A current accuracy detection method, system, device and medium based on BMS communication

Abstract

The present invention provides a method, system, device, and medium for detecting the current accuracy of an on-board battery in the field of electric vehicle technology. The method includes the following steps: Step S10: After a charging pile establishes a connection with the electric vehicle, the charging pile and the electric vehicle perform a handshake interaction; Step S20: The charging pile sets a detection duration, a sampling period, a detection condition, and a fixed charging current; the sampling period is less than the detection duration; Step S30: The charging pile charges the battery of the electric vehicle based on the charging current, detects a first current value of the battery based on the detection duration, sampling period, and detection condition, and communicates with the battery management system (BMS) of the electric vehicle to obtain a second current value detected by the BMS; Step S40: The charging pile calculates the current accuracy based on the first and second current values. The advantage of the present invention is that it greatly improves the accuracy of current accuracy detection.

Description

[0001] This case is a divisional application based on the invention patent with application date of 2021-1-14, application number 202110048791.5, and name “A method, system, equipment and medium for current accuracy detection of vehicle batteries” as the parent case. Technical Field

[0002] The present invention relates to the technical field of electric vehicles, and in particular to a current accuracy detection method, system, device and medium based on BMS communication. Background Art

[0003] Battery electric vehicles (BEVs) are vehicles that are powered by onboard batteries, use motors to drive the wheels, and comply with all requirements of road traffic and safety regulations. Because electric vehicles have less impact on the environment than traditional vehicles, their prospects are widely optimistic.

[0004] With the development of electric vehicles, the demand for batteries used in electric vehicles is also increasing day by day. In order to ensure the safety of electric vehicles, a series of tests need to be carried out after the battery production is completed, and current accuracy test is one of the important tests.

[0005] The traditional method for testing current accuracy involves using a BMS and testing equipment to collect a first current value and a second current value of the battery during charging at a preset sampling period. The current accuracy is then calculated by dividing the absolute difference between the first and second current values ​​by the second current value. However, this traditional method has the following drawbacks: The current is constantly changing throughout the entire charging process. When the battery is nearly fully charged or the battery temperature rises, the current decreases, making the calculated result inaccurate, increasing the error, and failing to represent the actual current accuracy.

[0006] Therefore, how to provide a current precision detection method, system, device and medium for vehicle-mounted batteries to improve the accuracy of current precision detection has become an urgent problem to be solved. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a current precision detection method, system, device and medium for vehicle-mounted batteries, so as to improve the accuracy of current precision detection.

[0008] In a first aspect, the present invention provides a method for detecting the current accuracy of a vehicle battery, comprising the following steps:

[0009] Step S10: After the charging pile and the electric vehicle are connected, the charging pile and the electric vehicle perform a handshake interaction;

[0010] Step S20: The charging pile sets a detection duration, a sampling period, a detection condition, and a fixed charging current; the sampling period is less than the detection duration;

[0011] Step S30: The charging pile charges the battery of the electric vehicle based on the charging current. The charging pile detects a first current value of the battery based on the detection duration, sampling period, and detection conditions, and communicates with the BMS of the electric vehicle to obtain a second current value detected by the BMS.

[0012] Step S40: The charging pile calculates current accuracy based on the first current value and the second current value.

[0013] Furthermore, in step S20, the detection condition is that the SOC of the battery is less than 80%.

[0014] Furthermore, in step S20, the charging current is greater than or equal to 0.5C, where C represents the charging rate.

[0015] Furthermore, in step S40, the current accuracy is calculated as follows:

[0016] P = (Max|nm|) / m×100%;

[0017] Wherein, P represents the current precision; n represents the second current value; and m represents the first current value.

[0018] In a second aspect, the present invention provides a current accuracy detection system for a vehicle-mounted battery, comprising the following modules:

[0019] The connection module is used for the handshake interaction between the charging pile and the electric vehicle after the charging pile and the electric vehicle are connected;

[0020] A parameter setting module is used to set a detection time, a sampling period, a detection condition, and a fixed charging current for the charging pile; the sampling period is shorter than the detection time;

[0021] A current detection module is configured for the charging pile to charge the battery of the electric vehicle based on the charging current, the charging pile detecting a first current value of the battery based on the detection duration, sampling period, and detection conditions, and communicating with the BMS of the electric vehicle to obtain a second current value detected by the BMS;

[0022] A current accuracy calculation module is used for the charging pile to calculate the current accuracy based on the first current value and the second current value.

[0023] Furthermore, in the parameter setting module, the detection condition is that the SOC of the battery is less than 80%.

[0024] Furthermore, in the parameter setting module, the charging current is greater than or equal to 0.5C; where C represents the charging rate.

[0025] Furthermore, in the current accuracy calculation module, the current accuracy calculation formula is:

[0026] P = (Max|nm|) / m×100%;

[0027] Wherein, P represents the current precision; n represents the second current value; and m represents the first current value.

[0028] In a third aspect, the present invention provides a current accuracy detection device for a vehicle-mounted battery, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method described in the first aspect when executing the program.

[0029] In a fourth aspect, the present invention provides a current accuracy detection medium for a vehicle-mounted battery, on which a computer program is stored, and when the program is executed by a processor, the method described in the first aspect is implemented.

[0030] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0031] 1. The battery of the electric vehicle is charged by setting a fixed charging current, and the charging current is greater than or equal to 0.5C. Under the detection condition that the battery SOC is less than 80%, the first current value and the second current value of the battery are detected, that is, the consistency of the current conditions in each sampling cycle is ensured, and the calculation error caused by the sudden change of the current is avoided, thereby greatly improving the accuracy of the current precision detection.

[0032] 2. By ensuring the consistency of current conditions in each sampling period, the calculation error caused by the current change due to inconsistent current detection frequencies of the charging pile and BMS (high frequency of the charging pile and low frequency of the BMS) is avoided, thereby further improving the accuracy of current precision detection.

[0033] 3. By setting the detection time and limiting the detection condition to the battery SOC being less than 80%, the speed of current accuracy detection is greatly improved compared to the traditional whole process of battery charging.

[0034] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are specifically listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0036] Figure 1 This is a flow chart of a method for detecting current accuracy of a vehicle-mounted battery according to the present invention;

[0037] Figure 2 It is a structural schematic diagram of a current accuracy detection system for a vehicle-mounted battery of the present invention;

[0038] Figure 3 It is a structural schematic diagram of a current accuracy detection device for a vehicle-mounted battery of the present invention;

[0039] Figure 4 It is a structural schematic diagram of a current accuracy detection medium for a vehicle-mounted battery of the present invention. DETAILED DESCRIPTION

[0040] The embodiments of the present application provide a method, system, device, and medium for detecting the current accuracy of an on-board battery, thereby improving the accuracy of current accuracy detection.

[0041] The technical solution in the embodiments of the present application has the following overall idea: the battery of the electric vehicle is charged by setting a fixed charging current, and under the detection condition that the battery SOC is less than 80%, the first current value and the second current value of the battery are detected, and the first current value and the second current value are used to calculate the current accuracy, that is, to ensure the consistency of the current conditions under each sampling cycle, avoid calculation errors caused by sudden changes in the current, and thus improve the accuracy of the current accuracy detection.

[0042] Example 1

[0043] This embodiment provides a method for detecting the current accuracy of a vehicle battery. Figure 1 As shown, the following steps are included:

[0044] Step S10: After the charging pile and the electric vehicle are connected, the charging pile and the electric vehicle perform a handshake interaction;

[0045] Step S20: The charging pile sets a detection time, a sampling period, a detection condition, and a fixed charging current; the sampling period is shorter than the detection time; the detection time is preferably 30 seconds; and the sampling period is preferably 1 second.

[0046] Step S30: The charging pile charges the battery of the electric vehicle based on the charging current. The charging pile detects a first current value of the battery based on the detection duration, sampling period, and detection conditions, and communicates with the BMS of the electric vehicle to obtain a second current value detected by the BMS.

[0047] Step S40: The charging pile calculates the current accuracy based on the first current value and the second current value, displays the current accuracy on a display screen, and sends it to the BMS.

[0048] By performing current accuracy detection under the same current conditions, higher detection consistency is achieved, and the resulting current accuracy history curve has better data reference value.

[0049] In step S20, the detection condition is that the SOC of the battery is less than 80% to avoid a decrease in charging current due to an excessively high SOC.

[0050] In step S20, the charging current is greater than or equal to 0.5C, where C represents the charging rate.

[0051] 1C means the current of 1 times the battery capacity. For example, for a 2600mAh battery, 1C = 2600mA, which can be fully charged in 1 hour. Similarly, 0.2C means the current of 0.2 times the battery capacity = 0.2*2600 = 520mA, which can be fully charged in 5 hours.

[0052] In step S40, the current accuracy is calculated as follows:

[0053] P = (Max|nm|) / m×100%;

[0054] Wherein, P represents the current precision; n represents the second current value; and m represents the first current value.

[0055] Example 2

[0056] This embodiment provides a current accuracy detection system for a vehicle-mounted battery. Figure 2 As shown, it includes the following modules:

[0057] The connection module is used for the handshake interaction between the charging pile and the electric vehicle after the charging pile and the electric vehicle are connected;

[0058] A parameter setting module is used to set a detection time, a sampling period, a detection condition, and a fixed charging current for the charging pile; the sampling period is shorter than the detection time; the detection time is preferably 30 seconds; and the sampling period is preferably 1 second;

[0059] A current detection module is configured for the charging pile to charge the battery of the electric vehicle based on the charging current, the charging pile detecting a first current value of the battery based on the detection duration, sampling period, and detection conditions, and communicating with the BMS of the electric vehicle to obtain a second current value detected by the BMS;

[0060] The current accuracy calculation module is used for the charging pile to calculate the current accuracy based on the first current value and the second current value, display the current accuracy on the display screen, and send it to the BMS.

[0061] By performing current accuracy detection under the same current conditions, higher detection consistency is achieved, and the resulting current accuracy history curve has better data reference value.

[0062] In the parameter setting module, the detection condition is that the SOC of the battery is less than 80%, so as to avoid a decrease in charging current due to an excessively high SOC.

[0063] In the parameter setting module, the charging current is greater than or equal to 0.5C; where C represents the charging rate.

[0064] 1C means the current of 1 times the battery capacity. For example, for a 2600mAh battery, 1C = 2600mA, which can be fully charged in 1 hour. Similarly, 0.2C means the current of 0.2 times the battery capacity = 0.2*2600 = 520mA, which can be fully charged in 5 hours.

[0065] In the current accuracy calculation module, the current accuracy calculation formula is:

[0066] P = (Max|nm|) / m×100%;

[0067] Wherein, P represents the current precision; n represents the second current value; and m represents the first current value.

[0068] Based on the same inventive concept, this application provides an electronic device embodiment corresponding to the first embodiment, see the third embodiment for details.

[0069] Example 3

[0070] This embodiment provides a current accuracy detection device for a vehicle-mounted battery, such as Figure 3 As shown, it includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, any implementation method in the first embodiment can be implemented.

[0071] Since the electronic device described in this embodiment is the device used to implement the method in Example 1 of this application, based on the method described in Example 1 of this application, those skilled in the art will be able to understand the specific implementation of the electronic device of this embodiment and its various variations. Therefore, how the electronic device implements the method in the embodiment of this application will not be described in detail here. As long as the device used by those skilled in the art to implement the method in the embodiment of this application falls within the scope of protection to be provided by this application.

[0072] Based on the same inventive concept, this application provides a storage medium corresponding to Example 1, see Example 4 for details.

[0073] Example 4

[0074] This embodiment provides a current accuracy detection medium for a vehicle battery, such as Figure 4 As shown, a computer program is stored thereon, and when the computer program is executed by a processor, any implementation method in Example 1 can be implemented.

[0075] The technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0076] 1. The battery of the electric vehicle is charged by setting a fixed charging current, and the charging current is greater than or equal to 0.5C. Under the detection condition that the battery SOC is less than 80%, the first current value and the second current value of the battery are detected, that is, the consistency of the current conditions in each sampling cycle is ensured, and the calculation error caused by the sudden change of the current is avoided, thereby greatly improving the accuracy of the current precision detection.

[0077] 2. By ensuring the consistency of current conditions in each sampling cycle (high frequency for charging piles and low frequency for BMS), calculation errors caused by current changes due to inconsistent current detection frequencies between charging piles and BMS are avoided, thereby further improving the accuracy of current precision detection.

[0078] 3. By setting the detection time and limiting the detection condition to the battery SOC being less than 80%, the speed of current accuracy detection is greatly improved compared to the traditional whole process of battery charging.

[0079] It will be understood by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0080] The present invention is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products of the embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as the combination of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0081] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0082] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0083] Although the specific embodiments of the present invention are described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and are not intended to limit the scope of the present invention. Equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A current accuracy detection method based on BMS communication, characterized by: The steps include: Step S10: After the charging pile and the electric vehicle are connected, the charging pile and the electric vehicle perform a handshake interaction; Step S20: The charging pile sets a detection time, a sampling period, a detection condition, and a fixed charging current; the sampling period is shorter than the detection time; the detection time is 30 seconds; and the sampling period is 1 second. Step S30: The charging pile charges the battery of the electric vehicle based on the charging current. The charging pile detects a first current value of the battery based on the detection duration, sampling period, and detection conditions, and communicates with the BMS of the electric vehicle to obtain a second current value detected by the BMS. Step S40: The charging pile calculates the current accuracy based on the first current value and the second current value; the calculation formula of the current accuracy is: ； Where P represents the current accuracy; n represents the second current value; m represents the first current value; In step S20, the detection condition is that the SOC of the battery is less than 80%; and the charging current is greater than or equal to 0.5C; where C represents the charging rate.

2. A current accuracy detection system based on BMS communication, characterized by: Includes the following modules: The connection module is used for the handshake interaction between the charging pile and the electric vehicle after the charging pile and the electric vehicle are connected; The parameter setting module is used to set a detection time, a sampling period, a detection condition, and a fixed charging current for the charging pile; the sampling period is less than the detection time; the detection time is 30 seconds; and the sampling period is 1 second; A current detection module is configured for the charging pile to charge the battery of the electric vehicle based on the charging current, the charging pile detecting a first current value of the battery based on the detection duration, sampling period, and detection conditions, and communicating with the BMS of the electric vehicle to obtain a second current value detected by the BMS; A current accuracy calculation module is used to calculate the current accuracy of the charging pile based on the first current value and the second current value; the calculation formula of the current accuracy is: ； Where P represents the current accuracy; n represents the second current value; m represents the first current value; The detection conditions are that the battery's SOC is less than 80%; and the charging current is greater than or equal to 0.5C; where C represents the charging rate.

3. A current accuracy detection device based on BMS communication, 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 program, the method according to claim 1 is implemented.

4. A current accuracy detection medium based on BMS communication, on which a computer program is stored, characterized in that: When the program is executed by a processor, the method according to claim 1 is implemented.

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