Power storage device and vehicle

Abstract

To make it possible to achieve both downsizing and appropriate gas discharge in a power storage device.SOLUTION: A power storage device includes: a case 10; and a power storage part 20 housed in the case 10. The case 10 has a first end (end part 11) and a second end (end part 12) facing each other in a first direction (X direction). A positive electrode terminal 11b electrically connected to a positive electrode of the power storage part 20 is provided at the first end part. A negative electrode terminal 12b electrically connected to a negative electrode of the power storage part 20 is provided at the second end part. At least one of the first end part and the second end part is provided respectively with gas discharge valves (gas discharge valves 30A and 30B) that, when opened, discharge a gas in the case 10 to the outside of the case 10.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a power storage device and a vehicle. [Background technology]

[0002] Japanese Patent Laid-Open Publication No. 2012-156489 (Patent Document 1) discloses an electricity storage device that includes a positive electrode terminal, a negative electrode terminal, and a gas release valve on the top surface of a case (exterior body). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-156489 Summary of the Invention [Problem to be solved by the invention]

[0004] The structure described in Patent Document 1 has a large amount of dead space (space that is not effectively used) in the electricity storage device, making it difficult to miniaturize the electricity storage device. Furthermore, a miniaturized electricity storage device can have a problem in that the internal pressure (pressure inside the case) is likely to increase.

[0005] The present disclosure has been made to solve the above-mentioned problems, and its purpose is to achieve both miniaturization and appropriate gas discharge in an electricity storage device. [Means for solving the problem]

[0006] According to a first aspect of the present disclosure, there is provided an electric storage device. The electric storage device includes a case and an electric storage unit housed in the case. The case has a first end and a second end facing each other in a first direction. The first end is provided with a positive electrode terminal electrically connected to a positive electrode of the electric storage unit. The second end is provided with a negative electrode terminal electrically connected to a negative electrode of the electric storage unit. At least one of the first end and the second end is provided with a gas exhaust valve that exhausts gas inside the case to the outside of the case when the valve is open.

[0007] According to a second aspect of the present disclosure, there is provided a vehicle including the above-described power storage device, wherein the gas exhaust valve is configured to exhaust gas from within the case vertically upward. [Effects of the Invention]

[0008] According to the present disclosure, it is possible to achieve both miniaturization and appropriate gas discharge in an electricity storage device. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a diagram illustrating a configuration of a power storage device according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Figure 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2. [Figure 4] 10A and 10B are diagrams for explaining the functions and effects achieved by the power storage device according to the present embodiment. [Figure 5] 1 is a diagram illustrating a vehicle according to an embodiment of the present disclosure. [Figure 6] 3 is a diagram showing a modified example of the gas discharge path shown in FIG. 2. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] 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 each of the drawings used below, of the mutually orthogonal X-axis, Y-axis, and Z-axis, the X-axis indicates a first in-plane direction of the battery (e.g., the length direction), the Y-axis indicates a second in-plane direction of the battery (e.g., the width direction), and the Z-axis indicates the height direction of the battery. Hereinafter, the directions indicated by the arrows of the X-axis, Y-axis, and Z-axis will be indicated with a "+" and the opposite directions will be indicated with a "-".

[0011] Fig. 1 is a diagram for explaining the configuration of the electricity storage device according to this embodiment. Fig. 2 is a cross-sectional view taken along line II-II in Fig. 1 (particularly, a view seen from the +Z side). Fig. 3 is a cross-sectional view taken along line III-III in Fig. 2.

[0012] The power storage device according to this embodiment is a battery 1. The battery 1 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 LFP batteries that use lithium iron phosphate as the positive electrode active material, and ternary batteries that use NMC (nickel-manganese-cobalt) as the positive electrode active material. However, the type of power storage device is arbitrary.

[0013] The battery 1 includes a case 10. The case 10 is formed in the shape of a rectangular parallelepiped elongated in the X direction. The case 10 has six ends 11 to 16 corresponding to the six faces of the rectangular parallelepiped. Specifically, the case 10 has ends 11 and 12 facing each other in the X direction, ends 13 and 14 facing each other in the Y direction, and ends 15 and 16 facing each other in the Z direction. In this embodiment, each of the ends 11 to 16 is a plate-like member, and adjacent ends are joined to form the case 10. However, this is not limited thereto, and two or more of the ends 11 to 16 may be integrated. For example, the integrated ends 13 to 16 may be formed by a cylindrical member, and the ends 11 and 12 may be joined to both ends of the cylindrical member. In this embodiment, the X direction, the Z direction, the end 11, and the end 12 are examples of the "first direction," "second direction," "first end," and "second end" according to the present disclosure, respectively.

[0014] In the example shown in FIG. 1, the length of case 10 (dimension in the X direction) is longer than the width of case 10 (dimension in the Y direction). The length of case 10 may be 200 mm or more and 5000 mm or less, for example, approximately 1000 mm. The width of case 10 may be 5 mm or more and 100 mm or less, for example, approximately 50 mm. The height of case 10 (dimension in the Z direction) may be 50 mm or more and 300 mm or less, for example, approximately 100 mm. The ratio of the length of case 10 to the height of case 10 may be 4 or more and 25 or less. However, the dimensions of case 10 are not limited to those described above.

[0015] As shown in FIGS. 2 and 3, the battery 1 further includes a power storage unit 20 housed in a case 10. A positive electrode terminal 11b electrically connected to the positive electrode of the power storage unit 20 is provided at the end 11 on the +X side. A negative electrode terminal 12b electrically connected to the negative electrode of the power storage unit 20 is provided at the end 12 on the −X side. As shown in FIG. 3, the power storage unit 20 includes a plurality of positive electrode sheets 21 and a plurality of negative electrode sheets 22. Specifically, the power storage unit 20 is formed by alternately stacking the positive electrode sheets 21 and the negative electrode sheets 22. That is, the power storage unit 20 has a portion where the positive electrode sheets 21 and the negative electrode sheets 22 are alternately stacked. A separator may be disposed between the positive electrode sheets 21 and the negative electrode sheets 22. The separator may be a porous sheet. The number of electrode sheets in the power storage unit 20 may be 3 or more and less than 50, or 50 or more. The power storage unit 20 is not limited to a laminate in which a plurality of electrode sheets are stacked in one direction, but may also be a wound body (for example, a wound body in which a laminate of alternatingly arranged positive electrode sheets and negative electrode sheets is wound).

[0016] As shown in Fig. 3, the battery 1 further includes a positive electrode current collector tab 11c and a negative electrode current collector tab 12c. Each of the positive electrode current collector tab 11c and the negative electrode current collector tab 12c is an assembly of multiple tabs (e.g., a tab bundle). Each tab outputs the potential of the electrode sheet (positive electrode sheet 21 or negative electrode sheet 22). The electrode sheets and the tabs may be formed separately and then joined together, or may be formed seamlessly and integrally.

[0017] The positive electrode current collector tab 11c is electrically connected to each of the multiple positive electrode sheets 21 included in the power storage unit 20, and is also electrically connected to the positive electrode terminal 11b. That is, the positive electrode terminal 11b is electrically connected to the positive electrode of the power storage unit 20 via the positive electrode current collector tab 11c. The positive electrode current collector tab 11c and the positive electrode terminal 11b may be joined (for example, welded). The positive electrode terminal 11b has a portion that is connected to the positive electrode current collector tab 11c inside the case 10, a portion that penetrates the end portion 11 in the X direction, and a portion that functions as an external terminal (positive electrode terminal) outside the case 10. A through hole for the positive electrode terminal 11b is formed in the end portion 11. The positive electrode terminal 11b may be an integrally molded product, or may be a composite in which multiple separately molded members are joined together.

[0018] The negative electrode current collector tab 12c is electrically connected to each of the multiple negative electrode sheets 22 included in the power storage unit 20, and is also electrically connected to the negative electrode terminal 12b. That is, the negative electrode terminal 12b is electrically connected to the negative electrode of the power storage unit 20 via the negative electrode current collector tab 12c. The negative electrode current collector tab 12c and the negative electrode terminal 12b may be joined (for example, welded). The negative electrode terminal 12b has a portion that is connected to the negative electrode current collector tab 12c inside the case 10, a portion that penetrates the end portion 12 in the X direction, and a portion that functions as an external terminal (negative electrode terminal) outside the case 10. A through-hole for the negative electrode terminal 12b is formed in the end portion 12. The negative electrode terminal 12b may be an integrally molded product, or may be a composite in which multiple separately molded members are joined together.

[0019] The case 10 further contains an electrolytic solution 40. The electrolytic solution 40 may be poured into the case 10 through a pouring port (not shown) provided in the case 10. The pouring port may be closed after the electrolytic solution 40 is poured. The sealed space in the case 10 may be filled with the electrolytic solution 40. The electrolytic solution 40 may be impregnated into a separator.

[0020] The positive electrode sheet 21 includes, for example, a positive electrode current collector and a positive electrode active material layer. The negative electrode sheet 22 includes, for example, a negative electrode current collector and a negative electrode active material layer. The electrode sheets may be formed by applying an active material to the surface of a metal foil that serves as a current collector. In one example, the positive electrode current collector is aluminum foil, the positive electrode active material is olivine-type lithium iron phosphate (LiFePO4), the negative electrode current collector is copper foil, the negative electrode active material is a carbon-based material (e.g., graphite), and the electrolyte 40 is a non-aqueous electrolyte (e.g., an ester-based electrolyte). However, these materials can be changed as appropriate. Other examples of the positive electrode active material include composite oxides (e.g., LiCoO2, LiNiMnCoO2) containing lithium and one or more elements selected from the group consisting of manganese, titanium, nickel, cobalt, and aluminum. Other examples of the negative electrode active material include silicon and tin. The electrolyte 40 may be an aqueous electrolyte.

[0021] 2, the battery 1 further includes a gas release valve 30A (first gas release valve) provided at an end 11 of the case 10, a gas permeable member 41 (first gas permeable member) arranged between the power storage unit 20 and the gas release valve 30A, a gas release valve 30B (second gas release valve) provided at an end 12 of the case 10, and a gas permeable member 42 (second gas permeable member) arranged between the power storage unit 20 and the gas release valve 30B. In this embodiment, the gas release valves 30A and 30B have the same configuration, and therefore, hereinafter, when there is no need to distinguish between them, they will be referred to as "gas release valve 30."

[0022] The gas exhaust valve 30 is configured to exhaust gas inside the case 10 to the outside of the case 10 when the valve is open. The gas exhaust valve 30 includes a valve body 31, a vent member 32, a biasing member 33, and a cover member 34. The valve body 31 is formed, for example, in a plate shape. The biasing member 33 is, for example, a coil spring. However, the type of biasing member is arbitrary, and other biasing members (such as a plate-shaped spring or an elastic body) can also be used.

[0023] A part of the vent member 32 (more specifically, a valve seat portion P1 described below) is located between the valve body 31 and the electricity storage unit 20. The biasing member 33 biases the valve body 31 toward the vent member 32. One end of the biasing member 33 is fixed to the cover member 34, and the other end of the biasing member 33 applies a biasing force in the X direction to the valve body 31 (more specifically, a force toward the inside of the case 10). The biasing force of the biasing member 33 brings the valve body 31 into contact with the vent member 32, thereby closing the gas release valve 30. On the other hand, when the pressure inside the case 10 exceeds a predetermined reference value, the valve body 31, receiving the pressure, moves away from the vent member 32 against the biasing force, thereby opening the gas release valve 30.

[0024] The gas release valve 30A is provided inside the end portion 11. A space (accommodation section) for accommodating the gas release valve 30A is formed in the end portion 11, and the gas release valve 30A is disposed in the accommodation section. The gas release valve 30A is located on the +Z side of the positive electrode terminal 11b. The ventilation member 32 of the gas release valve 30A includes a valve seat section P1 having a plurality of ventilation holes formed therein and a support section P2 extending from the valve seat section P1 toward the lid member 34 (+X side). In the gas release valve 30A, the support section P2 of the ventilation member 32 is connected to the end portion 11 via the lid member 34. These may be connected by any method, such as welding or by adhesive. A gas release path 11a is formed in the end portion 11. In the gas release valve 30A, a vent hole P3 is formed in the cover member 34 so that, when the gas release valve 30A is open, gas that has entered the inside of the gas release valve 30A from the inside of the case 10 through the vent holes in the valve seat P1 flows into the gas release channel 11a. The gas release channel 11a extends in the Z direction. When the gas release valve 30A is open, gas inside the case 10 passes through the gas release channel 11a in the end portion 11 and is released to the outside of the case 10 toward the +Z side. On the other hand, when the gas release valve 30A is closed, the valve element 31 receives a force toward the -X side from the biasing member 33 and comes into contact with the valve seat P1. This blocks the vent holes in the valve seat P1, and gas is no longer released through the gas release channel 11a.

[0025] The gas release valve 30B is provided inside the end portion 12. A space (accommodation section) for accommodating the gas release valve 30B is formed in the end portion 12, and the gas release valve 30B is disposed in the accommodation section. The gas release valve 30B is located on the +Z side of the negative electrode terminal 12b. The ventilation member 32 of the gas release valve 30B includes a valve seat section P1 having a plurality of ventilation holes formed therein and a support section P2 extending from the valve seat section P1 toward the lid member 34 (-X side). In the gas release valve 30B, the support section P2 of the ventilation member 32 is connected to the end portion 12 via the lid member 34. These may be connected by any method, such as by welding or by adhesive. A gas release path 12a is formed in the end portion 12. In the gas release valve 30B, a vent hole P3 is formed in the cover member 34 so that, when the gas release valve 30B is open, gas that has entered the inside of the case 10 through the vent holes in the valve seat P1 flows into the gas release channel 12a. The gas release channel 12a extends in the Z direction. When the gas release valve 30B is open, gas inside the case 10 passes through the gas release channel 12a in the end portion 12 and is released toward the +Z side to the outside of the case 10. On the other hand, when the gas release valve 30B is closed, the valve element 31 receives a force toward the +X side from the biasing member 33 and comes into contact with the valve seat P1. This blocks the vent holes in the valve seat P1, and gas is no longer released through the gas release channel 12a.

[0026] As described above, by providing gas exhaust valves (gas exhaust valves 30A, 30B) at both the first end (end 11) where the positive electrode terminal is provided and the second end (end 12) where the negative electrode terminal is provided, it becomes easier to properly exhaust gas inside the case 10 (for example, gas generated near the electrodes of the storage unit 20) to the outside of the case 10.

[0027] In the gas release valve 30A, a gas permeable member 41 is attached to the surface (the surface on the -X side) of the valve seat P1 of the ventilation member 32 so as to cover all of the vent holes provided in the valve seat P1. The gas permeable member 41 is configured to prevent liquid (e.g., the electrolyte 40) in the case 10 from flowing toward the gas release valve 30A, while allowing gas (vapor) in the case 10 to flow toward the gas release valve 30A. In the gas release valve 30B, a gas permeable member 42 is attached to the surface (the surface on the +X side) of the valve seat P1 so as to cover all of the vent holes provided in the valve seat P1 of the ventilation member 32. The gas permeable member 42 is configured to prevent liquid (e.g., the electrolyte 40) in the case 10 from flowing toward the gas release valve 30B, while allowing gas (vapor) in the case 10 to flow toward the gas release valve 30B. The gas-permeable members 41, 42 make it possible to selectively guide only the gas (gas) out of the liquid and gas (vapor) inside the case 10 to the gas release valves 30A, 30B. The gas-permeable members 41, 42 prevent the movement of the liquid from inside the case 10 to the gas release valves 30A, 30B. This makes it less likely for liquid to leak.

[0028] The gas-permeable members 41 and 42 may be water-repellent and gas-permeable membrane materials. Each of the gas-permeable members 41 and 42 may be a nonwoven fabric containing at least one of polyethylene and polypropylene. A specific example of each of the gas-permeable members 41 and 42 is Gore-Tex (registered trademark), which is a composite of a stretched polytetrafluoroethylene film and a polyurethane polymer.

[0029] Fig. 4 is a diagram for explaining the functions and effects achieved by the above-described battery 1. As in the reference example in Fig. 4, a battery 80 in which a positive electrode terminal 81, a negative electrode terminal 82, and a gas release valve 83 are all provided at the end on the +Z side has a large amount of dead space (space that is not effectively used). Specifically, in the battery 80, dead spaces R31 to R33 are generated near the current collectors, and dead spaces R41 and R42 are generated near the tabs.

[0030] In contrast, in the battery 1 (example) according to this embodiment, of the end portions 11 and 12 of the case 10 facing each other in the X direction, a positive terminal 11b electrically connected to the positive electrode of the power storage unit 20 is provided at the end portion 11 on the +X side, and a negative terminal 12b electrically connected to the negative electrode of the power storage unit 20 is provided at the end portion 12 on the −X side (see FIGS. 1 to 3 ). In this way, by arranging terminals (positive or negative terminals) at both opposing ends of the case 10, it becomes easier to reduce the dead space. Specifically, as shown in FIG. 4 , the dead space in the battery 1 is comprised of dead spaces R11 and R12 near the current collectors and dead spaces R21 and R22 near the tabs, which are smaller than the dead space in the battery 80.

[0031] Reducing the dead space as described above makes it easier to miniaturize the battery. However, a miniaturized battery can have a problem in that the internal pressure (pressure inside the case) is more likely to increase. In this regard, the battery 1 is provided with a gas exhaust valve (gas exhaust valve 30A or 30B) at each of the end portions 11 and 12, which exhausts gas inside the case 10 to the outside of the case 10 when the valve is open (see FIG. 2). This makes it easier to properly exhaust gas inside the case 10 (e.g., gas generated in the power storage unit 20) to the outside of the case 10. The above configuration achieves both miniaturization and proper gas exhaust in a power storage device (e.g., a battery).

[0032] Moreover, in the battery 1, the gas release valves 30A and 30B are disposed in spaces that tend to become dead spaces. Specifically, the gas release valve 30A is located in the Z direction of the positive electrode terminal 11b, and the gas release valve 30B is located in the Z direction of the negative electrode terminal 12b. By arranging the gas release valves in this manner, it is possible to reduce the dead spaces. The battery 1 has a high energy density and excellent pressure resistance.

[0033] FIG. 5 is a diagram showing an example of a vehicle equipped with a battery 1 according to this embodiment. The vehicle 2000 shown in FIG. 5 includes a battery pack 1000. The battery pack 1000 may be installed either above or below the floor of the vehicle 2000. The battery pack 1000 includes a plurality of power storage modules 100 and functions as a power storage device. Each of the plurality of power storage modules 100 includes a plurality of batteries 1. The vehicle 2000 is, for example, an electric vehicle configured to be able to run using power output from the battery pack 1000. The battery pack 1000 may supply power to a traction motor installed in the vehicle 2000.

[0034] FIG. 5 shows the up-down direction, the front-back direction, and the left-right direction, which are perpendicular to one another. "Down" corresponds to the vertically downward direction (the direction of gravity), and "up" corresponds to the vertically upward direction. In the energy storage module 100, multiple batteries 1 (see FIGS. 1 to 3) are arranged so that the +Z side surface of each battery faces upward and the -Z side surface of each battery faces downward. In the energy storage module 100, all of the batteries 1 may face the same direction, or they may not face the same direction in the front-back or left-right directions. Multiple batteries 1 may be connected in series or in parallel. In the battery pack 1000, the energy storage modules 100 are electrically connected to each other, for example, via a bus bar. The battery pack 1000 may include 100 or more batteries 1.

[0035] In the vehicle 2000, the gas release valves 30A and 30B of each of the multiple batteries 1 are configured to release gas vertically upward from the case 10. For example, when an impact is applied to the vehicle 2000 (and thus the battery pack 1000), gas is released vertically upward from the battery 1 whose internal pressure has increased. The bottom surface (vertically downward surface) of each of the multiple batteries 1 may be used as an installation surface, and a duct may be provided on the opposite side (above) to guide the gas released from each of the multiple batteries 1 to a predetermined location.

[0036] In the above embodiment, gas exhaust channels 11a and 12a are formed in the Z direction at the ends 11 and 12 of the case 10 that face each other in the X direction. However, this is not limited to this, and a gas exhaust channel in the X direction may be formed at each of the ends 11 and 12. FIG. 6 shows a modification of the gas exhaust channel shown in FIG. 2. As shown in FIG. 6, in this modification, gas exhaust channels 11e and 12e are formed in the X direction at the ends 11 and 12 of the case 10 that face each other in the X direction. The gas exhaust channel 11e is formed to penetrate the end 11 in the X direction. When the gas exhaust valve 30A is opened, gas inside the case 10 passes through the gas exhaust channel 11e in the end 11 and is exhausted to the outside of the case 10 toward the +X side. The gas exhaust channel 12e is formed to penetrate the end 12 in the X direction. When the gas exhaust valve 30B is opened, gas inside the case 10 passes through the gas exhaust channel 12e in the end 12 and is exhausted to the outside of the case 10 toward the -X side.

[0037] It is not essential that the gas exhaust valve 30A (first gas exhaust valve) and the gas exhaust valve 30B (second gas exhaust valve) have the same configuration, and they may have different configurations. It is also not essential that both the gas exhaust valves 30A and 30B are provided, and one of the gas exhaust valves 30A and 30B may be omitted.

[0038] The above-described power storage device (battery 1 and its modified examples) may be mounted on a mobile body other than an automobile. Examples of such mobile bodies include ships, airplanes, railroad cars, mobile machines (agricultural machines, construction machines, etc.), and unmanned mobile bodies (automated guided vehicles, robots, etc.). However, the power storage device may be used for any purpose, and may be for stationary use. The power storage device may also be applied to devices other than mobile bodies.

[0039] The various features of the power storage device described above (the features described in the embodiments and modifications) may be implemented in any combination.

[0040] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present disclosure 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]

[0041] 1 battery, 10 case, 11-16 ends, 11a, 11e, 12a, 12e gas exhaust path, 11b positive electrode terminal, 11c positive electrode current collecting tab, 12b negative electrode terminal, 12c negative electrode current collecting tab, 20 power storage section, 21 positive electrode sheet, 22 negative electrode sheet, 30A, 30B gas exhaust valve, 40 electrolyte, 41, 42 gas permeable member, 2000 vehicle.

Claims

1. A power storage device including a case and a power storage unit housed in the case, the case has a first end and a second end facing each other in a first direction; a positive electrode terminal electrically connected to a positive electrode of the power storage unit is provided at the first end, a negative electrode terminal electrically connected to a negative electrode of the power storage unit is provided at the second end, At least one of the first end and the second end is provided with a gas exhaust valve that, when open, exhausts gas inside the case to the outside of the case.

2. the gas exhaust valve includes a first gas exhaust valve provided at the first end and a second gas exhaust valve provided at the second end, The power storage device is a first gas permeable member that is disposed between the power storage unit and the first gas release valve and that prevents liquid in the case from flowing toward the first gas release valve while allowing gas in the case to flow toward the first gas release valve; a second gas permeable member that is disposed between the power storage unit and the second gas release valve and that prevents liquid in the case from flowing toward the second gas release valve while allowing gas in the case to flow toward the second gas release valve; The power storage device according to claim 1 , further comprising:

3. the first gas exhaust valve is located in a second direction perpendicular to the first direction of the positive electrode terminal, The power storage device according to claim 2 , wherein the second gas release valve is located in the second direction of the negative electrode terminal.

4. The case is formed in a rectangular parallelepiped shape that is elongated in the first direction, The case further contains an electrolyte; the electricity storage unit has a plurality of positive electrode sheets and a plurality of negative electrode sheets, the electricity storage unit has a portion where the positive electrode sheets and the negative electrode sheets are alternately stacked, The power storage device is a positive electrode current collecting tab electrically connected to each of the plurality of positive electrode sheets and electrically connected to the positive electrode terminal; a negative electrode current collecting tab electrically connected to each of the plurality of negative electrode sheets and electrically connected to the negative electrode terminal; The power storage device according to claim 1 , further comprising:

5. A vehicle equipped with the power storage device according to any one of claims 1 to 4, The vehicle, wherein the gas exhaust valve is configured to exhaust gas from within the case vertically upward.

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