Electricity storage device and vehicle

Abstract

This electricity storage device comprises an accommodating case (30), an electricity storage stack (42) accommodated in the accommodating case (30), an electrical appliance (40) accommodated within the accommodating case (30), and a coupling member (32) provided on the accommodating case (30), wherein, if the direction from the electricity storage stack (42) toward the electrical appliance (40) is defined as a first direction (L1) and the direction opposite to the first direction (L1) is defined as a second direction (L2), the coupling member (32) includes: a first connecting part (36) which is connected to a first part; and a second connecting part (35) which is located on the first direction (L1) side of the first connecting part (36), is located above the first connecting part (36), and is connected to a vehicle.

Description

Electricity storage device and vehicle

[0001] The present disclosure relates to a power storage device and a vehicle.

[0002] Various proposals have been made for power storage devices that are disposed on the underside of a vehicle. For example, a battery pack described in Japanese Patent Laid-Open Publication No. 2022-128961 is disposed on the underside of a floor panel of a vehicle. The battery pack houses electrical devices such as a high-voltage junction box and an ECU (Electronic Control Unit).

[0003] Japanese Patent Application Laid-Open No. 2022-128961

[0004] In the electricity storage device configured as described above, there are cases where an impact force is applied to the vehicle when the electricity storage device is mounted on the vehicle.

[0005] At this time, the impact force is transmitted to the electricity storage device, and there is a risk that electrical equipment within the electricity storage device may be seriously damaged.

[0006] The present disclosure has been made in consideration of the above-mentioned problems, and its purpose is to provide an energy storage device to be mounted on a vehicle, in which damage to electrical equipment is suppressed when an impact force is applied to the vehicle.

[0007] The electric storage device according to the present disclosure is an electric storage device arranged under a vehicle, and comprises: a storage case; an electric storage stack accommodated in the storage case; electric equipment accommodated within the storage case; and a connecting member provided on the storage case; where the direction from the electric storage stack toward the electric equipment is defined as a first direction and the direction opposite to the first direction is defined as a second direction, the storage case includes a fixing base material, the fixing base material includes a first portion and a second portion that is provided adjacent to the first portion in the second direction and has lower bending rigidity than the first portion, the electric equipment is fixed to the first portion, and the connecting member includes a first connection portion connected to the first portion, a second connection portion that is located on the first direction side of the first connection portion and higher than the first connection portion and is connected to the vehicle, and a main body portion that is located between the first connection portion and the second connection portion, and the main body portion includes a portion that extends upward as it moves from the first connection portion side to the second connection portion side.

[0008] The energy storage device according to the present disclosure is an energy storage device disposed under a vehicle, and comprises: a storage case; an energy storage stack accommodated in the storage case; an electrical device accommodated within the storage case; and a connecting member provided on the storage case; where the direction from the energy storage stack toward the electrical device is defined as a first direction and the direction opposite to the first direction is defined as a second direction, the storage case includes a fixing base material, the fixing base material includes a first portion and a second portion adjacent to the first portion in the second direction, the first portion includes a reinforcing portion, the electrical device is fixed to the first portion, the connecting member includes a first connection portion fixed to the first portion, a second connection portion located forward of the vehicle than the first connection portion and higher than the first connection portion and fixed to the vehicle, and a main body portion located between the first connection portion and the second connection portion, and the main body portion includes a portion extending upward from the first connection portion side toward the second connection portion side.

[0009] According to the power storage device according to the present disclosure, the power storage device is mounted on a vehicle and can suppress damage to electrical equipment when an impact force is applied to the vehicle.

[0010] 9 is a diagram schematically showing a vehicle 2 on which an energy storage device 1 is mounted. FIG. 10 is a bottom view showing the bottom of the vehicle 2. FIG. 11 is a side cross-sectional view showing the energy storage device 1 and its surrounding configuration. FIG. 12 is a partially exploded perspective view of the energy storage device 1 as viewed from the bottom side. FIG. 13 is a side cross-sectional view showing a reinforcing member 44. FIG. 14 is a side cross-sectional view showing a partition member 47 and its surrounding configuration. FIG. 15 is a side cross-sectional view showing an equipment fixing portion 53 and its surrounding configuration. FIG. 16 is a side cross-sectional view schematically showing a state in which an impact force is applied from the front of the vehicle 2. FIG. 17 is a side cross-sectional view schematically showing a state in which the suspension member 9 is further displaced in the rear direction L2 from the state shown in FIG. 10. FIG. 11 is a cross-sectional view showing an energy storage device 1A. FIG. 12 is a cross-sectional view showing an energy storage device 1B. FIG. 13 is a cross-sectional view showing an energy storage device 1C. FIG. 14 is a cross-sectional view showing an energy storage device 1D. FIG. 15 is a cross-sectional view showing an energy storage device 1E. FIG. 16 is a cross-sectional view showing an energy storage device 1F. FIG. 17 is a cross-sectional view showing an energy storage device 1G. FIG. 18 is a cross-sectional view showing an energy storage device 1H. FIG. 19 is a bottom view showing the bottom of a vehicle 2J. FIG. 19 is a cross-sectional view schematically showing a vehicle 2J and an energy storage device 1J. 1 is a plan view schematically showing the lower case 39, the reinforcing member 44, the device fixing portions 53A, 53B, and the device fixing portions 54A, 54B. FIG. 2 is a plan view schematically showing the distribution of bending rigidity. FIG. 3 is a plan view schematically showing the lower case 39, the reinforcing member 44L, the device fixing portions 53C, 53D, and the device fixing portions 54C, 54D. FIG. 4 is a plan view schematically showing the distribution of bending rigidity. FIG. 5 is a plan view schematically showing the lower case 39, the reinforcing member 44, the device fixing portions 53E, 53F, and the device fixing portions 54E, 54F. FIG. 6 is a plan view schematically showing the distribution of bending rigidity.

[0011] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] The present disclosure will be described with reference to the accompanying drawings, in which the same or corresponding elements are designated by the same reference numerals.

[0012] (First Embodiment) A power storage device 1 according to a first embodiment will be described with reference to Fig. 1 etc. Fig. 1 is a diagram schematically showing a vehicle 2 on which a power storage device 1 is mounted.

[0013] The vehicle 2 includes an electric storage device 1, a vehicle frame 10, a drive unit 11, an exhaust pipe 12, a charging unit 20, and a fuel tank 21. The vehicle frame 10 defines an accommodation space 13 that accommodates the drive unit 11, and a passenger compartment space 14 in which passengers board. The accommodation space 13 is formed on the forward direction L1 side of the passenger compartment space 14.

[0014] The drive device 11 includes an engine 15 , motor generators 16 and 17 , and a PCU 18 .

[0015] The engine 15 burns fuel supplied from a fuel tank 21 to generate driving force for driving the drive wheels 19. The exhaust pipe 12 is connected to the engine 15.

[0016] The PCU 18 includes an inverter and a converter. The PCU 18 converts, for example, DC power supplied from the power storage device 1 into AC power and supplies the AC power to the motor generator 16. The motor generator 16 generates driving force to rotate the drive wheels 19 using the power supplied from the PCU 18. The motor generator 17 mainly functions as a generator.

[0017] The charging unit 20 is configured to be connectable to a charging plug of an external charging stand. The power storage device 1 is configured to be chargeable by power supplied from the charging plug connected to the charging unit 20.

[0018] In this embodiment, the vehicle 2 is a so-called plug-in hybrid vehicle, but the vehicle 2 may also be a hybrid vehicle or an electric vehicle.

[0019] Fig. 2 is a bottom view showing the bottom of the vehicle 2. In Fig. 2 and other figures, "L0" indicates the front-to-rear direction of the vehicle 2, "L1" indicates the front direction of the vehicle 2, and "L2" indicates the rear direction L2 of the vehicle 2. "W0" indicates the vehicle width direction, "W1" indicates the right direction of the vehicle 2, and "W2" indicates the left direction of the vehicle 2.

[0020] The vehicle frame 10 includes a left side rocker 4 and a right side rocker 5 , a floor panel 6 , a left front side member 7 and a right front side member 8 , and a suspension member 9 .

[0021] The bottom of the vehicle frame 10 is formed by a left side rocker 4 , a right side rocker 5 , a floor panel 6 , a left front side member 7 , a right front side member 8 , and a suspension member 9 .

[0022] The left and right side rockers 4, 5 are spaced apart in the width direction W0 of the vehicle 2, and are formed to extend in the front-to-rear direction L0. The floor panel 6 is disposed on the upper surfaces of the left and right side rockers 4, 5.

[0023] The floor panel 6, left front side member 7, and right front side member 8 are located below the storage space 13, and are spaced apart in the vehicle width direction W0. The left front side member 7 is connected to the front end of the left side rocker 4, and the right front side member 8 is connected to the front end of the right side rocker 5.

[0024] The suspension member 9 is disposed below the accommodation space 13 and is connected to the left front side member 7, the right front side member 8, etc. A drive unit 11 and the like are disposed on the upper surface of the suspension member 9.

[0025] The fuel tank 21 is fixed to the bottom of the vehicle frame 10, and is disposed on the rear side of the bottom. The power storage device 1 is fixed to the bottom of the vehicle frame 10. The power storage device 1 is disposed forward in a direction L1 from the fuel tank 21. The power storage device 1 is disposed so as to be shifted to the left width direction W2 in the vehicle width direction W0.

[0026] The exhaust pipe 12 is connected to a fuel tank 21, and is formed so as to pass along the side of the power storage device 1 and extend in a forward direction L1.

[0027] A heat insulating cover 22 is provided on the exhaust pipe 12. The heat insulating cover 22 is provided so as to cover the exhaust pipe 12 from above. The heat insulating cover 22 is arranged between the exhaust pipe 12 and the power storage device 1 and between the exhaust pipe 12 and the vehicle frame 10.

[0028] The energy storage device 1 is fixed to a vehicle frame 10. The energy storage device 1 includes a housing case (not shown), an impact absorbing member 29, a shear panel 34 that covers the housing case, protective plates 32 and 33, and a plurality of fixing brackets 31. The energy storage device 1 is fixed to the vehicle frame 10 by the fixing brackets 31.

[0029] The impact absorbing member 29 is disposed adjacent to the power storage device 1 in the vehicle width direction W0. The impact absorbing member 29 is fixed to the left side rocker 4.

[0030] The protective plate 32 and the protective plate 33 are disposed adjacent to each other in the vehicle width direction W0. The front end of the protective plate 33 is fixed to the suspension member 9, and the rear end is fixed to a reinforcing member 44, which will be described later.

[0031] 3 is a side cross-sectional view showing the configuration of the energy storage device 1 and its surroundings. The protective plate 32 includes a second connection portion 35, a first connection portion 36, and a main body portion 37. The second connection portion 35 is located further forward in the direction L1 than the first connection portion 36. The second connection portion 35 is connected to the suspension member 9. Specifically, the second connection portion 35 is fixed to the suspension member 9 with a plurality of bolts or the like. The first connection portion 36 is fixed to a reinforcing member 44, which will be described later. The second connection portion 35 is located higher than the first connection portion 36 and is located on the front side of the vehicle 2 in the direction L1. The main body portion 37 is formed to extend upward from the first connection portion 36 toward the second connection portion 35.

[0032] A first bent portion 24 is formed at the connection portion between the first connecting portion 36 and the main body portion 37, and a second bent portion 23 is formed at the connection portion between the second connecting portion 35 and the main body portion 37.

[0033] The bending angle of the second bent portion 23 in the normal state is defined as bending angle A1, and the bending angle of the first bent portion 24 is defined as bending angle A2. The bending angle A1 and the bending angle A2 are, for example, equal to or greater than 3 degrees and equal to or less than 15 degrees.

[0034] The energy storage device 1 includes a housing case 30 , an electric device 40 , an energy storage stack 42 , a connector 43 , a shear panel 34 , a cooling device 46 , a partition member 47 , and a partition wall 48 .

[0035] The storage case 30 includes an upper case 38 and a lower case 39. The upper case 38 is formed to open downward, and is fixed to the lower case 39. The upper case 38 and the lower case 39 are formed of a metal material such as an aluminum alloy.

[0036] The lower case 39 includes a bottom plate (fixed base) 50, a peripheral wall 51, and a lower flange 57. The bottom plate 50 includes a bottom main body 50A and a reinforcing member 44. The reinforcing member 44 is provided on the underside of the bottom main body 50A. The peripheral wall 51 is formed to rise upward from the outer peripheral edge of the bottom main body 50A. The lower flange 57 is formed to protrude outward from the upper end of the peripheral wall 51. The peripheral wall 51 includes a front wall 52 located in the forward direction L1.

[0037] Upper case 38 includes a top plate 77 and an upper flange 78. Flange 78 is formed on the outer peripheral edge of top plate 77 and is formed to protrude outward. Upper flange 78 and lower flange 57 are welded to each other, and upper flange 78 and lower flange 57 form flange 79, which is formed to protrude outward from peripheral wall 51.

[0038] The electric device 40, the power storage stack 42, and the partition member 47 are housed in the housing case 30. When viewed from the vehicle width direction W0, the electric device 40 is disposed in the forward direction L1 from the power storage stack 42. The electric device 40 being located in the forward direction L1 from the power storage stack 42 means, for example, that when the electric device 40 and the power storage stack 42 are viewed from the vehicle width direction W0, the center of the electric device 40 in the front-rear direction L0 is located further forward in the forward direction L1 than the center of the power storage stack 42 in the front-rear direction L0.

[0039] The electrical device 40 includes at least one of a connection device 41A and a control device 41B. In the present embodiment, both the connection device 41A and the control device 41B are mounted on the power storage device 1, and the electrical device 40 includes both the connection device 41A and the control device 41B. The connection device 41A includes, for example, at least one of an SMR that switches the electrical connection between the power storage stack 42 and the PCU 18, a charging relay that switches the electrical connection between the power storage stack 42 and the charging unit 20, and a high-voltage electrical circuit. The control device 41B is disposed above the connection device 41A. The control device 41B includes a control device such as a battery ECU.

[0040] The end of the connection device 41A in the forward direction L1 is located closer to the front wall 52 than the end of the control device 41B in the forward direction L1. The connector 43 is connected to the connection device 41A and is disposed on the outer surface side of the front wall 52. A high-voltage cable is connected to the connector 43. In the forward / backward direction L0, the first bent portion 24 is located closer to the connector 43 in the forward direction L1.

[0041] The electrical device 40 is fixed to the bottom plate 50 by a plurality of device fixing portions 53 and a plurality of device fixing portions 54. The device fixing portions 54 are arranged on the rearward direction L2 side of the device fixing portion 53. The device fixing portions 53 are provided in a plurality at intervals in the vehicle width direction W0, and the device fixing portions 54 are also provided in a plurality at intervals in the vehicle width direction W0.

[0042] The power storage stack 42 is disposed at a distance in the rear direction L2 from the electrical device 40. The power storage stack 42 includes a plurality of power storage modules 55, and each power storage module 55 includes a plurality of power storage cells. The plurality of power storage modules 55 are arranged in the front-rear direction L0, and the power storage cells are arranged in the vehicle width direction W0.

[0043] The partition member 47 is fixed to the inner surface of the bottom main body 50A and is formed to extend in the vehicle width direction W0. The partition member 47 includes a main body 59, a flange 63, and a flange 64.

[0044] The main body 59 includes a top plate 60 and vertical walls 61 and 62. The vertical wall 61 is formed to extend downward from the front edge of the top plate 60, and the vertical wall 62 is formed to extend downward from the rear edge of the top plate 60.

[0045] The main body 59 is located between the device fixing portion 54 and the power storage stack 42 in the front-rear direction L0. The main body 59 of the partition member 47 is disposed so as to overlap the electric device 40 in the front-rear direction L0. Specifically, the top plate 60 of the partition member 47 is located above the lower surface of the control device 41B.

[0046] The flange 63 is formed to extend from the lower side of the vertical wall 61 in the forward direction L1, and the flange 64 is formed to extend from the lower side of the vertical wall 62 in the rearward direction L2.

[0047] 4 is a partially exploded perspective view of the energy storage device 1 as viewed from the bottom side, with the shear panel 34 removed.

[0048] The protection plates 32 and 33 and the cooling device 46 are disposed on the lower surface of the lower case 39 .

[0049] The shear panel 34 is provided to cover the lower case 39, the cooling device 46, and the reinforcing member 44. The shear panel 34 is fixed to the shock absorbing member 29.

[0050] 5 is a perspective view showing the reinforcing member 44. The reinforcing member 44 includes a front edge 90 located in the forward direction L1, a rear edge 91 located in the rearward direction L2, a side edge 92 located in the widthwise right direction W1, and a side edge 93 located in the widthwise left direction W2.

[0051] The reinforcing member 44 includes a plurality of bulging portions 69A and a plurality of bulging portions 69B. The bulging portions 69A are formed to bulge upward, and the bulging portions 69B are formed to bulge downward. The bulging portions 69A and the bulging portions 69B are formed to extend in the front-to-rear direction L0. The bulging portions 69A and the bulging portions 69B are formed alternately in the vehicle width direction W0.

[0052] The welded portion 67 is formed on the front end side of the bulging portion 69 A, and the welded portion 68 is formed on the rear end side of the bulging portion 69 A. The welded portions 67 and 68 secure the reinforcing member 44 to the underside of the bottom body 50 A.

[0053] The fixing member 65 is provided at the front end of the bulging portion 69B, and the fixing member 66 is provided at the rear end of the bulging portion 69B.

[0054] The multiple fixing members 65 include multiple fixing members 65A and multiple fixing members 65B. Fixing member 65A fixes protective plate 32 to the lower surface of reinforcing member 44. Fixing member 65B fixes protective plate 33 to the lower surface of reinforcing member 44. Fixing member 66 fixes a shear panel (not shown) to the lower surface of reinforcing member 44. Note that fixing member 66 and welded portion 68 are arranged in the vehicle width direction W0, and fixing members 65A, 65B and welded portion 67 are also arranged in the vehicle width direction W0. In other words, fixing member 66 and welded portion 68 are provided at the same position in the front-rear direction L0, and fixing members 65A, 65B and welded portion 67 are provided at the same position in the front-rear direction L0.

[0055] 4 , the cooling device 46 includes a cooling body 70, a refrigerant flow section 71, and a plurality of fixing brackets 73. As shown in FIG. 3 , the power storage stack 42 is disposed above the cooling body 70, and the power storage stack 42 is cooled by the refrigerant flowing through the refrigerant flow section 71. A refrigerant passage through which the refrigerant flows is formed within the cooling body 70.

[0056] A supply passage for supplying refrigerant to the cooling body 70 and a discharge passage for discharging refrigerant discharged from the cooling body 70 are formed inside the refrigerant flow section 71. The refrigerant is, for example, a liquid refrigerant.

[0057] Pipes 75 and 76 are connected to refrigerant flow portion 71. Pipes 75 and 76 are arranged adjacent to connector 43 in the vehicle width direction W0. Protective plate 32 is provided to cover connector 43 from below, and protective plate 33 is provided to cover pipes 75 and 76 from below.

[0058] The plurality of fixing brackets 73 fix the cooling device 46 to the lower case 39. Each fixing bracket 73 is formed in a strip shape. The fixing brackets 73 include a plurality of fixing brackets 73A connected to the reinforcing member 44.

[0059] 6 is a side cross-sectional view showing the partition member 47 and its surrounding configuration. The partition wall 48 is formed to extend upward from the upper surface of the top plate 60. The distance L6 between the upper end 85 of the partition wall 48 and the upper case 38 is smaller than the distance L7 between the control device 41B and the upper case 38. The partition wall 48 is also formed to extend in the vehicle width direction W0. Both sides of the partition wall 48 in the vehicle width direction W0 are connected to the peripheral wall 51 of the lower case 39. The partition wall 48 is connected, for example, to a side wall of the peripheral wall 51. The partition wall 48 may be directly connected to the peripheral wall 51 or may be connected to the side wall via a bracket or the like.

[0060] A curved portion 86 is formed in the top plate 77 of the upper case 38 at a portion located above the upper end 85. In the example shown in Fig. 6, the curved portion 86 is formed to be recessed downward. The curved portion 86 is formed to extend in the vehicle width direction W0.

[0061] The device fixing portion 54 is connected to the flange 63 and the bottom main body 50A, and is disposed at a distance in the forward direction L1 from the vertical wall 61. The rear edge 91 of the reinforcing member 44 is located below the flange 63 in the downward direction D2 and is located further forward in the forward direction L1 than the vertical wall 61. In the front-to-rear direction L0, the device fixing portion 54 is located further forward in the forward direction L1 than the rear edge 91.

[0062] In the bottom plate 50 of the lower case 39, a portion located forward of the rear edge 91 is referred to as a first portion P1, and a portion located between the rear edge 91 and the vertical wall 61 is referred to as a second portion P2. The second portion P2 is located adjacent to the first portion P1 in the rear direction L2.

[0063] The portion of the bottom plate 50 of the lower case 39 where the main body 59 of the partition member 47 is located is referred to as a third portion P3. The third portion P3 is located adjacent to the second portion P2 in the rear direction L2. The portion of the bottom plate 50 of the lower case 39 that is located further rearward in the rear direction L2 than the third portion P3 is referred to as a fourth portion P4.

[0064] The device fixing portion 54 is disposed on the first portion P1. The power storage stack 42 is fixed to the fourth portion P4. As shown in Fig. 4, the fixing bracket 31 is disposed on the rearward direction L2 side of the second portion P2.

[0065] 7 is a side cross-sectional view showing the device fixing portion 53 and its surrounding configuration. The front edge 90 of the reinforcing member 44 is located further forward in the forward direction L1 than the front end of the bottom body 50A in the forward direction L1. In the front-to-rear direction L0, the first portion P1 of the bottom plate 50 is a portion of the bottom plate 50 located between the rear edge 91 shown in FIG. 6 and the front end of the bottom body 50A in the forward direction L1. The device fixing portion 53 is fixed to the first portion P1.

[0066] 6 and 7, the reinforcing member 44 and the bottom body 50A are located at the portion of the bottom plate 50 where the first portion P1 is located. On the other hand, the reinforcing member 44 is not provided at the portion of the bottom plate 50 where the second portion P2 is located. Therefore, the second moment of area M1 of the first portion P1 is greater than the second moment of area M2 of the second portion P2. Furthermore, the bending stiffness B1 of the first portion P1 is greater than the bending stiffness B2 of the second portion P2.

[0067] The reinforcing member 44 has bulges 69A and 69B, which increases the bending stiffness B1 of the first portion P1 compared to when the reinforcing member 44 is flat. The metal material forming the reinforcing member 44 has a higher Young's modulus than the metal material forming the lower case 39. This increases the difference between the bending stiffness B1 and the bending stiffness B2.

[0068] The main body 59 of the partition member 47 is located in the third portion P3, and the second moment of area M3 is greater than the second moment of area M2. Therefore, the bending stiffness B3 of the third portion P3 is greater than the bending stiffness B2 of the second portion P2. The metal material forming the partition member 47 has a higher Young's modulus than the metal material forming the lower case 39. Therefore, the difference between the bending stiffness B3 and the bending stiffness B2 is large.

[0069] In the vehicle 2 equipped with the electricity storage device 1 configured as described above, an impact force may be applied from the front of the vehicle 2.

[0070] 8 is a side cross-sectional view that schematically illustrates a state in which an impact force is applied from the front of the vehicle 2. When an impact force is applied from the front of the vehicle 2, the suspension member 9 is displaced in the rear direction L2. Accordingly, the second bent portion 23 is deformed so that the bending angle A1 of the second bent portion 23 becomes smaller. Accordingly, the end of the main body portion 37 on the first bent portion 24 side and the first bent portion 24 are displaced downward. As the first bent portion 24 is displaced downward, the bending angle A2 of the first bent portion 24 is deformed so as to become smaller, and a portion of the first connecting portion 36 that is located further in the forward direction L1 than the portion fixed by the fixing member 65A is bent.

[0071] At this time, since the first bent portion 24 is located further to the front direction L1 side than the connector 43 , contact between the second bent portion 23 and the main body portion 37 and the connector 43 can be prevented.

[0072] As the first bent portion 24 is displaced downward, a load F1 and a bending moment BM1 are applied downward to the first connecting portion 36 and the fixing member 65A, which is the fixing portion of the reinforcing member 44.

[0073] Here, since the bending rigidity B1 of the first portion P1 is high and the bending rigidity B2 of the second portion P2 is low, the second portion P2 is prone to bending.

[0074] FIG. 9 is a side cross-sectional view that schematically shows a state in which the suspension member 9 is further displaced in the rear direction L2 from the state shown in FIG.

[0075] 9, the bend occurs at the second portion P2. The first portion P1 is located further forward in the forward direction L1 than the second portion P2, and the device fixing portion 53 and the device fixing portion 54 are located at the first portion P1.

[0076] As a result, the electric device 40 and the first portion P1 are displaced downward together around the second portion P2. Displacing the electric device 40 together can prevent the electric device 40 from being damaged. That is, if the bending portion of the bottom plate 50 is located between the device fixing portion 53 and the device fixing portion 54 in the front-rear direction L0, an external force that bends the electric device 40 may be applied to the electric device 40 when the bottom plate 50 bends, which may result in damage to the electric device 40. On the other hand, the energy storage device 1 according to the present embodiment can prevent such a problem from occurring.

[0077] The second portion P2 is located in the front-rear direction L0 between the first portion P1, which has a bending stiffness higher than the bending stiffness B2, and the third portion P3, which has a bending stiffness higher than the bending stiffness B2.

[0078] Therefore, when a load F1 and a bending moment BM1 are applied to the fixing member 65A, the fixing member 65A is likely to bend at the second portion P2, and bending at a position shifted from the second portion P2 can be suppressed.

[0079] Bending of the second portion P2 suppresses deformation of the fourth portion P4, which is located further rearward in the direction L2 than the second portion P2. The bending rigidity of the fourth portion P4 may be made higher than that of the second portion P2. For example, the bending rigidity of the fourth portion P4 can be increased by disposing a reinforcing member in the fourth portion P4 or by increasing the thickness of the portion of the bottom plate 50 where the fourth portion P4 is located. The bending rigidity of the fourth portion P4 reduces the bending rigidity of the first portion P1.

[0080] Furthermore, since the power storage stack 42 is fixed to the fourth portion P4 and deformation of the fourth portion P4 is suppressed, damage to the power storage stack 42 can be suppressed.

[0081] When the first portion P1 is displaced downward around the second portion P2, the curved portion 86 of the upper case 38 is deformed so as to extend, thereby preventing cracking of the upper case 38. By preventing cracking of the upper case 38, it is possible to prevent water or other foreign matter from entering the energy storage device 1 from the outside, even after an impact force is applied.

[0082] 6, the distance L6 between the upper end 85 of the partition wall 48 and the upper case 38 is smaller than the distance L7 between the control device 41B and the upper case 38. Therefore, when the upper case 38 deforms, the partition wall 48 can support the upper case 38 before the upper case 38 comes into contact with the control device 41B. This makes it possible to prevent damage to the control device 41B due to deformation of the upper case 38.

[0083] The partition wall 48 is formed to extend in the vehicle width direction W0. Therefore, even if the control device 41B is displaced in the rear direction L2 due to an impact force, the partition wall 48 can support the control device 41B and prevent the control device 41B from coming into contact with the power storage stack 42.

[0084] The rear edge 91 of the reinforcing member 44 is located below the flange 63. Because the flange 63 is located above the rear edge 91, the flange 63 functions as a protective wall when the bottom plate 50 is deformed around the second portion P2. This prevents the deformed bottom plate 50 from coming into contact with the electrical device 40, etc., even if the bottom plate 50 is deformed at the second portion P2.

[0085] The top plate 60 of the partition member 47 is located above the underside of the control device 41B. Therefore, even if the control device 41B is displaced in the rear direction L2 due to an impact force, the control device 41B is supported by the partition member 47, and it is possible to prevent the control device 41B from coming into contact with the power storage stack 42.

[0086] 4, the cooling body 70 of the cooling device 46 is disposed on the lower surface of the bottom plate 50, at the fourth portion P4. Therefore, when the bottom plate 50 bends at the second portion P2, damage to the cooling body 70 can be suppressed.

[0087] The fixed bracket 73A connects the cooling body 70 and the reinforcing member 44, and when the bottom plate 50 bends at the second portion P2 and the reinforcing member 44 is displaced, the fixed bracket 73A also bends and deforms.

[0088] On the other hand, because the fixed bracket 73A is formed in a strip shape, when the fixed bracket 73A bends, a large load is prevented from being applied to the cooling body 70. This makes it possible to prevent the cooling body 70 from being deformed when the fixed bracket 73A is deformed.

[0089] Second Embodiment A power storage device 1A according to a second embodiment will be described with reference to Fig. 10 and other figures. The power storage device 1A includes a protective plate 32A. The power storage device 1A has substantially the same configuration as the power storage device 1, except for the protective plate 32A.

[0090] 10 is a cross-sectional view showing the energy storage device 1A. The protective plate 32A includes a first connection portion 36, a second connection portion 35, and a main body portion 37A.

[0091] The first connection portion 36 includes a thick portion 36A. The thick portion (overlapping portion) 36A overlaps the electrical device 40 in the up-down direction of the first connection portion 36.

[0092] The thickness of the thick portion 36A is greater than the thickness of the other portions of the protective plate 32A except for the thick portion 36A. The bending rigidity of the thick portion 36A is greater than the bending rigidity of the other portions of the protective plate 32A.

[0093] The first connecting portion 36 includes a thick portion 36A and a thin portion 36B. The thin portion 36B is located on the front direction L1 side of the thin portion 36B. The bending rigidity of the thin portion 36B is lower than the bending rigidity of the thick portion 36A.

[0094] The main body portion 37A is formed to be thicker than the second connection portion 35 and the thin portion 36B. The bending rigidity of the main body portion 37A is higher than the bending rigidity of both the second connection portion 35 and the thin portion 36B.

[0095] When an impact force is applied from the front of the vehicle 2 on which the power storage device 1A configured as described above is mounted, the protection plate 32A is deformed.

[0096] At this time, because the bending rigidity of the thick portion 36A is higher than the bending rigidity of the thin portion 36B, the thin portion 36B bends downward from the connection portion between the thin portion 36B and the thick portion 36A, thereby preventing the thin portion 36B from coming into contact with the connector 43.

[0097] In particular, since the thick portion 36A is less likely to deform, damage to the bottom plate 50 by the thick portion 36A can be suppressed.

[0098] Since the bending rigidity of the main body 37A is higher than the bending rigidity of the thin portion 36B, the first bent portion 24 is easily bent so as to be displaced downward. This makes it easier for the thin portion 36B to separate from the connector 43 during deformation.

[0099] Third Embodiment A power storage device 1B according to a third embodiment will be described with reference to Fig. 11 and other figures. The power storage device 1B includes a protective plate 32B. The power storage device 1B is configured substantially similarly to the power storage device 1 except for the protective plate 32B.

[0100] 11 is a cross-sectional view showing the energy storage device 1B. The protective plate 32B includes a first connection portion 36, a second connection portion 35, a main body portion 37, and a reinforcing plate 24B. The reinforcing plate 24B is fixed to the lower surface of the first bent portion 24.

[0101] Therefore, the bending rigidity of the first bent portion 24 is higher than the bending rigidity of the second bent portion 23 .

[0102] Therefore, when an impact force is applied from the front of the vehicle 2 and the protection plate 32B is deformed, the first bent portion 24 can be prevented from bending significantly.

[0103] If the first bent portion 24 bends significantly and the main body portion 37 displaces around the first bent portion 24 , the main body portion 37 will be more likely to come into contact with the connector 43 .

[0104] On the other hand, in the protective plate 32B, the first bent portion 24 is prevented from being significantly deformed, and therefore, the occurrence of the above-mentioned adverse effects can be prevented.

[0105] Fourth Embodiment A power storage device 1C according to a fourth embodiment will be described with reference to Fig. 12 and other figures. The power storage device 1C includes a reinforcing member 44C. The power storage device 1C is configured substantially similarly to the power storage device 1 except for the reinforcing member 44C.

[0106] 12 is a cross-sectional view showing the energy storage device 1C. In the front-rear direction L0, a front edge 90C of the reinforcing member 44C is located closer to the front end of the flange 79 in the front-rear direction L1.

[0107] Therefore, even if the main body 37 is displaced around the first bent portion 24 so that the bending angle of the first bent portion 24 becomes smaller when the protective plate 32 is deformed, the front edge 90C comes into contact with the main body 37, thereby preventing the main body 37 from coming into contact with the flange 79. This prevents damage to the accommodating case 30.

[0108] Fifth Embodiment A power storage device 1D according to a fifth embodiment will be described with reference to Fig. 13 and other figures. The power storage device 1D includes a bottom plate 50D. The configuration of the power storage device 1D is substantially the same as that of the power storage device 1, except for the configuration of the power storage device 1.

[0109] 13 is a cross-sectional view showing an energy storage device 1D. A bottom plate 50D includes a reinforcing member 44D and a bottom main body 50A. The reinforcing member 44D includes a front edge 90D located in the forward direction L1 and a rear edge 91D located in the rear direction L2.

[0110] The thickness of the reinforcing member 44D at the rear edge 91D is greater than the thickness of the reinforcing member 44D at the front edge 90D. The bending rigidity at the rear edge 91D is greater than the bending rigidity at the front edge 90D.

[0111] Therefore, the difference in bending rigidity between the first portion P1 where the rear edge 91D is located and the second portion P2 becomes large, which prevents the position at which the bottom plate 50D bends from shifting from the second portion P2 when an impact force is applied.

[0112] Furthermore, the portion of the bottom plate 50D where the rear edge 91D is located can be prevented from being significantly deformed. The device fixing portion 54 is located near the rear edge 91D, and this can prevent the rear edge 91D and its surrounding area from being significantly deformed, thereby preventing the device fixing portion 54 from being deformed and damaging the electrical device 40.

[0113] In the example shown in Figure 13, the thickness is made to increase from the front edge 90D side to the rear edge 91D side, and the bending rigidity is made to increase from the front edge 90D side to the rear edge 91D side.

[0114] Sixth Embodiment A power storage device 1E according to a sixth embodiment will be described with reference to Fig. 14 and other figures. The power storage device 1E includes a bottom plate 50E. The configuration of the power storage device 1E is substantially the same as that of the power storage device 1, except for the configuration of the power storage device 1.

[0115] 14 is a cross-sectional view showing an energy storage device 1E. A bottom plate 50E includes a reinforcing member 44E and a bottom main body 50A. The reinforcing member 44E includes a front edge 90E located in the forward direction L1 and a rear edge 91E located in the rear direction L2.

[0116] The thickness of the reinforcing member 44E at the front side 90E is greater than the thickness of the reinforcing member 44E at the rear side 91 E. The bending rigidity at the front side 90E is greater than the bending rigidity at the rear side 91 E.

[0117] Here, during a collision, when a load and bending moment in the downward direction D2 is applied to the front edge 90E side through the fixing member 65A, deformation of the front edge 90E and the surrounding portion of the reinforcing member 44E is suppressed.

[0118] As a result, the first connection portion 36 bends near the fixing member 65A, and the first connection portion 36 is easily displaced downward around this bent portion, thereby preventing the protective plate 32 from coming into contact with the connector 43.

[0119] Since the bottom plate 50E is prevented from being significantly deformed on the front edge 90E side, the device fixing portion 53 arranged near the front edge 90E is prevented from being deformed, thereby preventing damage to the electric device 40.

[0120] Seventh Embodiment A power storage device 1F according to a seventh embodiment will be described with reference to Fig. 15 and other figures. The power storage device 1F includes a protective plate 32F. The configuration of the power storage device 1F is substantially the same as that of the power storage device 1, except for the protective plate 32F.

[0121] 15 is a cross-sectional view showing an energy storage device 1F. The protective plate 32F includes a first connection portion 36F, a main body portion 37F, a second connection portion 35F, a first bent portion 24F, a second bent portion 23F, a leading end portion 25, and a rear end portion 26. The leading end portion 25 is located at the end of the protective plate 32F in the forward direction L1. The rear end portion 26 is located at the end of the protective plate 32F in the rear direction L2.

[0122] In the protective plate 32F, the thickness of the rear end portion 26 is greater than the thickness of the front end portion 25. Therefore, the bending rigidity of the rear end portion 26 and its surrounding area is greater than the bending rigidity of the front end portion 25 and its surrounding area. Therefore, when the protective plate 32F deforms, the rear end portion 26 and its vicinity can be prevented from deforming significantly. As a result, damage to the electric device 40 can be prevented.

[0123] The thickness of the protective plate 32F increases from the leading end 25 toward the rear end 26. Therefore, when the suspension member 9 is displaced rearward due to a collision, the first bent portion 24F is less likely to deform, and it is possible to prevent the main body 37F from contacting the connector 43 and damaging the connector 43.

[0124] On the other hand, the load and bending moment applied to the protection plate 32F from the suspension member 9 are easily transmitted to the second portion P2, and the bottom plate 50 can be bent at the second portion P2.

[0125] Eighth Embodiment An energy storage device 1G according to an eighth embodiment will be described with reference to Fig. 16 and other figures. The energy storage device 1G includes a protective plate 32G. The configuration of the energy storage device 1G is substantially the same as that of the energy storage device 1, except for the protective plate 32G.

[0126] 16 is a cross-sectional view showing the energy storage device 1G. The protective plate 32G includes a first connection portion 36G, a main body portion 37G, a second connection portion 35G, a first bent portion 24G, a second bent portion 23G, a leading end portion 25, and a rear end portion 26.

[0127] The thickness of the tip portion 25 is greater than the thickness of the rear end portion 26 , and the bending rigidity of the tip portion 25 is greater than the bending rigidity of the rear end portion 26 .

[0128] Therefore, even if an impact force is applied to the second connection part 5G from the suspension member 9, the connection state between the second connection part 35G and the suspension member 9 can be maintained. This makes it possible to transmit the load and bending moment to the second part P2.

[0129] In the example shown in FIG. 16, the thickness of the protection plate 32G is formed to increase from the first bent portion 24G toward the tip end portion 25.

[0130] When an impact force is applied from the suspension member 9 to the protective plate 32G, a large load is applied particularly between the first bent portion 24G and the tip end 25. This may cause damage or fracture to the portion located between the first bent portion 24G and the tip end 25. On the other hand, the protective plate 32G can prevent the above-mentioned problems from occurring.

[0131] The thickness of the protection plate 32G may be increased from the rear end 26 toward the front end 25.

[0132] Ninth Embodiment A power storage device 1H according to a ninth embodiment will be described with reference to Fig. 17 and other figures. The power storage device 1H includes a protective plate 32H. The configuration of the power storage device 1H is substantially the same as that of the power storage device 1, except for the protective plate 32H.

[0133] 17 is a cross-sectional view showing an energy storage device 1H. A protective plate 32H includes a first connection portion 36H, a main body portion 37H, a second connection portion 35H, a first bent portion 24H, a second bent portion 23H, a leading end portion 25, and a rear end portion 26.

[0134] The connector 43 is located further to the rearward direction L2 side than at least one of the leading ends of the lower flange 57, the flange 78, and the flange 79 on the forward direction L1 side.

[0135] The distance in the vertical direction D0 from the bottom plate 50 to the storage case 30 is a distance L8, and the distance in the vertical direction D0 from the bottom plate 50 to the floor panel 6 is a distance L9.

[0136] The length of the main body 37H is longer than the distance L8. Therefore, even if the protective plate 32H rotates around the first bent portion 24H so as to approach the casing 30, the main body 37H comes into contact with any of the lower flange 57, the flange 78, and the flange 79, and is prevented from coming into contact with the connector 43. This prevents the connector 43 from being damaged.

[0137] 17, the length of the main body 37H is longer than the distance L9. Therefore, even if the protective plate 32H rotates around the first bent portion 24H so as to approach the accommodation case 30, the main body 37H will come into contact with the floor panel 6 before coming into contact with the accommodation case 30. This makes it possible to prevent damage to the accommodation case 30.

[0138] Tenth Embodiment A power storage device 1J and a vehicle 2J including the power storage device 1J according to a tenth embodiment will be described with reference to FIG. 18 and other figures.

[0139] Various fixing structures can be used to fix the electricity storage device to the vehicle frame 10. In this electricity storage device 1J, it is fixed between the left side rocker 4J and the right side rocker 5J.

[0140] Fig. 18 is a bottom view showing the bottom of a vehicle 2J. Fig. 19 is a cross-sectional view schematically showing a vehicle 2J and a power storage device 1J.

[0141] The vehicle 2J is an electric vehicle and includes a power storage device 1J, a drive motor and a PCU (not shown), and a vehicle frame 10J.

[0142] The vehicle framework 10J includes a left side rocker 4J, a right side rocker 5J, a left front side member 7J, a right front side member 8J, and a front panel 9J. A drive motor and a PCU are disposed above the front panel 9J. In the example shown in FIG. 18 , for example, the vehicle 2J does not include a floor panel. The power storage device 1J also functions as the floor panel, separating the vehicle interior space from the vehicle exterior space. In the example shown in FIG. 18 , the upper case of the storage case functions as the floor panel instead of the floor panel. However, the upper cover of the storage case may be omitted and the floor panel may function as the upper case. In this case, the opening of the lower case is blocked by the floor panel, and the electrical equipment 40, the power storage stack 42, and the like are housed in the space defined by the lower case and the floor panel.

[0143] 18 is fixed to a left side rocker 4J and a right side rocker 5J. The power storage device 1J includes a housing case 30J, fixing flanges 27A and 27B, and a protective plate 32J. The internal structure of the housing case 30J is configured similarly to that of the power storage device 1.

[0144] Therefore, the bottom plate 50J of the storage case 30J includes a bottom main body 50A and a reinforcing member 44J, and the bottom plate 50J is formed with a first portion P1 and a second portion P2.

[0145] The protective plate 32J includes a first connecting portion 36J, a main body portion 37J, and a second connecting portion 35J. The first connecting portion 36J is fixed to a reinforcing member 44J of the bottom plate 50J, and the second connecting portion 35J is connected to the front panel 9J.

[0146] In this way, the power storage device according to the present disclosure can be applied to electrically powered vehicles such as hybrid vehicles, plug-in hybrid vehicles, and electric vehicles.

[0147] In addition, in the present embodiment, the bottom plate 50 of the storage case 30 corresponds to the "fixed base material," but the "fixed base material" is not limited to the bottom plate 50. For example, the side wall of the storage case 30 may be used as the fixed base material, and the fixed base material is not limited to the bottom plate 50.

[0148] In addition, in this embodiment, the bottom plate 50 serving as the fixed base includes the bottom body 50A and the reinforcing member 44. However, for example, instead of the reinforcing member 44, a thick portion may be integrally formed on the bottom body 50A to form a reinforcing portion. Note that the reinforcing member 44 corresponds to the "reinforcing portion," but various configurations can be adopted for the reinforcing portion. For example, the reinforcing portion may be a rib extending in the front-to-rear direction L0 on the bottom body 50A, or a member with a high Young's modulus extending in the front-to-rear direction L0 may be disposed. In this case, the Young's modulus of the rib serving as the reinforcing portion is higher than the Young's modulus of the portion of the bottom body 50A where the rib is not provided.

[0149] In addition, in the present embodiment, the second bent portion 23 and the first bent portion 24 are formed in the protective plate 32, but such bent portions do not have to be formed in the protective plate 32. For example, the first connecting portion 36 and the second connecting portion 35 may be smoothly connected. Note that the vehicle frame 10 may include a member that is located above the partition member 47 and extends in the vehicle width direction W0.

[0150] Eleventh Embodiment An energy storage device 1K according to an eleventh embodiment will be described with reference to Fig. 20 and other figures. Fig. 20 is a plan view schematically showing lower case 39, reinforcing member 44, device fixing portions 53A, 53B, and device fixing portions 54A, 54B. Note that Fig. 20 does not show upper case 38 and other components.

[0151] The reinforcing member 44 is provided on the lower surface of the bottom body 50A of the lower case 39. The device fixing portions 53A, 53B and device fixing portions 54A, 54B are members for fixing the electric device 40 to the bottom body 50A.

[0152] 21 is a plan view schematically illustrating the distribution of bending rigidity. In the example illustrated in FIG. 21 , the first portion P1 is located on the bottom plate 50 closer to the front direction L1 than the rear edge 91 of the reinforcing member 44. The second portion P2 is located between the rear edge 91 and the vertical wall 61.

[0153] Here, in a plan view, the first portion P1 is located in the area where the reinforcing member 44 is located, and the device fixing portions 53A, 53B and device fixing portions 54A, 54B are provided in the first portion P1.

[0154] In this way, since all of the equipment fixing portions 53A, 53B and the equipment fixing portions 54A, 54B are fixed to the first part P1, even if an impact force is applied to the storage device 1K from the forward direction L1, the equipment fixing portions 53A, 53B and the equipment fixing portions 54A, 54B will be displaced together.

[0155] In particular, in the power storage device 1K, the device fixing portions 53A, 53B and the device fixing portions 54A, 54B are arranged at positions overlapping the reinforcing member 44 in a plan view.

[0156] This makes it easier for the device fixing portions 53A, 53B and the device fixing portions 54A, 54B to be displaced together when an impact force is applied to the power storage device 1K.

[0157] Twelfth Embodiment A power storage device 1L will be described with reference to Fig. 22 etc. Fig. 22 is a plan view schematically showing a lower case 39, a reinforcing member 44L, device fixing portions 53C, 53D, and device fixing portions 54C, 54D.

[0158] The reinforcing member 44L includes a plate portion 95, a plate portion 96, and a connecting portion 97. The plate portion 95 and the plate portion 96 are provided at an interval in the vehicle width direction W0, and the connecting portion 97 is formed to connect the plate portion 95 and the plate portion 96.

[0159] 23 is a plan view schematically illustrating the distribution of bending rigidity. In this energy storage device 1L, the first portion P1 is located in the region where the reinforcing member 44L is located. The second portion P2 is located on the rearward side (L2) of the first portion P1.

[0160] The device fixing portions 53C, 53D and the device fixing portions 54C, 54D are fixed to the first portion P1. Therefore, if an impact force is applied to the power storage device 1L from the front direction L1 side, the device fixing portions 53C, 53D and the device fixing portions 54C, 54D will be displaced integrally.

[0161] Thirteenth Embodiment A power storage device 1M will be described with reference to Fig. 24 etc. Fig. 24 is a plan view schematically showing lower case 39, reinforcing member 44, device fixing portions 53E, 53F and device fixing portions 54E, 54F.

[0162] The power storage device 1M further includes an inner reinforcing member 98 in addition to the configuration of the power storage device 1 of embodiment 1. The inner reinforcing member 98 is disposed inside the lower case 39 and fixed to the upper surface of the bottom body 50A.

[0163] The device fixing portions 53E, 53F and the device fixing portions 54E, 54F are fixed to an inner reinforcing member 98.

[0164] 25 is a plan view schematically illustrating the distribution of bending stiffness. In plan view, the first portion P1 is located in the area where the inner reinforcing member 98 and the reinforcing member 44 are located. The second portion P2 is located on the rearward direction L2 side of the first portion P1.

[0165] The device fixing portions 53E, 53F and the device fixing portions 54E, 54F are fixed to the first portion P1. Therefore, when an impact force is applied to the power storage device 1M from the forward direction L1, the device fixing portions 53E, 53F and the device fixing portions 54E, 54F are displaced integrally.

[0166] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present disclosure is defined by the scope of the claims, and it is intended to include all modifications within the meaning and scope of the claims.

[0167] REFERENCE SIGNS LIST 1, 1A, 1B, 1C, 1D, 1E, 1F, 1G, 1H, 1J Electricity storage device, 2, 2J Vehicle, 3, 10, 10J Body frame, 4, 4J Left side rocker, 5, 5J Right side rocker, 5G, 35, 35F, 35G, 35H, 35J Second connection portion, 6 Floor panel, 7, 7J Left front side member, 8, 8J Right front side member, 9 Suspension member, 9J Front panel, 11 Drive mechanism, 12 Exhaust pipe, 13 Storage space, 14 Vehicle interior space, 15 Engine, 16, 17 Motor generator, 19 Drive wheel, 20 Charging unit, 21 Fuel tank, 22 Heat insulating cover, 23, 23F, 23G, 23H Second bent portion, 24, 24F, 24G, 24H First bent portion, 24B Reinforcement plate, 25 Front end portion, 26: Rear end portion, 27A, 27B: Fixing flange, 29: Impact absorbing member, 30, 30J: Storage case, 31, 73, 73A: Fixing bracket, 32, 32A, 32B, 32F, 32G, 32H, 32J, 33: Protective plate, 34: Shear panel, 36, 36F, 36G, 36H, 36J: First connecting portion, 36A: Thick portion, 36B: Thin portion, 37, 37A, 37F, 37G, 37H, 37J: Main body portion, 38: Upper case, 39: Lower case, 40: Electrical equipment, 41A: Connection equipment, 41B: Control equipment, 42: Power storage stack, 43: Connector, 44, 44C, 44D, 44E, 44J: Reinforcing member, 46: Cooling device, 47: Partition member, 48 Partition wall, 50, 50D, 50E, 50J Bottom plate, 50A Bottom main body, 51 Peripheral wall, 52 Front wall, 53, 54 Equipment fixing portion, 55 Storage module, 57 Lower flange, 59 Main body, 60, 77 Top plate, 61, 62 Vertical wall, 63, 64, 78, 79 Flange, 65, 65A, 65B, 66 Fixing member, 67, 68 Welded portion, 69A, 69B Bulging portion, 70 Cooling main body, 71 Refrigerant flow portion.

Claims

1. An energy storage device comprising: a storage case; an energy storage stack accommodated in the storage case; an electric device accommodated within the storage case; and a connecting member provided on the storage case, wherein a direction from the energy storage stack towards the electric device is defined as a first direction and a direction opposite to the first direction is defined as a second direction, the storage case includes a fixing base material, the fixing base material includes a first portion and a second portion provided at a position adjacent to the first portion in the second direction and having a lower bending rigidity than the first portion, the electric device is fixed to the first portion, and the connecting member includes: a first connection portion connected to the first portion, a second connection portion located on the first direction side of the first connection portion and higher than the first connection portion, and connected to a vehicle, and a main body portion located between the first connection portion and the second connection portion, and the main body portion includes a portion extending upward as it moves from the first connection portion side to the second connection portion side.

2. The power storage device according to claim 1, wherein the first portion includes a reinforcing portion.

3. An electricity storage device comprising: a storage case; an electricity storage stack accommodated in the storage case; an electrical device accommodated within the storage case; and a connecting member provided on the storage case, wherein a first direction is a direction from the electricity storage stack towards the electrical device and a second direction is a direction opposite to the first direction, the storage case includes a fixing base material, the fixing base material includes a first portion and a second portion adjacent to the first portion in the second direction, the first portion includes a reinforcing portion, the electrical device is fixed to the first portion, and the connecting member includes a first connection portion fixed to the first portion, a second connection portion located in the first direction further than the first connection portion and higher than the first connection portion and fixed to a vehicle, and a main body portion located between the first connection portion and the second connection portion, and the main body portion includes a portion extending upward as it moves from the first connection portion side towards the second connection portion side.

4. The energy storage device according to claim 2 or 3, further comprising a first device fixing portion and a second device fixing portion for fixing the electrical device to the fixing base material of the storage case, wherein the first device fixing portion is located on the first direction side of the second device fixing portion, an end portion of the reinforcing portion located on the first direction side is located on the first direction side of the first device fixing portion, and an end portion of the reinforcing portion located on the second direction side is located on the second direction side of the second device fixing portion.

5. The energy storage device according to claim 4, wherein the storage case includes a lower case, the reinforcing portion includes an outer reinforcing member provided on the underside of the lower case, and when the lower case and the outer reinforcing member are viewed in a plane, the first equipment fixing portion and the second equipment fixing portion are provided in a portion where the outer reinforcing member is located.

6. The energy storage device of claim 4, wherein the storage case includes a lower case, the reinforcing portion includes an outer reinforcing member provided on the underside of the lower case and an inner reinforcing member provided on the upper surface of the lower case, and when the lower case, the outer reinforcing member, and the inner reinforcing member are viewed in a plane, the first equipment fixing portion and the second equipment fixing portion are provided in a portion where the outer reinforcing member and the inner reinforcing member are located.

7. The energy storage device according to claim 2 or 3, wherein the connecting member is fixed to the reinforcing portion.

8. The energy storage device according to claim 2 or claim 3, wherein the electrical equipment is fixed to an upper surface of the fixed base material, the connecting member is fixed to a lower surface of the fixed base material, and an overlapping portion of the connecting member that overlaps with the electrical equipment in the vertical direction has a bending rigidity higher than that of a portion adjacent to the overlapping portion in the first direction.

9. The energy storage device according to claim 2 or 3, wherein the connecting member includes a first bent portion formed by the first connection portion and the main body portion, and a second bent portion formed by the second connection portion and the main body portion, and the bending rigidity of the first bent portion is higher than the bending rigidity of the second bent portion.

10. The storage case includes a partition member that is provided on the fixed base material and is located on the second direction side of the second portion, the partition member including a partition body extending upward from the fixed base material, a first flange extending in the first direction from a lower end of the partition body, and a second flange extending in the second direction from a lower end of the partition body, and the second direction side end of the reinforcing portion is located below the first flange. The energy storage device described in claim 2 or claim 3.

11. The energy storage device according to claim 2 or 3, further comprising a connector connected to the electrical equipment and pulled out from the accommodating case in the first direction, wherein the connecting member includes a first bent portion formed by the first connection portion and the main body portion, and a second bent portion formed by the second connection portion and the main body portion, and the first bent portion is located on the first direction side of the connector.

12. The energy storage device of claim 2 or 3, wherein the storage case includes an upper case and a lower case located below the upper case, the lower case includes the fixed base material, a peripheral wall portion extending upward from the fixed base material, and a case flange formed on an upper end of the peripheral wall portion, and an end portion of the reinforcing portion located in the first direction is located on the first direction side of the case flange.

13. The energy storage device according to claim 2 or 3, wherein the storage case further comprises a partition wall extending upward from the fixed base material side, the partition wall being formed so as to extend upward beyond the electrical device.

14. The energy storage device as described in claim 13, wherein the storage case includes an upper case and a lower case located below the upper case, the lower case includes the fixed base material and a peripheral wall portion extending upward from the fixed base material, and the partition wall is connected to the peripheral wall portion.

15. The energy storage device described in claim 2 or claim 3, wherein the reinforcing portion includes a first reinforcing end portion located on the first direction side and a second reinforcing end portion located on the second direction side, and the bending rigidity of the second reinforcing end portion is higher than the bending rigidity of the first reinforcing end portion.

16. The energy storage device of claim 2 or 3, wherein the reinforcing portion includes a first reinforcing end portion located on the first direction side and a second reinforcing end portion located on the second direction side, and the bending rigidity of the reinforcing portion increases from the second reinforcing end portion toward the first reinforcing end portion.

17. The energy storage device according to claim 2 or 3, wherein the connecting member includes a first connecting end located on the first direction side and a second connecting end located on the second direction side, and the bending rigidity increases from the second connecting end side toward the first connecting end side.

18. The energy storage device according to claim 2 or 3, wherein the connecting member includes a first connecting end located on the first direction side and a second connecting end located on the second direction side, and at least a portion of the connecting member is formed with a portion whose bending rigidity increases going from the second connecting end side toward the first connecting end side.

19. The energy storage device according to claim 2 or 3, further comprising a connector connected to the electrical device and pulled out from the accommodating case in the first direction, wherein the accommodating case includes an upper case and a lower case located below the upper case, wherein the lower case includes the fixed base material, a peripheral wall portion extending upward from the fixed base material, and a case flange formed at an upper end of the peripheral wall portion and projecting in the first direction, wherein the connecting member includes a first bent portion formed by the first connection portion and the main body portion, and a second bent portion formed by the second connection portion and the main body portion, and wherein the length of the main body portion is longer than the vertical length of the case flange and the fixed base material.

20. A vehicle equipped with the storage device according to claim 2 or 3, the vehicle including a floor panel, the storage device being arranged below the floor panel, the connecting member including a first bent portion formed by the first connection portion and the main body portion, and a second bent portion formed by the second connection portion and the main body portion, and the length of the main body portion is longer than the vertical length of the floor panel and the fixed base material.

21. A vehicle comprising: a vehicle frame; and an electric storage device arranged on a bottom of the vehicle frame, the electric storage device comprising: a storage case; a power storage stack accommodated in the storage case; an electric device accommodated within the storage case; and a connecting member provided on the storage case, wherein a direction from the power storage stack toward the electric device is defined as a first direction and a direction opposite to the first direction is defined as a second direction; the storage case includes a fixing base material, the fixing base material including: a first portion; and a second portion provided at a position adjacent to the first portion in the second direction and having a bending rigidity lower than that of the first portion, the electric device is fixed to the first portion, and the connecting member includes: a first connection portion connected to the first portion, a second connection portion located on the first direction side of the first connection portion and higher than the first connection portion, the second connection portion being connected to the vehicle, and a main body portion located between the first connection portion and the second connection portion, The main body portion includes a portion that extends upward from the first connection portion toward the second connection portion.

22. The vehicle of claim 21, wherein the first portion includes a reinforcement portion.

23. A vehicle comprising: a vehicle frame; and an electric storage device arranged on a bottom of the vehicle frame, the electric storage device comprising: a storage case; a power storage stack accommodated in the storage case; an electric device accommodated within the storage case; and a connecting member provided on the storage case, wherein a direction from the power storage stack toward the electric device is defined as a first direction, and a direction opposite to the first direction is defined as a second direction; the storage case includes a fixing base material, the fixing base material including: a first portion and a second portion adjacent to the first portion in the second direction, the first portion including a reinforcing portion, the electric device being fixed to the first portion, and the connecting member including: a first connection portion fixed to the first portion, a second connection portion located forward of the vehicle relative to the first connection portion and higher than the first connection portion, and fixed to the vehicle, and a main body portion located between the first connection portion and the second connection portion, The main body portion includes a portion that extends upward from the first connection portion toward the second connection portion.

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