高功率钛酸锂电池性能分析与散热研究

Performance Analysis and Heat Dissipation Study of High-power Lithium Titanate Battery

为了更好地满足航空、军事工业发展对高功率化学电源的需求,对高功率钛酸锂电池的性能进行了分析。通过对单体电池和电池模组不同倍率进行放电测试,明确电池电压的回升问题。同时对高功率钛酸锂电池进行散热研究,对电池模组散热方式进行设计,解决电池模组高倍率下放电引起的温升问题。针对自然散热状态下散热时间较慢及散热效果不明显的问题,通过试验与仿真相结合,确认自然散热状态下电池中心最高温度为69.87℃,加入液冷后最高温度下降为63.25℃,所需散热时间从自然散热状态45 min温度降低为48.87℃缩短到液冷散热方式25 min温度降低为35.06℃,由此验证液冷散热在高倍率放电状态下的效果。

In order to better meet the demand for high-power chemical power source in the development of aviation and military industries,the performance of high-power lithium titanate battery was analyzed.By conducting discharge tests at different rates of single cell and battery module,the issue of battery voltage recovery was clarified.At the same time,the heat dissipation research of high-power lithium titanate battery was carried out,and the heat dissipation mode of the battery module was designed to solve the temperature rise problem caused by the discharge of the battery module at high rate.In view of the problem that the heat dissipation time is slower than that under the natural heat dissipation state and the heat dissipation effect is not obvious,through the combination of test and simulation,it is confirmed that the maximum temperature of the battery center under the natural heat dissipation state is 69.87℃,and the maximum temperature drops to 63.25℃ after adding liquid cooling.The required heat dissipation time is reduced from 48.87℃ at the beginning of 45 min in the natural heat dissipation state to 25 min,35.06℃ in the liquid-cooled heat dissipation method,thereby verifying the effect of liquid-cooled heat dissipation in the high rate discharge state.