Battery pack

Abstract

The invention relates to a battery pack. The laminated body (10), the electrical device (40), and the external terminal (50) are disposed along a second direction orthogonal to the first direction, the electrical device (40) is located between the laminated body (10) and the external terminal (50), a fastening portion (450) for fastening a housing (460) of the electrical device (40) and the housing (20) is provided, and the fastening portion (450) is configured to be capable of absorbing a relative error between the laminated body (10) and the external terminal (50) in the second direction.

Description

Technical Field

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

[0002] As described in the specification of Chinese Utility Model No. 213071279, there is conventionally known a technology for accommodating a plurality of battery cells in a case to form a battery pack. Summary of the invention

[0003] The energy density of battery packs needs to be increased. When fixing a frame that accommodates electrical components to a housing of a battery pack, space constraints are becoming increasingly severe.

[0004] An object of the present invention is to provide a battery pack that can overcome space limitations and firmly fix a frame that accommodates electrical components to a housing.

[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; an electrical device including an electrical component electrically connected to the plurality of battery cells and a frame for accommodating the electrical component; a housing for accommodating the stack and the electrical device; and an external terminal provided on the housing and electrically connected to the electrical component, wherein the stack, the electrical device and the external terminal are arranged along a second direction orthogonal to the first direction, the electrical device is located between the stack and the external terminal, and a fastening portion is provided for fastening the frame of the electrical device to the housing, wherein the fastening portion is configured to absorb a relative error between the stack and the external terminal in the second direction.

[0007] [2] In the battery pack described in [1], the case has a side wall facing the stacked body from the first direction.

[0008] [3] In the battery pack described in [1] or [2], the fastening portion includes a stud bolt fixed to the housing, and the stud bolt is arranged along a third direction that is orthogonal to the first direction and the second direction.

[0009] [4] In the battery pack described in any one of [1] to [3], the electrical component includes a relay, and the fastening portion is arranged at at least three points surrounding the center of gravity of the relay when viewed from a third direction orthogonal to the first direction and the second direction.

[0010] [5] In the battery pack described in any one of [1] to [4], the electrical component includes a relay having a first length along a first direction, a second length along a second direction, and a third length along a third direction orthogonal to the first direction and the second direction, the third length being smaller than the first length and the second length.

[0011] [6] In the battery pack described in any one of [1] to [5], the battery pack further comprises a busbar module, the busbar module comprising a busbar arranged on a stack and electrically connecting a plurality of battery cells and a plate member for accommodating 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.

[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 an inclined surface where a junction box is arranged.

[0024] Fig.12 It means in Fig.11 A perspective view of the process of configuring the junction box on an inclined surface is shown.

[0025] Fig.13 It is a perspective view showing the fastening portion between the housing and the junction box. DETAILED DESCRIPTION

[0026] 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.

[0027] 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.

[0028] 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 other structures other than the structure may not be included.

[0029] 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.).

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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 .

[0037] 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.

[0038] 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.

[0039] 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).

[0040] 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.

[0041] 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.

[0042] 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 .

[0043] Next, use Figure 3 and Figure 4 , the basic structure of the busbar module 30 is described. Figure 3 3 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 .

[0044] 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.

[0045] like Figure 4As shown, busbars 320 are stored 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] use Figures 5 to 8 , a positioning mechanism of the bus bar module 30 (plate member 310 ) in the present embodiment will be described.

[0051] Figure 5 2 is a diagram showing the positioning mechanism of the busbar module 30 in the Y-axis direction. Figure 5As 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 .

[0052] 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.

[0053] 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.

[0054] 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.

[0055] Figure 6 It is a perspective view showing the structure between the bus bar module 30 and the upper surface 121 of the battery cell 100 .

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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 .

[0064] 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.

[0065] 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 ).

[0066] 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.

[0067] 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 .

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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 .

[0072] 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 configured to extend from the busbar module 30C to the junction box 40. Alternatively, the entire substrate unit 60 may be configured to be located on the busbar module 30. The substrate unit 60 is fastened to the junction box 40 at the fastening portion 60A. After the substrate unit 60 is fastened to the junction box 40, the junction box 40 is fixed to the bottom surface 23 of the housing 20 at the fastening portion 450.

[0073] Fig.11 2 is a perspective view showing the inclined surface 23A on which the junction box 40 is arranged. Fig.12 It is a perspective view showing a process of arranging the junction box 40 on the inclined surface 23A.

[0074] like Fig.11 , Fig.12 As shown, a horizontal portion 23B is formed on an inclined surface 23A of the housing 20. The inclined surface 23A is inclined obliquely with respect to the XY plane, and the horizontal portion 23B is formed to extend in the direction of the XY plane.

[0075] The plurality of horizontal portions 23B are provided at positions corresponding to the fastening portions 450 of the housing 20 and the junction box 40. A stud bolt 470 is disposed on each horizontal portion 23B. The stud bolt 470 is provided to extend perpendicularly to the horizontal portion 23B. That is, the stud bolt 470 is provided to protrude from the horizontal portion 23B in the Z-axis direction.

[0076] exist Fig.11In the example shown, five stud bolts 470 are provided. Five stud bolts 471, 472, 473, 474, 475 are provided at positions corresponding to the five fastening portions 451, 452, 453, 454, 455, respectively.

[0077] In order to reduce the height of the battery pack 1, the frame 460 of the junction box 40 needs to be reduced in height, and in order to reduce the height of the frame 460, the electrical components housed in the frame 460 need to be reduced in height. In the present 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 frame 460 is housed in the housing 20. Thus, the overall height of the battery pack 1 can be reduced.

[0078] Fig.13 4 is a perspective view showing the structure of the fastening portion 450. Fig.13 As shown, in the fastening part 450, after the stud bolt 470 passes through the frame 460, the nut 470A is threadedly engaged with the stud bolt 470. Thus, the stud bolt 470 is fixed to the frame 460. Since the stud bolt 470 is attached to the housing 20, the frame 460 is fixed to the housing 20.

[0079] In the present embodiment, the fastening portion 450 of the housing 20 and the junction box 40 is configured to absorb the relative error between the stacked bodies 10A, 10B, 10C and the external terminal 50 in the X-axis direction. More specifically, the amount of play in the X-axis direction of the stud bolt 470 at the fastening portion 450 is relatively increased by enlarging the aperture in the X-axis direction of the through hole formed in the frame body 460 in the fastening portion 450 for passing the stud bolt 470, so that the relative error between the stacked bodies 10A, 10B, 10C and the external terminal 50 in the X-axis direction can be absorbed when the frame body 460 is fastened to the housing 20.

[0080] For example, when the clearance in the X-axis direction of the bolts at the fastening parts 480A and 480B connecting the main terminals of the stack 10A, 10B, and 10C to the terminal box 40 side is set to "A", the clearance in the X-axis direction of the bolts at the fastening parts 430A and 440A connecting the fuse mechanism 430 and the terminal connecting part 440 installed on the side wall 22 of the shell 20 to the terminal box 40 side is set to "B", and the clearance in the X-axis direction of the bolts (stud bolts 470) at the fastening part 450 connecting the shell 20 to the terminal box 40 side is set to "C", if A+B<C holds, the relative error between the stack 10A, 10B, and 10C and the external terminal 50 can be absorbed by the fastening part 450.

[0081] 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 invention is not limited thereto.

[0082] According to the battery pack 1 of this embodiment, the fastening portion 450 that fastens the frame 460 of the junction box 40 to the shell 20 can absorb the relative error between the stack 10A, 10B, 10C and the external terminal 50 in the X-axis direction. Therefore, the frame 460 that accommodates electrical components such as the relay 410 can be firmly fixed to the shell 20 while overcoming the limitation of the space inside the shell 20.

[0083] 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; an electrical device comprising an electrical element electrically connected to the plurality of battery cells and a frame housing the electrical element; a housing that accommodates the stack and the electrical device; as well as an external terminal, which is disposed on the housing and is electrically connected to the electrical element, The laminate, the electrical device, and the external terminal are arranged along a second direction orthogonal to the first direction, and the electrical device is located between the laminate and the external terminal. A fastening portion is provided for fastening the frame of the electrical device to the housing. The fastening portion is configured to absorb a relative error between the stacked body and the external terminal in the second direction.

2. The battery pack according to claim 1, wherein: The housing has a side wall facing the stacked body from the first direction.

3. The battery pack according to claim 1 or 2, wherein: The fastening portion includes a stud bolt fixed to the housing, The stud bolts are disposed along a third direction that is orthogonal to the first direction and the second direction.

4. The battery pack according to claim 1 or 2, wherein: The electrical component includes a relay, The fastening portions are arranged at at least three points surrounding the center of gravity of the relay when viewed from a third direction that is orthogonal to the first direction and the second direction.

5. The battery pack according to claim 1 or 2, wherein: The electrical component includes a relay, 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 orthogonal to the first direction and the second direction, the third length being smaller than the first length and the second length.

6. The battery pack according to claim 1 or 2, wherein: The battery pack further includes a bus bar module including a bus bar that is arranged on the stack and electrically connects the plurality of battery cells and a plate member that accommodates the bus bar. The bus bar module includes a positioning mechanism for positioning the bus bar module in at least one of the first direction and the second direction.

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