JP2019133827A - Power storage element - Google Patents

Abstract

To provide a power storage element including a container and an electrode terminal disposed in the container, in which a terminal structure can be reduced in size.SOLUTION: A power storage element 10 includes a container 100 and an electrode terminal 300. The container 100 has a first projection 114 and a second projection 115a which project from a cover plate 110 in the same direction. The first projection 114 has a shaft hole 112 through which a shaft body 310 connected to a terminal body 301 penetrates. The second projection 115a is disposed at a position where at least a part of the second projection overlaps with the terminal body 301 as viewed from a shaft direction of the shaft body 310, on a side of the first projection 114. At least one of the first projection 114 and the second projection 115a has a tapered surface 116 formed at a portion adjacent to the other, the tapered surface being tilted in a direction away from the other.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a power storage device including a container and an electrode terminal disposed in the container.

  2. Description of the Related Art Conventionally, an energy storage device including a container that accommodates an electrode body and an electrode terminal disposed in the container is widely known. For example, in Patent Document 1, in a battery manufacturing process, an electrode terminal is inserted into a through-hole of a lid portion via an insulating member, and a burring portion in the through-hole is pressed from the outside of the case. Connecting the lid and the lid. Moreover, in patent document 1, when pressing the burring part, it describes that the distortion | strain and deformation | transformation of a cover part are prevented by deform | transforming so that the groove | channel formed in the outer peripheral part of a burring part may be filled. .

JP 2011-060672 A

  As in the case of the battery in the prior art described above, there may be a case where a concavo-convex structure is formed in the vicinity of the electrode terminal in the container provided in the electric storage element for the purpose of suppressing deformation of the container. However, in the vicinity of the electrode terminal in the container, it is necessary to arrange other members such as a gasket for maintaining the airtightness between the electrode terminal and the container. For this reason, there is a problem in how the other members such as a gasket and the concavo-convex structure formed on the container are folded together (coexist) around the electrode terminal. Therefore, for example, an opening corresponding to the convex portion in the concavo-convex structure of the container is formed in the gasket. As a result, the gasket can be arranged in the container without being disturbed by the convex portion, and the convex portion can be engaged with the opening, thereby causing the convex portion to play a role such as positioning of the gasket. it can.

  As described above, when engaging the concavo-convex structure formed on the container with another member such as a gasket, for example, to reduce the size of the terminal body of the electrode terminal or the size of the storage element itself, It has been found that other members such as these need to be miniaturized. In this case, for example, the distance between two adjacent convex portions in the concavo-convex structure of the container is shortened. As a result, in the mold for forming the concavo-convex structure, the width of the protruding portion for forming the concave portion between the two convex portions is thinned, thereby causing a problem that the durability of the mold is lowered. Arise. That is, there is a manufacturing difficulty in realizing the miniaturization of the terminal structure of the electric storage element having the concavo-convex structure near the electrode terminal on the wall portion of the container.

  The present invention has been made by the inventor of the present application newly paying attention to the above-mentioned problem, and is an electricity storage element including a container and an electrode terminal disposed in the container, and is an electricity storage device capable of miniaturizing the terminal structure. An object is to provide an element.

  To achieve the above object, a power storage device according to one embodiment of the present invention is a power storage device including a container and an electrode terminal disposed in the container, and the container includes the electrode terminal of the container. A first convex portion and a second convex portion that protrude in the same direction from a wall portion on which the terminal body is disposed, and the first convex portion has an axial hole through which a shaft body connected to the terminal main body passes. And the second convex portion is disposed on a side of the first convex portion and at a position at least partially overlapping with the terminal body when viewed from the axial direction of the shaft body. At least one of the first convex portion and the second convex portion is formed with a tapered surface that is inclined in a direction away from the other portion as the distance from the wall portion increases.

  According to this configuration, at a portion where the first convex portion and the second convex portion are adjacent to each other, at least one of the first convex portion and the second convex portion has a tapered surface. Thereby, for example, in order to meet the demand for miniaturization of the terminal body or miniaturization of the electricity storage element itself, even when the first convex portion and the second convex portion are brought close to each other, plastic working using a mold is performed. The first convex portion and the second convex portion can be substantially formed. More specifically, the protruding portion, which is a portion corresponding to the space between the first convex portion and the second convex portion, in the mold can be formed in a shape whose root is thicker than the tip portion. Therefore, the mold can be provided with such durability that it can be used in the actual production of a container having the first convex portion and the second convex portion arranged at positions close to each other.

  Thus, the electrical storage element which concerns on this aspect is an electrical storage element provided with the container and the electrode terminal arrange | positioned at a container, Comprising: It is an electrical storage element in which size reduction of a terminal structure is possible.

  Moreover, the electrical storage element which concerns on 1 aspect of this invention WHEREIN: The said taper surface is good also as being formed in said 1st convex part.

  According to this configuration, since the second convex portion does not need to have a tapered surface, for example, the second convex portion can be formed in a shape having a side surface that rises perpendicular to the wall portion around the entire circumference. . That is, the second convex portion can be formed into a shape that is easily caught by another member such as an insulating member. Accordingly, the second convex portion can be effectively used as a part for positioning other members.

  Moreover, the electrical storage element which concerns on 1 aspect of this invention WHEREIN: The said taper surface is good also as being formed in the perimeter of a said 1st convex part, when it sees from the protrusion direction of a said 1st convex part.

  According to this configuration, since the tapered surface is formed on the entire circumference of the first convex portion, for example, the shape of the mold for forming the first convex portion is simplified. Therefore, the first convex portion can be formed accurately or easily.

  Further, in the energy storage device according to one aspect of the present invention, the shaft body includes a caulking portion disposed inside or outside the container, and the first convex portion and the second convex portion are It is good also as protruding from the wall part toward the side where the said caulking part is arrange | positioned.

  Here, when the shaft body is caulked, the wall portion is less likely to be deformed when caulking from the protruding direction of the first convex portion. That is, in the electricity storage device according to this aspect, when the protruding direction of the first convex portion is the inside of the container, for example, the wall when the shaft body integrally provided on the electrode terminal is caulked and joined to the current collector or the like The deformation of the part is more reliably suppressed. Further, in the electricity storage device according to this aspect, when the protruding direction of the first convex portion is outward of the container, for example, the wall portion when the shaft body provided in the current collector and the terminal body are joined by caulking Deformation is more reliably suppressed.

  Moreover, the electrical storage element which concerns on 1 aspect of this invention WHEREIN: The recessed part may be formed in the back side position of the said 2nd convex part in the said wall part.

  As described above, the second convex portion and the concave portion formed at corresponding positions in the thickness direction of the wall portion are, for example, plastic processing (half punching processing, embossing processing, burring processing, bead processing, drawing processing, etc.) on the wall portion. Can be formed simultaneously. In addition, for example, when the second convex portion protrudes inward of the container, the concave portion on the back side of the second convex portion is used for detent of the insulating member disposed between the terminal body and the wall portion. Can do. Moreover, when the 2nd convex part protrudes to the outward of a container, the recessed part of the back side of a 2nd convex part can be utilized for positioning etc. of the insulating member arrange | positioned at the inner surface of a wall part.

  ADVANTAGE OF THE INVENTION According to this invention, it is an electrical storage element provided with a container and the electrode terminal arrange | positioned at a container, Comprising: The electrical storage element which can be reduced in size 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 shows the component arrange | positioned in the container of the electrical storage element which concerns on embodiment. It is a disassembled perspective view which shows the electrode terminal which concerns on embodiment, and its surrounding component. It is a fragmentary sectional view of the lid plate concerning an embodiment. It is a partially cutaway perspective sectional view showing a shaft hole of a cover plate according to an embodiment and a peripheral portion thereof. It is a perspective view which shows the structure of the upper insulation member which concerns on embodiment. It is a fragmentary sectional view of the electrical storage element concerning an embodiment. It is a figure which shows the arrangement position of the 2nd convex part which concerns on embodiment. It is a fragmentary sectional view of the electrical storage element concerning the modification of an embodiment.

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

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

  In the following description and drawings in the embodiments and modifications, the alignment direction of the pair of electrode terminals included in the power storage element, the alignment direction of the pair of current collectors, both end portions of the electrode body (the pair of composite material layers) The alignment direction of the forming portion), the winding axis direction of the electrode body, or the opposing direction of the short side surface of the container is defined as the X axis direction. Moreover, the opposing direction of the long side surface of the container, the short side direction of the short side surface of the container, or the thickness direction of the container is defined as the Y-axis direction. In addition, the direction in which the container body and the cover plate of the electricity storage element are arranged, the longitudinal direction of the short side surface of the container, the extending direction of the legs of the current collector, 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)
[1. General description of storage element]
First, with reference to FIG. 1 and FIG. 2, a general description of the energy storage device 10 according to the embodiment will be given. FIG. 1 is a perspective view showing an external appearance of a power storage element 10 according to the embodiment. FIG. 2 is a perspective view showing components disposed in the container 100 of the electricity storage device 10 according to the embodiment. Specifically, FIG. 2 is a perspective view showing the power storage element 10 with the lid plate 110 of the container 100 and the container main body 101 separated.

  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. For example, the power storage element 10 includes a power source for an automobile (or a mobile 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 equipment, or a power storage power source. Applicable to etc. In addition, the electric storage element 10 may be mounted as a starting battery for an engine in a vehicle such as a gasoline vehicle or a diesel vehicle. In addition, the electrical storage element 10 is not limited to a nonaqueous electrolyte secondary battery, A secondary battery other than a nonaqueous electrolyte secondary battery may be sufficient, and a capacitor may be sufficient as it. Moreover, the electrical storage element 10 may be a primary battery that can use the stored electricity without being charged by the user. The power storage element 10 may be a battery using a solid electrolyte.

  As shown in FIG. 1, the power storage device 10 includes a container 100, a negative electrode terminal 200, and a positive electrode terminal 300. As shown in FIG. 2, a negative electrode side current collector 120, a positive electrode side current collector 130, and an electrode body 400 are accommodated in the container 100.

  The power storage element 10 may include a spacer disposed on the side of the current collectors 120 and 130, an insulating film that wraps the electrode body 400, and the like in addition to the above-described components. In addition, an electrolytic solution (nonaqueous electrolyte) or the like is sealed in the container 100 of the power storage element 10, but the illustration thereof is omitted. The electrolytic solution sealed in the container 100 is not particularly limited as long as it does not impair the performance of the electricity storage element 10, and various types can be selected.

  The container 100 includes a container body 101 having a rectangular cylindrical shape and a bottom, and a lid plate 110 that is a plate-like member that closes the opening of the container body 101. The container 100 has a structure that seals the inside by welding the lid plate 110 and the container body 101 after the electrode body 400 and the like are accommodated therein. The material of the lid plate 110 and the container body 101 is not particularly limited, but is preferably a weldable metal such as stainless steel, aluminum, or aluminum alloy.

  The electrode body 400 is a power storage element (power generation element) that includes a positive electrode plate, a negative electrode plate, and a separator and can store electricity. The positive electrode plate is an electrode plate in which a composite material layer containing a positive electrode active material is formed on a positive electrode base material layer that is a long strip-shaped current collector foil made of aluminum or an aluminum alloy. The negative electrode plate is an electrode plate in which a composite material layer including a negative electrode active material is formed on a negative electrode base material layer which is a long strip-shaped current collector foil made of copper or a copper alloy. The separator is a microporous sheet made of resin or the like. The electrode body 400 is formed by winding a separator between a positive electrode plate and a negative electrode plate.

  The electrode body 400 is a positive electrode formed by laminating a base material layer of a positive electrode plate at one end in the winding axis direction (X-axis direction in the present embodiment) (the end on the plus side in the X-axis direction in FIG. 2). It has a side end 411a. In addition, the electrode body 400 has a negative electrode side end portion 421a formed by laminating a base material layer of a negative electrode plate on the other end in the winding axis direction (end portion on the negative side in the X axis direction in FIG. 2). The positive electrode side end 411 a is bonded to the current collector 130, and the negative electrode side end 421 a is bonded to the current collector 120.

  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. The shape of the electrode body 400 is not limited to a wound type, and may be a laminated type in which flat plate plates are laminated.

  The electrode terminal 200, which is a negative electrode terminal, is electrically connected to the negative electrode of the electrode body 400 through the current collector 120. The electrode terminal 300 which is a positive electrode terminal is electrically connected to the positive electrode of the electrode body 400 through the current collector 130. The electrode terminals 200 and 300 are attached to the cover plate 110 disposed above the electrode body 400 via upper insulating members 250 and 350.

  The current collectors 120 and 130 are disposed between the electrode body 400 and the wall surface of the container 100, and are electrically connected to the electrode terminals 200 and 300 and the negative electrode plate and the positive electrode plate of the electrode body 400. It is a member provided with rigidity. The material of the current collector 130 is not limited. For example, the current collector 130 is formed of aluminum or an aluminum alloy as in the case of the positive electrode base material layer of the electrode body 400. The material of the current collector 120 is not limited, but is formed of, for example, copper or a copper alloy similarly to the negative electrode base material layer of the electrode body 400.

[2. Structure around electrode terminals]
Next, the structure around the electrode terminal in the energy storage device 10 according to the present embodiment will be described with reference to FIGS. In the present embodiment, the peripheral structures of the electrode terminals 200 and 300 are common. Therefore, in the following, the structure around the positive electrode terminal 300 will be described, and illustration and description of the structure around the negative electrode terminal 200 will be omitted.

  FIG. 3 is an exploded perspective view showing the electrode terminal 300 and its peripheral components according to the embodiment. In addition, in FIG. 3, the state before the shaft body 310 is crimped is illustrated. FIG. 4 is a partial cross-sectional view of lid plate 110 according to the embodiment. In FIG. 4, a cross section taken along the line IV-IV in FIG. 3 is illustrated.

  FIG. 5 is a partially cutaway perspective sectional view showing the shaft hole 112 of the lid plate 110 and the peripheral portion thereof according to the embodiment. FIG. 6 is a perspective view showing the configuration of the back surface side (the cover plate 110 side) of the upper insulating member 350 according to the embodiment. FIG. 7 is a partial cross-sectional view of power storage device 10 according to the embodiment. 7 illustrates a cross section of the electrode terminal 300 and its periphery when the power storage element 10 is cut along the XZ plane passing through the IV-IV line illustrated in FIG. 3.

  As shown in FIG. 3, in the present embodiment, the electrode terminal 300 includes a terminal main body 301 and a shaft body 310 connected to the terminal main body 301. The shaft body 310 extends from the terminal body 301 in a predetermined direction (in the present embodiment, the direction on the minus side of the Z-axis direction). The terminal body 301 is disposed on the cover plate 110 of the container 100 via the upper insulating member 350 and is electrically connected to the current collector 130 in the container 100 via the shaft body 310.

  More specifically, as shown in FIGS. 3 and 7, the shaft body 310 provided in the electrode terminal 300 includes the opening 352 of the upper insulating member 350, the shaft hole 112 of the cover plate 110, and the lower insulating member 380. The tip portion is caulked by being inserted into the opening 382 and the opening 133 of the current collector 130. As a result, a caulking portion 311, which is a caulking end portion, is formed at the tip end portion of the shaft body 310, and the electrode terminal 300 is attached to the cover plate 110 together with the upper insulating member 350, the lower insulating member 380, and the current collector 130. Fixed.

  In the present embodiment, shaft body 310 is provided integrally with terminal body 301. That is, in the present embodiment, the electrode terminal 300 includes a terminal main body 301 and a shaft body 310 provided integrally with the terminal main body 301. The electrode terminal 300 is manufactured, for example, by cutting a metal (aluminum or aluminum alloy or the like) wire into a predetermined length and plastic processing the cut wire. At this time, it is preferable that the terminal body 301 has a shape close to a square, for example, in order to manufacture without trimming. In this case, the maximum dimension of the terminal body 301 is the thickness of the container 100 (width in the Y-axis direction). Because it depends, it becomes a relatively small size. As described above, the electrode terminal 300 integrally including the shaft body 310 and the terminal body 301 can be manufactured by a relatively simple process.

  The current collector 130 has a terminal connection part 131 in which an opening 133 is formed, and a pair of leg parts 132 extending from the terminal connection part 131. The pair of leg parts 132 is as described above. Are joined to the positive electrode side end portion 411a of the electrode body 400.

  The upper insulating member 350 disposed between the cover plate 110 and the terminal body 301 has a cylindrical portion 358 (see FIG. 6) that forms an opening 352 through which the shaft body 310 passes. The cylindrical portion 358 has a role of maintaining airtightness between the shaft body 310 and the shaft hole 112 of the lid plate 110. That is, the upper insulating member 350 also has a role as a so-called gasket. The lower insulating member 380 is disposed between the current collector 130 and the lid plate 110 and insulates the current collector 130 and the lid plate 110. Each of the upper insulating member 350 and the lower insulating member 380 includes polypropylene (PP), polyethylene (PE), polyphenylene sulfide resin (PPS), polyether ether ketone (PEEK), tetrafluoroethylene / perfluoroalkyl vinyl ether (PFA). ), Polytetrafluoroethylene (PTFE), polybutylene terephthalate (PBT), or poly ether sulfone (PES).

  Further, in the present embodiment, the cover plate 110 on which the electrode terminal 300 is arranged has a first convex portion 114 and a second convex portion 115a that protrude in the same direction, as shown in FIG. 4, FIG. 5, and FIG. And 115b. A shaft hole 112 through which the shaft body 310 connected to the terminal main body 301 passes is formed in the first convex portion 114. The 1st convex part 114 has a function which suppresses the deformation | transformation of the cover board 110 by the pressing force at the time of the shaft body 310 being caulked, for example.

  Each of the 2nd convex parts 115a and 115b is arrange | positioned at the side of the 1st convex part 114, and is utilized for positioning or position control of the lower insulation member 380 in this Embodiment. Specifically, as shown in FIGS. 3 and 7, the lower insulating member 380 includes an engagement recess 385a that engages with the second protrusion 115a and an engagement recess 385b that engages with the second protrusion 115b. have.

  Moreover, each of the 1st convex part 114 and the 2nd convex parts 115a and 115b is formed in the bulging shape in the cover board 110, and a recessed part exists in the back side of these convex parts. Specifically, in the lid plate 110, a recess 113a is formed on the back of the second protrusion 115a, and a recess 113b is formed on the back of the second protrusion 115b.

  In the present embodiment, the recesses 113a and 113b are used for positioning and rotation prevention of the upper insulating member 350. Specifically, as shown in FIGS. 6 and 7, the upper insulating member 350 includes an engaging convex portion 359 a that engages with the concave portion 113 a and an engaging convex portion 359 b that engages with the concave portion 113 b. Yes.

  As shown in FIGS. 3, 6, and 7, the upper insulating member 350 further includes a side wall portion 351 that faces the end surface of the terminal body 301. The side wall portion 351 is a wall erected on the outer peripheral edge of the upper insulating member 350 and is formed so as to cover the periphery of the terminal body 301 in a plan view (when viewed from the Z-axis direction). Further, as described above, the upper insulating member 350 is prevented from rotating by engaging with the concave portions 113a and 113b of the lid plate 110. As a result, the upper insulating member 350 functions as a detent for the terminal body 301 (electrode terminal 300).

  In the electricity storage device 10 configured as described above, the second convex portions 115 a and 115 b are arranged at positions close to the first convex portion 114. Specifically, the arrangement positions of the second convex portions 115 a and 115 b according to the present embodiment are described as follows in relation to the size of the terminal main body 301.

  FIG. 8 is a diagram illustrating the arrangement positions of the second convex portions 115a and 115b according to the embodiment. In FIG. 8, the second convex portions 115a and 115b are represented by dots with circles, and the outer shape of the terminal main body 301 is indicated by a dotted line.

  As shown in FIG. 8, the second protrusions 115 a and 115 b are at positions where at least a part of the second protrusions 115 a and 115 b overlap with the terminal body 301 when viewed from the axial direction of the shaft body 310 (Z-axis direction in the present embodiment). Has been placed. In the present embodiment, the size of the terminal body 301 is relatively small. Therefore, the second convex portions 115a and 115b are arranged at positions relatively close to the first convex portion 114, as shown in FIGS. Further, the first convex portion 114 is formed with a tapered surface 116 that is inclined in a direction away from the second convex portion 115a at a portion adjacent to the second convex portion 115a. Further, the first convex portion 114 is formed with a tapered surface 116 that is inclined in a direction away from the second convex portion 115b at a portion adjacent to the second convex portion 115b.

  As described above, the power storage device 10 according to the present embodiment includes the container 100 and the electrode terminal 300 disposed in the container 100. The container 100 has the 1st convex part 114 and the 2nd convex parts 115a and 115b which protrude in the same direction from the wall part (cover plate 110) in which the terminal main body 301 which the electrode terminal 300 has of the container 100 is arrange | positioned. The first convex portion 114 has a shaft hole 112 through which the shaft body 310 connected to the terminal body 301 passes. Each of the second convex portions 115a and 115b is disposed at a position that is lateral to the first convex portion 114 and at least partially overlaps with the terminal body 301 when viewed from the axial direction of the shaft body 310. Has been. At least one of the first convex portion 114 and the second convex portion 115a or 115b is formed with a tapered surface 116 that is inclined in a direction away from the other side as the distance from the lid plate 110 increases in a portion adjacent to the other. . In the present embodiment, as described above, the tapered surface 116 is formed on the first convex portion 114.

  According to this configuration, in the cover plate 110, since the shaft hole 112 through which the shaft body 310 passes is formed in the first convex portion 114, deformation of the cover plate 110 due to, for example, caulking of the shaft body 310 is suppressed. The Further, for example, at a portion where the first convex portion 114 and the second convex portion 115a are adjacent, at least one of the first convex portion 114 and the second convex portion 115a (the first convex portion 114 in the present embodiment) is tapered. A surface 116 is provided. Therefore, for example, as shown in FIG. 4, the space between the first convex portion 114 and the second convex portion 115a has a trapezoidal shape, for example. Accordingly, even when the first convex portion 114 and the second convex portion 115a are brought close to each other, for example, the first convex portion 114 and the second convex portion 115a are substantially formed by plastic working using a mold. Is possible. More specifically, in this mold, the protruding portion, which is a portion corresponding to the portion between the first convex portion 114 and the second convex portion 115a, may be formed in a shape whose root is thicker than the tip portion. it can. Therefore, the mold can be provided with durability that can be used for actual production of the cover plate 110 having the first convex portion 114 and the second convex portion 115a arranged at positions close to each other.

  Here, for example, from the viewpoint of suppressing the manufacturing cost, in the present embodiment, as described above, the electrode terminal 300 integrally including the shaft body 310 and the terminal body 301 is manufactured by plastic working on the cut wire. Yes. In this case, the size of the terminal body 301 is relatively small, and as a result, the size of the insulating member disposed around the electrode terminal 300 is also relatively small. Specifically, in the present embodiment, the size of the upper insulating member 350 is reduced by reducing the size of the terminal main body 301, whereby the recess 113 a that engages with the upper insulating member 350 is compared with the shaft hole 112. It is necessary to form them at close positions. That is, the second convex portion 115 a located on the back side of the concave portion 113 a in the cover plate 110 is formed at a position relatively close to the first convex portion 114 and is used for positioning the lower insulating member 380.

  Further, even when the shaft body 310 and the terminal body 301 are separate bodies, for example, in order to meet the demand for miniaturization of the terminal structure of the power storage element 10, the second protrusion 115a is replaced with the first protrusion 114. There are cases where it is arranged near the position.

  Under such circumstances, even when the second convex portion 115a and the first convex portion 114 are arranged at close positions, according to the electricity storage device 10 according to the present embodiment, as described above, The mold for forming these convex portions can be made durable. That is, the feasibility of manufacturing the electricity storage element 10 as an actual product is also ensured.

  As described above, the power storage element 10 according to the present embodiment is a power storage element 10 including the container 100 and the electrode terminal 300 disposed in the container 100, and is a power storage element 10 capable of downsizing the terminal structure.

  In addition, the matter regarding the 2nd convex part 115a in said description and the following description is applied also to the 2nd convex part 115b.

  Further, in the electricity storage device 10 according to the present exemplary embodiment, the tapered surface 116 is formed on the first convex portion 114. Therefore, the second convex portion 115a does not need to have the tapered surface 116. Therefore, for example, as shown in FIGS. 5 and 7, the second convex portion 115 a can be formed in a shape having a side surface that rises substantially perpendicular to the cover plate 110 on the entire circumference. That is, the 2nd convex part 115a can be made into the shape which is easy to catch on the lower insulation member 380, for example. Therefore, the second convex portion 115a can be effectively used as a portion for positioning or position regulation of the lower insulating member 380.

  Further, in the electricity storage device 10 according to the present exemplary embodiment, the tapered surface 116 has the entire first convex portion 114 when viewed from the protruding direction of the first convex portion 114 as shown in FIGS. 5 and 8, for example. It is formed around the circumference.

  Here, if the tapered surface 116 is formed only on a part of the entire circumference of the first convex portion 114, the first convex portion 114 includes a portion that rises from the lid plate 110 at different angles. It becomes a shape. As a result, the mold for forming the first convex portion 114 becomes complicated, and it is difficult to form the first convex portion 114 with high accuracy. In this regard, in the energy storage device 10 according to the present embodiment, the tapered surface 116 is formed on the entire circumference of the first convex portion 114, and therefore the first convex portion 114 can be formed with high accuracy or easily.

  Moreover, in the electrical storage element 10 according to the present embodiment, the shaft body 310 has a caulking portion 311 disposed inside or outside the container 100 (inward in the present embodiment) (see FIG. 7). The 1st convex part 114 and the 2nd convex part 115a are formed in the protruding shape toward the side (inward of the container 100) from which the crimping part 311 is arrange | positioned from the cover board 110. As shown in FIG.

  Here, when the shaft body 310 is caulked, the lid plate 110 is less likely to be deformed by caulking from the protruding direction of the first convex portion 114 in which the shaft hole 112 is formed. That is, when the protruding direction of the first convex portion 114 is inward of the container 100 as in the present embodiment, when the shaft body 310 integrally provided on the electrode terminal 300 is caulked and joined to the current collector 130 The deformation of the lid plate 110 is more reliably suppressed.

  Moreover, in the electrical storage element 10 according to the present embodiment, a concave portion 113a having a size corresponding to the second convex portion 115a is formed at a position on the back side of the second convex portion in the cover plate 110.

  As described above, the second convex portions 115a and the concave portions 113a having shapes corresponding to the thickness direction of the lid plate 110 are, for example, plastic processing (half punching processing, embossing processing, burring processing, bead processing, drawing processing) on the lid plate 110. Etc.) at the same time. In the present embodiment, since the second convex portion 115a protrudes inward of the container 100, the concave portion 113a on the back side of the second convex portion 115a can be used to prevent the upper insulating member 350 from rotating. . In this case, the recess 113a functions as a detent for the electrode terminal 300 via the upper insulating member 350 as described above.

  The power storage element 10 according to the embodiment has been described above, but the power storage element 10 may have a structure different from the structure illustrated in FIGS. Thus, hereinafter, a modified example of the structure around the electrode terminal 300 in the power storage element 10 will be described focusing on differences from the above embodiment.

(Modification)
FIG. 9 is a partial cross-sectional view of power storage element 10a according to a modification of the embodiment. Specifically, FIG. 9 illustrates a partial cross section of the electricity storage element 10a at a position corresponding to FIG.

  In the power storage element 10 a shown in FIG. 9, an upper insulating member 350 a is disposed between the terminal main body 301 of the electrode terminal 300 a and the lid plate 110 a that is a part of the container 100, and a shaft body connected to the terminal main body 301. 138 is disposed through the shaft hole 112 of the lid plate 110a. About these structures, it is common in the electrical storage element 10 which concerns on the said embodiment.

  However, power storage element 10a according to the present modification is different from power storage element 10 according to the above-described embodiment in that shaft body 138 is caulked outside container 100. More specifically, in the present modification, the current collector 130 a has a shaft body 138 joined to the terminal connection portion 131. The distal end portion of the shaft body 138 is caulked in a state of penetrating the joint hole 302 of the terminal main body 301a included in the electrode terminal 300a, whereby the caulking portion 139 is formed.

  As described above, in the electric storage element 10a having a structure in which the shaft body 138 is caulked outside the container 100, the lid plate 110 includes the first convex portion 114, the second convex portion 115a, and the second convex portion 115a that protrude outward from the container 100. 115b. That is, the 1st convex part 114 and the 2nd convex part 115a are formed in the protruding shape toward the side (outside of the container 100) where the crimping part 139 is arrange | positioned from the cover board 110. As shown in FIG.

  Therefore, similarly to the above-described embodiment, the first convex portion 114 more reliably suppresses deformation of the cover plate 110 due to the pressing force when the shaft body 138 is caulked. In this case, the metal piece (contamination) generated during caulking is difficult to adhere to the inside of the lid plate 110, which is advantageous in that the possibility of contamination remaining in the container 100 is reduced. .

  Further, the upper insulating member 350a is formed with an engagement recess 357a that engages with the second protrusion 115a and an engagement recess 357b that engages with the second protrusion 115b. Thereby, the 2nd convex parts 115a and 115b function as a rotation stop of terminal body 301a (electrode terminal 300a) via upper insulating member 350a.

  Further, concave portions 113a and 113b are formed on the back side of the second convex portions 115a and 115b in the cover plate 110a, and the lower insulating member 380a has an engaging convex portion 386a that engages with the concave portion 113a, and a concave portion. An engaging convex portion 386b that engages with 113b is formed. Accordingly, the recesses 113a and 113a can be used for positioning the lower insulating member 380a.

  Further, in the electricity storage device 10a configured as described above, at least one of the first convex portion 114 and the second convex portion 115a or 115b is located at a portion adjacent to the other from the other side as the distance from the cover plate 110 increases. A tapered surface 116 that is inclined in the direction of leaving is formed. In this modification, a tapered surface 116 is formed on the first convex portion 114. Therefore, as in the above embodiment, in order to meet the demand for downsizing of the terminal body 301a or downsizing of the terminal structure in the power storage element 10a, for example, the first convex part 114 and the second convex part 115a are placed close to each other. Even in this case, the first convex portion 114 and the second convex portion 115a can be substantially formed by press working using a mold. That is, the power storage element 10a according to the present modification is a power storage element 10a including the container 100 and the electrode terminal 300a disposed in the container 100, and is a power storage element 10a capable of reducing the size of the terminal structure.

(Other embodiments)
As described above, the power storage device according to the present invention has been described based on the embodiment and the modifications thereof. However, the present invention is not limited to the above-described embodiments and modifications. Without departing from the gist of the present invention, various modifications conceived by those skilled in the art may be applied to the above-described embodiment or modification, or a form constructed by combining a plurality of the constituent elements described above. It is included in the range.

  For example, in the cover plate 110 according to the embodiment, only one of the second protrusions 115a and 115b may be formed on the side of the first protrusion 114. That is, it is not essential that a plurality of second protrusions are formed on the cover plate 110 on which the electrode terminals 300 are arranged. Accordingly, a plurality of recesses formed on the back side of the second protrusions are also formed. Is not required.

  Even when only one second convex portion is present on the side of the first convex portion 114, at least one of the first convex portion 114 and the second convex portion is inclined away from the other as the distance from the cover plate 110 increases. By forming the tapered surface, as described above, the feasibility of forming these two convex portions is ensured.

  Further, for example, a tapered surface that is inclined in a direction away from the other may be formed on both the first convex portion 114 and the second convex portion 115a. In this case, the width of the base of the protrusion corresponding to the space between the two protrusions in the mold for forming these two protrusions is increased. Thereby, the durability of the mold is further improved.

  Moreover, the convex part or recessed part of the cover plate 110 and the recessed part or convex part of an insulating member which are in a mutually engaging relationship do not need to contact. For example, the engagement recess 385a of the lower insulating member 380 is engaged with the second protrusion 115a provided on the cover plate 110, but the second protrusion 115a is in contact with the inner surface of the engagement recess 385a. It does not have to be. That is, the 2nd convex part 115a can play a role, such as positioning of the lower insulation member 380, by being located inside the engaging recessed part 385a. Further, since the second convex portion 115a is not in contact with the inner surface of the engaging concave portion 385a, for example, heat generated when the lid plate 110 and the container body 101 are welded from the lid plate 110 to the lower insulating member 380. It becomes difficult to convey. Thereby, damage to the lower insulating member 380 due to heat during welding is suppressed. The supplementary matter regarding the second convex portion 115a and the engaging concave portion 385a also applies to other combinations of convex portions and concave portions (for example, the engaging convex portion 359a of the upper insulating member 350 and the concave portion 113a of the cover plate 110). Is done.

  Further, when the first convex portion and the second convex portion are arranged at positions close to each other in the wall portion of the container of the power storage element, the first convex portion and the second convex portion regardless of the size of the power storage element. At least one may have a tapered surface that is inclined in a direction away from the other as the distance from the wall portion increases. Thereby, the feasibility of manufacturing the container having the first convex portion and the second convex portion is ensured.

  Further, the upper insulating member 350 interposed between the terminal body 301 and the container 100 may be integrated with the lower insulating member 380. For example, the upper insulating member 350 and the lower insulating member 380 integrated with the lid plate 110 of the container 100 may be manufactured by insert molding.

  In addition, the supplementary matter regarding the lid plate 110 according to the embodiment described above may be applied to the lid plate 110a according to the above modification. In addition, embodiments constructed by arbitrarily combining the configurations described in the above embodiments and modifications are also included in the scope of the present invention.

  Further, the present invention can be realized not only as the above-described power storage element, but also as a power storage device including a plurality of the power storage elements.

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

10, 10a Storage element 100 Container 101 Container body 110, 110a Cover plate 112 Axial hole 113a, 113b Concave 114 First convex 115a, 115b Second convex 116 Tapered surface 120, 130, 130a Current collector 131 Terminal connection 132 Leg part 133,352,382 Opening part 138,310 Shaft body 139,311 Caulking part 200,300,300a Electrode terminal 250,350,350a Upper insulation member 301,301a Terminal body 302 Joining hole 351 Side wall part 357a, 357b, 385a 385b Engaging recess 358 Cylindrical portion 359a, 359b, 386a, 386b Engaging projection 380, 380a Lower insulating member 400 Electrode body 411a Positive electrode side end 421a Negative electrode side end

Claims (5)

A storage element comprising a container and an electrode terminal disposed in the container,
The container has a first protrusion and a second protrusion that protrude in the same direction from a wall portion of the container where the terminal main body of the electrode terminal is disposed.
The first protrusion has a shaft hole through which a shaft connected to the terminal body passes,
The second convex portion is a side of the first convex portion, and when viewed from the axial direction of the shaft body, at least a part thereof is disposed at a position overlapping the terminal body,
At least one of the first convex portion and the second convex portion is formed with a tapered surface that is inclined in a direction away from the other as the distance from the wall portion increases in a portion adjacent to the other. The electrical storage element according to claim 1, wherein the tapered surface is formed on the first convex portion. The electric storage element according to claim 1, wherein the tapered surface is formed on an entire circumference of the first convex portion when viewed from a protruding direction of the first convex portion. The shaft body has a caulking portion disposed inside or outside the container,
The electrical storage according to any one of claims 1 to 3, wherein the first convex portion and the second convex portion are formed so as to protrude from the wall portion toward a side where the caulking portion is disposed. element. The electrical storage element as described in any one of Claims 1-4 in which the recessed part is formed in the position of the back side of the said 2nd convex part in the said wall part.

Images