An analysis of optimized series and parallel method for traction lithium-ion batteries

Based on the actual operating characteristics of series and parallel batteries, the influences of different pack connection methods on the power ability have been analyzed. Meanwhile, the uneven temperature distribution and imbalanced current phenomenon were described. The results of series cycling tests and parallel cycling tests were studied, which indicate the degradation reasons and fading paths of battery pack. Identification and prediction of operating conditions for different connection methods will significantly extend the lifespan of battery pack. The general control principles obtained from evaluations on the influences of series and parallel components can be used to prolong the cycle life and further optimize the grouping management.