CN114156544A - Method for rapidly determining battery core infiltration time - Google Patents
Method for rapidly determining battery core infiltration time Download PDFInfo
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- CN114156544A CN114156544A CN202111462123.3A CN202111462123A CN114156544A CN 114156544 A CN114156544 A CN 114156544A CN 202111462123 A CN202111462123 A CN 202111462123A CN 114156544 A CN114156544 A CN 114156544A
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000001764 infiltration Methods 0.000 title abstract description 17
- 230000008595 infiltration Effects 0.000 title abstract description 17
- 239000007788 liquid Substances 0.000 claims abstract description 16
- 238000001453 impedance spectrum Methods 0.000 claims abstract description 14
- 238000012360 testing method Methods 0.000 claims abstract description 11
- 238000002347 injection Methods 0.000 claims abstract description 10
- 239000007924 injection Substances 0.000 claims abstract description 10
- 230000008859 change Effects 0.000 claims abstract description 9
- 238000009736 wetting Methods 0.000 claims abstract description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 239000007774 positive electrode material Substances 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- HMDDXIMCDZRSNE-UHFFFAOYSA-N [C].[Si] Chemical compound [C].[Si] HMDDXIMCDZRSNE-UHFFFAOYSA-N 0.000 claims description 2
- 229910002804 graphite Inorganic materials 0.000 claims description 2
- 239000010439 graphite Substances 0.000 claims description 2
- 229910021385 hard carbon Inorganic materials 0.000 claims description 2
- 239000007773 negative electrode material Substances 0.000 claims description 2
- 238000004804 winding Methods 0.000 claims description 2
- 239000003792 electrolyte Substances 0.000 description 11
- 238000002791 soaking Methods 0.000 description 9
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- HFCVPDYCRZVZDF-UHFFFAOYSA-N [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O Chemical group [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O HFCVPDYCRZVZDF-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- 229910021383 artificial graphite Inorganic materials 0.000 description 1
- 239000010406 cathode material Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion 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
- 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)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides a method for rapidly determining the battery core infiltration time, which comprises the following steps: injecting liquid into the battery cell, and standing the battery cell after the liquid injection is completed; testing impedance of the standing battery cell at intervals, and drawing impedance spectrums of the battery cell at different standing times; determining ohmic impedance of the battery cell at different standing times according to the impedance spectrum; and determining the cell wetting time according to the change of the ohmic impedance along with the time. The method for rapidly determining the battery cell infiltration time is a rapid, simple and convenient method, the infiltration time can be accurately determined without destructively disassembling the battery cell, the battery cell can be repeatedly used, the cost is low, the operation is simple, and the accuracy is high.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a method for rapidly determining battery core infiltration time.
Background
After the lithium ion battery is injected with liquid, an infiltration process of electrolyte is needed, and a standing time is needed to be determined. The purpose of standing after liquid injection is to fully soak the electrolyte, the anode and cathode materials of the battery and the diaphragm. The soaking of the electrolyte on the pole piece relates to solid, liquid and gas three-phase contact. When the electrolyte is injected into the core package, the electrolyte is firstly discharged from the air in the pole piece and between the pole pieces, then the electrolyte is attached to the surfaces of the positive and negative active substances, the phenomenon that the electrolyte infiltrates the pole pieces and the electrolyte in the diaphragm reversely infiltrates the pole pieces can occur along with the time continuation, and when the standing time is long to a certain degree, the infiltration of the pole pieces reaches a balanced state under the action of surface tension, and the next charging and discharging activation can be carried out. Therefore, the soaking time after liquid injection is neither too long, which lengthens the process time, nor too short, which prevents the cell interface from reaching a uniform state, and the cell has an interface problem after charging, so that the determination of a proper soaking time is an important step in the battery manufacturing process.
In the production process of the lithium ion battery, in order to determine the infiltration time after the liquid injection of the battery core, a general battery factory can disassemble the battery core which is statically placed for different times after the liquid injection to observe the change of the interface of the battery core, or indirectly judge the infiltration condition through the disassembly condition of the interface after the charge and the discharge of the battery core, the disassembly of the battery core is a destructive experiment, and the cost can be wasted by the disassembly of the battery core while the great effort can be spent.
Disclosure of Invention
In view of this, the present invention is directed to a method for quickly determining a cell soaking time, which is to quickly determine an optimal cell soaking time without damaging or disassembling a cell structure.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method for rapidly determining the cell wetting time comprises the following steps:
(1) injecting liquid into the battery cell, and standing the battery cell after the liquid injection is completed;
(2) respectively at t0、t1、t2……tnTesting impedance of the static battery cell at any moment, and drawing impedance spectrums of the battery cell at different static time;
(3) respectively determining the corresponding ohmic impedance R of the cell according to the impedance spectrum0、R1、R2……Rn；
(4) Determining the battery core infiltration time according to the change of ohmic impedance along with time, wherein the ohmic impedance mainly comprises an electrode material, electrolyte, a diaphragm resistor and contact resistors of parts, the electrolyte slowly infiltrates into the pole piece and the diaphragm along with the change of time after liquid injection, the ohmic impedance can be changed until infiltration is finished, the ohmic impedance can not be changed any more, the infiltration time is determined according to the change of the ohmic impedance along with the time, the method is a quick and simple method, and the standing time when the ohmic impedance is basically not changed is determined as the optimal infiltration time; for example, when R isn+1-Rn≤10-7At Ω, consider tnFor optimal soaking time.
Further, in the step (2), the impedance of the battery cell is tested for the standing time of 10min, 1h, 4h, 6h, 12h, 16h, 20h, 24h and 36 h.
Further, the specific operation method of the step (2) comprises the following steps:
and testing the impedance of the battery cell through an electrochemical workstation, wherein the frequency scanning range of the electrochemical workstation is 0.02-1000Hz, and the amplitude is 5 mV.
Further, the impedance spectrum has the real part of the impedance as the abscissa and the imaginary part of the impedance as the ordinate.
Further, the method for determining ohm impedance in step (3) comprises the following steps:
the intersection part of the impedance curve of the ultrahigh frequency part and the abscissa in the impedance spectrum is the ohmic impedance of the battery core.
Further, the battery cell is a soft-package laminated battery cell or a soft-package winding battery cell.
Further, the positive electrode material of the battery cell comprises one or a mixture of two of ternary and LFP, and the negative electrode material of the battery cell comprises one or a mixture of three of graphite, hard carbon and silicon carbon.
Compared with the prior art, the method for rapidly determining the battery core infiltration time has the following advantages:
the method for rapidly determining the battery cell infiltration time is a rapid, simple and convenient method, the infiltration time can be accurately determined without destructively disassembling the battery cell, the battery cell can be repeatedly used, the cost is low, the operation is simple, and the accuracy is high.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic diagram of an impedance spectrum according to an embodiment of the present invention.
Detailed Description
Unless defined otherwise, technical terms used in the following examples have the same meanings as commonly understood by one of ordinary skill in the art to which the present invention belongs. The test reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the experimental methods are conventional methods unless otherwise specified.
The present invention will be described in detail with reference to the following examples and accompanying drawings.
The battery in the embodiment is manufactured by adopting model 55/140/185-10Ah, and the production process comprises the following steps: homogenizing, coating, rolling, die cutting, laminating, welding, packaging, injecting liquid, standing, and pre-forming, wherein the positive active material of the battery is nickel cobalt lithium manganate, and the negative material is modified artificial graphite.
And vacuumizing and sealing the core bag after liquid injection, and detecting impedance change by adopting a German Zahner electrochemical workstation. The frequency monitoring range of the impedance is 0.02 Hz-1000 Hz, the amplitude is selected to be 5mV, and the detection frequency is as follows: and (3) testing immediately after the liquid injection is finished and the sealing is performed, testing the impedance for one time at an initial interval of 10min, lengthening the interval and monitoring the ohmic impedance change of the battery cell along with the time until the ohmic impedance is almost unchanged, and obtaining the impedance spectrums of the battery cells at different standing times by taking the real part of the impedance as a horizontal coordinate and the imaginary part of the impedance as a vertical coordinate. Fig. 1 is a schematic diagram of an impedance spectrum of an electric core, an intersection part of an impedance curve of an ultrahigh frequency part and an abscissa in the impedance spectrum is ohmic impedance of the electric core, and ohmic impedance data in the diagram are extracted and compared, as shown in table 1:
TABLE 1 results of ohmic impedance testing at different rest times
| Standing time | Ohmic impedance |
| 10min | 0.00089424 |
| 1h | 0.00089175 |
| 4h | 0.00084896 |
| 6h | 0.00081384 |
| 12h | 0.00073386 |
| 16h | 0.00071397 |
| 20h | 0.00071387 |
| 24h | 0.00071297 |
| 36h | 0.00071297 |
The test results in table 1 show that the ohmic impedance becomes smaller and smaller with the increase of the soaking time, and basically does not change after 24 hours, so that the electrolyte can be considered to uniformly permeate between the pole piece and the diaphragm at the moment, the soaking is completed, the battery cell can be charged in the next step, and the optimal soaking time is 24 hours.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. A method for rapidly determining the cell wetting time is characterized by comprising the following steps:
(1) injecting liquid into the battery cell, and standing the battery cell after the liquid injection is completed;
(2) testing impedance of the standing battery cell at intervals, and drawing impedance spectrums of the battery cell at different standing times;
(3) determining ohmic impedance of the battery cell at different standing times according to the impedance spectrum;
(4) and determining the cell wetting time according to the change of the ohmic impedance along with the time.
2. The method of claim 1, wherein: and (2) testing the impedance of the battery cell with standing time of 10min, 1h, 4h, 6h, 12h, 16h, 20h, 24h and 36h respectively.
3. The method of claim 1, wherein the specific operation method of step (2) comprises the steps of:
and testing the impedance of the battery cell through an electrochemical workstation, wherein the frequency scanning range of the electrochemical workstation is 0.02-1000Hz, and the amplitude is 5 mV.
4. The method of claim 1, wherein: the impedance spectrum takes the real part of the impedance as the abscissa and the imaginary part of the impedance as the ordinate.
5. The method of claim 4, wherein the method of determining the ohm impedance in step (3) comprises the steps of:
the intersection part of the impedance curve of the ultrahigh frequency part and the abscissa in the impedance spectrum is the ohmic impedance of the battery core.
6. The method of claim 1, wherein: the battery cell is a soft-package laminated battery cell or a soft-package winding battery cell.
7. The method of claim 1, wherein: the positive electrode material of the battery cell comprises one or a mixture of two of ternary and LFP, and the negative electrode material of the battery cell comprises one or a mixture of three of graphite, hard carbon and silicon carbon.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111462123.3A CN114156544A (en) | 2021-12-02 | 2021-12-02 | Method for rapidly determining battery core infiltration time |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111462123.3A CN114156544A (en) | 2021-12-02 | 2021-12-02 | Method for rapidly determining battery core infiltration time |
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| CN114156544A true CN114156544A (en) | 2022-03-08 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002298925A (en) * | 2001-03-30 | 2002-10-11 | Toyota Motor Corp | Aging method for lithium secondary battery, and manufacturing method for lithium secondary battery including the same |
| CN103721972A (en) * | 2013-12-20 | 2014-04-16 | 天津力神电池股份有限公司 | Method for wetting polymer lithium ion batteries |
| CN107369862A (en) * | 2017-08-04 | 2017-11-21 | 东莞市振华新能源科技有限公司 | A kind of method of testing of lithium ion battery digestion time |
| CN109142451A (en) * | 2018-09-06 | 2019-01-04 | 惠州亿纬锂能股份有限公司 | A kind of wetting velocity appraisal procedure of battery electrolyte |
| CN110333461A (en) * | 2019-05-29 | 2019-10-15 | 合肥国轩高科动力能源有限公司 | Method for representing wettability of electrolyte through tortuosity |
| CN112084627A (en) * | 2020-08-07 | 2020-12-15 | 合肥国轩高科动力能源有限公司 | Method for qualitatively characterizing electrolyte wettability |
| CN112903537A (en) * | 2021-01-26 | 2021-06-04 | 湖北亿纬动力有限公司 | Method for testing battery cell wettability |
| CN113013469A (en) * | 2021-02-19 | 2021-06-22 | 芜湖天弋能源科技有限公司 | Lithium ion battery cell grouping method |
-
2021
- 2021-12-02 CN CN202111462123.3A patent/CN114156544A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002298925A (en) * | 2001-03-30 | 2002-10-11 | Toyota Motor Corp | Aging method for lithium secondary battery, and manufacturing method for lithium secondary battery including the same |
| CN103721972A (en) * | 2013-12-20 | 2014-04-16 | 天津力神电池股份有限公司 | Method for wetting polymer lithium ion batteries |
| CN107369862A (en) * | 2017-08-04 | 2017-11-21 | 东莞市振华新能源科技有限公司 | A kind of method of testing of lithium ion battery digestion time |
| CN109142451A (en) * | 2018-09-06 | 2019-01-04 | 惠州亿纬锂能股份有限公司 | A kind of wetting velocity appraisal procedure of battery electrolyte |
| CN110333461A (en) * | 2019-05-29 | 2019-10-15 | 合肥国轩高科动力能源有限公司 | Method for representing wettability of electrolyte through tortuosity |
| CN112084627A (en) * | 2020-08-07 | 2020-12-15 | 合肥国轩高科动力能源有限公司 | Method for qualitatively characterizing electrolyte wettability |
| CN112903537A (en) * | 2021-01-26 | 2021-06-04 | 湖北亿纬动力有限公司 | Method for testing battery cell wettability |
| CN113013469A (en) * | 2021-02-19 | 2021-06-22 | 芜湖天弋能源科技有限公司 | Lithium ion battery cell grouping method |
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Application publication date: 20220308 |