JP2001229741A - Wiring material and its manufacturing method, and wiring parts by means thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wiring material available for battery pack or the like and its manufacturing method, and wiring parts by means thereof. SOLUTION: A plurality of heterogeneous conductive materials composed of conductive materials 5, 6 that metal-weldable and an conductive material 4 with a high conductivity are united in parallel to constitute a wiring material 7, on which punching process is conducted to form a wiring component that terminal parts 2, 3 are joined in a body at the both ends of an conductive portion 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiring material which can be suitably used for a battery pack and the like, a method of manufacturing the same, and a wiring component using the same.

[0002]

2. Description of the Related Art Secondary batteries used for secondary battery packs for mobile phones are classified into nickel-cadmium batteries, nickel batteries, lithium batteries and the like. A typical example of such a battery pack is a lithium prismatic battery as shown in FIG. 4, and the prior art will be described below using this example as a representative.

As shown in FIG. 4, a battery pack is mainly composed of a secondary battery body 10, a battery protection circuit 11 having a control component mounted on a circuit board, a battery protection component 17, and a wiring component from the battery positive electrode. 12 and a wiring component 13 serving as a negative lead from the battery negative electrode. The wiring component 13 is connected to a lead plate 14 and a wiring component 15 connected to a terminal portion 16 joined to the battery negative electrode side. The outer surface or both surfaces of the lead plate 14 has an insulating material 18 coated with a suitable material.

Here, among the above-mentioned components, the wiring component 13 and the wiring component 15 serving as negative leads are connected to the battery body 10 and the battery protection circuit 11, so that the means is not a means such as soldering. Generally, electrical connection is achieved by means such as spot welding.

Therefore, the wiring component 13 and the wiring component 1
For the wire 5, it is necessary to select a material such as an iron material or a nickel material that can be welded. Conventionally, a wiring integrally formed of a single material including the lead plate 14 by punching and forming the material. Parts have been used. However, a material that can be welded generally has a high electric resistance. For example, in the case of a nickel material, the resistance value is 23%, which is considerably higher than that of a pure copper material used as a normal wiring material.

On the other hand, in recent years, portable telephones and the like have been rapidly becoming smaller, lighter and thinner, and accordingly, battery packs to be mounted have become lighter and thinner. Lightening and miniaturization of the external shape are achieved. In particular, as the external shape of the battery becomes thinner, the wiring component 15 and the lead plate 14, which become the negative lead from the battery negative electrode, need to be formed to have a width not exceeding the thickness of the battery main body 10. The width of the conductor becomes narrower.

Therefore, from such a viewpoint, a wiring component as shown in FIGS. 5, 6 and 7 has been considered. This wiring part uses a material having high conductivity, such as pure copper or aluminum, as the lead plate 14, and uses a pure nickel material that can be welded to both ends of the lead plate 14 to form a wiring as a tab terminal. The parts 13 and the wiring parts 15 are formed separately, and the wiring parts 13 and the wiring parts 15 and the lead plate 14 are integrally formed by means such as welding or soldering as shown in FIGS. By doing so, there is a wiring component having two component functions of good conductor and easy welding to other components. Here, reference numerals 18 and 19 in FIG.
2 shows an insulating material for insulatingly covering both sides of the plate 14.

However, a wiring component having a structure has low reliability in connection between a wiring component as a tab terminal and a lead plate, so that the reliability of the component is poor, and it is necessary to manufacture three types of components, and the initials are required. In addition to the high cost, the connecting parts are small, so the work cost for integration is high, the work is difficult, mass production is difficult, and the parts are thickened because three parts are overlapped. was there.

In view of the foregoing, the present invention provides a battery pack or the like which is reduced in thickness, so that the conductivity can be improved as much as possible with a limited space, and component wiring is easy, inexpensive, and mass production is possible. And a method for manufacturing the same, and a wiring component using the same.

[0010]

Therefore, in the wiring material of the present invention, a metal-weldable conductive material such as iron, iron alloy, nickel or nickel alloy and a conductive material having high conductivity such as copper or copper alloy are used. A plurality of dissimilar conductive materials made of materials are integrally joined in parallel.

Further, as a method of manufacturing such a wiring material, a plurality of different conductive materials made of the above-described materials are welded in parallel by means such as electron beam welding, integrated and joined, and then rolled. Preferably, a step of adding an annealing treatment after the rolling is employed.

Here, by covering both sides or one side of the wiring material with an insulating material except for a terminal portion thereof,
A wiring component used for wiring such as a secondary battery pack can also be configured.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in further detail with reference to the illustrated embodiments. 1 and 2 are a schematic plan view and a cross-sectional view of a wiring component configured according to the present invention. A conductive portion 1 made of a conductive material having high conductivity such as copper or a copper alloy is, for example, It is formed to be elongated with a width not exceeding the thickness of the secondary battery body.

Reference numerals 2 and 3 denote terminal portions which are welded to both end surfaces of the conductive portion 1 by an electron beam welding means called EB welding, as shown in FIG. Alloy, pure nickel or a nickel alloy or other metal-weldable conductive material.
Therefore, this wiring component can be formed to a uniform thickness as shown in FIG.

Such a wiring component is formed by coating a suitable insulating material (not shown) on both sides or one side of the conductive portion 1 except for a part of the terminal portions 2 and 3 which can be spot-welded. Can be suitably used as an integrated minus lead.

FIG. 3 shows a strip-shaped wiring material 7 used for constituting the above-mentioned wiring component. The conductive material 4 having high conductivity such as pure copper or copper alloy is disposed at the center thereof. The end faces of the strip-shaped conductive materials 5 and 6 which can be welded with metal, such as iron, iron alloy, pure nickel or nickel alloy, and have high corrosion resistance are abutted to both end faces of 4 and integrally formed in parallel by electron beam welding means. Rolled to a certain thickness.

When this wiring material 7 is used, a punching process is performed as shown by the imaginary line in FIG. 3 while sequentially taking out the appropriately wound material, so that the wiring parts shown in FIGS. 1 and 2 can be easily mass-produced. Can be

In order to manufacture such a wiring material 7, the conductive materials 4, 5 and 6 are cut into strips having a required width.
At the stage where these conductive materials have been subjected to the end face treatment, conductive materials 5 and 6 are continuously and individually applied to both end surfaces of the conductive material 4.
After welding, the rolls are sequentially rolled, and then, preferably in the case where an annealing treatment is to be applied, the rolls are rolled again thereafter, and thereafter, the whole is cut into a predetermined width and then, for example, is applied to a tension leveler or the like. Can be obtained.

As described above, after the conductive materials 4, 5, and 6 made of thin materials are continuously welded by the electron beam welding means, they are rolled, subjected to an annealing step, and subjected to a final rolling step. , The welding reliability between the materials is high, and a diffusion phenomenon can be expected at the connection interface between the materials by adding the annealing step, so that the connection reliability is further improved.

1 and 2 formed by using the wiring material 7 as described above are composed of the terminals 2 and 3 for maintaining connection reliability and a good conductor at the center. By integral formation with a certain conductive portion 1, for example, a voltage drop in a lead wire from a battery negative electrode can be kept to a minimum.

In the case of a battery pack as shown in FIG. 4, one terminal may be soldered to another component, depending on the method of using the components. Instead, a nickel material may be used only for the remaining terminal portions, and the area excluding the terminal portions may be made of copper or a copper alloy.

Also, in the battery pack shown in FIG. 4, the wiring component of the present invention is often adjacent to the battery body, so that a part of the terminal parts 2, 3 connected to the counterpart component is included as a short-circuit prevention measure. It is essential to coat both sides or one side of the conductive portion 1 with an appropriate insulating material. Further, the wiring component integrated as described above may be formed on the material surface by nickel plating, solder plating, tin plating, or the like, if necessary. Surface treatment can also be performed.

[0023]

According to the wiring material and the method of manufacturing the same and the wiring component using the same according to the present invention, they are integrally formed at the time of the material and have high connection reliability between different kinds of materials. Since only the contact material is formed by punching, wiring components can be mass-produced at low cost.

Since such a wiring component is formed integrally, the thickness of the component can be minimized. In addition, the wiring material of the present invention can be used in various types such as a minus lead of a secondary battery pack depending on the application. Can be configured at low cost.

[Brief description of the drawings]

FIG. 1 is a conceptual plan view of a wiring component configured according to the present invention.

FIG. 2 is a sectional configuration view thereof.

FIG. 3 is a conceptual perspective view of a wiring material formed according to the present invention.

FIG. 4 is a conceptual perspective view showing an example of a secondary battery pack.

FIG. 5 is a conceptual exploded perspective view of a wiring component according to a conventional example.

FIG. 6 is a conceptual plan view of a conventional wiring component.

FIG. 7 is a cross-sectional configuration diagram thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Conductive part 2 Terminal part 3 Terminal part 4 Conductive material with high conductivity 5 Conductive material that can be welded to metal 6 Conductive material that can be welded to metal 7 Wiring material

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4E066 CA15 CA21 CB00 5G307 CA07 CB02 CC02 5G311 CA05 CB01 CC07 CD03 5H040 AA02 AA07 AS12 AT02 DD07 DD09

Claims (10)

[Claims] 1. A wiring material wherein a plurality of different conductive materials are integrally joined in parallel. 2. The wiring material according to claim 1, wherein said different conductive material comprises a conductive material capable of being welded by metal and a conductive material having high conductivity. 3. The wiring material according to claim 1, wherein said metal-weldable conductive material is iron, an iron alloy, nickel or a nickel alloy. 4. The wiring material according to claim 1, wherein the conductive material having high conductivity is copper or a copper alloy. 5. A method for producing a wiring material, comprising: a step of integrally joining a plurality of different kinds of conductive materials in parallel by welding and then rolling. 6. The method for producing a wiring material according to claim 5, wherein an annealing treatment is performed after said rolling. 7. The method of manufacturing a wiring material according to claim 5, wherein said welding is performed by an electron beam welding means. 8. A conductive material which can be welded by metal, such as iron, iron alloy, nickel or nickel alloy, and a conductive material having high conductivity, such as copper or copper alloy, are used as said dissimilar conductive materials. Or the method for producing a wiring material according to 7 above. 9. A wiring component having both sides or one side coated with an insulating material except for the terminal portion of the wiring material according to claim 1. 10. The wiring component according to claim 9, which is used for wiring means of a battery pack.