JPS603871A - Lead-acid battery - Google Patents

Abstract

PURPOSE:To eliminate generation of syneresis and obtain a leakage free lead- acid battery by mixing silica fine powder in positive active material of a clad type lead-acid battery using gelled electrolyte. CONSTITUTION:Silica fine powder is mixed in positive active material of a lead- acid battery in which gelled electrolyte formed with silica and dilute sulfuric acid is used and clad type plate is used as a positive plate. For example, 8wt% of silica powder is added to 1kg of lead powder with an oxidation degree of 70%, and they are filled in a tube to prepare a clad type plate. Dilute sulfuric acid with a specific gravity of 1.28 containing 10wt% of silica is poured to form a lead-acid battery. Since free dilute sulfuric acid is absorbed by silica powder existing in fine pores of active material, generation of syneresis is prevented.

Description

Detailed Description of the Invention The present invention uses a gel electrolyte solution made by mixing dilute sulfuric acid, silicic acid anhydride, etc. to form a gel, and uses a clad type electrode plate for the positive electrode plate 3)) Storage battery IWJ Rirmono C is an improvement on this.

Conventionally, in non-leak type or sealed type 1() storage batteries, a gel electrolyte solution prepared by mixing dilute sulfuric acid, anhydrous silicic acid, etc. with the electrolyte solution to avoid gelation has been used. When using a gel Ti solution made by gelling such dilute sulfuric acid with silicic acid anhydride, fine powder of silicic anhydride is extremely It does not enter the active material pores of the plate, and the dilute rIi! Only 1 brewing permeates into Katsuichi Kakanai. The dilute sulfuric acid in the pores is pushed out of the electrode plate by the gas generated during charging, which separates from the gel electrolyte and forms a syneresis fluid that accumulates at the top of the gel electrolyte, causing leakage. What kind of flaws were there that caused it? Although good countermeasures have been proposed for lead-acid batteries using base-type electrode plates, the present invention eliminates these drawbacks in lead-acid batteries using clad-type electrode plates. , provides a battery with a capacity greater than conventional ones by f > 71.
It is something that The main point and four points are that
In contrast to the previous method in which the lead powder was filled with lead powder, it was filled with lead powder and anhydrous silicic acid fine powder (hereinafter referred to as silica powder). By covering in this way, even if silica powder is already present in the pores of the positive electrode active material, even if the gel electrolyte is filtered, only dilute sulfuric acid will penetrate into the pores of the active material. However, the silica powder absorbs the free dilute sulfuric acid, so that free dilute sulfuric acid is not pushed out from the pores of the active material and becomes a synergic fluid during charging, unlike in the conventional case.

Next, 1L12 will be explained in detail using a specific example. Oxidation degree 70
% of lead powder I Kq, 8% silica powder is added with a weight of 1-1, and this is filled into a tube.
A lead-acid battery according to the present invention having a nominal capacity of 1200 At+ was injected with dilute sulfuric acid with a specific gravity of 1.28 containing 10% of sulfuric acid, and the same electrolyte was injected with the same electrolyte using a conventional clad plate filled with lead powder. A conventional lead-acid battery with a different capacity was prepared, and the initial capacity of these batteries after the first charge was compared.

The results are shown in Table 1. In addition, in Table 1, all are shown as ratios when the conventional product is set as 100.

Table 1 As is clear from Table 1, in the product of the present invention, as the -C free 8-sulfuric acid is absorbed by the silica powder existing in the pores of the active material as described above, Almost no syneresis fluid was produced. In terms of capacity, performance has also been significantly improved. This is because silica powder exists within the pores of the active material and absorbs and retains -C dilute sulfuric acid, and the concentration of silica d3 J: and dilute sulfuric acid is uniform within the pores and is connected to the electrolyte layer. This is because the supply of sulfuric acid during discharge becomes smooth.

As described above, based on the present invention, in a clad lead-acid battery using a gel electrolyte (by mixing anhydrous silicic acid fine powder into the positive electrode active material, syneresis liquid, which has been a drawback of conventional lead-acid batteries of this type) This eliminates the formation of lead-acid batteries, which are stable and do not leak, and also significantly improves performance compared to conventional products.

Claims (1)

[Claims] Gel electrolysis formed with anhydrous silicon VU cap and dilute sulfuric acid in the electrolyte)
112, and a 1() storage battery using an IF positive electrode plate clad type electrode plate (11) A lead-acid battery characterized in that an anhydrous silicic acid fine powder is mixed in the electrode active material.