Power storage device

Abstract

To provide a power storage device which can be easily attached to a duct.SOLUTION: A power storage device 1 comprises: a power storage element lamination body that contains a plurality of power storage elements arranged to a predetermined direction, and that provides a channel in which a temperature adjustment fluid can be flown between the adjacent power storage elements; and an extension member 42 that is extended in a predetermined direction along the power storage element lamination body. The extension member 42 includes a fixing part 45 for fixing a duct 9 for supplying the temperature adjustment fluid to the channel.SELECTED DRAWING: Figure 9

Description

[Technical field]

[0001] The present invention relates to an energy storage device including a plurality of energy storage elements. [Background technology]

[0002] Conventionally, a power storage device including a plurality of power storage cells has been known (see Patent Document 1). This power storage device includes a case, a plurality of power storage modules, and an intake duct.

[0003] The case contains a plurality of power storage modules and a main body that constitutes a part of the intake duct. The case includes an upper case and a lower case.

[0004] Each of the energy storage modules includes a plurality of energy storage cells arranged in a predetermined arrangement direction and a plurality of spacers arranged in the arrangement direction. The plurality of energy storage cells and the plurality of spacers are arranged alternately. Each of the energy storage modules is fixed to a lower case of the case.

[0005] Each of the spacers is disposed in a gap between two adjacent power storage cells, and forms a path through which air drawn in through the intake duct flows.

[0006] The intake duct is for taking outside air into the inside of the case. The intake duct includes a main body and a cover member.

[0007] The main body has an air intake port at one end for drawing in outside air. The other end of the main body is branched into two. The two other ends of the branched main body are each connected to a power storage module. The main body is fixed to the lower case of the case.

[0008] In the energy storage device configured as above, outside air is supplied to each energy storage module by the intake duct, and flows through the paths formed between the energy storage cells by the spacers, thereby cooling each energy storage cell.

[0009] In this electricity storage device, a plurality of electricity storage modules and an intake duct are fixed to a case (lower case), and the other ends of the two branches of the main body (intake duct) are each connected to an electricity storage module.

[0010] Therefore, during manufacturing of the energy storage device, the energy storage module is aligned with respect to the case when the energy storage module is fixed to the case, and the intake duct (main body) is aligned with respect to the case when the intake duct (main body) is fixed to the case, so that the other ends of the main body that branches into two are connected to each of the energy storage modules.

[0011] In this way, since the power storage module and the air intake duct are aligned and connected to each other via being fixed to the case, the work of connecting the air intake duct to each power storage module is complicated. [Prior art documents] [Patent documents]

[0012] [Patent Document 1] JP 2020-194730 A Summary of the Invention [Problem to be solved by the invention]

[0013] Therefore, an object of this embodiment is to provide an electricity storage device to which a duct can be easily attached. [Means for solving the problem]

[0014] The power storage device of this embodiment is an electric storage element stack including a plurality of electric storage elements arranged in a predetermined direction, with a flow path through which a temperature control fluid can flow formed between adjacent electric storage elements; an extension member extending in the predetermined direction along the energy storage element stack, The extension member has a fixing portion for fixing a duct for supplying the temperature adjusting fluid to the flow path.

[0015] According to this configuration, the duct can be attached to the extension member arranged along the energy storage element stack, which makes it easy to attach the duct to the energy storage device.

[0016] In the electricity storage device, the fixing portion is attached to the extension member on a side of the energy storage element stack, The extension member may have a through hole at a position corresponding to the fixed portion.

[0017] In this way, by positioning the fixing portion on the inside of the extension member (the side of the energy storage element stack), components or portions arranged to protrude outward from the extension member are eliminated or reduced, while a through hole is provided in the extension member, making it possible to access the fixing portion from outside the extension member when fixing the duct.

[0018] In addition, the storage device the energy storage element stack includes an adjacent member disposed between adjacent energy storage elements, The adjacent member may be disposed at a position corresponding to the fixed portion in the predetermined direction, and may have a recess or a hole in which the fixed portion is housed.

[0019] In this way, by having the fixing portion housed in the recess or hole of the adjacent member, it is possible to reduce the dimension of the energy storage device in the alignment direction of the energy storage element stack and the extension member. Effect of the Invention

[0020] As described above, according to this embodiment, it is possible to provide an electricity storage device to which a duct can be easily attached. [Brief description of the drawings]

[0021] [Figure 1] FIG. 1 is a perspective view of the electricity storage device according to this embodiment. [Diagram 2] FIG. 2 is an exploded perspective view of the electricity storage device with a portion of the configuration thereof omitted. [Diagram 3] FIG. 3 is a perspective view of a second adjacent member included in the power storage device. [Figure 4] FIG. 4 is an enlarged view of the receiving portion of the second adjacent member and its surroundings. [Diagram 5] FIG. 5 is an enlarged cross-sectional view of a duct fixing portion of the electricity storage device and its periphery. [Figure 6] FIG. 6 is an enlarged vertical cross-sectional view of the duct fixing portion and its periphery of the electricity storage device. [Figure 7] FIG. 7 is an enlarged view of the vicinity of the position where the duct fixing part is arranged in the extension member included in the power storage device. [Figure 8] FIG. 8 is a perspective view of an insulator included in the power storage device. [Figure 9] FIG. 9 is a diagram for explaining a state in which a duct is attached to the electricity storage device. [Figure 10] FIG. 10 is a schematic diagram for explaining the contact area of ​​the duct fixing portion with the extension member. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] Hereinafter, an embodiment of the present invention will be described with reference to Figures 1 to 10. Note that the names of the components (elementary components) in this embodiment are those in this embodiment and may differ from the names of the components (elementary components) in the background art.

[0023] 1 and 2, the energy storage device includes a stack (energy storage element stack) L including a plurality of energy storage elements 10 arranged in a predetermined direction and having a flow path R formed between adjacent energy storage elements 10 through which a temperature regulating fluid can flow, and an extension member 42 extending in a predetermined direction along the stack L. Specifically, the energy storage device 1 includes the stack L including the plurality of energy storage elements 10, a holding member 4 that holds the stack L, at least one insulator 6 disposed between the stack L and the holding member 4, and a plurality of bus bars 8 that electrically connect different energy storage elements 10 to each other.

[0024] The laminate L has a plurality of energy storage elements 10 and a plurality of adjacent members 2. In this laminate L, the plurality of energy storage elements 10 and the plurality of adjacent members 2 are arranged alternately in the predetermined direction, and a flow path R through which a temperature regulating fluid can flow is formed between adjacent energy storage elements 10 and adjacent members 2.

[0025] Each of the multiple energy storage elements 10 is a primary battery, a secondary battery, a capacitor, or the like. The energy storage element 10 of this embodiment is a chargeable and dischargeable nonaqueous electrolyte secondary battery. More specifically, the energy storage element 10 is a lithium ion secondary battery that utilizes electron transfer that occurs with the transfer of lithium ions.

[0026] Specifically, each storage element 10 comprises an electrode body, a case 13 that houses the electrode body together with an electrolyte, an external terminal 14 at least a portion of which is exposed to the outside of the case 13, and a current collector that connects the electrode body and the external terminal 14.

[0027] In the electrode assembly, positive electrodes and negative electrodes are alternately laminated with separators interposed therebetween. In this electrode assembly, lithium ions move between the positive electrodes and the negative electrodes, thereby charging and discharging the energy storage device 10.

[0028] The case 13 has a case body 131 having an opening, and a plate-shaped cover plate 132 that blocks (closes) the opening of the case body 131. The case body 131 of this embodiment is a bottomed square cylinder, and the case 13 has a rectangular parallelepiped shape (six-sided shape). The case 13 of this embodiment has a flattened rectangular parallelepiped shape, and the multiple energy storage elements 10 are lined up in the predetermined direction with the wide faces (walls) of the case 13 (case body 131) facing each other.

[0029] In the following description, the direction in which multiple storage elements 10 are arranged (predetermined direction) is the X-axis direction of a Cartesian coordinate system, the direction in which a pair of narrow surfaces (wall portions) of case 13 face each other is the Y-axis direction of the Cartesian coordinate system, and the normal direction of cover plate 132 is the Z-axis direction of the Cartesian coordinate system.

[0030] The adjacent members 2 are insulating and are disposed between the energy storage elements 10 aligned in the X-axis direction, or between the energy storage elements 10 and a member aligned in the X-axis direction relative to the energy storage elements 10 (in this embodiment, a part of the holding member 4). The adjacent members 2 in this embodiment are made of insulating resin. As described above, the adjacent members 2 form flow paths R between adjacent energy storage elements 10, through which a temperature adjusting fluid such as air can flow.

[0031] The adjacent members 2 include a plurality of types of adjacent members, and the adjacent members 2 of this embodiment include a first adjacent member 21 arranged between the energy storage elements 10, a second adjacent member 22 arranged between the energy storage elements 10 and fixed to the holding member 4, and a third adjacent member 23 adjacent to the energy storage element 10 on the outer side of the energy storage element 10 located at the end in the X-axis direction. That is, the energy storage device 1 includes the first adjacent member 21, the second adjacent member 22, and the third adjacent member 23 as the adjacent members 2. The energy storage device 1 of this embodiment includes a plurality of first adjacent members 21, one second adjacent member 22, and two (a pair) third adjacent members 23. Each of the plurality of first adjacent members 21 is arranged between the energy storage elements 10 except between the energy storage elements 10 between which the second adjacent members 22 are arranged.

[0032] Each of the multiple first adjacent members 21 has a first main body portion 211 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 215 that restricts movement of the energy storage element 10 adjacent to the first main body portion 211 relative to the first main body portion 211. In addition, each of the multiple first adjacent members 21 forms at least one flow path R between adjacent energy storage elements 10 and through which a temperature adjustment fluid can flow.

[0033] The first main body portion 211 is a portion that faces the wide surface of the case 13 of the energy storage element 10 with a portion of the surface abutting the wide surface. This first main body portion 211 cooperates with an adjacent energy storage element 10 to form a flow path R through which a temperature adjusting fluid can flow between the energy storage element 10 and the first main body portion 211. The first main body portion 211 in this embodiment is a rectangular plate having a size corresponding to the energy storage element 10 when viewed from the X-axis direction, and has a cross-sectional shape along the XZ plane (a plane including the X-axis direction and the Z-axis direction) that is a rectangular waveform.

[0034] The first restricting portions 215 extend in the X-axis direction from at least the corners of the rectangular first main body portion 211 and come into contact with the energy storage element 10 (more specifically, case 13) adjacent to the first main body portion 211 from the outside in the YZ plane (a plane including the Y-axis direction and the Z-axis direction), thereby restricting relative movement of the energy storage element 10 in the YZ plane direction with respect to the first main body portion 211. The first restricting portions 215 in this embodiment extend from the first main body portion 211 toward both sides in the X-axis direction.

[0035] The second adjacent member (adjacent member) 22 has a second main body portion 221 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 second restricting portion 225 that restricts movement of the energy storage element 10 adjacent to the second main body portion 221 relative to the second main body portion 221. In addition, the second adjacent member 22 forms at least one flow path R between the adjacent energy storage elements 10 and through which a temperature adjustment fluid can flow. The second adjacent member 22 in this embodiment is disposed in the center position of the stack L in the X-axis direction.

[0036] The second body portion 221 is a portion that faces the wide surface of the case 13 of the energy storage element 10 with a portion of the surface abutting the wide surface. Like the first body portion 211 of the first adjacent member 21, this second body portion 221 also cooperates with the adjacent energy storage element 10 to form a flow path R between the energy storage element 10 and the second body portion 221, through which a temperature adjustment fluid can flow. The second body portion 221 of this embodiment forms a plurality of flow paths R between the second body portion 221 and the adjacent energy storage element 10. In detail, the second body portion 221 forms a plurality of flow paths R between the second body portion 221 and the adjacent energy storage element 10 on one side in the X-axis direction, and also forms a plurality of flow paths R between the second body portion 221 and the adjacent energy storage element 10 on the other side in the X-axis direction.

[0037] Specifically, second main body portion 221 has a rectangular shape with a size corresponding to adjacent energy storage elements 10 when viewed in the X-axis direction, and is a thick plate with a dimension (thickness) in the X-axis direction larger than first main body portion 211.

[0038] More specifically, as shown in Figs. 3 to 6, the second main body portion 221 has two opposing surfaces 2211 that extend in a direction perpendicular to the X-axis direction and face adjacent energy storage elements 10 (wide surfaces of the case 13) at each of one end and the other end in the X-axis direction, and a plurality of protrusions 2212 protruding from each opposing surface 2211. The second main body portion 221 has at least one accommodation portion 223 that accommodates a part of the holding member 4 at each end surface 2213 in the Y-axis direction. The second main body portion 221 also has a fixing portion 224 for fixing the second main body portion 221 to the holding member 4 at each end surface 2213 in the Y-axis direction. The second main body portion 221 of this embodiment has a plurality of fixing portions 224 at each end surface 2213 in the Y-axis direction. A chamfered portion 2213a is formed at the end of each end surface 2213 of the second main body portion 221 in the X-axis direction. The chamfered portion 2213a is a surface that is inclined with respect to both the opposing surface 2211 and the end surface 2213.

[0039] On each opposing surface 2211, the multiple protrusions 2212 each extend in the Y-axis direction and are disposed at intervals in the Z-axis direction. Each of the multiple protrusions 2212 has a tip in the protruding direction (X-axis direction) abutting against the energy storage element 10 adjacent to the second main body portion 221. As a result, a flow path R is formed on one side in the X-axis direction of the second main body portion 221 by the opposing surface 2211 on one side in the X-axis direction, the two protrusions 2212 adjacent to each other at an interval in the Z-axis direction on the opposing surface 2211, and the energy storage element 10 (case 13) opposing the opposing surface 2211 on one side in the X-axis direction. In addition, a flow path R is formed on the other side of the X-axis direction of the second main body portion 221 by the opposing surface 2211 on the other side in the X-axis direction, two adjacent protrusions 2212 spaced apart in the Z-axis direction on the opposing surface 2211, and the storage element 10 (case 13) facing the opposing surface 2211 on the other side in the X-axis direction.

[0040] The accommodating portion 223 is a recess or hole extending in the Y-axis direction, and accommodates a portion (in this embodiment, the duct fixing portion 45) protruding from a position facing the end face 2213 of the second main body portion 221 in the holding member 4 toward the stacked body L in the Y-axis direction from the position. That is, the second main body portion 221 has the number of accommodating portions 223 corresponding to the number of duct fixing portions 45 of the holding member 4. The accommodating portions 223 in this embodiment are recesses, and one is provided in the center of each end face 2213 of the second main body portion 221 in the Z-axis direction.

[0041] Specifically, the storage section (recess) 223 has an inner peripheral surface 223a of a shape corresponding to the duct fixing section 45 when viewed from the Y-axis direction, and the inner peripheral surface 223a of the storage section 223 in this embodiment is rectangular, more specifically, rectangular with arc-shaped corners, when viewed from the Y-axis direction. The opening periphery 2231a of the storage section 223 is tapered (chamfered) toward the opening direction (outward in the Y-axis direction). In addition, the depth dimension of the storage section (recess) 223 is greater than the dimension of the duct fixing section 45 housed in the storage section 223 in the protruding direction (Y-axis direction).

[0042] The multiple fixing portions 224 are lined up at intervals in the Z-axis direction on the Y-axis end face 2213 of the second main body portion 221. In this embodiment, two fixing portions 224 are arranged at intervals in the Z-axis direction on each end face 2213 in the Y-axis direction of the second main body portion 221, and the accommodation portion 223 is arranged between these two fixing portions 224 (more specifically, at the center in the Z-axis direction). Moreover, the two fixing portions 224 are disposed inward (on the accommodating portion 223 side) from the second restricting portion 225 of the second adjacent member 22 in the Z-axis direction. Each fixing portion 224 in this embodiment is an insert nut, and the second main body portion 221 is fixed to the holding member 4 by a connecting member N such as a screw penetrating the holding member 4 engaging (screwing) with the insert nut.

[0043] The second restricting portions 225 extend in the X-axis direction from at least corners (corners when viewed from the X-axis direction) of the rectangular second main body portion 221 and abut against the energy storage element 10 (more specifically, case 13) adjacent to the second main body portion 221 from the outside in the YZ plane direction, thereby restricting relative movement of the energy storage element 10 in the YZ plane direction with respect to the second main body portion 221. The second restricting portions 225 in this embodiment extend from the second main body portion 221 toward both sides in the X-axis direction.

[0044] Each of the two third adjacent members 23 has a third main body portion 231 that extends in a direction perpendicular to the X-axis direction between the energy storage elements 10 adjacent in the X-axis direction and the holding member 4 (more specifically, the terminal member 41), and at least one third restricting portion 235 that restricts movement of the energy storage elements 10 adjacent to the third main body portion 231 relative to the third main body portion 231. In addition, each of the two third adjacent members 23 forms at least one flow path R between the adjacent energy storage elements 10 and the third adjacent members 23, through which a temperature adjustment fluid can flow.

[0045] The third main body portion 231 is a portion that faces the wide surface of the case 13 of the energy storage element 10 with a portion of the surface abutting against it. Like the first main body portion 211 of the first adjacent member 21 and the second main body portion 221 of the second adjacent member 22, this third main body portion 231 also cooperates with the adjacent energy storage element 10 to form a flow path R between the energy storage element 10 and the third main body portion 231, through which a temperature adjustment fluid can flow. The third main body portion 231 of this embodiment forms a plurality of flow paths R between the adjacent energy storage elements 10.

[0046] Specifically, the third main body portion 231 has a rectangular plate shape with a size corresponding to the adjacent energy storage elements 10 when viewed from the X-axis direction. More specifically, the third main body portion 231 has two opposing surfaces 2311 that extend in a direction perpendicular to the X-axis direction at each of one end and the other end in the X-axis direction and that face the adjacent energy storage elements 10 (wide surfaces of the case 13) or terminal member 41, and a plurality of protruding strips 2312 that protrude from the opposing surface 2311 on the energy storage element 10 side.

[0047] On the opposing surface 2311 on the energy storage element 10 side, each of the multiple protrusions 2312 extends in the Y-axis direction and is arranged at intervals in the Z-axis direction. Each of the multiple protrusions 2312 has a tip in the protruding direction (X-axis direction) abutting the energy storage element 10 adjacent to the third main body portion 231. As a result, a flow path R is formed on the energy storage element 10 side of the third main body portion 231 by the opposing surface 2311 on the energy storage element 10 side, the two protrusions 2312 adjacent to each other at an interval in the Z-axis direction on the opposing surface 2311, and the energy storage element 10 (case 13) opposing the opposing surface 2311.

[0048] The third restricting portion 235 extends in the X-axis direction from at least the corners of the rectangular third main body portion 231 and abuts against the energy storage element 10 (more specifically, case 13) adjacent to the third main body portion 231 from the outside in the YZ plane direction, thereby restricting relative movement of the energy storage element 10 in the YZ plane direction with respect to the third main body portion 231. The third restricting portion 235 of the present embodiment extends from the third main body portion 231 toward one side in the X-axis direction (the energy storage element 10 side).

[0049] The holding member 4 surrounds the periphery of the stack L to collectively hold the multiple energy storage elements 10 and multiple adjacent members 2 included in the stack L. This holding member 4 is made of metal. Specifically, the holding member 4 has a pair of end members 41 arranged on both sides of the stack L in the X-axis direction, a pair of extension members 42 connecting the pair of end members 41, and multiple connecting members 43 connecting the end members 41 and the extension members 42. In addition, the holding member 4 has a duct fixing portion (fixing portion) 45 for fixing a duct 9 (see FIG. 9) for supplying a temperature adjustment fluid to each flow path R.

[0050] Each of the pair of end members 41 is arranged so as to sandwich the third adjacent member 23 between the stack L, more specifically, the energy storage element 10 arranged at the end (outermost) in the X-axis direction of the stack L. Each of the pair of end members 41 is a rectangular plate having a size corresponding to that of the energy storage element 10 when viewed from the X-axis direction, and the rigidity of each end member 41 is higher than that of the third adjacent member 23. Each end member 41 has a plurality of through holes 411 arranged at intervals in the Z-axis direction at both ends in the Y-axis direction.

[0051] Each of the pair of extension members 42 is disposed on either side of the laminate L in the Y-axis direction, and extends in the X-axis direction from one end member 41 to the other end member 41 along the laminate L. Each extension member 42 has a pair of beam portions 421 extending in the X-axis direction and spaced apart in the Z-axis direction, a pair of end connection portions 422 extending in the Z-axis direction and connecting ends of the pair of beam portions 421, and an intermediate connection portion 425 extending in the Z-axis direction at a midpoint in the X-axis direction and connecting the pair of beam portions 421. The extension member 42 of this embodiment has a plurality of intermediate connection portions 425.

[0052] One of the pair of beam portions 421, beam portion 421a, extends in the X-axis direction at a position in the Z-axis direction corresponding to the end portion of each energy storage element 10 on the external terminal 14 side, and the other beam portion 421b of the pair of beam portions 421 extends in the X-axis direction at a position in the Z-axis direction corresponding to the end portion on the opposite side to the external terminal 14 side of each energy storage element 10.

[0053] Each of the pair of end connectors 422 extends in the Z-axis direction from one beam portion 421a to the other beam portion 421b at a position corresponding to the termination member 41 in the X-axis direction. Each end connector 422 has a fixing piece 423 that extends along the outer surface of the termination member 41 in the X-axis direction, and the fixing piece 423 has a through hole 424 at a position that overlaps with the through hole 411 of the termination member 41 when viewed from the X-axis direction.

[0054] The multiple intermediate connectors 425 include a first connector 4251 that is disposed in the center in the X-axis direction, and second connectors 4252 that are the remaining portions.

[0055] The first connecting portion 4251 is a portion to which the second adjacent member 22 is fixed. The first connecting portion 4251 has a width dimension (dimension in the X-axis direction) larger than that of the second connecting portion 4252, and is a band-shaped portion extending in the Z-axis direction from one beam portion 421a to the other beam portion 421b. The first connecting portion 4251 also has at least one first through hole 4251a used to fix the duct 9 and a second through hole 4251b used to fix the second adjacent member 22 to the extension member 42.

[0056] The first through hole 4251a is disposed at a position overlapping with the accommodation portion 223 of the second adjacent member 22 when viewed from the Y-axis direction. One first through hole 4251a is disposed in the first connection portion 4251 of the present embodiment, and this first through hole 4251a is disposed at the center in the Z-axis direction of the first connection portion 4251. When the duct 9 is fixed to the electricity storage device 1, a member for fixing the duct 9 to the extension member 42 (in the example of this embodiment, a fixing bolt LB: see FIG. 9) is inserted into this first through hole 4251a.

[0057] The second through hole 4251b is disposed at a position overlapping with the fixing portion 224 of the second adjacent member 22 when viewed from the Y-axis direction. Since the second adjacent member 22 of this embodiment has two fixing portions 224 on each end face 2213, two second through holes 4251b are disposed in the first connecting portion 4251. A connecting member N for fixing the second adjacent member 22 to the extension member 42 is inserted into each second through hole 4251b. This connecting member N engages with the fixing portion 224 of the second adjacent member 22.

[0058] Each of the multiple connecting members 43 connects the end member 41 and the extension member 42 in a state where it is inserted through the through hole 411 of the end member 41 and the through hole 424 of the extension member 42 (fixing piece 423). Each connecting member 43 in this embodiment is composed of a bolt 431 and a nut 432.

[0059] As shown in Fig. 2 and Fig. 5 to Fig. 7, the duct fixing part 45 is attached to the stack L side of the extension member 42 (specifically, the first connecting part 4251). Specifically, the duct fixing part 45 is disposed at a position corresponding to the first through hole 4251a on the stack L side of the first connecting part 4251. The duct fixing part 45 of this embodiment is a weld nut, and is attached to the first connecting part 4251 (extension member 42) by welding at a position where the screw hole coincides with the first through hole 4251a. The surface of the duct fixing part 45 on the side that comes into contact with the first connecting part 4251 is rectangular.

[0060] The insulator 6 has insulating properties. As shown in Fig. 2, the insulator 6 is disposed between the extension member 42 and the stack L (the plurality of energy storage elements 10). Specifically, the energy storage device 1 includes a pair of insulators 6, and each insulator 6 covers at least a region of the extension member 42 facing the stack L. As also shown in Fig. 8, a portion (central connection portion) 61 corresponding to the first connecting portion 4251 of the insulator 6 extends in the Z-axis direction along the first connecting portion 4251 at the center in the X-axis direction, and has through holes 63 and 64 at positions corresponding to the first through hole 4251a and the second through hole 4251b of the first connecting portion 4251, respectively.

[0061] 5, the central connecting portion 61 has two seal portions 65 that protrude from both ends in the width direction (X-axis direction) on the surface on the laminate L side toward the laminate L and extend along the Z-axis direction. The protruding tip of each of these two seal portions 65 abuts against the chamfered portion 2213a of the second adjacent member 22. Each seal portion 65 extends endlessly (annularly) so as to abut against the second adjacent member 22, the first restricting portion 215 of each first adjacent member 21, and the third adjacent member 23.

[0062] Each of the bus bars 8 is a plate-like member having electrical conductivity, such as metal. Each bus bar 8 electrically connects the external terminals 14 of the energy storage elements 10 to each other. The bus bars 8 of the present embodiment connect (connect) the energy storage elements 10 included in the energy storage device 1 in series.

[0063] Ducts 9 are connected to the energy storage device 1 of this embodiment in order to control (adjust) the temperature of each energy storage element 10 during use. In the energy storage device 1 of this embodiment, as shown in Fig. 9, one duct 9 is connected to the supply side of the temperature adjustment fluid with two energy storage devices 1 stacked in the Z-axis direction. In addition, one duct 9 is also connected to the discharge side of the temperature adjustment fluid. Note that only the supply side duct 9 is shown in Fig. 9.

[0064] The duct 9 has two bolt insertion portions 91 through which the fixing bolts LB are inserted, and these two bolt insertion portions 91 are disposed at positions corresponding to the duct fixing portions 45 attached to the extension members 42 of the two stacked energy storage devices 1, respectively. The bolt insertion portion 91 in this embodiment has a cylindrical collar extending toward the energy storage device 1, and the duct 9 is attached (fixed) to the energy storage device 1 with the tip of the collar abutting against the extension member 42 (more specifically, the first connecting portion 4251). The duct 9 is fixed to the energy storage device 1 by engaging (screwing) the fixing bolts LB inserted through the bolt insertion portions 91 with the duct fixing portions (weld nuts) 45 of the energy storage devices 1 with the duct 9 pressed against the side portions (end portions in the Y-axis direction) of the two stacked energy storage devices 1. At this time, the tip of the fixing bolt LB is inserted into the receiving portion 223 of the second adjacent member 22 further inward than the duct fixing portion 45 (to the back side of the recess).

[0065] In the electricity storage device 1 configured as above, the duct 9 can be attached to the extension member 42 arranged along the laminate L, so that the duct 9 can be easily attached to the electricity storage device 1.

[0066] In the power storage device 1 of the present embodiment, the duct fixing portion 45 is attached to the inner side (laminated body L side) of the extension member 42, and the extension member 42 has a first through hole 4251a at a position corresponding to the duct fixing portion 45. In this way, by arranging the duct fixing portion 45 inside the extension member 42, while eliminating or reducing the members or parts arranged to protrude outward in the Y-axis direction from the extension member 42, a first through hole 4251a is provided in the extension member 42 to enable access from the outside of the extension member 42 to the duct fixing portion 45 when fixing the duct 9.

[0067] Also, in the power storage device 1 of the present embodiment, the second adjacent member 22 is arranged at a position corresponding to the duct fixing portion 45 in the X-axis direction and has a housing portion 223 for housing the duct fixing portion 45. In this way, by housing the duct fixing portion 45 protruding inward (laminated body L side) from the extension member 42 in the housing portion 223 of the second adjacent member 22, the dimensions of the power storage device 1 in the Y-axis direction (that is, the arrangement direction of the laminated body L and the extension member 42) can be suppressed.

[0068] Also, in the power storage device 1 of the present embodiment, since the surface of the duct fixing portion 45 on the side in contact with the first connecting portion 4251 is square, as shown in FIG. 10, compared with the case where the surface is circular 450, the contact area with the first connecting portion 4251 is increased by the amount of the corners (the hatched portions in FIG. 10). Thereby, when the fixing bolt LB is tightened when fixing the duct 9 and the tip of the bolt insertion portion 91 (collar) of the duct 9 is pressed against, the crushing of the peripheral edge portion of the first through hole 4251a in the first connecting portion 4251 is prevented.

[0069] Note that the power storage device of the present invention is not limited to the above embodiment, and it goes without saying that various changes can be made without departing from the gist of the present invention. For example, the configuration of another embodiment can be added to the configuration of a certain embodiment, and a part of the configuration of a certain embodiment can be replaced with the configuration of another embodiment. Further, a part of the configuration of a certain embodiment can be deleted.

[0070] In the energy storage device 1 of the above embodiment, the extension member 42 has one duct fixing portion 45, but is not limited to this configuration. The extension member 42 may have a plurality of duct fixing portions 45.

[0071] The arrangement position (attachment position) of the duct fixing portion 45 is not limited. For example, in the energy storage device 1 of the above embodiment, the duct fixing portion 45 is arranged inside the extension member 42 (on the stack L side), but it may be arranged outside the extension member 42. In addition, the duct fixing portion 45 may be arranged at a portion of the extension member 42 other than the first connecting portion 4251, such as the beam portion 421, the end connecting portion 422, or the second connecting portion 4252.

[0072] In the above embodiment, the ducts 9 are connected to the supply side and discharge side of the temperature control fluid for two power storage devices 1 arranged (stacked) in the Z-axis direction, but the configuration is not limited to this. The ducts 9 may be connected to the supply side and discharge side of the temperature control fluid for one power storage device 1, or may be connected to the supply side and discharge side of the temperature control fluid for three or more power storage devices 1 arranged in the Z-axis direction.

[0073] In the above embodiment, the case where the storage element is used as a chargeable and dischargeable non-aqueous electrolyte secondary battery (for example, a lithium ion secondary battery) has been described, but the type and size (capacity) of the storage element are arbitrary. In the above embodiment, the lithium ion secondary battery has been described as an example of the storage element, but the present invention is not limited thereto. For example, the present invention is also applicable to storage elements of various secondary batteries, primary batteries, and capacitors such as electric double layer capacitors. [Explanation of symbols]

[0074] 1...electricity storage device, 2...adjacent member, 21...first adjacent member, 211...first main body portion, 215...first regulating portion, 22...second adjacent member (adjacent member), 221...second main body portion, 2211...opposing surface, 2212...protruding strip, 2213...end surface in the Y-axis direction, 2213a...chamfered portion, 223...accommodating portion (recess or hole), 223a...inner circumferential surface, 2231a...opening peripheral portion, 224...fixing portion, 225...second regulating portion, 23...third adjacent member, 231...third main body portion, 2311...opposing surface, 2312...protruding strip, 235...third regulating portion, 4...holding member, 41...terminating member, 411...through hole, 42...extending member, 421, 421a, 421b...beam portion, 422...end connection portion, 423...fixing piece, 424...through hole, 425...intermediate connection portion, 4251...first connection portion, 4251a...first through hole, 4251b...second through hole, 4252...second connection portion, 43...connection member, 431...bolt, 432...nut, 45...duct fixing portion (fixing portion), 6...insulator, 61...central connection portion, 63, 64...through hole, 65...seal portion, 8...bus bar, 9...duct, 91...bolt insertion portion, 10...energy storage element, 13...case, 131...case body, 132...cover plate, 14...external terminal, L...laminated body, LB...fixing bolt, N...connection member, R...flow path

Claims

1. an electric storage element stack including a plurality of electric storage elements arranged in a predetermined direction, with a flow path through which a temperature control fluid can flow formed between adjacent electric storage elements; an extension member extending in the predetermined direction along the energy storage element stack, the energy storage element stack includes an adjacent member disposed between adjacent energy storage elements, the extension member has a fixing portion for fixing a duct for supplying the temperature control fluid to the flow path, the fixing portion being in contact with the extension member from the outside and at which the duct is fixed; the fixing portion is attached to the extension member on a side of the energy storage element stack and protrudes toward the energy storage element stack, the adjacent member is disposed at a position corresponding to the fixed portion in the predetermined direction, and has a recess or a hole in which the fixed portion is accommodated, A power storage device, wherein a depth dimension of the recess or the hole in a protruding direction of the fixing portion is greater than a protruding dimension of the fixing portion.

2. An energy storage device as described in claim 1, wherein the extension member has a through hole at a position corresponding to the fixed portion.

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