Charging and discharging apparatus and battery charging method

A battery charging method performed by a charging and discharging apparatus comprising a bi-directional DC/DC converter and a control unit, the method comprising:

• receiving, by control unit, a first charging current value transmitted by a battery management system (BMS) of a battery, and controlling, by the control unit, the bi-directional DC/DC converter based on the first charging current value to charge the battery through an energy storage battery;
• receiving, by the control unit, a first discharging current value transmitted by the BMS, and controlling, by the control unit, the bi-directional DC/DC converter based on the first discharging current value to discharge a battery capacity of the battery to the energy storage battery, wherein the first discharging current value is a discharging current value transmitted by the BMS when a first accumulative charging amount of the battery is greater than or equal to a first accumulative charging amount threshold and a voltage of a battery cell of the battery does not exceed a full-charging voltage of the battery cell;
• receiving, by the control unit, a second charging current value transmitted by the BMS, and controlling, by the control unit, the bi-directional DC/DC converter based on the second charging current value to charge the battery through the energy storage battery, wherein the second charging current value is a charging current value transmitted by the BMS when a first accumulative discharging amount of the battery is greater than or equal to a first accumulative discharging amount threshold.

A charging and discharging apparatus, comprising:

• a bi-directional DC/DC converter;
• a processor;
• and
• a non-transitory memory storing a computer program that, when executed by the processor, causes the charging and discharging apparatus to perform a battery charging method, wherein the battery charging method comprises:
• receiving a first charging current value transmitted by a battery management system (BMS) of a battery and controlling the bi-directional DC/DC converter based on the first charging current value to charge the battery through an energy storage battery;
• receiving a first discharging current value transmitted by the BMS and controlling the bi-directional DC/DC converter based on the first discharging current value to discharge a battery capacity of the battery to the energy storage battery, wherein the first discharging current value is a discharging current value transmitted by the BMS when a first accumulative charging amount of the battery is greater than or equal to a first accumulative charging amount threshold and a voltage of a battery cell of the battery does not exceed a full-charging voltage of the battery cell;
• and
• receiving a second charging current value transmitted by the BMS and controlling the bi-directional DC/DC converter based on the second charging current value to charge the battery through the energy storage battery, wherein the second charging current value is a charging current value transmitted by the BMS when a first accumulative discharging amount of the battery is greater than or equal to a first accumulative discharging amount threshold.