Charging control method, charging system, vehicle

Abstract

The application discloses a charging control method, a charging system and a vehicle, wherein the vehicle comprises a charging system of a power battery, the charging system comprises a first charging circuit and a second charging circuit, and the charging control method specifically comprises the following steps: when it is determined that the first charging circuit and the second charging circuit simultaneously charge the power battery, then the maximum allowable charging current of the power battery is used to determine a first target charging current of the first charging circuit and a second charging current of the second charging circuit, and the corresponding charging circuit is controlled according to each target charging circuit, so that the power battery is charged. Therefore, the charging control method can improve the charging efficiency of the power battery, reduce the charging time, be compatible with the national standard direct-current charging pile on the market, ensure that the vehicle can be charged, and improve the user experience.

Description

TECHNICAL FIELD

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

[0002] With the rapid development of new energy vehicles, the proportion of new energy vehicles in the automobile market is increasing year by year, but the charging rate has been a problem that new energy vehicle manufacturers are eager to solve.

[0003] To solve this problem, the related technology mainly adopts high-power direct current charging technology or battery replacement technology. However, the battery replacement technology has high cost, and the high-power direct current charging technology has not been popularized due to the high-voltage platform high-power charging facility, so that the charging speed of the vehicle with high-power direct current charging technology is still limited by the output voltage and power of the direct current charging device. SUMMARY

[0004] The present application aims to at least solve one of the technical problems in the related art. To this end, one object of the present application is to provide a charging control method, which simultaneously charges the power battery through two charging circuits, and controls the corresponding charging circuit according to different target charging currents, thereby improving the charging efficiency of the power battery, reducing the charging time, and being compatible with the national standard direct current charging pile on the market, ensuring that the vehicle can complete charging and improving user experience.

[0005] A second object of the present application is to provide a charging system.

[0006] A third object of the present application is to provide a vehicle.

[0007] To achieve the above object, the first aspect of the present application provides a charging control method, which is applied to a vehicle, the vehicle comprising a power battery and a charging system for charging the power battery, the charging system comprising a first charging circuit and a second charging circuit, the first charging circuit being provided with a voltage conversion circuit configured to charge the power battery by boosting, and the second charging circuit being configured to charge the power battery by direct connection, the method comprising: determining the maximum allowable charging current of the power battery when the first charging circuit and the second charging circuit simultaneously charge the power battery; distributing the first target charging current of the first charging circuit and the second target charging current of the second charging circuit according to the maximum allowable charging current of the power battery; controlling the first charging circuit according to the first target charging current, and controlling the second charging circuit according to the second target charging current.

[0008] The charging control method of the embodiment of the application is applied to a vehicle, the vehicle including a charging system of a power battery, the charging system including a first charging circuit and a second charging circuit, the first charging circuit being capable of charging the power battery through voltage conversion, and the second charging circuit being capable of directly charging the power battery, and the charging control method specifically includes: when it is determined that the first charging circuit and the second charging circuit simultaneously charge the power battery, determining a first target charging current of the first charging circuit and a second target charging current of the second charging circuit through a maximum allowable charging current of the power battery, and controlling the respective charging circuits according to the target charging currents to charge the power battery. Thus, the charging control method of the embodiment can improve the charging efficiency of the power battery, reduce the charging time, and be compatible with the national standard direct-current charging pile on the market, so as to ensure that the vehicle can be charged and improve the user experience.

[0009] In some embodiments of the application, the allocation of the first target charging current of the first charging circuit and the second target charging current of the second charging circuit according to the maximum allowable charging current of the power battery includes: when the maximum allowable charging current of the power battery is greater than a first preset current threshold and less than a second preset current threshold, taking the smaller one of a first current value and a third preset current threshold as the second target charging current, and taking the difference between the maximum allowable charging current of the power battery and the actual charging current of the second charging circuit as the first target charging current, wherein the first current value is the difference between the maximum allowable charging current of the power battery and a fourth preset current threshold, the third preset current threshold is greater than the fourth preset current threshold, and the sum of the third preset current threshold and the fourth preset current threshold is equal to the second preset current threshold; and when the maximum allowable charging current of the power battery is greater than or equal to the second preset current threshold, taking the third preset current threshold as the second target charging current, and taking the difference between the maximum allowable charging current of the power battery and the actual charging current of the second charging circuit as the first target charging current.

[0010] In some embodiments of the present application, the first target charging current of the first charging circuit and the second target charging current of the second charging circuit are allocated according to the maximum allowed charging current of the power battery, and the allocation further comprises: when the maximum allowed charging current of the power battery is less than or equal to a first preset current threshold and the SOC (State of Charge) of the power battery is less than or equal to a first preset value, half of the maximum allowed charging current of the power battery is taken as the second target charging current, and the difference between the maximum allowed charging current of the power battery and the actual charging current of the second charging circuit is taken as the first target charging current; when the maximum allowed charging current of the power battery is less than or equal to the first preset current threshold and the SOC of the power battery is greater than the first preset value, the maximum allowed charging current of the power battery is taken as the second target charging current, and the first target charging current is set to zero.

[0011] In some embodiments of the present application, the vehicle further comprises a motor and a motor inverter, and at least one phase winding of the motor and at least one corresponding phase bridge arm of the three-phase bridge arm of the motor inverter are multiplexed to form the voltage conversion circuit.

[0012] In some embodiments of the present application, when the voltage conversion circuit comprises the three-phase winding of the motor and the three-phase bridge arm, one end of a first phase winding, one end of a second phase winding and one end of a third phase winding in the three-phase winding are connected together to form a neutral point, the other end of the first phase winding is connected to an intermediate node of a first phase bridge arm in the three-phase bridge arm, the other end of the second phase winding is connected to an intermediate node of a second phase bridge arm in the three-phase bridge arm, the other end of the third phase winding is connected to an intermediate node of a third phase bridge arm in the three-phase bridge arm, and a first capacitor is connected in parallel between the positive terminal and the negative terminal of the bus of the three-phase bridge arm, wherein the first charging circuit is controlled according to the first target charging current, which comprises: the three-phase bridge arm is controlled in a phase error manner so that the first charging circuit charges the power battery at the first target charging current.

[0013] In some embodiments of the present application, when the first charging circuit charges the power battery alone, the method further comprises: controlling the voltage conversion circuit according to the maximum allowed charging current of the power battery so that the first charging circuit boosts the power battery.

[0014] In some embodiments of the present application, before the first charging circuit charges the power battery alone, the method further comprises: controlling the voltage conversion circuit to step-down convert the voltage provided by the power battery so that the voltage of the first charging port connected to the first charging circuit is adapted to the output voltage of an external charging device.

[0015] In some embodiments of the present application, when the second charging circuit charges the power battery alone, the method further comprises: acquiring a maximum output voltage of an external charging device connected to the second charging circuit; and when the maximum output voltage is greater than or equal to a preset voltage threshold, controlling the second charging circuit to perform direct charging on the power battery.

[0016] To achieve the above object, the second aspect of the present application provides a charging system, comprising: a first charging circuit, wherein a voltage conversion circuit is arranged in the first charging circuit and configured to perform step-up charging on a power battery; a second charging circuit, wherein the second charging circuit is configured to perform direct charging on the power battery; and a controller, configured to, when the first charging circuit and the second charging circuit charge the power battery simultaneously, determine a maximum allowable charging current of the power battery, and distribute a first target charging current of the first charging circuit and a second target charging current of the second charging circuit according to the maximum allowable charging current of the power battery, and control the first charging circuit according to the first target charging current and control the second charging circuit according to the second target charging current.

[0017] The charging system of the embodiments of the present application comprises a first charging circuit, a second charging circuit and a controller, wherein the first charging circuit can perform step-up charging on a power battery, the second charging circuit can perform direct charging on the power battery, and when the first charging circuit and the second charging circuit charge the power battery simultaneously, the controller can distribute target charging currents to the first charging circuit and the second charging circuit according to a maximum allowable charging current of the power battery, so that the first charging circuit and the second charging circuit can charge the power battery according to the corresponding target charging currents, thereby improving the charging efficiency of the power battery, reducing the charging time, being compatible with the national standard direct current charging pile on the market, ensuring that the vehicle can complete charging, and improving the user experience.

[0018] In some embodiments of the present application, the first charging circuit and the second charging circuit share the same controller; or the controller comprises a first control unit and a second control unit, the first control unit is configured to control electronic devices in the first charging circuit to achieve step-up charging, and the second control unit is configured to control electronic devices in the second charging circuit to achieve direct charging.

[0019] To achieve the above object, the third aspect of the present application provides a vehicle, comprising the charging system in the above embodiments.

[0020] The vehicle of the embodiment of the application can charge the power battery according to the corresponding target charging current through the charging system in the above embodiment, thereby improving the charging efficiency of the power battery, reducing the charging time length, and being compatible with the national standard direct current charging pile on the market, so that the vehicle can complete charging and the user experience is improved.

[0021] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following description and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structural schematic diagram of a vehicle according to an embodiment of the application;

[0023] Figure 2 is a flowchart of a charging control method according to an embodiment of the application;

[0024] Figure 3 is a flowchart of a charging control method according to another embodiment of the application;

[0025] Figure 4 is a flowchart of a charging control method according to another embodiment of the application;

[0026] Figure 5 is a structural schematic diagram of a vehicle according to another embodiment of the application;

[0027] Figure 6 is a structural schematic diagram of a vehicle according to another embodiment of the application;

[0028] Figure 7 is a structural schematic diagram of a vehicle according to another embodiment of the application;

[0029] Figure 8A is a structural schematic diagram of a vehicle according to another embodiment of the application;

[0030] Figure 8B is a structural schematic diagram of a vehicle according to another embodiment of the application;

[0031] Figure 9 is a structural schematic diagram of a vehicle according to another embodiment of the application;

[0032] Figure 10 is a structural schematic diagram of a vehicle according to another embodiment of the application;

[0033] Figure 11 is a structural schematic diagram of a vehicle according to another embodiment of the application;

[0034] Figure 12 is a flowchart of a charging control method of a vehicle according to another embodiment of the application;

[0035] Figure 13 This is a structural block diagram of the charging controller of a vehicle according to an embodiment of the present invention;

[0036] Figure 14 This is a structural block diagram of a charging system according to an embodiment of the present invention;

[0037] Figure 15 This is a structural block diagram of a vehicle according to an embodiment of the present invention. Detailed Implementation

[0038] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0039] The charging control method, charging system, and vehicle of the present invention are described below with reference to the accompanying drawings.

[0040] See Figure 1 In this embodiment, the vehicle 100 includes a power battery 20 and a charging system 10 for charging the power battery 20. The charging system 10 includes a first charging circuit 11 and a second charging circuit 12. The first charging circuit 11 is provided with a voltage conversion circuit 111 and is configured to perform boost charging of the power battery 20. The second charging circuit 12 is configured to perform direct charging of the power battery 20.

[0041] It should be noted that, Figure 1 Only the power battery 20, charging system 10, first charging port 1, and second charging port 2 included in vehicle 100 are shown. Other equipment and devices of the vehicle are not specifically limited in this embodiment, and therefore are not included. Figure 1 The illustration is shown below. Additionally, the vehicle 100 in this embodiment can be either a pure electric vehicle or a hybrid electric vehicle.

[0042] Specifically, by Figure 1 It is known that the vehicle 100 is equipped with two charging ports, which can charge the power battery 20 simultaneously, thereby greatly improving the charging efficiency of the power battery 20. In addition, a voltage conversion circuit 111 is set in the first charging circuit 11, while the second charging circuit 12 is directly connected to the power battery 20, so as to adapt to the voltage of various power supply devices connected to the charging port and improve the charging compatibility of the vehicle charging system.

[0043] Figure 2 This is a flowchart of a charging control method according to an embodiment of the present invention.

[0044] likeFigure 2 As shown, the application proposes a charging control method, which comprises the following steps:

[0045] S10, when the first charging circuit and the second charging circuit simultaneously charge the power battery, determining the maximum allowable charging current of the power battery.

[0046] Specifically, the embodiment can determine whether the first charging circuit 11 and the second charging circuit 12 simultaneously charge the power battery 20 in various ways, including but not limited to detecting whether both charging ports are connected with the charging gun through the BMS (Battery Management System, power battery management system), or detecting the voltage of both charging ports. When both charging ports are connected with the charging gun or the voltage of both charging ports is greater than a preset value, it can be determined that the first charging circuit 11 and the second charging circuit 12 are simultaneously charging the power battery 20 at this time.

[0047] It should be noted that when the first charging circuit 11 and the second charging circuit 12 simultaneously charge the power battery 20, since the first charging circuit 11 and the second charging circuit 12 are independent of each other, the charging current can be superimposed, thereby improving the charging efficiency. In order to prevent energy waste, when the first charging circuit 11 and the second charging circuit 12 simultaneously charge the power battery 20, the maximum allowable charging current of the power battery can be determined first, and then the charging current of the first charging circuit 11 and the second charging circuit 12 is distributed according to the maximum allowable charging current. Since the voltage conversion circuit 111 is provided in the first charging circuit 11, and when the voltage conversion circuit 11 performs voltage conversion, a part of energy will inevitably be lost, so the current is adaptively distributed, for example, at the end of the power battery charging, only the second charging circuit 12 is used to charge it, thereby reducing energy loss.

[0048] S20, distributing the first target charging current of the first charging circuit and the second target charging current of the second charging circuit according to the maximum allowable charging current of the power battery.

[0049] Specifically, since the functions of the first charging circuit 11 and the second charging circuit 12 are not the same, and the first charging circuit 11 is provided with the voltage conversion circuit 111, there will be a loss problem in the voltage conversion process, therefore, in order to improve the charging efficiency of the power battery 20, the current distribution of the first charging circuit 11 and the second charging circuit 12 is required. On the other hand, the power battery 20 is constantly changing in the charging process, so the target charging current of the first charging circuit 11 and the second charging circuit 12 needs to be adjusted and distributed according to the power of the power battery 20. For example, since the second charging circuit 12 is directly connected to the power battery 20, the loss is small, so in the last stage of charging the power battery 20, only the second charging circuit 12 can be used to charge it, because at this time, if the first charging circuit 11 provided with the voltage conversion circuit 111 is also used for charging, due to the loss of voltage conversion, it may not be able to effectively complete the charging of the power battery 20.

[0050] S30, control the first charging circuit according to the first target charging current, and control the second charging circuit according to the second target charging current.

[0051] Specifically, after determining the first target charging current and the second target charging current, the corresponding charging circuit can be controlled to complete the charging of the power battery 20. It should be noted that in this embodiment, the target charging current of the first charging circuit 11 and the second charging circuit 12 can be continuously adjusted and controlled before the power battery 20 is fully charged.

[0052] In some embodiments of the present application, as shown in Figure 3 The first target charging current of the first charging circuit and the second target charging current of the second charging circuit are distributed according to the maximum allowable charging current of the power battery, comprising:

[0053] S301, when the maximum allowable charging current of the power battery is greater than the first preset current threshold and less than the second preset current threshold, the smaller value between the first current value and the third preset current threshold is taken as the second target charging current, and the difference between the maximum allowable charging current of the power battery and the actual charging current of the second charging circuit is taken as the first target charging current, wherein the first current value is the difference between the maximum allowable charging current of the power battery and the fourth preset current threshold, the third preset current threshold is greater than the fourth preset current threshold, and the sum of the third preset current threshold and the fourth preset current threshold is equal to the second preset current threshold.

[0054] Specifically, in this embodiment, after the maximum allowable charging current of the power battery is obtained, the size of the maximum allowable charging current of the power battery can be determined. It can be understood that the maximum allowable charging current of the power battery is different in different situations, such as different remaining power. For example, when the remaining power of the power battery is greater than 50%, the maximum allowable charging current thereof is a smaller current value, and when the remaining power of the power battery is less than 50%, the maximum allowable charging current thereof is a larger current value. The specific value can be determined according to the specification parameters of the power battery.

[0055] The embodiment is described by taking a vehicle with a double-gun charging port as an example. First, according to the charging circuit design, the first preset current threshold is 60A, the second preset current threshold is 280A, the third preset current threshold is 250A, and the fourth preset current threshold is 30A. Then, if the maximum allowable charging current I of the power battery is greater than 60A and less than 280A, the first current value is compared with 250A in size, and the smaller value is taken as the second target charging current I2. The first current value is the current value obtained by subtracting 30A from the maximum allowable charging current of the power battery. After the second target charging current I2 is determined, the second charging circuit 12 is controlled to work at the second target charging current I2, and then the actual charging current of the second charging circuit 12 is obtained. Due to circuit loss and other reasons, the actual charging current of the second charging circuit 12 is not necessarily the same as the second target charging current I2. Therefore, in this embodiment, when the first target charging current I1 is determined, the maximum allowable charging current I of the power battery is subtracted from the actual charging current of the second charging circuit, so that the first target charging current I1 and the second target charging current I2 are more close to the maximum allowable charging current I of the power battery after superposition.

[0056] It should be noted that although the second preset current threshold in this embodiment is determined according to different vehicle models or different specifications of power batteries, the vehicle model and the power battery specification are also designed to match the model specification of the current charging pile. That is, the second preset current threshold in this embodiment can be adjusted according to the upgrade of the charging pile, power battery and other equipment. The second preset current threshold is kept equal to the maximum output current of the current charging pile.

[0057] S302, when the maximum allowable charging current of the power battery is greater than or equal to the second preset current threshold, the third preset current threshold is taken as the second target charging current, and the difference between the maximum allowable charging current of the power battery and the actual charging current of the second charging circuit is taken as the first target charging current.

[0058] Specifically, if it is determined that the maximum allowable charging current I of the power battery is greater than or equal to the second preset current threshold 280A, the third preset current threshold 250A is directly taken as the second target charging current I2, the second charging circuit 12 is controlled according to the second target charging current I2, then the actual charging current of the second charging circuit is obtained, and the difference between the maximum allowable charging current of the power battery and the actual charging current of the second charging circuit is taken as the first target charging current I1, and the first charging circuit 11 is controlled according to the first target charging current I1.

[0059] In another embodiment of the present application, as shown in Figure 4 the first target charging current of the first charging circuit and the second target charging current of the second charging circuit according to the maximum allowable charging current of the power battery further comprises:

[0060] S401, when the maximum allowable charging current of the power battery is less than or equal to the first preset current threshold and the SOC of the power battery is less than or equal to the first preset value, half of the maximum allowable charging current of the power battery is taken as the second target charging current, and the difference between the maximum allowable charging current of the power battery and the actual charging current of the second charging circuit is taken as the first target charging current.

[0061] Specifically, in this embodiment, after the maximum allowable charging current of the power battery is determined, the maximum allowable charging current is compared with the first preset current threshold, and the SOC of the power battery is also obtained and compared with the first preset value. It can be understood that the first preset current threshold and the first preset value in this embodiment can be determined and adjusted according to the experimental data of specific vehicle models, and can also be fixedly stored in the corresponding medium and called when needed.

[0062] When the maximum allowable charging current of the power battery is less than or equal to the first preset current threshold and the SOC of the power battery is less than or equal to the first preset value, half of the maximum allowable charging current of the power battery is taken as the second target charging current, then the second charging circuit is controlled according to the second target charging current, and the actual charging current of the second charging circuit is obtained, then the difference between the maximum allowable charging current of the power battery and the actual charging current of the second charging circuit is taken as the first target charging current, and the first charging circuit is controlled according to the first target charging current.

[0063] Optionally, the first preset current threshold in this embodiment can be 60A, and the first preset value can be 95%.

[0064] S402, when the maximum allowed charging current of the power battery is less than or equal to the first preset current threshold and the SOC of the power battery is greater than the first preset value, the maximum allowed charging current of the power battery is taken as the second target charging current, and the first target charging current is set to zero.

[0065] Specifically, when the maximum allowed charging current of the power battery is less than or equal to the first preset current threshold and the SOC of the power battery is greater than the first preset value, the maximum allowed charging current of the power battery can be directly taken as the second target charging current, that is, the second charging loop is controlled according to the maximum allowed charging current of the power battery, and the first target charging voltage of the first charging loop is set to zero. It should be noted that when the SOC of the power battery is high, such as greater than 95%, it means that the power battery is about to be fully charged, at this time, the maximum allowed charging current of the power battery will gradually decrease, at this time, a single charging loop can meet the demand, so the direct current charging circuit with high charging efficiency, that is, the second charging loop, can be reserved to charge the power battery.

[0066] In some embodiments, the first target charging current is less than or equal to the second target charging current.

[0067] Specifically, according to Figure 1 It can be known that the voltage conversion circuit 111 is arranged in the first charging loop 11, so the first charging port 1 connected with the first charging loop 11 needs to be connected with the power battery 20 through the voltage conversion circuit 111, and the voltage conversion circuit 111 will cause more or less energy loss in the working process. The second charging loop 12 is directly connected with the power battery 20, that is, the second charging port 2 is directly connected with the power battery 20 through the second charging loop 12 without voltage conversion, so the charging efficiency of the first charging loop 11 is lower than that of the second charging loop 12. Therefore, in order to improve the charging efficiency of the power battery 20, more current can be allocated to the second charging loop 12, that is, the second target charging current is greater than or equal to the first target charging current, so as to quickly complete the charging of the power battery 20, reduce the charging time and improve the user experience.

[0068] In some embodiments of the present application, the vehicle further comprises a motor and a motor inverter, as shown in Figure 5 The at least one phase winding of the motor and the corresponding at least one phase bridge arm of the three-phase bridge arm of the motor inverter constitute the voltage conversion circuit 111.

[0069] It should be noted that the vehicle in the present embodiment comprises a motor and a motor inverter, and the motor inverter generally comprises at least three phase bridge arms, as shown in Figure 5In this embodiment, at least one phase winding in the motor winding and at least one corresponding phase bridge arm in the motor inverter are used as the boost circuit 111, so as to realize the multiplexing of the motor winding and the motor inverter, and effectively reduce the design cost of the vehicle.

[0070] Specifically, taking the three-phase winding in the motor winding and the three-phase bridge arm in the motor inverter as an example, the conduction and closing of each switch tube in the three-phase bridge arm are controlled to control the charging and discharging of the motor winding, so as to achieve the boost effect. More specifically, the switch tubes corresponding to the lower bridge arm in the three-phase bridge arm can be controlled by the same pulse signal, and the switch tubes corresponding to the upper bridge arm in the three-phase bridge arm can also be controlled by the same pulse signal, and the pulse signals between the upper bridge arm and the lower bridge arm can be opposite, that is, when the pulse signal of the lower bridge arm is high, the pulse signal corresponding to the upper bridge arm is low, and when the pulse signal of the lower bridge arm is low, the pulse signal corresponding to the upper bridge arm is high. When the switch tube in the lower bridge arm is turned on and the switch tube in the upper bridge arm is turned off, the external power supply connected to the first charging port 1 can charge the motor winding, and in the next pulse signal, the switch tube in the upper bridge arm is turned on and the switch tube in the lower bridge arm is turned off, at this time the external power supply and the power supply in the motor winding can charge the power battery 20 at the same time, thereby completing the boost charging of the power battery 20.

[0071] In this embodiment, as shown in Figure 5 When the voltage conversion circuit 111 includes the three-phase winding and the three-phase bridge arm of the motor, one end of the first phase winding L1, one end of the second phase winding L2 and one end of the third phase winding L3 are connected together to form a neutral point P, the other end of the first phase winding L1 is connected to the intermediate node of the first phase bridge arm in the three-phase bridge arm, the other end of the second phase winding L2 is connected to the intermediate node of the second phase bridge arm in the three-phase bridge arm, and the other end of the third phase winding L3 is connected to the intermediate node of the third phase bridge arm in the three-phase bridge arm, and the positive terminal and the negative terminal of the bus of the three-phase bridge arm are connected in parallel with the first capacitor C1. According to the first target charging current, the first charging circuit 11 is controlled, including: the three-phase bridge arm is controlled in a wrong phase, so that the first charging circuit 11 charges the power battery 20 according to the first target charging current.

[0072] Specifically, referring to Figure 5 In this embodiment, the positive terminal of the first charging port 1 is connected to the motor winding through the neutral point P, and then connected to the positive terminal of the bus of the three-phase bridge arm through the upper bridge arm of the three-phase bridge arm, and the first charging port 1 is connected to the lower bridge arm of the three-phase bridge arm and used as the negative terminal of the bus of the three-phase bridge arm, and the first capacitor C1 is connected in parallel between the positive terminal and the negative terminal of the bus of the three-phase bridge arm, which can prevent overcharging and reduce the influence of instantaneous voltage on the power battery and the switch tube.

[0073] In the process of charging the power battery 20 through the first charging circuit 11 with the first target charging current, the inductance decreases when the inductors are connected in parallel. However, the process of charging the three-phase windings is very important in the process of motor boost charging. The decrease of inductance will lead to the decrease of charging energy, and further lead to the failure of boost charging. Therefore, the three-phase bridge arms of the motor are controlled alternately by a certain angle (preferably 120°) in this embodiment to avoid the parallel connection between the windings, thereby improving the charging success rate of the power battery. In addition, it can be known through experimental analysis that the ripple current at the charging port will also decrease when the three-phase bridge arms are controlled alternately for boost charging, thereby realizing the function of stabilizing the charging current to a certain extent.

[0074] In addition, it should be noted that the participants Figure 6 It can be known that the first charging circuit 11 further includes a first contactor K1, a second capacitor C2 and a second contactor K2. One end of the first contactor K1 is connected to one end of the second capacitor C2. The other end of the first contactor K1 is connected to the neutral point P through the first current sensor A1. One end of the second capacitor C2 is connected to the positive electrode of the first charging port 1. The other end of the second capacitor C2 is connected to the negative electrode of the first charging port 1 through the second contactor K2.

[0075] Specifically, in this embodiment, in order to improve the control of the charging process, the first contactor K1 and the second contactor K2 are provided, and the second capacitor C2 is provided between the positive electrode and the negative electrode of the first charging port 1. The second capacitor C2 can filter the external power input by the first charging port 1. The first contactor K1 is provided between the positive electrode of the first charging port 1 and the neutral point P. The second contactor K2 is provided between the negative electrode of the first charging port 1 and the second capacitor C2. In this embodiment, after the external charging gun is connected to the first charging circuit 11 through the first charging port 1 and it is confirmed that the charging gun is correctly connected to the first charging port 1, the first contactor K1 and the second contactor K2 are controlled to be closed, so that the external power can charge the power battery 20 through the first charging circuit 11. It should be noted that the first current sensor A1 in this embodiment can detect the actual charging current in the first charging circuit 11.

[0076] The second charging circuit 12 includes a third contactor K3, a fourth contactor K4 and a second current sensor A2. One end of the third contactor K3 is connected to the positive electrode of the second charging port 2. The other end of the third contactor K3 is connected to the positive electrode of the power battery 20 through the second current sensor A2. One end of the fourth contactor K4 is connected to the negative electrode of the second charging port 2. The other end of the fourth contactor K4 is connected to the negative electrode of the power battery 20 after being connected to the negative electrode of the voltage conversion circuit 111.

[0077] Specifically, the second charging circuit 12 in the embodiment is a direct current charging circuit, and after the external power supply is connected to the charging system of the vehicle through the second charging port 2, the external power supply can directly charge the power battery 20. In the embodiment, a contactor is arranged in each of the positive electrode and the negative electrode of the second charging circuit 12, so that the charging process of the second charging port 2 can be more conveniently controlled. After the external power supply is connected to the second charging port 2, the voltage of the external power supply can be determined first, and when it is determined that the external power supply can directly charge the power battery 20, the third contactor K3 and the fourth contactor K4 are controlled to be closed, so that the external power supply can directly charge the power battery 20.

[0078] It can be understood that one of the third contactor K3 and the fourth contactor K4 in the embodiment can be in a closed state at all times, or when one of the third contactor K3 and the fourth contactor K4 fails and is stuck, the state of the other one is controlled to control whether the external power supply charges the power battery 20, so as to improve fault tolerance. Of course, when the third contactor K3 and the fourth contactor K4 are not faulty, the third contactor K3 and the fourth contactor K4 can also be controlled at the same time. It should be noted that the second current sensor A2 in the embodiment can detect the actual charging current in the second charging circuit 12.

[0079] In some embodiments of the application, as shown in Figure 1 and Figure 7 , the output end of the first charging circuit 11 and the output end of the second charging circuit 12 are connected to form a bus end, and the bus end is connected with the power battery 20. The bus end includes a positive bus end and a negative bus end, the positive bus end and the positive end of the power battery 20 are provided with a battery positive contactor K+ and a first pre-charging unit 13, the first pre-charging unit 13 is connected in parallel with the battery positive contactor K+, and the negative bus end and the negative end of the power battery are provided with a battery negative contactor K-.

[0080] In the embodiment, the first pre-charging unit 13 is arranged in parallel with the battery positive contactor K+, and by arranging the first pre-charging unit 13, the impact of the instantaneous high voltage generated when the main loop of the power battery 20 is connected on the power battery 20 can be avoided, and damage to the power battery 20 can be avoided, so that the service life of the power battery 20 can be improved. In the embodiment, when the power battery 20 is charged by using the first charging circuit 11 and the second charging circuit 12, the pre-charging can be completed by using the first pre-charging unit 13 first, and then normal charging is performed after the pre-charging is completed.

[0081] It can be understood that the first pre-charging unit 13 in the embodiment can be connected in parallel with any one of the battery positive contactor K+ or the battery negative contactor K-, and in the embodiment, as shown in Figure 7 , the first pre-charging unit 13 is connected in parallel with the battery positive contactor K+.

[0082] Specifically, the first pre-charging unit 13 includes a resistor R1 and a contactor KR1 in series, that is, when the power battery 20 is charged by using the first charging circuit 11 and / or the second charging circuit 12, the contactor KR1 and the battery negative contactor K- can be controlled to be closed first to form a charging circuit, and specifically, the battery negative contactor K- can be controlled to be closed first, and then the contactor KR1 can be controlled to be closed, after the pre-charging is completed, the battery positive contactor K+ can be controlled to be closed, and the contactor KR1 can be controlled to be disconnected, so as to charge the power battery 20.

[0083] In some embodiments, as shown in Figure 8A , the vehicle 100 further includes a controller 14, and the first charging circuit 11 and the second charging circuit 12 share one controller 14.

[0084] Specifically, the control unit 14 in the embodiment can be an integrated direct-current charging power on-board controller, can be one or more controllers, or can be a battery management system BMS on the vehicle 100, and the control unit 14 should include two groups of independent direct-current charging control guide circuits, and the control unit 14 can perform CAN (Controller Area Network) signal interaction with the charging pile through a charging sub-network to complete the control of the first charging circuit 11 and the second charging circuit 12 in each stage of direct-current charging. In some embodiments, the control unit 14 can be a power battery manager, and if it is other controllers, it can be set to interact with the power battery manager, such as a charging gun connection signal, a charging confirmation signal, a high-voltage main loop power-on and power-off request, an insulation detection command request, etc. In addition, the power battery manager can monitor the power battery cell state during direct-current charging, including but not limited to cell single-body voltage, temperature, maximum allowable charging current, and when the power battery charging condition is not met, the control unit 14 is requested to terminate the direct-current charging control.

[0085] In another embodiment, as shown in Figure 8B , the vehicle 100 further includes a first control unit 141 and a second control unit 142, the first control unit 141 is used to control the electrical devices in the first charging circuit 11 to realize the boost charging, and the second control unit 142 is used to control the electrical devices in the second charging circuit 12 to realize the direct connection charging.

[0086] Specifically, referring to Figure 8BIn this embodiment, the vehicle 100 includes two control units: a first control unit 141 for controlling the first charging circuit 11 and a second control unit 142 for controlling the second charging circuit 12. The first control unit 141 is connected to both the first charging port 1 and the first charging circuit 11, and can control the first charging circuit 11 according to the output voltage of the first charging port 1 to ensure that the first charging circuit 11 can respond to the output voltage of the first charging port 1 in a timely manner to charge the power battery 20. The second control unit 142 is connected to both the second charging port 2 and the second charging circuit 12, and can control the second charging circuit 12 according to the output voltage of the second charging port 2 to ensure that the second charging circuit 12 can respond to the output voltage of the second charging port 2 in a timely manner to charge the power battery 20.

[0087] In other embodiments, such as Figure 9 As shown, the voltage conversion circuit 111 in this embodiment may include a first inductor L1, a first switch T1, a second switch T2 and a third capacitor C3. The first switch T1 and the second switch T2 are connected in series and have a first node P1. The first node P1 is connected to the first inductor L1. The third capacitor C3 is connected in parallel with the first switch T1 and the second switch T2 connected in series.

[0088] Specifically, see Figure 9 In this embodiment, the boost circuit 111 includes a first inductor L1, a first switch T1, a second switch T2, and a third capacitor C3. The positive terminal of the first charging port 1 is connected to one end of the first inductor L1, and the other end of the first inductor L1 is connected to the first node P1. The first node P1 is determined by the first switch T1 and the second switch T2. Specifically, the first switch T1 and the second switch T2 are connected in series, and the two ends that directly connect the first switch T1 and the second switch T2 have the first node P1. The other two ends of the first switch T1 and the second switch T2 are connected through the third capacitor C3.

[0089] Specifically, by controlling the control signals of the first switch T1 and the second switch T2, the first switch T1 and the second switch T2 are alternately turned on. After an external power source is connected to the first charging port 1, the second switch T2 is turned on first. The external power source passes through the first inductor L1 and then through the second switch T2 to form a circuit, thus charging the first inductor L1. After the first inductor L1 is fully charged, the first switch T1 is turned on while the second switch T2 is turned off, allowing the external power source and the power source on the first inductor L1 to simultaneously pass through the first switch T1 to boost the voltage of the power battery 20.

[0090] When the first charging port 1 is connected to the external power supply, if the voltage of the external power supply is high enough, the first switch tube T1 and the second switch tube T2 can be controlled, and the external power supply can be directly connected to the power battery 20 through the first inductor L1 and the diode in the switch tube T1 for charging.

[0091] In some embodiments of the application, when the power battery is charged by the first charging circuit alone, the method further comprises: controlling the voltage conversion circuit according to the maximum allowed charging current of the power battery, so that the first charging circuit charges the power battery by boosting.

[0092] Specifically, referring to Figure 10 When the power battery 20 is charged by the first charging circuit 11, in the first time, the switch tube T2, the switch tube T4 and the switch tube T6 are turned on, and the switch tube T1, the switch tube T3 and the switch tube T5 are turned off. The external power supply flows out from the positive electrode of the first charging port 1, flows to the switch tube T2, the switch tube T4 and the switch tube T6 through the motor winding, and then flows back to the negative electrode of the first charging port 1, thereby charging the inductor in the motor winding. After completing the charging of the motor winding, it enters the second time, as shown in Figure 11 In the second time, the switch tube T2, the switch tube T4 and the switch tube T6 are turned off, and the switch tube T1, the switch tube T3 and the switch tube T5 are turned on, so that the external power supply and the power supply on the motor winding can charge the power battery 20, thereby completing the boost charging.

[0093] In this embodiment, before the power battery is charged by the first charging circuit alone, the method further comprises: controlling the voltage conversion circuit to step down the voltage provided by the power battery, so that the voltage of the first charging port connected to the first charging circuit is adapted to the output voltage of the external charging device.

[0094] Specifically, in this embodiment, the corresponding motor winding is charged during the process of controlling the external power supply connected to the first charging port 1 to charge the power battery 20, thereby reducing the charging voltage of the power battery 20, so that the voltage of the external charging device can normally charge the power battery 20.

[0095] In another embodiment of the application, as shown in Figure 12 When the power battery is charged by the second charging circuit alone, the method further comprises:

[0096] S121, acquiring the maximum output voltage of the external charging device connected to the second charging circuit.

[0097] S122, when the maximum output voltage is greater than or equal to the preset voltage threshold, controlling the second charging circuit to directly charge the power battery.

[0098] Specifically, since no voltage conversion circuit is arranged in the second charging circuit, when the power battery is charged by using the second charging circuit, the output voltage of the external charging device connected with the second charging port needs to be large enough to meet the charging of the power battery. For example, the output voltage of the charging gun connected with the second charging port needs to be greater than or equal to the full charging voltage of the power battery, so as to fully charge the power battery. Therefore, when the maximum output voltage of the external charging device connected with the second charging circuit is greater than the full charging voltage of the power battery, the second charging circuit is controlled to directly charge the power battery, that is, the second target charging current is controlled to be equal to the maximum allowable charging current of the power battery, and the first target charging current is controlled to be zero.

[0099] To sum up, the charging control method of the embodiment of the present application can improve the charging efficiency of the power battery, reduce the charging time, and be compatible with the national standard DC charging pile on the market, so as to ensure that the vehicle can be charged and improve the user experience.

[0100] Further, the present application provides a computer readable storage medium having a vehicle charging control program stored thereon, and the vehicle charging control program is executed by a processor to implement the vehicle charging control method according to the above embodiment.

[0101] The computer readable storage medium of the embodiment of the present application can improve the charging efficiency of the power battery, reduce the charging time, and be compatible with the national standard DC charging pile on the market, so as to ensure that the vehicle can be charged and improve the user experience.

[0102] Figure 13 is a structural block diagram of a vehicle charging controller according to the embodiment of the present application.

[0103] Further, as Figure 13 shown, the present application provides a vehicle charging controller 200, which includes a memory 201, a processor 202, and a vehicle charging control program stored in the memory 201 and executable on the processor 202. When the processor 202 executes the vehicle charging control program, the vehicle charging control method according to the above embodiment is implemented.

[0104] The vehicle charging controller of the embodiment of the present application includes a memory and a processor, and the processor executes the vehicle charging control program stored in the memory, which can improve the charging efficiency of the power battery, reduce the charging time, and be compatible with the national standard DC charging pile on the market, so as to ensure that the vehicle can be charged and improve the user experience.

[0105] Figure 14 is a structural block diagram of a charging system according to the embodiment of the present application.

[0106] Further, the application provides a charging system 300 of a vehicle, which comprises a first charging loop 11, a second charging loop 12 and a controller 14.

[0107] The voltage conversion circuit is configured to perform boost charging on the power battery 20; the second charging loop 12 is configured to perform direct charging on the power battery 20; the controller 14 is configured to determine the maximum allowable charging current of the power battery 20 when the first charging loop 11 and the second charging loop 12 simultaneously charge the power battery 20, and to allocate the first target charging current of the first charging loop 11 and the second target charging current of the second charging loop 12 according to the maximum allowable charging current of the power battery 20, and to control the first charging loop 11 according to the first target charging current and to control the second charging loop 12 according to the second target charging current.

[0108] In some embodiments of the application, the controller 14 is further configured to, when the maximum allowable charging current of the power battery 20 is greater than a first preset current threshold and less than a second preset current threshold, take the smaller value between a first current value and a third preset current threshold as the second target charging current, and take the difference between the maximum allowable charging current of the power battery 20 and the actual charging current of the second charging loop 12 as the first target charging current, wherein the first current value is the difference between the maximum allowable charging current of the power battery 20 and a fourth preset current threshold, the third preset current threshold is greater than the fourth preset current threshold, and the sum of the third preset current threshold and the fourth preset current threshold is equal to the second preset current threshold; when the maximum allowable charging current of the power battery 20 is greater than or equal to the second preset current threshold, take the third preset current threshold as the second target charging current, and take the difference between the maximum allowable charging current of the power battery 20 and the actual charging current of the second charging loop as the first target charging current.

[0109] In some embodiments of the application, the controller 14 is further configured to, when the maximum allowable charging current of the power battery 20 is less than or equal to the first preset current threshold and the SOC of the power battery 20 is less than or equal to a first preset value, take half of the maximum allowable charging current of the power battery 20 as the second target charging current, and take the difference between the maximum allowable charging current of the power battery 20 and the actual charging current of the second charging loop as the first target charging current; when the maximum allowable charging current of the power battery 20 is less than or equal to the first preset current threshold and the SOC of the power battery 20 is greater than the first preset value, take the maximum allowable charging current of the power battery 20 as the second target charging current, and set the first target charging current to zero.

[0110] In some embodiments of the application, the first target charging current is less than or equal to the second target charging current.

[0111] In some embodiments of the application, the vehicle comprises a motor and a motor inverter, and the voltage conversion circuit is configured by multiplexing at least one phase winding of the motor and at least one corresponding phase leg of the three-phase bridge leg of the motor inverter.

[0112] In some embodiments of the application, when the voltage conversion circuit comprises three-phase windings of the motor and a three-phase bridge leg, one end of a first phase winding, one end of a second phase winding and one end of a third phase winding of the three-phase windings are connected together to form a neutral point, the other end of the first phase winding is connected to a middle node of a first phase bridge leg of the three-phase bridge leg, the other end of the second phase winding is connected to a middle node of a second phase bridge leg of the three-phase bridge leg, the other end of the third phase winding is connected to a middle node of a third phase bridge leg of the three-phase bridge leg, and a first capacitor is connected in parallel between the positive bus end and the negative bus end of the three-phase bridge leg.

[0113] In some embodiments of the application, the controller 14 is further configured to perform phase error control on the three-phase bridge leg, so that the first charging circuit 11 charges the power battery 20 according to the first target charging current.

[0114] In some embodiments of the application, the first charging circuit is adapted to be connected to an external charging device through the first charging port, and the first charging circuit further comprises a first contactor, a second capacitor and a second contactor, one end of the first contactor is connected to one end of the second capacitor, the other end of the first contactor is connected to the neutral point, one end of the second capacitor is connected to the positive pole of the first charging port, and the other end of the second capacitor is connected to the negative pole of the first charging port through the second contactor.

[0115] In some embodiments of the application, the voltage conversion circuit comprises a first inductor, a first switch tube, a second switch tube and a third capacitor, the first switch tube and the second switch tube are connected in series and have a first node, the first node is connected to the first inductor, and the third capacitor is connected in parallel with the first switch tube and the second switch tube connected in series.

[0116] In some embodiments of the application, the first charging circuit is adapted to be connected to an external charging device through the first charging port, and the first charging circuit further comprises a first contactor, a second capacitor and a second contactor, one end of the first contactor is connected to the positive pole of the first charging port, the other end of the first contactor is connected to the first inductor, one end of the second capacitor is connected to the other end of the first contactor and the first inductor respectively, and the other end of the second capacitor is connected to the negative pole of the first charging port through the second contactor.

[0117] In some embodiments of the present application, the second charging circuit is adapted to be connected to the external charging device through the second charging port, wherein the second charging circuit comprises a third contactor and a fourth contactor, one end of the third contactor is connected to the positive pole of the second charging port, the other end of the third contactor is connected to the positive pole of the power battery, one end of the fourth contactor is connected to the negative pole of the second charging port, and the other end of the fourth contactor is connected to the negative pole of the power battery after being connected to the negative pole of the voltage conversion circuit.

[0118] In some embodiments of the present application, the controller 14 is further configured to control the voltage conversion circuit according to the maximum allowable charging current of the power battery to enable the first charging circuit to perform boost charging on the power battery when the first charging circuit charges the power battery alone.

[0119] In some embodiments of the present application, the controller 14 is further configured to control the voltage conversion circuit to perform step-down conversion on the voltage provided by the power battery to enable the voltage of the first charging port connected to the first charging circuit to adapt to the output voltage of the external charging device before the first charging circuit charges the power battery alone.

[0120] In some embodiments of the present application, the controller 14 is further configured to obtain the maximum output voltage of the external charging device connected to the second charging circuit when the second charging circuit charges the power battery alone, and control the second charging circuit to perform direct charging on the power battery when the maximum output voltage is greater than or equal to a preset voltage threshold.

[0121] In some embodiments of the present application, the first charging circuit and the second charging circuit share the same controller 14; or the controller 14 comprises a first control unit and a second control unit, the first control unit is configured to control the electronic devices in the first charging circuit to achieve boost charging, and the second control unit is configured to control the electronic devices in the second charging circuit to achieve direct charging.

[0122] It should be noted that the specific implementation of the charging system in the embodiments of the present application can refer to the specific implementation of the charging control method in the above embodiments, which will not be described here.

[0123] To sum up, the charging system in the embodiment includes the first charging circuit, the second charging circuit and the controller, wherein the first charging circuit can perform boost charging on the power battery, the second charging circuit can perform direct connection charging on the power battery, when the first charging circuit and the second charging circuit simultaneously perform charging on the power battery, the controller can distribute target charging currents to the first charging circuit and the second charging circuit according to the maximum allowable charging current of the power battery, so that the first charging circuit and the second charging circuit can perform charging on the power battery according to the corresponding target charging currents, thereby improving the charging efficiency of the power battery, reducing the charging time length, being compatible with the national standard direct current charging pile on the market, ensuring that the vehicle can complete charging, and improving the user experience.

[0124] Figure 15 is a structural block diagram of a vehicle according to an embodiment of the present application.

[0125] Further, as shown in Figure 15 , the present application proposes a vehicle 400, which includes the charging system 300 in the above embodiment.

[0126] The vehicle of the embodiment of the present application can perform charging on the power battery according to the corresponding target charging current through the charging system in the above embodiment, thereby improving the charging efficiency of the power battery, reducing the charging time length, being compatible with the national standard direct current charging pile on the market, ensuring that the vehicle can complete charging, and improving the user experience.

[0127] In addition, other configurations and effects of the vehicle of the embodiment of the present application are known to those skilled in the art, and to reduce redundancy, they are not described here.

[0128] It is to be appreciated that the above description and the examples that follow are intended to be illustrative only and that changes can be made to the description, either functionally or chronologically, as well as changes being made concerning the order of implementation. The logic and / or steps represented in the flow diagrams and / or described herein can be considered as a sequence of executable instructions, and can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For purposes of this specification, a "computer-readable medium" can be any apparatus that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. The computer-readable medium can be, for example, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system (or apparatus) or a propagation medium. More specific examples (a non-exhaustive list) of the computer-readable medium include the following: an electrical connection (electronic) having one or more wires, a portable computer diskette (magnetic), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber (optical), and a portable compact disc read-only memory (CDROM). Note that the computer-readable medium can even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, for example, via optical scanning of the paper or other medium, then compiled, interpreted, or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.

[0129] It is to be understood that the various parts of the application can be implemented by hardware, software, firmware or a combination thereof. In the above embodiments, a number of steps or methods can be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any of the following technologies, known in the art, or a combination thereof, can be used: discrete logic circuitry having logic gates for implementing logic functions on data signals, application specific integrated circuits having appropriate combinational logic gates, programmable gate arrays (PGA), field programmable gate arrays (FPGA), etc.

[0130] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Also, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0131] In the description of the present application, it needs to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0132] In addition, the terms "first", "second", and the like used in the embodiments of the present application are only for the purpose of description, and cannot be understood as indicating or implying relative importance, or implicitly indicating the number of technical features referred to in the embodiments. Therefore, the features defined with "first", "second" and the like in the embodiments of the present application can be explicitly or implicitly indicated to include at least one of the features. In the description of the present application, the meaning of the word "plurality" is at least two or two or more, such as two, three, four, etc., unless otherwise specifically limited in the embodiments.

[0133] In the present application, unless otherwise specifically provided or limited in the embodiments, the terms "mounting", "connecting", "connecting" and "fixing" and the like appearing in the embodiments should be understood broadly, for example, the connection can be fixed connection, or detachable connection, or integral, which can be understood, or can be mechanical connection, electrical connection, etc. Of course, it can also be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements, or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific implementation situation.

[0134] In the present application, unless otherwise specifically provided and limited, the first feature "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0135] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and that variations, modifications, substitutions and changes can be made by those skilled in the art without departing from the scope of the present application.

Claims

1. A charge control method characterized by, The application is applied to a vehicle, the vehicle comprising a power battery and a charging system for charging the power battery, the charging system comprising a first charging loop and a second charging loop, the first charging loop being provided with a voltage conversion circuit configured to charge the power battery by boosting, and the second charging loop being configured to charge the power battery by direct connection, the method comprising: determining a maximum allowable charging current of the power battery when the power battery is charged by the first charging loop and the second charging loop at the same time; allocating a first target charging current of the first charging loop and a second target charging current of the second charging loop according to the maximum allowable charging current of the power battery; controlling the first charging loop according to the first target charging current and controlling the second charging loop according to the second target charging current.

2. The charge control method according to claim 1, characterized by, The allocation of the first target charging current of the first charging loop and the second target charging current of the second charging loop according to the maximum allowable charging current of the power battery comprises: when the maximum allowable charging current of the power battery is greater than a first preset current threshold and less than a second preset current threshold, taking the smaller one of a first current value and a third preset current threshold as the second target charging current, and taking the difference between the maximum allowable charging current of the power battery and the actual charging current of the second charging loop as the first target charging current, wherein the first current value is the difference between the maximum allowable charging current of the power battery and a fourth preset current threshold, the third preset current threshold is greater than the fourth preset current threshold, and the sum of the third preset current threshold and the fourth preset current threshold is equal to the second preset current threshold; when the maximum allowable charging current of the power battery is greater than or equal to the second preset current threshold, taking the third preset current threshold as the second target charging current, and taking the difference between the maximum allowable charging current of the power battery and the actual charging current of the second charging loop as the first target charging current.

3. The charge control method according to claim 2, characterized by, The allocation of the first target charging current of the first charging loop and the second target charging current of the second charging loop according to the maximum allowable charging current of the power battery further comprises: when the maximum allowable charging current of the power battery is less than or equal to the first preset current threshold and the SOC of the power battery is less than or equal to a first preset value, taking half of the maximum allowable charging current of the power battery as the second target charging current, and taking the difference between the maximum allowable charging current of the power battery and the actual charging current of the second charging loop as the first target charging current; when the maximum allowable charging current of the power battery is less than or equal to the first preset current threshold and the SOC of the power battery is greater than the first preset value, taking the maximum allowable charging current of the power battery as the second target charging current, and setting the first target charging current to zero.

4. The charge control method according to claim 1, characterized by, The vehicle further comprises a motor and a motor inverter, and at least one phase winding of the motor and at least one corresponding phase bridge arm of the three-phase bridge arm of the motor inverter are multiplexed to form the voltage conversion circuit.

5. The charge control method according to claim 4, characterized by, When the voltage conversion circuit comprises the three-phase winding of the motor and the three-phase bridge arm, one end of a first phase winding, one end of a second phase winding and one end of a third phase winding in the three-phase winding are connected together to form a neutral point, the other end of the first phase winding is connected to an intermediate node of a first phase bridge arm in the three-phase bridge arm, the other end of the second phase winding is connected to an intermediate node of a second phase bridge arm in the three-phase bridge arm, the other end of the third phase winding is connected to an intermediate node of a third phase bridge arm in the three-phase bridge arm, and a first capacitor is connected in parallel between the positive terminal and the negative terminal of the bus of the three-phase bridge arm, wherein the first charging circuit is controlled according to the first target charging current, including: The three-phase bridge arm is controlled in a phase error manner, so that the first charging circuit charges the power battery according to the first target charging current.

6. The charge control method according to claim 1, characterized by, When the first charging circuit alone charges the power battery, the method further comprises: controlling the voltage conversion circuit to provide step-up voltage conversion for the power battery, so that the voltage of the first charging port connected to the first charging circuit is adapted to the output voltage of the external charging device.

7. The charge control method according to claim 6, characterized by, Before the first charging circuit alone charges the power battery, the method further comprises: controlling the voltage conversion circuit to provide step-down voltage conversion for the power battery, so that the voltage of the first charging port connected to the first charging circuit is adapted to the output voltage of the external charging device.

8. The charge control method according to claim 1, characterized by, When the second charging circuit alone charges the power battery, the method further comprises: obtaining the maximum output voltage of the external charging device connected to the second charging circuit; when the maximum output voltage is greater than or equal to a preset voltage threshold, controlling the second charging circuit to directly charge the power battery.

9. A charging system, characterized by including: a first charging circuit, the first charging circuit being provided with a voltage conversion circuit and being configured to provide step-up charging for a power battery; a second charging circuit, the second charging circuit being configured to directly charge the power battery; a controller, configured to, when the first charging circuit and the second charging circuit simultaneously charge the power battery, determine a maximum allowable charging current of the power battery, and distribute a first target charging current of the first charging circuit and a second target charging current of the second charging circuit according to the maximum allowable charging current of the power battery, and control the first charging circuit according to the first target charging current and control the second charging circuit according to the second target charging current.

10. The charging system of claim 9, wherein, The first charging circuit and the second charging circuit share the same controller; or the controller comprises a first control unit and a second control unit, the first control unit is configured to control electronic devices in the first charging circuit to realize step-up charging, and the second control unit is configured to control electronic devices in the second charging circuit to realize direct charging.

11. A vehicle characterized by comprising: The charging system according to any one of claims 9-10. The charging system according to any one of claims 9-10.

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