Energy storage device

Abstract

To provide a power storage device that can suppress damage to external terminals. [Solution] The energy storage device 10 comprises energy storage stacks 11, 12 including a plurality of energy storage cells 100 arranged in a first direction, and a side wall 212 positioned to the side of the plurality of energy storage cells in a second direction. Each energy storage cell includes a cell case 114 and an external terminal 120. The side wall 212 includes a facing portion 213 facing the side surface 114b of the cell case in a second direction, and a recess 214 formed at a position facing the external terminal in a second direction, having a shape that recesses from the facing portion in a direction away from the external terminal. The length of the recess 214 in the vertical direction is greater than the length of the external terminal 120 in the vertical direction.

Description

Technical Field

[0001] This disclosure relates to a power storage device.

Background Art

[0002] For example, Japanese Patent Publication No. 2022-525014 discloses a power battery pack including a plurality of single cells and a housing device. An external terminal and an explosion-proof valve are provided on the side surface of the case of each single cell.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the power battery pack described in Japanese Patent Publication No. 2022-525014, there is a concern that the external terminal of the single cell may be damaged when an external force acts on the power battery pack from the side.

[0005] An object of this disclosure is to provide a power storage device capable of suppressing damage to the external terminal.

Means for Solving the Problems

[0006] A power storage device according to one aspect of the present disclosure comprises a power storage stack including a plurality of power storage cells arranged in a first direction, and a side wall positioned laterally to the plurality of power storage cells in a second direction perpendicular to both the first direction and the vertical direction, wherein each of the plurality of power storage cells includes a cell case and an external terminal protruding in the second direction from the side surface of the cell case in the second direction, and the side wall includes a facing portion facing the side surface of the cell case in the second direction, and a recess formed at a position facing the external terminal in the second direction and having a shape that recesses from the facing portion in a direction away from the external terminal, wherein the length of the recess in the vertical direction is greater than the length of the external terminal in the vertical direction. [Effects of the Invention]

[0007] According to this disclosure, it is possible to provide an energy storage device that can suppress damage to external terminals. [Brief explanation of the drawing]

[0008] [Figure 1] This figure schematically shows a vehicle equipped with an energy storage device according to one embodiment of the present disclosure. [Figure 2] This is a schematic perspective view showing the energy storage device and frame members. [Figure 3] This is a cross-sectional view taken along line III-III in Figure 2. [Figure 4] Figure 3 shows a cross-sectional view along line IV-IV. [Figure 5] This is a cross-sectional view showing the vicinity of the external terminals. [Figure 6] This is a schematic cross-sectional view showing a modified side wall. [Figure 7] This is a schematic cross-sectional view showing a modified example of an energy storage device. [Modes for carrying out the invention]

[0009] Embodiments of this disclosure will be described with reference to the drawings. In the drawings referred to below, the same or equivalent components are given the same number.

[0010] Figure 1 is a schematic diagram showing a vehicle equipped with an energy storage device according to one embodiment of the present disclosure. Figure 2 is a schematic perspective view showing the energy storage device and frame members. Figure 3 is a cross-sectional view taken along line III-III in Figure 2. Figure 4 is a cross-sectional view taken along line IV-IV in Figure 3. Figure 5 is an exploded cross-sectional view of the energy storage device. Figure 6 is an enlarged cross-sectional view of the energy storage device.

[0011] As shown in Figure 1, vehicle 1 comprises a vehicle body 2 and an energy storage device 10. Examples of vehicle 1 include a hybrid electric vehicle, a plug-in hybrid electric vehicle, and a battery electric vehicle.

[0012] As shown in Figures 1 and 2, the vehicle body 2 includes a frame member 20, a front component member 31, and a rear component member 32. The frame member 20 is located at the bottom of the vehicle body 2. The frame member 20 has a pair of first frames 21, a pair of second frames 22, and a cross frame 23.

[0013] The pair of first frames 21 face each other in a first direction. The first direction may be parallel to the longitudinal direction of the vehicle 1. In the example shown in Figure 2, the first frame 21 positioned at the front has a shape that extends along a second direction perpendicular to both the first direction and the vertical direction. The first frame 21 positioned at the rear has a shape that extends in the second direction and is convex towards the rear. The second direction may be parallel to the left-right direction (width direction) of the vehicle 1.

[0014] The pair of second frames 22 face each other in the second direction. Each second frame 22 has a shape that extends along the first direction. The ends of each second frame 22 in the first direction are connected to the first frame 21. The pair of second frames 22, together with the pair of first frames 21, are formed into a roughly rectangular tubular shape that encloses the energy storage device 10.

[0015] The cross frame 23 is disposed between a pair of first frames 21 and connects the pair of second frames 22 to each other. The cross frame 23 constitutes, for example, a sheet cross.

[0016] The front component member 31 is connected to the front portion of the frame member 20. The rear component member 32 is connected to the rear portion of the frame member 20. Each of the component members 31, 32 may be formed by aluminum die casting.

[0017] The power storage device 10 is attached to the frame member 20. As shown in FIGS. 2 to 5, the power storage device 10 is disposed below the cross frame 23. As shown in FIGS. 1 to 5, the power storage device 10 includes four power storage stacks 11 to 14, a housing 200 (see FIGS. 2 and 3), a support member 300, a cooler 500, and a device unit 800. Note that the number of power storage stacks is not limited to four. In FIG. 2, the illustration of the device unit 800 is omitted.

[0018] Each of the power storage stacks 11 to 14 includes at least one power storage cell 100. In the present embodiment, each of the power storage stacks 11 to 14 includes a power storage cell group including a plurality of (for example, 50) power storage cells 100 arranged along the first direction. Each of the power storage stacks 11 to 14 may further include a plurality of spacers. Each spacer is disposed between a pair of power storage cells 100 adjacent to each other in the power storage cell group. Each of the power storage stacks 11 to 14 is formed in a rectangular parallelepiped shape long in the first direction. As shown in FIG. 2, the four power storage stacks 11 to 14 are arranged along the second direction.

[0019] As shown in FIG. 3, on both sides of the plurality of power storage cells 100 in the first direction, a pair of end plates 51 that sandwich the plurality of power storage cells 100 from both sides in the first direction are provided. Outside each end plate 51 in the first direction, a monitoring unit (Smart Battery Management) 52 is disposed.

[0020] As shown in FIGS. 4 and 5, each power storage cell 100 has a cell body 110 and a pair of external terminals 120.

[0021] The cell body 110 has an electrode body 112 and a cell case 114. The thickness direction of the cell body 110 corresponds to the first direction. The width direction of the cell body 110 (the direction orthogonal to both the thickness direction and the up-and-down direction) corresponds to the second direction.

[0022] The electrode body 112 may be formed of a wound body in which a positive electrode sheet and a negative electrode sheet are wound via a separator, or may be formed of a laminate in which a positive electrode sheet and a negative electrode sheet are laminated via a separator. The electrode body 112 is formed in a shape that is long in the second direction.

[0023] The cell case 114 houses the electrode body 112. The cell case 114 is formed in a rectangular parallelepiped shape. The length of the cell case 114 in the width direction is larger than the length of the cell case 114 in the up-and-down direction and larger than the length of the cell case 114 in the thickness direction. The cell case 114 is made of a metal such as aluminum. As shown in FIGS. 4 and 5, a safety valve SV is provided on the lower surface 114a of the cell case 114.

[0024] Each external terminal 120 protrudes in the second direction from the side surface 114b of the cell case 114 in the second direction. One of the pair of external terminals 120 protrudes from the side surface 114b of the cell case 114 on one side in the second direction. The other of the pair of external terminals 120 protrudes from the side surface 114b of the cell case 114 on the other side in the second direction.

[0025] Each power storage stack 11 to 14 further has an upper restraint band 130a and a lower restraint band 130b.

[0026] The upper restraint band 130a restrains the multiple energy storage cells 100 from both sides in the first direction. The upper restraint band 130a is positioned above the external terminals 120. The upper restraint band 130a is in contact with the side surface 114b of each energy storage cell 100.

[0027] The lower restraint band 130b restrains the multiple energy storage cells 100 from both sides in the first direction. The lower restraint band 130b is located below the external terminal 120. The lower restraint band 130b is in contact with the side surface 114b of each energy storage cell 100.

[0028] The housing 200 houses four energy storage stacks 11 to 14. As shown in Figures 4 and 5, the housing 200 has a frame 210 (see Figure 4), a top wall 220, a bottom wall 230, and a number of partition walls 240 (three in this embodiment).

[0029] The frame 210 encloses the four energy storage stacks 11-14 together. The frame 210 may be formed in a rectangular tubular shape. The frame 210 is formed, for example, from die-cast aluminum. As shown in Figures 3 and 4, the frame 210 has a pair of side walls 212, a pair of connecting walls 216 (see Figure 3), and a fixing portion 218.

[0030] As shown in Figure 4, each side wall 212 is positioned outside the multiple energy storage stacks 11-14 in the second direction. That is, a pair of side walls 212 are positioned to sandwich the four energy storage stacks 11-14 in the second direction. Each side wall 212 extends along the first direction. The length of each side wall 212 in the first direction is longer than the length of each energy storage stack 11-14 in the first direction.

[0031] As shown in Figures 4 and 5, the side wall 212 includes an opposing portion 213 and a recess 214.

[0032] The opposing portion 213 faces the side surface 114b of the cell case 114 in the second direction. As shown in Figure 5, the opposing portion 213 has an upper opposing portion 213a and a lower opposing portion 213b.

[0033] The upper opposing portion 213a faces the portion of the energy storage stacks 11 and 14 located on the outside in the second direction, above each external terminal 120. In this embodiment, the upper opposing portion 213a faces the upper restraint band 130a. Other members may be interposed between the upper opposing portion 213a and the side surface 114b of the cell case 114. The upper opposing portion 213a may be formed flat.

[0034] The lower opposing portion 213b faces the lower part of each external terminal 120 of the energy storage stacks 11 and 14. In this embodiment, the lower opposing portion 213b faces the lower restraint band 130b. Other members may be interposed between the lower opposing portion 213b and the side surface 114b of the cell case 114. The lower opposing portion 213b may be formed flat.

[0035] The recess 214 is formed in a position facing the external terminal 120 in the second direction. The recess 214 has a shape that is recessed from the opposing portion 213 in a direction away from the external terminal 120. As shown in Figure 5, the recess 214 includes an upper surface 214a, a lower surface 214b, and a retracted portion 214c.

[0036] The upper surface 214a of the recess 214 is located above the upper surface 120a of the external terminal 120. The lower surface 214b of the recess 214 is located below the lower surface 120b of the external terminal 120. In other words, as shown in Figure 5, the length H2 of the recess 214 in the vertical direction is greater than the length H1 of the external terminal 120 in the vertical direction.

[0037] The retractable portion 214c faces the external terminal 120 in the second direction. The retractable portion 214c may be formed flat. The dimension W1 between the external terminal 120 and the retractable portion 214c in the second direction is greater than the dimension W2 between the energy storage stacks 11,14 and the upper opposing portion 213a in the second direction, and greater than the dimension W3 between the energy storage stacks 11,14 and the lower opposing portion 213b in the second direction. In this embodiment, dimension W2 means the length between the upper restraint band 130a and the upper opposing portion 213a in the second direction, and dimension W3 means the length between the lower restraint band 130b and the lower opposing portion 213b in the second direction. Note that dimensions W2 and W3 may be set to the same length.

[0038] A pair of connecting walls 216 are provided on both sides of each energy storage stack 11-14 in the first direction (thickness direction). Each connecting wall 216 connects a pair of side walls 212 to each other. In this embodiment, the connecting wall 216 located on one side in the first direction (the front side in the longitudinal direction of the vehicle) connects one end (front end) of each side wall 212 in the first direction. The connecting wall 216 located on the other side in the first direction (the rear side in the longitudinal direction of the vehicle) connects the other end (rear end) of each side wall 212 in the first direction.

[0039] The fixing portion 218 is the part that connects to the frame member 20. The fixing portion 218 has a shape that protrudes outward from the outer surface of each side wall 212 and the outer surface of each connecting wall 216. The fixing portion 218 is fastened from below to each frame 21, 22 with bolts B1.

[0040] The top wall 220 is provided above at least one energy storage cell 100. In this embodiment, the top wall 220 is provided above four energy storage stacks 11-14. The top wall 220 covers the four energy storage stacks 11-14. The top wall 220 is connected to the upper end of the frame 210. Specifically, the top wall 220 is connected to the upper end of each side wall 212 and the upper end of each connecting wall 216 by welding or the like. As shown in Figure 4, the top wall 220 has a top section 222 and four recesses 224.

[0041] The top portion 222 is formed flat. The top portion 222 overlaps the ends of each energy storage stack in the second direction in the vertical direction.

[0042] Each recess 224 is recessed downward from the top 222. Each recess 224 is formed flat. Each recess 224 is formed above the central portion of each energy storage stack 11-14 in the second direction. As shown in Figure 4, the length of each recess 224 in the second direction is shorter than the length of the energy storage cell 100 in the second direction. Each recess 224 is in contact with the upper surface of the cell case 114 via a thermally conductive adhesive 910.

[0043] The bottom wall 230 is located below the four energy storage stacks 11-14. The bottom wall 230 is connected to the lower part of the frame 210. More specifically, the bottom wall 230 is connected to the lower ends of each side wall 212 and each connecting wall 216 by adhesive members 350 (see Figures 4 and 5). The bottom wall 230 may also be fastened to the lower part of the frame 210 by bolts. The bottom wall 230 is preferably formed in a flat plate shape.

[0044] Each partition wall 240 separates a pair of energy storage stacks facing each other in a second direction. Each partition wall 240 is positioned between a pair of external terminals 120 facing each other in a second direction. Each partition wall 240 extends downward from the top wall 220. The upper end of each partition wall 240 is connected to the lower surface of the top portion 222 of the top wall 220 by welding, bonding, fastening, etc. Each partition wall 240 extends in a first direction. The end of each partition wall 240 in the first direction may be connected to the connecting wall 216 of the frame 210, or it may be spaced apart from the connecting wall 216. Each partition wall 240 is connected to the cross frame 23 via the top wall 220. Each partition wall 240 may be formed by extrusion molding of a metal such as aluminum.

[0045] As shown in Figure 4, each partition wall 240 has an upper partition section 241, a lower partition section 242, and an intermediate partition section 243.

[0046] The upper partition 241 is positioned higher than the external terminal 120. The upper partition 241 is connected to the top wall 220. Specifically, the upper surface of the upper partition 241 is connected to the lower surface of the top portion 222 of the top wall 220 by welding, bonding, fastening, etc. The upper partition 241 may be formed in a hollow shape. In this embodiment, the upper partition 241 is formed in a rectangular tubular shape extending in a first direction. The upper partition 241 is positioned between a pair of restraint bands 53 that are adjacent to each other in a second direction.

[0047] The lower partition portion 242 is located lower than the external terminal 120. The lower partition portion 242 may be formed in a hollow shape. In this embodiment, the lower partition portion 242 is formed in a rectangular tubular shape extending in a first direction. The lower partition portion 242 is positioned between a pair of restraint bands 53 that are adjacent to each other in a second direction.

[0048] The intermediate partition 243 connects the upper partition 241 and the lower partition 242. The intermediate partition 243 is provided between a pair of adjacent external terminals 120 in the second direction. The intermediate partition 243 is formed in a flat plate shape. The width of the intermediate partition 243 in the second direction is smaller than the width of the upper partition 241 and the width of the lower partition 242 in the second direction.

[0049] The support member 300 supports the four energy storage stacks 11-14. The support member 300 is fixed on the bottom wall 230. The energy storage device 10 in this embodiment includes five support members 300 that are spaced apart from each other in a second direction. Each support member 300 has a support member body 310 and an adhesive member 320.

[0050] The support member body 310 is positioned so as to overlap vertically with the respective ends of a pair of energy storage cells 100 that are facing each other in the second direction. The support member body 310 has a shape that exposes downwards the portion of the lower surface 114a of the cell case 114 that does not overlap vertically with the support member body 310 (the portion including the safety valve SV). In other words, the portion of the lower surface 114a of the cell case 114 that does not overlap vertically with the support member body 310 is exposed downwards. The support member body 310 extends in the first direction. The support member body 310 may be formed by extrusion molding of a metal such as aluminum.

[0051] Each of the three centrally located support member bodies 310 in the second direction is fastened to the lower end of the partition wall 240 by bolts B2. Each of the pair of support member bodies 310 located outward in the second direction is fastened to the lower part of the side wall 212 by bolts B2. As shown in Figures 4 and 5, notches 212s are formed in the lower part of each side wall 212 to receive the support member bodies 310.

[0052] The adhesive member 320 adheres the end of the support member body 310 in the second direction to the lower surface 114a of the energy storage cell 100.

[0053] As shown in Figure 4, a pair of support members 300 adjacent to each other in the second direction are in contact with the lower surface 114a of the end of the energy storage cell 100 and the bottom wall 230 in the second direction. These pairs of support members 300, together with the energy storage cell 100 and the bottom wall 230, define a space S below each energy storage stack 11-14. In other words, in this embodiment, four spaces S are formed within the housing 200.

[0054] As shown in Figure 3, each space S extends in a first direction. Each space S functions as a smoke exhaust path (hereinafter referred to as "smoke exhaust path S"). The smoke exhaust path S is a path for discharging gas discharged from the safety valve SV of the energy storage cell 100 to the outside of the housing 200. Each smoke exhaust path S connects to a common space within the housing 200 at its end in the first direction.

[0055] As shown in Figure 3, an explosion-proof valve 290 is provided in the portion of the connecting wall 216 facing the smoke exhaust path S in the first direction. The explosion-proof valve 290 is located in the common space within the housing 200. The explosion-proof valve 290 releases pressure inside the housing 200. The explosion-proof valve 290 opens when the pressure inside the housing 200 exceeds a standard value. The explosion-proof valve 290 is composed of a check valve. As shown in Figure 3, when gas is discharged from any of the energy storage cells 100, the gas spreads in the first direction through the smoke exhaust path S and is discharged outside the housing 200 through the explosion-proof valve 290.

[0056] The cooler 500 cools at least one energy storage cell 100. A cooling medium (such as water) flows through the cooler 500. As shown in Figures 2 to 4, the cooler 500 is mounted on the top wall 220. More specifically, the cooler 500 is located in a recess 224 of the top wall 220.

[0057] The cooler 500 is in thermal contact with at least one energy storage cell 100 via the top wall 220. In this embodiment, a thermally conductive adhesive 910 (see Figure 4) extending along the first direction is provided between the cooler 500 and the recess 224. In other words, in this embodiment, the cooler 500 is in thermal contact with each energy storage stack 11-14 via the top wall 220 and the thermally conductive adhesive 910. Note that thermal contact includes embodiments in which the cooler 500 is in contact with the energy storage cell 100 only via the top wall 220, and embodiments in which the cooler 500 is indirectly in contact with the energy storage cell 100 via a thermally conductive member (such as an adhesive or fixing member).

[0058] The cooler 500 forms at least a portion of the passenger compartment floor 30 (see Figure 3). The passenger compartment floor 30 may include floor components (covering members, cushioning members, carpets, etc.) placed on top of the cooler 500, in addition to the cooler 500. Note that the floor components are not shown in Figures 2 and 4.

[0059] The equipment unit 800 is located, for example, at the end in the first direction. In this embodiment, the equipment unit 800 is located on the rear of the roof wall 220 in the longitudinal direction of the vehicle 1. The equipment unit 800 includes a junction box 812, an Electricity Supply Unit 814, an Electronic Control Unit 816, a unit cooler 824, and an equipment cover 830.

[0060] The junction box 812 is located above the top wall 220. The junction box 812 houses relays, fuses, and other components.

[0061] As shown in Figure 3, the cooler 500 has an intervening portion 518 that is interposed between the top wall 220 and the junction box 812. The junction box 812 is cooled by the intervening portion 518.

[0062] The power supply unit 814 is located above the junction box 812. The power supply unit 814 is cooled by a unit cooler 824 located on top of the power supply unit 814.

[0063] The electronic control unit 816 is located above the junction box 812.

[0064] The equipment cover 830 houses the junction box 812, the power supply unit 814, the electronic control unit 816, and the unit cooler 824.

[0065] In the energy storage device 10 described above, if gas is discharged downward from the safety valve SV due to a short circuit or the like in any of the energy storage cells 100, the gas flows into the exhaust gas path S. The gas that flows into the exhaust gas path S then spreads in the first direction and is discharged from the housing 200 through the explosion-proof valve 290 as shown in Figure 3. As a result, the contents of the energy storage cells 100 (so-called debris) contained in the gas are prevented from adhering to the external terminals 120 of the energy storage cells 100.

[0066] Furthermore, in this energy storage device 10, since the side wall 212 includes a recess 214, interference between the side wall 212 and the external terminal 120 and resulting damage to the external terminal 120 are suppressed when an external force acts on the side wall 212 in a second direction. More specifically, when an external force acts on the side wall 212 in a second direction, the upper opposing portion 213a abuts against the upper restraint band 130a and the lower opposing portion 213b abuts against the lower opposing portion 213b before the retracted portion 214c of the recess 214 contacts the external terminal 120. Thus, damage to the external terminal 120 is suppressed.

[0067] Modifications of the above embodiment will be described below.

[0068] <First variation> As shown in Figure 6, the side wall 212 may be formed in a hollow shape. In this case, the side wall 212 is formed, for example, by extrusion molding. By making the thickness of the horizontal portion 212h of the side wall 212 smaller than the thickness of the vertical portion 212v, the side wall 212 functions as an energy absorber when an external force acts on the energy storage device 10 in a second direction.

[0069] In this embodiment, the side walls 212 can be formed relatively easily, and the side walls 212 are made lighter.

[0070] <Second variation> As shown in Figure 7, the energy storage device 10 may include a lower case 201, an upper cover 202, a lower member 203, and an upper member 204.

[0071] The lower case 201 is open upward. The lower case 201 has a bottom wall 230 and a lower peripheral wall 231 that rises from the periphery of the bottom wall 230. The lower peripheral wall 231 surrounds the lower part of the four energy storage stacks 11-14. A panel member 232 protecting the bottom wall 230 may be attached below the lower case 201.

[0072] The upper cover 202, together with the lower case 201, houses four energy storage stacks 11-14. The upper cover 202 has a top wall 220 and an upper peripheral wall 225 extending downward from the periphery of the top wall 220.

[0073] The lower member 203 is connected to the inner surface of the lower case 201 by welding or the like. More specifically, the lower member 203 is connected to the upper surface of the bottom wall 230 and the inner surface of the lower peripheral wall 231. The lower member 203 includes a lower opposing portion 213b and a lower surface 214b of a recess 214. The space formed by the lower member 203 and the lower case 201 is filled with a lower filler material 253 made of a foaming agent or the like.

[0074] The upper member 204 is connected to the inner surface of the upper cover 202 by welding or the like. More specifically, the upper member 204 is connected to the lower surface of the top wall 220 and the inner surface of the upper peripheral wall 225. The upper member 204 includes an upper opposing portion 213a and the upper surface 214a of the recess 214. The space formed by the upper member 204 and the upper cover 202 is filled with an upper filler material 254 made of a foaming agent or the like.

[0075] Those skilled in the art will understand that the exemplary embodiments described above are specific examples of the following embodiments.

[0076] [Aspect 1] A storage stack including multiple storage cells arranged in a first direction, The device comprises side walls positioned to the sides of the plurality of energy storage cells in a second direction perpendicular to both the first direction and the vertical direction, Each of the aforementioned plurality of energy storage cells is Cell case and, Includes an external terminal protruding in the second direction from the side surface of the cell case in the second direction, The aforementioned side wall is In the second direction, the opposing portion facing the side surface of the cell case, It includes a recess formed in the second direction opposite to the external terminal, and having a shape that is recessed from the opposing portion in a direction away from the external terminal, A power storage device in which the length of the recess in the vertical direction is greater than the length of the external terminal in the vertical direction.

[0077] In this energy storage device, the side wall includes a recess, which suppresses interference between the side wall and the external terminals and resulting damage to the external terminals when an external force acts on the side wall in a second direction.

[0078] [Aspect 2] The opposing portion is, The energy storage stack includes an upper facing portion that faces the portion above each of the external terminals, The energy storage stack has a lower opposing portion that faces the portion below each of the external terminals, The recess includes a retracted portion facing the external terminal, The energy storage device according to embodiment 1, wherein the dimension between the external terminal and the retracted portion in the second direction is greater than the dimension between the energy storage stack and the upper opposing portion in the second direction, and greater than the dimension between the energy storage stack and the lower opposing portion in the second direction.

[0079] In this embodiment, when an external force acts on the side wall in the second direction, the upper and lower opposing parts come into contact with parts of the energy storage stack other than the external terminals, thereby suppressing contact of the retracted part with the external terminals.

[0080] [Aspect 3] The aforementioned energy storage stack is An upper restraint band is positioned above the external terminal and restrains the plurality of energy storage cells from both sides in the first direction, It includes a lower restraint band positioned below the external terminals and restraining the plurality of energy storage cells from both sides in the first direction, The energy storage device according to embodiment 2, wherein the dimension between the external terminal and the retracted portion in the second direction is greater than the dimension between the upper restraint band and the upper opposing portion in the second direction, and greater than the dimension between the lower restraint band and the lower opposing portion in the second direction.

[0081] In this embodiment, it is possible to both restrain multiple energy storage cells with an upper restraint band and a lower restraint band, and to suppress damage to the external terminals when an external force acts on the side wall in a second direction.

[0082] [Aspect 4] The lower case including the bottom wall, An upper cover that houses the energy storage stack together with the lower case, A lower member provided on the inner surface of the lower case in the portion facing the energy storage stack in the second direction, The upper cover further comprises an upper member provided on the inner surface of the upper cover in a portion facing the energy storage stack in the second direction, The recess is formed by a part of the lower case, a part of the upper cover, a part of the lower member, and a part of the upper member. The lower member includes the lower opposing portion, The energy storage device according to embodiment 3, wherein the upper member includes the upper opposing portion.

[0083] [Aspect 5] A lower filling material is filled between the lower case and the lower member, The energy storage device according to embodiment 4, further comprising an upper filling material filled between the upper cover and the upper member.

[0084] In this embodiment, when an external force acts on the side wall in a second direction, the collapse of the cross-section of the lower and upper members is suppressed.

[0085] It should be noted that the embodiments disclosed herein are illustrative in all respects and not restrictive. The scope of this disclosure is defined by the claims rather than the description of the embodiments above, and includes all modifications within the meaning and scope equivalent to the claims. [Explanation of symbols]

[0086] 1 Vehicle, 2 Vehicle body, 10 Energy storage device, 11-14 Energy storage stack, 20 Frame member, 21 First frame, 22 Second frame, 23 Cross frame, 30 Floor section, 31 Front component member, 32 Rear component member, 51 End plate, 52 Monitoring unit, 100 Energy storage cell, 110 Cell body, 112 Electrode body, 114 Cell case, 114a Bottom surface, 120 External terminal, 130a Upper restraint band, 130b Lower restraint band, 200 Housing, 201 Lower case, 202 Upper cover, 203 Lower component member, 204 Upper component member, 210 Frame body, 212 Side wall, 212s Notch, 213 Opposing part, 213a Upper opposing part, 213b Lower opposing part, 214 Recess, 214a Top surface, 214b Bottom surface, 214c Recessed section, 216 Connecting wall, 218 Fixing section, 220 Top wall, 222 Top section, 224 Recess, 230 Bottom wall, 240 Partition wall, 253 Lower filling material, 254 Upper filling material, 290 Explosion-proof valve, 300 Support member, 310 Support member body, 320 Adhesive member, 500 Cooler, 800 Equipment unit, 812 Junction box, 814 Power supply unit, 816 Electronic control unit, 824 Unit cooler, 830 Equipment cover, 910 Thermal conductive adhesive, S Space (smoke exhaust path), SV Safety valve.

Claims

1. A storage stack including multiple storage cells arranged in a first direction, The device comprises side walls positioned to the sides of the plurality of energy storage cells in a second direction perpendicular to both the first direction and the vertical direction, Each of the aforementioned plurality of energy storage cells is Cell case and, Includes an external terminal protruding in the second direction from the side surface of the cell case in the second direction, The aforementioned side wall is In the second direction, the opposing portion facing the side surface of the cell case, It includes a recess formed in the second direction opposite to the external terminal, and having a shape that is recessed from the opposing portion in a direction away from the external terminal, A power storage device in which the length of the recess in the vertical direction is greater than the length of the external terminal in the vertical direction.

2. The opposing portion is, The energy storage stack includes an upper facing portion that faces the portion above each of the external terminals, The energy storage stack has a lower opposing portion that faces the portion below each of the external terminals, The recess includes a retracted portion facing the external terminal, The energy storage device according to claim 1, wherein the dimension between the external terminal and the retracted portion in the second direction is greater than the dimension between the energy storage stack and the upper opposing portion in the second direction, and greater than the dimension between the energy storage stack and the lower opposing portion in the second direction.

3. The aforementioned energy storage stack is An upper restraint band is positioned above the external terminal and restrains the plurality of energy storage cells from both sides in the first direction, It includes a lower restraint band positioned below the external terminals and restraining the plurality of energy storage cells from both sides in the first direction, The energy storage device according to claim 2, wherein the dimension between the external terminal and the retracted portion in the second direction is greater than the dimension between the upper restraint band and the upper opposing portion in the second direction, and greater than the dimension between the lower restraint band and the lower opposing portion in the second direction.

4. A lower case including a bottom wall located below the energy storage stack, An upper cover that houses the energy storage stack together with the lower case, A lower member provided on the inner surface of the lower case in the portion facing the energy storage stack in the second direction, The upper cover further comprises an upper member provided on the inner surface of the upper cover in a portion facing the energy storage stack in the second direction, The recess is formed by a part of the lower case, a part of the upper cover, a part of the lower member, and a part of the upper member. The lower member includes the lower opposing portion, The energy storage device according to claim 3, wherein the upper member includes the upper opposing portion.

5. A lower filling material is filled between the lower case and the lower member, The energy storage device according to claim 4, further comprising an upper filling material filled between the upper cover and the upper member.

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