CN102728564A - Screening method of lithium cobaltate monomer batteries - Google Patents
Screening method of lithium cobaltate monomer batteries Download PDFInfo
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Abstract
The invention relates to a screening method of lithium cobaltate monomer batteries. The method comprises the steps that: samples are discharged with a constant-current discharge manner, until the samples are in completely discharged states; the obtained samples are subjected to constant-current charging; when the voltages of the samples are 3.5-3.7V, charging is stopped; the samples are stood with an open-circuit manner for 7-10 days under normal temperature, wherein the normal temperature is 15-35 DEG C; voltage detection is carried out upon the samples, and unqualified samples are sorted out. With the method provided by the invention, detection efficiency can be improved, the operation is simple, the safety is high, the cost is low, and the production efficiency is high. Also, safety risks and reversible capacity loss when the lithium monomer batteries are placed and operated under high voltage are avoided. The invention is especially suitable for the screening of lithium cobaltate monomer batteries.
Description
Technical field
The present invention relates to a kind of screening technique of cobalt acid lithium cell.
Background technology
Current, big capacity, high power lithium ion cell generally are formed by connecting through serial or parallel connection a plurality of cells, and the uniformity of aspect of performances such as cell capacity, internal resistance, self-discharge rate is the key that guarantees that its performance is good and bad.Lithium ion battery ubiquity self-discharge phenomenon; The big cell of self discharge heating can occur, phenomenons such as flatulence even blast in the cycle charge discharge electric process; There is bigger potential safety hazard; Especially when the big cell of self discharge and other cells in groups after, not only can influence the electrical property of battery pack, even can further worsen the security performance of battery pack.Therefore, must carry out strict screening at battery to the self discharge of cell before in groups.
Retention of charge to cell in QB/T 2502-2000 " lithium-ions battery general specification " explicitly calls for; Regulation is full of the cell of electricity after open circuit is shelved 30; Its discharge capacity should be not less than 90% of actual capacity, and promptly the cell self-discharge rate should not be higher than 10%.In the middle of actual production and the manufacturing, utilize the open-circuit voltage rate of descent of interior cell of unit interval in storage period to come the self discharge of cell is screened usually.The self discharge of lithium ion battery mainly is that the leakage current that exists micro-short circuit to cause by the active boundary response of electrolyte and negative pole graphite type material or inside battery is caused; Take place with lower speed (self-discharge rate every month 3% approximately) as the one of which; And the open-circuit voltage difference of cobalt acid lithium battery between higher charging state (more than the 20%SOC) is also not obvious; Therefore; Traditional use charges to half charging state, and ((4.1～4.2V) shelve and carry out the self discharge method for screening, and its voltage decline effect is also not obvious, can not well detect the big cell of self discharge for 3.8V～4.0V) or full charging state.In addition, more obvious for voltage is descended, improve detection efficiency; The general requirement of the traditional detection method time of shelving perhaps was shelved under the higher temperature (35 ℃～50 ℃) on 14～28 carries out; Voltage to quicken battery descends, thereby conveniently filters out the big cell of self discharge, therefore exists the production cycle long; The problem that energy waste is more; And the poor stability of shelving and operating under the battery high pressure, complex procedures, thus the self discharge that is unfavorable for lithium ion single battery in the large-scale production is screened.
Problem about lithium ion battery self discharge screening; Publication number is that the Chinese patent of CN1925204A has proposed battery charge and can solve when usually charging to 3.92V the voltage unconspicuous problem that descends to 4.0V～4.2V; Make the self discharge verification and measurement ratio bring up to 2.6% by 1.8%; But increased electric core causes electric core flatulence, blast because of the size increase when full electricity storage risk, in addition its self discharge verification and measurement ratio improves and is not obvious, is difficult to reach the purpose of effective screening.On this basis; Publication number is that the Chinese patent of CN101431166A has proposed storage to be divided into twice to carry out through utilizing half electric storage and the advantage that full electricity stores, and promptly carries out half electricity earlier after storage a period of time; Filter out the underproof electric core of voltage; Carry out full electricity storage again, filter out the underproof electric core of voltage, though the potential safety hazard when this invention has reduced electric core storage to a certain extent; But it still belongs to the high pressure storage in essence, and the potential safety hazard in operating process and storage process still exists; Its operation increases still more, complicated operation, and cost is higher, is unfavorable for the self discharge screening of lithium ion single battery.What be worth explanation is, there are not problems such as burin-in process in lithium ion finished product cell, and has generally passed through Preliminary screening, and its self discharge difference is less relatively, adopts traditional screening technique, and its voltage decline is more not obvious.
Summary of the invention
Technical problem to be solved by this invention exists potential safety hazard and complicated operation, cost problem of higher to prior art exactly, proposes a kind of self discharge screening technique of safe and simple effective cobalt acid lithium cell.
The present invention solve the technical problem, and the technical scheme of employing is: a kind of screening technique of cobalt acid lithium cell, it is characterized in that, and may further comprise the steps:
A. discharge: the mode of samples using constant-current discharge is discharged to the attitude of discharging fully;
B. charging: the sample to obtaining among the step a carries out constant-current charge, charges to stop charging when sample voltage is 3.5～3.7V;
C. open circuit is placed: the sample that obtains among the step b is opened a way at normal temperatures placed 7～10 days, said normal temperature is 15～35 ℃;
D. screening: the sample to obtaining among the step c carries out voltage detecting, and underproof sample is selected.
Concrete, the discharge-rate of constant-current discharge described in the step a is 0.1～0.2C.
This programme has proposed a kind of current range of preferential constant-current discharge; Because the general charged storage of lithium ion single battery; Therefore; Need before the charging state-of-charge of cell is adjusted into the attitude of discharging fully as much as possible, and can make cell be adjusted into the attitude of discharging fully as much as possible with the discharge-rate constant-current discharge in this scope.
More specifically, the rate of charge of constant-current charge described in the step b is 0.05～0.3C.
This programme has proposed a kind of current range of preferential constant-current charge; Charge with the rate of charge in this scope; Both can guarantee the identical low charging state that is in that all cells try one's best, it is more obvious that monomer battery voltage is descended, thereby help conveniently filtering out the big cell of self discharge; Can guarantee that again normal cell has certain carrying capacity, can't cause the cell overdischarge because of shelving.
Beneficial effect of the present invention does; Can effectively improve detection efficiency; Have simple to operate, safe, with low cost, advantage of high production efficiency, the potential safety hazard when having avoided the lithium ion single battery under high pressure to shelve and operate simultaneously and the loss of reversible capacity.
Description of drawings
Fig. 1 is cobalt acid lithium battery typical case state-of-charge (SOC)-open-circuit voltage (V) curve map.
The specific embodiment
Below in conjunction with accompanying drawing, embodiment and Comparative Examples, describe technical scheme of the present invention in detail.
As shown in Figure 1; The open-circuit voltage difference of cobalt acid lithium battery between higher charging state (more than the 20%SOC) is also not obvious; Therefore ((4.1～4.2V) shelve and carry out the self discharge method for screening for 3.8V～4.0V) or full charging state it to be charged to half charging state by Traditional use; Its voltage decline effect is also not obvious, can not well detect the big cell of self discharge, therefore the present invention proposes a kind of new effective screening technique to cobalt acid lithium cell.
The screening technique of a kind of cobalt acid lithium cell of the present invention mainly may further comprise the steps:
A. discharge: the mode of samples using constant-current discharge is discharged to the attitude of discharging fully;
B. charging: the sample to obtaining among the step a carries out constant-current charge, charges to stop charging when sample voltage is 3.5～3.7V;
C. open circuit is placed: the sample that obtains among the step b is opened a way at normal temperatures placed 7～10 days, said normal temperature is 15～35 ℃;
D. screening: the sample to obtaining among the step c carries out voltage detecting, and underproof sample is selected.
Because the general charged storage of lithium ion single battery; Therefore; Need before the charging state-of-charge of cell is adjusted into the attitude of discharging fully as much as possible; A kind of discharge-rate of preferred constant-current discharge is 0.1～0.2C, can make cell be adjusted into the attitude of discharging fully as much as possible with the discharge-rate constant-current discharge in this scope.
A kind of rate of charge of preferred constant-current charge is 0.05～0.3C; Charge with the rate of charge in this scope; Both can guarantee the identical low charging state that is in that all cells try one's best, it is more obvious that monomer battery voltage is descended, thereby help conveniently filtering out the big cell of self discharge; Can guarantee that again normal cell has certain carrying capacity, can't cause the cell overdischarge because of shelving.
Embodiment 1:
Select arbitrarily with 100 of a collection of 7045135 Soft Roll polymer cobalts acid lithium cells, with cell with the discharge-rate constant-current discharge of 0.1C to discharge cut-off voltage 3.0V, again with cell with the rate of charge constant-current charge of 0.05C to 3.5V; After shelving 2 hours; Detect the open-circuit voltage first of each cell; Again cell is shelved processing; Detect the open-circuit voltage of each cell every day, and calculate the cell voltage drop of every day, computational methods be the cell open-circuit voltage that detects every day deduct its first open-circuit voltage be the cell voltage drop of every day.After shelving 10, filter out the voltage cell faster that descends, be the big cell of self discharge, drawing the defective verification and measurement ratio of self discharge is 10%.
Embodiment 2:
Select arbitrarily with 100 of a collection of 7045135 Soft Roll polymer cobalts acid lithium cells, with cell with the discharge-rate constant-current discharge of 0.2C to discharge cut-off voltage 3.0V, again with cell with the rate of charge constant-current charge of 0.1C to 3.6V; Press the open-circuit voltage that embodiment 1 identical method detects each cell, and the voltage drop of calculating each cell.After shelving 8, filter out the voltage cell faster that descends, be the big cell of self discharge, drawing the defective verification and measurement ratio of self discharge is 7%.
Embodiment 3:
Select arbitrarily with 100 of a collection of 7045135 Soft Roll polymer cobalts acid lithium cells, with cell with the discharge-rate constant-current discharge of 0.2C to discharge cut-off voltage 3.0V, again with cell with the rate of charge constant-current charge of 0.3C to 3.7V; Press the open-circuit voltage that embodiment 1 identical method detects each cell, and the voltage drop of calculating each cell.After shelving 7, filter out the voltage cell faster that descends, be the big cell of self discharge, drawing the defective verification and measurement ratio of self discharge is 5%.
Comparative Examples 1:
With 10 cells that voltage drop is bigger picking out among the embodiment 1; It is changeed constant-voltage charge to electric current with the rate of charge constant-current charge of 0.2C to the 4.2V stop charging less than 0.05CA; After shelving 2 hours, detect the open-circuit voltage first of cell, again cell is shelved processing; Detect the open-circuit voltage of each cell every day; And calculate the cell voltage drop of every day, with the monomer battery voltage that draws in the Comparative Examples 1 fall with embodiment 1 in monomer battery voltage fall tabulation and compare, the result is described in table 1 below:
10 electric core voltage drops contrasts in table 1 embodiment 1 and the Comparative Examples 1
Can draw from table 1, descend more obviously by the voltage drop of the method cell of embodiment 1, thereby can filter out underproof battery faster.
Comparative Examples 2
Select arbitrarily with 100 of a collection of 7045135 Soft Roll polymer cobalts acid lithium cells; The rate of charge constant-current charge that cell is adopted 0.2C is to 4.2V; Changeing 4.2V constant-voltage charge to charging current stops less than 0.05CA; Press the open-circuit voltage that embodiment 1 identical method detects each cell, and the voltage drop of calculating each cell.After shelving 30, filter out the voltage cell faster that descends, be the big cell of self discharge, find that the defective verification and measurement ratio of self discharge is merely 3%.
Through the contrast of embodiment and Comparative Examples, be not difficult to find that adopt the inventive method to carry out the self discharge screening, monomer battery voltage descends more obvious, more helps conveniently filtering out the big cell of self discharge.Adopt the inventive method to carry out 3 embodiment of self discharge screening; The single verification and measurement ratio of its self discharge is all more than 5%, and only need can be accomplished screening in 7～10, compared with the Comparative Examples 2 (3%) of conventional screening methods; The screening cycle is shorter and verification and measurement ratio is higher; Not only improve production efficiency, can prevent effectively that also the big cell of part self discharge from influencing the performance of battery pack, thereby improved the security of battery pack.
Claims (3)
1. the screening technique of a cobalt acid lithium cell is characterized in that, may further comprise the steps:
A. discharge: the mode of samples using constant-current discharge is discharged to the attitude of discharging fully;
B. charging: the sample to obtaining among the step a carries out constant-current charge, charges to stop charging when sample voltage is 3.5～3.7V;
C. open circuit is placed: the sample that obtains among the step b is opened a way at normal temperatures placed 7～10 days, said normal temperature is 15～35 ℃;
D. screening: the sample to obtaining among the step c carries out voltage detecting, and underproof sample is selected.
2. the screening technique of a kind of cobalt acid lithium cell according to claim 1 is characterized in that the discharge-rate of constant-current discharge described in the step a is 0.1～0.2C.
3. the screening technique of a kind of cobalt acid lithium cell according to claim 1 and 2 is characterized in that the rate of charge of constant-current charge described in the step b is 0.05～0.3C.
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103272784A (en) * | 2012-11-28 | 2013-09-04 | 山东润峰集团新能源科技有限公司 | Self-discharge screening method of chargable lithium battery |
| CN103337671A (en) * | 2013-06-27 | 2013-10-02 | 国家电网公司 | Cascade utilization screening method of waste power batteries |
| CN104190639A (en) * | 2014-07-29 | 2014-12-10 | 江西世纪长河新电源有限公司 | Self-discharge screening method of lithium ion batteries |
| CN104438138A (en) * | 2014-12-08 | 2015-03-25 | 江苏华东锂电技术研究院有限公司 | Lithium ion battery screening method |
| CN104459558A (en) * | 2014-12-09 | 2015-03-25 | 江苏华东锂电技术研究院有限公司 | Lithium ion battery screening method |
| CN104979597A (en) * | 2015-06-26 | 2015-10-14 | 桐乡市众胜能源科技有限公司 | Lithium ion battery self-discharge method |
| CN105583170A (en) * | 2016-01-28 | 2016-05-18 | 珠海光宇电池有限公司 | Method for screening lithium ion batteries |
| CN106772096A (en) * | 2017-01-20 | 2017-05-31 | 国轩新能源（苏州）有限公司 | The screening technique of low-voltage lithium battery |
| CN107457194A (en) * | 2016-06-02 | 2017-12-12 | 上海国际汽车城（集团）有限公司 | A kind of power battery core echelon utilizes and screens method for group matching |
| CN108196204A (en) * | 2018-03-08 | 2018-06-22 | 珠海格力电器股份有限公司 | Method and testing device for rapidly detecting self-discharge consistency of lithium ion battery |
| CN109663756A (en) * | 2018-12-26 | 2019-04-23 | 蜂巢能源科技有限公司 | Battery core screening technique and medium based on self-discharge rate |
| CN110045290A (en) * | 2019-04-25 | 2019-07-23 | 上海空间电源研究所 | A kind of lithium-ions battery internal short-circuit latent defect lossless detection method |
| CN113466727A (en) * | 2021-07-07 | 2021-10-01 | 广州鹏辉能源科技股份有限公司 | Battery self-discharge screening method and device, terminal equipment and readable storage medium |
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| CN104190639A (en) * | 2014-07-29 | 2014-12-10 | 江西世纪长河新电源有限公司 | Self-discharge screening method of lithium ion batteries |
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| CN105583170B (en) * | 2016-01-28 | 2017-12-26 | 珠海光宇电池有限公司 | A kind of screening technique of lithium ion battery |
| CN105583170A (en) * | 2016-01-28 | 2016-05-18 | 珠海光宇电池有限公司 | Method for screening lithium ion batteries |
| CN107457194A (en) * | 2016-06-02 | 2017-12-12 | 上海国际汽车城（集团）有限公司 | A kind of power battery core echelon utilizes and screens method for group matching |
| CN106772096A (en) * | 2017-01-20 | 2017-05-31 | 国轩新能源（苏州）有限公司 | The screening technique of low-voltage lithium battery |
| CN108196204A (en) * | 2018-03-08 | 2018-06-22 | 珠海格力电器股份有限公司 | Method and testing device for rapidly detecting self-discharge consistency of lithium ion battery |
| CN109663756A (en) * | 2018-12-26 | 2019-04-23 | 蜂巢能源科技有限公司 | Battery core screening technique and medium based on self-discharge rate |
| CN110045290A (en) * | 2019-04-25 | 2019-07-23 | 上海空间电源研究所 | A kind of lithium-ions battery internal short-circuit latent defect lossless detection method |
| CN113671391A (en) * | 2021-06-28 | 2021-11-19 | 国联汽车动力电池研究院有限责任公司 | Detection method for micro/short circuit signal identification early warning of lithium ion battery |
| CN113671391B (en) * | 2021-06-28 | 2024-03-12 | 国联汽车动力电池研究院有限责任公司 | Detection method for lithium ion battery micro/short circuit signal identification and early warning |
| CN113466727A (en) * | 2021-07-07 | 2021-10-01 | 广州鹏辉能源科技股份有限公司 | Battery self-discharge screening method and device, terminal equipment and readable storage medium |
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Application publication date: 20121017 |