JP2018147829A - Power storage element and manufacturing method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage element capable of simplifying a manufacturing processing when fixing an electrode terminal and a collector to a container, and improving reproductivity.SOLUTION: A power storage element 10 comprises: a container 100; an electrode body 400; an electrode terminal 210; and a collector 220. The electrode terminal 210 includes a first projection part 212 that is connected to an external direction of the container 100 with an axis part 211 and is arranged, and is projected from the axis part 211 to a direction along an external surface of the container 100. The collector 220 includes a second projection part 223 that is connected to an internal direction of the container 100 with the axis part 211 and is arranged, and is projected from the axis part 211 along an internal surface of the container 100. The first projection part 212, the axis part 211, and the second projection part 223 are integrally formed, and a hole part 230 is formed in the electrode terminal 210 and the collector 220 over from the first projection part 212 to the second projection part 223. When viewing from an axial direction of the axis part 211, a hole part 232 formed in the axis part 211 is arranged in a hole part 233 formed in the second projection part 223.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a power storage device including a container, an electrode terminal, and a current collector, and a method for manufacturing the same.

  2. Description of the Related Art Conventionally, a power storage element that includes a container, an electrode terminal, and a current collector and in which the electrode terminal and the current collector are fixed to the container is widely known. For example, in Patent Document 1, the shaft-shaped portion of the external electrode (electrode terminal) is inserted into the through-hole of the lid of the exterior body (container) and the through-hole of the current collector, and the diameter is increased at the lower end of the shaft-shaped portion A power storage element is disclosed in which the outer electrode and the current collector are crimped and fixed to the lid by forming the portion.

JP, 2006-122604, A

  However, in the above conventional power storage element, the electrode terminal and the current collector are separate members and the number of parts is increased, so that the manufacturing process for fixing the electrode terminal and the current collector to the container becomes complicated. . For this reason, it is desired to improve productivity by simplifying the manufacturing process when fixing the electrode terminal and the current collector to the container.

  The present invention has been made in view of the above problems, and provides a storage element that can simplify a manufacturing process when fixing an electrode terminal and a current collector to a container and improve productivity, and a manufacturing method thereof. The purpose is to provide.

  In order to achieve the above object, a power storage device according to one embodiment of the present invention includes a container, an electrode body disposed inside the container, an electrode terminal having a shaft portion penetrating the container, and the electrode A terminal and a current collector connected to the electrode body, wherein the electrode terminal is arranged to be connected to the shaft portion outside the container, and extends from the shaft portion in a direction along the outer surface of the container. The current collector is connected to the shaft portion inwardly of the container, and protrudes from the shaft portion in a direction along the inner surface of the container. The first protrusion, the shaft, and the second protrusion are integrated, and the electrode terminal and the current collector are connected to the second protrusion from the first protrusion. A hole is formed across the protrusion, and is formed in the shaft as viewed from the axial direction of the shaft. Hole is disposed in the second protruding portion which is formed in the hole portion.

  According to this, in the electric storage element, the first protruding portion and the shaft portion of the electrode terminal and the second protruding portion of the current collector are integrated. For this reason, the electrode terminal and the current collector are integrated, and the number of parts is reduced. Further, the electrode terminal and the current collector are formed with a hole extending from the first protruding portion to the second protruding portion, and the hole formed in the shaft portion is the first when viewed from the axial direction of the shaft portion. It arrange | positions in the hole formed in the 2 protrusion part. For this reason, for example, the second projecting portion could be easily formed by using a technique of pulling out the blind rivet arranged in the hole extending from the electrode terminal to the current collector to form the second projecting portion. It is a configuration. From these things, according to the said electrical storage element, since the thing with which the electrode terminal and the electrical power collector were integrated can be easily fixed to a container, an electrode terminal and an electrical power collector are fixed to a container. This simplifies the manufacturing process and improves productivity.

  Further, the second projecting portion may be formed so as to project from the shaft portion over the entire circumference of the shaft portion.

  According to this, the current collector and the electrode terminal can be firmly fixed to the container by forming the second protruding portion of the current collector over the entire circumference of the shaft portion. In addition, for example, by pulling out the blind rivet disposed in the hole, the second protrusion can be easily formed over the entire circumference of the shaft, so that the electrode terminal and the current collector are firmly attached to the container. The manufacturing process at the time of fixing to can be simplified and productivity can be improved.

  Further, the hole portion may have the same shape from the shaft portion to the second projecting portion when viewed from the axial direction of the shaft portion.

  According to this, the hole from the electrode terminal to the current collector has the same shape from the shaft to the second protrusion. That is, for example, by pulling out the blind rivet arranged in the hole, and expanding the outer periphery of the shaft by expanding the hole of the shaft into the same shape as the hole of the second protrusion, the shaft is used as a sealing member. It is the structure which can be pressed and can ensure airtightness. For this reason, the manufacturing process at the time of fixing an electrode terminal and an electrical power collector to a container, ensuring airtightness can be simplified, and productivity can be improved.

  In addition, a sealing member disposed between the shaft portion and the container is provided, and the sealing member protrudes toward the first protruding portion and includes a protruding portion that contacts the first protruding portion. You may decide to have it.

  According to this, since the convex part which contact | abuts with a 1st protrusion part is formed in the sealing member between the axial part of an electrode terminal, and a container, the said convex part is press-contacted to a 1st protrusion part. Thus, the airtightness of the sealing member can be improved. For example, when pulling out the blind rivet arranged in the hole, the convex portion is crushed by the pulling load of the blind rivet, and the airtightness can be improved. For this reason, the manufacturing process at the time of fixing an electrode terminal and an electrical power collector to a container, ensuring airtightness can be simplified, and productivity can be improved.

  In order to achieve the above object, a method for manufacturing a power storage element according to one embodiment of the present invention includes a container, an electrode body disposed inside the container, and an electrode having a shaft portion that penetrates the container. A storage element comprising: a terminal; and a current collector connected to the electrode terminal and the electrode body, wherein the electrode terminal is disposed outside the container and connected to the shaft portion; And a first projecting portion projecting from the shaft portion in a direction along the outer surface of the container, and a current collector integrated with the first projecting portion and the shaft portion on the inside of the container. A projecting portion forming step of forming a second projecting portion that is connected to the shaft portion and that projects from the shaft portion in a direction along the inner surface of the container; Blind rivets placed in holes formed between the current collector and the current collector By pulling out the to form the second projecting portion to the current collector.

  According to this, in the method for manufacturing a storage element, in the configuration in which the first protruding portion and the shaft portion of the electrode terminal and the current collector are integrated, the hole formed from the first protruding portion to the current collector. A second protrusion is formed on the current collector by pulling out the blind rivet disposed in the portion. That is, since the electrode terminal and the current collector are integrated, the number of parts is reduced. Further, the second protrusion can be easily formed on the current collector by pulling out the blind rivet disposed in the hole extending from the first protrusion to the current collector. For these reasons, according to the method for manufacturing the power storage element, the electrode terminal and the current collector integrated with each other can be easily fixed to the container. The manufacturing process at the time of fixing can be simplified and productivity can be improved.

  Further, in the protruding portion forming step, by pulling out the blind rivet, the hole portion is expanded in the same shape from the second protruding portion to the shaft portion when viewed from the axial direction of the shaft portion. May be.

  According to this, the blind rivet arranged in the hole is pulled out, and the hole is expanded in the same shape from the second protrusion to the shaft, thereby widening the outer periphery of the shaft and sealing the shaft Airtightness can be ensured by pressing against the member. For this reason, the manufacturing process at the time of fixing an electrode terminal and an electrical power collector to a container, ensuring airtightness can be simplified, and productivity can be improved.

  The present invention can be realized not only as such a power storage element and a manufacturing method thereof, but also as an integrated electrode terminal and current collector provided in the power storage element, and a manufacturing method thereof. it can.

  ADVANTAGE OF THE INVENTION According to this invention, the electrical storage element which can simplify the manufacturing process at the time of fixing an electrode terminal and an electrical power collector to a container, and can improve productivity 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 sectional drawing which shows the structure of the positive electrode current collection member which concerns on embodiment, and its periphery. It is a perspective view which shows the process in which the structure of the positive electrode current collection member which concerns on embodiment, and its periphery is formed. It is sectional drawing which shows the process in which the structure of the positive electrode current collection member which concerns on embodiment, and its periphery is formed. It is sectional drawing which shows the structure of the negative electrode current collection member which concerns on embodiment, and its periphery. It is sectional drawing which shows the process of forming the positive electrode current collection member which concerns on the modification of embodiment, and the structure of the periphery.

  Hereinafter, a power storage device according to an embodiment of the present invention and a modification thereof will be described with reference to the drawings. It should be noted that each of the embodiments and modifications thereof described below is a comprehensive or specific example. The numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of the constituent elements, manufacturing steps, order of manufacturing steps, and the like shown in the following embodiments and modifications thereof are merely examples and are intended to limit the present invention. is not. In addition, among the constituent elements in the following embodiments and modifications thereof, constituent elements that are not described in the independent claims indicating the highest concept are described as arbitrary constituent elements. Each figure is a schematic diagram, and dimensions and the like are not necessarily shown strictly.

  In the following description and drawings, the direction in which the pair of electrode terminals and current collectors of the power storage element are aligned, the direction in which the pair of tab bundles in the electrode body is aligned, or the direction in which the short side of the container faces is the X-axis direction. It is defined as The opposing direction of the long side of the container, the short direction of the short side of the container, the thickness direction of the container, or the stacking direction of the electrode plates of the electrode body is defined as the Y-axis direction. Further, the direction in which the container body and the lid of the electricity storage element are arranged, the longitudinal direction of the short side surface of the container, the axial direction of the shaft portion of the electrode terminal, or the vertical direction is defined as the Z-axis direction. These X-axis direction, Y-axis direction, and Z-axis direction are directions that intersect (orthogonal in this embodiment). Although the case where the Z-axis direction does not become the vertical direction may be considered depending on the usage mode, the Z-axis direction will be described below as the vertical direction for convenience of explanation. In the following description, for example, the X axis direction plus side indicates the arrow direction side of the X axis, and the X axis direction minus side indicates the opposite side to the X axis direction plus side. The same applies to the Y-axis direction and the Z-axis direction.

(Embodiment)
First, a general description of the power storage element 10 in the present embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a perspective view showing an external appearance of a power storage element 10 according to the present embodiment. FIG. 2 is an exploded perspective view of the electricity storage device 10 according to the present exemplary embodiment.

  The storage element 10 is a secondary battery that can charge electricity and discharge electricity, and specifically, is a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. The power storage element 10 includes, for example, a power source for an automobile (or a moving body) such as an electric vehicle (EV), a hybrid electric vehicle (HEV), or a plug-in hybrid electric vehicle (PHEV), a power source for electronic devices, and a power storage power source. Applicable to etc. The storage element 10 is not limited to a non-aqueous electrolyte secondary battery, and may be a secondary battery other than a non-aqueous electrolyte secondary battery, a capacitor, or a battery that is charged by a user. The battery may be a primary battery that can use the stored electricity without having to perform the operation.

  As shown in these drawings, the electricity storage device 10 includes a container 100, a positive electrode current collector 200, a negative electrode current collector 300, an electrode body 400, a positive electrode sealing member 500, and a negative electrode sealing member 600. I have. In addition, an electrolytic solution (non-aqueous electrolyte) is sealed inside the container 100 of the power storage element 10, but the illustration is omitted. In addition, as long as the electrolyte solution enclosed with the container 100 does not impair the performance of the electrical storage element 10, there is no restriction | limiting in particular in the kind, Various things can be selected.

  The container 100 includes a container body 110 having a rectangular cylindrical shape and a bottom, and a lid body 120 that is a plate-like member that closes the opening of the container body 110. In addition, the container 100 can be hermetically sealed by welding the lid body 120 and the container body 110 after accommodating the electrode body 400 and the like therein. The container 100 (the lid 120 and the container main body 110) is formed of a weldable metal such as stainless steel, aluminum, or an aluminum alloy. The lid 120 and the container body 110 are preferably formed of the same material, but may be formed of different materials. Further, the lid 120 is provided with a liquid injection part for injecting an electrolyte into the container 100, a gas discharge valve for discharging the gas inside the container 100 when the internal pressure of the container 100 rises, and the like. Also good.

  The positive electrode current collecting member 200 and the negative electrode current collecting member 300 are members that are electrically connected to the positive electrode plate and the negative electrode plate of the electrode body 400, and have both functions of a current collector and an electrode terminal. That is, the positive electrode current collecting member 200 and the negative electrode current collecting member 300 lead out the electricity stored in the electrode body 400 to the external space of the electricity storage element 10, and in order to store electricity in the electrode body 400, It is a metal member for introducing electricity into the internal space. For example, the positive electrode current collector 200 is made of aluminum or an aluminum alloy, and the negative electrode current collector 300 is made of copper or a copper alloy. Further, the positive electrode current collecting member 200 and the negative electrode current collecting member 300 are attached and fixed to the lid body 120 of the container 100. A detailed description of the configuration of the positive electrode current collecting member 200 and the negative electrode current collecting member 300 will be described later.

  The electrode body 400 includes a positive electrode plate, a negative electrode plate, and a separator, and is a power storage element (power generation element) that can store electricity, and is disposed inside the container 100. Specifically, the electrode body 400 is formed by winding what is arranged in layers so that a separator is sandwiched between a positive electrode plate and a negative electrode plate. Accordingly, the electrode body 400 includes a tab bundle 410 formed by stacking the protruding portions of the positive electrode plate, and a tab bundle 420 formed by stacking the protruding portions of the negative electrode plate. In the present embodiment, an elliptical shape is illustrated as a cross-sectional shape of the electrode body 400, but an elliptical shape, a circular shape, a polygonal shape, or the like may be used.

  More specifically, the positive electrode plate has a flat and rectangular positive electrode current collector foil made of aluminum or an aluminum alloy, and a positive electrode active material layer formed on the surface of the positive electrode current collector foil. The negative electrode plate has a flat and rectangular negative electrode current collector foil made of copper or a copper alloy, and a negative electrode active material layer formed on the surface of the negative electrode current collector foil. Moreover, both the positive electrode current collector foil and the negative electrode current collector foil have rectangular tabs that protrude upward (Z-axis direction plus side). And a some tab is laminated | stacked by the positive electrode plate and the negative electrode plate by laminating | stacking a some positive electrode plate and a some negative electrode plate. As a result, a positive electrode side tab bundle 410 and a negative electrode side tab bundle 420 are formed on the electrode body 400. The tab bundle 410 on the positive electrode side and the tab bundle 420 on the negative electrode side are joined to the positive electrode current collector member 200 and the negative electrode current collector member 300 by welding or the like, and are electrically connected to the positive electrode current collector member 200 and the negative electrode current collector member 300. Connected.

  The positive electrode sealing member 500 and the negative electrode sealing member 600 are insulating sealing members (gaskets) disposed between the lid 120 of the container 100 and the positive electrode current collecting member 200 and the negative electrode current collecting member 300. The positive electrode sealing member 500 and the negative electrode sealing member 600 are made of, for example, a resin such as polycarbonate (PC), polypropylene (PP), polyethylene (PE), or polyphenylene sulfide resin (PPS). A detailed description of the configuration of the positive electrode sealing member 500 and the negative electrode sealing member 600 will be described later.

  Next, the configuration of the positive electrode current collecting member 200, the negative electrode current collecting member 300, and their periphery will be described in detail. In addition, since the positive electrode current collecting member 200 and the surrounding configuration and the negative electrode current collecting member 300 and the surrounding configuration have the same configuration, the positive electrode current collecting member 200 and the surrounding configuration will be exemplified below. A description will be given, and the configuration of the negative electrode current collecting member 300 and its periphery will be described later.

  FIG. 3 is a cross-sectional view showing the configuration of the positive electrode current collector 200 and its surroundings according to the present embodiment. Specifically, FIG. 2 is a cross-sectional view showing the configuration when the positive electrode current collector 200 shown in FIG. 2 and its periphery are cut along a plane parallel to the XZ plane including the III-III line.

  As shown in the drawing, the positive electrode current collector 200 is integrally provided with an electrode terminal 210 and a current collector 220. That is, the electrode terminal 210 and the current collector 220 are an integrally molded product made of the same member formed by processing one continuous member. In other words, the positive electrode current collector 200 is a continuous single member, and the electrode terminal 210 and the current collector 220 are part of the single member.

  The positive electrode sealing member 500 includes a positive electrode upper sealing member 510 and a positive electrode lower sealing member 520. Note that the positive electrode upper side sealing member 510 and the positive electrode lower side sealing member 520 may be formed of the same material or different materials.

  Specifically, the electrode terminal 210 is a portion where the upper portion is disposed outward from the lid body 120 and is connected (joined) to a bus bar or the like, and has a shaft portion 211 and a first protruding portion 212. . The current collector 220 is a portion that is disposed inward from the lid 120 and is connected to the electrode terminal 210 and the electrode body 400, and includes an electrode body connecting portion 221, an intermediate portion 222, and a second protruding portion 223. ing. The positive electrode upper sealing member 510 is a positive gasket-side upper gasket, and has an upper sealing member bottom 511 and an upper sealing member wall 512. The positive electrode lower sealing member 520 is a lower gasket on the positive electrode side, and includes a lower sealing member cylinder portion 521 and a lower sealing member bottom portion 522. Hereinafter, each of these parts will be described in detail.

  First, the electrode terminal 210 will be described. The shaft portion 211 is a cylindrical portion that extends from the central portion of the first protruding portion 212 toward the negative side in the Z-axis direction and penetrates the container 100. Specifically, the lower sealing member cylinder 521 is inserted into the through hole 120a of the lid 120, and the shaft 211 is inserted into the through hole 521a of the lower sealing member cylinder 521. Has been placed. That is, the shaft portion 211 is disposed in a state where the outer peripheral surface is in contact (pressure contact) with the inner peripheral surface of the lower sealing member cylinder portion 521. In the present embodiment, the shaft portion 211 is a cylindrical portion, and the through hole 521a is a through hole having a circular shape in a top view corresponding to the outer peripheral shape of the shaft portion 211.

  The first projecting portion 212 is a projecting portion that is connected to the shaft portion 211 outside the container 100 and projects from the shaft portion 211 in the direction along the outer surface of the container 100. That is, the first projecting portion 212 is a rectangular and plate-like portion that is disposed above the shaft portion 211 so as to project along the outer surface 120 b of the lid 120. Specifically, the first protrusion 212 is disposed in a state where the lower surface is in contact (pressure contact) with the upper surface of the upper sealing member bottom 511. A bus bar (not shown) is joined to the outer surface 212a of the first protrusion 212 by welding or the like.

  Next, the current collector 220 will be described. The electrode body connecting portion 221 is a rectangular and plate-like portion joined to the electrode body 400, and is disposed so as to extend from the intermediate portion 222 in the axial direction of the shaft portion 211 (Z-axis direction minus side). . That is, the electrode body connection part 221 is disposed immediately below the electrode terminal 210. With this configuration, since the electrode body connecting portion 221 and the electrode body 400 are joined in the vicinity of the electrode terminal 210, the distance between the electrode body 400 and the electrode terminal 210 can be shortened to reduce resistance.

  Specifically, the electrode body connecting portion 221 is joined to the tab bundle 410 of the electrode body 400 by welding such as laser welding, ultrasonic welding, resistance welding, or mechanical joining by caulking. From the viewpoint of space saving, the electrode body connecting portion 221 may be bent in the Y-axis direction together with the tab bundle 410 after being joined to the tab bundle 410. In this case, the electrode body connecting portion 221 may be thinly formed to a foldable thickness.

  The intermediate part 222 is a cylindrical part disposed between the electrode body connecting part 221 and the second projecting part 223. The intermediate part 222 is a cylindrical part whose outer peripheral shape has the same shape as the shaft part 211. Note that the lower end portion of the intermediate portion 222, that is, the end portion on the side connected to the electrode body connecting portion 221 is closed without opening.

  The second projecting portion 223 is a projecting portion that is disposed inward of the container 100 and connected to the shaft portion 211 and projects from the shaft portion 211 in a direction along the inner surface of the container 100. Specifically, the second projecting portion 223 is formed so as to project from the shaft portion 211 over the entire circumference of the shaft portion 211. That is, the second projecting portion 223 is an annular portion that is disposed below the shaft portion 211 so as to project along the inner surface 120 c of the lid 120. In the present embodiment, the second projecting portion 223 is an annular portion formed along the outer periphery of the shaft portion 211. That is, the second protrusion 223 is arranged in a state where the upper surface is in contact (pressure contact) with the lower surface of the lower sealing member bottom 522. In addition, the 2nd protrusion part 223 is formed in the magnitude | size which covers the through-hole 120a of the cover body 120 (it reaches the outer side of the through-hole 120a) by upper surface view.

  Here, as described above, the electrode terminal 210 and the current collector 220 constituting the positive electrode current collector 200 are integrated. That is, the 1st protrusion part 212, the axial part 211, and the 2nd protrusion part 223 are integrated. And the hole part 230 is formed in the electrode terminal 210 and the electrical power collector 220 from the 1st protrusion part 212 to the 2nd protrusion part 223 (specifically, from the 1st protrusion part 212 to the intermediate part 222). Has been. Specifically, the hole 231 is formed in the first protrusion 212, the hole 232 is formed in the shaft 211, the hole 233 is formed in the second protrusion 223, and the intermediate part 222 is formed in the intermediate part 222. A hole 234 is formed. In the present embodiment, the holes 231 to 234 are holes that are circular when viewed from above. In addition, the electrode body connection part 221 is a solid site | part in which the hole part is not formed.

  Further, when viewed from the axial direction (Z-axis direction) of the shaft portion 211, the hole portion 232 formed in the shaft portion 211 is disposed in the hole portion 233 formed in the second projecting portion 223. Specifically, the holes 231 and 232 are disposed in the holes 233 and 234 when viewed from the axial direction of the shaft 211. In the present embodiment, the hole portion 230 has the same shape from the shaft portion 211 to the second protruding portion 223 when viewed from the axial direction of the shaft portion 211. That is, the holes 231 to 234 have the same shape when viewed from the axial direction of the shaft 211. The “same shape” is not limited to being completely coincident, and some error is allowed.

  Next, the positive electrode upper side sealing member 510 will be described. The upper sealing member bottom 511 is a rectangular and flat part disposed between the first protrusion 212 and the lid 120. That is, the upper sealing member bottom 511 is disposed in contact with (pressed against) the first protrusion 212 and the lid 120, and the insulating property between the first protrusion 212 and the lid 120. And airtightness is ensured. In addition, a through hole 511a is formed in the upper sealing member bottom 511, and the shaft portion 211 and the lower sealing member cylinder 521 are inserted into the through hole 511a.

  The upper sealing member wall portion 512 is an annular wall portion erected from the outer edge of the upper sealing member bottom portion 511 and is arranged so as to surround the first protrusion 212. That is, the upper sealing member wall portion 512 ensures insulation between the first protruding portion 212 and the lid 120 or an external member.

  Next, the positive electrode lower side sealing member 520 will be described. The lower sealing member cylinder portion 521 extends from the central portion of the lower sealing member bottom portion 522 to the plus side in the Z-axis direction, and is a cylindrical portion disposed between the shaft portion 211 and the container 100. It is. Specifically, the lower sealing member cylinder 521 is inserted and disposed in the through hole 120 a of the lid 120 and the through hole 511 a of the upper sealing member bottom 511. That is, the lower sealing member cylinder portion 521 is disposed in a state of being in contact (pressure contact) with the shaft portion 211 and the lid body 120, so that insulation and airtightness between the shaft portion 211 and the lid body 120 are provided. The sex is secured. In the present embodiment, the lower sealing member cylinder portion 521 is a cylindrical portion, and the through holes 120a and 511a are circular through holes in a top view corresponding to the outer peripheral shape of the lower sealing member cylinder portion 521. It is a hole.

  Further, the lower sealing member cylinder 521 has an annular (annular) convex portion 521b at the tip (see FIG. 4). The convex portion 521 b is a protruding portion that protrudes toward the first protruding portion 212 and contacts the first protruding portion 212. Specifically, the convex portion 521b is disposed between the first protruding portion 212 and the second protruding portion 223. That is, the lower sealing member cylinder 521 is disposed in a state of being pressed against the first protrusion 212 by the second protrusion 223, and the first protrusion 212, the shaft 211, the second protrusion 223, and the lid Airtightness with the body 120 is ensured.

  The lower sealing member bottom 522 is a rectangular and flat portion disposed between the lid 120 and the second protrusion 223. That is, the lower sealing member bottom 522 is disposed in contact with (contacted with) the lid 120 and the second projecting portion 223, and insulation between the lid 120 and the second projecting portion 223 is achieved. Ensuring airtightness and airtightness.

  Next, a process of forming the positive electrode current collecting member 200 and its peripheral configuration will be described in detail. FIG. 4 is a perspective view showing a process of forming the positive electrode current collector 200 and its peripheral configuration according to the present embodiment. Specifically, FIG. 4A is an exploded perspective view showing each member before forming the positive electrode current collecting member 200 and its peripheral configuration shown in FIG. 3, and FIG. ) Is a perspective view showing a state in which those members are assembled. FIG. 5 is a cross-sectional view showing a process of forming the positive electrode current collector 200 and the surrounding structure according to the present embodiment. Specifically, (a) of FIG. 5 is a cross-sectional view of the configuration of (b) of FIG. 4 taken along a plane parallel to the XZ plane including the V (a) -V (a) line. FIG. 5B is a cross-sectional view showing a configuration after the blind rivet 240 is pulled out.

  First, as shown in FIG. 4A, a positive electrode current collector 200a having a blind rivet 240 embedded therein is disposed. That is, in the positive electrode current collector 200a, the blind rivet 240 is embedded in the hole 230a (see FIG. 5A) formed from the first protrusion 212 to the current collector 220a. Yes.

  4 (b) and FIG. 5 (a), the lower sealing member cylinder 521 of the positive electrode lower sealing member 520 includes the through hole 120a of the lid 120 and the upper sealing. It is inserted and arranged in the through hole 511a of the member bottom 511. Further, the shaft portion 211a of the electrode terminal 210a of the positive electrode current collecting member 200a is inserted and disposed in the through hole 521a of the lower sealing member tube portion 521.

  And as shown to (a) and (b) of FIG. 5, the 2nd protrusion part 223 is formed in the electrical power collector 220a integrated with the 1st protrusion part 212 of the electrode terminal 210, and the axial part 211a. Hereinafter, it is referred to as a protruding portion forming step). Specifically, in the protrusion forming step, the current collector 220 is connected to the current collector 220 by pulling out the blind rivet 240 arranged in the hole 230a formed from the first protrusion 212 to the current collector 220a. A protrusion 223 is formed.

  Here, the blind rivet 240 has a flat cylindrical tip portion 241 and a cylindrical main shaft portion 242 having a smaller diameter than the tip portion 241. Further, the hole 230 a has a shape corresponding to the tip 241 and the main shaft 242 of the blind rivet 240. That is, a large-diameter hole corresponding to the tip 241 is formed at a position corresponding to the intermediate portion 222 of the current collector 220a, and the tip 241 is disposed. In addition, a small-diameter hole corresponding to the main shaft portion 242 is formed from the end 223a of the current collector 220a to the first protruding portion 212 of the electrode terminal 210a, and the main shaft portion 242 is disposed.

  With this configuration, when pulling out the blind rivet 240 disposed in the hole 230a in the protrusion forming step, the tip 241 of the blind rivet 240 is raised, and the cylindrical end 223a of the current collector 220a is moved outward. Push it out. Thereby, the end 223a becomes the second protrusion 223, and the current collector 220 is formed. Further, when the tip 241 of the blind rivet 240 is further raised, the inner surface of the shaft portion 211a of the electrode terminal 210a is similarly expanded outward to form the shaft portion 211, whereby the electrode terminal 210 is formed.

  As described above, in the protrusion forming process, the blind rivet 240 is pulled out so that the hole 230 is expanded in the same shape from the second protrusion 223 to the shaft 211 when viewed from the axial direction of the shaft 211. That is, the holes 231 to 234 are expanded to the same shape, and the positive electrode current collector 200 is formed.

  Further, the shape of the convex portion 521b formed in the lower sealing member cylinder portion 521 changes before and after the blind rivet 240 is pulled out. Specifically, as shown in FIG. 5 (a), in the state before the blind rivet 240 is pulled out, the protrusion 521b has a substantially semicircular cross section protruding toward the first protrusion 212. It has a shape arranged in an (annular) shape. On the other hand, as shown in FIG. 5B, in the state after the blind rivet 240 is pulled out, the convex portion 521b is pressed and crushed toward the first projecting portion 212, so that it has a substantially flat shape. become. However, even in this state, the trace of the convex portion 521b can be confirmed by disassembly. For this reason, although the shape of the convex portion 521b changes before and after the blind rivet 240 is pulled out, it can be said that the lower sealing member cylindrical portion 521 has the convex portion 521b in any state. In addition, the shape of the convex part 521b is not limited to a substantially semicircular cross section, and may be any cross sectional shape, and is not an annular shape (annular shape), but protruded portions are discretely arranged. It may be.

  Further, the negative electrode current collecting member 300 is formed in the same manner as the positive electrode current collecting member 200 described above. FIG. 6 is a cross-sectional view showing the configuration of the negative electrode current collecting member 300 and its surroundings according to the present embodiment.

  As shown in the figure, with respect to the negative electrode current collecting member 300, the first protruding portion 312 of the electrode terminal 310 does not protrude as much as the first protruding portion 212 of the positive electrode current collecting member 200. A plate-like member 340 is disposed around the periphery. That is, since the negative electrode current collecting member 300 is bonded to the negative electrode plate of the electrode body 400, it is preferably formed of copper or a copper alloy, but the portion connected to the bus bar is formed of aluminum or an aluminum alloy. It is preferable. For this reason, a plate-like member 340 made of aluminum or an aluminum alloy is disposed around the first protruding portion 312 of the negative electrode current collecting member 300.

  As described above, according to the electric storage device 10 according to the embodiment of the present invention, the first protruding portion 212 and the shaft portion 211 of the electrode terminal 210 and the second protruding portion 223 of the current collector 220 are integrated. Yes. For this reason, the electrode terminal 210 and the collector 220 are integrated, and the number of parts is reduced. Further, the electrode terminal 210 and the current collector 220 are formed with a hole 230 extending from the first protruding portion 212 to the second protruding portion 223, and when viewed from the axial direction of the shaft portion 211, The formed hole 232 is disposed in the hole 233 formed in the second protrusion 223. For this reason, the 2nd protrusion part 223 is easily formed using the method of pulling out the blind rivet 240 arrange | positioned in the hole part 230a ranging from the electrode terminal 210a to the collector 220a, and forming the 2nd protrusion part 223. It was a configuration that could be done. For these reasons, according to the electricity storage element 10, the integrated electrode terminal 210 and current collector 220 can be easily fixed to the container 100. The production process for fixing the electric body 220 can be simplified, and the productivity can be improved.

  Moreover, the current collector 220 and the electrode terminal 210 can be firmly fixed to the container 100 by forming the second protrusion 223 of the current collector 220 over the entire circumference of the shaft portion 211. In addition, by pulling out the blind rivet 240 disposed in the hole 230a, the second protrusion 223 can be easily formed over the entire circumference of the shaft portion 211. The production process when firmly fixing the body 220 can be simplified, and the productivity can be improved.

  The hole 230 extending from the electrode terminal 210 to the current collector 220 has the same shape from the shaft portion 211 to the second protrusion 223. That is, the blind rivet 240 disposed in the hole 230a is pulled out, and the outer periphery of the shaft 211 is expanded by expanding the hole 232 of the shaft 211 into the same shape as the hole 233 of the second protrusion 223. In this configuration, 211 is pressed against the positive electrode lower side sealing member 520 to ensure airtightness. For this reason, the manufacturing process at the time of fixing the electrode terminal 210 and the electrical power collector 220 to the container 100, ensuring airtightness can be simplified, and productivity can be improved.

  Moreover, since the convex part 521b which contact | abuts the 1st protrusion part 212 is formed in the positive electrode lower side sealing member 520 between the axial part 211 of the electrode terminal 210, and the container 100, the convex part 521b is the 1st protrusion. By being in pressure contact with the portion 212, the airtightness by the positive electrode lower side sealing member 520 can be improved. That is, when the blind rivet 240 arranged in the hole 230a is pulled out, the convex portion 521b is crushed by the pulling-out load of the blind rivet 240, and airtightness can be improved. For this reason, the manufacturing process at the time of fixing the electrode terminal 210 and the electrical power collector 220 to the container 100, ensuring airtightness can be simplified, and productivity can be improved.

  In addition, according to the method for manufacturing power storage device 10 according to the embodiment of the present invention, the first protrusion 212 and the shaft part 211a of the electrode terminal 210a and the current collector 220a are integrated in the first protrusion. The second protrusion 223 is formed on the current collector 220 by pulling out the blind rivet 240 disposed in the hole 230a formed from the portion 212 to the current collector 220a. That is, since the electrode terminal 210a and the current collector 220a are integrated, the number of parts is reduced. Moreover, the 2nd protrusion part 223 can be easily formed in the electrical power collector 220 by pulling out the blind rivet 240 arrange | positioned in the hole 230a ranging from the 1st protrusion part 212 to the electrical power collector 220a. From these things, according to the manufacturing method of the electrical storage element 10, what integrated the electrode terminal 210 and the electrical power collector 220 can be easily fixed to the container 100, Therefore The manufacturing process for fixing the current collector 220 can be simplified, and productivity can be improved.

  Further, by pulling out the blind rivet 240 arranged in the hole 230a and widening the hole 230 in the same shape from the second protrusion 223 to the shaft 211, the outer periphery of the shaft 211 is expanded, and the shaft 211 can be pressed against the positive electrode lower side sealing member 520 to ensure airtightness. For this reason, the manufacturing process at the time of fixing the electrode terminal 210 and the electrical power collector 220 to the container 100, ensuring airtightness can be simplified, and productivity can be improved.

(Modification)
Next, a modification of the above embodiment will be described. FIG. 7 is a cross-sectional view showing a process of forming the positive electrode current collector 200b and its peripheral configuration according to a modification of the present embodiment. Specifically, FIG. 7A corresponds to FIG. 5A, and FIG. 7B corresponds to FIG. 5B.

  As shown in FIGS. 7A and 7B, also in the present modification, in the protruding portion forming step, it is disposed in the hole portion 230a formed from the first protruding portion 212 to the current collector 220a. By pulling out the blind rivet 240, the second protrusion 223 is formed on the current collector 220. However, in this modified example, when the blind rivet 240 is pulled out in the protruding portion forming step, the tip 241 of the blind rivet 240 is left in the hole. Thus, “pulling out the blind rivet 240” in the protrusion forming step includes not only pulling out the entire blind rivet 240 but also pulling out a part of the blind rivet 240.

  Specifically, in the projecting portion forming step, when the blind rivet 240 disposed in the hole 230a is pulled out, the tip 241 of the blind rivet 240 is raised and the current collector 220a is The cylindrical end 223a is pushed outward. Thereby, the end 223a becomes the second protrusion 223, and the current collector 220 is formed. Thereafter, the blind rivet 240 is folded at the tip portion, and the tip portion 241 remains in the hole 230b. In addition, after the 2nd protrusion part 223 is formed, you may decide that all or one part of the main shaft part 242 remains in the hole part 230b.

  Thus, in the present modification, the hole formed in the shaft portion 211a is smaller than the hole formed in the second protrusion 223 when viewed from the axial direction (Z-axis direction) of the shaft portion 211a. . Specifically, when viewed from the axial direction of the shaft portion 211a, the hole portions formed in the first protrusion portion 212 and the shaft portion 211a are smaller than the hole portions formed in the second protrusion portion 223 and the intermediate portion 222. Become. Thereby, the positive electrode current collecting member 200b is formed. The same applies to the negative electrode current collecting member.

  In the above embodiment, it is preferable to employ a member harder than the material of the positive electrode current collector 200a as the blind rivet 240. In this modification, the blind rivet 240 is more preferable than the material of the positive electrode current collector 200a. It is preferable to employ a soft member. Further, since the positive electrode current collecting member 200a is often formed of a hard material as the power storage element 10 increases in size, the configuration of the above-described embodiment is preferably employed for a relatively small power storage element 10, and this modification The configuration of the example is preferably employed for a relatively large power storage element 10.

  Moreover, it is preferable that the hole 230 formed in the positive electrode current collecting member 200 in the above embodiment and the hole 230b formed in the positive electrode current collecting member 200b in the present modification are closed with a bus bar. Thereby, especially in this modification, it can suppress that a water | moisture content permeates into the hole 230b, and corrosion generate | occur | produces.

  The power storage device 10 according to the embodiment of the present invention and the modification thereof has been described above, but the present invention is not limited to this embodiment and the modification thereof. In other words, it should be considered that the embodiment and its modification disclosed this time are illustrative and not restrictive in all respects. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  For example, in the above-described embodiment and its modification, the first protrusion of the electrode terminal and the hole formed in the shaft are the second protrusion of the current collector as viewed from the axial direction of the electrode terminal. And it was supposed that it was arrange | positioned in the hole part formed in the intermediate part. However, the hole part formed in the axial part should just be arrange | positioned in the hole part formed in the 2nd protrusion part, and the magnitude | size of another hole part is not limited. That is, for example, the hole formed in the first protrusion may be formed larger than the hole formed in the second protrusion, or the hole formed in the intermediate part may be formed in the shaft part. It may be formed smaller than the formed hole. Also by this, a 2nd protrusion part can be formed using a blind rivet and a positive electrode current collection member can be fixed to a container.

  Moreover, in the said embodiment and its modification, the 2nd protrusion part decided to protrude rather than a shaft part over the perimeter of a shaft part. However, the second protruding portion may have a configuration in which a part of the entire circumference does not protrude from the shaft portion.

  Moreover, in the said embodiment and its modification, the convex part 521b contact | abutted with the 1st protrusion part 212 was formed in the lower side sealing member cylinder part 521 of the positive electrode lower side sealing member 520. As shown in FIG. However, the upper sealing member bottom 511 of the positive electrode upper sealing member 510 may be provided with a convex portion that comes into contact with the first protruding portion 212. Even in this case, it is preferable that the convex portion is disposed between the first protruding portion 212 and the second protruding portion 223. Alternatively, both the positive electrode upper side sealing member 510 and the positive electrode lower side sealing member 520 may be configured not to have the convex portion.

  Moreover, in the said embodiment and its modification, suppose that the electrode body 400 was what was called a horizontal winding type | mold shape which has the winding axis | shaft of a Z-axis direction. However, the electrode body 400 is, for example, a so-called vertical winding shape having a winding axis in the X-axis direction, a stack type shape in which a plurality of flat plate electrodes are stacked, or an electrode plate folded in a bellows shape. It may be a shape or the like. Further, the number of the electrode bodies 400 included in the power storage element 10 is not limited to one, and may be two or more.

  In addition, the form constructed | assembled combining the said embodiment and the said modification arbitrarily is also contained in the scope of the present invention.

  In addition, the present invention can be realized not only as such a power storage element 10 and a method for manufacturing the same, but also an integrated electrode terminal 210 and current collector 220 (positive electrode current collector 200) provided in the power storage element 10, It can also be realized as a manufacturing method thereof.

  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 Container main body 120 Cover body 120a, 511a, 521a Through-hole 120b Outer surface 120c Inner surface 200, 200a, 200b Positive electrode current collection member 210, 210a, 310 Electrode terminal 211, 211a Shaft part 212, 312 First protrusion part 212a Outer surface 220, 220a Current collector 221 Electrode body connection part 222 Intermediate part 223 Second protrusion 223a End part 230, 230a, 230b, 231 to 234 Hole part 240 Blind rivet 241 Tip part 242 Main shaft part 300 Negative electrode current collector 340 Plate member 400 Electrode body 410, 420 Bundle of tabs 500 Positive electrode sealing member 510 Positive electrode upper sealing member 511 Upper sealing member bottom 512 Upper sealing member wall 520 Positive lower sealing member 521 Lower sealing member cylinder Part 521b convex part 522 lower side sealing Zaisoko unit 600 Fukyokufutome member

Claims (6)

A container,
An electrode body disposed inside the container;
An electrode terminal having a shaft portion penetrating the container;
A current collector connected to the electrode terminal and the electrode body;
The electrode terminal has a first projecting portion that is arranged to be connected to the shaft portion outside the container, and projects from the shaft portion in a direction along the outer surface of the container,
The current collector is connected to the shaft portion on the inside of the container, and has a second projecting portion that projects from the shaft portion in a direction along the inner surface of the container,
The first projecting portion, the shaft portion, and the second projecting portion are integrated,
In the electrode terminal and the current collector, a hole is formed from the first protruding portion to the second protruding portion, and is formed in the shaft portion when viewed from the axial direction of the shaft portion. A power storage element, wherein the hole is disposed in a hole formed in the second protrusion. The power storage device according to claim 1, wherein the second projecting portion is formed so as to project from the shaft portion over the entire circumference of the shaft portion. The electric storage element according to claim 1, wherein the hole portion has the same shape as viewed from the axial direction of the shaft portion and extends from the shaft portion to the second projecting portion. Furthermore, a sealing member disposed between the shaft portion and the container is provided,
The power storage device according to any one of claims 1 to 3, wherein the sealing member has a protrusion that protrudes toward the first protrusion and contacts the first protrusion. Production of a storage element comprising: a container; an electrode body disposed inside the container; an electrode terminal having a shaft portion penetrating the container; and a current collector connected to the electrode terminal and the electrode body. A method,
The electrode terminal has a first projecting portion that is arranged to be connected to the shaft portion outside the container, and projects from the shaft portion in a direction along the outer surface of the container,
The current collector integrated with the first projecting portion and the shaft portion is disposed in the container and connected to the shaft portion, and projects from the shaft portion in a direction along the inner surface of the container. Including a protruding portion forming step of forming the second protruding portion,
In the projecting portion forming step, the second projecting portion is formed on the current collector by pulling out a blind rivet disposed in a hole formed across the current collector from the first projecting portion. Device manufacturing method. The said protrusion part formation process WHEREIN: By pulling out the said blind rivet, seeing from the axial direction of the said axial part, the said hole part is extended to the same shape from the said 2nd protruding part to the said axial part. The manufacturing method of the electrical storage element of description.

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