JPS638056Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an alkaline storage battery, and particularly to an improvement in the current collection structure.

First, a conventional example of a cathode side current collecting structure will be described in detail with reference to FIGS. 1 to 4, taking a nickel-cadmium battery equipped with a spiral electrode body as an example.

As an example, as shown in FIG. 1, a cathode plate 103 in which a core body 131 integrally formed with a current collecting tab 131' is buried is used, and the current collecting tab 131' is spotted on the inner bottom surface of a battery container 110 that also serves as a cathode terminal. A method is adopted in which the current collecting tabs 131' are fixedly connected by welding (FIG. 2A) or by clamping the current collecting tab 131' against the inner surface of the battery container 110 (FIG. 2B).

In this case, in the former case, the spot welding process is complicated and workability is poor, while in the latter contact method, the current collecting tab is an extension of the electrode core, so its thickness is extremely thin, and therefore it has sufficient elasticity. Therefore, mere clamping pressure alone does not provide sufficient electrical conductivity.

Another example is the so-called tableless method,
As shown in FIG. 3, a cathode current collector plate 108 formed with one tab portion 181 was used, and this current collector plate 108 was welded to the core end edge 131' of the cathode plate 103 that protruded from the lower surface of the electrode body. After that, the tab portion 181 is fixedly connected to the inner bottom surface of the battery container 110 that also serves as a cathode terminal by spot welding (FIG. 4A), or the tab portion 181 is clamped and connected to the inner surface of the battery container 110 (FIG. 4A). There is a way to do this.

In this case, in the former case, the spot welding process is complicated and workability is poor, as in the previous conventional example, while in the latter case, the tab part 181 of the current collector plate 108, which is thicker than the electrode core body, is used, so it is not enough. Although it has good elasticity and satisfactory conductivity can be obtained with just clamping pressure, since there is only one tab portion 181 formed on the current collector plate 108, there is If the tab portion 181 is located in the gap at the end of the electrode plate on the outer periphery of the spiral electrode body, there is a concern that the electrode body and the battery container will not be clamped together and a sufficient electrical connection will not be established. In addition, Figures 1 to 5
In the figure, 104 is an anode plate, and 105 is a separator.

The present invention was developed in view of the above problems, and aims to improve the contact method when using current collector plates with sufficient elasticity. The core edge of the cathode plate is protruded from the lower surface of the electrode body on which the cathode plate or separator is located on the outer periphery, and a current collector having a pair of tabs extending from at least the opposite edge is attached to the core body. To provide an alkaline storage battery in which a cathode plate and a battery container are electrically connected through the tab portion fixed on the edge and clamped between the electrode body and the inner surface of the battery container which also serves as a cathode terminal. It is.

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 6 and 7.

Reference numeral 10 denotes a battery container which also serves as a cathode terminal, and a sealing lid 20 is attached to the opening of the battery container through an insulating packing 1.
is installed. 2 is a spiral electrode body in which negative and anode plates 3 and 4 are wound with a separator 5 in between,
An edge 41' of the anode plate core 41 protrudes from its upper surface, and an edge 31' of the cathode plate core 31 protrudes from its lower surface. Reference numeral 6 denotes an anode current collector fixed to the edge 41' of the anode plate core 41, and the end of the tab portion 61 is spot-welded to the sealing plate 7 joined to the lower part of the sealing lid 20. They have electrical connections.

8 is a cathode current collector whose details are shown in FIG. 7, and has at least a pair of tab portions 8 on opposing edges.
1,81 has been extended. This current collector 8 is fixed to the core edge 31' of the cathode plate 3 on the lower surface of the electrode body, and the tab portions 81, 81 are connected to the electrode body 2.
and the inner surface of the battery container 10, and the cathode plate 3 and the battery container 1 are connected via the tab portions 81, 81.
0 are electrically connected.

According to the battery structure of the present invention, a current collector having a thickness sufficient to have elasticity is used, and at least one pair of tab portions is formed on the opposing edges of the current collector. Even if the tab is located in the gap at the end of the electrode plate on the outer periphery of the electrode as shown in FIG. 5, poor contact can be compensated for by the other tab, and a reliable electrical connection can be achieved. In addition, compared to the case where a current collector provided with one tab portion is used, there is no need to consider the directionality when attaching the current collector to the lower surface of the electrode body, so that work efficiency is improved.

[Brief explanation of the drawing]

Figures 1 to 5 show conventional examples, where Figure 1 is a perspective view of a conventional cathode plate, Figures 2A and 2B are sectional views of essential parts of a conventional battery using the same cathode plate, and Figure 3. 4 is a perspective view of a conventional current collector, FIGS. 4A and 4B are sectional views of main parts of a conventional battery using the same current collector, and FIG. 5 is an example of a case using the same current collector as above. A cross-sectional view of a conventional battery, FIGS. 6 and 7 are related to the present invention, FIG. 6 is a longitudinal cross-sectional view of the battery of the present invention, and FIG. 7 is a perspective view of a current collector applied to the same battery. . 2... Electrode body, 3... Cathode plate, 31... Cathode plate core, 31'... Core body edge, 4... Anode plate, 41
...Anode plate core, 41'... Core edge, 5... Separator, 6... Anode current collector, 8... Cathode current collector, 81, 81... Tab portion, 10... Battery container ,
20... Sealing lid.

Claims (1)

[Scope of utility model registration request] The core end edge 41' of the cathode plate 3 is placed on the lower surface of the spiral electrode body 2, which consists of cathodes and anodes 3 and 4 and a separator 5 inserted between these plates, and the cathode plate 3 or the separator 5 is located on the outer periphery of the spiral electrode body 2. A current collector 8 having a protruding thickness and a pair of tab portions 81, 81 extending from at least opposing edges is fixed on the core end edge 41', and is thick enough to have elasticity. An alkaline storage battery in which the cathode plate 3 and the battery container 10 are electrically connected via the tab portions 81, 81 which are clamped between the inner surface of the battery container 10 which also serves as a cathode terminal.