Thermal design and operation strategy of automotive lithium battery based on critical heat transfer coefficient and intervention time

doi:10.19799/j.cnki.2095-4239.2021.0185

Abstract

Abstract:

The thermal management of automotive lithium batteries during high-rate discharge is being investigated. Based on the thermal management concept of matching the heat generation and heat dissipation of the battery, the critical heat transfer coefficient h_cr is innovatively proposed to ensure the battery's safe operation, and a set of numerical solution methods for determining h_cr is developed. For numerical calculation, a thermoelectric coupling model of a single cell is established. The findings indicate that the critical heat transfer coefficient of a given lithium battery is related to the discharge rate and the temperature of the heat exchange environment, and is less affected by the battery's initial temperature. The critical heat transfer coefficient increases sharply once the ambient temperature exceeds 293.15 K. A thermal management operation strategy based on the intervention time τ_intv is proposed for the working condition of h<h_cr to further improve the battery's thermal safety operation capability. Furthermore, the numerical determination method, influencing factors, and intervention effect of intervention time are thoroughly examined. The results show that the intervention time of the lithium battery for a given h is greatly affected by the discharge rate, and the reduced rate operation of the lithium battery during the intervention time can effectively control the battery temperature within a safe range This work has important theoretical implications for the design and operation management of the vehicle lithium battery thermal management system.

Key words: lithium-ion battery, thermal management, critical equivalent heat transfer coefficient, intervention time

CLC Number:

TM 911

Guoliang XU, Yujie ZHANG, Xiaoming HUANG, Rui HE. Thermal design and operation strategy of automotive lithium battery based on critical heat transfer coefficient and intervention time[J]. Energy Storage Science and Technology, 2021, 10(6): 2252-2259.

Figures/Tables 2

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