SOH Estimation Method for Lithium-ion Batteries Based on Partial Charging Voltage Segments

The state of health (SOH) estimation of lithiumion battery is considered a key component of battery management. A SOH estimation method for lithium-ion batteries, which is based on the partial charging voltage segments, is proposed. The voltage data segments was extracted, and the charging time series corresponding to each mv voltage value was reconstructed by interpolation method, which is used as the input of the RNN network. Finally, the estimated SOH value was obtained. The proposed method was applied to CALCE dataset, and accurate estimation result of SOH can be achieved with only 0.1v voltage segment data.