Power storage device

Abstract

To provide a power storage device capable of suppressing the thermal effect of gas emitted from a power storage cell on a breathing membrane.SOLUTION: A power storage device 100 includes a storage cell 10 including an exhaust valve SV, a housing 20 that houses the storage cell 10, a breathing membrane 2, and a smoke exhaust valve 1. The housing 20 is formed with a cell space S10 in which the storage cell 10 is disposed. The smoke exhaust valve 1 is disposed in the smoke exhaust space S20 through which gas discharged from the exhaust valve SV flows. The breathing membrane 2 is disposed in an equipment space S30 that communicates with the cell space S10.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present disclosure relates to an electricity storage device. [Background technology]

[0002] Japanese Patent Laid-Open Publication No. 2006-228526 (Patent Document 1) discloses a battery pack including a battery case that houses a battery module and auxiliary components. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-228526 Summary of the Invention [Problem to be solved by the invention]

[0004] Although not described in Patent Document 1, the battery pack may be provided with a smoke exhaust valve for exhausting gas (smoke) emitted from the battery module (power storage cell) and a breathing membrane for adjusting the pressure inside the battery pack (housing). In this case, the thermal effect of the gas may be exerted on the breathing membrane.

[0005] The present disclosure has been made to solve the above-mentioned problems, and its purpose is to provide a storage device that can suppress the thermal effect of gas emitted from a storage cell on a respiratory membrane. [Means for solving the problem]

[0006] An electricity storage device according to one aspect of the present disclosure includes an electricity storage cell including an exhaust valve, a housing that houses the electricity storage cell, a breathing membrane, and a smoke exhaust valve. The housing defines a cell space in which the electricity storage cell is disposed. The smoke exhaust valve is disposed in a space through which gas discharged from the exhaust valve flows. The breathing membrane is disposed in the cell space or in a communication space that communicates with the cell space.

[0007] In the energy storage device according to one aspect of the present disclosure, as described above, the breathing membrane is disposed in the cell space or the communication space communicating with the cell space. Therefore, the breathing membrane is disposed in a space different from the space in which the smoke exhaust valve is disposed. As a result, the breathing membrane can be prevented from being affected by the heat of the gas discharged from the energy storage cells, compared to when the breathing membrane is disposed in the smoke exhaust space. [Effects of the Invention]

[0008] According to the present disclosure, it is possible to suppress the thermal influence of gases discharged from the power storage cells from affecting the breathing membrane. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a diagram schematically illustrating a vehicle including a power storage device according to an embodiment. [Figure 2] 1 is a perspective view showing an electricity storage device and a vehicle body according to an embodiment; [Figure 3] 1 is a cross-sectional view of an electricity storage device according to an embodiment, viewed from below. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. [Figure 5] FIG. 2 is a perspective view showing the configuration of a storage cell. [Figure 6] FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. [Figure 7] FIG. 5 is a partially enlarged view of the vicinity of the smoke exhaust valve in FIG. 4. [Figure 8] FIG. 2 is a plan view of the vicinity of the smoke exhaust valve as seen from below. [Figure 9] FIG. 3 is a first cross-sectional perspective view showing the configuration of a lower case and a fixing member. [Figure 10] FIG. 2 is a second cross-sectional perspective view showing the configuration of the lower case and the fixing member. [Figure 11] FIG. 10 is a cross-sectional view taken along line XI-XI in FIG. [Figure 12] FIG. 10 is a cross-sectional view taken along line XII-XII in FIG. 9. [Figure 13] FIG. 13 is a cross-sectional view taken along line XIII-XIII in FIG. 8. [Figure 14] FIG. 4 is a cross-sectional view showing the configuration of a power storage device according to a first modified example of an embodiment. [Figure 15] FIG. 10 is a cross-sectional view showing the configuration of a power storage device according to a second modified example of an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] 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.

[0011] An electricity storage device 100 according to an embodiment of the present disclosure will be described with reference to FIGS. 1 to 13. FIG. 1 is a side view schematically showing a vehicle 900 including the electricity storage device 100 according to this embodiment. In this specification, the X direction, Y direction, and Z direction are directions that are perpendicular to one another. For example, the X direction and the Y direction are the front-to-rear direction and the width direction of the vehicle 900 when the electricity storage device 100 is mounted on the vehicle 900, respectively. The X1 direction and the X2 direction are the front and rear of the vehicle, respectively. The Y1 direction and the Y2 direction are the left and right sides of the vehicle, respectively. The Z direction is the up-down (vertical) direction. The vehicle 900 is an example of an "electrically powered vehicle" according to the present disclosure.

[0012] As shown in FIG. 1 , the power storage device 100 includes an equipment unit 800. The vehicle 900 includes a vehicle body 910. Examples of the vehicle 900 include a hybrid electric vehicle, a plug-in hybrid electric vehicle, and an electric vehicle (battery electric vehicle). The vehicle body 910 includes a frame member 920. The frame member 920 is disposed on the bottom of the vehicle body 910. The equipment unit 800 is an example of an "electronic device" in the present disclosure.

[0013] As shown in FIG. 2, the frame member 920 has a pair of first frames 921, a pair of second frames 922, and a cross frame 923.

[0014] The pair of first frames 921 face each other in the X direction. In the example shown in Fig. 2, the first frame 921 disposed in the front (X1 side) has a shape that extends along the Y direction. The first frame 921 disposed in the rear (X2 side) has a shape that extends in the Y direction and is convex rearward.

[0015] The pair of second frames 922 face each other in the Y direction. Each second frame 922 has a shape extending along the X direction. An end of each second frame 922 in the X direction is connected to the first frame 921. The pair of second frames 922, together with the pair of first frames 921, form a substantially rectangular cylindrical frame that surrounds the power storage device 100.

[0016] The cross frame 923 is disposed between the pair of first frames 921 and connects the pair of second frames 922. The cross frame 923 forms, for example, a seat cross.

[0017] The front component member 930 is connected to a front portion of the frame member 920. The rear component member 940 is connected to a rear portion of the frame member 920. Each of the front component member 930 and the rear component member 940 may be formed by aluminum die casting.

[0018] The power storage device 100 is attached to a frame member 920. The power storage device 100 is disposed below a cross frame 923. The power storage device 100 includes four power storage stacks 110, a housing 20, and a cooler 70. The number of power storage stacks 110 is not limited to four.

[0019] Each power storage stack 110 is formed in the shape of a rectangular parallelepiped that is long in the X direction. The four power storage stacks 110 are arranged side by side along the Y direction.

[0020] 3 is a cross-sectional view of the energy storage device 100 as viewed from below. The energy storage device 100 includes a plurality of energy storage cells 10, a plurality of cross members 30, a plurality of support members 40, a plurality of inner seal portions 53, and a fixing member 60. Each energy storage stack 110 includes a plurality of (for example, 50) energy storage cells 10 arranged in the X direction.

[0021] The housing 20 houses at least one power storage cell 10. In this embodiment, the housing 20 houses four power storage stacks 110.

[0022] The housing 20 includes a lower case 21. The lower case 21 is open upward. The lower case 21 includes a peripheral wall portion 21a. The peripheral wall portion 21a is provided so as to collectively surround (the lower portions of) the multiple power storage stacks 110. In other words, the peripheral wall portion 21a is formed in an annular shape.

[0023] The peripheral wall portion 21a includes a side wall portion 21b, a side wall portion 21c, a side wall portion 21d, and a side wall portion 21e. The side wall portion 21b is disposed on the X1 side with respect to the four power storage stacks 110. The side wall portion 21c is disposed on the X2 side with respect to the four power storage stacks 110. The side wall portion 21d is disposed on the Y1 side with respect to the four power storage stacks 110. The side wall portion 21e is disposed on the Y2 side with respect to the four power storage stacks 110.

[0024] The lower case 21 includes a protruding portion 21f. The protruding portion 21f is provided so as to protrude from the side wall portion 21c. Specifically, the protruding portion 21f is provided so as to protrude from the upper end of the side wall portion 21c toward the X2 side.

[0025] The power storage device 100 includes a smoke vent valve 1 and a breathing membrane 2. The smoke vent valve 1 releases the pressure inside the housing 20. The smoke vent valve 1 opens when the pressure inside the housing 20 reaches or exceeds a reference value. The smoke vent valve 1 is configured as a check valve. The breathing membrane 2 adjusts the pressure inside the housing 20 by allowing gas (air) to pass through. Note that the smoke vent valve 1 does not have to be configured as a check valve. Furthermore, the breathing membrane 2 may be formed of, for example, Gore-Tex (registered trademark) or the like.

[0026] The smoke vent valve 1 and the breathing membrane 2 are each provided in the lower case 21. By providing the smoke vent valve 1 in the lower case 21, it is possible to discharge gas discharged from the smoke vent valve 1 downward. By providing the breathing membrane 2 in the lower case 21, it is possible to prevent rainwater and the like from adhering to the breathing membrane 2 from above.

[0027] Specifically, the smoke vent valve 1 and the breathing membrane 2 are each provided on the protruding portion 21f of the lower case 21. The smoke vent valve 1 is installed so as to exhaust gas downward (toward the Z2 side). The breathing membrane 2 extends along the XY plane, which is perpendicular to the up-down direction.

[0028] In this embodiment, the smoke vent valve 1 is provided adjacent to the breathing membrane 2 when viewed from a separation position P ( FIG. 4 ) spaced from the bottom surface 21j (described later) in a direction (Z direction) perpendicular to the bottom surface 21j on which the smoke vent valve 1 is provided. Specifically, when viewed from the separation position P, the smoke vent valve 1 is provided on the Y2 side of the breathing membrane 2. A distance D in the Y direction between the breathing membrane 2 and the smoke vent valve 1 is smaller than, for example, a width W1 in the Y direction of the energy storage cell 10.

[0029] The cross member 30 is provided between the power storage stacks 110 adjacent in the Y direction. The cross member 30 extends in the X direction. The cross member 30 extends longer in the X direction than the power storage stacks 110. The X1-side end of the cross member 30 protrudes toward the X1 side further than the X1-side end of the power storage stack 110. The X2-side end of the cross member 30 protrudes toward the X2 side further than the X2-side end of the power storage stack 110.

[0030] The support members 40 are arranged adjacent to each of the four power storage stacks 110 at both ends in the Y direction. The support members 40 are arranged between the power storage stack 110 closest to the Y1 side of the four power storage stacks 110 and the side wall 21d, and between the power storage stack 110 closest to the Y2 side of the four power storage stacks 110 and the side wall 21e. The support members 40 extend in the X direction, similar to the cross members 30.

[0031] The inner seal portion 53 is disposed at each of the Y1-side end and the Y2-side end of each power storage stack 110. The inner seal portion 53 extends in the X direction along the power storage stack 110. The inner seal portion 53 is bonded to the bottom surface of the power storage stack 110. Details of the inner seal portion 53 will be described later.

[0032] The fixing members 60 are fastened to the end plates 3 (FIG. 4) not shown in FIG. 3, thereby fixing the end plates 3. The fixing members 60 are arranged on the X1 side and the X2 side of each power storage stack 110.

[0033] The fixing members 60 are formed with a plurality of notches 60a into which the X-direction ends of the cross members 30 are inserted. The plurality of notches 60a are arranged side by side in the Y direction in each fixing member 60.

[0034] The fixing member 60 includes a plurality of fixing surfaces 61. An end plate 3 is fixed to each of the plurality of fixing surfaces 61. The plurality of fixing surfaces 61 are arranged side by side in the Y direction on each fixing member 60. A notch 60a is arranged between adjacent fixing surfaces 61 in the Y direction. Furthermore, adjacent fixing surfaces 61 in the Y direction are connected by a connecting portion 61a. The notch 60a is formed by the connecting portion 61a. Specifically, the notch 60a is formed by the connecting portion 61a and a pair of fixing surfaces 61 adjacent in the Y direction.

[0035] Fig. 4 is a cross-sectional view taken along line IV-IV in Fig. 3. As shown in Fig. 3, the power storage device 100 further includes a pair of end plates 3 and a monitoring unit 4 (Smart Battery Management).

[0036] The pair of end plates 3 sandwich at least one energy storage cell 10 from both sides in the X direction. In this embodiment, the pair of end plates 3 sandwich the multiple energy storage cells 10 of each energy storage stack 110 from both sides in the X direction. The monitoring unit 4 is disposed on the outer side of each end plate 3 in the X direction.

[0037] In addition to the lower case 21, the housing 20 has an upper cover 22, a panel member 23, and a device cover 830.

[0038] The upper cover 22 is disposed above at least one energy storage cell 10. In this embodiment, the upper cover 22 is disposed above the four energy storage stacks 110, and covers the four energy storage stacks 110 from above.

[0039] The upper cover 22, together with the lower case 21, houses the four power storage stacks 110. Specifically, the upper cover 22, together with the lower case 21, houses the four power storage stacks 110 in a sealed state. The peripheral edge of the upper cover 22 is connected to the peripheral edge of the lower case 21 by bolts or the like via a sealing member. The multiple power storage cells 10 (the four power storage stacks 110) are arranged in a cell space S10 formed by the upper cover 22 and the lower case 21. In addition to the multiple power storage cells 10, a pair of end plates 3, a monitoring unit 4, and the like may also be arranged in the cell space S10.

[0040] The panel member 23 is provided below the lower case 21. The panel member 23 has a function of protecting the lower case 21. The panel member 23 may be formed in a flat plate shape.

[0041] The lower case 21 includes a bottom surface portion 21g. The bottom surface portion 21g is disposed below the power storage stacks 110 and the pair of end plates 3, etc., and covers the power storage stacks 110 and the pair of end plates 3, etc. from below. The bottom surface portion 21g may be formed in a flat plate shape.

[0042] The peripheral wall portion 21a (FIG. 3) is provided so as to rise upward from the outer peripheral edge of the bottom surface portion 21g.

[0043] An exhaust valve SV is provided in each of the multiple energy storage cells 10. Gas generated in each energy storage cell 10 is discharged from the exhaust valve SV to the outside of the energy storage cell 10. The exhaust valve SV is provided on the bottom surface 11 of each energy storage cell 10. For simplicity, FIG. 4 illustrates the exhaust valve SV of only one energy storage cell 10. The bottom surface 11 is an example of an "exhaust valve arrangement surface" in the present disclosure.

[0044] In Figure 4, the arrow indicates the direction in which gas is discharged from the exhaust valve SV. The gas flows through a smoke exhaust space S20 formed in the housing 20. The gas that flows through the smoke exhaust space S20 is discharged to the outside of the housing 20 from a smoke exhaust valve 1 disposed in the smoke exhaust space S20. The smoke exhaust space S20 is an example of the "space through which gas flows" in the present disclosure.

[0045] The smoke exhaust space S20 includes a plurality of first smoke exhaust spaces S21, a second smoke exhaust space S22, and a connecting flow path S23. The connecting flow path S23 connects each of the first smoke exhaust spaces S21 and the second smoke exhaust space S22.

[0046] The first smoke exhaust space S21 is a space formed between the lower surfaces 11 of the plurality of energy storage cells 10 of each energy storage stack 110 and the bottom surface portion 21g of the lower case 21.

[0047] As described above, by forming the first smoke exhaust space S21 by the underside 11 of the storage cell 10, the number of parts of the storage device 100 can be reduced and the configuration of the storage device 100 can be simplified compared to when the first smoke exhaust space S21 is formed using a component separate from the storage cell 10.

[0048] The first smoke exhaust space S21 extends in the X direction. The first smoke exhaust space S21 functions as a smoke exhaust path. The first smoke exhaust space S21 is a path for discharging gas discharged from the exhaust valve SV of the energy storage cell 10 to the outside of the casing 20. Each first smoke exhaust space S21 is connected to a common space (connection flow path S23) within the casing 20 at an end of the first smoke exhaust space S21 in the X direction.

[0049] The smoke exhaust valve 1 is disposed in the second smoke exhaust space S22. That is, the smoke exhaust valve 1 exhausts gas in the second smoke exhaust space S22 to the outside of the second smoke exhaust space S22. When gas is exhausted from any of the energy storage cells 10, the gas spreads in the X direction through the first smoke exhaust space S21, moves to the second smoke exhaust space S22 via the connecting flow path S23, and is then exhausted to the outside of the housing 20 through the smoke exhaust valve 1.

[0050] The cooler 70 cools at least one energy storage cell 10. In this embodiment, the cooler 70 cools the plurality of energy storage cells 10 in each of the four energy storage stacks 110. The cooler 70 is disposed above the upper cover 22. A cooling medium (water, etc.) flows through the cooler 70.

[0051] The cooler 70 forms at least a part of a floor 950 of the vehicle interior C. In addition to the cooler 70, the floor 950 of the vehicle interior C may include a cushioning material, a carpet, etc., placed on the cooler 70. Note that the cushioning material, the carpet, etc. are not shown in FIG. 2.

[0052] The equipment unit 800 is disposed, for example, at an end in the X direction. Specifically, the equipment unit 800 is disposed on the rear part of the upper cover 22 in the front-rear direction of the vehicle 900. The equipment unit 800 has a junction box 812, an electricity supply unit 814, an electronic control unit 816, a unit cooler 824, and an equipment cover 830.

[0053] The junction box 812 is disposed above the upper cover 22. The junction box 812 houses a relay, a fuse, and the like.

[0054] The cooler 70 has an interposed portion 71 interposed between the upper cover 22 and the junction box 812. The junction box 812 is cooled by the interposed portion 71.

[0055] The power supply unit 814 is disposed above the junction box 812. The power supply unit 814 is cooled by a unit cooler 824 disposed on the upper surface of the power supply unit 814. The electronic control unit 816 is disposed above the junction box 812.

[0056] The equipment cover 830 houses the junction box 812 , the power supply unit 814 , the electronic control unit 816 , and the unit cooler 824 .

[0057] An equipment space S30 is formed inside the housing 20. The equipment space S30 is in communication with the cell space S10. The equipment space S30 is an example of a "communicating space" and a "space in which a breathing membrane is arranged" in the present disclosure.

[0058] The equipment space S30 includes a first equipment space S31 and a second equipment space S32. The first equipment space S31 is a space in which the equipment unit 800 is arranged. That is, the first equipment space S31 is a space inside the equipment cover 830. The first equipment space S31 is formed in a position adjacent to the passenger compartment C of the vehicle 900 in the X direction. The second equipment space S32 is an example of an "outside space" in the present disclosure.

[0059] The second equipment space S32 is a space below the first equipment space S31 and to the side (X2 side) of the cell space S10. The second equipment space S32 and the second smoke exhaust space S22 are adjacent to each other in the vertical direction with the partition plate 80 sandwiched therebetween. That is, the partition plate 80 partitions the second equipment space S32 from the second smoke exhaust space S22. A motor (rear motor) and auxiliary components (not shown) may be disposed in the second equipment space S32. A piping (not shown) for a coolant used in the unit cooler 824 may pass through the second equipment space S32. The partition plate 80 is an example of a "partition member" in the present disclosure.

[0060] The cell space S10 and the equipment space S30 are each isolated from the smoke exhaust space S20, which makes it possible to prevent gas flowing through the smoke exhaust space S20 from moving into the cell space S10 and the equipment space S30.

[0061] Each storage cell 10 includes an electrode assembly 10a. The electrode assembly 10a may be formed as a wound assembly in which a positive electrode sheet and a negative electrode sheet are wound with a separator interposed therebetween, or may be formed as a laminate in which a positive electrode sheet and a negative electrode sheet are stacked with a separator interposed therebetween. The electrode assembly 10a is formed in a shape that is elongated in the Y direction.

[0062] Fig. 5 is a perspective view showing the configuration of the energy storage cell 10. As shown in Fig. 5, each energy storage cell 10 has a bottom surface 11, as well as a top surface 12, short side surfaces 13, 14, long side surfaces 15, and long side surfaces 16.

[0063] The short side surfaces 13 and 14 are arranged in the Y direction. Specifically, the short side surfaces 13 and 14 are one end surface and the other end surface of the energy storage cell 10 in the Y direction, respectively.

[0064] The long side surfaces 15 and 16 are arranged in the X direction. Specifically, the long side surfaces 15 and 16 are one end surface and the other end surface of the energy storage cell 10 in the X direction, respectively.

[0065] The upper surface 12 and the lower surface 11 are arranged in the Z direction. Specifically, the upper surface 12 and the lower surface 11 are the end surface on the Z1 side and the end surface on the Z2 side of the energy storage cell 10, respectively.

[0066] The energy storage cell 10 has a cell case 17 and a pair of external terminals 18. The cell case 17 houses an electrode assembly 10a (FIG. 4). The bottom surface 11, the top surface 12, the short side surfaces 13, the short side surfaces 14, the long side surfaces 15, and the long side surfaces 16 are surfaces that constitute the cell case 17.

[0067] The cell case 17 is formed in a rectangular parallelepiped shape. The cell case 17 is made of a metal such as aluminum. The energy storage cell 10 is formed to be elongated in the Y direction. Specifically, the width W1 of the energy storage cell 10 in the Y direction is larger than the width W2 of the energy storage cell 10 in the X direction. The height H of the energy storage cell 10 is smaller than the width W1 and larger than the width W2.

[0068] The pair of external terminals 18 protrude in the Y direction from the short side surface 13 and the short side surface 14, respectively. The exhaust valve SV provided on the bottom surface 11 opens when the pressure of the smoke or gas inside the cell case 17 reaches or exceeds a certain level. In other words, the bottom surface 11 on which the exhaust valve SV is provided constitutes the pressure release surface of the cell case 17.

[0069] Fig. 6 is a cross-sectional view taken along line VI-VI in Fig. 4. The energy storage device 100 further includes a space defining portion 50 and a covering member 72. Note that Fig. 6 shows energy storage cells 10 of two adjacent energy storage stacks 110.

[0070] Each storage cell 10 has a cell body 10b. The cell body 10b has an electrode assembly 10a and a cell case 17. The thickness direction of the cell body 10b corresponds to the X direction. The width direction of the cell body 10b (a direction perpendicular to both the thickness direction and the up-down direction) corresponds to the Y direction.

[0071] 6, the upper cover 22 has an upper wall 22a. The upper wall 22a is provided above at least one energy storage cell 10. In this embodiment, the upper wall 22a is provided above four energy storage stacks 110. The upper wall 22a has a top portion 22b and four recesses 22c.

[0072] The top portion 22b is formed flat and overlaps the ends of each power storage stack 110 in the Y direction in the vertical direction.

[0073] Each recess 22c is recessed downward from the top portion 22b. Each recess 22c is formed flat. Each recess 22c is formed above the center portion in the Y direction of each energy storage stack 110. The length of each recess 22c in the Y direction is shorter than the length of the energy storage cell 10 in the Y direction. Each recess 22c is in contact with the upper surface of the cell casing 17 (upper surface 12 of the energy storage cell 10) via a thermally conductive adhesive 220.

[0074] The panel member 23 is provided below the bottom surface portion 21g of the lower case 21. The peripheral edge of the panel member 23 is connected to the lower case 21 via a bracket 24. In this embodiment, the bottom surface portion 21g of the lower case 21 and the panel member 23 form a "bottom wall 25."

[0075] The space defining portion 50, together with at least one energy storage cell 10 and the bottom wall 25, defines a first smoke exhaust space S21 below the at least one energy storage cell 10. In the present embodiment, the space defining portion 50, together with each energy storage stack 110 and the bottom wall 25, defines a first smoke exhaust space S21 below each energy storage stack 110. That is, in the present embodiment, four first smoke exhaust spaces S21 are formed inside the housing 20.

[0076] The space defining portion 50 is in contact with the lower surface 11 of at least one energy storage cell 10 and the bottom wall 25. The space defining portion 50 may support each energy storage stack 110. In this embodiment, the space defining portion 50 has a pair of base portions 51, a pair of lower surface contact portions 52, a pair of inner seal portions 53, and a pair of outer seal portions 54.

[0077] The pair of base portions 51 are connected to the bottom wall 25. In this embodiment, each base portion 51 is connected to the bottom surface portion 21g of the lower case 21. The pair of base portions 51 are arranged in positions facing each other in the Y direction (width direction) with the exhaust valve SV in between. Each base portion 51 has a connecting portion 51a and a raised portion 51b.

[0078] The connecting portion 51a is connected to the bottom surface portion 21g of the lower case 21. The connecting portion 51a is formed flat.

[0079] The raised portion 51b rises upward from the connecting portion 51a and is spaced apart from the bottom surface 21g of the lower case 21. The raised portion 51b is formed flat.

[0080] The pair of bottom contact portions 52 contact ends of the bottom surfaces 11 of the energy storage cells 10 in the Y direction (width direction). The pair of bottom contact portions 52 are arranged in positions facing each other in the Y direction with the exhaust valve SV in between. Each bottom contact portion 52 extends in the X direction. The pair of bottom contact portions 52 may have a function of restraining each energy storage stack 110. Portions of the bottom surfaces 11 of each energy storage cell 10 other than the portions in contact with the bottom contact portions 52 contact the first smoke exhaust space S21.

[0081] The pair of inner seal portions 53 are arranged at positions facing each other across the exhaust valve SV in the Y direction. Each inner seal portion 53 is in contact with the lower surface 11 of the energy storage cell 10 and the raised portion 51b of the base portion 51. Each inner seal portion 53 may be made of urethane resin.

[0082] The pair of outer seal portions 54 are disposed on the outer sides of the pair of inner seal portions 53 in the Y direction. Each outer seal portion 54 is in contact with the lower surface 11 of the energy storage cell 10 and the raised portion 51b of the base portion 51. Each outer seal portion 54 has an upper seal portion 54a and a lower seal portion 54b.

[0083] The upper seal portion 54a is provided between the lower surface 11 of each storage cell 10 and the lower surface contact portion 52. The lower seal portion 54b is provided between the lower surface contact portion 52 and the base portion 51 (raised portion 51b).

[0084] The pair of inner seal portions 53, the pair of outer seal portions 54, and the lower surface 11 of the energy storage cell 10 form a first smoke exhaust space S21.

[0085] The cross member 30 reinforces the bottom wall 25. The cross member 30 is disposed between a pair of cell bodies 10b adjacent to each other in the Y direction and below a pair of external terminals 18 adjacent to each other in the Y direction. The cross member 30 overlaps in the vertical direction with both of the pair of external terminals 18 facing each other in the Y direction.

[0086] The end of the cross member 30 in the X direction may be in contact with the peripheral wall portion 21a or may be spaced apart from the peripheral wall portion 21a. The cross member 30 is connected to the base portion 51. In this embodiment, the cross member 30 is connected to the raised portion 51b of the base portion 51 by welding or the like. The cross member 30 has a shape that is convex upward from the raised portion 51b. The end of the cross member 30 in the Y direction (a flange portion 33 described below) is sandwiched between the base portion 51 and the lower seal portion 54b. The sum of the thickness of the upper seal portion 54a, the thickness of the lower surface contact portion 52, the thickness of the lower seal portion 54b, and the thickness of the end of the cross member 30 is equal to the thickness of the inner seal portion 53.

[0087] The cross member 30 has a hat shape in a cross section taken along the Y direction. Specifically, the cross member 30 has an upper end surface portion 31, a pair of side surface portions 32, and a pair of flange portions 33. One and the other of the pair of side surface portions 32 are provided to extend downward from the Y1-side end and Y2-side end portions of the upper end surface portion 31, respectively. One of the pair of flange portions 33 on the Y1 side extends toward the Y1 side from the lower end of the Y1-side side surface portion 32. One of the pair of flange portions 33 on the Y2 side extends toward the Y2 side from the lower end of the Y2-side side surface portion 32.

[0088] The cooler 70 is provided on the upper wall 22a. More specifically, the cooler 70 is provided in the recess 22c of the upper wall 22a.

[0089] The cooler 70 is in thermal contact with at least one energy storage cell 10 via the upper wall 22a. In this embodiment, a thermally conductive adhesive 70a extending along the X direction is provided between the cooler 70 and the recess 22c. That is, in this embodiment, the cooler 70 is in thermal contact with each energy storage stack 110 via the upper wall 22a and the thermally conductive adhesive 70a. Note that being in thermal contact includes a case in which the cooler 70 is in contact with the energy storage cell 10 only via the upper wall 22a, and a case in which the cooler 70 is in indirect contact with the energy storage cell 10 via a thermally conductive member (such as an adhesive or a fixing member).

[0090] The covering member 72 covers the cooler 70. The covering member 72 may be made of a material having heat insulating properties. Note that the covering member 72 is not shown in Figures 2 and 4.

[0091] The covering member 72, together with the cooler 70, forms at least a part of a floor 950 (FIG. 4) of the vehicle interior C. In addition to the cooler 70 and the covering member 72, the floor 950 of the vehicle interior C may include floor constituent members (such as a shock absorber or carpet) placed on the covering member 72. Note that the floor constituent members are not shown in FIGS. 2 and 4.

[0092] Fig. 7 is a partially enlarged view of the vicinity of the smoke vent valve 1 in Fig. 4. The power storage device 100 further includes a mount member 5, a smoke detection thermistor 6, and an equipment circuit 7. The smoke detection thermistor 6 is an example of the "sensor" of the present disclosure.

[0093] In this embodiment, the smoke vent valve 1 is disposed above the lower surface 11 of the energy storage cell 10. As a result, even if an impact is applied to the energy storage device 100 from below, the smoke vent valve 1 is disposed at a relatively high position, so that the impact on the smoke vent valve 1 can be suppressed. As a result, damage to the smoke vent valve 1 can be suppressed.

[0094] Moreover, the smoke vent valve 1 is disposed below the upper surface 12 of the energy storage cell 10. This makes it possible to prevent the height of the energy storage device 100 in the vertical direction from increasing (to make the energy storage device 100 smaller) compared to when the smoke vent valve 1 is disposed above the upper surface 12.

[0095] The protruding portion 21f has a main body portion 21h and a recessed portion 21i. The recessed portion 21i is formed so as to be recessed downward from the main body portion 21h.

[0096] The recess 21i is formed by a bottom surface 21j and a peripheral wall 21k. The second smoke exhaust space S22 is formed by the bottom surface 21j, the peripheral wall 21k, and the partition plate 80. The bottom surface 21j is an example of a "smoke exhaust valve arrangement surface" of the present disclosure.

[0097] Bottom surface 21j extends horizontally below main body portion 21h. Peripheral wall 21k extends upward from the outer periphery of bottom surface 21j. Peripheral wall 21k connects bottom surface 21j and main body portion 21h.

[0098] The peripheral wall 21k surrounds the second smoke exhaust space S22 (smoke exhaust valve 1). The peripheral wall 21k is open on the X1 side, thereby connecting the second smoke exhaust space S22 to the connecting flow path S23.

[0099] The peripheral wall 21k includes a side wall 21l. The side wall 21l extends upward from the end of the bottom surface 21j on the X2 side.

[0100] The smoke vent valve 1 is disposed in the recess 21i. This allows the smoke vent valve 1 to be disposed further downward than when the smoke vent valve 1 is disposed in the main body 21h. As a result, the space above the smoke vent valve 1 can be made larger, making it easier to dispose other components in the space above the smoke vent valve 1.

[0101] Specifically, the smoke vent valve 1 is provided on the bottom surface 21j. More specifically, the smoke vent valve 1 is inserted into a through-hole 21m formed in the bottom surface 21j. This allows gas in the second smoke vent space S22 to be discharged to the outside through the smoke vent valve 1.

[0102] The main body 21h extends horizontally from the upper end of the peripheral wall 21k. The second device space S32 is formed by the main body 21h. The second device space S32 may be formed by the main body 21h and the upper cover 22.

[0103] The flue smoke detection thermistor 6 is disposed in the second flue smoke space S22. Specifically, the flue smoke detection thermistor 6 is disposed on the bottom surface 21j of the recessed portion 21i.

[0104] In this embodiment, the flue gas detection thermistor 6 is provided adjacent to the smoke vent valve 1 and on the opposite side (X2 side) of the smoke vent valve 1 from the energy storage cell 10. This allows the gas to reach the smoke vent valve 1 before reaching the flue gas detection thermistor 6, thereby preventing the gas from coming into direct contact with the flue gas detection thermistor 6. As a result, it is possible to prevent the flue gas detection thermistor 6 from failing due to the heat of the gas, debris, etc.

[0105] Specifically, the smoke detection thermistor 6 is disposed between the smoke vent valve 1 and the side wall 21l. The smoke detection thermistor 6 may be disposed closer to the smoke vent valve 1 than the center between the smoke vent valve 1 and the side wall 21l. This makes it possible to prevent debris accumulated at the bottom of the side wall 21l from coming into contact with the smoke detection thermistor 6. The position of the smoke detection thermistor 6 is not limited to the above example. For example, the smoke detection thermistor 6 may be attached to the inner surface of the side wall 21l.

[0106] The smoke detection thermistor 6 is electrically connected to the equipment circuit 7 by a wire harness 6a. This allows the smoke detection thermistor 6 and the equipment circuit 7 to transmit and receive signals and power through the wire harness 6a.

[0107] The partition plate 80 is formed with a through hole 81 through which the wire harness 6a passes. A small gap 81a is formed between the inner peripheral surface of the through hole 81 and the wire harness 6a. This allows air to move through the through hole 81 (gap 81a), unlike when no gap 81a is formed. As a result, air flowing in from the smoke vent valve 1 can be moved through the through hole 81 to the second equipment space S32. This makes it possible to prevent the air (oxygen) flowing in from the smoke vent valve 1 from moving toward the heat-generating energy storage cells 10.

[0108] Furthermore, compared to when the wire harness 6a is not inserted into the through-hole 81 (i.e., when the gap 81a is larger), the movement of gas through the through-hole 81 (gap 81a) can be suppressed. This makes it possible to suppress the movement of gas from the smoke exhaust space S20 to the second equipment space S32.

[0109] The mount member 5 is provided on the outer surface of the lower case 21. The smoke exhaust valve 1 is fixed to the lower case 21 by being fixed to the mount member 5. Specifically, the mount member 5 is provided on the outer surface of each of the side wall portion 21c and the protruding portion 21f (bottom surface 21j) of the lower case 21. The mount member 5 is fixed to the outer surface by welding or the like. The mount member 5 may be made of aluminum, for example.

[0110] By providing the mount members 5 on the outer surface of the lower case 21 as described above, external impacts applied to the lower case 21 can be absorbed by the mount members 5. As a result, damage to the lower case 21, the energy storage cells 10, etc. can be suppressed.

[0111] In detail, the mount member 5 includes a first portion 5a and a second portion 5b. The first portion 5a is provided on the outer surface of the side wall portion 21c of the lower case 21. The first portion 5a is provided along the side wall portion 21c. The second portion 5b is provided on the outer surface of the bottom surface 21j of the lower case 21. The second portion 5b is provided along the bottom surface 21j. The second portion 5b is provided so as to protrude from the upper end of the first portion 5a toward the X2 side. The second portion 5b is formed integrally with the first portion 5a. The mount member 5 has an L-shape in a cross section taken along the X direction.

[0112] As described above, by providing the second portion 5b on the mount member 5, the second portion 5b can effectively absorb the impact from the X2 side, which can more effectively prevent damage to the plurality of energy storage cells 10 arranged on the X1 side of the side wall portion 21c.

[0113] The second portion 5b is formed with a through-hole 5c into which the smoke vent valve 1 is inserted. That is, the smoke vent valve 1 passes through the through-hole 5c of the mount member 5 and the through-hole 21m of the bottom surface 21j, and is inserted into the second smoke vent space S22.

[0114] The mount member 5 has higher rigidity than the housing 20 (for example, the lower case 21). Specifically, the thickness t1 of the mount member 5 is greater than the thickness t2 of the lower case 21. Here, the thickness means the thickness of the metal plate forming each of the mount member 5 and the lower case 21.

[0115] 7, gas flows in the first smoke exhaust space S21 in the X2 direction. The side wall 21c has an opposing portion 21n located forward of the first smoke exhaust space S21 in the X2 direction. The smoke exhaust valve 1 is disposed above the opposing portion 21n.

[0116] This allows the smoke exhaust valve 1 to be positioned above the debris formed near the opposing portion 21n, thereby preventing the debris from flowing up to the smoke exhaust valve 1 compared to when the smoke exhaust valve 1 is positioned below or to the side of the debris.

[0117] The facing portion 21n is provided at the lower end of the side wall portion 21c. That is, the facing portion 21n is connected to the bottom surface portion 21g of the lower case 21. Therefore, debris formed near the facing portion 21n is deposited on the bottom surface portion 21g.

[0118] Furthermore, spacers 19 are disposed in the gaps between the energy storage cells 10 and in the gaps between the energy storage cells 10 and the end plates 3. This allows the spacers 19 to prevent gas flowing through the first smoke exhaust space S21 from leaking into the cell space through the gaps.

[0119] Figure 8 is a partially enlarged view from below of the vicinity of the smoke vent valve 1. As shown in Figure 8, each gas (shown by a dashed line in Figure 8) flowing through each first smoke vent space S21 flows into a second smoke vent space S22 in which the smoke vent valve 1 is provided.

[0120] In this embodiment, the breathing membrane 2 is disposed in the second equipment space S32. Specifically, the breathing membrane 2 is disposed in the main body 21h of the protruding portion 21f that forms the second equipment space S32. The breathing membrane 2 adjusts the internal pressure of the second equipment space S32 by allowing gas to pass through. The breathing membrane 2 allows gas to enter and exit the second equipment space S32.

[0121] As a result, the breathing film 2 is disposed in the second equipment space S32, which is different from the second smoke exhaust space S22 in which the smoke exhaust valve 1 is disposed, and therefore the influence of the heat of the gas on the breathing film 2 can be suppressed.

[0122] The second equipment space S32 is formed at a position separated from the vehicle interior C (FIG. 4) and adjacent to the outside of the vehicle 900. The outside of the vehicle 900 is the area below the protruding portion 21f. This makes it possible to prevent gas from flowing into the vehicle interior C through the breathing film 2, and also to discharge gas to the outside of the vehicle 900 through the breathing film 2.

[0123] 7, the second equipment space S32 in which the breathing membrane 2 (FIG. 8) is disposed is formed above the second smoke exhaust space S22 in which the smoke exhaust valve 1 is disposed. The smoke exhaust valve 1 is disposed below the breathing membrane 2 by the amount of downward recession of the recessed portion 21i.

[0124] This effectively prevents the gas from being emitted downward from the smoke vent valve 1 from affecting the breathing membrane 2, which is located above the smoke vent valve 1. As a result, the thermal effect of the gas on the breathing membrane 2 can be further reduced.

[0125] The fixing member 60 is fastened by a bolt 3b to the lower surface 3a of the end plate 3. The fixing member 60 extends from the end plate 3 along the bottom surface 21g and side wall 21c of the lower case 21.

[0126] In this embodiment, the fixing member 60 forms a connection flow path S23 between the bottom surface portion 21g of the lower case 21 and the side wall portion 21c.

[0127] This allows the number of parts of the energy storage device 100 to be reduced and the configuration of the energy storage device 100 to be simplified compared to when the member for fixing the end plate 3 and the member for forming the connection flow path S23 are provided separately.

[0128] Specifically, the fixing member 60 includes, in addition to the fixing surface 61, a side surface 62 and an upper end surface 63. The fixing surface 61, the side surface 62 and the upper end surface 63 are integrally formed. The fixing member 60 is made of metal (for example, iron).

[0129] The fixing surface 61 is fastened to the lower surface 3a of the end plate 3. The fixing surface 61 extends from the lower surface 3a of the end plate 3 toward the X2 side (the side wall portion 21c side). The fixing surface 61 extends along the bottom surface portion 21g of the lower case 21.

[0130] The side surface 62 extends upward from an end 61a on the X2 side of the fixing surface 61. The side surface 62 extends along the side wall 21c of the lower case 21. A part of the upper end 62a of the side surface 62 is located higher than the bottom surface 21j of the lower case 21 (the upper end of the side wall 21c). The side surface 62 also extends in the Y direction. The monitoring unit 4 is disposed in the gap between the side surface 62 and the end plate 3.

[0131] The upper end surface 63 extends from the upper end portion 62a of the side surface 62 toward the X2 side. The upper end surface 63 extends horizontally. The upper end surface 63 also extends in the Y direction. The upper end surface 63 may be provided at the same position as the main body portion 21h of the overhanging portion 21f in the Z direction.

[0132] An upper end portion 62a of the side surface 62 is located closer to the X1 side than the bottom surface 21j (and the side wall portion 21c) of the lower case 21. Therefore, at least a portion of the upper end surface 63 is located closer to the X1 side than the bottom surface 21j (and the side wall portion 21c). As a result, gas flowing along the side wall portion 21c collides with (comes into contact with) the upper end surface 63 and then moves toward the second smoke exhaust space S22 (X2 side).

[0133] An end 82 on the X1 side of the partition plate 80 is fixed to the upper end surface 63. The outer peripheral edge (on the lower surface) of the partition plate 80 may be connected to each of the upper end surface 63 and the main body portion 21h by bolts or the like via sealing members.

[0134] 9 is a cross-sectional perspective view showing the configuration of lower case 21 and fixing member 60. An upper end surface 63 of fixing member 60 is connected to an upper surface 21o of main body portion 21h of protruding portion 21f. Upper end surface 63 and upper surface 21o may be connected by adhesive, welding, or the like. This makes it possible to prevent gas from escaping between upper end surface 63 and upper surface 21o.

[0135] The fixing member 60 includes a plurality of legs 64 (only one is shown in FIG. 9 ). The leg 64 is connected to both ends in the Y direction of each of the plurality of fixing surfaces 61. Each of the plurality of legs 64 extends downward from the fixing surface 61.

[0136] The side surface 62 of the fixing member 60 includes a vertical surface 62b and an inclined surface 62c. The vertical surface 62b extends upward from the end portion 61b (and connecting portion 61a) of the fixing surface 61. The vertical surface 62b extends perpendicular to the horizontal plane.

[0137] The inclined surface 62c extends upward from an upper end 62d of the vertical surface 62b. The inclined surface 62c is inclined so as to approach the side wall 21c of the lower case 21 as it extends upward from the upper end 62d. In other words, the distance between the side wall 21c and the inclined surface 62c becomes smaller as it extends upward. The inclined surface 62c is connected to the upper end surface 63.

[0138] Therefore, the side surface 62 is bent at the boundary between the vertical surface 62b and the inclined surface 62c. In the Z direction, the upper end portion 62d of the vertical surface 62b may be located at the same position as the upper end surface portion 31 of the cross member 30. The side surface 62 may be formed flat without being bent.

[0139] Fig. 10 is a diagram showing a state in which the recessed portion 21i is covered from above by the partition plate 80, following the state shown in Fig. 9. As a result, the recessed portion 21i is sealed.

[0140] Fig. 11 is a cross-sectional view taken along line XI-XI in Fig. 9. As shown in Fig. 11, support members 40 provided along side wall portions 21d and 21e support leg portions 64 of fixing member 60 from below. In addition, flange portions 33 of cross member 30 support leg portions 64 from below.

[0141] The leg portion 64 of the fixing member 60 includes a contact portion 64a and a connection portion 64b. The contact portion 64a is joined to the flange portion 33 of the cross member 30 or the support member 40 by adhesive, welding, or the like. This makes it possible to prevent gas flowing below the fixing surface 61 from escaping between the cross member 30 and the support member 40 and the leg portion 64. The contact portion 64a extends in both the X direction and the Y direction.

[0142] The connecting portion 64b connects the fixed surface 61 and the contact portion 64a. The connecting portion 64b extends in both the X direction and the Z direction.

[0143] Fig. 12 is a cross-sectional view taken along line XII-XII in Fig. 9. The electricity storage device 100 includes an adhesive material 8. The adhesive material 8 bonds the cross member 30 and the fixing member 60 together. Note that instead of the adhesive material 8, a sealing member such as a gasket may be provided.

[0144] An end 30a of the cross member 30 in the X direction (the X2 side in FIG. 12) is in contact with a connecting portion 61a of the fixing member 60. An adhesive material 8 is disposed (filled) in the gap formed between the end 30a and the vertical surface 62b. This makes it possible to prevent gas from escaping from the gap between the cross member 30 and the fixing member 60.

[0145] 13 is a cross-sectional view of the breathable membrane 2. The breathable membrane 2 includes a cap 2a, a bottom 2b, a breathable membrane 2c, and an O-ring 2d. The bottom 2b of the breathable membrane 2 penetrates a through-hole 21p of the main body 21h. The bottom 2b has a first portion 2e located on the Z2 side of the through-hole 21p and a second portion 2f extending from the flange 2e to the Z1 side and penetrating the through-hole 21p. The first portion 2e has, for example, a flange shape. The second portion 2f has, for example, a tubular (e.g., cylindrical) shape that allows gas to pass through.

[0146] The O-ring 2d surrounds the bottom 2b (second portion 2f). The O-ring 2d is sandwiched between the outer peripheral surface of the second portion 2f and the inner peripheral surface of the through-hole 21p. The O-ring 2d is made of, for example, a silicone-based sealing material.

[0147] The cap 2a covers the bottom 2b from the Z1 side. The breathable membrane 2c is provided between the cap 2a and the flange portion 2e of the bottom 2b. Gas flows into (and out of) the housing 20 (FIG. 4) by passing through the breathable membrane 2c and the second portion 2f of the bottom 2b.

[0148] The configuration of the breathing membrane 2 is not limited to the example shown in FIG.

[0149] In the energy storage device 100 configured as described above, the breathing membrane 2 is disposed in the equipment space S30 communicating with the cell space S10, and adjusts the internal pressure of the equipment space S30 by allowing gas to pass through. As a result, the smoke vent valve 1 and the breathing membrane 2 are disposed in different spaces, and therefore, heat from the gas flowing through the smoke vent space S20 where the smoke vent valve 1 is provided can be prevented from being transmitted to the breathing membrane 2, and as a result, deterioration of the breathing membrane 2 due to heat can be prevented.

[0150] [Variations] In the above embodiment, an example has been shown in which the smoke vent valve 1 is disposed on the protruding portion 21f of the lower case 21, but the present disclosure is not limited to this. The smoke vent valve 1 may be disposed at a location other than the protruding portion 21f.

[0151] A specific description will be given with reference to the example shown in Fig. 14. The power storage device 200 differs from the power storage device 100 of the above embodiment in that it includes a housing 120 including a lower case 121 and a fixing member 160. The lower case 121 includes a bottom surface 21g, a side wall 21c, and a protruding portion 121f. The protruding portion 121f protrudes from the upper end of the side wall 21c toward the X2 side. The second portion 5b of the mount member 5 is provided on the protruding portion 121f. Note that the protruding portion 121f does not have a recess like the recessed portion 21i of the above embodiment, but is formed like a flat surface.

[0152] The smoke vent valve 1 is provided on the side wall portion 21c. Specifically, the smoke vent valve 1 penetrates the side wall portion 21c and the first portion 5a of the mounting member 5 and is inserted into the inside of the lower case 121. The smoke vent valve 1 is disposed above the bottom surface 11 of the energy storage cell 10.

[0153] The fixing member 160 includes a fixing surface 61, a side surface 162, and an upper surface 163. The side surface 162 extends upward from an end portion 61a of the fixing surface 61. The upper surface 163 extends from the upper end of the side surface 162 to the side wall portion 21c of the lower case 121. The upper surface 163 and the side wall portion 21c may be connected by adhesive, welding, or the like. The upper surface 163 is located below the protruding portion 121f of the lower case 121.

[0154] The lower case 121, the plurality of energy storage cells 10, and the fixing member 160 form a smoke exhaust space S120. The smoke exhaust space S120 includes a first smoke exhaust space S21, a second smoke exhaust space S122, and a connecting flow path S123. The second smoke exhaust space S122 is a space between the smoke exhaust valve 1 and the side surface 162. The connecting flow path S123 connects the first smoke exhaust space S21 and the second smoke exhaust space S122. Gas exhausted from the energy storage cells 10 passes through the first smoke exhaust space S21, the connecting flow path S123, and the second smoke exhaust space S122, and is then exhausted from the smoke exhaust valve 1. The smoke exhaust space S120 is an example of a "space through which gas flows" in the present disclosure.

[0155] The smoke exhaust detection thermistor 6 may be attached, for example, to the inner surface (the surface on the second smoke exhaust space S122 side) of the upper surface 163 of the fixing member 60. In this case, the smoke exhaust detection thermistor 6 may be disposed above the smoke exhaust valve 1.

[0156] In the above embodiment, an example in which the breathing membrane 2 is disposed in the equipment space S30 has been shown, but the present disclosure is not limited to this. The breathing membrane 2 may be disposed in a space other than the equipment space S30.

[0157] 15, the breathing membrane 2 may be disposed in the cell space S10. Specifically, in the example shown in Fig. 15, the breathing membrane 2 is provided on the side wall 21e on the Y2 side of the lower case 21. For example, the breathing membrane 2 is disposed closer to the energy storage cell 10 (X1 side) than the side surface 62 of the fixing member 60 and above the fixing surface 61 of the fixing member 60.

[0158] In the above embodiment, an example in which the breathing membrane 2 is disposed in the second equipment space S32 has been described, but the present disclosure is not limited to this. The breathing membrane 2 may be disposed in the first equipment space S31.

[0159] In the above embodiment, an example has been shown in which the power storage device 100 is mounted on the vehicle 900, but the present disclosure is not limited to this. The power storage device 100 may also be mounted on an electrical device other than a vehicle (for example, a stationary power storage device).

[0160] In the above embodiment, an example has been shown in which the smoke vent valve 1 discharges gas downward, but the present disclosure is not limited to this. The smoke vent valve 1 may discharge gas in a direction other than downward (for example, backward).

[0161] In the above embodiment, an example in which the smoke vent valve 1 and the breathing membrane 2 are provided adjacent to each other has been shown, but the present disclosure is not limited to this. The smoke vent valve 1 and the breathing membrane 2 may not be adjacent to each other and may be spaced apart from each other.

[0162] In the above embodiment, an example has been shown in which the smoke detection thermistor 6 is provided adjacent to the smoke vent valve 1, but the present disclosure is not limited to this. The smoke detection thermistor 6 and the smoke vent valve 1 may not be adjacent to each other and may be spaced apart from each other.

[0163] In the above embodiment, an example has been described in which the first smoke exhaust space S21 is formed by the lower surface 11 of the energy storage cell 10, but the present disclosure is not limited to this. For example, the first smoke exhaust space S21 may be formed by a member disposed below the energy storage cell 10.

[0164] In the above embodiment, the breathing membrane 2 and the smoke vent valve 1 are provided on the lower case 21, but the present disclosure is not limited to this. At least one of the breathing membrane 2 and the smoke vent valve 1 may be provided on, for example, the upper cover 22 and the panel member 23, etc.

[0165] In the above embodiment, an example has been shown in which the mount member 5 to which the smoke vent valve 1 is fixed is provided on the power storage device 100, but the present disclosure is not limited to this. The mount member 5 does not have to be provided on the power storage device 100.

[0166] In the above embodiment, an example has been shown in which the thickness t1 of the mount member 5 is greater than the thickness t2 of the lower case 21, thereby making the mount member 5 more rigid than the lower case 21, but the present disclosure is not limited to this. The mount member 5 may be formed from a material that is more rigid than the lower case 21, thereby making the mount member 5 more rigid than the lower case 21.

[0167] In the above embodiment, an example was shown in which the mount member 5 includes the first portion 5a and the second portion 5b, but the present disclosure is not limited to this. The mount member may have only one of the first portion 5a and the second portion 5b.

[0168] In the above embodiment, the smoke exhaust space S20 (connection flow path S23) is formed by the fixing member 60 that fixes the end plate 3, but the present disclosure is not limited to this. The smoke exhaust space S20 (connection flow path S23) may be formed by a member separate from the fixing member that fixes the end plate 3.

[0169] In the above embodiment, the breathing membrane 2 is disposed in the equipment space S30 that communicates with the cell space S10, but the present disclosure is not limited to this. The breathing membrane 2 may be disposed in a space that communicates with the cell space S10 but is different from the equipment space S30.

[0170] The configurations of the above-described embodiment and the above-described various modified examples may be combined with each other.

[0171] It should be noted that the embodiments disclosed herein are illustrative in all respects and should not be considered limiting. The scope of the present disclosure is defined by the claims rather than the description of the above embodiments, and further includes all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0172] 1 smoke exhaust valve, 2 breathing membrane, 3 end plate, 5 mounting member, 5a first part, 5b second part, 6 smoke exhaust detection thermistor (sensor), 10 power storage cell, 11 bottom surface (exhaust valve arrangement surface), 20, 120 housing, 21, 121 lower case, 21c side wall portion, 21f, 121f protrusion portion, 21g bottom surface portion, 21h main body portion, 21i recess portion, 21j bottom surface (smoke exhaust valve arrangement surface), 21n opposing portion, 60, 160 fixing member, 80 partition plate (partition member), 81 through hole, 81a gap, 100, 200 power storage device, 800 equipment unit (electronic device), 900 vehicle (electric vehicle), C vehicle compartment, S10 cell space, S20, S120 smoke exhaust space, S21 First smoke exhaust space, S22, S122 second smoke exhaust space, S23, S123 connecting flow path, S30 equipment space (communicating space) (space where breathing membrane is located), S32 second equipment space (outer space), SV smoke exhaust valve.

Claims

1. an energy storage cell including an exhaust valve; a housing that houses the power storage cell; Respiratory membrane and A power storage device equipped with a smoke exhaust valve, a cell space in which the power storage cell is disposed is formed in the housing; The smoke exhaust valve is disposed in a space through which gas discharged from the exhaust valve flows, The breathing membrane is disposed in the cell space or in a communication space communicating with the cell space.

2. Further equipped with electronic equipment, the communication space includes an equipment space in which the electronic device is placed, The power storage device according to claim 1 , wherein the breathing membrane is disposed in the equipment space.

3. The power storage device is mounted on an electric vehicle, the equipment space includes an outer space formed at a position separated from a vehicle interior of the electric vehicle and adjacent to an exterior of the electric vehicle, The power storage device according to claim 2 , wherein the breathing membrane is disposed in the outer space.

4. The smoke exhaust valve discharges the gas downward, The power storage device according to claim 2 or 3, wherein the equipment space is formed above the space through which the gas flows.

5. The device further includes a partition member that partitions a space in which the breathable membrane is disposed from the space through which the gas flows, The housing includes a smoke exhaust valve arrangement surface on which the smoke exhaust valve is arranged, The smoke exhaust valve is provided adjacent to the breathing membrane when viewed from a position spaced apart from the smoke exhaust valve arrangement surface in a direction perpendicular to the smoke exhaust valve arrangement surface, 4. The power storage device according to claim 1, wherein a gap is formed in a portion of the partition member that is located between the breathing membrane and the smoke exhaust valve.

6. a sensor disposed in the space through which the gas flows and configured to detect the gas; 4. The electricity storage device according to claim 1, wherein the sensor is provided adjacent to the smoke exhaust valve and on an opposite side of the smoke exhaust valve from the electricity storage cell.

7. the energy storage cell includes an exhaust valve arrangement surface on which the exhaust valve is provided, 4. The electricity storage device according to claim 1, wherein the space through which the gas flows is defined by the exhaust valve arrangement surface.

8. the housing includes a lower case that covers the storage cells from below, the exhaust valve arrangement surface includes a lower surface of the energy storage cell, the space through which the gas flows is formed by the lower case and the bottom surface, The power storage device according to claim 7 , wherein the breathing membrane is provided on the lower case.

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