JPH0714569A - Current collecting terminal and manufacture of storage battery using same - Google Patents

Abstract

PURPOSE:To attain a large-current electric discharge by protruding conducting end edges on the upper and lower end faces of electrode plates of a storage battery, bringing a current collector into contact with the end faces, and bringing weld electrodes into contact with a current collecting terminal astride slit holes when a pair of the weld electrodes on the current collecting terminal are brought into contact. CONSTITUTION:A current collecting terminal 11 has eight comb teeth 12 and slit holes 13. The terminal 11 is brought into contact with the prescribed end face of an electrode, then a pair of weld electrodes are arranged at A, B astride the slit holes 13 and resistance-welded. The welding current is concentrated on a base material 14 sandwiched by two slit holes 13 and a base material 15 sandwiched by the slit hole 13 and the end, fusion occurs on the base material 15, and the current collecting terminal 11 is cut off into two. The reactive current at A, B is completely suppressed, and the welding current flows between A, B via the conducting end face. The comb teeth are radially formed symmetrically on the right and left, the uniform welding current flows, the welding efficiency is wholly improved, and a firm weld state is obtained.

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a current collector terminal of an alkaline storage battery such as nickel-cadmium or nickel-hydrogen and a method of manufacturing a storage battery using the same.

2. Description of the Related Art A battery of this type comprises a positive / negative electrode plate and a separator, which are either wound to form a spiral electrode body or are alternately laminated to form a flat plate electrode body. is there. From the standpoint of high-rate discharge characteristics, the method of attaching the current collector to each electrode is to project the conductive edge of the predetermined electrode plate on the upper and lower end surfaces of the electrode, and to form a slit as shown in FIG. A current collector including a welded portion 2 having a hole 1 and a large number of openings 3 and a current collector 5 having a projecting edge 4 is fixed by resistance welding. Since the current collector base material 6 existing between the slit hole and the outer edge of the current collector is melted during welding, no reactive current flows between the welding electrodes,
Moreover, the current collector is not deformed until welding. However, the current collector base material 6 existing between the slit hole and the outer edge of the current collector is melted during welding, but the welded portion 2 is in a state where the connection is maintained even during welding. In order to prevent the reactive current from flowing, the electric resistance of the welded portion 2 must be large. Specifically, it is necessary to reduce the thickness of the base material of the welded portion 2. Therefore, when a large current is applied, a voltage drop and heat generation occur in the welded portion 2,
Further, this portion causes fusing due to heat generation. That is, the current collector having such a shape has a relatively large resistance value, and the allowable current for charging / discharging the battery is limited by the thickness of the current collector base material.

The problem to be solved by the present invention is that the conductive edges are projected on the upper and lower end faces of the power generating element formed by winding the positive and negative electrode plates around the separator, and the current collector is attached to the end face. It eliminates the above-mentioned drawback of a storage battery obtained by welding with a pair of welding electrodes disposed on the current collector, that is, the drawback that a large current cannot be discharged.

The first current collecting terminal of the present invention is provided with a comb-teeth-like welded portion and a slit hole. In the second current collecting terminal of the present invention, the comb teeth of the welded portion are arranged radially from the center. The method of the present invention prepares a current collector having comb-shaped and slit holes arranged in a radial pattern, and has conductive edges on the upper and lower end surfaces of the electrode plate of the storage battery constituted by winding the positive and negative electrode plates with the separator. When projecting, the current collecting terminal is brought into contact with the end surface, and when welding is performed by a pair of welding electrodes arranged on the current collecting terminal, the welding electrode is in contact with the current collector so as to straddle the slit hole. It is a manufacturing method of a storage battery.

[Function] The current collector base material melts during welding and is cut into two completely, so no reactive current flows. Since the welded portion 2 does not exist, the thickness of the current collector base material can be arbitrarily changed, and the allowable charge / discharge current can be increased. In order to increase the allowable current, it is effective to increase the weld area. To increase the area of the welded portion, it is desirable to increase the number of comb teeth to increase the number of welding points between the electrode-side conductive edge and the current collector and reduce the electric resistance. In order to obtain a uniform and strong welding state for all of the plurality of comb teeth when the number of comb teeth is increased, it is necessary to make the current during welding evenly flow to all the welding points. For that purpose, it is effective that the comb-teeth-shaped welded portions are arranged radially from the center of the collector terminal.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a drawing showing an example of a current collecting terminal used in the method of the present invention. This current collecting terminal 11 has eight comb teeth 12 and slit holes 13. The process of welding the current collecting terminal to the conductive edge surface of the electrode by the method of the present invention will be described with reference to FIGS. First, the current collector terminal is brought into contact with a predetermined end surface of the electrode, and then the pair of welding electrodes is crossed over the slit hole A
And B for resistance welding. At the time of welding, the welding current is first concentrated on the base material 14 sandwiched between the two slit holes and the base material 15 sandwiched between the slit hole and the end.
The base material is melted and the collector terminal is completely cut into two. Therefore, the reactive current between A and B is completely suppressed,
The welding current will flow between A and B via the conductive edge surface. At this time, since the comb teeth are radially symmetrical, a uniform welding current flows, and a strong welding state with improved welding efficiency can be obtained as a whole. Incidentally, FIG.
FIG. 4 is a cross-sectional view of a power generation element in which the current collector is welded by the method of the present invention. The power generation element is a separator with positive and negative plates 21 and 22.
The power generating element is formed by winding it through 23, and a conductive edge (not shown) of the positive electrode plate 21 projects from one end surface of the power generating element, and a conductive edge 24 of the negative electrode plate 22 projects from the other end surface. And the current collector 11
The central part of is directly welded to a battery case (not shown), and serves as a negative electrode terminal.

As described above, the conductive edge of a predetermined electrode plate is projected on the upper and lower end surfaces of the electrode plate, and the current collecting terminal having the comb-like welded portions and slit holes arranged in a radial pattern is formed on the end surface. When abutting and welding with a pair of welding electrodes arranged on the current collecting terminal, the welding electrode is in contact with the current collecting terminal in a form of straddling the slit hole, so that a high current can flow Since the battery can be provided, its industrial value is extremely large.

[Brief description of drawings]

FIG. 1 is an external perspective view of a conventional collector terminal.

FIG. 2 is an external perspective view of a current collector terminal of the present invention.

FIG. 3 is a plan view of welding the current collecting terminal by the method of the present invention.

FIG. 4 is a side view when welding the current collecting terminal by the method of the present invention.

FIG. 5 is a cross-sectional view of the power generation element after welding the current collecting terminal of the present invention.

[Explanation of symbols]

 1 Slit hole 2 Welding part 3 Opening hole 4 Projection edge 5 Current collecting part 6 Current collector base material that melts during welding 11 Current collecting terminal 12 Comb teeth 13 Slit hole 14 Base material sandwiched by two slit holes 15 Slit hole 21. Positive electrode plate 22 Negative electrode plate 23 Separator 24 Conductive edge

Claims (3)

[Claims] 1. A current collecting terminal comprising a comb-toothed weld and a slit hole. 2. The current collecting terminal according to claim 1, wherein the comb teeth of the welded portion are arranged radially from the center. 3. A current collecting terminal having comb-like welded portions and slit holes is prepared, and conductive edges are projected on the upper and lower end surfaces of an electrode plate of a storage battery constituted by winding positive and negative electrode plates around a separator. At the same time, the current collector is brought into contact with the end face, and when welding is performed by the pair of welding electrodes arranged on the current collector, the welding electrode is in contact with the current collector in a form of straddling the slit hole. A method of manufacturing a storage battery having a feature.