Study on the influence factors of the cycle life of lead-acid battery in DC system

The high-current accelerated cycle test was used to detect and evaluate the lead-acid battery in the DC system. The results showed that at a temperature of 50 °C, a charge and discharge of 100A, a charge cut-off voltage of 2.4V, and a discharge cut-off voltage of 1.75V were used. The charging time is t1 (t1 is the charging time in the first cycle equal to the charging time when the capacity is discharged). The capacity retention rate is 93.31%, and the charging time is t2 (t2 is the charging capacity in the first cycle is 1.03 times the discharge capacity. The capacity retention rate is 74.72%. Overcharge can reduce the capacity retention rate; the slope during the charging and discharging stages has a good relationship with the capacity retention rate. The slope can be used to represent the capacity retention rate, so the capacity retention can be predicted in advance rate. The research results can realize the detection of DC batteries and provide a basis for battery quality evaluation.