CN112701251A - Rolling method of lithium ion battery negative plate - Google Patents
Rolling method of lithium ion battery negative plate Download PDFInfo
- Publication number
- CN112701251A CN112701251A CN201911008811.5A CN201911008811A CN112701251A CN 112701251 A CN112701251 A CN 112701251A CN 201911008811 A CN201911008811 A CN 201911008811A CN 112701251 A CN112701251 A CN 112701251A
- Authority
- CN
- China
- Prior art keywords
- pole piece
- rolling
- negative pole
- lithium ion
- pressing roller
- Prior art date
- 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.)
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Classifications
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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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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
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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
- H01M4/0471—Processes of manufacture in general involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis
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- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention discloses a rolling method of a lithium ion battery negative plate, which comprises the following steps: drying the coated negative pole piece to obtain an initial negative pole piece; then rolling the initial negative pole piece by a hot-pressing roller to obtain a primary rolled negative pole piece; baking the primary rolled negative pole piece; and then rolling the pole piece through a cold pressing roller, and directly rolling to the target thickness to obtain the required negative pole piece. The invention can effectively improve the rebound of the negative pole piece, improve the consistency of the surface density and the thickness of the pole piece, prevent the deformation of the service life of the battery core, improve the uniformity of the porosity of the pole piece, improve the liquid absorption capacity of the pole piece and improve the electrochemical performance of the battery.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a rolling method of a lithium ion battery negative plate.
Background
The lithium ion battery has been widely applied to the 3C consumer market and the field of new energy automobiles due to the advantages of high energy density and output voltage, long service life, no memory effect and environmental protection. The preparation of the lithium ion battery needs a plurality of processes, wherein pole piece rolling is an indispensable process. The pole piece reaches a certain compacted density after being rolled, and is very important for improving the energy density of the lithium ion battery. At present, the positive pole piece is rolled for one time, and the positive pole piece is easy to be brittle because of multiple rolling; the negative pole generally rolls for once, but also has through the secondary and rolls, and later stage is easy to bounce back and leads to electric core to warp, increases electric core thickness, influences the use. Based on the above disadvantages, a suitable rolling method is needed to improve the rebound of the negative pole piece, and to improve the consistency of the surface density and thickness of the pole piece and the uniformity of the porosity.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a rolling method of a lithium ion battery negative pole piece, aiming at improving the rebound of the negative pole piece, improving the consistency of the surface density and the thickness of the pole piece, preventing the deformation of a battery core during the service life, improving the uniformity of the porosity of the pole piece, improving the liquid absorption capacity of the pole piece and improving the electrochemical performance of the battery.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a rolling method for a lithium ion battery negative plate comprises the following steps:
s1: drying the coated negative pole piece to obtain an initial negative pole piece;
s2: rolling the initial negative pole piece in the step S1 by a hot-pressing roller to obtain a primary rolled negative pole piece;
s3: baking the primary rolled negative pole piece prepared in the step S2;
s4: and (5) rolling the pole piece in the S3 by a cold-pressing roller, and directly rolling to the target thickness to obtain the required negative pole piece.
The thickness of the negative pole piece rolled once is 140-180% of the target thickness of the pole piece. Further, the thickness of the negative pole piece rolled once is 150-170% of the target thickness of the pole piece.
The rolling temperature of the hot pressing roller is 70-100 ℃. Further, the rolling temperature of the hot pressing roller is 70-90 ℃.
The baking temperature of the once-rolling negative pole piece is 70-120 ℃. Further, the baking temperature of the negative pole piece subjected to primary rolling is 70-100 ℃.
The baking time of the negative pole piece subjected to primary rolling is 4-12 hours. Further, the baking time of the negative pole piece subjected to primary rolling is 4-10 hours.
The rolling speed of the hot-pressing roller is 20-50 m/min. Further, the rolling speed of the hot-pressing roller is 20-40 m/min.
The rolling speed of the cold pressing roller is 10-30 m/min. Further, the rolling speed of the cold pressing roller is 10-20 m/min.
The invention has the beneficial effects that:
(1) according to the invention, firstly, the pole piece is rolled to 150-170% of the target thickness through high-speed hot pressing, so that the rebound of the rolled material of the pole piece can be effectively improved, meanwhile, the moisture in the pole piece can be removed at high temperature, meanwhile, the material of the pole piece is in a molten state in the heating process, the adhesive force between an active substance and fluid is increased, and the adverse effect of the release influence of the internal stress of the pole piece is reduced;
(2) the invention is baked after primary rolling, further removes the moisture in the pole piece, and simultaneously enables the pole piece to be fully rebounded in a high-temperature environment, thereby reducing the thickness rebound of the pole piece in the subsequent production and processing process and improving the surface density and the thickness consistency of the pole piece;
(3) the secondary rolling is performed by using a cold pressing roller, so that the pole piece is further rolled to the target thickness, and the deformation resistance of the battery pole piece is reduced;
(4) the invention can effectively improve the rebound of the pole piece, improve the uniformity of the porosity of the pole piece, improve the liquid absorption capacity of the pole piece and improve the electrochemical performance of the battery.
Detailed Description
The present invention is described in detail below with reference to specific embodiments, and the description in this section is only exemplary and explanatory and should not be construed as limiting the scope of the present invention in any way.
A rolling method for a lithium ion battery negative plate comprises the following steps:
s1: drying the coated negative pole piece to obtain an initial negative pole piece;
s2: rolling the initial negative pole piece in the step S1 by a hot-pressing roller to obtain a primary rolled negative pole piece;
s3: baking the primary rolled negative pole piece prepared in the step S2;
s4: and (5) rolling the pole piece in the S3 by a cold-pressing roller, and directly rolling to the target thickness to obtain the required negative pole piece.
The thickness of the negative pole piece rolled once is 140-180% of the target thickness of the pole piece.
The rolling temperature of the hot pressing roller is 70-100 ℃.
The baking temperature of the once-rolling negative pole piece is 70-120 ℃.
The baking time of the negative pole piece subjected to primary rolling is 4-12 hours.
The rolling speed of the hot-pressing roller is 20-50 m/min.
The rolling speed of the cold pressing roller is 10-30 m/min.
Example 1:
s1: drying the coated negative pole piece to obtain an initial negative pole piece;
s2: heating a hot-pressing roller to 80 ℃, and then rolling the initial negative pole piece in S1 at the speed of 30m/min by the hot-pressing roller, wherein the rolling thickness is 150% of the target thickness, so as to obtain a primary rolled negative pole piece;
s3: baking the primary rolled negative pole piece prepared by the step S2 at 95 ℃ for 4 h;
s4: and (5) rolling the pole piece in the S3 at the speed of 15m/min by using a cold-pressing roller, and directly rolling to the target thickness to obtain the required negative pole piece.
Example 2:
s1: drying the coated negative pole piece to obtain an initial negative pole piece;
s2: heating the hot-pressing roller to 80 ℃, and then rolling the initial negative pole piece in the step S1 at the speed of 30m/min by the hot-pressing roller, wherein the rolling thickness is 170% of the target thickness, so as to obtain a primary rolled negative pole piece;
s3: baking the primary rolled negative pole piece prepared by the step S2 at 95 ℃ for 4 h;
s4: and (5) rolling the pole piece in the S3 at the speed of 15m/min by using a cold-pressing roller, and directly rolling to the target thickness to obtain the required negative pole piece.
Example 3:
s1: drying the coated negative pole piece to obtain an initial negative pole piece;
s2: heating a hot-pressing roller to 80 ℃, and then rolling the initial negative pole piece in S1 at the speed of 30m/min by the hot-pressing roller, wherein the rolling thickness is 150% of the target thickness, so as to obtain a primary rolled negative pole piece;
s3: baking the primary rolled negative pole piece prepared by the step S2 at 95 ℃ for 8 h;
s4: and (5) rolling the pole piece in the S3 at the speed of 15m/min by using a cold-pressing roller, and directly rolling to the target thickness to obtain the required negative pole piece.
Comparative example 1:
s1: drying the coated negative pole piece to obtain an initial negative pole piece;
s2: heating a hot-pressing roller to 80 ℃, and then rolling the initial negative pole piece in S1 at the speed of 30m/min by the hot-pressing roller, wherein the rolling thickness is 150% of the target thickness, so as to obtain a primary rolled negative pole piece;
s3: and then rolling the pole piece in the S3 at the speed of 15m/min by a cold-pressing roller, and directly rolling to the target thickness to obtain the required negative pole piece.
Comparative example 2:
s1: drying the coated negative pole piece to obtain an initial negative pole piece;
s2: and heating the hot-pressing roller to 80 ℃, and then rolling the initial negative pole piece in the step S1 to a target thickness through the hot-pressing roller at the speed of 30m/min to obtain the required negative pole piece.
Comparative example 3:
s1: drying the coated negative pole piece to obtain an initial negative pole piece;
s2: and (5) rolling the initial negative pole piece at the speed of 15m/min in the step (S1) to the target thickness through a cold pressing roller to obtain the required negative pole piece.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any minor modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the technical scope of the present invention.
Claims (7)
1. The rolling method for the lithium ion battery negative plate is characterized by comprising the following steps:
s1: drying the coated negative pole piece to obtain an initial negative pole piece;
s2: rolling the initial negative pole piece in the step S1 by a hot-pressing roller to obtain a primary rolled negative pole piece;
s3: baking the primary rolled negative pole piece prepared in the step S2;
s4: and (5) rolling the pole piece in the S3 by a cold-pressing roller, and directly rolling to the target thickness to obtain the required negative pole piece.
2. The rolling method of the lithium ion battery negative electrode sheet according to claim 1, wherein the thickness of the negative electrode sheet rolled at one time is 140-180% of the target thickness of the sheet.
3. The rolling method of the lithium ion battery negative electrode sheet according to claim 1, wherein the rolling temperature of the hot-pressing roller is 70-100 ℃.
4. The rolling method of the lithium ion battery negative electrode sheet according to claim 1, wherein the baking temperature of the primary rolling negative electrode sheet is 70-120 ℃.
5. The rolling method of the lithium ion battery negative electrode sheet according to claim 1, wherein the baking time of the negative electrode sheet rolled at one time is 4-12 h.
6. The rolling method of the lithium ion battery negative electrode sheet according to claim 1, wherein the rolling speed of the hot press roller is 20-50 m/min.
7. The rolling method of the lithium ion battery negative electrode sheet according to claim 1, wherein the rolling speed of the cold pressing roller is 10-30 m/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911008811.5A CN112701251A (en) | 2019-10-23 | 2019-10-23 | Rolling method of lithium ion battery negative plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911008811.5A CN112701251A (en) | 2019-10-23 | 2019-10-23 | Rolling method of lithium ion battery negative plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112701251A true CN112701251A (en) | 2021-04-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911008811.5A Withdrawn CN112701251A (en) | 2019-10-23 | 2019-10-23 | Rolling method of lithium ion battery negative plate |
Country Status (1)
| Country | Link |
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| CN (1) | CN112701251A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113904001A (en) * | 2021-09-27 | 2022-01-07 | 合肥国轩高科动力能源有限公司 | Method for processing lithium ion battery roll core |
| CN114535295A (en) * | 2021-12-22 | 2022-05-27 | 捷威动力工业嘉兴有限公司 | Rolling equipment and rolling process for positive and negative electrode plates |
-
2019
- 2019-10-23 CN CN201911008811.5A patent/CN112701251A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113904001A (en) * | 2021-09-27 | 2022-01-07 | 合肥国轩高科动力能源有限公司 | Method for processing lithium ion battery roll core |
| CN114535295A (en) * | 2021-12-22 | 2022-05-27 | 捷威动力工业嘉兴有限公司 | Rolling equipment and rolling process for positive and negative electrode plates |
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Application publication date: 20210423 |
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| WW01 | Invention patent application withdrawn after publication |