CN103163463B - Detection method for lithium ion batteries - Google Patents
Detection method for lithium ion batteries Download PDFInfo
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- CN103163463B CN103163463B CN201110413011.9A CN201110413011A CN103163463B CN 103163463 B CN103163463 B CN 103163463B CN 201110413011 A CN201110413011 A CN 201110413011A CN 103163463 B CN103163463 B CN 103163463B
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- battery core
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Abstract
The invention discloses a detection method for lithium ion batteries. The method is characterized by including the following steps: a) selecting a plurality of battery cells with the same preparation technology parameter for detection, calculating the direct current internal resistance value R of each battery cell respectively, and recording calculated results in sequence; b) finding a concentration area of data with minimum numerical values in the calculated results, and calculating a numerical average value, namely R(average), of the concentration area of the data with the minimum numerical values; and c) obtaining a difference value delta R by subtracting the R(average) from the direct current internal resistance value R of each battery cell, comparing the delta R with 1/2 R(average), if the delta R is larger than or equal to the 1/2 R(average), then determining that cold solder joints exist in the battery cells, and if the delta R is smaller than the 1/2 R(average), then determining that the cold solder joints do not exist in the battery cells. According to the detection method for the lithium ion batteries, whether the cold solder joints exist in the battery cells can be easily and effectively detected, the battery cells with the shortcomings of cold solder joints can be screened out in time, and therefore risks in use can be prevented.
Description
Technical field
The invention belongs to cell art, more specifically, the present invention relates to a kind of detection method of lithium ion battery.
Background technology
Welding is technique very crucial in cell production process, and the pole piece of not prison welding causes the internal resistance of cell very large, consistent poor performance in big current situation.Particularly for lamination process, because inside is actually pole piece parallel, therefore there is the pole plate of rosin joint then to there will be the uneven state of distribution of current, affect the power density of battery and cycle life etc., especially need to pay close attention in electrokinetic cell industry.
Rosin joint refers to that solder joint does not have fully effective seam, mainly contains two kinds of situations: the first case part seam, and at this moment adopting multimeter to detect is conducting, is not easy to find, but once there be the impact of vibrations or external force, easily sealing-off occurs.The second situation does not have seam completely, and namely solder joint is Mechanical Contact, and now will see that whether face of weld cleaning is clean, clear up totally, multimeter also shows conducting, and therefore, multimeter is not easy to detect rosin joint.
Current inspection is to the inspection method of battery rosin joint and disunity, and a kind of method applies external force with hand to soldered element, pull out several under, shake several under, strength is held by technician, not have loosening, can be judged as not having rosin joint; Another method directly observes solder joint, has rosin joint, and its welding edge and the face of weld are fitted not tight.Main employing two kinds of methods coordinate at present, judge whether there is rosin joint in battery core.
All there is certain defect in above-mentioned two kinds of methods, as applied the method for external force, the regulation that the dynamics of applying is ununified, different battery core welding technologys, the bad grasp of dynamics, can only be completed by those skilled in the art.And observe rule can only weld time carry out, after battery core has been assembled, then can not observe solder joint.Thus, need to propose a kind of method whether simple and effective inspection battery core inside exists rosin joint.
Summary of the invention
The present invention is intended at least one of solve the problems of the technologies described above.
For this reason, one object of the present invention is the detection method proposing a kind of lithium ion battery.
According to the detection method of the lithium ion battery of the embodiment of the present invention, it is characterized in that, comprising: a) select the identical battery core of multiple preparation technology parameter to carry out testing and calculate its DC internal resistance value R respectively, recording result of calculation in order; B) find out numerical value minimum data in result of calculation and concentrate district, and evaluation minimum data concentrates the digital average value in district, is designated as R
on average, wherein, described numerical value minimum data concentrate district to refer to the extreme difference of each data is less than or equal to minimum data value, described minimum data value is the data that numerical value minimum data concentrates numerical value in district minimum; C) the DC internal resistance value R of each battery core is deducted R
on averagevalue obtain difference DELTA R, by Δ R and 1/2R
on averagecompare, if Δ R>=1/2R
on average, then judge to there is rosin joint in battery core, if Δ R < is 1/2R
on averagethen judge to there is not rosin joint in battery core.
According to the detection method of the lithium ion battery of the embodiment of the present invention, whether can there is rosin joint in simple and effective inspection battery core inside, filter out the battery core that there is rosin joint defect in time, take precautions against application risk.
In addition, the detection method of lithium ion battery according to the above embodiment of the present invention, can also have following additional technical characteristic:
According to one embodiment of present invention, the test of described battery core comprises: a-1) battery core charged; A-2) according to the first electric current I 1, battery core is discharged, gather primary current value at interval of the first interval time, and magnitude of voltage U1 during record last collection current value; A-3) according to the second electric current I 2, battery core is discharged, gather primary current value at interval of the second interval time, and magnitude of voltage U2 during record last collection current value, wherein, the DC internal resistance value R of described battery core passes through following formulae discovery,
R＝(U2-U1)/(I2-I1)。
According to one embodiment of present invention, the sampling number of the battery core that described multiple preparation technology parameter is identical is more than or equal to 15.
According to one embodiment of present invention, described battery core charges to the 60%SOC of battery core prescribed model.
According to one embodiment of present invention, the scope of the first described electric current I 1 is 0.01C ~ 0.1C.
According to one embodiment of present invention, the first described interval time is 1 second.
According to one embodiment of present invention, described first electric current I 1 discharge time is 5 ~ 20 seconds.
According to one embodiment of present invention, the scope of the second described electric current I 2 is 0.7C ~ 10C.
According to one embodiment of present invention, the second described interval time is 0.2 second.
According to one embodiment of present invention, described second electric current I 2 discharge time is 0.8 ~ 2 second.
Additional aspect of the present invention and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage will become obvious and easy understand from accompanying drawing below combining to the description of embodiment, wherein:
Fig. 1 is the schematic flow sheet of the detection method of lithium ion battery according to the embodiment of the present invention.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", orientation or the position relationship of the instruction such as " outward " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limitation of the present invention can not be interpreted as.
In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance.
In describing the invention, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and such as, can be fixedly connected with, connect integratedly, also can be removably connect; Can be mechanical connection or electrical connection, also can be the connection of two element internals; Can be directly be connected, also indirectly can be connected by intermediary, for the ordinary skill in the art, the concrete meaning of above-mentioned term can be understood as the case may be.
First, the flow process of the detection method of lithium ion battery involved in the present invention is described with reference to figure 1.
Concrete, the detection method of lithium ion battery involved in the present invention can comprise the following steps:
A) select the identical battery core of multiple preparation technology parameter to carry out testing and calculate its DC internal resistance value R respectively, recording result of calculation in order;
B) find out numerical value minimum data in result of calculation and concentrate district, and evaluation minimum data concentrates the digital average value in district, is designated as R
on average, wherein, described numerical value minimum data concentrate district to refer to the extreme difference of each data is less than or equal to minimum data value, described minimum data value is the data that numerical value minimum data concentrates numerical value in district minimum;
C) the DC internal resistance value R of each battery core is deducted R
on averagevalue obtain difference DELTA R, by Δ R and 1/2R
on averagecompare, if Δ R>=1/2R
on average, then judge to there is rosin joint in battery core, if Δ R < is 1/2R
on averagethen judge to there is not rosin joint in battery core.
Thus, whether can there is rosin joint in simple and effective inspection battery core inside, filter out the battery core that there is rosin joint defect in time, take precautions against application risk.
Advantageously, the sampling number of the battery core that described multiple preparation technology parameter is identical is more than or equal to 15, and this numerical value can ensure that the DC internal resistance value of battery core exists numerical value minimum data and concentrates district.
The test of described battery core can specifically comprise the following steps:
A-1) battery core is charged;
A-2) according to the first electric current I 1, battery core is discharged, gather primary current value at interval of the first interval time, and magnitude of voltage U1 during record last collection current value;
A-3) according to the second electric current I 2, battery core is discharged, gather primary current value at interval of the second interval time, and magnitude of voltage U2 during record last collection current value,
Wherein, the DC internal resistance value R of described battery core passes through following formulae discovery,
R＝(U2-U1)/(I2-I1)。
According to one embodiment of present invention, described battery core charges to the 60%SOC of battery core prescribed model.
Advantageously, according to one embodiment of present invention, the scope of the first described electric current I 1 is 0.01C ~ 0.1C.
According to one embodiment of present invention, the first described interval time is 1 second.
According to one embodiment of present invention, described first electric current I 1 discharge time is 5 ~ 20 seconds.
Further advantageously, according to one embodiment of present invention, the scope of the second described electric current I 2 is 0.7C ~ 10C.
According to one embodiment of present invention, the second described interval time is 0.2 second.
According to one embodiment of present invention, described second electric current I 2 discharge time is 0.8 ~ 2 second.
The DC internal resistance value R calculating each battery core of gained is recorded as R1, R2, R3 ... Rm ... Rn in order, and wherein Rm represents the DC voltage value of m battery, and n is sampling number.
Then, find out result of calculation R1, R2, R3 ... Rm ... in Rn numerical value minimum data concentrate district, and evaluation minimum data concentrates the digital average value in district, is designated as R
on averagewherein, described numerical value minimum data concentrate the determination in district be by calculate extreme difference and compared with minimum data value gained, if the extreme difference of each data is less than or equal to minimum data value, then list numerical value minimum data in and concentrate district, described minimum data value is the data that numerical value minimum data concentrates numerical value in district minimum.
Finally, the DC internal resistance value Rm of each battery core is deducted R
on averagevalue obtain difference DELTA R, by Δ R and 1/2R
on averagecompare, if Δ R>=1/2R
on average, then judge to there is rosin joint in m battery core, if Δ R < is 1/2R
on averagethen judge to there is not rosin joint in m battery core.
Below by specific embodiment, the present invention is described.
Embodiment 1
A) Stochastic choice 16 batteries in certain battery factory is with a collection of battery core, battery core capacity is 3Ah, tests respectively and calculates its DC internal resistance value R, record result of calculation in order to the battery core of each battery;
A-1) battery battery core is charged to 60%SOC according to factory's prescribed model;
A-2) be 0.1C current discharge 10s according to the first electric current I 1, record primary voltage data p.s., the magnitude of voltage at the end of note 10s is U1;
A-3) be 1.0C current discharge 1s according to the second electric current I 2, every 0.2s records primary voltage data, and the magnitude of voltage at the end of note 1s is U2, and record the results are shown in Table 1.
The magnitude of voltage test result of table 1 battery battery core
The DC internal resistance value R of battery core is by following formulae discovery:
R＝(U2-U1)/(I2-I1)。
The DC internal resistance value R result of calculation of each battery battery core is in table 2.
The DC internal resistance value R (unit: Ω) of table 2 battery battery core
| Battery core | DC internal resistance |
| Battery core 1 | 0.1034 |
| Battery core 2 | 0.0589 |
| Battery core 3 | 0.0539 |
| Battery core 4 | 0.1039 |
| Battery core 5 | 0.1017 |
| Battery core 6 | 0.0519 |
| Battery core 7 | 0.1132 |
| Battery core 8 | 0.1266 |
| Battery core 9 | 0.0616 |
| Battery core 10 | 0.0564 |
| Battery core 11 | 0.0637 |
| Battery core 12 | 0.1076 |
| Battery core 13 | 0.0588 |
| Battery core 14 | 0.1251 |
| Battery core 15 | 0.0637 |
| Battery core 16 | 0.1118 |
B) find out numerical value minimum data in result of calculation and concentrate district, and evaluation minimum data concentrates the digital average value in district, is designated as R
on average.
As can be seen from Table 2, the DC internal resistance value R of battery core 2,3,6,9,10,11,13,15 is in a data concentration zones, and be that the value of DC internal resistance is relatively little, these DC internal resistance values are defined as numerical value minimum data and concentrate district, evaluation minimum data concentrates the digital average value R in district
on average=0.0586 ohm.
C) the DC internal resistance value R of each battery core is deducted R
on averagevalue obtain difference DELTA R, by Δ R and 1/2R
on averagecompare, if Δ R>=1/2R
on average, then judge to there is rosin joint in battery core, if Δ R < is 1/2R
on averagethen judge to there is not rosin joint in battery core.Wherein, numerical value minimum data concentrates battery core DC internal resistance value in district and R
on averagedifference DELTA R be significantly less than 1/2R
on average, directly can judge that these battery cores do not exist rosin joint, numerical value minimum data concentrates battery core DC internal resistance value outside district and R
on averagethe result of calculation of difference DELTA R in table 3.
Table 3 numerical value minimum data concentrates battery core DC internal resistance value outside district and R
on averagedifference
As can be seen from Table 3, numerical value minimum data concentrates battery core DC internal resistance value outside district and R
on averagedifference be all greater than 1/2R
on average, thus, can judge that in this batch of battery, the 1st, 4,5,7,8,12,14, No. 16 battery core inside exists rosin joint.
Can be reached a conclusion by above-described embodiment: according to the detection method of the lithium ion battery of the embodiment of the present invention, whether can there is rosin joint in simple and effective inspection battery core inside, filter out the battery core that there is rosin joint defect in time, take precautions against application risk, and bring certain economic benefit.
In the description of this instructions, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Although illustrate and describe embodiments of the invention, those having ordinary skill in the art will appreciate that: can carry out multiple change, amendment, replacement and modification to these embodiments when not departing from principle of the present invention and aim, scope of the present invention is by claim and equivalents thereof.
Claims (10)
1. a detection method for lithium ion battery, is characterized in that, comprising:
A) select the identical battery core of multiple preparation technology parameter to carry out testing and calculate its DC internal resistance value R respectively, recording result of calculation in order;
B) find out numerical value minimum data in result of calculation and concentrate district, and evaluation minimum data concentrates the digital average value in district, is designated as R
on average, wherein, described numerical value minimum data concentrate district to refer to the extreme difference of each data is less than or equal to minimum data value, described minimum data value is the data that numerical value minimum data concentrates numerical value in district minimum;
C) the DC internal resistance value R of each battery core is deducted R
on averagevalue obtain difference DELTA R, by Δ R and 1/2R
on averagecompare, if Δ R>=1/2R
on average, then judge to there is rosin joint in battery core, if Δ R < is 1/2R
on averagethen judge to there is not rosin joint in battery core.
2. the detection method of lithium ion battery according to claim 1, is characterized in that, the test of described battery core comprises:
A-1) battery core is charged;
A-2) according to the first electric current I 1, battery core is discharged, gather primary current value at interval of the first interval time, and magnitude of voltage U1 during record last collection current value;
A-3) according to the second electric current I 2, battery core is discharged, gather primary current value at interval of the second interval time, and magnitude of voltage U2 during record last collection current value,
Wherein, the DC internal resistance value R of described battery core passes through following formulae discovery,
R＝(U2-U1)/(I2-I1)。
3. the detection method of lithium ion battery according to claim 1, is characterized in that, the sampling number of the battery core that described multiple preparation technology parameter is identical is more than or equal to 15.
4. the detection method of lithium ion battery according to claim 2, is characterized in that, described battery core charges to the 60%SOC of battery core prescribed model.
5. the detection method of lithium ion battery according to claim 2, is characterized in that, the scope of the first described electric current I 1 is 0.01C ~ 0.1C.
6. the detection method of lithium ion battery according to claim 2, is characterized in that, the first described interval time is 1 second.
7. the detection method of lithium ion battery according to claim 2, is characterized in that, described first electric current I 1 discharge time is 5 ~ 20 seconds.
8. the detection method of lithium ion battery according to claim 2, is characterized in that, the scope of the second described electric current I 2 is 0.7C ~ 10C.
9. the detection method of lithium ion battery according to claim 2, is characterized in that, the second described interval time is 0.2 second.
10. the detection method of lithium ion battery according to claim 2, is characterized in that, described second electric current I 2 discharge time is 0.8 ~ 2 second.
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| CN201110413011.9A CN103163463B (en) | 2011-12-12 | 2011-12-12 | Detection method for lithium ion batteries |
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| CN104808098A (en) * | 2014-12-08 | 2015-07-29 | 惠州市亿能电子有限公司 | Method for testing welding reliability of electrical core module |
| CN105903690B (en) * | 2016-04-27 | 2018-06-29 | 珠海光宇电池有限公司 | It is a kind of to screen the method for recycling bad battery core |
| CN106154181A (en) * | 2016-08-22 | 2016-11-23 | 上海方德尚动新能源科技有限公司 | A kind of battery bag bonding welding detection system and welding and method |
| CN106597297A (en) * | 2016-11-18 | 2017-04-26 | 常州普莱德新能源电池科技有限公司 | Lithium ion battery pseudo soldering detection method |
| CN107783056A (en) * | 2017-10-09 | 2018-03-09 | 力信（江苏）能源科技有限责任公司 | A kind of cell polar ear welds rosin joint detection method |
| CN108196123B (en) * | 2017-12-27 | 2020-07-14 | 惠州亿纬锂能股份有限公司 | Method for judging abnormity of internal resistance of lithium ion battery cell |
| CN109738804A (en) * | 2018-12-29 | 2019-05-10 | 连云港正道电池技术有限公司 | A kind of lithium titanate battery mould group ultrasonic bonding rosin joint detection method and its detection device |
| CN112731168B (en) * | 2020-12-18 | 2022-08-09 | 合肥国轩高科动力能源有限公司 | Method for detecting poor welding of lithium iron phosphate battery tab |
| CN114062930B (en) * | 2021-11-16 | 2023-06-09 | 蜂巢能源科技有限公司 | Method, device and equipment for detecting abnormal contact of battery cell tab |
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