Battery charging method and battery management system

The invention discloses a battery charging method and a battery management system. The method comprises the following steps: under the condition that a battery is connected to a power supply, determining an initial current according to an initial charge state of the battery and an initial temperature of the battery; determining the maximum charging current of the battery from the initial state of charge to 100% state of charge according to the initial state of charge and the initial temperature; determining a plurality of preset currents according to a preset charging current interval and the maximum charging current; wherein the maximum current in the plurality of preset currents is the same as the maximum charging current; processing the plurality of preset currents by adopting the initial current to obtain a plurality of residual charging durations; determining a target charging request current according to a preset current used for determining the minimum residual charging duration in the plurality of residual charging durations; and charging the battery according to the target charging request current. According to the invention, the charging duration of the battery can be reduced.