CN102500524B - Process for coating lithium battery - Google Patents
Process for coating lithium battery Download PDFInfo
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- CN102500524B CN102500524B CN201110349565.7A CN201110349565A CN102500524B CN 102500524 B CN102500524 B CN 102500524B CN 201110349565 A CN201110349565 A CN 201110349565A CN 102500524 B CN102500524 B CN 102500524B
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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 lithium ion battery field, especially a kind of coating process of high-quality electrodes of lithium-ion batteries.
Background technology
Lithium ion cell electrode diaphragm is normally shifted and is pushed by scraper to transfer to and completes on base material.The Weight control of scraper transfer coated is by 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 by the pump speed of measuring pump and common adjusting of the slit of cutting die size.
In normal scraper transfer coated production process, slurry is driven in hopper by pipeline under the effect of air driven pump, slurry in hopper through the gap between applicator roll and doctor roll, is transferred to slurry on base material from applicator roll by the reverse effect between applicator roll and back flow roll at applicator roll and back flow roll intersection under the drive of applicator roll.In actual coating process, Weight control is extremely important, and the quality to battery core and the uniformity of performance play conclusive effect.Transversal wave movement and longitudinal fluctuation two aspects are mainly divided in the fluctuation of weight in coating process: laterally weight fluctuation mainly comes from that the factor such as doctor roll, applicator roll causes, longitudinal-weight fluctuation mainly comes from the state variation (as viscosity variations, sinking speed etc.) of slurry and the equipment causing thus, mechanical fluctuation.In actual production process; usually there will be because a variety of causes causes the shutdown of the discontinuity of coating machine; it is on the low side suddenly that this situation easily causes that coating weight occurs; cause a large amount of pole pieces to cause product defective because coating weight is on the low side; if these dysponderal pole piece streams are moved rear operation to and also can cause the low capacity problem of battery core; reduce the yield rate of battery core, improved the manufacturing cost of battery core.
In view of this, coating process is shut down the weight problem on the low side causing becomes the problem of needing solution in pole coating process badly.
Summary of the invention
The object of the invention is to: a kind of coating process of electrodes of lithium-ion batteries is provided for the deficiencies in the prior art, can effectively improves the gravimetric anomaly problem of coating pole piece, reduce the cost of manufacturing of battery.
Adopt to achieve these goals following technical scheme, comprise the following steps:
The first step: the slurry mixing is added in trough of coating machine, adopt the mode of scraper transfer coated that slurry is coated on collector;
Second step: in the time that needs back flow roll shuts down, applicator roll keeps operating condition, starts thermostatic control system simultaneously, keeps the slurry temperature in 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, has eliminated the variation of the coating weight causing due to variations in temperature, has guaranteed the uniformity of coating weight.
Comprise as the thermostatic control system described in a modification of the present invention: with the applicator roll of through hole, pipeline, liquid, temperature controller, temperature sensor, heating/cooling source, wherein between heating/cooling source and applicator roll, be connected to form loop by pipeline, liquid circulates in loop; Temperature sensor connects upper temperature controller, and temperature controller is electrically connected with heating/cooling source.
Be circular, square and other irregular shapes as the through hole interface shape in the applicator roll of a modification of the present invention, can easily process, processing cost is low.
As the through hole interfacial area scope of a modification of the present invention from 1 square centimeter to 1000 square centimeters; When the fluid of different temperatures passes through applicator roll from through hole, play the effect that the temperature of applicator roll is regulated.
Be stainless steel, polytetrafluoroethylene (PTFE), rubber as the pipe material of a modification of the present invention.
It has good heat conductivility to comprise water, NMP, alcohol, gasoline as the liquid of a modification of the present invention.
Temperature sensor as a modification of the present invention is thermocouple sensor and infrared sensor, installs more conveniently, and precision is high.
Slurry temperature in hopper feeds back to temperature controller by temperature sensor, and temperature controller is made the judgement whether regulating according to the difference between actual temperature and target temperature, and the instruction of judgement is sent to heating, cooling source; Heating cooling source receives the order that temperature controller sends and liquid is heated or cooling action; In pipeline liquid to applicator roll, hopper heat, cooling operation, and the temperature of hopper is adjusted to target temperature.
Slurry has certain viscosity, applicator roll generally adopts metal steel material to make, and between applicator roll and contacted slurry, has certain friction, and this friction can produce certain heat, heat can make slurry temperature raise on the one hand, can cause on the other hand the expansion of applicator roll; The temperature of slurry raises, and can make the reduced viscosity of slurry, makes in the situation that doctor roll and coating clearance are constant, and the quality of finally transferring to base material spreading mass by gap reduces, and makes the weight minimizing of coating; The applicator roll expansion causing of absorbing heat brings the gap between paint roller and doctor roll to reduce, and also makes the slurry of transferring on base material by gap reduce, and makes the minimizing of coating quality.In normal coating process, this fricative heat is taken away by slurry and the heat transmission transferred on base material, makes slurry and applicator roll in hopper keep certain temperature, can not cause the variation of coating weight; Halfway in stopping process, in order to keep slurry in the hopper caking that can not dry up, applicator roll will keep the state of operation, the reduced viscosity of slurry and the expansion of applicator roll that heat up and bring like this, and the weight that can cause starting after starting shooting one section of diaphragm is on the low side.
The thermostatic control system of the coupling of transfer coater of the present invention, this temperature control system can ensure the temperature-resistant of slurry in applicator roll and hopper.When occurring starting to shut down, open immediately auto temperature controlled system, monitor the fluctuation of its displays temperature, while reopening coating, close temperature control system and start normal coating.
Brief description of the drawings
Fig. 1 is side view of the present invention;
Fig. 2 is front view of the present invention.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
See Fig. 1-2, the applicator roll 1 of the manhole 2 that it is 50mm that thermostatic control system of the present invention comprises with diameter, 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 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 by pipeline 3 with heating/cooling source 7, and 3 li, pipeline is equipped with can be heated/cooling liquid 4; The probe of temperature sensor 6 is placed in 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 of liquid 4 of pipeline.Temperature sensor 6, temperature controller and heating/cooling device connect by holding wire.The operation principle of thermostatic control system is as follows: temperature sensor 6 detects the change Delta T of slurry temperature in hopper, by signal feedback to temperature controller, temperature controller passes through logical calculated, and send heating or cooling instruction to heating/cooling device, heating/cooling device receives and starts the liquid in pipeline 34 to heat after instruction or cooling, the effect of 3 li of heated/cooling liquid 4 logical heat transfers of pipeline reduces to 0 by the slurry temperature change Delta T in applicator roll 1 and hopper, reaches applicator roll 1 remain unchanged with the slurry temperature in hopper by such Closed control.
Embodiment 1:
By solid matter content be 72%, the viscosity of slurry is 3500mPa.s contains LiCoO
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
2; Between the velocity ratio of adjusting applicator roll 1 and back flow roll and doctor roll and applicator roll 1, the size in gap, is controlled at 280 ± 4mg/1540.25mm by coating weight
2, start normally coating, record the temperature T 1 of slurry; Be coated with after 60 minutes, close back flow roll, stop tape transport, keep applicator roll 1 with identical speed running, start thermostatic control system and record the initial temperature T1 of slurry, and weigh and calculate the dry rear long diaphragm average weight of 20m G1 by automatic weighing system; After 30 minutes, start back flow roll running and start coating, record the temperature T 2 of slurry, and weigh and calculate the rear long diaphragm average weight of the 20m G2 of startup by automatic weighing system.
Embodiment 2:
By solid matter content be 74%, the viscosity of slurry is 4350mPa.s contains LiNiCoMnO
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
2; Between the velocity ratio of adjusting applicator roll 1 and back flow roll and doctor roll and applicator roll 1, the size in gap, is controlled at 296 ± 5mg/1540.25mm by coating weight
2, start normally coating, record the temperature T 1 of slurry; Be coated with after 75 minutes, close back flow roll, stop tape transport, keep applicator roll 1 with identical speed running, start thermostatic control system and record the temperature T 1 of slurry, and weigh and calculate the dry rear long diaphragm average weight of 30m G1 by automatic weighing system; After 60 minutes, start back flow roll running and start coating, record the initial temperature T2 of slurry, and weigh and calculate the rear long diaphragm average weight of the 30m G2 of startup by automatic weighing system;
Embodiment 3:
The cathode size that contains graphite that solid matter content is 45%, the viscosity of slurry is 2200mPa.s is applied on the Cu collector that thickness is 9um according to the mode of scraper transfer coated, and the weight target weight G of coating is set at 135mg/1540.25mm
2; Between the velocity ratio of adjusting applicator roll 1 and back flow roll and doctor roll and applicator roll 1, the size in gap, is controlled at 135 ± 5mg/1540.25mm by coating weight
2, start normally coating, record the initial temperature T1 of slurry; Be coated with after 90 minutes, close back flow roll, stop tape transport, keep applicator roll 1 with identical speed running, start thermostatic control system and record the initial temperature T1 of slurry, and be dried the rear long diaphragm average weight of 10m G1 by weighing and calculating; After 45 minutes, start back flow roll running and start coating, record the initial temperature T2 of slurry, and start the rear long diaphragm average weight of 30m G2 by weighing and calculating;
Comparative example 1:
By solid matter content be 71%, the viscosity of slurry is 3200mPa.s contains LiCoO
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
2; Between the velocity ratio of adjusting applicator roll 1 and back flow roll and doctor roll and applicator roll 1, the size in gap, is controlled at 280 ± 4mg/1540.25mm by coating weight
2, start normally coating, record the initial temperature T1 of slurry; Be coated with after 60 minutes, close back flow roll, stop tape transport, keep applicator roll 1 with identical speed running, do not start thermostatic control system, record the initial temperature T1 of slurry, and weigh and calculate the dry rear long diaphragm average weight of 20m G1 by automatic weighing system; After 30 minutes, start back flow roll running and start coating, record the initial temperature T2 of slurry, and weigh and calculate the rear long diaphragm average weight of the 20m G2 of startup by automatic weighing system;
Comparative example 2:
By solid matter content be 75%, the viscosity of slurry is 4200mPa.s contains LiNiCoMnO
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
2; Between the velocity ratio of adjusting applicator roll 1 and back flow roll and doctor roll and applicator roll 1, the size in gap, is controlled at 296 ± 5mg/1540.25mm by coating weight
2, start normally coating, record the initial temperature T1 of slurry; Be coated with after 75 minutes, close back flow roll, stop tape transport, keep applicator roll 1 with identical speed running, do not start thermostatic control system and record the initial temperature T1 of slurry, and weigh and calculate the dry rear long diaphragm average weight of 30m G1 by automatic weighing system; After 60 minutes, start back flow roll running and start coating, record the initial temperature T2 of slurry, and weigh and calculate the rear long diaphragm average weight of the 30m G2 of startup by automatic weighing system;
Comparative example 3:
The cathode size that contains graphite that solid matter content is 44.5%, the viscosity of slurry is 2350mPa.s is applied on the Cu collector that thickness is 9um according to the mode of scraper transfer coated, and the weight target weight G of coating is set at 135mg/1540.25mm
2; Between the velocity ratio of adjusting applicator roll 1 and back flow roll and doctor roll and applicator roll 1, the size in gap, is controlled at 135 ± 5mg/1540.25mm by coating weight
2, start normally coating, record the initial temperature T1 of slurry; Be coated with after 90 minutes, close back flow roll, stop tape transport, keep applicator roll 1 with identical speed running, do not start thermostatic control system, record the initial temperature T1 of slurry, and by weighing and calculating the dry rear long diaphragm average weight of 10m G1; After 45 minutes, start back flow roll running and start coating, record the initial temperature T2 of slurry, and start the rear long diaphragm average weight of 30m G2 by weighing and calculating;
The obtained data of embodiment and comparative example are tabulating as follows:
Can find out from data above, thermostatic control system can ensure in the time that coating machine is out of service that slurry temperature in painting back flow roll, hopper is constant, and the phenomenon that coating weight is not lightened, effectively solve coating and shut down the coating weight abnormal problem causing midway, improve the excellent rate of the pole piece in coating of lithium-ion battery technique, reduced coating apparatus because the outage rate that gravimetric anomaly causes; Improve the quality of lithium-ion electric core simultaneously.
It should be noted that, the announcement of book and elaboration according to the above description, those skilled in the art in the invention can also change and revise above-mentioned embodiment.Therefore, the present invention is not limited to detailed description of the invention disclosed and described above, 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 description, these terms just for convenience of description, do not form any restriction to the present invention.
Claims (6)
1. a process for coating lithium battery, is characterized in that, comprises the following steps:
The first step: the slurry mixing is added in trough of coating machine, adopt the mode of scraper transfer coated that slurry is coated on collector;
Second step: in the time that needs back flow roll shuts down, applicator roll keeps operating condition, starts thermostatic control system simultaneously, keeps the slurry temperature in hopper not change;
The 3rd step: start back flow roll and continue coating;
Described thermostatic control system comprises: with the applicator roll of through hole, and pipeline, liquid, temperature controller, temperature sensor, heating/cooling source, is wherein connected to form loop by pipeline between heating/cooling source and applicator roll, and liquid circulates in loop; Temperature sensor connects upper temperature controller, and temperature controller is electrically connected with heating/cooling source.
2. a kind of process for coating lithium battery according to claim 1, is characterized in that: described through hole interface shape is circular, square or irregular shape.
3. a kind of process for coating lithium battery according to claim 2, is characterized in that: described through hole interfacial area scope is from 1 square centimeter～1000 square centimeters.
4. a kind of process for coating lithium battery according to claim 1, is characterized in that: described pipe material is stainless steel, polytetrafluoroethylene (PTFE), rubber.
5. a kind of process for coating lithium battery according to claim 1, is characterized in that: described liquid comprises any one in water, NMP, alcohol or gasoline.
6. a kind of process for coating lithium battery according to claim 1, 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 |
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| Publication Number | Publication Date |
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| CN102500524A CN102500524A (en) | 2012-06-20 |
| CN102500524B true CN102500524B (en) | 2014-12-10 |
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| CN201110349565.7A Active CN102500524B (en) | 2011-11-08 | 2011-11-08 | Process for coating lithium battery |
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Families Citing this family (7)
| 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 |
| 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 |
| CN109569953A (en) * | 2018-12-14 | 2019-04-05 | 江西明冠锂膜技术有限公司 | Membrane material and lithium electrode plate substrate coating waste water method |
| CN111530694A (en) * | 2020-06-05 | 2020-08-14 | 福建卫东新能源股份有限公司 | Battery sheet coating device |
| CN112151743B (en) * | 2020-09-27 | 2022-06-28 | 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 |
| 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 |
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 |
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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 |
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| CN102500524A (en) | 2012-06-20 |
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