Control method and circuit, vehicle controller, electric vehicle

Abstract

A control circuit, comprising a first switch control unit (21), a second switch control unit (22), and an inductive device unit (23) arranged between the first switch control unit and the second switch control unit. A switching transistor of the first switch control unit and a switching transistor of the second switch control unit are alternately turned on and off according to a predetermined timing sequence, so as to perform self-heating of a battery (10) via charging and discharging of the inductive device unit. The control circuit enables self-heating of the battery via charging and discharging of the inductive device unit, thereby preventing the charging and discharging power of the battery from being affected in low-temperature environments. In addition, the invention further relates to a control method, a vehicle controller, and an electric vehicle.

Description

Control method and circuit, vehicle controller, and electric vehicle

[0001] This application claims priority to Chinese patent application No. 202410385848.4, filed on March 29, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present disclosure relates to the field of vehicle technology, and in particular to a control method and circuit, a vehicle controller, and an electric vehicle. Background Art

[0003] Most electric vehicles use lithium-ion batteries as their power supply. In low-temperature environments, lithium-ion batteries are highly polarized, affecting the battery's charge and discharge power. Summary of the Invention

[0004] The present disclosure provides a control method and circuit, a vehicle controller, and an electric vehicle. The control circuit can self-heat a battery, thereby preventing the battery's charging and discharging power from being affected in a low-temperature environment.

[0005] According to some embodiments of the present disclosure, a control circuit is provided, comprising: a first switch control unit, a second switch control unit; and an inductive device unit disposed between the first and second switch control units. The switching transistors of the first and second switch control units are alternately turned on and off according to a predetermined timing sequence, thereby self-heating the battery through the charging and discharging of the inductive device unit.

[0006] In some embodiments, the first switch control unit and the second switch control unit respectively include an upper bridge switch tube and a lower bridge switch tube, there is a first node between the upper bridge switch tube and the lower bridge switch tube of the first switch control unit, there is a second node between the upper bridge switch tube and the lower bridge switch tube of the second switch control unit, and the inductive device unit is connected between the first node and the second node.

[0007] In some embodiments, when the upper bridge switch tube of the first switch control unit is turned on, the lower bridge switch tube of the second switch control unit is turned on, and the lower bridge switch tube of the first switch control unit and the upper bridge switch tube of the second switch control unit remain turned off; when the lower bridge switch tube of the first switch control unit is turned on, the upper bridge switch tube of the second switch control unit is turned on, and the upper bridge switch tube of the first switch control unit and the lower bridge switch tube of the second switch control unit remain turned off.

[0008] In some embodiments, the inductive device unit includes a winding of a first motor, a winding of a second motor, and a first switch, wherein the first switch is connected between the neutral point of the winding of the first motor and the neutral point of the winding of the second motor, wherein when the first switch is closed, the winding of the first motor and the winding of the second motor are charged and discharged based on the alternating conduction and shutdown of the switching tube of the first switch control unit and the switching tube of the second switch control unit.

[0009] In some embodiments, the first switch control unit is a drive control circuit for the first motor, and the second switch control unit is a drive control circuit for the second motor.

[0010] In some embodiments, when at least one upper bridge switch tube of the drive control circuit of the first motor is turned on, at least one lower bridge switch tube of the drive control circuit of the second motor is turned on; when at least one lower bridge switch tube of the drive control circuit of the first motor is turned on, at least one upper bridge switch tube of the drive control circuit of the second motor is turned on.

[0011] In some embodiments, the control circuit further includes: a pre-charging unit, which is connected to the DC bus in series with the battery, so as to pre-charge the bus capacitor connected to the DC bus based on the power supply of the battery.

[0012] In some embodiments, the control circuit further includes: an external charging device and a boost unit, wherein the boost unit is adapted to boost the voltage output by the external charging device to charge the battery.

[0013] In some embodiments, the boost unit includes a boost inductor and a third switch control unit. One end of the boost inductor is adapted to be connected to the positive terminal of an external charging device. A third node is defined between an upper-bridge switch and a lower-bridge switch of the third switch control unit, and the third node is connected to the other end of the boost inductor. The upper-bridge switch and the lower-bridge switch of the third switch control unit are alternately turned on and off to boost the voltage output by the external charging device.

[0014] In some embodiments, the control circuit further includes a first charging switch and a second charging switch. The boost inductor is a winding of the third motor, the third switch control unit is a drive control circuit for the third motor, the neutral point of the winding of the third motor is connected to the positive terminal of the external charging device via the first charging switch, and the negative terminal of the drive control circuit of the third motor is connected to the negative terminal of the external charging device via the second charging switch. When the first and second charging switches are closed, the upper and lower bridge switches of the same bridge arm in the drive control circuit of the third motor are alternately turned on and off, so that the external charging device can boost and charge the battery.

[0015] In some embodiments, the control circuit further includes: a third charging switch, one end of the third charging switch is connected to the positive DC bus, and the other end of the third charging switch is suitable for connecting to the positive terminal of an external charging device; when the second charging switch and the third charging switch are closed, the external charging device directly charges the battery.

[0016] According to some embodiments of the present disclosure, a control method is provided, the method comprising: in response to a battery self-heating instruction, controlling a switch tube of a first switch control unit and a switch tube of a second switch control unit to be alternately turned on and off according to a predetermined timing, so as to self-heat the battery through charging and discharging of an inductive device unit, wherein the inductive device unit is arranged between the first switch control unit and the second switch control unit.

[0017] In some embodiments, controlling the switch tubes of the first switch control unit and the switch tubes of the second switch control unit to be alternately turned on and off according to a predetermined timing sequence includes: when the upper bridge switch tube of the first switch control unit is turned on, the lower bridge switch tube of the second switch control unit is turned on, and the lower bridge switch tube of the first switch control unit and the upper bridge switch tube of the second switch control unit remain turned off;

[0018] When the lower bridge switch of the first switch control unit is turned on, the upper bridge switch of the second switch control unit is turned on, and the upper bridge switch of the first switch control unit and the lower bridge switch of the second switch control unit remain turned off.

[0019] In some embodiments, controlling the switching tubes of the first switching control unit and the switching tubes of the second switching control unit to be alternately turned on and off according to a predetermined timing sequence includes: when at least one upper bridge switching tube of the driving control circuit of the first motor is turned on, at least one lower bridge switching tube of the driving control circuit of the second motor is turned on; when at least one lower bridge switching tube of the driving control circuit of the first motor is turned on, at least one upper bridge switching tube of the driving control circuit of the second motor is turned on;

[0020] The first switch control unit is a drive control circuit for the first motor, and the second switch control unit is a drive control circuit for the second motor.

[0021] In some embodiments, the method further includes: controlling the pre-charging unit in response to the pre-charging instruction so as to pre-charge the bus capacitor connected to the DC bus based on the power supply of the battery.

[0022] In some embodiments, the method further includes: in response to a boost charging instruction, controlling the boost unit to boost the voltage output by the external charging device to charge the battery.

[0023] In some embodiments, controlling the boost unit to boost the voltage output by the external charging device includes: controlling the upper bridge switch tube and the lower bridge switch tube of the third switch control unit of the boost unit to alternately turn on and off to boost the voltage output by the external charging device.

[0024] In some embodiments, controlling the upper bridge switch tube and the lower bridge switch tube of the third switch control unit in the boost unit to alternately turn on and off includes: controlling the first charging switch and the second charging switch to be closed; controlling the upper bridge switch tube and the lower bridge switch tube of the same bridge arm in the drive control circuit of the third motor to alternately turn on and off; the boost inductor of the boost unit is the winding of the third motor, and the third switch control unit is the drive control circuit of the third motor.

[0025] In some embodiments, the method further includes: in response to a direct charging instruction, controlling the second charging switch and the third charging switch to be closed so that the external charging device performs direct charging on the battery.

[0026] According to some embodiments of the present disclosure, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the above-mentioned control method is implemented.

[0027] According to some embodiments of the present disclosure, a vehicle controller is provided, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the above-mentioned control method is implemented.

[0028] According to some embodiments of the present disclosure, an electric vehicle is provided, comprising: the above-mentioned control circuit; or the above-mentioned vehicle controller.

[0029] In summary, some embodiments of the present disclosure provide a control method and circuit, a vehicle controller, and an electric vehicle. The control circuit may include a first switch control unit, a second switch control unit, and an inductive device unit disposed between the first and second switch control units. The switching transistors of the first and second switch control units are alternately turned on and off according to a predetermined timing sequence to self-heat the battery through the charging and discharging of the inductive device unit, thereby preventing the battery's charging and discharging power from being affected in low-temperature environments.

[0030] Additional aspects and advantages of the present disclosure will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] FIG1 is a schematic structural diagram of an electric vehicle according to some embodiments;

[0032] FIG2 is a schematic structural diagram of another electric vehicle according to some embodiments, wherein a control circuit is shown;

[0033] FIG3 is a schematic structural diagram of another electric vehicle according to some embodiments;

[0034] FIG4 is a schematic structural diagram of another electric vehicle according to some embodiments;

[0035] FIG5 is a schematic structural diagram of another electric vehicle according to some embodiments;

[0036] FIG6 is a schematic structural diagram of another electric vehicle according to some embodiments;

[0037] FIG7 is a schematic structural diagram of another electric vehicle according to some embodiments;

[0038] FIG8 is a schematic structural diagram of another electric vehicle according to some embodiments;

[0039] FIG9 is a schematic structural diagram of another electric vehicle according to some embodiments;

[0040] FIG10 is a schematic structural diagram of another electric vehicle according to some embodiments;

[0041] FIG11 is a schematic structural diagram of another electric vehicle according to some embodiments;

[0042] FIG12 is a schematic structural diagram of another electric vehicle according to some embodiments;

[0043] FIG13 is a schematic structural diagram of another electric vehicle according to some embodiments;

[0044] FIG14 is a schematic structural diagram of another electric vehicle according to some embodiments;

[0045] FIG15 is a schematic structural diagram of another electric vehicle according to some embodiments;

[0046] FIG16 is a schematic structural diagram of another electric vehicle according to some embodiments;

[0047] FIG17 is a schematic structural diagram of another electric vehicle according to some embodiments;

[0048] FIG18 is a flow chart of a control method according to some embodiments;

[0049] FIG19 is a flow chart of another control method according to some embodiments;

[0050] FIG20 is a schematic diagram of the structure of a vehicle controller according to some embodiments.

[0051] Reference numerals: electric vehicle 100, battery 10, control circuit 20, first switch control unit 21, second switch control unit 22, winding V1 of the first motor, winding V2 of the second motor, pre-charging unit 24, first switch K1, second switch K2, third switch K3, fourth switch K4, pre-charging resistor R, boost unit 25, boost inductor 251, third switch control unit 252, first charging switch S1, second charging switch S2, third charging switch S3, external charging device 200, first switch tube Q1, the second switching tube Q2, the third switching tube Q3, the fourth switching tube Q4, the fifth switching tube Q5, the sixth switching tube Q6, the seventh switching tube Q7, the eighth switching tube Q8, the ninth switching tube Q9, the tenth switching tube Q10, the eleventh switching tube Q11, the twelfth switching tube Q12, the thirteenth switching tube Q13, the fourteenth switching tube Q14, the fifteenth switching tube Q15, the sixteenth switching tube Q16, the seventeenth switching tube Q17, the eighteenth switching tube Q18, the first bus capacitor C1, the second bus capacitor C2, and the third bus capacitor C3. DETAILED DESCRIPTION

[0052] The following describes in detail embodiments of the present disclosure, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present disclosure, and should not be construed as limiting the present disclosure.

[0053] Most electric vehicles use lithium-ion batteries as their power source. However, lithium-ion batteries experience significant polarization in low-temperature environments, resulting in poor charge and discharge characteristics, which in turn affects the battery's charge and discharge power. To address the aforementioned issues, some embodiments of the present disclosure provide an electric vehicle. As shown in FIG1 , the electric vehicle 100 may include a battery 10, a control circuit 20, and a vehicle controller 30. In some embodiments, the control circuit 20 is connected to the battery 10 and the vehicle controller 30, respectively.

[0054] In some embodiments, the battery 10 may be a power battery. As shown in FIG2 , the control circuit 20 may include: a first switch control unit 21 and a second switch control unit 22 .

[0055] The control circuit 20 may further include an inductive device unit 23 disposed between the first switch control unit 21 and the second switch control unit 22 .

[0056] In some embodiments, the switch tubes of the first switch control unit 21 and the switch tubes of the second switch control unit 22 are alternately turned on and off according to a predetermined timing sequence to self-heat the battery 10 through the charging and discharging of the inductive device unit 23 .

[0057] As shown in FIG2 , a first end of the first switch control unit 21 is connected to the positive electrode of the battery 10 , a second end of the first switch control unit 21 is connected to the negative electrode of the battery 10 , and a third end of the first switch control unit 21 is connected to one end of the inductive device unit 23 .

[0058] A first end of the second switch control unit 22 is connected to the positive electrode of the battery 10 , a second end of the second switch control unit 22 is connected to the negative electrode of the battery 10 , and a third end of the second switch control unit 22 is connected to the other end of the inductive device unit 23 .

[0059] The first switch control unit 21 and the second switch control unit 22 may each be provided with at least one switch tube (not shown in FIG. 2 ).

[0060] The switches of the first switch control unit 21 and the second switch control unit 22 are alternately turned on and off according to a predetermined timing sequence to control the charging and discharging of the inductive device unit 23, thereby causing the current direction of the battery 10 to continuously change. Due to the internal resistance of the battery 10, the continuously alternating current direction of the battery 10 can cause the internal resistance of the battery 10 to generate a thermal effect, thereby causing the battery 10 to self-heat.

[0061] In summary, some embodiments of the present disclosure provide a control circuit that may include a first switch control unit, a second switch control unit, and an inductive device unit disposed between the first and second switch control units. The switching transistors of the first and second switch control units are alternately turned on and off according to a predetermined timing sequence to self-heat the battery through the charging and discharging of the inductive device unit, thereby preventing the battery's charging and discharging power from being affected in low-temperature environments.

[0062] In some embodiments of the present disclosure, the first switch control unit 21 and the second switch control unit 22 may respectively include an upper bridge switch tube and a lower bridge switch tube, there is a first node between the upper bridge switch tube and the lower bridge switch tube of the first switch control unit 21, there is a second node between the upper bridge switch tube and the lower bridge switch tube of the second switch control unit 22, and the inductive device unit 23 is connected between the first node and the second node.

[0063] In some embodiments, the first switch control unit 21 and the second switch control unit 22 may both be bridge circuits.

[0064] In some embodiments of the present disclosure, when the upper bridge switch of the first switch control unit 21 is turned on, the lower bridge switch of the second switch control unit 22 is turned on. At this time, the lower bridge switch of the first switch control unit 21 and the upper bridge switch of the second switch control unit 22 remain off. When the lower bridge switch of the first switch control unit 21 is turned on, the upper bridge switch of the second switch control unit 22 is turned on. At this time, the upper bridge switch of the first switch control unit 21 and the lower bridge switch of the second switch control unit 22 remain off. This cycle repeats, with the switches of the first switch control unit 21 and the second switch control unit 22 alternately turned on and off.

[0065] In some embodiments, each of the first switch control unit 21 and the second switch control unit 22 may include one or more upper-bridge switch tubes and one or more lower-bridge switch tubes.

[0066] When the first switch control unit 21 and the second switch control unit 22 each include an upper bridge switch tube and a lower bridge switch tube, when an upper bridge switch tube of the first switch control unit 21 is turned on and a lower bridge switch tube of the second switch control unit 22 is turned on, a lower bridge switch tube of the first switch control unit 21 and an upper bridge switch tube of the second switch control unit 22 remain turned off.

[0067] When a lower bridge switch tube of the first switch control unit 21 is turned on and an upper bridge switch tube of the second switch control unit 22 is turned on, an upper bridge switch tube of the first switch control unit 21 and a lower bridge switch tube of the second switch control unit 22 remain turned off.

[0068] In the case where both the first switch control unit 21 and the second switch control unit 22 include multiple upper bridge switch tubes and multiple lower bridge switch tubes, when at least one upper bridge switch tube of the first switch control unit 21 is turned on and at least one lower bridge switch tube of the second switch control unit 22 is turned on, the multiple lower bridge switch tubes of the first switch control unit 21 and the multiple upper bridge switch tubes of the second switch control unit 22 are all kept off.

[0069] When at least one lower bridge switch tube of the first switch control unit 21 is turned on and at least one upper bridge switch tube of the second switch control unit 22 is turned on, all the upper bridge switch tubes of the first switch control unit 21 and the lower bridge switch tubes of the second switch control unit 22 remain turned off.

[0070] When both the first switch control unit 21 and the second switch control unit 22 are three-phase bridge circuits, referring to FIG3 , the first switch control unit 21 may include a first three-phase bridge arm and first to sixth switch transistors Q1 to Q6. Here, the first to sixth switch transistors Q1 to Q6 may each be an insulated gate bipolar transistor (IGBT). For example, the first to sixth switch transistors Q1 to Q6 include a first switch transistor Q1, a second switch transistor Q2, a third switch transistor Q3, a fourth switch transistor Q4, a fifth switch transistor Q5, and a sixth switch transistor Q6.

[0071] The first end of the first three-phase bridge arm (i.e., the first end of the first switch control unit 21) is connected to the positive electrode of the battery 10, the second end of the first three-phase bridge arm (i.e., the second end of the first switch control unit 21) is connected to the negative electrode of the battery 10, and the third end of the first three-phase bridge arm (i.e., the third end of the first switch control unit 21) is connected to one end of the inductive device unit 23 through the first node n1 on the first three-phase bridge arm.

[0072] The first three-phase bridge arm may include a first phase bridge arm, a second phase bridge arm and a third phase bridge arm. The upper bridge switch tube on the first phase bridge arm in the first three-phase bridge arm is the first switch tube Q1, the lower bridge switch tube is the fourth switch tube Q4, and there is a first node n1 between the first switch tube Q1 and the fourth switch tube Q4.

[0073] The upper bridge switch on the second phase bridge arm in the first three-phase bridge arm is the second switch Q2 , the lower bridge switch is the fifth switch Q5 , and a first node n1 is defined between the second switch Q2 and the fifth switch Q5 .

[0074] The upper bridge switch on the third phase bridge arm in the first three-phase bridge arm is the third switch Q3 , the lower bridge switch is the sixth switch Q6 , and a first node n1 is defined between the third switch Q3 and the sixth switch Q6 .

[0075] The second switch control unit 22 may include a second three-phase bridge arm and seventh to twelfth switching transistors Q7 to Q12. Here, the seventh to twelfth switching transistors Q7 to Q12 may all be IGBTs. For example, the seventh to twelfth switching transistors Q7 to Q12 include a seventh switching transistor Q7, an eighth switching transistor Q8, a ninth switching transistor Q9, a tenth switching transistor Q10, an eleventh switching transistor Q11, and a twelfth switching transistor Q12.

[0076] The first end of the second three-phase bridge arm (i.e., the first end of the second switch control unit 22) is connected to the positive electrode of the battery 10, the second end of the second three-phase bridge arm (i.e., the second end of the second switch control unit 22) is connected to the negative electrode of the battery 10, and the third end of the second three-phase bridge arm (i.e., the third end of the second switch control unit 22) is connected to the other end of the inductive device unit 23 through the second node n2.

[0077] The second three-phase bridge arm may include a first phase bridge arm, a second phase bridge arm and a third phase bridge arm. The upper bridge switch tube on the first phase bridge arm in the second three-phase bridge arm is the seventh switch tube Q7, the lower bridge switch tube is the tenth switch tube Q10, and a second node n2 is set between the seventh switch tube Q7 and the tenth switch tube Q10.

[0078] The upper bridge switch on the second phase bridge arm of the second three-phase bridge arm is the eighth switch Q8 , the lower bridge switch is the eleventh switch Q11 , and a second node n2 is provided between the eighth switch Q8 and the eleventh switch Q11 .

[0079] The upper bridge switch on the third phase bridge arm in the second three-phase bridge arm is the ninth switch Q9 , the lower bridge switch is the twelfth switch Q12 , and a second node n2 is provided between the ninth switch Q9 and the twelfth switch Q12 .

[0080] In some embodiments of the present disclosure, referring to FIG4 , the inductive device unit 23 includes a winding V1 of a first motor, a first switch K1 and a winding V2 of a second motor, and the first switch K1 is connected between the neutral point of the winding of the first motor and the neutral point of the winding of the second motor.

[0081] In some embodiments, when the first switch K1 is closed, the winding V1 of the first motor and the winding V2 of the second motor are charged and discharged based on the alternating on and off of the switches of the first switch control unit 21 and the second switch control unit 22 .

[0082] In some embodiments, the first switch control unit 21 may be a drive control circuit for the first motor, and the second switch control unit 22 may be a drive control circuit for the second motor.

[0083] The drive control circuit for the first motor and the drive control circuit for the second motor can both be three-phase bridge circuits. When at least one upper-bridge switch in the drive control circuit for the first motor is turned on, at least one lower-bridge switch in the drive control circuit for the second motor is turned on. When at least one lower-bridge switch in the drive control circuit for the first motor is turned on, at least one upper-bridge switch in the drive control circuit for the second motor is turned on.

[0084] In some embodiments, when at least one upper bridge switch tube of the drive control circuit of the first motor is turned on and at least one lower bridge switch tube of the drive control circuit of the second motor is turned on, multiple lower bridge switch tubes of the drive control circuit of the first motor and multiple upper bridge switch tubes of the drive control circuit of the second motor are all turned off.

[0085] When at least one lower bridge switch tube of the drive control circuit of the first motor is turned on and at least one upper bridge switch tube of the drive control circuit of the second motor is turned on, multiple upper bridge switch tubes of the drive control circuit of the first motor and multiple lower bridge switch tubes of the drive control circuit of the second motor are all turned off.

[0086] In some embodiments of the present disclosure, when the drive control circuit of the first motor and the drive control circuit of the second motor are both three-phase bridge circuits, referring to Figure 4, in the first time period, the upper bridge switch tubes (i.e., the first switch tube Q1 to the third switch tube Q3) of the drive control circuit of the first motor and the lower bridge switch tubes (i.e., the tenth switch tube Q10 to the twelfth switch tube Q12) of the drive control circuit of the second motor are all turned on, and the lower bridge switch tubes (i.e., the fourth switch tube Q4 to the sixth switch tube Q6) of the drive control circuit of the first motor and the upper bridge switch tubes (i.e., the seventh switch tube Q7 to the ninth switch tube Q9) of the drive control circuit of the second motor remain all turned off.

[0087] In the second time period, the lower bridge switches (i.e., the fourth to sixth switches Q4 to Q6) of the drive control circuit of the first motor and the upper bridge switches (i.e., the seventh to ninth switches Q9) of the drive control circuit of the second motor are all turned on, and the upper bridge switches (i.e., the first to third switches Q1 to Q3) of the drive control circuit of the first motor and the lower bridge switches (i.e., the tenth to twelfth switches Q12) of the drive control circuit of the second motor remain all turned off.

[0088] Here, the first time period and the second time period are performed alternately. The predetermined time sequence may include at least one alternating first time period and second time period.

[0089] During the first time period, referring to Figure 5 , current flows from the positive electrode of the battery 10, through the first and third switching transistors Q1 and Q3, the winding V1 of the first motor, the first switch K1, the winding V2 of the second motor, and the tenth and twelfth switching transistors Q10 and Q12, ultimately returning to the negative electrode of the battery 10. During this process, energy from the battery 10 is transferred to the windings V1 and V2 of the first and second motors. Because both the windings V1 and V2 of the first and second motors can store the received energy, the windings V1 and V2 of the first and second motors are charged. Current flows from the positive electrode of the battery 10 to the negative electrode of the battery 10, and this current direction can be seen in the X direction as shown in Figure 5 .

[0090] During the second time period, referring to Figure 6 , since the currents in winding V1 of the first motor and winding V2 of the second motor cannot change suddenly, winding V1 of the first motor and winding V2 of the second motor begin to discharge. The currents in winding V1 of the first motor and winding V2 of the second motor continue to flow through the fourth to sixth switching transistors Q4 to Q6, and the seventh to ninth switching transistors Q7 to Q9. The current begins at the negative electrode of battery 10, flows sequentially through the fourth to sixth switching transistors Q4 to Q6, winding V1 of the first motor, the first switch K1, winding V2 of the second motor, and the seventh to ninth switching transistors Q7 to Q9, ultimately returning to the positive electrode of battery 10. This releases the energy stored in winding V1 of the first motor and winding V2 of the second motor during the first time period back to battery 10, with current flowing from the negative electrode of battery 10 to the positive electrode of battery 10, in the direction Y shown in Figure 6 .

[0091] The alternating cycles of the first and second time periods achieve alternating charge and discharge cycles of the inductive device unit 23, thereby continuously alternating the direction of the current in the battery 10. Due to the internal resistance of the battery 10, the continuously alternating direction of the current in the battery 10 causes the internal resistance of the battery 10 to generate a thermal effect, thereby achieving self-heating of the battery 10.

[0092] When the first switch control unit 21 is the drive control circuit of the first motor and the second switch control unit 22 is the drive control circuit of the second motor, the control circuit in some embodiments of the present disclosure fully utilizes the topological advantages of the multi-motor circuit, and connects the neutral point of the winding of the first motor and the neutral point of the winding of the second motor through the first switch K1 for self-heating of the battery 10.

[0093] Compared to the single-motor circuits of the related art, in which the battery neutral line and the motor winding neutral point are connected via a switch to achieve battery self-heating, the control circuit in some embodiments of the present disclosure connects a first switch K1 between the winding neutral point of the first motor and the winding neutral point of the second motor to achieve self-heating of the battery 10. Because the wiring harness connecting the winding V1 of the first motor and the winding V2 of the second motor is shorter than the wiring harness connecting the battery neutral line and the motor winding neutral point, the length of the wiring harness used for connection is significantly reduced without the need for an additional switch, thereby reducing the cost of achieving self-heating of the battery 10. Furthermore, based on the existing multi-motor circuit, the changes to the existing multi-motor circuit are relatively minor, the hardware cost is low, and the actual implementation cost is low, which can fully utilize the advantages of multi-motor vehicles.

[0094] Moreover, compared with the single motor circuit of the related art which requires four time periods to realize self-heating of the battery, referring to FIG4 , the control circuit in some embodiments of the present disclosure has a simpler control logic for realizing self-heating of the battery 10, and only requires two time periods (i.e., the first time period and the second time period) to implement on-off control of the first switch tube Q1 to the twelfth switch tube Q12 to realize self-heating of the battery 10.

[0095] In some embodiments of the present disclosure, referring to FIG7 , the control circuit 20 may further include a pre-charging unit 24 , which is connected in series with the battery 10 and then connected to the DC bus, so as to pre-charge the bus capacitor connected to the DC bus based on the power supply of the battery 10 .

[0096] In some embodiments, the pre-charging unit 24 may include a pre-charging resistor R and a second switch K2 connected in series. Here, the second switch K2 may be a contactor.

[0097] The control circuit 20 may also include a bus capacitor, one end of which is connected to the positive DC bus, and the other end of which is connected to the negative DC bus. In the process of precharging the bus capacitor, the second switch K2 is in a closed state, and the current provided by the battery 10 starts from the positive electrode of the battery 10, passes through the precharging unit 24 and the bus capacitor in sequence, and finally returns to the negative electrode of the battery 10, thereby realizing precharging of the bus capacitor connected to the DC bus based on the power supply of the battery 10. By setting a precharging resistor R in the precharging unit 24, it is possible to effectively avoid the occurrence of overcurrent caused by excessive current in the precharging circuit at the moment when the precharging unit 24 is turned on.

[0098] In some embodiments, the bus capacitor may be one or more. Taking multiple bus capacitors as an example, referring to Figure 7, the bus capacitor may include a first bus capacitor C1 and a second bus capacitor C2, and the first bus capacitor C1 and the second bus capacitor C2 are both connected in parallel with the battery 10.

[0099] Referring to Figure 8 , when the second switch K2 is closed, current flows from the positive electrode of the battery 10, passes through the pre-charging unit 24 and the first bus capacitor C1, and ultimately returns to the negative electrode of the battery 10. Simultaneously, current flows through the pre-charging unit 24 and the second bus capacitor C2, ultimately returning to the negative electrode of the battery 10. This allows the first bus capacitor C1 and the second bus capacitor C2 connected to the DC bus to be pre-charged based on the power supplied by the battery 10. The current direction can be the X direction in Figure 8 .

[0100] It should be noted that precharging the busbar capacitors is performed before heating the battery 10. During the precharging process, the switches of the first motor drive control circuit and the second motor drive control circuit are all turned off. During the self-heating process of the battery 10, the precharging switch K2 can be turned on or off.

[0101] In some embodiments of the present disclosure, referring to FIG7 , the positive electrode of the battery 10 is connected to the positive DC bus via a third switch K3, the negative electrode of the battery 10 is connected to the negative DC bus via a fourth switch K4, and the pre-charge unit 24 is connected in parallel with the third switch K3. Here, both the third switch K3 and the fourth switch K4 may be contactors.

[0102] During precharging of the bus capacitor, the second switch K2 and the fourth switch K4 are both closed, and the third switch K3 is open, thereby precharging the bus capacitor connected to the DC bus using power supplied by the battery 10. After precharging of the bus capacitor is complete, the third switch K3 is closed, and the battery 10 is directly connected to the bus capacitor.

[0103] In some embodiments of the present disclosure, referring to FIG. 9 , the control circuit 20 may further include a boost unit 25 , which is adapted to boost the voltage output by the external charging device 200 to charge the battery 10 .

[0104] The first end of the boost unit 25 is connected to the positive terminal of the external charging device 200 , the second end of the boost unit 25 is connected to the negative terminal of the battery 10 and the negative terminal of the external charging device 200 respectively, and the third end of the boost unit 25 is connected to the positive terminal of the battery 10 .

[0105] It is understandable that when the voltage output by the external charging device 200 is lower than the voltage required by the battery 10, the voltage output by the external charging device 200 is boosted by the boost unit 25 so that the voltage output by the external charging device 200 matches the voltage required by the battery 10, thereby enabling the external charging device 200 to charge the battery 10.

[0106] 10 , the boost unit 25 may include a boost inductor 251 , one end of the boost inductor 251 (ie, a first end of the boost unit 25 ) being adapted to be connected to a positive terminal of an external charging device 200 .

[0107] The boost unit 25 may further include a third switch control unit 252 , wherein a third node (not shown in FIG10 ) is provided between the upper bridge switch tube and the lower bridge switch tube of the third switch control unit 252 , and the third node is connected to the other end of the boost inductor 251 .

[0108] Here, the upper bridge switch and the lower bridge switch of the third switch control unit 252 are alternately turned on and off to boost the voltage output by the external charging device 200 .

[0109] 10 , the negative terminal of the third switch control unit 252 (i.e., the second terminal of the boost unit 25) is connected to the negative electrode of the battery 10 and the negative electrode of the external charging device 200, respectively, and the positive terminal of the third switch control unit 252 (i.e., the third terminal of the boost unit 25) is connected to the positive electrode of the battery 10.

[0110] In some embodiments, the third switch control unit 252 may be a bridge circuit, and the third switch control unit 252 may include at least one upper bridge switch tube and at least one lower bridge switch tube.

[0111] In some embodiments of the present disclosure, the upper bridge switch of the third switch control unit is turned on so that the external charging device 200 can directly charge the battery 10 .

[0112] In some embodiments of the present disclosure, referring to Figure 11 , the boost inductor 251 may be the winding of a third motor, and the third switch control unit 252 may be the drive control circuit for the third motor. The control circuit 20 may further include a first charging switch S1 and a second charging switch S2, each of which may be a contactor. The neutral point of the winding of the third motor is connected to the positive terminal of the external charging device 200 via the first charging switch S1, and the negative terminal of the drive control circuit of the third motor is connected to the negative terminal of the external charging device 200 via the second charging switch S2.

[0113] In some embodiments, when the first charging switch S1 and the second charging switch S2 are closed, the upper bridge switch tube and the lower bridge switch tube of the same bridge arm in the drive control circuit of the third motor are alternately turned on and off, so that the external charging device 200 can boost and charge the battery 10.

[0114] The alternating on and off of the upper and lower switches in the same bridge arm means that the upper and lower switches in the same bridge arm are in different states. That is, when the upper switch is on, the lower switch is off, and when the upper switch is off, the lower switch is on.

[0115] In some embodiments of the present disclosure, when the first charging switch S1 and the second charging switch S2 are closed, at least one upper bridge switch tube of the drive control circuit of the third motor is turned on, so that the external charging device 200 can directly charge the battery 10.

[0116] In some embodiments of the present disclosure, the drive control circuit of the third motor may be a three-phase bridge circuit. Referring to FIG11 , when the external charging device 200 performs boost charging on the battery 10, the upper bridge switch tube and the lower bridge switch tube of at least one phase bridge arm in the drive control circuit of the third motor are alternately turned on and off.

[0117] In some embodiments, during the process of alternating on and off of the upper and lower bridge switches of at least one phase bridge arm, when the upper bridge switch of at least one phase bridge arm is turned on, the lower bridge switch of the bridge arm where the upper bridge switch is turned on is turned off. When the lower bridge switch of at least one phase bridge arm is turned on, the upper bridge switch of the bridge arm where the lower bridge switch is turned on is turned off.

[0118] 11 , when the external charging device 200 is directly charging the battery 10 , all the upper-bridge switches of the third switch control unit are turned on, and all the lower-bridge switches are turned off.

[0119] When the external charging device 200 performs boost charging on the battery 10, the first charging switch S1 and the second charging switch S2 are both closed, and when the upper bridge switch tube of at least one phase bridge arm in the drive control circuit of the third motor is turned on, the lower bridge switch tube on the bridge arm where the upper bridge switch tube is turned on is turned off; when the lower bridge switch tube on at least one phase bridge arm in the drive control circuit of the third motor is turned on, all the upper bridge switch tubes of the bridge arm where the lower bridge switch tube is turned on are turned off.

[0120] When the upper bridge switch tube of at least one phase bridge arm in the drive control circuit of the third motor is turned on and all the lower bridge switch tubes on the bridge arm where the turned-on upper bridge switch tube is located are turned off, the current can flow from the positive terminal of the external charging device 200, through the winding of the third motor, the upper bridge switch tube of at least one phase bridge arm in the drive control circuit of the third motor, and the battery 10, and finally return to the negative terminal of the external charging device 200.

[0121] When the lower bridge switch of at least one phase arm in the drive control circuit of the third motor is turned on, and all the upper bridge switches in the arm where the lower bridge switch is turned on are turned off, current can flow from the positive terminal of the external charging device 200, through the winding of the third motor, the lower bridge switch of at least one phase arm in the drive control circuit of the third motor, and the battery 10, and finally return to the negative terminal of the external charging device 200. This alternating process enables the external charging device 200 to boost and charge the battery 10.

[0122] When the first charging switch S1 and the second charging switch S2 are closed, the upper bridge switch tubes of the drive control circuit of the third motor are all turned on, and the lower bridge switch tubes are all turned off. At this time, the current can flow from the positive terminal of the external charging device 200, through the winding of the third motor, the upper bridge switch tube that is turned on in the drive control circuit of the third motor, and the battery 10, and finally return to the negative terminal of the external charging device 200, so that the external charging device 200 can directly charge the battery 10.

[0123] Referring to FIG11 , the drive control circuit for the third motor may include a third three-phase bridge arm and thirteenth to eighteenth switching transistors Q13 to Q18. Here, the thirteenth to eighteenth switching transistors Q13 to Q18 may be IGBTs. For example, the thirteenth to eighteenth switching transistors Q13 to Q18 include a thirteenth switching transistor Q13, a fourteenth switching transistor Q14, a fifteenth switching transistor Q15, a sixteenth switching transistor Q16, a seventeenth switching transistor Q17, and an eighteenth switching transistor Q18.

[0124] The positive terminal of the third three-phase bridge arm is connected to the positive DC bus, the negative terminal of the third three-phase bridge arm is connected to the negative DC bus, and the third node n3 on the third three-phase bridge arm is connected to one end of the winding of the third motor.

[0125] The third three-phase bridge leg may include a first phase bridge leg, a second phase bridge leg, and a third phase bridge leg. The upper bridge switch on the first phase bridge leg of the third three-phase bridge leg is the thirteenth switch Q13, and the lower bridge switch is the sixteenth switch Q16. A third node n3 is defined between the thirteenth switch Q13 and the sixteenth switch Q16. The upper bridge switch on the second phase bridge leg of the third three-phase bridge leg is the fourteenth switch Q14, and the lower bridge switch is the seventeenth switch Q17. The fourteenth switch Q14 and the seventeenth switch Q17 define a third node n3. The upper bridge switch on the third phase bridge leg of the third three-phase bridge leg is the fifteenth switch Q15, and the lower bridge switch is the eighteenth switch Q18. A third node n3 is defined between the fifteenth switch Q15 and the eighteenth switch Q18.

[0126] When the external charging device 200 performs boost charging on the battery 10, if at least one phase bridge arm includes the first phase bridge arm in the drive control circuit of the third motor, then when the first charging switch S1 and the second charging switch S2 are closed, the thirteenth switch tube Q13 and the sixteenth switch tube Q16 are alternately turned on and off.

[0127] In some embodiments, when the sixteenth switch tube Q16 is turned on and the thirteenth switch tube Q13 is turned off, the current starts from the positive terminal of the external charging device 200, passes through the winding of the third motor, the sixteenth switch tube Q16, and finally returns to the negative terminal of the external charging device 200, thereby realizing energy transfer from the external charging device 200 to the winding of the third motor, thereby charging the winding of the third motor.

[0128] When the thirteenth switch tube Q13 is turned on and the sixteenth switch tube Q16 is turned off, the current continues to flow through the thirteenth switch tube Q13. The current can start from the positive terminal of the external charging device 200, flow through the winding of the third motor, the thirteenth switch tube Q13 and the battery 10 in sequence, and finally return to the negative terminal of the external charging device 200, so that the external charging device 200 can boost and charge the battery 10.

[0129] Referring to Figure 12, if at least one phase bridge arm includes the first phase bridge arm, the second phase bridge arm and the third phase bridge arm of the drive control circuit of the third motor, then when the first charging switch S1 and the second charging switch S2 are closed, the thirteenth switching tube Q13 to the fifteenth switching tube Q15 and the sixteenth switching tube Q16 to the eighteenth switching tube Q18 are alternately turned on and off.

[0130] Referring to Figure 12, when the sixteenth to eighteenth switching tubes Q16 to Q18 are turned on, the thirteenth to fifteenth switching tubes Q13 to Q15 are all turned off. At this time, the current starts from the positive terminal of the external charging device 200, flows through the first charging switch S1, the winding of the third motor (i.e., the boost inductor 251), the sixteenth to eighteenth switching tubes Q16 to Q18, and finally returns to the negative terminal of the external charging device 200, thereby realizing energy transfer from the external charging device 200 to the winding of the third motor, thereby charging the winding of the third motor.

[0131] Then, referring to FIG13 , when the thirteenth to fifteenth switching transistors Q13 to Q15 are turned on and the sixteenth to eighteenth switching transistors Q16 to Q18 are all turned off, current continues to flow through the thirteenth to fifteenth switching transistors Q13 to Q15. The current starts from the positive terminal of the external charging device 200, flows through the first charging switch S1, the winding of the third motor (i.e., the boost inductor 251), the thirteenth to fifteenth switching transistors Q13 to Q15, the third switch K3, the battery 10, and the fourth switch K4, and finally returns to the negative terminal of the external charging device 200, thereby enabling the external charging device 200 to boost and charge the battery 10. This reciprocating process allows the external charging device 200 to boost and charge the battery 10.

[0132] In some embodiments of the present disclosure, during the process of boost charging of the battery 10 by the external charging device 200, the control circuit 20 can operate in a forced continuous conduction mode (FCCM). The output voltage of the DC power output by the external charging device 200 through the entire control circuit 20 can be adjusted by the conduction duty cycle of the lower bridge switch tube of the drive control circuit of the third motor, thereby achieving the boost requirements for different battery 10 charging processes.

[0133] When the boost inductor 251 is the winding of the third motor and the third switch control unit 252 is the drive control circuit of the third motor, the control circuit in some embodiments of the present disclosure fully utilizes the topological advantages of the multi-motor circuit, utilizes the implementation ideas of the original multi-motor circuit, and realizes boost charging without adding additional devices, with little change to the original multi-motor circuit.

[0134] In addition, the drive control circuit of the motor used to realize self-heating of the battery 10 (i.e., the drive control circuit of the first motor and the drive control circuit of the second motor) is separated from the drive control circuit of the motor used to realize boost charging of the battery 10 (i.e., the drive control circuit of the third motor). The self-heating of the battery 10 and the boost charging of the battery 10 are respectively realized through the drive control circuits of different motors, thereby realizing the decoupling of the self-heating function and the boost charging function. While reducing the complexity of the drive control circuit function of a single motor, it also improves the fault tolerance of the control circuit 20 in the event of a fault, makes full use of the existing motor electronic control, balances the utilization rate of each component, and ensures the reliability of the component for a longer period of time.

[0135] When the external charging device 200 is directly charging the battery 10, referring to FIG13 , when the first charging switch S1 and the second charging switch S2 are closed, the upper bridge switches (i.e., the thirteenth to fifteenth switches Q13 to Q15) of the drive control circuit of the third motor are all turned on, and the lower bridge switches (i.e., the sixteenth to eighteenth switches Q16 to Q18) are all turned off. At this time, current flows from the positive terminal of the external charging device 200, through the winding of the third motor, the first charging switch S1, the thirteenth to fifteenth switches Q13 to Q15, the third switch K3, the battery 10, the fourth switch K4, and the second charging switch S2, and finally returns to the negative terminal of the external charging device 200, thereby enabling the external charging device 200 to directly charge the battery 10.

[0136] It should be noted that, when the battery 10 is directly charged by the external charging device 200 , the third switch K3 and the fourth switch K4 remain in the closed state.

[0137] In some embodiments of the present disclosure, referring to FIG. 14 , the third terminal of the boost unit 25 is further connected to the positive terminal of the external charging device 200 .

[0138] In some embodiments, referring to FIG. 15 , the positive terminal of the third switch control unit 252 is also connected to the positive terminal of the external charging device 200 .

[0139] The boost inductor 251 can be the winding of the third motor, and the third switch control unit 252 is the drive control circuit for the third motor. Referring to Figure 16 , the control circuit 20 can also include a third charging switch S3 , one end of which is connected to the positive DC bus, and the other end of which is suitable for connecting to the positive terminal of the external charging device 200 .

[0140] In some embodiments, when the second charging switch S2 and the third charging switch S3 are closed, the external charging device 200 directly charges the battery 10. The third charging switch S3 may be a contactor.

[0141] Referring to Figure 17, when the second charging switch S2 and the third charging switch S3 are closed, the current flows from the positive terminal of the external charging device 200, through the third charging switch S3, the first switch K3, the battery 10, the fourth switch S4 and the second charging switch S2, and finally returns to the negative terminal of the external charging device 200, so that the external charging device 200 can directly charge the battery 10.

[0142] The external charging device 200 is directly connected to the battery 10 through the third charging switch S3. When the external charging device 200 directly charges the battery 10, the electric energy provided by the external charging device 200 is directly transmitted to the battery 10 through the DC bus without passing through the windings of the third motor and the drive control circuit of the third motor. This avoids the loss of electric energy in the windings of the third motor and the drive control circuit of the third motor and improves the efficiency of battery charging.

[0143] In some embodiments of the present disclosure, referring to FIG16 , the bus capacitor may further include a third bus capacitor C3, which is connected in parallel with the battery 10. During the precharging process of the bus capacitor, the third bus capacitor C3 may also be precharged. The current may start from the positive electrode of the battery 10, flow through the precharging unit 24 and the third bus capacitor C3 in sequence, and finally return to the negative electrode of the battery 10, thereby precharging the third bus capacitor C3 connected to the DC bus based on the power supply of the battery 10.

[0144] In some embodiments of the present disclosure, where the boost inductor is the winding of a third motor and the third switch control unit is the drive control circuit for the third motor, the control circuit fully utilizes the topological advantages of the multi-motor circuit, connecting the neutral point of the winding of the third motor to the external charging device via the first charging switch for direct charging or boost charging of the battery. Because the distance between the winding of the third motor and the external charging device is relatively short, the wiring harness connecting the winding of the third motor and the external charging device is relatively short. Therefore, only a shorter wiring harness is required to be added to the existing multi-motor circuit, resulting in minimal changes to the existing multi-motor circuit and low hardware cost.

[0145] Moreover, when the first switch control unit is the drive control circuit of the first motor and the second switch control unit is the drive control circuit of the second motor, the process of self-heating the battery and the process of direct charging or boost charging of the battery can be separated, thereby being better adapted to the situation of multiple motors.

[0146] In summary, some embodiments of the present disclosure provide a control circuit that may include a first switch control unit, a second switch control unit, and an inductive device unit disposed between the first and second switch control units. In some embodiments, the switches of the first and second switch control units are alternately turned on and off according to a predetermined timing sequence to self-heat the battery through the charging and discharging of the inductive device unit, thereby preventing the battery's charging and discharging power from being affected in low-temperature environments.

[0147] FIG18 is a flow chart of a control method according to some embodiments, which may be applied to the electric vehicle shown in FIG1 to FIG17. Referring to FIG18, the method includes:

[0148] Step 1801: In response to a battery self-heating instruction, control the switch tubes of the first switch control unit and the switch tubes of the second switch control unit to be alternately turned on and off according to a predetermined timing sequence, so as to self-heat the battery through charging and discharging of the inductive device unit.

[0149] In response to a battery self-heating instruction, the vehicle controller can control the switches of the first and second switch control units to alternately turn on and off according to a predetermined timing sequence, thereby self-heating the battery through the charging and discharging of the inductive device unit 23. Here, the inductive device unit is arranged between the first and second switch control units.

[0150] In summary, some embodiments of the present disclosure provide a control method, in which a vehicle controller can control the switch tube of the first switch control unit and the switch tube of the second switch control unit to alternately turn on and off according to a predetermined timing in response to a battery self-heating instruction, so as to self-heat the battery through the charging and discharging of the inductive device unit, thereby avoiding affecting the charging and discharging power of the battery in a low temperature environment.

[0151] FIG19 is a flow chart of another control method according to some embodiments, which may be applied to the electric vehicle shown in FIG1 to FIG17. Referring to FIG19, the method may include:

[0152] Step 1901: In response to a pre-charging instruction, control a pre-charging unit to pre-charge a bus capacitor connected to a DC bus based on power supply from a battery.

[0153] The vehicle controller may control the pre-charging unit in response to the pre-charging instruction so as to pre-charge the bus capacitor connected to the DC bus based on the power supply of the battery.

[0154] In some embodiments, referring to Figure 8, the vehicle controller can control the fourth switch K4 to close and the second switch K2 of the pre-charging unit 24 to close in response to the pre-charging instruction, so that the pre-charging unit 24 pre-charges the bus capacitors (i.e., the first bus capacitor C1 and the second bus capacitor C2) connected to the DC bus based on the power supply of the battery 10.

[0155] In some embodiments, the vehicle controller controls the second switch K2 and the fourth switch K4 to be closed, so that the pre-charging unit 24 is connected to the bus capacitance of the DC bus based on the power supply of the battery 10 .

[0156] After the capacitor pre-charging is completed, the vehicle controller can control the third switch K3 to be closed, and the pre-charging unit 24 battery 10 is directly connected to the bus capacitor, and the capacitor pre-charging is completed.

[0157] After the vehicle controller controls the capacitor pre-charging to end, the third switch K3 and the fourth switch K4 remain in the closed state.

[0158] Step 1902: In response to the battery self-heating instruction, control the switch tube of the first switch control unit and the switch tube of the second switch control unit to be alternately turned on and off according to a predetermined timing sequence.

[0159] The vehicle controller controls the pre-charging unit in response to the pre-charging instruction so that after pre-charging the bus capacitor connected to the DC bus based on the power supply of the battery, it can respond to the battery self-heating instruction to control the switching tube of the first switching control unit and the switching tube of the second switching control unit to be alternately turned on and off according to a predetermined timing, so as to self-heat the battery through the charging and discharging of the inductive device unit.

[0160] The vehicle controller can control the lower bridge switch tube of the second switch control unit to be turned on while controlling the upper bridge switch tube of the first switch control unit to be turned on. At this time, the lower bridge switch tube of the first switch control unit and the upper bridge switch tube of the second switch control unit remain turned off.

[0161] When the lower bridge switch tube of the first switch control unit is controlled to be turned on, the upper bridge switch tube of the second switch control unit is controlled to be turned on. At this time, the upper bridge switch tube of the first switch control unit and the lower bridge switch tube of the second switch control unit remain turned off.

[0162] When the first switch control unit and the second switch control unit both include an upper bridge switch tube and a lower bridge switch tube, the vehicle controller can control an upper bridge switch tube of the first switch control unit to be turned on, and a lower bridge switch tube of the second switch control unit to be turned on, and control a lower bridge switch tube of the first switch control unit and an upper bridge switch tube of the second switch control unit to remain turned off.

[0163] Afterwards, the vehicle controller can control a lower bridge switch tube of the first switch control unit to be turned on, and an upper bridge switch tube of the second switch control unit to be turned on, and can control an upper bridge switch tube of the first switch control unit and a lower bridge switch tube of the second switch control unit to remain turned off.

[0164] When the first switch control unit and the second switch control unit both include multiple upper bridge switch tubes and multiple lower bridge switch tubes, the vehicle controller can control at least one upper bridge switch tube of the first switch control unit to be turned on, and at least one lower bridge switch tube of the second switch control unit to be turned on, and control all the multiple lower bridge switch tubes of the first switch control unit and the multiple upper bridge switch tubes of the second switch control unit to remain turned off.

[0165] Afterwards, at least one lower bridge switch tube of the first switch control unit is controlled to be turned on, and at least one upper bridge switch tube of the second switch control unit is controlled to be turned on, and all the multiple upper bridge switch tubes of the first switch control unit and the multiple lower bridge switch tubes of the second switch control unit are controlled to remain turned off.

[0166] In some embodiments, the vehicle controller may further control the first switch to close.

[0167] The vehicle controller may control the first switch to be closed, and when at least one upper bridge switch tube of the drive control circuit of the first motor is turned on, at least one lower bridge switch tube of the drive control circuit of the second motor is turned on;

[0168] In some embodiments, the first switch control unit is a drive control circuit for the first motor, and the second switch control unit is a drive control circuit for the second motor.

[0169] When the vehicle controller controls at least one lower bridge switch tube of the drive control circuit of the first motor to be turned on, the vehicle controller controls at least one upper bridge switch tube of the drive control circuit of the second motor to be turned on.

[0170] In some embodiments, the vehicle controller can control at least one upper-bridge switch in the drive control circuit of the first motor to be turned on, and at least one lower-bridge switch in the drive control circuit of the second motor to be turned on, during a first time period. During a second time period, when the at least one lower-bridge switch in the drive control circuit of the first motor is turned on, the at least one upper-bridge switch in the drive control circuit of the second motor is turned on. This allows the switches in the drive control circuit of the first motor and the drive control circuit of the second motor to be alternately turned on and off according to a predetermined timing sequence, thereby enabling the battery to self-heat.

[0171] In some embodiments, the first time period and the second time period are alternated, and the predetermined time sequence may include at least one alternating first time period and second time period.

[0172] In some embodiments, the vehicle controller may control the upper bridge switch tubes of the drive control circuit of the first motor and the lower bridge switch tubes of the drive control circuit of the second motor to be all turned on in a first time period, and control the lower bridge switch tubes of the drive control circuit of the first motor and the upper bridge switch tubes of the drive control circuit of the second motor to remain all turned off; and control the lower bridge switch tubes of the drive control circuit of the first motor and the upper bridge switch tubes of the drive control circuit of the second motor to be all turned on in a second time period, and control the upper bridge switch tubes of the drive control circuit of the first motor and the lower bridge switch tubes of the drive control circuit of the second motor to remain all turned off.

[0173] In some embodiments, referring to Figure 5, the vehicle controller can control the first switch K1 to be closed in response to the battery self-heating instruction, and in the first time period, control the upper bridge switch tubes (i.e., the first switch tube Q1 to the third switch tube Q3) of the drive control circuit of the first motor and the lower bridge switch tubes (i.e., the tenth switch tube Q10 to the twelfth switch tube Q12) of the drive control circuit of the second motor to be all turned on, and control the lower bridge switch tubes (i.e., the fourth switch tube Q4 to the sixth switch tube Q6) of the drive control circuit of the first motor and the upper bridge switch tubes (i.e., the seventh switch tube Q7 to the ninth switch tube Q9) of the drive control circuit of the second motor to remain all turned off.

[0174] Referring to Figure 6, in the second time period, the vehicle controller can control the lower bridge switch tubes (i.e., the fourth switch tube Q4 to the sixth switch tube Q6) of the drive control circuit of the first motor and the upper bridge switch tubes (i.e., the seventh switch tube Q7 to the ninth switch tube Q9) of the drive control circuit of the second motor to be all turned on, and the upper bridge switch tubes (i.e., the first switch tube Q1 to the third switch tube Q3) of the drive control circuit of the first motor and the lower bridge switch tubes (i.e., the tenth switch tube Q10 to the twelfth switch tube Q12) of the drive control circuit of the second motor to remain all turned off.

[0175] After the battery self-heating is completed, the vehicle controller can execute step 1903 or step 1904 according to the corresponding instructions.

[0176] Step 1903: In response to the direct charging instruction, control the external charging device to directly charge the battery.

[0177] The vehicle controller may also control an external charging device to directly charge the battery in response to a direct charging instruction.

[0178] In the embodiment of the present disclosure, the vehicle controller may control the upper bridge switch of the third switch control unit to be turned on in response to a direct charging instruction, so that an external charging device can directly charge the battery.

[0179] In some embodiments, the vehicle controller controls the first charging switch and the second charging switch to be closed, and controls at least one upper bridge switch tube of the drive control circuit of the third motor to be turned on, so that the external charging device can directly charge the battery.

[0180] Here, the third switch control unit is a drive control circuit of the third motor.

[0181] In some embodiments, when the external charging device 200 directly charges the battery 10 , the vehicle controller may control all the upper bridge switch tubes of the third switch control unit to be turned on and all the lower bridge switch tubes to be turned off.

[0182] Referring to Figure 13, the vehicle controller can respond to the direct charging instruction to control the first charging switch S1 and the second charging switch S2 to be closed, control at least one upper bridge switch tube (i.e., the thirteenth switch tube Q13 to the fifteenth switch tube Q15) of the drive control circuit of the third motor to be turned on, and all the lower bridge switch tubes (i.e., the sixteenth switch tube Q16 to the eighteenth switch tube Q18) to be turned off.

[0183] In some embodiments of the present disclosure, the vehicle controller may control the second charging switch and the third charging switch to be closed in response to a direct charging instruction, so that an external charging device can directly charge the battery.

[0184] 17 , the vehicle controller may control the second charging switch S2 and the third charging switch S3 to be closed in response to a direct charging instruction, so as to enable the external charging device 200 to directly charge the battery 10 .

[0185] Step 1904: In response to the boost charging instruction, control the boost unit to boost the voltage output by the external charging device to charge the battery.

[0186] The vehicle controller may control the boost unit to boost the voltage output by the external charging device in response to the boost charging instruction to charge the battery.

[0187] In some embodiments, the vehicle controller may control the upper bridge switch and the lower bridge switch of the third switch control unit of the boost unit to be alternately turned on and off to boost the voltage output by the external charging device.

[0188] In some embodiments, the vehicle controller can control the first charging switch and the second charging switch to be closed, and control the upper bridge switch tube and the lower bridge switch tube of the same bridge arm in the drive control circuit of the third motor to be alternately turned on and off.

[0189] Here, the boost inductor of the boost unit is the winding of the third motor, and the third switch control unit is the drive control circuit of the third motor.

[0190] When the external charging device boosts and charges the battery, the vehicle controller can control the upper bridge switch tube and the lower bridge switch tube of at least one phase bridge arm in the drive control circuit of the third motor to be alternately turned on and off.

[0191] 12 , the vehicle controller may control the sixteenth to eighteenth switching tubes Q16 to Q18 in the drive control circuit of the third motor to be turned on and the thirteenth to fifteenth switching tubes Q13 to Q15 to be turned off in response to the boost charging instruction.

[0192] 13 , the vehicle controller can turn on the thirteenth to fifteenth switches Q13 to Q15 and turn off the sixteenth to eighteenth switches Q16 to Q18 , and repeat this process to enable the external charging device 200 to boost and charge the battery 10 .

[0193] In summary, some embodiments of the present disclosure provide a control method, in which a vehicle controller can control the switch tube of the first switch control unit and the switch tube of the second switch control unit to be alternately turned on and off according to a predetermined timing, so as to self-heat the battery through the charging and discharging of the inductive device unit, thereby avoiding the battery charging and discharging power being affected in a low temperature environment.

[0194] Some embodiments of the present disclosure provide a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the control methods shown in the above embodiments, for example, the control methods shown in Figures 18 and 19 .

[0195] FIG20 is a schematic diagram of the structure of a vehicle controller according to some embodiments. As shown in FIG20 , the vehicle controller 30 may include a memory 2001, a processor 2002, and a computer program stored in the memory 2001 and executable on the processor 2002. When the processor 2002 executes the computer program, the control method described in the above embodiments is implemented, for example, the control method shown in FIG18 and FIG19 .

[0196] It should be noted that the logic and / or steps represented in the flowcharts or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing the logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, apparatus, or device and execute the instructions), or in conjunction with such instruction execution systems, apparatuses, or devices. For purposes of this disclosure, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transmit a program for use by an instruction execution system, apparatus, or device, or in conjunction with such instruction execution systems, apparatuses, or devices. More specific examples (non-exhaustive list) of computer-readable media include the following: an electrical connection portion having one or more wires (electronic device), a portable computer disk cartridge (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disc read-only memory (CDROM). Furthermore, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing it in another suitable manner if necessary, and then storing it in a computer memory.

[0197] It should be understood that various parts of the present disclosure can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used to implement: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application-specific integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0198] In the description of this disclosure, reference to the terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the disclosure. In this disclosure, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0199] In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present disclosure.

[0200] In addition, the terms "first" and "second" used in some embodiments of the present disclosure are only used for descriptive purposes and should not be understood as indicating or implying relative importance, or implicitly indicating the number of technical features indicated in this embodiment. Therefore, the features defined by the terms "first" and "second" in some embodiments of the present disclosure may explicitly or implicitly indicate that at least one of the features is included in the embodiment. In the description of the present disclosure, the word "multiple" means at least two or two or more, such as two, three, four, etc., unless otherwise clearly and specifically defined in the embodiments.

[0201] In this disclosure, unless otherwise clearly specified or limited in the embodiments, the terms "installed," "connected," "connect," and "fixed" appearing in the embodiments should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integral connection. It can also be a mechanical connection, an electrical connection, etc.; of course, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication between two elements, or the interaction between two elements. For those skilled in the art, the specific meanings of the above terms in this disclosure can be understood based on the specific implementation.

[0202] In the present disclosure, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0203] Although the embodiments of the present disclosure have been shown and described above, it is understood that the above embodiments are illustrative and are not to be construed as limitations on the present disclosure. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present disclosure.

Claims

1. A control circuit (20), comprising: A first switch control unit (21) and a second switch control unit (22); an inductive device unit (23) disposed between the first switch control unit (21) and the second switch control unit (22); The switch tube of the first switch control unit (21) and the switch tube of the second switch control unit (22) are alternately turned on and off according to a predetermined timing sequence, so as to self-heat the battery (10) through the charging and discharging of the inductive device unit (23).

2. The control circuit (20) according to claim 1, wherein: The first switch control unit (21) and the second switch control unit (22) respectively include an upper bridge switch tube and a lower bridge switch tube; A first node is provided between the upper bridge switch tube and the lower bridge switch tube of the first switch control unit (21), and a second node is provided between the upper bridge switch tube and the lower bridge switch tube of the second switch control unit (22); The inductive device unit (23) is connected between the first node and the second node.

3. The control circuit (20) according to claim 2, wherein: When the upper bridge switch tube of the first switch control unit (21) is turned on, the lower bridge switch tube of the second switch control unit (22) is turned on; Wherein, the lower bridge switch tube of the first switch control unit (21) and the upper bridge switch tube of the second switch control unit (22) remain turned off; When the lower bridge switch tube of the first switch control unit (21) is turned on, the upper bridge switch tube of the second switch control unit (22) is turned on; The upper bridge switch tube of the first switch control unit (21) and the lower bridge switch tube of the second switch control unit (22) remain turned off.

4. The control circuit (20) according to any one of claims 1 to 3, wherein: The inductive device unit (23) includes a winding (V1) of a first motor, a winding (V2) of a second motor, and a first switch (K1), wherein the first switch (K1) is connected between a neutral point of the winding of the first motor and a neutral point of the winding of the second motor; Wherein, when the first switch (K1) is closed, the winding (V1) of the first motor and the winding (V2) of the second motor are charged and discharged based on the alternating on and off of the switch tubes of the first switch control unit (21) and the second switch control unit (22).

5. The control circuit (20) according to claim 4, wherein: The first switch control unit (21) is a drive control circuit for the first motor, and the second switch control unit (22) is a drive control circuit for the second motor.

6. The control circuit (20) according to claim 5, wherein: When at least one upper bridge switch tube of the drive control circuit of the first motor is turned on, at least one lower bridge switch tube of the drive control circuit of the second motor is turned on; When at least one lower-bridge switch tube of the drive control circuit of the first motor is turned on, at least one upper-bridge switch tube of the drive control circuit of the second motor is turned on.

7. The control circuit (20) according to any one of claims 1 to 6, further comprising: A pre-charging unit (24) is connected in series with the battery (10) and then connected to a DC bus, so as to pre-charge a bus capacitor connected to the DC bus based on the power supply of the battery (10).

8. The control circuit (20) according to any one of claims 1 to 6, further comprising: A boost unit (25) is adapted to boost the voltage output by an external charging device to charge the battery (10).

9. The control circuit (20) according to claim 8, wherein: The boost unit (25) comprises: a boost inductor (251), one end of the boost inductor (251) being suitable for being connected to the positive terminal of the external charging device (200); A third switch control unit (252), wherein a third node is provided between an upper bridge switch tube and a lower bridge switch tube of the third switch control unit (252), and the third node is connected to the other end of the boost inductor (251); The upper bridge switch tube and the lower bridge switch tube of the third switch control unit (252) are alternately turned on and off to boost the voltage output by the external charging device (200).

10. The control circuit (20) according to claim 9, further comprising a first charging switch (S1) and a second charging switch (S2); The boost inductor (251) is a winding of a third motor, the third switch control unit (252) is a drive control circuit of the third motor, the neutral point of the winding of the third motor is connected to the positive terminal of the external charging device (200) through the first charging switch (S1), and the negative terminal of the drive control circuit of the third motor is connected to the negative terminal of the external charging device (200) through the second charging switch (S2); in, When the first charging switch (S1) and the second charging switch (S2) are closed, the upper bridge switch tube and the lower bridge switch tube of the same bridge arm in the drive control circuit of the third motor are alternately turned on and off, so that the external charging device (200) performs boost charging on the battery (10).

11. The control circuit (20) according to claim 10, further comprising: a third charging switch (S3), one end of the third charging switch (S3) being connected to the positive DC bus, and the other end of the third charging switch (S3) being suitable for connecting to the positive terminal of the external charging device (200); Wherein, when the second charging switch (S2) and the third charging switch (S3) are closed, the external charging device (200) directly charges the battery (10).

12. A control method comprising: In response to a battery self-heating instruction, the switch tube of the first switch control unit (21) and the switch tube of the second switch control unit (22) are controlled to be alternately turned on and off according to a predetermined time sequence, so as to self-heat the battery (10) through the charging and discharging of the inductive device unit (23); Wherein, the inductive device unit (23) is arranged between the first switch control unit and the second switch control unit.

13. The method according to claim 12, wherein: The method for controlling the switch tube of the first switch control unit (21) and the switch tube of the second switch control unit (22) to be alternately turned on and off according to a predetermined time sequence comprises: When the upper bridge switch tube of the first switch control unit (21) is controlled to be turned on, the lower bridge switch tube of the second switch control unit (22) is controlled to be turned on; Wherein, the lower bridge switch tube of the first switch control unit (21) and the upper bridge switch tube of the second switch control unit (22) remain turned off; When the lower bridge switch tube of the first switch control unit (21) is controlled to be turned on, the upper bridge switch tube of the second switch control unit (22) is controlled to be turned on; The upper bridge switch tube of the first switch control unit (21) and the lower bridge switch tube of the second switch control unit (22) remain turned off.

14. The method according to claim 12, wherein: The method for controlling the switch tube of the first switch control unit (21) and the switch tube of the second switch control unit (22) to be alternately turned on and off according to a predetermined time sequence comprises: When at least one upper bridge switch tube of the drive control circuit for controlling the first motor is turned on, at least one lower bridge switch tube of the drive control circuit for controlling the second motor is turned on; When at least one lower-bridge switch tube of the drive control circuit of the first motor is turned on, at least one upper-bridge switch tube of the drive control circuit of the second motor is turned on; The first switch control unit is a drive control circuit for the first motor, and the second switch control unit is a drive control circuit for the second motor.

15. The method according to any one of claims 12 to 14, further comprising: In response to a pre-charging instruction, the pre-charging unit (24) is controlled to pre-charge a bus capacitor connected to the DC bus based on the power supply of the battery (10).

16. The method according to any one of claims 12 to 14, further comprising: In response to a boost charging instruction, the boost unit (25) is controlled to boost the voltage output by the external charging device to charge the battery (10).

17. The method according to claim 16, wherein The control boost unit (25) boosts the voltage output by the external charging device (200), including: The upper bridge switch tube and the lower bridge switch tube of the third switch control unit (252) of the boost unit (25) are controlled to be alternately turned on and off, so as to boost the voltage output by the external charging device (200).

18. The method according to claim 17, wherein The upper bridge switch tube and the lower bridge switch tube of the third switch control unit (252) controlling the boost unit (25) are alternately turned on and off, comprising: Controlling the first charging switch (S1) and the second charging switch (S2) to close; Controlling the upper bridge switch tube and the lower bridge switch tube of the same bridge arm in the drive control circuit of the third motor to be alternately turned on and off; The boost inductor (251) of the boost unit (25) is the winding of the third motor, and the third switch control unit (252) is the drive control circuit of the third motor.

19. The method according to claim 18, further comprising: In response to a direct charging instruction, the second charging switch (S2) and the third charging switch (S3) are controlled to be closed, so that the external charging device (200) directly charges the battery (10).

20. A computer-readable storage medium having a computer program stored thereon, wherein the computer program implements the control method according to any one of claims 12 to 19 when executed by a processor.

21. A vehicle controller (30), comprising: A memory (2001), a processor (2002), and a computer program stored in the memory (2001) and executable on the processor (2002), wherein when the processor (2002) executes the computer program, the control method according to any one of claims 12 to 19 is implemented.

22. An electric vehicle (100), comprising: The control circuit (20) according to any one of claims 1 to 11; or The vehicle controller (30) according to claim 21.

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