CHARGING METHOD FOR STABLY CHARGING BATTERY AND EXTENDING POWER SUPPLY PERIOD FOR ELECTRIC VEHICLE

A charging method for stably charging battery and extending power supply period for an electric vehicle includes: providing, according to a required voltage of a driving motor of an electric vehicle, a first battery group, which includes at least two electrically connected first batteries having a first internal resistance; separately providing at least one second battery, which has a voltage equal to a voltage of the first batteries and has a second internal resistance; electrically connecting each first battery of which a difference between the first internal resistance and the second internal resistance is less than or equal to 1.5Ω to the second battery; and charging the first battery group and the second battery, with a charging termination point being set as a voltage value of 75%-95% of an average voltage of the first battery group and a voltage value of 75%-95% of the voltage of the second battery.