Electrothermal Coupling Modeling and Electrothermal Dynamic Characteristics of Nickel-Cadmium Battery

Abstract

Although Nickel-Cadmium batteries are widely used, there is a general problem of thermal failure and even thermal safety, and a lack of thermal characteristics and temperature rise law research. Accordingly, a typical Nickel-Cadmium battery’s equivalent circuit model, thermal model, and electrothermal coupling model were established in this article. The model’s open-circuit voltage, resistance, and capacitance, as well as its entropy heat coefficient, thermal conductivity and heat transfer coefficient were measured, and finally, according to these parameters, the verification analysis of the electrothermal coupling model was carried out in Simulink under the HPPC working condition and constant current working condition. The results show that the simulation results are basically consistent with the experimental data, the absolute value of voltage error is less than 0.02V under HPPC condition, the maximum voltage error is only 0.7% under constant current condition, and the temperature maximum error is only 3%. Consequently, the constructed electrothermal coupling model can well reflect the electrothermal characteristics of the battery, which provides data support and reference for solving the thermal failure problem.