CN116899803A - Porous foil coating device and coating process - Google Patents

Porous foil coating device and coating process Download PDF

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Publication number
CN116899803A
CN116899803A CN202310676614.0A CN202310676614A CN116899803A CN 116899803 A CN116899803 A CN 116899803A CN 202310676614 A CN202310676614 A CN 202310676614A CN 116899803 A CN116899803 A CN 116899803A
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China
Prior art keywords
porous foil
coating
roll
protective
foil
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Pending
Application number
CN202310676614.0A
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Chinese (zh)
Inventor
李占海
马晨曦
赵珮竹
李彬
王仁念
杨嫚
王博
齐小鹏
王建涛
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China Automotive Battery Research Institute Co Ltd
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China Automotive Battery Research Institute Co Ltd
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Priority to CN202310676614.0A priority Critical patent/CN116899803A/en
Publication of CN116899803A publication Critical patent/CN116899803A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/06—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length by rubbing contact, e.g. by brushes, by pads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C13/00—Means for manipulating or holding work, e.g. for separate articles
    • B05C13/02—Means for manipulating or holding work, e.g. for separate articles for particular articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/28—Processes for applying liquids or other fluent materials performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/04—Processes of manufacture in general
    • H01M4/0402—Methods of deposition of the material
    • H01M4/0404—Methods of deposition of the material by coating on electrode collectors
    • 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

Abstract

The invention relates to the technical field of lithium ion batteries, in particular to a porous foil coating device and a porous foil coating process. The porous foil coating device comprises a porous foil unreeling mechanism, a protective unreeling mechanism, a flattening roller, a coating mechanism, an oven and a porous foil reeling mechanism, wherein during coating, the porous foil unreeling mechanism and the protective unreeling mechanism simultaneously unreel the porous foil and the protective reel, the unreeled porous foil and the protective reel are compressed and wrinkle-removed at the flattening roller, the porous foil and the protective reel are coated through the coating mechanism, then the protective reel and the pole piece are peeled after the slurry is dried through the oven or after no fluidity is caused in the drying process, and the peeled pole piece is reeled through the porous foil unreeling mechanism. According to the invention, the protective roll unreeling mechanism is added at the machine head of the coating mechanism, the protective roll unreels in the porous foil coating process, the protective roll is added on the basis of the existing coating process, the slurry is prevented from penetrating through the porous foil and being adhered to the roller passing through the equipment, and the normal coating is ensured.

Description

Porous foil coating device and coating process
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a porous foil coating device and a porous foil coating process.
Background
With the development of technology, various fields have higher requirements on the endurance of lithium batteries, and the lithium batteries with higher energy density have better endurance under the same mass/volume. The simplest way to increase the energy density is to reduce the weight, and the lithium battery is light, and the way to lighten the pole piece is to introduce porous foil. Compared with the common foil, the porous foil current collector has a three-dimensional pore structure, so that the weight ratio of the foil in the battery core can be reduced on the one hand, and the energy density is improved; on the other hand, the contact area between the positive and negative electrode active materials and the foil can be increased, the impedance is reduced, and the electrical property is further improved.
For porous foil, after single-sided coating, the slurry can permeate to the other side through the foil pores in the process of travelling and entering an oven, so that materials are bonded on a roll of equipment, and the subsequent materials have abnormal appearance or are broken, so that normal production cannot be performed.
Disclosure of Invention
The invention provides a porous foil coating process which is used for solving the technical problems existing in the prior porous foil coating process.
According to a first aspect of the invention, the invention provides a porous foil coating device, which comprises a porous foil unreeling mechanism, a protective roll unreeling mechanism, a flattening roller, a coating mechanism, an oven and a porous foil reeling mechanism, wherein during coating, the porous foil unreeling mechanism and the protective roll unreeling mechanism simultaneously carry out porous foil unreeling and protective roll unreeling, the unreeled porous foil and protective roll are compressed and wrinkle-removed at the flattening roller, then are coated by the coating mechanism, then are subjected to stripping of the protective roll and a pole piece after being dried by the oven or after no fluidity of slurry is caused in the drying process, and the stripped pole piece is reeled by the porous foil unreeling mechanism.
In the scheme, aiming at the problem that slurry permeation risk possibly exists in the porous foil pore in the coating process, so that coating cannot be performed normally, the invention provides a porous foil coating device, which comprises a porous foil unreeling mechanism, a protective unreeling mechanism, a flattening roller, a coating mechanism, an oven and a porous foil reeling mechanism, wherein the protective unreeling mechanism is additionally arranged at the machine head of the coating mechanism, unreeling of the protective reel is performed simultaneously in the porous foil coating process, the protective reel is ensured to be positioned at the lower layer of the porous foil, the protective reel is additionally arranged on the basis of the existing coating process, the slurry is prevented from permeating the porous foil and adhering to the roller of equipment, the coating is ensured to be performed normally, and meanwhile, the coating equipment is not modified excessively, and the existing coating process is not modified excessively, so that the influence on the coating productivity is small.
Further, the porous foil coating device further comprises a protection winding mechanism, and the peeled protection winding is wound by the protection winding mechanism.
In the scheme, the porous foil coating device further comprises a protection winding mechanism, the pole piece slurry is dried by the oven and is separated from the pole piece after no fluidity, the protection winding is independently wound by the protection winding mechanism added at the tail of the coating machine, and the pole piece is normally wound.
Further, the porous foil coating device further comprises a roller, and the peeled protective roll is connected with the protective roll unreeling mechanism through the roller.
In the scheme, the porous foil coating device further comprises a roller, and the peeled protective roll is connected with the protective roll unreeling mechanism through the roller, so that the protective roll can be recycled.
Further, the porous foil coating device further comprises a cleaning mechanism, and the peeled protection roll is cleaned by the cleaning mechanism.
In the scheme, the porous foil coating device further comprises a cleaning mechanism, the corresponding cleaning mechanism is added before the protection coil is wound, and residual slurry residues on the protection coil are cleaned, so that the protection coil can be recycled.
Further, the cleaning mechanism can be a brush, a colloid coating and a corresponding solvent spraying device (absolute ethyl alcohol/deionized water is adopted for the negative electrode, and NMP is adopted for the positive electrode).
Further, the coating mechanism comprises a coater, which is a transfer coater, an extrusion coater, or a gravure coater.
According to a second aspect of the present invention, the present invention further provides a porous foil coating process, wherein the porous foil coating process is performed by using the porous foil coating device, and the process comprises the following steps:
the porous foil unreeling mechanism and the protective roll unreeling mechanism are used for simultaneously unreeling the porous foil and unreeling the protective roll, and the protective roll is ensured to be positioned at the lower layer of the porous foil;
the unreeled porous foil and the protective roll are compressed and wrinkle-removed at the flattening roller, then are coated by the coating mechanism, and are stripped after being dried by the oven or after the slurry has no fluidity in the drying process;
the stripped pole piece is rolled up by the porous foil unreeling mechanism; the peeled protective roll is wound by a protective roll winding mechanism or is connected with a protective roll unwinding mechanism by a roller.
In the scheme, the porous foil coating process realizes process optimization of porous foil coating by optimizing the existing coating machine, and the solution is that the protective roll is arranged below the porous foil to ensure that slurry cannot permeate to the other side in the coating process, so that the passing roller is neat and the follow-up coating is not influenced.
Further, the method also comprises the following steps: the peeled protective roll is cleaned by a cleaning mechanism and then is wound by a protective roll winding mechanism or is connected with a protective roll unwinding mechanism by a roller.
In the scheme, residual slurry residues on the protection coil are cleaned by the cleaning mechanism, so that the protection coil can be recycled.
Further, the porous foil is formed by dense perforation or electrodeposition; the porosity of the porous foil is more than 0 and less than or equal to 60%; the thickness of the porous foil is 3-20 mu m.
In the scheme, the porous foil porosity and the thickness are limited, so that the weight ratio of the foil in the battery core can be reduced on one hand, and the energy density is improved; on the other hand, the contact area between the positive and negative electrode active materials and the foil can be increased, the impedance is reduced, and the electrical property is further improved.
Further, the width of the protective roll is greater than or equal to the width of the porous foil; and/or the protective roll has a thickness of 6 μm to 12 μm.
In the scheme, the width of the protection coil is larger than or equal to that of the porous foil, so that the porous foil can be better protected, the slurry is prevented from penetrating to the other side in the coating process, the roller passing is neat, and the follow-up coating is not influenced.
Further, the material of the protective roll is foil or high-temperature resistant film; preferably, the foil is copper foil or aluminum foil, and the high-temperature-resistant film is a high-temperature-resistant PE film.
In the scheme, the protection coil material type is limited, so that the protection coil material can be easily separated from the pole piece, the pole piece has no higher viscosity, and the pole piece is not damaged during stripping.
The invention provides a porous foil coating device, which aims at the problem that slurry permeation risk possibly exists in the porous foil pore in the coating process, so that coating cannot be normally performed.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the 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 structural diagram of a porous foil coating device according to embodiment 1 of the present invention;
fig. 2 is a schematic structural diagram of a porous foil coating device according to embodiment 2 of the present invention;
fig. 3 is a schematic structural diagram of a porous foil coating device according to embodiment 3 of the present invention;
fig. 4 is a schematic structural diagram of a porous foil coating device according to embodiment 4 of the present invention.
Reference numerals:
1: a porous foil unreeling mechanism; 2: a protective roll unreeling mechanism; 3: a flattening roller; 4: a coating mechanism; 5: an oven; 6: a porous foil winding mechanism; 7: a protective roll winding mechanism; 8: a cleaning mechanism; 9: passing through a roller.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. 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.
Example 1
The embodiment provides a porous foil coating device, as shown in fig. 1, the porous foil coating device comprises a porous foil unreeling mechanism 1, a protective roll unreeling mechanism 2, a spreading roller 3, a coating mechanism 4, an oven 5, a porous foil reeling mechanism 6, a protective roll reeling mechanism 7 and a cleaning mechanism 8, when in coating, the porous foil unreeling mechanism 1 and the protective roll unreeling mechanism 2 simultaneously carry out porous foil unreeling and protective roll unreeling, the unreeled porous foil and protective roll are compressed and wrinkle-removed at the spreading roller 3, then are coated by the coating mechanism 4, then are dried by the oven 5, the protective roll and a pole piece are stripped, and the pole piece after stripping is reeled by the porous foil unreeling mechanism 6. The peeled protective roll is cleaned by a cleaning mechanism 8 and then is wound by a protective roll winding mechanism 7.
Example 2
The embodiment provides a porous foil coating device, as shown in fig. 2, the porous foil coating device comprises a porous foil unreeling mechanism 1, a protective roll unreeling mechanism 2, a flattening roller 3, a coating mechanism 4, an oven 5, a porous foil reeling mechanism 6, a passing roller 9 and a cleaning mechanism 8, when in coating, the porous foil unreeling mechanism 1 and the protective roll unreeling mechanism 2 simultaneously carry out porous foil unreeling and protective roll unreeling, the unreeled porous foil and the protective roll are compressed and wrinkle-removed at the flattening roller 3, then are coated by the coating mechanism 4, then are dried by the oven 5, then are stripped off, and the stripped pole piece is reeled by the porous foil unreeling mechanism 6. The peeled protective roll is cleaned by a cleaning mechanism 8 and then connected with the protective roll unreeling mechanism 2 by a roller 9, so that the protective roll can be recycled.
Example 3
The embodiment provides a porous foil coating device, as shown in fig. 1, the porous foil coating device comprises a porous foil unreeling mechanism 1, a protective roll unreeling mechanism 2, a flattening roller 3, a coating mechanism 4, an oven 5, a porous foil reeling mechanism 6, a protective roll reeling mechanism 7 and a cleaning mechanism 8, when in coating, the porous foil unreeling mechanism 1 and the protective roll unreeling mechanism 2 simultaneously carry out porous foil unreeling and protective roll unreeling, the unreeled porous foil and protective roll are compressed and wrinkle-removed at the flattening roller 3, then are coated by the coating mechanism 4, then the slurry is stripped after no fluidity in the drying process of the oven 5, and the stripped pole piece is reeled by the porous foil unreeling mechanism 6. The peeled protective roll is cleaned by a cleaning mechanism 8 and then is wound by a protective roll winding mechanism 7.
Example 4
The embodiment provides a porous foil coating device, as shown in fig. 4, the porous foil coating device comprises a porous foil unreeling mechanism 1, a protective roll unreeling mechanism 2, an unfolding flat roller 3, a coating mechanism 4, an oven 5, a porous foil reeling mechanism 6, a passing roller 9 and a cleaning mechanism 8, when in coating, the porous foil unreeling mechanism 1 and the protective roll unreeling mechanism 2 simultaneously carry out unreeling and protective roll unreeling, the unreeled porous foil and protective roll are compressed and wrinkle-removed at the position of the flattening roller 3, then are coated by the coating mechanism 4, then are peeled off by the protective roll and a pole piece after no fluidity of slurry in the drying process of the oven 5, and the pole piece after peeling is reeled by the porous foil unreeling mechanism 6. The peeled protective roll is cleaned by a cleaning mechanism 8 and then connected with the protective roll unreeling mechanism 2 by a roller 9, so that the protective roll can be recycled.
Example 5
The embodiment provides a porous foil coating process, which adopts the porous foil coating device of the embodiment 1, and the positive and negative electrode coating preparation method comprises the following steps:
coating a positive electrode: ternary materials NCM811, SP and PVDF are adopted, NMP is taken as a solvent, and the ratio is 95%:2%:3% of the mixture is uniformly stirred and then coated on a porous foil current collector to be used as a positive electrode active material layer, and the coating surface density is 19.35mg/cm 2 The coating speed is 5m/min, and the protective coil is made of 12um aluminum foil. The porous foil has a porosity of 17% and a thicknessThe degree was 12. Mu.m.
Coating a negative electrode: graphite and SP, CMC, SBR are adopted, deionized water is used as a solvent, and the ratio is 96 percent: 1%:1%:1.5% of the mixture is uniformly stirred and then coated on a porous foil current collector to be used as a negative electrode active material layer, wherein the coating surface density is 7.05mg/cm 2 The coating speed is 5m/min, and the copper foil with 6um is selected as the protection coil. The porous foil has a porosity of 25% and a thickness of 6 μm.
And after the pole piece is coated and dried, the pole piece is subjected to stripping force test by selecting a protection coil and a pole piece which is not separated from the pole piece, so that the protection coil is not damaged by stripping, and specific test data are shown in table 1.
Example 6
The embodiment provides a porous foil coating process, which adopts the porous foil coating device of the embodiment 1, and the positive and negative electrode coating preparation method comprises the following steps:
coating a positive electrode: ternary materials NCM811, SP and PVDF are adopted, NMP is taken as a solvent, and the ratio is 95%:2%:3% of the mixture is uniformly stirred and then coated on a porous foil current collector to be used as a positive electrode active material layer, and the coating surface density is 20.24mg/cm 2 The coating speed is 4.5m/min, and the protective coil is made of aluminum foil with the thickness of 12 um. The porous foil had a porosity of 17% and a thickness of 12. Mu.m.
Coating a negative electrode: graphite and SP, CMC, SBR are adopted, deionized water is used as a solvent, and the ratio is 96 percent: 1%:1%:1.5% of the mixture is uniformly stirred and then coated on a porous foil current collector to be used as a negative electrode active material layer, wherein the coating surface density is 7.45mg/cm 2 The coating speed is 4.5m/min, and the copper foil with 6um is selected as the protection coil. The porous foil has a porosity of 25% and a thickness of 6 μm.
And after the pole piece is coated and dried, the pole piece is subjected to stripping force test by selecting a protection coil and a pole piece which is not separated from the pole piece, so that the protection coil is not damaged by stripping, and specific test data are shown in table 1.
Example 7
The embodiment provides a porous foil coating process, which adopts the porous foil coating device of the embodiment 1, and the positive and negative electrode coating preparation method comprises the following steps:
coating a positive electrode: using ternary materials NCM811, SP andPVDF, NMP as solvent, at a ratio of 95%:2%:3% of the mixture is uniformly stirred and then coated on a porous foil current collector to be used as a positive electrode active material layer, and the coating surface density is 22.3mg/cm 2 The coating speed is 4m/min, and the protective coil is made of 12um aluminum foil. The porous foil had a porosity of 17% and a thickness of 12. Mu.m.
Coating a negative electrode: graphite and SP, CMC, SBR are adopted, deionized water is used as a solvent, and the ratio is 96 percent: 1%:1%:1.5% of the mixture is uniformly stirred and then coated on a porous foil current collector to be used as a negative electrode active material layer, wherein the coating surface density is 8.05mg/cm 2 The coating speed is 4m/min, and the copper foil with 6um is selected as the protection coil. The porous foil has a porosity of 25% and a thickness of 6 μm.
And after the pole piece is coated and dried, the pole piece is subjected to stripping force test by selecting a protection coil and a pole piece which is not separated from the pole piece, so that the protection coil is not damaged by stripping, and specific test data are shown in table 1.
Example 8
The embodiment provides a porous foil coating process, which adopts the porous foil coating device of the embodiment 1, and the positive and negative electrode coating preparation method comprises the following steps:
coating a positive electrode: ternary materials NCM811, SP and PVDF are adopted, NMP is taken as a solvent, and the ratio is 95%:2%:3% of the mixture is uniformly stirred and then coated on a porous foil current collector to be used as a positive electrode active material layer, wherein the coating surface density is 24.6mg/cm 2 The coating speed is 3.8m/min, and the protective coil is made of aluminum foil with the thickness of 12 um. The porous foil had a porosity of 17% and a thickness of 12. Mu.m.
Coating a negative electrode: graphite and SP, CMC, SBR are adopted, deionized water is used as a solvent, and the ratio is 96 percent: 1%:1%:1.5% of the mixture is uniformly stirred and then coated on a porous foil current collector to be used as a negative electrode active material layer, wherein the coating surface density is 8.24mg/cm 2 The coating speed is 3.8m/min, and the copper foil with 6um is selected as the protection coil. The porous foil has a porosity of 25% and a thickness of 6 μm.
And after the pole piece is coated and dried, the pole piece is subjected to stripping force test by selecting a protection coil and a pole piece which is not separated from the pole piece, so that the protection coil is not damaged by stripping, and specific test data are shown in table 1.
Example 9
The embodiment provides a porous foil coating process, which adopts the porous foil coating device of the embodiment 1, and the positive and negative electrode coating preparation method comprises the following steps:
coating a positive electrode: ternary materials NCM811, SP and PVDF are adopted, NMP is taken as a solvent, and the ratio is 95%:2%:3% of the mixture is uniformly stirred and then coated on a porous foil current collector to be used as a positive electrode active material layer, wherein the coating surface density is 24.6mg/cm 2 The coating speed is 3.8m/min, and the protective coil is a 10um high temperature resistant PE film. The porous foil had a porosity of 17% and a thickness of 12. Mu.m.
Coating a negative electrode: graphite and SP, CMC, SBR are adopted, deionized water is used as a solvent, and the ratio is 96 percent: 1%:1%:1.5% of the mixture is uniformly stirred and then coated on a porous foil current collector to be used as a negative electrode active material layer, wherein the coating surface density is 8.24mg/cm 2 The coating speed is 3.8m/min, and the protective coil is a 10um high temperature resistant PE film. The porous foil has a porosity of 25% and a thickness of 6 μm.
And after the pole piece is coated and dried, the pole piece is subjected to stripping force test by selecting a protection coil and a pole piece which is not separated from the pole piece, so that the protection coil is not damaged by stripping, and specific test data are shown in table 1.
Comparative example 1
This comparative example provides a porous foil coating process that differs from example 5 in that no protective roll is used in the coating process.
Coating a positive electrode: ternary materials NCM811, SP and PVDF are adopted, NMP is taken as a solvent, and the ratio is 95%:2%:3% of the mixture is uniformly stirred and then coated on a porous foil current collector to be used as a positive electrode active material layer, and the coating surface density is 19.35mg/cm 2 The coating speed was 5m/min. The porous foil had a porosity of 17% and a thickness of 12. Mu.m.
Coating a negative electrode: graphite and SP, CMC, SBR are adopted, deionized water is used as a solvent, and the ratio is 96 percent: 1%:1%:1.5% of the mixture is uniformly stirred and then coated on a porous foil current collector to be used as a negative electrode active material layer, wherein the coating surface density is 7.05mg/cm 2 The coating speed was 5m/min, the porosity of the porous foil was 25% and the thickness was 6. Mu.m.
TABLE 1
The comparison between the embodiment and the comparative example shows that the addition of the protective roll effectively prevents slurry permeation in the coating process of the porous foil, ensures normal coating, and after drying, the protective roll can be normally separated from the pole piece under the drying conditions of different surface densities and different machine speeds without damaging the pole piece. Therefore, by improving equipment and adding a protection coil related mechanism, the process improvement of the porous foil can be realized, so that the porous foil can be normally coated, the lightweight design of the pole piece is realized, and the energy density of the battery is improved.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. The utility model provides a porous foil coating device, its characterized in that includes porous foil unreels mechanism, protection roll unreels mechanism, nip roll, coating mechanism, oven and porous foil winding mechanism, during the coating, porous foil unreels the mechanism with protection roll unreels the mechanism and carries out porous foil unreels simultaneously, and the porous foil of unreeling and protection roll are in nip roll department compresses tightly and removes the wrinkle, again through coating mechanism carries out the coating, then through after the oven is dried or after the drying process thick liquids do not have flowability, carries out the peeling off of protection roll and pole piece, the pole piece after peeling off is through porous foil unreels the mechanism rolling.
2. The porous foil coating apparatus of claim 1, further comprising a protective roll-up mechanism, the peeled protective roll being wound up by the protective roll-up mechanism.
3. The porous foil coating apparatus of claim 1, further comprising a pass roller through which the peeled protective roll is connected to the protective roll unreeling mechanism.
4. A porous foil coating apparatus as claimed in any one of claims 1 to 3, further comprising a cleaning mechanism by which the peeled protective roll is cleaned.
5. The porous foil coating apparatus of claim 1, wherein the coating mechanism comprises a coater that is a transfer coater, a squeeze coater, or a gravure coater.
6. A porous foil coating process, characterized in that the porous foil coating device according to any one of claims 1-5 is used for porous foil coating, comprising the steps of:
the porous foil unreeling mechanism and the protective roll unreeling mechanism are used for simultaneously unreeling the porous foil and unreeling the protective roll, and the protective roll is ensured to be positioned at the lower layer of the porous foil;
the unreeled porous foil and the protective roll are compressed and wrinkle-removed at the flattening roller, then are coated by the coating mechanism, and are stripped after being dried by the oven or after the slurry has no fluidity in the drying process;
the stripped pole piece is rolled up by the porous foil unreeling mechanism; the peeled protective roll is wound by a protective roll winding mechanism or is connected with a protective roll unwinding mechanism by a roller.
7. The porous foil coating process of claim 6, further comprising the steps of: the peeled protective roll is cleaned by a cleaning mechanism and then is wound by a protective roll winding mechanism or is connected with a protective roll unwinding mechanism by a roller.
8. The porous foil coating process of claim 6, wherein the porous foil is formed by dense perforation or electrodeposition; the porosity of the porous foil is more than 0 and less than or equal to 60%; the thickness of the porous foil is 3-20 mu m.
9. The porous foil coating process of claim 6, wherein the width of the protective roll is equal to or greater than the width of the porous foil; and/or the protective roll has a thickness of 6 μm to 12 μm.
10. The porous foil coating process of claim 6, wherein the material of the protective roll is foil or a high temperature resistant film; preferably, the foil is copper foil or aluminum foil, and the high-temperature-resistant film is a high-temperature-resistant PE film.
CN202310676614.0A 2023-06-08 2023-06-08 Porous foil coating device and coating process Pending CN116899803A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310676614.0A CN116899803A (en) 2023-06-08 2023-06-08 Porous foil coating device and coating process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310676614.0A CN116899803A (en) 2023-06-08 2023-06-08 Porous foil coating device and coating process

Publications (1)

Publication Number Publication Date
CN116899803A true CN116899803A (en) 2023-10-20

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