CN108363017A - A kind of retired lithium battery stabilization capability value scaling method of long-time storage - Google Patents
A kind of retired lithium battery stabilization capability value scaling method of long-time storage Download PDFInfo
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- CN108363017A CN108363017A CN201810159730.4A CN201810159730A CN108363017A CN 108363017 A CN108363017 A CN 108363017A CN 201810159730 A CN201810159730 A CN 201810159730A CN 108363017 A CN108363017 A CN 108363017A
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- 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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Abstract
The invention belongs to battery technology fields, provide a kind of retired lithium battery stabilization capability value scaling method of long-time storage.After carrying out visual examination and information collection to the retired lithium battery monomer of long-time storage, small multiplying power activation process is carried out to battery cell.Then room temperature volume test is carried out.Capacity Q data is acquired during room temperature volume test and voltage V data draw charging capacity incremental rate curve dQ/dV V figures.Combined charge incremental capacity plot figure makes the difference the X axis coordinate data corresponding to incremental capacity plot peak-peak in front and back test process, according to the size of difference determine the capability value in this test process whether be retired battery capacity stationary value.This method solve the inaccurate problems of retired lithium battery capacity calibration of the conventional batteries capacity scaling method to long-term storage configuration, have been established using basis for the follow-up retired reliable echelon recycling of cell safety.
Description
Technical field
The invention belongs to battery technology fields, and in particular to a kind of retired lithium battery stabilization capability value of long-time storage
The method of calibration.
Background technology
Environmental pollution and lack of energy are the two large problems of facing mankind.For the dual-pressure of response environment and the energy,
Each state in the whole world is all using utilization new energy as the grand strategy of sustainable development, and in recent years, majority state is all in the world
Using Development of EV as the important channel of energy-saving and emission-reduction.
Power battery is one of core component of electric vehicle, and the performance indicator of power battery directly affects electric vehicle
Overall performance.In order to ensure the traveling and security performance of electric vehicle, after electric automobile during traveling is to certain mileage way,
Just retired lithium battery is replaced.If retired lithium battery without suitably handling, will bring a series of environment and safety to ask
Topic, including occupy a large amount of storage space, cause the problems such as environmental pollution and formation security risk.
Echelon is to solve the problems, such as that difficult this of retired battery improves new thinking, retired battery one using lithium battery
As still remain the capacity of 70-80%.Since power battery of electric motor car is to power battery density, stability etc. has phase
When high standard, retired lithium battery can be used in completely with echelon be not to battery performance requirements very high distributed energy storage,
The fields such as microgrid energy storage, low-speed vehicle.
To how safe and reliable echelon utilizes retired battery methods also in the development test stage in lithium battery industry, so
A large amount of retired lithium battery is in recycling and shelves state at this stage.If retired lithium battery be not used for a long time and
Do not carry out charge and discharge activation process during storage periodically, lithium battery can carry out spontaneous chemical reaction, consume active lithium
Particle generates deposit, is continued growing so as to cause retired lithium battery internal resistance, capacity continues to decay.
After the lithium battery for shelving storage for a long time carries out low current activation activation, lithium battery capacity can obtain centainly
Recovery.But the health status of each retired single lithium battery and retired lithium battery shelve length and the storage of resting period
Environment is different, also can be different so as to cause the Health restoration state of lithium battery and recovery time.In order to ensure to shelve for a long time
The retired lithium battery of storage is during echelon utilizes, the fluctuating change of the capacity of battery not drastically.So needing to measure length
Time shelves the stabilization capability value of the retired lithium battery of storage.It thereby may be ensured that the retired lithium battery safety in storage configuration
Reliable echelon is used in other fields.
Invention content
The purpose of the present invention is to provide a kind of retired lithium batteries of long-time storage configuration to stablize capability value scaling method.
Technical scheme of the present invention：
A kind of retired lithium battery stabilization capability value scaling method of long-time storage, steps are as follows：
Step 1：Under good light condition, the appearance of retired lithium battery monomer is detected with ocular estimate, if any deformation,
Crackle, leakage etc. do not carry out volume test to it；
Step 2：The label on retired lithium battery monomer show is observed, collects the essential information of retired lithium battery monomer, such as
Nominal voltage (Un), nominal capacity (Cn) or nominal energy (Wn) etc.；
Step 3：Activation process, the side of activation process are carried out to the retired lithium battery monomer picked out by appearance detection
Method：
3.1) under 25 DEG C of isoperibol, with 0.01CnElectric current constant-current charge to defined monomer charge cutoff voltage,
Stand 30~60min；
3.2) with 0.01CnElectric current constant-current discharge stands 30~60min to defined monomer discharge cut-off voltage；
3.3) step 3.1)~3.2 are repeated) 3 times；
Step 4：To the retired lithium battery monomer Jing Guo activation process, battery capacity test, electricity are carried out at ambient temperature
Pool capacity weight testing method：
4.1) under 23 DEG C~27 DEG C of isoperibol, with 0.02CnElectric current constant-current charge is electric to defined charge cutoff
Pressure, turns constant-voltage charge, until electric current is down to 0.05CnCut-off stands 60min；
4.2) with 0.02CnElectric current constant-current discharge stands 60min to defined monomer discharge cut-off voltage；
4.3) discharge capacity is calculated；
4.4) step 4.1)~4.3 are repeated), when continuous test result three times it is very poor less than rated value 3%, terminate to try
It tests, takes last result average value three times；
Step 5：In step 4 carries out battery capacity test process, setting battery charging and discharging equipment is with certain sampling
Battery capacity (Q) data and voltage (V) data when the retired lithium battery of frequency sampling charges；By collected capacity (Q) data with
And voltage (V) data carry out differential process, obtain dQ and dV；
Step 6：Using collected voltage (V) data as X-axis data, the ratio of dQ/dV uses height as Y-axis data
After this filtering data processing method is filtered the ratio of dQ/dV, obtaining tool, there are three the chargings of obvious peak value to hold
Measure incremental rate curve (dQ/dV-V) figure；
Step 7：Step 4~step 6 is repeated, battery capacity each time is drawn according to step 5~step 6 and tests phase
Corresponding charging capacity incremental rate curve；
Step 8：It is right to peak-peak institute in charging capacity incremental rate curve figure according to obtained charging capacity incremental rate curve
The X axis coordinate data answered make the difference.In front and back adjacent test process, charging capacity incremental rate curve corresponds to the X-axis electricity of peak-peak
If the difference of pressure data is between 0~30mv, the discharge capacity that last time step 4 measures is exported, is as stored for a long time
Retired lithium battery stabilization capability value.Otherwise, then return to step three.
Beneficial effects of the present invention：If the present invention shelves state in storage for a long time for retired lithium battery, work as ladder
When secondary utilization, it is difficult to detect the stationary value of retired lithium battery residual capacity this problem and propose solution.For further battery
Safe and reliable echelon recycling has been established using basis.
Description of the drawings
Fig. 1 is operational flowchart of the present invention.
Fig. 2 is ferric phosphate lithium cell charging capacity incremental rate curve figure.
Fig. 3 is the charging capacity incremental rate curve figure that front and back five tests obtain.
Specific implementation mode
The invention will be further described in the following with reference to the drawings and specific embodiments, and the present invention uses and shelved storage one
Year retired ferric phosphate lithium cell be research object, in conjunction with flow chart and specific embodiment, the invention will be further described, tool
Body process is as follows：
Step 1：Retired LiFePO4 used batteries group is disassembled, ferric phosphate lithium cell monomer is obtained.Good
Under light condition, with ocular estimate detect dynamic lithium battery monomer appearance, select flawless, without deformation, the battery without leakage into
Row capacity check.
Step 2：By information collection, it is known that this batch of battery is nominal voltage 3.2V, nominal capacity (Cn) be 10Ah phosphorus
Sour lithium iron battery.
Step 3：Activation process, the method for activation process are carried out to the ferric phosphate lithium cell picked out by appearance detection：
A) under 25 DEG C of isoperibol, with 0.1Ah (0.01Cn) provide in electric current constant-current charge to enterprise technology condition
Monomer charge cutoff voltage 3.65V, stand 60min；
b)0.1Ah(0.01Cn) monomer discharge cut-off voltage specified in electric current constant-current discharge to enterprise technology condition
2.7V stands 60min；
C) step a)~b is repeated) 3 times.
Step 4：To the retired dynamic lithium battery monomer Jing Guo activation process, carries out battery capacity at room temperature and test.Battery
Capacity test method：
A. under 25 DEG C ± 2 DEG C of isoperibol, specified in 0.02Cn electric currents constant-current charge to enterprise technology condition
Charge cutoff voltage 3.65V, turns constant-voltage charge, until electric current is down to 0.5Ah (0.05Cn) cut-off, stand 60min；
B. with 0.2Ah (0.02Cn) monomer discharge cut-off voltage specified in electric current constant-current discharge to enterprise technology condition
2.7V stands 60min；
C. discharge capacity is calculated；
D. step a~c five times is repeated, when continuously the very poor of test result obtains 3% less than rated value three times, can be terminated in advance
Experiment takes last result average value three times.
Step 5：In step 4 carries out battery capacity test process, setting battery charging and discharging equipment is with the sampling of 10HZ
Battery capacity (Q) data, voltage (V) data when frequency sampling lithium battery charges.By collected capacity (Q) data and voltage
(V) data carry out differential process, obtain dQ and dV.
Step 6：Using collected voltage (V) data as X-axis data, the ratio of dQ/dV uses height as Y-axis data
After this filtering data processing method is filtered the ratio of dQ/dV, obtaining tool, there are three the chargings of obvious peak value to hold
Incremental rate curve (dQ/dV-V) figure is measured, is as shown in Figure 2 retired ferric phosphate lithium cell charging capacity incremental rate curve figure.This experiment
In, No. II peak is top.
Step 7：Step 4~step 6 experiment experiment is repeated, each primary cell is drawn according to step 5~step 6 and is held
It measures and tries corresponding charging capacity incremental rate curve, be as shown in Figure 3 successively five charging capacity incremental rate curves for measuring drafting
Figure.
Step 8：According to obtained charging capacity incremental rate curve, to peak-peak i.e. II in charging capacity incremental rate curve figure
X axis coordinate data corresponding to number peak make the difference.In this experiment, No. II peak is found in preceding four test process, it is adjacent
The difference of corresponding X-axis voltage data is all higher than 30mv twice, and the corresponding amount of deflection is respectively 53,92,59.The 5th is tested
The charging capacity incremental rate curve that the charging capacity incremental rate curve measured is measured with the 4th, the corresponding X-axis voltage data in No. II peak are inclined
Difference is 3mv, this experiment exports the discharge capacity corresponding to step 4, as 7584mah in the 5th experimental test.
Claims (1)
1. a kind of retired lithium battery of long-time storage stablizes capability value scaling method, which is characterized in that steps are as follows：
Step 1：Under good light condition, the appearance of retired lithium battery monomer is detected with ocular estimate, if any deformation, crackle,
Leakage does not carry out volume test to it；
Step 2：The label on retired lithium battery monomer show is observed, the essential information of retired lithium battery monomer is collected；
Step 3：Activation process, the method for activation process are carried out to the retired lithium battery monomer picked out by appearance detection：
3.1) under 25 DEG C of isoperibol, with 0.01CnElectric current constant-current charge stands 30 to defined monomer charge cutoff voltage
~60min；
3.2) with 0.01CnElectric current constant-current discharge stands 30~60min to defined monomer discharge cut-off voltage；
3.3) step 3.1)~3.2 are repeated) 3 times；
Step 4：To the retired lithium battery monomer Jing Guo activation process, battery capacity test is carried out at ambient temperature, and battery holds
Weight testing method：
4.1) under 23 DEG C~27 DEG C of isoperibol, with 0.02CnElectric current constant-current charge turns perseverance to defined charge cutoff voltage
Pressure charging, until electric current is down to 0.05CnCut-off stands 60min；
4.2) with 0.02CnElectric current constant-current discharge stands 60min to defined monomer discharge cut-off voltage；
4.3) discharge capacity is calculated；
4.4) step 4.1)~4.3 are repeated), when continuous test result three times it is very poor less than rated value 3%, terminate to test,
Take last result average value three times；
Step 5：In step 4 carries out battery capacity test process, setting battery charging and discharging equipment is with certain sample frequency
Battery capacity Q data and voltage V data when sampling retired lithium battery charging；By collected capacity Q data and voltage V data
Differential process is carried out, dQ and dV are obtained；
Step 6：Using collected voltage V data as X-axis data, the ratio of dQ/dV uses gaussian filtering as Y-axis data
After data processing method is filtered the ratio of dQ/dV, obtaining tool, there are three the charging capacity increment of obvious peak value is bent
Line dQ/dV-V figures；
Step 7：Step 4~step 6 is repeated, it is corresponding to draw battery capacity test each time according to step 5~step 6
Charging capacity incremental rate curve；
Step 8：According to obtained charging capacity incremental rate curve, corresponding to peak-peak in charging capacity incremental rate curve figure
X axis coordinate data make the difference；In front and back adjacent test process, charging capacity incremental rate curve corresponds to the X-axis voltage number of peak-peak
If between being in 0~30mv according to its difference, exporting the discharge capacity that last time step 4 measures, that as stores for a long time moves back
Use as a servant the stabilization capability value of lithium battery；Otherwise, then return to step three.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810159730.4A CN108363017B (en) | 2018-02-26 | 2018-02-26 | Method for calibrating stable capacity value of retired lithium battery stored for long time |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109164146A (en) * | 2018-11-12 | 2019-01-08 | 桑顿新能源科技有限公司 | A method of water content is judged by being melted into curve |
| CN110190348A (en) * | 2019-06-11 | 2019-08-30 | 邓丽萍 | A kind of activation method of lithium ion battery |
| CN110501650A (en) * | 2019-07-10 | 2019-11-26 | 广州供电局有限公司 | Battery performance measurement method and device |
| CN110850323A (en) * | 2019-11-29 | 2020-02-28 | 国网河南省电力公司电力科学研究院 | Method and device for evaluating accelerated attenuation of retired ternary lithium battery |
| CN111106402A (en) * | 2020-01-03 | 2020-05-05 | 天能电池集团股份有限公司 | Method for recovering capacity of over-term storage battery |
| CN111693884A (en) * | 2020-06-19 | 2020-09-22 | 北京嘀嘀无限科技发展有限公司 | Battery pack consistency detection method and device, readable storage medium and electronic equipment |
| CN111751732A (en) * | 2020-07-31 | 2020-10-09 | 中国汽车工程研究院股份有限公司 | Electric quantity calculation method based on self-adaptive Gaussian convolution component method |
| CN112255549A (en) * | 2020-09-08 | 2021-01-22 | 广州市香港科大霍英东研究院 | Filtering method, system, device and medium for battery capacity increment |
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| CN105576318A (en) * | 2016-02-23 | 2016-05-11 | 上海电力学院 | Multi-parameter comprehensive determination method for determining consistency of electric automobile retired lithium batteries |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109164146A (en) * | 2018-11-12 | 2019-01-08 | 桑顿新能源科技有限公司 | A method of water content is judged by being melted into curve |
| CN110190348A (en) * | 2019-06-11 | 2019-08-30 | 邓丽萍 | A kind of activation method of lithium ion battery |
| CN110501650A (en) * | 2019-07-10 | 2019-11-26 | 广州供电局有限公司 | Battery performance measurement method and device |
| CN110850323A (en) * | 2019-11-29 | 2020-02-28 | 国网河南省电力公司电力科学研究院 | Method and device for evaluating accelerated attenuation of retired ternary lithium battery |
| CN111106402A (en) * | 2020-01-03 | 2020-05-05 | 天能电池集团股份有限公司 | Method for recovering capacity of over-term storage battery |
| CN111693884A (en) * | 2020-06-19 | 2020-09-22 | 北京嘀嘀无限科技发展有限公司 | Battery pack consistency detection method and device, readable storage medium and electronic equipment |
| CN111751732A (en) * | 2020-07-31 | 2020-10-09 | 中国汽车工程研究院股份有限公司 | Electric quantity calculation method based on self-adaptive Gaussian convolution component method |
| CN111751732B (en) * | 2020-07-31 | 2021-09-28 | 中国汽车工程研究院股份有限公司 | Electric quantity calculation method based on self-adaptive Gaussian convolution integral method |
| CN112255549A (en) * | 2020-09-08 | 2021-01-22 | 广州市香港科大霍英东研究院 | Filtering method, system, device and medium for battery capacity increment |
| CN112255549B (en) * | 2020-09-08 | 2024-03-19 | 广州市香港科大霍英东研究院 | Filtering method, system, device and medium for battery capacity increment |
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