CN105006597A - Method for fast evaluating conformity of lithium ion battery electrode production with symmetric electrodes - Google Patents
Method for fast evaluating conformity of lithium ion battery electrode production with symmetric electrodes Download PDFInfo
- Publication number
- CN105006597A CN105006597A CN201510253241.1A CN201510253241A CN105006597A CN 105006597 A CN105006597 A CN 105006597A CN 201510253241 A CN201510253241 A CN 201510253241A CN 105006597 A CN105006597 A CN 105006597A
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- Prior art keywords
- electrode
- conformity
- lithium ion
- diameter
- battery
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 21
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 19
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title abstract description 6
- 238000012360 testing method Methods 0.000 claims abstract description 10
- 238000000157 electrochemical-induced impedance spectroscopy Methods 0.000 claims abstract description 5
- 230000005284 excitation Effects 0.000 claims abstract description 5
- 238000010998 test method Methods 0.000 claims abstract description 5
- 238000011156 evaluation Methods 0.000 claims description 13
- 230000004888 barrier function Effects 0.000 claims description 12
- 238000001453 impedance spectrum Methods 0.000 claims description 8
- 239000003792 electrolyte Substances 0.000 claims description 6
- 230000003068 static effect Effects 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 5
- 235000012431 wafers Nutrition 0.000 abstract 5
- 239000012528 membrane Substances 0.000 abstract 3
- 238000001566 impedance spectroscopy Methods 0.000 abstract 2
- 239000008151 electrolyte solution Substances 0.000 abstract 1
- 229940021013 electrolyte solution Drugs 0.000 abstract 1
- 238000005457 optimization Methods 0.000 abstract 1
- 238000001228 spectrum Methods 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
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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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- 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]
-
- 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
- H01M10/4285—Testing apparatus
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention discloses a method for fast evaluating the conformity of lithium ion battery electrode production with symmetric electrodes. The method adopts an electrochemical impedance spectroscopy test method. The method comprises the following steps that homopolar electrodes in the same batch are selected to be blanked into wafers; two prepared wafers are taken, a membrane is added between the two wafers, and the diameter of the membrane is larger than that of the wafers; the two wafers and the membrane are installed in a battery model, and pressure is fixed; electrolyte solutions are injected in the battery model and stood for 0.5-1.5 h; excitation of an alternating current signal is applied to a battery to perform an impedance spectroscopy test; the homopolar electrodes of another batch are selected, the above steps are repeated, and the variation trends of impedance spectroscopy of the electrodes in the different batches are compared. According to the method, not only can the microcosmic characteristic of the electrodes be effectively evaluated, but also the production efficiency can be improved; meanwhile, the improvement and optimization of the production technology are facilitated, and therefore the conformity of single batteries is improved.
Description
Technical field
The present invention relates to battery technology detection field, particularly by the method for symmetry electrode Fast Evaluation lithium ion cell electrode conformity of production.
Background technology
At present, have that energy density is high, long service life, security performance are good, and green power supply----lithium ion battery applications is extensive.Lithium ion battery is widely used in the field such as energy storage, power.Test finds, the same battery made, and the useful life of battery pack will lower than the useful life of cell, and this illustrates that battery consistency obviously affects the useful life of battery.In the connection in series-parallel application of battery, the efficiency of battery with two side terminals problems affect battery and life-span, and safety problem also has impact.So the conforming requirement combining the cell of battery pack should be stricter.
Ensure battery with two side terminals, first will ensure that every initial performance of battery is consistent, the self discharge of battery will be consistent, and fading rate in use will be consistent.The conforming screening of current battery is screened battery capacity, internal resistance, voltage, discharge and recharge discharge platform and self discharge difference under mainly utilizing normal temperature, low temperature and hot environment.
At present the conformity of production evaluation of electric vehicle lithium-ion-power cell is only confined in the quantitative assessment to " macroscopic view " parameter, but these macroparameters often can not evaluate " microcosmic " characteristic of electrode effectively.In the conforming influencing factor of lithium ion battery, the consistency of electrode is the most key, also the most direct, therefore probe into out a kind of electrode conforming method evaluated effectively, rapidly and no matter the stability between production batch is understood in time to battery enterprise, or to improving production technology, all there is very strong realistic meaning.
Summary of the invention
For overcoming above-mentioned the deficiencies in the prior art, the invention provides a kind of method of symmetry electrode Fast Evaluation lithium ion cell electrode conformity of production, solve existing only can from the problem macroscopically evaluating lithium ion battery conformity of production.
The technical solution used in the present invention is:
By the method for symmetry electrode Fast Evaluation lithium ion cell electrode conformity of production, it is characterized in that, adopt electrochemical impedance spectroscopy method of testing, comprise the following steps:
(1) select the homopolarity electrode slice of same batch, stamping-out becomes disk;
(2) get the two panels disk that step (1) is obtained, between two panels, add barrier film, the diameter of barrier film is greater than the diameter of disk;
(3) battery model is loaded, fixation pressure;
(4) electrolyte is injected, static 0.5 ~ 1.5h;
(5) battery is applied to the excitation of an AC signal, carry out impedance spectrum sweep test;
(6) get the homopolarity electrode slice of another batch, repeat step (1) ~ step (5), compare the variation tendency of different batches electrode slice impedance spectrum.
Wherein, preferably, the diameter of described disk is 4 ~ 6cm, the diameter of described barrier film be 5 ~ 7cm.
Wherein, preferably, the diameter of described disk is 5cm, the diameter of described barrier film be 6cm.
Wherein, preferably, the injection rate of described electrolyte is 2.0 ± 0.2g.
Wherein, preferably, the frequency of described AC signal is 0.01Hz ~ 10kHz.
Wherein, preferably, the force value in described step (3) is 0.1MPa.
In the present invention, symmetry electrode refers to the homopolarity electrode (negative or positive electrode) of different batches.
Beneficial effect of the present invention:
The method that the present invention proposes mainly be used for evaluating lithium ion battery produce in the consistency of pole piece between different batches, the method can not only evaluate " microcosmic " characteristic of electrode effectively, and evaluate fast, can enhance productivity, also be conducive to improvement, optimized production process simultaneously, thus improve the consistency of cell.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the consistency comparison diagram of the positive pole of 3 different batches in embodiment 1;
Fig. 2 is the consistency comparison diagram of the positive pole of 2 different batches in embodiment 2;
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment 1
Lithium battery production line is selected the anode pole piece of three different batches (A/B/C), is prepared into model battery.
Adopt the method for symmetry electrode Fast Evaluation lithium ion cell electrode conformity of production, adopt electrochemical impedance spectroscopy method of testing, comprise the following steps:
(1) select the anode electrode sheet of A batch, stamping-out becomes diameter to be the disk of 5cm;
(2) get the two panels disk that step (1) is obtained, between two panels, add barrier film, the diameter of barrier film is 6cm;
(3) load battery model, fixation pressure, pressure is 0.1MPa;
(4) 2g electrolyte is injected, static 1h;
(5) battery is applied to the excitation of an AC signal, voltage drive is 5mV, and frequency range: 0.01Hz ~ 10kHz carries out impedance spectrum sweep test;
(6) get the homopolarity electrode slice of B batch and C batch, respectively repeat steps (1) ~ step (5), compare the variation tendency of different batches electrode slice impedance spectrum.
Fig. 1 be three batches between uniformity test result, as can be seen from test result, in diffusion phase, consistency comparison in difference is large, and the diffusion impedance of this electrode interior indirectly illustrated is larger, the porosity difference to some extent of electrode.
Meanwhile, we also tested A batch, the anti-spectrum of B batch and C batch of cathode pole piece, and compare the variation tendency of different batches, result shows, and the variation tendency of the anti-spectrum of cathode pole piece is identical with the variation tendency of anode pole piece.
Embodiment 2
According to the test result of embodiment 1, the production technology of lithium battery is improved, comprise the adjustment of coating speed and oven temperature gradient, then select the anode pole piece selecting A batch and B batch on lithium battery production line, be prepared into model battery.
Adopt the method for symmetry electrode Fast Evaluation lithium ion cell electrode conformity of production, the method adopts electrochemical impedance spectroscopy method of testing, comprises the following steps:
(1) select the anode electrode sheet of A batch, stamping-out becomes diameter to be the disk of 4cm;
(2) get the two panels disk that step (1) is obtained, between two panels, add barrier film, the diameter of barrier film is 5cm;
(3) load battery model, fixation pressure, pressure is 0.1MPa;
(4) 2g electrolyte is injected, static 1h;
(5) battery is applied to the excitation of an AC signal, voltage drive is 5mV, and frequency range: 0.01Hz ~ 10kHz carries out impedance spectrum sweep test;
(6) get B batch of anode electrode sheet, respectively repeat steps (1) ~ step (5), compare the variation tendency of different batches electrode slice impedance spectrum.
Fig. 2 is the uniformity test result improving rear electrode, can find out that consistency is greatly improved.
Meanwhile, we also tested the anti-spectrum of A batch and B batch of cathode pole piece, and compare the variation tendency of different batches, result shows, and the variation tendency of the anti-spectrum of cathode pole piece is identical with the variation tendency of anode pole piece.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. by the method for symmetry electrode Fast Evaluation lithium ion cell electrode conformity of production, it is characterized in that, adopt electrochemical impedance spectroscopy method of testing, comprise the following steps:
(1) select the homopolarity electrode slice of same batch, stamping-out becomes disk;
(2) get the two panels disk that step (1) is obtained, between two panels, add barrier film, the diameter of barrier film is greater than the diameter of disk;
(3) battery model is loaded, fixation pressure;
(4) electrolyte is injected, static 0.5 ~ 1.5h;
(5) battery is applied to the excitation of an AC signal, carry out impedance spectrum sweep test;
(6) get the homopolarity electrode slice of another batch, repeat step (1) ~ step (5), compare the variation tendency of different batches electrode slice impedance spectrum.
2. the described method with symmetry electrode Fast Evaluation lithium ion cell electrode conformity of production according to claim 1, is characterized in that: the diameter of described disk is 4 ~ 6cm, the diameter of described barrier film be 5 ~ 7cm.
3. the method for a kind of symmetry electrode Fast Evaluation lithium ion cell electrode conformity of production according to claim 2, is characterized in that: the diameter of described disk is 5cm, the diameter of described barrier film be 6cm.
4. the method for symmetry electrode Fast Evaluation lithium ion cell electrode conformity of production according to claim 1, is characterized in that: the injection rate of described electrolyte is 2.0 ± 0.2g.
5. the method for symmetry electrode Fast Evaluation lithium ion cell electrode conformity of production according to claim 1, is characterized in that: the frequency of described AC signal is 0.01Hz ~ 10kHz.
6. the method for symmetry electrode Fast Evaluation lithium ion cell electrode conformity of production according to claim 1, is characterized in that: the force value in described step (3) is 0.1MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510253241.1A CN105006597B (en) | 2015-05-18 | 2015-05-18 | With the method for symmetry electrode Fast Evaluation lithium ion cell electrode conformity of production |
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| CN201510253241.1A CN105006597B (en) | 2015-05-18 | 2015-05-18 | With the method for symmetry electrode Fast Evaluation lithium ion cell electrode conformity of production |
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| CN105006597A true CN105006597A (en) | 2015-10-28 |
| CN105006597B CN105006597B (en) | 2017-06-27 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108511815A (en) * | 2018-02-28 | 2018-09-07 | 合肥国轩高科动力能源有限公司 | A kind of evaluation method and system of lithium ion battery consistency |
| CN108508067A (en) * | 2018-02-11 | 2018-09-07 | 多氟多（焦作）新能源科技有限公司 | A method of evaluating the battery material of lithium ion battery using Symmetrical cells |
| CN109346674A (en) * | 2018-09-19 | 2019-02-15 | 惠州亿纬锂能股份有限公司 | A kind of battery pole piece baking method |
| CN109856549A (en) * | 2019-01-18 | 2019-06-07 | 合肥国轩高科动力能源有限公司 | A kind of evaluation method of lithium ion cell electrode loop attenuation mechanism |
| CN112687884A (en) * | 2020-12-14 | 2021-04-20 | 风帆有限责任公司 | Lithium battery for testing impedance of battery pole piece in situ and manufacturing method thereof |
| CN116008848A (en) * | 2023-02-03 | 2023-04-25 | 济南大学 | Application of color difference technology in detection of electrode material and electrode plate state of lithium ion battery |
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| US4423378A (en) * | 1981-12-04 | 1983-12-27 | Bear Automotive Service Equipment Company | Automotive battery test apparatus |
| CN101866758A (en) * | 2010-05-10 | 2010-10-20 | 河南大学 | Evaluation method of photoanode electron transmission performance of dye sensitization solar batteries |
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| CN103840225A (en) * | 2014-03-27 | 2014-06-04 | 合肥国轩高科动力能源股份公司 | Screening method for lithium ion battery |
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2015
- 2015-05-18 CN CN201510253241.1A patent/CN105006597B/en not_active Expired - Fee Related
Patent Citations (5)
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| US4423378A (en) * | 1981-12-04 | 1983-12-27 | Bear Automotive Service Equipment Company | Automotive battery test apparatus |
| CN101866758A (en) * | 2010-05-10 | 2010-10-20 | 河南大学 | Evaluation method of photoanode electron transmission performance of dye sensitization solar batteries |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108508067A (en) * | 2018-02-11 | 2018-09-07 | 多氟多（焦作）新能源科技有限公司 | A method of evaluating the battery material of lithium ion battery using Symmetrical cells |
| CN108511815A (en) * | 2018-02-28 | 2018-09-07 | 合肥国轩高科动力能源有限公司 | A kind of evaluation method and system of lithium ion battery consistency |
| CN109346674A (en) * | 2018-09-19 | 2019-02-15 | 惠州亿纬锂能股份有限公司 | A kind of battery pole piece baking method |
| CN109856549A (en) * | 2019-01-18 | 2019-06-07 | 合肥国轩高科动力能源有限公司 | A kind of evaluation method of lithium ion cell electrode loop attenuation mechanism |
| CN109856549B (en) * | 2019-01-18 | 2021-07-13 | 合肥国轩高科动力能源有限公司 | Evaluation method of electrode cycle attenuation mechanism of lithium ion battery |
| CN112687884A (en) * | 2020-12-14 | 2021-04-20 | 风帆有限责任公司 | Lithium battery for testing impedance of battery pole piece in situ and manufacturing method thereof |
| CN116008848A (en) * | 2023-02-03 | 2023-04-25 | 济南大学 | Application of color difference technology in detection of electrode material and electrode plate state of lithium ion battery |
| CN116008848B (en) * | 2023-02-03 | 2024-02-13 | 济南大学 | Application of color difference technology in detection of lithium ion battery electrode material and electrode plate |
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| CN105006597B (en) | 2017-06-27 |
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