Author:
Li D,Zhimao M,Mingsheng C
Abstract
Abstract
In order to determine the effect of temperature on the SOC estimation accuracy of the battery system, the electrical performance of the battery system was studied by charge/discharge and environmental testing equipment. When SOC is equal to or greater than 80%, the result shows larger error between the actual SOC of battery system and the recorded SOC of BMS system, which are 3.81% and 4.43% at -10 °C and 0 °C respectively, and the error is 2.41% at 25 C. The error between the actual SOC of battery system and the recorded SOC of BMS system tend to decrease firstly and then increase as the temperature increased, and the error is 0.31% at 25 C. In conclusion, temperature has a significant impact on the SOC estimation of battery system, the actual SOC of battery system shows a trend of rapid increase and followed by a rise slowly, while the recorded SOC of BMS system shows a trend of continuous increase, resulting in the error between the actual SOC and the recorded SOC. Besides, the minimum error of SOC estimation appears at 25 C.
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