Power storage device

Abstract

To provide a power storage device capable of miniaturizing a fastening pedestal for fastening a bus bar electrically connected to a power storage cell.SOLUTION: A power storage device 1 includes: a plurality of power storage cells 10 arranged in an X direction; a bus bar 20 electrically connecting the power storage cells 10 with each other arranged in the X direction; a bolt 50; and a plurality of fastening pedestals 30 which each are provided with a nut 40 that is fastened to the bus bar 20 by the bolt 50. The plurality of fastening pedestals 30 are arranged in the X direction. The plurality of fastening pedestals 30 each include recesses (323, 324, 343) and held portions (313, 333, 353). The plurality of fastening pedestals 30 are arranged such that the held portions (313, 333) of one of fastening pedestals 30 adjacent in the X direction are held by the recesses (323, 324, 343) of the other of the fastening pedestals 30.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to an electricity storage device. [Background technology]

[0002] JP 2020-087721 A (Patent Document 1) discloses a battery pack including battery cells stacked in a stacking direction and a holding member that holds voltage detection terminals. The holding member extends in the stacking direction. The holding member is provided with a plurality of voltage detection terminals that are arranged at intervals in the stacking direction, and each voltage detection terminal has a fastening hole formed therein. Each fastening hole is disposed between one positive terminal and the other negative terminal of two adjacent battery cells. A positive fastening terminal is welded to the positive terminal, and a negative fastening terminal is welded to the negative terminal. The positive fastening terminal and the negative fastening terminal are fastened together by a fastening bolt inserted into the fastening hole. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-087721 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned Patent Document 1, when the positive fastening terminal (bus bar) and the negative fastening terminal (bus bar) are fastened together by the fastening bolt, the rotational torque applied to the fastening bolt may cause damage to the voltage detection terminal (fastening base) or cause it to become misaligned. To prevent this, it is conceivable to increase the size of the voltage detection terminal, for example, by giving the voltage detection terminal a certain thickness or more. However, this would cause inconveniences such as an increase in the size of the power storage device.

[0005] The present disclosure has been made to solve the above-mentioned problems, and its purpose is to provide an energy storage device that allows for a reduction in the size of a fastening base for fastening a bus bar that is electrically connected to a storage cell. [Means for solving the problem]

[0006] According to one aspect of the present disclosure, there is provided an energy storage device including a plurality of energy storage cells arranged in an arrangement direction, a bus bar electrically connected to each of the plurality of energy storage cells, a fastening member, and a plurality of fastening pedestals each having a fastened portion fastened to the bus bar by the fastening member. The plurality of fastening pedestals are arranged in the arrangement direction. Each of the plurality of fastening pedestals has at least one of a pedestal-side holding portion and a held portion. The plurality of fastening pedestals are arranged such that the held portion of one of the plurality of fastening pedestals adjacent in the arrangement direction is held by the pedestal-side holding portion of the other of the fastening pedestals.

[0007] In the energy storage device according to one aspect of the present disclosure, as described above, the held portions of one of the fastening pedestals adjacent in the arrangement direction are held by the pedestal-side holding portion of the other of the fastening pedestals. This allows the adjacent fastening pedestals to be held together, thereby preventing damage and misalignment of the fastening pedestals due to the rotational torque of the fastening members without increasing the size of the fastening pedestals, such as by increasing the thickness of the fastening pedestals themselves. This allows for the downsizing of the fastening pedestals used to fasten the bus bars that electrically connect the energy storage cells to each other.

[0008] Each of the multiple fastening pedestals may extend in a transverse direction intersecting the arrangement direction and include a first end in the transverse direction where a pedestal-side holding portion is provided, and a second end in the transverse direction opposite the first end where a held portion is provided. The multiple fastening pedestals may be arranged so that the first end and the second end are alternately arranged in the arrangement direction. With this configuration, the held portion is held by the pedestal-side holding portion at both ends in the transverse direction, thereby further reducing damage and displacement of the fastening pedestal caused by the rotational torque of the fastening member.

[0009] The held portion may include a holding portion that holds the fastened portion and a protruding portion that protrudes in the arrangement direction. The base-side holding portion may include a recess in which the protruding portion is disposed. With this configuration, the protruding portion and the recess can be engaged by disposing the protruding portion in the recess. As a result, the held portion can be easily held by the base-side holding portion.

[0010] Each of the multiple fastening pedestals may include a connection portion that connects the first end and the second end and is arranged between the storage cells arranged in the arrangement direction. This configuration makes it easier to handle the fastening pedestal compared to when the first end and the second end are independent of each other, and simplifies the configuration of the storage device by reducing the number of parts in the storage device. Furthermore, since the connection portion is arranged between the storage cells, the connection portion (fastening pedestal) can be made smaller than when the connection portion is routed around the outside of the storage cells. As a result, the storage device can be made smaller.

[0011] The energy storage device may include an end plate provided on one side of the plurality of energy storage cells in the arrangement direction. The end plate may include a plate-side holding portion that holds a held portion of a fastening base provided at an end of one of the plurality of fastening bases in the arrangement direction. With this configuration, the end plate can easily prevent damage or displacement of the fastening base at the end caused by the rotational torque of the fastening member. [Effects of the Invention]

[0012] According to the present disclosure, it is possible to reduce the size of the fastening base for fastening the bus bar electrically connected to the energy storage cell. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a perspective view illustrating a configuration of an electricity storage device according to an embodiment. [Figure 2]FIG. 1 is a plan view illustrating a configuration of a storage cell according to an embodiment. [Figure 3] FIG. 2 is a plan view schematically illustrating a plurality of energy storage cells and a fastening base according to one embodiment. [Figure 4] FIG. 10 is a side view illustrating a configuration of multiple fastening seats according to one embodiment. [Figure 5] FIG. 4 shows the state in which the busbar is attached. [Figure 6] FIG. 2 is a partially enlarged perspective view showing a detailed configuration of the electricity storage device according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0014] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

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

[0015] An electricity storage device 1 according to an embodiment of the present disclosure will be described with reference to Figures 1 to 6. Figure 1 is a perspective view showing the electricity storage device 1 according to this embodiment. The electricity storage device 1 is mounted on, for example, a hybrid electric vehicle (Hybrid Electric Vehicle), a plug-in hybrid electric vehicle (Plug-in Hybrid Electric Vehicle), an electric vehicle (Battery Electric Vehicle), etc. Note that the use of the electricity storage device 1 is not limited to vehicle use.

[0016] In this specification, the X direction, Y direction, and Z direction are directions that are perpendicular to each other. For example, the X direction and Y direction are the front-to-rear direction and the width direction of the vehicle when the power storage device 1 is mounted on the vehicle. The X1 direction and X2 direction are the front and rear of the vehicle, respectively. The Y1 direction and Y2 direction are the right and left sides of the vehicle, respectively. The Z direction is the up-down (vertical) direction. The X direction and Y direction are examples of the "arrangement direction" and "intersecting direction" of the present disclosure, respectively.

[0017] The energy storage device 1 includes a plurality of (two in this embodiment) energy storage stacks 100, an intermediate plate 110, end plates 120, restraint bands 130, and brackets 140. Each of the intermediate plate 110 and the end plates 120 may be formed of, for example, metal or high-strength resin.

[0018] The two power storage stacks 100 are arranged side by side in the X direction. The intermediate plate 110 is sandwiched between the two power storage stacks 100 in the X direction. The two power storage stacks 100 have the same configuration.

[0019] The end plates 120 are provided on the X1 side of the X1-side power storage stack 100 and on the X2 side of the X2-side power storage stack 100. The end plates 120 are adjacent to each power storage stack 100 in the X direction.

[0020] The restraint bands 130 restrain the two power storage stacks 100. The restraint bands 130 restrain the two power storage stacks 100 so as to maintain a distance between the two power storage stacks 100. The restraint bands 130 are fastened to each of the end plate 120 on the X1 side and the end plate 120 on the X2 side by bolts 131.

[0021] A bracket 140 is provided on each of the two electricity storage stacks 100. The bracket 140 is engaged with a vehicle (not shown), thereby holding the electricity storage device 1 on the vehicle. The bracket 140 is fastened to each of the end plate 120 on the X1 side and the end plate 120 on the X2 side by bolts 141.

[0022] The power storage stack 100 includes a plurality of power storage cells 10. The plurality of power storage cells 10 are arranged in the X direction.

[0023] 2 is a perspective view showing the configuration of the energy storage cell 10. The energy storage cell 10 is formed long in the Y direction. The energy storage cell 10 has a short side surface 11, a short side surface 12, two positive electrode terminals 13, and two negative electrode terminals 14.

[0024] The short side surface 11 and the short side surface 12 are surfaces that face each other in the Y direction. Two positive electrode terminals 13 are arranged on the short side surface 11. The positive electrode terminals 13 include a positive electrode terminal 13a arranged at the upper end of the short side surface 11 and a positive electrode terminal 13b arranged at the lower end of the short side surface 11. Two negative electrode terminals 14 are arranged on the short side surface 12. The negative electrode terminals 14 include a negative electrode terminal 14a arranged at the upper end of the short side surface 12 and a negative electrode terminal 14b arranged at the lower end of the short side surface 12.

[0025] 3 is a plan view schematically illustrating a plurality of storage cells 10. The plurality of storage cells 10 are arranged such that storage cells 10 whose short side surfaces 11 face the Y1 side and storage cells 10 whose short side surfaces 12 face the Y1 side are alternately arranged in the X direction.

[0026] The energy storage device 1 includes a plurality of bus bars 20. The bus bars 20 are electrically connected to the positive electrode terminal 13 and the negative electrode terminal 14 of each energy storage cell 10. The bus bars 20 of the energy storage cells 10 aligned (adjacent) in the X direction are electrically connected to each other.

[0027] In each storage cell 10, a bus bar 20 is connected to either one of the positive electrode terminal 13a and the positive electrode terminal 13b arranged on the short side surface 11, and to either one of the negative electrode terminal 14a and the negative electrode terminal 14b arranged on the short side surface 12. The bus bar 20 connects the positive electrode terminal 13a of one of the two storage cells 10 aligned in the X direction to the negative electrode terminal 14a of the other. The bus bar 20 also connects the positive electrode terminal 13b of one of the two storage cells 10 aligned in the X direction to the negative electrode terminal 14b of the other.

[0028] Specifically, the positive electrode terminal 13b arranged on the short side surface 11 of the first storage cell 10 (reference numeral 10A in FIG. 3) and the negative electrode terminal 14b arranged on the short side surface 12 of the second storage cell 10 (reference numeral 10B in FIG. 3) adjacent to the first storage cell 10 are electrically connected by the bus bar 20. Furthermore, the positive electrode terminal 13a arranged on the short side surface 11 of the second storage cell 10 (10B) and the negative electrode terminal 14a arranged on the short side surface 12 of the third storage cell 10 (reference numeral 10C in FIG. 3) adjacent to the second storage cell 10 (10B) are electrically connected by the bus bar 20. In this way, the plurality of storage cells 10 are electrically connected in series.

[0029] The connection portion between the positive electrode terminal 13a and the negative electrode terminal 14a and the connection portion between the positive electrode terminal 13b and the negative electrode terminal 14b are arranged side by side in the X direction.

[0030] The energy storage device 1 includes a plurality of fastening pedestals 30 arranged in the X direction. The plurality of fastening pedestals 30 include a fastening pedestal 31, a fastening pedestal 32, a fastening pedestal 33, a fastening pedestal 34, and a fastening pedestal 35. For the sake of simplicity, only one of each of the fastening pedestals 31 to 34 is shown in FIG. 3, but in reality, a plurality of each of the fastening pedestals 31 to 34 is provided.

[0031] Each of the plurality of fastening seats 30 is formed of, for example, a resin. Each of the plurality of fastening seats 30 is formed of an insulating resin.

[0032] The fastening base 31 includes an end 310, an end 311, and a connection portion 312. The end 310 is the end of the fastening base 31 on the Y2 side. The end 311 is the end of the fastening base 31 on the Y1 side. The connection portion 312 connects the end 310 and the end 311. The connection portion 312 is provided in the gap G between adjacent energy storage cells 10. The end 310 is provided to protrude from the gap G on the Y2 side. The end 311 is provided to protrude from the gap G on the Y1 side. The end 310 and the end 311 are examples of the "second end" and the "first end" of the present disclosure, respectively.

[0033] The fastening base 32 includes an end 320, an end 321, and a connecting portion 322. The end 320 is the end of the fastening base 32 on the Y2 side. The end 321 is the end of the fastening base 32 on the Y1 side. The connecting portion 322 connects the end 320 and the end 321. The connecting portion 322 is provided in the gap G between adjacent energy storage cells 10. The end 320 is provided to protrude from the gap G on the Y2 side. The end 321 is provided to protrude from the gap G on the Y1 side. The end 320 and the end 321 are examples of a "first end" and a "second end" in the present disclosure, respectively.

[0034] The fastening base 33 includes an end 330, an end 331, and a connection portion 332. The end 330 is the end of the fastening base 33 on the Y2 side. The end 331 is the end of the fastening base 33 on the Y1 side. The connection portion 332 connects the end 330 and the end 331. The connection portion 332 is provided in the gap G between adjacent energy storage cells 10. The end 330 is provided to protrude from the gap G on the Y2 side. The end 331 is provided to protrude from the gap G on the Y1 side. The end 330 and the end 331 are examples of the "second end" and the "first end" of the present disclosure, respectively.

[0035] The fastening base 34 includes an end 340, an end 341, and a connecting portion 342. The end 340 is the end of the fastening base 34 on the Y2 side. The end 341 is the end of the fastening base 34 on the Y1 side. The connecting portion 342 connects the end 340 and the end 341. The connecting portion 342 is provided in the gap G between adjacent energy storage cells 10. The end 340 is provided to protrude from the gap G on the Y2 side. The end 341 is provided to protrude from the gap G on the Y1 side. The end 340 and the end 341 are examples of the "first end" and the "second end" of the present disclosure, respectively.

[0036] The fastening base 35 includes an end 350, an end 351, and a connection portion 352. The end 350 is the end of the fastening base 35 on the Y2 side. The end 351 is the end of the fastening base 35 on the Y1 side. The connection portion 352 connects the end 350 and the end 351. The connection portion 352 is provided in the gap G between adjacent energy storage cells 10. The end 350 is provided to protrude from the gap G on the Y2 side. The end 351 is provided to protrude from the gap G on the Y1 side. The end 350 and the end 351 are examples of the "second end" and the "first end" of the present disclosure, respectively.

[0037] The end portions 310, 320, 330, 340, and 350 may be arranged in the X direction closely packed together (closely attached) so that no gaps are formed between them.

[0038] Here, it is conceivable that the rotational torque applied to the fastening bolts when fastening the bus bars together may cause damage to the fastening base, misalignment, etc. To address this issue, it is conceivable to increase the size of the fastening base, for example, by making the fastening base thicker than a certain amount. However, this would result in inconveniences such as an increase in the size of the energy storage device.

[0039] Therefore, in this embodiment, the multiple fastening pedestals 30 are arranged so that one of the fastening pedestals 30 adjacent to each other in the X direction is held by the other. Details will be described with reference to Fig. 4 and the like.

[0040] 4 is a partially enlarged side view of the energy storage device 1 as seen from the Y2 side. For simplification, bus bars 20 are not shown in FIG.

[0041] 4, multiple sets are arranged in the X direction, each set consisting of fastening base 31 (310), fastening base 32 (320), fastening base 33 (330), and fastening base 34 (340) arranged in this order from the X1 side. Fastening base 35 (350) is arranged between the multiple sets and end plate 120.

[0042] A held portion 313 is provided on the end portion 310 of the fastening base 31. The held portion 313 includes a nut holding portion 314 and a protruding portion 315. The nut 40 is held in the nut holding portion 314. The nut holding portion 314 has a cylindrical shape in which the nut 40 is placed (housed). The protruding portion 315 protrudes (projects) from the nut holding portion 314 toward the X2 side. The nut holding portion 314 and the nut 40 are examples of a "holding portion" and a "fastened portion" of the present disclosure, respectively.

[0043] The nut holding portion 314 is disposed above a central position P in the Z direction of the energy storage cell 10 (FIG. 3).

[0044] The end portion 310 is provided with a shielding plate 316 and a shielding plate 317. The shielding plate 316 extends upward from the nut holding portion 314. The shielding plate 316 is provided so as to shield the positive electrode terminal 13a exposed from a hole 325 (described later) of the fastening base 32 (end portion 320) and the negative electrode terminal 14a exposed from a hole 345 (described later) of the fastening base 34 (end portion 340).

[0045] The shielding plate 317 extends downward from the nut holding portion 314. The shielding plate 317 is provided so as to shield the negative electrode terminal 14b exposed from a hole 326 (described later) of the fastening base 32 (end portion 320) and the positive electrode terminal 13b exposed from a hole 344 (described later) of the fastening base 34 (end portion 340).

[0046] End 320 of fastening base 32 is formed with recessed portion 323 and recessed portion 324. Recessed portion 323 has protruding portion 315 arranged therein, protruding from end 310 toward end 320. Protruding portion 315 engages with recessed portion 323. Recessed portion 324 has protruding portion 335 (described later) arranged therein, protruding from end 330 toward end 320. Note that recessed portion 323 and recessed portion 324 are examples of the "base-side holding portion" of the present disclosure.

[0047] The end portion 320 has holes 325 and 326 formed therein. The hole 325 is formed at the upper end of the end portion 320 on the X1 side. The hole 326 is formed at the lower end of the end portion 320 on the X2 side. In the example shown in FIG. 4, the positive electrode terminal 13a is exposed from the hole 325. Furthermore, the negative electrode terminal 14b is exposed from the hole 326. That is, the hole 325 and the hole 326 expose the electrode terminals (13a, 14b) of the two storage cells 10 adjacent in the X direction.

[0048] A held portion 333 is provided at the end 330 of the fastening base 33. The held portion 333 includes a nut holding portion 334 and a protruding portion 335. The nut 40 is held in the nut holding portion 334. The nut holding portion 334 has a cylindrical shape in which the nut 40 is placed (housed). The protruding portion 335 protrudes (projects) from the nut holding portion 334 to both the X1 side and the X2 side. The nut holding portion 334 is an example of a "holding portion" in the present disclosure.

[0049] The nut holding portion 334 is disposed below a central position P in the Z direction of the energy storage cell 10 (FIG. 3).

[0050] The end portion 330 is provided with a shielding plate 336 and a shielding plate 337. The shielding plate 336 extends upward from the nut holding portion 334. The shielding plate 336 is provided so as to shield the positive electrode terminal 13a exposed from the hole 325 of the fastening base 32 (end portion 320) and the negative electrode terminal 14a exposed from the hole 345 (described later) of the fastening base 34 (end portion 340).

[0051] The shielding plate 337 extends downward from the nut holding portion 334. The shielding plate 337 is provided so as to shield the negative electrode terminal 14b exposed from the hole 326 of the fastening base 32 (end portion 320) and the positive electrode terminal 13b exposed from the hole 344 (described later) of the fastening base 34 (end portion 340).

[0052] A recess 343 is formed in the end 340 of the fastening base 34. A protruding portion 335 that protrudes from the end 330 toward the end 340 is disposed in the recess 343. The protruding portion 335 is engaged with the recess 343. The recess 343 is an example of a "base-side holding portion" of the present disclosure.

[0053] The end portion 340 has holes 344 and 345 formed therein. The hole 344 is formed at the lower end of the end portion 340 on the X1 side. The hole 345 is formed at the upper end of the end portion 340 on the X2 side. In the example shown in FIG. 4, the positive electrode terminal 13b is exposed from the hole 344. The negative electrode terminal 14a is exposed from the hole 345. That is, the hole 344 and the hole 345 expose the electrode terminals (13b, 14a) of the two storage cells 10 adjacent in the X direction.

[0054] A held portion 353 is provided at an end 350 of the fastening base 35. The held portion 353 includes a nut holding portion 354 and a held portion 355. The nut 40 is held in the nut holding portion 354. The nut holding portion 354 has a cylindrical shape in which the nut 40 is placed (housed). The held portion 355 has a plate-like shape extending upward from the nut holding portion 354. The nut holding portion 354 is an example of a "holding portion" in the present disclosure.

[0055] The nut holding portion 354 is disposed above a central position P in the Z direction of the energy storage cell 10 (FIG. 3). That is, the nut holding portions 314, 334, and 354 are disposed in a staggered pattern.

[0056] The end plate 120 includes a holding portion 121 that holds the held portion 353 of the fastening base 35. Specifically, the holding portion 121 holds the held portion 355. The holding portion 121 is provided so as to protrude toward the Y2 side from a side surface 122 on the Y2 side of the end plate 120. As a result, the holding portion 121 is disposed so as to be adjacent to the held portion 355 on the X2 side of the held portion 355. The holding portion 121 is an example of a "plate-side holding portion" in the present disclosure.

[0057] Although not shown, the end portion on the Y2 side of the energy storage device 1 is configured similarly to the end portion on the Y1 side (the configuration in FIG. 4). Specifically, the end portion 311 of the fastening base 31, the end portion 331 of the fastening base 33, and the end portion 351 of the fastening base 35 (FIG. 3) each have a recess formed therein that holds the protruding portion of the adjacent fastening base, similar to the recesses (323, 324, 343) described above. Furthermore, the end portion 321 of the fastening base 32 and the end portion 341 of the fastening base 34 (FIG. 3) each have a protruding portion that holds the recess of the adjacent fastening base, similar to the protruding portion (315, 335, 355) described above, and a nut holding portion similar to the nut holding portion (314, 334, 354) described above. Note that the end portion 351 does not necessarily have to have a recess. The nut holding portion of fastening base 32 and one of the nut holding portions of fastening base 34 are respectively disposed above and below position P. In addition, end portion 321 of fastening base 32 and end portion 341 of fastening base 34 are each provided with a shielding plate similar to the above-described shielding plates (316, 317, 336, 337).

[0058] Although not shown, the fastening base 30 adjacent to the intermediate plate 110 (FIG. 1) may be configured to be held by the intermediate plate 110 in the same manner as the end plate 120 and the fastening base 35.

[0059] Fig. 5 shows a state in which bus bars 20 are fastened together by nuts 40 and bolts 50 in Fig. 4. The bolts 50 fasten the nuts 40 (Fig. 4) held by the nut holders 314 of the end portions 310 to the bus bars 20 joined to the negative electrode terminal 14a exposed at the end portions 340 and the bus bars 20 joined to the positive electrode terminal 13a exposed at the end portions 320. The bolts 50 are an example of the "fastening member" of the present disclosure.

[0060] In addition, bolt 50 fastens nut 40 (FIG. 4) held by nut holding portion 334 of end portion 330 to bus bar 20 connected to negative electrode terminal 14b exposed at end portion 320 and bus bar 20 connected to positive electrode terminal 13b exposed at end portion 340.

[0061] The bolt 50 fastens the nut 40 (FIG. 4) held by the nut holding portion 354 of the end portion 350 to the negative electrode terminal 14a exposed at the end portion 340.

[0062] 6 is a partially enlarged perspective view showing the configuration of the energy storage device 1. In FIG. 6, the bus bars 20 are removed from some of the nuts 40.

[0063] 6, busbar 20 is bent (90 degrees) into an L-shape to connect electrode terminals (13, 14) and nuts 40. Ends 21 of two busbars 20 are overlapped with each other at positions where they overlap with nuts 40, and the overlapped ends 21 are fastened (co-fastened) to nuts 40 by bolts 50.

[0064] The energy storage device 1 includes a plurality of heat insulating members 60. The heat insulating members 60 are arranged in gaps G (FIG. 3) between adjacent energy storage cells 10. Specifically, one heat insulating member 60 is arranged for every four energy storage cells 10. The heat insulating members 60 are arranged in the gaps G where the connection portions 312 of the fastening bases 31 are arranged.

[0065] As described above, in the above embodiment, the multiple fastening pedestals 30 are arranged so that the retained portions (313, 333) of one of the fastening pedestals 30 adjacent to each other in the X direction are retained by the recessed portions (323, 324, 343) of the other of the fastening pedestals 30. As a result, even if the width (width in the X direction) of the fastening pedestals 30 is reduced, the force with which the recessed portions retain the retained portions can prevent damage or displacement of the fastening pedestals 30 due to the rotational torque generated when the bolt 50 is fastened. Therefore, the fastening pedestals 30 can be made thinner, and the energy storage device 1 can be made smaller. As a result, the space around the energy storage device 1 can be increased.

[0066] In the above embodiment, an example has been shown in which each of the multiple fastening bases 30 has a recess (base-side holding portion) formed at one end and a protrusion (held portion) provided at the other end, but the present disclosure is not limited to this. Each of the recess and the protrusion may be formed at one end of the fastening base.

[0067] In the above embodiment, an example was shown in which each of the fastening pedestals 31 to 34 has a protruding portion formed thereon to be held in a recessed portion, but the present disclosure is not limited to this. Each fastening pedestal may be provided with a held portion having a shape other than a protruding portion (for example, a plate-like portion extending in the vertical direction). In this case, the pedestal-side holding portion that holds the held portion may be something other than a recessed portion (for example, a plate-like portion extending in the vertical direction).

[0068] In the above embodiment, an example has been shown in which both ends of each fastening base in the Y direction are connected to the connection portion, but the present disclosure is not limited to this. The both ends may be separated from each other.

[0069] In the above embodiment, an example has been shown in which the holding structure made of the protruding portion and the recessed portion is provided at both ends of the power storage device in the Y direction, but the present disclosure is not limited to this. The holding structure may be provided at only one end of the power storage device in the Y direction.

[0070] In the above embodiment, an example has been shown in which the fastening base 35 held by the end plate 120 is not provided with a protruding portion having a shape extending in the X direction, but the present disclosure is not limited to this. The fastening base 35 may be provided with a protruding portion extending in the X direction, and the end plate may be formed with a recess in which the protruding portion is to be disposed.

[0071] In the above embodiment, an example was shown in which the end 350 of the fastening base 35 does not have a protruding portion disposed in the recess of the adjacent fastening base, but the present disclosure is not limited to this. The end 350 may have the protruding portion.

[0072] The configurations of the above-described embodiment and the above-described modifications may be combined with each other.

[0073] It should be noted that the embodiments disclosed herein are illustrative in all respects and should not be considered limiting. The scope of the present disclosure is defined by the claims rather than the description of the above embodiments, and further includes all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0074] 1 Energy storage device, 10 Energy storage cell, 20 Bus bar, 30, 31, 32, 33, 34, 35 Fastening base, 40 Nut (fastened portion), 50 Bolt (fastening member), 120 End plate, 121 Holding portion (plate side holding portion), 310, 330, 350 End (second end), 311, 331, 351 End (first end), 312, 322, 332, 342, 352 Connection portion, 314, 334, 354 Nut holding portion (holding portion), 315, 335, 355 Holdable portion, 320, 340 End (first end), 321, 341 End (second end), 313, 333, 353 Holdable portion, 323, 324, 343 Recess (base side holding portion).

Claims

1. A plurality of storage cells arranged in an arrangement direction; a bus bar electrically connected to each of the plurality of power storage cells; A fastening member; a plurality of fastening seats provided with fastened portions to be fastened to the bus bars by the fastening members, The plurality of fastening seats are arranged in the arrangement direction, Each of the plurality of fastening pedestals has at least one of a pedestal-side holding portion and a held portion, The multiple fastening bases are arranged so that the held portion of one of the multiple fastening bases adjacent to each other in the arrangement direction is held by the base-side holding portion of the other of the fastening bases, in an energy storage device.

2. Each of the plurality of fastening seats is extending in a cross direction crossing the arrangement direction, a first end portion in the intersecting direction where the base side holding portion is provided; The held portion is provided and includes a second end portion in the intersecting direction opposite to the first end portion, The power storage device according to claim 1 , wherein the plurality of fastening bases are arranged such that the first end portions and the second end portions are alternately arranged in the arrangement direction.

3. The held portion includes a holding portion that holds the fastened portion and a protruding portion that protrudes in the arrangement direction, The power storage device according to claim 2 , wherein the base-side holding portion includes a recess in which the protruding portion is disposed.

4. 4. The energy storage device according to claim 2, wherein each of the plurality of fastening bases includes a connection portion that connects the first end and the second end and is arranged between the energy storage cells aligned in the arrangement direction.

5. an end plate provided on one side of the plurality of storage cells in the arrangement direction, The end plate includes a plate-side holding portion that holds the held portion of a fastening base that is provided at one end of the plurality of fastening bases in the arrangement direction.

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