【摘要】 利用加速量热仪(ARC)对经过1 C充放电循环100次后的18650型磷酸铁锂电池在不同SOC绝热条件的热特性进行研究,并对ARC实验后的电池进行解剖分析。结果表明:磷酸铁锂电池在10%SOC和50%SOC状态下升温至159泄压阀破裂降温,而后电池不再升温,未发生热失控;在100%SOC状态下159℃左右短暂降温,然后继续升温,从174℃开始升温速率持续升高,温度达到191℃时升温速率为1℃/min,在220℃时升温速率为2.4℃/min(0.04 K/s),随后温度急剧升高,最终发生热失控,最高温度达到340℃;随着SOC的增大ARC实验造成的电池质量损失随之增大,隔膜的受损程度也增大,10%SOC闭孔,50%SOC破损,100%SOC熔化。更多还原

【Abstract】 The thermal characteristics of 18650 type lithium iron phosphate batteries with different SOC adiabatic conditions were studied by means of accelerating rate calorimeter(ARC), and the batteries after ARC experiment were dissected. The results show that the lithium-iron phosphate batteries under 10%SOC and 50%SOC do not go into thermal runaway due to the pressure relief and heat dissipation of valves breaking down at 159 ℃. At 100% SOC,the temperature drops slightly at 159℃, and then keeps rising; from 174 ℃, the temperature heating rate continues to rise; when the temperature reaches 191℃, the heating rate is 1℃/min; when the temperature reaches 220 ℃, the heating rate is 2.4 ℃/min(0.04 K/s); soon afterwards, the temperature rises sharply, and the thermal runaway occurs following the maximum temperature of 340℃. With the increase of SOC, the mass loss of the battery caused by ARC experiment increases, and the damage degree of separator increases. The separator will close at 10% SOC, is damaged at 50% SOC, and is melted at 100% SOC.更多还原