CN114039025A - Lithium ion battery electrode preparation process and gravure printing equipment - Google Patents

Lithium ion battery electrode preparation process and gravure printing equipment Download PDF

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Publication number
CN114039025A
CN114039025A CN202111328089.0A CN202111328089A CN114039025A CN 114039025 A CN114039025 A CN 114039025A CN 202111328089 A CN202111328089 A CN 202111328089A CN 114039025 A CN114039025 A CN 114039025A
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CN
China
Prior art keywords
negative electrode
printing
lithium ion
ion battery
printing plate
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202111328089.0A
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Chinese (zh)
Inventor
胡朝帅
王茂范
胡伟东
徐亚杰
袁园
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Svolt Energy Technology Co Ltd
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Svolt Energy Technology Co Ltd
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Publication date
Application filed by Svolt Energy Technology Co Ltd filed Critical Svolt Energy Technology Co Ltd
Priority to CN202111328089.0A priority Critical patent/CN114039025A/en
Publication of CN114039025A publication Critical patent/CN114039025A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F9/00—Rotary intaglio printing presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F9/00—Rotary intaglio printing presses
    • B41F9/06—Details
    • B41F9/061—Inking devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F9/00—Rotary intaglio printing presses
    • B41F9/06—Details
    • B41F9/08—Wiping mechanisms
    • B41F9/10—Doctors, scrapers, or like devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/10—Intaglio printing ; Gravure printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/26—Printing on other surfaces than ordinary paper
    • 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
    • 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
    • H01M4/0419—Methods of deposition of the material involving spraying
    • 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
    • H01M4/043—Processes of manufacture in general involving compressing or compaction
    • H01M4/0435—Rolling or calendering
    • 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
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/139—Processes of manufacture
    • 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 preparation process of a lithium ion battery electrode and gravure printing equipment. According to the preparation process of the lithium ion battery electrode, after coating and drying are finished, a negative electrode slurry layer is printed or sprayed on a negative electrode thinning area, and the thickness of the negative electrode slurry layer is smaller than 15 micrometers. The gravure printing equipment comprises a printing plate roller, wherein a plurality of grooves are uniformly distributed on the circumferential surface of part of shaft sections of the printing plate roller along the circumferential direction to form a nicked area; and the impression roller is axially parallel to the printing plate roller and axially corresponds to the printing plate roller, and the impression roller is suitable for being connected with the printing plate roller to finish printing. The preparation process of the lithium ion battery electrode provided by the invention can fill up the thickness difference of the anode and cathode thinning areas, increase the surface density of the cathode thinning area, improve the NP ratio of the thinning area and solve the problem of lithium recycling caused by thinning.

Description

Lithium ion battery electrode preparation process and gravure printing equipment
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a preparation process of a lithium ion battery electrode and gravure printing equipment.
Background
With the increasing environmental pollution, people have stronger requirements on clean energy such as electric energy and the like, and the lithium ion battery is widely applied as a good carrier of the electric energy. The preparation of the lithium ion battery electrode generally comprises the procedures of slurry preparation, coating, drying, rolling and the like. Wherein, the coating is to uniformly stir the materials and then coat the materials on the surface of the copper/aluminum foil to form an active substance layer; and the rolling is to carry out double-roller compaction on the coated and dried pole piece.
During coating, due to the existence of surface tension, the slurry can be gathered towards the edge, so that the thickness of the slurry at the edge is larger than that of the slurry in the middle, and the subsequent processes such as rolling and the like are not facilitated. The existing improvement method is to reduce the coating amount of the edge area by chamfering the edge of the coating die head during coating, and form a thinning area, thereby eliminating the influence of surface tension on the edge thickness. However, under the influence of process reasons, the slurry fluctuation of the thinning area on the pole piece is large, so that the negative electrode capacity is easily smaller than the positive electrode capacity, and further the lithium precipitation phenomenon at the upper edge of the negative electrode occurs in the use process of the battery.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defect that lithium is easy to precipitate on the upper edge of the lithium ion battery cathode in the prior art, thereby providing a preparation process of the lithium ion battery cathode and gravure printing equipment.
In order to solve the technical problem, according to the preparation process of the lithium ion battery electrode, after coating and drying are finished, a negative electrode slurry layer is printed or sprayed on a negative electrode thinning area, and the thickness of the negative electrode slurry layer is smaller than 15 microns.
Optionally, the printing is gravure printing, and includes the following steps:
s1, homogenizing the negative electrode slurry to prepare slurry with viscosity less than 1000 mPas to be suitable for gravure printing;
s2, selecting proper gravure printing equipment to enable the width of the indented area to be less than or equal to the width of the negative electrode thinning area;
s3, placing the negative pole piece to be processed on a station of the gravure printing equipment, so that a negative pole thinning area corresponds to the nicking area;
and S4, transferring the slurry prepared in the step S1 to a trough of the scored area, starting the gravure printing equipment, and printing the negative electrode thinning area to form the negative electrode slurry layer.
Optionally, in step S4, drying is performed after printing, where the drying temperature is 80 to 120 ℃.
Optionally, in step S1, the viscosity of the slurry is 100 to 200mPa S.
Optionally, the width of the negative electrode slurry layer is 5 mm-10 mm.
Optionally, the thickness of the negative electrode slurry layer is 4-5 μm.
The present invention provides a gravure printing apparatus, comprising:
the printing plate roller is provided with a plurality of grooves uniformly distributed on the circumferential surface of part of the shaft section along the circumferential direction to form a nick area;
and the impression roller is axially parallel to the printing plate roller and axially corresponds to the printing plate roller, and the impression roller is suitable for being connected with the printing plate roller to finish printing.
Optionally, the groove is a strip-shaped groove, and the length direction of the strip-shaped groove is parallel to the axial direction of the printing plate roller.
Optionally, the printing plate cylinder is located below the impression cylinder, and further includes:
the upper end of the slurry box is open and is suitable for containing slurry;
the lower part of the printing plate roller is arranged in the slurry box.
Optionally, the method further includes:
and the scraper is fixed relative to the slurry box and is suitable for scraping the slurry protruding from the circumferential surface of the printing plate roller.
The technical scheme of the invention has the following advantages:
1. according to the preparation process of the lithium ion battery electrode, the negative electrode slurry layer is printed or sprayed in the negative electrode thinning area after drying, so that the thickness difference of the positive and negative electrode thinning areas can be filled, the surface density of the negative electrode thinning area is increased, the NP ratio of the thinning area is improved, and the problem of circulating lithium precipitation caused by thinning can be solved. In addition, the process can improve the phenomenon of lithium precipitation, so that the debugging of a die head during the primary coating of the negative electrode can be reduced, the production efficiency of the battery is improved, and the service life of the battery is prolonged.
2. According to the preparation process of the lithium ion battery electrode, the thickness of the negative electrode slurry layer is 4-5 microns, the influence on the coating thickness is small, and the subsequent processing of the electrode plate is not adversely affected.
3. The gravure printing equipment provided by the invention can ensure that the thickness of the cathode slurry layer is maintained at a small value, and meets the process requirements; and the rolling mode is to roll the whole pole piece, so that the deformation of the pole piece caused by uneven stress can be avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flow chart of a process for preparing an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a gravure printing apparatus according to an embodiment of the present invention;
fig. 3 is a schematic view of the working state of the gravure printing equipment according to the embodiment of the invention.
Description of reference numerals:
1. a plate cylinder; 11. a scored region; 2. embossing the roller; 3. a slurry box; 4. a scraper; 5. a negative tab; 51. and a cathode thinning area.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, only for convenience of description and simplification of description, and do not indicate or imply that the intaglio printing apparatus or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example one
Referring to fig. 1 and fig. 3, in the preparation process of the lithium ion battery electrode provided in this embodiment, after the coating is completed and dried, a negative electrode slurry layer is printed or sprayed on the negative electrode thinning region 51, where the thickness of the negative electrode slurry layer is less than 15 μm, preferably 4 to 5 μm, and specifically may be 4 μm, 4.5 μm, or 5 μm. The negative electrode slurry layer can be in a common solid layer structure or a hollow layer structure.
In the lithium ion battery electrode preparation process of the embodiment, after the drying is completed, the negative electrode slurry layer is printed or sprayed on the negative electrode thinning region 51, so that the area density of the region can be increased, the NP ratio can be increased, and the problem of lithium precipitation of the negative electrode can be solved.
As a preferable mode of the above technical means, the printing is gravure printing, and the method comprises the following steps:
s1, homogenizing the negative electrode slurry to prepare slurry with viscosity less than 1000 mPas to be suitable for gravure printing; preferably 100 to 200 mPas, in particular 100 or 150 or 200 mPas.
S2, selecting proper gravure printing equipment to enable the width of the indented area 11 to be smaller than or equal to the width of the negative electrode thinning area 51;
s3, placing the negative pole piece to be processed on a station of the gravure printing equipment, so that the negative pole thinning area 51 corresponds to the nicking area 11;
s4, transferring the slurry prepared in step S1 to a trough of the scored region 11, and starting the gravure printing device to print the negative electrode thinning region 51 to form the negative electrode slurry layer.
Gravure printing is a well-established technique in the art, and the specific operations are as follows: the whole surface of the printing plate is coated with ink, then the blank part of the ink is removed by a special ink scraping mechanism, so that the ink is only left in the cells of the image-text part, and then the ink is transferred to the surface of a printing stock under the action of larger pressure to obtain a printed matter. What structure the operation needs to be equipped with is clear to the person skilled in the art and generally requires a plate cylinder 1, an impression cylinder 2, a doctor blade 4, etc. When the device is used, the correction device is required to assist in order to ensure that a printing area is within a required range; or rolling the pole piece after the conventional coating of the pole piece is finished, and connecting the pole piece roll with a preset belt for printing and then rolling when in use.
Specifically, in step S4, after printing, drying is performed at 80 to 120 ℃, and the drying temperature may be 80 ℃ or 100 ℃ or 120 ℃.
Preferably, the width of the negative electrode slurry layer is 5mm to 10mm, and specifically, may be 5mm, 7mm or 10 mm. The specific width may be determined according to the width of the cathode thinning-out region 51 during actual machining.
Preferably, the negative electrode slurry layer is graphite slurry.
Example two
Referring to fig. 2 and 3, the gravure printing apparatus provided in this embodiment includes a plate cylinder 1 and an impression cylinder 2.
The printing plate roller 1 is characterized in that a plurality of grooves are uniformly distributed on the circumferential surface of part of shaft sections along the circumferential direction to form a nick area 11; the circumferential surface of the remaining part of the shaft section is a smooth surface and is used for pressing other parts of the pole piece to remove the thinning area. The shape of the groove is not limited, and the groove can be a strip-shaped groove, a circular groove, a triangular groove or other common groove shapes, and the surface density of the negative electrode thinning region 51 can be increased as long as the groove shapes are uniformly distributed no matter which groove shape is adopted. Preferably, the groove is a strip-shaped groove, and the length direction of the strip-shaped groove is parallel to the axial direction of the printing plate roller 1.
And the impression roller 2 is axially parallel to the printing plate roller 1 and axially corresponds to the printing plate roller 1, and the impression roller 2 is suitable for being connected with the printing plate roller 1 to finish printing.
The gravure printing equipment of this embodiment can roll in the whole of pole piece, not only cuts the region, can avoid like this because the pole piece that the atress inequality leads to warp.
As a further improvement of the above technical solution, the printing plate cylinder 1 is located below the impression cylinder 2, and further comprises a slurry box 3, the upper end of which is open and is adapted to contain slurry; the lower part of the printing plate roller 1 is arranged in the slurry box 3. When the automatic printing machine is used, partial grooves of the printing plate roller 1 can be immersed in the slurry, and the slurry can automatically fill the grooves of the printing plate roller 1 due to viscosity, so that the automatic printing machine is more convenient to use. Specifically, the slurry may be sucked by a vacuum pump to a transfer location, i.e., a container for storing the slurry, and then flows into the slurry box 3.
As a further improvement of the above technical solution, the printing plate cylinder further comprises a scraper 4 fixed relative to the slurry box 3 and adapted to scrape off the slurry protruding from the circumferential surface of the printing plate cylinder 1. Through the device, the size in each groove can be kept basically consistent, and the phenomenon of different printing depths is avoided.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims (10)

1. A preparation process of an electrode of a lithium ion battery is characterized by comprising the following steps:
after the coating is finished and dried, a negative electrode slurry layer is printed or sprayed on the negative electrode thinning area (51), and the thickness of the negative electrode slurry layer is less than 15 mu m.
2. The process for preparing an electrode of a lithium ion battery according to claim 1, wherein the printing is gravure printing and comprises the following steps:
s1, homogenizing the negative electrode slurry to prepare slurry with viscosity less than 1000 mPas to be suitable for gravure printing;
s2, selecting proper gravure printing equipment to enable the width of the scored region (11) to be smaller than or equal to the width of the negative electrode thinning region (51);
s3, placing the negative pole piece to be processed on a station of the gravure printing equipment, so that the negative pole thinning area (51) corresponds to the nicking area (11);
and S4, transferring the slurry prepared in the step S1 to a trough of the scored region (11), starting the gravure printing equipment, and printing the negative electrode thinning region (51) to form the negative electrode slurry layer.
3. The process for preparing an electrode of a lithium ion battery according to claim 2, wherein in step S4, the printing is completed and then drying is performed, wherein the drying temperature is 80 ℃ to 120 ℃.
4. The lithium ion battery electrode preparation process of claim 2, wherein in step S1, the viscosity of the slurry is 100 to 200mPa S.
5. The preparation process of the lithium ion battery electrode according to claim 1, wherein the width of the negative electrode slurry layer is 5mm to 10 mm.
6. The preparation process of the lithium ion battery electrode according to claim 1, wherein the thickness of the negative electrode slurry layer is 4-5 μm.
7. An intaglio printing apparatus, characterized by comprising:
the printing plate roller (1) is characterized in that a plurality of grooves are uniformly distributed on the circumferential surface of a part of shaft section of the printing plate roller along the circumferential direction to form a nick area (11);
the impression roller (2) is axially parallel to the printing plate roller (1) and axially corresponds to the printing plate roller, and the impression roller (2) is suitable for being connected with the printing plate roller (1) to finish printing.
8. Intaglio printing apparatus according to claim 7, wherein said grooves are strip-shaped grooves, the length direction of which is parallel to the axial direction of the plate cylinder (1).
9. Intaglio printing apparatus according to claim 7 or 8, wherein said plate cylinder (1) is located below said impression cylinder (2), further comprising:
a slurry box (3) which is open at the upper end and is suitable for containing slurry;
the lower part of the printing plate roller (1) is arranged in the pulp box (3).
10. The intaglio printing apparatus according to claim 9, further comprising:
and the scraper (4) is fixed relative to the pulp box (3) and is suitable for scraping off the pulp protruding out of the circumferential surface of the printing plate roller (1).
CN202111328089.0A 2021-11-10 2021-11-10 Lithium ion battery electrode preparation process and gravure printing equipment Pending CN114039025A (en)

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Application Number Priority Date Filing Date Title
CN202111328089.0A CN114039025A (en) 2021-11-10 2021-11-10 Lithium ion battery electrode preparation process and gravure printing equipment

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Application Number Priority Date Filing Date Title
CN202111328089.0A CN114039025A (en) 2021-11-10 2021-11-10 Lithium ion battery electrode preparation process and gravure printing equipment

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103129103A (en) * 2011-11-30 2013-06-05 三星电机株式会社 Gravure printing apparatus
CN110635106A (en) * 2019-10-23 2019-12-31 珠海格力电器股份有限公司 Pole piece, lithium ion battery and manufacturing method of pole piece
CN111969214A (en) * 2020-08-19 2020-11-20 珠海冠宇电池股份有限公司 Positive plate with special-shaped structure and lithium ion battery comprising same
CN112086621A (en) * 2020-09-29 2020-12-15 珠海冠宇电池股份有限公司 Negative plate and laminated lithium ion battery comprising same
CN214411250U (en) * 2020-12-07 2021-10-15 东莞塔菲尔新能源科技有限公司 Negative pole piece and battery

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103129103A (en) * 2011-11-30 2013-06-05 三星电机株式会社 Gravure printing apparatus
CN110635106A (en) * 2019-10-23 2019-12-31 珠海格力电器股份有限公司 Pole piece, lithium ion battery and manufacturing method of pole piece
CN111969214A (en) * 2020-08-19 2020-11-20 珠海冠宇电池股份有限公司 Positive plate with special-shaped structure and lithium ion battery comprising same
CN112086621A (en) * 2020-09-29 2020-12-15 珠海冠宇电池股份有限公司 Negative plate and laminated lithium ion battery comprising same
CN214411250U (en) * 2020-12-07 2021-10-15 东莞塔菲尔新能源科技有限公司 Negative pole piece and battery

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Application publication date: 20220211