Battery charging control method, device and system

The invention discloses a battery charging control method, device and system, and the control method applied to a charger comprises the steps of outputting a charging current to a battery management system to enable the battery management system to divide the charging current into a first current and a second current, wherein the first current is used for charging a to-be-charged battery, and the second current is used for supplying power to a load; detecting whether a charging interface of the to-be-charged battery is closed or not every first preset time; and if the charging interface is not closed, increasing the charging current by a first preset adjustment value, so that the battery management system increases the first current by the first preset adjustment value to charge the to-be-charged battery. According to the invention, the charging current can be adjusted according to the safety current of the battery cells made of different materials at different temperatures, the service life of the battery is