CN108649180B - Coating method of lithium ion battery pole piece and lithium ion battery pole piece prepared by coating method - Google Patents
Coating method of lithium ion battery pole piece and lithium ion battery pole piece prepared by coating method Download PDFInfo
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- CN108649180B CN108649180B CN201810413077.XA CN201810413077A CN108649180B CN 108649180 B CN108649180 B CN 108649180B CN 201810413077 A CN201810413077 A CN 201810413077A CN 108649180 B CN108649180 B CN 108649180B
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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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
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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 provides a coating method of a lithium ion battery pole piece and a lithium ion battery pole piece prepared by the coating method, and relates to the technical field of lithium ion batteries. The coating method of the lithium ion battery pole piece is a coating method of the battery pole piece aiming at copper foil with the thickness of 6 microns, the method comprises the steps of firstly conveying slurry and a foil belt to a coating machine for coating, reserving non-coated margins at two sides of the whole foil belt in the longitudinal direction during coating, and then sequentially drying in an oven, rolling and cutting to obtain the lithium ion battery pole piece. The coating method effectively solves the problems that the 6 mu m copper foil is too thin, so that the coating is easy to wrinkle and the curled edge at the blank position is easy to break, and has the advantages of simple and convenient operation, high production qualification rate and high coating precision.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a coating method of a lithium ion battery pole piece and a lithium ion battery pole piece prepared by the coating method.
Background
In recent years, with the continuous development of new energy automobile market, the nation moves back the power battery subsidies and the subsidy threshold is continuously improved. Therefore, in order to meet the requirement of high energy density cells, various large lithium battery manufacturers strive to reach the goal of 300Wh/kg in 2020, and it becomes important to research and develop a single cell of a lithium ion battery with higher energy density.
The existing means for improving the energy density of the lithium ion battery mainly comprise: (1) adopting high-capacity positive and negative active materials; (2) the proportion of active substances in the slurry formula is improved; (3) the consumption of electrolyte is reduced; (4) thinning the thickness of the diaphragm; (5) the weight of other auxiliary materials is reduced, for example, light packaging materials, lugs and other auxiliary materials are used, but the effects of the measures are not obvious, and substantial technical effects are difficult to generate. Therefore, people gradually focus attention on the selection of the copper foil of the battery cell in order to improve the energy density of the lithium ion battery. Although thinner lithium copper foil is more expensive to process and difficult to produce and supply, the use of thinner lithium copper foil to increase the energy density of lithium ion batteries is a big trend at present, and some faucet enterprises have developed corresponding researches such as 9 μm → 8 μm, 8 μm → 6 μm.
Therefore, it is necessary and urgent to develop a coating method for thinner lithium-ion copper foil (6 μm) to avoid the problems of easy wrinkle of coating and easy breakage of edge curl at blank position due to over-thin lithium-ion copper foil.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The first purpose of the invention is to provide a coating method of a lithium ion battery pole piece, which is a coating method of a battery pole piece aiming at a copper foil with the thickness of 6 microns, and the method effectively relieves the problems that the coating is easy to wrinkle and the edge curl of a blank part is easy to break due to the fact that the copper foil is too thin, and simultaneously has the advantages of simple and convenient operation, high production qualification rate and high coating precision.
The second purpose of the invention is to provide a lithium ion battery pole piece, which is prepared by the coating method of the lithium ion battery pole piece.
The invention provides a coating method of a lithium ion battery pole piece, which comprises the following steps:
firstly, conveying slurry and a foil strip to a coating machine for coating, wherein non-coated white residues are left on two sides of the whole foil strip in the longitudinal direction during coating, and then drying, rolling and cutting the foil strip in an oven in sequence to obtain a lithium ion battery pole piece;
a smoothing device is arranged at the outlet of the coating machine before the roller passes through;
the foil tape is a copper foil with the thickness of 6 mu m.
Further, the smoothing device comprises a smoothing rod and a fixing screw.
Further, the smoothing rod is cylindrical.
Furthermore, the angle of the intersection included angle alpha between the flattening rod and the foil strip is 0< alpha <90 degrees.
Furthermore, the smoothing device is made of heat-resistant and non-magnetic materials;
preferably, the smoothing device is made of Teflon or ceramic.
Further, the coating speed of the coating is 25-35 m/min.
Further, the drying temperature of the oven drying is 95-105 ℃.
Furthermore, the drying circulation air quantity of the drying oven is 20-30 Hz;
preferably, the circulating air volume for drying in the oven is 25 Hz.
Furthermore, the slitting direction is the transverse direction of the foil tape, and the slitting width is the width of the pole piece.
The lithium ion battery pole piece provided by the invention is prepared by the lithium ion battery pole piece coating method.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a coating method of a lithium ion battery pole piece, which is a coating method of a battery pole piece aiming at copper foil with the thickness of 6 mu m. The non-coated blank obtained by the coating method of the lithium ion battery pole piece is accurate in size, the problems that the coating is prone to wrinkling and the blank turned edge is prone to breaking due to the fact that the copper foil is too thin are effectively solved, and meanwhile the method has the advantages of being simple and convenient to operate, high in production qualification rate and high in coating accuracy.
The lithium ion battery pole piece provided by the invention is prepared by the lithium ion battery pole piece coating method. The lithium ion battery pole piece prepared by the coating method has thinner copper foil, so that the energy density is higher, the using cost of the copper foil is reduced while the energy density is improved, the hardness of burrs generated on the pole piece is reduced, and the risk of short circuit caused by the burrs is reduced.
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 schematic diagram of coating a lithium ion battery electrode sheet according to embodiment 1 of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, 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.
According to one aspect of the invention, a coating method of a lithium ion battery pole piece comprises the following steps:
firstly, conveying slurry and a foil strip to a coating machine for coating, wherein non-coated white residues are left on two sides of the whole foil strip in the longitudinal direction during coating, and then drying, rolling and cutting the foil strip in an oven in sequence to obtain a lithium ion battery pole piece;
a smoothing device is arranged at the outlet of the coating machine;
the foil tape is a copper foil with the thickness of 6 mu m.
The invention provides a coating method of a lithium ion battery pole piece, which is a coating method of a battery pole piece aiming at copper foil with the thickness of 6 mu m. The non-coated blank obtained by the lithium ion battery pole piece coating method is accurate in size, the problems that coating is prone to wrinkling and the curled edge of the blank is prone to breaking due to the fact that the copper foil is too thin are effectively solved, and meanwhile, the phenomenon that the curled edge is prone to cracking when the blank is rolled can be effectively avoided by arranging the flattening device, and the phenomenon that the foil is broken due to curling can be effectively avoided. In addition, the coating method provided by the invention has the advantages of simplicity and convenience in operation, high production qualification rate and high coating precision.
Furthermore, the deviation correcting speed of the deviation correcting device of the coating machine is reduced, sufficient buffering time is provided during deviation correction, and foil strip breakage is avoided.
In a preferred embodiment of the invention, the smoothing device comprises a smoothing rod and a fixing screw.
In a preferred embodiment of the invention, the smoothing rod is cylindrical.
As a preferred embodiment, the smoothing rod is cylindrical, so that the smoothing rod can better smooth the non-coated white and avoid the phenomenon of edge curling.
In the above preferred embodiment, the angle of the intersection angle α of the smoothing rod and the foil strip is 0< α <90 degrees.
As a preferred embodiment, the cross included angle range of the smoothing rod and the coating foil is 0-90 degrees, and when the included angle is too small, the length of the smoothing rod is increased; when the included angle is close to 90 degrees, the smoothing rod cannot play a role, and even the interference of a blank area is caused, so that the damage is caused.
In a preferred embodiment of the present invention, the smoothing device is made of a heat-resistant non-magnetic material;
in a preferred embodiment, the smoothing device is made of a heat-resistant and non-magnetic material, so that the influence of temperature and magnetic impurities on the quality of the pole piece can be avoided.
Preferably, the smoothing device is made of Teflon or ceramic.
In a preferred embodiment of the present invention, the coating speed of the coating is 25 to 35 m/min.
In the present invention, the above coating speeds are typically, but not limited to, 25m/min, 28m/min, 30m/min, 32m/min and 35 m/min.
In a preferred embodiment of the invention, the drying temperature of the oven drying is 95-105 ℃.
In one embodiment of the invention, the drying temperature of the oven drying is 95-105 ℃, and the drying temperature of the oven drying is adjusted to be lower 95-105 ℃, so that the drying process is more uniform, the drying of the surface layer of the slurry with too high drying temperature is avoided, but the drying below the surface layer is not uniform, and the hidden danger of cracking is avoided.
In the present invention, the drying temperature of the oven drying is typically, but not limited to, 95 ℃, 98 ℃, 100 ℃, 102 ℃ and 105 ℃.
In the preferred embodiment, the circulating air volume for drying in the oven is 20-30 Hz;
as a preferable embodiment, the circulating air quantity of the oven drying is 20-30 Hz, the drying process can be more uniform after the ventilation frequency is reduced, the drying of the surface layer of the slurry at a higher frequency (35Hz) is avoided, but the drying is not uniform below the surface layer, and the cracking hidden danger is avoided.
Preferably, the circulating air volume for drying in the oven is 25 Hz.
In a preferred embodiment of the present invention, the slitting direction is a transverse direction of the foil tape, and the slitting width is a width of the pole piece.
According to one aspect of the invention, the lithium ion battery pole piece is prepared by the lithium ion battery pole piece coating method.
The lithium ion battery pole piece provided by the invention is prepared by the lithium ion battery pole piece coating method. The lithium ion battery pole piece prepared by the coating method has thinner copper foil, so that the energy density is higher, and the cost of the copper foil is reduced while the energy density is improved. Moreover, the hardness of burrs generated on the pole piece can be reduced, and the risk of short circuit caused by the burrs is reduced.
The technical solution of the present invention will be further described with reference to the following examples.
Example 1
As shown in fig. 1, a coating method of a 6 μm copper foil lithium ion battery pole piece includes the following steps:
firstly, conveying slurry and a foil strip to a coating machine for coating, wherein non-coated white residues are left on two sides of the whole foil strip in the longitudinal direction during coating, the coating speed is 26m/min, and then drying, rolling and slitting are sequentially carried out through an oven to obtain a lithium ion battery pole piece;
a smoothing device comprising a ceramic smoothing rod and a fixing screw is arranged at the outlet of the coating machine, and the angle of the cross included angle alpha between the smoothing rod and the foil strip is 20 degrees;
the drying temperature of the drying oven is 100 ℃, and the circulating air quantity is 25 Hz.
Example 2
A coating method of a 6 μm copper foil lithium ion battery pole piece comprises the following steps:
firstly, conveying slurry and a foil strip to a coating machine for coating, wherein non-coated white residues are left on two sides of the whole foil strip in the longitudinal direction during coating, the coating speed is 35m/min, and then drying, rolling and slitting are sequentially carried out through an oven to obtain a lithium ion battery pole piece;
a smoothing device comprising a ceramic smoothing rod and a fixing screw is arranged at the outlet of the coating machine, and the angle of the cross included angle alpha between the smoothing rod and the foil strip is 30 degrees;
the drying temperature of the oven is 95 ℃, and the circulating air quantity is 20 Hz.
Example 3
A coating method of a 6 μm copper foil lithium ion battery pole piece comprises the following steps:
firstly, conveying slurry and a foil strip to a coating machine for coating, wherein non-coated white residues are left on two sides of the whole foil strip in the longitudinal direction during coating, the coating speed is 25m/min, and then drying, rolling and slitting are sequentially carried out through an oven to obtain a lithium ion battery pole piece;
a smoothing device comprising a ceramic smoothing rod and a fixing screw is arranged at the outlet of the coating machine, and the angle of the cross included angle alpha between the smoothing rod and the foil strip is 40 degrees;
the drying temperature of the oven is 98 ℃, and the circulating air volume is 24 Hz.
Example 4
A coating method of a 6 μm copper foil lithium ion battery pole piece comprises the following steps:
firstly, conveying slurry and a foil strip to a coating machine for coating, wherein non-coated white residues are left on two sides of the whole foil strip in the longitudinal direction during coating, the coating speed is 28m/min, and then drying, rolling and slitting are sequentially carried out through an oven to obtain a lithium ion battery pole piece;
a smoothing device comprising a ceramic smoothing rod and a fixing screw is arranged at the outlet of the coating machine, and the angle of the cross included angle alpha between the smoothing rod and the foil strip is 50 degrees;
the drying temperature of the oven is 102 ℃, and the circulating air quantity is 26 Hz.
Example 5
A coating method of a 6 μm copper foil lithium ion battery pole piece comprises the following steps:
firstly, conveying slurry and a foil strip to a coating machine for coating, wherein non-coated white residues are left on two sides of the whole foil strip in the longitudinal direction during coating, the coating speed is 30m/min, and then drying, rolling and slitting are sequentially carried out through an oven to obtain a lithium ion battery pole piece;
a smoothing device comprising a ceramic smoothing rod and a fixing screw is arranged at the outlet of the coating machine, and the angle of the cross included angle alpha between the smoothing rod and the foil strip is 80 degrees;
the drying temperature of the oven is 105 ℃, and the circulating air volume is 28 Hz.
Example 6
A coating method of a 6 μm copper foil lithium ion battery pole piece comprises the following steps:
firstly, conveying slurry and a foil strip to a coating machine for coating, wherein non-coated white residues are left on two sides of the whole foil strip in the longitudinal direction during coating, the coating speed is 32m/min, and then drying, rolling and slitting are sequentially carried out through an oven to obtain a lithium ion battery pole piece;
a smoothing device comprising a ceramic smoothing rod and a fixing screw is arranged at the outlet of the coating machine, and the angle of the cross included angle alpha between the smoothing rod and the foil strip is 70 degrees;
the drying temperature of the drying oven is 100 ℃, and the circulating air quantity is 25 Hz.
In summary, the coating method of the lithium ion battery pole piece provided by the invention is a coating method of the battery pole piece aiming at the copper foil with the thickness of 6 μm, the method comprises the steps of firstly conveying the slurry and the foil strip to a coating machine for coating, reserving non-coated margins at two sides of the whole foil strip in the longitudinal direction during coating, and then sequentially drying in an oven, rolling and cutting to obtain the lithium ion battery pole piece. The non-coated blank obtained by the coating method of the lithium ion battery pole piece is accurate in size, the problems that the coating is prone to wrinkling and the blank turned edge is prone to breaking due to the fact that the copper foil is too thin are effectively solved, and meanwhile the method has the advantages of being simple and convenient to operate, high in production qualification rate and high in coating accuracy.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A coating method of a lithium ion battery pole piece is characterized by comprising the following steps:
firstly, conveying slurry and a foil strip to a coating machine for coating, wherein non-coated white residues are left on two sides of the whole foil strip in the longitudinal direction during coating, and then drying, rolling and cutting the foil strip in an oven in sequence to obtain a lithium ion battery pole piece;
a smoothing device is arranged at the outlet of the coating machine drying oven before passing through the roller, and comprises a smoothing rod and a fixing screw; wherein: smoothing rods and fixing screws are arranged on two sides of the coating machine in the longitudinal direction of the foil strip, the smoothing rods on the two sides of the coating machine are respectively pressed on the blank leaving positions of the foil strip, and the fixing screws are used for fixing the smoothing rods;
the flattening rod is cylindrical, and the angle of the crossed included angle alpha between the flattening rod and the foil tape is 0< alpha <90 degrees;
the foil tape is a copper foil with the thickness of 6 mu m.
2. The coating method of the lithium ion battery pole piece according to claim 1, wherein the smoothing device is made of a heat-resistant and non-magnetic material.
3. The coating method of the lithium ion battery pole piece according to claim 2, wherein the smoothing device is made of Teflon or ceramic.
4. The coating method of the lithium ion battery pole piece according to claim 1, wherein the coating speed of the coating is 25-35 m/min.
5. The coating method of the lithium ion battery pole piece according to claim 1, wherein the drying temperature of the oven drying is 95-105 ℃.
6. The coating method of the lithium ion battery pole piece according to claim 1, wherein the circulating air volume of the drying oven for drying is 20-30 Hz.
7. The coating method of the lithium ion battery pole piece according to claim 6, wherein the circulating air volume of the oven drying is 25 Hz.
8. The coating method of the lithium ion battery pole piece according to claim 1, wherein the slitting direction is a transverse direction of the foil tape, and the slitting width is a width of the pole piece.
9. A lithium ion battery pole piece is characterized in that the lithium ion battery pole piece is prepared by the lithium ion battery pole piece coating method of any one of claims 1 to 8.
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| JP2014175254A (en) * | 2013-03-12 | 2014-09-22 | Toyota Industries Corp | Electrode manufacturing device and method of manufacturing electrode |
| CN104659292B (en) * | 2015-02-11 | 2017-10-20 | 李海博 | Cylindricality lithium ion battery and its processing technology |
| CN207199744U (en) * | 2017-07-28 | 2018-04-06 | 江苏楚汉新能源科技有限公司 | Edge curl preventing component and pole piece coating machine for pole piece coating machine |
| CN107895771A (en) * | 2017-11-14 | 2018-04-10 | 山东泰新能源股份有限公司 | The coating method and its apparatus for coating of a kind of electrodes of lithium-ion batteries |
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