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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

A novel battery heating strategy utilizing the sub-cooling of phase change materials

Ziye Ling
The Key Lab of Enhanced Heat Transfer and Energy Conservation, Ministry of Education, School of Chemistry and Chemical Engineering, South China University of Technology, Wushan Road 381, Guangzhou 510640, China

Zheng Guo Zhang
The Key Lab of Enhanced Heat Transfer and Energy Conservation, Ministry of Education, School of Chemistry and Chemical Engineering, South China University of Technology, Wushan Road 381, Guangzhou 510640, China

Xiaoming Fang
The Key Lab of Enhanced Heat Transfer and Energy Conservation, Ministry of Education, School of Chemistry and Chemical Engineering, South China University of Technology, Wushan Road 381, Guangzhou 510640, China

Xuenong Gao
The Key Lab of Enhanced Heat Transfer and Energy Conservation, Ministry of Education, School of Chemistry and Chemical Engineering, South China University of Technology, Wushan Road 381, Guangzhou 510640, China

Abstract

Phase change materials (PCMs) can store thermal energy and keeps Li-ion batteries operated under cold environment in better thermal conditions for a long period, which improves the battery performance. But the extra thermal mass brought by PCMs prevents batteries from heating rapidly at the beginning of operation and causes start-up problems. This work intends to utilize the sub-cooling of calcium chloride hexahydrate (CaCl2·6H2O) to heat a battery up to the phase change temperature instantly. First, the CaCl2·6H2O with stable sub-cooling is prepared, with 1wt% carboxyl methyl cellulose (CMC) added into the hydrated salt. Then the thermophysical properties such as phase change temperature, phase change enthalpy, sub-cooling degree, etc., are measured. At last, the PCM with sub-cooling is successfully used to heat a Li-ion battery from 7 °C up to 30 °C in less than 10 s. The operating voltage and discharge capacity of this battery with nominal capacity of 2.6Ah is increased by 0.2V and 0.1 Ah.

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