CN207852740U - A kind of screening system of lithium iron phosphate dynamic battery group self discharge consistency - Google Patents
A kind of screening system of lithium iron phosphate dynamic battery group self discharge consistency Download PDFInfo
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- CN207852740U CN207852740U CN201721215120.9U CN201721215120U CN207852740U CN 207852740 U CN207852740 U CN 207852740U CN 201721215120 U CN201721215120 U CN 201721215120U CN 207852740 U CN207852740 U CN 207852740U
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- battery
- mesuring battary
- consistency
- screening system
- self discharge
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
A kind of screening system of lithium iron phosphate dynamic battery group self discharge consistency, including：High/low temperature explosion-proof tank, for providing high/low temperature experimental situation for each mesuring battary；Cell tester, for carrying out charge-discharge test to battery；Computing device, the data for being obtained according to cell tester calculate each mesuring battary the voltage drop △ V Jing Guo after a certain period of time or the voltage drop K in the unit interval, and sifting sort is carried out to each mesuring battary according to △ V and K value；Marking device, for result of calculation to be attached to mesuring battary by mark mode；Manipulator, for battery similar in consistency to be moved into one group.The screening system of the utility model can carry out low cost, easily operated self discharge conformity classification.
Description
Technical field
This application involves power battery fields, and in particular to a kind of sieve of lithium iron phosphate dynamic battery group self discharge consistency
Select system.
Background technology
Power battery as electric vehicle core energy elements, develop into left and right Development of Electric Vehicles it is crucial because
Element, and lithium iron phosphate dynamic battery is excellent because of the voltage platform of its superior security performance, the cycle life of overlength and stabilization etc.
Performance occupies the staple market of electric automobile power battery.But under existing power battery technology level, electric vehicle must
Requirement must be met using the battery pack that polylith single battery is constituted, this just puies forward the consistency of lithium iron phosphate dynamic battery
Very high requirement is gone out.
Currently, lithium iron phosphate dynamic battery is required for carrying out performance conformity classification to single battery before in groups, it will
The good battery combination of consistency is used at battery pack.The existing method for judging battery consistency predominantly uses static parameter (such as
Voltage, internal resistance, batch etc.) and the mode that is combined of dynamic parameter (such as self discharge, charging constant current ratio) carry out combo.Wherein,
Due to the structure of LiFePO 4 material and battery manufacturing process etc., cause the self-discharge rate of ferric phosphate lithium ion battery compared with
It is high.The self-discharge rate screening technique of ferric phosphate lithium cell is mainly characterized with the voltage difference in the unit interval at present, and this method needs
The front and back voltage of self discharge test and time are recorded, to calculate the self-discharge rate of single battery, then self discharge is close or identical
Single battery carry out combo.This method needs more manpower, electric power, not only increases production cost, also extends production
Period.Also, the method mostly uses greatly electric discharge state and shelves to ferric phosphate lithium cell progress self discharge screening, but due to battery
Polarization, all there is rebound in voltage after battery discharge, and the degree of voltage bounce and rate are all different between different batteries, lead
It is very poor to send a telegraph the voltage consistency before tank discharge state is shelved, and shelves rear voltage or even has also bigger than voltage before shelving, that is, occurs
The phenomenon that voltage difference is negative value, therefore there are certain disadvantages for this method for screening battery consistency using electric discharge state voltage difference
End.
Therefore, it is necessary to a kind of screening system of lithium iron phosphate dynamic battery group self discharge consistency is provided, it is low to carry out
Cost, easily operated self discharge conformity classification.
Invention content
In order to overcome disadvantages described above, the technical solution of the utility model as follows at least partly：
A kind of screening system of lithium iron phosphate dynamic battery group self discharge consistency, including：
High/low temperature explosion-proof tank, for providing high/low temperature experimental situation for each mesuring battary；
Cell tester, for carrying out charge-discharge test to battery；
Computing device, the data for being obtained according to cell tester calculate each mesuring battary and pass through certain time
The voltage drop △ V afterwards or voltage drop K in the unit interval carry out sifting sort according to △ V and K value to each mesuring battary；
Marking device, for result of calculation to be attached to mesuring battary by mark mode；
Manipulator, for battery similar in consistency to be moved into one group；
The manipulator is integrated with the marking device.
By using the utility model, thus it is possible to vary ferric phosphate lithium cell is sieved using the voltage difference of electric discharge state in the prior art
It is insufficient existing for the electric discharge, it is more than 3% by going out self-discharge rate first with the voltage difference preliminary screening under relatively low state-of-charge
Ferric phosphate lithium cell, then battery similar in screening self-discharge rate is shelved at high temperature, battery can be improved by being shelved using high temperature
Self-discharge rate effectively shortens and shelves the period, reduces production cost, has comparable Practical significance.
Description of the drawings
Fig. 1 is the structure diagram of the utility model screening system.
Specific implementation mode
Screening system includes：It is huge to inspire confidence in high/low temperature explosion-proof tank (TaiWan, China, ETH-1000-40-CP-AR), MACCOR batteries
Tester (U.S., model 4200：The channel 5V, 10A, 8 and the channel 10V, 5A, 8), computing device, marking device, manipulator,
And multimeter (U.S. fulke, 17B), data collector (Japanese Yokogawa, MX100).
Test power battery sample：1) nominal voltage 3.2V, nominal capacity 10Ah；2) composition of battery:Positive-active material
Material is LiFePO4, negative electrode active material is artificial graphite, and the main component of electrolyte is LiPF6/ EC+DMC+VC+PS, and
Celgard diaphragms；3) size:23mm (thickness) x68mm (width) x88mm (height).
It can be had steps of using the screening technique of Tthe utility model system：
1, select capacity (10Ah ± 5mAh) and internal resistance (<4m Ω) preferable 10 batteries of consistency, it is tested.In room
At temperature (20 ± 2) DEG C, using constant-current constant-voltage charging system and constant-current discharge system, i.e., by mesuring battary under the conditions of test temperature
With 0.02C current discharges, until cell voltage reaches 2.1V, 1h is stood, then with 0.2C constant-current charges, until cell voltage reaches
Turn constant-voltage charge when 3.65V, until charging current stops charging, such cycle charge-discharge 10 times when being down to 0.02C；
2, under the conditions of room temperature (20 ± 2) DEG C, above-mentioned ferric phosphate lithium cell SOC (state-of-charge) is adjusted to empty electric state, i.e.,
0%SOC (state-of-charge)；
3, under the conditions of room temperature (20 ± 2) DEG C, above-mentioned ferric phosphate lithium cell is shelved 7 days, was surveyed with multimeter every 24 hours
The open-circuit voltage of each single battery is measured, calculates adjacent 24 hours open-circuit voltage difference △ OCU_1, and to 7 days open-circuit voltages
Difference △ OCU_1 carry out linear regression Y=A+BX, choose B>0 single battery (battery 1,2,3,5,6,7,8), as a result such as table
Shown, ferric phosphate lithium cell voltage is denoted as OCU_t1 at this time；
4, above-mentioned ferric phosphate lithium cell is subjected to charging process, i.e., adjusted battery SOC to 10%SOC (state-of-charge)；
5, under 30 DEG C of high temperature, above-mentioned ferric phosphate lithium cell (10%SOC) is shelved 7 days, after measurement battery high-temperature is shelved
Open-circuit voltage OCV_t2；The voltage drop △ V=OCV_t1-OCV_t2 of battery are calculated, it is as shown in the table；
| Battery is numbered | △V |
| 1 | -0.019 |
| 2 | -0.01 |
| 3 | -0.01 |
| 5 | -0.009 |
| 6 | -0.01 |
| 7 | -0.007 |
| 8 | -0.006 |
6, calculate average value X=-0.01 and standard deviation sigma=0.004 of the △ V of all batteries, selection [- 0.018 ,-
0.002] the battery of confidence interval selects battery 2,3,5,6,7,8, these battery self discharge rate consistency preferable.
Here the description and application of the utility model are illustrative, are not wishing to the scope of the utility model being limited in
It states in embodiment.The deformation and change of embodiments disclosed herein are possible, for the ordinary skill people of those this fields
The replacement of embodiment and equivalent various parts are well known for member.It should be appreciated by the person skilled in the art that not taking off
In the case of spirit or essential characteristics from the utility model, the utility model can in other forms, structure, arrangement, ratio,
And it is realized with other components, material and component.It, can be to this in the case where not departing from the scope of the utility model and spirit
In disclosed embodiment carry out other deformations and change.
Claims (1)
1. a kind of screening system of lithium iron phosphate dynamic battery group self discharge consistency, including：
High/low temperature explosion-proof tank, for providing high/low temperature experimental situation for each mesuring battary；
Cell tester, for carrying out charge-discharge test to battery；
Computing device, the data for being obtained according to cell tester calculate each mesuring battary and pass through after a certain period of time
The voltage drop △ V or voltage drop K in the unit interval carry out sifting sort according to △ V and K value to each mesuring battary；
Marking device, for result of calculation to be attached to mesuring battary by mark mode；
Manipulator, for battery similar in consistency to be moved into one group；
Multimeter, the open-circuit voltage for measuring each single battery；
The manipulator is integrated with the marking device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721215120.9U CN207852740U (en) | 2017-09-20 | 2017-09-20 | A kind of screening system of lithium iron phosphate dynamic battery group self discharge consistency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721215120.9U CN207852740U (en) | 2017-09-20 | 2017-09-20 | A kind of screening system of lithium iron phosphate dynamic battery group self discharge consistency |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207852740U true CN207852740U (en) | 2018-09-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721215120.9U Expired - Fee Related CN207852740U (en) | 2017-09-20 | 2017-09-20 | A kind of screening system of lithium iron phosphate dynamic battery group self discharge consistency |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109494412A (en) * | 2018-10-31 | 2019-03-19 | 合肥国轩高科动力能源有限公司 | LFP lithium ion battery cell capacity grading screening method |
| CN110221227A (en) * | 2019-05-31 | 2019-09-10 | 上海动力储能电池系统工程技术有限公司 | Single battery state consistency evaluating method in battery modules |
| CN113238152A (en) * | 2021-05-10 | 2021-08-10 | 昆山聚创新能源科技有限公司 | Lithium battery self-discharge detection method |
| CN118311441A (en) * | 2024-06-07 | 2024-07-09 | 青岛艾诺仪器有限公司 | Power supply control method for adjusting self-discharge test speed of battery and battery test device |
-
2017
- 2017-09-20 CN CN201721215120.9U patent/CN207852740U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109494412A (en) * | 2018-10-31 | 2019-03-19 | 合肥国轩高科动力能源有限公司 | LFP lithium ion battery cell capacity grading screening method |
| CN110221227A (en) * | 2019-05-31 | 2019-09-10 | 上海动力储能电池系统工程技术有限公司 | Single battery state consistency evaluating method in battery modules |
| CN110221227B (en) * | 2019-05-31 | 2022-01-14 | 上海动力储能电池系统工程技术有限公司 | Method for evaluating state consistency of single batteries in battery module |
| CN113238152A (en) * | 2021-05-10 | 2021-08-10 | 昆山聚创新能源科技有限公司 | Lithium battery self-discharge detection method |
| CN118311441A (en) * | 2024-06-07 | 2024-07-09 | 青岛艾诺仪器有限公司 | Power supply control method for adjusting self-discharge test speed of battery and battery test device |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180911 Termination date: 20190920 |
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| CF01 | Termination of patent right due to non-payment of annual fee |