Electricity storage device

Abstract

The electrical storage device provided by the utility model is provided with a plurality of electrical storage cells and an accommodating shell. Each of the plurality of power storage cells includes a cell smoke discharge valve that is provided on a side surface of the power storage cell and discharges gas within the power storage cell. The containing shell comprises a lower shell body, an upper shell body and a shell body smoke exhaust valve. The housing exhaust valve is provided above or below the center of the accommodating housing in the vertical direction. When the case smoke vent valve is provided above the center of the housing case, the cell smoke vent valve is provided above the center of the storage cell in the vertical direction. When the case smoke vent valve is provided below the center of the housing case, the cell smoke vent valve is provided below the center of the storage cell in the vertical direction.

Description

Technical Field

[0001] The present disclosure relates to a power storage device. Background Art

[0002] Japanese Patent Application Laid-Open No. 2023-17448 discloses a battery pack having terminals and a smoke exhaust valve on top of battery cells for exhausting gas within the battery cells, and exhausting the gas exhausted from the smoke exhaust valve through an exhaust duct provided on the top of the battery pack.

[0003] Furthermore, some battery packs contain cells with smoke exhaust valves installed on the sides of the cells. In such cases, if the exhaust duct is located above the battery pack, the smoke exhaust valve and duct are located far apart, potentially reducing smoke exhaust efficiency. The smoke exhaust efficiency of power storage devices containing cells with smoke exhaust valves installed on the sides of the cells needs to be improved. Utility Model Content

[0004] One object of the present disclosure is to improve smoke exhaust efficiency in an electric storage device that houses electric storage cells each having a cell smoke exhaust valve provided on a side surface of the electric storage cell.

[0005] An aspect of the present disclosure relates to an electric storage device comprising a plurality of electric storage cells and a housing for housing the plurality of electric storage cells. The plurality of electric storage cells respectively include a cell exhaust valve which is provided on a side of the electric storage cell and which exhausts the gas inside the electric storage cell. The housing includes a lower housing, an upper housing, and a housing exhaust valve which exhausts the gas inside the housing. The housing exhaust valve is provided at a position above or below the center of the housing in the vertical direction. When the housing exhaust valve is provided at a position above the center of the housing, the cell exhaust valve is provided at a position above the center of the electric storage cell in the vertical direction. When the housing exhaust valve is provided at a position below the center of the housing, the cell exhaust valve is provided at a position below the center of the electric storage cell in the vertical direction.

[0006] Preferably, the case smoke exhaust valve is provided above the center of the lower case, or the case smoke exhaust valve is provided on the upper case and the cell smoke exhaust valve is provided above the center of the storage cell in the vertical direction.

[0007] Preferably, the case smoke exhaust valve is provided below the center of the lower case, and the cell smoke exhaust valve is provided below the center of the storage cell in the vertical direction.

[0008] Preferably, the power storage device is mounted on a vehicle. Each of the plurality of power storage cells includes an upper surface, a lower surface, a pair of short side surfaces, and a pair of long side surfaces. The pair of long side surfaces are spaced apart in the width direction of the vehicle. The pair of long side surfaces are each formed to extend in the front-to-rear direction of the vehicle. The pair of short side surfaces are spaced apart in the front-to-rear direction of the vehicle. The cell smoke exhaust valve is provided on one of the pair of short side surfaces.

[0009] Preferably, the power storage device is mounted on a vehicle. Each of the plurality of power storage cells includes an upper surface, a lower surface, a pair of short side surfaces, and a pair of long side surfaces. The pair of long side surfaces are spaced apart in the front-to-rear direction of the vehicle. The pair of long side surfaces are each formed to extend in the width direction of the vehicle. The pair of short side surfaces are spaced apart in the width direction of the vehicle. The cell smoke exhaust valve is provided on one of the pair of short side surfaces.

[0010] Preferably, the lower surface is fixed to the lower shell by an adhesive material.

[0011] According to the present disclosure, in an electric storage device that houses an electric storage cell having a cell smoke exhaust valve provided on a side surface of the electric storage cell, smoke exhaust efficiency is improved.

[0012] Features, advantages, and technical and industrial significance of exemplary embodiments of the present invention are described below with reference to the accompanying drawings, in which like reference numerals represent like elements. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a perspective view schematically showing the power storage device according to the first embodiment.

[0014] Figure 2 It is a diagram schematically showing an example of the storage cell 10 .

[0015] Figure 3 This diagram schematically shows a cross section of the electricity storage device 1 when the electricity storage device 1 is cut along a plane passing through the case smoke exhaust valve 23 and parallel to the short side surface 13 of the electricity storage cell 10 .

[0016] Figure 4 It is a perspective view schematically showing a power storage device according to the second embodiment.

[0017] Figure 5 It is a perspective view schematically showing a power storage device according to the third embodiment.

[0018] Figure 6 It is a diagram schematically showing an example of the power storage cell 10B.

[0019] Figure 7 It is a perspective view schematically showing a power storage device according to a fourth embodiment.

[0020] Figure 8 It is a cross-sectional view schematically showing the power storage device according to the fourth embodiment. DETAILED DESCRIPTION

[0021] Below, embodiments and modifications according to the present disclosure are described with reference to the accompanying drawings. In the following description, identical components and structural elements are denoted by the same reference numerals. Their names and functions are also identical. Therefore, detailed descriptions thereof will not be repeated. In addition, the embodiments and modifications described below may be selectively combined as appropriate.

[0022] [Implementation Method 1]

[0023] Reference Figures 1 to 3 , the power storage device according to the first embodiment will be described. Figure 1 A perspective view schematically showing the power storage device according to the first embodiment.

[0024] Reference Figure 1 The power storage device 1 according to Embodiment 1 is used, for example, by being mounted on a vehicle. Examples of vehicles include hybrid vehicles, plug-in hybrid vehicles, fuel cell vehicles, and electric vehicles. The power storage device 1 includes a plurality of power storage cells 10 and a housing case 20 for housing the plurality of power storage cells 10.

[0025] The storage cell 10 is a secondary battery, typically a lithium-ion secondary battery. A lithium-ion secondary battery uses lithium as a charge carrier. In addition to conventional lithium-ion secondary batteries with liquid electrolytes, they also include so-called all-solid-state batteries that use solid electrolytes. Furthermore, the storage cell 10 is not limited to lithium-ion secondary batteries and may also be a nickel-metal hydride secondary battery or other secondary battery.

[0026] The storage cells 10 are arranged so as to extend in the front-rear direction D1 of the vehicle. The plurality of storage cells 10 are arranged along the width direction D2 of the vehicle.

[0027] The housing 20 includes an upper housing 21, a lower housing 22, and a housing smoke exhaust valve 23. The lower housing 22 includes a bottom plate, a peripheral wall, and a plurality of partition walls 60, 61, 62, 63, and 64. The plurality of partition walls 60, 61, 62, 63, and 64 divide the space within the housing 20 into a plurality of parts.

[0028] The bottom plate is formed in a flat plate shape. The peripheral wall is formed to extend upward from the outer peripheral portion of the bottom plate, and the peripheral wall is formed in a ring shape. Partition walls 60, 61, 62, 63, and 64 are provided on the bottom plate. The partition walls 60, 61, 62, and 63 are formed to extend in the front-rear direction D1 of the vehicle, and the partition wall 64 is formed to extend in the width direction D2 of the vehicle. The partition wall 64 is arranged in the center of the front-rear direction D1 of the vehicle. The partition wall 60 and the partition wall 63 are arranged in the center of the width direction D2 of the vehicle. The partition wall 60 is arranged in a position closer to the front side than the partition wall 64, and the partition wall 63 is arranged in a position closer to the rear side than the partition wall 64. A plurality of storage cells 10 are accommodated in a space formed by assembling the upper shell 21 to the lower shell 22. In Figure 1 ] shows the power storage device 1 in a state where the upper case 21 is removed.

[0029] The casing smoke exhaust valve 23 is configured to exhaust the gas in the accommodating casing 20 . The casing smoke exhaust valve 23 is provided on the upper casing 21 .

[0030] Figure 2 Schematic diagram of an example of the storage cell 10. Figure 2 The battery cell 10 includes an upper surface 11, a lower surface 12, a pair of short sides 13, 14, and a pair of long sides 15, 16. The pair of short sides 13, 14 are spaced apart in the vehicle's front-to-rear direction D1. The pair of long sides 15, 16 are spaced apart in the vehicle's width direction D2. The pair of long sides 15, 16 are each formed to extend in the vehicle's front-to-rear direction D1. In addition, the short sides 13, 14 and the long sides 15, 16 are "sides" in this disclosure.

[0031] The storage cell 10 further includes a positive terminal 17 and a negative terminal 18. The positive terminal 17 is provided on one of the pair of short side surfaces 13 and 14, and the negative terminal 18 is provided on the other of the pair of short side surfaces 13 and 14. Figure 2 In the example shown, positive terminal 17 is provided on short side surface 14, and negative terminal 18 is provided on short side surface 13. Alternatively, either positive terminal 17 or negative terminal 18 may be provided on one of the pair of short side surfaces 13, 14.

[0032] The battery cell 10 also includes a battery cell exhaust valve 19 for exhausting the gas inside the battery cell 10. The battery cell exhaust valve 19 is configured to discharge the gas inside the battery cell 10 to the outside of the battery cell 10 when the internal pressure of the battery cell 10 rises. The gas exhausted from the battery cell exhaust valve 19 is high temperature. The battery cell exhaust valve 19 is provided on the side of the battery cell 10. More specifically, the battery cell exhaust valve 19 is provided on one of a pair of short side surfaces 13 and 14. Figure 2In the example shown, the cell smoke exhaust valve 19 is provided on the short side surface 13 provided with the negative terminal 18. The double-dashed line 71 indicates the power storage device 1 (see Figure 1 ) in the center of the storage cell 10 in the vertical direction D3 of the power storage device 1. The cell smoke exhaust valve 19 is provided above the center of the storage cell 10 in the vertical direction D3 of the power storage device 1.

[0033] Figure 3 1 is a diagram schematically showing a cross section of the power storage device 1 when the power storage device 1 is cut with a plane passing through the housing exhaust valve 23 and parallel to the short side surface 13 of the power storage cell 10. Figure 3 In the drawings, hatching indicating the cross section of the storage cell 10 is omitted for clarity of the drawings.

[0034] Reference Figure 3 , the two-dot chain line 72 indicates the center position of the housing case 20 in the vertical direction D3 of the power storage device 1. Figure 3 As shown, the case smoke exhaust valve 23 is provided above the center of the housing case 20 in the up-down direction D3 of the electrical storage device 1 .

[0035] The lower surface 12 of the storage cell 10 is fixed to the lower shell 22 by an adhesive material 30. The storage device 1 further includes a cooler 40 for cooling the storage cell 10. The cooler 40 is provided above the storage cell 10. More specifically, the cooler 40 is provided along the upper surface 11 in the space between the upper surface 11 of the storage cell 10 and the upper shell 21. Thus, the cooler 40 is located near the cell exhaust valve 19 (see FIG. Figure 2 ) is nearby.

[0036] A space 50 where cooler 40 is not provided is provided between upper surface 11 of storage cell 10 and upper case 21 . Space 50 includes at least a portion of a region facing case smoke exhaust valve 23 . Space 50 is formed above partition wall 60 .

[0037] Therefore, in the power storage device 1, the cell smoke exhaust valve 19 (see Figure 2 ), the cooler 40, the space 50 and the case exhaust valve 23 are provided above the center of the housing case 20 in the vertical direction D3 of the power storage device 1. Figure 2 ) The exhaust gas flows along the short side 13 (refer to Figure 2) moves inside the containment shell 20 and reaches the vicinity of the cooler 40. If the gas fills the containment shell 20, the internal pressure inside the containment shell 20 rises. As a result, the upper shell 21 is deformed in a manner that expands upward. On the other hand, the lower shell 22 is fixed to each battery cell 10 by the adhesive material 30, thereby suppressing the deformation of the lower shell 22. Moreover, by deforming the upper shell 21 in a manner that expands upward, a gap is formed between the upper shell 21 and the cooler 40, and the gas is retained in the gap.

[0038] Thereafter, when the internal pressure within the housing case 20 exceeds a predetermined pressure, the housing exhaust valve 23 opens, exhausting the gas within the housing case 20 to the outside. At this time, since the housing exhaust valve 23 is located within the upper housing 21, and the gas is trapped between the upper housing 21 and the cooler 40, the gas efficiently passes through the housing exhaust valve 23 and is exhausted to the outside. Specifically, the gas exhausted from the cell exhaust valve 19 moves through the aforementioned gap to the space 50, passes through the space 50, and is exhausted from the housing case 20 through the housing exhaust valve 23. Therefore, according to the power storage device 1, the exhaust efficiency of the gas exhausted from the cell exhaust valve 19 to the outside of the housing case 20 through the housing exhaust valve 23 is improved.

[0039] Here, the gas exhausted from the cell smoke exhaust valve 19 is high temperature, and as mentioned above, it accumulates in the upper portion of the housing 20. Meanwhile, the cooler 40 is positioned on the upper surface 11 of each storage cell 10, thereby preventing degradation of the upper surface 11 of each storage cell 10 and other components due to heat from the high-temperature gas. Furthermore, the partition wall 60 is located below the space 50, preventing the storage cells 10 from being exposed to the high-temperature gas when the gas circulates in the space 50.

[0040] Furthermore, in the power storage device 1, the cooler 40 is located near the cell exhaust valve 19. Therefore, in the power storage device 1, the gas exhausted from the cell exhaust valve 19 is cooled relatively quickly. Furthermore, in the power storage device 1, the cooler 40 is located in the path of the gas exhausted from the cell exhaust valve 19. Therefore, the gas exhausted from the cell exhaust valve 19 is gradually cooled as it travels to the case exhaust valve 23. Consequently, in the power storage device 1, damage to the power storage cells 10 and upper case 21 caused by the high-temperature gas exhausted from the cell exhaust valve 19 is suppressed.

[0041] Thus, in the electricity storage device 1 according to the first embodiment, the case exhaust valve 23 is located above the center of the storage case 20 in the vertical direction D3 of the electricity storage device 1, and the cell exhaust valve 19 is located above the center of the storage cell 10 in the vertical direction D3 of the electricity storage device 1. This configuration shortens the exhaust path that the gas exhausted from the cell exhaust valve 19 takes before being discharged from the case exhaust valve 23 to the outside of the storage case 20, compared to a case where the cell exhaust valve 19 is located below the center of the storage cell 10 in the vertical direction D3 of the electricity storage device 1. Therefore, according to the electricity storage device 1 according to the first embodiment, when the cell exhaust valve 19 is located on the side of the storage cell 10, the exhaust efficiency of the gas exhausted from the cell exhaust valve 19 to the outside of the storage case 20 through the case exhaust valve 23 is improved. Furthermore, according to the power storage device 1 according to the first embodiment, the exhaust path can be shortened, and therefore the area where the high-temperature gas exhausted from the cell exhaust valve 19 contacts the power storage cells 10 can be reduced.

[0042] In addition, in the storage device 1 according to the first embodiment, the cell exhaust valve 19 is provided on one of the pair of short side surfaces 13 and 14 of the storage cell 10 (for example, the short side surface 13). According to such a structure, the gas exhausted from the cell exhaust valve 19 rises within the storage case 20 along the short side surface 13. If the cell exhaust valve 19 is provided on one of the pair of long side surfaces 15 and 16 of the storage cell 10, the gas exhausted from the cell exhaust valve 19 rises within the storage case 20 along the long side surface 15 or the long side surface 16. Therefore, when the cell exhaust valve 19 is provided on one of the pair of long side surfaces 15 and 16 of the storage cell 10, the area in which the high-temperature gas exhausted from the cell exhaust valve 19 contacts the storage cell 10 becomes larger. However, in the storage device 1 according to the first embodiment, the cell exhaust valve 19 is provided on one of the pair of short side surfaces 13 and 14 of the storage cell 10. Therefore, according to the power storage device 1 involved in embodiment 1, compared with the case where the cell fume exhaust valve 19 is provided on one of the pair of long side surfaces 15 and 16 of the power storage cell 10, the area where the high-temperature gas exhausted from the cell fume exhaust valve 19 contacts the power storage cell 10 can be reduced.

[0043] Furthermore, in the electricity storage device 1 according to the first embodiment, the lower surface 12 of the electricity storage cell 10 is fixed to the lower case 22 by the adhesive material 30. In the electricity storage device 1 according to the first embodiment, due to the above-described structure, the gas exhausted from the cell fume exhaust valve 19 rises along the short side surface 13 within the housing case 20, passes through the space 50, and is exhausted from the housing case 20 through the case fume exhaust valve 23. Therefore, according to the electricity storage device 1 according to the first embodiment, it is possible to prevent the high-temperature gas exhausted from the cell fume exhaust valve 19 from coming into contact with the adhesive material 30.

[0044] [Implementation Method 2]

[0045] Reference Figure 4 , the power storage device according to the second embodiment will be described. Figure 4 It is a perspective view schematically showing a power storage device according to the second embodiment.

[0046] Reference Figure 4 The power storage device 1A according to the second embodiment is different from the power storage device 1 according to the first embodiment (see Figure 1 ) is different in the position of the housing smoke exhaust valve 23. In the power storage device 1A according to the second embodiment, the housing smoke exhaust valve 23 is provided in the lower housing 22. In other respects, the power storage device 1A according to the second embodiment is different from the power storage device 1 according to the first embodiment (see Figure 1 ) are the same, so they are not repeated.

[0047] exist Figure 4 1A is shown in the state where the upper shell 21 is removed. The double-dashed line 73 indicates the position of the center of the housing 20 in the vertical direction D3 of the storage device 1A. In the storage device 1A, the housing exhaust valve 23 is provided at a position above the center of the housing 20 in the vertical direction D3 of the storage device 1A. That is, in the storage device 1A, the housing exhaust valve 23 is provided at a position above the center of the lower shell 22 in the vertical direction D3 of the storage device 1A. From the cell exhaust valve 19 (refer to Figure 2 ) The exhaust gas flows along the short side 13 (refer to Figure 2 ) and move from the shell exhaust valve 23 (refer to Figure 4 ) is discharged outside the accommodating shell 20.

[0048] Thus, in the power storage device 1A according to the second embodiment, the case exhaust valve 23 is located above the center of the storage case 20 in the vertical direction D3 of the power storage device 1A, and the cell exhaust valve 19 is located above the center of the storage cell 10 in the vertical direction D3 of the power storage device 1A. This configuration shortens the exhaust path that the gas exhausted from the cell exhaust valve 19 takes before being discharged from the case exhaust valve 23 to the outside of the storage case 20, compared to a case where the cell exhaust valve 19 is located below the center of the storage cell 10 in the vertical direction D3 of the power storage device 1A. Therefore, in the power storage device 1A according to the second embodiment, when the cell exhaust valve 19 is located on the side of the storage cell 10, the exhaust efficiency of the gas exhausted from the cell exhaust valve 19 to the outside of the storage case 20 through the case exhaust valve 23 is improved. Furthermore, according to the power storage device 1A according to the second embodiment, the exhaust path can be shortened, and therefore the area where the high-temperature gas exhausted from the cell exhaust valve 19 contacts the power storage cells 10 can be reduced.

[0049] Furthermore, in the power storage device 1A according to the second embodiment, the cell exhaust valve 19 is provided on one of the pair of short side surfaces 13 and 14 of the power storage cell 10 (for example, the short side surface 13). According to such a structure, the gas exhausted from the cell exhaust valve 19 moves along the short side surface 13 and is discharged from the housing case 20 through the housing exhaust valve 23. If the cell exhaust valve 19 is provided on one of the pair of long side surfaces 15 and 16 of the power storage cell 10, the gas exhausted from the cell exhaust valve 19 moves within the housing case 20 along the long side surface 15 or the long side surface 16. Therefore, when the cell exhaust valve 19 is provided on one of the pair of long side surfaces 15 and 16 of the power storage cell 10, the area over which the high-temperature gas exhausted from the cell exhaust valve 19 contacts the power storage cell 10 becomes larger. However, in the power storage device 1A according to the second embodiment, the cell fume exhaust valve 19 is provided on one of the pair of short side surfaces 13 and 14 of the power storage cell 10. Therefore, according to the power storage device 1A according to the second embodiment, compared with a case where the cell fume exhaust valve 19 is provided on one of the pair of long side surfaces 15 and 16 of the power storage cell 10, the area over which the high-temperature gas exhausted from the cell fume exhaust valve 19 contacts the power storage cell 10 can be reduced.

[0050] Furthermore, in the power storage device 1A according to the second embodiment, the lower surface 12 of the power storage cell 10 is fixed to the lower case 22 by an adhesive material 30. In the power storage device 1A according to the second embodiment, due to the above-described structure, the gas exhausted from the cell fume exhaust valve 19 moves along the short side surface 13 and is exhausted from the case fume exhaust valve 23 to the outside of the accommodating case 20. Therefore, according to the power storage device 1A according to the second embodiment, it is possible to prevent the high-temperature gas exhausted from the cell fume exhaust valve 19 from coming into contact with the adhesive material 30.

[0051] [Implementation Method 3]

[0052] Reference Figure 5 and Figure 6 , a power storage device according to Embodiment 3 will be described. Figure 5 It is a perspective view schematically showing a power storage device according to the third embodiment.

[0053] Reference Figure 5 The power storage device 1B according to the third embodiment differs from the power storage device 1 according to the first embodiment in two respects (see Figure 1 ) is different. The first point is that the power storage device 1B according to the third embodiment replaces the plurality of power storage cells 10 (see Figure 1) is provided with a plurality of storage cells 10B. The second point is the position of the housing exhaust valve 23. In the storage device 1B according to the third embodiment, the housing exhaust valve 23 is provided on the lower housing 22. In terms of the storage device 1B according to the third embodiment, the storage device 1B according to the third embodiment is different from the storage device 1 according to the first embodiment (see Figure 1 ) are the same, so they are not repeated.

[0054] exist Figure 5 2 shows the power storage device 1B with the upper case 21 removed. A plurality of storage cells 10B are housed in the housing case 20. The storage cells 10B are arranged so as to extend in the front-rear direction D1 of the vehicle. Furthermore, the plurality of storage cells 10B are arranged along the width direction D2 of the vehicle.

[0055] Two-dot chain line 74 indicates the center position of lower case 22 in vertical direction D3 of power storage device 1B. In power storage device 1B, case smoke exhaust valve 23 is provided below the center of lower case 22 in vertical direction D3 of power storage device 1B. That is, in power storage device 1B, case smoke exhaust valve 23 is provided below the center of housing case 20 in vertical direction D3 of power storage device 1B.

[0056] Figure 6 10B is a diagram schematically showing an example of a storage cell 10B. The storage cell 10B is different from the above-mentioned storage cell 10 (see Figure 2 ) is different in the position of the cell exhaust valve 19 and the negative terminal 18. In other respects, the storage cell 10B is the same as the above-mentioned storage cell 10 (see Figure 2 ) are the same, so they are not repeated.

[0057] The cell smoke exhaust valve 19 is provided on the side surface of the storage cell 10B. More specifically, the cell smoke exhaust valve 19 is provided on one of the pair of short side surfaces 13 and 14. Figure 6 In the example shown, the cell smoke exhaust valve 19 is provided on the short side surface 13 provided with the negative terminal 18. The double-dashed line 75 indicates the power storage device 1B ( Figure 5 The cell fume exhaust valve 19 is located at the center of the storage cell 10B in the vertical direction D3 of the power storage device 1B. The negative electrode terminal 18 is located within the short side surface 13 so as not to overlap with the cell fume exhaust valve 19.

[0058] In addition, either the positive electrode terminal 17 or the negative electrode terminal 18 may be provided on one of the pair of short side surfaces 13 and 14 .

[0059] Thus, in the power storage device 1B according to the third embodiment, the case exhaust valve 23 is located below the center of the storage case 20 in the vertical direction D3 of the power storage device 1B, and the cell exhaust valve 19 is located below the center of the storage cell 10B in the vertical direction D3 of the power storage device 1B. This configuration shortens the exhaust path that the gas exhausted from the cell exhaust valve 19 takes before being discharged from the case exhaust valve 23 to the outside of the storage case 20, compared to a case where the cell exhaust valve 19 is located above the center of the storage cell 10B in the vertical direction D3 of the power storage device 1B. Therefore, in the power storage device 1B according to the third embodiment, when the cell exhaust valve 19 is located on the side of the storage cell 10B, the exhaust efficiency of the gas exhausted from the cell exhaust valve 19 to the outside of the storage case 20 through the case exhaust valve 23 is improved. Furthermore, according to the power storage device 1B according to the third embodiment, the exhaust path can be shortened, and thus the area where the high-temperature gas exhausted from the cell exhaust valve 19 contacts the power storage cells 10B can be reduced.

[0060] Furthermore, in the storage device 1B according to the third embodiment, the cell exhaust valve 19 is provided on one of the pair of short side surfaces 13 and 14 of the storage cell 10B (for example, the short side surface 13). According to such a structure, the gas exhausted from the cell exhaust valve 19 moves along the short side surface 13 and is discharged from the housing case 20 through the housing exhaust valve 23. If the cell exhaust valve 19 is provided on one of the pair of long side surfaces 15 and 16 of the storage cell 10B, the gas exhausted from the cell exhaust valve 19 moves within the housing case 20 along the long side surface 15 or the long side surface 16. Therefore, when the cell exhaust valve 19 is provided on one of the pair of long side surfaces 15 and 16 of the storage cell 10B, the area over which the high-temperature gas exhausted from the cell exhaust valve 19 contacts the storage cell 10B becomes larger. However, in the power storage device 1B according to the third embodiment, the cell fume exhaust valve 19 is provided on one of the pair of short side surfaces 13 and 14 of the power storage cell 10B. Therefore, according to the power storage device 1B according to the third embodiment, the area over which the high-temperature gas exhausted from the cell fume exhaust valve 19 contacts the power storage cell 10B can be reduced compared to a case where the cell fume exhaust valve 19 is provided on one of the pair of long side surfaces 15 and 16 of the power storage cell 10B.

[0061] Furthermore, in the power storage device 1B according to the third embodiment, the lower surface 12 of the power storage cell 10B is fixed to the lower case 22 by an adhesive material 30. In the power storage device 1B according to the third embodiment, due to the above-described structure, the gas exhausted from the cell fume exhaust valve 19 moves along the short side surface 13 and is exhausted from the case fume exhaust valve 23 to the outside of the accommodating case 20. Therefore, the power storage device 1B according to the third embodiment can prevent the high-temperature gas exhausted from the cell fume exhaust valve 19 from coming into contact with the adhesive material 30.

[0062] [Implementation Method 4]

[0063] Reference Figure 7 、 Figure 8 as well as Figure 2 , a power storage device according to a fourth embodiment will be described. Figure 7 It is a perspective view schematically showing a power storage device according to a fourth embodiment. Figure 8 It is a cross-sectional view schematically showing the power storage device according to the fourth embodiment.

[0064] Reference Figure 7 The power storage device 1C according to the fourth embodiment is different from the power storage device 1 according to the first embodiment (see Figure 1 ) is different in the arrangement of the storage cells 10. In the storage device 1C according to the fourth embodiment, the storage cells 10 are arranged to extend in the width direction D2 of the vehicle, and the plurality of storage cells 10 are arranged along the front-rear direction D1 of the vehicle. In other respects, the storage device 1C according to the fourth embodiment is different from the storage device 1 according to the first embodiment (see Figure 1 )same.

[0065] Reference Figure 8 ,exist Figure 8 Schematically shows a cross section of the storage device 1C when the storage device 1C is cut by a plane passing through the housing exhaust valve 23 and parallel to the long side surface 16 of the storage cell 10. Figure 8 In the figure, hatching indicating the cross sections of the storage cell 10 , the cell fume exhaust valve 19 , the positive electrode terminal 17 , and the negative electrode terminal 18 is omitted for clarity of the drawing.

[0066] Reference Figure 2 and Figure 8In the storage device 1C according to the fourth embodiment, a pair of short side surfaces 13 and 14 of the storage cell 10 are spaced apart in the width direction D2 of the vehicle, and a pair of long side surfaces 15 and 16 are spaced apart in the front-rear direction D1 of the vehicle. In addition, in the storage device 1C according to the fourth embodiment, the pair of long side surfaces 15 and 16 are respectively formed to extend in the width direction D2 of the vehicle. In addition, in the storage device 1C according to the fourth embodiment, the cell smoke exhaust valve 19 is also provided on one of the pair of short side surfaces 13 and 14. Figure 2 and Figure 8 In the example shown, the cell smoke exhaust valve 19 is provided on the short side surface 13 .

[0067] Reference Figure 8 The two-dot chain line 76 indicates the center of the housing case 20 in the vertical direction D3 of the power storage device 1C. The case smoke exhaust valve 23 is located above the center of the housing case 20 in the vertical direction D3 of the power storage device 1C. That is, the case smoke exhaust valve 23 is located above the center of the lower case 22 in the vertical direction D3 of the power storage device 1C. Furthermore, the cell smoke exhaust valve 19 is located above the center of the power storage cell 10 in the vertical direction D3 of the power storage device 1C.

[0068] In addition, the power storage device 1C is different from the power storage device 1 (see Figure 1 ) is the same as that of the battery cell 10 and includes a cooler 40 for cooling the battery cell 10. The cooler 40 is disposed above the battery cell 10. More specifically, the cooler 40 is disposed along the upper surface 11 in the space between the upper surface 11 of the battery cell 10 and the upper housing 21. Thus, the cooler 40 is located near the battery cell exhaust valve 19.

[0069] A space 50, where cooler 40 is not located, is provided between upper surface 11 of storage cell 10 and upper case 21. Space 50 includes at least a portion of the area facing case smoke exhaust valve 23. Lower surface 12 of storage cell 10 is secured to lower case 22 via adhesive 30.

[0070] Thus, in the power storage device 1C, the cell fume exhaust valve 19, cooler 40, space 50, and case fume exhaust valve 23 are located above the center of the housing case 20 in the vertical direction D3 of the power storage device 1C. Therefore, in the power storage device 1C, similar to the power storage device 1 described above, gas can be efficiently exhausted to the outside through the case fume exhaust valve 23.

[0071] Furthermore, in the power storage device 1C, the cooler 40 is also arranged on the upper surface 11 of each storage cell 10 , thereby suppressing degradation of the upper surface 11 of each storage cell 10 and the like due to heat from the high-temperature gas.

[0072] Furthermore, in the power storage device 1C, the case exhaust valve 23 is also located above the center of the storage case 20 in the vertical direction D3 of the power storage device 1C, and the cell exhaust valve 19 is also located above the center of the storage cell 10 in the vertical direction D3 of the power storage device 1C. Therefore, the exhaust path that the gas exhausted from the cell exhaust valve 19 passes through before being discharged from the case exhaust valve 23 to the outside of the storage case 20 can be shortened.

[0073] [Variation 1]

[0074] Reference Figure 8 In the power storage device 1C, the cell exhaust valve 19, cooler 40, space 50, and case exhaust valve 23 may be provided below the center of the housing case 20 in the vertical direction D3 of the power storage device 1C. The specific structure of the power storage device in this case is as follows.

[0075] The casing smoke exhaust valve 23 is provided at a position below the center of the accommodating casing 20 in the vertical direction D3 of the storage device. That is, the casing smoke exhaust valve 23 is provided at a position below the center of the lower casing 22 in the vertical direction D3 of the storage device. As an example, the casing smoke exhaust valve 23 is provided in the lower casing 22. The battery cell smoke exhaust valve 19 is provided at a position below the center of the storage cell 10 in the vertical direction D3 of the storage device. The cooler 40 is provided along the lower surface 12 in the space between the lower surface 12 of the storage cell 10 and the lower casing 22. Thus, the cooler 40 is located near the battery cell smoke exhaust valve 19. A space 50 in which the cooler 40 is not provided is provided in the space between the lower surface 12 of the storage cell 10 and the lower casing 22. The space 50 includes at least a portion of the area opposite to the casing smoke exhaust valve 23. The upper surface 11 of the storage cell 10 and the upper casing 21 are fixed by the adhesive material 30.

[0076] In an energy storage device with this structure, when gas exhausted from cell exhaust valve 19 fills housing case 20, lower case 22 deforms, creating a gap between lower case 22 and cooler 40, trapping gas in this gap. Subsequently, when the internal pressure within housing case 20 exceeds a specified pressure, housing exhaust valve 23 opens, venting the gas within housing case 20 to the outside. At this time, since housing exhaust valve 23 is located within lower case 22 and gas is also trapped between lower case 22 and cooler 40, gas effectively passes through housing exhaust valve 23 and is exhausted to the outside. Therefore, an energy storage device with this structure also achieves the same effects as energy storage device 1C.

[0077] In addition, such a structure can also be applied to the power storage device 1 (see Figure 3 ). In this case, the same effects as those of the power storage device 1 are achieved.

[0078] [Variation 2]

[0079] In the power storage device 1A according to the second embodiment, the power storage cells 10 may be arranged to extend in the width direction D2 of the vehicle, and the plurality of power storage cells 10 may be arranged along the front-rear direction D1 of the vehicle. Figure 2 In this case, the pair of short sides 13 and 14 of the storage cell 10 are spaced apart in the vehicle width direction D2, and the pair of long sides 15 and 16 are spaced apart in the vehicle front-rear direction D1. Furthermore, the pair of long sides 15 and 16 are formed to extend in the vehicle width direction D2. Furthermore, the cell smoke exhaust valve 19 is provided on one of the pair of short sides 13 and 14. Even in this case, the same effects as those described in the second embodiment are achieved.

[0080] Furthermore, in the power storage device 1B according to the third embodiment, the power storage cells 10B may be arranged to extend in the width direction D2 of the vehicle, and the plurality of power storage cells 10B may be arranged along the front-rear direction D1 of the vehicle. Figure 6 In this case, the pair of short sides 13 and 14 of the storage cell 10B are spaced apart in the vehicle width direction D2, and the pair of long sides 15 and 16 are spaced apart in the vehicle front-rear direction D1. Furthermore, the pair of long sides 15 and 16 are formed to extend in the vehicle width direction D2. Furthermore, the cell smoke exhaust valve 19 is provided on one of the pair of short sides 13 and 14. Even in this case, the same effects as those described in the third embodiment are achieved.

[0081] [Variation 3]

[0082] Reference Figure 2 The cell smoke exhaust valve 19 can also be provided on one of the pair of long side surfaces 15 and 16 of the storage cell 10. Figure 6 The cell smoke exhaust valve 19 may be provided on one of the pair of long side surfaces 15 and 16 of the storage cell 10B.

[0083] The embodiments disclosed herein are all illustrative and not limiting. The scope of the present invention is not limited by the above description but by the claims, and is intended to include all modifications within the scope of the claims and equivalents thereof.

Claims

1. A power storage device comprising: a plurality of battery cells; and a housing for accommodating the plurality of storage cells; It is characterized in that Each of the plurality of storage cells includes a cell exhaust valve disposed on a side of the storage cell and configured to exhaust gas within the storage cell. The housing shell includes a lower shell, an upper shell, and a shell smoke exhaust valve for exhausting gas in the housing shell. The housing smoke exhaust valve is provided at a position above or below the center of the housing housing in the vertical direction of the power storage device. When the housing smoke exhaust valve is provided at a position above the center of the housing, the cell smoke exhaust valve is provided at a position above the center of the storage cell in the vertical direction. When the case smoke exhaust valve is provided below the center of the housing case, the cell smoke exhaust valve is provided below the center of the storage cell in the vertical direction.

2. The power storage device according to claim 1, wherein The case smoke exhaust valve is provided above the center of the lower case, or provided on the upper case, and the cell smoke exhaust valve is provided above the center of the storage cell in the vertical direction.

3. The power storage device according to claim 1, wherein The case smoke exhaust valve is provided below the center of the lower case, and the cell smoke exhaust valve is provided below the center of the storage cell in the vertical direction.

4. The power storage device according to claim 1, wherein The power storage device is mounted on a vehicle, The plurality of storage cells each include an upper surface, a lower surface, a pair of short sides, and a pair of long sides. The pair of long side surfaces are arranged at intervals in the width direction of the vehicle, The pair of long side surfaces are formed to extend in the front-rear direction of the vehicle, The pair of short side surfaces are arranged at intervals in the front-rear direction of the vehicle. The battery cell smoke exhaust valve is arranged on one of the pair of short side surfaces.

5. The power storage device according to claim 1, wherein The power storage device is mounted on a vehicle, The plurality of storage cells each include an upper surface, a lower surface, a pair of short sides, and a pair of long sides. The pair of long side surfaces are arranged at intervals in the front-rear direction of the vehicle. The pair of long side surfaces are formed to extend in the width direction of the vehicle, The pair of short side surfaces are arranged at intervals in the width direction of the vehicle, The battery cell smoke exhaust valve is arranged on one of the pair of short side surfaces.

6. The power storage device according to claim 4 or 5, characterized in that The lower surface is fixed to the lower shell by an adhesive material.

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