CN116736123A - Power battery signal acquisition fault diagnosis method and device, medium and electronic equipment - Google Patents

Power battery signal acquisition fault diagnosis method and device, medium and electronic equipment Download PDF

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Publication number
CN116736123A
CN116736123A CN202210194770.9A CN202210194770A CN116736123A CN 116736123 A CN116736123 A CN 116736123A CN 202210194770 A CN202210194770 A CN 202210194770A CN 116736123 A CN116736123 A CN 116736123A
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China
Prior art keywords
voltage value
battery
value
deviation
cell
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罗海灵
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Beijing Chehejia Automobile Technology Co Ltd
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Beijing Chehejia Automobile Technology Co Ltd
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Priority to CN202210194770.9A priority Critical patent/CN116736123A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/367—Software therefor, e.g. for battery testing using modelling or look-up tables
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/378—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] specially adapted for the type of battery or accumulator
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • G01R31/3835—Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)

Abstract

The embodiment of the disclosure relates to a power battery signal acquisition fault diagnosis method, a device, a storage medium and electronic equipment, wherein the method comprises the following steps: acquiring voltage values of all battery cores of the power battery; if the maximum voltage value and the minimum voltage value in the voltage values of the battery cells at the same time are larger than a preset voltage difference value, judging whether the battery cell corresponding to the maximum voltage value and the battery cell corresponding to the minimum voltage value are adjacent battery cells or not; if so, generating prompt information according to the deviation degree of the maximum voltage value and the average voltage value of the battery cell and/or the deviation degree of the minimum voltage value and the average voltage value of the battery cell. The embodiment of the disclosure can be used for monitoring the running state of the power battery, accurately identifying whether the power battery has the hardware signal acquisition problem or not, and effectively improving the processing efficiency of the power battery fault problem.

Description

Power battery signal acquisition fault diagnosis method and device, medium and electronic equipment
Technical Field
The disclosure relates to the technical field of batteries, in particular to a power battery signal acquisition fault diagnosis method, a device, a medium and electronic equipment.
Background
In recent years, development of electric vehicles has attracted high attention, and the reliability, stability and service life of a power battery pack as an energy storage center of the electric vehicle directly affect the performance of the electric vehicle. The power battery pack in the electric automobile is generally formed by connecting tens or hundreds of battery cells in series and parallel so as to meet the voltage and power requirements of the electric automobile on a power source. In order to ensure the use safety of the power battery pack, the working parameters of the battery cells need to be detected and monitored in real time, and the fault problem of the power battery pack is discovered and processed in time.
In the related art, a case of excessive voltage difference exists in a battery system identified based on cloud data, wherein a part of cases are caused by the fact that the voltages of the battery cells at two adjacent positions in the battery pack are higher or lower and deviate from an average value, and the battery pack can be disassembled for investigation and then can be positioned as a hardware signal acquisition problem, but the problem of consistency of the battery cells is not involved. The current failure detection mode has low processing efficiency and can not accurately locate the cause of the failure of the battery system in time. Therefore, it is necessary to design a battery system fault diagnosis method to effectively solve the existing technical problems.
Disclosure of Invention
In order to solve the technical problems, the disclosure provides a power battery signal acquisition fault diagnosis method, a device, a medium and electronic equipment.
In a first aspect, the present disclosure provides a power battery signal acquisition fault diagnosis method, including:
acquiring voltage values of all battery cores of the power battery;
if the maximum voltage value and the minimum voltage value in the voltage values of the battery cells at the same time are larger than a preset voltage difference value, judging whether the battery cell corresponding to the maximum voltage value and the battery cell corresponding to the minimum voltage value are adjacent battery cells or not;
if so, generating prompt information according to the deviation degree of the maximum voltage value and the average voltage value of the battery cell and/or the deviation degree of the minimum voltage value and the average voltage value of the battery cell.
In some embodiments, the acquiring the voltage value of each cell of the power battery includes:
and acquiring the voltage value of each battery cell in a static state before the charging cycle or the discharging cycle of the power battery.
In some embodiments, the acquiring the voltage value of each cell of the power battery includes:
and acquiring the voltage value of each electric core of the power battery in the charging cycle and/or discharging cycle.
In some embodiments, the generating the prompt message according to the deviation degree of the maximum voltage value and the average voltage value of the battery cell and/or the deviation degree of the minimum voltage value and the average voltage value of the battery cell includes:
if the deviation value of the maximum voltage value and the average voltage value of the battery cell and/or the deviation value of the minimum voltage value and the average voltage value of the battery cell is larger than a first preset deviation threshold value and smaller than a second preset deviation threshold value, accumulating one early warning record;
if the deviation value of the maximum voltage value and the average voltage value of the battery cell and/or the deviation value of the minimum voltage value and the average voltage value of the battery cell is greater than or equal to the second preset deviation threshold value, accumulating a fault record;
wherein the second preset deviation threshold is greater than the first preset deviation threshold.
In some embodiments, further comprising:
judging whether the number of times of the early warning records is larger than a first preset number of times or not;
if so, judging whether the deviation degree of the maximum voltage value and the average voltage value of the battery cell within the preset time and/or the deviation degree of the minimum voltage value and the average voltage value of the battery cell gradually increases, and if so, generating a repair prompt.
In some embodiments, after the deviation value between the maximum voltage value and the average voltage value of the battery cell and/or the deviation value between the minimum voltage value and the average voltage value of the battery cell is greater than or equal to the second preset deviation threshold, accumulating a fault record, the method further includes:
and judging whether the times of the fault records are larger than a second preset times, and if so, generating a repair prompt.
In some embodiments, the first preset deviation threshold and the second preset deviation threshold are each integer multiples of a standard deviation of the voltage value; the average voltage value of the battery cells is the average voltage value except the maximum voltage value and the minimum voltage value in the voltage values of the battery cells at the same time, and the standard deviation of the voltage values is the standard deviation of the voltage values except the maximum voltage value and the minimum voltage value in the voltage values of the battery cells at the same time.
In a second aspect, the present disclosure also provides a power battery signal acquisition failure diagnosis apparatus, the apparatus comprising:
the voltage value acquisition module is used for acquiring the voltage value of each electric core of the power battery;
the adjacent cell judging module is used for judging whether the cell corresponding to the maximum voltage value and the cell corresponding to the minimum voltage value are adjacent cells or not if the difference between the maximum voltage value and the minimum voltage value in the voltage values of the cells at the same time is larger than a preset voltage difference value;
and the fault prompting module is used for generating prompting information according to the deviation degree of the maximum voltage value and the average voltage value of the battery cells and/or the deviation degree of the minimum voltage value and the average voltage value of the battery cells if the battery cell corresponding to the maximum voltage value and the battery cell corresponding to the minimum voltage value are adjacent battery cells.
In a third aspect, the present disclosure also provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the signal acquisition fault diagnosis method according to any of the embodiments described above.
In a fourth aspect, the present disclosure further provides an electronic device, including a memory and a processor, where the memory stores a computer program, and the processor implements the steps of the signal acquisition fault diagnosis method according to any of the embodiments described above when the computer program is executed.
Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:
the embodiment of the disclosure provides a power battery signal acquisition fault diagnosis method, a device, a medium and electronic equipment, wherein the method comprises the steps of obtaining voltage values of all battery cores of a power battery; if the difference between the maximum voltage value and the minimum voltage value in the voltage values of the cells at the same time is larger than a preset voltage difference value, judging whether the cell corresponding to the maximum voltage value and the cell corresponding to the minimum voltage value are adjacent cells or not; if so, generating prompt information according to the deviation degree of the maximum voltage value and the average voltage value of the battery cell and/or the deviation degree of the minimum voltage value and the average voltage value of the battery cell. Therefore, based on the voltage value of each cell in the power battery at the same time, calculating the difference value between the maximum voltage value and the minimum voltage value and comparing the difference value with a preset voltage difference value, and judging whether the cell corresponding to the obtained maximum voltage value and the obtained minimum voltage value is an adjacent cell or not when the difference value between the maximum voltage value and the minimum voltage value is larger than the preset voltage difference value; if the adjacent cells are adjacent, comparing the maximum voltage value and/or the minimum voltage value with the deviation degree of the average voltage value of the cells, and when the deviation degree is larger than a preset deviation value, considering that signal acquisition is problematic, and generating prompt information. Therefore, the embodiment of the disclosure accurately identifies whether a signal acquisition problem exists in the power battery based on the maximum cell voltage and the minimum cell voltage inside the battery and the position information of the distribution of the maximum cell voltage and the minimum cell voltage; and the reason that the power battery breaks down is accurately positioned in time, so that the power battery can be maintained conveniently aiming at the existing faults, and the processing efficiency of the fault problem in the power battery is effectively improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.
In order to more clearly illustrate the embodiments of the present disclosure or the solutions in the prior art, the drawings that are required for the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a flowchart of a power battery signal acquisition fault diagnosis method provided in an embodiment of the present disclosure;
FIG. 2 is a flowchart of another power battery signal acquisition fault diagnosis method provided by an embodiment of the present disclosure;
FIG. 3 is a flowchart of another power battery signal acquisition fault diagnosis method provided by an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a power battery signal acquisition fault diagnosis device according to an embodiment of the present disclosure.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, a further description of aspects of the present disclosure will be provided below. It should be noted that, without conflict, the embodiments of the present disclosure and features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced otherwise than as described herein; it will be apparent that the embodiments in the specification are only some, but not all, embodiments of the disclosure. All other embodiments derived by a person of ordinary skill in the art based on the described embodiments of the present disclosure fall within the scope of the present disclosure.
At present, in the case that the voltage difference of the battery cell is overlarge in the battery system identified based on cloud data, after the battery pack is disassembled for investigation, the specific fault problem of the battery system can be determined, and the fault investigation mode has low processing efficiency and can not accurately locate the cause of the fault of the battery system in time.
In order to solve the technical problems, the disclosed embodiments provide a power battery signal acquisition fault diagnosis method, device, medium and electronic equipment, which are used for monitoring the running state of a power battery, and can accurately identify whether the power battery has a signal acquisition fault problem or not, thereby effectively improving the processing efficiency of the fault problem in the power battery.
Fig. 1 is a flowchart of a signal acquisition fault diagnosis method of a power battery according to an embodiment of the present disclosure. In one particular application scenario, the method may be performed by a power battery signal acquisition fault diagnosis device, which may be disposed within a vehicle. In addition, the power battery signal acquisition fault diagnosis device can also be integrated in a cloud server, and the cloud server is used for communicating with a vehicle, for example, acquiring voltage values of all battery cells of a power battery of the vehicle. The method comprises the following steps:
s110, acquiring voltage values of all battery cores of the power battery;
the power battery is used as a core energy storage device of the electric automobile, and directly influences the endurance mileage of the electric automobile. The power battery generally comprises a large number of single batteries, each single battery can be combined in a serial, parallel or serial-parallel mode, and only a pair of positive and negative output terminals are arranged. In specific application, after single batteries of the same specification and model are grouped, the internal structure and the materials of the batteries are not completely consistent due to the technical problem, and certain performance differences of the power batteries in terms of voltage, capacity, internal resistance and the like can be caused. The battery cell is used as an important electric storage unit in the single battery, and the real-time state parameter of the battery cell directly reflects the real-time electricity storage and power supply condition of the power battery.
Therefore, the voltage value of each electric core in the power battery is acquired and used for acquiring the real-time state data of the electric core in the single battery, so that the power battery can be monitored in real time in electricity storage and power supply conditions, and each single battery can be ensured to work in a normal state.
It should be noted that, the obtaining of the voltage values of each cell in each group of power cells is performed at the same time, in practical application, the number of times and the frequency of obtaining the voltage values of each cell may be set correspondingly according to the actual monitoring requirement of the power cells, and the step S110 may be repeatedly performed for multiple times.
S120, if the difference between the maximum voltage value and the minimum voltage value in the voltage values of the battery cells at the same time is larger than the preset voltage difference value, judging whether the battery cell corresponding to the maximum voltage value and the battery cell corresponding to the minimum voltage value are adjacent battery cells;
specifically, based on the voltage values of the respective cells obtained in step S110, the maximum voltage value and the minimum voltage value thereof are determined and obtained, and the numbers of the cells having the maximum voltage value and the minimum voltage value are obtained. And carrying out difference operation according to the determined maximum voltage value and the determined minimum voltage value to obtain a cell measurement voltage difference value, comparing the cell measurement voltage difference value with a preset voltage difference value, and if the voltage difference value between the maximum voltage value and the minimum voltage value is smaller than or equal to the preset voltage difference value, considering that each cell voltage in the power battery collected at the monitoring moment is in a normal state, and the battery system is not faulty and has no hardware signal collection problem. If the voltage difference between the maximum voltage value and the minimum voltage value is larger than the preset voltage difference, the power battery is possibly failed, but the failure can not be distinguished to be the consistency failure of the battery core or the failure of voltage signal acquisition. Therefore, in step 120, the embodiment of the present disclosure determines whether the cell corresponding to the maximum voltage value and the cell corresponding to the minimum voltage value are adjacent cells, so as to distinguish between a cell consistency fault and a voltage signal acquisition fault. For example, the cell numbers corresponding to the maximum voltage value and the minimum voltage value can be obtained, whether the number difference of the two cells is equal to 1 is judged, and if so, the cell corresponding to the maximum voltage value and the cell corresponding to the minimum voltage value are determined to be adjacent cells. If the cell corresponding to the maximum voltage value and the cell corresponding to the minimum voltage value are adjacent cells, step S130 is performed.
It should be noted that the preset voltage difference may be 30mV or other voltage values, or may be adaptively set by those skilled in the art based on the threshold requirement of the voltage difference of the battery cells of the power battery, which is not limited in this disclosure.
S130, generating prompt information according to the deviation degree of the maximum voltage value and the average voltage value of the battery cell and/or the deviation degree of the minimum voltage value and the average voltage value of the battery cell.
Optionally, after removing the maximum voltage value and the minimum voltage value collected at the collection time, calculating an average value of the voltage values of the remaining battery cells, and taking the average value as the average voltage value of the battery cells at the collection time.
If the cell corresponding to the maximum voltage value and the cell corresponding to the minimum voltage value are adjacent cells, the fact that the voltage of the cell collected at the moment is suddenly high or suddenly low is caused by the voltage signal collection fault is indicated. Therefore, the prompt information can be generated according to the deviation degree of the maximum voltage value and the average voltage value of the battery cells and/or the deviation degree of the minimum voltage value and the average voltage value of the battery cells. For example, if the deviation degree of the maximum voltage value and the average voltage value of the battery cells and/or the deviation degree of the minimum voltage value and the average voltage value of the battery cells is greater than a certain value, then the voltage signal acquisition of the adjacent battery cells in the battery system is considered to be faulty at the monitoring moment, for example, prompt information of the fault of the voltage signal acquisition can be sent out, and the number of the battery cells corresponding to the fault of the voltage signal acquisition is displayed, so that the fault position can be accurately maintained in time.
Therefore, based on the voltage value of each cell in the battery system at the same time, acquiring the maximum voltage value and the minimum voltage value, calculating the difference value between the maximum voltage value and the minimum voltage value, comparing the difference value with a preset voltage difference value, and judging the cell number corresponding to the acquired maximum voltage value and the minimum voltage value to judge whether the cell is an adjacent cell or not when the difference value between the maximum voltage value and the minimum voltage value is larger than the preset voltage difference value; if the voltage is the adjacent battery cell, comparing the maximum voltage value and/or the minimum voltage value with the deviation degree of the average voltage value of the battery cell, and when the deviation degree is larger than the preset deviation value, the fault diagnosis system timely sends out corresponding fault prompt aiming at the existing fault problem. Therefore, the embodiment of the disclosure accurately identifies whether the hardware signal acquisition problem exists in the power battery based on the maximum cell voltage and the minimum cell voltage in the battery and the position information distributed by the maximum cell voltage and the minimum cell voltage, and when the power battery fails, the embodiment can timely send out corresponding fault prompt, thereby being convenient for accurately maintaining the existing faults and effectively improving the processing efficiency of the power battery failure problem.
In some embodiments, obtaining the voltage values for each cell of the power cell includes:
and acquiring the voltage value of each battery cell in a static state before the charging cycle or the discharging cycle of the power battery.
Specifically, before the power battery does not perform charge or discharge, collecting the voltage values of the battery cells in a static state, including determining the maximum voltage value and the minimum voltage value in the voltage values of the battery cells, obtaining the numbers of the battery cells with the maximum voltage value and the minimum voltage value, and calculating the average value of the voltages of the battery cells except the maximum voltage value and the minimum voltage value.
Therefore, the voltage value of each electric core in the power battery in the static state is obtained to monitor the running state of the power battery before the power battery does not execute work.
In some embodiments, obtaining the voltage values for each cell of the power cell includes:
and acquiring the voltage value of each electric core of the power battery in the charging cycle and/or discharging cycle.
Specifically, during the process of executing charge or discharge operation of the power battery, collecting the voltage values of each cell in a dynamic circulation state, including determining and obtaining the maximum voltage value and the minimum voltage value in the voltage values of each cell, obtaining the numbers of the cells with the maximum voltage value and the minimum voltage value, and simultaneously calculating and obtaining the average value of the voltages of other cells except the maximum voltage value and the minimum voltage value.
Therefore, the voltage value of each electric core in the power battery in the dynamic circulation state is obtained to monitor the running state of the power battery in the executing working process.
Fig. 2 is a flowchart of another power battery signal acquisition fault diagnosis method according to an embodiment of the present disclosure, referring to fig. 2, including S210 to S240:
s210, acquiring voltage values of all battery cores of the power battery;
s220, if the difference between the maximum voltage value and the minimum voltage value in the voltage values of the battery cells at the same time is larger than a preset voltage difference value, judging whether the battery cell corresponding to the maximum voltage value and the battery cell corresponding to the minimum voltage value are adjacent battery cells or not;
and if the cell corresponding to the maximum voltage value and the cell corresponding to the minimum voltage value are adjacent cells, executing S230 or S240.
And S230, accumulating one early warning record if the deviation value of the maximum voltage value and the average voltage value of the battery cell and/or the deviation value of the minimum voltage value and the average voltage value of the battery cell is larger than a first preset deviation threshold value and smaller than a second preset deviation threshold value.
S240, if the deviation value of the maximum voltage value and the average voltage value of the battery cells and/or the deviation value of the minimum voltage value and the average voltage value of the battery cells is greater than or equal to the second preset deviation threshold value, accumulating a fault record.
Wherein the second preset deviation threshold is greater than the first preset deviation threshold.
If the deviation value of the maximum voltage value and the average voltage value of the battery cell and/or the deviation value of the minimum voltage value and the average voltage value of the battery cell is larger than the first preset deviation threshold value and smaller than the second preset deviation threshold value, the maximum voltage value and the minimum voltage value are beyond the normal deviation threshold value range (the first preset deviation threshold value to the second preset deviation threshold value), and the signal acquisition fault is likely to happen. At this time, primary early warning can be performed, that is, an early warning record is accumulated once. If the deviation value of the maximum voltage value and the average voltage value of the battery cell and/or the deviation value of the minimum voltage value and the average voltage value of the battery cell is greater than or equal to a second preset deviation threshold value, the degree of the deviation of the maximum voltage value and the minimum voltage value from the average voltage value of the battery cell is severe, and the occurrence of the signal acquisition fault can be basically determined, so that a fault record can be accumulated at this time.
According to the embodiment of the application, the deviation degree of the maximum voltage value and the average voltage value of the battery cell and/or the deviation degree of the minimum voltage value and the average voltage value of the battery cell are recorded in a grading manner, so that whether the signal acquisition fault occurs can be accurately determined, and erroneous judgment is avoided.
Fig. 3 is a flowchart of another power battery signal acquisition fault diagnosis method according to an embodiment of the present disclosure, and referring to fig. 3, the method includes S310 to S370:
s310, acquiring voltage values of all battery cores of the power battery;
s320, if the difference between the maximum voltage value and the minimum voltage value in the voltage values of the battery cells at the same time is larger than a preset voltage difference value, judging whether the battery cell corresponding to the maximum voltage value and the battery cell corresponding to the minimum voltage value are adjacent battery cells;
and if the cell corresponding to the maximum voltage value and the cell corresponding to the minimum voltage value are adjacent cells, executing S330 or S340.
S330, if the deviation value of the maximum voltage value and the average voltage value of the battery cell and/or the deviation value of the minimum voltage value and the average voltage value of the battery cell is greater than a first preset deviation threshold value and less than a second preset deviation threshold value, accumulating one early warning record.
And the early warning record is used for recording and storing when the difference between the maximum voltage value and the minimum voltage value which appear for a plurality of times is larger than the first preset deviation threshold value and smaller than the second preset deviation threshold value in the process of monitoring the running state of the power battery, so that the inquiry during the subsequent maintenance is convenient.
And S340, if the deviation value of the maximum voltage value and the average voltage value of the battery cells and/or the deviation value of the minimum voltage value and the average voltage value of the battery cells is greater than or equal to the second preset deviation threshold value, accumulating a fault record.
S350, judging whether the times of the early warning records are larger than a first preset times.
If yes, S360 is executed.
S360, judging the deviation degree of the maximum voltage value and the average voltage value of the battery cell within preset time and/or judging whether the deviation degree of the minimum voltage value and the average voltage value of the battery cell gradually increases.
If yes, S370 is performed.
S370, generating a repair prompt.
It can be understood that the first preset times refer to times of allowing early warning situations to occur in the process of monitoring the running state of the power battery, and the preset times can be set correspondingly according to actual monitoring requirements of the power battery, which is not limited by the embodiment of the disclosure.
If the number of times of the early warning record is larger than the first preset number of times, the probability of occurrence of the signal acquisition fault is increased although the deviation degree is not serious, and whether the situation is the signal acquisition fault is accurately judged. The embodiment of the application can further judge the deviation degree of the maximum voltage value and the average voltage value of the battery cell in the preset time and/or whether the deviation degree of the minimum voltage value and the average voltage value of the battery cell is gradually increased, if so, the power battery is determined to have signal acquisition failure, a repair prompt is generated, and the after-sale repair is notified.
For example, the voltage values of each cell of the power battery at N acquisition times in one day are obtained. T (T) 1 The deviation degree of the maximum voltage value and the average voltage value of the battery cells and the deviation degree of the minimum voltage value and the average voltage value of the battery cells of the power battery at the moment are delta 1 。T 2 The deviation degree of the maximum voltage value and the average voltage value of the battery cells and the deviation degree of the minimum voltage value and the average voltage value of the battery cells of the power battery at the moment are delta 2 ，…，T N The deviation degree of the maximum voltage value and the average voltage value of the battery cells and the deviation degree of the minimum voltage value and the average voltage value of the battery cells of the power battery at the moment are delta N . When (delta) 1 <△ 2 <…<△ N When the deviation degree of the maximum voltage value of the power battery and the average voltage value of the battery core and the deviation degree of the minimum voltage value and the average voltage value of the battery core are gradually increased in N acquisition moments in one day, the fact that the deviation degree is not larger than a second preset deviation threshold value but the acquisition of the voltage signals of the battery core is problematic is indicated, and therefore a repair prompt is generated to inform after-sale repair, and accuracy of signal acquisition fault interpretation is improved.
Optionally, for example, referring to fig. 3, in the power battery signal acquisition fault diagnosis method provided in the embodiment of the present disclosure, after S330, a deviation value between the maximum voltage value and the average voltage value of the battery cell and/or a deviation value between the minimum voltage value and the average voltage value of the battery cell is greater than or equal to the second preset deviation threshold, after accumulating a fault record, the method may further include:
s380, judging whether the times of the fault records are larger than a second preset times.
If yes, S370 is performed.
When the number of faults recorded in the fault record is greater than the second preset number, a repair prompt can be sent out and the position of the corresponding fault can be displayed. If the number of times of fault record is larger than the second preset number of times, the judgment number of times that the deviation degree of the voltage value of the adjacent battery cells and the average voltage value of the battery cells is larger reaches the set number of times. For example, the number of times of fault recording is monitored in one day, if the number of times of fault recording only happens once and twice, it may be an accidental event, if it is directly determined that the signal acquisition fault is likely to cause erroneous determination, if the number of times of fault recording monitored in one day is greater than a second preset number of times (for example, 20 times), it is indicated that the probability of occurrence of the signal acquisition fault is very high, and thus the signal acquisition fault may be determined.
It can be understood that the second preset number of times refers to the number of times of allowing a fault condition to occur during the process of monitoring the operation state of the power battery, and the preset number of times can be adaptively set according to the actual monitoring requirement of the power battery, which is not limited in this embodiment of the disclosure.
In the embodiment of the disclosure, the average voltage value of the battery cells may be, for example, the average voltage value of each battery cell at the same time. For example, the power battery includes 100 battery cells in total, 100 corresponding voltage values are collected at the time T, and the voltage value of the 100 voltage values can be calculated as the average voltage value of the battery cells at the time T.
The first preset deviation threshold and the second preset deviation threshold may be preset fixed values, for example.
In some embodiments, the first preset deviation threshold and the second preset deviation threshold may be integer multiples of the standard deviation of the voltage values. The average voltage value of the battery cells is the average voltage value except the maximum voltage value and the minimum voltage value in the voltage values of the battery cells at the same time, and the standard deviation of the voltage values is the standard deviation of the voltage values except the maximum voltage value and the minimum voltage value in the voltage values of the battery cells at the same time.
When the average voltage value and the standard deviation of the voltage values of the battery cells are determined, the average voltage value except the maximum voltage value and the minimum voltage value in the voltage values of each battery cell at the moment is removed, so that the influence of acquisition faults on judgment data is eliminated. In addition, the first preset deviation threshold value and the second preset deviation threshold value are integer multiples of the standard deviation of the voltage value. For example, the first preset deviation threshold is 3σ and the second preset deviation threshold is 6σ. Sigma is the standard deviation of the voltage value. The first preset deviation threshold value and the second preset deviation threshold value can be timely adjusted according to the working condition of the power battery, so that the dynamic judgment of the signal acquisition failure of the power battery is more met.
Fig. 4 is a diagram of a power battery signal acquisition fault diagnosis device provided by an embodiment of the present disclosure, and referring to fig. 4, an embodiment of the present disclosure further provides a power battery signal acquisition fault diagnosis device, where the device includes:
the voltage value acquisition module 11 is configured to acquire a voltage value of each cell of the power battery.
The adjacent cell judging module 12 is configured to judge whether the cell corresponding to the maximum voltage value and the cell corresponding to the minimum voltage value are adjacent cells if the difference between the maximum voltage value and the minimum voltage value in the voltage values of the cells at the same time is greater than the preset voltage difference.
The fault prompting module 13 is configured to generate a prompting message according to a deviation degree of the maximum voltage value and the average voltage value of the battery cells and/or a deviation degree of the minimum voltage value and the average voltage value of the battery cells if the battery cell corresponding to the maximum voltage value and the battery cell corresponding to the minimum voltage value are adjacent battery cells.
The voltage value acquisition module acquires the voltage value of each cell in the power battery, determines the maximum voltage value and the minimum voltage value of the power battery, acquires the numbers of the cells with the maximum voltage value and the minimum voltage value, and calculates the average value of the voltages of other cells except the maximum voltage value and the minimum voltage value; combining adjacent cell judgment modules, and further judging whether the cell corresponding to the maximum voltage value and the cell corresponding to the minimum voltage value are adjacent cells or not when the difference between the maximum voltage value and the minimum voltage value in the voltage values of the cells at the same moment is larger than a preset voltage difference value; and generating prompt information by using the fault prompt module according to the deviation degree of the maximum voltage value and the average voltage value of the battery cell and/or the deviation degree of the minimum voltage value and the average voltage value of the battery cell. Therefore, the power battery signal acquisition fault diagnosis device provided by the embodiment of the disclosure judges whether the power battery is an adjacent power battery based on the power battery corresponding to the maximum voltage value and the minimum voltage value of the voltage values of the power battery acquired at the same moment, and accurately identifies whether a hardware signal acquisition fault problem exists in the power battery according to the deviation degree of the maximum voltage value and the average voltage value of the power battery and/or the deviation degree of the minimum voltage value and the average voltage value of the power battery, so that corresponding fault prompt can be timely sent out when the hardware signal acquisition fault exists, accurate maintenance is convenient for specific faults, and the processing efficiency of the power battery fault problem is effectively improved.
In some embodiments, the voltage value obtaining module is specifically configured to obtain the voltage value of each cell in a static state of the power battery before a charging cycle or a discharging cycle.
In some embodiments, the voltage value acquisition module is specifically configured to acquire a voltage value of each cell of the power battery during a charging cycle and/or a discharging cycle.
In some embodiments, the fault prompting module is specifically configured to accumulate an early warning record if the deviation value between the maximum voltage value and the average voltage value of the battery cell and/or the deviation value between the minimum voltage value and the average voltage value of the battery cell is greater than a first preset deviation threshold and less than a second preset deviation threshold; if the deviation value of the maximum voltage value and the average voltage value of the battery cell and/or the deviation value of the minimum voltage value and the average voltage value of the battery cell is greater than or equal to the second preset deviation threshold value, accumulating a fault record; wherein the second preset deviation threshold is greater than the first preset deviation threshold.
In some embodiments, the system further includes a first repair prompting module, configured to determine whether the number of times of the early warning record is greater than a first preset number of times; if so, judging whether the deviation degree of the maximum voltage value and the average voltage value of the battery cell within the preset time and/or the deviation degree of the minimum voltage value and the average voltage value of the battery cell gradually increases, and if so, generating a repair prompt.
In some embodiments, the method further includes a second repair prompting module, configured to determine whether the number of times of the fault record is greater than a second preset number of times, and if so, generate a repair prompt.
In some embodiments, optionally, the first preset deviation threshold and the second preset deviation threshold are each integer multiples of a standard deviation of the voltage value; the average voltage value of the battery cells is the average voltage value except the maximum voltage value and the minimum voltage value in the voltage values of the battery cells at the same time, and the standard deviation of the voltage values is the standard deviation of the voltage values except the maximum voltage value and the minimum voltage value in the voltage values of the battery cells at the same time.
In an embodiment of the present disclosure, there is also provided a computer-readable storage medium, on which a computer program is stored, which when executed by a processor, implements the steps of any of the methods of the embodiments described above.
It should be noted that examples of computer readable storage media include, but are not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or combinations of any of the above. More specific examples (a non-exhaustive list) of the readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access Memory (Random Access Memory, RAM), a Read-Only Memory (ROM), an erasable programmable Read-Only Memory (Electrical Programmable Read Only Memory, EPROM), an optical fiber, a portable compact disc Read-Only Memory (Compact Disc Read-Only Memory, CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
In this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
The computer storage medium provided by the above-described embodiments of the present disclosure and the signal acquisition failure diagnosis method of the power battery provided by the embodiments of the present disclosure have the same advantageous effects as the method adopted, operated or implemented by the application program or instruction stored therein, because of the same inventive concept.
In an embodiment of the present disclosure, there is also provided an electronic device including a memory and a processor, the memory storing a computer program, the processor implementing the steps of any of the methods of the embodiments described above when executing the computer program.
It should be noted that, the electronic device may be a cloud server corresponding to the power battery provided by the embodiment of the present disclosure, and the cloud server is used to locate each section of operation condition of the vehicle, and then execute the signal acquisition fault diagnosis method of the power battery provided by the embodiment of the present disclosure, so as to accurately identify whether a hardware signal acquisition problem exists in the power battery; when a power battery fault exists, a corresponding fault prompt can be timely sent out, accurate maintenance can be conveniently carried out aiming at the existing specific fault, and the treatment efficiency of the power battery fault problem is effectively improved.
In other embodiments, the electronic device may also be a controller located in the vehicle, and may also be capable of executing the method for diagnosing the signal acquisition failure of the power battery provided by the embodiments of the present disclosure, which are not limited in this disclosure.
It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.
The above is merely a specific embodiment of the disclosure to enable one skilled in the art to understand or practice the disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. The power battery signal acquisition fault diagnosis method is characterized by comprising the following steps of:
acquiring voltage values of all battery cores of the power battery;
if the difference between the maximum voltage value and the minimum voltage value in the voltage values of the cells at the same time is larger than a preset voltage difference value, judging whether the cell corresponding to the maximum voltage value and the cell corresponding to the minimum voltage value are adjacent cells or not;
if so, generating prompt information according to the deviation degree of the maximum voltage value and the average voltage value of the battery cell and/or the deviation degree of the minimum voltage value and the average voltage value of the battery cell.
2. The method of claim 1, wherein the obtaining the voltage values of the cells of the power cell comprises:
and acquiring the voltage value of each battery cell in a static state before the charging cycle or the discharging cycle of the power battery.
3. The method of claim 1, wherein the obtaining the voltage values of the cells of the power cell comprises:
and acquiring the voltage value of each electric core of the power battery in the charging cycle and/or discharging cycle.
4. The method according to claim 1, wherein generating the hint information according to the degree of deviation of the maximum voltage value from the average cell voltage value and/or the degree of deviation of the minimum voltage value from the average cell voltage value comprises:
if the deviation value of the maximum voltage value and the average voltage value of the battery cell and/or the deviation value of the minimum voltage value and the average voltage value of the battery cell is larger than a first preset deviation threshold value and smaller than a second preset deviation threshold value, accumulating one early warning record;
if the deviation value of the maximum voltage value and the average voltage value of the battery cell and/or the deviation value of the minimum voltage value and the average voltage value of the battery cell is greater than or equal to the second preset deviation threshold value, accumulating a fault record;
wherein the second preset deviation threshold is greater than the first preset deviation threshold.
5. The method as recited in claim 4, further comprising:
judging whether the number of times of the early warning records is larger than a first preset number of times or not;
if so, judging whether the deviation degree of the maximum voltage value and the average voltage value of the battery cell within the preset time and/or the deviation degree of the minimum voltage value and the average voltage value of the battery cell gradually increases, and if so, generating a repair prompt.
6. The method according to claim 4, wherein after accumulating a fault record, the deviation value between the maximum voltage value and the average cell voltage value, and/or the deviation value between the minimum voltage value and the average cell voltage value is greater than or equal to the second preset deviation threshold value, further comprises:
and judging whether the times of the fault records are larger than a second preset times, and if so, generating a repair prompt.
7. The method of claim 4, wherein the first preset deviation threshold and the second preset deviation threshold are each an integer multiple of a standard deviation of voltage values; the average voltage value of the battery cells is the average voltage value except the maximum voltage value and the minimum voltage value in the voltage values of the battery cells at the same time, and the standard deviation of the voltage values is the standard deviation of the voltage values except the maximum voltage value and the minimum voltage value in the voltage values of the battery cells at the same time.
8. A power battery signal acquisition failure diagnosis device, characterized by comprising:
the voltage value acquisition module is used for acquiring the voltage value of each electric core of the power battery;
the adjacent cell judging module is used for judging whether the cell corresponding to the maximum voltage value and the cell corresponding to the minimum voltage value are adjacent cells or not if the maximum voltage value and the minimum voltage value in the voltage values of the cells at the same time are larger than a preset voltage difference value;
and the fault prompting module is used for generating prompting information according to the deviation degree of the maximum voltage value and the average voltage value of the battery cells and/or the deviation degree of the minimum voltage value and the average voltage value of the battery cells if the battery cell corresponding to the maximum voltage value and the battery cell corresponding to the minimum voltage value are adjacent battery cells.
9. A computer-readable storage medium, characterized in that the storage medium has stored thereon a computer program which, when executed by a processor, implements the steps of the method of any of claims 1 to 7.
10. An electronic device comprising a memory storing a computer program and a processor implementing the steps of the method of any one of claims 1 to 7 when the computer program is executed by the processor.
CN202210194770.9A 2022-03-01 2022-03-01 Power battery signal acquisition fault diagnosis method and device, medium and electronic equipment Pending CN116736123A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117169753A (en) * 2023-11-03 2023-12-05 合肥国轩高科动力能源有限公司 Method and device for determining parameters of electric connection pieces of batteries connected in series and electronic equipment

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117169753A (en) * 2023-11-03 2023-12-05 合肥国轩高科动力能源有限公司 Method and device for determining parameters of electric connection pieces of batteries connected in series and electronic equipment
CN117169753B (en) * 2023-11-03 2024-03-08 合肥国轩高科动力能源有限公司 Method and device for determining parameters of electric connection pieces of batteries connected in series and electronic equipment

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