There are many reasons for the fast and slow charging of trams in winter, mainly involving battery temperature, temperature difference, air intake and exhaust port blockage, circuit failure, battery health and so on.
Specifically, when the battery temperature is low, its charge and discharge performance will be affected, resulting in slower charging. At the same time, the heat of the sun in winter is less, and the temperature at night may plummet, resulting in a more drastic temperature difference, which will also affect the charge and discharge cycle of the battery. In addition, if the vehicle is covered with snow, it may cause the gas activity inside the vehicle to be hindered, and the internal blockage of the air intake and exhaust ports will affect the heat dissipation and charging effect of the battery. Hot and cold temperatures have an impact on circuit performance, and if the circuit control fails, it will also affect the charge and discharge of the battery. If the vehicle is used for a long time, the health of the battery may be reduced, thus affecting the charging effect of the battery. During the charging process, external interference such as wind and lightning may also affect the charging effect of the battery. Therefore, in order to improve the charging speed of the tram in winter, you can try to park the vehicle in a warm place, or preheat the battery to increase the temperature and activity of the battery. At the same time, regular maintenance and inspection of the vehicle to ensure that the health of the circuit and battery is good, also helps to improve the charging speed and efficiency.