Power storage device and vehicle

Abstract

To provide a power storage device suppressing interference between an electric connection member and a power storage stack when a load is input from outside.SOLUTION: A 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 where the first power storage stack 21 and the second power storage stack 22 are disposed; a cross member 40 extending along a predetermined direction and partitioning an area in the lower case; and an electric connection member 63 electrically connecting the first power storage stack 21 to the second power storage stack 22. When viewed from a vertical direction, the electric connection member 63 overlaps on the cross member 40 at least partially and extends along the direction where the cross member 40 extends.SELECTED DRAWING: Figure 4

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 the purpose of the present disclosure is to provide an energy storage device that can suppress interference between an electrical connection member and an energy storage stack when an external load is input, and a vehicle equipped with the energy storage device. [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 extending in a predetermined direction and partitioning an area within the lower case, and an electrical connection member electrically connecting the first energy storage stack and the second energy storage stack. When viewed in the vertical direction, at least a portion of the electrical connection member overlaps with the cross member and extends in the direction in which the cross member extends.

[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 load is applied to the lower case, deformation around the cross member is suppressed. This prevents the portion of the electrical connection member that overlaps the cross member and extends in the direction of extension of the cross member from being subjected to the load. As a result, interference between the electrical connection member and the power storage stack is suppressed, and short-circuiting of the power storage stack is suppressed.

[0009] In the energy storage device based on the present disclosure, in a direction perpendicular to the extension direction, the width of the portion of the electrical connection member that overlaps the cross member and extends along the extension direction of the cross member may be shorter than the width of the cross member.

[0010] According to the above configuration, the width of the portion of the electrical connection member that overlaps the cross member and extends along the extension direction of the cross member is shorter than the width of the cross member, thereby more effectively suppressing interference between the electrical connection member and the storage stack.

[0011] In the energy storage device based on the present disclosure, the length of the portion of the electrical connection member that overlaps the cross member and extends along the extension direction of the cross member may be shorter than the length of the cross member.

[0012] According to the above configuration, the length of the portion of the electrical connection member that overlaps the cross member and extends along the extension direction of the cross member is shorter than the length of the cross member, thereby more effectively suppressing interference between the electrical connection member and the storage stack.

[0013] In the power storage device according to the present disclosure, the cross member may be disposed between the first power storage stack and the second power storage stack. A portion of the electrical connection member that overlaps the cross member and extends along the extension direction of the cross member may be disposed between the first power storage stack and the second power storage stack.

[0014] According to the above configuration, even in a situation where the portion of the electrical connection member that overlaps the cross member and extends along the extension direction of the cross member is positioned between the first and second storage stacks, deformation around the cross member is suppressed, thereby preventing the electrical connection member from interfering with either the first or second storage stack.

[0015] The power storage device according to the present disclosure may further include a holding member fixed to the cross member so as to extend vertically upward from the cross member. The holding member may hold portions of the electrical connection members that overlap the cross member and extend along the extension direction of the cross member. The holding member may protrude vertically upward beyond the first power storage stack and the second power storage stack.

[0016] According to the above configuration, when a load is applied from above the power storage device, the area directly above the holding member can be prevented from deforming downward, thereby protecting the electrical connection member.

[0017] In the energy storage device based on the present disclosure, the holding member may have an insertion portion into which a portion of the electrical connection member that overlaps the cross member and extends along the extension direction of the cross member is inserted.

[0018] According to the above configuration, the electrical connection member can be prevented from vibrating when the electrical connection member is inserted into the insertion portion.

[0019] In the power storage device according to the present disclosure, the holding member may have a protrusion on a surface that defines the insertion portion.

[0020] According to the above configuration, the protrusion is provided, so that it is possible to prevent the electrical connection member from coming off the insertion portion due to external vibration.

[0021] The power storage device according to the present disclosure may include a cover member that covers the first power storage stack and the second power storage stack from above in the vertical direction, and the holding member may be in contact with the cover member.

[0022] According to the above configuration, by bringing the holding member into contact with the cover member, the holding member can be sandwiched between the cover member and the cross member, and vibration of the holding member can be suppressed.

[0023] A vehicle according to the present disclosure includes the above-described power storage device and a vehicle frame member.

[0024] According to the above configuration, by including the above-described power storage device, interference between the electrical connection member and the power storage stack can be suppressed, and short-circuiting of the power storage stack can be suppressed.

[0025] The vehicle according to the present disclosure may further include a buffer member disposed in a gap between the cover member and the vehicle frame member, and the buffer member may be disposed above the holding member.

[0026] According to the above configuration, when an external load is applied to the electric storage device, the shock absorber can reduce the load transmitted to the vehicle frame. Furthermore, when the electric storage device is mounted on the vehicle body, the shock absorber can be pressed against the shock absorber, and the reaction force can press the holding member against the cross member. This suppresses vibration of the holding member, and ultimately suppresses vibration of the electrical connection members held by the holding member.

[0027] The vehicle according to the present disclosure may include a protective cover that covers a portion of the cover member from above so as to form a space between the cover member and the protective cover. The protective cover may have a pair of side walls that are spaced apart from each other in the extension direction of the cross member. In this case, the retaining member may be disposed below the lower surface of each of the pair of side walls.

[0028] According to the above configuration, the load from the protective cover can press the holding member toward the cross member via the cover member, thereby suppressing vibration of the holding member. [Effects of the Invention]

[0029] According to the present disclosure, it is possible to provide an electricity storage device that can suppress interference between an electrical connection member and an electricity storage stack when an external load is applied, and a vehicle including the electricity storage device. [Brief explanation of the drawings]

[0030] [Figure 1] 1 is a schematic diagram of a vehicle according to a first embodiment. [Figure 2] 1 is a diagram showing a state in which the power storage device according to the first embodiment is fixed to a vehicle. [Figure 3] 1 is a schematic exploded perspective view of an electricity storage device according to a first embodiment. [Figure 4] 1 is a schematic plan view showing the inside of a power storage device according to a first embodiment. [Figure 5] FIG. 5 is a schematic cross-sectional view taken along line VV shown in FIG. [Figure 6] 10 is a schematic cross-sectional view showing the structure around a cross member in an electricity storage device according to a second embodiment. FIG. [Figure 7] 11 is a schematic cross-sectional view showing the structure around a cross member of an electricity storage device in a vehicle according to a third embodiment. FIG. [Figure 8] 10 is a schematic cross-sectional view showing the structure around a cross member in an electricity storage device according to a fourth embodiment. FIG. [Figure 9] 10 is a schematic cross-sectional view showing the positional relationship between a protective cover of a vehicle and a holding member for an electricity storage device according to a fifth embodiment. FIG. [Figure 10] 13 is a schematic plan view showing the inside of a power storage device according to a sixth embodiment. FIG. [Figure 11] 13 is a schematic plan view showing the inside of a power storage device according to a seventh embodiment. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0031] 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.

[0032] 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.

[0033] (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.

[0034] The vehicle 1 is a hybrid vehicle that can run using at least one of the power of a motor and an engine, or an electric vehicle that runs using driving force obtained from electrical energy.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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 a cover member 31 (see FIG. 3 ), which will be described later.

[0040] 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.

[0041] 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 Figs. 3 and 4. Note that, for convenience, the fixed portion shown in Fig. 3 is omitted in Fig. 4.

[0042] As shown in FIGS. 3 and 4, the power storage device 10 includes a plurality of power storage stacks 20, a housing case 30, a cross member 40, a plurality of holding members 50, a plurality of electrical connection members 60, and electronic equipment 95.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] The storage case 30 includes a cover member 31 and a lower case 32. The lower case 32 has a generally box-like shape that opens upward. In the lower case 32, a plurality of power storage stacks 20 are arranged.

[0049] 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.

[0050] 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.

[0051] The cover member 31 has a generally flat plate shape. The cover member 31 covers the multiple power storage stacks 20 and closes the open space of the lower case 32. A sealing member may be filled in the gap between the cover member 31 and the power storage stacks 20. The sealing member may have insulating properties. The cover 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.

[0052] 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 in a predetermined direction and separates an area within the lower case 32. Specifically, the cross member 40 extends in a first direction. The cross member 40 divides the area within the lower case 32 into two areas, and two power storage stacks 20 are arranged in each of the divided areas.

[0053] 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 so as to be 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.

[0054] The multiple holding members 50 are fixed to the cross member 40 so as to face in the vertical direction from the cross member 40. The vertical direction is a direction perpendicular to the first and second directions. The multiple holding members 50 are arranged at intervals in the first direction.

[0055] 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).

[0056] 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.

[0057] The electrical connection member 61 connects, for example, a negative electrode in a battery module formed of a plurality of power storage stacks 20 to an electronic device 95. The electrical connection member 62 electrically connects two power storage stacks 20 arranged in an area located on one side of the cross member 40 in the second direction in series.

[0058] 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.

[0059] When viewed in the vertical direction, at least a portion of the electrical connection member 63 overlaps the cross member 40 and extends along the extension direction of the cross member 40. Specifically, the electrical connection member 63 has a first routing portion 631, an overlapping portion 632, and a second routing portion 633. The first routing portion 631 extends along the first direction from the first power storage stack 21 toward the cross member 40.

[0060] The overlapping portion 632 is a portion of the electrical connection member 63 that overlaps with the cross member 40 when viewed vertically and extends along the extension direction of the cross member 40. In a direction perpendicular to the extension direction, the width of the overlapping portion 632 is shorter than the width of the cross member 40. In the extension direction, the length of the overlapping portion 632 is shorter than the length of the cross member 40.

[0061] 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.

[0062] 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.

[0063] 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 and the holding member 50 will be described in detail.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] The holding member 50 holds the overlapping portion 632. The holding member 50 has an insertion portion 50c into which the overlapping portion 632 is inserted. The overlapping portion 632 is held by being inserted into the insertion portion 50c. Note that "the overlapping portion 632 is held" does not necessarily mean that the overlapping portion 632 is maintained in contact with the surface of the holding member 50 that defines the insertion portion 50c, but also means that the overlapping portion 632 is positioned within the insertion portion 50c, away from the surface. In other words, "the overlapping portion 632 is held" means that the overlapping portion 632 is maintained in a state positioned within a space defined by the surface of the holding member 50 that defines the insertion portion 50c. The upper end portion 50a of the holding member 50 abuts against the cover member 31. This makes it possible to suppress vibration of the holding member 50.

[0069] The holding member 50 has a substantially U-shape. The holding member 50 has a pair of wall portions 51, 52 facing each other in the second direction and a bottom portion 53. The pair of wall portions 51, 52 are arranged with a gap between them in the second direction. The pair of wall portions 51, 52 are provided so as to protrude upward from both ends of the bottom portion 53 in the second direction. A space is formed between the pair of wall portions 51, 52 above the bottom portion 53, and this space constitutes the above-mentioned insertion portion 50c.

[0070] A portion of the overlapping portion 632 is inserted into the space between the pair of wall portions 51, 52, and the overlapping portion 632 is sandwiched between the pair of wall portions 51, 52. This makes it possible to suppress vibration of the overlapping portion 632. Furthermore, protrusions 54, 55 are provided on the inner circumferential surface of the holding member 50 that defines the insertion portion 50c. The protrusions 54, 55 are provided spaced apart from each other in the second direction. The protrusion 54 is provided on the inner surface of one wall portion 51 of the pair of wall portions 51, and the protrusion 55 is provided on the inner surface of the other wall portion 52 of the pair of wall portions 51.

[0071] When the overlapping portion 632 is inserted into the insertion portion 50c, the protrusions 54 and 55 are disposed above the overlapping portion 632. This makes it possible to prevent the overlapping portion 632 from slipping out upward.

[0072] The protrusions 54, 55 may press the overlapping portion 632 downward, so that the overlapping portion 632 is sandwiched between the protrusions 54, 55 and the bottom portion 53. In this case as well, vibration of the overlapping portion 632 can be suppressed.

[0073] Upper ends 51a, 52a of the pair of wall portions 51, 52 abut against the cover member 31. The load of the cover member 31 is supported by the pair of wall portions 51, 52, thereby preventing the pair of wall portions 51, 52 from opening apart. In addition, the load may be used to press the overlapping portion 632 against the bottom portion 53 with the protrusions 54, 55.

[0074] On the other hand, in the received state, a gap may be provided between the protrusions 54, 55 and the overlapping portion 632. In this case, when a load such as an impact is applied from above the cover member 31, the load can be prevented from being transmitted to the overlapping portion 632. This can prevent damage to the overlapping portion 632.

[0075] An engagement portion 53p that protrudes downward is provided on the lower surface 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 holding member 50 to the cross member 40. With this configuration, the holding member 50 can be easily secured. The holding member 50 may also be secured to the cross member 40 by welding, fastening, or the like.

[0076] The electrical connection member 63 is made of a bus bar. In this embodiment, the electrical connection member 63 is made of a metal material, and the holding member 50 is made of an insulating material. Note that the other electrical connection members may also be configured in the same manner as the electrical connection member 63.

[0077] As described above, in the energy storage device 10 of embodiment 1, a cross member 40 is provided between the first energy storage stack 21 and the second energy storage stack 22 that are adjacent in the second direction, and the electrical connection member 63 that connects the first energy storage stack 21 and the second energy storage stack 22 includes an overlapping portion 632 that overlaps the cross member 40 when viewed vertically and extends along the extension direction of the cross member 40.

[0078] Here, since the rigidity of the lower case 32 is high in the region where the cross member 40 is fixed, deformation around the cross member 40 is suppressed when an external load is applied to the lower case 32. For example, when the vehicle 1 is side-collisioned and an impact is applied in the width direction (first direction) of the vehicle, the cross member 40 braces itself, suppressing inward deformation of the side wall portion of the lower case 32 in the region where the cross member 40 is disposed, and suppressing deformation of the cross member 40 itself. This makes it possible to suppress load application to the overlapping portion 632 that extends in the extension direction of the cross member 40 and overlaps with the cross member 40. As a result, interference between the electrical connection member 63 and the first power storage stack 21 and the second power storage stack 22 is suppressed, and short-circuiting between the first power storage stack 21 and the second power storage stack 22 can be suppressed.

[0079] Furthermore, when the vehicle 1 collides head-on or rear-on and an impact is input in the longitudinal direction (first direction) of the vehicle 1, inertia is prevented from narrowing the gap between the first power storage stack 21 and the second power storage stack 22. This also prevents the overlapping portion 632 that overlaps the cross member 40 arranged in the gap between the first power storage stack 21 and the second power storage stack 22 from being pinched between the first power storage stack 21 and the second power storage stack 22. As a result, interference between the electrical connection member 63 and the first power storage stack 21 and the second power storage stack 22 is prevented, and a short circuit between the first power storage stack 21 and the second power storage stack 22 can be prevented.

[0080] Furthermore, as described above, the width of the overlapping portion 632 is shorter than the width of the cross member 40, so that interference between the electrical connection member 63 and the first and second storage stacks 21 and 22 can be more effectively suppressed.

[0081] In addition, as described above, the length of overlapping portion 632 along the extension direction of cross member 40 is shorter than the length of cross member 40, which prevents the side wall portion of lower case 32 from hitting electrical connection member 63 in the event of a side collision of vehicle 1. This makes it possible to more effectively prevent interference between electrical connection member 63 and first and second power storage stacks 21 and 22.

[0082] (Embodiment 2) 6 is a schematic cross-sectional view showing the structure around the cross member in the electricity storage device according to Embodiment 2. With reference to FIG. 6, an electricity storage device 10A according to Embodiment 2 will be described.

[0083] 6, when compared with the power storage device 10 according to the first embodiment, the power storage device 10A according to the second embodiment differs in the configuration of the electrical connection member 63. The other configurations are substantially the same.

[0084] The electrical connection member 63 includes a conductive member 63A and a protective member 63B. The protective member 63B is made of an insulating member and has a hollow structure. The conductive member 63A is disposed in the hollow portion of the protective member 63B. The conductive member 63A is disposed inside the protective member 63B, away from the protective member 63B. In other words, a gap is formed between the protective member 63B and the conductive member 63A. Note that other electrical connection members may also be configured in the same manner as the electrical connection member 63.

[0085] Even when configured in this manner, the energy storage device 10A according to the second embodiment can achieve substantially the same effects as those of the first embodiment. Because the conductive member 63A is separated from the protective member 63B, it is possible to prevent a load applied to the protective member 63B from being transmitted to the conductive member 63A. This prevents damage to the conductive member 63A and more effectively prevents interference between the electrical connection member 63 and the first energy storage stack 21 and the second energy storage stack 22. Furthermore, because the protective member 63B is held by the holding member 50, the protective member 63B also functions as a support for supporting the cover member 31. This prevents deformation of the cover member 31 or the bottom wall portion 321 when a load is applied from above the cover member 31 or below the bottom wall portion 321.

[0086] (Embodiment 3) Fig. 7 is a schematic cross-sectional view showing the structure around a cross member of an electricity storage device in a vehicle according to Embodiment 3. With reference to Fig. 7, an electricity storage device 10B according to Embodiment 3 will be described.

[0087] 7, the vehicle according to the third embodiment differs from the vehicle including the power storage device 10A according to the second embodiment in that a buffer member 70 is provided between the vehicle body 2 and the cover member 31. The other configurations are substantially the same.

[0088] The buffer member 70 is sandwiched between the framework member 5 and the cover member 31 above the holding member 50. More specifically, the buffer member 70 is disposed between the vehicle body side cross member 9 and the cover member 31.

[0089] Even when configured in this manner, the vehicle according to the third embodiment can achieve substantially the same effects as a vehicle equipped with the power storage device 10A according to the second embodiment. In addition, by providing the buffer member 70, when an external load is applied to the power storage device 10B, the load transmitted to the vehicle frame by the buffer member can be reduced. Furthermore, when the power storage device 10B is mounted on the vehicle body 2, the power storage device 10B is mounted so as to be pressed against the buffer member 70, and thereby the holding member 50 can be pressed against the cross member 40 by the reaction force. This suppresses vibration of the holding member 50, and ultimately suppresses vibration of the overlapping portion 632 held by the holding member 50.

[0090] (Fourth embodiment) Fig. 8 is a schematic cross-sectional view showing the structure around the cross member in the electricity storage device according to embodiment 4. With reference to Fig. 8, an electricity storage device 10C according to embodiment 4 will be described.

[0091] 8, power storage device 10C according to embodiment 4 differs from power storage device 10A according to embodiment 2 mainly in the configuration of electrical connection member 63. The other configurations are substantially the same.

[0092] The electrical connection member 63 includes a wiring portion 63A1 and a protective member 63B. In this embodiment, the protective member 63B is also made of an insulating member and has a hollow structure. The wiring portion 63A1 is disposed in the hollow portion of the protective member 63B. A gap is formed between the protective member 63B and the wiring portion 63A1. The wiring portion 63A1 has a substantially cylindrical shape, and the protective member 63B has a substantially cylindrical shape. The wiring portion 63A1 is formed, for example, by a wire harness. The overlapping portion 632 of the electrical connection member 63 is sandwiched between the pair of protrusions 54, 55 and the bottom portion 53.

[0093] Even when configured in this manner, power storage device 10C according to the third embodiment can achieve substantially the same effects as power storage device 10A according to the second embodiment.

[0094] (Embodiment 5) 9 is a schematic cross-sectional view showing the positional relationship between a protective cover of a vehicle and a holding member for an electricity storage device according to embodiment 5. A vehicle 1D according to embodiment 5 will be described with reference to FIG.

[0095] 9, vehicle 1D according to embodiment 5 differs from vehicle 1 according to embodiment 1 in that it includes protective cover 80 and wiring 85, and in the position of holding member 50. The other configurations are substantially the same.

[0096] The protective cover 80 protects the wiring 85 routed above the cover member 31. The protective cover 80 covers a portion of the cover member 31 from above the cover member 31 so that a space S is formed between the protective cover 80 and the cover member 31. The wiring 85 is located within the space S. The protective cover 80 is arranged so as to overlap a portion of the cross member 40 when viewed from the vertical direction. 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 when viewed from the vertical direction. The protective cover 80 extends along a direction intersecting the extension direction. Specifically, the protective cover 80 extends along the second direction.

[0097] 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.

[0098] The holding member 50 is disposed below the lower surfaces 81a, 82a of the pair of side wall portions 81, 82. The holding member 50 is sandwiched between the cover member 31 and the cross member 40 below the lower surfaces 81a, 82a.

[0099] Even when configured as described above, the vehicle according to the fifth embodiment can achieve substantially the same effects as the vehicle 1 equipped with the power storage device 10 according to the first embodiment. In addition, by arranging the retaining member 50 below each of the lower surfaces 81a, 82a of the pair of side wall portions 81, 82, the load from the protective cover 80 can press the retaining member 50 toward the cross member 40 via the cover member 31. This can suppress vibration of the retaining member 50.

[0100] (Embodiment 6) Fig. 10 is a schematic plan view showing the inside of a power storage device according to embodiment 6. With reference to Fig. 10, a power storage device 10E according to embodiment 6 will be described.

[0101] 10, a power storage device 10E according to the sixth embodiment differs from the power storage device 10 according to the first embodiment mainly in the arrangement of the multiple power storage stacks 20 and the routing of the electrical connection members 60. The other configurations are substantially the same.

[0102] In the present embodiment, the first direction in which the plurality of power storage cells 25 are arranged is parallel to the front-to-rear direction of the vehicle, and the second direction perpendicular to the first direction is parallel to the width direction of the vehicle.

[0103] The plurality of power storage stacks 20 are arranged in a matrix. The plurality of power storage stacks 20 are arranged, for example, in four rows and two columns, with a first direction being the row direction and a second direction orthogonal to the first direction being the column direction. More specifically, when four power storage stacks 20, each including a plurality of power storage cells 25 arranged in the first direction, are arranged side by side in the second direction to form one power storage unit, the first power storage unit 91 and the second power storage unit 92 are arranged side by side in the first direction at intervals. Note that each power storage stack 20 includes an even number of power storage cells 25.

[0104] The first electricity storage unit 91 and the second electricity storage unit 92 each have two sets of a first electricity storage stack 21 and a second electricity storage stack 22 arranged adjacent to each other in the second direction.

[0105] The cross member 40 is disposed in the gap between the first electricity storage unit 91 and the second electricity storage unit 92. The cross member 40 extends in the second direction.

[0106] The plurality of electrical connection members 60 includes electrical connection members 61, 62, 63, 64, 65, 66, 67, and 68, and electrically connects the plurality of power storage stacks 20 in series.

[0107] Electrical connection members 62, 64, 66, and 67 connect the first power storage stack 21 and the second power storage stack 22 that are adjacent to each other.

[0108] Specifically, the electrical connection member 62 electrically connects the first power storage stack 21 and the second power storage stack 22 of one of the two sets of the first power storage stack 21 and the second power storage stack 22 included in the first power storage unit 91. The electrical connection member 64 electrically connects the first power storage stack 21 and the second power storage stack 22 of the other of the two sets of the first power storage stack 21 and the second power storage stack 22 included in the first power storage unit 91.

[0109] The electrical connection member 66 electrically connects the first power storage stack 21 and the second power storage stack 22 of one of the two sets of first power storage stacks 21 and second power storage stacks 22 included in the second power storage unit 92. The electrical connection member 67 electrically connects the first power storage stack 21 and the second power storage stack 22 of the other of the two sets of first power storage stacks 21 and second power storage stacks 22 included in the first power storage unit 91.

[0110] These electrical connection members 62, 64, 66, and 67 overlap the cross member 40 when viewed in the vertical direction and have overlapping portions 62E, 64E, 66E, and 67E, respectively, that extend along the extension direction of the cross member 40.

[0111] The two holding members 50 are, for example, arranged side by side at an interval in the second direction. One of the two holding members 50 holds the overlapping portions 62E and 67E, and the other of the two holding members 50 holds the overlapping portions 64E and 66E.

[0112] In this embodiment, two sets of first storage stacks 21 and second storage stacks 22 are arranged in two rows in the first direction, and the electrical connection members that electrically connect each set of first storage stacks 21 and second storage stacks 22 are held in common by a single holding member 50.

[0113] Even when configured as described above, the power storage device 10E according to the sixth embodiment has substantially the same effects as the power storage device 10 according to the first embodiment.

[0114] (Embodiment 7) Fig. 11 is a schematic plan view showing the inside of a power storage device according to embodiment 7. With reference to Fig. 11, a power storage device 10F according to embodiment 7 will be described.

[0115] 11, when compared with the energy storage device 10 according to the first embodiment, the energy storage device 10F according to the seventh embodiment differs mainly in the arrangement of the plurality of energy storage stacks 20, the arrangement of the cross members 40, and the routing of the electrical connection members 60. The other configurations are substantially the same.

[0116] In the present embodiment, the first direction in which the plurality of power storage cells 25 are arranged is parallel to the width direction of the vehicle, and the second direction perpendicular to the first direction is parallel to the front-rear direction of the vehicle.

[0117] The plurality of power storage stacks 20 are arranged in a matrix, for example, 3 rows and 2 columns, with a first direction as the column direction and a second direction orthogonal to the first direction as the matrix direction.

[0118] More specifically, when three power storage stacks 20, each including a plurality of power storage cells 25 arranged in the first direction, are arranged side by side in the second direction to form one power storage unit, a first power storage unit 91 and a second power storage unit 92 are arranged side by side in the first direction at intervals from each other. Each power storage stack 20 includes an even number of power storage cells 25.

[0119] Each of the first power storage unit 91 and the second power storage unit 92 includes a pair of a first power storage stack 21 and a second power storage stack 22 arranged adjacent to each other in the second direction.

[0120] The cross member 40 is disposed in the gap between the first electricity storage unit 91 and the second electricity storage unit 92. The cross member 40 extends in the second direction.

[0121] The plurality of electrical connection members 60 includes electrical connection members 61, 62, 63, 64, and 65, and electrically connects the plurality of power storage stacks 20 in series.

[0122] The electrical connection members 62, 64 connect the first power storage stack 21 and the second power storage stack 22 that are adjacent to each other.

[0123] Specifically, the electrical connection member 62 electrically connects the first power storage stack 21 and the second power storage stack 22 included in the first power storage unit 91. The electrical connection member 64 electrically connects the first power storage stack 21 and the second power storage stack 22 included in the second power storage unit 92.

[0124] These electrical connection members 62, 64 overlap the cross member 40 when viewed in the vertical direction and have overlapping portions 62F, 64F, respectively, that extend along the extension direction of the cross member 40.

[0125] In this embodiment, two sets of first storage stacks 21 and second storage stacks 22 are arranged in two rows in the first direction, and the electrical connection members that electrically connect each set of first storage stacks 21 and second storage stacks 22 are held in common by a single holding member 50.

[0126] Even when configured as described above, the power storage device 10F according to the seventh embodiment has substantially the same effects as the power storage device 10 according to the first embodiment.

[0127] 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]

[0128] REFERENCE SIGNS LIST 1, 1D 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, 10A, 10B, 10C, 10E, 10F energy storage device, 10a upper surface, 20 energy storage stack, 21 first energy storage stack, 22 second energy storage stack, 25 energy storage cell, 26 positive electrode external terminal, 27 negative electrode external terminal, 28 housing, 29 electrode body, 30 storage case, 31 cover 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 holding member, 50a upper end portion, 50c insertion portion, 51, 52 Wall portion, 51a, 52a upper end, 53 bottom portion, 53p engaging portion, 54, 55 protrusion portion, 60, 61, 62, 63, 64, 65, 66, 67, 68 electrical connection member, 62E, 62F, 64E, 64F, 66E, 67E overlapping portion, 63A1 wiring portion, 63A conductive member, 63B protective member, 70 buffer member, 80 protective cover, 81a, 82a lower surface, 81, 82 side wall portion 83 ceiling portion, 85 wiring, 91 first power storage unit, 92 second power storage unit, 95 electronic device, 321 bottom wall portion, 322 first wall portion, 323 second wall portion, 324, 325 side wall portion, 631 first wiring portion, 632 overlapping portion, 633 second wiring 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 extending in a predetermined direction 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, When viewed in the vertical direction, the electrical connection member at least partially overlaps the cross member and extends along the extending direction of the cross member.

2. 2. The power storage device according to claim 1, wherein a width of a portion of the electrical connection member that overlaps the cross member and extends along the extension direction of the cross member in a direction perpendicular to the extension direction is shorter than a width of the cross member.

3. The power storage device according to claim 1 , wherein a length of a portion of the electrical connection member that overlaps with the cross member and extends along the extension direction of the cross member is shorter than a length of the cross member.

4. the cross member is disposed between the first power storage stack and the second power storage stack; 4. The energy storage device according to claim 1, wherein a portion of the electrical connection member that overlaps the cross member and extends along the extension direction of the cross member is positioned between the first energy storage stack and the second energy storage stack.

5. a holding member fixed to the cross member so as to extend upward in the vertical direction from the cross member; the holding member holds a portion of the electrical connection member that overlaps with the cross member and extends along the extension direction of the cross member, The power storage device according to claim 1 , wherein the holding member protrudes upward in the vertical direction beyond the first power storage stack and the second power storage stack.

6. The power storage device according to claim 5 , wherein the holding member has an insertion portion into which a portion of the electrical connection member that overlaps the cross member and extends along the extension direction of the cross member is inserted.

7. The power storage device according to claim 6 , wherein the holding member has a protrusion on a surface that defines the insertion portion.

8. a cover member that covers the first power storage stack and the second power storage stack from above in the vertical direction; The power storage device according to claim 5 , wherein the holding member is in contact with the cover member.

9. The power storage device according to claim 8 ; A vehicle comprising: a vehicle frame member.

10. a buffer member disposed in a gap between the cover member and the vehicle frame member, The vehicle according to claim 9 , wherein the buffer member is disposed above the holding member.

11. a protective cover that covers a part of the cover member from above so as to form a space between the cover member and the protective cover; the protective cover has a pair of side wall portions spaced apart from each other in the extension direction of the cross member, The vehicle according to claim 9 , wherein the retaining member is disposed below a lower surface of each of the pair of side wall portions.

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