Battery pack

Abstract

To provide a battery pack capable of simplifying a manufacturing process by accurately positioning a substrate case even in a Cell-to-Pack structure.SOLUTION: A battery pack includes a multilayer body including a plurality of battery cells arranged in a first direction, a case including a side wall facing the multilayer body from the first direction and accommodating the multilayer body, a bus bar module including a bus bar disposed on the multilayer body and electrically connecting the battery cells, and a plate member accommodating the bus bar, an electric appliance arranged beside the multilayer body along a second direction orthogonal to the first direction, and a substrate unit at least partially disposed on the bus bar module and including a substrate electrically connected to the multilayer body. The bus bar module includes a positioning mechanism for the substrate unit and the substrate unit is fastened to the electric appliance.SELECTED DRAWING: Figure 11

Description

[Technical Field]

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

[0002] As shown in Chinese Utility Model No. 213071279 (Patent Document 1) and Chinese Utility Model No. 213782118 (Patent Document 2), battery packs are beginning to adopt 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] Chinese Utility Model No. 213071279 [Patent Document 2] Chinese Utility Model No. 213782118 Summary of the Invention [Problem to be solved by the invention]

[0004] When positioning the substrate case relative to a stack of multiple battery cells, in a modular structure, for example, a bind bar can be used as a fixing part for positioning. However, in a cell-to-pack structure, there are no bind bars, so a different mechanism is required than in a modular battery pack.

[0005] The purpose of this technology is to provide a battery pack that can accurately position the substrate case even in a cell-to-pack structure, thereby simplifying the manufacturing process. [Means for solving the problem]

[0006] The present technology provides the following battery pack.

[0007] [1] A battery pack comprising: a stack including a plurality of battery cells arranged in a first direction; a case having side walls facing the stack from the first direction and housing the stack; a busbar module arranged on the stack and including busbars that electrically connect the plurality of battery cells and plate members that house the busbars; an electrical device arranged with the stack along a second direction that is perpendicular to the first direction; and a board unit, at least a portion of which is arranged on the busbar module and including a board that is electrically connected to the stack and the electrical device, wherein the busbar module has a positioning mechanism for the board unit.

[0008] [2] The battery pack according to [1], wherein the positioning mechanism includes a wall or hole extending in a third direction perpendicular to the first direction and the second direction.

[0009] [3] The battery pack according to [1] or [2], wherein the positioning mechanism positions the board unit in at least the second direction.

[0010] [4] A battery pack according to any one of [1] to [3], wherein the substrate unit is arranged so as to extend from above the busbar module to above the electrical equipment.

[0011] [5] The battery pack according to any one of [1] to [4], wherein the electrical device includes a housing that houses electrical components electrically connected to the plurality of battery cells.

[0012] [6] The battery pack according to any one of [1] to [5], wherein the busbar module has another positioning mechanism that positions the busbar module in at least one of the first direction and the second direction. [Effects of the Invention]

[0013] According to this technology, by providing a positioning mechanism for the board unit in the bus bar module, it is possible to accurately position the board unit even in a cell-to-pack structure that does not have module components such as bind bars, thereby simplifying the battery pack manufacturing process. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. [Figure 2] FIG. [Figure 3] FIG. 10 is a top view of a plate member in the bus bar module. [Figure 4] FIG. 2 is a perspective view showing the structure around the bus bar. [Figure 5] 10A and 10B are diagrams illustrating a positioning mechanism for the bus bar module in the Y-axis direction. [Figure 6] FIG. 2 is a perspective view showing the structure between the bus bar module and the upper surface of the battery cell. [Figure 7] FIG. 2 is a perspective view showing a rear surface of a plate member in the bus bar module. [Figure 8] 10A and 10B are diagrams illustrating a positioning mechanism for the bus bar module in the X-axis direction. [Figure 9] 10 is a diagram showing the periphery of a junction box housed in a case as viewed from the Z-axis direction. FIG. [Figure 10] FIG. 2 is a diagram schematically illustrating a substrate unit. [Figure 11] FIG. 2 is a perspective view showing a wall portion provided in the bus bar module. [Figure 12] FIG. 10 is a perspective view showing a claw portion provided on the bus bar module. [Figure 13] FIG. 10 is a perspective view showing a fastening portion between the board unit and the junction box. [Figure 14] FIG. 10 is a perspective view (part 1) showing a modified example of the substrate unit. [Figure 15] FIG. 15 is a perspective view showing the structure shown in FIG. 14 as viewed from a different direction. [Figure 16] FIG. 10 is a perspective view (part 2) showing a modified example of the substrate unit. [Figure 17] FIG. 10 is a perspective view (part 3) showing a modified example of the substrate unit. [Figure 18] 18 is a diagram showing a state in which the board unit shown in FIG. 17 is attached to a cover member of the bus bar module. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0015] 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 may not be repeated.

[0016] In the embodiments described below, when numbers, amounts, etc. are mentioned, the scope of the present technology is not necessarily limited to those numbers, amounts, etc., unless otherwise specified. Furthermore, in the following embodiments, each component is not necessarily essential to the present technology, unless otherwise specified. Furthermore, the present technology is not necessarily limited to those that achieve all of the effects and advantages mentioned in the present embodiments.

[0017] In this specification, the terms "comprise," "include," and "have" are open-ended. That is, when a certain feature is included, other features may or may not be included.

[0018] Furthermore, when geometric terms and terms expressing positional and directional relationships are used in this specification, such as "parallel," "orthogonal," "45° diagonal," "coaxial," and "along," 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 a single state, and the relative positional relationships can be reversed or rotated to any angle depending on the installation direction of each mechanism (for example, by turning the entire mechanism upside down).

[0019] In this specification, "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, "battery packs" can be installed in hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), and battery electric vehicles (BEVs). However, the use of "battery cells" is not limited to in-vehicle use.

[0020] Fig. 1 is an exploded perspective view of a battery pack 1. As shown in Fig. 1, the battery pack 1 includes a stack 10 including a plurality of battery cells 100 (see Fig. 2) arranged in the Y-axis direction (first direction), a case 20 that houses the stack 10, and a bus bar module 30 arranged on the stack 10.

[0021] The laminate 10 includes a laminate 10A (first laminate), a laminate 10B (second laminate), and a laminate 10C (third laminate). The laminates 10A and 10B are adjacent to each other in the X-axis direction (second direction). The laminates 10B and 10C are adjacent to each other in the X-axis direction.

[0022] The case 20 has a pair of side walls 21 that face the stacks 10A, 10B, and 10C in the Y-axis direction. The side walls 21 directly support the stacks 10A, 10B, and 10C from both sides in the Y-axis direction. In this way, the battery pack 1 according to this embodiment employs a cell-to-pack structure in which the stack 10, which includes multiple battery cells 100, is housed directly in the case.

[0023] The case 20 has a pair of side walls 22 extending in a direction perpendicular to the side walls 21, and a bottom surface 23 facing the stacks 10A, 10B, and 10C in the Z-axis direction. The portions of the bottom surface 23 on which the stacks 10A, 10B, and 10C are placed are formed to extend in the XY plane. The bottom surface 23 includes an inclined surface 23A formed at a position adjacent to the stacks 10A, 10B, and 10C or at a position spaced apart from the stacks 10A, 10B, and 10C. The inclined surface 23A extends in a direction obliquely intersecting the XY plane.

[0024] The busbar module 30 includes a busbar module 30A (first busbar module) arranged on the laminate 10A, a busbar module 30B (second busbar module) arranged on the laminate 10B, and a busbar module 30C (third busbar module) arranged on the laminate 10C.

[0025] Fig. 2 is a perspective view showing the configuration of the battery cell 100 that makes up the laminates 10A, 10B, and 10C. As shown in Fig. 2, the battery cell 100 has a rectangular shape. The battery cell 100 has an electrode terminal 110, a housing 120, and a gas release valve 130.

[0026] 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 aligned 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 spaced apart from each other in the X-axis direction.

[0027] The housing 120 has a substantially rectangular parallelepiped shape. An electrode assembly and an electrolyte (not shown) are housed 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.

[0028] 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).

[0029] Each of the first side surface 123 and the second side surface 124 is made 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 when viewed in the Y-axis direction, with the X-axis direction being the longitudinal direction and the Z-axis direction being the lateral direction.

[0030] 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.

[0031] Gas exhaust valve 130 is provided on top surface 121. When the internal pressure of housing 120 rises 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.

[0032] Next, the basic configuration of the busbar module 30 will be described with reference to Fig. 3 and Fig. 4. 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 a busbar 320 in the busbar module 30.

[0033] Each of the busbar modules 30A, 30B, and 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, through-holes 313 formed at positions corresponding to the gas release valves 130 of the battery cells 100, and wall portions 314 that divide the space on the plate member 310 into multiple sections.

[0034] As shown in FIG. 4, a bus bar 320 is housed in each space separated by the wall portion 314. The bus bar 320 is made of a conductor (typically, a metal member). The bus bar 320 electrically connects the electrode terminals 110 of the multiple battery cells 100 to one another. The bus bar 320 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.

[0035] The wall portion 314 of the plate member 310 includes a first portion 314A, a second portion 314B, and a third portion 314C. The first portion 314A and the second portion 314B are formed to extend in the X-axis direction. The first portion 314A and the second portion 314B are spaced apart from each other in the Y-axis direction. The third portion 314C connects the first portion 314A and the second portion 314B.

[0036] Ribs 315 and locks 316 are formed on wall portion 314. Ribs 315 protrude on both sides in the Y-axis direction from positions adjacent to third portion 314C of wall portion 314. Ribs 315 position adjacent bus bars 320 in the Y-axis direction. Locks 316 lock bus bars 320 in the Z-axis direction. The shapes and arrangements of ribs 315 and locks 316 are not limited to those shown in FIG. 4 and can be changed as appropriate.

[0037] Bus bar 320 is connected to wiring 1100. Wiring 1100 is fixed to bus bar 320 with screws 1200. The configuration of wiring 1100 and screws 1200 is not limited to that shown in Fig. 4, and the wiring may be formed of, for example, a flexible wiring board.

[0038] The electrode terminals 110 and bus bars 320 of the battery cells 100 are welded together after being positioned relative to each other in the X-axis and Y-axis directions. By accurately positioning the electrode terminals 110 and bus bars 320, the welding process between the electrode terminals 110 and bus bars 320 can be carried out with high efficiency and quality. When the bus bars 320 are housed in the space partitioned by the wall portions 314, they are accurately positioned relative to the plate members 310 in the X-axis and Y-axis directions. Therefore, it is necessary to accurately position the plate members 310 and the stack 10.

[0039] The positioning mechanism of the bus bar module 30 (plate member 310) in this embodiment will be described with reference to FIGS.

[0040] Fig. 5 is a diagram showing a positioning mechanism for the busbar module 30 in the Y-axis direction. As shown in Fig. 5, the plate member 310 of the busbar module 30 has a protrusion 317 (positioning mechanism) that urges the side wall 21 of the case 20 to position the busbar module 30 in the Y-axis direction.

[0041] 5 is configured as a snap-fit ​​protrusion formed on the end surface 311 of the plate member 310. The protrusion 317 protrudes from the end surface 311 of the plate member 310 toward the side wall 21. When the plate member 310 is installed in the case 20, the protrusion 317 presses against the side wall 21 of the case 20, urging the plate member 310 toward a predetermined position. As a result, the busbar module 30 is positioned in the Y-axis direction.

[0042] The protrusions 317 may be provided on the end faces 311 of the plate member 310 on both sides in the Y axis direction, or on only one side in the Y axis direction of the plate member 310. When the protrusions 317 are provided on both sides in the Y axis direction, the plate member 310 is urged toward the center of the case 20 in the Y axis direction, and is positioned at a position where the urging forces of the protrusions 317 on both sides are balanced. When the protrusions 317 are provided on one side in the Y axis direction, the plate member 310 is urged toward the side wall 21 opposite the side on which the protrusions 317 are provided, and is positioned using the side wall 21 as a reference plane.

[0043] The protrusions 317 deform toward the center of the stack 10 as a reaction to the pressure on the side walls 21 of the case 20. At this time, it is preferable that the protrusions 317 are positioned so as not to interfere with the gas release valves 130 when viewed from the Z-axis direction. This allows the busbar module 30 to be positioned in the Y-axis direction without affecting the release of gas from the gas release valves 130 of the battery cells 100 located at the ends in the Y-axis direction.

[0044] FIG. 6 is a perspective view showing the structure between the bus bar module 30 and the upper surface 121 of the battery cell 100.

[0045] As shown in FIG. 6, the stack 10 includes separators 11 disposed between the multiple battery cells 100. The separators 11 may be a film or tape that covers the first side surface 123, the second side surface 124, and the third side surface 125 of the battery cells 100. The separators 11 may also be a film that encases the housing 120. The separators 11 may also be plate-shaped members (plates) that are sandwiched between adjacent battery cells 100. The separators 11 may also be formed by combining the above film or tape with a plate-shaped member. The separators 11 have protruding portions 11A that protrude toward the plate member 310 beyond the multiple battery cells 100. The plate member 310 has recessed portions 318 that avoid the protruding portions 11A of the separators 11.

[0046] FIG. 7 is a perspective view showing the back surface of the plate member 310. As shown in FIG. 7, the plate member 310 has a bottom surface 319A. The bottom surface 319A faces the top surface of the battery cell 100. A protruding rib 319 that protrudes from the bottom surface 319A of the plate member 310 toward the top surface 121 of the battery cell 100 is provided on part of the bottom surface 319A of the plate member 310. The protruding rib 319 abuts against the top surface 121 of the battery cell 100. In the example of FIG. 7, the protruding rib 319 is formed discontinuously on both sides of the through-hole 313 so as to extend in the Y-axis direction.

[0047] Fig. 8 is a diagram showing a positioning mechanism for the busbar module 30 in the X-axis direction. As shown in Fig. 8, the busbar module 30 has an insertion mechanism 330 that is inserted between two adjacent laminates (laminates 10A and 10B in the example of Fig. 8) and positions the busbar module 30 in the X-axis direction. In the example of Fig. 8, the laminate 10A has the insertion mechanism 330A, and the laminate 10B has the insertion mechanism 330B, but the scope of the present technology is not limited to a case where all laminates 10 have the insertion mechanism 330, and only some of the multiple laminates 10 may have the insertion mechanism 330.

[0048] The insertion mechanism 330A has an insertion portion 331A that is press-fitted between the laminates 10A and 10B. When the insertion portion 331A is press-fitted between the laminates 10A and 10B, the busbar module 30A is urged in a direction away from the laminate 10B. At this time, the insertion portion 331A comes into contact with a side surface of the laminate 10A, thereby positioning the busbar module 30A in the X-axis direction.

[0049] The insertion mechanism 330B has an insertion portion 331B that is press-fitted between the laminates 10A and 10B. When the insertion portion 331B is press-fitted between the laminates 10A and 10B, the busbar module 30B is urged in a direction away from the laminate 10A. At this time, the insertion portion 331B comes into contact with a side surface of the laminate 10B, thereby positioning the busbar module 30B in the X-axis direction.

[0050] FIG. 9 is a diagram showing the periphery of the junction box 40 (electrical equipment) housed in the case 20 as viewed from the Z-axis direction.

[0051] 9, external terminals 50 are provided on the side walls 22 of the case 20. The junction box 40 is disposed on an inclined surface 23A located between the laminates 10A, 10B, 10C and the external terminals 50 along the X-axis direction.

[0052] Junction box 40 includes a relay 410 , a resistor 420 , a fuse mechanism 430 , a terminal connection portion 440 , a housing 460 , and a bus bar 480 .

[0053] The relay 410 and the resistor 420 are housed in a housing 460. The fuse mechanism 430 and the terminal connection portion 440 are attached to the inside of the side wall 22 of the case 20. The relay 410 is heavier than the other electrical components housed in the housing 460, such as the resistor 420. In other words, the relay 410 is the heaviest of the electrical components housed in the housing 460.

[0054] Housing 460 is fastened to inclined surface 23A of case 20 at fastening portions 450. In the example of Fig. 9, five fastening portions 451, 452, 453, 454, and 455 are provided. In the example of Fig. 9, three fastening portions 451, 452, and 453 are provided so that their centers surround center of gravity 411A of negative relay 411 (dashed lines in Fig. 9). Furthermore, four fastening portions 452, 453, 454, and 455 are provided so that their centers surround center of gravity 412A of positive relay 412 (dashed lines in Fig. 9).

[0055] 9, at least three (for example, three or four) fastening portions 450 are arranged so as to surround the centers of gravity 411A, 412A of the two relays 411, 412. By arranging the fastening portions 450 so as to surround the relay 410, which is a heavy object, the housing 460 can be stably fixed to the case 20.

[0056] The multiple battery cells 100 that make up the stacks 10A, 10B, and 10C are connected in series, and their negative terminals are connected to a bus bar 481 of the junction box 40 at a fastening portion 480A. The bus bar 481 is connected to a relay 411.

[0057] Relay 411 is connected to fuse mechanism 430 via bus bar 482. Fuse mechanism 430 has a first portion 431 and a second portion 432, and a fusion portion is provided between first portion 431 and second portion 432. First portion 431 and second portion 432 of fuse mechanism 430 are connected to bus bars 482 and 483, respectively, via fastening portion 430A. This connects bus bar 482 and bus bar 483 via fuse mechanism 430. The other end of bus bar 483 is connected to terminal connection portion 441 via fastening portion 440A.

[0058] The positive electrode terminals of the multiple battery cells 100 that make up the stacks 10A, 10B, and 10C are connected to a bus bar 484 of the junction box 40 at a fastening portion 480B. The bus bar 484 is connected to a resistor 420. The resistor 420 is connected to a relay 412 via a bus bar 485. The relay 412 is connected to a terminal connection portion 442 via a bus bar 486.

[0059] The fastening portions 430A, 440A are configured with fastening members such as bolts. The terminal connection portions 441, 442 are electrically connected to the external terminals 50. As a result, the external terminals 50 form power supply ports for the battery cells 100 housed in the case 20 and the junction box 40.

[0060] 10 is a diagram schematically illustrating the board unit 60. The board unit 60 includes a board that is electrically connected to the plurality of battery cells 100 and the junction box 40.

[0061] As shown in Fig. 10, the board unit 60 is arranged so that a portion of it is located above the bus bar module 30C. In the example of Fig. 10, the board unit 60 is arranged so that it extends from above the bus bar module 30C to above the junction box 40. The board unit 60 may also be arranged so that the entire board unit 60 is located above the bus bar module 30. The board unit 60 is fastened to the junction box 40 at fastening portions 60A.

[0062] The busbar module 30 has a wall portion 340 and a claw portion 350. The wall portion 340 includes two wall portions 341 and 342, and the board unit 60 can be positioned in the X-axis direction by pressing the board unit 60 against the wall portions 341 and 342. Therefore, the wall portion 340 can constitute a "positioning mechanism" that positions the board unit 60 in the X-axis direction before or when fastening the board unit 60 to the junction box 40.

[0063] The claw portion 350 includes a pair of claw portions 351, 352 arranged to sandwich the board unit 60 in the Y-axis direction. The claw portions 351, 352 engage with the board unit 60. The claw portion 350 can constitute a "positioning mechanism" that positions the board unit 60 in the Y-axis direction. Furthermore, the claw portion 350 can constitute a "locking mechanism" that suppresses displacement of the board unit 60 in the Z-axis direction.

[0064] Fig. 11 is a perspective view showing the structure of the wall portion 340. Fig. 12 is a perspective view showing the structure of the claw portion 351. As shown in Figs. 11 and 12, the board unit 60 includes a board 61, a cover member 62, and a base 63.

[0065] 11, the wall portions 341 and 342 are formed to protrude in the Z-axis direction from the cover member 360 of the busbar module 30. In the example of Fig. 11, the side surfaces of the board unit 60 are pressed against the wall portions 341 and 342, thereby positioning the board unit 60 in the X-axis direction relative to the busbar module 30. The number and arrangement of the wall portions 340 can be changed as appropriate.

[0066] As shown in FIG. 12, the claw portion 351 includes two claw portions 351A and 351B formed to protrude in the Z-axis direction from the cover member 360 of the busbar module 30. When the board unit 60 is positioned in the X-axis direction by the wall portion 340, the claw portions 351A and 351B can engage with recesses or holes provided in the cover member 62 of the board unit 60. Although not shown in FIG. 12, the claw portion 352 can have a structure similar to that of the claw portion 351. The claw portions 351 and 352 suppress displacement of the board unit 60 in the Z-axis direction. The number and arrangement of the claw portions 350 can be changed as appropriate.

[0067] As described above, the bus bar modules 30A, 30B, and 30C are positioned relative to the case 20 in the X-axis direction and the Y-axis direction. By positioning the board unit 60 relative to the bus bar module 30, the board unit 60 can be positioned relative to the case 20.

[0068] 13 is a perspective view showing the fastening portion 60A. As shown in FIG. 13, the base 63 of the board unit 60 and the junction box 40 are fastened together at the fastening portion 60A. Then, the housing 460 of the junction box 40 is fixed to the inclined surface 23A of the case 20 at the fastening portion 450. Note that instead of or in addition to fastening the board unit 60 to the junction box 40, the board unit 60 may be fastened to the busbar module 30.

[0069] Fig. 14 is a perspective view showing a modified example of the board unit 60, and Fig. 15 is a perspective view showing the structure shown in Fig. 14 as viewed from a different direction. In the modified example shown in Figs. 14 and 15, a protrusion 361 is provided on a cover member 360 of the busbar module 30, a hole 63A is provided on a base 63 of the board unit 60, and the protrusion 361 is fitted into the hole 63A, thereby positioning the board unit 60. The hole 63A may be a blind hole or a through hole.

[0070] 16 is a perspective view showing another modified example of the board unit 60. As shown in Fig. 16, a protrusion 63B may be provided on the base 63 of the board unit 60, and the board unit 60 may be positioned by fitting the protrusion 63B into a hole (not shown) provided in the cover member 360 of the bus bar module 30.

[0071] FIG. 17 is a perspective view showing a further modified example of the board unit 60, and FIG. 18 is a diagram showing a state in which the board unit 60 shown in FIG. 17 is attached to the cover member 360 of the bus bar module 30.

[0072] 17 and 18, the base 63 of the board unit 60 is not provided, and the board unit 60 is integrated with the cover member 360 of the bus bar module 30. As shown in Fig. 18, after the board unit 60 and the cover member 360 are combined, the combined board unit 60 and cover member are attached to the bus bar module 30 and the junction box 40.

[0073] In the battery pack 1 according to the present embodiment, by providing a positioning mechanism for the board unit 60 in the bus bar module 30, it is possible to accurately position the board unit 60 and simplify the manufacturing process even in a cell-to-pack structure that does not include module components such as bind bars. Note that the positioning of the board unit 60 may be temporary positioning until the board unit 60 is fastened to other components such as the junction box 40.

[0074] Although the embodiments of the present technology have been described above, the embodiments disclosed herein should be considered to be 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 meaning and scope of the claims. [Explanation of symbols]

[0075] 1 battery pack, 10, 10A, 10B, 10C laminate, 11 separator, 11A protrusion, 20 case, 21, 22 side wall, 23 bottom surface, 23A inclined surface, 30, 30A, 30B, 30C bus bar module, 40 junction box, 50 external terminal, 60 board unit, 60A fastening portion, 61 board, 62 cover member, 63 base, 63A hole, 63B protrusion, 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 release valve, 310 plate member, 311, 312 end surface, 313 through hole, 314 Wall portion, 314A First portion, 314B Second portion, 314C Third portion, 315 Rib, 316 Lock, 317 Protrusion, 318 Recess, 319 Protruding rib, 319A Bottom surface, 320 Bus bar, 321 Root portion, 322, 323 Connection portion, 330, 330A, 330B Insertion mechanism, 331A, 331B Insertion portion, 340, 341, 342 Wall portion, 350, 351, 351A, 351B, 352 Claw portion, 360 Cover member, 361 Protrusion, 410, 411, 412 Relay, 411A, 412A Center of gravity, 420 Resistor, 430 Fuse mechanism, 430A Fastening portion, 431 First portion, 432 Second part, 440, 441, 442 terminal connection, 440A fastening part, 450, 451, 452, 453, 454, 455 fastening part, 460 housing, 480, 481, 482, 483, 484, 485, 486 bus bar, 480A, 480B fastening part, 1100 wiring, 1200 screws.

Claims

1. a stack including a plurality of battery cells arranged in a first direction; a case that houses the stack, the case having a side wall that faces the stack from the first direction; a bus bar module disposed on the stack and including bus bars that electrically connect the plurality of battery cells and plate members that house the bus bars; an electrical device aligned with the laminate along a second direction perpendicular to the first direction; a substrate unit, at least a portion of which is disposed on the bus bar module, the substrate unit including a substrate electrically connected to the laminate and the electrical device; the bus bar module has a positioning mechanism for the board unit, the positioning mechanism includes a wall facing the second direction and extending in a third direction perpendicular to the first direction and the second direction; The battery pack is configured such that the substrate unit extends from above the busbar module to above the electrical device and is fastened to the electrical device.

2. The battery pack according to claim 1 , wherein the positioning mechanism further includes a hole extending in the third direction.

3. 3. The battery pack according to claim 1, wherein the positioning mechanism positions the board unit in the first direction and the second direction.

4. A battery pack as described in claim 1 or claim 2, wherein the positioning mechanism is arranged to clamp the board unit from the first direction, and further includes a pair of claw portions that position the board unit in the first direction and suppress displacement of the board unit in the third direction.

5. 3. The battery pack according to claim 1, wherein the electrical device includes a housing that houses electrical components electrically connected to the plurality of battery cells.

6. 3. The battery pack according to claim 1, wherein the bus bar module has another positioning mechanism that positions the bus bar module in at least one of the first direction and the second direction.

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