Power storage device, and vehicle

Abstract

To provide a power storage device preventing condensation water from continuing to accumulate inside a power storage device.SOLUTION: The power storage device includes: a first power storage stack 110; a second power storage stack 120 spaced apart from the first power storage stack 110; a housing case including an upper cover 520 and a lower case and housing the first power storage stack 110 and the second power storage stack 120; and a respiratory membrane 700 placed in the containment case. The power storage device has a space S1 that is formed extending in a first direction. The space S1 passes through at least the inter-stack region R1 located between the first power storage stack 110 and the second power storage stack 120. The respiratory membrane 700 is provided on the upper cover 520 above the space S1.SELECTED DRAWING: Figure 6

Description

[Technical Field]

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

[0002] For example, International Publication No. 2020 / 134054 (Patent Document 1) discloses an electricity storage device (battery pack) in which multiple electricity storage cells are arranged on both sides of a space extending in one direction. [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] Generally, a power storage device is provided with a cooler for cooling the power storage cells. When high-temperature power storage cells are cooled, condensation water is generated. If condensation water continues to accumulate inside the power storage device, problems such as short-circuiting between adjacent power storage cells occur. Therefore, there is a need to prevent condensation water from continuing to accumulate inside the power storage device.

[0005] An object of the present disclosure is to prevent condensation water from continuing to accumulate inside a power storage device. [Means for solving the problem]

[0006] An electric storage device according to one aspect of the present disclosure includes a first electric storage stack, a second electric storage stack arranged at a distance from the first electric storage stack, an accommodating case including an upper cover and a lower case and accommodating the first electric storage stack and the second electric storage stack, and a breathing membrane provided on the accommodating case. A space extending in a first direction is formed in the electric storage device. The space passes through at least an inter-stack region located between the first electric storage stack and the second electric storage stack. The breathing membrane is provided on the upper cover above the space.

[0007] Preferably, the breathing membrane is provided above the inter-stack region.

[0008] Preferably, a first connection member electrically connected to the first power storage stack is connected to the first power storage stack, and a second connection member electrically connected to the second power storage stack is connected to the second power storage stack, and the first connection member and the second connection member are arranged in the inter-stack region.

[0009] Preferably, when the arrangement direction of the first power storage stack and the second power storage stack is defined as a second direction, the power storage device further includes a first junction box arranged adjacent to the first power storage stack in the first direction, and a second junction box arranged adjacent to the second power storage stack in the first direction and adjacent to the first junction box in the second direction. The first junction box is electrically connected to the first power storage stack. The second junction box is electrically connected to the second power storage stack. The space passes through an inter-box region located between the first junction box and the second junction box. The breathing membrane is provided above the inter-box region.

[0010] A vehicle according to another aspect of the present disclosure includes the above-described power storage device. The breathing membrane is disposed below a center tunnel of the vehicle.

[0011] Preferably, a cover is provided on at least one end of the center tunnel. [Effects of the Invention]

[0012] According to the present disclosure, it is possible to prevent condensation water from continuously accumulating inside the power storage device. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a side view schematically illustrating a vehicle including an electricity storage device according to an embodiment of the present disclosure. [Figure 2] FIG. 1 is a perspective view schematically illustrating a power storage device 1. [Figure 3] 2 is a perspective view schematically showing a state in which an upper cover is removed from the electricity storage device 1. FIG. [Figure 4] 2 is a plan view schematically showing a state in which an upper cover is removed from the electricity storage device 1. FIG. [Figure 5] FIG. 5 is a cross-sectional view taken along line VV in FIG. [Figure 6] FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. [Figure 7] FIG. 2 is a perspective view schematically showing a floor panel 4 and an electricity storage device 1. [Figure 8] FIG. 10 is a perspective view schematically showing an electricity storage device according to a modified example. [Figure 9] FIG. 10 is a plan view schematically showing a state in which an upper cover is removed from an electricity storage device according to a modified example. [Figure 10] FIG. 10 is a cross-sectional view taken along line XX in FIG. [Figure 11] FIG. 10 is a cross-sectional view taken along line XI-XI in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, embodiments and modifications according to the present disclosure will be described with reference to the drawings. In the following description, the same parts and components are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed descriptions thereof will not be repeated. Note that the embodiments and modifications described below may be selectively combined as appropriate.

[0015] [Embodiment] An electricity storage device according to an embodiment of the present disclosure will be described with reference to Figures 1 to 7. Figure 1 is a side view that schematically shows a vehicle equipped with an electricity storage device according to an embodiment of the present disclosure.

[0016] 1, a vehicle 10 includes a power storage device 1 and a vehicle frame 3. The power storage device 1 is disposed below a floor panel 4 of the vehicle 10. Examples of the vehicle 10 include a hybrid vehicle, a plug-in hybrid vehicle, a fuel cell vehicle, and an electric vehicle.

[0017] Fig. 2 is a perspective view that schematically shows the energy storage device 1. Fig. 3 is a perspective view that schematically shows a state in which an upper cover has been removed from the energy storage device 1. Fig. 4 is a plan view that schematically shows a state in which an upper cover has been removed from the energy storage device 1. Fig. 5 is a cross-sectional view taken along line VV in Fig. 4. Fig. 6 is a cross-sectional view taken along line VI-VI in Fig. 4. Fig. 7 is a perspective view that schematically shows a floor panel 4 and the energy storage device 1.

[0018] 2 and 3, the energy storage device 1 includes a plurality of first energy storage stacks 110, a plurality of second energy storage stacks 120, a first bus bar 210, a second bus bar 220, a first junction box 310, a second junction box 320, a first wiring 230, a second wiring 240, a case 500, a breathing membrane 700, and coolers 801, 802 (see FIG. 6).

[0019] Referring to Fig. 3, the energy storage device 1 has a space S1 formed therein that extends in a first direction. The space S1 is a passageway for air inside the case 500 (see Fig. 2). The first direction corresponds to the front-to-rear direction of the vehicle 10 (see Fig. 1). The space S1 passes through an inter-stack region R1 located between the first energy storage stack 110 and the second energy storage stack 120. The space S1 also passes through an inter-box region R2 located between the first junction box 310 and the second junction box 320.

[0020] The multiple first power storage stacks 110 are arranged to line up in the first direction. In the present embodiment, the multiple first power storage stacks 110 include six first power storage stacks 110. However, the number of first power storage stacks 110 is not limited to six. The number of first power storage stacks 110 may be one or more. Each first power storage stack 110 is formed in a rectangular parallelepiped shape that is long in the second direction. The second direction corresponds to the width direction of the vehicle 10 (see FIG. 1). The second direction corresponds to the arrangement direction of the first power storage stacks 110 and the second power storage stacks 120. The third direction corresponds to the height direction of the power storage device 1 (see FIG. 2). The first direction is perpendicular to both the second direction and the third direction. The second direction is perpendicular to both the first direction and the third direction. The third direction is perpendicular to both the first direction and the second direction.

[0021] Referring to FIG. 5, each first power storage stack 110 includes a plurality of power storage cells 111. The plurality of power storage cells 111 are arranged, for example, to be aligned in a first direction. Note that the plurality of power storage cells 111 may also be arranged to be aligned in a second direction. Each power storage cell 111 is formed in a flat rectangular parallelepiped shape. An example of each power storage cell 111 is a lithium ion battery. Each power storage cell 111 may be formed as an all-solid-state battery using a solid electrolyte. As shown in FIG. 5, each power storage cell 111 includes a cell smoke exhaust valve 111a provided on an upper surface of a housing of the power storage cell 111.

[0022] 6, cooler 801 is provided along the lower surface of first power storage stack 110. Cooler 801 cools power storage cells 111 (see FIG. 5).

[0023] 3, the second power storage stack 120 is disposed at an interval in the second direction relative to the first power storage stack 110. More specifically, the second power storage stacks 120 are disposed so as to face the first power storage stacks 110 in the second direction and to be aligned in the first direction. In this embodiment, the second power storage stacks 120 include six second power storage stacks 120. However, the number of second power storage stacks 120 is not limited to six. The number of second power storage stacks 120 may be one or more. The configuration of each second power storage stack 120 is the same as the configuration of the first power storage stack 110.

[0024] 6, the cooler 802 is provided along the lower surface of the second power storage stack 120. The cooler 802 cools the power storage cells included in the second power storage stack 120.

[0025] Referring to FIG. 3 , the first bus bar 210 electrically connects a pair of first power storage stacks 110 adjacent to each other in the first direction. The first bus bar 210 is an example of a “first connecting member” in the present disclosure. That is, the first power storage stack 110 is connected to the first bus bar 210, which is electrically connected to the first power storage stack 110. The second bus bar 220 electrically connects a pair of second power storage stacks 120 adjacent to each other in the first direction. The second bus bar 220 is an example of a “second connecting member” in the present disclosure. That is, the second power storage stack 120 is connected to the second bus bar 220, which is electrically connected to the second power storage stack 120. The first bus bar 210 and the second bus bar 220 are arranged in an inter-stack region R1.

[0026] The first junction box 310 is disposed at a position facing the first power storage stack 110 in the first direction. More specifically, the first junction box 310 is disposed at a position adjacent in the first direction to the first power storage stack 110 that is disposed outermost in the first direction among the multiple first power storage stacks 110.

[0027] The first junction box 310 houses a relay, a fuse, and the like. The first wiring 230 electrically connects the first junction box 310 to the first power storage stack 110 that is arranged outermost in the first direction among the multiple first power storage stacks 110. That is, the first junction box 310 is electrically connected to the first power storage stack 110 that is arranged outermost in the first direction among the multiple first power storage stacks 110. The first junction box 310 has a first connector 312. The first connector 312 protrudes outward in the first direction.

[0028] The second junction box 320 faces the second power storage stack 120 in the first direction. The second junction box 320 is also arranged in a position facing the first junction box 310 at an interval in the second direction. More specifically, the second junction box 320 is arranged in a position adjacent in the first direction to the second power storage stack 120 that is arranged outermost in the first direction among the multiple second power storage stacks 120. The second junction box 320 is also arranged in a position adjacent to the first junction box 310 in the second direction.

[0029] The second junction box 320 houses a relay, a fuse, etc. The second wiring 240 electrically connects the second junction box 320 to the second power storage stack 120 that is arranged outermost in the first direction among the multiple second power storage stacks 120. In other words, the second junction box 320 is electrically connected to the second power storage stack 120 that is arranged outermost in the first direction among the multiple second power storage stacks 120. The second junction box 320 has a second connector 322. The second connector 322 protrudes outward in the first direction.

[0030] A part of the first wiring 230 and a part of the second wiring 240 are arranged in the inter-box region R2.

[0031] 2 and 3, case 500 is an example of the "container case" in the present disclosure. Case 500 accommodates a plurality of first power storage stacks 110, a plurality of second power storage stacks 120, a first bus bar 210, a second bus bar 220, a first junction box 310, a second junction box 320, a first wiring 230, a second wiring 240, and coolers 801 and 802 (see FIG. 6). Case 500 has a lower case 510 and an upper cover 520.

[0032] 3, the lower case 510 is open upward and has a bottom wall 512, a peripheral wall 514, and a partition 516.

[0033] The bottom wall 512 supports the plurality of first power storage stacks 110 and the plurality of second power storage stacks 120. The peripheral wall 514 stands upright from the peripheral edge of the bottom wall 512. The peripheral wall 514 surrounds the plurality of first power storage stacks 110 and the plurality of second power storage stacks 120. The peripheral wall 514 is formed in a substantially rectangular cylindrical shape.

[0034] The peripheral wall 514 includes a side wall 514a that faces the first power storage stack 110 and the second power storage stack 120 in the first direction. The side wall 514a extends in the second direction. The side wall 514a is inclined so as to gradually move away from the first power storage stack 110 and the second power storage stack 120 as it extends upward. However, the side wall 514a may be perpendicular to the bottom wall 512.

[0035] The partition portion 516 separates the plurality of first power storage stacks 110 and the plurality of second power storage stacks 120. The partition portion 516 has a shape that extends along the first direction. The height of the partition portion 516 is lower than the height of the peripheral wall 514. As shown in FIG. 3 , the first bus bar 210, the second bus bar 220, the first wiring 230, and the second wiring 240 are arranged on the partition portion 516.

[0036] 2 and 3, upper cover 520 accommodates, together with lower case 510, a plurality of first power storage stacks 110, a plurality of second power storage stacks 120, first bus bar 210, second bus bar 220, first junction box 310, second junction box 320, first wiring 230, second wiring 240, and coolers 801, 802 (see FIG. 6). A peripheral edge portion of upper cover 520 is fixed to an upper end portion of peripheral wall 514 with bolts or the like.

[0037] Upper cover 520 has an upper wall 522. Upper wall 522 faces bottom wall 512. Upper wall 522 covers the plurality of first power storage stacks 110, the plurality of second power storage stacks 120, first bus bar 210, second bus bar 220, first junction box 310, second junction box 320, first wiring 230, second wiring 240, and coolers 801, 802 (see FIG. 6 ).

[0038] 2, the breathing membrane 700 is provided on the case 500. The breathing membrane 700 is provided on the upper wall 522 of the upper cover 520. The breathing membrane 700 is made of, for example, Gore-Tex (registered trademark). The breathing membrane 700 adjusts the pressure inside the case 500 by allowing gas to pass between the inside and outside of the case 500.

[0039] For example, an increase in the temperature of the power storage device 1 may cause the internal pressure of the case 500 to become higher than the atmospheric pressure outside the case 500. At this time, the air inside the case 500 is discharged to the outside of the case 500 through the breathing membrane 700. Furthermore, depending on the external environment, the internal pressure inside the case 500 may become lower than the atmospheric pressure outside the case 500. At this time, outside air enters the case 500 through the breathing membrane 700.

[0040] That is, the breathing membrane 700 plays a role in maintaining the internal pressure within a certain range in the case 500. Furthermore, when the air within the case 500 is discharged to the outside of the case 500 through the breathing membrane 700, the water vapor contained in the air is also discharged to the outside of the case 500 through the breathing membrane 700. Therefore, the breathing membrane 700 also plays a role in ventilating the electricity storage device 1.

[0041] 4, position P1 indicates the position of breathing membrane 700 when upper cover 520 is attached to power storage device 1. Note that first bus bar 210, second bus bar 220, first wiring 230, and second wiring 240 shown in FIG. 3 are omitted from illustration in FIG.

[0042] 6, the breathing membrane 700 is provided in the upper cover 520 above the space S1, which is an air passage inside the case 500. Specifically, a through hole 524 is provided in the upper cover 520, and the breathing membrane 700 is attached to the upper wall 522 of the upper cover 520 so as to cover the through hole 524. As shown in FIG. 6, the breathing membrane 700 is provided above the inter-stack region R1 of the upper cover 520. Note that the breathing membrane 700 only needs to be provided above the space S1, which is an air passage inside the case 500, and does not necessarily have to be provided above the inter-stack region R1.

[0043] Referring to FIG. 7 , the breathing membrane 700 is provided on the upper cover 520 of the power storage device 1, which is disposed below the floor panel 4. That is, the breathing membrane 700 is disposed below the floor panel 4. More specifically, the floor panel 4 includes a center tunnel 41 extending in a first direction and flat portions 42 and 43 connected to the center tunnel 41. The flat portion 42 is disposed on the right side of the center tunnel 41. The flat portion 43 is disposed on the left side of the center tunnel 41. The center tunnel 41 includes an end portion 7 and an end portion 8 that are arranged at an interval in the first direction. The end portion 7 is closer to the front of the vehicle 10 than the end portion 8, and the end portion 8 is closer to the rear of the vehicle 10 than the end portion 7.

[0044] The breathing membrane 700 is disposed below the center tunnel 41 of the vehicle 10. A lid 6 is provided on at least one of the two ends 7, 8 of the center tunnel 41. In the example shown in Fig. 7, the lid 6 is provided on the end 7.

[0045] The lid 6 may be provided on the end portion 8. The lid 6 may also be provided on the end portion 7 and the end portion 8. The lid 6 may also be provided with a notch through which wiring or the like can pass. The lid 6 may not be provided on either the end portion 7 or the end portion 8. The breathing membrane 700 may also be disposed below the flat portion 42 or the flat portion 43.

[0046] The effects of the electricity storage device 1 in this embodiment will be described.

[0047] Effect (1) Generally, when a high-temperature energy storage cell is cooled, condensation water is generated. The condensation water evaporates and turns into water vapor, which is then discharged to the outside of the energy storage device through the breathable membrane. However, water vapor generated from condensation water generated far from the breathable membrane has difficulty reaching the breathable membrane and remains inside the energy storage device. The condensation water generated far from the breathable membrane is, for example, condensation water generated by cooling an energy storage cell far from the breathable membrane.

[0048] In contrast, in the energy storage device 1 of this embodiment, the breathing membrane 700 is provided in the upper cover 520 above the space S1 (see FIG. 3 ), which is an air passage inside the case 500. Therefore, even if condensed water generated far from the breathing membrane 700 is transformed into water vapor, it can reach the breathing membrane 700 by moving along the space S1. The water vapor that reaches the breathing membrane 700 is discharged to the outside of the case 500 through the breathing membrane 700. Therefore, according to the energy storage device 1 of this embodiment, water vapor is easily discharged to the outside of the case 500 through the breathing membrane 700. That is, according to the energy storage device 1 of this embodiment, ventilation of the energy storage device 1 is easy. Therefore, according to the energy storage device 1 of this embodiment, it is possible to prevent condensed water from continuously accumulating inside the energy storage device 1.

[0049] Effect (2) In the energy storage device 1 of this embodiment, the breathing membrane 700 is provided above the inter-stack region R1 (see FIG. 3 ) of the upper cover 520. The first bus bar 210 and the second bus bar 220 are arranged in the inter-stack region R1, so the inter-stack region R1 is prone to warming up. When air warms up, the dew point temperature rises, and the amount of moisture that the air can hold increases. That is, in the inter-stack region R1, which is prone to warming up, the amount of moisture that the air can hold is large. Therefore, water vapor is prone to collect in the inter-stack region R1. In the energy storage device 1 of this embodiment, the breathing membrane 700 is provided above the inter-stack region R1 of the upper cover 520, where water vapor is prone to collect. Therefore, according to the energy storage device 1 of this embodiment, water vapor is efficiently discharged to the outside of the case 500 through the breathing membrane 700.

[0050] Effect (3) In the energy storage device 1 of this embodiment, the respiratory membrane 700 is provided on the upper cover 520 of the energy storage device 1, which is disposed below the floor panel 4 (see FIG. 7). Therefore, adhesion of foreign matter to the respiratory membrane 700 is suppressed compared to when the respiratory membrane 700 is provided on the peripheral wall 514 of the case 500 (see FIG. 3). Foreign matter includes at least one of dust, stones, sand, and rainwater. When foreign matter adheres to the respiratory membrane 700, the breathability of the respiratory membrane 700 decreases. However, according to the energy storage device 1 of this embodiment, adhesion of foreign matter to the respiratory membrane 700 can be suppressed, and therefore the breathability of the respiratory membrane 700 is suppressed from decreasing.

[0051] Effect (4) In the electricity storage device 1 of this embodiment, the breathing film 700 is disposed below the center tunnel 41 (see FIG. 7). Therefore, it is possible to effectively prevent foreign matter from entering the area where the breathing film 700 is provided from the width direction (second direction) of the vehicle 10.

[0052] Effect (5) In the electricity storage device 1 of this embodiment, the lid 6 is provided on at least one of the two ends 7, 8 of the center tunnel 41. This makes it possible to effectively prevent foreign objects from entering the area where the breathing membrane 700 is provided from the front-to-rear direction (first direction) of the vehicle 10. When the lid 6 is provided on the end 7, it is possible to effectively prevent foreign objects from entering the area where the breathing membrane 700 is provided from the front of the vehicle 10. When the lid 6 is provided on the end 8, it is possible to effectively prevent foreign objects from entering the area where the breathing membrane 700 is provided from the rear of the vehicle 10. When the vehicle 10 is traveling, foreign objects are likely to enter from the front of the vehicle 10. Therefore, providing the lid 6 on the end 7 makes it possible to effectively prevent foreign objects from entering the area where the breathing membrane 700 is provided.

[0053] Effect (6) In the electricity storage device 1 of this embodiment, a lid 6 is provided on at least one of the two ends 7, 8 of the center tunnel 41. This suppresses vibrations inside the vehicle 10 while the vehicle 10 is traveling. Therefore, providing the lid 6 on the center tunnel 41 is more cost-effective than providing the electricity storage device 1 with a protective cover to protect the breathing membrane 700.

[0054] Effect (7) The power storage device 1 of this embodiment can prevent foreign matter from adhering to the respiratory membrane 700. Therefore, the power storage device 1 of this embodiment can prevent damage to the respiratory membrane 700.

[0055] Effect (8) According to the energy storage device 1 of this embodiment, adhesion of foreign matter to the breathing film 700 can be suppressed, and therefore, it is not necessary to provide the energy storage device 1 with a protective cover for protecting the breathing film 700. Therefore, according to the energy storage device 1 of this embodiment, the number of parts required for the energy storage device 1 can be reduced.

[0056] [Variations] Modified examples of the position of the breathing membrane 700 will be described with reference to Figs. 8 to 11. Fig. 8 is a perspective view schematically showing a power storage device according to the modified example. Fig. 9 is a plan view schematically showing a state in which the upper cover is removed from the power storage device according to the modified example. Fig. 10 is a cross-sectional view taken along line XX in Fig. 9. Fig. 11 is a cross-sectional view taken along line XI-XI in Fig. 9.

[0057] 8, the power storage device 1A in the modified example is also disposed below the floor panel 4 (see FIG. 1) of the vehicle 10 (see FIG. 1). In the power storage device 1A as well, the breathing membrane 700 is provided on the case 500. The breathing membrane 700 is provided on the upper wall 522 of the upper cover 520. With reference to FIG. 9, position P2 indicates the position of the breathing membrane 700 when the upper cover 520 is attached to the power storage device 1A. Note that the first bus bar 210, the second bus bar 220, the first wiring 230, and the second wiring 240 shown in FIG. 3 are not shown in FIG.

[0058] 11 , the respiratory membrane 700 is provided in the upper cover 520 above the space S1, which is an air passage within the case 500. Specifically, a through-hole 524 is provided in the upper cover 520, and the respiratory membrane 700 is attached to the upper wall 522 of the upper cover 520 so as to cover the through-hole 524. As shown in FIG. 11 , the respiratory membrane 700 is provided above the inter-box region R2 of the upper cover 520. As described above, the inter-box region R2 is a region located between the first junction box 310 and the second junction box 320. Note that the respiratory membrane 700 only needs to be provided above the space S1, which is an air passage within the case 500, and does not necessarily have to be provided above the inter-box region R2.

[0059] 10 and 11, the height of the first junction box 310 is lower than the height of the first power storage stack 110. The height of the first junction box 310 is the length of the first junction box 310 in the third direction. The height of the first power storage stack 110 is the length of the first power storage stack 110 in the third direction. Furthermore, the height of the second junction box 320 is lower than the height of the second power storage stack 120. The height of the second junction box 320 is the length of the second junction box 320 in the third direction. The height of the second power storage stack 120 is the length of the second power storage stack 120 in the third direction. Therefore, a larger space is formed in the inter-box region R2 than in the inter-stack region R1 (see FIG. 3). The breathing membrane 700 is provided in the upper cover 520 above the inter-box region R2 where the larger space is formed.

[0060] 7, in the modified example, the breathing membrane 700 is also arranged below the floor panel 4. In the modified example, the breathing membrane 700 is also arranged below the center tunnel 41. In the modified example, the lid 6 is also provided at the end portion 7.

[0061] In this modified example, the lid 6 may also be provided at the end 8. In this modified example, the lid 6 may also be provided at the end 7 and the end 8. In this modified example, the lid 6 may also be provided with a cutout portion through which wiring or the like can pass. In this modified example, the lid 6 may not be provided at either the end 7 or the end 8. In this modified example, the respiratory membrane 700 may also be arranged below the flat portion 42 or the flat portion 43.

[0062] Except for the position of the breathing membrane 700, the power storage device 1A in this modification is similar to the power storage device 1 (see FIG. 2).

[0063] As described above, in the power storage device 1A of the modified example, the breathing membrane 700 is provided in the upper cover 520 above the space S1 (see FIGS. 9 and 11), which is an air passageway inside the case 500. Therefore, even if condensed water generated far from the breathing membrane 700 is transformed into water vapor, it can reach the breathing membrane 700 by moving along the space S1. The water vapor that reaches the breathing membrane 700 is discharged to the outside of the case 500 through the breathing membrane 700. Therefore, according to the power storage device 1A of the modified example, water vapor is easily discharged to the outside of the case 500 through the breathing membrane 700. In other words, according to the power storage device 1A of the modified example, it is easy to ventilate the power storage device 1A. Therefore, according to the power storage device 1A of the modified example, it is possible to prevent condensed water from continuously accumulating inside the power storage device 1A.

[0064] Furthermore, in the power storage device 1A of the modified example, the breathing membrane 700 is provided above the inter-box region R2 of the upper cover 520. The first junction box 310 and the second junction box 320 heat up easily. Therefore, the inter-box region R2 located between the first junction box 310 and the second junction box 320 heats up easily. Furthermore, a portion of the first wiring 230 and a portion of the second wiring 240 are disposed in the inter-box region R2. Therefore, the inter-box region R2 heats up easily. In the inter-box region R2 that heats up easily, the air can contain a large amount of moisture. Therefore, water vapor tends to collect in the inter-box region R2. In the power storage device 1A of the modified example, the breathing membrane 700 is provided above the inter-box region R2 of the upper cover 520 where water vapor tends to collect. Therefore, according to the power storage device 1A of the modified example, water vapor is efficiently discharged to the outside of the case 500 through the breathing membrane 700.

[0065] In the energy storage device 1A of the modified example, the breathing membrane 700 is provided above the inter-box region R2 of the upper cover 520 where a large space is formed. Forming a large space at the position where the breathing membrane 700 is provided improves breathability. Therefore, according to the energy storage device 1A of the modified example, water vapor is efficiently discharged to the outside of the case 500 through the breathing membrane 700.

[0066] Moreover, the power storage device 1A in the modified example further achieves the above-mentioned effects (3) to (8).

[0067] 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 above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0068] 1, 1A Energy storage device, 3 Vehicle frame, 4 Floor panel, 6 Lid, 7, 8 End, 10 Vehicle, 41 Center tunnel, 42, 43 Flat portion, 110 First energy storage stack, 111 Energy storage cell, 111a Cell smoke exhaust valve, 120 Second energy storage stack, 210 First bus bar, 220 Second bus bar, 230 First wiring, 240 Second wiring, 310 First junction box, 312 First connector, 320 Second junction box, 322 Second connector, 500 Case, 510 Lower case, 512 Bottom wall, 514 Surrounding wall, 514a Side wall, 516 Partition, 520 Upper cover, 522 Top wall, 524 Through hole, 700 Breathing membrane, 801, 802 Cooler, P1, P2 Position, R1 Inter-stack area, R2 Interbox area, S1 space.

Claims

1. An electricity storage device, a first power storage stack; a second storage stack disposed at a distance from the first storage stack; a housing case including an upper cover and a lower case, the housing case housing the first power storage stack and the second power storage stack; a breathing membrane provided on the housing case; The power storage device has a space formed therein that extends in a first direction, the space passes through at least an inter-stack region located between the first power storage stack and the second power storage stack, The breathing membrane is provided above the space in the upper cover.

2. The power storage device according to claim 1 , wherein the breathing membrane is provided above the inter-stack region.

3. a first connection member electrically connected to the first power storage stack is connected to the first power storage stack; a second connection member electrically connected to the second power storage stack is connected to the second power storage stack; The power storage device according to claim 2 , wherein the first connecting member and the second connecting member are disposed in the inter-stack region.

4. When the arrangement direction of the first power storage stack and the second power storage stack is defined as a second direction, The power storage device is a first junction box disposed adjacent to the first power storage stack in the first direction; a second junction box arranged adjacent to the second power storage stack in the first direction and adjacent to the first junction box in the second direction, the first junction box is electrically connected to the first power storage stack; the second junction box is electrically connected to the second power storage stack; the space passes through an inter-box region located between the first junction box and the second junction box, The power storage device according to claim 1 , wherein the breathing membrane is provided above the inter-box region.

5. A vehicle equipped with the power storage device according to any one of claims 1 to 4, The breathing membrane is disposed below a center tunnel of the vehicle.

6. The vehicle according to claim 5, wherein a cover is provided on at least one end of the center tunnel.

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