Analysis of Health Status of Battery in Electric Bus Based on Operational Big Data

Real-time information on the health status of electric bus batteries is the key to ensuring the safe operation of urban bus services. Based on the operation data of more than 20,000 electric buses during two years, this study constructs an estimation model, analyzes the battery health of the pure electric buses in use, and compares its results with the battery fault alarm information. It is found that the failure rate of vehicles produced in 2019 compared to those produced in 2018 had decreased, showing the technology level had improved. With the increase in vehicle operating hours, the vehicle health status had decreased, reminding the industry to pay attention to battery health status tracking. The model judgment results had significant differences with the failure alarm results, indicating that the battery health status could not be objectively judged by the failure alarm information alone.