Vehicle charging control method, vehicle charging system and vehicle

Abstract

The invention provides a vehicle charging control method, a vehicle charging system and a vehicle. The vehicle charging control method comprises the steps that after a first charging port of a vehicle is connected with a first charging pile, first insulation detection voltage of the first charging port is obtained; and according to the magnitude relationship between the first insulation detection voltage and the highest allowable charging voltage of the vehicle, controlling a boost charging circuit to work, and performing boost conversion on the charging voltage provided by the first charging pile to charge the power battery, or the direct charging circuit is controlled to work to receive the charging voltage provided by the first charging pile to directly charge the power battery. According to the vehicle charging control method, any charging port in the vehicle charging system can be compatible with the high-voltage charging pile and the low-voltage charging pile.

Description

Technical Field

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

[0002] As the country promotes the development of new energy vehicles, electric vehicles are becoming more and more popular. However, in the process of development, it is gradually discovered that consumers have an increasing demand for rapid energy replenishment of electric vehicles. Therefore, a variety of high-power charging or battery replacement rapid energy replenishment solutions have been generated. Among them, the dual-gun charging solution can not only utilize existing facilities, but also increase the charging rate, and can well meet the current demand for rapid energy replenishment in terms of cost performance. However, for the 800V vehicle high-voltage system architecture, only two high-voltage charging piles are supported for charging, and one high-voltage and one low-voltage or two low-voltage charging piles cannot be supported for charging at the same time. Summary of the invention

[0003] In order to solve the above technical problems or at least partially solve the above technical problems, the present disclosure provides a vehicle charging control method, a vehicle charging system and a vehicle.

[0004] To achieve the above-mentioned object, the first aspect of the present application provides a vehicle charging control method, the vehicle charging control method comprising:

[0005] After a first charging port of a vehicle is connected to a first charging pile, obtaining a first insulation detection voltage of the first charging port; and

[0006] According to the relationship between the first insulation detection voltage and the maximum allowable charging voltage of the vehicle, the boost charging circuit is controlled to charge the power battery after boosting the charging voltage provided by the first charging pile, or the direct charging circuit is controlled to charge the power battery directly after receiving the charging voltage provided by the first charging pile.

[0007] The vehicle charging control method provided in the present application, by setting a boost charging circuit and a direct charging circuit, and selectively controlling the operation of the boost charging circuit or the direct charging circuit according to the first insulation detection voltage of the first charging port, can make any charging port in the vehicle charging system compatible with high-voltage charging piles and low-voltage charging piles, with higher compatibility and wider applicability.

[0008] The second aspect of the present application also provides a vehicle charging system, which includes two charging ports, a boost charging circuit, a direct charging circuit and a control module, wherein the first end of the boost charging circuit and the first end of the direct charging circuit are electrically connected to the two charging ports respectively, the second end of the boost charging circuit and the second end of the direct charging circuit are suitable for being electrically connected to a power battery, the control module is electrically connected to the two charging ports, the boost charging circuit and the direct charging circuit, and is used to control the execution of the steps in the vehicle charging control method described in the first aspect above.

[0009] The third aspect of the present application also provides a vehicle, which includes a power battery and the vehicle charging system described in the second aspect.

[0010] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a schematic diagram of the topological structure of a vehicle charging system provided in an embodiment of the present application;

[0012] Figure 2 It is a flow chart of the vehicle charging control method provided in an embodiment of the present application.

[0013] The following are the descriptions of the reference numerals:

[0014] Vehicle charging system 100

[0015] First charging port 11

[0016] Second charging port 12

[0017] Boost charging circuit 20

[0018] Direct charging circuit 30

[0019] Voltage conversion module 21

[0020] Inverter 211

[0021] Motor 212

[0022] Upper tube T1~T3

[0023] Down tube T4~T6

[0024] First switch K1

[0025] Second switches K21, K22

[0026] The third switch K3

[0027] Fourth switches K41, K42

[0028] Capacitors C1, C2

[0029] Power battery 200

[0030] Vehicle 1

[0031] The following specific implementation methods will illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0033] In addition, the terms "first", "second", etc. in the specification of the present invention are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0034] It should be noted that, in the absence of conflict, the features in the embodiments of the present application may be combined with each other.

[0035] Please also read Figure 1-2 , Figure 1 is a schematic diagram of the topological structure of a vehicle charging system provided in an embodiment of the present application; Figure 2 This is a flow chart of a vehicle charging control method provided by an embodiment of the present application. The present application provides a vehicle charging control method, which is applied to Figure 1 A vehicle charging system 100 is shown.

[0036] like Figure 1 As shown, the vehicle charging system 100 includes two charging ports, a boost charging circuit 20 and a direct charging circuit 30. The first end of the boost charging circuit 20 and the first end of the direct charging circuit 30 are both electrically connected to the two charging ports at the same time, and the second end of the boost charging circuit 20 and the second end of the direct charging circuit 30 are both electrically connected to the power battery 200. In the present application, both charging ports are DC charging ports.

[0037] like Figure 2 As shown, the vehicle charging control method includes:

[0038] Step S1, after the first charging port 11 of the vehicle 1 is connected to the first charging pile, obtaining a first insulation detection voltage of the first charging port 11; and,

[0039] Step S2, based on the relationship between the first insulation detection voltage and the maximum allowable charging voltage of the vehicle 1, the boost charging circuit 20 is controlled to work and the charging voltage provided by the first charging pile is boosted and converted to charge the power battery 200, or the direct charging circuit 30 is controlled to work and the charging voltage provided by the first charging pile is received to directly charge the power battery 200.

[0040] Among them, the first charging port 11 is a charging port that first establishes a connection with the charging pile.

[0041] The vehicle charging control method provided in the present application, by setting a boost charging circuit 20 and a direct charging circuit 30, and selectively controlling the operation of the boost charging circuit 20 or the direct charging circuit 30 according to the first insulation detection voltage of the first charging port 11, can make any charging port in the vehicle charging system 100 compatible with high-voltage charging piles and low-voltage charging piles, with higher compatibility and wider applicability.

[0042] In the present application, the vehicle charging system 100 is a high-voltage system, for example, an 800V vehicle high-voltage system. The charging process of the vehicle charging system 100 includes four stages: charging handshake, parameter matching, charging stage, and charging completion. Specifically, the vehicle charging system 100 identifies the charging pile specifications in the charging handshake stage, and selectively controls the boost charging circuit 20 or the direct charging circuit 30 to work according to the charging pile specifications in the parameter matching stage. In the charging stage, the vehicle charging system 100 sends the required current and required voltage to the charging pile, triggering the charging pile to output the corresponding charging voltage and charging current through the boost charging circuit 20 or the direct charging circuit 30 to charge the power battery 200.

[0043] In some embodiments, the two charging ports include charging port A and charging port B, and the vehicle charging system 100 also includes a PDC (Power Domain Controller). The PDC is a core component in the vehicle charging system 100, and is used to control the charging circuit of the charging port A and communicate with the charging pile connected to the charging port A. In this application, the charging port A is taken as the first charging port 11 as an example. Specifically, the PDC is used to determine whether the first charging pile is a high-voltage charging pile or a low-voltage charging pile, and is used to control the on-off state of the first switch K1, the second switch K21, the second switch K22, and the third switch K3 described below according to the judgment result.

[0044] After the first charging port 11 of the vehicle 1 is connected to the first charging pile, obtaining a first insulation detection voltage of the first charging port 11 includes:

[0045] After the first charging port 11 of the vehicle 1 is connected to the first charging pile, the charging handshake phase is entered in response to a first charging start instruction input by the user; and,

[0046] In the charging handshake stage, the first insulation detection voltage output by the first charging pile is received through the first charging port 11, and the first insulation detection voltage of the first charging port 11 is obtained through the PDC.

[0047] In some embodiments, according to the magnitude relationship between the first insulation detection voltage and the maximum allowable charging voltage of the vehicle 1, the boost charging circuit 20 is controlled to work and the charging voltage provided by the first charging pile is boosted and converted to charge the power battery 200, or the direct charging circuit 30 is controlled to work and the charging voltage provided by the first charging pile is received to directly charge the power battery 200, including:

[0048] According to the magnitude relationship between the first insulation detection voltage and the maximum allowable charging voltage of the vehicle 1 and the duration for which the magnitude relationship is maintained, the boost charging circuit 20 is controlled to operate and the charging voltage provided by the first charging pile is boosted and converted to charge the power battery 200, or the direct charging circuit 30 is controlled to operate and the charging voltage provided by the first charging pile is received to directly charge the power battery 200.

[0049] Further, according to the magnitude relationship between the first insulation detection voltage and the maximum allowable charging voltage of the vehicle 1 and the duration of the magnitude relationship, the boost charging circuit 20 is controlled to work and the charging voltage provided by the first charging pile is boosted and converted to charge the power battery 200, or the direct charging circuit 30 is controlled to work and the charging voltage provided by the first charging pile is received to directly charge the power battery 200, including:

[0050] When the duration of the first insulation detection voltage being greater than or equal to the maximum allowable charging voltage is less than the first preset duration, the boost charging circuit 20 is controlled to operate and the charging voltage provided by the first charging pile is boosted and converted to charge the power battery 200; and,

[0051] When the duration during which the first insulation detection voltage is greater than or equal to the maximum allowable charging voltage is greater than or equal to the first preset duration, the direct charging circuit 30 is controlled to operate and receive the charging voltage provided by the first charging pile to directly charge the power battery 200.

[0052] It is not difficult to understand that since the vehicle charging system 100 is a high-voltage system, when the first insulation detection voltage is greater than or equal to the maximum allowable charging voltage and the duration is greater than or equal to the first preset duration, it indicates that the first charging pile is a high-voltage charging pile, and the power battery 200 can be charged through the direct charging circuit 30; otherwise, it indicates that the first charging pile is a low-voltage charging pile, and the voltage provided by the first charging pile needs to be boosted by the boost charging circuit 20 in order to charge the power battery 200.

[0053] Among them, the vehicle charging system 100 may also include a BMS (Battery Management System), and the maximum allowable charging voltage of the vehicle 1 may be the maximum allowable total charging voltage of the BMS (for example, 750V). For example, the first preset duration may be 200ms. Of course, in other embodiments, the PDC may not consider the duration of the first insulation detection voltage being greater than or equal to the maximum allowable charging voltage when judging the voltage level of the first charging pile, that is, when the first insulation detection voltage is greater than or equal to the maximum allowable charging voltage, the boost charging circuit 20 is controlled to work and the charging voltage provided by the first charging pile is boosted and converted to charge the power battery 200; when the first insulation detection voltage is less than the maximum allowable charging voltage, the boost charging circuit 20 is controlled to work and the charging voltage provided by the first charging pile is boosted and converted to charge the power battery 200.

[0054] like Figure 1 As shown, in some embodiments, the boost charging circuit 20 includes a voltage conversion module 21 and a first switch K1, the first end of the voltage conversion module 21 is the second end of the boost charging circuit 20, the second end of the voltage conversion module 21 is electrically connected to the first end of the first switch K1, and the second end of the first switch K1 is the first end of the boost charging circuit 20.

[0055] The voltage conversion module 21 includes a motor 212 and an inverter 211. The inverter 211 includes an AC terminal and a DC terminal. The DC terminal is a first terminal of the voltage conversion module 21. The AC terminal is electrically connected to the motor 212. The neutral point of the motor 212 is a second terminal of the voltage conversion module 21. When the motor 212 is used as a drive motor, the inverter 211 can convert the DC power provided by the power battery 200 into AC power to drive the motor 212 to work.

[0056] For example, Figure 1 As shown, the inverter 211 includes three bridge arms, namely, a first bridge arm, a second bridge arm and a third bridge arm, wherein the first bridge arm includes an upper tube T1 and a lower tube T4, the second bridge arm includes an upper tube T2 and a lower tube T5, and the third bridge arm includes an upper tube T3 and a lower tube T6, and the motor 212 includes an A-phase winding WA, a B-phase winding WB and a C-phase winding WC.

[0057] Among them, the first connection end of the upper tube T1, the first connection end of the upper tube T2 and the first connection end of the upper tube T3 are connected together to form a first bus terminal, the second connection end of the upper tube T1 and the first connection end of the lower tube T4 are electrically connected to form the midpoint of the first bridge arm, the second connection end of the upper tube T2 and the first connection end of the lower tube T5 are electrically connected to form the midpoint of the second bridge arm, the second connection end of the upper tube T3 and the first connection end of the lower tube T6 are electrically connected to form the midpoint of the third bridge arm, the second connection end of the lower tube T4, the second connection end of the lower tube T5 and the second connection end of the lower tube T6 are connected together to form a second bus terminal, the first bus terminal and the second bus terminal constitute a DC terminal, and the midpoint of the first bridge arm, the midpoint of the second bridge arm and the midpoint of the third bridge arm constitute an AC terminal. One end of the A-phase winding WA is electrically connected to the midpoint of the first bridge arm, one end of the B-phase winding WB is electrically connected to the midpoint of the second bridge arm, one end of the C-phase winding WC is electrically connected to the midpoint of the second bridge arm, and the other end of the A-phase winding WA, the other end of the B-phase winding WB, and the other end of the C-phase winding WC are connected together to form a neutral point of the motor 212.

[0058] During charging, at least one phase winding of the motor 212 and at least one corresponding bridge arm in the inverter 211 can form a buck-boost circuit to charge the power battery 200 after performing a boost conversion on the charging voltage provided by the charging pile.

[0059] In this way, the motor 212 and the inverter 211 can be reused, which can effectively reduce the design cost.

[0060] Specifically, the three-phase winding in the motor 212 and the three-phase bridge arm in the inverter 211 are described as buck-boost circuits as an example, and the motor windings are charged and discharged by controlling the conduction and closing of each switch tube in the three-phase bridge arm, so as to achieve the buck-boost effect. More specifically, the first pulse signal can be used to control the on-off state of the upper tube T1 to the upper tube T3, and the second pulse signal can be used to control the on-off state of the lower tube T4 to the lower tube T6, wherein the first pulse signal and the second pulse signal are inverted, that is, when the first pulse signal is at a high level, the second pulse signal is at a low level, and when the first pulse signal is at a low level, the second pulse signal is at a high level.

[0061] During operation, in a pulse cycle, when the lower tubes T4 to T6 are all turned on, the first charging pile can charge the three-phase winding of the motor 212, and when the upper tubes T1 to T3 are all turned on, the first charging pile and the three-phase winding of the motor 212 can charge the power battery 200 at the same time, so that the power battery 200 can be boosted and charged.

[0062] Furthermore, the boost charging circuit 20 further includes a capacitor C1 and a capacitor C2, wherein the capacitor C1 is electrically connected between the second end of the first switch K2 and the ground, and is used to maintain a stable voltage at the first charging port 11 and / or the second charging port 12. The capacitor C2 is electrically connected to the DC end of the inverter 211, and is used to maintain a stable voltage at the DC end of the inverter 211.

[0063] Controlling the boost charging circuit 20 to work and charging the power battery 200 after boosting the charging voltage provided by the first charging pile includes:

[0064] Controlling the first switch K1 to be turned on; and,

[0065] The control voltage conversion module 21 performs a voltage boost conversion on the charging voltage provided by the first charging pile to charge the power battery 200 .

[0066] In some embodiments, the vehicle charging system 100 further includes a second switch, which is used to connect or disconnect the electrical connection between the first charging port 11 and the boost charging circuit 20, and the electrical connection between the first charging port 11 and the direct charging circuit 30. For example, Figure 1 As shown, the number of second switches is 2, including a second switch K21 and a second switch K22, a first end of the second switch K21 is electrically connected to both the boost charging circuit 20 and the direct charging circuit 30, and a second end of the second switch K21 is electrically connected to the positive electrode connection end of the first charging port 11. A first end of the second switch K22 is grounded, and a second end of the second switch K22 is electrically connected to the negative electrode connection end of the first charging port 11.

[0067] Before the voltage conversion module 21 is controlled to step up the charging voltage provided by the first charging pile and then charges the power battery 200, the vehicle charging control method further includes:

[0068] Control the voltage conversion module 21 to convert the battery voltage provided by the power battery 200, so that the voltage at the second end of the voltage conversion module 21 changes to a first voltage reduction target value; and,

[0069] When the voltage at the second end of the voltage conversion module 21 is at the first voltage reduction target value, the second switch is controlled to be turned on.

[0070] The first voltage reduction target value is the minimum value between the first preset voltage difference value and the preset low voltage reference value, and the first preset voltage difference value is the difference between a preset multiple of the current bus voltage value of the power battery 200 and the first voltage value.

[0071] In some embodiments, the vehicle charging system 100 further includes a VTOG (Charging and Discharging Electric Machine Controller), which is used to output a pulse signal to the inverter 211 to control the working state of the inverter 211. In the parameter matching stage, the PDC outputs the first voltage reduction target value to the VTOG through the CAN (Controller Area Network) bus, and the VTOG generates a corresponding pulse signal according to the first voltage reduction target value to control the inverter 211 to adjust the voltage. When the VTOG determines that the voltage value at the second end of the voltage conversion module 21 reaches the first voltage reduction target value, it feeds back a "voltage reduction completion" signal to the PDC, triggering the PDC to control the second switch to turn on.

[0072] Exemplarily, the preset multiple is 0.95, the first voltage value is 10V, and the preset low voltage reference value is 420V, then the first voltage reduction target value = min{0.95Ubat-10V, 420V}, where Ubat is the current bus voltage value of the power battery 200, and min is the minimum value operator.

[0073] It should be noted that only the first insulation detection voltage can be used to determine whether the first charging pile is a low-voltage pile, and the actual maximum output voltage of the first charging pile can be sent out through the message later. Therefore, the first voltage reduction target value should be set to a value with general applicability, that is, the first voltage reduction target value = min{0.95Ubat-10V, 420V}. When it is determined that the first charging pile is a low-voltage charging pile, before the second switch is controlled to be turned on, the battery voltage provided by the power battery 200 is stepped down to the first voltage reduction target value through the voltage conversion module 21, so that the voltage of the capacitor C1 is maintained at the first voltage reduction target value. In this way, it can be achieved that when the second switch is controlled to be turned on, the voltage at the first end of the boost charging circuit 20 matches the charging voltage output by the first charging pile, and the voltage at the first end of the boost charging circuit 20 can be prevented from exceeding the maximum output voltage output by the first charging pile, causing the first charging pile to report an error and stop charging.

[0074] In some embodiments, controlling the voltage conversion module 21 to perform a voltage boost conversion on the charging voltage provided by the first charging pile to charge the power battery 200 includes:

[0075] The voltage conversion module 21 is controlled to perform voltage conversion on the battery voltage provided by the power battery 200 , so that the voltage at the second end of the voltage conversion module 21 increases from the first voltage reduction target value to the voltage reduction limit value.

[0076] It should be noted that, in the process of charging the power battery through the boost charging circuit 20 of the first charging pile, since the current voltage of the power battery 200 will gradually increase, therefore, in the present application, the PDC outputs a voltage reduction target value that gradually increases at a preset rate to the VTOG, so that the VTOG controls the on-off state of the switch tube in the inverter 211, so that the voltage at the second end of the voltage conversion module 21 increases from the first voltage reduction target value to the voltage reduction limit value, which can increase the charging power output by the charging pile and improve the charging efficiency. Exemplarily, the preset rate can be an increase of 2V every 1 second.

[0077] It should be noted that since the power supply capacity of the first charging pile is limited, when the power supply capacity of the first charging pile reaches the maximum capacity, the voltage at the second end of the voltage conversion module 21 reaches the voltage reduction limit value. At this time, the second end of the voltage conversion module 21 can be controlled to be fixed at the voltage reduction limit value to continue to charge the power battery 200 at a constant voltage.

[0078] In some embodiments, the vehicle charging control method further includes:

[0079] In the process of charging the power battery 200 by the first charging pile only through the boost charging circuit 20, the first limit value is determined as the step-down limit value; wherein the first limit value is the minimum value of the first preset voltage difference value and the second preset voltage difference value, and the second preset voltage difference value is the difference between the highest output voltage of the first charging pile and the third voltage value; and,

[0080] In the process of the first charging pile and the second charging pile jointly charging the power battery through the boost charging circuit, the second limit value is determined as the step-down limit value; wherein the second limit value is the minimum value between the first preset voltage difference and the third preset voltage difference, and the third preset voltage difference is the difference between the minimum value between the highest output voltage of the first charging pile and the highest output voltage of the second charging pile and the third voltage value.

[0081] Exemplarily, the third voltage value is 30V, then the first limit value = min{0.95Ubat-10V, Umax1-30V}, the second limit value = min{0.95Ubat-10V, Ucml-30V}, wherein Ucml = min{Umax1, Umax2}, Umax1 is the maximum output voltage of the first charging pile, and Umax2 is the maximum output voltage of the second charging pile.

[0082] In this way, it is possible to avoid mutual interference between the first charging pile and the second charging pile due to different charging capabilities.

[0083] like Figure 1As shown, in some embodiments, the direct charging circuit 30 includes a third switch K3, and the first end and the second end of the third switch K3 are respectively the first end and the second end of the direct charging circuit 30. Figure 1 As shown, the first end of the third switch K3 is electrically connected to the second end of the first switch K1, and is electrically connected to the positive electrode connection end of the first charging port 11 through the second switch K21, and is electrically connected to the positive electrode connection end of the second charging port 12 through the fourth switch K41, and the second end of the third switch K3 is electrically connected to the positive electrode of the power battery 200.

[0084] Controlling the direct charging circuit 30 to work and receive the charging voltage provided by the first charging pile to directly charge the power battery 200 includes:

[0085] Controlling the third switch K3 to be turned on; and,

[0086] The second switch is controlled to be turned on to receive the charging voltage provided by the first charging pile to directly charge the power battery 200 .

[0087] Furthermore, in some embodiments, before controlling the third switch K3 to be turned on, the vehicle charging control method further includes:

[0088] When the duration that the first insulation detection voltage is greater than or equal to the maximum allowable charging voltage is greater than or equal to the first preset duration, the first switch K1 is controlled to be turned on;

[0089] Control the voltage conversion module 21 to convert the battery voltage provided by the power battery 200, so that the voltage at the second end of the voltage conversion module 21 changes to a second voltage reduction target value; wherein the second voltage reduction target value is the minimum value of a preset voltage sum value and a voltage value of a maximum allowable charging voltage of the vehicle 1, and the preset voltage sum value is the sum of the current bus voltage value of the power battery 200 and the second voltage value; and,

[0090] When it is determined that the voltage conversion module 21 is in the fully-on state, the first switch K1 is controlled to be turned off.

[0091] Exemplarily, the second voltage value is 20V, and the second voltage reduction target value=min{Ubat+20V, Ubhm}, wherein Ubhm is the voltage value of the highest allowable charging voltage of the vehicle 1 .

[0092] Specifically, in the parameter matching stage, the PDC outputs the second voltage reduction target value to the VTOG through the CAN bus, and the VTOG generates a corresponding pulse signal according to the second voltage reduction target value to control the inverter 211 to adjust the voltage. When the VTOG determines that the voltage value of the second end of the voltage conversion module 21 reaches the second voltage reduction target value, it feeds back a "full-on state" signal to the PDC, and the PDC then controls the first switch K1 to be disconnected, and requests the VTOG to stop voltage regulation, and controls the third switch K3 to be turned on. Among them, when the voltage conversion module 21 is in the fully-on state, it means that the voltage conversion module 21 continuously conducts the electrical connection between the positive electrode of the power battery 200 and the first switch K1, and continuously disconnects the electrical connection between the negative electrode of the power battery 200 and the first switch K1. Specifically, Figure 1 As shown, the fully open state means that the lower tubes T4 to T6 in the inverter 211 are all kept in the disconnected state, and at least one of the upper tubes T1 to T3 is kept in the on state.

[0093] In this way, no matter whether the second charging pile is a high-voltage charging pile or a low-voltage charging pile, the PDC is first allowed to output the corresponding voltage reduction target value to the VTOG, so that the VTOG controls the voltage conversion module 21 to adjust the voltage, and the control process is more unified.

[0094] In some embodiments, after controlling the second switch to be turned on, the vehicle charging control method further includes:

[0095] The first required current value is sent to the first charging pile, so that the first charging pile outputs a corresponding charging current to the first charging port based on the first required current value.

[0096] The first required current value is determined based on at least one of a current charging parameter of the power battery 200 and a current first temperature value of the first charging port 11 .

[0097] Exemplarily, the current charging parameter of the power battery 200 includes at least one of a current battery voltage, a current SOC (State Of Charge) and a current battery temperature value.

[0098] In this way, the charging current of the first charging pile can be allocated according to at least one of the current charging parameter of the power battery 200 and the current first temperature value, so that the charging efficiency and safety are higher.

[0099] Furthermore, the first required current value is determined based on the current first target current value and the first temperature coefficient, wherein the current first target current value is determined based on the current charging parameters of the power battery 200; and the first temperature coefficient is a temperature coefficient corresponding to the current first temperature value.

[0100] Exemplarily, the first required current value is the product of the current first target current value and the first temperature coefficient.

[0101] Specifically, the BMS can determine the first charging current currently required by the power battery 200 according to the current charging parameters of the power battery 200, and the PDC then determines the minimum value of the first charging current currently required by the power battery 200 determined by the BMS and the maximum charging current allowed by the VTOG as the current first target current value.

[0102] Exemplarily, the vehicle charging system 100 may store a one-to-one correspondence between multiple temperature values ​​and multiple temperature coefficients. In the one-to-one correspondence, the higher the temperature value, the lower the corresponding temperature coefficient. The PDC may determine the first temperature coefficient corresponding to the current first temperature value based on the one-to-one correspondence.

[0103] In this way, different first temperature coefficients can be obtained according to different first temperature values, which can prevent the temperature value of the first charging port 11 from being too high during the charging process, thereby improving safety.

[0104] In some embodiments, after controlling the second switch to be turned on, the vehicle charging control method further includes:

[0105] The first required voltage value is sent to the first charging pile, so that the first charging pile outputs a corresponding charging voltage to the first charging port 11 based on the first required voltage value.

[0106] The first required voltage value is determined based on the maximum allowable charging voltage of the vehicle 1 and the maximum output voltage of the first charging pile. Exemplarily, the first required voltage value is the minimum value between the maximum allowable charging voltage of the vehicle 1 and the maximum output voltage of the first charging pile.

[0107] In some embodiments, the vehicle charging control method further includes:

[0108] After the second charging port 12 of the vehicle 1 is connected to the second charging pile, a second insulation detection voltage of the second charging port 12 is obtained; wherein the second charging port 12 is the charging port that is connected to the charging pile later; and,

[0109] According to the magnitude relationship between the second insulation detection voltage and the maximum allowable charging voltage of the vehicle 1 and at least one of the charging methods of the first charging pile, the second charging pile is controlled to charge the power battery 200 in the same charging method as the first charging pile.

[0110] The charging methods include a boost charging method for charging the power battery 200 through a boost charging circuit 20 and a direct charging method for charging the power battery 200 through a direct charging circuit 30 .

[0111] In this way, the vehicle charging system 100 can support two low-voltage charging piles to charge the power battery 200 at the same time, can support two high-voltage charging piles to charge the power battery 200 at the same time, and can also support one high-voltage charging pile and one low-voltage charging pile to charge the power battery 200 at the same time, with higher compatibility and wider applicability.

[0112] Specifically, in some embodiments, the vehicle charging system 100 also includes a CCM (Charge Control Module), which is used to control the charging circuit of the charging port B and communicate with the charging pile connected to the charging port B. The present application takes the charging port B as the second charging port 12 as an example. Specifically, the CCM is used to determine whether the second charging pile is a high-voltage charging pile or a low-voltage charging pile, and is used to control the on-off state of the fourth switch K41 and the fourth switch K42 described below according to the judgment result.

[0113] After the second charging port 12 of the vehicle 1 is connected to the second charging pile, obtaining a second insulation detection voltage of the second charging port 12 includes:

[0114] After the second charging port 12 of the vehicle 1 is connected to the second charging pile, the charging handshake phase is entered in response to a second charging start instruction input by the user; and,

[0115] In the charging handshake phase, the second insulation detection voltage output by the second charging pile is received through the second charging port 12, and the second insulation detection voltage of the second charging port 12 is obtained through the CCM.

[0116] In some embodiments, according to at least one of the magnitude relationship between the second insulation detection voltage and the maximum allowable charging voltage of the vehicle 1 and the charging mode of the first charging pile, controlling the second charging pile to charge the power battery 200 in the same charging mode as the first charging pile includes:

[0117] When the charging mode of the first charging pile is the boost charging mode, the second charging pile is controlled to charge the power battery 200 through the boost charging circuit 20;

[0118] When the charging mode of the first charging pile is direct charging mode, according to the magnitude relationship between the second insulation detection voltage and the maximum allowable charging voltage of the vehicle 1 and the duration of the magnitude relationship, the second charging pile and the first charging pile are controlled to charge the power battery 200 together through the boost charging circuit 20 or to charge the power battery 200 together through the direct charging circuit 30.

[0119] Further, when the charging mode of the first charging pile is the direct charging mode, according to the magnitude relationship between the second insulation detection voltage and the maximum allowable charging voltage of the vehicle 1 and the duration of the magnitude relationship, the second charging pile and the first charging pile are controlled to charge the power battery 200 together through the boost charging circuit 20 or to charge the power battery 200 together through the direct charging circuit 30, including:

[0120] When the charging mode of the first charging pile is the direct charging mode, and the duration of the second insulation detection voltage being greater than or equal to the maximum allowable charging voltage is greater than or equal to the second preset duration, the second charging pile is controlled to charge the power battery 200 through the direct charging circuit 30; and,

[0121] When the charging mode of the first charging pile is direct charging mode, and the duration that the second insulation detection voltage is greater than or equal to the maximum allowable charging voltage is less than the second preset duration, the first charging pile is controlled to switch to charging the power battery 200 through the boost charging circuit 20, and the second charging pile is controlled to charge the power battery 200 through the boost charging circuit 20.

[0122] Exemplarily, the second preset duration is 200 ms.

[0123] It is not difficult to understand that when the second insulation detection voltage is greater than or equal to the maximum allowable charging voltage for a duration greater than or equal to the second preset duration, it indicates that the second charging pile is a high-voltage charging pile. At this time, regardless of whether the charging method of the first charging pile is a direct charging method or a boost charging method, the second charging pile can charge the power battery 200 in the same charging method as the first charging pile. When the second insulation detection voltage is greater than or equal to the maximum allowable charging voltage for a duration less than the second preset duration, it indicates that the second charging pile is a low-voltage charging pile. At this time, if the charging method of the first charging pile is a direct charging method, the second charging pile cannot directly charge the power battery 200 through the direct charging circuit 30, so it is necessary to control the first charging pile to switch to charging the power battery 200 through the boost charging circuit 20, and then control the second charging pile to charge the power battery 200 through the boost charging circuit 20; if the charging method of the first charging pile is a boost charging method, the second charging pile can directly charge the power battery 200 through the boost charging circuit 20.

[0124] In other implementations, the CCM may not consider the duration during which the second insulation detection voltage is greater than or equal to the maximum allowable charging voltage when determining the voltage level of the second charging pile.

[0125] In some embodiments, the vehicle charging system 100 further includes a fourth switch, which is used to connect or disconnect the electrical connection between the second charging port 12 and the boost charging circuit 20, and the electrical connection between the second charging port 12 and the direct charging circuit 30. For example, Figure 1 As shown, the number of the fourth switches is 2, including a fourth switch K41 and a fourth switch K42, a first end of the fourth switch K41 is electrically connected to both the boost charging circuit 20 and the direct charging circuit 30, and a second end of the fourth switch K41 is electrically connected to the positive electrode connection end of the second charging port 12. A first end of the fourth switch K42 is grounded, and a second end of the fourth switch K42 is electrically connected to the negative electrode connection end of the second charging port 12.

[0126] Further, controlling the second charging pile to charge the power battery 200 through the boost charging circuit 20 includes:

[0127] When the second charging port 12 meets the charging condition, the fourth switch is controlled to be turned on, so that the second charging pile charges the power battery 200 through the boost charging circuit 20 .

[0128] Controlling the second charging pile to charge the power battery 200 through the direct charging circuit 30 includes:

[0129] When the second charging port 12 meets the charging condition, the fourth switch is controlled to be turned on, so that the second charging pile charges the power battery 200 through the direct charging circuit 30 .

[0130] Controlling the first charging pile to switch to charging the power battery 200 through the boost charging circuit 20, and enabling the second charging pile to charge the power battery 200 through the boost charging circuit 20, including:

[0131] Controlling the first switch K1 to be turned on;

[0132] Control the third switch K3 to be turned off, so that the first charging pile switches to charging the power battery 200 through the boost charging circuit 20;

[0133] Control the voltage conversion module 21 to convert the battery voltage provided by the power battery 200, so that the voltage at the second end of the voltage conversion module 21 changes to a first voltage reduction target value; and,

[0134] When the second charging port 12 meets the charging condition, the fourth switch is controlled to be turned on, so that the second charging pile charges the power battery 200 through the boost charging circuit 20 .

[0135] The charging condition is that after the second charging pile stops outputting the second insulation detection voltage, the voltage of the second charging port 12 is lower than the preset pressure relief threshold, and the charging message interaction is normal. For example, the preset pressure relief threshold is 60V, so that the second charging pile can fully discharge the residual charge before the fourth switch is controlled to be turned on, thereby avoiding arcing when the fourth switch is turned on, which is safer.

[0136] It should be noted that, as mentioned above, during the process of the first charging pile charging the power battery 200, the PDC will output a voltage reduction target value that gradually increases at a preset rate to the VTOG, so that the voltage at the second end of the voltage conversion module 21 increases from the first voltage reduction target value to the voltage reduction limit value. At this time, if the second charging port 12 performs parameter matching during the voltage conversion module 21 boosting process, the second charging pile may detect that the voltage deviation rate of the second charging port 12 is greater than 5% and stop charging.

[0137] In view of this, in order to improve the stability of the second charging pile, in some embodiments, the vehicle charging control method further includes:

[0138] In the process of controlling the voltage conversion module 21 to perform voltage conversion on the battery voltage provided by the power battery 200 so that the voltage at the second end of the voltage conversion module 21 increases from the first voltage reduction target value to the voltage reduction limit value, if it is detected that the second charging pile and the second charging port 12 start to establish a connection, the voltage conversion module 21 is controlled to perform voltage conversion on the battery voltage provided by the power battery 200 so that the voltage at the second end of the voltage conversion module 21 remains at the current voltage; and,

[0139] When it is determined that the second charging pile is connected, the voltage conversion module 21 is controlled to convert the battery voltage provided by the power battery 200 so that the voltage at the second end of the voltage conversion module 21 continues to increase from the current voltage to the voltage reduction limit value.

[0140] The second charging pile is connected, which means that the charging circuit between the second charging pile and the power battery 200 is established. Specifically, Figure 1 As shown, after the fourth switch is turned on, it indicates that the second charging pile is connected.

[0141] In some embodiments, after controlling the fourth switch to be turned on, the vehicle charging control method further includes:

[0142] The second required current value is sent to the second charging pile, so that the second charging pile outputs a corresponding charging current to the second charging port based on the second required current value.

[0143] The second required current value is determined based on at least one of a current charging parameter of the power battery 200 and a current second temperature value of the second charging port 12 .

[0144] In this way, the charging current of the second charging pile can be allocated according to at least one of the current charging parameter of the power battery 200 and the current second temperature value, so that the charging efficiency and safety are higher.

[0145] Furthermore, the required current value is determined based on the current second target current value and the second temperature coefficient, wherein the current second target current value is determined based on the current charging parameters of the power battery 200; and the second temperature coefficient is a temperature coefficient corresponding to the current second temperature value.

[0146] Exemplarily, the second required current value is the product of the current second target current value and the second temperature coefficient.

[0147] Specifically, the BMS can determine the first charging current allocated to the first charging pile and the second charging current allocated to the second charging pile according to the current charging parameters of the power battery 200, and the CCM then determines the second charging current determined by the BMS as the current second target current value.

[0148] For example, the vehicle charging system 100 may store a one-to-one correspondence between multiple temperature values ​​and multiple temperature coefficients, and the CCM may determine the second temperature coefficient corresponding to the current second temperature value according to the one-to-one correspondence.

[0149] In some embodiments, after controlling the second switch K2 to be turned on, the vehicle charging control method further includes:

[0150] The second required voltage value is sent to the second charging pile, so that the second charging pile outputs a corresponding charging voltage to the second charging port based on the second required voltage value.

[0151] The second required voltage value is determined based on the maximum allowable charging voltage of the vehicle 1 and the maximum output voltage of the second charging pile. For example, the second required voltage value is the minimum value between the maximum allowable charging voltage of the vehicle 1 and the maximum output voltage of the second charging pile.

[0152] Please refer again Figure 1 Based on the same inventive concept, the present application also provides a vehicle charging system 100, which includes two charging ports, a boost charging circuit 20, a direct charging circuit 30 and a control module (not shown in the figure). The first end of the boost charging circuit 20 and the first end of the direct charging circuit 30 are electrically connected to the two charging ports respectively, and the second end of the boost charging circuit 20 and the second end of the direct charging circuit 30 are suitable for being electrically connected to the power battery 200. The control module is electrically connected to the two charging ports, the boost charging circuit 20 and the direct charging circuit 30, and is used to control the execution of the steps in the vehicle charging control method of any of the above embodiments.

[0153] Among them, the control module may include the PDC, VTOG, BMS and CCM mentioned above. The control module may execute corresponding steps through at least one of the PDC, VTOG, BMS and CCM. Please refer to the above text for detailed introduction, which will not be repeated here.

[0154] Please refer again Figure 1 Based on the same inventive concept, the present application also provides a vehicle 1, which includes a power battery 200 and the vehicle charging system 100 of the above embodiment.

[0155] The vehicle charging system 100 and the vehicle 1 provided in the present application, by setting a boost charging circuit 20 and a direct charging circuit 30, and selectively controlling the operation of the boost charging circuit 20 or the direct charging circuit 30 according to the first insulation detection voltage of the first charging port 11, can make any charging port in the vehicle charging system 100 compatible with high-voltage charging piles and low-voltage charging piles, with higher compatibility and wider applicability.

[0156] Based on the same inventive concept, the present application also provides a computer-readable storage medium, in which a computer program is stored. The computer program is used for being called and executed by a processor to implement the steps of the vehicle charging control method of any of the above embodiments.

[0157] The computer storage medium of the embodiment of the present application can adopt any combination of one or more computer-readable media. Computer-readable media can be computer-readable signal media or computer-readable storage media. Computer-readable storage media can be, for example, but not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or devices, or any combination of the above. More specific examples (non-exhaustive lists) of computer-readable storage media include: electrical connections with one or more wires, portable computer disks, hard disks, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memory), optical fibers, portable compact disk read-only memories (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the above. In this document, computer-readable storage media can be any tangible medium containing or storing programs, which can be used by instruction execution systems, devices or devices or used in combination with them.

[0158] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, which carry computer-readable program code. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Computer-readable signal media may also be any computer-readable medium other than a computer-readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0159] The program code embodied on the computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

[0160] Computer program code for performing the operations of the present invention may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as C or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., through the Internet using an Internet service provider).

[0161] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

[0162] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A vehicle charging control method, characterized in that: The vehicle charging control method comprises: After a first charging port of a vehicle is connected to a first charging pile, obtaining a first insulation detection voltage of the first charging port; and According to the relationship between the first insulation detection voltage and the maximum allowable charging voltage of the vehicle, the boost charging circuit is controlled to charge the power battery after boosting the charging voltage provided by the first charging pile, or the direct charging circuit is controlled to charge the power battery directly after receiving the charging voltage provided by the first charging pile.

2. The vehicle charging control method according to claim 1, characterized in that: According to the magnitude relationship between the first insulation detection voltage and the maximum allowable charging voltage of the vehicle, controlling the boost charging circuit to operate and charging the power battery after performing a boost conversion on the charging voltage provided by the first charging pile, or controlling the direct charging circuit to operate and receiving the charging voltage provided by the first charging pile to directly charge the power battery, comprises: According to the magnitude relationship between the first insulation detection voltage and the maximum allowable charging voltage of the vehicle and the duration for which the magnitude relationship is maintained, the boost charging circuit is controlled to charge the power battery after performing a boost conversion on the charging voltage provided by the first charging pile, or the direct charging circuit is controlled to charge the power battery directly after receiving the charging voltage provided by the first charging pile.

3. The vehicle charging control method according to claim 2, characterized in that: According to the magnitude relationship between the first insulation detection voltage and the maximum allowable charging voltage of the vehicle and the duration of the magnitude relationship, controlling the boost charging circuit to operate and charging the power battery after performing a boost conversion on the charging voltage provided by the first charging pile, or controlling the direct charging circuit to operate and receiving the charging voltage provided by the first charging pile to directly charge the power battery, comprises: When the first insulation detection voltage is greater than or equal to the maximum allowable charging voltage for a duration less than a first preset duration, controlling the boost charging circuit to operate and charging the power battery after boosting the charging voltage provided by the first charging pile; and When the first insulation detection voltage is greater than or equal to the maximum allowable charging voltage for a duration greater than or equal to a first preset duration, the direct charging circuit is controlled to operate and receive the charging voltage provided by the first charging pile to directly charge the power battery.

4. The vehicle charging control method according to claim 1, characterized in that: The vehicle charging control method further includes: After the second charging port of the vehicle is connected to the second charging pile, obtaining a second insulation detection voltage of the second charging port; and According to the magnitude relationship between the second insulation detection voltage and the maximum allowable charging voltage of the vehicle and at least one of the charging methods of the first charging pile, the second charging pile is controlled to charge the power battery in the same charging method as the first charging pile; wherein the charging methods include a boost charging method for charging the power battery through the boost charging circuit and a direct charging method for charging the power battery through the direct charging circuit.

5. The vehicle charging control method according to claim 4, characterized in that: The controlling the second charging pile to charge the power battery in the same charging mode as the first charging pile according to at least one of the magnitude relationship between the second insulation detection voltage and the maximum allowable charging voltage of the vehicle and the charging mode of the first charging pile includes: When the charging mode of the first charging pile is a boost charging mode, controlling the second charging pile to charge the power battery through the boost charging circuit; When the charging mode of the first charging pile is direct charging mode, according to the magnitude relationship between the second insulation detection voltage and the maximum allowable charging voltage of the vehicle and the duration of the magnitude relationship being maintained, the second charging pile and the first charging pile are controlled to charge the power battery jointly through the boost charging circuit or to charge the power battery jointly through the direct charging circuit.

6. The vehicle charging control method according to claim 5, characterized in that: When the charging mode of the first charging pile is the direct charging mode, according to the magnitude relationship between the second insulation detection voltage and the maximum allowable charging voltage of the vehicle and the duration of the magnitude relationship being maintained, controlling the second charging pile and the first charging pile to charge the power battery together through the boost charging circuit or to charge the power battery together through the direct charging circuit, including: When the charging mode of the first charging pile is a direct charging mode, and the duration for which the second insulation detection voltage is greater than or equal to the maximum allowable charging voltage is greater than or equal to a second preset duration, controlling the second charging pile to charge the power battery through the direct charging circuit; and When the charging mode of the first charging pile is direct charging mode, and the duration that the second insulation detection voltage is greater than or equal to the maximum allowable charging voltage is less than a second preset duration, the first charging pile is controlled to switch to charging the power battery through the boost charging circuit, and the second charging pile is controlled to charge the power battery through the boost charging circuit.

7. The vehicle charging control method according to claim 6, characterized in that: The step of controlling the boost charging circuit to operate and charging the power battery after performing a boost conversion on the charging voltage provided by the first charging pile comprises: Controlling the first switch to be turned on; and The control voltage conversion module performs a step-up conversion on the charging voltage provided by the first charging pile to charge the power battery; Wherein, the boost charging circuit includes a voltage conversion module and a first switch, the first end of the voltage conversion module is the second end of the boost charging circuit, the second end of the voltage conversion module is electrically connected to the first end of the first switch, and the second end of the first switch is the first end of the boost charging circuit.

8. The vehicle charging control method according to claim 7, characterized in that: Before the control voltage conversion module performs voltage boost conversion on the charging voltage provided by the first charging pile to charge the power battery, the vehicle charging control method further includes: controlling the voltage conversion module to perform voltage conversion on the battery voltage provided by the power battery, so that the voltage at the second end of the voltage conversion module changes to a first voltage reduction target value; and When the voltage at the second end of the voltage conversion module is the first voltage reduction target value, controlling the second switch to be turned on; The vehicle charging system further includes a second switch, which is used to connect or disconnect the electrical connection between the first charging port and the boost charging circuit, and the electrical connection between the first charging port and the direct charging circuit.

9. The vehicle charging control method according to claim 8, characterized in that: The first voltage reduction target value is the minimum value between a first preset voltage difference value and a preset low voltage reference value, and the first preset voltage difference value is the difference between a preset multiple of a current bus voltage value of the power battery and the first voltage value.

10. The vehicle charging control method according to claim 9, characterized in that: The control voltage conversion module performs a step-up conversion on the charging voltage provided by the first charging pile to charge the power battery, including: The voltage conversion module is controlled to perform voltage conversion on the battery voltage provided by the power battery, so that the voltage at the second end of the voltage conversion module increases from the first voltage reduction target value to a voltage reduction limit value.

11. The vehicle charging control method according to claim 10, characterized in that: The controlling the direct charging circuit to work and receive the charging voltage provided by the first charging pile to directly charge the power battery includes: controlling the third switch to be turned on; and Controlling the second switch to be turned on to receive the charging voltage provided by the first charging pile to directly charge the power battery; The direct charging circuit comprises a third switch, and a first end and a second end of the third switch are respectively a first end and a second end of the direct charging circuit.

12. The vehicle charging control method according to claim 11, characterized in that: Before controlling the third switch to be turned on, the vehicle charging control method further includes: When the first insulation detection voltage is greater than or equal to the maximum allowable charging voltage for a duration greater than or equal to a first preset duration, controlling the first switch to be turned on; controlling the voltage conversion module to perform voltage conversion on the battery voltage provided by the power battery, so that the voltage at the second end of the voltage conversion module changes to a second voltage reduction target value; and When it is determined that the voltage conversion module is in the fully-on state, the first switch is controlled to be turned off.

13. The vehicle charging control method according to claim 12, characterized in that: The second voltage reduction target value is a minimum value between a preset voltage sum value and a voltage value of a maximum allowable charging voltage of the vehicle, and the preset voltage sum value is the sum of a current bus voltage value of the power battery and a second voltage value.

14. The vehicle charging control method according to claim 11, characterized in that: The control enables the second charging pile to charge the power battery through the boost charging circuit, including: When the second charging port meets the charging condition, controlling the fourth switch to be turned on, so that the second charging pile charges the power battery through the boost charging circuit; The vehicle charging system further includes a fourth switch, and the fourth switch is used to connect or disconnect the electrical connection between the second charging port and the boost charging circuit, and the electrical connection between the second charging port and the direct charging circuit.

15. The vehicle charging control method according to claim 14, characterized in that: The controlling so that the second charging pile charges the power battery through the direct charging circuit includes: When the second charging port meets the charging condition, the fourth switch is controlled to be turned on, so that the second charging pile charges the power battery through the direct charging circuit.

16. The vehicle charging control method according to claim 14, characterized in that: The control enables the first charging pile to switch to charging the power battery through the boost charging circuit, and enables the second charging pile to charge the power battery through the boost charging circuit, including: Controlling the first switch to be turned on; Controlling the third switch to be turned off so that the first charging pile switches to charging the power battery through the boost charging circuit; controlling the voltage conversion module to perform voltage conversion on the battery voltage provided by the power battery, so that the voltage at the second end of the voltage conversion module changes to the first voltage reduction target value; and When the second charging port meets the charging condition, the fourth switch is controlled to be turned on, so that the second charging pile charges the power battery through the boost charging circuit.

17. The vehicle charging control method according to claim 10, characterized in that: The vehicle charging control method further includes: In the process of controlling the voltage conversion module to perform voltage conversion on the battery voltage provided by the power battery so that the voltage at the second end of the voltage conversion module increases from the first voltage reduction target value to the voltage reduction limit value, if it is detected that the second charging pile and the second charging port begin to establish a connection, then controlling the voltage conversion module to perform voltage conversion on the battery voltage provided by the power battery so that the voltage at the second end of the voltage conversion module remains at the current voltage; and When it is determined that the second charging pile is connected, the voltage conversion module is controlled to convert the battery voltage provided by the power battery, so that the voltage at the second end of the voltage conversion module continues to increase from the current voltage to the voltage reduction limit value.

18. The vehicle charging control method according to claim 11, characterized in that: The vehicle charging control method further includes: In a process in which the power battery is charged by only the first charging pile through the boost charging circuit, determining a first limit value as the step-down limit value; and In the process where the first charging pile and the second charging pile jointly charge the power battery through the boost charging circuit, the second limit value is determined as the step-down limit value.

19. The vehicle charging control method according to claim 18, characterized in that: The first limit value is the minimum value between the first preset voltage difference and the second preset voltage difference, and the second preset voltage difference is the difference between the highest output voltage of the first charging pile and the third voltage value.

20. The vehicle charging control method according to claim 18, characterized in that: The second limit value is the minimum value between the first preset voltage difference and the third preset voltage difference, and the third preset voltage difference is the difference between the minimum value between the highest output voltage of the first charging pile and the highest output voltage of the second charging pile and the third voltage value.

21. The vehicle charging control method according to claim 10, characterized in that: After controlling the second switch to be turned on, the vehicle charging control method further includes: sending a first demand current value to the first charging pile, so that the first charging pile outputs a corresponding charging current to the first charging port based on the first demand current value.

22. The vehicle charging control method according to claim 21, characterized in that: The first required current value is determined based on at least one of a current charging parameter of the power battery and a current first temperature value of the first charging port.

23. The vehicle charging control method according to claim 22, characterized in that: The first demand current value is determined based on a current first target current value and a first temperature coefficient, wherein the current first target current value is determined based on a current charging parameter of the power battery; and the first temperature coefficient is a temperature coefficient corresponding to the current first temperature value.

24. The vehicle charging control method according to claim 8 or 11, characterized in that: After controlling the second switch to be turned on, the vehicle charging control method further includes: sending a first required voltage value to the first charging pile, so that the first charging pile outputs a corresponding charging voltage to the first charging port based on the first required voltage value.

25. The vehicle charging control method according to claim 24, characterized in that: The first required voltage value is determined based on the maximum allowable charging voltage of the vehicle and the maximum output voltage of the first charging pile.

26. The vehicle charging control method according to any one of claims 14 to 16, characterized in that: After controlling the fourth switch to be turned on, the vehicle charging control method further includes: A second required current value is sent to the second charging pile, so that the second charging pile outputs a corresponding charging current to the second charging port based on the second required current value.

27. The vehicle charging control method according to claim 26, characterized in that: The second required current value is determined based on at least one of a current charging parameter of the power battery and a current second temperature value of the second charging port.

28. The vehicle charging control method according to claim 27, characterized in that: The second required current value is determined based on the current second target current value and the second temperature coefficient, wherein the current second target current value is determined based on the current charging parameters of the power battery; and the second temperature coefficient is a temperature coefficient corresponding to the current second temperature value.

29. The vehicle charging control method according to any one of claims 14 to 16, characterized in that: After controlling the fourth switch to be turned on, the vehicle charging control method further includes: sending a second required voltage value to the second charging pile, so that the second charging pile outputs a corresponding charging voltage to the second charging port based on the second required voltage value.

30. The vehicle charging control method according to claim 29, characterized in that: The second required voltage value is determined based on the maximum allowable charging voltage of the vehicle and the maximum output voltage of the second charging pile.

31. A vehicle charging system, characterized in that: The vehicle charging control method comprises two charging ports, a boost charging circuit, a direct charging circuit and a control module. The first end of the boost charging circuit and the first end of the direct charging circuit are electrically connected to the two charging ports respectively. The second end of the boost charging circuit and the second end of the direct charging circuit are suitable for being electrically connected to a power battery. The control module is electrically connected to the two charging ports, the boost charging circuit and the direct charging circuit, and is used to control the execution of the steps in the vehicle charging control method as described in any one of claims 1 to 30.

32. A vehicle, characterized in that: Includes a power battery and a vehicle charging system as claimed in claim 31.

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