CN101562264B - Method for preparing lithium-ion battery core - Google Patents
Method for preparing lithium-ion battery core Download PDFInfo
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- CN101562264B CN101562264B CN2009101074340A CN200910107434A CN101562264B CN 101562264 B CN101562264 B CN 101562264B CN 2009101074340 A CN2009101074340 A CN 2009101074340A CN 200910107434 A CN200910107434 A CN 200910107434A CN 101562264 B CN101562264 B CN 101562264B
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- ion battery
- preparation
- lithium ion
- negative plate
- positive plate
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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
The invention discloses a method for preparing a lithium-ion battery core, comprising the following steps of 1) preparing a positive plate, a negative plate and diaphragm paper; and 2) preparing an electric core by the positive plate, the negative plate and the diaphragm paper, and arranging the positive plate, the negative plate and the diaphragm paper sequentially between two layers of terylene resin films, carrying out hot-composing to obtain a complex consisting of the positive plate, the diaphragm paper and the negative plate; preparing a monomer electric core by two or more complexes andpreparing the electric core by connecting the monomer electric cores in parallel or in series. The lithium-iron battery core prepared by the method can effectively control the irregular expansion of the lithium-iron battery core and lead the appearance of the lithium-iron battery to be smooth and regular.
Description
Technical field
The present invention relates to the lithium battery field, relate in particular to a kind of preparation method of lithium ion battery cell.
Background technology
Lithium ion battery has been applied to people's daily life field and national defence field more and more at large, and its production technology is also advanced in development always, and is wherein maximum to the improvement of material.And it is fewer for the improvement of lithium ion battery preparation process, lithium-ion electric core generally is prepared as follows: make positive plate, negative plate earlier, in the middle of positive and negative plate, assign barrier film then, superpose or be wound into single electric core by putting in order of positive plate, barrier film, negative plate, single electric core is in parallel or be connected into electric core.The operation of whole electric core being carried out the hot pressing shaping before and after changing into is also arranged, with the irregular deformation of part leveling battery.Employing is produced electric core with upper type, although work efficiency than higher, all is difficult to eliminate enduringly on the whole the irregular deformation of battery; Simultaneously, because stressed inhomogeneous during hot pressing, the capacity of heat transmission inconsistent also might produce fatal damage to the part of battery.Yi Shang existing method in addition, generally all be after battery liquid-filling is finished, battery is carried out the hot pressing shaping, the suffered pressure and temperature of battery this moment is lost by the extruding of electrolyte in the battery and hot volatilization loss, variation all have bigger influence, therefore, can produce certain influence to the overall performance of battery.
Summary of the invention
The problem that the present invention mainly solves is to provide a kind of preparation method of lithium ion battery cell, prepares the irregular expansion that lithium ion battery cell can effectively be controlled lithium ion battery with this method, makes the outward appearance of lithium ion battery accomplish smooth, regular.
For addressing the above problem, the present invention adopts following technical scheme:
A kind of preparation method of lithium ion battery cell may further comprise the steps:
1) preparation positive plate, negative plate: with positive active material and negative electrode active material respectively attached to positive plate metal collector and negative plate metal collector surface; Prepare diaphragm paper: polyvinylidene fluoride is dissolved in acetone or the N-methyl pyrrolidone obtains solution, allow polyethylene or polypropylene stretched film from above-mentioned solution, soak, make it evenly coated, and oven dry, form one deck tack coat on stretched film, the thickness of described tack coat is 5 microns;
2) prepare electric core: according to the order of positive pole, diaphragm paper, negative pole with above-mentioned positive plate, negative plate and diaphragm paper stacked arrangement, and the three placed in the middle of the two-layer polyester resin film, it is compound to carry out heat, obtain the complex formed by positive plate, diaphragm paper and negative plate, two or more complexs are made monomer electricity core;
3) described monomer electricity core is made lithium-ion electric core by in parallel or series connection.
Described positive active material comprises lithium compound active material, conductive agent, bonding agent and solvent.
The material that the metal collector of described positive plate adopts is aluminium foil or aluminium net.
Described negative electrode active material comprises graphitic carbon material, conductive agent, bonding agent and solvent.
The material that the metal collector of described negative plate adopts is Copper Foil or copper mesh.
The concentration of ordinary dissolution of described polyvinylidene fluoride is 0.5-30%.
Positive plate, diaphragm paper and negative plate in the step 3), the three carries out heat in hot-press equipment or rolling equipment compound.
The compound pressure of heat is 0-10kgf/cm in the step 3)
2
Preferably, the compound pressure of heat is 2kgf/cm
2
The compound temperature of heat is 20-95 ℃ in the step 3).
Preferably, the compound temperature of heat is 60 ℃.
Time hot compound in the step 3) is for being less than 5min.
Preferably, the compound time of heat is 2min.
Prepare lithium ion battery cell with the method for the invention, because positive plate, diaphragm paper and negative plate hot pressing are combined into complex, described complex is as a whole, its consistent, distortion unanimity that expands, be assembled into electric core with described complex again, described electric core has the consistent characteristics that expand, the local deformation that can effectively suppress lithium ion battery, therefore, the varied in thickness that can effectively suppress lithium ion battery on the whole, effectively the irregular expansion of control lithium ion battery makes the outward appearance of lithium ion battery accomplish smooth, regular.
The method of the invention is particularly suitable for preparing the large-sized power lithium ion battery cell.
Description of drawings
Fig. 1 adopts the capacity of lithium ion battery of the lithium ion battery cell of the inventive method preparation to detect the datacycle comparison diagram.
Fig. 2 adopts the capacity of lithium ion battery ratio of the lithium ion battery cell of the inventive method preparation to detect the datacycle comparison diagram.
Embodiment
A kind of preparation method of lithium ion battery cell may further comprise the steps:
1) preparation positive plate, the metal collector of described positive plate adopts aluminium foil or aluminium net, described positive active material comprises lithium compound active material, conductive agent, bonding agent and solvent, positive active material is coated in aluminium foil or aluminium is online, and add the online unnecessary positive active material of heat abstraction aluminium foil or aluminium, be pressed into certain thickness with roll squeezer again, be cut into the strip positive plate;
2) preparation negative plate, the metal collector of described negative plate adopts Copper Foil or copper mesh, described negative electrode active material comprises graphitic carbon material, conductive agent, bonding agent and solvent, negative electrode active material is coated on Copper Foil or the copper mesh, and add negative electrode active material unnecessary on heat abstraction Copper Foil or the copper mesh, be pressed into certain thickness with roll squeezer again, be cut into the strip negative plate;
3) preparation diaphragm paper, to gather carboxylic tetrafluoroethene (PVDF) is dissolved in the N-methyl pyrrolidone (NMP) and obtains solution, the concentration of ordinary dissolution of poly-carboxylic tetrafluoroethene is 20%, allow and from above-mentioned solution, soaked on the polyethylene stretched film, make it evenly coated, oven dry forms one deck tack coat on polyethylene (PE) stretched film, the thickness of described tack coat is 5 microns, is cut into the strip diaphragm paper;
Described solution can also be that poly-carboxylic tetrafluoroethene is dissolved in the acetone; Can also be that polyvinylidene fluoride is dissolved in N-methyl pyrrolidone or the acetone;
Except using the polyethylene stretched film, can also adopt polypropylene (PP) stretched film;
4) utilize above-mentioned positive plate, negative plate and diaphragm paper to prepare electric core, order according to positive plate, diaphragm paper, negative plate is arranged the three, and the three placed in the middle of the two-layer polyester resin film, it is compound to carry out heat at the good hot-press equipment of preheating, and the compound pressure of heat is 2kgf/cm
2, the compound temperature of heat is 60 ℃, and heat is 2min the compound time, obtains the complex is made up of positive plate, diaphragm paper and negative plate, and three complexs are made monomer electricity core, and three electric cores of monomer are made lithium-ion electric core by parallel connection or series system.
The effect of polyester resin film is to protect positive plate and negative plate not to be damaged by pressure in hot recombination process.
Adopt the lithium ion battery cell of the method for the invention preparation to have on-deformable advantage.
Lithium ion battery with lithium-ion electric core preparation of the present invention: the many and multiplying power discharging property height of cycle-index, specifically referring to Fig. 1 and Fig. 2, capacity is 2700 milliamperes a lithium ion battery, when it circulates nearly 270 times the time, capacity still is higher than 1800 milliamperes, when its circulation 500 times the time, its available capacity is than still being higher than 85%.
Claims (10)
1. the preparation method of a lithium ion battery cell may further comprise the steps:
1) preparation positive plate, negative plate: with positive active material and negative electrode active material respectively attached to positive plate metal collector and negative plate metal collector surface; Prepare diaphragm paper: polyvinylidene fluoride is dissolved in acetone or the N-methyl pyrrolidone obtains solution, allow polyethylene or polypropylene stretched film from above-mentioned solution, soak, make it evenly coated, and oven dry, form one deck tack coat on stretched film, the thickness of described tack coat is 5 microns;
2) prepare electric core: according to the order of positive pole, diaphragm paper, negative pole with above-mentioned positive plate, negative plate and diaphragm paper stacked arrangement, and the three placed in the middle of the two-layer polyester resin film, it is compound to carry out heat, obtain the complex formed by positive plate, diaphragm paper and negative plate, two or more complexs are made monomer electricity core;
3) described monomer electricity core is made lithium-ion electric core by in parallel or series connection.
2. the preparation method of a kind of lithium ion battery cell according to claim 1, it is characterized in that: described positive active material comprises lithium compound active material, conductive agent, bonding agent and solvent.
3. the preparation method of a kind of lithium ion battery cell according to claim 1 and 2 is characterized in that: the material that the metal collector of described positive plate adopts is aluminium foil or aluminium net.
4. the preparation method of a kind of lithium ion battery cell according to claim 1, it is characterized in that: described negative electrode active material comprises graphitic carbon material, conductive agent, bonding agent and solvent.
5. according to the preparation method of claim 1 or 4 described a kind of lithium ion battery cells, it is characterized in that: the material that the metal collector of described negative plate adopts is Copper Foil or copper mesh.
6. the preparation method of a kind of lithium ion battery cell according to claim 1, it is characterized in that: the concentration of ordinary dissolution of described polyvinylidene fluoride is 0.5-30%.
7. the preparation method of a kind of lithium ion battery cell according to claim 1 is characterized in that: step 2) in positive plate, diaphragm paper and negative plate to carry out heat in hot-press equipment or rolling equipment compound.
8. according to the preparation method of claim 1 or 7 described a kind of lithium ion battery cells, it is characterized in that: step 2) in heat compound pressure be 0-10kgf/cm
2
9. according to the preparation method of claim 1 or 7 described a kind of lithium ion battery cells, it is characterized in that: step 2) in heat compound temperature be 20-95 ℃.
10. according to the preparation method of claim 1 or 7 described a kind of lithium ion battery cells, it is characterized in that: step 2) in compound time of heat for being less than 5min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101074340A CN101562264B (en) | 2009-05-19 | 2009-05-19 | Method for preparing lithium-ion battery core |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101074340A CN101562264B (en) | 2009-05-19 | 2009-05-19 | Method for preparing lithium-ion battery core |
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| CN101562264A CN101562264A (en) | 2009-10-21 |
| CN101562264B true CN101562264B (en) | 2010-07-14 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104466254A (en) * | 2014-10-27 | 2015-03-25 | 深圳市比克电池有限公司 | Lithium ion battery, lithium ion battery pack and lithium ion battery module |
| CN112670592A (en) * | 2019-10-16 | 2021-04-16 | 北京卫蓝新能源科技有限公司 | Pole piece and diaphragm compounding process and lithium battery cell preparation process |
| CN112803119A (en) * | 2021-02-20 | 2021-05-14 | 天津谦同新能源科技有限公司 | Spinning diaphragm and electrode compounding method and integrated structure processed by same |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6024773A (en) * | 1996-12-26 | 2000-02-15 | Mitsushita Denki Kabushiki Kaisha | Method of fabricating a lithium ion secondary battery |
| CN1398441A (en) * | 2000-12-07 | 2003-02-19 | Tdk株式会社 | Electrode compsn. and lithium secondary battery |
| CN1619861A (en) * | 2003-11-17 | 2005-05-25 | 三星Sdi株式会社 | Negative electrode for rechargeable lithium battery and rechargeable lithium battery comprising same |
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2009
- 2009-05-19 CN CN2009101074340A patent/CN101562264B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6024773A (en) * | 1996-12-26 | 2000-02-15 | Mitsushita Denki Kabushiki Kaisha | Method of fabricating a lithium ion secondary battery |
| CN1398441A (en) * | 2000-12-07 | 2003-02-19 | Tdk株式会社 | Electrode compsn. and lithium secondary battery |
| CN1619861A (en) * | 2003-11-17 | 2005-05-25 | 三星Sdi株式会社 | Negative electrode for rechargeable lithium battery and rechargeable lithium battery comprising same |
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| CN101562264A (en) | 2009-10-21 |
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