VRLA Technology
The electrochemical reaction of batteries in charge and discharge process is as follows:
Discharge
PbO
2
+2H
2
SO
4
+ Pb PbSO
4
+ 2H
2
O + PbSO
4
Charge
In the final stage of charge process, active substance in positive plate fully transformed to lead
dioxide, negative plate has not reached fully charged stage, the process of active substance in
negative plate transformed to spongy lead is not finished, oxygen gas generated in positive plate
reaches the negative plate through separator pores and then reacts with active substance in
negative plate, resulting depolarized state in negative plate, and restraining the generation of
hydrogen.
Principle of the oxygen reduction cycle is as follows:
P
ro
d
u
c
t
In
tr
o
d
u
c
ti
o
n
03
