TWM445271U - Lead member - Google Patents

Description

Lead member

The present invention relates to a lead member for nickel plating which is used in a nonaqueous electrolyte battery or the like.

As a power source of a small electronic device, for example, a nonaqueous electrolyte battery such as a lithium ion battery is used. In the non-aqueous electrolyte battery, a positive electrode plate, a negative electrode plate, and an electrolytic solution are housed in a sealed body composed of a multilayer film, and a lead member sealed and sealed to a positive electrode plate or a negative electrode plate is sealed and taken out to the outside. . The multilayer film forming the encapsulating body is a multilayer film having a high sealing property in which a metal foil layer composed of at least a metal such as aluminum is bonded to the innermost film and the outermost film in a sandwich shape.

The lead member is hermetically sealed by an insulator, but due to long-term use, moisture permeates into the battery and reacts with the electrolytic solution to cause hydrofluoric acid. The lead member is in the shape of a tab using a flat metal conductor, and aluminum, nickel (including nickel plating), copper or the like is used as the metal conductor thereof, but a metal conductor of copper is often used on the negative electrode side. Since nickel metal is hardly corroded by hydrofluoric acid, nickel plating with nickel plating is used for the case where copper having good conductivity is used for the metal conductor of the lead member (for example, see Patent Document 1).

Further, as a method of forming a rectangular conductor having nickel plating, it is known that a soft copper wire having a nickel plating is formed into a square or a rectangular quadrilateral shape, and is rolled into a thin flat (flat) shape to be flexible. A conductor of a flexible flat cable (for example, refer to Patent Document 2).

Patent Document 1: Japanese Laid-Open Patent Publication No. 2010-33888

Patent Document 2: Japanese Laid-Open Patent Publication No. 2009-117275

A flat metal conductor (hereinafter referred to as a flat conductor) used for a lead member of a nonaqueous electrolyte battery is usually formed by cutting a wide conductor foil into a flat shape, and after plating, attaching an insulating film to the sealed portion. form. As disclosed in the cited document 1, in the case of using a nickel-plated copper as a flat conductor of a lead member, it is formed by cutting a soft copper conductor foil, but there is a case where the cut burr or the powder is cut off at the time of cutting. . When the lead member is connected to the metal foil serving as an electrode, the burr may be broken to damage the metal foil, and the electric power may not be taken out, so that it cannot be used as a battery.

Further, in the cited document 2, a method of forming a soft copper round wire which is subjected to nickel plating is disclosed, and a rectangular conductor having a conductor width of 10 times the conductor thickness (for example, a conductor thickness of 0.035 mm, a conductor width) is disclosed. It is 0.3 mm to 0.4 mm) and is used as a conductor for flexible flat cables. On the other hand, the flat conductor used for the lead member of the nonaqueous electrolyte battery has a conductor thickness of 0.1 mm and a conductor width of 4 mm to 7 mm, and the conductor width is 40 to 70 times the conductor thickness. In the cited document 2, such a wide-angled rectangular conductor is not assumed, and it is difficult to perform calendering in a plated state.

This creation is based on the above actual situation and is completed by A lead member formed by cutting a flat conductor of a burr.

The lead member of the present invention is formed by bonding an insulating resin film on both sides of a nickel-plated flat conductor, and is characterized in that the flat guiding system is used to calender a soft copper or aluminum round conductor, and the conductor width becomes a conductor thickness. The method of flattening 40 times or more becomes flat, thereby performing nickel plating on the surface of the conductor after rolling.

According to the present invention, the edge portion of the lead member having the nickel-plated flat conductor is free of burrs, and there is no case where the metal foil is cut by the burr when the lead member is connected to the metal foil serving as the electrode, so that the use cannot be used. The electricity produced.

The outline of the lead member of the present invention and the use example of the nonaqueous electrolyte battery will be described based on Fig. 1 . Fig. 1(A) is a view showing the appearance of a nonaqueous electrolyte battery, and Fig. 1(B) is a view showing a state in which a lead member is sealed. As shown in the figure, 1 is a non-aqueous electrolyte battery, 2 is an enclosed body, 2a is an innermost layer film, 2b is a metal foil layer, 2c is an outermost layer film, 3 is a lead member, 4 is a flat conductor, and 5 is an insulation. The resin film 5a is an inner layer, 5b is an outer layer, 6 is a sealing portion, and 7 is a nickel plating layer.

The non-aqueous electrolyte battery 1 is a laminated electrode group in which a positive electrode plate and a negative electrode plate layer are stacked by a separator, and an electrolyte solution, and is housed in a sealed body 2 composed of a multilayer film including a metal foil, as shown in FIG. 1 (A). As shown in the figure, the lead member 3 connected to the electrode plate is taken out from the sealing portion 6 of the sealing body 2 in a sealed and sealed state by the insulating resin film 5. Sealing the multilayer film of body 2, as after It is formed by bonding a resin film to at least the both surfaces of a metal foil.

The sealed body 2 is a case in which the casing is attached to the nonaqueous electrolyte battery 1, and is sealed, for example, by sealing the sealing portion 6 around the multilayer film of two rectangular shapes by heat fusion. As shown in FIG. 1(B), the lead member 3 is formed by previously bonding the insulating resin film 5 to the flat metal conductor 4 by heat fusion, and heat-melting the insulating resin film 5 and the multilayer film of the sealed body 2. The lead member 3 is sealed with the multilayer film.

A flat metal conductor (hereinafter referred to as a flat conductor) 4 is used in a thickness of 0.05 mm to 0.4 mm. The width of the conductor of the flat conductor of the present invention is more than 40 times the thickness. The conductor width is up to 100 mm. The flat conductor 4 is used as a terminal conductor, and the insulating resin film 5 is attached to the taken-out portion of the sealed body 2 of the flat conductor 4. The insulating resin film 5 is bonded to the both sides of the flat conductor. The insulating resin film 5 is shorter in length than the flat conductor and wider than the width of the flat conductor.

The insulating resin film 5 can be formed, for example, of two layers of the inner layer 5a and the outer layer 5b, which are then or fused to both sides of the flat conductor 4 of the lead member 3 connecting the electrode plates, and the outer layer 5b is sealed and sealed. Body 2 melts. The inner layer 5a is adhered to the flat conductor 4 by heating and melting in advance, thereby forming a good sealing seal of the conductor interface in advance. The outer layer 5b has a higher melting point than the inner layer 5a, and retains its shape so as not to melt when it is hermetically sealed with the flat conductor 4. Therefore, when sealing with the sealing body 2, the outer layer 5b and the sealing body 2 are fused, whereby the metal foil layer 2b and the flat conductor 4 in the sealing body 2 can be electrically short-circuited.

The multilayer film forming the encapsulant 2 is composed of a laminate of at least three layers In the innermost layer film 2a, a polyolefin resin (for example, maleic anhydride-modified low-density polyethylene or polypropylene) is used as a suitable one for preventing the electrolyte from leaking from the sealing portion 6 without being dissolved by the electrolytic solution. The metal foil layer 2b is made of a metal foil such as aluminum, copper or stainless steel having a thickness of about 10 μm to improve the sealing property to the electrolytic solution. The outermost layer film 2c is formed to protect the thin metal foil layer 2b, and is formed of polyethylene terephthalate (PET) or the like.

Further, a lead member made of aluminum metal was used for the positive electrode side of the nonaqueous electrolyte battery 1, but the lead member made of nickel plated copper or nickel plated aluminum was used for the negative electrode side.

Fig. 2 shows an example of the lead member 3 of the present invention. Fig. 2(A) shows a longitudinal section, and Fig. 2(B) shows a transverse section. The flat conductor 4 is formed by flattening a soft copper or aluminum conductor having a circular cross section as will be described later. Therefore, both end portions 4a in the lateral direction (width direction) have a rounded shape without a corner. Smooth shape. That is, a flat conductor that cuts the burrs can be produced without cutting the conductor foil. Nickel plating is applied to the surface of the flat conductor 4 of copper or aluminum without the burrs, and the nickel plating layer 7 is coated, and the insulating resin film 5 is attached as the lead member 3.

When the lead member 3 is used as an electrode terminal of the nonaqueous electrolyte battery 1 and assembled as shown in Fig. 1, the both end portions 4a of the flat conductor 4 are smooth edges with a non-burring arc. Therefore, the metal foil layer 2b of the sealed body 2 or the like is not damaged, and the electrical short circuit between the flat conductor 4 and the metal foil layer 2b of the sealed body 2 is not caused.

Fig. 3 is a view showing an example of a method of manufacturing the lead member 3; formula. First, as shown in Fig. 3(A), a circular conductor 4' (linear shape) of soft copper or aluminum having a predetermined outer diameter (or sectional area) is prepared. The circular conductor 4' is flattened by, for example, a calender roll 8 as shown in Fig. 3(B). Further, in the present invention, it is preferable to perform rolling so as to have a conductor width W of 50 to 70 times the thickness T of the conductor to form the flat conductor 4. Further, both end portions 4a of the conductor width are rolled so as to leave an arc.

Then, as shown in FIG. 3(C), the surface of the flat conductor 4 is subjected to a nickel plating treatment, and the nickel plating layer 7 is coated. In the plating treatment, the flat conductor 4 having a long line shape after rolling may be passed through a plating bath, or a flat conductor having a predetermined length as a lead member may be cut and then plated.

Thereafter, the insulating resin film 5 is attached to a predetermined portion of the flat conductor 4 covered by the nickel plating layer 7. When the flat conductor 4 is not cut and subjected to a plating treatment, the insulating resin film 5 is intermittently attached to the long flat conductor 4, and then cut at a predetermined position to become a lead member.

A flat conductor of a thickness of 0.1 mm and a width of 4.0 mm (the conductor width is 40 times the thickness of the conductor) is rolled and rolled with nickel. Further, a round conductor of soft copper was rolled to form a flat conductor having a thickness of 0.1 mm and a width of 100 mm (the conductor width was 1000 times the thickness of the conductor), and nickel plating was performed thereon. As shown in Fig. 3(D), an insulating resin film is bonded to both surfaces of the flat conductor on which nickel plating is applied to form a lead member.

These lead members are connected to a metal foil as an electrode having a thickness of 0.01 mm, and since the lead member has no burrs, there is no case where the metal foil is cut.

A copper foil having a thickness of 0.1 mm was cut and cut into flat conductors having a width of 4.0 mm. The copper foil is plated with nickel. The plated flat conductor has a burr of up to 0.03 mm. The lead member having the burr was attached to a metal foil as an electrode having a thickness of 0.01 mm. There is a case where the metal foil is cut due to the burrs. Once the metal foil is cut, power cannot be taken out of the battery.

1‧‧‧Non-aqueous electrolyte battery

2‧‧‧Enclosed body

2a‧‧‧ innermost film

2b‧‧‧metal foil layer

2c‧‧‧ outermost film

3‧‧‧ lead members

4‧‧‧ flat conductor

4a‧‧‧End

4'‧‧‧ Round conductor

5‧‧‧Insulating resin film

5a‧‧‧ inside layer

5b‧‧‧Outer layer

6‧‧‧ Sealing Department

7‧‧‧ Nickel plating

8‧‧‧calender roll

Fig. 1 is a view showing an example in which the lead member of the present invention is used for a nonaqueous electrolyte battery.

Fig. 2 is a view showing an example of a lead member of the present invention.

Fig. 3 is a schematic view showing a method of manufacturing the lead member of the present invention.

3‧‧‧ lead members

4‧‧‧ flat conductor

4a‧‧‧End

5‧‧‧Insulating resin film

5a‧‧‧ inside layer

5b‧‧‧Outer layer

7‧‧‧ Nickel plating

Claims (5)

A lead member is formed by laminating an insulating resin film on both sides of a flat conductor with nickel plating, wherein the flat guiding system is used to roll a round conductor so that the conductor width is 40 times or more of the thickness of the conductor, and is rolled. The surface of the conductor behind is nickel plated. The lead member of claim 1, wherein the flat conductor has a thickness of 0.05 mm to 0.4 mm. The lead member of claim 1, wherein the flat conductor has a conductor width of 40 to 1000 times the thickness of the conductor. The lead member according to claim 1 or 2, wherein the flat guide system is made of a nickel-plated copper foil obtained by rolling a soft copper wire. The lead member according to claim 1 or 2, wherein the flat guide system is made of a nickel plated aluminum foil obtained by rolling an aluminum wire.