Power storage device

Abstract

To discharge gas discharged from a power storage cell to the outside of a case without forming many intake holes in the case housing the power storage cell.SOLUTION: First power storage module 10C and second power storage module 10D are disposed in the Y direction in housing case 20. A first space 10C is formed between the first power storage module 10D and the second power storage module 20a, and the first sidewall EP1 in the + X direction. A second space 10C is formed between the first power storage module 10D and the second power storage module 20b, and the first sidewall EP2 in the - X direction. Case discharge valves 211 for discharging gas discharged from power storage cells 100 to the outside of housing case 20 are provided on the third sidewall portion 20c and the fourth sidewall portion 20d in the Y direction.SELECTED DRAWING: Figure 5

Description

[Technical Field]

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

[0002] JP 2022-516519 A (Patent Document 1) discloses a battery pack in which a housing case for housing cells is partially constructed from a hollow member, and the hollow portion of the hollow member is used as a smoke exhaust passage (gas passage). The hollow member that constitutes part of the housing case has multiple intake holes formed therein to introduce gas exhausted from the cells. [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, the air intake holes are arranged in one-to-one correspondence facing the explosion-proof valves (exhaust valves, safety valves) of the cells, and gas discharged from the explosion-proof valves of the cells flows into the smoke exhaust passage through the corresponding air intake holes. The configuration of Patent Document 1 requires processing to form air intake holes equivalent to the number of cells, which increases manufacturing costs.

[0005] An object of the present disclosure is to exhaust gas emitted from the energy storage cells to the outside of the case without forming many air intake holes in the case that houses the energy storage cells. [Means for solving the problem]

[0006] The energy storage device disclosed herein includes a first energy storage module including a first plurality of energy storage cells, a second energy storage module including a second plurality of energy storage cells, and a housing case that houses the first energy storage module and the second energy storage module. The first energy storage module and the second energy storage module are arranged in a first direction. The housing case includes a first side wall portion located on one side of a second direction perpendicular to the first direction and a second side wall portion located on the other side of the second direction. A first space is formed between the first energy storage module and the second energy storage module and the first side wall. A second space is formed between the first energy storage module and the second energy storage module and the second side wall. The housing case is provided with a case exhaust valve that exhausts gas discharged from at least one of the first plurality of energy storage cells and the second plurality of energy storage cells to the outside of the housing case.

[0007] According to this configuration, the first and second energy storage modules are arranged in a first direction and housed in a housing case. The housing case includes a first side wall and a second side wall. The first side wall is located on one side of a second direction perpendicular to the first direction, and the second side wall is located on the other side of the second direction. A first space is formed between the first and second energy storage modules and the first side wall. A second space is formed between the first and second energy storage modules and the second side wall. The housing case is provided with a case exhaust valve, and gas discharged from the energy storage cells is discharged to the outside of the housing case via the case exhaust valve. The gas discharged from the energy storage cells can be discharged to the outside of the housing case through the first and second spaces, and the gas discharged from the energy storage cells can be discharged to the outside of the housing case without forming many air intake holes in the housing case.

[0008] Preferably, the storage case further includes a third side wall located on one side in the first direction and a fourth side wall located on the other side in the first direction. The case exhaust valve includes a first case exhaust valve and a second case exhaust valve provided on the third side wall at positions facing the first space and the second space, respectively. The case exhaust valve includes a third case exhaust valve and a fourth case exhaust valve provided on the fourth side wall at positions facing the first space and the second space, respectively.

[0009] According to this configuration, the case exhaust valve is provided at a position facing the first space and the second space, so that gas can be efficiently exhausted.

[0010] Preferably, the first plurality of energy storage cells are arranged in the second direction. The second plurality of energy storage cells are arranged in the second direction. At least one of the first plurality of energy storage cells has an exhaust valve that discharges gas toward the second energy storage module. At least one of the second plurality of energy storage cells has an exhaust valve that discharges gas toward the first energy storage module. A first guide member that guides gas from the center in the first direction toward the first case exhaust valve and the third case exhaust valve is arranged adjacent to the first energy storage module and the second energy storage module in the first space. A second guide member that guides gas from the center in the first direction toward the second case exhaust valve and the fourth case exhaust valve is arranged adjacent to the first energy storage module and the second energy storage module in the second space.

[0011] According to this configuration, the guide member can guide the gas discharged from the electricity storage cells to the case exhaust valve, thereby preventing the gas from accumulating. [Effects of the Invention]

[0012] According to the present disclosure, gas emitted from the energy storage cells can be discharged to the outside of the case without forming many air intake holes in the case that houses the energy storage cells. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is an exploded perspective view of an electricity storage device according to an embodiment of the present disclosure. [Figure 2] FIG. [Figure 3] FIG. 10 is a plan view of an electricity storage device according to a second embodiment. [Figure 4] FIG. 11 is a plan view of an electricity storage device according to a third embodiment. [Figure 5] FIG. 11 is a plan view of an electricity storage device according to a fourth embodiment. [Figure 6] FIG. 13 is a plan view of an electricity storage device according to a fifth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0014] Embodiments of the present disclosure will be described in detail with reference to the drawings. In the drawings, identical or corresponding parts are designated by the same reference numerals, and their description will not be repeated. In the drawings used below, the mutually orthogonal X-axis, Y-axis, and Z-axis are indicated by a "+" in the direction indicated by the X-axis, Y-axis, and Z-axis arrows, and by a "-" in the opposite direction. The dimensional relationships (length, width, thickness, etc.) in the drawings do not reflect the actual dimensional relationships.

[0015] (Embodiment 1) 1 is an exploded perspective view of a power storage device 1 according to an embodiment of the present disclosure. The power storage device 1 is, for example, a power storage device mounted on an electric vehicle (BEV) that does not have an internal combustion engine. However, the present invention is not limited to this, and the power storage device 1 may also be mounted on a PHEV (plug-in hybrid vehicle) that has an internal combustion engine, or on other electrically powered vehicles (xEV).

[0016] The energy storage device 1 includes a plurality of energy storage modules 10 (a first energy storage module 10A and a second energy storage module 10B) and a housing case 20 that houses the energy storage modules 10. The first energy storage module 10A and the second energy storage module 10B have the same configuration and include a plurality of energy storage cells 100.

[0017] The storage case 20 of the power storage device 1 includes an LWR (lower) case 21 and an UPR (upper) case 22. The LWR case 21 includes a plate-shaped bottom 21t and a plurality of side walls 20a to 20d. The first side wall 20a is disposed on the +X side, and the second side wall 20b is disposed on the -X side. The third side wall 20c is disposed on the -Y side, and the fourth side wall 20d is disposed on the +Y side.

[0018] The first energy storage module 10A and the second energy storage module 10B are arranged adjacent to each other in the Y direction. The Y direction corresponds to the "first direction" in the present disclosure. The energy storage cells 100 included in the first energy storage module 10A are arranged in the X direction. The energy storage cells 100 included in the second energy storage module 10B are arranged in the X direction. The X direction corresponds to the "second direction" in the present disclosure.

[0019] The UPR case 22 functions as a lid for the LWR case 21. After the first power storage module 10A and the second power storage module 10B are fixed to the bottom 21t of the LWR case 21, the UPR case 22 is attached to the LWR case 21. In this way, the first power storage module 10A and the second power storage module 10B are housed in the housing case 20.

[0020] A plurality of case exhaust valves 211 (211a to 211d) are provided on the third side wall portion 20c and the fourth side wall portion 20d of the LWR case 21. The case exhaust valves 211 open when the pressure inside the storage case 20 exceeds a predetermined pressure. The case exhaust valves 211 exhaust gas discharged from the energy storage cells 100 to the outside of the storage case 20.

[0021] A mounting bracket 30 is fixed to the LWR case 21. The storage case 20 is fixed to, for example, the floor of a vehicle by the mounting bracket 30.

[0022] FIG. 2 is a plan view of the energy storage device 1. In FIG. 2, the UPR case 22 is not shown. The energy storage cells 100 are fixed to the bottom 21t of the LWR case 21 by adhesive, for example. A first energy storage module 10A is configured by arranging a plurality of energy storage cells 100 in the X direction. The energy storage cells 100 included in the first energy storage module 10A correspond to the "first plurality of energy storage cells" in the present disclosure. A second energy storage module 10B is configured by arranging a plurality of energy storage cells 100 in the X direction. The energy storage cells 100 included in the second energy storage module 10B correspond to the "second plurality of energy storage cells" in the present disclosure. The first energy storage module 10A and the second energy storage module 10B are arranged adjacent to each other in the Y direction.

[0023] The first and second energy storage modules 10A and 10B each have a structure in which multiple energy storage cells 100 are stacked in the X direction. An electrode assembly is housed within the case of the energy storage cell 100. The electrode assembly is, for example, a wound body in which a positive electrode sheet and a negative electrode sheet are wound with a separator interposed therebetween. For example, one or more wound bodies functioning as electrode assemblies may be housed within a metal rectangular case, covered with a laminate outer casing. The electrode assembly may also be a laminate in which a positive electrode sheet and a negative electrode sheet are stacked with a separator interposed therebetween. Each of the positive electrode sheet and the negative electrode sheet includes an electrode foil and an active material layer. The energy storage cell 100 is a secondary battery such as a lithium-ion battery, a nickel-metal hydride battery, or a sodium-ion battery. Examples of lithium-ion batteries include an LFP battery using lithium iron phosphate as the positive electrode active material or a ternary battery using NMC (nickel-manganese-cobalt) as the positive electrode active material. The secondary battery may be a liquid secondary battery or a solid secondary battery.

[0024] The energy storage cell 100 has a rectangular parallelepiped shape with the Y direction as the longitudinal direction. The ratio of the length (dimension in the Y direction) of the energy storage cell 100 to the width (dimension in the X direction) may be 4 or more and 25 or less. The width and length of the energy storage cell 100 may be approximately 50 mm and approximately 1000 mm, respectively. The height (dimension in the Z direction) of the energy storage cell 100 is equal to or less than the height of the plurality of side wall portions 20a to 20d. The height of the energy storage cell 100 may be approximately 100 mm.

[0025] The energy storage cell 100 has a first end face 100a and a second end face 100b in the longitudinal direction (Y direction). The first end face 100a has an exhaust valve 111. The exhaust valve 111 opens when the internal pressure of the energy storage cell 100 exceeds a predetermined pressure, and discharges gas inside the energy storage cell 100 to the outside of the energy storage cell 100. In the first energy storage module 10A, each energy storage cell 100 is arranged so that the first end face 100a faces the -Y side and the second end face 100b faces the +Y side. In the second energy storage module 10B, each energy storage cell 100 is arranged so that the first end face 100a faces the +Y side and the second end face 100b faces the -Y side.

[0026] An external terminal 112 is provided on a first end surface 100a of the energy storage cell 100 in addition to an exhaust valve 111. An external terminal 113 and a connector 114 are provided on a second end surface 100b of the energy storage cell 100. In this embodiment, the external terminal 112 may be a positive terminal, and the external terminal 113 may be a negative terminal. The connector 114 includes an output terminal that outputs a detection signal indicating the state of the energy storage cell 100 (for example, the internal temperature of the energy storage cell 100) to the outside.

[0027] In the first energy storage module 10A and the second energy storage module 10B, the external terminals 112 of adjacent energy storage cells 100 are connected by a bus bar, and the external terminals 113 of adjacent energy storage cells 100 are connected by a bus bar. In the present embodiment, in the first energy storage module 10A and the second energy storage module 10B, the plurality of energy storage cells 100 are electrically connected in parallel.

[0028] In the first energy storage module 10A, the first end faces 100a of the energy storage cells 100 are arranged to face the third side wall portion 20c. A third space EP3 is formed between the first end faces 100a of the energy storage cells 100 (first energy storage module 10A) and the third side wall portion 20c. In the second energy storage module 10B, the first end faces 100a of the energy storage cells 100 are arranged to face the fourth side wall portion 20d. A fourth space EP4 is formed between the first end faces 100a of the energy storage cells 100 (second energy storage module 10B) and the fourth side wall portion 20d. The exhaust valves 111 of the energy storage cells 100 included in the first energy storage module 10A face the third space EP3. The exhaust valves 111 of the energy storage cells 100 included in the second energy storage module 10B face the fourth space EP4. The third space EP3 is a gap between the first power storage module 10A and the third side wall portion 20c, and the fourth space EP4 is a gap between the second power storage module 10B and the fourth side wall portion 20d.

[0029] A first space EP1 is formed between the first side wall portion 20a of the LWR case 21 and the first power storage module 10A, and between the first side wall portion 20a and the second power storage module 10B. A second space EP2 is formed between the second side wall portion 20b of the LWR case 21 and the first power storage module 10A, and between the second side wall portion 20b and the second power storage module 10B. The first space EP1 is a gap formed between the first power storage module 10A and the second power storage module 10B and the first side wall portion 20a. The second space EP2 is a gap formed between the first power storage module 10A and the second power storage module 10B and the second side wall portion 20b.

[0030] Case exhaust valves 211 are provided on the third side wall portion 20c of the LWR case 21 at positions facing the first space EP1 and the second space EP2. The case exhaust valve 211a is provided at a position facing the first space EP1, and the case exhaust valve 211b is provided at a position facing the second space EP2. The case exhaust valve 211a corresponds to the "first case exhaust valve" in this disclosure, and the case exhaust valve 211b corresponds to the "second case exhaust valve" in this disclosure. The fourth side wall portion 20d is provided with case exhaust valves 211 at positions facing the first space EP1 and the second space EP2. The case exhaust valve 211c is provided at a position facing the first space EP1, and the case exhaust valve 211d is provided at a position facing the second space EP2. Case exhaust valve 211c corresponds to the "third case exhaust valve" of this disclosure, and case exhaust valve 211d corresponds to the "fourth case exhaust valve" of this disclosure.

[0031] Gas is discharged from the exhaust valves 111 of the energy storage cells 100 included in the first energy storage module 10A toward the third space EP3. Gas is discharged from the exhaust valves 111 included in the second energy storage module 10B toward the fourth space EP4. As indicated by the dashed-two-dot arrows, this gas passes through the first space EP1, the second space EP2, the third space EP3, and the fourth space EP4, and is then discharged from the case exhaust valves 211a to 211d to the outside of the accommodating case 20. Gas discharged from the energy storage cells 100 can be discharged to the outside of the accommodating case 20 without forming many ventilation holes in the accommodating case 20.

[0032] The case exhaust valves 211a and 211b are provided on the third side wall portion 20c at positions facing the first space EP1 and the second space EP2, respectively. The case exhaust valves 211c and 211d are provided on the fourth side wall portion 20d at positions facing the first space EP1 and the second space EP2, respectively. This allows gas flowing through the first space EP1 and the second space EP2 to be efficiently exhausted to the outside of the accommodation case 20 through the case exhaust valves 211a to 211d.

[0033] (Embodiment 2) Fig. 3 is a plan view of the electricity storage device according to the embodiment 2. In the embodiment 2, the configuration of the accommodating case 20 is the same as that in the embodiment 1. In Fig. 3, the UPR case 22 is not shown.

[0034] In the second embodiment, the first energy storage module 10A and the second energy storage module 10B are different from the first embodiment in the orientation of the Y direction. In the first energy storage module 10A, the second end faces 100b of the energy storage cells 100 are arranged to face the third side wall portion 20c. In the second energy storage module 10B, the second end faces 100b of the energy storage cells 100 are arranged to face the fourth side wall portion 20d. The first end faces 100a of the energy storage cells 100 of the first energy storage module 10A and the first end faces 100a of the energy storage cells 100 of the second energy storage module 10B are arranged to face each other, and a fifth space EP5 is formed between the first energy storage module 10A and the second energy storage module 10B. The exhaust valves 111 of the energy storage cells 100 of the first energy storage module 10A and the second energy storage module 10B face the fifth space EP5. The fifth space EP5 is connected to the first space EP1 and the second space EP2.

[0035] According to the second embodiment, gas is discharged from the exhaust valves 111 of the energy storage cells 100 of the first energy storage module 10A and the second energy storage module 10B toward the fifth space EP5. The gas discharged into the fifth space EP5 passes through the first space EP1 and the second space EP2, and is then discharged to the outside of the accommodating case 20 from the case exhaust valves 211a to 211d. The gas discharged from the energy storage cells 100 can be discharged to the outside of the accommodating case 20 without forming many ventilation holes in the accommodating case 20. The gas flowing through the first space EP1 and the second space EP2 can be efficiently discharged to the outside of the accommodating case 20 from the case exhaust valves 211a to 211d, which are arranged at positions facing the first space EP1 or the second space EP2.

[0036] (Embodiment 3) Fig. 4 is a plan view of the electricity storage device according to the embodiment 3. In the embodiment 3, the configuration of the accommodating case 20 is the same as that in the embodiment 1. In Fig. 4, the UPR case 22 is not shown.

[0037] In the third embodiment, in the configuration of the second embodiment, a guide member 40 is provided that guides gas discharged from the energy storage cells 100 to the case exhaust valve 211. A guide member 40a and a guide member 40c are provided in the first space EP1. The guide member 40a is disposed adjacent to the first energy storage module 10A and guides gas from the center of the first space EP1 in the Y direction (the connection between the first space EP1 and the fifth space EP5) toward the case exhaust valve 211a. The guide member 40a is disposed adjacent to the first energy storage module 10A so that the passage cross-sectional area of ​​the first space EP1 gradually decreases from the end of the first energy storage module 10A in the +Y direction toward the -Y direction (toward the case exhaust valve 211a). This allows the gas flowing through the first space EP1 to be smoothly guided to the case exhaust valve 211a without stagnation.

[0038] The guide member 40c is disposed adjacent to the second power storage module 10B and guides gas from the center of the first space EP1 in the Y direction (the connection between the first space EP1 and the fifth space EP5) toward the case exhaust valve 211c. The guide member 40c is disposed adjacent to the second power storage module 10B so that the passage cross-sectional area of ​​the first space EP1 gradually decreases from the -Y direction end of the second power storage module 10B toward the +Y direction (toward the case exhaust valve 211c). This allows the gas flowing through the first space EP1 to be smoothly guided to the case exhaust valve 211c without stagnation.

[0039] Guide members 40b and 40d are provided in the second space EP2. Guide member 40b is disposed adjacent to the first power storage module 10A, and guide member 40d is disposed adjacent to the second power storage module 10B. Guide members 40b and 40d have the same configuration as guide members 40a and 40c, and gas flowing through second space EP2 is smoothly guided to case exhaust valves 211b and 211d without stagnation.

[0040] 4, the X-direction lengths (widths) of guide members 40a-40d are configured to increase toward case exhaust valves 211a-211d so that the passage cross-sectional area of ​​first space EP1 or second space EP2 gradually decreases toward case exhaust valves 211a-211d. However, the Z-direction lengths (heights) of guide members 40a-40d may be configured to increase toward case exhaust valves 211a-211d so that the passage cross-sectional area of ​​first space EP1 or second space EP2 gradually decreases toward case exhaust valves 211a-211d, allowing gas flowing through first space EP1 or second space EP2 to be smoothly guided to case exhaust valves 211a-211d without stagnation. Note that guide members 40a and 40c correspond to the "first guide members" in this disclosure, and guide members 40b and 40d correspond to the "second guide members" in this disclosure.

[0041] (Fourth embodiment) Fig. 5 is a plan view of the electricity storage device according to embodiment 4. In embodiment 4, the configuration of the accommodating case 20 is substantially the same as that in embodiment 1. In Fig. 5, the UPR case 22 is not shown.

[0042] In the fourth embodiment, the first energy storage module 10C and the second energy storage module 10D have a structure in which they are stacked in the X direction such that the first end faces 100a and the second end faces 100b of adjacent energy storage cells 100 are alternately arranged in the Y direction. In the first energy storage module 10C and the second energy storage module 10D, the external terminals 112 and external terminals 113 of adjacent energy storage cells 100 are connected by a bus bar. In the fourth embodiment, the first energy storage module 10C and the second energy storage module 10D have a plurality of energy storage cells 100 electrically connected in series.

[0043] The first power storage module 10C is arranged such that a third space EP3 is formed between it and the third side wall portion 20c. Exhaust valves 111 of some of the power storage cells 100 included in the first power storage module 10C face the third space EP3. The second power storage module 10D is arranged such that a fourth space EP4 is formed between it and the fourth side wall portion 20d. Exhaust valves 111 of some of the power storage cells 100 included in the second power storage module 10D face the fourth space EP4. The first power storage module 10C and the second power storage module 10D are arranged such that a fifth space EP5 is formed between the first power storage module 10C and the second power storage module 10D. Exhaust valves 111 of some of the power storage cells 100 included in the first power storage module 10C and the second power storage module 10D face the fifth space EP5.

[0044] A first space EP1 is formed between the first side wall portion 20a of the LWR case 21 and the first power storage module 10C, and between the first side wall portion 20a and the second power storage module 10D. A second space EP2 is formed between the second side wall portion 20b of the LWR case 21 and the first power storage module 10C, and between the second side wall portion 20b and the second power storage module 10D. The first space EP1 is a gap formed between the first power storage module 10C and the second power storage module 10D and the first side wall portion 20a. The second space EP2 is a gap formed between the first power storage module 10C and the second power storage module 10D and the second side wall portion 20b.

[0045] Similar to the first embodiment, case exhaust valves 211a and 211b are provided on the third side wall portion 20c of the LWR case 21. Similar to the first embodiment, case exhaust valves 211c and 211d are provided on the fourth side wall portion 20d.

[0046] Gas is discharged from the exhaust valves 111 of the energy storage cells 100 included in the first energy storage module 10C and the second energy storage module 10D toward the third space EP3, the fourth space EP4, and the fifth space EP5. As indicated by the two-dot chain arrows, these gases pass through the first space EP1 and the second space EP2 and are discharged to the outside of the accommodating case 20 from the case exhaust valves 211a to 211d. The gas discharged from the energy storage cells 100 can be discharged to the outside of the accommodating case 20 without forming many ventilation holes in the accommodating case 20.

[0047] As in the first embodiment, the case exhaust valves 211a and 211b are provided in the third side wall portion 20c at positions facing the first space EP1 and the second space EP2, respectively. The case exhaust valves 211c and 211d are provided in the fourth side wall portion 20d at positions facing the first space EP1 and the second space EP2, respectively. This allows gas flowing through the first space EP1 and the second space EP2 to be efficiently exhausted to the outside of the storage case 20 through the case exhaust valves 211a to 211d.

[0048] (Embodiment 5) Fig. 6 is a plan view of the electricity storage device according to the fifth embodiment. In the fifth embodiment, the configuration of the accommodating case 20 is the same as that in the fourth embodiment. In Fig. 6, the UPR case 22 is not shown.

[0049] In the fifth embodiment, in the configuration of the fourth embodiment, a guide member 41 is provided that guides gas discharged from the energy storage cells 100 toward the case exhaust valve 211. A guide member 41a and a guide member 41c are provided in the first space EP1. The guide member 41a is disposed adjacent to the first energy storage module 10C and guides gas from the Y-direction center of the first space EP1 (the connection between the first space EP1 and the fifth space EP5) toward the case exhaust valve 211a. The guide member 41a is disposed adjacent to the first energy storage module 10A so that the passage cross-sectional area of ​​the first space EP1 gradually decreases from the +Y-direction end of the first energy storage module 10C toward the -Y direction (toward the case exhaust valve 211a). Furthermore, the guide member 41a includes a guide portion that guides gas flowing through the third space EP3 from the +X-direction end of the first energy storage module 10C toward the case exhaust valve 211a. As a result, the gas flowing through the first space EP1 and the third space EP3 is smoothly guided to the case exhaust valve 211a without stagnating.

[0050] The guide member 41c is disposed adjacent to the second power storage module 10D and guides gas from the center of the first space EP1 in the Y direction (the connection between the first space EP1 and the fifth space EP5) toward the case exhaust valve 211c. The guide member 41c is disposed adjacent to the second power storage module 10B so that the passage cross-sectional area of ​​the first space EP1 gradually decreases from the -Y direction end of the second power storage module 10D toward the +Y direction (toward the case exhaust valve 211c). Furthermore, the guide member 41b has a guide portion that guides gas flowing through the fourth space EP4 from the +X direction end of the second power storage module 10D toward the case exhaust valve 211c. This allows gas flowing through the first space EP1 and the fourth space EP4 to be smoothly guided to the case exhaust valve 211c without stagnation.

[0051] Guide members 41b and 41d are provided in the second space EP2. Guide member 41b is disposed adjacent to the first power storage module 10C, and guide member 41d is disposed adjacent to the second power storage module 10D. Guide members 41b and 41d have the same configuration as guide members 41a and 41c, and gas flowing through the second space EP2, third space EP3, and fourth space EP4 is smoothly guided to the case exhaust valves 211b and 211d without stagnation.

[0052] 5, the lengths (widths) of the guide members 41a-41d in the X direction are configured to increase toward the case exhaust valves 211a-211d so that the passage cross-sectional area of ​​the first space EP1 or the second space EP2 gradually decreases toward the case exhaust valves 211a-211d. However, the lengths (heights) of the guide members 41a-41d in the Z direction may be configured to increase toward the case exhaust valves 211a-211d so that the passage cross-sectional area gradually decreases toward the case exhaust valves 211a-211d, and gas flowing through the first space EP1, the second space EP2, the third space EP3, and the fourth space EP4 is smoothly guided to the case exhaust valves 211a-211d without stagnation.

[0053] In each of the above-described embodiments, in addition to the first and second power storage modules, other components may be accommodated inside the accommodating case 20. The other components may be, for example, a cooling plate, a battery monitoring device, a battery control device, etc.

[0054] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is defined by the claims, not by the description of the above embodiments, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0055] 1 Energy storage device, 10 Energy storage module, 10A, 10C First energy storage module, 10B, 10D Second energy storage module, 20 Storage case, 20a First side wall portion, 20b Second side wall portion, 20c Third side wall portion, 20d Fourth side wall portion, 21 LWR case, 22 UPR case, 40, 41 Guide member, 100 Energy storage cell, 111 Exhaust valve, 211 Case exhaust valve, EP1 First space, EP2 Second space, EP3 Third space, EP4 Fourth space, EP5 Fifth space.

Claims

1. a first storage module including a first plurality of storage cells; a second storage module including a second plurality of storage cells; a housing case that houses the first power storage module and the second power storage module, the first power storage module and the second power storage module are arranged in a first direction; the storage case includes a first side wall portion located on one side in a second direction perpendicular to the first direction, and a second side wall portion located on the other side in the second direction, a first space is formed between the first side wall portion and the first and second power storage modules, a second space is formed between the first power storage module and the second side wall portion, and between the first power storage module and the second power storage module and the second side wall portion; the storage case is provided with a case exhaust valve that exhausts gas discharged from at least one of the first plurality of storage cells and the second plurality of storage cells to the outside of the storage case.

2. the storage case further includes a third side wall portion located on one side in the first direction and a fourth side wall portion located on the other side in the first direction, The case exhaust valve is a first case exhaust valve and a second case exhaust valve provided in the third side wall portion at positions facing the first space and the second space, respectively; The power storage device according to claim 1 , further comprising: a third case exhaust valve and a fourth case exhaust valve provided in the fourth side wall portion at positions facing the first space and the second space, respectively.

3. the first plurality of storage cells are arranged in the second direction, the second plurality of storage cells are arranged in the second direction, at least one of the first plurality of energy storage cells has an exhaust valve that discharges gas toward the second energy storage module; at least one of the second plurality of energy storage cells has an exhaust valve that discharges gas toward the first energy storage module; a first guide member that guides the gas from a center side in the first direction toward the first case exhaust valve and the third case exhaust valve is disposed in the first space adjacent to the first power storage module and the second power storage module; 3. The energy storage device according to claim 2, wherein a second guide member that guides the gas from a center side in the first direction toward the second case exhaust valve and the fourth case exhaust valve is arranged in the second space adjacent to the first energy storage module and the second energy storage module.

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