CN1780041A - Chemosynthetic post treatment for high-energy lithium ion cell - Google Patents
Chemosynthetic post treatment for high-energy lithium ion cell Download PDFInfo
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- CN1780041A CN1780041A CNA2004100729338A CN200410072933A CN1780041A CN 1780041 A CN1780041 A CN 1780041A CN A2004100729338 A CNA2004100729338 A CN A2004100729338A CN 200410072933 A CN200410072933 A CN 200410072933A CN 1780041 A CN1780041 A CN 1780041A
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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
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
A post-treating method after formation for high-energy Li ion batter to improve the surface stability of electrodes includes such steps as cyclic charging and discharging by 1/3 of rated current at 20 +/- 5 deg.C three time (the voltage range is 2.75-4.2V), charging to 4.2V by 1/3 of rated current at 20 +/- 5 deg.C, discharging to 2.5-2.75V by 1/3 of rated current at -30- -20 deg.C, and repeating the step 2 and 3 three times.
Description
Technical field
The invention belongs to lithium-ions battery and change into the post-processing technology field, particularly relate to a kind of formation after processing method of high energy lithium ion cell.
Background technology
Along with popularizing of green energy resource, the range of application of high energy lithium ion cell more and more widely, but its safety issue hampers its development always, at present, processing method after high energy lithium ion cell changes into is: the battery after will changing into is with the little electric current constant current charge between 0.01 multiplying power～0.2 multiplying power, charging interval is 0.2～5 hour, again with the big electric current constant current charge between 0.2 multiplying power～3 multiplying powers, after being charged to cell voltage and being 4.1～4.2 volts, allow battery enter the constant voltage charge stage again, voltage remains between 4.1 volts～4.2 volts, when electric current to be charged is reduced to 0.001 multiplying power～0.02 multiplying power, promptly stops charging.Subsequently battery is carried out constant-current discharge, electric current is 0.01 multiplying power～0.5 multiplying power, and discharge cut-off voltage is 2.5 volts～2.75 volts, and then battery is charged with above-mentioned charging method again.Allow battery shelve with full power state, the time of shelving is 3～10 days.With constant current battery is discharged subsequently, electric current is 0.1 multiplying power～1 multiplying power, and discharge cut-off voltage is 2.5 volts～2.75 volts.With constant current battery is charged at last, electric current is 0.1 multiplying power～1 multiplying power, and charging capacity is 25% rated capacity.Whole process treatment process is finished.The battery cycle that this method was handled is short, and helps improving the service efficiency of battery material, but under abuse condition, is easy to occur on fire and explosion phenomenon.
Summary of the invention
The present invention is for solving problems of the prior art, provide a kind of easy to operate, technical process simple, can effectively improve the formation after processing method of the high energy lithium ion cell of battery security.
The technical scheme that the present invention takes for the technical problem that exists in the solution known technology is:
A kind of formation after processing method of high energy lithium ion cell, battery after being characterized in changing into, be under 20 ℃ ± 5 ℃ the environment in temperature, electric current with described battery 1/3 multiplying power carries out charge and discharge cycles to battery, the charging/discharging voltage scope is between 2.75V～4.2V, then under temperature is 20 ℃ ± 5 ℃ environment, electric current with described battery 1/3 multiplying power charges to battery, charge to voltage when being 4.2V, again under temperature is-30 ℃～-20 ℃ environment, electric current with described battery 1/3 multiplying power discharges to battery, and discharge cut-off voltage is 2.5-2.75V.
The present invention can also adopt following technical measures to realize:
The formation after processing method of high energy lithium ion cell is characterized in that temperature is to discharge and recharge under 20 ℃ ± 5 ℃ the environment, and the charge and discharge cycles number of times of charging/discharging voltage scope between 2.75V～4.2V is 3 times.
The formation after processing method of high energy lithium ion cell is characterized in that temperature is 20 ℃ ± 5 ℃ environment charging down, and temperature is-30 ℃～-20 ℃ environment discharge down, and discharge cut-off voltage is 2.5V.
The formation after processing method of high energy lithium ion cell is characterized in 20 ℃ ± 5 ℃ temperature chargings, and the cycle-index of-30 ℃～-20 ℃ temperature discharges is 3 times.
Advantage and good effect that the present invention has are: by adopting the battery that changes into reprocessing has been carried out normal temperature circulation and K cryogenic treatment, strengthened the stability of electrode surface effectively, make electrode surface SEI film fine and close more, firm, thereby improve the security performance of high energy lithium ion cell.And process is simple, control easily, and the cost of equipment needed thereby is also lower.
Description of drawings
Fig. 1 is the battery short circuit curve chart of the embodiment of the invention 1;
Fig. 2 is the battery overcharge curve chart of the embodiment of the invention 1;
Fig. 3 is the battery multiplying power discharging capacity curve figure of the embodiment of the invention 1;
Fig. 4 is the battery temperature discharge capacity curve chart of the embodiment of the invention 1;
Fig. 5 is the cycle performance of battery curve chart of the embodiment of the invention 1.
Embodiment
For further understanding summary of the invention of the present invention, characteristics and effect, enumerate following examples now, and conjunction with figs. is described in detail as follows:
Embodiment:
By mass percentage, 80%～95% cobalt acid lithium and 3%～10% KS, SS acetylene black are as conductive agent, 3%～11% polytetrafluoroethylene, Kynoar, a kind of in the polymer resin as binding agent, with N-methyl pyrrolidone or dimethylformamide, dimethylacetylamide is made solvent, the furnishing lotion, make collector with the aluminium foil that 20um is thick, creme is applied on the aluminium foil, and drying, operation such as rolling are made positive plate; By mass percentage, 85%～92% MCMB, CMS be as negative electrode active material, with 3%～11% KS, SS acetylene black as conductive agent, 3%～11% polytetrafluoroethylene, Kynoar, a kind of in the polymer resin as binding agent, with N-methyl pyrrolidone or dimethylformamide, dimethylacetylamide is made solvent, the furnishing lotion,, make collector with the Copper Foil that 10um is thick, creme is coated onto on the Copper Foil, and drying, the rolling negative plate of making; Selecting thickness for use is that the composite membrane of acrylic resin between 30um～50un and polyvinyl resin is as barrier film; Dicyandiamide solution is the ternary mixture of matrix with EC, and electrolyte is selected LiPF6 for use, and electric liquid model is that JN908 is as organic nonaqueous electrolyte; Positive/negative plate is cut into suitable size, be wound into electric core with barrier film, put into shell,, inject electrolyte then and liquid injection port is shut shell and cover plate argon arc welded seal, it is changed into, battery after changing into is under 20 ℃ ± 5 ℃ the environment in temperature, with the electric current of described battery 1/3 multiplying power battery is carried out charge and discharge cycles, the charging/discharging voltage scope is between 2.75V～4.2V, and the charge and discharge cycles number of times is 3 times; Then under temperature is 20 ℃ ± 5 ℃ environment, electric current with described battery 1/3 multiplying power charges to battery, charge to voltage when being 4.2V, again under temperature is-30 ℃～-20 ℃ environment, electric current with described battery 1/3 multiplying power discharges to battery, the cycle-index that discharges and recharges is 3 times, and discharge cut-off voltage is 2.5V.
For advantage of the present invention can be described, be example with 50/380 (55Ah) type battery, in conjunction with Figure of description battery performance is carried out following explanation:
Fig. 1 is short circuit test figure, and in ambient temperature being under 20 ℃ ± 5 ℃ the condition, will expire battery through external short circuit, and outside line resistance should be less than 10m Ω.The maximum current of battery is 298.24A among Fig. 1, and maximum temperature is 115.34 ℃, and voltage platform is 2.23V, and in the whole experiment, battery is not on fire, do not explode.Fig. 2 is the lab diagram of overcharging of battery, in ambient temperature is under 20 ℃ ± 5 ℃ the condition, with 1 multiplying power electric current full battery to be charged, and when cell voltage is charged to 5.0V, stops to charge, and the maximum temperature of battery is 53.36 ℃ among Fig. 2, and ceiling voltage is 5.0V.In the whole experiment, battery is not on fire, do not explode.Fig. 3 is the multiplying power discharging capacity curve figure of battery, is that the electric current with 0.5 multiplying power, 1 multiplying power, 2 multiplying powers discharges to battery respectively under 20 ℃ ± 5 ℃ the condition in ambient temperature, and discharge cut-off voltage is 3.0V.Discharge capacity is respectively 58.33Ah, 55.33Ah, 51.36Ah.Discharge capacity with 0.5 multiplying power is a benchmark, and the discharge capacitance of 1 multiplying power, 2 multiplying powers is respectively 94.9% and 88.1%.Fig. 4 is the discharge capacity curve of battery under different temperatures, is respectively in ambient temperature under-20 ℃, 25 ℃, 55 ℃ the condition, with the electric current of 1/3 multiplying power battery is discharged, and discharge capacity is respectively 56.45Ah, 60.31Ah, 61.75Ah.With normal temperature (25 ℃) capacity is benchmark, and ambient temperature is respectively 93.6% and 102% for the capability retention of-20 ℃ and 55 ℃.Fig. 5 is the cycle performance curve of battery, in ambient temperature is under 20 ℃ ± 5 ℃ the condition, with 1/3 multiplying power electric current battery to be discharged and recharged, and the charging/discharging voltage scope is 3.0V～4.2V.The initial capacity of battery is 56.94Ah, and the 50th time discharge capacity is 50.12Ah.After 50 circulations, the capability retention of battery is 91% of a rated capacity.
For further specifying advantage of the present invention, be example with 55Ah type battery, provided and used prior art and with the safety test situation table of comparisons of treatment of battery of the present invention:
| Content of the test | Adopt prior art | Adopt the present invention |
| Short circuit | On fire, blast | Not on fire, do not explode |
| Overcharge | On fire, blast | Not on fire, do not explode |
Battery multiplying power discharging characteristic at normal temperatures
| Multiplying power state/C | Discharging current/A | Discharge capacity/Ah | State-of-charge/% |
| 0.5 | 27.5 | 58.33 | 100 |
| 1 | 55 | 55.33 | 94.9 |
| 2 | 110 | 51.36 | 88.1 |
The flash-over characteristic of battery under different temperatures
| T/℃ | -20 | 25 | 55 |
| Capacity/Ah | 56.45 | 60.31 | 61.75 |
| Conservation rate/% | 93.6 | 100 | 102 |
Claims (4)
1. the formation after processing method of a high energy lithium ion cell, it is characterized in that: the battery after changing into, be under 20 ℃ ± 5 ℃ the environment in temperature, electric current with described battery 1/3 multiplying power carries out charge and discharge cycles to battery, the charging/discharging voltage scope is between 2.75V～4.2V, then under temperature is 20 ℃ ± 5 ℃ environment, electric current with described battery 1/3 multiplying power charges to battery, charge to voltage when being 4.2V, again under temperature is-30 ℃～-20 ℃ environment, electric current with described battery 1/3 multiplying power discharges to battery, and discharge cut-off voltage is 2.5-2.75V.
2. the formation after processing method of high energy lithium ion cell according to claim 1 is characterized in that: described temperature is to discharge and recharge under 20 ℃ ± 5 ℃ the environment, and the charge and discharge cycles number of times of charging/discharging voltage scope between 2.75V～4.2V is 3 times.
3. the formation after processing method of high energy lithium ion cell according to claim 1 is characterized in that: described temperature is 20 ℃ ± 5 ℃ environment charging down, and described temperature be that-30 ℃～-20 ℃ environment discharges down, and discharge cut-off voltage is 2.5V.
4. the formation after processing method of high energy lithium ion cell according to claim 3, it is characterized in that: the described cycle-index that discharges and recharges is 3 times.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2004100729338A CN1780041A (en) | 2004-11-26 | 2004-11-26 | Chemosynthetic post treatment for high-energy lithium ion cell |
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| CNA2004100729338A CN1780041A (en) | 2004-11-26 | 2004-11-26 | Chemosynthetic post treatment for high-energy lithium ion cell |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101212067B (en) * | 2006-12-29 | 2010-10-13 | 上海比亚迪有限公司 | Li-ion secondary battery formation method |
| CN101714673B (en) * | 2009-11-18 | 2012-06-06 | 中国科学院上海微系统与信息技术研究所 | Method for improving storage/shelving performance of lithium ion battery |
| CN103094635A (en) * | 2011-10-27 | 2013-05-08 | 广州鹏辉能源科技股份有限公司 | Method for improving stability of lithium iron phosphate battery |
| CN107528091A (en) * | 2017-06-29 | 2017-12-29 | 青岛恒金源电子科技有限公司 | A kind of lithium ion battery intelligence chemical synthesizing method |
-
2004
- 2004-11-26 CN CNA2004100729338A patent/CN1780041A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101212067B (en) * | 2006-12-29 | 2010-10-13 | 上海比亚迪有限公司 | Li-ion secondary battery formation method |
| CN101714673B (en) * | 2009-11-18 | 2012-06-06 | 中国科学院上海微系统与信息技术研究所 | Method for improving storage/shelving performance of lithium ion battery |
| CN103094635A (en) * | 2011-10-27 | 2013-05-08 | 广州鹏辉能源科技股份有限公司 | Method for improving stability of lithium iron phosphate battery |
| CN103094635B (en) * | 2011-10-27 | 2015-04-29 | 广州鹏辉能源科技股份有限公司 | Method for improving stability of lithium iron phosphate battery |
| CN107528091A (en) * | 2017-06-29 | 2017-12-29 | 青岛恒金源电子科技有限公司 | A kind of lithium ion battery intelligence chemical synthesizing method |
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