CN111701798B - A membrane coating device and a coating method thereof - Google Patents
A membrane coating device and a coating method thereof Download PDFInfo
- Publication number
- CN111701798B CN111701798B CN202010670329.4A CN202010670329A CN111701798B CN 111701798 B CN111701798 B CN 111701798B CN 202010670329 A CN202010670329 A CN 202010670329A CN 111701798 B CN111701798 B CN 111701798B
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- Prior art keywords
- coating
- wire rod
- diaphragm
- traction
- wire
- Prior art date
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- 238000000576 coating method Methods 0.000 title claims abstract description 152
- 239000011248 coating agent Substances 0.000 title claims abstract description 141
- 239000012528 membrane Substances 0.000 title claims description 8
- 230000000903 blocking effect Effects 0.000 claims abstract description 37
- 239000002002 slurry Substances 0.000 claims description 30
- 238000011084 recovery Methods 0.000 claims description 11
- 238000004804 winding Methods 0.000 claims description 9
- 230000007246 mechanism Effects 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 abstract description 4
- 230000006835 compression Effects 0.000 abstract 1
- 238000007906 compression Methods 0.000 abstract 1
- 238000003825 pressing Methods 0.000 description 22
- 238000000034 method Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011268 mixed slurry Substances 0.000 description 2
- 229920000098 polyolefin Polymers 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
- B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
- B05C11/023—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
- B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
- B05C11/1039—Recovery of excess liquid or other fluent material; Controlling means therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C13/00—Means for manipulating or holding work, e.g. for separate articles
- B05C13/02—Means for manipulating or holding work, e.g. for separate articles for particular articles
-
- 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
Landscapes
- Coating Apparatus (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses a diaphragm coating device and a coating method thereof, wherein the diaphragm coating device comprises a wire rod, a coating table for fixing a diaphragm and a traction motor for controlling the wire rod to move along the coating direction of the diaphragm, the traction motor is connected with the wire rod through a traction wire, the wire rod is provided with a blocking wire which enables the wire rod to have a trend of moving along the direction opposite to the coating direction, two ends of the wire rod are provided with Shi Yaxian which enables the wire rod to generate downward pressure, the coating table is provided with a coating window penetrating through the upper surface and the lower surface of the wire rod, when in coating, the diaphragm is arranged across the coating window along the coating direction, a gap is kept between two sides of the diaphragm which is perpendicular to the coating direction and the coating window, the wire rod is arranged on the upper surface of the diaphragm, and two axial ends of the wire rod extend to the gap to enable the compression wire to naturally droop through the gap. The invention can avoid the condition that the diaphragm is wrinkled in the coating process, improve the coating uniformity, improve the coating quality, adapt to the requirements of different coating thicknesses and ensure the accuracy of experimental results.
Description
Technical Field
The invention relates to the technical field of lithium battery diaphragm production, in particular to a diaphragm coating device and a diaphragm coating method for laboratory use.
Background
The lithium ion battery diaphragm is mainly made of polyolefin materials, and the common battery diaphragm is poor in heat resistance due to the properties of the polyolefin materials, and can obviously shrink at a temperature above 100 ℃ so as to threaten the safety of the battery. In order to solve the current problem, the membrane is required to be functionally improved, and the most economical and effective method in the prior art is to coat a layer of inorganic matters on the surface of the membrane for supporting, so as to inhibit the shrinkage phenomenon of the membrane caused by heating. The method for coating inorganic mixed slurry in a laboratory is to coat the inorganic mixed slurry by using a wire rod coater, attach a diaphragm to glass during coating, then carry out blade coating by using a motor to drive a wire rod, and the coating is uneven due to the fact that the speed and the strength cannot be accurately controlled, so that the experimental result is inaccurate, the research and development effect is affected, and the same wire rod can only be coated with one thickness specification and cannot be coated with different thicknesses according to requirements.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a diaphragm coating device and a coating method thereof, which can avoid the condition that the diaphragm is wrinkled in the coating process, improve the coating uniformity and meet the requirements of different coating thicknesses.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
The utility model provides a diaphragm coating device, includes the bar, is used for fixing the coating platform of diaphragm and is used for controlling the traction motor that the bar removed along the coating direction of diaphragm, traction motor passes through the traction wire and is connected with the bar, be equipped with the hindrance line that makes the bar have the trend of removing along the opposite direction of coating direction on the bar, the both ends of bar are equipped with the Shi Yaxian that make the bar produce down force, the coating platform is equipped with the coating window that runs through its upper and lower surface, and during the coating, the diaphragm spanes the coating window setting along the coating direction, and keeps the clearance between the both sides of diaphragm perpendicular to coating direction and the coating window, and the bar is located the upper surface of diaphragm, and the axial both ends of bar stretch to clearance department and make the line of pressurizing pass the clearance natural whereabouts.
As a preferable scheme, the traction wires are two, one ends of the two traction wires are respectively connected with two ends of the wire rod, and the other ends of the two traction wires are connected with a winding shaft of the traction motor.
As a preferable scheme, the coating table is provided with a traction guide ring for guiding the trend of the traction wires, and the two traction wires respectively penetrate through the corresponding traction guide rings to be connected with the winding shaft.
As a preferable scheme, the blocking lines are also provided with two blocking lines, one ends of the two blocking lines are respectively connected with two ends of the wire rod, the other ends of the two blocking lines are connected with blocking weights with the same weight, and the sum of the weights of the blocking weights on the two blocking lines is larger than the weight of the wire rod.
As a preferable scheme, one end of each pressing line is connected with a pressing weight, and the weights on the two pressing lines are the same in weight.
As a preferred solution, the length of the blocking wire is greater than the coating stroke of the bar, and the length of the pressing wire is less than the minimum distance between the bar and the ground.
As a preferable scheme, the coating table is provided with a support column, and the support column is provided with a height adjusting mechanism.
As a preferable mode, the lower side of the coating table along the coating direction is provided with a slurry recovery tank, and the slurry recovery tank is provided with a slurry outflow port.
As a preferred scheme, the motor control device further comprises a motor control assembly, wherein the motor control assembly comprises a forward rotation button, a reverse rotation button, a rotating speed adjusting button and a motor switch.
A method of coating a separator comprising the steps of:
S1, arranging a coating window penetrating through the upper surface and the lower surface of a coating table, flattening the diaphragm, and enabling the diaphragm to cross the coating window along the coating direction;
S2, arranging a wire rod on the upper surface of the diaphragm, and enabling the wire rod to generate certain downward pressure on the surface of the diaphragm by arranging pressing wires at two ends of the wire rod;
s3, winding the traction wire under the control of the traction motor, controlling the wire rod to move at a constant speed along the coating direction under certain resistance through the traction wire, uniformly dripping the slurry at the front end of the advancing direction of the wire rod, and uniformly wiping the slurry on the surface of the diaphragm through the wire rod.
The working process of the invention is as follows:
Firstly, arranging a diaphragm across a coating window along the coating direction after flattening the diaphragm, then arranging a wire rod on the upper surface of the diaphragm, arranging a blocking weight with a certain weight on a blocking wire in the axial direction of the wire rod and vertical to the coating direction, tensioning the pulling wire between a traction motor and the wire rod, arranging the pressing weight with a certain weight on a pressing wire according to the coating thickness, selecting a forward rotating button on a motor control assembly after setting the motor rotating speed, enabling the wire rod to uniformly move on the surface of the diaphragm under the pulling of the pulling wire, simultaneously uniformly dripping slurry at the front end of the advancing direction of the wire rod, wiping the slurry on the surface of the diaphragm through the wire rod, taking down the diaphragm after coating is completed, then selecting a reverse rotating button on the motor control assembly, and returning the wire rod to the direction opposite to the coating direction under the acting force of the blocking weight.
Compared with the prior art, the invention has the obvious advantages and beneficial effects that 1, the coating window is arranged on the coating table, the diaphragm is arranged transversely across the coating window along the coating direction, the diaphragm is coated under the condition of keeping tension, the condition that the diaphragm is wrinkled during coating is avoided, the coating uniformity is improved, the coating quality is improved, 2, the wire rod is provided with the blocking wire which enables the wire rod to move in the direction opposite to the coating direction, so that the wire rod can be kept in a tight state under the action of the blocking wire and the traction wire, the accurate control of the moving speed of the wire rod is realized, the coating quality is improved, 3, the tension on the pressing wire can be controlled according to the requirement of the coating thickness by arranging Shi Yaxian for enabling the wire rod to generate the downward pressure at the two ends of the wire rod, so that the pressure between the wire rod and the diaphragm is changed, when the pressure is high, the coating thickness is reduced, and when the pressure is high, the coating thickness is increased, and the requirement of different coating thicknesses is met.
For a clearer description of the structural features, technical means, and specific objects and functions achieved by the present invention, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments:
Drawings
FIG. 1 is a schematic diagram of an assembled structure of an embodiment of the present invention.
The attached drawings are used for identifying and describing:
1. coating table 2, slurry recovery tank 3, and traction motor
4. Coating window 5, slurry outlet 6, diaphragm
7. Traction guide ring 8, wire rod 9 and blocking guide ring
10. Traction wire 11, pressing wire 12 and pressing weight
13. Blocking line 14, blocking weight 15, support column
16. Height adjusting mechanism 17, forward rotation button 18, reverse rotation button
19. A rotation speed adjusting button 20, a winding shaft 21 and a motor switch.
Detailed Description
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description and to simplify the description, and do not indicate or imply that the positions or elements referred to must have specific directions, be configured and operated in specific directions, and thus should not be construed as limiting the present invention.
In the description of the present invention, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements. The specific meaning of the above terms in the present invention can be understood as appropriate by those of ordinary skill in the art.
As shown in fig. 1, a diaphragm coating device comprises a wire rod 8, a coating table 1 for fixing a diaphragm 6 and a traction motor 3 for controlling the wire rod 8 to move along the coating direction of the diaphragm, wherein the traction motor 3 is connected with the wire rod 8 through a traction wire 10, a blocking wire 13 which enables the wire rod 8 to have a trend of moving along the direction opposite to the coating direction is arranged on the wire rod 8, a pressing wire 11 which enables the wire rod 8 to generate downward pressure is arranged at two ends of the wire rod 8, the coating table 1 is provided with a coating window 4 penetrating through the upper surface and the lower surface of the wire rod 8, when the diaphragm 6 is coated, the diaphragm is arranged across the coating window 4 along the coating direction, a gap is kept between two sides of the diaphragm 6 perpendicular to the coating direction and the coating window 4, the wire rod 8 is arranged on the upper surface of the diaphragm 6, and the two axial ends of the wire rod 8 extend to the gap to enable the pressing wire 11 to naturally droop through the gap. And a motor control assembly comprising a forward rotation button 17, a reverse rotation button 18, a rotation speed adjusting button 19 and a motor switch 21.
In the invention, in order to keep the movement balance of the wire rod 8, two traction wires 10 are arranged, one ends of the two traction wires 10 are respectively connected with two ends of the wire rod 8, and the other ends of the two traction wires 10 are connected with a winding shaft 20 of the traction motor 3. The two blocking lines 13 are also arranged, one ends of the two blocking lines 13 are respectively connected with two ends of the wire rod 8, the other ends of the two blocking lines 13 are respectively connected with blocking weights 14 with the same weight, and the sum of the weights of the blocking weights 14 on the two blocking lines 13 is larger than the weight of the wire rod 8, so that the wire rod 8 is prevented from sliding downwards. One end of each pressing line 11 is connected with a pressing weight 12, and the weights 12 on the two pressing lines 11 are the same in weight.
The coating table 1 is provided with a traction guide ring 7 for guiding the trend of the traction wires 10, and the two traction wires 10 respectively pass through the corresponding traction guide rings 7 and are connected with the winding shaft 20. The coating table 1 is provided with a blocking guide ring 9 for guiding the trend of the blocking line 13, and the blocking line 13 passes through the blocking guide ring 9 and then is connected with a blocking weight 14.
In the invention, the length of the blocking wire 13 is longer than the coating stroke of the wire rod 8, so that the blocking wire 13 always maintains the same resistance in the coating process of the wire rod 8. The length of the pressing line 11 is smaller than the minimum distance between the bar 8 and the ground, so that the situation that the pressing weight 12 on the pressing line 11 is contacted with the ground during the coating process to cause inconsistent pressure is avoided.
In the invention, a slurry recovery tank 2 is arranged at the lower side of the coating table 1 along the coating direction, the slurry recovery tank 2 is movably connected with the coating table 1, and the slurry recovery tank 2 is provided with a slurry outflow port 5. The coating table 1 is provided with a support column 15, the support column 15 is provided with a height adjusting mechanism 16, before coating, the height of the support column 15 can be adjusted through the height adjusting mechanism 16, so that the coating table 1 is inclined downwards along the coating direction, slurry flows towards the slurry recovery tank 2, slurry recovery is facilitated, and meanwhile, the height of the slurry recovery tank 2, which is far away from the slurry outflow port 5, is greater than that of the slurry outflow port 5, so that slurry can smoothly flow out of the slurry outflow port 5.
The invention also provides a diaphragm coating method, which comprises the following steps:
S1, arranging a coating window penetrating through the upper surface and the lower surface of a coating table, flattening the diaphragm, and enabling the diaphragm to cross the coating window along the coating direction;
s2, arranging a wire rod on the upper surface of the diaphragm, and arranging a pressing wire at two ends of the wire rod 8 to enable the wire rod to generate certain downward pressure on the surface of the diaphragm;
s3, winding the traction wire under the control of the traction motor, controlling the wire rod to move at a constant speed along the coating direction under certain resistance through the traction wire, uniformly dripping the slurry at the front end of the advancing direction of the wire rod, and uniformly wiping the slurry on the surface of the diaphragm through the wire rod.
The working process of the invention is as follows:
Firstly, the diaphragm 6 is flattened and then is arranged across the coating window 4 along the coating direction, then the wire rod 8 is arranged on the upper surface of the diaphragm 6, the axial direction of the wire rod 8 is vertical to the coating direction, a certain weight of blocking weight 14 is arranged on the blocking wire 13, a traction wire 10 between the traction motor 3 and the wire rod 8 is tensioned, a certain weight of pressing weight 12 is arranged on the pressing wire 11 according to the coating thickness, a forward rotation button 17 on a motor control assembly is selected after the motor rotation speed is set, the wire rod 8 moves on the surface of the diaphragm 6 at a constant speed under the traction of the traction wire 10, meanwhile, slurry is uniformly dripped at the front end of the wire rod 8 in the advancing direction, so that the slurry is smeared on the surface of the diaphragm 6 through the wire rod 8, after the coating is finished, the diaphragm 6 is taken down, a reverse rotation button 18 on the motor control assembly is selected, and the wire rod 8 returns to the direction opposite to the coating direction under the acting force of the blocking weight 14.
In summary, the coating window 4 is arranged on the coating table 1, the diaphragm 6 is arranged across the coating window 4 along the coating direction, the diaphragm 6 is coated under the condition of keeping tension, the condition that the diaphragm 6 is wrinkled during coating is avoided, the coating uniformity is improved, the coating quality is improved, the blocking wire 13 which enables the wire rod 8 to have a trend of moving along the direction opposite to the coating direction is arranged on the wire rod 8, the wire rod 8 can be kept in a tight state under the action of the blocking wire 13 and the traction wire 10, the accurate control of the moving speed of the wire rod 8 is realized, the coating quality is improved, the tension of the wire rod 11 is controlled according to the requirement of the coating thickness by arranging the pressing wire 11 which enables the wire rod 8 to generate the downward pressure at the two ends of the wire rod 8, the pressure between the wire rod 8 and the diaphragm 6 is changed, the coating thickness is reduced when the pressure is high, and the coating thickness is increased when the pressure is low, and the requirements of different coating thicknesses are met.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, so any modifications, equivalents, improvements, etc. of the above embodiments according to the present invention are still within the scope of the present invention.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010670329.4A CN111701798B (en) | 2020-07-13 | 2020-07-13 | A membrane coating device and a coating method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010670329.4A CN111701798B (en) | 2020-07-13 | 2020-07-13 | A membrane coating device and a coating method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111701798A CN111701798A (en) | 2020-09-25 |
| CN111701798B true CN111701798B (en) | 2024-12-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN202010670329.4A Active CN111701798B (en) | 2020-07-13 | 2020-07-13 | A membrane coating device and a coating method thereof |
Country Status (1)
| Country | Link |
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| CN (1) | CN111701798B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN212596766U (en) * | 2020-07-13 | 2021-02-26 | 宁德卓高新材料科技有限公司 | A diaphragm coating device |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1395988A (en) * | 1972-10-26 | 1975-05-29 | Armour Moore Marine Service | Surface treatment |
| DE9203994U1 (en) * | 1992-03-25 | 1992-06-25 | JPM Ingenieurtechnik GmbH, 2359 Henstedt-Ulzburg | gas tank |
| US7213296B2 (en) * | 2004-07-06 | 2007-05-08 | Billy Star Holding Ltd | Spreading apparatus for flowable materials and spreader pad therefor |
| JP2008218125A (en) * | 2007-03-02 | 2008-09-18 | Matsushita Electric Ind Co Ltd | Negative electrode for lithium ion secondary battery and lithium ion secondary battery |
| JP5073733B2 (en) * | 2009-11-30 | 2012-11-14 | シャープ株式会社 | Storage battery forced discharge mechanism and safety switch device |
| TR201100090A2 (en) * | 2011-01-05 | 2012-07-23 | Aksa Akri̇li̇k Ki̇mya Sanayi̇ Anoni̇m Şi̇rketi̇ | A system for finishing application. |
| JP5789569B2 (en) * | 2012-06-27 | 2015-10-07 | 東京エレクトロン株式会社 | Coating device and nozzle |
| CN205904076U (en) * | 2016-08-08 | 2017-01-25 | 北京古德沃德工业控制设备有限公司 | Grinding roller anti -corrosive steel plate's device that oils |
| CN108560229A (en) * | 2018-07-12 | 2018-09-21 | 长兴明远布艺科技有限公司 | A kind of fabric coatings set composite |
| CN209291111U (en) * | 2018-10-26 | 2019-08-23 | 苏州宝特远电子科技有限公司 | A kind of thermal energy rubber roller rollon backing board film covering device |
| CN209287630U (en) * | 2018-12-07 | 2019-08-23 | 安徽新衡新材料科技有限公司 | A kind of coating bar and paste coater for battery diaphragm coating laboratory |
| CN109675756A (en) * | 2018-12-24 | 2019-04-26 | 中材锂膜有限公司 | A kind of small-sized coating equipment and application method |
| CN110010973B (en) * | 2019-04-03 | 2024-02-09 | 东莞市卓高电子科技有限公司 | Automatic feeding and cleaning system for lithium battery coating |
| CN210357850U (en) * | 2019-07-05 | 2020-04-21 | 深圳市富程威科技有限公司 | Liquid glue coating device |
-
2020
- 2020-07-13 CN CN202010670329.4A patent/CN111701798B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN212596766U (en) * | 2020-07-13 | 2021-02-26 | 宁德卓高新材料科技有限公司 | A diaphragm coating device |
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| CN111701798A (en) | 2020-09-25 |
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