CN113178632A - Method for recovering monomer consistency of lithium ion storage battery pack - Google Patents

Method for recovering monomer consistency of lithium ion storage battery pack Download PDF

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CN113178632A
CN113178632A CN202110452743.2A CN202110452743A CN113178632A CN 113178632 A CN113178632 A CN 113178632A CN 202110452743 A CN202110452743 A CN 202110452743A CN 113178632 A CN113178632 A CN 113178632A
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storage battery
battery pack
monomer
voltage
charge
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CN113178632B (en
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王虎平
李娟娟
杨淼
冷书林
蔡晟
喻昭祥
于希
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Shanghai Institute of Space Power Sources
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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
    • 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
    • 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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  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses a method for recovering the monomer consistency of a lithium ion storage battery pack, wherein the storage battery pack comprises a plurality of storage battery monomers, and the storage battery monomers are connected in series or in series-parallel. The method can effectively reduce the performance dispersion of the storage battery monomers in the storage battery pack and improve the consistency of the whole storage battery pack, thereby achieving the purposes of improving the performance of the storage battery pack, prolonging the service life of the storage battery pack and simultaneously reducing and avoiding safety accidents.

Description

Method for recovering monomer consistency of lithium ion storage battery pack
Technical Field
The invention relates to a lithium ion storage battery pack technology, in particular to a method for recovering monomer consistency of a lithium ion storage battery pack.
Background
The lithium ion battery pack is composed of a plurality of storage battery monomers in different series-parallel connection modes, in the long-term charge-discharge cycle process, due to the fact that the charging efficiency, the charge holding capacity, the capacity attenuation rate and the like of the single batteries in the battery pack are different, the difference of the charge quantity of the single batteries in the battery pack is larger and is in a divergence trend, the discreteness of the performance among the single batteries of the battery pack is increased, the performance attenuation of individual storage batteries is intensified, the problems of capacity reduction, service life shortening and the like of the whole battery pack are caused, in serious cases, some storage battery monomers can be overcharged, some storage battery monomers are insufficiently charged, some monomers are overdischarged, and accordingly, the storage battery monomers are subjected to internal short circuit, fire hazards and other safety accidents are caused, and personal and property safety is endangered. Therefore, when the voltage dispersion of the storage battery monomer in the lithium ion storage battery pack is large, the storage battery monomer in the storage battery pack needs to be maintained to recover the consistency of the monomers in the storage battery pack, so that the performance of the storage battery pack is improved, and safety accidents are reduced and avoided.
Currently, the common method is to perform equalization processing on the lithium ion battery pack cells to reduce the dispersion among the battery cells, so as to restore the consistency of the battery pack cells. However, consistency recovery of some lithium ion storage battery packs cannot be achieved through equalization processing, and on the contrary, dispersion among storage battery monomers is aggravated through the equalization processing method, so that performance of the storage battery packs is more attenuated or safety accidents are caused.
Disclosure of Invention
The invention provides a method for recovering the monomer consistency of a lithium ion storage battery pack to solve the technical problems in the prior art.
In order to achieve the purpose, the invention is realized by the following technical scheme: a lithium ion storage battery pack monomer consistency recovery method comprises a plurality of storage battery monomers, wherein the storage battery monomers are connected in series or in series-parallel, and the parallel-connected monomers are regarded as one storage battery monomer; the method comprises the following steps:
step 1, adjusting the charge state of a lithium ion storage battery pack to 50% -90%;
step 2, collecting the open-circuit voltage of each storage battery monomer in the lithium ion storage battery pack, and recording the open-circuit voltage V1, V2, … Vn of each single battery, wherein n is the number of the storage battery monomer in series connection;
step 3, charging the storage battery pack for 3-5 min at the current of 0.1-0.3C, and collecting the charging voltage V of each storage battery monomerchargeNote down the voltage at the end of charging of each cell, V1charge，V2charge，…VnchargeCalculating the difference between the charging voltage and the open circuit voltage of each cell, delta V1charge，ΔV2charge，…ΔVnchargeWherein Δ Vncharge＝VnchargeVn, followed by calculation of the average value of all monomers Δ V
Figure BDA0003037582390000021
Figure BDA0003037582390000022
Step 4, opening the circuit for 5-10 minutes, discharging the storage battery pack for 3-5 min at the current of 0.1-0.3C, collecting the discharge voltage of each storage battery monomer in the lithium ion storage battery pack, and recording the voltage V1 when the discharge of each storage battery monomer is terminateddis，V2dis，…Vndis(n is the number of the storage battery monomers in series connection), calculating the difference between the open-circuit voltage and the discharge voltage of each monomer, namely delta V1dis，ΔV2dis，…ΔVndisWherein Δ Vndis＝Vn-VndisThen all monomers are calculated
Figure BDA0003037582390000023
The average value of the values is calculated,
Figure BDA0003037582390000024
Figure BDA0003037582390000025
step 5, if the storage battery pack has a monomer, the storage battery pack
Figure BDA0003037582390000026
And
Figure BDA0003037582390000027
if the values are more than the set value alpha mV, starting monomer consistency recovery according to the steps 6 to 11;
step 6, discharging the storage battery pack at a current of 0.1-0.3C until the electric quantity of the storage battery pack is less than the lowest allowable voltage of any storage battery monomer, and then discharging the storage battery pack at a current of 0.02-0.05C until the electric quantity of the storage battery pack is less than the lowest allowable voltage of any storage battery monomer;
step 7, the storage battery pack is placed for 1-3 days in an open circuit mode;
step 8, carrying out constant current charging on the storage battery pack at a current of 0.1-0.3C, then converting into constant voltage charging, and charging the storage battery pack to a full charge state;
9, discharging the storage battery pack at a current of 0.1-0.3C until the electric quantity of the storage battery pack is less than the lowest allowable voltage of any storage battery monomer, and then discharging the storage battery pack at a current of 0.02-0.05C until the electric quantity of the storage battery pack is less than the lowest allowable voltage of any storage battery monomer;
step 10, the storage battery pack is placed for 1-3 days in an open circuit mode;
step 11, repeating the steps 1 to 5 until all the cells of the battery pack are obtained, wherein
Figure BDA0003037582390000031
And
Figure BDA0003037582390000032
meanwhile, the values are all smaller than a set value alpha mV;
and 12, finding out the monomer with the highest charging voltage and the monomer with the lowest charging voltage of the storage battery pack in the step 3, calculating the difference between the monomers, and if the difference is greater than a set value beta mV, carrying out equalization treatment on the whole storage battery until the difference is less than the set value gamma mV.
Preferably, the alpha value is 30 mV-80 mV.
Preferably, the beta is 60 mV-100 mV.
Preferably, gamma is 10mV to 30 mV.
Compared with the prior art, the invention has the following beneficial effects:
the method can effectively reduce the performance dispersion of the storage battery monomers in the storage battery pack and improve the consistency of the whole storage battery pack, thereby achieving the purposes of improving the performance of the storage battery pack, prolonging the service life of the storage battery pack and simultaneously reducing and avoiding safety accidents.
Drawings
Fig. 1 is a flow chart of a method for recovering consistency of lithium ion battery cells according to the present invention.
Detailed Description
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
In this example, a lithium ion battery pack comprising 2 parallel 7 strings of 14 lithium cobaltate monomers with a capacity of 50Ah was used as an example. In the storage battery pack with 2 parallel and 7 series, every two monomers are connected in parallel, then the monomers connected in parallel are connected in series, and the 2 parallel single batteries are regarded as one monomer, so that the series number of the storage battery pack monomers is 7.
Step one, adjusting the charge state of the lithium ion storage battery pack to about 80%.
Step two, collecting open-circuit voltages of 7 single batteries in the lithium ion battery pack, wherein the open-circuit voltages of the 7 single batteries are respectively V1-3.954V, V2-3.948V, V3-3.935V, V4-3.955V, V5-3.944V, V6-3.954V, and V7-3.955V.
Step three, charging the storage battery pack for 3min by using 0.2C current, and collecting the charging voltage V of 7 storage battery monomers in the lithium ion storage battery packchargeRecording the voltage of each single battery of the storage battery pack 7 at the time of charge termination as V1charge＝4.009V，V2charge＝3.994V，V3charge＝4.174V，V4charge＝4.006V，V5charge＝3.989V，V6charge＝4.000V，V7chargeThe difference between the charging voltage and the open circuit voltage (Δ Vn) was calculated for 7 cells at 4.001Vcharge＝Vncharge-Vn) of each：ΔV1charge＝55mV，ΔV2charge＝46mV，ΔV3charge＝239mV，ΔV4charge＝51mV，ΔV5charge＝45mV，ΔV6charge＝46mV，ΔV7charge46 mV. Then 7 monomers were calculated
Figure BDA0003037582390000041
The average value of the values is calculated,
Figure BDA0003037582390000042
Figure BDA0003037582390000043
step four, opening the circuit for 5-10 minutes, discharging the storage battery pack for 3min at the current of 0.2C, collecting the discharge voltage of each storage battery monomer in the lithium ion storage battery pack, and recording the voltage V1 when the discharge of 7 single batteries in the storage battery pack is terminateddis＝3.903V，V2dis＝3.906V，V3dis＝3.743V，V4dis＝3.907V，V5dis＝3.901V，V6dis＝3.912V，V7disWhen 3.901V, the difference between the open circuit voltage and the discharge voltage of 7 cells, Δ Vn, is calculateddis＝Vn-VndisRespectively is as follows: Δ V1dis＝51mV，ΔV2dis＝42mV,ΔV3dis＝192mV,ΔV4dis＝48mV,ΔV5dis＝43mV,ΔV6dis＝42mV,ΔV7dis54mV, 7 monomers are then calculated
Figure BDA0003037582390000051
The average value of the values is calculated,
Figure BDA0003037582390000052
step five, judging whether the storage battery pack has a monomer or not, wherein the monomer is
Figure BDA0003037582390000053
And
Figure BDA0003037582390000054
Figure BDA0003037582390000055
and simultaneously, the values are both larger than alpha mV, and the value of alpha in the embodiment is 50. Calculated of monomer 3
Figure BDA0003037582390000056
Figure BDA0003037582390000057
And is
Figure BDA0003037582390000058
While more than 50mV of other monomers
Figure BDA0003037582390000059
Figure BDA00030375823900000510
And
Figure BDA00030375823900000511
if the values are negative values and are less than 50mV, the steps from six to eleven are carried out.
And sixthly, discharging the storage battery pack by using the current of 0.2C until the voltage of any monomer in the storage battery pack is less than 2.75V, and then continuously discharging the storage battery pack by using the current of 0.05C until the voltage of any monomer in the storage battery pack is less than 2.75V.
And seventhly, the storage battery pack is placed for 1 day in an open circuit mode.
Step eight, carrying out constant current charging on the storage battery pack by using the current of 0.2C until the voltage of the storage battery pack is 28.7V or the voltage of any monomer in the storage battery pack is more than 4.2V, and then converting to constant voltage charging until the charging current is less than 0.05C.
Discharging the storage battery pack with the current of 0.2C until the voltage of any monomer in the storage battery pack is less than 2.75V, and then continuously discharging the storage battery pack with the current of 0.05C until the voltage of any monomer in the storage battery pack is less than 2.75V.
Step ten, the storage battery pack is placed for 3 days in an open circuit mode.
Step eleven, adjusting the charge state of the lithium ion battery pack to about 60%.
And step twelve, collecting open-circuit voltages of 7 storage battery cells in the lithium ion storage battery pack, wherein the open-circuit voltages of the 7 storage battery cells are respectively V1-3.915V, V2-3.906V, V3-3.898V, V4-3.911V, V5-3.899V, V6-3.910V, and V7-3.911V.
Thirteen step, charging the storage battery pack for 3min by 0.2C current, and collecting the charging voltage V of 7 storage battery monomers in the lithium ion storage battery packchargeRecording the voltage of each single battery of the storage battery pack 7 at the time of charge termination as V1charge＝3.965V，V2charge＝3.951V，V3charge＝3.970V，V4charge＝3.958V，V5charge＝3.945V，V6charge＝3.957V，V7chargeThe difference between the charging voltage and the open circuit voltage (Δ Vn) was calculated for 7 cells at 3.959Vcharge＝Vncharge-Vn) being respectively: Δ V1charge＝50mV，ΔV2charge＝45mV,ΔV3charge＝72mV,ΔV4charge＝47mVΔV5charge＝46mV,ΔV6charge＝47mV,ΔV7chargeCalculation of 7 monomers after 48mV
Figure BDA0003037582390000061
The average value of the values is calculated,
Figure BDA0003037582390000062
Figure BDA0003037582390000063
step fourteen, opening the circuit for 5-10 minutes, then discharging the storage battery pack for 3min at the current of 0.2C, collecting the discharge voltage of each storage battery monomer in the lithium ion storage battery pack, and recording the voltage V1 when the discharge of 7 single batteries in the storage battery pack is terminateddis＝3.875V，V2dis＝3.871V，V3dis＝3.836V，V4dis＝3.874V，V5dis＝3.863V，V6dis＝3.873V，V7disWhen the voltage difference between the open circuit voltage and the discharge voltage is calculated as Δ Vn, 7 cells are set to 3.873Vdis＝Vn-VndisRespectively is as follows: Δ V1dis＝40mV，ΔV2dis＝35mV,ΔV3dis＝62mV,ΔV4dis＝37mV,ΔV5dis＝36mV,ΔV6dis＝37mV,ΔV7dis38mV, followed by 7 monomers Δ VdisThe average value of the values is calculated,
Figure BDA0003037582390000064
fifteen, judging whether the storage battery pack has a monomer or not, wherein the monomer is
Figure BDA0003037582390000065
And
Figure BDA0003037582390000066
Figure BDA0003037582390000067
and both are greater than 50 mV. The calculation shows that the difference value of the monomer 3 is the largest,
Figure BDA0003037582390000068
and is
Figure BDA0003037582390000069
While less than 50mV of other monomers
Figure BDA00030375823900000610
And
Figure BDA00030375823900000611
Figure BDA00030375823900000612
are negative and are less than 50 mV.
In the sixteenth step and the thirteenth step, the monomer with the highest charging voltage is V3charge3.970V, the lowest charging voltage is V5chargeThe difference between the two is 25mV and less than 60mV, which is 3.945V, and the equalization treatment is not needed.
Seventhly, finishing.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.

Claims (4)

1. The method for recovering the consistency of the single batteries of the lithium ion storage battery pack is characterized in that the storage battery pack comprises a plurality of storage battery single batteries which are connected in series or in series-parallel, wherein the parallel single batteries are regarded as one storage battery single battery; the method comprises the following steps:
step 1, adjusting the charge state of a lithium ion storage battery pack to 50% -90%;
step 2, collecting the open-circuit voltage of each storage battery monomer in the lithium ion storage battery pack, and recording the open-circuit voltage V1, V2, … Vn of each single battery, wherein n is the number of the storage battery monomer in series connection;
step 3, charging the storage battery pack for 3-5 min at the current of 0.1-0.3C, and collecting the charging voltage V of each storage battery monomerchargeNote down the voltage at the end of charging of each cell, V1charge，V2charge，…VnchargeCalculating the difference between the charging voltage and the open circuit voltage of each cell, delta V1charge，ΔV2charge，…ΔVnchargeWherein Δ Vncharge＝VnchargeVn, followed by calculation of the average value of all monomers Δ V
Figure FDA0003037582380000011
Figure FDA0003037582380000012
Step 4, opening the circuit for 5-10 minutes, discharging the storage battery pack for 3-5 min at the current of 0.1-0.3C, collecting the discharge voltage of each storage battery monomer in the lithium ion storage battery pack, and recording the voltage V1 when the discharge of each storage battery monomer is terminateddis，V2dis，…Vndis(n is the number of the storage battery unit in series connection), and calculating the open-circuit voltage of each unitDifference from discharge voltage, Δ V1dis，ΔV2dis，…ΔVndisWherein Δ Vndis＝Vn-VndisThen all monomers are calculated
Figure FDA0003037582380000013
The average value of the values is calculated,
Figure FDA0003037582380000014
Figure FDA0003037582380000015
step 5, if the storage battery pack has a monomer, the storage battery pack
Figure FDA0003037582380000016
And
Figure FDA0003037582380000017
if the values are more than the set value alpha mV, starting monomer consistency recovery according to the steps 6 to 11;
step 6, discharging the storage battery pack at a current of 0.1-0.3C until the electric quantity of the storage battery pack is less than the lowest allowable voltage of any single body of the storage battery, then discharging the storage battery pack at a current of 0.02-0.05C until the electric quantity of the storage battery pack is less than the lowest allowable voltage of any single body of the storage battery;
step 7, the storage battery pack is placed for 1-3 days in an open circuit mode;
step 8, carrying out constant current charging on the storage battery pack at a current of 0.1-0.3C, then converting into constant voltage charging, and charging the storage battery pack to a full charge state;
9, discharging the storage battery pack at a current of 0.1-0.3C until the electric quantity of the storage battery pack is less than the lowest allowable voltage of any storage battery monomer, and then discharging the storage battery pack at a current of 0.02-0.05C until the electric quantity of the storage battery pack is less than the lowest allowable voltage of any storage battery monomer;
step 10, the storage battery pack is placed for 1-3 days in an open circuit mode;
step 11, repeat stepStep 1 to step 5, up to all the cells of the battery, which
Figure FDA0003037582380000021
Figure FDA0003037582380000022
And
Figure FDA0003037582380000023
meanwhile, the values are all smaller than a set value alpha mV;
and 12, finding out the monomer with the highest charging voltage and the monomer with the lowest charging voltage of the storage battery pack in the step 3, calculating the difference between the monomers, and if the difference is greater than a set value beta mV, carrying out equalization treatment on the whole storage battery until the difference is less than the set value gamma mV.
2. The method for recovering the monomer consistency of the lithium ion battery pack according to claim 1, wherein the α value is 30mV to 80 mV.
3. The method for recovering the monomer consistency of the lithium ion battery pack according to claim 1, wherein the beta is 60mV to 100 mV.
4. The method for recovering the monomer consistency of the lithium ion battery pack according to claim 1, wherein γ is 10mV to 30 mV.
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