Battery voltage acquisition fault warning method and system

Abstract

The present invention discloses a battery voltage acquisition fault warning method and system, the method comprising the following steps: obtaining the total voltage of a battery system and the effective voltage of each battery cell in each frame time within a preset monitoring time; obtaining the number of abnormal frames of voltage data according to the preset monitoring time, the total voltage of the battery system and the effective voltage of each battery cell in each frame time; when it is detected that the ratio of the number of abnormal frames of voltage data to the total number of frames in the preset monitoring time is greater than or equal to a preset proportion threshold, obtaining the abnormal battery cell and issuing a sampling fault warning signal; therefore, the abnormal battery cell can be obtained in time, the sampling fault warning signal can be issued, and the battery is in a safe operating state.

Description

Technical Field

[0001] The present invention relates to the field of battery safety, and in particular to a battery voltage acquisition failure early warning method and system. Background Art

[0002] Battery safety has become a growing concern in society in recent years, and the battery management system (BMS), as a battery nanny or battery steward, is mainly used to intelligently manage and maintain each battery unit, prevent overcharging and over-discharging of the battery, extend the battery life, and monitor the battery status. If the battery voltage information collected by the battery management system (BMS) is wrong, it will seriously affect the normal function of the battery management system, and the battery will be under potential safety hazards.

[0003] The existing battery management system BMS determines that the battery voltage sampling is faulty. Generally, it only determines that the battery voltage sampling is lost or exceeds the range. It cannot determine the authenticity of the value within the range, and it is impossible to know whether there is abnormal voltage sampling data. Summary of the invention

[0004] The present invention provides a battery voltage acquisition fault warning method and system, which can timely acquire abnormal battery cells and send out sampling fault warning signals to keep the battery in a safe operating state.

[0005] In a first aspect, a battery voltage acquisition failure early warning method is provided, comprising the following steps:

[0006] Obtain the total voltage of the battery system and the effective voltage of each battery cell at each frame time within the preset monitoring time;

[0007] According to the preset monitoring time, the total voltage of the battery system within each frame time and the effective voltage of each battery cell, the number of abnormal frames of voltage data is obtained;

[0008] When it is detected that the ratio of the number of abnormal frames of the voltage data to the total number of frames of the preset monitoring time is greater than or equal to a preset proportion threshold, the abnormal battery cell is obtained and a sampling fault warning signal is issued.

[0009] According to the first aspect, in a first possible implementation of the first aspect, the step of “obtaining the number of abnormal frames of voltage data according to the preset monitoring time, the total voltage of the battery system within each frame time, and the effective voltage of each of the battery cells” specifically includes the following steps:

[0010] In a single frame time;

[0011] According to each of the battery cell effective voltages, a voltage reference value of the effective voltages of all the battery cells is obtained;

[0012] According to the effective voltage of each battery cell and the voltage reference value, obtaining the number of battery cells whose difference between the effective voltage of the battery cell and the voltage reference value is greater than a preset difference;

[0013] When it is detected that the difference between the total voltage of the battery system and the sum of the effective voltages of all the battery cells and the ratio of the difference to the number of battery cells is greater than or equal to a preset difference, it is determined that the voltage data within a single frame time is abnormal;

[0014] According to the voltage data abnormality within the preset monitoring time and single frame time, the number of voltage data abnormal frames is obtained.

[0015] According to the first possible implementation manner of the first aspect, in the second possible implementation manner of the first aspect, the step of “obtaining a voltage reference value of the effective voltages of all the battery cells according to each of the battery cell effective voltages; and obtaining, according to each battery cell effective voltage and the voltage reference value, the number of battery cells whose difference between the battery cell effective voltage and the voltage reference value is greater than a preset difference” specifically includes the following steps:

[0016] According to each of the battery cell effective voltages, the voltage median of all battery cell effective voltages is obtained; and the number of battery cells whose median difference between the battery cell effective voltage and the voltage median is greater than a preset difference is obtained; or,

[0017] According to each of the battery cell effective voltages, an average voltage of all the battery cell effective voltages is obtained; and the number of battery cells whose average difference between the battery cell effective voltage and the voltage average is greater than a preset difference is obtained.

[0018] According to the second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, the step of “when it is detected that the difference between the total voltage of the battery system and the sum of the effective voltages of all the battery cells and the ratio of the number of battery cells is greater than or equal to a preset difference, then determining that the voltage data within a single frame time is abnormal” specifically includes the following steps:

[0019] According to the total voltage of the battery system volt total , the total effective voltage of all cells Volt1 total , get the difference volt between the total voltage of the battery system and the sum of the effective voltages of all cells off :

[0020]

[0021] When the difference volt is detected off The ratio of the number of cells N is greater than or equal to the preset difference volt thr hour,

[0022] It is judged that the voltage data within a single frame time is abnormal;

[0023] In formula (1), Cell i is the voltage of the ith battery cell, and n is the total number of battery cells.

[0024] According to the third possible implementation manner of the first aspect, in the fourth possible implementation manner of the first aspect, the step of “obtaining an abnormal battery cell when it is detected that the ratio of the number of abnormal frames of the voltage data to the total number of frames of the preset monitoring time is greater than or equal to a preset proportion threshold value” specifically includes the following steps:

[0025] When it is detected that the ratio of the number of abnormal frames of the voltage data to the total number of frames in the preset monitoring time is greater than or equal to the preset proportion threshold, the battery cell whose maximum median difference or maximum average difference of the single frame time occurs the most times in the preset monitoring time is determined to be the abnormal battery cell.

[0026] According to the fourth possible implementation manner of the first aspect, in a fifth possible implementation manner of the first aspect, the step of “obtaining the effective voltage of each battery cell within a preset monitoring time” specifically includes the following steps:

[0027] Obtain the initial voltage of each battery cell within the preset monitoring time;

[0028] When it is detected that the initial voltage of the battery cell is within a preset voltage range, the initial voltage of the battery cell is determined to be an effective voltage of the battery cell;

[0029] When it is detected that the initial voltage of the battery cell is not within the preset voltage range, a sampling failure warning signal is issued.

[0030] According to the fifth possible implementation manner of the first aspect, in a sixth possible implementation manner of the first aspect, the preset difference is set to 0.2V, and the preset proportion threshold is set to 10%.

[0031] In a second aspect, a battery voltage acquisition fault warning system is provided, comprising:

[0032] The voltage acquisition module is used to obtain the total voltage of the battery system and the effective voltage of each battery cell in each frame time within the preset monitoring time;

[0033] an abnormal frame number acquisition module, which is in communication with the voltage acquisition module and is used to acquire the abnormal frame number of voltage data according to a preset monitoring time, the total voltage of the battery system within each frame time, and the effective voltage of each battery cell; and

[0034] The abnormal cell module is communicatively connected with the voltage acquisition module and the abnormal frame number acquisition module, and is used to acquire the abnormal cell and issue a sampling fault warning signal when it is detected that the ratio of the abnormal frame number of the voltage data to the total frame number of the preset monitoring time is greater than or equal to a preset proportion threshold.

[0035] According to the second aspect, in a first possible implementation of the second aspect, the abnormal frame number acquisition module is used to obtain, within a single frame time, a voltage reference value of the effective voltages of all battery cells according to the effective voltage of each battery cell; obtain, according to each battery cell effective voltage and the voltage reference value, the number of battery cells whose difference between the effective voltage of the battery cell and the voltage reference value is greater than a preset difference; when it is detected that the difference between the total voltage of the battery system and the sum of the effective voltages of all battery cells and the ratio of the difference to the number of battery cells is greater than or equal to the preset difference, it is determined that the voltage data within the single frame time is abnormal; based on the preset monitoring time and the voltage data abnormality within the single frame time, the number of abnormal voltage data frames is obtained.

[0036] According to the first possible implementation method of the first aspect, in the second possible implementation method of the first aspect, the abnormal battery cell module is used to determine that the battery cell whose maximum median difference or maximum mean difference of single frame time occurs the most times within the preset monitoring time is an abnormal battery cell when it is detected that the ratio of the number of abnormal frames of the voltage data to the total number of frames within the preset monitoring time is greater than or equal to a preset proportion threshold.

[0037] Compared with the prior art, the advantages of the present invention are as follows: the present invention first obtains the total voltage of the battery system and the effective voltage of each battery cell in each frame time within the preset monitoring time; then obtains the number of abnormal frames of voltage data according to the preset monitoring time, the total voltage of the battery system and the effective voltage of each battery cell in each frame time; finally, when it is detected that the ratio of the number of abnormal frames of voltage data to the total number of frames in the preset monitoring time is greater than or equal to the preset proportion threshold, the abnormal battery cell is obtained and a sampling fault warning signal is issued; therefore, the abnormal battery cell can be obtained in time, a sampling fault warning signal can be issued, and the battery is in a safe operating state. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a flow chart of an embodiment of a battery voltage acquisition fault warning method of the present invention;

[0039] Figure 2 It is a flow chart of another embodiment of a battery voltage acquisition fault warning method of the present invention;

[0040] Figure 3 It is a flow chart of another embodiment of a battery voltage acquisition fault warning method of the present invention;

[0041] Figure 4It is a structural schematic diagram of a battery voltage acquisition fault early warning system of the present invention. Description of the drawings:

[0043] 100. Battery voltage acquisition fault warning system; 110. Voltage acquisition module; 120. Abnormal frame number acquisition module; 130. Abnormal battery cell module. DETAILED DESCRIPTION

[0044] Reference will now be made in detail to specific embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Although the present invention will be described in conjunction with specific embodiments, it will be understood that it is not intended to limit the present invention to the embodiments described. On the contrary, it is intended to cover changes, modifications and equivalents included in the spirit and scope of the present invention as defined by the appended claims. It should be noted that the method steps described herein can all be implemented by any functional block or functional arrangement, and any functional block or functional arrangement can be implemented as a physical entity or a logical entity, or a combination of the two.

[0045] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0046] Note: The example to be introduced below is only a specific example, and is not intended to limit the embodiments of the present invention to the following specific steps, values, conditions, data, sequences, etc. Those skilled in the art can apply the concept of the present invention to construct more embodiments not mentioned in this specification by reading this specification.

[0047] See also Figure 1 As shown, an embodiment of the present invention provides a battery voltage acquisition failure warning method, comprising the following steps:

[0048] S100, obtaining the total voltage of the battery system and the effective voltage of each battery cell in each frame time within the preset monitoring time; the BMS collects the voltage of each battery cell, and at the same time, the BMS directly collects the total voltage of the battery system between the total positive and total negative of the battery system;

[0049] S200, according to the preset monitoring time, the total voltage of the battery system within each frame time and the effective voltage of each battery cell, the number of abnormal frames of voltage data is obtained; if the duration of the vehicle monitoring data on that day is greater than a certain threshold, that is, the duration of the monitoring data is the preset monitoring time (the purpose is to eliminate the accuracy fluctuation caused by too little monitoring data), such as 10 minutes (if the monitoring data frequency is 10 seconds / frame, then a total of 60 frames);

[0050] S300, when it is detected that the ratio of the number of abnormal frames of the voltage data to the total number of frames of the preset monitoring time is greater than or equal to a preset proportion threshold, the abnormal battery cell is obtained and a sampling fault warning signal is issued.

[0051] Specifically, in this embodiment, the existing battery management system BMS determines that the voltage sampling of the battery fails. Generally, it only determines that the voltage sampling of the battery is lost or exceeds the range. The authenticity of the value within the range cannot be determined, and it is impossible to know whether there is abnormal voltage sampling data. Therefore, the present invention first obtains the total voltage of the battery system and the effective voltage of each battery cell in each frame time within the preset monitoring time; then, according to the preset monitoring time, the total voltage of the battery system in each frame time and the effective voltage of each battery cell, the number of abnormal voltage data frames is obtained; finally, when it is detected that the ratio of the number of abnormal voltage data frames to the total number of frames in the preset monitoring time is greater than or equal to the preset proportion threshold, the abnormal battery cell is obtained and a sampling fault warning signal is issued; therefore, the abnormal battery cell can be obtained in time, a sampling fault warning signal is issued, and the battery is in a safe operating state.

[0052] See also Figure 2 As shown, preferably, in another embodiment of the present application, the step of "S200, obtaining the number of abnormal frames of voltage data according to the preset monitoring time, the total voltage of the battery system within each frame time and the effective voltage of each battery cell" specifically includes the following steps:

[0053] S210, obtaining a voltage reference value of the effective voltages of all the battery cells according to the effective voltage of each battery cell within a single frame time;

[0054] S220, according to the effective voltage of each battery cell and the voltage reference value, obtaining the number of battery cells whose difference between the effective voltage of the battery cell and the voltage reference value is greater than a preset difference;

[0055] S230, when it is detected that the difference between the total voltage of the battery system and the sum of the effective voltages of all the battery cells and the ratio of the total voltage to the number of battery cells is greater than or equal to a preset difference, it is determined that the voltage data within a single frame time is abnormal;

[0056] S240, obtaining the number of voltage data abnormality frames according to the voltage data abnormality within the preset monitoring time and the single frame time.

[0057] Specifically, in this embodiment, as long as the voltage data within a single frame time is abnormal, then within the preset monitoring time of 10 minutes, there are a total of 60 frames, and the number of abnormal voltage data frames within the preset monitoring time of 60 frames can be obtained.

[0058] Preferably, in another embodiment of the present application, the step of "S210, obtaining a voltage reference value of the effective voltages of all the battery cells according to each of the effective voltages of the battery cells; S220, obtaining the number of battery cells whose difference between the effective voltage of the battery cell and the voltage reference value is greater than a preset difference according to each of the effective voltages of the battery cells and the voltage reference value" specifically includes the following steps:

[0059] According to each of the battery cell effective voltages, the voltage median of all battery cell effective voltages is obtained; and the number of battery cells whose median difference between the battery cell effective voltage and the voltage median is greater than a preset difference is obtained; or,

[0060] According to each of the battery cell effective voltages, an average voltage of all the battery cell effective voltages is obtained; and the number of battery cells whose average difference between the battery cell effective voltage and the voltage average is greater than a preset difference is obtained.

[0061] Specifically, in this embodiment, the definition of the voltage reference value can be divided into two cases: the voltage median and the voltage average; the preset difference is set to 0.2V, and the preset difference can be adjusted according to the performance of the big data production environment until it is stable, and the false alarm rate and missed alarm rate of the early warning are controlled at a certain level. Median difference: a group of data, the difference between each data and the median of this group of data. Average difference: a group of data, the difference between each data and the average of this group of data.

[0062] Preferably, in another embodiment of the present application, the step of "S230, when it is detected that the difference between the total voltage of the battery system and the sum of the effective voltages of all the battery cells and the ratio of the number of battery cells is greater than or equal to a preset difference, then determining that the voltage data within a single frame time is abnormal" specifically includes the following steps:

[0063] According to the total voltage Volt of the battery system total , the total effective voltage of all cells Volt1 total , get the difference volt between the total voltage of the battery system and the sum of the effective voltages of all cells off :

[0064]

[0065] When the difference volt is detected off The ratio of the number of cells N is greater than or equal to the preset difference volt thr hour,

[0066] It is judged that the voltage data within a single frame time is abnormal;

[0067] In formula (1), Cell i is the voltage of the ith battery cell, and n is the total number of battery cells.

[0068] Preferably, in another embodiment of the present application, the step of "S300, when it is detected that the ratio of the number of abnormal frames of the voltage data to the total number of frames of the preset monitoring time is greater than or equal to a preset proportion threshold, obtaining an abnormal battery cell" specifically includes the following steps:

[0069] When it is detected that the ratio of the number of abnormal frames of the voltage data to the total number of frames in the preset monitoring time is greater than or equal to the preset proportion threshold, the battery cell whose maximum median difference or maximum average difference of the single frame time occurs the most times in the preset monitoring time is determined to be the abnormal battery cell.

[0070] Specifically, in this embodiment, the preset ratio threshold is set to 10%, and the threshold is adjusted according to the performance of the big data production environment until it is stable, so as to control the false alarm rate and missed alarm rate of the early warning to a certain level.

[0071] See also Figure 3 As shown, preferably, in another embodiment of the present application, the step of "S100, obtaining the effective voltage of each battery cell within a preset monitoring time" specifically includes the following steps:

[0072] S110, obtaining the initial voltage of each battery cell within a preset monitoring time;

[0073] S120, when it is detected that the initial voltage of the battery cell is within a preset voltage range, determining that the initial voltage of the battery cell is an effective voltage of the battery cell;

[0074] S130, when it is detected that the initial voltage of the battery cell is not within a preset voltage range, a sampling fault warning signal is issued.

[0075] Specifically, in this embodiment, since the reasonable effective value range of a single battery cell voltage is generally (0v, 5v), the voltage within 0-5v is generally the effective battery cell voltage. If the voltage of a single battery cell is 0v or ≥5V, it is directly determined that the voltage acquisition is faulty.

[0076] The present invention provides a battery voltage acquisition fault early warning method,

[0077] 1. Obtain the total voltage of the battery system and the effective voltage of each battery cell in each frame time within the preset monitoring time; when it is detected that the initial voltage of the battery cell is within the preset voltage range, the initial voltage of the battery cell is determined to be the effective voltage of the battery cell;

[0078] 2. Within a single frame time, according to each of the effective voltages of the battery cells, obtain a voltage reference value of the effective voltages of all the battery cells; according to each of the effective voltages of the battery cells and the voltage reference value, obtain the number N of battery cells whose difference between the effective voltage of the battery cell and the voltage reference value is greater than a preset difference;

[0079] 3. According to the total voltage Volt of the battery system total , the total effective voltage of all cells Volt1 total , get the difference volt between the total voltage of the battery system and the sum of the effective voltages of all cells off :

[0080] 4. When the difference volt is detected off The ratio of the number of cells N is greater than or equal to the preset difference volt thr hour, It is judged that the voltage data within a single frame time is abnormal;

[0081] 5. When it is detected that the ratio of the number of abnormal frames of the voltage data to the total number of frames in the preset monitoring time is greater than or equal to the preset proportion threshold, the battery cell whose maximum median difference or maximum average difference of the single frame time occurs the most times within the preset monitoring time is determined to be the abnormal battery cell.

[0082] See also Figure 4 As shown, the embodiment of the present invention further provides a battery voltage acquisition fault warning system 100, including: a voltage acquisition module 110, an abnormal frame number acquisition module 120 and an abnormal battery cell module 130;

[0083] The voltage acquisition module 110 is used to obtain the total voltage of the battery system and the effective voltage of each battery cell in each frame time within a preset monitoring time;

[0084] The abnormal frame number acquisition module 120 is in communication with the voltage acquisition module 110 and is used to acquire the abnormal frame number of voltage data according to the preset monitoring time, the total voltage of the battery system within each frame time, and the effective voltage of each battery cell; and

[0085] The abnormal cell module 130 is communicatively connected to the voltage acquisition module 110 and the abnormal frame number acquisition module 120, and is used to acquire the abnormal cell and issue a sampling fault warning signal when it is detected that the ratio of the abnormal frame number of the voltage data to the total frame number of the preset monitoring time is greater than or equal to a preset proportion threshold.

[0086] The abnormal frame number acquisition module 120 is used to obtain, within a single frame time, a voltage reference value of the effective voltages of all battery cells according to the effective voltage of each battery cell; obtain, according to the effective voltage of each battery cell and the voltage reference value, the number of battery cells whose difference between the effective voltage of the battery cell and the voltage reference value is greater than a preset difference; when it is detected that the difference between the total voltage of the battery system and the sum of the effective voltages of all battery cells and the ratio of the difference to the number of battery cells is greater than or equal to the preset difference, it is determined that the voltage data within a single frame time is abnormal; based on the preset monitoring time and the voltage data abnormality within a single frame time, the number of abnormal voltage data frames is obtained.

[0087] The abnormal cell module 130 is used to determine that the cell whose maximum median difference or maximum mean difference of a single frame time occurs most times within the preset monitoring time is an abnormal cell when it is detected that the ratio of the number of abnormal frames of the voltage data to the total number of frames within the preset monitoring time is greater than or equal to a preset proportion threshold.

[0088] Therefore, the present invention first obtains the total voltage of the battery system and the effective voltage of each battery cell in each frame time within the preset monitoring time; then obtains the number of abnormal frames of voltage data according to the preset monitoring time, the total voltage of the battery system in each frame time and the effective voltage of each battery cell; finally, when it is detected that the ratio of the number of abnormal frames of voltage data to the total number of frames in the preset monitoring time is greater than or equal to the preset proportion threshold, the abnormal battery cell is obtained and a sampling fault warning signal is issued; therefore, the abnormal battery cell can be obtained in time, and a sampling fault warning signal can be issued, so that the battery is in a safe operating state.

[0089] Specifically, this embodiment corresponds one-to-one to the above method embodiment, and the functions of each module have been described in detail in the corresponding method embodiment, so they will not be repeated here.

[0090] Based on the same inventive concept, an 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, all or part of the method steps of the above method are implemented.

[0091] The present invention implements all or part of the process in the above method, and can also be completed by instructing related hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by a processor, the steps of each of the above method embodiments can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying computer program code, recording medium, USB flash drive, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electric carrier signals and telecommunication signals.

[0092] Based on the same inventive concept, an embodiment of the present application also provides an electronic device, including a memory and a processor, wherein the memory stores a computer program running on the processor, and when the processor executes the computer program, all or part of the method steps in the above method are implemented.

[0093] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc. The processor is the control center of a computer device, and uses various interfaces and lines to connect various parts of the entire computer device.

[0094] The memory can be used to store computer programs and / or modules. The processor realizes various functions of the computer device by running or executing the computer programs and / or modules stored in the memory, and calling the data stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system and at least one application required for a function (such as a sound playback function, an image playback function, etc.); the data storage area can store data created according to the use of the mobile phone (such as audio data, video data, etc.). In addition, the memory can include a high-speed random access memory, and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (SmartMedia Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0095] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, servers or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, 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 disk storage and optical storage, etc.) containing computer-usable program codes.

[0096] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), servers, and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as a combination of processes and / or blocks in the flowchart and / or block diagram, 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 flowchart and / or block diagram. 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.

[0097] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate 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 A function specified in one or more boxes.

[0098] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0099] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A battery voltage acquisition fault early warning method, characterized in that: The following steps are involved: Obtain the total voltage of the battery system and the effective voltage of each battery cell at each frame time within the preset monitoring time; According to the preset monitoring time, the total voltage of the battery system within each frame time and the effective voltage of each battery cell, the number of abnormal frames of voltage data is obtained; When it is detected that the ratio of the number of abnormal frames of the voltage data to the total number of frames of the preset monitoring time is greater than or equal to a preset proportion threshold, the abnormal battery cell is obtained and a sampling fault warning signal is issued; The step of "obtaining the number of abnormal frames of voltage data according to the preset monitoring time, the total voltage of the battery system within each frame time, and the effective voltage of each battery cell" specifically includes the following steps: In a single frame time; According to each of the battery cell effective voltages, a voltage reference value of the effective voltages of all the battery cells is obtained; According to the effective voltage of each battery cell and the voltage reference value, obtaining the number of battery cells whose difference between the effective voltage of the battery cell and the voltage reference value is greater than a preset difference; When it is detected that the difference between the total voltage of the battery system and the sum of the effective voltages of all the battery cells and the ratio of the difference to the number of battery cells is greater than or equal to a preset difference, it is determined that the voltage data within a single frame time is abnormal; According to the voltage data abnormality within the preset monitoring time and single frame time, the number of voltage data abnormal frames is obtained.

2. The battery voltage acquisition failure early warning method according to claim 1, characterized in that: The step of "obtaining a voltage reference value of the effective voltages of all the battery cells according to each of the effective voltages of the battery cells; and obtaining the number of battery cells whose difference between the effective voltage of the battery cell and the voltage reference value is greater than a preset difference according to each of the effective voltages of the battery cells and the voltage reference value" specifically includes the following steps: According to each of the battery cell effective voltages, the voltage median of all battery cell effective voltages is obtained; and the number of battery cells whose median difference between the battery cell effective voltage and the voltage median is greater than a preset difference is obtained; or, According to each of the battery cell effective voltages, an average voltage of all the battery cell effective voltages is obtained; and the number of battery cells whose average difference between the battery cell effective voltage and the voltage average is greater than a preset difference is obtained.

3. The battery voltage acquisition failure early warning method according to claim 2, characterized in that: The step of "obtaining an abnormal battery cell when it is detected that the ratio of the number of abnormal frames of the voltage data to the total number of frames of the preset monitoring time is greater than or equal to a preset proportion threshold value" specifically includes the following steps: When it is detected that the ratio of the number of abnormal frames of the voltage data to the total number of frames in the preset monitoring time is greater than or equal to the preset proportion threshold, the battery cell whose maximum median difference or maximum average difference of the single frame time occurs the most times in the preset monitoring time is determined to be the abnormal battery cell.

4. The battery voltage acquisition failure early warning method according to claim 1, characterized in that: The step of "obtaining the effective voltage of each battery cell within a preset monitoring time" specifically includes the following steps: Obtain the initial voltage of each battery cell within the preset monitoring time; When it is detected that the initial voltage of the battery cell is within a preset voltage range, the initial voltage of the battery cell is determined to be an effective voltage of the battery cell; When it is detected that the initial voltage of the battery cell is not within the preset voltage range, a sampling failure warning signal is issued.

5. The battery voltage acquisition failure early warning method according to claim 1, characterized in that: The preset difference is set to 0.2V, and the preset proportion threshold is set to 10%.

6. A battery voltage acquisition fault warning system, characterized in that: include: The voltage acquisition module is used to obtain the total voltage of the battery system and the effective voltage of each battery cell in each frame time within the preset monitoring time; An abnormal frame number acquisition module is connected to the voltage acquisition module for acquiring abnormal frames of voltage data according to a preset monitoring time, the total voltage of the battery system within each frame time, and the effective voltage of each battery cell; as well as, An abnormal cell module is connected to the voltage acquisition module and the abnormal frame number acquisition module for acquiring abnormal cells and sending a sampling fault warning signal when it is detected that the ratio of the abnormal frame number of the voltage data to the total frame number of the preset monitoring time is greater than or equal to a preset proportion threshold; The abnormal frame number acquisition module is used to obtain, within a single frame time, a voltage reference value of the effective voltages of all the battery cells according to the effective voltage of each battery cell; obtain, according to the effective voltage of each battery cell and the voltage reference value, the number of battery cells whose difference between the effective voltage of the battery cell and the voltage reference value is greater than a preset difference; when it is detected that the difference between the total voltage of the battery system and the sum of the effective voltages of all the battery cells and the ratio of the difference to the number of battery cells is greater than or equal to the preset difference, it is determined that the voltage data within a single frame time is abnormal; According to the voltage data abnormality within the preset monitoring time and single frame time, the number of voltage data abnormal frames is obtained.

7. The battery voltage acquisition fault warning system according to claim 6, characterized in that: The abnormal battery cell module is used to determine that the battery cell whose maximum median difference or maximum mean difference of single frame time occurs most times within the preset monitoring time is a valid abnormal battery cell when it is detected that the ratio of the number of abnormal frames of the voltage data to the total number of frames within the preset monitoring time is greater than or equal to a preset proportion threshold.

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