Power storage device and vehicle

Abstract

To provide a power storage device in which a cover on the lower side of a case can be easily removed.SOLUTION: A power storage device 1 includes a power storage module 100 including a plurality of power storage cells 110, and a case 200 that houses the power storage module 100. The case 200 includes an upper cover 220 (first cover) that covers the power storage module 100 from above, and a lower cover 210 (second cover) that covers the power storage module 100 from below. The power storage module 100 is fixed to the upper cover 220. The lower cover 210 is detachably fixed to the upper cover 220.SELECTED DRAWING: Figure 3

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. 2023-046945 (Patent Document 1) discloses a battery pack that houses multiple battery modules. The battery case, which is the outer shell of the battery pack, is composed of an upper case and a lower case. The battery modules are placed on top of the lower case. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2023-046945 Summary of the Invention [Problem to be solved by the invention]

[0004] As described above, since the battery module is placed on top of the lower case, there has been a problem in that the workability when repairing the lower case (lower cover) is poor.

[0005] The present disclosure has been made to solve the above-mentioned problems, and has an object to provide an electricity storage device and a vehicle in which the cover on the lower side of the case can be easily removed. [Means for solving the problem]

[0006] An energy storage device according to a first aspect of the present disclosure includes an energy storage module including a plurality of energy storage cells, and a case that houses the energy storage module. The case includes a first cover that covers the energy storage module from above, and a second cover that covers the energy storage module from below. The energy storage module is fixed to the first cover. The second cover is detachably fixed to the first cover. Note that "detachably fixed" means that the objects are fixed so that they can be non-destructively separated from each other. On the other hand, "non-detachably fixed" means that the objects are fixed so that at least one of them is destroyed (for example, the surface is peeled off) when they are separated from each other.

[0007] In the energy storage device according to the first aspect of the present disclosure, as described above, the energy storage module is fixed to the first cover, and the second cover is detachably fixed to the first cover. As a result, even if the second cover is removed from the first cover, the energy storage module is fixed to the first cover, so that the energy storage module is prevented from being removed together with the second cover. This allows the second cover to be easily removed.

[0008] The energy storage device may further include a third cover provided below the second cover. The rigidity of the second cover may be higher than the rigidity of the third cover. With this configuration, the third cover can prevent the second cover from being damaged by foreign matter flying from below. Furthermore, since the rigidity of the second cover is higher than the rigidity of the third cover, the second cover can be more effectively prevented from being damaged compared to when the rigidity of the second cover is equal to or lower than the rigidity of the third cover.

[0009] The third cover may be removably fixed to the second cover from below. With this configuration, the third cover can be removed from the second cover if the third cover is damaged, for example.

[0010] In the range where the second cover and the third cover overlap in the vertical direction, the vertical distance between the second cover and the third cover is smaller than the vertical distance between the second cover and the power storage module. With this configuration, the vertical height of the power storage device can be reduced compared to when the vertical distance between the second cover and the third cover is equal to or greater than the vertical distance between the second cover and the power storage module. Furthermore, because the vertical distance between the second cover and the power storage module is relatively large, an exhaust path for smoke exhausted downward from the power storage module can be easily secured, and interference (impact) from below can be prevented from being input to the power storage module.

[0011] The first cover may include a top plate portion located above the energy storage module and a fixing portion provided on the top plate portion. The energy storage module may be fixed to the fixing portion, and the second cover may be fixed to the fixing portion from below. With this configuration, stress on the top plate portion can be reduced compared to when the second cover is directly fixed to the top plate portion.

[0012] The fixing portion may be provided so as to extend downward from the top plate portion. With this configuration, the fixing portion can be easily joined to the second cover provided below the top plate portion.

[0013] The energy storage device may further include a frame member arranged to surround the fixing portion and the energy storage module, and a sealing member that seals between the frame member and the second cover. Each of the first cover and the second cover may be fixed to the frame member. The sealing member may be provided near the location where the second cover and the frame member are fixed. With this configuration, the sealing member can prevent water and the like from entering between the second cover and the frame member. Note that "surrounding the fixing portion and the energy storage module" does not only mean surrounding the fixing portion and the energy storage module circumferentially, but also includes sandwiching the fixing portion and the energy storage module in a predetermined direction. Furthermore, "near a location" includes not only the target location itself but also the vicinity thereof.

[0014] The second cover may be fixed to the frame member below the power storage module. With this configuration, it is possible to prevent the second cover from interfering with the power storage module when the second cover is removed (when the second cover is moved downward).

[0015] The energy storage device may further include a fastening member that fastens the second cover and the fixing portion. The second cover may include a cover main body and a raised portion formed so as to be recessed upward from the cover main body. The fastening member may fasten the raised portion and the fixing portion. With this configuration, the mechanical strength of the second cover can be increased compared to when the second cover does not have a raised portion. Furthermore, since the fastening point between the fastening member and the raised portion is provided on the raised portion, the fastening point can be located higher than when the second cover does not have a raised portion. As a result, the fastening member can be prevented from being affected by interference from below (interference from below).

[0016] The fastening member may be arranged so that the lower end of the fastening member is positioned at the same position as the lower surface of the cover body or higher than the lower surface in the vertical direction. This configuration can further reduce the influence of interference from below on the fastening member (interference from below).

[0017] The rigidity of the second cover may be greater than the rigidity of the first cover. With this configuration, the second cover can be prevented from being damaged (broken) compared to when the rigidity of the second cover is equal to or less than the rigidity of the first cover.

[0018] In the range where the first cover and the power storage module overlap in the vertical direction, the vertical distance between the first cover and the power storage module may be smaller than the vertical distance between the second cover and the power storage module. With this configuration, the vertical height of the power storage device can be reduced compared to when the vertical distance between the first cover and the power storage module is equal to or greater than the vertical distance between the second cover and the power storage module. Furthermore, because the vertical distance between the second cover and the power storage module is relatively large, an exhaust path for smoke exhausted downward from the power storage module can be easily secured, and interference (impact) from below can be prevented from being input to the power storage module.

[0019] A vehicle according to a second aspect of the present disclosure includes a vehicle body and the power storage device according to the first aspect fixed to the bottom of the vehicle body, thereby providing a vehicle in which the second cover can be easily removed from the vehicle body (power storage device). [Effects of the Invention]

[0020] According to the present disclosure, the lower cover of the case that houses the power storage module can be easily removed. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a diagram showing a configuration of a vehicle equipped with a power storage device according to an embodiment; [Figure 2] 1 is a cross-sectional view showing the configuration of an electricity storage device according to an embodiment, as viewed from above. [Figure 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2. [Figure 4] FIG. 2 is a schematic diagram showing the configuration of an upper cross. [Figure 5] 4 is a partially enlarged view of the vicinity of the upper cross and the lower cross of FIG. 3. FIG. [Figure 6] FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. [Figure 7] FIG. 3 is a partially enlarged view of the vicinity of the power storage module in FIG. 2. [Figure 8] 7 is a partially enlarged view of the vicinity of the upper cross and the lower cross of FIG. 6. FIG. [Figure 9] FIG. 4 is a flowchart illustrating a method for removing a lower cover from an electric storage device according to one embodiment. [Figure 10] 10 is a cross-sectional view showing the electricity storage device in the process of step S4 in FIG. 9. FIG. [Figure 11] 10 is a cross-sectional view showing the electricity storage device in the process of step S5 in FIG. 9. FIG. [Figure 12] 10 is a cross-sectional view showing the electricity storage device in the process of step S6 in FIG. 9. FIG. [Figure 13] 10 is a cross-sectional view showing the configuration of a power storage device according to a first modified example of an embodiment, as viewed from above. FIG. [Figure 14] 10 is a partially enlarged cross-sectional view showing a configuration in the vicinity of a bottom surface of a lower cover according to a second modified example of the embodiment. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0022] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] The present disclosure will be described with reference to the accompanying drawings, in which the same or corresponding elements are designated by the same reference numerals.

[0023] 1 is a diagram showing a vehicle 10 equipped with a power storage device 1 according to an embodiment of the present disclosure. The power storage device 1 is a device for storing electric power for driving the vehicle 10. The vehicle 10 includes, for example, a plug-in hybrid electric vehicle (PHEV), a battery electric vehicle (BEV), or a fuel cell electric vehicle (FCEV).

[0024] The X direction, Y direction, and Z direction shown in this specification are directions that are perpendicular to each other. For example, the X direction and Y direction may be the front-rear direction and the left-right direction of the vehicle 10, respectively. The Z direction may be the up-down (vertical) direction. The Z direction is an example of the "up-down direction" in the present disclosure. The Z1 side and Z2 side are examples of the "upper" and "lower" in the present disclosure, respectively.

[0025] The vehicle 10 includes a vehicle body 11 in addition to the power storage device 1. The vehicle body 11 has an underbody 11a. The underbody 11a is provided on the lower part (bottom) of the vehicle body 11. The power storage device 1 is disposed in the underbody 11a. Specifically, the power storage device 1 is fixed (fastened) to the underbody 11a below the underbody 11a. The underbody 11a is an example of the "bottom" in the present disclosure.

[0026] <Configuration of the power storage device> 2, the energy storage device 1 includes an energy storage module 100, a case 200, and a frame 300. The case 200 houses the energy storage module 100. The frame 300 is an example of a "frame member" in the present disclosure.

[0027] 2, the energy storage device 1 is provided with a plurality of (three in this embodiment) energy storage modules 100. The plurality of energy storage modules 100 are arranged side by side in the X direction. Note that the number of energy storage modules 100 provided in the energy storage device 1 may be other than three (for example, one).

[0028] Each of the plurality of power storage modules 100 includes a plurality of power storage cells 110 and a module case 120. The module case 120 is made of a metal such as aluminum.

[0029] In each of the plurality of energy storage modules 100, the plurality of energy storage cells 110 are housed in a module case 120. The plurality of energy storage cells 110 in each energy storage module 100 are arranged (stacked) in the Y direction. Each of the plurality of energy storage cells 110 has a rectangular parallelepiped shape that is long in the X direction. Specifically, the energy storage cell 110 is formed so that the length in the X direction is greater than the length in the Y direction and the height in the Z direction. Note that each energy storage cell 110 may be arranged so that its longitudinal direction is in the Y direction.

[0030] The module case 120 of each of the plurality of power storage modules 100 includes a case body 121 and a plurality (eight in this embodiment) of connection parts 122. The case body 121 has a hollow rectangular parallelepiped shape and houses a plurality of power storage cells 110 therein.

[0031] The multiple connection portions 122 are provided to extend in the X direction from the case body 121. Specifically, four of the eight connection portions 122 protrude toward the X1 side from a side surface portion 121a on the X1 side of the case body 121. The remaining four of the eight connection portions 122 protrude toward the X2 side from a side surface portion 121b on the X2 side of the case body 121.

[0032] The four connecting portions 122 on side surface portion 121a and the four connecting portions 122 on side surface portion 121b are arranged at the same position in the Y direction. Furthermore, on each of side surface portion 121a and side surface portion 121b, the four connecting portions 122 are arranged at equal intervals. Note that the eight connecting portions 122 are arranged at the same height position in the Z direction.

[0033] The power storage modules 100 adjacent to each other in the X direction are arranged so that their Y direction orientations are reversed to each other, so that the positions of the connection parts 122 in the Y direction are shifted between the power storage modules 100 adjacent to each other in the X direction.

[0034] Referring to Fig. 3, case 200 includes lower cover 210, upper cover 220, and shear panel 230 (Fig. 3). Lower cover 210, upper cover 220, and shear panel 230 are each formed of metal (e.g., iron). Upper cover 220 and lower cover 210 are examples of a "first cover" and a "second cover," respectively, in the present disclosure. Shear panel 230 is an example of a "third cover" in the present disclosure.

[0035] The lower cover 210 is located on the Z2 side of the power storage modules 100 and is provided so as to cover the power storage modules 100 from the Z2 side. The lower cover 210 extends in the X direction so as to straddle the power storage modules 100.

[0036] The upper cover 220 includes an upper cross 221. The upper cover 220 includes a plurality of (four in this embodiment) upper crosses 221. Each of the plurality of upper crosses 221 is provided to extend in the Y direction. The plurality of upper crosses 221 are arranged side by side in the X direction. Specifically, the plurality of upper crosses 221 are arranged at equal intervals in the X direction. Each of the plurality of power storage modules 100 is provided between the upper crosses 221 arranged side by side in the X direction. The upper crosses 221 are an example of a "fixing portion" in the present disclosure.

[0037] An end 221a on the Y2 side of the upper cross 221 is joined (for example, welded) to a wall portion 310 (described later) of the frame 300. An end 221b on the Y1 side of the upper cross 221 is joined (for example, welded) to a wall portion 320 (described later) of the frame 300.

[0038] The upper cross 221 includes a pair of side surface portions 221c and a bottom surface portion 221d. Each of the pair of side surface portions 221c is formed to extend in the Z direction. Furthermore, each of the pair of side surface portions 221c is provided to extend in the Y direction. That is, each of the pair of side surface portions 221c extends perpendicular to the X direction. Furthermore, the pair of side surface portions 221c are provided to face each other in the X direction.

[0039] The bottom surface portion 221d connects the lower ends of the pair of side surface portions 221c to each other (FIG. 3). The bottom surface portion 221d is provided to extend in the X direction. The bottom surface portion 221d is also provided to extend in the Y direction. That is, the bottom surface portion 221d extends perpendicular to the Z direction. Note that in the upper cross 221, each of the pair of side surface portions 221c is perpendicular to the bottom surface portion 221d.

[0040] A cavity extending in the Y direction is formed between the pair of side surface portions 221c (on the Z1 side of the bottom surface portion 221d). That is, the upper cross 221 has a hollow shape.

[0041] The frame 300 is provided so as to surround the plurality of energy storage modules 100 when viewed from the Z1 side. That is, the frame 300 is formed in a rectangular frame shape when viewed from the Z1 side. The frame 300 also extends in the Z direction. That is, the frame 300 has a hollow rectangular tube shape extending in the Z direction.

[0042] The frame 300 includes a wall portion 310, a wall portion 320, a wall portion 330, and a wall portion 340. Each of the wall portion 310 and the wall portion 320 extends perpendicular to the Y direction. Each of the wall portion 330 and the wall portion 340 extends perpendicular to the X direction.

[0043] The wall 310 is provided so as to cover the plurality of power storage modules 100 and the plurality of upper crosses 221 from the Y2 side. The wall 320 is provided so as to cover the plurality of power storage modules 100 and the plurality of upper crosses 221 from the Y1 side. The wall 310 and the wall 320 extend in the X direction so as to straddle the plurality of power storage modules 100 and the plurality of upper crosses 221 lined up in the X direction. The plurality of power storage modules 100 and the plurality of upper crosses 221 are sandwiched in the Y direction between the wall 310 and the wall 320.

[0044] The wall portion 330 is provided so as to cover, from the X1 side, the power storage module 100 closest to the X1 side among the multiple power storage modules 100. The wall portion 330 is arranged in a direction away from the power storage module 100 than the upper cross 221 closest to the X1 side among the multiple upper crosses 221.

[0045] The wall portion 340 is provided so as to cover, from the X2 side, the power storage module 100 closest to the X2 side among the multiple power storage modules 100. The wall portion 340 is arranged in a direction away from the power storage module 100 than the upper cross 221 closest to the X2 side among the multiple upper crosses 221.

[0046] The plurality of power storage modules 100 and the plurality of upper crosses 221 are sandwiched between the wall portion 330 and the wall portion 340 in the X direction.

[0047] The wall 310 is connected to each of the wall 330 and the wall 340. Specifically, the X1-side end of the wall 310 is connected to the Y2-side end of the wall 330. The X2-side end of the wall 310 is connected to the Y2-side end of the wall 340.

[0048] Wall 320 is connected to each of wall 330 and wall 340. Specifically, the X1-side end of wall 320 is connected to the Y1-side end of wall 330. The X2-side end of wall 320 is connected to the Y1-side end of wall 340.

[0049] The wall portions 310 to 340 are joined together by, for example, welding (arc welding or the like).

[0050] Wall portions 310 to 340 respectively have upper end surfaces 311, 321, 331, and 341. Upper end surfaces 311, 321, 331, and 341 are provided at the upper ends of wall portion 310, wall portion 320, wall portion 330, and wall portion 340, respectively.

[0051] Each of upper end surfaces 311, 321, 331, and 341 is joined to outer peripheral edge 222a (FIG. 3) of upper cover 220. Each of upper end surfaces 311, 321, 331, and 341 is joined to outer peripheral edge 222a by FSW (Friction Stir Welding).

[0052] 3 is a cross-sectional view at a position in the Y direction where the connection portion 122 is provided. As shown in FIG. 3, the upper cover 220 is provided so as to cover the multiple power storage modules 100 from the Z2 side. Specifically, the upper cover 220 includes a top panel portion 222 located on the Z1 side of the multiple power storage modules 100. The top panel portion 222 extends in the X direction so as to straddle the multiple power storage modules 100. Parts (end portions in the X direction) of the top panel portion 222 protrude in the X direction from the area where the multiple power storage modules 100 are arranged to the X1 side and the X2 side. The top panel portion 222 extends so as to be perpendicular to the Z direction.

[0053] Each of the multiple upper crosses 221 is provided on the top panel portion 222. Specifically, each of the multiple upper crosses 221 is fixed by welding or the like to a surface 222b of the top panel portion 222 on the power storage module 100 side (Z2 side).

[0054] Each of the plurality of upper cross members 221 is formed to extend downward from the top plate portion 222 .

[0055] The upper cross 221 includes a pair of upper end portions 221e fixed to the surface 222b of the top panel portion 222. One of the pair of upper end portions 221e is connected to one of the pair of side surface portions 221c. The other of the pair of upper end portions 221e is connected to the other of the pair of side surface portions 221c. The side surface portions 221c and the upper end portion 221e, which are connected to each other, are perpendicular to each other. The pair of upper end portions 221e extend in directions away from each other from the connection point with the side surface portions 221c. Furthermore, each of the pair of upper end portions 221e is formed to extend in the Y direction (FIG. 4). That is, each of the pair of upper end portions 221e extends perpendicular to the Z direction. The upper cross 221 has a downwardly convex shape (a hat shape).

[0056] Each of the pair of upper end portions 221e is formed integrally with the side surface portion 221c. Each of the pair of side surface portions 221c is formed integrally with the bottom surface portion 221d. In other words, the upper cross 221 is formed by bending a single metal plate multiple times. This makes the rigidity of the upper cross 221 higher than the rigidity of the top plate portion 222.

[0057] In a conventional power storage device, the power storage module is disposed (placed) on the lower cover, so when the lower cover is removed for repair or the like, the power storage module is also removed.

[0058] Therefore, in this embodiment, each of the plurality of power storage modules 100 is fixed to the upper cover 220. As a result, the power storage modules 100 are held by the upper cover 220 even when the lower cover 210 is removed.

[0059] Specifically, each of the plurality of connection portions 122 of the module case 120 is fixed to the upper cross 221. Each of the plurality of connection portions 122 is fixed to the bottom surface portion 221d of the upper cross 221 from below.

[0060] More specifically, the bottom surface portion 221 d of the upper cross 221 and the connection portion 122 of the module case 120 are fastened together by a bolt 400 .

[0061] The lower cover 210 includes a plurality of lower cross sections 211 and a bottom plate portion 212. The bottom plate portion 212 is located on the Z2 side of the plurality of energy storage modules 100. The bottom plate portion 212 is provided so as to cover the plurality of energy storage modules 100 from the Z2 side. The bottom plate portion 212 extends in the X direction so as to straddle the plurality of energy storage modules 100. Parts (end portions in the X direction) of the bottom plate portion 212 protrude in the X direction from the area where the plurality of energy storage modules 100 are arranged to each of the X1 side and the X2 side.

[0062] Each of the multiple lower crosses 211 is provided on the bottom plate portion 212. Specifically, each of the multiple lower crosses 211 is fixed by welding or the like to a surface 212a of the bottom plate portion 212 on the energy storage module 100 side (Z1 side). The lower crosses 211 are provided to extend from the bottom plate portion 212 to the Z1 side. Note that the bottom plate portion 212 includes a bottom surface portion 212g (described later) and a raised portion 212h ( FIG. 6 ) (described later), but in the cross section shown in FIG. 3 , only the bottom surface portion 212g is visible and not the raised portion 212h. Therefore, the bottom plate portion 212 in the description of FIG. 3 means the bottom surface portion 212g.

[0063] The lower cross member 211 has the same shape as the upper cross member 221. The lower cross member 211 has a shape obtained by turning the upper cross member 221 upside down. In other words, the lower cross member 211 has an upwardly convex shape (hat shape).

[0064] Specifically, the lower cross member 211 has a pair of side surface portions 211c corresponding to the pair of side surface portions 221c of the upper cross member 221. The lower cross member 211 has a top surface portion 211d corresponding to the bottom surface portion 221d of the upper cross member 221. The lower cross member 211 has a pair of bottom end portions 211e corresponding to the pair of top end portions 221e of the upper cross member 221.

[0065] Specifically, each of the pair of side surface portions 211c is formed to extend in the Z direction. Each of the pair of side surface portions 211c is provided to extend in the Y direction. That is, each of the pair of side surface portions 211c extends perpendicular to the X direction. Furthermore, the pair of side surface portions 211c are provided to face each other in the X direction.

[0066] The top surface portion 211d connects the lower ends of the pair of side surface portions 211c (FIG. 3). The top surface portion 211d is provided to extend in the X direction. The top surface portion 211d is also provided to extend in the Y direction. That is, the top surface portion 211d extends perpendicular to the Z direction. Note that in the lower cross 211, each of the pair of side surface portions 211c is perpendicular to the top surface portion 211d.

[0067] A cavity extending in the Y direction is formed between the pair of side surface portions 211c (on the Z2 side of the upper surface portion 211d). That is, the lower cross 211 has a hollow shape.

[0068] Each of the pair of lower end portions 211e is fixed to the surface 212a of the bottom plate portion 212. One of the pair of lower end portions 211e is connected to one of the pair of side surface portions 211c. The other of the pair of lower end portions 211e is connected to the other of the pair of side surface portions 211c. The side surface portions 211c and the lower end portions 211e that are connected to each other are perpendicular to each other. The pair of lower end portions 211e extend in directions away from each other from the connection point with the side surface portion 211c.

[0069] Each of the pair of lower end portions 211e is formed integrally with the side surface portion 211c. Each of the pair of side surface portions 211c is formed integrally with the upper surface portion 211d. That is, like the upper cross portion 221, the lower cross portion 211 is formed by bending a single metal plate multiple times.

[0070] Each of the lower crosses 211 is provided at a position overlapping with the upper crosses 221 in the Z direction. That is, a lower cross 211 is disposed below each of the four upper crosses 221.

[0071] In the area where it overlaps with multiple energy storage modules 100 in the vertical direction, the distance D1 in the Z direction between the upper cover 220 (top plate portion 222) and the energy storage modules 100 is smaller than the distance D2 in the Z direction between the lower cover 210 (bottom plate portion 212) and the energy storage modules 100.

[0072] The energy storage module 100 is configured to exhaust smoke to the Z2 side. That is, the space on the side where the smoke is exhausted (the space on the Z2 side of the energy storage module 100) is relatively larger than the space on the opposite side to the above space (the space on the Z1 side of the energy storage module 100).

[0073] The upper cross 221 has a length L1 in the Z direction. The lower cross 211 has a length L2 in the Z direction. The length L2 is shorter than the length L1. This makes the lower cover 210 relatively compact, making it easier to replace the lower cover 210. Note that the length L2 may be equal to or greater than the length L1.

[0074] The electricity storage device 1 includes a sealing member 500 and a sealing member 510. The sealing member 500 is provided separately from the sealing member 510. Each of the sealing member 500 and the sealing member 510 may be, for example, a urethane seal. Each of the sealing member 500 and the sealing member 510 may have adhesive properties.

[0075] The sealing member 500 is provided to seal the gap between the lower end portion 332 of the wall portion 330 and a portion 212c near the outer peripheral edge 212b on the X1 side of the bottom plate portion 212 of the lower cover 210. Although not shown in the drawings, the sealing member 500 extends in the Y direction along the wall portion 330.

[0076] The sealing member 510 is provided to seal the gap between the lower end portion 342 of the wall portion 340 and a portion 212e near the outer peripheral edge 212d on the X2 side of the bottom plate portion 212 of the lower cover 210. Although not shown in the drawings, the sealing member 510 extends in the Y direction along the wall portion 340.

[0077] Sealing members 500 and 510 bond (fix) bottom plate portion 212 of lower cover 210 to each of wall portions 330 and 340. Note that sealing members may also be provided between bottom plate portion 212 and each of wall portions 310 and 320.

[0078] The energy storage device 1 includes a rivet 600 and a rivet 610. The rivet 600 secures the lower end 332 of the wall 330 to the outer peripheral edge 212b of the lower cover 210. That is, the sealing member 500 is provided near the location where the rivet 600 secures the lower end 332 to the outer peripheral edge 212b. The rivet 600 is provided on the X1 side of the sealing member 500 (the opposite side of the sealing member 500 from the energy storage module 100). Note that a plurality of rivets 600 may be arranged in a row in the Y direction along the wall 330.

[0079] The rivet 610 secures the lower end 342 of the wall 340 to the outer peripheral edge 212d of the lower cover 210. That is, the sealing member 510 is provided near the location where the rivet 610 secures the lower end 342 to the outer peripheral edge 212d. The rivet 610 is provided on the X2 side of the sealing member 510 (the opposite side of the sealing member 510 from the energy storage module 100). Note that a plurality of rivets 610 may be arranged in a line in the Y direction along the wall 340.

[0080] The bottom plate portion 212 of the lower cover 210 is fixed to each of the wall portions 330 and 340 on the Z2 side of the power storage module 100. That is, each of the outer peripheral edges 212b and 212d of the bottom plate portion 212 is located on the Z2 side of the bottom portion 123 of the module case 120. The bottom portion 123 is provided at the end of the module case 120 on the Z2 side.

[0081] Furthermore, each of the portion 212c and the portion 212e of the bottom plate portion 212 is located closer to the Z2 side than the bottom portion 123 of the module case 120.

[0082] Outer peripheral edge 212b and outer peripheral edge 212d are provided closer to the Z1 side than portion 212c and portion 212e, respectively. That is, a step is formed between outer peripheral edge 212b and portion 212c, and between outer peripheral edge 212d and portion 212e. Note that outer peripheral edge 212b and outer peripheral edge 212d may be provided at the same position as portion 212c and portion 212e in the Z direction or closer to the Z2 side than portion 212c and portion 212e.

[0083] The shear panel 230 is provided below the lower cover 210. The shear panel 230 is provided so as to cover the bottom plate portion 212 of the lower cover 210 from below.

[0084] The shear panel 230 is detachably fixed to the lower cover 210 from the Z2 side. Specifically, the shear panel 230 is fastened to the bottom plate portion 212 of the lower cover 210 by bolts 700. The bolts 700 fasten the end portion 231 of the shear panel 230 on the X1 side and the end portion 232 of the shear panel 230 on the X2 side to the bottom plate portion 212. Note that a plurality of bolts 700 may be arranged side by side in the Y direction at each of the end portions 231 and 232. Note that "detachably fixed" means that objects are fixed so that they can be separated nondestructively. On the other hand, "non-detachably fixed" means that objects are fixed (for example, fixed by welding) so that at least one of the objects is destroyed (for example, the surface is peeled off) when the objects are separated.

[0085] Note that "removably fixed" means fixing objects so that they can be separated non-destructively. For example, when objects are bonded together with an adhesive, the objects can be separated by breaking the adhesive, so adhesion falls under "removably fixed." Also, when fastening objects with fastening members such as bolts and nuts, the objects can be separated by releasing the fastened state of the bolts and nuts, so fastening with bolts and nuts falls under "removably fixed."

[0086] On the other hand, "non-detachably fixed" means that the objects are fixed (for example, by welding) in such a way that at least one of the objects will be destroyed (for example, the surface will peel off) when they are pulled apart. Note that the welded part has continuity at the molecular level between the metal members that are welded together, which is significantly different from the above-mentioned "detachably fixed" case.

[0087] The bolts 700 are provided on the X1 side of the lower cross 211 that is closest to the X1 side among the plurality of lower crosses 211, and on the X2 side of the lower cross 211 that is closest to the X2 side among the plurality of lower crosses 211.

[0088] The shear panel 230 includes a recessed portion 233. The recessed portion 233 is connected to each of the end portion 231 and the end portion 232. The recessed portion 233 is disposed between the end portion 231 and the end portion 232 in the X direction. The recessed portion 233 is formed so as to be recessed (concave) from each of the end portion 231 and the end portion 232 toward the Z2 side.

[0089] In the range overlapping with the energy storage module 100 in the Z direction, a distance D3 in the Z direction between the bottom plate portion 212 of the lower cover 210 and the recessed portion 233 of the share panel 230 is smaller than a distance D2 in the Z direction between the bottom plate portion 212 and the energy storage module 100. For example, the distance D3 may be equal to or less than half the distance D2.

[0090] Fig. 5 is a partially enlarged view of the vicinity of the wall portion 330 in Fig. 3. The wall portion 340 side has the same configuration as Fig. 5, so a repeated description will not be given.

[0091] A through hole 122a through which the bolt 400 passes in the Z direction is formed in the connecting portion 122. A through hole 221f through which the bolt 400 passes in the Z direction is formed in the bottom surface portion 221d of the upper cross 221. The through hole 122a and the through hole 221f overlap in the Z direction.

[0092] The bolt 400 is fastened to a nut 410 and a nut 420. The nut 410 is fastened to a portion 401a of the bolt 400 near the end 401 on the Z1 side. The nut 410 is fixed (welded) to the bottom surface portion 221d of the upper cross 221 from the Z1 side. A washer 411 is provided between the nut 410 and the bottom surface portion 221d.

[0093] The nut 420 is fastened to a portion 402a near the end 402 on the Z2 side of the bolt 400. The nut 420 is fixed to the connecting portion 122 from the Z2 side. A washer 421 is provided between the nut 420 and the connecting portion 122.

[0094] A through hole 231a through which the bolt 700 passes in the Z direction is formed in the end portion 231 of the share panel 230. Furthermore, a through hole 212f through which the bolt 700 passes in the Z direction is formed in the bottom plate portion 212 of the lower cover 210. The through hole 231a and the through hole 212f overlap in the Z direction.

[0095] The bolt 700 is fastened to a nut 710 and a nut 720. The nut 710 is fastened to a portion 701a near the end 701 on the Z1 side of the bolt 700. The nut 710 is fixed (welded) to the surface 212a of the bottom plate portion 212. A washer 711 is provided between the nut 710 and the surface 212a.

[0096] The nut 720 is fastened to a portion 702a near the end 702 on the Z2 side of the bolt 700. The nut 720 is fixed to the end 231 of the shear panel 230 from the Z2 side. A washer 721 is provided between the nut 720 and the end 231.

[0097] In this embodiment, the rigidity of the lower cover 210 (bottom plate portion 212) is higher than the rigidity of the shear panel 230. Specifically, the Z-direction thickness t1 of the bottom plate portion 212 is larger than the Z-direction thickness t2 of the shear panel 230. Note that rigidity may include, for example, bending rigidity.

[0098] Furthermore, the rigidity of the lower cover 210 (bottom plate portion 212) is higher than the rigidity of the upper cover 220 (top plate portion 222). Specifically, the thickness t1 of the bottom plate portion 212 in the Z direction is greater than the thickness t3 of the top plate portion 222 in the Z direction.

[0099] Fig. 6 is a cross-sectional view at a different position in the Y direction from Fig. 3. Specifically, Fig. 6 is a cross-sectional view at a position in the Y direction where the connecting portion 122 is not provided.

[0100] 6, the lower cover 210 is detachably fixed to the upper cover 220. Specifically, the lower cover 210 is fixed to an upper cross 221 from the Z2 side.

[0101] The energy storage device 1 includes a bolt 800. The bolt 800 fastens the bottom plate portion 212 of the lower cover 210 to the upper cross 221 (bottom surface portion 221d). In other words, the bottom plate portion 212 is indirectly fixed to the top plate portion 222 by the bolt 800. The bolt 800 is an example of a "fastening member" in the present disclosure.

[0102] Furthermore, a collar member 213 is provided on the lower cover 210. The collar member 213 extends in the Z direction so as to guide the bolt 800 from the bottom plate portion 212 of the lower cover 210 to the upper cross 221. The collar member 213 is fixed to the bottom plate portion 212 (surface 212a) from the Z1 side by welding or the like.

[0103] The bottom plate portion 212 of the lower cover 210 includes a bottom surface portion 212g and a raised portion 212h. The bolt 800 fastens the raised portion 212h to the upper cross 221. The bottom surface portion 212g is an example of the "cover main body" of the present disclosure.

[0104] The raised portions 212h are recessed upward from the bottom surface 212g. That is, a step is formed between the raised portions 212h and the bottom surface 212g. In the cross section shown in Fig. 6, the bottom surface 212g is provided between the raised portions 212h in the X direction.

[0105] 7, the connection portions 122 of the energy storage modules 100 and the raised portions 212h of the lower cover 210 are arranged alternately in the Y direction. A plurality of raised portions 212h are arranged in the Y direction on the Z2 side of the lower cross 211. The plurality of raised portions 212h are arranged at equal intervals in the Y direction.

[0106] Fig. 8 is a partially enlarged view of the vicinity of the wall portion 330 in Fig. 6. The wall portion 340 side has the same configuration as Fig. 8, so a repeated description will not be given.

[0107] A through-hole 221g is formed in the bottom surface 221d of the upper cross 221, through which the bolt 800 passes in the Z direction.

[0108] The raised portion 212h of the lower cover 210 is formed with a through-hole 212i through which the bolt 800 passes in the Z direction.

[0109] The upper surface 211d of the lower cross 211 is formed with a through-hole 211f through which the bolt 800 passes in the Z direction.

[0110] The through holes 221g, 212i, and 211f overlap in the Z direction. The bolt 800 passes through the through holes 221g, 212i, and 211f, and extends from the Z2 side of the raised portion 212h to the Z1 side of the bottom surface portion 221d of the upper cross 221.

[0111] The bolt 800 is fastened to each of a nut 810 and a nut 820. The nut 810 is fastened to a portion 801a of the bolt 800 near the end 801 on the Z1 side. The nut 810 is fixed (welded) to the bottom surface portion 221d of the upper cross 221 from the Z1 side. A washer 811 is provided between the nut 810 and the bottom surface portion 221d. The nut 820 is an example of a "fastening member" in the present disclosure.

[0112] The nut 820 is fastened to a portion 802a near the end 802 on the Z2 side of the bolt 800. The nut 820 is fixed to the raised portion 212h from the Z2 side. A washer 821 is provided between the nut 820 and the raised portion 212h. The washer 821 is an example of the "fastening member" of the present disclosure.

[0113] The nut 820 and the washer 821 are each housed in a space formed between the bottom plate portion 212 of the lower cover 210 and the shear panel 230.

[0114] An annular sealing member 830 (made of, for example, rubber) is provided between the washer 821 and the raised portion 212h. The sealing member 830 is sandwiched between the washer 821 and the raised portion 212h in the Z direction. The bolt 800 passes through the sealing member 830.

[0115] The end 802 of the bolt 800 is disposed at the same position in the Z direction as the lower surface 212j of the bottom surface portion 212g of the lower cover 210. In this embodiment, the end 802 of the bolt 800 is provided at the same position in the Z direction as the lower surface (not numbered) of the nut 820.

[0116] The collar member 213 has a through hole 213a through which the bolt 800 passes in the Z direction. The collar member 213 is formed to extend in the Z direction. For example, the collar member 213 has a cylindrical shape. The collar member 213 may have a shape other than a cylindrical shape (for example, a rectangular tube shape). The collar member 213 is made of a metal such as aluminum. The collar member 213 may also be made of a resin or the like.

[0117] A lower end 213b of the collar member 213 is in contact with the raised portion 212h of the lower cover 210. An upper end 213c of the collar member 213 is in contact with the bottom surface 221d of the upper cross member 221. The collar member 213 passes through a through-hole 211f in the top surface 211d of the lower cross member 211 and extends from the raised portion 212h of the lower cover 210 to the bottom surface 221d of the upper cross member 221.

[0118] The collar member 213 is provided to guide (protect) the bolt 800. This makes it possible to prevent the bolt 800 from coming into contact with the power storage module 100 or the like due to vibration or the like.

[0119] Furthermore, since the lower end 213b of the collar member 213 is in contact with the raised portion 212h of the lower cover 210, it is possible to distribute the force applied to the raised portion 212h due to an impact from below, etc., between the lower cross 211 and the collar member 213. This reduces the stress applied to the contact surface between the lower cross 211 and the raised portion 212h compared to when the collar member 213 is not provided. This makes it possible to prevent, for example, the portion of the raised portion 212h below the lower cross 211 from being depressed (collapsed) upward.

[0120] The upper surface 211d of the lower cross 211 and the outer peripheral surface 213d of the collar member 213 are joined by, for example, arc welding. Specifically, a surface 211g of the upper surface 211d of the lower cross 211 on the Z1 side is welded to the outer peripheral surface 213d of the collar member 213. A welded portion 211h at which the surface 211g and the outer peripheral surface 213d are welded may be formed in an annular shape so as to surround the collar member 213 when viewed from the Z1 side.

[0121] <How to remove the lower cover> Next, an example of a method for removing the lower cover 210 will be described with reference to FIG. 9 . In step S1, the bolts 700 fastening the shear panel 230 and the lower cover 210 (bottom plate portion 212) together are removed. In step S2, the shear panel 230 is removed (retracted) from the lower cover 210. In step S3, the rivets 600 and 610 fastening the frame 300 and the lower cover 210 together are removed. In step S4, the sealing members 500 and 510 are cut using a cutter or the like. In step S5, the bolts 800 fastening the upper cross 221 and the lower cover 210 (bottom plate portion 212) are removed. In step S6, the lower cover 210 is removed (retracted) from the upper cover 220 (upper cross 221). As a result, the lower cover 210 is removed with the power storage module 100 held by the upper cover 220.

[0122] Fig. 10 is a diagram showing the process of step S4 in Fig. 9. In Fig. 10, each of the seal members 500 and 510 is divided into two parts in the vertical direction by a cutter 900.

[0123] Fig. 11 is a diagram showing the process of step S5 in Fig. 9. In this process, the bolt 800 is pulled out downward from the collar member 213.

[0124] Fig. 12 is a diagram showing the process of step S6 in Fig. 9. In this process, the lower cover 210 (bottom plate portion 212, lower cross 211) is moved downward.

[0125] As described above, in this embodiment, the power storage module 100 is fixed to the upper cover 220, and the lower cover 210 is detachably fixed to the upper cover 220. As a result, the power storage module 100 is held by the upper cover 220, and therefore, when the lower cover 210 is removed from the upper cover 220, the power storage module 100 can be prevented from being removed from the vehicle 10 together with the lower cover 210. As a result, the lower cover 210 can be easily removed. Furthermore, the lower cover 210 can be repaired or replaced without removing the power storage module 100 from the vehicle 10.

[0126] Furthermore, in this embodiment, in the range where the lower cover 210 and the power storage module 100 overlap in the Z direction, the distance D3 in the Z direction between the lower cover 210 and the share panel 230 is smaller than the distance D2 in the Z direction between the lower cover 210 and the power storage module 100. This makes it easy to increase the space between the lower cover 210 and the power storage module 100, so that the space for discharging smoke from the power storage module 100 and the space for absorbing impacts from below can be shared. As a result, the space efficiency of the vehicle 10 can be improved compared to when the above two spaces are provided separately.

[0127] In the above embodiment, the Y-direction position at which the connecting portion 122 is provided on the side surface portion 121a of the upper cross 221 is the same as the Y-direction position at which the connecting portion 122 is provided on the side surface portion 121b of the upper cross 221, but the present disclosure is not limited to this. The above positions may be different from each other.

[0128] In the example shown in FIG. 13 , the energy storage device 2 includes a plurality of energy storage modules 101. Each of the plurality of energy storage modules 101 includes a cell case 125 that houses a plurality of energy storage cells 110. The cell case 125 has a case main body 126 and eight connection portions 122. Four of the eight connection portions 122 protrude toward the X1 side from a side surface portion 126a on the X1 side of the case main body 126. The remaining four of the eight connection portions 122 protrude toward the X2 side from a side surface portion 126b on the X2 side of the case main body 126.

[0129] The four connecting portions 122 of the side surface portion 126a and the four connecting portions 122 of the side surface portion 126b are arranged at different positions (coordinates) in the Y direction. That is, none of the four connecting portions 122 of the side surface portion 126a is arranged at the same position in the Y direction as any of the four connecting portions 122 of the side surface portion 126b.

[0130] In this configuration, unlike the above embodiment, the orientation of the multiple power storage modules 101 in the Y direction is the same, which prevents the connecting portions 122 of the power storage modules 101 adjacent to each other in the X direction from coming into contact with each other.

[0131] In the above embodiment, an example has been described in which the lower cover 210 (bottom plate portion 212) is fastened to the upper cover 220 (upper cross 221) with the bolt 800, but the present disclosure is not limited to this. The lower cover may be fixed to the upper cover with an adhesive. For example, in a configuration in which the outer peripheral edge of the bottom plate portion of the lower cover and the outer peripheral edge of the top plate portion of the upper cover are arranged adjacent to each other in the Z direction, the outer peripheral edges may be bonded to each other with an adhesive. Alternatively, the upper cross may be formed to extend to the bottom plate portion of the lower cover, and the upper cross and the bottom plate portion may be bonded to each other with an adhesive. Alternatively, the bottom plate portion 212 of the lower cover 210 and the top plate portion 222 of the upper cover 220 may be fastened to each other with a bolt.

[0132] In the above embodiment, an example has been described in which the power storage module 100 (connecting portion 122) and the upper cover 220 (upper cross 221) are fastened together with the bolts 400, but the present disclosure is not limited to this. The connecting portion 122 may be fixed to the upper cross 221 with an adhesive. Furthermore, the power storage module 100 may be fixed to the top plate portion 222 of the upper cover 220. In this case, the upper cover does not necessarily have to be provided with the upper cross 221.

[0133] In the above embodiment, an example has been described in which the shared panel 230 is provided in the power storage device 1, but the present disclosure is not limited to this. The power storage device does not necessarily have to be provided with the shared panel 230. In this case, the lower surface of the bottom plate portion 212 of the lower cover 210 may be coated.

[0134] In the above embodiment, an example was shown in which the thickness t1 of the lower cover 210 (bottom plate portion 212) is greater than the thickness t2 of the shear panel 230, thereby making the rigidity of the lower cover 210 (bottom plate portion 212) greater than the rigidity of the shear panel 230, but the present disclosure is not limited to this. The lower cover may be formed of a material that is more rigid than the shear panel. Furthermore, the lower cover may have a bead or the like formed thereon, thereby making the rigidity of the lower cover greater than the rigidity of the shear panel. Furthermore, the rigidity of the lower cover and the rigidity of the upper cover may also be similar to these modified examples.

[0135] In the above embodiment, an example has been shown in which the shear panel 230 is detachably fixed to the lower cover 210, but the present disclosure is not limited to this. The shear panel 230 may also be non-detachably fixed to the lower cover 210 by welding or the like.

[0136] In the above embodiment, an example has been described in which the upper cross 221 extends downward from the top plate portion 222, but the present disclosure is not limited to this. The upper cross does not have to extend downward from the top plate portion 222. For example, the lower end of the upper cross may be located above the power storage module.

[0137] Although an example has been shown in which the portion where the lower cover 210 (bottom plate portion 212) and the frame 300 (wall portions 330 and 340) are fixed is located below the energy storage module 100, the present disclosure is not limited to this. The portion may be located at the same position as the bottom portion 123 of the energy storage module 100 or above the bottom portion 123 in the Z direction.

[0138] In the above embodiment, an example has been shown in which the end 802 of the bolt 800 is provided at the same position in the Z direction as the lower surface 212j (FIG. 8) of the bottom surface portion 212g of the lower cover 210, but the present disclosure is not limited to this. As shown in FIG. 14, the end 802 may be located higher than the lower surface 212l of the bottom surface portion 212k. The bottom surface portion 212k and the lower surface 212l are examples of the "cover main body" and the "lower surface" of the present disclosure, respectively.

[0139] In the above embodiment, an example (FIG. 7) has been shown in which a plurality of raised portions 212h are arranged in the Y direction, but the present disclosure is not limited to this. A single raised portion may be formed to extend in the Y direction below the lower cross member 211. For example, the raised portion may extend in the Y direction from the end position on the Y1 side of the lower cross member 211 to the end position on the Y2 side.

[0140] In the above embodiment, an example has been described in which the power storage device 1 is disposed on the underbody 11a of the vehicle 10, but the present disclosure is not limited to this. The power storage device 1 may also be disposed on the bottom of an electrical device other than a vehicle (for example, a stationary power storage device).

[0141] In the above embodiment, an example has been described in which the lower cover 210 (bottom plate portion 212) and the frame 300 (wall portions 330 and 340) are fixed together by the sealing member 500 (510) and the rivet 600 (610), but the present disclosure is not limited to this. For example, the sealing member may not have adhesive properties, and the lower cover 210 and the frame 300 may be fixed together only by fastening members. In this case, the sealing member may be provided near (adjacent to) the fastening members.

[0142] In the above embodiment, an example was shown in which the frame 300 is configured by four walls (310, 320, 330, and 340), but the present disclosure is not limited to this. For example, the frame may be formed by a single plate-like member formed in a frame shape. Also, two plate-like members formed in an L-shape may be combined.

[0143] The configurations of the above-described embodiment and the various modified examples may be combined with each other.

[0144] (Reference example) In the above-described embodiment and various modified examples, the lower cover is detachably fixed to the upper cover. However, it is also possible for the lower cover to be detachably fixed to the power storage module. In this case, too, it is possible to remove the lower cover without removing the power storage module.

[0145] 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]

[0146] 1, 2 Energy storage device, 10 Vehicle, 11 Vehicle body, 11a Underbody (bottom), 100, 101 Energy storage module, 200 Case, 210 Lower cover (second cover), 220 Upper cover (first cover), 230 Share panel (third cover), 212g, 212k Bottom surface (cover body), 212h Raised portion, 212j, 212l Lower surface (lower surface of cover body), 221 Upper cross (fixing portion), 222 Top plate portion, 300 Frame (frame member), 500, 510 Seal member, 800 Bolt (fastening member), 802 End (end of fastening member), 820 Nut (fastening member), 821 Washer (fastening member), D1 Distance (distance between first cover and second cover), D2 distance (distance between the second cover and the storage module), D3 distance (distance between the second cover and the third cover).

Claims

1. a power storage module including a plurality of power storage cells; a case that houses the power storage module, The case is a first cover that covers the power storage module from above; a second cover that covers the power storage module from below, the power storage module is fixed to the first cover, The second cover is detachably fixed to the first cover.

2. a third cover provided below the second cover; The power storage device according to claim 1 , wherein the second cover has a rigidity higher than that of the third cover.

3. The power storage device according to claim 2 , wherein the third cover is detachably fixed to the second cover from below.

4. 4. The energy storage device according to claim 2, wherein the vertical distance between the second cover and the third cover is smaller than the vertical distance between the second cover and the energy storage module in the range where the second cover and the third cover overlap in the vertical direction.

5. The first cover is a top panel portion located above the power storage module; a fixing portion provided on the top plate portion, the power storage module is fixed to the fixing portion, 4. The power storage device according to claim 1, wherein the second cover is fixed to the fixing portion from below.

6. The power storage device according to claim 5 , wherein the fixing portion is provided so as to extend downward from the top plate portion.

7. a frame member disposed to surround the fixing portion and the energy storage module; a seal member that seals between the frame member and the second cover, each of the first cover and the second cover is fixed to the frame member; The power storage device according to claim 5 , wherein the sealing member is provided near a location where the second cover and the frame member are fixed together.

8. The power storage device according to claim 7 , wherein the second cover is fixed to the frame member below the power storage module.

9. a fastening member for fastening the second cover and the fixing portion, The second cover is The cover body, a raised portion formed to be recessed upward from the cover body, The power storage device according to claim 5 , wherein the fastening member fastens the protruding portion and the fixing portion together.

10. The power storage device according to claim 9 , wherein the fastening member is arranged such that a lower end of the fastening member is positioned at the same position as a lower surface of the cover body or higher than the lower surface in the vertical direction.

11. 4. The power storage device according to claim 1, wherein the second cover has a rigidity greater than that of the first cover.

12. The energy storage device according to any one of claims 1 to 3, wherein in a range where the first cover overlaps the energy storage module in the vertical direction, the vertical distance between the first cover and the energy storage module is smaller than the vertical distance between the second cover and the energy storage module.

13. The car body and A vehicle comprising: the power storage device according to any one of claims 1 to 3, which is fixed to a bottom of the vehicle body.

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