锂电池组电化学-热耦合特性及参数敏感性研究OA

Based on the porous electrode theory and laws of heat transfer,a comprehensive model cou-pling a pseudo-two-dimensional(P2D)electrochemical model with a 3D thermal model was developed for the INR21700M50L lithium-ion battery.The model's accuracy in predicting terminal voltage and surface temperature rise was validated through multi-rate discharge experiments.Sensitivity analysis was systematically conducted to evaluate the effects of key parameters—including electrode particle ra-dii,electrical conductivities,and initial electrolyte concentration—on voltage characteristics and ther-mal behavior.The results indicate that the particle radii of both electrodes significantly influence volt-age polarization,and reducing particle size effectively elevates the voltage plateau.Thermally,the posi-tive electrode particle radius is the dominant driver of temperature rise,as larger sizes exacerbate diffu-sion limitations and irreversible heat generation,whereas solid-phase conductivity shows negligible im-pact.Analysis of variance(ANOVA)further confirms that the positive electrode particle radius contrib-utes 91.35％to temperature inhomogeneity,with a range of 1.783℃.Finally,an optimal parameter combination for thermal distribution was determined using the Taguchi orthogonal method,providing theoretical support for the electrode structure design of high-energy-density battery packs.