CN108539299A - A kind of multi-series and parallel Li-ion batteries piles dynamic low voltage method for group matching and system - Google Patents
A kind of multi-series and parallel Li-ion batteries piles dynamic low voltage method for group matching and system Download PDFInfo
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- CN108539299A CN108539299A CN201810322574.9A CN201810322574A CN108539299A CN 108539299 A CN108539299 A CN 108539299A CN 201810322574 A CN201810322574 A CN 201810322574A CN 108539299 A CN108539299 A CN 108539299A
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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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
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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
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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
Abstract
The invention discloses a kind of multi-series and parallel Li-ion batteries piles dynamic low voltage method for group matching and system, the method includes：A batch is waited for that combo battery core is discharged to predetermined voltage U by loading with scheduled current I；Load is disconnected, described waits for that combo battery core stores the first predetermined time H1 at the first predetermined temperature T1 by each；Test obtains each first open-circuit voltage OCV1 for waiting for combo battery core；Described wait for that combo battery core stores the second predetermined time H2 at the second predetermined temperature T2 by each；Test obtains each second open-circuit voltage OCV2 for waiting for combo battery core；Calculate each battery core bounce voltage drop △ V, △ V=OCV2 OCV1 for waiting for combo battery core；To it is each it is described wait for that combo battery core carries out combo, by △ V are identical or approach identical to wait for that combo battery core is matched described in several be one group.The present invention can efficiently reduce service life consumption and security risk caused by polarity effect difference of the battery pack due to battery core.
Description
Technical field
The present invention relates to field of lithium ion battery more particularly to a kind of multi-series and parallel Li-ion batteries piles dynamic low voltage to match prescription
Method and system.
Background technology
The combo mode that most of Li-ion batteries piles manufacturers select at present is that battery core is in carried charge 50% or so
In the case of provide performance indicator and carry out combo, common performance indicator has capacity, voltage etc..Such as Chinese invention patent
201210375543.2 disclose a kind of method for group matching of lithium ion battery, by performance indicators such as capacity, voltage, internal resistances to lithium
Ion battery carries out combo.
But this kind of scheme is the simple basic performance matching of battery core, what is utilized is static battery core characteristic combo, electricity
The characteristic of core does not embody completely.Battery core is not considered especially in low capacity (low pressure in other words) state, because of the polarization of battery core
It is negatively affected caused by effect.
According to the characteristic of lithium-ion electric core, battery core is in electric discharge end (under low-pressure state), due to its material polarization characteristic, meeting
Cause the impedance variations of different battery cores in same battery pack inconsistent.Therefore under the action of same electric current, different battery core bands carry
Ability it is different, inconsistent in the pressure drop that battery core both ends generate, the battery core for causing individual polarity effects big can shift to an earlier date Cross prevention,
And the small battery core of polarity effect is not discharged also at this time, the capacity for being directed at battery pack plays less.Such battery pack makes for a long time
With in cyclic process, the polarization of battery core is increasing, and pressure difference is increasing therewith, and the discharge time of battery pack is caused to shorten,
The service life of battery pack is just shortened.
In addition to this, when battery core causes pressure difference big because of polarity effect, if battery pack recharges after being discharged, can cause
The small battery core that polarizes occurs filling full phenomenon in advance, or even overcharges and generate security risk.
Invention content
The purpose of the present invention is to provide a kind of multi-series and parallel Li-ion batteries piles dynamic low voltage method for group matching and systems, select
The close battery core of polarity effect carries out combo, to solve problem above.
For this purpose, the present invention uses following technical scheme：
A kind of multi-series and parallel Li-ion batteries piles dynamic low voltage method for group matching, including：
A batch is waited for that combo battery core is discharged to predetermined voltage U by loading with scheduled current I；
Load is disconnected, described waits for that combo battery core stores the first predetermined time H1 at the first predetermined temperature T1 by each；
Test obtains each first open-circuit voltage OCV1 for waiting for combo battery core；
Described wait for that combo battery core stores the second predetermined time H2 at the second predetermined temperature T2 by each；
Test obtains each second open-circuit voltage OCV2 for waiting for combo battery core；
Calculate each battery core bounce voltage drop △ V, △ V=OCV2-OCV1 for waiting for combo battery core；
To it is each it is described wait for that combo battery core carries out combo, it is △ V is identical or approach is identical waits for combo battery core described in several
With being one group.
Optionally, it is described to it is each it is described wait for that combo battery core carries out combo, by △ V are identical or approach is identical described in several
It is one group to wait for that combo battery core is matched；It specifically includes：
It selects and waits in combo battery core that △ V are identical described in a batch or approach is identical waits for combo battery core described in several, will select
Go out several described in wait for combo battery core match be one group；
Alternatively, calculating each depression belt for waiting for combo battery core carries voltage K, K=△ V/H2, selects and wait for combo described in a batch
K is identical in battery core or approach is identical waits for combo battery core described in several, and several each described combo battery core combo is waited for by what is selected
One group.
Optionally, described that a batch is waited for that combo battery core is discharged to predetermined voltage U by loading with scheduled current I, before also
Including：
The performance indicator of each battery core in multiple battery cores is obtained in advance, and performance indicator includes capacity, voltage, AC impedance
With short time voltage storage change value, the consistent multiple battery cores of performance indicator are formed into a batch and wait for combo battery core.
Optionally, described to wait for that combo battery core is discharged to predetermined voltage U by loading with scheduled current I by multiple, before also
Including：It described waits for that coding information is arranged in combo battery core each；
The test obtains each first open-circuit voltage OCV1 for waiting for combo battery core, further includes before：Scanning obtains each
The coding information for waiting for combo battery core；
The test obtains each first open-circuit voltage OCV1 for waiting for combo battery core, further includes later：It described is waited for each
First open-circuit voltage OCV1 of combo battery core is corresponded with its coding information；
The test obtains each second open-circuit voltage OCV2 for waiting for combo battery core, further includes before：Scanning obtains each
The coding information for waiting for combo battery core；
The test obtains each second open-circuit voltage OCV2 for waiting for combo battery core, further includes later：It described is waited for each
Second open-circuit voltage OCV2 of combo battery core is corresponded with its coding information.
Optionally, described that a batch is waited for that combo battery core is discharged to predetermined voltage U by loading with scheduled current I, before also
Including：
Control parameter is preset, control parameter includes that either the grouping step value of K, the grouping of △ V or K are initial by △ V
Value, scheduled current I, predetermined voltage U, the first predetermined temperature T1, the first predetermined time H1, the second predetermined temperature T2, second make a reservation for
Time H2.
Optionally, multiple battery cores that performance indicator is consistent form a batch and wait for combo battery core, specifically include：
According to capacity by multiple battery cores be divided into it is several first, by the consistent multiple battery cores compositions one of capacity
Batch；Each first is divided into several second batchs according to voltage, the consistent multiple battery cores of voltage are formed into a batch；According to exchange
Each second batch is divided into several thirds batch by impedance, and the consistent multiple battery cores of AC impedance are formed a batch；According to the short time
Each third batch is divided into several 4th batches by voltage storage change value, by the consistent multiple electricity of short time voltage storage change value
Core forms a batch and waits for combo battery core.
Optionally, described that a batch is waited for that combo battery core is discharged to predetermined voltage U by loading with scheduled current I；Wherein, institute
It states and waits for that combo battery core is fully charged state；
Scheduled current I is 0.2/ unit interval of battery core capacity C * for waiting for combo battery core, and predetermined voltage U waits matching to be described
The blanking voltage of group battery core；
First predetermined temperature T1 is 25 DEG C or 45 DEG C, and it is 48h that the first predetermined time H1 is most short；
It is most short for for 24 hours that second predetermined temperature T2 is equal to the first predetermined temperature T1, the second predetermined time H2.
Optionally, predetermined voltage U is 3.0V；First predetermined temperature T1 is 45 DEG C, and the first predetermined time H1 is 72h；Second
Predetermined time H2 is 72h.
A kind of multi-series and parallel Li-ion batteries piles dynamic low voltage combo system, including battery core bunkerage, battery core performance test
Equipment；
The battery core bunkerage can control the temperature and time of battery core storage for being stored to battery core；
The battery core performance test apparatus makes battery core be discharged to predetermined voltage U with scheduled current I for providing load.Also
Performance parameter for detecting battery core, performance parameter include the first open-circuit voltage OCV1 and the second open-circuit voltage OCV2.
Optionally, the multi-series and parallel Li-ion batteries piles dynamic low voltage combo system further includes that encoding device and scanning are set
It is standby；
The encoding device is ink jet numbering machine, for preparing coding information in battery core；The scanning device is scanner, is used
The coding information of battery core is obtained in scanning；
The multi-series and parallel Li-ion batteries piles dynamic low voltage combo system further includes terminal；The terminal is electrically connected institute
State battery core bunkerage, battery core performance test apparatus and the scanner；The terminal includes setting unit, control unit, adopts
Sample unit, storage unit and data processing unit；
The setting unit is electrically connected the storage unit；The setting unit will be controlled for setting control parameter
Parameter is stored to the storage unit；The control parameter include △ V either K grouping step value, △ V or K grouping at the beginning of
Initial value, scheduled current I, predetermined voltage U, the first predetermined temperature T1, the first predetermined time H1, the second predetermined temperature T2 and second are pre-
Fix time H2；
Described control unit is electrically connected the storage unit, the battery core bunkerage and the battery core performance test and sets
It is standby；Described control unit is used to, according to the control parameter in storage unit, control the battery core performance test apparatus and the electricity
The work of pressing detecting device；
The sampling unit is electrically connected the storage unit, battery core performance test apparatus and scanning device；The sampling is single
Coding information and performance parameter of the member for sampling battery core；
The storage unit, for storing coding information, control parameter and performance parameter；
The data processing unit is electrically connected storage unit, for calculating △ V or K, and is matched according to result of calculation
Group.
Compared with prior art, the invention has the advantages that：
The present invention is based on battery cores when discharging end, the negative effect that polarity effect generates, by testing and calculating acquisition
△ V drop in battery core bounce voltage of the battery core in low pressure, and select close several of polarity effect in a collection of battery core according to △ V
Battery core carries out combo, and service life disappears caused by the present invention can efficiently reduce polarity effect difference of the battery pack due to battery core
Consumption and security risk.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without having to pay creative labor, may be used also for those of ordinary skill in the art
To obtain other attached drawings according to these attached drawings.
Fig. 1 is the flow chart for the multi-series and parallel Li-ion batteries piles dynamic low voltage method for group matching that the embodiment of the present invention one provides.
Fig. 2 is the flow chart of multi-series and parallel Li-ion batteries piles dynamic low voltage method for group matching provided by Embodiment 2 of the present invention.
Fig. 3 is the structure chart for the multi-series and parallel Li-ion batteries piles dynamic low voltage combo system that the embodiment of the present invention four provides.
In figure：10, battery core bunkerage；20, battery core performance test apparatus；30, scanning device；40, terminal；41, it is arranged
Unit；42, storage unit；43, control unit；44, sampling unit；45, data processing unit.
Specific implementation mode
In order to make the invention's purpose, features and advantages of the invention more obvious and easy to understand, below in conjunction with the present invention
Attached drawing in embodiment, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that disclosed below
Embodiment be only a part of the embodiment of the present invention, and not all embodiment.Based on the embodiments of the present invention, this field
All other embodiment that those of ordinary skill is obtained without making creative work, belongs to protection of the present invention
Range.
Technical solution to further illustrate the present invention below with reference to the accompanying drawings and specific embodiments.
Embodiment one
Referring to Fig. 1, present embodiments providing a kind of multi-series and parallel Li-ion batteries piles dynamic low voltage method for group matching, can choose
The product that polarity effect is close in multiple battery cores is selected to carry out combo, this method includes：
Step S101, a batch is waited for that combo battery core is discharged to predetermined voltage U by loading with scheduled current I.
In the present embodiment, scheduled current I is 0.2/ unit interval of battery core capacity C * for waiting for combo battery core.Such as in this hair
In a bright specific example, wait for that the battery core capacity C of combo is 2200mAh, scheduled current I is 440mA, i.e. I=2200mAh*
0.2/1h=440mA.
Scheduled current I can also be needed for the battery pack according to client to final combo battery power discharge electric current set
Fixed, discharge current when battery pack works is smaller, and battery core polarity effect when being discharged in battery pack is bigger.It is put according to battery pack
Electric current setting scheduled current I can make the battery core polarity effect that test obtains close to the situation in real work.
Predetermined voltage U is the blanking voltage for waiting for combo battery core, and in the present embodiment, predetermined voltage U is 3.0V.Thus it will wait for
Combo battery core is discharged to the minimum point of its battery core capacity, to can measure the low pressure polarity effect for waiting for combo battery core.
In the present embodiment, battery core is that full be full of is put, i.e., respectively waits for that combo battery core is discharged since fully charged state, in this way
The polarity effect that test obtains can be made as possible close to the situation in real work.And battery core is completely put from being completely charged to, can be with
The discharge capacity that battery core is measured using the step carries out battery core conventional capacity combo, to save significantly according to discharge capacity
About entire battery core combo flow improves battery core combo efficiency.
Step S102, load is disconnected, will respectively wait for that combo battery core stores the first predetermined time H1 at the first predetermined temperature T1.
Due to battery core polarity effect, after combo battery core after losing load, floating voltage will gradually rebound.
First predetermined temperature T1 can be room temperature value or high temperature values, specifically, the first predetermined temperature T1 recommends selection 25
DEG C or 45 DEG C.In the specific example of the present invention, the first predetermined temperature T1 is 45 DEG C, and higher temperature can make battery core
Quickly stablize.
It is 48h that first predetermined time H1 is most short, and voltage can just be stablized general lithium battery after 48-72h after being discharged.First
Predetermined time, H1 was longer, and final battery core combo is more accurate.In the specific example of the present invention, the first predetermined time H1 is
72h, to ensure the accuracy of test result.
Step S103, test obtains the first open-circuit voltage OCV1 for respectively waiting for combo battery core.
Step S104, it will respectively wait for that combo battery core stores the second predetermined time H2 at the second predetermined temperature T2.
In the present embodiment, the second predetermined temperature T2 is equal with the first predetermined temperature T1.
Second predetermined time H2 is most short for for 24 hours, the time is longer, and the accuracy of test result is higher, and battery core combo effect is got over
It is good.In the specific example of the present invention, the second predetermined time H2 is 72h, to improve the accuracy of test result.
Step S105, test obtains the second open-circuit voltage OCV2 for respectively waiting for combo battery core.
Step S106, battery core bounce voltage drop △ V, the △ V=OCV2-OCV1 for respectively waiting for combo battery core are calculated.
Step S107, to respectively wait for combo battery core carry out combo, by △ V it is identical or approach identical several wait for combo battery core
With being one group.
In the present embodiment, it is that basis respectively waits for that the grouping of the △ V of combo battery core, the grouping step value of △ V and △ V are initial
Value is grouped.It is the difference of the maxima and minima in each group when being grouped to be grouped step value.It is in all groups to be grouped initial value
Minimum value or maximum value.The grouping step value of △ V can be selected according to the demand of user.The grouping initial value of △ V can be with
It is set according to user demand, can also fix and be set as calculating the minimum value or maximum value in the △ V obtained.
The grouping step value of △ V is smaller, and the polarity effect between battery core in same group is more similar.At one of the present invention
In specific example, the grouping step value of △ V is 4mV, and grouping initial value is 4.5mV.
It is understood that each control parameter involved in the present embodiment, in advance such as scheduled current I, predetermined voltage U, first
Constant temperature degree T1, the first predetermined time H1, the second predetermined temperature T2, the second predetermined time H2, the grouping step value of △ V and △ V
Grouping initial value can be set according to actual demand.
It is understood that other statistical method can also be utilized, according to the △ V progress combos for respectively waiting for combo battery core.Example
The variance for such as calculating the △ V for respectively waiting for combo battery core, by variance it is excessive wait for combo battery core exclude.
Multi-series and parallel Li-ion batteries piles dynamic low voltage method for group matching provided in this embodiment, by testing and calculating obtains
△ V drop in battery core bounce voltage of the battery core in low pressure, and select the battery core that polarity effect is close in multiple battery cores according to △ V and carry out
Combo can reduce service life caused by polarity effect difference of the battery pack due to battery core and consume and overcharge security risk.This
The method for group matching that embodiment provides is not limited by the battery core number of the capacity limit of battery core and battery pack, can operate with any more strings
And the battery cores of Li-ion batteries piles assemble.
Embodiment two
The present embodiment has carried out part on the basis of embodiment one and has changed.
Referring to Fig. 2, present embodiments providing multi-series and parallel Li-ion batteries piles dynamic low voltage method for group matching, can select more
The product that polarity effect is close in a battery core carries out combo, and this method includes：
Step S201, control parameter is preset, control parameter includes the grouping initial value, pre- of the grouping step value of K, K
Constant current I, predetermined voltage U, the first predetermined temperature T1, the first predetermined time H1, the second predetermined temperature T2 and the second predetermined time
H2。
Step S202, a batch is waited for that combo battery core is discharged to predetermined voltage U by loading with scheduled current I.
In the present embodiment, scheduled current I is 0.2/ unit interval of battery core capacity C * for waiting for combo battery core.Such as in this hair
In a bright specific example, wait for that the battery core capacity C of combo is 2200mAh, scheduled current I is 440mA, i.e. I=2200mAh*
0.2/1h=440mA.
Scheduled current I can also be needed for the battery pack according to client to final combo battery power discharge electric current set
Fixed, discharge current when battery pack works is smaller, and battery core polarity effect when being discharged in battery pack is bigger.It is put according to battery pack
Electric current setting scheduled current I can make the battery core polarity effect that test obtains close to the situation in real work.
Predetermined voltage U is the blanking voltage for waiting for combo battery core, and in the present embodiment, predetermined voltage U is 3.0V.Thus it will wait for
Combo battery core is discharged to the minimum point of its battery core capacity, to can measure the low pressure polarity effect for waiting for combo battery core.
In the present embodiment, battery core is that full be full of is put, i.e., respectively waits for that combo battery core is discharged since fully charged state, in this way
The polarity effect that test obtains can be made as possible close to the situation in real work.And battery core is completely put from being completely charged to, can be with
The discharge capacity that battery core is measured using the step carries out battery core conventional capacity combo, to save significantly according to discharge capacity
About entire battery core combo flow improves battery core combo efficiency.
Step S203, load is disconnected, will wait for that combo battery core stores the first predetermined time H1 at the first predetermined temperature T1.
Due to battery core polarity effect, after combo battery core after losing load, floating voltage will gradually rebound.
First predetermined temperature T1 can be room temperature value or high temperature values, specifically, the first predetermined temperature T1 recommends selection 25
DEG C or 45 DEG C.In the specific example of the present invention, the first predetermined temperature T1 is 45 DEG C, and higher temperature can make battery core
Quickly stablize.
It is 48h that first predetermined time H1 is most short, and voltage can just be stablized general lithium battery after 48-72h after being discharged.First
Predetermined time, H1 was longer, and final battery core combo is more accurate.In the specific example of the present invention, the first predetermined time H1 is
72h, to ensure the accuracy of test result.
Step S204, coding information is set on respectively waiting for combo battery core.
It will can respectively wait for that combo battery core accurately distinguishes by coding information.
Step S205, scanning obtains the coding information for respectively waiting for combo battery core, and test obtains and respectively waits for that the first of combo battery core opens
Road voltage OCV1 corresponds the first open-circuit voltage OCV1 for respectively waiting for combo battery core with its coding information.
Step S206, it will respectively wait for that combo battery core stores the second predetermined time H2 at the second predetermined temperature T2.
In the present embodiment, the second predetermined temperature T2 is equal with the first predetermined temperature T1.
Second predetermined time H2 is most short for for 24 hours, the time is longer, and the accuracy of test result is higher, and battery core combo effect is got over
It is good.In the specific example of the present invention, the second predetermined time H2 is 72h, to improve the accuracy of test result.
Step S207, scanning obtains the coding information for respectively waiting for combo battery core, and test obtains and respectively waits for that the second of combo battery core opens
Road voltage OCV2 corresponds the second open-circuit voltage OCV2 for respectively waiting for combo battery core with its coding information.
Step S208, it calculates and respectively waits for that the depression belt of combo battery core carries voltage K, K=(OCV2-OCV1)/H2.
Step S209, to respectively wait for combo battery core carry out combo, by K it is identical or approach identical several wait for that combo battery core is matched
It is one group.
In the present embodiment, it is to be carried out according to the grouping step value for K, the K for respectively waiting for combo battery core and the grouping initial value of K
Grouping.It is the difference of the maxima and minima in each group when being grouped to be grouped step value.It is the minimum in all groups to be grouped initial value
Value or maximum value.The grouping step value of K can be selected according to the demand of user.The grouping initial value of K can be according to user's need
Setting is asked, can also fix and be set as calculating the minimum value or maximum value in the K obtained.
Since battery core voltage is in rebound, bounce voltage is related with the time.In the present embodiment, combo, phase are carried out using K
For using △ V to carry out combo in embodiment one, it is contemplated that the concept of time is averaged to △ V, can be preferably
Illustrate the polarity effect of battery core.Using K combos, all battery cores can be made with respect to " just ", while also eliminating the phase before and after battery core
Error judges caused by voltage bounce is different.
In the present embodiment, a batch in step S202 waits for that combo battery core is a batch electricity by conventional method for group matching combo
Core.Further include a step S200 before step S201.
Step S200, the performance indicator of each battery core in multiple battery cores is obtained in advance, and performance indicator includes capacity, voltage, friendship
The consistent multiple battery cores of performance indicator are formed a batch and wait for combo battery core by flow impedance and short time voltage storage change value.
Wherein, the consistent multiple battery cores of performance indicator are formed into a batch and waits for combo battery core, specifically included：
According to capacity by multiple battery cores be divided into it is several first, the consistent multiple battery cores of capacity are formed into a batch；According to electricity
Each first is divided into several second batchs by pressure, and the consistent multiple battery cores of voltage are formed a batch；According to AC impedance by each second
Group is divided into several thirds batch, and the consistent multiple battery cores of AC impedance are formed a batch；It will according to short time voltage storage change value
Each third batch is divided into several 4th batches, and the consistent multiple battery cores of short time voltage storage change value, which are formed a batch, waits for combo electricity
Core.
I.e. each 4th batch is waited for combo battery core for a batch.
It is understood that above according to the suitable of capacity, voltage, AC impedance and short time voltage storage change value grouping
Sequence is to set for ease of description, and sequencing can be adjusted arbitrarily.
Multi-series and parallel Li-ion batteries piles dynamic low voltage method for group matching provided in this embodiment, by testing and calculating obtains
Depression belt of the battery core in low pressure carries voltage K, and selects the battery core that polarity effect is close in multiple battery cores according to K and carry out combo,
Service life caused by polarity effect difference of the battery pack due to battery core can be reduced and consume and overcharge security risk.Matched using K
Group considers the concept of time, illustrates the polarity effect of battery core with capable of replacing.The present embodiment also encodes with more battery core
Each battery core is distinguished well.
Embodiment three
The present embodiment further describes the multi-series and parallel lithium ion battery of the present invention using 10 battery core samples as specific example
Group dynamic low voltage method for group matching.
18650 type of cylindrical electrical core of 10 battery core capacity 2200mAh is produced as specific example using same a batch.It is set using coding
It is standby to wait for that coding information is arranged in combo battery core at 10.Wherein, encoding device is ink jet numbering machine, by battery core identification information spray printing in electricity
Wicking surface.
Wait for that combo battery core uses 440mA current discharges to 3.0V by 10.72h is stored at 45 DEG C.
The coding information for respectively waiting for combo battery core is obtained using scanning device scanning, test obtains the first open circuit electricity of each battery core
OCV1 is pressed, the OCV1 for respectively waiting for combo battery core is corresponded with coding information, is stored into computer.Wherein, scanning device is
The scanner used corresponding with ink jet numbering machine.
Wait for that combo battery core stores 72h at 45 DEG C by 10.Similarly, test obtains and respectively waits for that the second of combo battery core opens
Road voltage OCV2 is corresponded with coding information, is stored into computer.
△ V=OCV1-OCV2 are calculated by computer；K=(OCV2-OCV1)/72.
Following table is obtained after testing and calculate as stated above:
| Project | Sample 1 | Sample 2 | Sample 3 | Sample 4 | Sample 5 |
| OCV1(mV) | 3455.38 | 3459.38 | 3453.12 | 3454.22 | 3451.17 |
| OCV2(mV) | 3449.44 | 3449.18 | 3450.33 | 3449.48 | 3442.33 |
| △V(mV) | 5.94 | 10.2 | 2.79 | 4.74 | 8.84 |
| K2(mV/h) | 0.08 | 0.14 | 0.04 | 0.07 | 0.12 |
| Sample 6 | Sample 7 | Sample 8 | Sample 9 | Sample 10 | |
| OCV1(mV) | 3466.22 | 3440.65 | 3452.38 | 3453.36 | 3454.38 |
| OCV2(mV) | 3455.98 | 3433.71 | 3444.31 | 3448.38 | 3445.38 |
| △V(mV) | 10.24 | 6.94 | 8.07 | 4.98 | 9 |
| K2(mV/h) | 0.14 | 0.10 | 0.11 | 0.07 | 0.13 |
In the present embodiment, it is 4mV with the grouping step value of △ V, grouping initial value is that 4.5mV carries out combo, i.e., by △ V
It is divided into one group for multiple battery cores of 4.5-8.5mV, multiple battery cores that △ V are 8.5-12.5mV is divided into one group；Or with point of K
Group step value be 0.05mV/h, grouping initial value be 0.04mV/h carry out combo, i.e., by K be 0.04-0.09mV/h multiple electricity
Core is to be divided into one group, and multiple battery cores that K is 0.09-0.14mV/h are divided into one group.Carrying out combo according to △ V or K can obtain
To the combo of following two table.
By the above method, if battery core combination is two concatenated modes, four battery cores in first group can be with
It is arbitrarily made with two groups of battery packs two-by-two, six battery cores in second group can be arbitrarily made with three groups of battery packs two-by-two, finally
Battery core charge and discharge under same electric current in the battery pack that combo obtains, polarity effect is very close, can effectively avoid electricity
The negative effect of core polarization effect.
The multi-series and parallel Li-ion batteries piles dynamic low voltage that the present embodiment further describes the present invention by specific example is matched
Group method.
Example IV
Referring to Fig. 3, a kind of multi-series and parallel Li-ion batteries piles dynamic low voltage combo system is present embodiments provided, including：
Battery core bunkerage 10, battery core performance test apparatus 20, encoding device, scanning device 30 and terminal 40.Terminal 40 is electrically connected respectively
Connect battery core bunkerage 10, battery core performance test apparatus 20 and scanning device 30.
Battery core bunkerage 10 can control the temperature and time of battery core storage for being stored to battery core.
Battery core performance test apparatus 20 makes battery core be discharged to predetermined voltage U with scheduled current I for providing load.Also use
In the performance parameter of detection battery core.Wherein, performance parameter includes the first open-circuit voltage OCV1 and the second open-circuit voltage OCV2, may be used also
Including capacity, voltage, AC impedance and short time voltage storage change value.
Encoding device, for preparing coding information in battery core.Specifically, encoding device is ink jet numbering machine, for that will encode
Information spray printing is on battery core surface.
Scanning device 30, for scanning the coding information obtained in battery core.Specifically, scanning device 30 is and ink jet numbering machine pair
The scanner that should be worked.
Terminal 40 includes setting unit 41, storage unit 42, control unit 43, sampling unit 44 and data processing unit
45。
Setting unit 41 is electrically connected storage unit 42.Setting unit 41 is low for setting multi-series and parallel Li-ion batteries piles dynamic
The control parameter in method for group matching is pressed, and control parameter is stored to storage unit 42.Control parameter specifically includes：△ V or K
Grouping step value, the grouping initial value of △ V or K, scheduled current I, predetermined voltage U, the first predetermined temperature T1, first predetermined
Time H1, the second predetermined temperature T2 and second predetermined time H2 etc..
Storage unit 42 is for storing coding information, control parameter and performance parameter.
Control unit 43 is electrically connected storage unit 42, battery core bunkerage 10 and battery core performance test apparatus 20.Control is single
Member 43 is for according to the control parameter in storage unit 42, control battery core performance test apparatus 20 and battery core performance test apparatus 20
Work.
Sampling unit 44 is electrically connected storage unit 42, battery core performance test apparatus 20 and scanning device 30.Sampling unit 44
The coding information that battery core is sampled by scanning device 30 samples the performance parameter of battery core by battery core performance test apparatus 20, and
Coding information and performance parameter are stored to storage unit 42.
Data processing unit 45 is electrically connected storage unit 42.Data processing unit 45 is used to call the number in the unit of storage
According to, and data are calculated and handled.In the present embodiment, data processing unit 45 is for calculating △ V or K, and according to
Result of calculation carries out combo.It can also be according to capacity, voltage, AC impedance and short time voltage storage change value combo.
In the present embodiment, the specific workflow of multi-series and parallel Li-ion batteries piles dynamic low voltage combo system is as follows：
Control parameter is set by setting unit 41, and control parameter is inputted into storage unit 42.Control unit 43 later
By calling the control parameter in storage unit 42, the work of control battery core performance test apparatus 20 and battery core bunkerage 10.
It will wait for that combo battery core is put into battery core performance test apparatus 20.Load, test are equipped in battery core performance test apparatus 20
When, load electrical connection battery core starts to discharge after battery core connects load.Battery core performance test apparatus 20 can control the electric discharge of battery core
Electric current, and the voltage of battery core is obtained in real time.In the present embodiment, battery core performance test apparatus 20 is set to control electricity by control unit 43
Core is discharged to predetermined voltage U with scheduled current I.
After battery core is discharged to predetermined voltage U, load is disconnected, battery core is put into battery core bunkerage 10.In this implementation
In example, battery core bunkerage 10 is controlled by control unit 43, battery core is made to store the first pre- timing at the first predetermined temperature T1
Between H1.
After storing for the first time, coding information is arranged in battery core by encoding device.
The coding information for obtaining battery core is scanned by scanning device 30, and battery core is put back into battery core performance test apparatus 20
In, test obtains the first open-circuit voltage OCV1 of battery core.Test result and coding information are sampled by sampling unit 44, and will be every
The test result of a battery core and its coding information correspond, and input storage unit 42.
The battery core that test is completed is put back in battery core bunkerage 10 again.Battery core bunkerage is controlled by control unit 43
10, so that battery core is stored the second predetermined time H2 at the second predetermined temperature T2.
After second is stored, the coding information for obtaining battery core is scanned by scanning device 30, and battery core is put back into electricity
Core performance test equipment 20, test obtain the second open-circuit voltage OCV2 of battery core.By sampling unit 44 sample test result and
Coding information, and the test result of each battery core and its coding information are corresponded, input storage unit 42.
The control parameter, performance parameter and coding letter of storage are called from storage unit 42 by data processing unit 45
Breath.In the present embodiment, the second predetermined time H2, the first open-circuit voltage OCV1, the second open-circuit voltage OCV2 and coding letter are called
Breath carries voltage K, △ V=OCV2-OCV1, K=(OCV2-OCV1)/H2 to calculate battery core bounce voltage drop △ V or depression belt.
After the completion of calculating, data processing unit 45 calls grouping step value, the △ V of △ V or K from storage unit 42 again
Or the grouping initial value of K, and combo is carried out to battery core according to the value of calling and result of calculation.
It is understood that the processes such as transfer of the above battery core it is complete can also to be equipped with manipulator by manual operation
At.
A kind of multi-series and parallel Li-ion batteries piles dynamic low voltage combo system provided in this embodiment can be according to the pole of battery core
Change effect and combo is carried out to battery core, service life caused by polarity effect difference of the battery pack due to battery core can be efficiently reduced
Consumption and security risk.
The above, the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to before
Stating embodiment, invention is explained in detail, it will be understood by those of ordinary skill in the art that：It still can be to preceding
The technical solution recorded in each embodiment is stated to modify or equivalent replacement of some of the technical features；And these
Modification or replacement, the spirit and scope for various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution.
Claims (10)
1. a kind of multi-series and parallel Li-ion batteries piles dynamic low voltage method for group matching, which is characterized in that including：
A batch is waited for that combo battery core is discharged to predetermined voltage U by loading with scheduled current I；
Load is disconnected, described waits for that combo battery core stores the first predetermined time H1 at the first predetermined temperature T1 by each；
Test obtains each first open-circuit voltage OCV1 for waiting for combo battery core；
Described wait for that combo battery core stores the second predetermined time H2 at the second predetermined temperature T2 by each；
Test obtains each second open-circuit voltage OCV2 for waiting for combo battery core；
Calculate each battery core bounce voltage drop △ V, △ V=OCV2-OCV1 for waiting for combo battery core；
To it is each it is described wait for that combo battery core carries out combo, wait for described in several combo battery core with being by △ V are identical or approach is identical
One group.
2. multi-series and parallel Li-ion batteries piles dynamic low voltage method for group matching according to claim 1, which is characterized in that described right
It is each it is described wait for that combo battery core carries out combo, by △ V are identical or approach identical to wait for that combo battery core is matched described in several be one group；Tool
Body includes：
It selects and waits in combo battery core that △ V are identical described in a batch or approach is identical waits for combo battery core described in several, by what is selected
It is one group to wait for that combo battery core is matched described in several；
Alternatively, calculating each depression belt for waiting for combo battery core carries voltage K, K=△ V/H2, selects and wait for combo battery core described in a batch
Middle K is identical or approach is identical waits for combo battery core described in several, and several each described one group of combo battery core combo is waited for by what is selected.
3. multi-series and parallel Li-ion batteries piles dynamic low voltage method for group matching according to claim 1, which is characterized in that described to incite somebody to action
A batch waits for that combo battery core is discharged to predetermined voltage U by loading with scheduled current I, further includes before：
Obtain the performance indicator of each battery core in multiple battery cores in advance, performance indicator includes capacity, voltage, AC impedance and short
The consistent multiple battery cores of performance indicator are formed a batch and wait for combo battery core by time voltage storage change value.
4. multi-series and parallel Li-ion batteries piles dynamic low voltage method for group matching according to claim 1, which is characterized in that described to incite somebody to action
It is multiple to wait for that combo battery core is discharged to predetermined voltage U by loading with scheduled current I, further include before：It is each it is described wait for combo electricity
Coding information is set on core；
The test obtains each first open-circuit voltage OCV1 for waiting for combo battery core, further includes before：Scanning obtains each described
Wait for the coding information of combo battery core；
The test obtains each first open-circuit voltage OCV1 for waiting for combo battery core, further includes later：Described combo is waited for by each
First open-circuit voltage OCV1 of battery core is corresponded with its coding information；
The test obtains each second open-circuit voltage OCV2 for waiting for combo battery core, further includes before：Scanning obtains each described
Wait for the coding information of combo battery core；
The test obtains each second open-circuit voltage OCV2 for waiting for combo battery core, further includes later：Described combo is waited for by each
Second open-circuit voltage OCV2 of battery core is corresponded with its coding information.
5. multi-series and parallel Li-ion batteries piles dynamic low voltage method for group matching according to claim 2, which is characterized in that described to incite somebody to action
A batch waits for that combo battery core is discharged to predetermined voltage U by loading with scheduled current I, further includes before：
Preset control parameter, control parameter includes the grouping initial value, pre- of △ V either the grouping step value of K, △ V or K
Constant current I, predetermined voltage U, the first predetermined temperature T1, the first predetermined time H1, the second predetermined temperature T2, the second predetermined time
H2。
6. multi-series and parallel Li-ion batteries piles dynamic low voltage method for group matching according to claim 3, which is characterized in that described to incite somebody to action
The consistent multiple battery cores of performance indicator form a batch and wait for combo battery core, specifically include：
According to capacity by multiple battery cores be divided into it is several first, the consistent multiple battery cores of capacity are formed into a batch；Root
Each first is divided into several second batchs according to voltage, the consistent multiple battery cores of voltage are formed into a batch；According to AC impedance
Each second batch is divided into several thirds batch, the consistent multiple battery cores of AC impedance are formed into a batch；According to short time voltage
Each third batch is divided into several 4th batches by storage change value, by the consistent multiple battery core groups of short time voltage storage change value
Combo battery core is waited at a batch.
7. multi-series and parallel Li-ion batteries piles dynamic low voltage method for group matching according to claim 1, which is characterized in that described to incite somebody to action
A batch waits for that combo battery core is discharged to predetermined voltage U by loading with scheduled current I；Wherein, described to wait for that combo battery core is fully charged
State；
Scheduled current I is 0.2/ unit interval of battery core capacity C * for waiting for combo battery core, and predetermined voltage U waits for combo electricity to be described
The blanking voltage of core；
First predetermined temperature T1 is 25 DEG C or 45 DEG C, and it is 48h that the first predetermined time H1 is most short；
It is most short for for 24 hours that second predetermined temperature T2 is equal to the first predetermined temperature T1, the second predetermined time H2.
8. multi-series and parallel Li-ion batteries piles dynamic low voltage method for group matching according to claim 7, which is characterized in that predetermined electricity
Pressure U is 3.0V；First predetermined temperature T1 is 45 DEG C, and the first predetermined time H1 is 72h；Second predetermined time H2 is 72h.
9. a kind of multi-series and parallel Li-ion batteries piles dynamic low voltage combo system, which is characterized in that including battery core bunkerage, battery core
Performance test apparatus；
The battery core bunkerage can control the temperature and time of battery core storage for being stored to battery core；
The battery core performance test apparatus makes battery core be discharged to predetermined voltage U with scheduled current I for providing load.It is additionally operable to
The performance parameter of battery core is detected, performance parameter includes the first open-circuit voltage OCV1 and the second open-circuit voltage OCV2.
10. multi-series and parallel Li-ion batteries piles dynamic low voltage combo system according to claim 9, which is characterized in that also wrap
Include encoding device and scanning device；
The encoding device is ink jet numbering machine, for preparing coding information in battery core；The scanning device is scanner, for sweeping
Retouch the coding information for obtaining battery core；
The multi-series and parallel Li-ion batteries piles dynamic low voltage combo system further includes terminal；The terminal is electrically connected the electricity
Core bunkerage, battery core performance test apparatus and the scanner；The terminal includes setting unit, control unit, sampling list
Member, storage unit and data processing unit；
The setting unit is electrically connected the storage unit；The setting unit is for setting control parameter, and by control parameter
It stores to the storage unit；The control parameter include △ V either K grouping step value, △ V or K grouping initial value,
The pre- timing of scheduled current I, predetermined voltage U, the first predetermined temperature T1, the first predetermined time H1, the second predetermined temperature T2 and second
Between H2；
Described control unit is electrically connected the storage unit, the battery core bunkerage and the battery core performance test apparatus；Institute
Control unit is stated for according to the control parameter in storage unit, controlling the battery core performance test apparatus and the voltage tester
The work of equipment；
The sampling unit is electrically connected the storage unit, battery core performance test apparatus and scanning device；The sampling unit is used
In the coding information and performance parameter of sampling battery core；
The storage unit, for storing coding information, control parameter and performance parameter；
The data processing unit is electrically connected storage unit, and combo is carried out for calculating △ V or K, and according to result of calculation.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111151479A (en) * | 2020-01-02 | 2020-05-15 | 珠海冠宇电池有限公司 | Sorting and matching method for battery cores of lithium ion batteries |
| CN111505513A (en) * | 2020-04-29 | 2020-08-07 | 广东力科新能源有限公司 | Cell K value testing method and cell K value testing system thereof |
| CN112354897A (en) * | 2020-07-22 | 2021-02-12 | 万向一二三股份公司 | Screening method for cell consistency in practical application process of lithium ion battery |
| CN112421031A (en) * | 2020-11-24 | 2021-02-26 | 宁德新能源科技有限公司 | Electrochemical device and electronic device |
| CN113533981A (en) * | 2021-07-30 | 2021-10-22 | 蜂巢能源科技有限公司 | Lithium ion battery self-discharge detection method and device and computer readable storage medium |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102760907A (en) * | 2011-04-29 | 2012-10-31 | 广州丰江电池新技术股份有限公司 | Method for assembling rechargeable lithium battery pack |
| CN105304954A (en) * | 2015-09-30 | 2016-02-03 | 东莞市致格电池科技有限公司 | Battery grouping method and battery grouping system |
| CN107579298A (en) * | 2017-09-06 | 2018-01-12 | 江苏海四达电源股份有限公司 | Lithium ion battery grouping method |
-
2018
- 2018-04-11 CN CN201810322574.9A patent/CN108539299A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102760907A (en) * | 2011-04-29 | 2012-10-31 | 广州丰江电池新技术股份有限公司 | Method for assembling rechargeable lithium battery pack |
| CN105304954A (en) * | 2015-09-30 | 2016-02-03 | 东莞市致格电池科技有限公司 | Battery grouping method and battery grouping system |
| CN107579298A (en) * | 2017-09-06 | 2018-01-12 | 江苏海四达电源股份有限公司 | Lithium ion battery grouping method |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111151479A (en) * | 2020-01-02 | 2020-05-15 | 珠海冠宇电池有限公司 | Sorting and matching method for battery cores of lithium ion batteries |
| CN111505513A (en) * | 2020-04-29 | 2020-08-07 | 广东力科新能源有限公司 | Cell K value testing method and cell K value testing system thereof |
| CN112354897A (en) * | 2020-07-22 | 2021-02-12 | 万向一二三股份公司 | Screening method for cell consistency in practical application process of lithium ion battery |
| CN112354897B (en) * | 2020-07-22 | 2022-04-12 | 万向一二三股份公司 | Screening method for cell consistency in practical application process of lithium ion battery |
| CN112421031A (en) * | 2020-11-24 | 2021-02-26 | 宁德新能源科技有限公司 | Electrochemical device and electronic device |
| CN112421031B (en) * | 2020-11-24 | 2022-04-05 | 宁德新能源科技有限公司 | Electrochemical device and electronic device |
| CN113533981A (en) * | 2021-07-30 | 2021-10-22 | 蜂巢能源科技有限公司 | Lithium ion battery self-discharge detection method and device and computer readable storage medium |
| WO2023005436A1 (en) * | 2021-07-30 | 2023-02-02 | 蜂巢能源科技股份有限公司 | Lithium-ion battery self-discharge detection method and device, and computer-readable storage medium |
| CN113533981B (en) * | 2021-07-30 | 2024-01-26 | 蜂巢能源科技有限公司 | Lithium ion battery self-discharge detection method, equipment and computer readable storage medium |
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