JPWO2017154079A1 - Battery cover with terminal and sealed battery - Google Patents

Abstract

  A battery lid with a terminal, wherein the lid member, a first external connection terminal arranged on the outside of the lid member, and at least a part thereof are arranged on the inside of the lid member and are electrically connected to the first external connection terminal. A first electrode connecting terminal; and a first external insulating member disposed between the lid member and the first external connecting terminal and engaged with the first external connecting terminal. The lid member includes a first opening and a lid. And a first external connection terminal, a first external insulation member, and a first electrode connection terminal, the first external connection terminal and the first electrode connection terminal being around the first opening. The first external insulating member has a second opening through which the first convex portion penetrates, and the first convex portion is the first external portion. A first outer insulating portion having a head larger than the second opening on the outside of the insulating member, and having a caulking structure The fixed to the lid member.

Description

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

The sealed battery has a sealed structure in order to prevent electrolyte leakage and to prevent moisture from entering the battery case from the atmosphere. Moreover, the sealed battery has a structure in which an external connection terminal outside the battery case and a positive electrode or a negative electrode inside the battery case are electrically connected in a state where the airtightness inside the battery case is maintained. For example, a sealed battery in which an external connection terminal and a positive electrode or a negative electrode are electrically connected by a caulking structure in which a rivet is penetrated through a through hole of a sealing lid is known (for example, see Patent Document 1). In this battery, the sealing lid and the external connection terminal are electrically insulated from each other by an insulator between the external connection terminal and the sealing lid. Furthermore, the external connection terminal and the insulator are fixed to the sealing lid by a caulking structure.
On the other hand, in the power storage device, an assembled battery in which external connection terminals of a plurality of sealed batteries are connected by a bus bar or a cable is used to increase the output voltage. A bolt tightening structure is generally used for connection between the external connection terminal and the bus bar or cable.

JP 2014-154292 A

However, in the conventional battery, when the external connection terminal and the bus bar or the cable are connected by the bolt tightening structure, the external connection terminal may be deformed by the screw tightening torque. In addition, when a force for pulling a bus bar or cable connected to the external connection terminal upward is applied, the external connection terminal may be deformed. When the external connection terminal is deformed, it becomes difficult to form an assembled battery with the battery. In addition, the external connection terminal and the sealing lid come into contact with each other, which may cause a short circuit.
This invention is made | formed in view of such a situation, and provides the battery cover with a terminal which can suppress the deformation | transformation of the external connection terminal by screwing torque or tension | pulling.

  The present invention is a battery lid with a terminal for sealing a battery case containing a positive electrode sheet, a negative electrode sheet, a separator, and an electrolyte, and the battery lid is formed on a lid member and outside the lid member. A first external connection terminal disposed; a first electrode connection terminal disposed at least partially inside the lid member and electrically connected to the first external connection terminal; the lid member and the first external connection terminal; And a first external insulating member that engages with the first external connection terminal, and the lid member includes a first opening and a first convex portion that protrudes outside the lid member. The first external connection terminal, the first external insulation member, and the first electrode connection terminal are sandwiched between the first external connection terminal and the first electrode connection terminal around the first opening. A first external insulating portion fixed to the lid member by a structure; Has a second opening through which the first convex portion passes, and the first convex portion has a head portion larger than the second opening on the outside of the first external insulating member, and the first external insulating member has a caulking structure. Is fixed to the lid member, and a battery lid with a terminal is provided.

The battery lid with a terminal of the present invention includes a first external connection terminal disposed on the outside of the lid member, and a first electrode at least partially disposed on the inside of the lid member and electrically connected to the first external connection terminal. Since the connection terminal is provided, the positive electrode sheet or the negative electrode sheet inside the battery can be connected to the first electrode connection terminal, and the positive electrode sheet or the negative electrode sheet and the first external connection terminal outside the battery are electrically connected. Can do. This allows the battery to be discharged or charged.
Since the battery lid with a terminal of the present invention includes the first external insulating member disposed between the lid member and the first external connection terminal, the lid member and the first external connection terminal can be electrically insulated. It is possible to suppress the occurrence of an electrical short circuit.

The lid member includes a first opening, and the first external connection terminal, the first external insulating member, and the first electrode connection terminal are configured such that the first external connection terminal and the first electrode connection terminal are disposed around the first opening. 1 It is fixed to the lid member by a structure that sandwiches the external insulating member (first fixing portion). In addition, the lid member includes a first convex portion that protrudes to the outside of the lid member, the first external insulating member has a second opening through which the first convex portion passes, and the first convex portion is the first external insulating member. The first external insulating member is fixed to the lid member by a caulking structure having a head portion larger than the second opening on the outside (second fixing portion). Therefore, the first external insulating member can be fixed to the lid member at both the first fixing portion and the second fixing portion. Thereby, even when a force is applied to the first external insulating member, it is possible to suppress the first external insulating member from moving with respect to the lid member.
Since the first external connection terminal engages with the first external insulation member, even when a force is applied to the first external insulation member, the first external connection terminal is located at both the engagement portion and the first fixing portion. It is possible to suppress the connection terminal from moving relative to the first external insulating member. Accordingly, since it is possible to suppress the movement of both the first external insulating member and the first external connection terminal with respect to the lid member, when the screw tightening torque is applied to the first external connection terminal or when the first external connection terminal is a bus bar. Even when pulled by a cable or a cable, the first external connection terminal can be prevented from being deformed.

It is a schematic top view of the battery cover with a terminal of one Embodiment of this invention. It is a schematic sectional drawing of the battery cover with a terminal in broken line AA of FIG. (A) is an expanded sectional view of the battery cover with a terminal in the range B enclosed by the broken line of FIG. 2, (b) is an expanded sectional view of the battery cover with a terminal in the range C surrounded by the broken line of FIG. (A) is an expanded sectional view of the battery cover with a terminal in the range D enclosed by the broken line of FIG. 2, (b) is an expanded sectional view of the battery cover with a terminal in the range E enclosed by the broken line of FIG. (A) is a schematic top view of the external connection terminal contained in the battery cover with a terminal of one Embodiment of this invention, (b) is a schematic side view of an external connection terminal, (c) is (a). It is a schematic sectional drawing of the external connection terminal in the broken line DD, (d) is a schematic sectional drawing of the external connection terminal in the dashed-dotted line EE in (a). (A) is a schematic top view of the external insulation member contained in the battery cover with a terminal of one Embodiment of this invention, (b) is a schematic sectional drawing of the external insulation member in the broken line HH of (a). FIG. 5C is a schematic cross-sectional view of the external connection terminal and the external insulating member taken along the broken line FF in FIG. 5A and the broken line JJ in FIG. 6A, and FIG. FIG. 5A is a schematic cross-sectional view of the external connection terminal and the external insulating member taken along one-dot chain line GG of FIG. 5A and one-dot chain line KK of FIG. 6A, and FIG. It is a schematic sectional drawing of the external connection terminal and external insulation member in the dashed-dotted line LL of EE and Fig.6 (a). (A) is a schematic top view of the cover member contained in the battery cover with a terminal of one Embodiment of this invention, (b) is a schematic sectional drawing of the cover member in the broken line RR of (a). (A) is a schematic top view of the sealed battery of one Embodiment of this invention, (b) is a schematic side view of a sealed battery, (c) is the sealed type in the broken line MM of (a). It is a schematic sectional drawing of a battery. (A) is a schematic sectional drawing of the sealed battery in the dashed-dotted line NN of FIG. 8 (a), (b) is a schematic plan view of the positive electrode sheet | seat contained in a sealed battery, (c) is It is a schematic plan view of the negative electrode sheet contained in a sealed battery, (d) is a schematic sectional drawing of the positive electrode sheet in broken line PP of (b), (e) is in broken line QQ of (c). It is a schematic sectional drawing of a negative electrode sheet. It is a schematic top view of the assembled battery which combined multiple sealed batteries of one Embodiment of this invention.

  The battery lid with terminals of the present invention is a battery lid with terminals for sealing a battery case containing a positive electrode sheet, a negative electrode sheet, a separator, and an electrolyte, and the battery lid includes a lid member, A first external connection terminal disposed outside the lid member; a first electrode connection terminal disposed at least partially inside the lid member and electrically connected to the first external connection terminal; and the lid member; A first external insulation member disposed between the first external connection terminal and engaged with the first external connection terminal, wherein the lid member projects to the outside of the first opening and the lid member; A first external connection terminal, a first external insulating member, and a first electrode connection terminal, wherein the first external connection terminal and the first electrode connection terminal are arranged around the first opening. It is fixed to the lid member by a structure that sandwiches an insulating member. The first external insulating member has a second opening through which the first convex portion penetrates, and the first convex portion has a head portion larger than the second opening outside the first external insulating member, and has a caulking structure. The first external insulating member is fixed to the lid member.

The first external connection terminal included in the battery lid with terminal of the present invention preferably has a third opening, the first external insulating member preferably has a fourth opening, and the first electrode connection terminal has the first opening, It is preferable to have the 2nd convex part which penetrates the 3rd opening and the 4th opening, and the 2nd convex part is the caulking structure, and the 1st external connection terminal, the 1st external insulation member, and the 1st electrode connection terminal are made into the lid member It is preferable to fix.
According to such a feature, the first electrode connection terminal and the first external connection terminal can be electrically connected through the first opening, and at the first fixing portion, the first external connection terminal, the first external connection terminal, 1 The external insulating member and the first electrode connection terminal can be fixed to the lid member.
The first external insulating member included in the battery cover with terminal of the present invention is preferably provided so that the distance between the second opening and the fourth opening is 16 mm or more.
According to such a feature, the distance between the first fixed portion and the second fixed portion can be sufficiently increased, and the first external insulating member can be prevented from moving with respect to the lid member.

The first external insulating member included in the battery cover with a terminal of the present invention preferably has a counterbore hole around the second opening, and the head of the first convex portion is the upper surface of the first external insulating member. It is preferable to arrange in the counterbore hole so as not to protrude from.
According to such a feature, the head portion of the first convex portion can be structured so as not to protrude from the upper surface of the first external insulating member, so that contact with the first external connection terminal located at the upper portion can be prevented. Is possible.
The first external connection terminal included in the battery cover with a terminal of the present invention has a U-shaped cross section, and a first external insulating member on a side surface of the portion having the U-shaped cross section. It is preferable to engage.
According to such a feature, it is possible to prevent the first external connection terminal from moving with respect to the first external insulating member.

The first external connection terminal included in the battery cover with a terminal according to the present invention preferably has first and second insertion portions protruding from two opposing portions of the portion having the U-shaped cross section. The first external insulating member preferably has first and second receiving ports, the first insertion portion is preferably fitted to the first receiving port, and the second insertion portion is fitted to the second receiving port. It is preferable.
According to such a feature, the first insertion portion can be fitted into the first receiving port to form the first engagement portion, and the second insertion portion can be fitted into the second receiving port to form the second engagement. The part can be formed. By providing the first and second engaging portions, even when a force pulling the first external connection terminal upward is applied, the first and second engagement portions become stoppers and the first external connection terminal is deformed. Can be suppressed.
It is preferable that the battery lid with a terminal of the present invention includes a male screw portion provided so as to protrude from the first external connection terminal.
According to such a feature, the first external connection terminal and the bus bar or the external wiring can be joined by inserting the opening of the bus bar, the opening of the external wiring, etc. into the male screw portion and tightening with the female screw. .

The battery lid with terminal of the present invention includes a second external connection terminal disposed outside the lid member, and a second external connection terminal disposed at least partially inside the lid member and electrically connected to the second external connection terminal. It is preferable to include a two-electrode connection terminal, and a second external insulating member that is disposed between the lid member and the second external connection terminal and that engages with the second external connection terminal. It is preferable to provide an opening and a third convex portion that protrudes outside the lid member. The second external connection terminal, the second external insulating member, and the second electrode connection terminal are the second external connection terminal and the second electrode. It is preferable that the connection terminal is fixed to the lid member by a structure that sandwiches the lid member and the second external insulating member around the fifth opening, and the second external insulating member has a sixth protrusion through which the third convex portion passes. It is preferable to have an opening, and the third convex portion Preferably, the outer insulating member has a head portion larger than the sixth opening, and the second external insulating member is fixed to the lid member by a caulking structure. The first external connecting terminal, the first electrode connecting terminal, The first external insulating member, the first opening, and the first convex portion constitute one of the positive terminal structure and the negative terminal structure, and the second external connecting terminal, the second electrode connecting terminal, the second external insulating member, The five openings and the third convex portion preferably constitute the other.
According to such a feature, the battery can be charged / discharged via the positive terminal structure and the negative terminal structure.
It should be noted that at least one of the positive terminal structure and the negative terminal structure may have a terminal structure included in the battery lid of the present invention, and the other structure may have another structure.

The present invention also provides a battery lid with a terminal according to the present invention, the positive electrode sheet and the negative electrode sheet disposed via the separator, the electrolyte, the separator, the positive electrode sheet, the negative electrode sheet, and the electrolyte. A sealed battery comprising the battery case to be housed is also provided.
Furthermore, the present invention accommodates the battery lid with a terminal of the present invention, the positive electrode sheet and the negative electrode sheet disposed via the separator, the electrolyte, the separator, the positive electrode sheet, the negative electrode sheet, and the electrolyte. The battery case includes a positive electrode sheet connected to the positive electrode terminal structure, and the negative electrode sheet also provides a sealed battery connected to the negative electrode terminal structure.

  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.

Battery Cover with Terminal and Sealed Battery FIG. 1 is a schematic top view of a battery cover with a terminal according to this embodiment, and FIG. 2 is a schematic cross-sectional view of the battery cover with a terminal taken along a broken line AA in FIG. 3A is an enlarged sectional view of the battery lid with a terminal in a range B surrounded by a broken line in FIG. 2, and FIG. 3B is an enlarged sectional view of the battery lid with a terminal in a range C surrounded by a broken line in FIG. FIG. 4A is an enlarged cross-sectional view of the battery lid with a terminal in a range D surrounded by a broken line in FIG. 2, and FIG. 4B is an enlarged cross-sectional view of the battery lid with a terminal in a range E surrounded by a broken line in FIG. FIG.
FIG. 5A is a schematic top view of an external connection terminal included in the battery cover with a terminal of the present embodiment, FIG. 5B is a schematic side view of the external connection terminal, and FIG. 5A is a schematic cross-sectional view of the external connection terminal taken along a broken line DD in FIG. 5A, and FIG. 5D is a schematic cross-sectional view of the external connection terminal taken along one-dot chain line EE in FIG.
FIG. 6A is a schematic top view of the external insulating member included in the battery lid with terminal of the present embodiment, and FIG. 6B is a diagram of the external insulating member taken along the broken line HH in FIG. 6C is a schematic cross-sectional view, and FIG. 6C is a schematic cross-sectional view of the external connection terminal and the external insulating member taken along the broken line FF in FIG. 5A and the broken line JJ in FIG. 6 (d) is a schematic cross-sectional view of the external connection terminal and the external insulating member taken along the dashed-dotted line GG in FIG. 5 (a) and the dashed-dotted line KK in FIG. 6 (a). FIG. 6 is a schematic cross-sectional view of an external connection terminal and an external insulating member taken along one-dot chain line EE in FIG. 5A and one-dot chain line LL in FIG.
Fig.7 (a) is a schematic top view of the cover member contained in the battery cover with a terminal of this embodiment, FIG.7 (b) is schematic sectional drawing of the cover member in broken line RR of Fig.7 (a). It is.

FIG. 8A is a schematic top view of the sealed battery of the present embodiment, FIG. 8B is a schematic side view of the sealed battery, and FIG. 8C is a broken line M in FIG. It is a schematic sectional drawing of the sealed battery in -M. FIG. 9A is a schematic cross-sectional view of the sealed battery taken along one-dot chain line NN in FIG. 8A, and FIG. 9B is a schematic plan view of the positive electrode sheet included in the sealed battery. FIG. 9C is a schematic plan view of the negative electrode sheet included in the sealed battery, and FIG. 9D is a schematic cross-sectional view of the positive electrode sheet taken along the broken line PP in FIG. 9B. e) is a schematic sectional drawing of the negative electrode sheet | seat in the broken line QQ of FIG.9 (c).
FIG. 10 is a schematic top view of an assembled battery in which four sealed batteries of this embodiment are connected in series.

The battery lid 50 with a terminal according to the present embodiment is a battery lid with a terminal for sealing a battery case 30 that houses a positive electrode sheet 35, a negative electrode sheet 36, a separator 37, and an electrolyte 33. The lid member 2, the external connection terminal 5a disposed outside the lid member 2, and the electrode connection terminal 6a disposed at least partially inside the lid member 2 and electrically connected to the external connection terminal 5a And an external insulating member 7a that is disposed between the lid member 2 and the external connection terminal 5a and engages with the external connection terminal 5a. The lid member 2 has an opening 3a and a protrusion that protrudes outside the lid member 2. 4a, and the external connection terminal 5a, the external insulation member 7a, and the electrode connection terminal 6a have a structure in which the external connection terminal 5a and the electrode connection terminal 6a sandwich the lid member 2 and the external insulation member 7a around the opening 3a. lid The outer insulating member 7a fixed to the material 2 has an opening 3b through which the convex portion 4a passes, and the convex portion 4a has a head portion 17a larger than the opening 3b outside the outer insulating member 7a, and has a caulking structure. Thus, the external insulating member 7a is fixed to the lid member 2.
The battery cover 50 with a terminal of this embodiment can have the external connection terminal 5b, the electrode connection terminal 6b, and the external insulation member 7b, and the cover member 2 can have the opening 3e and the convex part 4c.
The external connection terminal 5a, the electrode connection terminal 6a, the external insulating member 7a, the opening 3a, and the convex portion 4a can constitute one of the positive terminal structure 14 and the negative terminal structure 15. The external connection terminal 5b, the electrode connection terminal 6b, the external insulating member 7b, the opening 3e, and the convex portion 4c can constitute the other of the positive terminal structure 14 and the negative terminal structure 15. The positive terminal structure 14 and the negative terminal structure 15 can have substantially the same structure.

The sealed battery 60 of the present embodiment includes a battery lid 50 with a terminal of the present embodiment, a positive electrode sheet 35 and a negative electrode sheet 36 disposed via a separator 37, an electrolyte 33, a separator 37, a positive electrode sheet 35, and a negative electrode. And a battery case 30 that accommodates the sheet 36 and the electrolyte 33. The positive electrode sheet 35, the negative electrode sheet 36, and the separator 37 can constitute the power generation element 32. The sealed battery 60 is a battery having a sealed structure, for example, a lithium ion battery, a nickel / hydrogen battery, a nickel / cadmium battery, or the like.
Hereinafter, the battery lid 50 with a terminal and the sealed battery 60 according to the present embodiment will be described.

1. Lid member The lid member 2 is a member for closing the opening of the battery case 30 for inserting the power generation element 32 into the battery case 30. The terminal-attached battery lid 50 has a structure in which the positive electrode terminal structure 14 or the negative electrode terminal structure 15 is provided on the lid member 2. A part of the lid member 2 serves as a component of the positive terminal structure 14 or the negative terminal structure 15. The lid member 2 can have a structure as shown in FIGS. 7A and 7B, for example.
The material of the lid member 2 is not particularly limited as long as the lid member 2 and the battery case 30 are not greatly deformed even when the lid member 2 and the battery case 30 are joined. For example, a metal material such as aluminum, aluminum alloy, iron, iron alloy, stainless steel, Examples thereof include materials obtained by plating nickel, tin, chromium, zinc, etc. on the metal material, and materials such as hard plastics. The lid member 2 can be formed by, for example, sheet metal processing a metal plate having a thickness of 0.7 mm or more and 1.5 mm or less.
The lid member 2 and the battery case 30 can be joined by, for example, laser welding, resistance welding, ultrasonic welding, adhesive, or the like.

2. Positive electrode terminal structure, negative electrode terminal structure The positive electrode terminal structure 14 includes a positive electrode connection terminal 6a connected to the positive electrode sheet 35 included in the power generation element 32, and a positive external connection terminal 5a connected to external wiring, a bus bar, and the like. Are fixed to the lid member 2. The positive electrode terminal structure 14 needs to electrically connect the positive electrode sheet 35 inside the sealed battery 60 and the external wiring outside the sealed battery 60 while maintaining the sealed property of the sealed battery 60. is there. For this reason, the electrode connection terminal 6 a disposed mainly inside the lid member 2 and the external connection terminal 5 a disposed outside the lid member 2 are electrically connected via the opening 3 a of the lid member 2. Further, since the leakage current may flow when the electrode connection terminal 6a and the external connection terminal 5a are electrically connected to the lid member 2, the positive electrode terminal structure 14 is disposed between the lid member 2 and the external connection terminal 5a. The external insulating member 7a is provided. Further, the positive electrode terminal structure 14 can include an internal insulating member 11 a disposed between the lid member 2 and the electrode connection terminal 6 a and a gasket 12 a disposed in the opening 3 a of the lid member 2. This can prevent leakage current from flowing and leakage of the electrolyte 33 from the opening 3a.

In the negative electrode terminal structure 15, a negative electrode connection terminal 6 b connected to the negative electrode sheet 36 included in the power generation element 32 and a negative external connection terminal 5 b connected to external wiring, a bus bar 52, and the like are fixed to the lid member 2. It is a structure. The negative electrode terminal structure 15 needs to electrically connect the negative electrode sheet 36 inside the sealed battery 60 and the external wiring outside the sealed battery 60 while maintaining the hermeticity of the sealed battery 60. is there. For this reason, the electrode connection terminal 6 b arranged mainly inside the lid member 2 and the external connection terminal 5 b arranged outside the lid member 2 are electrically connected via the opening 3 e of the lid member 2. Further, since the leakage current may flow when the electrode connection terminal 6b and the external connection terminal 5b are electrically connected to the lid member 2, the negative electrode terminal structure 15 is disposed between the lid member 2 and the external connection terminal 5b. The external insulating member 7b is provided. Further, the negative electrode terminal structure 15 can include an internal insulating member 11 b disposed between the lid member 2 and the electrode connection terminal 6 b and a gasket 12 b disposed in the opening 3 e of the lid member 2. This can prevent leakage current from flowing and leakage of the electrolyte 33 from the opening 3e.
In addition, the electrode connection terminal 6, the external connection terminal 5, the lid member 2, or the bus bar 52 may be a sheet metal processed metal sheet (sheet metal processed product). A sheet metal processed product is a sheet metal processed from one or more metal sheets. Cutting, bending, pressing, hollowing, punching, laser processing, welding, drawing, etc. Etc. Further, the electrode connection terminal 6, the external connection terminal 5, the lid member 2 or the bus bar 52 may be obtained by attaching a metal member or the like to a sheet metal processed product.
The material of the external insulating member 7 or the internal insulating member 11 may be plastic.

  In this embodiment, since the positive electrode terminal structure 14 and the negative electrode terminal structure 15 have substantially the same structure, the positive electrode terminal structure 14 will be mainly described here. The description of the positive electrode terminal structure 14 also applies to the negative electrode terminal structure 15 as long as there is no contradiction. The external connection terminal 5a, the electrode connection terminal 6a, the external insulating member 7a, the gasket 12a, the male screw portion 9a, the opening 3a, the opening 3b, the opening 3c, the opening 3d, the opening 3m, the convex portion 4a, the positive terminal structure 14 The convex portion 4b, counterbore hole 21a, first fixing portion 53, and second fixing portion 54 are the external connection terminal 5b, electrode connection terminal 6b, external insulation member 7b, gasket 12b, male screw portion of the negative electrode terminal structure 15, respectively. 9b, opening 3e, opening 3f, opening 3g, opening 3h, opening 3n, protrusion 4c, protrusion 4d, counterbore 21b, third fixing part 55, and fourth fixing part 56.

In the positive electrode terminal structure 14, the lid member 2 has an opening 3 a, an electrode connection terminal 6 a disposed inside the lid member 2 through the opening 3 a, and an external connection terminal disposed outside the lid member 2. 5a is electrically connected. In the present embodiment, in the first fixing portion 53, the external connection terminal 5a, the external insulation member 7a, the internal insulation member 11a, and the electrode connection terminal 6a are arranged around the opening 3a. The lid member 2, the external insulating member 7a, and the internal insulating member 11a are fixed to the lid member 2 by a structure sandwiching the lid member 2, the external insulating member 7a, and the internal insulating member 11a.
In a specific embodiment of the first fixing portion 53, the electrode connecting terminal 6a has a convex portion 4b, and the convex portion 4b is an opening 3m of the internal insulating member 11a, an opening 2a of the lid member 2, and an opening of the external insulating member 7a. The external connection terminal 5a and the like can be fixed to the lid member 2 by a caulking structure in which the head 3d and the external connection terminal 5a are joined to each other through the opening 3c of the external connection terminal 5a. Moreover, the convex part 4b can be formed by carrying out the half punching process of the metal plate, for example. Moreover, the convex part 4b and the external connection terminal 5a can be joined by pressurizing and deforming the head part of the convex part 4b, and a caulking structure can be formed. For example, in the positive electrode terminal structure 14, the first fixing portion 53 can be configured to fix the external connection terminal 5 a and the like to the lid member 2 by the structure shown in FIG. In the negative electrode terminal structure 15, the third fixing portion 55 can be configured to fix the external connection terminal 5 b and the like to the lid member 2 by the structure shown in FIG.
The first fixing portion 53 may have a form in which the external connection terminal 5a has a convex portion and the external connection terminal 5a and the like are fixed to the lid member 2 by a caulking structure in which the convex portion and the electrode connection terminal 6a are joined. .

  As other embodiment of the 1st fixing | fixed part 53, you may use a rivet. For example, a rivet passes through the opening of the electrode connection terminal 6a, the opening 3m of the internal insulating member 11a, the opening 2a of the lid member 2, the opening 3d of the external insulating member 7a, and the opening 3c of the external connecting terminal 5a, and the rivet is connected to the electrode connecting terminal. The external connection terminal 5a and the like can be fixed to the lid member 2 by a caulking structure joined to 6a or the external connection terminal 5a. Moreover, as other embodiment of the 1st fixing | fixed part 53, you may use a volt | bolt and a nut. For example, a bolt is passed through the opening of the electrode connection terminal 6a, the opening 3m of the internal insulation member 11a, the opening 2a of the lid member 2, the opening 3d of the external insulation member 7a, and the opening 3c of the external connection terminal 5a, and tightened with a bolt and nut. Thereby, it can be set as the form which fixes the external connection terminal 5a etc. to the cover member 2. FIG.

  The positive electrode terminal structure 14 can include a gasket 12a disposed between the inner wall of the opening 3a of the lid member 2 and the convex portion 4d of the electrode connection terminal 6a in the first fixing portion 53. Thus, leakage of the electrolyte 33 from the opening 3a can be prevented. Further, the gasket 12a can be provided so as to be sandwiched between the electrode connection terminal 6a and the external connection terminal 5a. Further, the gasket 12a is provided so as to be in contact with the electrode connection terminal 6a, the external connection terminal 5a, the inner wall of the opening 3a of the lid member 2, the inner wall of the opening 3m of the internal insulating member 11a, or the inner wall of the opening 3d of the external insulating member 7a. be able to. When the gasket 12a is disposed between the electrode connection terminal 6a and the lid member 2, the internal insulating member 11a may be omitted.

In the positive electrode terminal structure 14, the lid member 2 has a convex portion 4 a that protrudes outside the lid member 2, and the external insulating member 7 a has an opening 3 b through which the convex portion 4 a passes. The convex portion 4a has a head portion 17a larger than the opening 3b on the outside of the external insulating member 7a. The second fixing portion 54 fixes the external insulating member 7a to the lid member 2 by a caulking structure. Moreover, the convex part 4a can be formed by carrying out the half punching process of the metal plate, for example. Moreover, the head part 17a can be formed by pressurizing and deforming the convex part 4a, and a caulking structure can be formed. The diameter of the convex part 4a in the opening 3b can be 2 mm or more and 15 mm or less, for example. The head portion 17a of the convex portion 4a can have a diameter of 102% to 130% of the diameter of the convex portion 4a in the opening 3b, and preferably has a diameter of 102% to 120%. For example, when the diameter of the convex portion 4a in the opening 3b (substantially the same as the diameter of the opening 3b) is 5.9 mm, the diameter of the head 17a can be 6.0 mm to 7.0 mm.
For example, in the positive electrode terminal structure 14, the second fixing portion 54 can be configured to fix the external insulating member 7 a to the lid member 2 by the structure shown in FIG. In the negative electrode terminal structure 15, the fourth fixing portion 56 can be configured to fix the external insulating member 7 b to the lid member 2 by the structure shown in FIG.
With such a structure, the external insulating member 7 a can be fixed to the lid member 2 by both the first fixing portion 53 and the second fixing portion 54. Thus, even when a force is applied to the external insulating member 7a, the external insulating member 7a can be prevented from moving with respect to the lid member 2.
Moreover, it is preferable to insulate the upper part of the convex part 4a with an insulating tape or the like.

  The male screw portion 9 a may be provided anywhere on the external connection terminal 5 a, but can be provided substantially immediately above the second fixing portion 54. The male screw portion 9 a can be provided so as to be positioned between the first fixing portion 53 and the second fixing portion 54.

  The external insulating member 7a can be provided so that the distance between the opening 3b and the opening 3d is 16 mm or more. Thereby, the distance between the 1st fixing | fixed part 53 and the 2nd fixing | fixed part 54 can be fully enlarged, and it can suppress that the external insulation member 7a moves with respect to the cover member 2. FIG. The distance between the openings can be the distance between the centers of the openings. For example, the distance X shown in FIG. Moreover, the diameter of the opening 3b can be 2 mm or more and 15 mm or less, and the diameter of the opening 3d can be 2 mm or more and 15 mm or less.

The external insulating member 7a may have a counterbore hole 21a around the opening 3b, and the head portion 17a of the convex portion 4a may be disposed in the counterbore hole 21a. Thereby, it can be set as the structure where the head 17a of the convex part 4a does not protrude from the upper surface of the external insulation member 7a. Moreover, the convex part 4a can be provided so that the vertex of the convex part 4a may become lower than the upper surface of the external insulating member 7a. Further, the size of the counterbore hole 21 can be made smaller than the size of the lower surface of the male screw portion 9a. Thus, even when the male screw portion 9a is detached from the external connection terminal 5a, it is possible to prevent the male screw portion 9a and the convex portion 4a from contacting each other. The counterbore 21a can be provided around the opening 3b outside the external insulating member 7a, as shown in FIGS. 3 (a), 6 (a) and 6 (b). The diameter of the counterbore 21a can be, for example, 3 mm or more and 20 mm or less, preferably 8 mm or more and 15 mm or less. The counterbore 21a can have a diameter of 102% to 150% of the diameter of the opening 3b.
The head portion 17a of the convex portion 4a can be provided so as to cover 0.02% to 30% of the upper surface (groove portion of the counterbored hole 21a) of the external insulating member 7a in the counterbored hole 21a, preferably 0.05%. It can be provided to cover ~ 22%.
The thickness (remaining thickness) of the external insulating member 7a in the portion provided with the counterbore 21a may be 25% to 50% of the thickness of the external insulating member 7a. Moreover, the thickness of the external insulating member 7a in the part provided with the counterbore hole 21a can be 0.5 mm or more and 3 mm or less, for example. Moreover, the thickness of the external insulating member 7a can be, for example, 1 mm or more and 6 mm or less.

The positive electrode terminal structure 14 can have a male screw portion 9a provided so as to protrude from the external connection terminal 5a. By inserting the opening of the bus bar 52 and the opening of the external wiring into the male screw portion 9a and tightening with the female screw 10, the external connection terminal 5a and the bus bar 52 or the external wiring can be joined.
The male screw portion 9a can be provided, for example, like the battery lid 50 shown in FIGS. The male screw portion 9a can be formed by fixing a male screw in the opening 3i of the external connection terminal 5a shown in FIG.
Further, as in the assembled battery 62 shown in FIG. 10, the bus bar 52 and the external connection terminal 5 can be joined by tightening with the male screw portion 9 and the female screw 10, and a plurality of sealed batteries 60 are connected in series. Can be connected to. The external connection terminal 5 at the end of the series connection can be joined to the external output wiring by the male screw portion 9 and the female screw.
When the male screw portion 9 and the female screw 10 are tightened, the female screw 10 is tightened by applying a tightening torque. When this torque is transmitted to the external connection terminal 5, the external connection terminal 5 may be deformed or rotated. Moreover, when the force which the bus-bar 52 or external wiring pulls the external connection terminal 5 upwards is added, there exists a possibility that the external connection terminal 5 may deform | transform or rotate.

  Since the external insulating member 7 a is fixed to the lid member 2 by the first fixing portion 53 and the second fixing portion 54, the external insulating member 7 a can be prevented from moving with respect to the lid member 2. Furthermore, since the external connection terminal 5a is fixed to the lid member 2 and the external connection terminal 5a in the first fixing portion 53 and engages with the external insulation member 7a in the engagement portion 58, the external connection terminal 5a is externally insulated. It is possible to prevent the member 7a from moving. For this reason, even when the screw tightening torque is transmitted to the external insulating member 7a or when the bus bar 52 or the external wiring is applied with a force pulling the external connection terminal 5 upward, the external connection terminal 5a moves relative to the lid member 2. It is possible to prevent the external connection terminal 5a from being deformed and rotated. Further, the engaging portion 58 can be provided so that the male screw portion 9 a is positioned between the engaging portion 58 and the first fixing portion 53.

The external connection terminal 5a may be a metal plate processed from a metal plate (sheet metal processed product). Further, the external connection terminal 5a can have a portion having a U-shaped cross section. For example, as shown in FIGS. 5A, 5 </ b> B, and 5 </ b> D, the external connection terminal 5 a can have a portion 23 having a U-shaped cross section. Further, the external connection terminal 5a and the external insulating member 7a may engage with each other on the side surface of the portion 23 having a U-shaped cross section. Further, the portion 23 having a U-shaped cross section can be provided so that the male screw portion 9 a is located between the portion 23 and the first fixing portion 53.
For example, grooves 28a and 28b are provided in the external insulating member 7a as shown in FIG. 6A, and the ends of two opposing portions of the portion 23 having a U-shaped cross section as shown in FIG. By engaging the grooves 28a and 28b, the engaging portions 58a and 58b can be formed, and the external connection terminal 5a and the external insulating member 7a can be engaged.

The external connection terminal 5a can have an insertion portion 24a and an insertion portion 24b that protrude from two opposing portions of the portion 23 having a U-shaped cross section. The insertion portions 24a and 24b can be provided so as to protrude from the portion 23 on the side opposite to the first fixed portion side. For example, the insertion portions 24a and 24b can be provided as shown in FIGS.
The external insulating member 7a can have receptacles 27a and 27b. Moreover, the insertion part 24a is fitted to the receiving port 27a, and the engaging part 58c is formed. Further, the insertion portion 24b is fitted into the receiving port 27b to form an engaging portion 58d. By providing the engaging portions 58c and 58d, even when a force that pulls the external connection terminal 7a upward is applied, it is possible to prevent the engaging portions 58c and 58d from acting as a stopper and the external connection terminal 5a from being deformed. . For example, as shown in FIGS. 6A, 6C, and 6D, the receiving ports 27a and 27b can be provided in the external insulating member 7a, and the engaging portions 58c and 58d can be formed.
Further, the external connection terminal 5a can have a detection wiring connection portion between the insertion portions 24a and 24b. Thus, the voltage of the secondary battery can be measured by the battery monitoring unit (BMU). The detection wiring can be connected to the external connection terminal 5a using the opening 3j.

3. Battery Case The battery case 30 is a container that houses the power generation element 32 (including the positive electrode sheet 35, the negative electrode sheet 36, and the separator 37) and the electrolyte 33. The battery case 30 houses a power generation element 32 and the like as shown in FIG. The material of the battery case 30 may be a hard material or a soft material. Specifically, examples of the material of the battery case 30 include metal materials such as aluminum, aluminum alloy, iron, iron alloy, and stainless steel, hard plastic, and laminate pouch. The material of the battery case 30 may be a metal material plated with nickel, tin, chromium, zinc, or the like.
Further, the battery case 30 may have an opening closed by the lid member 2. As a result, the power generation element 32 can be accommodated in the battery case 30.

4). Power Generation Element The power generation element 32 includes a positive electrode sheet 35, a negative electrode sheet 36, and a separator 37. The power generation element 32 performs a battery reaction together with the electrolyte 33. The sealed battery 60 can be discharged or charged by this battery reaction. The sealed battery 60 may have one power generation element 32 or a plurality of power generation elements 32.
As in the sealed battery 60 illustrated in FIG. 9A, the power generation element 32 includes a separator 37, and a positive electrode sheet 35 and a negative electrode sheet 36 that are disposed via the separator 37. The power generation element 32 may have a laminated structure in which the positive electrode sheet 35 and the negative electrode sheet 36 arranged via the separator 37 are stacked, and the positive electrode sheet 35 and the negative electrode sheet 36 arranged via the separator 37 are wound. It may have a wound structure.
For example, the power generation element 32 includes one separator 37 that is folded in a zigzag manner, and positive electrode sheets 35 and negative electrode sheets 36 that are arranged in each trough of the separator 37 and are alternately arranged via the separators 37. Can do.

  The separator 37 has a sheet shape and is disposed between the positive electrode sheet 35 and the negative electrode sheet 36. The separator 37 is not particularly limited as long as it can prevent a short-circuit current from flowing between the positive electrode sheet 35 and the negative electrode sheet 36, and the electrolyte can permeate. For example, a microporous film of polyolefin is used. be able to.

The positive electrode sheet 35 includes a positive electrode current collector sheet 40 and a positive electrode active material layer 43 provided on the positive electrode current collector sheet 40. The positive electrode sheet 35 can be formed, for example, by forming the positive electrode active material layer 43 on both surfaces of the rectangular positive electrode current collector sheet 40. The positive electrode sheet 35 can be provided, for example, as shown in FIGS.
The positive electrode sheet 35 can be joined to the electrode connection portion 8 a of the electrode connection terminal 6 a at the end portion of the positive electrode current collector sheet 40. The positive electrode current collector sheet 40 is, for example, a metal foil. The positive electrode active material layer 43 can be formed on the positive electrode current collector sheet 40 by adding a conductive agent, a binder, or the like to the positive electrode active material and applying it. As the positive electrode active material, for example, a lithium transition metal composite oxide capable of reversibly occluding and releasing lithium ions can be used.

The negative electrode sheet 36 includes a negative electrode current collector sheet 41 and a negative electrode active material layer 44 provided on the negative electrode current collector sheet 41. The negative electrode sheet 36 can be formed, for example, by forming the negative electrode active material layers 44 on both sides of the square negative electrode current collector sheet 41. The negative electrode sheet 36 can be provided, for example, as shown in FIGS.
The negative electrode sheet 36 can be joined to the electrode connection portion 8 b of the electrode connection terminal 6 b at the end of the negative electrode current collection sheet 41. The negative electrode current collector sheet 15 is, for example, a metal foil. The negative electrode active material layer 44 can be formed on the negative electrode current collector sheet 41 by adding a conductive agent, a binder, or the like to the negative electrode active material, and applying a coating method or the like. As the negative electrode active material, for example, in the case of a lithium ion secondary battery, graphite, partially graphitized carbon, hard carbon, soft carbon, LiTiO ₄ , Sn alloy, or the like can be used singly or in combination.

5. Electrolyte The electrolyte 33 can use carbonates, lactones, ethers, esters, and the like as a solvent, and a mixture of two or more of these solvents can also be used. Among these, it is particularly preferable to use a mixture of a cyclic carbonate and a chain carbonate. The electrolyte 33 is, for example, a lithium salt such as LiCF ₃ SO ₃ , LiAsF ₆ , LiClO ₄ , LiBF ₄ , LiPF ₆ , LiBOB, LiN (CF ₃ SO ₂ ) ₂ , LiN (C ₂ F ₅ SO ₂ ) as an electrolyte. A solution in which a solute is dissolved in an organic solvent. In addition, additives such as VC (vinylene carbonate), PS (propane sultone), VEC (vinyl ethyl carbonate), PRS (propene sultone), flame retardant, etc. may be used alone or in combination as necessary. Good.

Production of Simulated Cell A battery lid 50 with a terminal as shown in FIGS. 1 to 7 was produced, this battery lid 50 was assembled in an empty battery case 30, and the lid member 2 and the battery case 30 were joined by laser welding. The simulation cell of the Example was produced.
The external connection terminal 5a was manufactured by sheet metal processing of a copper plate having a thickness of 1.5 mm, the width was about 13 mm, and the length was about 50 mm. The diameter of the opening 3b is 5.9 mm, the diameter of the opening 3c is about 8 mm, the diameter of the opening 3i is about 8 mm, the center of the opening 3c (the center of the first fixing portion 53) and the center of the opening 3i (male). The distance from the screw portion 9a) was about 23 mm. The lengths of the insertion portions 24a and 24b were about 2 mm, and the length of the portion 23 having a U-shaped cross section was about 6.5 mm. Moreover, the length of the foot part of the part 23 was about 6.5 mm. The distance between the first fixing portion 53 and the second fixing portion 54 (the distance between the center of the opening 3b and the center of the opening 3c) was 23 mm.
In addition, as a comparative example, a simulation cell in which the second fixing portion 54 is not provided was manufactured. Further, in the simulation cell of the comparative example, the portion 23 having a U-shaped cross section is not provided, but the insertion portion is provided at the end of the external connection terminal.

The load test was performed using the simulation cell of the load test example and the simulation cell of the comparative example. The male screw portion was inserted into one opening of the L-shaped bus bar having two openings, and the M8 flange nut was tightened to join the bus bar and the external connection terminal. The simulated cell was fixed with a vise, the bus bar was pulled upward with a tensile tester, and the load at which deformation of the external connection terminal started was measured.
In the simulation cell of the comparative example, the external connection terminal started to float at 19.6 N (2 kgf), the deformation of the external connection terminal started, and the external insulating member 7 a was broken at 29.4 N (3 kgf). In contrast, in the simulation cell of the example, the external connection terminal started to float at 98 N (10 kgf), and the deformation of the external connection terminal started, but the external insulating member and the external connection terminal were not destroyed. Therefore, it was found that the simulation cell of the example can withstand a load about 5 times that of the comparative example.
The external connection terminals of the example are more useful than the external connection terminals of the comparative example because the external connection terminals can be applied with a considerably large force when making assembled batteries or connecting cables. I found out.

Torque test A torque test was performed using the simulation cell of the example and the simulation cell of the comparative example. An M8 flange nut was fixed to the male screw portion with a torque of 10 N · m, and the torque applied to the nut was gradually increased with a torque wrench. The torque was increased until the torque reached 20 N · m or the external connection terminal was damaged.
In the simulation cell of the comparative example, the torque applied to the nut was near 16 N · m, and the external connection terminal was damaged near the first fixing portion 53. On the other hand, in the simulation cell of the example, the external connection terminal was not damaged even when a torque of 20 N · m was applied to the nut. Therefore, it was found that the simulated cell of the example can prevent the external connection terminal from being deformed when the assembled battery is manufactured.

Strength test of the second fixing portion Four distances between the first fixing portion 53 and the second fixing portion 54 (distances between the center of the opening 3b and the center of the opening 3c) were 10 mm, 12 mm, 14 mm, or 16 mm. A simulated cell was prepared. A simulated cell was manufactured with the distance between the male screw portion 9a and the first fixing portion 53 remaining 23 mm. The simulated cell was fixed with a vise, an L-shaped bus bar was attached to the male screw portion 9a, and the L-shaped bus bar was pulled up at 29.4 N (3 kgf) to examine whether the second fixing portion 54 was broken or not. The experimental results are shown in Table 1.

In the simulation cell in which the distance between the fixed parts was 10 mm or 12 mm, the second fixed part was broken. In the simulation cell in which the distance between the fixed parts was 14 mm, the second fixed part did not break, but cracks occurred. In the simulation cell in which the distance between the fixed portions was 16 mm, the second fixed portion was not broken and no crack was generated.
Therefore, it has been found that the breakage of the second fixing portion can be prevented by setting the distance between the first fixing portion 53 and the second fixing portion 54 to 16 mm or more.

2: Lid member 3a, 3b, 3c, 3d, 3e, 3g, 3h, 3i, 3j, 3k, 3m, 3n: Opening 4a, 4b, 4c, 4d: Projection 5, 5a, 5b, 5c, 5d 5e, 5f, 5g, 5h, 5i, 5j: External connection terminals 6, 6a, 6b: Electrode connection terminals 7, 7a, 7b: External insulation members 8, 8a, 8b: Electrode connection parts 9, 9a, 9b, 9d , 9e, 9f, 9g, 9h, 9i, 9j: male screw portion 10a, 10b, 10c, 10d, 10e, 10f: female screw 11, 11a, 11b: internal insulating member 12, 12a, 12b: gasket 14: positive electrode terminal Structure 15: Negative electrode terminal structure 17, 17a, 17b: Head portion 21, 21a, 21b: Counterbore 23: Portion having a U-shaped cross section 24a, 24b: Insertion portion 27a, 27b: Receiving port 28a, 28b , 8c: groove 30: battery case 32: power generation element 33: electrolyte 35: positive electrode sheet 36: anode sheet 37: Separator 40: positive electrode current collector sheet
41: Negative electrode current collector sheet 43: Positive electrode active material layer 44: Negative electrode active material layer 50: Battery cover with terminal 52a, 52b, 52c: Bus bar 53: First fixing part 54: Second fixing part 55: Third fixing part 56 : Fourth fixing part 58a, 58b, 58c, 58d: engaging part 60, 60a, 60b, 60c, 60d: sealed battery 62: assembled battery

Claims (10)

A battery lid with terminals for sealing a battery case containing a positive electrode sheet, a negative electrode sheet, a separator, and an electrolyte,
The battery lid includes a lid member, a first external connection terminal disposed on the outside of the lid member, and at least a part of the battery lid disposed on the inside of the lid member and electrically connected to the first external connection terminal. A first electrode connecting terminal, and a first external insulating member disposed between the lid member and the first external connecting terminal and engaged with the first external connecting terminal,
The lid member includes a first opening and a first convex portion projecting to the outside of the lid member,
The first external connection terminal, the first external insulation member, and the first electrode connection terminal have a structure in which the first external connection terminal and the first electrode connection terminal sandwich the lid member and the first external insulation member around the first opening. Fixed to the lid member by
The first external insulating member has a second opening through which the first convex portion passes,
The first convex portion has a head portion larger than the second opening on the outside of the first external insulating member, and the first external insulating member is fixed to the lid member by a caulking structure. . The first external connection terminal has a third opening,
The first external insulating member has a fourth opening,
The first electrode connection terminal has a second protrusion that passes through the first opening, the third opening, and the fourth opening,
The battery lid according to claim 1, wherein the second convex portion fixes the first external connection terminal, the first external insulating member, and the first electrode connection terminal to the lid member by a caulking structure.   The battery lid according to claim 2, wherein the first external insulating member is provided such that a distance between the second opening and the fourth opening is 16 mm or more. The first external insulating member has a counterbore around the second opening,
The battery lid according to any one of claims 1 to 3, wherein the head of the first convex portion is disposed in the counterbore so that the head does not protrude from the upper surface of the first external insulating member.   The first external connection terminal has a U-shaped cross section, and the first external connection terminal engages with the first external insulating member on a side surface of the portion having the U-shaped cross section. The battery cover as described in any one. The first external connection terminal has first and second insertion portions that respectively protrude from two opposing portions of the portion having the U-shaped cross section,
The first external insulating member has first and second receiving ports,
The first insertion part is fitted to the first receiving port,
The battery lid according to claim 5, wherein the second insertion part is fitted in the second receiving port.   The battery cover according to claim 1, further comprising a male screw portion provided so as to protrude from the first external connection terminal. The battery lid includes a second external connection terminal disposed outside the lid member, and a second electrode connection terminal disposed at least partially inside the lid member and electrically connected to the second external connection terminal. And a second external insulating member disposed between the lid member and the second external connection terminal and engaged with the second external connection terminal,
The lid member includes a fifth opening and a third convex portion projecting to the outside of the lid member,
The second external connection terminal, the second external insulation member, and the second electrode connection terminal have a structure in which the second external connection terminal and the second electrode connection terminal sandwich the lid member and the second external insulation member around the fifth opening. Fixed to the lid member by
The second external insulating member has a sixth opening through which the third convex portion passes,
The third convex portion has a head portion larger than the sixth opening outside the second external insulating member, and fixes the second external insulating member to the lid member by a caulking structure.
The first external connection terminal, the first electrode connection terminal, the first external insulating member, the first opening, and the first convex portion constitute one of the positive electrode terminal structure and the negative electrode terminal structure, and the second external connection terminal, The battery lid according to any one of claims 1 to 7, wherein the second electrode connection terminal, the second external insulating member, the fifth opening, and the third convex portion constitute the other.   The battery lid according to any one of claims 1 to 8, the positive electrode sheet and the negative electrode sheet arranged via the separator, the electrolyte, the separator, the positive electrode sheet, the negative electrode sheet, and the A sealed battery comprising the battery case containing an electrolyte. The battery case containing the battery lid according to claim 8, the positive electrode sheet and the negative electrode sheet arranged via the separator, the electrolyte, the separator, the positive electrode sheet, the negative electrode sheet, and the electrolyte. And
The positive electrode sheet is connected to the positive electrode terminal structure,
The negative electrode sheet is a sealed battery connected to the negative electrode terminal structure.