储能电站用锂离子电池热失控早期预警参数研究

讨论储能用磷酸铁锂电池在过充条件下的电压、表面温度以及所释放特征气体浓度特征参数变化规律，分析热失控机理、发展过程和早期预警阈值。实验结果表明：过充可促发电池内部一系列放热化学反应，引起温度、电压升高并伴有大量可燃气体产生，其中H2 含量最高且最先被气体探测器感知；电池电压、表面温度和H2 质量浓度特征参数建议报警范围分别为：4.8～6.6V、60～116 ℃、20～50 mg/L。

Research on early warning parameters of thermal runaway of lithium ion battery for energy storage power station

The variation of characteristic parameters such as the voltage, surface temperature, and released gas concentration of lithium iron phosphate batteries for energy storage under over?charge condition were discussed. The thermal runaway mechanism, development process and early warning threshold were analyzed. The experimental results showed that overcharging can lead to a series of exothermic chemical reactions inside the battery,which causes increase in temperature and voltage, accompanied by a large amount of combustible gas production.The H2 is the highest in content in the mixed gas and is detected by the gas detector first. The recommended alarm ranges of battery voltage, surface temperature and H2 concentration are 4.8~6.6 V, 60~116 ℃ and 20~50mg/L, respectively.