CN107579298A - Lithium ion battery grouping method - Google Patents
Lithium ion battery grouping method Download PDFInfo
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- CN107579298A CN107579298A CN201710793791.1A CN201710793791A CN107579298A CN 107579298 A CN107579298 A CN 107579298A CN 201710793791 A CN201710793791 A CN 201710793791A CN 107579298 A CN107579298 A CN 107579298A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- 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
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Abstract
The present invention relates to technical field of lithium ion, and more particularly to lithium ion battery grouping method, the method for the lithium ion battery grouping method is:Multiple discharge and recharge is carried out to multiple lithium ion batteries under the conditions of different discharge and recharges, and the charging capacity extreme difference of survey calculation charge and discharge process, the internal resistance of discharge capacity extreme difference, open-circuit voltage, self-discharge value and battery, multiple lithium ion batteries are screened, qualified lithium ion battery is subjected to combo, to form battery pack.Screening of the invention by the way that lithium ion battery to have been carried out to combo condition under different electricity, so that making the monomer lithium ion battery in same group small with monomer lithium ion battery voltage pole extreme difference in group at the end moment of heavy-current discharge after screening, the uniformity of lithium-ion electric tank discharge is improved.
Description
Technical field
The present invention relates to technical field of lithium ion, more particularly to lithium ion battery grouping method.
Background technology
Application of the lithium ion battery as new energy technology in daily life is more and more extensive, be related to Aero-Space,
The fields such as mobile base station energy storage, electric tool, small household appliances, smart home, digital 3C, electric automobile.People are in lithium ion battery
In research and development to the specific energy of monomer lithium ion, energy density per unit volume, high rate performance, high/low temperature discharge performance, cycle life, from
The performance requirement more and more highers such as electric discharge；But often by after monomer lithium ion battery combo in the practice of every field
Use in groups, the performance of assembling lithium ion battery bag is not only closely related with cell performance, also simultaneously by lithium in same group from
Sub- battery with two side terminals influences.Influence due to always having some uncontrollable factors during procedure for producing causes lithium ion list
Body battery consistency has that extreme difference is different, and discharge and recharge and single branch battery charging condition are carried out after lithium ion single battery pack synthesis module
Have larger extreme difference different, occur voltage extreme difference in charge and discharge process in module between cell, heavy-current discharge end it is each
Voltage pole difference between cell is maximum, so optimize in process of production, improve combo technique, improves after combo lithium in groups
The battery consistency of ion is particularly critical.
The content of the invention
For lithium-ion battery monomer in battery pack present in prior art in heavy-current discharge, the electricity of cell
The defects of extreme difference difference is big, and battery discharge is uneven is pressed, the present invention provides a kind of uniformity for improving lithium-ion electric tank discharge
Battery grouping method.
Inventor has found that lithium ion battery is existing by progress UN38.3 tests during the present invention is realized
Lithium ion battery grouping method be typically under higher SOC states by judge lithium ion single battery electric discharge hold
The factors such as amount, voltage carry out combo, do not account for capacity attenuation during battery follow-up dispatch from the factory transport, use, no
It is different big with single battery core capacity extreme difference under SOC, exist electric discharge it is inconsistent the problems such as.
In view of the above-mentioned problems, the present invention provides a kind of lithium ion battery grouping method, comprise the following steps：
First voltage threshold value is charged to each lithium ion battery in multiple lithium ion batteries, record each lithium from
First charging capacity C of sub- battery1, and calculate the first charging capacity extreme difference Δ C of multiple lithium ion batteries1；
The first charging capacity extreme difference Δ C is selected from the multiple lithium ion battery1Lithium in the first preset range from
Sub- battery；
Each lithium ion battery in selected lithium ion battery is discharged to second voltage threshold value, selected by record
Each lithium ion battery the first discharge capacity C2, and calculate the first discharge capacity of selected multiple lithium ion batteries
Extreme difference Δ C2；
Second of the first discharge capacity extreme difference Δ C of selection from selected lithium ion battery2In the second preset range
Lithium ion battery；
Each lithium ion battery in the lithium ion battery of second of selection is charged into the first electricity S1, shelve one section
First open-circuit voltage OCV of each lithium ion battery of second of selection of measurement after time1, then shelve very first time t1Afterwards
The second open-circuit voltage OCV of each lithium ion battery of second of selection of measurement under temperature T2, and calculate second and select
Each lithium ion battery the first self-discharge value K1With the second open-circuit voltage extreme difference Δ OCV2；
K is selected for the third time from the lithium ion battery of second of selection1Value is in the 3rd preset range and the second open circuit is electric
Press extreme difference Δ OCV2Lithium ion battery in the 4th preset range；
K is selected for the third time from the lithium ion battery of second of selection1It is worth the lithium ion battery in the 3rd preset range；
Each lithium ion battery in the lithium ion battery of third time selection is discharged to second voltage threshold value, record the
Second discharge capacity C of each lithium ion battery selected three times3, and calculate multiple lithium ion batteries of third time selection
The second discharge capacity extreme difference Δ C3；
The 4th the second discharge capacity extreme difference Δ C of selection from the lithium ion battery of third time selection3In the 5th predetermined model
Enclose interior lithium ion battery；
Each lithium ion battery in the lithium ion battery of 4th selection is charged into the second electricity S2, then by
Each lithium ion battery of four selections is discharged to second voltage threshold value, records each lithium ion battery of the 4th selection
The 3rd discharge capacity C4, and calculate the discharge capacity extreme difference Δ C of multiple lithium ion batteries the 3rd of the 4th selection4；
The 5th the 3rd discharge capacity extreme difference Δ C of selection from the lithium ion battery of the 4th selection4In the 6th predetermined model
Enclose interior lithium ion battery；
Each lithium ion battery in the lithium ion battery of 5th selection is charged into the second electricity S2, shelve one section
The 3rd open-circuit voltage OCV of each lithium ion battery of the 5th selection is measured after time3, then shelve the second time t2Afterwards
Measure the 4th open-circuit voltage OCV of each lithium ion battery of the 5th selection4With internal resistance IR, and calculate the 5th time selection
Second self-discharge value K of each lithium ion battery2, the 4th open-circuit voltage extreme difference Δ OCV4With internal resistance extreme difference Δ IR；
The 6th selection K from the lithium ion battery of the 5th selection2Value is in the 7th preset range and the 4th open circuit is electric
Press extreme difference Δ OCV4In the 8th preset range and lithium ion batteries of the internal resistance extreme difference Δ IR in the 9th preset range；
The lithium ion battery of 6th selection is subjected to combo, to form battery pack.
Preferably, first preset range is 0 to the 3% of lithium battery rated capacity.
Preferably, second preset range is 0 to the 1% of lithium battery rated capacity.
Preferably, it is described to put the first discharge capacity C2Scope be lithium battery rated capacity 100% to 108%.
Preferably, the K1Calculation formula be：K1=(OCV1-OCV2)/t1。
Preferably, the 3rd preset range is 0 to 1mV/h.
Preferably, the 4th preset range is 0 to 3mV.
Preferably, the first electricity S1Scope be SOC 70% to 100%.
Preferably, the t1Scope be 2 to 5 days.
Preferably, the scope of the T is 50 to 60 DEG C.
Preferably, the OCV2The scope of pole extreme difference is 0 to 3mV.
Preferably, the 5th preset range is 0 to the 1% of lithium battery rated capacity.
Preferably, the 6th preset range is 0 to the 0.5% of lithium battery rated capacity.
Preferably, the K2Calculation formula be：K2=(OCV3-OCV4)/t2。
Preferably, the 7th preset range is 0 to 0.05mV/h.
Preferably, the 8th preset range is 0 to 3mV.
Preferably, the 9th preset range is 0 to 1m Ω.
Preferably, the second electricity S2Scope be SOC 25% to 30%.
Preferably, the t2Scope be 10 to 15 days.
Preferably, it is further comprising the steps of before combo is carried out to battery：The lithium ion battery for treating combo is put with first
Electric multiplying power CABlanking voltage is discharged to, again with the second discharge-rate c after standing certain timeBIt is discharged to blanking voltage, wherein CA>
CB。
Preferably, the first discharge-rate CAScope be 0.33C to 0.5C.
Preferably, the second discharge-rate CBScope be 0.05C to 0.2C.
Pass through above-mentioned technical proposal, the present invention is by the way that under the conditions of different SOC, combo condition has been carried out to lithium ion battery
Screening, constantly reduce the discharge and recharge difference between multiple lithium batteries in same battery pack so that make the list in same group after screening
Body lithium ion battery is small with monomer lithium ion battery voltage pole extreme difference in group at the end moment of heavy-current discharge, and electric discharge is more filled
Point, depth of discharge is consistent, avoids single branch battery and overcharges for a long time, crosses situations such as putting, improves the consistent of lithium-ion electric tank discharge
Property.
The further feature and advantage of the embodiment of the present invention will be described in detail in subsequent specific embodiment part.
Brief description of the drawings
Accompanying drawing is that the embodiment of the present invention is further understood for providing, and a part for constitution instruction, with
The embodiment in face is used to explain the embodiment of the present invention together, but does not form the limitation to the embodiment of the present invention.Attached
In figure：
Fig. 1 is the flow chart of lithium ion battery grouping method according to an embodiment of the present invention；
Fig. 2 is the flow chart of lithium ion battery grouping method according to an embodiment of the present invention.
Embodiment
The embodiment of the embodiment of the present invention is described in detail below in conjunction with accompanying drawing.It should be appreciated that this
The embodiment of place description is merely to illustrate and explain the present invention embodiment, is not intended to limit the invention embodiment.
The present invention is by being screened to multiple lithium ion batteries, by the lithium-ion electric with compared with high charge-discharge uniformity
For pond monomer with composition lithium battery group, multiple lithium ion batteries selected by the present invention have identical theoretical capacity C.
Charging capacity extreme difference Δ C=C in the present inventionmax-Cmin, wherein after for charging, CmaxFor the maximum of lithium battery in same group
Charging capacity, CminFor the minimum charging capacity of lithium battery in same group.
Discharge capacity extreme difference Δ C=C in the present inventionmax-Cmin, wherein after for charging, CmaxFor the maximum of lithium battery in same group
Discharge capacity, CminFor the minimum discharge capacity of lithium battery in same group.
Discharge-rate in the present inventionWherein I be lithium battery discharge current, CIt is specifiedIt is the specified appearance of lithium battery
Amount.
The present invention by extreme difference screen lithium ion battery method be：If the extreme difference of a certain item parameter of battery is not predetermined
In the range of, then by the Range-partition of the parameter into multiple continuous and less scopes of scope identical, by parameter values same
Battery in smaller range carries out combo.The segmentation of wherein number range is determined according to species, the model of battery.
Fig. 1 is the flow chart of lithium ion battery grouping method according to an embodiment of the present invention.In order to improve in same group
A kind of uniformity of lithium ion battery discharge and recharge, as shown in figure 1, in one embodiment of the present invention, there is provided lithium-ion electric
Pond method for group matching.Specifically, this method may comprise steps of：
In step sl, first voltage threshold is charged to each lithium ion battery in multiple lithium ion batteries first
Value, record the first charging capacity C of each lithium ion battery1, and calculate the first charging capacity pole of multiple lithium ion batteries
Poor Δ C1.First voltage threshold value can be adjusted according to the model of lithium battery, in an embodiment of the invention, the threshold
Value may, for example, be 4.2V, but it will be appreciated by those skilled in the art that the threshold value can select other any appropriate values.
In step s 2, the first charging capacity extreme difference Δ C is selected in the multiple lithium ion batteries tested from step S11
Lithium ion battery in first preset range, the first preset range can be 0 to the 3% of lithium battery rated capacity, if first
Charging capacity extreme difference Δ C1Not within the predefined range, then ineligible lithium battery is rejected.
In step s3, the lithium ion battery that the method according to step S2 screens to obtain is charged into second voltage threshold value,
Then the first discharge capacity C of each lithium ion battery is recorded2, and calculate the first of selected multiple lithium ion batteries and put
Capacitance extreme difference Δ C2.Second voltage threshold value can be adjusted according to the model of lithium battery, in one embodiment of the present invention
In formula, the threshold value may, for example, be 2.75V, but it will be appreciated by those skilled in the art that the threshold value can select other any appropriate
Value.
In step s 4, the first discharge capacity extreme difference Δ C is selected in the multiple lithium ion batteries tested from step S32
Lithium ion battery in second preset range, the second preset range can be 0 to the 1% of lithium battery rated capacity, if first
Discharge capacity extreme difference Δ C2Not within the predefined range, then ineligible lithium battery is rejected.
In one embodiment of the present invention, the first discharge capacity C2Scope 100% arriving for lithium battery rated capacity
108%, in order to reduce the electric discharge difference of multiple lithium ion batteries in same group, the discharge capacity of lithium battery in same group can be decomposed
Into 4 or 8 continuous and scope identicals compared with low capacity scope, such as 2,4,8.
In step s 5, the lithium ion battery that the method according to step S4 screens to obtain is charged into the first electricity S1, put
Put the first open-circuit voltage OCV that each lithium ion battery is measured after a period of time1, then shelve very first time t1Afterwards in temperature T
Lower the second open-circuit voltage OCV for measuring each lithium ion battery2, and calculate the first self-discharge value of each lithium ion battery
K1With the second open-circuit voltage extreme difference Δ OCV2。
In one embodiment of the present invention, the first electricity S1Scope can be the 70% to 100% of SOC, in this SOC
The otherness of battery is easier to display under state.In the present invention before the first open-circuit voltage of measurement battery, battery is existed
A period of time is shelved under room temperature condition, is advantageous to improve the stability of battery, the time shelved can be carried out according to actual conditions
Adjustment, such as can be 1 day.
Before the second open-circuit voltage of measurement battery, battery is shelved into very first time t under temperature T1, wherein temperature T's
Scope is 50 to 60 DEG C, in the temperature range, can accelerate the self discharge of battery, shorten the testing time, wherein the very first time
T1Scope can be 2 to 5 days.
In step s 5, the first self-discharge value K of each lithium ion battery is calculated by battery1Lithium ion battery is entered
Row further screening, K1Calculation formula be：K1=(OCV1-OCV2)/t1。
In step s 6, K is selected in the multiple lithium ion batteries tested from step S51Value in the 3rd preset range and
Second open-circuit voltage extreme difference Δ OCV2Lithium ion battery in the 4th preset range, the 3rd preset range can 0 arrive 1mV/
H, the 4th preset range can 0 arrive 3mV.If the K of some lithium ion battery1Value or Δ OCV2In it is any one or more
Not within the predefined range, then the lithium ion battery does not meet combo condition, should reject.
In the step s 7, the lithium ion battery that the method according to step S6 screens to obtain is discharged to second voltage threshold value,
And record the second discharge capacity C of each lithium ion battery3, and calculate the second discharge capacity pole of multiple lithium ion batteries
Poor Δ C3。
In step s 8, the second discharge capacity extreme difference Δ C is selected in the multiple lithium ion batteries tested from step S73
Lithium ion battery in 5th preset range, the 5th preset range can be 0 to the 1% of lithium battery rated capacity, if second
Discharge capacity extreme difference Δ C3Not within the predefined range, then ineligible lithium battery is rejected.
In step s 9, the lithium ion battery that the method according to step S8 screens to obtain is charged into the second electricity S2, so
Each lithium ion battery is discharged to second voltage threshold value afterwards, records the 3rd discharge capacity C of each lithium ion battery4,
And calculate multiple discharge capacity extreme difference Δ C of lithium ion battery the 3rd4。
In step slo, the 3rd discharge capacity extreme difference Δ C in the multiple lithium ion batteries tested from step S94
Lithium ion battery in six preset ranges, the 6th preset range are 0 to the 0.5% of lithium battery rated capacity, if the second electric discharge
Capacity extreme difference Δ C4Not within the predefined range, then ineligible lithium battery is rejected.
In step s 11, the lithium ion battery that the method according to step S8 screens to obtain is charged into the second electricity S2, with
After shelve the second time t2The 4th open-circuit voltage OCV of each lithium ion battery of the 5th selection is measured afterwards4With internal resistance IR,
And calculate the second self-discharge value K of each lithium ion battery of the 5th selection2, the 4th open-circuit voltage extreme difference Δ OCV4With it is interior
Hinder extreme difference Δ IR.
In one embodiment of the present invention, the second electricity S2Scope can be the 25% to 30% of SOC, this SOC shape
State, which meets, transports standard specified in UN38.3, while carries out secondary discrimination, improves combo battery consistency.Surveyed in the present invention
Before the 3rd open-circuit voltage for measuring battery, battery is shelved to a period of time at ambient temperature, is advantageous to improve the stability of battery,
The time shelved can be adjusted according to actual conditions, such as can be 1 day.
Before the 4th open-circuit voltage of measurement battery, battery is shelved into very first time t under temperature T2, wherein temperature T's
Scope is 50 to 60 DEG C, in the temperature range, can accelerate the self discharge of battery, reduce testing time, the wherein very first time
t2Scope can be 10 to 15 days.
In step s 11, the second self-discharge value K of each lithium ion battery is calculated by battery2To lithium ion battery
Further screened, K2Calculation formula be：K2=(OCV3-OCV4)/t2。
In step s 12, K is selected in the multiple lithium ion batteries tested from step S112Value is in the 7th preset range
And the 4th open-circuit voltage extreme difference Δ OCV4In the 8th preset range and lithiums of the internal resistance extreme difference Δ IR in the 9th preset range
Ion battery；7th preset range can 0 arrive 0.05mV/h, and the 8th preset range can 0 arrive 3mV, the 9th preset range
Can 0 arrive 1m Ω；If the K of some lithium ion battery2Value, Δ OCV4With any one in Δ IR not within the predefined range,
Then lithium ion battery does not meet combo condition, should reject.
In step s 13, the lithium ion battery for screening to obtain according to step S12 method is subjected to combo, to form electricity
Pond group.
In an embodiment of invention, the charging modes of lithium battery are the charging of constant current constant voltage, electric current during charging
It can be adjusted with voltage according to the model of lithium battery and the test request of reality.
In yet another embodiment of the present invention, the discharge mode of lithium battery is constant current discharge, and the electric current of electric discharge can
It is adjusted with the test request of the model according to lithium battery and reality.
In one embodiment of the present invention, for the stability of battery charging and discharging, the charging process of lithium battery and electric discharge
Process is carried out at 20 to 26 DEG C.
In one embodiment of the present invention,, will before being charged to battery in order to increase the stability of battery charging
Battery is shelved 10~30 minutes.
Fig. 2 is the flow chart of the lithium ion battery grouping method of an embodiment of the present invention of basis.In order to improve same group
A kind of uniformity of interior lithium ion battery discharge and recharge, as shown in Fig. 2 in one embodiment of the present invention, there is provided lithium ion
Battery grouping method.Specifically, this method may comprise steps of：
It is further comprising the steps of before combo is carried out to battery：The lithium ion battery of combo will be treated with the first discharge-rate
CABlanking voltage is discharged to, again with the second discharge-rate C after standing certain timeBIt is discharged to blanking voltage, wherein CA>CB。
After battery is discharged to blanking voltage by high current method, a small amount of electricity is often also deposited after a period of time is shelved
Amount, in order that battery is fully placed on, in the present invention after high-rate battery discharge, battery cut-off a period of time is being subjected to small electricity
Banish electricity.The discharge current of lithium ion battery can be adjusted according to the model of lithium battery and the testing requirement of reality,
In one embodiment of the present invention, the first discharge-rate CAScope be 0.33C to 0.5C；Second discharge-rate CBScope be
0.05C to 0.2C.
Embodiment 1
For the implementation case selection 2000mAh ternary electrokinetic cell as lithium ion single battery, block combiner uses 1 simultaneously
The combination of 6 strings, specific combo step are as follows：
S1：By 10 lithium ion single batteries with 0.8A current discharge to 2.75V, shelve after 10min with 0.15A electricity
Stream is discharged to 2.75V；
S2：After completing step S1, lithium ion battery is shelved into 30min, with 1A electric current constant-current constant-voltage charging to 4.2V, note
Record the first charging capacity C1, the first charging capacity extreme difference Δ C of 10 lithium-ion battery monomers is calculated1For 24mAh；
S3：First charging capacity extreme difference is in preset range 30mAh, so under lithium-ion battery monomer 1~10 enters
One step；
S4：After completing step S3, lithium ion battery is shelved into 10min, with 2A electric current constant-current discharge to 2.75V, record
First discharge capacity C of 10 lithium-ion battery monomers2, the first discharge capacity extreme difference Δ C is calculated2For 22mAh；
S5：First discharge capacity extreme difference Δ C2Not in preset range 20mAh, the 1st, the 4th and the 5th lithium-ion electric is rejected
Pond monomer, the 2nd, 3,6~10 lithium-ion battery monomer enter in next step；
S6：After completing step S5, lithium ion battery is shelved into 30min, with the electricity of 1A electric current constant-current constant-voltage charging 80%
Amount, normal temperature shelf survey the first open-circuit voltage OCV in 1 day1, the second open-circuit voltage extreme difference Δ is surveyed after then being shelved at 55 DEG C 4 days
OCV2, and calculate the first self-discharge value K1；
S7：First self-discharge value K of the 2nd, 3,6~10 lithium-ion battery monomer lithium-ion battery monomer1Predetermined
In scope 1mV/h, but the second open-circuit voltage extreme difference Δ OCV2Not within the predefined range, the 6th lithium ion battery is sifted out, the 2nd,
3rd, 7~10 lithium-ion battery monomers enter in next step；
S8：By lithium ion battery with 2A electric current constant-current discharge to 2.75V, the second discharge capacity C is recorded3And calculate electric discharge
Capacity difference Δ C3；
S9：Second discharge capacity extreme difference Δ C of the 2nd, 3,7~10 lithium-ion battery monomer3For 12mAh, in predetermined model
Enclose in 20mAh, fully enter in next step；
S10：After completing step S9, lithium ion battery is shelved into 30min, with the electricity of 1A electric current constant-current constant-voltage charging 28%
Amount, shelve after 10min with 2A electric current constant-current discharge to 2.75V, record the second discharge capacity C4And calculate discharge capacity difference Δ
C4；
S11：3rd discharge capacity extreme difference Δ C of the 2nd, 3,7~10 lithium-ion battery monomer4For 10mAh, first
In preset range 10mAh, fully enter in next step；
S12：After completing step S11, lithium ion battery is shelved into 30min, with 1A electric current constant-current constant-voltage charging 28%
Electricity；Normal temperature shelf measures its OCV after 1 day3, subsequent normal temperature shelf surveys the 4th open-circuit voltage OCV of lithium ion battery after 10 days4
With internal resistance IR, the second self-discharge value K is calculated2, the 4th open-circuit voltage extreme difference Δ OCV4With internal resistance extreme difference Δ IR；
S13：Second self-discharge value K of the 2nd, 3,7~10 lithium-ion battery monomer2, the 4th open-circuit voltage extreme difference Δ
OCV4With internal resistance extreme difference Δ IR within a predetermined range；
S14：2nd, the 3rd, the 7th, the 8th, the 9th, the 10th six monomer lithium ion batteries are combined into electricity
Pond module.
The test result of each lithium battery is as shown in table 1 in the present embodiment, and screening conditions are as shown in table 2.
Table 1：The Electrochemical results of each battery cell in embodiment 1
Table 2：The parameter setting range table of lithium ion battery in embodiment 1
The present invention is constantly reduced same by the way that under the conditions of different SOC, the screening of combo condition has been carried out to lithium ion battery
Discharge and recharge difference in one battery pack between multiple lithium batteries so that make the monomer lithium ion battery in same group after screening in big electricity
Banish electricity the end moment it is small with monomer lithium ion battery voltage pole extreme difference in group, electric discharge it is more abundant, depth of discharge is consistent, keeps away
Exempt from single branch battery to overcharge for a long time, cross situations such as putting, improve the uniformity of lithium-ion electric tank discharge.
The optional embodiment of example of the present invention, still, the embodiment of the present invention and unlimited are described in detail above in association with accompanying drawing
Detail in above-mentioned embodiment, can be to the embodiment of the present invention in the range of the technology design of the embodiment of the present invention
Technical scheme carry out a variety of simple variants, these simple variants belong to the protection domain of the embodiment of the present invention.
It is further to note that each particular technique feature described in above-mentioned embodiment, in not lance
In the case of shield, it can be combined by any suitable means.In order to avoid unnecessary repetition, the embodiment of the present invention pair
Various combinations of possible ways no longer separately illustrate.
In addition, it can also be combined between a variety of embodiments of the embodiment of the present invention, as long as it is not
The thought of the embodiment of the present invention is run counter to, it should equally be considered as disclosure of that of the embodiment of the present invention.
Claims (9)
1. a kind of lithium ion battery grouping method, it is characterised in that comprise the following steps：
First voltage threshold value is charged to each lithium ion battery in multiple lithium ion batteries, records each lithium-ion electric
The first charging capacity C in pond1, and calculate the first charging capacity extreme difference Δ C of multiple lithium ion batteries1；
The first charging capacity extreme difference Δ C is selected from the multiple lithium ion battery1Lithium-ion electric in the first preset range
Pond；
Each lithium ion battery in selected lithium ion battery is discharged to second voltage threshold value, recorded selected every
First discharge capacity C of one lithium ion battery2, and calculate the first discharge capacity extreme difference of selected multiple lithium ion batteries
ΔC2；
Second of the first discharge capacity extreme difference Δ C of selection from selected lithium ion battery2Lithium in the second preset range from
Sub- battery；
Each lithium ion battery in the lithium ion battery of second of selection is charged into the first electricity S1, shelve a period of time
First open-circuit voltage OCV of each lithium ion battery of second of selection of measurement afterwards1, then shelve very first time t1Afterwards in temperature
Spend the second open-circuit voltage OCV of each lithium ion battery of second of selection of measurement under T2, and calculate the every of second of selection
First self-discharge value K of one lithium ion battery1With the second open-circuit voltage extreme difference Δ OCV2；
K is selected for the third time from the lithium ion battery of second of selection1Value is in the 3rd preset range and the second open-circuit voltage extreme difference
ΔOCV2Lithium ion battery in the 4th preset range；
Each lithium ion battery in the lithium ion battery of third time selection is discharged to second voltage threshold value, record third time
Second discharge capacity C of each lithium ion battery of selection3, and calculate the of multiple lithium ion batteries of third time selection
Two discharge capacity extreme difference Δ C3；
The 4th the second discharge capacity extreme difference Δ C of selection from the lithium ion battery of third time selection3In the 5th preset range
Lithium ion battery；
Each lithium ion battery in the lithium ion battery of 4th selection is charged into the second electricity S2, then by the 4th time
Each lithium ion battery of selection is discharged to second voltage threshold value, records the of each lithium ion battery of the 4th selection
Three discharge capacity C4, and calculate the discharge capacity extreme difference Δ C of multiple lithium ion batteries the 3rd of the 4th selection4；
The 5th the 3rd discharge capacity extreme difference Δ C of selection from the lithium ion battery of the 4th selection4In the 6th preset range
Lithium ion battery；
Each lithium ion battery in the lithium ion battery of 5th selection is charged into the second electricity S2, shelve a period of time
The 3rd open-circuit voltage OCV of each lithium ion battery of the 5th selection is measured afterwards3, then shelve the second time t2After measure
4th open-circuit voltage OCV of each lithium ion battery of the 5th selection4With internal resistance IR, and calculate the 5th time selection it is each
Second self-discharge value K of individual lithium ion battery2, the 4th open-circuit voltage extreme difference Δ OCV4With internal resistance extreme difference Δ IR；
The 6th selection K from the lithium ion battery of the 5th selection2Value is in the 7th preset range and the 4th open-circuit voltage extreme difference
ΔOCV4In the 8th preset range and lithium ion batteries of the internal resistance extreme difference Δ IR in the 9th preset range；
The lithium ion battery of 6th selection is subjected to combo, to form battery pack.
2. lithium ion battery grouping method according to claim 1, it is characterised in that first preset range arrives for 0
The 3% of lithium battery rated capacity.
3. lithium ion battery grouping method according to claim 1, it is characterised in that second preset range arrives for 0
The 1% of lithium battery rated capacity；And/or
The first discharge capacity C2Scope be lithium battery rated capacity 100% to 108%.
4. lithium ion battery grouping method according to claim 1, it is characterised in that the K1Calculation formula be：K1=
(OCV1-OCV2)/t1；
3rd preset range is 0 to 1mV/h；
4th preset range is 0 to 3mV；
The first electricity S1Scope be SOC 70% to 100%；
The t1Scope be 2 to 5 days；
The scope of the T is 50 DEG C to 60 DEG C；And/or
The OCV2The scope of extreme difference is 0 to 3mV.
5. lithium ion battery grouping method according to claim 1, it is characterised in that the 5th preset range arrives for 0
The 1% of lithium battery rated capacity.
6. lithium ion battery grouping method according to claim 1, it is characterised in that the 6th preset range arrives for 0
The 0.5% of lithium battery rated capacity.
7. lithium ion battery grouping method according to claim 1, it is characterised in that the K2Calculation formula be：K2=
(OCV3-OCV4)/t2；
7th preset range is 0 to 0.05mV/h；
8th preset range is 0 to 3mV；
9th preset range is 0 to 1m Ω；
The second electricity S2Scope be SOC 25% to 30%；
The t2Scope be 10 to 15 days.
8. lithium ion battery grouping method as claimed in any of claims 1 to 7, it is characterised in that to battery
It is further comprising the steps of before carrying out combo：
The lithium ion battery of combo will be treated with the first discharge-rate CABlanking voltage is discharged to, again with second after standing a period
Discharge-rate CBIt is discharged to blanking voltage, wherein CA>CB。
9. lithium ion battery grouping method according to claim 8, it is characterised in that the first discharge-rate CAModel
It is 0.33C to 0.5C to enclose, and/or
The second discharge-rate CBScope be 0.05C to 0.2C.
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| CN112366370A (en) * | 2020-09-28 | 2021-02-12 | 中天储能科技有限公司 | Lithium ion battery matching method |
| CN112366370B (en) * | 2020-09-28 | 2022-08-12 | 中天储能科技有限公司 | Lithium ion battery matching method |
| CN112578302A (en) * | 2020-12-10 | 2021-03-30 | 中国电力科学研究院有限公司 | Echelon utilization power battery recombination method, system, equipment and storage medium |
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