Power battery charging system and vehicle

Abstract

The utility model relates to a power battery charging system and a vehicle. The power battery charging system comprises a controller, a driving motor, a driving motor controller, a switch module comprising a first relay, a second relay and a third relay, the switch module further comprises at least one relay except the first relay, and the at least one relay is arranged between different windings of the driving motor. The controller is used for controlling the third relay and the first power switch to be switched on under the condition that the boost charging condition is met, controlling the second relay and other power switches except the first power switch in the driving motor controller to be switched off, and controlling the switch module to be communicated with a three-phase winding in the driving motor in a series connection mode. The three-phase winding, the first power switch and the power battery are connected in series, so that the direct-current power supply module carries out boosting charging on the power battery through the first loop.

Description

Technical Field

[0001] The present disclosure relates to the field of batteries, and in particular, to a power battery charging system and a vehicle. Background Art

[0002] With the development of new energy technologies, the role of power batteries in vehicles is becoming increasingly important, and high-voltage platforms are gradually becoming the development trend of new energy vehicles. However, when a vehicle is equipped with a high-voltage power battery, when the power battery is charged by an external charging method, the voltage of the external power supply is usually not enough to charge the power battery and cannot meet the high-voltage charging requirements. Utility Model Content

[0003] The purpose of the present disclosure is to provide a power battery charging system and a vehicle.

[0004] In order to achieve the above-mentioned object, according to a first aspect of the present disclosure, there is provided a power battery charging system, comprising: a controller, a drive motor, a drive motor controller connected to the drive motor, a switch module including a first relay, a second relay and a third relay; the switch module further comprises at least one relay other than the first relay, and the at least one relay is respectively arranged between different windings of the drive motor;

[0005] The first end of the first relay is connected to the positive end of the DC power supply module, and the second end of the first relay is connected to the drive motor; the first end of the second relay is connected to the positive end of the DC power supply module, and the second end of the second relay is connected to the first end of the third relay; the second end of the third relay is connected to the positive electrode of the power battery; the upper end of the three-phase bridge arm of the drive motor controller is connected to the first end of the third relay, and the lower end of the three-phase bridge arm of the drive motor controller is respectively connected to the negative end of the DC power supply module and the negative electrode of the power battery;

[0006] The controller is used to control the third relay and the first power switch to be turned on, and control the second relay and the remaining power switches in the drive motor controller except the first power switch to be turned off when the boost charging condition is met, and control the switch module to connect the three-phase winding in the drive motor in series to form a first circuit including the three-phase winding connected in series, the first power switch and the power battery, so that the DC power supply module performs boost charging on the power battery through the first circuit; wherein the first power switch is a power switch at the upper end of one of the three-phase bridge arms of the drive motor controller.

[0007] Optionally, the controller is also used to control the conduction of the second power switch, and control the second relay, the third relay and the remaining power switches in the drive motor controller except the second power switch to be disconnected, and control the switch module to connect the three-phase winding in the drive motor in series to form a second circuit including the three-phase winding connected in series and the second power switch, so that the DC power supply module stores energy of the inductance of the three-phase winding of the drive motor through the second circuit; wherein, the second power switch is a power switch at the lower end of a bridge arm in the three-phase bridge arm of the drive motor controller.

[0008] Optionally, the switch module includes a fourth relay and a fifth relay;

[0009] The first end of the fourth relay is respectively connected to the first end of the first phase winding and the first end of the second phase winding of the drive motor, and the second end of the fourth relay is respectively connected to the second end of the first relay and the first end of the third phase winding of the drive motor; the first end of the fifth relay is connected to the lead wire of the second end of the third phase winding, and the second end of the fifth relay is connected to the lead wire of the second end of the second phase winding;

[0010] When the first power switch is the power switch of the upper bridge arm of the first phase in the drive motor controller, the controller is used to control the fourth relay to disconnect, and control the first relay and the fifth relay to turn on, so that the third phase winding, the second phase winding, the first phase winding and the first power switch are connected in series in sequence.

[0011] Optionally, when the second power switch is the power switch of the lower bridge arm of the first phase in the drive motor controller, the controller is used to control the fourth relay to disconnect, and control the first relay and the fifth relay to turn on, so that the third phase winding, the second phase winding, the first phase winding and the second power switch are connected in series in sequence.

[0012] Optionally, the switch module includes a sixth relay and a seventh relay;

[0013] The first end of the sixth relay is connected to the second end of the first relay and the first end of the first phase winding of the drive motor, respectively, and the second end of the sixth relay is connected to the first end of the second phase winding of the drive motor and the first end of the third phase winding, respectively; the first end of the seventh relay is connected to the lead wire of the second end of the first phase winding, and the second end of the seventh relay is connected to the lead wire of the second end of the third phase winding;

[0014] When the first power switch is the power switch of the upper bridge arm of the second phase in the drive motor controller, the controller is used to control the sixth relay to disconnect, and control the first relay and the seventh relay to turn on, so that the first phase winding, the third phase winding, the second phase winding and the first power switch are connected in series in sequence.

[0015] Optionally, when the second power switch is the power switch of the lower bridge arm of the second phase in the drive motor controller, the controller is used to control the sixth relay to disconnect, and control the first relay and the seventh relay to turn on, so that the first phase winding, the third phase winding, the second phase winding and the second power switch are connected in series in sequence.

[0016] Optionally, the switch module includes an eighth relay, a ninth relay, a tenth relay, an eleventh relay, a twelfth relay and a thirteenth relay;

[0017] The first end of the eighth relay is respectively connected to the positive end of the DC power supply module and the first end of the first relay, and the second end of the eighth relay is respectively connected to the first end of the tenth relay and the first end of the third phase winding of the drive motor; the first end of the ninth relay is respectively connected to the second end of the first relay and the first end of the first phase winding of the drive motor, and the second end of the ninth relay is respectively connected to the second end of the tenth relay and the first end of the second phase winding of the drive motor; the first end of the tenth relay is also connected to the first end of the third phase winding, and the second end of the tenth relay is also connected to the first end of the second phase winding; the first end of the eleventh relay is connected to the first phase lead wire of the drive motor, and the second end of the eleventh relay is connected to the second phase lead wire of the drive motor; the first end of the twelfth relay is connected to the first phase lead wire of the drive motor, and the second end of the twelfth relay is connected to the third phase lead wire of the drive motor; the first end of the thirteenth relay is connected to the second phase lead wire of the drive motor, and the second end of the thirteenth relay is connected to the third phase lead wire of the drive motor;

[0018] The controller is used to control the on and off of the first relay, the eighth relay, the ninth relay, the tenth relay, the eleventh relay, the twelfth relay and the thirteenth relay so that the three-phase windings in the drive motor are connected in series.

[0019] Optionally, when the first power switch is a power switch of an upper bridge arm of a first phase in the drive motor controller, the controller is used to control the first relay, the tenth relay, the eleventh relay and the twelfth relay to be disconnected, and control the eighth relay, the ninth relay and the thirteenth relay to be turned on, so that the third phase winding, the second phase winding, the first phase winding and the first power switch are sequentially connected in series;

[0020] When the second power switch is the power switch of the lower bridge arm of the first phase, the controller is used to control the first relay, the tenth relay, the eleventh relay and the twelfth relay to be disconnected, and control the eighth relay, the ninth relay and the thirteenth relay to be turned on, so that the third phase winding, the second phase winding, the first phase winding and the second power switch are connected in series in sequence.

[0021] Optionally, when the first power switch is the power switch of the upper bridge arm of the second phase in the drive motor controller: the controller is used to control the first relay, the tenth relay, the eleventh relay and the thirteenth relay to be disconnected, and control the eighth relay, the ninth relay and the twelfth relay to be turned on, so that the third phase winding, the first phase winding, the second phase winding and the first power switch are connected in series in sequence; or, the controller is used to control the eighth relay, the ninth relay, the eleventh relay and the thirteenth relay to be disconnected, and control the first relay, the tenth relay and the twelfth relay to be turned on, so that the first phase winding, the third phase winding, the second phase winding and the first power switch are connected in series in sequence;

[0022] When the second power switch is the power switch of the lower bridge arm of the second phase: the controller is used to control the first relay, the tenth relay, the eleventh relay and the thirteenth relay to be disconnected, and control the eighth relay, the ninth relay and the twelfth relay to be turned on, so that the third phase winding, the first phase winding, the second phase winding and the second power switch are connected in series in sequence; or, the controller is used to control the eighth relay, the ninth relay, the eleventh relay and the thirteenth relay to be disconnected, and control the first relay, the tenth relay and the twelfth relay to be turned on, so that the first phase winding, the third phase winding, the second phase winding and the second power switch are connected in series in sequence.

[0023] Optionally, when the first power switch is a power switch of an upper bridge arm of the third phase in the drive motor controller, the controller is used to control the eighth relay, the ninth relay, the twelfth relay and the thirteenth relay to be disconnected, and control the first relay, the tenth relay and the eleventh relay to be turned on, so that the first phase winding, the second phase winding, the third phase winding and the first power switch are connected in series in sequence;

[0024] When the second power switch is the power switch of the lower bridge arm of the third phase, the controller is used to control the eighth relay, the ninth relay, the twelfth relay and the thirteenth relay to be disconnected, and control the first relay, the tenth relay and the eleventh relay to be turned on, so that the first phase winding, the second phase winding, the third phase winding and the second power switch are connected in series in sequence.

[0025] Optionally, if each phase winding of the drive motor includes more than one branch winding, the controller is used to control the switch module to connect each branch winding in the drive motor in series.

[0026] Optionally, if each phase winding of the drive motor includes two branch windings, the drive motor includes a first branch winding and a second branch winding corresponding to the first phase, a third branch winding and a fourth branch winding corresponding to the second phase, and a fifth branch winding and a sixth branch winding corresponding to the third phase, the first phase lead wire of the drive motor is led out via the first branch winding, the second phase lead wire of the drive motor is led out via the third branch winding, and the third phase lead wire of the drive motor is led out via the sixth branch winding;

[0027] The switch module includes a fourteenth relay, a fifteenth relay, a sixteenth relay, a seventeenth relay, an eighteenth relay, a nineteenth relay, and a twentieth relay;

[0028] The second end of the first relay is respectively connected to the third phase lead wire of the drive motor and the second end of the eighteenth relay; the first end of the fourteenth relay is connected to the first ends of the two branch windings of the first phase of the drive motor, and the second end of the fourteenth relay is respectively connected to the first ends of the two branch windings of the second phase of the drive motor and the first end of the fifteenth relay; the second end of the fifteenth relay is connected to the first ends of the two branch windings of the third phase of the drive motor; the first end of the sixteenth relay is connected to the first phase lead wire, and the second end of the sixteenth relay is respectively connected to the second branch winding of the first phase of the drive motor and the first end of the nineteenth relay; the second end of the nineteenth relay is respectively connected to the second phase lead wire and the first end of the seventeenth relay; the first end of the seventeenth relay is connected to the second phase lead wire, and the second end of the seventeenth relay is connected to the second end of the fourth branch winding and the first end of the twentieth relay; the second end of the twentieth relay is respectively connected to the fifth branch winding and the first end of the eighteenth relay; the first end of the eighteenth relay is connected to the second end of the fifth branch winding, and the second end of the eighteenth relay is connected to the third phase lead wire;

[0029] The controller is used to control the fourteenth relay, the fifteenth relay, the sixteenth relay, the seventeenth relay and the eighteenth relay to be disconnected, and control the nineteenth relay and the twentieth relay to be turned on, so that the branch windings in the drive motor are connected in series.

[0030] Optionally, if each phase winding of the drive motor includes three branch windings, the drive motor includes: a first branch winding, a second branch winding and a third branch winding corresponding to the first phase, a fourth branch winding, a fifth branch winding and a sixth branch winding corresponding to the second phase, and a seventh branch winding, an eighth branch winding and a ninth branch winding corresponding to the third phase, a first phase lead wire of the drive motor is led out via the first branch winding, a second phase lead wire of the drive motor is led out via the fourth branch winding, and a third phase lead wire of the drive motor is led out via the seventh branch winding;

[0031] The switch module includes a twenty-first relay, a twenty-second relay, a twenty-third relay, a twenty-fourth relay, a twenty-fifth relay, a twenty-sixth relay, a twenty-seventh relay and a twenty-eighth relay;

[0032] The first end of the first relay is respectively connected to the first end of the ninth branch winding of the drive motor and the second end of the twenty-sixth relay; the first end of the twenty-first relay is connected to the first phase lead-out line, and the second end of the twenty-first relay is respectively connected to the second end of the second branch winding and the second end of the third branch winding; the first end of the twenty-second relay is respectively connected to the first end of the first branch winding and the first end of the second branch winding, and the second end of the twenty-second relay is respectively connected to the first end of the third branch winding, the first end of the fourth branch winding and the first end of the twenty-third relay; the first end of the twenty-third relay is also connected to the first end of the fourth branch winding, and the second end of the twenty-third relay is respectively connected to the first end of the fifth branch winding, the first end of the sixth branch winding and the first end of the twenty-eighth relay; the first end of the twenty-fourth relay is respectively connected to the second phase lead-out line and the fifth The second end of the branch winding, the second end of the twenty-fourth relay is respectively connected to the second end of the sixth branch winding and the first end of the twenty-seventh relay; the first end of the twenty-fifth relay is respectively connected to the second end of the twenty-seventh relay and the third phase lead-out line, and the second end of the twenty-fifth relay is respectively connected to the second end of the eighth branch winding and the second end of the ninth branch winding; the first end of the twenty-sixth relay is respectively connected to the first end of the seventh branch winding, the first end of the eighth branch winding and the second end of the twenty-eighth relay, and the second end of the twenty-sixth relay is connected to the first end of the ninth branch winding; the first end of the twenty-seventh relay is connected to the second end of the sixth branch winding; the first end of the twenty-eighth relay is connected to the first end of the fifth branch winding and the first end of the sixth branch winding, and the second end of the twenty-eighth relay is connected to the first end of the seventh branch winding and the first end of the eighth branch winding;

[0033] The controller is used to control the 21st relay, the 22nd relay, the 23rd relay, the 24th relay, the 25th relay, the 26th relay and the 28th relay to be disconnected, and control the 27th relay to be turned on, so that the branch windings in the drive motor are connected in series.

[0034] According to a second aspect of the present disclosure, a vehicle is provided, comprising a power battery and the power battery charging system according to the first aspect of the present disclosure.

[0035] Through the above technical solution, by adding a switch module, the three-phase winding of the motor can form a series connection relationship through the switch module under the control of the controller to increase the inductance of the motor, and then the inductance of the three-phase winding of the series motor itself can be used to release energy, weaken the change in current, and assist the DC power supply module to charge the power battery, so as to achieve boost charging of the power battery without adding additional inductor equipment.

[0036] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0038] Figure 1 is a block diagram of a power battery charging system provided according to an embodiment of the present disclosure;

[0039] Figure 2 is an exemplary schematic diagram of a partial circuit in a power battery charging system provided according to an embodiment of the present disclosure;

[0040] Figure 3 is another exemplary schematic diagram of a partial circuit in a power battery charging system provided according to an embodiment of the present disclosure;

[0041] Figure 4 is another exemplary schematic diagram of a partial circuit in a power battery charging system provided according to an embodiment of the present disclosure;

[0042] Figure 5 is another exemplary schematic diagram of a partial circuit in a power battery charging system provided according to an embodiment of the present disclosure;

[0043] Figure 6 is another exemplary schematic diagram of a partial circuit in a power battery charging system provided according to an embodiment of the present disclosure;

[0044] Figure 7 is another exemplary schematic diagram of a partial circuit in a power battery charging system provided according to an embodiment of the present disclosure;

[0045] Figure 8 It is another exemplary schematic diagram of a partial circuit in a power battery charging system provided according to an embodiment of the present disclosure.

[0046] Description of Reference Numerals

[0047] 10 Controller 20 Drive Motor

[0048] 30 drive motor controller 40 switch module

[0049] K1 First relay K2 Second relay

[0050] K3 Third relay K41 Fourth relay

[0051] K51 Fifth relay K42 Sixth relay

[0052] K52 Seventh relay K43 Eighth relay

[0053] K53 ninth relay K63 tenth relay

[0054] K73 11th relay K83 12th relay

[0055] K93 13th relay K44 14th relay

[0056] K54 15th relay K64 16th relay

[0057] K74 17th relay K84 18th relay

[0058] K94 19th relay K104 20th relay

[0059] K45 21st relay K55 22nd relay

[0060] K65 23rd relay K75 24th relay

[0061] K85 25th relay K95 26th relay

[0062] K105 27th relay K115 28th relay DETAILED DESCRIPTION

[0063] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0064] Figure 1 1 is a block diagram of a power battery charging system provided according to an embodiment of the present disclosure. The power battery system may include: a controller 10, a drive motor 20, a drive motor controller 30 connected to the drive motor 20, a switch module 40 including a first relay K1, a second relay K2 and a third relay K3; the switch module 40 also includes at least one relay other than the first relay K1, and the at least one relay is respectively arranged between different windings of the drive motor 20.

[0065] Among them, the first end of the first relay K1 is connected to the positive end of the DC power supply module, and the second end of the first relay K1 is connected to the drive motor 20; the first end of the second relay K2 is connected to the positive end of the DC power supply module, and the second end of the second relay K2 is connected to the first end of the third relay K3; the second end of the third relay K3 is connected to the positive electrode of the power battery; the upper end of the three-phase bridge arm of the drive motor controller 30 is connected to the first end of the third relay K3, and the lower end of the three-phase bridge arm of the drive motor controller 30 is respectively connected to the negative end of the DC power supply module and the negative electrode of the power battery.

[0066] Based on the above structure, the controller 10 can control the third relay K3 and the first power switch to be turned on, and control the second relay K2 and the remaining power switches in the drive motor controller 30 except the first power switch to be turned off when the boost charging conditions are met, and control the switch module 40 to connect the three-phase winding in the drive motor 20 in series to form a first circuit including the three-phase winding connected in series, the first power switch and the power battery, so that the DC power supply module boosts and charges the power battery through the first circuit; wherein the first power switch is a power switch at the upper end of one of the three-phase bridge arms of the drive motor controller 30.

[0067] The controller 10 is used to send control signals to devices in the power battery charging system. Optionally, the controller 10 can control the on and off of any relay included in the power battery charging system. Optionally, the controller 10 can control any drive motor controller included in the power battery charging system. When the controller 10 controls the drive motor controller, it can send a control signal to the control module of the drive motor controller, and the control module of the drive motor controller controls the motor controller according to the control signal. By way of example, the controller 10 can be a vehicle controller.

[0068] The DC power supply module can be a charging pile or a charging port that can be connected to the charging pile. The negative terminal of the DC power supply module is connected to the negative electrode of the power battery. Based on this, when the second relay K2 and the third relay K3 are closed, a connected loop can be formed between the DC power supply module and the power battery, and the DC power supply module can supply power to the power battery to a certain extent through the connected loop. If only this loop is connected, it is equivalent to the DC power supply module directly supplying power to the power battery.

[0069] The controller 10 can determine whether the boost charging condition is met based on the maximum output voltage and the minimum output voltage of the DC power supply module and the maximum voltage of the power battery to be charged. For example, if the power battery needs to be charged, and the maximum output voltage of the DC power supply module is lower than the maximum voltage of the power battery, it means that the voltage of the DC power supply module is not enough to supply the voltage required by the power battery. Therefore, it is necessary to boost the voltage to charge the power battery, and it can be determined that the boost charging condition is met. For another example, if the power battery needs to be charged, and the maximum voltage of the power battery is between the maximum output voltage and the minimum output voltage of the DC power supply module, it means that the voltage of the DC power supply module is enough to supply the power battery. Therefore, it can be determined that the boost charging condition is not met, and the DC power supply module is used to directly power the power battery.

[0070] Through the first relay K1 in the switch module 40, the DC power supply module can be connected to the drive motor 20 through the closure of the first relay K1, and based on the setting of other relays between the windings in the switch module 40, the series connection between the windings in the drive motor 20 can be achieved.

[0071] Optionally, the power switch involved in the present disclosure may be an IGBT (Insulated Gate Bipolar Transistor). Optionally, the power switch involved in the present disclosure may be a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor).

[0072] Based on this, if the switch module 40 is connected in series with the three-phase winding in the drive motor 20 and the first power switch is turned on at the same time, since the first power switch is a power switch of the upper bridge arm of the drive motor controller 30, it can be connected to the positive electrode of the power battery through the third relay K3. In this way, a first circuit including the three-phase winding connected in series, the first power switch and the power battery can be formed, so that the DC power supply module can boost and charge the power battery through the first circuit. When the DC power supply module boosts and charges the power battery through the first circuit, it actually uses the inductance of the winding connected in series in the drive motor 20 to assist in powering the power battery.

[0073] Through the above technical solution, by adding a switch module, the three-phase winding of the motor can form a series connection relationship through the switch module under the control of the controller to increase the inductance of the motor, and then the inductance of the three-phase winding of the series motor itself can be used to release energy, weaken the change in current, and assist the DC power supply module to charge the power battery, so as to achieve boost charging of the power battery without adding additional inductor equipment.

[0074] Optionally, the controller 10 is also used to control the conduction of the second power switch, and control the second relay K2, the third relay K3 and the remaining power switches in the drive motor controller 30 except the second power switch to be disconnected, and control the switch module 40 to connect the three-phase winding in the drive motor 20 in series to form a second circuit including the three-phase winding and the second power switch connected in series, so that the DC power supply module stores energy of the inductance of the three-phase winding of the drive motor 20 through the second circuit; wherein the second power switch is a power switch at the lower end of one of the three-phase bridge arms of the drive motor controller 30.

[0075] In this method, the DC power supply module and the three-phase windings of the drive motor 20 are essentially connected in series, so as to utilize the DC power supply module to store energy for the inductance of the three-phase windings of the drive motor, that is, to increase the inductance of the drive motor 20.

[0076] Accordingly, if the controller detects that the power battery has a power supply demand and meets the boost charging conditions, in order to achieve a better boost charging effect, the DC power supply module can first store energy of the inductance of the three-phase winding of the drive motor 20 through the second circuit according to this embodiment. Then, in the manner described above, the DC power supply module is used to assist the boost charging of the power battery through the first circuit and the drive motor 20 with increased inductance.

[0077] Optionally, the switch module 40 may include a fourth relay K41 and a fifth relay K51.

[0078] The first end of the fourth relay K41 is respectively connected to the first end of the first phase winding and the first end of the second phase winding of the drive motor 20, and the second end of the fourth relay K41 is respectively connected to the second end of the first relay K1 and the first end of the third phase winding of the drive motor 20; the first end of the fifth relay K51 is connected to the lead wire of the second end of the third phase winding, and the second end of the fifth relay K51 is connected to the lead wire of the second end of the second phase winding.

[0079] When the first power switch is the power switch of the upper bridge arm of the first phase in the driving motor controller 30, the controller 10 is used to control the fourth relay K41 to disconnect, and control the first relay K1 and the fifth relay K51 to turn on, so that the third phase winding, the second phase winding, the first phase winding and the first power switch are connected in series in sequence.

[0080] In this embodiment, the A phase can be the first phase, or the C phase can be the first phase.

[0081] Figure 2Schematic diagram of circuit connection when phase A is the first phase. When phase A is the first phase, the first power switch is the power switch of the upper bridge arm of phase A in the drive motor controller 30, that is, the boost charging of the power battery is realized through the bridge arm of phase A.

[0082] Based on Figure 2 When the circuit structure shown uses the A-phase bridge arm to boost and charge the power battery, the current flows as follows: the positive end of the DC power supply module → the first relay K1 → the C-phase winding of the drive motor 20 → the fifth relay K51 → the B-phase winding of the drive motor 20 → the A-phase winding of the drive motor 20 → the power switch at the upper end of the A-phase bridge arm of the drive motor controller 30 → the third relay K3 → the positive electrode of the power battery → the negative electrode of the power battery → the negative end of the DC power supply module.

[0083] Figure 3 Schematic diagram of circuit connection when phase C is the first phase. When phase C is the first phase, the first power switch is the power switch of the upper bridge arm of phase C in the drive motor controller 30, that is, the boost charging of the power battery is realized through the bridge arm of phase C.

[0084] Based on Figure 3 When the circuit structure shown uses the C-phase bridge arm to boost and charge the power battery, the current flows as follows: the positive end of the DC power supply module → the first relay K1 → the A-phase winding of the drive motor 20 → the fifth relay K51 → the B-phase winding of the drive motor 20 → the C-phase winding of the drive motor 20 → the power switch at the upper end of the C-phase bridge arm of the drive motor controller 30 → the third relay K3 → the positive electrode of the power battery → the negative electrode of the power battery → the negative end of the DC power supply module.

[0085] exist Figure 2 , Figure 3 In the figure, A, B, and C are used to identify the A-phase winding, B-phase winding, and C-phase winding respectively.

[0086] Optionally, when the second power switch is the power switch of the lower bridge arm of the first phase in the driving motor controller 30, the controller 10 is used to control the fourth relay K41 to disconnect, and control the first relay K1 and the fifth relay K51 to turn on, so that the third phase winding, the second phase winding, the first phase winding and the second power switch are connected in series in sequence.

[0087] When phase A is the first phase, the first power switch is the power switch of the lower bridge arm of phase A in the driving motor controller 30, that is, the energy storage of the motor winding inductance is realized through the bridge arm of phase A.

[0088] Based on Figure 2When the circuit structure shown uses the A-phase bridge arm to store energy in the motor winding inductance, the current flows as follows: the positive end of the DC power supply module → the first relay K1 → the C-phase winding of the drive motor 20 → the fifth relay K51 → the B-phase winding of the drive motor 20 → the A-phase winding of the drive motor 20 → the power switch at the lower end of the A-phase bridge arm of the drive motor controller 30 → the negative end of the DC power supply module.

[0089] When the C phase is the first phase, the first power switch is the power switch of the C phase lower bridge arm in the driving motor controller 30, that is, the energy storage of the motor winding inductance is realized through the C phase bridge arm.

[0090] Based on Figure 3 When the circuit structure shown uses the C-phase bridge arm to store energy in the motor winding inductance, the current flows as follows: the positive end of the DC power supply module → the first relay K1 → the A-phase winding of the drive motor 20 → the fifth relay K51 → the B-phase winding of the drive motor 20 → the C-phase winding of the drive motor 20 → the power switch at the lower end of the C-phase bridge arm of the drive motor controller 30 → the negative end of the DC power supply module.

[0091] In another embodiment, if Figure 4 As shown, the switch module 40 may include a sixth relay K42 and a seventh relay K52.

[0092] The first end of the sixth relay K42 is respectively connected to the second end of the first relay K1 and the first end of the first phase winding of the drive motor 20, and the second end of the sixth relay K42 is respectively connected to the first end of the second phase winding of the drive motor 20 and the first end of the third phase winding; the first end of the seventh relay K52 is connected to the lead wire of the second end of the first phase winding, and the second end of the seventh relay K52 is connected to the lead wire of the second end of the third phase winding.

[0093] When the first power switch is the power switch of the upper bridge arm of the second phase in the driving motor controller 30, the controller 10 is used to control the sixth relay K42 to disconnect, and control the first relay K1 and the seventh relay K52 to turn on, so that the first phase winding, the third phase winding, the second phase winding and the first power switch are connected in series in sequence.

[0094] In this embodiment, the B phase is the second phase. Accordingly, the first power switch is the power switch of the upper bridge arm of the B phase in the drive motor controller 30, that is, the boost charging of the power battery is achieved through the B phase bridge arm.

[0095] Based on Figure 4When the circuit structure shown uses the B-phase bridge arm to boost and charge the power battery, the current flows as follows: the positive end of the DC power supply module → the first relay K1 → the A-phase winding of the drive motor 20 → the seventh relay K52 → the C-phase winding of the drive motor 20 → the B-phase winding of the drive motor 20 → the power switch at the upper end of the B-phase bridge arm of the drive motor controller 30 → the third relay K3 → the positive electrode of the power battery → the negative electrode of the power battery → the negative end of the DC power supply module.

[0096] Optionally, when the second power switch is the power switch of the lower bridge arm of the second phase in the drive motor controller 30, the controller 10 is used to control the sixth relay K42 to disconnect, and control the first relay K1 and the seventh relay K52 to turn on, so that the first phase winding, the third phase winding, the second phase winding and the second power switch are connected in series in sequence.

[0097] In this embodiment, the B phase is the second phase. Accordingly, the second power switch is the power switch of the lower bridge arm of the B phase in the driving motor controller 30, that is, the energy storage of the motor winding inductance is realized through the B phase bridge arm.

[0098] Based on Figure 4 When the circuit structure shown uses the B-phase bridge arm to store energy in the motor winding inductance, the current flows as follows: the positive end of the DC power supply module → the first relay K1 → the A-phase winding of the drive motor 20 → the seventh relay K52 → the C-phase winding of the drive motor 20 → the B-phase winding of the drive motor 20 → the power switch at the lower end of the B-phase bridge arm of the drive motor controller 30 → the negative end of the DC power supply module.

[0099] Optionally, the above two embodiments may be combined, such as Figure 5 As shown, in Figure 4 On the basis of the connection structure shown in the figure, a relay K522 is further added, which provides the possibility of boosting and charging the power battery and storing energy in the motor winding through the C-phase bridge arm. Figure 5 On the basis of the circuit structure shown, if it is necessary to use the B-phase bridge arm to realize boost charging of the power battery and energy storage in the motor winding, the seventh relay K52 can be closed and the relay K522 can be disconnected (the control method of other relays or circuit devices can refer to the control method of using the B-phase bridge arm to realize boost charging of the power battery and energy storage in the motor winding provided in the previous text); if it is necessary to use the C-phase bridge arm to realize boost charging of the power battery and energy storage in the motor winding, the seventh relay K52 can be disconnected and the relay K522 can be closed (the control method of other relays or circuit devices can refer to the control method of using the C-phase bridge arm to realize boost charging of the power battery and energy storage in the motor winding provided in the previous text).

[0100] In this way, the controller 10 can flexibly choose whether to use the B-phase bridge arm or the C-phase bridge arm to achieve boost charging of the power battery and energy storage in the motor winding, which is more applicable and more flexible.

[0101] In another embodiment, if Figure 6 As shown, the switch module 40 may include an eighth relay K43, a ninth relay K53, a tenth relay K63, an eleventh relay K73, a twelfth relay K83, and a thirteenth relay K93.

[0102] The first end of the eighth relay K43 is respectively connected to the positive end of the DC power supply module and the first end of the first relay K1, and the second end of the eighth relay K43 is respectively connected to the first end of the tenth relay K63 and the first end of the third phase winding of the drive motor 20; the first end of the ninth relay K53 is respectively connected to the second end of the first relay K1 and the first end of the first phase winding of the drive motor 20, and the second end of the ninth relay K53 is respectively connected to the second end of the tenth relay K63 and the first end of the second phase winding of the drive motor 20; the first end of the tenth relay K63 is also connected to the first end of the third phase winding The second end of the tenth relay K63 is also connected to the first end of the second phase winding; the first end of the eleventh relay K73 is connected to the first phase lead wire of the drive motor 20, and the second end of the eleventh relay K73 is connected to the second phase lead wire of the drive motor 20; the first end of the twelfth relay K83 is connected to the first phase lead wire of the drive motor 20, and the second end of the twelfth relay K83 is connected to the third phase lead wire of the drive motor 20; the first end of the thirteenth relay K93 is connected to the second phase lead wire of the drive motor 20, and the second end of the thirteenth relay K93 is connected to the third phase lead wire of the drive motor 20.

[0103] The controller 10 is used to control the on and off of the first relay K1, the eighth relay K43, the ninth relay K53, the tenth relay K63, the eleventh relay K73, the twelfth relay K83 and the thirteenth relay K93 so that the three-phase windings in the drive motor 20 are connected in series.

[0104] In this embodiment, by essentially setting the eighth relay K43, the ninth relay K53, the tenth relay K63, the eleventh relay K73, the twelfth relay K83 and the thirteenth relay K93, any one of the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm can be used to realize boost charging of the power battery and energy storage of the motor winding according to actual needs.

[0105] based on Figure 6In the structure shown, in a possible scenario, when the first power switch is the power switch of the upper bridge arm of the first phase in the drive motor controller 30, the controller 10 is used to control the first relay K1, the tenth relay K63, the eleventh relay K73 and the twelfth relay K83 to be disconnected, and control the eighth relay K43, the ninth relay K53 and the thirteenth relay K93 to be turned on, so that the third phase winding, the second phase winding, the first phase winding and the first power switch are connected in series in sequence.

[0106] When the second power switch is the power switch of the lower bridge arm of the first phase, the controller 10 is used to control the first relay K1, the tenth relay K63, the eleventh relay K73 and the twelfth relay K83 to be disconnected, and control the eighth relay K43, the ninth relay K53 and the thirteenth relay K93 to be turned on, so that the third phase winding, the second phase winding, the first phase winding and the second power switch are connected in series in sequence.

[0107] In this scenario, the A-phase bridge arm is selected through the control of the controller 10 to achieve boost charging of the power battery and energy storage in the motor winding.

[0108] In another possible scenario, when the first power switch is the power switch of the upper bridge arm of the second phase in the drive motor controller 30: the controller 10 is used to control the first relay K1, the tenth relay K63, the eleventh relay K73 and the thirteenth relay K93 to be disconnected, and control the eighth relay K43, the ninth relay K53 and the twelfth relay K83 to be turned on, so that the third phase winding, the first phase winding, the second phase winding and the first power switch are connected in series in sequence; or, the controller 10 is used to control the eighth relay K43, the ninth relay K53, the eleventh relay K73 and the thirteenth relay K93 to be disconnected, and control the first relay K1, the tenth relay K63 and the twelfth relay K83 to be turned on, so that the first phase winding, the third phase winding, the second phase winding and the first power switch are connected in series in sequence.

[0109] When the second power switch is the power switch of the lower bridge arm of the second phase: the controller 10 is used to control the first relay K1, the tenth relay K63, the eleventh relay K73 and the thirteenth relay K93 to be disconnected, and control the eighth relay K43, the ninth relay K53 and the twelfth relay K83 to be turned on, so that the third phase winding, the first phase winding, the second phase winding and the second power switch are connected in series in sequence; or, the controller 10 is used to control the eighth relay K43, the ninth relay K53, the eleventh relay K73 and the thirteenth relay K93 to be disconnected, and control the first relay K1, the tenth relay K63 and the twelfth relay K83 to be turned on, so that the first phase winding, the third phase winding, the second phase winding and the second power switch are connected in series in sequence.

[0110] In this scenario, the B-phase bridge arm is selected through the control of the controller 10 to achieve boost charging of the power battery and energy storage in the motor winding.

[0111] In another possible scenario, when the first power switch is the power switch of the upper bridge arm of the third phase in the drive motor controller 30, the controller 10 is used to control the eighth relay K43, the ninth relay K53, the twelfth relay K83 and the thirteenth relay K93 to be disconnected, and control the first relay K1, the tenth relay K63 and the eleventh relay K73 to be turned on, so that the first phase winding, the second phase winding, the third phase winding and the first power switch are connected in series in sequence.

[0112] When the second power switch is the power switch of the lower bridge arm of the third phase, the controller 10 is used to control the eighth relay K43, the ninth relay K53, the twelfth relay K83 and the thirteenth relay K93 to be disconnected, and control the first relay K1, the tenth relay K63 and the eleventh relay K73 to be turned on, so that the first phase winding, the second phase winding, the third phase winding and the second power switch are connected in series in sequence.

[0113] In this scenario, the C-phase bridge arm is selected through the control of the controller 10 to achieve boost charging of the power battery and energy storage in the motor winding.

[0114] Optionally, if each phase winding of the drive motor 20 includes more than one branch winding, the controller 10 is used to control the switch module 40 to connect each branch winding in the drive motor 20 in series.

[0115] In a possible embodiment, Figure 7 As shown, if each phase winding of the drive motor 20 includes two branch windings respectively, the drive motor 20 includes a first branch winding and a second branch winding corresponding to the first phase, a third branch winding and a fourth branch winding corresponding to the second phase, and a fifth branch winding and a sixth branch winding corresponding to the third phase, the first phase lead wire of the drive motor 20 is led out via the first branch winding, the second phase lead wire of the drive motor 20 is led out via the third branch winding, and the third phase lead wire of the drive motor 20 is led out via the sixth branch winding.

[0116] The switch module 40 includes a fourteenth relay K44 , a fifteenth relay K54 , a sixteenth relay K64 , a seventeenth relay K74 , an eighteenth relay K84 , a nineteenth relay K94 , and a twentieth relay K104 .

[0117] The second end of the first relay K1 is respectively connected to the third phase lead wire of the drive motor 20 and the second end of the eighteenth relay K84; the first end of the fourteenth relay K44 is respectively connected to the first ends of the two branch windings of the first phase of the drive motor 20, and the second end of the fourteenth relay K44 is respectively connected to the first ends of the two branch windings of the second phase of the drive motor 20 and the first end of the fifteenth relay K54; the second end of the fifteenth relay K54 is connected to the first ends of the two branch windings of the third phase of the drive motor 20; the first end of the sixteenth relay K64 is connected to the first phase lead wire, and the second end of the sixteenth relay K64 is respectively connected to the drive motor 2 0 and the first end of the nineteenth relay K94; the second end of the nineteenth relay K94 is respectively connected to the second phase lead-out line and the first end of the seventeenth relay K74; the first end of the seventeenth relay K74 is connected to the second phase lead-out line, and the second end of the seventeenth relay K74 is connected to the second end of the fourth branch winding and the first end of the twentieth relay K104; the second end of the twentieth relay K104 is respectively connected to the fifth branch winding and the first end of the eighteenth relay K84; the first end of the eighteenth relay K84 is connected to the second end of the fifth branch winding, and the second end of the eighteenth relay K84 is connected to the third phase lead-out line.

[0118] The controller 10 is used to control the fourteenth relay K44, the fifteenth relay K54, the sixteenth relay K64, the seventeenth relay K74 and the eighteenth relay K84 to be disconnected, and control the nineteenth relay K94 and the twentieth relay K104 to be turned on, so that the branch windings in the drive motor 20 are connected in series.

[0119] exist Figure 7 In the figure, A11 and A12 are used to identify the first branch winding and the second branch winding of phase A, B11 and B12 are used to identify the third branch winding and the fourth branch winding of phase B, and C11 and C12 are used to identify the fifth branch winding and the sixth branch winding of phase C.

[0120] In this embodiment, the A-phase bridge arm is essentially used to boost and charge the power battery (close the power switch at the upper end of the A-phase bridge arm) and store energy in the motor winding (close the power switch at the lower end of the A-phase bridge arm). The method of using the B and C bridge arms can be referred to above and will not be repeated here.

[0121] In addition, this connection concept can be further extended to the situation where each phase winding of the drive motor 20 includes more even-numbered branch windings.

[0122] In a possible embodiment, Figure 8As shown, if each phase winding of the drive motor 20 includes three branch windings respectively, the drive motor 20 includes: a first branch winding, a second branch winding and a third branch winding corresponding to the first phase, a fourth branch winding, a fifth branch winding and a sixth branch winding corresponding to the second phase, and a seventh branch winding, an eighth branch winding and a ninth branch winding corresponding to the third phase. The first phase lead wire of the drive motor 20 is led out via the first branch winding, the second phase lead wire of the drive motor 20 is led out via the fourth branch winding, and the third phase lead wire of the drive motor 20 is led out via the seventh branch winding.

[0123] The switch module 40 includes a twenty-first relay K45 , a twenty-second relay K55 , a twenty-third relay K65 , a twenty-fourth relay K75 , a twenty-fifth relay K85 , a twenty-sixth relay K95 , a twenty-seventh relay K105 , and a twenty-eighth relay K115 .

[0124] The first end of the first relay K1 is respectively connected to the first end of the ninth branch winding of the drive motor 20 and the second end of the twenty-sixth relay K95; the first end of the twenty-first relay K45 is connected to the first phase lead-out line, and the second end of the twenty-first relay K45 is respectively connected to the second end of the second branch winding and the second end of the third branch winding; the first end of the twenty-second relay K55 is respectively connected to the first end of the first branch winding and the first end of the second branch winding, and the second end of the twenty-second relay K55 is respectively connected to the first end of the third branch winding, the first end of the fourth branch winding and the first end of the twenty-third relay K65; the first end of the twenty-third relay K65 is also connected to the first end of the fourth branch winding, and the second end of the twenty-third relay K65 is respectively connected to the first end of the fifth branch winding, the first end of the sixth branch winding and the first end of the twenty-eighth relay K115; the first end of the twenty-fourth relay K75 is respectively connected to the second phase lead-out line and the fifth branch winding, and the second end of the twenty-second relay K55 is respectively connected to the first end of the third branch winding, the first end of the fourth branch winding and the first end of the twenty-third relay K65. The second end of the group, the second end of the twenty-fourth relay K75 is respectively connected to the second end of the sixth branch winding and the first end of the twenty-seventh relay K105; the first end of the twenty-fifth relay K85 is respectively connected to the second end of the twenty-seventh relay K105 and the third phase lead-out line, and the second end of the twenty-fifth relay K85 is respectively connected to the second end of the eighth branch winding and the second end of the ninth branch winding; the first end of the twenty-sixth relay K95 is respectively connected to the first end of the seventh branch winding, the first end of the eighth branch winding and the second end of the twenty-eighth relay K115, and the second end of the twenty-sixth relay K95 is connected to the first end of the ninth branch winding; the first end of the twenty-seventh relay K105 is connected to the second end of the sixth branch winding; the first end of the twenty-eighth relay K115 is connected to the first end of the fifth branch winding and the first end of the sixth branch winding, and the second end of the twenty-eighth relay K115 is connected to the first end of the seventh branch winding and the first end of the eighth branch winding.

[0125] The controller 10 is used to control the twenty-first relay K45, the twenty-second relay K55, the twenty-third relay K65, the twenty-fourth relay K75, the twenty-fifth relay K85, the twenty-sixth relay K95 and the twenty-eighth relay K115 to be disconnected, and control the twenty-seventh relay K105 to be turned on, so that the branch windings in the drive motor 20 are connected in series.

[0126] exist Figure 8 In the figure, A21, A22, and A23 are used to identify the first branch winding, the second branch winding, and the third branch winding of phase A, respectively; B21, B22, and B23 are used to identify the fourth branch winding, the fifth branch winding, and the sixth branch winding of phase B, respectively; C21, C22, and C23 are used to identify the seventh branch winding, the eighth branch winding, and the ninth branch winding of phase C, respectively.

[0127] In this embodiment, the A-phase bridge arm is essentially used to boost and charge the power battery (close the power switch at the upper end of the A-phase bridge arm) and store energy in the motor winding (close the power switch at the lower end of the A-phase bridge arm). The method of using the B and C bridge arms can be referred to above and will not be repeated here.

[0128] In addition, this connection concept can be further extended to the situation where each phase winding of the drive motor 20 includes more odd-numbered branch windings.

[0129] Optionally, the power battery charging system of the present disclosure may further include a first capacitor connected in parallel with the DC power supply module, and a second capacitor connected in parallel with the power battery, for voltage stabilization and rectification.

[0130] The present disclosure also provides a vehicle, comprising a power battery and the power battery charging system described in any embodiment of the present disclosure.

[0131] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0132] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0133] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A power battery charging system, characterized in that: include: A controller (10), a drive motor (20), a drive motor controller (30) connected to the drive motor (20), a switch module (40) including a first relay (K1), a second relay (K2), and a third relay (K3); the switch module (40) further includes at least one relay other than the first relay (K1), the at least one relay being respectively arranged between different windings of the drive motor (20); The first end of the first relay (K1) is connected to the positive end of the DC power supply module, and the second end of the first relay (K1) is connected to the drive motor (20); the first end of the second relay (K2) is connected to the positive end of the DC power supply module, and the second end of the second relay (K2) is connected to the first end of the third relay (K3); the second end of the third relay (K3) is connected to the positive electrode of the power battery; the upper end of the three-phase bridge arm of the drive motor controller (30) is connected to the first end of the third relay (K3), and the lower end of the three-phase bridge arm of the drive motor controller (30) is respectively connected to the negative end of the DC power supply module and the negative electrode of the power battery; The controller (10) is used to control the third relay (K3) and the first power switch to be turned on, and control the second relay (K2) and the power switches other than the first power switch in the drive motor controller (30) to be turned off when a boost charging condition is met, and control the switch module (40) to connect the three-phase winding in the drive motor (20) in series to form a first circuit including the three-phase winding connected in series, the first power switch and the power battery, so that the DC power supply module performs boost charging on the power battery through the first circuit; wherein the first power switch is a power switch at the upper end of one of the three-phase bridge arms of the drive motor controller (30).

2. The power battery charging system according to claim 1, characterized in that: The controller (10) is further used to control the second power switch to be turned on, and to control the second relay (K2), the third relay (K3) and the remaining power switches in the drive motor controller (30) except the second power switch to be turned off, and to control the switch module (40) to connect the three-phase winding in the drive motor (20) in series to form a second circuit including the three-phase winding connected in series and the second power switch, so that the DC power supply module stores energy of the inductance of the three-phase winding of the drive motor (20) through the second circuit; wherein the second power switch is a power switch at the lower end of one of the three-phase bridge arms of the drive motor controller (30).

3. The power battery charging system according to claim 2, characterized in that: The switch module (40) comprises a fourth relay (K41) and a fifth relay (K51); The first end of the fourth relay (K41) is respectively connected to the first end of the first phase winding and the first end of the second phase winding of the drive motor (20), and the second end of the fourth relay (K41) is respectively connected to the second end of the first relay (K1) and the first end of the third phase winding of the drive motor (20); the first end of the fifth relay (K51) is connected to the lead wire of the second end of the third phase winding, and the second end of the fifth relay (K51) is connected to the lead wire of the second end of the second phase winding; When the first power switch is the power switch of the upper bridge arm of the first phase in the drive motor controller (30), the controller (10) is used to control the fourth relay (K41) to be disconnected, and control the first relay (K1) and the fifth relay (K51) to be turned on, so that the third phase winding, the second phase winding, the first phase winding and the first power switch are connected in series in sequence.

4. The power battery charging system according to claim 3, characterized in that: When the second power switch is the power switch of the lower bridge arm of the first phase in the drive motor controller (30), the controller (10) is used to control the fourth relay (K41) to be disconnected, and control the first relay (K1) and the fifth relay (K51) to be turned on, so that the third phase winding, the second phase winding, the first phase winding and the second power switch are connected in series in sequence.

5. The power battery charging system according to claim 2, characterized in that: The switch module (40) comprises a sixth relay (K42) and a seventh relay (K52); The first end of the sixth relay (K42) is respectively connected to the second end of the first relay (K1) and the first end of the first phase winding of the drive motor (20), and the second end of the sixth relay (K42) is respectively connected to the first end of the second phase winding of the drive motor (20) and the first end of the third phase winding; the first end of the seventh relay (K52) is connected to the lead wire of the second end of the first phase winding, and the second end of the seventh relay (K52) is connected to the lead wire of the second end of the third phase winding; When the first power switch is the power switch of the upper bridge arm of the second phase in the drive motor controller (30), the controller (10) is used to control the sixth relay (K42) to be disconnected, and control the first relay (K1) and the seventh relay (K52) to be turned on, so that the first phase winding, the third phase winding, the second phase winding and the first power switch are connected in series in sequence.

6. The power battery charging system according to claim 5, characterized in that: When the second power switch is the power switch of the lower bridge arm of the second phase in the drive motor controller (30), the controller (10) is used to control the sixth relay (K42) to be disconnected, and control the first relay (K1) and the seventh relay (K52) to be turned on, so that the first phase winding, the third phase winding, the second phase winding and the second power switch are connected in series in sequence.

7. The power battery charging system according to claim 2, characterized in that: The switch module (40) comprises an eighth relay (K43), a ninth relay (K53), a tenth relay (K63), an eleventh relay (K73), a twelfth relay (K83) and a thirteenth relay (K93); The first end of the eighth relay (K43) is respectively connected to the positive end of the DC power supply module and the first end of the first relay (K1); the second end of the eighth relay (K43) is respectively connected to the first end of the tenth relay (K63) and the first end of the third phase winding of the drive motor (20); the first end of the ninth relay (K53) is respectively connected to the second end of the first relay (K1) and the first end of the first phase winding of the drive motor (20); the second end of the ninth relay (K53) is respectively connected to the second end of the tenth relay (K63) and the first end of the second phase winding of the drive motor (20); the first end of the tenth relay (K63) is also connected to the first end of the third phase winding. The second end of the tenth relay (K63) is also connected to the first end of the second phase winding; the first end of the eleventh relay (K73) is connected to the first phase lead wire of the drive motor (20), and the second end of the eleventh relay (K73) is connected to the second phase lead wire of the drive motor (20); the first end of the twelfth relay (K83) is connected to the first phase lead wire of the drive motor (20), and the second end of the twelfth relay (K83) is connected to the third phase lead wire of the drive motor (20); the first end of the thirteenth relay (K93) is connected to the second phase lead wire of the drive motor (20), and the second end of the thirteenth relay (K93) is connected to the third phase lead wire of the drive motor (20); The controller (10) is used to control the on and off of the first relay (K1), the eighth relay (K43), the ninth relay (K53), the tenth relay (K63), the eleventh relay (K73), the twelfth relay (K83) and the thirteenth relay (K93), so that the three-phase windings in the drive motor (20) are connected in series.

8. The power battery charging system according to claim 7, characterized in that: When the first power switch is a power switch of an upper bridge arm of a first phase in the drive motor controller (30), the controller (10) is used to control the first relay (K1), the tenth relay (K63), the eleventh relay (K73) and the twelfth relay (K83) to be disconnected, and control the eighth relay (K43), the ninth relay (K53) and the thirteenth relay (K93) to be turned on, so that the third phase winding, the second phase winding, the first phase winding and the first power switch are connected in series in sequence; When the second power switch is the power switch of the lower bridge arm of the first phase, the controller (10) is used to control the first relay (K1), the tenth relay (K63), the eleventh relay (K73) and the twelfth relay (K83) to be disconnected, and control the eighth relay (K43), the ninth relay (K53) and the thirteenth relay (K93) to be turned on, so that the third phase winding, the second phase winding, the first phase winding and the second power switch are connected in series in sequence.

9. The power battery charging system according to claim 7, characterized in that: When the first power switch is the power switch of the upper bridge arm of the second phase in the drive motor controller (30): the controller (10) is used to control the first relay (K1), the tenth relay (K63), the eleventh relay (K73) and the thirteenth relay (K93) to be disconnected, and control the eighth relay (K43), the ninth relay (K53) and the twelfth relay (K83) to be turned on, so that the third phase winding, the first phase winding, the second phase winding and the first power switch are connected in series in sequence; or, the controller (10) is used to control the eighth relay (K43), the ninth relay (K53), the eleventh relay (K73) and the thirteenth relay (K93) to be disconnected, and control the first relay (K1), the tenth relay (K63) and the twelfth relay (K83) to be turned on, so that the first phase winding, the third phase winding, the second phase winding and the first power switch are connected in series in sequence; When the second power switch is the power switch of the lower bridge arm of the second phase: the controller (10) is used to control the first relay (K1), the tenth relay (K63), the eleventh relay (K73) and the thirteenth relay (K93) to be disconnected, and control the eighth relay (K43), the ninth relay (K53) and the twelfth relay (K83) to be turned on, so that the third phase winding, the first phase winding, the second phase winding and the second power switch are connected in series in sequence; or, the controller (10) is used to control the eighth relay (K43), the ninth relay (K53), the eleventh relay (K73) and the thirteenth relay (K93) to be disconnected, and control the first relay (K1), the tenth relay (K63) and the twelfth relay (K83) to be turned on, so that the first phase winding, the third phase winding, the second phase winding and the second power switch are connected in series in sequence.

10. The power battery charging system according to claim 7, characterized in that: When the first power switch is a power switch of an upper bridge arm of a third phase in the drive motor controller (30), the controller (10) is used to control the eighth relay (K43), the ninth relay (K53), the twelfth relay (K83) and the thirteenth relay (K93) to be disconnected, and control the first relay (K1), the tenth relay (K63) and the eleventh relay (K73) to be turned on, so that the first phase winding, the second phase winding, the third phase winding and the first power switch are connected in series in sequence; When the second power switch is the power switch of the lower bridge arm of the third phase, the controller (10) is used to control the eighth relay (K43), the ninth relay (K53), the twelfth relay (K83) and the thirteenth relay (K93) to be disconnected, and control the first relay (K1), the tenth relay (K63) and the eleventh relay (K73) to be turned on, so that the first phase winding, the second phase winding, the third phase winding and the second power switch are connected in series in sequence.

11. The power battery charging system according to claim 2, characterized in that: If each phase winding of the drive motor (20) includes more than one branch winding, the controller (10) is used to control the switch module (40) to connect each branch winding in the drive motor (20) in series.

12. The power battery charging system according to claim 11, characterized in that: If each phase winding of the drive motor (20) comprises two branch windings respectively, the drive motor (20) comprises a first branch winding and a second branch winding corresponding to the first phase, a third branch winding and a fourth branch winding corresponding to the second phase, and a fifth branch winding and a sixth branch winding corresponding to the third phase, a first phase lead wire of the drive motor (20) is led out via the first branch winding, a second phase lead wire of the drive motor (20) is led out via the third branch winding, and a third phase lead wire of the drive motor (20) is led out via the sixth branch winding; The switch module (40) comprises a fourteenth relay (K44), a fifteenth relay (K54), a sixteenth relay (K64), a seventeenth relay (K74), an eighteenth relay (K84), a nineteenth relay (K94) and a twentieth relay (K104); The second end of the first relay (K1) is respectively connected to the third phase lead wire of the drive motor (20) and the second end of the eighteenth relay (K84); the first end of the fourteenth relay (K44) is respectively connected to the first ends of the two branch windings of the first phase of the drive motor (20), and the second end of the fourteenth relay (K44) is respectively connected to the first ends of the two branch windings of the second phase of the drive motor (20) and the first end of the fifteenth relay (K54); the second end of the fifteenth relay (K54) is connected to the first ends of the two branch windings of the third phase of the drive motor (20); the first end of the sixteenth relay (K64) is connected to the first phase lead wire, and the second end of the sixteenth relay (K64) is respectively connected to the first ends of the two branch windings of the second phase of the drive motor (20); 0) and the first end of the nineteenth relay (K94); the second end of the nineteenth relay (K94) is respectively connected to the second phase lead-out line and the first end of the seventeenth relay (K74); the first end of the seventeenth relay (K74) is connected to the second phase lead-out line, and the second end of the seventeenth relay (K74) is connected to the second end of the fourth branch winding and the first end of the twentieth relay (K104); the second end of the twentieth relay (K104) is respectively connected to the fifth branch winding and the first end of the eighteenth relay (K84); the first end of the eighteenth relay (K84) is connected to the second end of the fifth branch winding, and the second end of the eighteenth relay (K84) is connected to the third phase lead-out line; The controller (10) is used to control the fourteenth relay (K44), the fifteenth relay (K54), the sixteenth relay (K64), the seventeenth relay (K74) and the eighteenth relay (K84) to be disconnected, and to control the nineteenth relay (K94) and the twentieth relay (K104) to be turned on, so that the branch windings in the drive motor (20) are connected in series.

13. The power battery charging system according to claim 11, characterized in that: If each phase winding of the drive motor (20) includes three branch windings, the drive motor (20) includes: a first branch winding, a second branch winding and a third branch winding corresponding to the first phase, a fourth branch winding, a fifth branch winding and a sixth branch winding corresponding to the second phase, and a seventh branch winding, an eighth branch winding and a ninth branch winding corresponding to the third phase, a first phase lead wire of the drive motor (20) is led out via the first branch winding, a second phase lead wire of the drive motor (20) is led out via the fourth branch winding, and a third phase lead wire of the drive motor (20) is led out via the seventh branch winding; The switch module (40) comprises a twenty-first relay (K45), a twenty-second relay (K55), a twenty-third relay (K65), a twenty-fourth relay (K75), a twenty-fifth relay (K85), a twenty-sixth relay (K95), a twenty-seventh relay (K105) and a twenty-eighth relay (K115); The first end of the first relay (K1) is respectively connected to the first end of the ninth branch winding of the drive motor (20) and the second end of the twenty-sixth relay (K95); the first end of the twenty-first relay (K45) is connected to the first phase lead wire, and the second end of the twenty-first relay (K45) is respectively connected to the second end of the second branch winding and the second end of the third branch winding; the first end of the twenty-second relay (K55) is respectively connected to the first end of the first branch winding and the first end of the second branch winding, and the second end of the twenty-second relay (K55) is respectively connected to the first end of the third branch winding, the first end of the fourth branch winding and the first end of the twenty-third relay (K65); the first end of the twenty-third relay (K65) is also connected to the first end of the fourth branch winding, and the second end of the twenty-third relay (K65) is respectively connected to the first end of the fifth branch winding, the first end of the sixth branch winding and the first end of the twenty-eighth relay (K115); the first end of the twenty-fourth relay (K75) is respectively connected to the second phase lead wire and the fifth branch winding The second end of the second branch winding of the second fourth relay (K75) is respectively connected to the second end of the sixth branch winding and the first end of the second seventh relay (K105); the first end of the second fifth relay (K85) is respectively connected to the second end of the second seventh relay (K105) and the third phase lead-out line, and the second end of the second fifth relay (K85) is respectively connected to the second end of the eighth branch winding and the second end of the ninth branch winding; the first end of the second sixth relay (K95) is respectively connected to the first end of the seventh branch winding, the first end of the eighth branch winding and the second end of the second eighth relay (K115), and the second end of the second sixth relay (K95) is connected to the first end of the ninth branch winding; the first end of the second seventh relay (K105) is connected to the second end of the sixth branch winding; the first end of the second eighth relay (K115) is connected to the first end of the fifth branch winding and the first end of the sixth branch winding, and the second end of the second eighth relay (K115) is connected to the first end of the seventh branch winding and the first end of the eighth branch winding; The controller (10) is used to control the twenty-first relay (K45), the twenty-second relay (K55), the twenty-third relay (K65), the twenty-fourth relay (K75), the twenty-fifth relay (K85), the twenty-sixth relay (K95) and the twenty-eighth relay (K115) to be disconnected, and to control the twenty-seventh relay (K105) to be turned on, so that the branch windings in the drive motor (20) are connected in series.

14. A vehicle, characterized in that: The invention comprises a power battery and a power battery charging system according to any one of claims 1 to 13.

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