Power storage device

Abstract

A power storage device according to the present embodiment comprises: a laminate which includes a first power storage element and a second power storage element aligned in a first direction; a long member which overlaps the laminate in a second direction orthogonal to the first direction; and a bus bar arrangement member. The bus bar arrangement member comprises: two body parts arranged on both sides of the long member in a third direction orthogonal to the first direction and the second direction; and a connection part which connects the two body parts. An engagement part of the long member for engaging with the laminate is located between the laminate and the connection part. The connection part has a viewing area that enables the engagement part to be viewed.

Description

Power storage device Cross-reference to related applications

[0001] This application claims the priority of Japanese Patent Application No. 2025-010851, and the content of Japanese Patent Application No. 2025-010851 is incorporated into the description of this application by reference.

[0002] The present invention relates to a power storage device including a plurality of power storage elements.

[0003] Patent Document 1 discloses an assembled battery including a single battery group in which a plurality of single battery units are stacked, a bus bar, and bus bar holders disposed on both sides of the single battery group.

[0004] In the above-described assembled battery, it was difficult to externally confirm the configuration of members disposed between the bus bar holder and the single battery group.

[0005] Japanese Patent Application Laid-Open No. 2024-152923

[0006] Therefore, an object of the present embodiment is to provide a power storage device in which an engagement portion between a long member located between a laminate and a bus bar arrangement member and the laminate can be visually recognized from the outside.

[0007] The power storage device of the present embodiment includes: a laminate including a first power storage element and a second power storage element arranged in a first direction; a long member extending in the first direction and overlapping the laminate in a second direction orthogonal to the first direction; and a bus bar arrangement member on which a bus bar connecting the first power storage element and the second power storage element is disposed. The bus bar arrangement member includes two main body portions disposed on one side and the other side of the long member in a third direction orthogonal to the first direction and the second direction, respectively, and a connecting portion connecting the two main body portions. The long member engages with the laminate, and an engagement portion between the long member and the laminate is located between the laminate and the connecting portion. The connecting portion has a visual recognition portion that can visually recognize the engagement portion from the side opposite to the laminate in the second direction.

[0008] Figure 1 is a perspective view of the energy storage device according to this embodiment. Figure 2 is an exploded perspective view of the energy storage device. Figure 3 is a perspective view of the main body of the energy storage device. Figure 4 is an exploded perspective view of the main body of the device. Figure 5 is a perspective view of the first adjacent member of the energy storage device. Figure 6 is a perspective view of the second adjacent member of the energy storage device. Figure 7 is a view of the elongated member of the energy storage device from the Y-axis direction. Figure 8 is a view of the elongated member from the other side in the Z-axis direction. Figure 9 is a diagram illustrating the engagement state between the elongated member and the main body of the device. Figure 10 is an enlarged view of the range indicated by X in Figure 2. Figure 11 is an enlarged view of the range indicated by X in Figure 2 from one side in the Z-axis direction. Figure 12 is a cross-sectional view of the position XII-XII in Figure 11. Figure 13 is an enlarged view of the range corresponding to the range indicated by X in Figure 2 in the energy storage device, viewed from one side in the Z-axis direction.

[0009] (1) An energy storage device according to one embodiment of the present invention comprises: a laminate including a first energy storage element and a second energy storage element arranged in a first direction; an elongated member extending in the first direction and superimposed on the laminate in a second direction perpendicular to the first direction; and a busbar arrangement member on which a busbar connecting the first energy storage element and the second energy storage element is arranged, wherein the busbar arrangement member comprises: two main body portions arranged on one side and the other side of the elongated member in a third direction perpendicular to the first direction and the second direction, respectively; and a connecting portion connecting the two main body portions, wherein the elongated member engages with the laminate, the engaging portion of the elongated member is located between the laminate and the connecting portion, and the connecting portion has a viewing portion that allows the engaging portion to be seen from the opposite side of the laminate in the second direction.

[0010] According to the energy storage device of one embodiment of the present invention, even if the engagement portion of the long member with the laminate is located between the laminate and the connecting portion (busbar arrangement member), the engagement portion of the long member with the laminate can be visually observed (i.e., the engagement state can be confirmed) through the viewing portion.

[0011] (2) In the energy storage device described in (1) above, the elongated member may be a duct that guides the fluid discharged from the first energy storage element or the second energy storage element in the first direction.

[0012] According to the energy storage device described in (2) above, when a fluid such as gas is released from the first energy storage element or the second energy storage element, the fluid can be guided to a predetermined position.

[0013] (3) In the energy storage device described in (1) or (2) above, the laminate comprises an adjacent member disposed between the first energy storage element and the second energy storage element, the adjacent member has an engaging portion at the end closest to the duct portion (long member), and the engaging portion of the duct portion may engage with the engaging portion of the adjacent member.

[0014] According to the energy storage device described in (3) above, since no members other than adjacent members are required to engage the duct section (long member), costs can be reduced.

[0015] (4) In the energy storage device described in (3) above, the engaging portion comprises a first engaging portion located at one end of the duct portion (long member) in the third direction and a second engaging portion located at the other end, and the engaged portion may comprise a first engaged portion that engages with the first engaging portion and a second engaged portion that engages with the second engaging portion.

[0016] According to the energy storage device described in (4) above, the duct portion (long member) can be firmly engaged with adjacent members by engaging with them at both ends in the third direction.

[0017] (5) In the energy storage device described in (4) above, the viewing portion may be positioned at the connection portion at a position corresponding to the first engagement portion in the third direction and at a position corresponding to the second engagement portion.

[0018] According to the energy storage device described in (5) above, each engagement point (first engagement part and first engaged part, and second engagement part and second engaged part) between the duct part (long member) and the adjacent member can be visually inspected (confirmed).

[0019] Hereinafter, one embodiment of the present invention will be described with reference to Figures 1 to 13. 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.

[0020] As shown in Figures 1 to 4, the energy storage device 1 includes a laminate D containing a first energy storage element 10A (see Figure 4) and a second energy storage element 10B (see Figure 4) arranged in a first direction, a long member 6 extending in the first direction and superimposed on the laminate D in a second direction perpendicular to the first direction, and a cover portion C housing a busbar B connecting the first energy storage element 10A and the second energy storage element 10B. In this embodiment, in the laminate D, one of the two adjacent energy storage elements 10 may be referred to as the first energy storage element 10A, and the other energy storage element 10 may be referred to as the second energy storage element 10B.

[0021] Specifically, the energy storage device 1 comprises a device body A having a plurality of energy storage elements 10 arranged in a first direction, a long member 6 attached to the device body A, and a cover portion C superimposed on the portion of the device body A to which the long member 6 is attached. The energy storage device 1 also includes a seal portion 7 (see Figure 2) positioned between the device body A and the long member 6. In the following, the first direction in which the plurality of energy storage elements 10 are arranged is defined as the X-axis direction of the Cartesian coordinate system, the direction in which the device body A and the cover portion C are arranged, the direction in which the device body A and the long member 6 are arranged (second direction) is defined as the Z-axis direction of the Cartesian coordinate system, and the direction perpendicular to the X-axis direction and the Z-axis direction (third direction) is defined as the Y-axis direction of the Cartesian coordinate system.

[0022] The device body A comprises a laminate D having a plurality of energy storage elements 10 and a plurality of adjacent members 2, wherein the energy storage elements 10 and adjacent members 2 are arranged alternately in the X-axis direction, and a holding part 3 that holds the laminate D. The device body A also comprises a first fixing part 4 that fixes at least one adjacent member 2 to the holding part 3, and an insulator 5 that insulates the space between the laminate D and the holding part 3.

[0023] The multiple energy storage elements 10 include primary batteries, secondary batteries, capacitors, 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.

[0024] Specifically, the energy storage element 10 comprises an electrode body, a case 11 that houses the electrode body together with an electrolyte, terminals 14 that at least a portion of which are exposed to the outside of the case 11, and a current collector that connects the electrode body and the terminals 14 (see Figure 4). The energy storage element 10 of this embodiment is provided with a pair of terminals 14, and these terminals 14 are spaced apart in the Y-axis direction at one end of the energy storage element 10 in the Z-axis direction (upper side in Figure 4).

[0025] 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.

[0026] The case 11 comprises a case body 12 having an opening at one end in the Z-axis direction, and a plate-shaped cover plate 13 that closes (closes) the opening of the case body 12. The case body 12 has a rectangular tube shape (i.e., a bottomed rectangular tube shape) with the other end in the Z-axis direction (the lower side in Figure 4) closed, and the case 11 has a rectangular parallelepiped shape (hexagonal shape).

[0027] Specifically, the case body 12 comprises a plate-shaped closing portion 121 and a cylindrical body portion (peripheral wall) 122 extending from the periphery of the closing portion 121.

[0028] 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 Z-axis direction.

[0029] The body portion 122 is rectangular in shape, more specifically, a flattened rectangular shape. The body portion 122 comprises 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 ends of the pair of long wall portions 123 that are opposite each other in the X-axis direction, thereby forming the rectangular body portion 122.

[0030] The cover plate 13 is a plate-shaped member that closes the opening of the case body 12. This cover plate 13 comprises a rectangular plate-shaped cover plate body 131 that is elongated in the Y-axis direction, and a gas discharge valve 132 that is positioned on the cover plate body 131. The case 11 is formed when the cover plate 13 is joined to the case body 12 with its peripheral edge overlapping the peripheral edge of the opening of the case body 12.

[0031] 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 Y-axis direction. In this embodiment, the gas discharge valve 132 is circular when viewed from the Z-axis direction.

[0032] The pair of terminals 14 are parts that are electrically connected to terminals 14 of other energy storage elements 10 or to external devices, etc. The terminals 14 are formed from a conductive material. The terminals 14 are formed from highly weldable metal materials such as aluminum or aluminum alloys, copper or copper alloys, etc.

[0033] The pair of terminals 14 are located at both ends of the cover plate 13 in the Y-axis direction. That is, the pair of terminals 14 are positioned on the cover plate 13 with the gas exhaust valve 132 in between.

[0034] The energy storage elements 10 described above are flattened rectangular parallelepipeds. Multiple energy storage elements 10 are arranged in the X-axis direction with their wide surfaces (long walls 123) facing each other via adjacent members 2. At this time, the gas discharge valves 132 of each energy storage element 10 are arranged in a line in the X-axis direction. In addition, one terminal 14 and the other terminal 14 of each energy storage element 10 are aligned in the X-axis direction at each position with the gas discharge valve 132 in between.

[0035] Multiple adjacent members 2 are insulating and are arranged between energy storage elements 10 aligned in the X-axis direction, or between an energy storage element 10 and a member aligned in the X-axis direction relative to the energy storage element 10 (in this embodiment, the terminal portion 31 which is part of the holding portion 3). The adjacent members 2 in this embodiment 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 adjacent energy storage elements 10. These multiple adjacent members 2 include multiple types of adjacent members 2A, 2B, and 2C.

[0036] Specifically, the plurality of adjacent members 2 include intermediate adjacent members (adjacent members) 2A, 2B positioned between the first energy storage element 10A and the second energy storage element 10B (i.e., between two adjacent energy storage elements 10), and an end adjacent member 2C adjacent to the energy storage element 10 between the holding portion 3 and the energy storage element 10 at the outermost end in the X-axis direction. In the device body A of this embodiment, a plurality of intermediate adjacent members are arranged, and these plurality of intermediate adjacent members include a first adjacent member 2A positioned between the first energy storage element 10A and the second energy storage element 10B and not fixed to the holding portion 3, and a second adjacent member 2B positioned between the first energy storage element 10A and the second energy storage element 10B and fixed to the holding portion 3.

[0037] The energy storage device 1 of this embodiment comprises a plurality of first adjacent members 2A, one second adjacent member 2B, and two (a pair) of end adjacent members 2C, with each of the plurality of first adjacent members 2A being positioned between each energy storage element 10, excluding the spaces between the energy storage elements 10 where the second adjacent members 2B are located.

[0038] As shown in Figure 5, the first adjacent member 2A has an engaging portion 222A at the end closest to the elongated member 6. Specifically, the first adjacent member 2A comprises a first main body portion 21A located between the first energy storage element 10A and the second energy storage element 10B, and at least one first engaging piece 22A extending from the first main body portion 21A and engaging with the elongated member 6. In this embodiment, engagement means connecting by interlocking, for example, by hooking.

[0039] More specifically, the first adjacent member 2A comprises a first main body portion 21A extending in a plane direction perpendicular to the X-axis direction between the first energy storage element 10A and the second energy storage element 10B, and at least one (two in this embodiment) first engaged piece 22A extending (protruding) from the first main body portion 21A toward one side in the Z-axis direction and engaging with the elongated member 6. The first adjacent member 2A also has at least one first restricting portion 23A that restricts the movement of the energy storage elements 10 (first energy storage element 10A and second energy storage element 10B) adjacent to the first main body portion 21A relative to the first main body portion 21A.

[0040] The first main body portion 21A is a portion that faces the long wall portion 123 of the case 11 of the energy storage element 10, while partially contacting the long wall portion 123. 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 that is the same size as or approximately the same size as the energy storage element 10 when viewed from the X-axis direction, and its cross-sectional shape along the X-Z plane (the plane including the X-axis direction and the Z-axis direction) is a rectangular wave shape.

[0041] The two first engaging pieces 22A extend from positions spaced apart in the Y-axis direction at one end of the first main body portion 21A in the Z-axis direction. The distance between these two first engaging pieces 22A in the Y-axis direction is the same as or approximately the same as the dimension of the elongated member 6 in the Y-axis direction. Furthermore, the first engaging pieces 22A are plate-shaped with the Y-axis direction as the thickness direction (in other words, plate-shaped along the X-Z plane).

[0042] Specifically, each of the two first engaged pieces 22A has an engaged piece main body 221A extending in the Z-axis direction along the long member 6 from the first main body part 21A, and an engaged part 222A engaging with the long member 6 (specifically, an engaging part 65 of a long member main body 60 described later).

[0043] The engaged piece main body 221A is a strip-shaped part extending straight from the first main body part 21A to one side in the Z-axis direction. The engaged piece main body 221A of the present embodiment is a strip shape with a constant dimension in the X-axis direction at each position in the Z-axis direction.

[0044] The engaged part 222A is a part extending in the X-axis direction (the direction in which the long member 6 extends) from a position spaced apart from the first main body part 21A to one side in the Z-axis direction in the engaged piece main body 221A. The engaged part 222A of the present embodiment extends to one side and the other side in the X-axis direction from the engaged piece main body 221A. That is, the first engaged piece 22A has two engaged parts 222A.

[0045] The first restricting part 23A extends in the X-axis direction from at least a corner of the rectangular first main body part 21A, and restricts the relative movement of the power storage element 10 (specifically, the case 11) adjacent to the first main body part 21A in the Y-Z plane direction by abutting against it from the outside in the Y-Z plane direction. The first restricting part 23A of the present embodiment extends from the first main body part 21A toward one side and the other side in the X-axis direction.

[0046]

[0047] ​More specifically, the second adjacent member 2B includes a second main body portion 21B that extends in a plane direction orthogonal to the X-axis direction between the first power storage element 10A and the second power storage element 10B, and at least one (two in the example of this embodiment) second engaged piece 22B that extends (projects) from the second main body portion 21B toward one side in the Z-axis direction and engages with the long member 6. Further, the second adjacent member 2B has at least one second restricting portion 23B that restricts the movement of the power storage element 10 (the first power storage element 10A and the second power storage element 10B) adjacent to the second main body portion 21B with respect to the second main body portion 21B, and a second fixing portion 24B that is used for fixing the second adjacent member 2B to the holding portion 3.

[0048] The second main body portion 21B is a portion that faces the long wall portion 123 of the case 11 of the power storage element 10 while being in contact with a part of the long wall portion 123. This second main body portion 21B forms a flow path R through which a fluid for temperature adjustment can flow between the power storage element 10 in cooperation with the adjacent power storage element 10. The dimension of the second main body portion 21B in the X-axis direction in this embodiment is larger (i.e., thicker) than the dimension of the first main body portion 21A in the X-axis direction. Further, the second main body portion 21B is in the shape of a rectangular plate having the same or substantially the same size as the power storage element 10 when viewed from the X-axis direction. The second main body portion 21B includes a plurality of convex ridges 211B that each extend in the Y-axis direction and are arranged at intervals in the Z-axis direction. These plurality of convex ridges 211B project from the opposing surface 212B of the second main body portion 21B with respect to the power storage element 10.

[0049] The two second engaged pieces 22B extend from positions spaced apart in the Y-axis direction at one end of the second main body portion 21B in the Z-axis direction. The interval between these two second engaged pieces 22B in the Y-axis direction is the same as or substantially the same as the dimension of the long member 6 in the Y-axis direction, similar to the two first engaged pieces 22A of the first adjacent member 2A. Each configuration of this second engaged piece 22B is the same as the configuration of the first engaged piece 22A. That is, the second engaged piece 22B has an engaged piece main body 221B and an engaged portion 222B.

[0050] The second restricting portion 23B 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 Y-Z plane direction by contacting it from the outside in the Y-Z plane direction. In this embodiment, the second restricting portion 23B extends from the second main body portion 21B toward one side and the other side in the X-axis direction.

[0051] The second fixing portion 24B is located at each end of the second main body portion 21B in the Y-axis direction. These multiple second fixing portions 24B engage with the first fixing portion 4 to fix the second adjacent member 2B and the holding portion 3. In this embodiment, the second fixing portion 24B is an insert nut. In this embodiment, the first fixing portion 4 is a bolt, which penetrates the holding portion 3 and engages with (for example, screws into) the second fixing portion 24B to fix the holding portion 3 to the second adjacent member 2B.

[0052] Each of the two end adjacent members 2C has a third main body portion 21C that overlaps with the energy storage element 10 when viewed from the X-axis direction, and at least one third restricting portion 23C that restricts the movement of the energy storage element 10 adjacent to the third main body portion 21C relative to the third main body portion 21C (see Figure 4). These two end adjacent members 2C form at least one flow path R through which a temperature-regulating fluid can flow between adjacent energy storage elements 10.

[0053] The third main body portion 21C is a portion that faces the long wall portion 123 of the energy storage element 10, while partially contacting the said long wall portion 123. Similar to the first main body portion 21A of the first adjacent member 2A and the second main body portion 21B of the second adjacent member 2B, this third main body portion 21C works together with the adjacent energy storage element 10 to form a flow path R through which a temperature-regulating fluid can flow between it and the energy storage element 10. In this embodiment, the third main body portion 21C is a rectangular plate shape that is the same size as or approximately the same size as the energy storage element 10 when viewed from the X-axis direction. This third main body portion 21C has a plurality of protrusions 211C that each extend in the Y-axis direction and are spaced apart in the Z-axis direction. These plurality of protrusions 211C protrude from the surface 212C of the third main body portion 21C that faces the energy storage element 10.

[0054] The third restricting portion 23C extends in the X-axis direction from at least one corner of the rectangular third main body portion 21C and restricts the relative movement of the energy storage element 10 (specifically the case 11) adjacent to the third main body portion 21C in the Y-Z plane direction by contacting it from the outside in the Y-Z plane direction. In this embodiment, the third restricting portion 23C extends from the third main body portion 21C toward the energy storage element 10 in the X-axis direction.

[0055] Returning to Figures 1 to 4, the holding part 3 holds the laminate D by surrounding it. That is, the holding part 3 holds the multiple energy storage elements 10 and the multiple adjacent members 2 together by surrounding them. The holding part 3 is made of metal or resin, etc.

[0056] Specifically, the holding portion 3 comprises a pair of end portions 31 arranged on both sides of the laminate D in the X-axis direction, an extension portion 32 extending in the X-axis direction along the laminate D at a position aligned with the laminate D in the Y-axis direction, and a connecting portion 33 connecting the end portions 31 and the extension portion 32. The holding portion 3 of this embodiment comprises a pair of extension portions 32 arranged at intervals in the Y-axis direction such that the laminate D is positioned between them.

[0057] The pair of end portions 31 are positioned so as to sandwich an adjacent end member 2C between them and the energy storage element 10 located at the end in the X-axis direction. Specifically, the pair of end portions 31 have an end portion body 311 that extends along the Y-Z plane and a flange portion 313 that extends from the end portion body 311 away from the energy storage element 10 in the X-axis direction (see Figure 4).

[0058] The terminal body 311 is rectangular in shape, and is the same size as or approximately the same size as the energy storage element 10 when viewed from the X-axis direction. More specifically, the terminal body 311 is rectangular in shape with an elongated length in the Y-axis direction, and has a plurality of through holes 312 at both ends in the Y-axis direction, spaced apart in the Z-axis direction. The flange portion 313 extends from one end of the terminal body 311 in the Z-axis direction in the X-axis direction and also extends in the Y-axis direction.

[0059] Each pair of extension portions 32 includes an extension portion body 320 facing the short wall portion 124 of each energy storage element 10, a first piece portion 321 extending in the Y-axis direction along the cover plate 13 of each energy storage element 10 and in the X-axis direction from one end of the extension portion body 320 in the Z-axis direction, a second piece portion 322 extending in the Y-axis direction along the closing portion 121 of each energy storage element 10 and in the X-axis direction from the other end of the extension portion body 320 in the Z-axis direction, and a pair of third pieces portion 323 extending in the Y-axis direction along the terminal portion 31 and in the Z-axis direction from each end of the extension portion body 320 in the X-axis direction (see Figure 4).

[0060] The extension body 320 is a plate-shaped portion that extends along the short wall portion 124 of each energy storage element 10, and has a plurality of vents 3201 that penetrate in the Y-axis direction so that a temperature-regulating fluid can flow into or out of each flow path R, and a plurality of first fixing holes 3202 that penetrate in the Y-axis direction at positions that overlap with each second fixing portion 24B of the second adjacent member 2B when viewed from the Y-axis direction. The first fixing portion 4 is inserted into these first fixing holes 3202.

[0061] The first piece 321 is a long, strip-shaped portion in the X-axis direction, and the second piece 322 is also a long, strip-shaped portion in the X-axis direction. The width of the second piece 322 excluding both ends in the X-axis direction (dimension in the Y-axis direction) is greater than the width of the first piece 321. In addition, each of the pair of third pieces 323 has a plurality of second fixing holes 3231 that are spaced apart in the Z-axis direction. Each second fixing hole 3231 is positioned to overlap with the through hole 312 of the end portion 31 when viewed from the X-axis direction.

[0062] The connecting portion 33 connects the end portion 31 and the extension portion 32 by passing through the through hole 312 of the end portion 31 and the second fixing hole 3231 of the extension portion 32 (more specifically, the third piece portion 323). In this embodiment, each connecting portion 33 is composed of a bolt 331 and a nut 332.

[0063] The insulator 5 is insulating. This insulator 5 is placed between the extended portion 32 and the laminated body D. Specifically, the energy storage device 1 includes a pair of insulators 5, and each insulator 5 covers the area of ​​the extended portion 32 that faces at least a plurality of energy storage elements 10. As a result, the insulator 5 electrically insulates the extended portion 32 from the plurality of energy storage elements 10. The insulator 5 has ventilation areas 51 that are the same size and shape as (or approximately the same as) each ventilation opening 3201 of the extended portion body 320 at positions facing each ventilation opening 3201 of the extended portion body 320 (see Figure 4).

[0064] The seal portion 7 is positioned between the main body A of the device and the elongated member 6, and is a part or component that suppresses gas leakage from between the main body A of the device and the elongated member 6. This seal portion 7 has at least one seal portion communication hole 71 that connects the gas discharge valve 132 and the guide space S within the elongated member 6 (see Figure 2). The seal portion 7 extends in the X-axis direction at one end of the main body A of the device in the Z-axis direction, at a position facing the gas discharge valve 132 in the Y-axis direction. In this embodiment, the seal portion 7 is formed of a foamed material such as a fluorine-based, silicone-based, or urethane-based resin, and seals the space between the main body A of the device and the elongated member 6.

[0065] Specifically, the seal portion 7 is a strip-shaped member with the Y-axis direction as the width direction and the X-axis direction as the length direction, and is provided with seal portion communication holes 71 at positions facing the gas discharge valve 132 of each energy storage element 10 (in other words, positions that overlap with each gas discharge valve 132 when viewed from the Z-axis direction). That is, the seal portion 7 has a plurality of seal portion communication holes 71, and these plurality of seal portion communication holes 71 are arranged in a line with spacing in the X-axis direction on the seal portion 7.

[0066] In this embodiment, the width of the seal portion 7 (dimension in the Y-axis direction) is the same as or approximately the same as the width of the elongated member 6. Furthermore, the seal portion communication hole 71 has a shape and size corresponding to the gas discharge valve 132, and in this embodiment, the seal portion communication hole 71 is a circular hole having the same or approximately the same diameter as the gas discharge valve 132. It is preferable that the shape of the seal portion communication hole 71 and the shape of the gas discharge valve 132, as viewed from the Z-axis direction, are similar, and more preferably the same.

[0067] The elongated member 6 engages with the laminate D (see Figure 3). This elongated member 6 is positioned along the X-axis direction, facing the gas discharge valve 132 in the Z-axis direction, and extends along each energy storage element 10 from one end of the energy storage element 10 to the other end of the energy storage element 10 in the X-axis direction. In this embodiment, the elongated member 6 is a duct that guides fluids such as gas and electrolyte released from the gas discharge valve 132 of the energy storage element 10 in the X-axis direction.

[0068] Specifically, as shown in Figures 7 and 8, the elongated member 6 has an elongated member body 60 that extends in the X-axis direction and guides the fluid discharged from the gas discharge valve 132 of the energy storage element 10 in the X-axis direction, and a joint portion 66 that extends from the end portion 60a of the elongated member body 60 in the X-axis direction. The elongated member 6 also has a plurality of engaging portions 65 that engage with the engaged pieces 22A and 22B of the intermediate adjacent members 2A and 2B (more specifically, the engaged portions 222A and 222B of the engaged pieces 22A and 22B) (see Figure 9). The elongated member 6 in this embodiment is made of a resin such as polybutylene terephthalate or glass fiber compounded resin (polybutylene terephthalate-glass fiber).

[0069] The elongated member body 60 is a hollow cylindrical portion that extends in the X-axis direction and has a guide space S inside. In this embodiment, the elongated member body 60 extends from one end (left side in Figure 3) to the other end (right side in Figure 3) of the device body A in the X-axis direction, with one end (opposite the joint portion 66) closed. When viewed from the Z-axis direction, this elongated member body 60 is positioned to overlap with the gas discharge valve 132 of each energy storage element 10.

[0070] Specifically, the elongated member body 60 has a bottom wall portion 61 facing the device body A (multiple energy storage elements 10), a pair of side wall portions 62 extending from both ends of the bottom wall portion 61 in the Y-axis direction to one side in the Z-axis direction, and a top wall portion 63 connecting the ends of the pair of side wall portions 62 in the Z-axis direction. The space enclosed by the bottom wall portion 61, the pair of side wall portions 62, and the top wall portion 63 constitutes a guide space S that can guide the fluid discharged from the gas discharge valve 132 to the joint portion 66.

[0071] The bottom wall portion 61 is a strip-shaped portion with the Y-axis direction as the width direction and the X-axis direction as the length direction. This bottom wall portion 61 is the portion of the elongated member body 60 that sandwiches the seal portion 7 between itself and the device body A (laminated body D). The bottom wall portion 61 is provided with bottom wall communication holes 611 that connect the seal portion communication holes 71 and the guide space S at positions facing each seal portion communication hole 71 of the seal portion 7 (in other words, positions facing the gas discharge valve 132 of each energy storage element 10). That is, the bottom wall portion 61 is provided with a plurality of bottom wall communication holes 611, and these plurality of bottom wall communication holes 611 are arranged in a line with spacing in the X-axis direction on the bottom wall portion 61.

[0072] The side wall portion 62 is a band-shaped portion that extends in the X-Z plane direction. More specifically, the side wall portion 62 is a band-shaped portion with the Z axis direction as the width direction and the X axis direction as the length direction. The outer surface 62a of this side wall portion 62 constitutes the end face in the Y axis direction of the elongated member 6, and is the surface where the first engaged piece 22A of the first adjacent member 2A and the second engaged piece 22B of the second adjacent member 2B make surface contact.

[0073] The engaging portion 65 is the part where the engaged pieces 22A and 22B of each intermediate adjacent member 2A and 2B engage (in this embodiment, catch) in order to fix the elongated member 6 to the intermediate adjacent members 2A and 2B (i.e., the main body A of the device). This engaging portion 65 protrudes outward in the Y-axis direction from the side wall portion 62.

[0074] The engaging portion 65 of this embodiment comprises a first engaging portion 65A located at one end of the elongated member 6 in the Y-axis direction, and a second engaging portion 65B located at the other end (see Figure 8).

[0075] The first engaging portion 65A is arranged at intervals in the X-axis direction on one side wall portion 62 in the Y-axis direction of the elongated member 6. More specifically, the multiple first engaging portions 65A are arranged in the X-axis direction at the same or approximately the same position as the bottom wall communication hole 611 of the bottom wall portion 61.

[0076] The second engaging portion 65B is arranged at intervals in the X-axis direction on the other side wall portion 62 of the elongated member 6 in the Y-axis direction. More specifically, the multiple second engaging portions 65B are arranged in the X-axis direction at the same or approximately the same position as the bottom wall communication hole 611 of the bottom wall portion 61.

[0077] The joint portion 66 is connected to other members and allows fluid guided to the end portion 60a of the elongated member body 60 to be discharged to the other members. In this embodiment, the joint portion 66 is cylindrical and connects the guide space S to the external space.

[0078] When the elongated member 6, configured as described above, is attached to the device body A (laminated body D) with the sealing portion 7 sandwiched between it and the device body A, as shown in Figure 9, the engaged pieces 221A and 221B of each intermediate adjacent member 2A and 2B are positioned between adjacent engaging portions 65A and 65B spaced apart in the X-axis direction, and the engaged portions 222A and 222B extending from the engaged pieces 221A and 221B abut (engage) with the engaged portions 65A and 65B adjacent to the engaged pieces 221A and 221B in the X-axis direction from one side in the Z-axis direction. As a result, the elongated member 6 is fixed to the device body A (each adjacent member 2A and 2B).

[0079] In addition, in the energy storage device 1 of this embodiment, the engaged portions 222A and 222B that engage with the first engaging portion 65A may be referred to as the first engaged portions 222AA and 222BA, and the engaged portions 222A and 222B that engage with the second engaging portion 65B may be referred to as the second engaged portions 222AB and 222BB (see Figures 5, 6, 8, and 9).

[0080] Returning to Figures 1 and 2, the cover portion C includes a busbar arrangement member 8 on which a busbar B that electrically connects the first energy storage element 10A and the second energy storage element 10B is arranged, and is positioned to overlap with at least one of the energy storage element 10 and the adjacent member 2 on one side in the Z-axis direction. This cover portion C is a member arranged on the device body A to house the busbar B that electrically connects the energy storage elements 10 together. In this embodiment, the cover portion C is a resin member and is superimposed on the device body A, which has the elongated member 6 attached, from one side in the Z-axis direction.

[0081] Specifically, the cover portion C comprises a plurality of busbars B, a busbar arrangement member 8 that houses (covers) the plurality of busbars B, and a harness 9 having a plurality of electric wires connected to the busbars B. In Figure 2, for the purpose of explaining the configuration, some of the busbars B among the plurality of busbars B arranged inside the busbar arrangement member 8 are shown outside the busbar arrangement member 8.

[0082] Each of the multiple busbars B is a conductive plate-shaped member such as metal, and electrically connects the terminals 14 of different energy storage elements 10. In the energy storage device 1 of this embodiment, each busbar B electrically connects the terminals 14 of adjacent energy storage elements 10 with different polarities, thereby connecting multiple energy storage elements 10 in series. In this embodiment, the busbars B are welded to the terminals 14.

[0083] The harness 9 comprises a cable section 91 having multiple wires and a connector 92 positioned at the end of the cable section 91. The other end of each wire in the cable section 91 is connected to a busbar B, etc., and one end of each wire is connected to the connector 92.

[0084] The cable section 91 is formed by bundling together at least a portion of multiple electric wires, the other end of which is connected to a busbar B or the like. The cable section 91 is positioned on the busbar positioning member 8 with one end protruding from the busbar positioning member 8 in the X-axis direction. A connector 92 is attached to the tip of the cable section 91 in the protruding direction. In this embodiment, the connector 92 is a multi-core connector, and two of them are provided.

[0085] The busbar arrangement member 8 comprises two main body portions 81 positioned on one side and the other side of the elongated member 6 in the Y-axis direction, and at least one connecting portion 88 connecting the two main body portions 81. The busbar arrangement member 8 in this embodiment comprises a plurality of connecting portions 88, and these plurality of connecting portions 88 are arranged at intervals in the X-axis direction within the busbar arrangement member 8.

[0086] This busbar arrangement member 8 is made of an electrically insulating material such as resin. In this embodiment, the busbar arrangement member 8 is rectangular in shape, and is the same size as or approximately the same size as the main body A of the device when viewed from the Z-axis direction.

[0087] The main body 81 includes a busbar housing section 82 for housing each busbar B connected to the terminals 14 of the energy storage element 10, a wire arrangement section 83 on which the harness 9 is arranged, and a plurality of cover sections 84. As shown in Figures 10 to 12, the main body 81 of this embodiment includes a first strip-shaped section 85 extending from the wire arrangement section 83 and a second strip-shaped section 86 extending from the tip of the first strip-shaped section 85.

[0088] The two busbar housing sections 82 are spaced apart in the Y-axis direction so that the elongated member 6 is positioned between them (see Figure 1). Each busbar housing section 82 accommodates multiple busbars B, with at least one (two in this embodiment) busbar B surrounded by a wall.

[0089] Specifically, the busbar housing 82 is a plate-shaped portion that covers the surface of the device body A where the terminals 14 are lined up. This busbar housing 82 is a plate-shaped portion whose dimensions in the Z-axis direction are smaller than those in the X-axis and Y-axis directions, and it is a rectangular shape that is elongated in the X-axis direction when viewed from the Z-axis direction. This rectangular busbar housing 82, when viewed from the Z-axis direction, extends from one end to the other end of the device body A in the X-axis direction.

[0090] The wire arrangement section 83 is a groove-shaped portion extending in the X-axis direction, and is arranged along the end of the busbar housing section 82 that is close to the long member 6.

[0091] The cover portion 84 is a part that can be opened and closed to close the opening at one end of the wall surrounding the busbar B in the Z-axis direction within the busbar housing portion 82. The cover portion 84 is rectangular in shape, and a part of its periphery is connected to a part of the wall surrounding the busbar B.

[0092] The first strip-shaped portion 85 is a strip-shaped portion that extends in the direction from the wire arrangement portion 83 toward the elongated member 6 in the Y-axis direction in a cross-section in the Y-Z plane, and is elongated in the X-axis direction when viewed from the Z-axis direction.

[0093] The second strip-shaped portion 86 is a strip-shaped portion that extends from the tip of the first strip-shaped portion 85 toward the laminated body D in the Z-axis direction in a cross-section in the Y-Z plane direction, and is elongated in the X-axis direction when viewed from the Y-axis direction.

[0094] The connecting portion 88 has a viewing portion 885 that allows the engagement portion 65 of the long member 6 with the laminate D (in this embodiment, the first engagement portion 65A and the second engagement portion 65B) to be seen from the opposite side of the laminate D in the Z-axis direction (see Figure 13).

[0095] Specifically, the connecting portion 88 comprises a pair of first portions 881 extending in the Z-axis direction from the first band-shaped portion 85 of the main body portion 81, and a second portion 882 connecting the tips of the first portions 881.

[0096] The first portion 881 extends from the Y-axis end of the first strip-shaped portion 85 in a direction away from the laminate D in the Z-axis direction. The dimension (width) of the first portion 881 in the X-axis direction is constant.

[0097] The second portion 882 extends in the Y-axis direction from the tip of one first portion 881 to the tip of the other first portion 881. The dimension (width) of the second portion 882 in the X-axis direction is constant and is the same as the width of the first portion 881.

[0098] The second portion 882 has a recess 8821 on the surface 882a furthest from the laminate D in the Z-axis direction, which is recessed toward the laminate D in the Z-axis direction. This recess 8821 is a rectangular recess when viewed from the Z-axis direction. By providing the recess 8821 in the connecting portion 88, the connecting portion 88 can be made lighter or its strength improved.

[0099] The boundary portion 883 between the first portion 881 and the second portion 882 is curved when viewed from the X-axis direction and has a hole 885 that penetrates in the Z-axis direction. In this embodiment, the connecting portion 88 has holes 885 in each boundary portion 883, and each of these holes 885 constitutes a viewing portion. That is, the connecting portion 88 has two viewing portions 885. Each of these holes 885 is positioned to overlap with the Y-axis end of the elongated member 6 when viewed from the Z-axis direction (see Figure 13).

[0100] In the energy storage device 1 configured as described above, during assembly, the long member 6 is attached to the device body A, and then the cover part C is attached to the device body A.

[0101] Specifically, first, the elongated member 6 is pushed between the pairs of engaging pieces of each intermediate adjacent member of the device body A (i.e., between the pair of first engaging pieces 22A of the first adjacent member 2A, and between the pair of second engaging pieces 22B of the second adjacent member 2B). At this time, the pairs of engaging pieces 22A and 22B of each intermediate adjacent member 2A and 2B are pushed apart by the elongated member 6 in a direction that increases the distance between their ends in the Y-axis direction, causing them to bend (elastically deform). When the elongated member 6 is pushed to its position, the engaging pieces 22A and 22B return to their original state from the bent state, and the engaging portions 222A and 222B of the engaging pieces 22A and 22B are caught on the engaging portion 65 of the elongated member 6 (in contact from one side in the Z-axis direction) (see Figure 9). As a result, the elongated member 6 is fixed to each intermediate adjacent member 2A and 2B. In other words, the elongated member 6 is fixed to the device body A (laminated body D).

[0102] Next, the long member 6, which is fixed to each intermediate adjacent member 2A, 2B of the main body A of the device (i.e., attached to the main body A of the device), is superimposed on the main body A of the device A with the cover portion C aligned with the main body A so that it fits into the space formed between the two main body portions 81 from the other side in the Z-axis direction. Specifically, the cover portion C (more precisely, the busbar arrangement member 8) is superimposed on the main body A of the device A with the other side in the Z-axis direction.

[0103] In this way, when the cover part C is superimposed (attached) to the device body A with the long member 6 attached, the long member 6 is fitted between the two main body parts 81.

[0104] When the elongated member 6 is fitted between the two main body portions 81, at the position of the connection portion 88 of the busbar arrangement member 8, when viewed from the Z-axis direction, the engaging portion 65 of the elongated member 6 and the pair of engaged pieces 22A and 22B of the intermediate adjacent members 2A and 2B are in a state of overlap with the connection portion 88. However, since the connection portion 88 is equipped with a viewing portion 885, it is possible to visually confirm through the viewing portion 885 whether or not the engaging portion 65 of the elongated member 6 and the engaged pieces 22A and 22B of the adjacent members 2A and 2B are engaged (see Figure 13).

[0105] That is, the energy storage device 1 of this embodiment includes a laminate D containing a first energy storage element 10A and a second energy storage element 10B arranged in the X-axis direction (first direction), a long member 6 extending in the X-axis direction and superimposed on the laminate D in the Z-axis direction (second direction perpendicular to the first direction), and a busbar arrangement member 8 on which a busbar B connecting the first energy storage element 10A and the second energy storage element 10B is arranged. The busbar arrangement member 8 includes two main body parts 81 arranged on one side and the other side of the long member 6 in the Y-axis direction (third direction perpendicular to the first and second directions, respectively), and a connecting part 88 connecting the two main body parts 81. The long member 6 engages with the laminate D, and the engagement part 65 of the long member 6 with the laminate D is located between the laminate D and the connecting part 88. The connecting part 88 includes a viewing part 885 that allows the engagement part 65 to be seen from the opposite side of the laminate D in the Z-axis direction.

[0106] With this energy storage device 1, even if the engagement portion 65 of the long member 6 with the laminated body D is located between the laminated body D and the busbar arrangement member 8 (connection portion 88), the engagement portion 65 of the long member 6 with the device body A (laminated body D) can be visually inspected (i.e., the engagement state can be confirmed) through the viewing portion 885.

[0107] In the energy storage device 1 of this embodiment, the elongated member 6 is a duct that guides the fluid (gas, etc.) released from the first energy storage element 10A or the second energy storage element 10B in the X-axis direction (first direction).

[0108] With this configuration, when a fluid such as gas is released from the first energy storage element 10A or the second energy storage element 10B, the fluid can be guided to a predetermined position.

[0109] In the energy storage device of this embodiment, the laminated body D includes adjacent members 2A and 2B positioned between the first energy storage element 10A and the second energy storage element 10B. The adjacent members 2A and 2B have engaged portions 222A and 222B at the ends closest to the elongated member (duct portion) 6, and the engaged portion 65 of the elongated member 6 engages with the engaged portions 222A and 222B of the adjacent members 2A and 2B.

[0110] With this configuration, since no members other than the adjacent members 2A and 2B are required to engage the long member 6, costs can be reduced.

[0111] In the energy storage device 1 of this embodiment, the engaging portion 65 includes a first engaging portion 65A located at one end of the elongated member (duct portion) 6 in the Y-axis direction (third direction), and a second engaging portion 65B located at the other end. The engaged portions 222A and 222B may include first engaged portions 222AA and 222BA that engage with the first engaging portion 65A, and second engaged portions 222AB and 222BB that engage with the second engaging portion 65B.

[0112] With this configuration, the elongated member 6 can firmly engage with adjacent members 2A and 2B by engaging with them at both ends in the Y-axis direction.

[0113] In the energy storage device 1 of this embodiment, the viewing section 885 is positioned at the connection section 88 at a position corresponding to the first engaging section 65A and a position corresponding to the second engaging section 65B in the Y-axis direction (third direction).

[0114] With this configuration, each engagement point between the elongated member 6 and the adjacent member 2A (the first engagement portion 65A and the first engaged portion 222AA, and the second engagement portion 65B and the second engaged portion 222AB) can be visually inspected (confirmed).

[0115] Furthermore, 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. In addition, a part of the configuration of one embodiment can be deleted.

[0116] In the energy storage device 1 of the above embodiment, the busbar arrangement member 8 is provided with a plurality of connection parts 88, but the configuration is not limited to this. The busbar arrangement member 8 may be configured to have only one connection part 88. In this case, the dimension of the connection part 88 in the X-axis direction may be the same as the dimension of the main body part 81 in the X-axis direction.

[0117] In the connection portion 88 of the busbar arrangement member 8 of the above embodiment, the viewing portion 885 is a hole that penetrates in the Z-axis direction, but the configuration is not limited to this. In the connection portion 88, the viewing portion 885 may be made of a transparent material. That is, the viewing portion 885 may be made of a material that allows the member on the other side to be seen through the viewing portion 885. Alternatively, the entire connection portion 88 may be made of a transparent material.

[0118] In the above embodiment, the elongated member 6 is a duct that guides the fluid discharged from the gas discharge valve 132 of the energy storage element 10 in the X-axis direction, but the configuration is not limited to this. The elongated member 6 may also be wiring, a circuit board, or a member for arranging and housing such wiring or circuit boards.

[0119] In the energy storage device 1 of the above embodiment, the long member 6 is fixed to the laminate D by the engagement of the engagement portion 65 of the long member 6 with the engagement portions 222A and 222B of the intermediate adjacent members 2A and 2B of the laminate D, but the configuration is not limited to this. The long member 6 may also be fixed to the laminate D by the engagement portion 65 of the long member 6 engaging with a member or part other than the intermediate adjacent members 2A and 2B.

[0120] Alternatively, the elongated member 6 may be fixed to the laminated body D by the engagement portion 65 of the elongated member 6 and the engaged portions 222A and 222B of the intermediate adjacent members 2A and 2B engaging with each other via other members.

[0121] In the energy storage device 1 of the above embodiment, the long member 6 is fixed to the laminate D by the engagement of the first engaging portion 65A with the first engaged portions 222AA and 222BA, and the engagement of the second engaging portion 65B with the second engaged portions 222AB and 222BB. That is, the long member 6 is engaged with the laminate D (specifically, the intermediate adjacent members 2A and 2B) at both ends in the Y-axis direction, but the configuration is not limited to this. The long member 6 and the laminate D may be configured such that one end of the long member 6 in the Y-axis direction engages with the laminate D at the position of the connection portion 88 in the X-axis direction.

[0122] In the above embodiment, the connection portion 885 is positioned at a location corresponding to the first engagement portion 65A and a location corresponding to the second engagement portion 65B in the Y-axis direction, but the configuration is not limited to this. The connection portion 885 may be positioned only at a location corresponding to either the first engagement portion 65A or the second engagement portion 65B in the Y-axis direction. Even in this case, the engagement state of one of the two engagement portions 65A and 65B with the laminate D in the elongated member 6 can be visually confirmed.

[0123] In the energy storage device 1 of the above embodiment, the engagement points between the second adjacent member 2B and the long member (duct portion) 6 (first engagement portion 65A and first engaged portion 222BA, and second engagement portion 65B and second engaged portion 222BB) and the connection portion 88 of the busbar arrangement member 8 do not overlap when viewed from the Z-axis direction, but they may overlap. In this case, the engagement state of the engagement points between the second adjacent member 2B and the long member (duct portion) 6 (first engagement portion 65A and first engaged portion 222BA, and second engagement portion 65B and second engaged portion 222BB) can be visually confirmed through the viewing portion 885.

[0124] In order to express the present invention, the invention has been adequately and sufficiently described above through embodiments with reference to the drawings, but those skilled in the art should recognize that it is easy to modify and / or improve the above embodiments. Accordingly, unless such modifications or improvements implemented by those skilled in the art deviate from the scope of the claims described in the claims, such modifications or improvements shall be interpreted as being included within the scope of the claims.

[0125] DESCRIPTION OF SYMBOLS 1... Power storage device, 2... Adjacent member, 2A... First adjacent member (middle adjacent member), 21A... First body part, 22A... First engaged piece, 221A... Engaged piece main body, 222A... Engaged part, 222AA... First engaged part, 222AB... Second engaged part, 23A... Third 1 regulating part, 2B...second adjacent member (intermediate adjacent member), 21B...second main body part, 211B...convex strip, 212B...opposed surface, 22B...second engaged piece, 221B...engaged piece main body, 222B...engaged part, 222BA...first engaged part, 222BB...second engaged part Part, 23B...Second restricting part, 24B...Second fixing part, 2C...End adjacent member, 21C...Third main body part, 211C...Protrusion, 212C...Opposite surface, 23C...Third restricting part, 3...Holding part, 31...End part, 311...End part body, 312...Through hole, 313...Flange part, 32...Extended part, 320...Extended part body, 3201...Ventilation opening, 3202...First fixing hole, 321...First piece part, 322...Second piece part, 323...Third piece part, 3231...Second fixing hole, 33...Connecting part, 331...Bolt, 332...Nut, 4...First fixing part, 5...Insulator, 51...Ventilation area, 6...Long member, 60...Long member body, 60a...End, 61...Bottom wall, 611...Bottom wall communication hole, 62...Side wall, 62a...Outer surface, 63...Top wall, 65...Engaging part, 65A...First engaging part, 65B...Second engaging part, 66...Joint part, 7...Seal part, 71...Seal part communication hole, 8...Busbar arrangement member, 81...Main body, 82...Busbar housing part, 83...Wire arrangement part, 84...Lid, 85...First strip-shaped part, 86...Second strip-shaped part, 88...Connection part, 881...First part 882...Second part, 882a...Surface, 8821...Recess, 883...Boundary, 885...Visibility part (hole), 9...Harness, 91...Cable part, 92...Connector, 10...Energy storage element, 10A...First energy storage element, 10B...Second energy storage element, 11...Case, 12...Case body, 121...Closing part, 122...Body part, 123...Long wall part, 124...Short wall part, 13...Lid plate, 131...Lid plate body, 132...Gas discharge valve, 14...Terminal, A...Device body, B...Bus bar, C...Cover part, D...Laminate, R...Flow path, S...Guidance space

Claims

1. An energy storage device comprising: a laminate including a first energy storage element and a second energy storage element arranged in a first direction; a long member extending in the first direction and superimposed on the laminate in a second direction perpendicular to the first direction; and a busbar arrangement member on which a busbar connecting the first energy storage element and the second energy storage element is arranged, wherein the busbar arrangement member comprises two main body portions arranged on one side and the other side of the long member in a third direction perpendicular to the first direction and the second direction, respectively, and a connecting portion connecting the two main body portions, wherein the long member engages with the laminate, the engaging portion of the long member with the laminate is located between the laminate and the connecting portion, and the connecting portion has a viewing portion that allows the engaging portion to be seen from the opposite side of the laminate in the second direction.

2. The energy storage device according to claim 1, wherein the elongated member is a duct portion that guides the fluid discharged from the first energy storage element or the second energy storage element in the first direction.

3. The energy storage device according to claim 2, wherein the laminate comprises an adjacent member disposed between the first energy storage element and the second energy storage element, the adjacent member has an engaging portion at the end closest to the duct portion, and the engaging portion of the duct portion engages with the engaging portion of the adjacent member.

4. The energy storage device according to claim 3, wherein the engaging portion comprises a first engaging portion disposed at one end of the duct portion in the third direction and a second engaging portion disposed at the other end, and the engaged portion comprises a first engaged portion that engages with the first engaging portion and a second engaged portion that engages with the second engaging portion.

5. The energy storage device according to claim 4, wherein the viewing portion is positioned at the connection portion at a position corresponding to the first engaging portion in the third direction and at a position corresponding to the second engaging portion.

Images