Method and system for controlling battery swapping of vehicle, and vehicle

1 . A method for controlling battery swapping of a vehicle, the vehicle comprising a vehicle control unit (VCU), a bidirectional DC-DC converter assembly, a power battery pack, and a storage battery, the bidirectional DC-DC converter assembly having a buck mode and a boost mode, the bidirectional DC-DC converter assembly being in the buck mode when the vehicle is in a high-voltage power-on state, the power battery pack being configured to supply power to a vehicle load of the vehicle and charge the storage battery through the bidirectional DC-DC converter assembly, and the method comprising:

receiving, by the VCU, a battery swapping instruction when the vehicle is in the high-voltage power-on state;

transmitting, by the VCU, a switching instruction to the bidirectional DC-DC converter assembly in response to the battery swapping instruction;

disabling, by the bidirectional DC-DC converter assembly, the buck mode in response to the switching instruction to cut off electrical connection between the power battery pack and a high-voltage circuit of the vehicle by a battery controller, and enabling the boost mode in response to the switching instruction to supply power to the vehicle load by the storage battery through the bidirectional DC-DC converter assembly;

transmitting, by the bidirectional DC-DC converter assembly, a boost confirmation message to the battery controller through the VCU; and

cutting off, by the battery controller, the electrical connection between the power battery pack and the high-voltage circuit of the vehicle in response to the boost confirmation message.

2 . The method according to claim 1 , wherein the enabling the boost mode comprises:

obtaining, by the bidirectional DC-DC converter assembly, a current total voltage of the power battery pack as a target boost value, and enabling the boost mode with the target boost value, wherein a voltage value inputted by the storage battery to the vehicle load through the bidirectional DC-DC converter assembly is close to the target boost value.

3 . The method according to claim 1 , wherein the cutting off, by the battery controller, the electrical connection between the power battery pack and the high-voltage circuit of the vehicle in response to the boost confirmation message comprises:

disconnecting positive and negative discharge electrode contactors of the power battery pack, and disconnecting positive and negative electrode contactors of the high-voltage circuit of the vehicle.

4 . The method according to claim 1 , further comprising:

detecting, by the battery controller, a new power battery pack being connected to the vehicle;

closing, by the battery controller, positive and negative discharge electrode contactors of the new power battery pack, and feeding back a connection message to the VCU;

transmitting, by the VCU, the connection message to the bidirectional DC-DC converter assembly; and

disabling, by the bidirectional DC-DC converter assembly, the boost mode and enabling the buck mode in response to the connection message.

5 . The method according to claim 4 , wherein the connection message comprises a total voltage of the new power battery pack, and the method further comprises, before the disabling, by the bidirectional DC-DC converter assembly, the boost mode and enabling the buck mode according to the connection message:

determining, by the bidirectional DC-DC converter assembly, the total voltage of the new power battery pack as a new target value;

adjusting, by the bidirectional DC-DC converter assembly, the boost mode with the new target value, wherein an input voltage inputted by the bidirectional DC-DC converter assembly to the vehicle load is close to the new target value.

6 . The method according to claim 5 , further comprising: after adjusting the boost mode with the new target value,

feeding back, by the bidirectional DC-DC converter assembly, a mode adjustment confirmation message to the VCU;

transmitting, by the VCU, the mode adjustment confirmation message to the battery controller; and

closing, by the battery controller, the positive and negative electrode contactors of the high-voltage circuit in response to the mode adjustment confirmation message.

7 . The method according to claim 4 , further comprising: after the disabling, by the bidirectional DC-DC converter assembly, the boost mode and enabling the buck mode according to the connection message,

feeding back, by the bidirectional DC-DC converter assembly, a battery swapping completion confirmation message to the VCU.

8 . A system for controlling battery swapping of a vehicle, comprising a vehicle control unit (VCU), a bidirectional DC-DC converter assembly, a battery controller, a power battery pack, and a storage battery, the bidirectional DC-DC converter assembly having a buck mode and a boost mode; the bidirectional DC-DC converter assembly being in the buck mode when the vehicle is powered on, and the power battery pack being configured to supply power to a vehicle load of the vehicle and charge the storage battery through the bidirectional DC-DC converter assembly, wherein

the VCU is configured to receive a battery swapping instruction when the vehicle is in a high-voltage power-on state, and to transmit a switching instruction to the bidirectional DC-DC converter assembly in response to the battery swapping instruction;

the bidirectional DC-DC converter assembly is configured to disable the buck mode and enable the boost mode in response to the switching instruction, and transmit a boost confirmation message to the battery controller through the VCU;

the battery controller is configured to cut off electrical connection between the power battery pack and a high-voltage circuit of the vehicle in response to the boost confirmation message; and

the storage battery is configured to supply power to the vehicle load through the bidirectional DC-DC converter assembly.

9 . A vehicle, comprising a system for controlling battery swapping of the vehicle, the vehicle comprising a vehicle control unit (VCU), a bidirectional DC-DC converter assembly, a power battery pack, and a storage battery, the bidirectional DC-DC converter assembly having a buck mode and a boost mode, the bidirectional DC-DC converter assembly being in the buck mode when the vehicle is in a high-voltage power-on state, the power battery pack being configured to supply power to a vehicle load of the vehicle and charge the storage battery through the bidirectional DC-DC converter assembly, and the vehicle being configured to perform operations comprising:

receiving, by the VCU, a battery swapping instruction when the vehicle is in the high-voltage power-on state;

transmitting, by the VCU, a switching instruction to the bidirectional DC-DC converter assembly in response to the battery swapping instruction;

disabling, by the bidirectional DC-DC converter assembly, the buck mode in response to the switching instruction to cut off electrical connection between the power battery pack and a high-voltage circuit of the vehicle by a battery controller, and enabling the boost mode in response to the switching instruction to supply power to the vehicle load by the storage battery through the bidirectional DC-DC converter assembly,

transmitting, by the bidirectional DC-DC converter assembly, a boost confirmation message to the battery controller through the VCU; and

cutting off, by the battery controller, the electrical connection between the power battery pack and the high-voltage circuit of the vehicle in response to the boost confirmation message.

10 . The vehicle according to claim 9 , wherein the enabling the boost mode comprises:

obtaining, by the bidirectional DC-DC converter assembly, a current total voltage of the power battery pack as a target boost value, and enabling the boost mode with the target boost value, wherein a voltage value inputted by the storage battery to the vehicle load through the bidirectional DC-DC converter assembly is close to the target boost value.

11 . The vehicle according to claim 9 , wherein the cutting off, by the battery controller, the electrical connection between the power battery pack and the high-voltage circuit of the vehicle in response to the boost confirmation message comprises:

disconnecting positive and negative discharge electrode contactors of the power battery pack, and disconnecting positive and negative electrode contactors of the high-voltage circuit of the vehicle.

12 . The vehicle according to claim 9 , wherein the operations further comprise:

detecting, by the battery controller, a new power battery pack being connected to the vehicle;

closing, by the battery controller, positive and negative discharge electrode contactors of the new power battery pack, and feeding back a connection message to the VCU;

transmitting, by the VCU, the connection message to the bidirectional DC-DC converter assembly; and

disabling, by the bidirectional DC-DC converter assembly, the boost mode and enabling the buck mode in response to the connection message.

13 . The vehicle according to claim 12 , wherein the connection message comprises a total voltage of the new power battery pack, and the operations further comprise, before the disabling, by the bidirectional DC-DC converter assembly, the boost mode and enabling the buck mode according to the connection message:

determining, by the bidirectional DC-DC converter assembly, the total voltage of the new power battery pack as a new target value;

adjusting, by the bidirectional DC-DC converter assembly, the boost mode with the new target value, wherein an input voltage inputted by the bidirectional DC-DC converter assembly to the vehicle load is close to the new target value.

14 . The vehicle according to claim 13 , wherein the operations further comprise:

after adjusting the boost mode with the new target value, feeding back, by the bidirectional DC-DC converter assembly, a mode adjustment confirmation message to the VCU;

transmitting, by the VCU, the mode adjustment confirmation message to the battery controller; and

closing, by the battery controller, the positive and negative electrode contactors of the high-voltage circuit in response to the mode adjustment confirmation message.

15 . The vehicle according to claim 12 , wherein the operations further comprise: after the disabling, by the bidirectional DC-DC converter assembly, the boost mode and enabling the buck mode according to the connection message,

feeding back, by the bidirectional DC-DC converter assembly, a battery swapping completion confirmation message to the VCU.