CN113655390B - Analysis method for differential pressure fault of battery system - Google Patents
Analysis method for differential pressure fault of battery system Download PDFInfo
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- CN113655390B CN113655390B CN202110907380.7A CN202110907380A CN113655390B CN 113655390 B CN113655390 B CN 113655390B CN 202110907380 A CN202110907380 A CN 202110907380A CN 113655390 B CN113655390 B CN 113655390B
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- 238000004458 analytical method Methods 0.000 title claims abstract description 24
- 238000012360 testing method Methods 0.000 claims abstract description 22
- 238000007599 discharging Methods 0.000 claims abstract description 14
- 230000008859 change Effects 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 17
- 230000008569 process Effects 0.000 abstract description 9
- 238000011161 development Methods 0.000 abstract description 5
- 230000002159 abnormal effect Effects 0.000 description 12
- 230000000284 resting effect Effects 0.000 description 4
- 230000005856 abnormality Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
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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]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Engineering & Computer Science (AREA)
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- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides an analysis method for a differential pressure fault of a battery system, which comprises the following steps: detecting the battery to be detected, checking whether leakage current occurs, if so, recording the leakage current as a fault battery, and if not, recording the leakage current as a normal battery; alternately carrying out a shelving test and a charging and discharging test on the battery to be tested, wherein the shelving test does not exceed the voltage platform period of the battery, and respectively calculating the leakage current values of a normal battery and a fault battery; and comparing the leakage current values of the normal battery and the fault battery so as to analyze the cause of the voltage difference fault of the battery system. According to the invention, through analysis of the differential pressure fault of the battery system, whether the under-voltage fault of the battery in the use process is the cause of insufficient discharge capacity or not can be accurately positioned, if not, the problem point of the fault sample package is accurately positioned through test analysis, and corresponding guidance opinion is provided for front-end development.
Description
Technical Field
The invention belongs to the technical field of batteries, relates to analysis of battery pressure difference faults, and particularly relates to an analysis method for battery system pressure difference faults.
Background
The lithium battery cells need to be connected in series in the process of combining the battery cells, a battery with good quality requires good consistency of parameters among the single battery cells, but ideal consistency does not exist, the parameters of the battery cells connected in series can change (finally embodied in a voltage change form) in the process of continuously charging and discharging, and meanwhile, the battery enters a vicious circle, so that the battery can be accelerated to fail in advance.
CN111562503a discloses an analysis processing method for failure of lithium ion battery charging and discharging equipment, comprising the following steps: firstly, carrying out preset charging and discharging operations on a lithium ion battery correspondingly by adopting a charging and discharging channel of battery charging and discharging equipment, judging whether the battery has a charging and discharging failure problem according to preset classification judgment standards, and distinguishing the battery charging and discharging equipment into four factors, namely a channel fault factor, an OCV detection equipment factor, an environmental factor and a battery factor; and secondly, dividing the battery with the channel faults of the battery charging and discharging equipment into a plurality of preset channel abnormal categories according to the charging and discharging data and preset channel fault abnormal classification standards. The invention can judge whether the reasons for not doing the battery charge and discharge are caused by the reasons for the faults of the battery charge and discharge equipment, and can judge the specific type and the fault part of the faults of the battery charge and discharge equipment, thereby ensuring the effective maintenance of the battery charge and discharge equipment.
CN108375737a discloses a diagnosis method for single cell voltage acquisition faults of a battery pack, which comprises the following steps: 1) Monitoring and recording the voltage difference values of two ends of all the single cell acquisition lines, and calculating the instantaneous pressure difference change rate; 2) Judging whether the voltage difference exceeds a limit value, and checking the pressure difference change rate before and after the moment when the voltage difference exceeds the limit value; 3) Judging whether the change rate of the differential pressure exceeds a limit value, if so, checking whether two cells with large differential pressure are adjacent; 4) If the voltage average value is close to the voltage average value of all the electric cores, the problem of acquisition lines between the two electric cores is solved, and the voltage average value of the two electric cores is used for replacing an error value; 5) If not, checking whether the voltages of the adjacent cells are abnormal, if so, taking the adjacent cells as a group, and returning to the step 2). The invention can more accurately determine the problem of large voltage difference of the battery pack monomer caused by the acquisition line, and avoid the damage of voltage equalization triggered by error caused by the problem of large voltage difference to the battery pack.
CN109065987a discloses a method and system for balancing cell voltages, the method comprising: detecting the voltage of each electric core in the battery through a suspension technology; acquiring abnormal battery cells with adjacent voltage differences larger than a preset voltage difference threshold value from each battery cell; and continuously low-power balance adjustment is carried out on the abnormal battery cells. According to the embodiment of the invention, the voltage difference threshold value is preset, when the adjacent voltage difference is larger than the preset voltage difference threshold value, continuous low-power balance adjustment is carried out on the abnormal battery cell, and the method for balancing the voltage of the battery cell is provided, so that when the voltage difference of the adjacent battery cell exceeds the threshold value, the balance adjustment is carried out, and the adjustment is not carried out only when the battery cell exceeds a safety range, so that the service life of the battery is ensured.
At present, when the discharge capacity is insufficient due to the undervoltage problem in the use process due to the battery pressure difference problem on the market, whether the battery management system is balanced and abnormally started, electric leakage caused by poor insertion of a wire harness and the like can possibly cause undervoltage caused by the electric leakage phenomenon of a certain string in the use process of the battery pack, and a method capable of quantitatively testing the self-discharge is needed to determine whether the battery is caused by the self-discharge of the battery core.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide an analysis method for the differential pressure fault of the battery system, in the invention, through the analysis of the differential pressure fault of the battery system, whether the under-voltage fault of the battery in the use process is the cause of insufficient discharge capacity can be accurately positioned, if not, the problem point of the fault sample package is accurately positioned through test analysis, and corresponding guidance opinion is provided for front-end development.
To achieve the purpose, the invention adopts the following technical scheme:
the invention provides an analysis method for a differential pressure fault of a battery system, which comprises the following steps:
detecting a battery to be detected, checking whether leakage current occurs, if so, recording the leakage current as a fault battery, and if not, recording the leakage current as a normal battery;
(II) alternately carrying out a shelving test and a charging and discharging test on the battery to be tested, wherein the shelving test does not exceed the voltage platform period of the battery, and respectively calculating the leakage current values of the normal battery and the fault battery;
and (III) comparing the leakage current values of the normal battery and the fault battery so as to analyze the cause of the voltage difference fault of the battery system.
It should be noted that the present invention does not specifically require or limit the size, shape, and model of the battery, and the battery has the function of providing the test element and the condition in the present invention, so it is understood that other batteries capable of implementing such functions may be used in the present invention, and those skilled in the art may adapt the size, shape, and model of the battery according to the usage scenario and the test condition.
According to the invention, through analysis of the differential pressure fault of the battery system, whether the under-voltage fault of the battery in the use process is the cause of insufficient discharge capacity or not can be accurately positioned, if not, the problem point of the fault sample package is accurately positioned through test analysis, and corresponding guidance opinion is provided for front-end development.
As a preferred embodiment of the present invention, in the step (ii), the leakage current value is calculated according to the following formula 1:
I 1 ＝A 0 t1;
wherein T is the time from the completion of production to the occurrence of failure of the battery, A 0 I for lost capacity 1 Is the leakage current value.
In the step (II), the normal battery and the fault battery are firstly discharged to the voltage of 2.0V by 1A, then are put aside, the normal battery and the fault battery are charged to 15% SOC by the current of 1A, and the actual charge capacity is respectively recorded as A 1 normal And A 1 failure of 。
In the step (ii), after the normal battery and the fault battery are charged to 15% soc, the normal battery and the fault battery are left for D days, and the voltage change is monitored in real time.
In a preferred embodiment of the present invention, in the step (II), the resting temperature is 25 to 35℃and may be, for example, 25℃26℃27℃28℃29℃30℃31℃32℃33℃34℃35℃but not limited to the values listed, and other values not listed in the range are equally applicable.
As a first aspect of the inventionIn the preferred technical scheme, in the step (II), after the normal battery and the fault battery are placed for D days, the normal battery and the fault battery are respectively emptied to 2.0V by 1A current, and the discharge capacity is respectively marked as A 2 normal state And A 2 failure of The voltage plateau period of the battery is 10 to 15 days, and may be, for example, 10 days, 10.5 days, 11 days, 11.5 days, 12 days, 12.5 days, 13 days, 13.5 days, 14 days, 14.5 days, or 15 days, but the present invention is not limited to the above-mentioned values, and other values not shown in the above-mentioned values are applicable.
As a preferable technical scheme of the invention, the end of the step (II), the leakage current values of the normal battery and the fault battery are respectively recorded as I 2 normal state And I 2 failure of Calculated according to the following formulas 2 and 3:
I 2 normal state ＝(A 2 normal state -A 1 normal ) D2;
I 2 failure of ＝(A 2 failure of -A 1 failure of ) and/D3.
As a preferable technical scheme of the invention, when the I is that 2 failure of ＞I 1 And when the battery cell self-discharge abnormality is judged to cause the undervoltage of the battery pack.
As a preferable technical scheme of the invention, when the I is that 2 failure of ＜I 1 And I 2 failure of ≤I 2 normal state And when the battery pack is under-voltage caused by self-discharge of the non-battery cell, the leakage problem at the system end needs to be checked.
As a preferable technical scheme of the invention, when the I is that 2 failure of ＜I 1 But I 2 failure of ＞I 2 normal state When the battery cell is judged to have self-discharge abnormal phenomenon, the abnormal electric leakage problem at the system end needs to be checked.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, through analysis of the differential pressure fault of the battery system, whether the under-voltage fault of the battery in the use process is the cause of insufficient discharge capacity or not can be accurately positioned, if not, the problem point of the fault sample package is accurately positioned through test analysis, and corresponding guidance opinion is provided for front-end development.
Drawings
Fig. 1 is a schematic diagram illustrating steps of an analysis method for a differential pressure failure of a battery system according to an embodiment of the present invention.
Detailed Description
The technical scheme of the invention is further described by the following specific embodiments.
In one embodiment, the present invention provides an analysis method for a differential pressure fault of a battery system, where the analysis method is shown in fig. 1, and includes:
detecting a battery to be detected, checking whether leakage current occurs, if so, recording the leakage current as a fault battery, and if not, recording the leakage current as a normal battery;
(II) alternately carrying out a shelving test and a charging and discharging test on the battery to be tested, wherein the shelving test does not exceed the voltage platform period of the battery, and respectively calculating the leakage current values of the normal battery and the fault battery;
and (III) comparing the leakage current values of the normal battery and the fault battery so as to analyze the cause of the voltage difference fault of the battery system.
The invention has no specific requirements and special limitations on the characteristics of the size, shape, model and the like of the battery, and the battery has the function of providing test elements and conditions in the invention, so that it is understood that other batteries capable of realizing the functions can be used in the invention, and the size, shape and model of the battery can be adaptively adjusted according to the use scene and the test conditions by a person skilled in the art.
According to the invention, through analysis of the differential pressure fault of the battery system, whether the under-voltage fault of the battery in the use process is the cause of insufficient discharge capacity or not can be accurately positioned, if not, the problem point of the fault sample package is accurately positioned through test analysis, and corresponding guidance opinion is provided for front-end development.
In the step (II), the leakage current value is calculated according to the following formula 1:
I 1 ＝A 0 t1;
wherein T is the time from the completion of production to the occurrence of failure of the battery, A 0 I for lost capacity 1 Is the leakage current value.
In the step (II), the normal battery and the fault battery are firstly discharged to the voltage of 2.0V by 1A, then are put aside, the normal battery and the fault battery are charged to 15% SOC by the current of 1A, and the actual charging capacity is respectively recorded as A 1 normal And A 1 failure of 。
In the step (II), after the normal battery and the fault battery are charged to 15% of SOC, the normal battery and the fault battery are placed on the shelf for D days, and the voltage change is monitored in real time.
In the step (II), the resting temperature is 25 to 35℃and may be, for example, 25℃and 26℃and 27℃and 28℃and 29℃and 30℃and 31℃and 32℃and 33℃and 34℃and 35℃respectively, but the resting temperature is not limited to the values listed, and other values not listed in the range are applicable.
In the step (II), after the normal battery and the fault battery are placed for D days, the normal battery and the fault battery are respectively emptied to 2.0V by using 1A current, and the discharge capacity is respectively recorded as A 2 normal state And A 2 failure of The voltage plateau period of the battery is 10 to 15 days, and may be, for example, 10 days, 10.5 days, 11 days, 11.5 days, 12 days, 12.5 days, 13 days, 13.5 days, 14 days, 14.5 days, or 15 days, but the present invention is not limited to the above-mentioned values, and other values not shown in the above-mentioned values are applicable.
At the end of step (II), the leakage current values of the normal battery and the fault battery are respectively recorded as I 2 normal state And I 2 failure of Calculated according to the following formulas 2 and 3:
I 2 normal state ＝(A 2 normal state -A 1 normal ) D2;
I 2 failure of ＝(A 2 failure of -A 1 failure of ) and/D3.
When said I 2 failure of ＞I 1 And when the battery cell self-discharge abnormality is judged to cause the undervoltage of the battery pack.
When saidI of (2) 2 failure of ＜I 1 And I 2 failure of ≤I 2 normal state And when the battery pack is under-voltage caused by self-discharge of the non-battery cell, the leakage problem at the system end needs to be checked.
When said I 2 failure of ＜I 1 But I 2 failure of ＞I 2 normal state When the battery cell is judged to have self-discharge abnormal phenomenon, the abnormal electric leakage problem at the system end needs to be checked.
Example 1
Based on a specific implementation manner, the embodiment provides an analysis method for a differential pressure fault of a battery system, wherein:
detecting the battery to be detected, checking whether leakage current occurs, if so, recording the leakage current as a fault battery, and if not, recording the leakage current as a normal battery;
the leakage current value is calculated according to the following formula 1:
I 1 ＝A 0 t1;
wherein T is the time from the completion of production to the occurrence of failure of the battery, A 0 I for lost capacity 1 Is the leakage current value.
Firstly, discharging a normal battery and a fault battery to a voltage of 2.0V at 1A, then placing the normal battery and the fault battery, charging the normal battery and the fault battery to 15% SOC at a current of 1A, and recording actual charging capacities as A respectively 1 normal And A 1 failure of 。
And secondly, placing the normal battery and the fault battery for 15 days, and monitoring the voltage change in real time. Wherein the resting temperature is 30 ℃.
Finally, the normal battery and the fault battery are respectively emptied to 2.0V by using 1A current, and the discharge capacity is respectively recorded as A 2 normal state And A 2 failure of The leakage current values of the normal battery and the fault battery are respectively recorded as I 2 normal state And I 2 failure of Calculated according to the following formulas 2 and 3:
I 2 normal state ＝(A 2 normal state -A 1 normal ) 15 formula 2;
I 2 failure of ＝(A 2 failure of -A 1 failure of ) And/15 formula 3.
When I 2 failure of ＞I 1 And when the battery cell self-discharge abnormality is judged to cause the undervoltage of the battery pack.
When I 2 failure of ＜I 1 And I 2 failure of ≤I 2 normal state And when the battery pack is under-voltage caused by self-discharge of the non-battery cell, the leakage problem at the system end needs to be checked.
When I 2 failure of ＜I 1 But I 2 failure of ＞I 2 normal state When the battery cell is judged to have self-discharge abnormal phenomenon, the abnormal electric leakage problem at the system end needs to be checked.
While the foregoing is directed to embodiments of the present invention, other and further details of the invention may be had by the present invention, it should be understood that the foregoing description is merely illustrative of the present invention and that no limitations are intended to the scope of the invention, except insofar as modifications, equivalents, improvements or modifications are within the spirit and principles of the invention.
The applicant states that the detailed method of the present invention is illustrated by the above examples, but the present invention is not limited to the detailed method described above, i.e. it does not mean that the present invention must be practiced in dependence upon the detailed method described above. It should be apparent to those skilled in the art that any modification of the present invention, equivalent substitution of raw materials for the product of the present invention, addition of auxiliary components, selection of specific modes, etc., falls within the scope of the present invention and the scope of disclosure.
Claims (1)
1. An analysis method for a differential pressure fault of a battery system, the analysis method comprising:
detecting a battery to be detected, checking whether leakage current occurs, if so, recording the leakage current as a fault battery, and if not, recording the leakage current as a normal battery;
(II) alternately carrying out a shelving test and a charging and discharging test on the battery to be tested, wherein the shelving test does not exceed the voltage platform period of the battery, and respectively calculating the leakage current values of the normal battery and the fault battery;
(iii) comparing leakage current values of the normal battery and the failed battery to analyze a cause of a voltage difference failure of the battery system;
in the step (ii), the leakage current value is calculated according to the following formula 1:
I 1 ＝A 0 t1;
wherein T is the time from the completion of production to the occurrence of failure of the battery, A 0 I for lost capacity 1 Is the leakage current value;
in the step (II), the normal battery and the fault battery are firstly discharged to the voltage of 2.0V by 1A, then are put aside, the normal battery and the fault battery are charged to 15% SOC by the current of 1A, and the actual charge capacity is respectively recorded as A 1 normal And A 1 failure of ；
In the step (II), after the normal battery and the fault battery are charged to 15% of SOC, the normal battery and the fault battery are placed for D days, and the voltage change is monitored in real time; after the normal battery and the fault battery are placed for D days, the normal battery and the fault battery are respectively emptied to 2.0V by 1A current, and the discharge capacity is respectively recorded as A 2 normal state And A 2 failure of Wherein D is the voltage plateau of the battery, and the range is 10-15 days;
ending the step (II), wherein the leakage current values of the normal battery and the fault battery are respectively recorded as I 2 normal state And I 2 failure of Calculated according to the following formulas 2 and 3:
I 2 normal state ＝(A 2 normal state -A 1 normal ) D2;
I 2 failure of ＝(A 2 failure of -A 1 failure of ) and/D3.
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| 钱强.新能源汽车动力电池压差故障与维修技术研究.电子测试.2020,(第5期),139-140,18. * |
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