磷酸铁锂电池内阻测量目前大多存在耗时长、测量结果不连续等问题。文章提出一种新型的内阻测量方法——双倍率曲线法。基于该方法,对不同温度下电池内阻进行测量并进行误差分析。结合误差分析结果发现,该测量方法的适用放电状态（state of discharge, SoD）区间为5% ~ 90%。对该区间内平均内阻与温度之间的关系进行定量分析,得到平均内阻随温度变化的关系式。相比于以往的其他测量方法,该方法的提出能够有效缩短内阻测量时耗,可为在线内阻测量的实现提供一定的研究基础。
Currently, most of LiFePO4 battery resistance measurements are time-consuming and discontinuous. In this paper, a new type of internal resistance measurement method—double rate curves method was proposed. Based on this method, the internal resistances of the battery at different temperatures were measured, and the error of this method was analyzed. Results showed that the reliable state of discharge (SoD) region of internal resistance was in the range of 5% ~ 90%. The relationship between average internal resistances and temperature in this SoD range during discharge was analyzed quantitatively, and an equation of average internal resistance versus temperature was obtained. Compared with other methods, the time consuming of this method was largely shorten, which may goes a further step for the real-time measurement of internal resistance.
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