Electric vehicle battery voltage regulation system and control method and control apparatus therefor

1. A control method for an electric vehicle battery voltage regulation system, characterized in that

the electric vehicle battery voltage regulation system comprises an electric vehicle battery, a motor, a bridge module, and a switch assembly; wherein

the electric vehicle battery comprises a first electric vehicle battery group and a second electric vehicle battery group;

the bridge module comprises a first leg and a second leg set, the first leg and all legs in the second leg set each comprise an upper leg and a lower leg, a joint between the upper leg and the lower leg of the first leg is connected to a joint of all windings of the motor, and joints between upper legs and lower legs of all the legs in the second leg set are connected to all the windings of the motor, respectively; and

the switch assembly comprises a first switch, a second switch, a third switch, a fourth switch, and a fifth switch, wherein one end of the first switch is connected to a positive terminal of a charge/discharge module, the other end of the first switch is connected to the upper leg of the first leg, one end of the second switch is connected to a joint of the upper legs of all the legs in the second leg set, the other end of the second switch is connected to a positive terminal of the first electric vehicle battery group, one end of the third switch is connected to the lower leg of the first leg, the other end of the third switch is connected to a negative terminal of the charge/discharge module, one end of the fourth switch is connected to a negative terminal of the first electric vehicle battery group, the other end of the fourth switch is connected to a positive terminal of the second electric vehicle battery group, one end of the fifth switch is connected to the negative terminal of the first electric vehicle battery group, and the other end of the fifth switch is connected to a joint of the lower legs of all the legs in the second leg set; and

the control method comprises:

controlling the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the first leg, and the second leg set to turn on or off, to form in a first period a circuit loop for the charge/discharge module to discharge to the motor and to form in a second period a circuit loop for the charge/discharge module and the motor to charge the first electric vehicle battery group and the second electric vehicle battery group or form in the second period a circuit loop for the motor to charge the first electric vehicle battery group and the second electric vehicle battery group; or

controlling the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the first leg, and the second leg set to turn on or off, to form in a third period a circuit loop for the first electric vehicle battery group and the second electric vehicle battery group to discharge to the motor and to form in a fourth period a circuit loop for the first electric vehicle battery group, the second electric vehicle battery group, and the motor to discharge to the charge/discharge module or form in the fourth period a circuit loop for the motor to discharge to the charge/discharge module.

2. The control method according to claim 1 , characterized in that

the controlling the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the first leg, and the second leg set to turn on or off, to form in a first period a circuit loop for the charge/discharge module to discharge to the motor and to form in a second period a circuit loop for the charge/discharge module and the motor to charge the first electric vehicle battery group and the second electric vehicle battery group comprises:

controlling, in the first period, the first switch, the second switch, the third switch, and the fourth switch to turn on, the fifth switch to turn off, the upper leg of the first leg and all the lower legs of the second leg set to turn on, and the lower leg of the first leg and all the upper legs of the second leg set to turn off, to form a circuit loop comprising the upper leg of the first leg, all the windings of the motor, all the lower legs of the second leg set, and the charge/discharge module, for the charge/discharge module to discharge to the motor; and

controlling, in the second period, the first switch, the second switch, the third switch, and the fourth switch to turn on, the fifth switch to turn off, the upper leg of the first leg and all the upper legs of the second leg set to turn on, and the lower leg of the first leg and all the lower legs of the second leg set to turn off, to form a circuit loop comprising the upper leg of the first leg, all the windings of the motor, all the upper legs of the second leg set, the first electric vehicle battery group, the second electric vehicle battery group, and the charge/discharge module, for the charge/discharge module and the motor to charge the first electric vehicle battery group and the second electric vehicle battery group.

3. The control method according to claim 1 , characterized in that

the controlling the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the first leg, and the second leg set to turn on or off, to form in a first period a circuit loop for the charge/discharge module to discharge to the motor and to form in the second period a circuit loop for the motor to charge the first electric vehicle battery group and the second electric vehicle battery group comprises:

controlling, in the first period, the first switch, the second switch, the third switch, and the fourth switch to turn on, the fifth switch to turn off, the upper leg of the first leg and all the lower legs of the second leg set to turn on, and the lower leg of the first leg and all the upper legs of the second leg set to turn off, to form a circuit loop comprising the upper leg of the first leg, all the windings of the motor, all the lower legs of the second leg set, and the charge/discharge module, for the charge/discharge module to discharge to the motor; and

controlling, in the second period, the first switch, the second switch, the third switch, and the fourth switch to turn on, the fifth switch to turn off, the lower leg of the first leg, and all the upper legs of the second leg set to turn on, and the upper leg of the first leg and all the lower legs of the second leg set to turn off, to form a circuit loop comprising the lower leg of the first leg, all the windings of the motor, all the upper legs of the second leg set, the first electric vehicle battery group, and the second electric vehicle battery group, for the motor to charge the first electric vehicle battery group and the second electric vehicle battery group.

4. The control method according to claim 1 , characterized in that

the controlling the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the first leg, and the second leg set to turn on or off, to form in a third period a circuit loop for the first electric vehicle battery group and the second electric vehicle battery group to discharge to the motor and to form in a fourth period a circuit loop for the first electric vehicle battery group, the second electric vehicle battery group, and the motor to discharge to the charge/discharge module comprises:

controlling, in the third period, the first switch, the second switch, the third switch, and the fourth switch to turn on, the fifth switch to turn off, the lower leg of the first leg and all the upper legs of the second leg set to turn on, and the upper leg of the first leg and all the lower legs of the second leg set to turn off, to form a circuit loop comprising the lower leg of the first leg, all the windings of the motor, all the upper legs of the second leg set, the first electric vehicle battery group, and the second electric vehicle battery group, for the first electric vehicle battery group and the second electric vehicle battery group to discharge to the motor; and

controlling, in the fourth period, the first switch, the second switch, the third switch, and the fourth switch to turn on, the fifth switch to turn off, the upper leg of the first leg and all the upper legs of the second leg set to turn on, and the lower leg of the first leg and all the lower legs of the second leg set to turn off, to form a circuit loop comprising the upper leg of the first leg, all the windings of the motor, all the upper legs of the second leg set, the first electric vehicle battery group, the second electric vehicle battery group, and the charge/discharge module, for the first electric vehicle battery group, the second electric vehicle battery group, and the motor to discharge to the charge/discharge module.

5. The control method according to claim 1 , characterized in that

the controlling the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the first leg, and the second leg set to turn on or off, to form in a third period a circuit loop for the first electric vehicle battery group and the second electric vehicle battery group to discharge to the motor and to form in the fourth period a circuit loop for the motor to discharge to the charge/discharge module comprises:

controlling, in the third period, the first switch, the second switch, the third switch, and the fourth switch to turn on, the fifth switch to turn off, the lower leg of the first leg and all the upper legs of the second leg set to turn on, and the upper leg of the first leg and all the lower legs of the second leg set to turn off, to form a circuit loop comprising the lower leg of the first leg, all the windings of the motor, all the upper legs of the second leg set, the first electric vehicle battery group, and the second electric vehicle battery group, for the first electric vehicle battery group and the second electric vehicle battery group to discharge to the motor; and

controlling, in the fourth period, the first switch, the second switch, the third switch, and the fourth switch to turn on, the fifth switch to turn off, the upper leg of the first leg and all the lower legs of the second leg set to turn on, and the lower leg of the first leg and all the upper legs of the second leg set to turn off, to form a circuit loop comprising the upper leg of the first leg, all the windings of the motor, all the lower legs of the second leg set, and the charge/discharge module, for the motor to discharge to the charge/discharge module.

6. The control method according to claim 1 , characterized in that the first period and the second period are alternately distributed, and/or the third period and the fourth period are alternately distributed.

7. The control method according to claim 1 , characterized in that currents flowing through all the windings of the motor have equal magnitudes and identical phases.

8. The control method according to claim 1 , characterized in that the motor is a three-phase motor.

9. A control apparatus for an electric vehicle battery voltage regulation system, characterized by comprising a processor, the processor being configured to perform the control method according to claim 1 .

10. An electric vehicle battery voltage regulation system characterized by comprising an electric vehicle battery, a motor, a bridge module, a switch assembly, and a control module; wherein

the electric vehicle battery comprises a first electric vehicle battery group and a second electric vehicle battery group;

the bridge module comprises a first leg and a second leg set, the first leg and all legs in the second leg set each comprise an upper leg and a lower leg, a joint between the upper leg and the lower leg of the first leg is connected to a joint of all windings of the motor, and joints between upper legs and lower legs of all the legs in the second leg set are connected to all the windings of the motor, respectively; and

the switch assembly comprises a first switch, a second switch, a third switch, a fourth switch, and a fifth switch, wherein one end of the first switch is connected to a positive terminal of a charge/discharge module, the other end of the first switch is connected to the upper leg of the first leg, one end of the second switch is connected to a joint of the upper legs of all the legs in the second leg set, the other end of the second switch is connected to a positive terminal of the first electric vehicle battery group, one end of the third switch is connected to the lower leg of the first leg, the other end of the third switch is connected to a negative terminal of the charge/discharge module, one end of the fourth switch is connected to a negative terminal of the first electric vehicle battery group, the other end of the fourth switch is connected to a positive terminal of the second electric vehicle battery group, one end of the fifth switch is connected to the negative terminal of the first electric vehicle battery group, and the other end of the fifth switch is connected to a joint of the lower legs of all the legs in the second leg set; and

the control module is configured to:

control the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the first leg, and the second leg set to turn on or off, to form in a first period a circuit loop for the charge/discharge module to discharge to the motor and to form in a second period a circuit loop for the charge/discharge module and the motor to charge the first electric vehicle battery group and the second electric vehicle battery group or form in the second period a circuit loop for the motor to charge the first electric vehicle battery group and the second electric vehicle battery group; or

control the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the first leg, and the second leg set to turn on or off, to form in a third period a circuit loop for the first electric vehicle battery group and the second electric vehicle battery group to discharge to the motor and to form in a fourth period a circuit loop for the first electric vehicle battery group, the second electric vehicle battery group, and the motor to discharge to the charge/discharge module or form in the fourth period a circuit loop for the motor to discharge to the charge/discharge module.

11. The electric vehicle battery voltage regulation system according to claim 10 , characterized in that

the control module is configured to:

control, in the first period, the first switch, the second switch, the third switch, and the fourth switch to turn on, the fifth switch to turn off, the upper leg of the first leg and all the lower legs of the second leg set to turn on, and the lower leg of the first leg and all the upper legs of the second leg set to turn off, to form a circuit loop comprising the upper leg of the first leg, all the windings of the motor, all the lower legs of the second leg set, and the charge/discharge module, for the charge/discharge module to discharge to the motor; and

control, in the second period, the first switch, the second switch, the third switch, and the fourth switch to turn on, the fifth switch to turn off, the upper leg of the first leg and all the upper legs of the second leg set to turn on, and the lower leg of the first leg and all the lower legs of the second leg set to turn off, to form a circuit loop comprising the upper leg of the first leg, all the windings of the motor, all the upper legs of the second leg set, the first electric vehicle battery group, the second electric vehicle battery group, and the charge/discharge module, for the charge/discharge module and the motor to charge the first electric vehicle battery group and the second electric vehicle battery group.

12. The electric vehicle battery voltage regulation system according to claim 10 , characterized in that

the control module is configured to:

control, in the first period, the first switch, the second switch, the third switch, and the fourth switch to turn on, the fifth switch to turn off, the upper leg of the first leg and all the lower legs of the second leg set to turn on, and the lower leg of the first leg and all the upper legs of the second leg set to turn off, to form a circuit loop comprising the upper leg of the first leg, all the windings of the motor, all the lower legs of the second leg set, and the charge/discharge module, for the charge/discharge module to discharge to the motor; and

control, in the second period, the first switch, the second switch, the third switch, and the fourth switch to turn on, the fifth switch to turn off, the lower leg of the first leg, and all the upper legs of the second leg set to turn on, and the upper leg of the first leg and all the lower legs of the second leg set to turn off, to form a circuit loop comprising the lower leg of the first leg, all the windings of the motor, all the upper legs of the second leg set, the first electric vehicle battery group, and the second electric vehicle battery group, for the motor to charge the first electric vehicle battery group and the second electric vehicle battery group.

13. The electric vehicle battery voltage regulation system according to claim 10 , characterized in that the control module is further configured to:

control, in the third period, the first switch, the second switch, the third switch, and the fourth switch to turn on, the fifth switch to turn off, the lower leg of the first leg and all the upper legs of the second leg set to turn on, and the upper leg of the first leg and all the lower legs of the second leg set to turn off, to form a circuit loop comprising the lower leg of the first leg, all the windings of the motor, all the upper legs of the second leg set, the first electric vehicle battery group, and the second electric vehicle battery group, for the first electric vehicle battery group and the second electric vehicle battery group to discharge to the motor; and

control, in the fourth period, the first switch, the second switch, the third switch, and the fourth switch to turn on, the fifth switch to turn off, the upper leg of the first leg and all the upper legs of the second leg set to turn on, and the lower leg of the first leg and all the lower legs of the second leg set to turn off, to form a circuit loop comprising the upper leg of the first leg, all the windings of the motor, all the upper legs of the second leg set, the first electric vehicle battery group, the second electric vehicle battery group, and the charge/discharge module, for the first electric vehicle battery group, the second electric vehicle battery group, and the motor to discharge to the charge/discharge module.

14. The electric vehicle battery voltage regulation system according to claim 10 , characterized in that the control module is further configured to:

control, in the third period, the first switch, the second switch, the third switch, and the fourth switch to turn on, the fifth switch to turn off, the lower leg of the first leg and all the upper legs of the second leg set to turn on, and the upper leg of the first leg and all the lower legs of the second leg set to turn off, to form a circuit loop comprising the lower leg of the first leg, all the windings of the motor, all the upper legs of the second leg set, the first electric vehicle battery group, and the second electric vehicle battery group, for the first electric vehicle battery group and the second electric vehicle battery group to discharge to the motor; and

control, in the fourth period, the first switch, the second switch, the third switch, and the fourth switch to turn on, the fifth switch to turn off, the upper leg of the first leg and all the lower legs of the second leg set to turn on, and the lower leg of the first leg and all the upper legs of the second leg set to turn off, to form a circuit loop comprising the upper leg of the first leg, all the windings of the motor, all the lower legs of the second leg set, and the charge/discharge module, for the motor to discharge to the charge/discharge module.

15. The electric vehicle battery voltage regulation system according to claim 10 , characterized in that the first period and the second period are alternately distributed, and/or the third period and the fourth period are alternately distributed.

16. The electric vehicle battery voltage regulation system according to claim 10 , characterized in that currents flowing through all the windings of the motor have equal magnitudes and identical phases.

17. The electric vehicle battery voltage regulation system according to claim 10 , characterized in that the motor is a three-phase motor.

18. A power apparatus characterized by comprising the electric vehicle battery voltage regulation system according to claim 10 , the electric vehicle battery voltage regulation system being configured to control charging or discharging of the electric vehicle battery, and the electric vehicle battery being configured to provide power to the power apparatus.