JP6554842B2 - Electricity storage element - Google Patents

Description

  The present invention relates to a power storage device that includes a container, an electrode terminal, and a current collector, and the electrode terminal and the current collector are fixed to the container.

  2. Description of the Related Art A power storage element that includes a container, an electrode terminal, and a current collector and in which the electrode terminal and the current collector are fixed to the container is widely known. In such a storage element, conventionally, a packing is disposed between the container, the electrode terminal, and the current collector, and the electrode terminal and the current collector are fixed to the container, thereby maintaining the airtight state of the container. (For example, refer to Patent Document 1).

JP 2011-165543 A

  However, in the above-described conventional power storage device, when the container, the electrode terminal, and the current collector are loosely fixed due to use over time or the like, and a gap is generated between the container and the packing, thereby reducing the airtightness of the container. There is a problem that there is.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a power storage element that can suppress a decrease in hermeticity of a container.

  In order to achieve the above object, a power storage device according to one embodiment of the present invention includes a container having a hole, a protruding portion that protrudes along the container, and a connection portion that penetrates the hole. It is disposed between the protruding portion and the container, and includes a sealing member that comes into contact with the container.The container has a recess, and the connection portion is viewed from the direction through the hole. The recess is formed inside the outer edge of the protrusion.

  Further, a part of the sealing member may be disposed inside the concave portion.

  Further, the protruding portion may be a caulking portion formed by caulking.

  Moreover, you may decide that the said protrusion part is comprised from a pair of volt | bolt and nut.

  Further, the recess may be formed on the outer surface of the container.

  According to the electricity storage device of the present invention, since the sealing member is pressed by the protruding portion formed in the connecting portion and is in close contact with the concave portion of the container, it is possible to suppress a decrease in hermeticity of the container.

It is a perspective view which shows typically the external appearance of the electrical storage element which concerns on embodiment of this invention. It is a perspective view which shows each component with which the container main body of the container of the electrical storage element which concerns on embodiment of this invention isolate | separates, and an electrical storage element is provided. It is sectional drawing which shows the structure by which the positive electrode terminal and negative electrode terminal which concern on embodiment of this invention are fixed to a cover body with a positive electrode collector and a negative electrode collector. It is an exploded view which shows each component at the time of decomposing | disassembling the structure around the positive electrode terminal of the electrical storage element which concerns on embodiment of this invention. It is sectional drawing which shows the structure by which the positive electrode terminal which concerns on embodiment of this invention was fixed to the cover body with the positive electrode electrical power collector. It is sectional drawing which shows the structure of the recessed part formed in the cover body which concerns on embodiment of this invention. It is sectional drawing which shows the state by which the 1st sealing member is pressed by the recessed part formed in the cover body which concerns on embodiment of this invention. It is a figure explaining the effect which an electrical storage element concerning an embodiment of the invention shows. It is sectional drawing which shows the structure by which the positive electrode terminal which concerns on the modification 1 of embodiment of this invention was fixed to the cover body with the positive electrode electrical power collector. It is sectional drawing which shows the structure by which the positive electrode terminal which concerns on the modification 2 of embodiment of this invention was fixed to the cover body with the positive electrode electrical power collector. It is sectional drawing which shows the structure by which the positive electrode terminal which concerns on the modification 3 of embodiment of this invention was fixed to the cover body with the positive electrode electrical power collector. It is sectional drawing which shows the structure by which the positive electrode terminal which concerns on the modification 4 of embodiment of this invention was fixed to the cover body with the positive electrode electrical power collector. It is sectional drawing which shows the structure of the 1st sealing member which concerns on the modification 5 of embodiment of this invention.

  Hereinafter, a power storage device according to an embodiment of the present invention will be described with reference to the drawings. Each of the embodiments described below shows a preferred specific example of the present invention. 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.

(Embodiment)
First, the configuration of the power storage element 10 will be described.

  FIG. 1 is a perspective view schematically showing an external appearance of a power storage device 10 according to an embodiment of the present invention. FIG. 2 is a perspective view showing components included in power storage element 10 by separating container body 111 of container 100 of power storage element 10 according to the embodiment of the present invention.

  In these drawings, the Z-axis direction is shown as the up-down direction, and in the following description, the Z-axis direction may be described as the up-down direction. For this reason, the Z-axis direction is not limited to the vertical direction. The same applies to the subsequent drawings.

  The power storage element 10 is a secondary battery that can charge electricity and discharge electricity, and more specifically, is a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. In addition, the electrical storage element 10 is not limited to a nonaqueous electrolyte secondary battery, A secondary battery other than a nonaqueous electrolyte secondary battery may be sufficient, and a capacitor may be sufficient as it.

  As shown in these drawings, the storage element 10 includes a container 100, a positive electrode terminal 200 and a negative electrode terminal 201, a positive electrode current collector 120 and a negative electrode current collector 130, connection portions 300 and 301, an electrode body 140, It has.

  In addition, a liquid such as an electrolytic solution (non-aqueous electrolyte) is sealed inside the container 100 of the electricity storage element 10, but the illustration of the liquid is omitted. In addition, as long as it does not impair the performance of the electrical storage element 10, as the electrolyte solution enclosed with the container 100, there is no restriction | limiting in particular and various things can be selected.

  The container 100 includes a container body 111 having a rectangular cylindrical shape and a bottom, and a lid body 110 that is a plate-like member that closes the opening of the container body 111. That is, the lid body 110 is a wall portion disposed on the upper surface of the container 100. In addition, the container 100 can be sealed by welding the lid body 110 and the container body 111 after the positive electrode current collector 120, the negative electrode current collector 130, the electrode body 140, and the like are accommodated therein. It is possible. The material of the lid 110 and the container body 111 is not particularly limited, but is preferably a weldable metal such as stainless steel, aluminum, aluminum alloy, iron, or plated steel plate.

  The electrode body 140 includes a positive electrode, a negative electrode, and a separator, and is a member that can store electricity. In the positive electrode, a positive electrode active material layer is formed on a positive electrode base material foil which is a long strip-shaped metal foil made of aluminum or an aluminum alloy. The negative electrode is obtained by forming a negative electrode active material layer on a negative electrode substrate foil, which is a long strip-shaped metal foil made of copper, a copper alloy, or the like. The separator is a microporous sheet made of resin.

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

Examples of the positive electrode active material include polyanion compounds such as LiMPO ₄ , LiMSiO ₄ , LiMBO ₃ (M is one or more transition metal elements selected from Fe, Ni, Mn, Co, etc.), titanium, and the like. Use of spinel compounds such as lithium oxide and lithium manganate, lithium transition metal oxides such as LiMO ₂ (M is one or more transition metal elements selected from Fe, Ni, Mn, Co, etc.), etc. Can do.

Examples of the negative electrode active material include lithium metal, lithium alloy (lithium metal such as lithium-aluminum, lithium-silicon, lithium-lead, lithium-tin, lithium-aluminum-tin, lithium-gallium, and wood alloy). Alloys), alloys capable of inserting and extracting lithium, carbon materials (eg, graphite, non-graphitizable carbon, graphitizable carbon, low-temperature calcined carbon, amorphous carbon, etc.), metal oxides, lithium metal oxides ( Li ₄ Ti ₅ O ₁₂ etc.), polyphosphoric acid compounds and the like.

  The electrode body 140 is formed by winding a layered arrangement so that a separator is sandwiched between the negative electrode and the positive electrode, and is electrically connected to the positive electrode current collector 120 and the negative electrode current collector 130. Has been. In the figure, the electrode body 140 has an oval cross section, but it may be circular or elliptical. Further, the shape of the electrode body 140 is not limited to the wound type, and may be a laminated type in which flat plate plates are laminated.

  The positive electrode terminal 200 is an electrode terminal disposed outside the container 100 and electrically connected to the positive electrode of the electrode body 140, and the negative electrode terminal 201 is disposed outside the container 100, and the negative electrode of the electrode body 140 The electrode terminal is electrically connected to. In other words, the positive electrode terminal 200 and the negative electrode terminal 201 lead the electricity stored in the electrode body 140 to the external space of the power storage element 10, and in order to store the electricity in the electrode body 140, It is a conductive electrode terminal for introducing.

  The positive electrode terminal 200 and the negative electrode terminal 201 are attached to the lid body 110 disposed above the electrode body 140. Specifically, the positive electrode terminal 200 is fixed to the lid body 110 together with the positive electrode current collector 120 by the connection portion 300. Similarly, the negative electrode terminal 201 is fixed to the lid 110 together with the negative electrode current collector 130 by the connection portion 301. A detailed configuration in which the positive electrode terminal 200 and the negative electrode terminal 201 are fixed to the lid 110 together with the positive electrode current collector 120 and the negative electrode current collector 130 will be described later.

  The positive electrode current collector 120 and the negative electrode current collector 130 are disposed on the inner side of the container 100, that is, on the inner surface (the surface on the negative side in the Z-axis direction) of the lid 110. Specifically, the positive electrode current collector 120 is disposed between the positive electrode of the electrode body 140 and the side wall of the container body 111, and is electrically connected to the positive electrode terminal 200 and the positive electrode of the electrode body 140. It is a member provided with rigidity. The negative electrode current collector 130 is disposed between the negative electrode of the electrode body 140 and the side wall of the container body 111, and has conductivity and rigidity electrically connected to the negative electrode terminal 201 and the negative electrode of the electrode body 140. It is a member.

  The positive electrode current collector 120 is formed of aluminum, an aluminum alloy, or the like, like the positive electrode base material foil of the electrode body 140. In addition, the negative electrode current collector 130 is formed of copper, a copper alloy, or the like, like the negative electrode base foil of the electrode body 140.

  The connection part 300 is a member that connects the positive electrode terminal 200 and the positive electrode current collector 120, and the connection part 301 is a member that connects the negative electrode terminal 201 and the negative electrode current collector 130. Specifically, the connection unit 300 fixes the positive electrode terminal 200 and the positive electrode current collector 120 to the lid 110, and the connection unit 301 fixes the negative electrode terminal 201 and the negative electrode current collector 130 to the lid 110. .

  Further, the connection parts 300 and 301 are formed of a conductive member such as metal. In addition, it is preferable that the connection part 300 is formed with aluminum or aluminum alloy etc. like the positive electrode base material foil of the positive electrode collector 120 and the electrode body 140, and the connection part 301 is formed with the negative electrode current collector 130 and the electrode. Like the negative electrode base foil of the body 140, it is preferably formed of copper or a copper alloy.

  Next, a configuration in which the positive electrode terminal 200 and the negative electrode terminal 201 are fixed to the lid body 110 together with the positive electrode current collector 120 and the negative electrode current collector 130 by the connection portions 300 and 301 will be described. First, an outline of the configuration will be described.

  FIG. 3 is a cross-sectional view showing a configuration in which the positive electrode terminal 200 and the negative electrode terminal 201 according to the embodiment of the present invention are fixed to the lid body 110 together with the positive electrode current collector 120 and the negative electrode current collector 130. Specifically, FIG. 2 shows a configuration around the positive electrode terminal 200 and the negative electrode terminal 201 when the power storage element 10 shown in FIG. 2 is cut along a plane parallel to the XZ plane including the III-III line. It is sectional drawing.

  As shown in the figure, the storage element 10 further includes a first sealing member 400 and a second sealing member 500 on the positive electrode terminal 200 and positive electrode current collector 120 side. A connection seat 210 and a connection bolt 220 are provided. Similarly, the storage element 10 further includes a first sealing member 401 and a second sealing member 501 on the negative electrode terminal 201 and negative electrode current collector 130 side, and the negative electrode terminal 201 is connected to the connection seat 202. And a connecting bolt 203.

  The positive electrode current collector 120 is composed of a flat terminal-side arrangement portion 121 connected to the positive electrode terminal 200 via the connection portion 300 and two long legs joined to one end of the electrode body 140. A certain electrode body connecting portion 122. Similarly, the negative electrode current collector 130 includes two plate-like terminal-side arrangement portions 131 connected to the negative electrode terminal 201 via the connection portion 301 and two elongated shapes bonded to the other end of the electrode body 140. And an electrode body connecting portion 132 which is a leg.

  The connection seats 210 and 202 are main body portions of electrode terminals arranged outside the container 100. That is, the connection seat 210 is a main body portion of the positive electrode terminal 200 and is disposed above the lid body 110 (on the positive side in the Z-axis direction). Further, the connection seat 202 is a main body portion of the negative electrode terminal 201 and is disposed above the lid body 110 (Z-axis direction plus side). The connection seats 210 and 202 are formed of a conductive member such as metal (for example, aluminum).

  Further, the connection seat 210 is fixed to the lid body 110 together with the terminal side arrangement portion 121 of the positive electrode current collector 120 by the connection portion 300. Further, the connection seat 202 is fixed to the lid body 110 together with the terminal side arrangement portion 131 of the negative electrode current collector 130 by the connection portion 301.

  The connection bolts 220 and 203 are bolt-shaped members arranged to protrude outward from the container 100 from the connection seats 210 and 202, and are connected to a bus bar (not shown) that connects the electrode terminals of the power storage element 10. . The connection bolts 220 and 203 are formed of a conductive member such as metal (for example, aluminum or stainless steel).

  The first sealing members 400 and 401 are packings at least part of which are disposed between the positive electrode terminal 200 and the negative electrode terminal 201 and the lid body 110. The first sealing members 400 and 401 are preferably made of an insulating member having a lower rigidity than the lid 110 and are made of, for example, a resin such as polyphenylene sulfide (PPS) or polypropylene (PP). Is formed.

  The second sealing members 500 and 501 are packing in which at least a part thereof is arranged between the terminal side arrangement part 121 of the positive electrode current collector 120 and the terminal side arrangement part 131 of the negative electrode current collector 130 and the lid body 110. It is. The second sealing members 500 and 501 are preferably made of an insulating member having a rigidity lower than that of the lid body 110. For example, the second sealing members 500 and 501 are made of a resin such as polyphenylene sulfide (PPS) or polypropylene (PP). Is formed.

  Next, details of a configuration in which the positive electrode terminal 200 and the negative electrode terminal 201 are fixed to the lid body 110 together with the positive electrode current collector 120 and the negative electrode current collector 130 by the connection portions 300 and 301 will be described. Since the configuration on the positive electrode terminal 200 side and the configuration on the negative electrode terminal 201 side have the same configuration, the following description focuses on the configuration on the positive electrode terminal 200 side, and the configuration on the negative electrode terminal 201 side. Are omitted or simplified.

  First, the detail of each component before fixing the positive electrode terminal 200 and the positive electrode electrical power collector 120 to the cover body 110 is demonstrated.

  FIG. 4 is an exploded view showing each component when the configuration around positive electrode terminal 200 of power storage device 10 according to the embodiment of the present invention is disassembled. Specifically, FIG. 3 is a cross-sectional view (a diagram of each component before assembly) when the components around the positive electrode terminal 200 shown in FIG. 3 are separated.

  As shown in the figure, the connection seat 210 of the positive electrode terminal 200 is a rectangular and flat member, and a first connection seat opening 211 and a second connection seat opening 212 are formed. The first connection seat opening 211 is a through-hole having a circular cross section into which a column part 310 of the connection part 300 described later is inserted, and the second connection seat opening 212 is a connection bolt main body of the connection bolt 220 described later. The cross section into which 221 is inserted is a circular through hole. In addition, the shape of the 1st connection seat opening part 211 and the 2nd connection seat opening part 212 should just be a shape corresponding to the outer shape of the column part 310 and the connection bolt main body 221, for example, a cross section is an ellipse shape or a rectangular shape. It may be a through hole or a notch cut into a semicircular shape or a rectangular shape.

  The connection bolt 220 has a connection bolt main body 221 and a head portion 222. The connection bolt main body 221 is a cylindrical portion protruding upward (in the Z-axis direction plus side) from the head 222, and has a thread on the outer periphery. The head 222 has a flat, for example, octagonal prism shape.

  The connection seat 210 and the connection bolt 220 may be integrally formed. Further, the positive terminal 200 may be configured to have only the connection seat 210 without having the connection bolt 220. In this case, the connection seat 210 is not formed with the second connection seat opening 212, and the positive terminal 200 is joined to the bus bar connecting the electrode terminals of the power storage element 10 by welding.

  The connection part 300 is a rivet (hollow rivet) whose upper part and lower part (Z-axis direction positive side and negative side parts) are hollow. Specifically, the connecting portion 300 protrudes outward from a substantially columnar position of the column portion 310 having a space 311 formed inside the upper portion and a space 312 formed inside the lower portion, and the column portion 310. It has a flat flange portion 320 having, for example, an octagonal prism shape. The column part 310 has an upper part inserted into the first connection seat opening 211, and a lower part formed into a cylindrical part opening part 421, a lid opening part 112c, a second sealing member opening part 510, which will be described later, It is inserted into the current collector opening 123.

  The first sealing member 400 is a rectangular and flat member, a flat plate-like portion 410, and a cylindrical tubular portion 420 that protrudes downward (minus in the Z-axis direction) from the plate-like portion 410. And have.

  Here, the plate-like portion 410 is formed with a first plate-like portion recess 411 and a second plate-like portion recess 412. The flange portion 320 of the connection portion 300 is inserted and fitted into the first plate-like portion concave portion 411. The head 222 of the connection bolt 220 is inserted into and fitted into the second plate-shaped portion recess 412. Moreover, the 1st plate-shaped part recessed part 411 and the 2nd plate-shaped part recessed part 412 are octagonal recessed parts by the top view. In addition, the shape of the 1st plate-shaped part recessed part 411 and the 2nd plate-shaped part recessed part 412 should just be a shape corresponding to the outer shape of the flange part 320 and the head part 222, and is not limited to an octagon shape.

  In addition, a cylindrical portion opening 421 is formed in the cylindrical portion 420. The column part 310 of the connection part 300 is inserted into the cylindrical part opening part 421. Moreover, the cylindrical part opening part 421 is a through-hole with a circular cross section. In addition, the cylindrical part opening part 421 should just be a shape corresponding to the outer shape of the pillar part 310, for example, a cross section may be an ellipse shape or a rectangular shape. Further, the cylindrical portion 420 is inserted into the lid opening 112c and the second sealing member opening 510.

  The lid body 110 is a rectangular and flat member having an outer surface 112a (a surface on the plus side in the Z-axis direction) and an inner surface 112b (a surface on the minus side in the Z-axis direction), and a lid body opening portion 112c is formed. Yes. The cylindrical portion 420 of the first sealing member 400 is inserted into the lid opening 112c. The lid opening 112c is a through hole having a circular cross section. Note that the outer shape of the cylindrical portion 420 and the cross-sectional shape of the lid opening 112c are not particularly limited as long as they correspond to each other.

  In addition, an annular recess (a later-described recess 113) surrounding the lid opening 112 c is formed on at least one of the outer surface 112 a and the inner surface 112 b of the lid 110. A detailed description of the recess 113 will be described later.

  The second sealing member 500 is a rectangular and flat member, and a second sealing member opening 510 and a second sealing member recess 520 are formed. The cylindrical portion 420 of the first sealing member 400 is inserted into the second sealing member opening 510. In the second sealing member recess 520, the terminal side arrangement part 121 of the positive electrode current collector 120 is arranged inward. The second sealing member opening 510 is a through hole having a circular cross section. The second sealing member recess 520 is a rectangular recess. In addition, the outer shape of the cylindrical part 420 and the cross-sectional shape of the second sealing member opening 510 may be shapes corresponding to each other, and are not particularly limited.

  In the positive electrode current collector 120, a current collector opening 123 is formed in the terminal side arrangement portion 121. The column part 310 of the connection part 300 is inserted into the current collector opening 123. The current collector opening 123 is a through hole having a circular cross section. The shape of the current collector opening 123 may be a shape corresponding to the outer shape of the column portion 310. For example, the cross section is cut into an elliptical or rectangular through hole, or a semicircular or rectangular shape. It may be a notch.

  Next, the configuration after the positive electrode terminal 200 and the positive electrode current collector 120 are fixed to the lid 110 will be described.

  FIG. 5 is a cross-sectional view illustrating a configuration in which the positive electrode terminal 200 according to the embodiment of the present invention is fixed to the lid 110 together with the positive electrode current collector 120. Specifically, FIG. 3 is an enlarged cross-sectional view showing an enlarged configuration around the positive electrode terminal 200 shown in FIG.

  Moreover, FIG. 6 is sectional drawing which shows the structure of the recessed part 113 formed in the cover body 110 which concerns on embodiment of this invention. Specifically, in FIG. 5, the configuration around the positive electrode terminal 200 shown in FIG. 5 is cut by a plane parallel to the XY plane including the VI-VI line (a plane including the outer surface 112a of the lid 110). It is sectional drawing which shows this structure.

  Moreover, FIG. 7 is sectional drawing which shows the state in which the 1st sealing member 400 is pressed by the recessed part 113 formed in the cover body 110 which concerns on embodiment of this invention. Specifically, (a) in the figure is a cross-sectional view showing a state before the first sealing member 400 is pressed into the recess 113, and (b) in FIG. It is sectional drawing which shows the state after the stop member 400 was pressed.

  First, as shown in FIG. 5, in the first sealing member 400, the plate-like portion 410 is disposed between the connection seat 210 of the positive terminal 200 and the flange portion 320 of the connection portion 300 and the lid 110. Yes. Further, the plate-like portion 410 is disposed in contact with the outer surface 112a of the lid 110. In addition, the plate-shaped part 410 should just be arrange | positioned between at least one of the connection seat 210 and the flange part 320, and the cover body 110. FIG.

  Further, the cylindrical portion 420 passes through the lid body 110 and the second sealing member 500 and is disposed around the connection portion 300. Further, the second sealing member 500 is disposed between the terminal-side arrangement portion 121 of the positive electrode current collector 120 and the lid 110. The second sealing member 500 is disposed in contact with the inner surface 112b of the lid 110.

  In the connection part 300, the column part 310 penetrates the connection seat 210, the lid body 110, the first sealing member 400, the second sealing member 500, and the terminal side arrangement part 121 of the positive electrode current collector 120. Are arranged. In addition, the connection part 300 arranges the first sealing member 400 and the second sealing member 500 with the lid 110 sandwiched between the connection seat 210 and the terminal side arrangement part 121 of the positive electrode current collector 120. Thus, the connection seat 210 and the positive electrode current collector 120 are fixed to the lid 110 by sandwiching the connection seat 210 and the terminal side arrangement portion 121.

  That is, the connection seat 210 and the terminal side arrangement portion 121 are caulked by the rivet as the connection portion 300 with the first sealing member 400, the lid body 110, and the second sealing member 500 sandwiched therebetween, and the lid It is fixed to the body 110. At this time, the upper portion and the lower portion of the connecting portion 300 are caulked so that the upper space 311 and the lower space 312 of the column portion 310 are expanded outward, and the upper end portion and the lower end portion of the column portion 310 are The first protrusion 330 and the second protrusion 340 are formed by being pressed so as to spread outward.

  That is, the first projecting portion 330 and the second projecting portion 340 are caulked portions formed by caulking, and are disposed so as to project along the lid body 110 so as to sandwich the lid body 110. Specifically, the first projecting portion 330 is an annular portion disposed on the positive terminal 200 side (Z-axis direction plus side) end of the connecting portion 300, that is, on the outside of the container 100 and above the connecting seat 210. The caulking part. Further, the second protruding portion 340 is disposed at the end of the connecting portion 300 on the positive electrode current collector 120 side (Z-axis direction negative side), that is, inside the container 100 and below the terminal side arrangement portion 121. An annular caulking portion. Further, the space 311 of the connecting portion 300 is formed such that the positive side in the Z-axis direction (the first protruding portion 330 side) is wider than the negative side in the Z-axis direction. The space 312 is formed such that the Z-axis direction minus side (the second protrusion 340 side) is wider than the Z-axis direction plus side.

  With this configuration, the connection seat 210 and the first sealing member 400 are disposed between the first protrusion 330 and the lid 110, and the positive current collector is disposed between the second protrusion 340 and the lid 110. The terminal side arrangement part 121 of the body 120 and the second sealing member 500 are arranged.

  As shown in FIGS. 5 and 6, a recess 113 is formed in at least one of the outer surface 112 a and the inner surface 112 b of the lid 110. In the present embodiment, the recess 113 is formed on the outer surface 112 a of the lid 110.

  Here, the recess 113 is a groove formed in an annular shape so as to surround the connection portion 300. Specifically, the recess 113 is formed in an annular shape so as to surround the column part 310 of the connection part 300 and the cylindrical part 420 of the first sealing member 400. More specifically, the recess 113 is formed by circularly connecting circular arc-shaped grooves having a cross section of 1 mm in width and a depth of about 0.1 mm to 0.2 mm. In addition, the recessed part 113 should just be formed in cyclic | annular form, However, In order to maintain an airtight state equally, it is preferable to form in the annular | circular shape.

  The first sealing member 400 is disposed so as to be in contact with the outer surface 112a, which is the surface of the outer surface 112a and the inner surface 112b of the lid 110, on which the recess 113 is formed, and to face the recess 113. That is, the first sealing member 400 is disposed so as to abut on the surface including the region where the recess 113 is formed in the outer surface 112 a of the lid 110.

  In addition, the recess 113 is more than the outer edge portions of both the first protrusion 330 and the second protrusion 340 when viewed from the direction in which the connection portion 300 penetrates the lid opening 112c of the lid 110 (Z-axis direction). Arranged inside. That is, all the portions of the recess 113 are disposed on the inner side of the outer edge portion of the first protruding portion 330 and on the inner side of the outer edge portion of the second protruding portion 340. In addition, although the recessed part 113 should just be arrange | positioned inside the outer edge part of both the 1st protrusion part 330 and the 2nd protrusion part 340, in order to maintain an airtight state, it forms near the connection part 300. FIG. Is preferred.

  Here, the outer edge of the first protrusion 330 is a line connecting the outermost edges of the first protrusion 330 when the first protrusion 330 is viewed from the Z-axis direction. All the parts are arranged in a region surrounded by the line. Similarly, the outer edge portion of the second projecting portion 340 is a line connecting the outermost edges of the second projecting portion 340 when the second projecting portion 340 is viewed from the Z-axis direction. All the parts are arranged in a region surrounded by the line. In other words, the recess 113 is disposed in a region where both the first protrusion 330 and the second protrusion 340 overlap when viewed from the Z-axis direction.

  Further, the recess 113 is disposed around the space 312 below the column part 310. That is, a deep space 312 that reaches the position of the recess 113 is formed in the column portion 310. Here, since the space 312 is expanded outward when it is caulked, the first sealing member 400 is pressed from the column part 310 even at the position of the recess 113, and the airtightness is improved.

  As shown in FIGS. 5 and 7, a part of the first sealing member 400 is in contact with the lid 110 at the edge of the recess 113, and is disposed inside the recess 113 along the edge. Has been. That is, the plate-like portion 410 is pressed by pressing the plate-like portion 410 of the first sealing member 400 against the recess 113 formed on the outer surface 112a of the lid 110 by the first protrusion 330 and the second protrusion 340. A part 413 of this is difficult to fit in the recess 113. In FIG. 6, for convenience of explanation, a part 413 of the plate-like portion 410 that is difficult to insert in the recess 113 is omitted.

  As a result, the plate-like portion 410 is inserted into the recess 113. In this case, the plate-like portion 410 is inserted into the entire recess 113, as shown in FIG. A configuration in which the gap 114 is formed may be used. In this way, if the gap 114 is formed inside the recess 113, the leaked electrolyte can be stored in the gap 114, so that the electrolyte can be prevented from leaking to the outside. There is an effect.

  As described above, according to the electricity storage device 10 according to the embodiment of the present invention, the concave portion 113 of the lid body 110 of the container 100 has the two protruding portions (the first protruding portion 330 and the second protruding portion) of the connecting portion 300. 340). For this reason, when the positive electrode terminal 200 and the positive electrode current collector 120 are fixed to the lid 110 by sandwiching the lid 110 between the two protrusions, the first sealing member 400 is pressed by the two protrusions. Closely contacts the lid 110 at the position of the recess 113. Thereby, the airtightness around the connection part 300 can be improved.

  In particular, since the first sealing member 400 has a cylindrical portion 420 and the concave portion 113 is formed on the outer surface 112a of the lid 110, the first portion is formed in the concave portion 113 as shown in FIG. When the plate-like portion 410 of the sealing member 400 is inserted, a plurality of airtight leak paths can be covered. FIG. 8 is a diagram for explaining the effect produced by the electrical storage element 10 according to the embodiment of the present invention.

  That is, as shown in the figure, in the configuration in which the first sealing member 400 has the cylindrical portion 420 as in the present embodiment, when the pressure due to caulking is loosened, the airtight leakage paths P1 and P2 are two. Airtight leaks often occur on the route. For this reason, by forming the recessed part 113 in the outer surface 112a of the cover body 110, the airtight leak in the said 2 route | root can be suppressed.

  Therefore, the recess 113 may be formed on the inner surface 112b of the lid 110 (in this case, only the airtight leak path P1 is covered). However, in the configuration of the present embodiment, the recess 113 is formed on the outer surface 112a of the lid 110. Preferably formed. For the same reason, in the present embodiment, more airtight leakage paths than in the case where a recess is formed in the connecting portion 300 (rivet) (in this case, neither airtight leakage path in the two routes can be covered). Therefore, it is more effective to form the recess 113 in the lid 110.

  In addition, when the convex part is formed in the lid | cover body 110 instead of a recessed part, if the pressing force to the convex part of the 1st sealing member 400 is small, the 1st sealing member 400 will be in the said convex part. By contacting, it becomes impossible to contact the surface around the convex part of the cover body 110, and there exists a possibility that an airtight state may not be maintained. For this reason, it is more effective to form the recess 113 in the lid 110.

  Moreover, since the 1st protrusion part 330 and the 2nd protrusion part 340 are caulking parts formed by caulking, the caulking causes the first sealing member 400 to be more strongly inserted into the recess 113 of the lid 110 and connected. The airtightness around the portion 300 can be improved.

  Further, since the recess 113 is formed in an annular shape so as to surround the connection portion 300, the airtightness around the connection portion 300 can be further improved.

  In addition, since a part of the first sealing member 400 is in contact with the lid 110 at the edge of the recess 113 and is disposed in the recess 113, the airtightness around the connection portion 300 can be improved.

  Moreover, since the recessed part 113 is formed in the outer surface 112a of the cover body 110, even if foreign materials, such as metal powder which generate | occur | produced at the time of the process of the recessed part 113 remain in the recessed part 113 or its periphery, the said foreign material remains in the container 100. Intrusion inside can be prevented.

  In addition, any one of the 1st protrusion part 330 and the 2nd protrusion part 340 may be fixed by welding etc. instead of caulking. That is, in the present embodiment, at least one of the first projecting portion 330 and the second projecting portion 340 may be a caulking portion formed by caulking. In addition to the present embodiment, a configuration in which both the first projecting portion 330 and the second projecting portion 340 are not caulked portions is also conceivable. Details of this configuration will be described in detail in the following modified examples (modified examples 3 and 4).

(Modification 1)
Next, Modification 1 of the above embodiment will be described. In this modification, a concave portion having a rectangular cross section is formed in the lid. FIG. 9 is a cross-sectional view showing a configuration in which positive electrode terminal 200 according to Modification 1 of the embodiment of the present invention is fixed to lid 110 a together with positive electrode current collector 120. Specifically, this figure corresponds to FIG.

  As shown in the figure, the electricity storage element in this modification has a lid 110a instead of the lid 110 included in the electricity storage element 10 in the above embodiment. The lid 110a has a recess 113a instead of the recess 113 formed in the lid 110 in the above embodiment. Since other configurations are the same as those in the above embodiment, the description thereof is omitted.

  The recess 113a is a groove having a rectangular cross section formed in an annular shape (annular shape) so as to surround the connecting portion 300 on the outer surface 112a of the lid 110a. Similarly to the above-described embodiment, the recess 113a is an outer edge portion of both the first protrusion 330 and the second protrusion 340 when viewed from the direction in which the connection portion 300 penetrates the lid 110a (Z-axis direction). It is arranged inside. Accordingly, the plate-like portion 410 of the first sealing member 400 is pressed by the first protrusion 330 and the second protrusion 340 against the recess 113a of the lid 110a, so that a part 413 of the plate-like portion 410 is formed. The recess 113a is not easily inserted.

  As mentioned above, also in the electrical storage element which concerns on the modification 1 of embodiment of this invention, there can exist an effect similar to the said embodiment. In particular, since the recess 113a is a groove having a rectangular cross section, the first sealing member 400 is less likely to loosen into the recess 113a as compared to the above embodiment. Thereby, the airtightness around the connection part 300 can further be improved.

(Modification 2)
Next, a second modification of the above embodiment will be described. In this modified example, not the first sealing member but the second sealing member has a cylindrical portion, and the recess is formed on the inner surface of the lid. FIG. 10 is a cross-sectional view showing a configuration in which positive electrode terminal 200 according to modification 2 of the embodiment of the present invention is fixed to lid body 110b together with positive electrode current collector 120. Specifically, this figure corresponds to FIG.

  As shown in the figure, the electricity storage device in this modification is a lid 110b, instead of the lid 110, the first sealing member 400, and the second sealing member 500 included in the electricity storage device 10 in the above embodiment. It has the 1st sealing member 400a and the 2nd sealing member 500a. The lid 110b has a recess 113b formed on the inner surface 112b instead of the recess 113 formed on the outer surface 112a of the lid 110 in the above embodiment. The 1st sealing member 400a does not have the cylindrical part 420 which the 1st sealing member 400 in the said embodiment has, and the 2nd sealing member 500a has the plate-shaped part 530, the cylindrical part 540, and have. Since other configurations are the same as those in the above embodiment, the description thereof is omitted.

  In other words, the power storage element in the present modified example is one in which the configurations of the first sealing member 400 and the second sealing member 500 of the power storage element 10 in the above embodiment are reversed and the position of the recess 113 is upside down. It is.

  Specifically, a recess 113b is formed on at least one of the outer surface 112a and the inner surface 112b of the lid 110b. In the present embodiment, the recess 113b is an annular groove formed on the inner surface 112b of the lid 110b so as to surround the connection portion 300. Similarly to the above-described embodiment, the recess 113b is an outer edge portion of both the first protrusion 330 and the second protrusion 340 when viewed from the direction in which the connecting portion 300 penetrates the lid 110b (Z-axis direction). It is arranged inside.

  In addition, the second sealing member 500a is disposed in contact with the inner surface 112b, which is the surface of the outer surface 112a and the inner surface 112b of the lid body 110b, on which the recess 113b is formed, and is opposed to the recess 113b. That is, the second sealing member 500a is connected to the plate-like portion 530 disposed between the terminal-side arrangement portion 121 and the lid body 110b and in contact with the inner surface 112b of the lid body 110b. And a cylindrical portion 540 disposed around the portion 300.

  Thereby, the plate-like portion 530 of the second sealing member 500a is pressed by the first protrusion 330 and the second protrusion 340 against the recess 113b formed on the inner surface 112b of the lid 110b. A part 531 of 530 is hard to enter into the recess 113b.

  As mentioned above, also in the electrical storage element which concerns on the modification 2 of embodiment of this invention, there can exist an effect similar to the said embodiment. In particular, since the recess 113b is formed on the inner surface 112b of the lid 110b, it is possible to improve the airtightness inside the container 100, and to suppress leakage of the electrolytic solution or the like to the outside of the container 100. it can.

  Further, since the second sealing member 500a has a cylindrical portion 540 and the recess 113b is formed on the inner surface 112b of the lid 110b, a plurality of airtight leaks are formed as in the above embodiment. Can cover the path. That is, in the present modification, the recess 113b may be formed on the outer surface 112a of the lid 110b. However, in the configuration of the present modification, the recess 113b is formed on the inner surface 112b of the lid 110b. The formation is preferable because many airtight leak paths can be covered.

(Modification 3)
Next, Modification 3 of the above embodiment will be described. In this modification, the connecting portion is fixed not by caulking but by bolting. FIG. 11 is a cross-sectional view showing a configuration in which positive electrode terminal 200 according to Modification 3 of the embodiment of the present invention is fixed to lid 110 together with positive electrode current collector 120. Specifically, this figure corresponds to FIG.

  As shown in the figure, the electricity storage device in this modification has a connection portion 300a instead of the connection portion 300 included in the electricity storage device 10 in the above embodiment. Instead of the configuration in which the first protruding portion 330 is formed on the upper portion of the column portion 310 as in the above embodiment, the connecting portion 300a has the first protruding portion 330a formed on the upper portion of the column portion 310a. Since other configurations are the same as those in the above embodiment, the description thereof is omitted.

  The 1st protrusion part 330a has the bolt part 331a and the nut part 332a. The bolt part 331a is a bolt part formed with an external thread formed on the top of the pillar part 310a, and the nut part 332a is a nut part with an internal thread into which the bolt part 331a is inserted. The bolt part 331a is inserted into the first connection seat opening 211, and is tightened by the nut part 332a.

  In addition, the recess 113 formed on the outer surface 112a of the lid body 110 has a first projecting portion 330a (nut portion 332a) and a second projecting portion as viewed from the direction in which the connecting portion 300a penetrates the lid body 110 (Z-axis direction). The portion 340 is disposed on the inner side than both outer edge portions. With this configuration, the first sealing member 400 is pressed against the recess 113 by the first protrusion 330 a and the second protrusion 340. That is, the power storage element in the present modification realizes the first protruding portion 330 as the caulking portion on the upper portion of the connecting portion 300 in the above-described embodiment by the first protruding portion 330a configured by a set of bolts and nuts. Is.

  As mentioned above, also in the electrical storage element which concerns on the modification 3 of embodiment of this invention, there can exist an effect similar to the said embodiment. In particular, since the first projecting portion 330a is composed of a set of bolts and nuts, when the first projecting portion 330a is loosened, the looseness can be improved by retightening the nut. . Moreover, the looseness of the connection part 300 can also be detected from the looseness of the nut.

  A spring washer may be provided between the nut portion 332a and the connection seat 210. Thereby, the clamping force by the nut part 332a can be maintained, and the airtight state around the connection part 300 can be maintained.

  Further, instead of the first protrusion 330a, the second protrusion 340 may be composed of a set of bolts and nuts. Furthermore, both the first protrusion 330a and the second protrusion 340 may be configured by a set of bolts and nuts. That is, at least one of the first projecting portion 330a and the second projecting portion 340 only needs to be composed of a set of bolts and nuts.

(Modification 4)
Next, Modification 4 of the above embodiment will be described. In this modification, the upper part of the connection part is formed integrally with the electrode terminal. FIG. 12 is a cross-sectional view showing a configuration in which positive electrode terminal 200 a according to modification 4 of the embodiment of the present invention is fixed to lid 110 together with positive electrode current collector 120. Specifically, this figure corresponds to FIG.

  As shown in the figure, the electricity storage device in this modification has a positive electrode terminal 200a and a connection portion 300b instead of the positive electrode terminal 200 and the connection portion 300 included in the electricity storage device 10 in the above embodiment. Here, the positive electrode terminal 200a and the connection portion 300b are integrally formed. That is, the positive electrode terminal 200a and the connection portion 300b are integrated by integrally forming the connection seat 210a included in the positive electrode terminal 200a and the column portion 310b included in the connection portion 300b. Since other configurations are the same as those in the above embodiment, the description thereof is omitted.

  Here, the connection seat 210a is a rectangular and flat plate member as in the above embodiment. Further, the column part 310b has a substantially central part formed integrally with the connection seat 210a, a solid protrusion part is formed at the upper part, and a second protrusion part 340 is formed at the lower part. In addition, the protrusion part of the upper part of the pillar part 310b may not be solid but may be hollow.

  As a result, the peripheral portion of the column portion 310b included in the connection seat 210a is a protruding portion arranged along the lid body 110 so as to sandwich the lid body 110 with the second protruding portion 340, and this deformation In the example, this is the first protrusion 330b.

  In other words, the recess 113 formed on the outer surface 112a of the lid 110 has both the first protrusion 330b and the second protrusion 340 when viewed from the direction in which the connection portion 300b penetrates the lid 110 (Z-axis direction). It arrange | positions inside an outer edge part.

  As mentioned above, also in the electrical storage element which concerns on the modification 4 of embodiment of this invention, there can exist an effect similar to the said embodiment. In particular, since the positive electrode terminal 200a and the connection portion 300b are integrally formed, the number of components can be reduced, and a power storage element can be easily manufactured.

  In addition, the positive electrode terminal 200a may have a configuration without the connection bolt 220 as in the above embodiment. In this case, you may comprise so that the protrusion part of the upper part of the connection part 300b may play the role of the connection bolt 220. FIG.

  Further, as in the third modification, the second projecting portion 340 may be composed of a set of bolts and nuts.

  Moreover, the structure by which the terminal side arrangement | positioning part 121 and the connection part 300b of the positive electrode collector 120 were integrated instead of the positive electrode terminal 200a and the connection part 300b may be sufficient. That is, the terminal side arrangement part 121 of the positive electrode current collector 120 and the column part 310b of the connection part 300b may be integrally formed. In this case, the peripheral part of the column part 310b included in the terminal side arrangement part 121 becomes a second protruding part that is arranged so as to protrude along the lid 110 so as to sandwich the lid 110 with the first protruding part. . Also in this structure, the recessed part 113 is arrange | positioned inside the outer edge part of both the 1st protrusion part and the 2nd protrusion part seeing from the Z-axis direction, and there can exist the same effect.

(Modification 5)
Next, Modification 5 of the above embodiment will be described. In the present modification, a convex portion is formed on the first sealing member and is fitted into the concave portion 113 of the lid 110. FIG. 13: is sectional drawing which shows the structure of the 1st sealing member 400b which concerns on the modification 5 of embodiment of this invention. Specifically, this figure corresponds to FIG.

  As shown to (a) of the figure, the electrical storage element in this modification has the 1st sealing member 400b instead of the 1st sealing member 400 which the electrical storage element 10 in the said embodiment has. . The first sealing member 400b has a plate-like portion 410b instead of the plate-like portion 410 included in the first sealing member 400 in the above embodiment. Since other configurations are the same as those in the above embodiment, the description thereof is omitted.

  The plate-like portion 410 b is formed with a convex portion 414 that is disposed so as to face the concave portion 113 formed on the outer surface 112 a of the lid 110 and is fitted to the concave portion 113. The convex portion 414 is formed larger than the inner space of the concave portion 113. That is, the convex portion 414 is formed so that the volume of the protruding portion is larger than the volume of the inner space of the concave portion 113. As a result, as shown in FIG. 5B, when the convex portion 414 and the concave portion 113 are fitted, no gap is formed in the concave portion 113, and the first sealing member 400b, the lid body 110, Is in close contact.

  As mentioned above, also in the electrical storage element which concerns on the modification 5 of embodiment of this invention, there can exist an effect similar to the said embodiment. In particular, since the convex portion 414 is formed on the first sealing member 400b, the adhesion between the first sealing member 400b and the lid 110 can be improved, and the airtightness around the connection portion 300 can be improved. .

  In addition, the convex part 414 is formed smaller than the inner space of the recessed part 113, and when the convex part 414 and the recessed part 113 fit, the structure in which a space | gap is formed in the recessed part 113 may be sufficient.

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

  For example, in the above-described embodiment and the modification thereof, the concave portion formed in the lid body is the outer edge portion of both the first projecting portion and the second projecting portion when viewed from the direction in which the connecting portion penetrates the lid opening. It was decided that it was formed inside. However, as viewed from the above direction, the concave portion only needs to be formed inside the outer edge portion of one of the first protrusion and the second protrusion. Moreover, it is good also considering the flange part 320 formed in the connection part as said protrusion part. That is, when viewed from the above direction, the concave portion may be formed inside the outer edge portion of the flange portion 320. Even in such a case, it is possible to achieve an effect that the deterioration of the airtightness of the container can be suppressed.

  Moreover, in the said embodiment and its modification, although the recessed part formed in the cover body was decided to be the groove | channel formed in cyclic | annular form so that the perimeter of a connection part might be enclosed, the said recessed part is a connection part. The grooves may be discretely arranged around the connection portion instead of the entire circumference.

  Moreover, in the said embodiment and its modifications 1-4, although the space | gap was formed in the inner side of the recessed part formed in the cover body, the said space | gap does not need to be formed.

  Moreover, in the said embodiment and its modification, although the recessed part was formed in the cover body, depending on a structure, you may decide to be formed in any wall part of the container main body 111. FIG. .

  Moreover, in the said embodiment and its modification, although the rivet used as a connection part was a hollow rivet, it may be a solid rivet.

  Moreover, in the said embodiment and its modification, the electrical storage element was provided with one connection part (rivet) with respect to one electrode terminal, However, A some connection part with respect to one electrode terminal (Rivets) may be provided. In this case, it is sufficient that the above-described configuration is adopted for at least one connecting portion, but it is preferable that the above-described configuration is adopted for all the connecting portions in order to improve the airtightness of the electrode terminal.

  Moreover, in the said embodiment and its modification, although the electrical storage element was provided with one electrode body, the structure provided with the several electrode body may be sufficient.

  Moreover, the form constructed | assembled combining the said embodiment and the said modification arbitrarily is also contained in the scope of the present invention. For example, the modification of the modification 1 may be applied to the above modifications 2 to 5, the modification of the modification 2 may be applied to the modifications 3 to 5, and the modifications 3 and 4 may be applied. The modification of Modification 5 may be applied.

  The present invention can provide a power storage element that can suppress a decrease in hermeticity of a container.

DESCRIPTION OF SYMBOLS 10 Power storage element 100 Container 110, 110a, 110b Cover body 111 Container main body 112a Outer surface 112b Inner surface 112c Cover body opening 113, 113a, 113b Recessed part 114 Cavity 120 Positive electrode current collector 121, 131 Terminal side arrangement part 122, 132 Electrode body connection Part 123 Current collector opening part 130 Negative electrode current collector 140 Electrode body 200, 200a Positive electrode terminal 201 Negative electrode terminal 202, 210, 210a Connection seat 203, 220 Connection bolt 211 First connection seat opening part 212 Second connection seat opening part 221 Connection bolt body 222 Head portion 300, 301, 300a, 300b Connection portion 310, 310a, 310b Column portion 311, 312 Space 320 Flange portion 330, 330a, 330b First protrusion portion 331a Bolt portion 332a Nut portion 340 Second protrusion portion 400 , 01, 400a, 400b First sealing member 410, 410b, 530 Plate-like portion 411 First plate-like portion recessed portion 412 Second plate-like portion recessed portion 414 Convex portion 420, 540 Tube-shaped portion 421 Tube-shaped portion opening portion 500, 501 , 500a Second sealing member 510 Second sealing member opening 520 Second sealing member recess

Claims (6)

A container having a hole;
A protruding portion protruding along the container is formed, and a connecting portion penetrating the hole;
A sealing member disposed between the protruding portion and the container, and in contact with the container;
A concave portion is formed in the container,
The concave portion is formed on the inner side of the outer edge portion of the protruding portion when viewed from the direction in which the connecting portion penetrates the hole ,
The protrusion is a caulking portion formed by caulking.
Power storage element.   A container having a hole;
  A protruding portion protruding along the container is formed, and a connecting portion penetrating the hole;
  A sealing member disposed between the protruding portion and the container, and in contact with the container;
  A concave portion is formed in the container,
  The recess is formed in an annular shape so as to be inside the outer edge portion of the projecting portion and to surround the connection portion when viewed from the direction in which the connection portion penetrates the hole.
  Power storage element. The power storage element according to claim 2 , wherein the protruding portion is a caulking portion formed by caulking. The power storage element according to claim 2 , wherein the protrusion is configured by a set of bolts and nuts. The storage element according to claim 1, wherein a part of the sealing member is disposed inside the recess. The recess, the electric storage device according to any one of claim 1 to 5 formed on the outer surface of the container.

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