Vehicle charging method, device, battery management system and storage medium

Abstract

The present invention discloses a vehicle charging method, device, battery management system, and storage medium. The method includes: controlling a charging pile to charge the vehicle based on an initial charging request current when the vehicle's full load current cannot be obtained, wherein the initial charging request current is determined based on the vehicle's battery; obtaining the vehicle's bus current after the charging pile charges the vehicle based on the initial charging request current; determining a target charging request current based on the bus current and the initial charging request current, wherein the actual charging current of the battery when the charging pile charges the vehicle based on the target charging request current matches the initial charging request current; and controlling the charging pile to charge the vehicle based on the target charging request current. The present invention solves the technical problem of failing to achieve optimal charging efficiency when charging electric vehicles due to vehicle load power consumption.

Description

Technical Field

[0001] The present invention relates to the field of new energy, and in particular to a vehicle charging method, device, battery management system and storage medium. Background Art

[0002] With national support, the new energy vehicle industry is rapidly expanding. Lithium batteries, the core energy source of new energy vehicles, offer advantages such as high specific energy, low self-discharge, and long cycle life, leading to their widespread adoption in electric vehicles. However, the widespread use of lithium-ion batteries has also brought challenges with charging current calculation. For example, when the vehicle load changes, the charging current cannot be adjusted in a timely manner, resulting in inaccurate charging current, which can lead to extended charging times, inability to fully charge, or excessive charging current.

[0003] To address the above-mentioned problems, no effective solutions have been proposed so far. Summary of the Invention

[0004] Embodiments of the present invention provide a vehicle charging method, device, battery management system, and storage medium to at least solve the technical problem of failing to achieve optimal charging efficiency due to vehicle load power consumption when charging an electric vehicle.

[0005] According to one aspect of an embodiment of the present invention, a vehicle charging method is provided, comprising: in a case where the vehicle load current cannot be obtained, controlling a charging pile to charge the vehicle based on an initial charging request current, wherein the initial charging request current is determined according to a battery of the vehicle; after the charging pile charges the vehicle according to the initial charging request current, obtaining a bus current of the vehicle; determining a target charging request current according to the bus current and the initial charging request current, wherein the actual charging current of the battery when the charging pile charges the vehicle according to the target charging request current matches the initial charging request current; and controlling the charging pile to charge the vehicle based on the target charging request current.

[0006] Optionally, determining the target charging request current based on the bus current and the initial charging request current includes: determining whether the direction of the bus current is a charging direction or a discharging direction, wherein the charging direction indicates that the battery is in a charging state, and the discharging direction indicates that the battery is in a discharging state; when the direction of the bus current is a discharging direction, adding the absolute value of the bus current and the absolute value of the initial charging request current to generate a first compensation current; adding the first compensation current and the absolute value of the initial charging request current to generate the target charging request current, wherein the direction of the target charging request current is a charging direction.

[0007] Optionally, the above method also includes: when the direction of the bus current is the charging direction, subtracting the absolute value of the bus current from the absolute value of the initial charging request current to generate a second compensation current; adding the second compensation current to the absolute value of the initial charging request current to generate the target charging request current, wherein the direction of the target charging request current is the charging direction.

[0008] Optionally, generating the target charging request current includes: comparing the second compensation current with the current compensation threshold; and generating the target charging request current when the second compensation current is greater than the current compensation threshold.

[0009] Optionally, controlling the charging pile to charge the vehicle based on the target charging request current includes: obtaining the maximum allowable output current of the charging pile; when the target charging request current is less than or equal to the maximum allowable output current, controlling the charging pile to charge the vehicle with the target charging request current; when the target charging request current is greater than the maximum allowable output current, controlling the charging pile to charge the vehicle with the maximum allowable output current.

[0010] Optionally, controlling the charging pile to charge the vehicle based on the target charging request current includes: obtaining the maximum allowable rate of current change of the charging pile; determining a current change rate request value based on the target charging request current and the initial charging request current; when the current change rate request value is greater than the maximum allowable rate of current change, controlling the output current of the charging pile to charge the vehicle to transition from the initial charging request current to the target charging request current according to the maximum allowable rate of current change; when the current change rate request value is less than or equal to the maximum allowable rate of current change, controlling the output current of the charging pile to charge the vehicle to transition from the initial charging request current to the target charging request current according to the current change rate request value.

[0011] According to another aspect of an embodiment of the present invention, a vehicle charging device is also provided, including: a first request module, used to control the charging pile to charge the vehicle based on an initial charging request current when the vehicle's entire load current cannot be obtained, wherein the initial charging request current is determined according to the battery of the vehicle; an acquisition module, used to obtain the bus current of the vehicle after the charging pile charges the vehicle according to the initial charging request current; a determination module, used to determine a target charging request current based on the bus current and the initial charging request current, wherein the actual charging current of the battery when the charging pile charges the vehicle according to the target charging request current matches the initial charging request current; and a second request module, used to control the charging pile to charge the vehicle based on the target charging request current.

[0012] According to another aspect of an embodiment of the present invention, a battery management system is provided, which is configured to run a program to execute any one of the above-mentioned vehicle charging methods.

[0013] According to another aspect of an embodiment of the present invention, a non-volatile storage medium is further provided, wherein the non-volatile storage medium includes a stored program, wherein when the program is running, the device where the non-volatile storage medium is located is controlled to execute any one of the above-mentioned vehicle charging methods.

[0014] According to another aspect of an embodiment of the present invention, a computer device is further provided, comprising a memory and a processor, wherein the memory is used to store programs, and the processor is used to run the programs stored in the memory, wherein when the program is run, any one of the above-mentioned vehicle charging methods is executed.

[0015] In an embodiment of the present invention, when the vehicle load current of the vehicle cannot be obtained, the charging pile is controlled to charge the vehicle based on the initial charging request current, wherein the initial charging request current is determined according to the battery of the vehicle; after the charging pile charges the vehicle according to the initial charging request current, the bus current of the vehicle is obtained; based on the bus current and the initial charging request current, the target charging request current is determined, wherein the actual charging current of the battery when the charging pile charges the vehicle according to the target charging request current matches the initial charging request current; the charging pile is controlled to charge the vehicle based on the target charging request current, thereby achieving the purpose of providing the optimal charging current for vehicles with uncertain loads, thereby realizing the technical effect of improving the charging efficiency of electric vehicles, and further solving the technical problem that the optimal charging efficiency cannot be achieved due to the power consumption of the vehicle load when charging electric vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 A hardware structure block diagram of a computer terminal for implementing a vehicle charging method is shown;

[0018] Figure 2 is a schematic flow chart of a vehicle charging method according to an embodiment of the present invention;

[0019] Figure 3 is a flowchart of a method for determining a charging current according to an optional embodiment of the present invention;

[0020] Figure 4 4 is a structural block diagram of a vehicle charging device provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0022] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0023] According to an embodiment of the present invention, an embodiment of a vehicle charging method is provided. It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0024] The method embodiments provided in the embodiments of the present application can be executed in a mobile terminal, a computer terminal or a similar computing device. Figure 1 The hardware structure block diagram of a computer terminal for implementing a vehicle charging method is shown in FIG. Figure 1 As shown, the computer terminal 10 may include one or more processors (processors 102a, 102b, ..., 102n are used as examples in the figure) (the processors may include but are not limited to processing devices such as microprocessors MCU or programmable logic devices FPGA), and a memory 104 for storing data. In addition, it may also include: a display, an input / output interface (I / O interface), a universal serial bus (USB) port (which may be included as one of the ports of the BUS bus), a network interface, a power supply, and / or a camera. It will be understood by those skilled in the art that Figure 1 The structure shown is only for illustration and does not limit the structure of the above electronic device. Figure 1 More or fewer components than shown, or with Figure 1 Different configurations shown.

[0025] It should be noted that the one or more processors and / or other data processing circuits described above may generally be referred to herein as "data processing circuitry." The data processing circuitry may be embodied in whole or in part as software, hardware, firmware, or any other combination thereof. Furthermore, the data processing circuitry may be a single, independent processing module, or may be incorporated in whole or in part into any of the other components of the computer terminal 10. As described in the embodiments of the present application, the data processing circuitry serves as a processor control (e.g., selection of a variable resistor terminal path connected to an interface).

[0026] The memory 104 can be used to store software programs and modules of application software, such as the program instructions / data storage device corresponding to the vehicle charging method in the embodiment of the present invention. The processor executes the software programs and modules stored in the memory 104 to execute various functional applications and data processing, that is, to implement the vehicle charging method of the above-mentioned application. The memory 104 may include high-speed random access memory and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include memory remotely located relative to the processor, and these remote memories may be connected to the computer terminal 10 via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0027] The display may be, for example, a touch screen liquid crystal display (LCD) that enables a user to interact with a user interface of the computer terminal 10 .

[0028] In scenarios where electric vehicles are charged using charging piles, although the existing charging current calculation scheme can compensate for the charging current, its compensation is based on the accurate current information of the load working current fed back by the vehicle-end equipment. When the vehicle-end equipment does not send accurate current information of the load current to the battery management system, the battery charging current may be inaccurate, which may cause the charging time to be extended or the battery to be unable to be fully charged for a long time.

[0029] This invention, based on existing battery charging characteristics, combines the charging current during the charging process with an estimate of the vehicle load during the charging process, performs compensation calculations, and achieves adaptive charging current, ensuring that the charging current remains within a reasonable range. This can solve the problem of excessively low charging current, which can lead to extended charging times and inability to fully charge the battery.

[0030] Figure 2 FIG. 1 is a flow chart of a vehicle charging method according to an embodiment of the present invention, which can be applied to a vehicle battery management system (BMS). Figure 2 As shown, the method includes the following steps:

[0031] Step S202: If the vehicle's full load current cannot be obtained, control the charging pile to charge the vehicle based on an initial charging request current, where the initial charging request current is determined based on the vehicle's battery. In the present invention, the vehicle may represent a battery-powered pure electric vehicle or hybrid vehicle. The vehicle's BMS sends a charging request current to the charging pile, and the charging pile charges the vehicle based on the charging request current. The charging process involves supplying power to the load via the vehicle's busbar and / or charging the vehicle's power battery via the busbar.

[0032] It should be noted that the initial charging request current can be determined based on the battery charging table (also known as the battery cell charging MAP table) preset in the vehicle's BMS. The battery charging table records the correspondence between the battery's SOC, temperature and other parameters under offline conditions and the charging current. Therefore, based on the vehicle's current power and temperature and other information, the vehicle's current initial charging request current can be determined by looking up the table, and the charging pile can be requested to use the initial charging request current to charge the vehicle.

[0033] In addition, when the BMS can obtain the vehicle's entire vehicle load current, the size of the charging current requested from the charging pile can be directly determined based on the entire vehicle load current. For example, the absolute value of the initial charging request current and the entire vehicle load current can be directly added to obtain the charging current used by the charging pile to charge the vehicle.

[0034] Step S204: After the charging pile charges the vehicle according to the initial charging request current, the vehicle's bus current is obtained. It should be noted that the magnitude and direction of the vehicle's bus current are the result of the combined effects of the charging current from the charging pile to the power battery and the vehicle's load power consumption. Therefore, based on the difference between the bus current and the initial charging request current, the vehicle's load power consumption can be estimated.

[0035] Step S206 determines a target charging request current based on the bus current and the initial charging request current. When the charging pile charges the vehicle based on the target charging request current, the actual charging current of the battery matches the initial charging request current. This step adjusts the current output by the charging pile so that it offsets the current consumption of the load when charging the vehicle. This allows the vehicle's power battery to receive the optimal charging current, allowing it to be fully charged as quickly as possible without overcharging, thereby improving the vehicle's charging efficiency.

[0036] Step S208: Control the charging pile to charge the vehicle based on the target charging request current.

[0037] Through the above steps, when the vehicle load current cannot be obtained, the charging pile is controlled to charge the vehicle based on the initial charging request current, wherein the initial charging request current is determined according to the battery of the vehicle; after the charging pile charges the vehicle according to the initial charging request current, the bus current of the vehicle is obtained; according to the bus current and the initial charging request current, the target charging request current is determined, wherein the actual charging current of the battery when the charging pile charges the vehicle according to the target charging request current matches the initial charging request current; the charging pile is controlled to charge the vehicle based on the target charging request current, thereby achieving the purpose of providing the optimal charging current for vehicles with uncertain loads, thereby realizing the technical effect of improving the charging efficiency of electric vehicles, and further solving the technical problem that the optimal charging efficiency cannot be achieved due to the power consumption of the vehicle load when charging electric vehicles.

[0038] As an optional embodiment, determining the target charging request current based on the bus current and the initial charging request current may include the following steps: determining the direction of the bus current as a charging direction or a discharging direction, wherein the charging direction indicates that the battery is in a charging state, and the discharging direction indicates that the battery is in a discharging state; when the direction of the bus current is a discharging direction, adding the absolute value of the bus current and the absolute value of the initial charging request current to generate a first compensation current; adding the first compensation current and the absolute value of the initial charging request current to generate a target charging request current, wherein the direction of the target charging request current is a charging direction.

[0039] It should be noted that the charging direction refers to the actual charging of the vehicle's battery, and the discharging direction refers to the actual discharging of the vehicle's battery. In the case of a particularly high power load, the charging pile may be charging the vehicle, but the bus current may be discharging. In other words, the current from the power battery and the charging pile are combined to power the load.

[0040] As an optional embodiment, the above method may further include the following steps: when the direction of the bus current is the charging direction, subtracting the absolute value of the bus current from the absolute value of the initial charging request current to generate a second compensation current; adding the second compensation current to the absolute value of the initial charging request current to generate a target charging request current, wherein the direction of the target charging request current is the charging direction.

[0041] As an optional embodiment, generating the target charging request current may further include the following steps: comparing the second compensation current with a current compensation threshold; and generating the target charging request current when the second compensation current is greater than the current compensation threshold. In this step, current compensation is performed only when the second compensation current is greater than the current compensation threshold, thereby avoiding charging instability caused by frequent activation of current compensation. When the second compensation current is less than or equal to the current compensation threshold, compensation for the initial charging request current is omitted, and the current charging state is maintained.

[0042] As an optional embodiment, controlling the charging pile to charge the vehicle based on a target charging request current includes the following steps: obtaining the maximum allowable output current of the charging pile; when the target charging request current is less than or equal to the maximum allowable output current, controlling the charging pile to charge the vehicle using the target charging request current; and when the target charging request current is greater than the maximum allowable output current, controlling the charging pile to charge the vehicle using the maximum allowable output current. This optional embodiment protects the charging pile and prevents charging failures caused by the vehicle's BMS repeatedly requesting a high current from the charging pile that the charging pile cannot provide.

[0043] As an optional embodiment, controlling the charging pile to charge the vehicle based on the target charging request current includes: obtaining the maximum allowable rate of current change of the charging pile; determining the current change rate request value based on the target charging request current and the initial charging request current; when the current change rate request value is greater than the maximum allowable rate of current change, controlling the output current of the charging pile to charge the vehicle to transition from the initial charging request current to the target charging request current according to the maximum allowable rate of current change; when the current change rate request value is less than or equal to the maximum allowable rate of current change, controlling the output current of the charging pile to charge the vehicle to transition from the initial charging request current to the target charging request current according to the current change rate request value. Through this optional embodiment, it is possible to avoid the situation where the vehicle requests the charging pile to make a rapid current change, while the current change speed of the charging pile cannot keep up with the vehicle's request, causing a malfunction in the charging process. When the step of the charging pile output current is too large, the output current of the charging pile needs to decrease slowly, so it is necessary to limit the current change slope of the charging pile to ensure that no malfunction occurs.

[0044] Figure 3 : is a flow chart of a method for determining a charging current according to an optional embodiment of the present invention. Figure 3 As shown, this optional implementation may include the following steps:

[0045] First, assume that the charge current is negative, the discharge current is positive, and the requested charge current is positive.

[0046] Step 3.1: The BMS implements the charging current lookup function in the software based on the cell charging MAP table, obtains the table lookup request current Ireq1, and simultaneously collects the bus current I;

[0047] Step 1): When the VCU provides the vehicle's current load consumption current signal, the BMS calculates the required charging current Icom1 = -Idis based on the current consumption current Idis. Therefore, the requested charging current after BMS compensation is Ireq3 = Ireq1 + Icom1.

[0048] Step 2) When the VCU does not provide the vehicle's current load consumption signal, and I>=0A during charging, it indicates that the vehicle is actually in a discharging state. Therefore, the charging current needs to be compensated: Icom2=(Ireq1+I). The compensated requested charging current is Ireq3=Ireq1+Icom2. When I<0A during charging, and abs(Ireq1-I)>threshold, the charging current does not match the requested current. Therefore, the charging current needs to be compensated: Icom3=(Ireq1-I). The compensated requested current is Ireq3=Ireq1+Icom3.

[0049] Step 3), considering the output capacity of the charging pile, assume the maximum allowable output current of the charging pile is Imax. When Ireq3 < Imax, the requested current finally output by the BMS is Ireq = Ireq3; otherwise, the requested current finally output by the BMS is Ireq = Imax. Combining with the response of the current charging pile to the slope of current change, the slope of change of Ireq is restricted to ensure that it can adapt to all charging piles.

[0050] Step 4), perform real-time diagnosis on the charging current. When abs(Ireq - I) / Ireq is within a reasonable range (this range can be confirmed according to actual applications), the finally output requested current is Ireq; otherwise, current correction is performed according to Steps 2), 3), and 4) to ensure that the charging current is within a reasonable range.

[0051] It should be noted that for the foregoing method embodiments, for the sake of simple description, they are all expressed as a series of action combinations. However, those skilled in the art should know that the present invention is not limited by the described action sequence, because according to the present invention, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to the present invention.

[0052] Through the description of the above embodiments, those skilled in the art can clearly understand that the vehicle charging method according to the above embodiments can be implemented by means of software plus a necessary general hardware platform. Of course, it can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions for causing a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods of the various embodiments of the present invention.

[0053] According to an embodiment of the present invention, there is also provided a vehicle charging device for implementing the above vehicle charging method. Figure 4 is a structural block diagram of the vehicle charging device provided according to an embodiment of the present invention, as Figure 4 shown. The vehicle charging device includes: a first request module 42, an acquisition module 44, a determination module 46, and a second request module 48. The vehicle charging device will be described below.

[0054] The first request module 42 is configured to control the charging pile to charge the vehicle based on an initial charging request current when the vehicle's overall vehicle load current cannot be obtained, where the initial charging request current is determined according to the vehicle's battery.

[0055] An acquisition module 44 is connected to the first request module 42 and is used to obtain the bus current of the vehicle after the charging pile charges the vehicle according to the initial charging request current;

[0056] a determination module 46 connected to the acquisition module 44 and configured to determine a target charging request current based on the bus current and the initial charging request current, wherein the actual charging current of the battery when the charging pile charges the vehicle based on the target charging request current matches the initial charging request current;

[0057] The second request module 48 is connected to the determination module 46 and is used to control the charging pile to charge the vehicle based on the target charging request current.

[0058] It should be noted that the first request module 42, acquisition module 44, determination module 46, and second request module 48 described above correspond to steps S202 to S208 in the embodiment. The examples and application scenarios implemented by these modules and corresponding steps are the same, but are not limited to those disclosed in the embodiment. It should be noted that the above modules, as part of the device, can be run in the computer terminal 10 provided in the embodiment.

[0059] According to another aspect of an embodiment of the present invention, a battery management system is provided, which is configured to run a program to execute any of the above-described vehicle charging methods. The battery management system is a system that operates in a vehicle, which can be a pure electric vehicle or a hybrid vehicle.

[0060] An embodiment of the present invention may provide a computer device. Optionally, in this embodiment, the computer device may be located in at least one of a plurality of network devices in a computer network. The computer device includes a memory and a processor.

[0061] The memory can be used to store software programs and modules, such as the program instructions / modules corresponding to the vehicle charging method and device in the embodiments of the present invention. The processor executes the software programs and modules stored in the memory to perform various functional applications and data processing, thereby implementing the above-mentioned vehicle charging method. The memory may include high-speed random access memory and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory may further include a memory remotely located relative to the processor, and these remote memories may be connected to the computer terminal via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0062] The processor can call the information and application stored in the memory through the transmission device to perform the following steps: when the vehicle's entire load current cannot be obtained, control the charging pile to charge the vehicle based on the initial charging request current, wherein the initial charging request current is determined according to the vehicle's battery; after the charging pile charges the vehicle according to the initial charging request current, obtain the bus current of the vehicle; determine the target charging request current based on the bus current and the initial charging request current, wherein the actual charging current of the battery when the charging pile charges the vehicle according to the target charging request current matches the initial charging request current; control the charging pile to charge the vehicle based on the target charging request current.

[0063] Optionally, the processor may also execute the program code of the following steps: determining a target charging request current based on the bus current and the initial charging request current, including: determining whether the direction of the bus current is a charging direction or a discharging direction, wherein the charging direction indicates that the battery is in a charging state, and the discharging direction indicates that the battery is in a discharging state; when the direction of the bus current is a discharging direction, adding the absolute value of the bus current and the absolute value of the initial charging request current to generate a first compensation current; adding the first compensation current and the absolute value of the initial charging request current to generate a target charging request current, wherein the direction of the target charging request current is a charging direction.

[0064] Optionally, the above-mentioned processor can also execute the program code of the following steps: when the direction of the bus current is the charging direction, subtract the absolute value of the bus current from the absolute value of the initial charging request current to generate a second compensation current; add the second compensation current to the absolute value of the initial charging request current to generate a target charging request current, wherein the direction of the target charging request current is the charging direction.

[0065] Optionally, the processor may further execute program code of the following steps: generating a target charging request current, including: comparing the second compensation current with a current compensation threshold; and generating a target charging request current when the second compensation current is greater than the current compensation threshold.

[0066] Optionally, the processor may also execute the program code of the following steps: controlling the charging pile to charge the vehicle based on the target charging request current, including: obtaining the maximum allowable output current of the charging pile; when the target charging request current is less than or equal to the maximum allowable output current, controlling the charging pile to charge the vehicle using the target charging request current; when the target charging request current is greater than the maximum allowable output current, controlling the charging pile to charge the vehicle using the maximum allowable output current.

[0067] Optionally, the processor may also execute the program code of the following steps: controlling the charging pile to charge the vehicle based on the target charging request current, including: obtaining the maximum allowable rate of current change of the charging pile; determining the current change rate request value based on the target charging request current and the initial charging request current; when the current change rate request value is greater than the maximum allowable rate of current change, controlling the output current of the charging pile to charge the vehicle to transition from the initial charging request current to the target charging request current according to the maximum allowable rate of current change; when the current change rate request value is less than or equal to the maximum allowable rate of current change, controlling the output current of the charging pile to charge the vehicle to transition from the initial charging request current to the target charging request current according to the current change rate request value.

[0068] A person skilled in the art will understand that all or part of the steps in the various methods of the above embodiments can be completed by instructing the hardware related to the terminal device through a program, and the program can be stored in a non-volatile storage medium, which may include: a flash drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0069] The embodiment of the present invention further provides a non-volatile storage medium. Optionally, in this embodiment, the non-volatile storage medium can be used to store the program code executed by the vehicle charging method provided in the above embodiment.

[0070] Optionally, in this embodiment, the non-volatile storage medium may be located in any computer terminal in a computer terminal group in a computer network, or in any mobile terminal in a mobile terminal group.

[0071] Optionally, in this embodiment, the non-volatile storage medium is configured to store program code for performing the following steps: in a case where the vehicle's full vehicle load current cannot be obtained, controlling the charging pile to charge the vehicle based on an initial charging request current, wherein the initial charging request current is determined based on the vehicle's battery; after the charging pile charges the vehicle based on the initial charging request current, obtaining the vehicle's bus current; determining a target charging request current based on the bus current and the initial charging request current, wherein the actual charging current of the battery matches the initial charging request current when the charging pile charges the vehicle based on the target charging request current; and controlling the charging pile to charge the vehicle based on the target charging request current.

[0072] Optionally, in this embodiment, the non-volatile storage medium is configured to store program code for performing the following steps: determining a target charging request current based on the bus current and the initial charging request current, including: determining whether the direction of the bus current is a charging direction or a discharging direction, wherein the charging direction indicates that the battery is in a charging state, and the discharging direction indicates that the battery is in a discharging state; when the direction of the bus current is a discharging direction, adding the absolute value of the bus current and the absolute value of the initial charging request current to generate a first compensation current; adding the first compensation current to the absolute value of the initial charging request current to generate a target charging request current, wherein the direction of the target charging request current is a charging direction.

[0073] Optionally, in this embodiment, the non-volatile storage medium is configured to store program code for performing the following steps: when the direction of the bus current is the charging direction, subtracting the absolute value of the bus current from the absolute value of the initial charging request current to generate a second compensation current; adding the second compensation current to the absolute value of the initial charging request current to generate a target charging request current, wherein the direction of the target charging request current is the charging direction.

[0074] Optionally, in this embodiment, the non-volatile storage medium is configured to store program code for performing the following steps: generating a target charging request current, including: comparing the second compensation current with the current compensation threshold; and generating a target charging request current when the second compensation current is greater than the current compensation threshold.

[0075] Optionally, in this embodiment, the non-volatile storage medium is configured to store program code for executing the following steps: controlling the charging pile to charge the vehicle based on the target charging request current, including: obtaining the maximum allowable output current of the charging pile; when the target charging request current is less than or equal to the maximum allowable output current, controlling the charging pile to charge the vehicle with the target charging request current; when the target charging request current is greater than the maximum allowable output current, controlling the charging pile to charge the vehicle with the maximum allowable output current.

[0076] Optionally, in this embodiment, the non-volatile storage medium is configured to store program code for executing the following steps: controlling the charging pile to charge the vehicle based on the target charging request current, including: obtaining the maximum allowable rate of current change of the charging pile; determining the current change rate request value based on the target charging request current and the initial charging request current; when the current change rate request value is greater than the maximum allowable rate of current change, controlling the output current of the charging pile to charge the vehicle to transition from the initial charging request current to the target charging request current according to the maximum allowable rate of current change; when the current change rate request value is less than or equal to the maximum allowable rate of current change, controlling the output current of the charging pile to charge the vehicle to transition from the initial charging request current to the target charging request current according to the current change rate request value.

[0077] The serial numbers of the above embodiments of the present invention are for description only and do not represent the advantages or disadvantages of the embodiments.

[0078] In the above embodiments of the present invention, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0079] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only exemplary. For example, the division of units can be a logical function division. There can be other division methods when achieving the goal. For example, multiple units or components can be combined or integrated into another system, 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 units or modules, which can be electrical or other forms.

[0080] Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, i.e., they may be located in one place or distributed across multiple units. Some or all of the units may be selected to achieve the purpose of this embodiment according to the desired objectives.

[0081] In addition, the functional units in the various embodiments of the present invention may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0082] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a non-volatile storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server or network device, etc.) to execute all or part of the steps of the various embodiments of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk, and other media that can store program codes.

[0083] The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A vehicle charging method, characterized in that: include: In the case where the vehicle load current cannot be obtained, controlling the charging pile to charge the vehicle based on an initial charging request current, wherein the initial charging request current is determined according to the battery of the vehicle; After the charging pile charges the vehicle according to the initial charging request current, obtaining a bus current of the vehicle; determining a target charging request current according to the bus current and the initial charging request current, wherein an actual charging current of the battery when the charging pile charges the vehicle according to the target charging request current matches the initial charging request current; The charging pile is controlled to charge the vehicle based on the target charging request current.

2. The method according to claim 1, characterized in that The determining a target charging request current according to the bus current and the initial charging request current includes: determining whether the direction of the bus current is a charging direction or a discharging direction, wherein the charging direction indicates that the battery is in a charging state, and the discharging direction indicates that the battery is in a discharging state; When the direction of the bus current is a discharging direction, adding the absolute value of the bus current and the absolute value of the initial charge request current to generate a first compensation current; The first compensation current is added to the absolute value of the initial charging request current to generate the target charging request current, wherein the direction of the target charging request current is a charging direction.

3. The method according to claim 2, characterized in that Also includes: When the direction of the bus current is a charging direction, subtracting the absolute value of the bus current from the absolute value of the initial charging request current to generate a second compensation current; The second compensation current is added to the absolute value of the initial charge request current to generate the target charge request current, wherein the direction of the target charge request current is a charging direction.

4. The method according to claim 3, characterized in that The generating the target charging request current includes: comparing the second compensation current with a current compensation threshold; In a case where the second compensation current is greater than the current compensation threshold, the target charging request current is generated.

5. The method according to claim 1, wherein The controlling the charging pile to charge the vehicle based on the target charging request current includes: Obtaining the maximum allowable output current of the charging pile; When the target charging request current is less than or equal to the maximum allowable output current, controlling the charging pile to charge the vehicle with the target charging request current; When the target charging request current is greater than the maximum allowable output current, the charging pile is controlled to charge the vehicle using the maximum allowable output current.

6. The method according to any one of claims 1 to 5, characterized in that The controlling the charging pile to charge the vehicle based on the target charging request current includes: Obtaining a maximum allowable rate of change of current of the charging pile; determining a current change rate request value according to the target charging request current and the initial charging request current; When the current change rate request value is greater than the maximum allowable current change rate, controlling the output current of the charging pile for charging the vehicle to transition from the initial charging request current to the target charging request current according to the maximum allowable current change rate; When the current change rate request value is less than or equal to the maximum allowable current change rate, the output current of the charging pile for charging the vehicle is controlled to transition from the initial charging request current to the target charging request current according to the current change rate request value.

7. A vehicle charging device, characterized in that: include: a first request module, configured to control a charging pile to charge the vehicle based on an initial charging request current when the vehicle load current cannot be obtained, wherein the initial charging request current is determined according to a battery of the vehicle; an acquisition module, configured to acquire a bus current of the vehicle after the charging pile charges the vehicle according to the initial charging request current; a determination module, configured to determine a target charging request current based on the bus current and the initial charging request current, wherein an actual charging current of the battery when the charging pile charges the vehicle based on the target charging request current matches the initial charging request current; The second request module is configured to control the charging pile to charge the vehicle based on the target charging request current.

8. A battery management system, characterized in that: The battery management system is configured to run a program to execute the vehicle charging method according to any one of claims 1 to 6.

9. A non-volatile storage medium, characterized in that: The non-volatile storage medium includes a stored program, wherein when the program is executed, the device where the non-volatile storage medium is located is controlled to execute the vehicle charging method according to any one of claims 1 to 6.

10. A computer device, characterized in that: The computer device includes a memory and a processor, the memory is used to store a program, and the processor is used to run the program stored in the memory, wherein the vehicle charging method according to any one of claims 1 to 6 is executed when the program is run.

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