The capacity effect on consistency of energy storage batteries

The consistency tests of power Li-ion batteries which were good capacity, internal resistance consistency, and initial open-circuited potential were researched. The results showed that the monomer capacity consistency has a more significant impact on the capacity of series-connected battery pack, the capacity of battery pack is equal to the minimum capacity of single series of batteries — short board effect, the monomer battery capacity declines, causing the capacity of whole battery pack decrease proportionally. The voltage dispersion in later charging and discharging stage also increases with the capacity difference. And according to the analysis of the difference in voltage among 4 discharged batteries, at a normal temperature, the consistency among the batteries goes down at the end of the discharge process, while with the decrease in temperature, the consistency among the batteries goes down throughout the discharge process.