CN106970123A - A kind of method for determining lithium ion battery ptc material performance - Google Patents
A kind of method for determining lithium ion battery ptc material performance Download PDFInfo
- Publication number
- CN106970123A CN106970123A CN201610023753.3A CN201610023753A CN106970123A CN 106970123 A CN106970123 A CN 106970123A CN 201610023753 A CN201610023753 A CN 201610023753A CN 106970123 A CN106970123 A CN 106970123A
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- ptc
- lithium ion
- ion battery
- battery
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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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
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
Abstract
The present invention provides a kind of method for determining lithium ion battery ptc material performance, and this method comprises the following steps：1) glass transition temperature of ptc material is measured；2) temperature of PTC effects occurs for measurement PTC combination electrodes；3) resistance of the lithium ion battery of measurement PTC combination electrodes at different temperatures；4) chemical property and security performance of the lithium ion battery of detection PTC combination electrodes.By the measure to material property, the ptc material of suitable lithium ion battery can be accurately selected, to improve the security of lithium-ion energy storage battery.
Description
Technical field
The present invention relates to a kind of assay method of material property, and in particular to a kind of measure lithium ion battery ptc material performance
Method.
Background technology
The security incident of lithium ion battery is more, under being due to the improper service condition such as high current, external short circuit, overheat, overcharge
Trigger the thermal runaway of battery, cause battery catches fire or even blast.The security improved in lithium ion battery use is always lithium ion
The key technical problem of battery research.
PTC (Positive Temperature Coefficient) PTC material refers to the resistance value of material with the rise of temperature
It is held essentially constant or only when a kind of thermo-sensitive material risen, the i.e. resistance or resistivity of material are within the scope of certain certain temperature
There is the change of small quantity.And when temperature reaches some specific knee pointy temperature (Curie temperature) of material nearby, the electricity of material
Resistance rate can undergo mutation within the scope of several years or ten several years narrow temperature, and resistivity increases rapidly the 103-109 orders of magnitude.PTC
The change of thermistor body temperature can be obtained by the electric current for flowing through PTC thermistor, can also by the external world input heat or
The superposition of both persons is obtained.
Suitable ptc material (during being either fabricated to) can be assembled to inside battery or be compound in the electrode interior of battery,
Can the big circuit of battery, short circuit, overcharge etc. cause battery temperature to raise when, reduction flows through the electric current of electrode, plays protection electricity
The effect in pond, meanwhile, the rapidly increase of the internal resistance of cell causes the significant changes of electric terminal voltage, battery management system is started as early as possible
Protection, also functions to the effect of protection battery.Furthermore, ptc material is when temperature change causes internal resistance drastically to change, ptc material
Volume can increase, and inside can absorb the electrolyte outside battery pole piece, be also beneficial to improve the security of battery to a certain extent,
This battery self-excitation safeguard measure based on ptc material has important practical valency to the security for improving lithium-ion energy storage battery
Value, the application of ptc material is one of main direction of studying of recent domestic lithium ion battery safety performance improving environment.
Currently for application study of the ptc material in lithium ion battery, mainly the application process of certain material in the battery with
And the influence after application to battery performance, it is therefore desirable to a kind of method for determining lithium ion battery ptc material property is provided, with
Full and accurate data are provided for the selection of lithium ion battery ptc material, and then improve security.
The content of the invention
The present invention provides a kind of method for determining lithium ion battery ptc material performance, can accurately select suitable by this method
For the ptc material of lithium ion battery, the chemical property of lithium ion battery had both been ensure that, its security performance is improved again.
To achieve the above object, the present invention uses following technical scheme：
A kind of method for determining lithium ion battery ptc material performance, this method comprises the following steps：
1) glass transition temperature of ptc material is measured；
2) temperature of PTC effects occurs for measurement PTC combination electrodes；
3) resistance of the lithium ion battery of measurement PTC combination electrodes at different temperatures；
4) chemical property and security performance of the lithium ion battery of detection PTC combination electrodes.
A kind of the first preferred scheme for determining lithium ion battery with the method for ptc material performance, measures the vitrifying of ptc material
Transition temperature includes：Ptc material is taken, is measured with thermogravimetric analyzer, measurement temperature is room temperature to 200 DEG C, heating rate
For 2-4 DEG C/min, measurement atmosphere is nitrogen.
A kind of measure lithium ion battery the second preferred scheme of the method for ptc material performance, is selected for lithium ion battery
The glass transition temperature range of ptc material is 70-130 DEG C.
A kind of the 3rd preferred scheme for determining lithium ion battery with the method for ptc material performance, measurement PTC combination electrodes occur
The method of the temperature of PTC effects is：
(1) ratio for preparing conductive agent and ptc material in combination electrode, combination electrode is 4:1~9:1, the drying of combination electrode
Temperature is not higher than 70 DEG C；
(2) combination electrode is placed on temperature-changeable probe station, is warming up to 150 DEG C to probe station, heating rate is no more than 5 DEG C
/ min, while starting to warm up, opens the resistance test of four-point probe, electricity of the record combination electrode in temperature-rise period
Resistive and the corresponding temperature of generation PTC effects.
A kind of the 4th preferred scheme for determining lithium ion battery with the method for ptc material performance, measures the lithium of PTC combination electrodes
The method of the resistance of ion battery at different temperatures is：
Battery is tested first, in the AC impedance of room temperature, then to start to warm up, the test temperature after heating since 50 DEG C,
Often raise after 5 DEG C, stand 1 hour, then test the AC impedance of battery, after the completion of test, continue to heat up, highest test
To 150 DEG C.
A kind of measure lithium ion battery is with the 5th preferred scheme of the method for ptc material performance, the not equality of temperature for lithium ion battery
Resistance under degree is at least more than 102 with resistance contrast gained lift-drag ratio at room temperature.
A kind of the 6th preferred scheme for determining lithium ion battery with the method for ptc material performance, electrification is measured using cell tester
Performance and security performance are learned, electrochemical property test content mainly includes：Under cycle performance, battery high-temperature under battery room temperature
Cycle performance, the rate charge-discharge performance of battery, the high/low temperature charge-discharge performance of battery；The security performance test content is main
Including：Overcharge test, short-circuit test, heating test.
Compared with immediate prior art, excellent effect of the invention is as follows：
1. the method that the present invention is provided tentatively can quickly draw the glass transition temperature of the ptc material suitable for lithium ion battery
Degree；
2. by combination electrode occurring the measure of the temperature of PTC effects, it can quickly prepare selection suitable for lithium ion battery
Ptc material；
3. measuring the resistance of PTC combination electrodes at different temperatures by four-point probe, measuring speed is fast, and the degree of accuracy is high；
4. being used for by the ptc material for selecting this method in lithium ion battery, the premise of battery performance can not be influenceed
Under, improve the security that battery is used.
Embodiment
Below in conjunction with embodiment, technical scheme is clearly and completely described, it is clear that described implementation
Example is only a part of embodiment of the invention, rather than whole embodiments.Based on the embodiment in the present invention, the common skill in this area
The every other embodiment that art personnel are obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
A kind of measure lithium ion battery method of ptc material performance, specifically includes following steps：
The glass transition temperature measurement of 1.PTC materials
The ptc material with application potential is mainly the material of high molecular polymerization species, this kind of material in lithium ion battery at present
When occurring glassy transition, when being also that it occurs PTC effects.And for lithium ion battery, it is internal in use
Temperature may reach 70 DEG C, but when battery temperature reaches 130 DEG C, barrier film is started to shrink at, and causes the short circuit of battery, finally
Trigger security incident.Therefore, the ptc material applied in lithium ion battery, its glass transition temperature must be at 70-130 DEG C
Between, it is this both to have can guarantee that the normal of lithium ion battery was used, can occur PTC effects before security incident occurs for battery again,
Cell safety accident is prevented to occur.
Specifically measuring method is：Take 0.1-0.5gPTC materials, measured with thermogravimetric analyzer, measurement temperature be room temperature to 200 DEG C,
Heating rate is 2-4 DEG C/min, and measurement atmosphere is nitrogen.Pass through the thermogravimetric curve of material, you can obtain the glass transition of material
Temperature, for glass transition temperature not in 70-130 DEG C of material, excludes its possibility applied in lithium ion battery.
The temperature survey of PTC effects occurs for 2.PTC combination electrodes
Obtained ptc material will be screened in above-mentioned steps 1 and combination electrode, combination electrode are prepared into conductive agent with lithium ion battery
The mass ratio of middle conductive agent and ptc material is 4:1 or 9:1, the drying temperature of combination electrode is not higher than 70 DEG C, to prevent electricity
PTC effects occur in the drying process for pole, cause the failure of electrode.
The combination electrode made is placed on to the test position on temperature-changeable probe station, 150 DEG C, heating rate are warming up to probe station
No more than 5 DEG C/min, while starting to warm up, the resistance test of four-point probe is opened, record combination electrode was heating up
Resistance variations in journey, and investigate between 70-130 DEG C, combination electrode is either with or without generation PTC effects.For not occurring
The electrode of PTC effects, excludes the possibility that its ptc material is applied in lithium ion battery.
The measurement of the lithium ion battery of 3.PTC combination electrodes resistance at different temperatures
Miscellaneous part (negative pole, barrier film, the electrolysis of obtained PTC combination electrodes and lithium ion battery will be screened in the above method 2
Liquid) lithium ion battery is assembled into, the PTC effects of battery are then tested, and calculate battery in the generation from normal temperature to PTC effects
Lift-drag ratio afterwards.
The lithium ion battery of the combination electrode containing PTC is put into convection oven, the temperature control precision of baking oven used is not less than ±
1 DEG C, the both positive and negative polarity of battery is connected with electrochemical workstation.Battery is tested first, in the AC impedance of room temperature, then to start
Heating, the test temperature after heating is often raised after 5 DEG C since 50 DEG C, stands 1 hour, then tests the exchange resistance of battery
It is anti-, after the completion of test, continue to heat up, highest is tested to 150 DEG C.
The test parameter of AC impedance is：Amplitude 5mV, frequency range 100kHz-1mHz.Record AC impedance under different temperatures
Test result, and by battery occur PTC effects after resistance compared with resistance at room temperature, calculating lift-drag ratio.
For lithium ion battery, occur after PTC effects, lift-drag ratio is higher, and battery is safer, occur security incident angle from battery
Degree considers that lift-drag ratio at least should be more than 102.Do not reach the lithium ion battery of the numerical value for lift-drag ratio, exclude its PTC contained
The possibility that material is applied in lithium ion battery.
4. the performance of lithium ion battery test containing ptc material
By PTC using applied to lithium ion battery, being in order to improve the security performance of battery, but PTC materials are introduced in the battery
After material, if influence whether the chemical property of battery, in addition it is also necessary to test.If the addition of ptc material, hence it is evident that reduce lithium
The chemical property of ion battery, then the material do not possess the value applied in the battery.
Same material system, the lithium ion battery of model of the same race are made, one of which is free of ptc material, a kind of material containing PTC
Material, then tests the chemical property and security performance of battery respectively using cell tester.
Electrochemical property test content mainly includes：The cyclicity under cycle performance (25 DEG C), battery high-temperature under battery room temperature
Energy (55~75 DEG C), the rate charge-discharge performance of battery, the high/low temperature charge-discharge performance of battery, security performance test content is main
Including：Overcharge test, short-circuit test, heating test.
If ptc material add lithium ion battery after, the chemical property of battery is decreased obviously, or battery security performance
Do not improved, then exclude the possibility that the material is applied in lithium ion battery.
The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, and those of ordinary skill in the art should
Understand, the embodiment of the present invention can be modified or equivalent substitution with reference to above-described embodiment, these are without departing from this
Spirit and any modification of scope or equivalent substitution are being applied within pending claims.
Claims (9)
1. a kind of method for determining lithium ion battery ptc material performance, it is characterised in that the described method comprises the following steps：
1) glass transition temperature of ptc material is measured；
2) temperature of PTC effects occurs for measurement PTC combination electrodes；
3) resistance of the lithium ion battery of measurement PTC combination electrodes at different temperatures；
4) chemical property and security performance of the lithium ion battery of detection PTC combination electrodes.
2. a kind of method for determining lithium ion battery ptc material performance according to claim 1, it is characterised in that nitrogen
Atmosphere and with 2-4 DEG C/min heating rates, the glass transition temperature of the ptc material is measured with thermogravimetric analyzer.
3. a kind of method for determining lithium ion battery ptc material performance according to claim 2, it is characterised in that PTC
The glass transition temperature that material is used for the lithium ion battery is 70~130 DEG C.
4. a kind of method for determining lithium ion battery ptc material performance according to claim 1, it is characterised in that institute
Stating the temperature of measurement PTC combination electrode generation PTC effects includes：
(1) combination electrode is prepared：The mass ratio of conductive agent and ptc material is 4:1~9:1 ratio prepares combination electrode, and
Dried below 70 DEG C；
(2) with the heating rate less than 5 DEG C/min, change and the generation PTC effects institute for determining the combination electrode resistance are right
The temperature answered.
5. a kind of method for determining lithium ion battery ptc material performance according to claim 1, it is characterised in that institute
Stating the resistance of the lithium ion battery of measurement PTC combination electrodes at different temperatures includes：With four-point probe, often heat up 5 DEG C,
Measured after standing 1 hour.
6. a kind of method for determining lithium ion battery ptc material performance according to claim 5, it is characterised in that will
Resistance under the different temperatures determines lift-drag ratio with resistance contrast at room temperature.
7. a kind of method for determining lithium ion battery ptc material performance according to claim 6, it is characterised in that use
In the lithium ion battery lift-drag ratio more than 102.
8. a kind of method for determining lithium ion battery ptc material performance according to claim 1, it is characterised in that make
Measuring the chemical property with cell tester includes：The cycle performance under cycle performance, battery high-temperature under battery room temperature,
The rate charge-discharge performance of battery, the high/low temperature charge-discharge performance of battery.
9. a kind of method for determining lithium ion battery ptc material performance according to claim 1, it is characterised in that make
Measuring the security performance with cell tester includes：Overcharge test, short-circuit test, heating test.
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| CN201610023753.3A CN106970123A (en) | 2016-01-14 | 2016-01-14 | A kind of method for determining lithium ion battery ptc material performance |
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| CN201610023753.3A CN106970123A (en) | 2016-01-14 | 2016-01-14 | A kind of method for determining lithium ion battery ptc material performance |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107860674A (en) * | 2017-11-07 | 2018-03-30 | 哈尔滨工业大学 | One kind doping simple appraisal procedure of zirconic acid lanthanum base fuel battery electrolyte proton conductive |
| US10950912B2 (en) | 2017-06-14 | 2021-03-16 | Milwaukee Electric Tool Corporation | Arrangements for inhibiting intrusion into battery pack electrical components |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10950912B2 (en) | 2017-06-14 | 2021-03-16 | Milwaukee Electric Tool Corporation | Arrangements for inhibiting intrusion into battery pack electrical components |
| US11031651B2 (en) | 2017-06-14 | 2021-06-08 | Milwaukee Electric Tool Corporation | Arrangements for inhibiting intrusion into battery pack electrical components |
| US11777151B2 (en) | 2017-06-14 | 2023-10-03 | Milwaukee Electric Tool Corporation | Arrangements for inhibiting intrusion into battery pack electrical components |
| US11916203B2 (en) | 2017-06-14 | 2024-02-27 | Milwaukee Electric Tool Corporation | Arrangements for inhibiting intrusion into battery pack electrical components |
| US11923514B2 (en) | 2017-06-14 | 2024-03-05 | Milwaukee Electric Tool Corporation | Arrangements for inhibiting intrusion into battery pack electrical components |
| CN107860674A (en) * | 2017-11-07 | 2018-03-30 | 哈尔滨工业大学 | One kind doping simple appraisal procedure of zirconic acid lanthanum base fuel battery electrolyte proton conductive |
| CN107860674B (en) * | 2017-11-07 | 2019-12-03 | 哈尔滨工业大学 | A kind of simple appraisal procedure of doping zirconic acid lanthanum base fuel battery electrolyte proton conductive |
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Application publication date: 20170721 |
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