Electricity storage device and vehicle

Abstract

The utility model relates to an electrical storage device and a vehicle. A power storage device is provided with a first power storage module, a second power storage module disposed above the first power storage module, a housing case for housing the first power storage module and the second power storage module, and a support member disposed between the first power storage module and the second power storage module in the vertical direction, the lower side of the second power storage module being fixed to the upper surface side of the support member. The upper side of the first power storage module is fixed to the lower surface side of the support member, and the support member is fixed to the housing case.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to an electrical storage device and a vehicle. BACKGROUND

[0002] As a conventional electrical storage device, in Japanese Patent Application Publication No. 2020-061380, a configuration is disclosed in which battery modules (electrical storage modules) are respectively arranged in an upper side housing, an intermediate housing, and a lower side housing, and the various housings are stacked in a vertical direction (up (UP) and down (Down)). SUMMARY

[0003] However, in the configuration disclosed in Japanese Patent Application Publication No. 2020-061380, a plurality of housings are manufactured, electrical storage modules are provided in each of the housings, and the housings are fastened and joined to each other, and thus, labor and cost for manufacturing are consumed. In order to eliminate such complexity, it is conceivable to stack a plurality of electrical storage modules in the vertical direction and house the plurality of electrical storage modules in one housing, but the housing becomes large. Therefore, without taking any measures, there is a concern that the housing easily deforms.

[0004] The present disclosure is made in view of the above-described problems, and an object of the present disclosure is to provide an electrical storage device capable of improving the rigidity of a housing that houses a plurality of electrical storage modules arranged in a vertical direction and a vehicle provided with the electrical storage device.

[0005] The electrical storage device based on the present disclosure is provided with a first electrical storage module, a second electrical storage module arranged above the first electrical storage module, a housing that houses the first electrical storage module and the second electrical storage module, and a support member arranged between the first electrical storage module and the second electrical storage module in a vertical direction. A lower side of the second electrical storage module is fixed to an upper surface side of the support member. An upper side of the first electrical storage module is fixed to a lower surface side of the support member. The support member is fixed to the housing.

[0006] According to the above-described configuration, by fixing the support member in which the first electrical storage module and the second electrical storage module arranged in the vertical direction are fixed, to the housing, the rigidity of the housing can be improved.

[0007] In the electrical storage device based on the above-described present disclosure, a fixed portion that is fixed to the housing can be provided in the support member. The housing can include an upper housing. In this case, the fixed portion can be fixed to the upper housing.

[0008] According to the above-described configuration, by fixing the fixed portion to the upper housing, the rigidity of the upper housing can be improved.

[0009] In the power storage device based on the above disclosure, the upper case can include a first wall portion facing the second power storage module from a front side in a front-rear direction orthogonal to the up-down direction and a second wall portion facing the second power storage module from a rear side in the front-rear direction. The support member can be fixed to each of the first wall portion and the second wall portion.

[0010] According to the above configuration, the support member is fixed to the first wall portion and the second wall portion of the upper case at two positions of the front and the rear, and thus the rigidity of the upper case can be further improved.

[0011] In the power storage device based on the above disclosure, the first power storage module and the second power storage module can each include a front end portion and a rear end portion in a front-rear direction orthogonal to the up-down direction. The rear end portion of the second power storage module can be positioned more forward than the rear end portion of the first power storage module.

[0012] According to the above configuration, in molding the upper case, there is a case where an inclination that goes toward the inside as it goes upward is formed in the rear wall portion of the upper case facing the rear end portion of the first power storage module and the rear end portion of the second power storage module due to a draft angle (draft slope) or the like. In such a case, by fixing the second power storage module to the support member in such a manner that the rear end portion of the second power storage module is positioned more forward than the rear end portion of the first power storage module, the gap between the power storage stack positioned at the lowermost layer among the plurality of power storage stacks constituting the first power storage module and the rear wall portion of the upper case can be reduced. Thus, the dead space in the accommodation case can be reduced, and the plurality of power storage stacks can be arranged in the accommodation case at a high density.

[0013] The vehicle based on the disclosure is provided with the power storage device, a vehicle frame member, and a link member for linking the accommodation case and the vehicle frame member. The link member is fixed to the portion of the support member fixed to the accommodation case.

[0014] According to the above configuration, by linking the portion of the support member on which the first power storage module and the second power storage module arranged in the up-down direction are fixed to the accommodation case and the vehicle frame member, the rigidity of the accommodation case and the rigidity of the vehicle frame member can be improved.

[0015] The above and other objects, features, aspects and advantages of the present application will become more apparent from the following detailed description of the present application when taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a schematic view of the vehicle of Embodiment 1.

[0017] Figure 2 is a schematic view of the power storage device of Embodiment 1.

[0018] Figure 3 is a perspective view of the support member of Embodiment 1.

[0019] Figure 4 is a sectional view showing a state in which the support member of Embodiment 1 is fixed to the housing case.

[0020] Figure 5 is a plan view showing a state in which the power storage device is fixed to the frame member of the vehicle of Embodiment 1.

[0021] Figure 6 is a perspective view showing a state in which the power storage device of Embodiment 1 is fixed to the frame member by the connecting member.

[0022] Figure 7 is a sectional view showing a state in which the support member of Embodiment 2 is fixed to the housing case.

[0023] Figure 8 is a schematic view of the power storage device of Embodiment 3. DETAILED DESCRIPTION

[0024] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. Furthermore, in the embodiments shown below, with respect to the same or common portions, the same reference numerals are attached to the same portions in the drawings, and the description thereof will not be repeated.

[0025] (Embodiment 1)

[0026] Figure 1 is a schematic view of the vehicle of Embodiment 1. With reference to Figure 1 The vehicle 1 of Embodiment 1 will be described.

[0027] The vehicle 1 of Embodiment 1 is a hybrid vehicle capable of traveling using power of at least one of a motor and an engine, or an electric vehicle that travels using driving force obtained by electric energy.

[0028] As shown in Figure 1 , the vehicle 1 is provided with a front seat 2, a rear seat 3, a floor panel 4, and a power storage device 10. The power storage device 10 is configured by electrically connecting a plurality of power storage modules described later in series. Thereby, the power storage device 10 is capable of supplying electric power to a motor with high output. The power storage device 10 can be configured as a whole under the floor panel 4.

[0029] Figure 2 is a schematic view of the power storage device of Embodiment 1. With reference to Figure 2 The power storage device 10 will be described in detail.

[0030] The electrical storage device 10 is disposed between the electric drive mechanisms 80 that are disposed at intervals in the front-rear direction of the vehicle 1. The electric drive mechanism 80 is, for example, an eAxle that is capable of directly supplying electric power to the axle of the vehicle.

[0031] The electrical storage device 10 includes a plurality of electrical storage modules, a housing 20, a support member 30, and a plurality of electronic devices 71, 72, 73. The electronic devices 71, 72, 73 are, for example, junction boxes, a battery ECU, a BMS (Battery Management System), and the like.

[0032] The plurality of electrical storage modules includes a front-side module 11, a center-side module 12, and a rear-side module 13. The front-side module 11, the center-side module 12, and the rear-side module 13 are disposed in this order from the front toward the rear of the vehicle.

[0033] The front-side module 11 is configured, for example, by arranging and disposing electrical storage stacks that extend in the width direction of the vehicle in the front-rear direction. The electronic devices 71, 72 are disposed above the front-side module 11.

[0034] The center-side module 12 is located between the front-side module 11 and the rear-side module 13. The center-side module 12 is configured by arranging and disposing electrical storage stacks that extend in the front-rear direction in the up-down direction by stacking. More specifically, two electrical storage stacks are arranged and disposed in the front-rear direction, and other electrical storage stacks are stacked in each of the electrical storage stacks.

[0035] The rear-side module 13 includes a first electrical storage module 14 and a second electrical storage module 15. The first electrical storage module 14 and the second electrical storage module 15 are arranged and disposed in the up-down direction. The first electrical storage module 14 and the second electrical storage module 15 are configured by arranging and disposing electrical storage stacks that extend in the width direction of the vehicle 1 in a row-column shape (matrix shape).

[0036] The electrical storage stacks included in the front-side module 11, the center-side module 12, and the rear-side module 13 are configured by arranging a plurality of electrical storage units 18 in a predetermined direction. The electrical storage unit 18 is, for example, a secondary battery such as a nickel-hydrogen battery or a lithium-ion battery. The electrical storage unit 18 can have a square shape. The electrical storage unit 18 can use a liquid electrolyte or a solid electrolyte. In addition, the electrical storage unit 18 can be a capacitor that is capable of charging and discharging.

[0037] The second electrical storage module 15 is disposed above the first electrical storage module 14. The height of the second electrical storage module 15 is, for example, higher than that of the first electrical storage module 14. The length of the second electrical storage module 15 in the front-rear direction is shorter than that of the first electrical storage module 14.

[0038] The first electric storage module 14 has a front end portion 14a and a rear end portion 14b in the front-rear direction. The second electric storage module 15 has a front end portion 15a and a rear end portion 15b in the front-rear direction.

[0039] The rear end portion 15b of the second electric storage module 15 is located at a position further forward than the rear end portion 14b of the first electric storage module 14. The front end portion 15a of the second electric storage module 15 is located at a position further rearward than the front end portion 14a of the first electric storage module 14. An electronic device 73 is disposed on the front side of the lower portion of the second electric storage module 15.

[0040] The accommodation case 20 accommodates the plurality of electric storage modules (the front side module 11, the center side module 12, and the rear side module 13), the support member 30, and the plurality of electronic devices 71, 72, and 73.

[0041] The accommodation case 20 includes a lower case 21 and an upper case 22. The lower case 21 has, for example, a plate-like shape. Further, the shape of the lower case 21 is not limited to a plate shape, and can be a substantially box shape that is open toward the upper side. In this case, a flange portion can be provided at the upper end portion of the lower case 21. The lower case 21 is composed of, for example, a metal material such as SUS.

[0042] The upper case 22 is provided in a manner of covering the lower case 21. The upper case 22 has a substantially box shape that is open toward the lower side. A flange portion is provided at the lower end of the upper case 22, and the flange portion is fixed to the peripheral portion of the lower case 21. Further, in the case where the flange portion is provided at the lower case 21 as described above, the flange portion of the upper case 22 and the flange portion of the lower case 21 can be fastened and joined by a fastening and joining member.

[0043] The upper case 22 can be composed of a resin material from the viewpoint of weight reduction. The upper case 22 can also be composed of a metal material such as aluminum or SUS. The rigidity of the upper case 22 can be smaller than the rigidity of the lower case 21.

[0044] The upper case 22 has a front wall portion 221, a rear wall portion 222, and a top wall portion 223. The front wall portion 221 is located in front of the front side module 11. The front wall portion 221 can be inclined in a manner of going toward the rear side as it goes toward the upper side due to a draft angle or the like at the time of molding.

[0045] The rear wall portion 222 is located behind the rear side module 13. The rear wall portion 222 functions as a second wall portion that faces the second electric storage module 15 from the rear side. More specifically, the rear wall portion 222 faces the first electric storage module 14 and the second electric storage module 15 from the rear side.

[0046] The rear wall portion 222 can be inclined in such a manner that it goes forward as it goes upward due to a draft angle or the like at the time of molding. In this case, by fixing the second power storage module 15 to the support member 30 in such a manner that the rear end portion 15b of the second power storage module 15 is located at a position that is more forward than the rear end portion 14b of the first power storage module 14, it is possible to reduce the gap between the power storage stack located at the lowermost position among the plurality of power storage stacks that make up the first power storage module 14 and the rear wall portion 222. As a result, it is possible to reduce the dead space within the accommodation case 20 and arrange the plurality of power storage stacks at a high density within the accommodation case. In particular, in the case where the power storage device 10 is arranged as described above between the two electric drive mechanisms 80, the installation space is limited, and therefore it is possible to more effectively arrange the power storage stacks at a high density.

[0047] The top wall portion 223 connects the front wall portion 221 and the rear wall portion 222. The top wall portion 223 has a concave-convex shape that corresponds to the heights of the front-side module 11 and the electronic devices 71, 72, the center-side module 12, and the electronic device 73 and the rear-side module 13.

[0048] Specifically, the top wall portion 223 includes a front portion 224, a center portion 225, and a rear portion 226. The front portion 224, the center portion 225, and the rear portion 226 are arranged in this order in the direction from the front toward the rear.

[0049] The front portion 224 is arranged above the front-side module 11 and the electronic devices 71, 72. The height position of the front portion 224 is located at a position that is higher than that of the center portion 225. A step portion 215a is formed between the front portion 224 and the center portion 225.

[0050] The center portion 225 is arranged above the center-side module 12. The center portion 225 is located at a position that is lower than the front portion 224 and the rear portion 226.

[0051] The rear portion 226 has a first rear portion 227 and a second rear portion 228. The first rear portion 227 is located above the electronic device 73. The height position of the first rear portion 227 is located at a position that is higher than that of the center portion 225. A step portion 225b is formed between the first rear portion 227 and the center portion 225.

[0052] The second rear portion 228 is located at a position that is more rearward than the first rear portion 227. The second rear portion 228 is located above the second power storage module 15. The height position of the second rear portion 228 is located at a position that is higher than that of the first rear portion 227. A step portion 229 is formed between the second rear portion 228 and the first rear portion 227. Furthermore, the height position of the second rear portion 228 is located at a position that is higher than that of the front portion 224.

[0053] The step portion 225b, the first rear portion 227, and the step portion 229 in the top wall portion 223 function as a first wall portion that faces the second power storage module 15 from the front.

[0054] The support member 30 is disposed between the first power storage module 14 and the second power storage module 15 in the up-and-down direction. On the upper surface 30a (see Figure 3 ) side of the support member 30, the lower side of the second power storage module 15 is fixed. On the lower surface 30b (see Figure 3 ) side of the support member 30, the upper side of the first power storage module 14 is fixed. The support member 30 is fixed to the housing case 20 as described later.

[0055] Figure 3 is a perspective view of the support member of Embodiment 1. Figure 4 is a sectional view showing a state in which the support member of Embodiment 1 is fixed to the housing case. The detailed description of the support member 30 is given with reference to Figure 3 and Figure 4 .

[0056] The support member 30 has a plate-shaped portion 31. The plate-shaped portion 31 is provided with a fixed portion 32, a plurality of module mounting portions 33, 34. The upper surface of the plate-shaped portion 31 constitutes the upper surface 30a of the support member 30, and the lower surface of the plate-shaped portion 31 constitutes the lower surface 30b of the support member 30.

[0057] The plate-shaped portion 31 has a first end portion 31a and a second end portion 31b. The first end portion 31a is the front end of the plate-shaped portion 31, and the second end portion 31b is the rear end of the plate-shaped portion 31.

[0058] The fixed portion 32 is fixed to the second end portion 31b. The fixed portion 32 is provided with two. The two fixed portions 32 are respectively provided on one side and the other side in the width direction of the vehicle. In addition, the number of the fixed portions 32 is not limited to two, and can be a single, and can be three or more. In addition, in the case where the fixed portions 32 are two, the power storage device 10 can be efficiently fixed to the pair of rear side members 51 (see Figure 5 ) by the fixed portions 32 and the connecting member 60 (see Figure 5 ) as described later.

[0059] The fixed portion 32 includes a portion 32c that extends along the rear wall portion 222. The portion 32c faces the rear wall portion 222, and is fixed to the rear wall portion 222 by the fastening connecting member 40. The insertion portion 41 for fixing the connecting member 60 described later is provided in the fastening connecting member 40.

[0060] A plurality of module mounting portions 33 are provided on the upper surface 30a of the support member 30. The lower side of the second power storage module 15 is fastening- and-joining-fixed to the plurality of module mounting portions 33. A plurality of module mounting portions 34 are provided on the lower surface 30b of the support member 30. The upper side of the first power storage module 14 is fastening- and-joining-fixed to the plurality of module mounting portions 34.

[0061] As described above, in the power storage device 10 of Embodiment 1, by fixing the support member 30 in which the first power storage module 14 and the second power storage module 15 configured in the up-and-down direction are fixed to the housing case 20, it is possible to improve the rigidity of the housing case 20.

[0062] Further, by fixing the fixed portion 32 to the upper case 22, it is possible to improve the rigidity of the upper case 22. In the case where the upper case 22 is configured of a member such as a resin member whose rigidity is lower than that of a metal member, it is possible to more effectively improve the rigidity of the upper case 22.

[0063] Figure 5 is a plan view showing a state in which the power storage device is fixed to a skeletal member of a vehicle of Embodiment 1.

[0064] As shown in Figure 5 , the vehicle 1 is provided with a vehicle skeletal member 50 and a plurality of connecting members 60. The vehicle skeletal member 50 includes, for example, a pair of side sills and a plurality of cross members. The pair of side sills includes a pair of front side sills (not shown), a pair of rear side sills 51, and a pair of connecting portions 53 that connect the pair of front side sills and the pair of rear side sills 51.

[0065] The pair of front side sills, the pair of connecting portions 53, and the pair of rear side sills 51 are arranged in this order from the front side of the vehicle 1 toward the rear side along the front-and-rear direction of the vehicle 1. The pair of front side sills, the pair of connecting portions 53, and the pair of rear side sills 51 are arranged separately in the width direction of the vehicle 1.

[0066] A rear end panel 56 is provided on the rear end side of the pair of rear side sills 51. The rear end panel 56 constitutes the rear portion of the vehicle 1. In addition, a cross member 55 is arranged in front of the rear end panel 56. The cross member 55 is provided in a manner of connecting the pair of rear side sills 51 and extends along the width direction of the vehicle 1. The cross member 55 is arranged at the rear of the power storage device 10.

[0067] The rear wall portion 222 of the housing case 20 is located between the pair of rear side sills 51 or between the pair of connecting portions 53 described above.

[0068] The housing 20 is coupled to the vehicle frame member 50 by a plurality of coupling members 60. Specifically, the housing 20 is fixedly coupled to a pair of rear side members 51 by two coupling members 60. More specifically, the housing 20 is fixed to the rear side member 51 at a position on one side in the width direction by the coupling member 60 disposed at the one side in the width direction, and is fixed to the rear side member 51 at a position on the other side in the width direction by the coupling member 60 disposed at the other side in the width direction.

[0069] Figure 6 is an enlarged perspective view of the state in which the power storage device of Embodiment 1 is fixed to the frame member by the coupling member.

[0070] As shown in Figure 6 , the coupling member 60 includes a first member 61, a second member 62, a first fastening coupling member 65, and a second fastening coupling member 66.

[0071] The first member 61 includes a first portion 611, a second portion 612, and a reinforcing portion 613. The first portion 611 is provided in a manner along the rear wall portion 222 of the housing 20. The first portion 611 has a plate-like shape and abuts against the rear wall portion 222. The second portion 612 is provided in a manner intersecting the first portion 611. The second portion 612 protrudes toward the rear from the first portion 611. The second portion 612 has a plate-like shape. The reinforcing portion 613 connects the first portion 611 and the second portion 612. Specifically, the reinforcing portion 613 connects the end portions of the first portion 611 and the second portion 612 to each other on the side opposite to the side on which the nearest rear side member 51 is located.

[0072] The first member 61 is fixed to the housing 20 by the first fastening coupling member 65. Specifically, the first member 61 is fixed to the rear wall portion 222 and the fixed portion 32 by the first fastening coupling member 65 penetrating the first portion 611 and being inserted into the insertion portion 41 described above. That is, the first member 61 is fixed to the portion of the support member 30 to which the housing 20 is fixed.

[0073] The second member 62 includes a first sheet portion 621 and a second sheet portion 622. The first sheet portion 621 has, for example, a plate-like shape. The first sheet portion 621 is disposed on the first portion 611 and is fixed to the first portion 611 by the second fastening coupling member 66. The end portion of the first sheet portion 621 on the side on which the nearest rear side member 51 is located is fixed to the side surface of the rear side member 51 by welding or the like.

[0074] The second piece portion 622 is provided in a manner that protrudes in the up-down direction from both end portions of the first piece portion 621 in the front-rear direction. The second piece portion 622 has a shape that goes upward as it goes toward the nearest rear side frame 51. The end portion of the second piece portion 622 on the side of the nearest rear side frame 51 is fixed to the side surface of the rear side frame 51 by welding or the like.

[0075] By fixing the second member 62 fixed to the rear side frame 51 to the first member 61 in the state where the first member 61 is fixed to the housing case 20 as described above, the housing case 20 and the vehicle frame member 50 are joined by the connecting member 60.

[0076] At this time, by fixing the first member 61 to the portion of the support member 30 fixed to the housing case 20 as described above, it is possible to effectively improve the rigidity of the housing case 20 and the rigidity of the vehicle frame member 50.

[0077] (Embodiment 2)

[0078] Figure 7 is a cross-sectional view showing the state where the support member of Embodiment 2 is fixed to the housing case. Refer to Figure 7 The power storage device 10A of Embodiment 2 will be described.

[0079] As shown in Figure 7 , the power storage device 10A of Embodiment 2 is different from the power storage device 10 of Embodiment 1 in that the fixing portion 32 is not provided and the support member 30 is directly fixed to the housing case 20. Specifically, the second end portion 31b of the plate-shaped portion 31 is fixed to the rear wall portion 222 of the upper case 22 by the fastening connecting member 40.

[0080] Even in this configuration, the power storage device 10A of Embodiment 2 functions substantially the same as the power storage device 10 of Embodiment 1.

[0081] (Embodiment 3)

[0082] Figure 8 is a schematic view of the power storage device of Embodiment 3. Refer to Figure 8 The power storage device 10B of Embodiment 3 will be described.

[0083] As shown in Figure 8 , the power storage device 10B of Embodiment 3 is different from the power storage device 10 of Embodiment 1 in the fixing method of the support member 30. The other configurations are substantially the same.

[0084] In the power storage device 10B of Embodiment 3, the support member 30 is fixed to the first wall portion composed of the stepped portion 225b, the first rear portion 227, and the stepped portion 229, and the rear wall portion 222 as the second wall portion.

[0085] Specifically, a fixed portion 39 (second fixed portion) is provided on the first end portion 31a side and is fixed to the first wall portion. Also, as with Embodiment 1, the fixed portion 32 (first fixed portion) provided on the second end portion 31b side is fixed to the rear wall portion 222.

[0086] Even in this configuration, the power storage device 10B of Embodiment 3 functions substantially the same as the power storage device 10 of Embodiment 1. In addition, as described above, the support member 30 is fixed to the first and second wall portions of the upper case 22 at two locations, the front and the rear, and thus the rigidity of the upper case 22 can be further improved. Further, the first end portion 31a can be directly fixed to the first wall portion.

[0087] The embodiments of the present application have been described, but it should be considered that the disclosed embodiments are illustrative and not restrictive in all aspects. The scope of the present application is indicated by the claims, and is intended to include equivalent meanings and ranges within the claims.

Claims

1. An electric storage device comprising: a first electric storage module; a second electric storage module disposed above the first electric storage module; a housing that houses the first electric storage module and the second electric storage module; and a support member disposed between the first electric storage module and the second electric storage module in a vertical direction, a lower side of the second electric storage module is fixed to an upper surface side of the support member, an upper side of the first electric storage module is fixed to a lower surface side of the support member, and the support member is fixed to the housing.

2. The electric storage device according to claim 1, wherein a fixed portion that is fixed to the housing is provided in the support member.

3. The electric storage device according to claim 2, wherein the upper housing includes a first wall portion that faces the second electric storage module from a front side and a second wall portion that faces the second electric storage module from a rear side in a front-rear direction that is orthogonal to the vertical direction, and the support member is fixed to each of the first wall portion and the second wall portion.

4. The electric storage device according to claim 1, wherein the first electric storage module and the second electric storage module each include a front end portion and a rear end portion in the front-rear direction that is orthogonal to the vertical direction, and the rear end portion of the second electric storage module is located at a position that is closer to the front side than the rear end portion of the first electric storage module.

5. A vehicle comprising: the electric storage device according to any one of claims 1 to 4; a vehicle frame member; and a connecting member for connecting the housing and the vehicle frame member, wherein the connecting member is fixed to a portion of the support member that is fixed to the housing. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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