Power storage device and vehicle

Abstract

A power storage device (1) comprises: a plurality of first power storage stacks (110); a plurality of second power storage stacks (120); a plurality of bus bars; a case (500) including one-side space (S1); and a pressure release valve (600). The pressure release valve (600) is provided on a regulation part (511). The plurality of first power storage stacks (110) include a first proximity stack group (ST11) including a first closest stack (111), and a first remainder stack group (ST12). The plurality of second power storage stacks (120) include a second proximity stack group (ST21) including a second closest stack (121), and a second remainder stack group (ST22). The plurality of bus bars have a first outer wiring part (211), a second outer wiring part (212), inner wiring parts (220), a first coupling wiring part (231), and a second coupling wiring part (232).

Description

Electricity storage device and vehicle

[0001] The present disclosure relates to a power storage device and a vehicle.

[0002] For example, Japanese Patent Publication No. 2022-516519 discloses a power battery pack including a plurality of cells, a battery tray that houses the cells, and a cover plate connected to the battery tray. A battery pack explosion-proof valve is attached to the side wall of the battery tray and is attached to an exhaust hole.

[0003] Special Publication No. 2022-516519

[0004] In JP-A 2022-516519, there is a concern that when gas is discharged from the explosion-proof valve of the battery pack, the heat of the gas may damage the bus bars connecting the unit cells to each other.

[0005] An object of the present disclosure is to provide an electricity storage device and a vehicle that can suppress damage to bus bars caused by gas heat.

[0006] A power storage device according to one aspect of the present disclosure includes: a plurality of first power storage stacks arranged to be aligned along a first direction; a plurality of second power storage stacks facing the plurality of first power storage stacks in a second direction orthogonal to both the first direction and a vertical direction and arranged to be aligned along the first direction; a plurality of bus bars connecting a pair of opposing power storage stacks among the plurality of first power storage stacks and the plurality of second power storage stacks; and a power storage device that houses the plurality of first power storage stacks, the plurality of second power storage stacks, and the plurality of bus bars and is arranged to be aligned along the first direction. and a pressure release valve provided in the case and configured to release pressure inside the case, wherein the case has a defining portion that defines the one-side space, the pressure release valve is provided in the defining portion, the plurality of first storage stacks include a first adjacent stack group including a first nearest stack arranged at a position closest to the pressure release valve in the first direction, and a first remaining stack group other than the first adjacent stack group, and the plurality of second storage stacks The stack includes a second adjacent stack group including a second nearest stack arranged at a position nearest to the pressure release valve in the first direction, and a second remaining stack group other than the second adjacent stack group, and the plurality of bus bars include a first outer routing portion routed so as to pass outside the first adjacent stack group in the second direction, a second outer routing portion routed so as to pass outside the second adjacent stack group in the second direction, an inner routing portion routed so as to pass between the first remaining stack group and the second remaining stack group, and a first connecting wiring section that is wired to pass between the first power storage stack that is arranged at a position farthest from the pressure release valve among the power storage stacks and the first power storage stack that is arranged at a position nearest to the pressure release valve among the first power storage stacks that constitute the first remaining stack group; the second power storage stack that is arranged at a position farthest from the pressure release valve among the second power storage stacks that constitute the second nearby stack group; and the second power storage stack that is arranged at a position nearest to the pressure release valve among the second power storage stacks that constitute the second remaining stack group.and a second connecting wiring portion that is wired so as to pass between the

[0007] According to the present disclosure, it is possible to provide an electricity storage device and a vehicle that are capable of suppressing damage to the bus bar caused by the heat of gas.

[0008] FIG. 6 is a perspective view schematically showing an electric storage device according to an embodiment of the present disclosure. FIG. 7 is a perspective view schematically showing a state in which an upper cover and a cover plate are removed from the electric storage device shown in FIG. 1. FIG. 8 is a plan view schematically showing a state in which an upper cover is removed from the electric storage device. FIG. 9 is a cross-sectional view taken along line IV-IV in FIG. 3. FIG. 10 is a cross-sectional view taken along line V-V in FIG. 3. FIG. 11 is a plan view schematically showing a modified example of the electric storage device. FIG. 12 is a cross-sectional view taken along line VII-VII in FIG. 6. FIG. 13 is a plan view schematically showing a modified example of the electric storage device.

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] The present disclosure will be described with reference to the accompanying drawings, in which the same or corresponding elements are designated by the same reference numerals.

[0010] Fig. 1 is a perspective view that schematically shows an electric storage device according to an embodiment of the present disclosure. Fig. 2 is a perspective view that schematically shows a state in which an upper cover and a covering plate are removed from the electric storage device shown in Fig. 1. Fig. 3 is a plan view that schematically shows a state in which the upper cover and the covering plate are removed from the electric storage device. Fig. 4 is a cross-sectional view taken along line IV-IV in Fig. 1. This electric storage device 1 is mounted, for example, on the bottom of a vehicle.

[0011] As shown in Figures 1 to 5, the energy storage device 1 includes a plurality of first energy storage stacks 110, a plurality of second energy storage stacks 120, a plurality of bus bars 200, a first junction box 310, a second junction box 320, a covering plate 400, a case 500, a pressure release valve 600, and a breathing membrane 700.

[0012] The multiple first power storage stacks 110 are arranged side by side in the first direction. In this embodiment, the multiple first power storage stacks 110 include six first power storage stacks 110. However, the number of first power storage stacks 110 is not limited to six. Each first power storage stack 110 is formed in a rectangular parallelepiped shape that is long in a second direction that is perpendicular to both the first direction and the up-down direction. Each first power storage stack 110 has a pair of external terminals (not shown) provided on a side surface in the second direction.

[0013] Each first power storage stack 110 includes a plurality of power storage cells 101 (see FIGS. 3 and 4 ). The plurality of power storage cells 101 are arranged, for example, to be aligned in a first direction. Note that the plurality of power storage cells 101 may also be arranged to be aligned in a second direction. Each power storage cell 101 may be configured as a so-called laminated cell having a laminated exterior body, or as a so-called prismatic cell formed in a flat rectangular parallelepiped shape. An example of each power storage cell 101 is a lithium ion battery. Each power storage cell 101 may also be configured as an all-solid-state battery using a solid electrolyte.

[0014] The multiple second power storage stacks 120 are arranged to face the multiple first power storage stacks 110 in the second direction and to be aligned in the first direction. In the present embodiment, the multiple second power storage stacks 120 include six second power storage stacks 120. However, the number of second power storage stacks 120 is not limited to six. The configuration of each second power storage stack 120 is the same as the configuration of the first power storage stack 110. Each second power storage stack 120 has an external terminal (not shown) provided on a side surface in the second direction.

[0015] The multiple bus bars 200 electrically connect a pair of opposing power storage stacks among the multiple first power storage stacks 110 and the multiple second power storage stacks 120. The direction in which a pair of power storage stacks "faces" each other includes not only the first direction and the second direction, but also a direction intersecting both the first direction and the second direction in a plane including the first direction and the second direction (for example, a diagonal direction in FIG. 3 ). Details of the multiple bus bars 200 will be described later.

[0016] The case 500 accommodates a plurality of first power storage stacks 110, a plurality of second power storage stacks 120, and a plurality of bus bars 200. The case 500 includes a one-side space S1 formed on one side of the plurality of first power storage stacks 110 and the plurality of second power storage stacks 120 in the first direction. The case 500 has a lower case 510 and an upper cover 520.

[0017] The lower case 510 is open upward and has a bottom wall 512, a peripheral wall 514, a first partition 516, and a second partition 518.

[0018] The bottom wall 512 supports each of the power storage stacks 110 and 120 .

[0019] The peripheral wall 514 stands upright from the peripheral edge of the bottom wall 512. The peripheral wall 514 surrounds the periphery of the plurality of first power storage stacks 110 and the plurality of second power storage stacks 120. The peripheral wall 514 is formed in a substantially rectangular cylindrical shape.

[0020] The peripheral wall 514 includes a side wall 514a that faces the plurality of first power storage stacks 110 and the plurality of second power storage stacks 120 across the one side space S1. The side wall 514a extends along the second direction. The side wall 514a may be inclined so as to gradually extend outward in the first direction as it extends upward, or may be perpendicular to the bottom wall 512.

[0021] The first partition 516 separates the multiple first power storage stacks 110 and the multiple second power storage stacks 120. The first partition 516 has a shape that extends along a first direction. An end of the first partition 516 in the first direction is connected to the peripheral wall 514. The upper surface of the first partition 516 is located at a height position lower than the upper surfaces of the power storage stacks 110, 120.

[0022] The second partition 518 separates a pair of first power storage stacks 110 adjacent to each other in the first direction, and a pair of second power storage stacks 120 adjacent to each other in the first direction. The second partition 518 has a shape that extends along the second direction. An end of the second partition 518 in the second direction is connected to the peripheral wall 514. The upper surface of the second partition 518 is located lower than the upper surfaces of the power storage stacks 110, 120. However, the upper surface of the second partition 518 may be located at the same height as the upper surfaces of the power storage stacks 110, 120.

[0023] The upper cover 520 closes the opening of the lower case 510. The upper cover 520, together with the lower case 510, houses a plurality of first power storage stacks 110, a plurality of second power storage stacks 120, and a plurality of bus bars 200. The peripheral edge of the upper cover 520 is fixed to the upper end of the peripheral wall 514 by bolts or the like.

[0024] The case 500 has a defining portion 511 that defines the one-side space S1. Portions of the bottom wall 512, the peripheral wall 514, and the upper cover 520 that face the one-side space S1 constitute the defining portion 511. That is, the defining portion 511 is constituted by a portion of the bottom wall 512 on one side of the plurality of first power storage stacks 110 and the plurality of second power storage stacks 120, a portion of the peripheral wall 514 on one side of the plurality of first power storage stacks 110 and the plurality of second power storage stacks 120, and a portion of the upper cover 520 on one side of the plurality of first power storage stacks 110 and the plurality of second power storage stacks 120.

[0025] The first junction box 310 is disposed in the one-side space S1. The first junction box 310 houses a relay, a fuse, and the like. The first junction box 310 has a first connector 312. The first connector 312 protrudes from the side wall 514a in the first direction.

[0026] The second junction box 320 is disposed in the one-side space S1. The second junction box 320 is disposed in a position facing the second power storage stack 120 in the first direction and facing the first junction box 310 at an interval in the second direction. The second junction box 320 houses a relay, a fuse, and the like. The second junction box 320 has a second connector 322. The second connector 322 protrudes from the side wall 514a in the first direction.

[0027] The pressure release valve 600 is provided in the case 500. The pressure release valve 600 releases the pressure inside the case 500. The pressure release valve 600 opens when the pressure inside the case 500 reaches or exceeds a reference value. The pressure release valve 600 is configured as a check valve.

[0028] The pressure release valve 600 is provided in the defining portion 511 of the case 500. As shown in Fig. 3 , the pressure release valve 600 is provided in a portion of the upper cover 520 above the one-side space S1. Note that in Fig. 3 , the pressure release valve 600 is indicated by a two-dot chain line. In this embodiment, the pressure release valve 600 is provided in a portion of the upper cover 520 above the space between the first junction box 310 and the second junction box 320.

[0029] The breathing membrane 700 is provided on the case 500. The breathing membrane 700 adjusts the pressure inside the case 500 by allowing gas to pass between the inside and outside of the case 500. The breathing membrane 700 is preferably provided on the defining portion 511. As shown in FIGS. 1 to 3, the breathing membrane 700 is provided on the side wall 514a.

[0030] Here, the plurality of bus bars 200 will be described in detail. As shown in Figures 2 and 3 , the plurality of bus bars 200 includes a first outer wiring portion 211, a second outer wiring portion 212, an inner wiring portion 220, a first connecting wiring portion 231, and a second connecting wiring portion 232.

[0031] The first outer routing portion 211 is routed so as to pass outside the first adjacent stack group ST11 in the second direction. The first adjacent stack group ST11 refers to at least one first power storage stack 110 among the multiple first power storage stacks 110 that is arranged in a position close to the pressure release valve 600 in the first direction. In the present embodiment, the first adjacent stack group ST11 includes two first power storage stacks 110. The first adjacent stack group ST11 includes a first nearest stack 111 (see FIG. 3 ) among the multiple first power storage stacks 110 that is arranged in a position closest to the pressure release valve 600 in the first direction. The first nearest stack 111 faces the first junction box 310. The first power storage stacks 110 constituting the first adjacent stack group ST11 are arranged with a pair of external terminals facing outward in the second direction. Note that the first adjacent stack group ST11 may be composed of only the first nearest stack 111.

[0032] In the present embodiment, one first outer wiring portion 211 connects the first junction box 310 and the first nearest stack 111 to each other. The other first outer wiring portion 211 connects the first nearest stack 111 to the first power storage stack 110 that faces the first nearest stack 111 in the first direction to each other.

[0033] The second outer routing portion 212 is routed so as to pass outside the second adjacent stack group ST21 in the second direction. The second adjacent stack group ST21 refers to at least one second power storage stack 120 among the multiple second power storage stacks 120 that is arranged in a position close to the pressure release valve 600 in the first direction. In the present embodiment, the second adjacent stack group ST21 includes two second power storage stacks 120. The second adjacent stack group ST21 includes a second-closest stack 121 (see FIG. 3 ) among the multiple second power storage stacks 120 that is arranged in a position closest to the pressure release valve 600 in the first direction. The second-closest stack 121 faces the second junction box 320. The second power storage stacks 120 that constitute the second adjacent stack group ST21 are arranged with a pair of external terminals facing outward in the second direction. Note that the second adjacent stack group ST21 may be composed of only the second-closest stack 121.

[0034] In the present embodiment, one second outer wiring portion 212 connects the second junction box 320 and the second nearest stack 121 to each other. The other second outer wiring portion 212 connects the second nearest stack 121 to the second power storage stack 120 that faces the second nearest stack 121 in the first direction to each other.

[0035] The inner wiring section 220 is arranged to pass between the first remnant stack group ST12 and the second remnant stack group ST22.

[0036] The first remaining stack group ST12 refers to at least one first power storage stack 110 other than the first adjacent stack group ST11 among the plurality of first power storage stacks 110. In the present embodiment, the first remaining stack group ST12 includes four first power storage stacks 110. The first power storage stacks 110 constituting the first remaining stack group ST12 are arranged with a pair of external terminals facing inward in the second direction.

[0037] The second remaining stack group ST22 refers to at least one second power storage stack 120 other than the second adjacent stack group ST21 among the plurality of second power storage stacks 120. In the present embodiment, the second remaining stack group ST22 includes four second power storage stacks 120. The second power storage stacks 120 constituting the second remaining stack group ST22 are arranged with a pair of external terminals facing inward in the second direction.

[0038] As shown in FIG. 3 , the inner wiring section 220 has a first inner wiring section 221 , a second inner wiring section 222 , and a third inner wiring section 223 .

[0039] The first inner wiring portion 221 connects a pair of first power storage stacks 110 adjacent to each other in the first direction among the plurality of first power storage stacks 110 constituting the first remaining stack group ST12.

[0040] The second inner wiring portion 222 connects a pair of second power storage stacks 120 adjacent to each other in the first direction among the plurality of second power storage stacks 120 constituting the second remaining stack group ST22.

[0041] The third inner wiring section 223 connects the first storage stack 110 that is located farthest from the pressure release valve 600 among the multiple first storage stacks 110, and the second storage stack 120 that is located farthest from the pressure release valve 600 among the multiple second storage stacks 120.

[0042] The first connecting wiring portion 231 is arranged to pass between the first power storage stack 110 of the first adjacent stack group ST11 that is arranged at a position farthest from the pressure release valve 600, and the first power storage stack 110 of the first remaining stack group ST12 that is arranged at a position closest to the pressure release valve 600. The first connecting wiring portion 231 adjoins the first power storage stack 110 of the first adjacent stack group ST11 that is arranged at a position farthest from the pressure release valve 600, and the first power storage stack 110 of the first remaining stack group ST12 that is arranged at a position closest to the pressure release valve 600.

[0043] The second connecting wiring portion 232 is arranged to pass between the second power storage stack 120 arranged in a position farthest from the pressure release valve 600 among the second adjacent stack group ST21 and the second power storage stack 120 arranged in a position nearest to the pressure release valve 600 among the second remaining stack group ST22. The second connecting wiring portion 232 adjoins the second power storage stack 120 arranged in a position farthest from the pressure release valve 600 among the second adjacent stack group ST21 and the second power storage stack 120 arranged in a position nearest to the pressure release valve 600 among the second remaining stack group ST22.

[0044] The covering plate 400 (see FIG. 4 ) covers at least the inner wiring section 220 from above. The covering plate 400 is disposed between the plurality of first power storage stacks 110 constituting the first remaining stack group ST12 and the plurality of second power storage stacks 120 constituting the second remaining stack group ST22. The covering plate 400 extends along the first direction. The covering plate 400 is formed in a flat plate shape. The covering plate 400 is made of an insulating material. The covering plate 400 is made of, for example, mica, which is a natural inorganic mineral solidified by heat pressing. The covering plate 400 has a function of blocking gas ejected upward from any of the power storage stacks from contacting the inner wiring section 220. Note that the covering plate 400 is not shown in FIGS. 2 and 3 .

[0045] 5 shows a cross section of a vehicle including the above-described power storage device 1 and a body frame 10. The power storage device 1 is attached to a lower portion of the body frame 10. The body frame 10 has a cross frame 11 and pillars 12.

[0046] The cross frame 11 extends in the width direction of the vehicle (a direction perpendicular to the plane of the paper in FIG. 5 ). In this embodiment, the body frame 10 has at least two cross frames 11 spaced apart from each other in the front-rear direction of the vehicle.

[0047] The front cross frame 11 is provided above the first power storage stack 110, which is located farthest from the pressure release valve 600 among the multiple first power storage stacks 110 constituting the first proximity stack group ST11, and the second power storage stack 120 which faces the first power storage stack 110 in the second direction. In other words, the first proximity stack group ST11 and the second proximity stack group ST21 overlap with the cross frame 11 in the vertical direction.

[0048] The rear cross frame 11 is provided above two first storage stacks 110 that are positioned close to the pressure release valve 600 in the first remaining stack group ST12, and two second storage stacks 120 that face these two first storage stacks 110 in the second direction.

[0049] The pillar 12 is provided between the two cross frames 11 .

[0050] As described above, in the energy storage device 1 of this embodiment, the outer routing portions 211, 212 are arranged to pass outside the adjacent stack groups ST12, ST22 that are arranged relatively close to the pressure release valve 600, which prevents damage to the outer routing portions 211, 212 due to the thermal effect of the gas when the gas discharged from one of the energy storage stacks is released through the pressure release valve 600. Furthermore, the inner routing portion 220 is arranged to pass between the remaining stack groups ST12, ST22, which prevents damage to the inner routing portion 220 when a load is input to the case 500 in the second direction.

[0051] In addition, when a load is input in the second direction to a vehicle equipped with the storage device 1 and the body frame 10, the load is mainly received by the cross frame 11 and the pillar 12, thereby suppressing damage to each outer wiring section 211, 212.

[0052] Modifications of the above embodiment will now be described.

[0053] 6 and 7 , the case 500 may further include a partition wall 519 that separates the first inner wiring section 221 and the second inner wiring section 222. The partition wall 519 is disposed on the first partition section 516. One end of the partition wall 519 in the first direction may be located between each of the adjacent stack groups ST11, ST21 and each of the remaining stack groups ST12, ST22. The other end of the partition wall 519 in the first direction is located near the third inner wiring section 223. The upper surface of the partition wall 519 may be connected to the lower surface of the cover plate 400.

[0054] 8 , the energy storage device 1 may further include a third power storage stack 130. The third power storage stack 130 is arranged on the side of the case 500 opposite to the side on which the one-side space S1 is located, with respect to the plurality of first power storage stacks 110 and the plurality of second power storage stacks 120. In this example, the third inner wiring portion 223 connects the first power storage stack 110 that is arranged farthest from the pressure release valve 600 among the plurality of first power storage stacks 110 to the third power storage stack 130, and also connects the second power storage stack 120 that is arranged farthest from the pressure release valve 600 among the plurality of second power storage stacks 120 to the third power storage stack 130.

[0055] 9 , the first connecting route portion 231 may connect the first power storage stack 110, which is arranged in the first adjacent stack group ST11 at a position farthest from the pressure release valve 600, to the second power storage stack 120, which is arranged in the second remaining stack group ST22 at a position closest to the pressure release valve 600, adjacent to each other. The second connecting route portion 232 may connect the second power storage stack 120, which is arranged in the second adjacent stack group ST21 at a position farthest from the pressure release valve 600, to the first power storage stack 110, which is arranged in the first remaining stack group ST12 at a position closest to the pressure release valve 600, adjacent to each other.

[0056] In this embodiment, the arrangement of the positive and negative external terminals in each of the power storage stacks 110 and 120 is standardized in all the power storage stacks.

[0057] It will be appreciated by those skilled in the art that the exemplary embodiments described above are examples of the following aspects.

[0058] a plurality of first power storage stacks arranged to be lined up along a first direction; a plurality of second power storage stacks facing the plurality of first power storage stacks in a second direction orthogonal to both the first direction and the up-down direction and arranged to be lined up along the first direction; a plurality of bus bars connecting a pair of power storage stacks facing each other out of the plurality of first power storage stacks and the plurality of second power storage stacks; a case accommodating the plurality of first power storage stacks, the plurality of second power storage stacks, and the plurality of bus bars and including a one-side space formed on one side of the plurality of first power storage stacks and the plurality of second power storage stacks in the first direction; and a pressure release valve provided in the case and releasing pressure inside the case, wherein the case has a defining portion that defines the one-side space, and the pressure release valve is provided in the defining portion, and the plurality of first power storage stacks include: a first adjacent stack group including a first nearest stack arranged at a position closest to the pressure release valve in the first direction; and a first remaining stack group other than the first adjacent stack group, the plurality of second electric storage stacks include: a second adjacent stack group including a second nearest stack arranged in a position closest to the pressure release valve in the first direction; and a second remaining stack group other than the second adjacent stack group, and the plurality of bus bars include: a first outer routing portion arranged to pass outside the first adjacent stack group in the second direction; a second outer routing portion arranged to pass outside the second adjacent stack group in the second direction; an inner routing portion arranged to pass between the first remaining stack group and the second remaining stack group; and a first connecting routing portion arranged to pass between the first electric storage stack arranged farthest from the pressure release valve among the first electric storage stacks constituting the first adjacent stack group and the first electric storage stack arranged closest to the pressure release valve among the first electric storage stacks constituting the first remaining stack group.a second connecting wiring section that is wired to pass between the second storage stack that is located farthest from the pressure release valve among the second storage stacks that constitute the second adjacent stack group, and the second storage stack that is located closest to the pressure release valve among the second storage stacks that constitute the second remaining stack group.

[0059] In this energy storage device, since each outer routing section is routed to pass outside each adjacent stack group that is located relatively close to the pressure release valve, damage to each outer routing section due to the thermal effect of the gas when gas discharged from one of the energy storage stacks is released through the pressure release valve is suppressed. Furthermore, since the inner routing section is arranged to pass between each remaining stack group, damage to the inner routing section is suppressed when a load is input to the case in the second direction.

[0060] [Aspect 2] The power storage device according to aspect 1, further comprising a cover plate disposed between the first remaining stack group and the second remaining stack group, the cover plate covering the inner wiring portion from above.

[0061] In this aspect, gas discharged from any one of the power storage stacks is prevented from coming into contact with the inner routed portion.

[0062] [Aspect 3] The energy storage device according to Aspect 1 or 2, wherein the inner wiring section has a first inner wiring section that connects a pair of the first storage stacks that are adjacent to each other in the first direction, and a second inner wiring section that connects a pair of the second storage stacks that are adjacent to each other in the first direction, and the case further has a partition wall that separates the first inner wiring section from the second inner wiring section.

[0063] In this aspect, when a load is input to the case in the second direction, a short circuit between the first inner routing portion and the second inner routing portion is suppressed.

[0064] [Mode 4] The storage device according to claim 1, wherein the case has a lower case that opens upward and an upper cover that closes the opening of the lower case, the lower case has a bottom wall and a peripheral wall that stands up from the peripheral edge of the bottom wall and surrounds the plurality of first storage stacks and the plurality of second storage stacks, and the defining portion is formed by a portion of the bottom wall that is on one side of the plurality of first storage stacks and the plurality of second storage stacks, a portion of the peripheral wall that is on one side of the plurality of first storage stacks and the plurality of second storage stacks, and a portion of the upper cover that is on one side of the plurality of first storage stacks and the plurality of second storage stacks.

[0065] [Aspect 5] A vehicle comprising: a body frame; and the power storage device according to any one of Aspects 1 to 4, the power storage device being attached to the body frame; the body frame including a cross frame extending along the width direction of the vehicle; and the first adjacent stack group and the second adjacent stack group overlapping the cross frame in the vertical direction.

[0066] In this vehicle, when a load is input to the vehicle in the second direction, the load is mainly received by the cross frame, and therefore damage to each outer wiring portion is suppressed.

[0067] It should be noted that the embodiments disclosed herein are illustrative in all respects and should not be considered limiting. The scope of the present disclosure is defined by the claims, not by the description of the above embodiments, and further includes all modifications within the meaning and scope of the claims.

[0068] REFERENCE SIGNS LIST 1 Energy storage device, 10 Vehicle body frame, 11 Cross frame, 12 Pillar, 110 First energy storage stack, 111 First nearest stack, 120 Second energy storage stack, 121 Second nearest stack, 200 Bus bar, 211 First outer wiring portion, 212 Second outer wiring portion, 220 Inner wiring portion, 231 First connecting wiring portion, 232 Second connecting wiring portion, 310 First junction box, 312 First connector, 320 Second junction box, 322 Second connector, 400 Covering plate, 500 Case, 510 Lower case, 511 Defining portion, 512 Bottom wall, 514 Peripheral wall, 514a Side wall, 516 First partition portion, 518 Second partition portion, 519 Partition wall, 520 Upper cover, 600 Pressure release valve, 700 Breathing membrane, ST11 first adjacent stack group, ST12 first remaining stack group, ST21 second adjacent stack group, ST22 second remaining stack group.

Claims

1. A power storage device comprising: a plurality of first storage stacks arranged to be lined up along a first direction; a plurality of second storage stacks facing the plurality of first storage stacks in a second direction orthogonal to both the first direction and the up-and-down direction and arranged to be lined up along the first direction; a plurality of bus bars connecting a pair of storage stacks facing each other out of the plurality of first storage stacks and the plurality of second storage stacks; a case accommodating the plurality of first storage stacks, the plurality of second storage stacks, and the plurality of bus bars and including a one-side space formed on one side of the plurality of first storage stacks and the plurality of second storage stacks in the first direction; and a pressure release valve provided in the case and releasing pressure inside the case, wherein the case has a defining portion that defines the one-side space, the pressure release valve is provided in the defining portion, and the plurality of first storage stacks include: a first adjacent stack group including a first nearest stack arranged at a position closest to the pressure release valve in the first direction; and a first remaining stack group other than the first adjacent stack group, the plurality of second electric storage stacks include: a second adjacent stack group including a second nearest stack arranged in a position closest to the pressure release valve in the first direction; and a second remaining stack group other than the second adjacent stack group, and the plurality of bus bars include: a first outer routing portion arranged to pass outside the first adjacent stack group in the second direction; a second outer routing portion arranged to pass outside the second adjacent stack group in the second direction; an inner routing portion arranged to pass between the first remaining stack group and the second remaining stack group; and a first connecting routing portion arranged to pass between the first electric storage stack arranged farthest from the pressure release valve among the first electric storage stacks constituting the first adjacent stack group and the first electric storage stack arranged closest to the pressure release valve among the first electric storage stacks constituting the first remaining stack group.a second connecting wiring section that is wired to pass between the second storage stack that is located farthest from the pressure release valve among the second storage stacks that constitute the second adjacent stack group, and the second storage stack that is located closest to the pressure release valve among the second storage stacks that constitute the second remaining stack group.

2. The energy storage device according to claim 1, further comprising a cover plate disposed between the first remaining stack group and the second remaining stack group, and covering the inner wiring portion from above.

3. The storage device described in claim 1, wherein the inner wiring section has a first inner wiring section connecting a pair of the first storage stacks adjacent to each other in the first direction, and a second inner wiring section connecting a pair of the second storage stacks adjacent to each other in the first direction, and the case further has a partition wall separating the first inner wiring section and the second inner wiring section.

4. The storage device according to claim 1, wherein the case has a lower case that opens upward and an upper cover that closes the opening of the lower case, the lower case has a bottom wall and a peripheral wall that stands up from the peripheral edge of the bottom wall and surrounds the multiple first storage stacks and the multiple second storage stacks, and the defining portion is composed of a portion of the bottom wall that is on one side of the multiple first storage stacks and the multiple second storage stacks, a portion of the peripheral wall that is on one side of the multiple first storage stacks and the multiple second storage stacks, and a portion of the upper cover that is on one side of the multiple first storage stacks and the multiple second storage stacks.

5. A vehicle comprising: a body frame; and an electric storage device according to any one of claims 1 to 4, the electric storage device being attached to the body frame, wherein the body frame includes a cross frame extending along the width direction of the vehicle, and the first group of adjacent stacks and the second group of adjacent stacks overlap the cross frame in the vertical direction.

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