JP2018107099A - Power storage element and manufacturing method of power storage element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric storage element including an electrode body and a container that accommodates the electrode body and capable of being efficiently manufactured.SOLUTION: An electric storage element 10 including an electrode body 400 and a container 100 that accommodates the electrode body 400 includes a spacer 500 disposed between a cover plate 110 of the container 100 and the electrode body 400, and a buffer sheet 600 disposed between the spacer 500 and the electrode assembly 400 and attached to the spacer 500, and a positive electrode tab 410 and a negative electrode tab 420 of the electrode assembly 400 are disposed in a state where the sides of the spacer and a buffer sheet 600 pass through the alignment direction of the spacer 500 and the buffer sheet 600.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an electricity storage device including an electrode body and a container for housing the electrode body, and a method for manufacturing the same.

  Conventionally, in a power storage device including an electrode body and a container that accommodates the electrode body, a configuration in which a spacer or the like that fills at least a part of the space is disposed in a space between the electrode body and the wall of the container is known. ing.

  For example, Patent Document 1 discloses a sealing plate and a square sealed secondary battery in which an insulating plate and a spacer are disposed below the sealing plate. Patent Document 1 describes that, for example, the impact resistance of the spacer is improved by providing a bridging portion or a rib on the spacer.

JP 2011-204469 A

  For example, when the spacer is arranged along the electrode body as in the conventional square sealed secondary battery, when the relatively rigid spacer contacts the electrode body, there is no problem with the electrode body. For example, a buffer member may be arranged between the spacer and the electrode body. However, the buffer member is generally easily deformed because it is formed using a highly flexible material. This causes, for example, difficulty in handling the buffer member in the manufacturing process.

  The present invention has been made by the inventor of the present application newly paying attention to the above-described problem, and is an electricity storage element that includes an electrode body and a container that accommodates the electrode body, and can be efficiently manufactured. And a method of manufacturing the same.

  In order to achieve the above object, a power storage element according to one embodiment of the present invention is a power storage element including an electrode body and a container that accommodates the electrode body, and is provided between a wall portion of the container and the electrode body. A spacer disposed between the spacer and the electrode body, and a buffer member attached to the spacer, and an electrode tab of the electrode body includes a side of the spacer and the buffer member, It arrange | positions in the state which passed in the arrangement direction of the said spacer and the said buffer member.

  Here, as a method of arranging the spacer and the buffer member in the electric storage element, a through hole having a closed periphery is opened in the spacer and the buffer member, the electrode tab is passed through the through hole, and the electrode tab is connected to a current collector or the like. There is a method of connecting to a conductive member. However, when such a closed through hole is used, it is necessary to pass the electrode tab through the through hole before connecting the electrode tab to the conductive member, and the spacer and the buffer member are obstructive. Therefore, there was a problem that it was difficult to connect.

  Therefore, the inventor of the present application has come up with an idea of arranging the electrode tab in a state of passing through the side of the spacer and the buffer member instead of passing the electrode tab through the through hole whose periphery is closed. If it does in this way, after connecting an electrode tab to an electroconductive member, a spacer and a buffer member can be installed between the wall part (for example, cover board) of a container, and an electrode body.

  However, when the electrode tab is arranged in such a manner that it passes through the side of the spacer and the buffer member, it is necessary to install the spacer and the buffer member from the side of the electrode tab. In this case, since the buffer member is made of a soft material, the end of the buffer member comes into contact with some member and is turned up or pressed down to be distorted, so that the entire required portion cannot be covered properly. The inventor of the present application predicted that this problem occurs at a frequency that causes a problem in practice. On the other hand, when the spacer and the buffer member are provided with through-holes whose periphery is closed, the spacer and the buffer member are installed so as to approach the electrode body from above the electrode tab. It is thought that it does not occur at a frequency that causes a problem. In other words, the problem that the buffer member is turned up or distorted is that at least one of the positive electrode tab and the negative electrode tab, which are electrode tabs of the electrode body, is disposed in a state of passing through the side of the spacer and the buffer member. It can be said that it is peculiar to. Moreover, it can be said that it is peculiar when using the shock absorbing member which has the softness | flexibility which turns up or bends when it contacts another member.

  In the above embodiment of the present invention, since the buffer member attached to the spacer is used, the buffer member is supported by the spacer. Therefore, even if the tab of the electrode body is arranged in a state of passing through the sides of the spacer and the buffer member, and even if the buffer member is a soft material, the buffer member is in contact with other members. Suppression and distortion are suppressed. As a result, it is possible to provide a power storage element in which the buffer member is easily disposed appropriately while maintaining the ease of manufacturing the power storage element.

  As described above, the power storage device according to this aspect is a power storage device including an electrode body and a container that accommodates the electrode body, and can be efficiently manufactured.

  In the energy storage device according to one embodiment of the present invention, the spacer and the buffer member have an opening formed in a notch shape, and the electrode tab includes the opening of each of the spacer and the buffer member. It is good also as arrange | positioning in the state which passed the side of the edge in.

  According to this configuration, for example, when the electrode body is viewed in plan (when viewed from the side where the spacer and the buffer member are arranged), the region other than the opening can be covered with the spacer and the buffer member. Therefore, for example, the reliability of insulation between the electrode body and the container by the spacer is improved while maintaining ease of manufacture.

  Further, in the energy storage device according to one embodiment of the present invention, one of the spacer and the buffer member has a protruding portion that protrudes in a direction intersecting with an arrangement direction of the spacer and the buffer member. The other of the members may have an engaging portion that engages when the protruding portion is inserted.

  According to this configuration, the buffer member is attached to the spacer without using another member such as an adhesive or an adhesive tape. Further, since the protruding portion is formed so as to protrude in the direction in which the spacer and the buffer member are arranged, that is, in the direction intersecting with the overlapping direction of these two members, the movement of the buffer member in the direction away from the spacer hardly occurs. . Thereby, for example, the effect of suppressing the turning up of the buffer member and the like is improved.

  In the energy storage device according to one aspect of the present invention, the buffer member is engaged with the engaging portion provided in the buffer member, and the protruding portion provided in the spacer is engaged with the spacer. It may be attached.

  According to this configuration, the buffer member only needs to be formed with a hole or the like on which the protruding portion is hooked as the engaging portion. Therefore, for example, it is possible to configure the buffer member using a highly flexible material. As a result, for example, the shock absorbing function by the buffer member can be improved. In addition, for example, the buffer member becomes softer, so that the mounting operation of the buffer member to the spacer is facilitated.

  In the energy storage device according to one embodiment of the present invention, the buffer member may include a slit that is the engaging portion.

  According to this configuration, since the slit is formed as the engaging portion in the buffer member, for example, the amount of loss of the buffer member due to the formation of the engaging portion is suppressed. That is, the buffer function is prevented from being lowered by providing the buffer member with a portion (engagement portion) for attachment to the spacer.

  In the energy storage device according to one embodiment of the present invention, the spacer includes two or more protrusions, and the buffer member includes two or more engagements that respectively engage with the protrusions of the spacer. It may have a part.

  According to this configuration, for example, by making the protruding directions of the two protruding portions different from each other, it is possible to improve the effect of suppressing the falling off of the buffer member from the spacer. For example, when the buffer member is long, the buffer member can be stably fixed to the spacer by engaging at least both ends of the buffer member in the longitudinal direction with the spacer.

  Further, in the energy storage device according to one embodiment of the present invention, the spacer and the buffer member are elongated in the same direction, and the spacer has a longitudinal end portion and a position between the both end portions. It is good also as each having the said protrusion part and the said buffer member having three or more said engaging parts which each engage with the said protrusion part of the said spacer.

  According to this configuration, the long buffer member engages with the spacer at at least three positions in the longitudinal direction and the positions therebetween. Therefore, for example, slack or deflection of the buffer member formed of a highly flexible material can be suppressed. Therefore, for example, it is possible to more reliably maintain the posture of the buffer member in the manufacturing process of the power storage element.

  In the energy storage device according to one embodiment of the present invention, the electrode body has an end portion in which end edges of electrode plates are stacked, and the spacer and the buffer member include the wall portion of the container and the electrode. It is good also as arrange | positioning between the said edge parts of a body.

  According to this configuration, when the electrode body is, for example, a wound electrode body formed by winding an electrode plate, the electrode body is structurally a weak part of the electrode body in the winding axis direction. The ratio of the volume occupied by the electrode body in the container can be increased while protecting the end by the buffer member. That is, an energy storage device having a high energy density and capable of being efficiently manufactured is realized.

  In addition to the case where the electrode body is of the above-described winding type, for example, a plate-shaped electrode plate is laminated, or the electrode body is formed by folding a long strip-shaped electrode plate, etc. In the case of an electrode body having an end portion where the edge of the plate is laminated, the following can be said.

  Since the electrode width often differs between the two types of electrode plates (positive electrode plate and negative electrode plate) of the electrode body, the surface of the electrode body formed by overlapping the end portions of the electrode plates (the end portions of the electrode body) ), It is common that one electrode plate protrudes from the other electrode plate. Under such circumstances, when a hard member comes into contact with the end of the electrode body, there is a problem that the edge of the electrode plate is very easily damaged and a short circuit is likely to occur. In the said aspect in this invention, since the buffer member is arrange | positioned so as to oppose the edge part of the electrode body which is the part by which the edge of the electrode plate was laminated | stacked, such a short circuit can be suppressed. That is, the present invention has a particularly important significance when the buffer member is disposed so as to face the end portion of the electrode body, on which the edge of the electrode plate is laminated.

  In addition, a method for manufacturing a power storage element according to one embodiment of the present invention includes an electrode body, a container that houses the electrode body, a spacer that is disposed between a wall portion of the container and the electrode body, the spacer, A method of manufacturing an electric storage element comprising a buffer member disposed between the electrode bodies, wherein the spacer in a state where the buffer member is attached to the spacer in advance from the side of the electrode tab of the electrode body; A disposing step of disposing the buffer member between the wall portion of the container and the electrode body;

  According to this manufacturing method, for example, after the tab of the electrode body is joined to a conductive member such as a current collector, the spacer and the buffer member are arranged from the side of the tab (from the direction intersecting the protruding direction of the tab). can do. That is, the tab and the current collector can be joined in a state where the spacer and the buffer member are not arranged, and the spacer and the buffer member are retrofitted to the electrode body for which the work such as joining has been completed. can do. Further, when the spacer and the buffer member are arranged from the sides of the tabs of both poles, for example, the buffer member is attached to the spacer, so that, for example, the buffer member is turned up or misaligned. These effects contribute to the improvement of the ease of manufacture of an electrical storage element provided with a spacer and a buffer member.

  Here, when a through hole whose periphery is closed is opened in the spacer and the buffer member, the electrode tab is passed through the through hole, and the electrode tab is connected to a conductive member such as a current collector, the spacer and the buffer member are connected to the electrode tab. It is installed so as to approach the electrode body from above. For this reason, it is considered that the above-described problem such as turning up of the buffer member does not occur at a frequency that causes a practical problem. That is, it can be said that the occurrence of the problem is peculiar when the electrode tab of the electrode body is arranged from the side of the spacer and the buffer member. Moreover, it can be said that it is peculiar when using the buffer member which has a softness | flexibility of the degree which turns up or warps when it contacts another member.

  In this regard, in the method for manufacturing the energy storage device according to this aspect, the occurrence of a specific problem (such as turning up of the buffer member) that may occur in the arrangement step of arranging the spacer and the buffer member from the side of the electrode tab is Is suppressed by attaching a buffer member to the spacer in advance.

  Thus, according to the method for manufacturing an energy storage device according to this aspect, an energy storage device including an electrode body and a container that accommodates the electrode body can be efficiently manufactured.

  ADVANTAGE OF THE INVENTION According to this invention, it is an electrical storage element provided with the electrode body and the container which accommodates an electrode body, Comprising: The electrical storage element which can be manufactured efficiently, and its manufacturing method can be provided.

It is a perspective view which shows the external appearance of the electrical storage element which concerns on embodiment. It is a disassembled perspective view of the electrical storage element which concerns on embodiment. It is a disassembled perspective view of the cover plate structure which concerns on embodiment. It is a perspective view which shows the structure of the electrode body which concerns on embodiment. It is a top view of the spacer which concerns on embodiment. It is a front view of the spacer which concerns on embodiment. It is a top view of the buffer sheet concerning an embodiment. It is a perspective view which shows the attachment process to the spacer of the buffer sheet which concerns on embodiment. It is a perspective view which shows the arrangement | positioning process of the spacer and buffer sheet which concern on embodiment. It is a cross-sectional schematic diagram which shows the arrangement position of the spacer and buffer sheet which concern on embodiment. It is a perspective view which shows an example of each shape of the spacer which does not have an opening part, and a buffer sheet.

  Hereinafter, a power storage device according to an embodiment of the present invention will be described with reference to the drawings. Each figure is a schematic diagram and is not necessarily illustrated exactly.

  Each of the embodiments described below shows a comprehensive or specific example of the present invention. The shapes, materials, constituent elements, arrangement positions and connection forms of constituent elements, order of manufacturing steps, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. In addition, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims indicating the highest concept are described as optional constituent elements.

  First, a general description of the power storage element 10 according to the embodiment will be described with reference to FIGS.

  FIG. 1 is a perspective view showing an external appearance of a power storage element 10 according to the embodiment. FIG. 2 is an exploded perspective view of the energy storage device 10 according to the embodiment. FIG. 3 is an exploded perspective view of the cover plate structure 180 according to the embodiment. In FIG. 3, the positive electrode lead plate 145 and the negative electrode lead plate 155 bonded to the positive electrode current collector 140 and the negative electrode current collector 150 included in the cover plate structure 180 are illustrated by dotted lines.

  For convenience of explanation, FIG. 1 and the subsequent drawings are described with the Z-axis direction as the vertical direction. However, in the actual usage, the Z-axis direction may not match the vertical direction.

  The power storage element 10 is a secondary battery that can charge electricity and discharge electricity, and more specifically, is a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. The power storage element 10 is applied to, for example, an electric vehicle (EV), a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), or the like. In addition, the electrical storage element 10 is not limited to a nonaqueous electrolyte secondary battery, A secondary battery other than a nonaqueous electrolyte secondary battery may be sufficient, and a capacitor may be sufficient as it. Moreover, the electrical storage element 10 may be a primary battery that can use the stored electricity without being charged by the user.

  As shown in FIG. 1, the electricity storage device 10 includes a container 100, a positive electrode terminal 200, and a negative electrode terminal 300. As shown in FIG. 2, an electrode body 400 is accommodated inside the container 100, and a cover plate structure 180 is disposed above the electrode body 400.

  The lid plate structure 180 includes the lid plate 110, the positive terminal 200, and the negative terminal 300 of the container 100. An upper insulating member 125 is disposed between the lid plate 110 and the positive electrode terminal 200, and an upper insulating member 135 is disposed between the lid plate 110 and the negative electrode terminal 300.

  The cover plate structure 180 further includes a positive electrode current collector 140 electrically connected to the positive electrode tab 410 of the electrode body 400 and a negative electrode current collector 150 electrically connected to the negative electrode tab 420 of the electrode body 400. Have. A lower insulating member 120 is disposed between the cover plate 110 and the positive electrode current collector 140, and a lower insulating member 130 is disposed between the cover plate 110 and the negative electrode current collector 150. Each of the positive electrode tab 410 and the negative electrode tab 420 is an example of an electrode tab. Hereinafter, each of the positive electrode tab 410 and the negative electrode tab 420 may be simply referred to as a “tab”.

  The upper insulating members 125 and 135 and the lower insulating members 120 and 130 have insulation properties such as polycarbonate (PC), polypropylene (PP), polyethylene (PE), or polyphenylene sulfide resin (PPS). It is made of material.

  A spacer 500 and a buffer sheet 600 are disposed between the lid plate structure 180 having the above configuration and the electrode body 400.

  The spacer 500 is a member disposed between the electrode body 400 and the wall portion (cover plate 110) of the container 100. The spacer 500 functions as a member that prevents a short circuit between the lid plate structure 180 and the electrode body 400, for example.

  Further, the spacer 500 according to the present embodiment has a structure for attaching the buffer sheet 600. Specifically, the spacer 500 has a flat plate shape as a whole and has a protrusion 515 that engages with the buffer sheet 600. In the present embodiment, six protrusions 515 are provided on the spacer 500, and each of the protrusions 515 engages with an engagement part 615 provided on the buffer sheet 600. Thereby, the buffer sheet 600 is attached to the spacer 500.

  The spacer 500 further has two locking portions 510. Each of the two locking portions 510 is locked to the mounting portion 122 or 132 (see FIG. 3) included in the lid plate structure 180. Thereby, the position of the spacer 500 is regulated.

  The spacer 500 is made of an insulating material such as PC, PP, PE, or PPS.

  The buffer sheet 600 is an example of a buffer member, and is formed of a highly flexible porous material such as foamed polypropylene or foamed polyethylene. The buffer sheet 600 is a member that relieves or absorbs an impact caused by contact between the electrode body 400 and the spacer 500.

  Details of the structure of the spacer 500 and the buffer sheet 600 will be described later with reference to FIGS. 5A to 9.

  In addition to the elements illustrated in FIGS. 1 to 3, the power storage element 10 includes, for example, an insulating film that wraps around the electrode body 400, and a buffer sheet disposed between the electrode body 400 and the bottom surface of the container 100 (main body 111). Other elements may be provided. In addition, although an electrolytic solution (nonaqueous electrolyte) is sealed inside the container 100 of the electricity storage element 10, the illustration of the electrolytic solution is omitted.

  The container 100 includes a main body 111 having a rectangular cylindrical shape and a bottom, and a lid plate 110 that is a plate-like member that closes an opening of the main body 111. In addition, the container 100 has a structure in which the inside can be sealed by welding the lid plate 110 and the main body 111 after the electrode body 400 and the like are accommodated therein. The material of the cover plate 110 and the main body 111 is not particularly limited, but is preferably a weldable metal such as stainless steel, aluminum, or aluminum alloy.

  As shown in FIGS. 2 and 3, the cover plate 110 is formed with a gas exhaust valve 170 and through holes 110 a and 110 b.

  The positive electrode terminal 200 is an electrode terminal electrically connected to the positive electrode of the electrode body 400 via the positive electrode current collector 140, and the negative electrode terminal 300 is the negative electrode of the electrode body 400 via the negative electrode current collector 150. The electrode terminal is electrically connected to. That is, the positive electrode terminal 200 and the negative electrode terminal 300 lead the electricity stored in the electrode body 400 to the external space of the power storage element 10, and in order to store the electricity in the electrode body 400, It is an electrode terminal made of metal for introducing. The positive electrode terminal 200 and the negative electrode terminal 300 are formed of aluminum or an aluminum alloy.

  Further, the positive terminal 200 is provided with a fastening portion 210 that fastens the container 100 and the positive current collector 140, and the negative terminal 300 is provided with a fastening portion 310 that fastens the container 100 and the negative current collector 150. It has been.

  The fastening portion 210 is a member (rivet) that extends downward from the positive electrode terminal 200. The fastening portion 210 is inserted and caulked into the through hole 125 a of the upper insulating member 125, the through hole 110 a of the cover plate 110, the through hole 120 a of the lower insulating member 120, and the through hole 140 a of the positive electrode current collector 140. As a result, the positive electrode terminal 200 and the positive electrode current collector 140 are electrically connected, and the positive electrode current collector 140, the positive electrode terminal 200, the upper insulating member 125, and the lower insulating member 120 are fixed to the lid plate 110. .

  The fastening portion 310 is a member (rivet) that extends downward from the negative electrode terminal 300. The fastening portion 310 is inserted and caulked into the through hole 135 a of the upper insulating member 135, the through hole 110 b of the lid plate 110, the through hole 130 a of the lower insulating member 130, and the through hole 150 a of the negative electrode current collector 150. Thereby, the negative electrode terminal 300 and the negative electrode current collector 150 are electrically connected, and the negative electrode current collector 150, the negative electrode terminal 300, the upper insulating member 135, and the lower insulating member 130 are fixed to the lid plate 110. .

  The positive electrode current collector 140 is formed of aluminum, an aluminum alloy, or the like. In this embodiment, the positive electrode current collector 140 is electrically connected to the positive electrode tab 410 of the electrode body 400 through the positive electrode lead plate 145. The negative electrode current collector 150 is formed of copper or a copper alloy, and is electrically connected to the negative electrode tab 420 of the electrode body 400 via the negative electrode lead plate 155 in this embodiment.

  Next, the configuration of the electrode body 400 will be described with reference to FIG. FIG. 4 is a perspective view showing the configuration of the electrode body 400 according to the embodiment. In FIG. 4, a part of the wound state of the electrode body 400 is shown in a developed manner.

  The electrode body 400 is a power storage element (power generation element) that can store electricity. As shown in FIG. 4, the electrode body 400 is wound so that the positive electrode plate 450, the separator 470a, the negative electrode plate 460, and the separator 470b are laminated in this order, and the cross section has an oval shape. It is formed by that. Further, the electrode body 400 is formed such that separators 470a and 470b protrude in the winding axis direction side (Z axis direction plus side and minus side). Thereby, it can suppress that the electrode body 400 short-circuits with another electrically-conductive member in the said winding-axis direction side.

  The winding axis is a virtual axis that becomes a central axis when winding the positive electrode plate 450, the negative electrode plate 460, and the like. In this embodiment, the winding axis extends in the Z-axis direction passing through the center of the electrode body 400. Parallel straight lines.

  The positive electrode plate 450 is an electrode plate in which a positive electrode active material layer is formed on the surface of a positive electrode base material layer which is a long metal foil made of aluminum or an aluminum alloy. The negative electrode plate 460 is an electrode plate in which a negative electrode active material layer is formed on the surface of a negative electrode base material layer which is a long metal foil made of copper or a copper alloy.

  The separators 470a and 470b are microporous sheets made of resin. In addition, as a material of the separators 470a and 470b used for the electrical storage element 10, a well-known material can be used suitably as long as the performance of the electrical storage element 10 is not impaired.

  The positive electrode plate 450 has a plurality of positive electrode protrusions 411 protruding outward at one end in the winding axis direction. Similarly, the negative electrode plate 460 includes a plurality of negative electrode protrusions 421 that protrude outward at one end in the winding axis direction. The plurality of positive electrode protrusions 411 and the plurality of negative electrode protrusions 421 are portions where the active material layer is not formed and the base material layer is exposed (active material layer non-forming portions).

  The plurality of positive electrode protrusions 411 and the plurality of negative electrode protrusions 421 are arranged at the same end in the winding axis direction (the Z-axis direction plus end in FIG. 4), and the positive electrode plate 450 and the negative electrode plate 460 are wound. By being rotated, the electrode body 400 is laminated at a predetermined position. Specifically, the plurality of positive electrode protrusions 411 are stacked at predetermined positions in the circumferential direction at one end in the winding axis direction by stacking the positive electrode plates 450 by winding. Further, the plurality of negative electrode protrusions 421 have a predetermined circumferential direction different from the position where the plurality of positive electrode protrusions 411 are stacked at one end in the winding axis direction by stacking the negative electrode plate 460 by winding. Laminated in position.

  As a result, the electrode body 400 is formed with a positive electrode tab 410 formed by stacking a plurality of positive electrode protrusions 411 and a negative electrode tab 420 formed by stacking a plurality of negative electrode protrusions 421. Is done. In the present embodiment, the positive electrode tab 410 and the negative electrode tab 420 are provided on the end portion 480 of the electrode body 400 where the edge edges of the electrode plates (the positive electrode plate 450 and the negative electrode plate 460) are stacked. The positive electrode tab 410 is gathered toward the center in the stacking direction, for example, and joined to the positive electrode lead plate 145 by, for example, ultrasonic welding. Further, the negative electrode tab 420 is gathered, for example, toward the center in the stacking direction, and joined to the negative electrode lead plate 155 by, for example, ultrasonic welding.

  The positive electrode lead plate 145 bonded to the positive electrode tab 410 is bonded to the positive electrode current collector 140, and the negative electrode lead plate 155 bonded to the negative electrode tab 420 is bonded to the negative electrode current collector 150. As a method for joining the positive electrode lead plate 145 and the positive electrode current collector 140 and joining the negative electrode lead plate 155 and the negative electrode current collector 150, for example, ultrasonic welding is employed.

  In the present embodiment, as described above, the positive electrode tab 410 and the negative electrode tab 420 of the electrode body 400 are connected to the lid plate structure 180 via the positive electrode lead plate 145 and the negative electrode lead plate 155. The tab 410 and the negative electrode tab 420 may be directly connected to the lid plate structure 180. That is, the positive electrode tab 410 and the positive electrode current collector 140 may be joined by ultrasonic welding or the like, and the negative electrode tab 420 and the negative electrode current collector 150 may be joined by ultrasonic welding or the like.

  The positive and negative tabs (410, 420) are portions for introducing and deriving electricity in the electrode body 400, such as “tab portion”, “lead (portion)”, or “current collector”. Other names may be given.

  Here, since the positive electrode tab 410 is formed by laminating the positive electrode protruding portion 411 which is a portion where the base material layer is exposed, the positive electrode tab 410 does not contribute to power generation. Similarly, since the negative electrode tab 420 is formed by laminating the negative electrode protruding portion 421 that is a portion where the base material layer is exposed, the negative electrode tab 420 does not contribute to power generation. On the other hand, the portions of the electrode body 400 that are different from the positive electrode tab 410 and the negative electrode tab 420 are formed by laminating portions of the base material layer coated with the active material, and thus contribute to power generation. Hereinafter, this portion is referred to as a power generation portion 430.

  Next, in the electricity storage element 10, the structure of the spacer 500 and the buffer sheet 600 disposed between the wall portion (cover plate 110) of the container 100 and the electrode body 400 will be described with reference to FIGS. 5A to 9. To do.

  FIG. 5A is a plan view of the spacer 500 according to the embodiment, and FIG. 5B is a front view of the spacer 500 according to the embodiment. FIG. 6 is a plan view of the buffer sheet 600 according to the embodiment. In FIG. 6, the engaging portion 615 that is a slit that penetrates the buffer sheet 600 is shown with dots so that it can be easily distinguished from other portions. FIG. 7 is a perspective view showing a process of attaching the cushioning sheet 600 to the spacer 500 according to the embodiment.

  As shown in FIGS. 5A and 5B, the spacer 500 according to the embodiment has a plurality of protrusions 515. Each of the plurality of projecting portions 515 is formed so as to project in a direction intersecting with the alignment direction of the spacer 500 and the buffer sheet 600.

  Specifically, in the present embodiment, each of the plurality of protrusions 515 is formed so as to protrude in the X-axis direction intersecting the Z-axis direction that is the arrangement direction of the spacer 500 and the buffer sheet 600. . More specifically, in the spacer 500 that is long in the X-axis direction, two protrusions 515 are provided at both ends in the longitudinal direction. Two protrusions 515 are provided at positions between both ends in the longitudinal direction of the spacer 500. Further, among the total of six protrusions 515, three protrusions 515 on the left side (X-axis direction minus side) of the spacer 500 in the longitudinal direction protrude leftward, and on the right side of the center (X-axis direction). The three protrusions 515 on the positive side protrude rightward.

  With respect to the spacer 500 having the above structure, the buffer sheet 600 according to the present embodiment has the engaging portions 615 at positions corresponding to the plurality of protrusions 515 included in the spacer 500. In the present embodiment, a slit formed in the highly flexible cushioning sheet 600 made of foamed polypropylene or foamed polyethylene is provided as the engaging portion 615.

  The spacer 500 and the buffer sheet 600 are combined as shown in FIG. Specifically, each of the plurality of protruding portions 515 included in the spacer 500 is engaged with the engaging portion 615 included in the buffer sheet 600. In short, the nail | claw (projection part 515) which the spacer 500 provided in the position corresponding to the said slit is hooked in each of the some slit (engagement part 615) which the buffer sheet 600 has. Thereby, the buffer sheet 600 is attached to the spacer 500.

  More specifically, among the six protrusions 515 included in the spacer 500, for example, the three protrusions 515 that protrude to the left on the left side (X-axis direction minus side) from the center are respectively connected to the buffer sheet 600. Insert into joint 615. In this state, while pulling the cushion sheet 600 to the right side (X-axis direction plus side), each of the three protrusions 515 protruding rightward from the center of the six protrusions 515 of the spacer 500. Is inserted into the engaging portion 615 of the buffer sheet 600.

  After that, the buffer sheet 600 is released from the pulling force, thereby reducing the length in the longitudinal direction. As a result, the buffer sheet 600 is hooked on each of the six protrusions 515 of the spacer 500.

  That is, by using the high flexibility of the buffer sheet 600, the buffer sheet 600 is expanded and contracted, whereby a plurality of protrusions 515 including protrusions 515 opposite to each other, and a plurality of engagement parts of the buffer sheet 600. 615 is engaged. As a result, the buffer sheet 600 is fixed to the spacer 500 in a state where it is difficult to come off from the spacer 500.

  The spacer 500 and the buffer sheet 600 combined in this way are arranged with respect to the electrode body 400 as shown in FIGS.

  FIG. 8 is a perspective view showing an arrangement process of the spacer 500 and the buffer sheet 600 according to the embodiment. FIG. 9 is a schematic cross-sectional view showing the arrangement positions of the spacer 500 and the buffer sheet 600 according to the embodiment. In FIG. 8, the outer shape of the cover plate 110 is represented by a dotted line, and the lower insulating members 120 and 130 are not shown. This also applies to FIG. 10 described later. Further, FIG. 9 illustrates a partial cross section of the electricity storage device 10 when cut along the YZ plane passing through the line IX-IX in FIG. 3.

  As shown in FIG. 8, the spacer 500 and the buffer sheet 600 are disposed from the side of the positive electrode tab 410 and the negative electrode tab 420 with respect to the electrode body 400. That is, the positive electrode tab 410 and the negative electrode tab 420 of the electrode body 400 pass through the side of the spacer 500 and the buffer sheet 600 (the side of the outer peripheral edge) in the arrangement direction of the spacer 500 and the buffer sheet 600 (Z-axis direction). Placed in the state. In the present embodiment, both the positive electrode tab 410 and the negative electrode tab 420 pass through the side in the same direction (the Y axis direction minus side) with respect to the spacer 500 and the buffer sheet 600.

  Specifically, the spacer 500 and the buffer sheet 600 have an opening formed in a notch shape, and the positive electrode tab 410 and the negative electrode tab 420 are located on the sides of the edge of the opening of the spacer 500 and the buffer sheet 600. It is arranged in a state of passing through.

  More specifically, the spacer 500 has an opening 520 formed in a notch shape, for example, as shown in FIG. 5A. The buffer sheet 600 has an opening 620 formed in a cutout shape, for example, as shown in FIG.

  In the spacer 500, two openings 520 are formed corresponding to the positive electrode tab 410 and the negative electrode tab 420. In the buffer sheet 600, two openings 620 are formed corresponding to the positive electrode tab 410 and the negative electrode tab 420. Is formed. Therefore, in a state where the spacer 500 and the buffer sheet 600 are overlapped, the two pairs of the opening 520 and the opening 620 arranged vertically form a space through which each of the positive electrode tab 410 and the negative electrode tab 420 can pass in the vertical direction. Is done.

  When the spacer 500 and the buffer sheet 600 configured as described above are arranged with respect to the electrode body 400, the positive electrode tab 410 passes through the side of the edge of the opening 520 and the opening 620 on the positive electrode side. Further, the negative electrode tab 420 passes through the side of the edge of the opening 520 and the opening 620 on the negative electrode side. Note that the edge of the opening 520 is a part of the outer peripheral edge of the spacer 500, and the edge of the opening 620 is a part of the outer peripheral edge of the buffer sheet 600.

  For example, when focusing on the positive electrode tab 410, as shown in FIG. 9, the positive electrode tab 410 that protrudes from the main body (power generation portion 430) of the electrode body 400 is connected to the positive electrode terminal via the opening 520 and the opening 620. 200 is connected to a conductive member (in the present embodiment, positive electrode lead plate 145) for electrical connection with 200. Therefore, for example, compared with the case where the positive electrode tab 410 bypasses the spacer 500 and the buffer sheet 600 and is connected to the positive electrode lead plate 145, the protruding length of the positive electrode tab 410 from the power generation portion 430 can be shortened. This is advantageous from the viewpoint of suppressing the manufacturing cost of the electrode body 400, for example.

  Further, when the spacer 500 and the buffer sheet 600 are arranged with respect to the electrode body 400, as shown in FIG. 9, the locking portion 510 of the spacer 500 is locked to the mounting portion 122 included in the lower insulating member 120. Can do. Thereby, for example, in FIG. 9, the leftward movement of the spacer 500 and the buffer sheet 600 is restricted. As a result, for example, a state in which the spacer 500 and the buffer sheet 600 press the positive electrode tab 410 (push leftward) does not occur.

  The effect of the positive electrode tab 410 is also applied to the negative electrode tab 420.

  As described above, the energy storage device 10 according to the present embodiment includes the electrode body 400 and the container 100 that houses the electrode body 400. The power storage element 10 is further provided with a spacer 500 disposed between the wall (cover plate 110) of the container 100 and the electrode body 400, and a buffer sheet disposed between the spacer 500 and the electrode body 400 and attached to the spacer 500. 600. The electrode tabs of the electrode body 400 (in this embodiment, the positive electrode tab 410 and the negative electrode tab 420) are arranged in a state of passing through the side of the spacer 500 and the buffer sheet 600 in the arrangement direction of the spacer 500 and the buffer sheet 600. .

  According to this configuration, since the buffer sheet 600 is attached to the spacer 500, for example, even when the buffer sheet 600 is formed of a highly flexible material, the buffer sheet 600 is appropriately used in the manufacturing process of the power storage device 10. Can be maintained in a proper posture. Further, the spacer 500 and the buffer sheet 600 can be handled as a single component.

  Further, the spacer 500 and the buffer sheet 600 are arranged so that the tabs (410, 420) of the electrode body 400 pass through the sides of the spacer 500 and the buffer sheet 600. Therefore, for example, as shown in FIG. 8, after each of the bipolar tabs (410, 420) is connected to the cover plate structure 180, the spacer 500 and the buffer sheet 600 are placed on the bipolar tabs (410, 420) side. From the direction (from the direction intersecting the protruding direction of the tab). That is, in the present embodiment, it can be said that the electrode body 400 does not have an electrode tab that is provided in the spacer 500 and the buffer sheet 600 and penetrates a through-hole whose periphery is closed. In other words, it can also be said that the spacer 500 and the buffer sheet 600 do not have a through hole in which the electrode tab (at least one of the positive electrode tab 410 and the negative electrode tab 420) of the electrode body 400 passes and the periphery is closed.

  That is, in the present embodiment, it is possible to connect the positive electrode tab 410 and the negative electrode tab 420 of the electrode body 400 and the lid plate structure 180 in a state where the spacer 500 and the buffer sheet 600 are not disposed. Further, the spacer 500 and the buffer sheet 600 can be retrofitted to the electrode body 400 that has been connected. Therefore, the spacer 500 and the buffer sheet 600 do not get in the way when performing operations such as ultrasonic welding. That is, compared with the case where the spacer 500 or the buffer sheet 600 cannot be retrofitted, such as when the positive electrode tab 410 or the negative electrode tab 420 is passed through the through-hole provided in the spacer 500 or the buffer sheet 600, It can be said that it is easy to improve manufacturing efficiency.

  Here, when the spacer 500 and the buffer sheet 600 are arranged from the sides of the bipolar tabs (410, 420), the following problems may occur. In other words, the relatively soft cushioning sheet has a problem that its end part comes into contact with any member and is turned up or pressed down and distorted, so that it cannot properly cover the entire required part. It may occur at a frequency that causes a problem. However, in the present embodiment, since the buffer sheet 600 is attached to the spacer 500, for example, occurrence of problems such as turning-up or removal of the buffer sheet 600 is suppressed. Thereby, suitable arrangement | positioning of the buffer sheet | seat 600 is made easy.

  In addition, when a through hole whose periphery is closed is opened in the spacer and the buffer member, and the electrode tab is connected to a conductive member such as a current collector through the electrode tab, the spacer and the buffer member are located above the electrode tab. It is installed so that it may approach an electrode body from. Therefore, it is considered that the above problems do not occur at a frequency that causes a practical problem. That is, the problem that the buffer member is turned up or distorted is that the electrode tab (at least one of the positive electrode tab and the negative electrode tab) of the electrode body is disposed in a state of passing through the side of the spacer and the buffer member. It can be said that it is peculiar to. Moreover, it can be said that it is peculiar when using the buffer member which has a softness | flexibility of the degree which turns up or warps when it contacts another member.

  Thus, in the electricity storage device 10 according to the present exemplary embodiment, the electrode tabs of the electrode body 400 (the positive electrode tab 410 and the negative electrode tab 420 in the present exemplary embodiment) have passed through the side of the spacer 500 and the buffer sheet 600. Therefore, it is easy to manufacture. Furthermore, in power storage device 10 according to the present exemplary embodiment, the occurrence of problems peculiar to this structure (such as turning up of buffer sheet 600) is suppressed by attaching buffer sheet 600 to spacer 500.

  That is, the power storage element 10 according to the present embodiment is a power storage element 10 that includes the electrode body 400 and the container 100 that houses the electrode body 400, and can be efficiently manufactured.

  Further, in the present embodiment, the positive electrode tab 410 is disposed in a state of passing through the side edges of the opening 520 of the spacer 500 and the opening 620 of the buffer sheet 600. Similarly, the negative electrode tab 420 is disposed in a state of passing through the side edges of the opening 520 of the spacer 500 and the opening 620 of the buffer sheet 600.

  According to this configuration, for example, when the electrode body 400 is viewed in plan, a region other than the opening 520 can be covered with the spacer 500 and the buffer sheet 600. Therefore, for example, the reliability of insulation between the electrode body 400 and the container 100 by the spacer 500 is improved while maintaining ease of manufacturing the power storage element 10. Further, as described above, the manufacturing cost of the electrode body 400 can be suppressed. These effects can be obtained by arranging at least one of the positive electrode tab 410 and the negative electrode tab 420 through the openings (520, 620) of the spacer 500 and the buffer sheet 600.

  Further, in the present embodiment, the buffer sheet 600 is attached to the spacer 500 by engaging the engaging portion 615 provided in the buffer sheet 600 with the protruding portion 515 provided in the spacer 500.

  According to this configuration, it is only necessary to form a hole or the like in which the protruding portion 515 is hooked as the engaging portion 615 in the buffer sheet 600. Therefore, for example, it is possible to configure the buffer sheet 600 using a material having very high flexibility. As a result, for example, the shock absorbing function by the buffer sheet 600 can be improved. Further, for example, the buffer sheet 600 becomes softer, so that the buffer sheet 600 can be easily attached to the spacer 500.

  The buffer sheet 600 may have a protruding portion, and the spacer 500 may have an engaging portion. That is, one of the spacer 500 and the buffer sheet 600 has a protruding portion that protrudes in a direction intersecting with the arrangement direction of the spacer 500 and the buffer sheet 600, and the other portion of the spacer 500 and the buffer sheet 600 is inserted with the protruding portion. What is necessary is just to have the engaging part engaged by this.

  According to this configuration, for example, the buffer sheet 600 is attached to the spacer 500 without using another member such as an adhesive or an adhesive tape. In addition, since the projecting portion is formed so as to project in the direction in which the spacer 500 and the buffer sheet 600 are arranged, that is, in the direction intersecting with the overlapping direction of these two members, the projecting portion of the buffer sheet 600 in the direction away from the spacer 500 is formed. Movement is unlikely to occur. Thereby, for example, the effect of suppressing the flip-up of the buffer sheet 600 is improved.

  In addition, since the buffer sheet 600 is attached to the spacer 500 by inserting the protruding portion in the direction intersecting the alignment direction into the engaging portion, the total thickness of the buffer sheet 600 and the spacer 500 in the combined state However, it is suppressed that the protrusion increases. As a result, for example, the volume in the container 100 can be used more effectively for increasing the storage capacity.

  Here, the pair of the protruding portion and the engaging portion is preferably disposed at the end of the spacer 500 and the buffer sheet 600 in the moving direction (Y-axis direction minus side) when the spacer 500 and the buffer sheet 600 are disposed. That is, when the spacer 500 and the buffer sheet 600 are arranged with respect to the electrode body 400, the pair of the projecting portion and the engaging portion is present at the end portion in the moving direction (the front end side in the moving direction). The sheet 600 is hardly turned up. In addition, the edge part of the said moving direction is an edge part of the side in which the notch-shaped opening part (520,620) is provided of the spacer 500 and the buffer sheet 600 in planar view.

  In the present embodiment, the buffer sheet 600 has a slit that is the engaging portion 615. That is, the engaging portion 615 can be formed by, for example, cutting the buffer sheet 600. Therefore, for example, the amount of loss of the buffer sheet 600 due to the formation of the engaging portion 615 in the buffer sheet 600 is suppressed. That is, the buffer function is prevented from being lowered by providing the buffer sheet 600 with a portion (engagement portion 615) for attachment to the spacer 500.

  In the present embodiment, the spacer 500 has two or more protrusions 515, and the cushion sheet 600 has two or more engagement parts 615 that engage with the protrusions 515 of the spacer 500. Yes.

  In this case, for example, the effect of preventing the buffer sheet 600 from falling off the spacer 500 can be improved by making the protruding directions of the two protruding portions 515 different from each other as in the present embodiment. In addition, for example, when the buffer sheet 600 is long as in the present embodiment, the buffer sheet 600 can be stably formed by engaging at least both ends in the longitudinal direction of the buffer sheet 600 and the spacer 500. It can be fixed to the spacer 500.

  Further, in the present embodiment, the spacer 500 and the buffer sheet 600 are long in the same direction, and the spacer 500 has protrusions 515 at both ends in the longitudinal direction and at positions between both ends. Have The buffer sheet 600 has three or more engaging portions 615 that each engage with the protruding portion 515 of the spacer 500.

  Specifically, for example, as shown in FIG. 7, the spacer 500 has two protrusions 515 at both ends in the longitudinal direction (X-axis direction), and two protrusions at a position between both ends. 515. Further, the buffer sheet 600 has six engaging portions 615 that engage with the protruding portions 515 of the spacer 500.

  According to this configuration, the long buffer sheet 600 engages with the spacer 500 at at least three positions in the longitudinal direction between both ends and the positions therebetween. Therefore, for example, it is possible to suppress slack or deflection of the buffer sheet 600 formed of a highly flexible material. Therefore, for example, the maintenance of the posture of the buffer sheet 600 in the manufacturing process of the power storage element 10 is further ensured.

  In addition, the electrode body 400 according to the present embodiment has an end portion 480 in which the edges of the electrode plates (the positive electrode plate 450 and the negative electrode plate 460) are stacked, and the spacer 500 and the buffer sheet 600 are provided on the wall of the container 100. It is arranged between the part (lid plate 110) and the end of the electrode body 400.

  According to this configuration, on the side of the end portion 480 where the positive electrode tab 410 and the negative electrode tab 420 of the electrode body 400 are formed, a current collector and electrode terminals on the lid plate 110 are used for exchanging electricity with the outside. A lid plate structure 180 in which members are aggregated can be disposed. Therefore, for example, while protecting the end 480 (see FIG. 4) in the winding axis direction, which is a weak part of the electrode body 400, by the buffer sheet 600, the ratio of the volume occupied by the electrode body 400 in the container 100 is, for example, Can be increased. That is, the energy storage device 10 having a high energy density, which can be efficiently manufactured, is realized.

  In addition, the method for manufacturing the electricity storage device 10 according to the present exemplary embodiment includes the spacer 500 and the buffer sheet in a state where the buffer sheet 600 is attached to the spacer 500 in advance from the side of the positive electrode tab 410 and the negative electrode tab 420 of the electrode body 400. This includes an arrangement step (see FIG. 8) in which 600 is arranged between the wall portion of the container 100 (the cover plate 110 in the present embodiment) and the electrode body 400.

  According to this manufacturing method, the spacer 500 and the buffer sheet 600 are arranged from the side of the positive electrode tab 410 and the negative electrode tab 420 (from the direction intersecting the protruding direction of the positive electrode tab 410 and the negative electrode tab 420). Therefore, it is possible to connect the positive electrode tab 410 and the negative electrode tab 420 and the cover plate structure 180 in a state where the spacer 500 and the buffer sheet 600 are not arranged, and thereafter, the spacer 500 and the buffer sheet 600. Can be retrofitted to the electrode body 400 that has been connected.

  Further, when the spacer 500 and the buffer sheet 600 are arranged from the side of the positive electrode tab 410 and the negative electrode tab 420, the buffer sheet 600 is attached to the spacer 500 in advance, for example, the buffer sheet 600 is turned up or off. Etc. are suppressed.

  Thus, according to the method for manufacturing power storage element 10 according to the present embodiment, power storage element 10 including electrode body 400 and container 100 that houses electrode body 400 can be efficiently manufactured.

(Other embodiments)
The power storage element according to the present invention has been described based on the embodiments. However, the present invention is not limited to the above embodiment. Unless it deviates from the gist of the present invention, various modifications conceived by those skilled in the art have been applied to the above-described embodiments, or forms constructed by combining a plurality of the constituent elements described above are within the scope of the present invention. include.

  For example, the spacer and the buffer sheet disposed between the wall portion of the container 100 and the electrode body 400 may not have an opening.

  FIG. 10 is a perspective view showing an example of the shape of each of the spacer 700 and the buffer sheet 800 having no opening.

  Each of the spacer 700 and the buffer sheet 800 illustrated in FIG. 10 does not have an opening through which the positive electrode tab 410 or the negative electrode tab 420 passes. However, even in this case, the buffer sheet 800 can be attached to the spacer 700 by engaging each of the plurality of protrusions 715 included in the spacer 700 with the engaging portion 815 of the buffer sheet 800.

  Further, the spacer 700 and the buffer sheet 800 in a combined state are arranged on the electrode body 400 from the side of the positive electrode tab 410 and the negative electrode tab 420, so that about half of the area of the electrode body 400 in the plan view can be removed. 700 and buffer sheet 800. Specifically, in the arrangement direction (X-axis direction) of the positive electrode tab 410 and the negative electrode tab 420, the entire region of the electrode body 400 can be covered with the spacer 700 and the buffer sheet 800. In addition, in the direction orthogonal to the arrangement direction (Y-axis direction), about half of the range of the electrode body 400 can be covered with the spacer 700 and the buffer sheet 800.

  Further, the two locking portions 710 of the spacer 700 are locked to the mounting portions 122 and 132 (see FIGS. 3 and 9) of the lower insulating members 120 and 130, so that the spacer 500 and the buffer sheet 600 are positive tabs. The state which presses 410 and the negative electrode tab 420 does not generate | occur | produce.

  As described above, even when the electricity storage element 10 includes the spacer 700 and the buffer sheet 800 illustrated in FIG. 10, the positive electrode tab 410 and the negative electrode tab 420 of the electrode body 400 are located on the sides of the spacer 700 and the buffer sheet 800. In addition, it is possible to obtain the electricity storage device 10 having a structure in which the spacer 700 and the buffer sheet 800 are arranged in a state in which the spacer 700 and the buffer sheet 800 are passed in the arrangement direction. Accordingly, after the connection work between the positive electrode tab 410 and the negative electrode tab 420 and the cover plate structure 180 is completed, the spacer 700 and the buffer sheet 800 can be arranged from the side of the positive electrode tab 410 and the negative electrode tab 420. The effect of improving ease of operation is obtained.

  Moreover, the electrode body with which the electrical storage element 10 is provided may be provided so that the positive electrode tab and the negative electrode tab protrude from different sides. For example, in the electrode body, only one of the positive electrode tab and the negative electrode tab is led out to the side of the spacer 500 and the buffer sheet 600, and only one of the tabs passes through the side of the spacer 500 and the buffer sheet 600. May be. In this case, the other of the positive electrode tab and the negative electrode tab is connected to, for example, the container 100 of the electricity storage element 10, and thus the container 100 may function as the other electrode terminal (positive electrode terminal or negative electrode terminal). .

  In other words, the electrode tab disposed in a state of passing through the side of the spacer 500 and the buffer sheet 600 may be at least one of the positive electrode tab and the negative electrode tab. Even if only one of the positive electrode tab and the negative electrode tab is disposed in a state of passing through the side of the spacer 500 and the buffer sheet 600, the above-described effect (ensuring the ease of manufacturing the electricity storage device 10 is ensured). And facilitating proper arrangement of the buffer sheet 600, etc.). This is the same even when the spacer 700 and the buffer sheet 800 shown in FIG. 10 are used instead of the spacer 500 and the buffer sheet 600.

  Further, the engaging portion 615 included in the buffer sheet 600 does not need to be a slit. For example, in general, a through hole having a shape recognized as a round hole or a square hole may be provided in the buffer sheet 600 as the engaging portion 615. That is, the engaging part 615 should just have the structure which the protrusion part 515 engages.

  Moreover, in the said embodiment, the protrusion part 515 which the spacer 500 has is L-shaped shape which has the part extended below from the flat body part of the spacer 500, for example, as shown to FIG. 5B. However, the protruding portion 515 does not have a portion extending downward, and may protrude directly from the main body portion of the spacer 500 in the lateral direction (the direction intersecting the alignment direction of the spacer 500 and the buffer sheet 600). Good. Even in this case, since the cushioning sheet 600 has flexibility, each of the plurality of protrusions 515 of the spacer 500 can be engaged with the engaging part 615 included in the cushioning sheet 600. In this case, the influence of the protrusion 515 on the total thickness of the buffer sheet 600 and the spacer 500 in the combined state can be almost eliminated. That is, the thickness can be further reduced. This is advantageous in increasing the storage capacity of the storage element 10, for example.

  In addition, the electrode body 400 included in the power storage element 10 does not have to be a winding type. The power storage element 10 may include a stacked electrode body in which flat plate plates are stacked, for example. Moreover, the electrical storage element 10 may be provided with the electrode body which has a structure which laminated | stacked the elongate strip | belt-shaped electrode plate on the bellows shape by repeating a mountain fold and a valley fold, for example.

  In any case, the end of the electrode body provided with the positive electrode tab and the negative electrode tab is generally formed by arranging the edge of the separator or electrode plate constituting the electrode body. There are soft edges. In this case, for example, by arranging the buffer sheet 600 and the spacer 500 according to the above-described embodiment, the end of the electrode body can be protected.

  Further, for example, in a wound electrode body, at the end of winding of each of the positive electrode plate and the negative electrode plate, a positive electrode tab which is a part of one positive electrode plate and a part of one negative electrode plate Some negative electrode tabs may be provided. In this case, the portion where the positive electrode tab or the negative electrode tab is provided in the electrode body is not the soft end portion. However, even in this case, by arranging the spacer and the buffer sheet between the electrode body and the wall of the container, for example, the occurrence of a problem due to the relatively rigid spacer contacting the electrode body Is suppressed. Further, since the electrode tab (at least one of the positive electrode tab and the negative electrode tab) is arranged in a state of passing through the side of the spacer and the buffer sheet, the ease of manufacturing is ensured as described above. Furthermore, the occurrence of problems peculiar to this structure (such as turning up of the buffer sheet) is suppressed by attaching the buffer sheet to the spacer.

  In addition, for example, another member such as an adhesive, an adhesive tape, a wire, or a band may be used for attaching the buffer sheet 600 to the spacer 500. Further, welding may be employed as a method for attaching the buffer sheet 600 to the spacer 500. In any case, for example, the effect that the spacer 500 and the buffer sheet 600 can be retrofitted to the electrode body 400 that has been connected to the lid plate structure 180 is achieved.

  Further, a part of the lid plate structure 180 that locks the locking portion 510 of the spacer 500 (the mounting portions 122 and 132 in the above embodiment) is provided in addition to the lower insulating members 120 and 130. May be. For example, the locking portion 510 of the spacer 500 may be locked to the positive electrode current collector 140 or the negative electrode current collector 150.

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

DESCRIPTION OF SYMBOLS 10 Power storage element 100 Container 110 Cover plate 110a, 110b, 120a, 125a, 130a, 135a, 140a, 150a Through-hole 111 Main body 120, 130 Lower insulating member 122, 132 Mounting part 125, 135 Upper insulating member 140 Positive electrode current collector 145 Positive electrode lead plate 150 Negative electrode current collector 155 Negative electrode lead plate 170 Gas discharge valve 180 Lid plate structure 200 Positive electrode terminal 210, 310 Fastening portion 300 Negative electrode terminal 400 Electrode body 410 Positive electrode tab 411 Positive electrode protruding portion 420 Negative electrode tab 421 Negative electrode protruding portion 430 Power generation portion 450 Positive electrode plate 460 Negative electrode plate 470a, 470b Separator 480 End portion 500, 700 Spacer 510, 710 Engagement portion 515, 715 Protrusion portion 520, 620 Opening portion 600, 800 Buffer sheet 615, 815 Engagement portion

Claims (9)

An electrical storage element comprising an electrode body and a container for housing the electrode body,
A spacer disposed between the wall of the container and the electrode body;
A cushioning member disposed between the spacer and the electrode body and attached to the spacer;
The electrode tab of the electrode body is disposed in a state in which the side of the spacer and the buffer member passes in the arrangement direction of the spacer and the buffer member. The spacer and the buffer member have an opening formed in a notch shape,
The power storage device according to claim 1, wherein the electrode tab is disposed in a state of passing through a side of an edge of the opening. One of the spacer and the buffer member has a protruding portion that protrudes in a direction intersecting with the alignment direction of the spacer and the buffer member,
The electric storage element according to claim 1, wherein the other of the spacer and the buffer member has an engaging portion that engages when the protruding portion is inserted. The electric storage element according to claim 3, wherein the buffer member is attached to the spacer by engaging the protrusion provided on the spacer with the engaging portion provided on the buffer member. The power storage element according to claim 4, wherein the buffer member has a slit that is the engaging portion. The spacer has two or more protrusions,
The electric storage element according to any one of claims 3 to 5, wherein the buffer member includes two or more engaging portions that each engage with the protruding portion of the spacer. The spacer and the buffer member are elongated in the same direction,
The spacer has the protrusions at both ends in the longitudinal direction and at positions between the both ends,
The electric storage element according to claim 6, wherein each of the buffer members has three or more engaging portions that engage with the protrusions of the spacer. The electrode body has an end portion on which the edge of the electrode plate is laminated,
The power storage device according to claim 1, wherein the spacer and the buffer member are disposed between the wall portion of the container and the end portion of the electrode body.
Power storage element. An electricity storage device comprising: an electrode body; a container that accommodates the electrode body; a spacer that is disposed between a wall portion of the container and the electrode body; and a buffer member that is disposed between the spacer and the electrode body. A manufacturing method of
An arrangement step of disposing the spacer and the buffer member in a state where the buffer member is attached to the spacer in advance between the wall portion of the container and the electrode body from the side of the electrode tab of the electrode body; ,
A method for manufacturing a storage element.

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