CN110187291A - Lithium ion battery self discharge fast screening devices and screening technique based on DC impedance - Google Patents
Lithium ion battery self discharge fast screening devices and screening technique based on DC impedance Download PDFInfo
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- CN110187291A CN110187291A CN201910497315.4A CN201910497315A CN110187291A CN 110187291 A CN110187291 A CN 110187291A CN 201910497315 A CN201910497315 A CN 201910497315A CN 110187291 A CN110187291 A CN 110187291A
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- impedance
- busbar connector
- battery core
- self discharge
- lithium ion
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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
-
- 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]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
Abstract
The present invention relates to a kind of lithium ion battery self discharge fast screening devices and screening technique based on DC impedance, multiple single battery core parallel connections are formed into batteries in parallel connection system to construct screening plant, DC impedance test is carried out to batteries in parallel connection system, filter out the single battery core of data discrete, DC impedance test is specially to provide a current wave in the short time, reads distribution of the short time postimpulse electric current in different branch respectively.The beneficial effects of the present invention are: providing a kind of low self discharge screening scheme for putting into and being easily achieved of high efficiency significantly shortens detection time compared with standing method, manpower equipment investment is saved, the production cycle is shortened, improves production efficiency；Simultaneously by the control for input current, slight short circuit can be expanded and without the difference between short-circuit battery core, moreover it is possible to which the single battery core that short-circuit hidden danger will be present induces to be identified for short-circuit battery core, improves the accuracy rate of detection.
Description
Technical field
The invention belongs to battery detecting fields, fast more particularly, to a kind of lithium ion battery self discharge based on DC impedance
Fast screening plant and screening technique.
Background technique
Currently, the policy of the national policy of requirement and upgrading of industries with to(for) environmental protection is favourable, lithium ion battery
Industry has the development advanced by leaps and bounds.Lithium ion battery is widely used in the fields such as energy storage, power vehicle.In the process of application
In, after the battery combination equally made is at battery pack, its service life will be lower than the service life of single battery.This instruction sheet
Body battery consistency significantly affects the service life of battery pack.In the series-parallel application of battery, the consistency of single battery is asked
Topic influences efficiency and the service life of battery pack, and safety problem also has an impact, so, form the consistent of the single battery of battery pack
Property requirement should be more stringent.
The consistency for guaranteeing single battery first has to the consistent of the every initial performance for guaranteeing single battery, i.e. capacity,
Voltage, internal resistance.However the self-discharge performance of single battery is consistent, affects the Life cycle of subsequent use process, and
The single battery core of self discharge difference will cause circulation diving, and safety is out of control to wait bad hidden dangers.The screening of current battery is usually in capacity
After the test of resistance, the screening of self discharge is carried out, and the screening of self discharge is usually static method, i.e. charge or discharge to a certain electricity
Exceptional value is chosen in the OCV drop of pressure observation single battery core or the distribution risen, the method that certain repetition measurement keeps capacity be it is uneconomical and
A kind of inefficient way.It is a raising for efficiency that observation constant voltage charging phase, which is filled with electricity, which is based on certainly
Point of discharge can ceaselessly have electric leakage, to increase the time of constant-voltage charge and be filled with capacity.
But the method based on standing needs the time of one section of stagnation, while the data of secondary repetition measurement battery core being needed to ask poor
The correspondence situation of the case where value, that is, use test data for the first time, is often judged by accident due to the influence of measurement accuracy and production；
And constant voltage charging phase be filled with the time or the screening of capacity is only capable of filtering out the battery core of self discharge severely subnormal, for slight
Self discharge battery core discrimination is lower.The patent of Patent No. CN102901931A disclose it is a kind of by lithium ion battery full of afterwards simultaneously
Connection is stood, and the side of the lithium battery of self discharge exception is screened with the electric current net inflow outflow situation between ammeter observation branch
Method, but influence the difference that net inflow outflow primary factor is SOC, it is same stand also spend a large amount of time and tooling it is big
Amount investment.
Summary of the invention
It is quickly sieved in order to solve the above technical problems, the present invention provides a kind of lithium ion battery self discharge based on DC impedance
Screening device and screening technique.
The technical solution adopted by the present invention is that: the lithium ion battery self discharge fast screening devices based on DC impedance, packet
Busbar connector, lower busbar connector and Hall sensor are included, upper busbar connector and lower busbar connector pass through the multiple monomer electricity of termination contact respectively
The terminal of the positive and negative anodes formation parallel circuit of core, upper busbar connector and the positive interpolar of single battery core is equipped with Hall sensor.
Preferably, it is equipped with multiple battery cores in lower busbar connector and loads position, preferably 7-20, upper busbar connector is set with lower busbar connector
There is equal number of battery core to load position.
Preferably, upper busbar connector and lower busbar connector are all connected with charge-discharge machine, and lower busbar connector is one or more groups of.
Multiple single battery core parallel connections are formed parallel connection by the lithium ion battery self discharge rapid screening method based on DC impedance
Battery system carries out DC impedance test to batteries in parallel connection system, filters out the single battery core of data discrete.
Preferably, DC impedance test is specially to provide a current wave in the short time, is read respectively last in the short time
Distribution of one second electric current in different branch, wherein the short time is 1-30s, and size of current is 1-8C × filling position number.
Preferably, DC impedance test is specially to provide a 5C current wave in 5s, reads each branch of 5s respectively
Size of current.
The advantages and positive effects of the present invention are: providing a kind of low self discharge for putting into and being easily achieved of high efficiency
Screening scheme significantly shortens detection time compared with standing method, saves manpower equipment investment, shortens production
Period improves production efficiency；Simultaneously by the control for input current, can expand slight short circuit with without short-circuit battery core it
Between difference, moreover it is possible to the single battery core that short-circuit hidden danger will be present induces to be identified for short-circuit battery core, improves the accuracy rate of detection；
In addition this method is the comparison of real time data, eliminates primary data since measurement accuracy bring influences.
Detailed description of the invention
Fig. 1 is one embodiment of the present of invention screening plant structural schematic diagram.
In figure:
1, upper busbar connector 2, Hall sensor 3, single battery core
4, lower busbar connector 5, upper terminal 6, lower terminal
Specific embodiment
It explains with reference to the accompanying drawing to one embodiment of the present of invention.
The present invention program is to carry out multiple single battery cores 3 formation batteries in parallel connection system in parallel straight to batteries in parallel connection system
Flow impedance test, specially provides a current wave in the short time, read short time postimpulse electric current respectively in different branch
In distribution, filter out the single battery core 3 of data discrete.
Dress is quickly screened in order to realize that above-mentioned screening technique provides a kind of lithium ion battery self discharge based on DC impedance
It sets, as shown in Figure 1, including upper busbar connector 1, lower busbar connector 4, terminal and Hall sensor 2, terminal includes upper terminal 5 and lower end
Son 6, upper busbar connector 1 is contacted by upper terminal 5 and lower terminal 6 with the positive and negative anodes of single battery core 3 respectively with lower busbar connector 4, upper remittance
Stream row 1 and the positive interpolar of single battery core 3 are equipped with Hall sensor 2, in order to place Hall sensor 2, the upper terminal 5 of upper busbar connector 1
Diameter and length should ensure that Hall sensor 2 installation without interference, enable 2 sets of Hall sensor to converge in connection
On the upper terminal 5 of row 1；It is equipped in lower busbar connector 4 and loads position with the isodiametric channel-shaped battery core of battery core, for being packed into and fixing electricity
Core is arranged more multiple battery cores and loads that its detection effect of position are more accurate, and numerical value difference is more obvious, but its corresponding cost also can be compared with
Height comprehensively considers detection effect and testing cost, and it is relatively reasonable for loading position using 7-20 battery core.Such as seven battery cores of setting
Position is loaded, can once test seven battery cores simultaneously, upper busbar connector 1 is equipped with equal number of battery core with lower busbar connector 4 and loads position；For
The current range for saving 2 cost of Hall sensor and charge-discharge machine can make more lower busbar connectors 4 with the upper busbar connector of unification branch
1 uses；In use, upper busbar connector 1 is all connected with charge-discharge machine with lower busbar connector 4, lower busbar connector 4 is one or more groups of.
According to the principle that the analysis to self discharge, and shunted using between parallel resistance branch, by multiple single battery cores with work
Dress form clamps battery system progress DC impedance test in parallel, to parallel connection, i.e., a current wave is provided in the short time, respectively
Distribution of the short time postimpulse electric current in different branch is read, electricity of last second in different branch in the short time is read
Flow valuve, so that the single battery core of data discrete is filtered out, to realize the purpose that single battery core self discharge is quickly screened.It is wherein short
A length of 1-30s when the time, size of current are 1-8C × filling position number.Comprehensive Experiment effect and testing cost, DC impedance are surveyed
It uses and provides a 5C current wave in 5s, it is best to read mode effect as the size of current of each branch of 5s respectively.
Embodiment 1:
Select battery core for 20ah ternary/lithium titanate cylindrical electrical core, shipment state is 50%SOC, in the last by battery core of chemical conversion
Charge or discharge is to shipment state, then carries out this test.Above-mentioned battery core is installed to lower busbar connector battery core to load in position, upper confluence
Row connects large current density electric equipment charge-discharge machine with lower busbar connector, is filled with charge-discharge machine to screening plant with the electric current of 2C × 7
Electric 5s reads the electric current of 5s, specific value such as table 1；
Table 1
According to 1 data of table, it can be seen that No. 5 battery core current values are apparently higher than other 6 groups, as defect battery core, in order into
Above-mentioned battery core is completely filled rear room temperature and stands 1 month, it is as shown in table 2 to detect its capacity retention ratio by one step card.
Table 2
| Serial number | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| Capacity retention ratio | 98.6% | 99.1% | 98.4% | 99.0% | 96.2% | 99.1% | 99.2% |
By 2 data of table, it can be seen that No. 5 battery core capacity retention ratios are lower than other six groups, No. 5 battery cores are disassembled, discovery
There are the stains that 7 diameters are less than 1mm, as self discharge point for diaphragm.Confirm the accuracy rate of this programme detection.
Embodiment 2:
Select battery core for 20ah ternary/lithium titanate cylindrical electrical core, shipment state is 50%SOC, in the last by battery core of chemical conversion
Charge or discharge to shipment state can carry out this test, this test enlarged sample quantity to 28 single battery cores.
This 28 battery cores are tested by settled process first, after 3 days quiescence in high temperatures, detect its OCV difference, test data
As shown in table 3, unit V；
Table 3
According to 3 data of table, test result is normal, this 28 single battery cores and zero defect battery core.Again by this 28 battery cores
It is divided into 4 groups, is installed in lower busbar connector, is sequentially connected busbar connector, screening plant is filled with the electric current of 5C × 7 with charge-discharge machine
Electric 5s reads the electric current of 5s, specific value such as table 4；
Table 4
| Serial number | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| Current value/A | 19.4 | 18.9 | 24.9 | 19.0 | 19.2 | 19.5 | 19.2 |
| Serial number | 8 | 9 | 10 | 11 | 12 | 13 | 14 |
| Current value/A | 18.8 | 25.7 | 18.7 | 18.6 | 19.6 | 19.1 | 19.3 |
| Serial number | 15 | 16 | 17 | 18 | 19 | 20 | 21 |
| Current value/A | 19.9 | 19.4 | 19.6 | 20.5 | 19.7 | 20.3 | 20.5 |
| Serial number | 22 | 23 | 24 | 25 | 26 | 27 | 28 |
| Current value/A | 20.1 | 20.9 | 20.2 | 19.8 | 19.7 | 20.3 | 19.3 |
According to table 4, it can be seen that No. 3 and No. 9 battery core data compared with other battery cores with significant difference, by No. 3 and No. 9
Battery core dismantling, there is the stain that 5 to 7 diameters are less than 1mm, as short dot in discovery diaphragm, compared with traditional settled process, this
Scheme can expand slight short circuit and without the difference between short-circuit battery core, and the single battery core that short-circuit hidden danger will be present induces for short circuit
Battery core identifies, and this method is the comparison of real time data, eliminates primary data since measurement accuracy bring influences,
Its selection result is more accurate.
One embodiment of the present invention has been described in detail above, but the content is only preferable implementation of the invention
Example, should not be considered as limiting the scope of the invention.It is all according to all the changes and improvements made by the present patent application range
Deng should still be within the scope of the patent of the present invention.
Claims (6)
1. the lithium ion battery self discharge fast screening devices based on DC impedance, it is characterised in that: including upper busbar connector, lower remittance
Stream row and Hall sensor, the upper busbar connector pass through the positive and negative of the multiple single battery cores of termination contact with the lower busbar connector respectively
The terminal of pole formation parallel circuit, the upper busbar connector and the positive interpolar of the single battery core is equipped with the hall sensing
Device.
2. the lithium ion battery self discharge fast screening devices according to claim 1 based on DC impedance, feature exist
In: it is equipped with multiple battery cores in the lower busbar connector and loads position, preferably 7-20, the upper busbar connector is set with the lower busbar connector
There is equal number of battery core to load position.
3. the lithium ion battery self discharge fast screening devices according to claim 2 based on DC impedance, feature exist
In: the upper busbar connector and the lower busbar connector are all connected with charge-discharge machine, and the lower busbar connector is one or more groups of.
4. the lithium ion battery self discharge rapid screening method based on DC impedance, it is characterised in that: simultaneously by multiple single battery cores
Connection forms batteries in parallel connection system, carries out DC impedance test to batteries in parallel connection system, filters out the single battery core of data discrete.
5. the lithium ion battery self discharge rapid screening method according to claim 4 based on DC impedance, feature exist
In: DC impedance test is specially to provide a current wave in the short time, reads short time interior last second electric current respectively not
With the distribution in branch, wherein the short time is 1-30s, and size of current is 1-8C × filling position number.
6. the lithium ion battery self discharge rapid screening method according to claim 5 based on DC impedance, feature exist
In: DC impedance test is specially to provide a 5C current wave in 5s, reads the size of current of each branch of 5s respectively.
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Cited By (3)
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| CN111142035A (en) * | 2020-03-06 | 2020-05-12 | 合肥国轩高科动力能源有限公司 | Method for testing internal short circuit of lithium battery |
| CN111781510A (en) * | 2020-06-09 | 2020-10-16 | 合肥国轩高科动力能源有限公司 | Method for screening abnormal self-discharge batteries |
| CN111965545A (en) * | 2020-07-31 | 2020-11-20 | 蜂巢能源科技有限公司 | Lithium battery self-discharge detection method, device and system |
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| CN111781510A (en) * | 2020-06-09 | 2020-10-16 | 合肥国轩高科动力能源有限公司 | Method for screening abnormal self-discharge batteries |
| CN111965545A (en) * | 2020-07-31 | 2020-11-20 | 蜂巢能源科技有限公司 | Lithium battery self-discharge detection method, device and system |
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