高功率钛酸锂电池性能研究

Performance of High Power Lithium Titanate Battery

为了更好地满足航空、军事以及能源器件对于高功率化学电源的需求,对LTT65系列电池进行了优化,控制原有电池其他参数不变的同时,使得内部颗粒变小,优化后的电池对于放电倍率进行了提升。针对改进后的电池,首先对于电池的放电性能进行测试,得到放电深度的具体数值,其次根据电池放电后的电压回升问题通过HPPC(hybrid pulse power characteristic)方法对于内阻进行测试和计算。结果表明:电池在高SOC(state of charge)状态下内阻伴随着放电率的增加而减小,电池在较低SOC状态下内阻增加,呈现出一定的复杂趋势。最后对于该倍率状态下的电池温升进行分析,得到了电池温度会随着电池放电倍率的增加将会出现拐点的结论,电池的温度拐点出现在45℃,最大温度值为63℃,温升值为38℃,而后根据实验结果对于电池不同倍率下的温升、热功率等参数进行测定,对于电池的放热特性进行了整体研究。

In order to better meet the needs of high-power chemical power sources for aviation,military and energy devices,the LTT65 series battery was optimized by controlling the other parameters of the original battery and made the internal particles smaller,so that the discharge rate of the optimized battery can be improved.For the improved battery,firstly the discharge performance of the battery was tested to obtain the specific value of the depth of discharge,and then the internal resistance was tested and calculated by the hybrid pulse power characteristic(HPPC)method according to the voltage recovery problem after the battery was discharged.The results show that the internal resistance of the battery decreases with the increase of the discharge rate in the high state of charge(SOC)state,and the internal resistance of the battery increases in the lower SOC state,showing a certain complex trend.Finally,the temperature rise of the battery was analyzed in this multiplier state,and it is concluded that the battery temperature will have an inflection point with the increase of the battery discharge rate.The temperature inflection point of the battery occurs at 45℃,with a maximum temperature value of 63℃and a temperature rise value of 38℃,then according to the experimental results,the temperature rise,thermal power and other parameters of the battery at different rates were measured,the exothermic characteristics of the battery were studied as a whole.