Power storage device and vehicle

Abstract

To provide a power storage device capable of suppressing interference between an electric connection member and a power storage stack when a load is input from the outside while suppressing vibration of an electric member.SOLUTION: The power storage device 10 includes a first power storage stack 21 and a second power storage stack 22 including a plurality of power storage cells 25, a lower case, a cross member 40 partitioning a region in the lower case, an electrical connection member 66 including an extension portion 662 extending along the cross member 40, and a first protective member 50 and a second protective member 70 protecting the electrical connection member 66. The first protective member 50 includes a bottom portion 53 and a pair of wall portions 51 and 52, and is fixed to the upper wall 43 of the cross member 40, the extending portion 631 passes between the pair of wall portions 51 and 52, the second protective member 70 includes a covering portion 71 that covers the extending portion 631 between the pair of wall portions 51 and 52, and is held by the first protective member 50 in a state of being in contact with upper ends of the pair of wall portions 51 and 52.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present disclosure relates to a power storage device and a vehicle equipped with the power storage device. [Background technology]

[0002] As a conventional energy storage device, Patent Publication No. 2023-046945 (Patent Document 1) discloses a configuration in which a cross member is arranged between adjacent battery modules within a storage case that houses multiple battery modules (energy storage stacks), and a mounting member that supports an upper case is provided on the cross member.

[0003] A damper is placed between the body and the part of the upper case located above the mount member, so that when a load is applied from below the housing case, it is applied to the body through the cross member and the mount member. In this case, the load applied to the body can be reduced by absorbing part of the load with the damper placed in the input path from the upper case to the body. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2023-046945 Summary of the Invention [Problem to be solved by the invention]

[0005] The plurality of power storage stacks housed in the housing case are electrically connected by electrical connection members. When a load is applied from outside the housing case, the electrical connection members may interfere with the power storage stacks.

[0006] The present disclosure has been made in consideration of the above-mentioned problems, and an object of the present disclosure is to provide an energy storage device and a vehicle equipped with the energy storage device that can suppress interference between an electrical connection member and an energy storage stack when an external load is input while suppressing vibration of electrical components. [Means for solving the problem]

[0007] An energy storage device according to the present disclosure includes a first energy storage stack and a second energy storage stack each including a plurality of energy storage cells, a lower case in which the first energy storage stack and the second energy storage stack are disposed, a cross member disposed between the first energy storage stack and the second energy storage stack and partitioning an area within the lower case, an electrical connection member electrically connecting the first energy storage stack and the second energy storage stack and including an extension portion extending above the cross member and along the cross member, and first and second protective members protecting the electrical connection member. The first protective member includes a bottom portion and a pair of wall portions facing each other in a direction intersecting an extension direction of the extension portion and connected to the bottom portion, and is fixed to an upper wall of the cross member. The extension portion passes between the pair of wall portions. The second protective member includes a covering portion covering the extension portion between the pair of wall portions and is held by the first protective member in a state in contact with upper ends of the pair of wall portions.

[0008] According to the above configuration, the rigidity of the lower case is increased in the region where the cross member is fixed. Therefore, when an external impact is applied to the lower case, deformation around the cross member is suppressed. This prevents external force from being applied to the extension portion of the electrical connection member that extends above and along the cross member. This suppresses deformation of the electrical connection member and suppresses interference between the electrical connection member and the power storage stack. Furthermore, because the extension portion passes between the pair of wall portions of the first protective member, interference between the extension portion and the power storage stack is further suppressed. Additionally, because the second protective member held by the first protective member has a covering portion that covers the extension portion of the electrical connection member, vibrations and shocks applied to the electrical connection member can be suppressed.

[0009] The power storage device according to the present disclosure includes an upper member that closes the lower case and covers the first power storage stack and the second power storage stack from above. In this case, an upper surface of the second protection member may be in contact with the upper member, and a gap may be provided between a lower end of the covering portion and the bottom.

[0010] According to the above configuration, a gap is formed between the bottom of the first protective member and the covering portion that covers the extending portion of the electrical connection member, so that a load from the upper member side is transmitted to the cross member through the pair of walls of the first protective member, thereby preventing the load from being transmitted to the extending portion covered by the covering portion.

[0011] In the energy storage device according to the present disclosure, the upper surfaces of the pair of wall portions may be flat. The second protective member may have the upper surface of the second protective member and include an upper end portion that has the upper surface of the second protective member and extends in the intersecting direction above the covering portion. The upper end portion may have a protruding portion that protrudes from the covering portion in the intersecting direction when viewed from below. In this case, the protruding portion may contact an end of the upper surfaces of the pair of wall portions that is located on the inner side in the intersecting direction and have an inclined portion that slopes upward as it extends toward the outer side in the intersecting direction.

[0012] According to the above configuration, the inclined portion is provided on the protruding portion of the second protective member, so that when a load is applied from above the upper member, the pair of walls of the first protective member deform so as to move away from each other. In addition to this deformation, a gap is formed between the lower end of the second protective member and the bottom of the first protective member, which further reduces the load applied to the electrical connection member.

[0013] A vehicle according to the present disclosure includes a vehicle body and the above-described power storage device mounted on the vehicle body.

[0014] According to the above configuration, by including the above-described power storage device, it is possible to suppress vibration of the electrical connection members, while suppressing interference between the electrical connection members and the power storage stack, and to suppress short-circuiting of the power storage stack.

[0015] In the vehicle according to the present disclosure, the vehicle body may include a floor panel, and the power storage device may be disposed below the floor panel. In this case, the vehicle may further include a buffer member disposed in a gap between the floor panel and the power storage device. The buffer member may be disposed above the first protective member and the second protective member.

[0016] According to the above configuration, when an external impact is applied to the electric storage device, the shock absorber can reduce the external force transmitted to the floor panel. Furthermore, when the electric storage device is mounted on the vehicle body, the shock absorber can be pressed against the shock absorber, which allows the first protective member and the second protective member to be pressed against the cross member by a reaction force. This suppresses vibration of the first protective member and the second protective member, and ultimately suppresses vibration of the electrical connection members covered by the second protective member.

[0017] In the vehicle based on the present disclosure, the vehicle body includes a frame member. The power storage device includes an upper member that closes the lower case and covers the first power storage stack and the second power storage stack from above. In this case, the vehicle may further include a buffer member disposed in a gap between the upper member and the vehicle frame member. The buffer member may be disposed above the first protective member and the second protective member.

[0018] According to the above configuration, when an external impact is applied to the electric storage device, the shock absorber can reduce the external force transmitted to the vehicle frame members. Furthermore, when the electric storage device is mounted on the vehicle body, the electric storage device is mounted so as to be pressed against the shock absorber, and the reaction force can press the first protective member and the second protective member against the cross member. This suppresses vibration of the first protective member and the second protective member, and ultimately suppresses vibration of the electrical connection members covered by the second protective member.

[0019] In the vehicle according to the present disclosure, the power storage device includes an upper member that closes the lower case and covers the first power storage stack and the second power storage stack from above. In this case, the vehicle may further include a protective cover that covers a portion of the upper member from above so as to form a space between the upper member and the protective cover. The protective cover may have a pair of side wall portions that are spaced apart from each other in the extension direction of the cross member. The first protective member and the second protective member may be disposed below the lower surfaces of the pair of side wall portions, respectively.

[0020] According to the above configuration, the load from the protective cover can press the first and second protective members toward the cross member via the upper member, thereby suppressing vibration of the first and second protective members and, ultimately, vibration of the electrical connection members covered by the second protective member. [Effects of the Invention]

[0021] According to the present disclosure, it is possible to provide an energy storage device and a vehicle equipped with the energy storage device that can suppress interference between an electrical connection member and an energy storage stack when an external load is input while suppressing vibration of electrical components. [Brief explanation of the drawings]

[0022] [Figure 1] 1 is a schematic diagram of a vehicle according to a first embodiment. [Figure 2]2 is a diagram showing a state in which the electricity storage device according to the first embodiment is fixed to a vehicle body. FIG. [Figure 3] FIG. 2 is an exploded perspective view of the electricity storage device according to the first embodiment. [Figure 4] 1 is a plan view showing the inside of the electricity storage device according to the first embodiment. [Figure 5] FIG. 5 is a cross-sectional view taken along line VV shown in FIG. [Figure 6] 10 is a schematic cross-sectional view showing the positional relationship between a protective cover of a vehicle and a first protective member and a second protective member of an electricity storage device according to a second embodiment. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0023] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the embodiments described below, the same or common parts are denoted by the same reference numerals in the drawings, and the description thereof will not be repeated.

[0024] In the embodiments described below, when numbers, amounts, etc. are mentioned, the scope of the present disclosure is not necessarily limited to those numbers, amounts, etc., unless otherwise specified. Furthermore, in the embodiments described below, each component is not necessarily essential to the present disclosure, unless otherwise specified. Furthermore, when multiple embodiments are described below, it is intended from the beginning that the characteristic portions of each embodiment may be appropriately combined, unless otherwise specified.

[0025] (Embodiment 1) Fig. 1 is a schematic diagram of a vehicle according to embodiment 1. Fig. 2 is a diagram showing a state in which an electricity storage device according to embodiment 1 is fixed to a vehicle. Vehicle 1 according to embodiment 1 will be described with reference to Figs. 1 and 2.

[0026] The vehicle 1 is a hybrid electric vehicle, a plug-in hybrid electric vehicle, or a battery electric vehicle.

[0027] The vehicle 1 includes a vehicle body 2, front wheels 3, rear wheels 4, and an electricity storage device 10. The vehicle body 2 includes a frame member 5. The electricity storage device 10 has an upper surface 10a. The upper surface 10a may also function as a floor member that defines the interior of the vehicle cabin.

[0028] The framework member 5 includes a pair of side members 6 and a pair of side sills 7. The pair of side sills 7 are arranged on both ends of the vehicle 1 in the width direction. The pair of side members 6 are arranged at a distance inside the pair of side sills 7. The pair of side members 6 and the pair of side sills 7 extend along the front-rear direction of the vehicle 1.

[0029] The pair of side members 6 are spaced apart in the width direction of the vehicle 1. A main body 35 of the electricity storage device 10 is disposed in the gap between the pair of side members 6. A gap is provided between the main body 35 and the pair of side members 6. This makes it possible to suppress input of an impact to the electricity storage device 10 even in the event of a side collision of the vehicle 1.

[0030] Fixed portions 36 are provided on both side surfaces of the main body portion 35 in the width direction of the vehicle 1. The fixed portions 36 are fixed to the pair of side members 6 by fastening members 8.

[0031] The framework member 5 also includes a vehicle body cross member 9. The vehicle body cross member 9 is provided above the electricity storage device 10 so as to straddle from one side sill 7 to the other side sill 7. An upper surface 10a of the electricity storage device 10 is fixed to the vehicle body cross member 9. The upper surface 10a is formed by an upper member 31 (see FIG. 3 ), which will be described later.

[0032] In the above description, the framework member 5 includes a pair of side members 6 and a pair of side sills 7, but is not limited to this. The pair of side sills 7 may also function as the pair of side members 6. In this case, the pair of side members 6 can be omitted, and the above-mentioned fixed portion 36 may be fixed to the pair of side sills 7.

[0033] Fig. 3 is a schematic exploded perspective view of the energy storage device according to embodiment 1. Fig. 4 is a schematic plan view showing the interior of the energy storage device according to embodiment 1. Details of the energy storage device 10 will be described with reference to Fig. 3 and Fig. 4. Note that, for convenience, the second protective member 70 is omitted from Fig. 3, and the fixed portion 36 shown in Fig. 3 is omitted from Fig. 4.

[0034] As shown in Figures 3 and 4, the energy storage device 10 includes a plurality of energy storage stacks 20, a housing case 30, a cross member 40, a plurality of first protective members 50, a plurality of electrical connection members 60, a plurality of second protective members 70, and electronic equipment 95.

[0035] Each of the plurality of power storage stacks 20 includes a plurality of power storage cells 25. The plurality of power storage cells 25 are arranged in a first direction (DR1). In the present embodiment, the first direction is parallel to the width direction of the vehicle 1 when the power storage device 10 is mounted on the vehicle body 2.

[0036] Each storage cell 25 is a secondary battery such as a nickel-metal hydride battery or a lithium-ion battery. Each storage cell 25 may use a liquid electrolyte or a solid electrolyte. Each storage cell 25 may be a chargeable and dischargeable capacitor.

[0037] Specifically, the energy storage cell 25 includes a housing 28 (see FIG. 5) and an electrode assembly 29 (see FIG. 5). The electrode assembly 29 is housed in the housing 28. The electrode assembly 29 may be a laminated electrode assembly in which a negative electrode sheet, a separator, and a positive electrode sheet are laminated, or may be a wound electrode assembly in which a negative electrode sheet, a separator, and a positive electrode sheet are wound.

[0038] Each storage cell 25 includes a positive external terminal 26 and a negative external terminal 27. In each storage stack 20, the plurality of storage cells 25 are connected in series by bus bars. The plurality of storage cells 25 are arranged such that the positive external terminals 26 and the negative external terminals 27 are alternately arranged in the first direction. In each storage stack 20, the plurality of storage cells 25 are arranged.

[0039] The plurality of power storage stacks 20 are arranged side by side in a second direction (DR2). The second direction is a direction perpendicular to the first direction. In the present embodiment, the second direction is parallel to the longitudinal direction of the vehicle 1 in the mounted state.

[0040] The storage case 30 includes an upper member 31 and a lower case 32. The lower case 32 has a generally box-like shape that opens upward. A plurality of power storage stacks 20 are arranged inside the lower case 32.

[0041] The lower case 32 includes a main body 35 and a fixed portion 36. The main body 35 has a bottom wall 321, a first wall 322, a second wall 323, and side walls 324 and 325. The first wall 322, the second wall 323, and the side walls 324 and 325 are provided to stand upright from the periphery of the bottom wall 321.

[0042] The first wall 322 and the second wall 323 face each other in the second direction. The side walls 324 and 325 face each other in the first direction. The fixed portions 36 are provided on the outer surfaces of the side walls 324 and 325.

[0043] The upper member 31 has a generally flat plate shape. The upper member 31 covers the plurality of power storage stacks 20 from above and closes the open space of the lower case 32. A sealing member may be filled in the gap between the upper member 31 and the power storage stacks 20. The sealing member may have insulating properties. The upper member 31 may also function as a floor panel in addition to functioning as a lid member that closes the open space of the lower case 32 as described above.

[0044] The cross member 40 is fixed to the lower case 32. The cross member 40 is made of a metal member such as SUS. The cross member 40 extends along a first direction. The cross member 40 divides an area within the lower case 32. Specifically, the cross member 40 divides the area within the lower case 32 into two areas in which power storage stacks are arranged, and two power storage stacks 20 are arranged in each of the divided areas.

[0045] The above-mentioned multiple power storage stacks 20 include a first power storage stack 21 and a second power storage stack 22 that are arranged at an interval in the second direction. The first power storage stack 21 and the second power storage stack 22 are arranged adjacent to each other in the second direction, and the cross member 40 is arranged in a gap between the first power storage stack 21 and the second power storage stack 22.

[0046] The multiple first protective members 50 extend upward from the cross member 40. The multiple first protective members 50 are fixed to the cross member 40. The up-down direction is a direction perpendicular to the first direction and the second direction. The multiple first protective members 50 are arranged at intervals in the first direction.

[0047] Each of the plurality of second protective members 70 is provided at a position corresponding to each of the plurality of first protective members 50. Each of the plurality of second protective members 70 is held by each of the plurality of first protective members 50. Details of the first protective members 50 and the second protective members 70 will be described later with reference to FIG. 5.

[0048] The electronic device 95 is arranged on one side in the second direction of the plurality of power storage stacks 20. The electronic device 95 is, for example, a battery ECU (Electronic Control Unit).

[0049] The plurality of electrical connection members 60 electrically connects the plurality of power storage stacks 20 arranged side by side in the second direction in series.

[0050] The electrical connection member 61 connects, for example, a negative electrode in an electricity storage module formed by a plurality of electricity storage stacks 20 to an electronic device 95. The electrical connection member 62 electrically connects two electricity storage stacks 20 arranged in an area located on one side of the cross member 40 in the second direction in series.

[0051] The electrical connection member 63 electrically connects the above-described first power storage stack 21 and second power storage stack 22. More specifically, the electrical connection member 63 electrically connects a first power storage module formed by two power storage stacks 20 arranged in an area located on one side of the cross member 40 in the second direction, to a second power storage module formed by two power storage stacks 20 arranged in an area located on one side of the cross member 40 in the second direction.

[0052] When viewed from above, at least a portion of the electrical connection member 63 overlaps the cross member 40 and extends in the extension direction of the cross member 40. The electrical connection member 63 has a first routing portion 631, an extending portion 632, and a second routing portion 633. The first routing portion 631 extends in the first direction from the first power storage stack 21 toward the cross member 40.

[0053] When viewed from above, the extending portion 632 overlaps the cross member 40 of the electrical connection member 63. The extending portion 632 is located above the cross member 40 and extends along the cross member 40. The width of the extending portion 632 in the second direction is shorter than the width of the cross member 40. The length of the extending portion 632 in the above-mentioned extending direction is shorter than the length of the cross member 40.

[0054] The second wiring portion 633 extends in the first direction toward the second power storage stack 22 on the side opposite to the side on which the first wiring portion 631 is located in the first direction.

[0055] The electrical connection member 64 electrically connects in series two power storage stacks 20 arranged in an area located on the other side in the second direction of the cross member 40. The electrical connection member 65 connects, for example, a positive electrode in a battery module formed by a plurality of power storage stacks 20 to an electronic device 95.

[0056] The electrical connection members 61 to 65 are configured by bus bars. In the present embodiment, the electrical connection members 61 to 65 are configured by, for example, a metal member, and the first protective member 50 and the second protective member 70 are configured by, for example, an insulating member.

[0057] Fig. 5 is a schematic cross-sectional view taken along line VV shown in Fig. 4. With reference to Fig. 5, the cross member 40, the first protective member 50, and the second protective member 70 will be described in detail.

[0058] 5, the cross member 40 has a hollow structure. The cross member 40 includes a pair of side wall portions 41, 42 and an upper wall portion 43. The pair of side wall portions 41, 42 face each other in the direction in which the first power storage stack 21 and the second power storage stack 22 are aligned, i.e., in the second direction.

[0059] The side wall portion 41 is located on the first electricity storage stack 21 side. A flange portion 41f extending toward the first electricity storage stack 21 side is provided at the lower end of the side wall portion 41. The side wall portion 42 is located on the second electricity storage stack 22 side. A flange portion 42f extending toward the second electricity storage stack 22 side is provided at the lower end of the side wall portion 42.

[0060] The cross member 40 is fixed to the lower case 32 by fixing the flange portions 41f, 42f to the bottom wall portion 321 of the lower case 32 by welding, fastening, or the like.

[0061] The upper wall portion 43 connects the upper ends of the pair of side wall portions 41, 42. A through hole 43h is provided in the upper wall portion 43. An engaging portion 53p, which will be described later, is inserted into the through hole 43h.

[0062] The first protective member 50 includes a pair of wall portions 51, 52 and a bottom portion 53. The pair of wall portions 51, 52 face each other in an intersecting direction that intersects with the extending direction of the extending portion 632. Specifically, the pair of wall portions 51, 52 face each other in the second direction. The pair of wall portions 51, 52 are arranged at an interval from each other in the second direction. The extending portion 632 passes between the pair of wall portions 51, 52. The pair of wall portions 51, 52 are connected to the bottom portion 53. The pair of wall portions 51, 52 have upper surfaces 51a, 52a. The upper surfaces 51a, 52a are provided flat. The upper surfaces 51a, 52a are parallel to the second direction.

[0063] The bottom portion 53 is placed on the upper wall portion 43 of the cross member 40. An engagement portion 53p that protrudes downward is provided on the underside of the bottom portion 53. When inserted into a through hole 43h provided in the cross member 40, the engagement portion 53p engages with a portion of the upper wall portion 43 that is located on the periphery of the through hole 43h. This secures the first protective member 50 to the cross member 40. With this configuration, the first protective member 50 can be easily secured. The first protective member 50 may also be secured to the cross member 40 by welding, fastening, or the like.

[0064] The second protective member 70 has a covering portion 71 and an upper end portion 72. The covering portion 71 is disposed between the pair of wall portions 51, 52. The covering portion 71 covers a portion of the extending portion 632. More specifically, the covering portion 71 covers a portion of the extending portion 632 that is located between the pair of wall portions 51, 52. The covering portion 71 covers the extending portion 632 while being in close contact with the circumferential surface of the extending portion 632. The covering portion 71 extends in the up-down direction. The covering portion 71 is sandwiched between the pair of wall portions 51, 52.

[0065] A gap is formed between the lower end of the covering portion 71 and the bottom portion 53 of the first protective member 50. As a result, when a load is transmitted downward from the upper member 31 side, it is transmitted to the cross member along the pair of walls of the first protective member. As a result, the transmission of the load to the extending portion 632 covered by the covering portion 71 can be suppressed.

[0066] The upper end portion 72 has an upper surface 70a of the second protective member 70 and extends in the intersecting direction (more specifically, the second direction). The upper surface 70a is configured flat and is in contact with the inner surface of the upper member 31. The upper end portion 72 is located above the covering portion 71. The upper end portion 72 is connected to the covering portion 71. When viewed from below, the upper end portion 72 has a protruding portion 721 that protrudes from the covering portion 71 in the intersecting direction.

[0067] The protruding portion 721 is sandwiched between the upper member 31 and the upper surface 50a (i.e., upper surfaces 51a, 52a) of the first protective member 50. As a result, the second protective member 70 is held by the first protective member 50 in a state of contact with the upper ends of the pair of wall portions 51, 52. This suppresses vibration of the second protective member 70, and ultimately suppresses vibration of the extending portion 632 covered by the covering portion 71 of the second protective member 70.

[0068] The protrusion 721 is in contact with at least the end portions of the upper surfaces of the pair of wall portions 51, 52 that are located on the inside in the intersecting direction. Note that the protrusion 721 may be in partial contact with the inside portions of the upper surfaces of the pair of wall portions 51, 52, or may be in complete contact with the upper surfaces of the pair of wall portions 51, 52, as long as it can press the pair of wall portions 51, 52 in the direction in which they widen apart, as will be described later.

[0069] The protruding portion 721 has an inclined portion 721a that slopes upward toward the outside in the intersecting direction.

[0070] By providing the inclined portion 721a in this manner, when a load is applied downward from the upper member 31 side, the pair of wall portions 51, 52 of the first protective member 50 are pressed by the inclined portion 721a and deformed so as to move away from each other. In addition to this deformation, as described above, a gap is formed between the lower end of the second protective member 70 and the bottom portion 53 of the first protective member 50, which further reduces the load input to the electrical connection member 63.

[0071] The vehicle 1 also includes a buffer member 90. The buffer member 90 is disposed between the vehicle body 2 and the upper member 31. More specifically, the buffer member 90 is disposed between the vehicle body cross member 9 and the upper member 31. The buffer member 90 is disposed above the first protective member 50 and the second protective member 70, and is sandwiched between the vehicle body cross member 9 and the upper member 31.

[0072] When the buffer member 90 is arranged in this manner, if an external impact is applied to the power storage device 10, the buffer member 90 can reduce the external force transmitted to the vehicle frame members. Furthermore, when the power storage device 10 is mounted on the vehicle body, the power storage device 10 is mounted so as to be pressed against the buffer member 90, and the reaction force can press the first protective member 50 and the second protective member 70 against the cross member 40. This suppresses vibration of the first protective member 50 and the second protective member 70, and ultimately suppresses vibration of the electrical connection member 63 covered by the second protective member 70.

[0073] In the above description, the upper member 31 functions as a floor panel, and the buffer member 90 is disposed between the vehicle body cross member 9 and the upper member 31. However, the present invention is not limited to this. In a case where the vehicle body includes a floor panel 110 and the power storage device 10 is disposed below the floor panel 110, the buffer member 90 may be disposed between the floor panel 110 and the upper member 31, instead of the vehicle body cross member 9 described above. In this case, the buffer member 90 is located above the first protective member 50 and the second protective member 70.

[0074] When buffer member 90 is disposed as described above, if an external impact is applied to the power storage device, buffer member 90 can reduce the external force transmitted to floor panel 110. Furthermore, when mounting power storage device 10 on the vehicle body, by mounting power storage device 10 so that it is pressed against buffer member 90, the reaction force can press first protective member 50 and second protective member 70 against cross member 40. This suppresses vibration of first protective member 50 and second protective member 70, and ultimately suppresses vibration of electrical connection member 63 covered by second protective member 70.

[0075] As described above, in the energy storage device 10 according to the present embodiment, the rigidity of the lower case 32 is increased in the region where the cross member 40 is fixed. Therefore, when an external impact is applied to the lower case 32, deformation around the cross member 40 is suppressed. This makes it possible to suppress input of an external force to the extension portion 632 of the electrical connection member 63 that extends above and along the cross member 40. This suppresses deformation of the electrical connection member 63 and suppresses interference between the electrical connection member 63 and the energy storage stacks (specifically, the first energy storage stack 21 and the second energy storage stack 22). Furthermore, because the extension portion 632 passes between the pair of wall portions 51, 52 of the first protection member 50, interference of the extension portion 632 with the energy storage stacks can be further suppressed. In addition, since the second protective member 70 held by the first protective member 50 has a covering portion 71 that covers the extension portion 632 of the electrical connection member 63, vibrations and impacts applied to the electrical connection member 63 can be suppressed.

[0076] (Embodiment 2) 6 is a schematic cross-sectional view showing the positional relationship between a protective cover of a vehicle and a first protective member and a second protective member of an electricity storage device according to Embodiment 2. A vehicle 1A according to Embodiment 5 will be described with reference to FIG.

[0077] 6, vehicle 1A according to embodiment 2 differs from vehicle 1 according to embodiment 1 in that vehicle 1A includes protective cover 80 and wiring 85, and in the positions of first protective member 50 and second protective member 70. The other configurations are substantially the same.

[0078] The protective cover 80 protects the wiring 85 routed above the upper member 31. The protective cover 80 covers a portion of the upper member 31 from above the upper member 31 so as to form a space S between the protective cover 80 and the upper member 31. The wiring 85 is located within the space S. When viewed from the vertical direction, the protective cover 80 is arranged so as to overlap a portion of the cross member 40. When viewed from above, the protective cover 80 is arranged so as to overlap, for example, the center of the cross member 40 in the extension direction of the cross member 40. The protective cover 80 extends along a direction intersecting the above-mentioned extension direction. Specifically, the protective cover 80 extends along the second direction.

[0079] The protective cover 80 has a pair of side walls 81, 82 and a ceiling portion 83. The pair of side walls 81, 82 are arranged spaced apart from each other in the extension direction of the cross member 40. The pair of side walls 81, 82 have lower surfaces 81a, 82a. The ceiling portion 83 connects the upper ends of the pair of side walls 81, 82 to each other.

[0080] The first protective member 50 and the second protective member 70 are disposed below the lower surfaces 81 a, 82 a of the pair of side wall portions 81, 82. The first protective member 50 and the second protective member 70 are sandwiched between the upper member 31 and the cross member 40 below the lower surfaces 81 a, 82 a.

[0081] Even when configured as described above, vehicle 1A according to embodiment 2 can achieve substantially the same effects as vehicle 1 including power storage device 10 according to embodiment 1. In addition, by arranging first protective member 50 and second protective member 70 below each of lower surfaces 81a, 82a of a pair of side wall portions 81, 82, the load from protective cover 80 can press first protective member 50 and second protective member 70 toward cross member 40 via upper member 31. This suppresses vibration of first protective member 50 and second protective member 70, and ultimately suppresses vibration of electrical connection member 63 covered by second protective member 70.

[0082] In the first and second embodiments described above, the first direction is parallel to the width direction of the vehicle and the second direction is parallel to the front-rear direction of the vehicle, but the present invention is not limited to this. The first direction may be parallel to the front-rear direction of the vehicle, and the second direction may be parallel to the width direction of the vehicle.

[0083] Furthermore, in the above-described first and second embodiments, the case where the plurality of power storage stacks 20 are arranged in a single row has been described as an example, but the present invention is not limited to this, and the power storage stacks 20 may be arranged in a matrix.

[0084] The embodiments disclosed herein are illustrative in all respects and are not restrictive. The scope of the present invention is defined by the claims, and includes all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0085] REFERENCE SIGNS LIST 1, 1A vehicle, 2 vehicle body, 3 front wheel, 4 rear wheel, 5 frame member, 6 side member, 7 side sill, 8 fastening member, 9 vehicle body side cross member, 10 power storage device, 10a upper surface, 20 power storage stack, 21 first power storage stack, 22 second power storage stack, 25 power storage cell, 26 positive electrode external terminal, 27 negative electrode external terminal, 28 housing, 29 electrode body, 30 storage case, 31 upper member, 32 lower case, 35 main body portion, 36 fixed portion, 40 cross member, 41, 42 side wall portion, 41f, 42f flange portion, 43 upper wall portion, 43h through hole, 50 first protective member, 50a upper surface, 51, 52 wall portion, 51a, 52a upper surface, 53 bottom portion, 53p Engagement portion, 60, 61, 62, 63, 64, 65: electrical connection member, 70: second protective member, 70a: upper surface, 71: covering portion, 72: upper end portion, 80: protective cover, 81, 82: side wall portion, 81a, 82a: lower surface, 83: ceiling portion, 85: wiring, 90: buffer member, 95: electronic device, 110: floor panel, 321: bottom wall portion, 322: first wall portion, 323: second wall portion, 324, 325: side wall portion, 631: first wiring portion, 632: extension portion, 633: second wiring portion, 721: protrusion portion, 721a: inclined portion, S: space.

Claims

1. a first power storage stack and a second power storage stack each including a plurality of power storage cells; a lower case in which the first power storage stack and the second power storage stack are disposed; a cross member disposed between the first power storage stack and the second power storage stack and partitioning an area within the lower case; an electrical connection member that electrically connects the first power storage stack and the second power storage stack and includes an extension portion that extends above the cross member and along the cross member; a first protective member and a second protective member that protect the electrical connection member; the first protection member includes a bottom portion and a pair of wall portions that face each other in a direction intersecting the extension direction of the extension portion and are connected to the bottom portion, and is fixed to an upper wall of the cross member; the extension portion passes between the pair of wall portions, The second protective member includes a covering portion that covers the extension portion between the pair of wall portions, and is held by the first protective member in a state in contact with upper ends of the pair of wall portions.

2. an upper member that closes the lower case and covers the first power storage stack and the second power storage stack from above, an upper surface of the second protection member contacts the upper member; The power storage device according to claim 1 , wherein a gap is provided between a lower end of the covering portion and the bottom portion.

3. The upper surfaces of the pair of wall portions are flat, the second protective member includes an upper end portion that has the upper surface of the second protective member and extends in the intersecting direction above the covering portion, the upper end portion has a protruding portion that protrudes from the covering portion in the intersecting direction when viewed from below, The power storage device according to claim 2 , wherein the protrusion contacts end portions of the upper surfaces of the pair of wall portions that are located on the inside in the intersecting direction, and has an inclined portion that slopes upward toward the outside in the intersecting direction.

4. The car body and A vehicle comprising: the power storage device according to any one of claims 1 to 3 mounted on the vehicle body.

5. The vehicle body includes a floor panel, The power storage device is disposed below the floor panel, a buffer member disposed between the floor panel and the power storage device, The vehicle according to claim 4 , wherein the buffer member is disposed above the first protective member and the second protective member.

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