Method and device for controlling vehicle charging, vehicle and storage medium

Abstract

The invention provides a method and device for controlling vehicle charging, a vehicle and a storage medium, the method is applied to the field of vehicle charging, and the method comprises the steps that in the charging process of a power battery, whether the power battery meets a preset control condition or not is judged according to charging parameters of the power battery, the charging parameters are used for representing the charging state of the power battery in the charging process; under the condition that the power battery meets the preset control condition, according to 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 reduced are obtained; and charging the power battery according to the target charging current and the target charging voltage. According to the method, in the charging process of the power battery of the vehicle, the charging speed can be increased, the vehicle charging time is shortened, and the user experience is improved.

Description

Technical Field

[0001] The present application relates to the field of vehicle charging, and more specifically, to a method, device, vehicle and storage medium for controlling vehicle charging in the field of vehicle charging. Background Art

[0002] At present, with the increasingly severe global environmental problems, more and more electric vehicles or hybrid vehicles have gradually become the first choice for people to buy cars.

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

[0004] Based on this, in order to reduce the waiting time of users during the charging process of electric vehicles 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] The present application provides a method, device, vehicle and storage medium for controlling vehicle charging. The method can increase the charging speed and shorten the vehicle charging time during the vehicle's power battery charging process, thereby improving the user experience.

[0006] In a first aspect, a method for controlling vehicle charging is provided, the method comprising: during the charging process of the power battery, judging whether the power battery meets a preset control condition according to a charging parameter of the power battery, the charging parameter being used to indicate a charging state of the power battery during the charging process; when the power battery meets the preset control condition, obtaining an increased target charging current and a reduced target charging voltage of the power battery 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.

[0007] In the above technical solution, during the process of charging the power battery of the vehicle, the present application provides a method for controlling the charging of the vehicle. During the process of charging the power battery, the method can reduce the voltage and increase the current according to the real-time charging state of the power battery, thereby increasing the charging current during the charging process of the power battery. In the above battery charging stage, the use of a larger charging current can significantly increase the amount of charge of the power battery per unit time, so that the power battery has the best charging efficiency, shortens the charging time, and improves the charging efficiency, thereby alleviating the user's waiting anxiety during the charging process and improving the user experience.

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

[0009] In the above technical solution, the vehicle can determine whether to reduce the voltage and increase the current of the power battery according to the real-time charging capacity of the power battery. When the real-time charging capacity of the power battery is low, a higher charging current can be used to achieve a fast charging effect; when the real-time charging capacity is high, the battery is close to being fully charged, and no reduction in voltage and increase in current are taken, which can prevent battery overcharging and thermal runaway, reduce the chemical reaction rate inside the power battery, and ensure the safety of the power battery during the charging process.

[0010] In combination with the first aspect and the above-mentioned implementation methods, in some possible implementation methods, the charging parameters also include an initial charging current and an initial charging voltage, and the increased target charging current and the reduced target charging voltage of the power battery are obtained according to the charging parameters of the power battery, including: determining the charging power of the power battery according to the initial charging current and the initial charging voltage; determining the required charging voltage during the charging process of the power battery according to the initial charging voltage; determining the required charging voltage as the target charging voltage; and determining the target charging current according to the required charging voltage and the charging power.

[0011] In combination with the first aspect and the above-mentioned implementation methods, in some possible implementation methods, the battery management system also includes a drive motor, which is connected to the power battery, and the drive motor includes a target winding and a target drive bridge arm connected to the target winding. The power battery is charged according to the target charging current and the target charging voltage, including: obtaining the rated charging voltage of the charging pile; determining a first duty cycle of the target drive bridge arm according to the rated charging voltage and the required charging voltage; according to the first duty cycle, controlling the target drive bridge arm to be turned on so that the input voltage of the target winding is equal to the rated charging voltage; when the conduction time of the target drive bridge arm satisfies the first duty cycle, according to the first duty cycle, controlling the target drive bridge arm to be turned off, so as to step down the rated charging voltage through the target winding, obtain the required charging voltage and the target charging current, and charge the power battery through the target drive bridge arm.

[0012] In combination with the first aspect and the above-mentioned implementation methods, in some possible implementation methods, the battery management system also 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, and before judging whether the power battery meets the preset control conditions based on the charging parameters of the power battery, the method also 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 process of charging the power battery, the capacitor is pre-charged first, so that the voltage of the capacitor reaches a preset charging voltage, that is, a voltage close to the rated charging voltage of the charging pile. The above process can ensure that when the charging pile starts to charge the power battery, the voltage of the entire battery management system can transition smoothly, avoiding large current shocks 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-mentioned implementation methods, in some possible implementation methods, the charging parameter includes an initial charging voltage, and the power battery is controlled to charge the charging port capacitor according to the preset charging voltage and the charging parameter, including: determining the second duty cycle of the target drive bridge arm according to the initial charging voltage and the preset charging voltage; controlling the target drive 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; when the on-time of the target drive bridge arm satisfies the second duty cycle, controlling the target drive bridge arm to be turned 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.

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

[0016] In a second aspect, a device for controlling vehicle charging is provided, which is applied to a battery management system of a vehicle, the battery management system including a power battery, and the device including: a condition judgment module, used to judge whether the power battery meets a preset control condition according to a charging parameter of the power battery during the charging process of the power battery, and the charging parameter is used to indicate the charging state of the power battery during the charging process; a parameter adjustment module, used to obtain an increased target charging current and a reduced target charging voltage of the power battery according to the charging parameter of the power battery when the power battery meets the preset control condition; and a first charging module, used to charge the power battery according to the target charging current and the target charging voltage.

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

[0018] In combination with the second aspect and the above-mentioned implementation methods, in some possible implementation methods, the charging parameters also include an initial charging current and an initial charging voltage, and 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; determine the target charging current based on the required charging voltage and the charging power.

[0019] In combination with the second aspect and the above-mentioned implementation methods, in some possible implementation methods, the battery management system also includes a drive motor, which is connected to the power battery, and 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 to: obtain the rated charging voltage of the charging pile; determine a first duty cycle of the target drive bridge arm according to the rated charging voltage and the required charging voltage; according to the first duty cycle, control the target drive bridge arm to be turned on so that the input voltage of the target winding is equal to the rated charging voltage; when the conduction time of the target drive bridge arm satisfies the first duty cycle, according to the first duty cycle, control the target drive bridge arm to be turned off, so as to step down the rated charging voltage through the target winding, obtain the required charging voltage and the target charging current, and charge the power battery through the target drive bridge arm.

[0020] In combination with the second aspect and the above-mentioned implementation methods, in some possible implementation methods, the battery management system also 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, and before judging whether the power battery meets the preset control conditions based on the charging parameters of the power battery, the device also includes: a second charging module, used to obtain the rated charging voltage of the charging pile; determine the preset charging voltage of the charging port capacitor based on the rated charging voltage; 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 combination with the second aspect and the above-mentioned 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 according to 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 satisfies the second duty cycle, control the target drive bridge arm to be turned 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.

[0022] In combination with the second aspect and the above-mentioned implementation methods, in some possible implementation methods, the device also 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 condition.

[0023] In a third aspect, a vehicle is provided, comprising 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, so that the vehicle executes the method in the first aspect or any possible implementation of the first aspect.

[0024] In a fourth aspect, a computer program product is provided, comprising: a computer program code, which, when executed on a computer, enables the computer to execute the method in the first aspect or any possible implementation of the first aspect.

[0025] In a fifth aspect, a computer-readable storage medium is provided, which stores a computer program code. When the computer program code runs on a computer, the computer executes the method in the above-mentioned first aspect or any possible implementation manner of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of a vehicle charging scenario provided by an embodiment of the present application;

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

[0028] Figure 3 is a schematic flow chart of a method for controlling vehicle charging provided in an embodiment of the present application;

[0029] Figure 4 It is a structural schematic diagram of a battery management system provided in an embodiment of the present application;

[0030] Figure 5 is a schematic flow chart of another method for controlling vehicle charging provided in an embodiment of the present application;

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

[0032] Figure 7 It is a structural schematic diagram of a vehicle provided in an embodiment of the present application. DETAILED DESCRIPTION

[0033] The technical solution in the present application will be described clearly and in detail below in conjunction with the accompanying drawings. In the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B: "and / or" in the text is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0034] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as suggesting or implying 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 the features.

[0035] Before introducing the method of the embodiment of the present application, the application scenario of the embodiment of the present application is first introduced.

[0036] Figure 1 It is a schematic diagram of a vehicle charging scenario provided in an embodiment of the present application.

[0037] For example, Figure 1As shown, the type of vehicle 101 is a hybrid vehicle or an electric vehicle. When the vehicle 101 is driving, if the power battery of the vehicle 101 is low, the user can drive to a charging location and connect the DC charging port on the vehicle 101 to the DC charging gun on the charging pile 102 to charge the power battery of the vehicle 101.

[0038] In a possible implementation, when a vehicle is being charged, if a charging pile is charging multiple vehicles at the same time, it is expected that the power battery of each vehicle will reach a specified power level within a relatively short period of time.

[0039] At present, in the relevant technology, the common method used to shorten the charging time of vehicles is "competitive voltage". Competitive voltage, as the name suggests, is to compete for voltage. Combined with the above example, when a charging pile charges multiple vehicles at the same time, the vehicles can increase the voltage to obtain a higher charging current, thereby achieving a fast charging effect.

[0040] However, by increasing the charging voltage during the charging process, excessively high voltage will place higher requirements on the insulation of the power battery and the battery management system, thereby increasing the cost of the battery management system. Excessive high voltage will also increase the heat inside the power battery, affecting the overall performance of the battery.

[0041] Based on the above problems, the embodiment of the present application provides a method for controlling vehicle charging, which can reduce the heat inside the power battery by increasing the charging current and reducing the charging voltage during the charging process of the vehicle's power battery, so that the power battery has the best charging efficiency, improves the charging speed, and shortens the vehicle charging time. This alleviates the user's waiting anxiety during the charging process and improves the user experience.

[0042] Before introducing a method for controlling vehicle charging provided by an embodiment of the present application, the structure and working principle of the system on which the embodiment of the present application relies when implementing the method are first introduced.

[0043] Figure 2 It is a structural schematic diagram of a system for controlling vehicle charging provided in an embodiment of the present application.

[0044] For example, Figure 2 As shown, a system 200 for controlling vehicle charging provided in an embodiment of the present application includes two major components, namely a charging pile 201 and a battery management system 202 .

[0045] In a possible implementation, the battery management system 202 is further divided according to function and may include a power battery, a pre-charging 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 the system 200, the charging process of the power battery in the embodiment of the present application is roughly as follows:

[0047] When the power of the vehicle's power battery is low, the user connects the vehicle's DC charging port to the charging gun on the charging pile 201. After the connection, in order to ensure the safety and stability of the charging process, the general battery management system 202 will first close the pre-charge relay and the main negative relay to gradually increase the capacitor voltage. This process generally lasts for a short time. After the capacitor voltage gradually rises, 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 further rises until it reaches the preset charging voltage at the capacitor end.

[0049] When the charging voltage at the capacitor end 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 starts to charge the power battery. In this process, the battery management system 202 can drive the motor to reduce the voltage and increase the current from the charging pile 201, so that the current output to the power battery end increases and the voltage decreases, thereby achieving the purpose of reducing the voltage and increasing the current.

[0050] A method for controlling vehicle charging provided by an embodiment of the present application is introduced below.

[0051] Figure 3 is a schematic flow chart of a method for controlling vehicle charging provided in an embodiment of the present application. It should be understood that the method can be applied to Figure 2 The battery management system 202 in the present invention is specifically applied to the electronic control unit (ECU, also called controller) of the battery management system 202. For the sake of convenience, the controller of the battery management system 202 is referred to as a "battery controller" below.

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

[0053] 301 , during the charging process of the power battery, judging whether the power battery meets a preset control condition according to the charging parameters of the power battery, where the charging parameters are used to indicate the charging state of the power battery during the charging process.

[0054] It should be understood that when the power battery of the vehicle is low, in order to ensure the normal driving of the vehicle, the user needs to charge the vehicle power battery in time through the charging pile. Specifically, based on the DC charging port configured on the vehicle, when charging the vehicle, the user can connect the charging interface outside the vehicle to the charging gun on the charging pile, so that the power battery enters the charging process. Among them, the charging gun on the charging pile is an interface that matches the DC charging port on the vehicle. When the charging interface on the vehicle and the charging gun on the charging pile are connected, both interfaces need to comply with the corresponding charging interface standards.

[0055] Optionally, according to different charging interface standards, it can be divided into a combined charging system (CCS) interface standard, CHAdeMO or GB / T. Each DC interface standard corresponds to a different charging interface. Specifically, the charging interface on the vehicle corresponding to the CCS standard is the CCS2 charging interface, and the charging gun on the charging pile is also a CCS2 charging gun. The charging interface on the vehicle corresponding to the CHAdeMO standard is the CHAdeMO interface, and the charging gun on the charging pile is also a CHAdeMO charging gun. The charging interface on the vehicle corresponding to the GB / T standard is the GB / T interface, and the charging gun on the charging pile is also a GB / T charging gun. The embodiments of the present application do not limit the types of the two charging interfaces.

[0056] After the charging gun is connected to the DC charging port of the vehicle, some basic parameters can be sent to each other. 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 sent by the charging pile end, so as to prepare for the subsequent charging process.

[0057] After the connection is made, the battery controller can obtain the charging parameters of the power battery in real time to facilitate monitoring of the charging status of the power battery during the charging process.

[0058] Optionally, the charging parameters include an initial charging voltage and an initial charging current. The initial charging voltage here refers to the charging voltage of the power battery before the voltage is reduced. Similarly, the initial charging current refers to the charging current of the power battery before the current is increased.

[0059] It should also be understood that after the charging port on the vehicle is connected to the charging gun on the charging pile, since the voltage of the charging pile is generally high, in order to avoid a sudden change in the voltage of the power battery at the beginning of charging, a large impact current will be generated, affecting the safety of the battery management system. Before the charging pile officially charges the power battery, the battery controller can pre-charge the battery management system so that the voltage of the power battery is close to the voltage of the charging pile. As mentioned above, this can avoid the large current impact generated by the charging pile directly connected to the high-voltage power supply, and on the other hand, it can also avoid the power battery "cheating the pile".

[0060] Among them, the specific meaning of power battery cheating pile is: in some cases, if the charging pile detects that the power battery voltage is significantly different from the pile end voltage, the charging pile will think that there is a problem with the power battery or battery management system, and thus refuse to charge or limit the charging power. This phenomenon is called "cheating pile".

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

[0062] In a 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, and before judging whether the power battery meets the preset control condition according to the charging parameters of the power battery, the method further includes:

[0063] Get the rated charging voltage of the charging pile;

[0064] Determine the preset charging voltage of the charging port capacitor according to the rated charging voltage;

[0065] According to 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] In the above-mentioned process of controlling the power battery to charge the capacitor, the charging parameter specifically refers to the initial charging voltage of the power battery.

[0067] Figure 4 It is a structural schematic diagram of a battery management system provided in an embodiment of the present application.

[0068] For example, Figure 4 The hardware structure diagram of the battery management system is shown in FIG.

[0069] The drive motor includes three windings, which are respectively recorded as "first winding, second winding and third winding". Each winding is connected to two drive bridge arms (i.e., switch tubes). The two drive bridge arms connected to the first winding are Figure 4 The switch tube 1 and the switch tube 4 in the second winding are connected to the two driving bridge arms. Figure 4 The switch tube 2 and the switch tube 5 in the third winding are connected to the two driving bridge arms. Figure 4 Switch tube 3 and switch tube 6 in.

[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 switch 2 and switch 3 on the charging pile side are temporarily disconnected, indicating 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 the charging process, switch tubes 4, 5 and 6 are always turned off, and one of switch tubes 1, 2 and 3 can be turned on. In the embodiment of the present application, switch tube 1 is turned on as an example. Correspondingly, the turned-on switch tube is the target switch tube, that is, the target drive bridge arm, and the winding connected to the target drive bridge arm is the target winding.

[0072] Since the purpose of pre-charging is to make the voltage inside the battery management system close to the voltage at the charging pile end, when the battery controller controls the power battery to charge the capacitor, the voltage finally reached at the capacitor end is determined by the rated charging voltage at the charging pile end.

[0073] Optionally, in the embodiment of the present application, the voltage finally reached by the capacitor terminal is recorded as "preset charging voltage". Preset charging voltage = rated charging voltage of the charging pile - 20 (V).

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

[0075] Since the charging pile does not actually charge the power battery at this time, the initial charging voltage at the power battery end is low. In the process of charging the capacitor through the power battery, in order to make the voltage of the capacitor reach the preset charging voltage, the target winding can be used for boosting.

[0076] Optionally, during the process of charging the capacitor from the power battery, the battery management system further includes a pre-charging relay, a pre-charging 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 starts to charge the capacitor. The battery controller can first close the pre-charge relay and the main negative relay to control the power battery to charge the capacitor through the pre-charge resistor. In this process, the capacitor voltage gradually rises until it approaches the initial charging voltage of the power battery, and then the pre-charge relay disconnects and the main relay closes. The above process generally lasts for a short time in order to avoid a large current shock caused by a sudden change in the voltage across the capacitor when the power battery charges the capacitor.

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

[0079] In a possible implementation, according to a preset charging voltage and charging parameters, controlling the power battery to charge the charging port capacitor includes:

[0080] Determining a second duty cycle of the target driving bridge arm according to the initial charging voltage and the preset charging voltage;

[0081] According to the second duty cycle, the target driving bridge arm is controlled to be turned 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 satisfies 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 through the target winding to obtain a preset charging voltage, and charge the charging port capacitor through the target drive bridge arm.

[0083] Specifically, combined with the above description, in the process of charging the capacitor through the power battery, since the initial charging voltage of the power battery is low, in order to make the capacitor voltage reach a level close to the pile end voltage, in this process, the battery controller can boost the voltage through the target winding in the battery management system.

[0084] The principle of boosting the target winding is that the target winding can be regarded as an inductor. When the target switch is turned on, current flows through the inductor, and the inductor is in a state of storing energy. At the same time, the diode is reverse biased during the on-time of the target switch, preventing the 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, thereby increasing the output voltage by controlling the duty cycle of the target switch.

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

[0086] Based on this, the voltage boost effect can be achieved by controlling the duty cycle of the switch tube, wherein the duty cycle of the switch tube refers to the ratio of the on-time of the switch tube in a conduction cycle to the conduction cycle.

[0087] The second duty cycle of the target switch tube can be calculated by the input voltage and output voltage of the target winding, and is specifically obtained by solving the following formula (1). Among them, 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] Wherein, in formula (1):

[0090] D 2 : The second duty cycle;

[0091] V in : The input voltage of the target winding, which is the initial charging voltage of the power battery in the embodiment of the present application, unit: volt (V);

[0092] V out : The output voltage of the target winding, which is a preset charging voltage in the embodiment of the present application, unit: volt (V).

[0093] Through the above formula, the battery controller can calculate the second duty cycle of the target switch tube during the boost process. The battery controller can calculate the on-time of the target switch tube in one on-cycle based on the on-cycle of the target switch tube and the second duty cycle.

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

[0095] When the on-time satisfies the second duty cycle, the battery controller controls the target switch tube 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 off-time is reached, the capacitor voltage reaches the preset charging voltage.

[0096] Thus, through the above process, the battery controller can make the capacitor voltage reach a value relatively close to the rated charging voltage of the pile end when charging the capacitor through the power battery.

[0097] In the above technical solution, during the process of charging the power battery, the capacitor is pre-charged first, so that the voltage of the capacitor reaches a preset charging voltage, that is, a voltage close to the rated charging voltage of the charging pile. The above process can ensure that when the charging pile starts to charge the power battery, the voltage of the entire battery management system can transition smoothly, avoiding large current shocks 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 is close to the rated charging voltage of the charging pile, the charging pile begins to formally charge the power battery.

[0099] For example, Figure 4 As shown, when the battery controller detects that the capacitor voltage is close to the rated charging voltage of the pile end, the battery controller controls switch 2 and switch 3 to close. Since the capacitor voltage is close to the rated charging voltage of the pile end. Therefore, at the moment when switch 2 and switch 3 are closed, since the current initial charging voltage of the power battery is much lower than the rated charging voltage of the charging pile end. The capacitor can quickly release the stored energy and provide current to the power battery, so that the initial charging voltage of the power battery quickly rises to be equal to the capacitor voltage, thereby achieving the purpose of balancing the voltage of the entire system and ensuring that the charging pile can smoothly supply power to the power battery.

[0100] When the charging pile is charging the power battery, the charging pile outputs its rated charging voltage. At the beginning of the charging process, the charging pile can output a small current to achieve a smooth transition. This process generally lasts for a short time. When the charging pile is charging the power battery, it also charges the capacitor, but since the charging time of the charging pile to the capacitor is short, it can be ignored.

[0101] During the charging process, for the charging current, the battery controller can obtain the rated charging current of the power battery and send it to the charging pile end so that the charging pile end can supply power to the power battery with the rated charging current. Based on this, when the power battery starts to be formally charged, 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] In the formal charging process, in order to increase the charging speed, the battery controller in the embodiment of the present application can reduce the voltage and increase the current through the winding to increase the charging current. Specifically, the embodiment of the present application can set the conditions of reducing the voltage and increasing the current as the preset control conditions based on the charging parameters of the power battery. The charging parameters are used to indicate the charging state of the power battery during the charging process.

[0103] Optionally, when setting the 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 the voltage and increase the current is that when the power battery has a high capacity, the acceptance capacity of the power battery decreases and the internal resistance of the power battery increases. If high current charging continues in this case, more heat will be generated inside the power battery, increasing the risk of thermal runaway of the power battery.

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

[0106] In a possible implementation, judging whether the power battery meets a preset control condition according to the charging parameters of the power battery includes:

[0107] When the real-time charging power is less than or equal to the power threshold, determining that the power battery meets the preset control condition;

[0108] When the real-time charging power is greater than the power threshold, it is determined that the power battery does not meet the preset control condition.

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

[0110] During the formal charging process, the battery controller can monitor the real-time charging capacity of the power battery in real time and compare it with the power threshold. When the real-time charging capacity is less than or equal to 90%, in order to improve the charging efficiency of the power battery, the target winding can be used to perform a voltage reduction and current increase operation, so the battery controller determines that the power battery meets the preset control conditions. On the contrary, when the real-time charging capacity is greater than 90%, the power battery is close to the charging state. In order 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 reduce the voltage and increase the current of the power battery according to the real-time charging capacity of the power battery. When the real-time charging capacity of the power battery is low, a higher charging current can be used to achieve a fast charging effect; when the real-time charging capacity is high, the battery is close to being fully charged, and no reduction in voltage and increase in current are taken, which can prevent battery overcharging and thermal runaway, reduce the chemical reaction rate inside the power battery, and ensure the safety of the power battery during the charging process.

[0112] 302 , when the power battery meets a preset control condition, obtaining an increased target charging current and a reduced target charging voltage of the power battery according to a charging parameter 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 an initial charging current and an initial charging voltage.

[0115] In a possible implementation, obtaining the increased target charging current and the reduced target charging voltage of the power battery according to the charging parameters of the power battery includes:

[0116] Determine the charging power of the power battery according to the initial charging current and the initial charging voltage;

[0117] According to the initial charging voltage, determine the required charging voltage during the power battery charging process;

[0118] Determine the required charging voltage as 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 the charging power of the power battery remains unchanged during the process of the battery controller stepping down the voltage and increasing the current through the target winding. Therefore, the battery controller can first obtain the initial charging current and initial charging voltage when the power battery is officially charged, and calculate the charging power of the power battery, which is the charging power output by the charging pile.

[0121] When the power battery starts to charge, 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 obtained initial charging voltage and initial charging current. In the process of stepping down and increasing the current, the power battery can determine the required charging voltage of the power battery according to the real-time initial charging voltage, and use it as the target charging voltage after stepping down, and then calculate the target charging current according to the charging power and the target charging voltage, that is, the charging current of the power battery after increasing the current.

[0123] Optionally, in an embodiment of the present application, 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 voltage at the pile end by 20V. In this case, during the first step-down and current-raising process, the battery controller can obtain the initial charging voltage of the power battery at the previous moment, that is, the initial charging voltage of the power battery before the capacitor balances the voltage of the system. Further, the battery controller determines the required charging voltage based on the initial charging voltage and the relationship between the above-mentioned initial charging voltage and the required charging voltage, and the required charging voltage 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 reduce the rated charging voltage from the charging pile end to the target charging voltage and increase the rated charging current from the charging pile end to the target charging current by stepping down and current-raising.

[0125] As the buck-and-boost process proceeds, 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-and-boost process. Therefore, the battery controller needs to periodically implement the buck-and-boost operation according to the initial charging voltage of the power battery. In a new buck-and-boost stage, the battery controller continues to determine the current required charging voltage and step down to the required charging voltage based on the initial charging voltage and the relationship between the above initial charging voltage and the required charging voltage. By analogy, that is to say, after each buck-and-boost process is completed, the final input voltage of the power battery is equal to the required charging voltage. Correspondingly, the target charging current in each buck-and-boost process can be calculated based on the charging power and the corresponding required charging voltage.

[0126] In addition to the above-mentioned method for determining the target charging current and the target charging voltage, the embodiment of the present application also proposes another method for determining the target charging current and the target charging voltage.

[0127] In a possible implementation, the charging parameters include an initial charging current and an initial charging voltage. According to the charging parameters of the power battery, obtaining an increased target charging current and a reduced target charging voltage of the power battery includes:

[0128] Determine the charging power of the power battery according to the initial charging current and the initial charging voltage;

[0129] Determine the target charging current according to the real-time charging power;

[0130] The target charging voltage is determined based on the charging power and the target charging current.

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

[0132] Therefore, the embodiment of the present application can preset the charging current corresponding to different charging power intervals and store them in the battery controller. After obtaining the real-time charging power, the battery controller obtains the target charging current required for the current charging by looking up the 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 calculate the target charging current and target charging voltage during the voltage reduction and current increase process.

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

[0135] After determining the target charging current and target charging voltage, the battery controller needs to reduce the rated charging voltage from the charging pile to the target charging voltage, increase the rated charging current of the charging pile to the target charging current, and charge the power battery. The above process can also be achieved with the help of the target winding.

[0136] In a possible implementation, charging the power battery according to the target charging current and the target charging voltage includes:

[0137] Get the rated charging voltage of the charging pile;

[0138] Determining a first duty cycle of a target driving bridge arm according to a rated charging voltage and a required charging voltage;

[0139] According to the first duty cycle, the target driving bridge arm is controlled to be turned on so that the input voltage of the target winding is equal to the rated charging voltage;

[0140] When the on-time of the target drive bridge arm satisfies the first duty cycle, the target drive bridge arm is controlled to be turned off according to the first duty cycle, so as to step down the rated charging voltage through the target winding, obtain the required charging voltage and the target charging current, and charge the power battery through the target drive bridge arm.

[0141] When the charging pile is charging the power battery, the output voltage of the charging pile is the rated charging voltage. Since the input voltage of the power battery needs to be controlled to the required charging voltage, the battery controller can reduce the voltage through the target winding in the battery management system.

[0142] The principle of voltage reduction of the target winding is that when the target switch tube is turned on, the current flows from the charging pile to the inductor. The inductor stores energy during this period, and the current gradually increases. The diode is reverse biased, which prevents the current from flowing from the inductor to the power battery. When the target switch tube is turned off, the energy stored in the inductor needs to continue to flow, making the diode forward biased, and the current flows to the power battery through the diode, thereby converting the higher input voltage of the target winding into a lower output voltage by controlling the duty cycle of the target switch tube.

[0143] For example, Figure 4 As shown, when the switch tube 1 is turned on, the current flows from the charging pile → the switch tube 1 → the inductor; when the switch tube 1 is turned off, the current flows from the inductor → the power battery.

[0144] The first duty cycle of the target switch tube can be calculated by the input voltage and output voltage of the target winding, which can be obtained by solving the following formula (2). Among them, 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 the required charging voltage or the target charging voltage.

[0145]

[0146] Wherein, in formula (2):

[0147] D 1 : first duty cycle;

[0148] V in : The input voltage of the target winding, which is the rated charging voltage of the charging pile in the embodiment of the present application, in volts (V);

[0149] V out : The output voltage of the target winding, which is the target charging voltage in the embodiment of the present application, unit: volt (V).

[0150] Through the above formula, the battery controller can calculate the first duty cycle of the target switch tube during the voltage reduction process. The battery controller can calculate the on-time of the target switch tube in one on-time based on the on-time of the target switch tube and the first duty cycle.

[0151] Based on the first duty cycle, the battery controller can control the target switch tube to conduct, 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] When the on-time satisfies the first duty cycle, the battery controller controls the target switch tube 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 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 voltage reduction and current increase operations through the target winding.

[0155] In a possible implementation, the method further includes:

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

[0157] In summary, in the process of charging the power battery of the vehicle, the embodiment of the present application provides a method for controlling the charging of the vehicle. During the charging process of the power battery, the method can reduce the voltage and increase the current according to the real-time charging state of the power battery, thereby increasing the charging current during the charging process of the power battery. In the above-mentioned battery charging stage, the use of a larger charging current can significantly increase the charging charge of the power battery per unit time, so that the power battery has the best charging efficiency, shortens the charging time, and improves the charging efficiency, thereby alleviating the user's waiting anxiety during the charging process and improving the user experience.

[0158] In order to facilitate understanding of the process of the embodiment of the present application, Figure 5 The overall process of the embodiment of the present application is introduced.

[0159] Figure 5 It is a schematic flow chart of another method for controlling vehicle charging provided in an embodiment of the present application.

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

[0161] 501, during the power battery charging process, obtaining the rated charging voltage of the charging pile.

[0162] 502. Determine a preset charging voltage of the charging port capacitor according to the rated charging voltage.

[0163] 503 , determining a second duty cycle of the target driving bridge arm according to the initial charging voltage and the preset charging voltage.

[0164] 504 , controlling the target driving bridge arm to be turned on according to the second duty cycle.

[0165] 505 , when the 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.

[0166] 506 , judging whether the power battery meets a preset control condition according to the charging parameters of the power battery.

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

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

[0169] 507 , when the power battery does not meet the preset control condition, charging the power battery with the initial charging voltage and the initial charging current of the power battery.

[0170] 508 , determining the charging power of the power battery according to the initial charging current and the initial charging voltage.

[0171] 509 , determining a target charging voltage and a target charging current during the charging process of the power battery according to the initial charging voltage.

[0172] 510 , determining a first duty cycle of a target driving bridge arm according to a rated charging voltage and a required charging voltage.

[0173] 511, according to the first duty cycle, control the target driving bridge arm to be turned on.

[0174] 512 , when the on-time of the target driving bridge arm satisfies the first duty cycle, the target driving bridge arm is controlled to be turned off according to the first duty cycle.

[0175] 501-512 in the above method 500 and 301-303 in the method 300 have the same inventive concept, and the details can be found in the introduction of the above method 300, which will not be repeated here.

[0176] Figure 6 The present invention is a schematic diagram of a device for controlling vehicle charging provided in an embodiment of the present invention. The battery management system is applied to a vehicle, and the battery management system includes a power battery.

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

[0178] A condition judgment module 601 is used to judge whether the power battery meets a preset control condition according to a charging parameter of the power battery during the charging process of the power battery, wherein the charging parameter is used to indicate a charging state of the power battery during the charging process;

[0179] The parameter adjustment module 602 is used to obtain the increased target charging current and the reduced target charging voltage of the power battery according to the charging parameters of the power battery when the power battery meets the preset control condition;

[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 a real-time charging power, and the condition judgment module 601 is specifically used to: when the real-time charging power is less than or equal to a power threshold, determine that the power battery meets the preset control condition; when the real-time charging power is greater than the power threshold, determine that the power battery does not meet the preset control condition.

[0182] In one possible implementation, the charging parameters also include an initial charging current and an initial charging voltage, and 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 also includes a drive motor, which is 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 603 is specifically used to: obtain the rated charging voltage of the charging pile; determine a first duty cycle of the target drive bridge arm according to the rated charging voltage and the required charging voltage; control the target drive 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; when the on time of the target drive bridge arm satisfies the first duty cycle, control the target drive bridge arm to be turned off according to the first duty cycle, so as to step down the rated charging voltage through the target winding, obtain the required charging voltage and the target charging current, and charge the power battery through the target drive bridge arm.

[0184] Optionally, the battery management system also 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, and before judging whether the power battery meets the preset control conditions based on the charging parameters of the power battery, the device also includes: a second charging module, used to obtain the rated charging voltage of the charging pile; determine the preset charging voltage of the charging port capacitor based on the rated charging voltage; 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, 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 according to 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 satisfies the second duty cycle, control the target drive bridge arm to be turned 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, configured to charge the power battery with an initial charging voltage and an initial charging current of the power battery when the power battery does not meet the preset control condition.

[0187] Figure 7 It is a structural schematic diagram of a vehicle provided in an embodiment of the present application.

[0188] For example, Figure 7 As shown, the vehicle 101 includes: a memory 701 and a processor 702, wherein the memory 701 stores an 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] In addition, an embodiment of the present application also protects a device, which may include a memory and a processor, wherein the memory stores an executable program code, and the processor is used to call and execute the executable program code to execute a method for controlling vehicle charging provided in an embodiment of the present application.

[0190] In this embodiment, the functional modules of the device can be divided according to the above method example. For example, each functional module can be corresponded, or two or more functions can be integrated into one processing module. The above integrated module can be implemented in the form of hardware. It should be noted that the division of modules in this embodiment is schematic and is only a logical function division. There may be other division methods in actual implementation.

[0191] In the case of dividing each functional module according to each function, the device may also include a condition judgment module, a parameter determination module, a first charging module, etc. It should be noted that all relevant contents of each step involved in the above method embodiment can be referred to the functional description of the corresponding functional module, which will not be repeated here.

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

[0193] In the case of 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 may be used to control and manage the actions of the vehicle. The storage module may be used to support the vehicle in executing relevant program codes, etc.

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

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

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

[0197] This embodiment also provides a computer program product. When the computer program product is run on a computer, the computer is caused to execute the above-mentioned related steps to implement a method for controlling vehicle charging provided in the above embodiment.

[0198] Among them, the device, computer-readable storage medium, computer program product or chip provided in this embodiment is used to execute the corresponding method provided above. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding method provided above, and will not be repeated here.

[0199] Through the description of the above implementation methods, technical personnel in the relevant field can understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned 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 the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0201] The above contents are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for controlling vehicle charging, characterized in that: 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, judging whether the power battery meets a preset control condition according to a charging parameter of the power battery, wherein the charging parameter is used to indicate a charging state of the power battery during the charging process; When the power battery satisfies the preset control condition, obtaining an increased target charging current and a reduced target charging voltage of the power battery according to the charging parameters of the power battery; The power battery is charged according to the target charging current and the target charging voltage.

2. The method according to claim 1, characterized in that The charging parameter includes a real-time charging power, and judging whether the power battery meets a preset control condition according to the charging parameter of the power battery includes: When the real-time charging power is less than or equal to the power threshold, determining that the power battery meets the preset control condition; When the real-time charging power is greater than the power threshold, it is determined that the power battery does not meet the preset control condition.

3. The method according to claim 2, characterized in that The charging parameters also include an initial charging current and an initial charging voltage. The step of obtaining the increased target charging current and the reduced target charging voltage of the power battery according to the charging parameters of the power battery includes: Determining the charging power of the power battery according to the initial charging current and the initial charging voltage; Determining a required charging voltage during charging of the power battery according to the initial charging voltage; Determining that the required charging voltage is the target charging voltage; The target charging current is determined according to the required charging voltage and the charging power.

4. The method according to claim 3, characterized in that 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, and charging the power battery according to the target charging current and the target charging voltage includes: Get the rated charging voltage of the charging pile; Determining a first duty cycle of the target driving bridge arm according to the rated charging voltage and the required charging voltage; According to the first duty cycle, controlling the target driving bridge arm to be turned on so that the input voltage of the target winding is equal to the rated charging voltage; When the on-time of the target drive bridge arm satisfies the first duty cycle, the target drive bridge arm is controlled to be turned 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 charge the power battery through the target drive bridge arm.

5. The method according to claim 1, characterized in that The battery management system further includes a charging port capacitor and a drive motor, wherein the charging port capacitor is connected to the power battery via the drive motor, and the drive motor includes a target winding and a target drive bridge arm connected to the target winding. Before judging whether the power battery meets a preset control condition based on the charging parameter of the power battery, the method further includes: Get the rated charging voltage of the charging pile; Determining a preset charging voltage of the charging port capacitor according to the rated charging voltage; According to the preset charging voltage and the 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.

6. The method according to claim 5, characterized in that The charging parameter includes an initial charging voltage, and controlling the power battery to charge the charging port capacitor according to the preset charging voltage and the charging parameter includes: Determining a second duty cycle of the target driving bridge arm according to the initial charging voltage and the preset charging voltage; According to the second duty cycle, controlling the target driving bridge arm to be turned on 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 satisfies 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 through the target winding to obtain the preset charging voltage, and charge the charging port capacitor through the target drive bridge arm.

7. The method according to claim 1, characterized in that The method further comprises: When the power battery does not meet the preset control condition, the power battery is charged with an initial charging voltage and an initial charging current of the power battery.

8. A device for controlling vehicle charging, characterized in that: A battery management system for a vehicle, the battery management system comprising a power battery, the device comprising: a condition judgment module, used to judge whether the power battery meets a preset control condition according to a charging parameter of the power battery during the charging process of the power battery, wherein the charging parameter is used to indicate a charging state of the power battery during the charging process; a parameter adjustment module, configured to obtain, when the power battery satisfies the preset control condition, an increased target charging current and a reduced target charging voltage of the power battery according to the charging parameters of the power battery; The first charging module is used to charge the power battery according to the target charging current and the target charging voltage.

9. A vehicle, characterized in that: The vehicle comprises: A memory for storing executable program codes; A processor, configured to call and run the executable program code from the memory, so that the vehicle executes the method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed, the method according to any one of claims 1 to 7 is implemented.

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