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Theory of Seal

PbO2+2H2SO4+Pb
PbSO4+2H2O+PbSO4

(Lead dioxide) (Sulphuric acid) (Spongy lead)
(Lead sulphate) (Water) (Lead sulphate)
Positive Electrolyte Negative
Positive Electrolyte Negative
active active
active active
material material
material material

When battery charging approaches its final stage, the charging current is consumed solely for electrolytic decomposition of water in the electrolyte. Which results in generation of oxygen gas from positive plates and hydrogen gas from negative plates, the generated gas will escape from the battery and cause a decrease of the electrolyte. Therefore occasional water replenishment is required. However, in the our VRLA Batteries, the cell is designed to promote the chemical recombination of oxygen at the negative electrode via the so-called internal oxygen cycle or oxygen-recombination cycle, i.e.

At the positive electrode:
At the negative electrode:
H2O
2H++1/2O2+2e-
Pb+1/2O2+H2SO4
PbSO4+H2O
PbSO4+2H++2e-
Pb+ H2SO4

In this cycle, by using superfine glass-fiber separator and the cathode adsorbent technology, there are about 5% air channels preliminarily reserved in the separator between anode and cathode. The oxygen generated on the positive plates in the final stage of charging will pass through the air channels to negative plates and react with sponge lead, The oxygen becomes water and returns to system, and the lead becomes lead sulfate and then returns to lead during over charging. As increasing polarization potential at the same time, the hydrogen doesnt separate out from the negative plate. This is why our batteries can realize seal and maintenance-free.



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