Using probability density function to evaluate the state of health of lithium-ion batteries

► A new method, named probability density function(PDF), is proposed to help evaluate the SOH of power Li-ion battery. ► We have verified that the PDF method and the existing method incremental capacity analysis(ICA) have the same essence. ► According to the experimental data, the PDF method can get similar results with that of cyclic voltammogram. ► Based on the PDF method, we propose an online algorithm to evaluate the SOH of battery using partial charging or discharging.