CN108152744A - Self discharge of lithium iron phosphate battery screening technique - Google Patents
Self discharge of lithium iron phosphate battery screening technique Download PDFInfo
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- CN108152744A CN108152744A CN201711316992.9A CN201711316992A CN108152744A CN 108152744 A CN108152744 A CN 108152744A CN 201711316992 A CN201711316992 A CN 201711316992A CN 108152744 A CN108152744 A CN 108152744A
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- battery
- finished battery
- self discharge
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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]
- G01R31/378—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] specially adapted for the type of battery or accumulator
-
- 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
- G01R31/387—Determining ampere-hour charge capacity or SoC
-
- 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]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- 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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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Tests Of Electric Status Of Batteries (AREA)
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention discloses a kind of self discharge of lithium iron phosphate battery screening techniques, it follows these steps to carry out：A, the finished battery encapsulated is taken, 95~100%SOC is charged on charging cabinet；B, the finished battery for having completed charging is placed at ambient temperature, shelves 72~240h and make burin-in process；C, the finished battery through burin-in process, which is sent to again on charging cabinet, makees supplement electricity, charges to 95~100%SOC, obtains charging capacity CO values；D, according to the CO values screening finished battery measured, the finished battery that CO values are more than standard value is self discharge defective work, and the finished battery that CO values are less than or equal to standard value is non-defective unit.The present invention is making self discharge screening close under full electricity or complete full power state, and highly precisely the finished battery of self discharge exception can be screened.Since the present invention substantially increases finished battery screening accuracy and speed, be conducive to improve lithium iron phosphate battery system consistency and reliability, final result is the cycle life for increasing finished battery, saves the equipment investment of user.
Description
Technical field
The present invention relates to a kind of lithium battery quality determining method, in particular it relates to a kind of ferric phosphate lithium cell
Self discharge screening technique, this method belong to power battery technology field.
Background technology
Lithium battery have monomer operating voltage is high, high-energy-density density, have extended cycle life, self discharge is small, memory-less effect,
The features such as environmentally protective, particularly suitable for making great-capacity power battery.Now, the power supply in electric vehicle market and energy storage market
Universal mating lithium battery, it is desirable that mating lithium battery capacity is from more than ten kwh to several Mwh.It is mating for some large scale system demands
Single lithium battery quantity is up to hundreds of or even surpasses ten thousand.In power and energy-storage system, numerous lithium battery groups is connected using in parallel
It connects, therefore the state-of-charge between each group（State of charge, rear abbreviation " SOC "）Coherence request is very high, otherwise shadow
Acoustic system performance reduces cycle life.The initial SOC consistency of lithium battery can be controlled by charge and discharge, and during use
Lithium battery self discharge then influences the SOC consistency between each group.If self discharge is inconsistent, the SOC during use between each group
Consistency will necessarily worse and worse, and such " bucket effect " directly affects entire lithium battery system performance and cycle life.In order to
SOC inconsistence problems between each lithium battery group for avoiding generation in parallel, user usually require that manufacturer provides the lithium screened through SOC
Battery.Prior art screening technique is that lithium battery is fully charged or is discharged to 5~35%SOC, records its voltage value, stores one section
Voltage measurement is carried out after time again and is recorded, then using front and rear voltage value twice as the foundation for selecting self discharge.Lithium battery,
Particularly ferric phosphate lithium cell is during discharge platform, even if capacity declines 30~40%, the voltage drop of generation also very little.Therefore,
Judge that self discharge of lithium iron phosphate battery is unreliable with the mode of voltage drop.
Invention content
Present invention is generally directed to the prior arts to screen the insecure problem of quality, propose a kind of method is easy, screening is quick,
The self discharge of lithium iron phosphate battery screening technique of reliable in quality.
The present invention is achieved through the following technical solutions technical goal.
A kind of self discharge of lithium iron phosphate battery screening technique thes improvement is that and follows these steps to carry out：
A, the finished battery encapsulated is taken, 95~100%SOC is charged on charging cabinet；
B, the finished battery for having completed charging is placed at ambient temperature, shelves 72~240h and make burin-in process；
C, the finished battery through burin-in process, which is sent to again on charging cabinet, makees supplement electricity, charges to 95~100%SOC, is charged
Capacity C O values；
D, according to the CO values screening finished battery measured, CO values are more than the finished battery of standard value for self discharge defective work, CO
Value is non-defective unit less than or equal to the finished battery of standard value.
Scheme as a further improvement, the finished battery charge preferred value as 98~100%SOC on charging cabinet.
Compared with prior art, the present invention it has the positive effect that：
1st, making self discharge screening close under completely electricity or complete full power state, this method is not only easy, time saving, but also improves screening standard
True property since screening operation consumption is work hour saving, significantly reduces manufacture cost；
2nd, the method increase finished batteries to screen precision, is conducive to improve lithium iron phosphate battery system consistency and reliability,
Final result is that cycle life is extended.
Description of the drawings
Fig. 1 is ferric phosphate lithium cell charging characteristic curve.
Specific embodiment
It is further illustrated the present invention below by embodiment.
Self discharge of lithium iron phosphate battery screening technique of the present invention, it follows these steps to carry out：
A, the finished battery encapsulated is taken, 95~100%SOC is charged on charging cabinet；
B, the finished battery for having completed charging is placed at ambient temperature, shelves 72~240h and make burin-in process；
C, the finished battery through burin-in process, which is sent to again on charging cabinet, makees supplement electricity, charges to 95~100%SOC, is charged
Capacity C O values；
D, according to the CO values screening finished product measured, the finished battery that CO values are more than standard value is self discharge defective work, and CO values are small
In or equal to standard value finished battery be non-defective unit.
In order to verify the technique effect of the present invention, 600 50000mAh ferric phosphate lithium cells are selected, are divided into 6 groups, every group
100, wherein first 5 groups are embodiment, last group is comparative example.
Embodiment 1：1st group of 100 ferric phosphate lithium cells are mounted on charging cabinet and charge to 100%SOC, in room temperature item
Aging 168h under part, then charges to 100%SOC by finished battery again, obtains CO1Value.
Embodiment 2：2nd group of 100 ferric phosphate lithium cells are mounted on charging cabinet and charge to 98%SOC, in normal temperature condition
Lower aging 168h, then charges to 98%SOC by finished battery again, obtains CO2Value.
Embodiment 3：3rd group of 100 ferric phosphate lithium cells are mounted on charging cabinet and charge to 95%SOC, in normal temperature condition
Lower aging 168h, then charges to 95%SOC by finished battery again, obtains CO3Value.
Embodiment 4：4th group of 100 ferric phosphate lithium cells are mounted on charging cabinet and charge to 100%SOC, in room temperature item
Aging 72h under part, then charges to 100%SOC by finished battery again, obtains CO4Value.
Embodiment 5：5th group of 100 ferric phosphate lithium cells are mounted on charging cabinet and charge to 100%SOC, in room temperature item
Aging 240h under part, then charges to 100%SOC by finished battery again, obtains CO5Value.
Embodiment 6：6th group of 100 ferric phosphate lithium cells are mounted on charging cabinet and charge to 80%SOC, in normal temperature condition
Lower aging 168h, then charges to 80%SOC by finished battery again, obtains CO6Value.
It measures respectively and records above-described embodiment and the CO values of comparative example, the specific CO values of embodiment 1,2 and 3 are shown in Table 1, real
The CO values for applying example 4,5 and comparative example are shown in Table 2.
The CO value record sheets of 1 embodiment 1,2 and 3 of table
Table 2：Embodiment 4,5 and comparative example CO value record sheets
Illustrate referring to attached drawing 1 and by the data that more than embodiment 1 to embodiment 5 records, using phosphorus of the present invention
Sour lithium iron battery self discharge screening technique is making self discharge screening close under full electricity or complete full power state, can very precisely
Ground screens the finished battery of self discharge exception.And battery is charged into 80%SOC in comparative example, due to being now in phosphorus
The platform area of sour lithium iron battery charging, the accuracy of detection of equipment are not achieved the measurement accuracy to charging capacity C0 values, can generate very
More finished batteries are misjudged.Since the present invention substantially increases finished battery screening accuracy and speed, be conducive to improve ferric phosphate
Lithium battery system consistency and reliability, final result are the cycle life for increasing finished battery, save user in equipment aspect
Investment.
Claims (2)
1. a kind of self discharge of lithium iron phosphate battery screening technique, it is characterised in that follow these steps to carry out：
A, the finished battery encapsulated is taken, 95~100%SOC is charged on charging cabinet；
B, the finished battery for having completed charging is placed at ambient temperature, shelves 72~240h and make burin-in process；
C, the finished battery through burin-in process, which is sent to again on charging cabinet, makees supplement electricity, charges to 95~100%SOC, is charged
Capacity C O values；
D, according to the CO values screening finished battery measured, CO values are more than the finished battery of standard value for self discharge defective work, CO
Value is non-defective unit less than or equal to the finished battery of standard value.
2. self discharge of lithium iron phosphate battery screening technique according to claim 1, it is characterised in that：The finished battery exists
The preferred value that charges on charging cabinet is 98~100%SOC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711316992.9A CN108152744A (en) | 2017-12-12 | 2017-12-12 | Self discharge of lithium iron phosphate battery screening technique |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711316992.9A CN108152744A (en) | 2017-12-12 | 2017-12-12 | Self discharge of lithium iron phosphate battery screening technique |
Publications (1)
| Publication Number | Publication Date |
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| CN108152744A true CN108152744A (en) | 2018-06-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711316992.9A Withdrawn CN108152744A (en) | 2017-12-12 | 2017-12-12 | Self discharge of lithium iron phosphate battery screening technique |
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| Country | Link |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111239625A (en) * | 2020-03-09 | 2020-06-05 | 天津市捷威动力工业有限公司 | SOC range selection method for self-discharge screening, storage medium and equipment |
| CN111697271A (en) * | 2020-03-06 | 2020-09-22 | 万向一二三股份公司 | Lithium ion battery formation and capacity-dividing method |
| CN113655390A (en) * | 2021-08-09 | 2021-11-16 | 湖北亿纬动力有限公司 | Analysis method for differential pressure fault of battery system |
| CN117214740A (en) * | 2023-11-08 | 2023-12-12 | 宁德时代新能源科技股份有限公司 | Self-discharge abnormality detection method and device, electronic equipment and storage medium |
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| CN101907688A (en) * | 2010-08-02 | 2010-12-08 | 天津力神电池股份有限公司 | Method for detecting electrical property consistency of lithium ion battery |
| CN102109580A (en) * | 2011-01-30 | 2011-06-29 | 白科 | Process for detecting self discharge of lithium iron phosphate battery |
| CN102303023A (en) * | 2011-07-22 | 2012-01-04 | 万向电动汽车有限公司 | Method for detecting and sorting self-discharge performance of lithium iron phosphate battery |
| CN102508173A (en) * | 2011-11-30 | 2012-06-20 | 江苏富朗特新能源有限公司 | Self-discharge detection method for lithium iron phosphate batteries |
| CN104090241A (en) * | 2014-07-22 | 2014-10-08 | 合肥国轩高科动力能源股份公司 | Lithium battery self-discharge screening method |
-
2017
- 2017-12-12 CN CN201711316992.9A patent/CN108152744A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101907688A (en) * | 2010-08-02 | 2010-12-08 | 天津力神电池股份有限公司 | Method for detecting electrical property consistency of lithium ion battery |
| CN102109580A (en) * | 2011-01-30 | 2011-06-29 | 白科 | Process for detecting self discharge of lithium iron phosphate battery |
| CN102303023A (en) * | 2011-07-22 | 2012-01-04 | 万向电动汽车有限公司 | Method for detecting and sorting self-discharge performance of lithium iron phosphate battery |
| CN102508173A (en) * | 2011-11-30 | 2012-06-20 | 江苏富朗特新能源有限公司 | Self-discharge detection method for lithium iron phosphate batteries |
| CN104090241A (en) * | 2014-07-22 | 2014-10-08 | 合肥国轩高科动力能源股份公司 | Lithium battery self-discharge screening method |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111697271A (en) * | 2020-03-06 | 2020-09-22 | 万向一二三股份公司 | Lithium ion battery formation and capacity-dividing method |
| CN111239625A (en) * | 2020-03-09 | 2020-06-05 | 天津市捷威动力工业有限公司 | SOC range selection method for self-discharge screening, storage medium and equipment |
| CN113655390A (en) * | 2021-08-09 | 2021-11-16 | 湖北亿纬动力有限公司 | Analysis method for differential pressure fault of battery system |
| CN113655390B (en) * | 2021-08-09 | 2023-10-03 | 湖北亿纬动力有限公司 | Analysis method for differential pressure fault of battery system |
| CN117214740A (en) * | 2023-11-08 | 2023-12-12 | 宁德时代新能源科技股份有限公司 | Self-discharge abnormality detection method and device, electronic equipment and storage medium |
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Application publication date: 20180612 |
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