Electricity storage device and vehicle

Abstract

The utility model relates to an electric power storage device and a vehicle. The electric power storage device comprises an electric power storage module, a shell, a pressure relief valve and a breathing film, wherein the electric power storage module comprises a first electric power storage stacking body and a second electric power storage stacking body which are arranged at intervals in the Y direction; the shell is used for containing the electric power storage module; the case includes an upper cover that covers the power storage module from above. The upper cover has formed therein a recess that is recessed downward toward a space between the first power storage stack and the second power storage stack. The pressure relief valve and the breathing film are each disposed in the recess.

Description

Technical Field

[0001] This disclosure relates to energy storage devices and vehicles. Background Technology

[0002] International Publication No. 2020-134054 discloses a power battery pack comprising a battery module consisting of multiple individual cells and a battery tray for accommodating (accommodating) the battery module. The battery tray is provided with an exhaust port for discharging gases (fumes) generated from the individual cells. Utility Model Content

[0003] Although not described in the aforementioned International Publication No. 2020-134054, there are cases where a pressure relief valve (vent) and a breathing membrane are disposed on the upper cover of the battery tray (casing). In this case, when sparks or smoke are generated in a single battery (energy storage stack), it is possible to release the sparks to the outside of the battery tray through the pressure relief valve, or to have the breathing membrane absorb the heat effects from the sparks or smoke from the battery stack.

[0004] This disclosure was made to solve the aforementioned problems, and its purpose is to provide an energy storage device and vehicle that can suppress adverse effects caused by sparks and smoke from the energy storage stack when a pressure relief valve and a breathing membrane are disposed in the housing.

[0005] The energy storage device of the first aspect of this disclosure includes an energy storage module comprising a first energy storage stack and a second energy storage stack arranged at intervals in a direction intersecting the vertical direction, a housing housing the energy storage module, a pressure relief valve disposed in the housing, and a breathing membrane. The housing includes a lower housing supporting the energy storage module from below and an upper cover disposed to cover the energy storage module from above. A recess is formed in the upper cover that is recessed downward toward the space between the first and second energy storage stacks. The pressure relief valve and the breathing membrane are each disposed in the recess.

[0006] In the energy storage device of the first aspect of this disclosure, as described above, a pressure relief valve and a breathing membrane are respectively disposed in the recessed portion that is recessed downward toward the space between the first energy storage stack and the second energy storage stack. This allows the side portion (the surface extending in the vertical direction) forming the recess to prevent at least a portion of the sparks and smoke generated from each of the first and second energy storage stacks from scattering. As a result, it is possible to suppress the direct scattering (blowing) of sparks and smoke from each of the first and second energy storage stacks toward the pressure relief valve and the breathing membrane. Thus, adverse effects caused by sparks and smoke from the energy storage stacks can be suppressed.

[0007] In addition, by placing the pressure relief valve and the breathing membrane in the recess, the height of the upper end of the pressure relief valve and the upper end of the breathing membrane can be reduced.

[0008] In the energy storage device of the first aspect described above, it is preferable that a first recess for arranging a pressure relief valve and a second recess for arranging a breathing membrane are formed in the upper cover. The first recess is located separately from the second recess. With this configuration, the breathing membrane can be positioned separately from the pressure relief valve. As a result, even if air enters the housing from outside through the pressure relief valve, the oxygen ratio around the breathing membrane can be suppressed from increasing. Thus, the thermal impact on the breathing membrane can be reduced.

[0009] In the energy storage device of the first aspect described above, it is preferable that the first energy storage stack and the second energy storage stack each include a busbar disposed on the space side between the first energy storage stack and the second energy storage stack. The busbar is covered by a heat insulation member. If configured in this way, even when smoke circulates in the aforementioned space, the thermal impact of smoke on the busbar can be suppressed.

[0010] The vehicle of the second aspect of this disclosure includes a vehicle body and the aforementioned energy storage device of the first aspect. Thus, a vehicle capable of suppressing adverse effects caused by sparks and smoke from the energy storage stack can be provided.

[0011] In the vehicle described in the second aspect above, it is preferable that the vehicle body includes a body bottom where an energy storage device is configured. The body bottom has a surrounding portion disposed such that at least a portion of it extends into a recess and surrounds at least one of the pressure relief valve and the breathing membrane. If configured in this way, the surrounding portion can be used to fill the area around at least one of the pressure relief valve and the breathing membrane with smoke. As a result, it is possible to prevent the oxygen ratio around at least one of the pressure relief valve and the breathing membrane from becoming too high.

[0012] In this case, it is preferable that the upper cover includes a top plate portion. The recess is provided such that it is recessed downward from the top plate portion. A slit is formed in the surrounding portion. The upper end of the slit is located above the top plate portion. If configured in this way, even if water flows into the recess, water can be drained from the recess to the top plate portion through the slit.

[0013] In the aforementioned vehicle with a roof section, it is preferable that the upper end of the pressure relief valve and the upper end of the breathing membrane are each located above the roof section. This configuration helps to prevent the pressure relief valve and the breathing membrane from being submerged in water.

[0014] In the vehicle described in the second aspect above, it is preferable that the vehicle body includes a body bottom where an electric storage device is installed. The vehicle has a sealing member that seals the gap between the housing and the body bottom. The sealing member is arranged to surround the pressure relief valve. A vent is formed in the sealing member. With this configuration, the area around the pressure relief valve can be filled with smoke through the sealing member. As a result, it is possible to suppress the oxygen ratio around the pressure relief valve from becoming too high. In addition, by forming a vent in the sealing member, it is possible to suppress the pressure around the pressure relief valve from becoming excessively high due to smoke.

[0015] In this case, it is preferable that the breathing membrane is positioned in a predetermined direction at a second position, one side further than the first position where the pressure relief valve is located. The ventilation section is positioned in the predetermined direction at a third position between the first and second positions. With this configuration, the smoke discharged from the pressure relief valve can flow towards the breathing membrane. As a result, it is possible to suppress the increase of the oxygen ratio around the breathing membrane.

[0016] The above and other objects, features, aspects and advantages of this invention will become apparent from the following detailed description of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0017] Figure 1 This is a diagram showing the configuration of a vehicle equipped with an energy storage device according to one embodiment.

[0018] Figure 2 This is a perspective view showing the configuration of an energy storage device according to one embodiment.

[0019] Figure 3 This is a perspective view showing the configuration of an energy storage device with the top cover of one embodiment removed.

[0020] Figure 4 It is along Figure 2 A cross-sectional view along line IV-IV.

[0021] Figure 5 It is along Figure 2 A cross-sectional view of the VV line.

[0022] Figure 6 This is a perspective view of the underbody enclosure of a vehicle body according to one embodiment, viewed from below.

[0023] Figure 7 It is along Figure 2 A sectional view along line VII-VII.

[0024] Figure 8 This is a perspective view showing the configuration near the recess of a modified embodiment of an energy storage device. Detailed Implementation

[0025] Embodiments of this disclosure will be described with reference to the accompanying drawings. Furthermore, in the drawings referred to below, the same or equivalent components are labeled with the same reference numerals.

[0026] Figure 1 This is a diagram showing a vehicle 900 equipped with the energy storage device 1 according to an embodiment of the present disclosure. The energy storage device 1 is a device for storing the driving power of the vehicle 900. The vehicle 900 includes, for example, a PHEV (Plug-in Hybrid Electric Vehicle), a BEV (Battery Electric Vehicle), or an FCEV (Fuel Cell Electric Vehicle).

[0027] The X, Y, and Z directions shown in this specification are mutually orthogonal. For example, the X and Y directions can be the front-rear and left-right directions of the vehicle 900, respectively. Additionally, the Z direction can be the up-down (vertical) direction. Furthermore, the X and Y directions are examples of the "predetermined direction" and "direction intersecting the up-down direction" of this disclosure, respectively. Additionally, the Z direction is an example of the "up-down direction" of this disclosure.

[0028] In addition to the energy storage device 1, the vehicle 900 also includes a body 910. The body 910 has a body bottom 920. The body bottom 920 is located at the lower part (bottom) of the body 910. The energy storage device 1 is disposed at the body bottom 920. Specifically, the energy storage device 1 is fixed (fastened) to the body bottom 920 below the body bottom 920.

[0029] like Figure 2 as well as Figure 3 As shown, the energy storage device 1 includes a housing 100 and an energy storage module 200 (see reference). Figure 3 ), pressure relief valve 300, breathing membrane 400, and sealing component 500.

[0030] like Figure 2 As shown, the housing 100 includes an upper cover 110 and a lower housing 120. The upper cover 110 is disposed on the Z1 side (above) of the lower housing 120. The upper cover 110 is arranged to cover (cover) the lower housing 120 from the Z1 side. By assembling the upper cover 110 to the lower housing 120, a receiving space is formed in the housing 100. Energy storage module 200 (see reference) Figure 3 It is configured in the aforementioned containment space.

[0031] That is, the upper cover 110 is configured to cover the energy storage module 200 from the Z1 side. Additionally, the lower housing 120 supports the energy storage module 200 from the Z2 side. The periphery of the upper cover 110 is fixed to the peripheral wall 122 of the lower housing 120 by bolts or the like (described later, see reference). Figure 3 The upper part of ).

[0032] Figure 3 This is a perspective view of the energy storage device 1 with the upper cover 110 removed from the lower housing 120.

[0033] like Figure 3 As shown, the energy storage module 200 includes a plurality of first energy storage stacks 210, a plurality of second energy storage stacks 220, a first busbar 230, a second busbar 240, a first junction box 250, and a second junction box 260. Furthermore, the first busbar 230 and the second busbar 240 are each examples of a "busbar" as disclosed herein.

[0034] Multiple first energy storage stacks 210 are arranged in an X-direction configuration. In this embodiment, the multiple first energy storage stacks 210 include six first energy storage stacks 210. However, the number of first energy storage stacks 210 is not limited to six. Each first energy storage stack 210 has a cuboid shape that is elongated in the Y-direction, which is orthogonal to both the X and Z directions.

[0035] Each first energy storage stack 210 includes a plurality of energy storage cells 211 (see reference). Figure 4 Multiple energy storage units 211 are arranged, for example, in the Y direction. Alternatively, multiple energy storage units 211 can be arranged in the X direction. Each energy storage unit 211 is formed in a flat cuboid shape. For example, a lithium-ion battery can be used as each energy storage unit 211. Each energy storage unit 211 can be constructed as an all-solid-state battery using a solid electrolyte. Each energy storage unit 211 has a safety valve 211a (see reference) located opposite the upper cover 110. Figure 4 ).

[0036] Each second energy storage stack 220 includes a plurality of energy storage cells 221 (see reference). Figure 4 Multiple energy storage units 221 are arranged, for example, in the Y direction. Alternatively, multiple energy storage units 221 can be arranged in the X direction. Each energy storage unit 221 is formed in a flat cuboid shape. For example, a lithium-ion battery can be used as each energy storage unit 221. Each energy storage unit 221 can be constructed as an all-solid-state battery using a solid electrolyte. Each energy storage unit 221 has a safety valve 221a (see reference) located opposite the upper cover 110. Figure 4 ).

[0037] like Figure 3As shown, a plurality of second energy storage stacks 220 face a plurality of first energy storage stacks 210 in the Y direction. The plurality of second energy storage stacks 220 comprises six second energy storage stacks 220. A pair of first energy storage stacks 210 and second energy storage stacks 220 arranged in the Y direction are arranged in a configuration of six in the X direction. The first energy storage stacks 210 and second energy storage stacks 220 are arranged at a predetermined interval D in the Y direction. That is, a space S1 (see reference) is provided between the first energy storage stacks 210 and the second energy storage stacks 220. Figure 4 Furthermore, the number of second energy storage stacks 220 is not limited to six. The configuration of each second energy storage stack 220 is the same as that of the first energy storage stack 210.

[0038] The first busbar 230 connects the first energy storage stacks 210 that are adjacent to each other in the X direction. The first busbar 230 is disposed in space S1 (refer to...). Figure 4 Specifically, the arrangement space S2 (refer to) between the plurality of first energy storage stacks 210 and the plurality of second energy storage stacks 220. Figure 4 Furthermore, the configuration space S2 is a part of space S1.

[0039] The second busbar 240 connects the second energy storage stacks 220 that are adjacent to each other in the X direction. The second busbar 240 is disposed in space S1 (refer to...). Figure 4 On the side. Specifically, the second busbar 240 is installed in the installation space S2 (refer to...). Figure 4 ).

[0040] Furthermore, the first energy storage stack 210 on the X2 side of the plurality of first energy storage stacks 210 and the second energy storage stack 220 on the X2 side of the plurality of second energy storage stacks 220 are connected by a busbar (not shown). Thus, the plurality of first energy storage stacks 210 and the plurality of second energy storage stacks 220 are electrically connected in series.

[0041] The first junction box 250 is positioned in the X direction opposite (specifically, on the X1 side) of the plurality of first energy storage stacks 210. The first junction box 250 houses relays, fuses, etc. The first junction box 250 has a first connector 251. The first connector 251 protrudes outward in the X direction.

[0042] The second junction box 260 is positioned in the X direction opposite (specifically, on the X1 side) of the plurality of second energy storage stacks 220. The second junction box 260 is positioned in the Y direction at a distance from the first junction box 250. The second junction box 260 houses relays, fuses, etc. The second junction box 260 has a second connector 261. The second connector 261 protrudes outward in the X direction.

[0043] The lower housing 120 opens upward. The lower housing 120 has a bottom wall 121, a peripheral wall 122, and a partition 123.

[0044] The bottom wall 121 is disposed on the Z2 side of the energy storage module 200. The bottom wall 121 supports the energy storage module 200 from the Z2 side.

[0045] The peripheral wall 122 rises from the periphery of the bottom wall 121. The peripheral wall 122 surrounds the periphery of the plurality of first energy storage stacks 210 and the plurality of second energy storage stacks 220. The peripheral wall 122 is formed in a generally rectangular cylindrical shape.

[0046] The separator 123 separates the plurality of first energy storage stacks 210 from the plurality of second energy storage stacks 220. The separator 123 has a shape that extends along the X direction. The height of the separator 123 is lower than the height of the peripheral wall 122.

[0047] Pressure relief valve 300 (reference) Figure 2 It is installed in the housing 100. The pressure relief valve 300 releases the pressure inside the housing 100. The pressure relief valve 300 opens when the pressure inside the housing 100 reaches or exceeds a reference value. The pressure relief valve 300 is composed of a check valve.

[0048] Breathing membrane 400 (reference) Figure 2 It is disposed in the housing 100. The breathing membrane 400 adjusts the pressure inside the housing 100 by allowing the passage of gas between the inside and outside of the housing 100.

[0049] like Figure 2 As shown, the pressure relief valve 300 and the breathing membrane 400 are each installed on the upper cover 110.

[0050] Here, the energy storage stack may sometimes emit sparks or smoke when the temperature rises excessively. Specifically, the sparks or smoke are released from the safety valve of the energy storage unit. In this case, it is advisable to release the sparks to the outside of the housing through the pressure relief valve, or to have the heat effect from the sparks or smoke from the energy storage stack be absorbed by the breathing membrane.

[0051] Therefore, in this embodiment, as Figure 4As shown, a recess 111 is formed in the upper cover 110, which is recessed downward toward the space S1 between the first energy storage stack 210 and the second energy storage stack 220. A pressure relief valve 300 is provided in the recess 111. Furthermore, the recess 111 is an example of the "first recess" of this disclosure.

[0052] In addition, such as Figure 5 As shown, a recess 112 is formed in the upper cover 110, which is recessed downward toward the space S1 between the first energy storage stack 210 and the second energy storage stack 220. A breathing membrane 400 is disposed in the recess 112. Furthermore, the recess 112 is an example of the "second recess" of this disclosure.

[0053] First, refer to Figure 4 The recess 111 will be described in detail. The upper cover 110 is provided with a bottom part 111a forming the recess 111 and a plurality of side parts 111b.

[0054] A pressure relief valve 300 is disposed on the bottom portion 111a. A through hole 111c for discharging smoke and other contaminants generated in the energy storage units (211, 221) is provided on the bottom portion 111a. The pressure relief valve 300 is disposed on the bottom portion 111a such that it blocks the through hole 111c from the Z1 side. The bottom portion 111a extends orthogonally to the Z direction. The bottom portion 111a is located below (on the Z2 side) both the upper end portion 210a of the first energy storage stack 210 and the upper end portion 220a of the second energy storage stack 220 in the Z direction.

[0055] Multiple (four in this embodiment) side portions 111b are each provided in such a way that they extend (stand upright) from the outer periphery of the bottom portion 111a toward the Z1 side. The pressure relief valve 300 is surrounded by the four side portions 111b. The recess 111 is a cuboid space formed by the bottom portion 111a and the four side portions 111b. Furthermore, the shape of the recess 111 is not limited to the example described above. For example, the recess 111 may also be a cylindrical space.

[0056] The upper cover 110 includes a top plate portion 113. The top plate portion 113 is a flat, plate-like member forming the upper end surface of the upper cover 110. The recess 111 is provided in a manner that recesses downward (towards the Z2 side) from the top plate portion 113. Specifically, the top plate portion 113 has a first cover portion 113a covering a plurality of first energy storage stacks 210 and a second cover portion 113b covering a plurality of second energy storage stacks 220. The first cover portion 113a and the second cover portion 113b are each formed as a flat plate. The recess 111 is provided between the first cover portion 113a and the second cover portion 113b. The recess 111 is recessed downward from each of the first cover portion 113a and the second cover portion 113b. That is, the recess 111 is recessed downward from each of the first cover portion 113a and the second cover portion 113b toward the space S1.

[0057] Each of the multiple side portions 111b is provided such that it extends downward from the top plate portion 113 toward the bottom portion 111a. The side portion 111b on the Y1 side extends downward from the first covered portion 113a toward the bottom portion 111a. The side portion 111b on the Y2 side extends downward from the second covered portion 113b toward the bottom portion 111a.

[0058] The top plate portions 113 (113a, 113b) are positioned above (on the Z1 side) of both the position where the upper end portion 210a of the first energy storage stack 210 and the position where the upper end portion 220a of the second energy storage stack 220 are located in the Z direction. Furthermore, the positions where the first cover portion 113a and the second cover portion 113b are located are the same in the Z direction. The first cover portion 113a is positioned opposite the upper end portion 210a in the Z direction. The second cover portion 113b is positioned opposite the upper end portion 220a in the Z direction.

[0059] By providing the recess 111 on the upper cover 110 as described above, sparks from the energy storage stack (210, 220) can be dispersed to the side portion 111b and the top plate portion 113. As a result, it is possible to suppress the dispersion of sparks to the pressure relief valve 300.

[0060] The pressure relief valve 300 has an upper end portion 310. The upper end portion 310 is disposed in the Z direction at a position closer to the Z1 side than the position where the top plate portion 113 is provided. That is, the pressure relief valve 300 protrudes from the recess 111 toward the Z1 side.

[0061] A surround portion 921 is provided at the bottom 920 of the vehicle body 900. The surround portion 921 is provided such that it protrudes from the floor panel 920a of the bottom 920 of the vehicle body towards the Z2 side. The top end portion 921a of the surround portion 921 on the Z2 side enters into the recess 111. Furthermore, the surround portion 921 does not contact the side portion 111b or the bottom portion 111a of the recess 111. In addition, the top end portion 921a is provided on the side wall portions 921b to 921e, which will be described later.

[0062] Next, refer to Figure 5 The recess 112 will be described in detail below. The upper cover 110 is provided with a bottom part 112a forming the recess 112 and a plurality of side parts 112b.

[0063] A breathing membrane 400 is disposed (placed) on the bottom surface 112a. A through-hole 112c is provided on the bottom surface 112a for discharging smoke and other contaminants generated in the energy storage units (211, 221). The breathing membrane 400 is disposed on the bottom surface 112a such that the through-hole 112c is blocked from the Z1 side. The bottom surface 112a extends orthogonally to the Z direction. The bottom surface 112a is located in the Z direction at a position below (Z2 side) both the position where the upper end 210a of the first energy storage stack 210 is disposed and the position where the upper end 220a of the second energy storage stack 220 is disposed.

[0064] Multiple (four in this embodiment) side portions 112b are each provided in such a way that they extend (stand upright) 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 cuboid space formed by the bottom portion 112a and the four side portions 112b. Furthermore, the shape of the recess 112 is not limited to the example described above. For example, the recess 112 may also be a cylindrical space.

[0065] The recess 112 is provided such that it is recessed downward from the top plate portion 113 (Z2 side). 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. That is, the recess 112 is recessed downward from each of the first covering portion 113a and the second covering portion 113b toward the space S1.

[0066] Each of the multiple side portions 112b is provided such that it extends downward from the top plate portion 113 toward the bottom portion 112a. The side portion 112b on the Y1 side extends downward from the first covered portion 113a toward the bottom portion 112a. The side portion 112b on the Y2 side extends downward from the second covered portion 113b toward the bottom portion 112a.

[0067] By providing the recess 112 on the upper cover 110 as described above, sparks from the energy storage stack (210, 220) can be dispersed towards the side portion 112b and the top plate portion 113. As a result, spark dispersion towards the breathing membrane 400 can be suppressed. In addition, smoke from the energy storage stack (210, 220) can flow along the side portion 112b and the top plate portion 113 and move to the bottom portion 112a (breathing membrane 400) (see reference). Figure 5 (The single-dot dashed line). Therefore, it is possible to suppress the direct dispersion (blowing) of smoke from the energy storage stack (210, 220) to the bottom surface 112a (breathing membrane 400). As a result, it is possible to suppress the thermal effects caused by smoke in the breathing membrane 400.

[0068] The breathing membrane 400 has an upper end portion 410. The upper end portion 410 is positioned in the Z direction at a position closer to the Z1 side than the position where the top plate portion 113 is provided. That is, the breathing membrane 400 protrudes from the recess 112 toward the Z1 side.

[0069] A surround portion 922 is provided at the bottom 920 of the vehicle body 900. The surround portion 922 is provided such that it protrudes from the floor panel 920a of the bottom 920 of the vehicle body towards the Z2 side. The top end portion 922a of the surround portion 922 on the Z2 side enters into the recess 112. Furthermore, the surround portion 922 does not contact the side portion 112b or the bottom portion 112a of the recess 112. In addition, the top end portion 922a is provided on the side wall portions 922b to 922e, which will be described later.

[0070] like Figure 6 As shown, the surrounding portion 921 and the surrounding portion 922 are arranged in the X direction.

[0071] The surrounding portion 921 has sidewall portions 921b, 921c, 921d, and 921e. Sidewall portions 921b to 921e are respectively provided on the Y2 side, X2 side, Y1 side, and X1 side of the pressure relief valve 300. That is, the pressure relief valve 300 is surrounded from all sides by sidewall portions 921b to 921e.

[0072] A slit 921f is provided in the side wall portion 921b. The slit 921f extends in the side wall portion 921b from a position in the Z direction where the top end portion 921a is provided (i.e., the lower end of the side wall portion 921b) toward the Z1 side. That is, the lower side (Z2 side) of the slit 921f is open. Furthermore, the slit 921f can be provided in any one of the side wall portions 921c to 921e. In addition, the slit 921f can be provided in two or more of the side wall portions 921b to 921e.

[0073] Furthermore, the Z2 side of the enclosure 921 is open. Specifically, an opening 921g is formed in the enclosure 921 such that it is surrounded by the top end portion 921a of each of the side wall portions 921b to 921e. The pressure relief valve 300 enters the enclosure 921 through the opening 921g.

[0074] The surrounding portion 922 has sidewall portions 922b, 922c, 922d, and 922e. Sidewall portions 922b to 922e are respectively disposed on the Y2 side, X2 side, Y1 side, and X1 side of the breathing membrane 400. That is, the breathing membrane 400 is surrounded from all four sides by sidewall portions 922b to 922e.

[0075] A slit 922f is provided in the side wall portion 922b. The slit 922f extends in the side wall portion 922b from a position in the Z direction where the top end portion 922a is located (i.e., the lower end of the side wall portion 921b) toward the Z1 side. That is, the lower side (Z2 side) of the slit 922f is open. Furthermore, the slit 922f can be provided in any one of the side wall portions 922c to 922e. Alternatively, the slit 922f can be provided in two or more of the side wall portions 922b to 922e.

[0076] Furthermore, the Z2 side of the enclosure 922 is open. Specifically, an opening 922g is formed in the enclosure 922 such that it is surrounded by the top end portion 922a of each of the side wall portions 922b to 922e. The pressure relief valve 300 enters the enclosure 922 through the opening 922g.

[0077] Refer again Figure 4 The upper end portion 921h of the gap 921f is positioned in the Z direction at a position Z1 closer to the top plate portion 113. Furthermore, the upper end portion 921h is positioned in the Z direction at a position Z2 closer to the upper end portion 310 of the pressure relief valve 300.

[0078] Refer again Figure 5 The upper end portion 922h of the slit 922f is positioned in the Z direction at a position Z1 closer to the top plate portion 113. Furthermore, the upper end portion 922h is positioned in the Z direction at a position Z2 closer to the upper end portion 410 of the breathing membrane 400.

[0079] like Figure 4 as well as Figure 5 As shown, the first busbar 230 is covered by insulation 230a. The second busbar 240 is covered by insulation 240a. Insulation 230a and insulation 240a are each made of, for example, mica obtained by hot pressing and solidifying natural inorganic minerals.

[0080] Refer again Figure 2 as well as Figure 4The sealing member 500 seals the space S3 (refer to) between the housing 100 (upper cover 110) and the bottom of the vehicle body 920 (floor panel 920a). Figure 4 The space S3 is sealed. Specifically, the sealing member 500 seals the space near the recess 111 in the space S3. Furthermore, the area near the recess 111 includes not only the vicinity of the recess 111 but also the recess 111 itself. Additionally, the sealing member 500 is formed, for example, of rubber. Furthermore, the space S3 is an example of a "gap" in this disclosure.

[0081] like Figure 2 As shown, the sealing member 500 is provided to surround the pressure relief valve 300. The sealing member 500 is formed in annular shape. Furthermore, the sealing member 500 is supported from the Z2 side by the top plate portion 113 of the upper cover 110.

[0082] A vent 510 is formed in the sealing member 500. Smoke and other fumes released from the pressure relief valve 300 to the outside pass through the vent 510. The vent 510 is an opening (slit) provided in a part of the annular sealing member 500. Alternatively, the vent may be a through hole provided in the sealing member 500.

[0083] like Figure 7 As shown, the pressure relief 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 on the X1 side closer to position P1 than position P1. Furthermore, positions P1 and P2 are examples of the "first position" and "second position" of this disclosure, respectively.

[0084] The ventilation section 510 is disposed at position P3 in the X direction, between position P1 and position P2. Specifically, the ventilation section 510 is disposed between the pressure relief valve 300 and the breathing membrane 400. More specifically, the ventilation section 510 is disposed on the straight line connecting the pressure relief valve 300 and the breathing membrane 400. Furthermore, position P3 is an example of the "third position" of this disclosure.

[0085] In addition, such as Figure 7 As shown, recess 111 is located at a position separate from recess 112 (position P1). Recess 111 is a (discontinuous) recess different from recess 112. Recess 111 (side portion 111b) is connected to recess 112 (side portion 112b) via portion 113c in top plate portion 113. Furthermore, portion 113c is provided in the first covering portion 113a and the second covering portion 113b (both refer to...). Figure 2 Between (etc.).

[0086] As described above, in this embodiment, the pressure relief valve 300 and the breathing membrane 400 are respectively provided in recesses 111 and 112 that are recessed downward toward the space S1 between the first energy storage stack 210 and the second energy storage stack 220. Therefore, the side portion 111b of recess 111 (side portion 112b of recess 112) can be used to prevent the dispersion of sparks and smoke from the energy storage units (211, 221). As a result, the emission of sparks to the outside of the housing 100 can be suppressed, and the thermal impact of smoke on the breathing membrane 400 can be reduced.

[0087] Furthermore, by providing the pressure relief valve 300 and the breathing membrane 400 in the recesses 111 and 112 respectively, the height positions (Z-direction positions) of the upper end portion 310 of the pressure relief valve 300 and the upper end portion 410 of the breathing membrane 400 can be reduced. As a result, the energy storage device 1 can be easily mounted on the vehicle 900.

[0088] Furthermore, in this embodiment, the pressure relief valve 300 and the breathing membrane 400 are surrounded by surrounding portions 921 and 922, respectively. This allows smoke to easily accumulate around the pressure relief valve 300 and the breathing membrane 400. Consequently, it is possible to prevent the oxygen ratio around the pressure relief valve 300 and the breathing membrane 400 from becoming too high.

[0089] In the above embodiments, an example is shown where recess 111 is a different recess from recess 112, but this disclosure is not limited thereto. The pressure relief valve 300 and the breathing membrane 400 may also be configured as a common (continuously formed) recess. For example, as... Figure 8 As shown, the pressure relief valve 300 and the breathing membrane 400 are each disposed in the recess 611 provided in the upper cover 610. That is, the top plate portion 613 of the upper cover 610 is not disposed between the pressure relief valve 300 and the breathing membrane 400, but only a portion of the space where the recess 611 is formed.

[0090] In the above embodiments, an example is shown where the pressure relief valve 300 and the breathing membrane 400 are respectively surrounded by surrounding portions 921 and 922, but this disclosure is not limited thereto. Alternatively, only either surrounding portion 921 or surrounding portion 922 may be provided at the bottom of the vehicle body.

[0091] In the above embodiment, an example is shown where the sealing member 500 and the surrounding portion 921 each surround the pressure relief valve 300, but this disclosure is not limited thereto. It is also possible that only either the sealing member 500 or the surrounding portion 921 surrounds the pressure relief valve 300. Alternatively, a sealing member configured to surround the breathable membrane 400 may also be provided.

[0092] In the above embodiment, an example is shown where the energy storage device 1 is disposed at the bottom 920 of the vehicle body 900, but the present disclosure is not limited thereto. The energy storage device 1 may also be disposed at the bottom of electrical equipment other than the vehicle (e.g., a stationary energy storage device).

[0093] In the above embodiment, an example is shown where the ventilation unit 510 is positioned in the X direction at position P3 between position P1 where the pressure relief valve 300 is positioned and position P2 where the breathing membrane 400 is positioned, but this disclosure is not limited thereto. For example, the ventilation unit may also be positioned in the X direction on the opposite side from position P1 and position P2.

[0094] In the above embodiments, an example is shown where the pressure relief valve 300 and the breathing membrane 400 are provided independently, but this disclosure is not limited thereto. The pressure relief valve may also be provided integrally with the breathing membrane. In addition, the pressure relief valve 300 and the breathing membrane 400 may be adjacent to each other.

[0095] In the above embodiments, an example is shown where the first busbar 230 and the second busbar 240 are respectively covered by heat insulation member 230a and heat insulation member 240a, but this disclosure is not limited thereto. It is also possible that at least one of the heat insulation member 230a and heat insulation member 240a is not provided.

[0096] Furthermore, the above-described embodiments and various modifications can be combined with each other.

[0097] Embodiments of this utility model have been described, but it should be considered that the embodiments disclosed herein are illustrative and not restrictive in all respects. The scope of this utility model is set forth in the claims and is intended to include all modifications within the scope and equivalent meaning of the claims.

Claims

1. An energy storage device, comprising: An energy storage module includes a first energy storage stack and a second energy storage stack arranged at intervals in a direction intersecting the vertical direction; A housing that accommodates the energy storage module; A pressure relief valve is disposed in the housing; and respiratory membrane The housing comprises: The lower housing supports the energy storage module from below; and The cover is configured to cover the energy storage module from above. The upper cover has a recessed portion that is recessed downward toward the space between the first energy storage stack and the second energy storage stack. The pressure relief valve and the breathing membrane are each disposed in the recess.

2. The energy storage device according to claim 1, The upper cover has a first recess for arranging the pressure relief valve and a second recess for arranging the breathing membrane. The first recess is located at a position separate from the second recess.

3. The energy storage device according to claim 1 or 2, The first energy storage stack and the second energy storage stack each include a busbar disposed on the space side between the first energy storage stack and the second energy storage stack. The busbar is covered by thermal insulation.

4. A vehicle, comprising: Body; and The energy storage device according to claim 1.

5. The vehicle according to claim 4, The vehicle body includes a body bottom on which the energy storage device is configured. The bottom of the vehicle body has a surround portion arranged such that at least a portion enters the recess and surrounds at least one of the pressure relief valve and the breathing membrane.

6. The vehicle according to claim 5, The upper cover includes a top plate portion. The recess is provided such that it is recessed downward from the top plate portion. A gap is formed in the surrounding portion. The upper end of the gap is located above the top plate.

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

8. The vehicle according to any one of claims 4 to 7, The vehicle body includes a body bottom on which the energy storage device is configured. The vehicle also includes a sealing member that seals the gap between the housing and the bottom of the vehicle body. The sealing member is configured to surround the pressure relief valve. A vent is formed in the sealing member.

9. The vehicle according to claim 8, The breathing membrane is positioned in a predetermined direction at a second position, one side further away from the first position where the pressure relief valve is positioned. The ventilation section is positioned at a third position between the first position and the second position in the predetermined direction.

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