How to Improve VRLA Batteries

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How to Improve VRLA Batteries [Copy link]

How to Improve VRLA Batteries

The main purpose of lead-acid battery research and development:

——Achieve maximum discharge capacity and deep discharge application;

——After multiple charge and discharge cycles, it can maintain the maximum capacity as much as possible.

The discharge reaction of a lead-acid battery is expressed as follows:

Positive electrode: PbO2 + 3H + + HSO4 - + 2e → PbSO4 + 2H2O (1)

Negative electrode: Pb + HSO4- → PbSO4 + H + + 2e (2)

The technical challenge in achieving maximum discharge capacity is how to push all reactants to the reaction zone quickly. To achieve this goal, three main units must provide:

- surface area of solid reactants;

- high flow rates in solution (short diffusion distances);

——Low resistance to maintain corresponding electron flow.

After each discharge, the most ideal state includes: high surface area of solid and low resistance between the grid and the plate, through the reverse reaction of equation (1) and equation (2), they can be charged and stored. Under ideal conditions, the capacity of the battery remains unchanged when it is cycled.

In fact, from the beginning of life, the utilization rate of solid active substances is only about 30% (now it can reach 40%). As the process progresses and the number of cycles increases, its performance will decrease. Several serious failure mechanisms affect the supply and state of one or more active substances.