Charging control method and device for hybrid electric vehicle and vehicle

A device for charging control of a hybrid electric vehicle, comprising:

• a processor;
• and
• a memory, wherein the memory is configured to store a computer program, and the computer program is executable by the processor to perform operations comprising:
• receiving a charging instruction;
• acquiring a first voltage of a power battery and a second voltage of a storage battery in response to receiving the charging instruction;
• determining whether the first voltage is less than a first voltage threshold and the second voltage is less than a second voltage threshold;
• in response to determining that the first voltage is less than the first voltage threshold and the second voltage is less than the second voltage threshold, disconnecting an On Board Charger (OBC) from the power battery and charging the storage battery through the OBC and a DC-DC converter (DC) for a charging duration, wherein:
• the OBC comprises a Power Factor Correction (PFC) circuit, a first capacitor, an inductances-capacitor resonant converter (LLC), and a second capacitor connected in sequence;
• the PFC circuit is connected with a charging port of the hybrid electric vehicle, and the second capacitor is connected with a precharge circuit of the hybrid electric vehicle and the DC;
• and the charging the storage battery through the OBC and the DC for the charging duration comprises:
• starting the PFC circuit to charge the first capacitor;
• in response to that a voltage of the first capacitor reaches a third voltage threshold, starting the LLC to charge the second capacitor;
• and
• in response to that a voltage of the second capacitor reaches a fourth voltage threshold, determining that the OBC enters a constant voltage mode and starting the DC to charge the storage battery;
• and
• in response to that the charging duration of the storage battery reaches a duration threshold, connecting the OBC to the power battery and charging the power battery through the OBC.

A vehicle, comprising a device for charging control of the vehicle, the device comprising a processor and a memory, wherein the memory is configured to store a computer program, and the processor is configured to execute the computer program to perform operations comprising:

• receiving a charging instruction;
• acquiring a first voltage of a power battery and a second voltage of a storage battery in response to receiving the charging instruction;
• determining whether the first voltage is less than a first voltage threshold and the second voltage is less than a second voltage threshold;
• in response to determining that the first voltage is less than the first voltage threshold and the second voltage is less than the second voltage threshold, disconnecting an On Board Charger (OBC) from the power battery and charging the storage battery through the OBC and a DC-DC converter (DC) for a charging duration, wherein:
• the OBC comprises a Power Factor Correction (PFC) circuit, a first capacitor, an inductances-capacitor resonant converter (LLC), and a second capacitor connected in sequence;
• the PFC circuit is connected with a charging port of the vehicle, and the second capacitor is connected with a precharge circuit of the vehicle and the DC;
• and the charging the storage battery through the OBC and the DC for the charging duration comprises:
• starting the PFC circuit to charge the first capacitor;
• in response to that a voltage of the first capacitor reaches a third voltage threshold, starting the LLC to charge the second capacitor;
• and
• in response to that a voltage of the second capacitor reaches a fourth voltage threshold, determining that the OBC enters a constant voltage mode and starting the DC to charge the storage battery;
• and
• in response to that the charging duration of the storage battery reaches a duration threshold, connecting the OBC to the power battery and charging the power battery through the OBC.