JPH0433257A - Manufacture of lead battery - Google Patents

Abstract

PURPOSE:To shorten the aging period by using the lead powder with the oxidation degree of a specific value or more for an active agent raw material, and using an electrode plate substrate formed with lead sulfate on the surface in advance. CONSTITUTION:Lead sulfate is formed in advance on the surface of the electrode plate substrate of a lead battery in which the lead powder with the oxidation degree 95% or more is used for an active agent raw material. The aging period is shortened, and the adhesion between a lattice and the active agent can be improved.

Description

[Detailed description of the invention] Industrial applications The present invention relates to an improvement in a method for manufacturing a paste type lead-acid battery.

BACKGROUND OF THE INVENTION Conventionally, so-called lead powder, which is mainly composed of a mixture of pbo and metallic lead, has been used as a raw material in the production of paste-type lead battery electrode plates. Usually, the degree of oxidation of this lead powder, that is, the ratio of PbO contained in the lead powder, is 60 to 80%.

This lead powder is kneaded with dilute sulfuric acid to make a paste,
After being filled into a lattice body, an electrode plate is manufactured through a maturing and chemical conversion process. In the case of anode plates, it is necessary to gradually oxidize the metallic lead in the paste in the kneading and aging process before the chemical conversion process, and reduce its content to 5% or less, more preferably 1% or less, immediately before the chemical conversion process. There is. This is because if a large amount of metallic lead remains in the electrode plate before chemical formation, a sufficient amount of pbo will not be generated during the chemical formation process, resulting in poor electrode plate performance.

Problems to be Solved by the Invention Aging of electrode plates is carried out by storing the plates in a humid atmosphere for one day or more in order to sufficiently reduce the content of metallic lead, and lead-acid battery manufacturing This is the rate-limiting process above.

The present invention provides a method for manufacturing an electrode plate having the necessary and sufficient performance by aging for a very short time.

Means for Solving the Problems In order to achieve this object, the surface of the electrode plate substrate of a lead battery that uses lead powder with an oxidation degree of 95% or more as an active material raw material is previously converted into lead sulfate.

Function This shortens the aging time and improves the adhesion between the lattice and the active material.

Example The present invention will be explained below with reference to Examples.

A positive electrode paste was prepared by a conventional method using lead powder with different degrees of oxidation, and after filling it into the electrode plate base of an automotive lead battery,
Aging was carried out for 2 hours at 0''C298%.A similar aging was also carried out on an electrode plate whose surface had been previously treated with lead sulfate and filled with paste.

This lead sulfate is oxidized to pbo during chemical formation, which improves the adhesion between the lattice and the active material. In addition to lead sulfate, similar effects can be obtained with lead oxide and the like. Using the electrode plates thus produced, a battery with a nominal capacity of 27 Ah (5 hR) was assembled, and a battery case was formed. The test results are shown in Table 1. Battery No. 9 had a conventional method for comparison, and the pbo□ amount after chemical formation was 90% and the 5hR capacity was 27.2Ah. Battery resistance without substrate surface treatment 1~
For both batteries No. 4 and No. 5 to No. 8, in which the surface of the substrate was made of lead sulfate, as the degree of oxidation of the lead powder in Table 1 increases, the pbo, amount, and 5 hR
Both capacities increased and were saturated at 95% or more.

The battery whose substrate surface was treated with lead sulfate had a higher level of performance than the one without treatment, and the performance of batteries No. 7 and No. 8 was comparable to that using the conventional method (No. 9). Thus, it can be seen that the ripening time can be shortened by using lead powder with an oxidation degree of 95% or more and by treating the surface of the substrate with lead sulfate to improve the adhesion between the substrate and the active material.

Effects of the invention As shown in the examples, by using lead powder with an oxidation degree of 95% or more as the raw material for the active material and by using an electrode plate substrate whose surface has been previously treated with lead sulfate, the aging time is significantly shortened. It can be done, and its industrial value is great.

Claims (2)

[Claims] (1) A method for producing a lead battery, characterized in that lead powder with an oxidation degree of 95% or more is used as an active material raw material. (2) The method for manufacturing a lead battery according to claim (1), wherein an electrode plate substrate whose surface has been previously treated with lead sulfate is used.