Effect of Separator Adhesive Layer Materials on the Safety of Lithium Iron Phosphate Battery

doi:10.3969/j.issn.1008-0198.2025.05.006

Abstract

Abstract: To address the safety issues of 280 A·h lithium iron phosphate batteries for energy storage, a comparative analysis of the effects of polyvinylidene fluoride (PVDF) and polymethyl methacrylate (PMMA) as separator adhesive layer materials on the safety performance of batteries under overcharging, external heating, and needle-puncture abuse conditions is performed. The results show that batteries with PVDF adhesive layers exhibit superior safety characteristics under all three abuse conditions: the activation time of the safety valve is delayed by 0.1~7.5 minutes, and the voltage drop time is postponed by 0.1-10.5 minutes. Following thermal runaway, the maximum temperature is decreased by 11℃, 1.5℃, and 16.7℃, respectively, while the maximum temperature rise rate is reduced by 0.11~3.18℃/s. This study provides critical experimental data for separator material selection and safety optimization in energy storage batteries.

Key words: lithium-ion battery, safety, energy storage, overcharge, external heating, nail penetration

CLC Number:

TM911

LIU Jingju, CHEN Luojia, WANG Jiangfeng, CHEN Baohui, WU Chuanping. Effect of Separator Adhesive Layer Materials on the Safety of Lithium Iron Phosphate Battery[J]. Hunan Electric Power, 2025, 45(5): 41-46.

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