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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