JP2018055814A - Power storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage device capable of preventing a power storage element from being displaced from a spacer when stacking the power storage element.SOLUTION: A power storage device comprises: a power storage element 100a; a first spacer 300a which is disposed at a first direction side of the power storage element 100a while being abutted with the power storage element 100a; and a first arrangement part 100b which is disposed at a first direction side of the first spacer 300a while being abutted with the first spacer 300a. The first spacer 300a includes a main body part 310 extending from one end 311 to the other end 312 in a second direction that crosses a first direction. In the main body part 310, a width of an abutment portion of the power storage element 100a and the first arrangement part 100b in the first direction becomes larger gradually from the one end 311 to the other end 312.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a power storage device including a power storage element and a spacer disposed in contact with the power storage element.

  Conventionally, a power storage device including a power storage element and a spacer disposed in contact with the power storage element is widely known (see, for example, Patent Document 1).

Japanese Patent Laying-Open No. 2015-201289

  Here, conventionally, in the manufacturing process of the power storage element, a gradient may occur on the outer surface of the container of the power storage element. In such a case, when the power storage element is stacked, the power storage element may be displaced from the spacer without being uniformly pressed against the spacer.

  The present invention has been made to solve the above-described problem, and an object of the present invention is to provide a power storage device that can suppress the displacement from the spacer when the power storage elements are stacked.

  To achieve the above object, a power storage device according to one embodiment of the present invention includes a power storage element, a first spacer disposed in contact with the power storage element on a first direction side of the power storage element, and the first spacer. A first arrangement portion disposed in contact with the first spacer on the first direction side of the one spacer, the first spacer from the one end portion in the second direction intersecting the first direction to the other A main body portion extending to an end portion, wherein the main body portion has a width in the first direction of a contact portion between the power storage element and the first arrangement portion that increases toward the other end portion from the one end portion. Become.

  According to this, the power storage device includes the first spacer disposed in contact with the power storage element and the first placement portion, and the main body portion of the first spacer is connected to the power storage element and the first placement portion. The contact portion has a shape in which the width increases from one end to the other end. Here, the storage element may have a gradient on the outer surface of the container when the container is manufactured by drawing or the like. For this reason, by adding a gradient to the portion of the first spacer that contacts the power storage element, the first spacer presses the power storage element evenly, and when the power storage element is stacked, it is displaced from the first spacer. Can be suppressed.

  Further, the first spacer may further include a first rib disposed between at least one of the power storage element and the first arrangement portion and on the other end side of the main body portion. Good.

  According to this, the first spacer is likely to vary in size on the other end side of the main body having a large width, but the first spacer has the first rib on the other end side of the main body. The variation can be absorbed. Thereby, it can further suppress that it shifts from the 1st spacer, when an electrical storage element is stacked.

  Further, the first rib may have a width in the first direction that increases in a direction from the one end to the other end.

  According to this, the other end of the main body portion of the first spacer is formed by giving a gradient to the width of the first rib so that the width of the first rib increases from the one end portion side toward the other end portion side. It is possible to further absorb variations in dimensions on the part side.

  The first spacer may further include a second rib that abuts against a corner portion on the one end side of the power storage element.

  According to this, the first spacer has the second rib that comes into contact with the corner portion on the one end portion side of the power storage element, so that the second rib is brought into contact with the corner portion of the power storage element, and the power storage element is It is possible to suppress the jumping from one spacer to one end side.

  The first rib may be higher in rigidity than the second rib.

  According to this, at the end on the other end side of the electric storage element, the first spacer can firmly hold the electric storage element and fix it by the first rib having relatively high rigidity. In addition, at the end portion on the one end side of the electricity storage element, the second rib having relatively low rigidity suppresses stress from being applied to the corner portion of the electricity storage element, so that the welded portion of the corner portion is damaged. Can be suppressed.

  Further, the second rib may have a width in the first direction that decreases as it goes in the direction from the one end to the other end.

  According to this, the 2nd rib becomes a shape which is easy to hold down that an electrical storage element protrudes from the 1st spacer to the one end part side by narrowing toward the other end part side from the one end part side.

  Further, a second spacer disposed in contact with the power storage element on a side opposite to the first direction of the power storage element, and a side opposite to the first direction of the second spacer on the first direction. A second arrangement part arranged in contact with the two spacers, wherein the second spacer is a main body part extending from one end part to the other end part in the second direction, and the storage element and the second arrangement part You may decide to have a main-body part from which the width | variety in said 1st direction of the contact part with a part becomes large as it goes to the said other end part from the said one end part.

  According to this, the storage element is sandwiched between two spacers (first spacer and second spacer) that are widened from one end to the other end, so that the storage element is displaced from the spacer when the storage element is stacked. Can be effectively suppressed.

  Note that the present invention can be realized not only as such a power storage device but also as a spacer (first spacer, second spacer) included in the power storage device.

  According to the power storage device of the present invention, it is possible to suppress deviation from the spacer when the power storage elements are stacked.

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 disassembled perspective view which shows each component at the time of decomposing | disassembling the electrical storage unit which concerns on embodiment. It is sectional drawing which shows the structure of the spacer which concerns on embodiment, and the positional relationship of an electrical storage element and a spacer. It is a side view which shows the structure of the spacer which concerns on embodiment. It is sectional drawing which shows the structure of the main-body part of the 1st spacer which concerns on the modification 1 of embodiment. It is sectional drawing which shows the structure of the main-body part of the 1st spacer which concerns on the modification 2 of embodiment.

  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 each of the embodiments described below shows a comprehensive or specific example. Numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of constituent elements, 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.

  Further, in the following description and drawings, the storage element alignment direction, the spacer alignment direction, the clamping member alignment direction, the opposing direction of the long side surface of the storage element container, or the thickness direction of the container is the X-axis direction. It is defined as In addition, the direction in which the electrode terminals are arranged in one power storage element or the facing direction of the short side surface of the container of the power storage element is defined as the Y-axis direction. Further, the vertical direction of the electricity storage element (the direction in which gravity acts in a state where the container lid is installed facing upward) 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 direction plus side indicates the arrow direction side of the X axis, and the X axis direction minus side indicates the opposite side to the X axis direction plus side. The same applies to the Y-axis direction and the Z-axis direction.

  Furthermore, in the following, the direction toward the X axis direction plus side is also referred to as a first direction, and the direction toward the Z axis direction minus side is also referred to as a second direction. Further, the direction toward the minus side in the X-axis direction is also referred to as a direction opposite to the first direction.

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

  The power storage device 1 is a device that can charge electricity from the outside and discharge electricity to the outside. For example, the power storage device 1 is a battery module used for power storage use, power supply use, and the like. Specifically, the power storage device 1 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 Used as a battery for starting engines of moving objects such as machines.

  Here, as shown in FIGS. 1 and 2, the power storage device 1 includes an exterior body 10 including a first exterior body 11 and a second exterior body 12, and an electrical storage unit 20 accommodated inside the exterior body 10. And a holding member 30 and bus bars 41 and 42.

  The exterior body 10 is a rectangular (box-shaped) container (module case) that constitutes the exterior body of the power storage device 1. That is, the exterior body 10 houses the power storage unit 20 and the like to protect it from impacts and the like. In addition, from the viewpoint of weight reduction and the like, the outer package 10 is made of an insulating material such as polycarbonate (PC), polypropylene (PP), polyethylene (PE), polyphenylene sulfide resin (PPS), polybutylene terephthalate (PBT), or ABS resin. It is comprised with the property resin material. Thus, the outer package 10 avoids the storage unit 20 and the like from coming into contact with an external metal member or the like. The exterior body 10 includes a first exterior body 11 constituting a lid body of the exterior body 10 and a second exterior body 12 constituting a main body of the exterior body 10. A positive external terminal 13 and a negative external terminal 14 are provided.

  The power storage unit 20 has a plurality of power storage elements 100 (in this embodiment, twelve power storage elements 100) and a plurality of bus bars 200, and is connected to the first exterior body 11 via the bus bars 41 and 42. The positive electrode external terminal 13 and the negative electrode external terminal 14 provided are electrically connected. In addition, the power storage unit 20 is arranged in the X-axis direction (first direction) in a state where the plurality of power storage elements 100 are placed vertically, and is disposed in the second exterior body 12. The power storage unit 20 is housed inside the exterior body 10 by covering the first exterior body 11 from above. The detailed configuration of the power storage unit 20 will be described later.

  The holding member 30 holds the bus bars 41 and 42, other electrical components such as relays, wirings, and the like (not shown), insulation between the bus bars 41 and 42 and the other members, and the bus bar 41, This is an electrical component tray capable of regulating the position of 42 or the like. The holding member 30 is made of, for example, an insulating resin material such as PC, PP, PE, PPS, PBT, or ABS resin. The bus bars 41 and 42 are conductive members that electrically connect the bus bar 200 in the power storage unit 20 to the positive external terminal 13 and the negative external terminal 14 provided in the first exterior body 11. The bus bars 41 and 42 are made of, for example, copper, copper alloy, aluminum, aluminum alloy, or the like.

  Next, the configuration of the power storage unit 20 will be described in detail. FIG. 3 is an exploded perspective view showing each component when the power storage unit 20 according to the present embodiment is disassembled.

  As shown in the figure, the power storage unit 20 includes a plurality of power storage elements 100, a plurality of bus bars 200, a plurality of spacers 300, a pair of clamping members 400, a plurality of restraining members 500, a bus bar frame 600, And a heat shield plate 700.

  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 shape and is disposed adjacent to the spacer 300. That is, each of the plurality of power storage elements 100 is alternately arranged with each of the plurality of spacers 300 and arranged in the X-axis direction (first direction). In the present embodiment, twelve power storage elements 100 are arranged adjacent to eleven spacers 300 alternately. In addition, 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.

  Moreover, as shown in the figure, the electricity storage element 100 includes a container 110 and electrode terminals 120 (a positive electrode terminal 121 and a negative electrode terminal 122). In addition, an electrode body (also referred to as a power storage element or a power generation element), a current collector (a positive electrode current collector and a negative electrode current collector), and the like are disposed inside the container 110, and an electrolytic solution (nonaqueous electrolyte) or the like is provided. Although it is enclosed, detailed description is omitted.

  The container 110 includes a container main body having a rectangular cylindrical shape made of metal and having a bottom, and a metal lid that closes an opening of the container main body. As described above, the container 110 has a lid on the positive side in the Z-axis direction (opposite side in the second direction) and a long side surface on the side surfaces on both sides in the X-axis direction (first direction and the opposite side) in FIG. This is a rectangular parallelepiped container having side surfaces 111 and 112) to be described later, short side surfaces on the side surfaces on both sides in the Y-axis direction, and bottom surfaces on the Z-axis direction minus side (second direction side). The material of the container 110 is not particularly limited, but is preferably a weldable metal such as stainless steel, aluminum, or aluminum alloy. In addition, the electrode terminal 120 (the positive electrode terminal 121 and the negative electrode terminal 122) is electrically connected to the electrode body (the positive electrode plate and the negative electrode plate) via the current collector (the positive electrode current collector and the negative electrode current collector). The metal electrode terminal is attached to the lid of the container 110.

  The bus bar 200 is a conductive member that is electrically connected to each electrode terminal of the plurality of power storage elements 100 in the power storage unit 20. In addition, the bus bar 200 disposed at the end is connected to the above-described bus bars 41 and 42, and is thereby electrically connected to the positive external terminal 13 and the negative external terminal 14. The bus bar 200 is made of, for example, copper, copper alloy, aluminum, aluminum alloy, or the like.

  The spacer 300 is a plate-like member that is disposed on the side (X-axis direction plus side or minus side) of the electricity storage element 100 and insulates the electricity storage element 100 from other members. For example, the spacer 300 is made of an insulating resin such as PC, PP, PE, PPS, PBT, or ABS resin. That is, the spacer 300 is disposed between two adjacent power storage elements 100 and insulates between the two power storage elements 100. In the present embodiment, eleven spacers 300 are arranged between each of the twelve power storage elements 100. The spacer 300 may be formed of any material as long as it is an insulating member, or may be formed of the same material, or any of the spacers may be made of different materials. It may be formed of any member.

  In addition, the spacer 300 is formed so as to cover approximately half of the front side or back side of the power storage element 100 (substantially half when divided into two in the X-axis direction). In other words, the recesses are formed on both the front side and the back side (both sides in the X-axis direction) of the spacer 300, and approximately half of the power storage element 100 is inserted into the recesses. With such a configuration, the spacer 300 on the side of the power storage element 100 covers most of the power storage element 100, so that the insulating property between the power storage element 100 and another conductive member is covered by the spacer 300. Can be improved. A detailed description of the spacer 300 will be described later.

  The clamping member 400 and the restraining member 500 are members that press the power storage element 100 from the outside in the stacking direction of the electrode bodies of the power storage element 100. That is, the sandwiching member 400 and the restraining member 500 press the respective power storage elements 100 included in the plurality of power storage elements 100 from both sides by sandwiching the plurality of power storage elements 100 from both sides in the stacking direction. Note that the stacking direction of the electrode bodies of the power storage element 100 is a direction in which the positive electrode, the negative electrode, and the separator of the electrode body are stacked, and is the same as the arrangement direction of the plurality of power storage elements 100 (X-axis direction (first direction)). Direction. That is, the plurality of power storage elements 100 are arranged in the stacking direction.

  Specifically, the clamping member 400 is a flat plate member (end plate) disposed on both sides of the plurality of power storage elements 100 in the X-axis direction (the first direction and the opposite side). The spacer 300 is sandwiched and held from both sides in the arrangement direction (X-axis direction) of the plurality of power storage elements 100 and the plurality of spacers 300. The sandwiching member 400 has two layers having an insulating member similar to the spacer 300 on the inner side (side facing the power storage element 100) and a metal member such as steel or stainless steel on the outer side from the viewpoint of ensuring insulation and strength. It has a structure. Note that the clamping member 400 may be formed of one insulating member having high strength.

  The restraining member 500 is a long and flat member (constraint bar) that is attached to the sandwiching member 400 at both ends and restrains the plurality of power storage elements 100. That is, the restraining member 500 is disposed so as to straddle the plurality of power storage elements 100 and the plurality of spacers 300, and restrains the plurality of power storage elements 100 and the plurality of spacers 300 in their arrangement direction (X-axis direction). Giving power. The restraining member 500 is preferably formed of a metal member such as steel or stainless steel, for example, as with the clamping member 400, but may be formed of a member other than metal.

  The bus bar frame 600 is a member that can insulate the bus bar 200 from other members and regulate the position of the bus bar 200. The bus bar frame 600 is formed of an insulating resin material such as PC, PP, PE, PPS, PBT, or ABS resin. The heat shield plate 700 is a plate-like member having heat insulation disposed in the exhaust passage of the gas discharge valve of the power storage element 100.

  Next, the configuration of the spacer 300 and the positional relationship between the power storage element 100 and the spacer 300 will be described in detail. FIG. 4 is a cross-sectional view illustrating the configuration of the spacer 300 according to the present embodiment and the positional relationship between the power storage element 100 and the spacer 300. That is, this figure is a view in which the spacer 300 is cut along a plane parallel to the XZ plane and viewed from the Y axis direction minus side together with the power storage element 100. This figure is a conceptual diagram, and the dimensions do not necessarily match the actual dimensions. FIG. 5 is a side view showing the configuration of the spacer 300 according to the present embodiment. That is, this figure is a view of the spacer 300 as seen from the X axis direction plus side.

  Hereinafter, description will be given by taking three power storage elements 100 and two spacers 300 disposed between the three power storage elements 100 as an example. In the following, as shown in FIG. 4, the three power storage elements 100 are referred to as a power storage element 100a, a first placement portion 100b, and a second placement portion 100c, and the two spacers 300 are referred to as the first spacer 300a and the first placement portion 100a. This will be described as the second spacer 300b.

  That is, the first spacer 300a is a spacer that is disposed in contact with the power storage element 100a on the first direction side (X-axis direction plus side) of the power storage element 100a. The first placement portion 100b is a power storage element that is placed in contact with the first spacer 300a on the first direction side (X-axis direction plus side) of the first spacer 300a. The second spacer 300b is a spacer disposed on the opposite side (X-axis direction minus side) of the power storage element 100a in contact with the power storage element 100a. The second placement portion 100c is a power storage element that is placed in contact with the second spacer 300b on the opposite side (X-axis direction minus side) of the second spacer 300b.

  First, the configuration of the first spacer 300a will be described in detail. As shown in FIGS. 4 and 5, the first spacer 300 a includes a main body part 310, a first protrusion part 320, a second protrusion part 330, a first rib 340, and a second rib 350. Yes.

  The main body part 310 is a part that constitutes the main body of the first spacer 300a, which is arranged between the power storage element 100a and the first arrangement part 100b. Specifically, the main body 310 has a rectangular shape that extends from one end 311 to the other end 312 in the second direction (Z-axis minus direction) that intersects the first direction (X-axis plus direction). And it is a flat part. The one end 311 is the upper end of the first spacer 300a (the end on the Z-axis direction plus side), and the other end 312 is the lower end of the first spacer 300a (the end on the minus side in the Z-axis direction). Part).

  In the main body 310, the width in the first direction of the contact portion between the power storage element 100 a and the first arrangement portion 100 b increases as it goes from the one end 311 to the other end 312. Specifically, the main body portion 310 includes side surface portions 313 and 314 that are inclined from the one end portion 311 toward the other end portion 312. The side surface portion 313 is a side surface of the main body portion 310 on the plus side in the X-axis direction, and is a planar portion that is inclined toward the plus side in the X-axis direction toward the other end portion 312 from the one end portion 311. The side surface portion 314 is a side surface on the minus side in the X-axis direction of the main body portion 310, and is a planar portion that is inclined toward the minus side in the X-axis direction as it goes from the one end portion 311 toward the other end portion 312.

  In FIG. 4, the side surface portions 313 and 314 are illustrated with an increased inclination angle so that the side surface portions 313 and 314 are inclined. However, the side surface portions 313 and 314 include, for example, both end portions (upper end portion and lower end portion). ) In the second direction with respect to the difference of 10 cm in the second direction is an inclined surface of about 0.05 mm to 1 mm.

  Here, in the storage element 100a, the container 110 is manufactured by drawing, and the container 110 has a width in the first direction so that the container 110 can be easily pulled out of the mold during the drawing. It gets smaller as it goes in the direction. That is, the container 110 has the side surface parts 111 and 112 inclined toward the second direction. The side surface portion 111 is a side surface on the plus side in the X-axis direction of the container 110, and is a planar portion that is inclined toward the minus side in the X-axis direction as it goes in the second direction. The side surface portion 112 is a side surface of the container 110 on the minus side in the X-axis direction, and is a planar portion that is inclined to the plus side in the X-axis direction as it goes in the second direction. The same applies to the container 110 of the first arrangement part 100b and the container 110 of the second arrangement part 100c.

  Further, the side surface portions 111 and 112 are disposed to face the side surface portions 314 and 313 described above, and have substantially the same inclination angle as the side surface portions 314 and 313 facing each other. That is, the side surface portion 111 of the container 110 of the power storage element 100a is an inclined surface having substantially the same inclination angle as the side surface portion 314 along the side surface portion 314 of the first spacer 300a. Moreover, the side part 112 of the container 110 of the 1st arrangement | positioning part 100b is an inclined surface which has the inclination angle substantially the same as the said side part 313 along the side part 313 of the 1st spacer 300a. The same applies to the other side portions 111 and 112.

  Thus, when the power storage elements 100a and 100b are stacked, the side surface portion 111 of the power storage device 100a abuts on the side surface portion 314 of the first spacer 300a, and the side surface portion 112 of the first arrangement portion 100b is the first spacer. It contacts the side surface portion 313 of 300a. In other words, the main body 310 of the first spacer 300a extends from the one end 311 to the other end 312 as a contact portion with the power storage element 100a and the first arrangement portion 100b, and the first direction of the contact portion is the first direction. The width increases at one end 311 toward the other end 312.

  The first projecting portion 320 is a long portion projecting from the one end portion 311 of the main body portion 310 to both sides in the X-axis direction and extending in the Y-axis direction. The container 110 of the power storage element 100a and the container of the first arrangement portion 100b. 110 is disposed above 110. In addition, the 1st protrusion part 320 is the shape where the location where the electrode terminal 120 and a gas exhaust valve are located was notched so that it might not overlap with the electrode terminal 120 and gas exhaust valve of the electrical storage element 100a and the 1st arrangement | positioning part 100b. have.

  The second projecting portion 330 is an elongated portion that projects from the other end portion 312 of the main body portion 310 to both sides in the X-axis direction and extends in the Y-axis direction. The second projecting portion 330 includes the container 110 of the power storage element 100a and the first placement portion 100b. Arranged below the container 110. That is, the 2nd protrusion part 330 is arrange | positioned so that the container 110 of the electrical storage element 100a and the container 110 of the 1st arrangement | positioning part 100b may be pinched | interposed from the upper and lower sides with the 1st protrusion part 320.

  The first rib 340 is a rib disposed between at least one of the power storage element 100 a and the first arrangement portion 100 b and on the other end portion 312 side of the main body portion 310. In the present embodiment, the first rib 340 is disposed between both the power storage element 100a and the first arrangement portion 100b, that is, on the other end portion 312 side of the side surface portions 313 and 314 of the main body portion 310. Yes. Specifically, the first rib 340 is a long rib that protrudes from the other end 312 side of the side surfaces 313 and 314 and extends in the second direction, and the lower end is connected to the second protrusion 330. ing. Further, in each of the side surface portions 313 and 314, four first ribs 340 are arranged at substantially equal positions in the Y-axis direction.

  The first rib 340 has a width in the first direction that increases in the direction from the one end 311 to the other end 312 (second direction). That is, the first rib 340 has a tip end surface (an end surface in contact with the power storage element 100 a or the first arrangement portion 100 b) having a steeper inclination angle than the side surface portions 313 and 314. In addition, the end surface of the front-end | tip of this 1st rib 340 is an inclined surface whose difference to the 1st direction with respect to the difference 1cm of the 2nd direction of both ends (upper end part and lower end part) is about 0.01 mm-0.2 mm, for example It is.

  In the present embodiment, the first rib 340 has a long rectangular shape when viewed from the X-axis direction, but is not limited to this shape, and the width increases toward the second direction. It does not matter if it has a shape. Further, the number of first ribs 340 disposed on each of the side surface portions 313 and 314 is not limited to four, and the first ribs 340 may not be disposed at equal positions.

  Further, in the present embodiment, the first rib 340 has a rectangular cross-sectional shape when cut by a plane parallel to the XY plane, but a triangular shape with a pointed tip, a semicircular shape, a semi-oval shape, Any shape such as a semi-elliptical shape may be used. Further, the first rib 340 may have a configuration in which the lower end portion is not connected to the second protruding portion 330.

  The second rib 350 is a rib that is disposed on the one end 311 side of the main body 310 and contacts the corner 113 on the one end 311 side of the power storage element 100a and the first disposing portion 100b. In other words, the second rib 350 on the negative side in the X-axis direction contacts the corner 113 on the one end 311 side of the container 110 of the storage element 100a, and the second rib 350 on the positive side in the X-axis direction has the first arrangement. The part 100b contacts the corner 113 on the one end 311 side of the container 110. Specifically, the second rib 350 is a rib protruding from the one end 311 side of the side surface portions 313 and 314, and the upper end portion is connected to the first protruding portion 320. In each of the side surface portions 313 and 314, two second ribs 350 are arranged in the Y-axis direction.

  In addition, the second rib 350 has a width that decreases in the first direction in the direction from the one end 311 toward the other end 312 (second direction). That is, the second rib 350 has a long triangular shape in the X-axis direction when viewed from the Y-axis direction.

  In the present embodiment, the second rib 350 has a rectangular shape when viewed from the X-axis direction. However, the second rib 350 is not limited to this shape, and may have a shape that decreases in width toward the second direction. It doesn't matter. Further, the number of the second ribs 350 disposed on each of the side surface portions 313 and 314 is not limited to two, and the arrangement position is not particularly limited. Further, in the present embodiment, the second rib 350 has a rectangular cross-sectional shape when cut along a plane parallel to the XY plane, but may have any shape such as a triangular shape with a sharp tip. It doesn't matter. Further, the second rib 350 may have a configuration in which the upper end portion is not connected to the first protruding portion 320.

  Here, the first rib 340 is thicker (the width in the Y-axis direction) than the second rib 350. For this reason, the first rib 340 has higher rigidity than the second rib 350. In addition, when the thickness of the 1st rib 340 or the 2nd rib 350 is not constant, the average value of the thickness of the 1st rib 340 is larger than the average value of the thickness of the 2nd rib 350, or the 1st rib 340 The first rib 340 may be higher in rigidity than the second rib 350 because the maximum thickness of the second rib 350 is larger than the maximum thickness of the second rib 350.

  Moreover, in this Embodiment, the main-body part 310 which comprises the 1st spacer 300a, the 1st protrusion part 320, the 2nd protrusion part 330, the 1st rib 340, and the 2nd rib 350 are the same materials. It is a formed integrally molded product. However, the present invention is not limited to this, and any part constituting the first spacer 300a may be formed of a different material, or any part may be formed separately.

  Although the configuration of the first spacer 300a has been described above, the configuration of the second spacer 300b is the same as the configuration of the first spacer 300a. That is, the second spacer 300b includes the main body portion 310, the first protruding portion 320, the second protruding portion 330, the first rib 340, and the second rib 350, similarly to the first spacer 300a. Yes. The main body 310 extends from the one end 311 in the second direction to the other end 312, and the width in the first direction of the contact portion between the power storage element 100 a and the second arrangement portion 100 c is from the one end 311. The distance increases toward the other end 312. The same applies to other parts.

  As described above, the power storage device 1 according to the present embodiment includes the first spacer 300a disposed in contact between the power storage element 100a and the first placement portion 100b. The main body portion 310 has a shape in which the width of the contact portion between the power storage element 100 a and the first arrangement portion 100 b increases as it goes from the one end portion 311 to the other end portion 312. Here, the storage element 100a may have a gradient on the outer surface of the container 110 when the container 110 is manufactured by drawing or the like. For this reason, the first spacer 300a is evenly pressed against the power storage element 100a by providing a gradient to the portion of the first spacer 300a that contacts the power storage element 100a, and the first spacer 300a is stacked when the power storage element 100a is stacked. It can suppress shifting from.

  In addition, the first spacer 300a is likely to vary in size on the other end 312 side of the main body 310 having a large width, but the first spacer 300a is provided on the other end 312 side of the main body 310 with the first rib 340. This variation can be absorbed. Thereby, when the electrical storage element 100a is stacked, it can suppress further that it shifts | deviates from the 1st spacer 300a.

  Further, the main rib portion 310 of the first spacer 300a is inclined by giving a gradient to the width of the first rib 340 so that the width of the first rib 340 increases from the one end portion 311 side toward the other end portion 312 side. The variation in the dimension on the other end 312 side can be further absorbed.

  In addition, the first spacer 300a includes the second rib 350 that comes into contact with the corner 113 on the one end 311 side of the power storage element 100a, so that the second rib 350 is brought into contact with the corner 113 of the power storage element 100a. It can be suppressed that the power storage element 100a protrudes from the first spacer 300a toward the one end 311 side.

  Further, at the end on the other end 312 side of the power storage element 100a, the first spacer 300a can firmly hold the power storage element 100a and fix it by the first rib 340 having relatively high rigidity. Further, at the end of the power storage element 100a on the one end 311 side, the second rib 350 having a relatively low rigidity suppresses the corner 113 of the power storage element 100a from being stressed, and the welded portion ( It is possible to suppress damage of the container main body and the lid portion).

  In addition, the second rib 350 is narrower from the one end 311 side to the other end 312 side, so that the power storage element 100a can be easily pressed from the first spacer 300a to the one end 311 side. ing.

  Further, when the power storage element 100a is stacked by being sandwiched between two spacers 300 (first spacer 300a and second spacer 300b) that are widened from the one end 311 to the other end 312 of the power storage element 100a. It is possible to effectively suppress the displacement from the spacer 300.

  Of the above effects, the effects caused by the first spacer 300a are also caused by other spacers 300 such as the second spacer 300b.

(Modification 1)
Next, Modification 1 of the above embodiment will be described. In the above embodiment, the main body 310 of the first spacer 300 a has the side surfaces 313 and 314 that are inclined from the one end 311 toward the other end 312. However, in this modification, the main body portion of the first spacer has a stepped side surface portion.

  FIG. 6 is a cross-sectional view showing the configuration of the main body 310 of the first spacer 300c according to the first modification of the present embodiment.

  As shown in the drawing, the main body part 310 of the first spacer 300c has a stepped side part 315 on the power storage element 100a side. That is, the main body portion 310 of the first spacer 300c has step portions 315a to 315e that gradually spread in the X-axis direction on the side surface portion 315, and comes into contact with the power storage element 100a at the step portions 315a to 315e. Further, the main body portion 310 of the first spacer 300c has a similar step-like side surface portion 315 on the first arrangement portion 100b side, and abuts on the first arrangement portion 100b. Similarly, the other spacers 300 such as the second spacer 300b have stepped side portions. Since other configurations are the same as those in the above embodiment, the description thereof is omitted.

  As a result, in the main body 310, a portion located in the stepped portions 315 a to 315 e from the one end portion 311 to the other end portion 312 is a contact portion between the power storage element 100 a and the first arrangement portion 100 b. The width of the abutting portion in the first direction increases from the one end 311 toward the other end 312.

  As described above, also in the power storage device according to Modification 1 of the present embodiment, the same effect as in the above embodiment can be obtained. The same applies to other spacers 300 such as the second spacer 300b.

(Modification 2)
Next, a second modification of the above embodiment will be described. In this modification, the main body portion of the first spacer has a side surface portion on which a plurality of protrusions are formed.

  FIG. 7 is a cross-sectional view illustrating the configuration of the main body 310 of the first spacer 300d according to the second modification of the present embodiment.

  As shown in the figure, the main body portion 310 of the first spacer 300d has a side surface portion 316 in which a plurality of protrusions are formed on the power storage element 100a side. That is, the main body portion 310 of the first spacer 300d has protrusions 316a to 316e that gradually spread in the X-axis direction on the side surface portion 316, and comes into contact with the power storage element 100a at the protrusions 316a to 316e. Further, the main body part 310 of the first spacer 300d has a side part 316 in which a plurality of similar protrusions are formed on the first arrangement part 100b side, and abuts on the first arrangement part 100b. Similarly, the other spacers 300 such as the second spacer 300b have side portions on which a plurality of protrusions are formed. Since other configurations are the same as those in the above embodiment, the description thereof is omitted.

  As a result, in the main body 310, a portion located in the protrusions 316 a to 316 e and the like from the one end portion 311 to the other end portion 312 serves as a contact portion between the power storage element 100 a and the first arrangement portion 100 b. The width of the abutting portion in the first direction increases from the one end 311 toward the other end 312.

  As described above, also in the power storage device according to Modification 2 of the present embodiment, the same effects as those in the above embodiment can be obtained. The same applies to other spacers 300 such as the second spacer 300b.

  Although the power storage device according to this embodiment and its modification has been described above, the present invention is not limited to the above-described embodiment and its modification. In other words, it should be considered that the embodiment and its modification disclosed this time are illustrative and not restrictive in all respects. 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 embodiment and the modification thereof, the spacer 300 has the first rib 340 on both sides of the main body 310. However, the spacer 300 may have a configuration in which the first rib 340 is provided only on one side of the main body 310. Alternatively, the spacer 300 may not have the first rib 340. The same applies to the second rib 350.

  Moreover, in the said embodiment and its modification, the 1st rib 340 decided that the width | variety in a 1st direction became so large that it went to the direction toward the other end part 312 from the one end part 311. As shown in FIG. However, the first rib 340 may have a constant width in the first direction.

  In the above-described embodiment and its modification, the second rib 350 has a width in the first direction that decreases as it goes in the direction from the one end 311 to the other end 312. However, the second rib 350 may have a constant width in the first direction.

  In the above-described embodiment and its modification, the first rib 340 is made of the same material as the second rib 350 and thicker than the second rib 350, so that the first rib 340 is more rigid than the second rib 350. It was decided that it was high. However, the first rib 340 may be made of a material having a rigidity lower than that of the second rib 350 as long as the first rib 340 has a thickness higher than that of the second rib 350. Alternatively, the first rib 340 may be made of a material having the same thickness as the second rib 350 and having higher rigidity than the second rib 350. In this case, the first rib 340 may be thinner than the second rib 350 as long as the first rib 340 has higher rigidity than the second rib 350.

  In the above-described embodiment and its modification, the first spacer 300 a is the spacer 300 and the first arrangement portion 100 b is the power storage element 100. However, when the clamping member 400 is configured by an inner insulating member (side facing the power storage element 100) and an outer metal member, the first spacer 300a is the inner insulating member, and the first arrangement The part 100b may be an outer metal member. Alternatively, when the clamping member 400 is formed of a single insulating member, the first spacer 300a is the clamping member 400, and the first placement portion 100b is the side of the clamping member 400 such as the side wall of the second exterior body 12. You may decide to be the member arrange | positioned. The same applies to the second spacer 300b and the second arrangement portion 100c. That is, the insulating member inside the clamping member 400 or the clamping member 400 may have a main body portion, a first rib, and a second rib having the same configuration as the spacer 300.

  Moreover, in the said embodiment and its modification, all the spacers 300 had the same shape as the 1st spacer 300a, and all the electrical storage elements 100 decided to have the same shape as the electrical storage element 100a. . However, some of the spacers 300 may have a shape different from that of the first spacer 300a, and some of the energy storage elements 100 may have a shape different from that of the energy storage element 100a.

  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.

  In addition, the present invention can be realized not only as such a power storage device but also as the spacer 300 (the first spacer 300a and the second spacer 300b) included in the power storage device.

  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 1 Power storage device 100, 100a Power storage element 100b First arrangement part 100c Second arrangement part 113 Corner part 300 Spacer 300a, 300c, 300d First spacer 300b Second spacer 310 Main body part 311 One end part 312 Other end part 340 First rib 350 Second rib

Claims (7)

A storage element;
A first spacer disposed in contact with the power storage element on the first direction side of the power storage element;
A first arrangement part arranged in contact with the first spacer on the first direction side of the first spacer;
The first spacer has a main body extending from one end of the second direction intersecting the first direction to the other end.
The power storage device, wherein the width of the main body portion in the first direction of the contact portion between the power storage element and the first arrangement portion increases from the one end portion toward the other end portion. The said 1st spacer is between at least one of the said electrical storage element and said 1st arrangement | positioning part, Comprising: The 1st rib arrange | positioned at the said other end part side of the said main-body part is further provided. Power storage device. The power storage device according to claim 2, wherein the first rib has a width in the first direction that increases in a direction from the one end to the other end. The power storage device according to any one of claims 1 to 3, wherein the first spacer further includes a second rib that contacts a corner portion on the one end portion side of the power storage element. The power storage device according to claim 4, wherein the first rib has higher rigidity than the second rib. The power storage device according to claim 4 or 5, wherein the second rib has a width in the first direction that decreases in a direction from the one end to the other end. further,
A second spacer disposed in contact with the power storage element on the side opposite to the first direction of the power storage element;
On the opposite side of the second spacer from the first direction, the second spacer is disposed in contact with the second spacer,
The second spacer is a main body portion extending from one end portion to the other end portion in the second direction, and a width in the first direction of a contact portion between the power storage element and the second arrangement portion is the one end. The power storage device according to any one of claims 1 to 6, further comprising a main body portion that increases from the first portion toward the other end portion.

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