Battery pack

Abstract

The invention relates to a battery pack. A battery pack (1) is provided with: a laminated body (10) including a plurality of battery cells (100) arranged in a first direction; a case (20) that has a side wall (21) facing the laminated body (10) from the first direction, and that houses the laminated body (10); a bus bar module (30) including a bus bar (320) disposed on the laminated body (10) and electrically connecting the plurality of battery cells (100), and a plate member (310) housing the bus bar (320); an electrical device (40) aligned with the laminate (10) along a second direction orthogonal to the first direction; and a substrate unit (60), at least a part of which is disposed on the bus bar module (30) and which includes a substrate electrically connected to the laminated body (10), the bus bar module (30) having a positioning mechanism (340) for the substrate unit (60), and the substrate unit (60) being fastened to the electrical device (40).

Description

Technical Field

[0001] The invention relates to a battery pack. Background Art

[0002] As described in Chinese Utility Model No. 213071279 and Chinese Utility Model No. 213782118, a cell-to-pack structure is beginning to be adopted in battery packs in which a stack including multiple battery cells is directly housed in a casing without using end plates and restraining bars (module structure) for restraining multiple battery cells. Summary of the invention

[0003] When positioning the substrate housing relative to a stack of multiple battery cells, in a module structure, for example, a restraint bar can be used as a fixing portion for positioning. However, in a Cell-to-Pack structure, since there is no restraint bar, a mechanism different from that of a module-structured battery pack is required.

[0004] An object of the present invention is to provide a battery pack that can position a substrate case with high precision and simplify the manufacturing process even in a Cell-to-Pack structure.

[0005] The present invention provides the following battery pack.

[0006] [1] A battery pack, wherein the battery pack comprises: a stack including a plurality of battery cells arranged in a first direction; a housing having a side wall facing the stack from the first direction and accommodating the stack; a busbar module including a busbar disposed on the stack and electrically connecting the plurality of battery cells and a plate member accommodating the busbar; an electrical device arranged with the stack along a second direction orthogonal to the first direction; and a substrate unit at least partly disposed on the busbar module and including a substrate electrically connected to the stack and the electrical device, the busbar module having a positioning mechanism for the substrate unit.

[0007] [2] In the battery pack described in [1], the positioning mechanism includes a wall or a hole extending in a third direction orthogonal to the first direction and the second direction.

[0008] [3] In the battery pack described in [1] or [2], the positioning mechanism positions the substrate unit in at least the second direction.

[0009] [4] In the battery pack described in any one of [1] to [3], the substrate unit is configured to reach the electrical device from above the bus bar module.

[0010] [5] In the battery pack described in any one of [1] to [4], the electric device includes a housing that houses an electric element electrically connected to the plurality of battery cells.

[0011] [6] In the battery pack described in any one of [1] to [5], the bus bar module has another positioning mechanism for positioning the bus bar module in at least one of the first direction and the second direction.

[0012] The above and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when read in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is an exploded perspective view of the battery pack.

[0014] Figure 2 It is a three-dimensional diagram of a battery cell.

[0015] Figure 3 It is a top view of the plate component in the busbar module.

[0016] Figure 4 It is a perspective view showing the structure around the busbar.

[0017] Figure 5 It is a diagram showing a positioning mechanism of the busbar module in the Y-axis direction.

[0018] Figure 6 It is a perspective view showing the structure between the bus bar module and the upper surface of the battery cell.

[0019] Figure 7 It is a perspective view showing the back side of a plate member in a busbar module.

[0020] Figure 8 It is a diagram showing a positioning mechanism of the busbar module in the X-axis direction.

[0021] Fig. 9 This is a diagram showing a state where the periphery of the junction box housed in the housing is viewed from the Z-axis direction.

[0022] Fig.10 It is a diagram schematically showing a substrate unit.

[0023] Fig.11 It is a perspective view showing a wall portion provided in the bus bar module.

[0024] Fig.12 It is a perspective view showing a claw portion provided in the bus bar module.

[0025] Fig.13 It is a perspective view showing the fastening portion between the base unit and the junction box.

[0026] Fig.14 This is a perspective view showing a modified example of the substrate unit (Part 1).

[0027] Fig.15It means observing from different directions Fig.14 A perspective view of the state of the structure shown.

[0028] Fig.16 This is a perspective view showing a modified example of the substrate unit (part 2).

[0029] Fig.17 This is a perspective view showing a modified example of the substrate unit (part 3).

[0030] Fig.18 It means that Fig.17 The illustrated diagram shows a state in which the substrate unit is mounted on a cover member of a bus bar module. DETAILED DESCRIPTION

[0031] Hereinafter, an embodiment of the present invention will be described. In addition, the same reference numerals may be given to the same or corresponding parts, and the description thereof may not be repeated.

[0032] In addition, in the embodiments described below, when the number, quantity, etc. are mentioned, except for the cases specifically described, the scope of the present invention is not necessarily limited to the number, quantity, etc. In addition, in the following embodiments, each component is not necessarily essential to the present invention except for the cases specifically described. In addition, the present invention is not necessarily limited to achieving all the effects mentioned in the present embodiments.

[0033] In addition, in this specification, the descriptions of “comprise”, “include”, and “have” are open-ended. That is, when a certain structure is included, other structures other than the structure may be included or not.

[0034] In addition, in this specification, when geometric terms and terms indicating position and direction relationships, such as "parallel", "orthogonal", "oblique 45°", "coaxial", "along", etc., are used, these terms allow for manufacturing errors or slight changes. In this specification, when terms such as "upper side" and "lower side" are used to indicate relative positional relationships, these terms are used to indicate relative positional relationships in one state, and the relative positional relationship can be flipped or rotated to any angle by the setting direction of each mechanism (for example, turning the entire mechanism upside down, etc.).

[0035] In this specification, "battery" is not limited to lithium-ion batteries, and can include other batteries such as nickel-metal hydride batteries and sodium-ion batteries. In this specification, "battery pack" can be installed in hybrid electric vehicles (HEV), plug-in hybrid electric vehicles (PHEV) and electric vehicles (BEV). However, the use of "battery cells" is not limited to vehicle use.

[0036] Figure 1 1 is an exploded perspective view of the battery pack 1. Figure 1 As shown, the battery pack 1 includes: a plurality of battery cells 100 (see Figure 2 ) of a stacked body 10; a housing 20 for housing the stacked body 10; and a busbar module 30 disposed on the stacked body 10.

[0037] The stack 10 includes a stack 10A (first stack), a stack 10B (second stack), and a stack 10C (third stack). The stacks 10A and 10B are adjacent to each other in the X-axis direction (second direction). The stacks 10B and 10C are adjacent to each other in the X-axis direction.

[0038] The housing 20 has a pair of side walls 21 facing the stacked bodies 10A, 10B, and 10C in the Y-axis direction. The side walls 21 directly support the stacked bodies 10A, 10B, and 10C from both sides in the Y-axis direction. In this way, the battery pack 1 of this embodiment is a battery pack adopting a Cell-to-Pack structure in which the stacked body 10 including a plurality of battery cells 100 is directly accommodated in the housing.

[0039] The housing 20 includes a pair of side walls 22 extending in a direction orthogonal to the side walls 21 and a bottom surface 23 facing the stacked bodies 10A, 10B, and 10C from the Z-axis direction. The portion of the bottom surface 23 on which the stacked bodies 10A, 10B, and 10C are placed is formed to extend in the X-Y plane direction. The bottom surface 23 includes an inclined surface 23A formed at a position adjacent to the stacked bodies 10A, 10B, and 10C or at a position separated from the stacked bodies 10A, 10B, and 10C. The inclined surface 23A extends in a direction obliquely intersecting the X-Y plane.

[0040] The busbar module 30 includes a busbar module 30A (first busbar module) disposed on the stack 10A, a busbar module 30B (second busbar module) disposed on the stack 10B, and a busbar module 30C (third busbar module) disposed on the stack 10C.

[0041] Figure 2 1 is a perspective view showing the structure of a battery cell 100 constituting the stacked bodies 10A, 10B, and 10C. Figure 2 As shown, the battery cell 100 has a square shape and includes an electrode terminal 110 , a frame 120 , and a gas exhaust valve 130 .

[0042] The electrode terminal 110 is formed on the frame 120. The electrode terminal 110 includes a positive terminal 111 and a negative terminal 112 as two electrode terminals 110 arranged along the X-axis direction (second direction) orthogonal to the Y-axis direction (first direction). The positive terminal 111 and the negative terminal 112 are provided to be separated from each other in the X-axis direction.

[0043] The frame 120 has a substantially rectangular parallelepiped shape. An electrode assembly and an electrolyte solution (not shown) are accommodated in the frame 120. The frame 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.

[0044] The upper surface 121 is a plane perpendicular to the Z-axis direction. The electrode terminal 110 is arranged 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).

[0045] Each of the first side surface 123 and the second side surface 124 is formed of a plane orthogonal 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 frame body 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 in which the X-axis direction is the long side direction and the Z-axis direction is the short side direction when viewed in the Y-axis direction.

[0046] The plurality of battery cells 100 are stacked such that the first side surfaces 123 and the second side surfaces 124 face each other between the battery cells 100 and 100 adjacent to each other in the Y-axis direction. Thus, the positive terminals 111 and the negative terminals 112 are alternately arranged in the Y-axis direction.

[0047] The gas discharge valve 130 is provided on the upper surface 121 . When the internal pressure of the housing 120 increases to a predetermined value or more due to the gas generated inside the housing 120 , the gas discharge valve 130 opens and discharges the gas to the outside of the housing 120 .

[0048] Next, use Figure 3 and Figure 4 , the basic structure of the busbar module 30 is described. Figure 33 is a top view of the plate member 310 included in the busbar module 30 . Figure 4 It is a perspective view showing the structure around the bus bar 320 in the bus bar module 30 .

[0049] The busbar modules 30A, 30B, and 30C respectively include Figure 3 The plate member 310 is shown. Figure 3 As shown, 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 at a position corresponding to the gas exhaust valve 130 of the battery cell 100; and a wall portion 314 that divides the space on the plate member 310 into multiple parts.

[0050] like Figure 4 As shown, busbars 320 are housed in each space separated by the wall portion 314. The busbar 320 is composed of a conductor (typically a metal member). The busbar 320 electrically connects the electrode terminals 110 of multiple battery cells 100 to each other. The busbar 320 includes a root portion 321 extending in the Y-axis direction and a connecting portion 322 (first connecting portion) and a connecting portion 323 (second connecting portion) protruding from the root portion 321 in the X-axis direction. The connecting portions 322 and 323 are respectively connected to the electrode terminals 110 of two battery cells 100 adjacent to each other in the Y-axis direction.

[0051] 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 located at mutually separated positions in the Y-axis direction. The third portion 314C connects the first portion 314A and the second portion 314B.

[0052] The wall portion 314 is formed with a rib 315 and a locking portion 316. The rib 315 protrudes from a position adjacent to the third portion 314C of the wall portion 314 to both sides in the Y-axis direction. The rib 315 positions the adjacent plurality of busbars 320 in the Y-axis direction. The locking portion 316 locks the busbar 320 in the Z-axis direction. The shape or arrangement of the rib 315 and the locking portion 316 is not limited to Figure 4 The structure shown can be modified appropriately.

[0053] The busbar 320 is connected to the wiring 1100. The wiring 1100 is fixed to the busbar 320 by screws 1200. The wiring 1100 and the screws 1200 are not limited to the following. Figure 4 In the structure shown, for example, wiring can be formed by a flexible wiring substrate.

[0054] The electrode terminal 110 and the bus bar 320 of the battery cell 100 are positioned relative to each other in the X-axis direction and the Y-axis direction and then welded together. By accurately performing this positioning, the welding process of the electrode terminal 110 and the bus bar 320 can be carried out efficiently and with high quality. When the bus bar 320 is accommodated in the space separated by the wall portion 314, it is accurately positioned relative to the plate member 310 in the X-axis direction and the Y-axis direction. Therefore, it is required to position the plate member 310 and the stacked body 10 with high precision.

[0055] use Figures 5 to 8 , a positioning mechanism of the bus bar module 30 (plate member 310) in this embodiment will be described.

[0056] Figure 5 2 is a diagram showing the positioning mechanism of the busbar module 30 in the Y-axis direction. Figure 5 As shown, the plate member 310 of the bus bar module 30 has a protrusion 317 (positioning mechanism) for positioning the bus bar module 30 in the Y-axis direction by applying force to the side wall 21 of the housing 20 .

[0057] Figure 5 The protrusion 317 shown is 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 set in the housing 20, the protrusion 317 presses the side wall 21 of the housing 20, and the plate member 310 is urged toward a predetermined position. As a result, the busbar module 30 is positioned in the Y-axis direction.

[0058] The protrusion 317 may be provided on the end surface 311 on both sides of the plate member 310 in the Y-axis direction, or may be provided only on the end surface 311 on one side of the plate member 310 in the Y-axis direction. In the case where the protrusion 317 is provided on both sides in the Y-axis direction, the plate member 310 is forced toward the center of the housing 20 in the Y-axis direction and positioned at a position where the forces applied by the protrusions 317 on both sides are balanced. In the case where the protrusion 317 is provided on one side in the Y-axis direction, the plate member 310 is forced toward the side wall 21 on the opposite side of the side where the protrusion 317 is provided and positioned with the side wall 21 as a reference surface.

[0059] As a reaction to the side wall 21 of the pressing case 20, the protrusion 317 is deformed toward the center side of the stack 10. At this time, the protrusion 317 is preferably located at a position that does not interfere with the gas discharge valve 130 when viewed from the Z-axis direction. By setting it in this way, the busbar module 30 can be positioned in the Y-axis direction without affecting the gas discharge from the gas discharge valve 130 of the battery cell 100 located at the end in the Y-axis direction.

[0060] Figure 6It is a perspective view showing the structure between the bus bar module 30 and the upper surface 121 of the battery cell 100 .

[0061] like Figure 6 As shown, the stack 10 includes a spacer 11 disposed between a plurality of battery cells 100. The spacer 11 may be a film or a tape covering the first side 123, the second side 124, and the third side 125 of the battery cell 100. The spacer 11 may also be a film covering the frame 120. The spacer 11 may also be a plate-like member (plate) sandwiched between adjacent battery cells 100. The spacer 11 may also be formed by combining the above-mentioned film or tape with a plate-like member. The spacer 11 has a protrusion 11A protruding toward the plate member 310 side than the plurality of battery cells 100. The plate member 310 has a recess 318 avoiding the protrusion 11A of the spacer 11.

[0062] Figure 7 3 is a perspective view showing the back side of the plate member 310. Figure 7 As shown, the plate member 310 has a bottom surface 319A. The bottom surface 319A faces the upper surface of the battery cell 100. A protruding rib 319 protruding from the bottom surface 319A of the plate member 310 toward the upper surface 121 of the battery cell 100 is provided on a portion of the bottom surface 319A of the plate member 310. The protruding rib 319 abuts against the upper surface 121 of the battery cell 100. Figure 7 In the example of FIG. 3 , the protruding ribs 319 are intermittently formed on both sides of the through hole 313 so as to extend in the Y-axis direction.

[0063] Figure 8 2 is a diagram showing the positioning mechanism of the busbar module 30 in the X-axis direction. Figure 8 As shown, the busbar module 30 has two adjacent stacked bodies (in Figure 8 In the example of FIG. 1 , the insertion mechanism 330 is provided between the stacked bodies 10A and 10B and performs positioning of the busbar module 30 in the X-axis direction. Figure 8 In the example, the busbar module 30A has an insertion mechanism 330A, and the busbar module 30B has an insertion mechanism 330B, but the scope of the present invention is not limited to all busbar modules 30 having the insertion mechanism 330, and only a part of the multiple busbar modules 30 may have the insertion mechanism 330.

[0064] The insertion mechanism 330A has an insertion portion 331A that is pressed into between the stacked bodies 10A and 10B. When the insertion portion 331A is pressed into between the stacked bodies 10A and 10B, the busbar module 30A is forced in a direction away from the stacked body 10B. At this time, the insertion portion 331A abuts against the side surface of the stacked body 10A, thereby positioning the busbar module 30A in the X-axis direction.

[0065] The insertion mechanism 330B has an insertion portion 331B that is pressed between the stacked bodies 10A and 10B. When the insertion portion 331B is pressed between the stacked bodies 10A and 10B, the busbar module 30B is forced in a direction away from the stacked body 10A. At this time, the insertion portion 331B abuts against the side surface of the stacked body 10B, thereby positioning the busbar module 30B in the X-axis direction.

[0066] Fig. 9 This is a diagram showing a state where the periphery of the junction box 40 (electrical equipment) housed in the housing 20 is viewed from the Z-axis direction.

[0067] like Fig. 9 As shown, the external terminal 50 is provided on the side wall 22 of the housing 20. The junction box 40 is arranged on the inclined surface 23A located between the laminated bodies 10A, 10B, 10C and the external terminal 50 along the X-axis direction.

[0068] The junction box 40 includes a relay 410 , a resistor 420 , a fuse mechanism 430 , a terminal connection portion 440 , a frame 460 , and a bus bar 480 .

[0069] The relay 410 and the resistor 420 are housed in the frame 460. The fuse mechanism 430 and the terminal connection portion 440 are mounted on the inner side of the side wall 22 of the housing 20. The relay 410 is heavier than other electrical components such as the resistor 420 housed in the frame 460. That is, the relay 410 is the heaviest of the electrical components housed in the frame 460.

[0070] The frame 460 is fastened to the inclined surface 23A of the housing 20 at the fastening portion 450. Fig. 9 In the example of , five fastening parts 451, 452, 453, 454, and 455 are provided. Fig. 9 In the example, the three fastening parts 451, 452, and 453 are arranged so that their centers surround the center of gravity 411A ( Fig. 9 In addition, the four fastening parts 452, 453, 454, and 455 are arranged so that their centers surround the center of gravity 412A of the relay 412 on the positive electrode side ( Fig. 9 ).

[0071] In this way, Fig. 9 In the example, the fastening parts 450 are arranged at least at three points (for example, three or four points) to surround the centers of gravity 411A and 412A of the two relays 411 and 412. By arranging the fastening parts 450 to surround the relay 410 as a heavy object, the frame 460 can be stably fixed to the housing 20.

[0072] The plurality of battery cells 100 constituting the stacked bodies 10A, 10B, and 10C are connected in series, and the negative electrode-side common terminal thereof is connected to the bus bar 481 of the junction box 40 at the fastening portion 480A. The bus bar 481 is connected to the relay 411 .

[0073] The relay 411 is connected to the fuse mechanism 430 via the busbar 482. The fuse mechanism 430 has a first portion 431 and a second portion 432, and a fuse portion is provided between the first portion 431 and the second portion 432. The first portion 431 and the second portion of the fuse mechanism 430 are connected to the busbars 482 and 483, respectively, via the fastening portion 430A. Thus, the busbar 482 and the busbar 483 are connected via the fuse mechanism 430. The other end of the busbar 483 is connected to the terminal connection portion 441 via the fastening portion 440A.

[0074] The positive terminal of the plurality of battery cells 100 constituting the stack 10A, 10B, 10C is connected to the bus bar 484 of the junction box 40 at the fastening portion 480B. The bus bar 484 is connected to the resistor 420. The resistor 420 is connected to the relay 412 via the bus bar 485. The relay 412 is connected to the terminal connection portion 442 via the bus bar 486.

[0075] The fastening parts 430A and 440A are formed of fastening members such as bolts. The terminal connection parts 441 and 442 are electrically connected to the external terminal 50. Thus, the external terminal 50 forms a power supply port for supplying power to the battery cell 100 and the junction box 40 housed in the case 20.

[0076] Fig.10 2 is a diagram schematically showing the substrate unit 60 . The substrate unit 60 includes a substrate electrically connected to the plurality of battery cells 100 and the junction box 40 .

[0077] like Fig.10 As shown, the base unit 60 is configured so that a portion thereof is located on the busbar module 30C. Fig.10 In the example of FIG. 4 , the substrate unit 60 is arranged to extend from the bus bar module 30C to the junction box 40. Alternatively, the entire substrate unit 60 may be arranged to be located on the bus bar module 30. The substrate unit 60 is fastened to the junction box 40 at the fastening portion 60A.

[0078] The busbar module 30 includes a wall portion 340 and a claw portion 350. The wall portion 340 includes two wall portions 341 and 342, and the substrate unit 60 can be positioned in the X-axis direction by pressing the substrate unit 60 against the wall portions 341 and 342. Therefore, the wall portion 340 can constitute a "positioning mechanism" for positioning the substrate unit 60 in the X-axis direction before or when the substrate unit 60 and the junction box 40 are fastened.

[0079] The claw portion 350 includes a pair of claw portions 351 and 352 provided to clamp the substrate unit 60 from the Y-axis direction. The claw portions 351 and 352 engage with the substrate unit 60. The claw portion 350 can constitute a "positioning mechanism" for positioning the substrate unit 60 in the Y-axis direction. In addition, the claw portion 350 can constitute a "locking mechanism" for suppressing displacement of the substrate unit 60 in the Z-axis direction.

[0080] Fig.11 It is a perspective view showing the structure of the wall portion 340 . Fig.12 3 is a perspective view showing the structure of the claw portion 351. Fig.11 , Fig.12 As shown, the substrate unit 60 includes a substrate 61 , a cover member 62 , and a base 63 .

[0081] like Fig.11 As shown in FIG. 1 , the wall portions 341 and 342 are formed to protrude from the cover member 360 of the busbar module 30 in the Z-axis direction. Fig.11 In the example of FIG. 5 , the substrate unit 60 is positioned in the X-axis direction relative to the bus bar module 30 by pressing the side surfaces of the substrate unit 60 against the walls 341 and 342. The number or arrangement of the walls 340 can be changed as appropriate.

[0082] like Fig.12 As shown, 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 substrate unit 60 is positioned in the X-axis direction by the wall portion 340, the claw portions 351A and 351B can be engaged with the recessed portion or hole portion provided in the cover member 62 of the substrate unit 60. Fig.12 Although not shown in the figure, the claw portion 352 can also have the same structure as the claw portion 351. The displacement of the substrate unit 60 in the Z-axis direction is suppressed by the claw portions 351 and 352. The number or arrangement of the claw portions 350 can be changed as appropriate.

[0083] As described above, the bus bar modules 30A, 30B, and 30C are positioned in the X-axis direction and the Y-axis direction relative to the housing 20. By positioning the substrate unit 60 relative to the bus bar module 30, the substrate unit 60 can be positioned relative to the housing 20.

[0084] Fig.13 is a perspective view showing the fastening portion 60A. Fig.13As shown, at the fastening portion 60A, the base 63 of the substrate unit 60 is fastened to the junction box 40. Then, at the fastening portion 450, the frame 460 of the junction box 40 is fixed to the inclined surface 23A of the housing 20. In addition, the substrate unit 60 may be fastened to the busbar module 30 instead of being fastened to the junction box 40, or the substrate unit 60 may be fastened to the busbar module 30 in addition to being fastened to the junction box 40.

[0085] Fig.14 is a perspective view showing a modified example of the substrate unit 60. Fig.15 It means observing from different directions Fig.14 A perspective view of the state of the structure shown. Fig.14 , Fig.15 In the modified example shown, a protrusion 361 is provided on the cover member 360 of the busbar module 30, and a hole 63A is provided on the base 63 of the substrate unit 60, and the protrusion 361 is fitted into the hole 63A to position the substrate unit 60. The hole 63A may be a bottomed hole or a through hole.

[0086] Fig.16 is a perspective view showing another modified example of the substrate unit 60. Fig.16 As shown, the base 63 of the substrate unit 60 may be provided with a protrusion 63B, and the protrusion 63B may be fitted into a hole (not shown) provided in the cover member 360 of the bus bar module 30 to position the substrate unit 60 .

[0087] Fig.17 is a perspective view showing another modified example of the substrate unit 60. Fig.18 It means that Fig.17 The illustrated diagram is a diagram of a state in which the substrate unit 60 is attached to the cover member 360 of the bus bar module 30 .

[0088] exist Fig.17 , Fig.18 In the example shown, the base 63 of the substrate unit 60 is not provided, and the substrate unit 60 is integrated with the cover member 360 of the busbar module 30. Fig.18 As shown, after the substrate unit 60 is combined with the cover member 360 , the combined substrate unit 60 and cover member are assembled to the bus bar module 30 and the junction box 40 .

[0089] In the battery pack 1 of the present embodiment, by providing the positioning mechanism of the substrate unit 60 in the busbar module 30, the substrate unit 60 can be positioned with high precision even in a Cell-to-Pack structure without module components such as a restraining bar, thereby simplifying the manufacturing process. In addition, the positioning of the substrate unit 60 can also be a temporary positioning before fastening the substrate unit 60 to other components such as the junction box 40.

[0090] Although the embodiments of the present invention have been described, the embodiments disclosed this time should be considered to be illustrative in all aspects and not restrictive. The scope of the present invention is indicated by the claims, and it is intended to include all modifications within the meaning and scope equivalent to the claims.

Claims

1. A battery pack, characterized in that: The battery pack has: a stack including a plurality of battery cells arranged in a first direction; a housing having a side wall facing the stacked body from the first direction and accommodating the stacked body; a bus bar module including a bus bar disposed on the stack and electrically connecting the plurality of battery cells and a plate member for accommodating the bus bar; an electrical device arranged with the stacked body along a second direction orthogonal to the first direction; as well as a substrate unit, at least a portion of which is disposed on the busbar module and includes a substrate electrically connected to the stack and the electrical device, The bus bar module has a positioning mechanism for the substrate unit.

2. The battery pack according to claim 1, wherein: The positioning mechanism includes a wall or a hole extending in a third direction orthogonal to the first direction and the second direction.

3. The battery pack according to claim 1 or 2, wherein: The positioning mechanism positions the substrate unit in at least the second direction.

4. The battery pack according to claim 1 or 2, wherein: The base plate unit is configured to reach from the bus bar module to the electrical device.

5. The battery pack according to claim 1 or 2, wherein: The electric device includes a housing that houses electric components electrically connected to the plurality of battery cells.

6. The battery pack according to claim 1 or 2, wherein: The bus bar module has another positioning mechanism for positioning the bus bar module in at least one of the first direction and the second direction.

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