Health Factor Experimental Testing and SOH Estimation for Nickel Cadmium Batteries

Abstract

Based on the fact that the working characteristics of Nickel–cadmium battery are significantly different from lithium batteries, and in view of the complex discharge conditions of Nickel–cadmium battery in Multiple Unit, a SOH estimation method of Nickel–cadmium battery based on charging health factors was proposed. Firstly, aging experiments were conducted on individual nickel cadmium batteries using an experimental platform; Secondly, health factors such as total charging time, constant voltage charging time at the end of constant current charging, and average current during a specific time period of constant voltage charging were selected as health factors at different aging stages. The rationality of the health factors was verified through correlation analysis; Then, principal component analysis was used to reduce the dimensionality of the health factor data matrix as input to the support vector regression model, and cross validation was used to optimize the model parameters; Finally, the proposed method was validated based on experimental data.