CN112068007B - Method for detecting consistency of battery pole group - Google Patents
Method for detecting consistency of battery pole group Download PDFInfo
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- CN112068007B CN112068007B CN202010755283.6A CN202010755283A CN112068007B CN 112068007 B CN112068007 B CN 112068007B CN 202010755283 A CN202010755283 A CN 202010755283A CN 112068007 B CN112068007 B CN 112068007B
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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]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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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
- 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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Abstract
The invention discloses a method for detecting consistency of battery pole groups, which comprises the following steps: the method comprises the steps of firstly, continuously charging a plurality of battery pole groups to be detected, and recording full charge time tx required by full charge to a preset charging voltage Vx and voltage drop DeltaV after full charge to the preset charging voltage Vx and keeping a preset charging time tz in real time; secondly, screening out isolated full-charge time distribution points and calculating an offset A by taking full-charge time tx of each battery pole group as a research object; taking the voltage drop delta V of each battery pole group to be detected as a research object, screening out isolated voltage drop distribution points, and calculating the offset B of the isolated voltage drop distribution points; and thirdly, judging whether the battery pole group corresponding to the isolated full-power time distribution point and the isolated voltage drop distribution point is a consistency difference pole group or not according to the offset A and the offset B. The invention can screen the consistency of the battery pole group, and achieves the aim of pre-screening the consistency of the battery.
Description
Technical Field
The invention relates to the technical field of battery detection, in particular to a method for detecting consistency of battery pole groups.
Background
Currently, batteries are becoming more and more interesting as a main object of new kinetic energy provision. It is well known that battery consistency is a key element limiting battery PACK (PACK) life and also a key limiting cost reduction for many battery enterprises, and the focus of solving this problem is: the consistency of the internal components of the battery is strictly controlled.
Among the numerous internal structures of the battery, the consistency of the pole group as the primary site of the electrochemical reaction is particularly important. However, the consistency of the electrode group is only limited to macroscopic measurement at present, and the influence caused by microscopic change of the electrode group cannot be comprehensively detected, such as the influence of active material quality, hardness after hot pressing of the electrode group, micro short circuit and the like, so that the consistency of the electrode group cannot be accurately screened, and the purpose of screening the consistency of the battery in advance cannot be achieved.
Disclosure of Invention
The invention aims at providing a method for detecting consistency of a battery pole group aiming at the technical defects existing in the prior art.
Therefore, the invention provides a method for detecting the consistency of a battery pole group, which comprises the following steps:
firstly, applying a preset charging voltage Vx to a plurality of battery pole groups to be detected by using a test charging device, continuously charging the battery pole groups within a preset charging time period tz, and recording full-charge time tx required by each battery pole group to be detected to be fully charged to the preset charging voltage Vx and voltage drop DeltaV after the battery pole groups to be detected are fully charged to the preset charging voltage Vx and the preset charging time period tz is maintained in real time;
secondly, taking the full-charge time tx of each battery pole group to be detected as a research object, carrying out distribution analysis, drawing to obtain a first distribution diagram, screening out isolated full-charge time distribution points from the first distribution diagram, wherein the isolated full-charge time distribution points are points larger than a preset time value, and calculating the offset A of the isolated full-charge time distribution points according to the time value X of the isolated full-charge time distribution points;
the preset time value is equal to the average value of the full power time tx of all the plurality of battery pole groups to be detected, and the average value floats by a preset proportion;
meanwhile, taking the voltage drop delta V of each battery pole group to be detected as a research object, carrying out distribution analysis, drawing to obtain a second distribution diagram, screening out isolated voltage drop distribution points from the second distribution diagram, wherein the isolated voltage drop distribution points are points larger than a preset voltage drop value, and calculating the offset B of the isolated voltage drop distribution points according to the voltage drop Y of the isolated voltage drop distribution points;
wherein, the preset voltage drop value is equal to the average value of the voltage drops DeltaV of all the plurality of battery pole groups to be detected, and the average value floats up by a preset proportion;
thirdly, if the offset A of the isolated full-power time distribution point is an increase amplitude, and the increase amplitude is larger than a preset increase amplitude threshold value, judging that the battery pole group corresponding to the isolated full-power time distribution point has the risk of overlarge coating amount of active substances of the battery pole pieces, and the battery pole group is a consistency difference pole group;
and if the offset B of the isolated voltage drop distribution point is a reduction amplitude, and the reduction amplitude is larger than a preset reduction amplitude threshold value, judging that the battery pole group corresponding to the isolated voltage drop distribution point has the risk of micro short circuit, and judging the battery pole group as a consistency difference pole group.
The battery pole group to be detected is a battery pole group after hot pressing;
the test charging device is a short circuit tester.
In the first step, the range of the preset charging voltage Vx is 10-2500V;
the preset charging time tz is 10 ms-20 s.
In the first step, in the charging process, the pressure of a preset size is applied to the battery pole group to be detected;
the pressure intensity of the preset size is more than 0.2MPa.
In the second step, the calculation formula of the offset a of the isolated full-power time distribution point is as follows:
A＝(X-C)/C；
x is the time value of the isolated full power time distribution point;
c is the average value of full power time tx of all the battery pole groups to be detected;
in the second step, the calculation formula of the offset B of the isolated voltage drop distribution point is as follows:
B＝(Y-D)/D；
y is the voltage drop value of the isolated voltage drop distribution point;
d is the average value of the voltage drops Δv of all the plurality of battery pole groups to be detected.
Wherein the preset increase amplitude threshold is 4%;
presetting a reduction amplitude threshold value to be 3%;
the preset proportion of floating up is 3%.
Compared with the prior art, the technical scheme provided by the invention provides a method for detecting the consistency of the battery pole group, which is used for screening the consistency of the battery pole group, so that the reject ratio increase caused by the consistency of the battery cells can be reduced, the purpose of pre-screening the consistency of the battery is achieved, the cost input caused by follow-up is reduced, the cost of manufacturing the battery is reduced, the service life risk of the battery PACK (PACK) is reduced, and the consistency of the battery PACK (PACK) is improved.
Drawings
FIG. 1 is a flow chart of a method for detecting consistency of battery pole groups;
FIG. 2 is a schematic diagram of the distribution diagram obtained in example 1 of the present invention;
fig. 3 is a schematic diagram of a distribution diagram obtained in example 2 of the present invention.
Detailed Description
In order to better understand the aspects of the present invention, the present invention will be described in further detail with reference to the drawings and embodiments.
Referring to fig. 1, the invention provides a method for detecting consistency of a battery pole group, which comprises the following steps:
firstly, applying a preset charging voltage Vx to a plurality of battery pole groups to be detected by using a test charging device, continuously charging the battery pole groups within a preset charging time period tz, and recording in real time a full-charge time tx required by each battery pole group to be detected to be fully charged to the preset charging voltage Vx, and a voltage drop DeltaV (i.e. a voltage reduction value) after the battery pole groups to be detected are fully charged to the preset charging voltage Vx and the preset charging time period tz is maintained;
secondly, taking the full-charge time tx of each battery pole group to be detected as a research object, carrying out distribution analysis, drawing to obtain a first distribution diagram (i.e. a distribution diagram of full-charge time), screening out isolated full-charge time distribution points (such as tx1 and tx 2) from the first distribution diagram, wherein the isolated full-charge time distribution points are points larger than a preset time value, and calculating the offset A of the isolated full-charge time distribution points according to the time value X of the isolated full-charge time distribution points; the preset time value is equal to a preset proportion (e.g. 3%) of the average value of the full-power time tx of all the plurality of battery pole groups to be detected, for example, the average value of all the full-power time tx is 729ms, and then the preset time value may be 729 x 1.03% = 750.87ms;
meanwhile, taking the voltage drop delta V of each battery pole group to be detected as a research object, carrying out distribution analysis, drawing to obtain a second distribution diagram (namely a distribution diagram of the voltage drops), screening out isolated voltage drop distribution points (such as delta V1 and delta V2) from the second distribution diagram, wherein the isolated voltage drop distribution points are points larger than a preset voltage drop value, and then calculating the offset B of the isolated voltage drop distribution points according to the voltage drop Y of the isolated voltage drop distribution points; wherein the preset voltage drop value is equal to the average value of the voltage drops DeltaV of all the plurality of battery pole groups to be detected, and the average value floats by a preset proportion (for example, 3 percent);
thirdly, if the offset A of the isolated full-power time distribution point is an increase amplitude, and the increase amplitude is larger than a preset increase amplitude threshold (for example, 4%), judging that the battery pole group corresponding to the isolated full-power time distribution point has the risk of overlarge coating amount of active substances of the battery pole pieces, and is a consistency poor pole group;
and if the offset B of the isolated voltage drop distribution point is a decreasing amplitude, and the decreasing amplitude is larger than a preset decreasing amplitude threshold (for example, 3%), judging that the battery pole group corresponding to the isolated voltage drop distribution point has the risk of micro short circuit, and judging the battery pole group as the consistency difference pole group.
In the present invention, in the first step, the battery electrode group to be detected is preferably a battery electrode group after hot pressing.
In the present invention, in the first step, the test charging device is any device capable of performing electric double layer charging and displaying time, for example, may be a short circuit tester.
In the invention, in the first step, the range of the preset charging voltage Vx is 10-2500V;
the preset charging time tz is 10 ms-20 s.
In the invention, in a first step, during the charging process, the battery pole group to be detected is subjected to a pressure of a preset magnitude;
the pressure of the preset magnitude is more than 0.2MPa, preferably 1.5MPa.
In the present invention, in the second step, the calculation formula of the offset a of the isolated full-power time distribution point is as follows:
A＝(X-C)/C；
x is the time value of the isolated full power time distribution point;
c is the average value of the full power time tx of all the plurality of battery pole groups to be detected.
In the present invention, in the second step, the calculation formula of the offset B of the isolated voltage drop distribution point is as follows:
B＝(Y-D)/D；
y is the voltage drop value of the isolated voltage drop distribution point;
d is the average value of the voltage drops Δv of all the plurality of battery pole groups to be detected.
It should be noted that, for the present invention, the change and the difference of the internal structure of the pole group are comprehensively determined by analyzing the distribution of the full power time tx of the plurality of battery pole groups; the distribution analysis of the voltage drop DeltaV of the battery pole group is used for carrying out the analysis of micro-short circuit self-discharge, and the consistency screening of the pole group is carried out through the two points.
In the invention, in particular implementation, a plurality of hard electrode groups after hot pressing are taken as research objects, the preset charging voltage Vx is 250V, the preset charging time length tz is 250ms, the positive electrode and the negative electrode of the electrode groups are connected with the positive electrode and the negative electrode of the charging equipment, and the pressure intensity is 1.5MPa for the plurality of electrode groups to charge. The times t1, t2, t3 … tn respectively possessed by the plurality of hard pole groups after hot pressing up to 250V, and the voltage drops Δv1, Δv2, Δv3 … Δv1 possessed after the preset charging period tz are maintained are recorded simultaneously. And carrying out distribution analysis by taking time (namely the full-charge time tx of each battery pole group to be detected) as a research object, screening out isolated full-charge time distribution points x1 and tx2, carrying out distribution analysis of micro-short circuit self-discharge by taking the voltage drop delta V of each battery pole group to be detected as the research object, and screening out isolated voltage drop distribution points delta V1 and delta V2. Meanwhile, the invention calculates and judges the percentage of the offset of the independent full-power time distribution point and the independent voltage drop distribution point, so that the electrode group is considered as a main object affecting the consistency of the battery because of relatively few internal electrochemical reaction sites or serious self-discharge, the consistency of the battery electrode group is poor, and the battery electrode group needs to be assembled in batches or isolated.
Based on the technical scheme, compared with the prior art, the method for screening the consistency of the polar group can monitor the consistency of the polar group. Meanwhile, microscopic analysis can be performed on the coating quantity and compaction state of the pole pieces in the pole group.
According to the invention, the electrode group consistency is detected by carrying out charging in a specific voltage and specific time range and comparing the actual full-power time tx with the voltage drop Vx distribution analysis. The isolated pole group or the pole groups with different grades are selected through screening, and pole group classification assembly is carried out on the battery cells, so that the control of the consistency of the battery cells is carried out from the pole group level, the control difficulty of the consistency of the battery cells is reduced, the cost waste caused by poor consistency is reduced, and the idea of low-cost control of enterprises is met.
For the invention, the detection method is different from the detection of the consistency of the electrode group by single-size measurement, and the accurate detection and the detection of micro-short circuit are carried out on the microscopic scale, so that the classification of the consistency of the electrode group is more accurately promoted, the classification of the consistency of batteries is further promoted, the cost risk caused by poor consistency of the batteries in the production process of enterprises is reduced, and the driving risk caused by poor consistency of battery cores of automobiles is reduced.
In order to more clearly understand the technical scheme of the present invention, the technical scheme of the present invention is described below through specific embodiments.
Example 1.
And taking the hard electrode group after hot pressing as a research object, charging the hard electrode group by using a short circuit tester, setting the voltage to be 250V and the time to be 250ms, connecting the anode and the cathode of the electrode group with the anode and the cathode of charging equipment, and applying the pressure of 1.5MPa to the given electrode group for charging. The times t1, t2, t3 … tn when charged to 250V are recorded simultaneously. And (3) carrying out distribution analysis by taking time as a study object, screening out isolated full-charge time points tx1 and tx2 (shown in fig. 2), wherein the preset time value is equal to the preset proportion (for example, 3%) of the average full-charge time tx of all the plurality of battery pole groups to be detected, and at the moment, the corresponding full-charge time distinguishing line (namely, the break line) is an M line, and the electric double layer charging time is obviously increased, so that the coating mass is increased. And the coating amount within the range is regulated to be normal within the coating tolerance, when the coating amount exceeds the upper limit and deviates by more than 1%, the coating amount can be considered to be larger, and meanwhile, the verification of a sample disassembly measurement method can be adopted. Therefore, the method can quantitatively judge the risk of excessive coating quantity of the pole group, so that the risk samples are assembled in batches or isolated.
Example 2.
And taking the hard electrode group after hot pressing as a research object, charging the hard electrode group by using a short circuit tester, setting the voltage to be 250V and the time to be 250ms, connecting the anode and the cathode of the electrode group with the anode and the cathode of charging equipment, and applying the pressure of 1.5MPa to the given electrode group for charging. The pressure drops DeltaV 1, deltaV 2, deltaV 3, deltaV 4, deltaVn at 250V are recorded simultaneously. And (3) carrying out distribution analysis by taking voltage drop as a research object, screening out isolated voltage drop distribution points delta Vx1 and delta Vx2 (shown in fig. 3), wherein the preset voltage drop value is equal to the average value of the voltage drops delta V of all the plurality of battery pole groups to be detected, and floating up by a preset proportion (for example, 3%), wherein at the moment, the corresponding voltage drop division line (i.e. break line) is N line, and carrying out percentage calculation judgment on the offset of the voltage drop division line, wherein the offset upper limit is more than 1%, which indicates that the situation of small hole discharge exists in the charging process, and the pole group has the risk of micro short circuit, and is assembled or isolated in batches.
Example 3.
The rolled positive and negative plates are used as research objects, the diaphragm is used as an intermediate spacer, the set voltage is 1500V, the time is 250ms, the positive and negative plates are connected with the positive and negative electrodes of the charging equipment, and the pressure is applied to 1.5MPa for charging. The pole pieces are provided with different compactions as variables, a single variable charging test is carried out, and the time t1, t2 and t3 … tn when the pole pieces are charged to 1500V are recorded. Comparing the time as a study object, comparing the charging time tx and ty of the test sample, and carrying out SEM analysis to judge the rolling condition of the test sample, wherein the time of large compaction is generally longer than that of small compaction, and the time-dependent change curve is obtained through different compactions, so that the rolling and crushing condition is judged qualitatively.
Compared with the prior art, the invention has the following beneficial technical effects:
1. the detection method of the invention is accurate detection of consistency in microscopic direction, is a comprehensive test means, and can detect comprehensive influence brought by aspects such as length and width of a pole piece, coating quantity, structural hot-pressing compactness, micro short circuit and the like.
2. The detection method can realize the advanced screening and monitoring of the consistency of the battery, so as to reduce the increase of the reject ratio caused by the consistency of the battery core, reduce the manufacturing cost of the battery and improve the consistency of the battery PACK PACK.
3. At present, no such method is used for detecting the consistency of the polar groups, and the detection method belongs to the creative method invention.
4. The detection method disclosed by the invention is closer to production, can be rapidly put into production, and can be combined with various devices.
5. The detection method is not limited to the detection of the just-hot-pressed pole group, and can be used for quickly detecting any assembly of components connected with the pole group.
6. The detection method provided by the invention has a wide application range, and comprises a round cell, a square cell, a soft-package cell and the like.
7. According to the detection method, the optimal charging time t of the battery cell in the same scheme can be comprehensively analyzed through the corresponding relation between the measurement time, the voltage drop and the performance of the battery cell, further, the parameters such as the optimal coating quantity, the rolling density and the like are reversely deduced through the relation between the coating quantity and the time, and the process is monitored in real time through t.
In summary, compared with the prior art, the method for detecting the consistency of the battery pole group provided by the invention is used as a method for screening the consistency of the battery pole group, and can screen the consistency of the battery pole group so as to reduce the increase of the reject ratio caused by the consistency of the battery core, thereby achieving the purpose of pre-screening the consistency of the battery, reducing the cost input caused by follow-up, being beneficial to reducing the manufacturing cost of the battery, reducing the service life risk of the battery PACK (PACK), and improving the consistency of the battery PACK (PACK).
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (5)
1. The method for detecting the consistency of the battery pole group is characterized by comprising the following steps of:
firstly, respectively applying a preset charging voltage Vx to a plurality of battery pole groups to be detected by using a test charging device, continuously carrying out double-layer charging within a preset charging time length tz, and recording full-charge time tx required by each battery pole group to be detected to be fully charged to the preset charging voltage Vx and voltage drop DeltaV after the battery pole groups to be detected are fully charged to the preset charging voltage Vx and the preset charging time length tz is maintained in real time;
secondly, taking the full-charge time tx of each battery pole group to be detected as a research object, carrying out distribution analysis, drawing to obtain a first distribution diagram, screening out isolated full-charge time distribution points from the first distribution diagram, wherein the isolated full-charge time distribution points are points larger than a preset time value, and calculating the offset A of the isolated full-charge time distribution points according to the time value X of the isolated full-charge time distribution points;
the preset time value is equal to the average value of the full power time tx of all the plurality of battery pole groups to be detected, and the average value floats by a preset proportion;
meanwhile, taking the voltage drop delta V of each battery pole group to be detected as a research object, carrying out distribution analysis, drawing to obtain a second distribution diagram, screening out isolated voltage drop distribution points from the second distribution diagram, wherein the isolated voltage drop distribution points are points larger than a preset voltage drop value, and calculating the offset B of the isolated voltage drop distribution points according to the voltage drop Y of the isolated voltage drop distribution points;
wherein, the preset voltage drop value is equal to the average value of the voltage drops DeltaV of all the plurality of battery pole groups to be detected, and the average value floats up by a preset proportion;
thirdly, if the offset A of the isolated full-power time distribution point is an increase amplitude, and the increase amplitude is larger than a preset increase amplitude threshold value, judging that the battery pole group corresponding to the isolated full-power time distribution point has the risk of overlarge coating amount of active substances of the battery pole pieces, and the battery pole group is a consistency difference pole group;
if the offset B of the isolated voltage drop distribution points is the reduction amplitude, and the reduction amplitude is larger than a preset reduction amplitude threshold value, judging that the battery pole group corresponding to the isolated voltage drop distribution points has the risk of micro short circuit, and judging the battery pole group as a consistency difference pole group;
in the second step, the calculation formula of the offset a of the isolated full power time distribution point is as follows:
A＝(X-C)/C；
x is the time value of the isolated full power time distribution point;
c is the average value of full power time tx of all the battery pole groups to be detected;
in the second step, the calculation formula of the offset B of the isolated voltage drop distribution point is as follows:
B＝(Y-D)/D；
y is the voltage drop value of the isolated voltage drop distribution point;
d is the average value of the voltage drops Δv of all the plurality of battery pole groups to be detected.
2. The method of claim 1, wherein the battery pole set to be inspected is a hot pressed battery pole set;
the test charging device is a short circuit tester.
3. The method according to claim 1, wherein in the first step, the preset charging voltage Vx ranges from 10 to 2500V;
the preset charging time tz is 10 ms-20 s.
4. The method according to claim 1, characterized in that in a first step, during the charging process, the battery pole group to be detected is subjected to a pressure of a preset magnitude;
the pressure intensity of the preset size is more than 0.2MPa.
5. The method of any one of claims 1 to 4, wherein the preset increase in magnitude threshold is 4%;
presetting a reduction amplitude threshold value to be 3%;
the preset proportion of floating up is 3%.
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| CN113281658B (en) * | 2021-04-21 | 2023-08-08 | 力神（青岛）新能源有限公司 | Method for judging reason of overtemperature of battery in testing process |
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