Abstract:

The inconsistent charge of the single battery pack in series will lead to the reduction of pack capacity and power,which endanger the use safety of the battery pack,so it is very necessary to carry out the efficient charge balance management for the battery pack.In order to solve the problem of low energy transfer efficiency during the equalization,a charge balance method based on genetic algorithm is proposed.The energy transfer equation based on the equalization topology is written.The energy optimization model is established by taking the energy consumption as the optimization goal.The genetic algorithm is utilized to solve the optimal equilibrium path and determine the equilibrium transfer power of each battery.So the available battery pack capacity is increased.Finally, the experimental results show that the difference of charge after the equalization in the battery pack is reduced from 8% to 1.7%.Compared with the traditional average charge method, the equalization time is reduced by 29.4% and the available capacity of the battery pack is increased by 8.3%.

Key words: series-connected batteries, equalization, genetic algorithm, charge balance