JP2017084540A - Power storage element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage element simplifying a structure for suppressing an electrode body from closing a safety valve while reducing the size thereof.SOLUTION: In a power storage element 100 including a positive electrode terminal 30, a negative electrode terminal 40 and a case 10, the case 10 includes: a safety valve 50 provided at a lid 12 constituting a wall of the case 10; a first recessed portion 13a and a second recessed portion 14a formed to be caved in toward the outside of the case 10 at a position where the positive electrode terminal 30 and the negative electrode terminal 40 in the lid 12 are disposed; and a projecting portion 80 located on the side of the safety valve 50 and projecting from the lid 12 toward the inside of the case 10.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a power storage element including a safety valve in a container.

  A power storage element such as a lithium ion secondary battery includes an electrode body having positive and negative electrodes alternately stacked, a container that houses the electrode body, and an electrode terminal that is provided in the container and connected to the electrode body. There is something. Since an electrolyte such as an electrolytic solution is also enclosed in the container, the container has a sealed structure. In order to relieve pressure when the internal pressure of the sealed container rises, a safety valve may be provided in the container.

  For example, Patent Document 1 describes a secondary battery having a pressure release valve as a safety valve on a lid of a container. The pressure release valve has a groove formed so as to be opened when a pressure of a predetermined value or more is applied. In the container, a positive electrode and a negative electrode are wound through a separator, and an electrode body formed into a flat shape is accommodated. The accommodated electrode body is arranged with the winding axis oriented along the lid. One of both ends of the electrode body in the winding axis direction functions as a positive electrode current collecting tab, and the other functions as a negative electrode current collecting tab. A positive electrode terminal provided on the lid is electrically connected to a positive electrode current collecting tab of the electrode body by a positive electrode lead. A negative electrode terminal provided on the lid is electrically connected to a negative electrode current collecting tab of the electrode body by a negative electrode lead. Furthermore, a plate-like insulator made of a resin material is provided between the lid and the electrode body.

  The insulator has a plate-like main body extending along the lid from the positive electrode lead to the negative electrode lead so as to cover the pressure release valve. Further, the insulator has a plurality of spaced-apart portions extending from the main body to the lid body and having the shape of columnar protrusions along the edge of the main body. The main body is separated from the lid by the separation portion.

JP 2013-25882 A

  An electrolyte is sealed in a secondary battery container described in Patent Document 1, and the electrolyte generates gas when decomposed when an abnormality such as overcharge, impact, or puncture occurs in the secondary battery. Sometimes. When the internal pressure of the container rises and reaches a predetermined value due to the generated gas, the pressure release valve opens to release the gas. At this time, the pressure difference between the inside and the outside of the container causes the electrode body in the container to move to the pressure release valve, but the insulator prevents the electrode body from directly contacting and closing the pressure release valve.

  Since the insulator extending from the positive electrode lead to the negative electrode lead as described above has a large size, there arises a problem of an increase in cost. Furthermore, since the process of attaching the insulator to the lid also occurs, the cost increases.

  Further, in the secondary battery described in Patent Document 1, a positive electrode terminal and a negative electrode terminal having conductivity are attached to the outer surface of a flat lid formed of a metal material, and the inner surface of the lid is made conductive. A positive electrode lead and a negative electrode lead are attached. Generally, an insulating member having electrical insulation is provided between the positive terminal and the negative terminal and the lid, and between the lid and the positive lead and the negative lead. As a result, the connecting portion between the positive electrode lead and the negative electrode lead and the lid body protrudes from the lid body toward the inside of the container with a relatively large projecting amount. Therefore, the electrode body attached to the positive electrode lead and the negative electrode lead is It will be in a state greatly separated from the body. Therefore, the problem that a secondary battery enlarges arises.

  The present invention has been made in order to solve the above-described problems, and an electric storage element that simplifies the structure for suppressing the electrode body from blocking the safety release valve, that is, the safety valve, while reducing the size. The purpose is to provide.

  In order to achieve the above object, a power storage device according to the present invention is a power storage device including an electrode terminal and a container, and the container includes a safety valve provided on a wall portion of the container and an electrode terminal on the wall portion. And a convex portion that is located on the side of the safety valve and protrudes from the wall portion toward the inner side of the container.

  In the above-described configuration, since the concave portion is formed at the position where the electrode terminal is disposed in the wall portion of the container, the connection portion between the electrode terminal and the electrode body can be disposed in the concave portion. It is possible to place the electrode body close to the portion, and it is possible to efficiently secure the accommodation area of the electrode body. In this case, if the electrode body moves toward the wall when the safety valve is opened due to an increase in pressure in the container, the electrode body located close to the wall and the safety valve may directly block the safety valve. However, the side convex portion of the safety valve can secure a gap between the electrode body and the wall portion. Therefore, the safety valve can stably release the increased pressure without being blocked by the electrode body. Therefore, it is possible to reduce the size of the storage element and simplify the structure for suppressing the electrode body from blocking the safety valve.

  The convex part may be constituted by at least one protrusion formed integrally with the wall part. In the above-described configuration, it is easy to form the convex portion and fix the position of the convex portion.

  The convex part may be constituted by at least one block-like member attached to the wall part. In the above-described configuration, the arrangement form, shape, and strength of the convex portions can be arbitrarily set and changed.

  A plurality of convex portions may be provided at intervals. In the above-described configuration, even when the plurality of convex portions are provided so as to surround the safety valve, a passage leading to the safety valve can be secured between them.

  The convex portion may include a through hole that penetrates the convex portion in a direction along the wall portion. In the above-described configuration, even when the electrode body is in contact with the convex portion and closes the gap between the convex portions, it is possible to secure a passage leading to the safety valve through the through hole of the convex portion.

  The power storage element may further include a current collector connected to the electrode terminal, and a part of the current collector may be located in the recess. In the above-described configuration, since the amount of protrusion of the current collector from the wall portion of the container can be reduced, the electrode body connected to the current collector can be disposed close to the wall portion and the convex portion. Therefore, the container can be downsized.

  An electrical storage element according to the present invention is an electrical storage element including an electrode body, an electrode terminal, a current collector that electrically connects the electrode body and the electrode terminal, and a container, wherein the container is disposed on a wall portion of the container. A safety valve that is provided; a convex portion that is located on the side of the safety valve and protrudes from the wall portion toward the inside of the container; and the connection portion between the electrode terminal and the current collector is located on the outer surface side of the wall portion To do.

  In the above-described configuration, the electrode body can be disposed close to the wall portion because the connection portion between the electrode terminal and the current collector is located on the outer surface side of the wall portion of the container. Can be secured efficiently. In addition, even when the electrode body moves toward the wall when the safety valve is opened due to an increase in pressure in the container, the side protrusion of the safety valve secures a gap between the electrode body and the wall, The safety valve is prevented from being blocked by the electrode body.

  According to the electricity storage device of the present invention, it is possible to simplify the structure for suppressing the electrode body from blocking the safety valve while reducing the size.

It is a perspective view which shows typically the external appearance of the electrical storage element which concerns on embodiment of this invention. FIG. 2 is a perspective view in which a lid body is separated from a container body in the electricity storage device of FIG. 1. FIG. 3 is a perspective view in which a part of the electrode body of FIG. 2 is developed. It is a disassembled perspective view of the electrical storage element except the container main body from FIG. FIG. 3 is a cross-sectional side view of the electricity storage device of FIG. It is the top view which looked at the inner surface of the cover body of FIG. 5 from the cross section along the VI-VI line. It is a front view of the electrical storage element except the container main body from FIG. It is a front view which shows the structure of the modification 1 of the electrical storage element which concerns on embodiment of this invention similarly to FIG. It is a top view which shows the inner surface of the cover body of FIG. 8 similarly to FIG. It is a cross-sectional side view which shows the structure of the modification 2 of the electrical storage element which concerns on embodiment of this invention similarly to FIG. It is a perspective view of the positive electrode collector of the electrical storage element of FIG.

  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 each of the embodiments described below shows a comprehensive or specific example. Numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of constituent elements, 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.

[Embodiment]
The structure of the electrical storage element 100 which concerns on embodiment is demonstrated. FIG. 1 is a perspective view schematically showing an external appearance of a power storage device 100 according to the embodiment. As shown in FIG. 1, the power storage element 100 has a flat rectangular parallelepiped outer shape. The power storage element 100 is a secondary battery capable of charging and discharging electricity. For example, the storage element 100 is specifically a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. However, the storage element 100 is not limited to a non-aqueous electrolyte secondary battery, and may be a secondary battery other than the non-aqueous electrolyte secondary battery or a capacitor.

  Referring to FIGS. 1 and 2 together, the storage element 100 includes a flat rectangular parallelepiped container 10, an electrode body 20 included in the container 10, a positive electrode terminal 30, and a negative electrode terminal 40. . The container 10 has a bottomed rectangular tube-shaped container main body 11 and an elongated rectangular plate-like lid body 12 that can close the opening 11a of the container main body 11. 2 is a perspective view in which the lid 12 is separated from the container main body 11 in the electricity storage device 100 of FIG. The container body 11 has a flat rectangular parallelepiped outer shape. The shape of the opening 11a is an elongated rectangular shape. On the outer surface 12 a of the lid body 12, the positive terminal 30 and the negative terminal 40 are disposed. In the lid body 12, a safety valve 50 is formed between the positive electrode terminal 30 and the negative electrode terminal 40. The configuration of the safety valve 50 will be described later. Here, the positive electrode terminal 30 and the negative electrode terminal 40 are examples of electrode terminals, and the lid body 12 is an example of a wall portion of a container.

  The container main body 11 and the lid body 12 can be fixed with their joints in an airtight state by a joining method such as welding. Thereby, the container 10 forms the space sealed inside. The container body 11 and the lid body 12 can be made of a material that is not deformed and does not impair the airtightness of the joint when the internal pressure of the container 10 increases. Although it does not limit, the container main body 11 and the cover body 12 can be produced from weldable metals, such as stainless steel, aluminum, aluminum alloy, for example.

  Moreover, although liquid, such as electrolyte solution (this embodiment nonaqueous electrolyte solution), is enclosed as an electrolyte inside the container 10, illustration of the said liquid is abbreviate | omitted. As the electrolytic solution sealed in the container 10, there is no particular limitation on the type thereof as long as it does not impair the performance of the electricity storage device 100, and various types can be selected.

  The positive electrode terminal 30 and the negative electrode terminal 40 are respectively connected to the positive electrode current collector 60 and the negative electrode current collector 70 on the side opposite to the outer surface 12 a of the lid body 12. The positive electrode current collector 60 and the negative electrode current collector 70 are further connected to the electrode body 20. Therefore, the electrode body 20 is provided so as to be suspended from the lid body 12 via the positive electrode current collector 60 and the negative electrode current collector 70. The electrode body 20 is housed in the container body 11 together with the positive electrode current collector 60 and the negative electrode current collector 70. In addition, in order to electrically insulate between the electrode body 20 and the container main body 11, the electrode body 20 may be covered with an insulating film etc. A buffer material such as a spacer may be provided between the electrode body 20 and the container body 11.

  The electrode body 20 is a power generation element that can store electricity. And the electrode body 20 was formed by winding the strip | belt-shaped positive electrode 21 and the strip | belt-shaped negative electrode 22 which are shown in FIG. 3 around the winding axis A through the strip | belt-shaped separator 23 in multiple turns. It has a flat outer shape. The winding axis A is a virtual axis indicated by a one-dot chain line in FIG. 2, and the electrode body 20 is substantially symmetric with respect to the winding axis A. The winding axis A extends along the longitudinal direction of the lid body 12. The electrode body 20 is disposed in a direction in which the outer peripheral portion formed along the winding direction is opposed to the lid body 12. The electrode body 20 having the arrangement configuration as described above is called a vertically wound electrode body.

  Here, in the following description and drawings, the winding axis A direction of the electrode body 20 of the energy storage device 100 is referred to as the X-axis direction. Accordingly, as shown in FIGS. 1 and 2, the positive electrode current collector 60 and the negative electrode current collector 70 are arranged along the X-axis direction, and the positive electrode terminal 30 and the negative electrode terminal 40 are arranged along the X-axis direction. It is out. And the elongate rectangular short side surface which opposes in the container main body 11 is located in a line along the X-axis direction.

  Furthermore, the up-down direction of the energy storage device 100 along the direction from the container body 11 toward the lid 12 and perpendicular to the X-axis is referred to as a Z-axis direction. Therefore, the positive electrode current collector 60 and the negative electrode current collector 70 protrude from the lid body 12 along the Z-axis direction and extend along the Z-axis direction. And the long side of the elongate short side surface of the container main body 11 extends along the Z-axis direction. Note that, depending on the usage mode, the storage element 100 may not be arranged with the Z-axis direction as the vertical direction, and thus the Z-axis direction is not necessarily limited to the vertical direction.

  A direction perpendicular to the X-axis direction and the Z-axis direction is referred to as a Y-axis direction. Therefore, the wide long side which the container main body 11 opposes is located in a line along the Y-axis direction, and the short side of the short side surface of the container main body 11 extends along the Y-axis direction. Furthermore, the Y-axis direction can be defined as the thickness direction of the container 10.

  With reference to FIG. 3, the detailed structure of the electrode body 20 is demonstrated. FIG. 3 is a perspective view showing a developed part of the electrode body 20 of FIG.

  The electrode body 20 is formed by laminating a positive electrode 21 in the shape of a long belt-like sheet, a negative electrode 22 in the shape of a long belt-like sheet, and a separator 23 in the shape of a long belt-like sheet. Contains. The electrode body 20 is formed by winding the positive electrode 21, the negative electrode 22, and the separator 23, which are layered, in a spiral shape in the winding direction B around the winding axis A. In this embodiment, the positive electrode 21, the negative electrode 22, and the separator 23 that have started to be wound are rotated around the winding axis A in the winding direction B, so that the unwound belt-like positive electrode 21, negative electrode 22 and the separator 23 shall be wound. That is, the winding direction B indicated by the clockwise direction in FIG. 3 is the rotation direction of the electrode body 20 during winding.

  The positive electrode 21 is formed by laminating a positive electrode active material layer on a positive electrode base material layer, which is a long metal foil made of metal such as aluminum or aluminum alloy, by a method such as coating. The negative electrode 22 is formed by laminating a negative electrode active material layer on a negative electrode base material layer, which is a long strip-shaped metal foil made of metal such as copper or copper alloy, by a method such as coating. The separator 23 is a microporous sheet made of a material having electrical insulation properties such as a resin.

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

  The positive electrode active material layer is not laminated in the band-like region in the vicinity of one edge 21a of the two edges 21a and 21b along the longitudinal direction of the positive electrode 21. The edge of the positive electrode 21 that forms the band-like region is referred to as a positive electrode uncoated portion 21c. In the positive electrode uncoated portion 21c, the positive electrode base material layer is exposed. That is, the positive electrode uncoated portion 21c is configured to be connected to the positive electrode current collector 60, and forms a current collection region.

  Furthermore, the negative electrode active material layer is not laminated also in the band-like region in the vicinity of one edge 22b of the two edges 22a and 22b along the longitudinal direction of the negative electrode 22. The edge part of the negative electrode 22 forming the band-like region is referred to as a negative electrode uncoated part 22c. In the negative electrode uncoated portion 22c, the negative electrode base material layer is exposed. That is, the negative electrode uncoated portion 22c is configured to be connected to the negative electrode current collector 70, and forms a current collection region.

  When the positive electrode 21 and the negative electrode 22 are overlapped for winding, the positive electrode uncoated portion 21c and the negative electrode uncoated portion 22c are opposite to each other across the overlapping portion of the positive electrode 21 and the negative electrode 22. To position. Furthermore, the positive electrode uncoated portion 21 c protrudes from the edge 22 a of the negative electrode 22, and the negative electrode uncoated portion 22 c protrudes from the edge 21 b of the positive electrode 21. The positive electrode 21 and the negative electrode 22 are overlapped so that the edge 21a and the edge 22a are located on the same side with respect to the longitudinal direction, and the edge 21b and the edge 22b are located on the same side with respect to the longitudinal direction. .

  The separator 23 has a width in the winding axis A direction so as to cover the entire negative electrode 22 except the negative electrode uncoated portion 22c. Two separators 23 are provided on flat main surfaces on both sides of one negative electrode 22. The negative electrode uncoated portion 22 c protrudes from the separator 23 through the two separators 23. Furthermore, one positive electrode 21 is provided on the separator 23 so as to be positioned further inside the separator 23 adjacent to the negative electrode 22 on the inner side during winding. The positive electrode 21 is formed with a width in the winding axis A direction such that the entire positive electrode 21 except the positive electrode uncoated portion 21 c is covered with the negative electrode 22 and the separator 23. The positive electrode 21 stacked on the separator 23 faces the negative electrode 22 as a whole except for the positive electrode uncoated portion 21c. The positive electrode uncoated portion 21 c protrudes from the separator 23.

  One positive electrode 21, one negative electrode 22, and two separators 23 laminated as described above are wound together in a spiral shape in the winding direction B around the winding axis A, thereby A body 20 is formed. In the present embodiment, the electrode body 20 is formed to have an oval cross-sectional shape that is flat in the YZ plane direction. However, the cross-sectional shape of the electrode body 20 may be other than an oval shape, and may be a circle, an ellipse, a rectangle, or other polygons.

  Please refer to FIG. 2 and FIGS. FIG. 4 is an exploded perspective view of the electricity storage device 100 excluding the container body 11 from FIG. FIG. 5 is a cross-sectional side view of the power storage device 100 of FIG. 1, and is a view of a cross section perpendicular to the lid body 12 passing through the centers of the positive electrode terminal 30 and the negative electrode terminal 40 as viewed from the direction V. In FIG. 5, the electrode body 20 is depicted in a side view. FIG. 6 is a plan view of the inner surface 12b of the lid body 12 of FIG. 5 as seen from a cross section taken along the line VI-VI. FIG. 7 is a front view of the electricity storage device 100 excluding the container body 11 from FIG.

  As shown in FIGS. 2 and 4, the positive electrode terminal 30 includes a terminal body 31, an upper insulating member 32, and a lower insulating member 33. The negative electrode terminal 40 includes a terminal body 41, an upper insulating member 42, and a lower insulating member 43. The terminal bodies 31 and 41 are made of a conductive material such as metal. Cylindrical rivet portions 31a and 41a are formed so as to protrude from the flat terminal bodies 31 and 41, respectively. The upper insulating members 32 and 42 and the lower insulating members 33 and 43 are plate-like packings made from a material having electrical insulation properties such as resin.

  As shown in FIGS. 4 to 6, the first attachment portion 13 and the second attachment portion 14 are integrally formed on the lid body 12 with an interval in the longitudinal direction. The first attachment portion 13 and the second attachment portion 14 protrude from the outer surface 12a of the lid body 12 and form a trapezoidal trapezoidal outer shape. The first attachment portion 13 and the second attachment portion 14 are respectively formed with first recesses 13a and second recesses 14a that are recessed from the inner surface 12b of the lid body 12 toward the outer surface 12a and that are open on the inner surface 12b side. doing. The first recess 13a and the second recess 14a have a trapezoidal trapezoidal shape. Through holes 13c and 14c are formed in the bottom walls 13b and 14b that form flat mounting surfaces in the first mounting portion 13 and the second mounting portion 14, respectively. The rivet part 31a of the terminal body 31 can pass through the through hole 13c, and the rivet part 41a of the terminal body 41 can pass through the through hole 14c. Here, the 1st recessed part 13a and the 2nd recessed part 14a are examples of the recessed part of the wall part of a container.

  In the lid body 12, a safety valve 50 is provided at an intermediate position between the first attachment portion 13 and the second attachment portion 14. The safety valve 50 is formed integrally with the lid body 12. The safety valve 50 includes a weakened portion 51 formed by reducing the thickness of a part of the lid 12 and a groove portion 52 formed so as to cut into the weakened portion 51. In the present embodiment, the weakening portion 51 has an elliptical planar shape. The groove portion 52 has a shape in which two differently oriented grooves are connected to the ends of one groove, that is, a planar shape in which two Y-shaped portions are connected. Thereby, the weakening part 51 becomes easy to fracture | rupture at the cross | intersection part of a groove | channel. Therefore, when a predetermined pressure is applied to the safety valve 50, the weakened portion 51 is broken in the groove 52, and the member of the weakened portion 51 around the groove 52 is opened to form an opening as a pressure relief hole. The pressure at which the safety valve 50 opens can be controlled by the shape of the weakened portion in the weakened portion 51, the member thickness of the weakened portion, the shape of the groove, the depth of the groove, and the like.

  Through holes 32a and 42a through which the rivet portions 31a and 41a can respectively pass are formed in the upper insulating members 32 and 42, respectively. The upper insulating member 32 is configured such that the terminal body 31 of the positive electrode terminal 30 is fitted inside on one side, and the first mounting portion 13 protruding from the lid body 12 is fitted inside on the other side. . The upper insulating member 42 is configured such that the terminal body 41 of the negative electrode terminal 40 is fitted inside on one side, and the second mounting portion 14 protruding from the lid body 12 is fitted inside on the other side.

  The lower insulating members 33 and 43 are formed with through holes 33a and 43a through which the rivet portions 31a and 41a can pass, respectively. The lower insulating member 33 is formed so as to fit within the first recess 13 a of the first attachment portion 13. The lower insulating member 43 is formed so as to fit within the second recess 14 a of the second mounting portion 14.

  The positive electrode current collector 60 is configured to be connected to the terminal body 31 of the positive electrode terminal 30 and the positive electrode uncoated portion 21 c of the electrode body 20. The positive electrode current collector 60 is a member having conductivity and rigidity. The positive electrode current collector 60 is made of a metal such as aluminum or an aluminum alloy, like the positive electrode base material layer of the electrode body 20.

  The positive electrode current collector 60 includes a plate-like fixing portion 61 attached to the flat bottom wall 13 b of the first attachment portion 13 of the lid body 12, and two elongated shapes formed integrally with the fixing portion 61 and extending from the fixing portion 61. Plate-like leg portion 62. The two legs 62 are assembled so as to be sandwiched from both sides of the positive electrode uncoated portion 21c focused in the stacking direction, and are joined to the positive electrode uncoated portion 21c by welding such as ultrasonic welding or resistance welding. The fixing portion 61 is formed with a through hole 61a through which the rivet portion 31a can pass. The fixing portion 61 is formed in a shape that fits into the first recess 13 a of the first attachment portion 13 together with the lower insulating member 33.

  The rivet portion 31 a of the terminal body 31 is sequentially formed in a through hole 32 a of the upper insulating member 32, a through hole 13 c of the lid body 12, a through hole 33 a of the lower insulating member 33, and a through hole 61 a of the positive electrode current collector 60. After being passed, it is caulked. And the front-end | tip of the rivet part 31a which protrudes from the fixing | fixed part 61 of the positive electrode electrical power collector 60 is expanded to radial direction outer side, and forms the crimping end part 31aa. Thus, the terminal body 31 of the positive terminal 30 and the fixing portion 61 of the positive current collector 60 are interposed between the upper insulating member 32 and the lower insulating member 33 with respect to the flat bottom wall 13b of the first mounting portion 13. Installed and fixed with interposition. At this time, the terminal body 31 is physically and electrically connected to the positive electrode current collector 60. The upper insulating member 32 electrically insulates the terminal body 31 and the lid body 12. The lower insulating member 33 electrically insulates the lid 12 and the positive electrode current collector 60 from each other. Almost all of the fixing portion 61 is accommodated in the first recess 13 a of the first mounting portion 13.

  The negative electrode current collector 70 is configured to be connected to the terminal body 41 of the negative electrode terminal 40 and the negative electrode uncoated portion 22 c of the electrode body 20. The negative electrode current collector 70 is a member having conductivity and rigidity. The negative electrode current collector 70 is made of a metal such as copper or a copper alloy, similarly to the negative electrode base material layer of the electrode body 20.

  The negative electrode current collector 70 includes a plate-like fixing portion 71 attached to the flat bottom wall 14 b of the second attachment portion 14 of the lid 12, and two elongated shapes that are integrally formed with the fixing portion 71 and extend from the fixing portion 71. Plate-like legs 72. The two legs 72 are assembled so as to be sandwiched from both sides by the negative electrode uncoated portion 22c focused in the stacking direction, and are joined to the negative electrode uncoated portion 22c by welding such as ultrasonic welding and resistance welding. The fixing portion 71 is formed with a through hole 71a through which the rivet portion 41a of the terminal body 41 of the negative electrode terminal 40 can pass.

  The rivet portion 41 a of the terminal body 41 is sequentially formed in a through hole 42 a of the upper insulating member 42, a through hole 14 c of the lid body 12, a through hole 43 a of the lower insulating member 43, and a through hole 71 a of the negative electrode current collector 70. After being passed, it is caulked. And the front-end | tip of the rivet part 41a which protrudes from the fixing | fixed part 71 of the negative electrode collector 70 is expanded to radial direction outer side, and forms the crimping | crimp end part 41aa. Thereby, the terminal body 41 of the negative electrode terminal 40 and the fixing portion 71 of the negative electrode current collector 70 are interposed between the upper insulating member 42 and the lower insulating member 43 with respect to the flat bottom wall 14b of the second mounting portion 14. Installed and fixed with interposition. At this time, the terminal body 41 is physically and electrically connected to the negative electrode current collector 70. The upper insulating member 42 electrically insulates the terminal body 41 and the lid body 12. The lower insulating member 43 electrically insulates the lid body 12 and the negative electrode current collector 70 from each other. Almost all of the fixing portion 71 is accommodated in the second concave portion 14 a of the second mounting portion 14.

  The connection structure of the terminal main body 31 of the positive electrode terminal 30, the upper insulating member 32, the lid 12, the lower insulating member 33, and the fixing portion 61 of the positive electrode current collector 60 is not limited to riveting, but is an upper insulating material. Any structure may be used as long as the terminal body 31 and the fixing portion 61 are connected to each other with the member 32, the lid body 12, and the lower insulating member 33 interposed therebetween. Similarly, the connection structure of the terminal main body 41 of the negative electrode terminal 40, the upper insulating member 42, the lid body 12, the lower insulating member 43, and the fixing portion 71 of the negative electrode current collector 70 is not limited to riveting, Any structure that connects the terminal body 41 and the fixing portion 71 with the insulating member 42, the lid body 12, and the lower insulating member 43 interposed therebetween may be used. For example, a bolt and a nut may be used instead of the rivet portion 31a or 41a, and the rivet portion 31a or 41a may be welded to the fixing portion 61 or 71.

  Referring to FIG. 6, on the inner surface 12 b of the lid body 12, a plurality of convex portions 80 projecting from the inner surface 12 b toward the electrode body 20 are formed integrally with the lid body 12. The convex portion 80 is made of the same material as the lid body 12 and is formed continuously with the lid body 12. The convex part 80 as described above may be integrally formed at the time of casting the plate material constituting the lid body 12 or may be integrally molded by pressing the plate material constituting the lid body 12. The convex portion 80 may be solid or hollow.

  The convex portion 80 is formed on the side of the safety valve 50, that is, between the safety valve 50 and the first attachment portion 13 and between the safety valve 50 and the second attachment portion 14. Each convex part 80 has the external shape of the strip | belt-shaped protrusion curved in the arc shape. In the present embodiment, the four convex portions 80 are arranged in the vicinity of the safety valve 50 so as to surround the safety valve 50 while being spaced apart from each other.

  As a result, four passages 81, 82, 83, and 84 that separate adjacent convex portions 80 are formed on the inner surface 12 b of the lid body 12. The first passage 81 extends along the direction from the safety valve 50 toward the first attachment portion 13. The second passage 82 extends along the direction from the safety valve 50 toward the second attachment portion 14. The third passage 83 extends from the safety valve 50 along the direction intersecting the first passage 81 and the second passage 82. The fourth passage 84 extends from the safety valve 50 in the direction opposite to the third passage 83 and along the direction intersecting the first passage 81 and the second passage 82.

  Referring to FIG. 7, each protrusion 80 protrudes from the lid body 12 at a height close to the electrode body 20 fixed to the lid body 12 via the positive electrode current collector 60 and the negative electrode current collector 70. . The convex portion 80 can have a height that does not contact the electrode body 20 with a slight gap. However, when the convex portion 80 does not have conductivity, or when the electrode body 20 is covered with an electrical insulator, the convex portion 80 may have a height that contacts the electrode body 20. Good. Or even if the convex part 80 has electroconductivity, the convex part 80 may have a height which contacts the electrode body 20 via an electrical insulator. However, the convex portion 80 does not necessarily have a height close to the electrode body 20. The convex portion 80 includes the height of the caulking end portion 31aa of the rivet portion 31a protruding from the fixing portion 61 of the positive electrode current collector 60 and the caulking end portion 41aa of the rivet portion 41a protruding from the fixing portion 71 of the negative electrode current collector 70. It is desirable to have a protruding height that is at least higher than the height. That is, it is desirable that the protrusion 80 has a protrusion height that is at least higher than the maximum protrusion height of the fixing members of the fixing portions 61 and 71. Further, it is more desirable that the convex portion 80 has a height that is 3 mm or more.

  Referring again to FIG. 6, the position of the convex portion 80 with respect to the safety valve 50 on the inner surface 12 b of the lid body 12 is most preferably a position directly adjacent to the weakened portion 51 of the safety valve 50. However, the position of the convex portion 80 with respect to the safety valve 50 is not limited to the above position, and may be separated from the weakening portion 51. The position of the convex portion 80 with respect to the safety valve 50 is such that the protruding height of the convex portion 80 from the inner surface 12b, the extension length of the convex portion 80 on the inner surface 12b, and the deformation of the electrode body 20 with respect to deformation at the time of collision with the lid body 12. Based on the rigidity or the like, it can be set so that the electrode body 20 does not block the safety valve 50 when it collides with the convex portion 80 that may occur in the electrode body 20.

  Referring to FIGS. 5 and 6 together, in the electric storage element 100, for example, the internal pressure of the container 10 is increased due to the gas generated by the decomposition of the electrolyte due to the occurrence of abnormalities such as overcharge, impact, piercing, etc. 50 opens. In this case, the electrode body 20 may move toward the lid body 12 due to an abrupt airflow of gas flowing out from the safety valve 50. The moved electrode body 20 collides with the convex portion 80 before contacting the crimping end portions 31aa and 41aa of the rivet portions 31a and 41a and the lid body 12. Even when the electrode body 20 is deformed due to a collision with the convex portion 80, the electrode body 20 is maintained around the safety valve 50 by being separated from the inner surface 12 b of the lid body 12 by the convex portion 80. There is no blockage. Furthermore, even when the electrode body 20 contacts the convex portion 80 while covering the safety valve 50 and all the convex portions 80, the safety valve 50 is disposed around the convex portion 80 via the passages 81 to 84 extending in various directions. It communicates with a space between a certain container 10 and the electrode body 20. From the above, the safety valve 50 can release the gas in the container 10 to the outside.

  As described above, the energy storage device 100 according to the present embodiment includes the positive electrode terminal 30, the negative electrode terminal 40, and the container 10. The container 10 is formed to be recessed toward the outside of the container 10 at a position where the safety valve 50 provided on the lid 12 constituting the wall portion of the container 10 and the positive terminal 30 and the negative terminal 40 of the lid 12 are disposed. The first concave portion 13a and the second concave portion 14a are provided, and the convex portion 80 is located on the side of the safety valve 50 and protrudes from the lid 12 toward the inside of the container 10.

  In the above-described configuration, the first concave portion 13a and the second concave portion 14a are formed at positions where the positive electrode terminal 30 and the negative electrode terminal 40 are disposed in the lid body 12 of the container 10, whereby the positive electrode terminal 30, the negative electrode terminal 40, and the electrode are formed. The lower insulating members 33 and 43 constituting the connecting portion with the body 20, and the fixing portion 61 of the positive electrode current collector 60 and the fixing portion 71 of the negative electrode current collector 70 are placed in the first concave portion 13a and the second concave portion 14a. Can be arranged. For this reason, the electrode body 20 can be disposed close to the lid body 12, and the accommodation area of the electrode body 20 can be efficiently ensured. In this case, when the electrode body 20 moves toward the lid body 12 when the safety valve 50 is opened due to an increase in the pressure in the container 10, the electrode body 20 located close to the lid body 12 and the safety valve 50 causes the safety valve 50 to move. May be plugged directly. However, the side convex portion 80 of the safety valve 50 can secure a gap between the electrode body 20 and the lid body 12. Therefore, the safety valve 50 can stably release the increased pressure without being blocked by the electrode body 20. Therefore, it is possible to reduce the size of the storage element 100 and simplify the structure for suppressing the electrode body 20 from blocking the safety valve 50.

  In power storage element 100 according to the present embodiment, convex portion 80 is configured by at least one protrusion formed integrally with lid body 12. In the above-described configuration, it is easy to form the convex portion 80 and fix the position of the convex portion 80.

  In power storage device 100 according to the present embodiment, a plurality of convex portions 80 are provided at intervals. In the above-described configuration, even when the plurality of convex portions 80 are provided so as to surround the safety valve 50, the passages 81 to 84 that communicate with the safety valve 50 can be secured between each other.

  The power storage device 100 according to the present embodiment includes a positive electrode current collector 60 and a negative electrode current collector 70 connected to the positive electrode terminal 30 and the negative electrode terminal 40, and each of the positive electrode current collector 60 and the negative electrode current collector 70. Are located in the first recess 13a and the second recess 14a. In the above-described configuration, since the protruding amount of the positive electrode current collector 60 and the negative electrode current collector 70 from the lid body 12 of the container 10 can be reduced, the positive electrode current collector 60 and the negative electrode current collector 70 are connected. The electrode body 20 can be disposed close to the lid body 12 and the convex portion 80. Therefore, the container 10 can be downsized.

[Modification 1]
Moreover, the following structures are mentioned as the modification 1 of the electrical storage element 100 which concerns on embodiment. Specifically, as shown in FIG. 8, in the electricity storage device 200 according to Modification 1, the convex portion 80 formed on the lid body 12 of the container 10 has a convex portion through-hole 281. FIG. 8 is a front view showing the configuration of power storage element 200 according to Modification 1 of power storage element 100 according to the embodiment, as in FIG. Further, FIG. 9 is a plan view showing the inner surface 12b of the lid 12 of FIG. 8 in the same manner as FIG.

  Referring to FIGS. 8 and 9 together, each convex portion 80 of the lid body 12 is formed with a convex portion through-hole 281 extending along the inner surface 12 b of the lid body 12. The convex through hole 281 extends along the direction away from the safety valve 50 at a position away from the passages 81 to 84. Therefore, the convex part through-hole 281 communicates the space on the safety valve 50 side of the convex part 80 with the space on the opposite side to the safety valve 50 of the convex part 80.

  In the electricity storage device 200 having the above-described configuration, when the safety valve 50 is opened when the internal pressure of the container 10 is increased, the electrode body 20 that has collided with the convex portion 80 is deformed and the passages 81 to 84 between the convex portions 80 are deformed. Even when closed, the convex through-hole 281 communicates the safety valve 50 to the outside of the convex 80. Therefore, the safety valve 50 can release the gas in the container 10 to the outside. The other configuration of power storage element 200 according to Modification 1 is the same as the configuration of power storage element 100 according to the embodiment, and thus detailed description thereof is omitted.

  As described above, according to power storage element 200 according to Modification 1, the same effect as power storage element 100 according to the embodiment can be obtained. Furthermore, according to the electricity storage device 200 according to the first modification, the convex portion 80 includes the convex portion through-hole 281 that penetrates the convex portion 80 in the direction along the lid body 12. In the above-described configuration, even when the electrode body 20 is in contact with the convex portion 80 and closes the gap between the convex portions 80, the passage leading to the safety valve 50 via the convex portion through hole 281 of the convex portion 80 is ensured. It becomes possible. Therefore, the safety valve 50 is further blocked.

  In the electricity storage device 200 according to the first modification, the convex through holes 281 may not be formed in all the convex portions 80. Two or more convex through holes 281 may be formed in one convex portion 80.

[Modification 2]
Moreover, the following structures are mentioned as the modification 2 of the electrical storage element 100 which concerns on embodiment. As illustrated in FIG. 10, in the power storage element 300 according to Modification Example 2, the configurations of the positive electrode terminal and the negative electrode terminal are different from those of the power storage element 100 according to the embodiment. FIG. 10 is a cross-sectional side view showing the configuration of power storage element 300 according to Modification 2 of power storage element 100 according to the embodiment in the same manner as FIG. In addition, in FIG. 10, the electrode body 20 is drawn with the side view.

  A power storage device 300 according to Modification 2 includes a positive electrode terminal 330 and a negative electrode terminal 340 on the lid 12 of the container 10. Furthermore, the storage element 300 connects the positive electrode current collector 360 that connects the positive electrode terminal 330 and the positive electrode uncoated portion 21c of the electrode body 20, and the negative electrode terminal 340 and the negative electrode uncoated portion 22c of the electrode body 20 to each other. And a negative electrode current collector 370. The lid body 12 has a flat rectangular plate shape. The lid body 12 is formed with two through holes 12c and 12d from the outer surface 12a to the inner surface 12b. The positive terminal 330 is disposed in the through hole 12c, and the negative terminal 340 is disposed in the through hole 12d. The safety valve 50 is located between the through holes 12 c and 12 d in the lid body 12.

  Referring to FIG. 11, the positive electrode current collector 360 includes a rectangular plate-shaped fixing portion 361 and two leg portions 362 extending substantially parallel to each other from two corners of the fixing portion 361. FIG. 11 is a perspective view of the positive electrode current collector 360 of the power storage element 300 of FIG. Further, a cylindrical rivet portion 361 a protrudes from the surface of the fixing portion 361 opposite to the leg portion 362 in the direction opposite to the protruding direction of the leg portion 362. The rivet portion 361a is located in the vicinity of the two corner portions on the opposite side to the corner portion where the leg portion 362 is formed in the fixed portion 361. The fixed part 361, the rivet part 361a, and the leg part 362 are formed by integral molding. Positive electrode current collector 360 is made of a material similar to that of positive electrode current collector 60 of power storage element 100 according to the embodiment. The two leg parts 362 are joined to the positive electrode uncoated part 21 c of the electrode body 20 in the same manner as the leg part 62 of the positive electrode current collector 60.

  A negative electrode current collector 370 illustrated in FIG. 10 also has a configuration similar to that of the positive electrode current collector 360. Also in the negative electrode current collector 370, the fixing portion 371, the rivet portion 371a, and the leg portion 372 are formed by integral molding. Negative electrode current collector 370 is made of the same material as negative electrode current collector 70 of power storage device 100 according to the embodiment. The two leg portions 372 are joined to the negative electrode uncoated portion 22 c of the electrode body 20 in the same manner as the leg portion 72 of the negative electrode current collector 70.

  Referring to FIG. 10, the positive terminal 330 includes a rectangular plate-shaped terminal body 331, a rectangular plate-shaped upper insulating member 332, and a rectangular plate-shaped lower insulating member 333. The terminal main body 331, the upper insulating member 332, and the lower insulating member 333 are formed with through holes through which the rivet portion 361a of the positive electrode current collector 360 can pass. The terminal main body 331 is formed with a positive electrode protrusion 331 a for connecting a wiring from the outside of the power storage element 300.

  The negative electrode terminal 340 includes a rectangular plate-shaped terminal main body 341, a rectangular plate-shaped upper insulating member 342, and a rectangular plate-shaped lower insulating member 343. The terminal main body 341, the upper insulating member 342, and the lower insulating member 343 are formed with through holes through which the rivet portion 371a of the negative electrode current collector 370 can pass. The terminal body 341 is provided with a negative electrode protrusion 341 a for connecting a wiring from the outside of the power storage element 300.

  The rivet portion 361 a of the positive electrode current collector 360 includes a through hole of the lower insulating member 333, a through hole 12 c of the cover body 12, a through hole of the upper insulating member 332, and a terminal body 331 from the inner surface 12 b side of the lid body 12. After being sequentially passed through the through holes, the tip of the rivet portion 361a on the outer surface 12a side of the lid 12 is caulked. Thereby, the terminal body 331 of the positive electrode terminal 330 and the fixing portion 361 of the positive electrode current collector 360 are attached and fixed to the lid body 12 with the upper insulating member 332 and the lower insulating member 333 interposed therebetween. The At this time, the terminal body 331 is physically and electrically connected to the positive electrode current collector 360. The positive electrode protrusion 331a protrudes from the terminal body 331. The upper insulating member 332 electrically insulates the terminal body 331 and the lid body 12. Further, the cylindrical portion 332a of the upper insulating member 332 extends around the rivet portion 361a inside the through hole 12c, and electrically insulates the lid 12 and the rivet portion 361a. The lower insulating member 333 electrically insulates the lid 12 and the fixing part 361 of the positive electrode current collector 360.

  Similarly, the rivet portion 371a of the negative electrode current collector 370 also has a through hole in the lower insulating member 343, a through hole 12d in the lid body 12, and a through hole in the upper insulating member 342 from the inner surface 12b side of the lid body 12. After sequentially passing through the through holes of the terminal body 341, it is caulked. Thereby, the terminal body 341 of the negative electrode terminal 340 and the fixing portion 371 of the negative electrode current collector 370 are attached and fixed to the lid body 12 with the upper insulating member 342 and the lower insulating member 343 interposed therebetween. The At this time, the terminal body 341 is physically and electrically connected to the negative electrode current collector 370. A negative electrode protrusion 341 a protrudes from the terminal body 341. The upper insulating member 342 electrically insulates the terminal body 341 and the lid body 12, and the cylindrical portion 342 a of the upper insulating member 342 electrically insulates the lid body 12 and the rivet portion 371 a. The lower insulating member 343 electrically insulates the lid 12 and the fixing portion 371 of the negative electrode current collector 370.

  In the power storage device 300 as described above, a caulking end that is a connecting portion between the terminal main body 331 of the positive electrode terminal 330 and the positive electrode current collector 360, that is, a leading end portion that is caulked and widened in the rivet portion 361a of the positive electrode current collector 360. The portion 361aa is on the outer surface 12a side of the lid body 12 and protrudes from the terminal body 331 to the outer surface 12a side. Similarly, a connecting portion between the terminal main body 341 of the negative electrode terminal 340 and the negative electrode current collector 370, that is, a caulking end portion 371 aa that is a caulked end portion of the rivet portion 371 a of the negative electrode current collector 370 is a lid body. 12 on the outer surface 12a side, and protrudes from the terminal body 341 toward the outer surface 12a side. Here, the crimping end portions 361aa and 371aa are an example of a connection portion between the electrode terminal and the current collector.

  Further, on the inner surface 12 b of the lid body 12, except for the leg portions 362 and 372, the laminated lower insulating member 333 and the fixed portion 361 of the positive electrode current collector 360, the laminated lower insulating member 343 and the negative electrode current collector are stacked. The fixing part 371 of the body 370 only protrudes. And the laminated body by the lower insulating member 333 and the fixing | fixed part 361 and the laminated body by the lower insulating member 343 and the fixing | fixed part 371 have only the protrusion height which accumulated two plate-shaped bodies. Therefore, the electrode body 20 can be joined to the current collectors 360 and 370 while being close to the lid body 12.

  A plurality of convex portions 80 configured in the same manner as the power storage device 100 according to the embodiment are integrally formed around the safety valve 50 on the inner surface 12 b of the lid 12. The convex portion 80 protrudes from the inner surface 12b higher than the laminated body including the lower insulating member 333 and the fixing portion 361, and protrudes from the inner surface 12b higher than the laminated body including the lower insulating member 343 and the fixing portion 371. The convex portion 80 may have a height that contacts the electrode body 20 or may have a height that does not contact the electrode body 20.

  In addition, the other configuration of power storage element 300 according to Modification 2 is the same as the configuration of power storage element 100 according to the embodiment, and thus detailed description thereof is omitted. And according to the electrical storage element 300 which concerns on the modification 2, the effect similar to the electrical storage element 100 which concerns on embodiment is acquired. Further, according to the electricity storage device 300 according to the modified example 2, the connection portion between the positive electrode terminal 330 and the negative electrode terminal 340 and the positive electrode current collector 360 and the negative electrode current collector 370, that is, the rivet portion 361a of the positive electrode current collector 360 is caulked. The end portion 361aa and the caulking end portion 371aa of the rivet portion 371a of the negative electrode current collector 370 are located on the outer surface 12a side of the lid body 12. With the above-described configuration, the electrode body 20 can be disposed close to the lid body 12, and the accommodation area of the electrode body 20 can be efficiently secured. Note that the configurations of the positive electrode terminal 330 and the negative electrode terminal 340 of the energy storage device 300 according to the second modification can be applied to the first modification.

[Modification 3]
Moreover, the following structures are mentioned as the modification 3 of the electrical storage element 100 which concerns on embodiment. In the electricity storage device according to Modification 3, the convex portion 80 formed on the lid 12 of the container 10 is configured separately from the lid 12. The convex part 80 can be comprised from a solid or hollow strip-shaped block. As for the block which constitutes convex part 80, it is desirable to form from the material which has electrical insulation. Thereby, the electrical insulation member between the convex part 80 and the electrode body 20 becomes unnecessary. The block constituting the convex portion 80 can be attached to the lid body 12 by a method such as welding, welding, fastening using a fastening member, and adhesion using a double-sided tape or an adhesive. Or the block which comprises the convex part 80 may be attached to the cover body 12 by fitting in the fitting hole formed in the cover body 12. FIG. In addition, since the other structure of the electrical storage element which concerns on the modification 3 is the same as that of the electrical storage element 100 which concerns on embodiment, detailed description is abbreviate | omitted.

  As described above, according to the electricity storage device according to the third modification, the same effect as the electricity storage device 100 according to the embodiment can be obtained. Furthermore, according to the electricity storage device according to Modification 3, the convex portion 80 is configured by at least one block-shaped member attached to the lid body 12. With the above-described configuration, the material forming the convex portion 80 can be an arbitrary material different from the lid 12 such as a material having electrical insulation. Moreover, the convex part 80 can be provided in arbitrary shape, a dimension, and arrangement | positioning after preparation of the cover body 12. FIG. That is, the arrangement form, shape, and strength of the protrusions 80 can be arbitrarily set and changed.

  Note that the configuration of the convex portion 80 of the electricity storage device according to Modification 3 can also be applied to Modification 1 and Modification 2. Further, in the electricity storage device according to Modification Example 3 and the electricity storage device according to Modification Examples 1 and 2, a part of the plurality of convex portions 80 is integrally formed with the lid body 12, and The other part may be a separate body from the lid 12.

[Other variations]
The power storage device according to the embodiment and the modification of the present invention has been described above, but the present invention is not limited to the embodiment and the modification. That is, it should be considered that the embodiment and the modification disclosed this time are examples in all respects and are 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.

  In the electricity storage device according to the embodiment and the modification, the plurality of convex portions 80 are arranged in a single circumferential shape surrounding the safety valve 50 in the lid 12 of the container 10, but the present invention is not limited to this. The convex part 80 may be arrange | positioned in the shape of two or more multiple circumferences surrounding the safety valve 50.

  In the electricity storage device according to the embodiment and the modified example, in the lid 12 of the container 10, the four convex portions 80 are arranged at intervals from each other so as to surround the safety valve 50, but are not limited thereto. Not. Three or less or five or more convex portions 80 may be arranged in a single circumferential shape so as to surround the safety valve 50. Furthermore, the arrangement form of the convex portions 80 may not surround the safety valve 50 such as a parallel arrangement form. Even when the four convex portions 80 are provided in the lid body 12, the arrangement of the passages formed by the convex portions 80 is not limited to the arrangement of the embodiment. Further, the four convex portions 80 may be continuous.

  In the electricity storage device according to the embodiment and the modification, the convex portion 80 has a curved linear planar shape on the lid body 12 of the container 10. However, the linear shape, circular shape, elliptical shape, You may have planar shapes, such as a square.

  In the electricity storage device according to the embodiment and the modification, on the lid body 12 of the container 10, the four convex portions 80 have the same shape, but may have different shapes. Further, the protruding amount of the four convex portions 80 from the lid body 12, that is, the height of the convex portion 80 may not be the same. For example, when the distance between the convex parts 80 that straddle the safety valve differs between the pairs of convex parts 80 that are opposed to each other with the safety valve 50 interposed therebetween, the height of the group of convex parts 80 that has a large distance between the convex parts 80 is increased. May be. Thereby, even if the electrode body 20 is deformed so as to bend toward the safety valve 50 at the time of collision with the convex portion 80, the electrode body 20 can be prevented from closing the safety valve 50.

  In the energy storage device according to the embodiment and the modification, each of the positive electrode current collector and the negative electrode current collector has a plate-like fixing portion and two leg portions extending from the fixing portion. However, the configuration of the fixed portion and the leg portion is not limited to the configuration in the embodiment and the modification. For example, in the positive electrode current collector and the negative electrode current collector of the energy storage device according to the embodiment, the portions fixed to the lid body 12 are in the first recess 13 a of the first mounting portion 13 and the second of the second mounting portion 14. Any configuration that fits in the recess 14a is acceptable.

  The power storage element according to the embodiment and the modification includes one electrode body 20. However, the power storage element may include two or more electrode bodies.

  In the electricity storage device according to the embodiment and the modification, the electrode body 20 is configured to be connected to the positive electrode current collector and the negative electrode current collector at the positive electrode uncoated portion 21c and the negative electrode uncoated portion 22c, respectively. However, it is not limited to this. The electrode body may be configured to integrally have tabs protruding from the positive electrode and the negative electrode at the position of the positive electrode uncoated portion 21c and the position of the negative electrode uncoated portion 22c, respectively. Furthermore, the positive electrode current collector and the negative electrode current collector may be connected to the tab.

  The power storage element according to the embodiment and the modification is a power storage element including the vertically wound electrode body 20, but the end of the electrode body 20 in the winding axis A direction is opposed to the lid body 12 of the container 10. An electric storage element including a horizontally wound electrode body in which the electrode body 20 is arranged in a direction may be used.

  In addition, embodiments constructed by arbitrarily combining the embodiment and the modified examples are also included in the scope of the present invention. In addition, the present invention can be realized not only as a power storage element as described above but also in a power storage device including one or more power storage elements.

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

10 container 12 lid (wall of container)
12a Outer surface 13a First recess (wall recess)
14a 2nd recessed part (concave part of wall part)
30,330 Positive terminal (electrode terminal)
40,340 Negative terminal (electrode terminal)
DESCRIPTION OF SYMBOLS 50 Safety valve 60,360 Positive electrode current collector 70,370 Negative electrode current collector 80 Convex part 100,200,300 Power storage element 281 Convex part through-hole 361aa, 371aa Caulking end part (connection part)

Claims (7)

An electrical storage element comprising an electrode terminal and a container,
The container is
A safety valve provided on the wall of the container;
A recess formed to be recessed toward the outside of the container at a position where the electrode terminal of the wall is disposed;
A power storage element having a convex portion that is located on a side of the safety valve and protrudes from the wall portion toward the inside of the container. The power storage device according to claim 1, wherein the convex portion is configured by at least one protrusion integrally formed on the wall portion. The power storage device according to claim 1, wherein the convex portion is configured by at least one block-shaped member attached to the wall portion. The electrical storage element as described in any one of Claims 1-3 in which the said some convex part is provided mutually spaced apart. The power storage device according to claim 1, wherein the convex portion includes a through-hole penetrating the convex portion in a direction along the wall portion. A current collector connected to the electrode terminal;
The electrical storage element as described in any one of Claims 1-5 in which a part of said electrical power collector is located in the said recessed part. An electrode body, an electrode terminal, a current collector that electrically connects the electrode body and the electrode terminal, and an electricity storage device including a container,
The container is
A safety valve provided on the wall of the container;
A convex portion located on the side of the safety valve and projecting from the wall portion toward the inside of the container;
The electrical storage element in which the connection part of the said electrode terminal and the said electrical power collector is located in the outer surface side of the said wall part.

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