Research on Influencing Factors for Consistency Performance of Lithium Ion Batteries

The capacity, energy, internal resistance and open -circuit voltage are key indicators to represent the performance of lithium ion batteries. The battery rate characteristic refers to the battery charge and discharge performance; the higher rate battery can withstand higher discharge current. This paper researched the influencing factors for consistency performance of Lithium ion batteries which were tested at 1/3C, 1.5C and 2C charge and discharge. The result shows that the charge and discharge voltage of the series-connected cell group is different slightly, and the basic electric performance (capacity, internal resistance) is not affected basically when the charge rate is less than 1C, the temperature rises slightly when charging the series-connected cell group when the charge rate is larger (higher than 1C), and proposes a method for select the appropriate battery charge and discharge rate, to eliminate the adverse batteries and ensure the good performance of batteries.