Power storage device

Abstract

To provide a power storage device capable of reducing influence of heat on a power storage stack located adjacent to a frame part provided with an exhaust path.SOLUTION: Power storage device 10 includes power storage module 100 including a plurality of power storage stacks, and housing case 120 that houses power storage module 100, housing case 120 includes a plurality of frame parts that define regions in which the plurality of power storage stacks are disposed, and the plurality of frame parts include first frame part 213A in which a discharge path through which gas can flow is provided, and second frame part 212 in which the discharge path is not provided. The plurality of power storage stacks include a first power storage stack 101 and a second power storage stack 102 disposed adjacent to each other, the first frame part 213A is disposed between the first power storage stack 101 and the second power storage stack 102, and the first frame part 213A has higher heat resistance than the second frame part 212.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to an electricity storage device, and more particularly to an electricity storage device mounted on a vehicle. [Background technology]

[0002] As a conventional electricity storage device, JP2022-516519A (Patent Document 1) discloses a structure in which a part of a housing case for housing a plurality of electricity storage stacks is formed of a hollow member, and the hollow portion of the hollow member is used as an exhaust path. The hollow member has a plurality of through holes for introducing gas exhausted from the electricity storage device. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2022-516519 Summary of the Invention [Problem to be solved by the invention]

[0004] In Patent Document 1, a hollow member (frame member) with an exhaust path provided therein is disposed between two adjacent power storage stacks. When gas is discharged from one of the two adjacent power storage stacks, the high-temperature gas passes through the inside of the frame member disposed between the two power storage stacks. Therefore, if no measures are taken, the frame portion may melt or break due to heat, which may affect the other of the two adjacent power storage stacks due to the heat.

[0005] The present disclosure has been made in consideration of the above-mentioned problems, and the purpose of the present disclosure is to provide an energy storage device that can reduce the thermal impact on an energy storage stack located adjacent to a frame portion in which an exhaust path is provided. [Means for solving the problem]

[0006] An energy storage device according to the present disclosure includes an energy storage module including a plurality of energy storage stacks, and a housing case that houses the energy storage module. The housing case includes a plurality of frame sections that define areas in which the plurality of energy storage stacks are disposed. The plurality of frame sections include a first frame section having an exhaust path therein through which gas discharged from the energy storage module can flow, and a second frame section that does not have the exhaust path. The plurality of energy storage stacks include a first energy storage stack and a second energy storage stack that are disposed adjacent to each other. The first frame section is disposed between the first energy storage stack and the second energy storage stack. The first frame section has higher heat resistance than the second frame section.

[0007] According to the above configuration, for example, when high-temperature gas discharged from the first power storage stack flows through the exhaust path within the first frame portion, the first frame portion has higher heat resistance than the second frame portion, so that the first frame portion can be prevented from melting or being damaged by the heat. This makes it possible to prevent heat from being transferred from melted or damaged portions to the second power storage stack, thereby reducing the impact of heat transferred from the first frame portion on the second power storage stack.

[0008] In the power storage device according to the present disclosure, the first frame portion and the second frame portion may extend in directions that intersect with each other.

[0009] According to the above configuration, since the second frame portion is not arranged side by side with the first frame portion, the influence of heat transferred from the first frame portion to the second frame portion can be reduced.

[0010] In the power storage device according to the present disclosure, the exhaust path may have one end located on the second frame portion side and extend from the one end in a direction away from the second frame portion. In this case, the first frame portion may be provided with an opening that connects the one end of the exhaust path to a space within the housing case.

[0011] According to the above configuration, the gas flows in a direction away from the second frame, so that the influence of heat on the second frame portion can be suppressed.

[0012] In the power storage device according to the present disclosure, the housing case has a bottom wall to which the plurality of frame portions are fixed, and at least a portion of the first frame portion located around the opening may have higher heat resistance than the bottom wall portion.

[0013] According to the above configuration, the periphery of the opening through which gas exhausted from the first power storage stack is introduced into the exhaust path has high heat resistance, so that deformation or the like of the periphery of the opening due to heat can be suppressed.

[0014] In the power storage device according to the present disclosure, the casing may include a fixed portion that is fixed to a vehicle body. A corner may be formed in an area where the first power storage stack is disposed by the first frame portion and the second frame portion butting against each other. The opening may be provided facing the corner. Of the surfaces of each of the first frame portion and the second frame portion that face the power storage stack, a portion facing the corner may have higher heat resistance than the fixed portion.

[0015] According to the above configuration, gas discharged from the first power storage stack tends to accumulate at the corners, which tend to become hot. The portions of the first frame portion and the second frame portion facing the power storage stack that face the corners have high heat resistance, which makes it possible to prevent the first frame portion and the second frame portion from being damaged or deformed by heat. [Effects of the Invention]

[0016] According to the present disclosure, it is possible to provide an electricity storage device that can reduce the influence of heat on an electricity storage stack that is located next to a frame portion in which an exhaust path is provided. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a schematic diagram showing a vehicle according to an embodiment. [Figure 2] 1 is a schematic cross-sectional view showing a state in which an electricity storage device according to an embodiment is mounted on a vehicle body. [Figure 3] 1 is a schematic exploded perspective view of an electricity storage device according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the embodiments described below, the same or common parts are denoted by the same reference numerals in the drawings, and the description thereof will not be repeated.

[0019] Fig. 1 is a schematic diagram showing a vehicle according to an embodiment. Fig. 2 is a schematic cross-sectional view showing a state in which an electricity storage device according to an embodiment is mounted on a vehicle body. Vehicle 1 according to an embodiment will be described with reference to Figs. 1 and 2.

[0020] The vehicle 1 is a hybrid vehicle that can run using at least one of the power of a motor and an engine, or an electric vehicle that runs using driving force obtained from electrical energy.

[0021] As shown in FIG. 1, a vehicle 1 includes a vehicle body 2, front wheels 3, rear wheels 4, and a power storage device 10. The vehicle body 2 includes a frame member 5. The power storage device 10 is disposed on the lower side of the vehicle body 2. The power storage device 10 is disposed, for example, between the front wheels 3 and the rear wheels 4. Note that a portion of the power storage device 10 may be disposed overlapping at least one of the front wheels 3 and the rear wheels 4 when viewed from the width direction of the vehicle 1. The power storage device 10 has an upper surface 10a. The upper surface 10a may function as a floor member that defines the interior of the vehicle cabin.

[0022] The framework member 5 includes a pair of side members 6 and a pair of side sills 7. The pair of side sills 7 are arranged on both ends of the vehicle 1 in the width direction. The pair of side members 6 are arranged at a distance inside the pair of side sills 7. The pair of side members 6 and the pair of side sills 7 extend along the front-rear direction of the vehicle 1.

[0023] The pair of side members 6 are spaced apart in the width direction of the vehicle 1. A main body 35 of the electricity storage device 10 is disposed in the gap between the pair of side members 6. A gap is provided between the main body 35 and the pair of side members 6. This makes it possible to suppress input of an impact to the electricity storage device 10 even in the event of a side collision of the vehicle 1.

[0024] Fixed portions 36 are provided on both side surfaces of the main body portion 35 in the width direction of the vehicle 1. The fixed portions 36 are fixed to the pair of side members 6 by fastening members 8.

[0025] The framework member 5 also includes a cross framework member 9. The cross framework member 9 straddles from one side sill 7 to the other side sill 7 above the electricity storage device 10. To the cross framework member 9, an upper surface 10a of the electricity storage device 10 is fixed.

[0026] In the above description, the framework member 5 includes a pair of side members 6 and a pair of side sills 7, but is not limited to this. The pair of side sills 7 may also function as the pair of side members 6. In this case, the pair of side members 6 can be omitted, and the above-mentioned fixed portion 36 may be fixed to the pair of side sills 7.

[0027] Fig. 3 is a schematic exploded perspective view of the electricity storage device according to Embodiment 1. The detailed structure of the electricity storage device 10 will be described with reference to Figs.

[0028] The power storage module 100 includes a plurality of power storage stacks 101 to 106. The plurality of power storage stacks 101 to 106 are arranged in a matrix within the accommodation case 120. When the first direction (DR1 direction) is the column direction and the second direction (DR2 direction) is the row direction, the plurality of power storage stacks 101 to 106 are arranged in 3 rows and 2 columns. Note that the first direction is parallel to, for example, the front-to-rear direction of the vehicle 1 in a state in which the power storage device 10 is mounted on the vehicle body 2. The second direction is perpendicular to the first direction and is parallel to the left-to-right direction of the vehicle 1 in the mounted state. The plurality of power storage stacks 101 to 106 are electrically connected in series.

[0029] Each of the multiple power storage stacks 101 to 106 has substantially the same configuration. Here, the power storage stack 101 will be described in detail, and descriptions of the other power storage stacks 102 to 105 will be omitted. In this embodiment, the power storage stack 101 corresponds to a first power storage stack, and the power storage stack 102 corresponds to a second power storage stack.

[0030] The power storage stack 101 includes a plurality of unit cells 110. The plurality of unit cells 110 are arranged, for example, in a second direction. The plurality of unit cells 110 are electrically connected in series.

[0031] The unit cell 110 has a longitudinal shape with the first direction as the longitudinal direction, and a flat rectangular parallelepiped shape with a thickness in the second direction.

[0032] The unit cell 110 includes a housing 112, within which one or more electrode assemblies are housed.

[0033] When a single electrode body is housed in the housing 112, the electrode body has a shape extending in the longitudinal direction. The electrode body may be a laminated electrode body in which a negative electrode sheet, a separator, and a positive electrode sheet are laminated, or may be a wound electrode body in which a negative electrode sheet, a separator, and a positive electrode sheet are wound.

[0034] When multiple electrode bodies are housed in the housing 112, the multiple electrode bodies are arranged side by side in the longitudinal direction and connected in series. In this case, too, the electrode body may be a stacked electrode body or a wound electrode body.

[0035] The unit cell 110 is a secondary battery such as a nickel-metal hydride battery or a lithium-ion battery. The unit cell 110 may use a liquid electrolyte or a solid electrolyte. The unit cell 110 may also be a chargeable and dischargeable capacitor.

[0036] Housing 112 is formed of a metal material such as aluminum. Housing 112 includes first end face 110a and second end face 110b arranged in a first direction, and exhaust valve 111. Exhaust valve 111 is formed on first end face 110a. Exhaust valve 111 opens when the internal pressure of housing 112 exceeds a predetermined value, and exhausts gas inside housing 112 to the outside.

[0037] In each energy storage stack 101, the multiple unit cells 110 are arranged in the second direction with the exhaust valves 111 positioned alternately on one side in the first direction and the other side in the first direction. That is, the multiple unit cells 110 are arranged with the first end faces 110a and the second end faces 110b alternately aligned in the second direction on each of the one side in the first direction and the other side in the first direction.

[0038] The housing case 120 includes an upper member 300 and a lower case 200. The upper member 300 has, for example, a generally box-like shape that opens downward. The upper member 300 includes a top plate 301 and a peripheral wall 302. The peripheral wall 302 extends downward from the outer periphery of the top plate 301. The peripheral wall 302 includes end walls 303 and 304 that are aligned in a first direction, and side walls 305 and 306 that are aligned in a second direction.

[0039] External exhaust ports 311 to 316 are formed in end wall 303. External exhaust ports 321 to 326 are formed in end wall 304. External exhaust ports 311 to 316 are through-holes that pass through end wall 303, and external exhaust ports 321 to 326 are through-holes that pass through end wall 304. External exhaust ports 311 to 316 communicate with exhaust ports 271 to 276, which will be described later, and exhaust gas from the exhaust ports 271 to 276 to the outside of casing 120. External exhaust ports 321 to 326 communicate with exhaust ports 281 to 286, which will be described later, and exhaust gas from the exhaust ports 281 to 286 to the outside of casing 120.

[0040] The lower case 200 includes a plurality of frame portions 210, a bottom wall portion 220, and a sealing member 221. The plurality of frame portions 210 and the sealing member 221 are provided on the upper surface of the bottom wall portion 220. The lower case 200 includes a main body portion 35 and a fixed portion 36. The main body portion 35 is made up of the plurality of frame portions 210 and the bottom wall portion 220. The fixed portion 36 is provided on both side surfaces of the main body portion 35 in the second direction. The fixed portion 36 is made up of a metal member such as SUS.

[0041] The frame portions 210 define an area in which the power storage stacks 101 to 106 are arranged. Each of the frame portions 210 is made of a metal member. The frame portions 210 include a pair of side frame portions 211A, 211B, a pair of first frame portions 213A, 214A, a second frame portion 212, and a pair of third frame portions 213B, 214B.

[0042] The pair of side frame portions 211A, 211B, the second frame portion 212, the pair of first frame portions 213A, 214A, and the pair of third frame portions 213B, 214B are fixed to the bottom wall portion.

[0043] The pair of first frame portions 213A, 214A and the second frame portion 212 extend in directions that intersect with each other. Similarly, the pair of third frame portions 213B, 214B and the second frame portion 212 extend in directions that intersect with each other. The pair of first frame portions 213A, 214A and the pair of third frame portions 213B, 214B extend in a first direction, and the second frame portion 212 extends in a second direction.

[0044] The pair of side frame portions 211A, 211B are arranged at an interval in the second direction. The pair of side frame portions 211A, 211B are arranged on both sides of the bottom plate in the second direction. The pair of side frame portions 211A, 211B extend along the first direction.

[0045] The second frame portion 212 extends in the second direction on the upper surface of the bottom wall portion 220. The second frame portion 212 is disposed in approximately the center of the bottom wall portion 220 in the first direction DR1. The second frame portion 212 divides the space inside the accommodating case 120 in the first direction.

[0046] The pair of first frame portions 213A, 214A are arranged in a space on one side in the first direction within accommodating case 120, which is partitioned by second frame portion 212. The pair of first frame portions 213A, 214A are arranged between the pair of side frame portions 211A, 211B on one side in the first direction. The pair of first frame portions 213A, 214A are arranged apart from the pair of side frame portions 211A, 211B, and are arranged with a gap in the second direction.

[0047] The pair of first frame portions 213A, 214A divide in the second direction the space inside accommodating case 120 located on one side in the first direction of second frame portion 212. Specifically, the pair of first frame portions 213A, 214A divide the space inside accommodating case 120 on one side in the first direction into three in the second direction.

[0048] In the space within the storage case located on one side of the first direction, the storage stacks 101 to 103 are arranged in each area (first area 291, second area 292, third area 293) partitioned by a pair of side frame portions 211A, 211B, a pair of first frame portions 213A, 214A and a second frame portion 212.

[0049] The first frame portion 213A is disposed between the power storage stack 101 and the power storage stack 102, and the first frame portion 214A is disposed between the power storage stack 102 and the power storage stack 103.

[0050] The pair of third frame portions 213B, 214B are disposed in a space on the other side in the first direction within accommodating case 120, which is partitioned by second frame portion 212. The pair of third frame portions are disposed between the pair of side frame portions 211A, 211B on the other side in the first direction. The pair of third frame portions 213B, 214B are disposed away from the pair of side frame portions 211A, 211B, and are disposed with a gap between them in the second direction.

[0051] The pair of third frame portions 213B, 214B divide in the second direction the space within the accommodating case 120 located on the other side in the first direction of the second frame portion 212. Specifically, the pair of third frame portions 213B, 214B divide the space within the accommodating case 120 on the other side in the first direction into three in the second direction. In the space within the accommodating case located on the other side in the first direction, the power storage stacks 104 to 106 are arranged in each of the regions (fourth region 294, fifth region 295, sixth region 296) partitioned by the pair of side frame portions 211A, 211B, the pair of third frame portions 213B, 214B, and the second frame portion 212.

[0052] The third frame portion 213B is disposed between the power storage stack 104 and the power storage stack 105, and the third frame portion 214B is disposed between the power storage stack 105 and the power storage stack .

[0053] Exhaust paths through which gas discharged from the power storage stack can flow are provided inside the pair of side frame portions 211A, 211B, the pair of first frame portions 213A, 214A, and the pair of third frame portions 213B, 214B. Each exhaust path has one end on the second frame portion 212 side and extends from that end in a direction away from the second frame portion 212. Note that no exhaust path is provided in the second frame portion 212.

[0054] The pair of side frame portions 211A, 211B, the pair of first frame portions 213A, 214A, and the pair of third frame portions 213B, 214B have higher heat resistance than the second frame portion 212. Having high heat resistance means that the pair of side frame portions 211A, 211B, the pair of first frame portions 213A, 214A, and the pair of third frame portions 213B, 214B are made of a material having a higher melting point than the second frame portion, or that a heat-resistant member such as mica is provided on the surfaces of the pair of side frame portions 211A, 211B, the pair of first frame portions 213A, 214A, and the pair of third frame portions 213B, 214B.

[0055] The side frame portion 211A is provided with an outlet 275, an outlet 285, and openings 255, 265. The outlet 275 is provided in an end surface of the side frame portion 211A located on one side in the first direction. The outlet 285 is provided in an end surface of the side frame portion 211A located on the other side in the first direction.

[0056] The opening 255 is open toward the first region 291. The opening 255 is open on the second frame portion 212 side. Specifically, the opening 255 is provided in a state facing a corner formed in the first region 291 when one end of the second frame portion 212 located on one side in the second direction abuts against the side frame portion 211A. An exhaust path 235 (see FIG. 2) is provided inside the side frame portion 211A. The opening 255 connects one end of the exhaust path 235 located on the second frame portion 212 side with the first region 291. The opening 255 is in communication with the exhaust port 275 via the exhaust path 235.

[0057] The opening 265 opens toward the fourth region 294. Specifically, the opening 265 opens on the second frame portion 212 side. Specifically, the opening 265 is provided in a state facing a corner formed in the fourth region 294 when one end of the second frame portion 212 located on one side in the second direction abuts against the side frame portion 211A. An exhaust path (not shown) is provided inside the side frame portion 211A. The opening 265 connects one end of the exhaust path located on the second frame portion 212 side with the fourth region 294. The opening 265 communicates with the exhaust port 285 via the exhaust path.

[0058] Openings 251 and 252 are provided in the first frame portion 213A. The opening 251 is open toward the first region 291. The opening 251 is provided in a main surface of the first frame portion 213A located on one side in the second direction. The opening 252 is open toward the second region 292. The opening 252 is provided in a main surface of the first frame portion 213A located on the other side in the second direction.

[0059] The openings 251, 252 are provided facing corners formed in the first region 291 and the second region 292 when the first frame portion 213A abuts against the second frame portion 212. Exhaust paths 231, 232 (see FIG. 2) are provided inside the first frame portion 213A. The opening 251 connects one end of the exhaust path 231 to the first region 291, and the opening 252 connects one end of the exhaust path 232 to the second region 292. The openings 251, 252 communicate with exhaust ports 271, 272 via the exhaust paths 231, 232. The exhaust ports 271, 272 are provided in an end surface of the first frame portion 213A located on one side in the first direction.

[0060] Openings 253 and 254 are provided in the first frame portion 214A. The opening 253 is open toward the second region 292. The opening 253 is provided in a main surface of the first frame portion 214A located on one side in the second direction. The opening 254 is open toward the third region 293. The opening 254 is provided in a main surface of the first frame portion 214A located on the other side in the second direction.

[0061] The openings 253, 254 are provided facing corners formed in the second region 292 and the third region 293 when the first frame portion 214A abuts against the second frame portion 212. Exhaust paths 233, 234 (see FIG. 2) are provided inside the first frame portion 214A. The opening 251 connects one end of the exhaust path 233 to the second region 292, and the opening 254 connects one end of the exhaust path 234 to the third region 293. The openings 253, 253 communicate with exhaust ports 273, 274 via the exhaust paths 233, 234. The exhaust ports 273, 274 are provided in an end surface of the first frame portion 214A located on one side in the first direction.

[0062] Openings 261 and 262 are provided in the third frame portion 213B. The opening 261 is open toward the fourth region 294. The opening 261 is provided in a main surface of the third frame portion 213B located on one side in the second direction. The opening 262 is open toward the fifth region 295. The opening 262 is provided in a main surface of the third frame portion 213B located on the other side in the second direction.

[0063] The openings 261, 262 are provided facing corners formed in the fourth region 294 and the fifth region 295 by the third frame portion 213B butting against the second frame portion 212. The openings 261, 262 communicate with the exhaust ports 281, 282 via exhaust paths (not shown) provided inside the third frame portion 213B. The exhaust ports 281, 282 are provided in the end surface of the third frame portion 213B located on the other side in the first direction.

[0064] Openings 263 and 264 are provided in the third frame portion 214B. The opening 263 is open toward the fifth region 295. The opening 263 is provided in a main surface of the third frame portion 214B located on one side in the second direction. The opening 264 is open toward the sixth region 296. The opening 264 is provided in a main surface of the third frame portion 214B located on the other side in the second direction.

[0065] The openings 263, 264 are provided facing corners formed in the fifth region 295 and the sixth region 296 when the third frame portion 214B abuts against the second frame portion 212. The openings 263, 264 communicate with the discharge ports 283, 284 via flow paths (not shown) provided inside the third frame portion 214B. The discharge ports 283, 284 are provided in the end surface of the third frame portion 214B located on the other side in the first direction.

[0066] The side frame portion 211B is provided with an outlet 276, an outlet 286, and openings 256, 266. The outlet 276 is provided in an end surface of the side frame portion 211B located on one side in the first direction. The outlet 286 is provided in an end surface of the side frame portion 211B located on the other side in the first direction.

[0067] The opening 256 is open toward the third region 293. The opening 256 is open on the second frame portion 212 side. Specifically, the opening 256 is provided in a state facing a corner formed in the third region 293 when the other end of the second frame portion 212 located on the other side in the second direction abuts against the side frame portion 211B. An exhaust path 236 (see FIG. 2) is provided inside the side frame portion 211B. The opening 256 connects one end of the exhaust path 236 located on the second frame portion 212 side with the third region 293. The opening 256 is in communication with the exhaust port 276 via the exhaust path 236.

[0068] The opening 266 opens toward the sixth region 296. Specifically, the opening 266 opens on the second frame portion 212 side. Specifically, the opening 266 is provided in a state facing a corner formed in the sixth region 296 when the other end of the second frame portion 212 located on the other side in the second direction abuts against the side frame portion 211B. An exhaust path (not shown) is provided inside the side frame portion 211B. The opening 266 connects one end of the exhaust path located on the second frame portion 212 side with the sixth region 296. The opening 265 communicates with the exhaust port 286 via the exhaust path.

[0069] In this embodiment, when any of the unit cells 110 included in one of the storage stacks of the storage stacks 101 and 102 generates heat and gas is discharged from the unit cell 110, the gas is discharged outside the storage case 120 through an exhaust path 231 or 232 provided in the first frame portion 213A arranged between the storage stacks 101 and 102.

[0070] In this case, because the first frame portion 213A has higher heat resistance than the second frame portion 212, even if gas flows inside the first frame portion 213A, the first frame portion 213 can be prevented from melting or being damaged by heat. This makes it possible to prevent heat from being transferred from melted or damaged portions to the second power storage stack, thereby reducing the impact of heat transferred from the first frame portion on the second power storage stack. Note that the first frame portion may be configured to have lower heat dissipation properties than the second frame portion.

[0071] Even if one of the unit cells 110 included in one of the storage stacks of the storage stack 102 and the storage stack 103 generates heat, the same effect as described above can be obtained because the first frame portion 214A, which has higher heat resistance than the second frame portion 212, is placed between the storage stack 102 and the storage stack 103.

[0072] Furthermore, on the other side in the first direction, the third frame portions 213B, 214B also have higher heat resistance than the second frame portion 212. Therefore, even if any of the unit cells 110 included in any of the power storage stacks 104 to 106 generates heat, the thermal effect on other power storage stacks adjacent to any of the power storage stacks with the third frame portion through which gas flows sandwiched therebetween can be reduced, as described above.

[0073] Furthermore, the pair of side frame portions 211A, 211B, the pair of first frame portions 213A, 214A, and the pair of third frame portions 213B, 214B extend in directions that intersect with the second frame portion 212. This means that the second frame portion 212 is not arranged side-by-side with the frame portion in which the exhaust path is provided, thereby reducing the effect of heat transferred from that frame portion on the second frame portion.

[0074] Furthermore, gas flows in the exhaust path provided in each frame portion in a direction away from the second frame portion 212, so that the influence of heat on the second frame portion can be suppressed.

[0075] Additionally, in each of the pair of side frame portions 211A, 211B, the pair of first frame portions 213A, 214A, and the pair of third frame portions 213B, the portions located around the openings have higher heat resistance than the bottom wall portion 220. This makes it possible to prevent the periphery of the openings from being deformed by heat when gas is introduced into the exhaust path from the openings.

[0076] Furthermore, when gas is discharged as described above, gas tends to accumulate at the corners formed by the collision between the pair of side frame portions 211A, 211B, the pair of first frame portions 213A, 214A, and the pair of third frame portions 213B, 214B and the second frame portion 212, and the corners tend to become hot. Therefore, by having the corners of the surfaces of each of the frame portions facing the power storage stack have higher heat resistance than the fixed portions, damage and deformation of each frame portion can be suppressed. Specifically, for example, by having the corners of the surfaces of each of the first frame portions 213A, 214A and the second frame portion 212 facing the power storage stack have high heat resistance, deformation of the first frame portions 213A, 214A and the second frame portion 212 due to heat can be suppressed.

[0077] In the above description, the first direction is parallel to the front-rear direction of the vehicle 1, and the second direction is parallel to the width direction of the vehicle 1, but this is not limiting. The first direction may be parallel to the width direction of the vehicle 1, and the second direction may be parallel to the front-rear direction of the vehicle 1.

[0078] In the above description, the case where each of the plurality of unit cells 110 in each power storage stack has its longitudinal direction in the first direction and is arranged in the second direction has been described as an example, but this is not limiting. In each power storage stack, each of the plurality of unit cells 110 may have its longitudinal direction in the second direction and be arranged in the first direction. In this case, the exhaust valve 111 may be provided on a side surface of the housing 112 in the second direction.

[0079] Furthermore, although the above description has been given with reference to an example in which upper member 300 includes top plate 301 and peripheral wall 302, the present invention is not limited thereto, and upper member 300 may be configured only by top plate 301. In this case, lower case 200 may include a first end wall portion connecting end faces located on one side in the first direction of paired side frame portions 211A, 211B and paired first frame portions 213A, 214, and a second end wall portion connecting end faces located on the other side in the first direction of paired side frame portions 211A, 211B and paired third frame portions 213B, 214B. Furthermore, in this case, the first end wall portion may be provided with an external discharge port communicating with the above-mentioned discharge ports 271-276, and the second end wall portion may be provided with an external discharge port communicating with the above-mentioned discharge ports 281-286.

[0080] The embodiments disclosed herein are illustrative in all respects and are not restrictive. The scope of the present invention is defined by the claims, and includes all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0081] REFERENCE SIGNS LIST 1 vehicle, 2 vehicle body, 3 front wheel, 4 rear wheel, 5 frame member, 6 side member, 7 side sill, 8 fastening member, 9 cross frame member, 10 power storage device, 10a upper surface, 35 main body portion, 36 fixed portion, 100 power storage module, 101, 102, 103, 104, 105, 106 power storage stack, 110 unit cell, 110a first end surface, 110b second end surface, 111 exhaust valve, 112 housing, 120 storage case, 200 lower case, 210 frame portion, 211A, 211B side frame portion, 212 second frame portion, 213A, 214A first frame portion, 213B, 214B third frame portion, 220 bottom wall portion, 221 Seal members, 231, 232, 233, 234, 235, 236 Exhaust paths, 251, 252, 253, 254, 255, 256, 261, 262, 263, 264, 265, 266 Openings, 271, 272, 273, 274, 275, 276, 281, 282, 283, 284, 285, 286 Exhaust ports, 291 First region, 292 Second region, 293 Third region, 294 Fourth region, 295 Fifth region, 296 Sixth region, 300 Upper member, 301 Top plate, 302 Peripheral wall, 303, 304 End walls, 305, 306 Side walls, 311, 316, 321, 326 External exhaust ports.

Claims

1. a power storage module including a plurality of power storage stacks; a housing case that houses the power storage module, the housing case includes a plurality of frame portions that define areas in which the plurality of power storage stacks are arranged, the plurality of frame portions include a first frame portion having an exhaust path provided therein through which gas discharged from the power storage module can flow, and a second frame portion not provided with the exhaust path; the plurality of power storage stacks include a first power storage stack and a second power storage stack arranged adjacent to each other, the first frame portion is disposed between the first power storage stack and the second power storage stack, The first frame portion has higher heat resistance than the second frame portion.

2. The power storage device according to claim 1 , wherein the first frame portion and the second frame portion extend in directions intersecting each other.

3. the exhaust path has one end located on the second frame portion side and extends from the one end in a direction away from the second frame portion, The power storage device according to claim 2 , wherein the first frame portion is provided with an opening that connects the one end of the exhaust path to a space within the accommodating case.

4. the storage case has a bottom wall to which the plurality of frame portions are fixed, The power storage device according to claim 3 , wherein at least a portion of the first frame portion positioned around the opening has higher heat resistance than the bottom wall portion.

5. the housing case includes a fixed portion that is fixed to a vehicle body, a corner portion is formed in a region where the first power storage stack is disposed by the first frame portion and the second frame portion butting against each other, The opening is provided facing the corner portion, 4. The energy storage device according to claim 3, wherein the portions of the surfaces of the first frame portion and the second frame portion facing the energy storage stack that face the corner portions have higher heat resistance than the fixed portions.

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