JP2020107462A - Power storage device - Google Patents

Abstract

To provide a power storage device that can suppress damage to an end plate.SOLUTION: A power storage device 10 including a power storage element 100 includes an end plate 400 arranged at the end of the power storage device 10 on the first direction side, and an end spacer 300 arranged between the power storage element 100 and the end plate 400, and the end spacer 300 has a spacer uneven surface 310a having an uneven shape, which is a surface facing the end plate 400, and the end plate 400 has a plate uneven surface 410a having an uneven shape along the uneven shape of the spacer uneven surface 310a, which is a surface facing the spacer uneven surface 310a.SELECTED DRAWING: Figure 8

Description

The present invention relates to a power storage device including a power storage element and an end plate.

Conventionally, a power storage device including a power storage element and an end plate is widely known. For example, Patent Document 1 discloses a battery module unit (power storage device) including a battery cell (power storage element) and an end plate.

JP, 2005-109176, A

However, in the above-described conventional power storage device, the end plate may be damaged. That is, in the power storage device disclosed in Patent Document 1, since the end plate is a flat member, when the power storage element swells with use, a pressing force is generated toward the end plate, The end plate may be deformed or damaged.

The present invention has been made to solve the above problem, and an object of the present invention is to provide a power storage device capable of suppressing damage to an end plate.

In order to achieve the above object, a power storage device according to one embodiment of the present invention is a power storage device including a power storage element, and an end plate disposed at an end of the power storage device on a first direction side, and the power storage device. A spacer disposed between the element and the end plate, wherein the spacer has a spacer concavo-convex surface having a concavo-convex shape that is a surface facing the end plate, and the end plate is the The plate has an uneven surface which faces the spacer uneven surface and has an uneven shape along the uneven shape of the spacer uneven surface.

According to this, in the power storage device, the spacer between the power storage element and the end plate has the spacer uneven surface on the surface facing the end plate, and the end plate has the plate uneven shape along the uneven shape of the spacer uneven surface. Has a face. In this way, by forming the spacer uneven surface on the spacer and forming the plate uneven surface along the spacer uneven surface on the end plate, the pressing force generated from the spacer toward the end plate is applied to the plate through the spacer uneven surface. Can be received on uneven surfaces. That is, when the storage element swells, the pressing force transmitted from the storage element to the end plate via the spacer is received by the plate uneven surface via the spacer uneven surface, whereby the pressing force transmitted to the end plate can be dispersed. it can. As a result, it is possible to suppress the local application of force to the end plate, and thus it is possible to suppress damage to the end plate.

The surface of the spacer facing the power storage element may have a shape along the surface of the power storage element facing the spacer.

According to this, the surface of the spacer on the side of the electric storage element has a shape along the surface of the electric storage element on the side of the spacer. Thus, by forming the surface of the spacer on the side of the power storage element along the power storage element, the force from the power storage element can be dispersed and transmitted to the spacer. As a result, it is possible to prevent the force applied from the spacer to the end plate from being biased, and thus it is possible to further suppress damage to the end plate.

The spacer uneven surface has a spacer inclined surface inclined with respect to the first direction,
The plate uneven surface may have a plate inclined surface along the spacer inclined surface.

According to this, the spacer uneven surface of the spacer has the spacer inclined surface, and the plate uneven surface of the end plate has the plate inclined surface along the spacer inclined surface. In this way, by forming the spacer inclined surface on the spacer uneven surface and forming the plate inclined surface along the spacer inclined surface on the plate uneven surface, the force is transmitted from the spacer to the end plate via the inclined surface. This makes it possible to further disperse the force applied from the spacer to the end plate, and thus to further suppress damage to the end plate.

Further, at least one of the spacer and the end plate has a protruding portion that projects toward the other and abuts the other, and a gap is formed between the spacer uneven surface and the plate uneven surface. You may decide that it is done.

According to this, a gap is formed between the spacer concave-convex surface and the plate concave-convex surface by the projection of at least one of the spacer and the end plate contacting the other. Thus, even if the spacer is deformed for a certain period after the power storage element starts to swell, the spacer does not come into contact with the end plate, so that it is possible to suppress the force from being applied to the end plate. With this, even when the electricity storage element largely swells, the maximum stress applied from the spacer to the end plate can be reduced, and thus damage to the end plate can be further suppressed.

At least one of the spacer and the end plate has an insulating layer extending in a second direction intersecting with the first direction and a third direction intersecting with the first direction and the second direction. May be.

According to this, since at least one of the spacer and the end plate has the insulating layer, the electric storage element and the end plate can be easily insulated. In this way, damage to the end plate can be suppressed while insulating the power storage element and the end plate.

Further, the end plate has a first plate portion having the plate uneven surface and a second plate portion arranged on the first direction side of the first plate portion, and the second plate portion is , Having a mounting portion that extends in the first direction and is mounted to an external member, and at least one of the second plate portion and the mounting portion is in the third direction intersecting the first direction, It may be arranged at the central position of one plate portion.

According to this, the end plate has the first plate portion having the plate concave-convex surface and the second plate portion having the attachment portion attached to the external member. At least one is arranged at the central position of the first plate portion. In this way, when the second plate portion is arranged at the central position of the first plate portion, the force transmitted from the power storage element to the end plate can be received at the central position of the end plate. Further, when the mounting portion is arranged at the central position of the first plate portion, it is possible to reduce the bending moment applied to the mounting portion, which is a fixed portion to an external member. Since these can suppress the force applied to the end plate, damage to the end plate can be further suppressed.

Further, the end plate is further disposed between the first plate portion and the second plate portion and extends from one end portion to the other end portion of the first plate portion in the third direction. May be included.

According to this, the end plate has the third plate portion extending from one end portion to the other end portion of the first plate portion between the first plate portion and the second plate portion. Therefore, the force applied to the second plate portion can be received from the one end portion to the other end portion of the first plate portion via the third plate portion. Thereby, since the bias of the force applied to the first plate portion can be suppressed, the damage of the end plate can be further suppressed.

Note that the present invention can be realized not only as such a power storage device but also as a spacer and an end plate included in the power storage device.

According to the power storage device of the present invention, damage to the end plate can be suppressed.

FIG. 3 is a perspective view showing an external appearance of the power storage device according to the embodiment. FIG. 3 is an exploded perspective view showing each component when the power storage device according to the embodiment is disassembled. It is a perspective view showing the composition of the electric storage element concerning an embodiment. It is a perspective view which shows the structure of the end spacer which concerns on embodiment. It is a perspective view which shows the structure of the end plate which concerns on embodiment. It is a perspective view which shows the positional relationship of the end spacer and end plate which concern on embodiment. It is sectional drawing which shows the positional relationship of the end spacer and end plate which concern on embodiment. It is sectional drawing which shows the positional relationship of the end spacer and end plate which concern on embodiment.

Hereinafter, a power storage device according to an embodiment (and a modification thereof) of the present invention will be described with reference to the drawings. The embodiment described below shows a comprehensive or specific example. Numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of constituent elements, manufacturing steps, order of manufacturing steps, and the like shown in the following embodiments are examples, and are not intended to limit the present invention. Further, among the constituent elements in the following embodiments, constituent elements not described in the independent claim showing the highest concept are described as arbitrary constituent elements. In addition, the dimensions and the like are not strictly illustrated in each drawing.

Further, in the following description and drawings, the direction in which power storage elements are arranged, the direction in which spacers (intermediate spacers, end spacers) are arranged, the direction in which end plates are arranged, the direction in which power storage elements and spacers and end plates are arranged, and one power storage element The opposing direction of the pair of long side surfaces of the container or the thickness direction of the power storage element, the spacer, or the end plate is defined as the X-axis direction. The direction in which the container body of the power storage element and the lid are arranged or the direction in which the power storage element and the bus bar are arranged is defined as the Y-axis direction. Arrangement direction of a pair of electrode terminals in one storage element, opposing direction of a pair of short side surfaces in a container of one storage element, arrangement direction of side plates, arrangement direction of insulating plates, arrangement direction of side plates and insulating plates, Alternatively, the vertical direction is defined as the Z-axis direction. The X-axis direction, the Y-axis direction, and the Z-axis direction are directions intersecting with each other (orthogonal in the present embodiment). Note that the Z-axis direction may not be the vertical direction depending on the usage mode, but for convenience of description, the Z-axis direction will be described as the vertical direction below. Further, in the following description, for example, the X-axis positive direction indicates the X-axis arrow direction, and the X-axis negative direction indicates the direction opposite to the X-axis positive direction. The same applies to the Y-axis direction and the Z-axis direction. Further, hereinafter, the X-axis direction (or the X-axis plus direction) is also referred to as a first direction, the Y-axis direction is also referred to as a second direction, and the Z-axis direction is also referred to as a third direction.

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

Power storage device 10 is a device that can charge electricity from the outside and discharge electricity to the outside, and has a substantially rectangular parallelepiped shape in the present embodiment. For example, the power storage device 10 is a battery module (assembled battery) used for power storage, power supply, or the like. Specifically, the power storage device 10 is, for example, a vehicle 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, and construction. Used as a battery for driving machines or starting engines for electric vehicles such as trains, electric railroads such as trains, monorails or linear motor cars, or for stationary use for households or generators To be

As shown in FIGS. 1 and 2, a power storage device 10 includes a plurality (16 in this embodiment) of power storage elements 100, a plurality (15 in this embodiment) of intermediate spacers 200, and a pair of ends. It includes a spacer 300, a pair of end plates 400, a pair of insulating plates 600, a pair of side plates 700, and a bus bar 800. Further, an adhesive layer 510 is arranged between the adjacent electric storage elements 100, an adhesive layer 520 is arranged between the electric storage element 100 and the end spacer 300, and an electric connection between the electric storage element 100 and the insulating plate 600. The adhesive layer 530 is arranged. In addition, a pair of external terminals 910 (a positive electrode external terminal and a negative electrode external terminal) that are terminals of the power storage device 10 are arranged in the end spacer 300. Note that the power storage device 10 includes a bus bar frame that holds the bus bar 800, wiring for measuring voltage of the storage element 100, wiring for measuring temperature, a thermistor, a circuit board for monitoring the charging state and discharging state of the storage element 100, and An electric device such as a relay may be provided.

Power storage element 100 is a secondary battery (single battery) capable of charging and discharging electricity, and more specifically, a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. Power storage element 100 has a flat rectangular parallelepiped shape (square shape), has long side faces in the X-axis direction, and has the electrode terminals laid sideways so as to face the Y-axis plus direction in the X-axis direction. They are arranged side by side. In addition, power storage element 100 is arranged adjacent to intermediate spacer 200 or end spacer 300. That is, each of the plurality of power storage elements 100 is alternately arranged with each of the plurality of intermediate spacers 200 and the pair of end spacers 300, and is arranged in the X-axis direction. In the present embodiment, 15 intermediate spacers 200 are arranged between adjacent power storage elements 100 among 16 power storage elements 100, and power storage element 100 at the end of 16 power storage elements 100 is disposed. A pair of end spacers 300 are arranged at positions sandwiching. A detailed description of the configuration of the storage element 100 will be given later.

The number of power storage elements 100 is not particularly limited, and may be a plurality other than 16, or may be 1. The shape of the electricity storage device 100 is not particularly limited, and may be any shape such as a polygonal column shape other than a rectangular parallelepiped shape, a columnar shape, an elliptic column shape, an oval column shape, or a laminate type electricity storage. It can also be an element. Further, power storage element 100 is not limited to the non-aqueous electrolyte secondary battery, and may be a secondary battery other than the non-aqueous electrolyte secondary battery or a capacitor. Further, power storage element 100 may not be a secondary battery, but may be a primary battery that can use stored electricity without a user charging. Further, power storage element 100 may be a battery using a solid electrolyte.

The intermediate spacer 200 and the end spacer 300 are arranged laterally (X-axis positive direction or X-axis negative direction) of the power storage element 100 to insulate the power storage element 100 from other members and prevent the power storage element 100 from swelling. Is a spacer that suppresses The intermediate spacer 200 and the end spacer 300 are, for example, polycarbonate (PC), polypropylene (PP), polyethylene (PE), polyphenylene sulfide resin (PPS), polyethylene terephthalate (PET), polyether ether ketone (PEEK), tetrafluoro. Insulating resin materials such as ethylene perfluoroalkyl vinyl ether (PFA), polytetrafluoroethylene (PTFE), polybutylene terephthalate (PBT), polyether sulfone (PES), ABS resin, and their composite materials Has been formed. The intermediate spacers 200 and the end spacers 300 may be made of a material other than resin as long as they have an insulating property. For example, a ceramic or a dammer formed by integrating and bonding pieces of mica. It may be formed of a mica plate or the like formed of a material. Further, all of the plurality of intermediate spacers 200 and the pair of end spacers 300 do not have to be formed of the same material.

The intermediate spacer 200 is a rectangular and flat plate-shaped spacer disposed between the two adjacent power storage elements 100 at the center position of the power storage element 100 in the Y-axis direction. Here, adhesive layers 510 such as double-sided tapes are arranged on both sides of the intermediate spacer 200 in the Y-axis direction, and the power storage elements 100 on both sides of the intermediate spacer 200 in the X-axis direction are adhered by the adhesive layers 510. Thus, the intermediate spacer 200 is sandwiched between the power storage elements 100 on both sides in the X-axis direction and fixed to the power storage elements 100 on both sides in the X-axis direction. In the present embodiment, 15 intermediate spacers 200 are arranged corresponding to 16 power storage elements 100. However, when the number of power storage elements 100 is other than 16, the number of intermediate spacers 200 is set. Is also changed according to the number of power storage elements 100.

The end spacer 300 is a rectangular and plate-shaped spacer arranged between the power storage element 100 at the end and the end plate 400. Since the end spacer 300 is made of an insulating material as described above, it has a function as an insulating layer that spreads in the Y-axis direction (second direction) and the Z-axis direction (third direction). In addition, the end spacer 300 is a member having higher elastic performance (lower Young's modulus or lower rigidity) than the end plate 400. An adhesive layer 520 such as a double-sided tape is arranged on the power storage element 100 side of the end spacer 300, and the end spacer 300 and the power storage element 100 are bonded by the adhesive layer 520. A detailed description of the configuration of the end spacer 300 will be given later.

The end plate 400 and the side plate 700 are members that press the power storage element 100 from the outside in the direction in which the plurality of power storage elements 100 are arranged (X-axis direction). That is, the end plates 400 and the side plates 700 sandwich the plurality of power storage elements 100 from both sides in the arrangement direction, and thereby press the respective power storage elements 100 included in the plurality of power storage elements 100 from both sides in the arrangement direction.

Specifically, the end plates 400 are arranged on both sides of the plurality of power storage elements 100 in the X-axis direction, and sandwich the plurality of power storage elements 100 from both sides in the arrangement direction (X-axis direction) of the plurality of power storage elements 100. It is a plate-shaped member (also referred to as a sandwiching member) for holding. The end plate 400 is made of, for example, a metal (conductive) material such as stainless steel, iron, plated steel plate, aluminum, and aluminum alloy from the viewpoint of ensuring strength. The material of the end plate 400 is not particularly limited, and may be formed of, for example, an insulating material having high strength or may be subjected to an insulation treatment. A detailed description of the structure of the end plate 400 will be given later.

The side plate 700 is a long and plate-like member (also referred to as a restraint member or a restraint bar), both ends of which are attached to the end plate 400 and restrains the plurality of power storage elements 100. That is, the side plate 700 is arranged so as to extend in the X-axis direction so as to straddle the plurality of power storage elements 100, the plurality of intermediate spacers 200, and the pair of end spacers 300. The binding force is applied in the arrangement direction (X-axis direction). In the present embodiment, two side plates 700 are arranged at positions on both sides of the plurality of power storage elements 100 in the Z-axis direction so as to sandwich the insulating plate 600 with the power storage elements 100. Then, each of the two side plates 700 is attached to the end portions of the two end plates 400 in the Z-axis direction at both end portions in the X-axis direction. As a result, the two side plates 700 sandwich and restrain the plurality of power storage elements 100 and the like from both sides in the X-axis direction and both sides in the Z-axis direction.

The side plate 700 is fixed to the end plate 400 by fixing members 701 such as a plurality of bolts arranged in the Y-axis direction. The attachment of the side plate 700 to the end plate 400 is not limited to fixing with a bolt or the like, and may be fixed (joined) by welding, bonding, riveting, caulking, or the like. The side plate 700 may be made of any material, but from the viewpoint of ensuring strength, for example, it is made of the same material as the end plate 400. Further, the side plate 700 may be a block-shaped or rod-shaped member or the like.

The insulating plate 600 is a long and flat insulating member (insulator) that is arranged on both sides of the plurality of power storage devices 100 in the Z-axis direction and extends in the X-axis direction. That is, the insulating plate 600 is disposed between the plurality of power storage elements 100, the plurality of intermediate spacers 200, and the pair of end spacers 300 and the side plate 700 so as to straddle the plurality of power storage elements 100, the plurality of intermediate spacers 200, and the pair of end spacers 300. And the side plate 700 are insulated. Here, an adhesive layer 530 such as a double-sided tape is arranged between the power storage element 100 and the insulating plate 600, and the power storage element 100 and the insulating plate 600 are bonded by the adhesive layer 530. The insulating plate 600 may be made of any material as long as it has an insulating property. For example, the insulating plate 600 is made of the same material as the intermediate spacer 200 and the end spacer 300. Note that the two insulating plates 600 may be made of different materials.

The bus bar 800 is a conductive plate-shaped member that is arranged 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 the positive electrode terminal and the negative electrode terminal of adjacent power storage elements 100. Further, the bus bar 800 arranged at the end is connected to the positive and negative electrode side external terminals 910. The bus bar 800 is formed of a conductive member made of metal such as aluminum, aluminum alloy, copper, and copper alloy. Note that the connection form of the power storage elements 100 is not particularly limited, and any of the power storage elements 100 may be connected in parallel.

[2 Detailed Description of Storage Element 100]
Next, the configuration of power storage element 100 will be described in detail. FIG. 3 is a perspective view showing the configuration of power storage element 100 according to the present embodiment. Specifically, FIG. 3 is an enlarged perspective view showing a state in which the intermediate spacer 200 and the adhesive layers 510, 520 and 530 are removed from the electricity storage device 100 in FIG. It should be noted that all 16 power storage elements 100 in FIG. 2 have the same configuration, and therefore one power storage element 100 will be described below.

As shown in FIG. 3, the electricity storage device 100 includes a container 110, a pair of electrode terminals 120 (a positive electrode terminal and a negative electrode terminal), and a pair of gaskets 130 (a positive electrode side and a negative electrode side gasket). In addition, an electrode body, a pair of current collectors (a positive electrode current collector and a negative electrode current collector), an electrolytic solution (non-aqueous electrolyte), and the like are housed inside the container 110, but these are not shown. Is omitted. Note that the electrolytic solution is not particularly limited in type as long as it does not impair the performance of the electricity storage device 100, and various electrolytic solutions can be selected. Further, a gasket is also arranged between the container 110 (a lid 112 described later) and the current collector, and spacers are arranged on the sides of the current collector, but these are not shown.

The container 110 is a rectangular parallelepiped (square) container having a container body 111 having an opening formed therein, a lid 112 that closes the opening of the container body 111, and an insulating sheet 113 that covers the outer surface of the container body 111. is there. The container main body 111 is a member having a rectangular tubular shape and forming a bottom, which constitutes the main body of the container 110, and has an opening formed on the Y axis plus direction side. The lid body 112 is a rectangular plate-shaped member that constitutes the lid portion of the container 110, and is arranged so as to extend in the Z axis direction on the Y axis plus direction side of the container body 111. The lid 112 has a gas discharge valve 112a that releases the pressure inside the container 110 when the pressure inside the container 110 rises, and a liquid injection section (not shown) for injecting an electrolytic solution into the inside of the container 110. Etc. are provided. The material of the container body 111 and the lid 112 is not particularly limited, but is preferably a weldable metal such as stainless steel, aluminum, aluminum alloy, iron, plated steel plate.

The insulating sheet 113 is an insulating sheet-like member that is disposed on the outer surface of the container body 111 and covers the outer surface of the container body 111. The material of the insulating sheet 113 is not particularly limited as long as it can ensure the insulation required for the electricity storage device 100, but 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), silicone, polyisoprene, and polyvinyl chloride.

Thus, the electrode body and the like are housed inside the container body 111, the container body 111 and the lid body 112 are joined by welding or the like to seal the inside, and the insulating sheet 113 is arranged on the outer surface of the container body 111. Thus, the container 110 is formed. As a result, the container 110 has a pair of long side surface portions 110a on both side surfaces in the X axis direction, a pair of short side surface portions 110b on both side surfaces in the Z axis direction, and a bottom surface portion 110c on the Y axis negative direction side. It is configured to have. The long side surface portion 110a is a rectangular flat surface portion that forms the long side surface of the container 110, the short side surface portion 110b is a rectangular flat surface portion that forms the short side surface of the container 110, and the bottom surface portion 110c is the container. It is a rectangular flat portion that forms the bottom surface of 110. In the present embodiment, the insulating sheet 113 is arranged on all of the pair of long side surface portions 110a, the pair of short side surface portions 110b and the bottom surface portion 110c, but is not arranged on the bottom surface portion 110c. The configuration may not be arranged on any of the surface portions.

The electrode terminal 120 is a terminal (a positive electrode terminal and a negative electrode terminal) of the electricity storage device 100 arranged on the lid 112, and is electrically connected to the positive electrode plate and the negative electrode plate of the electrode body via a current collector. .. That is, the electrode terminal 120 is a metal for leading the electricity stored in the electrode body to the external space of the power storage element 100, and for introducing the electricity to the internal space of the power storage element 100 to store the electricity in the electrode body. It is a member made of. The electrode terminal 120 is formed of aluminum, aluminum alloy, copper, copper alloy, or the like. The gasket 130 is a member arranged around the electrode terminal 120 and between the electrode terminal 120 and the lid 112, and is a member for ensuring insulation and airtightness between the electrode terminal 120 and the lid 112. .. The gasket 130 is formed of an insulating material such as PP, PE, PPS, PET, PEEK, PFA, PTFE, PBT, PES, or ABS resin.

The electrode body is a power storage element (power generation element) formed by stacking a positive electrode plate, a negative electrode plate, and a separator. Here, the positive electrode plate included in the electrode body is one in which the positive electrode active material layer is formed on the positive electrode base material layer, which is a long strip current collector foil made of a metal such as aluminum or an aluminum alloy. Further, the negative electrode plate is one in which a negative electrode active material layer is formed on a negative electrode base material layer which is a long strip current collector foil made of a metal such as copper or a copper alloy. As the positive electrode active material used for the positive electrode active material layer and the negative electrode active material used for the negative electrode active material layer, any known material can be used as long as it can store and release lithium ions. Further, the current collector is a member (positive electrode current collector and negative electrode current collector) having electrical conductivity and rigidity that is electrically connected to the electrode terminal 120 and the electrode body. Note that the positive electrode current collector is formed of aluminum or an aluminum alloy as in the positive electrode substrate layer of the positive electrode plate, and the negative electrode current collector is formed of copper or copper alloy as in the negative electrode substrate layer of the negative electrode plate. Has been done.

[Detailed Description of 3 End Spacer 300]
Next, the structure of the end spacer 300 will be described in detail. FIG. 4 is a perspective view showing the structure of the end spacer 300 according to this embodiment. Specifically, FIG. 4 is a perspective view showing the end spacer 300 on the X-axis plus direction side in FIG. 2 together with the terminal member 900 having the external terminal 910. In FIG. 2, since the end spacer 300 on the X-axis positive direction side and the end spacer 300 on the X-axis negative direction side have symmetrical shapes with respect to the YZ plane, the end spacer on the X-axis negative direction side. A description of the spacer 300 will be omitted.

As shown in FIG. 4, the end spacer 300 has a spacer body 310, a terminal block 320, and a spacer protrusion 330. The spacer main body portion 310 is a plate-shaped portion that constitutes the main body portion of the end spacer 300, has a spacer uneven surface 310a having an uneven shape on the X-axis positive direction side surface, and has an X-axis negative direction side surface. It has a flat (planar) spacer flat surface 310b.

Here, the spacer body 310 has a spacer convex portion 311, a spacer concave portion 312, and a spacer inclined portion 313. The spacer protrusion 311 is a protrusion of the spacer body 310 that protrudes in the X-axis plus direction, and has an end on the Z-axis plus direction side, an end on the Z-axis minus direction side, and Three spacer protrusions 311 located at the central portion in the Z-axis direction are arranged so as to extend in the Y-axis direction. The spacer concave portion 312 is a concave portion of the spacer main body portion 310 that is concave in the negative direction of the X-axis, and two spacer concave portions that are located between two adjacent spacer convex portions 311 of the three spacer convex portions 311. 312 are arranged so as to extend in the Y-axis direction. The spacer inclined portion 313 is a portion having a shape gently inclined from the spacer convex portion 311 toward the spacer concave portion 312, and the four spacer inclined portions 313 located between the spacer convex portion 311 and the spacer concave portion 312 are respectively formed. , Y-axis direction.

Specifically, the spacer protrusion 311 is formed with a plurality of recesses 311a that are recessed in the negative direction of the X-axis and arranged in the Y-axis direction, thereby extending in the Y-axis direction or the Z-axis direction, Moreover, it has a shape in which a plurality of ribs 311b arranged in the Y-axis direction are provided. A spacer convex surface 311c is formed by arranging the tip surfaces (surfaces on the X-axis plus direction side) of the plurality of ribs 311b. That is, the spacer convex surface 311c is a surface of the spacer convex portion 311 on the X axis plus direction side, and is a plane parallel to the YZ plane in which a plurality of holes are formed.

Similarly, the spacer recess 312 is formed with a plurality of recesses 312a that are recessed in the X-axis negative direction and are aligned in the Y-axis direction and the Z-axis direction, and thereby extend in the Y-axis direction or the Z-axis direction. In addition, a plurality of ribs 312b arranged in the Y-axis direction are provided. A spacer concave surface 312c is formed by arranging the tip surfaces (surfaces on the X-axis plus direction side) of the plurality of ribs 312b. That is, the spacer concave surface 312c is a surface of the spacer concave portion 312 on the X axis plus direction side, and is a plane parallel to the YZ plane in which a plurality of holes are formed.

The spacer inclined portion 313 is a portion that connects the spacer convex portion 311 and the spacer concave portion 312. That is, in the spacer inclined portion 313, the end on the Z axis positive direction side is connected to the spacer convex portion 311 and the end on the Z axis negative direction side is connected to the spacer concave portion 312, so that the convex portion gradually changes to the concave portion. It has an inclined shape. Thereby, the spacer inclined portion 313 has a spacer inclined surface 313a connecting the spacer convex surface 311c and the spacer concave surface 312c. That is, the spacer inclined surface 313a is a surface on the X axis plus direction side of the spacer inclined portion 313, and is an inclined surface inclined with respect to the X axis direction (first direction) in which a plurality of holes are formed. Specifically, the spacer inclined surface 313a is an inclined surface inclined from the X-axis direction to the Z-axis positive direction or the Z-axis negative direction.

As described above, the spacer uneven surface 310a has the spacer convex surface 311c, the spacer concave surface 312c, and the spacer inclined surface 313a, whereby the spacer uneven surface 310a has a wavy shape that is wavy in the Z-axis direction. doing.

Further, the spacer main body 310 further has two spacer-side fitting portions 314 arranged in the Y-axis direction. The spacer-side fitting portion 314 is a cylindrical portion that protrudes from the spacer uneven surface 310a toward the X-axis plus direction side, and is inserted and fitted in a through hole 412a formed in the end plate 400, which will be described later. The end spacer 300 is fixed to the end plate 400.

The terminal block 320 is a pedestal part provided at the end of the end spacer 300 on the Y axis plus direction side and on which the external terminal 910 is arranged. In the present embodiment, the terminal member 900 having the external terminal 910 and the bus bar 920 connected to the power storage element 100 is insert-molded on the terminal block 320 to be integrally formed with the terminal block 320.

The spacer protrusion 330 is housed in a recess formed in the spacer uneven surface 310a of the spacer body 310, and a part of the spacer protrusion 330 on the X axis plus direction side is arranged to protrude from the spacer uneven surface 310a in the X axis plus direction. It is a cylindrical member (see FIG. 7). Specifically, the spacer protrusion 330 is a collar to which the fixing member 701 is fastened and which fixes the side plate 700 to the end spacer 300 and the end plate 400. In the present embodiment, three spacer protrusions 330 are arranged side by side in the Y-axis direction on each of the Z-axis positive direction side and the Z-axis negative direction side end of the spacer body 310.

The shape of the spacer protrusion 330 is not particularly limited, and may be any shape such as an elliptical shape, an elliptical shape, a polygonal shape, or another cylindrical shape or a pillar shape when viewed from the X-axis plus direction. The number of spacer protrusions 330 is also not limited. Further, the spacer protruding portion 330 may be not a collar but a protruding portion in which a part of the spacer main body 310 protrudes from the spacer uneven surface 310a in the X axis plus direction, or is provided on the end plate 400. May be. That is, at least one of the end spacer 300 and the end plate 400 may have a protrusion that protrudes toward the other and abuts against the other.

[Detailed Description of 4 End Plate 400]
Next, the configuration of the end plate 400 will be described in detail. FIG. 5 is a perspective view showing the configuration of the end plate 400 according to this embodiment. Specifically, FIG. 5 is an exploded perspective view showing the end plate 400 on the X-axis plus direction side in FIG. 2 in an exploded manner. Note that, in FIG. 2, since the end plate 400 on the X-axis positive direction side and the end plate 400 on the X-axis negative direction side have the same configuration, the description of the end plate 400 on the X-axis negative direction side will be given. Is omitted.

As shown in FIG. 5, the end plate 400 has a first plate portion 410, a second plate portion 420, and a third plate portion 430. The first plate portion 410 is a corrugated member arranged on the X-axis plus direction side (first direction side) of the end spacer 300. The second plate portion 420 is a plate-shaped member arranged on the X axis plus direction side (first direction side) of the first plate portion 410. The third plate portion 430 is a flat plate-shaped member arranged between the first plate portion 410 and the second plate portion 420 in the X-axis direction. That is, the third plate portion 430 is arranged on the X axis plus direction side of the first plate portion 410, and the second plate portion 420 is arranged on the X axis plus direction side of the third plate portion 430.

Specifically, the first plate portion 410 has a plate concave portion 411, a plate convex portion 412, and a plate inclined portion 413. The plate recessed portion 411 is a recessed portion of the first plate portion 410 that is recessed in the X-axis positive direction, and includes an end portion on the Z-axis positive direction side, an end portion on the Z-axis negative direction side of the first plate portion 410, and Three plate recesses 411 located at the central portion in the Z-axis direction are arranged so as to extend in the Y-axis direction. The plate convex portion 412 is a convex portion of the first plate portion 410 that protrudes in the negative direction of the X axis, and two plates located between two adjacent plate concave portions 411 of the three plate concave portions 411. The convex portion 412 is arranged so as to extend in the Y-axis direction. The plate inclined portion 413 is a portion having a shape gently inclined from the plate concave portion 411 toward the plate convex portion 412, and the four plate inclined portions 413 located between the plate concave portion 411 and the plate convex portion 412 are provided. , Y-axis direction.

Further, in the plate concave portion 411 at the end portion on the Z axis plus direction side, three openings 411a into which the three spacer protrusions 330 arranged on the Z axis plus direction side of the end spacer 300 are inserted are formed. .. Similarly, the plate recess 411 at the end on the Z-axis negative direction side is provided with three openings 411a into which the three spacer protrusions 330 arranged on the Z-axis negative direction side of the end spacer 300 are inserted. There is. Further, the plate convex portion 412 on the Z axis plus direction side is formed with two through holes 412a into which the two spacer side fitting portions 314 of the end spacer 300 are inserted and fitted.

The third plate portion 430 extends from one end portion of the first plate portion 410 to the other end portion in the Z-axis direction (third direction), and also in the Y-axis direction, one end portion of the first plate portion 410. Is a rectangular and flat plate-shaped member that is extended from the other end to the other end. In the third plate portion 430, three through holes 431 into which the fixing member 701 is inserted are formed at each of the Z-axis positive direction side end and the Z-axis negative direction side end. Further, the third plate portion 430 is formed with two through holes 432 for preventing interference with the two spacer side fitting portions 314.

The second plate part 420 is arranged at the center position of the first plate part 410 (that is, the center position of the third plate part 430) in the Z-axis direction (third direction), and in the Y-axis direction, the third plate part 420. It is a plate-like member that is arranged so as to extend from one end to the other end of the portion 430. Here, the second plate portion 420 is installed in the central position of the third plate portion 430, and extends from the second plate body portion 421 in the X-axis direction (first direction), and And an attachment portion 422 attached to the member of FIG. The second plate body portion 421 is a rectangular and flat plate portion that is parallel to the YZ plane and elongated in the Y-axis direction. The mounting portion 422 is a rectangular and flat plate portion that is parallel to the XY plane and elongated in the Y-axis direction. That is, the mounting portion 422 has a shape that is bent from the second plate body portion 421 in the X-axis direction. Further, the attachment portion 422 is formed with three through holes 422a which are used when attached to an external member and are arranged in the Y-axis direction.

[5 Description of Positional Relationship between End Spacer 300 and End Plate 400]
Next, the positional relationship between the end spacer 300 and the end plate 400 will be described in detail. FIG. 6 is a perspective view showing a positional relationship between the end spacer 300 and the end plate 400 according to this embodiment. Specifically, FIG. 6 is a perspective view showing a configuration when the end spacer 300 and the end plate 400 on the X axis plus direction side in FIG. 2 are assembled. 7 and 8 are cross-sectional views showing the positional relationship between the end spacer 300 and the end plate 400 according to this embodiment. Specifically, FIG. 7 is a cross-sectional view showing a configuration when the configuration of FIG. 6 is cut along the VII-VII section, and FIG. 8 is a configuration when the configuration of FIG. 6 is cut along the VIII-VIII section. It is sectional drawing which shows. Further, in FIGS. 7 and 8, the position of the storage element 100 is shown by a broken line. The configuration on the negative side of the X axis in FIG.

As shown in these drawings, the end spacer 300 is arranged on the X-axis positive direction side (first direction side) of the power storage element 100, and the end plate 400 is the X-axis positive direction side (first direction) of the end spacer 300. Side). That is, the end plate 400 is arranged at the end of the power storage device 10 on the X-axis positive direction side (first direction side), and the end spacer 300 is arranged between the power storage element 100 and the end plate 400.

With such a configuration, the spacer uneven surface 310a of the end spacer 300 is arranged to face the first plate portion 410 of the end plate 400. That is, the first plate portion 410 has a plate uneven surface 410a which is a surface facing the spacer uneven surface 310a and has an uneven shape along the uneven shape of the spacer uneven surface 310a. Specifically, the plate concave-convex surface 410a has a plate concave surface 411b, a plate convex surface 412b, and a plate inclined surface 413a, whereby the plate concave-convex surface 410a has a wavy waveform shape in the Z-axis direction. Have

The plate concave surface 411b is a surface on the X-axis negative direction side of the plate concave portion 411 of the first plate portion 410, and is a plane parallel to the YZ plane along the spacer convex surface 311c. The plate convex surface 412b is a surface on the X-axis negative direction side of the plate convex portion 412, and is a plane parallel to the YZ plane along the spacer concave surface 312c. The plate inclined surface 413a is a surface of the plate inclined portion 413 on the X axis negative direction side, and is an inclined surface along the spacer inclined surface 313a. The spacer inclined surface 313a and the plate inclined surface 413a are preferably inclined at an angle of 15° or more and 75° or less with respect to the X-axis direction, and are inclined at an angle of 30° or more and 60° or less. Is more preferable, and it is further preferable that the inclination is at an angle of 40° or more and 50° or less.

Further, the spacer protrusion 330 is disposed in contact with the end plate 400, so that a gap is formed between the spacer uneven surface 310a and the plate uneven surface 410a. Specifically, the spacer protrusion 330 penetrates through the opening 411 a formed in the first plate portion 410 of the end plate 400 and is arranged in contact with the third plate portion 430. A gap is formed between the spacer convex surface 311c, the spacer concave surface 312c and the spacer inclined surface 313a and the plate concave surface 411b, the plate convex surface 412b and the plate inclined surface 413a.

The flat spacer surface 310b of the end spacer 300 is arranged so as to face the electricity storage device 100. That is, the spacer flat surface 310b has a shape that is a surface of the end spacer 300 that faces the power storage element 100 and that follows the surface of the power storage element 100 that faces the end spacer 300. As a result, the spacer flat surface 310b is bonded to the power storage device 100 by the adhesive layer 520. In the present embodiment, in electric storage element 100, since long side surface portion 110a of container 110 is a flat surface, end spacer 300 has a flat spacer flat surface 310b, but end spacer 300 is It suffices to have a surface having a shape corresponding to the shape of the container 110. That is, when the long side surface portion 110a of the power storage element 100 is not a flat surface but a curved surface, the end spacer 300 may have a curved surface along the long side surface portion 110a on the power storage element 100 side.

Since the second plate portion 420 is arranged at the center position of the first plate portion 410 in the Z-axis direction, the mounting portion 422 is also arranged at the center position of the first plate portion 410. Here, the central position of the first plate portion 410 is, for example, a position corresponding to three central portions when the first plate portion 410 is divided into five in the Z-axis direction. With this configuration, both end portions of the end plate 400 in the Z-axis direction are supported by the first plate portion 410, and the central portion in the Z-axis direction is supported by the second plate portion 420. This is about ⅔ of the case where the Z-axis direction end portion of is supported by the second plate portion 420. Accordingly, it is possible to suppress an increase in the plate thickness of the end plate 400. In this way, at least one of the second plate portion 420 and the attachment portion 422 is arranged at the center position of the first plate portion 410 in the Z-axis direction (third direction).

In addition, it is more preferable that the central position of the first plate portion 410 is a position corresponding to the two central portions when the first plate portion 410 is divided into four. In this case, the generated stress is about 1/2 of that in the case where the end portion 400 of the end plate 400 in the Z-axis direction is supported by the second plate portion 420. Further, it is more preferable to set it at a position corresponding to the central portion when the first plate portion 410 is divided into three parts. In this case, the generated stress is about 1/3 of that in the case where the Z-axis direction end portion of the end plate 400 is supported by the second plate portion 420.

[6 Description of effects]
As described above, according to power storage device 10 of the present embodiment, end spacer 300 has spacer uneven surface 310a on the surface facing end plate 400, and end plate 400 has uneven surface of spacer uneven surface 310a. It has a plate uneven surface 410a that conforms to the shape. Thus, by forming the spacer uneven surface 310a on the end spacer 300 and the plate uneven surface 410a on the end plate 400, the pressing force generated from the end spacer 300 toward the end plate 400 can be reduced by the spacer uneven surface 310a. It can be received by the plate uneven surface 410a. That is, when the power storage element 100 swells, the pressing force transmitted from the power storage element 100 to the end plate 400 via the end spacer 300 is received by the plate uneven surface 410a via the spacer uneven surface 310a. The transmitted pressing force can be dispersed. As a result, it is possible to suppress the local application of force to the end plate 400, and thus it is possible to suppress damage to the end plate 400. If the damage to the end plate 400 can be suppressed, the increase in the plate thickness of the end plate 400 can be suppressed, so that the weight and the space can be saved.

The surface of the end spacer 300 on the power storage element 100 side has a shape along the surface of the power storage element 100 on the end spacer 300 side. As described above, by forming the surface of the end spacer 300 on the side of the power storage element 100 along the shape of the power storage element 100, the force from the power storage element 100 can be dispersed and transmitted to the end spacer 300. This can prevent the force applied from the end spacer 300 to the end plate 400 from being biased, so that the damage to the end plate 400 can be further suppressed. Specifically, it is as follows.

In the power storage device 10, by forming the spacer uneven surface 310a on the end spacer 300 and the plate uneven surface 410a on the end plate 400, the pressing force generated from the end spacer 300 toward the end plate 400 is reduced. It can be received by the uneven surface 410a of the plate via 310a. Thereby, the pressing force transmitted to the end plate 400 can be dispersed. Here, in order to disperse and transmit the pressing force generated by the swelling of the storage element 100 to the end plate 400, at the time when the pressing force is transmitted to the end spacer 300, which is an intermediate inclusion, It is desirable that the load be distributed as much as possible.

Conventionally, the shape of the long side surface of a power storage element is various, such as one that is generally recessed due to manufacturing variations, one that is substantially flat, and one that is entirely swollen, and absorbs variations in these dimensions and shapes. For this reason, there is an end spacer provided with a crushing rib. However, as the energy density is required to be improved, the tendency to pack the electrode body in the power storage element is strengthened, and most of the recent long side surfaces of the power storage element tend to be generally flat to bulge. In such a case, when the end spacer provided with the crushing rib is used, the pressing force is concentrated on the rib portion even under normal conditions, and if the electricity storage element swells, the tendency becomes even stronger. That is, when the pressing force generated by the swelling of the power storage element is transmitted to the end spacer, the pressing force concentrates on the portion where the crushing rib is installed, and it is difficult to disperse the pressing force.

Further, there is also a mode in which an end spacer having a structure in which a ventilation passage is provided is used to send cooling air to the storage element. In such a configuration, the pressing force generated when the power storage element swells is first consumed by crushing the ventilation passage provided between the power storage element and the end spacer. That is, the tendency of the pressing force to be dispersed depends on the shape of the ventilation passage, and the structure is not necessarily optimized in terms of the transmission of the pressing force.

That is, in order to disperse the pressing force to the end spacers 300 as much as possible, the surface of the end spacer 300 on the side of the power storage element 100 has a shape along the surface of the power storage element 100 on the side of the end spacer 300. Is most desirable. As a result, the pressing force generated by the swelling of the power storage element 100 becomes a dispersed load at the time of being transmitted to the end spacer 300 that is an intermediate inclusion, and the pressing force is applied to the plate uneven surface 410a via the spacer uneven surface 310a. Can be transmitted in a more distributed manner.

Further, the spacer uneven surface 310a of the end spacer 300 has a spacer inclined surface 313a, and the plate uneven surface 410a of the end plate 400 has a plate inclined surface 413a along the spacer inclined surface 313a. In this way, by forming the spacer inclined surface 313a on the spacer uneven surface 310a and forming the plate inclined surface 413a on the plate uneven surface 410a along the spacer inclined surface 313a, the inclined surface from the end spacer 300 to the end plate 400 is formed. Power is transmitted through. As a result, the force applied from the end spacer 300 to the end plate 400 can be further dispersed, so that damage to the end plate 400 can be further suppressed.

Specifically, it is as follows. Since the end spacer 300 has the spacer uneven surface 310a and the end plate 400 has the plate uneven surface 410a, the contact area between the end spacer 300 and the end plate 400 increases, and the pressing force per unit area decreases. To do. As a result, the force applied to the end plate 400 can be more dispersedly received, and damage to the end plate 400 can be further suppressed. Further, since the spacer uneven surface 310a has the spacer inclined surface 313a and the plate uneven surface 410a has the plate inclined surface 413a, the inclined surface is formed against the pressing force input in the horizontal direction from the end spacer 300. It is possible to generate a component force along it. Thereby, the pressing force as a horizontal component force acting on the end plate 400 can be further reduced, and damage to the end plate 400 can be further suppressed.

In addition, a protrusion is formed between at least one of the end spacer 300 and the end plate 400 (spacer protrusion 330), so that a gap is formed between the spacer uneven surface 310a and the plate uneven surface 410a. There is. In this way, since the end spacer 300 does not come into contact with the end plate 400 even when the end spacer 300 is deformed for a certain period after the power storage element 100 starts to swell, it is possible to suppress the force from being applied to the end plate 400. it can. As a result, even when the electricity storage device 100 is largely swollen, the maximum stress applied from the end spacer 300 to the end plate 400 can be reduced, and thus damage to the end plate 400 can be further suppressed.

Specifically, it is as follows. When the end spacer 300 and the end plate 400 are in contact with each other from the beginning, the load is transmitted to the end plate 400 immediately after the power storage element 100 starts to swell, so that the swelling amount of the power storage element 100 pushes the end plate 400. Converted into power. On the other hand, if a constant gap is formed between the end spacer 300 and the end plate 400, when the power storage element 100 starts to swell, it is consumed by crushing the gap, and thus is transmitted to the end plate 400 as a load. There is no such thing. Then, when the gap is crushed and the end spacer 300 and the end plate 400 start to contact each other, the load is transmitted to the end plate 400 as a load. That is, when comparing the same amount of swelling of the power storage element 100, the end plate 400 is more likely to be formed when a certain gap is formed than when the end spacer 300 and the end plate 400 are in contact with each other from the beginning. It is possible to reduce the maximum load. Thereby, damage to the end plate 400 can be further suppressed.

In addition, at least one of the end spacer 300 and the end plate 400 has an insulating layer (in this embodiment, the end spacer 300 functions as an insulating layer), so that the power storage element 100 and the end plate 400 can be easily formed. Can be insulated. In this way, damage to the end plate 400 can be suppressed while insulating the power storage element 100 and the end plate 400. Further, since it is not necessary to dispose another insulating layer between the power storage element 100 and the end plate 400, it is possible to reduce the weight and save the space.

Further, the end plate 400 includes a first plate portion 410 having a plate uneven surface 410a and a second plate portion 420 having an attachment portion 422 attached to an external member. At least one of the mounting portions 422 is arranged at the central position of the first plate portion 410. Thus, when the second plate portion 420 is arranged at the central position of the first plate portion 410, the force transmitted from the power storage element 100 to the end plate 400 can be received at the central position of the end plate 400. Further, when the mounting portion 422 is arranged at the central position of the first plate portion 410, it is possible to reduce the bending moment applied to the mounting portion 422 that is a fixed portion with an external member. Since these can suppress the force applied to the end plate 400, damage to the end plate 400 can be further suppressed.

Further, the end plate 400 has a third plate portion 430 between the first plate portion 410 and the second plate portion 420 and extending from one end portion to the other end portion of the first plate portion 410. Therefore, the force applied to the second plate portion 420 can be received from the one end portion to the other end portion of the first plate portion 410 via the third plate portion 430. Thereby, the bias of the force applied to the first plate portion 410 can be suppressed, and thus the damage of the end plate 400 can be further suppressed.

[7 Description of Modification]
Although the power storage device 10 according to the present embodiment has been described above, the present invention is not limited to the above embodiments. That is, the embodiment disclosed this time is illustrative and non-restrictive in all respects, and the scope of the present invention is shown by the scope of claims and within the meaning and scope equivalent to the scope of claims. Includes all changes in.

For example, in the above-described embodiment, the spacer uneven surface 310a of the end spacer 300 has a wavy shape. However, the spacer concave-convex surface 310a may have the spacer convex surface 311c and the spacer concave surface 312c of any shape, and the spacer inclined surface 313a inclined in any direction. May be included. The spacer uneven surface 310a may have an uneven shape that does not have the spacer inclined surface 313a, that is, does not have an inclined surface.

Further, in the above-described embodiment, the end spacer 300 has a shape in which the surface facing the power storage element 100 has a shape along the surface facing the end spacer 300 of the power storage element 100. However, the shape of the surface of the end spacer 300 facing the power storage element 100 is not limited to the above, and may have an inclined surface or an uneven surface, for example.

Further, in the above-described embodiment, the projections of at least one of the end spacer 300 and the end plate 400 contact the other, thereby forming a gap between the spacer uneven surface 310a and the plate uneven surface 410a. did. However, the end spacer 300 and the end plate 400 do not have the protrusion, and the spacer uneven surface 310a and the plate uneven surface 410a may be arranged in contact with each other. Further, although the protrusion is provided, the spacer uneven surface 310a and the plate uneven surface 410a may be arranged in contact with each other.

Further, in the above-described embodiment, the end spacer 300 is an insulating layer that spreads in the Y-axis direction (second direction) and the Z-axis direction (third direction). However, it is sufficient that at least one of the end spacer 300 and the end plate 400 has an insulating layer extending in the second direction and the third direction. For example, an insulating layer may be arranged on the surface or inside of the end spacer 300 or the end plate 400, or the end plate 400 may be formed of an insulating member.

Further, in the above-described embodiment, the end plate 400 is made up of three members, that is, the first plate portion 410, the second plate portion 420, and the third plate portion 430. However, the end plate 400 may be composed of a plurality of members other than the three members, or may be composed of only the first plate portion 410.

Further, in the above embodiment, in the end plate 400, at least one of the second plate portion 420 and the attachment portion 422 is arranged at the central position of the first plate portion 410. However, both the second plate portion 420 and the mounting portion 422 may be arranged at the end of the first plate portion 410.

Further, in the above-described embodiment, both the X-axis positive direction side and the X-axis negative direction side of the power storage device 10 have the above configuration, but the X-axis positive direction side and the X-axis direction of the power storage device 10 are described. Either one of the minus side of the shaft may have a configuration different from the above.

Further, a form constructed by arbitrarily combining the constituent elements of the above-described embodiment and its modification is also included in the scope of the present invention.

The present invention can be realized not only as such a power storage device 10 but also as an end spacer 300 and an end plate 400 included in the power storage device 10.

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

10 electricity storage device 100 electricity storage element 110 container 110a long side surface portion 300 end spacer 310 spacer body portion 310a spacer uneven surface 310b spacer flat surface 311 spacer convex portion 311c spacer convex surface 312 spacer concave portion 312c spacer concave surface 313 spacer inclined portion 313a spacer inclined surface 330 spacer Projection part 400 End plate 410 First plate part 410a Plate uneven surface 411 Plate concave part 411b Plate concave surface 412 Plate convex part 412b Plate convex surface 413 Plate inclined part 413a Plate inclined surface 420 Second plate part 422 Mounting part 430 Third plate part

Claims (7)

A power storage device including a power storage element,
An end plate arranged at an end portion on the first direction side of the power storage device,
A spacer disposed between the electric storage element and the end plate,
The spacer is a surface facing the end plate, and has a spacer uneven surface having an uneven shape,
The power storage device has an end plate that is a surface facing the spacer uneven surface, and has a plate uneven surface having an uneven shape along the uneven shape of the spacer uneven surface. The power storage device according to claim 1, wherein a surface of the spacer facing the power storage element has a shape along a surface of the power storage element facing the spacer. The spacer uneven surface has a spacer inclined surface inclined with respect to the first direction,
The power storage device according to claim 1, wherein the plate uneven surface has a plate inclined surface along the spacer inclined surface. At least one of the spacer and the end plate has a protrusion that protrudes toward the other and abuts the other,
The power storage device according to claim 1, wherein a gap is formed between the uneven surface of the spacer and the uneven surface of the plate. At least one of the spacer and the end plate has an insulating layer extending in a second direction intersecting with the first direction and a third direction intersecting with the first direction and the second direction. The power storage device according to any one of 4 above. The end plate is
A first plate portion having the plate uneven surface,
A second plate portion arranged on the first direction side of the first plate portion,
The second plate portion has an attachment portion that extends in the first direction and is attached to an external member,
At least 1 side of the said 2nd plate part and the said attachment part is arrange|positioned at the center position of the said 1st plate part in the 3rd direction which intersects the said 1st direction. Power storage device. The end plate further includes
The electricity storage device according to claim 6, further comprising a third plate portion that is disposed between the first plate portion and the second plate portion and that extends from one end portion to the other end portion of the first plate portion in the third direction. apparatus.

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