CN109358234A - A kind of pole piece resistance conductivity test method - Google Patents
A kind of pole piece resistance conductivity test method Download PDFInfo
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- CN109358234A CN109358234A CN201811150086.0A CN201811150086A CN109358234A CN 109358234 A CN109358234 A CN 109358234A CN 201811150086 A CN201811150086 A CN 201811150086A CN 109358234 A CN109358234 A CN 109358234A
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- 238000010998 test method Methods 0.000 title claims abstract description 18
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- 238000000034 method Methods 0.000 claims abstract description 18
- 238000004826 seaming Methods 0.000 claims description 20
- 238000005259 measurement Methods 0.000 claims description 12
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- 239000011248 coating agent Substances 0.000 description 5
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- 230000004048 modification Effects 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 239000006258 conductive agent Substances 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
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- 235000009566 rice Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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Abstract
The invention discloses a kind of pole piece resistance conductivity test methods, its method includes: under the same position of pole piece resistance to be measured, it is tested using N number of different positive pressure intensity parameters, to obtain N number of first relative time that test resistance value of the pole piece resistance to be measured under each positive pressure intensity parameter tends towards stability；The second relative time that the maximum value of N number of first relative time of acquisition is tended towards stability jointly as pole piece resistance to be measured；M conductivity value of the pole piece resistance to be measured under different positive pressure intensity parameters is acquired according to M different positive pressure intensity parameters and the second relative time in same position；Best electrical conductivity and its corresponding positive pressure intensity parameter of reference under being obtained in the position according to M conductivity value；Pole piece resistance to be measured is acquired in the conductivity of different location, calculates the RSD% of conductivity under different location according to reference forward direction pressure intensity parameter and the second relative time in different location.Based on the present invention, the RSD% of the conductivity of different location can be measured.
Description
Technical field
The present invention relates to pole piece technique application field more particularly to a kind of pole piece resistance conductivity test methods.
Background technique
In lithium ion battery charge and discharge process, there are the transmission of lithium ion and electronics inside battery pole piece, wherein lithium ion
By the electrolyte transmission filled in electrode hole, and electronics mainly passes through solid particle, the especially three-dimensional of conductive agent composition
Network, which is conducted to active material particle or electrolyte interface, participates in electrode reaction；The transport properties of electronics influence greatly battery performance,
The main high rate performance for influencing battery；And in battery pole piece, the principal element for influencing conductivity includes the knot of paper tinsel base material and coating
Close interface conditions, conductive agent distribution, the contact condition etc. between particle；It can be judged by the conductivity of battery pole piece
The uniformity of microstructure in pole piece resistance, predicts the performance of battery.
Be disclosed in the prior art solve relevant issues resistance meter (patent publication No.:
CN204903649U. pole piece thereof resistance meter), mainly obtained by being tested under different positive pressure intensity parameters
Resistance average value and pole piece thickness average value are taken, belongs to the resistivity under the different pressure intensity parameters of calculating as in pole piece process
One kind, but the displosure file content can not measure best electrical conductivity and best electrical conductivity is corresponding with reference to positive pressure
Parameter does not measure the RSD% of the conductivity of different location yet.
Summary of the invention
The embodiment of the present invention provides a kind of pole piece resistance conductivity test method, can measure best electrical conductivity and best
Conductivity is corresponding with reference to positive pressure intensity parameter, and obtains the RSD% of the accurate conductivity of different location.
The invention discloses a kind of pole piece resistance conductivity test methods, which comprises
S1: it under the same position of pole piece resistance to be measured, is tested using N number of different positive pressure intensity parameters, to obtain
N number of first relative time that test resistance value of the pole piece resistance to be measured under each positive pressure intensity parameter tends towards stability；Its
In, for each positive pressure intensity parameter, acquire the test resistance value of the pole piece resistance to be measured at predetermined time intervals, and according to
Multiple test resistance values of acquisition obtain the first relative time that test resistance value tends towards stability；
S2: the maximum value of N number of first relative time of acquisition is tended towards stability jointly as the pole piece resistance to be measured
Second relative time；
S3: in same position, according to M different positive pressure intensity parameters and second relative time, described in acquisition
M conductivity value of the pole piece resistance to be measured under different positive pressure intensity parameters；It is obtained according to the M conductivity value in the position
Best electrical conductivity under setting and corresponding with the best electrical conductivity refer to positive pressure intensity parameter；
S4: it is acquired described to be measured in different location according to described with reference to positive pressure intensity parameter and the second relative time
Pole piece resistance different location conductivity value, to calculate the RSD% of the conductivity under different location.
Preferably, the predetermined time described in step S1 is 100ms；The test resistance value is the internal resistance of impedance instrument
The sum of R1, the all-in resistance R2 of upper push-down head and pole piece resistance R3 three.
Preferably, described for each positive pressure intensity parameter, the survey of the pole piece resistance to be measured is acquired at predetermined time intervals
Resistance value is tried, and obtains the first relative time that test resistance value tends towards stability according to multiple test resistance values of acquisition, specifically
Are as follows:
S10: the all-in resistance R2 of push-down head in acquisition, and it is put into pole piece resistance to be measured；
S11: testing under the same positive pressure intensity parameter of same position, acquire a test resistance value every 100ms, and
Obtained test resistance value is associated with relative time；
S12: the difference of current test resistance value Yu previous test resistance value is calculated；
S13: if gained difference is less than threshold value, it will be set as current with the current associated relative time of test resistance value
The first relative time under positive pressure intensity parameter, otherwise return step S12.
Preferably, the S3 step specifically:
S30: in same position, with M different positive pressure intensity parameter recursion test；
S31: the all-in resistance R2 of push-down head in acquisition is put into pole piece resistance test；
S32: under each positive pressure intensity parameter, obtaining the resistance value acquired when reaching the second relative time and thickness value,
Corresponding conductivity is calculated simultaneously, to obtain the conductivity data under current positive pressure intensity parameter；
S33: judge whether M different positive pressure intensity parameters are completed；If so, executing step S34；If it is not, then continuing
Next step S35；
S34: best electrical conductivity and the corresponding reference that the position is found out in one group of M conductivity data are positive
Pressure intensity parameter；
S35: positive pressure intensity parameter is replaced, and returns to S31.
Preferably, the S4 step specifically:
S40: it under Y different location parameter, is tested using the positive pressure intensity parameter of the reference of acquisition；
S41: the all-in resistance R2 of push-down head in acquisition, and it is put into pole piece resistance test；
S42: acquisition resistance value and thickness value when the second relative time to tend towards stability jointly being waited to reach calculate simultaneously
Corresponding conductivity obtains the conductivity data under one group of current location；
S43: judge whether Y different location parameter is completed；If so, executing step S44；If it is not, then continuing next
Step S45；
S44: to one group of Y conductivity data, the RSD% of conductivity is calculated；
S45: replacement location parameter, and return to S42.
Preferably, the method that the internal resistance R1 of the impedance instrument is obtained specifically: the probe of impedance instrument is short
It connects, the resistance value of measurement is exactly the internal resistance R1 of impedance instrument；
The method that the all-in resistance R2 of the upper push-down head is obtained specifically: by the probe of impedance instrument respectively with upper pressure
Head is connected with push-down head, does not place pole piece resistance, seaming chuck and push-down head contact conducting, measurement between seaming chuck and push-down head
Obtain the resistance value R2 of seaming chuck and push-down head；
The method that the resistance value R3 of the pole piece resistance is obtained specifically: pole piece resistance is placed in seaming chuck and pushing
Head between, seaming chuck, which is under pressure, squeezes pole piece resistance, the resistance of read test instrument subtract impedance instrument internal resistance value R1 and
Seaming chuck and the total resistance value R2 of push-down head, can be obtained the resistance R3 of pole piece resistance.
Preferably, seaming chuck and push-down head contact area immobilize.
A kind of pole piece resistance conductivity test method that inventive embodiments provide can be tended to jointly by calculating resistance value
Stable relative time combination best electrical conductivity is corresponding to survey the different location of pole piece resistance with reference to positive pressure intensity parameter
Examination, measures the RSD% of the accurate conductivity of different location.
Detailed description of the invention
It, below will be to attached drawing needed in embodiment in order to illustrate more clearly of technical solution of the present invention
It is briefly described, it should be apparent that, the accompanying drawings in the following description is only one embodiment of the present invention,
Fig. 1 is a kind of general flow chart of pole piece resistance conductivity test method provided in an embodiment of the present invention；
Fig. 2 is the specific flow chart of S1 in Fig. 1；Fig. 3 is the specific flow chart of S3 in Fig. 1；Fig. 4 is the specific of S4 in Fig. 1
Flow chart.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description.Based on the embodiments of the present invention, those of ordinary skill in the art institute without creative efforts
The every other embodiment obtained, shall fall within the protection scope of the present invention.
Referring to Fig. 1, first embodiment of the invention provides a kind of pole piece resistance conductivity test method, comprising:
S1: it under the same position of pole piece resistance to be measured, is tested using N number of different positive pressure intensity parameters, to obtain
N number of first relative time that test resistance value of the pole piece resistance to be measured under each positive pressure intensity parameter tends towards stability；Its
In, for each positive pressure intensity parameter, acquire the test resistance value of the pole piece resistance to be measured at predetermined time intervals, and according to
Multiple test resistance values of acquisition obtain the first relative time that test resistance value tends towards stability；
S2: the maximum value of N number of first relative time of acquisition is tended towards stability jointly as the pole piece resistance to be measured
Second relative time；
S3: in same position, according to M different positive pressure intensity parameters and second relative time, described in acquisition
M conductivity value of the pole piece resistance to be measured under different positive pressure intensity parameters；It is obtained according to the M conductivity value in the position
Best electrical conductivity under setting and corresponding with the best electrical conductivity refer to positive pressure intensity parameter；
S4: it is acquired described to be measured in different location according to described with reference to positive pressure intensity parameter and the second relative time
Pole piece resistance different location conductivity value, to calculate the RSD% of the conductivity under different location.
Wherein, the conductivity is the parameter for describing the flowing complexity of charge in substance, and the mark of conductivityσ
Quasi- unit is Siemens/rice (writes a Chinese character in simplified form and be S/m), is the inverse of electricalresistivityρ, the i.e. ρ of σ=1/；When the cross that 1 Ampere currents passes through object
Section and there are when 1 volt of voltage, the conductance of object is exactly 1S；Siemens is actually equivalent to 1 ampere/volt；If σ is
Conductance (unit of Siemens), I are electric currents, and E is voltage, then: σ=I/E；
In general, the electric current relationship proportional to conductance when voltage remains unchanged, in this direct current circuit；If electric
It leads and doubles, then electric current also doubles；If conductance is reduced to the 1/10 of its initial value, electric current can also become original 1/10.
The present invention obtains best electrical conductivity and its RSD% using the multiple measurement under various states, improves measurement essence
Degree, reduces experimental error, preferably seeks its common physics law, while having studied the physical quantity under its different conditions,
Reliable guarantee is provided for rear research.
The conductivity for the pole piece resistance that the embodiment of the present invention measures affects the resistance of full battery, and to the multiplying power of battery
Performance generates main influence；By measuring pole piece resistance, the uniformity of microstructure in pole piece resistance, pole piece resistance can determine whether
Formula property, material property and the performance for predicting battery；
Further, in battery pole piece, the principal element for influencing conductivity includes the combination interface feelings of paper tinsel base material and coating
Condition, conductive agent substep state, contact condition between particle etc..
Preferably, the predetermined time described in step S1 is 100ms；The test resistance value is the internal resistance of impedance instrument
The sum of R1, the all-in resistance R2 of upper push-down head and pole piece resistance R3 three.
Preferably, described for each positive pressure intensity parameter, the survey of the pole piece resistance to be measured is acquired at predetermined time intervals
Resistance value is tried, and obtains the first relative time that test resistance value tends towards stability according to multiple test resistance values of acquisition, specifically
Are as follows:
S10: the all-in resistance R2 of push-down head in acquisition, and it is put into pole piece resistance to be measured；
S11: testing under the same positive pressure intensity parameter of same position, acquire a test resistance value every 100ms, and
Obtained test resistance value is associated with relative time；
S12: the difference of current test resistance value Yu previous test resistance value is calculated；
S13: if gained difference is less than threshold value, it will be set as current with the current associated relative time of test resistance value
The first relative time under positive pressure intensity parameter, otherwise return step S12.
Specific flow chart is referring to Fig. 2, the step S11 test that collecting quantity is 50 to 200 in the present embodiment
Resistance value, then the difference of these resistance values is compared with threshold value, finally obtain one group of stable relative time；Wherein, described
Multiple test resistances of acquisition ensure that the precision of the first relative time obtained.
Preferably, the S3 step specifically:
S30: in same position, with M different positive pressure intensity parameter recursion test；
S31: the all-in resistance R2 of push-down head in acquisition is put into pole piece resistance test；
S32: under each positive pressure intensity parameter, obtaining the resistance value acquired when reaching the second relative time and thickness value,
Corresponding conductivity is calculated simultaneously, to obtain the conductivity data under current positive pressure intensity parameter；
S33: judge whether M different positive pressure intensity parameters are completed；If so, executing step S34；If it is not, then continuing
Next step S35；
S34: best electrical conductivity and the corresponding reference that the position is found out in one group of M conductivity data are positive
Pressure intensity parameter；
S35: positive pressure intensity parameter is replaced, and returns to S31.
Specific flow chart is referring to Fig. 3, the step S30 starts to survey using pressure intensity parameter M1 at first in the present embodiment
Examination, then obtain R2 and acquire resistance value and thickness value to obtain corresponding conductivity, it tests to all pressure intensity parameters, just obtains
One group of best electrical conductivity and the positive pressure intensity parameter of corresponding reference；Wherein, described M different positive pressure intensity parameter recursion are surveyed
Examination reduces influence due to pressure intensity parameter difference to conductivity and its relative standard deviation RSD%.
Preferably, the S4 step specifically:
S40: it under Y different location parameter, is tested using the positive pressure intensity parameter of the reference of acquisition；
S41: the all-in resistance R2 of push-down head in acquisition, and it is put into pole piece resistance test；
S42: acquisition resistance value and thickness value when the second relative time to tend towards stability jointly being waited to reach calculate simultaneously
Corresponding conductivity obtains the conductivity data under one group of current location；
S43: judge whether Y different location parameter is completed；If so, executing step S44；If it is not, then continuing next
Step S45；
S44: to one group of Y conductivity data, the RSD% of conductivity is calculated；
S45: replacement location parameter, and return to S42.
Specific flow chart is referring to Fig. 4, the step S41 need to only obtain a resistance R2 in the present embodiment, and use
Location parameter Y1 starts to be tested, and tests to all location parameters, just obtains one group of conductivity data and corresponding phase
To standard deviation RSD%；Wherein, described to be tested under Y different location parameter, it reduces due to pressure intensity parameter difference
Influence to conductivity and its relative standard deviation RSD%；
The RSD is relative standard deviation, also known as standard deviation factor, the coefficient of variation, coefficient of alteration etc., by standard deviation
Difference multiplies 100% resulting value, and the precision for analyzing result in examining detection work divided by corresponding average value,
Calculation formula (1) is as follows:
S is standard deviation in formula, is the square root that the quadratic sum of each measurement data deviation subtracts 1 divided by data amount check,
Its contain to individual data deviation square, biggish deviation is highlightedly reflected, so can be illustrated by standard deviation
The dispersion degree of measurement result；X is corresponding average value, be the method by repeatedly measuring obtain one accurately
As a result, the arithmetic mean of instantaneous value of measured data can represent the average level of measurement result totality.
Preferably, the method that the internal resistance R1 of the impedance instrument is obtained specifically: the probe of impedance instrument is short
It connects, the resistance value of measurement is exactly the internal resistance R1 of impedance instrument；
The method that the all-in resistance R2 of the upper push-down head is obtained specifically: by the probe of impedance instrument respectively with upper pressure
Head is connected with push-down head, does not place pole piece resistance, seaming chuck and push-down head contact conducting, measurement between seaming chuck and push-down head
Obtain the resistance value R2 of seaming chuck and push-down head；
The method that the resistance value R3 of the pole piece resistance is obtained specifically: pole piece resistance is placed in seaming chuck and pushing
Head between, seaming chuck, which is under pressure, squeezes pole piece resistance, the resistance of read test instrument subtract impedance instrument internal resistance value R1 and
Seaming chuck and the total resistance value R2 of push-down head, can be obtained the resistance R3 of pole piece resistance.
Preferably, seaming chuck and push-down head contact area immobilize.
Further, the adoptable pole piece resistance instrument of pole piece resistance conductivity test method described in the embodiment of the present invention
It specifically includes: primary coat collector and corresponding diaphragm resistance validity test and can be distinguished, are subsequent technological development
Provide powerful guarantee；Also can be used biplane can pressure control probe electric-resistivity method directly measure pole piece overall resistivity, including probe
Resistance itself, the contact resistance of probe and coating, coating resistance, coating and collector contact resistance, micro- sane level flat surface
Processing guarantees measurement accuracy, has high-precision internal resistance resolution ratio, carries calibration module, and the high conductivity terminal design of high rigidity can provide
Durable test.
In conclusion a kind of pole piece resistance conductivity test method provided in an embodiment of the present invention, it can be by calculating resistance
Difference of the positive pressure intensity parameter of the corresponding reference of the relative time combination best electrical conductivity that value tends towards stability jointly to pole piece resistance
Position is tested, and the RSD% of the accurate conductivity of different location is measured.
Although the invention has been described by way of example and in terms of the preferred embodiments, but it is not for limiting the present invention, any this field
Technical staff without departing from the spirit and scope of the present invention, may be by the methods and technical content of the disclosure above to this
Inventive technique scheme makes possible variation and modification, therefore, anything that does not depart from the technical scheme of the invention, according to this
The technical spirit of invention any simple modifications, equivalents, and modifications to the above embodiments, belong to the technology of the present invention
The protection scope of scheme.The foregoing is merely presently preferred embodiments of the present invention, it is all done according to scope of the present invention patent it is equal
Deng variation and modification, it is all covered by the present invention.
Claims (7)
1. a kind of pole piece resistance conductivity test method characterized by comprising
S1: it under the same position of pole piece resistance to be measured, is tested using N number of different positive pressure intensity parameters, described in obtaining
N number of first relative time that test resistance value of the pole piece resistance to be measured under each positive pressure intensity parameter tends towards stability；Wherein, right
In each positive pressure intensity parameter, the test resistance value of the pole piece resistance to be measured is acquired at predetermined time intervals, and according to acquisition
Multiple test resistance values obtain the first relative time that test resistance value tends towards stability；
S2: second that the maximum value of N number of first relative time of acquisition is tended towards stability jointly as the pole piece resistance to be measured
Relative time；
S3: it is acquired described to be measured in same position according to M different positive pressure intensity parameters and second relative time
M conductivity value of the pole piece resistance under different positive pressure intensity parameters；Under being obtained in the position according to the M conductivity value
Best electrical conductivity and corresponding with the best electrical conductivity refer to positive pressure intensity parameter；
S4: the pole piece electricity to be measured is acquired according to described with reference to positive pressure intensity parameter and the second relative time in different location
The conductivity value in different location is hindered, to calculate the RSD% of the conductivity under different location.
2. pole piece resistance conductivity test method according to claim 1, which is characterized in that pre- timing described in step S1
Between be 100ms；The test resistance value is the all-in resistance R2 and pole piece resistance R3 tri- of the internal resistance R1 of impedance instrument, upper push-down head
The sum of person.
3. pole piece resistance conductivity test method according to claim 2, which is characterized in that described for each positive pressure
Strong parameter acquires the test resistance value of the pole piece resistance to be measured at predetermined time intervals, and according to multiple test resistances of acquisition
Value obtains the first relative time that test resistance value tends towards stability, specifically:
S10: the all-in resistance R2 of push-down head in acquisition, and it is put into pole piece resistance to be measured；
S11: it is tested under the same positive pressure intensity parameter of same position, acquires a test resistance value every 100ms, and will obtain
Test resistance value be associated with relative time；
S12: the difference of current test resistance value Yu previous test resistance value is calculated；
S13: if gained difference is less than threshold value, current positive pressure will be set as with the current associated relative time of test resistance value
The first relative time under strong parameter, otherwise return step S12.
4. pole piece resistance conductivity test method according to claim 1, which is characterized in that the S3 step specifically:
S30: in same position, with M different positive pressure intensity parameter recursion test；
S31: the all-in resistance R2 of push-down head in acquisition is put into pole piece resistance test；
S32: under each positive pressure intensity parameter, the resistance value acquired when reaching the second relative time and thickness value are obtained, simultaneously
Corresponding conductivity is calculated, to obtain the conductivity data under current positive pressure intensity parameter；
S33: judge whether M different positive pressure intensity parameters are completed；If so, executing step S34；If it is not, then continuing next
Step S35；
S34: the best electrical conductivity and the positive pressure ginseng of corresponding reference of the position are found out in one group of M conductivity data
Number；
S35: positive pressure intensity parameter is replaced, and returns to S31.
5. pole piece resistance conductivity test method according to claim 1, which is characterized in that the S4 step specifically:
S40: it under Y different location parameter, is tested using the positive pressure intensity parameter of the reference of acquisition；
S41: the all-in resistance R2 of push-down head in acquisition, and it is put into pole piece resistance test；
S42: acquisition resistance value and thickness value when the second relative time to tend towards stability jointly being waited to reach, while calculating corresponding electricity
Conductance obtains the conductivity data under one group of current location；
S43: judge whether Y different location parameter is completed；If so, executing step S44；If it is not, then continuing next step
S45；
S44: to one group of Y conductivity data, the RSD% of conductivity is calculated；
S45: replacement location parameter, and return to S42.
6. pole piece resistance conductivity test method according to claim 2, which is characterized in that
The method that the internal resistance R1 of the impedance instrument is obtained specifically: be shorted the probe of impedance instrument, the resistance of measurement
Value is exactly the internal resistance R1 of impedance instrument；
The method that the all-in resistance R2 of the upper push-down head is obtained specifically: by the probe of impedance instrument respectively with seaming chuck and under
Pressure head connection, does not place pole piece resistance between seaming chuck and push-down head, seaming chuck and push-down head contact conducting, measurement obtain pressure
The resistance value R2 of head and push-down head；
The method that the resistance value R3 of the pole piece resistance is obtained specifically: by pole piece resistance be placed in seaming chuck and push-down head it
Between, seaming chuck, which is under pressure, squeezes pole piece resistance, the resistance of read test instrument subtract impedance instrument internal resistance value R1 and upper pressure
Head and the total resistance value R2 of push-down head, can be obtained the resistance R3 of pole piece resistance.
7. pole piece resistance conductivity test method according to claim 6, which is characterized in that seaming chuck and push-down head contact
Area immobilizes.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114113228A (en) * | 2021-11-03 | 2022-03-01 | 元能科技（厦门）有限公司 | Method for evaluating coating uniformity of battery pole piece |
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Application publication date: 20190219 |