Discharge control method, device, equipment and storage medium based on V2G

Abstract

The present application discloses a discharge control method, device, equipment and storage medium based on V2G. The discharge control method based on V2G includes: obtaining the maximum allowable discharge current of the vehicle according to the maximum allowable discharge current of the battery and the consumption current of the vehicle; determining the maximum allowable discharge current of the charging pile according to the maximum allowable discharge current of the vehicle and the maximum discharge current of the charging pile; searching the discharge coefficient corresponding to the temperature of the charging port from a preset mapping table; determining the target discharge current according to the maximum allowable discharge current of the charging pile and the discharge coefficient; discharging the charging pile according to the target discharge current. The technical solution of the present application can improve the stability and safety of the V2G discharge process.

Description

Technical Field

[0001] The present application belongs to the field of V2G technology, and in particular, relates to a V2G-based discharge control method, device, equipment and storage medium. Background Art

[0002] With the development of new energy technologies, the technology of transmitting electricity from electric vehicles to the grid (Vehicle to Grid, V2G) has received widespread attention. By using electric vehicles as power sources to discharge to charging piles, energy conversion between electric vehicles and the grid is achieved, making a significant contribution to the regulation and stability of the grid.

[0003] Usually, the maximum discharge current of a charging pile is calibrated when it leaves the factory. Therefore, when an electric vehicle discharges from a charging pile, the discharge current only needs to be less than the maximum discharge current. This solution can easily lead to an unstable and unsafe discharge process. Summary of the invention

[0004] The embodiments of the present application provide a V2G-based discharge control method, apparatus, device, and storage medium, thereby improving the stability and safety of the V2G discharge process.

[0005] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by the practice of the present application.

[0006] According to a first aspect of an embodiment of the present application, a V2G-based discharge control method is provided, which is applied to a vehicle, wherein the vehicle includes a battery and a charging port for connecting to a charging pile, and the V2G-based discharge control method includes:

[0007] Obtaining a maximum allowable discharge current of the vehicle according to a maximum allowable discharge current of the battery and a consumption current of the vehicle;

[0008] Determining the maximum allowable discharge current of the charging pile according to the maximum allowable discharge current of the vehicle and the maximum discharge current of the charging pile;

[0009] Finding a discharge coefficient corresponding to the temperature of the charging port from a preset mapping table;

[0010] Determining a target discharge current according to the maximum allowable discharge current of the charging pile and the discharge coefficient;

[0011] The charging pile is discharged according to the target discharge current.

[0012] In some embodiments of the present application, based on the above solution, the maximum allowable discharge current of the vehicle is obtained according to the maximum allowable discharge current of the battery and the consumption current of the vehicle, including:

[0013] Obtaining the maximum allowable discharge current of the battery from a discharge power table of the battery;

[0014] Obtaining a consumption current of the vehicle according to the consumption power of the vehicle and the current voltage of the battery;

[0015] The difference between the maximum allowable discharge current of the battery and the consumption current of the vehicle is determined as the maximum allowable discharge current of the vehicle.

[0016] In some embodiments of the present application, based on the above solution, determining the maximum allowable discharge current of the charging pile according to the maximum allowable discharge current of the vehicle and the maximum discharge current of the charging pile includes:

[0017] Obtain the maximum limit discharge current of the charging pile specified by the national standard;

[0018] The minimum value among the maximum allowable discharge current of the vehicle, the maximum discharge current of the charging pile and the maximum limit discharge current is determined as the maximum allowable discharge current of the charging pile.

[0019] In some embodiments of the present application, based on the above solution, before discharging the charging pile according to the target discharge current, the method further includes:

[0020] Obtaining an upper voltage limit and a lower voltage limit of the charging pile;

[0021] When the current voltage of the battery is greater than the voltage upper limit or less than the voltage lower limit, the discharging prohibition information is output; otherwise, the step of discharging the charging pile according to the target discharging current is executed.

[0022] In some embodiments of the present application, based on the above solution, after discharging the charging pile according to the target discharge current, the method further includes:

[0023] Obtaining a discharge control instruction and the current remaining power of the battery;

[0024] When the current voltage, the discharge control instruction or the current remaining power meets a preset condition, discharging the charging pile is stopped.

[0025] In some embodiments of the present application, based on the above solution, after discharging the charging pile according to the target discharge current, the method further includes:

[0026] Obtaining a current discharge current of the charging pile and a current discharge current of the battery;

[0027] Subtract the consumption current and the current discharge current of the charging pile from the current discharge current of the battery to obtain a current difference;

[0028] When the current difference is greater than a preset value for a first preset time, discharging the charging pile is stopped.

[0029] In some embodiments of the present application, based on the above solution, after discharging the charging pile according to the target discharge current, the method further includes:

[0030] Obtaining the minimum discharge current of the charging pile and the current discharge current of the battery;

[0031] When the difference between the current discharge current of the battery and the consumption current is less than or equal to the minimum discharge current for a second preset time, discharging the charging pile is stopped.

[0032] According to a second aspect of an embodiment of the present application, a V2G-based discharge control device is provided, which is applied to a vehicle, wherein the vehicle includes a battery and a charging port for connecting to a charging pile, and the V2G-based discharge control device includes:

[0033] A vehicle-end discharge current determination unit, configured to obtain a maximum allowable discharge current of the vehicle according to a maximum allowable discharge current of the battery and a consumption current of the vehicle;

[0034] A pile end discharge current determination unit, used to determine the maximum allowable discharge current of the charging pile according to the maximum allowable discharge current of the vehicle and the maximum discharge current of the charging pile;

[0035] a discharge coefficient determination unit, configured to search a preset mapping table for a discharge coefficient corresponding to the temperature of the charging port;

[0036] a target discharge current determination unit, configured to determine a target discharge current according to a maximum allowable discharge current of the charging pile and the discharge coefficient;

[0037] A discharge unit is used to discharge the charging pile according to the target discharge current.

[0038] According to a third aspect of an embodiment of the present application, a V2G-based discharge control device is provided. The V2G-based discharge control device includes a memory and a processor. The memory stores a computer program. When the processor executes the computer program, the steps of the above method are implemented.

[0039] According to a fourth aspect of an embodiment of the present application, a computer-readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the above method are implemented.

[0040] In the present application, the maximum allowable discharge current of the vehicle is obtained according to the maximum allowable discharge current of the battery and the consumption current of the vehicle; the maximum allowable discharge current of the charging pile is determined according to the maximum allowable discharge current of the vehicle and the maximum discharge current of the charging pile; the discharge coefficient corresponding to the temperature of the charging port is searched from a preset mapping table; the target discharge current is determined according to the maximum allowable discharge current of the charging pile and the discharge coefficient; the charging pile is discharged according to the target discharge current, thereby improving the stability and safety of the V2G discharge process.

[0041] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0043] Figure 1 is an application environment diagram of a V2G-based discharge control method in one embodiment;

[0044] Figure 2 is a flow chart of a V2G-based discharge control method in one embodiment;

[0045] Figure 3 is a flow chart of a discharge control method based on V2G in another embodiment;

[0046] Figure 4 is a flow chart of a V2G-based discharge control method in yet another embodiment;

[0047] Figure 5 is a flow chart of a V2G-based discharge control method in yet another embodiment;

[0048] Figure 6 is a flow chart of a V2G-based discharge control method in yet another embodiment;

[0049] Figure 7 is a structural block diagram of a V2G-based discharge control device in one embodiment;

[0050] Figure 8 FIG. 4 is an internal structure diagram of a V2G-based discharge control device in one embodiment. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0052] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present application. However, those skilled in the art will appreciate that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, known methods, devices, realizations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0053] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0054] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0055] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application 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 objects used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those shown or described.

[0056] The V2G-based discharge control method provided in the embodiment of the present application can be applied to Figure 1 In the application environment shown, when the electric vehicle 102 is connected to the charging pile 104, not only the electric vehicle 102 can be charged, but also the electric vehicle 102 can be discharged, that is, the electric energy of the power battery in the electric vehicle 102 is released to participate in the grid load regulation.

[0057] In one embodiment, Figure 2As shown, a discharge control method based on V2G is provided, and the method is applied to Figure 1 Taking the vehicle in the example as an example, the vehicle includes a battery and a charging port for connecting to a charging pile. The method may include the following steps:

[0058] Step 201, obtaining the maximum allowable discharge current of the vehicle according to the maximum allowable discharge current of the battery and the current consumption of the vehicle.

[0059] Among them, the current consumption refers to the current consumed by the vehicle's high-voltage accessories such as the air conditioner, the DC transformer, etc.

[0060] Specifically, the vehicle can calculate the maximum allowable discharge current of the vehicle based on the difference between the maximum allowable discharge current of the battery and the current consumption of the vehicle. In one example, the vehicle can obtain the maximum allowable discharge current of the battery from the battery discharge power table; obtain the vehicle consumption current based on the vehicle consumption power and the current voltage of the battery; and determine the difference between the maximum allowable discharge current of the battery and the current consumption of the vehicle as the maximum allowable discharge current of the vehicle.

[0061] It should be understood that a battery discharge power meter is usually stored in the vehicle, and the discharge power meter records the discharge current values ​​corresponding to different cell voltages and different temperature conditions. Therefore, the maximum allowable discharge current of the vehicle can be determined based on the discharge power meter.

[0062] In addition, according to the power calculation formula P=UI, the vehicle's current consumption can be obtained by dividing the vehicle's power consumption by the current voltage of the battery. Therefore, the vehicle's current consumption can be obtained based on the vehicle's power consumption and the current voltage of the battery.

[0063] Step 202: Determine the maximum allowable discharge current of the charging pile according to the maximum allowable discharge current of the vehicle and the maximum discharge current of the charging pile.

[0064] It should be understood that the maximum discharge current of the charging pile will be calibrated when it leaves the factory. The vehicle can obtain the maximum discharge current of the charging pile by communicating with the charging pile, and then select the smaller value between the maximum allowable discharge current of the vehicle and the maximum discharge current of the charging pile as the maximum allowable discharge current of the charging pile.

[0065] In other examples, the vehicle may also obtain the maximum limited discharge current of the charging pile specified by the national standard; and determine the minimum value among the maximum allowable discharge current of the vehicle, the maximum discharge current of the charging pile, and the maximum limited discharge current as the maximum allowable discharge current of the charging pile.

[0066] The national standard GB / T 18487.1-2015 takes into account the current carrying capacity of the cable and the charging seat during fast charging, and stipulates that the maximum discharge current limit of the charging pile is 250A. Therefore, when the vehicle discharges the charging pile, the discharge current needs to be less than 250A. This embodiment comprehensively considers the discharge capacity of the vehicle end, the discharge capacity of the pile end, and the restrictions of the national standard, and takes the minimum value of the three to comprehensively calculate the maximum allowable discharge current of the charging pile, thereby improving the safety of discharge.

[0067] Step 203: Look up the discharge coefficient corresponding to the temperature of the charging port from a preset mapping table.

[0068] Taking into account the overheating problem of the charging port during the discharge process, it is necessary to perform derating discharge, so it is necessary to determine the discharge coefficient of the discharge current. In one example, different discharge coefficients corresponding to different temperatures can be recorded in the preset mapping table. For example, when the temperature of the charging port is less than 93°C, the discharge coefficient is 1.0; when the temperature of the charging port is between 95°C and 105°C, the discharge coefficient is 0.8; when the temperature of the charging port is between 108°C and 119°C, the discharge coefficient is 0.5; when the temperature of the charging port exceeds 120°C, the overtemperature shutdown occurs and the discharge current coefficient is 0. In this way, after obtaining the temperature of the charging port, the corresponding discharge coefficient can be obtained by looking up the table based on the temperature.

[0069] Step 204: determine the target discharge current according to the maximum allowable discharge current and the discharge coefficient of the charging pile.

[0070] Specifically, the target discharge current can be obtained according to the maximum allowable discharge current and discharge coefficient of the charging pile and a preset formula. There can be multiple preset formulas. In one example, the maximum allowable discharge current of the charging pile can be directly multiplied by the discharge coefficient to obtain the target discharge current.

[0071] Step 205, discharging the charging pile according to the target discharge current.

[0072] It should be understood that by using the target discharge current calculated by the discharge coefficient to discharge the charging pile at a reduced rate, the charging port can be effectively prevented from overheating, thereby improving the safety of discharge.

[0073] This embodiment obtains the maximum allowable discharge current of the vehicle based on the maximum allowable discharge current of the battery and the consumption current of the vehicle; determines the maximum allowable discharge current of the charging pile based on the maximum allowable discharge current of the vehicle and the maximum discharge current of the charging pile; searches for the discharge coefficient corresponding to the temperature of the charging port from a preset mapping table; determines the target discharge current based on the maximum allowable discharge current and discharge coefficient of the charging pile; and discharges the charging pile based on the target discharge current. Among them, the target discharge current is calculated by comprehensively considering factors such as the discharge capacity of the battery, the consumption of the whole vehicle, the discharge capacity of the charging pile, and the temperature of the charging port, and the charging pile is discharged using the calculated target discharge current, thereby ensuring the stability and safety of the discharge process.

[0074] Figure 3 FIG. 1 is a flow chart of a discharge control method based on V2G in another embodiment. Figure 3 As shown, the V2G-based discharge control method may further include the following steps:

[0075] Step 301, obtaining the voltage upper limit value and the voltage lower limit value of the charging pile;

[0076] Step 302: when the current voltage of the battery is greater than the upper voltage limit or less than the lower voltage limit, output the discharging prohibition information; otherwise, execute the step of discharging the charging pile according to the target discharging current.

[0077] It should be understood that before entering the discharge process, it is necessary to first check whether the current voltage of the battery on the vehicle side matches the voltage range of the charging pile. The vehicle communicates with the charging pile to obtain the voltage upper limit and voltage lower limit of the charging pile. If the current voltage of the battery is higher than the voltage upper limit of the charging pile, or the current voltage of the battery is lower than the voltage lower limit of the charging pile, the vehicle side determines that the vehicle-pile voltage does not match, and outputs a discharge prohibition message to prohibit entering the discharge process. If the current voltage of the battery is between the voltage upper limit and the voltage lower limit, the discharge process is entered.

[0078] This embodiment improves the discharge efficiency by checking whether the current voltage of the battery at the vehicle end matches the voltage range of the charging pile and adopting different discharge strategies according to the matching conditions.

[0079] Figure 4 FIG. 4 is a flow chart of a discharge control method based on V2G in another embodiment. Figure 4 As shown, the V2G-based discharge control method may further include the following steps:

[0080] Step 401, obtaining a discharge control instruction and the current remaining power of the battery;

[0081] Step 402, when the current voltage, the discharge control instruction or the current remaining power meets the preset conditions, stop discharging the charging pile.

[0082] The discharge control instruction refers to an instruction to start or end discharge issued by the user through a fixed operation at the pile end or the vehicle end. For example, the user can issue an instruction to actively end the discharge process by swiping a card at the pile end.

[0083] Specifically, after entering the discharge process, when the current voltage is less than or equal to the lower voltage limit of the charging pile, or reaches the single cell voltage value at which discharge is cut off, the vehicle end stops the discharge process; when the discharge control instruction is to end the discharge process, the vehicle end stops the discharge process; when the current remaining power reaches the discharge cut off condition, for example, 10%, the vehicle end stops the discharge process.

[0084] This embodiment stops discharging the charging pile when the current voltage, discharge control instruction or current remaining power meets preset conditions, thereby achieving real-time control of the discharge process according to the vehicle situation and improving the stability of the discharge process.

[0085] Figure 5 FIG. 4 is a flow chart of a discharge control method based on V2G in another embodiment. Figure 5 As shown, the V2G-based discharge control method may further include the following steps:

[0086] Step 501, obtaining the current discharge current of the charging pile and the current discharge current of the battery;

[0087] Step 502, subtract the current consumption current and the current discharge current of the charging pile from the current discharge current of the battery in sequence to obtain a current difference;

[0088] Step 503: When the current difference is greater than a preset value for a first preset time, the charging pile is stopped from being discharged.

[0089] It should be understood that the vehicle side can monitor the current discharge current of the battery in real time, and the charging pile also detects the current discharge current of the pile side and sends it to the vehicle side through the fast charging bus. When the current difference is greater than the preset value for the first preset time, the vehicle side determines that it is a discharge overcurrent and ends the discharge process. Taking the first preset time as 5s and the preset value as 5A as an example, if the current difference is greater than 5A and lasts for 5s, the discharge process ends.

[0090] This embodiment implements discharge overcurrent protection for the battery at the vehicle end during the discharge process, thereby ensuring the safety of the discharge process.

[0091] Figure 6 FIG. 4 is a flow chart of a discharge control method based on V2G in another embodiment. Figure 6As shown, the V2G-based discharge control method may further include the following steps:

[0092] Step 601, obtaining the minimum discharge current of the charging pile and the current discharge current of the battery;

[0093] Step 602: When the difference between the current discharge current of the battery and the consumption current is less than or equal to the minimum discharge current for a second preset time, stop discharging the charging pile.

[0094] Considering that during the discharge process, when the remaining power of the battery is low, the discharge capacity of the battery will also decrease. The vehicle end can communicate with the charging pile to obtain the minimum discharge current of the charging pile, and when the difference between the current discharge current of the battery and the consumption current is less than or equal to the minimum discharge current for a second preset time, it is determined that the minimum discharge capacity limit of the pile end has been reached, and the discharge process ends. Taking the second preset time of 5s as an example, when the difference is less than or equal to the minimum discharge current and lasts for 5s, the discharge process ends.

[0095] This embodiment realizes timely termination of the discharge process after the discharge capacity of the battery is reduced to a level that cannot meet the demand during the discharge process, thereby ensuring the stability of the discharge process.

[0096] It should be understood that, although the steps in the flowcharts involved in the above embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above embodiments may include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0097] Based on the same inventive concept, the embodiment of the present application also provides a V2G-based discharge control device, which is applied to a vehicle, wherein the vehicle includes a battery and a charging port for connecting to a charging pile, such as Figure 7As shown, the V2G-based discharge control device includes: a vehicle-side discharge current determination unit 701, which is used to obtain the maximum allowable discharge current of the vehicle according to the maximum allowable discharge current of the battery and the consumption current of the vehicle; a pile-side discharge current determination unit 702, which is used to determine the maximum allowable discharge current of the charging pile according to the maximum allowable discharge current of the vehicle and the maximum discharge current of the charging pile; a discharge coefficient determination unit 703, which is used to find the discharge coefficient corresponding to the temperature of the charging port from a preset mapping table; a target discharge current determination unit 704, which is used to determine the target discharge current according to the maximum allowable discharge current and the discharge coefficient of the charging pile; a discharge unit 705, which is used to discharge the charging pile according to the target discharge current.

[0098] In some embodiments of the present application, based on the aforementioned scheme, the vehicle-end discharge current determination unit 701 is also used to obtain the maximum allowable discharge current of the battery from the battery discharge power table; obtain the vehicle consumption current according to the vehicle's power consumption and the current voltage of the battery; and determine the difference between the maximum allowable discharge current of the battery and the vehicle's consumption current as the maximum allowable discharge current of the vehicle.

[0099] In some embodiments of the present application, based on the aforementioned scheme, the pile end discharge current determination unit 702 is also used to obtain the maximum limit discharge current of the charging pile specified in the national standard; and the minimum value among the maximum allowable discharge current of the vehicle, the maximum discharge current of the charging pile and the maximum limit discharge current is determined as the maximum allowable discharge current of the charging pile.

[0100] In some embodiments of the present application, based on the aforementioned scheme, the V2G-based discharge control device also includes: a discharge protection unit (not shown), which is used to obtain the voltage upper limit and voltage lower limit of the charging pile; when the current voltage of the battery is greater than the voltage upper limit, or less than the voltage lower limit, outputs a discharge prohibition information, otherwise, executes the step of discharging the charging pile according to the target discharge current.

[0101] In some embodiments of the present application, based on the aforementioned scheme, the discharge protection unit is also used to obtain the discharge control instruction and the current remaining power of the battery; when the current voltage, the discharge control instruction or the current remaining power meets the preset conditions, the discharge of the charging pile is stopped.

[0102] In some embodiments of the present application, based on the aforementioned scheme, the discharge protection unit is also used to obtain the current discharge current of the charging pile and the current discharge current of the battery; subtract the consumption current and the current discharge current of the charging pile from the current discharge current of the battery in turn to obtain the current difference; when the current difference continues to be greater than a preset value for a first preset time, stop discharging the charging pile.

[0103] In some embodiments of the present application, based on the aforementioned scheme, the discharge protection unit is also used to obtain the minimum discharge current of the charging pile and the current discharge current of the battery; when the difference between the current discharge current of the battery and the consumption current is less than or equal to the minimum discharge current for a second preset time, the discharging of the charging pile is stopped.

[0104] Each module in the above-mentioned V2G-based discharge control device can be implemented in whole or in part by software, hardware, or a combination thereof. Each of the above-mentioned modules can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute the operations corresponding to each of the above modules.

[0105] Based on the same inventive concept, an embodiment of the present application also provides a V2G-based discharge control device. Figure 8 FIG. 1 is an internal structure diagram of a V2G-based discharge control device in an embodiment. Figure 8 As shown, the V2G-based discharge control device includes one or more memories 804, one or more processors 802, and at least one computer program (program code) stored in the memory 804 and executable on the processor 802. When the processor 802 executes the computer program, the V2G-based discharge control method as described above is implemented.

[0106] Among them, Figure 8 In the embodiment of the present invention, a bus architecture (represented by bus 800) is shown, which may include any number of interconnected buses and bridges, and bus 800 links various circuits including one or more processors represented by processor 802 and memory represented by memory 804. Bus 800 may also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and are therefore not further described herein. Bus interface 805 provides an interface between bus 800 and receiver 801 and transmitter 803. Receiver 801 and transmitter 803 may be the same element, namely a transceiver, providing a unit for communicating with various other devices over a transmission medium. Processor 802 is responsible for managing bus 800 and general processing, while memory 804 may be used to store data used by processor 802 when performing operations.

[0107] Those skilled in the art will understand that Figure 8 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the V2G-based discharge control device to which the solution of the present application is applied. The specific V2G-based discharge control device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0108] Based on the same inventive concept, the embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the following steps are implemented:

[0109] According to the maximum allowable discharge current of the battery and the consumption current of the vehicle, the maximum allowable discharge current of the vehicle is obtained;

[0110] Determine the maximum allowable discharge current of the charging pile based on the maximum allowable discharge current of the vehicle and the maximum discharge current of the charging pile;

[0111] Find the discharge coefficient corresponding to the temperature of the charging port from the preset mapping table;

[0112] Determine the target discharge current based on the maximum allowable discharge current and discharge coefficient of the charging pile;

[0113] The charging pile is discharged according to the target discharge current.

[0114] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: obtaining the maximum allowable discharge current of the battery from the battery discharge power table; obtaining the vehicle consumption current based on the vehicle's power consumption and the current voltage of the battery; and determining the difference between the maximum allowable discharge current of the battery and the vehicle's consumption current as the maximum allowable discharge current of the vehicle.

[0115] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: obtaining the maximum limited discharge current of the charging pile specified in the national standard; and determining the minimum value among the maximum allowable discharge current of the vehicle, the maximum discharge current of the charging pile and the maximum limited discharge current as the maximum allowable discharge current of the charging pile.

[0116] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: obtaining the voltage upper limit and voltage lower limit of the charging pile; when the current voltage of the battery is greater than the voltage upper limit, or less than the voltage lower limit, outputting a discharge prohibition message, otherwise, executing the step of discharging the charging pile according to the target discharge current.

[0117] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: obtaining a discharge control instruction and the current remaining power of the battery; and stopping discharging the charging pile when the current voltage, the discharge control instruction or the current remaining power meets preset conditions.

[0118] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: obtaining the current discharge current of the charging pile and the current discharge current of the battery; subtracting the consumption current and the current discharge current of the charging pile from the current discharge current of the battery in turn to obtain a current difference; when the current difference continues to be greater than a preset value for a first preset time, stopping discharging the charging pile.

[0119] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: obtaining the minimum discharge current of the charging pile and the current discharge current of the battery; when the difference between the current discharge current of the battery and the consumption current is less than or equal to the minimum discharge current for a second preset time, stopping discharging the charging pile.

[0120] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored as one or more instructions or codes on a computer-readable medium or transmitted via a computer-readable medium. Other examples and implementations are within the scope and spirit of the present application and the appended claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hard wiring, or a combination of any of these. In addition, each functional unit may be integrated into a processing unit, each unit may exist physically separately, or two or more units may be integrated into one unit.

[0121] 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 schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. 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.

[0122] The units described as separate components may or may not be physically separated, and the components of the control device may or may not be physical units, that is, they may be located in one place or distributed in multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0123] 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 computer-readable storage medium. Based on this understanding, the technical solution of the present application, in essence, 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, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, disk or optical disk and other media that can store program codes.

[0124] The above description is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of the claims of the present application.

Claims

1. A discharge control method based on V2G, applied to a vehicle, wherein the vehicle comprises a battery and a charging port for connecting to a charging pile, characterized in that: The V2G-based discharge control method includes: Obtaining a maximum allowable discharge current of the vehicle according to a maximum allowable discharge current of the battery and a consumption current of the vehicle; Determining the maximum allowable discharge current of the charging pile according to the maximum allowable discharge current of the vehicle and the maximum discharge current of the charging pile; Finding a discharge coefficient corresponding to the temperature of the charging port from a preset mapping table; Determining a target discharge current according to the maximum allowable discharge current of the charging pile and the discharge coefficient; The charging pile is discharged according to the target discharge current.

2. The V2G-based discharge control method according to claim 1, characterized in that: The obtaining the maximum allowable discharge current of the vehicle according to the maximum allowable discharge current of the battery and the consumption current of the vehicle comprises: Obtaining the maximum allowable discharge current of the battery from a discharge power table of the battery; Obtaining a consumption current of the vehicle according to the consumption power of the vehicle and the current voltage of the battery; The difference between the maximum allowable discharge current of the battery and the consumption current of the vehicle is determined as the maximum allowable discharge current of the vehicle.

3. The V2G-based discharge control method according to claim 1, characterized in that: The determining the maximum allowable discharge current of the charging pile according to the maximum allowable discharge current of the vehicle and the maximum discharge current of the charging pile includes: Obtain the maximum limit discharge current of the charging pile specified by the national standard; The minimum value among the maximum allowable discharge current of the vehicle, the maximum discharge current of the charging pile and the maximum limit discharge current is determined as the maximum allowable discharge current of the charging pile.

4. The V2G-based discharge control method according to claim 1, characterized in that: Before discharging the charging pile according to the target discharge current, the method further includes: Obtaining an upper voltage limit and a lower voltage limit of the charging pile; When the current voltage of the battery is greater than the voltage upper limit or less than the voltage lower limit, the discharging prohibition information is output; otherwise, the step of discharging the charging pile according to the target discharging current is executed.

5. The V2G-based discharge control method according to claim 4, characterized in that: After discharging the charging pile according to the target discharge current, the method further includes: Obtaining a discharge control instruction and the current remaining power of the battery; When the current voltage, the discharge control instruction or the current remaining power meets a preset condition, discharging the charging pile is stopped.

6. The V2G-based discharge control method according to claim 4, characterized in that: After discharging the charging pile according to the target discharge current, the method further includes: Obtaining a current discharge current of the charging pile and a current discharge current of the battery; Subtract the consumption current and the current discharge current of the charging pile from the current discharge current of the battery in sequence to obtain a current difference; When the current difference is greater than a preset value for a first preset time, discharging the charging pile is stopped.

7. The V2G-based discharge control method according to claim 4, characterized in that: After discharging the charging pile according to the target discharge current, the method further includes: Obtaining the minimum discharge current of the charging pile and the current discharge current of the battery; When the difference between the current discharge current of the battery and the consumption current is less than or equal to the minimum discharge current for a second preset time, the discharging of the charging pile is stopped.

8. A V2G-based discharge control device, applied to a vehicle, the vehicle comprising a battery and a charging port for connecting to a charging pile, characterized in that: The V2G-based discharge control device includes: A vehicle-end discharge current determination unit, configured to obtain a maximum allowable discharge current of the vehicle according to a maximum allowable discharge current of the battery and a consumption current of the vehicle; A pile end discharge current determination unit, used to determine the maximum allowable discharge current of the charging pile according to the maximum allowable discharge current of the vehicle and the maximum discharge current of the charging pile; a discharge coefficient determination unit, configured to search a preset mapping table for a discharge coefficient corresponding to the temperature of the charging port; a target discharge current determination unit, configured to determine a target discharge current according to a maximum allowable discharge current of the charging pile and the discharge coefficient; A discharge unit is used to discharge the charging pile according to the target discharge current.

9. A V2G-based discharge control device, comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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