Abstract
Lead-acid batteries are widely used as backup in power systems. Recently, charge-transfer resistances on electrode-electrolyte interface have been studied to estimate state of health (SOH) in backup batteries, and some conclusions have been obtained. Charge-transfer resistances do nonlinearly characterize full-scale SOH in specific degradation experiment on 10 Ah batteries. This paper proposes characteristic charge-transfer resistances, combining with charge-transfer resistances to linearly characterize multi-scale SOH on four 500 Ah batteries in parallel experiments. The results provide viable solution for linear estimation of targeting-scale SOH (500 Ah∼250 Ah) on lead-acid batteries.
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