Cause Analysis of Thermal Runaway Failure in LFP Battery Energy Storage System under Overheating Condition

2023 IEEE 14th International Symposium on Power Electronics for Distributed Generation Systems (PEDG) Pub Date : 2023-06-09 DOI:10.1109/PEDG56097.2023.10215155

Aiguo Wang, Sicong Chen, Xinqiang Li

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Abstract

This paper focuses on an industrial and commercial outdoor ground-mounted energy storage system composed of 280Ah LFP (Abbreviation for LiFePO4) batteries. The thermal runaway and thermal propagation characteristics of LFP batteries caused by heating under the condition of 100% SOC is studied. A flame ionization detector and a palladium-nickel alloy sensor were used to measure the concentration changes of THC, CO, CO2, O2 and hydrogen inside the energy storage system during the thermal runaway process. The test results showed that the cells close to the heat source will undergo thermal runaway first, followed by thermal propagation between the cells. If flammable gas generated when the cells undergo thermal runaway accumulates in the energy storage system, it is easy to cause the fire hazard. Reducing the concentration of flammable gases inside the energy storage system and improving the maximum operation temperature of insulating materials would help to prevent the risk of fire and explosion.

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过热条件下LFP电池储能系统热失控故障原因分析

本文研究了一种由280Ah LFP (LiFePO4的缩写)电池组成的工商业户外地面储能系统。研究了LFP电池在100%荷电状态下受热引起的热失控和热传播特性。采用火焰电离检测器和钯镍合金传感器测量了热失控过程中储能系统内部THC、CO、CO2、O2和氢气的浓度变化。实验结果表明，靠近热源的电池首先发生热失控，然后在电池之间进行热传播。蓄电池热失控时产生的可燃气体在储能系统中积累，容易造成火灾隐患。降低储能系统内部可燃气体的浓度，提高绝缘材料的最高工作温度，有助于防止发生火灾和爆炸的危险。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

2023 IEEE 14th International Symposium on Power Electronics for Distributed Generation Systems (PEDG)

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