Energy storage device

Abstract

To provide a power storage device capable of suppressing the influence of a force on the connection between a bus bar and a power storage element when the force is applied to an electric wire.SOLUTION: A power storage device includes: a plurality of power storage elements 10 aligned in a first direction; an edge member 30 aligned with the plurality of power storage elements 10 in the first direction; a bus bar holding member 7 holding at least one bus bar conducting the power storage elements 10 together, the bus bar holding member extending in the first direction along the plurality of power storage elements 10; and an electric wire disposed along the bus bar holding member 7 and protruding from one edge of the bus bar holding member 7 in the first direction. The bus bar holding member 7 has a first fixing part 761 which is disposed at one edge in the first direction and to which the electric wire is fixed, and a second fixing part 765 fixed to the edge member 30.SELECTED DRAWING: Figure 8

Description

Technical Field

[0001] The present invention relates to a power storage device including a plurality of power storage elements.

Background Art

[0002] Conventionally, a power supply device including a bus bar module in which electric wires are arranged has been known (see Patent Document 1). Specifically, as shown in FIGS. 16 and 17, this power supply device 500 includes a battery assembly 502 having a plurality of batteries 501, a bus bar module 503 attached to the battery assembly 502, and an electric wire 509 connected to a predetermined battery 501.

[0003] Each of the plurality of batteries 501 includes a cubic battery main body 510, and a positive electrode 511 and a negative electrode 512 that protrude in the same direction from one end face 510a of the battery main body 510.

[0004] The bus bar module 503 includes a plurality of bus bars and a synthetic resin plate 504 that houses them. This plate 504 includes a plate main body 505 formed in a flat plate shape and overlaid on the upper surface 502a of the battery assembly 502, a plurality of first housing portions 506 that house each bus bar, and an electric wire holding portion 507 that holds the electric wire 509.

[0005] Each bus bar is fitted into each first housing portion 506 of the plate 504, and is connected to each battery 501 by screwing a nut 530 onto the positive electrode 511 and the negative electrode 512 of each battery 501 of the battery assembly 502 passed through each hole of each bus bar. Thereby, the plate 504 is fixed to the battery assembly 502 via the bus bar.

[0006] Also, the electric wire holding portion 507 is provided on the plate 504 of the bus bar module 503, and fixes the electric wire 509 to the plate 504 by sandwiching and holding the electric wire 509.

[0007] In the power supply device 500 described above, the busbar module 503 is fixed to the battery assembly 502 by connecting each of the multiple busbars to either the positive terminal 511 or the negative terminal 512 of each battery 501. Therefore, when connecting or wiring the electric wire 509 to external equipment, if a force is applied to the electric wire 509 in a direction that moves the busbar module 503 away from the battery assembly 502, the plate 504 will try to move away from the battery assembly 502 due to the electric wire 509 being fixed to the plate 504 by the electric wire holder 507. At this time, a force is applied (stress tends to concentrate) to the connection point between the busbar fitted into the first housing portion 506 of the plate 504 and each battery 501 that makes up the battery assembly 502, and as a result, the connection point is prone to damage. In other words, in the power supply device 500, when force was applied to the electric wire 509, the effect of that force was easily transmitted to the connection point between the busbar and the battery 501. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Special Publication No. 2014-503934 [Overview of the Initiative] [Problems that the invention aims to solve]

[0009] Therefore, the objective of this embodiment is to provide an energy storage device that can suppress the effect of force applied to the power line on the connection point between the busbar and the energy storage element. [Means for solving the problem]

[0010] The energy storage device of this embodiment is Multiple energy storage elements arranged in the first direction, An end member arranged in the first direction, along with the plurality of energy storage elements, A busbar holding member that holds at least one busbar that connects the energy storage elements electrically, and extends in the first direction along the plurality of energy storage elements, The system comprises a wire arranged along the busbar holding member and protruding from one end of the busbar holding member in the first direction, The busbar holding member is A first fixing part is provided at one end of the first direction and to which the electric wire is fixed, It has a second fixing part that is fixed to the end member. [Effects of the Invention]

[0011] Based on the above, this embodiment provides an energy storage device that can suppress the effect of force applied to the power line on the connection point between the busbar and the energy storage element. [Brief explanation of the drawing]

[0012] [Figure 1] Figure 1 is a perspective view of the energy storage device according to this embodiment. [Figure 2] Figure 2 is an exploded perspective view of the main body and plate portion of the energy storage device. [Figure 3] Figure 3 is a view of the energy storage device from the X-axis direction. [Figure 4] Figure 4 is a view of the energy storage device from the Z-axis direction, showing the device with some of the multiple cover portions of the plate portion omitted. [Figure 5] Figure 5 is an exploded perspective view of the main body of the device, with some components omitted. [Figure 6] Figure 6 is an exploded perspective view of the end member of the energy storage device. [Figure 7] Figure 7 is an exploded perspective view of the end member. [Figure 8] Figure 8 is a cross-sectional view of the end of the energy storage device in the X-axis direction at position VIII-VIII in Figure 3. [Figure 9] Figure 9 is a view of the plate portion from the Z-axis direction. [Figure 10] Figure 10 is a view of the plate portion from the Z-axis direction, showing a state in which some of the multiple lid portions and the elongated member have been omitted. [Figure 11] FIG. 11 is a view of the plate portion as seen from the Y-axis direction. [Figure 12] FIG. 12 is a view of one end portion of the holding member main body provided in the plate portion in the X-axis direction as seen from the Y-axis direction. [Figure 13] FIG. 13 is a view of the one end portion of the holding member main body as seen from one side in the Z-axis direction. [Figure 14] FIG. 14 is a view of the one end portion of the holding member main body as seen from the other side in the Z-axis direction. [Figure 15] FIG. 15 is a view of the holding member main body as seen from one side in the X-axis direction. [Figure 16] FIG. 16 is a perspective view of a conventional power supply device. [Figure 17] FIG. 17 is an exploded perspective view of the power supply device. BEST MODE FOR CARRYING OUT THE INVENTION

[0013] The power storage device according to the present embodiment includes a plurality of power storage elements arranged in a first direction, an end member arranged in the first direction in parallel with the plurality of power storage elements, a bus bar holding member that holds at least one bus bar for electrically connecting the power storage elements to each other and extends in the first direction along the plurality of power storage elements, and an electric wire that is arranged along the bus bar holding member and protrudes from one end portion of the bus bar holding member in the first direction. The bus bar holding member has a first fixing portion that is arranged at one end portion in the first direction and to which the electric wire is fixed, and a second fixing portion that is fixed to the end member.

[0014] With this configuration, when a force is applied to the portion of the electric wire protruding from the busbar holding member in a direction intersecting the first direction, the movement of the busbar holding member is suppressed because the busbar holding member to which the electric wire is fixed is fixed to the end member by the second fixing part. This suppresses the effect of the force on the connection point between the busbar and the energy storage element.

[0015] In the aforementioned energy storage device, The second fixing portion may be positioned so as to overlap or be adjacent to the first fixing portion when viewed from a second direction in which the busbar holding member, the plurality of energy storage elements, and the end member are aligned, with at least a portion of it.

[0016] With this configuration, when a force is applied to the protruding portion of the electric wire in a direction intersecting the first direction, the proximity of the first and second fixing portions effectively suppresses the movement of the busbar holding member caused by the force. This further effectively suppresses the effect of the force on the busbar and the connection point between the busbar and the energy storage element.

[0017] Furthermore, in the aforementioned energy storage device, The end member is, A main body portion that extends along a plane direction perpendicular to the first direction and overlaps with the energy storage element when viewed from the first direction, It has an extension portion that extends from the main body portion in a direction away from the energy storage element along the first direction, The extended portion may engage with the second fixed portion.

[0018] In this way, by fixing (engaging) the second fixing part to the extension that extends away from the main body, the dimensions of the main body in the first direction can be reduced.

[0019] in this case, The extended portion has a through hole that penetrates in the second direction in the portion that overlaps with the busbar holding member when viewed from the second direction in which the busbar holding member, the plurality of energy storage elements, and the end member are aligned. The second fixing portion may extend in the second direction and pass through the through hole.

[0020] In this way, the second fixing portion engages with the extension portion by inserting it through the through hole of the extension portion, making it difficult for the busbar holding member to move in a direction intersecting the second direction (the direction in which the second fixing portion is inserted) when force is applied to the portion of the electric wire protruding from the busbar holding member (i.e., movement of the busbar holding member in a direction intersecting the second direction is effectively suppressed).

[0021] Furthermore, in the aforementioned energy storage device, The end member comprises a metal termination member and an insulating member disposed between the termination member and the energy storage element in the first direction to insulate the termination member from the energy storage element. The terminal member may have the extended portion.

[0022] Thus, because the terminal member to which the second fixing part is fixed is made of metal, sufficient strength is ensured in the terminal member, and this more effectively suppresses the movement of the busbar holding member when a force is applied to the portion of the electric wire protruding from the busbar holding member in a direction intersecting the first direction.

[0023] Hereinafter, one embodiment of the present invention will be described with reference to Figures 1 to 15. Note that the names of each component (each element) in this embodiment are those of this embodiment and may differ from the names of each component (each element) in the background art.

[0024] As shown in Figures 1 to 5, the energy storage device 1 of this embodiment comprises a plurality of energy storage elements 10 arranged in a predetermined direction, an end member 30 arranged in the predetermined direction with respect to the plurality of energy storage elements 10, at least one busbar 6 that connects the energy storage elements 10 electrically, a busbar holding member 7 that holds the busbar 6 and extends in the predetermined direction along the plurality of energy storage elements 10, and an electric wire 80 arranged along the busbar holding member 7 and protruding from one end of the busbar holding member 7 in the predetermined direction. Specifically, it is as follows.

[0025] This energy storage device 1 comprises a device body A having a plurality of energy storage elements 10, and a plate portion B including a busbar holding member 7 that holds the busbar 6.

[0026] The device body A comprises a plurality of energy storage elements 10, each having an external terminal 14; a plurality of adjacent members 2 arranged between each energy storage element 10; a holding part 3 that tightens the plurality of energy storage elements 10 in the predetermined direction; a first fastening member 4 that fixes at least one adjacent member 2 to the holding part 3; and an insulator 5 that insulates the plurality of energy storage elements 10 from the holding part 3.

[0027] Each of the multiple energy storage elements 10 is a primary battery, a secondary battery, a capacitor, etc. The energy storage element 10 in this embodiment is a non-aqueous electrolyte secondary battery that can be charged and discharged. More specifically, the energy storage element 10 is a lithium-ion secondary battery that utilizes electron transfer that occurs with the movement of lithium ions.

[0028] Specifically, each energy storage element 10 comprises an electrode body, a case 11 that houses the electrode body together with an electrolyte, an external terminal 14 in which at least a portion is exposed to the outside of the case 11, and a current collector that connects the electrode body and the external terminal 14.

[0029] In the electrode body, positive and negative electrodes are stacked alternately with a separator in between. In this electrode body, lithium ions move between the positive and negative electrodes, causing the energy storage element 10 to charge and discharge.

[0030] Case 11 comprises a case body 12 having an opening and a plate-shaped lid 13 that closes (closes) the opening of the case body 12. The case body 12 has a rectangular tube shape with one end closed in the direction of the opening (i.e., a bottomed rectangular tube shape), and case 11 has a rectangular parallelepiped shape (hexagonal shape).

[0031] Specifically, the case body 12 comprises a plate-shaped closing portion 121 and a cylindrical body portion (peripheral wall) 122 connected to the periphery of the closing portion 121.

[0032] The closure portion 121 is located at the lower end of the case body 12 when the case body 12 is positioned with the opening facing upwards (i.e., it becomes the bottom wall of the case body 12 when the opening is facing upwards). The closure portion 121 is rectangular in shape when viewed from the direction normal to the closure portion 121.

[0033] The body portion 122 is rectangular in shape, more specifically, a flattened rectangular shape. The body portion 122 has a pair of long wall portions 123 extending from the long side at the periphery of the closure portion 121, and a pair of short wall portions 124 extending from the short side at the periphery of the closure portion 121. In this body portion 122, the short wall portions 124 connect the corresponding ends of the pair of long wall portions 123, thereby forming the rectangular body portion 122.

[0034] The cover plate 13 is a plate-shaped member that closes the opening of the case body 12. This cover plate 13 has a rectangular plate-shaped cover plate body 131 and a gas discharge valve 132 that is positioned on the cover plate body 131.

[0035] The gas discharge valve 132 discharges gas to the outside when the pressure inside the case 11 exceeds a predetermined value due to gas generation inside the case 11. In this embodiment, the gas discharge valve 132 is located in the center of the cover plate body 131 in the longitudinal direction.

[0036] The case 11 is formed when the cover plate 13, configured in this way, is joined to the case body 12 with its peripheral edge overlapping the opening peripheral edge of the case body 12.

[0037] The external terminal 14 is a part that is electrically connected to the external terminal 14 of another energy storage element 10 or to external equipment, etc. The external terminal 14 is formed of a conductive material. For example, the external terminal 14 is formed of a highly weldable metal material such as aluminum or an aluminum alloy, or a copper alloy.

[0038] The energy storage element 10 of this embodiment is equipped with two external terminals 14, which are located at both ends of the cover plate 13 in the longitudinal direction. Specifically, the two external terminals 14 are positioned on the cover plate 13 with the gas discharge valve 132 in between.

[0039] The energy storage elements 10 described above are flat rectangular parallelepipeds, and the multiple energy storage elements 10 are arranged in the predetermined direction with the wide surfaces (long walls 123) of the case 11 facing each other. At this time, the gas discharge valves 132 of each energy storage element 10 are arranged in a line in the predetermined direction. In addition, one external terminal 14 of each energy storage element 10 and the other external terminal 14 are arranged in the predetermined direction at each position with the gas discharge valve 132 in between.

[0040] In the following explanation, the direction in which the multiple energy storage elements 10 are aligned (first direction) is defined as the X-axis of the Cartesian coordinate system, the direction in which the short wall portions 124 of the case 11 face each other is defined as the Y-axis of the Cartesian coordinate system, and the direction in which the cover plate 13 and the closing portion 121 face each other (second direction) is defined as the Z-axis of the Cartesian coordinate system.

[0041] Each of the multiple adjacent members 2 is insulating and is positioned between the energy storage elements 10 aligned in the X-axis direction. In this embodiment, the adjacent members 2 are made of resin. These adjacent members 2 form a flow path R through which a temperature-regulating fluid (a gas such as air in this embodiment) can flow between them and adjacent energy storage elements 10. In the energy storage device 1 of this embodiment, the multiple adjacent members 2 include multiple types of adjacent members 2A, 2B.

[0042] Specifically, the plurality of adjacent members 2 include a first adjacent member 2A positioned between two adjacent energy storage elements 10, and a second adjacent member 2B positioned between adjacent energy storage elements 10 and fixed to the holding part 3. That is, the energy storage device 1 comprises a first adjacent member 2A and a second adjacent member 2B as adjacent members 2. The energy storage device 1 of this embodiment comprises a plurality of first adjacent members 2A and one second adjacent member 2B. Each of these plurality of first adjacent members 2A is positioned between each energy storage element 10, excluding the space between the energy storage elements 10 where the second adjacent member 2B is positioned.

[0043] Each of the multiple first adjacent members 2A has a first main body portion 21A that extends in a direction perpendicular to the X-axis direction between adjacent energy storage elements 10 in the X-axis direction, and at least one first restricting portion 25A that restricts the movement of the energy storage element 10 adjacent to the first main body portion 21A relative to the first main body portion 21A. In addition, each of the multiple first adjacent members 2A forms at least one flow path R through which a temperature-regulating fluid can flow between adjacent energy storage elements 10.

[0044] The first main body portion 21A is a part that faces the long wall portion 123 of the case 11 of the energy storage element 10, with a portion of it in contact with it. This first main body portion 21A, together with the adjacent energy storage element 10, forms a flow path R through which a temperature-regulating fluid can flow between it and the energy storage element 10. In this embodiment, the first main body portion 21A is a rectangular plate shape with a size corresponding to the energy storage element 10 when viewed from the X-axis direction, and its cross-sectional shape along the XZ plane (the plane including the X-axis direction and the Z-axis direction) is a rectangular wave shape.

[0045] The first restricting portion 25A extends in the X-axis direction from at least one corner of the rectangular first main body portion 21A and restricts the relative movement of the energy storage element 10 (specifically the case 11) adjacent to the first main body portion 21A in the YZ plane direction (a plane including the Y-axis direction and the Z-axis direction) by contacting the energy storage element 10 from the outside in the YZ plane direction. In this embodiment, the first restricting portion 25A extends from the first main body portion 21A toward one side and the other side in the X-axis direction.

[0046] The second adjacent member 2B includes a second main body portion 21B that extends in a direction perpendicular to the X-axis direction (YZ plane direction) between two adjacent energy storage elements 10, a second fastening member 22B used to fix the second adjacent member 2B to the holding portion 3, and at least one second restricting portion 25B that restricts the movement of the energy storage element 10 adjacent to the second main body portion 21B relative to the second main body portion 21B. The second adjacent member 2B also forms at least one flow path R through which a temperature-regulating fluid can flow between it and the adjacent energy storage elements 10.

[0047] The second main body portion 21B is a part that faces the long wall portion 123 of the case 11 of the energy storage element 10, with a portion of it in contact with it. This second main body portion 21B, together with the adjacent energy storage element 10, forms a flow path R through which a temperature-regulating fluid can flow between it and the energy storage element 10. The dimension of this second main body portion 21B in the X-axis direction is larger than the dimension of the first main body portion 21A in the X-axis direction (i.e., it is thicker). In this embodiment, the second main body portion 21B is a rectangular plate shape with a size corresponding to the energy storage element 10 when viewed from the X-axis direction. This second main body portion 21B has a plurality of protrusions 211B, each extending in the Y-axis direction and spaced apart in the Z-axis direction. These plurality of protrusions 211B protrude from the surface 212B of the second main body portion 21B that faces the energy storage element 10.

[0048] The second fastening members 22B are positioned at each end of the second main body 21B in the Y-axis direction. Each of these multiple second fastening members 22B fastens the second adjacent member 2B to the retaining part 3 by engaging with the first fastening member 4. In this embodiment, each second fastening member 22B is an insert nut. In this embodiment, each first fastening member 4 is a bolt, which fastens the second adjacent member 2B to the retaining part 3 by engaging (screwing) with the second fastening member 22B while the retaining part 3 is inserted through it.

[0049] The second restricting portion 25B extends in the X-axis direction from at least one corner of the rectangular second main body portion 21B and restricts the relative movement of the energy storage element 10 (specifically the case 11) adjacent to the second main body portion 21B in the YZ-axis direction by contacting it from the outside in the YZ-axis direction. In this embodiment, the second restricting portion 25B extends from the second main body portion 21B in one direction and the other in the X-axis direction.

[0050] The holding portion 3 has an end member 30 adjacent to a laminate D (see Figure 5) composed of energy storage elements 10 and adjacent members 2 arranged alternately in the X-axis direction, and a connecting member 37 connected to the end member 30 and extending in the X-axis direction along the laminate D. The holding portion 3 in this embodiment has a pair of end members 30 arranged on both sides of the laminate D in the X-axis direction, and a pair of connecting members 37 that connect the corresponding ends of the pair of end members 30 in the Y-axis direction. The holding portion 3 also has a plurality of connecting members 38 that connect the end members 30 and the connecting members 37.

[0051] Each of the pair of end members 30 has a main body E that extends along a plane direction perpendicular to the X-axis direction and overlaps with the energy storage element 10 when viewed from the X-axis direction, and an extension F that extends from the main body E in a direction away from the energy storage element 10 along the X-axis direction. The end member 30 in this embodiment is composed of two plate-shaped members (end member 31, insulating member 35) aligned in the X-axis direction, the main body E is composed of parts 321, 33 of one of these two members 31, 35 and part 351 of the other member 35, and the extension F is composed of part 322 of one of the members 31.

[0052] Specifically, each end member 30 includes a metal end member 31 and an insulating member 35 positioned between the end member 31 and the energy storage element 10 (more specifically, the energy storage element 10 positioned at the end of the laminate D in the X-axis direction) to insulate the end member 31 from the energy storage element 10.

[0053] The terminal member 31 is a rectangular plate sized to correspond to the energy storage element 10, and has connecting through holes 31a at its four corners that penetrate in the X-axis direction. In other words, the terminal member 31 has four connecting through holes 31a. These four connecting through holes 31a are used to connect the terminal member 31 to the connecting member 37.

[0054] Specifically, the terminal member 31 has a first member 32 and a second member 33 that are aligned in a direction approaching the energy storage element 10 in the X-axis direction, and is rectangular in shape with an elongated length in the Y-axis direction when viewed from the X-axis direction. Furthermore, the terminal member 31 of this embodiment has a plurality of fixing portions 34 that extend from the first member 32 along the X-axis direction.

[0055] The first member 32 has a plate-shaped first member body 321 that extends along a direction perpendicular to the X-axis direction (YZ plane direction), and a flange portion 322 that extends from the first member body 321 in a direction away from the energy storage element 10 in the X-axis direction.

[0056] The first member body 321 is rectangular in shape when viewed from the X-axis direction, corresponding to the energy storage element 10, and more specifically, it is a rectangular shape that is elongated in the Y-axis direction. This first member body 321 has first connecting through holes 3211 that penetrate in the X-axis direction at its four corners (i.e., each corner of the rectangular shape). In other words, the first member body 321 has four first connecting through holes 3211. Furthermore, the first member body 321 has two fixing through holes 3212 that penetrate in the X-axis direction, located towards the center C side (inward) from the first connecting through holes 3211 at both ends of the first member body 321 in the Y-axis direction. These two fixing through holes 3212 are spaced apart in the diagonal direction of the first member body 321.

[0057] The flange portion 322 is a plate-shaped portion that extends from one end of the first member body 321 in the Z-axis direction (upper end in Figure 7) toward the energy storage element 10 in the X-axis direction, and also extends in the Y-axis direction. In the energy storage device 1 of this embodiment, this flange portion 322 constitutes the extended portion F of the end member 30.

[0058] The flange portion 322 has a first through hole 3221, a second through hole 3222, and a third through hole 3223 arranged sequentially from one end in the Y-axis direction (the left end in the example shown in Figure 6) to the other end. In addition, the flange portion 322 in this embodiment has a fourth through hole 3224 located closer to the other end in the Y-axis direction than the third through hole 3223. This fourth through hole 3224 is located in the center of the flange portion 322 in the Y-axis direction. Each of the through holes 3221, 3222, 3223, and 3224 penetrates the flange portion 322 in the Z-axis direction. Although not shown in this embodiment, terminal blocks equipped with terminals for electrical connection to external equipment such as a vehicle are fixed to the first through hole 3221, the second through hole 3222, and the third through hole 3223. A busbar 6, which is connected to the external terminal 14 of the energy storage element 10 located at the end in the X-axis direction, is electrically connected to these terminals.

[0059] Furthermore, the flange portion 322 has a first notch 3225 cut out between the first through hole 3221 and the second through hole 3222 in the Y-axis direction, which is recessed in the X-axis direction toward the energy storage element 10, and a second notch 3226 cut out from the fourth through hole 3224 in the Y-axis direction to the other end. In this first notch 3225, the depth in the recess direction (dimension in the X-axis direction) decreases as it approaches the second through hole 3222 from the first through hole 3221.

[0060] The first through-hole 3221 is a circular hole that is elongated in the Y-axis direction (a so-called racetrack shape), the second through-hole 3222 is a circular hole, and the third through-hole 3223 is a square hole. The fourth through-hole 3224 is a square hole with arc-shaped corners and is larger than the third through-hole 3223.

[0061] The second member 33 has a rectangular shape, more specifically, a rectangular shape that is elongated in the Y-axis direction, that corresponds to the first member body 321 of the first member 32 when viewed from the X-axis direction, and is superimposed on the first member 32. The second member 33 has second connecting through holes 331 (see Figure 6) that penetrate in the X-axis direction at its four corners (i.e., each corner of the rectangle). In other words, the second member 33 has four second connecting through holes 331.

[0062] Each of these four second connecting through holes 331 overlaps with the first connecting through holes 3211 located at the four corners of the first member body 321 when viewed from the X-axis direction. As a result, the first connecting through holes 3211 of the first member body 321 and the second connecting through holes 331 of the second member 33 are aligned in the X-axis direction to form the connecting through hole 31a of the end member 31.

[0063] Furthermore, the second member 33 has a plurality of (two in this embodiment) protrusions 332 that project toward the energy storage element 10 in the X-axis direction. Each of these multiple protrusions 332 extends in the Y-axis direction and is spaced apart in the Z-axis direction. The top of each protrusion 332 (the tip in the protruding direction) abuts against the insulating member 35 (see Figure 8). The protrusions 332 in this embodiment are formed by drawing.

[0064] Each of the multiple fixing parts 34 has a shaft portion 341 that extends (in other words, protrudes) from the first member body 321 in the direction away from the energy storage element 10 in the X-axis direction through a fixing part through hole 3212 in the first member body 321, and a head portion 342 that extends from the shaft portion 341 in a direction perpendicular to the X-axis direction between the first member 32 and the second member 33 in the X-axis direction. This head portion 342 is larger than the fixing part through hole 3212. The shaft portion 341 has male threads on its circumferential surface. These fixing parts 34 are used to fix the energy storage device 1 when it is mounted on a vehicle or other device.

[0065] The insulating member 35 is a member that insulates the space between the terminal member 31 and the laminate D, and in this embodiment, the insulating member 35 is made of resin. Specifically, the insulating member 35 has an insulating member body 351 that extends in a direction perpendicular to the X-axis direction between the terminal member 31 and the energy storage element 10 located at the X-axis end of the laminate D, and at least one insulating member restricting portion 352 that restricts the movement of the energy storage element 10 adjacent to the insulating member body 351 relative to the insulating member body 351. The insulating member 35 also has a peripheral wall portion 353 that extends from the peripheral edge of the insulating member body 351 toward the terminal member 31 in the X-axis direction, and a first wall portion 354 and a second wall portion 355 that extend from the insulating member body 351 toward the terminal member 31 in the X-axis direction and also extend in the Y-axis direction.

[0066] The insulating member 35 faces an adjacent energy storage element 10 with a portion of its long wall portion 123 in contact with the energy storage element 10, thereby forming at least one flow path R through which a temperature-regulating fluid can flow between the two elements. In this embodiment, the insulating member 35 forms multiple flow paths R between adjacent energy storage elements 10.

[0067] The insulating member body 351 is a rectangular plate-shaped portion whose size corresponds to that of adjacent energy storage elements 10 when viewed from the X-axis direction. Specifically, the insulating member body 351 is plate-shaped and extends in a direction perpendicular to the X-axis direction. This insulating member body 351 has an opposing surface 3511A that faces an adjacent energy storage element 10 (more specifically, the long wall portion 123 of the case 11), an opposing surface 3511B which is the back surface of the opposing surface 3511A and faces the terminal member 31, and a plurality of protrusions 3512 that project from the opposing surface 3511A that faces the energy storage element 10. The insulating member body 351 also has a plurality of recesses 3513 located on the opposing surface 3511B that faces the terminal member 31.

[0068] Each of the multiple protrusions 3512 extends in the Y-axis direction on the opposing surface 3511A and is spaced apart in the Z-axis direction. The tip surface 3512a of each of these multiple protrusions 3512 in the protruding direction (X-axis direction) is in contact with the energy storage element 10 adjacent to the insulating member body 351. As a result, a flow path R is formed on the energy storage element 10 side of the insulating member body 351 by the opposing surface 3511A of the insulating member body 351, the two adjacent protrusions 3512 spaced apart in the Z-axis direction on the opposing surface 3511A, and the energy storage element 10 (long wall portion 123 of the case 11) facing the opposing surface 3511A.

[0069] Each of the multiple recesses 3513 is recessed in the X-axis direction on the opposing surface 3511B and is positioned to correspond to each connecting through hole 31a of the terminal member 31. In this embodiment, the recesses 3513 are circular when viewed from the X-axis direction, and the bottom surface 3513a widens in a direction perpendicular to the X-axis direction.

[0070] The insulating member restricting portion 352 extends in the X-axis direction from at least one corner of the rectangular insulating member body 351 and restricts the relative movement of the energy storage element 10 (specifically the case 11) adjacent to the insulating member 35 in the YZ-axis direction by contacting it from the outside in the YZ-axis direction. In this embodiment, the insulating member restricting portion 352 extends from the insulating member body 351 toward one side in the X-axis direction (towards the energy storage element 10).

[0071] The peripheral wall portion 353 extends from each side of the rectangular insulating member body 351 in a direction toward the end member 31 in the X-axis direction.

[0072] The first wall portion 354 extends in the X-axis direction and the Y-axis direction from the opposing surface 3511B of the insulating member body 351. This first wall portion 354 is located at one end of the insulating member body 351 in the Z-axis direction, and a predetermined gap is formed between each end of the first wall portion 354 in the Y-axis direction and the peripheral wall portion 353.

[0073] The second wall portion 355 extends in the X-axis direction and the Y-axis direction from the opposing surface 3511B of the insulating member body 351. This second wall portion 355 is located at the other end of the insulating member body 351 in the Z-axis direction, and a predetermined gap is formed between each end of the second wall portion 355 in the Y-axis direction and the peripheral wall portion 353.

[0074] Each of the pair of connecting members 37 has a connecting member body 370 facing the short wall portion 124 of each energy storage element 10, a first piece portion 371 extending in the Y-axis direction and in the X-axis direction from one end of the connecting member body 370 in the Z-axis direction (upper in Figure 5) along the cover plate 13 of each energy storage element 10, a second piece portion 372 extending in the Y-axis direction and in the X-axis direction from the other end of the connecting member body 370 in the Z-axis direction (lower in Figure 5) along the closing portion 121 of each energy storage element 10, and a pair of third pieces portion 373 extending in the Y-axis direction and in the Z-axis direction from each end of the connecting member body 370 in the X-axis direction along the end member 30 (specifically, the terminal member 31).

[0075] The connecting member body 370 is plate-shaped and extends along the short wall portion 124 of each energy storage element 10, and has a plurality of through holes 3701 that penetrate in the Y-axis direction so that the temperature control fluid can flow into or out of each flow path R.

[0076] The first piece 371 is a long strip in the X-axis direction, and its Y-axis dimension (width) is constant at each position except for both ends in the X-axis direction. The second piece 372 is also a long strip in the X-axis direction, and its Y-axis dimension (width) is constant at each position except for both ends in the X-axis direction. The Y-axis width of this second piece 372 is greater than the width of the first piece 371. Each of the pair of third pieces 373 has two through holes 3731 spaced apart in the Z-axis direction. Each through hole 3731 is positioned to correspond to the connecting through hole 31a of the end member 31 (a through hole formed by connecting the first connecting through hole 3211 of the first member body 321 and the second connecting through hole 331 of the second member 33).

[0077] Each of the multiple connecting members 38 fastens the terminal member 31 and the connecting member 37 by inserting the connecting through-hole 31a of the terminal member 31 and the through-hole 3731 of the connecting member 37 (specifically, the third piece 373). In this embodiment, each connecting member 38 is composed of a bolt 381 and a nut 382. The bolt 381 fastens the third piece 373 and the terminal member 31 by screwing (engaging) it with the nut 382, ​​which is positioned between the terminal member 31 and the insulating member 35, while sequentially inserting the bolt 381 through the through-hole 3731 of the third piece 373 of the connecting member 37 and the connecting through-hole 31a of the terminal member 31.

[0078] The insulator 5 is insulating. This insulator 5 is placed between the connecting member 37 and the plurality of energy storage elements 10. Specifically, the energy storage device 1 includes a pair of insulators 5, and each insulator 5 covers the region of the connecting member 37 that faces at least the plurality of energy storage elements 10 (or laminate D). In this way, each insulator 5 insulates the connection member 37 from the plurality of energy storage elements 10. Each insulator 5 has through holes 51 at positions corresponding to each through hole 3701 of the connecting member body 370, with through holes 51 having the same size and shape as each through hole 3701 of the connecting member body 370.

[0079] As shown in Figures 1, 2, 4, 9 to 11, the plate portion B includes at least one busbar 6 that connects the external terminals 14 of different energy storage elements 10, a busbar holding member 7 that holds at least one busbar 6, and a harness 8 that is arranged on the busbar holding member 7. The plate portion B of this embodiment also includes a thermistor S for detecting the temperature of the energy storage elements 10.

[0080] At least one busbar 6 is a conductive plate-shaped member such as metal, and connects the external terminals 14 of different energy storage elements 10. The energy storage device 1 of this embodiment is equipped with multiple busbars 6, and each busbar 6 connects the external terminals 14 of adjacent energy storage elements 10 in the X-axis direction. Specifically, the busbars 6 have a rectangular outline when viewed from the Z-axis direction and are welded to each of the adjacent external terminals 14 in the X-axis direction. These multiple busbars 6 connect (make conductive) the multiple energy storage elements 10 equipped with the energy storage device 1 in series.

[0081] The thermistor S contacts the surface (case 11) of the energy storage element 10 and outputs a signal corresponding to the temperature of the surface of the energy storage element 10. The energy storage device 1 of this embodiment is equipped with a plurality of thermistors S (a number less than or equal to the number of energy storage elements 10 provided in the energy storage device 1) and detects the temperature of a predetermined energy storage element 10 among the plurality of energy storage elements 10.

[0082] The harness 8 includes a cable section 81 having a plurality of electric wires 80, and a connector 82 positioned at the end of the cable section 81.

[0083] The cable section 81 is formed by bundling together at least a portion of a plurality of electric wires 80, each with one end connected to a busbar 6 or thermistor S. The cable section 81 is positioned on the busbar holding member 7 with one end protruding from the busbar holding member 7 in the X-axis direction. A connector 82 is attached to the protruding end of the cable section 81. The connector 82 in this embodiment is a multi-core connector.

[0084] The busbar holding member 7 includes a plate-shaped holding member body 70 that covers the surface of the laminate D where the external terminals 14 are lined up, and a fixing part 76 that is positioned at the X-axis end of the holding member body 70 and engages with the end member 30 to fix the busbar holding member 7 to the device body A. The busbar holding member 7 of this embodiment has a long member 77 that is detachably attached to the holding member body 70. The holding member body 70 and the fixing part 76 are made of resin and are formed by integral molding. This busbar holding member 7 has a fixing part 76 at one end of the holding member body 70 in the X-axis direction, and has the same configuration as a part of the fixing part 76 (second fixing part, described later) 765 at the other end of the holding member body 70 in the X-axis direction (see Figure 11).

[0085] The holding member body 70 is a plate-shaped member whose dimensions in the Z-axis direction are smaller than those in the X-axis and Y-axis directions, and is rectangular in shape with a size corresponding to the laminate D when viewed from the Z-axis direction. This holding member body 70 has a plurality of busbar holding parts 71, each holding a busbar 6, a harness placement part 72 on which a harness 8 is placed, and a plurality of cover parts 73. The holding member body 70 also has a plurality of thermistor holding parts 74, each holding a thermistor S. The holding member body 70 of this embodiment has an opening 75 on which a part of the laminate D is exposed when viewed from one side to the other in the Z-axis direction (i.e., when viewed from the plate part B toward the device body A). Note that in Figure 10, only one of the plurality of cover parts 73 is shown.

[0086] Each of the multiple busbar holding portions 71 is a portion that holds the busbar 6 so as to surround the peripheral edge of the busbar 6. In this embodiment, the busbar holding portion 71 holds the busbar 6 by surrounding the peripheral edge of the busbar 6, to which the external terminals 14 of adjacent energy storage elements 10 are welded, with a rectangular tubular peripheral wall portion 711 when viewed from the Z-axis direction (see enlarged view of Figure 10).

[0087] Each of these multiple busbar holding portions 71 is aligned in the X-axis direction at both the Y-axis end and the other end of the holding member body 70. In other words, in the holding member body 70, two rows of busbar holding portions 71 aligned in the X-axis direction (hereinafter also referred to as "holding portion row 71A") are arranged with a gap in the Y-axis direction (see Figure 10). This holding portion row 71A extends from one end to the other in the X-axis direction of the holding member body 70.

[0088] The harness arrangement section 72 is a groove-shaped portion, and the cable portion 81 of the harness 8 is arranged inside it. This harness arrangement section 72 has two first portions 721 adjacent to the inside (center side) of each holding portion row 71A in the Y-axis direction and extending in the X-axis direction along the holding portion row 71A, and a second portion 722 extending in the Y-axis direction and connecting one end of each first portion 721 in the X-axis direction. In each of the two first portions 721, the side walls in the Y-axis direction extend continuously or intermittently in the X-axis direction, and the bottom wall extends continuously or intermittently in the X-axis direction.

[0089] In the harness arrangement section 72 configured in this way, cable sections 81 are arranged in each of the first section 721 and the second section 722, and the harness 8 is arranged such that the end of the harness 8 on the connector 82 side protrudes in the X-axis direction from the center of the second section 722 in the Y-axis direction. The cable sections 81 corresponding to the two rows of holding sections 71A described above are pulled out together from one end of the holding member body 70 in the X-axis direction (the side where the fixing section 76 is located).

[0090] Each of the multiple cover portions 73 is a plate-shaped portion that releasably covers one end in the Z-axis direction of the peripheral wall portion 711 of the busbar holding portion 71 and one end in the Z-axis direction of the first portion 721 of the harness arrangement portion 72. Each cover portion 73 is rectangular in shape, with a part of its periphery connected to a corresponding portion of the aforementioned end of the peripheral wall portion 711, and this connection portion 731 is flexible. In this embodiment, the cover portion 73 is rectangular in shape, large enough to cover two adjacent busbar holding portions 71 in the X-axis direction and the first portion 721 corresponding to the two busbar holding portions 71, or rectangular in shape, large enough to cover one busbar holding portion 71 and the first portion 721 corresponding to the busbar holding portion 71.

[0091] Each of the multiple thermistor holders 74 is positioned adjacent to the first portion 721 in the inward direction in the Y-axis direction, and spaced apart in the X-axis direction. These thermistor holders 74 hold the thermistor S in a state where it is pressed against the cover plate 13 of the energy storage element 10.

[0092] The opening 75 extends from one end in the X-axis direction to the other end in the Y-axis direction at the center of the holding member body 70, and a long member 77 is detachably attached to it. When this long member 77 is removed, when the energy storage device 1 is viewed from the Z-axis direction, the gas discharge valves 132 of each energy storage element 10 constituting the laminate D are exposed through the opening 75 of the holding member body 70.

[0093] As shown in Figures 12 to 15, the fixing portion 76 has a first fixing portion 761 to which the harness 8 is fixed and a second fixing portion 765 to which the end member 30 is fixed, and is located at one end of the holding member body 70 in the X-axis direction.

[0094] The first fixing portion 761 has an extension portion 762 extending along the X-axis from one end of the holding member body 70 in the X-axis direction (specifically, the central position of the second portion 722 in the Y-axis direction), and a band portion 763 that bundles the extension portion 762 and the harness 8. Note that the band portion 763 is not shown in Figures 13 and 14 for the sake of explanation.

[0095] The extension portion 762 includes a plate-shaped extension portion body 7621 that extends in the X-axis direction and the Y-axis direction, and a pair of reinforcing portions 7625 that extend from the extension portion body 7621 in the other direction in the Z-axis direction and also in the Y-axis direction.

[0096] The extension body 7621 has a support surface 7621a facing one direction in the Z-axis direction and supporting the harness 8, and a pair of recesses 7622 at both ends in the Y-axis direction that are recessed toward the center in the Y-axis direction. The support surface 7621a extends in a direction perpendicular to the Z-axis direction and is flush with the bottom surface of the second portion 722, specifically the surface of the bottom wall of the second portion 722 facing one direction in the Z-axis direction. The pair of recesses 7622 are located at both ends in the Y-axis direction at the tip of the extension body 7621.

[0097] Furthermore, the extension body 7621 of this embodiment has two through holes 7621b spaced apart in the Y-axis direction at a position closer to the base than the pair of recesses 7622. Each through hole 7621b penetrates the extension body 7621 in the Z-axis direction.

[0098] The pair of reinforcing portions 7625 are positioned on the base side of the pair of recesses 7622 in the extension portion body 7621, spaced apart in the X-axis direction. In this embodiment, each reinforcing portion 7625 extends from one end to the other of the extension portion body 7621 in the Y-axis direction.

[0099] The band portion 763 secures the harness 8 to the extension portion 762 by surrounding the extension portion 762 (more specifically, the extension portion body 7621) and the harness 8 in an overlapping state. The band portion 763 surrounds the extension portion body 7621 and the harness 8 while being fitted into each recess 7622 of the extension portion body 7621. This prevents the band portion 763 from moving relative to the extension portion body 7621 in the X-axis direction. The band portion 763 in this embodiment is a cable tie.

[0100] The second fixing portion 765 is positioned so as to overlap or be adjacent to the first fixing portion 761 in at least a portion of it when viewed from the Z-axis direction, and engages with the flange portion 322 (extension portion F) of the terminal member 31. In this embodiment, the second fixing portion 765 is positioned so as to overlap with the first fixing portion 761 when viewed from the Z-axis direction. Specifically, the second fixing portion 765 has a rectangular tubular insertion portion 7651 extending in the Z-axis direction from a pair of reinforcing portions 7625, and a pair of locking portions 7652 positioned at both ends in the Y-axis direction at an intermediate position in the Z-axis direction of the insertion portion 7651.

[0101] The insertion portion 7651 is the part that is inserted into the fourth through hole 3224 of the flange portion 322 of the terminal member 31, and the shape of the insertion portion 7651 when viewed from the Z-axis direction is rectangular, corresponding to the shape of the fourth through hole 3224. In this embodiment, a gap 7651a extending in the Z-axis direction is formed in the wall of the insertion portion 7651 on one side in the X-axis direction (the tip side of the extension portion 762).

[0102] Each of the pair of locking portions 7652 protrudes from each wall of the insertion portion 7651 that is opposite in the Y-axis direction, and sandwiches the peripheral edge of the fourth through hole 3224 of the flange portion 322 between itself and the pair of reinforcing portions 7625. Each locking portion 7652 has an inclined surface 7652a that is located outward in the Y-axis direction as it progresses from one side in the Z-axis direction to the other. When the insertion portion 7651 is inserted into the fourth through hole 3224 with the inclined surface 7652a of the flange portion 322 in contact with the peripheral edge of the through hole 3224 of the flange portion 322, the connection points between each locking portion 7652 and the insertion portion 7651 elastically deform and move inward of the insertion portion 7651, and after passing through the flange portion 322 (more specifically, the peripheral edge of the through hole 3224) in the Z-axis direction (insertion direction), they return to their original position (protruding position).

[0103] The elongated member 77 is a member that extends in the X-axis direction and is removably attached to the opening 75 of the holding member body 70 to close the opening 75. The elongated member in this embodiment is made of an insulating material such as resin.

[0104] In the energy storage device 1 configured as described above, when a force is applied in a direction intersecting the X-axis direction to the portion of the harness 8 that protrudes from the busbar holding member 7, the movement of the busbar holding member 7 is suppressed because the busbar holding member 7 to which the harness 8 is fixed is fixed to the end member 30 (in this embodiment, the terminal member 31) by the second fixing part 765. This suppresses the effect of the force on the connection point between the busbar 6 and the energy storage element 10.

[0105] In the energy storage device 1 of this embodiment, the second fixing part 765 is positioned so as to overlap with the first fixing part 761 when viewed from the Z-axis direction (i.e., the direction in which the busbar holding member 7, the laminate D (multiple energy storage elements 10), and the end member 30 are aligned). With this configuration, when a force is applied to the protruding part of the harness 8 in a direction intersecting the X-axis direction, the movement of the busbar holding member 7 caused by the force is effectively suppressed because the positions of the first fixing part 761 and the second fixing part 765 are close together. As a result, the effect of the force on the busbar 6 and the connection part between the busbar 6 and the energy storage element 10 (the welded part in the example of this embodiment) is more effectively suppressed.

[0106] Furthermore, in the energy storage device 1 of this embodiment, the end member 30 has a main body E that extends along a plane direction perpendicular to the X-axis direction and overlaps with the energy storage element 10 when viewed from the X-axis direction, and an extension F (a flange portion 322 in this example) that extends from the main body E in a direction away from the energy storage element 10 along the X-axis direction, and the extension F engages with the second fixing portion 765. By configuring the second fixing portion 765 to be fixed (engaged) to the extension F that extends away from the main body E in this way, the dimensions of the main body E in the X-axis direction can be reduced.

[0107] In this way, by making the end member 30 (more specifically, the main body E) thinner, the dimensions of the energy storage device 1 in the X-axis direction can be reduced (i.e., made more compact). Alternatively, if the dimensions of the energy storage device 1 in the X-axis direction are not reduced, the dimensions of each flow path R formed between the energy storage element 10 and the adjacent member 2 can be increased in the X-axis direction to reduce the flow resistance of the temperature-regulating fluid flowing through the flow path R. This increases the amount of temperature-regulating fluid flowing through each flow path R, thereby improving the cooling efficiency of the energy storage element 10.

[0108] Furthermore, in the energy storage device 1 of this embodiment, the extension portion F has a fourth through-hole 3224 that penetrates in the Z-axis direction at the portion that overlaps with the busbar holding member 7 (specifically, the second fixing portion 765) when viewed from the Z-axis direction, and the second fixing portion 765 extends in the Z-axis direction and is inserted through the fourth through-hole 3224. In this way, the second fixing portion 765 engages with the extension portion F by inserting it through the fourth through-hole 3224 of the extension portion F, making it difficult for the busbar holding member 7 to move in a direction intersecting the Z-axis direction (the direction in which the second fixing portion 765 is inserted) when force is applied to the portion of the harness 8 that protrudes from the busbar holding member 7. That is, the movement of the busbar holding member 7 in a direction intersecting the Z-axis direction is effectively suppressed.

[0109] Furthermore, in the energy storage device 1 of this embodiment, the end member 30 has a metal end member 31 and an insulating member 35 which is positioned between the end member 31 and the energy storage element 10 (specifically, the energy storage element 10 at the end of the laminate D) in the X-axis direction to insulate the end member 31 from the energy storage element 10, and the end member 31 has an extended portion F (flange portion 322). In this way, sufficient strength is ensured in the end member 31 because the end member 31 to which the second fixing portion 765 is fixed is made of metal. As a result, the movement of the busbar holding member 7 when a force is applied in a direction intersecting the X-axis direction to the portion of the harness 8 that protrudes from the busbar holding member 7 is more effectively suppressed.

[0110] Furthermore, in the energy storage device 1 of this embodiment, the harness 8 is fixed to the end member 30 (in this example, the terminal member 31) via the end (fixing portion) 76 of the busbar holding member 7. Therefore, even if the harness 8 is pulled unintentionally, the resin busbar holding member 7 will elastically deform and act as a cushion, thereby preventing the harness 8 from breaking.

[0111] It should be noted that the energy storage device of the present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of the invention. For example, the configuration of one embodiment can be added to the configuration of another embodiment, and a part of the configuration of one embodiment can be replaced with the configuration of another embodiment. Furthermore, a part of the configuration of one embodiment can be deleted.

[0112] The specific configuration of the first fixing portion 761 and the second fixing portion 765 in the busbar holding member 7 is not limited. For example, in the above embodiment, the first fixing portion 761 is composed of an extension portion 762 and a band portion 763, and the band portion 763 surrounds the extension portion 762 and the harness 8 so that the portion of the harness 8 protruding from the busbar holding member 7 is fixed to the busbar holding member 7. However, the extension portion 762 itself may be configured to fix the harness 8 to the extension portion 762 (for example, by holding, locking, fitting, fastening, bonding, clamping, etc.).

[0113] Furthermore, in the busbar holding member 7 of the above embodiment, the second fixing portion 765 is inserted through the fourth through hole 3224 of the flange portion 322 and engages with the peripheral edge of the through hole 3224, thereby fixing the busbar holding member 7 to the end member 31. However, the busbar holding member 7 may also be fixed to the end member 31 by fastening with a fastening member or by clamping the flange portion 322, for example.

[0114] Furthermore, in the busbar holding member 7 of the above embodiment, the second fixing portion 765 is positioned to overlap the first fixing portion 761 when viewed from the Z-axis direction, but the configuration is not limited to this. That is, the relative positions of the first fixing portion 761 and the second fixing portion 765 in the busbar holding member 7 are not limited.

[0115] Furthermore, by positioning the second fixing portion 765 in a position where at least a part overlaps with or is adjacent to the first fixing portion 761 when viewed from the Z-axis direction, when a force is applied to the protruding portion of the harness 8 in a direction intersecting the X-axis direction, the close proximity of the first fixing portion 761 and the second fixing portion 765 effectively suppresses the movement of the busbar holding member 7 caused by the force. This effectively suppresses the influence of the force on the busbar 6 and the connection portion between the busbar 6 and the energy storage element 10. Here, "the position where the second fixing portion 765 is adjacent to the first fixing portion 761 when viewed from the Z-axis direction" refers to the position where the contour (periphery) of the second fixing portion 765 and the contour (periphery) of the first fixing portion 761 are in contact when viewed from the Z-axis direction.

[0116] Furthermore, in the energy storage device 1 of the above embodiment, the busbar holding member 7 is fixed to the terminal member 31 included in the end member 30, but the configuration is not limited to this. The busbar holding member 7 may also be fixed to the insulating member 35 included in the end member 30. In this case, the insulating member 35 is not limited to being made of resin, and may be a metal member whose surface is covered with an insulating material in order to ensure strength and rigidity.

[0117] Furthermore, in the energy storage device 1 of the above embodiment, the end member 30 is composed of two plate-shaped members, a terminal member 31 and an insulating member 35, but the configuration is not limited to this. The end member 30 may be a single plate-shaped member. Also, the terminal member 31 is composed of two plate-shaped members, a first member 32 and a second member 33, but the configuration is not limited to this. The terminal member 31 may be composed of a single plate-shaped member.

[0118] Furthermore, in the end member 30 of the energy storage device 1 in the above embodiment, the extended portion F is formed by a part of the terminal member 31 (the flange portion 322 in the example of the above embodiment), but the configuration is not limited to this. The extended portion F of the end member 30 may be formed by a part of the insulating member 35.

[0119] Furthermore, the end member 30 has a main body portion E that extends along a plane direction perpendicular to the X-axis direction, and an extension portion F that extends from the main body portion E along the X-axis direction, but is not limited to this configuration. The end member 30 may also have a configuration without the extension portion F. In this case, the busbar holding member 7 may be fixed to the main body portion E of the end member 30.

[0120] Furthermore, while the above embodiments described a case where the energy storage element is used as a non-aqueous electrolyte secondary battery (e.g., a lithium-ion secondary battery) capable of charging and discharging, the type and size (capacity) of the energy storage element are arbitrary. Also, while the above embodiments described a lithium-ion secondary battery as an example of an energy storage element, the invention is not limited to this. For example, the present invention can be applied to various secondary batteries, as well as primary batteries and capacitors such as electric double-layer capacitors. [Explanation of symbols]

[0121] 1...Energy storage device, 2...Adjacent member, 2A...First adjacent member, 21A...First main body, 25A...First restricting part, 2B...Second adjacent member, 21B...Second main body, 211B...Protrusion, 212B...Opposite surface, 22B...Second fastening member, 25B...Second restricting part, 3...Holding part, 30...End member, 31...Terminal member, 31a...Connecting through hole, 32...First member, 321...First member body, 3211...First connecting through hole, 3212...Fixing part through hole, 322...Flange, 3221...First through hole, 3222...Second through hole, 3223...Third through hole, 3224...Fourth through hole (through hole), 33...Second member, 33 1...Second connecting through hole, 332...Protrusion, 34...Fixing part, 341...Shaft part, 342...Head, 35...Insulating member, 351...Insulating member body, 3511A, 3511B...Opposite surfaces, 3512...Protrusion, 3512a...Tip surface, 3513...Recess, 3513a...Bottom surface, 352...Insulating member restricting part, 353...Peripheral wall part, 354...First wall part, 355...Second wall part, 37...Connecting member, 370...Connecting member body, 3701...Through hole, 371...First piece part, 372...Second piece part, 373...Third piece part, 3731...Through hole, 38...Connecting member, 381...Bolt, 382...Nut, 4...First fastening member, 5...Insulator Circulator, 51...Through hole, 6...Busbar, 7...Busbar holding member, 70...Holding member body, 71...Busbar holding part, 71A...Holding part row, 711...Peripheral wall part, 72...Harness arrangement part, 721...First part, 722...Second part, 73...Lid part, 731...Connection part, 74...Thermistor holding part, 75...Opening, 76...Fixing part, 761...First fixing part, 762...Extended part, 7621...Extended part body, 7621a...Support surface, 7621b...Through hole, 7622...Recess, 7625...Reinforcement part, 763...Band part, 765...Second fixing part, 7651...Insertion part, 7651a...Gap, 7652...Locking part, 76 52a...Inclined surface, 77...Long member, 8...Harness, 80...Electric wire, 81...Cable section, 82...Connector, 10...Energy storage element, 11...Case, 12...Case body, 121...Blocking section, 122...Body section, 123...Long wall section, 124...Short wall section, 13...Lid plate, 131...Lid plate body, 132...Gas discharge valve, 14...External terminal, 500...Power supply unit, 501...Battery, 502...Battery assembly, 502a...Top surface, 503...Busbar module, 504...Plate, 505...Plate body, 506...Housing section, 507...Electric wire holding section, 509...Electric wire, 510...Battery body, 510a...End face, 511...Positive electrode,512...negative electrode, 530...nut, A...device body, B...plate section, C...center of the terminal member in the Y-axis direction, D...laminated body, E...main body section, F...extension section, R...flow channel, S...thermistor

Claims

1. Multiple energy storage elements arranged in the first direction, In the first direction, the end members are arranged in line with the plurality of energy storage elements, A busbar holding member that holds at least one busbar that connects the energy storage elements electrically, and extends in the first direction along the plurality of energy storage elements, The system comprises a wire arranged along the busbar holding member and protruding from one end of the busbar holding member in the first direction, The busbar holding member is A first fixing part is provided at one end of the first direction and to which the electric wire is fixed, It has a second fixing part that is fixed to the end member, The end member is, A main body portion that extends along a plane direction perpendicular to the first direction and overlaps with the energy storage element when viewed from the first direction, It has an extension portion that extends from the main body portion in a direction away from the energy storage element along the first direction, The extension portion engages with the second fixed portion, and is a power storage device.

2. The energy storage device according to claim 1, wherein the second fixing portion is positioned at a location where at least a portion overlaps with or is adjacent to the first fixing portion when viewed from a second direction in which the busbar holding member, the plurality of energy storage elements, and the end member are aligned.

3. The extended portion has a through hole that penetrates in the second direction in the portion that overlaps with the busbar holding member when viewed from the second direction in which the busbar holding member, the plurality of energy storage elements, and the end member are aligned. The energy storage device according to claim 1 or 2, wherein the second fixing portion extends in the second direction and passes through the through hole.

4. The end member comprises a metal termination member and an insulating member disposed between the termination member and the energy storage element in the first direction to insulate the termination member from the energy storage element. The power storage device according to any one of claims 1 to 3, wherein the terminal member has the extended portion.

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