CN106707185A - Method for evaluating performance of soft packaging lithium-ion secondary battery - Google Patents
Method for evaluating performance of soft packaging lithium-ion secondary battery Download PDFInfo
- Publication number
- CN106707185A CN106707185A CN201611154702.0A CN201611154702A CN106707185A CN 106707185 A CN106707185 A CN 106707185A CN 201611154702 A CN201611154702 A CN 201611154702A CN 106707185 A CN106707185 A CN 106707185A
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- electrode
- battery core
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/367—Software therefor, e.g. for battery testing using modelling or look-up tables
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/3865—Arrangements for measuring battery or accumulator variables related to manufacture, e.g. testing after 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]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
Abstract
The invention relates to a method for evaluating the performance of a soft packaging lithium-ion secondary battery, which comprises the steps of manufacturing a three-electrode battery core, wherein the three-electrode battery core comprises a positive electrode, a negative electrode and a reference electrode, the positive electrode and the negative electrode are connected with a pole group, and the reference electrode is isolated from the pole group; dividing the three-electrode battery core into a front stage, a middle stage and a rear stage so as to perform an electrochemical impedance spectroscopy test, and respectively testing the electrochemical impedance spectroscopy of the overall battery core, the positive electrode and the negative electrode through connecting the positive electrode and the negative electrode, connecting the positive electrode and the reference electrode and connecting the negative electrode and the reference electrode in each stage; connecting the electrodes according to the above electrode connecting mode before and after the electrochemical performance test so as to acquire the electrochemical impedance spectroscopy of the overall battery core, the positive electrode and the negative electrode before and after the electrochemical performance test; and analyzing the electrochemical impedance spectroscopies in the front stage, the middle stage, the rear stage and before and after the electrochemical performance test, and building a relation model of manufacturing process spectroscopy data and the electrochemical performance. According to the method, a quick and efficient new process and new system for evaluation, screening and optimization can be realized.
Description
Technical field
The invention belongs to cell performance evaluation technical field, and in particular to a kind of flexible packing lithium ion secondary battery performance is commented
Estimate method.
Background technology
The system that lithium rechargeable battery is made up of critical materials such as positive pole, negative pole, electrolyte and barrier films.To individually every
A kind of physical and chemical index test of material and its performance are all established by supplier and contacted.And these materials are in certain work
Skill is combined with each other collocation adaptability concertedness on the premise of being made battery can't be provided by supplier, and this is only lithium ion
The problem that battery manufacturers should more be paid close attention to and solve.
Result of study have shown electrode and it is electro-hydraulic between the property at interface have vital shadow to battery performance
Ring.The effect overwhelming majority of working in coordination between the above-mentioned four kinds of critical materials for referring to is also to be determined by its contact interface.Institute
It is the key of the accommodating property harmony between Knowing material with research material interfacial property from each other.
There are 3 points of deficiencies in reality.First, the chemical interface research to lithium-ion electric core is mainly finished product battery core, i.e.,
Manufactured goods after the completion of research each operation, have ignored the research for different process operation in manufacturing process；Second, above-mentioned this
It is more the result for being mixed with both both positive and negative polarities sum to plant research, and does not have the individually separate study tour of both positive and negative polarity；3rd,
Mostly come from the test case of manufactured goods reality to the assessment of lithium ion battery chemical property at present, and these actual tests
Often the time is more long for process, and cannot also make microcosmic principle explanation for the quality of actual test.
The content of the invention
A kind of flexible packing lithium ion secondary battery performance is provided it is an object of the invention to solve above-mentioned technical problem
Appraisal procedure, the method can shorten battery core performance evaluating cycle deficiency long, while increase sets up interfacial property with performance phase
The contact of closing property.
To achieve the above object, the present invention is adopted the following technical scheme that：
A kind of flexible packing lithium ion secondary battery performance estimating method, including：
Make a three electrode battery cores, the three electrodes battery core include the positive pole that be connected with pole group and negative pole and by barrier film and
Pole group is separated by the reference electrode for leaving；
Three phases carry out electrochemical impedance spectroscopy test before being divided into above-mentioned three electrodes battery core, in chemical conversion and after chemical conversion,
Each stage by connect positive pole and negative pole, positive pole and reference electrode and negative pole and reference electrode with test respectively battery core integrally,
The electrochemical impedance collection of illustrative plates of positive pole and negative pole：
Battery core to completing carries out electrochemical property test, before and after electrochemical property test, by above-mentioned each stage electricity
Pole connected mode connection electrode, obtains the electrochemical impedance figure of the battery core entirety, positive pole and negative pole before and after electrochemical property test
Spectrum；
Electrochemical impedance collection of illustrative plates before, during and after analysis chemical conversion before and after each stage and electrochemical property test, foundation made
The relational model of journey spectrum data and chemical property.
The present invention is by the chemical impedance collection of illustrative plates testing research before and after battery core manufacturing process and electric performance test, setting up
Correlation between chemical impedance collection of illustrative plates and chemical property, forms assessment, screening, optimization that relational model can rapidly and efficiently
New technology new system.
Brief description of the drawings
Fig. 1 is the appearance schematic diagram of the three electrode battery cores that the present invention is provided；
Fig. 2 is the structural representation of reference electrode；
Fig. 3 is the front view after reference electrode is connected with pole group；
Fig. 4 is the top view after reference electrode is connected with pole group；
In figure：1 is positive pole, and 2 is negative pole, and 3 is reference electrode, and 4 is lithium paper tinsel, and 5 is barrier film, and 6 is pole group, and 10 is battery core.
Specific embodiment
Below, substantive distinguishing features of the invention and advantage are further described with reference to example, but the present invention not office
It is limited to listed embodiment.
Referring to shown in Fig. 1-4, a kind of flexible packing lithium ion secondary battery performance estimating method is comprised the following steps：
A three electrode battery cores 10 are made, the three electrodes battery core includes the positive pole 1 and negative pole 2 that pole group 6 and pole group are connected
It is separated by the reference electrode 3 for leaving with by barrier film 5 and pole group 6；
Three phases carry out electrochemical impedance spectroscopy survey before being divided into above-mentioned three electrodes battery core, in chemical conversion and after chemical conversion
Examination, each stage is by connecting positive pole and negative pole, positive pole and reference electrode and negative pole and reference electrode to test battery core respectively
The electrochemical impedance collection of illustrative plates of overall, positive pole and negative pole：
Battery core to completing carries out electrochemical property test, before and after electrochemical property test, by above-mentioned each stage
Electrode connection mode connection electrode, obtains battery core entirety, the positive pole electrochemistry corresponding with negative pole before and after electrochemical property test
Impedance spectrum；
Electrochemical impedance collection of illustrative plates before and after each stage and electrochemical property test, sets up manufacturing process before, during and after analysis chemical conversion
Spectrum data is contacted with chemical property.
The present invention by the above method, electrochemistry resistance before and after each stage and electrochemical property test before, during and after analysis chemical conversion
Anti- collection of illustrative plates, sets up contacting for manufacturing process spectrum data and chemical property, by above manufacturing process spectrum data and electrification
The contact of performance is learned, assessment, screening, optimization new technology new system that can be rapidly and efficiently.
In the present invention, the reference electrode 3 includes nickel lug 31 and by nickel lug by barrier film and pole group partitions subpackage
The metallic lithium foil 4 wrapped up in.
Explanation is needed to carry, in the present invention, when the three electrode battery cores to above structure pass through formation process, be divided into before being melted into,
Three phases are tested in chemical conversion, after chemical conversion, and specific step is as follows：
Connect positive pole 1 and the test battery core of negative pole 2 overall electrochemical impedance spectroscopy during test first every time；Connect again after end
Connect positive pole 1 and test positive pole electrochemical impedance collection of illustrative plates with reference electrode 3；Last connection negative pole 2 is negative with the test of reference electrode 3 after end
Pole electrochemical impedance collection of illustrative plates.Test above will obtain the data collection of illustrative plates of form 1.
Next step will be the test to its chemical property after the electrochemical impedance collection of illustrative plates of completion battery core, chemical property
That tests is front and rear, and connection positive pole 1 and negative pole 2, connection positive pole 1 and ginseng are sequentially completed by the method for testing of above-mentioned electrochemical impedance spectroscopy
Than electrode 3, connection negative pole 2 and reference electrode 3, electrochemical impedance collection of illustrative plates test is carried out.Test above will obtain the data of form 2
Collection of illustrative plates.
By the parsing to corresponding collection of illustrative plates, each is melted into the change of spectrogram between stage and performance test before, during and after induction and conclusion
Law, the zone of reasonableness of each stage each item data before, during and after solidification chemical conversion, it is possible to quick for new technology new system
Screening and optimizing provides data and supports, also the searching bottleneck for properties test and improvement direction.
Parsing by obtaining collection of illustrative plates to test before and after above-mentioned formation process and performance test of the invention, builds it with electricity
Assessment, screening rapidly and efficiently is made in the correlation of chemical property, the influence changed to battery core performance for new technology new system
And optimization.Corresponding collection of illustrative plates before and after analysis feature test simultaneously, judges that every test aligns the influence of cathode interface, so as to there is rule
The direction of searching and the selection performance boost of rule.
The present invention is applied to before and after cell fabrication processes and performance test, by aligning negative terminal surface electrochemical properties
Test simulation sets up the relation with its chemical property, to quickly assessment, screening, optimization new technology new system.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (2)
1. a kind of flexible packing lithium ion secondary battery performance estimating method, it is characterised in that comprise the following steps：
A three electrode battery cores are made, the three electrodes battery core includes the positive pole being connected with pole group with negative pole and by barrier film and pole group
It is separated by the reference electrode for leaving；
Three phases carry out electrochemical impedance spectroscopy test before being divided into above-mentioned three electrodes battery core, in chemical conversion and after chemical conversion, each
Stage tests battery core entirety, positive pole respectively by connecting positive pole and negative pole, positive pole and reference electrode and negative pole and reference electrode
With the electrochemical impedance collection of illustrative plates of negative pole：
Battery core to completing carries out electrochemical property test, before and after electrochemical property test, connects by above-mentioned each stage electrode
Mode connection electrode is connect, the electrochemical impedance collection of illustrative plates of the battery core entirety, positive pole and negative pole before and after electrochemical property test is obtained；
Electrochemical impedance collection of illustrative plates before, during and after analysis chemical conversion before and after each stage and electrochemical property test, sets up manufacturing process figure
The relational model of modal data and chemical property.
2. flexible packing lithium ion secondary battery performance estimating method according to claim 1, it is characterised in that the reference electrode
Including nickel lug and the metallic lithium foil wrapped up by barrier film and pole group spaced portions by nickel lug.
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| CN201611154702.0A CN106707185B (en) | 2016-12-14 | 2016-12-14 | A kind of flexible packing lithium ion secondary battery performance estimating method |
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| CN106707185B CN106707185B (en) | 2019-06-07 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110658469A (en) * | 2019-09-26 | 2020-01-07 | 合肥国轩高科动力能源有限公司 | Method for evaluating exchange current density of lithium ion battery electrode |
| CN113009364A (en) * | 2021-01-29 | 2021-06-22 | 天津市捷威动力工业有限公司 | Method for measuring alternating current impedance of failure battery |
| CN113661398A (en) * | 2018-11-29 | 2021-11-16 | 株式会社Lg新能源 | Cell performance measuring method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113661398A (en) * | 2018-11-29 | 2021-11-16 | 株式会社Lg新能源 | Cell performance measuring method |
| CN110658469A (en) * | 2019-09-26 | 2020-01-07 | 合肥国轩高科动力能源有限公司 | Method for evaluating exchange current density of lithium ion battery electrode |
| CN110658469B (en) * | 2019-09-26 | 2021-10-29 | 合肥国轩高科动力能源有限公司 | Method for evaluating exchange current density of lithium ion battery electrode |
| CN113009364A (en) * | 2021-01-29 | 2021-06-22 | 天津市捷威动力工业有限公司 | Method for measuring alternating current impedance of failure battery |
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| Publication number | Publication date |
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| CN106707185B (en) | 2019-06-07 |
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Effective date of registration: 20230216 Address after: 300000 No.38 Haitai South Road, Huayuan Industrial Zone (outside the ring), High-tech Zone, Binhai New Area, Tianjin Patentee after: Tianjin Juyuan New Energy Technology Co.,Ltd. Address before: 300384 Tianjin Xiqing District Binhai hi tech Industrial Development Zone (outer ring) 38 Haitai South Road Patentee before: TIANJIN LISHEN BATTERY JOINT-STOCK Co.,Ltd. |
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