CN115575846B - Method, device, equipment and medium for detecting health state of battery pack - Google Patents
Method, device, equipment and medium for detecting health state of battery pack Download PDFInfo
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- 230000036541 health Effects 0.000 title claims abstract description 101
- 238000000034 method Methods 0.000 title claims abstract description 61
- 238000001514 detection method Methods 0.000 claims abstract description 258
- 238000012360 testing method Methods 0.000 claims abstract description 241
- 230000002159 abnormal effect Effects 0.000 claims abstract description 28
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 115
- 229910052744 lithium Inorganic materials 0.000 claims description 115
- 230000006870 function Effects 0.000 claims description 19
- 238000009413 insulation Methods 0.000 claims description 14
- 238000004590 computer program Methods 0.000 claims description 13
- 230000003862 health status Effects 0.000 claims description 9
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- 238000004364 calculation method Methods 0.000 claims description 2
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- 238000004891 communication Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 239000012855 volatile organic compound Substances 0.000 description 6
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- 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]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
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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]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention provides a method, a device, equipment and a medium for detecting the health state of a battery pack, which relate to the technical field of battery detection and comprise the following steps: detecting n test items of the battery pack to obtain detection data of each test item; wherein n is an integer greater than 1, and the battery pack comprises at least two single batteries; generating a detection score for each test item based on the detection data for each test item; calculating the comprehensive detection score of the battery pack based on the detection score of each test item and the preset score duty ratio of each test item; determining that the health state of the battery pack is normal under the condition that the comprehensive detection score is in a preset first range; and determining that the health state of the battery pack is abnormal in the case that the integrated detection score is not within the first range. The embodiment of the invention detects by taking the battery pack as a unit, reduces the detection data quantity and improves the detection efficiency of the health state of the battery pack.
Description
Technical Field
The present invention relates to the field of battery detection technologies, and in particular, to a method, an apparatus, a device, and a medium for detecting a health status of a battery pack.
Background
The lithium battery used by the electric bicycle has the advantages of high specific energy, light weight, quick power conversion and the like, and is widely applied to the electric bicycle. However, since the lithium battery stores more energy, when accidents such as short circuit, overcurrent and breakage occur, the lithium battery can instantly release the energy, fire and explosion are very easy to occur, and the life and property safety of people are seriously affected, so that the state detection of the lithium battery becomes important, and the electric vehicle lithium battery with hidden danger can be timely found by the electric vehicle lithium battery detection device, so that the occurrence of danger is prevented.
In the existing lithium battery health evaluation scheme, the single battery is usually detected, and detection data are analyzed to obtain the health state of the single battery.
However, if the lithium battery pack needs to be detected and the health state of the lithium battery pack is analyzed, the data amount of the detected data is multiplied along with the increase of the number of the single batteries in the lithium battery pack, so that the data analysis time is long, and the detection efficiency of the health state of the lithium battery pack is low.
Disclosure of Invention
The invention provides a method, a device, equipment and a medium for detecting the health state of a battery pack, which are used for solving the problem of low detection efficiency of the health state of a lithium battery pack in the prior art.
The invention provides a method for detecting the health state of a battery pack, which comprises the following steps:
detecting n test items of the battery pack to obtain detection data of each test item; wherein n is an integer greater than 1, and the battery pack comprises at least two single batteries;
generating a detection score for each test item based on the detection data for each test item;
calculating the comprehensive detection score of the battery pack based on the detection score of each test item and the preset score duty ratio of each test item;
determining that the health state of the battery pack is normal under the condition that the comprehensive detection score is in a preset first range;
and determining that the health state of the battery pack is abnormal in the case that the integrated detection score is not within the first range.
According to the method for detecting the health state of the battery pack, provided by the invention, the method further comprises the following steps:
judging whether the detection score of each test item is in a preset second range corresponding to each test item under the condition that the comprehensive detection score is not in the first range;
And acquiring test items which are not in the second range from the n test items, and displaying the abnormal items on a visual page as the abnormal items of the battery pack.
According to the method for detecting the health state of the battery pack, the n test items comprise at least one of the following:
a charge and discharge interface fault test item;
a lithium battery pack total voltage test item;
a lithium battery pack internal resistance test item;
a lithium battery overcurrent protection function test item;
a lithium battery pack insulation resistance test item;
and a lithium battery pack leakage test item.
According to the method for detecting the health state of the battery pack, provided by the invention, in the case that the n test items comprise the total voltage test item of the lithium battery pack, the n test items of the battery pack are detected, and detection data of each test item are obtained, wherein the method comprises the following steps:
measuring the current voltage between two lugs of the battery pack and the current electric quantity of the battery pack as the detection data;
the generating the detection score of each test item based on the detection data of each test item includes:
determining whether the current voltage is in a voltage normal range corresponding to the current electric quantity or not based on the current voltage, the current electric quantity and a preset corresponding relation between the voltage normal range and the electric quantity of the battery pack;
Under the condition that the current voltage is in the normal range of the voltage corresponding to the current electric quantity, adopting a formula (1) to generate the detection score of the total voltage test item of the lithium battery pack
：
wherein ,
representing a preset voltage average value corresponding to the current electric quantity,
the present voltage is characterized in that,
the first parameter factor is characterized.
According to the method for detecting the health state of the battery pack, provided by the invention, in the case that the n test items comprise the internal resistance test items of the lithium battery pack, the n test items of the battery pack are detected, and detection data of each test item are obtained, wherein the method comprises the following steps:
measuring the current internal resistance of the battery pack as the detection data;
the generating the detection score of each test item based on the detection data of each test item includes:
determining whether the current internal resistance is within a preset normal range of the internal resistance of the battery pack;
under the condition that the current internal resistance is within the normal range of the internal resistance, adopting a formula (2) to generate a detection score of the internal resistance test item of the lithium battery pack
：
wherein ,
representing a preset internal resistance average value,
characterizing the current internal resistance of the vehicle,
the second parameter factor is characterized.
According to the method for detecting the health state of the battery pack, in the case that the n test items include the lithium battery pack overcurrent protection function test item, the detecting the n test items of the battery pack to obtain the detection data of each test item includes:
controlling the battery pack to discharge at a first current in a discharge loop of the battery pack; wherein the first current is greater than a maximum allowable discharge current of the battery pack;
detecting a second current in the discharge loop;
acquiring the overcurrent time of the second current in a preset current normal range of the battery pack as the detection data;
the generating the detection score of each test item based on the detection data of each test item includes:
based on the overcurrent time, generating a detection score of the lithium battery pack overcurrent protection function test item by adopting a formula (3)
：
wherein ,
characterizing the flow time.
According to the method for detecting the health state of the battery pack, the comprehensive detection score of the battery pack is calculated based on the detection score of each test item and the preset score ratio of each test item, and the method comprises the following steps:
Detection score based on each of the test items
And the fraction ratio of each preset test item
Calculating the comprehensive detection score of the battery pack by adopting a formula (4)
：
wherein ,
characterizing the nth test item of the n test items
And test items.
The invention also provides a device for detecting the health state of the battery pack, which comprises:
the detection module is used for detecting n test items of the battery pack and obtaining detection data of each test item; wherein n is an integer greater than 1, and the battery pack comprises at least two single batteries;
the generation module is used for generating detection scores of the test items based on the detection data of the test items;
the calculation module is used for calculating the comprehensive detection score of the battery pack based on the detection score of each test item and the preset score duty ratio of each test item;
a determining module, configured to determine that the health status of the battery pack is normal if the integrated detection score is within a preset first range; and determining that the health state of the battery pack is abnormal in the case that the integrated detection score is not within the first range.
The invention also provides an electronic device comprising a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the method for detecting the health state of the battery pack according to any one of the above when executing the program.
The present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a method of detecting a state of health of a battery pack as described in any of the above.
The invention also provides a computer program product comprising a computer program which when executed by a processor implements a method of detecting the state of health of a battery as described in any of the above.
According to the method, the device, the equipment and the medium for detecting the health state of the battery pack, the battery pack is used as a unit for detection, so that the data amount of detection data obtained by detection can be effectively reduced compared with that of the battery pack used as a unit for detection in the related art, and further the health state of the battery pack can be analyzed based on the detection data with less data amount, the data analysis time is effectively shortened, and the detection efficiency of the health state of the battery pack is improved; in addition, compared with the method of determining the health state of the battery pack by modeling a battery model and the like in the related art, the method and the device of determining the health state of the battery pack based on the detection scores corresponding to the detection data of each test item and the score duty ratio corresponding to the detection scores calculate the comprehensive detection scores of the battery pack, and further determine the health state of the battery pack according to the comprehensive detection scores, so that the determination flow of the health state of the battery pack is effectively simplified, and the detection efficiency of the health state of the battery pack is further improved.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of a method for detecting a health state of a battery pack according to the present invention;
fig. 2 is a schematic diagram of a corresponding curve between a total voltage and a residual capacity of the lithium battery provided by the invention;
FIG. 3 is a second flow chart of the method for detecting the state of health of a battery pack according to the present invention;
fig. 4 is a schematic structural diagram of a device for detecting a health state of a battery pack according to the present invention;
fig. 5 is a schematic structural diagram of an electronic device provided by the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The method, the device, the equipment and the medium for detecting the health state of the battery pack are described below with reference to the accompanying drawings.
Fig. 1 is a schematic flow chart of a method for detecting a health state of a battery pack according to the present invention, as shown in fig. 1, the method for detecting a health state of a battery pack includes steps 101 to 105; wherein:
102, generating detection scores of the test items based on detection data of the test items;
It should be noted that, the method for detecting the health state of the battery pack provided by the embodiment of the invention can be applied to a detection device arranged outside the battery pack or a detection device arranged in the battery pack, wherein the detection device is connected to the battery pack and used for detecting each test item of the battery pack and analyzing the obtained detection data to finally obtain the health state of the battery pack.
In the lithium battery health evaluation scheme in the related art, the single battery is usually detected, and detection data is analyzed to obtain the health state of the single battery.
However, if the lithium battery pack needs to be detected and the health state of the lithium battery pack is analyzed, the data amount of the detected data is multiplied along with the increase of the number of the single batteries in the lithium battery pack, so that the data analysis time is long, and the detection efficiency of the health state of the lithium battery pack is low.
In addition, since the battery pack is generally required to be subjected to waterproof and moistureproof treatment, it is difficult to directly detect the related data of the single battery of the lithium battery, and the structure of the battery pack may be damaged by forced detection, so that the lithium battery pack of the electric bicycle is difficult to recover, which is not allowed for the detection of the lithium battery of the electric bicycle.
In view of the above problems, an embodiment of the present invention provides a method for detecting a health status of a battery pack, where a detecting device may be simply connected to the battery pack, for example, the detecting device is connected to a charging/discharging interface of the battery pack, some battery packs need to be connected to a data communication line, and relevant detection data of the battery pack may be obtained by testing test items of the battery pack, such as a total voltage value, an internal resistance value, a discharging overcurrent protection function, an insulation property, a leakage, a charging/discharging interface status, and the like, and then the detection data may be analyzed to obtain the health status of the battery pack.
Specifically, in the embodiment of the invention, the battery pack is used as a unit for detection, the battery pack can comprise at least two single batteries, n test items of the battery pack are detected firstly to obtain detection data of each test item, then the detection score of each test item is generated based on the detection data of each test item, and further the comprehensive detection score of the battery pack is calculated based on the detection score of each test item and the score proportion of each preset test item, and whether the comprehensive detection score is in a preset first range or not is judged, and under the condition that the comprehensive detection score is in the first range, the health state of the battery pack is determined to be normal; if the state of health of the battery pack is not within the first range, it is determined that the state of health of the battery pack is abnormal.
For example, it may be determined whether the integrated detection score is higher than a certain threshold, for example, the threshold is 70 score, if the integrated detection score corresponding to the battery pack is higher than 70 score, the battery pack may be considered to have no potential safety hazard, and the health status of the battery pack may be confirmed and marked as normal;
if the corresponding comprehensive detection score of the battery pack is lower than or equal to 70 points, the battery pack can be considered to have potential safety hazards and possibly dangerous, and the health state of the battery pack can be confirmed and marked as abnormal.
Alternatively, the battery pack may be a lithium battery pack.
Optionally, a cloud-edge cooperative data processing manner may be adopted, specifically, a set of detection data of the battery pack may be transmitted to the cloud end, and the cloud end analyzes and processes the detection data, for example, compares the detection data with a standard data model stored in the cloud end, and finally obtains a health state of the battery pack. By adopting a cloud-edge cooperative data processing mode, the cloud server is matched with the edge equipment, so that the detection of all test items and the analysis of detection data can be completed within 1-2 minutes after the detection is started, and the test result comprising the health state of the battery pack is obtained.
In the method for detecting the health state of the battery pack, the battery pack is used as a unit for detection, so that the data amount of detection data obtained by detection can be effectively reduced compared with that of detection by using a single battery as a unit in the related art, and the health state of the battery pack can be analyzed based on detection data with less data amount, so that the data analysis time is effectively reduced, and the detection efficiency of the health state of the battery pack is improved; in addition, compared with the method of determining the health state of the battery pack by modeling a battery model and the like in the related art, the method and the device of determining the health state of the battery pack based on the detection scores corresponding to the detection data of each test item and the score duty ratio corresponding to the detection scores calculate the comprehensive detection scores of the battery pack, and further determine the health state of the battery pack according to the comprehensive detection scores, so that the determination flow of the health state of the battery pack is effectively simplified, and the detection efficiency of the health state of the battery pack is further improved.
Alternatively, in the case where the integrated detection score is not within the first range, it may be determined whether the detection score of each of the test items is within a second range corresponding to each of the test items set in advance;
and acquiring test items which are not in the second range from the n test items, and displaying the abnormal items on a visual page as the abnormal items of the battery pack.
Specifically, whether the integrated detection score is within the first range may be determined first, and only if the integrated detection score is not within the first range, whether each test item is within the corresponding second range may be compared, and an abnormal item not within the second range may be displayed.
Optionally, the n test items may include at least one of:
1) A charge and discharge interface fault test item;
specifically, a plurality of plugs such as national standard product headers, video headers, aviation headers, cannon headers, direct Current (DC) headers and the like can be arranged on detection equipment applied to the battery pack health state detection method provided by the embodiment of the invention, so that the battery pack health state detection method can be compatible with charging and discharging interfaces of various electric bicycle lithium battery packs;
Optionally, a probe plug may also be reserved on the detection device for use in cases where a common plug cannot be matched.
The embodiment of the invention can detect the voltage of the charge and discharge interface of the lithium battery pack, can select a plug corresponding to the charging seat during testing, and connect the plug into the corresponding charging seat to detect the voltage value of the lithium battery pack of the electric bicycle, and if the detected voltage value is between the maximum voltage and the cut-off voltage of the corresponding lithium battery pack, the charge and discharge interface is judged to be fault-free, and the score of the test item can be set to be 100 at the moment; if the voltage value is detected to be 0, judging that the charge and discharge interface has faults, and setting the score of the test item to be 0.
2) A lithium battery pack total voltage test item;
3) A lithium battery pack internal resistance test item;
4) A lithium battery overcurrent protection function test item;
5) A lithium battery pack insulation resistance test item;
specifically, the embodiment of the invention can measure the insulation resistance between the anode and the cathode of the battery pack and the shell respectively by adopting a bridge method, and determine the resistance of the test resistor according to the voltage of the battery pack of the electric bicycle and the range of the insulation resistance. Through the testing process, the insulation resistance of the lithium battery pack can be detected, whether the insulation resistance of the lithium battery pack is in a normal range or not is judged, and if the insulation resistance is in the normal range, the score of the test item can be set to be 100; if not in the normal range, the insulation resistance is considered to be abnormal, and the score of the test item may be set to 0.
6) And a lithium battery pack leakage test item.
Specifically, the embodiment of the invention detects whether the battery pack leaks or not by utilizing the characteristic that a volatile organic compound (volatile organic compounds, VOC) detection mode is sensitive to volatile gases of organic matters.
If the lithium battery pack has the problem of liquid leakage, the detection equipment can use a specially-made adsorbable gas head through a disc-pasting interface to perform fitting installation on a charging interface and a discharging interface of the lithium battery pack of the electric bicycle, a self-priming pump is started to perform pumping type gas detection on a charging port, gas in a battery shell is pumped out, a sensor for detecting VOC is configured for measurement, if the concentration of the VOC is detected to be in a normal range, the lithium battery pack is considered to have no problem of liquid leakage, and the score of the test item can be set to be 100; if the concentration of the VOCs is detected to be not within the normal range, the lithium battery pack can be considered to have a leakage problem, and the score of the test item can be set to 0.
Optionally, in a case where the n test items include the total voltage test item of the lithium battery pack, the implementation manner of detecting the n test items of the battery pack and obtaining the detection data of each test item may include:
Measuring the current voltage between two lugs of the battery pack and the current electric quantity of the battery pack as the detection data;
the implementation manner of generating the detection score of each test item based on the detection data of each test item may include:
determining whether the current voltage is in a voltage normal range corresponding to the current electric quantity or not based on the current voltage, the current electric quantity and a preset corresponding relation between the voltage normal range and the electric quantity of the battery pack;
under the condition that the current voltage is in the normal range of the voltage corresponding to the current electric quantity, adopting a formula (1) to generate the detection score of the total voltage test item of the lithium battery pack
：
wherein ,
the representation of the preset voltage average value corresponding to the current electric quantity can be obtained through experiments,
the present voltage is characterized in that,
the first parameter factor is characterized.
Specifically, for the detection of the total voltage test item of the lithium battery pack, the relation between the State of Charge (SOC) value of the battery pack and the total voltage of the lithium battery in the standard health State is obtained in advance, the SOC is also referred to as the remaining capacity, and fig. 2 is a schematic diagram of a corresponding curve between the total voltage and the remaining capacity of the lithium battery provided by the present invention, as shown in fig. 2.
The embodiment of the invention measures the current voltage between the two lugs of the lithium battery pack of the electric bicycle, and can be simultaneously used for being in original with the electric bicycleThe electric quantity detection device is communicated with the power supply device, and the normal voltage range (including voltage and threshold value thereof) of different electric quantity stages under the standard health condition is obtained through experiments. Judging whether the current voltage of the lithium battery pack is too high or not according to the measured voltages and the threshold values thereof in different electric quantity stages, and if the current voltage is measured to be in the normal voltage range corresponding to the current electric quantity, generating the detection score of the total voltage test item of the lithium battery pack by adopting a formula (1)
。
If the current voltage is not measured within the normal voltage range corresponding to the current electric quantity, the total voltage of the lithium battery pack can be considered to be abnormal, and the score of the test item can be set to be 0.
Optionally, in a case where the n test items include the lithium battery pack internal resistance test item, the implementation manner of detecting the n test items of the battery pack and obtaining the detection data of each test item may include:
measuring the current internal resistance of the battery pack as the detection data;
the implementation manner of generating the detection score of each test item based on the detection data of each test item may include:
Determining whether the current internal resistance is within a preset normal range of the internal resistance of the battery pack;
under the condition that the current internal resistance is within the normal range of the internal resistance, adopting a formula (2) to generate a detection score of the internal resistance test item of the lithium battery pack
：
wherein ,
characterizing preset internal resistanceThe value of the sum of the values,
characterizing the current internal resistance of the vehicle,
the second parameter factor is characterized.
Specifically, the embodiment of the invention can measure the resistance value of the internal resistance of the lithium battery pack by using the existing internal resistance measurement method, compare the resistance value with the normal range of the internal resistance of the battery pack, for example, compare the resistance value with the threshold value of the normal battery pack measured in a laboratory, judge whether the internal resistance of the lithium battery pack is normal or abnormal, and if the measured internal resistance of the lithium battery pack is within the normal range of the internal resistance, generate the detection score of the internal resistance test item of the lithium battery pack by adopting the formula (2)
。
If the measured internal resistance of the lithium battery pack is not within the internal resistance normal range, the internal resistance of the lithium battery pack can be considered to be abnormal, and the score of the test item can be set to 0.
Optionally, in the case that the n test items include the lithium battery pack overcurrent protection function test item, the implementation manner of detecting the n test items of the battery pack and obtaining the detection data of each test item may include:
Controlling the battery pack to discharge at a first current in a discharge loop of the battery pack; wherein the first current is greater than a maximum allowable discharge current of the battery pack;
detecting a second current in the discharge loop;
acquiring the overcurrent time of the second current in a preset current normal range of the battery pack as the detection data;
the implementation manner of generating the detection score of each test item based on the detection data of each test item may include:
based on the overcurrent time, generating the lithium battery pack overcurrent by adopting a formula (3)Detection score for stream protection function test item
：
wherein ,
characterizing the flow time.
Specifically, the embodiment of the invention can test the overcurrent protection function of the lithium battery pack in a resistance discharge mode, and the first discharge current can be 1.2 times of the maximum allowable discharge current. And a Hall sensor with proper measuring range is additionally arranged in a discharging loop of the battery pack, and a second current in the discharging loop is monitored to judge whether the discharging protection function of the lithium battery pack is normal or not.
The total voltage and the second current of the battery pack can be detected before and during the discharging process, and whether the discharging overcurrent protection function of the battery pack is normal or not can be judged by monitoring the magnitude relation between the second current and the first current.
In consideration of safety problems during high-current discharge, the discharge time of the battery pack may be set to not more than 10 seconds, and may be set according to the overcurrent time
Generating a detection score of the overcurrent protection function test item of the lithium battery pack by adopting a formula (3)
Through the test, the normal or abnormal overcurrent protection function of the lithium battery pack can be judged.
Optionally, the implementation manner of calculating the comprehensive detection score of the battery pack based on the detection score of each test item and the preset score duty ratio of each test item may include:
based on each ofDetection score of the test item
And the fraction ratio of each preset test item
Calculating the comprehensive detection score of the battery pack by adopting a formula (4)
：
wherein ,
characterizing the nth test item of the n test items
And test items.
Specifically, the composite detection score is used to characterize the composite evaluation of the tested lithium battery pack, and may be based on the detection scores of the test items
And the fraction ratio of each test item preset
Calculating the comprehensive detection score of the battery pack by adopting the formula (4)
。
For example, if the integrated detection score is less than 70, it may be determined that the current battery pack has a safety hazard, and the battery pack is marked as abnormal. Meanwhile, abnormal items can be prompted.
The following illustrates a method for detecting a health state of a battery pack according to an embodiment of the present invention.
Fig. 3 is a second flowchart of the method for detecting the health status of a battery pack according to the present invention, as shown in fig. 3, the method includes steps 301 to 307; wherein:
Specifically, after the detection device is connected with the lithium battery pack, fault detection of the charge/discharge interface can be performed first; detecting the total voltage of the lithium battery pack, and performing data analysis, for example, comparing the detected data with a standard value; then measuring the internal resistance value of the lithium battery pack, and performing data analysis, such as comparing the detection data with a standard value; discharging the lithium battery pack with 1.2 times of rated current, and detecting whether the overcurrent protection is normal or not; measuring the insulativity of the lithium battery pack, specifically detecting the insulation resistance of the lithium battery pack, and performing data analysis, such as comparing the detection data with a standard value; detecting whether leakage exists in the lithium battery pack; and finally, obtaining comprehensive detection scores as final detection results according to the detection data obtained by the detection items.
Optionally, the embodiment of the invention provides a safety and rapid detection device for the lithium battery pack of the electric vehicle aiming at the safety problem of the lithium battery pack of the electric vehicle, and the device can give a detection result representing the health state of the battery pack within one minute by obtaining detection data such as the total voltage of the battery pack, the internal resistance value of the battery pack, the overcurrent protection function of the battery pack, the insulation state of the battery pack, the leakage condition of the battery pack, the charge and discharge interface state of the battery pack and the like, thereby solving the problems of more test items, complex operation and long detection time consumption in the prior art.
In the embodiment of the invention, the following beneficial effects exist:
1) The lithium battery pack is detected, so that test data are simplified, the situation that single batteries cannot be directly measured can be avoided, the battery pack is prevented from being damaged due to the fact that the battery pack is disassembled, and good compatibility is achieved;
2) The cloud edge cooperation scheme can be adopted, and all test items can be completed within 1-2 minutes by matching the cloud server with the edge equipment, so that the health state of the battery pack is determined;
3) The charging and discharging interfaces of most lithium battery packs of the electric vehicle can be compatible;
4) Related prompts and suggestions can be given according to the detection data of each test item;
5) The detection device can be a portable device, and can detect the health state of the lithium battery pack at any place.
The following describes the device for detecting the health state of the battery pack, and the device for detecting the health state of the battery pack and the method for detecting the health state of the battery pack described below can be referred to correspondingly.
Fig. 4 is a schematic structural diagram of a device for detecting a health state of a battery pack according to the present invention, and as shown in fig. 4, a device 400 for detecting a health state of a battery pack includes:
the detection module 401 is configured to detect n test items of the battery pack, and obtain detection data of each test item; wherein n is an integer greater than 1, and the battery pack comprises at least two single batteries;
a generating module 402, configured to generate a detection score of each test item based on detection data of each test item;
a calculating module 403, configured to calculate a comprehensive detection score of the battery pack based on the detection score of each test item and a preset score duty ratio of each test item;
a determining module 404, configured to determine that the health status of the battery pack is normal if the integrated detection score is within a first range set in advance; and determining that the health state of the battery pack is abnormal in the case that the integrated detection score is not within the first range.
In the method for detecting the health state of the battery pack, the battery pack is used as a unit for detection, so that the data amount of detection data obtained by detection can be effectively reduced compared with that of detection by using a single battery as a unit in the related art, and the health state of the battery pack can be analyzed based on detection data with less data amount, so that the data analysis time is effectively reduced, and the detection efficiency of the health state of the battery pack is improved; in addition, compared with the method of determining the health state of the battery pack by modeling a battery model and the like in the related art, the method and the device of determining the health state of the battery pack based on the detection scores corresponding to the detection data of each test item and the score duty ratio corresponding to the detection scores calculate the comprehensive detection scores of the battery pack, and further determine the health state of the battery pack according to the comprehensive detection scores, so that the determination flow of the health state of the battery pack is effectively simplified, and the detection efficiency of the health state of the battery pack is further improved.
Optionally, the detection module 401 is further configured to:
judging whether the detection score of each test item is in a preset second range corresponding to each test item under the condition that the comprehensive detection score is not in the first range;
And acquiring test items which are not in the second range from the n test items, and displaying the abnormal items on a visual page as the abnormal items of the battery pack.
Optionally, the n test items may include at least one of:
1) A charge and discharge interface fault test item;
2) A lithium battery pack total voltage test item;
3) A lithium battery pack internal resistance test item;
4) A lithium battery overcurrent protection function test item;
5) A lithium battery pack insulation resistance test item;
6) And a lithium battery pack leakage test item.
Optionally, in the case that the n test items include the lithium battery pack total voltage test item, the detection module 401 is specifically configured to: measuring the current voltage between two lugs of the battery pack and the current electric quantity of the battery pack as the detection data;
the generating module 402 is specifically configured to:
determining whether the current voltage is in a voltage normal range corresponding to the current electric quantity or not based on the current voltage, the current electric quantity and a preset corresponding relation between the voltage normal range and the electric quantity of the battery pack;
under the condition that the current voltage is in the normal range of the voltage corresponding to the current electric quantity, adopting a formula (1) to generate the detection score of the total voltage test item of the lithium battery pack 
：
wherein ,
representing a preset voltage average value corresponding to the current electric quantity,
the present voltage is characterized in that,
the first parameter factor is characterized.
Optionally, in the case that the n test items include the lithium battery pack internal resistance test item, the detection module 401 is specifically configured to: measuring the current internal resistance of the battery pack as the detection data;
the generating module 402 is specifically configured to:
determining whether the current internal resistance is within a preset normal range of the internal resistance of the battery pack;
under the condition that the current internal resistance is within the normal range of the internal resistance, adopting a formula (2) to generate a detection score of the internal resistance test item of the lithium battery pack
：
wherein ,
representing a preset internal resistance average value,
characterizing the current internal resistance of the vehicle,
the second parameter factor is characterized.
Optionally, in the case that the n test items include the lithium battery pack overcurrent protection function test item, the detection module 401 is specifically configured to:
controlling the battery pack to discharge at a first current in a discharge loop of the battery pack; wherein the first current is greater than a maximum allowable discharge current of the battery pack;
detecting a second current in the discharge loop;
acquiring the overcurrent time of the second current in a preset current normal range of the battery pack as the detection data;
The generating module 402 is specifically configured to: generating the lithium battery pack overcurrent protection by adopting a formula (3) based on the overcurrent timeDetection score of functional test item
：
wherein ,
characterizing the flow time.
Optionally, the computing module 403 is specifically configured to:
detection score based on each of the test items
And the fraction ratio of each preset test item
Calculating the comprehensive detection score of the battery pack by adopting a formula (4)
：
wherein ,
characterizing the nth test item of the n test items
And test items.
Fig. 5 is a schematic structural diagram of an electronic device according to the present invention, and as shown in fig. 5, the electronic device may include: processor 510, communication interface (Communications Interface) 520, memory 530, and communication bus 540, wherein processor 510, communication interface 520, memory 530 complete communication with each other through communication bus 540. Processor 510 may invoke logic instructions in memory 530 to perform a method of detecting a battery state of health, the method comprising: detecting n test items of the battery pack to obtain detection data of each test item; wherein n is an integer greater than 1, and the battery pack comprises at least two single batteries;
Generating a detection score for each test item based on the detection data for each test item;
calculating the comprehensive detection score of the battery pack based on the detection score of each test item and the preset score duty ratio of each test item;
determining that the health state of the battery pack is normal under the condition that the comprehensive detection score is in a preset first range;
and determining that the health state of the battery pack is abnormal in the case that the integrated detection score is not within the first range.
Further, the logic instructions in the memory 530 described above may be implemented in the form of software functional units and may be stored in a computer-readable storage medium when sold or used as a stand-alone product. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In another aspect, the present invention also provides a computer program product, the computer program product including a computer program, the computer program being storable on a non-transitory computer readable storage medium, the computer program, when executed by a processor, being capable of executing the method for detecting the health status of a battery pack provided by the methods described above, the method comprising: detecting n test items of the battery pack to obtain detection data of each test item; wherein n is an integer greater than 1, and the battery pack comprises at least two single batteries;
generating a detection score for each test item based on the detection data for each test item;
calculating the comprehensive detection score of the battery pack based on the detection score of each test item and the preset score duty ratio of each test item;
determining that the health state of the battery pack is normal under the condition that the comprehensive detection score is in a preset first range;
and determining that the health state of the battery pack is abnormal in the case that the integrated detection score is not within the first range.
In yet another aspect, the present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, is implemented to perform a method for detecting a health state of a battery pack provided by the above methods, the method comprising: detecting n test items of the battery pack to obtain detection data of each test item; wherein n is an integer greater than 1, and the battery pack comprises at least two single batteries;
Generating a detection score for each test item based on the detection data for each test item;
calculating the comprehensive detection score of the battery pack based on the detection score of each test item and the preset score duty ratio of each test item;
determining that the health state of the battery pack is normal under the condition that the comprehensive detection score is in a preset first range;
and determining that the health state of the battery pack is abnormal in the case that the integrated detection score is not within the first range.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A method for detecting a state of health of a battery pack, comprising:
detecting n test items of the battery pack to obtain detection data of each test item; wherein n is an integer greater than 1, and the battery pack comprises at least two single batteries;
generating a detection score for each test item based on the detection data for each test item;
calculating the comprehensive detection score of the battery pack based on the detection score of each test item and the preset score duty ratio of each test item;
determining that the health state of the battery pack is normal under the condition that the comprehensive detection score is in a preset first range;
Determining that the state of health of the battery pack is abnormal if the integrated detection score is not within the first range;
in the case that the n test items include a total voltage test item of the lithium battery pack, the detecting n test items of the battery pack, obtaining detection data of each test item, includes:
measuring the current voltage between two lugs of the battery pack and the current electric quantity of the battery pack as the detection data;
the generating the detection score of each test item based on the detection data of each test item includes:
determining whether the current voltage is in a voltage normal range corresponding to the current electric quantity or not based on the current voltage, the current electric quantity and a preset corresponding relation between the voltage normal range and the electric quantity of the battery pack;
under the condition that the current voltage is in the normal range of the voltage corresponding to the current electric quantity, adopting a formula (1) to generate the detection score of the total voltage test item of the lithium battery pack
：
wherein ,
characterizing a preset voltage mean value corresponding to the current electric quantity, < >>
The present voltage is characterized in that,
the first parameter factor is characterized.
2. The method of detecting a state of health of a battery pack according to claim 1, further comprising:
Judging whether the detection score of each test item is in a preset second range corresponding to each test item under the condition that the comprehensive detection score is not in the first range;
and acquiring test items which are not in the second range from the n test items, and displaying the abnormal items on a visual page as the abnormal items of the battery pack.
3. The method of claim 1, wherein the n test items include at least one of:
a charge and discharge interface fault test item;
a lithium battery pack total voltage test item;
a lithium battery pack internal resistance test item;
a lithium battery overcurrent protection function test item;
a lithium battery pack insulation resistance test item;
and a lithium battery pack leakage test item.
4. The method according to claim 3, wherein in the case where the n test items include the lithium battery internal resistance test item, the detecting n test items of the battery, obtaining detection data of each of the test items, comprises:
measuring the current internal resistance of the battery pack as the detection data;
the generating the detection score of each test item based on the detection data of each test item includes:
Determining whether the current internal resistance is within a preset normal range of the internal resistance of the battery pack;
under the condition that the current internal resistance is within the normal range of the internal resistance, adopting a formula (2) to generate a detection score of the internal resistance test item of the lithium battery pack
：
wherein ,
characterizing a preset internal resistance mean value->
Characterizing the current internal resistance,/->
The second parameter factor is characterized.
5. The method according to claim 3, wherein, in the case where the n test items include the lithium battery pack overcurrent protection function test item, the detecting n test items of the battery pack, obtains detection data of each of the test items, includes:
controlling the battery pack to discharge at a first current in a discharge loop of the battery pack; wherein the first current is greater than a maximum allowable discharge current of the battery pack;
detecting a second current in the discharge loop;
acquiring the overcurrent time of the second current in a preset current normal range of the battery pack as the detection data;
the generating the detection score of each test item based on the detection data of each test item includes:
Based on the overcurrent time, generating a detection score of the lithium battery pack overcurrent protection function test item by adopting a formula (3)
：
wherein ,
characterizing the flow time.
6. The method for detecting a health state of a battery pack according to claim 3, wherein the calculating the integrated detection score of the battery pack based on the detection score of each test item and a preset score ratio of each test item comprises:
detection score based on each of the test items
And the score of each of the test items is preset to be +.>
Calculating a comprehensive detection score of the battery pack using formula (4)>
：
wherein ,
characterizing a first test item of the n test items.
7. A battery pack state of health detection apparatus, comprising:
the detection module is used for detecting n test items of the battery pack and obtaining detection data of each test item; wherein n is an integer greater than 1, and the battery pack comprises at least two single batteries;
the generation module is used for generating detection scores of the test items based on the detection data of the test items;
the calculation module is used for calculating the comprehensive detection score of the battery pack based on the detection score of each test item and the preset score duty ratio of each test item;
A determining module, configured to determine that the health status of the battery pack is normal if the integrated detection score is within a preset first range; determining that the state of health of the battery pack is abnormal if the integrated detection score is not within the first range;
wherein, the detection module is specifically used for: measuring the current voltage between two lugs of the battery pack and the current electric quantity of the battery pack as the detection data under the condition that the n test items comprise a total voltage test item of the lithium battery pack;
the generating module is specifically configured to:
determining whether the current voltage is in a voltage normal range corresponding to the current electric quantity or not based on the current voltage, the current electric quantity and a preset corresponding relation between the voltage normal range and the electric quantity of the battery pack;
under the condition that the current voltage is in the normal range of the voltage corresponding to the current electric quantity, adopting a formula (1) to generate the detection score of the total voltage test item of the lithium battery pack
：
wherein ,
characterizing a preset voltage mean value corresponding to the current electric quantity, < >>
The present voltage is characterized in that,
the first parameter factor is characterized.
8. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of detecting the state of health of a battery as claimed in any one of claims 1 to 6 when executing the program.
9. A non-transitory computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when executed by a processor, implements a method of detecting the state of health of a battery pack according to any one of claims 1 to 6.
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