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Dry Charge Battery Performance Issue

Prepared by : Nuruddin ( Production Engineer)

Date : 28^th Jan 14

Dry Charge battery should  perform cranking performance more than 60 days.

Theoretical:

A. Control at dryer positive

1. Dry-charged batteries suffer the most energy losses after formation, while the wet-charged batteries are less affected.
2. Thermopassivation
   1. Discharge voltage of the battery decreased with increase of the drying temperature.

(1) 25-80 C = low temperature region. The plates retain their energy, in terms of both mean discharge voltage and discharge time.

(2) 80-220 C = thermopassivation region. Thermopassivated plates retain their capacity, but the energy and power of the battery are reduced.

(3) > 250 C = thermal disintegration region. A lot of PbO formed (semiconductor layer).

B. Control mositure content

According to : Lead-Acid Batteries: Science and Technology: Science and Technology, D. Pavlov (page 546)

Moisture positive form recommend = < 0.2 % 

Moisture negative form and saparator recommend = < 0.05 % 

During storage, with high humidity in container,

• Oxygen evolved at positive plate during storage.
• The oxygen react with humidity oxidize Pb to PbO.
• Especially negative plate will effected (pure lead)
• The PbO react with residual H2SO4 to form PbSO4 (passivation layer)