Electricity storage device and vehicle

Abstract

To provide an electricity storage device, in which a pressure release valve and a respiration film are provided in a case, which can suppress an adverse effect due to spark or smoke from an electricity storage stack from occurring.SOLUTION: An electricity storage device 1 comprises an electricity storage module 200 which includes a first electricity storage stack 210 and a second electricity storage stack 220 which are arranged with an interval D in a Y-direction, a case 100 in which the electricity storage module 200 is stored, a pressure release valve 300, and a respiration film 400. The case 100 includes an upper cover 110 provided to cover the electricity storage module 200 from above. Recessed parts (111 and 112) recessed downward toward a space S1 between the first electricity storage stack 210 and the second electricity storage stack 220 are formed in the upper cover 110. The pressure release valve 300 and the respiration film 400 are arranged on the recessed part 111 and the recessed part 112 respectively.SELECTED DRAWING: Figure 2

Description

[Technical Field]

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

[0002] International Publication No. 2020-134054 (Patent Document 1) discloses a power battery pack including a battery module composed of multiple cells and a battery tray in which the battery module is arranged (housed). The battery tray is provided with an exhaust hole for exhausting gas (smoke) generated from the cells. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2020-134054 Summary of the Invention [Problem to be solved by the invention]

[0004] Although not described in Patent Document 1, the pressure release valve (exhaust hole) and breathing membrane may be provided on the upper cover of the battery tray (case). In this case, when sparks or smoke occur in the cell (electricity storage stack), sparks may be released from the pressure release valve to the outside of the battery tray, or the breathing membrane may be affected by heat from the sparks or smoke from the battery stack.

[0005] The present disclosure has been made to solve the above-mentioned problems, and its purpose is to provide an energy storage device and a vehicle that can suppress the adverse effects caused by sparks and smoke from the energy storage stack when a pressure release valve and a breathing membrane are provided in the case. [Means for solving the problem]

[0006] A power storage device according to a first aspect of the present disclosure includes a power storage module including a first power storage stack and a second power storage stack spaced apart in a direction intersecting the vertical direction, a case that houses the power storage module, a pressure release valve provided in the case, and a breathing membrane. The case includes a lower case that supports the power storage module from below, and an upper cover that covers the power storage module from above. The upper cover has a recess that recesses downward toward a space between the first power storage stack and the second power storage stack. The pressure release valve and the breathing membrane are each located in the recess.

[0007] In the power storage device according to the first aspect of the present disclosure, as described above, the pressure release valve and the breathing membrane are each disposed in a recess recessed downward toward the space between the first power storage stack and the second power storage stack. This allows the side surface (surface extending in the vertical direction) forming the recess to prevent at least some of the sparks and smoke generated from each of the first power storage stack and the second power storage stack from scattering. As a result, it is possible to prevent sparks and smoke from being directly scattered (sprayed) from each of the first power storage stack and the second power storage stack toward the pressure release valve and the breathing membrane. This makes it possible to suppress adverse effects caused by sparks and smoke from the power storage stacks.

[0008] Furthermore, since the pressure release valve and the breathing membrane are each provided in the recess, the height positions of the upper end of the pressure release valve and the upper end of the breathing membrane can be lowered.

[0009] In the above-described power storage device according to the first aspect, the upper cover preferably has a first recess in which the pressure release valve is disposed and a second recess in which the breathing membrane is disposed. The first recess is provided at a position spaced apart from the second recess. With this configuration, the breathing membrane can be disposed at a position spaced apart from the pressure release valve. As a result, even if air enters the case from outside the case through the pressure release valve, an increase in the oxygen ratio around the breathing membrane can be suppressed. This reduces the thermal effect on the breathing membrane.

[0010] In the above-described power storage device according to the first aspect, each of the first power storage stack and the second power storage stack preferably includes a bus bar provided on a side of a space between the first power storage stack and the second power storage stack. The bus bar is covered with a heat insulating material. With this configuration, even if smoke circulates through the space, it is possible to suppress the thermal effect of smoke on the bus bar.

[0011] 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, thereby providing a vehicle that can suppress adverse effects caused by sparks and smoke from the power storage stack.

[0012] In the vehicle according to the second aspect, the vehicle body preferably includes an underbody in which the power storage device is disposed. The underbody has an enclosing portion, at least a portion of which is recessed in the recess and which is provided to enclose at least one of the pressure release valve and the breathing membrane. With this configuration, the enclosing portion can fill the area around at least one of the pressure release valve and the breathing membrane with smoke. As a result, an increase in the oxygen ratio around at least one of the pressure release valve and the breathing membrane can be suppressed.

[0013] In this case, preferably, the upper cover includes a top plate portion. The recess is recessed downward from the top plate portion. A slit is formed in the surrounding portion. An upper end of the slit is located above the top plate portion. With this configuration, even if water flows into the recess, the water can be discharged from the recess to the top plate portion through the slit.

[0014] In the vehicle in which the upper cover includes the top plate portion, the upper end of the pressure release valve and the upper end of the breathing membrane are preferably located above the top plate portion, so that the pressure release valve and the breathing membrane can be prevented from being submerged in water.

[0015] In the vehicle according to the second aspect, the vehicle body preferably includes an underbody in which the power storage device is disposed. The vehicle is provided with a sealing member that seals a gap between the case and the underbody. The sealing member is disposed so as to surround the pressure release valve. A vent is formed in the sealing member. With this configuration, the area around the pressure release valve can be filled with smoke by the sealing member. As a result, an increase in the oxygen ratio around the pressure release valve can be suppressed. Furthermore, since the vent is formed in the sealing member, an excessive increase in pressure around the pressure release valve due to smoke can be suppressed.

[0016] In this case, the breathing membrane is preferably disposed at a second position on one side of the first position where the pressure release valve is disposed in the predetermined direction. The ventilation part is disposed at a third position between the first and second positions in the predetermined direction. With this configuration, smoke discharged from the pressure release valve can be circulated toward the breathing membrane. As a result, an increase in the oxygen ratio around the breathing membrane can be suppressed. [Effects of the Invention]

[0017] According to the present disclosure, when a pressure release valve and a breathing membrane are provided in the case, adverse effects caused by sparks and smoke from the power storage stack can be suppressed. [Brief explanation of the drawings]

[0018] [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 perspective view illustrating a configuration of an electricity storage device according to an embodiment. [Figure 3] 1 is a perspective view showing a configuration of an electricity storage device according to an embodiment with an upper cover removed; [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 2. [Figure 5] FIG. 3 is a cross-sectional view taken along line VV in FIG. [Figure 6]FIG. 2 is a perspective view of an underbody enclosure according to one embodiment, viewed from below. [Figure 7] FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. [Figure 8] FIG. 10 is a perspective view showing a configuration in the vicinity of a recess in an electricity storage device according to a modified example of the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0019] 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.

[0020] 1 is a diagram showing a vehicle 900 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 900. The vehicle 900 includes, for example, a plug-in hybrid electric vehicle (PHEV), a battery electric vehicle (BEV), or a fuel cell electric vehicle (FCEV).

[0021] 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 900, respectively. The Z direction may be the up-down (vertical) direction. The X direction and Y direction are examples of a "predetermined direction" and a "direction intersecting with the up-down direction," respectively, in the present disclosure. The Z direction is an example of the "up-down direction" in the present disclosure.

[0022] The vehicle 900 includes a vehicle body 910 in addition to the power storage device 1. The vehicle body 910 has an underbody 920. The underbody 920 is provided on a lower part (bottom) of the vehicle body 910. The power storage device 1 is arranged in the underbody 920. Specifically, the power storage device 1 is fixed (fastened) to the underbody 920 below the underbody 920.

[0023] As shown in FIGS. 2 and 3, the electricity storage device 1 includes a case 100, an electricity storage module 200 (see FIG. 3), a pressure release valve 300, a breathing membrane 400, and a sealing member 500.

[0024] As shown in Fig. 2, the case 100 includes an upper cover 110 and a lower case 120. The upper cover 110 is disposed on the Z1 side (above) of the lower case 120. The upper cover 110 is provided so as to cover (lid) the lower case 120 from the Z1 side. When the upper cover 110 is assembled to the lower case 120, an accommodation space for the case 100 is formed. The power storage module 200 (see Fig. 3) is disposed in the accommodation space.

[0025] That is, the upper cover 110 is provided to cover the power storage module 200 from the Z1 side. The lower case 120 supports the power storage module 200 from the Z2 side. The peripheral edge of the upper cover 110 is fixed to the upper end of a peripheral wall 122 (described later, see FIG. 3) of the lower case 120 by bolts or the like.

[0026] FIG. 3 is a perspective view showing the energy storage device 1 with the upper cover 110 removed from the lower case 120. As shown in FIG.

[0027] 3, the energy storage module 200 includes a plurality of first energy storage stacks 210, a plurality of second energy storage stacks 220, a first bus bar 230, a second bus bar 240, a first junction box 250, and a second junction box 260. Each of the first bus bar 230 and the second bus bar 240 is an example of a "bus bar" in the present disclosure.

[0028] The multiple first power storage stacks 210 are arranged side by side in the X direction. In this embodiment, the multiple first power storage stacks 210 include six first power storage stacks 210. However, the number of first power storage stacks 210 is not limited to six. Each first power storage stack 210 has a rectangular parallelepiped shape that is long in the Y direction orthogonal to both the X direction and the Z direction.

[0029] Each first power storage stack 210 includes a plurality of power storage cells 211 (see FIG. 4). The plurality of power storage cells 211 are arranged, for example, lined up in the Y direction. The plurality of power storage cells 211 may also be arranged, for example, lined up in the X direction. Each power storage cell 211 is formed in a flat rectangular parallelepiped shape. An example of each power storage cell 211 is a lithium ion battery. Each power storage cell 211 may be formed as an all-solid-state battery using a solid electrolyte. Each power storage cell 211 has a safety valve 211a (see FIG. 4) provided at a position facing the upper cover 110.

[0030] Each second power storage stack 220 includes a plurality of power storage cells 221 (see FIG. 4). The plurality of power storage cells 221 are arranged, for example, lined up in the Y direction. The plurality of power storage cells 221 may also be arranged, for example, lined up in the X direction. Each power storage cell 221 is formed in a flat rectangular parallelepiped shape. An example of each power storage cell 221 is a lithium ion battery. Each power storage cell 221 may be formed as an all-solid-state battery using a solid electrolyte. Each power storage cell 221 has a safety valve 221a (see FIG. 4) provided at a position facing the upper cover 110.

[0031] As shown in FIG. 3 , the plurality of second power storage stacks 220 face the plurality of first power storage stacks 210 in the Y direction. The plurality of second power storage stacks 220 include six second power storage stacks 220. Six pairs of a first power storage stack 210 and a second power storage stack 220 aligned in the Y direction are arranged side by side in the X direction. The first power storage stacks 210 and the second power storage stacks 220 are arranged at a predetermined interval D in the Y direction. That is, a space S1 (see FIG. 4 ) is provided between the first power storage stack 210 and the second power storage stack 220. The number of second power storage stacks 220 is not limited to six. The configuration of each second power storage stack 220 is the same as the configuration of the first power storage stack 210.

[0032] The first bus bar 230 connects the first power storage stacks 210 adjacent to each other in the X direction. The first bus bar 230 is provided on the space S1 (see FIG. 4) side. Specifically, the first bus bar 230 is routed in a routing space S2 (see FIG. 4) between the plurality of first power storage stacks 210 and the plurality of second power storage stacks 220. The routing space S2 is part of the space S1.

[0033] The second bus bar 240 connects the second power storage stacks 220 adjacent to each other in the X direction. The first bus bar 230 is provided on the space S1 (see FIG. 4) side. Specifically, the second bus bar 240 is routed in the routing space S2 (see FIG. 4).

[0034] The first power storage stack 210 closest to the X2 side among the plurality of first power storage stacks 210 and the second power storage stack 220 closest to the X2 side among the plurality of second power storage stacks 220 are connected by a bus bar (not shown). As a result, the plurality of first power storage stacks 210 and the plurality of second power storage stacks 220 are electrically connected in series.

[0035] The first junction box 250 is disposed at a position facing in the X direction (specifically, on the X1 side) the first power storage stack 210 that is closest to the X1 side among the multiple first power storage stacks 210. The first junction box 250 houses a relay, a fuse, and the like. The first junction box 250 has a first connector 251. The first connector 251 protrudes outward in the X direction.

[0036] The second junction box 260 is disposed at a position facing in the X direction (specifically, on the X1 side) the second power storage stack 220 that is closest to the X1 side among the multiple second power storage stacks 220. The second junction box 260 is disposed at a position facing the first junction box 250 at an interval in the Y direction. The second junction box 260 houses a relay, a fuse, and the like. The second junction box 260 has a second connector 261. The second connector 261 protrudes outward in the X direction.

[0037] The lower case 120 is open upward and has a bottom wall 121, a peripheral wall 122, and a partition portion 123.

[0038] The bottom wall 121 is disposed on the Z2 side of the power storage module 200. The bottom wall 121 supports the power storage module 200 from the Z2 side.

[0039] The peripheral wall 122 stands upright from the peripheral edge of the bottom wall 121. The peripheral wall 122 surrounds the periphery of the plurality of first power storage stacks 210 and the plurality of second power storage stacks 220. The peripheral wall 122 is formed in a substantially rectangular cylindrical shape.

[0040] The partition 123 separates the plurality of first power storage stacks 210 from the plurality of second power storage stacks 220. The partition 123 has a shape that extends along the X direction. The height of the partition 123 is smaller than the height of the peripheral wall 122.

[0041] The pressure release valve 300 (see FIG. 2) is provided in the case 100. The pressure release valve 300 releases the pressure inside the case 100. The pressure release valve 300 opens when the pressure inside the case 100 reaches or exceeds a reference value. The pressure release valve 300 is configured as a check valve.

[0042] The breathing membrane 400 (see FIG. 2) is provided on the case 100. The breathing membrane 400 adjusts the pressure inside the case 100 by allowing gas to pass between the inside and outside of the case 100.

[0043] As shown in FIG. 2, the pressure relief valve 300 and the breathing membrane 400 are each provided on the upper cover 110.

[0044] Here, the power storage stack may emit sparks or smoke if the temperature rises excessively. Specifically, the sparks and smoke are emitted from the safety valve of the power storage cell. In this case, it is possible that sparks are emitted to the outside of the case through the pressure release valve, or that the breathing membrane is affected by the heat caused by the sparks and smoke from the power storage stack.

[0045] Therefore, in this embodiment, as shown in Fig. 4, the upper cover 110 is formed with a recess 111 that is recessed downward toward the space S1 between the first power storage stack 210 and the second power storage stack 220. The pressure release valve 300 is provided in the recess 111. The recess 111 is an example of a "first recess" in the present disclosure.

[0046] 5, the upper cover 110 is formed with a recess 112 that is recessed downward toward the space S1 between the first power storage stack 210 and the second power storage stack 220. The breathing membrane 400 is provided in the recess 112. The recess 112 is an example of a "second recess" in the present disclosure.

[0047] First, the recess 111 will be described in detail with reference to Fig. 4. The upper cover 110 is provided with a bottom surface portion 111a and a plurality of side surfaces 111b that form the recess 111.

[0048] The pressure release valve 300 is disposed (placed) on the bottom surface portion 111a. A through-hole 111c is provided in the bottom surface portion 111a to discharge smoke and the like generated in the power storage cells (211, 221). The pressure release valve 300 is disposed on the bottom surface portion 111a so as to close the through-hole 111c from the Z1 side. The bottom surface portion 111a extends perpendicular to the Z direction. In the Z direction, the bottom surface portion 111a is provided below (on the Z2 side) the position of the upper end portion 210a of the first power storage stack 210 and the position of the upper end portion 220a of the second power storage stack 220.

[0049] Each of the multiple (four in this embodiment) side surfaces 111b is provided to extend (stand up) from the outer periphery of the bottom surface 111a toward the Z1 side. The pressure release valve 300 is surrounded by the four side surfaces 111b. The recess 111 is a rectangular parallelepiped space formed by the bottom surface 111a and the four side surfaces 111b. The shape of the recess 111 is not limited to the above example. For example, the recess 111 may be a cylindrical space.

[0050] The upper cover 110 includes a top plate portion 113. The top plate portion 113 is a flat plate-like member that forms the upper end surface of the upper cover 110. The recessed portion 111 is recessed downward (toward the Z2 side) from the top plate portion 113. Specifically, the top plate portion 113 has a first covering portion 113a that covers the multiple first power storage stacks 210 and a second covering portion 113b that covers the multiple second power storage stacks 220. Each of the first covering portion 113a and the second covering portion 113b is formed in a flat plate shape. The recessed portion 111 is provided between the first covering portion 113a and the second covering portion 113b. The recessed portion 111 is recessed downward from each of the first covering portion 113a and the second covering portion 113b. In other words, the recessed portion 111 is recessed downward from each of the first covering portion 113a and the second covering portion 113b toward the space S1.

[0051] Each of the side surface portions 111b is provided to extend downward from the top panel portion 113 toward the bottom surface portion 111a. The side surface portion 111b on the Y1 side extends downward from the first covering portion 113a toward the bottom surface portion 111a. The side surface portion 111b on the Y2 side extends downward from the second covering portion 113b toward the bottom surface portion 111a.

[0052] The top plate portions 113 (113a, 113b) are disposed above (on the Z1 side of) the position where the upper end portion 210a of the first power storage stack 210 is provided and the position where the upper end portion 220a of the second power storage stack 220 is provided in the Z direction. Note that the position where the first covering portion 113a is provided and the position where the second covering portion 113b is provided are the same in the Z direction. The first covering portion 113a is provided so as to face the upper end portion 210a in the Z direction. The second covering portion 113b is provided so as to face the upper end portion 220a in the Z direction.

[0053] As described above, by providing the recess 111 in the upper cover 110, it is possible to cause sparks from the electricity storage stack (210, 220) to fly to the side surface portion 111b and the top plate portion 113. As a result, it is possible to prevent sparks from flying to the pressure release valve 300.

[0054] The pressure release valve 300 has an upper end portion 310. In the Z direction, the upper end portion 310 is disposed on the Z1 side of the position where the top plate portion 113 is provided. In other words, the pressure release valve 300 protrudes from the recessed portion 111 to the Z1 side.

[0055] An enclosing portion 921 is provided on an underbody 920 of the vehicle 900. The enclosing portion 921 is provided so as to protrude from a floor panel 920a of the underbody 920 to the Z2 side. A tip portion 921a of the enclosing portion 921 on the Z2 side is recessed into the recess 111. Note that the enclosing portion 921 is not in contact with either the side surface portion 111b or the bottom surface portion 111a of the recess 111. Furthermore, the tip portion 921a is provided on each of side wall portions 921b to 921e, which will be described later.

[0056] Next, the recess 112 will be described in detail with reference to Fig. 5. The upper cover 110 is provided with a bottom surface portion 112a and a plurality of side surfaces 112b that form the recess 112.

[0057] The breathing membrane 400 is disposed (placed) on the bottom surface portion 112a. The bottom surface portion 112a is provided with through-holes 112c for discharging smoke and the like generated in the power storage cells (211, 221). The breathing membrane 400 is disposed on the bottom surface portion 112a so as to close the through-holes 112c from the Z1 side. The bottom surface portion 112a extends perpendicular to the Z direction. In the Z direction, the bottom surface portion 112a is provided below (on the Z2 side) the position where the upper end portion 210a of the first power storage stack 210 is provided and the position where the upper end portion 220a of the second power storage stack 220 is provided.

[0058] Each of the multiple (four in this embodiment) side portions 112b is provided so as to extend (stand up) from the outer periphery of the bottom portion 112a toward the Z1 side. The breathing membrane 400 is surrounded by the four side portions 112b. The recess 112 is a rectangular parallelepiped space formed by the bottom portion 112a and the four side portions 112b. The shape of the recess 112 is not limited to the above example. For example, the recess 112 may be a cylindrical space.

[0059] The recess 112 is recessed downward (toward the Z2 side) from the top plate portion 113. The recess 112 is provided between the first covering portion 113a and the second covering portion 113b. The recess 112 is recessed downward from each of the first covering portion 113a and the second covering portion 113b. In other words, the recess 112 is recessed downward from each of the first covering portion 113a and the second covering portion 113b toward the space S1.

[0060] Each of the side surface portions 112b is provided to extend downward from the top panel portion 113 toward the bottom surface portion 112a. The side surface portion 112b on the Y1 side extends downward from the first covering portion 113a toward the bottom surface portion 112a. The side surface portion 112b on the Y2 side extends downward from the second covering portion 113b toward the bottom surface portion 112a.

[0061] As described above, the recess 112 provided in the upper cover 110 allows sparks from the power storage stack (210, 220) to fly to the side surface portion 112b and the top plate portion 113. As a result, it is possible to prevent sparks from flying to the breathing film 400. In addition, it is possible to allow smoke from the power storage stack (210, 220) to flow along the side surface portion 112b and the top plate portion 113 and move to the bottom surface portion 112a (breathing film 400) (see the dashed-dotted line in FIG. 5). Therefore, it is possible to prevent smoke from flying (being blown) directly from the power storage stack (210, 220) to the bottom surface portion 112a (breathing film 400). This makes it possible to prevent thermal effects caused by smoke from occurring in the breathing film 400.

[0062] The breathing film 400 has an upper end portion 410. In the Z direction, the upper end portion 410 is disposed on the Z1 side of the position where the top plate portion 113 is provided. In other words, the breathing film 400 protrudes from the recessed portion 112 on the Z1 side.

[0063] An enclosing portion 922 is provided on an underbody 920 of the vehicle 900. The enclosing portion 922 is provided so as to protrude from a floor panel 920a of the underbody 920 to the Z2 side. A tip end 922a of the enclosing portion 922 on the Z2 side is recessed into the recess 112. Note that the enclosing portion 922 is not in contact with either the side surface portion 112b or the bottom surface portion 112a of the recess 112. Furthermore, the tip end 922a is provided on each of side wall portions 922b to 922e, which will be described later.

[0064] As shown in FIG. 6, the surrounding portion 921 and the surrounding portion 922 are arranged side by side in the X direction.

[0065] The surrounding portion 921 has a side wall portion 921b, a side wall portion 921c, a side wall portion 921d, and a side wall portion 921e. The side wall portions 921b to 921e are provided on the Y2 side, the X2 side, the Y1 side, and the X1 side of the pressure release valve 300, respectively. In other words, the pressure release valve 300 is surrounded on all sides by the side wall portions 921b to 921e.

[0066] A slit 921f is provided in the side wall portion 921b. The slit 921f is provided in the side wall portion 921b so as to extend from the Z-direction position where the tip portion 921a is provided (i.e., the lower end portion of the side wall portion 921b) to the Z1 side. That is, the slit 921f is open on the lower side (Z2 side). The slit 921f may be provided in any one of the side wall portions 921c to 921e. The slit 921f may also be provided in two or more of the side wall portions 921b to 921e.

[0067] The surrounding portion 921 is open on the Z2 side. Specifically, an opening 921g is formed in the surrounding portion 921 so as to be surrounded by the tip portions 921a of the side wall portions 921b to 921e. The pressure release valve 300 enters the surrounding portion 921 from the opening 921g.

[0068] The surrounding portion 922 has a side wall portion 922b, a side wall portion 922c, a side wall portion 922d, and a side wall portion 922e. The side wall portions 922b to 922e are provided on the Y2 side, the X2 side, the Y1 side, and the X1 side of the respiratory membrane 400, respectively. That is, the respiratory membrane 400 is surrounded on all sides by the side wall portions 922b to 922e.

[0069] A slit 922f is provided in the side wall portion 922b. The slit 922f is provided in the side wall portion 922b so as to extend from the Z-direction position where the tip portion 922a is provided (i.e., the lower end portion of the side wall portion 921b) to the Z1 side. That is, the slit 922f is open on the lower side (Z2 side). The slit 922f may be provided in any one of the side wall portions 922c to 922e. The slit 922f may also be provided in two or more of the side wall portions 922b to 922e.

[0070] The surrounding portion 922 is open on the Z2 side. Specifically, an opening 922g is formed in the surrounding portion 922 so as to be surrounded by the tip portions 922a of the side wall portions 922b to 922e. The pressure release valve 300 enters the surrounding portion 922 from the opening 922g.

[0071] 4 again, the upper end 921h of the slit 921f is located on the Z1 side of the position where the top plate 113 is provided in the Z direction. The upper end 921h is located on the Z2 side of the position where the upper end 310 of the pressure release valve 300 is provided in the Z direction.

[0072] 5, the upper end 922h of the slit 922f is located on the Z1 side of the position where the top plate 113 is provided in the Z direction. The upper end 922h is located on the Z2 side of the position where the upper end 410 of the breathing membrane 400 is provided in the Z direction.

[0073] 4 and 5, first bus bar 230 is covered with heat insulating material 230a. Second bus bar 240 is covered with heat insulating material 240a. Heat insulating material 230a and heat insulating material 240a are each made of, for example, mica, which is a natural inorganic mineral solidified by heat pressing.

[0074] 2 and 4, sealing member 500 seals space S3 (see FIG. 4) between case 100 (upper cover 110) and underbody 920 (floor panel 920a). Specifically, sealing member 500 seals the space in the vicinity of recess 111 within space S3. Note that the vicinity of recess 111 includes not only the vicinity of recess 111 but also recess 111 itself. Note that sealing member 500 is formed of, for example, rubber. Space S3 is an example of a "gap" in the present disclosure.

[0075] 2, the seal member 500 is provided so as to surround the pressure release valve 300. The seal member 500 is formed in an annular shape. The seal member 500 is supported from the Z2 side by the top plate portion 113 of the upper cover 110.

[0076] The seal member 500 is formed with a vent 510. Smoke and the like released to the outside from the pressure release valve 300 passes through the vent 510. The vent 510 is an opening (slit) provided in a part of the annular seal member 500. The vent may also be a through-hole provided in the seal member 500.

[0077] 7, the pressure release valve 300 is disposed at position P1 in the X direction. The breathing membrane 400 is disposed at position P2 in the X direction. Position P2 is located closer to the X1 side than position P1. Positions P1 and P2 are examples of the "first position" and "second position" of the present disclosure, respectively.

[0078] The vent part 510 is disposed at position P3 between positions P1 and P2 in the X direction. Specifically, the vent part 510 is provided between the pressure release valve 300 and the breathing membrane 400. More specifically, the vent part 510 is provided on a straight line connecting the pressure release valve 300 and the breathing membrane 400. Position P3 is an example of the "third position" of the present disclosure.

[0079] 7, the recess 111 is provided at a position (position P1) separated from the recess 112. The recess 111 is a recess that is different (discontinuous) from the recess 112. The recess 111 (side surface portion 111b) is connected to the recess 112 (side surface portion 112b) by a portion 113c of the top plate portion 113. The portion 113c is provided between the first covering portion 113a and the second covering portion 113b (both see FIG. 2, etc.).

[0080] As described above, in this embodiment, the pressure release valve 300 and the breathing membrane 400 are provided in the recess 111 and the recess 112, respectively, which are recessed downward toward the space S1 between the first power storage stack 210 and the second power storage stack 220. This makes it possible to prevent sparks and smoke from the power storage cells (211, 221) from scattering by the side surface 111b of the recess 111 (the side surface 112b of the recess 112), etc. As a result, it is possible to prevent sparks from being released to the outside of the case 100, and also to reduce the thermal effect of smoke on the breathing membrane 400.

[0081] Furthermore, by providing the pressure release valve 300 and the breathing membrane 400 in the recess 111 and the recess 112, respectively, it is possible to lower the height positions (positions in the Z direction) of the upper end portion 310 of the pressure release valve 300 and the upper end portion 410 of the breathing membrane 400. This allows the electricity storage device 1 to be easily mounted on the vehicle 900.

[0082] In this embodiment, the pressure release valve 300 and the breathing membrane 400 are surrounded by the surrounding portion 921 and the surrounding portion 922, respectively. This makes it possible to easily keep smoke around the pressure release valve 300 and the breathing membrane 400. As a result, it is possible to prevent the oxygen ratio around the pressure release valve 300 and the breathing membrane 400 from becoming too high.

[0083] In the above embodiment, an example has been shown in which the recess 111 is a recess different from the recess 112, but the present disclosure is not limited to this. The pressure release valve 300 and the breathing membrane 400 may be provided in a common (continuously formed) recess. For example, as shown in Fig. 8, the pressure release valve 300 and the breathing membrane 400 are each provided in a recess 611 provided in the upper cover 610. In other words, the top plate portion 613 of the upper cover 610 is not disposed between the pressure release valve 300 and the breathing membrane 400, and only a portion of the space of the recess 611 is formed.

[0084] In the above embodiment, the pressure release valve 300 and the breathing membrane 400 are surrounded by the surrounding portion 921 and the surrounding portion 922, respectively, but the present disclosure is not limited to this. Only one of the surrounding portion 921 and the surrounding portion 922 may be provided on the underbody of the vehicle.

[0085] In the above embodiment, an example has been shown in which the seal member 500 and the surrounding portion 921 each surround the pressure release valve 300, but the present disclosure is not limited to this. Only one of the seal member 500 and the surrounding portion 921 may be provided so as to surround the pressure release valve 300. Also, a seal member may be provided so as to surround the breathing membrane 400.

[0086] In the above embodiment, an example has been described in which the power storage device 1 is disposed in the underbody 920 of the vehicle 900, but the present disclosure is not limited to this. The power storage device 1 may also be disposed at the bottom of an electrical device other than a vehicle (for example, a stationary power storage device).

[0087] In the above embodiment, the vent 510 is disposed at position P3 in the X direction between position P1 where the pressure release valve 300 is disposed and position P2 where the breathing membrane 400 is disposed, but the present disclosure is not limited to this. For example, the vent may be disposed on the opposite side of position P2 from position P1 in the X direction.

[0088] In the above embodiment, an example was shown in which the pressure release valve 300 and the breathing membrane 400 were provided separately, but the present disclosure is not limited to this. The pressure release valve may be provided integrally with the breathing membrane. Furthermore, the pressure release valve 300 and the breathing membrane 400 may be adjacent to each other.

[0089] In the above embodiment, an example has been described in which first bus bar 230 and second bus bar 240 are covered with thermal insulation material 230a and thermal insulation material 240a, respectively, but the present disclosure is not limited to this. At least one of thermal insulation material 230a and thermal insulation material 240a may not be provided.

[0090] The configurations of the above-described embodiment and the various modified examples may be combined with each other.

[0091] 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]

[0092] 1 Electricity storage device, 100 Case, 110, 610 Upper cover, 111 Recess (first recess), 112 Recess (second recess), 113, 613 Top plate portion, 120 Lower case, 200 Electricity storage module, 210 First electricity storage stack, 220 Second electricity storage stack, 230 First bus bar (bus bar), 230a, 240a Heat insulating material, 240 Second bus bar (bus bar), 300 Pressure release valve, 310 Upper end portion (upper end portion of pressure release valve), 400 Breathing membrane, 410 Upper end portion (upper end portion of breathing membrane), 500 Sealing member, 510 Ventilation portion, 611 Recess, 900 Vehicle, 910 Vehicle body, 920 Underbody, 921, 922 Enclosure portion, 921f, 922f Slit, 921h, 922h Upper end (upper end of slit), D distance, P1 position (first position), P2 position (second position), P3 position (third position), S1 space, S3 space (gap), X direction (predetermined direction), Y direction (direction intersecting with the up-down direction), Z direction (up-down direction).

Claims

1. a power storage module including a first power storage stack and a second power storage stack arranged at an interval in a direction intersecting the up-down direction; a case that houses the power storage module; a pressure release valve provided in the case; a breathing membrane; The case is a lower case that supports the electricity storage module from below; an upper cover provided to cover the power storage module from above, a recess formed in the upper cover that is recessed downward toward a space between the first power storage stack and the second power storage stack, The pressure release valve and the breathing membrane are each disposed in the recess.

2. the upper cover is formed with a first recess in which the pressure release valve is disposed and a second recess in which the breathing membrane is disposed, The power storage device according to claim 1 , wherein the first recess is provided at a position spaced apart from the second recess.

3. each of the first power storage stack and the second power storage stack includes a bus bar provided on the space side between the first power storage stack and the second power storage stack; The power storage device according to claim 1 or 2, wherein the bus bars are covered with a heat insulating material.

4. The car body and A vehicle comprising the power storage device according to claim 1.

5. the vehicle body includes an underbody in which the power storage device is disposed, The vehicle according to claim 4 , wherein the underbody has an enclosing portion at least a portion of which is recessed in the recess and which is provided to enclose at least one of the pressure release valve and the breathing membrane.

6. the upper cover includes a top plate portion, The recess is recessed downward from the top plate portion, A slit is formed in the surrounding portion, The vehicle according to claim 5 , wherein an upper end of the slit is located above the top panel portion.

7. 7. The vehicle according to claim 6, wherein an upper end of the pressure release valve and an upper end of the breathing membrane are each located above the top plate portion.

8. the vehicle body includes an underbody in which the power storage device is disposed, The vehicle further includes a seal member that seals a gap between the case and the underbody, the sealing member is disposed to surround the pressure release valve, The vehicle according to any one of claims 4 to 7, wherein the seal member is formed with a ventilation portion.

9. the breathing membrane is disposed at a second position on one side of the first position at which the pressure release valve is disposed in a predetermined direction, The vehicle according to claim 8 , wherein the ventilation portion is disposed at a third position between the first position and the second position in the predetermined direction.

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