Cause of premature capacity-loss of Pb-Ca-Sn-Al alloy grids battery
Pb-Ca alloys are widely used in valve-regulated lead-acid (VRLA) battery.Premature capacity-loss of Pb-Ca alloy casting grid battery is studied.The same batch of Pb-Ca alloy plates are used to make the battery with different acidizing processes,the cycle tests are carried out.The battery with low charging current has premature capacity-loss,while the cycle performance of the battery with high charging current is normal.The battery with premature capacity-loss is analyzed,it is found that the lead sulfate crystal barrier layer formed at the grid corrosion interface is the main cause of premature capacity-loss of the battery.Improving the charge efficiency of the battery,such as adding electrolyte additive,reverse charging the battery before the formation,increasing the charge current and so on,can facilitate the transformation of lead sulfate,better avoid premature capacity-loss of the battery.
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