JP2012049076A - Battery lid with electrode terminal, method for manufacturing battery lid with electrode terminal, and sealed battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery lid with an electrode terminal with a packing capable of increasing sealability of a battery between an opening of the battery lid and a wiring.SOLUTION: This battery lid with an electrode terminal comprises a lid member having an outer face, an inner face and an opening; a packing having a cylindrical part penetrating through the opening of the lid member, an inner flange part and an outer flange part; an electrode connection terminal having a base part arranged on an inner face side of the lid member, a connection part for connecting to a positive electrode sheet or a negative electrode sheet, and a rivet part projecting from the base part and penetrating through an opening inside the cylindrical part; and an outer connection terminal jointed to the rivet part on an outer face side of the lid member. The cylindrical part is in tight contact with a side wall of the opening of the lid member outside, and in tight contact with the rivet part inside. The inner flange part is directly nipped and held between the base part and the inner face of the lid member, and the outer flange part is directly nipped and held between the outer connection terminal and the outer face of the lid member.

Description

  The present invention relates to a battery lid with electrode terminals, a method for producing a battery lid with electrode terminals, and a sealed battery.

In recent years, sealed batteries having an electrolyte solution therein, such as lithium secondary batteries and nickel / hydrogen batteries, have been used for various applications.
Such a sealed battery generally has a structure in which a battery lid is joined to a battery case in which a positive electrode sheet, a negative electrode sheet, and an electrolytic solution are disposed inside via a separator. The positive electrode sheet and the negative electrode sheet are electrically connected to different external connection terminals, and are charged or discharged through the external connection terminals. The method of electrically connecting the positive electrode sheet and the negative electrode sheet (these sheets are referred to as electrode sheets) and the external connection terminals varies depending on the battery, but is electrically connected through the wiring penetrating the opening of the battery lid. The method to do is generally known (for example, patent document 1).

JP 2009-277604 A

However, when the electrode sheet and the external connection terminal are electrically connected via the wiring penetrating the opening of the battery lid, a packing or the like is provided between the opening of the battery lid and the wiring to enhance the sealing performance of the battery. However, it is necessary to prevent leakage of the electrolyte and prevent moisture from entering the sealed battery from the outside.
This invention is made | formed in view of such a situation, and provides the battery cover with an electrode terminal provided with the packing which can make the sealing performance of a battery high between opening and wiring of a battery cover. .

  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 has an outer surface and an inner surface, and has an opening. A lid member having a cylindrical portion, an inner flange portion and an outer flange portion penetrating through the opening of the lid member, and a base portion disposed on the inner surface side of the lid member and a positive electrode sheet or a negative electrode sheet. An electrode connection terminal having a connection part for projecting and a rivet part protruding from the base part and penetrating through an opening inside the cylindrical part, and an external connection terminal joined to the rivet part on the outer surface side of the lid member, The cylindrical portion is in close contact with the side wall of the opening of the lid member on the outside, and is in close contact with the rivet portion on the inside, and the internal flange portion is directly on the base and the inner surface of the lid member. Is lifting, the outer flange portion provides a conditioned electrode terminal battery lid, characterized in that it is directly held between the outer surface of the external connection terminal and said lid member.

According to the present invention, since the rivet portion of the electrode connection terminal penetrating the opening of the lid member is joined to the external connection terminal, the electrode sheet and the external connection terminal can be electrically connected via the electrode connection terminal. it can. By connecting external wiring to the external connection terminal, the sealed battery can be charged or discharged. In addition, since the rivet portion, which is a part of the electrode connection terminal, passes through the opening of the lid member and is joined to the external connection terminal, the joint surface of the wiring component between the electrode sheet and the external connection terminal can be reduced. It is possible to suppress an increase in electrical resistance due to the joint surface.
According to the present invention, the cylindrical portion of the packing penetrating through the opening of the lid member is in close contact with the side wall of the opening of the lid member on the outside, and is in close contact with the rivet portion of the electrode connection terminal on the inside. Leakage of liquid and entry of moisture from the outside into the battery can be prevented, and the sealing performance of the battery can be increased.

According to the present invention, the packing disposed between the electrode connection terminal and the lid member includes the internal flange portion directly sandwiched between the base portion of the electrode connection terminal and the inner surface of the lid member, and the external connection terminal and the lid member. Since it has the external flange part clamped directly by the outer surface, the contact area of packing and an electrode connection terminal and the contact area of packing and a cover member can be enlarged, and the sealing performance of a battery can be made high.
According to the present invention, at the corner between the surface where the internal flange portion of the packing contacts the inner surface of the lid member and the curved surface where the cylindrical portion of the packing contacts the side wall of the opening of the lid member, the packing and the lid member At the corner between the surface where the outer flange portion of the packing and the outer surface of the lid member are in contact with the curved surface where the cylindrical portion of the packing and the side wall of the opening of the lid member are in contact with each other. And the lid member can be more closely attached. At these two corners, the packing and the lid member can be more closely adhered to each other, so that the sealing performance of the battery can be further increased.
According to the present invention, when a packing having a shape having a cylindrical portion, an internal flange portion, and an external flange portion is attached to the lid member, the electrode connection terminal, the external connection terminal, and the lid member are integrated, and at the same time, the packing is attached. Therefore, the manufacturing process can be further simplified.

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. FIG. 3 is an enlarged view of a range B surrounded by a dotted line in FIG. 2. FIG. 4 is an enlarged view of a range C surrounded by a dotted line in FIG. 3. It is a schematic sectional drawing of a part of conventional battery cover with an electrode terminal. (A) is a schematic top view of the electrode connection terminal which is a component of the battery lid with an electrode terminal of one embodiment of the present invention, and (b) is a component of the battery lid with an electrode terminal of one embodiment of the present invention. It is a schematic side view of a certain electrode connection terminal. (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 GG of (a). (A) is a schematic plan view of the internal insulation member which is a component of the battery lid with electrode terminals of one embodiment of the present invention, and (b) is a schematic cross-sectional view taken along the dotted line HH in (a). (A) is a schematic top view of the cover member 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 II of (a). (A) is a schematic top view of the external insulation member 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 JJ of (a). (A) is a schematic plan view of the external connection terminal 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 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 electrolyte solution, and has an outer surface and an inner surface. And a lid member having an opening, a packing having a cylindrical portion, an inner flange portion, and an outer flange portion penetrating the opening of the lid member, and a base portion and a positive electrode sheet disposed on the inner surface side of the lid member Alternatively, an electrode connection terminal having a connection part for connecting to a negative electrode sheet and a rivet part protruding from the base part and penetrating through an opening inside the cylindrical part, and an external connection for joining the rivet part on the outer surface side of the lid member The cylindrical portion is in close contact with the side wall of the opening of the lid member on the outer side, is in close contact with the rivet portion on the inner side, and the internal flange portion is Is directly held between the inner surface of member, said outer flange portion, characterized in that it is directly held between the outer surface of the external connection terminal and said lid member.

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, it is preferable that the external connection terminal has an opening through which the rivet portion passes and is joined to the rivet portion by caulking an end of the rivet portion.
According to such a structure, an electrode connection terminal and an external connection terminal can be joined easily, and the joining surface of the wiring components between an electrode sheet and an external connection terminal can be reduced more.
In the battery lid with electrode terminals of the present invention, the packing is preferably made of a fluororesin.
According to such a configuration, the adhesion between the packing and the electrode connection terminal and the adhesion between the packing and the lid member can be further increased, and the sealing performance of the battery can be further increased.

In the battery lid with an electrode terminal of the present invention, the battery is sandwiched between the base portion of the electrode connection terminal and the inner surface of the lid member, and is sandwiched between the internal insulating member having an opening, the external connection terminal, and the outer surface of the lid member. And an outer insulating member having an opening, wherein the rivet portion penetrates the opening of the inner insulating member and the opening of the outer insulating member, and the inner flange portion is an opening of the inner insulating member. It is preferable that the external flange portion is provided in an opening of the external insulating member.
According to such a configuration, it is possible to prevent leakage current from flowing between the electrode connection terminal and the lid member, and it is possible to prevent leakage current from flowing between the external connection terminal and the lid member. it can.
In the battery lid with electrode terminals of the present invention, it is preferable that the internal flange portion is in close contact with the side wall of the opening of the internal insulating member, and the external flange portion is in close contact with the side wall of the opening of the external insulating member.
According to such a configuration, the internal insulating member and the external insulating member can be fixed.

In the battery lid with electrode terminals of the present invention, it is preferable that the opening of the external insulating member has a diameter larger than the outer diameter of the cylindrical portion of the packing.
According to such a structure, a part of packing can be deform | transformed and an external flange part can be formed in opening of an external insulation member.
In addition, the present invention includes a separator, a positive electrode sheet and a negative electrode sheet disposed via the separator, and an electrolyte solution inside the battery case joined to the battery lid with electrode terminals of the present invention, and the electrode connection There are also a plurality of terminals, the packing, the internal insulation member, the external insulation member, and the external connection terminals, and the positive electrode sheet and the negative electrode sheet also provide sealed batteries that are joined to the different electrode connection terminals. .
According to the sealed battery of the present invention, a sealed battery with higher sealing performance can be provided.

Further, the present invention is a method for manufacturing a battery lid with an electrode terminal according to the present invention, wherein an inner opening of the cylindrical portion of the packing having an inner flange portion and a cylindrical portion, an opening of an inner insulating member, and a lid member Step of caulking the end of the rivet portion with the opening, the opening of the external insulating member, and the opening of the external connection terminal passing through the base and the rivet portion of the electrode connection terminal having a rivet portion protruding from the base portion In the step of caulking the end of the rivet portion, the rivet portion is joined to the external connection terminal, and the external connection terminal is pressed against the end of the cylindrical portion, whereby the end of the cylindrical portion is There is also provided a method of manufacturing a battery lid with electrode terminals that is deformed to form the external flange portion.
According to the method for manufacturing a battery lid with electrode terminals of the present invention, the end of the cylindrical portion can be deformed to form an external flange portion, preventing leakage of electrolyte inside the battery and intrusion of moisture from outside into the battery. A battery lid with electrode terminals that can be manufactured can be manufactured.

  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 plan 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 3 is an enlarged view of a range B surrounded by a dotted line in FIG. 2, and FIG. 4 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. A lid member 2 having an outer surface and an inner surface and having an opening; a packing 13 having a cylindrical portion 30, an inner flange portion 31, and an outer flange portion 43 penetrating the opening of the lid member 2, and a lid member; 2 is connected to the positive electrode sheet 21 or the negative electrode sheet 22. The electrode connection terminal includes a connecting part 16 for connecting to the positive electrode sheet 21 or the negative electrode sheet 22, and a rivet part 14 protruding from the base part 15 and penetrating through the opening inside the cylindrical part 30. 5 and an external connection terminal 8 joined to the rivet portion 14 on the outer surface side of the lid member 2, and the cylindrical portion 30 is in close contact with the side wall of the opening of the lid member 2 on the outer side, The inner flange portion 31 is directly sandwiched between the base portion 15 and the inner surface of the lid member 2, and the outer flange portion 43 is directly sandwiched between the external connection terminal 8 and the outer surface of the lid member 2. It is characterized by.
In addition, the battery lid 17 with electrode terminals of the present embodiment may include a plurality of packings 13, electrode connection terminals 5, and external connection terminals 8. The plurality of packings 13 include a positive electrode packing 13 a and a negative electrode packing 13 b. The plurality of electrode connection terminals 5 include 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 8a and a negative electrode external connection terminal 8b. It is.

Further, the battery terminal-attached battery lid 17 of the present embodiment may include a plurality of internal insulating members 11, external insulating members 10, and screw members 6, and the internal insulating members 11a for positive electrodes are included in the internal insulating members 11. And the negative electrode internal insulation member 11b, the plurality of external insulation members 10 include the positive electrode external insulation member 10a and the negative electrode external insulation member 10b, and the plurality of screw members 6 include the positive electrode screw member 6a. And a negative electrode screw member 6b.
Even if the positive electrode connection terminal 3, the positive electrode internal insulating 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 are combined into one set and integrated with the lid member 2. Even if 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 are combined into one set and integrated with the lid member 2. Good.
Below, each component of the battery cover 17 with an electrode terminal and a manufacturing method are demonstrated.

1. Electrode connection terminal The electrode connection terminal 5 protrudes from the base portion 15 disposed on the inner surface side of the lid member 2, the connection portion 16 for connection to the positive electrode sheet 21 or the negative electrode sheet 22, and the cylindrical portion 30. And the rivet portion 14 that is in close contact with the inner surface of the cylindrical portion 30. 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 is 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 rivet portion 14 can be formed by drawing.

The electrode connection terminal 5 has, for example, a structure as shown in FIGS. 2 and 3, 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 and 6B 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. .

2. Packing The packing 13 penetrates the opening 34 of the lid member 2 and is directly sandwiched between the cylindrical portion 30 that is in close contact with the side wall of the opening 34 of the lid member 2, the base portion 15 of the electrode connection terminal 5, and the inner surface of the lid member 2. 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.
The packing 13 may be plural, and the plural packings 13 include a positive electrode packing 13a and a negative electrode packing 13b. The rivet portion 14 of the positive electrode connection terminal 3 passes through the opening inside the cylindrical portion 30 of the positive electrode packing 13a, and the rivet of the negative electrode connection terminal 4 passes through the opening inside the cylindrical portion 30 of the negative electrode packing 13a. The part penetrates.
The positive electrode packing 13 a and the negative electrode packing 13 b pass through different openings 34 of the lid member 2.

The internal flange portion 31 of the positive electrode packing 13 a is directly sandwiched between the base portion 15 of the positive electrode connection terminal 3 and the inner surface of the lid member 2, and is in close contact with the base portion 15 of the positive electrode connection terminal 3 and the inner surface of the lid member 2. . The external flange portion 43 of the positive electrode packing 13 a is directly sandwiched between the positive electrode external connection terminal 8 a and the outer surface of the lid member 2, and is in close contact with the positive electrode external connection terminal 8 a and the outer surface of the lid member 2.
Further, the inner flange portion 31 of the negative electrode packing 13b is directly sandwiched between the base portion 15 of the negative electrode connection terminal 4 and the inner surface of the lid member 2, and is in close contact with the base portion 15 of the negative electrode connection terminal 4 and the inner surface of the lid member 2. . The external flange portion 43 of the negative electrode packing 13 b is directly sandwiched between the negative electrode external connection terminal 8 b and the outer surface of the lid member 2, and is in close contact with the negative electrode external connection terminal 8 b and the outer surface of the lid member 2.

  Further, the inner flange portion 31 and the outer flange portion 43 can form a protruding edge in the direction of the outside of the cylindrical portion 30, and the protruding end of the outer flange portion 43 is the outer periphery of the cylindrical portion 13 compared to the protruding end of the inner flange portion 31. It can be provided to be close to. Thus, the outer flange portion 43 can be easily formed by deforming a part of the packing. For example, as shown in FIG. 4, the distance a between the protruding end of the outer flange portion 43 and the outer periphery of the cylindrical portion 13 can be shorter than the distance b between the protruding end of the inner flange portion 31 and the outer periphery of the cylindrical portion 13.

  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.

  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.

  The packing 13 can have a structure as shown in FIGS. 3 and 4, for example. An inner flange portion 31 and an outer flange portion 43 are formed so as to sandwich the cylindrical portion 30, and the inner flange portion 31, the cylindrical portion 30, and the outer flange portion 43 are U-shaped, and the opening 34 of the lid member 2 is formed on the inner side. Is in close contact with the end of the film. Since the electrode connection terminal 5 and the external connection terminal 8 are integrated and pressed between the base portion 15 of the electrode connection terminal 5 and the external connection terminal 8, the U-shaped corner, that is, the dotted line in FIG. In both the enclosed corners D and E, the lid member 2 and the packing 13 can be more closely attached. For this reason, it can prevent that liquid, such as electrolyte solution distribute | circulates through the clearance gap between the cover member 2 and the packing 13, and can make the sealing performance of a battery higher.

  FIG. 5 is a schematic sectional view of a part of a conventional lid member with electrode terminals, and is a sectional view corresponding to FIG. The conventional packing 13 of the lid member with electrode terminal does not have the external flange portion 43, and the corner portion where the lid member 2 and the packing 13 are in close contact with each other is located at one corner F surrounded by the dotted line in FIG. Become. Therefore, the sealing battery using the battery lid 17 with electrode terminal of the present embodiment has higher sealing performance than the conventional sealing battery using the lid member with electrode terminal.

  FIG. 7A is a schematic top view of the packing 13 before the packing 13 is deformed at a stage before the rivet portion 14 of the electrode connection terminal 5 is joined to the external connection terminal 8, and FIG. FIG. 8 is a schematic cross-sectional view of the packing 13 taken along a dotted line GG in FIG. The unpacked packing 13 has a cylindrical portion 30 and an internal flange portion 31 around the opening 29.

3. Internal Insulating Member FIG. 8A is a schematic plan view of the internal insulating member 11, and FIG. 8B is a schematic cross-sectional view of the internal insulating member 11 taken along a dotted line HH in FIG.
The internal insulating member 11 is sandwiched between the base portion 15 of the electrode connection terminal 5 and the inner surface of the lid member 2 and has an opening 33. The rivet portion 14 of the electrode connection terminal 5 passes through the opening 33. Further, the inner flange portion 31 of the packing 13 may be formed in the opening 33. By providing the internal insulating member 11, the electrode connection terminal 5 and the lid member 2 can be provided in a non-contact manner, and leakage current can be prevented from flowing.
There may be a plurality of internal insulating members 11, and the internal insulating members 11 include a positive electrode internal insulating member 11a and a negative electrode internal insulating member 11b. The positive electrode internal insulation member 11a is sandwiched between the base 15 of the positive electrode connection terminal 3 and the inner surface of the lid member 2, and the negative electrode internal insulation member 11b is sandwiched between the base 15 of the negative electrode connection terminal 4 and the inner surface of the lid member 2. Is done.
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.

4). Lid Member FIG. 9A is a schematic plan view of the lid member 2, and FIG. 9B is a schematic cross-sectional view of the lid member 2 taken along a dotted line II in FIG. 9A.
The lid member 2 has an opening 34 through which the rivet portion 14 of the electrode connection terminal 5 and the cylindrical portion 30 of the packing 13 pass. The lid member 2 can be joined to the battery case 1 at the end.
The opening 34 of the lid member 2 may be plural. Further, the rivet portion 14 of the positive electrode connection terminal 3 and the rivet portion 14 of the negative electrode connection terminal 4 may pass through the two openings 34, respectively.
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 nickel, tin, chromium, zinc, etc. on the metal material, and materials such as hard plastics.

5. External Insulating Member FIG. 10A is a schematic plan view of the external insulating member 10, and FIG. 10B is a schematic cross-sectional view of the external insulating member 10 taken along a dotted line JJ in FIG.
The external insulating member 10 is sandwiched between the external connection terminal 8 and the outer surface of the lid member 2 and has an opening 35. The rivet portion 14 of the electrode connection terminal 5 passes through the opening 35. Further, an outer flange portion 43 of the packing 13 may be formed in the opening 35. By providing the external insulating member 10, the external connection terminal 8 and the lid member 2 can be provided in a non-contact manner, and leakage current can be prevented from flowing.
There may be a plurality of external insulating members 10, and the plurality of external insulating members 10 include a positive external insulating member 10a and a negative external insulating member 10b. The positive electrode external insulating member 10 a is sandwiched between the positive electrode external connection terminal 8 a and the outer surface of the lid member 2, and the negative electrode external insulating member 10 b is sandwiched between the negative electrode external connection terminal 8 b and the outer surface of the lid member 2. .
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.

6). External Connection Terminal The external connection terminal 8 is disposed on the outer surface side of the lid member 2 and is joined to the rivet portion 14 of the electrode connection terminal 5. 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.
A plurality of external connection terminals 8 may be provided, and the plurality of external connection terminals 8 include a positive electrode external connection terminal 8a and a negative electrode external connection terminal 8b. The positive external connection terminal 8 a is joined to the rivet portion 14 of the positive connection terminal 3, and the negative external connection terminal 8 b is joined to the negative connection terminal 4. Further, the positive electrode external connection terminal 8a can be bonded to the positive electrode screw member 6a, and the negative electrode external connection terminal 8b can be bonded to the negative electrode screw member 6b.
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. 11A 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. 11B is a dotted line K− in FIG. It is a schematic sectional drawing of the external connection terminal 8 in K. As shown in FIG. 11, 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 is directly sandwiched between the flat plate portion around the opening 36 and the outer surface of the lid member 2.

7). Screw member The screw member 6 passes through the opening 37 of the external connection terminal 8 and is joined to the external connection terminal 8. The screw member 6 may have a male screw structure. When the screw member 6 has a male screw structure, the external connection terminal 8 and the external wiring can be connected by penetrating the male screw structure through an opening of a metal plate serving as external wiring and fastening the male screw with a nut or the like.
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 the external connection terminal 8 is the cylindrical portion 30. 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 the end of the electrode portion and the external flange portion 43 is formed.

  FIG. 12 is an explanatory diagram for explaining a method of manufacturing the battery lid 14 with electrode terminals of the present embodiment. 12 is a stage before the rivet portion 14 of the electrode connection terminal 5 is joined to the external connection terminal 8, and 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. 12 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. 12, the rivet part 14 is deformed by performing a step of caulking the end of the rivet part 14 of the electrode connection terminal 5 using the mold 40 and the pressing member 41, and the rivet part 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 c of the rivet portion 14 shown in FIG. 6A (the distance r shown in FIG. 12), the diameter d of the opening 29 of the packing 13 shown in FIG. 7A (the distance shown in FIG. 12) r) and the diameter q (the distance r shown in FIG. 12) of the opening 36 of the external connection terminal 8 shown in FIG. 11 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 caulking the end of the rivet portion 14, the external connection terminal 8 can be brought into pressure contact with the end of the cylindrical portion 30 of the packing 13, and the cylindrical portion 30 can be deformed.

  The outer diameter f (distance s shown in FIG. 12) of the cylindrical portion 30 shown in FIG. 7A is equal to the diameter k (distance s shown in FIG. 12) of the opening 34 of the lid member 2 shown in FIG. It may be substantially the same. 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 g (the distance x shown in FIG. 12) of the internal flange portion 31 of the packing 13 shown in FIG. 7B is the thickness j (in FIG. 12) of the internal insulating member 11 shown in FIG. The outer diameter e (the distance u shown in FIG. 12) of the inner flange portion 31 of the packing 13 shown in FIG. 7A is thicker than the indicated distance z), and the inner insulating member shown in FIG. 11 may be smaller than the diameter i of the opening 33 (the distance v shown in FIG. 12). 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 h of the cylindrical portion 30 of the packing 13 shown in FIG. 7B (the distance w shown in FIG. 12) is the same as the thickness m of the lid member 2 shown in FIG. 9B and FIG. The outer diameter f of the cylindrical portion 30 of the packing 13 shown in FIG. 7A (the distance s shown in FIG. 12) is longer than the sum of the thickness p of the external insulating member 10 (the distance y shown in FIG. 12). ) May be smaller than the diameter n (distance t shown in FIG. 12) of the opening 35 of the external insulating member 10 shown in FIG. 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 the external flange portion 43 is 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 13 is a schematic top view of a sealed battery according to one embodiment of the present invention, FIG 14 is a schematic side view of a sealed battery according to one embodiment of the present invention. 15 is a schematic cross-sectional view of the sealed battery taken along a dotted line LL in FIG. 13, and FIG. 16 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 and the negative electrode sheet 22 are joined to the different electrode connection terminals 5, respectively. .

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. 16, the power generation element 12 is arranged in the bellows-folded separator 24, and in each valley groove of the separator 24, and the positive electrode sheet 21 and the negative electrode sheet 22 that are 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. 17A and 17B, 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.17 (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. 18A and 18B, and can be formed by forming the negative electrode active material layers 26 on both sides of the rectangular negative electrode current collector 28. The negative electrode sheet 22 can have a connection part 23 for connection to the negative electrode connection terminal 4, and the connection part 23 in FIG. 18A is provided on both surfaces of the negative electrode current collector 27 at the end of the negative electrode sheet 22. 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 electrolyte are accommodated therein. For example, aluminum, aluminum alloy, iron 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 8, 8a, 8b: External connection terminal 10, 10a, 10b: External insulation member 11 11a, 11b: Internal insulating 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: Opening 30: Cylindrical part 31: Internal flange part 38: External connection part 40: Mold 41: Member for pressing 43: External part Lung part

Claims (8)

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 an outer surface and an inner surface and having an opening, a packing having a cylindrical portion, an inner flange portion, and an outer flange portion penetrating the opening of the lid member, and disposed on the inner surface side of the lid member An electrode connection terminal having a base, a connecting part for connecting to the positive electrode sheet or the negative electrode sheet, and a rivet part protruding from the base part and penetrating through an opening inside the cylindrical part; and the rivet on the outer surface side of the lid member An external connection terminal to be joined to the part,
The cylindrical portion is in close contact with the side wall of the opening of the lid member on the outside, and is in close contact with the rivet portion on the inside,
The internal flange is directly sandwiched between the base and the inner surface of the lid member,
The battery lid with electrode terminals, wherein the external flange portion is directly sandwiched between the external connection terminal and an outer surface of the lid member.   The battery cover according to claim 1, wherein the external connection terminal has an opening through which the rivet portion passes, and is joined to the rivet portion by caulking an end of the rivet portion.   The battery lid according to claim 1, wherein the packing is made of a fluororesin. An internal insulating member sandwiched between the base of the electrode connection terminal and the inner surface of the lid member and having an opening, and an external insulating member sandwiched between the external connection terminal and the outer surface of the lid member and having an opening And further comprising
The rivet portion penetrates the opening of the inner insulating member and the opening of the outer insulating member,
The internal flange portion is provided in an opening of the internal insulating member,
The battery cover according to claim 1, wherein the outer flange portion is provided in an opening of the external insulating member. The inner flange portion is in close contact with the side wall of the opening of the inner insulating member,
The battery cover according to claim 1, wherein the outer flange portion is in close contact with a side wall of an opening of the outer insulating member.   The battery cover according to claim 5, wherein the opening of the external insulating member has a diameter larger than the outer diameter of the cylindrical portion of the packing. Inside the battery case joined to the battery lid according to any one of claims 4 to 6, comprising a separator, a positive electrode sheet and a negative electrode sheet arranged via the separator, and an electrolyte solution,
The electrode connection terminal, the packing, the internal insulation member, the external insulation member, and the external connection terminal are each plural.
The said positive electrode sheet and the said negative electrode sheet are the sealed batteries which joined to the said different electrode connection terminal, respectively. It is a manufacturing method of the battery lid according to any one of claims 4 to 6,
The inner opening of the cylindrical portion of the packing having the inner flange portion and the cylindrical portion, the opening of the inner insulating member, the opening of the lid member, the opening of the outer insulating member, and the opening of the external connection terminal, the base and the A step of caulking an end of the rivet portion in a state in which the rivet portion of the electrode connection terminal having a rivet portion protruding from the base is penetrated,
In the step of caulking the end of the rivet portion, the rivet portion is joined to the external connection terminal, and the external connection terminal is pressed against the end of the cylindrical portion, whereby the end of the cylindrical portion is deformed and the A method of manufacturing a battery lid with electrode terminals in which an external flange portion is formed.

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