Power storage device

Abstract

A power storage device according to this embodiment is characterized by comprising: a layered body that includes a first power storage element and a second power storage element arranged in a first direction; a bus bar that conects the first power storage element and the second power storage element; a first member that is positioned in a second direction intersecting the first direction of the layered body and retains the bus bar; and a pressing part that presses the first member toward the layered body.

Description

Power storage device

[0001] The present invention relates to a power storage device including a plurality of power storage elements. This application claims priority based on Japanese Patent Application No. 2024-179791 filed on October 15, 2024, and incorporates its content herein by reference.

[0002] Patent Document 1 discloses a power supply device including a cell stack assembly in which a plurality of batteries are arranged and a bus bar plate having a bus bar at an electrode opening.

[0003] Japanese Patent Application Laid-Open No. 2017-10778

[0004] In the above power supply device, with a plurality of batteries housed in a lower case, the bus bar plate is fixed to the upper case and the lower case to form a cell stack assembly.

[0005] When arranging a first member for holding a bus bar on a laminate including a plurality of power storage elements, there are cases where the first member cannot be stably arranged on the laminate due to manufacturing errors or the like of each component.

[0006] An embodiment of the present invention provides a power storage device in which a first member is stably arranged with respect to a laminate.

[0007] The power storage device of this embodiment includes: a laminate including a first power storage element and a second power storage element arranged in a first direction; a bus bar connecting the first power storage element and the second power storage element; a first member arranged in a second direction intersecting the first direction of the laminate and holding the bus bar; a pressing portion that presses the first member toward the laminate.

[0008] According to an embodiment of the present invention, a power storage device in which a first member is stably arranged with respect to a laminate can be provided.

[0009] 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 an exploded perspective view of the laminated body of the energy storage device. Figure 4 is an exploded perspective view of the restraint portion of the energy storage device. Figure 5 is a perspective view of the busbar of the energy storage device. Figure 6 is a partially enlarged view of the busbar module of the energy storage device as seen from the Z-axis direction. Figure 7 is a cross-sectional view of the position VII-VII in Figure 6. Figure 8 is an enlarged perspective view of the busbar arrangement portion and its surroundings of the busbar module. Figure 9 is a cross-sectional view of the position IX-IX in Figure 6, where the busbar is in the second position. Figure 10 is a cross-sectional view of the position IX-IX in Figure 6, where the busbar is in the first position. Figure 11 is a cross-sectional view of the position XI-XI in Figure 6, where the busbar is in the second position. Figure 12 is a cross-sectional view of the position XI-XI in Figure 6, where the busbar is in the first position.

[0010] (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; a busbar connecting the first energy storage element and the second energy storage element; a first member arranged in a second direction intersecting the first direction of the laminate and holding the busbar; and a pressing portion that presses the first member toward the laminate.

[0011] According to the energy storage device of one embodiment of the present invention, even if there is a variation in the position of the first energy storage element and the second energy storage element of the laminate in the second direction (the stacking direction between the laminate and the first member), the first member is pressed against the laminate by the pressing part, so the first member can be stably positioned relative to the laminate.

[0012] (2) In the energy storage device described in (1) above, the first member may include the pressing portion.

[0013] According to the energy storage device described in (2) above, by using a part (pressing part) of the first member that holds the busbar to press the first member against the laminate, the first member can be stably positioned relative to the laminate with a simple configuration.

[0014] (3) In the energy storage device described in (1) or (2) above, the pressing portion may be elastically deformable and positioned between the busbar and the laminate, and the first member may be pressed against the laminate by the elastic force on the busbar.

[0015] According to the energy storage device described in (3) above, the first member can be pressed against the laminate by utilizing the elastic force generated between the pressing part and the busbar due to the elastic deformation of the pressing part.

[0016] (4) In the energy storage device described in any of (1) to (3) above, the first member may include a restricting part that restricts the movement of the busbar.

[0017] According to the energy storage device described in (4) above, the movement of the busbar is restricted by the restricting part until the busbar is connected to the terminal. This makes the assembly of the energy storage device easier.

[0018] (5) In the energy storage device described in (4) above, the restricting unit may release the restriction when the busbar approaches the laminate.

[0019] According to the energy storage device described in (5) above, the restriction on the busbar by the restricting part is released by bringing the busbar closer to the laminate, making it easier to release the restriction during assembly work of the energy storage device.

[0020] Hereinafter, one embodiment of the present invention will be described with reference to Figures 1 to 12. 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.

[0021] As shown in Figures 1 to 3, the energy storage device 1 according to this embodiment includes a laminate 2 containing two energy storage elements 10 (first energy storage element 10A and second energy storage element 10B) arranged in a first direction, a busbar 6 connecting these two energy storage elements 10, a first member 7 arranged in a second direction intersecting the first direction of the laminate 2 and holding the busbar 6, and a pressing portion 75 (see Figure 8) that presses the first member 7 toward the laminate 2. The first member 7 in this embodiment includes the pressing portion 75. The energy storage device 1 will now be described in detail.

[0022] The energy storage device 1 comprises a laminate 2 on which energy storage elements 10 are stacked, a restraining part 3 that restrains the laminate 2, and a busbar module 5 that holds the busbar 6.

[0023] The laminate 2 has a plurality of energy storage elements 10 and a plurality of separators 20. In this laminate 2, the energy storage elements 10 and separators 20 are arranged alternately in the stacking direction.

[0024] Each of the multiple energy storage elements 10 is a primary battery, a secondary battery, a capacitor, etc. The energy storage element 10 in this embodiment is a non-aqueous electrolyte secondary battery that can be charged and discharged. More specifically, the energy storage element 10 is a lithium-ion secondary battery that utilizes electron transfer that occurs with the movement of lithium ions.

[0025] Specifically, each energy storage element 10 comprises an electrode body, a case 11 that houses the electrode body together with an electrolyte, terminals 14 (positive electrode terminal 14a, negative electrode terminal 14b) with at least a portion exposed to the outside of the case 11, and a current collector that electrically connects (makes conductive) the electrode body and the terminals 14.

[0026] In the electrode body, positive and negative electrodes are alternately stacked with a separator 20 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.

[0027] The case 11 has a case body 12 having an opening and a plate-shaped cover portion 13 that closes (closes) the opening of the case body 12. In this embodiment, the case body 12 is a bottomed rectangular tube, and the case 11 is a rectangular parallelepiped (hexagonal) shape. In this embodiment, the case 11 is a flat rectangular parallelepiped shape, and the multiple energy storage elements 10 are arranged in a line in the laminate 2 with the wide surfaces (walls) of the case 11 (case body 12) facing each other via a separator 20.

[0028] In the following explanation, the stacking direction of the multiple energy storage elements 10 (first direction) is defined as the X-axis direction in the Cartesian coordinate system, the normal direction of the cover portion 13 (second direction) is defined as the Z-axis direction in the Cartesian coordinate system, and the directions perpendicular to the X-axis direction and the Z-axis direction are defined as the Y-axis direction in the Cartesian coordinate system.

[0029] Each of the multiple separators 20 has electrical insulation properties and is placed 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, a part of the restraining portion 3 (end member) 31: see Figure 2). This electrically insulates adjacent energy storage elements 10 and between the energy storage elements 10 and the end member 31. Each separator 20 has a shape that corresponds to the energy storage element 10 (case 11) when viewed from the X-axis direction (in this embodiment, a rectangular shape that is elongated in the Y-axis direction).

[0030] The restraining portion 3 surrounds the laminate 2, thereby restraining the laminate 2 in a compressed state in the X-axis direction. Specifically, as shown in Figure 4, the restraining portion 3 includes a pair of end members 31 arranged on both sides of the laminate 2 (a plurality of energy storage elements 10 arranged in the X-axis direction), a pair of side members 32 connecting the pair of end members 31, and a plurality of connecting members 33 connecting the end members 31 and the side members 32.

[0031] Each of the pair of end members 31 is a plate-shaped member positioned in the laminate 2 to sandwich a separator 20 between itself and the energy storage element 10, which is located at the X-axis end (outermost part). The end members 31 are rectangular in shape, corresponding in size to the energy storage element 10 (case 11) when viewed from the X-axis direction. Specifically, the end members 31 are rectangular in shape, elongated in the Y-axis direction. The end members 31 have connecting recesses 311 at both ends in the Y-axis direction that are recessed inward in the Y-axis direction and extend in the Z-axis direction. The end members 31 have a plurality of first connecting holes 312 at both ends in the Y-axis direction, spaced apart in the Z-axis direction.

[0032] The pair of side members 32 are positioned on both sides of the laminate 2 in the Y-axis direction and extend in the X-axis direction along the laminate 2. The side members 32 are rectangular in shape and are the same size as the laminate 2 when viewed from the Y-axis direction. Specifically, the side member 32 has a rectangular side member body 321 that is elongated in the X-axis direction, and a pair of connecting protrusions 322 that extend from both ends of the side member body 321 in the X-axis direction toward the inside in the Y-axis direction (towards the center of the laminate 2 in the Y-axis direction).

[0033] Each of the pair of connecting protrusions 322 fits into the corresponding connecting recess 311 of the end member 31. The connecting protrusions 322 have a plurality of second connecting holes 323 that are spaced apart in the Z-axis direction. Each second connecting hole 323 overlaps with the corresponding first connecting hole 312 of the end member 31 when viewed from the X-axis direction.

[0034] Each of the multiple connecting members 33 connects the end member 31 and the side member 32 by being inserted into the first connecting hole 312 of the end member 31 and the second connecting hole 323 of the side member 32 (connecting projection 322).

[0035] The busbar module 5 includes a plurality of busbars 6 and a first member 7 that holds the plurality of busbars 6.

[0036] The busbar 6 is a conductive plate-shaped member made of metal or the like, and connects the terminals 14 of different energy storage elements 10. The busbar 6 makes adjacent energy storage elements 10 electrically conductive by connecting their terminals 14. In the energy storage device 1 of this embodiment, each busbar 6 is joined to the terminal 14 by welding, and multiple busbars 6 connect multiple energy storage elements 10 included in the energy storage device 1 in series (making them electrically conductive).

[0037] The busbar 6 in this embodiment electrically connects (makes conductive) the corresponding terminals 14 of two adjacent energy storage elements 10 in the X-axis direction. Hereinafter, one of the two energy storage elements 10 connected by the busbar 6 will be referred to as the first energy storage element 10A, and the other of the two energy storage elements 10 will be referred to as the second energy storage element 10B. When the positive terminal 14a of the first energy storage element 10A is referred to as the first terminal, the negative terminal (the terminal corresponding to the first terminal) 14b of the second energy storage element 10B will be referred to as the second terminal. Furthermore, when the negative terminal 14b of the first energy storage element 10A is referred to as the first terminal, the positive terminal (the terminal corresponding to the first terminal) 14a of the second energy storage element 10B will be referred to as the second terminal.

[0038] Specifically, the busbar 6 is a conductive, rectangular plate-shaped member when viewed from the Z-axis direction. As shown in Figure 5, the busbar 6 has a first plate-shaped portion 61 and a second plate-shaped portion 62 that are spaced apart in the X-axis direction, and a busbar projection 63 that connects the first plate-shaped portion 61 and the second plate-shaped portion 62.

[0039] The first plate-like portion 61 is a plate-like part that extends in a plane direction orthogonal to the Z-axis direction, and the second plate-like portion 62 is a plate-like part that extends in a plane direction orthogonal to the Z-axis direction at the same position as the first plate-like portion 61 in the Z-axis direction.

[0040] The bus bar convex portion 63 is a part that protrudes in a direction away from the laminated body 2 in the Z-axis direction at the central portion of the bus bar 6 in the X-axis direction, and is a part that absorbs (relieves) stress when the first plate-like portion 61 and the second plate-like portion 62 are displaced relative to each other in the X-axis direction.

[0041] Specifically, the bus bar convex portion 63 includes a first rising portion 631 that rises in the Z-axis direction from an edge of the first plate-like portion 61 close to the second plate-like portion 62, a second rising portion 632 that rises in the Z-axis direction from an edge of the second plate-like portion 62 close to the first plate-like portion 61, and a connecting portion 633 that connects the tip of the first rising portion 631 and the tip of the second rising portion 632. This connecting portion 633 is a plate-like shape that extends in a plane direction orthogonal to the Z-axis direction, that is, a plate-like shape parallel or substantially parallel to the first plate-like portion 61 and the second plate-like portion 62.

[0042] The first member 7 is a member that holds the bus bar 6. The first member 7 covers the plane in which the terminals 14 are arranged in the laminated body 2. The first member 7 of the present embodiment is a plate-like part or member. Specifically, the first member 7 of the present embodiment is a plate-like member whose dimension in the Z-axis direction is smaller than the dimensions in the X-axis direction and the Y-axis direction, and is a rectangular shape with a size corresponding to the laminated body 2 when viewed from the Z-axis direction. The first member 7 of the present embodiment is made of a material having insulation properties such as resin.

[0043] Specifically, the first member 7 includes a plate body 70 having a plurality of bus bar arrangement portions 73 where the bus bar 6 is arranged.

[0044] The plate body 70 has a plate-like first portion 71 that extends in the X-axis direction and a pair of second portions 72 that extend in the X-axis direction on both sides of the first portion 71 in the Y-axis direction.

[0045] The first part 71 has through holes 711 penetrating in the Z-axis direction at respective positions corresponding to each power storage element 10 of the laminate 2 in the X-axis direction. That is, the first part 71 has a plurality of through holes 711. These plurality of through holes 711 are arranged at intervals in the X-axis direction.

[0046] Each second part 72 is formed by arranging (connecting) a plurality of bus bar arrangement parts 73 in the X-axis direction.

[0047] As shown in FIGS. 6 to 8, each bus bar arrangement part 73 has a peripheral wall part 74 surrounding the periphery of the bus bar 6 and a pressing part 75 for pressing the plate body 70 against the laminate 2.

[0048] The peripheral wall part 74 has a cylindrical peripheral wall part main body 741 and a restricting part 76 for restricting the movement of the bus bar 6.

[0049] The peripheral wall part main body 741 is cylindrical along the peripheral edge of the bus bar 6 when viewed from the Z-axis direction. That is, the peripheral wall part main body 741 is a square corner cylindrical shape corresponding to the shape of the bus bar 6 when viewed from the Z-axis direction. The peripheral wall part main body 741 has a restricting part opening 741a at a part where the restricting part 76 is arranged. The peripheral wall part main body 741 of the present embodiment has a plurality (the same number as the number of restricting parts 76) of restricting part openings 741a.

[0050] The plurality of restricting part openings 741a are respectively arranged on a pair of wall parts 742 facing each other in the Y-axis direction in the peripheral wall part main body 741. The positions of the plurality of restricting part openings 741a in the Z-axis direction are the same or substantially the same.

[0051] Also, the bus bar 6 arranged inside the peripheral wall part main body 741 (the region surrounded by the peripheral wall part main body 741) is movable in the Z-axis direction until it is joined to the first terminal 14a and the second terminal 14b. In the bus bar module 5 of the present embodiment, the bus bar 6 is in the first position P1 (see FIGS. 10 and 12), which is the position in the Z-axis direction in a state where it is joined to the first terminal 14a and the second terminal 14b, and in the peripheral wall part main body 741, and the second position P2 (see FIGS. 9 and 11), which is the position in the Z-axis direction away from the first terminal 14a and the second terminal 14b (specifically, the position in contact with or close to the restricting part 76), and is movable between them.

[0052] The restricting portion 76 is located in the peripheral wall body 741, more specifically in the restricting portion opening 741a of the peripheral wall body 741 (see Figure 7). The restricting portion 76 restricts the movement of the busbar 6 away from the first terminal 14a and the second terminal 14b in the Z-axis direction relative to the busbar arrangement portion 73 (more specifically, the peripheral wall body 741). In the first member 7 of this embodiment, multiple (three in this example) restricting portions 76 are located for each peripheral wall portion 74.

[0053] Specifically, the restricting unit 76 restricts the movement of the busbar 6 away from the first terminal 14a and the second terminal 14b by contacting the busbar 6 from the opposite side of the first terminal 14a and the second terminal 14b in the Z-axis direction.

[0054] More specifically, the restricting portion 76 has a strip portion 761 extending in the Z-axis direction within the restricting portion opening 741a, and a restricting projection 762 protruding from the strip portion 761 (see Figures 7 and 8).

[0055] The strip portion 761 is a plate-shaped part that extends from the peripheral edge of the regulating opening 741a in the peripheral wall portion body 741 toward the laminated body 2 in the Z-axis direction.

[0056] The restricting projection 762 has a contact surface 763 that extends from the strip portion 761 in the Y-axis direction and faces the busbar 6, and an inclined surface 764 that extends from the strip portion 761 toward the tip of the contact surface 763.

[0057] The contact surface 763 is a surface that extends in a plane direction perpendicular to the Z-axis direction. When the busbar 6 comes into contact with the contact surface 763, the contact surface 763 restricts the busbar 6 from moving any further away from the laminate 2 in the Z-axis direction.

[0058] The inclined surface 764 is a surface that inclins so that as it approaches the laminate 2 in the Z-axis direction, it is located inward in the Y-axis direction (inward of the peripheral wall body 741). In other words, the inclined surface 764 is an inclined surface that includes the X-axis direction and intersects with the Y-axis direction and the Z-axis direction.

[0059] The pressing portion 75 includes a support portion 751 extending from one wall portion 742A to the other wall portion 742B of a pair of wall portions 742 in the peripheral wall portion body 741, and an elastically deformable portion 752 supported by the support portion 751.

[0060] The support portion 751 extends in the Y-axis direction from one wall portion 742A to the other wall portion 742B at the center of the wall portion 742 in the X-axis direction (a position that overlaps with the busbar protrusion 63 of the busbar 6 when viewed from the Z-axis direction). In the Z-axis direction, this support portion 751 is located between the laminate 2 and the busbar 6 which is joined to the first terminal 14a and the second terminal 14b, and supports the elastically deformable portion 752.

[0061] The elastic deformation portion 752 extends from the support portion 751 and, by elastic force, presses the busbar 6 away from the first terminal 14a and the second terminal 14b in the Z-axis direction, thereby pressing the plate body 70 against the laminate 2 via the support portion 751. In the busbar arrangement portion 73 of this embodiment, a pair of elastic deformation portions 752 extend from the support portion 751, and each elastic deformation portion 752 has an inclined portion 753 that extends from the support portion 751 in a direction inclined with respect to the support portion 751, and a contact portion 754 that extends in the Y-axis direction from the tip of the inclined portion 753.

[0062] The inclined portion 753 extends at an angle to the support portion 751 such that as it approaches the center of the support portion 751 in the Y-axis direction, it moves further away from the laminated body 2 in the Z-axis direction. The elastic force generated by the bending of the inclined portion 753 causes the pressing portion 75 to push the plate body 70 toward the laminated body 2.

[0063] The contact portion 754 is the part that extends from the tip of the inclined portion 753 toward the center of the support portion 751 in the Y-axis direction. The contact portion 754 is in contact with the busbar protrusion 63 of the busbar 6 (more specifically, the connecting portion 633).

[0064] When assembling the energy storage device 1 configured as described above, first, the energy storage elements 10 and separators 20 are arranged alternately to form a laminate 2, and then this formed laminate 2 is restrained by the restraint part 3.

[0065] Furthermore, busbars 6 are positioned in each busbar placement section 73 of the first member 7, forming a busbar module 5. At this time, the busbars 6 positioned in each busbar placement section 73 (more specifically, each peripheral wall section 74) are sandwiched between the pressing section 75 (more specifically, the contact section 754 of the elastic deformation section 752) and each restricting section 76 (more specifically, each restricting projection 762) in the Z-axis direction. For this reason, the busbars 6 are positioned at the second position P2 in the Z-axis direction (see Figures 9 and 11).

[0066] Next, the busbar module 5 is placed on the laminate 2 which is constrained by the restraint portion 3, and the busbars 6 arranged in each busbar arrangement portion 73 are joined (welded in this embodiment) to the first terminal 14a and the second terminal 14b.

[0067] Specifically, at each peripheral wall portion 74, the busbar 6 at the second position P2 is pushed toward the first position P1, causing it to move to the first position P1 (see Figures 10 and 12). At this time, the busbar 6 is guided by the peripheral wall portion 74 to a position where it contacts the first terminal 14a and the second terminal 14b.

[0068] When the bus bar 6 is pressed toward the first terminal 14a and the second terminal 14b to a position where it contacts the first terminal 14a and the second terminal 14b, the contact portion 754 of the elastic deformation portion 752 is pressed, causing the inclined portion 753 to bend and generating an elastic force in the inclined portion 753.

[0069] As described above, the busbars 6 of each busbar arrangement section 73 (each peripheral wall section 74) are joined to the first terminal 14a and the second terminal 14b, respectively, thereby completing the attachment of the busbar module 5 to the laminate 2.

[0070] The energy storage device 1 described above comprises a laminate 2 including a first energy storage element 10A and a second energy storage element 10B arranged in the X-axis direction (first direction), a busbar 6 connecting the first energy storage element 10A and the second energy storage element 10B, a first member 7 arranged in the Z-axis direction of the laminate 2 (second direction intersecting the first direction) and holding the busbar 6, and a pressing part 75 that presses the first member 7 toward the laminate 2.

[0071] With this configuration, even if there is variation in the Z-axis position (the stacking direction between the laminate 2 and the first member 7) between the first energy storage element 10A and the second energy storage element 10B of the laminate 2, the first member 7 is pressed against the laminate 2 by the pressing part 75, so the first member 7 can be stably positioned relative to the laminate 2.

[0072] In the energy storage device 1 of this embodiment, the first member 7 includes a pressing portion 75. By using a part of the first member 7 (the pressing portion 75) that holds the busbar 6 to press the first member 7 against the laminate 2, the first member can be stably positioned relative to the laminate with a simple configuration.

[0073] In the energy storage device 1 of this embodiment, the pressing portion 75 is elastically deformable and positioned between the busbar 6 and the laminate 2, and the elastic force on the busbar 6 presses the first member 7 against the laminate 2. That is, in the energy storage device 1 of this embodiment, the elastic force generated between the pressing portion 75 and the busbar 6 due to the elastic deformation of the pressing portion 75 can be used to press the first member 7 against the laminate 2.

[0074] In the energy storage device 1 of this embodiment, the first member 7 includes a restricting part 76 that restricts the movement of the busbar 6. As a result, the movement of the busbar 6 is restricted by the restricting part 76 until the busbar 6 is connected to the terminal 14, making the assembly of the energy storage device 1 easier.

[0075] In the energy storage device 1 of this embodiment, the restricting unit 76 releases the restriction when the busbar 6 approaches the stacked body 2. In this way, the restriction on the busbar 6 by the restricting unit 76 is released when the busbar 6 approaches the stacked body 2 (first terminal 14a and second terminal 14b), making it easier to release the restriction during assembly work of the energy storage device 1.

[0076] The energy storage device of the present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of the invention. For example, the configuration of one embodiment can be added to the configuration of another embodiment, and a part of the configuration of one embodiment can be replaced with the configuration of another embodiment. Furthermore, a part of the configuration of one embodiment can be deleted.

[0077] In the above embodiment, the X-axis direction (first direction), the Y-axis direction, and the Z-axis direction (second direction) are orthogonal to each other, but they do not have to be orthogonal. That is, the X-axis direction, the Y-axis direction, and the Z-axis direction only need to intersect.

[0078] In the energy storage device 1 of the above embodiment, the pressing portion 75 is included in the first member 7, but the configuration is not limited to this. The pressing portion 75 may be included in other members or may be an independent member. In the above embodiment, the pressing portion 75 is located between the busbar 6 and the laminate 2, but it may be located in other places. In the above embodiment, the pressing portion 75 presses the first member 7 against the laminate 2 by elastic force, but it may also be configured to press the first member 7 against the laminate 2 by a force other than elastic force. In other words, the pressing portion 75 only needs to be configured to press the first member 7 toward the laminate 2, and its location and specific configuration are not limited.

[0079] In the busbar module 5 of the above embodiment, the restricting unit 76 restricts the movement of the busbar 6 away from the first terminal 14a and the second terminal 14b in the Z-axis direction, but the configuration is not limited to this. The direction of movement of the busbar 6 restricted by the restricting unit 76 is not limited.

[0080] The regulating section 76 may not be included in the first member 7, but may be included in other members. Furthermore, the energy storage device 1 may have a configuration without the regulating section 76.

[0081] In the above embodiment, the restricting portion 76 releases the restriction when the busbar 6 approaches the laminate 2, but the restriction may also be released by other means, such as when the restricting portion 76 is removed from the first member 7.

[0082] 1...Energy storage device, 2...Laminate, 20...Separator, 3...Restraining part, 31...End member, 311...Connecting recess, 312...First connecting hole, 32...Side member, 321...Side member body, 322...Connecting protrusion, 323...Second connecting hole, 33...Connecting member, 5...Busbar module, 6...Busbar, 61...First plate-shaped part, 62...Second plate-shaped part, 63...Busbar protrusion, 631...First upright part, 632...Second upright part, 633...Connecting part, 7...First member, 70...Plate body, 71...First part, 711...Through hole, 72...Second part, 73...Busbar arrangement part, 74...Peripheral wall part, 741...Peripheral wall part Main body, 741a... opening for regulating part, 742... wall part, 742A... one wall part, 742B... the other wall part, 75... pressing part, 751... support part, 752... elastic deformation part, 753... inclined part, 754... contact part, 76... regulating part, 761... strip part, 762... regulating protrusion, 763... contact surface, 764... inclined surface, 10... energy storage element, 10A... first energy storage element (energy storage element), 10B... second energy storage element (energy storage element), 11... case, 12... case body, 13... cover part, 14... terminal, 14a... positive terminal (first terminal), 14b... negative terminal (second terminal), P1... first position, P2... second position

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 busbar connecting the first energy storage element and the second energy storage element; a first member arranged in a second direction intersecting the first direction of the laminate and holding the busbar; and a pressing portion that presses the first member toward the laminate.

2. The energy storage device according to claim 1, wherein the first member includes the pressing portion.

3. The energy storage device according to claim 1 or 2, wherein the pressing portion is elastically deformable and is positioned between the busbar and the laminate, and presses the first member against the laminate by an elastic force on the busbar.

4. The energy storage device according to claim 1 or 2, wherein the first member includes a restricting portion for restricting the movement of the busbar.

5. The energy storage device according to claim 4, wherein the restricting unit releases the restriction when the busbar approaches the laminate.

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