Power battery pack charging and power supply system and method and vehicle

Abstract

The invention relates to a power battery pack charging and power supply system and method and a vehicle. The power battery pack charging and power supply system (100) comprises: a power battery pack comprising a first battery module (11) and a second battery module (12) which are connected in series; a motor controller (20); the motor (30) is connected with the motor controller; 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); and the master controller is used for controlling the first switch to be switched on and controlling the motor controller under the condition that only one of the first battery module and the second battery module fails and a charging instruction is received, so that the battery module which does not fail is charged through the motor controller and the motor. When part of the battery modules fail, the motor controller and the motor can be utilized to form a loop, and only part of the battery modules which do not fail are charged, so that the endurance problem of the vehicle is solved.

Description

Technical Field

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

[0002] In the high-voltage system of electric vehicles, some power battery packs have multiple battery modules connected in series. If some of the battery modules fail or malfunction, it is usually treated as a failure or malfunction of the entire power battery pack. Summary of the invention

[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 the driving safety of the vehicle.

[0004] In order to achieve the above object, 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] The motor controller is connected to the power battery pack;

[0007] A motor, connected to a motor controller;

[0008] A first switch, wherein a first node between the first battery module and the second battery module is connected to a neutral point of the motor via the first switch;

[0009] The main controller is used to control the first switch to close and the motor controller to charge the battery module that has not failed 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.

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

[0011] The AC charging module is connected to the power battery pack and is used to convert the external input AC power into DC power for charging the power battery pack;

[0012] Main positive relay and main negative relay;

[0013] Wherein, the motor controller includes an M-phase bridge arm, the motor includes an M-phase winding, the first ends of the M-phase windings are connected to the midpoints of the M-phase bridge arms one by one, the second ends of the M-phase windings are connected together to form a neutral point, and M≥3;

[0014] The main controller is used to control the closing of the first switch, control the on and off of the main positive relay and the main negative relay, and control the on and off of the M-phase bridge arm when only one of the first battery module and the second battery module fails and receives an AC charging instruction, so that the AC charging module can charge the surviving battery module through the M-phase bridge arm and the M-phase winding.

[0015] 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;

[0016] The master controller is used to:

[0017] When the first battery module fails, the second battery module does not fail, and an AC charging instruction is received, the first switch is controlled to close, the main positive relay is disconnected, the main negative relay 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 charges the second battery module through the turned-on upper bridge arm and the corresponding winding;

[0018] When the second battery module fails, the first battery module does not fail, and an AC charging instruction is received, the first switch is controlled to close, the main positive relay is closed, the main negative relay is disconnected, 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 charges the first battery module through the turned-on lower bridge arm and the corresponding winding.

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

[0020] Main positive relay and main negative relay;

[0021] DC charging interface, including positive electrode interface and 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 includes an M-phase bridge arm, the motor includes an M-phase winding, the first ends of the M-phase windings are connected to the midpoints of the M-phase bridge arms one by one, the second ends of the M-phase windings are connected together to form a neutral point, and M≥3;

[0025] The main controller is used to control the closing of the first switch, control the on and off of the main positive relay, the main negative relay, the second switch and the third switch, and control the on and off of the M-phase bridge arm when only one of the first battery module and the second battery module fails and a DC charging instruction is received, so that the DC power flowing into the DC charging interface can charge the battery module that has not failed through the M-phase bridge arm and the M-phase winding.

[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 master controller is used to:

[0028] When the first battery module fails, the second battery module does not fail, and a DC charging instruction is received, the first switch is controlled to be closed, the main positive relay is disconnected, the main negative relay is closed, the second switch and the third switch are 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 DC power flowing in from the DC charging interface charges the second battery module through the turned-on upper bridge arm and the corresponding winding;

[0029] When the second battery module fails, the first battery module does not fail, and a DC charging instruction is received, the first switch is controlled to close, the main positive relay is closed, the main negative relay is disconnected, the second switch and the third switch 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 power flowing into the DC charging interface can charge the first battery module through the turned-on lower bridge arm and the corresponding winding.

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

[0031] 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;

[0032] 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;

[0033] The main controller is also used to control the main positive relay, the main negative relay, the fifth switch and the sixth switch when only one of the first battery module and the second battery module fails and receives a power supply instruction, so that the surviving battery module can supply power externally.

[0034] Optionally, the master controller is used to:

[0035] When the first battery module fails, the second battery module does not fail, and a power supply instruction is received, the main positive relay is controlled to be disconnected, 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 disconnected, so that the second battery module supplies power to the outside;

[0036] When the second battery module fails, the first battery module does not fail, and a power supply instruction is received, the main positive relay is controlled to close, the main negative relay is disconnected, the fifth switch is disconnected, and the sixth switch is closed, so that the first battery module supplies power to the outside.

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

[0038] When 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 close, and the motor controller is controlled to charge the battery module that has not failed through the motor controller and the motor;

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

[0040] Optionally, the motor controller includes an M-phase bridge arm, the motor includes an M-phase winding, the first ends of the M-phase windings are connected to the midpoints of the M-phase bridge arms one by one, the second ends of the M-phase windings are connected together to form a neutral point, M≥3, and the AC charging module is connected to the power battery pack, and the AC charging module is used to convert external input AC power into DC power and then charge the power battery pack;

[0041] When 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 close, and the motor controller is controlled to charge the battery module that has not failed through the motor controller and the motor, including:

[0042] When only one of the first battery module and the second battery module fails and an AC charging instruction is received, the first switch is controlled to close, the main positive relay and the main negative relay are controlled to be on and off, and the M-phase bridge arm is controlled to be on and off, so that the AC charging module can charge the surviving battery module through the M-phase bridge arm and the M-phase winding.

[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] When only one of the first battery module and the second battery module fails and an AC charging instruction is received, the first switch is controlled to close, the main positive relay and the main negative relay are controlled to be turned on and off, and the M-phase bridge arm is controlled to be turned on and off, so that the AC charging module charges the battery module that has not failed through the M-phase bridge arm and the M-phase winding, including:

[0045] When the first battery module fails, the second battery module does not fail, and an AC charging instruction is received, the first switch is controlled to close, the main positive relay is disconnected, the main negative relay 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 charges the second battery module through the turned-on upper bridge arm and the corresponding winding;

[0046] When the second battery module fails, the first battery module does not fail, and an AC charging instruction is received, the first switch is controlled to close, the main positive relay is closed, the main negative relay is disconnected, 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 charges the first battery module through the turned-on lower bridge arm and the corresponding winding.

[0047] Optionally, the motor controller includes an M-phase bridge arm, the motor includes an M-phase winding, the first ends of the M-phase windings are connected to the midpoints of the M-phase bridge arms one by one, the second ends of the M-phase windings are connected together to form a neutral point, and M≥3;

[0048] The DC charging interface includes 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; 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 also includes:

[0050] When only one of the first battery module and the second battery module fails and a DC charging instruction is received, the first switch is controlled to close, the main positive relay, the main negative relay, the second switch and the third switch are controlled to be on and off, and the M-phase bridge arm is controlled to be on and off, so that the DC power flowing into the DC charging interface can charge the surviving battery module through the M-phase bridge arm and the M-phase winding.

[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] When only one of the first battery module and the second battery module fails and a 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 off, and the M-phase bridge arm is controlled to be turned on and off, so that the DC power flowing from the DC charging interface charges the battery module that has not failed through the M-phase bridge arm and the M-phase winding, including:

[0053] When the first battery module fails, the second battery module does not fail, and a DC charging instruction is received, the first switch is controlled to be closed, the main positive relay is disconnected, the main negative relay is closed, the second switch and the third switch are 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 DC power flowing in from the DC charging interface charges the second battery module through the turned-on upper bridge arm and the corresponding winding;

[0054] When the second battery module fails, the first battery module does not fail, and a DC charging instruction is received, the first switch is controlled to close, the main positive relay is closed, the main negative relay is disconnected, the second switch and the third switch 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 power flowing into the DC charging interface can charge 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 a 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 a main negative relay, and the other end of the sixth switch is connected to the first node;

[0056] The method also includes:

[0057] When only one of the first battery module and the second battery module fails 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 enable the surviving battery module to supply power externally.

[0058] Optionally, when only one of the first battery module and the second battery module fails and a power supply instruction is received, controlling the main positive relay, the main negative relay, the fifth switch and the sixth switch to enable the battery module that has not failed to supply power externally includes:

[0059] When the first battery module fails, the second battery module does not fail, and a power supply instruction is received, the main positive relay is controlled to be disconnected, 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 disconnected, so that the second battery module supplies power to the outside;

[0060] When the second battery module fails, the first battery module does not fail, and a power supply instruction is received, the main positive relay is controlled to close, the main negative relay is disconnected, the fifth switch is disconnected, and the sixth switch is closed, so that the first battery module supplies power to the outside.

[0061] The present disclosure also provides a vehicle, comprising the above-mentioned power battery pack charging and power supply system provided by the present disclosure.

[0062] Through 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 a first switch. When 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 close, and the motor controller is controlled to charge the battery module that has not failed through the motor controller and the motor. In this way, when some battery modules fail, the motor controller and the motor can be used to form a loop, and only some of the battery modules that have not failed can be charged, thereby solving the vehicle's endurance problem.

[0063] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] 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:

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

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

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

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

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

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

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

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

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

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

[0075] Fig.11 It is a flow chart of a method for charging and supplying power to a power battery pack provided by an exemplary embodiment. DETAILED DESCRIPTION

[0076] 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.

[0077] Figure 1 FIG. 1 is a circuit diagram of a power battery pack charging and power supply system provided by an exemplary embodiment. Figure 1 As shown, the power battery pack charging and power supply system 100 may 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 to the power battery pack. The motor 30 is connected to the motor controller 20. A first node A between the first battery module 11 and the second battery module 12 is connected to a neutral point B of the motor 30 via a first switch 40.

[0079] The main controller is used to control the first switch 40 to close and the motor controller 20 to charge the remaining 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 instruction is received.

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

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

[0082] The charging instruction is used to instruct the power battery pack to charge. For example, when the user inserts the charging gun into the charging port of the vehicle, the charging instruction can be automatically triggered.

[0083] In the related art, when a part of the power battery pack connected in series fails or malfunctions, since other non-failed parts are connected in series with the failed part, the non-failed part cannot provide power to the high-voltage system and cannot play its role. Moreover, since multiple parts are connected in series, when one part fails, the failed part is equivalent to a short circuit. At this time, the non-failed part cannot be charged.

[0084] In the circuit structure disclosed in the present invention, 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 connection between the first node A and the neutral point B, the motor and the motor controller can be used to charge the half-pack battery that has not failed.

[0085] Through 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 a first switch. When 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 close, and the motor controller is controlled to charge the battery module that has not failed through the motor controller and the motor. In this way, when some battery modules fail, the motor controller and the motor can be used to form a loop, and only some of the battery modules that have not failed can be charged, thereby solving the vehicle's endurance problem.

[0086] Figure 2 FIG. 1 is a circuit diagram of a power battery pack charging and power supply system provided by another exemplary embodiment. Figure 2 As shown, the charging and power supply system 100 further includes an AC charging module 50, a main positive relay K1 and a main negative relay K2. The AC charging module 50 is connected to the power battery pack and is used to convert external input AC power into DC power for charging the power battery pack.

[0087] The motor controller 20 includes an M-phase bridge arm, the motor 30 includes an M-phase winding, the first ends of the M-phase windings are connected to the midpoints of the M-phase bridge arms one by one, and the second ends of the M-phase windings are connected together to form a neutral point B, M≥3. Figure 2 In the embodiment, M=3.

[0088] The main controller is used to control the closing of the first switch 40, control the on and off of the main positive relay K1 and the main negative relay K2, and control the on and off of the M-phase bridge arm when only one of the first battery module 11 and the second battery module 12 fails and receives an AC charging instruction, so that the AC charging module 50 can charge the surviving battery module through the M-phase bridge arm and the M-phase winding.

[0089] The AC charging instruction is used to instruct the power battery pack to be charged with external AC power. For example, when the user inserts the charging gun of the AC charging pile into the AC charging port of the vehicle, the AC charging instruction can be automatically triggered.

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

[0091] In this embodiment, an AC charging module 50 is used to convert external AC power into DC power. When charging the power battery pack, a charging circuit can be formed by controlling the on and off of the main positive relay K1, the main negative relay K2, the first switch 40 and the M-phase bridge arm to isolate the failed battery module and charge the non-failed battery module.

[0092] 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.

[0093] The main controller is used to: when 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 close, the main positive relay K1 to disconnect, the main negative relay K2 to close, and control the upper bridge arm of at least one phase bridge arm in the M phase bridge arm 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 FIG. 1 is a schematic diagram of the current flow during AC charging when the first battery module fails, provided by an exemplary embodiment. Figure 3 As shown, 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 control 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.

[0095] In other embodiments, the upper bridge arm of another phase or multiple phases of the three-phase bridge arm of the motor controller 20 may be turned on to charge the second battery module 12 .

[0096] In another embodiment, the main controller is used to: when 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 close, the main positive relay K1 to close, the main negative relay K2 to disconnect, and control the lower bridge arm of at least one phase bridge arm in the M phase bridge arm 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 4FIG. 1 is a schematic diagram of the current flow during AC charging when the second battery module fails, provided by an exemplary embodiment. Figure 4 As shown, 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 control 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] exist Figure 3 and Figure 4 In the embodiment of the present invention, the charging and power supply system 100 further includes a first capacitor C1. The first capacitor C1 is arranged between the positive and negative electrodes of the busbar of the power battery pack for voltage stabilization.

[0099] In other embodiments, the upper bridge arm of another phase or multiple phases of the three-phase bridge arm of the motor controller 20 may be turned on to charge the first battery module 11 .

[0100] In other embodiments, the charging and power supply system 100 can also utilize external direct current to charge the intact battery modules. Figure 5 FIG. 1 is a circuit diagram of a power battery pack charging and power supply system provided by another exemplary embodiment. Figure 5 As shown, 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 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 70 and the positive relay K1 in sequence; the negative electrode interface is connected to the negative electrode 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 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 one by one, and the second end of the M-phase winding is connected to form a neutral point B, M≥3. Figure 5 In the embodiment, M=3.

[0103] The main controller is used to control the closing of the first switch 40, control the on and off of the main positive relay K1, the main negative relay K2, the second switch 70 and the third switch 80, and control the on and off of the M-phase bridge arm when only one of the first battery module 11 and the second battery module 12 fails and receives a DC charging instruction, so that the DC power flowing into the DC charging interface 60 can charge the battery module that has not failed through the M-phase bridge arm and the M-phase winding.

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

[0105] In this embodiment, when the power battery pack is charged with direct current, a charging circuit can be formed by controlling the on and off of the main positive relay K1, the main negative relay K2, the first switch 40 and the M-phase bridge arm to isolate the failed battery module and charge the remaining battery module. Figure 5 In the embodiment of the present invention, the charging and power supply system 100 further includes a fourth switch 90 and a second capacitor C2. The positive electrode interface of the DC 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 electrode interface of the DC charging interface 60 and the negative electrode of the busbar 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 main controller is used to: when the first battery module 11 fails, the second battery module 12 does not fail, and a DC charging instruction is received, control the first switch 40 to close, the main positive relay K1 to disconnect, the main negative relay K2 to close, the second switch 70 and the third switch 80 to close, and control the upper bridge arm of at least one phase bridge arm in the M-phase bridge arm to be turned on, so that the DC power flowing into the DC charging interface 60 can charge the second battery module 12 through the turned-on upper bridge arm and the corresponding winding.

[0108] Figure 6 FIG. 1 is a schematic diagram of the current flow during DC charging when the first battery module fails, provided by an exemplary embodiment. Figure 6 As shown, 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 control motor controller 20 is turned on, and the current flowing in from the DC charging interface 60 forms a loop in the direction indicated by the arrow to charge the second battery module 12.

[0109] In other embodiments, the upper bridge arm of another phase or multiple phases of the three-phase bridge arm of the motor controller 20 may be turned on to charge the second battery module 12 .

[0110] In another embodiment, the main controller is used to: when the second battery module 12 fails, the first battery module 11 does not fail, and a DC charging instruction is received, control the first switch 40 to close, the main positive relay K1 to close, the main negative relay K2 to open, the second switch 70 and the third switch 80 to close, and control the lower bridge arm of at least one phase bridge arm in the M-phase bridge arm to be turned on, so that the DC power flowing into the DC charging interface 60 can charge the first battery module 11 through the turned-on lower bridge arm and the corresponding winding.

[0111] Figure 7 FIG. 1 is a schematic diagram of the current flow during DC charging when the second battery module fails, provided by an exemplary embodiment. Figure 7 As shown, 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 control motor controller 20 is turned on, and the current flowing in from the DC charging interface 60 forms a loop in the direction indicated by the arrow to charge the first battery module 11.

[0112] In other embodiments, the lower bridge arm of another phase or multiple phases of the three-phase bridge arm of the motor controller 20 may be turned on to charge the first battery module 11 .

[0113] The power battery pack charging and power supply system disclosed in the present invention can also isolate failed battery modules so that the remaining battery modules can supply power externally.

[0114] Figure 8 FIG. 1 is a circuit diagram of a power battery pack charging and power supply system provided by another exemplary embodiment. Figure 8 As shown, 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 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.

[0116] 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.

[0117] 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 when only one of the first battery module 11 and the second battery module 12 fails and receives a power supply instruction, so that the surviving battery module can supply power externally.

[0118] The power supply instruction may be, for example, an instruction triggered by the user to start the vehicle. By controlling the on and off 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 intact battery module can be used to supply power to the outside. In this way, it is ensured that when only a part of the battery modules in the power battery pack fails, the failed part can be isolated, and the intact part can 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, half the voltage of the entire power battery pack is provided to the high-voltage system for power supply, ensuring that the high-voltage load continues to work and the motor can continue to drive, thereby improving the safety of vehicle driving.

[0119] In one embodiment, the main controller is used to: when 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 open, the main negative relay K2 to close, the fifth switch K3 to close, and the sixth switch K4 to open, so that the second battery module 12 can supply power to the outside.

[0120] Fig. 9 FIG. 1 is a schematic diagram of the current flow of the power battery pack when the first battery module fails, provided by an exemplary embodiment. Fig. 9 As shown, 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 disconnected, the main negative relay K2 is closed, the fifth switch K3 is closed, and the sixth switch K4 is disconnected. In this way, the current output by the second battery module 12 is Fig. 9 Power is supplied to the load in the direction indicated by the arrow.

[0121] In one embodiment, the main controller is used to: when 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 close, the main negative relay K2 to open, the fifth switch K3 to open, and the sixth switch K4 to close, so that the first battery module 11 can supply power to the outside.

[0122] Fig.10 FIG. 1 is a schematic diagram of the current flow of the power battery pack when the second battery module fails, provided by an exemplary embodiment. Fig.10 As shown, when the second battery module 12 fails and the first battery module 11 does not fail, the main positive relay K1 is controlled to close, the main negative relay K2 is disconnected, the fifth switch K3 is disconnected, and the sixth switch K4 is closed. In this way, the current output by the first battery module 11 is Fig.10 Power is supplied to the load in the direction indicated by the arrow.

[0123] The present disclosure also provides a method for charging and supplying power to a power battery pack. Fig.11 FIG. 1 is a flow chart of a method for charging and supplying power to a power battery pack provided by an exemplary embodiment. Fig.11 As shown, the method includes step S101: when only one of the first battery module 11 and the second battery module 12 fails and a charging instruction is received, the first switch 40 is controlled to close, and the motor controller 20 is controlled to charge the battery module that has not failed through the motor controller 20 and the motor 30.

[0124] Among them, 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 a first switch 40.

[0125] Optionally, the motor controller 20 includes an M-phase bridge arm, the motor 30 includes an M-phase winding, the first ends of the M-phase windings are connected to the midpoints of the M-phase bridge arms one by one, the second ends of the M-phase windings are connected together to form a neutral point B, M≥3, and the AC charging module 50 is connected to the power battery pack, and the AC charging module 50 is used to convert the external input AC power into DC power and then charge the power battery pack;

[0126] When only one of the first battery module 11 and the second battery module 12 fails 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 battery module that has not failed through the motor controller 20 and the motor 30, including:

[0127] When only one of the first battery module 11 and the second battery module 12 fails and an AC charging instruction is received, the first switch 40 is controlled to close, the main positive relay K1 and the main negative relay K2 are controlled to be on and off, and the M-phase bridge arm is controlled to be on and off, so that the AC charging module 50 can charge the surviving battery module through the M-phase bridge arm and the M-phase winding.

[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] When only one of the first battery module 11 and the second battery module 12 fails and an AC charging instruction is received, the first switch 40 is controlled to be closed, the main positive relay K1 and the main negative relay K2 are controlled to be turned on and off, and the M-phase bridge arm is controlled to be turned on and off, so that the AC charging module 50 charges the battery module that has not failed through the M-phase bridge arm and the M-phase winding, including:

[0130] When the first battery module 11 fails, the second battery module 12 does not fail, and an AC charging instruction is received, the first switch 40 is controlled to be closed, the main positive relay K1 is disconnected, 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;

[0131] When the second battery module 12 fails, the first battery module 11 does not fail, and an AC charging instruction is received, the first switch 40 is controlled to close, the main positive relay K1 is closed, the main negative relay K2 is disconnected, 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.

[0132] Optionally, the motor controller 20 includes an M-phase bridge arm, the motor 30 includes an M-phase winding, the first ends of the M-phase windings are connected to the midpoints of the M-phase bridge arms one by one, and the second ends of the M-phase windings are connected together to form a neutral point B, M≥3;

[0133] The DC charging interface 60 includes 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 70 and the main positive relay K1 in sequence; the negative electrode interface is connected to the negative electrode of the power battery pack through the third switch 80 and the main negative relay K2;

[0134] The method also includes:

[0135] When only one of the first battery module 11 and the second battery module 12 fails and a DC charging instruction 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 be on and off, and the M-phase bridge arm is controlled to be on and off, so that the DC power flowing into the DC charging interface 60 can charge the battery module that has not failed 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] When only one of the first battery module 11 and the second battery module 12 fails and a DC 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 off, and the M-phase bridge arm is controlled to be turned on and off, so that the DC power flowing from the DC charging interface 60 charges the battery module that has not failed through the M-phase bridge arm and the M-phase winding, including:

[0138] When the first battery module 11 fails, the second battery module 12 does not fail, and a DC charging instruction is received, the first switch 40 is controlled to be closed, the main positive relay K1 is disconnected, 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 controlled to be turned on, so that the DC power flowing in from the DC charging interface 60 charges the second battery module 12 through the turned-on upper bridge arm and the corresponding winding;

[0139] When the second battery module 12 fails, the first battery module 11 does not fail, and a DC charging instruction is received, the first switch 40 is controlled to be closed, the main positive relay K1 is closed, the main negative relay K2 is disconnected, 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 power flowing into the DC charging interface 60 can charge 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 also includes:

[0142] When 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 enable the remaining battery module to supply power externally.

[0143] Optionally, when 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 enable the battery module that has not failed to supply power externally, including:

[0144] When 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] When 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 close, the main negative relay K2 is disconnected, the fifth switch K3 is disconnected, and the sixth switch K4 is closed, so that the first battery module 11 supplies power to the outside.

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

[0147] 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.

[0148] 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.

[0149] 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 pack charging and power supply system (100), characterized in that: include: A power battery pack comprises a first battery module (11) and a second battery module (12) connected in series; A motor controller (20), connected to the power battery pack; A motor (30) connected to the motor controller (20); A first switch (40), wherein a first node (A) between the first battery module (11) and the second battery module (12) is connected to a neutral point (B) of the motor (30) via the first switch (40); A main controller is used for controlling the first switch (40) to close and the motor controller (20) to charge the battery module that has not failed 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 instruction is received.

2. The charging and power supply system (100) according to claim 1, characterized in that: The charging and power supply system (100) further includes: An AC charging module (50), connected to the power battery pack, for converting externally input AC power into DC power for charging the power battery pack; Main positive relay (K1) and main negative relay (K2); The motor controller (20) comprises an M-phase bridge arm, the motor (30) comprises an M-phase winding, the first ends of the M-phase windings are connected to the midpoints of the M-phase bridge arms one by one, the second ends of the M-phase windings are connected together to form the neutral point (B), and M≥3; The master controller is used to control the first switch (40) to close, 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 arm when only one of the first battery module (11) and the second battery module (12) fails and an AC charging instruction is received, so that the AC charging module (50) charges the battery module that has not failed through the M-phase bridge arm and the M-phase winding.

3. The charging and 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 master controller is used for: When the first battery module (11) fails, the second battery module (12) does not fail, and the AC charging instruction is received, the first switch (40) is controlled to be closed, the main positive relay (K1) is disconnected, the main negative relay (K2) is closed, and the upper bridge arm of at least one phase bridge arm in the M phase bridge arms 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; When the second battery module (12) fails, the first battery module (11) does not fail, and the AC charging instruction is received, the first switch (40) is controlled to be closed, the main positive relay (K1) is closed, the main negative relay (K2) is disconnected, 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 and power supply system (100) according to claim 1, characterized in that: The charging and power supply system (100) further includes: Main positive relay (K1) and main negative relay (K2); A DC charging interface (60), including a positive electrode interface and a negative electrode interface; A second switch (70), wherein the positive electrode interface is connected to the positive electrode of the power battery pack via the second switch (70) and the main positive relay (K1) in sequence; A third switch (80), wherein the negative electrode interface is connected to the negative electrode of the power battery pack in sequence through the third switch (80) and the main negative relay (K2); The motor controller (20) comprises an M-phase bridge arm, the motor (30) comprises an M-phase winding, the first ends of the M-phase windings are connected to the midpoints of the M-phase bridge arms one by one, the second ends of the M-phase windings are connected together to form the neutral point (B), and M≥3; The master controller is used to control the first switch (40) to close, control the on / off 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 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 instruction is received, so that the DC power flowing in from the DC charging interface (60) charges the battery module that has not failed through the M-phase bridge arm and the M-phase winding.

5. The charging and 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 master controller is used for: When the first battery module (11) fails, the second battery module (12) does not fail, and the DC charging instruction is received, the first switch (40) is controlled to be closed, the main positive relay (K1) is disconnected, 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 of the M-phase bridge arms is controlled to be turned on, so that the DC power flowing in 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 instruction is received, the first switch (40) is controlled to be closed, the main positive relay (K1) is closed, the main negative relay (K2) is disconnected, the second switch (70) and the third switch (80) are closed, and the lower bridge arm of at least one of the M-phase bridge arms is controlled to be turned on, so that the DC power flowing in 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 and power supply system (100) according to claim 1, characterized in that: The charging and power supply system (100) further comprises 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 master 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) when only one of the first battery module (11) and the second battery module (12) fails and a power supply instruction is received, so that the battery module that has not failed supplies power to the outside.

7. The charging and power supply system (100) according to claim 6, characterized in that: The master controller is used for: When the first battery module (11) fails, the second battery module (12) does not fail, and the 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; When the second battery module (12) fails, the first battery module (11) does not fail, and the 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.

8. A method for charging and supplying power to a power battery pack, characterized in that: include: When only one of the first battery module (11) and the second battery module (12) fails 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 battery module that has not failed through the motor controller (20) and the motor (30); The power battery pack comprises the first battery module (11) and the 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); and a first node (A) between the first battery module (11) and the second battery module (12) is connected to a neutral point (B) of the motor (30) via the first switch (40).

9. The charging and power supply method according to claim 8, characterized in that: The motor controller (20) comprises an M-phase bridge arm, the motor (30) comprises an M-phase winding, the first ends of the M-phase windings are connected to the midpoints of the M-phase bridge arms one by one, the second ends of the M-phase windings are connected together to form the neutral point (B), M≥3, an AC charging module (50) is connected to the power battery pack, and the AC charging module (50) is used to convert externally input AC power into DC power and then charge the power battery pack; When only one of the first battery module (11) and the second battery module (12) fails 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 battery module that has not failed through the motor controller (20) and the motor (30), comprising: When only one of the first battery module (11) and the second battery module (12) fails and an AC charging instruction is received, the first switch (40) is controlled to be closed, the main positive relay (K1) and the main negative relay (K2) are controlled to be turned on and off, and the M-phase bridge arm is controlled to be turned on and off, so that the AC charging module (50) charges the battery module that has not failed 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 instruction is received, the first switch (40) is controlled to be closed, the main positive relay (K1) and the main negative relay (K2) are controlled to be turned on and off, and the M-phase bridge arm is controlled to be turned on and off, so that the AC charging module (50) charges the battery module that has not failed through the M-phase bridge arm and the M-phase winding, comprising: When the first battery module (11) fails, the second battery module (12) does not fail, and the AC charging instruction is received, the first switch (40) is controlled to be closed, the main positive relay (K1) is disconnected, the main negative relay (K2) is closed, and the upper bridge arm of at least one phase bridge arm in the M phase bridge arms 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; When the second battery module (12) fails, the first battery module (11) does not fail, and the AC charging instruction is received, the first switch (40) is controlled to be closed, the main positive relay (K1) is closed, the main negative relay (K2) is disconnected, 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) comprises an M-phase bridge arm, the motor (30) comprises an M-phase winding, the first ends of the M-phase windings are connected to the midpoints of the M-phase bridge arms one by one, the second ends of the M-phase windings are connected together to form the neutral point (B), and M≥3; The DC 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 a second switch (70) and a main positive relay (K1); the negative electrode interface is connected to the negative electrode of the power battery pack in sequence through a third switch (80) and a main negative relay (K2); The method further comprises: When only one of the first battery module (11) and the second battery module (12) fails and a DC 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 off, and the M-phase bridge arm is controlled to be turned on and off, so that the DC power flowing in from the DC charging interface (60) charges the battery module that has not failed 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 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 off, and the M-phase bridge arm is controlled to be turned on and off, so that the DC power flowing from the DC charging interface (60) charges the battery module that has not failed through the M-phase bridge arm and the M-phase winding, comprising: When the first battery module (11) fails, the second battery module (12) does not fail, and the DC charging instruction is received, the first switch (40) is controlled to be closed, the main positive relay (K1) is disconnected, 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 of the M-phase bridge arms is controlled to be turned on, so that the DC power flowing in 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 instruction is received, the first switch (40) is controlled to be closed, the main positive relay (K1) is closed, the main negative relay (K2) is disconnected, the second switch (70) and the third switch (80) are closed, and the lower bridge arm of at least one of the M-phase bridge arms is controlled to be turned on, so that the DC power flowing in 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 a fifth switch (K3) via a 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 a sixth switch (K4) via a main negative relay (K2), and the other end of the sixth switch (K4) is connected to the first node (A); The method further comprises: When 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 enable the battery module that has not failed to supply power to the outside.

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 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 enable the battery module that has not failed to supply power externally, comprising: When the first battery module (11) fails, the second battery module (12) does not fail, and the 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; When the second battery module (12) fails, the first battery module (11) does not fail, and the 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.

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

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