JP6550863B2 - STORAGE DEVICE AND METHOD FOR MANUFACTURING STORAGE DEVICE - Google Patents

Description

  The present invention relates to a storage element including an electrode body, a current collector connected to the electrode body, and an electrode terminal.

  Conventionally, a power storage element such as a lithium ion secondary battery has been used as a power source for an electric vehicle (EV), a plug-in hybrid electric vehicle (PHEV), a hybrid electric vehicle (HEV), and the like. Such an electricity storage element generally includes an electrode body, a current collector connected to the electrode body, an electrode terminal, and the like.

  Also, for example, a rivet fixed to the electrode terminal is inserted into a hole provided in the current collector and crimped, whereby the current collector and the electrode terminal are electrically and mechanically connected.

  For example, Patent Document 1 is a rivet member that fixes a current collector to a device housing in a state of penetrating the device housing, and a rivet member that is electrically connected to the current collector to form a current path is disposed. The disclosed power storage device is disclosed. In this power storage device, the electrode terminal has a connecting portion for connecting to the head of the rivet member and a connecting portion for electrically connecting to another device connected by a connecting portion.

  According to this configuration, it is possible to ensure the prevention of rotation of the rivet member while protecting the seal member disposed at the penetration point of the rivet member as much as possible.

JP, 2014-222675, A

  As described above, when the electrode member and the current collector are connected by caulking the metal member penetrating the current collector, the metal member expands in the radial direction by being caulked, thereby the current collector. The portion having the through hole receives radial pressure. As a result, deformation may occur in the current collector. The deformation that occurs in the current collector also becomes a factor such as deformation or damage of the insulating member disposed between the current collector and the container.

  Further, for example, when a metal member extending from the current collector is inserted into the through hole of the electrode terminal and caulked, the electrode terminal can be deformed due to caulking. The deformation that occurs in the electrode terminal also causes deterioration in the quality of bonding between the electrode terminal and a conductive member such as a bus bar, for example.

  In view of the above-described conventional problems, an object of the present invention is to provide a highly reliable power storage device including a connection portion that connects a current collector and an electrode terminal.

  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, a current collector connected to the electrode body, and an electrode terminal, and the current collector And a connecting portion extending from one of the electrode terminals, passing through a through hole provided in the other of the current collector and the electrode terminal, and having an end connected to the other, A connecting portion that electrically connects the current collector and the electrode terminal, and a cylindrical body having a hole through which the connecting portion is inserted, the cylindrical body having an axial end inserted into the through hole. Prepare.

  According to this configuration, the connection portion extending from one of the current collector and the electrode terminal is inserted through the cylindrical body, and passes through the through hole provided in the other of the current collector and the electrode terminal. It is connected with the other. That is, the cylinder can function as, for example, a member for maintaining electrical insulation or airtightness between the connection portion and another member such as a container of the storage element.

  Further, at least a part of the cylindrical body is inserted into the through hole provided in the other of the current collector and the electrode terminal. Therefore, for example, in the manufacturing process of the storage element, the cylindrical body can be used as the other positioning member of the current collector and the electrode terminal. Therefore, for example, occurrence of a defect due to the connection step such as caulking to the connection portion being performed in a state where the current collector or the electrode terminal is deviated from the normal position is suppressed.

  As described above, the storage element of this embodiment is a storage element including a connection portion connecting the current collector and the electrode terminal, and is a highly reliable storage element.

  Further, in the storage element according to one aspect of the present invention, the insertion length of the cylindrical body into the through hole may be shorter than the axial length of the through hole.

  According to this configuration, a part of the cylindrical body is inserted into the through hole provided in the other of the current collector and the electrode terminal, and the length (insertion length) is longer than the axial length of the through hole. short. In other words, the axial presence range of the cylindrical body in the through hole is up to the middle of the through hole, and the remaining range is used as a space for relief of the crimped connection portion (wall relief). Therefore, the pressure which the connection part gives to another member which may occur when the connection part is connected by caulking or the like is suppressed. As a result, for example, the occurrence of deformation in a current collector or an electrode terminal having a through hole is suppressed.

  The power storage device according to one embodiment of the present invention includes a container that houses the electrode body and the current collector, a wall portion of the container between the current collector and the electrode terminal, and the current collector. And an insulating member disposed between at least one of the electrode terminals, and the cylindrical body may extend from the insulating member.

  According to this configuration, for example, the cylindrical body is arranged in the power storage element as a member formed integrally with the insulating member or as another member fixed to the insulating member. Therefore, for example, manufacturing (assembly) of the storage element can be efficiently performed.

  Moreover, the cylindrical body extended from the insulating member can be made to function also as a positioning member with respect to the container of the electrical power collector or electrode terminal which has a through-hole. As a result, for example, a storage element can be manufactured with high accuracy.

  In the energy storage device according to one embodiment of the present invention, the insulating member includes an upper insulating member disposed between the electrode terminal and the wall portion of the container, and the current collector and the container. A lower insulating member disposed between the wall portion, the cylindrical body extending from one of the upper insulating member and the lower insulating member, and the wall portion, the upper insulating member, and The lower insulating member may be disposed so as to pass through the other.

  According to this configuration, the cylinder can also function as, for example, the other positioning member for one of the upper insulating member and the lower insulating member. As a result, for example, a storage element can be manufactured with high accuracy.

  Further, in the storage element according to one aspect of the present invention, the inner circumferential surface of the hole of the cylindrical body is tapered such that the inner diameter increases as it approaches the opening of the end portion inserted into the through hole. It may be

  That is, as a result of the radially expanded connection portion in the connection step such as caulking acting to radially spread the inner peripheral surface of the hole of the cylinder, the inner peripheral surface becomes tapered, for example, the cylinder And the airtightness with the member (container etc.) around a cylinder is improved.

  The method for manufacturing a power storage device according to one embodiment of the present invention includes an electrode body, a current collector connected to the electrode body, an electrode terminal, and one of the current collector and the electrode terminal. A storage device comprising a connecting portion and a cylindrical body having a hole through which the connecting portion is inserted, the step of inserting the connecting portion into the hole of the cylindrical body, By inserting the axial end of the cylindrical body into a through hole provided in the other of the current collector and the electrode terminal, the cylindrical body is made to the other of the current collector and the electrode terminal. And disposing an end of the connection portion through the through hole.

  According to this manufacturing method, at least a part of the cylindrical body having the hole through which the connection portion extended from one of the current collector and the electrode terminal is inserted is inserted into the through hole. Furthermore, the end of the connection portion which penetrates the through hole is crimped.

  That is, for example, in the step of crimping the end of the connection portion, the cylindrical body can be used as the other positioning member of the current collector and the electrode terminal. Therefore, for example, occurrence of a defect due to the connection step such as caulking to the connection portion being performed in a state where the current collector or the electrode terminal is deviated from the normal position is suppressed. As described above, according to the method of manufacturing the storage element of this aspect, the storage element includes the connection portion connecting the current collector and the electrode terminal by caulking, and the storage element having high reliability is manufactured. be able to.

  Further, in the method for manufacturing an energy storage device according to one aspect of the present invention, in the step of arranging the cylinder, the insertion length of the cylinder into the through hole is longer than the axial length of the through hole. In the short state, the cylindrical body may be disposed with respect to the other of the current collector and the electrode terminal.

  According to this manufacturing method, the axial presence range of the cylindrical body in the through hole is in the middle of the through hole, and the remaining range can be used as a space for relief of the crimped connection portion (a meat escape). it can. Therefore, the pressure which the connection part gives to another member which may occur when the connection part is connected by caulking or the like is suppressed. As a result, for example, the occurrence of deformation in a current collector or an electrode terminal having a through hole is suppressed.

  Further, in the method of manufacturing the storage element according to one aspect of the present invention, the inner circumferential surface of the hole of the cylinder has a tapered surface whose inner diameter increases as it approaches the opening of the end portion inserted into the through hole. In the step of caulking the end portion of the connecting portion that is formed, the end portion that is inserted through the hole of the cylindrical body and penetrates the through hole may be caulked.

  According to this manufacturing method, for example, when the caulking is performed, the flare of the connecting portion is smoothly performed using the tapered surface. Further, for example, the adhesion between the connection portion and the other of the current collector and the electrode terminal in the crimped result is secured, so that the connection between the connection portion and the other can be conducted by the space used for the metal escape. Inhibition is suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, it is an electrical storage element provided with the connection part which connects a collector and an electrode terminal by being crimped, Comprising: A reliable electrical storage element 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 perspective view which isolate | separates the container main body of the container of the electrical storage element which concerns on embodiment, and shows each component with which an electrical storage element is equipped. It is a disassembled perspective view which shows each component at the time of decomposing the electrical storage element which concerns on embodiment. It is a disassembled perspective view which shows the cylinder of the electrical storage element which concerns on embodiment, and the structure of the periphery of it. FIG. 3 is a first cross-sectional view showing a structure of a cylindrical body and the periphery of the electric storage element according to the embodiment. FIG. 6 is a second cross-sectional view corresponding to FIG. 5; It is sectional drawing which shows the cylinder of the electrical storage element which concerns on the modification 1 of embodiment, and the structure of the periphery of it. It is sectional drawing which shows the cylinder of the electrical storage element which concerns on the modification 2 of embodiment, and the structure of the periphery of it. It is sectional drawing which shows the cylinder of the electrical storage element which concerns on the modification 3 of embodiment, and the structure of the periphery of it.

  Hereinafter, a storage element according to an embodiment of the present invention will be described with reference to the drawings. Each figure is a schematic view and is not necessarily strictly illustrated.

  In addition, the embodiment described below and the modifications thereof all show a comprehensive or specific example. The numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of the constituent elements and the like shown in the following embodiments and modifications are merely examples, and are not intended to limit the present invention. Moreover, among the components in the following embodiment and modification, components not described in the independent claim showing the highest level concept are described as optional components.

  Further, in the following description and drawings, the winding axis direction of the electrode body of the storage element is defined as the X-axis direction. That is, the X-axis direction can be defined as the direction in which the current collectors or the electrode terminals are arranged, or the opposing direction of the short side surfaces of the container. Further, the vertical direction of the storage element is defined as the Z-axis direction. That is, the Z-axis direction can be defined as the direction in which the legs of the current collector extend, or the longitudinal direction of the short side of the container. Further, a direction intersecting the X-axis direction and the Z-axis direction is defined as a Y-axis direction. That is, the Y-axis direction can be defined as the opposite 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.

  FIG. 1 is a perspective view showing an appearance of a storage element 10 according to the embodiment. FIG. 2 is a perspective view showing components included in the electricity storage device 10 by separating the container body 111 of the container 100 of the electricity storage device 10 according to the embodiment. FIG. 3 is an exploded perspective view showing each component when the storage element 10 according to the embodiment is disassembled. In addition, illustration of the container main body 111 of the container 100 is abbreviate | omitted in FIG.

  The storage element 10 is a storage element including an electrode body, a current collector connected to the electrode body, and an electrode terminal. Further, the storage element 10 further includes a connection portion for connecting the current collector and the electrode terminal by being crimped. Specifically, storage element 10 according to the present embodiment is described as follows.

  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. In particular, the electric storage element 10 is applied to an electric vehicle (EV), a plug-in hybrid electric vehicle (PHEV), or a hybrid electric vehicle (HEV). 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.

  As shown in these drawings, the electricity storage device 10 includes a container 100, a positive electrode terminal 200, and a negative electrode terminal 300. Further, inside the container 100, a positive electrode current collector 120, a negative electrode current collector 130, and two electrode bodies 141 and 142 are accommodated. The positive electrode terminal 200 is provided with a rivet portion 230 that is an example of a connection portion, and the negative electrode terminal 300 is provided with a rivet portion 330 that is an example of a connection portion.

  The power storage element 10 further includes at least one of a positive electrode current collector 120 and a positive electrode terminal 200, and a wall portion (a cover plate 110 in the present embodiment) that forms a side surface of the container 100 where the positive electrode current collector 120 is disposed. And an insulating member 250 disposed between the two. Similarly, on the negative electrode side, an insulating member 350 disposed between at least one of the negative electrode current collector 130 and the negative electrode terminal 300 and the lid plate 110 of the container 100 is provided.

  In the present embodiment, each of the insulating members 250 and 350 has an insulating member arranged up and down across the cover plate 110. Specifically, the insulating member 250 includes an upper insulating member 240 and a lower insulating member 150, and the insulating member 350 includes an upper insulating member 340 and a lower insulating member 160.

  The upper insulating member 240 is a member disposed between the positive electrode terminal 200 and the lid plate 110, and the lower insulating member 150 is a member disposed between the positive electrode current collector 120 and the lid plate 110. The upper insulating member 340 is a member disposed between the negative electrode terminal 300 and the lid plate 110, and the lower insulating member 160 is a member disposed between the negative electrode current collector 130 and the lid plate 110. The upper insulating members 240 and 340 and the lower insulating members 150 and 160 are manufactured, for example, by molding a resin having an insulating property.

  In the present embodiment, the cover plate 110 of the container 100, the electrode terminals (200, 300) and the current collectors (120, 130) are electrically insulated by the insulating members 250 and 350 configured in this manner. ing.

  The upper insulating members 240 and 340 may be called, for example, an upper packing, and the lower insulating members 150 and 160 may be called, for example, a lower packing. That is, in the present embodiment, each of the insulating members 250 and 350 also has a function of sealing between the electrode terminal (200 or 300) and the container 100.

  In addition, a liquid such as an electrolytic solution (non-aqueous electrolytic solution) is sealed inside the container 100 of the electricity storage element 10, but the illustration of the liquid is omitted. The type of the electrolytic solution sealed in the container 100 is not particularly limited as long as it does not impair the performance of the storage element 10, and various types can be selected.

  The container 100 includes a container body 111 having a rectangular cylindrical shape and a bottom, and a lid plate 110 that closes an opening of the container body 111. Further, the container 100 can seal the inside by welding the lid plate 110 and the container body 111 after the electrode bodies 141 and 142 and the like are accommodated therein. The material of the lid plate 110 and the container body 111 is not particularly limited, but is preferably a weldable metal such as stainless steel, aluminum, aluminum alloy, for example.

  The cover plate 110 is provided with a safety valve 110c for releasing the gas generated in the container 100 and releasing the pressure when the pressure in the container 100 rises. In addition, the lid plate 110 is formed with an opening 110 a into which a rivet portion 230 extending from the positive electrode terminal 200 is inserted, and an opening 110 b into which a rivet portion 330 extending from the negative electrode terminal 300 is inserted. ing.

  The electrode bodies 141 and 142 are two power generation elements arranged in parallel, and both are electrically connected to the positive electrode current collector 120 and the negative electrode current collector 130. In the present embodiment, the electrode body 141 and the electrode body 142 have the same configuration.

  Specifically, the electrode bodies 141 and 142 include a positive electrode, a negative electrode, and a separator, and are members that can store electricity. In the positive electrode, a positive electrode active material layer is formed on a positive electrode base material layer which is a long strip-shaped metal foil made of aluminum or an aluminum alloy. Further, the negative electrode is obtained by forming a negative electrode active material layer on a negative electrode base material layer which is a long strip-like metal foil made of copper or copper alloy. The separator is a microporous sheet made of resin.

  As the positive electrode active material used for the positive electrode active material layer or the negative electrode active material layer used for the negative electrode active material layer, any known material can be used as long as it is a positive electrode active material or negative electrode active material capable of occluding and releasing lithium ions. .

  And the electrode bodies 141 and 142 are formed by winding what is arranged in layers so that the separator is sandwiched between the positive electrode and the negative electrode. 2 and 3, the electrode bodies 141 and 142 have an oval shape, but may have a circular shape or an oval shape.

  Here, in the electrode bodies 141 and 142, the positive electrode and the negative electrode are wound so as to be offset from each other in the direction of the winding axis (virtual axis parallel to the X-axis direction in this embodiment) via the separator. . Then, in the positive electrode and the negative electrode, the active material is not applied to the edge portion in the shifted direction, and the portion (uncoated portion) where the base material layer is exposed (the active material layer is not formed) Have. In addition, an uncoated part may be expressed also as a "active material layer non-formation part."

  Specifically, the electrode body 141 has an end portion 141a on the positive electrode side in which the uncoated portion of the positive electrode is laminated at one end in the winding axial direction (end on the positive side in the X-axis direction). Similarly, the electrode body 142 has an end 142 a on the positive electrode side where the uncoated portion of the positive electrode is laminated at the end on the positive side in the X-axis direction. Similarly, the electrode bodies 141 and 142 also have end portions on which negative electrode uncoated portions are laminated on the negative electrode side.

  In the present embodiment, the electrode bodies 141 and 142 are bundled by winding an insulating film 143 that is an insulating film around the periphery. The insulating film 143 is a rectangular sheet-like resin member and is fixed by being wound around the electrode bodies 141 and 142 and holding the end portion of the winding with the insulating tape 144.

  The number of electrode bodies included in the storage element 10 is not particularly limited, and may be one or three or more. When the storage element 10 has a plurality of electrode bodies (two electrode bodies 141 and 142 in the present embodiment), for example, the following may be compared to the case where a single electrode body is accommodated in the container 100 having the same volume (volume). It is preferable in point.

  That is, by using a plurality of electrode bodies, the dead space at the corner portion of the container 100 is reduced and the ratio occupied by the electrode bodies is improved as compared to the case where a single electrode body is used. Connect. In addition, particularly in the case of an electrode body for high input / output (high rate), it is necessary to reduce the amount of active material on the metal foil as compared to the high capacity type electrode body, and the ratio of metal foil and separator in the electrode body is Increase. Therefore, when a single electrode body is used, the number of turns of the electrode is increased, and as a result, the electrode is hard and has low flexibility, making it difficult to insert it into the container 100. However, when a plurality of electrode bodies are used, the number of turns in one electrode body can be reduced, so that a highly flexible electrode body can be realized. Thereby, it is possible to make the dead space in the container 100 relatively small.

  The positive electrode current collector 120 is disposed on the positive electrode side (X-axis direction plus side) of the electrode bodies 141 and 142, and is electrically connected to the positive electrode terminal 200 and the positive electrodes of the electrode bodies 141 and 142. It is a member provided with. Note that the positive electrode current collector 120 is formed of aluminum or an aluminum alloy as in the case of the positive electrode base material layers of the electrode bodies 141 and 142.

  Specifically, the positive electrode current collector 120 is connected to the positive electrode-side end portion 141 a and the end portion 142 a of the electrode bodies 141 and 142 by welding or the like, thereby being connected to the positive electrodes of the electrode bodies 141 and 142. In addition, the positive electrode current collector 120 has a through hole 120a, and the rivet portion 230 provided in the positive electrode terminal 200 is inserted into the through hole 120a and caulked, whereby the positive electrode current collector 120 and the positive electrode current collector 120 are The terminal 200 is connected.

  The negative electrode current collector 130 is disposed on the negative electrode side (X-axis direction negative side) of the electrode bodies 141 and 142, and is electrically and rigidly connected to the negative electrode terminal 300 and the negative electrodes of the electrode bodies 141 and 142. It is a member provided with. Note that the negative electrode current collector 130 is formed of copper or a copper alloy or the like, similarly to the negative electrode base material layers of the electrode bodies 141 and 142.

  Specifically, the negative electrode current collector 130 is connected to the negative electrodes of the electrode bodies 141 and 142 by joining the negative electrode side ends of the electrode bodies 141 and 142 by welding or the like. In addition, a through hole 130 a is formed in the negative electrode current collector 130, and the rivet portion 330 provided on the negative electrode terminal 300 is inserted into the through hole 130 a and crimped, whereby the negative electrode current collector 130 and the negative electrode are formed. The terminal 300 is connected.

  In the present embodiment, the cylinder extending from the insulating member 250 (350) is inserted partway through the through hole 120a (130a), and the rivet portion 230 (330) inserted through the cylinder. It is characterized in that it is crimped. This feature will be described later with reference to FIGS. 4 to 6.

  The positive electrode terminal 200 and the negative electrode terminal 300 lead the electricity stored in the electrode bodies 141 and 142 to the external space of the power storage element 10, and the internal space of the power storage element 10 to store the electricity in the electrode bodies 141 and 142. It is a metal electrode terminal for introducing electricity to the

  The positive electrode terminal 200 and the negative electrode terminal 300 are attached to a cover plate 110 disposed above the electrode bodies 141 and 142. Specifically, as shown in FIG. 3, the positive terminal 200 is provided with a rivet portion 230 that electrically connects the positive terminal 200 and the positive current collector 120.

  The rivet portion 230 is a member extending from the positive electrode terminal 200 and is inserted into the through hole 120 a of the positive electrode current collector 120 and caulked to thereby connect the positive electrode terminal 200 and the positive electrode current collector 120. It is. Specifically, rivet portion 230 is inserted into opening 240 a of upper insulating member 240, opening 110 a of lid plate 110, opening 150 a of lower insulating member 150, and through hole 120 a of positive electrode current collector 120. Squeezed. Thereby, the positive terminal 200 is fixed to the cover plate 110 together with the upper insulating member 240, the lower insulating member 150, and the positive electrode current collector 120.

  The rivet portion 330 is a member extended from the negative electrode terminal 300, and is inserted into the through hole 130 a of the negative electrode current collector 130 and crimped to connect the negative electrode terminal 300 and the negative electrode current collector 130. It is. Specifically, the rivet portion 330 is inserted into the opening 340 a of the upper insulating member 340, the opening 110 b of the cover plate 110, the opening 160 a of the lower insulating member 160, and the through hole 130 a of the negative electrode current collector 130. Squeezed. Thereby, the negative electrode terminal 300 is fixed to the cover plate 110 together with the upper insulating member 340, the lower insulating member 160 and the negative electrode current collector 130.

  Here, the rivet portion 230 may be formed as an integral part of the positive electrode terminal 200, and the rivet portion 230 created as a separate component from the positive electrode terminal 200 is formed on the positive electrode terminal 200 by a technique such as caulking or welding. It may be fixed. The same applies to the relationship between the rivet portion 330 and the negative electrode current collector 130.

  Next, the cylindrical body arranged to cover the outer periphery of the rivet portion 230 provided in the energy storage device 10 according to the present embodiment will be described in detail. Note that there is a cylindrical body arranged so as to cover the outer periphery of the rivet portion 330 on the negative electrode side, and the structure of the cylindrical body and its periphery is common to the positive electrode side and the negative electrode side. Therefore, in the following description, the positive electrode cylinder and its peripheral structure will be described, and the negative electrode cylinder and its peripheral structure will be omitted.

  FIG. 4 is an exploded perspective view showing a structure of a cylindrical body 241 and the periphery of the electric storage element 10 according to the embodiment. FIG. 5 is a first cross-sectional view showing a structure of the cylindrical body 241 and the periphery of the electric storage element 10 according to the embodiment. FIG. 6 is a second cross-sectional view corresponding to FIG.

  Specifically, FIG. 5 is a cross-sectional view showing the structure of the cylinder 241 and its surroundings before caulking of the rivet part 230, and FIG. 6 shows the structure of the cylinder 241 and its surroundings after caulking of the rivet part 230. It is sectional drawing which shows. 5 and 6, a part of the V-V cross section in FIG. 2 is illustrated.

  As shown in FIGS. 4 to 6, the electricity storage device 10 includes a cylinder 241 having a hole 241 a through which the rivet portion 230 is inserted, and a cylinder 241 in which an end in the axial direction is inserted into the through hole 120 a. . The axial direction of the rivet portion 230 and the axial direction of the through hole 120a are both the Z-axis direction in the present embodiment. In the present embodiment, the upper end of the hole 241 a of the cylindrical body 241 is connected to the opening 240 a of the upper insulating member 240.

  Moreover, the insertion length to the through-hole 120a of the cylinder 241 is shorter than the length of the through-hole 120a in the axial direction. Specifically, as shown in FIG. 5, before the rivet portion 230 is crimped, the insertion length L1 of the cylindrical body 241 into the through hole 120a is shorter than the axial length T of the through hole 120a. Furthermore, as shown in FIG. 6, after the rivet portion 230 is crimped, the insertion length L2 of the cylindrical body 241 into the through hole 120a is shorter than the axial length T of the through hole 120a.

  More specifically, in the present embodiment, one end of the rivet portion 230 is passed through the through-hole 120a of the positive electrode current collector 120, and the one end is caulked to thereby form the positive electrode terminal 200 and the positive electrode current collector. And 120 are connected. Further, the insertion length (L 1, L 2) of the cylindrical body 241 into the through hole 120 a is shorter than the thickness (T) of the portion of the positive electrode current collector 120 where the through hole 120 a is provided. For example, when T is 2 mm, L1 is about 1 mm, and L2 is 1 mm or more and less than 2 mm.

  That is, as shown in FIG. 5 and FIG. 6, the existence range of the cylindrical body 241 in the through hole 120a is up to the middle of the through hole 120a, and the space S corresponding to the remaining range is expanded by being crimped. It is used as a space for relief (meat relief) of the rivet portion 230.

  Therefore, the pressure on the members around the rivet portion 230, which may be caused by the rivet portion 230 being crimped, is suppressed. As a result, for example, the occurrence of deformation in the positive electrode current collector 120 having the through holes 120 a or the insulating member 250 is suppressed.

  Here, the portion of the positive electrode current collector 120 where the through holes 120a are formed is surrounded by the peripheral wall 151 of the lower insulating member 150, for example, to improve the reliability of the electrical insulation (FIG. 5). And Figure 6). Therefore, when the portion of the positive electrode current collector 120 extends in a direction parallel to the XY plane due to the caulking force when the rivet portion 230 is caulked, the peripheral wall portion 151 may be compressed by the portion. . However, as described above, since the space S used for the heat escape of the rivet portion 230 is formed inside the through hole 120 a, the deformation of the positive electrode current collector 120 is suppressed, and as a result, the lower insulating member 150. Unnecessary power is suppressed.

  The portion of the cylindrical body 241 inserted into the through-hole 120a is pressed by the rivet portion 230 expanding when the rivet portion 230 is caulked, thereby causing the cylindrical body 241 to move in the axial direction. In some cases, the insertion length increases (the insertion length increases from L1 to L2). That is, a part of the space S existing inside the through hole 120a before caulking the rivet portion 230 may be used as a space for the meat escape of the cylinder 241 itself. However, even in this case, with respect to the deformation of the cylindrical body 241, the radial pressing force due to the rivet portion 230 expanding in the radial direction becomes dominant, and the insertion length L2 of the cylindrical body 241 after caulking is: It does not exceed the length of the through hole 120a (the thickness T of the positive electrode current collector 120). Further, by pressing the cylindrical body 241 so as to be expanded in the radial direction, for example, adhesion between the cylindrical body 241 and the inner surface of the through hole 120a and the inner surface of the opening 150a of the lower insulating member 150 is improved. . Thereby, the airtightness in the part of the cylinder 241 of the container 100 is improved, for example.

  Here, when the rivet portion 230 is caulked, it is also conceivable to increase the inner diameter of the through hole 120a without arranging the cylindrical body 241 so that the portion where the through hole 120a is formed is not deformed. However, in this case, for example, so-called “play” increases between the rivet portion 230 and the positive electrode current collector 120 having the through hole 120a. As a result, for example, there arises a problem of how to position the positive electrode current collector 120 at the time of manufacturing the power storage element 10.

  In that respect, in the electricity storage device 10 according to the present exemplary embodiment, a part of the cylindrical body 241 through which the rivet portion 230 is inserted is inserted into the through hole 120a of the positive electrode current collector 120, and the meat of the rivet portion 230 is inserted. There is a space S that is used as an escape space. The cylindrical body 241 extends from the insulating member 250 attached to the container 100. Therefore, the cylindrical body 241 can function as a positioning member for the container 100 with respect to the container 100 while suppressing deformation of the positive electrode current collector 120 by the space S formed by the presence of the cylindrical body 241. As a result, for example, the power storage element 10 can be manufactured with high accuracy.

  Further, since the cylindrical body 241 is a member fixed to the insulating member 250, for example, the arrangement of the cylindrical body 241 in the container 100 is also completed by the arrangement of the insulating member 250 in the container 100. This is advantageous, for example, for increasing the efficiency of manufacturing the power storage element 10.

  Moreover, the case where the rivet part 230 contacts the inner surface of the opening part 150a of the lower insulating member 150 without using the cylinder 241 is assumed. In this case, when the rivet portion 230 is caulked to expand in the radial direction, there is a possibility that damage such as cracking may occur in the peripheral edge of the opening 150 a of the lower insulating member 150 due to the force received from the rivet portion 230. is there. When such damage occurs in the power storage element 10, the power storage element 10 is disposed of as a defective product before shipment, for example.

  In that respect, in the storage element 10 according to the present embodiment, the cylindrical body 241 is disposed so as to cover the outer periphery of the rivet portion 230, and as described above, a part of the space S (see FIG. 5) It is used as a space for fleshing the cylinder 241. Therefore, the occurrence of damage to the lower insulating member 150 due to the rivet portion 230 being caulked is suppressed.

  Furthermore, in the present embodiment, as shown in FIGS. 4 to 6, the cylindrical body 241 is extended from the upper insulating member 240 and penetrates the lid plate 110 of the container 100 and the lower insulating member 150. It is arranged in the state of Therefore, the cylindrical body 241 can function as the other positioning member with respect to one of the upper insulating member 240 and the lower insulating member 150, for example. This is advantageous for accurate manufacture of the electricity storage device 10.

  Further, since the end portion of the rivet portion 230 extending from the positive electrode terminal 200 is caulked in a state of passing through the through hole 120a of the positive electrode current collector 120, for example, the surface of the positive electrode terminal 200 (the upper surface in FIG. ) Can be formed flat. As a result, for example, the area where the positive electrode terminal 200 can be bonded to a conductive member such as a bus bar is increased.

  In the present embodiment, as shown in FIG. 5, the inner diameter of the inner peripheral surface of the hole 241a of the cylindrical body 241 increases toward the opening of the end inserted into the through hole 120a before caulking. A tapered surface 241b is formed. That is, in the step of caulking the end portion of the rivet portion 230, the end portion that is inserted into the hole 241a having the tapered surface 241b formed in the vicinity of the opening and penetrates the through hole 120a is caulked. As a result, for example, during the caulking, the rivet portion 230 is smoothly evacuated using the tapered surface 241b. Further, for example, adhesion between the rivet portion 230 and the positive electrode current collector 120 after caulking is ensured. Therefore, it is suppressed that the conduction | electrical_connection with the rivet part 230 and the positive electrode collector 120 is inhibited by the space S utilized for the metal escape of the rivet part 230. FIG.

  Further, in the present embodiment, as shown in FIG. 6, after caulking, the inner peripheral surface of the hole 241a of the cylindrical body 241 is tapered such that the inner diameter spreads closer to the opening of the end portion inserted into the through hole 120a. It has become. That is, as a result of the rivet portion 230 that has expanded in the radial direction in the caulking process acting so as to expand the inner peripheral surface of the hole 241a of the cylindrical body 241 in the radial direction, the inner peripheral surface becomes a tapered shape. The airtightness between 241 and the cover plate 110 is improved.

  In addition, the manufacturing method of the electrical storage element 10 according to the present embodiment includes, for example, the following steps. That is, the electrode bodies 141 and 142, the positive electrode current collector 120 connected to the electrode bodies 141 and 142, the positive electrode terminal 200, and the rivet portion 230 extending from one of the positive electrode current collector 120 and the positive electrode terminal 200, A method of manufacturing the storage element 10 including the cylindrical body 241 having the hole 241 a through which the rivet portion 230 is inserted, and inserting the rivet portion 230 into the hole 241 a of the cylindrical body 241; A cylindrical body is obtained by inserting the end portion in the axial direction of 241 into a through hole provided in the other of the positive electrode current collector 120 and the positive electrode terminal 200 (in this embodiment, the through hole 120a of the positive electrode current collector 120). And a step of disposing the end portion of the rivet portion 230 through the through hole 120a.

  Specifically, in the step of arranging the cylindrical body 241, the cylindrical body 241 is inserted in a state in which the insertion length of the cylindrical body 241 into the through hole 120a is shorter than the axial length (T) of the through hole 120a. Is disposed with respect to the other of the positive electrode current collector 120 and the positive electrode terminal 200.

  More specifically, for example, the following example work is performed. The upper insulating member 240 is disposed so that the cylindrical body 241 is inserted into the opening 110a (see FIG. 3) of the lid plate 110, and the positive terminal 200 is inserted so that the rivet section 230 is inserted into the cylindrical body 241 in that state. Is placed. Further, the lower insulating member 150 is disposed such that these members are integrally turned upside down and the cylindrical body 241 is inserted into the opening 150 a of the lower insulating member 150. Thereafter, the end of the cylindrical body 241 exposed from the lower insulating member 150 is inserted into the through hole 120 a of the positive electrode current collector 120, and the end of the rivet portion 230 passing through the through hole 120 a is crimped.

  Here, if the step of inserting the rivet portion 230 into the hole 241a and the step of arranging the cylindrical body 241 are executed before the step of caulking the end portion of the rivet portion 230, which is the first step. May be executed simultaneously, or may be executed simultaneously. That is, whether or not the rivet portion 230 is inserted into the hole 241a of the cylindrical body 241 when performing the step of arranging the cylindrical body 241 with respect to the other of the positive electrode current collector 120 and the positive electrode terminal 200. It may be any.

  As described above, in the storage element 10 according to the present embodiment, a part of the cylindrical body 241 through which the rivet portion 230 is inserted is inserted into the through hole 120 a of the positive electrode current collector 120. Therefore, for example, the cylindrical body 241 can be used as a positioning member of the positive electrode current collector 120 in the manufacturing process of the power storage element 10. Therefore, for example, occurrence of a defect due to the rivet portion 230 being crimped is suppressed while the positive electrode current collector 120 is shifted from the normal position.

  Therefore, the power storage device 10 according to the present embodiment is a power storage device 10 including a connection portion (rivet portion 230) that connects the positive electrode current collector 120 and the positive electrode terminal 200, and is a highly reliable power storage device 10. is there.

  In the present embodiment, for example, the insertion length of the cylindrical body 241 into the through hole 120a (the length inserted into the through hole 120a of the cylindrical body 241 (see FIG. 6 is shorter than the length of the through hole 120a in the axial direction. That is, the cylindrical body 241 is inserted to the middle of the through hole 120a, and the remaining range (space S) is used as a space for escape of the caulked rivet portion 230.

  Therefore, the pressure with respect to the member of the periphery of the rivet part 230 which may arise when the rivet part 230 is caulked is suppressed. As a result, for example, the occurrence of deformation in the positive electrode current collector 120 having the through hole 120a is suppressed. Further, the deformation or damage of the insulating member 250 through which the rivet portion 230 passes is suppressed.

  In addition, the cylinder 241 may be extended from the lower insulating member 150, for example. Further, the connection portion connecting the positive electrode current collector 120 and the positive electrode terminal 200 may be extended from the positive electrode current collector 120 in the direction of the positive electrode terminal 200. That is, the structure of the cylindrical body 241 and its periphery in the electricity storage element 10 may be a structure other than the structure shown in FIGS. Therefore, various modified examples of the cylindrical body 241 and its peripheral structure in the electricity storage element 10 will be described focusing on differences from the above embodiment.

(Modification 1)
FIG. 7 is a cross-sectional view showing the structure of cylindrical body 155 and its periphery of power storage element 10a according to Modification 1 of the embodiment. In addition, the cross-sectional view shown in FIG. 7 is a figure which shows a part of cross section corresponded to the VV cross section in FIG. The same applies to FIGS. 8 and 9 described later.

  In a storage element 10a according to the first modification of the embodiment shown in FIG. 7, a cylindrical body 155 is extended from the insulating member 250, and in this point, it is common to the storage element 10 according to the above embodiment. However, in the storage element 10 a according to the first modification, the cylindrical body 155 is different from the storage element 10 according to the above-described embodiment in that the cylindrical body 155 is extended from the lower insulating member 150.

  Even in this case, the insertion length L2 of the cylindrical body 155 into the through hole 120a is shorter than the axial length T of the through hole 120a. That is, the axial range of the cylindrical body 155 in the through hole 120a is up to the middle of the through hole 120a, and the remaining range (space S (see FIG. 5; the same applies hereinafter)) is the caulking rivet portion 230. It is used as a space for meat escape. Therefore, for example, the occurrence of deformation in the positive electrode current collector 120 having the through hole 120a is suppressed. Further, the deformation or damage of the insulating member 250 through which the rivet portion 230 passes is suppressed.

  Also, for example, if the lower insulating member 150 is disposed on the lid plate 110 and the rivet portion 230 is inserted through the hole 155 a of the cylindrical body 155, the positioning function of the positive electrode current collector 120 by the cylindrical body 155 Is also exhibited.

  Further, in the present modification, the cylindrical body 155 has a portion which penetrates the opening 110a (see FIG. 3) of the lid plate 110 and is inserted into the opening 240a (see FIG. 3) of the upper insulating member 240. There is. That is, the lower insulating member 150 according to this modification has a cylindrical body 155 that extends in both the upper and lower directions. In this case, the cylindrical body 155 also functions as a member that insulates the rivet portion 230 and the cover plate 110 from the cylindrical body 241 according to the above embodiment. Further, the cylindrical body 155 functions not only as a positioning of the positive electrode current collector 120 but also as a member for positioning the upper insulating member 240.

  Therefore, the power storage element 10a according to the present modification is a power storage element 10a including the rivet portion 230 that connects the positive electrode current collector 120 and the positive electrode terminal 200, and is a highly reliable power storage element 10a.

(Modification 2)
FIG. 8 is a cross-sectional view showing a structure of cylindrical body 156 and its periphery of power storage element 10b according to Modification 2 of the embodiment. In the electric storage element 10b according to the second modification of the embodiment shown in FIG. 8, the rivet portion 125 is inserted through the hole 156a of the cylinder 156, and the cylinder 156 is disposed in a state of penetrating the lid plate 110. ing. In this point, it is common to the storage element 10 according to the above embodiment. However, in the electricity storage device 10b according to the modified example 2, the cylindrical body 156 is partially inserted into the through-hole 200a provided in the positive electrode terminal 200, and the electricity storage device 10b according to the above embodiment is different from the electricity storage device 10b according to the second embodiment. Is different.

  Further, in this modification, the rivet portion 125 that is a connecting portion that connects the positive electrode current collector 120 and the positive electrode terminal 200 extends from the positive electrode current collector 120, and the cylindrical body 156 has a lower insulation. The member 150 extends in the direction of the positive electrode terminal 200. That is, to put it simply, in the electric storage device 10b according to the present modification, the structure of the cylindrical body 156 and the periphery thereof is opposite to the structure (see, for example, FIG. 6) in the above embodiment.

  Even in this case, the insertion length of the cylindrical body 156 into the through hole 200 a is shorter than the thickness of the portion of the positive electrode terminal 200 provided with the through hole 200 a. Specifically, as shown in FIG. 8, the insertion length L2 of the cylindrical body 156 into the through hole 200 a is shorter than the thickness T of the portion of the positive electrode terminal 200 provided with the through hole 200 a.

  That is, the axial range of the cylindrical body 156 in the through-hole 200a is up to the middle of the through-hole 200a, and the remaining range is used as a space for escape of the caulked rivet portion 125. Therefore, for example, the occurrence of deformation in the positive electrode terminal 200 having the through hole 200a is suppressed. As a result, since distortion of the surface (upper surface in FIG. 8) of positive electrode terminal 200 is suppressed, for example, bonding (for example, ultrasonic welding) between the surface and a conductive member such as a bus bar can be performed accurately. . Further, the deformation or damage of the insulating member 250 through which the rivet portion 125 passes is suppressed.

  Furthermore, for example, since the cylindrical body 156 is inserted into the through hole 200 a of the positive electrode terminal 200, the positive electrode terminal 200 positioning function by the cylindrical body 156 is also exhibited. Further, a cylinder 156 extending from the lower insulating member 150 passes through the upper insulating member 240. Therefore, the cylindrical body 241 also functions as a positioning member for one of the lower insulating member 150 and the upper insulating member 240.

  Further, for example, the crimped end portion of the rivet portion 125 that is a connection portion does not exist on the positive electrode current collector 120 side. As a result, for example, the ratio that can be used as the arrangement space of the electrode bodies 141 and 142 in the container 100 can be increased. This is advantageous, for example, from the viewpoint of increasing the storage capacity of the storage element 10b.

  Therefore, the power storage element 10b according to the present modification is a power storage element 10b including the rivet portion 125 that connects the positive electrode current collector 120 and the positive electrode terminal 200, and is a highly reliable power storage element 10b.

(Modification 3)
FIG. 9 is a cross-sectional view showing a structure of cylindrical body 246 and its periphery of power storage element 10c according to Modification 3 of the embodiment. In the storage element 10 c according to the third modification of the embodiment shown in FIG. 9, the rivet portion 125 is extended in the direction from the positive electrode current collector 120 to the positive electrode terminal 200. Further, in the storage element 10c, the cylindrical body 246 is extended from the upper insulating member 240.

  Specifically, a rivet portion 125 extending from the positive electrode current collector 120 is inserted into a hole 246a of the cylindrical body 246 extending from the upper insulating member 240 and a part of the cylindrical body 246 is inserted. Is inserted into a through hole 200 a provided in the positive electrode terminal 200. Further, the end portion of the rivet portion 125 passing through the through hole 200a of the positive electrode terminal 200 is caulked.

  Even in this case, the insertion length L2 of the cylindrical body 246 into the through hole 200a is shorter than the axial length T of the through hole 200a. In other words, the axial range of the cylindrical body 246 in the through hole 200a is up to the middle of the through hole 200a, and the remaining range is used as a space for escape of the caulked rivet portion 125. Therefore, for example, the occurrence of deformation in the positive electrode terminal 200 having the through hole 200a is suppressed. Further, the deformation or damage of the insulating member 250 through which the rivet portion 125 passes is suppressed.

  In addition, for example, when the upper insulating member 240 is disposed on the lid plate 110 and the rivet portion 125 is inserted through the hole 246 a of the cylindrical body 246, the positioning function of the positive electrode terminal 200 by the cylindrical body 246 is also exhibited. Be done.

  Further, since the crimped end portion of the rivet portion 125 does not exist on the positive electrode current collector 120 side, the effect of increasing the storage capacity can be obtained as in the storage element 10b according to the second modification.

  Further, in the present modification, the cylindrical body 246 has a portion which penetrates the opening 110a (see FIG. 3) of the lid plate 110 and is inserted into the opening 150a (see FIG. 3) of the lower insulating member 150. There is. That is, the upper insulating member 240 according to this modification has a cylindrical body 246 that extends in both the up and down directions. In this case, the cylindrical body 246 also functions as a member that insulates the rivet portion 125 and the lid plate 110 from the cylindrical body 241 according to the above embodiment. Further, the cylindrical body 246 functions not only as a positioning of the positive electrode terminal 200 but also as a member for positioning the lower insulating member 150.

  Therefore, the power storage element 10c according to the present modification is a power storage element 10c including the rivet portion 125 that connects the positive electrode current collector 120 and the positive electrode terminal 200, and is a highly reliable power storage element 10c.

(Others)
In the above, the electrical storage element which concerns on this invention was demonstrated based on embodiment and its modification. However, the present invention is not limited to the embodiment and the modification thereof. Without departing from the spirit of the present invention, various modifications conceived by those skilled in the art may be applied to the embodiment or its modifications, or a structure constructed by combining a plurality of the above-described constituent elements may be applied to the present invention. It is included in the range.

  For example, the cylindrical body 241 included in the power storage element 10 may be arranged as a separate component from the insulating member 250. For example, after fixing or temporarily fixing the cylindrical body 241 which is a separate component to the upper insulating member 240 to the upper insulating member 240, for example, as shown in FIG. Even in this case, for example, the airtightness between the cylindrical body 241 and the upper insulating member 240 is secured by the pressure of the rivet portion 230 which expands by being crimped.

  The power storage element 10 may not include the lower insulating member 150 that is a part of the insulating member 250, for example. In this case, the container 100 can be brought to the same potential as the positive electrodes of the electrode bodies 141 and 142 by electrically connecting the positive electrode current collector 120 and the lid plate 110.

  Moreover, although a rivet was illustrated as a connection part which connects the positive electrode terminal 200 and the positive electrode collector 120 in the said embodiment and each modification, a connection part may be implement | achieved other than a rivet. For example, a rod (male thread) in which a screw thread is formed on at least a part of the outer peripheral surface may be adopted as a connection portion extended from the positive electrode terminal 200 or the positive electrode current collector 120.

  For example, in the above embodiment, the male screw extended from the positive electrode terminal 200 is inserted into the cylindrical body 241 and penetrates the through hole 120a of the positive electrode current collector 120, and in this state, the male screw and the nut And the nut may be tightened. That is, the positive electrode terminal 200, the insulating member 250, and the positive electrode current collector 120 may be fixed to the lid plate 110 by tightening a nut screwed with the male screw. Even in this case, for example, the positive electrode current collector 120 can be positioned by the cylindrical body 241 in the fixing step. As a result, for example, a defect such as deformation of the positive electrode current collector 120 caused by tightening of the nut in a state where the positive electrode current collector 120 is deviated from the normal position is suppressed. In addition, for example, a space S (see FIG. 5) formed in the vicinity of the tip of the cylindrical body 241 is used as a space for relief of the positive electrode current collector 120 pressed by the nut.

  Furthermore, the cylindrical body such as the cylindrical body 241 does not need to be disposed corresponding to each of the positive electrode terminal 200 and the negative electrode terminal 300, for example, disposed corresponding to only one of the positive electrode terminal 200 and the negative electrode terminal 300. It may be done.

  For example, the structures of the electrode bodies 141 and 142 included in the power storage element 10 may not be a winding type, and may be a structure in which flat positive electrodes and negative electrodes are alternately stacked with separators interposed therebetween. The electrode bodies 141 and 142 may have a structure in which a long strip-shaped positive electrode and a negative electrode are folded in a bellows shape with a separator interposed therebetween.

  In addition, although the positive electrode terminal 200 and the negative electrode terminal 300 have a flat surface, for example, as shown in FIG. 1, the shape of the positive electrode terminal 200 or the negative electrode terminal 300 is not particularly limited. For example, a rod having a screw thread formed on the outer peripheral surface may be provided to the positive electrode terminal 200 integrally with the positive electrode terminal 200 or as a separate member from the positive electrode terminal 200. In this case, a conductive member such as a bus bar can be fastened to the positive electrode terminal 200 using a nut.

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

10, 10a, 10b, 10c Storage Element 100 Container 110 Lid Plate 110a, 110b, 150a, 160a, 240a, 340a Opening 110c Safety Valve 111 Container Body 120 Positive Current Collector 120a, 130a, 200a Through Hole 125, 230, 330 Rivet Part 130 Negative electrode current collector 141, 142 Electrode body 141a, 142a End part 143 Insulating film 144 Insulating tape 150, 160 Lower insulating member 151 Peripheral wall part 155, 156, 241, 246 Tube body 155a, 241a, 246a, hole 200 Positive terminal 240, 340 Upper insulating member 241b Tapered surface 250, 350 Insulating member 300 Negative terminal

Claims (6)

A storage element comprising an electrode body, a current collector connected to the electrode body, and an electrode terminal,
A connecting portion extended from one of the current collector and the electrode terminal, which penetrates a through hole provided in the other of the current collector and the electrode terminal, and an end is connected to the other A connection portion electrically connecting the current collector and the electrode terminal;
A cylindrical body having a hole for inserting the connecting portion, e Bei an axial end portion inserted cylindrical body in the through hole,
The insertion length of the cylindrical body into the through hole is shorter than the axial length of the through hole,
Power storage element. A storage element comprising an electrode body, a current collector connected to the electrode body, and an electrode terminal,
A connecting portion extended from one of the current collector and the electrode terminal, which penetrates a through hole provided in the other of the current collector and the electrode terminal, and an end is connected to the other A connection portion electrically connecting the current collector and the electrode terminal;
A cylindrical body having a hole for inserting the connecting portion, e Bei an axial end portion inserted cylindrical body in the through hole,
The inner peripheral surface of the hole of the cylindrical body has a tapered shape in which the inner diameter increases as it approaches the opening of the end inserted into the through hole .
Power storage element. A container for housing the electrode body and the current collector;
It has a wall portion of the container between the current collector and the electrode terminal, and an insulating member disposed between at least one of the current collector and the electrode terminal.
The cylindrical body extends from the insulating member,
The electrical storage element of Claim 1 or 2. The insulating member is an upper insulating member disposed between the electrode terminal and the wall of the container, and a lower insulating member disposed between the current collector and the wall of the container. Have
The cylindrical body extends from one of the upper insulating member and the lower insulating member, and is disposed so as to penetrate the other of the wall portion and the upper insulating member and the lower insulating member.
The electricity storage device according to claim 3. A cylinder having an electrode body, a current collector connected to the electrode body, an electrode terminal, a connection portion extended from one of the current collector and the electrode terminal, and a hole through which the connection portion is inserted A manufacturing method for manufacturing a storage element comprising
Inserting the connection portion into the hole of the cylinder;
By inserting the axial end of the cylindrical body into the through hole provided in the other of the current collector and the electrode terminal, the cylindrical body is opposed to the other of the current collector and the electrode terminal. And arranging the process,
The step of caulking the end of the connection portion through the through hole ;
In the step of arranging the cylindrical body, the cylindrical body includes the current collector and the electrode in a state where the insertion length of the cylindrical body into the through hole is shorter than the axial length of the through hole. Arranged against the other of the terminals,
A method for manufacturing a storage element. A cylinder having an electrode body, a current collector connected to the electrode body, an electrode terminal, a connection portion extended from one of the current collector and the electrode terminal, and a hole through which the connection portion is inserted A manufacturing method for manufacturing an electricity storage device comprising:
Inserting the connecting portion into the hole of the cylindrical body;
By inserting the axial end of the cylindrical body into the through hole provided in the other of the current collector and the electrode terminal, the cylindrical body is opposed to the other of the current collector and the electrode terminal. And arranging the process,
A step of caulking an end portion of the connecting portion penetrating the through hole ,
On the inner peripheral surface of the hole of the cylindrical body, a tapered surface is formed, the inner diameter of which becomes larger as it approaches the opening of the end portion inserted into the through hole,
In the step of caulking the end portion of the connection portion, the end portion which is inserted into the hole of the cylindrical body and penetrates the through hole is caulked.
A method for manufacturing a storage element.

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