Power storage device

Abstract

To provide a power storage device that can easily form a configuration that exhausts gas downward from a power storage cell.SOLUTION: A power storage device 10 comprises at least one power storage cell 100, a bottom wall 235 arranged below the at least one power storage cell 100, and a structural member 300 provided on the bottom wall 235. A safety valve SV is provided in a lower face 114a of the power storage cell 100. The at least one power storage cell 100, bottom wall 235, and structural member 300 define a space S below the at least one power storage cell 100.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to an electricity storage device. [Background technology]

[0002] For example, JP 2022-525014 A discloses a power battery pack including a plurality of cells and a housing device. An external terminal and an explosion-proof valve are provided on the side of the case of each cell. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2022-525014 Summary of the Invention [Problem to be solved by the invention]

[0004] In the power battery pack described in JP-A-2022-525014, there are cases where it is desired to discharge gas downward from the unit cells.

[0005] An object of the present disclosure is to provide an electricity storage device that can easily form a configuration for discharging gas downward from an electricity storage cell. [Means for solving the problem]

[0006] A storage device according to one aspect of the present disclosure includes at least one storage cell, a bottom wall disposed below the at least one storage cell, and a structural member provided on the bottom wall, wherein a safety valve is provided on a lower surface of the at least one storage cell, and the at least one storage cell, the bottom wall, and the structural member define a space below the at least one storage cell. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to provide an electricity storage device that can easily form a configuration for discharging gas downward from an electricity storage cell. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a diagram schematically illustrating a vehicle including a power storage device according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a perspective view schematically showing the power storage device, a frame member, a front component member, and a rear component member. [Figure 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. [Figure 5] FIG. 10 is a cross-sectional view showing a modified example of a structural member. [Figure 6] FIG. 10 is a cross-sectional view showing a modified example of a structural member. [Figure 7] FIG. 10 is a cross-sectional view showing a modified example of a structural member. DETAILED DESCRIPTION OF THE INVENTION

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] 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 diagram schematically illustrating a vehicle including a power storage device according to an embodiment of the present disclosure. Fig. 2 is a perspective view schematically illustrating the power storage device, a frame member, and a vehicle frame. Fig. 3 is a cross-sectional view taken along line III-III in Fig. 2. Fig. 4 is a cross-sectional view taken along line IV-IV in Fig. 3.

[0011] 1, a vehicle 1 includes a vehicle body 2 and a power storage device 10. Examples of the vehicle 1 include a hybrid electric vehicle, a plug-in hybrid electric vehicle, and an electric vehicle (battery electric vehicle).

[0012] 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 disposed 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 a direction parallel to the longitudinal direction of the vehicle 1. In the example shown in FIG. 2, the first frame 21 disposed at the front has a shape extending along a second direction perpendicular to both the first direction and the up-down direction. The first frame 21 disposed at the rear has a shape extending in the second direction and convex rearward. The second direction may be a direction 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 extending along the first direction. An end of each second frame 22 in the first direction is connected to the first frame 21. The pair of second frames 22, together with the pair of first frames 21, are formed in a substantially rectangular tubular shape that surrounds the power storage device 10.

[0015] The cross frame 23 is disposed between the pair of first frames 21 and connects the pair of second frames 22. The cross frame 23 forms, for example, a seat cross.

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

[0017] The energy storage device 10 is attached to a frame member 20. As shown in Figs. 2 and 3, the energy storage device 10 is disposed below a cross frame 23. As shown in Figs. 1 to 4, the energy storage device 10 includes four energy storage stacks 11 to 14, a housing 200, a structural member 300, a reinforcing portion 400, a cooler 500, a covering member 600, and an equipment unit 800. The number of energy storage stacks is not limited to four. In Fig. 2, the covering member 600 and the equipment unit 800 are not shown.

[0018] Each of the power storage stacks 11 to 14 includes at least one power storage cell 100. In this 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 side by side along the first direction. Each of the power storage stacks 11 to 14 may further include a plurality of spacers. Each spacer is arranged between a pair of adjacent power storage cells 100 in the power storage cell group. Each of the power storage stacks 11 to 14 is formed in the shape of a rectangular parallelepiped that is long in the first direction. As shown in FIG. 2, the four power storage stacks 11 to 14 are arranged side by side along the second direction.

[0019] 3, a pair of end plates 51 are provided on both sides of the plurality of storage cells 100 in the first direction to sandwich the plurality of storage cells 100 from both sides in the first direction. A monitoring unit (Smart Battery Management) 52 is arranged on the outside of each end plate 51 in the first direction.

[0020] As shown in Fig. 4, each storage cell 100 has a cell body 110 and a pair of external terminals 120. Note that Fig. 4 shows the storage cells 100 included in the first storage cell group 11A of the first storage stack 11 and some of the storage cells 100 included in the second storage cell group 12A of the second storage stack 12.

[0021] The cell body 110 has an electrode assembly 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 perpendicular to both the thickness direction and the up-down direction) corresponds to the second direction.

[0022] The electrode assembly 112 may be formed as a wound body in which a positive electrode sheet and a negative electrode sheet are wound with a separator interposed therebetween, or may be formed as a laminate in which a positive electrode sheet and a negative electrode sheet are stacked with a separator interposed therebetween. The electrode assembly 112 is formed in a shape that is long in the second direction.

[0023] The cell case 114 houses the electrode assembly 112. The cell case 114 is formed in a rectangular parallelepiped shape and is made of a metal such as aluminum.

[0024] As shown in FIG. 4, a safety valve SV is provided on the lower surface 114a of the cell case 114.

[0025] Each external terminal 120 protrudes in the second direction from the side surface 114b of the cell casing 114 in the second direction. One of the pair of external terminals 120 protrudes from the side surface 114b of the cell casing 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 casing 114 on the other side in the second direction.

[0026] The housing 200 houses at least one energy storage cell 100. In this embodiment, the housing 200 houses four energy storage stacks 11 to 14. As shown in FIG. 4 , the housing 200 has a lower case 210, an upper cover 220, and a panel member 230.

[0027] The lower case 210 is open upward and has a bottom surface 212 and a peripheral wall 215.

[0028] The bottom surface 212 is located below each of the power storage stacks 11 to 14. The bottom surface 212 may be formed in a flat plate shape.

[0029] Peripheral wall 215 stands upright from the peripheral edge of bottom surface 212. Peripheral wall 215 has a shape that surrounds the lower portions of each of power storage stacks 11-14 collectively.

[0030] The upper cover 220 is disposed above at least one energy storage cell 100. In this embodiment, the upper cover 220 is disposed above the four energy storage stacks 11 to 14. The upper cover 220, together with the lower case 210, accommodates the four energy storage stacks 11 to 14 in a sealed state. The periphery of the upper cover 220 is connected to the periphery of the lower case 210 by bolts or the like via a sealing member.

[0031] 4, the upper cover 220 has an upper wall 225. The upper wall 225 is provided above at least one energy storage cell 100. In this embodiment, the upper wall 225 is provided above the four energy storage stacks 11 to 14. The upper wall 225 has a top portion 225a and four recesses 225b.

[0032] The top portion 225a is formed flat and overlaps the ends of the power storage stacks in the second direction in the vertical direction.

[0033] Each recess 225b is recessed downward from the top portion 225a. Each recess 225b is formed flat. Each recess 225b is formed above the center of each energy storage stack 11 to 14 in the second direction. As shown in FIG. 4, the length of each recess 225b in the second direction is shorter than the length of the energy storage cell 100 in the second direction. Each recess 225b is in contact with the upper surface of the cell casing 114 via a thermally conductive adhesive 910.

[0034] The panel member 230 is provided below the lower case 210. The panel member 230 has the function of protecting the lower case 210. The panel member 230 may be formed in a flat plate shape. As shown in FIG. 4, the peripheral edge of the panel member 230 is connected to the lower case 210 via a bracket 80. In this embodiment, the bottom surface 212 of the lower case 210 and the panel member 230 form a "bottom wall 235."

[0035] The structural member 300 is provided on the bottom wall 235. The at least one energy storage cell 100, the bottom wall 235, and the structural member 300 define a space S below the at least one energy storage cell 100. In other words, the structural member 300, together with the at least one energy storage cell 100 and the bottom wall 235, defines the space S below the at least one energy storage cell 100. In this embodiment, the structural member 300, together with each of the energy storage stacks 11 to 14 and the bottom wall 235, defines the space S below the energy storage stacks 11 to 14. That is, in this embodiment, four spaces S are formed inside the housing 200.

[0036] As shown in Fig. 3, each space S extends in a first direction. Each space S functions as a smoke exhaust path (hereinafter referred to as a "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 casing 200. Each smoke exhaust path S is connected to a common space within the casing 200 at an end of the smoke exhaust path S in the first direction.

[0037] As shown in FIG. 3, an explosion-proof valve 290 is provided in a portion of the peripheral wall 215 that faces the smoke exhaust path S in the first direction. The explosion-proof valve 290 is provided in the common space within the housing 200. The explosion-proof valve 290 releases pressure within the housing 200. The explosion-proof valve 290 opens when the pressure within the housing 200 reaches or exceeds a reference value. The explosion-proof valve 290 is configured as a check valve. As shown in FIG. 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 to the outside of the housing 200 through the explosion-proof valve 290.

[0038] 4, the structural member 300 is in contact with the lower surfaces 114a of both side portions of at least one energy storage cell 100 in the second direction and with the bottom wall 235. The structural member 300 may support each of the energy storage stacks 11 to 14. In this embodiment, the structural member 300 has a pair of base portions 310, a pair of lower surface contact portions 320, a pair of inner seal portions 330, and a pair of outer seal portions 340.

[0039] The pair of base portions 310 are connected to the bottom wall 235. In this embodiment, each base portion 310 is connected to the bottom surface 212 of the lower case 210. The pair of base portions 310 are arranged at positions facing each other in the second direction (width direction) with the safety valve SV interposed therebetween. As shown in FIG. 4 , each base portion 310 has a connecting portion 311 and a raised portion 312.

[0040] The connection portion 311 is connected to the bottom surface 212 of the lower case 210. The connection portion 311 is formed flat.

[0041] The raised portion 312 is raised from the connecting portion 311. The raised portion 312 is spaced apart from the bottom surface 212 of the lower case 210. The raised portion 312 is formed flat.

[0042] The pair of lower surface contact portions 320 are arranged so as to contact the lower surfaces 114a of the ends of the energy storage cells 100 in the second direction (width direction). The pair of lower surface contact portions 320 are arranged at positions facing each other in the second direction with the safety valve SV in between. Each lower surface contact portion 320 extends in the first direction. The pair of lower surface contact portions 320 may have a function of restraining each of the energy storage stacks 11 to 14. The portions of the lower surfaces 114a of each energy storage cell 100 other than the portions in contact with the lower surface contact portions 320 are in contact with the smoke exhaust path S.

[0043] The pair of inner seal portions 330 are arranged at positions facing each other in the second direction with the safety valve SV in between. Each inner seal portion 330 is in contact with the lower surface 114a of the energy storage cell 100 and the raised portion 312 of the base portion 310. Each inner seal portion 330 may be made of urethane resin.

[0044] The pair of outer seal portions 340 are disposed on the outer sides of the pair of inner seal portions 330 in the second direction. Each outer seal portion 340 is in contact with the lower surface 114a of the energy storage cell 100 and the raised portion 312 of the base portion 310. Each outer seal portion 340 has an upper seal portion 341 and a lower seal portion 342.

[0045] The upper seal portion 341 is provided between the lower surface 114a of each energy storage cell 100 and the lower surface contact portion 320. The lower seal portion 342 is provided between the lower surface contact portion 320 and the base portion 310.

[0046] The reinforcing portion 400 reinforces the bottom wall 235. The reinforcing portion 400 is disposed between a pair of power storage stacks (a pair of power storage cell groups) adjacent to each other in the second direction. Specifically, as shown in Fig. 4, the reinforcing portion 400 is disposed between a pair of cell bodies 110 adjacent to each other in the second direction and below a pair of external terminals 120 adjacent to each other in the second direction. The reinforcing portion 400 overlaps in the up-down direction with both of the pair of external terminals 120 facing each other in the second direction.

[0047] The reinforcing portion 400 extends along the first direction. An end of the reinforcing portion 400 in the first direction may be in contact with the peripheral wall 215 or may be spaced apart from the peripheral wall 215. The reinforcing portion 400 is connected to the base portion 310. In the present embodiment, the reinforcing portion 400 is connected to the protruding portion 312 of the base portion 310 by welding or the like. That is, the reinforcing portion 400 functions as a connecting portion that connects a structural member 300 provided below one of a pair of adjacent power storage stacks (e.g., the first power storage stack 11 and the second power storage stack 12) to a structural member 300 provided below the other of the pair of power storage stacks. The reinforcing portion 400 has a shape that protrudes upward from the protruding portion 312. As shown in FIG. 4 , an end of the reinforcing portion 400 in the second direction is sandwiched between the base portion 310 and the lower seal portion 342. The sum of the thickness of the upper seal portion 341 , the thickness of the lower contact portion 320 , the thickness of the lower seal portion 342 and the thickness of the end portion of the reinforcing portion 400 is equal to the thickness of the inner seal portion 330 .

[0048] 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 FIGS. 2 to 4, the cooler 500 is provided on the upper wall 225. More specifically, the cooler 500 is provided in the recess 225b of the upper wall 225.

[0049] The cooler 500 is in thermal contact with at least one energy storage cell 100 via the upper wall 225. In this embodiment, a thermally conductive adhesive 910 extending along the first direction is provided between the cooler 500 and the recess 225b. That is, in this embodiment, the cooler 500 is in thermal contact with each of the energy storage stacks 11 to 14 via the upper wall 225 and the thermally conductive adhesive 910. Note that being in thermal contact includes a case in which the cooler 500 is in contact with the energy storage cell 100 only via the upper wall 225, and a case in which the cooler 500 is in indirect contact with the energy storage cell 100 via a thermally conductive member (such as an adhesive or a fixing member).

[0050] The covering member 600 covers the cooler 500. The covering member 600 may be made of a material having heat insulating properties. Note that the covering member 600 is not shown in Figures 2 and 3.

[0051] The cooler 500 and the covering member 600 form at least a part of the floor 30 of the vehicle compartment (see FIG. 3). In addition to the cooler 500 and the covering member 600, the floor 30 of the vehicle compartment may include floor constituent members (such as a buffer member or carpet) placed on the covering member 600. Note that the floor constituent members are not shown in FIGS. 2 and 4.

[0052] The equipment unit 800 is disposed, for example, at an end in the first direction. In this embodiment, the equipment unit 800 is disposed on the rear part of the upper cover 220 in the front-rear direction of the vehicle 1. The equipment unit 800 has a junction box 812, an electricity supply unit 814, an electronic control unit 816, a unit cooler 824, and an equipment cover 830.

[0053] The junction box 812 is disposed above the upper cover 220. The junction box 812 houses a relay, a fuse, and the like.

[0054] 3, the cooler 500 has an interposed portion 518 interposed between the upper wall 225 and the junction box 812. The junction box 812 is cooled by the interposed portion 518.

[0055] The power supply unit 814 is disposed above the junction box 812. The power supply unit 814 is cooled by a unit cooler 824 disposed above the power supply unit 814.

[0056] The electronic control unit 816 is disposed above the junction box 812 .

[0057] The equipment cover 830 houses the junction box 812 , the power supply unit 814 , the electronic control unit 816 , and the unit cooler 824 .

[0058] In the energy storage device 10 described above, when 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 smoke exhaust path S. The gas that flows into the smoke exhaust path S then spreads in a first direction and is discharged from the housing 200 through the explosion-proof valve 290 as shown in FIG. 3. This prevents the contents of the energy storage cells 100 (so-called debris) contained in the gas from adhering to the external terminals 120 of the energy storage cells 100, etc.

[0059] Furthermore, in this energy storage device 10, the energy storage cells 100, the bottom wall 235, and the structural members 300 ensure the space S below the energy storage cells 100, so that a configuration for discharging gas downward from the energy storage cells 100 can be easily formed.

[0060] Modifications of the above embodiment will now be described.

[0061] <First Modification> 5, the protruding portion 312 of the base portion 310 may be in contact with the lower surface contact portion 320. In this example, the contact portion between the protruding portion 312 and the lower surface contact portion 320 constitutes the inner seal portion 330.

[0062] The outer seal portion 340 is provided outside the contact portion (inner seal portion 330) between the protruding portion 312 and the lower surface contact portion 320 in the second direction. The outer seal portion 340 is in contact with the lower surface of the lower surface contact portion 320 and the upper surface of the connecting portion 311.

[0063] In this example, the reinforcing portion 400 is connected to the connecting portion 311. That is, the base portion 310 and the reinforcing portion 400 are integrally formed from the same material.

[0064] <Second Modification> 6, the protruding portion 312 of the base portion 310 may be formed in a cantilever shape. The other structures are the same as those of the first modified example.

[0065] <Third Modification> 7, the base portion 310 may have a connecting portion 311 and a folded portion 313 folded back above the connecting portion 311. The folded portion 313 has an opening 313h for welding the connecting portion 311 to the bottom surface 212 of the lower case 210. The folded portion 313 is in contact with the lower surface contact portion 320. This contact portion constitutes an inner seal portion. In this example, the structural member 300 does not have an outer seal portion 340.

[0066] <Fourth Modification> The multiple energy storage cells 100 included in each of the energy storage stacks 11 to 14 may be arranged side by side along the second direction. In this case, each smoke exhaust path S extends along the second direction and is connected to a common space at an end in the second direction. In this example, the explosion-proof valve 290 may be provided in a portion of the peripheral wall 215 that faces the smoke exhaust path S in the second direction. Alternatively, the common space formed at the end in the second direction may extend toward the end in the first direction, and the explosion-proof valve 290 may be provided in the same position as in the above embodiment.

[0067] It will be appreciated by those skilled in the art that the exemplary embodiments described above are examples of the following aspects.

[0068] [Aspect 1] at least one storage cell; a bottom wall disposed below the at least one storage cell; a structural member provided on the bottom wall, a safety valve is provided on a lower surface of the at least one storage cell; The at least one storage cell, the bottom wall, and the structural member define a space below the at least one storage cell.

[0069] In this electricity storage device, the electricity storage cells, the bottom wall, and the structural members make it possible to easily ensure space below the electricity storage cells.

[0070] [Aspect 2] The energy storage device according to aspect 1, wherein the structural members are in contact with lower surfaces of both side portions of the at least one energy storage cell in a width direction perpendicular to both a thickness direction and a vertical direction of the at least one energy storage cell.

[0071] [Aspect 3] The structural member is a pair of inner seal members arranged in positions facing each other with the safety valve interposed therebetween in the width direction; a pair of outer seal portions disposed on the outer sides of the pair of inner seal members in the width direction, respectively.

[0072] In this embodiment, a double seal structure is formed by the inner seal member and the outer seal member, thereby suppressing gas leakage from the space.

[0073] [Aspect 4] the structural member further includes a pair of base portions connected to the bottom wall and disposed at positions facing each other with the safety valve interposed therebetween in the width direction, The energy storage device according to aspect 3, wherein each of the pair of inner seal portions and each of the pair of outer seal portions are in contact with the lower surface of the at least one energy storage cell and each of the pair of base portions.

[0074] In this embodiment, the base portion makes it easy to adjust the height position of the storage cell.

[0075] [Aspect 5] The structural member is a pair of lower surface contact portions that are arranged at positions facing each other with the safety valve interposed therebetween in the width direction and that are arranged to contact the lower surface of an end portion of the at least one energy storage cell in the width direction; a pair of base portions connected to the bottom wall and disposed at positions facing each other with the safety valve interposed therebetween in the width direction; a pair of outer seal members that seal between each of the pair of lower surface contact portions and each of the pair of base portions, each of the base portions and each of the lower surface contact portions includes a contact portion that contacts with each other; 3. The power storage device according to aspect 2, wherein each of the outer seal portions is disposed outside the contact portion in the width direction.

[0076] In this embodiment, a double seal structure is formed by the inner seal structure formed by the contact portion between the base portion and the lower surface contact portion, and the outer seal structure formed by the outer seal member, thereby suppressing gas leakage from the space.

[0077] [Aspect 6] Further provided is a reinforcing portion that reinforces the bottom wall, The at least one storage cell is a first storage cell group including a plurality of storage cells arranged to be aligned along a first direction parallel to the thickness direction; a second storage cell group that faces the first storage cell group in a second direction parallel to the width direction and includes a plurality of storage cells that are arranged side by side along the first direction, 6. The energy storage device according to any one of aspects 2 to 5, wherein the reinforcing portion is disposed between the first energy storage cell group and the second energy storage cell group and extends along the first direction.

[0078] [Aspect 7] Each of the storage cells is A cell body; an external terminal protruding from the cell body in the second direction; 7. The energy storage device according to claim 6, wherein the reinforcing portion is disposed between a pair of the cell bodies adjacent to each other in the second direction and below a pair of the external terminals adjacent to each other in the second direction.

[0079] [Aspect 8] an upper wall provided above the at least one energy storage cell; Aspect 8. The power storage device of any one of aspects 1 to 7, further comprising: a cooler provided on the upper wall and configured to cool the at least one power storage cell.

[0080] [Aspect 9] a connector connected to the structural member; The at least one storage cell is a first storage cell group including a plurality of storage cells arranged to be aligned along a first direction parallel to the thickness direction; a second storage cell group that faces the first storage cell group in a second direction parallel to the width direction and includes a plurality of storage cells that are arranged side by side along the first direction, The energy storage device of any one of aspects 2 to 8, wherein the connecting portion is disposed between the first energy storage cell group and the second energy storage cell group, and connects the structural member provided below the first energy storage cell group and the structural member provided below the second energy storage cell group to each other.

[0081] 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 rather than the description of the above embodiments, and further includes all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0082] 1 vehicle, 2 vehicle body, 10 energy storage device, 11 to 14 energy storage stack, 11A first energy storage cell group, 12A second energy storage cell group, 20 frame member, 21 first frame, 22 second frame, 23 cross frame, 31 front component, 32 rear component, 51 end plate, 52 monitoring unit, 100 energy storage cell, 110 cell body, 112 electrode body, 114 cell case, 114a lower surface, 120 external terminal, 200 housing, 210 lower case, 212 bottom surface, 215 peripheral wall, 220 upper cover, 225 upper wall, 225a top portion, 225b recess, 230 panel member, 235 bottom wall, 290 explosion-proof valve, 300 structural member, 310 base portion, 311 connection portion, 312 Raised portion, 313 folded portion, 320 lower surface contact portion, 330 inner seal portion, 340 outer seal portion, 341 upper seal portion, 342 lower seal portion, 400 reinforcement portion (connection portion), 500 cooler, 600 covering member, 800 equipment unit, 812 junction box, 814 power supply unit, 816 electronic control unit, 824 unit cooler, 830 equipment cover, 910 thermally conductive adhesive, S space (smoke exhaust path), SV safety valve.

Claims

1. at least one storage cell; a bottom wall disposed below the at least one storage cell; a structural member provided on the bottom wall, a safety valve is provided on a lower surface of the at least one storage cell; The at least one storage cell, the bottom wall, and the structural member define a space below the at least one storage cell.

2. The energy storage device according to claim 1 , wherein the structural members are in contact with lower surfaces of both side portions of the at least one energy storage cell in a width direction perpendicular to both a thickness direction and a vertical direction of the at least one energy storage cell.

3. The structural member is a pair of inner seal portions arranged at positions facing each other with the safety valve interposed therebetween in the width direction; The power storage device according to claim 2 , further comprising: a pair of outer seal portions arranged respectively outside the pair of inner seal portions in the width direction.

4. the structural member further includes a pair of base portions connected to the bottom wall and disposed at positions facing each other with the safety valve interposed therebetween in the width direction, The energy storage device according to claim 3 , wherein each of the pair of inner seal portions and each of the pair of outer seal portions are in contact with the lower surface of the at least one energy storage cell and each of the pair of base portions.

5. The structural member is a pair of lower surface contact portions that are arranged at positions facing each other with the safety valve interposed therebetween in the width direction and that are arranged to contact the lower surface of an end portion of the at least one energy storage cell in the width direction; a pair of base portions connected to the bottom wall and disposed at positions facing each other with the safety valve interposed therebetween in the width direction; a pair of outer seal portions that seal between each of the pair of lower surface contact portions and each of the pair of base portions, each of the base portions and each of the lower surface contact portions includes a contact portion that contacts with each other; The power storage device according to claim 2 , wherein each of the outer seal portions is disposed outside the contact portion in the width direction.

6. Further provided is a reinforcing portion that reinforces the bottom wall, The at least one storage cell is a first storage cell group including a plurality of storage cells arranged to be aligned along a first direction parallel to the thickness direction; a second storage cell group including a plurality of storage cells that face the first storage cell group in a second direction parallel to the width direction and are arranged side by side along the first direction, The power storage device according to claim 2 , wherein the reinforcing portion is disposed between the first power storage cell group and the second power storage cell group and extends along the first direction.

7. Each of the storage cells is A cell body; an external terminal protruding from the cell body in the second direction; The power storage device according to claim 6 , wherein the reinforcing portion is disposed between a pair of the cell bodies adjacent to each other in the second direction and below a pair of the external terminals adjacent to each other in the second direction.

8. an upper wall provided above the at least one storage cell; The power storage device according to claim 1 , further comprising: a cooler provided on the upper wall and configured to cool the at least one power storage cell.

9. a connector connected to the structural member; The at least one storage cell is a first storage cell group including a plurality of storage cells arranged to be aligned along a first direction parallel to the thickness direction; a second storage cell group including a plurality of storage cells that face the first storage cell group in a second direction parallel to the width direction and are arranged side by side along the first direction, 3. The energy storage device according to claim 2, wherein the connecting portion is disposed between the first energy storage cell group and the second energy storage cell group, and connects the structural member provided below the first energy storage cell group and the structural member provided below the second energy storage cell group to each other.

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