Integrated structure and method for integrating battery packs

Abstract

To provide an integrated structure and a method for integrating battery packs allowing battery packs for a vehicle to be integrated in a more compact manner.SOLUTION: An integrated structure 1 in which rectangular battery packs 300 for a vehicle are integrated in a thickness direction, comprises: frame members 30 that are attached to both sides in a width direction of each battery pack 300, and extend in a lengthwise direction of the battery pack 300; column members 10 that are provided on four corners of the integrated battery packs 300, and extend in a vertical direction; and a plurality of spacer members 20 that are attached to the column members 10 at a distance in the vertical direction, and to which the frame members 30 are fixed.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to an integrated structure and a method for integrating battery packs.

Background Art

[0002] Conventionally, so-called cubicle-type high-voltage power receiving equipment has been widely spread. For example, Patent Document 1 discloses a cubicle monitoring system in which a storage battery is installed in a cubicle as a power source for driving a load during a power outage, and remote monitoring of the cubicle can be continued even if the power outage lasts for a long time.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The battery pack for electric vehicles (hereinafter simply referred to as the vehicle battery pack) is said to have a lifespan when the battery capacity reaches about 70%. In other words, even a used vehicle battery pack still has a remaining capacity of 70%, so it can be fully reused for ESS (electric power storage) applications such as household use.

[0005] As a specific example of reusing a used vehicle battery pack, for example, it can be used as a storage battery for cubicle-type high-voltage power receiving equipment.

[0006] However, since the load of the vehicle battery pack is heavy, when the vehicle battery pack is used as a battery in a cubicle type high-voltage power receiving facility, a pallet, a shelf board, or a frame was assembled and the vehicle battery pack was stored therein. With such a storage method, there was a problem that the cubicle type high-voltage power receiving facility became huge because a pallet, a shelf board, or a frame was interposed between adjacent vehicle battery packs.

[0007] The present invention has been made in view of such circumstances, and an object thereof is to provide an integrated structure and a method for integrating battery packs for vehicles that can integrate battery packs for vehicles more compactly.

Means for Solving the Problems

[0008] The integrated structure according to the present invention is an integrated structure in which rectangular vehicle battery packs are integrated in the thickness direction, and includes frames attached to both sides in the width direction of each battery pack and extending in the length direction of the battery pack, columns provided in the vicinity of the four corners of the integrated battery packs and extending in the vertical direction, and a plurality of spacers attached to the columns at intervals in the vertical direction and to which the frames are fixed.

[0009] The method for integrating battery packs according to the present invention is a method for integrating rectangular vehicle battery packs in the thickness direction using columns provided at positions corresponding to the vertices of a rectangle in plan view and extending in the vertical direction, and spacers attached to the columns at intervals in the vertical direction. In this method, frames extending in the length direction of the battery pack are attached to both sides in the width direction of each battery pack, the battery pack is lifted using lifting holes formed in the frame, the battery pack is arranged between four of the columns, and the frame is fixed to the spacer.

Effects of the Invention

[0010] According to the present invention, an integrated structure for more compactly integrating a battery pack for a vehicle and a method for integrating the battery pack can be realized. As a result, by using such an integrated structure in a cubicle type high-voltage power receiving facility, the cubicle type high-voltage power receiving facility can be made more compact.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Embodiments for Carrying Out the Invention

[0012] Hereinafter, the present invention will be described by taking a cubicle type high-voltage power receiving facility as an example based on the drawings showing its embodiments.

[0013] FIG. 1 is an exemplary view showing an example of the high-voltage power receiving facility 100 according to the present embodiment. The high-voltage power receiving equipment 100 includes, inside a metal housing, a battery tray 200 that houses a storage battery and a power control panel C that houses a battery PCS (Power Conditioning System) (not shown). Further, for example, two integrated structures 1 in which a plurality of used battery packs for electric vehicles (EVs) are integrated are provided in the battery tray 200.

[0014] FIG. 2 is a front view of the integrated structure 1 of the high-voltage power receiving equipment 100 according to the present embodiment, FIG. 3 is a plan view of the integrated structure 1 of the high-voltage power receiving equipment 100, and FIG. 4 is a side view of the integrated structure 1 of the high-voltage power receiving equipment 100. As described above, in the integrated structure 1, a plurality of battery packs 300 are integrated at equal intervals in the thickness direction of the battery pack 300, that is, in the vertical direction.

[0015] As shown in FIG. 3, the battery pack 300 is substantially rectangular in plan view, and bracket plates 302 and 301 for fixing the battery pack 300 to a vehicle are provided on both sides in the width direction. The bracket plate 302 and the bracket plate 301 have different shapes from each other. The battery pack 300 has one bracket plate 302 and two bracket plates 301, and they are provided at a predetermined interval in the order of the bracket plate 302 and the bracket plate 301 from the front side. In the length direction, the bracket plate 302 and the bracket plate 301 are respectively provided at both ends of the battery pack 300, and the bracket plate 301 is provided at the middle portion.

[0016] Each bracket plate 301 has a flat plate shape that is substantially rectangular in plan view, and projects perpendicularly to the side surface of the battery pack 300 from the lower end of the side surface of the battery pack 300 in the width direction of the battery pack 300. Further, each bracket plate 301 has a through hole 301A.

[0017] The bracket plate 302 has a flat plate shape that is approximately trapezoidal in plan view, and projects perpendicularly from the lower end of the side surface of the battery pack 300 in the width direction of the battery pack 300. The dimension of the bracket plate 302 in the protruding direction is longer than that of the bracket plate 301. Further, the bracket plate 302 has a through hole 302A.

[0018] The integrated structure 1 includes four column members 10 respectively provided near the four corners of the integrated battery pack 300, two frame members 30 attached to both sides in the width direction of each battery pack 300 and extending in the length direction of the battery pack 300, and a plurality of spacer members 20 attached to the column members 10 with a vertical separation and to which the frame members 30 are fixed.

[0019] FIG. 5 is a front view, a plan view, a bottom view, and a side view showing the column member 10 of the integrated structure 1. FIG. 5A is a front view of the column member 10, FIG. 5B is a plan view of the column member 10, FIG. 5C is a bottom view of the column member 10, and FIG. 5D is a side view of the column member 10. For convenience, in FIG. 5, the middle part of the column member 10 is omitted from the illustration. Since each column member 10 has the same shape, only one column member 10 will be described below.

[0020] The column member 10 is made of metal, extends in the vertical direction, and has a substantially gutter shape. Each column member 10 has a gutter-shaped portion 10A to which the spacer member 20 is fixed. As shown in FIG. 3, each column member 10 is provided such that the gutter-shaped portion 10A is open outward in the width direction of the battery pack 300.

[0021] The gutter-shaped portion 10A has two opposing side walls 12, 13 and a bottom plate 11 interposed between the side walls 12, 13 and connecting the inner edges of the side walls 12, 13 to each other (see FIG. 3). In the longitudinal direction of the battery pack 300, the side walls 13 of the column members 10 face each other, and reinforcing portions 14 for enhancing the strength of the gutter-shaped portion 10A are continuously provided at the outer edges of the side walls 13 of each column member 10. The reinforcing portion 14 is in a strip shape and protrudes parallel to the bottom plate 11. The side walls 12, 13, the bottom plate 11, and the reinforcing portion 14 are integrally formed.

[0022] The bottom plate 11 is provided with a plurality of pairs of through holes 111 for fixing the spacer member 20, including a pair of through holes 111 formed at intervals in the longitudinal direction of the column member 10, that is, in the vertical direction. The through holes 111 are, for example, circular. The plurality of pairs of through holes 111 are formed at equal intervals in the vertical direction.

[0023] Among the plurality of pairs of through holes 111, the pair of through holes 111 formed at the uppermost position is formed at a distance from the upper end of the bottom plate 11 by a dimension slightly longer than the thickness of the battery pack 300. Also, among the plurality of pairs of through holes 111, the pair of through holes 111 formed at the lower end of the bottom plate 11 has an oval-shaped lower through hole 111A. Note that a plurality of circular through holes for fixing to other members are formed in the side walls 12, 13 and the reinforcing portion 14.

[0024] As shown in FIG. 3, among the four column members 10, a pair of column members 10 disposed on the end side in the longitudinal direction of the battery pack 300 face each other in the width direction of the battery pack 300. More specifically, in the pair of column members 10, the bottom plates 11 to which the spacer member 20 is fixed correspond to each other.

[0025] FIG. 6 is a front view, a plan view, and a side view showing the frame member 30 of the integrated structure 1. FIG. 6A is a front view of the frame member 30, FIG. 6B is a plan view of the frame member 30, and FIG. 6C is a side view of the frame member 30. For convenience, in FIG. 6, the middle part of the frame member 30 is omitted and shown. Since each frame member 30 has the same shape, hereinafter, only one frame member 30 will be described.

[0026] The frame member 30 is made of metal, extends in the horizontal direction, and has a substantially gutter shape. Each frame member 30 has a gutter-shaped mounting portion 30A to which the battery pack 300 (bracket plates 302, 301) is fixed. Each frame member 30 is provided such that the mounting portion 30A is open to the battery pack 300 side, as shown in FIG. 2.

[0027] The mounting portion 30A has two side walls 32, 33 (opposing walls) facing each other in the vertical direction, and a bottom plate 31 interposed between the side walls 32, 33 and connecting the outer edges of the side walls 32, 33 (see FIG. 2). A strip-shaped portion 34 extends upward at the upper end of the mounting portion 30A. That is, among the two side walls 32, 33, the strip-shaped portion 34 is continuously provided at the inner edge of the upper side wall 33 (upper opposing wall), and the strip-shaped portion 34 projects upward in parallel with the bottom plate 31. The side walls 32, 33, the bottom plate 31, and the strip-shaped portion 34 are integrally formed.

[0028] The side wall 32 (lower opposing wall) is strip-shaped and extends along the length direction of the battery pack 300, and the end of the inner side, that is, one side edge portion on the battery pack 300 side, is bent downward to increase the strength. Also, in the side wall 32, as described above, the bottom plate 31 extends perpendicularly to the side wall 32 to the side wall 33 at the other outer edge portion.

[0029] Further, through holes 320, 323 (fourth holes) for fixing to the spacer member 20 are formed at both ends in the length direction of the side wall 32. The through hole 323 is formed at one end portion closer to the front of the battery pack 300, and the through hole 320 is provided at the other end portion.

[0030] And through-holes 321 and 322 (first holes) for fixing the battery pack 300 are formed in the side wall 32. The through-holes 321 and 322 are formed at positions corresponding to the through-hole 301A of the bracket plate 301 of the battery pack 300 and the through-hole 302A of the bracket plate 302, respectively. The through-hole 321 is formed at a position slightly separated from the through-hole 320, and the through-hole 322 is formed in the vicinity of the through-hole 323. In other words, the through-hole 321 is formed near the one edge portion of the side wall 32, and the through-hole 322 is formed near the other edge portion of the side wall 32.

[0031] Also, on the upper surface of the side wall 32, at positions corresponding to the through-holes 321 and 322, collars 321A and 322A project respectively. The collars 321A and 322A are cylindrical in shape with an inner diameter the same as that of the through-holes 321 and 322, and are spacers interposed between the bracket plates 302 and 301 and the upper surface (through-holes 321 and 322) of the side wall 32, respectively.

[0032] The side wall 33 is strip-shaped and extends along the length direction of the battery pack 300 as shown in FIG. 3. The side wall 33 has a strip-shaped portion 34 continuously provided at one edge on the inner side, i.e., on the battery pack 300 side, and a bottom plate 31 continuously provided at the other edge on the outer side, as described above. Also, the side wall 33 has a dimension in the width direction shorter than that of the side wall 32. In other words, the side wall 32 projects toward the battery pack 300 side more than the side wall 33 (see FIG. 3).

[0033] In addition, three through-holes 331, 332, and 333 are formed in the side wall 33. They are formed in the order of the through-hole 333 (the fifth hole), the through-hole 332 (the third hole), and the through-hole 331 (the fifth hole) from the front side of the battery pack 300. The through-holes 331 and 333 are respectively formed at both ends of the side wall 33, and the through-hole 332 is formed in the vicinity of the through-hole 333. The through-holes 331, 332, and 333 are respectively formed at positions that are aligned with the through-holes 320, 322, and 323 of the side wall 32 in the vertical direction. The through-holes 331, 332, and 333 have the same dimensions and are circular with a diameter larger than that of the through-holes 320, 322, and 323 of the side wall 32.

[0034] As described above, the strip-shaped portion 34 is continuously provided at the one edge of the side wall 33 and protrudes upward in parallel with the bottom plate 31. Two through-holes 341 and 342 (the second holes) are formed in the strip-shaped portion 34. The through-holes 341 and 342 are respectively formed in the vicinity of the through-holes 322 and 321 of the side wall 32, that is, in the vicinity of the collars 322A and 321A. As will be described later, the through-holes 341 and 342 are used for lifting the battery pack 300.

[0035] FIG. 7 is a front view, a plan view, and a side view showing the spacer member 20 of the integrated structure 1. FIG. 7A is a front view of the spacer member 20, FIG. 7B is a plan view of the spacer member 20, and FIG. 7C is a side view of the spacer member 20. Since each spacer member 20 has the same shape, only one spacer member 20 will be described below.

[0036] As described above, the spacer member 20 is attached to the column member 10, and the frame member 30 is fixed to the spacer member 20. The spacer member 20 is made of metal.

[0037] The spacer member 20 has a rectangular plate portion 21 that is screwed to the bottom plate 11 of the column member 10. The rectangular plate portion 21 has a rectangular plate shape extending in the vertical direction, and the dimension in the width direction of the rectangular plate portion 21 is equal to or less than the width dimension of the bottom plate 11 of the column member 10. The rectangular plate portion 21 has two first through holes 211, the two first through holes 211 have the same dimensions, and are formed at intervals in the vertical direction.

[0038] From the upper edge of the rectangular plate portion 21 in the thickness direction of the rectangular plate portion 21, that is, on the side of the battery pack 300, a fixing plate portion 22 extends. The fixing plate portion 22 has a rectangular plate shape and has the same width dimension as the rectangular plate portion 21. Further, a second through hole 221 is formed in the central portion of the fixing plate portion 22. The second through hole 221 is circular and is used for fixing the frame member 30 as described later.

[0039] A triangular rib 23 is provided between the rectangular plate portion 21 and the fixing plate portion 22. Specifically, the triangular rib 23 has a triangular plate shape with a straight line connecting the protruding tip of the fixing plate portion 22 and the lower end of the rectangular plate portion 21 as the base. That is, the triangular rib 23 is formed from one long side of the rectangular plate portion 21 to one long side of the fixing plate portion 22 corresponding to the one long side. In other words, the triangular rib 23 is connected to the one long side of the rectangular plate portion 21 and the one long side of the fixing plate portion 22. Note that the rectangular plate portion 21, the fixing plate portion 22, and the triangular rib 23 are integrally formed.

[0040] In the integrated structure 1 according to the present embodiment having the above configuration, frame members 30 are respectively attached to both sides in the width direction of the battery pack 300, the spacer member 20 is attached to the column member 10, and both ends of the frame member 30 are respectively fixed to the two spacer members 20, whereby the battery packs 300 are integrated with the vertical direction as the thickness direction.

[0041] FIG. 8 is a diagram showing the attachment state of the frame member 30, the spacer member 20, and the column member 10 when the battery packs 300 are integrated. Next, based on FIGS. 2 to 8, the method of assembling the battery pack 300 will be described in detail.

[0042] First, a first operation of attaching the spacer member 20 to the column member 10 is performed (hereinafter, refer to FIGS. 2, 4, 5, 7, and 8). At this time, the four column members 10 are fixed in the housing of the high-voltage power receiving facility 100 so as to form a rectangle in plan view.

[0043] The two first through holes 211 of the rectangular plate portion 21 of the spacer member 20 are respectively aligned with any pair of through holes 111 of the column member 10, and the rectangular plate portion 21 of the spacer member 20 is applied to the bottom plate 11 of the column member 10 from the outside of the gutter-shaped portion 10A. In this state, bolts B are inserted into the through holes 111 of the bottom plate 11 and the first through holes 211 of the rectangular plate portion 21 from the inside of the gutter-shaped portion 10A and come out from the first through holes 211. Nuts N are fitted to the ends of the bolts B that have come out to complete the screwing. Such an operation is repeatedly performed for each column member 10 with respect to each pair of through holes 111.

[0044] As a result, as shown in FIG. 2, the spacer member 20 projects from the bottom plate 11 of each column member 10 toward the opposing column member 10. At this time, the fixing plate portions 22 of the respective spacer members 20 are substantially horizontal.

[0045] Next, a second operation of attaching the frame member 30 to the battery pack 300 is performed (hereinafter, refer to FIGS. 3, 6, and 8). The bracket plates 302 and 301 of the battery pack 300 are arranged inside the attachment portion 30A of the frame member 30. At this time, the through hole 301A of the bracket plate 301 is aligned with the position of the through hole 321 (collar 321A) of the frame member 30, and the through hole 302A of the bracket plate 302 is aligned with the position of the through hole 322 (collar 322A) of the frame member 30.

[0046] In such a state, the bolt B is inserted into the through hole 321 from the lower surface side of the side wall 32 of the frame member 30 (attachment portion 30A), passes through the collar 321A, and exits from the through hole 301A of the bracket plate 301. A nut N is fitted onto the end of the bolt B that has exited, and the screwing is completed.

[0047] Also, the bolt B is inserted into the through hole 322 from the lower surface side of the side wall 32 of the frame member 30 (attachment portion 30A), passes through the collar 322A, and exits from the through hole 302A of the bracket plate 302. A nut N is fitted onto the end of the bolt B that has exited, and the screwing is completed. Since the through hole 302A of the bracket plate 302 is disposed deeper inside the attachment portion 30A than the through hole 301A of the bracket plate 301, such nut N fitting work is performed using the through hole 332 of the side wall 33. By the second operation, the frame members 30 are attached to both sides of the battery pack 300.

[0048] Then, a third operation of fixing the frame member 30 to the spacer member 20 is performed (hereinafter, refer to FIGS. 2 and 3). As described above, in a state where the frame members 30 are respectively attached to both sides of the battery pack 300 by the second operation, the battery pack 300 with the frame member 30 is carried into the housing of the high-voltage power receiving facility 100 using a crane. Specifically, with the roof of the housing of the high-voltage power receiving facility 100 removed, the battery pack 300 with the frame member 30 is carried inside the rectangle defined by the four column members 10 from above such a housing.

[0049] Thus, when the crane carries the battery pack 300 with the frame member 30, the hook H of such a crane is respectively hung on the through holes 341 and 342 of the frame member 30 of the battery pack 300 as shown in FIG. 8. That is, the hook H of the crane is respectively hung on the four through holes 341 and 342 of the two frame members 30, and the battery pack 300 with the frame member 30 is lifted.

[0050] Thereafter, the battery pack 300 with the frame member 30, which has been lifted and carried between the four column members 10, has both ends of each frame member 30 fixed to the spacer members 20 respectively.

[0051] The battery pack 300 with the first frame member 30 is carried to the position of the lowermost spacer member 20. First, one end of the frame member 30 is aligned with the corresponding spacer member 20 of the column member 10 on the front side of the battery pack 300. That is, the through hole 323 at one end of the frame member 30 is aligned with the second through hole 221 of the fixed plate portion 22 of the corresponding spacer member 20. Next, the bolt B is inserted into the second through hole 221 from the lower surface side of the fixed plate portion 22 of the spacer member 20 and exits from the through hole 323 of the side wall 32 of the frame member 30 (attachment portion 30A). A nut N is fitted onto the end of the bolt B that has exited, and the screwing is completed. Since the through hole 323 of the frame member 30 is disposed on the back side of the attachment portion 30A as described above, such fitting operation of the nut N is performed using the through hole 333 of the side wall 33.

[0052] Next, the other end of the frame member 30 is also screwed in alignment with the corresponding spacer member 20 of the column member 10 on the back side of the battery pack 300 in the same manner as the one end. The fitting operation of the nut N during the screwing of the other end of the frame member 30 is performed using the through hole 331 of the side wall 33. Such fixing of the frame member 30 to the spacer member 20 is performed for the frame members 30 on both sides of the battery pack 300 respectively.

[0053] When the fixing of the battery pack 300 with the first frame member 30 is completed by the first operation to the third operation as described above, the battery pack 300 with the second frame member 30 is fixed to the second four spacer members 20 from the bottom, and the battery pack 300 with the third frame member 30 is fixed to the third four spacer members 20 from the bottom. By repeating the first operation to the third operation for each battery pack 300, the integration of the battery packs 300 is completed, and the integrated structure 1 of the high-voltage power receiving facility 100 according to the present invention is completed.

[0054] In the above, the case where the second operation is performed after the first operation has been described as an example, but it is not limited thereto, and the order of the first operation and the second operation may be reversed.

[0055] Since it has the configuration as described above, the integrated structure 1 according to the present embodiment can compactly integrate the battery packs 300 without using the assembly of a pallet, a shelf board, or a frame. Consequently, by adopting such an integrated structure 1, the compactification of the high-voltage power receiving facility 100 can also be realized.

[0056] Further, in the integrated structure 1 according to the present embodiment, as described above, with the frame member 30 attached to the battery pack 300, the hook H of the crane is hooked on the through holes 341 and 342 of the frame member 30 to lift the battery pack 300, so that the integration work of the battery pack 300 becomes easy.

[0057] Further, in the integrated structure 1 according to the present embodiment, as described above, at the frame member 30 (attachment portion 30A), the tip of the side wall 33 is retracted in a direction away from the battery pack 300 more than the tip of the side wall 32. As a result, a space is secured between the belt-shaped portion 34 of the frame member 30 to which the hook H of the crane is hooked and the battery pack 300 (see FIG. 8). Therefore, the work of hooking the hook H of the crane on the frame member 30 becomes easy, and the collision between the hook H of the crane and the battery pack 300 can be prevented.

[0058] Furthermore, in the integrated structure 1 according to the present embodiment, as described above, the through holes 331, 332, and 333 in the side wall 33 are circular with diameters larger than those of the through holes 320, 322, and 323 in the side wall 32, and are formed at positions that align with the through holes 320, 322, and 323 in the side wall 32 in the vertical direction. Therefore, when attaching the frame member 30 to the spacer member 20, the fitting operation of the nut N can be performed through the through holes 331 and 333, and when fixing the bracket plate 302 of the battery pack 300 to the frame member 30, the fitting operation of the nut N can be performed through the through hole 332, so that the workability can be improved.

[0059] In the above, in the integrated structure 1 according to the present embodiment, the case where six spacer members 20 are attached to each column member 10 has been described as an example, but the present invention is not limited to this, and the number of spacer members 20 can be increased or decreased as necessary.

[0060] The technical features (constituent elements) described in the present embodiment can be combined with each other, and new technical features can be conceived by combining them. The embodiments disclosed this time should be considered as illustrative in all respects and not restrictive. The scope of the present invention is shown not by the above meaning but by the scope of claims, and it is intended that all modifications within the meaning and scope equivalent to the scope of claims are included.

[0061] The independent claims and dependent claims described in the scope of claims can be combined with each other in all possible combinations regardless of the citation form. Furthermore, although the scope of claims uses a form (multi-claim form) of describing a claim that cites two or more other claims, the present invention is not limited to this. A form of describing a multi-claim (multi-multi-claim) that cites at least one multi-claim may be used.

Description of Reference Numerals

[0062] 1: Integrated structure, 10: Column member, 11: Bottom plate, 20: Spacer member, 21: Rectangular plate portion, 22: Fixed plate portion, 30: Frame member, 30A: Attachment portion, 32, 33: Side walls (opposing walls), 34: Band-shaped portion, 211: First through-hole, 221: Second through-hole, 300: Battery pack, 302, 301: Bracket plates, 320, 323: Through-holes (fourth holes), 321, 322: Through-holes (first holes), 332: Through-hole (third hole), 341, 342: Through-holes (second holes), 331, 333: Through-holes (fifth holes)

Claims

1. An integrated structure in which rectangular vehicle battery packs are stacked in the thickness direction, a frame attached to both sides in the width direction of each battery pack and extending in the length direction of the battery pack, columns provided near the four corners of the stacked battery packs and extending in the vertical direction, and a plurality of spacers attached to the columns at intervals in the vertical direction and to which the frame is fixed.

2. The frame has a first hole used for attachment to the battery pack, and a second hole used for lifting the battery pack. The integrated structure according to claim 1.

3. The frame has a trough-shaped attachment portion in which the first hole is formed and the battery pack side is open, and a strip-shaped portion formed with the second hole and extending upward from the upper edge of the attachment portion. The battery pack has bracket plates with through holes provided on both sides in the width direction, and the bracket plates are disposed inside the attachment portion of the frame and fixed to the attachment portion. The integrated structure according to claim 2.

4. Of the two opposing walls of the attachment portion facing each other in the vertical direction, the first hole is formed in the lower opposing wall, and a third hole is formed at a position corresponding to the first hole in the upper opposing wall. The integrated structure according to claim 3.

5. The frame has a fourth hole used for fixing to the spacer in the lower opposing wall, and a fifth hole is formed at a position corresponding to the fourth hole in the upper opposing wall. The integrated structure according to claim 4.

6. Each of the plurality of spacers has two first through holes formed at intervals in the vertical direction and is screwed to the column, and a rectangular plate portion, and a fixing plate portion protruding from the upper edge of the rectangular plate portion in the thickness direction of the rectangular plate portion and having a second through hole for screwing the frame. The integrated structure according to claim 1.

7. The column is in a trough shape extending in the vertical direction, and for a pair of columns provided on the end side in the longitudinal direction of the battery pack, the bottom plates to which the rectangular plate portions of the spacers are screwed face each other. The integrated structure according to claim 6.

8. A method for stacking battery packs for a rectangular vehicle, using columns that are respectively provided at positions corresponding to the vertices of a rectangle in a plan view and extend in the vertical direction, and spacers that are attached to the columns with a vertical separation, to stack the battery packs in the thickness direction. Attach frames that extend in the length direction of the battery pack to both sides in the width direction of each battery pack. Lift the battery pack using the lifting holes formed in the frame. Place the battery pack between the four columns. Fix the frame to the spacer. A method for stacking battery packs.

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