Searching for thermal shutdown separators in lithium-ion batteries: Paradigm and practice

Hu，Wenting1; Zhu，Guoqing1; Chi，Fuxin1; Su，Longxing1,2; Zhu，Yuan1

2025

10.1016/j.ijheatmasstransfer.2024.126248

International Journal of Heat and Mass Transfer   影响因子和分区

0017-9310

This paper focuses on the thermal shutdown separators for thermal runaway control in lithium-ion batteries (LIB). In electrical cars (EV), thermal runaway is the most catastrophic and life-threatening failure mode. Here we reexamined 17 reported phase-change-based thermal shutdown separators and suggested a new design paradigm for thermal shutdown separators of EV level batteries. Through accelerating rate calorimeter (ARC), we have obtained the thermal response curves of three typical EV level batteries: LFP 18,650 battery, NCM 18,650 battery and NCM pouch battery and summarized their critical temperatures. Taking NCM pouch battery as an example, we formed a searching zone for the 17 phase-change-based thermal shutdown separators and found that only 7 of them falling into the promising zone. After analysis on these 7 composite materials, we designed a new trial composite material PBS/PI, which turned out successful in all the following thermal and electrochemical tests. Moreover, we are aware from the beginning that all the reported materials are only tested in button batteries and may not as well apply to EV level batteries. Our own practice has also shown this discrepancy. Thereby we employed thermal simulation to help mapping the discrepancy between the button battery and pouch battery. The results shows that the thermal shutdown happens much earlier in the button battery when elevating the temperature, which tricks researchers into misjudging the material feasibility. This work offers avenues for the searching of thermal shutdown separators in EV level batteries.

Pouch battery Separator Simulation Thermal shutdown

英语

第一 ; 通讯

2-s2.0-85205270016

Scopus

1.School of Microelectronics,Southern University of Science and Technology,Shenzhen,518055,China
2.International School of Microelectronics,Dongguan University of Technology,Dongguan,523808,China

Hu，Wenting,Zhu，Guoqing,Chi，Fuxin,et al. Searching for thermal shutdown separators in lithium-ion batteries: Paradigm and practice[J]. International Journal of Heat and Mass Transfer,2025,236.

Hu，Wenting,Zhu，Guoqing,Chi，Fuxin,Su，Longxing,&Zhu，Yuan.(2025).Searching for thermal shutdown separators in lithium-ion batteries: Paradigm and practice.International Journal of Heat and Mass Transfer,236.

Hu，Wenting,et al."Searching for thermal shutdown separators in lithium-ion batteries: Paradigm and practice".International Journal of Heat and Mass Transfer 236(2025).