A method, apparatus, vehicle, and storage medium for controlling vehicle charging.

Abstract

The application provides a method, device, vehicle and storage medium for controlling vehicle charging. The method is applied to the field of vehicle charging and includes the following steps: during a power battery charging process, determining whether the power battery meets a preset control condition according to a charging parameter of the power battery, the charging parameter being used to represent a charging state in the power battery charging process; in the case that the power battery meets the preset control condition, obtaining a target charging current after the power battery is increased and a target charging voltage after the power battery is reduced according to the charging parameter of the power battery; and charging the power battery according to the target charging current and the target charging voltage. The method can improve the charging speed, shorten the vehicle charging time and improve the user experience during the power battery charging process of the vehicle.

Description

Technical Field

[0001] This application relates to the field of vehicle charging, and more specifically, to a method, apparatus, vehicle, and storage medium for controlling vehicle charging in the field of vehicle charging. Background Technology

[0002] Currently, with the increasing severity of global environmental problems, more and more electric or hybrid vehicles are gradually becoming the preferred choice for car buyers.

[0003] When the battery power in an electric or hybrid vehicle is low, it can be charged using a charging station.

[0004] Therefore, in order to reduce the waiting time for users during the charging process of electric or hybrid vehicles, how to provide a faster and more efficient charging method has become an urgent problem to be solved. Summary of the Invention

[0005] This application provides a method, apparatus, vehicle, and storage medium for controlling vehicle charging. The method can improve charging speed, shorten vehicle charging time, and enhance user experience during the charging process of the vehicle's power battery.

[0006] In a first aspect, a method for controlling vehicle charging is provided, the method comprising: during the charging process of the power battery, determining whether the power battery meets preset control conditions based on the charging parameters of the power battery, the charging parameters being used to represent the charging state of the power battery during the charging process; if the power battery meets the preset control conditions, obtaining a target charging current increased and a target charging voltage decreased for the power battery based on the charging parameters of the power battery; and charging the power battery based on the target charging current and the target charging voltage.

[0007] In the above technical solution, this application provides a method for controlling vehicle charging during the charging process of the vehicle's power battery. This method, during power battery charging, can reduce voltage and increase current based on the real-time charging status of the power battery, thereby increasing the charging current during the charging process. Using a larger charging current during the battery charging stage can significantly increase the amount of charge generated by the power battery per unit time, enabling the power battery to achieve optimal charging efficiency, shortening charging time, improving charging efficiency, and thus alleviating user anxiety during charging, thereby improving the user experience.

[0008] In conjunction with the first aspect, in some possible implementations, the charging parameters include real-time charging capacity. Determining whether the power battery meets the preset control conditions based on the charging parameters of the power battery includes: determining that the power battery meets the preset control conditions when the real-time charging capacity is less than or equal to a capacity threshold; and determining that the power battery does not meet the preset control conditions when the real-time charging capacity is greater than the capacity threshold.

[0009] In the above technical solution, the vehicle can determine whether to step down and increase the current of the power battery based on the real-time charging status of the power battery. When the real-time charging status of the power battery is low, using a higher charging current can achieve a fast charging effect; when the real-time charging status is high, the battery is close to being fully charged, and no step-down and current-increase measures are taken to prevent overcharging and thermal runaway, reduce the rate of chemical reactions inside the power battery, and ensure the safety of the power battery during the charging process.

[0010] In conjunction with the first aspect and the above implementation methods, in some possible implementation methods, the charging parameters further include an initial charging current and an initial charging voltage. Obtaining the target charging current after an increase and the target charging voltage after a decrease based on the charging parameters of the power battery includes: determining the charging power of the power battery based on the initial charging current and the initial charging voltage; determining the required charging voltage during the charging process of the power battery based on the initial charging voltage; determining the required charging voltage as the target charging voltage; and determining the target charging current based on the required charging voltage and the charging power.

[0011] In conjunction with the first aspect and the above-described implementations, in some possible implementations, the battery management system further includes a drive motor connected to the power battery. The drive motor includes a target winding and a target drive arm connected to the target winding. Charging the power battery according to the target charging current and the target charging voltage includes: obtaining the rated charging voltage of the charging pile; determining a first duty cycle of the target drive arm according to the rated charging voltage and the required charging voltage; controlling the target drive arm to conduct according to the first duty cycle so that the input voltage of the target winding is equal to the rated charging voltage; and, if the conduction time of the target drive arm satisfies the first duty cycle, controlling the target drive arm to turn off according to the first duty cycle so as to step down the rated charging voltage through the target winding to obtain the required charging voltage and the target charging current, and charging the power battery through the target drive arm.

[0012] In conjunction with the first aspect and the above implementation methods, in some possible implementations, the battery management system further includes a charging port capacitor and a drive motor. The charging port capacitor is connected to the power battery through the drive motor. The drive motor includes a target winding and a target drive bridge arm connected to the target winding. Before determining whether the power battery meets the preset control conditions based on the charging parameters of the power battery, the method further includes: obtaining the rated charging voltage of the charging pile; determining the preset charging voltage of the charging port capacitor based on the rated charging voltage; and controlling the power battery to charge the charging port capacitor based on the preset charging voltage and the charging parameters, so that the voltage of the charging port capacitor reaches the preset charging voltage.

[0013] In the above technical solution, during the charging process of the power battery, the capacitor is pre-charged first, so that the capacitor voltage reaches the preset charging voltage, which is close to the rated charging voltage of the charging pile. This process ensures that the voltage of the entire battery management system can smoothly transition when the charging pile starts charging the power battery, avoiding large current surges caused by sudden voltage changes in the system and ensuring stability during the charging process.

[0014] In combination with the first aspect and the above implementation methods, in some possible implementation methods, the charging parameters include an initial charging voltage. Controlling the power battery to charge the charging port capacitor based on the preset charging voltage and the charging parameters includes: determining a second duty cycle of the target drive arm based on the initial charging voltage and the preset charging voltage; controlling the target drive arm to conduct based on the second duty cycle so that the input voltage of the target winding is equal to the initial charging voltage; and, if the conduction time of the target drive arm satisfies the second duty cycle, controlling the target drive arm to turn off based on the second duty cycle so that the initial charging voltage is boosted through the target winding to obtain the preset charging voltage, and then charging the charging port capacitor through the target drive arm.

[0015] In combination with the first aspect and the above implementation methods, in some possible implementation methods, the method further includes: charging the power battery with the initial charging voltage and initial charging current when the power battery does not meet the preset control conditions.

[0016] Secondly, a device for controlling vehicle charging is provided, applied to a vehicle's battery management system. The battery management system includes a power battery. The device includes: a condition judgment module, used to determine whether the power battery meets preset control conditions based on the charging parameters of the power battery during the charging process, the charging parameters representing the charging state of the power battery during the charging process; a parameter adjustment module, used to obtain a target charging current increased and a target charging voltage decreased for the power battery based on the charging parameters of the power battery when the power battery meets the preset control conditions; and a first charging module, used to charge the power battery according to the target charging current and the target charging voltage.

[0017] In conjunction with the second aspect, in some possible implementations, the charging parameter includes the real-time charging capacity, and the condition judgment module is specifically used to: determine that the power battery meets the preset control condition when the real-time charging capacity is less than or equal to the capacity threshold; and determine that the power battery does not meet the preset control condition when the real-time charging capacity is greater than the capacity threshold.

[0018] In conjunction with the second aspect and the above implementation methods, in some possible implementation methods, the charging parameters further include an initial charging current and an initial charging voltage. The parameter adjustment module is specifically used to: determine the charging power of the power battery based on the initial charging current and the initial charging voltage; determine the required charging voltage during the charging process of the power battery based on the initial charging voltage; determine the required charging voltage as the target charging voltage; and determine the target charging current based on the required charging voltage and the charging power.

[0019] In conjunction with the second aspect and the above implementation methods, in some possible implementations, the battery management system further includes a drive motor connected to the power battery. The drive motor includes a target winding and a target drive bridge arm connected to the target winding. The first charging module is specifically used for: acquiring the rated charging voltage of the charging pile; determining a first duty cycle of the target drive bridge arm based on the rated charging voltage and the required charging voltage; controlling the target drive bridge arm to conduct based on the first duty cycle, so that the input voltage of the target winding is equal to the rated charging voltage; and, if the conduction time of the target drive bridge arm satisfies the first duty cycle, controlling the target drive bridge arm to turn off based on the first duty cycle, so as to step down the rated charging voltage through the target winding to obtain the required charging voltage and the target charging current, and charging the power battery through the target drive bridge arm.

[0020] In conjunction with the second aspect and the above implementation methods, in some possible implementations, the battery management system further includes a charging port capacitor and a drive motor. The charging port capacitor is connected to the power battery through the drive motor. The drive motor includes a target winding and a target drive bridge arm connected to the target winding. Before determining whether the power battery meets the preset control conditions based on the charging parameters of the power battery, the device further includes: a second charging module, used to acquire the rated charging voltage of the charging pile; determine the preset charging voltage of the charging port capacitor based on the rated charging voltage; and control the power battery to charge the charging port capacitor based on the preset charging voltage and the charging parameters, so that the voltage of the charging port capacitor reaches the preset charging voltage.

[0021] In conjunction with the second aspect and the above implementation methods, in some possible implementation methods, the charging parameter includes an initial charging voltage, and the second charging module is specifically used to: determine the second duty cycle of the target drive bridge arm based on the initial charging voltage and the preset charging voltage; control the target drive bridge arm to be turned on based on the second duty cycle so that the input voltage of the target winding is equal to the initial charging voltage; when the on-time of the target drive bridge arm meets the second duty cycle, control the target drive bridge arm to be turned off based on the second duty cycle so as to boost the initial charging voltage through the target winding to obtain the preset charging voltage, and charge the charging port capacitor through the target drive bridge arm.

[0022] In conjunction with the second aspect and the above implementation methods, in some possible implementation methods, the device further includes: a third charging module, used to charge the power battery with the initial charging voltage and initial charging current of the power battery when the power battery does not meet the preset control conditions.

[0023] Thirdly, a vehicle is provided, including a memory and a processor. The memory is used to store executable program code, and the processor is used to call and run the executable program code from the memory, causing the vehicle to perform the methods described in the first aspect or any possible implementation thereof.

[0024] Fourthly, a computer program product is provided, comprising: computer program code, which, when run on a computer, causes the computer to perform the methods described in the first aspect or any possible implementation thereof.

[0025] Fifthly, a computer-readable storage medium is provided that stores computer program code, which, when executed on a computer, causes the computer to perform the methods described in the first aspect or any possible implementation thereof. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of a vehicle charging scenario provided in an embodiment of this application;

[0027] Figure 2 This is a schematic diagram of a system for controlling vehicle charging provided in an embodiment of this application;

[0028] Figure 3 This is a schematic flowchart illustrating a method for controlling vehicle charging provided in an embodiment of this application;

[0029] Figure 4 This is a schematic diagram of the structure of a battery management system provided in an embodiment of this application;

[0030] Figure 5 This is a schematic flowchart illustrating another method for controlling vehicle charging provided in an embodiment of this application;

[0031] Figure 6 This is a schematic diagram of a device for controlling vehicle charging provided in an embodiment of this application;

[0032] Figure 7 This is a schematic diagram of the structure of a vehicle provided in an embodiment of this application. Detailed Implementation

[0033] The technical solutions in this application will be clearly and thoroughly described below with reference to the accompanying drawings. In the description of the embodiments of this application, unless otherwise stated, " / " means "or," for example, A / B can mean A or B. "And / or" in the text is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more than two.

[0034] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0035] Before introducing the methods of the embodiments of this application, the application scenarios of the embodiments of this application will be introduced first.

[0036] Figure 1 This is a schematic diagram of a vehicle charging scenario provided in an embodiment of this application.

[0037] For example, such as Figure 1As shown, vehicle 101 is either a hybrid vehicle or an electric vehicle. If the battery charge of vehicle 101 is low while the vehicle is in motion, the user can drive to a charging location and connect the DC charging port on vehicle 101 to the DC charging gun on charging station 102 to charge the battery of vehicle 101.

[0038] In one possible implementation, when a charging station is charging multiple vehicles simultaneously during the charging process, each vehicle is expected to reach a specified battery level within a short period of time.

[0039] Currently, a common technique used in related technologies to shorten vehicle charging time is "voltage competition." Voltage competition, as the name suggests, involves competing for voltage. Referring to the example above, when a charging station charges multiple vehicles simultaneously, the vehicles can increase their voltage to obtain a higher charging current, achieving a faster charging effect.

[0040] However, increasing the charging voltage during the charging process as described above can lead to several problems. Excessive voltage places higher demands on the insulation of the power battery and the battery management system, increasing the cost of the battery management system. It can also cause the power battery to generate more heat, affecting the overall performance of the battery.

[0041] To address the aforementioned issues, this application provides a method for controlling vehicle charging. This method reduces internal heat in the power battery by increasing the charging current and decreasing the charging voltage during charging, thereby optimizing charging efficiency, increasing charging speed, and shortening charging time. This alleviates user anxiety during charging and improves the user experience.

[0042] Before introducing a method for controlling vehicle charging provided in the embodiments of this application, the structure and working principle of the system on which the method is implemented in the embodiments of this application will be introduced first.

[0043] Figure 2 This is a schematic diagram of a system for controlling vehicle charging provided in an embodiment of this application.

[0044] For example, such as Figure 2 As shown in the figure, the vehicle charging control system 200 provided in this application embodiment includes two main components: a charging pile 201 and a battery management system 202.

[0045] In one possible implementation, the battery management system 202 is further divided according to function, and may include a power battery, a pre-charge relay, a drive motor, a charging port capacitor (referred to as "capacitor"), a main positive relay, and a main negative relay.

[0046] Based on the composition of system 200, the charging process of the power battery in this embodiment of the application is roughly as follows:

[0047] When the vehicle's battery charge is low, the user connects the vehicle's DC charging port to the charging gun on the charging station 201. After connection, to ensure safety and stability during charging, the battery management system 202 typically closes the pre-charge relay and the main negative relay, allowing the capacitor voltage to gradually rise. This process is usually short-lived. After the capacitor voltage has gradually risen, the battery management system 202 further disconnects the pre-charge relay, thereby closing the main positive relay.

[0048] After the main positive relay is closed, the power battery continues to charge the capacitor, and the capacitor voltage rises further until it reaches the preset charging voltage at the capacitor terminal.

[0049] Once the charging voltage at the capacitor reaches the preset charging voltage, the battery management system 202 controls the switch connected to the charging pile 201 to close, and the charging pile 201 begins charging the power battery. During this process, the battery management system 202 can use the drive motor to perform a voltage reduction and current increase operation on the current and voltage from the charging pile 201, so that the final output current to the power battery increases and the voltage decreases, achieving the purpose of voltage reduction and current increase.

[0050] The following describes a method for controlling vehicle charging provided by an embodiment of this application.

[0051] Figure 3 This is a schematic flowchart illustrating a method for controlling vehicle charging according to an embodiment of this application. It should be understood that this method can be applied to... Figure 2 The battery management system 202 in the text specifically refers to the electronic control unit (ECU, also known as the controller) of the battery management system 202. For convenience, the controller of the battery management system 202 will be referred to as the "battery controller" below.

[0052] For example, such as Figure 3 As shown, the method 300 includes:

[0053] 301. During the charging process of the power battery, the power battery is judged to meet the preset control conditions based on the charging parameters of the power battery. The charging parameters are used to represent the charging status of the power battery during the charging process.

[0054] It should be understood that when a vehicle's battery charge is low, users need to charge it promptly using a charging station to ensure normal vehicle operation. Specifically, based on the DC charging port on the vehicle, users can connect the vehicle's external charging port to the charging gun on the charging station, thus initiating the charging process. The charging gun on the charging station has an interface compatible with the vehicle's DC charging port. Both the vehicle's charging port and the charging gun on the charging station must adhere to the corresponding charging interface standards.

[0055] Optionally, based on different charging interface standards, they can be categorized into Combined Charging System (CCS) interface standards, CHAdeMO, or GB / T. Each DC interface standard corresponds to a different charging interface. Specifically, the CCS standard corresponds to the CCS2 charging interface on vehicles, and the charging gun on the charging station is also a CCS2 charging gun. The CHAdeMO standard corresponds to the CHAdeMO interface on vehicles, and the charging gun on the charging station is also a CHAdeMO charging gun. The GB / T standard corresponds to the GB / T interface on vehicles, and the charging gun on the charging station is also a GB / T charging gun. This application does not limit the types of the two charging interfaces in its embodiments.

[0056] After the charging gun is connected to the vehicle's DC charging port, they can exchange some basic parameters. For example, the battery controller can send the rated charging voltage of the power battery to the charging pile and receive the rated charging voltage of the charging pile from the charging pile, in order to prepare for the subsequent charging process.

[0057] After connection, the battery controller can obtain the charging parameters of the power battery in real time, so as to monitor the charging status of the power battery during the charging process.

[0058] Optionally, charging parameters include initial charging voltage and initial charging current. Here, initial charging voltage refers to the charging voltage of the power battery before voltage reduction. Similarly, initial charging current refers to the charging current of the power battery before current ramp-up.

[0059] It should also be understood that after the vehicle's charging port is connected to the charging gun on the charging station, because the charging station's voltage is generally high, to avoid a sudden voltage change in the power battery at the start of charging, which could generate a large inrush current and affect the safety of the battery management system, the battery controller can pre-charge the battery management system before the charging station officially charges the power battery. This brings the power battery voltage close to the charging station's voltage. As mentioned above, this avoids the large current surge from a charging station directly connected to a high-voltage power source, and also prevents the power battery from "falsely charging" the charging station.

[0060] The specific meaning of "charging station fraud" is as follows: In some cases, if the charging station detects a large difference between the voltage of the power battery and the voltage at the charging station, the charging station will assume that there is a problem with the power battery or the battery management system, and thus refuse to charge or limit the charging power. This phenomenon is called "charging station fraud".

[0061] Specifically, during pre-charging, when the voltage of the power battery is close to that of the charging pile, the battery controller mainly controls the power battery to charge the capacitors in the battery management system, so that the voltage of the capacitors is close to the voltage at the charging pile end. The process is as follows.

[0062] In one possible implementation, the battery management system includes, in addition to the power battery, a charging port capacitor and a drive motor. The charging port capacitor is connected to the power battery through the drive motor. The drive motor includes a target winding and a target drive bridge arm connected to the target winding. Before determining whether the power battery meets the preset control conditions based on the charging parameters of the power battery, the method further includes:

[0063] Obtain the rated charging voltage of the charging station;

[0064] Determine the preset charging voltage of the charging port capacitor based on the rated charging voltage;

[0065] Based on the preset charging voltage and charging parameters, the power battery is controlled to charge the charging port capacitor so that the voltage of the charging port capacitor reaches the preset charging voltage.

[0066] The charging parameters mentioned above refer specifically to the initial charging voltage of the power battery during the capacitor charging process.

[0067] Figure 4 This is a schematic diagram of a battery management system provided in an embodiment of this application.

[0068] For example, such as Figure 4 The diagram shows the hardware structure of the battery management system. As can be seen from the diagram, the capacitor is connected to the drive motor.

[0069] The drive motor includes three windings, denoted as "first winding," "second winding," and "third winding." Each winding connects to two drive bridge arms (i.e., switching transistors). The two drive bridge arms connected to the first winding are... Figure 4 Switches 1 and 4 are in the middle; the two drive bridge arms connected by the second winding are Figure 4 Switches 2 and 5 are in the middle; the two drive bridge arms connected by the third winding are Figure 4 Switching transistors 3 and 6 are used in the circuit.

[0070] After the vehicle's DC charging port is connected to the charging gun, during the pre-charging process before formal charging, switch 1 on the battery management system side is closed, and switches 2 and 3 on the charging pile side are temporarily open. This indicates that although the power battery is connected to the charging pile and is in the charging process, the charging pile has not yet started charging the power battery.

[0071] During charging, switches 4, 5, and 6 remain off, while only one of switches 1, 2, or 3 needs to be turned on. In this embodiment, switch 1 is turned on as an example. Correspondingly, the turned-on switch is the target switch, i.e., the target drive bridge arm, and the winding connected to the target drive bridge arm is the target winding.

[0072] The purpose of pre-charging is to bring the voltage inside the battery management system closer to the voltage at the charging station. Therefore, when the battery controller controls the power battery to charge the capacitor, the final voltage reached at the capacitor terminal is determined by the rated charging voltage at the charging station.

[0073] Optionally, in this embodiment, the voltage ultimately reached at the capacitor terminal is denoted as the "preset charging voltage". Preset charging voltage = rated charging voltage of the charging pile - 20 (V).

[0074] For example, after the charging pile is connected to the vehicle's charging interface, the battery controller receives the rated charging voltage sent by the charging pile and calculates the preset charging voltage based on the relationship between the preset charging voltage and the rated charging voltage of the charging pile. For instance, assuming the rated charging voltage of the charging pile is 750V, then the preset charging voltage is 730V.

[0075] Since the charging station is not actually charging the power battery at this time, the initial charging voltage at the power battery end is low. During the charging process from the power battery to the capacitor, to bring the capacitor voltage to the preset charging voltage, the voltage can be boosted through the target winding.

[0076] Optionally, during the charging process of the power battery to the capacitor, the battery management system also includes a pre-charge relay, a pre-charge resistor, a main positive relay, and a main negative relay (not shown in the figure).

[0077] Specifically, the capacitor voltage is 0V when the power battery begins charging the capacitor. The battery controller can first close the pre-charge relay and the main negative relay, controlling the power battery to charge the capacitor through the pre-charge resistor. During this process, the capacitor voltage gradually rises until it approaches the initial charging voltage of the power battery, at which point the pre-charge relay opens and the main relay closes. The above process is generally short in duration, the purpose of which is to avoid large current surges caused by sudden voltage changes across the capacitor when the power battery is charging it.

[0078] After the main relay is closed, the capacitor voltage is already close to the initial charging voltage of the power battery. At this point, the entire charging circuit is in a relatively stable state. The battery controller can then control the power battery to continue charging the capacitor based on the capacitor's preset charging voltage and the power battery's initial charging voltage, so that the capacitor voltage reaches a preset charging voltage close to the charging station's rated charging voltage.

[0079] In one possible implementation, the power battery is controlled to charge the charging port capacitor according to a preset charging voltage and charging parameters, including:

[0080] The second duty cycle of the target drive arm is determined based on the initial charging voltage and the preset charging voltage.

[0081] According to the second duty cycle, control the target drive bridge arm to turn on so that the input voltage of the target winding is equal to the initial charging voltage;

[0082] When the on-time of the target winding meets the second duty cycle, the target drive bridge arm is controlled to turn off according to the second duty cycle, so as to boost the initial charging voltage through the target winding to obtain the preset charging voltage, and charge the charging port capacitor through the target drive bridge arm.

[0083] Specifically, in conjunction with the foregoing description, during the charging process of the capacitor by the power battery, since the initial charging voltage of the power battery is low, in order to make the capacitor voltage closer to the terminal voltage, the battery controller can boost the voltage through the target winding in the battery management system.

[0084] The principle behind boosting the voltage using the target winding is as follows: the target winding can be considered an inductor. When the target switch is turned on, current flows through the inductor, and the inductor is in a state of storing energy. Simultaneously, the diode is reverse-biased during the target switch's conduction period, preventing current from flowing from the inductor to the capacitor. When the target switch is turned off, the diode is forward-biased, and the energy stored in the inductor is released to the load and capacitor through the diode. Therefore, by controlling the duty cycle of the target switch, the output voltage is increased.

[0085] For example, such as Figure 4 As shown, during the period when switch 1 is closed (conducting), the current flows from the power battery → switch 1 → inductor; when switch 1 is turned off, the current flows from the inductor → capacitor.

[0086] Therefore, by controlling the duty cycle of the switching transistor, a voltage boosting effect can be achieved. The duty cycle of the switching transistor refers to the ratio of the on-time to the on-cycle within one conduction cycle.

[0087] The second duty cycle of the target switch can be calculated from the input voltage and output voltage of the target winding, specifically by solving the following formula (1). The input voltage of the target winding is the initial charging voltage of the power battery, and the output voltage of the target winding is the preset charging voltage.

[0088]

[0089] In formula (1):

[0090] D2: Second duty cycle;

[0091] V in The input voltage of the target winding, in this embodiment of the application, is the initial charging voltage of the power battery, in volts (V).

[0092] V out The output voltage of the target winding is, in this embodiment, a preset charging voltage, in volts (V).

[0093] Using the above formula, the battery controller can calculate the second duty cycle of the target switch during the boost process. Based on the conduction period and the second duty cycle of the target switch, the battery controller can calculate the conduction time of the target switch in one conduction cycle.

[0094] Based on the second duty cycle, the battery controller can control the target switch to turn on, directly connecting the power battery to the target winding. Therefore, the input voltage of the target winding is equal to the initial charging voltage of the power battery. Simultaneously, the target winding stores energy, and the current gradually increases. During this process, no current flows into the capacitor, so the capacitor voltage remains constant, i.e., still 0V.

[0095] After the conduction time meets the second duty cycle, the battery controller controls the target switch to turn off. At this time, the target winding begins to release energy and starts to charge the capacitor through the diode. The capacitor voltage gradually rises. When the turn-off time is reached, the capacitor voltage reaches the preset charging voltage.

[0096] Therefore, through the above process, the battery controller can make the capacitor voltage reach a value that is close to the rated charging voltage at the charging station when the power battery charges the capacitor.

[0097] In the above technical solution, during the charging process of the power battery, the capacitor is pre-charged first, so that the capacitor voltage reaches the preset charging voltage, which is close to the rated charging voltage of the charging pile. This process ensures that the voltage of the entire battery management system can smoothly transition when the charging pile starts charging the power battery, avoiding large current surges caused by sudden voltage changes in the system and ensuring stability during the charging process.

[0098] When the battery controller detects that the capacitor voltage has reached close to the rated charging voltage at the charging station, the charging station begins to officially charge the power battery.

[0099] For example, such as Figure 4 As shown, when the battery controller detects that the capacitor voltage has reached a level close to the rated charging voltage at the charging station, the battery controller controls switches 2 and 3 to close. Because the capacitor voltage is close to the rated charging voltage at the charging station, at the instant switches 2 and 3 close, since the current initial charging voltage of the power battery is much lower than the rated charging voltage at the charging station, the capacitor can quickly release its stored energy to provide current to the power battery. This allows the initial charging voltage of the power battery to rise rapidly to equal the capacitor voltage, thereby balancing the voltage of the entire system and ensuring that the charging station can stably supply power to the power battery.

[0100] During the charging process of the power battery, the charging pile outputs its rated charging voltage. At the beginning of charging, the charging pile can output a small current to achieve a smooth transition. This process is generally short-lived. While charging the power battery, the charging pile also charges the capacitor, but this charging time is negligible.

[0101] During charging, the battery controller can obtain the rated charging current of the power battery and send it to the charging pile so that the charging pile can supply power to the power battery with that rated charging current. Based on this, when the power battery begins to charge, the initial charging voltage of the power battery is equal to the preset charging voltage, and the initial charging current is equal to its own rated charging current.

[0102] During the formal charging process, in order to improve the charging speed, the battery controller in this embodiment can reduce the voltage and increase the current through the windings, thereby increasing the charging current. Specifically, this embodiment can set the conditions for reducing the voltage and increasing the current as preset control conditions based on the charging parameters of the power battery. The charging parameters are used to represent the charging state of the power battery during the charging process.

[0103] Optionally, when setting preset control conditions, the charging parameters may also include real-time charging power.

[0104] The reason for using the charging capacity of the power battery as a condition for whether to reduce voltage and increase current is that when the power battery has a high charge, its accept capacity decreases and its internal resistance increases. If high current charging is continued under these circumstances, it will cause more heat to be generated inside the power battery, increasing the risk of thermal runaway.

[0105] Therefore, when determining whether to reduce voltage and increase current through the target winding, the battery controller can do so based on the real-time charging capacity of the power battery.

[0106] One possible implementation involves determining whether the power battery meets preset control conditions based on its charging parameters, including:

[0107] When the real-time charging capacity is less than or equal to the capacity threshold, it is determined that the power battery meets the preset control conditions.

[0108] If the real-time charging capacity exceeds the power threshold, it is determined that the power battery does not meet the preset control conditions.

[0109] Optionally, the battery threshold is 90%.

[0110] During the actual charging process, the battery controller monitors the real-time charging level of the power battery and compares it with a threshold value. When the real-time charging level is less than or equal to 90%, a voltage reduction and current increase operation can be performed through the target winding to improve the charging efficiency of the power battery. Therefore, the battery controller determines that the power battery meets the preset control conditions. Conversely, when the real-time charging level is greater than 90%, the power battery is close to its charging state. To ensure the safety of the power battery, the battery controller determines that the power battery does not meet the preset control conditions.

[0111] In the above technical solution, the vehicle can determine whether to step down and increase the current of the power battery based on the real-time charging status of the power battery. When the real-time charging status of the power battery is low, using a higher charging current can achieve a fast charging effect; when the real-time charging status is high, the battery is close to being fully charged, and no step-down and current-increase measures are taken to prevent overcharging and thermal runaway, reduce the rate of chemical reactions inside the power battery, and ensure the safety of the power battery during the charging process.

[0112] 302. Under the condition that the power battery meets the preset control conditions, the target charging current of the power battery after the increase and the target charging voltage after the decrease are obtained according to the charging parameters of the power battery.

[0113] When the battery controller determines that the power battery meets the preset control conditions, the battery controller can control the target winding to perform a voltage reduction and current increase operation to obtain an increased target charging current and a reduced target charging voltage.

[0114] In the above process, the charging parameters specifically include the initial charging current and the initial charging voltage.

[0115] In one possible implementation, based on the charging parameters of the power battery, the increased target charging current and decreased target charging voltage of the power battery are obtained, including:

[0116] The charging power of the power battery is determined based on the initial charging current and initial charging voltage.

[0117] Determine the required charging voltage during the charging process of the power battery based on the initial charging voltage;

[0118] The required charging voltage is determined to be the target charging voltage;

[0119] Determine the target charging current based on the required charging voltage and charging power.

[0120] It should be understood that during the process of the battery controller stepping down the voltage and increasing the current through the target winding, the charging power of the power battery remains constant. Therefore, the battery controller can first obtain the initial charging current and initial charging voltage of the power battery when it is officially charging, and then calculate the charging power of the power battery, which is also the charging power output by the charging pile.

[0121] When the power battery starts charging, the initial charging voltage is equal to the preset charging voltage, and the initial charging current is equal to the rated charging current requested by the power battery.

[0122] The battery controller obtains the charging power based on the initial charging voltage and initial charging current. During the buck-boost process, the power battery can determine the required charging voltage based on the real-time initial charging voltage and use it as the target charging voltage after bucking. Then, based on the charging power and the target charging voltage, the target charging current, i.e., the charging current of the power battery after boosting, is calculated.

[0123] Optionally, in this embodiment, the relationship between the required charging voltage and the initial charging voltage is: required charging voltage = initial charging voltage + 20.

[0124] It should be understood that since the initial charging voltage of the power battery is equal to the preset charging voltage, it differs from the charging pile voltage by 20V. In this case, during the first step-down and step-up current process, the battery controller can obtain the initial charging voltage of the power battery at the previous moment, i.e., the initial charging voltage of the power battery before the capacitor balances the system voltage. Further, based on this initial charging voltage and the relationship between the initial charging voltage and the required charging voltage, the battery controller determines the required charging voltage, which is the target charging voltage. After obtaining the required charging voltage, the battery controller can obtain the target charging current based on the charging power and the required charging voltage. The battery controller can then reduce the rated charging voltage from the charging pile to the target charging voltage and increase the rated charging current from the charging pile to the target charging current through step-down and step-up current.

[0125] As the buck-boost process progresses, the initial charging voltage of the power battery is continuously updated; that is, the initial charging voltage at each moment is the target charging voltage after the previous buck-boost operation. Therefore, the battery controller needs to periodically implement buck-boost operations based on the initial charging voltage of the power battery. In a new buck-boost phase, the battery controller continues to determine the current required charging voltage based on the initial charging voltage and the relationship between the initial charging voltage and the required charging voltage, and then bucks the voltage to that required charging voltage. This process continues, meaning that after each buck-boost process, the final input voltage of the power battery is equal to the required charging voltage. Correspondingly, the target charging current in each buck-boost process can be calculated based on the charging power and the corresponding required charging voltage.

[0126] In addition to the methods for determining the target charging current and target charging voltage described above, this application also proposes another method for determining the target charging current and target charging voltage.

[0127] In one possible implementation, the charging parameters include an initial charging current and an initial charging voltage. Based on the charging parameters of the power battery, the target charging current after the power battery is increased and the target charging voltage after the power battery is decreased are obtained, including:

[0128] The charging power of the power battery is determined based on the initial charging current and initial charging voltage.

[0129] Determine the target charging current based on the real-time charging capacity;

[0130] Determine the target charging voltage based on the charging power and the target charging current.

[0131] Specifically, similar to the previous method, the battery controller can first determine the charging power of the power battery based on its initial charging current and initial charging voltage. Since the real-time charging capacity continuously increases during the charging process, the required charging current also changes accordingly.

[0132] Therefore, in this embodiment, the charging current corresponding to different charging capacity ranges can be preset in advance and stored in the battery controller. After obtaining the real-time charging capacity, the battery controller obtains the target charging current required for the current charging by looking up a table, and then obtains the target charging voltage based on the charging power and the target charging current.

[0133] Therefore, through the above process, the battery controller can determine the target charging current and target charging voltage during the buck-boost process.

[0134] 303. Charge the power battery according to the target charging current and target charging voltage.

[0135] Once the target charging current and target charging voltage are determined, the battery controller needs to reduce the rated charging voltage from the charging station to the target charging voltage and increase the rated charging current of the charging station to the target charging current to charge the power battery. This process can also be achieved using a target winding.

[0136] In one possible implementation, the power battery is charged according to the target charging current and the target charging voltage, including:

[0137] Obtain the rated charging voltage of the charging station;

[0138] The first duty cycle of the target drive arm is determined based on the rated charging voltage and the required charging voltage.

[0139] According to the first duty cycle, control the target drive bridge arm to turn on so that the input voltage of the target winding is equal to the rated charging voltage;

[0140] When the conduction time of the target drive arm meets the first duty cycle, the target drive arm is controlled to turn off according to the first duty cycle, so as to reduce the rated charging voltage through the target winding to obtain the required charging voltage and target charging current, and charge the power battery through the target drive arm.

[0141] When the charging pile is charging the power battery, the output voltage of the charging pile is the rated charging voltage. Since it is necessary to control the input voltage of the power battery to the required charging voltage, the battery controller can step down the voltage through the target winding in the battery management system.

[0142] The principle behind voltage reduction via the target winding is as follows: When the target switch is turned on, current flows from the charging pile into the inductor. During this time, the inductor stores energy, and the current gradually increases. The diode is reverse-biased, preventing current from flowing from the inductor to the power battery. When the target switch is turned off, the energy stored in the inductor needs to continue flowing, causing the diode to be forward-biased. Current then flows through the diode to the power battery. By controlling the duty cycle of the target switch, the higher input voltage of the target winding is converted into a lower output voltage.

[0143] For example, such as Figure 4 As shown, during the conduction period of switch 1, the current flows from the charging pile → switch 1 → inductor; when switch 1 is turned off, the current flows from the inductor → power battery.

[0144] The first duty cycle of the target switching transistor can be calculated from the input voltage and output voltage of the target winding, specifically by solving the following formula (2). The input voltage of the target winding is the rated charging voltage of the charging pile, and the output voltage of the target winding is either the required charging voltage or the target charging voltage.

[0145]

[0146] In formula (2):

[0147] D1: First duty cycle;

[0148] V in The input voltage of the target winding, in this embodiment of the application, is the rated charging voltage of the charging pile, in volts (V).

[0149] V out The output voltage of the target winding, in this embodiment, is the target charging voltage, in volts (V).

[0150] Using the above formula, the battery controller can calculate the first duty cycle of the target switch during the buck process. Based on the conduction period of the target switch and the first duty cycle, the battery controller can calculate the conduction time of the target switch in one conduction cycle.

[0151] Based on the first duty cycle, the battery controller can control the target switch to turn on, and the charging pile is directly connected to the target winding. Therefore, the input voltage of the target winding is equal to the rated charging voltage of the charging pile. At the same time, the target winding stores energy, and the current gradually increases.

[0152] After the conduction time meets the first duty cycle, the battery controller controls the target switch to turn off. At this time, the target winding begins to release energy and starts to charge the power battery through the diode. The power battery voltage gradually decreases. When the turn-off time is reached, the power battery voltage reaches the target charging voltage and the power battery current reaches the target charging current.

[0153] Therefore, through the above process, the battery controller can increase the charging current of the power battery and improve the charging efficiency when the charging pile charges the power battery.

[0154] In another scenario, if the power battery does not meet the preset control conditions, the battery controller does not need to perform a voltage reduction and current increase operation through the target winding.

[0155] One possible implementation method also includes:

[0156] If the power battery does not meet the preset control conditions, the power battery is charged using the initial charging voltage and initial charging current.

[0157] In summary, this application provides a method for controlling vehicle charging during the charging process of a vehicle's power battery. This method can reduce the voltage and increase the current based on the real-time charging status of the power battery, thereby increasing the charging current during the charging process. The use of a larger charging current during the battery charging phase significantly increases the amount of charge generated by the power battery per unit time, enabling the power battery to achieve optimal charging efficiency, shortening charging time, and improving charging efficiency. This alleviates user anxiety during charging and enhances the user experience.

[0158] To facilitate understanding of the process of the embodiments of this application, the following is a description... Figure 5 The overall process of the embodiments of this application will be described.

[0159] Figure 5 This is a schematic flowchart illustrating another method for controlling vehicle charging provided in an embodiment of this application.

[0160] For example, such as Figure 5 As shown, the method 500 includes:

[0161] 501. During the charging process of the power battery, obtain the rated charging voltage of the charging pile.

[0162] 502. Determine the preset charging voltage of the charging port capacitor based on the rated charging voltage.

[0163] 503. Determine the second duty cycle of the target drive arm based on the initial charging voltage and the preset charging voltage.

[0164] 504, Based on the second duty cycle, control the target drive arm to conduct.

[0165] 505. If the conduction time of the target drive arm meets the second duty cycle, control the target drive arm to turn off according to the second duty cycle.

[0166] 506. Based on the charging parameters of the power battery, determine whether the power battery meets the preset control conditions.

[0167] If the power battery does not meet the preset control conditions, execute 507;

[0168] If the power battery meets the preset control conditions, execute 508-512.

[0169] 507. When the power battery does not meet the preset control conditions, the power battery is charged with the initial charging voltage and initial charging current of the power battery.

[0170] 508. Determine the charging power of the power battery based on the initial charging current and initial charging voltage.

[0171] 509. Based on the initial charging voltage, determine the target charging voltage and target charging current during the charging process of the power battery.

[0172] 510. Determine the first duty cycle of the target drive arm based on the rated charging voltage and the required charging voltage.

[0173] 511, Based on the first duty cycle, control the target drive arm to conduct.

[0174] 512, if the conduction time of the target drive arm meets the first duty cycle, control the target drive arm to turn off according to the first duty cycle.

[0175] Methods 501-512 in method 500 have the same inventive concept as methods 301-303 in method 300. For details, please refer to the description in the aforementioned method 300, which will not be repeated here.

[0176] Figure 6 This is a schematic diagram of a device for controlling vehicle charging according to an embodiment of this application. It is applied to a vehicle battery management system, which includes a power battery.

[0177] For example, such as Figure 6 As shown, the device 600 includes:

[0178] The condition judgment module 601 is used to determine whether the power battery meets the preset control conditions based on the charging parameters of the power battery during the charging process. The charging parameters are used to represent the charging state of the power battery during the charging process.

[0179] The parameter adjustment module 602 is used to obtain the target charging current of the power battery after it is increased and the target charging voltage after it is decreased, based on the charging parameters of the power battery, when the power battery meets the preset control conditions.

[0180] The first charging module 603 is used to charge the power battery according to the target charging current and the target charging voltage.

[0181] In one possible implementation, the charging parameter includes the real-time charging capacity. The condition judgment module 601 is specifically used to: determine that the power battery meets the preset control condition when the real-time charging capacity is less than or equal to the capacity threshold; and determine that the power battery does not meet the preset control condition when the real-time charging capacity is greater than the capacity threshold.

[0182] In one possible implementation, the charging parameters further include an initial charging current and an initial charging voltage. The parameter adjustment module 602 is specifically used to: determine the charging power of the power battery based on the initial charging current and the initial charging voltage; determine the required charging voltage during the charging process of the power battery based on the initial charging voltage; determine the required charging voltage as the target charging voltage; and determine the target charging current based on the required charging voltage and the charging power.

[0183] In one possible implementation, the battery management system further includes a drive motor connected to the power battery. The drive motor includes a target winding and a target drive arm connected to the target winding. The first charging module 603 is specifically used for: acquiring the rated charging voltage of the charging pile; determining a first duty cycle of the target drive arm based on the rated charging voltage and the required charging voltage; controlling the target drive arm to conduct based on the first duty cycle so that the input voltage of the target winding is equal to the rated charging voltage; and, if the conduction time of the target drive arm satisfies the first duty cycle, controlling the target drive arm to turn off based on the first duty cycle so that the rated charging voltage is stepped down through the target winding to obtain the required charging voltage and the target charging current, and charging the power battery through the target drive arm.

[0184] Optionally, the battery management system further includes a charging port capacitor and a drive motor. The charging port capacitor is connected to the power battery through the drive motor. The drive motor includes a target winding and a target drive bridge arm connected to the target winding. Before determining whether the power battery meets the preset control conditions based on the charging parameters of the power battery, the device further includes: a second charging module, used to acquire the rated charging voltage of the charging pile; determine the preset charging voltage of the charging port capacitor based on the rated charging voltage; and control the power battery to charge the charging port capacitor based on the preset charging voltage and the charging parameters, so that the voltage of the charging port capacitor reaches the preset charging voltage.

[0185] In one possible implementation, the charging parameters include an initial charging voltage. The second charging module is specifically used to: determine a second duty cycle of the target drive bridge arm based on the initial charging voltage and the preset charging voltage; control the target drive bridge arm to conduct according to the second duty cycle, so that the input voltage of the target winding is equal to the initial charging voltage; when the conduction time of the target drive bridge arm meets the second duty cycle, control the target drive bridge arm to turn off according to the second duty cycle, so as to boost the initial charging voltage through the target winding to obtain the preset charging voltage, and charge the charging port capacitor through the target drive bridge arm.

[0186] Optionally, the device further includes a third charging module, used to charge the power battery with the initial charging voltage and initial charging current when the power battery does not meet the preset control conditions.

[0187] Figure 7 This is a schematic diagram of the structure of a vehicle provided in an embodiment of this application.

[0188] For example, such as Figure 7 As shown, the vehicle 101 includes a memory 701 and a processor 702. The memory 701 stores executable program code 7011, and the processor 702 is used to call and execute the executable program code 7011 to perform a method for controlling vehicle charging.

[0189] Furthermore, embodiments of this application also protect an apparatus that may include a memory and a processor, wherein the memory stores executable program code, and the processor is used to call and execute the executable program code to perform a method for controlling vehicle charging provided in embodiments of this application.

[0190] This embodiment can divide the device into functional modules based on the above method example. For example, each module can correspond to a separate function, or two or more functions can be integrated into one processing module. The integrated module can be implemented in hardware. It should be noted that the module division in this embodiment is illustrative and only represents one logical functional division. In actual implementation, there may be other division methods.

[0191] When each functional module is divided according to its corresponding function, the device may further include a condition judgment module, a parameter determination module, and a first charging module, etc. It should be noted that all relevant content of each step involved in the above method embodiments can be referenced from the functional description of the corresponding functional module, and will not be repeated here.

[0192] It should be understood that the device provided in this embodiment is used to execute the above-described method for controlling vehicle charging, and therefore can achieve the same effect as the above-described implementation method.

[0193] When using an integrated unit, the device may include a processing module and a storage module. When the device is applied to a vehicle, the processing module can be used to control and manage the vehicle's movements. The storage module can be used to support the vehicle in executing relevant program code.

[0194] The processing module may be a processor or a controller, which can implement or execute various exemplary logic blocks, modules, and circuits shown in conjunction with the disclosure of this application. The processor may also be a combination of functions that implement computing capabilities, such as a combination of one or more microprocessors, a combination of digital signal processing (DSP) and a microprocessor, etc., and the storage module may be a memory.

[0195] In addition, the device provided in the embodiments of this application may specifically be a chip, component or module. The chip may include a connected processor and a memory. The memory is used to store instructions. When the processor calls and executes the instructions, the chip can execute a method for controlling vehicle charging provided in the above embodiments.

[0196] This embodiment also provides a computer-readable storage medium storing computer program code. When the computer program code is run on a computer, the computer executes the above-described related method steps to implement the method for controlling vehicle charging provided in the above embodiment.

[0197] This embodiment also provides a computer program product that, when run on a computer, causes the computer to perform the aforementioned related steps to implement a method for controlling vehicle charging provided in the above embodiment.

[0198] In this embodiment, the device, computer-readable storage medium, computer program product, or chip are all used to execute the corresponding methods provided above. Therefore, the beneficial effects they can achieve can be referred to the beneficial effects in the corresponding methods provided above, and will not be repeated here.

[0199] Through the above description of the embodiments, those skilled in the art will understand that, for the sake of convenience and brevity, only the division of the above functional modules is used as an example. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0200] In the embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another device, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0201] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method of controlling charging of a vehicle, characterized by, A battery management system applied to a vehicle, the battery management system comprising a power battery, the method comprising: During the charging process of the power battery, it is determined whether the power battery satisfies a preset control condition according to a charging parameter of the power battery, the charging parameter being used to represent a charging state in the charging process of the power battery; In a case where the power battery satisfies the preset control condition, a target charging current after the power battery is increased and a target charging voltage after the power battery is reduced are obtained according to the charging parameter of the power battery; The power battery is charged according to the target charging current and the target charging voltage; The battery management system further comprises a charging port capacitor and a driving motor, the charging port capacitor is connected with the power battery through the driving motor, the driving motor comprises a target winding and a target driving bridge arm connected with the target winding, the charging parameter comprises an initial charging voltage, before the determination whether the power battery satisfies the preset control condition according to the charging parameter of the power battery, the method further comprises: The rated charging voltage of a charging pile is obtained; The preset charging voltage of the charging port capacitor is determined according to the rated charging voltage; The second duty cycle of the target driving bridge arm is determined according to the initial charging voltage and the preset charging voltage; The target driving bridge arm is controlled to be turned on according to the second duty cycle, so that the input voltage of the target winding is equal to the initial charging voltage; In a case where the turn-on time of the target driving bridge arm satisfies the second duty cycle, the target driving bridge arm is controlled to be turned off according to the second duty cycle, so that the initial charging voltage is boosted through the target winding to obtain the preset charging voltage, and the charging port capacitor is charged through the target driving bridge arm, so that the voltage of the charging port capacitor reaches the preset charging voltage.

2. The method of claim 1, wherein, The charging parameter comprises a real-time charging power, the determination whether the power battery satisfies the preset control condition according to the charging parameter of the power battery comprises: In a case where the real-time charging power is less than or equal to a power threshold, it is determined that the power battery satisfies the preset control condition; In a case where the real-time charging power is greater than the power threshold, it is determined that the power battery does not satisfy the preset control condition.

3. The method of claim 2, wherein, The charging parameter further comprises an initial charging current and an initial charging voltage, the obtaining of the target charging current after the power battery is increased and the target charging voltage after the power battery is reduced according to the charging parameter of the power battery comprises: The charging power of the power battery is determined according to the initial charging current and the initial charging voltage; The required charging voltage in the charging process of the power battery is determined according to the initial charging voltage; The required charging voltage is determined as the target charging voltage; The target charging current is determined according to the required charging voltage and the charging power.

4. The method of claim 3, wherein, The battery management system further comprises a driving motor connected with the power battery, the driving motor comprises a target winding and a target driving bridge arm connected with the target winding, and the charging of the power battery according to the target charging current and the target charging voltage comprises: obtaining a rated charging voltage of a charging pile; determining a first duty cycle of the target driving bridge arm according to the rated charging voltage and the required charging voltage; controlling the target driving bridge arm to be turned on according to the first duty cycle, so that the input voltage of the target winding is equal to the rated charging voltage; in the case that the turn-on time of the target driving bridge arm meets the first duty cycle, controlling the target driving bridge arm to be turned off according to the first duty cycle, so as to obtain the required charging voltage and the target charging current by step-down of the rated charging voltage through the target winding, and charge the power battery through the target driving bridge arm.

5. The method of claim 1, wherein, The method further comprises: in the case that the power battery does not meet the preset control condition, charging the power battery with an initial charging voltage and an initial charging current of the power battery.

6. An apparatus for controlling charging of a vehicle, characterized by The battery management system applied to a vehicle, the battery management system comprises a power battery, and the device comprises: a condition judgment module, configured to judge whether the power battery meets a preset control condition according to a charging parameter of the power battery in a charging process of the power battery, the charging parameter being used to represent a charging state in the charging process of the power battery; a parameter adjustment module, configured to obtain a target charging current increased and a target charging voltage decreased of the power battery according to the charging parameter of the power battery in the case that the power battery meets the preset control condition; a first charging module, configured to charge the power battery according to the target charging current and the target charging voltage; wherein the battery management system further comprises a charging port capacitor and a driving motor, the charging port capacitor is connected with the power battery through the driving motor, the driving motor comprises a target winding and a target driving bridge arm connected with the target winding, the charging parameter comprises an initial charging voltage, and before the first charging module is configured to judge whether the power battery meets the preset control condition according to the charging parameter of the power battery, the first charging module is further configured to: obtain a rated charging voltage of a charging pile; determine a preset charging voltage of the charging port capacitor according to the rated charging voltage; determine a second duty cycle of the target driving bridge arm according to the initial charging voltage and the preset charging voltage; control the target driving bridge arm to be turned on according to the second duty cycle, so that the input voltage of the target winding is equal to the initial charging voltage; In a case where the on-time of the target drive bridge arm meets the second duty cycle, the target drive bridge arm is controlled to be turned off according to the second duty cycle, so as to boost the initial charging voltage by the target winding to obtain the preset charging voltage, and charge the charging port capacitor by the target drive bridge arm, so as to make the voltage of the charging port capacitor reach the preset charging voltage.

7. A vehicle characterized by comprising: The vehicle comprises: a memory for storing executable program code; a processor for calling and running the executable program code from the memory, so that the vehicle executes the method as claimed in any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that, The computer readable storage medium stores a computer program, when the computer program is executed, the method as claimed in any one of claims 1 to 5 is realized. The computer readable storage medium stores a computer program, when the computer program is executed, the method as claimed in any one of claims 1 to 5 is realized.

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