CN106707185B - A kind of flexible packing lithium ion secondary battery performance estimating method - Google Patents

A kind of flexible packing lithium ion secondary battery performance estimating method Download PDF

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Publication number
CN106707185B
CN106707185B CN201611154702.0A CN201611154702A CN106707185B CN 106707185 B CN106707185 B CN 106707185B CN 201611154702 A CN201611154702 A CN 201611154702A CN 106707185 B CN106707185 B CN 106707185B
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electrode
electrochemical
test
battery
battery core
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CN106707185A (en
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成斌
刘刚
贾学恒
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Tianjin Lishen Battery JSCL
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Tianjin Lishen Battery JSCL
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/367Software therefor, e.g. for battery testing using modelling or look-up tables
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/385Arrangements for measuring battery or accumulator variables
    • G01R31/3865Arrangements for measuring battery or accumulator variables related to manufacture, e.g. testing after manufacture
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/389Measuring internal impedance, internal conductance or related variables

Abstract

The present invention relates to a kind of flexible packing lithium ion secondary battery performance estimating method, step is, makes a three electrode battery cores, which includes positive electrode and negative electrode connect with pole group and the reference electrode kept apart by diaphragm with pole group;Three stages carried out electrochemical impedance spectroscopy test before, during and after being divided into three electrode battery cores, per stage passes through connection positive electrode and negative electrode, anode and reference electrode and cathode and reference electrode, battery core entirety, positive electrode and negative electrode electrochemical impedance map are tested respectively: before and after electrochemical property test, by above-mentioned electrode connection mode connection electrode, battery core entirety, positive electrode and negative electrode electrochemical impedance map before and after electrochemical property test are obtained;Stage and electrochemical property test front and back electrochemical impedance map, establish the relational model of manufacturing process spectrum data and chemical property before, during and after analysis chemical conversion.Assessment, screening, optimization new process new system rapidly and efficiently can be achieved in the present invention.

Description

A kind of flexible packing lithium ion secondary battery performance estimating method
Technical field
The invention belongs to cell performance evaluation technical fields, and in particular to a kind of flexible packing lithium ion secondary battery performance is commented Estimate method.
Background technique
The system that lithium ion secondary battery is made of critical materials such as anode, cathode, electrolyte and diaphragms.To individually every A kind of physical and chemical index test of material and its performance are all established by supplier and are contacted.And these materials are in certain work Skill is combined with each other collocation adaptability concertedness under the premise of battery is made can't be provided by supplier, and this is only lithium ion Battery manufacturers more should be paid close attention to and solve the problems, such as.
Result of study have shown electrode and it is electro-hydraulic between the property at interface have vital shadow to battery performance It rings.It is also to be determined by its contact interface that working in coordination between above-mentioned four referred to kind critical material, which acts on the overwhelming majority,.Institute With the accommodating property harmony that the interfacial property of research material from each other is the key that between Knowing material.
There are 3 points of deficiencies for reality.First, the chemical interface research to lithium-ion electric core is mainly finished product battery core, i.e., The manufactured goods after the completion of each process are studied, the research for being directed to different process process in manufacturing process is had ignored;Second, above-mentioned this Kind of research is more to be mixed with positive and negative anodes sum of the two as a result, and not having positive and negative anodes individually separated study tour;Third, The actual test case of manufactured goods mostly come to the assessment of lithium ion battery chemical property at present, and these actual tests Often the time is longer for process, and can not also make microcosmic principle for the superiority and inferiority of actual test and explain.
Summary 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, this method can shorten battery core performance evaluating period long deficiency, while increasing and establishing interfacial property and performance phase The connection of closing property.
To achieve the above object, the present invention adopts the following technical scheme:
A kind of flexible packing lithium ion secondary battery performance estimating method, comprising:
Make a three electrode battery cores, the three electrodes battery core include positive electrode and negative electrode connect with pole group and by diaphragm and Pole group is separated by the reference electrode left;
Before being divided into above-mentioned three electrodes battery core, chemical conversion in and chemical conversion after three phases carry out electrochemical impedance spectroscopy test, Each stage tested respectively by connection positive electrode and negative electrode, anode and reference electrode and cathode and reference electrode battery core it is whole, The electrochemical impedance map of positive electrode and negative electrode:
Electrochemical property test is carried out to the battery core of completion, before and after electrochemical property test, by above-mentioned each stage electricity Pole connection type connection electrode, obtains that battery core before and after electrochemical property test is whole, electrochemical impedance figures of positive electrode and negative electrode Spectrum;
Electrochemical impedance map 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 establishing to the chemical impedance map testing research before and after battery core manufacturing process and electric performance test Correlation between chemical impedance map and chemical property, forming relational model can assessment, screening, optimization rapidly and efficiently New process new system.
Detailed description of the invention
Fig. 1 is the appearance schematic diagram of three electrodes battery core provided by the invention;
Fig. 2 is the structural schematic diagram of reference electrode;
Fig. 3 is the main view after reference electrode is connect with pole group;
Fig. 4 is the top view after reference electrode is connect with pole group;
In figure: 1 is anode, and 2 be cathode, and 3 be reference electrode, and 4 be lithium foil, and 5 be diaphragm, and 6 be pole group, and 10 be battery core.
Specific embodiment
In the following, in conjunction with example, property feature and advantage is further described for the essence of the present invention, 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, comprising the following steps:
A three electrode battery cores 10 are made, which includes pole group 6, the anode 1 connecting with pole group and cathode 2 It is separated by the reference electrode 3 left with by diaphragm 5 and pole group 6;
Before being divided into above-mentioned three electrodes battery core, chemical conversion in and chemical conversion after three phases carry out electrochemical impedance spectroscopy survey Examination, each stage is by connection positive electrode and negative electrode, anode with reference electrode and cathode and reference electrode to test battery core respectively Whole, positive electrode and negative electrode electrochemical impedance maps:
Electrochemical property test is carried out to the battery core of completion, before and after electrochemical property test, by above-mentioned each stage Electrode connection mode connection electrode, obtains that battery core before and after electrochemical property test is whole, the corresponding electrochemistry of positive electrode and negative electrode Impedance spectrum;
Each stage and electrochemical property test front and back electrochemical impedance map, establish manufacturing process before, during and after analysis chemical conversion Spectrum data and chemical property contact.
The present invention is by the above method, each stage and the electrochemistry resistance of electrochemical property test front and back before, during and after analysis chemical conversion Anti- map establishes contacting for manufacturing process spectrum data and chemical property, passes through the above manufacturing process spectrum data and electrification The connection of performance is learned, it can assessment rapidly and efficiently, screening, optimization new process new system.
In the present invention, the reference electrode 3 is including nickel tab 31 and by nickel tab by diaphragm and the partitions subpackage of pole group The metallic lithium foil 4 wrapped up in.
It needs to illustrate to mention, in the present invention, when passing through formation process to three electrode battery cores of the above structure, be divided into before being melted into, Three phases are tested in chemical conversion, after chemical conversion, specific steps are as follows:
Anode 1 is connected first when test every time and cathode 2 tests the electrochemical impedance spectroscopy of battery core entirety;After connect again It connects anode 1 and tests positive electrochemical impedance map with reference electrode 3;After finally connect cathode 2 and the test of reference electrode 3 is negative Pole electrochemical impedance map.The above test will obtain data map.
It completes after the electrochemical impedance map of battery core to be test to its chemical property in next step, chemical property The front and back of test, by the test method of above-mentioned electrochemical impedance spectroscopy be sequentially completed connection anode 1 and cathode 2, connection anode 1 with Reference electrode 3, connection cathode 2 and reference electrode 3, carry out the test of electrochemical impedance map.The above test will obtain data map.
By the parsing to corresponding map, before, during and after induction and conclusion between each chemical conversion stage and performance test spectrogram change Law solidifies the zone of reasonableness of each stage all data before, during and after chemical conversion, so that it may for the quick of new process new system Screening and optimizing provides data and supports, is also the searching bottleneck of properties test and improvement direction.
The present invention constructs itself and electricity by obtaining the parsing of map to test before and after above-mentioned formation process and performance test Assessment, screening rapidly and efficiently are made in the correlation of chemical property, the influence for the change of new process new system to battery core performance And optimization.The corresponding map in the front and back of analysis feature test simultaneously judges influence of every test to positive and negative anodes interface, to there is rule The searching of rule and the direction for selecting performance boost.
The present invention is suitable for before and after cell fabrication processes and performance test, by positive and negative anodes surface electrochemistry property Test simulation establishes the relationship with its chemical property, quickly to assess, screen, optimize new process new system.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered 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, which comprises the following steps:
Make a three electrode battery cores, which includes positive electrode and negative electrode connect with pole group and by diaphragm and pole group It is separated by the reference electrode left;
Before being divided into above-mentioned three electrodes battery core, chemical conversion in and chemical conversion after three phases carry out electrochemical impedance spectroscopy test, it is each Stage is by connection positive electrode and negative electrode, anode with reference electrode and cathode and reference electrode to test battery core entirety, anode respectively With the electrochemical impedance map of cathode:
Electrochemical property test is carried out to the battery core of completion, before and after electrochemical property test, is connected by above-mentioned each stage electrode Mode connection electrode is connect, obtains that battery core before and after electrochemical property test is whole, electrochemical impedance maps of positive electrode and negative electrode;
Electrochemical impedance map before, during and after analysis chemical conversion before and after each stage and electrochemical property test, establishes 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, which is characterized in that the reference electrode Including nickel tab and by nickel tab by the metallic lithium foil of diaphragm and pole group spaced portions package.
CN201611154702.0A 2016-12-14 2016-12-14 A kind of flexible packing lithium ion secondary battery performance estimating method Active CN106707185B (en)

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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

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US10379168B2 (en) * 2007-07-05 2019-08-13 Battelle Energy Alliance, Llc Apparatuses and methods for testing electrochemical cells by measuring frequency response
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CN102608539B (en) * 2012-03-08 2014-05-14 曙鹏科技(深圳)有限公司 Battery electrochemical testing method and device
CN103390770A (en) * 2013-07-25 2013-11-13 天津力神电池股份有限公司 Lithium ion battery formation sectional charging method
US9864012B2 (en) * 2014-02-20 2018-01-09 NOHMs Technologies, Inc. Charge control and termination of lithium sulfur cells and fuel gauging systems and methods
CN105424782B (en) * 2015-12-22 2018-01-30 湖北金洋冶金股份有限公司 Lead powder chemical property detection method and its test system based on small pole plate
CN106093785B (en) * 2016-06-07 2019-01-18 华中科技大学 A kind of lead-acid battery electrochemical property test method
CN205692931U (en) * 2016-06-21 2016-11-16 芜湖格利特新能源科技有限公司 A kind of battery core safety monitoring device of external reference electrode
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