CN202817068U - Lead component - Google Patents

Abstract

The utility model provides a lead part, which is composed of a nickel-plated copper flat conductor without cut off flash. The lead part (3) is formed by pasting the insulating resin film (5) on both sides of the nickel-plated flat conductor (4). In this lead part (3), as the flat conductor (4), the soft A circular copper conductor is rolled and flattened so that the conductor width is 40 times or more the conductor thickness, and the rolled conductor surface is plated with nickel (7). In this lead member, there is no burr at the edge of the nickel-plated copper flat conductor, and the metal foil is not cut by the burr.

Description

Lead parts

technical field

The utility model relates to a nickel-plated lead wire component used in non-aqueous electrolyte batteries and the like.

Background technique

As a power source of a small electronic device, for example, a nonaqueous electrolyte battery such as a lithium ion battery is used. As this non-aqueous electrolyte battery, there is known a structure in which a positive electrode plate, a negative electrode plate, and an electrolytic solution are accommodated in a package made of a multilayer film, and a lead member connected to the positive electrode plate and the negative electrode plate is sealed. encapsulated, and protrudes outward. As the multilayer film forming the package, a highly airtight multilayer film is used in which at least a metal foil layer made of metal such as aluminum is sandwiched between the innermost layer film and the outermost layer film.

The lead parts are hermetically sealed with an insulator, but during long-term use, hydrofluoric acid is generated when moisture enters the battery and reacts with the electrolyte. The lead member has a tab shape using a flat metal conductor, and aluminum, nickel (including nickel plating), copper, etc. are used as the metal conductor, but copper metal conductors are often used on the negative electrode side. Since nickel metal is hardly corroded by hydrofluoric acid, when copper having excellent conductivity is used as a metal conductor of a lead member, it is used as nickel-plated copper after nickel plating (for example, refer to Patent Document 1).

In addition, as a method of forming a nickel-plated flat conductor, a method is known in which a nickel-plated annealed copper round wire is drawn into a square or rectangular quadrilateral, and rolled to form a relatively flat conductor. thin flat shape to form a conductor of a flexible flat cable (for example, refer to Patent Document 2).

Patent Document 1: Japanese Unexamined Patent Publication No. 2010-33888

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

Utility model content

The flat metal conductors (hereinafter referred to as flat conductors) of lead parts used in non-aqueous electrolyte batteries are usually formed by cutting a wide conductor foil into tab shapes, plating, and pasting an insulating film on the packaging part. forming. In the case of using nickel-plated copper as a flat conductor of a lead member as disclosed in Cited Document 1, the soft copper conductor foil is cut and shaped, but cutting burrs or cutting edges may sometimes occur during cutting. dust. When the lead member is connected to the metal foil as an electrode, the metal foil may be damaged by cutting burrs, so that electric power cannot be taken out, and it cannot be used as a battery.

In addition, Cited Document 2 discloses a method of rolling and forming a nickel-plated annealed copper round wire, in which a flat conductor having a conductor width about 10 times the conductor thickness (for example, a conductor thickness of 0.035 mm) is disclosed. mm, the conductor width is 0.3mm to 0.4mm), that is, the conductors for flexible flat cables. On the other hand, for the flat conductors of the lead parts used in non-aqueous electrolyte batteries, if the conductor thickness is 0.1 mm, the conductor width is 4 mm to 7 mm, and the conductor width is about 40 to 70 times the conductor thickness. In Cited Document 2, the aforementioned wide flat conductor is not conceived, and rolling in a plated state is difficult.

The utility model is proposed in view of the above-mentioned actual situation, and its purpose is to provide a lead part made of a flat conductor without cutting flash.

The lead part according to the present invention is formed by pasting insulating resin films on both sides of a nickel-plated flat conductor, and is characterized in that the flat conductor is a round conductor of soft copper or aluminum rolled Instead, it is flattened so that the width of the conductor is greater than or equal to 40 times the thickness of the conductor, and nickel plating is performed on the surface of the rolled conductor.

The effect of utility model

According to the present invention, there is no burr at the edge of the nickel-plated flat conductor of the lead member, and when the lead member is connected to the metal foil as an electrode, the metal foil will not be cut off by the burr to generate electric power. not available.

Description of drawings

FIG. 1 is a diagram showing an example in which the lead member of the present invention is used in a nonaqueous electrolyte battery.

Fig. 2 is a diagram illustrating an example of a lead member of the present invention.

FIG. 3 is a diagram illustrating an outline of a method of manufacturing a lead member of the present invention.

Detailed ways

The outline of the lead member according to the present invention and an example of its use in a nonaqueous electrolyte battery will be described with reference to FIG. 1 . FIG. 1(A) is a diagram showing the appearance of a non-aqueous electrolyte battery, and FIG. 1(B) is a diagram showing a sealed state of a lead member. In the figure, 1 denotes a non-aqueous electrolyte battery, 2 denotes a package, 2a denotes an innermost film, 2b denotes a metal foil layer, 2c denotes an outermost film, 3 denotes a lead part, 4 denotes a flat conductor, and 5 denotes an insulating resin In the film, 5a indicates the inner layer, 5b indicates the outer layer, 6 indicates the sealing part, and 7 indicates the nickel plating layer.

The non-aqueous electrolyte battery 1 is constituted such that a stacked electrode group formed by laminating a positive electrode plate and a negative electrode plate with a separator interposed therebetween and an electrolytic solution are accommodated in a package made of a multilayer film including metal foil.

In the package 2 , as shown in FIG. 1(A) , the lead member 3 connected to the electrode plate protrudes from the sealing portion 6 of the package 2 via the insulating resin film 5 in a hermetically sealed state. The multilayer film of the package 2 is formed by adhering a resin film on at least both sides of a metal foil as will be described later.

The package 2 serves as an outer casing of the non-aqueous electrolyte battery 1 , and is sealed by thermally welding sealing portions 6 around two rectangular multilayer films, for example. As for the lead member 3, as shown in FIG. 1(B), an insulating resin film 5 is previously bonded to the flat metal conductor 4 by heat welding, and the insulating resin film 5 and the multilayer film of the package body 2 are heated to The lead member 3 and the multilayer film are sealed by welding.

As the flat metal conductor (hereinafter referred to as flat conductor) 4 , a conductor having a thickness of 0.05 mm to 0.4 mm is used. The conductor width of the flat conductor of the utility model is greater than or equal to 40 times of the thickness. Conductor width up to 100mm. The flat conductor 4 is used as a terminal conductor, and an insulating resin film 5 is pasted on the portion of the flat conductor 4 protruding from the package 2 . The insulating resin film 5 is aligned and pasted on both surfaces of the flat conductor. As the insulating resin film 5 , a resin film shorter in length and larger in width than the flat conductor is used.

The insulating resin film 5 can be formed of two layers, for example, an inner layer 5a bonded or welded to both sides of the flat conductor 4 of the lead member 3 connected to the electrode plate, and an outer layer 5b connected to the package. Body 2 is welded. The inner layer 5a is heated and melted in advance to be in close contact with the flat conductor 4 to form a good hermetic seal at the conductor boundary. The outer layer 5b is made of a material with a higher melting point than the inner layer 5a, and the shape is maintained without melting when the inner layer 5a and the flat conductor 4 are hermetically sealed. In addition, when sealing with the package 2 , by welding the outer layer 5 b to the package 2 , an electrical short circuit between the metal foil 2 b and the flat conductor 4 in the package 2 can be prevented.

The multilayer film forming the package 2 is composed of at least three laminated bodies, and polyolefin resin ( such as maleic anhydride modified low density polyethylene or polypropylene). The metal foil layer 2b uses a metal foil such as aluminum, copper, or stainless steel with a thickness of about 10 μm to improve the sealing performance against the electrolytic solution. The outermost film 2c is a member for protecting the thin metal foil layer 2b, and is formed of polyethylene terephthalate (PET) or the like.

In addition, a lead member made of aluminum metal is used on the positive electrode side of the non-aqueous electrolyte battery 1 , and a lead member made of nickel-plated copper or nickel-plated aluminum according to the present invention is used on 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. As will be described later, the flat conductor 4 is formed flatly by rolling soft copper or aluminum conductors with a circular cross section, so both ends 4 a in the lateral direction (width direction) are formed in a shape in which the circle is flattened. A smooth shape with rounded corners and no corners. That is, it is possible to form a flat conductor without cutting burrs generated when the conductor foil is cut. The surface of the copper or aluminum flat conductor 4 without burrs is plated with nickel to cover it with the nickel plating layer 7 , and the above-mentioned insulating resin film 5 is pasted to form the lead member 3 .

When the lead member 3 is assembled as an electrode terminal of the non-aqueous electrolyte battery 1 as shown in FIG. 1 , both ends 4 a of the flat conductor 4 form smooth edges with no burrs and rounded corners. Therefore, the metal foil 2 b of the package 2 and the like are not damaged, and an electrical short circuit does not occur between the flat conductor 4 and the metal foil 2 b of the package 2 .

FIG. 3 is a diagram showing an example of a method of manufacturing the above-mentioned lead member 3 . First, as shown in FIG. 3(A), a soft copper or aluminum circular conductor 4' (wire shape) having a predetermined outer diameter (or cross-sectional area) is prepared. This circular conductor 4' is flattened by a calender roll 8, for example, as shown in Fig. 3(B) . In addition, in the present invention, it is preferable to perform rolling so that the conductor width W becomes approximately 50 to 70 times the conductor thickness t, and form the flat conductor 4 . In addition, the rolling is carried out so that both end portions 4 a in the width of the conductor remain rounded.

Then, as shown in FIG. 3(C) , nickel plating is performed on the surface of the flat conductor 4 to cover it with the nickel plating layer 7 . This plating treatment may be performed by passing the rolled long linear flat conductor 4 through the plating solution, or may be performed after cutting into a predetermined length of flat conductor as a lead member.

Then, an insulating resin film 5 is attached to a predetermined portion of the flat conductor 4 covered with the nickel plating layer 7 . When the flat conductor 4 is plated without cutting, the insulating resin film 5 is bonded to the elongated flat conductor 4 at intervals, and then cut at a predetermined position to form a lead member.

A soft copper circular conductor was rolled to form a flat conductor with a thickness of 0.1 mm and a width of 4.0 mm (the conductor width is 40 times the conductor thickness), and nickel plating was performed on the flat conductor. In addition, a soft copper round conductor was rolled to form a flat conductor with a thickness of 0.1 mm and a width of 100 mm (the conductor width is 1000 times the conductor thickness), and nickel plating was performed on the flat conductor. Both surfaces of the nickel-plated flat conductor were bonded with an insulating resin film as shown in FIG. 3(D) to form a lead member.

The above-mentioned lead member is connected to a metal foil serving as an electrode having a thickness of 0.01 mm, and since the lead member has no burrs, the metal foil is not cut.

The copper foil of thickness 0.1mm was cut|disconnected, and it divided|segmented into the flat conductor of width 4.0mm. Nickel plating was performed on this copper foil. The plated flat conductor has a maximum flash of 0.03mm. The lead member having the flash was connected to a metal foil serving as an electrode having a thickness of 0.01. The metal foil may be cut by the flash. If the foil is cut, power cannot be taken out of the battery.

Claims (5)

1. lead member, its two sides at the strap of having implemented nickel plating is pasted insulating resin film and is formed,

It is characterized in that,

As described strap, be round conductor is rolled and to make conductor width more than or equal to 40 times of conductor thickness, and the conductive surface after calendering is implemented nickel plating and is formed.

2. lead member according to claim 1 is characterized in that,

The thickness of described strap is 0.05mm～0.4mm.

3. lead member according to claim 1 is characterized in that,

The conductor width of described strap is 40～1000 times of conductor thickness.

4. lead member according to claim 1 and 2 is characterized in that,

Described strap is implemented nickel plating at the Copper Foil that the annealed copper wire calendering is formed and is formed into.

5. lead member according to claim 1 and 2 is characterized in that,

Described strap is implemented nickel plating at the aluminium foil that the aluminum steel calendering is formed and is formed into.

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