanism. The battery pack according to claim 1 .

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