CN210252945U - Device for eliminating extrusion coating thick edge and extrusion coating machine - Google Patents
Device for eliminating extrusion coating thick edge and extrusion coating machine Download PDFInfo
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- CN210252945U CN210252945U CN201921003898.2U CN201921003898U CN210252945U CN 210252945 U CN210252945 U CN 210252945U CN 201921003898 U CN201921003898 U CN 201921003898U CN 210252945 U CN210252945 U CN 210252945U
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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 utility model belongs to the technical field of lithium battery pole piece manufacturing, in particular to a device for eliminating extrusion coating thick edges and an extrusion coating machine with the device, wherein the device for eliminating extrusion coating thick edges comprises a gas nozzle arranged at the edge position above a lithium battery pole piece, and the gas injection direction of the gas nozzle is deviated to the outer side of the lithium battery pole piece; the horizontal distance between the gas nozzle and the edge of the lithium battery pole piece is 2-5 mm; the device for eliminating the extrusion coating thick edge provided by the utility model has the advantages that the gas nozzle is arranged at the edge position above the lithium battery pole piece, the slurry coated on the surface of the pole piece is blown by the airflow with pressure, and the excessive slurry at the edge part is blown to the outside to achieve the purpose of eliminating the thick edge; thereby avoiding a series of problems caused by the thick edge phenomenon.
Description
Technical Field
The utility model belongs to the technical field of lithium-ion battery pole piece makes, especially an eliminate device of extrusion coating thick limit and have device's extrusion coating machine.
Background
In the production technology of lithium battery pole pieces, extrusion coating is the most widely applied coating mode due to the advantages of high precision, wide coating window, high reliability and the like. Due to the characteristics of the slurry flow, "chunking" is a phenomenon that tends to occur at the start point, the end point, and both side edges of the coating, i.e., the thickness of the coating exceeds the nominal thickness. Generally, the edge thickness of a coating is more than ten microns thicker than a normal area, when coating, drying and rolling are performed, hundreds of pole pieces are rolled into a roll, the coating and rolling uniformity and subsequent processes are affected slightly, the pole pieces are torn seriously, and the area with large edge thickness bears larger pressure when the pole pieces are rolled, so that the rolling transverse density of the pole pieces is inconsistent, the rolled pole pieces are bulged (also called wavy edges), in the subsequent strip dividing, winding and other technological processes, the tension distribution of the pole pieces is unbalanced, the pole piece rolling and rolling alignment degree cannot be guaranteed, the processing size of the pole pieces is affected, and defective products are easy to occur. Uneven thickness and compaction density of the pole piece caused by the thick edge phenomenon also affect the performance of the lithium battery, and uneven current distribution may occur in the charging and discharging process, so that polarization is more easily formed. Therefore, the lithium battery pole pieces are inconsistent in the processes of charge and discharge expansion and contraction, the thick edges are easy to lose efficacy, and at present, enterprises mostly cut off thick parts at two sides and then wind the thick parts in strips, so that the method causes great waste and increases the cost of products.
SUMMERY OF THE UTILITY MODEL
To the problem among the prior art, an object of the utility model is to provide an eliminate device of extrusion coating thick limit avoids cutting the thick part in both sides after the coating and causes the waste.
In order to achieve the above purpose, the utility model adopts the following technical scheme to realize:
a device for eliminating extrusion coating thick edges comprises a gas nozzle arranged at the edge position above a lithium battery pole piece, wherein the gas injection direction of the gas nozzle deviates to the outer side of the lithium battery pole piece;
the horizontal distance between the gas nozzle and the edge of the lithium battery pole piece is 2-5 mm.
Preferably, the gas nozzle leads out one path from the gas path pipe of the coating machine, and the gas nozzle is communicated with the gas path pipe of the coating machine through a stainless steel pipe;
the stainless steel pipe is also connected with a pressure adjusting device for adjusting the gas pressure leading to the gas nozzle.
Preferably, the gas nozzle is a duckbill nozzle, and the nozzle gap interval of the duckbill nozzle is 1.5-3 mm.
Preferably, the included angle between the duckbill-type spray head and the plane of the lithium battery pole piece is 15-60 degrees, and the vertical distance between the nozzle of the duckbill-type spray head and the lithium battery pole piece is 5-20 mm.
The utility model also provides an extrusion coating machine that adopts above-mentioned elimination extrusion coating thick limit device.
Compared with the prior art, the utility model discloses following technological effect has:
the device for eliminating the extrusion coating thick edge provided by the utility model has the advantages that the gas nozzle is arranged at the edge position above the lithium battery pole piece, the slurry coated on the surface of the pole piece is blown by the airflow with pressure, and the excessive slurry at the edge part is blown to the outside to achieve the purpose of eliminating the thick edge; thereby avoiding a series of problems caused by the thick edge phenomenon.
Other features and advantages of the present invention will be described in detail in the following detailed description.
Drawings
FIG. 1 is a schematic view of an apparatus for removing extrusion coating bead according to the present invention;
the reference numbers in the figures illustrate: 1-lithium battery pole piece, 2-gas nozzle.
Detailed Description
In order to make the technical means, creation characteristics, achievement purpose and efficacy of the utility model easy to understand and understand, the utility model is further clarified by combining the specific drawings.
The utility model provides an eliminate device of extrusion coating thick limit, the device set up on the extrusion coating machine for improve the phenomenon of its marginal thick limit when carrying out coating paste to lithium-ion battery pole piece. Specifically, as shown in fig. 1, the device for eliminating the extrusion coating thick edge of the present invention includes a gas nozzle 2 disposed at the edge position above the lithium battery pole piece 1, and the gas injection direction of the gas nozzle 2 is biased to the outside of the lithium battery pole piece 1; the horizontal distance between the gas nozzle 2 and the edge of the lithium battery pole piece 1 is 2-5 mm.
The inventor of the application finds that in the prior art, after slurry is coated on a lithium battery pole piece, due to the characteristics of slurry fluid, a thick edge phenomenon easily occurs at the starting point, the ending point and two side edges of the coating, the width of the thick edge is generally 3-4mm, but the rolling and the rolling are seriously affected, and particularly, the edge bulging and even pole piece patterns occur in the rolling process, so that the defects are caused. Therefore, the inventor of the application arranges the gas nozzle at the edge position above the lithium battery pole piece coated with the slurry, and improves the phenomenon of thick edge through the blowing action of gas, thereby avoiding the bad phenomenon brought by the traditional process. Specifically, the utility model does not make special requirements on the arrangement position of the device for eliminating the extrusion coating thick edge, and the device is arranged at the position before entering the oven; in addition, the inventor of the application finds that the distance between the gas nozzle and the edge of the lithium battery pole piece is preferably kept to be 3-5mm, and if the distance is too far, the gas is blown unevenly in the area with normal thickness.
Furthermore, according to the utility model, the gas nozzle is led out from the gas path pipe of the coating machine, and is communicated with the gas path pipe of the coating machine through the stainless steel pipe;
the stainless steel pipe is also connected with a pressure adjusting device for adjusting the gas pressure leading to the gas nozzle. The pressure adjusting device is used for adjusting the pressure of gas coming out of the gas path pipe of the coating machine, so that the pressure adjusting device is suitable for being coated on slurry with different viscosities on the lithium battery pole pieces. Specifically, the pressure regulating device may be selected from pressure reducers for 210SR series piping manufactured by jirui corporation (shanghai).
Further, according to the utility model discloses, gas shower nozzle be duckbilled formula shower nozzle, duckbilled formula shower nozzle's spout gap interval is 1.5-3mm, more preferably 2 mm.
Furthermore, the included angle between the duckbill-type spray head and the plane of the lithium battery pole piece is 15-60 degrees, and the vertical distance between the nozzle of the duckbill-type spray head and the lithium battery pole piece is 5-20 mm.
The utility model also provides an extrusion coating machine, extrusion coating machine have the above-mentioned device of eliminating extrusion coating thick limit.
The device for eliminating the extrusion coating bead provided by the present invention is further described below by specific examples.
In a specific example, the areal density (mg/10 cm) of the coated article was measured2) And edge thickness (μm) of the coated finished product to evaluate the coating effect:
the method for measuring the surface density of the coating finished product comprises the following steps: at the positions which are respectively 30mm away from the coating head and the coating tail of the pole piece and in the middle, 3 areas which are 10cm are uniformly taken in the direction vertical to the coating direction2The weight of the small wafer is weighed by an electronic balance.
The method for measuring the edge thickness of the coated finished product comprises the following steps: cutting a small pole piece with the width of 5mm along the coating direction at the two sides of the coating edge of the pole piece and the middle position of the pole piece, measuring the thickness of the pole piece by using a micrometer with the measuring head being 3mm in diameter, and measuring 3 data and calculating the average value of each pole piece.
The following are key parameters in the comparative experiments:
coating machine: an automatic Zhuangling ZL-J750-30 coating machine;
the anode slurry comprises the following ingredients: lithium nickel cobalt manganese oxide, SP and PVDF, and NMP as solvent;
the negative electrode slurry comprises the following ingredients: graphite, SP, KS-6, CMC and SBR, and a solvent is deionized water;
respectively stirring the materials forming the anode slurry and the cathode slurry in a double-planet type vacuum stirrer to prepare uniform and stable slurry; in a specific embodiment of the present invention, the positive electrode slurry has a viscosity of 5531mPa · s and a solid content of 67.52%; the viscosity of the negative electrode slurry is 4544mPa · s, and the solid content is 42.48%;
the positive electrode used was 636X 0.014mm aluminum foil, and the negative electrode used was 650X 0.008mm copper foil.
The gas nozzle adopted in the utility model is a duckbilled nozzle pressed by a pipe with the diameter of 4mm, the nozzle gap interval of the duckbilled nozzle is 2mm, the pressure regulator is a pressure reducer for 210SR series piping produced by Jirui corporation (Shanghai), and the pressure is controlled to be 0.03 MPa;
the horizontal distance between the duckbill-type spray head and the edge of the lithium battery pole piece is 4 mm;
the plane included angle of the duckbilled nozzle and the lithium battery pole piece is 45 degrees, and the vertical distance from the nozzle of the duckbilled nozzle to the lithium battery pole piece is 8 mm.
In a specific comparison experiment, the duckbill-type spray heads are additionally arranged and not arranged on an extrusion coating machine, the base materials and the materials are controlled to be in the same preparation batch, technological parameters such as coating pump speed, drying oven temperature, coating speed and the like before and after the duckbill-type spray heads are additionally arranged are consistent, and the density of a double-sided coating surface of the positive electrode is designed to be 500mg/cm2The density of the two coating surfaces of the negative electrode is 330mg/cm2Intermittent coating is adopted.
Table 1: coating slurry for positive electrode (without extrusion coating thick edge eliminating device)
Table 2: positive coating slurry (with device for eliminating extrusion coating thick edge)
Table 3: cathode coating slurry (without extrusion coating thick edge elimination device)
Table 4: cathode coating slurry (with device for eliminating extrusion coating thick edge)
By comparing tables 1, 2; the experimental data of table 3, 4 can see out, through installing additional the utility model provides an eliminate improvement coating thick limit phenomenon that device of extrusion coating thick limit can be obvious, the effectual harmful effects of having avoided "thick limit" to produce.
The foregoing shows and describes the general principles, essential features, and features of the invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the description of the above embodiments and the description is only illustrative of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the present invention, and these changes and modifications are all within the scope of the present invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A device for eliminating extrusion coating thick edges is characterized by comprising a gas nozzle arranged at the edge position above a lithium battery pole piece, wherein the gas injection direction of the gas nozzle deviates to the outer side of the lithium battery pole piece;
the horizontal distance between the gas nozzle and the edge of the lithium battery pole piece is 2-5 mm.
2. The device for eliminating the extrusion coating thick edge as claimed in claim 1, wherein the gas nozzle is led out from the gas path pipe of the coating machine in a path, and the gas nozzle is communicated with the gas path pipe of the coating machine through a stainless steel pipe;
the stainless steel pipe is also connected with a pressure adjusting device for adjusting the gas pressure leading to the gas nozzle.
3. The device for eliminating the extrusion coating thick edge as claimed in claim 1, wherein the gas nozzle is a duckbill nozzle, and the nozzle gap interval of the duckbill nozzle is 1.5-3 mm.
4. The device for eliminating the extrusion coating thick edge as claimed in claim 3, wherein the included angle between the duckbill-type spray head and the plane of the lithium battery pole piece is 15-60 degrees, and the vertical distance between the nozzle of the duckbill-type spray head and the lithium battery pole piece is 5-20 mm.
5. An extrusion coater having the apparatus for removing an extrusion coating bead according to any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921003898.2U CN210252945U (en) | 2019-06-28 | 2019-06-28 | Device for eliminating extrusion coating thick edge and extrusion coating machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921003898.2U CN210252945U (en) | 2019-06-28 | 2019-06-28 | Device for eliminating extrusion coating thick edge and extrusion coating machine |
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| CN210252945U true CN210252945U (en) | 2020-04-07 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110237996A (en) * | 2019-06-28 | 2019-09-17 | 安徽天时新能源科技有限公司 | A kind of device and extrusion coating machine for eliminating extrusion coated webbing |
| WO2023169105A1 (en) * | 2022-03-09 | 2023-09-14 | 江苏时代新能源科技有限公司 | Coating apparatus and substrate processing equipment |
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2019
- 2019-06-28 CN CN201921003898.2U patent/CN210252945U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110237996A (en) * | 2019-06-28 | 2019-09-17 | 安徽天时新能源科技有限公司 | A kind of device and extrusion coating machine for eliminating extrusion coated webbing |
| WO2023169105A1 (en) * | 2022-03-09 | 2023-09-14 | 江苏时代新能源科技有限公司 | Coating apparatus and substrate processing equipment |
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