Charging control method for low-voltage accumulator of electric automobile

The invention discloses a charging control method for a low-voltage accumulator of an electric automobile, and belongs to the technical field of automobile accumulators. The charging control method comprises the following steps of periodically awaking a vehicle control unit, and detecting the voltage of the low-voltage accumulator; if the situation that the voltage of the low-voltage accumulator is lower than a set charging floor voltage value is detected, awaking a battery management system and a DC/DC converter, and enabling the battery management system to detect the residual electric quantity of a high-voltage accumulator; when the vehicle control unit receives information, sent by the battery management system, that the residual electric quantity energy of a high-voltage accumulator system is greater than 15%, starting a high-voltage electrifying process; after the high-voltage electrifying is successful, enabling the vehicle control unit to send a charging instruction to the DC/DC converter, so that the low-voltage accumulator is charged by the DC/DC converter; and if the situation that the vehicle control unit detects that the voltage of the low-voltage accumulator is greater than a set charging ceiling voltage valve, stopping charging the low-voltage accumulator. According to the charging control method disclosed by the invention, the problem of overdischarging of the accumulator of the electric automobile can be solved.