CN102500524A - Process for coating lithium battery - Google Patents
Process for coating lithium battery Download PDFInfo
- Publication number
- CN102500524A CN102500524A CN2011103495657A CN201110349565A CN102500524A CN 102500524 A CN102500524 A CN 102500524A CN 2011103495657 A CN2011103495657 A CN 2011103495657A CN 201110349565 A CN201110349565 A CN 201110349565A CN 102500524 A CN102500524 A CN 102500524A
- Authority
- CN
- China
- Prior art keywords
- coating
- slurry
- temperature
- lithium battery
- roll
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Battery Electrode And Active Subsutance (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Coating Apparatus (AREA)
Abstract
The invention relates to the field of lithium ion batteries, in particular to a process for coating a film on a high-quality lithium ion battery pole piece. The process comprises the following steps of: 1, adding slurry which is mixed uniformly into a trough of a coating machine and coating the slurry on a current collector in a scraper transfer coating manner; 2, when a back roller is required to stop operation, making a coating roller to maintain the operating state, starting a constant-temperature control system and maintaining the temperature of the slurry in the trough unchanged; and 3, starting the back roller and continuously coating. According to the process, the temperature of the trough and the coating roller can be maintained constant in a shut-down process; the change of coating weight, which is caused by temperature change, is eliminated; and consistency of the coating weight is guaranteed.
Description
Technical field
The present invention relates to the lithium ion battery field, especially a kind of coating process of high-quality electrodes of lithium-ion batteries.
Background technology
The lithium ion cell electrode diaphragm normally shifts through scraper and extruding is transferred to and accomplished on the base material.The Weight control of scraper transfer coated is through the gap between doctor roll and applicator roll, and the adjusting of the velocity ratio of applicator roll and back flow roll realization; The Weight control of extruding transfer coated is to realize through common adjusting of slit size of the pump speed of measuring pump and cutting die.
In the normal scraper transfer coated production process; Slurry is driven in the hopper through pipeline under the effect of air driven pump; Slurry in the hopper is transferred to slurry on the base material from applicator roll through the reverse effect between applicator roll and back flow roll at applicator roll and back flow roll intersection in the gap between process applicator roll and the doctor roll under the drive of applicator roll.Weight control is extremely important in the coating process of reality, and the quality of electric core and the uniformity of performance are played conclusive effect.Transversal wave movement and vertical fluctuation two aspects are mainly divided in the fluctuation of weight in the coating process: laterally the weight fluctuation comes from mainly that factors such as doctor roll, applicator roll cause, vertically the weight fluctuation mainly comes from the state variation (like viscosity variations, sinking speed etc.) of slurry and the equipment that causes thus, the mechanical fluctuation.In the production process of reality; Usually can occur because a variety of causes causes the shutdown of the discontinuity of coating machine; It is on the low side suddenly that this situation causes that easily coating weight takes place, and causes a large amount of pole pieces because the coating weight product that causes on the low side is defective, if these dysponderal pole piece streams are moved the low capacity problem that the back operation also can cause electric core to; Reduce the yield rate of electric core, improved the manufacturing cost of electric core.
In view of this, coating process is shut down the weight problem on the low side that causes becomes the problem of needing solution in the pole piece coating process badly.
Summary of the invention
The objective of the invention is to: a kind of coating process of electrodes of lithium-ion batteries is provided to the deficiency of prior art, can effectively improves the gravimetric anomaly problem of coating pole piece, reduce the cost of manufacturing of battery.
Adopt following technical scheme to achieve these goals, may further comprise the steps:
The first step: the slurry that mixes is added in the coating machine hopper, adopt the mode of scraper transfer coated that slurry is coated on the collector;
Second step: when the needs back flow roll shut down, applicator roll kept operating condition, starts thermostatic control system simultaneously, kept the slurry temperature in the hopper not change;
The 3rd step: start back flow roll and continue coating.
With respect to prior art, the present invention can keep the temperature constant of hopper, applicator roll in stopping process, eliminated the variation of the coating weight that causes owing to variations in temperature, has guaranteed the uniformity of coating weight.
Comprise as the described thermostatic control system of a kind of improvement of the present invention: have the applicator roll of through hole, pipeline, liquid; Temperature controller, temperature sensor, heating/cooling source; Wherein be connected to form the loop through pipeline between heating/cooling source and the applicator roll, liquid circulates in the loop; Temperature sensor connects goes up temperature controller, and temperature controller is electrically connected with heating/cooling source.
As the through hole interface shape in a kind of improved applicator roll of the present invention is circular, square and other irregular shapes, can process easily, and processing cost is low.
As a kind of improved through hole interfacial area scope of the present invention from 1 square centimeter to 1000 square centimeters; When fluid at differing temperatures is passed through applicator roll from through hole, play the effect that the temperature of applicator roll is regulated.
As a kind of improved pipe material of the present invention is stainless steel, polytetrafluoroethylene (PTFE), rubber.
It has good heat-conducting to comprise water, NMP, alcohol, gasoline as a kind of improved liquid of the present invention.
As a kind of improved temperature sensor of the present invention is thermocouple sensor and infrared sensor, installs more conveniently, and precision is high.
Slurry temperature in the hopper feeds back to temperature controller through temperature sensor, and temperature controller is made the judgement of whether regulating according to the difference between actual temperature and the target temperature, and the instruction that will judge sends to heating, cooling source; The heating cooling source receives the action that order that temperature controller sends is promptly heated or cooled off liquid; The operation that liquid heats, cools off applicator roll, hopper in the pipeline, and the temperature of hopper is adjusted to target temperature.
Slurry has certain viscosity; Applicator roll generally adopts the metal steel material to make, and has certain friction between applicator roll and the slurry that is contacted, and this friction can produce certain heat; Heat can make that on the one hand slurry temperature raises, and can cause the expansion of applicator roll on the other hand; The temperature of slurry raises, and can make the viscosity of slurry reduce, and makes that the quality of finally transferring to the base material spreading mass through the gap reduces under the constant situation of doctor roll and coating clearance, makes the weight minimizing of coating; The expansion that applicator roll heat absorption causes brings the gap that is coated with between roller and doctor roll to reduce, and also makes the slurry of transferring on the base material through the gap reduce, and makes the minimizing of coating quality.In normal coating process, this fricative heat is taken away through slurry and the heat transmission transferred on the base material, makes that slurry and the applicator roll in the hopper keeps certain temperature, can not cause the variation of coating weight; Halfway in the stopping process, in order to keep slurry in the hopper caking that can not dry up, applicator roll will keep the state that moves, and the viscosity of the slurry that brings of heating up like this reduces and the expansion of applicator roll, and the weight that begins one section diaphragm after can causing starting shooting is on the low side.
The thermostatic control system of the coupling of transfer coater of the present invention, this temperature control system can guarantee slurry temperature-resistant in applicator roll and the hopper.When occurring beginning to shut down, open auto temperature controlled system immediately, monitor the fluctuation of its displays temperature, when opening coating again, close temperature control system and begin normal coating.
Description of drawings
Fig. 1 is a side view of the present invention;
Fig. 2 is a front view of the present invention.
The specific embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiment of the present invention is not limited thereto.
See Fig. 1-2, thermostatic control system of the present invention comprises and has the applicator roll 1 that diameter is the manhole 2 of 50mm that the external diameter of polytetrafluoroethylene (PTFE) material is 50mm; Internal diameter is the pipeline 3 of 45mm, nmp solvent liquid 4, temperature controller 5; Temperature sensor 6, heating/cooling source 7 is the hot and cold water heater.Temperature sensor 5 is thermocouple sensor and infrared sensor, installs more conveniently, and precision is high.The through hole 2 of applicator roll 1 is connected through pipeline 3 with heating/cooling source 7, and pipeline is equipped with the liquid 4 that can be heated/cool off for 3 li; The probe of temperature sensor 6 places the slurry of hopper, measures the temperature of slurry; Temperature controller is accepted the Temperature numerical of probe, and sends the signal of temperature adjusting to heating/cooling device; Heater is accepted the signal of temperature controller, and regulates the temperature of 3 li liquid 4 of pipeline.Temperature sensor 6, temperature controller and heating/cooling device connect through holding wire.The operation principle of thermostatic control system is following: temperature sensor 6 detects the change DeltaT of slurry temperature in the hopper; Give temperature controller with signal feedback; Temperature controller passes through logical calculated; And to heating/cooling device send the heating or the cooling instruction; Heating/cooling device begins 4 heating of the liquid in the pipeline 3 or cooling after receiving instruction, and 3 li liquid that are heated/cool off 4 of pipeline reduce to 0 through the effect of heat transmission with applicator roll 1 and the slurry temperature change DeltaT in the hopper, and the slurry temperature that reaches in applicator roll 1 and the hopper through such closure control remains unchanged.
Embodiment 1:
With solid matter content be 72%, the viscosity of slurry is the LiCoO that contains of 3500mPa.s
2Slurry be applied on the Al collector that thickness is 14um according to the mode of scraper transfer coated, coating target weight G is set in 280mg/1540.25mm
2The size in gap is controlled at 280 ± 4mg/1540.25mm with coating weight between the velocity ratio of adjusting applicator roll 1 and back flow roll and doctor roll and the applicator roll 1
2, beginning is coating normally, the temperature T 1 of record slurry; Be coated with after 60 minutes, close back flow roll, stop tape transport, keep applicator roll 1, start the initial temperature T1 of thermostatic control system record slurry, and pass through the automatic weighing system weighing and calculate the long diaphragm average weight of dry back 20m G1 with identical speed running; After 30 minutes, start back flow roll running beginning coating, the temperature T 2 of record slurry, and pass through the automatic weighing system weighing and calculate to start the long diaphragm average weight of back 20m G2.
Embodiment 2:
With solid matter content be 74%, the viscosity of slurry is the LiNiCoMnO that contains of 4350mPa.s
2Slurry be applied on the Al collector that thickness is 12um according to the mode of scraper transfer coated, coating weight target weight G is set in 296mg/1540.25mm
2The size in gap is controlled at 296 ± 5mg/1540.25mm with coating weight between the velocity ratio of adjusting applicator roll 1 and back flow roll and doctor roll and the applicator roll 1
2, beginning is coating normally, the temperature T 1 of record slurry; Be coated with after 75 minutes, close back flow roll, stop tape transport, keep applicator roll 1, start the temperature T 1 of thermostatic control system record slurry, and pass through the automatic weighing system weighing and calculate the long diaphragm average weight of dry back 30m G1 with identical speed running; After 60 minutes, start back flow roll running beginning coating, the initial temperature T2 of record slurry, and pass through the automatic weighing system weighing and calculate to start the long diaphragm average weight of back 30m G2;
Embodiment 3:
Solid matter content is 45%, the viscosity of slurry is 2200mPa.s the cathode size that the contains graphite mode according to the scraper transfer coated is applied on the Cu collector that thickness is 9um, and the weight target weight G of coating is set at 135mg/1540.25mm
2The size in gap is controlled at 135 ± 5mg/1540.25mm with coating weight between the velocity ratio of adjusting applicator roll 1 and back flow roll and doctor roll and the applicator roll 1
2, beginning is coating normally, the initial temperature T1 of record slurry; Be coated with after 90 minutes, close back flow roll, stop tape transport, keep applicator roll 1, start the initial temperature T1 of thermostatic control system record slurry with identical speed running, and through weighing and calculating the long diaphragm average weight of dry back 10m G1; After 45 minutes, start back flow roll running beginning coating, the initial temperature T2 of record slurry, and through weighing and calculating the long diaphragm average weight of startup back 30m G2;
Comparative Examples 1:
With solid matter content be 71%, the viscosity of slurry is the LiCoO that contains of 3200mPa.s
2Slurry be applied on the Al collector that thickness is 14um according to the mode of scraper transfer coated, coating weight target weight G is set at 280mg/1540.25mm
2The size in gap is controlled at 280 ± 4mg/1540.25mm with coating weight between the velocity ratio of adjusting applicator roll 1 and back flow roll and doctor roll and the applicator roll 1
2, beginning is coating normally, the initial temperature T1 of record slurry; Be coated with after 60 minutes, close back flow roll, stop tape transport, keep applicator roll 1, do not start thermostatic control system with identical speed running, the initial temperature T1 of record slurry, and through the automatic weighing system weighing and calculate the long diaphragm average weight of dry back 20m G1; After 30 minutes, start back flow roll running beginning coating, the initial temperature T2 of record slurry, and pass through the automatic weighing system weighing and calculate to start the long diaphragm average weight of back 20m G2;
Comparative Examples 2:
With solid matter content be 75%, the viscosity of slurry is the LiNiCoMnO that contains of 4200mPa.s
2Slurry be applied on the Al collector that thickness is 12um according to the mode of scraper transfer coated, Coating weight target weight G is set at 296mg/1540.25mm
2The size in gap is controlled at 296 ± 5mg/1540.25mm with coating weight between the velocity ratio of adjusting applicator roll 1 and back flow roll and doctor roll and the applicator roll 1
2, beginning is coating normally, the initial temperature T1 of record slurry; Be coated with after 75 minutes, close back flow roll, stop tape transport, keep applicator roll 1, do not start the initial temperature T1 of thermostatic control system record slurry, and also calculate the long diaphragm average weight of dry back 30m G1 through the automatic weighing system weighing with identical speed running; After 60 minutes, start back flow roll running beginning coating, the initial temperature T2 of record slurry, and pass through the automatic weighing system weighing and calculate to start the long diaphragm average weight of back 30m G2;
Comparative Examples 3:
Solid matter content is 44.5%, the viscosity of slurry is 2350mPa.s the cathode size that the contains graphite mode according to the scraper transfer coated is applied on the Cu collector that thickness is 9um, and the weight target weight G of coating is set at 135mg/1540.25mm
2The size in gap is controlled at 135 ± 5mg/1540.25mm with coating weight between the velocity ratio of adjusting applicator roll 1 and back flow roll and doctor roll and the applicator roll 1
2, beginning is coating normally, the initial temperature T1 of record slurry; Be coated with after 90 minutes, close back flow roll, stop tape transport, keep applicator roll 1, do not start thermostatic control system with identical speed running, the initial temperature T1 of record slurry, and through weighing and calculating the long diaphragm average weight of dry back 10m G1; After 45 minutes, start back flow roll running beginning coating, the initial temperature T2 of record slurry, and through weighing and calculating the long diaphragm average weight of startup back 30m G2;
Embodiment and Comparative Examples the data that obtained as follows tabulating:
Can find out from top data; Thermostatic control system can guarantee that when coating machine is out of service the slurry temperature that is coated with in back flow roll, the hopper is constant; And the phenomenon that coating weight is not lightened; Effectively solved coating and shut down the coating weight abnormal problem that causes midway, improved the excellent rate of the pole piece in the lithium ion battery coating process, reduced coating apparatus because the outage rate that gravimetric anomaly causes; Improve the quality of lithium-ion electric core simultaneously.
Need to prove that according to the announcement and the elaboration of above-mentioned specification, those skilled in the art in the invention can also change and revise above-mentioned embodiment.Therefore, the specific embodiment that discloses and describe above the present invention is not limited to also should be in the protection domain of claim of the present invention to equivalent modifications more of the present invention and change.In addition, although used some specific terms in this specification, these terms are explanation for ease just, the present invention is not constituted any restriction.
Claims (7)
1. a lithium battery coating process is characterized in that, may further comprise the steps:
The first step: the slurry that mixes is added in the coating machine hopper, adopt the mode of scraper transfer coated that slurry is coated on the collector;
Second step: when the needs back flow roll shut down, applicator roll kept operating condition, starts thermostatic control system simultaneously, kept the slurry temperature in the hopper not change;
The 3rd step: start back flow roll and continue coating.
2. a kind of lithium battery coating process according to claim 1, it is characterized in that: described thermostatic control system comprises: have the applicator roll of through hole, pipeline; Liquid; Temperature controller, temperature sensor, heating/cooling source; Wherein be connected to form the loop through pipeline between heating/cooling source and the applicator roll, liquid circulates in the loop; Temperature sensor connects goes up temperature controller, and temperature controller is electrically connected with heating/cooling source.
3. a kind of lithium battery coating process according to claim 2 is characterized in that: described through hole interface shape is circular, square or irregular shape.
4. a kind of lithium battery coating process according to claim 3 is characterized in that: said through hole interfacial area scope is from 1 square centimeter～1000 square centimeters.
5. a kind of lithium battery coating process according to claim 2 is characterized in that: described pipe material is stainless steel, polytetrafluoroethylene (PTFE), rubber.
6. a kind of lithium battery coating process according to claim 2, it is characterized in that: described liquid comprises any one in water, NMP, alcohol or the gasoline.
7. a kind of lithium battery coating process according to claim 2 is characterized in that: described temperature sensor is thermocouple sensor or infrared sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110349565.7A CN102500524B (en) | 2011-11-08 | 2011-11-08 | Process for coating lithium battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110349565.7A CN102500524B (en) | 2011-11-08 | 2011-11-08 | Process for coating lithium battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102500524A true CN102500524A (en) | 2012-06-20 |
| CN102500524B CN102500524B (en) | 2014-12-10 |
Family
ID=46212690
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110349565.7A Active CN102500524B (en) | 2011-11-08 | 2011-11-08 | Process for coating lithium battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102500524B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104588277A (en) * | 2013-10-31 | 2015-05-06 | 无锡华臻新能源科技有限公司 | Method and device for preventing to-be-coated lithium ion battery slurry solvent evaporation |
| CN107138340A (en) * | 2017-06-23 | 2017-09-08 | 广东天劲新能源科技股份有限公司 | One kind is continuously left white applying structure |
| WO2020118793A1 (en) * | 2018-12-14 | 2020-06-18 | 江西明冠锂膜技术有限公司 | Method for coating and processing membrane material and lithium electrode sheet base material |
| CN112151743A (en) * | 2020-09-27 | 2020-12-29 | 蜂巢能源科技有限公司 | Pore-forming method of thick electrode, product and application thereof |
| CN113909050A (en) * | 2021-11-03 | 2022-01-11 | 中化国际(控股)股份有限公司 | Coating surface density control device, coating machine and coating surface density control method |
| CN114709358A (en) * | 2022-03-22 | 2022-07-05 | 湖北亿纬动力有限公司 | Slurry coating method, electrode plate and lithium ion battery |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101623684A (en) * | 2008-07-07 | 2010-01-13 | 中信国安盟固利新能源科技有限公司 | Method for coating film for lithium ion battery pole piece and film coating equipment |
| CN201906689U (en) * | 2010-09-29 | 2011-07-27 | 常州绝缘材料总厂有限公司 | Coating device for producing lithium ion battery diaphragm |
-
2011
- 2011-11-08 CN CN201110349565.7A patent/CN102500524B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101623684A (en) * | 2008-07-07 | 2010-01-13 | 中信国安盟固利新能源科技有限公司 | Method for coating film for lithium ion battery pole piece and film coating equipment |
| CN201906689U (en) * | 2010-09-29 | 2011-07-27 | 常州绝缘材料总厂有限公司 | Coating device for producing lithium ion battery diaphragm |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104588277A (en) * | 2013-10-31 | 2015-05-06 | 无锡华臻新能源科技有限公司 | Method and device for preventing to-be-coated lithium ion battery slurry solvent evaporation |
| CN107138340A (en) * | 2017-06-23 | 2017-09-08 | 广东天劲新能源科技股份有限公司 | One kind is continuously left white applying structure |
| CN107138340B (en) * | 2017-06-23 | 2023-09-29 | 广东天劲新能源科技股份有限公司 | Continuous white coating structure |
| WO2020118793A1 (en) * | 2018-12-14 | 2020-06-18 | 江西明冠锂膜技术有限公司 | Method for coating and processing membrane material and lithium electrode sheet base material |
| CN112151743A (en) * | 2020-09-27 | 2020-12-29 | 蜂巢能源科技有限公司 | Pore-forming method of thick electrode, product and application thereof |
| CN113909050A (en) * | 2021-11-03 | 2022-01-11 | 中化国际(控股)股份有限公司 | Coating surface density control device, coating machine and coating surface density control method |
| CN114709358A (en) * | 2022-03-22 | 2022-07-05 | 湖北亿纬动力有限公司 | Slurry coating method, electrode plate and lithium ion battery |
| CN114709358B (en) * | 2022-03-22 | 2023-07-07 | 湖北亿纬动力有限公司 | Slurry coating method, electrode plate and lithium ion battery |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102500524B (en) | 2014-12-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102500524A (en) | Process for coating lithium battery | |
| US10403877B2 (en) | Manufacturing method of electrode and manufacturing apparatus of electrode | |
| CN107464856B (en) | Heterogeneous solar cells made of crystalline silicon piece low temperature series welding method and system | |
| CN109004250B (en) | Device and method for rapidly adjusting temperature and humidity of pipeline gas | |
| CN109305747A (en) | A kind of double platinum channel structures of ultra thin glass substrates | |
| WO2013023415A1 (en) | Flow battery system, and control method and device thereof | |
| CN110052587A (en) | Crystallizer cooling water control system and method | |
| CN105339156A (en) | Twin-screw extrusion device and method for manufacturing film | |
| CN116315266A (en) | Battery pack liquid cooling system, battery pack and flow distribution control method | |
| JP6825440B2 (en) | Electrode manufacturing method and electrode manufacturing equipment | |
| CN108215028B (en) | Mold system for preparing polishing pad and use method thereof | |
| CN212954845U (en) | Temperature regulating device for glass melt | |
| CN101759865B (en) | Method for preparing perfluor sulphonic acid proton exchange membranes by liquid surface tape casting method | |
| CN202099412U (en) | Polycrystal ingot furnace and heat exchange device thereof | |
| CN102691875B (en) | Method for adjusting lubricating oil temperature of oil film bearing | |
| CN202377498U (en) | Online monitoring and control device for smelting of copper alloy | |
| CN102566144B (en) | Alignment film drying system and alignment film drying method | |
| CN203875303U (en) | Constant water temperature control device of crystallizer of continuous casting machine | |
| TWI675504B (en) | Vehicle battery temperature regulation methods and temperature regulation system | |
| KR101266456B1 (en) | Coating apparatus having advanced coating performance | |
| CN102681565A (en) | CSTR (continuous stirred-tank reactor) temperature control system and method based on coil heat exchanger and jacketed heat exchanger | |
| CN104708897B (en) | A kind of film transfer apparatus, transfer printing board component, transfer apparatus absorption force control device | |
| CN201130266Y (en) | Temperature control device for optical microscope | |
| CN210386419U (en) | Pole piece cooling device for lithium ion battery and coating machine | |
| CN207441892U (en) | A kind of lithium battery partial volume device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |