Vehicle charging control method, vehicle charging system, and vehicle

Abstract

A vehicle charging control method, a vehicle charging system (100) applying the method, and a vehicle (1). The vehicle charging control method comprises: after a first charging port (11) of a vehicle (1) is connected to a first charging pile, controlling, on the basis of the magnitude relationship between a first insulation detection voltage of the first charging port (11) and the highest allowable charging voltage of the vehicle (1), a boost charging circuit (20) to operate, so as to charge a power battery (200).

Description

Vehicle charging control method, vehicle charging system and vehicle

[0001] The present application claims priority to Chinese application No. 202410823884.4, filed on June 24, 2024, entitled: Vehicle charging control method, vehicle charging system and vehicle, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] Embodiments of the present application relate to, but are not limited to, the technical field of vehicle control, and in particular to a vehicle charging control method, a vehicle charging system and a vehicle. BACKGROUND

[0003] Under the background of the country promoting the development of new energy vehicles, the popularity of electric vehicles is becoming higher and higher, but in the development process, it is gradually found that consumers' demand for fast energy replenishment of electric vehicles is also becoming higher and higher. Therefore, various ways of high-power charging or battery replacement fast energy replenishment schemes have emerged. Among them, the double-gun charging scheme can not only use existing facilities, but also improve the charging rate, and can well meet the demand for fast energy replenishment at the present stage in terms of cost performance. However, for an 800V whole vehicle high-voltage system architecture, only two high-voltage charging piles are supported for charging, and a high-voltage and a low-voltage or two low-voltage specifications of charging piles cannot be supported for simultaneous charging. TECHNICAL SOLUTION

[0004] 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.

[0005] The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.

[0006] To achieve the above-mentioned purpose, the first aspect of the present application provides a vehicle charging control method, the vehicle charging control method comprising:

[0007] In response to the first charging port of the vehicle being connected to the first charging pile, obtaining a first insulation detection voltage of the first charging port; and

[0008] According to the size relationship between the first insulation detection voltage and the highest allowable charging voltage of the vehicle, controlling the boost charging circuit to work to convert the charging voltage provided by the first charging pile to boost and charge the power battery, or controlling the direct charging circuit to work to receive the charging voltage provided by the first charging pile to directly charge the power battery.

[0009] The vehicle charging control method provided in the application can make any charging port in the vehicle charging system compatible with high-voltage charging piles and low-voltage charging piles, and has higher compatibility and wider applicability.

[0010] The second aspect of the application also provides a vehicle charging system, which comprises two charging ports, a voltage boosting charging circuit, a direct charging circuit and a controller, the first end of the voltage boosting charging circuit and the first end of the direct charging circuit are electrically connected with the two charging ports respectively, the second end of the voltage boosting charging circuit and the second end of the direct charging circuit are adapted to be electrically connected with a power battery, the controller is electrically connected with the two charging ports, the voltage boosting charging circuit and the direct charging circuit, and is used for controlling the steps in the vehicle charging control method of the first aspect.

[0011] The third aspect of the application also provides a vehicle, which comprises a power battery and the vehicle charging system of the second aspect.

[0012] Additional aspects and advantages of the application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0013] Fig. 1 is a schematic diagram of the topology of the vehicle charging system provided in the embodiment of the application;

[0014] Fig. 2 is a flow chart of the vehicle charging control method provided in the embodiment of the application.

[0015] The reference signs are explained as follows:

[0016] The following specific embodiments will explain the application in combination with the above-mentioned drawings.

[0017] Embodiments of the application

[0018] The technical solutions in the embodiments of the application will be described clearly and completely in combination with the drawings in the embodiments of the application. Obviously, the described embodiments are only some of the embodiments of the application, but not all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative effort belong to the protection scope of the application.

[0019] Moreover, the terms "first", "second", and the like in the description of the application do not necessarily imply a specific order or sequence, but are used to distinguish between similar objects. It should be understood that the data thus used can be interchanged, where appropriate, so that the embodiments of the application described herein can be carried out in other than the order shown or described herein. Furthermore, the terms "comprise" and "have" and any variations thereof are intended to cover a non-exclusive inclusion, for example, a process, method, system, product, or apparatus that comprises a list of steps or devices not necessarily limited to those specifically listed, but can include other steps or devices not expressly listed or inherent to such process, method, product, or apparatus.

[0020] It should be noted that the features in the embodiments of the application can be combined with each other without conflict.

[0021] Please refer to FIG. 1 and FIG. 2, FIG. 1 is a topological structure diagram of a vehicle charging system provided by an embodiment of the application; and FIG. 2 is a flow chart of a vehicle charging control method provided by an embodiment of the application. The application provides a vehicle charging control method, which is applied to the vehicle charging system 100 shown in FIG. 1.

[0022] As shown in FIG. 1, 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 embodiment of the application, the two charging ports are both direct current charging ports.

[0023] As shown in FIG. 2, the vehicle charging control method includes:

[0024] Step S1, after the first charging port 11 of the vehicle 1 is connected to the first charging pile, a first insulation detection voltage of the first charging port 11 is obtained; and

[0025] Step S2, according to the size relationship between the first insulation detection voltage and the highest allowable charging voltage of the vehicle 1, the boost charging circuit 20 is controlled to work to convert the charging voltage provided by the first charging pile and charge the power battery 200, or the direct charging circuit 30 is controlled to work to directly receive the charging voltage provided by the first charging pile and charge the power battery 200.

[0026] Among them, the first charging port 11 is the charging port that is first connected to the charging pile.

[0027] The vehicle charging control method provided in the application can make any charging port in the vehicle charging system 100 compatible with high-voltage charging piles and low-voltage charging piles, and has higher compatibility and wider applicability.

[0028] In the embodiments of the application, the vehicle charging system 100 is a high-voltage system, for example, an 800V whole-vehicle high-voltage system. The charging process of the vehicle charging system 100 includes four stages of charging handshake, parameter matching, charging stage, and charging completion. Specifically, the vehicle charging system 100 identifies the charging pile specification in the charging handshake stage, selectively controls the operation of the boost charging circuit 20 or the direct charging circuit 30 according to the charging pile specification in the parameter matching stage, and in the charging stage, the vehicle charging system 100 sends the required current and voltage to the charging pile, triggering the charging pile to output the corresponding charging voltage and current to the power battery 200 through the boost charging circuit 20 or the direct charging circuit 30.

[0029] In some embodiments, the two charging ports include a charging port A and a charging port B, and the vehicle charging system 100 further includes a PDC (Power Domain Controller, power domain controller). The PDC is a core component in the vehicle charging system 100, and is used to control the charging loop of the charging port A and the communication between the charging port A and the charging pile. The application takes the charging port A 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 according to the determination result.

[0030] After the first charging port 11 of the vehicle 1 is connected with the first charging pile, the first insulation detection voltage of the first charging port 11 is obtained, including:

[0031] After the first charging port 11 of the vehicle 1 is connected with the first charging pile, the charging handshake stage is entered in response to the first start charging instruction input by the user; and

[0032] 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.

[0033] In some embodiments, according to the magnitude relationship between the first insulation detection voltage and the maximum allowed charging voltage of the vehicle 1, the voltage boosting charging circuit 20 is controlled to work to boost and convert the charging voltage provided by the first charging pile to charge the power battery 200, or the direct charging circuit 30 is controlled to work to directly receive the charging voltage provided by the first charging pile to charge the power battery 200, including:

[0034] According to the magnitude relationship between the first insulation detection voltage and the maximum allowed charging voltage of the vehicle 1 and the duration of the magnitude relationship, the voltage boosting charging circuit 20 is controlled to work to boost and convert the charging voltage provided by the first charging pile to charge the power battery 200, or the direct charging circuit 30 is controlled to work to directly receive the charging voltage provided by the first charging pile to charge the power battery 200.

[0035] Further, according to the magnitude relationship between the first insulation detection voltage and the maximum allowed charging voltage of the vehicle 1 and the duration of the magnitude relationship, the voltage boosting charging circuit 20 is controlled to work to boost and convert the charging voltage provided by the first charging pile to charge the power battery 200, or the direct charging circuit 30 is controlled to work to directly receive the charging voltage provided by the first charging pile to charge the power battery 200, including:

[0036] When the duration that the first insulation detection voltage is greater than or equal to the maximum allowed charging voltage is less than the first preset duration, the voltage boosting charging circuit 20 is controlled to work to boost and convert the charging voltage provided by the first charging pile to charge the power battery 200; and,

[0037] When the duration that the first insulation detection voltage is greater than or equal to the maximum allowed charging voltage is greater than or equal to the first preset duration, the direct charging circuit 30 is controlled to work to directly receive the charging voltage provided by the first charging pile to charge the power battery 200.

[0038] It is not difficult to understand that, since the vehicle charging system 100 is a high-voltage system, when the duration that the first insulation detection voltage is greater than or equal to the maximum allowed charging voltage 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 through the voltage boosting charging circuit 20 before the power battery 200 can be charged.

[0039] The vehicle charging system 100 can further include a BMS (Battery Management System), and the maximum allowed charging voltage of the vehicle 1 can be the maximum allowed charging total voltage of the BMS (e.g., 750 V). Exemplarily, the first preset time length can be 200 ms. Of course, in other embodiments, the PDC can also not consider the duration in which the first insulation detection voltage is greater than or equal to the maximum allowed charging voltage when determining the voltage level of the first charging pile, i.e., when the first insulation detection voltage is greater than or equal to the maximum allowed charging voltage, the boost charging circuit 20 is controlled to work to boost and convert the charging voltage provided by the first charging pile and then charge the power battery 200; when the first insulation detection voltage is less than the maximum allowed charging voltage, the boost charging circuit 20 is controlled to work to boost and convert the charging voltage provided by the first charging pile and then charge the power battery 200.

[0040] As shown in FIG. 1, in some embodiments, the boost charging circuit 20 includes a voltage converter 21 and a first switch K1. The first end of the voltage converter 21 is the second end of the boost charging circuit 20, the second end of the voltage converter 21 is electrically connected with 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.

[0041] The voltage converter 21 includes a motor 212 and an inverter 211. The inverter 211 includes an AC end and a DC end. The DC end is the first end of the voltage converter 21, and the AC end is electrically connected with the motor 212. The neutral point of the motor 212 is the second end of the voltage converter 21. When the motor 212 is used as a driving 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.

[0042] Exemplarily, as shown in FIG. 1, the inverter 211 includes three bridge arms, i.e., a first bridge arm, a second bridge arm, and a third bridge arm. 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. The motor 212 includes an A-phase winding WA, a B-phase winding WB, and a C-phase winding WC.

[0043] 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 end, the second connection end of the upper tube T1 is electrically connected with the first connection end of the lower tube T4 to form a midpoint of a first bridge arm, the second connection end of the upper tube T2 is electrically connected with the first connection end of the lower tube T5 to form a midpoint of a second bridge arm, the second connection end of the upper tube T3 is electrically connected with the first connection end of the lower tube T6 to form a midpoint of a 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 end, the first bus end and the second bus end form a direct current end, and the midpoint of the first bridge arm, the midpoint of the second bridge arm and the midpoint of the third bridge arm form an alternating current end. One end of the A-phase winding WA is electrically connected with the midpoint of the first bridge arm, one end of the B-phase winding WB is electrically connected with the midpoint of the second bridge arm, one end of the C-phase winding WC is electrically connected with 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.

[0044] 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 boost-buck circuit to convert the charging voltage provided by the charging pile and then charge the power battery 200.

[0045] In this way, the motor 212 and the inverter 211 can be multiplexed, and the design cost can be effectively reduced.

[0046] Specifically, taking the three-phase windings in the motor 212 and the three-phase bridge arms in the inverter 211 as examples, the on-off states of the upper tubes T1-T3 are controlled by a first pulse signal, and the on-off states of the lower tubes T4-T6 are controlled by a second pulse signal, and the first pulse signal and the second pulse signal are opposite, that is, when the first pulse signal is high, the second pulse signal is low, and when the first pulse signal is low, the second pulse signal is high.

[0047] During operation, in one pulse period, when the lower tubes T4-T6 are all turned on, the first charging pile can charge the three-phase windings of the motor 212, and when the upper tubes T1-T3 are all turned on, the first charging pile and the three-phase windings of the motor 212 can simultaneously charge the power battery 200, so that the power battery 200 can be boosted and charged.

[0048] Further, the boost charging circuit 20 further comprises 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, for maintaining the voltage of the first charging port 11 and / or the second charging port 12 stable. The capacitor C2 is electrically connected to the direct current end of the inverter 211, for maintaining the voltage of the direct current end of the inverter 211 stable.

[0049] The vehicle charging control method further comprises:

[0050] controlling the first switch K1 to be conductive; and

[0051] controlling the voltage converter 21 to charge the power battery 200 after boosting and converting the charging voltage provided by the first charging pile.

[0052] In some embodiments, the vehicle charging system 100 further comprises a second switch for controlling the electrical connection between the first charging port 11 and the boost charging circuit 20 and the direct charging circuit 30. For example, as shown in FIG. 1, the number of second switches is 2, including a second switch K21 and a second switch K22. The first end of the second switch K21 is electrically connected to the boost charging circuit 20 and the direct charging circuit 30, and the second end of the second switch K21 is electrically connected to the positive connection end of the first charging port 11. The first end of the second switch K22 is grounded, and the second end of the second switch K22 is electrically connected to the negative connection end of the first charging port 11.

[0053] Before controlling the voltage converter 21 to charge the power battery 200 after boosting and converting the charging voltage provided by the first charging pile, the vehicle charging control method further comprises:

[0054] controlling the voltage converter 21 to convert the battery voltage provided by the power battery 200, so that the voltage of the second end of the voltage converter 21 changes to a first voltage reduction target value; and

[0055] controlling the second switch to be conductive when the voltage of the second end of the voltage converter 21 is the first voltage reduction target value.

[0056] The first voltage reduction target value is the minimum value of a first preset voltage difference value and a preset low voltage reference value, and the first preset voltage difference value is the difference between the preset multiple of the current bus voltage value of the power battery 200 and the first voltage value.

[0057] In some embodiments, the vehicle charging system 100 further comprises a VTOG (Charging and Discharging Electric Machine Controller), which is configured 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 a first voltage reduction target value to the VTOG through a CAN (Controller Area Network) bus, and the VTOG generates a corresponding pulse signal to control the inverter 211 to reduce voltage according to the first voltage reduction target value. When the VTOG determines that the voltage value at the second end of the voltage converter 21 reaches the first voltage reduction target value, it feeds back a "voltage reduction complete" signal to the PDC, triggering the PDC to control the second switch to be turned on.

[0058] For example, 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.

[0059] It should be noted that the first insulation detection voltage can only be used to determine whether the first charging pile is a low-voltage pile, and the true maximum output voltage of the first charging pile can be sent out by the message later. Therefore, the first voltage reduction target value is set to a universally applicable value, i.e., 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, the battery voltage provided by the power battery 200 is reduced to the first voltage reduction target value by the voltage converter 21 before the second switch is controlled to be turned on, so that the voltage of the capacitor C1 is maintained at the first voltage reduction target value. In this way, it can be ensured that the voltage at the first end of the boost charging circuit 20 matches the charging voltage output by the first charging pile when the second switch is controlled to be turned on, and it can be prevented that the voltage at the first end of the boost charging circuit 20 exceeds the maximum output voltage of the first charging pile, causing the first charging pile to report an error and stop charging.

[0060] In some embodiments, the control of the voltage converter 21 to charge the power battery 200 after the boost conversion of the charging voltage provided by the first charging pile comprises:

[0061] The voltage converter 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 converter 21 increases from the first voltage reduction target value to a voltage reduction limit value.

[0062] It should be noted that, in the process of charging the power battery by the first charging pile through the boost charging circuit 20, since the current voltage of the power battery 200 will gradually increase, in the embodiment of the application, the PDC outputs a step-up 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, thereby causing the voltage at the second end of the voltage converter 21 to increase from the first step-down target value to the step-down limit value, which can improve the charging power output by the charging pile and improve the charging efficiency. Illustratively, the preset rate can be 2V per 1 second.

[0063] 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 converter 21 reaches the step-down limit value, at which time the second end of the voltage converter 21 can be controlled to be fixed at the step-down limit value to continue constant-voltage charging of the power battery 200.

[0064] In some embodiments, the vehicle charging control method further comprises:

[0065] In the process of charging the power battery 200 by the first charging pile through the boost charging circuit 20 only, 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,

[0066] In the process of charging the power battery by the first charging pile and the second charging pile through the boost charging circuit together, the second limit value is determined as the step-down limit value; wherein the second limit value is the minimum value of the first preset voltage difference value and the third preset voltage difference value, and the third preset voltage difference value is the difference between the minimum value of the highest output voltage of the first charging pile and the highest output voltage of the second charging pile and the third voltage value.

[0067] Illustratively, 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 highest output voltage of the first charging pile, and Umax2 is the highest output voltage of the second charging pile.

[0068] In this way, the first charging pile and the second charging pile can be prevented from interfering with each other due to different charging capacities.

[0069] As shown in FIG. 1, 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 the first end and the second end of the direct charging circuit 30, respectively. Specifically, as shown in FIG. 1, the first end of the third switch K3 is electrically connected with the second end of the first switch K1, and is electrically connected with the positive connection end of the first charging port 11 through the second switch K21, and is electrically connected with the positive 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 with the positive electrode of the power battery 200.

[0070] The control of the direct charging circuit 30 to work to receive the charging voltage provided by the first charging pile to directly charge the power battery 200 includes:

[0071] The third switch K3 is controlled to be turned on; and

[0072] 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.

[0073] Further, in some embodiments, before the third switch K3 is controlled to be turned on, the vehicle charging control method further includes:

[0074] When the first insulation detection voltage is greater than or equal to the highest allowed charging voltage for a duration greater than or equal to the first preset duration, the first switch K1 is controlled to be turned on;

[0075] The voltage converter 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 converter 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 the voltage value of the highest allowed 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

[0076] When it is determined that the voltage converter 21 is in a fully open state, the first switch K1 is controlled to be turned off.

[0077] 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 allowed charging voltage of the vehicle 1.

[0078] Specifically, in the parameter matching stage, the PDC outputs a second voltage reduction target value to the VTOG through the CAN bus, and the VTOG generates a corresponding pulse signal to control the inverter 211 to adjust the voltage according to the second voltage reduction target value. When the VTOG determines that the voltage value at the second end of the voltage converter 21 reaches the second voltage reduction target value, the VTOG feeds back a "full-on state" signal to the PDC. The PDC then controls the first switch K1 to be off, requests the VTOG to stop adjusting the voltage, and controls the third switch K3 to be on. In the full-on state of the voltage converter 21, the voltage converter 21 continuously connects the positive electrode of the power battery 200 to the first switch K1 and continuously disconnects the negative electrode of the power battery 200 from the first switch K1. Specifically, as shown in FIG. 1, in the full-on state, the lower tubes T4-T6 in the inverter 211 are all off, and at least one of the upper tubes T1-T3 is on.

[0079] In this way, regardless of whether the second charging pile is a high-voltage charging pile or a low-voltage charging pile, the PDC first outputs a corresponding voltage reduction target value to the VTOG, so that the VTOG controls the voltage converter 21 to adjust the voltage, and the control process is more unified.

[0080] In some embodiments, after controlling the second switch to be on, the vehicle charging control method further includes:

[0081] sending the 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.

[0082] The first demand current value is determined based on at least one of the current charging parameter of the power battery 200 and the current first temperature value of the first charging port 11.

[0083] For example, the current charging parameter of the power battery 200 includes at least one of the current battery voltage, the current SOC (State Of Charge), and the current battery temperature value.

[0084] 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, and the charging efficiency and safety are higher.

[0085] Further, the first demand current value is determined according to the current first target current value and a first temperature coefficient, wherein the current first target current value is determined based on the current charging parameter of the power battery 200, and the first temperature coefficient is a temperature coefficient corresponding to the current first temperature value.

[0086] For example, the first demand current value is the product of the current first target current value and the first temperature coefficient.

[0087] Specifically, the BMS can determine the first charging current currently required by the power battery 200 according to the current charging parameter of the power battery 200, and the PDC determines the minimum value between 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.

[0088] For example, the vehicle charging system 100 can store a one-to-one correspondence relationship between a plurality of temperature values and a plurality of temperature coefficients, in which the higher the temperature value, the lower the corresponding temperature coefficient, and the PDC can determine the first temperature coefficient corresponding to the current first temperature value according to the one-to-one correspondence relationship.

[0089] In this way, different first temperature coefficients can be obtained according to different first temperature values, which can avoid the temperature value of the first charging port 11 being too high during charging, and the safety is higher.

[0090] In some embodiments, after controlling the second switch to be turned on, the vehicle charging control method further comprises:

[0091] sending the first demand voltage value 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 demand voltage value.

[0092] The first demand voltage value is determined based on the maximum allowed charging voltage of the vehicle 1 and the maximum output voltage of the first charging pile. For example, the first demand voltage value is the minimum value between the maximum allowed charging voltage of the vehicle 1 and the maximum output voltage of the first charging pile.

[0093] In some embodiments, the vehicle charging control method further comprises:

[0094] After the second charging port 12 of the vehicle 1 is connected with 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 with the charging pile last; and

[0095] According to at least one of the size relationship between the second insulation detection voltage and the maximum allowed charging voltage of the vehicle 1 and the charging mode of the first charging pile, the second charging pile and the first charging pile are controlled to charge the power battery 200 in the same charging mode.

[0096] The charging mode includes a boost charging mode of charging the power battery 200 through the boost charging circuit 20 and a direct charging mode of charging the power battery 200 through the direct charging circuit 30.

[0097] 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, and has higher compatibility and wider applicability.

[0098] Specifically, in some embodiments, the vehicle charging system 100 further comprises a CCM (Charge Control Module, charging controller), which is configured to control the charging loop of the charging port B and the charging pile connected to the charging port B. In this application, the charging port B is taken as the second charging port 12 as an example. Specifically, the CCM is configured to determine whether the second charging pile is a high-voltage charging pile or a low-voltage charging pile, and is configured to control the on-off state of the fourth switch K41 and the fourth switch K42 in the following according to the determination result.

[0099] After the second charging port 12 of the vehicle 1 is connected to the second charging pile, the second insulation detection voltage of the second charging port 12 is obtained, including:

[0100] After the second charging port 12 of the vehicle 1 is connected to the second charging pile, the second charging port 12 enters a charging handshake phase in response to a second start charging instruction input by a user; and

[0101] 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.

[0102] In some embodiments, according to at least one of the size relationship between the second insulation detection voltage and the highest allowable charging voltage of the vehicle 1 and the charging mode of the first charging pile, the second charging pile and the first charging pile are controlled to charge the power battery 200 in the same charging mode, including:

[0103] When the charging mode of the first charging pile is the step-up charging mode, the second charging pile is controlled to charge the power battery 200 through the step-up charging circuit 20;

[0104] When the charging mode of the first charging pile is the direct charging mode, according to the size relationship between the second insulation detection voltage and the highest allowable charging voltage of the vehicle 1 and the time length maintained by the size relationship, the second charging pile and the first charging pile are controlled to jointly charge the power battery 200 through the step-up charging circuit 20 or jointly charge the power battery 200 through the direct charging circuit 30.

[0105] 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 highest allowable charging voltage of the vehicle 1 and the time length for which the magnitude relationship is maintained, the second charging pile and the first charging pile are controlled to jointly charge the power battery 200 through the step-up charging circuit 20 or jointly charge the power battery 200 through the direct charging circuit 30, including:

[0106] When the charging mode of the first charging pile is the direct charging mode and the time length for which the second insulation detection voltage is greater than or equal to the highest allowable charging voltage is greater than or equal to the second preset time length, the second charging pile is controlled to charge the power battery 200 through the direct charging circuit 30; and

[0107] When the charging mode of the first charging pile is the direct charging mode and the time length for which the second insulation detection voltage is greater than or equal to the highest allowable charging voltage is less than the second preset time length, the first charging pile is controlled to switch to charge the power battery 200 through the step-up charging circuit 20, and the second charging pile is controlled to charge the power battery 200 through the step-up charging circuit 20.

[0108] Exemplarily, the second preset time length is 200 ms.

[0109] It is not difficult to understand that when the time length for which the second insulation detection voltage is greater than or equal to the highest allowable charging voltage is greater than or equal to the second preset time length, it indicates that the second charging pile is a high-voltage charging pile, at this time, no matter whether the charging mode of the first charging pile is the direct charging mode or the step-up charging mode, the second charging pile can charge the power battery 200 in the same charging mode as the first charging pile. When the time length for which the second insulation detection voltage is greater than or equal to the highest allowable charging voltage is less than the second preset time length, it indicates that the second charging pile is a low-voltage charging pile, at this time, if the charging mode of the first charging pile is the direct charging mode, the second charging pile cannot directly charge the power battery 200 through the direct charging circuit 30, so the first charging pile needs to be controlled to switch to charge the power battery 200 through the step-up charging circuit 20, and then the second charging pile is controlled to charge the power battery 200 through the step-up charging circuit 20; if the charging mode of the first charging pile is the step-up charging mode, the second charging pile can directly charge the power battery 200 through the step-up charging circuit 20.

[0110] In other embodiments, the CCM can also not consider the time length for which the second insulation detection voltage is greater than or equal to the highest allowable charging voltage when judging the voltage level of the second charging pile.

[0111] In some embodiments, the vehicle charging system 100 further comprises a fourth switch for turning on or off 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, as shown in FIG. 1, the number of fourth switches is 2, including a fourth switch K41 and a fourth switch K42, the first end of the fourth switch K41 is electrically connected to the boost charging circuit 20 and the direct charging circuit 30, and the second end of the fourth switch K41 is electrically connected to the positive connection end of the second charging port 12. The first end of the fourth switch K42 is grounded, and the second end of the fourth switch K42 is electrically connected to the negative connection end of the second charging port 12.

[0112] Further, the control causes the second charging pile to charge the power battery 200 through the boost charging circuit 20, including:

[0113] When the second charging port 12 meets the charging condition, the fourth switch is turned on, so that the second charging pile charges the power battery 200 through the boost charging circuit 20.

[0114] The control causes the second charging pile to charge the power battery 200 through the direct charging circuit 30, including:

[0115] When the second charging port 12 meets the charging condition, the fourth switch is turned on, so that the second charging pile charges the power battery 200 through the direct charging circuit 30.

[0116] The control causes the first charging pile to switch to charge the power battery 200 through the boost charging circuit 20, and causes the second charging pile to charge the power battery 200 through the boost charging circuit 20, including:

[0117] The first switch K1 is turned on;

[0118] The third switch K3 is turned off, so that the first charging pile switches to charge the power battery 200 through the boost charging circuit 20;

[0119] The voltage converter 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 converter 21 changes to a first step-down target value; and,

[0120] When the second charging port 12 meets the charging condition, the fourth switch is turned on, so that the second charging pile charges the power battery 200 through the boost charging circuit 20.

[0121] The charging condition is that the voltage of the second charging port 12 is lower than a preset pressure relief threshold after the second charging pile stops outputting the second insulation detection voltage, and the charging message interaction is normal. Exemplarily, the preset pressure relief threshold is 60V, so that the second charging pile can be ensured to fully discharge the residual charge before the fourth switch is controlled to be turned on, thereby avoiding the generation of electric arc when the fourth switch is turned on, and the safety is higher.

[0122] It should be noted that, as described above, in the process of charging the power battery 200 by the first charging pile, the PDC outputs a gradually increasing voltage reduction target value to the VTOG according to a preset rate, so that the voltage at the second end of the voltage converter 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 in the process of voltage conversion by the voltage converter 21, it may cause the second charging pile to detect that the voltage deviation rate of the second charging port 12 is greater than 5% and stop charging.

[0123] Therefore, in order to improve the stability of the second charging pile, in some embodiments, the vehicle charging control method further comprises:

[0124] In the process of controlling the voltage converter 21 to convert the battery voltage provided by the power battery 200, so that the voltage at the second end of the voltage converter 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 converter 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 converter 21 remains at the current voltage; and,

[0125] When it is determined that the second charging pile completes the connection, the voltage converter 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 converter 21 continues to increase from the current voltage to the voltage reduction limit value.

[0126] The second charging pile completes the connection means that the charging circuit between the second charging pile and the power battery 200 is established, specifically, as shown in FIG. 1, after the fourth switch is turned on, it means that the second charging pile completes the connection.

[0127] In some embodiments, after the fourth switch is turned on, the vehicle charging control method further comprises:

[0128] sending a second demand current value 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 demand current value.

[0129] The second demand current value is determined based on at least one of the current charging parameter of the power battery 200 and the current second temperature value of the second charging port 12.

[0130] Therefore, the charging current of the second charging pile can be allocated according to at least one of the current charging parameter and the current second temperature value of the power battery 200, and the charging efficiency and safety are higher.

[0131] Further, the second demand current value is determined according to the current second target current value and a second temperature coefficient, wherein the current second target current value is determined based on the current charging parameter of the power battery 200, and the second temperature coefficient is a temperature coefficient corresponding to the current second temperature value.

[0132] For example, the second demand current value is a product of the current second target current value and the second temperature coefficient.

[0133] 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 parameter of the power battery 200, and the CCM determines the second charging current determined by the BMS as the current second target current value.

[0134] For example, the vehicle charging system 100 can store a one-to-one correspondence relationship between a plurality of temperature values and a plurality of temperature coefficients, and the CCM can determine the second temperature coefficient corresponding to the current second temperature value according to the one-to-one correspondence relationship.

[0135] In some embodiments, after controlling the second switch K2 to be turned on, the vehicle charging control method further comprises:

[0136] sending the second demand 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 demand voltage value.

[0137] The second demand voltage value is determined based on the maximum allowed charging voltage of the vehicle 1 and the maximum output voltage of the second charging pile. For example, the second demand voltage value is the minimum value of the maximum allowed charging voltage of the vehicle 1 and the maximum output voltage of the second charging pile.

[0138] Please refer to Fig. 1 again. Based on the same inventive concept, the present application also provides a vehicle charging system 100, which comprises two charging ports, a boost charging circuit 20, a direct charging circuit 30, and a controller (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. The second end of the boost charging circuit 20 and the second end of the direct charging circuit 30 are adapted to be electrically connected to the power battery 200. The controller 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 steps in the vehicle charging control method of any one of the above embodiments.

[0139] The controller can include the PDC, the VTOG, the BMS, and the CCM in the above, and the controller can perform the corresponding steps through at least one of the PDC, the VTOG, the BMS, and the CCM. For details, refer to the foregoing, which will not be repeated here.

[0140] Please refer to Fig. 1 again. Based on the same inventive concept, the application further provides a vehicle 1 comprising the power battery 200 and the vehicle charging system 100 of the above embodiment.

[0141] The vehicle charging system 100 and the vehicle 1 provided by the application can make any charging port in the vehicle charging system 100 compatible with high-voltage charging piles and low-voltage charging piles by setting the boost charging circuit 20 and the direct charging circuit 30 and selectively controlling the boost charging circuit 20 or the direct charging circuit 30 to work according to the first insulation detection voltage of the first charging port 11, and have higher compatibility and wider applicability.

[0142] Based on the same inventive concept, the application further provides a computer readable storage medium, which stores computer instructions for execution by a processor after being called to implement the steps of the vehicle charging control method of any of the above embodiments.

[0143] The computer storage medium of the embodiments of the application can adopt any combination of one or more computer readable media. The computer readable medium can be a computer readable signal medium or a computer readable storage medium. The computer readable storage medium may, for example, but is not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or component, or any combination thereof. More specific examples (non-exhaustive list) of the computer readable storage medium include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In this document, the computer readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, device or component.

[0144] A computer readable signal medium can include a propagated data signal with computer executable code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated signal can take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium can be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate or transport programming code.

[0145] Program code embodied on a computer readable medium can be transmitted using any appropriate medium, including but not limited to wireless, wire line, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

[0146] Computer program code for carrying out operations of the present application can be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C++ or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code can execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the latter scenario, the remote computer can 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 the connection can be made to an external computer (for example, through the Internet using an Internet Service Provider).

[0147] While embodiments of the application have been shown and described, it is to be understood that the application is not limited to the details of the embodiments described, since the scope of the application is defined with respect to the appended claims.

[0148] While embodiments of the application have been shown and described, it is to be understood that the application is not limited to the details of the embodiments described, since the scope of the application is defined with respect to the appended claims.

Claims

1. A vehicle charging control method, wherein, The vehicle charging control method includes: In response to the connection of the vehicle's first charging port to the first charging pile, the first insulation detection voltage of the first charging port is acquired; and Based on the relationship between the first insulation detection voltage and the vehicle's maximum permissible charging voltage, the boost charging circuit is controlled to charge the power battery by boosting the charging voltage provided by the first charging pile, or the direct charging circuit is controlled to receive the charging voltage provided by the first charging pile and directly charge the power battery.

2. The vehicle charging control method as described in claim 1, wherein, The step of controlling the boost charging circuit to charge the power battery by boosting the charging voltage provided by the first charging pile based on the relationship between the first insulation detection voltage and the maximum permissible charging voltage of the vehicle, or controlling the direct charging circuit to receive the charging voltage provided by the first charging pile and directly charge the power battery, includes: Based on the relationship between the first insulation detection voltage and the vehicle's maximum permissible charging voltage, and the duration of this relationship, the boost charging circuit is controlled to charge the power battery by boosting the charging voltage provided by the first charging pile, or the direct charging circuit is controlled to receive the charging voltage provided by the first charging pile and directly charge the power battery.

3. The vehicle charging control method as described in claim 2, wherein, The step of controlling the boost charging circuit to charge the power battery by boosting the charging voltage provided by the first charging pile based on the relationship between the first insulation detection voltage and the maximum permissible charging voltage of the vehicle and the duration of the relationship, or controlling the direct charging circuit to receive the charging voltage provided by the first charging pile and directly charge the power battery, includes: In response to the duration during which the first insulation detection voltage is greater than or equal to the maximum permissible charging voltage being less than a first preset duration, the boost charging circuit is controlled to operate to boost the charging voltage provided by the first charging pile and then charge the power battery; and In response to the first insulation detection voltage being 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 any one of claims 1-3, wherein, The vehicle charging control method further includes: In response to the connection of the vehicle's second charging port to the second charging pile, the second insulation detection voltage of the second charging port is acquired; and Based on the relationship between the second insulation detection voltage and the maximum permissible charging voltage of the vehicle, and at least one of the charging methods of the first charging pile, the system controls the second charging pile to charge the power battery in the same charging method as the first charging pile; wherein the charging method includes a boost charging method that charges the power battery through the boost charging circuit and a direct charging method that charges the power battery through the direct charging circuit.

5. The vehicle charging control method as described in claim 4, wherein, The step of controlling the second charging pile to charge the power battery using the same charging method as the first charging pile, based on at least one of the following: the relationship between the second insulation detection voltage and the maximum permissible charging voltage of the vehicle, and the charging method of the first charging pile. In response to the first charging pile using boost charging, the control causes the second charging pile to charge the power battery through the boost charging circuit; and, In response to the first charging pile being charged in direct charging mode, based on the relationship between the second insulation detection voltage and the vehicle's maximum allowable charging voltage and the duration of maintaining the relationship, the system controls the second charging pile and the first charging pile to charge the power battery together through the boost charging circuit or together through the direct charging circuit.

6. The vehicle charging control method as described in claim 5, wherein, The charging method in response to the first charging pile is a direct charging method. Based on the relationship between the second insulation detection voltage and the vehicle's maximum permissible charging voltage, and the duration of this relationship, the system controls the second charging pile and the first charging pile to jointly charge the power battery through the boost charging circuit or jointly through the direct charging circuit, including: In response to the first charging pile using direct charging, 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, the system controls the second charging pile to charge the power battery through the direct charging circuit; and In response to the first charging pile being charged in 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 less than the second preset duration, the system controls the first charging pile to switch to charging the power battery through the boost charging circuit, and also controls the second charging pile to charge the power battery through the boost charging circuit.

7. The vehicle charging control method as described in claim 6, wherein, The control of the boost charging circuit to boost the charging voltage provided by the first charging pile to charge the power battery includes: Control the first switch to be turned on; and The control voltage converter boosts and converts the charging voltage provided by the first charging pile to charge the power battery. The boost charging circuit includes a voltage converter and a first switch. The first terminal of the voltage converter is the second terminal of the boost charging circuit. The second terminal of the voltage converter is electrically connected to the first terminal of the first switch, and the second terminal of the first switch is the first terminal of the boost charging circuit.

8. The vehicle charging control method as described in claim 7, wherein, Before the control voltage converter boosts the charging voltage provided by the first charging pile to charge the power battery, the vehicle charging control method further includes: The control voltage converter performs voltage conversion on the battery voltage provided by the power battery, so that the voltage at the second terminal of the voltage converter changes to a first target voltage reduction value; and In response to the voltage at the second terminal of the voltage converter being the first step-down target value, the second switch is controlled 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, as well as the electrical connection between the first charging port and the direct charging circuit.

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

10. The vehicle charging control method as described in claim 9, wherein, The control voltage converter boosts the charging voltage provided by the first charging pile to charge the power battery, including: The voltage converter is controlled to convert the battery voltage provided by the power battery, so that the voltage at the second terminal of the voltage converter increases from the first step-down target value to the step-down limit value.

11. The vehicle charging control method as described in claim 10, wherein, The control of the direct charging circuit to receive the charging voltage provided by the first charging pile and directly charge the power battery includes: Control the third switch to turn on; and Turn on the second switch to receive the charging voltage provided by the first charging pile to directly charge the power battery; The direct charging circuit includes a third switch, and the first and second ends of the third switch are respectively the first and second ends of the direct charging circuit.

12. The vehicle charging control method as described in claim 11, wherein, Before the third control switch is turned on, the vehicle charging control method further includes: In response to the first insulation detection voltage being greater than or equal to the maximum allowable charging voltage for a duration greater than or equal to a first preset duration, the first switch is controlled to be turned on; The voltage converter is controlled to convert the battery voltage supplied by the power battery, so that the voltage at the second terminal of the voltage converter changes to a second target voltage reduction value; and In response to determining that the voltage converter is in a fully open state, the first switch is controlled to open.

13. The vehicle charging control method as described in claim 12, wherein, The second voltage reduction target value is the minimum value between the preset voltage sum value and the voltage value of the vehicle's maximum allowable charging voltage, and the preset voltage sum value is the sum of the current bus voltage value of the power battery and the second voltage value.

14. The vehicle charging control method according to any one of claims 11-13, wherein, The control enables the second charging pile to charge the power battery through the boost charging circuit, including: In response to the second charging port meeting the charging conditions, the fourth switch is 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, which is used to connect or disconnect the electrical connection between the second charging port and the boost charging circuit, as well as the electrical connection between the second charging port and the direct charging circuit.

15. The vehicle charging control method as described in claim 14, wherein, The control enables the second charging pile to charge the power battery through the direct charging circuit, including: In response to the second charging port meeting the charging conditions, the fourth switch is turned on, so that the second charging pile charges the power battery through the direct charging circuit.

16. The vehicle charging control method as described in claim 14, wherein, The control causes the first charging pile to switch to charging the power battery through the boost charging circuit, and causes the second charging pile to charge the power battery through the boost charging circuit, including: Control the first switch to be turned on; The third switch is turned off, causing the first charging pile to switch to charging the power battery through the boost charging circuit; The voltage converter is controlled to convert the battery voltage supplied by the power battery, so that the voltage at the second terminal of the voltage converter changes to the first target voltage reduction value; and In response to the second charging port meeting the charging conditions, the fourth switch is turned on, so that the second charging pile charges the power battery through the boost charging circuit.

17. The vehicle charging control method as described in claim 10, wherein, The vehicle charging control method further includes: In response to controlling the voltage converter to perform voltage conversion on the battery voltage supplied by the power battery, such that the voltage at the second terminal of the voltage converter increases from the first step-down target value to the step-down limit value, if it is detected that the second charging pile and the second charging port have begun to establish a connection, then the voltage converter is controlled to perform voltage conversion on the battery voltage supplied by the power battery, so that the voltage at the second terminal of the voltage converter remains at the current voltage; and In response to determining that the second charging pile has completed the connection, the voltage converter is controlled to perform voltage conversion on the battery voltage provided by the power battery, so that the voltage at the second terminal of the voltage converter continues to increase from the current voltage to the step-down limit value.

18. The vehicle charging control method as described in claim 11, wherein, The vehicle charging control method further includes: In response to the charging of the power battery solely by the first charging pile through the boost charging circuit, the first limit value is determined as the buck limit value; and In response to 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 buck limit value.

19. The vehicle charging control method as described in claim 18, wherein, 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 as described in claim 18, wherein, The second limit value is the minimum value between the first preset voltage difference and the third preset voltage difference. 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 any one of claims 10-20, wherein, After the second control switch is 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 as described in claim 21, wherein, The first required current value is determined based on at least one of the current charging parameters of the power battery and the current first temperature value of the first charging port.

23. The vehicle charging control method as described in claim 22, wherein, 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; and the first temperature coefficient is a temperature coefficient corresponding to the current first temperature value.

24. The vehicle charging control method as described in claim 8 or 11, wherein, After the second control switch is turned on, the vehicle charging control method further includes: sending a first demand 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 demand voltage value.

25. The vehicle charging control method as described in claim 24, wherein, The first required voltage value is determined based on the vehicle's maximum permissible charging voltage and the first charging pile's maximum output voltage.

26. The vehicle charging control method according to any one of claims 14-16, wherein, After the fourth control switch is turned on, the vehicle charging control method further includes: Send a second required current value 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 as described in claim 26, wherein, The second required current value is determined based on at least one of the current charging parameters of the power battery and the current second temperature value of the second charging port.

28. The vehicle charging control method as described in claim 27, wherein, 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 14-16, wherein, After the fourth control switch is turned on, the vehicle charging control method further includes: sending a second demand 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 demand voltage value.

30. The vehicle charging control method as described in claim 29, wherein, The second required voltage value is determined based on the vehicle's maximum permissible charging voltage and the second charging pile's maximum output voltage.

31. A vehicle charging system, wherein, The device includes two charging ports, a boost charging circuit, a direct charging circuit, and a controller. The first terminal of the boost charging circuit and the first terminal of the direct charging circuit are respectively electrically connected to the two charging ports. The second terminal of the boost charging circuit and the second terminal of the direct charging circuit are both adapted to be electrically connected to the power battery. The controller 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 1-30.

32. A vehicle, wherein, This includes a power battery and a vehicle charging system as described in claim 31.

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