CN104124412A - Dry unidirectional stretching method for manufacturing lithium battery diaphragm - Google Patents
Dry unidirectional stretching method for manufacturing lithium battery diaphragm Download PDFInfo
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- CN104124412A CN104124412A CN201310147135.6A CN201310147135A CN104124412A CN 104124412 A CN104124412 A CN 104124412A CN 201310147135 A CN201310147135 A CN 201310147135A CN 104124412 A CN104124412 A CN 104124412A
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- mass percent
- dry
- ldpe
- lithium battery
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/403—Manufacturing processes of separators, membranes or diaphragms
-
- 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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- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Cell Separators (AREA)
Abstract
The invention relates to a dry unidirectional stretching method for manufacturing a lithium battery diaphragm. The method is as below: mixing 75-93 wt.% of polypropylene, 0.1-8 wt.% of sorbitol, 0.1-6 wt.% of a reinforced material and 5-16 wt.% of oil by a mixing machine, and extruding the materials by a twin screw extruder to produce a first granule material; mixing 89-96 wt.% of low density polyethylene and 1-12 wt.% of a reinforced material by a mixing machine, and extruding the materials by a twin screw extruder to produce a second granule material; mixing the first granule material and the second granule material according to a certain proportion, and preparing the mixed material into a diaphragm by an extruder; and successively conducting unidirectional stretching pore production, heat setting and rolling. The diaphragm produced by the method has good basic performance namely good pore uniformity, which is also the most important qualified index for the diaphragm; and the small equipment investment of the method is only 1/7 of that for other principles or manufacturing method under the same yield, so that the production cost is low; and the diaphragm is superb for application to a power battery, and can greatly reduce the cost of the battery and improve the safety of the battery.
Description
Technical field
The present invention relates to a kind of production method of lithium battery septation, be specifically related to the production method that lithium battery diaphragm is manufactured in dry method simple tension.
Background technology
Domestic very late to the understanding of lithium ion battery separator, be along with lithium electricity is just familiar with in Chinese foundation.Because a lot of enterprises recognize that this is a profit, market and prospect be a very large emerging industry all, thereby want to set foot in this field, but what abroad in this technical field, take is the policy that China is blocked, its understanding of domestic technique bound pair is more shallow, also, in the stage of fumbling, cannot produce so far quality qualified product completely, this situation has caused the concern of governments at all levels of both the central and local governments and scientific research department.
Summary of the invention
The production method that the object of the invention is to solve problems of the prior art and provide a kind of dry method simple tension to manufacture lithium battery diaphragm, it can solve, and current barrier film pore-creating is inhomogeneous, batch unstable, machinery equipment and the undue very complicated problem of technique.
Technical scheme of the present invention is achieved in that
The production method of lithium battery diaphragm is manufactured in dry method simple tension, carries out in accordance with the following steps:
Step 1: select polypropylene (PP), low density polyethylene (LDPE) (LDPE), sorbierite (C6H14O6), grease and reinforcing material as raw material;
Step 2: after the grease that the reinforcing material that the sorbierite that the polypropylene that is 75-93% by mass percent (PP), mass percent are 0.1-8%, mass percent are 0.1-6%, mass percent are 5-16% combines by batch mixer, through super-dry, process again, by double screw extruder extruding pelletization, make the first particulate material; After the reinforcing material that the low density polyethylene (LDPE) that is 89-96% by mass percent (LDPE), mass percent are 1-12% combines by batch mixer, then process through super-dry, by double screw extruder extruding pelletization, make the second particulate material;
Step 3: the first particulate material in step 2 is mixed and formed compound to 1:2 by 1:3 with the second particulate material, then after super-dry is processed, this compound is passed through to extrusion mechanism film forming;
Step 4: simple tension pore-creating;
Step 5: thermal finalization;
Step 6: rolling.
Reinforcing material in described step 1 is ultra-high molecular weight polyethylene.
In described step 3, extrusion temperature is 160-220 degree Celsius during by extruder.
Temperature in described step 4 during simple tension pore-creating is 90-130 degree Celsius, and rate of extension is 20-60 m/min, and extensibility is 220%.
In described step 5, the time of thermal finalization is 200-600 minute, and temperature is 90-130 degree Celsius.
Adopt now the simple dry process without any pollution, its good effect is: the most basic performance of film is that the uniformity in hole is very good, is also the topmost qualified index of film; And equipment investment is few, the in the situation that of same output, equipment investment is 1/7 of other principles or manufacture method, and production cost is lower; And can manufacture polyethylene or polypropylene screen, it is extraordinary that polypropylene screen is used on electrokinetic cell, if need the thickness of 30 microns with polyethylene or trilamellar membrane, used so polypropylene screen 25 micron thickness just, and can greatly reduce battery cost and improve battery security.Because polyacrylic closed pore temperature is than the closed pore temperature Senior Three of polypropylene screen ten degree.And domestic also do not have factory to grasp simultaneously can be by the method for low density polyethylene (LDPE) or polypropylene masking.
In the middle of the method, raw material polypropylene and low density polyethylene (LDPE) are by the effect of sorbierite, grease, ultra-high molecular weight polyethylene, raw material has been carried out to modification, can make up polypropylene, low density polyethylene (LDPE) performance deficiency separately, and the mechanical performance compare of the anti-puncture of polypropylene and low density polyethylene (LDPE) is poor, by adding ultra-high molecular weight polyethylene, can significantly improve the puncture resistance of barrier film; Because polyacrylic pliability is poorer than low density polyethylene (LDPE), so want the two to mix to 1:2 according to 1:3, can significantly improve the toughness of barrier film, can effectively guarantee the quality of product.
Embodiment
embodiment 1:the production method of lithium battery diaphragm is manufactured in this dry method simple tension, carries out in accordance with the following steps:
Step 1: select polypropylene (PP), low density polyethylene (LDPE) (LDPE), sorbierite (C6H14O6), grease and reinforcing material as raw material;
Step 2: after the grease that the reinforcing material that the sorbierite that the polypropylene that is 75% by mass percent (PP), mass percent are 8%, mass percent are 6%, mass percent are 11% combines by batch mixer, pass through again the dry processing of drying machine, by double screw extruder extruding pelletization, make the first particulate material; After the reinforcing material that the low density polyethylene (LDPE) that is 89% by mass percent (LDPE), mass percent are 11% combines by batch mixer, then pass through the dry processing of drying machine, by double screw extruder extruding pelletization, make the second particulate material;
Step 3: the first particulate material in step 2 is mixed and formed compound by 1:3 with the second particulate material, then through this compound being passed through to extrusion mechanism film forming after the dry processing of drying machine;
Step 4: simple tension pore-creating;
Step 5: thermal finalization;
Step 6: rolling.
Reinforcing material in described step 1 is ultra-high molecular weight polyethylene.
In described step 3, extrusion temperature is 160 degrees Celsius during by extruder.
Temperature in described step 4 during simple tension pore-creating is 90 degrees Celsius, and rate of extension is 20 ms/min, and extensibility is 220%.
In described step 5, the time of thermal finalization is 200 minutes, and temperature is 90 degrees Celsius.
embodiment 2:the production method of lithium battery diaphragm is manufactured in this dry method simple tension, carries out in accordance with the following steps: step 1: select polypropylene (PP), low density polyethylene (LDPE) (LDPE), sorbierite (C6H14O6), grease and reinforcing material as raw material;
Step 2: after the grease that the reinforcing material that the sorbierite that the polypropylene that is 93% by mass percent (PP), mass percent are 0.1%, mass percent are 0.1%, mass percent are 6.8% combines by batch mixer, pass through again the dry processing of drying machine, by double screw extruder extruding pelletization, make the first particulate material; After the reinforcing material that the low density polyethylene (LDPE) that is 96% by mass percent (LDPE), mass percent are 4% combines by batch mixer, then pass through the dry processing of drying machine, by double screw extruder extruding pelletization, make the second particulate material;
Step 3: the first particulate material in step 2 is mixed and formed compound by 1:2 with the second particulate material, then through this compound being passed through to extrusion mechanism film forming after the dry processing of drying machine;
Step 4: simple tension pore-creating;
Step 5: thermal finalization;
Step 6: rolling.
Reinforcing material in described step 1 is ultra-high molecular weight polyethylene.
In described step 3, extrusion temperature is 220 degrees Celsius during by extruder.
Temperature in described step 4 during simple tension pore-creating is 130 degrees Celsius, and rate of extension is 60 ms/min, and extensibility is 220%.
In described step 5, the time of thermal finalization is 600 minutes, and temperature is 130 degrees Celsius.
embodiment 3:the production method of lithium battery diaphragm is manufactured in this dry method simple tension, carries out in accordance with the following steps: step 1: select polypropylene (PP), low density polyethylene (LDPE) (LDPE), sorbierite (C6H14O6), grease and reinforcing material as raw material;
Step 2: after the grease that the reinforcing material that the sorbierite that the polypropylene that is 80% by mass percent (PP), mass percent are 6%, mass percent are 4%, mass percent are 10% combines by batch mixer, pass through again the dry processing of drying machine, by double screw extruder extruding pelletization, make the first particulate material; After the reinforcing material that the low density polyethylene (LDPE) that is 92% by mass percent (LDPE), mass percent are 8% combines by batch mixer, then pass through the dry processing of drying machine, by double screw extruder extruding pelletization, make the second particulate material;
Step 3: the first particulate material in step 2 is mixed and formed compound by 1:3 with the second particulate material, then through this compound being passed through to extrusion mechanism film forming after the dry processing of drying machine;
Step 4: simple tension pore-creating;
Step 5: thermal finalization;
Step 6: rolling.
Reinforcing material in described step 1 is ultra-high molecular weight polyethylene.
In described step 3, extrusion temperature is 200 degrees Celsius during by extruder.
Temperature in described step 4 during simple tension pore-creating is 100 degrees Celsius, and rate of extension is 40 ms/min, and extensibility is 220%.
In described step 5, the time of thermal finalization is 400 minutes, and temperature is 100 degrees Celsius.
embodiment 4:the production method of lithium battery diaphragm is manufactured in dry method simple tension, carries out in accordance with the following steps:
Step 1: select polypropylene (PP), low density polyethylene (LDPE) (LDPE), sorbierite (C6H14O6), grease and reinforcing material as raw material;
Step 2: after the grease that the reinforcing material that the sorbierite that the polypropylene that is 85% by mass percent (PP), mass percent are 5%, mass percent are 5%, mass percent are 5% combines by batch mixer, pass through again the dry processing of drying machine, by double screw extruder extruding pelletization, make the first particulate material; After the reinforcing material that the low density polyethylene (LDPE) that is 90% by mass percent (LDPE), mass percent are 10% combines by batch mixer, then pass through the dry processing of drying machine, by double screw extruder extruding pelletization, make the second particulate material;
Step 3: the first particulate material in step 2 is mixed and formed compound by 1:3 with the second particulate material, then through this compound being passed through to extrusion mechanism film forming after the dry processing of drying machine;
Step 4: simple tension pore-creating;
Step 5: thermal finalization;
Step 6: rolling.
Reinforcing material in described step 1 is ultra-high molecular weight polyethylene.
In described step 3, extrusion temperature is 210 degrees Celsius during by extruder.
Temperature in described step 4 during simple tension pore-creating is 120 degrees Celsius, and rate of extension is 30 ms/min, and extensibility is 220%.
In described step 5, the time of thermal finalization is 300 minutes, and temperature is 120 degrees Celsius.
embodiment 5:the production method of lithium battery diaphragm is manufactured in dry method simple tension, carries out in accordance with the following steps:
Step 1: select polypropylene (PP), low density polyethylene (LDPE) (LDPE), sorbierite (C6H14O6), grease and reinforcing material as raw material;
Step 2: after the grease that the reinforcing material that the sorbierite that the polypropylene that is 90% by mass percent (PP), mass percent are 1%, mass percent are 2%, mass percent are 7% combines by batch mixer, pass through again the dry processing of drying machine, by double screw extruder extruding pelletization, make the first particulate material; After the reinforcing material that the low density polyethylene (LDPE) that is 95% by mass percent (LDPE), mass percent are 5% combines by batch mixer, then pass through the dry processing of drying machine, by double screw extruder extruding pelletization, make the second particulate material;
Step 3: the first particulate material in step 2 is mixed and formed compound by 1:2 with the second particulate material, then through this compound being passed through to extrusion mechanism film forming after the dry processing of drying machine;
Step 4: simple tension pore-creating;
Step 5: thermal finalization;
Step 6: rolling.
Reinforcing material in described step 1 is ultra-high molecular weight polyethylene.
In described step 3, extrusion temperature is 190 degrees Celsius during by extruder.
Temperature in described step 4 during simple tension pore-creating is 110 degrees Celsius, and rate of extension is 50 ms/min, and extensibility is 220%.
In described step 5, the time of thermal finalization is 500 minutes, and temperature is 110 degrees Celsius.
The thickness of making metacneme is about 25 microns, and porosity is at 37-48%, and gas permeability is at 350-400
Within 90 degrees Celsius, two hours, thermal contraction, for being longitudinally less than 5%, is laterally less than 0.5%, and all adjustable.
embodiment 6:the production method of lithium battery diaphragm is manufactured in this dry method simple tension, carries out in accordance with the following steps: step 1: select polypropylene (PP), low density polyethylene (LDPE) (LDPE), sorbierite (C6H14O6), grease and reinforcing material as raw material;
Step 2: after the grease that the reinforcing material that the sorbierite that the polypropylene that is 93% by mass percent (PP), mass percent are 0.1%, mass percent are 0.1%, mass percent are 6.8% combines by batch mixer, pass through again the dry processing of drying machine, by double screw extruder extruding pelletization, make the first particulate material; After the reinforcing material that the low density polyethylene (LDPE) that is 96% by mass percent (LDPE), mass percent are 4% combines by batch mixer, then pass through the dry processing of drying machine, by double screw extruder extruding pelletization, make the second particulate material;
Step 3: the first particulate material in step 2 is mixed and formed compound by 1:2.5 with the second particulate material, then through this compound being passed through to extrusion mechanism film forming after the dry processing of drying machine;
Step 4: simple tension pore-creating;
Step 5: thermal finalization;
Step 6: rolling.
Reinforcing material in described step 1 is ultra-high molecular weight polyethylene.
In described step 3, extrusion temperature is 220 degrees Celsius during by extruder.
Temperature in described step 4 during simple tension pore-creating is 130 degrees Celsius, and rate of extension is 60 ms/min, and extensibility is 220%.
In described step 5, the time of thermal finalization is 600 minutes, and temperature is 130 degrees Celsius.
Although the present invention is set forth with reference to preferred embodiment, it should be appreciated by those skilled in the art that and can carry out different modifications and distortion and not depart from the scope of the present invention for the present invention.
Claims (5)
1. a production method for lithium battery diaphragm is manufactured in dry method simple tension, carries out in accordance with the following steps:
Step 1: select polypropylene (PP), low density polyethylene (LDPE) (LDPE), sorbierite (C6H14O6), grease and reinforcing material as raw material;
Step 2: after the grease that the reinforcing material that the sorbierite that the polypropylene that is 75-93% by mass percent (PP), mass percent are 0.1-8%, mass percent are 0.1-6%, mass percent are 5-16% combines by batch mixer, through super-dry, process again, by double screw extruder extruding pelletization, make the first particulate material; After the reinforcing material that the low density polyethylene (LDPE) that is 89-96% by mass percent (LDPE), mass percent are 1-12% combines by batch mixer, then process through super-dry, by double screw extruder extruding pelletization, make the second particulate material;
Step 3: the first particulate material in step 2 is mixed and formed compound to 1:2 by 1:3 with the second particulate material, then after super-dry is processed, this compound is passed through to extrusion mechanism film forming;
Step 4: simple tension pore-creating;
Step 5: thermal finalization;
Step 6: rolling.
2. the production method of lithium battery diaphragm is manufactured in dry method simple tension according to claim 1, it is characterized in that: the reinforcing material in described step 1 is ultra-high molecular weight polyethylene.
3. the production method of lithium battery diaphragm is manufactured in dry method simple tension according to claim 1, it is characterized in that: in described step 3, extrusion temperature is 160-220 degree Celsius during by extruder.
4. the production method of lithium battery diaphragm is manufactured in dry method simple tension according to claim 1, it is characterized in that: the temperature in described step 4 during simple tension pore-creating is 90-130 degree Celsius, and rate of extension is 20-60 m/min, and extensibility is 220%.
5. the production method of lithium battery diaphragm is manufactured in dry method simple tension according to claim 1, it is characterized in that: in described step 5, the time of thermal finalization is 200-600 minute, and temperature is 90-130 degree Celsius.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310147135.6A CN104124412A (en) | 2013-04-25 | 2013-04-25 | Dry unidirectional stretching method for manufacturing lithium battery diaphragm |
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| CN201310147135.6A CN104124412A (en) | 2013-04-25 | 2013-04-25 | Dry unidirectional stretching method for manufacturing lithium battery diaphragm |
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| CN101280085A (en) * | 2008-05-23 | 2008-10-08 | 佛山塑料集团股份有限公司 | Preparation of porous film material |
| CN101469086A (en) * | 2007-12-29 | 2009-07-01 | 上海润龙包装用品有限公司 | Polyethylene membrane |
| CN101885869A (en) * | 2009-05-15 | 2010-11-17 | 金伯利-克拉克环球有限公司 | Flexible thermoplastic film and product thereof |
| CN102627796A (en) * | 2012-04-11 | 2012-08-08 | 中国科学院化学研究所 | Polyethylene composition for manufacturing lithium battery diaphragm |
-
2013
- 2013-04-25 CN CN201310147135.6A patent/CN104124412A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3926679A (en) * | 1974-01-09 | 1975-12-16 | Monsanto Co | Phenolic resin and battery separator impregnated therewith |
| CN1640922A (en) * | 2004-01-08 | 2005-07-20 | 上海紫泉标签有限公司 | High-transparency polytene thermocontracted film and producing method thereof |
| CN1613907A (en) * | 2004-09-24 | 2005-05-11 | 清华大学 | Microporous polypropylene membrane and its preparation |
| CN101469086A (en) * | 2007-12-29 | 2009-07-01 | 上海润龙包装用品有限公司 | Polyethylene membrane |
| CN101280085A (en) * | 2008-05-23 | 2008-10-08 | 佛山塑料集团股份有限公司 | Preparation of porous film material |
| CN101885869A (en) * | 2009-05-15 | 2010-11-17 | 金伯利-克拉克环球有限公司 | Flexible thermoplastic film and product thereof |
| CN102627796A (en) * | 2012-04-11 | 2012-08-08 | 中国科学院化学研究所 | Polyethylene composition for manufacturing lithium battery diaphragm |
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Application publication date: 20141029 |