A battery remaining power calibration method, device and computer storage medium

Abstract

The present invention discloses a battery remaining power calibration method, device and computer storage medium, the battery remaining power calibration method comprises: executing a charging request step, the charging request step comprises sending a constant current charging request to a V2G charging pile; after charging a preset power, sending a constant current discharge request to the V2G charging pile; after discharging for a preset time, recording the voltage and battery remaining power corresponding to the last moment of constant current discharge, and switching to the charging request step; calculating the voltage difference at the last moment of two adjacent constant current discharges; when the battery remaining power is in the plateau period of a lithium iron phosphate battery and the voltage difference meets a preset condition, calibrating the battery remaining power. The battery remaining power calibration method, device and computer storage medium provided by the present invention can realize the calibration of the remaining power of a lithium iron phosphate battery in the plateau period when the vehicle is fast charged, and the calibration accuracy is high and the scene triggering probability is high.

Description

Technical Field

[0001] The present invention relates to the technical field of power electronics, and in particular to a battery remaining capacity calibration method, device and computer storage medium. Background Art

[0002] With the transformation of the global energy structure and the pursuit of sustainable transportation solutions, V2G (Vehicle to Grid) technology is gradually becoming a key bridge connecting electric vehicles and smart grids. This technology can not only optimize the energy use of electric vehicles and improve energy efficiency, but also provide the necessary regulation capabilities for the power grid through the vehicle's energy storage function, thereby enhancing the stability and reliability of the power grid. However, the promotion and application of V2G technology cannot be separated from efficient, safe and economical energy storage solutions. Compared with other types of lithium-ion batteries, such as lithium cobalt oxide batteries or nickel cobalt manganese batteries, lithium iron phosphate batteries have higher thermal stability and safety, and also have cost advantages. These characteristics make lithium iron phosphate batteries highly favored in V2G vehicle-grid interaction application scenarios with long life and high safety. Among them, the real-time and accurate estimation of the SOC (State of Charge) of the on-board lithium iron phosphate battery can not only eliminate the user's anxiety about the remaining mileage of the vehicle, but also avoid the battery abuse during the vehicle charging and discharging process due to insufficient SOC accuracy, which in turn causes the battery performance to deteriorate. However, due to the characteristics of lithium iron phosphate batteries, the voltage plateau window is only about 40-50mv, and the difficulty in calibrating the SOC during the voltage plateau has become a difficulty in the current industry. Therefore, how to find the SOC calibration point during the voltage plateau of lithium iron phosphate batteries and improve the SOC estimation accuracy is crucial for the application of V2G vehicle-grid interaction technology.

[0003] In the related art, there are three common plateau SOC estimation methods when the vehicle is not charging: the first is the static OCV (Open Circuit Voltage) correction method; the second is the ampere-hour integration method; and the last is the method using the battery model during the discharge process. The method based on static OCV correction mainly uses the OCV curve of the battery test data to calibrate the SOC that meets the conditions after the vehicle has been stationary for a long time. The method has strict preconditions and the probability of application is extremely low. The method based on ampere-hour integration mainly combines the initial SOC with the current integration. The initial SOC deviation is large, and the SOC estimation error cannot be reduced during the charging and discharging process. The method based on the battery model only turns on the calculation during the discharge process, and does not turn on the calculation during the plateau period of the lithium iron phosphate battery, and cannot be applied to the charging process. Summary of the invention

[0004] The object of the present invention is to provide a battery remaining power calibration method, device and computer storage medium, so as to calibrate the remaining power of a lithium iron phosphate battery during the platform period when the vehicle is fast charged, and the calibration accuracy is high and the scene triggering probability is high.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] In a first aspect, an embodiment of the present invention provides a battery remaining power calibration method, the battery remaining power calibration method comprising:

[0007] Executing a charging request step, the charging request step comprising sending a constant current charging request to a V2G charging pile;

[0008] After charging to a preset amount of power, a constant current discharge request is sent to the V2G charging pile;

[0009] After the preset discharge time, the voltage and the remaining battery power corresponding to the last moment of constant current discharge are recorded, and the charging request step is performed;

[0010] Calculate the voltage difference at the last moment of two adjacent constant current discharges;

[0011] When the remaining power of the battery is in the plateau phase of the lithium iron phosphate battery and the voltage difference meets a preset condition, the remaining power of the battery is calibrated.

[0012] As one implementation manner, the step of executing the charging request includes sending a constant current charging request to the V2G charging pile, and further includes:

[0013] Get the charging time and the corresponding charging current;

[0014] The amount of electricity charged into the battery is calculated according to the charging time and the charging current.

[0015] As one implementation manner, after calculating the voltage difference at the last moment of two adjacent constant current discharges, the method further includes:

[0016] When the remaining battery power is not in the plateau phase of the lithium iron phosphate battery or the voltage difference does not meet the preset condition, the process proceeds to the charging request step.

[0017] As one of the implementation modes, the remaining battery power range corresponding to the plateau period of the lithium iron phosphate battery is 30%-95%.

[0018] As one implementation manner, when the remaining power of the battery is in the plateau period of the lithium iron phosphate battery and the voltage difference meets a preset condition, calibrating the remaining power of the battery includes:

[0019] When the remaining battery power is in the plateau period of the lithium iron phosphate battery and the voltage difference meets the preset condition, it is confirmed that the remaining battery power is in a gentle slope area in the plateau period of the lithium iron phosphate battery.

[0020] As one implementation mode, the gentle slope area in the plateau period of the lithium iron phosphate battery corresponds to a battery remaining power range of 58%-62%.

[0021] As one implementation manner, when the remaining power of the battery is in the plateau period of the lithium iron phosphate battery and the voltage difference meets a preset condition, calibrating the remaining power of the battery includes:

[0022] According to the battery remaining power interval corresponding to the gentle slope area in the plateau period of the lithium iron phosphate battery, the battery remaining power is corrected to 60%.

[0023] As one implementation manner, when the remaining power of the battery is in the plateau period of the lithium iron phosphate battery and the voltage difference meets the preset condition, after calibrating the remaining power of the battery, the method further includes:

[0024] The constant current charging request is sent to the V2G charging pile to continue charging according to the battery performance.

[0025] In a second aspect, an embodiment of the present invention provides a battery remaining power calibration device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps of the battery remaining power calibration method described in the first aspect are implemented.

[0026] In a third aspect, an embodiment of the present invention provides a computer storage medium, in which a computer program is stored. When the computer program is executed by a processor, the steps of the battery remaining power calibration method as described in the first aspect are implemented.

[0027] An embodiment of the present invention provides a battery remaining power calibration method, device and computer storage medium, the battery remaining power calibration method comprising: executing a charging request step, the charging request step comprising sending a constant current charging request to a V2G charging pile; after charging a preset power, sending a constant current discharge request to the V2G charging pile; after discharging for a preset time, recording the voltage and battery remaining power corresponding to the last moment of constant current discharge, and going to the charging request step; calculating the voltage difference at the last moment of two adjacent constant current discharges; when the battery remaining power is in the plateau period of the lithium iron phosphate battery and the voltage difference meets the preset conditions, calibrating the battery remaining power. In this way, the charging request step is first executed, and the charging request step includes sending a constant current charging request to the V2G charging pile. After charging the preset power, a constant current discharge request is sent to the V2G charging pile. After the preset discharge time, the voltage corresponding to the last moment of the constant current discharge and the remaining battery power are recorded, and the charging request step is transferred to the charging request step. Then, the voltage difference at the last moment of two adjacent constant current discharges is calculated. When the remaining battery power is in the plateau period of the lithium iron phosphate battery and the voltage difference meets the preset conditions, the remaining battery power is calibrated. This can realize the calibration of the remaining power of the lithium iron phosphate battery in the plateau period when the vehicle is fast charged, and the calibration accuracy is high, and the scene triggering probability is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of a flow chart of a battery remaining power calibration method provided by an embodiment of the present invention.

[0029] Figure 2 This is a current-time curve diagram of the V2G charging pile during the charging process provided by an embodiment of the present invention.

[0030] Figure 3 A voltage-time curve diagram of the V2G charging pile during the charging process provided by an embodiment of the present invention.

[0031] Figure 4 A schematic diagram of the structure of a battery remaining power calibration device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0032] It should be noted that, in this article, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element. In addition, components, features, and elements with the same name in different embodiments of the present invention may have the same meaning or different meanings, and their specific meanings need to be determined by their explanation in the specific embodiment or further combined with the context of the specific embodiment.

[0033] It should be understood that, although the terms first, second, third, etc. may be used to describe various information in this article, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this article, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein can be interpreted as "at the time of" or "when" or "in response to determination". Furthermore, as used in this article, the singular forms "one", "one" and "the" are intended to also include plural forms, unless there is an opposite indication in the context. It should be further understood that the terms "comprising" and "including" indicate the presence of the described features, steps, operations, elements, components, projects, kinds, and / or groups, but do not exclude the presence, occurrence or addition of one or more other features, steps, operations, elements, components, projects, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Thus, “A, B, or C” or “A, B and / or C” means “any of the following: A; B; C; A and B; A and C; B and C; A, B, and C.” An exception to this definition will occur only when a combination of elements, functions, steps, or operations are inherently mutually exclusive in some manner.

[0034] It should be understood that, although the various steps in the flowchart in the embodiment of the present invention are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless there is a clear description in this article, the execution of these steps is not strictly limited in order, and they can be executed in other orders. Moreover, at least a portion of the steps in the figure may include a plurality of sub-steps or a plurality of stages, and these sub-steps or stages are not necessarily executed at the same time, but can be executed at different times, and their execution order is not necessarily carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.

[0035] It should be noted that, in this article, step codes such as S101, S102, etc. are used for the purpose of expressing the corresponding content more clearly and concisely, and do not constitute a substantial limitation on the sequence. When implementing the step codes, those skilled in the art may execute S102 first and then S101, etc., but these should all be within the scope of protection of the present invention.

[0036] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0037] See also Figure 1 , is a battery remaining power calibration method provided by an embodiment of the present invention. The battery remaining power calibration method can be performed by a battery remaining power calibration device provided by an embodiment of the present invention. The battery remaining power calibration device can be implemented in software and / or hardware. The battery remaining power calibration method includes the following steps:

[0038] Step S101: executing a charging request step, wherein the charging request step includes sending a constant current charging request to a V2G charging pile;

[0039] Specifically, this embodiment can be applied to BMS (Battery Management System). BMS may include a control module, a display module, a wireless communication module, an electrical device, a battery pack for powering the electrical device, and a collection module for collecting battery information of the battery pack, which is used to manage and maintain each battery unit, monitor the status of the battery, and prevent the battery from being overcharged and over-discharged to extend the service life of the battery. A V2G charging pile is an electric vehicle charging pile with a bidirectional energy flow function. It can not only supply power to and charge electric vehicles, but also obtain electrical energy from electric vehicles to achieve bidirectional energy transmission.

[0040] In one embodiment, the step of executing the charging request includes sending a constant current charging request to the V2G charging pile, and further includes:

[0041] Get the charging time and the corresponding charging current;

[0042] The amount of electricity charged into the battery is calculated according to the charging time and the charging current.

[0043] Here, the BMS acquisition module collects battery charging curve information in real time, including battery voltage and current. The charged power is calculated based on the charging time and the corresponding charging current to determine whether the preset power has been reached.

[0044] Step S102: after charging the preset amount of electricity, sending a constant current discharge request to the V2G charging pile;

[0045] Here, the preset power level can be set in advance according to actual application requirements and battery characteristics, such as 3%-5% SOC.

[0046] Step S103: after the preset discharge time, record the voltage and the remaining battery power corresponding to the last moment of constant current discharge, and go to the charging request step;

[0047] Here, the preset time can be set in advance according to actual application requirements and battery characteristics, such as 30s, etc. After the preset discharge time, the voltage corresponding to the last moment of the first constant current discharge and the remaining battery power are recorded, and a constant current charging request is sent to the V2G charging pile again to perform constant current charging on the battery again. After the preset power is charged, a constant current discharge request is sent to the V2G charging pile again to perform constant current discharge on the battery again. After the preset discharge time, the voltage corresponding to the last moment of the second constant current discharge and the remaining battery power are recorded, and then the process goes to step S104.

[0048] Step S104: Calculate the voltage difference between two adjacent constant current discharges at the last moment;

[0049] In one embodiment, after calculating the voltage difference at the last moment of two adjacent constant current discharges, the method further includes:

[0050] When the remaining battery power is not in the plateau phase of the lithium iron phosphate battery or the voltage difference does not meet the preset condition, the process proceeds to the charging request step.

[0051] In one embodiment, the plateau period of the lithium iron phosphate battery corresponds to a battery remaining power interval of 30%-95%.

[0052] Here, the real-time remaining battery power is obtained. When the remaining battery power is not in the plateau period of the lithium iron phosphate battery, that is, SOC≠30%-95%, or the calculated voltage difference at the last moment of two adjacent constant current discharges does not meet the preset conditions, it means that the current SOC is not the correction point of the lithium iron phosphate battery plateau period that is being sought, then the charge and discharge request is continued, and the new voltage difference at the last moment of two adjacent constant current discharges is calculated until the correction point of the plateau period is found.

[0053] Step S105: when the remaining power of the battery is in the plateau phase of the lithium iron phosphate battery and the voltage difference meets a preset condition, calibrating the remaining power of the battery.

[0054] Here, the preset conditions can be set in advance according to actual application requirements and battery characteristics, such as a voltage difference greater than 10mV, a voltage difference greater than 15mV, etc.

[0055] In summary, in the battery remaining power calibration method provided in the above embodiment, the charging request step is first executed, and the charging request step includes sending a constant current charging request to the V2G charging pile. After charging a preset power, a constant current discharge request is sent to the V2G charging pile. After the preset discharge time, the voltage corresponding to the last moment of the constant current discharge and the remaining power of the battery are recorded, and the charging request step is executed. Then, the voltage difference at the last moment of two adjacent constant current discharges is calculated. When the remaining power of the battery is in the plateau period of the lithium iron phosphate battery and the voltage difference meets the preset conditions, the remaining power of the battery is calibrated. This can realize the calibration of the remaining power of the lithium iron phosphate battery in the plateau period when the vehicle is fast charged, and the calibration accuracy is high and the probability of scene triggering is high.

[0056] In one embodiment, when the remaining power of the battery is in the plateau phase of the lithium iron phosphate battery and the voltage difference meets a preset condition, calibrating the remaining power of the battery includes:

[0057] When the remaining battery power is in the plateau period of the lithium iron phosphate battery and the voltage difference meets the preset condition, it is confirmed that the remaining battery power is in a gentle slope area in the plateau period of the lithium iron phosphate battery.

[0058] In one embodiment, the gentle slope area in the plateau period of the lithium iron phosphate battery corresponds to a battery remaining power interval of 58%-62%.

[0059] Here, when the remaining battery power is 30%-95% and the voltage difference at the last moment of two adjacent constant current discharges meets the preset conditions (for example, greater than 10Mv / 15mV), it is confirmed that the current SOC is in the gentle slope area in the plateau period of the lithium iron phosphate battery, where the SOC range corresponding to the gentle slope area is 58%-62%, that is, the current SOC is the correction point of the lithium iron phosphate battery plateau period being sought.

[0060] In one embodiment, when the remaining power of the battery is in the plateau phase of the lithium iron phosphate battery and the voltage difference meets a preset condition, calibrating the remaining power of the battery includes:

[0061] According to the battery remaining power interval corresponding to the gentle slope area in the plateau period of the lithium iron phosphate battery, the battery remaining power is corrected to 60%.

[0062] Here, the SOC range corresponding to the gentle slope area in the plateau period of the lithium iron phosphate battery is 58%-62%, so the middle value is taken to correct the remaining battery power to 60%.

[0063] In one embodiment, when the remaining power of the battery is in the plateau period of the lithium iron phosphate battery and the voltage difference meets the preset condition, after calibrating the remaining power of the battery, the method further includes:

[0064] The constant current charging request is sent to the V2G charging pile to continue charging according to the battery performance.

[0065] Here, after the SOC in the gentle slope area is calibrated, the discharge current is no longer requested, and the battery continues to be charged according to its capacity.

[0066] Based on the same inventive concept as the above-mentioned embodiment, this embodiment describes the technical solution of the above-mentioned embodiment in detail through specific examples, taking the above-mentioned battery remaining power calibration method applied to BMS as an example. The BMS acquisition unit collects battery charging curve information in real time, including battery voltage and current; Figure 2 As shown, BMS requests the V2G charging pile to charge with constant current Ap. When a certain amount of electricity △z is charged, it requests the V2G charging pile to discharge with constant current An for a certain time, and records the voltage corresponding to point a at the last moment of constant current discharge. It continues to request the V2G charging pile to charge with constant current Ap. When a certain amount of electricity △z is charged, it requests the V2G charging pile to discharge with constant current An for a certain time, and records the voltage corresponding to point b at the last moment of constant current discharge. By calculating the voltage difference between the last moments of two adjacent constant current discharges, that is, the voltage difference between point b and point a, it is determined whether the current SOC is in the gentle slope area of ​​the lithium iron phosphate battery platform period, where the SOC interval corresponding to the platform period is 30%-95%, and the SOC interval corresponding to the gentle slope area is 58%-62%; as shown in FIG. Figure 3 (a) shows the complete voltage-time curve of the V2G charging pile during charging. Figure 3(b) in the figure shows a partial enlarged view of (a), and the gentle slope area [ab] of the platform period is clearly visible. When the voltage difference between point b and point a meets the preset conditions (for example, greater than 10Mv / 15mV), the SOC is identified as being in the gentle slope area, the actual SOC is corrected to 60%, and the discharge current is no longer requested, and the vehicle continues to be charged according to the battery capacity; otherwise, the above steps of charging and discharging and calculating the voltage difference are repeated until the gentle slope area is identified. In this way, the remaining power of the lithium iron phosphate battery in the platform period can be calibrated when the vehicle is fast charged, and the calibration accuracy is high, and the probability of scene triggering is high.

[0067] Based on the same inventive concept as the above embodiments, an embodiment of the present invention provides a battery remaining power calibration device, such as Figure 4 As shown, the battery remaining power calibration device includes: a processor 110 and a memory 111 for storing a computer program that can be run on the processor 110; wherein, Figure 4 The processor 110 shown in the figure is not used to indicate that the number of the processor 110 is one, but is only used to indicate the positional relationship of the processor 110 relative to other devices. In actual applications, the number of the processor 110 may be one or more; similarly, Figure 4 The memory 111 shown in the figure has the same meaning, that is, it is only used to refer to the position relationship of the memory 111 relative to other devices. In practical applications, the number of memories 111 can be one or more. The processor 110 is used to implement the battery remaining power calibration method when running the computer program.

[0068] The battery remaining power calibration device may also include: at least one network interface 112. The various components in the battery remaining power calibration device are coupled together via a bus system 113. It is understood that the bus system 113 is used to achieve connection and communication between these components. In addition to the data bus, the bus system 113 also includes a power bus, a control bus, and a status signal bus. However, for the sake of clarity, in Figure 4 Various buses are labeled as bus system 113 .

[0069] The memory 111 may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. The non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a magnetic random access memory (FRAM), a flash memory, a magnetic surface memory, an optical disc, or a compact disc read-only memory (CD-ROM); the magnetic surface memory may be a disk memory or a tape memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as static random access memory (SRAM), synchronous static random access memory (SSRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM, SyncLink Dynamic Random Access Memory), and direct RAMbus random access memory (DRRAM, Direct Rambus Random Access Memory).The memory 111 described in the embodiments of the present invention is intended to include but is not limited to these and any other suitable types of memories.

[0070] The memory 111 in the embodiment of the present invention is used to store various types of data to support the operation of the battery remaining power calibration device. Examples of these data include: any computer program used to operate on the battery remaining power calibration device, such as an operating system and an application; contact data; phone book data; messages; pictures; videos, etc. Among them, the operating system includes various system programs, such as a framework layer, a core library layer, a driver layer, etc., which are used to implement various basic services and process hardware-based tasks. The application program may include various applications, such as a media player (Media Player), a browser (Browser), etc., which are used to implement various application services. Here, the program that implements the method of the embodiment of the present invention may be included in the application program.

[0071] Based on the same inventive concept as the above-mentioned embodiment, this embodiment further provides a computer storage medium, in which a computer program is stored. The computer storage medium may be a ferromagnetic random access memory (FRAM), a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a flash memory, a magnetic surface memory, an optical disc, or a compact disc read-only memory (CD-ROM); or it may be various devices including one or any combination of the above-mentioned memories, such as a mobile phone, a computer, a tablet device, a personal digital assistant, etc. When the computer program stored in the computer storage medium is executed by the processor, the above-mentioned battery remaining power calibration method is implemented. For the specific steps implemented when the computer program is executed by the processor, please refer to Figure 1 The description of the illustrated embodiment will not be repeated here.

[0072] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0073] In this document, the terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of elements other than those listed and may also include additional elements not expressly listed.

[0074] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A battery remaining capacity calibration method, characterized in that: The battery remaining capacity calibration method comprises: Executing a charging request step, the charging request step comprising sending a constant current charging request to a V2G charging pile; After charging to a preset amount of power, a constant current discharge request is sent to the V2G charging pile; After the preset discharge time, the voltage and the remaining battery power corresponding to the last moment of the constant current discharge are recorded, and the charging request step is turned to the charging request step, and the constant current charging request is sent to the V2G charging pile again. After the preset power is charged, the constant current discharge request is sent to the V2G charging pile again. After the preset discharge time, the voltage and the remaining battery power corresponding to the last moment of the second constant current discharge are recorded until the voltage and the remaining battery power at the last moment of two adjacent constant current discharges are obtained; Calculate the voltage difference at the last moment of two adjacent constant current discharges; When the remaining battery power is in the plateau period of the lithium iron phosphate battery and the voltage difference meets the preset condition, it is confirmed that the remaining battery power is in the gentle slope area in the plateau period of the lithium iron phosphate battery, and the remaining battery power is calibrated.

2. The battery remaining capacity calibration method according to claim 1, characterized in that: The step of executing the charging request includes sending a constant current charging request to the V2G charging pile, and further includes: Get the charging time and the corresponding charging current; The amount of electricity charged into the battery is calculated according to the charging time and the charging current.

3. The battery remaining capacity calibration method according to claim 1, characterized in that: After calculating the voltage difference at the last moment of two adjacent constant current discharges, the method further includes: When the remaining battery power is not in the plateau phase of the lithium iron phosphate battery or the voltage difference does not meet the preset condition, the process proceeds to the charging request step.

4. The battery remaining capacity calibration method according to claim 3, characterized in that: The plateau period of the lithium iron phosphate battery corresponds to a remaining battery power range of 30%-95%.

5. The battery remaining capacity calibration method according to claim 1, characterized in that: When the remaining power of the battery is in the plateau period of the lithium iron phosphate battery and the voltage difference meets a preset condition, calibrating the remaining power of the battery includes: When the remaining battery power is in the plateau period of the lithium iron phosphate battery and the voltage difference meets the preset condition, it is confirmed that the remaining battery power is in a gentle slope area in the plateau period of the lithium iron phosphate battery.

6. The battery remaining capacity calibration method according to claim 5, characterized in that: The gentle slope area in the plateau period of the lithium iron phosphate battery corresponds to a battery remaining power range of 58%-62%.

7. The battery remaining capacity calibration method according to claim 6, characterized in that: When the remaining power of the battery is in the plateau period of the lithium iron phosphate battery and the voltage difference meets a preset condition, calibrating the remaining power of the battery includes: According to the battery remaining power interval corresponding to the gentle slope area in the plateau period of the lithium iron phosphate battery, the battery remaining power is corrected to 60%.

8. The battery remaining capacity calibration method according to claim 1, characterized in that: When the remaining power of the battery is in the plateau period of the lithium iron phosphate battery and the voltage difference meets the preset condition, after calibrating the remaining power of the battery, the method further includes: The constant current charging request is sent to the V2G charging pile to continue charging according to the battery performance.

9. A battery remaining capacity calibration device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the battery remaining power calibration method according to any one of claims 1 to 8 are implemented.

10. A computer storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the battery remaining power calibration method as claimed in any one of claims 1 to 8 are implemented.

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