Vehicle, charge-discharge system, energy conversion device, and control method thereof

Abstract

The application provides a vehicle, a charging and discharging system, an energy conversion device and a control method thereof. The energy conversion device comprises a bus capacitor, a bridge arm converter, a first contactor, a motor and a charging and discharging module. The common end of the first contactor is connected with the bridge arm converter. The first switching end of the first contactor is connected with the motor. The second switching end of the first contactor is connected with the charging and discharging module. A plurality of charging and discharging coils are arranged in the charging and discharging module. When entering the charging and discharging mode, the common end of the first contactor is connected with the second switching end, so that the battery, the bus capacitor, the bridge arm converter, the first contactor and the charging and discharging module form a charging and discharging circuit. The wireless charging and wireless discharging functions of the vehicle are realized by controlling the working of the charging and discharging circuit, the emergency survival capability of the vehicle is improved, the power level of the wireless charging and discharging is improved by adopting the form of the multi-phase charging and discharging coil, and the charging and discharging time is saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric vehicles, in particular to a vehicle, a charging and discharging system, an energy conversion device and a control method thereof. BACKGROUND

[0002] With the strong support of national policy, new energy vehicles are constantly popularizing in China. The new energy vehicle industry in China has entered a new stage of large-scale development and a rapid growth period driven by policy and market. The endurance mileage and charging convenience of new energy vehicles are extremely important factors for people to consider purchasing or leasing new energy vehicles. On the one hand, due to the limitation of battery technology development, the endurance mileage of new energy vehicles is severely restricted; on the other hand, the supporting charging infrastructure construction is not perfect. Therefore, the V2V (Vehicle-to-Vehicle communication) technology in special circumstances emerges as the times require. The V2V technology is an intelligent network connection technology. Its principle is to use the transmission unit carried on each vehicle to send signals through a high-speed wireless network. These information includes the speed, direction, geographical position, route, etc. of the vehicle at that time, to realize the exchange between vehicles. However, the current V2V charging technology is limited by new energy vehicle equipment and needs to be connected through a wire harness. The charging process is complex, and when the wire harness does not match the charging port, it will cause the charging to fail. SUMMARY

[0003] The purpose of the present application is to provide a vehicle, a charging and discharging system, an energy conversion device and a control method thereof, to solve the problem that the vehicle-to-vehicle charging technology in the prior art causes the charging process to be complex through the connection of a wire harness and the charging to fail when the wire harness does not match the charging port.

[0004] The present application is implemented in this way. The first aspect of the present application provides an energy conversion device, comprising:

[0005] a bus capacitor, a first end of which is connected to a first output end of a battery, and a second end of which is connected to a second output end of the battery;

[0006] a bridge arm converter, comprising a plurality of phase bridge arms, a first end of each phase bridge arm being commonly connected as a first bus bar, and a second end of each phase bridge arm being commonly connected as a second bus bar, the first bus bar being connected to the first end of the bus capacitor, and the second bus bar being connected to the second end of the bus capacitor;

[0007] a first contactor, comprising a plurality of common ends, each common end being connected to a middle end of a phase bridge arm, and each common end corresponding to a first switching end and a second switching end;

[0008] a motor, comprising a plurality of motor coils, one end of each motor coil being connected to a first switching end, and the other end of each motor coil being commonly connected;

[0009] The charging and discharging module comprises a plurality of charging and discharging coils, one end of each charging and discharging coil is connected to one second switching end, and the other end of each charging and discharging coil is commonly connected.

[0010] The second aspect of the present application provides a control method of an energy conversion device, based on the energy conversion device of the first aspect, the control method comprises:

[0011] obtaining the working mode of the energy conversion device;

[0012] when the energy conversion device is in the driving mode, controlling the common end of the first contactor to be connected to the first switching end, so that the battery drives the motor to work through the bridge arm converter and the first contactor;

[0013] when the energy conversion device is in the wireless charging mode, controlling the common end of the first contactor to be connected to the second switching end, so that the charging and discharging module performs wireless discharging on the vehicle to be charged;

[0014] when the energy conversion device is in the wireless charging mode, controlling the common end of the first contactor to be connected to the second switching end, so that the battery receives wireless discharging of the vehicle to be discharged through the energy conversion device.

[0015] The third aspect of the present application provides a vehicle, the vehicle further comprises the energy conversion device of the first aspect, the battery module and the battery, and the battery is connected in parallel with the bus capacitor.

[0016] The fourth aspect of the present application provides a charging and discharging system, comprising: a first energy conversion device and a second energy conversion device, the first energy conversion device comprises:

[0017] a first bus capacitor, a first end of the first bus capacitor is connected to a first output end of a first battery, and a second end of the first bus capacitor is connected to a second output end of the first battery;

[0018] a first bridge arm converter, comprising a plurality of phase bridge arms, a first end of each phase bridge arm is commonly connected as a first bus end, and a second end of each phase bridge arm is commonly connected as a second bus end, the first bus end is connected to the first end of the first bus capacitor, and the second bus end is connected to the second end of the first bus capacitor;

[0019] a first contactor, comprising a plurality of common ends, each common end is connected to a middle end of a phase bridge arm, and each common end corresponds to a first switching end and a second switching end;

[0020] a first motor, comprising a plurality of motor coils, one end of each motor coil is connected to one first switching end, and the other end of each motor coil is commonly connected;

[0021] The first charge-discharge module includes a plurality of charge-discharge coils, one end of each charge-discharge coil is connected to one second switch end, and the other end of each charge-discharge coil is commonly connected;

[0022] The second energy conversion device includes:

[0023] The second bus capacitor has a first end connected to the first output end of the second battery and a second end connected to the second output end of the second battery;

[0024] The second bridge arm converter includes a plurality of phase bridge arms, a first end of each phase bridge arm is commonly connected as a first bus bar, and a second end of each phase bridge arm is commonly connected as a second bus bar, the first bus bar is connected to the first end of the second bus capacitor, and the second bus bar is connected to the second end of the second bus capacitor;

[0025] The second contactor includes a plurality of common ends, each common end is connected to the middle end of a phase bridge arm, and each common end corresponds to a third switch end and a fourth switch end;

[0026] The second motor includes a plurality of motor coils, one end of each motor coil is connected to one third switch end, and the other end of each motor coil is commonly connected;

[0027] The second charge-discharge module includes a plurality of charge-discharge coils, one end of each charge-discharge coil is connected to one fourth switch end, and the other end of each charge-discharge coil is commonly connected;

[0028] When the first energy conversion device is in a wireless discharge mode and the second energy conversion device is in a wireless charging mode, the common end of the first contactor is connected to the second switch end, the common end of the second contactor is connected to the fourth switch end, the first charge-discharge module performs wireless discharge on the second energy conversion device, and the second battery receives wireless discharge of the first energy conversion device through the second energy conversion device.

[0029] The fifth aspect of the present application provides a control method of the charge-discharge system provided in the fourth aspect, and the control method of the first energy conversion device includes:

[0030] Receiving a wireless connection request, and obtaining a charge-discharge mode when the wireless connection is successful;

[0031] When the charge-discharge mode is a discharge mode, receiving a wireless charging parameter;

[0032] Controlling the common end of the first contactor to be connected to the second switch end, controlling the first bridge arm converter to work according to the wireless charging parameter, and making the first charge-discharge module perform wireless discharge on the second energy conversion device.

[0033] The sixth aspect of the application provides a control method of the charging and discharging system provided by the fourth aspect, and the control method of the second energy conversion device comprises the following steps of:

[0034] sending a wireless connection request, and obtaining a charging and discharging mode when the wireless connection is successful;

[0035] when the charging and discharging mode is a charging mode, sending a wireless charging parameter;

[0036] controlling the common end of the second contactor to be connected to a fourth switching end, controlling the second bridge arm converter to work according to the wireless charging parameter, and collecting wireless discharging of the first charging and discharging module through the second charging and discharging module.

[0037] The application provides a vehicle, a charging and discharging system, an energy conversion device and a control method thereof. The energy conversion device comprises a bus capacitor, a bridge arm converter, a first contactor, a motor and a charging and discharging module. The common end of the first contactor is connected to the bridge arm converter. The first switching end of the first contactor is connected to the motor. The second switching end of the first contactor is connected to the charging and discharging module. A plurality of charging and discharging coils are arranged in the charging and discharging module. When the charging and discharging mode is entered, the common end of the first contactor is connected to the second switching end, so that the battery, the bus capacitor, the bridge arm converter, the first contactor and the charging and discharging module form a charging and discharging circuit. The wireless charging and wireless discharging functions of the vehicle are realized by controlling the charging and discharging circuit to work. The functions of mutual charging and discharging between vehicles are realized. The emergency survival capability of the vehicle is improved. The power level of wireless charging and discharging is improved by adopting the form of multiple-phase charging and discharging coils. The charging and discharging time is saved. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without any creative labor.

[0039] Figure 1 is a structural schematic diagram of an energy conversion device provided by the first embodiment of the application;

[0040] Figure 2 is another structural schematic diagram of an energy conversion device provided by the first embodiment of the application;

[0041] Figure 3 is another structural schematic diagram of an energy conversion device provided by the first embodiment of the application;

[0042] Figure 4 is a circuit diagram of an energy conversion device provided by the first embodiment of the application;

[0043] Figure 5 is a flow chart of a control method of a charging and discharging system provided by Embodiment Four of the present application;

[0044] Figure 6 is a flow chart of a control method of a charging and discharging system provided by Embodiment Five of the present application;

[0045] Figure 7 is a working circuit diagram of a charging and discharging system provided by Embodiment Three of the present application;

[0046] Figure 8 is a flow chart of a control method of a charging and discharging system provided by Embodiment Three of the present application. DETAILED DESCRIPTION

[0047] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application.

[0048] In order to illustrate the technical solutions of the present application, the following will be described through specific embodiments.

[0049] Embodiment One of the present application provides an energy conversion device, as shown in the figure, comprising: Figure 1

[0050] a bus capacitor 101, a first end of which is connected to a first output end of a battery 10, and a second end of which is connected to a second output end of the battery 10;

[0051] a bridge arm converter 102, comprising a plurality of phase bridge arms, a first end of each phase bridge arm being connected as a first bus end, and a second end of each phase bridge arm being connected as a second bus end, the first bus end being connected to the first end of the bus capacitor 101, and the second bus end being connected to the second end of the bus capacitor 101;

[0052] a first contactor 103, comprising a plurality of common ends, each common end being connected to a middle end of a phase bridge arm, and each common end corresponding to a first switching end and a second switching end;

[0053] a motor 104, comprising a plurality of motor coils, one end of each motor coil being connected to a first switching end, and the other end of each motor coil being connected in common;

[0054] a charging and discharging module 105, comprising a plurality of charging and discharging coils, the charging and discharging coils being wireless charging and discharging coils, one end of each charging and discharging coil being connected to a second switching end, and the other end of each charging and discharging coil being connected in common.

[0055] ​The bus capacitor 101 is connected in parallel with the battery 10, and is used to stabilize the voltage output by the battery 10. The bridge arm converter 102 includes multiple phases of bridge arms, each phase of bridge arm including two power switches, which can be transistors, IGBTs, MOS tubes, or other types of devices, and the two power switches can be bidirectionally turned on, and an intermediate terminal is formed between the two power switches. The first contactor 103 includes multiple common terminals and switching terminals corresponding to each common terminal. Each common terminal corresponds to at least two switching terminals, i.e., a first switching terminal and a second switching terminal. A switching switch is arranged on each common terminal. The switching switch on each common terminal can be switched to the first switching terminal simultaneously according to a first control instruction, so that each common terminal is connected to the first switching terminal. The switching switch on each common terminal can also be switched to the second switching terminal simultaneously according to a second control instruction, so that each common terminal is connected to the second switching terminal. The motor includes multiple motor coils, for example, three motor coils. One end of each motor coil is connected to a first switching terminal, and the other end of each motor coil is commonly connected. When the switching switch on each common terminal is switched to the first switching terminal simultaneously, the motor coil is connected to the bridge arm converter 102 through the first contactor 103, and the battery 10 can drive the motor through the bridge arm converter 102 by controlling the power switch on the bridge arm converter 102. The charge and discharge module 105 includes multiple charge and discharge coils. When the switching switch on each common terminal is switched to the second switching terminal simultaneously, the charge and discharge coil is connected to the bridge arm converter 102 through the first contactor 103. The direct current in the battery 10 is converted into three-phase alternating current of the primary side of the charge and discharge coil through the power switch on the bridge arm converter 102, and the vehicle to be charged is wirelessly charged through the change of current on the charge and discharge coil.

[0056] The technical scheme of the present application provides an energy conversion device, which includes a bus capacitor, a bridge arm converter, a first contactor, a motor, and a charge and discharge module. The common terminal of the first contactor is connected to the bridge arm converter. The first switching terminal of the first contactor is connected to the motor. The second switching terminal of the first contactor is connected to the charge and discharge module. Multiple charge and discharge coils are arranged in the charge and discharge module. When the charge and discharge mode is entered, the common terminal of the first contactor is connected to the second switching terminal, so that the battery, the bus capacitor, the bridge arm converter, the first contactor, and the charge and discharge module form a charge and discharge circuit. The wireless charging and wireless discharging functions of the vehicle are realized by controlling the operation of the charge and discharge circuit, thereby improving the emergency survival capability of the vehicle. In addition, the use of multiple-phase charge and discharge coils can improve the power level of wireless charging and discharging, and save the charging and discharging time.

[0057] As an implementation manner, as shown in Figure 2 The energy conversion device 20 further includes a control module 30 connected to the control terminal of the bridge arm converter 102 and the control terminal of the first contactor 103. The control module 30 is used to:

[0058] When the energy conversion device 20 is in the driving mode, the common terminal of the first contactor 103 is connected to the first switching terminal, so that the battery 10 drives the motor through the bridge arm converter 102 and the first contactor 103;

[0059] When the energy conversion device 20 is in the wireless discharging mode, the common terminal of the first contactor 103 is connected to the second switching terminal, so that the charge-discharge module 105 performs wireless discharging on the energy conversion device to be charged;

[0060] When the energy conversion device 20 is in the wireless charging mode, the common terminal of the first contactor 103 is connected to the second switching terminal, so that the battery 10 receives the wireless discharging of the energy conversion device to be charged through the energy conversion device 20.

[0061] When the control module 30 receives the driving instruction, the common terminal of the first contactor 103 is connected to the first switching terminal, and the power switch in the bridge arm converter 102 is controlled to realize the control of the motor output power.

[0062] When the control module 30 receives the wireless discharging instruction, the common terminal of the first contactor 103 is connected to the second switching terminal, and the power switch in the bridge arm converter 102 is controlled to adjust the current in the charge-discharge coil in the charge-discharge module 105, so that the charge-discharge module 105 performs wireless charging on the vehicle to be charged.

[0063] When the control module 30 receives the wireless charging instruction, the common terminal of the first contactor 103 is connected to the second switching terminal, and the power switch in the bridge arm converter 102 is controlled to convert the three-phase power in the charge-discharge coil into direct current and output to the battery 10, so that the vehicle to be discharged performs wireless charging on the vehicle to be charged.

[0064] When the energy conversion device is in the driving mode, the battery 10, the bus capacitor 101, the bridge arm converter 102, the first contactor 103 and the motor 104 form a motor driving circuit;

[0065] When the energy conversion device is in the charge-discharge mode, the battery 10, the bus capacitor 101, the bridge arm converter 102, the first contactor 103 and the charge-discharge module 105 form a charge-discharge circuit;

[0066] The bus capacitor 101, the bridge arm converter 102 and the first contactor 103 are used in the motor driving circuit and the charge-discharge circuit.

[0067] In the embodiment, the bus capacitor, the bridge arm converter and the first contactor are reused in the motor driving circuit and the charging and discharging circuit, the utilization rate of the bus capacitor, the bridge arm converter and the first contactor is improved, and the circuit cost is saved.

[0068] When the energy conversion device is in the wireless discharging mode or the wireless charging mode, the control module controls the first contactor to make the bridge arm converter conduct with the charging and discharging coil, and adjusts the bridge arm converter to realize voltage adjustment.

[0069] In the embodiment, the control module can control the bridge arm converter and the contactor at the same time, and the product cost is not excessively high due to the additional control chip.

[0070] The number of the charging and discharging coils is three, that is, three-phase charging and discharging coils are formed. Compared with the prior art adopting two charging and discharging coils, the power of energy conversion is higher.

[0071] Further, as shown in Figure 3 and Figure 4 The bridge arm converter 102 includes a first-phase bridge arm, a second-phase bridge arm and a third-phase bridge arm. The first end of the first-phase bridge arm, the first end of the second-phase bridge arm and the first end of the third-phase bridge arm are connected to a first bus bar. The second end of the first-phase bridge arm, the second end of the second-phase bridge arm and the second end of the third-phase bridge arm are connected to a second bus bar.

[0072] The first contactor 103 includes a first common terminal, a second common terminal and a third common terminal. The first common terminal is connected to the middle end of the first-phase bridge arm. The second common terminal is connected to the middle end of the second-phase bridge arm. The third common terminal is connected to the middle end of the third-phase bridge arm.

[0073] As an embodiment, the first-phase bridge arm 121 includes a first power switch T1 and a second power switch T2 connected in series. The first end of the first power switch T1 is the first end of the first-phase bridge arm 121. The second end of the second power switch T2 is the second end of the first-phase bridge arm 121. The second end of the first power switch T1 and the first end of the second power switch T2 are connected to the middle end of the first-phase bridge arm 121.

[0074] The second-phase bridge arm 122 includes a third power switch T3 and a fourth power switch T4 connected in series. The first end of the third power switch T3 is the first end of the second-phase bridge arm 122. The second end of the fourth power switch T4 is the second end of the second-phase bridge arm 122. The second end of the third power switch T3 and the first end of the fourth power switch T4 are connected to the middle end of the second-phase bridge arm 122.

[0075] The third phase bridge arm 123 includes a fifth power switch T5 and a sixth power switch T6 connected in series, the first end of the fifth power switch T5 is the first end of the third phase bridge arm 123, the second end of the sixth power switch T6 is the second end of the third phase bridge arm 123, and the second end of the fifth power switch T5 and the first end of the sixth power switch T6 are commonly connected as the middle end of the third phase bridge arm 123.

[0076] The control ends of the first power switch T1, the second power switch T2, the third power switch T3, the fourth power switch T4, the fifth power switch T5, and the sixth power switch T6 are connected to the control module 30, and are in an on or off state according to a control instruction of the control module 30.

[0077] The first phase bridge arm 121, the second phase bridge arm 122, and the third phase bridge arm 123 are provided, so that the use of the three-phase full-bridge inverter power tube of the vehicle is balanced, and the use of the three-phase full-bridge inverter power tube is not unbalanced relative to the single-phase topology, thereby affecting the actual performance of the vehicle.

[0078] The motor 104 includes a first motor coil, a second motor coil, and a third motor coil, the first end of the first motor coil is connected to the first switching end corresponding to the first common end, the first end of the second motor coil is connected to the first switching end of the second common end, and the first end of the third coil is connected to the first switching end of the third common end. The second end of the first motor coil, the second end of the second motor coil, and the second end of the third coil are commonly connected.

[0079] As an embodiment, the charging and discharging module 105 includes a first charging and discharging coil, a second charging and discharging coil, and a third charging and discharging coil, the first end of the first charging and discharging coil is connected to the second switching end corresponding to the first common end, the first end of the second charging and discharging coil is connected to the second switching end corresponding to the second common end, and the first end of the third charging and discharging coil is connected to the second switching end corresponding to the third common end.

[0080] When the vehicle to be charged is wirelessly charged, the direct current in the high-voltage battery of the vehicle to be charged is converted into three-phase alternating current on the primary side of the charging and discharging coil, the vehicle to be charged can induct three-phase alternating current of the same frequency on the secondary side of the charging and discharging coil, and the inducted three-phase alternating current is converted into direct current according to a preset configuration and flows into the high-voltage battery of the vehicle to be charged.

[0081] In the embodiment, the introduction of the three-phase charging and discharging coil can significantly improve the power level of wireless charging and discharging, reduce the time of vehicle-to-vehicle wireless charging and discharging, and improve the system efficiency.

[0082] Further, the energy conversion device 20 further comprises a DC / DC converter 106, a first end of the DC / DC converter 106 is connected to the first output end of the battery 10, a second end of the DC / DC converter 106 is connected to the second output end of the battery 10, a third end of the DC / DC converter 106 is connected to the first end of the bus capacitor 101, and a fourth end of the DC / DC converter 106 is connected to the second end of the bus capacitor 101.

[0083] Wherein, by setting the DC / DC converter 106, the voltage output by the battery 10 can be converted to direct current when the battery 10 is discharging, and the voltage output by the bridge arm converter 102 can be converted to direct current when the battery 10 is charging.

[0084] The technical solutions of the embodiments of the present application will be described in detail below through specific circuit structures:

[0085] Figure 4 A circuit diagram of an example of vehicle-to-vehicle charging provided by the embodiments of the present application, the energy conversion device 20 comprises a DC / DC converter 106, a bus capacitor C, a bridge arm converter 102, a first contactor 103, a motor, and a charge and discharge module 105, the bridge arm converter 102 comprises a first power switch T1, a second power switch T2, a third power switch T3, a fourth power switch T4, a fifth power switch T5, and a sixth power switch T6, the positive and negative electrodes of the battery 10 are connected to the first end and the second end of the DC / DC converter 106 respectively, the third end and the fourth end of the DC / DC converter 106 are connected to the first end and the second end of the bus capacitor C respectively, the first end of the bus capacitor C is connected to the first end of the first power switch T1, the first end of the third power switch T3, and the first end of the fifth power switch T5, the second end of the bus capacitor C is connected to the second end of the second power switch T2, the second end of the fourth power switch T4, and the second end of the sixth power switch T6, the first contactor 103 comprises a common end A, a first switching end 1, a second switching end 2, a common end B, a first switching end 3, a second switching end 4, a common end C, a first switching end 5, and a second switching end 6, the common end A is connected to the second end of the first power switch T1 and the first end of the second power switch T2, the common end B is connected to the second end of the third power switch T3 and the first end of the fourth power switch T4, and the common end C is connected to the second end of the fifth power switch T5 and the first end of the sixth power switch T6, the first motor coil of the motor 104 is connected to the first switching end 1, the second motor coil of the motor 104 is connected to the first switching end 3, the third motor coil of the motor 104 is connected to the first switching end 5, the first charge and discharge coil of the charge and discharge module 105 is connected to the second switching end 2, the second charge and discharge coil of the charge and discharge module 105 is connected to the second switching end 4, and the third charge and discharge coil of the charge and discharge module 105 is connected to the second switching end 6.

[0086] The embodiment two of the application provides a control method of an energy conversion device, based on the energy conversion device of the embodiment one, the control method comprises the following steps:

[0087] acquiring a working mode of the energy conversion device;

[0088] when the energy conversion device is in the driving mode, the common end of the first contactor is connected to the first switching end, so that the battery drives the motor to work through the bridge arm converter and the first contactor;

[0089] when the energy conversion device is in the wireless charging mode, the common end of the first contactor is connected to the second switching end, so that the charge-discharge module performs wireless discharging on the energy conversion device to be charged;

[0090] when the energy conversion device is in the wireless charging mode, the common end of the first contactor is connected to the second switching end, so that the battery receives the wireless discharging of the energy conversion device to be charged through the energy conversion device.

[0091] When the control module receives the driving instruction, the common end of the first contactor is connected to the first switching end, and the output power of the motor is controlled by controlling the power switch in the bridge arm converter.

[0092] When the control module receives the wireless discharging instruction, the energy conversion device is in the vehicle to be discharged and the vehicle to be charged is connected through wireless communication, the common end of the first contactor is connected to the second switching end, and the current on the charge-discharge coil in the charge-discharge module is adjusted by controlling the power switch in the bridge arm converter, so that the charge-discharge module performs wireless charging on the vehicle to be charged.

[0093] When the control module receives the wireless charging instruction, the energy conversion device is in the vehicle to be charged and the vehicle to be discharged is connected through wireless communication, the common end of the first contactor is connected to the second switching end, and the three-phase power on the charge-discharge coil is converted into direct current by controlling the power switch in the bridge arm converter, so that the vehicle to be discharged performs wireless charging on the vehicle to be charged.

[0094] When the energy conversion device is in the wireless discharging mode or the wireless charging mode, the bridge arm converter and the charge-discharge coil are turned on by controlling the first contactor through the control module, and the voltage adjustment is realized by adjusting the bridge arm converter.

[0095] The embodiment three of the application provides a charge-discharge system, comprising: a first energy conversion device and a second energy conversion device, the first energy conversion device comprising:

[0096] a first bus capacitor, a first end of the first bus capacitor being connected to a first output end of a first battery, and a second end of the first bus capacitor being connected to a second output end of the first battery;

[0097] The first bridge arm converter comprises a plurality of phase bridge arms, the first ends of each phase bridge arm are connected as a first bus bar, the second ends of each phase bridge arm are connected as a second bus bar, the first bus bar is connected to the first end of the first bus capacitor, and the second bus bar is connected to the second end of the first bus capacitor.

[0098] The first contactor comprises a plurality of common terminals, each common terminal is connected to the middle end of a phase bridge arm, and each common terminal corresponds to a first switching terminal and a second switching terminal.

[0099] The first motor comprises a plurality of motor coils, one end of each motor coil is connected to a first switching terminal, and the other end of each motor coil is connected.

[0100] The first charge and discharge module comprises a plurality of charge and discharge coils, one end of each charge and discharge coil is connected to a second switching terminal, and the other end of each charge and discharge coil is connected.

[0101] The second energy conversion device comprises:

[0102] The second bus capacitor is connected to the first output end of the second battery at the first end and to the second output end of the second battery at the second end.

[0103] The second bridge arm converter comprises a plurality of phase bridge arms, the first ends of each phase bridge arm are connected as a first bus bar, the second ends of each phase bridge arm are connected as a second bus bar, the first bus bar is connected to the first end of the second bus capacitor, and the second bus bar is connected to the second end of the second bus capacitor.

[0104] The second contactor comprises a plurality of common terminals, each common terminal is connected to the middle end of a phase bridge arm, and each common terminal corresponds to a third switching terminal and a fourth switching terminal.

[0105] The second motor comprises a plurality of motor coils, one end of each motor coil is connected to a third switching terminal, and the other end of each motor coil is connected.

[0106] The second charge and discharge module comprises a plurality of charge and discharge coils, one end of each charge and discharge coil is connected to a fourth switching terminal, and the other end of each charge and discharge coil is connected.

[0107] When the first energy conversion device is in the wireless discharge mode and the second energy conversion device is in the wireless charging mode, the common terminals of the first contactor are connected to the second switching terminals, the common terminals of the second contactor are connected to the fourth switching terminals, the first charge and discharge module performs wireless discharge on the second energy conversion device, and the second battery receives wireless discharge of the first energy conversion device through the second energy conversion device.

[0108] The first energy conversion device further comprises a first control module connected to the control end of the first bridge arm converter and the control end of the first contactor, and the first control module is configured to:

[0109] When the first energy conversion device is in the wireless discharge mode, the common end of the first contactor is controlled to be connected to the second switching end, so that the first charge-discharge module performs wireless discharge on the second energy conversion device.

[0110] The second energy conversion device further comprises a second control module connected to the control end of the second bridge arm converter and the control end of the second contactor, and the second control module is configured to:

[0111] When the second energy conversion device is in the wireless charging mode, the common end of the second contactor is controlled to be connected to the fourth switching end, so that the second battery receives wireless discharge from the first energy conversion device.

[0112] When the first control module receives a wireless discharge instruction, the first control module and the second control module have completed wireless communication connection, the first control module adjusts the current on the charge-discharge coil in the first charge-discharge module by controlling the power switch in the first bridge arm converter, and the first charge-discharge module performs wireless discharge.

[0113] When the second control module receives a wireless charging instruction, the second control module and the first control module have completed wireless communication connection, the common end of the second contactor is connected to the fourth switching end, and the three-phase power on the charge-discharge coil is converted to direct current by controlling the power switch in the second bridge arm converter and output to the second battery, so as to realize wireless charging of the second battery.

[0114] Embodiment four of the present application provides a control method based on the charge-discharge system provided in embodiment three, as shown in Figure 5 The control method of the first energy conversion device comprises:

[0115] Step S101. Receive a wireless connection request, and obtain a charge-discharge mode when the wireless connection is successful.

[0116] Step S102. When the charge-discharge mode is a discharge mode, receive a wireless charging parameter.

[0117] The wireless charging parameter includes the charging power, the power information of the battery to be charged, the time sequence, the switching frequency and the duty cycle of the power switch tube of the first bridge arm converter.

[0118] Step S103. Control the common end of the first contactor to be connected to the second switching end, control the first bridge arm converter to work according to the wireless charging parameter, and make the first charge-discharge module perform wireless discharge on the second energy conversion device.

[0119] The first bridge arm converter is controlled according to the wireless charging parameter, and then the current of the wireless charging and discharging coil is adjusted, so that wireless discharging is realized.

[0120] Embodiment five provides a control method based on the charging and discharging system provided in embodiment three. Figure 6 As shown in the figure, the control method of the second energy conversion device comprises:

[0121] Step S201. A wireless connection request is sent, and when the wireless connection is successful, the charging and discharging mode is obtained.

[0122] Step S202. When the charging and discharging mode is the charging mode, the wireless charging parameter is sent.

[0123] The wireless charging parameter comprises the charging power, the power information of the battery to be charged, the time sequence, the switching frequency and the duty cycle of the power switch tube of the first bridge arm converter.

[0124] Step S203. The common end of the second contactor is connected to the fourth switching end, the second bridge arm converter is controlled according to the wireless charging parameter, and the wireless discharging of the first charging and discharging module is collected through the second charging and discharging module.

[0125] The secondary side coil of the second charging and discharging coil induces a three-phase alternating current of the same frequency, and with the action of the power switch of the first bridge arm converter, the induced three-phase alternating current is converted into direct current and flows into the second battery according to the preset configuration.

[0126] The above embodiments are specifically described below through specific circuit structures:

[0127] Figure 7An example circuit diagram of vehicle-to-vehicle charging provided by the embodiments of the present application, the energy conversion device in the A vehicle includes a DC / DC converter 106, a bus capacitor C1, a bridge arm converter 102, a first contactor 103, a motor 104, and a charge-discharge module 105, the bridge arm converter 102 includes a first power switch T1, a second power switch T2, a third power switch T3, a fourth power switch T4, a fifth power switch T5, and a sixth power switch T6, the positive and negative poles of the battery 10 are connected to the first and second ends of the DC / DC converter 106 respectively, the third and fourth ends of the DC / DC converter 106 are connected to the first and second ends of the bus capacitor C1 respectively, the first end of the bus capacitor C1 is connected to the first ends of the first power switch T1, the third power switch T3, and the fifth power switch T5, the second end of the bus capacitor C1 is connected to the second ends of the second power switch T2, the fourth power switch T4, and the sixth power switch T6, the first contactor 103 includes a common end A, a first switching end 1, a second switching end 2, a common end B, a first switching end 3, a second switching end 4, a common end C, a first switching end 5, and a second switching end 6, the common end A is connected to the second end of the first power switch T1 and the first end of the second power switch T2, the common end B is connected to the second end of the third power switch T3 and the first end of the fourth power switch T4, the common end C is connected to the second end of the fifth power switch T5 and the first end of the sixth power switch T6, the first motor coil of the motor 104 is connected to the first switching end 1, the second motor coil of the motor 104 is connected to the first switching end 3, the third motor coil of the motor 104 is connected to the first switching end 5, the first charge-discharge coil of the charge-discharge module 105 is connected to the second switching end 2, the second charge-discharge coil of the charge-discharge module 105 is connected to the second switching end 4, and the third charge-discharge coil of the charge-discharge module 105 is connected to the second switching end 6.

[0128] The energy conversion device in the B car includes a DC / DC converter 206, a bus capacitor C2, a bridge arm converter 202, a second contactor 203, a motor 204, and a charge-discharge module 205. The bridge arm converter 202 includes a seventh power switch T7, an eighth power switch T8, a ninth power switch T9, a tenth power switch T10, an eleventh power switch T11, and a twelfth power switch T12. The positive and negative poles of the battery 60 are connected to the first and second ends of the DC / DC converter, respectively. The third and fourth ends of the DC / DC converter are connected to the first and second ends of the bus capacitor C2, respectively. The first end of the bus capacitor C2 is connected to the first ends of the seventh power switch T7, the ninth power switch T9, and the eleventh power switch T11. The second end of the bus capacitor C2 is connected to the second ends of the eighth power switch T8, the tenth power switch T10, and the twelfth power switch T12. The second contactor 203 includes a common end D, a first switching end 11, a second switching end 12, a common end E, a first switching end 13, a second switching end 14, a common end F, a first switching end 15, and a second switching end 16. The common end D is connected to the second end of the seventh power switch T7 and the first end of the eighth power switch T8. The common end E is connected to the second end of the ninth power switch T9 and the first end of the tenth power switch T10. The common end F is connected to the second end of the eleventh power switch T11 and the first end of the twelfth power switch T12. The first motor coil of the motor 204 is connected to the first switching end 11. The second motor coil of the motor 204 is connected to the first switching end 13. The third motor coil of the motor 204 is connected to the first switching end 15. The first charge-discharge coil of the charge-discharge module 205 is connected to the second switching end 12. The second charge-discharge coil of the charge-discharge module 205 is connected to the second switching end 14. The third charge-discharge coil of the charge-discharge module 205 is connected to the second switching end 16.

[0129] As Figure 8 shown in a new type of electric vehicle V2V wireless charging and discharging system and control method flow chart, the control method is as follows:

[0130] Step 1: The charging / donating flow starts by establishing a connection between the two vehicles through the vehicle-mounted Bluetooth, WiFi or other wireless connection methods. The trigger of step 1 can be through but not limited to the user pressing the physical button or the virtual button on the vehicle-mounted touch screen.

[0131] Step 2: After successful wireless connection, the user needs to set the charging / donating mode on both electric vehicles.

[0132] Step 3: The vehicle to be charged sends the required charging power, voltage, current and power information through the wireless connection established in step 1.

[0133] Step 4: The vehicle to be charged confirms the power and electricity demand of the vehicle to be charged through the wireless connection established in step 1.

[0134] Step 5: The vehicle to be charged and the vehicle to be charged respectively act on the contactors.

[0135] Step 6: The controller of the vehicle to be charged configures the charging power, electricity information determined in step 4, power tube switching time sequence of the vehicle to be charged including but not limited to frequency and duty cycle information, etc., and sends the configuration information to the vehicle to be charged through the wireless connection established in step 1.

[0136] Step 7: After the configuration is confirmed by both vehicles, the charging starts. At this time, the power tubes of both electric vehicles start synchronous switching action through the configuration confirmed by the configuration information. With the action of the power switch of the vehicle to be charged, the direct current in the high-voltage battery of the vehicle to be charged will be converted into three-phase alternating current in the primary side of the charging coil. The vehicle to be charged can induce three-phase alternating current of the same frequency in the secondary side of the charging coil. With the action of the power switch of the vehicle to be charged, the induced three-phase alternating current is converted into direct current, which flows into the high-voltage battery of the vehicle to be charged according to the preset configuration.

[0137] The above step 7 is repeated until either the vehicle to be charged or the vehicle to be charged initiates the process or when the preset charging electricity is completed, the charging process is terminated.

[0138] Step 8: After the charging process is terminated or ended, both vehicles restore their original configuration.

[0139] Another embodiment of the present application provides a vehicle, which further comprises the energy conversion device provided in the first embodiment and a battery connected in parallel with the bus capacitor.

[0140] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. An energy conversion device, characterized by, The energy conversion device comprises: a bus capacitor, a first end of which is connected to a first output end of a battery, and a second end of which is connected to a second output end of the battery; a bridge arm converter, which comprises a plurality of phase bridge arms, a first end of each phase bridge arm is connected to a first bus bar, and a second end of each phase bridge arm is connected to a second bus bar, the first bus bar is connected to the first end of the bus capacitor, and the second bus bar is connected to the second end of the bus capacitor; a first contactor, which comprises a plurality of common terminals, each common terminal is connected to a middle terminal of a phase bridge arm, and each common terminal is connected to a first switching terminal and a second switching terminal; a motor, which comprises a plurality of motor coils, one end of each motor coil is connected to a first switching terminal, and the other end of each motor coil is connected to a common terminal; a charging and discharging module, which comprises a plurality of charging and discharging coils, one end of each charging and discharging coil is connected to a second switching terminal, and the other end of each charging and discharging coil is connected to a common terminal, and the charging and discharging coils are wireless charging and discharging coils; when the energy conversion device is in a wireless discharging mode, the common terminals of the first contactor are connected to the second switching terminals, so that the charging and discharging module performs wireless discharging on the energy conversion device to be charged; when the energy conversion device is in a wireless charging mode, the common terminals of the first contactor are connected to the second switching terminals, so that the battery receives wireless discharging of the energy conversion device to be discharged through the energy conversion device; the energy conversion device further comprises a control module, the control module is connected to a control terminal of the bridge arm converter and a control terminal of the first contactor, and the control module is used to: when the energy conversion device is in a driving mode, the common terminals of the first contactor are connected to the first switching terminals, so that the battery drives the motor to work through the bridge arm converter and the first contactor; when the energy conversion device is in the wireless discharging mode or the wireless charging mode, the control module controls the first contactor to make the bridge arm converter conduct with the charging and discharging coils, and adjusts the bridge arm converter to achieve voltage adjustment; the control module is further used to: receive a wireless connection request, and obtain a charging and discharging mode when the wireless connection is successful; when the charging and discharging mode is a discharging mode, receive wireless charging parameters, the wireless charging parameters comprising charging power, power information of a battery to be charged, time sequence, switching frequency and duty cycle of a power switch tube of the bridge arm converter; control the common terminals of the first contactor to be connected to the second switching terminals, control the bridge arm converter to work according to the wireless charging parameters, and make the charging and discharging module perform wireless discharging on other energy conversion devices.

2. The energy conversion device of claim 1, wherein, The number of the charging and discharging coils is three.

3. The energy conversion device of claim 1, wherein, the bridge arm converter comprises a first phase bridge arm, a second phase bridge arm and a third phase bridge arm, a first end of the first phase bridge arm, a first end of the second phase bridge arm and a first end of the third phase bridge arm are connected to the first bus bar, and a second end of the first phase bridge arm, a second end of the second phase bridge arm and a second end of the third phase bridge arm are connected to the second bus bar. The first contactor includes a first common terminal, a second common terminal and a third common terminal, the first common terminal is connected to the middle terminal of the first phase bridge arm, the second common terminal is connected to the middle terminal of the second phase bridge arm, and the third common terminal is connected to the middle terminal of the third phase bridge arm.

4. The energy conversion device of claim 3, wherein, The first phase bridge arm includes a first power switch and a second power switch connected in series, the first end of the first power switch is the first end of the first phase bridge arm, the second end of the second power switch is the second end of the first phase bridge arm, and the second end of the first power switch and the first end of the second power switch are connected as the middle terminal of the first phase bridge arm. The second phase bridge arm includes a third power switch and a fourth power switch connected in series, the first end of the third power switch is the first end of the second phase bridge arm, the second end of the fourth power switch is the second end of the second phase bridge arm, and the second end of the third power switch and the first end of the fourth power switch are connected as the middle terminal of the second phase bridge arm. The third phase bridge arm includes a fifth power switch and a sixth power switch connected in series, the first end of the fifth power switch is the first end of the third phase bridge arm, the second end of the sixth power switch is the second end of the third phase bridge arm, and the second end of the fifth power switch and the first end of the sixth power switch are connected as the middle terminal of the third phase bridge arm.

5. The energy conversion device of claim 3, wherein, The motor includes a first motor coil, a second motor coil and a third motor coil, the first end of the first motor coil is connected to the first switching terminal corresponding to the first common terminal, the first end of the second motor coil is connected to the first switching terminal of the second common terminal, and the first end of the third coil is connected to the first switching terminal of the third common terminal.

6. The energy conversion device of claim 3, wherein, The first end of the first charging and discharging coil is connected to the second switching terminal corresponding to the first common terminal, the first end of the second charging and discharging coil is connected to the second switching terminal corresponding to the second common terminal, and the first end of the third charging and discharging coil is connected to the second switching terminal corresponding to the third common terminal.

7. The energy conversion device of claim 1, wherein, The energy conversion device further includes a DC / DC converter, the first end of the DC / DC converter is connected to the first output end of the battery, the second end of the DC / DC converter is connected to the second output end of the battery, the third end of the DC / DC converter is connected to the first end of the bus capacitor, and the fourth end of the DC / DC converter is connected to the second end of the bus capacitor.

8. The energy conversion device of claim 1, wherein, When the energy conversion device is in the driving mode, the battery, the bus capacitor, the bridge arm converter, the first contactor and the motor form a motor driving circuit. When the energy conversion device is in the charging and discharging mode, the battery, the bus capacitor, the bridge arm converter, the first contactor and the charging and discharging module form a charging and discharging circuit. The bus capacitor, the bridge arm converter and the first contactor are reused in the motor driving circuit and the charge-discharge circuit.

9. A control method of an energy conversion device based on the energy conversion device according to any one of claims 1 to 8, characterized by, The control method comprises: acquiring the working mode of the energy conversion device; when the energy conversion device is in the driving mode, controlling the common end of the first contactor to be connected to the first switching end, so that the battery drives the motor to work through the bridge arm converter and the first contactor; when the energy conversion device is in the wireless discharge mode, controlling the common end of the first contactor to be connected to the second switching end, so that the charge-discharge module performs wireless discharge on the energy conversion device to be charged; when the energy conversion device is in the wireless charging mode, controlling the common end of the first contactor to be connected to the second switching end, so that the battery receives the wireless discharge of the energy conversion device to be discharged through the energy conversion device; when the energy conversion device is in the wireless discharge mode or the wireless charging mode, controlling the first contactor by the control module to make the bridge arm converter conduct with the charge-discharge coil, and adjusting the bridge arm converter to realize voltage adjustment; receiving a wireless connection request, and acquiring a charge-discharge mode when the wireless connection is successful; when the charge-discharge mode is the discharge mode, receiving wireless charging parameters, and the wireless charging parameters include the charging power, the power information of the battery to be charged, the time sequence, the switching frequency and the duty cycle of the power switch tube of the bridge arm converter; controlling the common end of the first contactor to be connected to the second switching end, and controlling the bridge arm converter to work according to the wireless charging parameters, so that the charge-discharge module performs wireless discharge on other energy conversion devices.

10. A vehicle characterized by comprising: The vehicle further comprises the energy conversion device and the battery according to any one of claims 1 to 8, and the battery is connected in parallel with the bus capacitor.

11. A charge-discharge system characterized by comprising: comprises: a first energy conversion device and a second energy conversion device, the first energy conversion device comprising: a first bus capacitor, a first end of which is connected to a first output end of a first battery, and a second end of which is connected to a second output end of the first battery; a first bridge arm converter, comprising a plurality of bridge arms, a first end of each bridge arm being connected as a first bus bar, and a second end of each bridge arm being connected as a second bus bar, the first bus bar being connected to the first end of the first bus capacitor, and the second bus bar being connected to the second end of the first bus capacitor; a first contactor, comprising a plurality of common ends, each common end being connected to a middle end of a bridge arm, and each common end corresponding to a first switching end and a second switching end; a first motor, comprising a plurality of motor coils, one end of each motor coil being connected to a first switching end, and the other end of each motor coil being connected in common; a first charge-discharge module, comprising a plurality of charge-discharge coils, one end of each charge-discharge coil being connected to a second switching end, and the other end of each charge-discharge coil being connected in common, the charge-discharge coil being a wireless charge-discharge coil; the second energy conversion device comprising: a second bus capacitor, a first end of which is connected to a first output end of a second battery, and a second end of which is connected to a second output end of the second battery; The second bridge arm converter comprises a plurality of phase bridge arms, the first ends of each phase bridge arm are connected to a first bus bar, the second ends of each phase bridge arm are connected to a second bus bar, the first bus bar is connected to the first end of the second bus capacitor, and the second bus bar is connected to the second end of the second bus capacitor; The second contactor comprises a plurality of common terminals, each common terminal is connected to the middle end of a phase bridge arm, each common terminal is connected to a third switching terminal and a fourth switching terminal; The second motor comprises a plurality of motor coils, one end of each motor coil is connected to a third switching terminal, and the other end of each motor coil is connected to a common terminal; The second charging and discharging module comprises a plurality of charging and discharging coils, one end of each charging and discharging coil is connected to a fourth switching terminal, and the other end of each charging and discharging coil is connected to a common terminal, and the charging and discharging coil is a wireless charging and discharging coil; When the first energy conversion device is in a wireless discharging mode and the second energy conversion device is in a wireless charging mode, the common terminal of the first contactor is connected to a second switching terminal, the common terminal of the second contactor is connected to a fourth switching terminal, the first charging and discharging module performs wireless discharging on the second energy conversion device, and the second battery receives wireless discharging of the first energy conversion device through the second energy conversion device; The first energy conversion device is configured to: receive a wireless connection request, and obtain a charging and discharging mode when the wireless connection is successful; when the charging and discharging mode is a discharging mode, receive wireless charging parameters, the wireless charging parameters comprising charging power, power information of a battery to be charged, a time sequence, a switching frequency and a duty cycle of a power switch tube of the first bridge arm converter; control the common terminal of the first contactor to be connected to a second switching terminal, and control the first bridge arm converter to work according to the wireless charging parameters, so that the first charging and discharging module performs wireless discharging on the second energy conversion device.

12. A control method of the charge and discharge system according to claim 11, characterized by, The control method of the first energy conversion device comprises: receiving a wireless connection request, and obtaining a charging and discharging mode when the wireless connection is successful; when the charging and discharging mode is a discharging mode, receiving wireless charging parameters, the wireless charging parameters comprising charging power, power information of a battery to be charged, a time sequence, a switching frequency and a duty cycle of a power switch tube of the first bridge arm converter; controlling the common terminal of the first contactor to be connected to a second switching terminal, and controlling the first bridge arm converter to work according to the wireless charging parameters, so that the first charging and discharging module performs wireless discharging on the second energy conversion device.

13. The control method according to claim 12, characterized by, The control method of the second energy conversion device comprises: sending a wireless connection request, and obtaining a charging and discharging mode when the wireless connection is successful; when the charging and discharging mode is a charging mode, sending wireless charging parameters; controlling the common terminal of the second contactor to be connected to a fourth switching terminal, and controlling the second bridge arm converter to work according to the wireless charging parameters, so that the second charging and discharging module receives wireless discharging of the first charging and discharging module.

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