JP2019145294A - Power storage element - Google Patents

Abstract

To provide a power storage element capable of facilitating a joining operation of a liquid stopper.SOLUTION: A power storage element 10 including a container 100 includes a liquid injection part 310 provided so as to protrude from the surface 113 of the container 100 and in which an electrolytic solution inlet 311 is formed, and a liquid injection stopper 320 that covers the inlet 311 in a state of being separated from the inner surface 311a of the inlet 311, and the liquid injection stopper 320 is disposed in contact with the side surface 313 of the liquid injection part 310.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a power storage device including a liquid injection part in which a liquid injection port is formed, and a liquid injection stopper covering the liquid injection port.

  2. Description of the Related Art Conventionally, an electricity storage device that includes a liquid injection portion in which a liquid injection port is formed and a liquid injection plug that covers the liquid injection port is widely known. For example, Patent Document 1 discloses a sealed battery (storage element) including a container in which a liquid injection hole (liquid injection port) is formed and a sealing plug (liquid injection plug) that seals the liquid injection hole. Is disclosed. In this sealed battery, the sealing plug has a press-fitting member that is press-fitted into the liquid injection hole to close the liquid injection hole, and maintains the sealing property of the liquid injection hole for a long period of time.

JP 2014-170648 A

  However, the inventor of the present application has found that there is a problem that the operation of joining the liquid filling plug becomes difficult in the configuration of the conventional power storage element. For example, in Patent Document 1, since the press-fitting member of the sealing plug is press-fitted into the liquid injection hole to close the liquid injection hole, the electrolytic solution in the container passes through the press-fitting member and the liquid injection hole. May crawl up from. If the electrolyte rises from the injection hole, it is necessary to perform a joining operation so as not to cause a joining failure between the sealing plug and the container, which makes the joining operation difficult.

  This invention is made | formed in view of the said problem, and it aims at providing the electrical storage element which can make the joining operation | work of an injection stopper easy.

  In order to achieve the above object, a power storage element according to one embodiment of the present invention is a power storage element including a container, which is provided so as to protrude from the surface of the container and has a liquid injection port formed therein. And a liquid injection stopper that covers the liquid injection opening in a state of being separated from the inner surface of the liquid injection opening, and the liquid injection stopper is disposed in contact with a side surface of the liquid injection section.

  According to this, the electricity storage element includes a liquid injection part that protrudes from the surface of the container, and a liquid injection stopper that covers the liquid injection port in a state of being separated from the inner surface of the liquid injection port formed in the liquid injection part. The liquid injection stopper is disposed in contact with the side surface of the liquid injection part. Thus, even in a state where the liquid injection stopper is spaced from the inner surface of the liquid injection port, the liquid injection part protrudes from the surface of the container, and the liquid injection stopper is disposed in contact with the side surface of the liquid injection part. The injection stopper can be positioned. Accordingly, since the injection plug can be positioned without providing the injection plug with a portion like the press-fitting member of Patent Document 1, the electrolytic solution scoops the injection port during the injection plug joining operation. It can suppress rising. In addition, since the liquid injection part is provided so as to protrude from the surface of the container, the liquid injection port is disposed at a position protruding from the surface of the container. I can suppress crawling up my mouth. By these, the joining operation | work of an injection stopper can be made easy.

  The liquid injection stopper may be disposed in contact with a plurality of locations on the side surface of the liquid injection portion.

  According to this, in the electric storage element, the liquid injection stopper is disposed in contact with a plurality of positions on the side surface of the liquid injection part. Thereby, since the positioning of the liquid injection stopper can be easily performed during the operation of joining the liquid injection stopper, the operation of joining the liquid injection stopper can be facilitated.

  The liquid injection stopper may be disposed so as to be fitted with the liquid injection part.

  According to this, in the electric storage element, the liquid injection stopper is fitted and arranged with the liquid injection part. Thereby, since the positioning of the liquid injection stopper can be performed more easily during the operation of joining the liquid injection stopper, the operation of joining the liquid injection stopper can be facilitated.

  The liquid injection stopper has a side wall portion disposed along a side surface of the liquid injection portion, and a bottom wall portion extending outward from the side wall portion along the surface of the container, The wall may be joined to the surface of the container.

  According to this, the injection stopper has a side wall part and a bottom wall part, and the bottom wall part is joined to the surface of the container. In this way, by joining the bottom wall portion of the liquid injection stopper to the surface of the container, the joint location can be separated from the liquid injection port. As a result, even if the electrolytic solution crawls up the liquid injection port, it is possible to suppress the electrolytic solution from reaching the joint location, and therefore, the operation of joining the liquid injection stopper can be facilitated.

  The liquid injection part further includes an inner surface of the liquid injection port, a liquid injection part surface connecting the inner surface and the side surface, and a corner between the liquid injection part surface and the side surface. A taper portion or a round portion larger than a corner portion between the surface of the liquid injection portion and the inner surface may be formed.

  According to this, in the liquid injection part, the corner part between the liquid injection part surface and the side surface has a larger taper part or rounded part than the corner part between the liquid injection part surface and the inner surface of the liquid injection port. Is formed. As described above, since the large tapered portion or the rounded portion is formed at the corner portion on the side surface side of the liquid injection portion, the liquid injection plug interferes with the corner portion when the liquid injection plug is disposed in the liquid injection portion. Even then, the liquid injection stopper slides at the taper portion or the rounded portion, and the liquid injection stopper is guided to the arrangement position. Thereby, since an injection stopper can be easily arrange | positioned with respect to an injection part, the joining operation | work of an injection stopper can be made easy.

  The present invention can be realized not only as a power storage element, but also as a liquid injection part and a liquid injection stopper provided in the power storage element.

  According to the electricity storage device of the present invention, it is possible to facilitate the operation of joining the liquid filling tap.

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 which decomposes | disassembles and shows each component with which the electrical storage element which concerns on embodiment is provided. It is the perspective view and sectional drawing which show the structure of the liquid injection part which concerns on embodiment. It is the perspective view and sectional drawing which show the structure of the injection stopper which concerns on embodiment. It is sectional drawing which shows the structure in the state which attached the injection stopper which concerns on embodiment to the injection part.

  Hereinafter, a power storage device according to an embodiment of the present invention will be described with reference to the drawings. It should be noted that the embodiments described below show comprehensive or specific examples. 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 are merely examples, and are not intended to limit the present invention. In addition, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims indicating the highest concept are described as optional constituent elements. In each drawing, dimensions and the like are not strictly illustrated.

  In the following description and drawings in the embodiments, the direction in which the pair of electrode terminals (positive electrode terminal and negative electrode terminal) of the power storage element is arranged, and the pair of current collectors (positive electrode current collector and negative electrode current collector) The alignment direction, the opposing direction of the short side surface of the container, or the extending direction (longitudinal direction) of the lid of the container is defined as the X-axis direction. The opposing direction of the long side of the container, the short direction of the short side of the container, the short direction of the lid of the container, or the thickness direction of the container is defined as the Y-axis direction. Further, the direction in which the container body and the lid of the power storage element are arranged, the thickness direction of the lid, the longitudinal direction of the short side surface of the container, 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 Power Storage Element 10]
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 showing the components included in the electricity storage device 10 according to the present embodiment in an exploded manner.

  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 is used, for example, for an automobile power source such as an electric vehicle (EV), a hybrid electric vehicle (HEV), or a plug-in hybrid electric vehicle (PHEV), an electronic device power source, and a power storage power source. 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 not a secondary battery but a primary battery that can use stored electricity without being charged by a user. Further, the power storage element 10 may be a battery using a solid electrolyte. Further, in the present embodiment, a rectangular parallelepiped (rectangular) power storage element 10 is illustrated, but the shape of the power storage element 10 is not limited to a rectangular parallelepiped shape, and may be a cylindrical shape, a long cylindrical shape, or the like. Alternatively, a laminate type power storage element may be used.

  As shown in FIG. 1, the electricity storage device 10 includes a container 100 having a lid 110 and a container body 120, and positive and negative electrode terminals 200. Further, as shown in FIG. 2, an electrode body 400 and a positive and negative electrode current collector 500 are accommodated inside the container 100.

  Note that a gasket or the like is disposed between the lid 110 and the electrode terminal 200 and between the lid 110 and the current collector 500 in order to improve insulation and airtightness. These are omitted for illustration. Moreover, although electrolyte solution (nonaqueous electrolyte) is enclosed inside the container 100, illustration is abbreviate | omitted. In addition, as long as the said electrolyte solution 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. In addition to the above-described components, a spacer disposed on the side of the current collector 500, an insulating film that wraps the electrode body 400, or the like may be disposed.

  The container 100 is a rectangular parallelepiped (square) case having a container main body 120 in which an opening is formed and a lid 110 that closes the opening of the container main body 120. The container main body 120 is a rectangular cylindrical member that constitutes the main body of the container 100 and has a bottom, two flat and rectangular long side surfaces on both sides in the Y-axis direction, and side surfaces on both sides in the X-axis direction. It has two flat and rectangular short side surfaces, and a flat and rectangular bottom surface on the negative side in the Z-axis direction. The lid 110 is a flat and rectangular member extending in the X-axis direction that constitutes the lid of the container 100, and is disposed on the plus side of the container body 120 in the Z-axis direction.

  Specifically, the container 100 has a structure in which the inside of the container 100 is sealed by welding the electrode body 400 and the like inside the container body 120 and then joining the container body 120 and the lid body 110 by welding or the like. ing. The material of the container 100 (the container main body 120 and the lid body 110) is not particularly limited, but is preferably a weldable (joinable) metal such as stainless steel, aluminum, aluminum alloy, iron, or plated steel. The lid body 110 and the container body 120 are preferably formed of the same material, but may be formed of different materials.

  In addition, the lid 110 is provided with a gas discharge valve 111 at the center, and a liquid injection facility 300 is provided between the gas discharge valve 111 and the electrode terminal 200. The gas discharge valve 111 is a part (safety valve) that releases the pressure inside the container 100 when the pressure inside the container 100 rises. That is, the gas discharge valve 111 has a thin portion, and when the internal pressure of the container 100 reaches a predetermined opening pressure, the thin portion is broken and opened, so that the internal pressure of the container 100 is reduced. Opened.

  The liquid injection facility 300 is a facility for injecting an electrolytic solution into the container 100 at the time of manufacturing the power storage element 10. In the present embodiment, the liquid injection facility 300 is disposed near the minus side of the X axis direction of the lid 110 and at the center position in the Y axis direction. In addition, the arrangement | positioning position of the liquid injection equipment 300 is not specifically limited, You may arrange | position in any position of the cover body 110, and may be arrange | positioned at the container main body 120. FIG. That is, the liquid injection facility 300 may be disposed at any position of the container 100 as long as the electrolytic solution can be injected into the container 100.

  Here, as shown in FIG. 2, the liquid injection facility 300 includes a liquid injection part 310 and a liquid injection stopper 320. The liquid injection part 310 is a part having a liquid injection port through which an electrolytic solution is injected, and is provided so as to protrude from the surface of the lid 110. The liquid injection stopper 320 is a part constituting a lid that covers the liquid injection part 310 (covers the liquid injection port). That is, at the time of manufacturing the electricity storage device 10, the electrolytic solution is injected into the container 100 from the injection unit 310, the injection plug 320 is welded to the lid 110, and the injection port is closed. Housed in a container 100. A detailed description of the configuration of the liquid injection facility 300 (the liquid injection part 310 and the liquid injection stopper 320) will be described later.

  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 positive electrode active material layer is formed on a positive electrode base material layer which 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 negative electrode active material layer 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.

  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. Further, the electrode body 400 may have a shape wound with the X-axis direction as the winding axis as shown in FIG. 2, or may have a shape wound with the Z-axis direction as the winding axis, Instead of the wound type, it may have a laminated type in which flat plate plates are laminated, a zigzag shape in which the electrode plates are folded in a bellows shape, or the like.

  The electrode terminal 200 is a terminal (positive electrode terminal and negative electrode terminal) that is electrically connected to the positive electrode plate and the negative electrode plate of the electrode body 400 via the current collector 500. In other words, the electrode terminal 200 leads the electricity stored in the electrode body 400 to the external space of the electricity storage element 10 and introduces electricity into the internal space of the electricity storage element 10 in order to store electricity in the electrode body 400. This is a metal member. Further, the electrode terminal 200 is attached to a lid body 110 disposed above the electrode body 400. Specifically, as shown in FIG. 2, the electrode terminal 200 is caulked by inserting the shaft portion 210 into the through hole 112 of the lid body 110 and the through hole 510 of the current collector 500. Along with the current collector 500, the lid body 110 is fixed. The electrode terminal 200 is made of aluminum, an aluminum alloy, copper, a copper alloy, or the like.

  The current collector 500 is a member (a positive electrode current collector and a negative electrode current collector) that is disposed on both sides of the electrode body 400 in the X-axis direction and connected to the ends of the electrode body 400 on both sides in the X-axis direction. Specifically, the current collector 500 is disposed between the electrode body 400 and the side wall of the container body 120, and has electrical conductivity and rigidity that are electrically connected to the positive electrode plate or the negative electrode plate of the electrode body 400. It is a member. The material of the current collector 500 is not limited. For example, the current collector 500 on the positive electrode side is formed of a metal member such as aluminum or an aluminum alloy as in the case of the positive electrode base material layer of the electrode body 400. The current collector 500 is formed of a metal member such as copper or a copper alloy, like the negative electrode base material layer of the electrode body 400.

[2 Detailed Description of Composition of Liquid Injection Equipment 300]
[2.1 Description of Liquid Injection Unit 310]
Next, the configuration of the liquid injection facility 300 (the liquid injection part 310 and the liquid injection stopper 320) will be described in detail. First, the configuration of the liquid injection unit 310 will be described. FIG. 3 is a perspective view and a cross-sectional view showing the configuration of the liquid injection unit 310 according to the present embodiment. Specifically, FIG. 3A is an enlarged perspective view showing the configuration of the liquid injection unit 310 in FIG. 2, and FIG. 3B is the liquid injection unit of FIG. It is sectional drawing which shows the structure at the time of cut | disconnecting 310 by a IIIb-IIIb cross section.

  As shown in FIG. 3, liquid injection unit 310 is provided so as to protrude from the surface of container 100 (in this embodiment, surface 113 of lid 110). That is, the liquid injection part 310 is a convex part formed integrally with the lid 110 by causing a part of the lid 110 to protrude by, for example, pressing. The projecting height of the liquid injection part 310 (height from the surface 113 of the lid 110) is not particularly limited, but is preferably about 3 times or less the thickness of the lid 110 from the viewpoint of moldability and the like. More preferably, it is about 3 mm to 0.4 mm.

  The liquid injection part 310 may not be formed integrally with the lid body 110 but may be formed separately from the lid body 110 and joined to the lid body 110 by welding or the like. When the liquid injection part 310 is configured separately from the lid 110, the material of the liquid injection part 310 is not particularly limited, but the material that can be welded to the lid 110, such as the same material as the lid 110, etc. Is preferred.

  Here, an injection port 311 for an electrolytic solution is formed in the injection unit 310. That is, the liquid injection part 310 has a cylindrical shape (in this embodiment) having an inner surface 311a that is an inner peripheral surface of the liquid injection port 311, a liquid injection part surface 312 that is a distal end surface, and a side surface 313 that is an outer peripheral surface. , Cylindrical or chimney-like).

  The liquid injection port 311 is a through-hole having a circular shape when viewed from above, and is used to inject the electrolytic solution into the container 100 through the liquid injection port 311. Here, the top view is when viewed from the positive side in the Z-axis direction, and for example, the circular shape when viewed from the top side means that it has a circular shape when viewed from the positive side in the Z-axis direction. . The shape of the liquid injection port 311 is not particularly limited, and has any shape as long as it can be injected, such as an elliptical shape, an oval shape, a rectangular shape, and other polygonal shapes when viewed from above. It doesn't matter. In other words, in the present embodiment, the inner surface 311a is formed by a curved surface having an outer edge that is circular when viewed from above, extending in the Z-axis direction, but an outer edge that is polygonal when viewed from above is extended in the Z-axis direction. It may be formed by a flat surface. In the present embodiment, the inner surface 311a (or the liquid injection port 311) extends in the same shape in the Z-axis direction. For example, the inner surface 311a (or the liquid injection port 311) increases or decreases in diameter toward the positive side in the Z-axis direction. Or it may change to a different shape as it goes to the Z-axis direction plus side.

  The liquid injection surface 312 is a surface that connects the inner surface 311 a and the side surface 313. In the present embodiment, the liquid injection part surface 312 is an annular flat surface as viewed from above, but may be a flat surface such as a polygonal ring when viewed from above or a curved surface.

  The side surface 313 is a wall surface provided upright from the planar surface 113 of the lid 110. In the present embodiment, like the inner surface 311a, the side surface 313 is formed by a curved surface with a circular outer edge in the top view extending in the Z-axis direction. It may be formed by an extended plane. In the present embodiment, the side surface 313 extends in the same shape in the Z-axis direction. For example, the side surface 313 may increase or decrease in diameter toward the plus side in the Z-axis direction. It may change to a different shape as it goes to the direction plus side.

  Here, a corner portion 314 is provided at a boundary portion between the inner surface 311 a and the liquid injection portion surface 312, and a corner portion 315 is provided at a boundary portion between the liquid injection portion surface 312 and the side surface 313. . That is, the corner portion 314 is an inner corner portion at the tip of the liquid injection portion 310, and the corner portion 315 is an outer corner portion of the tip of the liquid injection portion 310. In the present embodiment, the corner portion 314 and the corner portion 315 are formed with curved outer edge shapes in a cross section when cut along a plane parallel to the Z-axis direction (for example, a plane passing through the central axis of the liquid injection unit 310). Is the Earl part. Specifically, the corner portion 315 is a rounded portion that is larger than the corner portion 314. That is, the corner portion 315 is formed to have a larger radius of curvature (the rounded surface is wider) in the outer edge shape of the cross section than the corner portion 314.

  In addition, the corner | angular part 314 and the corner | angular part 315 are the taper part in which the outer edge shape of the cross section at the time of cut | disconnecting in the plane (for example, plane passing through the central axis of the liquid injection part 310) parallel to a Z-axis direction was formed in the straight line. It may be. In this case, the corner portion 315 is a tapered portion larger than the corner portion 314. That is, the corner portion 315 is formed to have a longer taper length (wider taper surface) than the corner portion 314 in the outer edge shape of the cross section. Thus, a taper portion or a rounded portion larger than the corner portion 314 between the liquid injection portion surface 312 and the inner surface 311a is formed at the corner portion 315 between the liquid injection portion surface 312 and the side surface 313. .

[2.2 Description of the structure of the injection stopper 320]
Next, the configuration of the liquid injection stopper 320 will be described in detail. FIG. 4 is a perspective view and a cross-sectional view showing the configuration of the liquid filling tap 320 according to the present embodiment. Specifically, FIG. 4A is an enlarged perspective view showing the configuration of the liquid injection stopper 320 in FIG. 2, and FIG. 4B is the liquid injection stopper in FIG. It is sectional drawing which shows the structure at the time of cut | disconnecting 320 by IVb-IVb cross section. FIG. 5 is a cross-sectional view showing a configuration in a state where the liquid injection stopper 320 according to the present embodiment is attached to the liquid injection part 310.

  The injection plug 320 is a member that is joined to the lid 110 by welding or the like in a state where the injection port 311 is closed. In addition, although the material of the liquid injection stopper 320 is not specifically limited, For example, it is formed with the metal which can be welded to the cover body 110, such as stainless steel, aluminum, an aluminum alloy, iron, and a plated steel plate similarly to the material of the cover body 110. ing.

  Here, as shown in FIGS. 4 and 5, the liquid injection stopper 320 has an upper wall portion 321, a side wall portion 322, and a bottom wall portion 323. The upper wall portion 321 is an upper wall having a circular shape and a plate shape (disc shape) when viewed from above and disposed above the liquid injection stopper 320 (a portion on the positive side in the Z-axis direction), and covers the upper portion of the liquid injection port 311. As described above, the liquid injection unit 310 is disposed above. Specifically, the upper wall portion 321 is disposed away from the liquid injection portion 310 (that is, away from the inner surface 311a of the liquid injection port 311).

  The side wall portion 322 is a cylindrical side wall that is annular in a top view and is extended in the Z-axis direction, which is disposed in the central portion of the liquid injection stopper 320 in the Z-axis direction, and surrounds the periphery of the liquid injection portion 310. It arrange | positions along the side surface 313 of the liquid injection part 310. FIG. Specifically, the side wall part 322 is provided so as to protrude from the side surface 313 to the plus side in the Z-axis direction, and is disposed so as to cover the entire circumference of the side surface 313. Further, the side wall portion 322 is disposed in contact with the side surface 313. Specifically, the side wall 322 is disposed in contact with a plurality of locations on the side surface 313. In the present embodiment, the side wall portion 322 is disposed so as to be fitted to the side surface 313.

  The bottom wall portion 323 is an annular (doughnut-shaped) and plate-like bottom wall as viewed from above, disposed below the liquid injection stopper 320 (a portion on the negative side in the Z-axis direction). Is arranged so as to extend outward. Specifically, the bottom wall portion 323 extends outward from the end portion of the side wall portion 322 on the minus side in the Z-axis direction along the surface 113 of the lid body 110 and is placed on the surface 113 of the lid body 110. Is done.

  Further, the bottom wall portion 323 is joined to the surface 113 of the container 100. Specifically, the outer edge 323 a of the bottom wall portion 323 is joined to the surface 113 of the lid body 110, thereby forming a joined portion 330. In the present embodiment, joint portion 330 is a welded portion formed by laser welding. That is, since the outer edge 323a is an outer peripheral edge having a circular shape when viewed from the top surface of the bottom wall portion 323, the joint portion 330 is a welded portion having an annular shape when viewed from the upper surface formed at the position of the outer edge 323a.

  In addition, the junction part 330 should just be a shape corresponding to the shape of the outer edge 323a, and is not limited to a top view annular shape. In addition, the joining portion 330 is not formed at the position of the outer edge 323a, but is formed by being welded to the surface 113 of the lid 110 through the bottom wall portion 323 at a position other than the outer edge 323a. Also good. In this case, the shape of the joint portion 330 does not correspond to the shape of the outer edge 323a and may be any shape. Further, the joint portion 330 is not limited to a weld portion formed by laser welding, and is, for example, mechanical by resistance welding, ultrasonic joining, adhesion with an adhesive or double-sided tape, welding by thermal welding, caulking, or the like. It may be a joint part formed by a simple joining or other joining method.

  Thus, the liquid injection stopper 320 is a cap-shaped (hat-shaped) member that covers the liquid injection port 311 in a state of being separated from the inner surface 311 a of the liquid injection port 311. The liquid injection stopper 320 is disposed in contact with the side surface 313 of the liquid injection part 310. Specifically, the injection plug 320 is disposed in contact with a plurality of locations on the side surface 313 of the injection unit 310. More specifically, the liquid injection stopper 320 is disposed so as to be fitted with the liquid injection part 310.

[3 Description of effects]
As described above, the power storage device 10 according to the embodiment of the present invention includes the liquid injection part 310 provided to protrude from the surface 113 of the container 100 and the inner surface 311a of the liquid injection port 311 formed in the liquid injection part 310. The liquid injection plug 320 covers the liquid injection port 311 in a state of being separated from the liquid injection port 311, and the liquid injection plug 320 is disposed in contact with the side surface 313 of the liquid injection part 310. Thus, even when the injection plug 320 is separated from the inner surface 311 a of the injection port 311, the injection section 310 is provided so as to protrude from the surface 113 of the container 100, and the injection plug 320 is provided on the side surface 313 of the injection section 310. The liquid injection stopper 320 can be positioned by being disposed in contact with the liquid injection stopper 320. Accordingly, since the liquid injection stopper 320 can be positioned without providing the liquid injection stopper 320 with a portion such as a shaft portion inserted into the liquid injection port 311, It is possible to suppress the liquid from creeping up the liquid injection port 311. In addition, since the liquid injection part 310 is provided so as to protrude from the surface 113 of the container 100, the liquid injection port 311 is disposed at a position protruding from the surface 113 of the container 100. Sometimes, the electrolytic solution can be suppressed from creeping up the liquid injection port 311. By these, the joining operation | work of the liquid injection stopper 320 can be made easy.

  Further, in the electric storage element 10, the liquid injection plug 320 is disposed in contact with a plurality of locations on the side surface 313 of the liquid injection part 310. Thereby, since the positioning of the liquid injection stopper 320 can be easily performed during the operation of joining the liquid injection stopper 320, the operation of joining the liquid injection stopper 320 can be facilitated.

  Further, in the electric storage element 10, the liquid injection plug 320 is disposed so as to be fitted with the liquid injection part 310. Thereby, since the positioning of the liquid injection stopper 320 can be performed more easily during the operation of joining the liquid injection stopper 320, the operation of joining the liquid injection stopper 320 can be facilitated.

  The liquid injection stopper 320 has a side wall part 322 and a bottom wall part 323, and the bottom wall part 323 is joined to the surface 113 of the container 100. In this way, by joining the bottom wall portion 323 of the liquid injection stopper 320 to the surface 113 of the container 100, the joint location can be separated from the liquid injection port 311. As a result, even if the electrolytic solution crawls up the liquid injection port 311, it is possible to suppress the electrolytic solution from reaching the joint location, so that the operation of joining the liquid injection plug 320 can be facilitated.

  Further, in the liquid injection part 310, the corner 315 between the liquid injection part surface 312 and the side surface 313 has a larger taper than the corner part 314 between the liquid injection part surface 312 and the inner surface 311 a of the liquid injection port 311. Part or round part is formed. Thus, since the large tapered portion or the rounded portion is formed in the corner portion 315 on the side surface 313 side of the liquid injection part 310, the liquid injection plug 320 is arranged when the liquid injection stopper 320 is arranged in the liquid injection part 310. Even if it interferes with the corner portion 315, the liquid injection stopper 320 slides at the taper portion or the rounded portion, and the liquid injection stopper 320 is guided to the arrangement position. Thereby, since the liquid injection stopper 320 can be easily arrange | positioned with respect to the liquid injection part 310, the joining operation | work of the liquid injection stopper 320 can be made easy.

[4 Description of Modification]
The power storage element 10 according to the embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment. That is, the embodiment disclosed this time should be considered as illustrative in all points and not restrictive. 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 embodiment, the liquid injection stopper 320 does not have a shaft portion that is inserted into the liquid injection port 311. However, if the shaft portion does not contact the inner surface 311a of the liquid injection port 311 (if the shaft portion is in a state of being separated from the inner surface 311a of the liquid injection port 311), the shaft portion of the liquid injection plug 320 is concerned. You may have.

  Moreover, in the said embodiment, the liquid injection stopper 320 was fitted and arrange | positioned with the liquid injection part 310. FIG. However, the liquid injection stopper 320 only needs to be disposed in contact with at least one place on the side surface 313 of the liquid injection part 310.

  In the above embodiment, the liquid injection stopper 320 has the bottom wall 323 joined to the surface 113 of the container 100. However, the liquid injection stopper 320 may be joined to the container 100 at a place other than the bottom wall portion 323. For example, the liquid injection stopper 320 may have the side wall part 322 joined to the side surface 313 of the liquid injection part 310. Further, the liquid injection stopper 320 may be configured such that the upper wall portion 321 is in contact with the liquid injection portion surface 312 of the liquid injection portion 310 and the upper wall portion 321 is joined to the liquid injection portion surface 312.

  In the above embodiment, the corner 315 between the liquid injection surface 312 and the side surface 313 has a larger taper than the corner 314 between the liquid injection surface 312 and the inner surface 311 a of the liquid injection port 311. Part or rounded part is formed. However, the corner portion 315 and the corner portion 314 may be formed with tapered portions or rounded portions having the same size. Alternatively, either one or both of the corner portion 315 and the corner portion 314 may be formed with neither a tapered portion nor a rounded portion. Note that neither the tapered portion nor the rounded portion is formed in the corner portion 314. When the tapered portion or the rounded portion is formed in the corner portion 315, the tapered portion larger than the corner portion 314 is formed in the corner portion 315. Or it can be said that the rounded portion is formed.

  In addition, embodiments constructed by arbitrarily combining the constituent elements included in the above-described embodiment and its modifications are also included in the scope of the present invention.

  Further, the present invention can be realized not only as the electricity storage element 10 but also as the liquid injection equipment 300 (the liquid injection part 310 and the liquid injection stopper 320) provided in the electric power storage element 10.

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

DESCRIPTION OF SYMBOLS 10 Power storage element 100 Container 110 Cover body 111 Gas exhaust valve 112, 510 Through-hole 113 Surface 120 Container main body 200 Electrode terminal 210 Shaft part 300 Injection facility 310 Injection part 311 Injection port 311a Inner surface 312 Injection part surface 313 Side surface 314 315 Corner part 320 Injection stopper 321 Upper wall part 322 Side wall part 323 Bottom wall part 323a Outer edge 330 Joint part 400 Electrode body 500 Current collector

Claims (5)

A power storage device comprising a container,
A liquid injection part provided protruding from the surface of the container, and formed with a liquid injection port;
A liquid stopper that covers the liquid injection port in a state of being separated from the inner surface of the liquid injection port,
The liquid injection plug is disposed in contact with a side surface of the liquid injection part. The power storage device according to claim 1, wherein the liquid injection stopper is disposed in contact with a plurality of locations on a side surface of the liquid injection portion. The electric storage element according to claim 1, wherein the liquid injection stopper is disposed to be fitted to the liquid injection part. The injection stopper is
A side wall portion disposed along a side surface of the liquid injection portion;
A bottom wall extending outwardly along the surface of the container from the side wall,
The power storage device according to claim 1, wherein the bottom wall portion is bonded to a surface of the container. The liquid injection part further includes an inner surface of the liquid injection port, and a liquid injection part surface connecting the inner surface and the side surface,
The taper part or round part larger than the corner | angular part between the said liquid injection part surface and the said inner surface is formed in the corner | angular part between the said liquid injection part surface and the said side surface. The electrical storage element of any one of Claims.

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