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Batteries 2016, 2(2), 12; doi:10.3390/batteries2020012

The Evolution of Lithium-Ion Cell Thermal Safety with Aging Examined in a Battery Testing Calorimeter

1
Sate Key Laboratory of Automotive Safety and Energy, Department of Automotive Engineering, Tsinghua University, Beijing 100084, China
2
Beijing Co-Innovation Center for Electric Vehicles, Beijing Institute of Technology, Beijing 100081, China
3
CITIC Guo’an MGL Power Technology Co., Ltd., Beijing 102200, China
*
Author to whom correspondence should be addressed.
Academic Editor: Andreas Jossen
Received: 28 February 2016 / Revised: 6 April 2016 / Accepted: 11 April 2016 / Published: 14 April 2016
(This article belongs to the Special Issue Battery Safety)
View Full-Text   |   Download PDF [3001 KB, uploaded 15 April 2016]   |  

Abstract

The effect of calendar aging on the thermal safety of 4.6 Ah pouch cells with a LiMn2O4 (LMO) cathode was investigated by a battery test calorimeter (BTC) that can be used to determine the heat evolved during an uncontrolled exothermic runaway reaction. Cells were stored at 55 °C and 100% state of charge (SOC) for accelerated aging, and they were taken out after 10, 20, 40, 68, and 90 days of storage to obtain different aging states. Those cells were then put into the BTC for thermal safety tests. The results show the cell thermal safety improves after aging: (1) the self-heating temperature increases; (2) the thermal runaway temperature increases; and (3) the exothermal rate during the process of thermal runaway decreases. The cell voltage drops to zero about 40 °C earlier than the thermal runaway, indicating the voltage can be used as a signal for cell safety monitoring. View Full-Text
Keywords: lithium-ion cell; thermal safety; calendar aging; battery test calorimeter (BTC) lithium-ion cell; thermal safety; calendar aging; battery test calorimeter (BTC)
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Zhang, J.; Su, L.; Li, Z.; Sun, Y.; Wu, N. The Evolution of Lithium-Ion Cell Thermal Safety with Aging Examined in a Battery Testing Calorimeter. Batteries 2016, 2, 12.

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