CN116749627A - Composite release film for lithium ion battery processing, processing technology and application - Google Patents
Composite release film for lithium ion battery processing, processing technology and application Download PDFInfo
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- CN116749627A CN116749627A CN202310740630.1A CN202310740630A CN116749627A CN 116749627 A CN116749627 A CN 116749627A CN 202310740630 A CN202310740630 A CN 202310740630A CN 116749627 A CN116749627 A CN 116749627A
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- main body
- composite
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- 239000002131 composite material Substances 0.000 title claims abstract description 33
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 20
- 238000005516 engineering process Methods 0.000 title claims description 8
- 238000000576 coating method Methods 0.000 claims abstract description 56
- 239000011248 coating agent Substances 0.000 claims abstract description 54
- 238000005096 rolling process Methods 0.000 claims abstract description 51
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 46
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 46
- 230000001681 protective effect Effects 0.000 claims abstract description 43
- 229920002545 silicone oil Polymers 0.000 claims abstract description 31
- 239000011888 foil Substances 0.000 claims abstract description 28
- 239000003795 chemical substances by application Substances 0.000 claims description 58
- 239000002904 solvent Substances 0.000 claims description 14
- 238000004804 winding Methods 0.000 claims description 14
- 238000004873 anchoring Methods 0.000 claims description 8
- 239000003054 catalyst Substances 0.000 claims description 8
- 239000003431 cross linking reagent Substances 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 7
- 239000000853 adhesive Substances 0.000 claims description 6
- 230000001070 adhesive effect Effects 0.000 claims description 6
- 230000007246 mechanism Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 238000013329 compounding Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 229920002799 BoPET Polymers 0.000 claims description 4
- 239000000654 additive Substances 0.000 claims description 4
- 230000000996 additive effect Effects 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 4
- 239000012752 auxiliary agent Substances 0.000 claims description 3
- 230000007547 defect Effects 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 abstract description 4
- 239000010703 silicon Substances 0.000 abstract description 4
- 238000003825 pressing Methods 0.000 abstract description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 24
- 229920000139 polyethylene terephthalate Polymers 0.000 description 15
- 239000012528 membrane Substances 0.000 description 8
- 239000000203 mixture Substances 0.000 description 8
- 239000003921 oil Substances 0.000 description 8
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 6
- 229920001296 polysiloxane Polymers 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 150000003058 platinum compounds Chemical class 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 229920005573 silicon-containing polymer Polymers 0.000 description 2
- 229920002050 silicone resin Polymers 0.000 description 2
- 238000003475 lamination Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- 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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- Laminated Bodies (AREA)
Abstract
The invention discloses a composite release film combination for lithium ion battery processing, which has the technical scheme that: the release film comprises a release A film and a release B film, wherein the release A film and the release B film comprise a film main body, a release layer and a protective film, the two surfaces of the film main body are respectively a coating surface and a non-coating surface, the release layer is attached to the coating surface of the film main body, and the protective film can be separately compounded on the non-coating surface of the film main body; based on the scheme, the composite release film is applied to rolling an ultrathin lithium foil belt, a protective film is compounded on the non-coating surface of the release film, silicone oil on the coating surface is transferred to the surface of the protective film to replace the non-coating surface during rolling, and the protective film is firstly stripped and then enters a roller for rolling during rolling the ultrathin lithium foil belt, so that the problem of relative sliding between the film and a pressing roller caused by transferring silicon to the non-coating surface is effectively avoided.
Description
Technical Field
The invention relates to the technical field of lithium ion battery processing, in particular to a composite release film for lithium ion battery processing, a processing technology and application.
Background
The ultrathin lithium foil strip can be used as a battery cathode to greatly improve the energy density of the battery. At present, the technology of pressing the lithium foil belt into an ultrathin lithium foil belt by a rolling mode for a solid-state battery cathode is receiving more and more attention because the battery performance can be greatly improved.
In the process of rolling a lithium foil strip into an ultrathin lithium foil strip, a mode of protecting and bearing the lithium foil strip by adopting a release film combination is widely applied. Because the release film has the silicon transfer problem, namely, the silicone oil on the coating surface of the release film can be partially transferred to the non-coating surface during rolling, and the non-coating surface can cause the relative sliding problem of the press roller and the release film when being contacted with the press roller due to the existence of the silicone oil during rolling of the lithium foil. The relative sliding of the press roller and the release film can lead the lithium belt to be wrinkled and deformed, and the production stability is greatly affected.
Disclosure of Invention
The invention aims to solve the problems in the background art, provides a composite release film combination for processing a lithium ion battery, and discloses a processing technology of the composite release film for processing the lithium ion battery. And when the ultrathin lithium foil strip is rolled, the protective film is firstly peeled off and then enters a roller for rolling, so that the problem of relative sliding between the film and the roller caused by the transfer of silicon to the non-coating surface is effectively avoided.
In order to achieve the above object, the present invention adopts the following technical scheme:
a compound release film combination for lithium ion battery processing, includes from type A membrane and from type B membrane, from type A membrane and from type B membrane all contain the membrane main part, from type layer and protection film, the membrane main part both sides are coating surface and non-coating surface respectively, from type layer adhesion at the coating surface of membrane main part, the detachable complex of protection film is at the non-coating surface of membrane main part.
Further, parameters of release agents of the release A film and the release B film are designed as follows:
and (3) separating a film: the release force of the release layer is 4-6g/in, the residual adhesive rate is 60-80%, and the dry coating weight of the release agent is 0.4-0.6g/m 2 ；
And (3) separating a B film: the release force of the release layer is 3-5g/in, the residual adhesive rate is 80-100%, and the dry coating weight of the release agent is 0.8-1.2g/m 2 。
Further, the protective film is a PE film, and the PE film is attached and fixed on the non-coated surface of the film main body through a second unreeling system.
The invention discloses a processing technology of a composite release film for processing a lithium ion battery, which comprises the following steps:
1) Preparing a parting agent;
2) First unreeling: selecting a PET film as a film main body, and unreeling the PET film placed on the winding drum;
3) Coating: coating the release agent prepared in the step 1) on one surface of the unreeled film main body;
4) And (3) drying: drying and curing the release agent coated on the surface of the film main body by using an oven;
5) And (3) second unreeling: selecting a PE film as a protective film, and unreeling the PE film placed on the winding drum;
6) Compounding: compounding the film main body discharged from the oven with the unreeled PE film, wherein the PE film is attached to the non-coating surface of the film main body;
7) And (3) cooling: the composite film is prepared by cooling the composite film main body and the PE film;
8) And (3) rolling: and rolling the cooled composite film.
Further, two kinds of release agents with a proportion are respectively coated on the film main body to respectively prepare a release A film and a release B film,
the release agent adopted for the release A film (1 a) comprises a silicone oil system and a solvent, wherein the silicone oil system comprises 1000 parts of a silicone oil main agent, 15-25 parts of a cross-linking agent, 5-15 parts of an anchoring agent, 15-30 parts of a catalyst and 15-25 parts of a stripping force additive;
the release agent adopted for the release film B (1B) comprises 1000 parts of silicone oil system and 15-25 parts of cross-linking agent, 5-15 parts of anchoring agent, 15-30 parts of catalyst and 5-15 parts of anti-sticking auxiliary agent, wherein the silicone oil system comprises 1000 parts of silicone oil main agent and solvent.
Further, two kinds of release agents with a proportion are respectively coated on the film main body to respectively prepare a release A film and a release B film,
for the release agent adopted by the release A film, the release force is 4-6g/in after 20min, the residual adhesion rate is 60-80%, and the dry coating weight of the release agent is 0.4-0.6g/m 2 ；
For the release agent adopted by the release B film, the release force is 3-5g/in after 20min, the residual adhesion rate is 80-100%, and the dry coating weight of the release agent is 0.8-1.2g/m 2 。
The invention also discloses application of the composite release film combination for processing the lithium ion battery on rolling an ultrathin lithium foil belt, which comprises the following specific contents:
the raw material used for rolling the ultrathin lithium foil strip is a thick lithium strip; the adopted apparatus comprises a same-speed rolling device and a protective film separating device, wherein the same-speed rolling device comprises at least one group of press roller mechanisms, each press roller mechanism comprises two rollers with the same speed but opposite rotation directions, and a rolling channel is formed between the two rollers; the specific application mode of the composite release film combination on the rolled ultrathin lithium foil tape is as follows: the release A film, the release B film and the thick lithium belt pass through a rolling channel of a same-speed rolling device together for rolling and thinning, the thick lithium belt is clamped between the release A film and the release B film, the coating surface of the release A film faces one surface of the thick lithium belt, the coating surface of the release B film faces the other surface of the thick lithium belt, the release A film and the release B film are peeled off the protective film through a protective film separating device before entering the same-speed rolling device, and an ultrathin lithium foil belt with the release A film and the release B film, the two surfaces of which are respectively provided with the protective film, is manufactured behind the same-speed rolling device;
for the release A film/release B film in a rolling state, the coated surface and the non-coated surface are isolated by the protective film, and silicone oil on the coated surface is transferred to the surface of the protective film to replace the silicone oil on the coated surface and the non-coated surface; when the ultrathin lithium foil is rolled, the non-coating surfaces of the release A film and the release B film are respectively contacted with the rollers at two sides of the rolling channel, so that the defect that the non-coating surfaces and the rollers slide relatively due to the fact that silicone oil is attached to the non-coating surfaces is overcome.
Drawings
FIG. 1 is a schematic diagram of a release A film/release B film according to an embodiment of the present invention.
Fig. 2 is a process flow diagram of a composite release film assembly in an embodiment of the invention.
Fig. 3 is a schematic application diagram of a composite release film assembly according to an embodiment of the present invention.
Reference numerals: 1a, releasing the film A; 1B, releasing a B film; 10. a PET transparent film; 11. a release layer; 12. a PE protective film; 2. a thick lithium strip; 20. an ultrathin lithium foil strip; 3. a same-speed rolling device; 30. a roller; 4. and (5) winding the winding drum.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The composite release film combination for processing the lithium ion battery shown in fig. 1 comprises a release film A1 a and a release film B1B, wherein the release film A1 a and the release film B1B respectively comprise a film main body, a release layer 11 and a protective film, the film main body is a PET transparent film 10, the protective film is a PE protective film 12, two sides of the PET transparent film 10 are respectively a coated surface and a non-coated surface, the release layer 11 is attached to the coated surface of the PET transparent film 10, and the PE protective film 12 can be separately compounded on the non-coated surface of the PET transparent film 10. The release A film 1a and the release B film 1B are distinguished by coating release agents with different proportions.
For the release layer 11 of the release A film 1a, an organic silicon release agent is adopted, and the silicone oil system ratio of the release agent is as follows: 1000 parts of silicone oil main agent, 20 parts of cross-linking agent and 8 parts of anchoring agent22 parts of catalyst and 30 parts of release force additive, wherein the silicone oil main agent adopts reactive siloxane polymer (Dow company, 9106), the cross-linking agent adopts SiH functional siloxane (Dow company, 7028), the anchoring agent adopts composite organic functional siloxane (Dow company, 9176), the catalyst adopts organic platinum compound (Dow company, 4000), and the release force additive adopts silicone resin solution (Dow company, 7200); the parting agent adopts a mixture of ethyl acetate and 120# solvent oil, and the proportion of the mixture is ethyl acetate: 120# solvent oil=7:3. The release layer 11 of the release A film 1a had a release force of 4.2g/in for 20min, a residual adhesion (SA) of 70% and a dry coating weight of 0.55/m 2 。
Specific parameters of release layer 11 of release a film 1a are shown in table 1 below:
TABLE 1
For the release layer 11 of the release film B1B, an organosilicon release agent is adopted, and the silicone oil system ratio of the release agent is as follows: 1000 parts of silicone oil main agent, 21 parts of cross-linking agent, 8 parts of anchoring agent, 24 parts of catalyst and 9 parts of anti-sticking auxiliary agent, wherein the silicone oil main agent adopts reactive siloxane polymer (Dow company, 9106), the cross-linking agent adopts SiH functional siloxane (Dow company, 7028), the anchoring agent adopts composite organic functional siloxane (Dow company, 9176), and the catalyst adopts organic platinum compound (Dow company, 4000); the parting agent adopts a mixture of ethyl acetate and 120# solvent oil, and the proportion of the mixture is ethyl acetate: 120# solvent oil=7:3. Release force of 20min of release layer 11 of release film B1B was 4.5g/in, residual adhesion (SA) was 99%, and dry coating weight was 0.88/m 2 。
Parameters of the release agent used for release film B1B are as follows table 2:
TABLE 2
As shown in fig. 2, the processing technology of the composite release film for processing the lithium ion battery can be used for processing the release a film 1a and the release B film 1B, and specifically comprises the following steps:
1) Preparing a parting agent:
for processing release a film 1a, the silicone oil system of the release agent was formulated as a mixture of 1000 parts of reactive silicone polymer (dow company, 9106), 20 parts of SiH functional silicone (dow company, 7028), 8 parts of complex organofunctional silicone (dow company, 9176), 22 parts of organoplatinum compound (dow company, 4000) and 30 parts of silicone resin solution (dow company, 7200), the solvent was a mixture of ethyl acetate and 120# solvent oil, the ratio was ethyl acetate: no. 120 solvent oil=7:3;
for processing release film B1B, the silicone oil system of the release agent was formulated as a mixture of 1000 parts of reactive silicone polymer (dow company, 9106), 21 parts of SiH functional silicone (dow company, 7028), 8 parts of complex organofunctional silicone (dow company, 9176), 24 parts of organoplatinum compound (dow company, 4000) and 9 parts of release aid, the solvent being a mixture of ethyl acetate and 120# solvent oil, the ratio being ethyl acetate: no. 120 solvent oil=7:3;
2) First unreeling: selecting a PET transparent film 10 as a film main body, and unreeling the PET transparent film 10 placed on a reel;
3) Coating:
coating the release agent for processing the release A film 1a, which is prepared in the step 1), on the coating surface of the unreeled PET transparent film 10 by adopting a micro-concave reverse coating method, wherein the release force is 4.2g/in for 20min, the residual adhesive rate (SA) is 70%, and the dry coating amount of the release agent is 0.55g/m 2 ；
Coating the release agent for processing the release B film 1B, which is prepared in the step 1), on the coating surface of the unreeled PET transparent film 10 by adopting a micro-concave reverse coating method, wherein the release force is 4.5g/in for 20min, the residual adhesive rate (SA) is 99%, and the dry coating amount of the release agent is 0.88g/m 2 ；
4) And (3) drying: drying and curing the release agent coated on the surface of the PET transparent film 10 by using an oven, wherein the temperature of the oven is 80-150 ℃ and the drying time is 30 seconds in 8 areas;
5) And (3) second unreeling: selecting a PE film as a protective film, and unreeling the PE film placed on the winding drum;
6) Compounding: the PET transparent film 10 which is discharged from the oven is compounded with the unreeled PE film in a pressing roll lamination mode, and the PE film is attached to the non-coating surface of the PET transparent film 10;
7) And (3) cooling: the PET transparent film 10 and the PE film after being compounded are manufactured into a composite film (comprising a release A film 1a and a release B film 1B) after being cooled;
8) And (3) rolling: the cooled release a film 1a and release B film 1B are wound up respectively.
As shown in fig. 3, the application of the composite release film combination for lithium ion battery processing to rolling ultrathin lithium foil strips 20 specifically includes:
the raw materials used for rolling the ultrathin lithium foil strip 20 are thick lithium strips 2, and the release A film 1a and the release B film 1B are required to be fixed on the two surfaces of the ultrathin lithium foil strip 20 through rolling respectively so as to protect and bear the ultrathin lithium foil strip 20; the adopted apparatus comprises a same-speed rolling device 3 and a protective film separating device, wherein the same-speed rolling device 3 comprises a group of press roller mechanisms, the press roller mechanisms comprise two rollers 30 with the same speed but opposite rotation directions, a rolling channel is formed between the two rollers 30, the protective film separating device comprises two winding drums 4, and the winding drums 4 are driven to rotate by a motor.
The specific application mode of the composite release film combination on the rolled ultrathin lithium foil strip 20 is as follows:
the release A film 1a, the release B film 1B and the thick lithium strip 2 pass through a rolling channel of the same-speed rolling device 3 together for rolling and thinning, the thick lithium strip 2 is clamped between the release A film 1a and the release B film 1B, the coating surface of the release A film 1a faces one surface of the thick lithium strip 2, and the coating surface of the release B film 1B faces the other surface of the thick lithium strip 2; the two winding drums 4 are respectively and correspondingly arranged at the sides of the release A film 1a and the release B film 1B, the release A film 1a and the release B film 1B respectively pass through the winding drums 4 before entering the same-speed rolling device 3, the PE protective film 12 on the release A film 1a and the PET transparent film 10 are peeled off and wound on the corresponding winding drums 4, the PE protective film 12 on the release B film 1B and the PET transparent film 10 are peeled off and wound on the corresponding winding drums 4, the PE protective film 12 of the release A film 1a and the release B film 1B are continuously peeled off by the winding drums 4 in the process of entering a rolling channel along with the thick lithium belt 2, and the ultrathin lithium foil belt 20 with the release A film 1a and the release B film 1B, of which the protective films are peeled off, is respectively manufactured at the two sides behind the same-speed rolling device 3.
For the release a film 1 a/release B film 1B in the rolled state, the coated side and the non-coated side are isolated by the protective film, and silicone oil on the coated side is transferred to the surface of the protective film instead of being transferred to the non-coated side; when the ultrathin lithium foil is rolled, the non-coated surfaces of the release A film 1a and the release B film 1B are respectively contacted with the rollers 30 at two sides of the rolling channel, so that the defect that the non-coated surfaces and the rollers 30 slide relatively due to the adhesion of silicone oil is overcome.
The foregoing is a preferred embodiment of the present invention, and it will be apparent to those skilled in the art that variations and modifications can be made without departing from the principles of the invention, and these should also be considered as being within the scope of the invention.
Claims (7)
1. A compound release film combination for lithium ion battery processing which characterized in that: the novel film comprises a release A film (1 a) and a release B film (1B), wherein the release A film (1 a) and the release B film (1B) comprise a film main body, a release layer (11) and a protective film, the two surfaces of the film main body are respectively a coating surface and a non-coating surface, the release layer (11) is attached to the coating surface of the film main body, and the protective film is detachably compounded on the non-coating surface of the film main body.
2. The composite release film combination for lithium ion battery processing of claim 1, wherein:
release film A (1 a): the release force of the release layer (11) is 4-6g/in, the residual adhesion rate is 60-80%, and the dry coating weight of the release agent is 0.4-0.6g/m 2 ；
Release film B (1B): the release force of the release layer (11) is 3-5g/in, the residual adhesion rate is 80-100%, and the dry coating weight of the release agent is 0.8-1.2g/m 2 。
3. The composite release film combination for lithium ion battery processing according to claim 1 or 2, wherein: the protective film is a PE protective film (12), and the PE protective film (12) is attached and fixed on the non-coated surface of the film main body through a second unreeling system.
4. The processing technology of the composite release film for processing the lithium ion battery is characterized by comprising the following steps of:
1) Preparing a parting agent;
2) First unreeling: selecting a PET film as a film main body, and unreeling the PET film placed on the winding drum;
3) Coating: coating the release agent prepared in the step 1) on one surface of the unreeled film main body;
4) And (3) drying: drying and curing the release agent coated on the surface of the film main body by using an oven;
5) And (3) second unreeling: PE film is selected as a protective film, and PE protective film placed on a winding drum is subjected to
(12) Unreeling operation is carried out;
6) Compounding: compounding the film main body discharged from the oven with an unreeled PE protective film (12), wherein the PE protective film (12) is attached to the non-coating surface of the film main body;
7) And (3) cooling: the composite film is prepared by cooling the composite film main body and the PE protective film (12);
8) And (3) rolling: and rolling the cooled composite film.
5. The process for manufacturing a composite release film for lithium ion battery manufacturing according to claim 4, wherein: the release agents with two proportions are respectively coated on the film main body to respectively prepare a release A film (1 a) and a release B film (1B),
the release agent adopted for the release A film (1 a) comprises a silicone oil system and a solvent, wherein the silicone oil system comprises 1000 parts of a silicone oil main agent, 15-25 parts of a cross-linking agent, 5-15 parts of an anchoring agent, 15-30 parts of a catalyst and 15-25 parts of a stripping force additive;
the release agent adopted for the release film B (1B) comprises 1000 parts of silicone oil system and 15-25 parts of cross-linking agent, 5-15 parts of anchoring agent, 15-30 parts of catalyst and 5-15 parts of anti-sticking auxiliary agent, wherein the silicone oil system comprises 1000 parts of silicone oil main agent and solvent.
6. The process for manufacturing a composite release film for lithium ion battery manufacturing according to claim 4, wherein: the release agents with two proportions are respectively coated on the film main body to respectively prepare a release A film (1 a) and a release B film (1B),
for the release agent adopted by the release A film (1 a), the release force is 4-6g/in after 20min, the residual adhesive rate is 60-80%, and the dry coating weight of the release agent is 0.4-0.6g/m 2 ；
For the release agent adopted by the release B film (1B), the release force is 3-5g/in after 20min, the residual adhesive rate is 80-100%, and the dry coating weight of the release agent is 0.8-1.2g/m 2 。
7. Application of a composite release film combination for lithium ion battery processing on a rolled ultrathin lithium foil belt is characterized in that: the composite release film combination comprises a release A film (1 a) and a release B film (1B) in the claim 1; the raw material used for rolling the ultrathin lithium foil strip (20) is a thick lithium strip (2); the adopted apparatus comprises a same-speed rolling device (3) and a protective film separating device, wherein the same-speed rolling device (3) comprises at least one group of press roller mechanisms, each press roller mechanism comprises two rollers (30) with the same speed and opposite rotation directions, and a rolling channel is formed between the two rollers (30); the specific application mode of the composite release film combination on the rolling ultrathin lithium foil strip (20) is as follows: the method comprises the steps that a release A film (1 a), a release B film (1B) and a thick lithium belt (2) pass through a rolling channel of a same-speed rolling device (3) together for rolling and thinning, the thick lithium belt (2) is clamped between the release A film (1 a) and the release B film (1B), the coating surface of the release A film (1 a) faces one surface of the thick lithium belt (2), the coating surface of the release B film (1B) faces the other surface of the thick lithium belt (2), the release A film (1 a) and the release B film (1B) are peeled off by a protective film separating device before entering the same-speed rolling device (3), and ultrathin lithium foil belts (20) with the release A film (1 a) and the release B film (1B) with the protective films peeled off are manufactured at two sides behind the same-speed rolling device (3);
for the release A film (1 a)/release B film (1B) in a rolled state, the coated surface and the non-coated surface are isolated by the protective film, and silicone oil on the coated surface is transferred to the surface of the protective film to replace the silicone oil on the coated surface and the non-coated surface; when the ultrathin lithium foil is rolled, the non-coated surfaces of the release A film (1 a) and the release B film (1B) are respectively contacted with the rollers (30) at two sides of the rolling channel, so that the defect that the non-coated surfaces and the rollers (30) slide relatively due to the adhesion of silicone oil is overcome.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310740630.1A CN116749627A (en) | 2023-06-20 | 2023-06-20 | Composite release film for lithium ion battery processing, processing technology and application |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310740630.1A CN116749627A (en) | 2023-06-20 | 2023-06-20 | Composite release film for lithium ion battery processing, processing technology and application |
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| Publication Number | Publication Date |
|---|---|
| CN116749627A true CN116749627A (en) | 2023-09-15 |
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|---|---|---|---|
| CN202310740630.1A Pending CN116749627A (en) | 2023-06-20 | 2023-06-20 | Composite release film for lithium ion battery processing, processing technology and application |
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| Country | Link |
|---|---|
| CN (1) | CN116749627A (en) |
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2023
- 2023-06-20 CN CN202310740630.1A patent/CN116749627A/en active Pending
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