Vehicle mounting structure for power storage device

Abstract

To provide a power storage unit which can be arranged so as to correspond to a desired vehicle width in a mounted state where it is mounted on a vehicle, and can improve durability in a side collision of the vehicle.SOLUTION: A power storage unit includes a plurality of power storage devices 100 each having a longitudinal shape and including a long-side portion 81 and a short-side portion 82. The plurality of power storage devices 100 include a plurality of first power storage devices 101 arranged on one side in a first direction DR1, a plurality of second power storage devices 102 arranged on the other side in the first direction DR1, and one or more third power storage devices 103 arranged between the plurality of first power storage devices 101 and the plurality of second power storage devices 102. The plurality of first power storage devices 101 and the plurality of second power storage devices 102 are horizontally arranged side by side in a second direction DR2, and the one or more third power storage devices 103 are vertically arranged.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present disclosure relates to an electricity storage unit mounted on a vehicle and a vehicle mounted with the electricity storage unit. [Background technology]

[0002] As a conventional power storage unit, Japanese Patent Application Laid-Open No. 2010-244760 (Patent Document 1) discloses a technology in which multiple power storage devices with a long-side to short-side length ratio of 2:1 are arranged in a mixed vertical and horizontal orientation. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-244760 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the energy storage unit described in Patent Document 1, when mounted, the energy storage device may be disposed longitudinally on at least one side in the width direction of the vehicle. In this way, when the energy storage unit includes an energy storage device disposed longitudinally on one side in the width direction, there is a concern that the durability of the energy storage unit against a side collision may be insufficient in the event of a side collision of the vehicle.

[0005] On the other hand, in Patent Document 1, when a plurality of power storage devices are arranged in a row so as to be parallel to the front-rear direction of the vehicle, the power storage devices are arranged transversely on both sides of the vehicle in the width direction. However, in this embodiment, since the power storage devices are arranged transversely across the entire width of the vehicle, it may not be possible to appropriately arrange the power storage devices in accordance with the desired vehicle width.

[0006] The present disclosure has been made in consideration of the above-mentioned problems, and an object of the present disclosure is to provide an energy storage unit that can be positioned to correspond to a desired vehicle width when mounted on a vehicle and that can improve durability in the event of a side collision of the vehicle, and a vehicle equipped with the energy storage unit. [Means for solving the problem]

[0007] An energy storage unit according to the present disclosure includes a plurality of energy storage devices each having a rectangular shape in a plan view and including a pair of long sides and a pair of short sides. The plurality of energy storage devices include a plurality of first energy storage devices arranged on one side in a first direction parallel to the width direction of the vehicle when mounted on the vehicle, a plurality of second energy storage devices arranged on the other side in the first direction, and one or more third energy storage devices arranged between the plurality of first energy storage devices and the plurality of second energy storage devices in the first direction. The plurality of first energy storage devices and the plurality of second energy storage devices are arranged side by side in a transverse orientation in a second direction, which is parallel to the front-rear direction of the vehicle, when mounted on the vehicle, such that the short sides are parallel to the second direction and the long sides are parallel to the first direction. The one or more third energy storage devices are arranged vertically such that the short sides are parallel to the first direction and the long sides are parallel to the second direction.

[0008] In the above configuration, the multiple first storage devices and multiple second storage devices located on both sides of the first direction are arranged horizontally and side by side in the second direction so that their short sides are parallel to the second direction and their long sides are parallel to the first direction.

[0009] Therefore, when an impact is input due to a side collision, the plurality of long side portions arranged side by side in the second direction function as support walls.

[0010] On the other hand, when the plurality of first power storage devices and the plurality of second power storage devices are arranged vertically in the second direction, the plurality of short side portions arranged in the second direction function as support walls.

[0011] Therefore, when the plurality of first power storage devices and the plurality of second power storage devices are arranged horizontally in the second direction, the number of support wall portions can be increased compared to when the plurality of first power storage devices and the plurality of second power storage devices are arranged vertically in the second direction. This allows the impact input in a side collision to be dispersed among the plurality of support wall portions, thereby reducing the impact input to each support wall portion. As a result, the impact resistance of the power storage unit in a side collision can be improved.

[0012] Furthermore, by providing one or more third power storage devices in accordance with the vehicle width having a desired size, it is possible to appropriately arrange the power storage devices in accordance with the vehicle width having a desired size.

[0013] In the power storage unit according to the present disclosure, the plurality of first power storage devices and the plurality of second power storage devices may be arranged in a number n (n is an integer of 2 or greater) of rows in the second direction. In this case, it is preferable that, of the plurality of long sides included in the one or more third power storage devices, the long side closest to the plurality of first power storage devices faces the n short side portions of the plurality of pairs of short sides included in the plurality of first power storage devices that are aligned in the second direction on the other side in the first direction. It is also preferable that, of the plurality of long sides included in the one or more third power storage devices, the long side closest to the plurality of second power storage devices faces the n short side portions of the plurality of pairs of short sides included in the plurality of second power storage devices that are aligned in the second direction on the one side in the first direction.

[0014] In the above configuration, the shock resistance of the electricity storage unit in a side collision can be improved, and the installation space for the plurality of electricity storage devices can be effectively utilized.

[0015] In the power storage unit according to the present disclosure, the ratio of the lengths of the short side portions to the long side portions may be 1:n (n is an integer of 2 or more).

[0016] In the above configuration, the plurality of power storage devices can be arranged more efficiently, and the installation space can be reduced.

[0017] In the energy storage unit based on the present disclosure, a plurality of units including the plurality of first energy storage devices, the plurality of second energy storage devices, and the one or more third energy storage devices may be arranged side by side in the second direction.

[0018] In the above configuration, since a plurality of units are arranged side by side in the second direction, it is possible to increase the capacity of the electricity storage unit while improving durability against side collisions.

[0019] In the power storage unit according to the present disclosure, each of the plurality of power storage devices includes a positive external terminal portion and a negative external terminal portion. In this case, the arrangement pattern of the positive external terminal portions and the negative external terminal portions in the plurality of first power storage devices and the plurality of second power storage devices may be the same. Furthermore, the arrangement pattern of the positive external terminal portions and the negative external terminal portions in the one or more third power storage devices may be different from the arrangement pattern of the positive external terminal portions and the negative external terminal portions in the plurality of first power storage devices and the plurality of second power storage devices.

[0020] In the above configuration, it is possible to connect a plurality of power storage devices in series while reducing the number of types of power storage devices with different layout patterns.

[0021] A vehicle based on the present disclosure is equipped with the above-described power storage unit. [Effects of the Invention]

[0022] According to the present disclosure, it is possible to provide a storage unit that can efficiently arrange multiple storage batteries when mounted on a vehicle and can improve durability in the event of a side collision of the vehicle, and a vehicle equipped with the storage unit. [Brief explanation of the drawings]

[0023] [Figure 1] 1 is a diagram schematically showing a vehicle equipped with an electricity storage unit according to a first embodiment. [Figure 2] FIG. 2 is a perspective view schematically showing an electricity storage device provided in the electricity storage unit according to the first embodiment. [Figure 3] FIG. 3 is a cross-sectional view taken along line III-III shown in FIG. [Figure 4] 2 is a perspective view schematically showing an electricity storage module, a conductive member, and the like included in the electricity storage device according to the first embodiment. FIG. [Figure 5] FIG. 2 is a top view of the electricity storage unit according to the first embodiment. [Figure 6] FIG. 10 is a top view of the electricity storage unit according to the second embodiment. [Figure 7] FIG. 11 is a top view of the electricity storage unit according to the third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0024] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the embodiments described below, the same or common parts are denoted by the same reference numerals in the drawings, and the description thereof will not be repeated.

[0025] (Embodiment 1) Fig. 1 is a diagram schematically illustrating a vehicle equipped with an electricity storage unit according to embodiment 1. With reference to Fig. 1, a vehicle 300 equipped with an electricity storage unit 200 according to embodiment 1 will be described.

[0026] Vehicle 300 is a hybrid vehicle that can run using at least one of the power of a motor and an engine, or an electric vehicle that runs using driving force obtained from electrical energy.

[0027] The vehicle 300 includes a front seat 361, a rear seat 362, a floor panel 370, and the electricity storage unit 200.

[0028] Floor panel 370 forms the bottom of the main body of vehicle 300. Front seat 361 and rear seat 362 are arranged inside the interior of vehicle 300. Front seat 361 and rear seat 362 are arranged apart in the front-to-rear direction of the vehicle. Front seat 361 and rear seat 362 are arranged above floor panel 370.

[0029] The power storage unit 200 is mounted on a floor panel 370. The power storage unit 200 is disposed below the rear seat 362, and more particularly, between the rear seat 362 and the floor panel 370.

[0030] The power storage unit 200 supplies electric power to an electric motor for driving the vehicle. Electric power generated by the electric motor through regenerative braking or the like is charged into the power storage unit 200. The power storage unit 200 includes a plurality of power storage devices 100 (see FIG. 2).

[0031] Fig. 2 is a perspective view schematically showing an electricity storage device provided in the electricity storage unit according to embodiment 1. Fig. 3 is a cross-sectional view taken along line III-III shown in Fig. 2. Fig. 4 is a perspective view schematically showing an electricity storage module, conductive members, and the like provided in the electricity storage device according to embodiment 1. The electricity storage device 100 will be described with reference to Figs. 2 to 4.

[0032] 2, the energy storage device 100 has a substantially rectangular parallelepiped shape, and in plan view has a substantially rectangular shape including a longitudinal direction L and a lateral direction S. The energy storage device 100 has a pair of long sides 81 and a pair of short sides 82 in plan view. The energy storage device 100 includes a housing case 2, a positive electrode external terminal 3, and a negative electrode external terminal 4.

[0033] The storage case 2 is formed in a substantially rectangular parallelepiped shape. The storage case 2 includes a top plate 10, a bottom plate 11, side walls 12 and 13, and end walls 14 and 15. The side walls 12 and 13 are arranged in a short-side direction S, and are formed to extend in a longitudinal direction L. The end walls 14 and 15 are arranged in the longitudinal direction L, and are formed to extend in the short-side direction S.

[0034] The positive electrode external terminal 3 and the negative electrode external terminal 4 are provided on the upper surface of the top plate 10. The positive electrode external terminal 3 and the negative electrode external terminal 4 are arranged in the short side direction S with an interval therebetween.

[0035] As shown in FIG. 3, the energy storage device 100 includes an energy storage module 20, conductive members 21 and 22 connected to the energy storage module 20, expansion absorbers 23 and 24, insulating members 25 and 26, and an insulating film 27.

[0036] The energy storage module 20 includes a plurality of energy storage cells 30, 31, 32 stacked in a stacking direction H, and a plurality of connection members 33, 34. The number of energy storage cells included in the energy storage module 20 is not limited to three, and can be changed as appropriate to two or more, four or more, etc.

[0037] Moreover, since the power storage cells 31 and 32 have substantially the same configuration as the power storage cell 30, the power storage cell 30 will be described.

[0038] As shown in FIGS. 2 and 3, the energy storage cell 30 includes an electrode assembly 35, an outer casing 36, a positive electrode current collector plate 37, and a negative electrode current collector plate 38.

[0039] The exterior body 36 is formed of an aluminum laminate film, etc. The exterior body 36 accommodates the electrode body 35 and an electrolyte solution (not shown) inside.

[0040] The exterior body 36 includes an upper film 39A and a lower film 39B. The upper film 39A is disposed so as to cover the electrode body 35 from above, and the lower film 39B is disposed so as to cover the electrode body 35 from below.

[0041] The outer peripheral edge of the upper film 39A and the outer peripheral edge of the lower film 39B are bonded together with an adhesive (not shown).

[0042] The electrode assembly 35 is formed in a rectangular parallelepiped shape. The electrode assembly 35 includes a plurality of positive electrode sheets, a plurality of separators, and a plurality of negative electrode sheets stacked in a stacking direction H. A separator is disposed between the positive electrode sheets and the negative electrode sheets.

[0043] The positive electrode sheet includes an aluminum foil and positive electrode composite layers formed on both sides of the aluminum foil, and the negative electrode sheet includes a copper foil and negative electrode composite layers formed on both sides of the copper foil.

[0044] The aluminum foil constituting the positive electrode sheet is drawn out to one side surface of the electrode body 35, and the copper foil constituting the negative electrode sheet is drawn out to the other side surface of the electrode body 35. The one side surface and the other side surface are arranged in the short side direction S and are formed to extend in the long side direction L.

[0045] The positive electrode current collector 37 is made of aluminum or the like. The positive electrode current collector 37 is disposed on one of the side surfaces (one side in the short side direction S). A plurality of aluminum foils that form a positive electrode sheet are welded to the positive electrode current collector 37.

[0046] An adhesive 52 is formed on the upper surface of the positive current collector 37, and the adhesive 52 bonds the upper film 39A and the positive current collector 37. An adhesive 53 is formed on the lower surface of the positive current collector 37, and the adhesive 53 bonds the lower film 39B and the positive current collector 37. The adhesives 52 and 53 extend to the outside of the exterior body 36 in the short-side direction S.

[0047] The positive current collector 37 protrudes outward from the exterior body 36 and the adhesives 52, 53 on one side in the short-side direction S. The positive current collector 37 includes an exposed portion 50 exposed from the exterior body 36 and the adhesives 52, 53.

[0048] The negative electrode current collector 38 is made of copper or the like. The negative electrode current collector 38 is disposed on the other side surface (the other side in the short side direction S). A plurality of copper foils that form a negative electrode sheet are welded to the negative electrode current collector 38.

[0049] An adhesive 54 is formed on the upper surface of the negative current collector 38, and the adhesive 54 bonds the negative current collector 38 and the upper film 39A together. An adhesive 55 is formed on the lower surface of the negative current collector 38, and the adhesive 55 bonds the negative current collector 38 and the lower film 39B together. The adhesives 54 and 55 extend to the outside of the exterior body 36 in the short-side direction S.

[0050] The negative electrode current collector plate 38 protrudes outward from the exterior body 36 and the adhesives 54, 55 in the short-side direction S, and includes an exposed portion 51 exposed from the exterior body 36 and the adhesives 54, 55.

[0051] 3, the energy storage cell 31 includes a positive current collector 60, a negative current collector 61, and an exterior body 62, with the electrode assembly and electrolyte housed within the exterior body 62. The positive current collector 60 includes an exposed portion 63, similar to the positive current collector 37. The negative current collector 61 includes an exposed portion 64, similar to the negative current collector 38.

[0052] The energy storage cell 32 includes a positive current collector 70, a negative current collector 71, and an exterior body 72, with an electrode assembly and an electrolyte housed within the exterior body 72. The positive current collector 70 includes an exposed portion 73, similar to the positive current collector 37. The negative current collector 71 includes an exposed portion 74, similar to the negative current collector 38.

[0053] The positive current collector 37, the negative current collector 61, and the positive current collector 70 are arranged in the stacking direction H. Similarly, the negative current collector 38, the positive current collector 60, and the negative current collector 71 are arranged in the stacking direction H. That is, the multiple energy storage cells 30, 31, and 32 are stacked such that the positive current collectors and the negative current collectors are alternately arranged in the stacking direction H.

[0054] The connecting member 33 is disposed so as to connect the exposed portion 50 of the positive current collector 37 and the exposed portion 64 of the negative current collector 61. The connecting member 34 is provided so as to connect the exposed portion 63 of the positive current collector 60 and the exposed portion 74 of the negative current collector 71.

[0055] The conductive member 21 is welded to the upper surface of the exposed portion 51 of the negative current collector plate 38. The conductive member 22 is welded to the lower surface of the exposed portion 73 of the positive current collector plate 70.

[0056] 4, the conductive member 21 includes a connection plate 65, a vertical wall 66, a base 67, and a protrusion 68. The connection plate 65 is welded to the upper surface of the exposed portion 51. The connection plate 65 is formed to extend in the longitudinal direction L, and protrudes further toward the end wall 14 than the electricity storage module 20. The connection plate 65 is disposed in the longitudinal direction L, spanning from one end to the other end of the negative current collector plate 38.

[0057] The vertical wall 66 is connected to an end of the connecting plate 65 located on the end wall 14 side. The vertical wall 66 is formed so as to extend upward from the end of the connecting plate 65.

[0058] The base 67 is formed on the upper end of the vertical wall 66, and the protrusion 68 is formed to protrude from the base 67. The upper end of the protrusion 68 is connected to the negative electrode external terminal portion 4 shown in FIG.

[0059] The conductive member 22 includes a connection plate 75, a vertical wall 76, a base 77, and a protrusion 78. The connection plate 75 is welded to the underside of the exposed portion 73 of the positive current collector plate 70. The connection plate 75 is formed to extend in the longitudinal direction L, and protrudes toward the end wall 14 beyond the electricity storage module 20. The connection plate 75 is disposed in the longitudinal direction L, spanning from one end to the other end of the positive current collector plate 70.

[0060] The base 77 is formed on the upper end of the vertical wall 76, and the protrusion 78 is formed to protrude from the base 77. The upper end of the protrusion 78 is connected to the positive electrode external terminal portion 3 shown in FIG.

[0061] 3 again, the expansion absorber 23 is disposed between the upper surface of the power storage module 20 and the top plate 10 of the accommodating case 2. The expansion absorber 24 is disposed between the lower surface of the power storage module 20 and the bottom plate 11 of the accommodating case 2. Each of the expansion absorbers 23, 24 includes a packaging body and a dilatancy material filled in the packaging body.

[0062] The insulating member 25 is filled so as to extend from the side wall 12 to the electricity storage module 20. Note that the exposed portion 50 of the positive current collector plate 37, the exposed portion 64 of the negative current collector plate 61, the connecting member 33, and at least a portion of the conductive member 22 are located within the insulating member 25.

[0063] The insulating member 26 is filled so as to extend from the side wall 13 to the electricity storage module 20. At least a portion of the conductive member 21, the exposed portion 51 of the negative current collector plate 38, the exposed portion 63 of the positive current collector plate 60, and the exposed portion 74 of the negative current collector plate 71 are located within the insulating member 26.

[0064] When the energy storage device 100 configured as described above is charged or discharged, the energy storage module 20 deforms and expands in the stacking direction H. At this time, the expansion absorbers 23, 24 deform, allowing the energy storage module 20 to deform and expand. As a result, even if the energy storage module 20 deforms and expands, the load applied to the accommodating case 2 can be kept small through the expansion absorbers 23, 24. As a result, deformation of the accommodating case 2 can be suppressed.

[0065] Furthermore, when the vehicle 300 is traveling, vibrations may be applied to the power storage device 100. For example, the power storage device 100 may vibrate so that the center of the power storage device 100 in the longitudinal direction L becomes the vibration loop.

[0066] At this time, the displacement speed of the central portion of the energy storage device 100 is faster than the speed at which the energy storage module 20 expands during charging and discharging. Since the expansion absorbers 23, 24 contain dilatancy material, they have high rigidity against rapid deformation. Therefore, the expansion absorbers 23, 24 are less likely to deform, and vibration of the energy storage device 100 is suppressed.

[0067] When the energy storage device 100 is charged or discharged, the temperature of the energy storage module 20 increases. At this time, the insulating member 25 is formed to cover the exposed portions 50, 64, and 73, the connecting member 33, and at least a portion of the conductive member 22. Because the exposed portions 50, 64, and 73, the connecting member 33, and the conductive member 22 are made of a metal material, heat within the energy storage module 20 is efficiently dissipated to the insulating member 25. The heat transferred to the insulating member 25 is dissipated from the side wall 12.

[0068] The insulating member 26 is formed to cover at least a portion of the conductive member 21, the exposed portions 51, 63, and 74, and the connecting member 34. Because the conductive member 21, the exposed portions 51, 63, and 74, and the connecting member 34 are made of a metal material, heat within the energy storage module 20 is efficiently dissipated to the insulating member 26. The heat transferred to the insulating member 26 is then dissipated from the side wall 13. In this way, the energy storage module 20 can be efficiently cooled.

[0069] 4, the connection plate 65 of the conductive member 21 is connected to the negative electrode current collector 38 and is formed to extend in the longitudinal direction L. In the longitudinal direction L, the connection plate 65 is formed from one end to the other end of the negative electrode current collector 38.

[0070] Therefore, when the negative electrode external terminal portion 4 is provided on the end wall 14 side as in this embodiment, the connection plate 65 can be easily connected to the negative electrode external terminal portion 4 by connecting a vertical wall 66 or the like to the end portion on the end wall 14 side.

[0071] Similarly, the connection plate 75 of the conductive member 22 is formed to extend in the longitudinal direction L. In addition, in the longitudinal direction L, the connection plate 75 is disposed across from one end side to the other end side of the negative electrode current collector plate 38.

[0072] Therefore, when the positive electrode external terminal portion 3 is provided on the end wall 14 side as in this embodiment, the connection plate 75 can be easily connected to the positive electrode external terminal portion 3 by connecting a vertical wall 76 or the like to the end portion of the end wall 14 side of the connection plate 75.

[0073] Fig. 5 is a top view of the power storage unit according to embodiment 1. With reference to Fig. 5, the power storage unit 200 according to embodiment 1 will be described.

[0074] The power storage unit 200 includes a plurality of power storage devices 100 and a plurality of bus bars 110. The plurality of power storage devices 100 includes a plurality of first power storage devices 101, a plurality of second power storage devices 102, and a third power storage device 103.

[0075] The plurality of first power storage devices 101 are arranged on one side in a first direction DR1. When the power storage unit 200 is mounted on the vehicle 300, the first direction DR1 is parallel to the width direction of the vehicle.

[0076] The first power storage devices 101 are arranged side by side in a second direction DR2. The second direction DR2 is a direction perpendicular to the first direction DR1, and is parallel to the front-rear direction of the vehicle in the mounted state.

[0077] Each of the plurality of first power storage devices 101 is disposed horizontally such that the short side 82 is parallel to the second direction DR2 and the long side 81 is parallel to the first direction DR1. In the first embodiment, two first power storage devices 101 are disposed horizontally so as to be aligned side by side in the second direction DR2.

[0078] The plurality of second power storage devices 102 are arranged on the other side of the first direction DR1. Each of the plurality of second power storage devices 102 is arranged horizontally so that the short side 82 is parallel to the second direction DR2 and the long side 81 is parallel to the first direction DR1. In the first embodiment, two second power storage devices 102, the same number as the first power storage devices 101, are arranged horizontally side by side in the second direction DR2.

[0079] The third power storage device 103 is disposed in the first direction DR1 between the plurality of first power storage devices 101 and the plurality of second power storage devices 102. The third power storage device 103 is disposed vertically such that the short side 82 is parallel to the first direction DR1 and the long side 81 is parallel to the second direction DR2.

[0080] Of the long side portions 81 included in the third storage device 103, the long side portion 81 located closest to the first storage devices 101 faces two short side portions 82 of the pairs of short side portions 82 included in the first storage devices 101 that are aligned in the second direction DR2 on the other side of the first direction DR1.

[0081] Of the long side portions included in the third storage device 103, the long side portion 81 located closest to the second storage devices 102 faces two short side portions 82 arranged in the second direction DR2 on one side of the first direction DR1 out of the pairs of short side portions 82 included in the second storage devices 102.

[0082] By arranging the third power storage device 103 in this manner, the installation space for the plurality of power storage devices 100 can be effectively utilized.

[0083] As described above, when two first power storage devices 101 and two second power storage devices 102 are arranged side by side in the second direction, the ratio of the lengths of the short side portion 82 and the long side portion 81 is preferably 1:2. By setting such a length ratio, the multiple power storage devices 100 can be arranged more efficiently, and the installation space can be reduced.

[0084] Note that the above describes an example in which the power storage device 100 does not include a cooling device, and in a plan view of the power storage device 100, the ratio of the lengths of the short side and long side in the external shape of the accommodating case 2 is 1:2, but the present invention is not limited to this, and in a case in which a cooling device is provided so as to contact the side wall 12 and / or the side wall 13, the ratio of the lengths of the short side and long side in the external shape including the cooling device may also be 1:2. Furthermore, when a plurality of power storage devices 100 are arranged side by side, a certain amount of space is provided in the gaps between adjacent power storage devices 100 for air or liquid cooling, and by adjusting this gap, the configuration of the present disclosure can be applied even in cases in which the ratio of the lengths of the short side and long side is not 1:2.

[0085] The bus bars 110 connect the negative external terminal portions 4 and the positive external terminal portions 3 in the adjacent power storage devices 100. This allows the power storage devices 100 to be connected in series.

[0086] Here, the second storage battery 102 is a first storage battery 101 rotated 180 degrees and arranged such that the arrangement pattern of the positive electrode external terminal portion 3 and the negative electrode external terminal portion 4 in the plurality of first storage batteries 101 and the plurality of second storage batteries 102 is the same.

[0087] On the other hand, the third power storage device 103 is not rotationally symmetrical to the first power storage device 101 and the second power storage device 102, and the positions of the positive electrode external terminal portion 3 and the negative electrode external terminal portion 4 in the third power storage device 103 are opposite to the positions of the positive electrode external terminal portion 3 and the negative electrode external terminal portion 4 in the first power storage device 101 and the second power storage device 102. In other words, the arrangement pattern of the positive electrode external terminal portion 3 and the negative electrode external terminal portion 4 in the third power storage device 103 is different from the arrangement pattern of the positive electrode external terminal portion 3 and the negative electrode external terminal portion 4 in the first power storage device 101 and the second power storage device 102.

[0088] Specifically, in the first storage battery 101 and the second storage battery 102, when the first storage battery 101 and the second storage battery 102 are arranged so that the positive external terminal portion 3 and the negative external terminal portion 4 are located on the other side of the first direction DR1, the positive external terminal portion 3 is arranged on one side of the second direction DR2, and the negative external terminal portion 4 is arranged on the other side of the second direction DR2.

[0089] On the other hand, in the third storage device 103, when the third storage device 103 is positioned so that the positive electrode external terminal portion 3 and the negative electrode external terminal portion 4 are located on the other side of the first direction DR1, the negative electrode external terminal portion 4 is positioned on one side of the second direction DR2, and the positive electrode external terminal portion 3 is positioned on the other side of the second direction DR2.

[0090] By arranging the positive electrode external terminal portion 3 and the negative electrode external terminal portion 4 in the first storage device 101, the second storage device 102, and the third storage device 103 in the above-described pattern, it is possible to connect multiple storage devices 100 in series while reducing the number of types of storage devices with different arrangement patterns.

[0091] Here, when the power storage unit 200 is mounted on the vehicle 300, if the vehicle 300 is hit in a side collision, an impact is input from the side of the plurality of first power storage devices 101 or the side of the plurality of second power storage devices 102.

[0092] As described above, the multiple first storage devices 101 and the multiple second storage devices 102 are each arranged horizontally and side by side in the second direction DR2 so that the short side portions 82 are parallel to the second direction DR2 and the long side portions 81 are parallel to the first direction DR1.

[0093] Therefore, when an impact is input due to a side collision, the plurality of long side portions 81 arranged side by side in the second direction DR2 function as support walls.

[0094] On the other hand, when the plurality of first storage devices 101 and the plurality of second storage devices 102 are arranged vertically in a row in the second direction DR2, the plurality of short side portions 82 arranged in a row in the second direction DR2 function as support wall portions.

[0095] Therefore, when the plurality of first power storage devices 101 and the plurality of second power storage devices 102 are horizontally arranged side by side in the second direction DR2, the number of support wall portions can be increased compared to when the plurality of first power storage devices 101 and the plurality of second power storage devices 102 are vertically arranged side by side in the second direction DR2. This allows the impact input in a side collision to be dispersed among the plurality of support wall portions, thereby reducing the impact input to each support wall portion. As a result, the impact resistance of the power storage unit 200 against a side collision can be improved.

[0096] Furthermore, in the present embodiment, by providing only one third power storage device 103, power storage unit 200 can be suitably mounted on a vehicle having a width of, for example, approximately 1200 mm or less.

[0097] The number of third power storage devices 103 may be one or more, and can be appropriately changed depending on the vehicle width, thereby allowing power storage devices to be appropriately arranged in accordance with the vehicle width of a desired size.

[0098] (Embodiment 2) Fig. 6 is a top view of the power storage unit according to embodiment 2. With reference to Fig. 6, the power storage unit 200A according to embodiment 2 will be described.

[0099] 6, the energy storage unit 200A according to the second embodiment is different from the energy storage unit 200 according to the first embodiment in the number of third energy storage devices 103. Specifically, the number of third energy storage devices 103 is three. The other configurations are substantially the same.

[0100] Even when configured in this manner, the power storage unit 200A according to the second embodiment can achieve substantially the same effects as the power storage unit 200 according to the first embodiment. Moreover, the power storage unit 200A according to the second embodiment can be suitably mounted on a vehicle 300 having a wider width than that of the first embodiment, and specifically, for example, can be suitably mounted on a vehicle 300 having a width of approximately 1700 mm or less.

[0101] (Embodiment 3) Fig. 7 is a top view of the power storage unit according to embodiment 3. With reference to Fig. 7, the power storage unit 200B according to embodiment 3 will be described.

[0102] 7, the energy storage unit 200B according to the third embodiment is larger in size in a first direction DR1 and a second direction DR2 than the energy storage unit 200 according to the first embodiment, and is disposed below the floor panel 370. The other configurations are substantially the same.

[0103] In this case, a plurality of units 201 each including two first power storage devices 101, two second power storage devices 102, and one third power storage device 103 shown in embodiment 1 are arranged side by side in the second direction DR2. Specifically, four units 201 are arranged side by side in the second direction DR2.

[0104] In this case, as in embodiment 1, the arrangement pattern of the positive electrode external terminal portion 3 and the negative electrode external terminal portion 4 in the third storage device 103 is different from the arrangement pattern of the positive electrode external terminal portion 3 and the negative electrode external terminal portion 4 in the first storage device 101 and the second storage device 102.

[0105] Even when configured in this manner, the energy storage unit 200B according to embodiment 3 can achieve substantially the same effects as the energy storage unit 200 according to embodiment 1. Furthermore, since a plurality of units 201 are arranged side by side in the second direction DR2, the capacity of the energy storage unit 200B can be increased while improving durability against side collisions.

[0106] Furthermore, in the unit 201 of embodiments 1, 2, and 3, the first storage device 101 and the second storage device 102 are described as being arranged in pairs side by side in the second direction DR2, but this is not limited to this, and the number of first storage devices 101 and second storage devices 102 may each be n or more (n is an integer greater than or equal to 2).

[0107] In this case, of the multiple long side portions 81 included in one or more third storage devices 103, the long side portion 81 located closest to the multiple first storage devices 101 may be opposite to n short side portions 82 arranged in the second direction DR2 on the other side of the first direction DR1 among multiple pairs of short side portions 82 included in the multiple first storage devices 101, and the long side portion 81 located closest to the multiple second storage devices 102 may be opposite to n short side portions 82 arranged in the second direction DR2 on one side of the first direction DR1 among multiple pairs of short side portions 82 included in the multiple second storage devices 102.

[0108] Furthermore, the ratio of the lengths of the short side portions 82 and the long side portions 81 may be 1:n (n is an integer of 2 or more). This allows the power storage device 100 to be arranged efficiently.

[0109] In the above-described first to third embodiments, the energy storage cells included in the energy storage module 20 are described as laminated batteries in which an electrolyte solution and an electrode body 35 are housed in an exterior film. However, the present invention is not limited to this, and the energy storage cells may be laminated all-solid-state batteries in which an electrolyte solution is not housed in an exterior film and a solid electrolyte is used.

[0110] The embodiments disclosed herein are illustrative in all respects and are not restrictive. The scope of the present invention is defined by the claims, and includes all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0111] 2 Storage case, 3 Positive electrode external terminal portion, 4 Negative electrode external terminal portion, 10 Top plate, 11 Bottom plate, 12, 13 Side walls, 14, 15 End walls, 20 Energy storage module, 21, 22 Conductive members, 23, 24 Expansion absorbers, 25, 26 Insulating members, 27 Insulating films, 30, 31, 32 Energy storage cells, 33, 34 Connection members, 35 Electrode body, 36 Outer casing, 37 Positive electrode current collector plate, 38 Negative electrode current collector plate, 39A Upper film, 39B Lower film, 50, 51 Exposed portions, 52, 53, 54, 55 Adhesive, 60 Positive electrode current collector plate, 61 Negative electrode current collector plate, 62 Outer casing, 63, 64 Exposed portions, 65 Connection plate, 66 Vertical wall, 67 Base, 68 Protrusion, 70 Positive current collector plate, 71 negative current collector plate, 72 exterior body, 73, 74 exposed portion, 75 connection plate, 76 vertical wall, 77 base, 78 protrusion, 81 long side portion, 82 short side portion, 100 electricity storage device, 101 first electricity storage device, 102 second electricity storage device, 103 third electricity storage device, 110 bus bar, 200, 200A, 200B electricity storage unit, 201 unit, 300 vehicle, 361 front seat, 362 rear seat, 370 floor panel.

Claims

1. A vehicle includes a plurality of power storage devices arranged side by side in the vehicle width direction, Each of the plurality of power storage devices has an elongated shape extending in a longitudinal direction, the plurality of power storage devices include one or more first power storage devices arranged on one side in the vehicle width direction and one or more second power storage devices arranged on the other side in the vehicle width direction, the first power storage device has a first positive external terminal and a first negative external terminal, the second power storage device has a second positive external terminal and a second negative external terminal, In the first power storage device, the first positive external terminal has the highest potential, and the first negative external terminal has the lowest potential; In the second power storage device, the second positive external terminal has the highest potential, and the second negative external terminal has the lowest potential; when viewed from above the vehicle, the first positive external terminal and the first negative external terminal are arranged on the same side in a longitudinal direction of the first power storage device, the second positive external terminal and the second negative external terminal are arranged on the same side in a longitudinal direction of the second power storage device, as viewed from above the vehicle; a member disposed between the one or more first power storage devices and the one or more second power storage devices in the vehicle width direction, a vehicle mounting structure for an electric storage device, wherein, in a plan view, the first positive external terminal and the second negative external terminal are arranged opposite to each other in the vehicle width direction, with at least a portion of the member being located between the first positive external terminal and the second negative external terminal.

2. The vehicle mounting structure for an electric storage device according to claim 1 , wherein the one or more first electric storage devices and the one or more second electric storage devices are arranged in rotational symmetry.

3. The structure for mounting an electric storage device on a vehicle according to claim 2 , wherein the first positive external terminal and the first negative external terminal are provided on an upper surface of the first electric storage device.

4. the plurality of power storage devices include one or more third power storage devices, the one or more third power storage devices are disposed between the one or more first power storage devices and the one or more second power storage devices in the vehicle width direction, a longitudinal direction of the third power storage device is perpendicular to the vehicle width direction, The vehicle mounting structure for an electric storage device according to claim 1 , wherein the member is configured by the one or more third electric storage devices.

5. the third power storage device includes a third positive external terminal and a third negative external terminal, 5. The vehicle mounting structure for an electric storage device according to claim 4, wherein an arrangement pattern of the first positive external terminal and the first negative external terminal is different from an arrangement pattern of the third positive external terminal and the third negative external terminal.

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