Cycling Performances and Failure Modes for AGM and Standard Flooded Lead Acid Batteries under Partial State of Charge Mode

Abstract

In this work, the failure mode of the lead acid battery under 17.5% depth of discharge was predicted. Both the developed lead acid absorbent glass ma (AGM) battery for microhybrid applications and the standard flooded battery were tested. The end of discharge voltage and the charging factor were presented for each type of battery. The analysis of the negative plates after cycling was carried out for the two types of batteries. The test results revealed that they significantly depend on the battery technology. The standard flooded battery fails from the second unit of the test, whereas the AGM performs 16 units. For the standard flooded, a stratification of lead sulfate is observed and causes the end of the battery life. However, the sulfate is homogeneous according to the plate’s area for the AGM battery.