Energy storage device

Abstract

To provide an energy storage device that can prevent waste from an energy storage cell from coming into contact with the safety valve of an adjacent cell. [Solution] The energy storage device 10 comprises a plurality of energy storage cells 100 and an insulating member 150 having a shape that extends from an energy storage cell located at one end in a first direction to an energy storage cell located at the other end in a second direction. Each energy storage cell 100 has a valve mounting surface 114a including a safety valve SV. The insulating member 150 is in contact with the valve mounting surface 114a and includes a plurality of intermediate weak points. Each intermediate weak point is formed at a position facing a pair of adjacent energy storage cells 100 in a first direction and extends in a second direction.

Description

Technical Field

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

Background Art

[0002] For example, Japanese Patent Translation Publication No. 2024-501935 discloses an electrical device including a plurality of battery cells, a first housing that houses the plurality of battery cells, a second housing that houses the first housing, and a separation member provided in the second housing. The separation member supports the first housing at a position above the bottom surface of the second housing. A collection cavity is formed below the separation member in the second housing. A third weak area is provided on the lower surface of the housing of the battery cell, a pressure relief area is provided on the bottom surface of the first housing, and a second weak area is provided on the separation member. The second weak area is made of a material having a lower melting point than the area of the separation member other than the second weak area. The discharge discharged from the battery cell through the third weak area of the battery cell flows into the collection cavity formed below the separation member through the pressure relief area and the second weak area.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the electrical device described in Japanese Patent Translation Publication No. 2024-501935, in order to prevent the discharge discharged from one battery cell from contacting the lower surface of the adjacent battery cell, it is conceivable to provide a heat insulating member that covers the lower surfaces of the plurality of battery cells. However, if this is done, there is a concern that when the discharge is discharged from one battery cell, the discharge will accumulate between the adjacent battery cell and the heat insulating member.

[0005] The purpose of this disclosure is to provide an energy storage device that can prevent waste from an energy storage cell from coming into contact with the safety valve of an adjacent cell. [Means for solving the problem]

[0006] A power storage device according to one aspect of the present disclosure comprises a plurality of power storage cells arranged along a first direction, and a heat insulating member having a shape that extends from a power storage cell located at one end of the plurality of power storage cells in the first direction to a power storage cell located at the other end of the plurality of power storage cells in the first direction, wherein each of the plurality of power storage cells has a valve mounting surface including a safety valve, and the heat insulating member is in contact with the valve mounting surface and includes a plurality of intermediate weak points, each of which is formed at a position facing a pair of adjacent power storage cells in the first direction and extends in a second direction perpendicular to both the first direction and the vertical direction. [Effects of the Invention]

[0007] According to this disclosure, it is possible to provide an energy storage device that can prevent waste from an energy storage cell from coming into contact with the safety valve of an adjacent cell. [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, frame members, front components, and rear components. [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 schematic bottom view showing the energy storage stack and insulation components. [Figure 6] This is a schematic bottom view showing a modified arrangement of the adhesive members. [Figure 7] This is a bottom view schematicly showing a modified example of the opposing weak point. [Figure 8] This is a bottom view schematicly showing a modified example of the opposing weak point. [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, frame members, and vehicle skeleton. 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.

[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] A pair of second frames 22 face each other in the second direction. Each second frame 22 has a shape extending 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 are formed in a substantially rectangular prism shape surrounding the power storage device 10 together with the pair of first frames 21.

[0015] The cross frame 23 is disposed between the 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 31 is connected to the front part of the frame member 20. The rear component 32 is connected to the rear part of the frame member 20. Each of the components 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 and 3, the power storage device 10 is disposed below the cross frame 23. As shown in FIGS. 1 to 4, the power storage device 10 includes four power storage stacks 11 to 14, a heat insulating member 150, an adhesive member 180, a housing 200, a structural member 300, a reinforcing part 400, a cooler 500, and a covering member 600. Note that the number of power storage stacks is not limited to four. In FIG. 2, the illustration of the covering member 600 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 group of power storage cells including a plurality (for example, 50) of 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 disposed between a pair of power storage cells 100 adjacent to each other in the group of power storage cells. Each of the power storage stacks 11 to 14 is formed in a rectangular parallelepiped shape 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] As shown in FIG. 3, on both sides of a 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 arranged.

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

[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-down direction) corresponds to the second direction.

[0022] The electrode body 112 may be composed of a wound body in which a positive electrode sheet and a negative electrode sheet are wound via a separator, or may be composed of a laminated body 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 cell case 114 is made of a metal such as aluminum. The cell case 114 includes a valve installation surface 114a and a terminal installation surface 114b.

[0024] A safety valve SV is provided on the valve installation surface 114a. In the present embodiment, the valve installation surface 114a is constituted by the lower surface of the cell case 114. However, the valve installation surface 114a may be constituted by the upper surface of the cell case 114 or the side surface of the cell case 114 in the second direction.

[0025] External terminals 120 are provided on the terminal mounting surface 114b. In this embodiment, the terminal mounting surface 114b is formed by the side surface of the cell case 114 in the second direction. That is, each external terminal 120 protrudes in the second direction from the side surface of the cell case 114 in the second direction. One of a pair of external terminals 120 protrudes from the side surface of the cell case 114 on one side in the second direction. The other of a pair of external terminals 120 protrudes from the side surface of the cell case 114 on the other side in the second direction.

[0026] The heat insulating member 150 has a shape that extends from the energy storage cells 100 located at one end in the first direction among the multiple energy storage cells 100 included in each energy storage stack 11 to 14 to the energy storage cells 100 located at the other end in the first direction among the multiple energy storage cells 100. The heat insulating member 150 may be formed in the shape of a flat plate. The heat insulating member 150 is made of, for example, mica, which is made by solidifying natural inorganic minerals by heat pressing.

[0027] The heat insulating member 150 is in contact with the valve mounting surface 114a of each energy storage cell 100. As shown in Figure 4, the heat insulating member 150 is connected to the valve mounting surface 114a by an adhesive member 180.

[0028] As shown in Figure 5, the thermal insulation member 150 includes a plurality of intermediate weak portions 152 and a plurality of opposing weak portions 154. Each intermediate weak portion 152 and each opposing weak portion 154 has lower rigidity or strength than the other parts of the thermal insulation member 150. For example, the thickness of each weak portion 152, 154 is smaller than the thickness of the other parts of the thermal insulation member 150. In this embodiment, slits are formed in each weak portion 152, 154.

[0029] Each intermediate weak point 152 is formed in a position facing a pair of adjacent energy storage cells 100 in the first direction. Each intermediate weak point 152 extends in a second direction. Preferably, each intermediate weak point 152 extends from one end to the other end of the heat insulating member 150 in the second direction. When gas is discharged from the safety valve SV of one energy storage cell 100, the pair of intermediate weak points 152, which are positioned on either side of the portion of the heat insulating member 150 facing one energy storage cell 100, rupture due to the gas pressure.

[0030] Each opposing weak point 154 is formed in a position opposite the safety valve SV. Each opposing weak point 154 ruptures due to the pressure of the gas discharged from the safety valve SV of each energy storage cell 100. As shown in Figure 5, each opposing weak point 154 has a first element 154a and a pair of second elements 154b.

[0031] The first element 154a extends in the second direction (width direction). The first element 154a extends to a position corresponding to the end of the safety valve SV in the second direction.

[0032] A pair of second elements 154b are connected to each end of the first element 154a in the second direction and extend in the first direction.

[0033] The adhesive member 180 is provided between the lower surface (valve mounting surface 114a) of each energy storage stack 11-14 and the heat insulating member 150. The adhesive member 180 adheres the heat insulating member 150 to the valve mounting surface 114a. As shown in Figure 5, the adhesive member 180 is provided in a portion that includes the portion facing each safety valve SV. For example, the adhesive member 180 may be provided over the entire surface of the heat insulating member 150 that faces each safety valve SV (the upper surface in this embodiment). In Figure 5, the area where the adhesive member 180 is provided is indicated by a diagonal line.

[0034] The housing 200 houses a plurality of energy storage cells 100. In this embodiment, the housing 200 houses four energy storage stacks 11 to 14. As shown in Figure 4, the housing 200 has a lower case 210, an upper cover 220, and a panel member 230.

[0035] The lower case 210 is open upwards. The lower case 210 has a bottom wall 212 and a peripheral wall 215.

[0036] The bottom wall 212 is located below each of the energy storage stacks 11-14. The bottom wall 212 may be formed in a flat plate shape.

[0037] The peripheral wall 215 rises from the periphery of the bottom wall 212. The peripheral wall 215 has a shape that collectively surrounds the lower part of each energy storage stack 11 to 14.

[0038] The upper cover 220 is positioned above the multiple energy storage cells 100. In this embodiment, the upper cover 220 is positioned above the four energy storage stacks 11-14. The upper cover 220, together with the lower case 210, houses the four energy storage stacks 11-14 in a sealed state. The peripheral edge of the upper cover 220 is connected to the peripheral edge of the lower case 210 by bolts or the like via a sealing member.

[0039] As shown in Figure 4, the upper cover 220 has an upper wall 225. The upper wall 225 is located above at least one energy storage cell 100. In this embodiment, the upper wall 225 is located above four energy storage stacks 11-14. The upper wall 225 has a top portion 225a and four recesses 225b.

[0040] The top portion 225a is formed flat. The top portion 225a overlaps the ends of each energy storage stack in the second direction in the vertical direction.

[0041] Each recess 225b is recessed downward from the top 225a. Each recess 225b is formed flat. Each recess 225b 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 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 case 114 via a thermally conductive adhesive 910.

[0042] The panel member 230 is located 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 Figure 4, the peripheral edge of the panel member 230 is connected to the lower case 210 via the bracket 80.

[0043] The structural member 300 is provided on the bottom wall 212. Each of the energy storage stacks 11-14, the bottom wall 212, and the structural member 300 define a space S below each of the energy storage stacks 11-14. In this embodiment, the structural member 300, together with each of the energy storage stacks 11-14 and the bottom wall 212, defines a space S below the energy storage stacks 11-14. In other words, in this embodiment, four spaces S are formed within the housing 200.

[0044] 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.

[0045] As shown in Figure 3, an explosion-proof valve 290 is provided in the portion of the peripheral wall 215 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.

[0046] As shown in Figure 4, the structural member 300 is in contact with both ends of the valve mounting surface 114a of each energy storage cell 100 in the second direction, and with the bottom wall 212. The structural member 300 may support each energy storage stack 11-14. In this embodiment, the structural member 300 has a pair of base portions 310 and a pair of sealing portions 320.

[0047] The pair of base sections 310 are connected to the bottom wall 212 by welding or the like. The pair of base sections 310 are positioned opposite each other in the second direction (width direction), with the safety valve SV in between.

[0048] Each sealing portion 320 is in contact with the valve mounting surface 114a of the energy storage cell 100 and the base portion 310. Each sealing portion 320 may be made of urethane resin. Each sealing portion 320 extends in a first direction. The inner surface of the sealing portion 320 in a second direction is in contact with the smoke exhaust path S. The end of the heat insulating member 150 in a second direction may be in contact with the sealing portion 320 or may be separated from the sealing portion 320. The heat insulating member 150 is in contact with the smoke exhaust path S.

[0049] The reinforcing section 400 reinforces the bottom wall 212. The reinforcing section 400 is positioned between a pair of energy storage stacks (a pair of energy storage cell groups) that are adjacent to each other in the second direction. Specifically, as shown in Figure 4, the reinforcing section 400 is positioned between a pair of cell bodies 110 that are adjacent to each other in the second direction, and below a pair of external terminals 120 that are adjacent to each other in the second direction. The reinforcing section 400 overlaps both of the pair of external terminals 120 that face each other in the second direction in the vertical direction.

[0050] The reinforcing portion 400 extends along a first direction. The end of the reinforcing portion 400 in the first direction may be in contact with the peripheral wall 215 or spaced apart from the peripheral wall 215. The reinforcing portion 400 is connected to the base portion 310. In this embodiment, the reinforcing portion 400 is connected to a raised portion 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 the energy storage stacks in a pair of adjacent energy storage stacks (for example, the first energy storage stack 11 and the second energy storage stack 12) and a structural member 300 provided below the other energy storage stack in the pair of energy storage stacks. The reinforcing portion 400 has a shape that protrudes upward from the base portion 310.

[0051] 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 upper wall 225. More specifically, the cooler 500 is mounted in the recess 225b of the upper wall 225.

[0052] 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. In other words, in this embodiment, the cooler 500 is in thermal contact with each energy storage stack 11-14 via the upper wall 225 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 upper wall 225, 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).

[0053] The covering member 600 covers the cooler 500. The covering member 600 may be made of a material that has heat insulating properties. Note that the covering member 600 is not shown in Figures 2 and 3.

[0054] The cooler 500 and the covering member 600 form at least a portion of the passenger compartment floor 30 (see Figure 3). In addition to the cooler 500 and the covering member 600, the passenger compartment floor 30 may also include floor components (cushioning members, carpets, etc.) placed on the covering member 600. Note that the floor components are not shown in Figures 2 and 4.

[0055] In the energy storage device 10 described above, if gas-containing material 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 material collides with the heat insulating member 150. The impact force at this time causes a pair of intermediate weak parts 152 formed on the heat insulating member 150, which are located below the energy storage cell 100, and a counter weak part 154 formed in the region surrounded by the pair of intermediate weak parts 152 to break. As a result, the part of the heat insulating member 150 sandwiched between the pair of intermediate weak parts 152 peels off from the valve mounting surface 114a and separates downward, and the material discharged from the energy storage cell 100 flows into the exhaust gas path S. The gas contained in the material then spreads in the first direction and is discharged from the housing 200 through the explosion-proof valve 290 as shown in Figure 3. Therefore, the adhesion of the contents of the energy storage cell 100 (so-called debris) contained in the material to the external terminals 120 of the energy storage cell 100 is suppressed.

[0056] As described above, in the energy storage device 10 of this embodiment, the heat insulating member 150 is prevented from peeling off from the valve mounting surface 114a of an adjacent energy storage cell adjacent to one energy storage cell 100 due to the discharge pressure of the discharged material, and consequently, the accumulation of a portion of the discharged material from one energy storage cell 100 in the gap between the valve mounting surface 114a of the adjacent battery cell and the heat insulating member 150 is suppressed. Therefore, the discharged material, including gas, from one energy storage cell 100 is prevented from coming into contact with the valve mounting surface 114a of the adjacent energy storage cell.

[0057] Modifications of the above embodiment will be described below.

[0058] <First variation> As shown in Figure 6, the adhesive member 180 may be provided in areas other than those facing each safety valve SV. In this example, the adhesive member 180 is provided only in a pair of regions that sandwich each safety valve SV in the second direction. That is, the adhesive member 180 has a first adhesive portion 181 provided on one side of each safety valve SV in the second direction, and a second adhesive portion 182 provided on the other side of each safety valve SV in the second direction. Each adhesive portion 181, 182 extends from one end to the other of each energy storage stack 11-14 in the first direction.

[0059] <Second variation> As shown in Figure 7, the first element 154a of the opposing weak portion 154 may extend in a direction that intersects both the first and second directions in a plane perpendicular to the vertical direction. The second element 154b may extend in a direction that intersects both the first and second directions in the same plane and may intersect with the first element 154a. In other words, in this example, the first element 154a and the second element 154b are formed in a substantially X shape.

[0060] <Third variation> As shown in Figure 8, the second element 154b of the opposing weak portion 154 may extend in the first direction and intersect with the first element 154a near the middle portion of the first element 154a.

[0061] Those skilled in the art will understand that the exemplary embodiments described above are specific examples of the following embodiments.

[0062] [Aspect 1] Multiple energy storage cells arranged along the first direction, The system comprises a heat insulating member having a shape that extends from a storage cell located at one end of the plurality of storage cells in the first direction to a storage cell located at the other end of the plurality of storage cells in the first direction, Each of the plurality of energy storage cells has a valve mounting surface including a safety valve, The heat insulating member is in contact with the valve mounting surface and includes a plurality of intermediate weak portions. Each of the aforementioned intermediate weak points is formed in a position facing a pair of adjacent energy storage cells in the first direction and extends in a second direction perpendicular to both the first direction and the vertical direction, in an energy storage device.

[0063] In this energy storage device, when gas-containing waste is discharged from the safety valve of one energy storage cell, a pair of intermediate weak points in the insulating material that sandwich the portion of the insulating material facing the energy storage cell rupture, causing the portion of the insulating material facing the energy storage cell to separate from that energy storage cell. As a result, the discharge pressure of the waste prevents the insulating material from separating from the valve mounting surface of the adjacent energy storage cell, and consequently, prevents some of the waste from the energy storage cell from accumulating in the gap between the valve mounting surface of the adjacent energy storage cell and the insulating material. Therefore, contact between the gas-containing waste discharged from one energy storage cell and the valve mounting surface of the adjacent energy storage cell is prevented.

[0064] [Aspect 2] The energy storage device according to embodiment 1, wherein the heat insulating member further includes a counter-weak portion formed at a position opposite each of the safety valves.

[0065] In this embodiment, the opposing weak point is fractured by the gas discharged from the safety valve of one energy storage cell, thus more reliably suppressing the separation of the heat insulating member from the valve mounting surface of the adjacent energy storage cell when gas is discharged from the safety valve of one energy storage cell.

[0066] [Aspect 3] The aforementioned opposing vulnerable portion is A first element extending in the second direction, The energy storage device according to embodiment 2, comprising: a second element extending in the first direction and connected to each end of the first element in the second direction.

[0067] [Aspect 4] The aforementioned opposing vulnerable portion is A first element extending in a direction that intersects both the first and second directions in a plane perpendicular to the vertical direction, The energy storage device according to embodiment 2, comprising a second element that extends in a direction intersecting both the first and second directions within the plane and intersects with the first element.

[0068] [Aspect 5] The aforementioned opposing vulnerable portion is A first element extending in the second direction, The energy storage device according to embodiment 2, further comprising a second element extending in the first direction and intersecting the first element.

[0069] [Aspect 6] The heat insulating member is further provided with an adhesive member for adhering it to the valve mounting surface, The energy storage device according to any one of embodiments 1 to 5, wherein the adhesive member is provided in a portion including a portion facing each of the safety valves.

[0070] [Aspect 7] The heat insulating member is further provided with an adhesive member for adhering it to the valve mounting surface, The energy storage device according to any one of embodiments 1 to 5, wherein the adhesive member is provided in a portion other than the portion facing each of the safety valves.

[0071] 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]

[0072] 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, 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 Valve mounting surface, 114b Terminal mounting surface, 120 External terminal, 150 Heat insulation member, 152 Intermediate weak part, 154 Opposing weak part, 154a First element, 154b Second element, 180 Adhesive member, 181 First adhesive part, 182 Second adhesive part, 200 Housing, 210 Lower case, 212 Bottom wall, 215 Peripheral wall, 220 Upper cover, 225 Top wall, 225a Top part, 225b Recess, 230 Panel member, 290 Explosion-proof valve, 300 Structural member, 310 Base part, 320 Seal part, 400 Reinforcement part, 500 Cooler, 600 Covering member, 910 Thermal conductive adhesive, S Space (smoke exhaust path), SV Safety valve.

Claims

1. Multiple energy storage cells arranged along the first direction, The device comprises a heat insulating member having a shape that extends from a storage cell located at one end of the plurality of storage cells in the first direction to a storage cell located at the other end of the plurality of storage cells in the first direction, Each of the plurality of energy storage cells has a valve mounting surface including a safety valve, The heat insulating member is in contact with the valve mounting surface and includes a plurality of intermediate weak portions. Each of the aforementioned intermediate weak points is formed in a position facing a pair of adjacent energy storage cells in the first direction and extends in a second direction perpendicular to both the first direction and the vertical direction, in an energy storage device.

2. The energy storage device according to claim 1, wherein the heat insulating member further includes a counter-weak portion formed at a position opposite to each of the safety valves.

3. The aforementioned opposing vulnerable portion is A first element extending in the second direction, The energy storage device according to claim 2, comprising: a second element connected to each end of the first element in the second direction and extending in the first direction.

4. The aforementioned opposing vulnerable portion is A first element extending in a direction that intersects both the first and second directions in a plane perpendicular to the vertical direction, The energy storage device according to claim 2, comprising a second element that extends in a direction intersecting both the first and second directions within the plane and intersects with the first element.

5. The aforementioned opposing vulnerable portion is A first element extending in the second direction, The energy storage device according to claim 2, further comprising a second element extending in the first direction and intersecting the first element.

6. The heat insulating member is further provided with an adhesive member for adhering it to the valve mounting surface, The energy storage device according to claim 1, wherein the adhesive member is provided in a portion that includes a portion facing each of the safety valves.

7. The heat insulating member is further provided with an adhesive member for adhering it to the valve mounting surface, The energy storage device according to claim 1, wherein the adhesive member is provided in a portion other than the portion facing each of the safety valves.

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