CN110350261A - Lithium ion battery grouping method - Google Patents
Lithium ion battery grouping method Download PDFInfo
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- CN110350261A CN110350261A CN201910669655.0A CN201910669655A CN110350261A CN 110350261 A CN110350261 A CN 110350261A CN 201910669655 A CN201910669655 A CN 201910669655A CN 110350261 A CN110350261 A CN 110350261A
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- battery
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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
- H01M10/04—Construction or manufacture in general
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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
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging 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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/448—End of discharge regulating measures
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention discloses a kind of lithium ion battery grouping method, include the following steps: that (1) is fully charged by n single battery, is then divided into N batches；(2) N in (1) batches of single batteries are subjected to discharged in series respectively, are discharged to electric discharge end, and record the voltage V after each single battery electric discharge；(3) N in (2) batches of single batteries are subjected to series connection supplement electricity respectively, or individually connects again after electric discharge completely and supplements electricity；(4) each batch of single battery is carried out combo, obtains N number of battery pack by the voltage V measured according to (2)；(5) the N number of battery pack of gained is connected.The present invention carries out conformity classification using the method for series-connection charge-discharge, so that discharged in series voltage is compared on the same benchmark every time, has the characteristics that simply, quickly and effectively.The different adjustment production technologies of conformance requirement when this method can also be applied according to battery pack, so that battery consistency is higher；Parameter is simply convenient for operation to grasp when combo.
Description
Technical field
The present invention relates to technical field of lithium ion, in particular to lithium ion battery grouping method.
Background technique
Large-scale lithium ion battery is widely used in fields such as energy storage, electric bus in recent years, and the energy content of battery is few then up to a hundred
KWH, more then thousands of kWH up to ten thousand, it is desirable that battery series and parallel quantity it is more and more.Battery with two side terminals also becomes most important
Problem.Because each battery core parameter has difference, working condition can all be had differences, can be to battery if be not controlled
There is the problem of damaging and causing safety；But if controlling, capacity cannot all be brought into play again.
Traditional method for group matching needs go to be matched according to parameters such as battery capacity, internal resistance, voltage drops, even need sometimes
Second of matching is carried out after carrying out volume test to the battery pack after combo, it is complicated for operation, and also effect has limitation, than
Such as: measurement error.For domestic current measurement error 1% or so, this error is not able to satisfy market to power battery completely
Demand.
Traditional method for group matching standard is difficult to control, and strictly then battery utilization rate is low for standard, and the then battery that debases the standard is consistent
Property it is poor, influence battery use when whole volume, battery life and safety are also adversely affected.Using conventional method combo
When the parameter to be considered it is more, and need according to actual operating conditions to determine major parameter, be unfavorable for enterprise's production practical operation.
In addition, general discharged in series method for group matching is limited by the voltage of charging/discharging apparatus can not preferably be used in large-sized battery pack
In combo.Currently, being badly in need of a kind of simple, quickly and effectively method for group matching for improving battery consistency in the market.
Summary of the invention
The present invention provides a kind of lithium ion battery grouping method, be able to solve one of above-mentioned prior art problem or
It is several.
According to an aspect of the invention, there is provided lithium ion battery grouping method, comprising the following steps:
(1) n single battery is fully charged, then it is divided into N batches；
(2) N in (1) batches of single batteries are subjected to discharged in series respectively, are discharged to electric discharge end, and record each monomer
Voltage V after battery discharge；
(3) N in (2) batches of single batteries are subjected to series connection supplement electricity respectively；
(4) the voltage V of single battery is measured according to step (2), and the single battery in each batch is subjected to combo respectively, obtains N
A battery pack；
(5) the N number of battery pack of gained is connected.
It is first that single battery is fully charged as a result, then discharged in series, terminate to put when being discharged to electric discharge end fixed capacity
Electricity, so that discharged in series voltage is compared on the same benchmark every time, gained battery charging end is consistent, and institute
The consistency for obtaining single battery is high, and the battery of each secondary discharged in series can be used in a battery pack, is suitble to large-sized battery pack
Combo.Lithium ion battery combo should be carried out in this way, it is only necessary to measuring a voltage value can be carried out the matching of battery,
Simplify battery combo process.
In some embodiments, it also needs to carry out preliminary screening to single battery before step (1).Thus, it is possible to
Guarantee the quality of the single battery of progress combo, it is ensured that battery with two side terminals.
In some embodiments, the specification of n single battery is identical in lithium ion battery combo.Single battery as a result,
Between difference it is smaller, facilitate combo.
In some embodiments, further include following steps before step (3): will be gone here and there in step (2) resulting each batch
The single battery that connection is discharged to electric discharge end is individually discharged to final voltage.Gained single battery electric discharge end one as a result,
It causes, can satisfy different demands.
In some embodiments, the electricity of step (3) series connection supplement electricity can float.Thus, it is possible to carry out according to demand
Adjustment, series connection supplement power consumption is 50%SOC under normal circumstances.
In some embodiments, the method for combo is as follows in step (4): rejecting the monomer electricity of voltage dispersion in each batch
Pond, and each batch of residual monomer battery is subjected to series connection or/and parallel connection.The single battery for rejecting voltage dispersion as a result, guarantees remaining
The voltage and capacitance difference of single battery are little, battery with two side terminals enhancing.It can be by the voltage of single battery by parallel connection
Difference reduces, to further increase battery consistency.
In some embodiments, in a collection of single battery, a single battery and p single battery are carried out simultaneously
Connection, obtains a parallel units；There can be M parallel units in each batch.Parallel units are formed by way of in parallel as a result, thus
The difference for reducing voltage value between battery, further increases battery consistency.
In some embodiments, p >=1.One single battery and one or more single batteries can be in parallel,
Two and unit are obtained, or obtains three and unit, four and more simultaneously units such as unit.
The voltage V single battery for being higher than average value can be lower than with a voltage V in same a collection of single battery
The single battery of average value carries out parallel connection, obtains two and unit.One or more voltage V can also be higher than to the monomer of average value
Battery is in parallel with one or more voltage sub-average single battery progress of V, obtains more and unit.
Voltage V can be selected in single cells and differs maximum two progress parallel connection, and is continued in residual monomer battery
In select voltage V to differ maximum two progress in parallel, so by multiple repetitions, so that it may obtain two similar in multiple voltage values
And unit, and the voltage of remaining single battery and the mean difference of all monomer voltages are little, and with and receipts or other documents in duplicate
The voltage difference of member is also little.
In some embodiments, M is natural number.When the voltage V of same a collection of single battery is not much different, satisfaction production adds
When requirement during work to battery consistency, this batch of single battery can all be connected, at this time M=0.When same a batch
It, can be by way of in parallel by the partial monosomy electricity when voltage V deviation in single battery there are partial monosomy battery is larger
The difference of pond and remaining single battery reduces, to improve battery with two side terminals, M >=1 at this time.
In some embodiments, N >=1, it can carry out a batch or more batches of combos.The monomer electricity that each batch combo obtains
The consistency in pond is higher, can be attached combination.The equipment for being generally used for being discharged in series and parallel has voltage limitation, if
Series-connected cell quantity is more, can exceed the voltage range of equipment.The number of batteries needed in large-sized battery pack is more, may exceed
The range of equipment.Thus, it is possible to according to demand and the limitation of the voltage of equipment is conducted batch-wise charge and discharge, then will each batch of battery progress
Assembling.
Detailed description of the invention
Fig. 1 is the step flow chart of the lithium ion battery grouping method of an embodiment of the present invention.
Specific embodiment
The invention will now be described in further detail with reference to the accompanying drawings.
Fig. 1 schematically shows a kind of the step of lithium ion battery grouping method of embodiment according to the present invention stream
Journey.
The present embodiment configuration electric discharge terminal voltage is very poor≤Li-ion batteries piles of 250mV, the voltage limit of charging/discharging apparatus
It is made as 500V.Concrete configuration method is as follows:
(1) preliminary screening
Same specification, single battery 256 of quality qualification are selected, is randomly divided into two batches, 128 batteries of every batch of, and compile
Number.
(2) two batches single battery is fully charged.
(3) two batches battery is subjected to discharged in series respectively, discharge capacity 103Ah is discharged to electric discharge end, records each
Voltage V after single battery electric discharge, as shown in table 1.
(4) data processing
The battery of voltage dispersion in two batches battery is rejected, and two batches battery is sorted from low to high according to voltage, such as 2 institute of table
Show.Wherein, V61, V30, V41, V98, V1 ', V8 ' and V9 ' due to discrete type it is poor, be removed.
(5) each single battery in two batches battery is individually discharged to final voltage.
(6) two batches battery is connected respectively and supplements electricity to 50%SOC.
(7) combo is carried out according to the voltage V after the electric discharge of each single battery, method for group matching is as follows:
(a) two batches single battery is ranked up from low to high according to voltage V respectively, as shown in table 2.
(b) in the 1st batch of single battery, the maximum two single battery parallel connections of voltage phase difference are obtained into parallel units, i.e. V88
And voltage height low with V37 discharged in series terminal voltage, which is arranged in pairs or groups, constitutes one two and unit in practical application；In remaining monomer
The maximum two single batteries parallel connection of voltage phase difference is selected in monomer and obtains second parallel units, i.e. V73 and V34 constitute practical
One two and unit in.The 1st batch of discharged in series unit of collocation, which is carried out, with this rule constitutes 62 two and unit.2nd batch
Single battery carries out combo in the way of the 1st batch, also constitutes 62 two and unit, as shown in table 3.
Lithium ion battery grouping method obtained by the present embodiment is as shown in table 4.Wherein, single battery is in parallel two-by-two, and 120 two
And unit is connected, the voltage dispersion electricity of V14 ' and rejecting in extra battery unit 121,122,123,124 and the 2 crowdes
The discharged in series that can be participated in after pond is fully charged next time continues with.
In addition, in other embodiments can also be in parallel by three or more single batteries, form different combo modes.
By taking the 1st batch of battery as an example, method for group matching is as follows:
(a) the 1st batch of single battery is ranked up from low to high according to voltage V, and by single battery be divided into low-pressure area, in
Pressure area and the subregion of higher-pressure region three, as shown in table 5.
(b) in the 1st batch of single battery, by voltage V highest in voltage V in low-pressure area minimum single battery V88, higher-pressure region
Single battery V37 and middle pressure area in any one single battery (selecting V76 herein) carry out in parallel, obtain one three and single
First (V88, V37, V76).Successively according to this rule in remaining single battery, by the monomer electricity that voltage V in low-pressure area is minimum
Any one single battery (selecting V68 herein) in pond V73, higher-pressure region in the highest single battery V34 of voltage V and middle pressure area
Parallel connection is carried out, second three and unit (V73, V34, V49) are obtained.It is successively carried out according to this rule in remaining single battery
Combo obtains 42 three and unit and a single battery, as shown in table 6.
Further, it is also possible to the parallel units of parallel connection serial number 61 and 62 shown in table 3 are adjusted, remaining two and unit
It is constant.V16, V52, V49 in 1st crowd are subjected to parallel connection, and V70 is rejected, obtains one three and unit, i.e. first monomer electricity
Pond obtains 60 two simultaneously unit and one three and units through combo.
In another example can also be in parallel with V70 progress by V16, V52, V49 in the 1st crowd, remaining single battery according to table 3 into
Row two and unit combination obtain one four simultaneously unit and 60 two and unit.
Further, it is also possible to only carry out parallel combination to partial monosomy battery.For example, in the first embodiment by the 2nd
V84 ' and V75 ' in crowd are also rejected, and V69 ' and V62 ' be without parallel combination, remaining monomeric unit is according to shown in table 3
Two and unit connection are carried out, so that the 2nd batch of single battery obtains 60 parallel units and 3 single batteries.As known from Table 4,
V69 ' and V62 ' with the 2nd batch in remaining 60 two and unit voltage differences it is smaller.V14 ' is also rejected, the 2nd batch of monomer electricity
Pond obtains 60 two and unit and 3 single batteries by combo, it is ensured that consistency is high between gained battery pack.
The voltage V of 1 single battery of table
Table 2 sorts according to voltage V height
Table 3 two and unit
4 lithium ion battery combo scheme (one) of table
The 1st batch of single battery sequence of table 5 and partitioning scenario
Table 6 three and unit combo scheme
According to above-mentioned lithium ion battery combo scheme, it is only necessary to refer to a parameter, i.e. voltage value after discharged in series, gained
Single battery consistency it is high, voltage between battery is very poor to be less than 250mV；Method for group matching is simple, it is only necessary to measure a ginseng
Number, convenient for operation.Such as if it is desired to which end of charging is consistent, then can be omitted step (5), remaining step and above embodiment phase
Together.
Above-described is only some embodiments of the present invention.For those of ordinary skill in the art, not
Under the premise of being detached from the invention design, various modifications and improvements can be made, these belong to protection model of the invention
It encloses.
Claims (8)
1. lithium ion battery grouping method, which comprises the following steps:
(1) n single battery is fully charged, then it is divided into N batches；
(2) N in (1) batches of single batteries are subjected to discharged in series respectively, are discharged to electric discharge end, and record each single battery
Voltage V after electric discharge；
(3) N in (2) batches of single batteries are subjected to series connection supplement electricity respectively；
(4) single battery in each batch is carried out combo respectively, obtained N number of by the voltage V of the single battery measured according to step (2)
Battery pack；
(5) the N number of battery pack of gained is connected.
2. lithium ion battery grouping method according to claim 1, which is characterized in that also need before the step (1) pair
Single battery carries out preliminary screening.
3. lithium ion battery grouping method according to claim 2, which is characterized in that the n single battery specification phase
Together.
4. lithium ion battery grouping method according to claim 1, which is characterized in that before the step (3) further include with
Lower step:
Single battery in step (2) resulting each batch is individually discharged to final voltage.
5. lithium ion battery grouping method according to claim 1, which is characterized in that the method for step (4) described combo
It is as follows:
The single battery of voltage dispersion in each batch is rejected, and each batch of residual monomer battery is subjected to series connection or/and parallel connection.
6. lithium ion battery grouping method according to claim 5, which is characterized in that in same a batch single battery, by one
A single battery is in parallel with p single battery progress, obtains a parallel units；There can be M parallel units in each batch.
7. lithium ion battery grouping method according to claim 6, which is characterized in that p >=1, M are natural number.
8. lithium ion battery grouping method according to claim 1, which is characterized in that N >=1.
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Cited By (1)
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| CN111029668A (en) * | 2019-11-25 | 2020-04-17 | 江西恒动新能源有限公司 | Matching method of lithium ion power batteries |
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