Method for evaluating remaining available life of battery

The invention discloses a battery remaining available life evaluation method which comprises the following steps: 1) measuring the cycle life of a single cell, drawing a cycle curve by using Origin, and performing nonlinear curve fitting by using Gauss to obtain a fitted curve; 2) measuring a cycle life curve of the battery system; 3) counting the ratio of the capacity retention ratio of the battery system to the capacity retention ratio of the single cell under the same cycle index; 4) calculating the capacity retention ratio-cycle index data of the single cell, and fitting a capacity retention ratio-cycle index curve of the single cell by means of Gauss; (5) the fitted curve and the single cell capacity retention ratio-cycle number curve are overlapped, and an evaluation curve is obtained; and 6) taking the coincidence point as the current cycle life progress point of the single battery cell, combining the Nc and K = Np/Nc to obtain Np, obtaining the cycle life progress point corresponding to the Np on the