Vehicle-mounted charging system, control method and vehicle

Abstract

The invention provides a vehicle-mounted charging system, a control method and a vehicle, and relates to the technical field of vehicle-mounted power supplies, and the system comprises a power module, a voltage transformation module and a power supply module; the first end of the power module is electrically connected with the high-voltage end of the power module, and the second end of the power module is electrically connected with an alternating-current charging device or a motor winding; the first end of the voltage transformation module is electrically connected with the second battery pack, and the second end of the voltage transformation module is electrically connected with the first end of the power module; in the charging mode, the second end of the power module is electrically connected with the alternating current charging device, the power module is used for rectifying alternating current, the voltage transformation module is used for boosting first direct current obtained after rectification so as to charge the second battery pack, and the power supply module is used for reducing the voltage of the first direct current so as to carry out low-voltage power supply; and in the driving motor mode, the second end of the power module is electrically connected with the motor winding, so that the functional integrity is guaranteed on the basis of simplifying the vehicle-mounted charger.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle power supplies, and more specifically, to a vehicle charging system, a control method, and a vehicle. Background Art

[0002] The charging function of electric vehicles is one of their most fundamental and core functions. Currently, vehicle charging methods are mainly divided into two types: direct current (DC) charging and alternating current (AC) charging. In the DC charging method, the voltage output by the charging pile is higher than the voltage of the battery pack, and electrical energy can be directly charged into the battery without current conversion. In the AC charging method, it depends on the mains power. The mains power output by the charging pile needs to go through two conversions: first, rectify the alternating current into direct current, and then boost the voltage to be higher than the battery voltage to charge the battery pack.

[0003] New energy vehicles are equipped with on-vehicle chargers, whose main function is to convert mains power into high-voltage direct current to charge the battery. An on-vehicle charger usually includes two parts: rectification and boosting. During the charging process, a direct current to direct current (DC / DC) component is also required. Due to the relatively large volume of the power modules of the on-vehicle charger and the electric drive, how to reduce the volume while maintaining the original functions has become the focus of the technical improvement of on-vehicle chargers.

[0004] In the related art, by designing the on-vehicle charger integrated in the vehicle as a non-vehicle-mounted charging device, this solution reduces the volume of the components inside the vehicle, but this design is inconvenient to use and carry; in some other technologies, by reusing the boosting module in the power module to boost the input voltage of the charging pile and then charge the power battery, but this solution cannot meet the low-voltage requirements of users during charging, that is, it cannot supply power to low-voltage batteries or vehicle-mounted electrical appliances during charging. Summary of the Invention

[0005] The problem solved by the present invention is how to simplify the on-vehicle charger and ensure the integrity of functions.

[0006] To solve the above problems, the present invention provides a vehicle charging system, a control method, and a vehicle.

[0007] In a first aspect, the present invention provides a vehicle charging system, including a power module, a voltage transformation module, and a power supply module;

[0008] The first end of the power module is electrically connected to the high-voltage end of the power supply module, and the second end of the power module is used to be electrically connected to an AC charging device or a motor winding;

[0009] The first end of the voltage transformation module is electrically connected to a second battery pack, and the second end of the voltage transformation module is electrically connected to the first end of the power module, where the second operating voltage of the second battery pack is higher than the first operating voltage of the power supply module;

[0010] In the charging mode, the second end of the power module is electrically connected to the AC charging device. The power module is used to receive alternating current from the AC charging device and rectify the alternating current. The voltage transformation module is used to boost the first direct current obtained after rectification to charge the second battery pack. The power supply module is used to step down the first direct current for low-voltage power supply.

[0011] In the drive motor mode, the second end of the power module is electrically connected to the motor winding. The voltage transformation module is used to step down the second direct current output by the second battery pack. The power module is used to invert the stepped-down electrical energy output by the voltage transformation module and supply power to the motor winding.

[0012] Optionally, the vehicle-mounted charging system further includes a first load power supply module. The input end of the first load power supply module is electrically connected to the second end of the voltage transformation module.

[0013] In the drive motor mode, the first load power supply module is used to process the stepped-down electrical energy output by the voltage transformation module for low-voltage power supply.

[0014] Optionally, the second end of the voltage transformation module is also electrically connected to the high-voltage end of the power supply module.

[0015] In the external discharge mode, the second end of the power module is electrically connected to an external load. The voltage transformation module is used to step down the second direct current output by the second battery pack. The power module is used to invert the stepped-down electrical energy output by the voltage transformation module and supply power to the external load. The power supply module is used to step down the stepped-down electrical energy output by the voltage transformation module for low-voltage power supply.

[0016] Optionally, in the energy recovery mode, the second end of the power module is electrically connected to the motor winding. The power module is used to receive the electrical energy generated by the motor winding during energy recovery and rectify the electrical energy of energy recovery. The voltage transformation module is used to boost the third direct current obtained after rectification to charge the second battery pack. The power supply module is used to step down the third direct current for low-voltage power supply.

[0017] Optionally, the vehicle-mounted charging system further includes a switch module. The switch module includes a first switch, a second switch, a third switch, a fourth switch, and a buck switch.

[0018] The first switch is disposed between the motor winding and the second end of the power module and is used to control the on / off between the motor winding and the power module.

[0019] In the charging mode, the second switch is disposed between the second end of the power module and the AC charging device to control the connection and disconnection between the power module and the AC charging device; in the external discharging mode, the second switch is disposed between the second end of the power module and an external load to control the connection and disconnection between the power module and the external load.

[0020] The third switch is disposed between the input end of the first load power supply module and the second end of the voltage transformation module to control the connection and disconnection between the voltage transformation module and the first load power supply module.

[0021] The fourth switch is disposed between the second end of the voltage transformation module and a target connection point to control the connection and disconnection between the voltage transformation module and the power module and between the voltage transformation module and the power supply module, where the target connection point is the connection point between the first end of the power module and the high-voltage end of the power supply module.

[0022] The buck switch is disposed between the first end of the power module and the power supply module to control the connection and disconnection between the power module and the power supply module.

[0023] Optionally, in the charging mode, the second switch, the fourth switch, and the buck switch are closed, the first switch and the third switch are open, the AC charging device, the power module, the voltage transformation module, and the second battery pack are electrically connected, and the power supply module is electrically connected to the power module through the buck switch.

[0024] In the driving motor mode, the first switch, the third switch, and the fourth switch are closed, and the second switch and the buck switch are open.

[0025] Optionally, in the external discharging mode, the second switch, the fourth switch, and the buck switch are closed, and the first switch and the third switch are open.

[0026] And / or, in the energy recovery mode, the first switch, the fourth switch, and the buck switch are closed, and the second switch and the third switch are open.

[0027] Optionally, the switch module further includes a fifth switch and a sixth switch, the transformer module includes a first full-bridge circuit, a first primary winding, a second primary winding, a secondary winding and a second full-bridge circuit. The first end of the first full-bridge circuit serves as the first end of the transformer module, the second end of the first full-bridge circuit is electrically connected to the secondary winding, the first primary winding is electrically connected to the first end of the second full-bridge circuit through the fifth switch, the second primary winding is electrically connected to the first end of the second full-bridge circuit through the sixth switch, the second end of the second full-bridge circuit serves as the second end of the transformer module, and the number of turns of the first primary winding is less than that of the second primary winding;

[0028] In the charging mode and / or the external discharging mode, the fifth switch is closed and the sixth switch is open;

[0029] And / or, in the driving motor mode and / or the energy recovery mode, the sixth switch is closed and the fifth switch is open.

[0030] In a second aspect, the present invention provides a control method for an in-vehicle charging system. The control method for the in-vehicle charging system includes:

[0031] Obtaining the current gear position of the vehicle, where the vehicle includes the in-vehicle charging system as described in the first aspect;

[0032] When the current gear position is a non-driving gear position, determining whether the vehicle is connected to an AC charging device;

[0033] When connected to the AC charging device, switching the in-vehicle charging system to the charging mode until the energy storage of the second battery pack reaches the state-of-charge threshold;

[0034] When not connected to the AC charging device, in response to a motor driving instruction, switching the in-vehicle charging system to the driving motor mode.

[0035] In a third aspect, the present invention further provides a vehicle, including a memory and a processor, where a computer program is stored in the memory; when the computer program is read and run by the processor, the control method for the in-vehicle charging system as described in the second aspect is implemented.

[0036] The beneficial effects of the in-vehicle charging system of the present invention are:

[0037] One end of the power module is connected to the high-voltage end of the power supply module, and the other end is connected to the AC charging device or the motor winding, enabling the power module to flexibly switch between different modes (charging or driving) to adapt to the changing working environment. One end of the voltage transformation module is connected to the second battery pack, and the other end is connected to the power module. Moreover, the working voltage of the second battery pack is higher than that of the power supply module, and the voltage transformation module can be used to step up or step down the electric energy to match different voltage requirements, ensuring the distribution and use of electricity. In the charging mode, the power module receives alternating current from the AC charging device and rectifies it into direct current; the voltage transformation module further steps up this direct current for charging the second battery pack, simplifying the design of the on-vehicle charger and allowing the external charging device to be directly used without additional complex conversion equipment. The power supply module can step down the rectified electric energy to meet both high-voltage and low-voltage power supply requirements. In the motor driving mode, the power module receives the stepped-down electric energy from the voltage transformation module and inversely transforms it into a current form suitable for the motor, ensuring the power supply required for the motor operation. It can not only effectively manage the charging and discharging of the second battery pack but also provide stable low-voltage power support simultaneously. By reusing the power module of the electric drive for battery charging, while simplifying the on-vehicle charger, the functional integrity of the on-vehicle charger is ensured. Description of the Drawings

[0038] Figure 1 System block diagram of the on-vehicle charging system according to an embodiment of the present invention;

[0039] Figure 2 Circuit topology diagram of the on-vehicle charging system according to an embodiment of the present invention;

[0040] Figure 3 Flow schematic diagram of the control method of the on-vehicle charging system according to an embodiment of the present invention;

[0041] Figure 4 Example diagram of the vehicle according to an embodiment of the present invention. Detailed Embodiments

[0042] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the specific embodiments of the present invention is provided in conjunction with the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments described herein. On the contrary, these embodiments are provided to more thoroughly and completely understand the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not used to limit the protection scope of the present invention.

[0043] It should be understood that the various steps described in the method embodiments of the present invention can be executed in different orders and / or executed in parallel. In addition, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present invention is not limited in this regard.

[0044] As used herein, the term "including" and its variants are open-ended, i.e., "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts such as "first" and "second" mentioned in the present invention are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0045] It should be noted that the modifications of "one" and "plural" mentioned in the present invention are illustrative rather than restrictive. Those skilled in the art should understand that unless otherwise clearly stated in the context, it should be understood as "one or more".

[0046] The names of the messages or information exchanged between multiple devices in the embodiments of the present invention are only for illustrative purposes and are not used to limit the scope of these messages or information.

[0047] In view of the problems existing in the above related technologies, this embodiment provides an in-vehicle charging system, a control method and a vehicle.

[0048] As Figure 1 shown, an in-vehicle charging system provided by an embodiment of the present invention includes a power module, a voltage transformation module and a power supply module;

[0049] The first end of the power module is electrically connected to the high-voltage end of the power supply module, and the second end of the power module is used to be electrically connected to an AC charging device or a motor winding.

[0050] In one embodiment, the power module is a power module of an electric drive, which is responsible for converting the direct current provided by the power battery into the alternating current required to drive the motor, or converting the electric energy of the motor or an external input into the direct current that can be stored in the power battery. The power supply module is used to supply power to the first battery pack. Since the voltage output from the power module to the power supply module is higher than the rated voltage of the first battery pack, the power supply module has a step-down function to convert the high-voltage power from the power module or other external inputs into low-voltage power; the second end of the power module is electrically connected to the AC charging device or the motor winding.

[0051] The first end of the voltage conversion module is electrically connected to the second battery pack, and the second end of the voltage conversion module is electrically connected to the first end of the power module. Wherein, the second operating voltage of the second battery pack is higher than the first operating voltage of the power supply module.

[0052] In one embodiment, the voltage conversion module is a bidirectional DC / DC voltage conversion module, which can adjust the voltage parameters according to the current direction: when the current is delivered to the second battery pack, it is boosted to a voltage value suitable for charging; when the current is output from the second battery pack, it is reduced to a voltage standard matching the load operation.

[0053] In the charging mode, the second end of the power module is electrically connected to the AC charging device. The power module is used to receive the alternating current from the AC charging device and rectify the alternating current. The voltage conversion module is used to boost the first direct current obtained after rectification to charge the second battery pack. The power supply module is used to step down the first direct current for low-voltage power supply. In the driving motor mode, the second end of the power module is electrically connected to the motor winding. The voltage conversion module is used to step down the second direct current output by the second battery pack. The power module is used to invert the stepped-down electrical energy output by the voltage conversion module and supply power to the motor winding.

[0054] When the vehicle is in the charging mode, the voltage conversion module performs a boosting operation according to the direction of power transmission. The power module performs AC-DC conversion processing on the input electrical energy and rectifies the externally input alternating current into direct current. The processed electrical energy is transmitted to the power supply module through two paths: one is the DC electrical energy after the voltage is adjusted by the voltage conversion module, and the other is the DC electrical energy rectified by the power module. The power supply module converts the received electrical energy into low-voltage direct current to provide power support for in-vehicle low-voltage devices. This embodiment realizes multi-path conversion of electrical energy and stable output of low-voltage power supply in the non-driving state through the coordinated cooperation between modules, and at the same time avoids interference with the original charging of the vehicle.

[0055] In this embodiment, one end of the power module is connected to the high-voltage end of the power supply module, and the other end is connected to the AC charging device or the motor winding, enabling the power module to flexibly switch between different modes (charging or driving) to adapt to the changing working environment. One end of the voltage transformation module is connected to the second battery pack, and the other end is connected to the power module. Moreover, the working voltage of the second battery pack is higher than that of the power supply module, enabling the voltage transformation module to step up or step down the electric energy to match different voltage requirements, ensuring the effective distribution and use of electricity. In the charging mode, the power module receives alternating current from the AC charging device and rectifies it into direct current; the voltage transformation module further steps up this direct current for charging the second battery pack, simplifying the design of the on-vehicle charger and allowing the direct use of external charging devices without additional complex conversion equipment. The power supply module can step down the rectified electric energy to meet both high-voltage and low-voltage power supply requirements. In the motor driving mode, the power module receives the stepped-down electric energy from the voltage transformation module and inverses it into a current form suitable for the motor, ensuring the power supply required for the motor operation. It can not only effectively manage the charging and discharging of the second battery pack but also provide stable low-voltage power supply support simultaneously, ensuring the functional integrity of the on-vehicle charger while simplifying it.

[0056] By canceling the independent rectification unit in the traditional on-vehicle charger and using the existing power devices in the drive system to complete AC-DC conversion; by reusing the boost circuit in the drive system to achieve voltage boost and eliminating the separate boost module. When the high-voltage battery pack is directly used as the charging power source, the boost link can be skipped for direct charging; in the charging condition, the power module performs the rectification function; in the discharging condition, the inversion operation is achieved through the same power module; during the high-voltage charging process, an independent circuit is used to maintain the continuous power supply of the 12V on-vehicle power supply, avoiding the design of additional DC / DC converters in the traditional solution. When charging the second battery pack, the electric energy flows in from the outside. After being rectified by the power module, one part of the electric energy supplies power to the power supply module, and the other part of the electric energy supplies power to the second battery pack through the voltage transformation module; when the second battery pack discharges, the electric energy passes through the voltage transformation module. One part is inverted by the power module to supply power to the motor winding, and the other part supplies power to the power supply module before the power module, realizing the reuse of the on-vehicle charger and the electric drive power module, and being able to supply power to the second battery pack / AC charging device / motor winding and the power supply module simultaneously during charging and discharging, ensuring the functional integrity while simplifying the on-vehicle charger module.

[0057] Optionally, the on-vehicle charging system further includes a first load power supply module, and the input end of the first load power supply module is electrically connected to the second end of the voltage transformation module;

[0058] In the motor driving mode, the first load power supply module is used to process the stepped-down electric energy output by the voltage transformation module to supply power to low-voltage loads.

[0059] In the driving motor mode, the second end of the power module is connected to the motor winding. The voltage transformation module steps down the second direct current output by the second battery pack. The first load power supply module further processes the stepped-down electrical energy output by the voltage transformation module to meet the low-voltage power supply requirements, ensuring sufficient power supply for the motor winding while effectively supporting other in-vehicle devices that require low-voltage power supply.

[0060] As Figure 1 As shown, the on-vehicle charging device provided by the embodiment of the present invention may further include a voltage dividing module. In the driving motor mode, the second direct current output by the second battery pack is voltage-adjusted by the voltage transformation module. The adjusted electrical energy is divided into two paths: the first path of electrical energy enters the power module for inversion after being processed by the voltage dividing module, and finally outputs alternating current to the motor winding or an external load; the second path of electrical energy undergoes voltage dividing processing and is then directly supplied to the first load power supply module to meet the low-voltage power supply requirements.

[0061] The second direct current from the second battery pack is flexibly distributed among different requirements, capable of meeting the needs of high-voltage and high-power devices and providing a stable power supply for in-vehicle low-voltage electrical appliances, enhancing the applicability and flexibility of the entire system. By reasonably configuring the functions of each module, not only is the electrical energy usage efficiency optimized, but also effective support for various load types is ensured.

[0062] In one embodiment, the second end of the power module is connected to the three-phase motor winding circuit, the input end of the voltage dividing module is arranged to be connected to the second end of the voltage transformation module, its first output end is connected to the DC bus of the power module, and the second output end is connected to the low-voltage load power supply line; a bidirectional power semiconductor switch group is provided between the voltage transformation module and the second battery pack.

[0063] In this embodiment, when starting the vehicle, the positive contactor between the second battery pack and the voltage transformation module is closed. The second battery pack outputs 650V second direct current, which is stepped down to the 400V level by the voltage transformation module. The voltage dividing module distributes the 400V electrical energy in a 3:1 ratio. The 300V line is connected to the DC side of the power module and is inverted by the power module into three-phase 380V alternating current to drive the motor; the 100V line is input to the first load power supply module, and through a Buck circuit, the first direct current is converted into 12V direct current to supply in-vehicle devices.

[0064] By supplying power to the drive circuit and the first load power supply module simultaneously through the voltage dividing module, the need for setting an independent DC / DC converter in the traditional solution is eliminated. The same power module performs inversion (driving) and rectification (charging) operations, eliminating the need for an independent charging rectifier bridge and reducing the volume of components.

[0065] As Figure 1 As shown, optionally, the second end of the voltage transformation module is also electrically connected to the high-voltage end of the power supply module;

[0066] In the external power discharge mode, the second end of the power module is electrically connected to an external load. The voltage transformation module is used to step down the second direct current output by the second battery pack. The power module is used to invert the stepped-down electrical energy output by the voltage transformation module and supply power to the external load. The power supply module is used to step down the stepped-down electrical energy output by the voltage transformation module for low-voltage power supply.

[0067] In one embodiment, the direction of electrical energy flow in the external power discharge mode is opposite to that in the charging mode. The second battery pack outputs the second direct current to the voltage transformation module. After being stepped down by the voltage transformation module, it is inverted by the power module to supply power to the external load. At the same time, the electrical energy stepped down by the voltage transformation module is input into the power supply module for further stepping down, and while supplying power to the external load, it also supplies power to low-voltage loads.

[0068] Optionally, in the energy recovery mode, the second end of the power module is electrically connected to the motor winding. The power module is used to receive the electrical energy generated by the motor winding during energy recovery and rectify the electrical energy recovered. The voltage transformation module is used to step up the third direct current obtained after rectification to charge the second battery pack. The power supply module is used to step down the third direct current for low-voltage power supply.

[0069] In the energy recovery mode, the second end of the power module is electrically connected to the motor winding. The power module receives the electrical energy generated by the motor winding during energy recovery and performs rectification processing on these electrical energies, converting them into a third direct current. Among them, on the one hand, the third direct current can be input into the voltage transformation module for stepping up and stored in the second battery pack; on the other hand, it can be input into the power supply module for stepping down to achieve simultaneous power supply to the high-voltage battery pack and low-voltage loads.

[0070] Optionally, as Figure 2 shown, the on-vehicle charging system further includes a switch module. The switch module includes a first switch K1, a second switch K2, a third switch K3, a fourth switch K4, and a step-down switch P7;

[0071] The first switch K1 is arranged between the motor winding and the second end of the power module and is used to control the on-off between the motor winding and the power module;

[0072] In the charging mode, the second switch K2 is arranged between the second end of the power module and the AC charging device and is used to control the on-off between the power module and the AC charging device; in the external power discharge mode, the second switch K2 is arranged between the second end of the power module and the external load and is used to control the on-off between the power module and the external load;

[0073] The third switch K3 is arranged between the input end of the first load power supply module and the second end of the voltage transformation module, and is used to control the on-off between the voltage transformation module and the first load power supply module;

[0074] The fourth switch K4 is arranged between the second end of the voltage transformation module and the target connection point, and is used to control the on-off between the voltage transformation module and the power module and between the voltage transformation module and the power supply module. The target connection point is the connection point between the first end of the power module and the high-voltage end of the power supply module;

[0075] The buck switch P7 is arranged between the first end of the power module and the power supply module, and is used to control the on-off between the power module and the power supply module.

[0076] In one embodiment, the buck switch P7 is a power device and is used to step down the electric energy input to the power supply module.

[0077] Optionally, as Figure 2 shown, in the charging mode, the second switch K2, the fourth switch K4, and the buck switch P7 are closed, the first switch K1 and the third switch K3 are opened, the AC charging device, the power module, the voltage transformation module, and the second battery pack are conducted, and the power supply module is conducted with the power module through the buck switch;

[0078] In the driving motor mode, the first switch K1, the third switch K3, and the fourth switch K4 are closed, and the second switch K2 and the buck switch P7 are opened.

[0079] In the charging mode, the second switch K2 is arranged between the AC charging device and the power module, and the fourth switch K4 is arranged between the power module and the voltage transformation module and between the power module and the second battery pack. In the charging mode, by controlling the second switch K2 and the fourth switch K4 to be closed, the AC end, the power module, the voltage transformation module, and the second battery pack are connected, and the electric energy supply between the second battery pack and the AC end or between the AC end and the second battery pack is realized; by controlling the buck switch P7, while realizing the electric energy supply, power is supplied to the low-voltage load, that is, electric energy is output to the power supply module.

[0080] In the driving motor mode, the first switch K1, the third switch K3, and the fourth switch K4 are closed, and the buck switch P7 is open. The second battery pack steps down the output high-voltage electricity through the voltage conversion module. The first path of electric energy is divided by the first voltage division unit provided in the first load power supply module and then output to the first load power supply module; the second path of electric energy is divided by the second voltage division unit provided at the first end of the power module and then output to the power module. After being inverted by the power module, it is output to the motor winding to drive the motor to work.

[0081] Optionally, as Figure 2 shown, in the external discharge mode, the second switch K2, the fourth switch K4, and the buck switch P7 are closed, and the first switch K1 and the third switch K3 are open;

[0082] And / or, in the energy recovery mode, the first switch K1, the fourth switch K4, and the buck switch P7 are closed, and the second switch K2 and the third switch K3 are open.

[0083] In the external discharge mode, the second switch K2 and the fourth switch K4 are closed to connect the second battery pack, the voltage conversion module, the power module, and the external load. The electric energy output by the second battery pack is transformed by the voltage conversion module and then input to the power module for inversion to obtain alternating current for powering the external load. At the same time, the electric energy transformed by the voltage conversion module is stepped down by the buck switch P7 to power the power supply module. In the energy recovery mode, the first switch K1, the fourth switch K4, and the buck switch P7 are closed to connect the motor winding, the power module, the voltage conversion module, and the second battery pack to achieve kinetic energy recovery. At the same time, the motor winding, the power module, and the power supply module are connected, and the electric energy is rectified by the power module. By controlling the opening and closing of the buck switch P7, the voltage is reduced to a voltage suitable for the power supply module.

[0084] Optionally, as Figure 2 shown, the switch module further includes a fifth switch K5 and a sixth switch K6. The voltage conversion module includes a first full-bridge circuit, a first primary winding, a second primary winding, a secondary winding, and a second full-bridge circuit. The first end of the first full-bridge circuit serves as the first end of the voltage conversion module. The second end of the first full-bridge circuit is electrically connected to the secondary winding. The first primary winding is electrically connected to the first end of the second full-bridge circuit through the fifth switch. The second primary winding is electrically connected to the first end of the second full-bridge circuit through the sixth switch. The second end of the second full-bridge circuit serves as the second end of the voltage conversion module. The number of turns of the first primary winding is less than that of the second primary winding;

[0085] In the charging mode and / or the external discharge mode, the fifth switch K5 is closed and the sixth switch K6 is open;

[0086] And / or, in the driving motor mode and / or the energy recovery mode, the sixth switch K6 is closed and the fifth switch K5 is opened.

[0087] In one embodiment, the switch module further includes a fifth switch K5 and a sixth switch K6 for controlling the turn ratio of the primary winding and the secondary winding. One end of the voltage transformation module connected to the second battery pack is used as the first end of the voltage transformation module, and one end of the voltage transformation module connected to the third switch K3 or the fourth switch K4 is used as the second end of the voltage transformation module.

[0088] The first full-bridge circuit is electrically connected to the second battery pack and the secondary winding respectively; the first end of the second full-bridge circuit is electrically connected to the first primary winding through the fifth switch K5. When the fifth switch K5 is closed and the sixth switch K6 is opened, the first primary winding is turned on to form a transformer with the secondary winding for voltage transformation. In the charging mode, the electric energy from the AC charging pile is rectified by the power module and then boosted through the first primary winding and the secondary winding to obtain a voltage suitable for charging the second battery pack; it is also used to step down the voltage output by the second battery pack to a voltage suitable for external discharge in the external discharge mode.

[0089] The first end of the second full-bridge circuit is also electrically connected to the second primary winding through the sixth switch K6. When the sixth switch K6 is closed and the fifth switch K5 is opened, the second primary winding is turned on to form a transformer with the secondary winding for voltage transformation. In the driving motor mode, the voltage from the second battery pack is stepped down through the transformer formed by the second primary winding and the secondary winding to obtain a voltage suitable for driving the motor winding to work; in the energy recovery mode, the voltage from the motor winding is rectified by the power module and then boosted through the transformer formed by the second primary winding and the secondary winding for charging the second battery pack.

[0090] As Figure 3 shown, an embodiment of the present invention further provides a control method for an in-vehicle charging system, and the control method for the in-vehicle charging system includes:

[0091] Step S100, obtaining the current gear of the vehicle, where the vehicle includes the in-vehicle charging system as described in the first aspect.

[0092] Step S200, when the current gear is a non-driving gear, determining whether the vehicle is connected to an AC charging device.

[0093] In one embodiment, it is determined whether the vehicle is in a driving state according to the current gear of the vehicle. If the gear of the vehicle is in the D gear, it means that the vehicle is in a driving state and the in-vehicle charging system cannot be switched to the charging mode or the discharging mode. If the vehicle is in other gears, such as the P gear, it is further determined whether the vehicle is connected to an AC charging device, such as an external charging gun.

[0094] Step S300, when connecting to the AC charging device, switch the in-vehicle charging system to the charging mode until the energy storage of the second battery pack reaches the state-of-charge threshold.

[0095] When connecting to the AC charging device, disconnect the first switch, the third switch, and the sixth switch, close the second switch, the fourth switch, and the fifth switch, switch the mode of the in-vehicle charging system to the charging mode or the discharging mode, and further determine whether to switch to the AC charging mode or the external discharging mode according to the type of the AC charging device. For example, when the AC charging device is an AC charging gun, switch to the AC charging mode.

[0096] In one embodiment, in response to the external discharging control signal and when connecting to an external load, switch the in-vehicle charging system to the external discharging mode; in response to the charging control signal and when connecting to a charging gun, switch to the charging mode. For example, when connecting to the AC charging device, identify the type of the AC charging device through the in-vehicle charging system, such as the communication initialization process, to determine the basic information of the AC charging device, and in response to the control signal, perform charging or external discharging. In another embodiment, when the AC charging device is a charging gun and the control signal received by the in-vehicle charging system is the external discharging control signal, since the AC charging device does not match the control signal, the in-vehicle charging system does not respond.

[0097] Optionally, the state-of-charge threshold includes a maximum threshold and a minimum threshold.

[0098] Among them, when connecting to the AC charging gun, the state-of-charge threshold is the maximum threshold, that is, when the vehicle is charging, switch the in-vehicle charging system to the charging mode until the state-of-charge threshold of the second battery pack reaches the maximum threshold, that is, exit the AC charging mode when fully charged; when connecting to an external load, the state-of-charge threshold is the minimum threshold, that is, when the vehicle is externally discharging, switch the in-vehicle charging system to the external discharging mode until the state-of-charge threshold of the second battery pack reaches the minimum threshold, that is, exit the external discharging mode when the vehicle externally discharges until the power is low.

[0099] In one embodiment, when the vehicle gear is in the drive gear (i.e., D gear), in response to the driver's driving signal (such as stepping on the drive pedal), externally discharge through the second battery pack to make the drive motor winding work, and at this time the vehicle is in the drive motor mode; when the vehicle gear is in the drive gear and the driver does not trigger the driving signal (such as stepping on the brake pedal or no action), the kinetic energy generated by the drive motor winding is converted into electrical energy and charges the power supply module and the second battery pack, and the vehicle is in the kinetic energy recovery mode.

[0100] Step S400, when not connecting to the AC charging device, in response to the motor drive instruction, switch the in-vehicle charging system to the drive motor mode.

[0101] When the vehicle is not in a driving state and not connected to an AC charging device, disconnect the second switch and the fifth switch, and close the first switch, the third switch, and the sixth switch, so that the electric drive is in a driving or standby driving state.

[0102] As Figure 4 shown, a vehicle 400 provided by an embodiment of the present invention includes a memory 410 and a processor 420; the memory 410 is used to store a computer program; the processor 420 is used to implement the in-vehicle charging system control method as described in the second aspect when executing the computer program.

[0103] Or, a vehicle 400 includes a memory 410 and a processor 420 coupled to the memory 410; the memory 410 is configured to store a computer program; the processor 420 is configured to perform the following operations when executing the computer program:

[0104] Obtain the current gear of the vehicle, where the vehicle includes the in-vehicle charging system as described in the first aspect;

[0105] When the current gear is a non-driving gear, determine whether the vehicle is connected to an AC charging device;

[0106] When connected to the AC charging device, switch the in-vehicle charging system to the charging mode until the energy storage of the second battery pack reaches the state-of-charge threshold;

[0107] When not connected to the AC charging device, in response to a motor driving instruction, switch the in-vehicle charging system to the drive motor mode.

[0108] A computer-readable storage medium provided by an embodiment of the present invention has a computer program stored thereon. When the computer program is executed by a processor, the in-vehicle charging system control method as described in the second aspect is implemented.

[0109] Or, a non-volatile computer-readable storage medium has a computer program stored thereon. When the computer program is executed by a processor, the processor is caused to perform the following operations:

[0110] Obtain the current gear of the vehicle, where the vehicle includes the in-vehicle charging system as described in the first aspect;

[0111] When the current gear is a non-driving gear, determine whether the vehicle is connected to an AC charging device;

[0112] When connected to the AC charging device, switch the in-vehicle charging system to the charging mode until the energy storage of the second battery pack reaches the state-of-charge threshold;

[0113] When the AC charging device is not connected, in response to a motor driving instruction, switch the in-vehicle charging system to the drive motor mode.

[0114] Vehicle 400, which can be a server or a client of the present invention, will now be described. It is an example of a hardware device to which various aspects of the present invention can be applied. Vehicle 400 is intended to represent various forms of digital electronic computer devices, such as, laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. Vehicle 400 can also represent various forms of mobile devices, such as, personal digital assistants, cellular phones, smart phones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or claimed herein.

[0115] Vehicle 400 includes a computing unit that can perform various appropriate actions and processes according to a computer program stored in a read-only memory (ROM) or a computer program loaded from a storage unit into a random access memory (RAM). In the RAM, various programs and data required for device operation can also be stored. The computing unit, ROM, and RAM are connected to each other via a bus. An input / output (I / O) interface is also connected to the bus.

[0116] Those of ordinary skill in the art can understand that all or part of the processes of implementing the methods in the above embodiments can be completed by instructing relevant hardware through a computer program. The program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above methods. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM), etc. In this application, the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiments of the present invention. In addition, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The above integrated units can be implemented in the form of hardware or in the form of software functional units.

[0117] Although the present invention is disclosed as above, the scope of protection of the present invention is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will all fall within the scope of protection of the present invention.

Claims

1. A vehicle-mounted charging system, characterized in that, It includes a power module, a voltage transformation module, and a power supply module; The first end of the power module is electrically connected to the high-voltage end of the power supply module, and the second end of the power module is used to be electrically connected to an AC charging device or a motor winding; The first end of the voltage transformation module is electrically connected to a second battery pack, and the second end of the voltage transformation module is electrically connected to the first end of the power module, wherein the second operating voltage of the second battery pack is higher than the first operating voltage of the power supply module; In the charging mode, the second end of the power module is electrically connected to the AC charging device, the power module is used to receive alternating current from the AC charging device and rectify the alternating current, the voltage transformation module is used to boost the first direct current obtained after rectification to charge the second battery pack, and the power supply module is used to step down the first direct current for low-voltage power supply; In the driving motor mode, the second end of the power module is electrically connected to the motor winding, the voltage transformation module is used to step down the second direct current output by the second battery pack, and the power module is used to invert the stepped-down electrical energy output by the voltage transformation module to supply power to the motor winding.

2. The in-vehicle charging system according to claim 1, wherein The vehicle-mounted charging system further includes a first load power supply module, and the input end of the first load power supply module is electrically connected to the second end of the voltage transformation module; In the driving motor mode, the first load power supply module is used to process the stepped-down electrical energy output by the voltage transformation module for low-voltage power supply.

3. The in-vehicle charging system according to claim 1, wherein The second end of the voltage transformation module is also electrically connected to the high-voltage end of the power supply module; In the external power discharge mode, the second end of the power module is electrically connected to an external load, the voltage transformation module is used to step down the second direct current output by the second battery pack, the power module is used to invert the stepped-down electrical energy output by the voltage transformation module to supply power to the external load, and the power supply module is used to step down the stepped-down electrical energy output by the voltage transformation module for low-voltage power supply.

4. The vehicle-mounted charging system according to claim 1, wherein In the energy recovery mode, the second end of the power module is electrically connected to the motor winding, the power module is used to receive the electrical energy generated by the motor winding for energy recovery and rectify the electrical energy for energy recovery, the voltage transformation module is used to boost the third direct current obtained after rectification to charge the second battery pack, and the power supply module is used to step down the third direct current for low-voltage power supply.

5. The in-vehicle charging system according to claim 2, wherein, The vehicle-mounted charging system further includes a switch module, and the switch module includes a first switch, a second switch, a third switch, a fourth switch, and a buck switch; The first switch is arranged between the motor winding and the second end of the power module and is used to control the on-off between the motor winding and the power module; In the charging mode, the second switch is disposed between the second end of the power module and the AC charging device to control the connection and disconnection between the power module and the AC charging device; in the external discharging mode, the second switch is disposed between the second end of the power module and an external load to control the connection and disconnection between the power module and the external load; The third switch is disposed between the input end of the first load power supply module and the second end of the transformer module to control the connection and disconnection between the transformer module and the first load power supply module; The fourth switch is disposed between the second end of the transformer module and a target connection point, which is the connection point between the first end of the power module and the high-voltage end of the power supply module, to control the connection and disconnection between the transformer module and the power module and between the transformer module and the power supply module; The buck switch is disposed between the first end of the power module and the power supply module to control the connection and disconnection between the power module and the power supply module.

6. The in-vehicle charging system according to claim 5, wherein in the charging mode, the second switch, the fourth switch, and the buck switch are closed, the first switch and the third switch are open, the AC charging device, the power module, the transformer module, and the second battery pack are electrically connected, and the power supply module is electrically connected to the power module through the buck switch; in the drive motor mode, the first switch, the third switch, and the fourth switch are closed, and the second switch and the buck switch are open.

7. The in-vehicle charging system according to claim 5, characterized in that, in the external discharging mode, the second switch, the fourth switch, and the buck switch are closed, and the first switch and the third switch are open; and / or, in the energy recovery mode, the first switch, the fourth switch, and the buck switch are closed, and the second switch and the third switch are open.

8. The in-vehicle charging system according to claim 5, characterized in that, The switch module further includes a fifth switch and a sixth switch. The transformer module includes a first full-bridge circuit, a first primary winding, a second primary winding, a secondary winding, and a second full-bridge circuit. The first end of the first full-bridge circuit serves as the first end of the transformer module. The second end of the first full-bridge circuit is electrically connected to the secondary winding. The first primary winding is electrically connected to the first end of the second full-bridge circuit through the fifth switch. The second primary winding is electrically connected to the first end of the second full-bridge circuit through the sixth switch. The second end of the second full-bridge circuit serves as the second end of the transformer module. The number of turns of the first primary winding is less than that of the second primary winding; in the charging mode and / or the external discharging mode, the fifth switch is closed and the sixth switch is open; and / or, in the drive motor mode and / or the energy recovery mode, the sixth switch is closed and the fifth switch is open.

9. A control method for an in-vehicle charging system, characterized in that, The method for controlling the in-vehicle charging system includes: obtaining the current gear of the vehicle, where the vehicle includes the in-vehicle charging system according to any one of claims 1-8; When the current gear is a non-driving gear, determine whether the vehicle is connected to an AC charging device; When connected to the AC charging device, switch the in-vehicle charging system to the charging mode until the energy storage of the second battery pack reaches the state-of-charge threshold; When not connected to the AC charging device, in response to a motor drive command, switch the in-vehicle charging system to the drive motor mode.

10. A vehicle, characterized in that, It includes a memory and a processor, and a computer program is stored in the memory; when the computer program is read and run by the processor, the in-vehicle charging system control method as described in claim 9 is implemented.

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