Battery pack

Abstract

To provide a battery pack in which a housing storing an electrical component can be firmly fixed to a case while overcoming restriction of a space.SOLUTION: A battery pack comprises: a laminate including a plurality of battery cells arranged in a first direction; an electric appliance which includes an electrical component electrically connected to a plurality of battery cells and a casing housing the electrical component; a case which houses the laminate and the electrical appliance; and an external terminal which is provided on the case, and is electrically connected to the electronic component. The laminate, the electric appliance, and the external terminal are arranged along a second direction orthogonal to a first direction in such a way that the electric appliance is positioned between the laminate and the external terminal. A fastening portion fastening the housing of the electric appliance to the case is provided, and the fastening portion is constituted in such a manner that relative error of the laminate and the external terminal in the second direction can be absorbed.SELECTED DRAWING: Figure 9

Description

[Technical field]

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

[0002] As described in Chinese Utility Model No. 213071279 (Patent Document 1), a battery pack formed by housing a plurality of battery cells in a case has been conventionally known. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] China Utility Model No. 213071279 Summary of the Invention [Problem to be solved by the invention]

[0004] There is a demand for improved energy density in battery packs. Space restrictions are becoming greater when fixing the housing that houses the electrical components to the battery pack case.

[0005] An object of the present technology is to provide a battery pack that can firmly fix a housing that houses electrical components to a case while overcoming space constraints. [Means for solving the problem]

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

[0007] [1] A battery pack comprising: a laminate including a plurality of battery cells aligned in a first direction; an electric device including electrical components electrically connected to the plurality of battery cells and a housing for housing the electrical components; a case for housing the laminate and the electrical device; and an external terminal provided on the case and electrically connected to the electrical components; the laminate, the electrical device, and the external terminal are arranged along a second direction perpendicular to the first direction such that the electrical device is located between the laminate and the external terminal; a fastening portion is provided for fastening the housing of the electrical device to the case; and the fastening portion is configured to be capable of absorbing a relative error between the laminate and the external terminal in the second direction.

[0008] [2] The battery pack according to [1], wherein the case has a side wall facing the laminate from a first direction.

[0009] [3] The battery pack described in [1] or [2], wherein the fastening portion includes a stud bolt fixed to the case, and the stud bolt is arranged along a third direction perpendicular to the first direction and the second direction.

[0010] [4] The battery pack described in any one of [1] to [3], wherein the electrical component includes a relay, and when viewed from a third direction perpendicular to the first direction and the second direction, the fastening portions are disposed at at least three points surrounding the center of gravity of the relay.

[0011] [5] The battery pack according to any one of [1] to [4], wherein the electrical component includes a relay, the relay having a first length along a first direction, a second length along a second direction, and a third length along a third direction perpendicular to the first direction and the second direction, the third length being shorter than the first length and the second length.

[0012] [6] The battery pack according to any one of [1] to [5], further comprising a busbar module including a busbar arranged on the laminate and electrically connecting the multiple battery cells, and a plate member for housing the busbar, the busbar module having a positioning mechanism for positioning the busbar module in at least one of a first direction and a second direction. Effect of the Invention

[0013] According to the present technology, the fastening portion that fastens the housing of the electrical device to the case can absorb the relative error between the laminate and the external terminal in the second direction, thereby making it possible to provide a battery pack that can firmly fix the housing that houses the electrical components to the case while overcoming space constraints. [Brief description of the drawings]

[0014] [Figure 1] FIG. [Diagram 2] FIG. [Diagram 3] FIG. 4 is a top view of a plate member in the bus bar module. [Figure 4] FIG. 2 is a perspective view showing a structure around a bus bar. [Diagram 5] 13A and 13B 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. 4 is a perspective view showing a rear surface of a plate member in the bus bar module. [Figure 8] 13A and 13B are diagrams illustrating a positioning mechanism for the bus bar module in the X-axis direction. [Figure 9] 1 is a diagram showing the periphery of a junction box housed in a case as viewed from the Z-axis direction. [Figure 10] FIG. 2 is a diagram illustrating a substrate unit. [Figure 11] FIG. 2 is a perspective view showing an inclined surface on which a junction box is disposed. [Figure 12] 12 is a perspective view showing a process of arranging a junction box on the inclined surface shown in FIG. 11. [Figure 13] FIG. 4 is a perspective view showing a fastening portion between the case and the junction box. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[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 will not be repeated.

[0016] 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.

[0017] 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.

[0018] 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).

[0019] 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.

[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 a 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, 10C in the Y-axis direction. The side walls 21 directly support the stacks 10A, 10B, 10C from both sides in the Y-axis direction. In this manner, the battery pack 1 according to this embodiment employs a cell-to-pack structure in which the stack 10 including the multiple battery cells 100 is stored 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 stacked bodies 10A, 10B, and 10C in 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 XY plane. 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 spaced apart from the stacked bodies 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 constituting 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 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.

[0027] 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.

[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 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.

[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 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.

[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, 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.

[0034] As shown in Fig. 4, a bus bar 320 is stored in each space partitioned 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 each other. 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 by 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 by, for example, a flexible wiring board.

[0038] The electrode terminals 110 and the busbars 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 performing this positioning accurately, the welding process between the electrode terminals 110 and the busbars 320 can be performed with high efficiency and quality. When the busbars 320 are stored in the space partitioned by the wall portions 314, they are accurately positioned relative to the plate member 310 in the X-axis and Y-axis directions. Therefore, it is necessary to accurately position the plate member 310 and the stack 10.

[0039] A positioning mechanism for 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 biases the side wall 21 of the case 20 to position the busbar module 30 in the Y-axis direction.

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

[0042] The protrusions 317 may be provided on 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 biased toward the center of the case 20 in the Y axis direction, and is positioned at a position where the biasing forces of the protrusions 317 on both sides are balanced. When the protrusion 317 is provided on one side in the Y axis direction, the plate member 310 is biased toward the side wall 21 opposite to the side on which the protrusion 317 is 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 located in a position that does not interfere with the gas release valves 130 when viewed from the Z axis direction. In this way, the busbar module 30 can 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 laminate 10 includes a separator 11 provided between the multiple battery cells 100. The separator 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 cell 100. The separator 11 may be a film that wraps around the housing 120. The separator 11 may be a plate-like member (plate) that is sandwiched between the adjacent battery cells 100. The separator 11 may also be formed by combining the above film or tape with a plate-like member. The separator 11 has a protruding portion 11A that protrudes toward the plate member 310 side beyond the multiple battery cells 100. The plate member 310 has a recessed portion 318 that avoids the protruding portion 11A of the separator 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 upper surface of the battery cell 100. A protruding rib 319 that protrudes from the bottom surface 319A of the plate member 310 toward the upper surface 121 of the battery cell 100 is provided on a part 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. 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 a part 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 biased 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, 10B. When the insertion portion 331B is press-fitted between the laminates 10A, 10B, the busbar module 30B is biased 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 a junction box 40 (electrical device) housed in the case 20 as viewed from the Z-axis direction.

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

[0052] The 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 heavy compared to other electrical components such as the resistor 420 housed in the housing 460. 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 portion 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 line in Fig. 9). Moreover, four fastening portions 452, 453, 454, and 455 are provided so that their centers surround center of gravity 412A of positive relay 412 (dashed line in Fig. 9).

[0055] 9, at least three fastening parts 450 (for example, three or four fastening parts 450) are arranged so as to surround the centers of gravity 411A, 412A of the two relays 411, 412. By arranging the fastening parts 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 constituting the stacks 10A, 10B, 10C are connected in series, and their negative electrode 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 first portion 431 and second portion 432, and a melting 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, 483, respectively, via fastening portion 430A. As a result, bus bar 482 and bus bar 483 are connected to each other 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 side general terminals of the multiple battery cells 100 constituting the stacks 10A, 10B, 10C are connected to a bus bar 484 of the junction box 40 at 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 formed of fastening members such as bolts. The terminal connection portions 441, 442 are electrically connected to the external terminal 50. As a result, the external terminal 50 forms a power supply port for the battery cell 100 and the junction box 40 housed in the case 20.

[0060] 10 is a diagram showing a schematic diagram of the board unit 60. The board unit 60 includes a board that is electrically connected to the multiple 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 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 the fastening portion 60A. After the board unit 60 is fastened to the junction box 40, the junction box 40 is fixed to the bottom surface 23 of the case 20 at the fastening portion 450.

[0062] FIG. 11 is a perspective view showing inclined surface 23A on which junction box 40 is disposed, and FIG. 12 is a perspective view showing a process of disposing junction box 40 on inclined surface 23A.

[0063] 11 and 12, horizontal portion 23B is formed on inclined surface 23A of case 20. While inclined surface 23A is inclined obliquely with respect to the XY plane, horizontal portion 23B is formed so as to extend in the direction of the XY plane.

[0064] The horizontal portions 23B are provided at positions corresponding to fastening portions 450 between the case 20 and the junction box 40. A stud bolt 470 is disposed on each of the horizontal portions 23B. The stud bolt 470 is provided so as to extend perpendicularly to the horizontal portion 23B. That is, the stud bolt 470 is provided so as to protrude from the horizontal portion 23B in the Z-axis direction.

[0065] 11, the stud bolts 470 are provided at five locations. The five stud bolts 471, 472, 473, 474, and 475 are provided at positions corresponding to the five fastening portions 451, 452, 453, 454, and 455, respectively.

[0066] In order to reduce the height of the battery pack 1, it is necessary to reduce the height of the housing 460 of the junction box 40, and in order to reduce the height of the housing 460, it is necessary to reduce the height of the electrical components housed in the housing 460. In this embodiment, the relay 410 has a shape in which the length in the Z-axis direction (third length) is smaller than the length in the Y-axis direction (first length) and the length in the X-axis direction (second length) when the housing 460 is housed in the case 20. This allows the battery pack 1 to be reduced in height as a whole.

[0067] Fig. 13 is a perspective view showing the structure of fastening portion 450. As shown in Fig. 13, in fastening portion 450, stud bolt 470 is inserted through housing 460, and then nut 470A is screwed onto stud bolt 470. This fixes stud bolt 470 and housing 460. Since stud bolt 470 is attached to case 20, housing 460 is fixed to case 20.

[0068] In this embodiment, fastening portion 450 between case 20 and junction box 40 is configured to be able to absorb a relative error in the X-axis direction between stacks 10A, 10B, 10C and external terminal 50. More specifically, by enlarging the hole diameter in the X-axis direction of a through hole formed in housing 460 to allow stud bolt 470 to pass through fastening portion 450 and relatively increasing the amount of play in the X-axis direction of stud bolt 470 in fastening portion 450, it is possible to absorb the relative error in the X-axis direction between stacks 10A, 10B, 10C and external terminal 50 when fastening housing 460 to case 20.

[0069] For example, let "A" be the play in the X-axis direction of the bolts at fastening parts 480A, 480B that connect the total terminals of laminates 10A, 10B, 10C to the junction box 40 side, let "B" be the play in the X-axis direction of the bolts at fastening parts 430A, 440A that connect fuse mechanism 430 and terminal connection part 440 attached to side wall 22 of case 20 to the junction box 40 side, and let "C" be the play in the X-axis direction of the bolt (stud bolt 470) at fastening part 450 that connects case 20 to the junction box 40 side. A+B <C If the above formula is satisfied, the fastening portion 450 can absorb the relative error between the laminates 10A, 10B, 10C and the external terminals 50.

[0070] In one example, A is about 1.25 mm, B is about 0.5 mm, and C is about 2.3 mm, but the present technology is not limited to this.

[0071] According to the battery pack 1 of this embodiment, the fastening portion 450 that fastens the housing 460 of the junction box 40 to the case 20 can absorb the relative error between the laminates 10A, 10B, 10C and the external terminal 50 in the X-axis direction, so that the housing 460 that houses electrical components such as the relay 410 can be firmly fixed to the case 20 while overcoming the space constraints within the case 20.

[0072] 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]

[0073] 1 battery pack, 10, 10A, 10B, 10C laminate, 11 separator, 11A protrusion, 20 case, 21, 22 side wall, 23 bottom surface, 23A inclined surface, 23B horizontal portion, 30, 30A, 30B, 30C bus bar module, 40 junction box, 50 external terminal, 60 board unit, 60A fastening portion, 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, 310 plate member, 311, 312 end surface, 313 through hole, 314 wall portion, 314A first portion, 314B second part, 314C third part, 315 rib, 316 lock, 317 projection, 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, 410, 411, 412 relay, 411A, 412A center of gravity, 420 resistor, 430 fuse mechanism, 430A fastening portion, 431 first part, 432 second part, 440, 441, 442 terminal connection portion, 440A fastening portion, 450, 451, 452, 453, 454, 455 fastening portion, 460 Enclosures, 470, 471, 472, 473, 474, 475 Stud bolts, 470A Nuts, 480, 481, 482, 483, 484, 485, 486 Bus bars, 480A, 480B Fasteners, 1100 Wiring, 1200 Screws.

Claims

1. A stack including a plurality of battery cells aligned in a first direction; an electrical device including an electrical component electrically connected to the plurality of battery cells and a housing that houses the electrical component; a case for housing the laminate and the electrical device; an external terminal provided on the case and electrically connected to the electrical component; the laminate, the electric device, and the external terminal are arranged along a second direction perpendicular to the first direction such that the electric device is located between the laminate and the external terminal; a fastening portion is provided to fasten the housing and the case of the electrical device, The fastening portion is configured to be capable of absorbing a relative error between the stack and the external terminal in the second direction.

2. The battery pack according to claim 1 , wherein the case has a side wall facing the laminate in the first direction.

3. the fastening portion includes a stud bolt fixed to the case, 3. The battery pack according to claim 1, wherein the stud bolt is provided along a third direction perpendicular to the first direction and the second direction.

4. The electrical component includes a relay, 3. The battery pack according to claim 1, wherein the fastening portions are disposed at at least three points surrounding a center of gravity of the relay when viewed from a third direction perpendicular to the first direction and the second direction.

5. The electrical component includes a relay, 3. The battery pack of claim 1, wherein the relay has a first length along the first direction, a second length along the second direction, and a third length along a third direction perpendicular to the first direction and the second direction, the third length being smaller than the first length and the second length.

6. a bus bar module disposed on the stack and including a bus bar that electrically connects the plurality of battery cells and a plate member that houses the bus bar; The battery pack according to claim 1 , wherein the bus bar module has a positioning mechanism that positions the bus bar module in at least one of the first direction and the second direction.

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