Lithium battery : diagnostics and lifespan.application to the range estimation of an electric vehicle

Electric vehicles have a relatively long charging time and a relatively short range. Estimating avehicle’s consumption and range is therefore crucial. Range will depend on the average speed, top speeds,ascent and descent, battery temperature and battery condition. Judging the range of a vehicle is thus not adirectly linear function of the distance to cover. This nonlinearity leads to mistrust, where a user cannot havetotal confidence in electric vehicles (bicycle, scooter, car ...). Moreover, the fail of only one cell of the batterycan reduce drastically the range or even lead the vehicle to stop. The user must be able to diagnose the batteryand its state of health to see if the proposed trip is feasible. This article presents a simple strategy to monitor thebehavior of the battery during charge and discharge and provides a quick diagnosis of each element and also ofthe whole battery. Then, it’s possible to determine the range remaining in a vehicle’s battery based on all theabove parameters. To find out if a vehicle can make a given journey without recharging, a web application forestimating the vehicle’s consumption was completed and successfully tested.