Power storage device

Abstract

Provided is a power storage device including a release valve and an air-permeable waterproof member, wherein the influence of a high-temperature gas or the like on the air-permeable waterproof member is reduced. The power storage device comprises: a storage case (2); a power storage unit (3) provided inside the storage case (2); a partition wall provided inside the storage case (2) and partitioning the inside of the storage case (2) into a first region (20) and a second region (21); a release valve provided to the storage case (2); and an air-permeable waterproof member (6) provided to the storage case (2). The power storage unit (3) is provided within the first region (20) inside the storage case (2). The release valve and the air-permeable waterproof member (6) are provided on a section which is part of an outer surface of the storage case (2) and which defines the second region (21).

Description

Power storage device

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

[0002] Various proposals have been made for electric storage devices provided with release valves. The electric storage device described in JP-A-2022-516519 includes a housing case and a plurality of electric storage units disposed within the housing case. A plurality of release valves are provided on the periphery of the housing case. The release valves open when the internal pressure within the housing case reaches or exceeds a predetermined level, and by opening the release valves, the internal pressure of the housing case can be reduced.

[0003] Special Publication No. 2022-516519

[0004] In the above-described electricity storage device, the timing at which the open valve opens is, for example, the timing at which exhaust gas is ejected from the electricity storage unit.

[0005] On the other hand, a rise in the temperature of the power storage unit inside the storage case may cause the internal pressure inside the storage case to become higher than the external pressure outside the storage case, or, depending on the conditions inside the storage case, the internal pressure inside the storage case may become lower than the external pressure.

[0006] Therefore, in order to adjust the internal pressure inside the storage case, it is conceivable to place a breathable waterproof member inside the storage case.

[0007] On the other hand, in the above-mentioned Japanese Patent Publication No. 2022-516519 and the like, the relative positions of the open valve and the breathable waterproof member are not taken into consideration.

[0008] Therefore, there is a risk of adverse effects such as the breathable waterproof member being exposed to high-temperature gas when the open valve opens.

[0009] The present disclosure has been made in consideration of the above-mentioned problems, and its purpose is to provide an energy storage device equipped with an open valve and a breathable waterproof member in which the breathable waterproof member is less susceptible to the effects of high-temperature gases and the like.

[0010] The energy storage device comprises a storage case, an energy storage unit provided within the storage case, a partition wall provided within the storage case that divides the interior of the storage case into a first area and a second area, an open valve provided on the storage case, and a breathable waterproof member provided on the storage case, wherein the energy storage unit is provided on a first portion of the outer surface of the storage case that defines the first area, and the open valve and the breathable waterproof member are provided on a second portion of the outer surface of the storage case that defines the second area.

[0011] If the direction from the first region toward the second region is defined as an arrangement direction, the breathable waterproof member is located forward of the open valve in the arrangement direction.

[0012] The storage case includes a side wall positioned in the arrangement direction relative to the partition wall, and the breathable waterproof member is provided on the side wall.

[0013] The power storage device further includes an electric device provided in the second area, and the breathable waterproof member is provided in a portion of the side wall adjacent to the electric device in the arrangement direction.

[0014] The second gap space in the second area where no electrical device 4 is provided is larger than the first gap space in the first area where no power storage unit is provided.

[0015] The power storage device further includes an electric device provided in the second region, and the breathable waterproof member is provided in a portion of the second region away from an adjacent portion adjacent to the electric device in the forward direction of the arrangement direction. The partition wall 17 is higher than the power storage unit.

[0016] The storage case includes a lower case provided with a partition wall and an upper case disposed above the lower case, and the release valve is provided in the upper case.

[0017] If the direction from the first region to the second region is defined as the arrangement direction and the direction intersecting the arrangement direction is defined as the width direction, the storage unit includes a first storage module and a second storage module arranged at a distance in the width direction, the storage case includes a side wall positioned in the arrangement direction relative to the second region, and a connecting wall extending in the arrangement direction, passing between the first storage module and the second storage module, and connected to the side wall, a hollow cavity portion formed inside the connecting wall, and the breathable waterproof member is provided on the side wall and is provided so as to communicate with the hollow portion.

[0018] When the open valve and the connecting wall are viewed from above, a through-hole is formed in the connecting wall on the forward side in the arrangement direction of the open valve.

[0019] According to the electricity storage device according to the present disclosure, in an electricity storage device including an open valve and a breathable waterproof member, it is possible to suppress the influence of high-temperature gas and the like on the breathable waterproof member.

[0020] 1 is an exploded perspective view showing an energy storage device 1 according to the first embodiment; FIG. 2 is an exploded perspective view showing the configuration of a side wall 25, an electric device 4, and their surroundings; FIG. 3 is a plan view showing the configuration of a side wall 25, an electric device 4, and their surroundings; FIG. 4 is a cross-sectional view showing the configuration of a breathable waterproof member 6, a side wall 25, and their surroundings; FIG. 5 is an exploded perspective view showing the configuration of a side wall 25, an electric device 4, and their surroundings in an energy storage device 1A; FIG. 6 is a cross-sectional view showing a breathable waterproof member 6A, etc.; FIG. 7 is an exploded perspective view showing an energy storage device 1B; FIG. 8 is an exploded perspective view showing the configuration of a side wall 25, an electric device 4, and their surroundings in an energy storage device 1C; and FIG. 9 is an exploded perspective view showing an energy storage device 1D.

[0021] 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.

[0022] 1 is an exploded perspective view showing an energy storage device 1 according to the present embodiment 1. The energy storage device 1 includes a housing case 2, an energy storage unit 3 and an electrical device 4 housed in the housing case 2, an open valve 5, and an air-permeable waterproof member 6.

[0023] The storage case 2 is elongated in the front-rear direction L1. In other words, the storage case 2 is longer in the front-rear direction L1 than in the width direction L2. The storage case 2 includes a lower case 10 and an upper case 11.

[0024] The lower case 10 is formed to open upward. The upper case 11 is disposed above the lower case 10 and closes the opening of the lower case 10. An accommodation space for accommodating the power storage unit 3 and the electrical device 4 is formed within the accommodation case 2.

[0025] The lower case 10 includes a bottom plate 15 , a peripheral wall 16 , partition walls 17 and 18 , and a connecting wall 19 .

[0026] The bottom plate 15 is formed in a plate shape. The peripheral wall 16 is formed on the upper surface of the bottom plate 15. The peripheral wall 16 is formed in an annular shape. The peripheral wall 16 includes a side wall 25, a side wall 26, a long side wall 27, and a long side wall 28.

[0027] The side walls 25 and 26 are spaced apart in the front-to-rear direction L1. The side walls 25 and 26 are formed to extend in the width direction L2. The side walls 25 and 26 are spaced apart in the front-to-rear direction L1. The long side walls 27 and 28 are spaced apart in the front-to-rear direction L1. The long side walls 27 and 28 are formed to extend in the front-to-rear direction L1.

[0028] The connecting wall 19 is disposed so as to pass through the center of the lower case 10 in the width direction L2. The connecting wall 19 is hollow. A hollow portion 12 extending in the front-rear direction L1 is formed within the connecting wall 19. The connecting wall 19 is formed so as to extend in the front-rear direction L1. One end of the connecting wall 19 is connected to the side wall 25. The other end of the connecting wall 19 is connected to the side wall 26. The height of the connecting wall 19 is lower than the heights of the partition walls 17, 18 and the peripheral wall 16.

[0029] The partition walls 17, 18 divide the storage space within the storage case 2 into a battery area 20 and an equipment area 21. The partition walls 17, 18 are disposed forward of the center of the lower case 10 in the front-to-rear direction L1. The partition wall 17 is formed to extend in the width direction L2.

[0030] The partition walls 17 and 18 are spaced apart in the width direction L2, and the upper end surfaces of the partition walls 17 and 18 are in contact with the upper case 11.

[0031] A connecting wall 19 is disposed between the partition walls 17 and 18. The height of the connecting wall 19 is lower than that of the partition walls 17 and 18, so a gap is formed between the partition walls 17 and 18 on the upper surface of the connecting wall 19. The partition wall 17 is connected to the connecting wall 19 and the long side wall 27. The partition wall 18 is connected to the connecting wall 19 and the long side wall 28. The equipment area 21 is divided by the connecting wall 19 into a divided area 22 and a divided area 23.

[0032] The volume of the battery area 20 is larger than the volume of the equipment area 21. The arrangement direction D1 is the direction from the battery area 20 toward the equipment area 21. In the first embodiment, the arrangement direction D1 is one direction of the front-rear direction L1. Specifically, the arrangement direction D1 is the forward direction.

[0033] Here, the housing case 2 includes a first portion 33 that defines the battery area 20 and a first portion 34 that defines the equipment area 21 .

[0034] The first portion 33 includes the peripheral wall 16 and a portion of the upper case 11 that is located forward of the partition walls 17 and 18 in the arrangement direction D1.

[0035] The second portion 34 includes the partition walls 17 and 18, and portions of the peripheral wall 16 and the upper case 11 that are located further forward in the arrangement direction D1 than the partition walls 17 and 18.

[0036] The energy storage unit 3 is disposed in the battery area 20. The energy storage unit 3 includes a plurality of energy storage modules 30. The energy storage modules 30 are electrically connected directly to each other by bus bars (not shown). The energy storage modules 30 are disposed at intervals in the width direction L2. Furthermore, the energy storage modules 30 are disposed so as to be aligned in the front-rear direction L1. The energy storage modules 30 are disposed at intervals in the width direction L2, and the connecting walls 19 are disposed so as to pass between the energy storage modules 30. The energy storage module 30 includes a plurality of energy storage cells. The energy storage cell includes an electrode assembly and a cell case that houses the electrode assembly.

[0037] Fig. 2 is an exploded perspective view showing the configuration of the side wall 25, the electrical device 4, and their surroundings. Fig. 3 is a plan view showing the configuration of the side wall 25, the electrical device 4, and their surroundings. Note that Fig. 3 does not show the upper case 11.

[0038] The height of the connecting wall 19 is lower than the height of the partition walls 17 and 18 , so that a gap 24 is formed between the partition wall 18 and the connecting wall 19 on the upper surface of the connecting wall 19 .

[0039] The height of the connection wall 19 is lower than the height of the power storage modules 30 of the power storage unit 3. Therefore, on the upper surface of the connection wall 19, a passage 31 is formed that passes between the power storage modules 30.

[0040] The electric devices 4 are provided in the device area 21. The electric devices 4 include a device 35 and a device 36.

[0041] The devices 35 and 36 are arranged at an interval in the width direction L2, and are arranged so as to be in contact with the connecting wall 19. The device 35 is in contact with the partition wall 17, and the device 36 is in contact with the partition wall 18. Therefore, a space 14 is formed by the upper surface of the connecting wall 19, the devices 35, and the devices 36. The space 14 is in communication with the gap 24 and the passage 31. An open valve 5 is arranged above the space 14.

[0042] The device 35 is disposed adjacent to the connecting wall 19 on the long side wall 27 side, and is provided in the divided region 22. The device 35 is disposed at a distance from the long side wall 27. A gap space 37 is formed between the device 35 and the long side wall 27. The device 35 includes a case. A relay, a fuse, and the like are housed inside the case. The device 35 is electrically connected to the power storage unit 3.

[0043] The device 36 is disposed adjacent to the connecting wall 19 on the long side wall 28 side, and is provided in the divided region 23. The device 36 is disposed at a distance from the long side wall 28. A gap space 38 is formed between the device 36 and the long side wall 28. The device 36 includes a case. A relay, a fuse, and the like are housed inside the case. The device 36 is electrically connected to the power storage unit 3.

[0044] In addition, a gap space 39 in which no power storage unit 3 is provided is also formed in the battery region 20. On the other hand, the power storage unit 3 is arranged so as to fill up the battery region 20, and therefore the gap space 39 is small. Therefore, the total capacity of the gap space 37 and the gap space 38 is larger than the capacity of the gap space 39. Furthermore, the capacity of each of the gap space 37 and the gap space 38 is larger than the capacity of the gap space 39.

[0045] The energy storage device 1 includes a connection module 7. The connection module 7 is provided on the outer surface of the side wall 25. Specifically, the connection module 7 is provided on a portion of the outer surface of the side wall 25 that is positioned in the arrangement direction D1 with respect to the devices 35, 36 and the connecting wall 19.

[0046] The connection module 7 includes a plate 45, a connection portion 46, and a connection portion 47. Power line connectors are connected to the connection portions 46 and 47, respectively. The connectors are then electrically connected to the devices 35 and 36, respectively.

[0047] The breathable waterproof member 6 is provided in the second portion 34 of the casing 2 that defines the equipment area 21 .

[0048] In the example shown in this figure, the breathable waterproof member 6 is provided on the side wall 25 at a position adjacent to the front side in the arrangement direction D1 of the devices 35, 36 and the connecting wall 19. Specifically, the breathable waterproof member 6 is provided on the adjacent portion 29 of the side wall 25 adjacent to the device 36.

[0049] In the vertical direction L3, the breathable waterproof member 6 is disposed below the upper end of the side wall 25. In the example shown in this figure, it is disposed in the center of the side wall 25 in the vertical direction L3.

[0050] 4 is a cross-sectional view showing the breathable waterproof member 6, the side wall 25 and the surrounding area. The side wall 25 has a plurality of ventilation holes 50 formed therein.

[0051] The breathable waterproof member 6 includes a tubular portion 51, a thin plate 52, a breathable waterproof membrane 53, and a fixing member 54. The tubular portion 51 is formed hollow, and has a through-hole 55 formed therein. The thin plate 52 is provided inside the tubular portion 51, and has a plurality of ventilation holes 56 formed in the thin plate 52.

[0052] The breathable waterproof membrane 53 is provided so as to close the opening of the outer tubular portion 51, and the breathable waterproof membrane 53 is fixed by a fixing member 54. The breathable waterproof membrane 53 is formed of, for example, Gore-Tex (registered trademark) or the like.

[0053] For example, an increase in the temperature of the electricity storage unit 3 may cause the internal pressure of the housing case 2 to become higher than the atmospheric pressure outside the housing case 2. In this case, the air inside the housing case 2 is discharged to the outside of the housing case 2 through the breathable waterproof membrane 53. Furthermore, depending on the external environment, the internal pressure inside the housing case 2 may become lower than the atmospheric pressure outside the housing case 2. In this case, outside air enters the housing case 2 through the breathable waterproof membrane 53.

[0054] In this way, the breathable waterproof member 6 maintains the internal pressure within the storage case 2 within a certain range. On the other hand, the breathable waterproof membrane 53 does not allow liquids such as water to pass through, and therefore prevents rainwater and the like from entering the storage case 2.

[0055] 1, the release valve 5 is provided in the second portion 34 of the accommodation case 2, which defines the equipment area 21. In the example shown in Fig. 1, the release valve 5 is provided in the upper case 11. The release valve 5 is configured to open when the internal pressure in the accommodation case 2 reaches or exceeds a predetermined pressure.

[0056] In the energy storage device 1 configured as described above, an internal short circuit or the like may occur within the electrode body of the energy storage cell in the energy storage unit 3. When an internal short circuit or the like occurs within the electrode body, the energy storage cell may become hot, and exhaust gas may be emitted from the energy storage unit 3. This exhaust gas is hot, and often contains metal blast such as fragments of the electrode body.

[0057] The storage unit 3 is provided in the battery area 20, and partition walls 17, 18 are arranged between the battery area 20 and the equipment area 21, so that exhaust gas tends to remain in the battery area 20 and high-temperature gas is prevented from entering the equipment area 21.

[0058] Since the release valve 5 and the breathable waterproof member 6 are provided in the equipment area 21, the release valve 5 and the breathable waterproof member 6 can be prevented from being exposed to high-temperature gas.

[0059] The partition walls 17 and 18 are higher than the electricity storage unit 3 , so that exhaust gas generated from the electricity storage unit 3 is prevented from flowing into the equipment area 21 .

[0060] Furthermore, since the partition walls 17 and 18 are in contact with the upper case 11, high-temperature gas is prevented from entering the equipment area 21. This prevents the breathable waterproof member 6 from being exposed to high-temperature gas.

[0061] Furthermore, since the breathable waterproof member 6 is located further forward in the arrangement direction D1 than the open valve 5, the breathable waterproof member 6 is prevented from being exposed to high-temperature gas.

[0062] The breathable waterproof member 6 is provided on the side wall 25. Therefore, compared to when the breathable waterproof member 6 is provided on the upper case 11, it is possible to prevent foreign matter such as rainwater from accumulating on the upper surface of the breathable waterproof member 6. This ensures the breathability of the breathable waterproof member 6.

[0063] When a large amount of high-temperature gas is discharged from the connection module 7, the internal pressure inside the housing case 2 rises. When the internal pressure inside the housing case 2 exceeds a predetermined pressure, the release valve 5 opens. When the internal pressure inside the housing case 2 increases, the upper case 11 deforms and bulges upward. As a result, gaps are formed between the upper case 11 and the partition walls 17 and 18.

[0064] Then, the high-temperature gas passes through this gap and reaches the open valve 5, from which the high-temperature gas is exhausted.

[0065] 2 and 3, a passage 31, a gap 24, and a space 14 are formed on the upper surface of the connecting wall 19, and an open valve 5 is disposed above the space 14. Exhaust gas passes through the passage 31, the gap 24, and the space 14 in this order, and is exhausted from the open valve 5.

[0066] The breathable waterproof member 6 is provided forward of the open valve 5 in the arrangement direction D1, so that the exhaust gas is prevented from coming into contact with the breathable waterproof member 6 when the exhaust gas is discharged from the open valve 5.

[0067] 4 , the breathable waterproof member 6 is provided in the center of the side wall 25 in the up-down direction L3, and the open valve 5 is provided in the upper case 11, so the breathable waterproof member 6 is located below the open valve 5. Therefore, when the exhaust gas is discharged through the open valve 5, the exhaust gas flows upward, and the exhaust gas is prevented from reaching the breathable waterproof member 6.

[0068] 2 and 3 , the breathable waterproof member 6 is provided in the adjacent portion 29 of the side wall 25. Therefore, even if the exhaust gas enters the equipment area 21, the equipment 36 prevents the exhaust gas from reaching the breathable waterproof member 6. In particular, it is possible to prevent metal blast contained in the exhaust gas from coming into contact with the breathable waterproof member 6.

[0069] Furthermore, the height of the equipment 36 is higher than the connecting wall 19, and the equipment 36 is positioned so as to be in contact with the partition wall 18, thereby preventing metal blast from the exhaust gas from entering the dividing region 23.

[0070] As described above, there are cases where the amount of exhaust gas generated from the electricity storage unit 3 decreases over time as the open valve 5 discharges the exhaust gas. In such a case, the internal pressure in the housing case 2 decreases, and when the internal pressure in the housing case 2 falls below a predetermined pressure, the open valve 5 closes.

[0071] As the internal pressure in the storage case 2 decreases, the amount of deformation of the upper case 11 that has been deformed so as to bulge upward decreases, and the upper case 11 comes into contact with the partition walls 17 and 18.

[0072] At this time, the temperature of the power storage cell where an internal short circuit or the like has occurred may be high, and exhaust gases are present in the battery area 20 .

[0073] In this state, over time, depending on the internal pressure within the storage case 2 and the external air pressure around the storage case 2, air outside the storage case 2 may enter the storage case 2 through the breathable waterproof member 6.

[0074] The breathable waterproof member 6 is provided in the equipment region 21, and partition walls 17, 18 are provided between the battery region 20 and the equipment region 21. This prevents air (inflowing air) flowing in from the breathable waterproof member 6 from entering the battery region 20. This prevents the inflowing air from entering the battery region 20 and reaching the high-temperature storage cells.

[0075] The height of the partition walls 17, 18 is greater than the height of the power storage unit 3, so that the partition walls 17, 18 can come into contact with the upper case 11 before the incoming air enters the accommodation case 2. This prevents the incoming air from entering the battery region 20.

[0076] 2 and 3, the air that flows in from the breathable waterproof member 6 enters the divided region 23. The volume of the gap space 38 in the divided region 23 is larger than the volume of the gap space 39.

[0077] Therefore, the inflowing air is diffused within the dividing region 23 and is prevented from entering the battery region 20 .

[0078] The breathable waterproof member 6 is provided in an adjacent portion 29 of the side wall 25 that is adjacent to the equipment 36. Therefore, when the inflowing air enters the divided region 23, the inflowing air hits the equipment 36, thereby reducing the inflow speed of the inflowing air into the gap space 38.

[0079] Second Embodiment A power storage device 1A according to a second embodiment will be described with reference to Fig. 5 etc. The configuration of the power storage device 1A is substantially the same as the configuration of the power storage device 1, except for the mounting position of the breathable waterproof member 6A.

[0080] 5 is an exploded perspective view showing the configuration of the side wall 25, the electrical device 4, and the surrounding area in the energy storage device 1A. The side wall 25 includes an adjacent portion 42 that is adjacent to the connecting wall 19 on the front side in the arrangement direction D1. The breathable waterproof member 6A is provided in the adjacent portion 42.

[0081] 6 is a cross-sectional view showing the breathable waterproof member 6A and other components. The tubular portion 51 of the breathable waterproof member 6A communicates with the hollow portion 12 of the connecting wall 19. The connecting wall 19 includes a blocking wall 61 provided within the adjacent portion 29. A through-hole 62 is formed in the connecting wall 19. The through-hole 62 is formed on the upper surface of the connecting wall 19, between the end of the connecting wall 19 and the blocking wall 61. In the front-rear direction L1, the through-hole 62 is provided further forward in the arrangement direction D1 than the open valve 5. A mesh-like net member 60 is provided at the opening of the through-hole 62.

[0082] When the internal pressure of the storage case 2 decreases, the gas inside the storage case 2 passes through the through-holes 62 and the hollow portion 12 and reaches the breathable waterproof member 6A. Then, the gas is discharged from the breathable waterproof member 6A to the outside of the storage case 2.

[0083] In the power storage device 1A configured as described above, when exhaust gas is discharged from the power storage unit 3 , the exhaust gas accumulates in the battery area 20 .

[0084] At this time, exhaust gas remaining in the battery region 20 may enter the hollow portion 12 of the connecting wall 19. On the other hand, since the blocking wall 61 is provided in the connecting wall 19, even if exhaust gas enters the hollow portion 12 in the battery region 20, the exhaust gas is prevented from reaching the breathable waterproof member 6A, thereby preventing damage to the breathable waterproof member 6A.

[0085] In the above-described energy storage device 1A, when the amount of exhaust gas discharged from the energy storage unit 3 increases and the internal pressure in the accommodating case 2 exceeds a predetermined pressure, the release valve 5 opens and the exhaust gas is discharged from the release valve 5.

[0086] The through-holes 62 are provided forward in the arrangement direction D1 relative to the open valves 5. Therefore, when the exhaust gas is discharged from the open valves 5, the exhaust gas can be prevented from reaching the through-holes 62.

[0087] A mesh member 60 is provided in the through-hole 62. Therefore, even if the exhaust gas reaches the space 14, the metal blast is prevented from passing through the through-hole 62.

[0088] The breathable waterproof member 6 is provided at a position farther in the arrangement direction D1 than the through-holes 62. Therefore, even if metal blast gets into the hollow portion 12 of the connecting wall 19, the metal blast can be prevented from reaching the breathable waterproof member 6.

[0089] (Embodiment 3) The configuration of a power storage device 1B according to embodiment 3 will be described with reference to Fig. 7 and other figures. Fig. 7 is an exploded perspective view showing the power storage device 1B. The configuration of the power storage device 1B is substantially the same as the configuration of the power storage device 1, except for the partition wall 65 and the connecting wall 19B.

[0090] The partition wall 65 is formed to connect the long side wall 27 and the long side wall 28. The connecting wall 19B is connected to the partition wall 65. The height of the partition wall 65 is greater than the height of the power storage module 30 of the power storage unit 3. The partition wall 65 is in contact with the upper case 11.

[0091] In the third embodiment, the space inside the accommodating case 2 is also divided into a battery area 20 and an equipment area 21 by a partition wall 65 .

[0092] The devices 35 and 36 , the release valve 5 and the breathable waterproof member 6 are provided in the device region 21 .

[0093] In the electricity storage device 1B configured as described above, exhaust gas may be discharged from the electricity storage unit 3.

[0094] The partition wall 65 is formed from the long side wall 27 to the long side wall 28, and is in contact with the upper case 11. This makes it possible to prevent exhaust gas from entering the equipment area 21.

[0095] Fourth Embodiment The configuration of a power storage device 1C according to a fourth embodiment will be described with reference to Fig. 8 etc. The configuration of the power storage device 1C is substantially the same as the configuration of the power storage device 1 except for the mesh member 66.

[0096] FIG. 8 is an exploded perspective view showing the side wall 25, the electrical device 4, and the surrounding configuration of the power storage device 1C.

[0097] Mesh member 66 is provided on the upper surface of connecting wall 19, and is provided to connect partition wall 17 and partition wall 18. According to this energy storage device 1C, it is possible to prevent metal blast from entering equipment area 21 when exhaust gas is discharged from energy storage unit 3. Note that the configuration of mesh member 66 may be applied to energy storage device 1 according to embodiment 1 and energy storage device 1A according to embodiment 2.

[0098] Fifth Embodiment A power storage device 1D according to a fifth embodiment will be described with reference to Fig. 9 and other figures. Fig. 9 is an exploded perspective view showing the power storage device 1D. The power storage device 1D includes a breathable waterproof member 6D.

[0099] The breathable waterproof member 6D is provided at a position away from a portion of the side wall 25 that is located forward in the arrangement direction D1 with respect to the electrical device 4. The breathable waterproof member 6D is provided forward in the arrangement direction D1 with respect to the dividing region 23.

[0100] In the above-described electricity storage device 1D, when the internal pressure in the electricity storage device 1D rises once and then falls, air flows into the electricity storage device 1D through the breathable waterproof member 6D.

[0101] In this case, the breathable waterproof member 6D communicates with the dividing region 23, and the air that flows in from the breathable waterproof member 6D can be retained within the dividing region 23. This prevents the air that flows in from the breathable waterproof member 6D from reaching the battery region 20. The breathable waterproof member 6D may be mounted, for example, on a portion of the long side walls 27, 28 that is located forward of the partition walls 17, 18.

[0102] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present disclosure is defined by the scope of the claims, and it is intended to include all modifications within the meaning and scope of the claims.

[0103] REFERENCE SIGNS LIST 1, 1A, 1B, 1C Energy storage device, 2 Storage case, 3 Energy storage unit, 4 Electrical equipment, 5 Release valve, 6, 6A Breathable waterproof member, 7 Connection module, 10 Lower case, 11 Upper case, 12 Hollow portion, 14 Space, 15 Bottom plate, 16, 16 16 Peripheral wall, 17, 18, 65 Partition wall, 19, 19B Connection wall, 20 Battery area, 21 Equipment area, 22, 23 Dividing area, 24 Gap, 25, 26 Side wall, 27, 28 Long side wall, 29, 42 Adjacent portion, 30 Energy storage module, 31 Passage, 33 First portion, 34 Second portion, 35, 36 Equipment, 37, 38, 39 Gap space, 45 Plate, 46, 47 Connection portion, 50, 56 Ventilation hole, 51 Cylinder portion, 52 Thin plate, 53 breathable waterproof membrane, 54 fixing member, 55, 62 through-hole, 60, 66 mesh member, 61 blocking wall, D1 arrangement direction, L1 front-rear direction, L2 width direction, L3 up-down direction.

Claims

1. An electricity storage device comprising: a storage case; an electricity storage unit provided within the storage case; a partition wall provided within the storage case that divides the interior of the storage case into a first area and a second area; an open valve provided on the storage case; and a breathable waterproof member provided on the storage case, wherein the electricity storage unit is provided in the first area on the outer surface of the storage case, and the open valve and the breathable waterproof member are provided on a portion of the outer surface of the storage case that defines the second area.

2. The energy storage device according to claim 1, wherein, when the direction from the first region toward the second region is defined as an arrangement direction, the breathable waterproof member is positioned forward of the open valve in the arrangement direction.

3. The electricity storage device according to claim 2, wherein the storage case includes a side wall located forward of the partition wall in the arrangement direction, and the breathable waterproof member is provided on the side wall.

4. The energy storage device according to claim 3, further comprising an electrical device provided in the second region, wherein the breathable waterproof member is provided in an adjacent portion of the side wall adjacent to the electrical device in the arrangement direction.

5. The energy storage device according to claim 4, wherein a second gap space in the second region where no electrical device is provided is larger than a first gap space in the first region where no energy storage unit is provided.

6. The energy storage device according to claim 3, further comprising an electrical device provided in the second region, wherein the breathable waterproof member is provided in a portion spaced apart from an adjacent portion adjacent to the electrical device forward in the arrangement direction.

7. The electricity storage device according to claim 3, wherein the height of the partition wall is greater than the height of the electricity storage unit.

8. An electricity storage device according to any one of claims 1 to 7, wherein the storage case includes a lower case in which the partition wall is provided and an upper case arranged above the lower case, and the release valve is provided in the upper case.

9. The energy storage device according to claim 1, wherein the direction from the first region toward the second region is defined as an arrangement direction, and the direction intersecting the arrangement direction is defined as a width direction, the energy storage unit includes a first energy storage module and a second energy storage module arranged at a distance in the width direction, the storage case includes a side wall positioned in the arrangement direction relative to the second region, and the connecting wall extending in the arrangement direction, passing between the first energy storage module and the second energy storage module, and connected to the side wall, a hollow space being formed inside the connecting wall, and the breathable waterproof member is provided on the side wall and is provided so as to communicate with the hollow space.

10. The electricity storage device according to claim 9, wherein a through-hole is formed in the connection wall at a portion located forward of the open valve in the arrangement direction.

Images