Electricity 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 a power storage device and a vehicle. [Background technology]

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

[0003] [Patent Document 1] Japanese 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 properly.

[0006] The present disclosure has been made in consideration of the above-described 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 battery cells having a sulfide solid electrolyte. [Means for solving the problem]

[0007] The present disclosure provides an energy storage device including a battery cell having a sulfide solid electrolyte, a case for accommodating the battery cell, and at least one gas collection unit disposed within the case for detecting hydrogen sulfide, wherein the inner surface of the case has a protruding portion that protrudes from the inner surface of the case toward the outside of the case, and the gas collection unit is disposed on the protruding portion. The gas collection unit is 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 arranged, and the protruding portion is formed to protrude outward from the mounting surface.

[0010] The case includes a bottom plate, and the protruding portion is a groove formed by deforming the bottom plate so that it protrudes outward from the case. A vehicle equipped with the above-described 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 formed by deforming the bottom plate so that it protrudes downward, and the groove is formed to extend in the fore-and-aft 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 to extend in the width direction of the vehicle. [Effects of the Invention]

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

[0013] [Figure 1]1 is a schematic diagram showing a vehicle 2 equipped with an electricity storage device 1 according to the present embodiment. [Figure 2] FIG. 1 is a perspective view showing an electricity storage device 1. [Figure 3] FIG. 2 is a perspective view showing a schematic view of the case 20 with the upper case 31 removed. [Figure 4] FIG. 1 is a cross-sectional view showing an electricity storage device 1. [Figure 5] FIG. 2 is a plan view schematically showing a battery cell 25. [Figure 6] FIG. 2 is a cross-sectional view showing a battery cell 25. [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 schematically shows an electricity storage device 1A with an upper case 31 removed. FIG. [Figure 9] FIG. 2 is a cross-sectional view showing a groove 80 and the surrounding structure. [Figure 10] 2 is a perspective view that schematically shows an electricity storage device 1B with an upper case 31 removed. FIG. [Figure 11] FIG. 2 is a cross-sectional view showing the configuration of grooves 82 and 83 and their surroundings. DETAILED DESCRIPTION OF THE INVENTION

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

[0015] 1 is a schematic diagram showing a vehicle 2 equipped with a power storage device 1 according to this 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 driving force for driving drive wheels 13 using power supplied from the power storage device 1. The control device 11 controls the driving 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 pieces of information are input by a user, and a display unit that displays various pieces of 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 also 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 power 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 arranged to close the opening of the lower case 30.

[0021] 3 is a perspective view showing the case 20 with the upper case 31 removed. The lower case 30 includes a bottom plate 60 and a peripheral wall 61. The peripheral wall 61 is formed to extend upward from the outer peripheral edge of the bottom plate 60, and 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 toward the outside of the case 20. Accordingly, the protruding surface 65 is also formed so as to protrude from the inner surface 62 toward the outside of the case 20.

[0025] When 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 and 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] 4 is a cross-sectional view showing the energy storage device 1 taken along line IV-IV in FIG. 2. The recess 68 is formed by bending the bottom plate 60. The energy storage device 1 includes gas detection sensors 70 and 71 disposed in the recess 68. The gas detection sensors 70 and 71 capture hydrogen sulfide gas when detecting hydrogen sulfide gas, and are an example of a "gas collection unit" of the present disclosure. The gas collection unit 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 (HS) contained in the atmosphere, and the hydrogen sulfide sensors may be, for example, hot-wire semiconductor sensors or constant-potential electrolysis sensors.

[0030] Gas detection sensors 70 and 71 differ in the position in the direction in which recess 68 protrudes outward from case 20. When power storage device 1 is mounted on vehicle 2, gas detection sensors 70 and 71 differ in the up-down position. 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 that it protrudes downward. As a result, a bulge 72 that protrudes downward is formed on the lower surface of the bottom plate 60. As a method for forming the recess 68, for example, the recess 68 may be formed by reducing the thickness of the bottom plate 60. When the recess 68 is formed by reducing the thickness of the bottom plate 60, the lower surface of the bottom plate 60 can be made flat. As a result, when the power storage device 1 is arranged 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 peripheral edge 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] Duct 37 includes pipe portion 40, pipe portion 41, and pipe portion 42. Pipe portion 40 extends downward from opening 39. Pipe portion 41 is disposed at the lower end of pipe portion 40 and is formed to extend horizontally. Pipe portion 42 is connected to the end of pipe portion 41 and is formed to extend upward. Breathing membrane 36 is provided to close the opening formed at the end of pipe portion 42.

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

[0036] The desulfurizing agent 38 may be, for example, a pellet-shaped desulfurizing agent containing iron oxide as a main component, 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 and 27, and fixing members 28 and 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). The restraining force from the restraining band secures multiple battery cells 25 between end plate 26 and end plate 27. Fixing member 28 secures end plate 26 to case 20, and fixing member 29 secures end plate 27 to case 20. Battery module 22 has the same configuration as battery module 21.

[0039] 5 is a plan view that schematically shows 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 a laminate film 45. A positive electrode tab 47 and a negative electrode tab 48 are connected to the electrode body 46 and extend 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 assembly 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 the sulfide-based solid electrolyte may be, for example, one made from 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. Note that 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 electricity storage device 1 configured as described above, the electricity storage device 1 repeatedly charges and discharges. During this process, hydrogen sulfide gas may be generated inside the battery cells 25.

[0048] For example, in Figure 5, gaps may occur where the positive electrode tab 47 and the negative electrode tab 48 extend from the laminate film 45, allowing air to penetrate the laminate film 45. This may then cause a reaction between the solid electrolyte layer 52 and water in the air, generating hydrogen sulfide gas. Thus, when seal-out is the cause, the amount of hydrogen generated is relatively small.

[0049] On the other hand, for example, an internal short circuit occurring within the electrode body 46 may cause the electrode body 46 to reach a high temperature, resulting in the generation of hydrogen sulfide gas. The amount of hydrogen sulfide generated by an internal short circuit is greater than the amount of hydrogen sulfide generated by seal-out.

[0050] When hydrogen sulfide generated from battery modules 21, 22 reaches recessed portion 68, gas detection sensors 70, 71 can detect the hydrogen sulfide. Because hydrogen sulfide gas has a specific gravity heavier than air, it accumulates on bottom surface 63 of case 20 in FIG. 4. In particular, because recessed portion 68 is formed 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 and 71 are disposed in the recess 68, when hydrogen sulfide gas is generated, the gas detection sensors 70 and 71 can detect the hydrogen sulfide gas properly.

[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 inside the case 20 and the internal pressure inside the case 20 increases, the gas inside 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. As the gas inside 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 prevent 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 limit of detection 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 performs 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 greater than the threshold value TH2 (Yes in Step 20), the control device 11 performs a system shutdown process (Step 40).

[0063] The system shutdown process opens the SMR (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. Furthermore, the system shutdown process displays on the HMI device 12 a message indicating "system shutdown process" and a request to "park on the shoulder of the road." After displaying "system shutdown process" and "park on the shoulder" on the HMI device 12, it is preferable to delay the shutdown of the SMR for a short period of time to allow the traveling vehicle 2 to 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. If 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, if the concentration of hydrogen sulfide detected by the gas detection sensor 71 is equal to or higher than the threshold value TH2, the system is shut down. This is because, while at least a portion of the gas in the drive device 10 is being exhausted to the outside from the desulfurization unit 23, hydrogen sulfide has reached above the recess 68, and 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 recess 68, but a single gas detection sensor may be provided. Even if a single gas detection sensor is provided in 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 collection section," but a gas adsorbent, gas remover, desulfurization agent, etc. may also be placed in the recess 68 as the "gas collection section."

[0068] Since hydrogen sulfide has a higher density than air, the generated hydrogen sulfide easily enters the recessed portion 68. Therefore, by disposing a desulfurizing agent in the recessed portion 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 schematically showing the energy storage device 1A with the upper case 31 removed. A groove 80 is formed in the bottom surface 63 of the energy storage device 1A, and the configuration other than the groove 80 is the same as that of the energy storage device 1 described above.

[0069] The grooves 80 are formed to extend horizontally. In the example shown in Fig. 8, the grooves 80 are formed to extend in the front-rear direction L of the vehicle 2. In the front-rear direction L, the grooves 80 are formed to extend from one end to the other end of the battery modules 21, 22.

[0070] The gas detection sensors 70A, 70B, and 70C are arranged at intervals within the groove portion 80. Therefore, even if hydrogen sulfide leaks from a battery cell 25 of either battery module 21 or 22, the hydrogen sulfide can be detected effectively. In the first modification, the groove portion 80 corresponds to the "projection portion."

[0071] 9 is a cross-sectional view showing the configuration of groove 80 and its surroundings. Groove 80 is formed by deforming a portion of bottom plate 60 of lower case 30 so that it protrudes downward. As a result, a bead 81 that protrudes downward is formed on 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 schematically 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 arranged at intervals 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 on the bottom surface 63 of the energy 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 a groove portion 82, and a plurality of gas detection sensors 71D, 71E, and 71F provided in a groove portion 83. The groove portion 82 and the groove portion 83 correspond to the "extending portion" of the present disclosure.

[0075] 11 is a cross-sectional view showing grooves 82 and 83 and the surrounding structure. Groove 82 and groove 83 are formed by deforming a portion of bottom plate 60 of lower case 30 so that it protrudes downward. As a result, beads 84 and 85 that protrude downward are formed on bottom plate 60.

[0076] Furthermore, 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 meaning and scope of the claims. [Explanation of symbols]

[0078] 1, 1A, 1B Electricity 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 Surrounding wall, 35, 36 Breathing membrane, 37 Duct, 38 Desulfurization agent, 39 Opening, 40, 41, 42 Tube portion, 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 current 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-to-rear direction, TH1, TH2 threshold, W width direction.

Claims

1. a battery cell having a sulfide solid electrolyte; a lower case that houses the battery cell; an upper case located above the lower case; At least one gas detection sensor disposed in the lower case and configured to detect hydrogen sulfide; At least one desulfurization unit disposed within the upper case; A power storage device comprising: an inner surface of the lower case is formed with a protruding portion that protrudes from the inner surface of the lower case toward an outside of the lower case; The gas detection sensor is disposed on the protruding portion.

2. A battery module is formed by arranging the battery cells in one direction, 2. The power storage device according to claim 1, wherein the battery module includes end plates and fixing members at both ends of the battery module, and the fixing members are located outside the end plates.

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

4. an inner surface of the lower case including a mounting surface on which the battery cells are disposed; The power storage device according to claim 1 or 2, wherein the protruding portion is formed to protrude outward from the lower case beyond the mounting surface.

5. the lower case includes a bottom plate, 3. The power storage device according to claim 1, wherein the protruding portion is a groove formed by deforming the bottom plate so as to protrude outward from the lower 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 lower 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 lower 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.

9. A battery cell having a sulfide solid electrolyte; a case that houses the battery cell; At least one gas collector disposed within the case and configured to detect hydrogen sulfide; A power storage device comprising: an inner surface of the case is formed with a protruding portion that protrudes from the inner surface of the case toward an outside of the case; the gas collecting portion is disposed on the protruding portion, 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 plurality of gas collection sections are arranged within the protruding section at different positions in the protruding direction.

10. A battery cell having a sulfide solid electrolyte; a case that houses the battery cell; At least one gas collector disposed within the case and configured to detect hydrogen sulfide; A power storage device comprising: an inner surface of the case is formed with a protruding portion that protrudes from the inner surface of the case toward an outside of the case; the gas collecting portion is disposed on the protruding portion, the case includes a bottom plate; The protruding portion is a groove portion formed by deforming the bottom plate so that the protruding portion protrudes toward the outside of the case.

11. A vehicle equipped with an electricity storage device, The power storage device is a battery cell having a sulfide solid electrolyte; a case that houses the battery cell; At least one gas collector disposed within the case and configured to detect hydrogen sulfide; Equipped with an inner surface of the case is formed with a protruding portion that protrudes from the inner surface of the case toward an outside of the case; the gas collecting portion is disposed on the protruding portion, 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 groove portion is formed to extend in a front-rear direction of the vehicle.

12. A vehicle equipped with an electricity storage device, The power storage device is a battery cell having a sulfide solid electrolyte; a case that houses the battery cell; At least one gas collector disposed within the case and configured to detect hydrogen sulfide; Equipped with an inner surface of the case is formed with a protruding portion that protrudes from the inner surface of the case toward an outside of the case; the gas collecting portion is disposed on the protruding portion, 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 groove portion is formed to extend in a width direction of the vehicle.

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