Power storage device and vehicle

Abstract

To provide a power storage device which is mounted with battery cells each having a sulfide solid electrolyte and can detect a sulfide gas with high sensitivity, and to provide a vehicle.SOLUTION: A power storage device 1 includes: battery cells 25 each having a sulfide solid electrolyte; a case 20 that accommodates the battery cells 25; and at least one gas collection unit 70, 71 that is disposed in the case 20 and that detects hydrogen sulfide. A protruding portion 68 is formed on a bottom surface 63 of an inner surface of the case 20, and the gas collection units 70, 71 are disposed in the protruding portion 68.SELECTED DRAWING: Figure 4

Description

[Technical field]

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

[0002] Various proposals have been made on electricity storage devices equipped with all-solid-state batteries, and the electricity storage device described in JP 2022-12308 A is equipped with a sulfide sensor. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2022-12308 Summary of the Invention [Problem to be solved by the invention]

[0004] In the electricity storage device described in JP 2022-12308 A, there is no mention of how to specifically arrange the sulfide sensor.

[0005] As a result, even if sulfide gas is generated in an all-solid-state battery, depending on the mounting position of the sulfide sensor, the generation of sulfide gas may not be detected satisfactorily.

[0006] The present disclosure has been made in consideration of the above-mentioned problems, and an object of the present disclosure is to provide an energy storage device and a vehicle that are capable of effectively capturing sulfide gas in an energy storage device equipped with a battery cell having a sulfide solid electrolyte. [Means for solving the problem]

[0007] The power storage device according to the present disclosure includes a battery cell having a sulfide solid electrolyte, a case for accommodating the battery cell, and at least one gas collector disposed in the case for detecting hydrogen sulfide, the case having an inner surface formed with a protruding portion protruding from the inner surface of the case toward the outside of the case, the gas collector being disposed on the protruding portion, and the gas collector being a gas detection sensor.

[0008] The gas collection sections are provided in multiple locations, and if the direction in which the protrusion section protrudes from the inner surface of the case toward the outside of the case is defined as the protrusion direction, the multiple gas collection sections are arranged so that their protrusion direction positions are different within the protrusion section.

[0009] The inner surface of the case includes a mounting surface on which the battery cells are placed, and the protruding portion is formed to protrude outward from the case beyond the mounting surface.

[0010] The case includes a bottom plate, and the protruding portion is a groove portion formed by deforming the bottom plate so that it protrudes toward the outside of the case. A vehicle equipped with the above-described power storage device, in which the power storage device is mounted on the vehicle so that the protruding portion protrudes downward. The case includes a bottom plate, and the protruding portion is a groove portion formed by deforming the bottom plate so that it protrudes downward, and the groove portion is formed to extend in the front-rear direction of the vehicle.

[0011] The case includes a bottom plate, and the protruding portion is a groove portion formed by deforming the bottom plate so that it protrudes downward, and the groove portion is formed so as to extend in the width direction of the vehicle. Effect of the Invention

[0012] According to the electricity storage device and vehicle according to the present disclosure, in an electricity storage device equipped with battery cells having a sulfide solid electrolyte, sulfide gas can be effectively captured. [Brief description of the drawings]

[0013] [Figure 1]FIG. 1 is a schematic diagram showing a vehicle 2 equipped with an electricity storage device 1 according to the present embodiment. [Diagram 2] FIG. 1 is a perspective view showing an electricity storage device 1. [Diagram 3] 2 is a perspective view showing a schematic view of the case 20 with the upper case 31 removed. FIG. [Figure 4] FIG. 1 is a cross-sectional view showing an electricity storage device 1. [Diagram 5] FIG. 2 is a plan view showing a schematic view of a battery cell 25. [Figure 6] 2 is a cross-sectional view showing a battery cell 25. FIG. [Figure 7] 4 is a flow chart showing an example of abnormality processing control executed by the control device 11. FIG. [Figure 8] 2 is a perspective view that shows a schematic diagram of an electricity storage device 1A with an upper case 31 removed. FIG. [Figure 9] 2 is a cross-sectional view showing a groove 80 and the surrounding structure. FIG. [Figure 10] 2 is a perspective view that shows a schematic diagram of an electricity storage device 1B with an upper case 31 removed. FIG. [Figure 11] 1 is a cross-sectional view showing a configuration of a groove 82, a groove 83 and their surroundings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] A power storage device 1 according to this embodiment will be described with reference to Figures 1 to 11. Among the configurations shown in Figures 1 to 11, the same or substantially the same configurations are denoted by the same reference numerals and duplicated description will be omitted.

[0015] 1 is a schematic diagram showing a vehicle 2 equipped with a power storage device 1 according to the present embodiment. The vehicle 2 is an electric vehicle (BEV) that does not have an engine (internal combustion engine), but may also be a hybrid vehicle (HEV) that has an engine, or a plug-in hybrid vehicle (PHEV).

[0016] The vehicle 2 includes an electricity storage device 1, a drive device 10, a control device 11, an HMI (Human Machine Interface) device 12, and drive wheels 13.

[0017] The drive device 10 is connected to the power storage device 1. The drive device 10 includes, for example, a PCU and a rotating electric machine. The drive device 10 generates a drive force for driving the drive wheels 13 by using the electric power supplied from the power storage device 1. The control device 11 controls the drive of the drive device 10, the HMI device 12, etc. The control device 11 includes a processor 15, a storage device 16, and a RAM 17.

[0018] HMI device 12 includes an input unit into which various information is input by a user, and a display unit that displays various information. HMI device 12 is, for example, a touch panel display. Power storage device 1 is disposed, for example, on the underside of a floor panel of vehicle 2. Note that power storage device 1 may be disposed inside vehicle 2.

[0019] Fig. 2 is a perspective view showing the electricity storage device 1. In Fig. 2 and other figures, "W" indicates the width direction of the vehicle 2, "L" indicates the front-rear direction of the vehicle 2, and "H" indicates the up-down direction.

[0020] The electricity storage device 1 includes a case 20, battery modules 21 and 22, and a desulfurization unit 23. The case 20 includes a lower case 30 and an upper case 31. The lower case 30 has an opening that opens upward, and the upper case 31 is disposed so as to close the opening of the lower case 30.

[0021] 3 is a perspective view showing a schematic view of case 20 with upper case 31 removed. Lower case 30 includes a bottom plate 60 and a peripheral wall 61. Peripheral wall 61 is formed to extend upward from the outer periphery of bottom plate 60, and peripheral wall 61 is formed in an annular shape.

[0022] The inner surface 62 of the lower case 30 includes a bottom surface 63. The bottom surface 63 is formed with a general surface 64 and a protruding surface 65. The general surface 64 includes a mounting surface 66 and a mounting surface 67. The battery module 21 is disposed on the mounting surface 66, and the battery module 22 is disposed on the mounting surface 67.

[0023] A recess 68 extending downward is formed in the bottom plate 60. The recess 68 corresponds to the "projection" in this disclosure. The projecting surface 65 is the inner surface of the recess 68.

[0024] The recess 68 is formed so as to protrude from the inner surface 62 towards the outside of the case 20. Accordingly, the protruding surface 65 is also formed so as to protrude from the inner surface 62 towards the outside of the case 20.

[0025] In addition, in a state in which the power storage device 1 is mounted on the power storage device 1, the recess 68 is formed so as to protrude downward, and the protruding surface 65 is also formed so that the recess 68 protrudes downward.

[0026] The recess 68 extends downward from the general surface 64, and the protruding surface 65 is located below the general surface 64. For example, the protruding surface 65 is located below the mounting surfaces 66, 67.

[0027] The recess 68 is located between the mounting surface 66 and the mounting surface 67. However, the position of the recess 68 is not limited to this position.

[0028] Fig. 4 is a cross-sectional view showing the electricity storage device 1 taken along line IV-IV shown in Fig. 2. The recess 68 is formed by bending the bottom plate 60. The electricity storage device 1 includes gas detection sensors 70, 71 disposed in the recess 68. The gas detection sensors 70, 71 capture hydrogen sulfide gas when detecting hydrogen sulfide gas, and are an example of a "gas collector" of the present disclosure. The gas collector may be a sulfide gas absorbent or the like.

[0029] The gas detection sensors 70 and 71 are, for example, hydrogen sulfide sensors. The gas detection sensors 70 and 71 are sensors that detect the concentration of hydrogen sulfide (H2S) contained in the atmosphere, and the hydrogen sulfide sensor may be, for example, a hot wire semiconductor sensor or a constant potential electrolysis sensor.

[0030] Gas detection sensor 70 and gas detection sensor 71 differ in the position of the protruding direction in which recess 68 protrudes outward from case 20. When power storage device 1 is mounted on vehicle 2, gas detection sensor 70 and gas detection sensor 71 differ in the position in the up-down direction. Specifically, gas detection sensor 71 is located higher than gas detection sensor 70. Gas detection sensors 70 and 71 transmit signals indicating the detection results to control device 11.

[0031] In the example shown in FIG. 4, the recess 68 is formed by deforming a part of the bottom plate 60 so as to protrude downward. As a result, a bulge 72 is formed on the lower surface of the bottom plate 60 so as to protrude downward. As a method for forming the recess 68, for example, the thickness of the bottom plate 60 may be reduced to form the recess 68. When the thickness of the bottom plate 60 is reduced to form the recess 68, the lower surface of the bottom plate 60 can be made flat. As a result, when the power storage device 1 is disposed inside the vehicle 2, the mountability of the power storage device 1 can be improved.

[0032] The upper case 31 includes a top plate 32 and a peripheral wall 33. The peripheral wall 33 is formed to extend downward from the outer periphery of the top plate 32. The peripheral wall 33 is fixed to the lower case 30. The desulfurization unit 23 is disposed in the case 20. The desulfurization unit 23 is connected to the top plate 32.

[0033] The desulfurization unit 23 includes breathing membranes 35 and 36, a duct 37, and a desulfurization agent 38. An opening 39 is formed in the top plate 32, and the breathing membrane 35 is provided so as to close the opening 39.

[0034] The duct 37 includes a pipe portion 40, a pipe portion 41, and a pipe portion 42. The pipe portion 40 extends downward from the opening 39. The pipe portion 41 is disposed at the lower end of the pipe portion 40, and the pipe portion 41 is formed so as to extend in the horizontal direction. The pipe portion 42 is connected to the end of the pipe portion 41, and the pipe portion 42 is formed so as to extend upward. The breathing membrane 36 is provided so as to close the opening formed at the end of the pipe portion 42.

[0035] The breathable membranes 35, 36 are, for example, air-proof (moisture-permeable waterproof) sheets, such as GORE-TEX (registered trademark).

[0036] The desulfurizing agent 38 may be, for example, a pellet-shaped desulfurizing agent mainly composed of iron oxide, and chemically adsorbs hydrogen sulfide. The desulfurizing agent 38 is provided inside the duct 37.

[0037] The battery module 21 includes a plurality of battery cells 25 arranged in one direction, end plates 26, 27, and fixing members 28, 29.

[0038] End plate 26 is provided at one end of battery module 21, and end plate 27 is provided at the other end of battery module 21. End plate 26 and end plate 27 are connected by a restraining band (not shown). Multiple battery cells 25 are fixed between end plate 26 and end plate 27 by the restraining force from the restraining band. Fixing member 28 fixes end plate 26 to case 20, and fixing member 29 fixes end plate 27 to case 20. Battery module 22 is configured similarly to battery module 21.

[0039] 5 is a plan view that illustrates a schematic diagram of the battery cell 25. The battery cell 25 includes a laminate film 45, an electrode body 46, a positive electrode tab 47, and a negative electrode tab 48.

[0040] The electrode body 46 is sealed in the laminate film 45. A positive electrode tab 47 and a negative electrode tab 48 are connected to the electrode body 46, and are pulled out from the inside of the laminate film 45 to the outside.

[0041] 6 is a cross-sectional view showing a battery cell 25. The electrode body 46 includes a plurality of unit batteries 55. Each unit battery 55 includes a negative electrode current collector layer 50, a negative electrode active material layer 51, a solid electrolyte layer 52, a positive electrode active material layer 53, and a positive electrode current collector layer 54.

[0042] In the present disclosure, the solid electrolyte layer 52 contains a sulfur component. In the present embodiment, the solid electrolyte layer 52 includes a sulfide-based solid electrolyte, and for example, the sulfide-based solid electrolyte may be one that uses phosphorus pentasulfide (P2S5) or lithium sulfide (Li2S) as a starting material.

[0043] The positive electrode active material layer 53 may include a sulfide-based solid electrolyte. For example, the positive electrode active material layer 53 may include a sulfide-based solid electrolyte and, for example, lithium cobalt oxide, lithium nickel oxide, lithium iron phosphate, or the like.

[0044] When the solid electrolyte layer 52 is made of an oxide-based solid electrolyte, a sulfur-based positive electrode active material is used for the positive electrode active material layer 53. The sulfur-based positive electrode active material may be an organic sulfur compound or an inorganic sulfur compound. Both the solid electrolyte layer 52 and the positive electrode active material layer 53 may contain a sulfur component.

[0045] The negative electrode active material layer 51 may contain a sulfide-based solid electrolyte. The negative electrode active material layer 51 contains a sulfide-based solid electrolyte, a metal active material, and a carbon active material.

[0046] Examples of metal active materials include In, Al, Si, and Sn, while examples of carbon active materials include mesocarbon microbeads (MCMB), highly oriented graphite (HOPG), hard carbon, and soft carbon.

[0047] In the power storage device 1 configured as described above, charging and discharging are repeated. During this process, hydrogen sulfide gas may be generated inside the battery cells 25.

[0048] For example, in FIG. 5, a gap may occur in the portion where the positive electrode tab 47 and the negative electrode tab 48 are pulled out from the laminate film 45, and air may enter the laminate film 45 through this gap. Then, the solid electrolyte layer 52 may react with water in the air, generating hydrogen sulfide gas. Thus, when the cause is seal-out, the amount of hydrogen or sulfur gas generated is relatively small.

[0049] On the other hand, for example, an internal short circuit may occur within the electrode body 46, causing the electrode body 46 to reach a high temperature and generating hydrogen sulfide gas. The amount of hydrogen sulfide generated by an internal short circuit is greater than the amount of hydrogen sulfide generated by a seal out.

[0050] When hydrogen sulfide generated from battery modules 21, 22 reaches recessed portion 68, gas detection sensors 70, 71 can detect hydrogen sulfide. Hydrogen sulfide gas has a higher specific gravity than air, and therefore accumulates on bottom surface 63 of case 20 in FIG. 4. In particular, since recessed portion 68 is formed so as to extend downward from general surface 64, the generated hydrogen sulfide gas tends to accumulate in recessed portion 68.

[0051] Since the gas detection sensors 70, 71 are disposed in the recess 68, when hydrogen sulfide gas is generated, the gas detection sensors 70, 71 can detect the hydrogen sulfide gas well.

[0052] 3, recess 68 is disposed between mounting surface 66 and mounting surface 67. Therefore, gas detection sensors 70 and 71 can effectively detect both hydrogen sulfide gas generated from battery module 21 and hydrogen sulfide gas generated from battery module 22 shown in FIG.

[0053] 4, when hydrogen sulfide gas is generated in the case 20 and the internal pressure of the case 20 rises, the gas in the case 20 passes through the breathing membrane 36, the duct 37, and the breathing membrane 35 and is discharged to the outside of the case 20. When the gas in the case 20 passes through the duct 37, the hydrogen sulfide in the gas is adsorbed by the desulfurizing agent 38. This makes it possible to suppress the hydrogen sulfide gas from being discharged to the outside of the case 20.

[0054] In the electricity storage device 1 according to this embodiment, abnormality processing control is carried out based on signals output from the gas detection sensors 70 and 71 to the control device 11.

[0055] Fig. 7 is a flow diagram showing an example of abnormality processing control executed by the control device 11. The control flow shown in Fig. 7 is continuously and repeatedly executed.

[0056] The control device 11 receives signals from the gas detection sensors 70 and 71. Based on the signal from the gas detection sensor 70, the control device 11 identifies the concentration of hydrogen sulfide detected by the gas detection sensor 70, and determines whether the identified concentration is equal to or greater than a threshold value TH1 (Step 10).

[0057] Since hydrogen sulfide is not normally present inside the case 20, the threshold value TH1 may be set as the lower detection limit of the hydrogen sulfide sensor.

[0058] When the control device 11 determines that the concentration of hydrogen sulfide detected by the gas detection sensor 70 is equal to or greater than the threshold value TH1 (Yes in Step 10), the control device 11 determines whether the concentration of hydrogen sulfide detected by the gas detection sensor 71 is equal to or greater than the threshold value TH2 (Step 20). Note that the threshold value TH2 is equal to or greater than the threshold value TH1.

[0059] When the control device 11 determines that the concentration of hydrogen sulfide detected by the gas detection sensor 71 is lower than the threshold value TH2 (No in Step 20), the control device 11 executes an evacuation travel process (Step 30).

[0060] In the evacuation travel process, the output of the rotating electric machine of the drive device 10 is limited. This reduces the charge / discharge amount of the power storage device 1, making it possible to suppress the generation of hydrogen sulfide. In addition, the control device 11 displays on the HMI device 12 a message indicating that the battery is in an abnormal state and that the vehicle needs to be taken to a repair shop.

[0061] Even when the evacuation travel processing is executed, the vehicle 2 can still travel, so the user can move the vehicle 2 to a repair shop or the like.

[0062] When the control device 11 determines that the concentration of hydrogen sulfide detected by the gas detection sensor 71 is equal to or higher than the threshold value TH2 (Yes in Step 20), the control device 11 performs a system shutdown process (Step 40).

[0063] The system stop processing places the SMR in an open state (disconnected state) and cuts off the power path from the power storage device 1 to the PCU of the drive device 10. As a result, if the vehicle 2 is traveling, the vehicle 2 stops. The system stop processing also displays on the HMI device 12 a message indicating "system stop processing" and a request to "park on the shoulder of the road." After displaying "system stop processing" and "park on the shoulder" on the HMI device 12, it is preferable to delay cutting off the SMR for a short period of time during which the traveling vehicle 2 can be parked on the shoulder of the road, thereby preventing the vehicle 2 from stopping on the road.

[0064] The gas detection sensor 71 is located above the gas detection sensor 70. When the concentration of hydrogen sulfide detected by the gas detection sensor 71 is lower than the threshold value TH2, it can be inferred that the amount of hydrogen sulfide generated is small. Therefore, the control device 11 executes the evacuation travel process.

[0065] On the other hand, when the concentration of hydrogen sulfide detected by the gas detection sensor 71 is equal to or higher than the threshold value TH2, the system stop process is performed. This is because, while at least a part of the gas in the drive device 10 is exhausted to the outside from the desulfurization unit 23, hydrogen sulfide reaches above the recessed portion 68, and therefore it can be inferred that a large amount of hydrogen sulfide is being generated.

[0066] In the present embodiment, an example has been described in which a plurality of gas detection sensors 70, 71 are provided in the recess 68, but a single gas detection sensor may be provided. Even if a single gas detection sensor is provided in the recess 68, hydrogen sulfide can be detected satisfactorily.

[0067] In this embodiment, an example has been described in which a gas detection sensor is used as the "gas collecting portion", but a gas adsorbent, a gas remover, a desulfurizing agent, or the like may also be disposed in recess 68 as the "gas collecting portion".

[0068] Since hydrogen sulfide has a higher density than air, the generated hydrogen sulfide easily enters the recesses 68. Therefore, by disposing a desulfurizing agent in the recesses 68, it is possible to efficiently desulfurize the hydrogen sulfide. (Variation 1) An energy storage device 1A according to Modification 1 will be described with reference to Fig. 8 and other figures. Fig. 8 is a perspective view showing an example of the energy storage device 1A with the upper case 31 removed. A groove 80 is formed in a bottom surface 63 of the energy storage device 1A, and the configuration other than the groove 80 is the same as that of the above-described energy storage device 1.

[0069] The groove portion 80 is formed so as to extend in the horizontal direction. In the example shown in Fig. 8, the groove portion 80 is formed so as to extend in the front-rear direction L of the vehicle 2. In the front-rear direction L, the groove portion 80 is formed so as to extend from one end to the other end of the battery modules 21, 22.

[0070] The multiple gas detection sensors 70A, 70B, 70C are arranged at intervals within the groove portion 80. Therefore, even if hydrogen sulfide leaks from the battery cells 25 of any of the battery modules 21, 22, the hydrogen sulfide can be detected satisfactorily. In the first modification, the groove portion 80 corresponds to the "projection portion."

[0071] 9 is a cross-sectional view showing the configuration of the groove portion 80 and its surroundings. The groove portion 80 is formed by deforming a part of the bottom plate 60 of the lower case 30 so as to protrude downward. As a result, a bead 81 that protrudes downward is formed on the bottom plate 60.

[0072] Furthermore, by forming the grooves 80 and the beads 81 to extend in the front-rear direction L, the rigidity of the bottom plate 60 in the front-rear direction L can be increased. (Variation 2) An energy storage device 1B according to Modification 2 will be described with reference to Fig. 10 and other figures. Fig. 10 is a perspective view that typically shows the energy storage device 1B with the upper case 31 removed. The energy storage device 1B includes a plurality of battery modules 56, 57, 58 that are spaced apart in the front-rear direction L. Each of the battery modules 56, 57, 58 is formed to extend in the width direction W.

[0073] A plurality of grooves 82, 83 extending in the width direction W are formed in the bottom surface 63 of the power storage device 1B. The groove 82 is formed between the battery module 56 and the battery module 57, and the groove 83 is formed between the battery module 57 and the battery module 58.

[0074] The power storage device 1B includes a plurality of gas detection sensors 71A, 71B, and 71C provided in groove portion 82, and a plurality of gas detection sensors 71D, 71E, and 71F provided in groove portion 83. Groove portion 82 and groove portion 83 correspond to the "protruding portion" of the present disclosure.

[0075] 11 is a cross-sectional view showing groove portion 82, groove portion 83, and the configuration around them. Groove portion 82 and groove portion 83 are formed by deforming a part of bottom plate 60 of lower case 30 so as to protrude downward. As a result, beads 84 and beads 85 that protrude downward are formed on bottom plate 60.

[0076] Since the grooves 82, 83 and the beads 84, 85 are formed to extend in the width direction W, the rigidity of the bottom plate 60 in the width direction W can be increased.

[0077] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present disclosure is defined by the scope of the claims, and it is intended to include all modifications within the scope and meaning equivalent to the scope of the claims. [Explanation of symbols]

[0078] 1, 1A, 1B Electric storage device, 2 Vehicle, 10 Drive device, 11 Control device, 12 Device, 13 Drive wheel, 15 Processor, 16 Storage device, 17 RAM, 20 Case, 21, 22, 56, 57, 58 Battery module, 23 Desulfurization unit, 25 Battery cell, 26, 27 End plate, 28, 29 Fixing member, 30 Lower case, 31 Upper case, 32 Top plate, 33, 61 Peripheral wall, 35, 36 Breathing membrane, 37 Duct, 38 Desulfurization agent, 39 Opening, 40, 41, 42 Tube, 45 Laminate film, 46 Electrode body, 47 Positive electrode tab, 48 Negative electrode tab, 50 Negative electrode current collector layer, 51 Negative electrode active material layer, 52 Solid electrolyte layer, 53 Positive electrode active material layer, 54 Positive electrode collector layer, 55 unit cell, 60 bottom plate, 62 inner surface, 63 bottom surface, 64 general surface, 65 protruding surface, 66, 67 mounting surface, 68 recess, 70, 70A, 70B, 70C, 71, 71A, 71B, 71C gas detection sensor, 72 bulging portion, 80, 82, 83 groove portion, 81, 84, 85 bead, L front-rear direction, TH1, TH2 threshold value, W width direction.

Claims

1. a battery cell having a sulfide solid electrolyte; a case that houses the battery cell; At least one gas collector disposed in the case and configured to detect hydrogen sulfide; A power storage device comprising: an inner surface of the case is provided with a protruding portion protruding from the inner surface of the case toward an outside of the case; The gas collecting portion is disposed on the protruding portion.

2. The power storage device according to claim 1 , wherein the gas collector is a gas detection sensor.

3. The gas collecting section is provided in plurality, If the direction in which the protruding portion protrudes from the inner surface of the case toward the outside of the case is defined as a protruding direction, The power storage device according to claim 1 , wherein the gas collection sections are arranged at different positions in the protruding direction within the protruding portion.

4. the inner surface of the case includes a mounting surface on which the battery cell is disposed; The power storage device according to claim 1 , wherein the protruding portion is formed so as to protrude outward beyond the mounting surface toward an outside of the case.

5. The case includes a bottom plate, The power storage device according to claim 1 , wherein the protruding portion is a groove portion formed by deforming the bottom plate so as to protrude toward an outside of the case.

6. A vehicle equipped with the power storage device according to claim 1 or 2, The power storage device is mounted on the vehicle so that the protruding portion protrudes downward.

7. The case includes a bottom plate, The protruding portion is a groove portion formed by deforming the bottom plate so as to protrude downward, The vehicle according to claim 6 , wherein the groove portion is formed so as to extend in a front-rear direction of the vehicle.

8. The case includes a bottom plate, The protruding portion is a groove portion formed by deforming the bottom plate so as to protrude downward, The vehicle according to claim 6 , wherein the groove portion is formed so as to extend in a width direction of the vehicle.

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