Electrothermal coupling modeling of battery pack considering time-varying parameters

doi:10.19799/j.cnki.2095-4239.2022.0219

Abstract

Abstract:

When designing a power battery-pack cooling system, the use of finite element modeling to estimate the battery temperature cannot be simulated in real-time using the control algorithm. Thus, an electrothermal-coupling model built in MATLAB/Simulink based on the heat generation and dissipation characteristics of the battery is proposed to estimate the temperature change of the battery pack in real-time. The electrothermal-coupling model of the power battery is composed of two parts: the battery equivalent circuit and thermal models. The battery charge and discharge test is used, and the genetic algorithm is used to identify the equivalent circuit model parameters under the time-varying conditions offline. The thermal model parameters are theoretically analyzed. Heat generation and dissipation methods were calculated. The equivalent circuit and battery thermal models are coupled with each other using the relationship between internal resistance and temperature, thus, establishing a single battery electrothermal-coupled model. The temperature model of the cooling channel is established to improve the electrothermal-coupling model of the battery pack by analyzing the heat-transfer mode of the battery module. The temperature difference between the battery-coupling model and numerical simulation using STAR-CCM+ is 1 ℃; the terminal-voltage simulation results of the electrothermal-coupling model can track the measured terminal voltage and can describe the battery pack at the same time. The Temperature distribution during the internal cooling process. The research results show that the electrothermal-coupled model can estimate the temperature change of the actual battery pack to shorten the development cycle of the thermal management control strategy for the battery pack.

Key words: lithium ion battery, parameter identification, electrothermal coupling model, STAR-CCM+

CLC Number:

TM 911

Yong LUO, Zhenyu ZHOU, Futao SHEN, Huan HUANG, Xiaobin QIU, yongyong WENG. Electrothermal coupling modeling of battery pack considering time-varying parameters[J]. Energy Storage Science and Technology, 2022, 11(10): 3180-3190.

Figures/Tables 14

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