JP2019061893A - Power storage element - Google Patents

Abstract

To provide a power storage element capable of suppressing damage to a connection portion between an electrode body and a current collector.SOLUTION: In a power storage element 10 including a container 100, an electrode body 400, a positive electrode current collector 700 connected to the electrode body 400, and a spacer 500 disposed on the side of the positive electrode current collector 700, the electrode body 400 includes one or more connection portions connected to the positive electrode current collector 700, and the one or more connection portions include an end connection portion arranged at the most end, and the spacer 500 includes a projection portion disposed between the container 100 and the end connection portion and projecting towards the end connection portion.SELECTED DRAWING: Figure 6

Description

  The present invention relates to an electric storage device provided with an electrode body and a current collector.

  2. Description of the Related Art Conventionally, a storage element having a configuration in which an electrode body and a current collector are provided and the current collector is connected to the electrode body is widely known. For example, Patent Document 1 discloses an electricity storage element that includes an electrode body and a current collection bar (current collector), and the current collection bar has a wing portion joined to the electrode sheet of the electrode body.

JP 2003-249423 A

  However, in the case where the current collector is connected to the electrode as in the conventional storage element, the connection between the electrode and the current collector may be damaged by an external impact or the like. .

  This invention is made in view of the said subject, and it aims at providing the electrical storage element which can suppress that the connection part with the collector of an electrode body is damaged.

  In order to achieve the above object, a storage element according to an aspect of the present invention includes a container, one or more electrode bodies, a current collector connected to the one or more electrode bodies, and a side of the current collector. Storage element, and the one or more electrode bodies have one or more connection parts connected to the current collector, and the one or more connection parts are the most end. The spacer has an end connection portion disposed in the portion, and the spacer is disposed between the container and the end connection portion, and has a protrusion projecting toward the end connection portion.

  According to this, in the storage element, the electrode body has the endmost connection portion arranged at the end of one or more connection portions connected to the current collector, and the spacer is the container and the electrode body And a projecting portion which is disposed between the endmost connection and the endmost connection. Here, the endmost connection portion of the electrode body is disposed in the vicinity of the container, but in the case where the container is dented by an external impact or the like, the endmost connection portion is pressed against the container There is a risk of damage. For this purpose, the projection of the spacer is arranged between the container and the endmost connection of the electrode body. Thus, the projection of the spacer serves as a buffer material against external impact and the like, and damage to the endmost connection portion of the electrode body can be suppressed. In addition, by filling the gap between the container and the endmost connection portion with the projection of the spacer, it is possible to suppress the movement and damage of the endmost connection portion due to external vibration or impact.

  Further, the one or more electrode bodies are a plurality of electrode bodies in which a positive electrode plate and a negative electrode plate are stacked, and the endmost connection portion is an electrode disposed at the most end of the plurality of electrode bodies. The positive electrode plate or the negative electrode plate of the body may be a connection formed by bundling them into one.

  According to this, the storage element includes a plurality of electrode bodies, and the endmost connection portion is a positive electrode plate or a negative electrode plate included in the electrode body disposed at the end of the plurality of electrode bodies. It is a connection part formed by being bundled. Thus, when the storage element is provided with a plurality of electrode bodies, and the electrode plates of the electrode bodies at the end of the plurality of electrode bodies are bundled into one to form the end connection portion, the end connection is performed. A gap is likely to occur between the part and the container. Therefore, the projection of the spacer can be easily disposed in the gap between the end connection portion of the electrode body and the container. Thus, the projection of the spacer serves as a buffer material against external impact and the like, and damage to the endmost connection portion of the electrode body can be suppressed. In addition, the gap formed between the endmost connection portion of the electrode body and the container is filled with the projection of the spacer, thereby suppressing movement and damage of the endmost connection portion due to external vibration or impact. be able to.

  Further, the projecting portion may be disposed on the opposite side of the current collector to the end connection portion.

  According to this, the protrusion of the spacer is disposed on the opposite side of the current collector to the endmost connection of the electrode body. As described above, the endmost connection portion of the electrode body is easier to contact the container by being disposed closer to the container than the current collector, but the projection of the spacer is between the endmost connection portion and the container. Since it arrange | positions, it can suppress that an end connection part contacts a container. Thus, the projection of the spacer serves as a buffer material against external impact and the like, and damage to the endmost connection portion of the electrode body can be suppressed. In addition, by arranging the current collector on the opposite side of the container than the endmost connection, a gap is easily generated between the endmost connection and the container, but the gap may be filled with the projection of the spacer. Thus, it is possible to prevent the endmost connection portion from being moved and damaged due to external vibration or impact.

  Further, the current collector includes two electrode body connection parts connected to the end connection part of the one or more connection parts and a connection part adjacent to the end connection part, and the two electrodes. The connection part which connects the edges by the side of the said electrode body of a body connection part may be made to have.

  According to this, the current collector has the connecting portion connecting the end edges of the two electrode connecting portions connected to the end connecting portion of the electrode body and the connecting portion adjacent thereto to the electrode body. . As described above, when the connecting portion is provided on the current collector, the movement of the endmost connection portion of the electrode body to the current collector side is restricted, so that the endmost connection portion is collected by an external impact or the like. If pressed to the side of the current collector, the endmost connection may be damaged. Therefore, by arranging the projection of the spacer between the endmost connection and the container, the projection of the spacer becomes a buffer material against external impact, etc., and the endmost connection of the electrode body It can suppress damage.

  The protrusion may have a recess on the side opposite to the end connection portion, and the spacer may further include a rib or a block-like member disposed in the recess.

  According to this, the spacer has a rib or block-like member in the recess formed in the protrusion of the spacer. As described above, by arranging the rib or block-like member in the recess of the protrusion of the spacer, the protrusion of the spacer can be reinforced. As a result, even when the container is indented by an external impact or the like, the projection of the spacer can protect the endmost connection portion, thereby further suppressing damage to the endmost connection portion of the electrode body can do.

  The present invention can be realized not only as such a storage element, but also as a spacer provided in the storage element.

  According to the storage element of the present invention, damage to the connection portion between the electrode body and the current collector can be suppressed.

It is a perspective view which isolate | separates and shows a container main body the structure of the electrical storage element which concerns on embodiment. It is a perspective view which shows the structure arrange | positioned inside the container main body of the electrical storage element which concerns on embodiment, separating a spacer. It is a perspective view which disassembles and shows each component arrange | positioned inside the container of the electrical storage element which concerns on embodiment. It is a perspective view which shows the structure of the positive electrode collector which concerns on embodiment. It is a perspective view which shows the structure of the spacer which concerns on embodiment. It is sectional drawing which shows the arrangement position of the electrode body which concerns on embodiment, a positive electrode collector, and a spacer. It is sectional drawing which shows the arrangement position of the electrode body which concerns on embodiment, a positive electrode collector, and a spacer. It is a sectional view showing the composition of the spacer concerning the modification of an embodiment. It is a sectional view showing the composition of the spacer concerning the modification of an embodiment.

  Hereinafter, an energy storage device according to an embodiment (and a modification thereof) of the present invention will be described with reference to the drawings. The embodiments described below are all inclusive or specific examples. The numerical values, shapes, materials, components, arrangement positions and connection forms of the components, the manufacturing process, the order of manufacturing processes, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. Further, among the components in the following embodiments, components not described in the independent claim indicating the highest concept are described as arbitrary components. Further, in the drawings, the dimensions and the like are not strictly illustrated.

  In the following description and drawings of the embodiment, the arrangement direction of a pair of electrode terminals of a storage element, the arrangement direction of a pair of current collectors, the arrangement direction of a pair of spacers, and both ends of an electrode body (a pair of The arrangement direction of the active material layer non-forming portion, the winding axis direction of the electrode body, or the opposing direction of the short side surface of the container is defined as the X axis direction. In addition, the arrangement direction of the plurality of electrode bodies, the arrangement direction of the connection portion with the electrode body in one current collector, the opposing direction of the long side of the container, the short direction of the short side of the container, or the thickness direction of the container Is defined as the Y-axis direction. Further, the direction in which the container body and the lid of the storage element are aligned, the longitudinal direction of the short side of the container, the extending direction of the connection portion with the electrode body of the current collector, or 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). Although it may be considered that the Z-axis direction is not in the vertical direction depending on the mode of use, the Z-axis direction is hereinafter described as the vertical direction for the convenience of description. Further, 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.

Embodiment
[1. General Description of Storage Element 10]
First, general description of the storage element 10 according to the present embodiment will be given using FIGS. 1 to 3. FIG. 1 is a perspective view showing the configuration of a storage element 10 according to the present embodiment with the container main body 110 separated. Moreover, FIG. 2 is a perspective view which shows the structure arrange | positioned inside the container main body 110 of the electrical storage element 10 which concerns on this Embodiment by separating the spacers 500 and 600. FIG. That is, the figure shows the state after connecting the positive electrode current collector 700 and the negative electrode current collector 800 to the electrode assembly 400. FIG. 3 is an exploded perspective view showing each component disposed inside container 100 of power storage device 10 according to the present embodiment. That is, the figure shows a state before connecting the positive electrode current collector 700 and the negative electrode current collector 800 to the electrode assembly 400.

  The storage element 10 is a secondary battery capable of charging and discharging electricity, and specifically, a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. The storage element 10 is used, for example, as a power supply for vehicles such as an electric vehicle (EV), a hybrid electric vehicle (HEV) or a plug-in hybrid electric vehicle (PHEV), a power supply for electronic devices, a power supply for power storage, and the like. The storage element 10 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 may be a capacitor. In addition, the storage element 10 may not be a secondary battery, but may be a primary battery that can use the stored electricity without charging by the user. In addition, although the rectangular parallelepiped (square) storage element 10 is illustrated in the present embodiment, the shape of the storage element 10 is not particularly limited, and may be a cylindrical shape, a long cylindrical shape, or the like. Or a laminate type storage element.

  As shown in FIG. 1, the storage element 10 includes a container 100 having a container body 110 and a lid 120, a positive electrode terminal 200, a positive electrode gasket 210, a negative electrode terminal 300, a negative electrode gasket 310, and an electrode assembly 400. Spacers 500 and 600 are provided. Further, as shown in FIGS. 2 and 3, the storage element 10 further includes a positive electrode current collector 700, a negative electrode current collector 800, and a clip 900.

  Although an electrolytic solution (nonaqueous electrolyte) is enclosed in the inside of the container 100, illustration is omitted. In addition, as the said electrolyte solution, if it does not impair the performance of the electrical storage element 10, there will be no restriction | limiting in particular in the kind, Various things can be selected. In addition to the above components, a gas discharge valve for releasing the pressure when the pressure in the container 100 is increased, a liquid injection unit for injecting an electrolyte into the container 100, or an electrode body 400. An insulating film or the like that wraps the like may be disposed.

[1.1 Description of Container 100, Positive Electrode Terminal 200, and Negative Electrode Terminal 300]
The container 100 is a rectangular parallelepiped (box-shaped) case composed of a container body 110 having a rectangular cylindrical bottom and a lid 120 which is a plate-like member closing the opening of the container body 110. Specifically, the lid 120 is a flat and rectangular wall extending in the X-axis direction, and is disposed on the plus side of the container body 110 in the Z-axis direction. The container body 110 has a flat bottom plate with a rectangular shape at the minus side in the Z-axis direction, a long flat plate with a flat plate and a rectangular shape at the side surfaces at both sides in the Y-axis direction, and a flat plate at the side surfaces at both sides in the X axis It has five walls of a rectangular short side wall.

  In the container 100, the electrode body 400, the spacers 500 and 600, the positive electrode current collector 700, the negative electrode current collector 800 and the like are accommodated inside the container body 110, and then the container body 110 and the lid 120 are welded or the like. This makes it possible to seal the inside. The material of the container body 110 and the lid 120 is not particularly limited, and may be, for example, a weldable metal such as stainless steel, aluminum, an aluminum alloy, iron, a plated steel plate, or a resin.

  The positive electrode terminal 200 is an electrode terminal electrically connected to the positive electrode plate of the electrode body 400, and the negative electrode terminal 300 is an electrode terminal electrically connected to the negative electrode plate of the electrode body 400. That is, positive electrode terminal 200 and negative electrode terminal 300 lead the electricity stored in electrode assembly 400 to the external space of storage element 10, and the electricity in the internal space of storage device 10 for storing electricity in electrode assembly 400. It is a metal electrode terminal for introducing Further, the positive electrode terminal 200 and the negative electrode terminal 300 are attached to a lid 120 disposed above the electrode assembly 400.

  Specifically, the positive electrode terminal 200 is crimped by inserting the protrusion 201 (see FIG. 7) into the through hole of the lid 120, the through hole of the positive electrode gasket 210, and the through hole 711 of the positive electrode current collector 700. Thus, the positive electrode gasket 210 and the positive electrode current collector 700 are fixed to the lid 120 together. Similarly, the negative electrode terminal 300 is fixed to the lid 120 together with the negative electrode gasket 310 and the negative electrode current collector 800. Thus, the positive electrode terminal 200 and the negative electrode terminal 300 are disposed on the positive side in the Z-axis direction of the positive electrode current collector 700 and the negative electrode current collector 800.

  The positive electrode gasket 210 is an insulating sealing member disposed between the lid 120 and the positive electrode terminal 200 and the positive electrode current collector 700. The positive electrode gasket 210 is made of, for example, a resin such as polycarbonate (PC), polypropylene (PP), polyethylene (PE), or polyphenylene sulfide resin (PPS). In addition, since the negative electrode gasket 310 also has the same configuration as that of the positive electrode gasket 210, the detailed description will be omitted.

[1.2 Description of Electrode Body 400]
The electrode assembly 400 includes a positive electrode plate, a negative electrode plate, and a separator, and is a storage element (power generation element) capable of storing electricity. The positive electrode plate is an electrode plate in which a positive electrode active material layer is formed on a positive electrode base material layer which is a long strip-like current collector foil made of aluminum, aluminum alloy or the like. The negative electrode plate is an electrode plate in which a negative electrode active material layer is formed on a negative electrode base material layer which is a long strip-like current collector foil made of copper, copper alloy or the like. In addition, well-known materials, such as nickel, iron, stainless steel, titanium, baked carbon, a conductive polymer, conductive glass, an Al-Cd alloy, can also be used suitably as said current collector foil. In addition, as the positive electrode active material and the negative electrode active material used for the positive electrode active material layer and the negative electrode active material layer, known materials can be appropriately used as long as they are active materials capable of inserting and extracting lithium ions. Moreover, the separator can use the microporous sheet and non-woven fabric which consist of resin, for example.

  The electrode assembly 400 is formed by arranging and winding a separator between the positive electrode plate and the negative electrode plate. Specifically, in the electrode body 400, the positive electrode plate and the negative electrode plate are wound so as to be mutually shifted in the direction of the winding axis (virtual axis parallel to the X-axis direction in this embodiment) via the separator. ing. And a portion (active material layer non-forming portion) where the active material is not coated (the active material layer is not formed) on the end of each of the positive electrode plate and the negative electrode plate in the shifted direction (the active material layer is not formed) )have.

  Here, the electrode assembly 400 may be configured of one or more electrode assemblies, but in the present embodiment, the electrode assembly 400 is configured of a plurality of electrode assemblies. Specifically, the electrode assembly 400 includes two separate electrode assemblies, a first electrode assembly 410 and a second electrode assembly 420.

  That is, in the first electrode body 410, the active material layer non-formed portion of the end of the positive electrode plate is stacked and bundled into one at one end in the winding axial direction (the end on the positive side in the X-axis direction). A first positive electrode end 412 is provided. Further, in the first electrode body 410, the active material layer non-formed portion of the end of the negative electrode plate is stacked on the other end in the winding axial direction (the end on the negative side in the X axis direction) and bundled into one. The first negative electrode end 413 is provided. For example, the thickness of the active material layer non-forming portion (current collecting foil) of the positive electrode plate and the negative electrode plate is about 5 μm to 20 μm, and by bundling about 50 to 70 sheets, for example, the first positive electrode side end portion 412 And the 1st negative electrode side end part 413 is formed. A portion of the first electrode body 410 other than the first positive electrode side end portion 412 and the first negative electrode side end portion 413 is referred to as a first electrode body main portion 411. That is, the first electrode body main part 411 is a portion of the first electrode body 410 in which the active material layer is formed on the base material layer. Similarly, in the second electrode body 420, the second electrode body main portion 421 on which the active material layer is formed, and the second positive electrode side in which the active material layer non-formed portion at the end of the positive electrode plate is bundled into one. An end portion 422 and a second negative electrode side end portion 423 in which an active material layer non-formed portion at the end portion of the negative electrode plate is bundled into one are provided.

  In the present embodiment, an oval shape is illustrated as a cross-sectional shape of the electrode body 400 (the first electrode body 410 and the second electrode body 420), but an elliptical shape, a circular shape, a polygonal shape, or the like may be used. Further, the shape of the electrode body 400 (the first electrode body 410 and the second electrode body 420) is not limited to the wound type, and may be a laminated type (stacked type) in which flat plate-like electrode plates are stacked. It may be in a bellows-like shape (strap-like shape).

[1.3 Description of Positive Electrode Current Collector 700 and Negative Electrode Current Collector 800]
The positive electrode current collector 700 is a current collector on the positive electrode side which is disposed on the positive side in the X-axis direction which is the side of the electrode assembly 400. Specifically, the positive electrode current collector 700 is disposed between the positive electrode side end of the electrode assembly 400 and the short side wall of the container body 110, and the positive electrode terminal 200 and the positive electrode side edge of the electrode assembly 400 are electrically It is a member provided with conductivity and rigidity to be connected. Similarly, the negative electrode current collector 800 is a current collector on the negative electrode side disposed on the negative side in the X-axis direction, which is the side of the electrode assembly 400. That is, the negative electrode current collector 800 is disposed between the negative electrode end of the electrode assembly 400 and the short side wall of the container body 110, and electrically connected to the negative electrode terminal 300 and the negative electrode end of the electrode assembly 400. Is a member provided with conductivity and rigidity.

  Specifically, the positive electrode current collector 700 is fixedly connected (joined) to the first positive electrode side end 412 of the first electrode body 410 and the second positive electrode side end 422 of the second electrode body 420. . More specifically, the first positive electrode side end 412 and the second positive electrode side end 422 are sandwiched between the positive electrode current collector 700 and the two clips 900 and joined by welding or the like. The clip 900 is a plate-like metal member. The positive electrode current collector 700 and the first positive electrode side end 412 and the second positive electrode side end 422 may be joined by any welding method such as laser welding, ultrasonic welding, resistance welding, etc. Other than welding, mechanical bonding such as caulking may be used. The first positive electrode side end 412 of the first electrode body 410 and the second positive electrode side end 422 of the second electrode body 420 are examples of the connection portion of the electrode body. That is, the one or more electrode bodies 400 have one or more connection parts connected to the positive electrode current collector 700.

  Similarly, the negative electrode current collector 800 is fixedly connected (joined) to the first negative electrode side end portion 413 of the first electrode body 410 and the second negative electrode side end portion 423 of the second electrode body 420. That is, the first negative electrode side end portion 413 and the second negative electrode side end portion 423 are sandwiched between the negative electrode current collector 800 and the two clips 900 and joined by welding or the like.

  In addition, the positive electrode current collector 700 and the negative electrode current collector 800 are fixedly connected (joined) to the lid 120. With this configuration, the first electrode body 410 and the second electrode body 420 are held (supported) in a state of being suspended from the lid 120 by the positive electrode current collector 700 and the negative electrode current collector 800, and vibration from the outside Vibration due to impact is suppressed.

  Although the material of the positive electrode current collector 700 is not limited, for example, like the positive electrode base layer of the electrode assembly 400, it is formed of aluminum or an aluminum alloy. Also, the material of the negative electrode current collector 800 is not limited, but, for example, like the negative electrode base layer of the electrode assembly 400, it is formed of copper or a copper alloy. The detailed description of the configurations of the positive electrode current collector 700 and the negative electrode current collector 800 will be described later.

  Here, when describing the positional relationship of members on the positive electrode side, such as the positive electrode current collector 700, the direction directed to the positive side in the X-axis direction is also referred to as a first direction. For example, it can be said that the positive electrode current collector 700 is disposed on the first direction side of the electrode body 400. In addition, since the member on the negative electrode side such as the negative electrode current collector 800 is disposed in the opposite direction to the member on the positive electrode side in the X-axis direction, when applied to the positional relationship of the members on the negative electrode side, the X axis direction The direction toward the minus side is the first direction. For example, like the positive electrode current collector 700, it can be said that the negative electrode current collector 800 is disposed on the first direction side of the electrode assembly 400. Further, a direction intersecting with the first direction (in the present embodiment, a direction directed to the plus side in the Z-axis direction) is also referred to as a second direction. For example, it can be said that the positive electrode terminal 200 and the negative electrode terminal 300 are disposed on the second direction side of the positive electrode current collector 700 and the negative electrode current collector 800.

[1.4 Description of spacers 500 and 600]
The spacer 500 is a spacer disposed on the positive side (first direction side) in the X-axis direction which is the side of the positive electrode current collector 700, and between the positive electrode current collector 700 and the short side wall portion of the container body 110. It is arranged to extend in the Z-axis direction (second direction) along the short side wall portion. The spacer 600 is a spacer disposed on the negative side in the X-axis direction, which is the side of the negative electrode current collector 800, and between the negative electrode current collector 800 and the short side wall portion of the container body 110. It is arranged to extend along the Z-axis direction. That is, the spacer 500 and the spacer 600 are disposed between both ends of the electrode body 400 and both side walls of the container 100 so as to sandwich the electrode body 400 from both ends in the X-axis direction.

  Here, the spacers 500 and 600 are formed of, for example, an insulating material such as polypropylene (PP), polyphenylene sulfide (PPS), polyethylene terephthalate (PET), ceramic, and a composite material thereof. That is, the spacers 500 and 600 insulate the container 100 from the electrode body 400, the positive electrode current collector 700 and the negative electrode current collector 800. In addition, the spacers 500 and 600 fill the space between the electrode body 400, the positive electrode current collector 700 and the negative electrode current collector 800, and the container 100 to obtain the electrode body 400, the positive electrode current collector 700 and the negative electrode current collector. 800 supports the container 100 against vibration. A detailed description of the configuration of the spacers 500 and 600 will be described later.

[2 Detailed Description of Positive Electrode Current Collector 700]
Next, the configuration of the positive electrode current collector 700 will be described in detail. Although the configuration of the positive electrode current collector 700 will be described below, the configuration of the negative electrode current collector 800 is the same as that of the positive electrode current collector 700. FIG. 4 is a perspective view showing the configuration of the positive electrode current collector 700 according to the present embodiment. Specifically, FIG. 4 (a) is an enlarged perspective view showing the positive electrode current collector 700 shown in FIG. 3, and FIG. 4 (b) is a positive electrode collection of FIG. 4 (a). FIG. 10 is a perspective view of the current collector 700 as viewed from the opposite side (rear side).

  As shown in FIG. 4, the positive electrode current collector 700 includes a terminal connecting portion 710, a first electrode connecting portion 720 and a second electrode connecting portion 730, a connecting portion 740, an intermediate portion 750, and an extending portion. And the 760.

  The terminal connection portion 710 is a base of the positive electrode current collector 700 connected to the positive electrode terminal 200. That is, the terminal connection portion 710 is a rectangular and flat portion disposed on the positive electrode terminal 200 side (upper side, positive side in the Z-axis direction) of the positive electrode current collector 700. Connected (joined). Note that, in the terminal connection portion 710, a circular through hole 711 into which the protrusion 201 of the positive electrode terminal 200 described above is inserted, and a through for rotation prevention into which the protrusion 211 (see FIG. 7) of the positive electrode gasket 210 is inserted. A hole 712 and a bead portion 713 for reinforcement are formed.

  The first electrode body connection portion 720 and the second electrode body connection portion 730 are portions connected to the electrode body 400. That is, the first electrode connection portion 720 and the second electrode connection portion 730 are portions disposed on the electrode body 400 side (lower side, the negative side in the Z-axis direction) of the positive electrode current collector 700. Electrically and mechanically. Specifically, the first electrode body connection portion 720 is a long and flat portion extending in the Z-axis direction (second direction), and is disposed on the first electrode body 410 side (minus side in the Y-axis direction) And connected to the first positive electrode end 412 of the first electrode body 410. Further, the second electrode body connection portion 730 is a long and flat portion extending in the Z-axis direction (second direction), and is disposed on the second electrode body 420 side (plus side in the Y-axis direction). It is connected to the second positive electrode side end 422 of the second electrode body 420.

  The connecting portion 740 is an end edge of the first electrode body connecting portion 720 on the electrode body 400 side (the negative side in the X-axis direction or the side opposite to the first direction), and an electrode body of the second electrode body connecting portion 730 It is a part that connects the edge on the 400 side. That is, the connecting portion 740 connects the end edges on the electrode body 400 side of the two connecting portions connected to the electrode body 400 of the positive electrode current collector 700, and is a long and flat wall extending in the Z-axis direction. It is a department. Thus, the connecting portion 740 is disposed at a position facing the electrode body 400 in the X-axis direction (first direction). In addition, a through hole may be formed in the connecting portion 740 in order to secure the injection property of the electrolytic solution.

  The middle portion 750 is a portion disposed between the connecting portion 740 and the terminal connection portion 710 and outside the connecting portion 740 (plus side in the X-axis direction or the first direction side). Here, the middle portion 750 includes a first middle portion 751 and a second middle portion 752.

  The first intermediate portion 751 is a rectangular and flat portion extending from the upper end portion (the end portion on the positive side in the Z-axis direction) of the connecting portion 740 to the positive side in the X-axis direction. That is, the first intermediate portion 751 is a wall portion parallel to the XY plane which is disposed on the plus side (the second direction side) in the Z-axis direction with respect to the first electrode connection portion 720 and the second electrode connection portion 730. . The second intermediate portion 752 is a rectangular and flat portion extending downward (Z-axis direction minus side) from the end of the terminal connection portion 710 on the plus side in the X-axis direction. That is, the second intermediate portion 752 is a wall portion parallel to the YZ plane disposed along the end in a position facing the end of the electrode body 400 in the X-axis direction (first direction).

  The extending portion 760 is a portion extending from the connecting portion 740 to the opposite side (the negative side in the Z-axis direction) to the terminal connecting portion 710 with respect to the first electrode connecting portion 720 and the second electrode connecting portion 730. It is. Specifically, the extending portion 760 is the outer side (the positive side in the X-axis direction or the first direction side) which is the first electrode body connecting portion 720 side and the second electrode body connecting portion 730 side than the connecting portion 740 And the Z axis direction minus side (opposite to the second direction) relative to the connecting portion 740. Here, the extending portion 760 includes a first extending portion 761 and a second extending portion 762.

  The first extending portion 761 is a rectangular and flat portion extending from the lower end portion (end portion on the negative side in the Z-axis direction) of the connecting portion 740 to the positive side in the X-axis direction. That is, the first extending portion 761 is parallel to the XY plane disposed on the Z axis direction minus side (opposite to the second direction) than the first electrode connection portion 720 and the second electrode connection portion 730. It is a wall. Further, the second extending portion 762 is a rectangular and flat portion extending downward (in the Z axis direction minus side) from an end portion on the X axis direction plus side of the first extending portion 761. That is, the second extending portion 762 is a wall parallel to the YZ plane disposed along the end in a position facing the end of the electrode body 400 in the X-axis direction (first direction). . Thus, the first extending portion 761 and the second extending portion 762 are the first electrode connecting portion 720 at the first intermediate portion 751 and the second intermediate portion 752 in the Z-axis direction (the second direction). And the second electrode body connecting portion 730.

  With such a configuration, the positive electrode current collector 700 is formed with a current collector concave portion 741 which is a concave portion having the connecting portion 740 as a bottom portion. That is, the current collector concave portion 741 has the first electrode body connection portion 720 and the second electrode body connection portion 730 which are two connection portions with the electrode body 400, the connection portion 740, the first intermediate portion 751, and It is a recess formed on the negative side in the X axis direction formed by the one extending portion 761.

[Detailed Description of 3 Spacer 500]
Next, the configuration of the spacer 500 will be described in detail. Although the configuration of the spacer 500 will be described below, the configuration of the spacer 600 is the same as the configuration of the spacer 500. FIG. 5 is a perspective view showing the configuration of the spacer 500 according to the present embodiment. Specifically, FIG. 5 (a) is an enlarged perspective view showing the spacer 500 shown in FIGS. 2 and 3, and FIG. 5 (b) shows the spacer 500 of FIG. 5 (a). It is a perspective view at the time of seeing from the other side (the back side).

  As shown in FIG. 5, the spacer 500 includes a spacer main body 510 and spacer side walls 520 and 530. The spacer main body portion 510 is a plate-like portion parallel to the YZ plane extending in the Z-axis direction that constitutes the main body portion of the spacer 500, and has a plurality of projecting portions projecting to the negative side in the X-axis direction. Spacer side wall portions 520 and 530 are plate-like portions parallel to the XZ plane extending in the Z-axis direction constituting the side wall portion of spacer 500, and a protruding portion protruding inward in the Y-axis direction is formed. .

  Specifically, the spacer main body 510 includes a spacer first convex portion 511 and a spacer second convex portion 512. The spacer first convex portion 511 is a substantially rectangular parallelepiped protruding portion (convex portion) that protrudes to the negative side in the X-axis direction (the side opposite to the first direction) and extends in the Z-axis direction. In addition, on the back side (plus side in the X-axis direction) of the spacer first convex portion 511, a spacer first concave portion 511a recessed toward the minus side in the X-axis direction is formed. The spacer second convex portion 512 is a protruding portion (convex portion) that protrudes in the negative side in the X-axis direction and extends in the Y-axis direction, and on the back side (plus side in the X-axis direction) of the spacer second convex portion 512 A spacer second recess 512 a is formed to be recessed toward the negative side in the X-axis direction.

  Here, the spacer second convex portion 512 has a U-shaped (U-shaped) shape in which a central portion on the spacer first convex portion 511 side (plus side in the Z-axis direction) is recessed. As a result, it extends in the Y-axis direction surrounded by the spacer first convex portion 511 and the recessed portion of the spacer second convex portion 512 between the spacer first convex portion 511 and the spacer second convex portion 512. A rectangular spacer recess 513 is formed. The spacer first convex portion 511 is disposed to protrude into the current collector recess 741 of the positive electrode current collector 700, and the extended portion 760 of the positive electrode current collector 700 is disposed in the spacer recess 513. The detailed description of these configurations will be described later.

  The spacer side wall 520 has a spacer third convex portion 521, and the spacer side wall 530 has a spacer fourth convex portion 531. The spacer third convex portion 521 is a substantially rectangular parallelepiped protruding portion (convex portion) that protrudes to the Y axis direction plus side and extends in the Z axis direction. In addition, on the back side (the negative side in the Y-axis direction) of the spacer third convex portion 521, a spacer third concave portion 521a recessed toward the positive side in the Y-axis direction is formed. The spacer fourth convex portion 531 is a substantially rectangular parallelepiped protruding portion (convex portion) that protrudes to the negative side in the Y-axis direction and extends in the Z-axis direction. In addition, on the back side (plus side in the Y-axis direction) of the spacer fourth convex part 531, a spacer fourth concave part 531a recessed toward the minus side in the Y-axis direction is formed.

[4. Description of Arrangement Position of Electrode Body 400, Positive Electrode Current Collector 700, and Spacer 500]
Next, the arrangement positions of the electrode body 400, the positive electrode current collector 700, and the spacer 500 will be described in detail. Although the arrangement position of the positive electrode side (the electrode body 400, the positive electrode current collector 700, and the spacer 500) is described below, the positive electrode position of the negative electrode side (the electrode body 400, the negative electrode current collector 800, and the spacer 600) is also described. It is the same as the arrangement position on the side. 6 and 7 are cross-sectional views showing the arrangement positions of the electrode assembly 400, the positive electrode current collector 700, and the spacer 500 according to the present embodiment. Specifically, FIG. 6 is a cross-sectional view showing the configuration on the positive electrode side when the configuration shown in FIG. 1 is cut along the VI-VI cross section (plane parallel to the XY plane). FIG. 7 is a cross-sectional view showing the configuration on the positive electrode side when the configuration shown in FIG. 1 is cut along the VII-VII cross section (plane parallel to the XZ plane).

  As shown in FIG. 6, in the positive electrode current collector 700, the first electrode body connection portion 720 is in contact with the surface on the Y axis direction plus side of the first positive electrode side end portion 412 of the first electrode body 410. And the first positive electrode end 412. Specifically, the first electrode body connection portion 720 is joined to the first positive electrode side end 412 in a state where the first positive electrode side end 412 is sandwiched with the clip 900. Further, the second electrode body connection portion 730 is joined to the second positive electrode side end portion 422 in a state of being in contact with the surface on the negative side in the Y axis direction of the second positive electrode side end portion 422 of the second electrode body 420 There is. Specifically, the second electrode body connection portion 730 is joined to the second positive electrode side end 422 in a state where the second positive electrode side end 422 is sandwiched with the clip 900. With this configuration, the connecting portion 740 is between the first electrode body 410 and the second electrode body 420, that is, the first positive electrode side end portion 412 of the first electrode body 410 and the second positive electrode side of the second electrode body 420. It is disposed between the end 422.

  Further, the spacer first convex portion 511 protrudes toward the connecting portion 740 in the X-axis direction (first direction), and is disposed in the current collector concave portion 741. That is, the spacer first convex portion 511 is positioned between the first electrode connection portion 720 and the second electrode connection portion 730 and facing the first electrode connection portion 720 and the second electrode connection portion 730. Will be placed. With this configuration, the spacer first convex portion 511 is located between the first electrode body 410 and the second electrode body 420, that is, the first positive electrode side end portion 412 of the first electrode body 410 and the second electrode body 420. It is disposed between the two positive electrode end portions 422 (between the end portions of the two electrode bodies 400).

  Further, the spacer third convex portion 521 and the spacer fourth convex portion 531 are disposed between the container 100 and the end of the electrode assembly 400 and are disposed so as to protrude toward the end of the electrode assembly 400. Further, the spacer third convex portion 521 and the spacer fourth convex portion 531 are disposed on the side opposite to the positive electrode current collector 700 with respect to the end portion of the electrode body 400 and on the opposite side to the end portion of the electrode body 400 Has a recess. Specifically, the spacer third convex portion 521 is disposed between the long side wall portion on the negative side in the Y-axis direction of the container body 110 and the first positive electrode side end portion 412 of the first electrode body 410, and It is disposed so as to protrude toward the side end portion 412 in the Y-axis direction plus side. Specifically, the spacer third convex portion 521 is disposed so as to protrude along the edge of the first electrode body main portion 411 on the plus side in the X-axis direction. Further, the spacer third convex portion 521 is disposed on the opposite side of the first electrode body connection portion 720 with respect to the first positive electrode side end 412, and the spacer third convex portion 521 is provided on the opposite side to the first positive electrode side end 412. It has three recesses 521a. The same applies to the spacer fourth convex portion 531.

  Here, the first positive electrode side end portion 412 and the second positive electrode side end portion 422 are an example of an endmost connection portion disposed at the most end portion (the endmost portion in the Y-axis direction) of one or more connection portions. It is. The endmost connection portion is a connection portion formed by bundling together a positive electrode plate or a negative electrode plate included in the electrode body 400 disposed at the end of the plurality of electrode bodies 400. That is, the first electrode body connection portion 720 and the second electrode body connection portion 730 are two electrode bodies connected to the endmost connection portion and the connection portion adjacent to the endmost connection portion among the one or more connection portions. It is a connection part. In addition, the spacer third convex portion 521 and the spacer fourth convex portion 531 are disposed between the container 100 and the end connection portion, and are projecting portions projecting toward the end connection portion, and the end connection portion The cathode current collector 700 is disposed on the opposite side to the current collector, and has a recess on the opposite side to the endmost connection portion.

  Further, as shown in FIG. 7, in the positive electrode current collector 700, the first intermediate portion 751 is formed on the spacer first convex portion 511 on the Z axis direction plus side (second direction side) of the spacer first convex portion 511. It is arranged facing each other. Further, the first extension portion 761 is disposed on the negative side in the Z-axis direction of the spacer first convex portion 511 (opposite to the second direction side) so as to face the spacer first convex portion 511. That is, the spacer first convex portion 511 is disposed between the first intermediate portion 751 and the first extending portion 761. Specifically, the spacer first convex portion 511 is disposed in a current collector concave portion 741 formed by the connecting portion 740, the first intermediate portion 751, and the first extending portion 761.

  Further, the second positive electrode side end portion 422 has a second positive electrode side upper end portion 422a at the upper portion and a second positive electrode side lower end portion 422b at the lower portion (see FIG. 3). It is joined to a portion between the second positive electrode side upper end portion 422a and the second positive electrode side lower end portion 422b (a central portion in the Z-axis direction of the second positive electrode side end portion 422). Similarly for the first positive electrode side end 412, the second electrode body connection portion 720 is between the first positive electrode side upper end 412a (see FIG. 3) and the first positive electrode side lower end 412b (see FIG. 3). It is joined to the site.

  In addition, the second intermediate portion 752 is disposed at a position facing the first positive electrode side end 412 and the second positive electrode side end 422 in the X-axis direction (first direction). It is disposed along the positive electrode end 422. Specifically, the second intermediate portion 752 is positioned to face the first positive electrode side upper end portion 412a and the second positive electrode side upper end portion 422a in the X-axis direction, the first positive electrode side upper end portion 412a and the second positive electrode side It is disposed along the upper end 422a.

  Similarly, for the second extension portion 762 and the spacer second convex portion 512, the second extension portion 762 and the spacer second protrusion 512 are disposed at positions facing the first positive electrode side end 412 and the second positive electrode side end 422 in the X axis direction (first direction). It is disposed along the one positive electrode end 412 and the second positive electrode end 422. Specifically, the second extending portion 762 and the spacer second convex portion 512 are located on the first positive electrode side at positions facing the first positive electrode side lower end portion 412b and the second positive electrode side lower end portion 422b in the X-axis direction. It arrange | positions along the lower end part 412b and the 2nd positive electrode side lower end part 422b.

  Thus, the second extending portion 762 and the spacer second convex portion 512 form the first electrode body connecting portion 720 and the second electrode body connection with the second intermediate portion 752 in the Z-axis direction (second direction). It is disposed at a position sandwiching the part 730. Specifically, the spacer second convex portion 512 is the first extension in the Z axis direction minus side (opposite to the second direction) than the first electrode connection portion 720 and the second electrode connection portion 730. It is disposed on the minus side in the Z-axis direction with respect to the provision portion 761 and the second extending portion 762.

  In addition, the second extending portion 762 is disposed in the spacer recess 513 opposed to the extending portion 760, so that the second intermediate portion 752 is disposed on the inner side (the negative side in the X-axis direction, the side opposite to the first direction). The surface and the inner surface of the second extending portion 762 and the spacer second convex portion 512 are disposed on the same plane (on the plane P1 in FIG. 7). Further, the surface of the second intermediate portion 752 on the outer side (plus side in the X-axis direction, the first direction side) and the surface on the outer side of the second extending portion 762 are on the same plane (on the plane P2 of FIG. It is arranged. Thus, the second intermediate portion 752 and the second extending portion 762 are disposed in contact with the same inner surface of the spacer main portion 510. Note that arranging on the same plane is not limited to arranging on the same plane completely, but some deviations due to processing errors or selecting an optimal plate thickness for the material, etc. are acceptable. Be done.

[5 Description of effect]
As described above, according to power storage element 10 according to the embodiment of the present invention, electrode body 400 is disposed at the most end of one or more connection portions connected to positive electrode current collector 700. An end connection portion is provided, and the spacer 500 is disposed between the container 100 and the end connection portion of the electrode body 400, and a protrusion protruding toward the end connection portion (the spacer third convex portion 521 and the spacer It has four convex parts 531). Here, the endmost connection portion of the electrode body 400 is disposed in the vicinity of the container 100. However, when the container 100 is dented by an impact from the outside or the like, the endmost connection portion is attached to the container 100. There is a risk of being pressed and damaged. For this reason, the protruding portion of the spacer 500 is disposed between the container 100 and the endmost connection portion of the electrode body 400. Thus, the projecting portion of the spacer 500 serves as a shock absorbing material even in the case of an external impact or the like, and damage to the endmost connection portion of the electrode body 400 can be suppressed. Further, by filling the gap between the container 100 and the end connection portion with the projecting portion of the spacer 500, it is possible to prevent the end connection portion from being moved and damaged due to external vibration or impact. .

  In addition, the protrusion of the spacer 500 can improve the insulation between the container 100 and the end connection portion. Furthermore, it may be difficult to insert the electrode assembly 400 into the container 100 at the time of manufacture of the storage element 10, but the spacer of the spacer 500 may be used to fill the gap between the container 100 and the end connection portion. By arranging 500, the electrode assembly 400 can be easily inserted into the container 100.

  In addition, the storage element 10 includes a plurality of electrode bodies 400, and the endmost connection portion is a positive electrode plate or a negative electrode plate of the electrode body 400 disposed at the end of the plurality of electrode bodies 400. It is a connection part formed by bundling into one. Thus, in the case where the storage element 10 includes the plurality of electrode bodies 400, and the electrode plates of the electrode body 400 at the end of the plurality of electrode bodies 400 are bundled into one to form the endmost connection portion A gap is likely to occur between the end connection portion and the container 100. Therefore, the protrusion of the spacer 500 can be easily disposed in the gap between the end connection portion of the electrode body 400 and the container 100. Thus, the projecting portion of the spacer 500 serves as a shock absorbing material even in the case of an external impact or the like, and damage to the endmost connection portion of the electrode body 400 can be suppressed. Further, the gap formed between the endmost connection portion of the electrode body 400 and the container 100 is filled with the protruding portion of the spacer 500, whereby the endmost connection portion is moved and damaged by external vibration or impact. Can be suppressed.

  Further, the protruding portion of the spacer 500 is disposed on the opposite side of the positive electrode current collector 700 with respect to the endmost connection portion of the electrode body 400. As described above, the endmost connection portion of the electrode body 400 is likely to be in contact with the container 100 by being disposed closer to the container 100 than the positive electrode current collector 700, but between the endmost connection portion and the container 100. Since the protrusion part of the spacer 500 is arrange | positioned, it can suppress that an end connection part contacts the container 100. As shown in FIG. Thus, the projecting portion of the spacer 500 serves as a shock absorbing material even in the case of an external impact or the like, and damage to the endmost connection portion of the electrode body 400 can be suppressed. Further, by arranging the positive electrode current collector 700 on the opposite side of the container 100 than the endmost connection, a gap is easily generated between the endmost connection and the container 100, but the protrusion of the spacer 500 Since the gap can be filled, it is possible to prevent the endmost connection portion from being moved and damaged due to external vibration or impact.

  In addition, the positive electrode current collector 700 includes two electrode body connection portions (a first electrode body connection portion 720 and a second electrode body connection portion 730 connected to the end connection portion of the electrode body 400 and the connection portion adjacent thereto. And the connection part 740 which connects the edge of the electrode body 400 side of. As described above, when the connecting portion 740 is provided to the positive electrode current collector 700, the movement of the end connection portion of the electrode assembly 400 to the positive electrode current collector 700 side is restricted, so that an external impact or the like is caused. If the endmost connection portion is pressed to the positive electrode current collector 700 side, the endmost connection portion may be damaged. Therefore, by disposing the projecting portion of the spacer 500 between the endmost connection portion and the container 100, the projecting portion of the spacer 500 also serves as a buffer material against external impact, etc. Damage to the end connection can be suppressed.

  Further, since the connecting portion 740 connects the two electrode body connecting portions, the strength of the positive electrode current collector 700 can be secured. In addition, by connecting the end edges of the two electrode body connection portions on the electrode body 400 side with the connecting portion 740, it is possible to prevent the end edges from biting into the electrode body 400 and damaging the electrode body 400. it can. Furthermore, the connection part 740 suppresses the intrusion of contamination (contamination) such as metal powder into the inside of the electrode body 400 by connecting the edges of the two electrode body connection parts on the electrode body 400 side. it can.

  Further, since the spacer third convex portion 521 and the spacer fourth convex portion 531 are disposed along the edge of the first electrode body main portion 411 and the second electrode body main portion 421 on the plus side in the X-axis direction, The movement of the electrode assembly 400 (the first electrode assembly 410 and the second electrode assembly 420) can be suppressed. As a result, it is possible to suppress that the endmost connection portion is moved and damaged even by vibration or impact from the outside.

  Since the negative electrode side also has the same configuration as that of the positive electrode side, the same effect can be obtained.

[6 Description of Modifications]
(Modification)
Next, modifications of the above embodiment will be described. 8A and 8B are cross-sectional views showing the configuration of the spacers 501 and 502 according to a modification of the present embodiment. The same figure is a figure corresponding to the spacer 500 of FIG.

  As shown in FIG. 8A, the spacer 501 in the present modification includes ribs 521 b and 531 b in addition to the configuration of the spacer 500 in the above embodiment. The rib 521b is a substantially triangular protrusion which is disposed in the spacer third concave portion 521a so as to protrude from the back side (the negative side in the Y-axis direction) of the spacer third convex portion 521 into the spacer third concave portion 521a. The rib 531 b is a substantially triangular protrusion which is disposed in the spacer fourth concave portion 531 a so as to protrude from the back side (plus side in the Y-axis direction) of the spacer fourth convex portion 531 into the spacer fourth concave portion 531 a. In the present modification, the ribs 521 b and 531 b are integrally formed with the spacer third convex portion 521 and the spacer fourth convex portion 531, but may be configured as separate members. About the other structure in this modification, since it has the structure similar to the said embodiment, description is abbreviate | omitted.

  Further, as shown in FIG. 8B, the spacer 502 in the present modification includes blocks 521 c and 531 c in addition to the configuration of the spacer 500 in the above embodiment. The block 521 c is a block-like member disposed in the spacer third concave portion 521 a formed on the back side (the negative side in the Y-axis direction) of the spacer third convex portion 521. The block 531 c is a block-like member disposed in the spacer fourth concave portion 531 a formed on the back side (plus side in the Y-axis direction) of the spacer fourth convex portion 531. In the present modification, the blocks 521c and 531c are members separate from the spacer third convex portion 521 and the spacer fourth convex portion 531, but integrally with the spacer third convex portion 521 and the spacer fourth convex portion 531. It may be formed. In addition, about the other structure in this modification, since it has the structure similar to the said embodiment, description is abbreviate | omitted.

  As described above, according to the storage element of the present modification, the same effect as that of the above embodiment can be obtained. In particular, the spacers 501, 502 have ribs 521b and 531b or blocks 521c and 531c in the recesses formed in the protrusions of the spacers 501,502. As such, by arranging the rib or block-like member in the recess of the protrusion of the spacer 501, 502, the protrusion of the spacer 501, 502 can be reinforced. Thus, even when the container 100 is dented due to an external impact or the like, the projecting portions of the spacers 501 and 502 can protect the endmost connection portion, so that the endmost connection portion of the electrode body 400 is damaged. Can be further suppressed.

  The material of the ribs 521b and 531b or the blocks 521c and 531c is not particularly limited. For example, if a member having high heat resistance and rigidity is used, the endmost connection portion of the electrode body 400 can be further protected. In addition, since the protrusions of the spacers 501 and 502 are reinforced, the insulation between the container 100 and the end connection portion can be further improved. Furthermore, since the protruding portions of the spacers 501 and 502 are reinforced, the electrode assembly 400 can be further easily inserted into the container 100 when the storage element 10 is manufactured.

(Other modifications)
As mentioned above, although the electrical storage element which concerns on embodiment and its modification of this invention was demonstrated, this invention is not limited to this embodiment and its modification. That is, it should be understood that the embodiment disclosed this time and the modification thereof are illustrative in all points and not restrictive. The scope of the present invention is indicated not by the above description but by the claims, and is intended to include all the modifications within the meaning and scope equivalent to the claims.

  For example, in the above-mentioned embodiment and its modification, the electrode assembly 400 has two electrode assemblies, and the endmost connection portion is one of the electrode plates of the electrode assembly at the endmost portion of the two electrode assemblies. It was decided that it is a connection part formed by being bundled. However, the electrode assembly 400 is formed of one electrode assembly, and the endmost connection portion is the connection portion of the endmost portion when the electrode plate of the one electrode assembly is divided into a plurality of connection portions. It may be Even in this case, if the number of turns of the electrode plate is large, or depending on the winding method of the electrode plate, a gap is generated between the container 100 and the end connection portion, so by arranging the projection of the spacer in the gap The same effect as that of the above embodiment can be obtained.

  Further, in the above-described embodiment and the variation thereof, the protrusion of the spacer is disposed on the opposite side of the positive electrode current collector 700 with respect to the end connection portion, but the protrusion of the spacer is the end The connection portion may be disposed on the same side as the positive electrode current collector 700. The same applies to the negative electrode side.

  Further, in the above-described embodiment and the variation thereof, the spacer includes both the spacer third convex portion 521 and the spacer fourth convex portion 531 as the projecting portion. However, the spacer may not have the spacer third convex portion 521 or the spacer fourth convex portion 531. Further, the spacer may not have the spacer first convex portion 511 and the spacer second convex portion 512. The same applies to the negative electrode side.

  Further, in the above-described embodiment and the variation thereof, the connecting portion 740 connects the end edges of the first electrode body connecting portion 720 and the second electrode body connecting portion 730 on the electrode body 400 side (minus side in the X-axis direction). I decided to However, the connecting portions 740 are the end positions of the first electrode body connecting portion 720 and the second electrode body connecting portion 730 on the opposite side (plus side in the X-axis direction) to each other, or the center position in the X-axis direction Any position may be connected, such as connecting the two. That is, the connecting portion 740 connects the first electrode body connecting portion 720 and the second electrode body connecting portion 730, and the first positive electrode side end portion 412 of the first electrode body connecting portion 720 and the second electrode body connecting portion 730. And the portion disposed along the connection portion with the second positive electrode end 422. In addition, the said connection part is a joining part by the elongate welding etc. which extend in Z-axis direction. Alternatively, the positive electrode current collector 700 may not have the connecting portion 740. The same applies to the negative electrode side.

  Further, in the above-described embodiment and its modification, the positive electrode current collector 700 is joined to the end of the electrode body 400 in a state in which the end of the electrode body 400 is sandwiched with the clip 900. However, the positive electrode current collector 700 may be joined to the end of the electrode body 400 without the clip 900 being disposed. The same applies to the negative electrode side.

  Further, in the above embodiment and its modification, both the positive electrode side spacer and the negative electrode side spacer have the above configuration, but the positive electrode side spacer or the negative electrode side spacer It may not have the configuration.

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

  Furthermore, the present invention can be realized not only as such a storage element, but also as a spacer included in the storage element.

  The present invention is applicable to storage devices such as lithium ion secondary batteries.

REFERENCE SIGNS LIST 10 storage element 100 container 110 container body 400 electrode body 410 first electrode body 412 first positive electrode side end 420 second electrode body 422 second positive electrode side end 500, 501, 502, 600 spacer 521 spacer third convex portion 521 a Spacer third concave portion 521b, 531b Rib 521c, 531c block 531 Spacer fourth convex portion 531a Spacer fourth concave portion 700 Positive electrode current collector 720 First electrode body connection portion 730 Second electrode body connection portion 740 Joint portion

Claims (5)

A storage element comprising: a container; one or more electrode bodies; a current collector connected to the one or more electrode bodies; and a spacer disposed to the side of the current collector,
The one or more electrode bodies have one or more connection parts connected to the current collector,
The one or more connections have an endmost connection located at the farthest end,
The said spacer is arrange | positioned between the said container and the said end connection part, and has a protrusion part which protrudes toward the said end connection part. The one or more electrode bodies are a plurality of electrode bodies in which a positive electrode plate and a negative electrode plate are stacked,
The end connection portion is a connection portion formed by bundling together the positive electrode plate or the negative electrode plate included in the electrode body disposed at the end of the plurality of electrode bodies. A storage element according to claim 1. The storage element according to claim 1, wherein the protrusion is disposed on the opposite side of the current collector with respect to the end connection portion. The current collector is
Two electrode body connection parts connected to the endmost connection part and the connection part adjacent to the endmost connection part among the one or more connection parts;
The storage element according to claim 3, further comprising: a connection part connecting ends of the two electrode connection parts on the electrode body side. The protrusion has a recess on the side opposite to the end connection portion,
The storage element according to any one of claims 1 to 4, wherein the spacer further has a rib or block-like member disposed in the recess.

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