With the rapid development of renewable energy and the widespread application of electric vehicles，the application of battery energy storage systems in photovoltaic charging stations of electric vehicles plays a crucial role in improving charging efficiency，stabilizing the power grid，and achieving energy balance. This article conducts research on the evaluation methods of battery energy storage systems in photovoltaic charging stations of electric vehicles，and proposes a comprehensive evaluation method for battery energy storage systems based on fuzzy evaluation. Firstly，a series solar cell structure was proposed and a mathematical model was established to analyze the charging and health status of energy storage batteries. Based on the battery model of the charging station energy storage system，a future life prediction method for battery detection in the photovoltaic charging station energy storage system of electric vehicles is further proposed. Finally，using the battery detection results，a comprehensive evaluation of the battery energy storage system is conducted based on the fuzzy evaluation method. This method can provide comprehensive and accurate evaluation results for battery energy storage systems，helping decision-makers make scientific decisions.