JPS62119875A - Lead storage battery - Google Patents

Abstract

PURPOSE:To prevent sulfation from occurring owing to excessive discharge or the like in a lead battery in which the distance between electrode plates is a prescribed value, by setting the ratio Wa/Wb of the total weight Wa of the sulfuric acid of the electrolytic solution to that Wb of the positive and negative electrode active materials in each block of the battery, at a prescribed value. CONSTITUTION:In a storage battery of lead in which the distance between electrode plates is 0.6-0.8mm, the ratio Wa/Wb of the total weight Wa of the sulfuric acid of the electrolytic solution in each block of the battery to that Wb of the positive electrode active material (PbO2) and the negative electrode active material (Pb) in each block of the battery is set at 0.31 or more. As a result, sulfation is prevented from occurring due to excessive discharge or long-period disuse.

Description

[Detailed description of the invention] Industrial applications The present invention relates to improvements in lead-acid batteries.

Conventional technology and ranking points In recent years, lead-acid batteries have become smaller, lighter, and more efficient.In order to improve high-rate discharge performance, the distance between the electrode plates has been reduced, and more active materials have been incorporated into a limited space. As a result of the necessity to reduce the amount of electrolyte, the ratio of the amount of sulfuric acid per cell to the amount of active material per 17 liters has become smaller. As a result, due to causes such as over-discharging or long-term storage, the electrolyte's deadness decreases, and the phenomenon that the active material becomes crystalline lead sulfate, which is difficult to return to its original state even after charging, is likely to occur (hereinafter referred to as ``Sal 7 Ation''). However, there was a drawback that the capacity and discharge voltage decreased.

OBJECTS OF THE INVENTION The present invention eliminates the above-mentioned drawbacks, and provides a lead-acid battery which does not suffer from cell 7ation even if over-discharged or left unused for a long period of time.

The m-structure of the invention The present invention provides a lead-acid battery with an inter-plate distance of 0.6 to 1.3 m, the total amount Wa of sulfuric acid in the electrolyte per cell, the positive electrode active material and the negative electrode active material per cell. Total amount of substances!!1 amount lol
This is a lead-acid battery with a ratio Wa/Wb of 0.31 or more.

Example An embodiment of the present invention will be described in detail with reference to FIG.

Figure 1 shows one example of a lead-acid battery with a 10 HR rated capacity of 20 AH.
It is a relationship diagram between the ratio Wa/Wb of the amount of sulfuric acid and the amount of active material per cell and the performance recovery rate of one battery. Here, Wa is the total weight of sulfuric acid (H2SO4) in the electrolyte per cell, and ya is the positive electrode active material (pbo2) and negative electrode active material (pb) per 17 liters.
represents the total weight of In addition, the battery performance recovery rate is 10 HR
It is expressed as a percentage (%) of the 10HR capacity after being charged by 2 people x 20 hours after overdischarging and leaving the rated capacity. Note that a thin separator and a glass mat are inserted between the electrode plates of the lead-acid battery, and the distance between the electrode plates is set to 0.66 M. Note that high rate discharge performance can be improved by setting the distance between the electrode plates in a range of 0.6 to 0.8 degrees. In FIG. 1, M is the result after being left for 30 days after overdischarge, and B is the result after being left for 15 days after overdischarge. As is clear from FIG. 1, when the ratio Wa/Wb is set to 0.51 or more, the battery performance recovery rate reaches 100% for both A and B. In addition, the capacity of batteries with 1Wa/Wb of 0.28 or less was hardly recovered for both A and B, and as a result of disassembly and investigation of the batteries, it was found that
It was found that acion was occurring.

Effects of the Invention As described above, the present invention provides a lead-acid battery with an inter-electrode distance of 0.6 to 0.8 liters, in which the ratio Wa/Wb between the amount of sulfuric acid and the amount of active material per liter is 0.31 or more. The simple means of setting the discharge voltage to 100% can prevent the occurrence of discharge due to over-discharge or long-term storage, and can improve high-rate discharge performance, and its industrial application is significant.

[Brief explanation of drawings]

Figure 1 shows the ratio Wa/W of the amount of sulfuric acid and the amount of active material per cell.
FIG. 3 is a relationship diagram between b and battery performance recovery rate.

Claims (1)

[Claims] In a lead-acid battery with a distance between electrode plates of 0.6 to 0.8 mm,
Ratio Wa between the total weight Wa of sulfuric acid in the electrolyte per cell and the total weight Wb of the positive electrode active material and negative electrode active material per cell
A lead-acid battery characterized in that /Wb is set to 0.31 or more.