JPS6028061Y2 - storage battery - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement in a storage battery in which the ears of the electrode plates are assembled to connect the cells.

BACKGROUND ART Conventionally, this type of storage battery has been proposed in which the ears of each electrode plate are connected together so that they are overlapped in the connection direction.

However, with this structure, multiple lugs are welded one on top of the other, so depending on the number of electrode plates, some lugs may overheat and melt during welding, and the current density at the joint may be uneven. The connection becomes heated during charging and discharging.
Furthermore, when forming a sealed body by injection molding to maintain liquid tightness around the connection part, the range of movement for inserting and tightening the molding die into the cell chamber is narrowed due to the length of the connection part. , it is impossible to mold the above-mentioned sealed body in small storage batteries,
There were drawbacks such as.

Therefore, the present invention attempts to eliminate the above-mentioned drawbacks of the prior art by arranging the ears of the electrode plates in the direction of the partition wall surface and connecting them facing each other at the partition wall notch.

This will be explained below based on one embodiment.

First, in the figure, 1 is a battery case 2 made of thermoplastic material, which is a partition wall, 3 is a partition notch, 4 is a cell chamber partitioned by the partition wall 2, 5 is a cathode plate, 6 is an anode plate, and 7 and 7 are cathode plates. ears,
8 is the lug of the anode plate, W is the lug of the electrode plate (cathode plate in the figure of the embodiment), 9 is the separator, 10 is the connection between cells, and 11 is the battery case 1.
A sealing body 12 made of the same material as the above is a molding die for forming the sealing body, A is a movable range of insertion and tightening of the molding die 12 in the cell chamber 4, 13 is a pole pole for a terminal, and 14 is a molding die for forming the sealing body. Battery case 1
15 is a terminal, and 16 is a liquid spout plug.

Next, to explain the assembly of the storage battery of the present invention, the separator 9
Layer the required number of cathode plates 5 and anode plates 6 with
For end cells, after attaching the terminal pole posts 13, insert them into the respective cell chambers 4 without forming straps, and attach each ear of the cathode and anode plates 5 and 6 as shown in FIGS. 1 and 2. 7.7゛
8 are arranged in the direction of the partition wall surface, facing each other at the partition wall notch 3, and welded by resistance welding or other method to form the inter-cell connection portion 10.

Next, as shown in FIG.
The sealed body 11 is molded by injecting a melt of the same material as the battery case 1 into the mold 12 placed on both sides of the battery.

In this way, the adjacent cells are connected via the partition wall 2 in a liquid-tight manner, so the lid 14 as shown in FIG. Assembling the storage battery is completed by welding the pole pole 13 and the terminal 15.

In the above embodiment, the case in which there are two cathode plates 5 and one anode plate 6 per cell is illustrated, but the present invention is not limited to this, and the number of bipolar plates can be arbitrarily selected. In some cases, the number of anode plates can be greater than the number of cathode plates.

Since the storage battery according to the present invention has the ears of the electrode plates arranged in the direction of the partition wall surface and connected facing each other at the partition wall notch as shown in the above, it goes without saying that there is no need to form a strap. Unlike the conventional method of connecting the electrode plates in clusters with their ears overlapping in the connection direction, the welding section between cells can be formed in proportion to the number of electrode plates, so that the current density is evenly distributed. Therefore, the connection portion will not be heated during charging and discharging, and there is no risk that the lugs will melt during welding.

Furthermore, since the length of the inter-cell connection is shorter than that of the conventional one, the movable range of insertion and tightening of the molding die to form the sealed body is reduced by the shorter length ( Figure 3A
) is wider, which makes it possible to form a sealed body by injection molding in a storage battery that is even smaller than before.

Although the present invention having the above advantages can be applied to storage batteries for various purposes, it is most suitable for small storage batteries such as those for motorcycles, and has great practical value.

[Brief explanation of the drawing]

Fig. 1 is a cutaway perspective view of the main parts of the storage battery of the present invention, showing the state immediately after the inter-cell connections have been formed, Fig. 2 is a longitudinal cross-sectional side view of the inter-cell connections, and Fig. 3 is the state immediately after the sealing body has been formed. FIG. 4 is a longitudinal sectional side view of the storage battery of the present invention showing its state, and FIG. 4 is a partially cutaway perspective view of the lid. 1: Battery case, 2: Bulkhead, 3: Bulkhead notch, 7/7'/8:
Ear, 11: Sealing body, 14: Lid.

Claims (1)

[Claims for Utility Model Registration] 1. In a storage battery in which the respective electrode plate lugs of both adjacent cells are collectively connected through a partition wall of a battery case, the lugs are arranged in the direction of the partition wall surface and are faced to each other at the partition wall notch. A storage battery characterized in that it is connected to 2. The storage capacity according to claim 1 of the utility model registration claim, which is formed by molding a sealing body by injection molding into the partition wall notch and heat-welding the battery case and the lid.