Abstract: The most important parameter in the life prediction of lithium battery is SOH( State Of Health) . Due to the interaction between individual cells in the battery pack, it is difficult to accurately predict the SOH of battery pack. Therefore, we propose a prediction model for SOH of lithium battery pack based on GRU(Gating Recurrent Unit) . Under different connection structures, charge cycle series, battery capacity series and battery temperature series are used to predict the health status of battery pack. The results show that in series and parallel connection mode, the prediction curves of single battery index show better degradation process of batteries, the prediction result is better than that of battery pack index and has lower pridiction error.

Key words: state of health; , gated recurrent unit; , battery capacity; , battery temperature