Driving system, charging and discharging system and vehicle

Abstract

The invention discloses a driving system, a charging and discharging system and a vehicle, relates to the technical field of electric vehicles, and aims to improve the reliability of the vehicle driving system. The drive system includes a first control circuit and a first motor, a second control circuit and a second motor, and a third control circuit. The first control circuit comprises a first bridge arm, the first motor comprises a first coil, and the common connection end of an upper half bridge and a lower half bridge of the first bridge arm is connected with the first coil. The second driving assembly comprises a second control circuit and a second motor, the second control circuit comprises a second bridge arm, the second motor comprises a second coil, and the common connection end of the upper half bridge and the lower half bridge of the second bridge arm is connected with the second coil. The third control circuit comprises a control unit, the first coil is connected with the first end of the control unit, and the second coil is connected with the second end of the control unit. And the third control circuit is configured to enable the first coil to be communicated with the second bridge arm through the control unit, or enable the second coil to be communicated with the first bridge arm through the control unit.

Description

Technical Field

[0001] The present disclosure relates to the technical field of electric vehicles, and particularly to a drive system, a charge and discharge system, and a vehicle. Background Art

[0002] The use of a multi-motor drive method can make the driving and acceleration performance of an automobile stronger. When a motor or a motor controller in a multi-motor drive system fails, the failed motor or the motor connected to the failed motor controller stops operating, and the vehicle is driven by the remaining motors.

[0003] However, the inability of any motor to operate normally will result in a reduction in the output power of the drive and a deterioration in the dynamic performance of the vehicle. Summary of the Invention

[0004] The object of the present invention is to provide a drive system, a charge and discharge system, and a vehicle, aiming to improve the reliability of the vehicle drive system.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] The present invention provides a drive system including: a first drive component, a second drive component, and a third control circuit. The first drive component includes a first control circuit and a first motor, and the first control circuit is connected between a power source and the first motor. The second drive component includes a second control circuit and a second motor, and the second control circuit is connected between the power source and the second motor.

[0007] The first control circuit includes an M-phase first bridge arm, and the first motor includes an M-phase first coil. The common connection end of the upper half bridge and the lower half bridge of the i-th phase first bridge arm is connected to the i-th phase first coil; M is a positive integer greater than or equal to 2, and 1 ≤ i ≤ M. The second control circuit includes an M-phase second bridge arm, and the second motor includes an M-phase second coil. The common connection end of the upper half bridge and the lower half bridge of the i-th phase second bridge arm is connected to the i-th phase second coil.

[0008] The third control circuit includes an M-phase control unit; the i-th phase first coil is connected to the first end of the i-th phase control unit, and the i-th phase second coil is connected to the second end of the i-th phase control unit. The third control circuit is configured to connect the i-th phase first coil to the i-th phase second bridge arm through the i-th phase control unit, or connect the i-th phase second coil to the i-th phase first bridge arm through the i-th phase control unit.

[0009] The drive system provided by the embodiment of the present application, by setting a third control circuit, when one of the in-phase bridge arms of the first control circuit and the second control circuit has a fault and the other conducts normally, connects the motor coil connected to the faulty bridge arm in the same phase to the normally conducting bridge arm, so as to ensure that the coil of each motor can be normally connected to the power supply and ensure the reliability of the drive system.

[0010] In some embodiments, the third control circuit is configured to, when one of the first bridge arm of the i-th phase and the second bridge arm of the i-th phase has a fault and the other conducts, connect, through the i-th phase control unit, the coil connected to the faulty bridge arm in the first bridge arm of the i-th phase and the second bridge arm of the i-th phase to the conducting bridge arm.

[0011] In some embodiments, the i-th phase control unit is configured to, when the upper half bridge of the first bridge arm of the i-th phase connected to the i-th phase control unit has a fault or is turned off and the upper half bridge of the second bridge arm of the i-th phase connected to the i-th phase control unit conducts, connect the first coil of the i-th phase connected to the upper half bridge of the first bridge arm of the i-th phase to the upper half bridge of the second bridge arm of the i-th phase.

[0012] In some embodiments, the i-th phase control unit is configured to, when the lower half bridge of the first bridge arm of the i-th phase connected to the i-th phase control unit has a fault or is turned off and the lower half bridge of the second bridge arm of the i-th phase connected to the i-th phase control unit conducts, connect the first coil of the i-th phase connected to the lower half bridge of the first bridge arm of the i-th phase to the lower half bridge of the second bridge arm of the i-th phase.

[0013] In some embodiments, the i-th phase control unit is configured to, when the upper half bridge of the second bridge arm of the i-th phase connected to the i-th phase control unit has a fault or is turned off and the upper half bridge of the first bridge arm of the i-th phase connected to the i-th phase control unit conducts, connect the second coil of the i-th phase connected to the upper half bridge of the second bridge arm of the i-th phase to the upper half bridge of the first bridge arm of the i-th phase.

[0014] In some embodiments, the i-th phase control unit is configured to, when the lower half bridge of the second bridge arm of the i-th phase connected to the i-th phase control unit has a fault or is turned off and the lower half bridge of the first bridge arm of the i-th phase connected to the i-th phase control unit conducts, connect the second coil of the i-th phase connected to the lower half bridge of the second bridge arm of the i-th phase to the lower half bridge of the first bridge arm of the i-th phase.

[0015] In some embodiments, when a fault occurs in the upper half-bridge of one of the first arm and the second arm of the i-th phase, and the upper half-bridge of the other is conducting, the i-th phase control unit is configured to parallel the conducting upper half-bridge in the first arm and the second arm of the i-th phase with the faulty upper half-bridge; and / or, the third control circuit is configured to, when a fault occurs in the lower half-bridge of one of the first arm and the second arm of the i-th phase, and the lower half-bridge of the other is conducting, the i-th phase control unit is configured to parallel the conducting lower half-bridge in the first arm and the second arm of the i-th phase with the faulty lower half-bridge.

[0016] In some embodiments, when a fault occurs in the upper half-bridge of one of the first arm and the second arm of the i-th phase, and the upper half-bridge of the other is conducting, the lower half-bridge of the arm with the faulty upper half-bridge in the first arm and the second arm of the i-th phase is not faulty; or, when a fault occurs in the upper half-bridge of one of the first arm and the second arm of the i-th phase, and the upper half-bridge of the other is conducting, the lower half-bridge of the arm with the faulty upper half-bridge in the first arm and the second arm of the i-th phase is open-circuited.

[0017] In some embodiments, when a fault occurs in the lower half-bridge of one of the first arm and the second arm of the i-th phase, and the lower half-bridge of the other is conducting, the upper half-bridge of the arm with the faulty lower half-bridge in the first arm and the second arm of the i-th phase is not faulty; or, when a fault occurs in the lower half-bridge of one of the first arm and the second arm of the i-th phase, and the lower half-bridge of the other is conducting, the upper half-bridge of the arm with the faulty lower half-bridge in the first arm and the second arm of the i-th phase is open-circuited.

[0018] In some embodiments, the third control circuit is configured to, when the upper half-bridge of one of the first arm and the second arm of the i-th phase is turned off, and the upper half-bridge of the other is conducting, the i-th phase control unit is configured to parallel the conducting upper half-bridge in the first arm and the second arm of the i-th phase with the turned-off upper half-bridge; and / or, the third control circuit is configured to, when the lower half-bridge of one of the first arm and the second arm of the i-th phase is turned off, and the lower half-bridge of the other is conducting, the i-th phase control unit is configured to parallel the conducting lower half-bridge in the first arm and the second arm of the i-th phase with the turned-off lower half-bridge.

[0019] In some embodiments, the third control circuit is configured to, when the first arm of the i-th phase is faulty, the second arm of the i-th phase is conducting normally, the second arm of the j-th phase is faulty, and the first arm of the j-th phase is conducting normally, the i-th phase control unit is configured to connect the first coil and the second arm of the i-th phase, and the j-th phase control unit is configured to connect the second coil and the first arm of the j-th phase; 1 ≤ j ≤ M, and i is not equal to j.

[0020] In some embodiments, the first arm of the M-phase includes a first sub-arm and a second sub-arm, the first coil of the M-phase includes a first sub-coil and a second sub-coil, the first sub-coil, the upper half-bridge and the lower half-bridge of the first sub-arm are commonly connected to a first node, and the second sub-coil, the upper half-bridge and the lower half-bridge of the second sub-arm are commonly connected to a second node.

[0021] The second arm of the M-phase includes a third sub-arm and a fourth sub-arm, the second coil of the M-phase includes a third sub-coil and a fourth sub-coil, the third sub-coil, the upper half-bridge and the lower half-bridge of the third sub-arm are commonly connected to a third node, and the fourth sub-coil, the upper half-bridge and the lower half-bridge of the fourth sub-arm are commonly connected to a fourth node.

[0022] The M control units include a first control unit and a second control unit. The first control unit is connected between the first node and the third node, and the second control unit is connected between the second node and the fourth node.

[0023] In some embodiments, the first control unit is configured to, when a fault occurs or the upper half-bridge of the first sub-arm is turned off and the upper half-bridge of the third sub-arm is turned on, connect the first sub-coil to the upper half-bridge of the third sub-arm, so that the current flowing through the upper half-bridge of the third sub-arm passes through the first control unit to the first sub-coil.

[0024] In some embodiments, the second control unit is configured to, when a fault occurs or the lower half-bridge of the second sub-arm is turned off and the lower half-bridge of the fourth sub-arm is turned on, connect the second sub-coil to the lower half-bridge of the fourth sub-arm, so that the current sequentially passes through the second sub-coil, the second control unit, the lower half-bridge of the fourth sub-arm, and reaches the second pole of the power supply.

[0025] In some embodiments, the first control unit is configured to, when a fault occurs or the upper half-bridge of the third sub-arm is turned off and the upper half-bridge of the first sub-arm is turned on, connect the third sub-coil to the upper half-bridge of the first sub-arm, so that the current flowing through the upper half-bridge of the first sub-arm passes through the first control unit to the third sub-coil.

[0026] In some embodiments, the second control unit is configured to, when a fault occurs or the lower half-bridge of the fourth sub-arm is turned off and the lower half-bridge of the second sub-arm is turned on, connect the fourth sub-coil to the lower half-bridge of the second sub-arm, so that the current sequentially passes through the fourth sub-coil, the second control unit, the lower half-bridge of the second sub-arm, and reaches the second pole of the power supply.

[0027] In some embodiments, the control unit includes at least one of: a MOS transistor, a transistor and a diode connected in parallel, or a control switch.

[0028] The present invention also provides a vehicle. The vehicle includes: a drive system provided in any of the above embodiments.

[0029] The vehicle has the same structure and beneficial effects as the drive system described in any of the above embodiments, which will not be elaborated here.

[0030] The present invention also provides a charge and discharge system. The charge and discharge system includes: a first drive assembly, a second drive assembly, and a third control circuit. The first drive assembly includes a first control circuit and a first motor, and the first control circuit is connected between the battery pack and the first motor. The second drive assembly includes a second control circuit and a second motor, and the second control circuit is connected between the battery pack and the second motor.

[0031] The first control circuit includes M first-phase arms, where M is a positive integer greater than or equal to 2. The first end and the second end of each first-phase arm are respectively connected to the positive extreme and the negative extreme of the battery pack. The first motor includes M first-phase coils, and the common connection end of the upper half-bridge and the lower half-bridge of the i-th first-phase arm is connected to the first end of the i-th first-phase coil; 1 ≤ i ≤ M.

[0032] The second ends of the M first-phase coils are commonly connected to a first neutral point, the positive extreme of the battery pack is connected to the first neutral point, and the negative extreme of the battery pack is connected to the first neutral point.

[0033] The second control circuit includes M second-phase arms, and the first end and the second end of each second-phase arm are respectively connected to the positive extreme and the negative extreme of the battery pack. The second motor includes M first-phase coils, and the common connection end of the upper half-bridge and the lower half-bridge of the i-th second-phase arm is connected to the first end of the i-th second-phase coil.

[0034] The third control circuit includes M phase control units. The common connection end of the i-th first-phase arm and the i-th first-phase coil is connected to the first end of the i-th phase control unit, and the common connection end of the i-th second-phase arm and the i-th second-phase coil is connected to the second end of the i-th phase control unit. The third control circuit is configured to connect the i-th first-phase coil to the i-th second-phase arm through the i-th phase control unit.

[0035] In the charge and discharge system provided by the embodiments of the present application, by setting the third control circuit, when a fault occurs in the arm of the first control circuit and the same-phase arm of the second control circuit conducts normally, the first coil connected to the faulty arm of the first control circuit is connected to the same-phase and normally conducting arm in the second control circuit, so as to ensure that the coils of each motor can be normally connected to the battery pack and ensure the reliability of the charge and discharge system.

[0036] In some embodiments, the charge and discharge system switches between a first stage and a second stage; in the first stage, the voltage output by the battery pack charges at least part of the first coils through the first control circuit; in the second stage, the charged first coils discharge through the first control circuit.

[0037] The third control circuit is configured to connect the first coil of the i-th phase and the second arm of the i-th phase through the control unit of the i-th phase when a fault occurs in the first arm of the i-th phase and no fault occurs in the second arm of the i-th phase.

[0038] In some embodiments, the first neutral point is also connected to the positive extreme of the charging and discharging port, and the negative extreme of the battery pack is connected to the negative extreme of the charging and discharging port. The charging and discharging system further includes switching between a third stage and a fourth stage; in the third stage, the voltage provided by the charging and discharging port charges at least part of the first coil through the first control circuit; in the fourth stage, the charged first coil discharges through the first control circuit.

[0039] The third control circuit is configured to connect the first coil of the i-th phase and the second arm of the i-th phase through the control unit of the i-th phase when a fault occurs in the first arm of the i-th phase and no fault occurs in the second arm of the i-th phase.

[0040] In some embodiments, the third control circuit is configured to parallel the faulty half-bridge of the first arm of the i-th phase with the corresponding half-bridge of the second arm of the i-th phase through the control unit of the i-th phase when a fault occurs in the half-bridge where the first arm of the i-th phase needs to be turned on and no fault occurs in the corresponding half-bridge of the second arm of the i-th phase.

[0041] In some embodiments, in the first stage, the battery pack charges the first coil of the i-th phase through the first control circuit. The third control circuit is configured to turn on the control unit of the i-th phase when a fault occurs in the lower half-bridge of the first arm of the i-th phase and no fault occurs in the lower half-bridge of the second arm of the i-th phase, so that the current flows from the positive extreme of the battery pack, through the first coil of the i-th phase, the control unit of the i-th phase, the lower half-bridge of the second arm of the i-th phase, to the negative extreme of the battery pack, forming a loop.

[0042] In some embodiments, in the second stage, the charged first coil of the i-th phase discharges to the battery pack. The third control circuit is configured to turn on the control unit of the i-th phase when a fault occurs in the upper half-bridge of the first arm of the i-th phase and no fault occurs in the upper half-bridge of the second arm of the i-th phase, so that the current flows from the first end of the charged first coil of the i-th phase, through the control unit of the i-th phase, the upper half-bridge of the second arm of the i-th phase, the battery pack, to the second end of the first coil of the i-th phase, forming a loop.

[0043] In some embodiments, in the third stage, the voltage output by the charge-discharge port charges the first coil of the i-th phase through the first control circuit. The third control circuit is configured to, when a fault occurs in the lower half-bridge of the first arm of the i-th phase and no fault occurs in the lower half-bridge of the second arm of the i-th phase, turn on the control unit of the i-th phase, so that the current flows from the positive terminal of the charge-discharge port, through the first coil of the i-th phase, the control unit of the i-th phase, and the lower half-bridge of the second arm of the i-th phase in sequence, and then to the negative terminal of the charge-discharge port to form a loop.

[0044] In some embodiments, in the fourth stage, the charged first coil of the i-th phase discharges to the battery pack. The third control circuit is configured to, when a fault occurs in the upper half-bridge of the first arm of the i-th phase and no fault occurs in the upper half-bridge of the second arm of the i-th phase, turn on the control unit of the i-th phase, so that the current flows from the first end of the charged first coil of the i-th phase, through the control unit of the i-th phase, the upper half-bridge of the second arm of the i-th phase, and the battery pack in sequence, and then to the second end of the first coil of the i-th phase to form a loop.

[0045] In some embodiments, the charge-discharge system further includes a first switch module. The first end of the first switch module is connected to the first neutral point, and the second end of the first switch module is connected to the positive terminal of the battery pack and the first end of the first arm of the M-th phase. The first switch module is configured to close when the voltage output by the battery pack charges the first coil.

[0046] In some embodiments, the charge-discharge system further includes a second switch module. The first end of the second switch module is connected to the first neutral point, and the second end of the second switch module is connected to the negative terminal of the battery pack and the second end of the first arm of the M-th phase. The second switch module is configured to close when the charged first coil discharges to the battery pack.

[0047] In some embodiments, the control unit includes at least one of a MOS transistor, a transistor and a diode connected in parallel, or a control switch.

[0048] The present invention also provides a vehicle. The vehicle includes: a charge-discharge system provided in any of the above embodiments.

[0049] The vehicle has the same structure and beneficial effects as the charge-discharge system described in any of the above embodiments, and will not be described in detail here.

[0050] In some embodiments, the vehicle further includes a charge-discharge port. The positive terminal of the charge-discharge port is connected to the positive terminal of the battery pack, and the negative terminal of the charge-discharge port is connected to the negative terminal of the battery pack. Description of the Drawings

[0051] To more clearly illustrate the technical solutions of the embodiments of the present application, the accompanying drawings required for the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0052] Figure 1 It is a structural block diagram of a drive system according to some embodiments;

[0053] Figure 2 It is a circuit structure diagram of a drive system according to some embodiments;

[0054] Figure 3 It is a structural block diagram of a drive system according to some other embodiments;

[0055] Figure 4 It is a circuit structure diagram of a drive system according to some other embodiments;

[0056] Figure 5 It is a circuit structure diagram of a drive system according to some other embodiments;

[0057] Figure 6 It is Figure 5 A diagram of a current flow direction during the driving process of the drive system shown;

[0058] Figure 7 It is Figure 5 Another diagram of a current flow direction during the driving process of the drive system shown;

[0059] Figure 8 It is Figure 5 Another diagram of a current flow direction during the driving process of the drive system shown;

[0060] Figure 9 It is Figure 5 Another diagram of a current flow direction during the driving process of the drive system shown;

[0061] Figure 10 It is Figure 5 Another diagram of a current flow direction during the driving process of the drive system shown;

[0062] Figure 11 It is Figure 5 Another diagram of a current flow direction during the driving process of the drive system shown;

[0063] Figure 12 It is a circuit structure diagram of a charge and discharge system according to some embodiments;

[0064] Figure 13 It is Figure 12A current flow diagram of the charging and discharging system shown in the first stage;

[0065] Figure 14 is Figure 12 Another current flow diagram of the charging and discharging system shown in the first stage;

[0066] Figure 15 is Figure 5 A current flow diagram of the charging and discharging system shown in the first stage;

[0067] Figure 16 is a circuit structure diagram of the charging and discharging system according to some other embodiments;

[0068] Figure 17 is a circuit structure diagram of the charging and discharging system according to some other embodiments. Detailed implementation manners

[0069] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0070] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", "inner", "outer", etc. is based on the orientation or relative positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. Without special instructions, in the case of satisfying the relative positional relationship shown in the drawings, the above-described orientation description can be flexibly set during the actual application process.

[0071] The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0072] In the description of the present invention, it should be noted that, unless otherwise clearly specified and defined, the terms "installed", "connected", "electrically connected", and "communicated" should be understood in a broad sense. For example, it can be a fixed electrical connection, a detachable electrical connection, or an integral electrical connection. It can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0073] In the embodiments of the present invention, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or also includes elements inherent to such process, article or device. Without further limitation, an element defined by the phrase "comprising a..." does not exclude the existence of additional identical elements in the process, article or device comprising the element.

[0074] In the embodiments of the present invention, words such as "exemplary" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present invention should not be construed as being more preferred or having more advantages than other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present relevant concepts in a specific manner.

[0075] In the description of this specification, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0076] In some embodiments, the vehicle includes a drive system, such as Figure 1 as shown, the drive system includes: a first drive component and a second drive component. The first drive component includes a first control circuit and a first motor, and the first control circuit is connected between the power supply and the first motor. The second drive component includes a second control circuit and a second motor, and the second control circuit is connected between the power supply and the second motor.

[0077] When the power supply is a DC power supply and the first motor and the second motor are AC drive motors, the first control circuit is configured to convert the DC current provided by the power supply into an AC current and transmit the converted AC current to the first motor; the second control circuit is configured to convert the DC current provided by the power supply into an AC current and transmit the converted AC current to the second motor.

[0078] Exemplarily, the first control circuit and the second control circuit can be inverters.

[0079] In some embodiments, such asFigure 2 As shown, the drive system further includes: a fifth switch module K5, and / or, a sixth switch module K6.

[0080] One end of the fifth switch module K5 is connected to the first pole of the power supply, and the other end of the fifth switch module K5 is connected to the first end of the first control circuit. The fifth switch module K5 is used to control the on / off between the first pole of the power supply and the first end of the first control circuit.

[0081] By controlling the fifth switch module K5 to be closed or open, the output of the power supply to the first control circuit can be controlled to control the power supply to the first motor.

[0082] One end of the sixth switch module K6 is connected to the first pole of the power supply, and the other end of the sixth switch module K6 is connected to the first end of the second control circuit. The sixth switch module K6 is used to control the on / off between the first pole of the power supply and the first end of the second control circuit.

[0083] By controlling the sixth switch module K6 to be closed or open, the output of the power supply to the second control circuit can be controlled to control the power supply to the second motor.

[0084] In some embodiments, as Figure 2 shown, the first control circuit includes an M-phase first bridge arm, where M is a positive integer greater than or equal to 2. The first end and the second end of each phase of the first bridge arm are respectively and correspondingly connected to the first pole and the second pole of the power supply.

[0085] Exemplarily, the first pole of the power supply can be the positive pole of the power supply, and correspondingly, the second pole of the power supply is the negative pole of the power supply.

[0086] As Figure 2 shown, the first motor includes an M-phase first coil, and the second ends of the M-phase first coils L1 of the first motor are commonly connected to a first neutral point N1. As Figure 2 shown, the second control circuit includes an M-phase second bridge arm, and the first end and the second end of each phase of the second bridge arm are respectively and correspondingly connected to the first pole and the second pole of the power supply.

[0087] As Figure 2 shown, the second motor includes an M-phase second coil, and each phase of the second bridge arm is further connected to the first end of the second coil L2. The second ends of the M-phase second coils L2 of the second motor are commonly connected to a second neutral point N2.

[0088] In some embodiments, both the first bridge arm and the second bridge arm include an upper half-bridge and a lower half-bridge connected in series. The common connection end of the upper half-bridge and the lower half-bridge of the first bridge arm is connected to the first coil L1, and the common connection end of the upper half-bridge and the lower half-bridge of the second bridge arm is connected to the second coil L2.

[0089] The common connection terminals of the upper and lower half-bridges of the first arm of the i-th phase are connected to the first coil of the i-th phase, and the common connection terminals of the upper and lower half-bridges of the second arm of the i-th phase are connected to the second coil of the i-th phase, where 1 ≤ i ≤ M.

[0090] Exemplarily, as Figure 2 shown, the upper half-bridge of the first arm of each phase includes a first switching element VT1, and the lower half-bridge of the first arm of each phase includes a second switching element VT2. The first end of the first switching element VT1 is connected to the first end of the first arm, the second end of the first switching element VT1 is connected to the first end of the second switching element VT2, and the second end of the second switching element VT2 is connected to the second end of the first arm.

[0091] The first end of the first coil L1 of one phase is connected to the common connection terminal of the first switching element VT1 and the second switching element VT2 of the first arm of one phase.

[0092] Exemplarily, as Figure 2 shown, the upper half-bridge of the second arm of each phase includes a third switching element VT3, and the lower half-bridge of the second arm of each phase includes a fourth switching element VT4. The first end of the third switching element VT3 is connected to the first end of the second arm, the second end of the third switching element VT3 is connected to the first end of the fourth switching element VT4, and the second end of the fourth switching element VT4 is connected to the second end of the second arm.

[0093] The first end of the second coil L2 of one phase is connected to the common connection terminal of the third switching element VT3 and the fourth switching element VT4 of the second arm of one phase.

[0094] In the control circuit in the embodiments of the present application, for example, one switching element (the first switching element VT1, the second switching element VT2, the third switching element VT3, or the fourth switching element VT4) in the first control circuit or the second control circuit may include a MOS transistor (Metal-Oxide-Semiconductor Field-Effect Transistor), or one switching element may further include a transistor and a diode connected in parallel.

[0095] For example, in the case where one switching element includes a MOS transistor, in the first arm of each phase of the first control circuit, the first pole of the MOS transistor included in the first switching element VT1 is connected to the first end of the first arm, the second pole of the MOS transistor included in the first switching element VT1 is connected to the first pole of the MOS transistor of a second switching element VT2, and the second pole of the MOS transistor of the second switching element VT2 is connected to the second end of the first arm; the common connection terminal of the MOS transistor included in a first switching element VT1 and the MOS transistor of a second switching element VT2 is connected to the first coil L1 of one phase.

[0096] Based on this, by controlling the on-off of the MOS tube included in the first switching element VT1 and the second control element VT2, the on-off between the first control circuit and the first motor can be controlled; and by controlling the conduction direction of the MOS tube included in the first switching element VT1 and the second control element VT2, the direction of the current flowing through the first coil L1 connected to the first bridge arm can be controlled.

[0097] In the case where a switching element comprises a transistor and a diode connected in parallel, such as Figure 2 As shown, the first end of the diode is connected to the second end of the transistor, and the second end of the diode is connected to the first end of the transistor. The first end of a transistor and the second end of a diode are both connected to the first end of a phase bridge arm of the control circuit, and the second end of a transistor and the first end of a diode are both connected to the second end of a phase bridge arm of the control circuit.

[0098] When the transistor is turned on, the first end to the second end of the transistor is turned on, and in other cases, the transistor is considered to be open; the first end to the second end of the diode is turned on, and the second end to the first end of the diode is cut off (considered to be open); and in each switch element, the transistor and the diode are turned on in time. In this case, the transistor can be an IGBT (Insulated Gate Bipolar Transistor).

[0099] In some embodiments, the vehicle further includes a controller, which is connected to the control terminals of a plurality of switch elements of the control circuit (the first control circuit or the second control circuit). By controlling the on and off of the transistor and the diode, the conduction direction of the switch element can be controlled. When the transistor is turned on and the diode is turned off, the switch element is turned on from the first terminal to the second terminal; when the transistor is turned off and the diode is turned on, the switch element is turned on from the second terminal to the first terminal.

[0100] During the driving of the vehicle, the control circuit can convert the DC power provided by the power source (such as the battery pack) into power and provide it to the motor to drive the motor to work.

[0101] During the driving of the vehicle, when both the first control circuit and the second control circuit are in good condition, the power supply supplies power to the first motor through the first control circuit, and the power supply supplies power to the second motor through the second control circuit.

[0102] During this process, in the M-phase first bridge arm of the first motor, the upper half of the first bridge arm of the first part is turned on and the lower half is turned off; the upper half of the first bridge arm of the other part is turned off and the lower half is turned on.

[0103] The current flows from the first pole of the power supply, successively through the upper half-bridge of a part of the first arm, the first coil L1 connected to the upper half-bridge of this part of the first arm, the first neutral point N1, the other part of the first coil L1, the lower half-bridge of the other part of the first arm, to the negative pole of the power supply, forming a loop.

[0104] Correspondingly, in the M-phase second arm of the second motor, the upper half-bridge of the first part of the second arm is turned on and the lower half-bridge is turned off; the upper half-bridge of the other part of the second arm is turned off and the lower half-bridge is turned on.

[0105] The current flows from the first pole of the power supply, successively through the upper half-bridge of a part of the second arm, the second coil L2 connected to the upper half-bridge of this part of the second arm, the second neutral point N2, the other part of the second coil L2, the lower half-bridge of the other part of the second arm, to the negative pole of the power supply, forming a loop.

[0106] Based on this, in some embodiments, the M-phase first arm includes a first sub-arm and a second sub-arm, and the M-phase first coil includes a first sub-coil and a second sub-coil.

[0107] The M-phase second arm includes a third sub-arm and a fourth sub-arm, and the M-phase second coil includes a third sub-coil and a fourth sub-coil.

[0108] Exemplarily, during vehicle driving, the upper half-bridge of the first sub-arm is turned on and the lower half-bridge is turned off; the upper half-bridge of the second sub-arm is turned off and the lower half-bridge is turned on.

[0109] When a part of the arm in the control circuit fails, it can be to disconnect the faulty arm. In this way, the motor coil connected to the disconnected arm does not participate in the motor operation. This method is equivalent to single-phase loss control for the motor, and the current normally flowing through the three phases increases, and it operates at high power for a short time, which easily affects the motor life. Seriously, it directly controls the motor to stop, which will lead to a decrease in the vehicle's power and low reliability.

[0110] When a part of the arm in the control circuit fails, or all arms fail, the motor connected to the control circuit is turned off, and the motor no longer participates in the vehicle driving process. In this way, the output power of the drive will be reduced, and the dynamic performance of the vehicle will deteriorate.

[0111] Based on the foregoing embodiments, the present application provides a drive system.

[0112] In some embodiments, as Figure 3 and Figure 4 shown, the drive system further includes a third control circuit. The third control circuit includes an M-phase control unit. The first coil of the i-th phase is connected to the first end of the i-th phase control unit, and the second coil of the i-th phase is connected to the second end of the i-th phase control unit.

[0113] The third control circuit is configured to connect the first coil of the ith phase to the second bridge arm of the ith phase through the ith phase control unit, or connect the second coil of the ith phase to the first bridge arm of the ith phase through the ith phase control unit.

[0114] By providing the third control circuit, in the case where at least one of the first control circuit and the second control circuit fails, the control unit in the third control circuit can connect the motor connected to the faulty control circuit to the non-faulty part of the other control circuit.

[0115] By providing the third control circuit, the faulty part of any one of the first control circuit and the second control circuit can be connected to the non-faulty part of the other, and the non-faulty part replaces the faulty part to ensure that the drive system can operate normally.

[0116] Exemplarily, the number of first bridge arms in the first control circuit is the same as the number of first coils in the first motor, and the number of second bridge arms in the second control circuit is the same as the number of second coils in the second motor.

[0117] Based on the foregoing embodiments, the control unit is used to control the on / off of the first control circuit and the second control circuit. Specifically, the control unit may include a switching element having a switching function.

[0118] The power of the switching elements in the first control circuit and the second control circuit may be the same. In some embodiments, the power of the switching element of the control unit may be the same as the power of the switching elements in the first control circuit and the second control circuit.

[0119] In this way, even if the motor in the drive system operates at a high frequency, when some switching elements in the control circuit fail, the control unit can quickly respond according to the motor operation condition and conduct or cut off in a timely manner.

[0120] In some other embodiments, the control unit is a relay or other component having a switching function.

[0121] In some embodiments, such as Figure 4 and Figure 5 shown, the control unit includes at least one of: a MOS transistor, a parallel-connected transistor and diode, or a control switch.

[0122] Such as Figure 4 shown, the first pole of the MOS transistor is connected to the common connection end of the first bridge arm of one phase and the corresponding first coil, and the second pole of the MOS transistor is connected to the common connection end of the second bridge arm of one phase and the corresponding second coil.

[0123] Such as Figure 4As shown, the first transistor and the first diode are connected in parallel between the common connection end of the first bridge arm of a phase and the corresponding first coil, and the common connection end of the second bridge arm of a phase and the corresponding second coil.

[0124] As Figure 5 shown, the first pole of the control switch is connected to the common connection end of the first bridge arm of a phase and the corresponding first coil, and the second pole of the control switch is connected to the common connection end of the second bridge arm of a phase and the corresponding second coil.

[0125] In some embodiments, as Figure 4 and Figure 5 shown, the third control circuit is configured to, when one of the first bridge arm of the i-th phase and the second bridge arm of the i-th phase has a fault and the other is conducting, make the coil connected to the faulty bridge arm among the first bridge arm of the i-th phase and the second bridge arm of the i-th phase communicate with the conducting bridge arm through the i-th phase control unit.

[0126] When one of the first bridge arm of the i-th phase and the second bridge arm of the i-th phase connected to the i-th phase control unit has a fault and the other is operating normally, the i-th phase control unit is turned on, so that the coil connected to the faulty bridge arm can form a loop with the power supply through the non-faulty bridge arm, ensuring the normal operation of the motor.

[0127] Specifically, the situation that the coil connected to the faulty bridge arm can form a loop with the power supply through the non-faulty bridge arm through the third control circuit includes but is not limited to the following cases.

[0128] For example, the i-th phase control unit is configured to, when the upper half bridge of the first bridge arm of the i-th phase connected to the i-th phase control unit has a fault or is turned off and the upper half bridge of the second bridge arm of the i-th phase connected to the i-th phase control unit is conducting, make the first coil of the i-th phase connected to the upper half bridge of the first bridge arm of the i-th phase communicate with the upper half bridge of the second bridge arm of the i-th phase.

[0129] Another example is that the i-th phase control unit is configured to, when the lower half bridge of the first bridge arm of the i-th phase connected to the i-th phase control unit has a fault or is turned off and the lower half bridge of the second bridge arm of the i-th phase connected to the i-th phase control unit is conducting, make the first coil of the i-th phase connected to the lower half bridge of the first bridge arm of the i-th phase communicate with the lower half bridge of the second bridge arm of the i-th phase.

[0130] Another example is that the i-th phase control unit is configured to, when the upper half bridge of the second bridge arm of the i-th phase connected to the i-th phase control unit has a fault or is turned off and the upper half bridge of the first bridge arm of the i-th phase connected to the i-th phase control unit is conducting, make the second coil of the i-th phase connected to the upper half bridge of the second bridge arm of the i-th phase communicate with the upper half bridge of the first bridge arm of the i-th phase.

[0131] For another example, the i-th phase control unit is configured to connect the i-th phase second coil connected to the lower half-bridge of the i-th phase second armature to the lower half-bridge of the i-th phase first armature when a fault occurs in or the lower half-bridge of the i-th phase second armature connected to the i-th phase control unit is turned off and the lower half-bridge of the i-th phase first armature connected to the i-th phase control unit is turned on.

[0132] In some other embodiments, such as Figure 4 and Figure 5 as shown, when a fault occurs in the upper half-bridge of one of the i-th phase first armature and the i-th phase second armature and the upper half-bridge of the other is turned on, the i-th phase control unit is used to connect the turned-on upper half-bridge in the i-th phase first armature and the i-th phase second armature in parallel with the faulty upper half-bridge; and / or, the third control circuit is configured to, when a fault occurs in the lower half-bridge of one of the i-th phase first armature and the i-th phase second armature and the lower half-bridge of the other is turned on, connect the turned-on lower half-bridge in the i-th phase first armature and the i-th phase second armature in parallel with the faulty lower half-bridge through the i-th phase control unit.

[0133] When no fault occurs in either the first armature or the second armature connected to the control unit, one of the first armature and the second armature can also be turned off and the control unit can be turned on. Specifically, it can be adaptively designed according to actual needs as long as it can ensure that the M-phase coils of the motor can all work properly. The present application does not make any limitation in this regard.

[0134] Based on the foregoing embodiments, in some embodiments, such as Figure 4 and Figure 5 as shown, the third control circuit is configured to, when a fault occurs in the i-th phase first armature, the i-th phase second armature is normally turned on, a fault occurs in the j-th phase second armature, and the j-th phase first armature is normally turned on, connect the i-th phase first coil to the i-th phase second armature through the i-th phase control unit, and connect the j-th phase second coil to the j-th phase first armature through the j-th phase control unit; 1 ≤ j ≤ M, and i is not equal to j.

[0135] Based on the foregoing embodiments, when a fault occurs in the upper half-bridge of one of the i-th phase first armature and the i-th phase second armature and the upper half-bridge of the other is turned on, the lower half-bridge of the one with the faulty upper half-bridge in the i-th phase first armature and the i-th phase second armature is free of faults.

[0136] Alternatively, when a fault occurs in the upper half-bridge of one of the i-th phase first armature and the i-th phase second armature and the upper half-bridge of the other is turned on, the lower half-bridge of the one with the faulty upper half-bridge in the i-th phase first armature and the i-th phase second armature is open-circuited.

[0137] When there is a fault in the lower half bridge of one of the first arm and the second arm of the i-th phase, and the lower half bridge of the other is conducting, the upper half bridge of the one with the fault in the lower half bridge of the first arm and the second arm of the i-th phase is free of faults.

[0138] Alternatively, when there is a fault in the lower half bridge of one of the first arm and the second arm of the i-th phase, and the lower half bridge of the other is conducting, the upper half bridge of the one with the fault in the lower half bridge of the first arm and the second arm of the i-th phase is open-circuited.

[0139] Based on the foregoing embodiments, the drive system of the present application can connect a part of the first arm in parallel to both ends of a part of the second arm by controlling the conduction direction of the control unit in the third control circuit, so that while the first control circuit realizes the control of the first motor, a part of the first control circuit can also be reused to realize the control of the second motor.

[0140] Alternatively, connect a part of the second arm in parallel to both ends of a part of the first arm, so that while the second control circuit realizes the control of the second motor, a part of the second control circuit can also be reused to realize the control of the first motor.

[0141] In this way, even if there is a fault in the first control circuit and / or the second control circuit, the control unit can connect the non-faulty arm in parallel to both ends of the faulty arm to replace the faulty arm to participate in the motor drive process, ensuring that the motor can work in a normal state.

[0142] In some embodiments, as Figure 4 and Figure 5 shown, the third control circuit is configured to, when the upper half bridge of one of the first arm and the second arm of the i-th phase is turned off and the upper half bridge of the other is conducting, make the conducting upper half bridge of the first arm and the second arm of the i-th phase be connected in parallel with the turned-off upper half bridge through the i-th phase control unit; and / or,

[0143] The third control circuit is configured to, when the lower half bridge of one of the first arm and the second arm of the i-th phase is turned off and the lower half bridge of the other is conducting, make the conducting lower half bridge of the first arm and the second arm of the i-th phase be connected in parallel with the turned-off lower half bridge through the i-th phase control unit.

[0144] On the basis of the foregoing embodiments, when both the first control circuit and the second control circuit are free of faults, some bridge arms of the first control circuit or the second control circuit can also be turned off, and the motor coil connected to the turned-off bridge arm is connected to the conducting bridge arm through the control unit, so that the motor can work normally.

[0145] In some embodiments, as Figure 4 andFigure 5 As shown, the first arm of the M-phase includes a first sub-arm and a second sub-arm, the first coil of the M-phase includes a first sub-coil and a second sub-coil, the first sub-coil, the upper half-bridge and the lower half-bridge of the first sub-arm are commonly connected to a first node, and the second sub-coil, the upper half-bridge and the lower half-bridge of the second sub-arm are commonly connected to a second node.

[0146] The second arm of the M-phase includes a third sub-arm and a fourth sub-arm, the second coil of the M-phase includes a third sub-coil and a fourth sub-coil, the third sub-coil, the upper half-bridge and the lower half-bridge of the third sub-arm are commonly connected to a third node, and the fourth sub-coil, the upper half-bridge and the lower half-bridge of the fourth sub-arm are commonly connected to a fourth node.

[0147] The M control units include a first control unit and a second control unit, the first control unit is connected between the first node and the third node, and the second control unit is connected between the second node and the fourth node.

[0148] The first sub-arm and the third sub-arm are used to input the current output from the first pole of the power supply to the motor coil, and the second sub-arm and the fourth sub-arm are used for current return (from the motor to the battery).

[0149] In the case where neither the first control circuit nor the second control circuit has a fault, the current output from the positive pole of the power supply can flow through the upper half-bridge of the first sub-arm to the first node, then through the first sub-coil to the first neutral point N1, then through the second sub-coil to the second node, and then through the lower half-bridge of the second sub-arm and back to the negative pole of the power supply.

[0150] At the same time, the current output from the positive pole of the power supply can flow through the upper half-bridge of the third sub-arm to the third node, then through the third sub-coil to the second neutral point N2, then through the fourth sub-coil to the fourth node, and then through the lower half-bridge of the fourth sub-arm and back to the negative pole of the power supply.

[0151] During this process, if the first control circuit and the second control circuit have faults, the control unit can connect the non-faulty arm in parallel to both ends of the faulty arm to replace the faulty arm to participate in the motor driving process, ensuring that the motor can work in a normal state.

[0152] Specifically, in some embodiments, as Figure 4 and Figure 5 shown, the first control unit is configured to, when the upper half-bridge of the first sub-arm has a fault or is turned off and the upper half-bridge of the third sub-arm is conducting, connect the first sub-coil to the upper half-bridge of the third sub-arm so that the current flowing through the upper half-bridge of the third sub-arm passes through the first control unit to the first sub-coil.

[0153] In some other embodiments, the first control unit is configured to connect the third sub-coil to the upper half-bridge of the first sub-arm when a fault occurs in or the upper half-bridge of the third sub-arm is turned off and the upper half-bridge of the first sub-arm is conducting, so that the current flowing through the upper half-bridge of the first sub-arm passes through the first control unit to the third sub-coil.

[0154] By controlling the conduction direction of the first control unit, the upper half-bridge of the third sub-arm is connected in parallel to both ends of the upper half-bridge of the first sub-arm. In this way, the upper half-bridge of the third sub-arm without a fault can replace the upper half-bridge of the first sub-arm with a fault, ensuring that a current can flow through the first sub-coil in a preset direction.

[0155] In some embodiments, as Figure 4 and Figure 5 shown, the second control unit is configured to connect the second sub-coil to the lower half-bridge of the fourth sub-arm when a fault occurs in or the lower half-bridge of the second sub-arm is turned off and the lower half-bridge of the fourth sub-arm is conducting, so that the current flows through the second sub-coil, the second control unit, and the lower half-bridge of the fourth sub-arm in sequence to the second pole of the power supply.

[0156] In some other embodiments, the second control unit is configured to connect the fourth sub-coil to the lower half-bridge of the second sub-arm when a fault occurs in or the lower half-bridge of the fourth sub-arm is turned off and the lower half-bridge of the second sub-arm is conducting, so that the current flows through the fourth sub-coil, the second control unit, and the lower half-bridge of the second sub-arm in sequence to the second pole of the power supply.

[0157] By controlling the conduction direction of the second control unit, the lower half-bridge of the fourth sub-arm is connected in parallel to both ends of the lower half-bridge of the second sub-arm. In this way, the lower half-bridge of the fourth sub-arm without a fault can replace the lower half-bridge of the third sub-arm with a fault, ensuring that the current can flow back to the second pole of the power supply through the second sub-coil.

[0158] The present application also provides a control method for a drive system, which is applied to the drive system provided in any of the above embodiments.

[0159] The control method for the drive system of the present application includes:

[0160] When a fault occurs in the first control circuit, the third control circuit connects the faulty part of the first control circuit to the non-faulty part of the second control circuit, so that the power supply supplies power to the first motor through the non-faulty part of the first control circuit, the part of the second control circuit connected to the first control circuit, and the third control circuit, or the power supply supplies power to the first motor through the second control circuit and the third control circuit.

[0161] When there is a faulty phase in the second control circuit, the third control circuit connects the faulty part of the second control circuit to the non-faulty part of the first control circuit, so that the power supply supplies power to the second motor through the connected part of the first control circuit and the second control circuit, the non-faulty part of the second control circuit, and the third control circuit, or the power supply supplies power to the second motor through the first control circuit and the third control circuit.

[0162] Exemplarily, in the drive system, the fault states of the first arm of phase M in the first control circuit and the second arm of phase M in the second control circuit can be determined by detecting current signals. When it is found that at least one of the first control circuit and the second control circuit has a short-circuit or open-circuit fault, the pulse of the faulty-phase arm can be stopped to disconnect the faulty-phase arm, and at the same time, the corresponding control unit can be controlled to conduct to ensure the normal driving of the motor with the faulty phase.

[0163] The following takes the first motor and the second motor working in the same state. For example, both the first motor and the second motor include three-phase coils, and some possible implementation manners of the present application will be described.

[0164] In some embodiments, the first motor includes two-phase first sub-coils and one-phase second sub-coils, and the second motor includes two-phase third sub-coils and one-phase fourth sub-coils.

[0165] As Figures 6 to 11 shown, in the first control circuit, the two first arms on the left are two-phase first sub-arms, and the one first arm on the right is one-phase second sub-arm.

[0166] In the second control circuit, the two second arms on the left are two-phase third sub-arms, and the one first arm on the right is one-phase fourth sub-arm.

[0167] As Figure 6 shown, a fault occurs in one second arm of the second control circuit, and the other two second arms are normal.

[0168] The switching element VT1 of the two-phase first sub-arm of the first control circuit is turned on, and the switching element VT2 is turned off; the switching element VT1 of the second sub-arm is turned off, and the switching element VT2 is turned on.

[0169] The switching element VT3 of the non-faulty third sub-arm of the second control circuit is turned on, and the switching element VT4 is turned off. The switching elements of the faulty third sub-arm are all turned off; the switching element VT1 of the fourth sub-arm is turned off, and the switching element VT2 is turned on.

[0170] At this time, by controlling the first control unit to conduct, as Figure 6As shown, a part of the current flows from the first pole of the power supply, successively through the upper half-bridge of the first sub-bridge arm, the first sub-coil, the first neutral point N1, the second sub-coil, the lower half-bridge of the second sub-bridge arm, to the second pole of the power supply, forming a loop.

[0171] As Figure 6 shown, a part of the current flows from the first pole of the power supply, successively through the upper half-bridge of the third sub-bridge arm and the first sub-coil to the second neutral point N2, and another part of the current flows from the first pole of the power supply, successively through the upper half-bridge of the first sub-bridge arm, the first control unit, and the first sub-coil to the second neutral point N2; then, the current flows from the second neutral point N1, successively through the fourth sub-coil and the lower half-bridge of the fourth sub-bridge arm, to the second pole of the power supply, forming a loop.

[0172] As Figures 7 to 11 shown, as Figure 6 shown, when a fault occurs in the second bridge arm of the M phase (two phases or more) of the second control circuit, and when there is a single-phase or multi-phase (two phases or more) fault in the first control circuit, the same principle applies, and details are not elaborated here.

[0173] The drive system provided by some embodiments of the present application can, by setting a third control circuit, conduct the faulty phase in the first control circuit and the second control circuit with the non-faulty phases, enabling both the first motor and the second motor to be normally driven, avoiding a reduction in the power output of the entire vehicle, and ensuring the reliability of the drive system.

[0174] In some embodiments, the vehicle includes a charge-discharge system and a battery pack, and the charge-discharge system is used to charge the battery pack in the vehicle.

[0175] As Figure 12 shown, the charge-discharge system includes a first drive assembly, and the first drive assembly includes a first control circuit and a first motor. The first control circuit is connected between the battery pack and the first motor.

[0176] The first control circuit includes an M-phase first bridge arm, where M is a positive integer greater than or equal to 2. The first end and the second end of each phase of the first bridge arm are respectively connected to the positive terminal and the negative terminal of the battery pack.

[0177] The first motor includes an M-phase first coil. The common connection end of the upper half-bridge and the lower half-bridge of the i-th phase of the first bridge arm is connected to the first end of the i-th phase of the first coil; 1 ≤ i ≤ M.

[0178] The second ends of the M-phase first coils are commonly connected to a first neutral point, the positive terminal of the battery pack is connected to the first neutral point, and the negative terminal of the battery pack is connected to the first neutral point.

[0179] Exemplarily, the control unit includes at least one of a MOS transistor, a transistor and a diode connected in parallel, or a control switch.

[0180] At the positive extreme of the battery pack in a low-temperature environment, for example, when the ambient temperature of the vehicle is lower than the lowest value of the optimal operating temperature range of the battery pack, in this case, the capacity of the battery pack will decrease due to the influence of temperature, and the output and service life of the battery pack will also be affected.

[0181] Based on this, the battery pack can be selectively heated as needed to improve the output performance of the battery pack and extend its service life.

[0182] When the battery pack is heated, the drive system includes switching between a first stage and a second stage. In the first stage, as Figure 13 and Figure 14 shown, at least part of the first coil in the M-phase first coil is charged. In the second stage, the charged first coil discharges to the battery pack.

[0183] During this process, the battery pack can be heated by the heat generated during its charge and discharge process, or the battery pack can also be heated by the heat generated by the motor coil during its charge and discharge.

[0184] In some embodiments, as Figure 12 shown, the charge and discharge system further includes a first switch module K1. The first end of the first switch module is connected to the first neutral point N1, and the second end of the first switch module K1 is connected to the positive extreme of the battery pack and the first end of the first leg of the M-phase first bridge arm.

[0185] The first switch module K1 is used to control the on / off between the first neutral point N1 and the positive extreme of the battery pack.

[0186] In some embodiments, as Figure 13 shown, the first switch module is configured to close when the voltage output by the battery pack charges the first coil.

[0187] For example, in the first stage, the first switch module K1 is configured to close, so that the current flows from the positive extreme of the battery pack, through the first switch module K1, the first coil L1, the lower half bridge of the first leg or the second leg connected to the first coil L1, to the negative extreme of the battery pack, forming a loop.

[0188] In this way, the battery pack charges the first coil L1 of the first motor in the first stage, and the current passes through the first coil L1 and the lower half bridge of the M-phase first leg of the first control circuit in sequence and returns to the negative extreme of the battery pack to form a charging loop to charge the coil of the first motor.

[0189] In the second stage, the charged first coil L1 discharges to the battery pack. The current output from the first end of the first coil L1 passes through the upper half bridge of the first leg connected to it and the battery pack in sequence and returns to the second end of the first coil L1, forming a loop.

[0190] By charging and discharging the battery pack in the first stage and the second stage, the battery pack generates heat during the charging and discharging process to achieve heating of the battery pack. At the same time, the first coil L1 of the first motor also generates heat during the charging and discharging process. By arranging the first coil L1 of the first motor around the battery pack, the heat generated by the first coil L1 during the charging and discharging process can also be used to heat the battery pack.

[0191] In some embodiments, as Figure 12 shown, the charging and discharging system further includes a second switch module K2. The first end of the second switch module K2 is connected to the first neutral point, and the second end of the first switch module is connected to the negative terminal of the battery pack and the second end of the upper half bridge of the M-phase first arm.

[0192] The second switch module K2 is used to control the on-off between the first neutral point N1 and the negative terminal of the battery pack.

[0193] Exemplarily, the second switch module K2 is configured to be closed in the case where the first coil L1 after charging discharges the battery pack.

[0194] As Figure 14 shown, in the first stage, the second switch module K2 is configured to be closed and at least part of the upper half bridge of the first arm is turned on, so that the current flows from the positive electrode of the battery pack, successively through at least part of the upper half bridge of the first arm, the first coil L1 connected to the turned-on first arm, and the second switch module K2, to the negative terminal of the battery pack, forming a loop.

[0195] Based on this, in the second stage, the first switch module is configured to be closed and the second switch module K2 is configured to be opened, so that the current flows from the second end of the first coil L1 after charging, successively through the first switch module K1, the battery pack, and the lower half bridge of the first arm connected to the first coil L1 after charging, to the first end of the first coil L1 after charging, forming a loop.

[0196] On this basis, if at least part of the first arm of the first control circuit fails, during the heating process of the battery pack described above, there may be a situation where some of the first arms that need to be turned on cannot be turned on, affecting the heating effect of the battery pack or preventing the battery pack from being heated normally.

[0197] Based on this, in some embodiments, as Figure 15 shown, the charging and discharging system further includes: a second driving component and a third control circuit. The second driving component includes a second control circuit and a second motor, and the second control circuit is connected between the battery pack and the second motor.

[0198] The second control circuit includes an M-phase second bridge arm. The first end and the second end of each phase of the second bridge arm are respectively and correspondingly connected to the positive extreme and the negative extreme of the battery pack. The second motor includes an M-phase first coil. The common connection end of the upper half bridge and the lower half bridge of the i-th phase second bridge arm is connected to the first end of the i-th phase second coil.

[0199] The third control circuit includes an M-phase control unit. The common connection end of the i-th phase first bridge arm and the i-th phase first coil is connected to the first end of the i-th phase control unit. The common connection end of the i-th phase second bridge arm and the i-th phase second coil is connected to the second end of the i-th phase control unit.

[0200] The third control circuit is configured to connect the i-th phase first coil to the i-th phase second bridge arm through the i-th phase control unit.

[0201] Exemplarily, the third control circuit is configured to connect the i-th phase first coil and the i-th phase second bridge arm through the i-th phase control unit when a fault exists in the i-th phase first bridge arm and no fault exists in the i-th phase second bridge arm.

[0202] For example, in the first stage, the battery pack charges the i-th phase first coil through the first control circuit. The third control circuit is configured to turn on the i-th phase control unit when a fault exists in the lower half bridge of the i-th phase first bridge arm and no fault exists in the lower half bridge of the i-th phase second bridge arm, so that the current flows from the positive extreme of the battery pack, sequentially through the i-th phase first coil, the i-th phase control unit, the lower half bridge of the i-th phase second bridge arm, to the negative extreme of the battery pack, forming a loop.

[0203] Again, for example, in the second stage, the charged i-th phase first coil discharges to the battery pack. The third control circuit is configured to turn on the i-th phase control unit when a fault exists in the upper half bridge of the i-th phase first bridge arm and no fault exists in the upper half bridge of the i-th phase second bridge arm, so that the current flows from the first end of the charged i-th phase first coil, sequentially through the i-th phase control unit, the upper half bridge of the i-th phase second bridge arm, the battery pack, to the second end of the i-th phase first coil, forming a loop.

[0204] In this way, when a fault exists in the first bridge arm that needs to be turned on in the first control circuit and the second bridge arm of the same phase in the second control circuit can be normally turned on, the control unit in the third control circuit turns on the faulty first bridge arm and the second bridge arm of the same phase, and connects the second bridge arm in parallel to both ends of the first bridge arm as a replacement, so as to ensure that all coils of the first motor can be normally connected to the battery pack.

[0205] In the first stage and the second stage, the current flowing through the first coil can form a loop with the battery pack through the first bridge arm in the same phase, or it can also form a loop with the battery pack through the second bridge arm in the same phase and the control unit. Specifically, it can be adaptively designed according to actual needs, as long as it can ensure that a complete loop can be formed for the motor coil that needs to be charged and discharged.

[0206] In some embodiments, as Figure 16 shown, the first neutral point is also connected to the positive extreme of the charge and discharge port, and the negative extreme of the battery pack is connected to the negative extreme of the charge and discharge port. The charge and discharge system also includes switching between the third stage and the fourth stage.

[0207] In the third stage, the voltage provided by the charge and discharge port charges at least part of the first coil through the first control circuit.

[0208] For example, in the third stage, the current flows from the positive extreme of the charge and discharge port, successively through the lower half bridge of the first bridge arm connected to the first coil L1, to the negative extreme of the charge and discharge port, forming a loop.

[0209] In the fourth stage, the charged first coil discharges through the first control circuit.

[0210] For example, in the fourth stage, the current flows from the first end of the charged first coil L1, successively through the upper half bridge of the first bridge arm connected to the charged first coil L1, the battery pack, and the second switch module K2, to the second end of the charged first coil L1, forming a loop.

[0211] On this basis, the first coil L1 of the first motor can be arranged around the battery pack. In this way, the heat generated during the charging and discharging processes of the first coil L1 in the third stage and the fourth stage can also be used to heat the battery pack. At the same time, in the fourth stage, during the process of the charged first coil L1 discharging to the battery pack, the battery pack will also generate heat during charging, thus jointly realizing the heating of the battery pack.

[0212] During this process, if at least part of the first bridge arm of the first control circuit fails, then during the aforementioned heating process of the battery pack, there may be a situation where some of the first bridge arms that need to be conducted cannot be conducted, affecting the heating effect of the battery pack or preventing the battery pack from being heated normally.

[0213] Based on this, in some embodiments, the third control circuit is configured to connect the first coil of the i-th phase and the second bridge arm of the i-th phase through the control unit of the i-th phase when the first bridge arm of the i-th phase fails and the second bridge arm of the i-th phase does not fail.

[0214] Exemplarily, the third control circuit is configured to, when a half-bridge that needs to be turned on in the first arm of the i-th phase has a fault and the corresponding half-bridge in the second arm of the i-th phase has no fault, make the faulty half-bridge in the first arm of the i-th phase be connected in parallel with the corresponding half-bridge in the second arm of the i-th phase through the control unit of the i-th phase.

[0215] For example, in the third stage, the voltage output from the charge and discharge port charges the first coil of the i-th phase through the first control circuit. The third control circuit is configured to, when the lower half-bridge of the first arm of the i-th phase has a fault and the lower half-bridge of the second arm of the i-th phase has no fault, turn on the control unit of the i-th phase so that the current flows from the positive terminal of the charge and discharge port, through the first coil of the i-th phase, the control unit of the i-th phase, and the lower half-bridge of the second arm of the i-th phase, to the negative terminal of the charge and discharge port to form a loop.

[0216] Again, for example, in the fourth stage, the charged first coil of the i-th phase discharges to the battery pack. The third control circuit is configured to, when the upper half-bridge of the first arm of the i-th phase has a fault and the upper half-bridge of the second arm of the i-th phase has no fault, turn on the control unit of the i-th phase so that the current flows from the first end of the charged first coil of the i-th phase, through the control unit of the i-th phase, the upper half-bridge of the second arm of the i-th phase, and the battery pack, to the second end of the first coil of the i-th phase to form a loop.

[0217] In this way, when the first arm that needs to be turned on in the first control circuit has a fault and the second arm of the same phase in the second control circuit can be turned on normally, through the control unit in the third control circuit, the faulty first arm is connected to the second arm of the same phase, and the second arm is connected in parallel to both ends of the first arm as a substitute, so as to ensure that the coils of the first motor can be normally connected to the battery pack.

[0218] In the third stage and the fourth stage, the current flowing through the first coil can form a loop through the first arm of the same phase, or it can also form a loop through the second arm of the same phase and the control unit. Specifically, it can be adaptively designed according to actual needs, as long as it can ensure that a complete loop can be formed for the motor coil that needs to be charged and discharged.

[0219] In some embodiments, as Figure 16 shown, the drive system further includes: a third switch module K3, and / or, a fourth switch module K4.

[0220] The first end of the third switch module K3 is connected to the first neutral point N1, and the second end of the third switch module K3 is connected to the positive terminal of the charge and discharge port.

[0221] The first end of the fourth switch module K4 is connected to the negative pole of the power supply, and the second end of the fourth switch module K4 is connected to the negative terminal of the charge and discharge port and the second end of the first arm of the M phase.

[0222] The third switch module K3 is used to control the on / off of the connection between the first neutral point N1 and the positive terminal of the charge / discharge port.

[0223] The fourth switch module K4 is used to control the on / off between the negative terminal of the battery pack and the negative terminal of the charge / discharge port.

[0224] In some embodiments, in the first stage, the third switch module K3 and the fourth switch module K4 are configured to be closed, so that the current flows from the positive terminal of the charge / discharge port, sequentially through the first coil L1, the lower half bridge of the first arm or the second arm connected to the first coil L1, to the negative terminal of the charge / discharge port, forming a loop.

[0225] Based on the foregoing embodiments, the drive system of the vehicle can also be reused as at least a part of the charge / discharge system, and electric energy is transmitted between the battery pack and the charge / discharge port through the drive system. The electric energy transmission between the battery pack and the charge / discharge port can be that an external power source charges the vehicle battery pack through the charge / discharge port, or the vehicle battery pack discharges externally through the charge / discharge port.

[0226] Based on the foregoing embodiments, in some embodiments of the charge / discharge system of the present application, during the process of heating the battery pack, it can be that only the first control circuit and the first motor are used to realize the self-heating of the battery pack, or the control unit can make at least part of the second arm of the second control circuit participate in the self-heating process of the battery pack.

[0227] During this process, regardless of whether the first control circuit has a fault, part of the arm of the first control circuit can be turned off, the corresponding phase of the control unit can be turned on, and the second arm of the control unit that is turned on can be turned on, so that a part of the second arm is connected in parallel to both ends of a part of the first arm, and the third control circuit is used for battery self-heating control to achieve function reuse and improve the utilization rate of the third control circuit.

[0228] In some embodiments of the charge / discharge system provided by the present application, when there is a faulty phase in the first control circuit, the self-heating efficiency of the battery pack will be affected or the self-heating function of the battery pack cannot be realized normally. Through the third control circuit, when there is a fault in the first arm in the first control circuit and there is no fault in the second arm of the same phase in the second control circuit, the corresponding arm in the second control circuit can be connected to the motor coil connected to the faulty phase of the first control circuit, so as to ensure that the first coil of the M phase of the first motor can be connected to the effective arm, ensure that the battery self-heating efficiency can be within the preset range, and ensure the battery heating effect.

[0229] In some embodiments, as Figure 16 shown, the charge / discharge system further includes: a fifth switch module K5, and / or, a sixth switch module K6.

[0230] One end of the fifth switch module K5 is connected to the first pole of the power supply, and the other end of the fifth switch module K5 is connected to the first end of the first control circuit. The fifth switch module K5 is configured to control the on / off between the first pole of the power supply and the first end of the first control circuit.

[0231] One end of the sixth switch module K6 is connected to the first pole of the power supply, and the other end of the sixth switch module K6 is connected to the first end of the second control circuit. The sixth switch module K6 is configured to control the on / off between the first pole of the power supply and the first end of the second control circuit. In some embodiments, as Figure 17 shown, in the charge and discharge system, the first end and the second end of the second control circuit may also be correspondingly connected to a charge and discharge port. In this way, the vehicle may have two charge and discharge ports. In this way, the connection manners of the first driving component and the second driving component are the same. During the self-heating process of the battery pack, the battery pack self-heating may also be realized through the second control circuit and the second coil. For the specific process, refer to the descriptions of the first stage and the second stage above, and details are not described herein again.

Claims

1. A drive system, characterized in that: include: A first driving component includes a first control circuit and a first motor; the first control circuit is connected between a power source and the first motor; The first control circuit includes an M-phase first bridge arm, the first motor includes an M-phase first coil, and the common end of the upper half bridge and the lower half bridge of the first bridge arm of the i-th phase is connected to the first coil of the i-th phase; M is a positive integer greater than or equal to 2, 1≤i≤M; A second driving component includes a second control circuit and a second motor; the second control circuit is connected between the power supply and the second motor; the second control circuit includes an M-phase second bridge arm, the second motor includes an M-phase second coil, and the common connection end of the upper half bridge and the lower half bridge of the second bridge arm of the i-th phase is connected to the second coil of the i-th phase; as well as A third control circuit includes an M-phase control unit; The first coil of the i-th phase is connected to the first end of the control unit of the i-th phase, and the second coil of the i-th phase is connected to the second end of the control unit of the i-th phase; The third control circuit is configured to connect the first coil of the i-th phase to the second bridge arm of the i-th phase through the i-th phase control unit, or to connect the second coil of the i-th phase to the first bridge arm of the i-th phase through the i-th phase control unit.

2. The drive system according to claim 1, characterized in that: The third control circuit is configured to connect the coil connected to the faulty bridge arm of the first bridge arm of the i-th phase and the second bridge arm of the i-th phase with the turned-on bridge arm through the i-th control unit when one of the first bridge arm of the i-th phase and the second bridge arm of the i-th phase is faulty and the other is turned on.

3. The drive system according to claim 2, characterized in that: The control unit of the i-th phase is configured to connect the first coil of the i-th phase connected to the upper half bridge of the first bridge arm of the i-th phase and the upper half bridge of the second bridge arm of the i-th phase when the upper half bridge of the first bridge arm of the i-th phase connected to the control unit of the i-th phase is faulty or shut down and the upper half bridge of the second bridge arm of the i-th phase connected to the control unit of the i-th phase is turned on.

4. The drive system according to claim 2, characterized in that: The control unit of the i-th phase is configured to connect the first coil of the i-th phase connected to the lower half bridge of the first bridge arm of the i-th phase and the lower half bridge of the second bridge arm of the i-th phase when the lower half bridge of the first bridge arm of the i-th phase connected to the control unit of the i-th phase is faulty or shut down and the lower half bridge of the second bridge arm of the i-th phase connected to the control unit of the i-th phase is turned on.

5. The drive system according to claim 2, characterized in that: The control unit of the i-th phase is configured to connect the second coil of the i-th phase connected to the upper half bridge of the second bridge arm of the i-th phase and the upper half bridge of the first bridge arm of the i-th phase when the upper half bridge of the second bridge arm of the i-th phase connected to the control unit of the i-th phase is faulty or shut down and the upper half bridge of the first bridge arm of the i-th phase connected to the control unit of the i-th phase is turned on.

6. The drive system according to claim 2, characterized in that: The control unit of the i-th phase is configured to connect the second coil of the i-th phase connected to the lower half bridge of the second bridge arm of the i-th phase and the lower half bridge of the first bridge arm of the i-th phase when the lower half bridge of the second bridge arm of the i-th phase connected to the control unit of the i-th phase is faulty or shut down and the lower half bridge of the first bridge arm of the i-th phase connected to the control unit of the i-th phase is turned on.

7. The drive system according to claim 1 or 2, characterized in that: When an upper half bridge of one of the first bridge arm of the i-th phase and the second bridge arm of the i-th phase is faulty and an upper half bridge of the other is turned on, the i-th phase control unit connects the turned-on upper half bridge of the first bridge arm of the i-th phase and the second bridge arm of the i-th phase in parallel with the upper half bridge with fault; and / or, The third control circuit is configured to, when there is a fault in the lower half bridge of one of the first bridge arm of the i-th phase and the second bridge arm of the i-th phase and the lower half bridge of the other is turned on, connect the turned-on lower half bridge of the first bridge arm of the i-th phase and the second bridge arm of the i-th phase in parallel with the faulty lower half bridge through the control unit of the i-th phase.

8. The drive system according to claim 7, characterized in that: In the case that an upper half bridge of one of the first bridge arm of the i-th phase and the second bridge arm of the i-th phase has a fault and an upper half bridge of the other is turned on, The lower half bridge of one of the first bridge arm of the i-th phase and the second bridge arm of the i-th phase with a fault in the upper half bridge does not have a fault; or The lower half bridge of one of the first bridge arm of the i-th phase and the second bridge arm of the i-th phase in which the upper half bridge is faulty is disconnected.

9. The drive system according to claim 7, characterized in that: In the case that the lower half bridge of one of the first bridge arm of the i-th phase and the second bridge arm of the i-th phase has a fault and the lower half bridge of the other is turned on, The upper half bridge of one of the first bridge arm of the i-th phase and the second bridge arm of the i-th phase with a fault in the lower half bridge does not have a fault; or The upper half bridge of one of the first bridge arm of the i-th phase and the second bridge arm of the i-th phase where the lower half bridge has a fault is broken.

10. The drive system according to claim 1 or 2, characterized in that: The third control circuit is configured to, when the upper half bridge of one of the first bridge arm of the i-th phase and the second bridge arm of the i-th phase is turned off and the upper half bridge of the other is turned on, connect the turned-on upper half bridge of the first bridge arm of the i-th phase and the turned-off upper half bridge in parallel through the control unit of the i-th phase; and / or, The third control circuit is configured to, when the lower half bridge of one of the first bridge arm of the i-th phase and the second bridge arm of the i-th phase is turned off and the lower half bridge of the other is turned on, connect the turned-on lower half bridge of the first bridge arm of the i-th phase and the turned-off lower half bridge in parallel through the control unit of the i-th phase.

11. The drive system according to claim 1 or 2, characterized in that: The third control circuit is configured to, when the first bridge arm of the i-th phase has a fault and the second bridge arm of the i-th phase is normally turned on, and when the second bridge arm of the j-th phase has a fault and the first bridge arm of the j-th phase is normally turned on, The first coil of the i-th phase and the second bridge arm of the i-th phase are connected through the control unit of the i-th phase, and the second coil of the j-th phase and the first bridge arm of the j-th phase are connected through the control unit of the j-th phase; 1≤j≤M, i is not equal to j.

12. The driving system according to any one of claims 1 to 6, characterized in that: The M-phase first bridge arm includes a first sub-bridge arm and a second sub-bridge arm, the M-phase first coil includes a first sub-coil and a second sub-coil, the first sub-coil, the upper half bridge and the lower half bridge of the first sub-bridge arm are connected to a first node, and the second sub-coil, the upper half bridge and the lower half bridge of the second sub-bridge arm are connected to a second node; The M-phase second bridge arm includes a third sub-bridge arm and a fourth sub-bridge arm, the M-phase second coil includes a third sub-coil and a fourth sub-coil, the third sub-coil, the upper half bridge and the lower half bridge of the third sub-bridge arm are connected to a third node, and the fourth sub-coil, the upper half bridge and the lower half bridge of the fourth sub-bridge arm are connected to a fourth node; The M control units include a first control unit and a second control unit, the first control unit is connected between the first node and the third node, and the second control unit is connected between the second node and the fourth node.

13. The drive system according to claim 12, characterized in that: The first control unit is configured to connect the first sub-coil with the upper half bridge of the third sub-bridge arm when there is a fault or shutdown in the upper half bridge of the first sub-bridge arm and the upper half bridge of the third sub-bridge arm is turned on, so that the current flowing through the upper half bridge of the third sub-bridge arm reaches the first sub-coil through the first control unit.

14. The drive system according to claim 12, characterized in that: The second control unit is configured to connect the second sub-coil with the lower half bridge of the fourth sub-bridge arm when there is a fault or shutdown in the lower half bridge of the second sub-bridge arm and the lower half bridge of the fourth sub-bridge arm is turned on, so that the current passes through the second sub-coil, the second control unit, the lower half bridge of the fourth sub-bridge arm, and reaches the second pole of the power supply in sequence.

15. The drive system according to claim 12, characterized in that: The first control unit is configured to connect the third sub-coil with the upper half bridge of the first sub-bridge arm when there is a fault or shutdown in the upper half bridge of the third sub-bridge arm and the upper half bridge of the first sub-bridge arm is turned on, so that the current flowing through the upper half bridge of the first sub-bridge arm reaches the third sub-coil through the first control unit.

16. The drive system according to claim 12, characterized in that: The second control unit is configured to connect the fourth sub-coil with the lower half bridge of the second sub-bridge arm when there is a fault or shutdown in the lower half bridge of the fourth sub-bridge arm and the lower half bridge of the second sub-bridge arm is turned on, so that the current passes through the fourth sub-coil, the second control unit, the lower half bridge of the second sub-bridge arm, and reaches the second pole of the power supply in sequence.

17. The driving system according to any one of claims 1 to 6, characterized in that: The control unit includes: a MOS tube, a transistor and a diode connected in parallel, or at least one of a control switch.

18. A charging and discharging system, characterized in that: include: A first driving assembly includes a first control circuit and a first motor; the first control circuit is connected between the battery pack and the first motor; The first control circuit includes an M-phase first bridge arm, where M is a positive integer greater than or equal to 2, and the first end and the second end of the first bridge arm of each phase are respectively connected to the positive terminal and the negative terminal of the battery pack; the first motor includes an M-phase first coil, and the common connection end of the upper half bridge and the lower half bridge of the first bridge arm of the i-th phase is connected to the first end of the first coil of the i-th phase; 1≤i≤M; the second ends of the M-phase first coils are commonly connected to a first neutral point, the positive terminal of the battery pack is connected to the first neutral point, and the negative terminal of the battery pack is connected to the first neutral point; The second driving component includes a second control circuit and a second motor; the second control circuit is connected between the battery pack and the second motor; the second control circuit includes M-phase second bridge arms, and the first end and the second end of the second bridge arm of each phase are respectively connected to the positive terminal and the negative terminal of the battery pack; the second motor includes M-phase first coils, and the common end of the upper half bridge and the lower half bridge of the second bridge arm of the i-th phase is connected to the first end of the second coil of the i-th phase; as well as A third control circuit includes an M-phase control unit; The common end of the first bridge arm of the i-th phase and the first coil of the i-th phase is connected to the first end of the control unit of the i-th phase, and the common end of the second bridge arm of the i-th phase and the second coil of the i-th phase is connected to the second end of the control unit of the i-th phase; The third control circuit is configured to connect the first coil of the i-th phase to the second bridge arm of the i-th phase through the i-th phase control unit.

19. The charging and discharging system according to claim 18, characterized in that: The charging and discharging system includes switching between a first stage and a second stage; In the first stage, the voltage output by the battery pack charges at least part of the first coil through the first control circuit; In the second stage, the charged first coil is discharged through the first control circuit; The third control circuit is configured to connect the first coil of the i-th phase and the second bridge arm of the i-th phase through the i-th control unit when there is a fault in the first bridge arm of the i-th phase and there is no fault in the second bridge arm of the i-th phase.

20. The drive system according to claim 18, characterized in that The first neutral point is also connected to the positive terminal of the charge and discharge port, and the negative terminal of the battery pack is connected to the negative terminal of the charge and discharge port; The charging and discharging system also includes switching between a third stage and a fourth stage; In the third stage, the voltage provided by the charging and discharging port charges at least part of the first coil through the first control circuit; In the fourth stage, the charged first coil is discharged through the first control circuit; The third control circuit is configured to connect the first coil of the i-th phase and the second bridge arm of the i-th phase through the i-th control unit when there is a fault in the first bridge arm of the i-th phase and there is no fault in the second bridge arm of the i-th phase.

21. The charging and discharging system according to claim 19 or 20, characterized in that: The third control circuit is configured to, when there is a fault in the half-bridge that needs to be turned on in the first bridge arm of the i-th phase and there is no fault in the corresponding half-bridge of the second bridge arm of the i-th phase, connect the faulty half-bridge of the first bridge arm of the i-th phase in parallel with the corresponding half-bridge of the second bridge arm of the i-th phase through the control unit of the i-th phase.

22. The charging and discharging system according to claim 19, characterized in that: In the first stage, the battery pack charges the first coil of the i-th phase through the first control circuit; The third control circuit is configured to, when there is a fault in the lower half bridge of the first bridge arm of the i-th phase and there is no fault in the lower half bridge of the second bridge arm of the i-th phase, The control unit of the i-th phase is turned on so that the current flows from the positive terminal of the battery pack through the i-th phase first coil, the i-th phase control unit, the lower half bridge of the i-th phase second bridge arm, to the negative terminal of the battery pack to form a loop.

23. The charging and discharging system according to claim 22, characterized in that: In the second stage, the charged first coil of the i-th phase discharges the battery pack; The third control circuit is configured to, when there is a fault in the upper half bridge of the first bridge arm of the i-th phase and there is no fault in the upper half bridge of the second bridge arm of the i-th phase, The control unit of the i-th phase is turned on so that the current flows from the first end of the first coil of the i-th phase after charging, through the i-th control unit, the upper half bridge of the second bridge arm of the i-th phase, the battery pack, to the second end of the first coil of the i-th phase, forming a loop.

24. The charging and discharging system according to claim 20, characterized in that: In the third stage, the voltage output by the charging and discharging port charges the first coil of the i-th phase through the first control circuit; The third control circuit is configured to, when there is a fault in the lower half bridge of the first bridge arm of the i-th phase and there is no fault in the lower half bridge of the second bridge arm of the i-th phase, The control unit of the i-th phase is turned on so that the current flows from the positive end of the charge and discharge port through the i-th phase first coil, the i-th phase control unit, the lower half bridge of the i-th phase second bridge arm, to the negative end of the charge and discharge port to form a loop.

25. The charging and discharging system according to claim 24, characterized in that: In the fourth stage, the charged first coil of the i-th phase discharges the battery pack; The third control circuit is configured to, when there is a fault in the upper half bridge of the first bridge arm of the i-th phase and there is no fault in the upper half bridge of the second bridge arm of the i-th phase, The control unit of the i-th phase is turned on so that the current flows from the first end of the first coil of the i-th phase after charging, through the i-th control unit, the upper half bridge of the second bridge arm of the i-th phase, the battery pack, to the second end of the first coil of the i-th phase, forming a loop.

26. The charge-discharge system according to any one of claims 18 to 20 and 22 to 25, characterized in that: The charging and discharging system further comprises: A first switch module, wherein a first end of the first switch module is connected to the first neutral point, and a second end of the first switch module is connected to the positive terminal of the battery pack and the first end of the first bridge arm of the M phase; The first switch module is configured to be closed when the voltage output by the battery pack charges the first coil.

27. The charging and discharging system according to any one of claims 18 to 20 and 22 to 25, characterized in that: The charging and discharging system further comprises: a second switch module, wherein a first end of the second switch module is connected to the first neutral point, and a second end of the second switch module is connected to the negative terminal of the battery pack and the second end of the first bridge arm of the M phase; The second switch module is configured to be closed when the charged first coil discharges the battery pack.

28. The charge-discharge system according to any one of claims 18 to 20 and 22 to 25, characterized in that: The control unit includes: at least one of a MOS tube, a parallel transistor and a diode or a control switch.

29. A vehicle, characterized in that: include: A drive system as claimed in any one of claims 1 to 17.

30. A vehicle, characterized in that: include: The charging and discharging system according to any one of claims 18 to 28.

31. The vehicle according to claim 30, characterized in that The vehicle further comprises: A charge and discharge port, wherein the positive terminal of the charge and discharge port is connected to the positive terminal of the battery pack, and the negative terminal of the charge and discharge port is connected to the negative terminal of the battery pack.

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