CN106842066A - The detection method and device of a kind of discharge capacity of the cell - Google Patents
The detection method and device of a kind of discharge capacity of the cell Download PDFInfo
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- CN106842066A CN106842066A CN201710265947.9A CN201710265947A CN106842066A CN 106842066 A CN106842066 A CN 106842066A CN 201710265947 A CN201710265947 A CN 201710265947A CN 106842066 A CN106842066 A CN 106842066A
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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
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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]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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Abstract
The invention discloses the detection method and device of a kind of discharge capacity of the cell.The method includes：Obtain any sample battery corresponding electrochemical AC impedance collection of illustrative plates in the range of the first predeterminated frequency；Target frequency corresponding with the target AC impedance of the sample battery is determined according to the electrochemical AC impedance collection of illustrative plates；The sample battery of acquisition predetermined number corresponding electrochemical AC impedance collection of illustrative plates in the range of the second predeterminated frequency；Record each sample battery AC impedance corresponding with the target frequency in corresponding electrochemical AC impedance collection of illustrative plates；AC impedance and target discharge capacity according to record determine battery to be detected corresponding standard AC impedance value scope of target frequency described in corresponding electrochemical AC impedance collection of illustrative plates.The method that the present invention is provided can improve the accuracy of discharge capacity of the cell detection.
Description
Technical field
The present invention relates to cell art, more particularly to a kind of discharge capacity of the cell detection method and device.
Background technology
With continuing to develop for science and technology, electronic equipment every field in life is widely used.Wherein, electricity
Pond is indispensable important component in electronic equipment.
Discharge capacity is one of important performance indexes of battery, and it refers to the electricity that battery is released under certain condition.It is right
In lithium primary battery, because it is not chargeable, after carrying out discharge capacity test to a certain lithium primary battery, the lithium primary battery is just
It is not reusable.Therefore, before lithium primary battery factory testing, each lithium primary battery can not be carried out discharge capacity test with
Determine its discharge capacity.The discharge capacity detection mode of current lithium primary battery is in some type of lithium primary battery for preparing
In, the sample battery of predetermined number is picked out at random, and discharge capacity test is carried out to sample battery under certain condition, will
Relatively low discharge capacity is used as standard discharge capacity in test result, and using the standard discharge capacity as the type battery at this
Under the conditions of discharge capacity.
Even if however, using discharge capacity relatively low in test result as standard discharge capacity, cannot guarantee that preparation
The discharge capacity of the type battery can entirely reach standard discharge capacity, therefore, lithium primary battery electric discharge in above-mentioned detection method
The qualification rate of capacity is relatively low.Particularly with the medical and military grade field higher to battery performance requirements, above-mentioned detection method
Requirement of these fields for the discharge capacity of lithium primary battery cannot be met.
The content of the invention
The present invention provides the detection method and device of a kind of discharge capacity of the cell, to improve the accurate of battery capacity detection
Property.
In a first aspect, the embodiment of the invention provides a kind of detection method of discharge capacity of the cell, the method includes：
Obtain any sample battery corresponding electrochemical AC impedance collection of illustrative plates in the range of the first predeterminated frequency；
Target corresponding with the target AC impedance of the sample battery is determined according to the electrochemical AC impedance collection of illustrative plates
Frequency；
The sample battery of acquisition predetermined number corresponding electrochemical AC impedance collection of illustrative plates in the range of the second predeterminated frequency；
Record the friendship corresponding with the target frequency in corresponding electrochemical AC impedance collection of illustrative plates of each sample battery
Flow impedance value；
AC impedance and target discharge capacity according to record determine that battery to be detected hinders in corresponding electrochemical ac
The corresponding standard AC impedance value scope of target frequency described in anti-collection of illustrative plates.
Second aspect, the embodiment of the present invention additionally provides a kind of detection means of discharge capacity of the cell, and the device includes：
First collection of illustrative plates acquisition module, for obtaining any sample battery corresponding electrochemistry in the range of the first predeterminated frequency
Ac impedance spectroscopy；
Target frequency determining module, for determining the mesh with the sample battery according to the electrochemical AC impedance collection of illustrative plates
The corresponding target frequency of mark AC impedance；
Second collection of illustrative plates acquisition module, the sample battery for obtaining predetermined number is corresponding in the range of the second predeterminated frequency
Electrochemical AC impedance collection of illustrative plates；
AC impedance logging modle, for recording each sample battery in corresponding electrochemical AC impedance collection of illustrative plates
AC impedance corresponding with the target frequency；
Standard AC impedance value range determination module, determines for the AC impedance and target discharge capacity according to record
Battery to be detected corresponding standard AC impedance value scope of target frequency described in corresponding electrochemical AC impedance collection of illustrative plates.
The present invention is by obtaining any sample battery corresponding electrochemical AC impedance figure in the range of the first predeterminated frequency
Spectrum；Target frequency corresponding with the target AC impedance of sample battery is determined according to electrochemical AC impedance collection of illustrative plates；Obtain default
The sample battery of quantity corresponding electrochemical AC impedance collection of illustrative plates in the range of the second predeterminated frequency；Each sample battery is recorded right
AC impedance corresponding with target frequency in the electrochemical AC impedance collection of illustrative plates answered；According to the AC impedance and target of record
Discharge capacity determines battery to be detected corresponding standard AC impedance of target frequency in corresponding electrochemical AC impedance collection of illustrative plates
Value scope.Solve the problems, such as that the discharge capacity qualification rate of lithium primary battery in current detection method is relatively low, realize electrochemistry
In ac impedance spectroscopy under target frequency corresponding AC impedance as discharge capacity characteristic quantity, by under target frequency
The statistics of corresponding AC impedance and analysis, target is frequently in corresponding electrochemical AC impedance collection of illustrative plates to determine battery to be detected
The corresponding standard AC impedance value scope of rate, and then by standard AC impedance value scope, battery to be detected can be accurately determined
Discharge capacity whether reach target discharge capacity, it is ensured that discharge capacity detection accuracy.
Brief description of the drawings
Fig. 1 is a kind of flow chart of the detection method of the discharge capacity of the cell in the embodiment of the present invention one；
Fig. 2 is the electrochemical AC impedance collection of illustrative plates schematic diagram in the embodiment of the present invention one；
Fig. 3 is a kind of flow chart of the detection method of the discharge capacity of the cell in the embodiment of the present invention two；
Fig. 4 is a kind of structured flowchart of the detection means of the discharge capacity of the cell in the embodiment of the present invention three.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention, rather than limitation of the invention.It also should be noted that, in order to just
Part rather than entire infrastructure related to the present invention is illustrate only in description, accompanying drawing.
Embodiment one
Fig. 1 is a kind of flow chart of the detection method of discharge capacity of the cell that the embodiment of the present invention one is provided, the present embodiment
It is applicable to that discharge capacity of the cell need to be carried out detection case, the method can be held by the detection means of discharge capacity of the cell
OK, the method that the present embodiment is provided specifically includes following steps：
Step 110, any sample battery corresponding electrochemical AC impedance collection of illustrative plates in the range of the first predeterminated frequency of acquisition.
Wherein, electrochemical AC impedance collection of illustrative plates (Electrochemical Impedance Spectroscopy, EIS) can
Obtained by electrochemical AC impedance tester.
Preferably, the electrochemical AC impedance collection of illustrative plates in the present embodiment is the complex plane figure of electrochemical impedance, is also called
Nyquist schemes.Any battery can be obtained in predeterminated frequency by setting predeterminated frequency scope in electrochemical AC impedance tester
In the range of corresponding electrochemical AC impedance collection of illustrative plates.
The electrochemical AC impedance collection of illustrative plates schematic diagram that Fig. 2 is provided for the present embodiment.Transverse axis is the reality of AC impedance in Fig. 2
Portion, the longitudinal axis is the imaginary part of AC impedance, and each point is respectively corresponding AC impedance under different frequency on lines.
It can be seen from electrochemical theory, the internal battery impedance under different frequency included by corresponding AC impedance is not
Together.Wherein, internal battery impedance may include：Ohmic resistance, SEI (solid electrolyte interface, solid state electrolysis
Matter interface) impedance such as membrane impedance, contact resistance, Charge-transfer resistance and diffusion resistance.In such as Fig. 2, positioned at half-round curve starting point
AC impedance Rs be the Ohmic resistance of each material of inside battery measured under high-frequency, positioned at the friendship of half-round curve destination county
Flow impedance value Rt is each internal battery impedance sum in addition to diffusion resistance measured under low frequency.
Preferably, the first predeterminated frequency scope can determine according to the type of sample battery.For a certain type sample battery,
Its at different frequencies corresponding AC impedance change within the specific limits, wherein, AC impedance is bigger, corresponding frequency
Lower, AC impedance is smaller, and corresponding frequency is higher, then can set the first predeterminated frequency scope according to the scope.
Specifically, the type of sample battery may include：Lithium thionyl chloride cell, lithium manganese dioxide cell, lithium fluorocarbon electricity
The type such as pond and lithium ferrous disulfide battery.
Exemplary, the first predeterminated frequency scope may also be configured to the lowest frequency that electrochemical AC impedance tester is allowed
The frequency range that rate is constituted with highest frequency, or 10 millihertzs hereby~100 KHz is set to, it is larger to obtain the sample battery
Corresponding electrochemical AC impedance collection of illustrative plates in frequency range, preferably according to the electrochemical AC impedance collection of illustrative plates to the sample battery
It is analyzed.
Step 120, corresponding with the target AC impedance of sample battery target is determined according to electrochemical AC impedance collection of illustrative plates
Frequency.
Wherein, the AC impedance of battery has a major impact to the discharge capacity of battery, for same type battery, in phase
In the case of discharging condition, the AC impedance of battery is smaller, and discharge capacity is bigger, and the AC impedance of battery is bigger, puts
Capacitance is smaller, therefore, using the AC impedance of battery as discharge capacity of the cell characteristic quantity, by the AC impedance of battery
Value detection discharge capacity of the cell.
Wherein, target AC impedance can be the corresponding AC impedance of optional frequency.
Preferably, due to the internal battery impedance difference that the corresponding AC impedance of different frequency includes, in such as Fig. 2, hand over
Flow impedance value Rs only includes Ohmic resistance, without including other internal battery impedances, therefore, if choosing the AC impedance conduct
The characteristic quantity of discharge capacity, it is impossible to consider influence of other internal battery impedances to discharge capacity.And due to electrochemical ac resistance
AC impedance in anti-collection of illustrative plates positioned at half-round curve destination county is each internal battery impedance sum in addition to diffusion resistance, and
The diffusion resistance of same type battery is more or less the same, therefore, positioned at half-round curve destination county in electrochemical AC impedance collection of illustrative plates
AC impedance can reflect comprehensive internal battery impedance, based on this, preferably by electrochemical AC impedance collection of illustrative plates in the present embodiment
AC impedance positioned at half-round curve destination county is used as target AC impedance.
Wherein, target AC impedance at least includes：Ohmic resistance, SEI membrane impedances, contact resistance and Charge-transfer resistance it
With.
After determining target AC impedance, you can obtain the corresponding target frequency of target AC impedance, then the target is frequently
Rate can be as the optimum frequency for reflecting each impedance value sum in addition to diffusion resistance, by the corresponding AC impedance of the target frequency
It is worth as the characteristic quantity of discharge capacity of the cell.
Step 130, the sample battery corresponding electrochemical ac resistance in the range of the second predeterminated frequency for obtaining predetermined number
Anti- collection of illustrative plates.
Exemplary, predetermined number can be 50,100 or 150.
Wherein, the second predeterminated frequency scope can be identical with the first predeterminated frequency scope, also can be with the first predeterminated frequency scope
It is different.
Preferably, the lower limit frequency value of the second predeterminated frequency scope is target frequency, and upper limit frequency value can be default with first
The upper limit frequency value of frequency range is identical, also can tester's sets itself.Such as the electrochemical AC impedance according to Fig. 2
Collection of illustrative plates, the second predeterminated frequency scope can be the corresponding target frequencies of AC impedance Rt frequency structure corresponding with AC impedance Rs
Into frequency range.
Because during electrochemical AC impedance collection of illustrative plates is obtained, frequency is lower, the acquisition of corresponding AC impedance
Time is more long, by by the lower limit frequency value of the second predeterminated frequency scope for target frequency can greatly reduce acquisition electrochemical ac
The time of impedance spectrum, and then improve the speed of discharge capacity detection.
Step 140, record the friendship corresponding with target frequency in corresponding electrochemical AC impedance collection of illustrative plates of each sample battery
Flow impedance value.
Each sample battery is obtained after corresponding electrochemical AC impedance collection of illustrative plates in the range of the second predeterminated frequency, is recorded respectively
Each sample battery AC impedance corresponding with target frequency in corresponding electrochemical AC impedance collection of illustrative plates.
Step 150, according to record AC impedance and target discharge capacity determine battery to be detected in corresponding electrification
Learn the corresponding standard AC impedance value scope of target frequency in ac impedance spectroscopy.
It is exemplary, can carry out discharge test to each sample battery respectively under the conditions of same test, and from the friendship of record
Discharge capacity reaches the AC impedance of the sample battery of target discharge capacity, Yi Jifang in acquisition discharge test in flow impedance value
The AC impedance of the sample battery of capacitance miss the mark discharge capacity, discharge capacity is reached the sample of target discharge capacity
The AC impedance scope that lowest AC impedance value is constituted with highest AC impedance in the AC impedance of this battery is defined as
Battery to be detected corresponding standard AC impedance value scope of target frequency in corresponding electrochemical AC impedance collection of illustrative plates.
Preferably, the AC impedance in the present embodiment is the value of real part of AC impedance.
After determining standard AC impedance value scope, then the electrochemical AC impedance collection of illustrative plates of any battery to be detected can be obtained,
And determine the AC impedance of the battery to be detected under target frequency whether in standard according to the electrochemical AC impedance collection of illustrative plates
AC impedance scope, if, it is determined that the discharge capacity of the battery to be detected reaches target discharge capacity, otherwise, it determines should
The discharge capacity miss the mark discharge capacity of battery to be detected.
Thus, by the AC impedance and target discharge capacity under each sample battery target frequency, determine that standard is handed over
Flow impedance value scope, and then whether the discharge capacity that can accurately determine battery to be detected by standard AC impedance value scope reach
To target discharge capacity, the accuracy of discharge capacity detection is improved.
The present embodiment is by obtaining any sample battery corresponding electrochemical AC impedance in the range of the first predeterminated frequency
Collection of illustrative plates；Target frequency corresponding with the target AC impedance of sample battery is determined according to electrochemical AC impedance collection of illustrative plates；Obtain pre-
If the sample battery of quantity corresponding electrochemical AC impedance collection of illustrative plates in the range of the second predeterminated frequency；Each sample battery is recorded to exist
AC impedance corresponding with target frequency in corresponding electrochemical AC impedance collection of illustrative plates；According to the AC impedance and mesh of record
Mark discharge capacity determines the corresponding standard AC resistance of battery to be detected target frequency in corresponding electrochemical AC impedance collection of illustrative plates
Anti- value scope.Solve the problems, such as that the discharge capacity qualification rate of lithium primary battery in current detection method is relatively low, realize electrochemistry
In ac impedance spectroscopy under target frequency corresponding AC impedance as discharge capacity characteristic quantity, by under target frequency
The statistics of corresponding AC impedance and analysis, target is frequently in corresponding electrochemical AC impedance collection of illustrative plates to determine battery to be detected
The corresponding standard AC impedance value scope of rate, and then by standard AC impedance value scope, battery to be detected can be accurately determined
Discharge capacity whether reach target discharge capacity, it is ensured that discharge capacity detection accuracy.
Embodiment two
Fig. 3 is a kind of flow chart of the detection method of discharge capacity of the cell that the embodiment of the present invention two is provided, the present embodiment
It is further to be optimized on the basis of above-described embodiment.The method that the present embodiment is provided specifically includes following steps：
Step 201, any sample battery corresponding electrochemical AC impedance collection of illustrative plates in the range of the first predeterminated frequency of acquisition.
Step 202, corresponding with the target AC impedance of sample battery target is determined according to electrochemical AC impedance collection of illustrative plates
Frequency.
Step 203, the sample battery corresponding electrochemical ac resistance in the range of the second predeterminated frequency for obtaining predetermined number
Anti- collection of illustrative plates.
Step 204, record the friendship corresponding with target frequency in corresponding electrochemical AC impedance collection of illustrative plates of each sample battery
Flow impedance value.
The AC impedance of the default AC impedance scope of step 205, basis and record is classified each sample battery.
It is exemplary, preset AC impedance scope can for 0 ohm~50 ohm, 50 ohm~100 ohm ..., 750 Europe
Nurse~800 ohm and more than 800 ohm.
Recording each sample battery AC impedance corresponding with target frequency in corresponding electrochemical AC impedance collection of illustrative plates
After value, according to default AC impedance scope, the AC impedance of record can be classified, so by with record exchange resistance
It is anti-to be worth corresponding sample cell classification.If the AC impedance of a certain sample battery is 30 ohm, then can be by the sample battery
It is divided into 0 ohm~50 ohm one class of default AC impedance scope.
Step 206, under the conditions of same test discharge capacity test is carried out to the sample battery in each sample battery type.
After by each sample cell classification, under the conditions of same test, the sample battery in each sample battery type is entered
Row discharge test is determining the discharge capacity of each sample battery in each sample battery type.
Wherein, same test condition is at least identical discharge current and mutually synthermal, it is to avoid due to discharge current or temperature
The difference of degree, the discharge capacity on each sample battery produces influence.
Step 207, the discharge capacity of the sample battery counted in each sample battery type are not less than target discharge capacity
Ratio.
Wherein, the discharge capacity that target discharge capacity reaches for needed for battery.
After obtaining the discharge capacity of sample battery in each sample battery type, the sample in each sample battery type is counted
The discharge capacity of battery is held not less than the ratio of target discharge capacity with the electric discharge for determining sample battery in each sample battery type
Amount reaches the qualification rate of target discharge capacity.
Step 208, whether the ratio of each sample battery type is judged not less than preset ratio, if so, performing step 209.
Step 209, the corresponding default AC impedance scope of sample battery type that ratio is not less than into preset ratio are true
It is set to battery to be detected corresponding standard AC impedance value scope of target frequency in corresponding electrochemical AC impedance collection of illustrative plates.
Exemplary, preset ratio can be set according to the actual requirements.As used for fields such as medical treatment or military affairs
Battery, preset ratio may be set to 100%.
Exemplary, if 0 ohm~50 ohm, 50 ohm~100 ohm, 100 ohm in default AC impedance scope
The discharge capacity of the sample battery in~150 ohm and 150 ohm~200 ohm is not less than the ratio of target discharge capacity not
Less than preset ratio, the discharge capacity of the sample battery in remaining each default AC impedance scope is not less than target discharge capacity
Ratio be respectively less than preset ratio, then be defined as standard AC impedance value scope by 0 ohm to 200 ohm.
The electrochemical AC impedance collection of illustrative plates of step 210, acquisition battery to be detected in the range of the second predeterminated frequency.
Step 211, judge battery to be detected friendship corresponding with target frequency in corresponding electrochemical AC impedance collection of illustrative plates
Whether flow impedance value is in the range of standard AC impedance value, if so, step 212 is performed, if it is not, performing step 213.
Step 212, determine that the discharge capacity of battery to be detected reaches target discharge capacity.
Step 213, the discharge capacity miss the mark discharge capacity for determining battery to be detected.
Electrochemical AC impedance collection of illustrative plates of the battery to be detected in the range of the second predeterminated frequency is obtained, according to the electrification for obtaining
Learn ac impedance spectroscopy and determine battery to be detected AC impedance corresponding with target frequency in electrochemical AC impedance collection of illustrative plates
And whether the AC impedance is judged in the range of standard AC impedance value, if in the range of standard AC impedance value, really
The discharge capacity of the fixed battery to be detected reaches target discharge capacity, if not in the range of standard AC impedance value, it is determined that
The battery miss the mark discharge capacity to be detected.
Specifically, for a certain size battery, target discharge capacity is 7 MAHs, and any size battery is obtained first
The corresponding electrochemical AC impedance collection of illustrative plates in 1 millihertz hereby~100 KHz frequency, and determine the electrochemical AC impedance collection of illustrative plates
In be located at half-round curve terminal the corresponding frequency of AC impedance be 10 hertz, then randomly select 100 size batteries again,
And each battery corresponding electrochemical AC impedance collection of illustrative plates in 10 hertz~100 KHz frequencies is obtained respectively, record each
Battery 10 hertz of corresponding AC impedances in corresponding electrochemical AC impedance collection of illustrative plates, it is 0 to preset AC impedance scope
Ohm~100 ohm, 100 ohm~200 ohm ..., 800 ohm~900 ohm and more than 1000 ohm, by according to record
AC impedance and default AC impedance scope are classified sample battery, and to the sample electricity in each sample battery type
Pond carries out discharge test in identical discharge current with a temperature of, counts the discharge capacity in each sample battery type and reaches 7 millis
The ratio of ampere-hour, wherein discharge capacity reaches in 0 ohm~100 ohm, 100 ohm~200 ohm and 200 ohm~300 ohm
Ratio to 7 MAHs is 100%, therefore, it is defined as standard AC impedance value scope by 0 ohm~300 ohm；It is random again
The battery to be detected of predetermined number is obtained, and obtains each battery to be detected 10 hertz in corresponding electrochemical AC impedance collection of illustrative plates
Corresponding AC impedance, if the AC impedance is located at 0 ohm~300 ohm, the discharge capacity of the cell to be detected reaches 7
MAH.The battery to be detected that finally pair determination reaches target capacity carries out discharge test to verify testing result again, discharges
Test result determines that all batteries to be detected reach target capacity.Experiment proves that, the method that the present embodiment is provided can be significantly
The accuracy of detection is improved, the field higher to the discharge capacity requirement of battery such as medical treatment or military affairs is applicable to.
The present embodiment is carried out each sample battery by according to the AC impedance of default AC impedance scope and record
Classification, carries out discharge capacity test under the conditions of same test to the sample battery in each sample battery type, counts each sample
Ratio is not less than preset ratio by the discharge capacity of the sample battery in battery type not less than the ratio of target discharge capacity
The corresponding default AC impedance scope of sample battery type is defined as battery to be detected in corresponding electrochemical AC impedance figure
The corresponding standard AC impedance value scope of target frequency in spectrum, realizes correspondence under target frequency in electrochemical AC impedance collection of illustrative plates
AC impedance as discharge capacity characteristic quantity, by the statistics of corresponding AC impedance under target frequency with point
Analysis, determines battery to be detected corresponding standard AC impedance value model of target frequency in corresponding electrochemical AC impedance collection of illustrative plates
Enclose；By obtaining electrochemical AC impedance collection of illustrative plates of the battery to be detected in the range of the second predeterminated frequency, if it is determined that to be detected
Battery in corresponding electrochemical AC impedance collection of illustrative plates AC impedance corresponding with target frequency in standard AC impedance value model
In enclosing, it is determined that the discharge capacity of battery to be detected reaches target discharge capacity, otherwise determines the discharge capacity of battery to be detected
Miss the mark discharge capacity, realizes whether the discharge capacity that battery to be detected is detected by standard AC impedance value scope is reached
To target discharge capacity, it is ensured that the discharge capacity of battery to be detected reaches the accuracy of target discharge capacity detection.
Embodiment three
Fig. 4 is a kind of detection means of discharge capacity of the cell that the embodiment of the present invention three is provided, and the device is applied to need to be right
Battery carries out the situation of discharge capacity detection, the device can by software and or hardware constitute, the device includes：First collection of illustrative plates is obtained
Modulus block 310, target frequency determining module 320, the second collection of illustrative plates acquisition module 330, AC impedance logging modle 340 and standard
AC impedance range determination module 350, wherein,
First collection of illustrative plates acquisition module 310, for obtaining any sample battery corresponding electricity in the range of the first predeterminated frequency
Chemical ac impedance spectroscopy；
Target frequency determining module 320, for being determined and the sample battery according to the electrochemical AC impedance collection of illustrative plates
The corresponding target frequency of target AC impedance；
Second collection of illustrative plates acquisition module 330, the sample battery for obtaining predetermined number is right in the range of the second predeterminated frequency
The electrochemical AC impedance collection of illustrative plates answered；
AC impedance logging modle 340, for recording each sample battery in corresponding electrochemical AC impedance figure
AC impedance corresponding with the target frequency in spectrum；
Standard AC impedance value range determination module 350, for AC impedance and target discharge capacity according to record
Determine battery to be detected corresponding standard AC impedance value model of target frequency described in corresponding electrochemical AC impedance collection of illustrative plates
Enclose.
The present embodiment obtains any sample battery correspondence in the range of the first predeterminated frequency by the first collection of illustrative plates acquisition module
Electrochemical AC impedance collection of illustrative plates；Target frequency determining module determines the mesh with sample battery according to electrochemical AC impedance collection of illustrative plates
The corresponding target frequency of mark AC impedance；Second collection of illustrative plates acquisition module obtains the sample battery of predetermined number in the second predeterminated frequency
In the range of corresponding electrochemical AC impedance collection of illustrative plates；AC impedance logging modle records each sample battery in corresponding electrochemistry
AC impedance corresponding with target frequency in ac impedance spectroscopy；Standard AC impedance value range determination module is according to record
AC impedance and target discharge capacity determine battery to be detected target frequency pair in corresponding electrochemical AC impedance collection of illustrative plates
The standard AC impedance value scope answered, the discharge capacity qualification rate for solving lithium primary battery in current detection method relatively low is asked
Topic, realize using corresponding AC impedance under target frequency in electrochemical AC impedance collection of illustrative plates as discharge capacity characteristic quantity,
By to the statistics of corresponding AC impedance under target frequency and analysis, determining battery to be detected in corresponding electrochemical ac
The corresponding standard AC impedance value scope of target frequency in impedance spectrum, and then by standard AC impedance value scope, can be accurate
Ground determines whether the discharge capacity of battery to be detected reaches target discharge capacity, it is ensured that the accuracy of discharge capacity detection.
In such scheme, optionally, also include：
3rd collection of illustrative plates acquisition module, for obtaining electrochemical ac resistance of the battery to be detected in the range of the second predeterminated frequency
Anti- collection of illustrative plates；
Discharge capacity determining module, for if it is determined that the battery to be detected is in corresponding electrochemical AC impedance collection of illustrative plates
AC impedance corresponding with the target frequency is in the range of the standard AC impedance value, it is determined that the battery to be detected
Discharge capacity reach the target discharge capacity.
In such scheme, optionally, the standard AC impedance value range determination module, including：
Sample cell classification unit, will be each described for the AC impedance according to default AC impedance scope and record
Sample battery is classified；
Discharge capacity test cell, for being carried out to the sample battery in each sample battery type under the conditions of same test
Discharge capacity is tested；
Ration statisticses unit, the discharge capacity for counting the sample battery in each sample battery type is put not less than target
The ratio of capacitance；
Standard AC impedance value scope determining unit, for the sample battery type by the ratio not less than preset ratio
Corresponding default AC impedance scope is defined as battery to be detected target described in corresponding electrochemical AC impedance collection of illustrative plates
The corresponding standard AC impedance value scope of frequency.
In such scheme, optionally, the lower limit frequency value of the second predeterminated frequency scope is target frequency.
In such scheme, optionally, the target AC impedance at least includes：Ohmic resistance, SEI membrane impedances, contact
Resistance and Charge-transfer resistance sum.
Said apparatus can perform the method that any embodiment of the present invention is provided, and possess the execution corresponding function of the above method
Module and beneficial effect.Not ins and outs of detailed description in the present embodiment, reference can be made to any embodiment of the present invention is provided
Method.
Note, above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that
The invention is not restricted to specific embodiment described here, can carry out for a person skilled in the art various obvious changes,
Readjust and substitute without departing from protection scope of the present invention.Therefore, although the present invention is carried out by above example
It is described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept, also
More other Equivalent embodiments can be included, and the scope of the present invention is determined by scope of the appended claims.
Claims (10)
1. a kind of detection method of discharge capacity of the cell, it is characterised in that including：
Obtain any sample battery corresponding electrochemical AC impedance collection of illustrative plates in the range of the first predeterminated frequency；
Target frequency corresponding with the target AC impedance of the sample battery is determined according to the electrochemical AC impedance collection of illustrative plates；
The sample battery of acquisition predetermined number corresponding electrochemical AC impedance collection of illustrative plates in the range of the second predeterminated frequency；
Record the exchange resistance corresponding with the target frequency in corresponding electrochemical AC impedance collection of illustrative plates of each sample battery
Anti- value；
AC impedance and target discharge capacity according to record determine battery to be detected in corresponding electrochemical AC impedance figure
The corresponding standard AC impedance value scope of target frequency described in spectrum.
2. method according to claim 1, it is characterised in that the AC impedance and discharge target according to record holds
Amount determines battery corresponding standard AC impedance value of target frequency described in corresponding electrochemical AC impedance collection of illustrative plates to be detected
After scope, also include：
Obtain electrochemical AC impedance collection of illustrative plates of the battery to be detected in the range of the second predeterminated frequency；
If it is determined that the battery to be detected exchange corresponding with the target frequency in corresponding electrochemical AC impedance collection of illustrative plates
Impedance value is in the range of the standard AC impedance value, it is determined that the discharge capacity of the battery to be detected reaches the target and puts
Capacitance.
3. method according to claim 1, it is characterised in that the AC impedance and discharge target according to record holds
Amount determines battery corresponding standard AC impedance value of target frequency described in corresponding electrochemical AC impedance collection of illustrative plates to be detected
Scope, including：
AC impedance according to default AC impedance scope and record is classified each sample battery；
Discharge capacity test is carried out to the sample battery in each sample battery type under the conditions of same test；
Count the ratio of the discharge capacity not less than target discharge capacity of the sample battery in each sample battery type；
The ratio is defined as not less than the corresponding default AC impedance scope of sample battery type of preset ratio to be checked
Survey battery corresponding standard AC impedance value scope of target frequency described in corresponding electrochemical AC impedance collection of illustrative plates.
4. method according to claim 1, it is characterised in that the lower limit frequency value of the second predeterminated frequency scope is mesh
Mark frequency.
5. method according to claim 1, it is characterised in that the target AC impedance at least includes：Ohmic resistance,
SEI membrane impedances, contact resistance and Charge-transfer resistance sum.
6. a kind of detection means of discharge capacity of the cell, it is characterised in that including：
First collection of illustrative plates acquisition module, for obtaining any sample battery corresponding electrochemical ac in the range of the first predeterminated frequency
Impedance spectrum；
Target frequency determining module, for being determined to be handed over the target of the sample battery according to the electrochemical AC impedance collection of illustrative plates
The corresponding target frequency of flow impedance；
Second collection of illustrative plates acquisition module, for obtaining the sample battery of the predetermined number corresponding electrification in the range of the second predeterminated frequency
Learn ac impedance spectroscopy；
AC impedance logging modle, for record each sample battery in corresponding electrochemical AC impedance collection of illustrative plates with institute
State the corresponding AC impedance of target frequency；
Standard AC impedance value range determination module, it is to be checked for being determined according to the AC impedance and target discharge capacity of record
Survey battery corresponding standard AC impedance value scope of target frequency described in corresponding electrochemical AC impedance collection of illustrative plates.
7. device according to claim 6, it is characterised in that also include：
3rd collection of illustrative plates acquisition module, for obtaining electrochemical AC impedance figure of the battery to be detected in the range of the second predeterminated frequency
Spectrum；
Discharge capacity determining module, for if it is determined that the battery to be detected in corresponding electrochemical AC impedance collection of illustrative plates with institute
The corresponding AC impedance of target frequency is stated in the range of the standard AC impedance value, it is determined that the battery to be detected is put
Capacitance reaches the target discharge capacity.
8. device according to claim 6, it is characterised in that the standard AC impedance value range determination module, including：
Sample cell classification unit, AC impedance scope and the AC impedance for recording are preset by each sample for basis
Battery is classified；
Discharge capacity test cell, for being discharged the sample battery in each sample battery type under the conditions of same test
Volume test；
Ration statisticses unit, the discharge capacity for counting the sample battery in each sample battery type is held not less than discharge target
The ratio of amount；
Standard AC impedance value scope determining unit, for the sample battery type correspondence by the ratio not less than preset ratio
Default AC impedance scope be defined as battery to be detected target frequency described in corresponding electrochemical AC impedance collection of illustrative plates
Corresponding standard AC impedance value scope.
9. device according to claim 6, it is characterised in that the lower limit frequency value of the second predeterminated frequency scope is mesh
Mark frequency.
10. device according to claim 6, it is characterised in that the target AC impedance at least includes：Ohmic resistance,
SEI membrane impedances, contact resistance and Charge-transfer resistance sum.
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