CN107597619A - Lithium titanate cell uniformity method for separating - Google Patents

Lithium titanate cell uniformity method for separating Download PDF

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Publication number
CN107597619A
CN107597619A CN201710773164.1A CN201710773164A CN107597619A CN 107597619 A CN107597619 A CN 107597619A CN 201710773164 A CN201710773164 A CN 201710773164A CN 107597619 A CN107597619 A CN 107597619A
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battery
discharge
difference
lithium titanate
cell
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Inventor
陈永胜
张鹏
崔维国
王茂范
随东
李爱红
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Tianjin Plannano Technology Co Ltd
Tianjin Pulan Nano Technology Co Ltd
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Tianjin Plannano Technology Co Ltd
Tianjin Pulan Nano Technology Co Ltd
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Abstract

The present invention relates to a kind of lithium titanate cell uniformity method for separating, the static properties parameter such as capacity, voltage, internal resistance is taken into account, the dynamic parameters such as polarization impedance, high current charge-discharge and self discharge, once sorted by parameters such as discharge capacity, open-circuit voltage, AC internal Resistances, by carrying out secondary sorting after the quiescence in high temperature of certain time, sorted three times by big multiplying power pulsed discharge, the high lithium titanate cell of uniformity is finally obtained, solve thes problems, such as the bad sorting of cell uniformity in current lithium titanate battery system.By the lithium titanate battery sub-elected by this method in groups, the performance more excellent than common grouping method can be obtained, simultaneously, compared with existing conventional method for separating, method for separating proposed by the present invention is simple to operate, do not need unnecessary equipment investment and the testing time is very short, be easy to Industry Promotion application.

Description

Lithium titanate cell uniformity method for separating
Technical field
The invention belongs to battery detecting technical field, more particularly, to a kind of lithium titanate cell uniformity sorting side Method.
Background technology
Lithium ion battery fills in new energy passenger car, electric bus, track traffic, startup power supply, energy-storage system and weapon The application in the field such as standby is increasingly extensive, and people are to its high rate charge-discharge, low temperature discharge and recharge, cycle life and security etc. Requirement also more and more higher.Different from the small-sized electronic product such as mobile phone, power and energy-storage system generally require to enter cell The multiple series connection of row and parallel combination, to meet the demand such as its high-output power and big energy stores.If difference mistake between cell Greatly, the charged state between cell can be caused different in charge and discharge process, so as to cause the performance of whole battery system rapidly Decay.With the progress of charge and discharge cycles, the difference between cell is gradually increased, and then causes the securities such as blast on fire Hidden danger.Although the charging and discharging state with cell in balancing battery system, this quilt can be managed by additional circuit Dynamic measure is cured the symptoms, not the disease, and has the battery of steady charge and discharge platform especially for ferric phosphate lithium cell, lithium titanate battery etc. For system, its actual charging and discharging state can be more difficult to predict.Therefore, the uniformity between cell is still to influence whole electricity The key of cell system performance.
From the point of view of the production technology of lithium ion battery, needed since homogenate to resultant battery outbound by multiple working procedure, Even if applying the higher production equipment of control accuracy and being equipped with strict quality testing, the difference between cell is still Inevitably.Therefore, in addition to improving the manufacture level of cell, how the consistent cell of performance indications to be chosen Composition battery modules and system are elected, is also a very crucial link for the practical application of battery.Especially pin To with the lithium titanate battery system for stablizing charge and discharge platform, its platform discharge capacity and platform discharge time more than 90%, If routinely being tested merely by capacity, voltage, internal resistance etc., the difference between monomer battery is difficult to be detected. If the excessive lithium titanate cell of these othernesses is assembled into battery pack, battery cyclic penalty can be caused, is caused Overcharge or the safety risks such as mistake is put, the problem are also the key issue place in lithium titanate battery system application process.
At present, it is the master for carrying out combo sorting by detecting discharge capacity, open-circuit voltage and the AC internal Resistance of cell Will foundation, as the Chinese patent of Application No. 200510090831.3 discloses a kind of making side of energy storage lithium battery group Method.Although this method operates convenient and simple, it is substantially static measurement, not in view of the actual charge and discharge process of battery In dynamic load change, also do not consider polarization impedance, high current charge-discharge and self discharge etc. for cell uniformity Influence.The Chinese patent of Application No. 201610845902.4 and 201510084821.2 assesses electricity using charge and discharge voltage difference Pond uniformity, but for the very stable battery system of the charge and discharge platforms such as ferric phosphate lithium cell, lithium titanate battery, Jin Jintong Overpressure difference is difficult accurately to filter out the consistent battery of self discharge.The Chinese patent of Application No. 200810126839.4 uses constant current It is filled with capacity Q1 and constant pressure and is filled with capacity Q2 ratio R to carry out battery consistency judgement, but does not account for putting certainly for battery Electric difference.The Chinese patent of Application No. 201610016946.6 is electric to investigate different monomers using different dwell temperatures and time The self-discharge rate in pond, but do not account for the influence of polarization impedance and high current charge-discharge.Application No. 201010241411.1 Chinese patent to test DCR value of the battery at -50-0 DEG C as the method for judging battery consistency, the program has certain conjunction Rationality, but do not consider that the different and harsh low temperature environment of the DCR values of different battery systems is unfavorable for the industry of the program Change and promote.
As above the scheme of cell conformity classification, even there is unilateral part for conventional lithium-ion battery system, directly Connect when being used for lithium titanate battery system, due to the particularity of lithium titanate battery system charge and discharge platform, its drawback can be protruded more. Therefore, there is an urgent need to propose a cell uniformity method for separating for being directed to lithium titanate battery system, to meet lithium titanate Battery system is in energy storage and the practical application of dynamic field.
The content of the invention
Effectively to solve the problems, such as to run into current lithium titanate battery system cell uniformity assorting room, through excessive Experimental study is measured, the present invention proposes a kind of uniformity method for separating of lithium titanate cell.
The technical solution adopted by the present invention is:Lithium titanate cell uniformity method for separating, including assorting room three times, Specific assorting room is as follows:
Battery to be sorted by electric discharge capacity, open-circuit voltage, AC internal Resistance parameter for the first time divide by step 1 Choosing, acquisition once sort battery;
Step 2 will be sorted once after battery stands in high temperature environments, and internal resistance difference and open-circuit voltage difference are tested Carry out second to sort, obtain secondary sorting battery;
Step 3 carries out third time sorting to the big multiplying power pulsed discharge situation of secondary sorting battery detecting, is obtained after sorting The high lithium titanate cell of uniformity.
Wherein, the specific sorting step of step 1 is:
Battery to be sorted is carried out charge-discharge test by step A, is finally tuned into identical state-of-charge;
Step B counts discharge capacity of the cell, open-circuit voltage and AC internal Resistance to be sorted, and filters out discharge capacity difference and is 0-20%, the battery that AC internal Resistance difference is 0-30%, open-circuit voltage difference is 0-100mV are once to sort battery.
Preferably, discharge and recharge number is no less than 3 times in step A, and final SOC is 10-90%, preferably 30-70%.
Preferably, in step B screening criteria be discharge capacity difference be 0-2%, AC internal Resistance difference be 0-10%, open circuit Voltage differences are 0-20mV.
Wherein, the specific sorting step of step 2 is:
Step C, which will once sort battery and be placed in hot environment, to be stood, and is taken out from hot environment and is placed in normal temperature environment Middle standing;
The AC internal Resistance and open-circuit voltage of battery after step D detections are stood, internal resistance difference is filtered out as 0-30%, open circuit Voltage differences are that 0-100mV cells are secondary sorting battery;
Preferably, step C high temperatures environment is 35-60 DEG C, and the quiescence in high temperature time is 1-15 days, and normal temperature time of repose is 12h;
Preferably, hot environment is 45-55 DEG C, and the quiescence in high temperature time is 7-10 days.
Preferably, in step D screening criteria be internal resistance difference be 0-10%, open-circuit voltage difference be 0-20mV.
Wherein, step 3 is specially that with 1-30C current discharge 1-10s secondary sorting battery is stood into 40s, then with 1- 30C electric currents charging 1-10s, collection is charged and discharged front and rear Instantaneous Situation voltage, and calculates the voltage difference △ before and after electric discharge The V1 and front and rear voltage difference △ V2 that charge, the DC internal resistance DCR1 and DCR2 of battery in electric discharge and charging process are calculated respectively, it is logical Cross compare DCR1 and DCR2 differential screening go out DCR1 and DCR2 difference be 0-30% cell it is high as uniformity Lithium titanate cell;
Preferably, discharge current is 10-20C, discharge time 10s, charging current 10-20C in step 3, during charging Between be 10s.
Preferably, DCR1 and DCR2 difference is 0-10%.
The present invention has the advantages and positive effects of:
1 this programme has taken into account the static properties parameter such as capacity, voltage, internal resistance, polarization impedance, high current charge-discharge and from The dynamic parameters such as electric discharge, by sorting step by step three times, finally sub-elect the lithium titanate cell with high consistency, it is more because Element classification examination, can more accurately screen cell, the lithium titanate battery sub-elected by this programme in groups, can obtain ratio The more excellent performance of common grouping method;
2 compared with existing conventional method for separating, and method for separating proposed by the present invention is simple to operate, it is not necessary to unnecessary The equipment investment and testing time is very short, is easy to Industry Promotion application.
Brief description of the drawings
Fig. 1 is the flow chart of method for separating;
Fig. 2 is pulse discharge and recharge △ V1 and △ V2 choosing method schematic diagram;
Fig. 3 is that 5 lithium titanate cells that different sorting schemes sub-elect carry out the high temperature that 5S1P forms 12V battery packs 55 DEG C of 2C/2C cycle performances;
Fig. 4 is that the 12V battery packs for 5 lithium titanate cells progress 5S1P compositions that different sorting schemes sub-elect are being entered Discharge curve after the 2C/2C circulations 900 weeks of 55 DEG C of row.
Embodiment
Effectively to solve the problems, such as to run into current lithium titanate battery system cell uniformity assorting room, through excessive Experimental study is measured, the present invention proposes a kind of uniformity method for separating of lithium titanate cell.This method has taken into account capacity, electricity The dynamic parameters such as the static properties parameter such as pressure, internal resistance, polarization impedance, high current charge-discharge and self discharge, by dividing step by step three times Choosing, finally sub-elects the lithium titanate cell with high consistency.By by the lithium titanate battery that this method sub-elects into Group, the performance more excellent than common grouping method can be obtained.The present invention is explained below in conjunction with the accompanying drawings.
As shown in figure 1, the present invention relates to lithium titanate cell uniformity method for separating, it is characterised in that:Including three times Assorting room, specific assorting room are:
Battery to be sorted by electric discharge capacity, open-circuit voltage, AC internal Resistance parameter for the first time divide by step 1 Choosing, acquisition once sort battery;
Step 2 will be sorted once after battery stands in high temperature environments, and internal resistance difference and open-circuit voltage difference are tested Carry out second to sort, obtain secondary sorting battery;
Step 3 carries out third time sorting to the big multiplying power pulsed discharge situation of secondary sorting battery detecting, is obtained after sorting The high lithium titanate cell of uniformity.
Wherein, battery to be sorted is the cell produced under identical production technology, cell raw materials It is completely the same with technological parameter.
Specific sorting step is as follows:
Preparation process:Sub-elect the cell produced under identical production technology and be used as battery to be sorted, it is desirable to be same All used in battery raw material and technological parameter to be sorted are completely the same for one batch;
Step A:At least 3 charge-discharge tests, each charge or discharge operation are carried out to the battery to be sorted sorted out Between stand 10min, be finally tuned into identical state-of-charge, make SOC be 10-90%, preferably 30-70%, SOC 30-70% More preferably, uniformity is higher for screening effect;
Step B:Detect and count discharge capacity of the cell, open-circuit voltage and AC internal Resistance to be sorted, filter out discharge capacity The battery cell that difference is 0-20%, AC internal Resistance difference is 0-30%, open-circuit voltage difference is 0-100mV is once sorting electricity Pond, when needing the lithium titanate battery group of higher performance, control screening standard be discharge capacity difference be 0-2%, AC internal Resistance Difference is 0-10%, open-circuit voltage difference is 0-20mV;
Step C:The once sorting filtered out is electrically disposed and stands 1-15 days in the hot environment in 35-60 DEG C of pond and carries out height Temperature processing, high-temperature process takes out cell after terminating from hot environment, and stands 12 hours in normal temperature environment, fully Cooling;
Step D:The battery fully to cool after high-temperature process is detected, detects respectively and counts each cell AC internal Resistance and open-circuit voltage, the cell that screening internal resistance difference is 0-30%, open-circuit voltage difference is 0-100mV is as two Secondary sorting battery, likewise, when needing the lithium titanate battery group of higher performance, it is necessary to filter out internal resistance difference for 0-10%, Open-circuit voltage difference is 0-20mV cell as secondary sorting battery;
Step E:By secondary sorting battery with 1-30C current discharge 1-10s, 40s is stood, is then charged with 1-30C electric currents 1-10s, the Instantaneous Situation voltage before and after collection charging and discharging, before and after calculating the front and rear voltage difference △ V1 of electric discharge and charging Voltage difference △ V2 are simultaneously counted, as shown in Fig. 2 △ V1, which are electric discharge initial voltage, subtracts the difference that electric discharge latter stage voltage obtains, △ V2 is that latter stage of charging voltage subtracts the difference that charging initial voltage obtains;
Step F:Pass through battery in the Current calculation electric discharge for applying △ V1 and △ V2 respectively divided by accordingly and charging process DC internal resistance DCR1 and DCR2, filter out DCR1 and DCR2 difference be 0-30% cell as final sorting knot Fruit, when needing the lithium titanate battery group of higher performance, screening DCR1 and DCR2 difference is 0-10% cell conduct Final separation results, by the highly consistent cell finally sub-elected in groups, it becomes possible to obtain high-performance lithium titanate electricity Pond group.
Found by test of many times, in step E, it is 10-20C to make discharge current, and discharge 10s, charging current 10- 20C, charge 10s, and the DC internal resistance data for measuring and calculating gained are more accurate, and error rate is smaller, it is possible to increase sorting is accurate Rate.And by multiple large-scale batch testing, the selection of quiescence in high temperature temperature is 45-55 DEG C, and time of repose is 7-10 days, this The condition of sample can either meet the requirement of the accuracy rate of cell uniformity sorting, disclosure satisfy that industrial production high temperature ring again Border structure maintains cost, and industrial efficiency, is easy to Industry Promotion application.
With reference to conventional lithium titanate cell screening technique, the invention will be further elaborated with embodiment, but This is intended merely to the exploitativeness and superiority that more fully describe the present invention, and protection scope of the present invention is not limited to these Embodiment.
Comparative example 1
Ternary/lithium titanate cell that nominal capacity is 25Ah is taken, using 1C constant-current charges to 2.7V, 2.7V constant pressures are filled Electricity stands 10min, using 1C constant-current discharges to 1.5V, stands 10min to 0.05C.As above charge and discharge cycles are carried out 3 times, are obtained The actual discharge capacity of battery, finally using 1C constant-current charges 30min.Capacity difference is filtered out in the qualified battery of discharge capacity It is different within 0.5Ah, the cell that AC internal Resistance difference is within 0.02m Ω, open-circuit voltage difference is within 0.02V.Will 5 composition battery packs of the cell filtered out, finally carry out 2C/2C cycle performance tests by the battery pack at 55 DEG C again, Record the pressure difference and capability retention that flow between charging, constant-voltage charge and Model For Transverse-discharge Flow Type in cyclic process.
Comparative example 2
Ternary/lithium titanate cell that nominal capacity is 25Ah is taken, using 1C constant-current charges to 2.7V, 2.7V constant pressures are filled Electricity stands 10min, using 1C constant-current discharges to 1.5V, stands 10min to 0.05C.As above charge and discharge cycles are carried out 3 times, are obtained The actual discharge capacity of battery, finally using 1C constant-current charges 30min.Capacity difference is filtered out in the qualified battery of discharge capacity It is different within 0.5Ah, the cell that AC internal Resistance difference is within 0.02m Ω, open-circuit voltage difference is within 0.02V.Will The cell sub-elected stands 10 days in 45 DEG C of hot environments, then takes out and stands 12 hours in normal temperature environment, screening Go out the cell that AC internal Resistance difference is within 0.02m Ω, open-circuit voltage is within 0.02V.The cell 5 that will be filtered out Zhi Zucheng battery packs, the battery pack is finally subjected to 2C/2C cycle performance tests at 55 DEG C again, records the horizontal stroke in cyclic process Pressure difference and capability retention between current charge, constant-voltage charge and Model For Transverse-discharge Flow Type.
Embodiment 1
Ternary/lithium titanate cell that nominal capacity is 25Ah is taken, using 1C constant-current charges to 2.7V, 2.7V constant pressures are filled Electricity stands 10min, using 1C constant-current discharges to 1.5V, stands 10min to 0.05C.As above charge and discharge cycles are carried out 3 times, are obtained The actual discharge capacity of battery, finally using 1C constant-current charges 30min.Capacity difference is filtered out in the qualified battery of discharge capacity It is different within 0.5Ah, the cell that AC internal Resistance difference is within 0.02m Ω, open-circuit voltage difference is within 0.02V.Will The cell sub-elected stands 10 days in 45 DEG C of hot environments, then takes out and stands 12 hours in normal temperature environment, screening Go out the cell that AC internal Resistance difference is within 0.02m Ω, open-circuit voltage is within 0.02V.The battery filtered out is used 10C constant-current discharge 10s, 10C constant-current charge 10s are reused after standing 40s, record the dynamic electric voltage before and after 10C pulse discharge and recharges, Calculate voltage difference △ V1 (electric discharge) and △ V2 (charging), divided by 10C electric currents and then calculate in the direct current in charge and discharge process Hinder DCR1 (electric discharge) and DCR2 (charging).Filter out 5 compositions of cell of the difference within 0.2m Ω between DCR1 and DCR2 Battery pack, the battery pack is finally subjected to 2C/2C cycle performance tests at 55 DEG C again, the crossing current recorded in cyclic process fills Pressure difference and capability retention between electricity, constant-voltage charge and Model For Transverse-discharge Flow Type.
Embodiment 2
Ternary/lithium titanate cell that nominal capacity is 25Ah is taken, using 1C constant-current charges to 2.7V, 2.7V constant pressures are filled Electricity stands 10min, using 1C constant-current discharges to 1.5V, stands 10min to 0.05C.As above charge and discharge cycles are carried out 3 times, are obtained The actual discharge capacity of battery, finally using 1C constant-current charges 20min.Capacity difference is filtered out in the qualified battery of discharge capacity It is different within 0.5Ah, the cell that AC internal Resistance difference is within 0.02m Ω, open-circuit voltage difference is within 0.02V.Will The cell sub-elected stands 7 days in 55 DEG C of hot environments, then takes out and stands 12 hours in normal temperature environment, filters out AC internal Resistance difference is within 0.02m Ω, cell of the open-circuit voltage within 0.02V.The battery filtered out is used into 15C Constant-current discharge 10s, 15C constant-current charge 10s are reused after standing 40s, record the dynamic electric voltage before and after 10C pulse discharge and recharges, meter Calculate voltage difference △ V1 (electric discharge) and △ V2 (charging), divided by 15C electric currents and then calculate the DC internal resistance in charge and discharge process DCR1 (electric discharge) and DCR2 (charging).Filter out 5 composition electricity of cell of the difference within 0.2m Ω between DCR1 and DCR2 Pond group, the battery pack is finally subjected to 2C/2C cycle performance tests at 55 DEG C again, record crossing current charging in cyclic process, Pressure difference and capability retention between constant-voltage charge and Model For Transverse-discharge Flow Type.
Embodiment 3
Ternary/lithium titanate cell that nominal capacity is 25Ah is taken, using 1C constant-current charges to 2.7V, 2.7V constant pressures are filled Electricity stands 10min, using 1C constant-current discharges to 1.5V, stands 10min to 0.05C.As above charge and discharge cycles are carried out 3 times, are obtained The actual discharge capacity of battery, finally using 1C constant-current charges 20min.Capacity difference is filtered out in the qualified battery of discharge capacity It is different within 0.5Ah, the cell that AC internal Resistance difference is within 0.02m Ω, open-circuit voltage difference is within 0.02V.Will The cell sub-elected stands 10 days in 50 DEG C of hot environments, then takes out and stands 12 hours in normal temperature environment, screening Go out the cell that AC internal Resistance difference is within 0.02m Ω, open-circuit voltage is within 0.02V.The battery filtered out is used 20C constant-current discharge 10s, 20C constant-current charge 10s are reused after standing 40s, record the dynamic electric voltage before and after 20C pulse discharge and recharges, Calculate voltage difference △ V1 (electric discharge) and △ V2 (charging), divided by 20C electric currents and then calculate in the direct current in charge and discharge process Hinder DCR1 (electric discharge) and DCR2 (charging).Filter out 5 compositions of cell of the difference within 0.2m Ω between DCR1 and DCR2 Battery pack, the battery pack is finally subjected to 2C/2C cycle performance tests at 55 DEG C again, the crossing current recorded in cyclic process fills Pressure difference and capability retention between electricity, constant-voltage charge and Model For Transverse-discharge Flow Type.
The lithium titanate battery group performance that table 1 is obtained using different method for separating
* test condition is:Capability retention after 2C/2C is circulated 900 times at 55 DEG C
Sort battery performance test result such as Fig. 3, the Fig. 4 and table being assembled into respectively using comparative example and embodiment method Shown in 1.It can be seen that compared with the conventional single-cell uniformity method for separating used in comparative example 1 and comparative example 2, make With the battery pack that the cell that sub-elects of the present invention is assembled into after high temperature 2C/2C discharge and recharges 900 weeks capability retention have it is bright Aobvious raising, and the voltage platform after high temperature circulation is also higher than conventional method for separating more, absolutely proves using present invention sorting The cell uniformity gone out is higher than conventional method for separating.In summary, cell uniformity sorting side provided by the invention Method is sorted using three-level, has fully taken into account the static properties parameter such as capacity, voltage, internal resistance of battery, polarization impedance, high current The dynamic parameter such as discharge and recharge and self discharge, the lithium titanate cell with high consistency can be sub-elected.It is proposed by the present invention Method for separating is simple to operate, it is not necessary to which unnecessary equipment investment and testing time is very short, is especially advantageous for Industry Promotion application.
It is right it should be mentioned that although result above is the experiment carried out based on 25Ah ternarys/lithium titanate cylindrical battery Other nominal capacitys, other cell shapes (including square and soft-package battery) and (positive pole uses mangaic acid using other chemical systems Lithium, nickel ion doped, cobalt acid lithium, lithium nickelate, LiFePO4, lithium ferric manganese phosphate, lithium-rich manganese base material or the blending of a variety of positive electrodes) Lithium titanate battery, the uniformity method for separating of the cell is equally applicable.Meanwhile the method for separating could be applicable to non-titanium Acid lithium battery system, such as using graphite, hard carbon, soft carbon, carbonaceous mesophase spherules, silicon carbon material as negative pole ternary battery, mangaic acid Lithium battery, ferric phosphate lithium cell, cobalt acid lithium battery, lithium ferric manganese phosphate battery etc..Cell uniformity side of the present invention Method, the specific descriptions being not restricted in specification and embodiment, for those skilled in the art, It can easily realize some changes and improvement under the premise without departing from the principles of the invention, therefore without prejudice to claim and wait In the case of the General Principle that co-extensive is limited, these changes and improvement also should be regarded as protection scope of the present invention.

Claims (9)

1. lithium titanate cell uniformity method for separating, it is characterised in that:Including assorting room three times, specific assorting room is such as Under:
Battery to be sorted is carried out first time sorting by step 1 by electric discharge capacity, open-circuit voltage, AC internal Resistance parameter, is obtained Obtain and once sort battery;
Step 2 will be sorted once after battery stands in high temperature environments, and the is carried out to internal resistance difference and the test of open-circuit voltage difference Secondary sorting, obtain secondary sorting battery;
Step 3 carries out third time sorting to the big multiplying power pulsed discharge situation of secondary sorting battery detecting, and uniformity is obtained after sorting High lithium titanate cell.
2. lithium titanate cell uniformity method for separating according to claim 1, it is characterised in that:The step 1 tool Body sorting step is:
Battery to be sorted is carried out charge-discharge test by step A, is finally tuned into identical state-of-charge;
Step B counts discharge capacity of the cell, open-circuit voltage and AC internal Resistance to be sorted, and it is 0- to filter out discharge capacity difference 20%th, the battery that AC internal Resistance difference is 0-30%, open-circuit voltage difference is 0-100mV is once to sort battery.
3. lithium titanate cell uniformity method for separating according to claim 2, it is characterised in that:In the step A Discharge and recharge number is no less than 3 times, and final SOC is 10-90%, preferably 30-70%.
4. lithium titanate cell uniformity method for separating according to claim 2, it is characterised in that:In the step B Screening criteria be discharge capacity difference be 0-2%, AC internal Resistance difference is 0-10%, open-circuit voltage difference is 0-20mV.
5. lithium titanate cell uniformity method for separating according to claim 1, it is characterised in that:The step 2 tool Body sorting step is:
Step C, which will once sort battery and be placed in hot environment, to be stood, taken out from hot environment be placed in it is quiet in normal temperature environment Put;
The AC internal Resistance and open-circuit voltage of battery after step D detections are stood, filter out internal resistance difference as 0-30%, difference in open circuit voltage Different is that 0-100mV cells are secondary sorting battery.
6. lithium titanate cell uniformity method for separating according to claim 5, it is characterised in that:In the step C Hot environment is 35-60 DEG C, and the quiescence in high temperature time is 1-15 days, and normal temperature time of repose is 12h;Preferably, hot environment 45- 55 DEG C, the quiescence in high temperature time is 7-10 days.
7. lithium titanate cell uniformity method for separating according to claim 5, it is characterised in that:In the step D Screening criteria be internal resistance difference be 0-10%, open-circuit voltage difference be 0-20mV.
8. lithium titanate cell uniformity method for separating according to claim 1, it is characterised in that:The step 3 tool Body is that with 1-30C current discharge 1-10s secondary sorting battery is stood into 40s, then with 1-30C electric currents charging 1-10s, collection Front and rear Instantaneous Situation voltage is charged and discharged, and calculates the front and rear voltage difference △ V1 of the electric discharge voltage difference △s front and rear with charging V2, the DC internal resistance DCR1 and DCR2 of battery in electric discharge and charging process is calculated respectively, by the difference for comparing DCR1 and DCR2 The difference for filtering out DCR1 and DCR2 is the 0-30% cell lithium titanate cell high as uniformity;
Preferably, discharge current is 10-20C in the step 3, and discharge time 10s, the charging current is 10-20C, is filled The electric time is 10s.
9. lithium titanate cell uniformity method for separating according to claim 8, it is characterised in that:DCR1's and DCR2 Difference is 0-10%.
CN201710773164.1A 2017-08-31 2017-08-31 Lithium titanate cell uniformity method for separating Withdrawn CN107597619A (en)

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CN108246658A (en) * 2017-12-12 2018-07-06 合肥国轩高科动力能源有限公司 A kind of method of ferric phosphate lithium cell conformity classification
CN108461858A (en) * 2018-03-23 2018-08-28 上海应用技术大学 A kind of screening technique that lithium titanate battery echelon utilizes
CN108993931A (en) * 2018-05-18 2018-12-14 中山大学 A kind of method for separating of power battery
CN109365325A (en) * 2018-09-17 2019-02-22 深圳市华格安瑞技术咨询有限公司 A kind of manufacturing method and system of battery
CN109541474A (en) * 2018-11-27 2019-03-29 清华-伯克利深圳学院筹备办公室 A kind of method for separating and device of lithium-ion battery monomer battery core
CN109613440A (en) * 2019-01-17 2019-04-12 清华-伯克利深圳学院筹备办公室 Stage division, device, equipment and the storage medium of battery
CN109731808A (en) * 2018-11-30 2019-05-10 天合光能股份有限公司 The detection method for separating that a kind of pair of lithium battery echelon utilizes
CN109821775A (en) * 2019-01-09 2019-05-31 中兴高能技术有限责任公司 A kind of method, terminal and storage medium screening battery
CN110201913A (en) * 2019-05-29 2019-09-06 河南电池研究院有限公司 A kind of screening technique of soft bag lithium ionic cell consistency
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