JP2019169379A - Power storage device - Google Patents

Abstract

To provide a power storage device capable of easily configuring a pressing member that presses a plurality of power storage elements.SOLUTION: The power storage device includes: a plurality of power storage elements 100; and a pressing member, having a plurality of pressing portions that are respectively arranged correspondingly to the plurality of power storage elements 100, and press each of the plurality of power storage elements 100. A first pressing portion 621 among the plurality of pressing portions presses a corresponding storage element 100 with a force greater than that of a second pressing portion 622.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a power storage device including a plurality of power storage elements and a pressing member that presses the plurality of power storage elements.

  Conventionally, a power storage device including a plurality of power storage elements and a pressing member that presses the plurality of power storage elements is widely known. For example, Patent Document 1 discloses a power storage device (battery module) having a configuration including a plurality of power storage elements (battery cells) and a pressing member (pressing device) that presses the plurality of power storage elements against a cooling plate. ing.

JP 2011-171029 A

  However, the power storage device configured as described above has a problem that it may be difficult to configure a pressing member that presses a plurality of power storage elements. In other words, in Patent Document 1, the pressing member is configured to press all of the plurality of power storage elements with a large force, but presses all the power storage elements with a large force due to a large number of power storage elements. It may be difficult to make a pressing member that can.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a power storage device that can easily configure a pressing member that presses a plurality of power storage elements.

  In order to achieve the above object, a power storage device according to one embodiment of the present invention includes a plurality of power storage elements and a plurality of presses that are arranged corresponding to the plurality of power storage elements and press the plurality of power storage elements, respectively. A pressing member having a portion, and the first pressing portion among the plurality of pressing portions presses the corresponding storage element with a larger force than the second pressing portion.

  According to this, the power storage device includes a pressing member having a plurality of pressing portions that press each of the plurality of power storage elements, and the first pressing portion of the plurality of pressing portions is more than the second pressing portion. It is comprised so that the corresponding electrical storage element may be pressed with big force. That is, in order to press all the energy storage elements with a large force, it is necessary to arrange all the energy storage elements to be pressed with a large force with all the pressing portions, which may make it difficult to configure the pressing member. Therefore, the pressing force by the pressing portion is varied. As described above, since it is not necessary to press all the power storage elements with a large force by all the pressing portions, it is possible to easily configure a pressing member that presses the plurality of power storage elements.

  The pressing member may have at least two first pressing portions.

  According to this, the pressing member has at least two first pressing portions having a pressing force larger than that of the second pressing portion. That is, when the plurality of power storage elements are fixed to each other to some extent, the whole of the plurality of power storage elements can be pressed by pressing at least two power storage elements with a large force with at least two first pressing portions. it can. Thereby, the press member which presses a some electrical storage element can be comprised easily.

  Further, the two first pressing portions may be arranged corresponding to the power storage elements at both ends of the plurality of power storage elements.

  According to this, the said two 1st press parts of a press member are arrange | positioned corresponding to the electrical storage element of the both ends of several electrical storage elements. Thus, the whole of the plurality of power storage elements can be firmly pressed by pressing the power storage elements at both ends of the plurality of power storage elements with a large force by the two first pressing portions. Thereby, the press member which presses a some electrical storage element can be comprised easily.

  In addition, the plurality of pressing portions are protruding portions that protrude toward the corresponding power storage element, and the first pressing portion is formed with a protruding height of the protruding portion higher than that of the second pressing portion. You may decide to be.

  According to this, in the pressing member, the first pressing portion is formed such that the protruding height of the protruding portion protruding toward the power storage element is higher than that of the second pressing portion. Thus, a 1st press part with a big pressing force can be easily formed by forming the 1st press part with the protrusion height of a convex part higher than a 2nd press part. Thereby, the press member which presses a some electrical storage element can be comprised easily.

  The pressing member includes an inner part disposed on the power storage element side and an outer part disposed at a position sandwiching the inner part between the power storage elements, and the plurality of pressing parts include It may be arranged on the inner side.

  According to this, the pressing member has an inner part on the power storage element side and an outer part sandwiching the inner part between the power storage elements, and the plurality of pressing parts are arranged on the inner part. In this way, a pressing member can be formed with a simple configuration by forming the pressing portion having a different pressing force on the inner side and pressing the pressing portion toward the power storage element on the outer side. Can do. Thereby, the press member which presses a some electrical storage element can be comprised easily.

  Note that the present invention can be realized not only as such a power storage device but also as a pressing member included in the power storage device.

  According to the power storage device of the present invention, a pressing member that presses a plurality of power storage elements can be easily configured.

It is a perspective view which shows the external appearance of the electrical storage apparatus which concerns on embodiment. It is a disassembled perspective view which shows each component at the time of decomposing | disassembling the electrical storage apparatus which concerns on embodiment. It is a perspective view which shows the structure of the electrical storage element which concerns on embodiment. It is the perspective view and sectional drawing which show the structure of the spacer (intermediate spacer) which concerns on embodiment. It is the perspective view and sectional drawing which show the structure of the spacer (end spacer) which concerns on embodiment. It is the perspective view and top view which show the structure of the insulator which concerns on embodiment. It is a perspective view which shows the structure of the side plate which concerns on embodiment. It is the top view and sectional view which show the positional relationship of the electrical storage element which concerns on embodiment, a spacer, an end member, an insulator, and a side plate. It is a perspective view which shows the positional relationship of the electrical storage element which concerns on embodiment, a spacer, an end member, an insulator, and a side plate. It is sectional drawing which shows the positional relationship of the electrical storage element which concerns on embodiment, a spacer, an insulator, and a side plate.

  Hereinafter, a power storage device according to an embodiment of the present invention will be described with reference to the drawings. It should be noted that the embodiments described below show comprehensive or specific examples. Numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of the constituent elements, manufacturing steps, order of manufacturing steps, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. In addition, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims indicating the highest concept are described as optional constituent elements. In each drawing, dimensions and the like are not strictly illustrated.

  In the following description and drawings, the direction in which a pair of electrode terminals in one power storage element is aligned, the direction in which the pair of short side surfaces in a container of one power storage element are opposed, the direction in which insulators are aligned, the direction in which side plates are aligned, or The alignment direction of the insulator and the side plate is defined as the X-axis direction. Further, the alignment direction of the storage elements, the alignment direction of the spacers (intermediate spacers, end spacers), the alignment direction of the end members, the alignment direction of the storage elements, the spacers, and the end members, and a pair of long side surfaces in the container of one storage element The opposing direction or the thickness direction of the power storage element, spacer, or end member is defined as the Y-axis direction. In addition, the direction in which the container body and the lid of the power storage element are aligned, the direction in which the power storage element, the bus bar, and the bus bar holding member are aligned, or the vertical direction is defined as the Z-axis direction. These X-axis direction, Y-axis direction, and Z-axis direction are directions that intersect (orthogonal in this embodiment). Although the case where the Z-axis direction does not become the vertical direction may be considered depending on the usage mode, the Z-axis direction will be described below as the vertical direction for convenience of explanation. In the following description, for example, the X-axis plus direction indicates the arrow direction of the X-axis, and the X-axis minus direction indicates the direction opposite to the X-axis plus direction. The same applies to the Y-axis direction and the Z-axis direction.

(Embodiment)
[1 General Description of Power Storage Device 10]
First, the configuration of the power storage device 10 will be described. FIG. 1 is a perspective view showing an appearance of power storage device 10 according to the present embodiment. FIG. 2 is an exploded perspective view showing each component when the power storage device 10 according to the present embodiment is disassembled.

  The power storage device 10 is a device that can charge electricity from the outside and discharge electricity to the outside. For example, the power storage device 10 is a battery module (assembled battery) used for power storage applications, power supply applications, and the like. Specifically, the power storage device 10 is, for example, an automobile such as an electric vehicle (EV), a hybrid electric vehicle (HEV), or a plug-in hybrid electric vehicle (PHEV), a motorcycle, a watercraft, a snowmobile, an agricultural machine, a construction It is used as a battery for driving a moving body such as a machine or starting an engine.

  As shown in FIGS. 1 and 2, the power storage device 10 includes a plurality (12 in this embodiment) of power storage elements 100, a plurality of spacers 200 and 300 (11 spacers 200 and a pair in this embodiment). Spacer 300), a pair of end members 400, a pair of insulators 600, a pair of side plates 700, a bus bar 800, and a bus bar holding member 900. Further, a bonding member 510 is disposed between the power storage element 100 and the spacer 200, a bonding member 520 is disposed between the power storage element 100 and the spacer 300, and a bonding is performed between the spacer 300 and the end member 400. A member 530 is disposed. In addition, a pair of external terminals 810 (a positive external terminal and a negative external terminal) that are terminals of the power storage device 10 are connected to the bus bar 800. Note that the power storage device 10 also includes a voltage measurement wiring, a temperature measurement wiring, a thermistor, and the like of the power storage element 100, but these are not shown and detailed description is omitted. The power storage device 10 may also include an electrical device such as a circuit board or a relay for monitoring the charge state or the discharge state of the power storage element 100.

  The power storage element 100 is a secondary battery (unit cell) that can charge and discharge electricity, and more specifically, a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. . The power storage element 100 has a flat rectangular parallelepiped shape (square shape) and is disposed adjacent to the spacers 200 and 300. That is, each of the plurality of power storage elements 100 is alternately arranged with each of the plurality of spacers 200 and 300 and arranged in the Y-axis direction. In the present embodiment, eleven spacers 200 are arranged between adjacent ones of twelve power storage elements 100, and the power storage elements 100 at the ends of the twelve power storage elements 100 are arranged. A pair of spacers 300 are arranged at the sandwiched positions.

  Note that the number of power storage elements 100 is not limited to 12, and may be other than 12. Further, the shape of the power storage element 100 is not limited to a rectangular parallelepiped shape, and may be a polygonal column shape other than the rectangular parallelepiped shape, or may be a laminate type power storage element. Moreover, the electrical storage element 100 is not limited to a nonaqueous electrolyte secondary battery, A secondary battery other than a nonaqueous electrolyte secondary battery may be sufficient, and a capacitor may be sufficient as it. In addition, the storage element 100 may be a primary battery that can use stored electricity without being charged by a user, instead of a secondary battery. Further, the power storage element 100 may be a battery using a solid electrolyte. A detailed description of the configuration of the storage element 100 will be described later.

  The spacers 200 and 300 are rectangular and plate-like spacers that are arranged on the side of the electricity storage element 100 (Y-axis plus direction or Y-axis minus direction) and insulate the electricity storage element 100 from other members. Specifically, the spacer 200 is an intermediate spacer that is disposed between two adjacent power storage elements 100 and insulates between the two power storage elements 100. More specifically, bonding members 510 are disposed on both sides of the spacer 200 in the Y-axis direction, and the spacer 200 and the power storage elements 100 on both sides in the Y-axis direction are bonded by the bonding member 510. In the present embodiment, eleven spacers 200 are arranged corresponding to twelve power storage elements 100. However, when the number of power storage elements 100 is other than twelve, the number of spacers 200 is also stored. It is changed according to the number of elements 100.

  The spacer 300 is an end spacer that is disposed between the power storage element 100 at the end and the end member 400 and insulates between the power storage element 100 at the end and the end member 400. Specifically, a bonding member 520 is disposed on the power storage element 100 side of the spacer 300, and the spacer 300 and the power storage element 100 are bonded by the bonding member 520. A joining member 530 is disposed on the end member 400 side of the spacer 300, and the spacer 300 and the end member 400 are joined by the joining member 530. A detailed description of the configuration of the spacers 200 and 300 will be described later.

  The end member 400 and the side plate 700 are members that press the power storage element 100 from the outside in the arrangement direction (Y-axis direction) of the plurality of power storage elements 100. That is, the end member 400 and the side plate 700 press the respective power storage elements 100 included in the plurality of power storage elements 100 from both sides in the arrangement direction by sandwiching the plurality of power storage elements 100 from both sides in the arrangement direction.

  Specifically, the end member 400 is disposed on both sides in the Y-axis direction of the plurality of power storage elements 100, and sandwiches the plurality of power storage elements 100 from both sides in the arrangement direction (Y-axis direction) of the plurality of power storage elements 100. A flat block-shaped end plate (holding member) to be held. The end member 400 is formed of a metal (conductive) member such as steel or stainless steel from the viewpoint of strength or the like. The material of the end member 400 is not particularly limited. For example, the end member 400 may be formed of a high-strength insulating member, or may be subjected to insulation treatment. End member 400 is an example of a side member disposed on the side of power storage element 100.

  The side plate 700 is a long and flat restraining member (restraining bar) that is attached to the end member 400 at both ends and restrains the plurality of power storage elements 100. That is, the side plate 700 is disposed so as to extend in the Y-axis direction so as to straddle the plurality of power storage elements 100 and the plurality of spacers 200 and 300, and the side plate 700 is arranged with respect to the plurality of power storage elements 100 and the plurality of spacers 200 and 300. The restraining force in the arrangement direction (Y-axis direction) is applied. In the present embodiment, the two side plates 700 are arranged at positions where the insulator 600 is sandwiched between the power storage element 100 (specifically, the container second surface 111a described later) on both sides in the X-axis direction of the plurality of power storage elements 100. Is arranged. Each of the two side plates 700 is attached to the X-axis direction ends of the two end members 400 at both ends in the Y-axis direction. Accordingly, the two side plates 700 sandwich and restrain the plurality of power storage elements 100 and the plurality of spacers 200 and 300 from both sides in the X-axis direction and both sides in the Y-axis direction.

  The side plate 700 is fixed to the end member 400 by a plurality of fixing members 701 arranged in the Z-axis direction. In the present embodiment, fixing member 701 is a bolt that penetrates side plate 700 and is joined to end member 400. Note that the attachment of the side plate 700 to the end member 400 is not limited to fixing by bolts, and may be joined by welding or adhesion. Further, like the end member 400, the side plate 700 is a conductive member formed of a metal (conductive) member such as steel or stainless steel from the viewpoint of strength or the like. These members may be formed or may be subjected to insulation treatment. Side plate 700 is an example of an outer portion that is disposed on the outer side of a conductive member that sandwiches an insulating member with power storage element 100 or a pressing member that presses power storage element 100. A detailed description of the configuration of the side plate 700 will be described later.

  The insulator 600 is a long and flat insulating member that is disposed on both sides of the plurality of power storage elements 100 in the X-axis direction and extends in the Y-axis direction. That is, the insulator 600 is disposed between the plurality of power storage elements 100 and the plurality of spacers 200 and 300 and the side plate 700 so as to straddle the plurality of power storage elements 100 and the plurality of spacers 200 and 300. And the side plate 700 are insulated. The insulator 600 is, for example, polycarbonate (PC), polypropylene (PP), polyethylene (PE), polyphenylene sulfide resin (PPS), polyethylene terephthalate (PET), polyether ether ketone (PEEK), tetrafluoroethylene / perfluoroalkyl. It is made of an insulating material such as vinyl ether (PFA), polytetrafluoroethylene (PTFE), polybutylene terephthalate (PBT), poly ether sulfone (PES), ABS resin, ceramic, and composite materials thereof. . The insulator 600 may be formed of any material as long as it is an insulating member, and the two insulators 600 may be formed of members of different materials.

  The insulator 600 also has a function of pressing the plurality of power storage elements 100 in the negative Z-axis direction. That is, the plurality of power storage elements 100 are configured to be mounted on the cooling device 20 (see FIG. 10) and cooled, and the insulator 600 presses the plurality of power storage elements 100 toward the cooling device 20. . The cooling device 20 is a device that cools the power storage device 10 (a plurality of power storage elements 100) by, for example, water cooling. Note that the power storage device 10 has a configuration in which the power storage device 10 is mounted not on the cooling device 20 but on, for example, a vehicle body in which the power storage device 10 is mounted or an exterior body that houses the power storage device 10. May be configured to press the plurality of power storage elements 100 toward the vehicle body or the exterior body. The insulator 600 is disposed on the inner side of the first insulating member disposed on the X-axis direction side of the power storage element 100, the contact member that contacts the power storage element 100, or the pressing member that presses the power storage element 100. It is an example of a part. A detailed description of the configuration of the insulator 600 will be described later.

  The bus bar 800 is a conductive plate-like member that is disposed on the plurality of power storage elements 100 and electrically connects the electrode terminals of the plurality of power storage elements 100. In the present embodiment, bus bar 800 connects a plurality of power storage elements 100 in series by sequentially connecting a positive electrode terminal and a negative electrode terminal of adjacent power storage elements 100. Also, positive and negative external terminals 810 are connected to the bus bar 800 disposed at the end. The bus bar 800 is formed of a conductive member made of metal such as copper, copper alloy, aluminum, aluminum alloy, for example. Note that the connection form of the power storage elements 100 is not particularly limited, and any one of the power storage elements 100 may be connected in parallel.

  The bus bar holding member 900 is a plate that holds the bus bar 800 and other wirings (not shown), can insulate the bus bar 800 and the like from other members, and can regulate the position of the bus bar 800 and the like. Shaped member (bus bar plate, bus bar frame). Specifically, the bus bar holding member 900 has a main body portion and a lid portion, and after opening the lid portion and placing the bus bar 800 or the like on the main body portion, the bus bar holding member 900 is closed to close the bus bar. It is configured to accommodate 800 or the like. The bus bar holding member 900 is formed of an insulating material such as PC, PP, PE, PPS, PET, PEEK, PFA, PTFE, PBT, PES, ABS resin, ceramic, and a composite material thereof.

[2 Detailed Description of Power Storage Element 100]
Next, the structure of the electrical storage element 100 is demonstrated in detail. FIG. 3 is a perspective view showing a configuration of power storage element 100 according to the present embodiment.

  As shown in FIG. 3, the storage element 100 includes a container 110, two electrode terminals 120 (a positive terminal and a negative terminal), two gaskets 121, and an insulating sheet 130. In addition, an electrode body, a current collector (a positive electrode current collector and a negative electrode current collector), an electrolytic solution (nonaqueous electrolyte), and the like are accommodated inside the container 110, but these are not shown. . Note that there is no particular limitation on the type of the electrolytic solution as long as it does not impair the performance of the power storage element 100, and various types can be selected. Further, a gasket is also arranged between the container 110 (a lid body 112 to be described later) and the current collector, and a spacer is arranged on the side of the current collector.

  The container 110 is a rectangular parallelepiped (square) container having a container main body 111 in which an opening is formed and a lid body 112 that closes the opening of the container main body 111. The lid body 112 is a rectangular plate-like member that constitutes the lid portion of the container 110, and is disposed on the Z axis plus direction side of the container body 111. Here, the lid body 112 has a container first surface 112a on which the electrode terminal 120 is disposed. The container first surface 112a is a rectangular plane (outer surface or upper surface) that extends in the X-axis direction and is disposed on the Z-axis plus direction side of the lid body 112. The lid 112 also includes a gas discharge valve 113 that releases the pressure when the pressure inside the container 110 increases, a liquid injection unit 114 that injects an electrolyte into the container 110, and the like. Is provided.

  The container body 111 is a rectangular cylindrical member that forms the main body of the container 110 and has a bottom. The container body 111 has two container second surfaces 111a on both side surfaces in the X-axis direction, and a container first on the Z-axis minus direction side. It has three surfaces 111b and two container fourth surfaces 111c on the side surfaces on both sides in the Y-axis direction. The container second surface 111 a is a rectangular flat surface that forms the short side surface of the container 110. In other words, the container second surface 111a is adjacent to the container first surface 112a, the container third surface 111b, and the container fourth surface 111c, and has a smaller area than the container fourth surface 111c. The container third surface 111 b is a rectangular flat surface that forms the bottom surface of the container 110. In other words, the container third surface 111b is a surface that faces the container first surface 112a and is adjacent to the container second surface 111a and the container fourth surface 111c. The container fourth surface 111 c is a rectangular plane that forms the long side surface of the container 110. In other words, the container fourth surface 111c is a surface that is adjacent to the container first surface 112a, the container second surface 111a, and the container third surface 111b and has a larger area than the container second surface 111a. The container body 111 has a curved container corner 111d at the boundary between the container second surface 111a and the container fourth surface 111c.

  With such a configuration, the container 110 includes an electrode body and the like inside the container main body 111, and then the container main body 111 and the lid body 112 are joined by welding or the like to form a joint 115. Is sealed. That is, the joint part 115 in which the container main body 111 and the lid body 112 are joined to each other is formed on the side surfaces of the container 110 (the surfaces on both sides in the X-axis direction and on both sides in the Y-axis direction). The material of the container 110 (the container main body 111 and the lid body 112) is not particularly limited, but is preferably a weldable (joinable) metal such as stainless steel, aluminum, aluminum alloy, iron, or plated steel sheet.

  The electrode terminal 120 is a terminal (a positive electrode terminal and a negative electrode terminal) of the energy storage device 100 disposed on the container first surface 112a of the container 110, and is electrically connected to the positive electrode plate and the negative electrode plate of the electrode body through the current collector. It is connected to the. That is, the electrode terminal 120 is a metal for introducing electricity stored in the electrode body to the external space of the storage element 100 and for introducing electricity into the internal space of the storage element 100 in order to store electricity in the electrode body. It is a made member. The electrode terminal 120 is made of aluminum, aluminum alloy, copper, copper alloy, or the like.

  The gasket 121 is disposed around the electrode terminal 120 and between the electrode terminal 120 and the lid body 112 of the container 110, and a member for ensuring insulation and airtightness between the electrode terminal 120 and the container 110. It is. The gasket 121 is made of, for example, an insulating material such as PP, PE, PPS, PET, PEEK, PFA, PTFE, PBT, PES, and ABS resin.

  Here, the electrode terminal 120 and the gasket 121 are convex portions protruding from the container first surface 112 a of the container 110. That is, the electrode terminal 120 or the gasket 121 is an example of a convex portion included in the power storage element 100, and the power storage element 100 has two such convex portions on both sides in the X-axis direction of the container first surface 112a. In the present embodiment, power storage element 100 has gasket 121 as the convex portion.

  The electrode body is a power storage element (power generation element) formed by laminating a positive electrode plate, a negative electrode plate, and a separator. Here, the positive electrode plate included in the electrode body is obtained by forming a positive electrode active material layer on a positive electrode base material layer which is a long current collector foil made of metal such as aluminum or an aluminum alloy. The negative electrode plate is obtained by forming a negative electrode active material layer on a negative electrode base material layer which is a long current collector foil made of a metal such as copper or a copper alloy. Moreover, as a positive electrode active material used for a positive electrode active material layer and a negative electrode active material used for a negative electrode active material layer, if a lithium ion can be occluded / released, a well-known material can be used suitably. The current collector is a member (positive electrode current collector and negative electrode current collector) having conductivity and rigidity that are electrically connected to the electrode terminal 120 and the electrode body. The positive electrode current collector is formed of aluminum or an aluminum alloy as in the case of the positive electrode base material layer of the positive electrode plate, and the negative electrode current collector is formed of copper or a copper alloy as in the negative electrode base material layer of the negative electrode plate. Has been.

  The insulating sheet 130 is an insulating sheet-like member that is disposed on the outer surface of the container 110 and covers the outer surface of the container 110. The material of the insulating sheet 130 is not particularly limited as long as the insulation necessary for the power storage element 100 can be ensured. For example, an insulating resin such as PC, PP, PE, PPS, PET, PBT, or ABS resin, Examples thereof include epoxy resin, Kapton, Teflon (registered trademark), silicon, polyisoprene, and polyvinyl chloride.

  Specifically, the insulating sheet 130 covers the entire surface of the container third surface 111b of the container 110, the substantially entire surface of the container second surface 111a and the container fourth surface 111c, and a part of the container first surface 112a. It is one insulating sheet arrange | positioned. As described above, the insulating sheet 130 is disposed on the outer surface of the container 110 with the gas discharge valve 113, the liquid injection part 114, and the electrode terminal 120 of the lid 112 exposed. The insulating sheet 130 is an example of a second insulating member that covers the container third surface 111b.

[3 Detailed Description of Spacer 200]
Next, the configuration of the spacer 200 will be described in detail. FIG. 4 is a perspective view and a cross-sectional view showing the configuration of the spacer 200 according to the present embodiment. Specifically, FIG. 4A is a perspective view showing the components together with the joining member 510 by disassembling the spacer 200. 4B is a cross-sectional view showing the configuration of the upper portion (Z-axis plus direction side portion) when the second member 210 of the spacer 200 of FIG. 4A is cut along the line IVbc-IVbc. FIG. 4C is a cross-sectional view showing the configuration of the lower portion (Z-axis minus direction side portion). In FIG. 4B and FIG. 4C, constituent elements other than the second member 210 are also shown by broken lines for convenience of explanation.

  As shown in FIG. 4, the spacer 200 includes a first member 201 and a second member 210. The first member 201 is a member disposed at a position in contact with the container fourth surface 111c that is the side surface of the electricity storage element 100 on the Y-axis direction side. The first plate portion 220, the second plate portion 230, It has the joining member 240 which joins the 1st board part 220 and the 2nd board part 230. FIG. The second member 210 is a member that is disposed on the side of the first member 201 that intersects the Y-axis direction and supports the end of the first member 201 in the direction that intersects the Y-axis direction. Specifically, an opening 212 that is a rectangular through-hole penetrating in the Y-axis direction is formed at the center position of the second member 210, and the first member 201 is disposed in the opening 212. Thus, the second member 210 is configured to support the periphery of the first member 201.

  More specifically, as shown in FIG. 10 described later, the second member 210 has a main body portion 211, a first protrusion 213, a second protrusion 214, and a third protrusion 215. . The main body 211 is a rectangular ring-shaped and plate-like portion in which the above-described opening 212 is formed at the center position. Further, the main body 211 is provided with a spacer first surface 211a, a joint protrusion 211b, a first recess 211c, a sandwiching portion 211d, a second recess 211e, and a spacer second surface 211f. .

  The spacer first surface 211a is an annular flat surface disposed on the Y axis minus direction side of the main body 211 and around the opening 212, and the joining member 510 on the Y axis minus direction side is disposed. That is, the four rectangular joining members 510 are arranged on the spacer first surface 211a, and the spacer 200 and the storage element 100 on the Y axis minus direction side are joined. The spacer second surface 211f is an annular flat surface disposed on the opposite side (Y-axis plus direction side) to the spacer first surface 211a and around the opening 212, and the joining member 510 on the Y-axis plus direction side. Is placed. That is, four rectangular joining members 510 are arranged on the spacer second surface 211f, and the spacer 200 and the storage element 100 on the Y axis plus direction side are joined.

  Here, the joining member 510 is a member that is disposed between the electricity storage element 100 and the spacer 200 and that joins the electricity storage element 100 and the spacer 200. In this embodiment, the joining member 510 is an adhesive layer such as a double-sided tape. The joining member is not limited to a double-sided tape, and may be an adhesive layer such as an adhesive. It is a mechanical part such as a welded part when joined by welding, a welded part when joined by welding, or caulking or fitting. It may be a joined part or another joined part.

  The joint protrusion 211b is a protrusion that is long in the X-axis direction and protrudes from the spacer first surface 211a and the spacer second surface 211f on both sides in the Y-axis direction. 110 is disposed to face the joint 115. Specifically, the joint protrusion 211 b is disposed at a position where the joint protrusion 211 b contacts the joint 115 of the container 110 of the power storage element 100 when the power storage element 100 is disposed adjacent to the spacer 200. That is, the joint protrusion 211b contacts the joint 115 when the power storage device 10 is manufactured, or when the container 110 of the power storage element 100 is swollen during use of the power storage device 10, Abut.

  The first recess 211c is an annular recess that is formed along the periphery of the opening 212 and that is recessed toward the Y-axis plus direction. That is, the 2nd member 210 has the 1st recessed part 211c in the edge part along the opening part 212, and the 1st member 201 engages with this 1st recessed part 211c in the Y-axis direction. Specifically, the first concave portion 211 c is engaged with the engaging portion 221 disposed at the end portion of the first plate portion 220 of the first member 201, so that the first member 201 is opposed to the second member 210. Is placed. The first member 201 may have a first recess, and the second member 210 may have an engagement portion that engages with the first recess. That is, one of the first member 201 and the second member 210 has a first recess at the end, and the other has an engagement portion 221 that engages with the first recess in the Y-axis direction. That's fine.

  The sandwiching portion 211d is a projection that projects from the inner wall of the first recess 211c toward the inside of the opening 212, and has a function of sandwiching the first member 201. In the present embodiment, a total of eight sandwiching portions 211d are provided on both sides of the first member 201 in the X-axis direction and both sides in the Z-axis direction. That is, the two pairs of sandwiching portions 211d sandwich the first member 201 in the X-axis direction, and the two pairs of sandwiching portions 211d sandwich the first member 201 also in the Z-axis direction. Specifically, the sandwiching part 211d sandwiches the first member 201 in the X-axis direction and the Z-axis direction by engaging the end surfaces of the first member 201 on both sides in the X-axis direction and on both sides in the Z-axis direction. Note that the shape, the number, and the arrangement position of the sandwiching portions 211d are not limited to the above.

  The second recess 211e is a recess recessed in the Y-axis direction from the spacer first surface 211a and the spacer second surface 211f, and is disposed on the side of the first member 201 and along the periphery of the first member 201. It is formed in a long shape. Specifically, the second recess 211e is disposed at a position adjacent to the sandwiching portion 211d on the spacer first surface 211a, and the second recess 211e is formed on the spacer first surface 211a on the second surface 211f. It arrange | positions inside the recessed part 211e (1st member 201 side). In addition, the shape, the number, and the arrangement position of the second recess 211e are not limited to the above. Further, instead of the second recess 211e, a through hole penetrating the main body 211 in the Y-axis direction may be formed.

  With such a configuration, the sandwiching portion 211d and the second recess 211e are arranged in a range from the spacer first surface 211a to the spacer second surface 211f in the Y-axis direction. That is, the sandwiching portion 211d and the second recess 211e are formed without a shape protruding in the Y-axis minus direction from the spacer first surface 211a, and a shape protruding in the Y-axis plus direction from the spacer second surface 211f. It is formed without accompanying. In other words, the spacer first surface 211a and the spacer second surface 211f are recessed or formed in the same plane as the adjacent surface at a position overlapping the sandwiching portion 211d when viewed from the Y-axis direction. Similarly, the spacer first surface 211a and the spacer second surface 211f are recessed or formed in the same plane as the adjacent surface at a position overlapping the second recess 211e when viewed from the Y-axis direction.

  The first protrusion 213 is a long protruding portion that protrudes toward both sides in the Y-axis direction from the end on the Z-axis plus direction side of the main body 211. In the present embodiment, two pairs of first protrusions 213 are arranged side by side in the X-axis direction. The first protrusion 213 faces the X-axis direction side of the convex portion (the gasket 121 in the present embodiment) of the power storage element 100 and is disposed so as to protrude along the convex portion. A detailed description thereof will be described later.

  The second protrusions 214 are protrusions that protrude from both sides of the main body 211 in the X-axis direction and from the Z-axis plus direction side to both sides in the X-axis direction. Here, the second protrusion 214 is formed with a concavo-convex portion having at least one of a concave portion and a convex portion at an end portion in the X-axis direction. Specifically, the concavo-convex portion has a convex portion 214a that protrudes in the Y-axis plus direction, and a concave portion 214b that is formed on the back side of the convex portion 214a and in which the surface of the end portion of the second protrusion 214 is recessed. (See FIG. 8). A detailed description thereof will be described later.

  The third protrusion 215 is a protrusion protruding from the end of the main body 211 on the Z-axis minus direction side toward the Z-axis minus direction, which is the direction toward the bottom surface (the container third surface 111b) of the power storage device 100. . The third protrusions 215 are disposed at both ends of the main body 211 in the X-axis direction and are placed on the insulator 600. A detailed description thereof will be described later.

  Here, the 2nd member 210 is formed with insulating materials, such as PC, PP, PE, PPS, PET, PEEK, PFA, PTFE, PBT, PES, ABS resin, and those composite materials, for example. . The second member 210 may be formed of any material as long as it is an insulating member, and all the second members 210 included in the plurality of spacers 200 are formed of the same material. Alternatively, any one of the second members 210 may be formed of a different material.

  The first member 201 is formed of a member having higher heat resistance than the second member 210. The first member 201 is preferably formed of a member having a higher hardness than the second member 210. Further, the first member 201 is more preferably formed of a member having higher heat insulation than the second member 210. For example, as the first plate portion 220 and the second plate portion 230 having high heat resistance and the like that constitute the first member 201, mica plates (heat) formed by collecting and bonding mica pieces. The decomposition temperature is, for example, about 600 ° C. to 800 ° C.). The first plate portion 220 and the second plate portion 230 may be formed of any material as long as the members have high heat resistance and the first plate portion 220 and the second plate portion 230. It may be formed of a different material. Since the material and the like of the bonding member 240 are the same as the material and the like of the bonding member 510, detailed description thereof is omitted.

  Here, high heat resistance means that it is not easily affected even when exposed to high temperatures and can maintain physical properties (or maintain its shape). For example, glass transition temperature, deflection temperature under load (heat Deformation temperature) or high melting point. In addition, when the glass transition temperature, the deflection temperature under load (thermal deformation temperature), and the melting point of two members are compared, if there are those whose numerical values are reversed, a member having a high melting point is defined as a member having high heat resistance. . Moreover, high hardness means that it is hard and is hard to deform | transform, for example, means that Vickers hardness is high. Moreover, high heat insulation means that heat is not easily transmitted, for example, low heat conductivity. Comparison of these heat resistances (heat resistance, hardness, and heat insulation) can be determined by appropriately measuring by a known method.

  In the above embodiment, the first plate portion 220 and the second plate portion 230 are all formed of members having high heat resistance and the like, but some are formed of members having high heat resistance and the like. You may decide that For example, the first plate portion 220 and the second plate portion 230 are members having high heat resistance and the like due to the configuration in which a member (paint or the like) having high heat resistance or the like is disposed (applied) on the surface of the resin base material. It does not matter if it forms.

  Specifically, the first plate part 220 and the second plate part 230 are arranged at positions where they contact the container fourth surface 111c of the electric storage element 100 when the electric storage element 100 is arranged adjacent to the spacer 200. This is a rectangular and flat member. That is, the first plate part 220 and the second plate part 230 are in contact with the container fourth surface 111c at the time of manufacturing the power storage device 10, or the container 110 of the power storage element 100 swells during use of the power storage device 10. When coming in contact with the container fourth surface 111c. Further, the first plate portion 220 is formed to have a larger width in the X-axis direction and the Z-axis direction and a greater thickness in the Y-axis direction than the second plate portion 230.

  More specifically, the first plate portion 220 protrudes from the first spacer surface 211a toward the Y-axis negative direction side power storage element 100 and faces the central portion of the Y-axis negative direction side power storage element 100. Arranged. The second plate portion 230 is disposed on the opposite side (Y-axis plus direction side) of the first plate portion 220. In other words, the second plate portion 230 protrudes from the spacer second surface 211f toward the Y-axis positive direction side power storage element 100 and is disposed to face the central portion of the Y-axis positive direction side power storage element 100. . The first plate portion 220 is disposed so as to protrude in the Y-axis minus direction from the Y-axis minus direction side joining projection 211b, and the second plate portion 230 is disposed more than the Y-axis plus direction side joining projection 211b. It is recessed in the Y-axis minus direction. Thus, the thickness of the first member 201 is substantially the same as the thickness of the main body 211 of the second member 210 or thicker than the thickness of the main body 211.

  The first plate portion 220 is an example of a central protruding portion, and the central protruding portion (first plate portion 220) and the joint protruding portion 211b on the Y-axis negative direction side are an example of a first protruding portion. The second plate portion 230 is also an example of a central protrusion, and the central protrusion (second plate portion 230) and the joint protrusion 211b on the Y axis plus direction side are examples of the second protrusion. For this reason, it is preferable that the center protrusion has higher heat resistance and higher hardness than the second member 210, and more preferably heat insulation. In other words, the first protrusion and the second protrusion have a portion having higher heat resistance and higher hardness than the portion having the spacer first surface 211a and the spacer second surface 211f of the spacer 200. It is preferable to have a part, and it is more preferable to have a part with high heat insulation.

[4 Detailed Description of Spacer 300]
Next, the configuration of the spacer 300 will be described in detail. FIG. 5 is a perspective view and a cross-sectional view showing the configuration of the spacer 300 according to the present embodiment. Specifically, FIG. 5A is a perspective view showing the spacer 300 on the Y axis plus direction side in FIG. 2 together with the joining members 520 and 530. 5B is a cross-sectional view showing the configuration of the upper portion (Z-axis plus direction side portion) when the spacer 300 of FIG. 5A is cut along the Vbc-Vbc line. (C) is a cross-sectional view showing the configuration of the lower portion (Z-axis minus direction side portion). In FIG. 5B and FIG. 5C, the joining members 520 and 530 are also indicated by broken lines for convenience of explanation. The spacer 300 on the Y axis minus direction side in FIG. 2 has the same configuration.

  As shown in FIG. 5, the spacer 300 includes a main body portion 310, a first protrusion 320, a second protrusion 330, and a third protrusion 340. The main body 310 is a rectangular and plate-shaped part, and is provided with a spacer first surface 311, a first protrusion 312 having a central protrusion 312 a and a joint protrusion 312 b, and a spacer second surface 313. Yes. The spacer 300 is made of the same material as the second member 210 of the spacer 200.

  The spacer first surface 311 is an annular flat surface disposed on the Y axis minus direction side of the main body 310 and around the central protrusion 312a, and the joining member 520 is disposed thereon. That is, four rectangular joining members 520 are disposed on the spacer first surface 311, and the spacer 300 and the storage element 100 on the Y axis minus direction side are joined. The spacer second surface 313 is a rectangular plane disposed on the opposite side (Y-axis plus direction side) of the central projecting portion 312a, and the joining member 530 is disposed thereon. That is, the rectangular bonding member 530 is disposed on the spacer second surface 313, and the spacer 200 and the storage element 100 on the Y axis plus direction side are bonded.

  Here, the joining member 520 is a member that is disposed between the electricity storage element 100 and the spacer 300 and joins the electricity storage element 100 and the spacer 300. The joining member 530 is disposed between the end member 400 and the spacer 300, This is a member for joining the end member 400 and the spacer 300. Since the materials and the like of the bonding members 520 and 530 are the same as the material and the like of the bonding member 510, detailed description thereof is omitted.

  The central protrusion 312a of the first protrusion 312 protrudes from the spacer first surface 311 toward the storage element 100 on the Y axis minus direction side, and faces the center part of the storage element 100 on the Y axis minus direction side. It is a part to be arranged. In addition, the joint protrusion 312b is a protrusion that is long in the X-axis direction and is protruded from the spacer first surface 311 in the Y-axis minus direction side. It arrange | positions facing the junction part 115. FIG. Specifically, the center protrusion 312a and the joint protrusion 312b contact the container fourth surface 111c and the joint 115 of the container 110 of the storage element 100 when the storage element 100 is disposed adjacent to the spacer 300. It is arranged at the position where it touches. That is, the central protrusion 312a and the joint protrusion 312b are in contact with the container fourth surface 111c and the joint 115 at the time of manufacturing the power storage device 10, or the container 110 of the power storage element 100 during use of the power storage device 10. Comes into contact with the container fourth surface 111c and the joint 115 when the container expands. The joint protrusion 312b protrudes to the same position as the central protrusion 312a in the negative Y-axis direction.

  The first protrusion 320 is a long protrusion protruding from the end of the main body 310 on the Z-axis plus direction side toward the Y-axis minus direction. The first protrusion 320 has the same configuration as the first protrusion 213 of the spacer 200, and thus detailed description thereof is omitted.

  The second protrusions 330 are projecting portions that project to both sides in the X-axis direction from portions on both sides in the X-axis direction and on the Z-axis plus direction side of the main body 310. Here, the second protrusion 330 is formed with a concavo-convex portion having at least one of a concave portion and a convex portion at an end portion in the X-axis direction. Specifically, the uneven portion has recesses 331 and 332 in which the surface of the end portion of the second protrusion 330 is recessed (see FIG. 8). A detailed description thereof will be described later.

  The third protrusion 340 is a protruding portion that protrudes from the end of the main body 310 on the Z-axis minus direction side toward the Z-axis minus direction, which is the direction toward the bottom surface (the container third surface 111b) of the power storage device 100. . Note that the third protrusion 340 has the same configuration as the third protrusion 215 of the spacer 200, and thus detailed description thereof is omitted.

[5 Detailed Description of Insulator 600]
Next, the configuration of the insulator 600 will be described in detail. FIG. 6 is a perspective view and a plan view showing a configuration of an insulator 600 according to the present embodiment. Specifically, FIG. 6A is a perspective view showing the insulator 600 on the X-axis plus direction side in FIG. 2, and FIG. 6B is a back side view of the insulator 600 in FIG. It is a perspective view which shows the structure at the time of seeing from. FIG. 6C is an enlarged perspective view showing an enlarged portion surrounded by a broken line in FIG. 6D is an enlarged view of the end portion of the insulator 600 of FIG. 6B viewed from the Y-axis minus direction side and the Z-axis plus direction side from the X-axis minus direction side. FIG. Note that the insulator 600 on the X-axis minus direction side in FIG. 2 has a similar configuration.

  As shown in FIG. 6, the insulator 600 includes an insulator body 610, an insulator first wall 620, and an insulator second wall 630. The insulator body 610 is a rectangular and plate-like part that is disposed on the X-axis plus direction side of the power storage element 100 and is parallel to the YZ plane extending in the Y-axis direction. The insulator first wall 620 is a long and plate-like portion that protrudes from the end on the Z-axis plus direction side of the insulator main body 610 to the X-axis minus direction and extends in the Y-axis direction. The power storage element 100 is disposed on the Z axis plus direction side. The insulator second wall portion 630 is a long and plate-like portion that protrudes from the end of the insulator main body portion 610 on the Z-axis minus direction side to the X-axis minus direction side and extends in the Y-axis direction. The power storage element 100 is disposed on the Z-axis negative direction side.

  Specifically, the insulator main body 610 includes a facing portion 611 and an extending portion 612. The facing portion 611 is disposed on the X-axis direction side of the container second surface 111a so as to face the container second surface 111a of the power storage element 100, and is rectangular and plate-like parallel to the YZ plane extending in the Y-axis direction. It is a part of. The extending portion 612 has a Y-axis direction from the portion of the facing portion 611 on the electrode terminal 120 side (Z-axis plus direction side) to the opposite side of the facing portion 611 from the electrode terminal 120 (Z-axis minus direction side). It is the site | part extended and arrange | positioned in the direction. That is, the insulator main body 610 has a shape in which the Z-axis plus direction side portions of the ends on both sides in the Y-axis direction protrude to both sides in the Y-axis direction.

  Further, the extending portion 612 has a recess 613 and a rib 614. The recessed portion 613 is a notch-shaped recessed portion in which the outer edge of the extending portion 612 on the Z-axis plus direction side is recessed in the Z-axis minus direction. The rib 614 is a protruding portion that protrudes from the surface of the extended portion 612 and is disposed so as to surround the recessed portion 613. Specifically, the rib 614 includes a first rib 614a extending in the Z-axis direction and a second rib 614b extending in the Y-axis direction along the periphery of the recess 613. In the present embodiment, the rib 614 protrudes outward from the outer surface of the extending portion 612, but may protrude inward from the inner surface of the extending portion 612.

  A third rib 615 is provided on the inner surface of the insulator body 610. The third rib 615 is a protruding portion that protrudes inward from the inner surface of the end portion of the facing portion 611 on the Z-axis plus direction side, and is arranged to extend in the Z-axis direction. In the present embodiment, a plurality (11) of third ribs 615 are arranged side by side at equal intervals in the Y-axis direction.

  The insulator first wall portion 620 includes a first pressing portion 621 and a second pressing portion 622 that are a plurality of pressing portions. The plurality of pressing portions (the first pressing portion 621 and the second pressing portion 622) are portions corresponding to the plurality of power storage elements 100 and press the plurality of power storage elements 100, respectively. It is a convex portion protruding toward the corresponding power storage element 100. Specifically, the insulator first wall portion 620 includes at least two first pressing portions 621 and a second pressing portion 622 as a plurality of pressing portions. In the present embodiment, two first pressing portions 621 are arranged corresponding to the power storage devices 100 at both ends of the plurality of power storage devices 100, and a plurality of ( Ten (10) second pressing portions 622 are arranged.

  Specifically, the first pressing portion 621 and the second pressing portion 622 are convex portions in which the surface on the Z-axis plus direction side of the insulator first wall 620 is recessed and the surface on the Z-axis minus direction side is bulged. And arranged at equal intervals in the Y-axis direction (alternately arranged with the third ribs 615). Here, the first pressing portion 621 is formed such that the protruding height of the convex portion is higher than that of the second pressing portion 622. That is, the protruding height H1 of the first pressing portion 621 is formed to be larger than the protruding height H2 of the second pressing portion 622 (see (d) of FIG. 6). Accordingly, the first pressing portion 621 presses the corresponding storage element 100 with a larger force than the second pressing portion 622. The first pressing portion 621 may be in contact with the corresponding power storage element 100, and the second pressing portion 622 may not be in contact with the corresponding power storage element 100.

  The insulator second wall portion 630 is a portion on which the power storage element 100 and the spacers 200 and 300 are placed. A detailed description thereof will be described later.

[6 Detailed Description of Side Plate 700]
Next, the configuration of the side plate 700 will be described in detail. FIG. 7 is a perspective view showing the configuration of the side plate 700 according to the present embodiment. Specifically, FIG. 7A is a perspective view showing the side plate 700 on the X axis plus direction side in FIG. 2, and FIG. 7B is the side plate 700 of FIG. It is a perspective view which shows the structure at the time of seeing from the back side. Note that the side plate 700 on the X-axis minus direction side in FIG. 2 has the same configuration.

  As shown in FIG. 7, the side plate 700 includes a side plate main body portion 710, a side plate first wall portion 720, a side plate second wall portion 730, and a side plate third wall portion 740.

  The side plate body 710 is a rectangular and plate-like part that is disposed on the X axis plus direction side of the insulator body 610 and is parallel to the YZ plane extending in the Y axis direction. The side plate first wall portion 720 is a long and plate-like portion that protrudes from the ends on both sides in the Y axis direction of the side plate main body portion 710 to the X axis minus direction side and extends in the Z axis direction. Yes, fixed to the end member 400. The side plate second wall portion 730 protrudes from the end on the Z-axis plus direction side of the side plate main body portion 710 to the X-axis minus direction side, and is a long and plate-like portion that extends in the Y-axis direction. It is inserted and arrange | positioned at the insulator 1st wall part 620 (refer FIG.10 (b)). The side plate third wall portion 740 protrudes from the end on the Z-axis minus direction side of the side plate main body portion 710 to the X-axis minus direction side, and is a long and plate-like portion extending in the Y-axis direction. It is inserted and arrange | positioned at the insulator 2nd wall part 630 (refer (c) of FIG. 10).

  Here, the side plate main body 710 has a recess 711 having a recessed outer edge on the Z-axis plus direction side and a recessed part 712 having a recessed outer edge on the Z-axis minus direction side at both ends in the Y-axis direction. . That is, the recess 711 is a notch-shaped recess in which the outer edge of the side plate body 710 on the Z-axis plus direction side is recessed in the Z-axis minus direction, and has a curved outer edge shape. The recess 712 is a notch-like recess in which the outer edge of the side plate body 710 on the Z-axis minus direction side is recessed in the Z-axis plus direction, and has a curved outer edge shape.

[7 Explanation of positional relationship of each component]
Next, the positional relationship among the power storage element 100, the spacers 200 and 300, the end member 400, the insulator 600, and the side plate 700 will be described in detail. FIG. 8 is a plan view and a cross-sectional view showing the positional relationship among the electricity storage device 100, the spacers 200 and 300, the end member 400, the insulator 600, and the side plate 700 according to the present embodiment. Specifically, (a) of FIG. 8 is a plan view when the Y-axis minus direction side of the above-described components is viewed from the Z-axis plus direction, and (b) of FIG. 8 is (a) of FIG. ) Is a cross-sectional view of a portion on the X-axis minus direction side and Z-axis plus direction side of each component. In addition, the X-axis plus direction side portion and the X-axis minus direction side portion of each component have the same configuration, and the Y-axis plus direction side portion and the Y-axis minus direction side portion have the same configuration. have. The same applies to the following.

  FIG. 9 is a perspective view showing a positional relationship among the electricity storage device 100, the spacers 200 and 300, the end member 400, the insulator 600, and the side plate 700 according to the present embodiment. Specifically, (a) of FIG. 9 is a perspective view showing the X-axis plus direction side and Y-axis minus direction side portions of the above components, and (b) of FIG. 9 is (a) of FIG. It is a perspective view which shows the structure at the time of removing the side plate 700 from (1).

  FIG. 10 is a cross-sectional view showing the positional relationship among the power storage element 100, the spacer 200, the insulator 600, and the side plate 700 according to the present embodiment. Specifically, FIG. 10A is a view of a cross section when the above-described components are cut along the XZ plane when viewed from the Y-axis minus direction. FIG. 10B is an enlarged view of a portion on the X axis plus direction side and the Z axis plus direction side of FIG. 10A, and FIG. It is a figure which expands and shows the site | part of the X-axis plus direction side and the Z-axis minus direction side of (a). FIG. 10B and FIG. 10C show a configuration when the spacer 200 is removed from FIG. 10A.

  First, as illustrated in FIG. 8A, the first protrusions 213 and 320 of the spacers 200 and 300 are disposed so as to protrude along the convex portion (the electrode terminal 120 or the gasket 121) of the power storage element 100. In the present embodiment, the first protrusions 213 and 320 are arranged so as to be elongated along the gasket 121. That is, the first protrusions 213 and 320 are protrusions that face the X axis direction side of the gasket 121 and protrude along the gasket 121. Specifically, two first protrusions 213 arranged in the X-axis direction are disposed between two gaskets 121 included in one power storage element 100 along the two gaskets 121. The same applies to the first protrusion 320. The two first protrusions 213 or the two first protrusions 320 may be disposed along the two gaskets 121 at positions where the two gaskets 121 are sandwiched.

  More specifically, the protrusion amount of the first protrusions 213 and 320 is formed to be smaller than half the width of the container first surface 112a of the electricity storage element 100 in the Y-axis direction. Accordingly, the first protrusion 213 and the first protrusion 320 adjacent to each other in the Y-axis direction, or the two first protrusions 213 are disposed to face each other and are spaced apart from each other. That is, if two spacers sandwiching the storage element 100 are one spacer and another spacer, one spacer has one first protrusion, and the other spacer has another first protrusion, The first protrusion and the other first protrusion are disposed to face each other and are spaced apart from each other.

  Further, as shown in FIG. 8B, the spacers 200 and 300 are arranged at positions that do not protrude from the power storage element 100 in the X-axis direction. That is, the spacers 200 and 300 are disposed inside the power storage element 100 in the X-axis direction when viewed from the Y-axis direction. In other words, the spacers 200 and 300 are formed so that the width in the X-axis direction is smaller than that of the power storage element 100. Or it can be said that the spacer 200 does not have the site | part which opposes the container 2nd surface 111a.

  In addition, the uneven portions formed on the second protrusions 214 and 330 of the spacers 200 and 300 are disposed apart from the power storage element 100. Specifically, the concavo-convex portion of the second protrusion 214 has a convex portion 214a on the Y axis plus direction side, a concave portion 214b on the Y axis negative direction side of the convex portion 214a, and the convex portion 214a and the concave portion 214b are The power storage device 100 is formed so as to be spaced apart. More specifically, the convex portion 214a is disposed so as to protrude in the Y-axis plus direction along the container corner portion 111d of the electric storage element 100. That is, the convex portion 214a is formed to protrude in a curved shape toward the container corner portion 111d in a state of being separated from the container corner portion 111d. The third rib 615 of the insulator 600 is disposed at a position facing the spacer 200 and is inserted into the recess 214b from the X-axis direction.

  Regarding the spacer 300, the uneven portion of the second protrusion 330 has a recessed portion 331 on the Y axis plus direction side and a recessed portion 332 on the Y axis minus direction side, and the recessed portions 331 and 332 are separated from the power storage element 100. It is formed so that it may be arranged.

  Further, as shown in FIG. 9A, the recess 711 of the side plate 700 has a shape that is larger than the recess 613 of the insulator 600, and the insulator 600 is exposed from the recess 711. It is in a state. That is, the recess 711 is a recess in which the outer edge of the side plate main body 710 on the Z axis plus direction side is recessed from the insulator 600.

  Specifically, the recess 711 is formed to be greatly recessed so that the rib 614 of the insulator 600 is exposed. That is, the rib 614 is disposed in the recess 711. Thereby, the first rib 614a is disposed on the extending direction side of the extending portion 612 (the Y axis minus direction side in FIG. 9) with respect to the side plate 700. Further, the second rib 614b is disposed on the electrode terminal 120 side (the Z-axis plus direction side in FIG. 9) with respect to the side plate 700.

  Further, the recess 711 is disposed on the X-axis direction side (the X-axis plus direction side in FIG. 9) of the end member 400. For this reason, as shown in FIG. 9B, the extending portion 612, the recessed portion 613, and the rib 614 of the insulator 600 are also arranged on the X-axis direction side of the end member 400. Here, as shown in FIG. 8B, the end member 400 is opposite to the power storage element 100 and the first corner portion 410 that is a corner on the power storage element 100 side (Y-axis plus direction side). And a second corner 420 which is a corner on the side (Y-axis minus direction side). The first corner portion 410 is formed to have a larger radius of curvature at the outer edge than the second corner portion 420. That is, the first corner portion 410 has a larger rounded outer edge than the second corner portion 420. And the recessed part 711 is formed so that the curvature radius of an outer edge is larger than the 1st corner | angular part 410. FIG. That is, the recess 711 has a curved outer edge, and the radius of curvature of the curved outer edge is larger than the radius of curvature of the outer edge of the first corner portion 410.

  Further, as shown in FIGS. 10A and 10C, the end of the main body 211 of the spacer 200 on the negative side in the Z-axis direction is the surface on the negative side in the Z-axis direction of the container 110 of the storage element 100 (container The third surface 111b) is disposed on the opposite side of the Z-axis minus direction. That is, the spacer 200 is disposed so that the main body 211 does not protrude from the electricity storage element 100 in the negative Z-axis direction. Here, the edge on the Z-axis minus direction side of the third protrusion 215 of the spacer 200 is on the same plane as the container third surface 111b of the energy storage device 100 (on the same plane P in FIGS. 10A and 10C). ). That is, the spacer 200 is arranged so that the third protrusion 215 does not protrude from the electricity storage element 100 in the negative Z-axis direction. In other words, the third protrusion 215 has a shape that does not come into contact with the surface on the negative side of the Z-axis of the electricity storage element 100.

  With such a configuration, the Z-axis negative direction side surface (the container third surface 111b) of the electricity storage element 100 is disposed in contact with the insulator second wall portion 630 of the insulator 600. The third protrusion 215 of the spacer 200 is also disposed in contact with the insulator second wall portion 630. That is, since the container third surface 111b and the edge of the third projection 215 on the negative side in the Z-axis direction are arranged on the same plane P, they are placed on the second insulator wall 630. . Insulator 600 is further disposed in contact with the surface (container second surface 111a) on the X-axis direction side of power storage element 100. Insulator second wall 630 is fixed to power storage element 100 with side plate third wall 740 inserted.

  10A and 10B, the first pressing portion 621 and the second pressing portion 622 provided on the insulator first wall portion 620 of the insulator 600 are in the X-axis direction of the energy storage device 100. Are pressed toward the negative direction of the Z-axis. Insulator first wall 620 is fixed to power storage element 100 with side plate second wall 730 inserted. Thereby, the electrical storage element 100 is cooled by pressing the container third surface 111b against the cooling device 20. Here, since the plurality of power storage elements 100 are pressed by one insulator 600 and pressed onto the insulator second wall portion 630, the container third surfaces 111b of the plurality of power storage elements 100 are aligned on the same plane P. Be placed. Thereby, the container 3rd surface 111b of the some electrical storage element 100 is pressed against the cooling device 20 equally, and is cooled.

  Although the spacer 200 has been described with reference to FIG. 10, the spacer 300 has the same configuration.

[8 Explanation of effects]
As described above, power storage device 10 according to the present embodiment includes a pressing member (insulator 600 and side plate 700) having a plurality of pressing portions that press each of a plurality of power storage elements 100. The first pressing portion 621 among the pressing portions is configured to press the corresponding power storage element 100 with a larger force than the second pressing portion 622. That is, in order to press all the energy storage elements 100 with a large force, it is necessary to arrange all the energy storage elements 100 to be pressed with a large force with all the pressing portions, and it may be difficult to configure the pressing member. Therefore, the pressing force by the pressing part is varied. Thus, since it is not necessary to press all the electrical storage elements 100 with a big force by all the press parts, the press member which presses the some electrical storage element 100 can be comprised easily.

  Further, the pressing member has at least two first pressing portions 621 having a pressing force larger than that of the second pressing portion 622. That is, when the plurality of power storage elements 100 are fixed to each other to some extent, by pressing at least two power storage elements 100 with at least two first pressing portions 621 with a large force, Can be pressed. Thereby, the pressing member which presses the some electrical storage element 100 can be comprised easily.

  In addition, the two first pressing portions 621 of the pressing member are disposed corresponding to the power storage elements 100 at both ends of the plurality of power storage elements 100. In this way, by pressing the power storage elements 100 at both ends of the plurality of power storage elements 100 with two first pressing portions 621 with a large force, the whole of the plurality of power storage elements 100 can be firmly pressed. it can. Thereby, the pressing member which presses the some electrical storage element 100 can be comprised easily.

  In the pressing member, the first pressing portion 621 is formed so that the protruding height of the protruding portion protruding toward the power storage element 100 is higher than that of the second pressing portion 622. Thus, the 1st press part 621 with a large pressing force can be easily formed by forming the 1st press part 621 higher in the protrusion height of a convex part than the 2nd press part 622. FIG. Thereby, the pressing member which presses the some electrical storage element 100 can be comprised easily.

  In addition, the pressing member has an inner part (insulator 600) on the power storage element 100 side and an outer part (side plate 700) that sandwiches the inner part between the power storage elements 100. Is arranged. In this manner, the pressing member is formed with a simple configuration by forming the pressing portion having a different pressing force on the inner portion and pressing the pressing portion toward the power storage element 100 on the outer portion. be able to. In general, the outer portion is formed of a metal member from the viewpoint of ensuring strength, and the inner portion is formed of a resin member from the viewpoint of ensuring insulation. In this case, the pressing portion is formed of a resin member. By doing, a press part can be formed easily. Thereby, the pressing member which presses the some electrical storage element 100 can be comprised easily.

  Further, in the power storage element 100, the current flows through the electrode terminal 120. Therefore, in order to ensure insulation between the power storage element 100 and the conductive member (side plate 700), It is important to ensure insulation between the conductive member. For this reason, in the 1st insulating member (insulator 600) between the electrical storage element 100 and the said electrically-conductive member, the part by the side of the electrode terminal 120 is extended. Thereby, since the creeping distance between the electrode terminal 120 of the power storage element 100 and the conductive member can be increased, the insulation between the power storage element 100 and the conductive member can be improved.

  Further, a concave portion 711 having a concave outer edge on the Z axis plus direction side (electrode terminal 120 side) is formed in the conductive member. Thereby, since the creeping distance between the electrode terminal 120 of the power storage element 100 and the conductive member can be increased, the insulation between the power storage element 100 and the conductive member can be improved.

  Further, in the configuration in which the power storage element 100 and the spacers 200 and 300 are joined by the joining members 510 and 520, the spacers 200 and 300 are directed from the spacer first surfaces 211a and 311 where the joining members 510 and 520 are disposed toward the power storage element 100. A first projecting portion is provided. As a result, when the power storage element 100 is about to swell, even if the joining members 510 and 520 are compressed by the force that the power storage element 100 swells, the first protrusion can suppress the power storage element 100 from swelling. In addition, even when the joining members 510 and 520 are not compressed due to the force that the power storage element 100 swells due to the hardness of the joint members 510 and 520 being high, the power storage element 100 may swell toward a part other than the joint members 510 and 520. . However, even in this case, it is possible to prevent the power storage element 100 from bulging toward a portion other than the joining members 510 and 520 by arranging the first projecting portion.

  In addition, by forming first protrusions 213 and 320 that protrude along the convex portions (gasket 121) of the power storage element 100 in the spacers 200 and 300, a portion that sandwiches the side surface of the power storage element 100 is provided in the spacer 200 and 300. The positioning of the power storage element 100 and the spacers 200 and 300 can be performed without providing them. Thereby, it is possible to suppress an increase in the width of power storage device 10 and to reduce the size of power storage device 10.

  In addition, in the spacer 200, the first member 201 having high heat resistance is disposed at a position that contacts the side surface of the power storage element 100, so that even when the power storage element 100 reaches a high temperature, the spacer 200 is deformed or melted. Can be suppressed. In addition, the spacer 200 often has a complicated shape in order to insulate and hold the power storage element 100, but in general, it is difficult to process a member having high heat resistance into a complicated shape. is there. For this reason, the spacer 200 is configured to include the second member 210 that supports the end portion of the first member 201 having high heat resistance, so that the second member 210 is insulated or held from the power storage element 100. If it forms so that it can do, it is not necessary to process the 1st member 201 in a complicated shape. In particular, the second member 210 is formed of a resin and can be formed into a complicated shape. Therefore, the second member 210 can be easily formed in a structure that insulates and holds the power storage element 100. Thereby, the 1st member 201 with high heat resistance can be easily arrange | positioned to the spacer 200. FIG. As described above, even when the power storage element 100 becomes high temperature (for example, 600 ° C. or the like) due to abnormality of the power storage element 100, the first member 201 can prevent the spacer 200 from being deformed or melted. Therefore, functions such as swelling suppression and heat insulation of the power storage element 100 included in the spacer 200 can be maintained, and occurrence of defects can be suppressed.

  The spacers 200 and 300 are provided with third protrusions 215 and 340 that protrude in the negative Z-axis direction of the power storage element 100 but do not contact the Z-axis negative direction surface of the power storage element 100. With the three protrusions 215 and 340, the main body portions 211 and 310 of the spacers 200 and 300 are arranged at positions that do not protrude from the surface of the electricity storage element 100 on the Z axis minus direction side. Thereby, since the main body portions 211 and 310 of the spacers 200 and 300 and the third protrusions 215 and 340 can be brought into contact with each other, the surface on the negative side of the Z-axis of the energy storage device 100 can be brought into contact with the cooling device 20. The power storage element 100 can be easily cooled.

  In addition, the spacers 200 and 300 are disposed inside the power storage element 100 in the X-axis direction (that is, formed so as not to protrude from the power storage element 100 in the X-axis direction), so that the width of the power storage device 10 in the X-axis direction is increased. Can be suppressed. In addition, by forming an uneven portion separated from the power storage element 100 at the end in the X-axis direction of the spacers 200 and 300, the power storage element 100 and other members at the end in the X-axis direction of the spacers 200 and 300 The creepage distance between the adjacent power storage elements 100 and the like can be increased. Thereby, the electrical storage device 10 can be reduced in size while insulation at the end in the X-axis direction of the electrical storage element 100 is achieved.

[9 Description of Modification]
The power storage device 10 according to the present embodiment has been described above, but the present invention is not limited to the above embodiment. That is, the embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  For example, in the above embodiment, the insulator 600 has the two first pressing portions 621 corresponding to the power storage elements 100 at both ends. However, two first pressing portions 621 may be disposed corresponding to the two power storage elements 100 other than both ends, or three or more first pressing portions 621 may be disposed, A configuration in which only one first pressing portion 621 is arranged may be used.

  Further, in the above embodiment, the first pressing portion 621 has a higher protrusion height than the second pressing portion 622, so that the power storage element 100 has a greater force than the second pressing portion 622. It was decided to press with. However, the first pressing portion 621 and the second pressing portion 622 are configured by springs, for example, and the first pressing portion 621 presses the storage element 100 with a stronger elastic force than the second pressing portion 622. May be.

  In the above embodiment, the insulator 600 has the pressing portions (the first pressing portion 621 and the second pressing portion 622), but the side plate 700 has the pressing portion. Also good.

  In the above embodiment, both the two insulators 600 have the above-described configuration, but any one of the insulators 600 may have a different configuration from the above. The same applies to the side plate 700, the power storage element 100, and the spacers 200 and 300.

  In addition, embodiments constructed by arbitrarily combining the constituent elements included in the above-described embodiment and its modifications are also included in the scope of the present invention.

  Further, the present invention can be realized not only as such a power storage device 10 but also as an insulator 600 and a side plate 700.

  The present invention can be applied to a power storage device including a power storage element such as a lithium ion secondary battery.

DESCRIPTION OF SYMBOLS 10 Power storage device 20 Cooling device 100 Power storage element 110 Container 111a Container second surface 111b Container third surface 111c Container fourth surface 112a Container first surface 120 Electrode terminal 130 Insulating sheet 200, 300 Spacer 400 End member 410 First corner 420 Second corner portion 600 Insulator 611 Opposing portion 612 Extension portion 613 Recessed portion 614 Rib 614a First rib 614b Second rib 621 First pressing portion 622 Second pressing portion 700 Side plate 711, 712 Recessed portion

Claims (5)

A plurality of power storage elements;
A pressing member that is arranged corresponding to each of the plurality of power storage elements and has a plurality of pressing portions that press each of the plurality of power storage elements, and
The first pressing portion among the plurality of pressing portions presses the corresponding power storage element with a larger force than the second pressing portion. The power storage device according to claim 1, wherein the pressing member includes at least two first pressing portions. The power storage device according to claim 2, wherein the two first pressing portions are arranged corresponding to power storage elements at both ends of the plurality of power storage elements. The plurality of pressing portions are convex portions protruding toward a corresponding power storage element,
The power storage device according to any one of claims 1 to 3, wherein the first pressing portion is formed such that a protruding height of the convex portion is higher than that of the second pressing portion. The pressing member has an inner part disposed on the power storage element side, and an outer part disposed at a position sandwiching the inner part between the power storage elements,
The power storage device according to claim 1, wherein the plurality of pressing portions are disposed on the inner side portion.

Images