Battery Capacity Determination of Electric Vehicle Under Variable Temperature Conditions

This paper presents an innovative test method for evaluating the effects of sudden temperature changes on battery capacity. Unlike existing test methods, this method aims to measure the discharge capacity of the battery during abrupt temperature variations using a single test approach. In the test conducted in this study, a fully charged battery was subjected to partial discharge after sudden temperature changes, and then the temperature was returned to the reference value, allowing the discharge to continue until the minimum voltage was reached. In this way, the effect of temperature fluctuations on the usable capacity was observed. Using the same test method, the battery was discharged to the minimum voltage at low temperatures. After the temperature was returned to the reference value, the discharge process continued, and as a result, it was observed that sudden changes in temperature had no effect on capacity. These findings provide a new methodological contribution that can be applied in the battery industry and battery modeling techniques.