CN109585782B - Method for simultaneously producing multiple types of lithium ion battery pole pieces and extrusion coating device - Google Patents
Method for simultaneously producing multiple types of lithium ion battery pole pieces and extrusion coating device Download PDFInfo
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- CN109585782B CN109585782B CN201811204321.8A CN201811204321A CN109585782B CN 109585782 B CN109585782 B CN 109585782B CN 201811204321 A CN201811204321 A CN 201811204321A CN 109585782 B CN109585782 B CN 109585782B
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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
- 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
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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
- H01M4/0409—Methods of deposition of the material by a doctor blade method, slip-casting or roller coating
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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
- H01M4/0411—Methods of deposition of the material by extrusion
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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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Abstract
The invention relates to a method for simultaneously producing lithium ion battery pole pieces of various models and an extrusion coating device. The method comprises the following steps: 1) coating the coating slurry on a current collector at the same time and at intervals according to different coating width requirements of battery pole pieces of different models, drying and rolling after coating, forming at least two coating belts arranged at intervals along a direction vertical to the coating direction on the current collector, and forming a middle blank area between every two adjacent coating belts; 2) and cutting the middle blank area along the coating direction to obtain pole belts for preparing battery pole pieces of different models, and cutting the pole belts to respectively obtain the battery pole pieces of different models. According to the method, coating belts with different coating widths are formed on a current collector by using an asymmetric zebra coating method, so that the production of at least two different types of battery pole pieces is realized on one production line, the production efficiency of the battery pole pieces with different types is improved, and the production flexibility of the coating production line is effectively improved.
Description
Technical Field
The invention belongs to the field of preparation of lithium ion batteries, and particularly relates to a method for simultaneously producing multiple types of lithium ion battery pole pieces and an extrusion coating device.
Background
The lithium ion battery has the advantages of high working voltage, high energy density, small volume, large capacity, long cycle life, no memory effect and the like, and is widely applied to the fields of consumer electronics, power batteries and the like. The coating of the pole piece is an important process in the production of the lithium ion battery, and in recent years, the coating process technology is also developed from a traditional transfer coating (roll coating) mode with a low speed to a high-speed extrusion coating (spray coating) mode.
Chinese patent application publication No. CN106216171A discloses an extrusion coating method, which adjusts the coating width by adjusting the opening size of a die head gasket, and realizes continuous coating of multiple sheets of pole pieces of the same type by symmetrically arranging die head gasket shunting ports, thereby improving the production efficiency of the pole pieces.
The production line of the power battery is high in construction cost, the slurry mixing and coating production line with high automation degree generally needs billions of yuan of investment, meanwhile, the power battery is fast to update, a plurality of new products are eliminated in the market for one year, and the current situation determines that one production line is often required to produce pole pieces with different battery models. When pole pieces of different battery models are produced on the same production line, links such as replacement of die head gaskets, production line debugging and the like are often needed, so that a large number of pole pieces are scrapped, the overall production efficiency is influenced, and the production cost is increased; in summary, the production flexibility of the coating production line of the current lithium ion battery is poor, and the efficient production requirements of pole pieces of different battery models cannot be met.
Disclosure of Invention
The invention aims to provide a method for simultaneously producing lithium ion battery pole pieces of various models, thereby solving the problem of poor production flexibility of the existing method.
The invention also provides an extrusion coating device for producing the lithium ion battery pole pieces of various models, which solves the problem that the existing extrusion coating device can not realize that one production line can simultaneously produce the battery pole pieces of various models.
In order to achieve the purpose, the technical scheme of the method for simultaneously producing the pole pieces of the lithium ion batteries with various models is as follows:
a method for simultaneously producing lithium ion battery pole pieces of various models comprises the following steps:
1) coating the coating slurry on a current collector at the same time and at intervals according to different coating width requirements of battery pole pieces of different models, drying and rolling after coating, forming at least two coating belts arranged at intervals along a direction vertical to the coating direction on the current collector, and forming a middle blank area between every two adjacent coating belts;
2) and cutting the middle blank area along the coating direction to obtain pole belts for preparing battery pole pieces of different models, and cutting the pole belts to respectively obtain the battery pole pieces of different models.
According to the method for simultaneously producing the lithium ion battery pole pieces of various models, the coating belts with different coating widths are formed on the current collector by using an asymmetric zebra coating method, the different coating belts correspond to the coating width requirements of the battery pole pieces of different models, so that the production of at least two battery pole pieces of different models is realized on one production line, the production efficiency of the battery pole pieces of different models is improved, and the production flexibility of the coating production line is effectively improved.
After obtaining the electrode belt, the tab generally needs to be cut from the margin area, and in order to further simplify the cutting process and facilitate the cutting and trimming of the tab, preferably, in step 1), the width of the middle margin area is the sum of the designed margin widths of the two corresponding types of battery pole pieces.
The electrode slurry of the battery pole pieces of different models can be the same or different, and in order to simplify the requirements on extrusion coating equipment, the coating slurry for preparing the lithium ion battery pole pieces of various models is preferably consistent, and the surface density requirements of the lithium ion battery pole pieces of various models are consistent.
The extrusion coating device for simultaneously producing the lithium ion battery pole pieces of various models adopts the technical scheme that:
an extrusion coating device for simultaneously producing various types of lithium ion battery pole pieces comprises an upper die head, a lower die head and a die head gasket positioned between the upper die head and the lower die head, wherein a coating slurry accommodating cavity is defined by the upper die head, the lower die head and the die head gasket, and a feed inlet for introducing coating slurry into the coating slurry accommodating cavity is formed in the extrusion coating device; the die head gasket comprises a left side gasket, a right side gasket and a shunting gasket positioned between the left side gasket and the right side gasket, a left side shunting port is formed between the left side surface of the shunting gasket and the right side surface of the left side gasket, a right side shunting port is formed between the right side surface of the shunting gasket and the left side surface of the right side gasket, a left side discharging port and a right side discharging port are respectively formed between the left side shunting port and the right side shunting port and corresponding parts of the upper die head and the lower die head, and the discharging widths of the left side discharging port and the right side discharging port along the direction perpendicular to the coating direction are not equal;
or the die head gasket comprises a left side gasket, a right side gasket and at least two shunting gaskets positioned between the left side gasket and the right side gasket, and gasket shunting ports are respectively formed between opposite side surfaces of adjacent shunting gaskets and between corresponding side surfaces of the shunting gaskets at edge positions and corresponding side surfaces of the corresponding side gaskets; a die head discharge port is formed between the gasket shunting port and the corresponding parts of the upper die head and the lower die head; at least two die heads have different discharge widths along the direction perpendicular to the coating direction.
According to the extrusion coating device for simultaneously producing the lithium ion battery pole pieces of various models, the die head gaskets with the inconsistent width of the shunting ports are matched with the upper die head and the lower die head, so that the asymmetric zebra-type coating with different coating width properties is realized, the simultaneous and interval coating of the battery pole pieces of different models (with different coating width requirements) can be realized on the same current collector, the production flexibility of a coating production line can be effectively improved, and the efficient preparation of the battery pole pieces of different models is realized.
Drawings
FIG. 1 is a schematic structural view of an extrusion coating apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a die shim according to an embodiment of the present invention;
FIG. 3 is an enlarged view of a chamfer structure on a die shim according to an embodiment of the present invention;
in the figure, 1-lower die, 2-die shim, 20-left side shim, 200-chamfer, 21-right side shim, 22-shunt shim, 3-feed pipe, 4-current collector.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
The embodiment of the extrusion coating device for simultaneously producing the lithium ion battery pole pieces of various models comprises an upper die head (not shown in the figures), a lower die head 1 and a die head gasket 2 arranged between the upper die head and the lower die head 1, wherein the upper die head, the lower die head 1 and the die head gasket 2 enclose a coating slurry accommodating cavity, and a feeding pipe 3 for feeding the coating slurry into the coating slurry accommodating cavity is arranged on the lower die head 1.
Die head gasket 2 includes left side portion gasket 20, right side portion gasket 21 and the discharge width who is located left side portion gasket 20, reposition of redundant personnel gasket 22 between right side portion gasket 21, form left side diffluence pass between the left surface of reposition of redundant personnel gasket 22 and the right flank of left side portion gasket 20, form right side diffluence pass between the right flank of reposition of redundant personnel gasket 22 and the left surface of right side portion gasket 21, diffluence pass width d1 of left side diffluence pass is unequal with diffluence pass width d2 of right side diffluence pass, left side diffluence pass, right side diffluence pass and last die head, form the left side discharge gate between the corresponding position of lower die head 1 respectively, the right side discharge gate, the left side discharge gate, the discharge width of right side discharge gate along the perpendicular to coating direction is unequal.
The left and right side gaskets 20 and 21 include vertical edges extending in the front-rear direction and transverse edges inward turned in the opposite direction at the front ends of the vertical edges, and the shunting gasket 22 has a strip-shaped structure extending in the front-rear direction and has a width d3 in the left-right direction. The front end of the right side of the left side gasket 20 is provided with a chamfer 200, and the front ends of the left side and the right side of the shunt gasket 22 and the left side of the right side gasket 21 are provided with chamfers 200.
When the extrusion coating device of the embodiment works, slurry enters the coating slurry accommodating cavity through the feeding pipe 3 along the direction shown by an arrow, the back roll is correspondingly arranged at the discharge port of the die head, the current collector 4 bypasses the back roll through the gap between the back roll and the die head to move in one direction, the slurry is extruded to the surface of the current collector 4 through the discharge port of the die head, and asymmetric zebra coating with inconsistent left coating width L1 and right coating width L2 is formed on the surface of the current collector 4.
The asymmetric zebra coating can be used for manufacturing battery pole pieces of different models, and in fig. 1, S1, S2 and S are respectively a left blank width, a right blank width and a middle blank width formed on the current collector 4 by the asymmetric zebra coating.
On the basis of the simultaneous production of the battery pole pieces with the two different models, the production of the battery pole pieces with the three or more different models can be realized by increasing the number of the shunting gaskets 22, or the efficient production of the battery pole pieces with the two different models can be realized by adjusting two discharging widths of the discharging holes of the three die heads to be consistent and the other discharging width to be inconsistent with the other two discharging widths.
In the embodiment 1 of the method for simultaneously producing the lithium ion battery pole pieces with various models, the battery pole pieces with the battery models 1 and 2 are simultaneously produced, the coating slurry and the surface density of the two battery pole pieces are consistent, and the following steps are adopted:
1) 95 parts by mass of active material, 2 parts by mass of conductive agent, 3 parts by mass of binder and 167 parts by mass of solvent are added into a homogenizer to be stirred and mixed, and coating slurry with uniform property is prepared.
2) The coating slurry is coated on a current collector 4 by using the extrusion coating device of the above embodiment, and after drying and rolling, first coating belts and second coating belts which are arranged at intervals along the coating direction are formed on the current collector 4, the first coating belts and the second coating belts extend along the coating direction, the coating widths of the first coating belts and the second coating belts are unequal, the coating widths of the first coating belts and the second coating belts correspond to the coating width requirements of the battery model 1 and the battery model 2 respectively, and a middle blank area is formed between the first coating belts and the second coating belts.
3) And cutting the middle blank area along the coating direction to obtain pole belts for preparing battery pole pieces of different models, and respectively cutting and trimming the different pole belts to obtain pole pieces corresponding to the battery model 1 and the battery model 2.
In the embodiment 2 of the method for simultaneously producing the lithium ion battery pole pieces of various models, the battery pole pieces of the battery model 1 and the battery model 3 are simultaneously produced, the coating slurry and the surface density of the two battery pole pieces are consistent, and the preparation is carried out by referring to the method in the embodiment 1.
Comparative example
The preparation method of the battery pole piece of the comparative example comprises the following steps:
1) 95 parts by mass of active material, 2 parts by mass of conductive agent, 3 parts by mass of binder and 167 parts by mass of solvent are added into a homogenizer to be stirred and mixed, and coating slurry with uniform property is prepared.
2) And symmetrically coating the die head gasket with the same width of the left shunting port and the right shunting port, drying and rolling, and cutting the middle white area along the coating direction to obtain two pole belts suitable for producing pole pieces of the battery model 1.
The die shim dimensions for the processes of examples 1 and 2 and for the comparative example are shown in table 1.
TABLE 1 die shim dimensions to which examples and comparative examples relate
| Numbering | d1/mm | d2/mm | d3/mm |
| Comparative example | 367.5 | 367.5 | 57.5 |
| Example 1 | 367.5 | 283.5 | 56.5 |
| Example 2 | 367.5 | 343.5 | 49.5 |
The design parameters of battery type 1, battery type 2, and battery type 3 are shown in table 2.
TABLE 2 design parameters for different cell types
The measured coating margin size data for the comparative examples and examples are shown in table 3.
TABLE 3 measured coating white size data for comparative examples and examples
Measuring the coating area and the size of the blank of the coated pole piece by using a steel plate ruler with the precision of 0.5 mm; using a circular sampler with a diameter of 25mm, 3 specimens were taken from each coated strip, and the areal density was calculated. The areal density data for the pole pieces obtained by the methods of comparative and example are shown in table 4.
TABLE 4 measured areal density data for comparative examples and examples
As can be seen from the above table, the dimensions and the areal density data of the pole pieces of the examples are within the tolerance of the design requirements, and the areal density uniformity of the pole pieces of the examples is at the same level as the comparative examples, which indicates that the same coating effect as the symmetric zebra coating form can be obtained by the asymmetric zebra coating form. However, the method of the embodiment avoids links such as replacement and processing of the die head gasket and debugging of the production line during production of battery pole pieces of different models, realizes simultaneous production of multiple types of battery pole pieces by one production line, greatly reduces production cost, improves production efficiency, and improves production flexibility of a coating production line.
Claims (1)
1. The extrusion coating device for simultaneously producing the lithium ion battery pole pieces of various models comprises an upper die head and a lower die head, and is characterized by further comprising a die head gasket positioned between the upper die head and the lower die head, wherein the upper die head, the lower die head and the die head gasket enclose a coating slurry containing cavity; the die head gasket comprises a left side gasket, a right side gasket and a shunting gasket positioned between the left side gasket and the right side gasket, a left side shunting port is formed between the left side surface of the shunting gasket and the right side surface of the left side gasket, a right side shunting port is formed between the right side surface of the shunting gasket and the left side surface of the right side gasket, a left side discharging port and a right side discharging port are respectively formed between the left side shunting port and the right side shunting port and corresponding parts of the upper die head and the lower die head, and the discharging widths of the left side discharging port and the right side discharging port along the direction perpendicular to the coating direction are not equal;
or the die head gasket comprises a left side gasket, a right side gasket and at least two shunting gaskets positioned between the left side gasket and the right side gasket, and gasket shunting ports are respectively formed between opposite side surfaces of adjacent shunting gaskets and between corresponding side surfaces of the shunting gaskets at edge positions and corresponding side surfaces of the corresponding side gaskets; a die head discharge port is formed between the gasket shunting port and the corresponding parts of the upper die head and the lower die head; at least two die head discharge holes have unequal discharge widths in the direction perpendicular to the coating direction;
the use method of the extrusion coating device for simultaneously producing the lithium ion battery pole pieces of various models comprises the following steps:
1) coating the coating slurry on a current collector at the same time and at intervals according to different coating width requirements of battery pole pieces of different models, drying and rolling after coating, forming at least two coating belts arranged at intervals along a direction vertical to the coating direction on the current collector, and forming a middle blank area between every two adjacent coating belts;
2) and cutting the middle blank area along the coating direction to obtain pole belts for preparing battery pole pieces of different models, and cutting the pole belts to respectively obtain the battery pole pieces of different models.
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| CN110302942B (en) * | 2019-07-17 | 2024-05-24 | 宁波维科电池有限公司 | Coating die head for single or multiple groups of lithium battery pole pieces |
| CN111477833B (en) * | 2020-04-10 | 2023-04-18 | 孚能科技(赣州)股份有限公司 | Lithium ion battery pole piece and laser cutting and manufacturing method thereof |
| CN112635704A (en) * | 2020-12-28 | 2021-04-09 | 蜂巢能源科技有限公司 | Pole piece and pole piece coating method |
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| CN106216171A (en) * | 2016-08-31 | 2016-12-14 | 中航锂电（洛阳）有限公司 | A kind of extrusion coating machine die head pad, extrusion die and extrusion coating machine |
| CN108028353A (en) * | 2016-06-13 | 2018-05-11 | 株式会社Lg化学 | For manufacturing the apparatus and method of electrode |
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| CN101157076A (en) * | 2007-11-14 | 2008-04-09 | 中国乐凯胶片集团公司 | A pole piece coating method and coating nozzle |
| KR101699944B1 (en) * | 2013-09-30 | 2017-01-25 | 주식회사 엘지화학 | Active material coating equipment and Active material distributor applied for the same |
| CN207385819U (en) * | 2017-08-24 | 2018-05-22 | 宁德时代新能源科技股份有限公司 | Apparatus for coating |
| CN207521248U (en) * | 2017-11-21 | 2018-06-22 | 宁德时代新能源科技股份有限公司 | It is coated with gasket and apparatus for coating |
| CN108126867A (en) * | 2018-01-31 | 2018-06-08 | 河南国能电池有限公司 | Coating machine gasket and coating machine |
| CN108565387A (en) * | 2018-03-21 | 2018-09-21 | 中航锂电技术研究院有限公司 | A kind of lithium ion battery cell lug laser formation technique |
| CN108480138B (en) * | 2018-05-29 | 2024-06-21 | 利信(江苏)能源科技有限责任公司 | Extrusion coating machine die head gasket and die head with uniform coating |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108028353A (en) * | 2016-06-13 | 2018-05-11 | 株式会社Lg化学 | For manufacturing the apparatus and method of electrode |
| CN106216171A (en) * | 2016-08-31 | 2016-12-14 | 中航锂电（洛阳）有限公司 | A kind of extrusion coating machine die head pad, extrusion die and extrusion coating machine |
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