Valve-controlled type lead-acid storage battery

Abstract

The invention discloses a valve-controlled type lead-acid storage battery. Lead plaster in a positive plate of the valve-controlled type lead-acid storage battery comprises the following active substances in percentage by weight: 68%-81% of lead powder, 3%-12% of red lead, 0.05%-0.15% of short fiber, 7%-11% of deionized water, 5%-10% of sulphuric acid with the density of 1.4g/mL and 0.2%-1% of additive; and the lead plaster in a negative plate of the valve-controlled type lead-acid storage battery comprises the following active substances in percentage by weight: 68%-82% of lead powder, 0.1%-0.3% of short fiber, 6%-15% of deionized water, 5%-15% of sulphuric acid with the density of 1.4g/mL, 0.1%-0.5% of acetylene black, 0.1%-1% of humic acid, 0.1%-1% of lignin and 0.5%-0.8% of barium sulfate. The valve-controlled type lead-acid storage battery produced according to the formulas of a positive electrode and a negative electrode has the advantages that the low-temperature discharge performance is substantially improved, and the discharge capacity at -40 DEG C reaches above 50% of the normal capacity.

Description

technical field [0001] The invention relates to the field of electrochemical technology, in particular to a valve-regulated lead-acid battery suitable for low-temperature environments. Background technique [0002] Valve-regulated sealed lead-acid batteries are widely used as main power or backup power in submarines, tanks, computers, communications, solar cells, etc. In some special fields or areas of use, higher requirements are placed on the low-temperature performance of batteries. Product testing requires that the capacity at -40°C low temperature for 5 hours (termination voltage 10.2V) is not less than 30% of the normal temperature capacity. However, with the ordinary lead paste formula, the low-temperature capacity at -40°C will drop to about 30% of that at room temperature, so the qualified rate of the product is very low. The reason is that when the temperature decreases, the viscosity of the electrolyte increases and the penetration ability weakens; at the same ti...

AI Technical Summary

Problems solved by technology

However, with the ordinary lead paste formula, the low temperature capacity at -40°C will drop to about 30% of the normal temperature, so the qualified rate of the product is very low

The reason is that when the temperature decreases, the viscosity of the electrolyte increases and the penetration ability weakens; at the same time, the internal resistance of the battery increases and the internal voltage drop increases; under the action of these factors, the discharge capacity of the battery decreases

In addition, when used in a low-temperature environment, the negative electrode active material of an ordinary valve-regulated lead-acid battery decreases rapidly as the temperature drops, and the charge acceptance of the battery decreases, which will further reduce the discharge performance of the battery, resulting in the low-temperature performance of the battery being unsatisfactory for use. Require

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