CN108466415B - Wet diaphragm membrane preparation device and preparation method - Google Patents
Wet diaphragm membrane preparation device and preparation method Download PDFInfo
- Publication number
- CN108466415B CN108466415B CN201810419830.6A CN201810419830A CN108466415B CN 108466415 B CN108466415 B CN 108466415B CN 201810419830 A CN201810419830 A CN 201810419830A CN 108466415 B CN108466415 B CN 108466415B
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- adjusting
- diaphragm
- temperature
- thickness
- membrane
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- 239000012528 membrane Substances 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 26
- 238000001816 cooling Methods 0.000 claims abstract description 17
- 238000001125 extrusion Methods 0.000 claims abstract description 10
- 229920000642 polymer Polymers 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims description 29
- 230000001105 regulatory effect Effects 0.000 claims description 10
- 238000000465 moulding Methods 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 claims description 5
- 238000007493 shaping process Methods 0.000 claims 2
- 239000000463 material Substances 0.000 abstract description 4
- 239000002699 waste material Substances 0.000 abstract description 4
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005191 phase separation Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 239000005662 Paraffin oil Substances 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 239000004699 Ultra-high molecular weight polyethylene Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000008240 homogeneous mixture Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000013557 residual solvent Substances 0.000 description 1
- 229920000785 ultra high molecular weight polyethylene Polymers 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- 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
-
- 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
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/411—Organic material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92609—Dimensions
- B29C2948/92647—Thickness
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92942—Moulded article
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a wet diaphragm membrane preparation device, which comprises an extrusion structure for extruding a polymer melt and a cooling forming structure for forming a diaphragm membrane; the thickness control structure is arranged close to the cooling forming structure and used for adjusting and controlling the thickness of the film sheet during forming so as to obtain the film sheet with the thick middle and the thin periphery; the thickness of the diaphragm is adjusted through the thickness control structure in the diaphragm forming process, so that a diaphragm with a thick middle and a thin periphery is obtained, and then the diaphragm can be stretched to obtain a diaphragm with uniform thickness; therefore, the uniformity of the stretching stage of the membrane is improved, the utilization rate of the membrane is improved, and the waste of materials is avoided as much as possible.
Description
Technical Field
The invention relates to the technical field of porous membrane preparation, in particular to a wet method diaphragm membrane preparation device and a preparation method.
Background
At present, the preparation method of the lithium ion battery diaphragm is divided into a dry method and a wet method; the wet process is also called phase separation process or thermal phase separation process, which includes mixing liquid hydrocarbon or some small molecular matters with polyolefin resin, heating to melt to form homogeneous mixture, cooling to separate phase, pressing to obtain film, heating the film to near the smelting point, bi-directional stretching to orient molecular chain, maintaining the temperature for some time, and eluting residual solvent with volatile matter to prepare microporous film material.
Wet process membranes generally use ultra-high molecular weight polyethylene as the membrane body, paraffin oil as the pore former, and methylene chloride as the extract. In the stretching stage of the preparation process of the diaphragm, the diaphragm after casting is required to be subjected to one-time longitudinal stretching and two-time transverse stretching, and in order to obtain the diaphragm with good consistency, a large number of parts with uneven thickness are cut off after the stretching process, so that very serious waste is caused, and the actual utilization rate of the diaphragm is generally only 40% -60%. Therefore, how to improve the uniformity of the membrane during the stretching stage is a key to improving the production efficiency of the membrane.
In summary, a wet process diaphragm preparation device and a preparation method capable of improving uniformity in a stretching stage are provided.
Disclosure of Invention
To this end, the invention provides a wet process diaphragm membrane preparation device comprising an extrusion structure for extruding a polymer melt, and a cooling forming structure for forming a diaphragm membrane; the cooling forming structure is arranged close to the cooling forming structure, and the thickness control structure is used for adjusting and controlling the thickness of the film during forming to obtain the film with the thick middle and the thin periphery.
The cooling forming structure comprises a leaning roller and a forming roller, and the thickness control structure comprises an adjusting die which is close to the forming roller and a temperature adjusting component which is used for adjusting and controlling the temperature of the adjusting die, wherein the adjusting die is contacted with the adjusting surface of the membrane to form a concave structure with concave middle and two protruding ends.
The temperature adjusting component comprises a plurality of heating elements which are uniformly distributed below the adjusting surface of the adjusting die, and the heating elements enable the adjusting surface to form a plurality of heating sections with independent temperature control.
The number of the heating sections is set to be 5-15, and the temperature control range of the heating sections is 60-250 degrees.
The heating interval is also internally provided with a temperature sensor and a PLC controller for adjusting the temperature of the heating element in the heating interval according to the detection temperature of the temperature sensor.
The thickness control structure further includes a pressure regulating structure.
The pressure adjusting structure comprises a plurality of screw structures which are uniformly distributed below the adjusting die, and the screw end parts of the screw structures are propped against the bottom surface of the adjusting die.
The pressure of the pressure regulating structure ranges from 700Kgf to 2500Kgf.
On the basis of the above, the invention further provides a preparation method of the wet diaphragm membrane, which comprises the following steps: the polymer solution extruded by the extrusion die head of the extrusion structure is molded in the cooling molding structure, and in the molding process, the thickness control structure adjusts the thickness of the molded membrane.
The temperature adjusting component of the thickness control structure is used for carrying out regional adjustment on the temperature of the formed diaphragm, and the pressure adjusting structure of the thickness control structure is used for carrying out fine adjustment on the whole thickness of the diaphragm.
Compared with the prior art, the invention has the following advantages:
in the invention, the thickness of the diaphragm is regulated by the thickness control structure in the diaphragm forming process, so that the diaphragm with the thick periphery in the middle is obtained, and the diaphragm with uniform thickness can be obtained after the diaphragm is stretched; therefore, the uniformity of the stretching stage of the membrane is improved, the utilization rate of the membrane is improved, and the waste of materials is avoided as much as possible.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a wet process diaphragm membrane preparation apparatus according to the present invention;
FIG. 2 is another schematic view of a wet process diaphragm membrane preparation apparatus according to the present invention;
FIG. 3 is a schematic cross-sectional view of a wet process diaphragm membrane preparation apparatus according to the present invention;
reference numerals illustrate: 1-a membrane; 2-leaning roller; 3-forming rollers; 4-adjusting the die; 5-a heating element; 6-pressure regulating structure.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Example 1
As shown in fig. 1, 2 and 3, the present embodiment provides a wet process diaphragm sheet manufacturing apparatus including an extrusion structure for extruding a polymer melt, and a cooling forming structure for forming a diaphragm sheet 1; it also comprises a thickness control structure which is arranged close to the cooling forming structure and used for adjusting and controlling the thickness of the film 1 during forming so as to obtain the film 1 with a thick middle periphery.
In this embodiment, the thickness of the membrane 1 is adjusted by the thickness control structure in the forming process of the membrane 1, so as to obtain a membrane 1 with a thin periphery and a thick middle, and then the membrane 1 can obtain a membrane with uniform thickness after being stretched; thus, the uniformity of the stretching stage of the membrane 1 is improved, the utilization rate of the membrane 1 is improved, and the waste of materials is avoided as much as possible.
Specifically, the cooling forming structure comprises a leaning roller 2 and a forming roller 3, and the thickness control structure comprises an adjusting die 4 arranged close to the forming roller 3 and a temperature adjusting component for performing temperature adjusting control on the adjusting die 4, wherein the adjusting die 4 contacts with the adjusting surface of the membrane 1 to form a concave structure with concave middle and two protruding ends.
Further, the temperature adjusting component comprises a plurality of heating elements 5 which are uniformly distributed below the adjusting surface of the adjusting die 4, and the heating elements 5 enable the adjusting surface to form a plurality of heating sections with independent temperature control. The number of the heating sections is set to be 5-15, and the temperature control range of the heating sections is 60-250 degrees. As a preferable implementation mode, the temperature control range is 150-250 ℃; therefore, the formed diaphragm 1 has a plurality of different thicknesses, so that the diaphragm can fully meet the deformation requirement of the stretching stage, and the thickness uniformity of the diaphragm after the stretching treatment is ensured to the greatest extent.
As a preferred embodiment, a temperature sensor and a PLC controller for adjusting the temperature of the heating element 5 in the heating section according to the detected temperature of the temperature sensor are further provided in the heating section of the present embodiment; thereby the heating temperature in the heating section can be adjusted in time.
The thickness control structure further comprises a pressure regulating structure 6.
The pressure regulating structure 6 comprises a plurality of screw structures which are uniformly distributed below the regulating die 4, wherein the screw ends of the screw structures are propped against the bottom surface of the regulating die 4, and the pressure range of the pressure regulating structure 6 is 700 Kgf-2500 Kgf; the screw structure can be used for carrying out integral fine adjustment or regional fine adjustment on the distance between the adjusting surface of the adjusting die 4 and the forming roller 3, so that the forming thickness of the membrane 1 is adjusted.
Example 2
On the basis of the above, the invention further provides a preparation method of the wet diaphragm membrane, which comprises the following steps: the polymer solution extruded from the extrusion die head of the extrusion structure is molded in a cooling molding structure, and in the molding process, the thickness control structure adjusts the thickness of the molded film 1.
The temperature adjusting component of the thickness control structure carries out regional adjustment on the temperature of the formed diaphragm 1, and the pressure adjusting structure 6 of the thickness control structure carries out fine adjustment on the whole thickness of the diaphragm 1.
In this embodiment, the heating element 5 in the temperature adjusting component disposed in the area is used to realize regional adjustment of the forming thickness of the diaphragm 1, and the pressure adjusting structure 6 is used to integrally adjust or regionally adjust the forming thickness of the diaphragm 1, so that the formed diaphragm 1 has a plurality of different thicknesses, so that the deformation requirement of the stretching stage can be fully satisfied, and the thickness uniformity of the diaphragm after the stretching treatment is ensured to the greatest extent.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (4)
1. Wet process diaphragm membrane preparation facilities, it includes the extrusion structure that is used for extruding polymer melt, is used for the cooling shaping structure of shaping diaphragm (1), its characterized in that: the cooling forming structure is arranged close to the cooling forming structure, and the thickness control structure is used for adjusting and controlling the thickness of the film (1) during forming to obtain the film (1) with the thick middle and the thin periphery; the cooling forming structure comprises a leaning roller (2) and a forming roller (3), and the thickness control structure comprises an adjusting die (4) arranged close to the forming roller (3) and a temperature adjusting component for adjusting and controlling the temperature of the adjusting die (4), wherein the adjusting die (4) contacts with the adjusting surface of the membrane (1) to form a concave structure with concave middle and two protruding ends; the temperature adjusting component comprises a plurality of heating elements (5) which are uniformly distributed below the adjusting surface of the adjusting die (4), and the heating elements (5) enable the adjusting surface to form a plurality of heating sections with independent temperature control; the thickness control structure further comprises a pressure regulating structure (6); the pressure adjusting structure (6) comprises a plurality of screw structures which are uniformly distributed below the adjusting die (4), and the screw ends of the screw structures are propped against the bottom surface of the adjusting die (4).
2. The wet process diaphragm membrane preparation apparatus according to claim 1, wherein: the number of the heating sections is set to 5-15.
3. The wet process diaphragm membrane preparation apparatus according to claim 1, wherein: the heating section is also internally provided with a temperature sensor and a PLC controller for adjusting the temperature of the heating element (5) in the heating section according to the detected temperature of the temperature sensor.
4. A method for preparing a wet process diaphragm membrane using the wet process diaphragm membrane preparation apparatus as claimed in any one of claims 1 to 3, characterized in that: the polymer solution extruded by the extrusion die head of the extrusion structure is molded in a cooling molding structure, and in the molding process, the thickness control structure adjusts the thickness of the molded membrane (1); the temperature adjusting component of the thickness control structure is used for carrying out regional adjustment on the temperature of the formed diaphragm (1), and the pressure adjusting structure (6) of the thickness control structure is used for carrying out fine adjustment on the whole thickness of the diaphragm (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810419830.6A CN108466415B (en) | 2018-05-04 | 2018-05-04 | Wet diaphragm membrane preparation device and preparation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810419830.6A CN108466415B (en) | 2018-05-04 | 2018-05-04 | Wet diaphragm membrane preparation device and preparation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108466415A CN108466415A (en) | 2018-08-31 |
| CN108466415B true CN108466415B (en) | 2023-11-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810419830.6A Active CN108466415B (en) | 2018-05-04 | 2018-05-04 | Wet diaphragm membrane preparation device and preparation method |
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| Country | Link |
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| CN (1) | CN108466415B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112987815A (en) * | 2021-02-22 | 2021-06-18 | 浙江野马电池股份有限公司 | Paper ironing temperature control device and control method for diaphragm machine |
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| WO2008123559A1 (en) * | 2007-03-30 | 2008-10-16 | Fujifilm Corporation | Method and apparatus for manufacturing uneven thickness resin sheet |
| CN102205639A (en) * | 2011-03-03 | 2011-10-05 | 北京化工大学 | Method for polymer extruding and micro embossing shaping |
| CN202123668U (en) * | 2011-07-20 | 2012-01-25 | 蒋怀阳 | EVA (Ethylene Vinyl Acetate) membrane production unit |
| CN104589629A (en) * | 2014-11-29 | 2015-05-06 | 东电化日东（上海）电能源有限公司 | Method and extrusion die head for disturbing thickness distribution of extruded thin film casting sheet |
| CN106299196A (en) * | 2015-06-23 | 2017-01-04 | 辽源鸿图锂电隔膜科技股份有限公司 | The cooling roller device of three kinds of microcellular structure lithium ion battery separators of preparation |
| CN206690428U (en) * | 2017-05-02 | 2017-12-01 | 东莞市华岳导热科技有限公司 | One kind calendering overlay film forming integrated machine |
| CN208615265U (en) * | 2018-05-04 | 2019-03-19 | 湖南烁普新材料有限公司 | Wet process diaphragm membrane preparation facilities |
-
2018
- 2018-05-04 CN CN201810419830.6A patent/CN108466415B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008123559A1 (en) * | 2007-03-30 | 2008-10-16 | Fujifilm Corporation | Method and apparatus for manufacturing uneven thickness resin sheet |
| CN102205639A (en) * | 2011-03-03 | 2011-10-05 | 北京化工大学 | Method for polymer extruding and micro embossing shaping |
| CN202123668U (en) * | 2011-07-20 | 2012-01-25 | 蒋怀阳 | EVA (Ethylene Vinyl Acetate) membrane production unit |
| CN104589629A (en) * | 2014-11-29 | 2015-05-06 | 东电化日东（上海）电能源有限公司 | Method and extrusion die head for disturbing thickness distribution of extruded thin film casting sheet |
| CN106299196A (en) * | 2015-06-23 | 2017-01-04 | 辽源鸿图锂电隔膜科技股份有限公司 | The cooling roller device of three kinds of microcellular structure lithium ion battery separators of preparation |
| CN206690428U (en) * | 2017-05-02 | 2017-12-01 | 东莞市华岳导热科技有限公司 | One kind calendering overlay film forming integrated machine |
| CN208615265U (en) * | 2018-05-04 | 2019-03-19 | 湖南烁普新材料有限公司 | Wet process diaphragm membrane preparation facilities |
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| Publication number | Publication date |
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| CN108466415A (en) | 2018-08-31 |
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