Power battery pack charging power supply system, method and vehicle

Abstract

The present disclosure relates to a power battery pack charging power supply system, method and vehicle. The power battery pack charging power supply system (100) comprises: a power battery pack comprising a first battery module (11) and a second battery module (12) connected in series; a motor controller (20); a motor (30) connected with the motor controller; a first switch (40), a first node (A) between the first battery module and the second battery module is connected with a neutral point (B) of the motor through the first switch (40); a total controller, for controlling the first switch to be closed and controlling the motor controller to charge the non-failed battery module through the motor controller and the motor when only one of the first battery module and the second battery module fails and a charging instruction is received. When some battery modules fail, a loop can be formed by the motor controller and the motor to charge only the non-failed battery modules, thereby solving the problem of vehicle endurance.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of vehicle control, in particular to a power battery pack charging and power supply system, method and vehicle. BACKGROUND

[0002] In the high-voltage system of an electric vehicle, some power battery packs have multiple battery modules connected in series. If some of the battery modules fail or malfunction, the entire power battery pack is usually treated as failing or malfunctioning. SUMMARY

[0003] The purpose of the present disclosure is to provide a power battery pack charging and power supply system, method and vehicle that can improve vehicle driving safety.

[0004] To achieve the above purpose, the present disclosure provides a power battery pack charging and power supply system, comprising:

[0005] a power battery pack comprising a first battery module and a second battery module connected in series;

[0006] a motor controller connected to the power battery pack;

[0007] a motor connected to the motor controller;

[0008] a first switch, a first node between the first battery module and the second battery module being connected to a neutral point of the motor through the first switch;

[0009] a total controller configured to, in the case that only one of the first battery module and the second battery module fails and a charging instruction is received, control the first switch to be closed and control the motor controller to charge the non-failed battery module through the motor controller and the motor.

[0010] Optionally, the charging and power supply system further comprises:

[0011] an alternating current charging module connected to the power battery pack, configured to convert alternating current input from outside into direct current to charge the power battery pack;

[0012] a main positive relay and a main negative relay;

[0013] The motor controller comprises M-phase bridge arms, and the motor comprises M-phase windings, the first ends of the M-phase windings being connected to the midpoints of the M-phase bridge arms one by one, the second ends of the M-phase windings being connected together to form the neutral point, and M≥3.

[0014] The total controller is configured to, in a case that only one of the first battery module and the second battery module is failed and an AC charging instruction is received, control the first switch to be closed, control the main positive relay and the main negative relay to be turned on and off, and control the M-phase bridge arms to be turned on and off, so that the AC charging module charges the non-failed battery module through the M-phase bridge arms and the M-phase windings.

[0015] Optionally, the positive electrode of the first battery module is a positive electrode of the power battery pack, and the negative electrode of the second battery module is a negative electrode of the power battery pack.

[0016] The total controller is configured to:

[0017] In a case that the first battery module is failed, the second battery module is not failed, and an AC charging instruction is received, the total controller is configured to control the first switch to be closed, the main positive relay to be turned off, the main negative relay to be turned on, and at least one upper bridge arm of the M-phase bridge arms to be turned on, so that the AC charging module charges the second battery module through the turned-on upper bridge arm and the corresponding winding.

[0018] In a case that the second battery module is failed, the first battery module is not failed, and an AC charging instruction is received, the total controller is configured to control the first switch to be closed, the main positive relay to be turned on, the main negative relay to be turned off, and at least one lower bridge arm of the M-phase bridge arms to be turned on, so that the AC charging module charges the first battery module through the turned-on lower bridge arm and the corresponding winding.

[0019] Optionally, the charging power supply system further comprises:

[0020] The main positive relay and the main negative relay;

[0021] The DC charging interface comprises a positive electrode interface and a negative electrode interface;

[0022] The second switch, the positive electrode interface is connected to the positive electrode of the power battery pack through the second switch and the main positive relay in sequence;

[0023] The third switch, the negative electrode interface is connected to the negative electrode of the power battery pack through the third switch and the main negative relay in sequence;

[0024] The motor controller comprises M-phase bridge arms, and the motor comprises M-phase windings, a first end of each of the M-phase windings is connected to a midpoint of a corresponding one of the M-phase bridge arms in a one-to-one correspondence, and second ends of the M-phase windings are commonly connected to form a neutral point, and M is greater than or equal to 3.

[0025] The total controller is configured to, in a case that only one of the first battery module and the second battery module is failed and a DC charging instruction is received, control the first switch to be closed, control the main positive relay, the main negative relay, the second switch and the third switch to be turned on and off, and control the M-phase bridge arms to be turned on and off, so that the DC power flowing from the DC charging interface charges the non-failed battery module through the M-phase bridge arms and the M-phase windings.

[0026] Optionally, the positive electrode of the first battery module is the positive electrode of the power battery pack, and the negative electrode of the second battery module is the negative electrode of the power battery pack.

[0027] The total controller is configured to:

[0028] In a case where the first battery module is failed, the second battery module is not failed, and a direct current charging instruction is received, the total controller controls the first switch to be closed, the main positive relay to be opened, the main negative relay to be closed, the second switch and the third switch to be closed, and at least one upper bridge arm of the M-phase bridge arms to be turned on, so that direct current flowing from the direct current charging interface charges the second battery module through the turned-on upper bridge arm and the corresponding winding.

[0029] In a case where the second battery module is failed, the first battery module is not failed, and a direct current charging instruction is received, the total controller controls the first switch to be closed, the main positive relay to be closed, the main negative relay to be opened, the second switch and the third switch to be closed, and at least one lower bridge arm of the M-phase bridge arms to be turned on, so that direct current flowing from the direct current charging interface charges the first battery module through the turned-on lower bridge arm and the corresponding winding.

[0030] Optionally, the charging and power supply system further comprises a main positive relay, a main negative relay, a fifth switch and a sixth switch.

[0031] The first battery module is connected to the fifth switch through the main positive relay, and the other end of the fifth switch is connected to the first node.

[0032] The second battery module is connected to the sixth switch through the main negative relay, and the other end of the sixth switch is connected to the first node.

[0033] The total controller is further configured to, in a case where only one of the first battery module and the second battery module is failed and a power supply instruction is received, control the main positive relay, the main negative relay, the fifth switch and the sixth switch, so that the battery module that is not failed supplies power to the outside.

[0034] Optionally, the total controller is configured to:

[0035] In a case where the first battery module is failed, the second battery module is not failed, and a power supply instruction is received, the total controller controls the main positive relay to be opened, the main negative relay to be closed, the fifth switch to be closed, and the sixth switch to be opened, so that the second battery module supplies power to the outside.

[0036] In a case where the second battery module is failed, the first battery module is not failed, and a power supply instruction is received, the total controller controls the main positive relay to be closed, the main negative relay to be opened, the fifth switch to be opened, and the sixth switch to be closed, so that the first battery module supplies power to the outside.

[0037] The present disclosure further provides a power battery pack charging and power supply method, comprising:

[0038] In the case that only one of the first battery module and the second battery module fails and a charging instruction is received, the first switch is controlled to be closed, and the motor controller is controlled to charge the non-failed battery module through the motor controller and the motor.

[0039] The power battery pack includes a first battery module and a second battery module connected in series; the motor controller is connected with the power battery pack; the motor is connected with the motor controller; a first node between the first battery module and the second battery module is connected with a neutral point of the motor through a first switch.

[0040] Optionally, the motor controller includes M-phase bridge arms, and the motor includes M-phase windings; first ends of the M-phase windings are connected to the midpoints of the M-phase bridge arms in one-to-one correspondence, and second ends of the M-phase windings are connected to form the neutral point; M is greater than or equal to 3; an alternating current charging module is connected with the power battery pack, and the alternating current charging module is configured to convert alternating current input from outside into direct current to charge the power battery pack.

[0041] In the case that only one of the first battery module and the second battery module fails and a charging instruction is received, the first switch is controlled to be closed, and the motor controller is controlled to charge the non-failed battery module through the motor controller and the motor, including:

[0042] In the case that only one of the first battery module and the second battery module fails and an alternating current charging instruction is received, the first switch is controlled to be closed, the on-off of the main positive relay and the main negative relay is controlled, and the on-off of the M-phase bridge arms is controlled, so that the alternating current charging module charges the non-failed battery module through the M-phase bridge arms and the M-phase windings.

[0043] Optionally, the positive electrode of the first battery module is the positive electrode of the power battery pack, and the negative electrode of the second battery module is the negative electrode of the power battery pack.

[0044] In the case that only one of the first battery module and the second battery module fails and an alternating current charging instruction is received, the first switch is controlled to be closed, the on-off of the main positive relay and the main negative relay is controlled, and the on-off of the M-phase bridge arms is controlled, so that the alternating current charging module charges the non-failed battery module through the M-phase bridge arms and the M-phase windings.

[0045] In the case that only one of the first battery module and the second battery module fails and an alternating current charging instruction is received, the first switch is controlled to be closed, the on-off of the main positive relay and the main negative relay is controlled, and the on-off of the M-phase bridge arms is controlled, so that the alternating current charging module charges the non-failed battery module through the M-phase bridge arms and the M-phase windings.

[0046] In a case that the first battery module is failed, the second battery module is not failed, and the AC charging instruction is received, the first switch is controlled to be closed, the main positive relay is controlled to be closed, the main negative relay is controlled to be opened, and at least one upper bridge arm of the M-phase bridge arms is controlled to be turned on, so that the AC charging module charges the first battery module through the turned-on upper bridge arm and the corresponding winding.

[0047] Optionally, the motor controller comprises M-phase bridge arms, and the motor comprises M-phase windings, wherein the first ends of the M-phase windings are connected to the midpoints of the M-phase bridge arms in one-to-one correspondence, the second ends of the M-phase windings are connected to form a neutral point, and M is greater than or equal to 3.

[0048] The DC charging interface comprises a positive electrode interface and a negative electrode interface; the positive electrode interface is connected to the positive electrode of the power battery pack through the second switch and the main positive relay in sequence; and the negative electrode interface is connected to the negative electrode of the power battery pack through the third switch and the main negative relay in sequence.

[0049] The method further comprises:

[0050] In a case that only one of the first battery module and the second battery module is failed and the DC charging instruction is received, the first switch is controlled to be closed, the main positive relay, the main negative relay, the second switch and the third switch are controlled to be turned on and turned off, and the M-phase bridge arms are controlled to be turned on and turned off, so that the DC power flowing from the DC charging interface charges the unfailed battery module through the M-phase bridge arms and the M-phase windings.

[0051] Optionally, the positive electrode of the first battery module is the positive electrode of the power battery pack, and the negative electrode of the second battery module is the negative electrode of the power battery pack.

[0052] In a case that only one of the first battery module and the second battery module is failed and the DC charging instruction is received, the first switch is controlled to be closed, the main positive relay, the main negative relay, the second switch and the third switch are controlled to be turned on and turned off, and the M-phase bridge arms are controlled to be turned on and turned off, so that the DC power flowing from the DC charging interface charges the unfailed battery module through the M-phase bridge arms and the M-phase windings, comprising:

[0053] In a case that the first battery module is failed, the second battery module is not failed, and the DC charging instruction is received, the first switch is controlled to be closed, the main positive relay is controlled to be opened, the main negative relay is controlled to be closed, the second switch and the third switch are controlled to be closed, and at least one upper bridge arm of the M-phase bridge arms is controlled to be turned on, so that the DC power flowing from the DC charging interface charges the second battery module through the turned-on upper bridge arm and the corresponding winding.

[0054] In a case that the first battery module is failed, the second battery module is not failed, and a direct current charging instruction is received, the first switch is controlled to be closed, the main positive relay is controlled to be closed, the main negative relay is controlled to be opened, the second switch and the third switch are controlled to be closed, and at least one lower bridge arm of the M-phase bridge arm is controlled to be turned on, so that the direct current flowing from the direct current charging interface charges the first battery module through the turned-on lower bridge arm and the corresponding winding.

[0055] Optionally, the first battery module is connected to one end of the fifth switch through the main positive relay, and the other end of the fifth switch is connected to the first node; the second battery module is connected to one end of the sixth switch through the main negative relay, and the other end of the sixth switch is connected to the first node.

[0056] The method further includes:

[0057] In a case that only one of the first battery module and the second battery module is failed and a power supply instruction is received, the main positive relay, the main negative relay, the fifth switch and the sixth switch are controlled to supply power to the outside by the unfailed battery module.

[0058] Optionally, in a case that only one of the first battery module and the second battery module is failed and a power supply instruction is received, the main positive relay, the main negative relay, the fifth switch and the sixth switch are controlled to supply power to the outside by the unfailed battery module, including:

[0059] In a case that the first battery module is failed, the second battery module is not failed, and a power supply instruction is received, the main positive relay is controlled to be opened, the main negative relay is controlled to be closed, the fifth switch is controlled to be closed, and the sixth switch is controlled to be opened, so that the second battery module supplies power to the outside.

[0060] In a case that the second battery module is failed, the first battery module is not failed, and a power supply instruction is received, the main positive relay is controlled to be closed, the main negative relay is controlled to be opened, the fifth switch is controlled to be opened, and the sixth switch is controlled to be closed, so that the first battery module supplies power to the outside.

[0061] The present disclosure further provides a vehicle including the above-mentioned power battery pack charging and power supply system.

[0062] By the above technical solution, the power battery pack includes the first battery module and the second battery module connected in series. The first node between the first battery module and the second battery module is connected to the neutral point of the motor through the first switch. In a case that only one of the first battery module and the second battery module is failed and a charging instruction is received, the first switch is controlled to be closed, and the motor controller is controlled to charge the unfailed battery module through the motor controller and the motor. In this way, when part of the battery modules is failed, a loop can be formed by the motor controller and the motor to charge only the unfailed part of the battery modules, thereby solving the problem of the vehicle's endurance.

[0063] Other features and advantages of the present disclosure will be made apparent in the following detailed description of the specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0064] The accompanying drawings are included to provide a further understanding of the present disclosure and constitute a part of the specification, illustrate embodiments of the present disclosure and together with the detailed description help to explain the present disclosure, but do not limit the present disclosure. In the drawings:

[0065] Figure 1 is a circuit schematic diagram of a power battery pack charging power supply system provided by an exemplary embodiment.

[0066] Figure 2 is a circuit schematic diagram of a power battery pack charging power supply system provided by another exemplary embodiment.

[0067] Figure 3 is a current flow schematic diagram of AC charging when a first battery module fails provided by an exemplary embodiment.

[0068] Figure 4 is a current flow schematic diagram of AC charging when a second battery module fails provided by an exemplary embodiment.

[0069] Figure 5 is a circuit schematic diagram of a power battery pack charging power supply system provided by yet another exemplary embodiment.

[0070] Figure 6 is a current flow schematic diagram of DC charging when a first battery module fails provided by an exemplary embodiment.

[0071] Figure 7 is a current flow schematic diagram of DC charging when a second battery module fails provided by an exemplary embodiment.

[0072] Figure 8 is a circuit schematic diagram of a power battery pack charging power supply system provided by yet another exemplary embodiment.

[0073] Figure 9 is a current flow schematic diagram of power battery pack power supply when a first battery module fails provided by an exemplary embodiment.

[0074] Figure 10 is a current flow schematic diagram of power battery pack power supply when a second battery module fails provided by an exemplary embodiment.

[0075] Figure 11 is a flowchart of a power battery pack charging power supply method provided by an exemplary embodiment. DETAILED DESCRIPTION

[0076] The specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended for illustration and explanation of the present disclosure and are not intended to limit the present disclosure.

[0077] Figure 1 is a circuit schematic diagram of a power battery pack charging power supply system provided by an example embodiment. As shown in Figure 1 , the power battery pack charging power supply system 100 can include a power battery pack, a motor controller 20, a motor 30, a first switch 40, and a general controller (not shown).

[0078] The power battery pack includes a first battery module 11 and a second battery module 12 connected in series. The motor controller 20 is connected with the power battery pack. The motor 30 is connected with the motor controller 20. A first node A between the first battery module 11 and the second battery module 12 is connected with a neutral point B of the motor 30 through the first switch 40.

[0079] The general controller is configured to, in a case where only one of the first battery module 11 and the second battery module 12 fails and a charging instruction is received, control the first switch 40 to be closed, and control the motor controller 20 to charge the battery module that does not fail through the motor controller 20 and the motor 30.

[0080] The first battery module 11 and the second battery module 12 can be two battery modules or two separate battery packs.

[0081] In Figure 1 , the motor 30 is exemplarily shown as a motor with three-phase windings. The motor controller 20 correspondingly includes three-phase bridge arms. The motor 30, the motor controller 20, and the power battery pack can be connected according to related technologies. The first switch 40 can be an electronic switching device such as a relay, a switching tube (e.g., a triode, a field effect tube), etc.

[0082] The charging instruction is an instruction for instructing the power battery pack to be charged. For example, when a user inserts a charging gun into a charging port of a vehicle, a charging instruction can be automatically triggered.

[0083] In related technologies, when a part of the power battery pack connected in series fails or malfunctions, since the other part that does not fail is connected in series with the failed part, the part that does not fail cannot provide power to the high-voltage system and cannot play its role, and since multiple parts are connected in series, when a part fails, the failed part is equivalent to a circuit breaker, at this time, the part that does not fail cannot be charged either.

[0084] In the circuit structure of the present disclosure, the first node A between the first battery module 11 and the second battery module 12 is connected to the neutral point B of the motor 30 through the first switch 40, and the non-failed semi-pack battery can be charged by using the connection line between the first node A and the neutral point B, the motor and the motor controller.

[0085] By the above technical solution, the power battery pack includes a first battery module and a second battery module connected in series. The first node between the first battery module and the second battery module is connected to the neutral point of the motor through the first switch. In the case that only one of the first battery module and the second battery module fails and receives a charging instruction, the first switch is controlled to be closed, and the motor controller is controlled to charge the non-failed battery module through the motor controller and the motor. In this way, when part of the battery modules fail, a loop can be formed by using the motor controller and the motor to charge only the non-failed part of the battery modules, thereby solving the problem of vehicle endurance.

[0086] Figure 2 is another example embodiment of the circuit schematic diagram of the power battery pack charging and power supply system provided by the present disclosure. As Figure 2 shown, the charging and power supply system 100 further includes an alternating current charging module 50, a main positive relay K1 and a main negative relay K2. The alternating current charging module 50 is connected to the power battery pack, and is used to convert the external input alternating current into direct current to charge the power battery pack.

[0087] In the embodiment, the motor controller 20 includes M-phase bridge arms, and the motor 30 includes M-phase windings. The first end of the M-phase windings is connected to the midpoint of the M-phase bridge arms one by one, the second end of the M-phase windings is commonly connected to form the neutral point B, and M≥3. Figure 2 In the embodiment, M=3.

[0088] The total controller is used to control the first switch 40 to be closed, control the on-off of the main positive relay K1 and the main negative relay K2, and control the on-off of the M-phase bridge arms, so that the alternating current charging module 50 charges the non-failed battery module through the M-phase bridge arms and the M-phase windings, in the case that only one of the first battery module 11 and the second battery module 12 fails and receives an alternating current charging instruction.

[0089] The alternating current charging instruction is an instruction for indicating that the power battery pack is charged by using external alternating current. For example, when the user inserts the charging gun of the alternating current charging pile into the alternating current charging port of the vehicle, the generation of the alternating current charging instruction can be triggered automatically.

[0090] The AC charging module 50 can be an on-board charger (OBC). The main positive relay K1 and the main negative relay K2 can be connected to the positive terminal and the negative terminal of the power battery pack respectively according to the connection method in the related art. The AC charging module 50 can also be connected according to the connection method in the related art, as shown in Figure 2

[0091] In this embodiment, the external AC power is converted into DC power by the AC charging module 50. When charging the power battery pack, the charging circuit can be formed by controlling the conduction and turn-off of the main positive relay K1, the main negative relay K2, the first switch 40 and the M-phase bridge arms, the failed battery module is isolated, and the non-failed battery module is charged.

[0092] In yet another embodiment, the positive terminal of the first battery module 11 is the positive terminal of the power battery pack, and the negative terminal of the second battery module 12 is the negative terminal of the power battery pack.

[0093] The total controller is configured to: in the case that the first battery module 11 fails, the second battery module 12 does not fail, and an AC charging instruction is received, control the first switch 40 to be closed, the main positive relay K1 to be turned off, the main negative relay K2 to be closed, and at least one upper bridge arm of the M-phase bridge arms to be turned on, so that the AC charging module 50 charges the second battery module 12 through the turned-on upper bridge arm and the corresponding winding.

[0094] Figure 3 is a schematic diagram of the current flow when the first battery module fails and AC charging is performed according to an example embodiment. As shown in Figure 3 When the first battery module 11 fails and the second battery module 12 does not fail, the upper bridge arm of the middle bridge arm of the motor controller 20 is turned on, and then the current output by the AC charging module 50 forms a loop in the direction indicated by the arrow to charge the second battery module 12.

[0095] In other embodiments, the upper bridge arm of one or more other phase bridge arms of the three-phase bridge arms of the motor controller 20 can also be turned on to charge the second battery module 12.

[0096] In yet another embodiment, the total controller is configured to: in the case that the second battery module 12 fails, the first battery module 11 does not fail, and an AC charging instruction is received, control the first switch 40 to be closed, the main positive relay K1 to be closed, the main negative relay K2 to be turned off, and at least one lower bridge arm of the M-phase bridge arms to be turned on, so that the AC charging module 50 charges the first battery module 11 through the turned-on lower bridge arm and the corresponding winding.

[0097] Figure 4 ​is a schematic diagram of current flow when AC charging is performed when the second battery module fails in an example embodiment. As shown in Figure 4 when the second battery module 12 fails and the first battery module 11 does not fail, the lower bridge arm of the middle bridge arm of the motor controller 20 is turned on, and the current output by the AC charging module 50 forms a loop in the direction indicated by the arrow to charge the second battery module 12.

[0098] In Figure 3 and Figure 4 embodiments, the charging and power supply system 100 further includes a first capacitor C1. The first capacitor C1 is arranged between the positive and negative bus bars of the power battery pack and is used for voltage stabilization.

[0099] In other embodiments, the upper bridge arm of one or more of the three-phase bridge arms of the motor controller 20 can also be turned on to charge the first battery module 11.

[0100] In other embodiments, the charging and power supply system 100 can also use external DC power to charge the battery module that does not fail. Figure 5 is a circuit schematic diagram of a charging and power supply system of a power battery pack according to another example embodiment. As shown in Figure 5 The charging and power supply system 100 further includes a DC charging interface 60, a second switch 70, a third switch 80, a main positive relay K1, and a main negative relay K2.

[0101] The DC charging interface 60 includes a positive interface and a negative interface; the positive interface is connected to the positive terminal of the power battery pack through the second switch 70 and the main positive relay K1 in sequence; and the negative interface is connected to the negative terminal of the power battery pack through the third switch 80 and the main negative relay K2 in sequence.

[0102] The main positive relay K1 and the main negative relay K2, the motor controller 20 includes M-phase bridge arms, and the motor 30 includes M-phase windings; the first ends of the M-phase windings are connected to the midpoints of the M-phase bridge arms in one-to-one correspondence, the second ends of the M-phase windings are commonly connected to form a neutral point B, and M≥3. In Figure 5 In the embodiment, M=3.

[0103] The total controller is configured to, in the case where only one of the first battery module 11 and the second battery module 12 fails and a DC charging instruction is received, control the first switch 40 to be closed, control the main positive relay K1, the main negative relay K2, the second switch 70, and the third switch 80 to be turned on and off, and control the M-phase bridge arms to be turned on and off, so that the DC power flowing from the DC charging interface 60 charges the battery module that does not fail through the M-phase bridge arms and the M-phase windings.

[0104] The direct current charging instruction is an instruction for instructing to charge the power battery pack by using external direct current. For example, when the user inserts the charging gun of the direct current charging pile into the direct current charging interface 60 of the vehicle, the generation of the direct current charging instruction can be triggered automatically.

[0105] In this embodiment, when the power battery pack is charged by using direct current, the charging circuit can be formed by controlling the conduction and turn-off of the main positive relay K1, the main negative relay K2, the first switch 40, and the M-phase bridge arms, the failed battery module is isolated, and the non-failed battery module is charged. Figure 5 In the embodiment, the charging power supply system 100 further includes a fourth switch 90 and a second capacitor C2. The positive interface of the direct current charging interface 60 is connected to the neutral point B of the motor through the fourth switch 90. The second capacitor C2 is arranged between the positive interface of the direct current charging interface 60 and the negative bus, and is used for voltage stabilization.

[0106] In yet another embodiment, the positive electrode of the first battery module 11 is the positive electrode of the power battery pack, and the negative electrode of the second battery module 12 is the negative electrode of the power battery pack.

[0107] The total controller is configured to: in the case that the first battery module 11 fails, the second battery module 12 does not fail, and the direct current charging instruction is received, control the first switch 40 to be closed, the main positive relay K1 to be disconnected, the main negative relay K2 to be closed, the second switch 70 and the third switch 80 to be closed, and at least one upper bridge arm of the M-phase bridge arms to be conducted, so that the direct current flowing from the direct current charging interface 60 charges the second battery module 12 through the conducted upper bridge arm and the corresponding winding.

[0108] Figure 6 FIG. 4 is a schematic diagram of the current flow when the first battery module fails and direct current charging is performed according to an example embodiment. As shown in FIG. 4, when the first battery module 11 fails and the second battery module 12 does not fail, the upper bridge arm of the middle bridge arm of the motor controller 20 is controlled to be conducted, and then the current flowing from the direct current charging interface 60 forms a loop in the direction indicated by the arrow to charge the second battery module 12. Figure 6

[0109] In other embodiments, the upper bridge arm of one or more other phase bridge arms of the three-phase bridge arms of the motor controller 20 can also be conducted to charge the second battery module 12.

[0110] ​In yet another embodiment, the total controller is configured to: in the case that the second battery module 12 is failed, the first battery module 11 is not failed, and a direct current charging instruction is received, control the first switch 40 to be closed, the main positive relay K1 to be closed, the main negative relay K2 to be opened, the second switch 70 and the third switch 80 to be closed, and at least one phase bridge arm of the M-phase bridge arms to be turned on, so that the direct current flowing from the direct current charging interface 60 charges the first battery module 11 through the turned-on lower bridge arm and the corresponding winding.

[0111] Figure 7 is a schematic diagram of the current flow when the second battery module is failed and direct current charging is performed according to an example embodiment. As shown in Figure 7 when the second battery module 12 is failed and the first battery module 11 is not failed, the lower bridge arm of the middle bridge arm of the motor controller 20 is turned on, then the current flowing from the direct current charging interface 60 forms a loop in the direction indicated by the arrow, and charges the first battery module 11.

[0112] In other embodiments, the lower bridge arm of one or more other phase bridge arms of the three-phase bridge arms of the motor controller 20 can also be turned on to charge the first battery module 11.

[0113] The power battery pack charging and power supply system of the present disclosure can also isolate the failed battery module and supply power to the non-failed battery module.

[0114] Figure 8 is a circuit schematic diagram of the power battery pack charging and power supply system according to yet another example embodiment. As shown in Figure 8 The charging and power supply system 100 further includes a main positive relay K1, a main negative relay K2, a fifth switch K3, and a sixth switch K4.

[0115] The first battery module 11 is connected to the fifth switch K3 through the main positive relay K1, and the other end of the fifth switch K3 is connected to the first node A.

[0116] The second battery module 12 is connected to the sixth switch K4 through the main negative relay K2, and the other end of the sixth switch K4 is connected to the first node A.

[0117] The total controller is further configured to, in the case that only one of the first battery module 11 and the second battery module 12 is failed and a power supply instruction is received, control the main positive relay K1, the main negative relay K2, the fifth switch K3, and the sixth switch K4, so that the non-failed battery module supplies power to the outside.

[0118] The power supply instruction can be, for example, a user-triggered instruction to start the vehicle. By controlling the conduction and shutdown of the main positive relay K1, the main negative relay K2, the fifth switch K3 and the sixth switch K4, the failed battery module can be isolated, and only the non-failed battery module is used to supply power to the outside. In this way, when only part of the battery modules in the power battery pack fails, the failed part can be isolated, and the non-failed part can be used to continue to supply power to the high-voltage load. When the voltages of the first battery module 11 and the second battery module 12 are equal, the voltage of half of the power battery pack is provided to the high-voltage system to supply power, ensuring that the high-voltage load continues to work, and the motor can continue to drive, improving the safety of vehicle travel.

[0119] In an embodiment, the total controller is configured to, in a case where the first battery module 11 fails, the second battery module 12 does not fail, and a power supply instruction is received, control the main positive relay K1 to be open, the main negative relay K2 to be closed, the fifth switch K3 to be closed, and the sixth switch K4 to be open, so that the second battery module 12 supplies power to the outside.

[0120] Figure 9 FIG. 1 is a schematic diagram of the current flow direction when the first battery module fails and the power battery pack supplies power according to an example embodiment. As shown in FIG. 1, when the first battery module 11 fails and the second battery module 12 does not fail, the main positive relay K1 is controlled to be open, the main negative relay K2 is controlled to be closed, the fifth switch K3 is controlled to be closed, and the sixth switch K4 is controlled to be open. In this way, the current output by the second battery module 12 is supplied to the load in the direction indicated by the arrow in FIG. 1. Figure 9 Figure 9

[0121] In an embodiment, the total controller is configured to, in a case where the second battery module 12 fails, the first battery module 11 does not fail, and a power supply instruction is received, control the main positive relay K1 to be closed, the main negative relay K2 to be open, the fifth switch K3 to be open, and the sixth switch K4 to be closed, so that the first battery module 11 supplies power to the outside.

[0122] Figure 10 FIG. 2 is a schematic diagram of the current flow direction when the second battery module fails and the power battery pack supplies power according to an example embodiment. As shown in FIG. 2, when the second battery module 12 fails and the first battery module 11 does not fail, the main positive relay K1 is controlled to be closed, the main negative relay K2 is controlled to be open, the fifth switch K3 is controlled to be open, and the sixth switch K4 is controlled to be closed. In this way, the current output by the first battery module 11 is supplied to the load in the direction indicated by the arrow in FIG. 2. Figure 10 Figure 10

[0123] The present disclosure also provides a power battery pack charging and power supply method. Figure 11 FIG. 3 is a flowchart of the power battery pack charging and power supply method according to an example embodiment. As shown in FIG. 3, the power battery pack charging and power supply method includes the following steps.​​​​Figure 11 As shown, the method comprises the following steps: in the case that only one of the first battery module 11 and the second battery module 12 is failed and a charging instruction is received, the first switch 40 is controlled to be closed, and the motor controller 20 is controlled to charge the non-failed battery module through the motor controller 20 and the motor 30.

[0124] The power battery pack comprises a first battery module 11 and a second battery module 12 connected in series; the motor controller 20 is connected with the power battery pack; the motor 30 is connected with the motor controller 20; the first node A between the first battery module 11 and the second battery module 12 is connected with the neutral point B of the motor 30 through the first switch 40.

[0125] Optionally, the motor controller 20 comprises M-phase bridge arms, the motor 30 comprises M-phase windings, the first ends of the M-phase windings are connected to the midpoints of the M-phase bridge arms one by one in a one-to-one correspondence, the second ends of the M-phase windings are connected in common to form the neutral point B, M≥3, the AC charging module 50 is connected with the power battery pack, and the AC charging module 50 is used to convert AC power input from outside into DC power to charge the power battery pack;

[0126] In the case that only one of the first battery module 11 and the second battery module 12 is failed and a charging instruction is received, the first switch 40 is controlled to be closed, and the motor controller 20 is controlled to charge the non-failed battery module through the motor controller 20 and the motor 30, comprising:

[0127] In the case that only one of the first battery module 11 and the second battery module 12 is failed and an AC charging instruction is received, the first switch 40 is controlled to be closed, the on-off of the main positive relay K1 and the main negative relay K2 is controlled, and the on-off of the M-phase bridge arms is controlled, so that the AC charging module 50 charges the non-failed battery module through the M-phase bridge arms and the M-phase windings.

[0128] Optionally, the positive electrode of the first battery module 11 is the positive electrode of the power battery pack, and the negative electrode of the second battery module 12 is the negative electrode of the power battery pack.

[0129] In the case that only one of the first battery module 11 and the second battery module 12 is failed and an AC charging instruction is received, the first switch 40 is controlled to be closed, the on-off of the main positive relay K1 and the main negative relay K2 is controlled, and the on-off of the M-phase bridge arms is controlled, so that the AC charging module 50 charges the non-failed battery module through the M-phase bridge arms and the M-phase windings.

[0130] In the case that the first battery module 11 fails, the second battery module 12 does not fail, and an alternating current charging instruction is received, the first switch 40 is controlled to be closed, the main positive relay K1 is controlled to be opened, the main negative relay K2 is controlled to be closed, and at least one upper bridge arm of the M-phase bridge arm is controlled to be turned on, so that the alternating current charging module 50 charges the second battery module 12 through the turned-on upper bridge arm and the corresponding winding.

[0131] In the case that the second battery module 12 fails, the first battery module 11 does not fail, and an alternating current charging instruction is received, the first switch 40 is controlled to be closed, the main positive relay K1 is controlled to be closed, the main negative relay K2 is controlled to be opened, and at least one lower bridge arm of the M-phase bridge arm is controlled to be turned on, so that the alternating current charging module 50 charges the first battery module 11 through the turned-on lower bridge arm and the corresponding winding.

[0132] Optionally, the motor controller 20 comprises an M-phase bridge arm, and the motor 30 comprises an M-phase winding, a first end of the M-phase winding is connected to a midpoint of the M-phase bridge arm in a one-to-one correspondence, a second end of the M-phase winding is commonly connected to form a neutral point B, and M≥3.

[0133] The direct current charging interface 60 comprises a positive electrode interface and a negative electrode interface; the positive electrode interface is connected to the positive electrode of the power battery pack in sequence through the second switch 70, the main positive relay K1, and the negative electrode interface is connected to the negative electrode of the power battery pack through the third switch 80, the main negative relay K2.

[0134] The method further comprises:

[0135] In the case that only one of the first battery module 11 and the second battery module 12 fails, and a direct current charging instruction is received, the first switch 40 is controlled to be closed, the main positive relay K1, the main negative relay K2, the second switch 70, and the third switch 80 are controlled to be turned on and turned off, and the M-phase bridge arm is controlled to be turned on and turned off, so that the direct current flowing from the direct current charging interface 60 charges the non-failed battery module through the M-phase bridge arm and the M-phase winding.

[0136] Optionally, the positive electrode of the first battery module 11 is the positive electrode of the power battery pack, and the negative electrode of the second battery module 12 is the negative electrode of the power battery pack.

[0137] In the case that only one of the first battery module 11 and the second battery module 12 fails, and a direct current charging instruction is received, the first switch 40 is controlled to be closed, the main positive relay K1, the main negative relay K2, the second switch 70, and the third switch 80 are controlled to be turned on and turned off, and the M-phase bridge arm is controlled to be turned on and turned off, so that the direct current flowing from the direct current charging interface 60 charges the non-failed battery module through the M-phase bridge arm and the M-phase winding, comprising:

[0138] In the case that the first battery module 11 fails, the second battery module 12 does not fail, and a direct current charging instruction is received, the first switch 40 is controlled to be closed, the main positive relay K1 is controlled to be disconnected, the main negative relay K2 is controlled to be closed, the second switch 70 and the third switch 80 are controlled to be closed, and at least one upper bridge arm of the M-phase bridge arm is controlled to be turned on, so that the direct current flowing from the direct current charging interface 60 charges the second battery module 12 through the turned-on upper bridge arm and the corresponding winding.

[0139] In the case that the second battery module 12 fails, the first battery module 11 does not fail, and a direct current charging instruction is received, the first switch 40 is controlled to be closed, the main positive relay K1 is controlled to be closed, the main negative relay K2 is controlled to be disconnected, the second switch 70 and the third switch 80 are controlled to be closed, and at least one lower bridge arm of the M-phase bridge arm is controlled to be turned on, so that the direct current flowing from the direct current charging interface 60 charges the first battery module 11 through the turned-on lower bridge arm and the corresponding winding.

[0140] Optionally, the first battery module 11 is connected to one end of the fifth switch K3 through the main positive relay K1, and the other end of the fifth switch K3 is connected to the first node A; the second battery module 12 is connected to one end of the sixth switch K4 through the main negative relay K2, and the other end of the sixth switch K4 is connected to the first node A.

[0141] The method further comprises:

[0142] In the case that only one of the first battery module 11 and the second battery module 12 fails, and a power supply instruction is received, the main positive relay K1, the main negative relay K2, the fifth switch K3, and the sixth switch K4 are controlled to supply power to the outside by the battery module that does not fail.

[0143] Optionally, in the case that only one of the first battery module 11 and the second battery module 12 fails, and a power supply instruction is received, the main positive relay K1, the main negative relay K2, the fifth switch K3, and the sixth switch K4 are controlled to supply power to the outside by the battery module that does not fail, comprising:

[0144] In the case that the first battery module 11 fails, the second battery module 12 does not fail, and a power supply instruction is received, the main positive relay K1 is controlled to be disconnected, the main negative relay K2 is controlled to be closed, the fifth switch K3 is controlled to be closed, and the sixth switch K4 is controlled to be disconnected, so that the second battery module 12 supplies power to the outside;

[0145] In the case that the second battery module 12 fails, the first battery module 11 does not fail, and a power supply instruction is received, the main positive relay K1 is controlled to be closed, the main negative relay K2 is controlled to be disconnected, the fifth switch K3 is controlled to be disconnected, and the sixth switch K4 is controlled to be closed, so that the first battery module 11 supplies power to the outside.

[0146] The present disclosure also provides a vehicle comprising the charging power supply system 100 provided by the present disclosure.

[0147] The preferred embodiments of the present disclosure are described in detail above with reference to the drawings, but the present disclosure is not limited to the specific details in the above-described embodiments. Various simple modifications can be made to the technical solutions of the present disclosure within the technical concept of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

[0148] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, various possible combinations are not described again in the present disclosure.

[0149] In addition, various different embodiments of the present disclosure can also be combined in any appropriate manner, as long as they do not deviate from the idea of the present disclosure, and they should also be considered as disclosed by the present disclosure.

Claims

1. A power battery pack charging and power supply system (100), characterized in that, include: The power battery pack includes a first battery module (11) and a second battery module (12) connected in series. The motor controller (20) is connected to the power battery pack; The motor (30) is connected to the motor controller (20); The first switch (40) connects the first node (A) between the first battery module (11) and the second battery module (12) to the neutral point (B) of the motor (30). The main controller is used to control the first switch (40) to close and control the motor controller (20) to charge the non-failed battery module through the motor controller (20) and the motor (30) when only one of the first battery module (11) and the second battery module (12) fails and a charging command is received.

2. The charging power supply system (100) according to claim 1, characterized in that, The charging power supply system (100) also includes: An AC charging module (50) is connected to the power battery pack and is used to convert external AC power into DC power to charge the power battery pack. Main positive relay (K1) and main negative relay (K2); The motor controller (20) includes an M-phase bridge arm, the motor (30) includes an M-phase winding, the first end of the M-phase winding is connected to the midpoint of the M-phase bridge arm, and the second end of the M-phase winding is connected to form the neutral point (B), M≥3; The main controller is used to control the first switch (40) to close, control the on / off state of the main positive relay (K1) and the main negative relay (K2), and control the on / off state of the M-phase bridge arm when only one of the first battery module (11) and the second battery module (12) fails and an AC charging command is received, so that the AC charging module (50) can charge the unfailed battery module through the M-phase bridge arm and the M-phase winding.

3. The charging power supply system (100) according to claim 2, characterized in that, The positive electrode of the first battery module (11) is the positive electrode of the power battery pack, and the negative electrode of the second battery module (12) is the negative electrode of the power battery pack; The main controller is used for: When the first battery module (11) fails, the second battery module (12) does not fail, and the AC charging command is received, the first switch (40) is controlled to close, the main positive relay (K1) is opened, the main negative relay (K2) is closed, and the upper bridge arm of at least one phase bridge arm in the M phase bridge arm is controlled to be turned on, so that the AC charging module (50) charges the second battery module (12) through the turned-on upper bridge arm and the corresponding winding; If the second battery module (12) fails but the first battery module (11) does not fail, and the AC charging command is received, the first switch (40) is controlled to close, the main positive relay (K1) is closed, the main negative relay (K2) is opened, and the lower bridge arm of at least one phase bridge arm in the M phase bridge arm is controlled to be turned on, so that the AC charging module (50) charges the first battery module (11) through the turned-on lower bridge arm and the corresponding winding.

4. The charging power supply system (100) according to claim 1, characterized in that, The charging power supply system (100) also includes: Main positive relay (K1) and main negative relay (K2); A DC charging interface (60) includes a positive interface and a negative interface; The second switch (70) is used to connect the positive terminal of the power battery pack to the positive terminal via the second switch (70) and the main positive relay (K1). The third switch (80) and the negative terminal interface are connected to the negative terminal of the power battery pack in sequence through the third switch (80) and the main negative relay (K2); The motor controller (20) includes an M-phase bridge arm, and the motor (30) includes an M-phase winding. The first end of the M-phase winding is connected to the midpoint of the M-phase bridge arm in a one-to-one correspondence, and the second end of the M-phase winding is connected to form the neutral point (B). M≥3; The main controller is used to control the first switch (40) to close, control the on / off state of the main positive relay (K1), the main negative relay (K2), the second switch (70) and the third switch (80), and control the on / off state of the M-phase bridge arm when only one of the first battery module (11) and the second battery module (12) fails and a DC charging command is received. This allows the DC current flowing from the DC charging interface (60) to charge the unfailed battery module through the M-phase bridge arm and the M-phase winding.

5. The charging power supply system (100) according to claim 4, characterized in that, The positive electrode of the first battery module (11) is the positive electrode of the power battery pack, and the negative electrode of the second battery module (12) is the negative electrode of the power battery pack; The main controller is used for: When the first battery module (11) fails, the second battery module (12) does not fail, and the DC charging command is received, the first switch (40) is closed, the main positive relay (K1) is opened, the main negative relay (K2) is closed, the second switch (70) and the third switch (80) are closed, and the upper bridge arm of at least one phase bridge arm in the M phase bridge arm is turned on, so that the DC current flowing from the DC charging interface (60) charges the second battery module (12) through the turned-on upper bridge arm and the corresponding winding; When the second battery module (12) fails, the first battery module (11) does not fail, and the DC charging command is received, the first switch (40) is controlled to close, the main positive relay (K1) is closed, the main negative relay (K2) is opened, the second switch (70) and the third switch (80) are closed, and the lower bridge arm of at least one phase bridge arm in the M phase bridge arm is controlled to be turned on, so that the DC current flowing from the DC charging interface (60) charges the first battery module (11) through the turned-on lower bridge arm and the corresponding winding.

6. The charging power supply system (100) according to claim 1, characterized in that, The charging power supply system (100) also includes a main positive relay (K1), a main negative relay (K2), a fifth switch (K3), and a sixth switch (K4); The first battery module (11) is connected to one end of the fifth switch (K3) through the main positive relay (K1), and the other end of the fifth switch (K3) is connected to the first node (A); The second battery module (12) is connected to one end of the sixth switch (K4) through the main negative relay (K2), and the other end of the sixth switch (K4) is connected to the first node (A); The main controller is also used to control the main positive relay (K1), the main negative relay (K2), the fifth switch (K3), and the sixth switch (K4) to enable the undisturbed battery module to supply power when only one of the first battery module (11) and the second battery module (12) fails and a power supply command is received.

7. The charging power supply system (100) according to claim 6, characterized in that, The main controller is used for: When the first battery module (11) fails, the second battery module (12) does not fail, and the power supply command is received, the main positive relay (K1) is controlled to open, the main negative relay (K2) is closed, the fifth switch (K3) is closed, and the sixth switch (K4) is opened, so that the second battery module (12) supplies power to the outside. When the second battery module (12) fails, the first battery module (11) does not fail, and the power supply command is received, the main positive relay (K1) is closed, the main negative relay (K2) is opened, the fifth switch (K3) is opened, and the sixth switch (K4) is closed, so that the first battery module (11) supplies power to the outside.

8. A method for charging and supplying power to a power battery pack, characterized in that, include: If only one of the first battery module (11) and the second battery module (12) fails and a charging command is received, the first switch (40) is controlled to close, and the motor controller (20) is controlled to charge the unfailed battery module through the motor controller (20) and the motor (30). The power battery pack includes a first battery module (11) and a second battery module (12) connected in series; the motor controller (20) is connected to the power battery pack; the motor (30) is connected to the motor controller (20); the first node (A) between the first battery module (11) and the second battery module (12) is connected to the neutral point (B) of the motor (30) through the first switch (40).

9. The charging and power supply method according to claim 8, characterized in that, The motor controller (20) includes an M-phase bridge arm, the motor (30) includes an M-phase winding, the first end of the M-phase winding is connected to the midpoint of the M-phase bridge arm, the second end of the M-phase winding is connected to form the neutral point (B), M≥3, the AC charging module (50) is connected to the power battery pack, and the AC charging module (50) is used to convert the external AC power into DC power and charge the power battery pack; When only one of the first battery module (11) and the second battery module (12) fails, and a charging command is received, the first switch (40) is controlled to close, and the motor controller (20) is controlled to charge the unfailed battery module through the motor controller (20) and the motor (30), including: If only one of the first battery module (11) and the second battery module (12) fails, and an AC charging command is received, the first switch (40) is controlled to close, the main positive relay (K1) and the main negative relay (K2) are controlled to open and close, and the M-phase bridge arm is controlled to open and close, so that the AC charging module (50) charges the unfailed battery module through the M-phase bridge arm and the M-phase winding.

10. The charging and power supply method according to claim 9, characterized in that, The positive electrode of the first battery module (11) is the positive electrode of the power battery pack, and the negative electrode of the second battery module (12) is the negative electrode of the power battery pack; When only one of the first battery module (11) and the second battery module (12) fails, and an AC charging command is received, the first switch (40) is closed, the main positive relay (K1) and the main negative relay (K2) are switched on and off, and the M-phase bridge arm is switched on and off, so that the AC charging module (50) charges the unfailed battery module through the M-phase bridge arm and the M-phase winding, including: When the first battery module (11) fails, the second battery module (12) does not fail, and the AC charging command is received, the first switch (40) is controlled to close, the main positive relay (K1) is opened, the main negative relay (K2) is closed, and the upper bridge arm of at least one phase bridge arm in the M phase bridge arm is controlled to be turned on, so that the AC charging module (50) charges the second battery module (12) through the turned-on upper bridge arm and the corresponding winding; If the second battery module (12) fails but the first battery module (11) does not fail, and the AC charging command is received, the first switch (40) is controlled to close, the main positive relay (K1) is closed, the main negative relay (K2) is opened, and the lower bridge arm of at least one phase bridge arm in the M phase bridge arm is controlled to be turned on, so that the AC charging module (50) charges the first battery module (11) through the turned-on lower bridge arm and the corresponding winding.

11. The charging and power supply method according to claim 8, characterized in that, The motor controller (20) includes an M-phase bridge arm, and the motor (30) includes an M-phase winding. The first end of the M-phase winding is connected to the midpoint of the M-phase bridge arm in a one-to-one correspondence, and the second end of the M-phase winding is connected to form the neutral point (B). M≥3; The DC charging interface (60) includes a positive interface and a negative interface; the positive interface is connected to the positive terminal of the power battery pack in sequence through a second switch (70) and a main positive relay (K1); the negative interface is connected to the negative terminal of the power battery pack in sequence through a third switch (80) and a main negative relay (K2). The method further includes: If only one of the first battery module (11) and the second battery module (12) fails, and a DC charging command is received, the first switch (40) is controlled to close, the main positive relay (K1), the main negative relay (K2), the second switch (70) and the third switch (80) are controlled to open and close, and the M-phase bridge arm is controlled to open and close, so that the DC power flowing in from the DC charging interface (60) can charge the unfailed battery module through the M-phase bridge arm and the M-phase winding.

12. The charging and power supply method according to claim 11, characterized in that, The positive electrode of the first battery module (11) is the positive electrode of the power battery pack, and the negative electrode of the second battery module (12) is the negative electrode of the power battery pack; When only one of the first battery module (11) and the second battery module (12) fails, and a DC charging command is received, the first switch (40) is closed, the main positive relay (K1), the main negative relay (K2), the second switch (70), and the third switch (80) are switched on and off, and the M-phase bridge arm is switched on and off, so that the DC current flowing from the DC charging interface (60) charges the unfailed battery module through the M-phase bridge arm and the M-phase winding, including: When the first battery module (11) fails, the second battery module (12) does not fail, and the DC charging command is received, the first switch (40) is closed, the main positive relay (K1) is opened, the main negative relay (K2) is closed, the second switch (70) and the third switch (80) are closed, and the upper bridge arm of at least one phase bridge arm in the M phase bridge arm is turned on, so that the DC current flowing from the DC charging interface (60) charges the second battery module (12) through the turned-on upper bridge arm and the corresponding winding; When the second battery module (12) fails, the first battery module (11) does not fail, and the DC charging command is received, the first switch (40) is controlled to close, the main positive relay (K1) is closed, the main negative relay (K2) is opened, the second switch (70) and the third switch (80) are closed, and the lower bridge arm of at least one phase bridge arm in the M phase bridge arm is controlled to be turned on, so that the DC current flowing from the DC charging interface (60) charges the first battery module (11) through the turned-on lower bridge arm and the corresponding winding.

13. The charging and power supply method according to claim 8, characterized in that, The first battery module (11) is connected to one end of the fifth switch (K3) via the main positive relay (K1), and the other end of the fifth switch (K3) is connected to the first node (A); the second battery module (12) is connected to one end of the sixth switch (K4) via the main negative relay (K2), and the other end of the sixth switch (K4) is connected to the first node (A); The method further includes: If only one of the first battery module (11) and the second battery module (12) fails and a power supply command is received, the main positive relay (K1), the main negative relay (K2), the fifth switch (K3) and the sixth switch (K4) are controlled to enable the undisturbed battery module to supply power.

14. The charging and power supply method according to claim 13, characterized in that, When only one of the first battery module (11) and the second battery module (12) fails, and a power supply command is received, controlling the main positive relay (K1), the main negative relay (K2), the fifth switch (K3), and the sixth switch (K4) to enable the undisturbed battery module to supply power includes: When the first battery module (11) fails, the second battery module (12) does not fail, and the power supply command is received, the main positive relay (K1) is controlled to open, the main negative relay (K2) is closed, the fifth switch (K3) is closed, and the sixth switch (K4) is opened, so that the second battery module (12) supplies power to the outside. When the second battery module (12) fails, the first battery module (11) does not fail, and the power supply command is received, the main positive relay (K1) is closed, the main negative relay (K2) is opened, the fifth switch (K3) is opened, and the sixth switch (K4) is closed, so that the first battery module (11) supplies power to the outside.

15. A vehicle, characterized in that, The charging power supply system (100) includes any one of claims 1-7.

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