Vehicle charging control method, vehicle charging system, and vehicle

Abstract

The application provides a vehicle charging control method, a vehicle charging system and a vehicle. The vehicle charging control method comprises the following steps: after a first charging port of the vehicle is connected with a first charging pile, a first insulation detection voltage of the first charging port is obtained; and according to the size relationship between the first insulation detection voltage and the maximum allowable charging voltage of the vehicle, the boosting charging circuit is controlled to work to boost and convert the charging voltage provided by the first charging pile and then charge the power battery, or the direct charging circuit is controlled to work to receive the charging voltage provided by the first charging pile and directly charge the power battery. The vehicle charging control method can make any charging port in the vehicle charging system compatible with high-voltage charging piles and low-voltage charging piles.

Description

Technical Field

[0001] This 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 Technology

[0002] As electric vehicles become increasingly popular, consumers are increasingly demanding faster charging. This has led to the development of various high-power charging or battery swapping solutions. Among these, dual-gun charging solutions utilize existing infrastructure and improve charging speed, offering a cost-effective solution to meet current needs for rapid charging. However, the 800V vehicle high-voltage system architecture only supports two high-voltage charging stations, not one high-voltage and one low-voltage, or two low-voltage charging stations simultaneously. Summary of the Invention

[0003] To solve the above-mentioned technical problems, or at least partially solve them, this disclosure provides a vehicle charging control method, a vehicle charging system, and a vehicle.

[0004] To achieve the above objectives, a first aspect of this application provides a vehicle charging control method, the vehicle charging control method comprising:

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

[0006] 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.

[0007] The vehicle charging control method provided in this application, by setting up 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, allows any charging port in the vehicle charging system to be compatible with both high-voltage charging piles and low-voltage charging piles, resulting in higher compatibility and wider applicability.

[0008] A second aspect of this application also provides a vehicle charging system, which includes two charging ports, a boost charging circuit, a direct charging circuit, and a control module. 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 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.

[0009] A third aspect of this application also provides a vehicle, the vehicle including a power battery and the vehicle charging system described in the second aspect above.

[0010] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the topology of the vehicle charging system provided in the embodiments of this application;

[0012] Figure 2 This is a flowchart of the vehicle charging control method provided in the embodiments of this application.

[0013] The annotations in the attached figures are explained as follows:

[0014]

[0015] The following detailed description of the embodiments will be provided in conjunction with the above-described drawings. Detailed Implementation

[0016] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0017] Furthermore, the terms "first," "second," etc., used in this specification are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Additionally, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0018] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0019] Please refer to the following: Figures 1-2 , Figure 1 This is a schematic diagram of the topology of the vehicle charging system provided in the embodiments of this application; Figure 2 This is a flowchart of a vehicle charging control method provided in an embodiment of this application. This application provides a vehicle charging control method, which is applied to... Figure 1 The vehicle charging system 100 shown is shown.

[0020] 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 terminals of both the boost charging circuit 20 and the direct charging circuit 30 are electrically connected to both charging ports simultaneously. The second terminals of both the boost charging circuit 20 and the direct charging circuit 30 are electrically connected to the power battery 200. In this application, both charging ports are DC charging ports.

[0021] like Figure 2 As shown, the vehicle charging control method includes:

[0022] Step S1: After the first charging port 11 of vehicle 1 is connected to the first charging pile, the first insulation detection voltage of the first charging port 11 is obtained; and,

[0023] Step S2: Based on the relationship between the first insulation detection voltage and the maximum allowable charging voltage of vehicle 1, control the boost charging circuit 20 to work and boost the charging voltage provided by the first charging pile to charge the power battery 200, or control 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.

[0024] Among them, the first charging port 11 is the charging port that first establishes a connection with the charging pile.

[0025] The vehicle charging control method provided in this application, by setting up 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, allows any charging port in the vehicle charging system 100 to be compatible with both high-voltage charging piles and low-voltage charging piles, resulting in higher compatibility and wider applicability.

[0026] In this application, the vehicle charging system 100 is a high-voltage system, such as 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, in the charging handshake stage, the vehicle charging system 100 identifies the charging pile specifications. In the parameter matching stage, it selectively controls the boost charging circuit 20 or the direct charging circuit 30 to operate according to the charging pile specifications. 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 charging current through the boost charging circuit 20 or the direct charging circuit 30 to charge the power battery 200.

[0027] In some embodiments, the two charging ports include charging port A and charging port B. The vehicle charging system 100 also includes a PDC (Power Domain Controller). The PDC is a core component of the vehicle charging system 100 and is used to control the charging circuit of charging port A and to communicate with the charging pile connected to charging port A. Taking charging port A as the first charging port 11 as an example, 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 mentioned below according to the determination result.

[0028] After the first charging port 11 of vehicle 1 is connected to the first charging pile, the first insulation detection voltage of the first charging port 11 is obtained, including:

[0029] After the first charging port 11 of vehicle 1 is connected to the first charging pile, it enters the charging handshake stage in response to the first start charging command input by the user; and,

[0030] During the charging handshake phase, 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.

[0031] In some embodiments, based on the relationship between the first insulation detection voltage and the maximum permissible charging voltage of the vehicle 1, the boost charging circuit 20 is controlled to operate to boost the charging voltage provided by the first charging pile and then charge the power battery 200; or the direct charging circuit 30 is controlled to operate to receive the charging voltage provided by the first charging pile and directly charge the power battery 200, including:

[0032] Based on the relationship between the first insulation detection voltage and the maximum allowable charging voltage of vehicle 1, and the duration of the relationship, the boost charging circuit 20 is controlled to work to boost the charging voltage provided by the first charging pile and then charge the power battery 200, or the direct charging circuit 30 is controlled to work to receive the charging voltage provided by the first charging pile and directly charge the power battery 200.

[0033] Furthermore, based on the relationship between the first insulation detection voltage and the maximum permissible charging voltage of vehicle 1, and the duration of this relationship, the boost charging circuit 20 is controlled to operate to boost the charging voltage provided by the first charging pile and then charge the power battery 200; or the direct charging circuit 30 is controlled to operate to receive the charging voltage provided by the first charging pile and directly charge the power battery 200, including:

[0034] When the duration for which the first insulation detection voltage is greater than or equal to the maximum permissible charging voltage is less than a first preset duration, the boost charging circuit 20 is controlled to operate to boost the charging voltage provided by the first charging pile and then charge the power battery 200; and,

[0035] When the duration of the first insulation detection voltage being 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.

[0036] It is easy to understand that since the vehicle charging system 100 is a high-voltage system, when the duration of the first insulation detection voltage being greater than or equal to the maximum allowable 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 boost charging circuit 20 in order to charge the power battery 200.

[0037] The vehicle charging system 100 may further include a BMS (Battery Management System). The maximum allowable charging voltage of the vehicle 1 may be the maximum allowable total charging voltage of the BMS (e.g., 750V). For example, the first preset duration may be 200ms. Of course, in other embodiments, when the PDC determines the voltage level of the first charging pile, it may not consider the duration during which the first insulation detection voltage is greater than or equal to the maximum allowable charging voltage. That is, when the first insulation detection voltage is greater than or equal to the maximum allowable charging voltage, the PDC controls the boost charging circuit 20 to work and boost the charging voltage provided by the first charging pile to charge the power battery 200; when the first insulation detection voltage is less than the maximum allowable charging voltage, the PDC controls the boost charging circuit 20 to work and boost the charging voltage provided by the first charging pile to charge the power battery 200.

[0038] 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, and the second end of the voltage conversion module 21 is electrically connected to the first end of the first switch K1. The second end of the first switch K1 is the first end of the boost charging circuit 20.

[0039] The voltage conversion module 21 includes a motor 212 and an inverter 211. The inverter 211 has an AC terminal and a DC terminal. The DC terminal is the first terminal of the voltage conversion module 21, and the AC terminal is electrically connected to the motor 212. The neutral point of the motor 212 is the 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.

[0040] For example, such as Figure 1 As shown, the inverter 211 includes three bridge arms, namely the first bridge arm, the second bridge arm and the third bridge arm. The first bridge arm includes the upper tube T1 and the lower tube T4, the second bridge arm includes the upper tube T2 and the lower tube T5, and the third bridge arm includes the upper tube T3 and the lower tube T6. The motor 212 includes the A-phase winding WA, the B-phase winding WB and the C-phase winding WC.

[0041] The first connection terminals of the upper tube T1, the upper tube T2, and the upper tube T3 are connected together to form the first bus terminal. The second connection terminal of the upper tube T1 and the first connection terminal of the lower tube T4 are electrically connected to form the midpoint of the first bridge arm. The second connection terminal of the upper tube T2 and the first connection terminal of the lower tube T5 are electrically connected to form the midpoint of the second bridge arm. The second connection terminal of the upper tube T3 and the first connection terminal of the lower tube T6 are electrically connected to form the midpoint of the third bridge arm. The second connection terminals of the lower tube T4, the lower tube T5, and the lower tube T6 are connected together to form the second bus terminal. The first and second bus terminals constitute the DC terminal. The midpoints of the first, second, and third bridge arms constitute the AC terminal. One end of phase A winding WA is electrically connected to the midpoint of the first bridge arm, one end of phase B winding WB is electrically connected to the midpoint of the second bridge arm, one end of phase C winding WC is electrically connected to the midpoint of the second bridge arm, and the other ends of phase A winding WA, phase B winding WB, and phase C winding WC are connected together to form the neutral point of motor 212.

[0042] During charging, at least one phase winding of motor 212 and at least one corresponding bridge arm in inverter 211 can form a step-up / step-down circuit to step up the charging voltage provided by the charging pile before charging the power battery 200.

[0043] In this way, the motor 212 and inverter 211 can be reused, which can effectively reduce design costs.

[0044] Specifically, taking the three-phase windings in motor 212 and the three-phase bridge arms in inverter 211 as examples of step-up / step-down circuits, the charging and discharging of the motor windings is controlled by controlling the on / off state of each switch in the three-phase bridge arms, thereby achieving the step-up / step-down effect. More specifically, a first pulse signal can be used to control the on / off state of the upper transistors T1 to T3, and a second pulse signal can be used to control the on / off state of the lower transistors T4 to T6. The first and second pulse signals are out of phase; 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.

[0045] During operation, when all three phases of the lower tube T4 to T6 are turned on in one pulse cycle, the first charging pile can charge the three-phase winding of the motor 212. When all three phases of the upper tube T1 to T3 are turned on, the first charging pile and the three-phase winding of the motor 212 can charge the power battery 200 simultaneously. In this way, the boost charging of the power battery 200 can be achieved.

[0046] Furthermore, the boost charging circuit 20 also includes capacitors C1 and C2. Capacitor C1 is electrically connected between the second terminal of the first switch K2 and ground to maintain a stable voltage at the first charging port 11 and / or the second charging port 12. Capacitor C2 is electrically connected to the DC terminal of the inverter 211 to maintain a stable voltage at the DC terminal of the inverter 211.

[0047] The boost charging circuit 20 is controlled to operate to boost the charging voltage provided by the first charging pile and then charge the power battery 200, including:

[0048] Control the first switch K1 to be turned on; and,

[0049] The control voltage conversion module 21 converts the charging voltage provided by the first charging pile into a boost voltage to charge the power battery 200.

[0050] In some embodiments, the vehicle charging system 100 further includes a second switch for connecting or disconnecting 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, as... Figure 1 As shown, there are two second switches, including a second switch K21 and a second switch K22. The first end of the second switch K21 is electrically connected to both 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 terminal 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 terminal of the first charging port 11.

[0051] Before the power battery 200 is charged after the voltage conversion module 21 boosts and converts the charging voltage provided by the first charging pile, the vehicle charging control method also includes:

[0052] The control voltage conversion module 21 performs voltage conversion on the battery voltage provided by the power battery 200, so that the voltage at the second terminal of the voltage conversion module 21 changes to the first step-down target value; and,

[0053] When the voltage at the second terminal of the voltage conversion module 21 is the first step-down target value, the second switch is turned on.

[0054] The first voltage reduction target value is the minimum value between the first preset voltage difference and the preset low voltage reference value. The first preset voltage difference is the difference between a preset multiple of the current bus voltage value of the power battery 200 and the first voltage value.

[0055] In some embodiments, the vehicle charging system 100 also includes a VTOG (Charging and Discharging Electric Machine Controller), which outputs pulse signals to the inverter 211 to control the operating state of the inverter 211. During the parameter matching phase, the PDC outputs a first buck target value to the VTOG via the CAN (Controller Area Network) bus. The VTOG generates a corresponding pulse signal based on the first buck target value to control the inverter 211 to perform voltage regulation. When the VTOG determines that the voltage value at the second terminal of the voltage conversion module 21 has reached the first buck target value, it feeds back a "buck reduction complete" signal to the PDC, triggering the PDC to control the second switch to turn on.

[0056] For example, if the preset multiplier 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.

[0057] It should be noted that the first insulation detection voltage alone can determine whether the first charging pile is a low-voltage pile. The actual maximum output voltage of the first charging pile is only sent out via a message later. Therefore, the first voltage reduction target value should be set to a universally applicable value, i.e., first voltage reduction target value = min{0.95Ubat-10V, 420V}. When the first charging pile is determined to be a low-voltage charging pile, before controlling the second switch to turn on, the voltage conversion module 21 reduces the battery voltage provided by the power battery 200 to the first voltage reduction target value, so that the voltage of capacitor C1 remains at the first voltage reduction target value. In this way, when controlling the second switch to turn on, 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, preventing the voltage at the first end of the boost charging circuit 20 from exceeding the maximum output voltage of the first charging pile, causing the first charging pile to report an error and stop charging.

[0058] In some embodiments, the control voltage conversion module 21 boosts the charging voltage provided by the first charging pile to charge the power battery 200, including:

[0059] The control voltage conversion module 21 performs voltage conversion on the battery voltage provided by the power battery 200, so that the voltage at the second terminal of the voltage conversion module 21 increases from the first step-down target value to the step-down limit value.

[0060] It should be noted that during the charging process of the first charging pile through the boost charging circuit 20, the current voltage of the power battery 200 gradually increases. Therefore, in this application, the PDC outputs a step-down target value that gradually increases at a preset rate to the VTOG, causing the VTOG to control the on / off state of the switching transistor in the inverter 211. This causes the voltage at the second terminal of the voltage conversion module 21 to increase from the first step-down target value to the step-down limit value, thereby increasing the charging power output of the charging pile and improving charging efficiency. For example, the preset rate can be an increase of 2V every second.

[0061] 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 its maximum capacity, the voltage at the second terminal of the voltage conversion module 21 reaches the voltage reduction limit value. At this time, the second terminal of the voltage conversion module 21 can be fixed at the voltage reduction limit value to continue to charge the power battery 200 at a constant voltage.

[0062] In some embodiments, the vehicle charging control method further includes:

[0063] During the charging process of the power battery 200 by the first charging pile through the boost charging circuit 20 alone, the first limit value is determined as the voltage reduction limit value; 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; and,

[0064] During the process of the first charging pile and the second charging pile charging the power battery together through the boost charging circuit, the second limit value is determined as the voltage reduction 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.

[0065] For example, if 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}, where 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.

[0066] This avoids interference between the first and second charging stations due to their different charging capabilities.

[0067] like Figure 1As shown, in some embodiments, the direct charging circuit 30 includes a third switch K3, the first terminal and the second terminal of the third switch K3 being the first terminal and the second terminal of the direct charging circuit 30, respectively. Specifically, as... 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 terminal of the first charging port 11 through the second switch K21, and is electrically connected to the positive terminal of the second charging port 12 through the fourth switch K41. The second end of the third switch K3 is electrically connected to the positive terminal of the power battery 200.

[0068] 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, including:

[0069] Control the third switch K3 to be turned on; and,

[0070] The second switch is turned on to receive the charging voltage provided by the first charging pile and directly charge the power battery 200.

[0071] Furthermore, in some embodiments, the vehicle charging control method further includes the following before controlling the third switch K3 to turn on:

[0072] When the duration of the first insulation detection voltage being 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 turned on.

[0073] The control voltage conversion module 21 performs voltage conversion on the battery voltage provided by the power battery 200, causing the voltage at the second terminal of the voltage conversion module 21 to change to a second voltage reduction target value; wherein, the second voltage reduction target value is the minimum value between a preset voltage sum value and the maximum allowable charging voltage of the vehicle 1, and the preset voltage sum value is the sum of the current bus voltage of the power battery 200 and the second voltage value; and,

[0074] When the voltage conversion module 21 is determined to be fully open, the first switch K1 is opened.

[0075] For example, the second voltage value is 20V, and the second voltage reduction target value is min{Ubat+20V,Ubhm}, where Ubhm is the voltage value of the maximum allowable charging voltage of vehicle 1.

[0076] Specifically, during the parameter matching phase, the PDC outputs the second buck target value to the VTOG via the CAN bus. The VTOG generates a corresponding pulse signal based on the second buck target value to control the inverter 211 for voltage regulation. When the VTOG determines that the voltage value at the second terminal of the voltage conversion module 21 has reached the second buck target value, it feeds back a "fully open" signal to the PDC. The PDC then controls the first switch K1 to open and requests the VTOG to stop voltage regulation, and controls the third switch K3 to turn on. Here, "fully open" means that the voltage conversion module 21 continuously connects the positive terminal of the power battery 200 to the first switch K1 and continuously disconnects the negative terminal of the power battery 200 from the first switch K1. Specifically, as shown... Figure 1 As shown, the fully open state means that all the lower transistors T4 to T6 in the inverter 211 are kept in the open state, while at least one of the upper transistors T1 to T3 is kept in the open state.

[0077] 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 the corresponding step-down target value to the VTOG, so that the VTOG controls the voltage conversion module 21 to adjust the voltage, making the control process more unified.

[0078] In some embodiments, after the second switch is turned on, the vehicle charging control method further includes:

[0079] Send 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.

[0080] The first required current value is determined based on at least one of the current charging parameters of the power battery 200 and the current first temperature value of the first charging port 11.

[0081] For example, the current charging parameters of the power battery 200 include at least one of the current battery voltage, current SOC (State of Charge), and current battery temperature.

[0082] In this way, the charging current of the first charging pile can be allocated according to at least one of the current charging parameters of the power battery 200 and the current first temperature value, resulting in higher charging efficiency and safety.

[0083] 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 the temperature coefficient corresponding to the current first temperature value.

[0084] For example, the first demand current value is the product of the current first target current value and the first temperature coefficient.

[0085] Specifically, the BMS can determine the first charging current required by the power battery 200 based on the current charging parameters of the power battery 200, and the PDC can then determine the minimum value between the first charging current required by the power battery 200 determined by the BMS and the maximum charging current allowed by VTOG as the current first target current value.

[0086] For example, the vehicle charging system 100 can 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 can determine the first temperature coefficient corresponding to the current first temperature value based on the one-to-one correspondence.

[0087] In this way, different first temperature coefficients can be obtained according to different first temperature values, which can prevent the temperature of the first charging port 11 from being too high during the charging process, thus improving safety.

[0088] In some embodiments, after the second switch is turned on, the vehicle charging control method further includes:

[0089] Send a first demand voltage value to the first charging pile, so that the first charging pile outputs the corresponding charging voltage to the first charging port 11 based on the first demand voltage value.

[0090] The first required voltage value is determined based on the maximum permissible charging voltage of vehicle 1 and the maximum output voltage of the first charging pile. For example, the first required voltage value is the minimum value between the maximum permissible charging voltage of vehicle 1 and the maximum output voltage of the first charging pile.

[0091] In some embodiments, the vehicle charging control method further includes:

[0092] After the second charging port 12 of vehicle 1 is connected to the second charging pile, the second insulation detection voltage of the second charging port 12 is obtained; wherein, the second charging port 12 is the charging port that subsequently establishes a connection with the charging pile; and,

[0093] Based on the relationship between the second insulation detection voltage and the maximum allowable charging voltage of vehicle 1, and at least one of the charging methods of the first charging pile, the control is made to make the second charging pile charge the power battery 200 in the same charging method as the first charging pile.

[0094] The charging methods include a boost charging method that charges the power battery 200 through the boost charging circuit 20 and a direct charging method that charges the power battery 200 through the direct charging circuit 30.

[0095] Thus, the vehicle charging system 100 can support two low-voltage charging piles to charge the power battery 200 at the same time, two high-voltage charging piles to charge the power battery 200 at the same time, or one high-voltage charging pile and one low-voltage charging pile to charge the power battery 200 at the same time, which is more compatible and has a wider range of applications.

[0096] Specifically, in some embodiments, the vehicle charging system 100 further includes a CCM (Charge Control Module), which is used to control the charging circuit of charging port B and communicate with the charging pile connected to charging port B. Taking charging port B as the second charging port 12 as an example, 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 mentioned below according to the determination result.

[0097] After the second charging port 12 of vehicle 1 is connected to the second charging pile, the second insulation detection voltage of the second charging port 12 is obtained, including:

[0098] After the second charging port 12 of vehicle 1 is connected to the second charging pile, it enters the charging handshake stage in response to the second start charging command input by the user; and,

[0099] During 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.

[0100] In some embodiments, based on the relationship between the second insulation detection voltage and the maximum permissible charging voltage of the vehicle 1, and at least one of the charging methods of the first charging pile, control the second charging pile to charge the power battery 200 in the same charging method as the first charging pile, including:

[0101] When the charging mode of the first charging pile is boost charging, the control enables the second charging pile to charge the power battery 200 through the boost charging circuit 20.

[0102] When the charging mode of the first charging pile is direct charging, based on the relationship between the second insulation detection voltage and the maximum allowable charging voltage of vehicle 1 and the duration of the relationship, the control is made so that the second charging pile and the first charging pile charge the power battery 200 together through the boost charging circuit 20 or together through the direct charging circuit 30.

[0103] Furthermore, when the charging method of the first charging pile is direct charging, based on the relationship between the second insulation detection voltage and the maximum allowable charging voltage of vehicle 1, and the duration of maintaining this relationship, the system controls the second charging pile and the first charging pile to charge the power battery 200 together through the boost charging circuit 20 or together through the direct charging circuit 30, including:

[0104] When the first charging pile is charging 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 greater than or equal to the second preset duration, the control causes the second charging pile to charge the power battery 200 through the direct charging circuit 30; and,

[0105] When the charging mode of the first charging pile is 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 control causes the first charging pile to switch to charging 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.

[0106] For example, the second preset duration is 200ms.

[0107] It is easy to understand that when 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, it indicates that the second charging pile is a high-voltage charging pile. In this case, regardless of whether the first charging pile uses direct charging or boost charging, the second charging pile can charge the power battery 200 using the same charging method as the first charging pile. When the duration of the second insulation detection voltage being greater than or equal to the maximum allowable charging voltage is less than the second preset duration, it indicates that the second charging pile is a low-voltage charging pile. In this case, if the first charging pile uses direct charging, the second charging pile cannot directly charge the power battery 200 through the direct charging circuit 30. Therefore, 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 first charging pile uses boost charging, the second charging pile can directly charge the power battery 200 through the boost charging circuit 20.

[0108] In other embodiments, the CCM may also disregard the duration during which the second insulation detection voltage is greater than or equal to the maximum permissible charging voltage when determining the voltage level of the second charging station.

[0109] 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, as... Figure 1 As shown, there are two fourth switches, including fourth switch K41 and fourth switch K42. The first terminal of fourth switch K41 is electrically connected to both the boost charging circuit 20 and the direct charging circuit 30, and the second terminal of fourth switch K41 is electrically connected to the positive terminal of the second charging port 12. The first terminal of fourth switch K42 is grounded, and the second terminal of fourth switch K42 is electrically connected to the negative terminal of the second charging port 12.

[0110] Furthermore, the control enables the second charging pile to charge the power battery 200 through the boost charging circuit 20, including:

[0111] When the second charging port 12 meets the charging conditions, the fourth switch is turned on, so that the second charging pile charges the power battery 200 through the boost charging circuit 20.

[0112] The control enables the second charging pile to charge the power battery 200 through the direct charging circuit 30, including:

[0113] When the second charging port 12 meets the charging conditions, the fourth switch is turned on, so that the second charging pile charges the power battery 200 through the direct charging circuit 30.

[0114] The control switches the first charging pile to charge the power battery 200 via the boost charging circuit 20, and also enables the second charging pile to charge the power battery 200 via the boost charging circuit 20, including:

[0115] Control the first switch K1 to be turned on;

[0116] The third switch K3 is turned off, so that the first charging pile switches to charging the power battery 200 through the boost charging circuit 20;

[0117] The control voltage conversion module 21 performs voltage conversion on the battery voltage provided by the power battery 200, so that the voltage at the second terminal of the voltage conversion module 21 changes to the first step-down target value; and,

[0118] When the second charging port 12 meets the charging conditions, the fourth switch is turned on, so that the second charging pile charges the power battery 200 through the boost charging circuit 20.

[0119] 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 voltage relief threshold, and the charging message interaction is normal. For example, the preset voltage relief threshold is 60V. This ensures that the second charging pile can fully discharge residual charge before the fourth switch is turned on, thereby preventing the fourth switch from generating an electric arc when it is turned on, thus improving safety.

[0120] It should be noted that, as mentioned earlier, during the charging process of the first charging pile for the power battery 200, the PDC will output a gradually increasing step-down target value to the VTOG at a preset rate, thereby causing the voltage at the second terminal of the voltage conversion module 21 to increase from the first step-down target value to the step-down limit value. At this time, if the second charging port 12 performs parameter matching during the voltage boosting process of the voltage conversion module 21, it may cause the second charging pile to detect a voltage deviation rate of >5% at the second charging port 12 and stop charging.

[0121] In view of this, in order to improve the stability of the second charging station, in some embodiments, the vehicle charging control method further includes:

[0122] During the process of controlling the voltage conversion module 21 to convert the battery voltage provided by the power battery 200, so that the voltage at the second terminal 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 have started to establish a connection, then the control voltage conversion module 21 is used to convert the battery voltage provided by the power battery 200, so that the voltage at the second terminal of the voltage conversion module 21 remains at the current voltage; and,

[0123] When the connection of the second charging pile is completed, 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 terminal of the voltage conversion module 21 continues to increase from the current voltage to the voltage reduction limit value.

[0124] The completion of the connection of the second charging pile means that the charging circuit between the second charging pile and the power battery 200 has been established. Specifically, as follows: Figure 1 As shown, once the fourth switch is turned on, it indicates that the second charging station has completed the connection.

[0125] In some embodiments, after the fourth switch is turned on, the vehicle charging control method further includes:

[0126] Send a second required current value to the second charging pile, so that the second charging pile outputs the corresponding charging current to the second charging port based on the second required current value.

[0127] The second required current value is determined based on at least one of the current charging parameters of the power battery 200 and the current second temperature value of the second charging port 12.

[0128] In this way, the charging current of the second charging pile can be allocated according to at least one of the current charging parameters of the power battery 200 and the current second temperature value, resulting in higher charging efficiency and safety.

[0129] 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 the temperature coefficient corresponding to the current second temperature value.

[0130] For example, the second required current value is the product of the current second target current value and the second temperature coefficient.

[0131] 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 based on 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.

[0132] 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 based on the one-to-one correspondence.

[0133] In some embodiments, after the second switch K2 is turned on, the vehicle charging control method further includes:

[0134] Send a second required voltage value to the second charging pile, so that the second charging pile outputs the corresponding charging voltage to the second charging port based on the second required voltage value.

[0135] The second required voltage value is determined based on the maximum permissible charging voltage of vehicle 1 and the maximum output voltage of the second charging pile. For example, the second required voltage value is the minimum of the maximum permissible charging voltage of vehicle 1 and the maximum output voltage of the second charging pile.

[0136] Please refer to it again. Figure 1 Based on the same inventive concept, this 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). The first end of the boost charging circuit 20 and the first end of the direct charging circuit 30 are respectively electrically connected to the two charging ports. The second end of the boost charging circuit 20 and the second end of the direct charging circuit 30 are both adapted to be 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.

[0137] The control module may include the PDC, VTOG, BMS and CCM mentioned above. The control module can perform corresponding steps through at least one of PDC, VTOG, BMS and CCM. For details, please refer to the previous text.

[0138] Please refer to it again. Figure 1 Based on the same inventive concept, this application also provides a vehicle 1, which includes a power battery 200 and the vehicle charging system 100 of the above embodiments.

[0139] The vehicle charging system 100 and vehicle 1 provided in this application, by setting up 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 both high-voltage charging piles and low-voltage charging piles, thus achieving higher compatibility and wider applicability.

[0140] Based on the same inventive concept, this application also provides a computer-readable storage medium storing a computer program, which is executed by a processor to implement the steps of the vehicle charging control method of any of the above embodiments.

[0141] The computer storage medium in this application embodiment can be any combination of one or more computer-readable media. A computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. A computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of computer-readable storage media (a non-exhaustive list) include: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this document, a 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, apparatus, or device.

[0142] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. Computer-readable signal media may also be any computer-readable medium other than computer-readable storage media, capable of sending, propagating, or transmitting programs for use by or in connection with an instruction execution system, apparatus, or device.

[0143] Program code contained on a computer-readable medium may be transmitted using any suitable medium, including but not limited to wireless, wire, optical fiber, RF, etc., or any suitable combination thereof.

[0144] Computer program code for performing the operations of this invention can be written in one or more programming languages ​​or a combination thereof. Programming languages ​​include object-oriented programming languages—such as Java, Smalltalk, and C++—as well as conventional procedural programming languages—such as C or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0145] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

[0146] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A vehicle charging control method, characterized in that, The vehicle charging control method includes: After the vehicle's first charging port is connected to the first charging pile, the first insulation detection voltage of the first charging port is obtained; and Based on the relationship between the first insulation detection voltage and the vehicle's maximum allowable charging voltage, the boost charging circuit is controlled to work and the charging voltage provided by the first charging pile is boosted and converted to charge the power battery, or the direct charging circuit is controlled to work and receive the charging voltage provided by the first charging pile to directly charge the power battery. After the second charging port of the vehicle is connected to the second charging pile, the second insulation detection voltage of the second charging port is obtained; When the charging mode of the first charging pile is boost charging, the control causes 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, 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 the second preset duration, the control causes 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, 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 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.

2. The vehicle charging control method as described in claim 1, characterized in that, 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, characterized in that, 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: When the duration for which the first insulation detection voltage is greater than or equal to the maximum allowable charging voltage is 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 When the duration of the first insulation detection voltage being greater than or equal to the maximum allowable charging voltage is greater than or equal to the 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 as described in claim 1, characterized in that, The vehicle charging control method further includes: 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, characterized in that, 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. When the charging mode of the first charging pile is direct charging, based on the relationship between the second insulation detection voltage and the maximum allowable charging voltage of the vehicle and the duration of 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, characterized in that, 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 turn on; and The control voltage conversion module boosts and converts the charging voltage provided by the first charging pile to charge the power battery. The boost charging circuit includes a voltage conversion module and a first switch. The first terminal of the voltage conversion module is the second terminal of the boost charging circuit. The second terminal of the voltage conversion module 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.

7. The vehicle charging control method as described in claim 6, characterized in that, Before the control voltage conversion module boosts and converts the charging voltage provided by the first charging pile to charge the power battery, the vehicle charging control method further includes: The control voltage conversion module converts the battery voltage supplied by the power battery, causing the voltage at the second terminal of the voltage conversion module to change to a first step-down target value; and When the voltage at the second terminal of the voltage conversion module is the first step-down target value, the second switch is turned on. The vehicle charging system also 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.

8. The vehicle charging control method as described in claim 7, characterized in that, The first voltage reduction target value is the minimum value between the first preset voltage difference and the preset low voltage reference value. 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.

9. The vehicle charging control method as described in claim 8, characterized in that, The control voltage conversion module boosts the charging voltage provided by the first charging pile to charge the power battery, including: The voltage conversion module is controlled to convert the battery voltage provided by the power battery, so that the voltage at the second terminal of the voltage conversion module increases from the first voltage reduction target value to the voltage reduction limit value.

10. The vehicle charging control method as described in claim 9, characterized in that, 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.

11. The vehicle charging control method as described in claim 10, characterized in that, Before the control third switch is turned on, the vehicle charging control method further includes: When the duration for 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 first switch is controlled to be turned on; The voltage conversion module is controlled to convert the battery voltage supplied by the power battery, so that the voltage at the second terminal of the voltage conversion module changes to the second target voltage reduction value; and When the voltage conversion module is determined to be in the fully open state, the first switch is controlled to open.

12. The vehicle charging control method as described in claim 11, characterized in that, 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, wherein the preset voltage sum value is the sum of the current bus voltage value of the power battery and the second voltage value.

13. The vehicle charging control method as described in claim 10, 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 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.

14. The vehicle charging control method as described in claim 13, characterized in that, The control enables the second charging pile to charge the power battery through the direct charging circuit, including: When the second charging port meets the charging conditions, the fourth switch is turned on, so that the second charging pile charges the power battery through the direct charging circuit.

15. The vehicle charging control method as described in claim 13, characterized in that, 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 conversion module is controlled to convert the battery voltage supplied by the power battery, so that the voltage at the second terminal of the voltage conversion module changes to the first voltage reduction target value; and When the second charging port meets the charging conditions, the fourth switch is turned on, so that the second charging pile charges the power battery through the boost charging circuit.

16. The vehicle charging control method as described in claim 9, characterized in that, The vehicle charging control method further includes: During the process of controlling the voltage conversion module to convert the battery voltage provided by the power battery, so that the voltage at the second terminal 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 have started to establish a connection, then the voltage conversion module is controlled to convert the battery voltage provided by the power battery, so that the voltage at the second terminal of the voltage conversion module remains at the current voltage; and When the connection of the second charging pile is completed, the voltage conversion module is controlled to convert the battery voltage provided by the power battery, so that the voltage at the second terminal of the voltage conversion module continues to increase from the current voltage to the step-down limit value.

17. The vehicle charging control method as described in claim 10, characterized in that, The vehicle charging control method further includes: During the process of charging 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 During 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.

18. The vehicle charging control method as described in claim 17, 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.

19. The vehicle charging control method as described in claim 17, characterized in that, 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.

20. The vehicle charging control method as described in claim 9, characterized in that, 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.

21. The vehicle charging control method as described in claim 20, characterized in that, 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.

22. The vehicle charging control method as described in claim 21, characterized in that, 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.

23. The vehicle charging control method as described in claim 7 or 10, characterized in that, 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.

24. The vehicle charging control method as described in claim 23, characterized in that, 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.

25. The vehicle charging control method according to any one of claims 13-15, characterized in that, 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.

26. The vehicle charging control method as described in claim 25, characterized in that, 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.

27. The vehicle charging control method as described in claim 26, 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.

28. The vehicle charging control method according to any one of claims 13-15, characterized in that, 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.

29. The vehicle charging control method as described in claim 28, characterized in that, 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.

30. A vehicle charging system, characterized in that, The device includes two charging ports, a boost charging circuit, a direct charging circuit, and a control module. 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 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 1-29.

31. A vehicle, characterized in that, This includes a power battery and a vehicle charging system as described in claim 30.

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