CN112216820A - Method for improving rolling rebound of pole piece and rolling device - Google Patents
Method for improving rolling rebound of pole piece and rolling device Download PDFInfo
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- CN112216820A CN112216820A CN202010862573.0A CN202010862573A CN112216820A CN 112216820 A CN112216820 A CN 112216820A CN 202010862573 A CN202010862573 A CN 202010862573A CN 112216820 A CN112216820 A CN 112216820A
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- rolling
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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
-
- 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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- 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 discloses a method and a rolling device for improving rolling rebound of a pole piece, and relates to the technical field of lithium battery pole piece processing, wherein the method comprises the steps of firstly adopting large rolling reduction and then adopting small rolling reduction to carry out multi-pass continuous rolling on the pole piece; wherein the rolling times of large rolling reduction are more than or equal to 3 times, the large rolling reduction is 15-30%, the rolling times of small rolling reduction are more than or equal to 1 time, and the small rolling reduction is 4-6%; the reduction is gradually decreased in the whole rolling process, and the intermittent temperature rolling is carried out on the pole piece by combining hot rolling and normal temperature rolling during large-reduction rolling. According to the invention, through multi-pass rolling with different rolling reduction, the stress concentration of the pole piece is greatly reduced, the thickness rebound of the pole piece is improved, the material particle crushing caused by overlarge rolling reduction is avoided, meanwhile, the risks of crumpling, belt breakage and the like of the current collector can be improved, the thickness of a material area tends to be consistent, and the consistency of the pole piece is further improved.
Description
Technical Field
The invention relates to the technical field of lithium battery pole piece processing, in particular to a method and a rolling device for improving rolling rebound of a pole piece.
Background
Along with the gradual improvement of the energy density of the lithium ion battery, lithium battery manufacturers can install more pole pieces in a limited shell volume by improving the compaction density of the pole pieces, so that the aim of improving the energy density of a battery core is fulfilled.
During the coating process of the slurry, due to the difference of the rheological stress and the boundary conditions of the slurry on the current collector, the thickness of the slurry in the area of the edge of the current collector area is smaller than that of the slurry in the rest area of the pole piece. The thickness of the pole piece area is uneven, the compaction density of each area is different in the rolling process, the pole piece is rolled at one time at normal temperature in the current market, although the pole piece can reach the set thickness in a short time, the material area has larger concentrated stress due to the large rolling reduction of one time, the rebound of the pole piece is larger, the phenomenon that the middle of the pole piece is thick and the two sides of the pole piece are thin is aggravated due to one time of rolling, the inconsistency of the compaction density of different areas of the pole piece is caused, the consistency of the thickness of the battery core is influenced, and even the consistency of the electrical performance of the battery is influenced.
Patent CN202423449 relates to two times of rolling to disperse the primary large deformation of the pole piece into two times of small compression deformation, thereby achieving the purpose of restraining the rebound of the thickness of the pole piece. However, the two-time rolling still has larger compression deformation, and meanwhile, larger concentrated stress exists in the pole piece, and the thickness of the pole piece can also have larger rebound due to the existence of the concentrated stress, so that the thickness rebound phenomenon of the pole piece can not be obviously improved.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a method and a rolling device for improving rolling rebound of a pole piece, which are used for rolling the pole piece by adopting a hot rolling and normal temperature rolling alternative mode through multiple passes with different rolling reduction, so that the defect of stress concentration of the rolled pole piece is improved.
The invention provides a method for improving rolling rebound of a pole piece, which comprises the steps of firstly carrying out multi-pass continuous rolling on the pole piece by adopting large rolling reduction and then adopting small rolling reduction; wherein the rolling times of large rolling reduction are more than or equal to 3 times, the large rolling reduction is 15-30%, the rolling times of small rolling reduction are more than or equal to 1 time, and the small rolling reduction is 4-6%; the reduction is gradually decreased in the whole rolling process, and the intermittent temperature rolling is carried out on the pole piece by combining hot rolling and normal temperature rolling during large-reduction rolling.
Preferably, the rolling times of the large rolling reduction are 4 times, and the rolling reductions of the first rolling reduction to the fourth rolling reduction are respectively 30%, 25%, 20% and 15%; the number of times of the small reduction rolling was 2 times, and the reduction of the fifth to sixth rolling was 6% and 4%.
Preferably, the first rolling to the fourth rolling adopt a roller with a large roller diameter, and the fifth rolling to the sixth rolling adopt a roller with a small roller diameter; wherein the large roll diameter is 3-5 times of the small roll diameter.
Preferably, the rotating speeds of the rollers in each pass are different, the total rolling reduction of the pole piece is set to be s, the thickness of the pole piece before rolling is set to be h, and the rotating speed of the roller for the first rolling is set to be v1And quantifying according to the equal second flow in the rolling process, then: the rotating speed of the roller for the second rolling is (h-0.3s) v1V (h-0.55s), the rotating speed of the roller for the third rolling is (h-0.3s) v1V (h-0.75s), the rotating speed of the roller for the fourth rolling is (h-0.3s) v1V (h-0.9s), the roller rotating speed of the fifth rolling is (h-0.3s) v1V (h-0.96s), the rotating speed of the roller for the sixth rolling is (h-0.3s) v1/(h-s)。
Preferably, the hot rolling is to heat the roller through a heating coil on the roller, and the temperature of the roller is adjusted to be within the range of 30-85 ℃; preferably, the temperature of the room-temperature rolling is room-temperature.
The invention also provides a rolling device which comprises a first rolling unit with a large roll diameter and a second rolling unit with a small roll diameter, which are sequentially arranged on the production line; the first rolling unit with the large roll diameter comprises at least 3 pairs of large roll diameter rolls which are sequentially arranged, and the second rolling unit with the small roll diameter comprises at least 1 pair of small roll diameter rolls; and a swinging roller capable of freely swinging is arranged between the adjacent rollers.
Preferably, the swing angle of the swing roller is controlled by a computer, and the tension of the pole piece is controlled by the swing angle of the swing roller.
Preferably, a thickness tester is arranged between the first rolling unit with the large roll diameter and the second rolling unit with the small roll diameter and behind the second rolling unit with the small roll diameter.
Has the advantages that: according to the invention, the electrode plate is continuously rolled for multiple times by adopting gradually reduced large rolling reduction, and finally the surface of the electrode plate is rolled and shaped by adopting small rolling reduction, and meanwhile, the alternating mode of hot pressing and normal temperature pressure is combined, so that the stress of a material area is in the continuous releasing process, and the stress concentration of the electrode plate can be better controlled. Compared with the one-time or two-time rolling technology adopted in the prior art, through multi-pass rolling with different rolling reduction, the stress concentration of the pole piece is greatly reduced, the rebound of the thickness of the pole piece is improved, the material particle breakage caused by overlarge rolling reduction is avoided, meanwhile, the risks of crumpling, belt breakage and the like of the current collector can be improved, the thickness of a material area tends to be consistent, and the consistency of the pole piece is further improved.
Drawings
FIG. 1 is a rolling device for improving rolling rebound of a pole piece in example 1 of the present invention; in the figure, 1 is a first roller, 2 is a second roller, 3 is a third roller, 4 is a fourth roller, 5 is a thickness tester, 6 is a fifth roller, 7 is a sixth roller, 8 is a pole piece, and 9 is a swing roller.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to specific examples.
Example 1
A rolling device comprises 6 pairs of rollers which are sequentially arranged on a production line, wherein a first roller 1, a second roller 2, a third roller 3 and a fourth roller 4 are large-diameter rollers, a fifth roller 6 and a sixth roller 7 are small-diameter rollers, a swinging roller 9 capable of freely swinging is arranged between each pair of rollers, and a thickness tester 5 is arranged between the fourth roller 4 and the fifth roller 6 and behind the sixth roller 7.
Setting the rolling reduction of each pass of roller, setting the rotating speed of each pass of roller according to the rolling reduction, and simultaneously setting the temperature of each pass of roller, wherein the temperature of the first roller 1 is 85 ℃, the temperature of the second roller 2 is room temperature, the temperature of the third roller 3 is 85 ℃, the temperature of the fourth roller 4 is room temperature, and the temperatures of the fifth roller 6 and the sixth roller 7 are both room temperature.
The pole piece 8 enters the first roller 1 to be rolled by 30% of rolling reduction, then enters the second roller 2 to be rolled by 25% of rolling reduction, a swinging roller 9 capable of swinging is distributed between the first roller 1 and the second roller 2, the tension of the pole piece between the first roller 1 and the second roller 2 can be adjusted through the swinging angle of the swinging roller 9, and the pole piece is prevented from being wrinkled. When the pole piece passes through the second roller 2 and the third roller 3, the tension of the pole piece 8 is also adjusted through the swing roller 9 between the pole piece and the third roller. After the pole piece 8 enters the fourth roller 4 after being pressed by the hot roller of the third roller 3, the tension of the pole piece 8 is adjusted through the swing roller 9. An on-line thickness gauge 5 is distributed behind the fourth roller 4 to measure the thickness of the pole piece 8. The pole piece 8 enters the fifth roller 6 after thickness measurement, the swing rollers 9 are distributed between the fifth roller 6 and the sixth roller 7, and finally the pole piece 8 enters the online thickness meter 5 after being shaped by the sixth roller 7. According to the invention, the pole piece is rolled by the method, so that the rebound of the pole piece can be well inhibited, and the thickness distribution uniformity of the pole piece can be controlled.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. A method for improving rolling rebound of a pole piece is characterized in that the pole piece is continuously rolled for multiple times by adopting large rolling reduction and then small rolling reduction; wherein the rolling times of large rolling reduction are more than or equal to 3 times, the large rolling reduction is 15-30%, the rolling times of small rolling reduction are more than or equal to 1 time, and the small rolling reduction is 4-6%; the reduction is gradually decreased in the whole rolling process, and the intermittent temperature rolling is carried out on the pole piece by combining hot rolling and normal temperature rolling during large-reduction rolling.
2. The method for improving rolling rebound of the pole piece according to claim 1, wherein the rolling times of the large rolling reduction are 4 times, and the rolling reductions of the first rolling to the fourth rolling are respectively 30%, 25%, 20% and 15%; the number of times of the small reduction rolling was 2 times, and the reduction of the fifth to sixth rolling was 6% and 4%.
3. The method for improving rolling rebound of the pole piece according to claim 2, wherein the first rolling to the fourth rolling use a large-diameter roller, and the fifth rolling to the sixth rolling use a small-diameter roller; wherein the large roll diameter is 3-5 times of the small roll diameter.
4. The method for improving rolling rebound of the pole piece according to claim 2, wherein the rotation speed of each pass of roller is different, the total reduction of the pole piece is set to be s, the thickness of the pole piece before rolling is set to be h, and the rotation speed of the roller for the first rolling is set to be v1And quantifying according to the equal second flow in the rolling process, then: the rotating speed of the roller for the second rolling is (h-0.3s) v1V (h-0.55s), the rotating speed of the roller for the third rolling is (h-0.3s) v1V (h-0.75s), the rotating speed of the roller for the fourth rolling is (h-0.3s) v1V (h-0.9s), the roller rotating speed of the fifth rolling is (h-0.3s) v1V (h-0.96s), the rotating speed of the roller for the sixth rolling is (h-0.3s) v1/(h-s)。
5. The method for improving rolling rebound of the pole piece according to claim 1, wherein the hot rolling is performed by heating the roller through a heating coil on the roller, and the temperature of the roller is adjusted to be 30-85 ℃; preferably, the temperature of the room-temperature rolling is room-temperature.
6. A rolling device for improving rolling rebound of a pole piece is characterized by comprising a first rolling unit with a large roller diameter and a second rolling unit with a small roller diameter, which are sequentially arranged on a production line; the first rolling unit with the large roll diameter comprises at least 3 pairs of large roll diameter rolls which are sequentially arranged, and the second rolling unit with the small roll diameter comprises at least 1 pair of small roll diameter rolls; and a swinging roller capable of freely swinging is arranged between the adjacent rollers.
7. The rolling device for improving rolling rebound of pole pieces according to claim 6, wherein the swing angle of the swing roller is controlled by a computer, and the tension of the pole pieces is controlled by the swing angle of the swing roller.
8. The rolling device for improving rolling rebound of pole pieces as claimed in claim 6, wherein a thickness tester is arranged between the first rolling unit with large roller diameter and the second rolling unit with small roller diameter and behind the second rolling unit with small roller diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010862573.0A CN112216820A (en) | 2020-08-25 | 2020-08-25 | Method for improving rolling rebound of pole piece and rolling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010862573.0A CN112216820A (en) | 2020-08-25 | 2020-08-25 | Method for improving rolling rebound of pole piece and rolling device |
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| Publication Number | Publication Date |
|---|---|
| CN112216820A true CN112216820A (en) | 2021-01-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010862573.0A Pending CN112216820A (en) | 2020-08-25 | 2020-08-25 | Method for improving rolling rebound of pole piece and rolling device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114535934A (en) * | 2022-02-23 | 2022-05-27 | 上海兰钧新能源科技有限公司 | Pole piece rolling method and pole piece |
| CN115084791A (en) * | 2022-06-23 | 2022-09-20 | 万向一二三股份公司 | Manufacturing method of synthetic tab |
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| US20070186609A1 (en) * | 2003-09-04 | 2007-08-16 | Hans-Peter Richter | Method and device for applying an adjustable tensile-stress distribution, in particular in the edge regions of cold-rolled metal strips |
| JP2009245788A (en) * | 2008-03-31 | 2009-10-22 | Hitachi Vehicle Energy Ltd | Roll press device |
| CN202423449U (en) * | 2011-11-30 | 2012-09-05 | 凯迈（江苏）机电有限公司 | Rolling processing equipment for pole piece of lithium battery |
| CN203071167U (en) * | 2013-03-03 | 2013-07-17 | 山东润峰集团新能源科技有限公司 | Roller press for lithium ion battery plate |
| CN203690404U (en) * | 2013-12-31 | 2014-07-02 | 广东凯德能源科技有限公司 | Electrode plate rolling equipment for lithium ion battery |
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| CN107999537A (en) * | 2018-01-17 | 2018-05-08 | 般若涅利（北京）装备技术有限公司 | The device and corresponding method that battery pole piece thickness rebounds after a kind of suppression roll-in |
| CN210489730U (en) * | 2019-06-03 | 2020-05-08 | 恒大新能源科技集团有限公司 | Lithium ion battery negative pole piece roll-in device |
| CN111477834A (en) * | 2020-04-23 | 2020-07-31 | 佛山市金银河智能装备股份有限公司 | Battery pole piece rolling device and method |
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2020
- 2020-08-25 CN CN202010862573.0A patent/CN112216820A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070186609A1 (en) * | 2003-09-04 | 2007-08-16 | Hans-Peter Richter | Method and device for applying an adjustable tensile-stress distribution, in particular in the edge regions of cold-rolled metal strips |
| JP2009245788A (en) * | 2008-03-31 | 2009-10-22 | Hitachi Vehicle Energy Ltd | Roll press device |
| CN202423449U (en) * | 2011-11-30 | 2012-09-05 | 凯迈（江苏）机电有限公司 | Rolling processing equipment for pole piece of lithium battery |
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| CN203690404U (en) * | 2013-12-31 | 2014-07-02 | 广东凯德能源科技有限公司 | Electrode plate rolling equipment for lithium ion battery |
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| CN107999537A (en) * | 2018-01-17 | 2018-05-08 | 般若涅利（北京）装备技术有限公司 | The device and corresponding method that battery pole piece thickness rebounds after a kind of suppression roll-in |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114535934A (en) * | 2022-02-23 | 2022-05-27 | 上海兰钧新能源科技有限公司 | Pole piece rolling method and pole piece |
| CN115084791A (en) * | 2022-06-23 | 2022-09-20 | 万向一二三股份公司 | Manufacturing method of synthetic tab |
| CN115084791B (en) * | 2022-06-23 | 2023-11-03 | 万向一二三股份公司 | Method for manufacturing synthetic electrode lug |
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Application publication date: 20210112 |