JPH0594814A - Lead-acid battery - Google Patents

Abstract

(57) [Summary] [Purpose] In a lead-acid battery manufactured by a connection method called welding or cast-on, even if the strap and the ears of the electrode plate are not completely fused, the function of the battery It is an object of the present invention to provide a lead acid battery that does not cause the destruction of electrical connection until the above conditions are met. [Structure] Welded or cast-on strap 5
The adhesive 6 is applied to. The application of this adhesive 6 prevents sulfuric acid from entering the gap 7 at the connecting portion between the strap 5 and the ear 5a of the electrode plate. [Effect] Even if the strap and the ears of the electrode plate are not completely fused and sulfuric acid does not penetrate into the gap between the ears of the strap and the electrode plate even if there is some fusion or contact, the electrical connection is destroyed. Generation of oxides to be generated can be suppressed and the function as a battery can be satisfied.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lead acid battery, and more particularly to a lead acid battery that compensates for manufacturing defects.

[0002]

2. Description of the Related Art In recent years, lead-acid batteries have been widely manufactured from small to large ones as power sources for automobiles, computer backup power sources, and emergency power sources for large facilities.

A conventional lead storage battery will be described below. In FIG. 4, 1 is an electrode plate, 2 is a connecting plate, 3 is a cathode plate, 4 is an anode plate, 5 is a strap, 10 is a battery case, and 11 is a lid. The manufacturing process of the lead storage battery configured as described above will be described below.

First, the strap 5 is generally formed by welding a caster such as a burner or a torch, or a caston in the form of a group of electrode plates having a plurality of cathode plates 3 and anode plates 4 having the same polarity. Thereafter, or when the strap 5 is formed, the pole 1 and the connecting body 2 are welded or formed according to the structure of the battery. Then, the above-mentioned electrode plate group is inserted into the battery case 10, and adjacent cells are connected to each other to form a battery.

However, in the above conventional structure, the ear of the cathode or anode plate 3 or 4 and the connecting portion of the strap 5 may not be completely fused together when the strap 5 is formed. The cause is caused by the formation of oxides in the fusion zone or the failure of the fusion conditions. Even such a conventional battery may function as a battery at the beginning of use when there is a slight fusion portion or sufficient contact. Therefore, it has a drawback that it is difficult to find such a defective battery immediately after production.

In FIG. 3, (a) shows the state immediately after the strap 5 is formed, (b) shows the progress of the fracture of the fused portion, and (c) shows the state where the fracture of the fused portion is completed. In FIG. 3, 5a is an ear of the electrode plate, 5 is a strap, 7 is a gap between the strap 5 and the ear 5a of the electrode plate, 8 is sulfuric acid that soaks into the gap 7, 9 is an ear 5a of the electrode plate of the gap 7 and a strap. It is an oxide formed on the surface of No. 5.

If the ears 5a of the electrode plates are not completely fused with the straps 5, the sulfuric acid 8 as the electrolytic solution gradually penetrates into the gap 7 between the straps 5 and the ears 5a of the electrode plates to cause charging / discharging. By repetition, oxide or a compound mainly composed of lead and sulfuric acid is formed, and finally the electrical connection between the strap 5 and the ear 5a of the electrode plate is broken.

[0008]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art. The battery fulfills its function even if the strap and the ears of the electrode plate are not in a completely fused state but are in a contact state. Until then, the object is to provide a lead-acid battery whose electrical connection is not destroyed.

[0009]

To achieve this object, the lead-acid battery of the present invention is manufactured by connecting the electrode plate and the connecting body, the electrode plate and the electrode plate, and the electrode plate and the electrode column by a welding method. In a lead acid battery, at the contact exposure boundary of at least two component materials,
It has a structure for forming an adhesive coating.

[0010]

With this configuration, in the lead acid battery of the present invention, the surfaces of the straps and the ears of the electrode plates and the gaps between them are covered with the adhesive coating film, and even when charging and discharging are repeated as a battery, The penetration of sulfuric acid into the gap can be significantly delayed. If the necessary contact area is secured even if the strap and the ears of the electrode plate are not fused at all, by increasing the thickness of the adhesive coating and increasing the coating area, the battery life will be increased. It is possible to delay the penetration of the sulfuric acid into the gap until the contact is established. Conventionally, similar to the present invention, there are those in which the strap portion is completely filled with the adhesive, and those in which the pole portion is coated with the adhesive. However, the former has a structure in which the strap part is embedded in a part of the lid, which requires a lot of battery space, and the latter is
This is to prevent the oxidation of the local battery caused by the difference in sulfuric acid concentration when the upper part of the pole is soaked or dried in the electrolytic solution. Both are judged to be different from the present invention.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A lead acid battery according to an embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, 1 is a pole, 2 is a connecting body, 5a are ears of a cathode plate and an anode plate, 5 is a strap,
6 is an adhesive, 7 is a gap between the strap 5 and the ear 5a of the electrode plate, and 13 is a separator.

The operation of the lead storage battery configured as described above will be described below. First, the electrode plate group is formed by the same method as the conventional method, and then the adhesive 6 is applied to the fused portion of the strap 5 and the ear 5a of the electrode plate which are formed by welding or cast-on method. The adhesive 6 to be applied may be any adhesive as long as it has acid resistance and high affinity with lead, but a general epoxy-based or urethane-based adhesive is preferable.

As described above, according to this embodiment, even if there is a gap 7 in the fusion portion between the strap 5 and the ear 5a of the electrode plate due to the coating film of the adhesive, the sulfuric acid penetrates into the gap 7. It is possible to significantly delay the generation of oxides on the surfaces of the straps 5 and the ears 5a of the electrode plates in the gap 7 due to charging and discharging of the battery.

Although the adhesive 6 is applied to the fused portion of the strap 5 and the electrode plate ear 5a in the embodiment, even if the entire periphery of the strap 5 and the electrode plate ear 5a are applied, the adhesive 6 can be applied. It goes without saying that it may be a part. Instead of coating, a mold may be formed and filled.

[0016]

As apparent from the above description of the embodiments, according to the lead-acid battery of the present invention, the adhesive is applied to the fusion portion of the ears of the strap and the electrode plate so that the ears of the strap and the electrode plate are separated from each other. Prevents sulfuric acid from penetrating into the gap between the strap and the ear of the plate even if it is not completely fused, that is, even if it is partially fused or in contact, and it causes a break in the electrical connection. Generation of oxides can be suppressed and the function as a battery can be satisfied.

[Brief description of drawings]

FIG. 1 is a front view showing a main part of an electrode plate group of a lead storage battery according to an embodiment of the present invention.

FIG. 2 is a side sectional view of the portion A of FIG.

3 (a), (b), and (c) are cross-sectional views showing a process in which the electrical connection between the battery strap and the electrode ear of the battery with the imperfect fusion of the conventional strap and the electrode ear is broken. Figure

FIG. 4 is a cross-sectional view mainly showing a state in which a conventional lead acid battery for an automobile is connected to a plate group and a strap.

[Explanation of symbols]

 1 pole pillar 2 connection body 5 strap 5a pole ear 6 adhesive 7 gap

Claims (1)

[Claims] 1. A lead-acid battery manufactured by connecting an electrode plate and a connecting body, an electrode plate and an electrode plate, an electrode plate and an electrode column, etc. by a welding method,
A lead acid battery in which an adhesive coating is formed on a connection exposed boundary portion of at least two component materials.