CN103163463A - Detection method for lithium ion batteries - Google Patents

Detection method for lithium ion batteries Download PDF

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Publication number
CN103163463A
CN103163463A CN2011104130119A CN201110413011A CN103163463A CN 103163463 A CN103163463 A CN 103163463A CN 2011104130119 A CN2011104130119 A CN 2011104130119A CN 201110413011 A CN201110413011 A CN 201110413011A CN 103163463 A CN103163463 A CN 103163463A
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battery core
detection
average
lithium ion
value
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CN2011104130119A
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CN103163463B (en
Inventor
余修涛
乔贞美
张会平
吴生先
李志华
任晓玲
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Kunming Branch of BAIC Yunnan Ruili Automobile Co., Ltd
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Beiqi Foton Motor Co Ltd
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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

A kind of detection method of lithium ion battery
Technical field
The invention belongs to the battery technology field, more specifically, the present invention relates to a kind of detection method of lithium ion battery.
Background technology
Welding is technique very crucial in the battery production process, and the pole piece of not prison welding causes the internal resistance of cell very large, consistent poor performance under large current conditions.Particularly for lamination process, because inside is actually pole piece parallel, therefore there is the pole plate of rosin joint the inhomogeneous state of distribution of current can occur, affect the power density of battery and cycle life etc., especially need concern in the electrokinetic cell industry.
Rosin joint refers to that solder joint does not have fully effective seam, mainly contains two kinds of situations: the seam of the first case part, at this moment adopting multimeter to detect is conducting, is not easy discovery, but in a single day the impact of vibrations or external force is arranged, and sealing-off easily occurs.The second situation is there is no seam fully, and namely solder joint is Mechanical Contact, will see whether face of weld cleaning is clean, clears up totally, and multimeter also shows conducting, and therefore, multimeter is not easy to detect rosin joint this moment.
Check at present inspection method and disunity to the battery rosin joint, a kind of method is to apply external force with hand to soldered element, pull out several under, shake several under, strength is held by the technician, not have to become flexible, can be judged as does not have rosin joint; Another method is directly to observe solder joint, and rosin joint is arranged, and its welding edge and the face of weld are fitted not tight.Two kinds of methods of main employing coordinate at present, judge whether there is rosin joint in battery core.
All there is certain defective in above-mentioned two kinds of methods, as apply the method for external force, and the dynamics that applies does not have unified regulation, different battery core welding technologys, and the bad grasp of dynamics can only be completed by those skilled in the art.Can only carry out when welding and observe rule, after the battery core assembling is completed, can not observe solder joint.Thereby, the method whether a kind of simple and effective check battery core inside exists rosin joint need to be proposed.
Summary of the invention
The present invention is intended to one of solve the problems of the technologies described above at least.
For this reason, one object of the present invention is to propose a kind of detection method of lithium ion battery.
Detection method according to the lithium ion battery of the embodiment of the present invention is characterized in that, comprising: a) select the identical battery core of a plurality of preparation technology parameters to test and calculate respectively its DC internal resistance value R, record in order result of calculation; B) find out in result of calculation the numerical value minimum data and concentrate the district, and the evaluation minimum data concentrates the digital average value in district, be designated as R On average, wherein, described numerical value minimum data concentrates extreme difference that the district refers to each data less than or equal to the minimum data value, and described minimum data value is the data that the numerical value minimum data is concentrated numerical value minimum in the district; C) the DC internal resistance value R with each battery core deducts R On averageValue obtain difference DELTA R, with Δ R and 1/2R On averageCompare, if Δ R 〉=1/2R On average, judge to have rosin joint in battery core, if Δ R<1/2R On averageJudge and do not have rosin joint in battery core.
According to the detection method of the lithium ion battery of the embodiment of the present invention, can simple and effective check battery core inside whether have rosin joint, in time filter out the battery core that has the rosin joint defective, 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 characterictic:
According to one embodiment of present invention, the test of described battery core comprises: a-1) battery core is charged; A-2) according to the first electric current I 1 with battery core discharge, at interval of gathering the primary current value the first interval time, and the magnitude of voltage U1 that record is last when gathering current value; A-3) according to the second electric current I 2 with battery core discharge, at interval of gathering the primary current value the second interval time, and the magnitude of voltage U2 that record is last when gathering current value, wherein, the DC internal resistance value R of described battery core calculates by following formula,
R=(U2-U1)/(I2-I1)。
The sampling number of the battery core that according to one embodiment of present invention, described a plurality of 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 described the first electric current I 1 is 0.01C~0.1C.
According to one embodiment of present invention, described the first interval time is 1 second.
According to one embodiment of present invention, described the first 1 discharge time of electric current I is 5~20 seconds.
According to one embodiment of present invention, the scope of described the second electric current I 2 is 0.7C~10C.
According to one embodiment of present invention, described the second interval time is 0.2 second.
According to one embodiment of present invention, described the second 2 discharge times of electric current I are 0.8~2 second.
Additional aspect of the present invention and advantage part in the following description provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Description of drawings
Above-mentioned and/or additional aspect of the present invention and advantage are from obviously and easily understanding becoming the description of embodiment in conjunction with following accompanying drawing, wherein:
Fig. 1 is the schematic flow sheet according to the detection method of the lithium ion battery of the embodiment of the present invention.
Embodiment
The below describes embodiments of the invention in detail, and the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or the element with identical or similar functions from start to finish.Be exemplary below by the embodiment that is described with reference to the drawings, only be used for explaining the present invention, and can not be interpreted as limitation of the present invention.
in description of the invention, it will be appreciated that, term " " center ", " vertically ", " laterally ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", orientation or the position relationship of indications 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, rather than device or the element of indication or hint indication must have specific orientation, with specific orientation structure and operation, therefore can not be interpreted as limitation of the present invention.
In addition, term " first ", " second " only are used for describing purpose, and can not be interpreted as indication or hint relative importance.
In description of the invention, need to prove, unless clear and definite regulation and restriction are separately arranged, term " installation ", " being connected ", " connection " should be done broad understanding, for example, can be to be fixedly connected with, connect integratedly, can be also to removably connect; Can be mechanical connection or electrical connection, can be also the connection of two element internals; Can be directly to be connected, also can indirectly be connected by intermediary, for the ordinary skill in the art, can understand as the case may be the concrete meaning of above-mentioned term.
At 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 a plurality of preparation technology parameters to test and calculate respectively its DC internal resistance value R, record in order result of calculation;
B) find out in result of calculation the numerical value minimum data and concentrate the district, and the evaluation minimum data concentrates the digital average value in district, be designated as R On average, wherein, described numerical value minimum data concentrates extreme difference that the district refers to each data less than or equal to the minimum data value, and described minimum data value is the data that the numerical value minimum data is concentrated numerical value minimum in the district;
C) the DC internal resistance value R with each battery core deducts R On averageValue obtain difference DELTA R, with Δ R and 1/2R On averageCompare, if Δ R 〉=1/2R On average, judge to have rosin joint in battery core, if Δ R<1/2R On averageJudge and do not have rosin joint in battery core.
Thus, can simple and effective check battery core inside whether have rosin joint, in time filter out the battery core that has the rosin joint defective, take precautions against application risk.
Advantageously, the sampling number of the battery core that described a plurality of preparation technology parameters are identical is more than or equal to 15, and this numerical value can guarantee that the DC internal resistance value of battery core exists the numerical value minimum data to concentrate the 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 with battery core discharge, at interval of gathering the primary current value the first interval time, and the magnitude of voltage U1 that record is last when gathering current value;
A-3) according to the second electric current I 2 with battery core discharge, at interval of gathering the primary current value the second interval time, and the magnitude of voltage U2 that record is last when gathering current value,
Wherein, the DC internal resistance value R of described battery core calculates by following formula,
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 described the first electric current I 1 is 0.01C~0.1C.
According to one embodiment of present invention, described the first interval time is 1 second.
According to one embodiment of present invention, described the first 1 discharge time of electric current I is 5~20 seconds.
Further advantageously, according to one embodiment of present invention, the scope of described the second electric current I 2 is 0.7C~10C.
According to one embodiment of present invention, described the second interval time is 0.2 second.
According to one embodiment of present invention, described the second 2 discharge times of electric current I are 0.8~2 second.
With the DC internal resistance value R that calculates each battery core of gained be recorded as in order R1, R2, R3 ... Rm ... Rn, wherein Rm represents the dc voltage value of m battery, n is sampling number.
Then, find out result of calculation R1, R2, R3 ... Rm ... in Rn, the numerical value minimum data is concentrated the district, and the evaluation minimum data concentrates the digital average value in district, is designated as R On averageWherein, described numerical value minimum data is concentrated determining by calculating extreme difference and the gained of comparing with the minimum data value of district, if the extreme difference of each data is less than or equal to the minimum data value, list the numerical value minimum data in and concentrate the district, described minimum data value is the data that the numerical value minimum data is concentrated numerical value minimum in the district.
At last, the DC internal resistance value Rm with each battery core deducts R On averageValue obtain difference DELTA R, with Δ R and 1/2R On averageCompare, if Δ R 〉=1/2R On average, judge in m battery core to have rosin joint, if Δ R<1/2R On averageJudge in m battery core and do not have rosin joint.
Below by specific embodiment, the present invention is described.
Embodiment 1
A) select 16 batteries certain battery factory is random in a collection of battery core, the battery core capacity is 3Ah, respectively its DC internal resistance value R is tested and calculated to the battery core of each battery, records in order result of calculation;
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 the primary voltage data p.s., the magnitude of voltage when note 10s finishes is U1;
A-3) be 1.0C current discharge 1s according to the second electric current I 2, every 0.2s records the primary voltage data, and the magnitude of voltage when note 1s finishes 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 calculates by following formula:
R=(U2-U1)/(I2-I1)。
The DC internal resistance value R result of calculation of each battery battery core sees 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 in result of calculation the numerical value minimum data and concentrate the district, and the evaluation minimum data concentrates the digital average value in district, be designated as R On average
As can be seen from Table 2, battery core 2,3,6,9,10,11,13,15 DC internal resistance value R are in a data concentration zones, and be the value less of DC internal resistance, these DC internal resistance values be defined as the numerical value minimum data concentrate the district, the evaluation minimum data is concentrated the digital average value R in district On average=0.0586 ohm.
C) the DC internal resistance value R with each battery core deducts R On averageValue obtain difference DELTA R, with Δ R and 1/2R On averageCompare, if Δ R 〉=1/2R On average, judge to have rosin joint in battery core, if Δ R<1/2R On averageJudge and do not have rosin joint in battery core.Wherein, the numerical value minimum data is concentrated battery core DC internal resistance value and the R in the district On averageDifference DELTA R be significantly less than 1/2R On average, can judge directly that there is not rosin joint in these battery cores, the numerical value minimum data is concentrated battery core DC internal resistance value and the R outside the district On averageThe result of calculation of difference DELTA R see Table 3.
Table 3 numerical value minimum data is concentrated battery core DC internal resistance value and the R outside the district On averageDifference
As can be seen from Table 3, the numerical value minimum data is concentrated battery core DC internal resistance value and the R outside the district On averageDifference all greater than 1/2R On average, thus, can judge in this batch battery that there is rosin joint in the 1st, 4,5,7,8,12,14, No. 16 battery core inside.
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, can simple and effective check battery core inside whether have rosin joint, in time filter out the battery core that has the rosin joint defective, take precautions against application risk, and bring certain economic benefit.
In the description of this instructions, the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present invention or example in conjunction with specific features, structure, material or the characteristics of this embodiment or example description.In this manual, the schematic statement of above-mentioned term not necessarily referred to identical embodiment or example.And the specific features of description, structure, material or characteristics can be with suitable mode combinations in any one or more embodiment or example.
Although illustrated and described embodiments of the invention, those having ordinary skill in the art will appreciate that: in the situation that do not break away from principle of the present invention and aim can be carried out multiple variation, modification, replacement and modification to these embodiment, scope of the present invention is limited by claim and equivalent thereof.

Claims (10)

1. the detection method of a lithium ion battery, is characterized in that, comprising:
A) select the identical battery core of a plurality of preparation technology parameters to test and calculate respectively its DC internal resistance value R, record in order result of calculation;
B) find out in result of calculation the numerical value minimum data and concentrate the district, and the evaluation minimum data concentrates the digital average value in district, be designated as R On average, wherein, described numerical value minimum data concentrates extreme difference that the district refers to each data less than or equal to the minimum data value, and described minimum data value is the data that the numerical value minimum data is concentrated numerical value minimum in the district;
C) the DC internal resistance value R with each battery core deducts R On averageValue obtain difference DELTA R, with Δ R and 1/2R On averageCompare, if Δ R 〉=1/2R On average, judge to have rosin joint in battery core, if Δ R<1/2R On averageJudge and do not have 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 with battery core discharge, at interval of gathering the primary current value the first interval time, and the magnitude of voltage U1 that record is last when gathering current value;
A-3) according to the second electric current I 2 with battery core discharge, at interval of gathering the primary current value the second interval time, and the magnitude of voltage U2 that record is last when gathering current value,
Wherein, the DC internal resistance value R of described battery core calculates by following formula,
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 a plurality of preparation technology parameters are 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 described the first 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, be 1 second described the first interval time.
7. the detection method of lithium ion battery according to claim 2, is characterized in that, be 5~20 seconds described the first 1 discharge time of electric current I.
8. the detection method of lithium ion battery according to claim 2, is characterized in that, the scope of described the second electric current I 2 is 0.7C~10C.
9. the detection method of lithium ion battery according to claim 2, is characterized in that, be 0.2 second described the second interval time.
10. the detection method of lithium ion battery according to claim 2, is characterized in that, be 0.8~2 second described the second 2 discharge times of electric current I.
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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
CN105903690A (en) * 2016-04-27 2016-08-31 珠海光宇电池有限公司 Method for screening poor-cycling battery cell
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
CN108196123A (en) * 2017-12-27 2018-06-22 惠州亿纬锂能股份有限公司 A kind of evaluation method of lithium ion battery cell internal resistance exception
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

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Cited By (8)

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Publication number Priority date Publication date Assignee Title
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
CN105903690A (en) * 2016-04-27 2016-08-31 珠海光宇电池有限公司 Method for screening poor-cycling battery cell
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
CN108196123A (en) * 2017-12-27 2018-06-22 惠州亿纬锂能股份有限公司 A kind of evaluation method of lithium ion battery cell internal resistance exception
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

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