JP5679272B2 - Battery cover with electrode terminal and sealed battery - Google Patents

Description

  The present invention relates to a battery lid with electrode terminals and a sealed battery.

In a large battery having a capacity exceeding 5 Ah, an electrode sheet (referred to as a positive electrode sheet or a negative electrode sheet) and an external connection terminal are electrically connected via a wiring penetrating an opening provided in the lid of the battery case, A battery that discharges or charges is known (for example, Patent Document 1).
As the lid of the battery case used in the battery having such a structure, a metal lid is usually used. For this reason, an insulating member is provided between the wiring connecting the electrode sheet and the external connection terminal, the external connection terminal, and the lid of the battery case to prevent leakage current from flowing.

JP 2009-283335 A

However, the wiring connecting the electrode sheet and the external connection terminal and the insulating member provided between the external connection terminal and the lid of the battery case strongly torque the external connection terminal to connect the external wiring to the external connection terminal. When it is added or when a vibration or impact is applied to the battery, it may move from a predetermined place where it is installed and cause a leak current to flow.
This invention is made | formed in view of such a situation, and provides the battery cover with an electrode terminal which can prevent that a leak current flows.

  The present invention is a battery lid with electrode terminals for sealing a battery case containing a positive electrode sheet and a negative electrode sheet disposed via a separator and an electrolytic solution, and by processing a part of the lid member A lid member having at least one bottomed cylindrical projection provided and having an outer surface and an inner surface; and disposed on the inner surface side of the lid member for connecting to the positive electrode sheet or the negative electrode sheet An electrode connection terminal having a connection portion, an external connection terminal disposed on the outer surface side of the lid member and electrically connected to the electrode connection terminal, and an inner surface of the lid member and the electrode connection terminal An internal insulating member having a convex portion or a concave portion and an external insulating member having a convex portion or a concave portion disposed between the outer surface of the lid member and the external connection terminal. Bottom cylindrical protrusion Has an opening, a bottom portion, and a cylindrical portion, and the bottomed cylindrical projection engages with the concave portion of the inner insulating member on the outside of the projection, and the outer side on the inner side of the cylindrical portion of the projection. It is engaged with the convex portion of the insulating member, or is engaged with the concave portion of the external insulating member outside the projection, and is engaged with the convex portion of the internal insulating member inside the cylindrical portion of the projection. A battery lid with electrode terminals is provided.

According to the present invention, since the internal insulating member disposed between the inner surface of the lid member and the electrode connection terminal is provided, the inner surface of the lid member and the electrode connection terminal can be electrically insulated. Moreover, since the external insulation member arrange | positioned between the outer surface of a cover member and an external connection terminal is provided, the outer surface of a cover member and an external connection terminal can be electrically insulated. For this reason, it can prevent that a leak current flows between a cover member, an electrode connection terminal, and an external connection terminal.
According to the present invention, since the concave portion or the convex portion of the inner insulating member meshes with the bottomed cylindrical projection of the lid member, the inner insulating member and the lid member can be combined at a predetermined position. It is possible to prevent movement from the position. Further, the concave portion or the convex portion of the external insulating member is engaged with the bottomed cylindrical projection of the lid member. For this reason, an external insulation member and a cover member can be combined in a predetermined position, and it can prevent moving from this predetermined position. By these things, the leakage current which arises when an internal insulation member or an external insulation member moves from a predetermined position can be prevented. Moreover, precipitation of lithium metal on the lid member can be prevented. Furthermore, when manufacturing the battery lid with electrode terminals, the internal insulating member and the external insulating member can be easily positioned, and the manufacturing cost can be reduced.
Also, the bottomed cylindrical projection can be produced by pressing a metal plate, and since one bottomed cylindrical projection can be engaged with both the external insulating member and the internal insulating member, it is manufactured. Cost can be reduced.

It is a schematic top view of the battery cover with an electrode terminal of one embodiment of the present invention. It is a schematic sectional drawing of the battery cover with an electrode terminal in the dotted line AA of FIG. It is a schematic sectional drawing of the battery cover with an electrode terminal in the dotted line BB of FIG. (A) is a schematic plan view of the cover member contained in the battery cover with an electrode terminal of one embodiment of the present invention, (b) is a schematic cross-sectional view of the cover member along the dotted line DD of (a), (C) is a schematic sectional drawing of the cover member in the dashed-dotted line EE of (a). It is an enlarged view of the range P enclosed with the dashed-dotted line of FIG. (A) is a schematic top view before joining with the external connection terminal of the electrode connection terminal contained in the battery cover with an electrode terminal of one Embodiment of this invention, (b) is a schematic side view of an electrode connection terminal. (C) is a schematic sectional drawing of the electrode connection terminal in the dashed-dotted line DD of (a). (A) is a schematic top view of the internal insulation member contained in the battery cover with an electrode terminal of one Embodiment of this invention, (b) is a schematic back view of an internal insulation member, (c) is (a). It is a schematic sectional drawing of the internal insulation member in the dotted line EE of (a), (d) is a schematic sectional drawing of the internal insulation member in the dashed-dotted line FF of (a), (e) is dotted line G of (b). It is a schematic sectional drawing of the internal insulation member in -G. (A) is a schematic plan view before joining with the electrode connection terminal of the external connection terminal contained in the battery cover with an electrode terminal of one Embodiment of this invention, (b) is the dotted line HH of (a). It is a schematic sectional drawing of the external connection terminal in this. (A) is a schematic top view of the external insulation member contained in the battery cover with an electrode terminal of one Embodiment of this invention, (b) is a schematic back view of an external insulation member, (c) is (a). It is a schematic sectional drawing of the external insulation member in the dotted line II of (a), (d) is a schematic sectional drawing of the external insulation member in the dashed-dotted line JJ of (a). FIG. 3 is an enlarged view of a range C surrounded by a dotted line in FIG. 2. It is a schematic sectional drawing of the electrode connection terminal and internal insulation member which are contained in the battery cover with an electrode terminal of one Embodiment of this invention. (A) is a schematic top view of the packing which is a component of the battery cover with an electrode terminal of one Embodiment of this invention, (b) is a schematic sectional drawing of the dotted line KK of (a). It is a schematic plan view of the external wiring for connecting to the external connection terminal contained in the battery cover with an electrode terminal of one Embodiment of this invention. It is a schematic sectional drawing of a part of battery cover with an electrode terminal of one Embodiment of this invention. It is explanatory drawing explaining the manufacturing method of the battery cover with an electrode terminal of one Embodiment of this invention. 1 is a schematic top view of a sealed battery according to an embodiment of the present invention. 1 is a schematic side view of a sealed battery according to an embodiment of the present invention. It is a schematic sectional drawing of the sealed battery in the dotted line LL of FIG. It is a schematic sectional drawing of the sealed battery in the dotted line MM of FIG. (A) is a schematic plan view of the positive electrode sheet contained in the sealed battery of one Embodiment of this invention, (b) is a schematic sectional drawing of the dotted line NN of (a). (A) is a schematic plan view of the negative electrode sheet contained in the sealed battery of one Embodiment of this invention, (b) is a schematic sectional drawing of the dotted line OO of (a).

  A battery lid with an electrode terminal of the present invention is a battery lid with an electrode terminal for sealing a battery case containing a positive electrode sheet and a negative electrode sheet disposed via a separator and an electrolytic solution, and is one of the lid members. A lid member having at least one bottomed cylindrical projection provided by processing the portion and having an outer surface and an inner surface; and the positive electrode sheet or the negative electrode disposed on the inner surface side of the lid member An electrode connection terminal having a connection portion for connection to the sheet; an external connection terminal disposed on the outer surface side of the lid member and electrically connected to the electrode connection terminal; an inner surface of the lid member; and the electrode An internal insulating member disposed between the connection terminal and having a convex portion or a concave portion, and an external insulating member disposed between the outer surface of the lid member and the external connection terminal and having the convex portion or the concave portion. And be prepared The bottomed cylindrical projection has an opening, a bottom portion, and a cylindrical portion, and the bottomed cylindrical projection is engaged with the concave portion of the internal insulating member outside the projection, and Engage with the convex part of the external insulating member inside the cylindrical part, or mesh with the concave part of the external insulating member outside the projection, and convex part of the internal insulating member inside the cylindrical part of the projection It is characterized by biting.

The battery lid with electrode terminals is a lid of a container that accommodates an electrode sheet and an electrolyte that perform a battery reaction, and is connected to an electrode connection terminal for connection to the electrode sheet and external wiring for discharging or charging the battery. A battery lid provided with an external connection terminal.
The sealed battery is a battery having a sealed structure, for example, a lithium ion secondary battery, a nickel / hydrogen secondary battery, a nickel / cadmium secondary battery, or the like.

In the battery lid with electrode terminals of the present invention, the lid member, the internal insulating member, and the external insulating member each have an opening, and a part of the electrode connection terminal is an opening of the lid member, the internal insulating member. It is preferable to penetrate through the opening of the external insulating member and the opening of the external insulating member and join the external connection terminal.
According to such a configuration, the electrode connection terminal and the external connection terminal can be electrically connected. Moreover, the internal resistance of the wiring which electrically connects the electrode sheet and the external connection terminal can be further reduced. Further, the internal insulating member, the lid member and the external insulating member can be sandwiched between the electrode connecting terminal and the external connecting terminal, and the lid member, the electrode connecting terminal, the internal insulating member, the external insulating member and the external connecting terminal are integrated. Can be Furthermore, it is possible to prevent the lid member, the inner insulating member, and the outer insulating member from moving from predetermined positions both in the opening and inside and outside the bottomed cylindrical projection of the lid member.
In the battery lid with an electrode terminal according to the present invention, the electrode connection terminal and the side wall of the opening of the lid member, the side wall of the electrode connection terminal and the opening of the internal insulation member, and the opening of the electrode connection terminal and the external insulation member It is preferable to further include packings sandwiched between the side walls.
According to such a configuration, the electrode connection terminal and the side wall of the opening of the lid member can be electrically insulated, and leakage current can be prevented from flowing. Further, a packing can be disposed between the opening of the lid member and the electrode connection terminal that passes through the opening, and it is possible to prevent a liquid such as an electrolyte from flowing through the opening of the lid member. Can improve the sealing performance. Furthermore, the electrode connection terminal, the internal insulating member, and the external insulating member can be fixed to the lid member by packing.

In the battery lid with electrode terminals of the present invention, it is preferable that the electrode connection terminal is engaged with the internal insulating member, and the external connection terminal is engaged with the external insulating member.
When the electrode connecting terminal and the internal insulating member are engaged, the electrode connecting terminal and the internal insulating member can be combined at a predetermined position, and movement from the predetermined position can be prevented. Further, the external connection terminal and the external insulating member are engaged with each other, so that the external connection terminal and the external insulating member can be combined at a predetermined position, and the movement from the predetermined position can be prevented.
Furthermore, since the electrode connection terminal, the internal insulation member, the lid member, the external insulation member, and the external connection terminal can be combined at a predetermined position, it can be prevented from moving from the predetermined position, and the external connection terminal can be externally connected. Even when a strong torque is applied to the external connection terminal to connect the wiring, the electrode connection terminal and the external connection terminal can be prevented from moving from a predetermined position. For this reason, it is possible to prevent the occurrence of leakage current caused by the movement of the electrode connection terminal or the external connection terminal from a predetermined position, and it is possible to prevent a contact failure between the electrode connection terminal and the electrode sheet. Can be prevented. Further, since it is possible to prevent rotation of the electrode connection terminal and packing in the opening of the lid member, it is possible to prevent liquid such as electrolyte from flowing through the opening of the lid member. It is possible to prevent a decrease in sealing performance.

The battery lid with electrode terminals of the present invention preferably further includes a screw member joined to the external connection terminal.
According to such a configuration, the external connection terminal and the external wiring can be electrically connected by the screw member.
In addition, the present invention includes a positive electrode sheet and a negative electrode sheet disposed via a separator inside a battery case joined to the battery lid with electrode terminals of the present invention, and an electrolyte solution, and the electrode connection terminals and the external connection There are a plurality of terminals, the inner insulating member, and the outer insulating member, the positive electrode sheet is connected to at least one of the electrode connecting terminals, and the negative electrode sheet is a plurality of the electrode connecting terminals. A sealed battery connected to the other electrode connection terminal among the electrode connection terminals is also provided.
According to the sealed battery of the present invention, it is possible to provide a sealed battery that can prevent the internal insulating member and the external insulating member from moving from a predetermined position.
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The configurations shown in the drawings and the following description are merely examples, and the scope of the present invention is not limited to those shown in the drawings and the following description.

With the electrode terminal battery cover Figure 1 is a schematic top view of the electrode terminal with the battery lid of an embodiment of the present invention, FIG. 2 is a schematic cross-sectional view with the electrode terminals battery cover in dotted line A-A of FIG. 1 FIG. 3 is a schematic cross-sectional view of the battery lid with electrode terminals taken along one-dot chain line BB in FIG. FIGS. 4, 6, 7, 8, and 9 are plan views of the lid member, the electrode connection terminal, the internal insulation member, the external connection terminal, and the external insulation member, respectively. 5 is an enlarged view of a range P surrounded by a dashed line in FIG. 4, and FIG. 10 is an enlarged view of a range C surrounded by a dotted line in FIG.

The battery lid 17 with electrode terminals of the present embodiment is a battery lid 17 with electrode terminals for sealing the battery case 1 containing the positive electrode sheet 21 and the negative electrode sheet 22 disposed via the separator 24 and the electrolytic solution. The lid member 2 has at least one bottomed cylindrical projection 9 provided by processing a part of the lid member 2 and has an outer surface and an inner surface, and the inner surface side of the lid member 2 And an electrode connection terminal 5 having a connection portion 16 for connecting to the positive electrode sheet 21 or the negative electrode sheet 22, and an external element disposed on the outer surface side of the lid member 2 and electrically connected to the electrode connection terminal 5. Between the connection terminal 8, the inner surface of the lid member 2 and the electrode connection terminal 5, and having the convex portion 52 or the concave portion, and between the outer surface of the lid member 2 and the external connection terminal 8 And the convex part Includes an external insulating member 10 having a recess 62, the bottomed cylindrical projection 9 has an opening 7 a, a cylindrical portion 7 c, and a bottom portion 7 c, and the bottomed cylindrical projection 9 is the bottom of the projection 9. It is characterized in that it is engaged with the concave portion 62 of the outer insulating member 10 on the outer side, and is engaged with the convex portion 52 of the inner insulating member 11 on the inner side of the cylindrical portion 7b of the protrusion 9.
In the drawing, only the convex portion 52 is drawn on the inner insulating member 11, but the convex portion may be a concave portion, and the concave portion on which only the concave portion 62 is drawn on the outer insulating member 10 may be a convex portion. What is necessary is just to be provided so that the convex part or recessed part of an internal insulating member and the recessed part or convex part of an external insulating member may mesh with the bottomed cylindrical protrusion 9. FIG.
The battery lid with electrode terminals of the present embodiment may further include a packing 13 and a screw member 6.

The battery lid 17 with electrode terminals of the present embodiment may include a plurality of electrode connection terminals 5, external connection terminals 8, internal insulation members 11, external insulation members 10, packings 13, and screw members 6. The terminal 5 includes a positive electrode connection terminal 3 and a negative electrode connection terminal 4, and the plurality of external connection terminals 8 include a positive electrode external connection terminal 8 a and a negative electrode external connection terminal 8 b, and a plurality of internal insulating members 11. Includes a positive electrode internal insulating member 11a and a negative electrode internal insulating member 11b, and the plurality of external insulating members 10 include a positive electrode external insulating member 10a and a negative electrode external insulating member 10b. Includes a positive electrode packing 13a and a negative electrode packing 13b, and the plurality of screw members 6 include a positive electrode screw member 6a and a negative electrode screw member 6b.
The lid member 2 included in the battery lid 17 with electrode terminal of the present embodiment may include a plurality of openings 34, and one of the plurality of openings 34 has a positive electrode connection terminal 3 and a positive electrode internal insulation. The member 11 a, the positive electrode packing 13 a, the positive electrode insulating member 10 a, the positive electrode external insulating member 10 a, and the positive electrode screw member 6 a may be joined together and integrated. The negative electrode connection terminal 3, the negative electrode internal insulating member 11b, the negative electrode packing 13b, the negative electrode insulating member 10b, the negative electrode external insulating member 10b, and the negative electrode screw member 6b may be joined together and integrated.
Below, each component of the battery cover 17 with an electrode terminal of this embodiment is demonstrated.

1. Lid member The lid member 2 has an outer surface and an inner surface, and has a bottomed cylindrical projection 9. Further, the lid member 2 can seal the battery case 1 by being joined to the battery case 1. The lid member 2 can have a plurality of bottomed cylindrical projections 9.
The bottomed cylindrical projection 9 is provided by processing a part of the lid member 2, and has an opening 7a, a cylindrical portion 7b, and a bottom 7c.
The bottomed cylindrical projection 9 may protrude from the outer surface of the lid member 2 as shown in FIG. 4C, or may protrude from the inner surface of the lid member 2. When the bottomed cylindrical projection 9 protrudes from the outer surface of the lid member 2, the bottomed cylindrical projection 9 becomes a convex portion on the outer surface side and becomes a concave portion on the inner surface side. In this case, as shown in FIG. 3, the bottomed cylindrical projection 9 meshes with the concave portion 62 of the external insulating member 10 on the outer side (convex portion), and the inner insulating member 11 on the inner side (concave portion) of the bottomed cylindrical projection 9. It meshes with the convex part 52 of the.
When the bottomed cylindrical projection 9 protrudes from the inner surface of the lid member 2, the bottomed cylindrical projection 9 becomes a concave portion on the outer surface side and becomes a convex portion on the inner surface side. In this case, the bottomed cylindrical projection 9 is engaged with the concave portion of the inner insulating member 11 on the outer side (convex portion), and is engaged with the convex portion of the outer insulating member 10 on the inner side (concave portion) of the bottomed cylindrical projection 9. To do.

Accordingly, the lid member 2 can be combined with both the internal insulating member 11 and the external insulating member 10 at a predetermined position, and the internal insulating member 11 and the external insulating member 10 are prevented from moving from the predetermined position. be able to.
Further, two or more bottomed cylindrical projections 9 are provided on the lid member 2 so that the lid member 2 and the internal insulating member 11 can be combined with the lid member 2 and the external insulating member 10 at two or more locations. It may be provided. This can reliably prevent the inner insulating member 11 and the outer insulating member 10 from moving from predetermined positions.

In the present invention, “bite” refers to a state of being engaged with each other in a state of being engaged with each other, may be in a state of being engaged, or may be in a state where portions having different shapes are engaged. A predetermined gap (play) may be provided between the two portions engaged.
The shape of the bottomed cylindrical projection 9 is cylindrical and is not particularly limited as long as it has a bottom, but may be cylindrical, for example.
Further, the angle X formed by the inner surface of the cylindrical portion 7b of the bottomed cylindrical projection 9 shown in FIG. 5 and the inner surface or outer surface of the lid member 2 is preferably 75 ° to 90 °. When the angle X is smaller than 75 °, it has been observed that when the nut 47 is tightened with a torque of 12 Nm, the external insulating member 10 rides on and rotates. And, if the angle X exceeds 90 °, the moldability is deteriorated such that it is difficult to remove the mold at the time of molding.

  The lid member 2 may have an opening 34 as shown in FIG. 4, and the cylindrical portion 30 of the packing 13 penetrates the opening 34 as shown in FIG. 10, and the rivet of the electrode connection terminal 5 is opened inside the cylindrical portion 30. The part 14 may penetrate. Further, the packing 14 may be in close contact with the side wall of the opening 34 and the rivet portion 14. Thereby, it is possible to prevent a liquid such as an electrolyte from flowing through the opening 34, and to improve the sealing performance of the battery.

The material of the lid member 2 is not particularly limited as long as the lid member 2 and the battery case 1 are not greatly deformed even when the lid member 2 and the battery case 1 are joined. For example, a metal material such as aluminum, aluminum alloy, iron, iron alloy, stainless steel, Examples thereof include materials obtained by plating the metal material with nickel, tin, chromium, zinc or the like.
Although the method of forming the bottomed cylindrical projection 9 is not particularly limited, for example, it can be formed by press-extruding a metal plate.

2. Internal insulating member The internal insulating member 11 is disposed between the inner surface of the lid member 2 and the electrode connection terminal 5. By providing the internal insulating member 11, the electrode connection terminal 5 and the inner surface of the lid member 2 can be electrically insulated.
The internal insulating member 11 has a convex portion 52 or a concave portion. The convex portion 52 or the concave portion is engaged with the bottomed cylindrical projection 9 of the lid member 2. This can prevent the internal insulating member 11 from moving from a predetermined position. Further, the internal insulating member 11 may have a plurality of convex portions 52 or a plurality of concave portions, and mesh with the bottomed cylindrical projection 9 of the lid member 2 at the plurality of convex portions 52 or the plurality of concave portions, respectively. Can do. For example, when the internal insulating member 11 has two convex portions 52 as shown in FIGS. 7A and 7D, the convex portions 52 are formed on the bottomed cylindrical projection 9 of the lid member 2 as shown in FIG. The inner insulating member 11 and the electrode connection terminal 5 can be engaged with each other.

  The internal insulating member 11 may have an opening 33 as shown in FIG. 7A, and the rivet portion 14 of the electrode connection terminal 5 may pass through the opening 33 as shown in FIG. The inner flange portion 31 of the packing 13 may be sandwiched between the portion 14 and the opening 33. Thereby, the internal insulating member 11 can be fixed.

  The internal insulating member 11 may be engaged with the electrode connection terminal 5. The method for engaging the inner insulating member 11 and the electrode connection terminal 5 is not particularly limited. For example, as shown in FIG. 7B, the protruding portion 55 is provided on the inner insulating member 11, and the protruding protruding portion 55 is opposed. The distance c between them and the width a of the base portion 15 of the electrode connection terminal 5 are made substantially the same, and the electrode connection terminal 5 and the internal insulating member 11 are combined as shown in FIG. The opposing side surface and the opposing protruding edge portion 55 of the internal insulating member 11 can be engaged with each other.

Further, as shown in FIGS. 7B and 7C, the internal insulating member 11 is provided with a convex portion 53, and the electrode connecting terminal 5 is provided with an opening 45 into which the convex portion 53 can be inserted. The distance d between the portion 55 and the convex portion 53 and the distance b between one side surface of the base portion 51 of the electrode connection terminal 5 and the opening 45 can be made substantially the same. Thereby, the internal insulating member 11 and the electrode connecting terminal 5 can be combined as shown in FIG. 2, and the electrode connecting terminal 5 and the internal insulating member 11 can be engaged.
Moreover, even if the protrusion 55 provided in the internal insulation member 11 is a convex part provided in the internal insulation member 11, it can be engaged similarly.

Further, the inner insulating member 11 is provided with a recess 61 as shown in FIGS. 7B, 7C, and 7E, and the electrode connecting terminal 5 can be engaged with the recess 61 as shown in FIG. Can be provided. FIG. 11 is a schematic cross-sectional view of the state in which the internal insulating member 11 and the electrode connection terminal 5 are combined, and corresponds to FIGS. 7 (e) and 6 (c). As shown in FIG. 11, the internal insulating member 11 and the electrode connecting terminal 5 can be engaged with each other by combining the internal insulating member 11 and the electrode connecting terminal 5 so that the convex portion 51 enters the concave portion 61. Moreover, a convex part can be provided in the internal insulation member 11, and a concave part can be provided in the electrode connection terminal 5, and it can also be made to engage similarly.
The method of engaging the internal insulating member 11 and the electrode connection terminal 5 can also be applied when the external insulating member 10 and the external connection terminal 8 are engaged.

  The material of the internal insulating member 11 is not particularly limited as long as the electrode connecting terminal 5 and the lid member 2 can be electrically insulated. For example, polyphenylene sulfide resin (PPS) or hard polypropylene (hard PP) is used.

3. External Insulating Member The external insulating member 10 is disposed between the outer surface of the lid member 2 and the external connection terminal 8. By providing the external insulating member 10, the external connection terminal 8 and the outer surface of the lid member 2 can be electrically insulated.
The external insulating member 10 has a convex portion or a concave portion 62. The convex portion or the concave portion 62 is engaged with the bottomed cylindrical projection 9 of the lid member 2. This can prevent the external insulating member 10 from moving from a predetermined position. Further, the external insulating member 10 may have a plurality of convex portions or a plurality of concave portions 62, and is engaged with the bottomed cylindrical projection 9 of the lid member 2 by the plurality of convex portions or the plurality of concave portions 62. Can do. For example, when the external insulating member 10 has two recesses 62 as shown in FIGS. 9B and 9D, the bottomed cylindrical projection 9 of the lid member 2 is inserted into the recess 62 as shown in FIG. The external insulating member 10 and the lid member 2 can be engaged with each other.

  The external insulating member 10 may have an opening 35 as shown in FIG. 9A, and the rivet portion 14 of the electrode connection terminal 5 may pass through the opening 35 as shown in FIG. The outer flange portion 43 of the packing 13 may be sandwiched between the portion 14 and the opening 35. Thereby, the external insulating member 10 can be fixed.

  The external insulating member 10 may be engaged with the external connection terminal 8. The method of engaging the external insulating member 10 and the external connection terminal 8 is not particularly limited. For example, as shown in FIGS. 9A and 9C, the external insulating member 10 is provided with a protruding portion 56, and the protruding protruding edges are opposed to each other. The distance g between the portions 56 and the width e of the external connection terminal 8 are made substantially the same, or the distance h between the projecting edges 56 and the length f of the external connection terminal 8 are made substantially the same, The external connection terminal 8 and the external insulating member 10 can be combined and engaged. Further, as shown in FIGS. 8 and 9, the inner shape of a part of the protruding portion 56 of the external insulating member 10 and the shape of a part of the external connection terminal 8 are made substantially the same, so that the occlusion is achieved. It can also be made. Moreover, a convex part may be provided in either one of the external insulating member 10 and the external connection terminal 8, a concave part may be provided in the other, and this convex part and a recessed part may be engaged.

  The material of the external insulating member 10 is not particularly limited as long as the external connection terminal 8 and the lid member 2 can be electrically insulated. For example, polyphenylene sulfide resin (PPS) or hard polypropylene (hard PP) is used.

4). Electrode Connection Terminal The electrode connection terminal 5 is disposed on the inner surface side of the lid member 2 and has a connection portion 16 for connection to the positive electrode sheet 21 or the negative electrode sheet 22. In addition, the electrode connection terminal 5 can have a base 15 disposed on the inner surface side of the lid member 2 and a rivet portion 14 that protrudes from the base 15 and is joined to the external connection terminal 8. Further, the base portion 15 can have a shape that can be engaged with the internal insulating member 11, and can have an opening 45, a convex portion 51, and a concave portion for engaging with the internal insulating member 11.

The electrode connection terminals 5 may be plural, and the plurality of electrode connection terminals 5 include the positive electrode connection terminal 3 and the negative electrode connection terminal 4. The positive electrode connection terminal 3 can be connected to the positive electrode sheet 21 at the connection portion 16, and the rivet portion 14 is joined to the positive electrode external connection terminal 8 a. The negative electrode connection terminal 4 can be connected to the negative electrode sheet 22 at the connection portion 16, and the rivet portion 14 can be joined to the negative electrode external connection terminal 8b.
Although the material of the positive electrode connection terminal 3 and the negative electrode connection terminal 4 is not specifically limited, For example, the positive electrode connection terminal 3 can be made from aluminum, for example, and the negative electrode connection terminal 4 can be made from copper, for example.
Although the manufacturing method of the electrode connection terminal 5 is not specifically limited, For example, it can manufacture by pressing a metal plate.

The electrode connection terminal 5 has, for example, a structure as shown in FIGS. 2 and 10, and one surface of the flat base portion 15 is in surface contact with the internal insulating member 11 and the internal flange portion 31 of the packing 13. The rivet portion 14 protruding from the base portion 15 penetrates the opening 29 of the packing 13, the opening 33 of the internal insulating member 11, the opening 34 of the lid member 2, the opening 35 of the external insulating member 10, and the opening 36 of the external connection terminal 8. Then, the external connection terminal 8 is joined.
The electrode connection terminal 5 can have a structure as shown in FIGS. 6A to 6C before being joined to the external connection terminal 8. Moreover, the connection part 16 of the electrode connection terminal 5 can have a U-shaped structure as shown in FIG. 6, and the electrode sheet 18 can be joined to each of the two outer surfaces of the opposing metal plates. .

5. External Connection Terminal The external connection terminal 8 is disposed on the outer surface side of the lid member 2 and is electrically connected to the electrode connection terminal 5. The external connection terminal 8 can be connected to external wiring, and the external connection terminal 8 is provided so that the battery can be discharged or charged.
The external connection terminal 8 may have an opening 36 through which the rivet portion 14 of the electrode connection terminal 5 passes, and may be joined to the rivet portion 14 by caulking the end of the rivet portion 14. The external connection terminal 8 may have an opening 37 through which the screw member 6 passes, and can be joined to the screw member 6. Further, the external connection terminal 8 may have an external connection portion 38 around the opening 37. By having the external connection part 38, the external connection terminal 8 and external wiring can be connected.
Further, the external connection terminal 8 can be joined to the screw member 6.
Although the material of the external connection terminal 8 will not be specifically limited if it is a metal plate used as the terminal connected with external wiring, For example, it is an aluminum plate.

  FIG. 8A is a schematic plan view of the external connection terminal 8 before the rivet portion 14 of the electrode connection terminal 5 and the screw member 6 are joined, and FIG. 8B is a dotted line H− in FIG. It is a schematic sectional drawing of the external connection terminal 8 in H. As shown in FIG. 8, the external connection terminal 8 includes a flat plate portion around the opening 36 through which the rivet portion 14 of the electrode connection terminal 5 passes, and a flat plate around the opening 37 which is the external connection portion 38 and through which the screw member 6 passes. You may have a part so that height may differ. At this time, the external flange portion 43 can be directly sandwiched between the flat plate portion around the opening 36 and the outer surface of the lid member 2.

6). Packing Packing 13 is sandwiched between the electrode connection terminal 5 and the opening side wall of the lid member 2, the electrode connection terminal 5 and the opening side wall of the internal insulating member 11, and the electrode connection terminal 5 and the side wall of the opening of the external insulating member 10. The For example, as shown in FIG. 10, the packing 13 penetrates the opening 34 of the lid member 2 and is in close contact with the side wall of the opening 34 of the lid member 2, the base 15 of the electrode connection terminal 5, and the lid member. 2 has an internal flange portion 31 directly sandwiched between the inner surface and the external flange portion 43 directly sandwiched between the external connection terminal 8 and the outer surface of the lid member 2. Accordingly, a packing can be sandwiched between the electrode connection terminal 5 and the lid member 2, and a liquid such as an electrolytic solution can be prevented from flowing in the gap between the electrode connection terminal 5 and the lid member 2. Can do.
Further, the rivet portion 14 of the electrode connection terminal 5 passes through the opening 29 inside the packing 13, and the rivet portion 14 and the side wall of the opening 29 can be in close contact with each other.

  The inner flange portion 31 can be provided in the opening 33 of the inner insulating member 11, and the outer flange portion 43 can be provided in the opening 35 of the outer insulating member 10. Further, the internal flange portion 31 can be provided so as to be in close contact with the side wall of the opening 33 of the internal insulating member 11, and the external flange portion 43 is provided so as to be in close contact with the side wall of the opening 35 of the external insulating member 10. it can. Thereby, the inner insulating member 11 and the outer insulating member 10 can be fixed. Further, it is possible to prevent the inner insulating member 11 and the outer insulating member 10 from moving from predetermined positions.

  The material of the packing 13 can be disposed between the electrode connection terminal 5 and the lid member 2 and can prevent the flow of a liquid such as an electrolytic solution. The end of the rivet portion 14 is caulked. The material is not particularly limited as long as the material is soft enough to be deformed. Preferably, the organic solvent resistance is better. For example, it is a fluororesin, preferably PFA or FEP. Moreover, it is preferable that the packing 13 has electrical insulation.

  12A is a schematic top view of the packing 13 before the packing 13 is deformed before the rivet portion 14 of the electrode connection terminal 5 is joined to the external connection terminal 8, and FIG. It is a schematic sectional drawing of the packing 13 in the dotted line KK of Fig.12 (a). The unpacked packing 13 has a cylindrical portion 30 and an internal flange portion 31 around the opening 29.

7). Screw member The screw member 6 can pass through the opening 37 of the external connection terminal 8 and be joined to the external connection terminal 8. The screw member 6 may have a male screw structure.
FIG. 13 is a schematic plan view of a metal plate that forms the external wiring 45 connected to the external connection terminal 8. FIG. 14 is a schematic cross-sectional view of the battery lid 17 with electrode terminals when a metal plate serving as the external wiring 45 is connected to the external connection terminals 8. FIG. 14 corresponds to FIG. When the screw member 6 has a male screw structure as shown in FIG. 14, an external connection terminal is formed by passing the male plate structure of the screw member 6 through the opening 46 of the metal plate serving as the external wiring 45 and fastening the male screw with a nut 47 or the like. 8 and the external wiring 45 can be connected.
Moreover, the screw member 6 may have a female screw structure. In this case, the external connection terminal 8 and the external wiring 45 can be connected by fastening the female screw structure with a bolt or the like.

  By connecting the external connection terminal 8 and the external wiring 45 with the screw member 6, the external connection terminal 8 and the external wiring 45 can be brought into close contact with each other. When the screw member 6 and the nut 47 or the bolt are tightened, it is necessary to apply a force (torque) to be tightened on the nut 47 or the bolt. When the position of the external connection terminal 8 or the electrode connection terminal 5 is moved by this torque, it may cause a leak current to flow. In addition, when the torque causes the rivet portion 14 of the electrode connection terminal 5 to rotate relative to the packing 13 or the packing 13 rotates relative to the side surface of the opening 34 of the lid member 2, the opening 34 and the packing 13 In some cases, a liquid such as an electrolyte may flow between the packing 13 and the rivet portion 14, and the sealing performance of the battery may deteriorate.

  However, when the external connection terminal 8 is engaged with the external insulation member 10, the external insulation member 10 is engaged with the lid member 2, the internal insulation member 11 is engaged, and the electrode connection terminal 5 is engaged with the internal insulation member 11. Even if a torque is applied to the nut 47 or the bolt fastened to the screw member 6 in order to bring the external connection terminal 8 and the external wiring 45 into close contact, the external connection terminal 8 or the electrode connection terminal 5 moves or the electrode connection terminal 5 It is possible to prevent the rivet portion 14 from rotating with respect to the packing 13 and the packing 13 from rotating with respect to the side surface of the opening 34 of the lid member 2. As a result, it is possible to prevent the occurrence of leakage current and the deterioration of the sealing performance of the battery.

  The method for joining the screw member 6 to the external connection terminal 8 is not particularly limited. For example, the screw member 6 can be joined by passing through the opening 37 of the external connection terminal 8 and caulking the end of the screw member. .

8). Manufacturing Method of Battery Lid with Electrode Terminal The battery lid with electrode terminal 17 of the present embodiment includes an opening 29 inside the cylindrical portion 30 of the packing 13 having an internal flange portion 31 and a cylindrical portion 30, and an opening 33 of the internal insulating member 11. And the opening 34 of the lid member 2, the opening 35 of the external insulating member 10, and the opening 36 of the external connection terminal 8, and the rivet portion 14 of the electrode connection terminal 5 having the base portion 15 and the rivet portion 14 protruding from the base portion 15. A step of caulking the end of the rivet portion 14 in a state where the rivet portion 14 is penetrated. In the step of caulking the end of the rivet portion 14, the rivet portion 14 is joined to the external connection terminal 8, and It can be manufactured by the manufacturing method of the battery lid with electrode terminal 17 in which the end portion of the cylindrical portion 30 is deformed by press-contacting to the end of the electrode portion and the external flange portion 43 is formed.

  FIG. 15 is an explanatory diagram for explaining a method of manufacturing the battery lid 17 with electrode terminals of the present embodiment. FIG. 15 is a stage before the rivet portion 14 of the electrode connection terminal 5 is joined to the external connection terminal 8. The rivet portion 14 includes the opening 29 of the packing 13, the opening 33 of the internal insulating member 5, and the lid member. 2 is a schematic cross-sectional view of a state of passing through two openings 34, an opening 35 of the external insulating member 10, and an opening 36 of the external connection terminal 8, and corresponds to FIG. Further, FIG. 15 also shows a mold 40 and a pressing member 41 used for caulking the end of the rivet portion 14. In the state as shown in FIG. 15, the rivet portion 14 is deformed by the step of caulking the end of the rivet portion 14 of the electrode connection terminal 5 using the mold 40 and the pressing member 41, and the rivet portion 14 and the outside The connection terminal 8 can be joined. Further, by crimping the end of the rivet portion 14, the packing 13, the internal insulating member 11, the lid member 2 and the external insulating member 10 can be sandwiched between the electrode connecting terminal 5 and the external connecting terminal 8 and fixed. be able to.

  Further, the outer diameter of the rivet portion 14 (distance i shown in FIG. 15), the diameter of the opening 29 of the packing 13 (distance i shown in FIG. 15), and the diameter of the opening 36 of the external connection terminal 8 (shown in FIG. 15). The distance i) may be substantially the same. In this case, the outer periphery of the rivet portion 14 and the side wall of the opening 29 inside the packing 13 can be brought into close contact with each other by performing a step of crimping the end of the rivet portion 14. In addition, the bonding area between the electrode connection terminal 5 and the external connection terminal 8 can be increased. Further, when crimping the end of the rivet portion 14, the external connection terminal 8 can be pressed against the end of the cylindrical portion 30 of the packing 13, the cylindrical portion 30 can be deformed, and the external flange portion 43 is formed. Can do.

  The outer diameter of the cylindrical portion 30 (distance j shown in FIG. 15) may be substantially the same as the diameter of the opening 34 of the lid member 2 (distance j shown in FIG. 15). In this case, the outer peripheral surface of the packing 13 and the side surface of the opening 34 of the lid member 2 can be brought into close contact with each other by performing a step of crimping the end of the rivet portion 14.

  The thickness of the internal flange portion 31 of the packing 13 (distance q shown in FIG. 15) is larger than the thickness of the internal insulating member 11 (distance s shown in FIG. 15), and the outer flange portion 31 of the packing 13 The diameter (distance m shown in FIG. 15) may be smaller than the diameter of the opening 33 of the internal insulating member 11 (distance n shown in FIG. 15). In this case, by performing the step of caulking the end of the rivet portion 14, the internal flange portion 31 can be compressed and deformed by the base portion 15 of the electrode connection terminal 5 and the back surface of the lid member 2, and the internal flange portion 31 can be The connection terminal 5 and the back surface of the lid member 2 can be brought into close contact with each other. Further, the inner flange portion 31 can be compressed and deformed so that the side wall is in close contact with the side wall of the opening 33 of the inner insulating member 11, and the inner insulating member 11 can be fixed.

  The length of the cylindrical portion 30 of the packing 13 (distance p shown in FIG. 15) is longer than the sum of the thickness of the lid member 2 and the thickness of the external insulating member 10 (distance r shown in FIG. 15). The outer diameter of the cylindrical portion 30 (distance j shown in FIG. 15) may be smaller than the diameter of the opening 35 of the external insulating member 10 (distance k shown in FIG. 15). In this case, by performing a step of caulking the end of the rivet portion 14, the external connection terminal 8 comes into pressure contact with the end of the cylindrical portion 30 of the packing 13, compresses and deforms the end portion of the cylindrical portion 30, and Can be formed. Further, the external flange portion 43 can be brought into close contact with the outer surface of the lid member 2 and the external connection terminal 8. The external flange portion 43 can be formed so that the side wall is in close contact with the side wall of the opening 35 of the external insulating member 10, and the external insulating member 10 can be fixed.

  By adopting the method for manufacturing the battery lid 17 with electrode terminals as described above, when the packing 13 having the cylindrical portion 30, the inner flange portion 31, and the outer flange portion 43 is attached to the lid member 2, the injection molding is performed. It is not necessary to form a packing on the lid member in advance, etc., and the packing 13 can be attached to the lid member 2 at the same time that the terminal and the lid member 2 are integrated, thereby improving the assemblability in the manufacturing process. It becomes possible.

Sealed battery 16 is a schematic top view of a sealed battery according to one embodiment of the present invention, FIG 17 is a schematic side view of a sealed battery according to one embodiment of the present invention. 18 is a schematic cross-sectional view of the sealed battery taken along a dotted line LL in FIG. 16, and FIG. 19 is a schematic cross-sectional view of the sealed battery taken along a dotted line MM in FIG.
The sealed battery 20 of the present embodiment includes a separator 24, a positive electrode sheet 21 and a negative electrode sheet 22 disposed via the separator 24, and an electrolyte solution in the battery case 1 joined to the battery lid 17 with electrode terminals. The electrode connection terminal 5, the packing 13, the internal insulation member 11, the external insulation member 10, and the external connection terminal 8 are plural, and the positive electrode sheet 21 is connected to at least one of the multiple electrode connection terminals 5. Connected to the terminal 5, the negative electrode sheet 22 is connected to the other electrode connection terminal 5 among the plurality of electrode connection terminals 5.

The sealed battery 20 of the present embodiment has a power generation element 12 joined to an electrode connection terminal 5 included in a battery lid 17 with electrode terminals, and the power generation element 12 is accommodated inside the battery case 1 and the battery case 1 is opened. The lid member 2 is fitted to the battery case 1, the battery case 1 and the lid member 2 are joined, and the electrolytic solution is injected into the battery case 1.
Hereinafter, components other than the battery lid 17 with electrode terminals of the sealed battery of the present embodiment will be described.

1. Power Generation Element The power generation element 12 performs a battery reaction with the electrolyte filled in the battery case 1. The sealed battery 20 can be discharged and charged by this battery reaction. The power generation element 12 includes a separator 24, and a positive electrode sheet 21 and a negative electrode sheet 22 disposed via the separator 24. For example, as shown in FIG. 19, the power generation element 12 is arranged in the bellows-folded separator 24, and the positive electrode sheet 21 and the negative electrode sheet 22 that are arranged in each valley groove of the separator 24 and alternately arranged via the separator 24. With.

  The separator 24 has a sheet shape and is disposed between the positive electrode sheet 21 and the negative electrode sheet 22. The separator 24 is not particularly limited as long as it can prevent a short-circuit current from flowing between the positive electrode sheet 21 and the negative electrode sheet 22 and can permeate the electrolyte. For example, a microporous film of polyolefin is used. be able to.

  The positive electrode sheet 21 includes a positive electrode current collector 27 and a positive electrode active material layer 25 provided on both surfaces of the positive electrode current collector 27. The positive electrode sheet 21 can be formed, for example, as shown in FIGS. 20A and 20B, and can be formed by forming the positive electrode active material layers 25 on both surfaces of the rectangular positive electrode current collector 27. And the positive electrode sheet 21 can have the connection part 23 for connecting to the connection part 16 of the positive electrode connection terminal 3, and the connection part 23 of Fig.20 (a) is the positive electrode current collection of the edge part of the positive electrode sheet 21 The positive electrode active material layer 25 can be provided on both surfaces of the body 27 by not forming it. Alternatively, the connection portion can be provided by forming an ear at one end of the positive electrode current collector 27 and not forming the positive electrode active material layer 25 at the end.

The positive electrode current collector 27 is not particularly limited as long as it has electrical conductivity and can have the positive electrode active material layer 25 on the surface. For example, the positive electrode current collector 27 is a metal foil. Aluminum foil is preferable.
The positive electrode active material layer 25 can be formed on the positive electrode current collector 27 by a coating method or the like by adding a conductive agent, a binder, or the like to the positive electrode active material. For example, in the case of a lithium secondary battery, the positive electrode active material is LiCoO ₂ , LiNiO ₂ , LiMn ₂ O ₄ or LiFePO ₄ .

  The negative electrode sheet 22 includes a negative electrode current collector 28 and a negative electrode active material layer 26 provided on both surfaces of the negative electrode current collector 28. The negative electrode sheet 22 can be formed, for example, as shown in FIGS. 21A and 21B, and can be formed by forming the negative electrode active material layers 26 on both sides of the rectangular negative electrode current collector 28. And the negative electrode sheet 22 can have the connection part 23 for connecting to the negative electrode connection terminal 4, and the connection part 23 of Fig.21 (a) is both surfaces of the negative electrode collector 27 of the edge part of the negative electrode sheet 22. FIG. It can be provided by not forming the negative electrode active material layer 26 thereon. Alternatively, the connection portion can be provided by forming an ear at one end of the negative electrode current collector and not forming the negative electrode active material layer 26 at the ear.

Although it will not specifically limit if the negative electrode collector 28 has electrical conductivity and can provide the negative electrode active material layer 26 on the surface, For example, it is metal foil. Copper foil is preferred.
The negative electrode active material layer 26 can be formed on the negative electrode current collector 28 by adding a conductive agent, a binder, or the like to the negative electrode active material, and applying a coating method or the like. For example, in the case of a lithium secondary battery, the negative electrode active material is graphite, partially graphitized carbon, LiTiO ₄ , Sn alloy, or the like.

2. Battery Case The battery case 1 is a battery case that accommodates the power generation element 12, the positive electrode connection terminal 3, the negative electrode connection terminal 4, and the electrolyte therein, and is not particularly limited as long as it is joined to the lid member 2.
The material of the battery case 1 is not particularly limited as long as it is a material that does not greatly deform even if the power generation element 12, the positive electrode connection terminal 3, the negative electrode connection terminal 4, and the electrolytic solution are accommodated therein. And metal materials such as iron alloys and stainless steel, nickel, tin, chromium, zinc and the like plated on the metal materials, and hard plastics.
A method for joining the lid member 2 and the battery case 1 is not particularly limited, and for example, joining by laser welding, resistance welding, ultrasonic welding, adhesive, or the like.

3. Electrolytic Solution The electrolytic solution is not particularly limited as long as the power generation element 12 is immersed and the electrolyte is dissolved in a solvent. For example, the electrolytic solution is an organic electrolytic solution, such as LiCF ₃ SO ₃ , LiAsF ₆ , LiClO ₄ , This is a solution in which a lithium salt solute such as LiBF ₄ , LiPF ₆ , LiBOB or the like is dissolved in an organic solvent. Moreover, you may mix | blend additives, such as VC (vinylene carbonate), as needed.

  1: Battery case 2: Lid member 3: Positive electrode connection terminal 4: Negative electrode connection terminal 5: Electrode connection terminal 6, 6a, 6b: Screw member 7a: Opening portion 7b: Cylindrical portion 7c: Bottom portion 8, 8a, 8b: External Connection terminal 9: Bottomed cylindrical projection 10, 10a, 10b: External insulation member 11, 11a, 11b: Internal insulation member 12: Power generation element 13, 13a, 13b: Packing 14: Rivet part 15: Base part 16: Connection part 17: Battery cover with electrode terminal 18: Electrode sheet 20: Sealed battery 21: Positive electrode sheet 22: Negative electrode sheet 23: Connection part 24: Separator 25: Positive electrode active material layer 26: Negative electrode active material layer 27: Positive electrode current collector 28 : Negative electrode current collector 29, 33, 34, 35, 36, 37, 45, 46: Opening 30: Cylindrical part 31: Inside Flange part 38: External connection part 40: Mold 41: Pressing member 43: External flange part 45: External wiring 47: Nut 51, 52: Projection part 55, 56: Projection edge part 61, 62: Concave part

Claims (7)

A battery lid with electrode terminals for sealing a battery case containing a positive electrode sheet and a negative electrode sheet disposed via a separator and an electrolyte solution,
A lid member having at least one bottomed cylindrical projection provided by processing a part of the lid member and having an outer surface and an inner surface; and the positive electrode disposed on the inner surface side of the lid member An electrode connection terminal having a connection part for connecting to the sheet or the negative electrode sheet, an external connection terminal disposed on the outer surface side of the lid member and electrically connected to the electrode connection terminal, and the lid member An inner insulating member disposed between an inner surface and the electrode connection terminal and having a convex portion or a concave portion; and an inner insulating member disposed between the outer surface of the lid member and the external connection terminal; and the convex portion or the concave portion. An external insulating member having
The bottomed cylindrical projection has an opening, a bottom, and a cylindrical portion,
The bottomed cylindrical projection is engaged with the concave portion of the inner insulating member on the outer side of the projection, and is engaged with the convex portion of the outer insulating member on the inner side of the cylindrical portion of the projection, or on the outer side of the projection. Engage with the concave portion of the outer insulating member, and engage with the convex portion of the inner insulating member inside the cylindrical portion of the protrusion ,
The lid member, the internal insulating member, and the external insulating member each have an opening,
A part of the electrode connection terminal passes through the opening of the lid member, the opening of the internal insulating member, and the opening of the external insulating member, and is joined to the external connection terminal . The electrode connection terminal and the side wall of the opening of the lid member, the electrode connection terminal and the side wall of the opening of the internal insulation member, and the packing sandwiched between the electrode connection terminal and the side wall of the opening of the external insulation member are further provided. The battery lid according to claim 1 . The packing passes through the opening of the lid member and is in close contact with the side wall of the opening of the lid member, and an internal flange portion directly sandwiched between the electrode connection terminal and the inner surface of the lid member, An external flange portion directly sandwiched between the external connection terminal and the outer surface of the lid member;
The battery cover according to claim 2, wherein the internal flange portion is provided in an opening of the internal insulating member, and the external flange portion is provided in an opening of the external insulating member. The electrode connection terminal is engaged with the internal insulating member,
The battery cover according to claim 1, wherein the external connection terminal is engaged with the external insulating member. The lid member has at least two bottomed cylindrical projections,
The internal insulating member has a plurality of convex portions or concave portions,
The external insulating member has a plurality of convex portions or concave portions,
Each of the at least two bottomed cylindrical projections meshes with the concave portion of the inner insulating member outside the projection, and meshes with the convex portion of the outer insulating member inside the cylindrical portion of the projection, or The battery lid according to any one of claims 1 to 4, wherein the battery lid is engaged with the concave portion of the external insulating member outside the protrusion and is engaged with the convex portion of the internal insulating member inside the cylindrical portion of the protrusion. A screw member joined to the external connection terminal ;
The battery lid according to claim 5 , wherein the opening of the lid member and at least two of the bottomed cylindrical projections are arranged around the screw member . A positive electrode sheet and a negative electrode sheet arranged via a separator inside the battery case joined to the battery lid according to any one of claims 1 to 6 , and an electrolyte solution,
The electrode connection terminal, the external connection terminal, the internal insulation member and the external insulation member are each a plurality,
The positive electrode sheet is connected to at least one of the plurality of electrode connection terminals, and the negative electrode sheet is connected to the other electrode connection terminal among the plurality of electrode connection terminals.

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