CN115318573B - Coating device and coating method for lithium battery electrode plate - Google Patents
Coating device and coating method for lithium battery electrode plate Download PDFInfo
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- CN115318573B CN115318573B CN202210959846.2A CN202210959846A CN115318573B CN 115318573 B CN115318573 B CN 115318573B CN 202210959846 A CN202210959846 A CN 202210959846A CN 115318573 B CN115318573 B CN 115318573B
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- 238000000576 coating method Methods 0.000 title claims abstract description 79
- 239000011248 coating agent Substances 0.000 title claims abstract description 68
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 26
- 239000000428 dust Substances 0.000 claims abstract description 69
- 239000002002 slurry Substances 0.000 claims abstract description 45
- 238000003860 storage Methods 0.000 claims abstract description 30
- 239000004020 conductor Substances 0.000 claims description 27
- 230000003068 static effect Effects 0.000 claims description 20
- 239000007788 liquid Substances 0.000 claims description 18
- 239000007791 liquid phase Substances 0.000 claims description 6
- 239000012717 electrostatic precipitator Substances 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 239000011267 electrode slurry Substances 0.000 claims description 2
- 238000005367 electrostatic precipitation Methods 0.000 claims 2
- 230000007547 defect Effects 0.000 abstract description 16
- 238000000034 method Methods 0.000 abstract description 6
- 238000003756 stirring Methods 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 8
- 230000005611 electricity Effects 0.000 description 6
- 239000011521 glass Substances 0.000 description 4
- 238000005054 agglomeration Methods 0.000 description 3
- 230000002776 aggregation Effects 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 210000000170 cell membrane Anatomy 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000006256 anode slurry Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006257 cathode slurry Substances 0.000 description 1
- 210000004027 cell Anatomy 0.000 description 1
- 239000006258 conductive agent Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000007581 slurry coating method 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
- 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
-
- 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
- B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
- B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
- B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
- B05C1/0826—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets
- B05C1/083—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets being passed between the coating roller and one or more backing rollers
-
- 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
- B05C11/1042—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material provided with means for heating or cooling the liquid or other fluent material in the supplying means upstream of the applying apparatus
-
- 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
- B05C11/11—Vats or other containers for liquids or other fluent materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B6/00—Cleaning by electrostatic means
-
- 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
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention discloses a coating device for electrode plates of a lithium battery, which comprises a coating roller, a back roller, a trough, a feeding device, an oil removing assembly and an electrostatic dust removing assembly, wherein the oil removing assembly comprises a vibrating device and an oil absorbing device which are arranged at two sides of a current collector, the electrostatic dust removing assembly is arranged at the coating side of the current collector, the feeding device comprises a storage tank and a material absorbing pump, a vacuum bubble removing tank is arranged between the storage tank and the material absorbing pump, and the top of the vacuum bubble removing tank is communicated with a vacuum pump. According to the invention, oil stains and partial dust on the surface of the current collector are separated by the ultrasonic vibration current collector and are sucked by the oil suction groove, and the dust is further removed by an electrostatic suction mode, so that the defects of shrinkage holes and pinholes can be effectively avoided, most of bubbles in the slurry are removed by a vacuum bubble removal mode, and the generation of agglomerates can be reduced by continuously stirring by the stirrer. The invention also provides a method for coating the electrode plate by adopting the device.
Description
Technical Field
The invention relates to the technical field of lithium battery electrodes, in particular to a coating device and a coating method for a lithium battery electrode plate.
Background
In the production process of the lithium battery, the manufacturing of the electrode plate occupies an important position, and about 70% of the quality problems of the lithium battery are related to the quality of the electrode plate according to statistics. The manufacturing process of the lithium battery electrode plate comprises the working procedures of slurry mixing, coating, drying, rolling, cutting and the like, wherein common defect types of the electrode plate are aggregates, shrinkage cavities, pinholes, scratches, stripes and the like caused by uneven coating.
Among the above defects, the agglomeration is mainly caused by uneven mixing of the slurry, and the agglomeration of the conductive agent is formed on the surface of the electrode sheet after coating (see fig. 1). In addition, metal powder such as Fe, cu, etc. mixed in the slurry is coated with the slurry, and then agglomerates are formed. Research shows that the agglomerate grains on the surface of the electrode plate can have adverse effects on the voltage and service life of the battery.
Shrinkage cavity defects mainly come from pollution of low-surface tension objects such as oil drops and dust on a base material, so that liquid around the pollutants flows in the direction of high surface tension, and crater-shaped or dimple-shaped shrinkage cavity defects are formed. Pinhole defects are mainly caused by bubble breakage on the surface of a wet film after coating (see figure 2), the thickness of a coating at the pinhole defects is relatively thin, short circuits are easily caused in the charge and discharge processes of a battery, and the vacuum defect of the anode coating also can reduce the rate performance and the cycle performance of the battery.
Patent document 1 discloses a fuel cell membrane electrode coating and feeding device and method, which uses a refrigerant to exchange heat and cool slurry by arranging a low-temperature constant-temperature tank, so that the slurry maintains higher viscosity and lower fluidity, thereby reducing bubble generation and improving coating uniformity.
Patent document 2 proposes a roll coating apparatus for lithium batteries, in which a first cleaning block and a second cleaning block are provided to slide up and down, so as to squeeze air bubbles in slurry accumulated in the vicinity of the outer circumferential surface of a back roller and the outer circumferential surface of a coating roller, and the slurry is vibrated by the cleaning blocks, so that the air bubbles in the slurry are easily discharged, and air bubbles generated by air entrainment are reduced.
Patent document 3 proposes a coating operation system for producing and manufacturing lithium batteries, in which an internal stirring mechanism and an exhaust bubble module are provided to break bubbles generated during slurry stirring by an air pressure difference.
The solution disclosed in the above patent document can solve most of the air bubbles generated during the slurry stirring and coating process, but no targeted solution is provided for the agglomeration and shrinkage cavity defects, which cannot be avoided.
Prior art literature:
patent document 1: CN202010668262.0 fuel cell membrane electrode coating and feeding device and method
Patent document 2: CN202010409145.2 roller type coating device for lithium battery
Patent document 3: CN201910861564.7 coating operation system for lithium battery production and manufacturing
Disclosure of Invention
The invention aims at: the coating device for the lithium battery electrode plate can solve the problems of most of aggregates, shrinkage cavities and pinholes in the coating process of the electrode plate, and improves the coating quality.
The technical scheme adopted by the invention is as follows:
the utility model provides a coating device of lithium cell electrode slice, includes coating roller, backing roll, silo, feedway, still includes following structure:
the oil removing assembly comprises a vibrating device and an oil absorbing device which are arranged at two sides of the current collector;
the electrostatic dust collection assembly is arranged on the coating side of the current collector;
the feeding device comprises a storage tank and a suction pump, wherein the storage tank, the suction pump and a trough are communicated through pipelines, a vacuum bubble removal tank is arranged between the storage tank and the suction pump, and the top of the vacuum bubble removal tank is communicated with a vacuum pump.
Preferably, the material sucking pump is communicated with a liquid phase area in the vacuum bubble removing tank, the vacuum bubble removing tank is communicated with a liquid phase area in the storage tank, the upper part of the storage tank is communicated with the outside atmosphere, and a throttle valve is arranged between the storage tank and the vacuum bubble removing tank.
Preferably, a stirrer is arranged on the side face of the vacuum bubble removal tank, and the included angle between the rotating shaft of the stirrer and the horizontal plane is 35-75 degrees.
Preferably, a thickness control roller is arranged on the upper side of the coating roller.
Preferably, the vibration device is an ultrasonic generator, a transducer of the ultrasonic generator is positioned on the upper side of the current collector, and the height of a gap between the transducer and the current collector is not more than 2.5mm;
the oil suction device comprises an oil suction groove and an exhaust device, the oil suction groove is positioned at the lower side of the current collector and is opposite to the transducer, the height of a gap between an opening of the oil suction groove and the current collector is not more than 3mm, and the exhaust device is used for generating negative pressure in the oil suction groove.
Preferably, the electrostatic dust collection assembly includes:
the surface of the electrostatic roller is provided with an insulating layer, and a plurality of conductors are embedded on the surface of the insulating layer along the axial direction;
the output end of the electrostatic generator is connected with a first electric brush through a wire, the first electric brush is in contact with the side edge of the insulating layer, and the first electric brush is positioned on one side, close to the current collector, of the electrostatic roller;
the static eliminator comprises a second electric brush and a grounding end which are connected through a wire, and the second electric brush is contacted with the side edge of the static roller;
the dust collection groove is positioned at the lower side of the electrostatic roller, the opening of the dust collection groove is arc-shaped, the circle center of the arc is positioned on the rotating shaft of the electrostatic roller, the opening of the dust collection groove and the surface of the electrostatic roller keep a gap of 0.5-2.5 mm, and when the dust collection groove works, the internal air pressure of the dust collection groove is lower than the external air pressure;
the static generator, the static eliminator and the dust collection groove are sequentially arranged along the rotation direction of the static roller.
Preferably, the exhaust device is the vacuum pump, and a first valve is arranged between the oil suction groove and the exhaust device.
Preferably, the dust collection groove is communicated with the vacuum pump, a dust filtration box and a second valve are arranged between the dust collection groove and the vacuum pump, and the central angle of the insulating layer contacted with the first electric brush is not smaller than 20 degrees.
The invention also provides a coating method of the lithium battery electrode slice, which comprises the following steps:
s1: pouring enough anode or cathode slurry into a storage tank;
s2: starting a vacuum pump to enable the slurry to enter a vacuum defoaming tank, regulating the slurry flow between a storage tank and the vacuum defoaming tank through a throttle valve, completely closing the throttle valve after the slurry with a certain liquid level is in the vacuum defoaming tank, starting a stirrer, and continuously vacuumizing for more than 10 minutes;
s3: opening a throttle valve, and simultaneously starting a suction pump to equalize the slurry flow entering the vacuum defoaming tank and the trough;
s4: after the slurry in the trough reaches a certain liquid level, a coating roller, a back roller, a thickness control roller, an oil removing component and an electrostatic dust removing component are started, a first valve and a second valve are opened, and the slurry is coated on one surface of the current collector after oil removal and dust removal.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:
(1) The feeding device comprises a vacuum bubble removal tank, bubbles in the slurry are removed as much as possible in a vacuumizing mode before the slurry enters the trough, so that pinhole defects are prevented in the coating process, bubbles can be removed while feeding the vacuum bubble removal tank and the trough, and coating does not need to be suspended during bubble removal;
(2) The current collector is vibrated at high frequency through the ultrasonic generator, so that oil drops and dust attached to the surface of the current collector are separated from the surface of the current collector and sucked into the oil suction groove, and air is enabled to flush the surface of the current collector at high speed by controlling the gap between the oil suction groove and the surface of the current collector, and the oil drops and dust separated from the surface of the current collector are brought into the oil suction groove;
(3) The electrostatic dust collection device is provided with an electrostatic dust collection component, a conductor on the surface of the electrostatic roller is periodically charged with static electricity through the electrostatic generator, when the conductor is close to the surface of the current collector, dust attached to the surface of the current collector can be adsorbed by the static electricity, when the conductor is contacted with the second electric brush along with the rotation of the electrostatic roller, the static electricity on the conductor is led into the ground through the electrostatic eliminator, so that the conductor loses the adsorption effect on the dust, the adhesive force between the dust and the surface of the conductor is reduced, and then the dust on the surface of the electrostatic roller is removed through a dust collection groove in a suction mode.
Drawings
Fig. 1 is an image of an electrode sheet agglomerate defect, with a normal electrode sheet surface image on the left and an electrode sheet surface image with an agglomerate defect on the right.
Fig. 2 is an electrode sheet pinhole defect image.
Fig. 3 is a perspective view of example 1.
Fig. 4 is an enlarged view at a in fig. 3.
Fig. 5 is an enlarged view at B in fig. 3.
Fig. 6 is a front view of the oil removal assembly.
Fig. 7 is a front view of an electrostatic precipitator assembly.
Fig. 8 is an enlarged view at C in fig. 7.
Fig. 9 is a front view of embodiment 3, in which a broken line portion is a chassis.
The marks in the figure: 100. a coating roller; 200. a back roller; 300. a trough; 400. a feeding device; 500. an oil removal assembly; 600. an electrostatic dust collection assembly; 700. a current collector; 101. a thickness control roller; 401. a storage tank; 402. a suction pump; 403. a vacuum bubble removal tank; 404. a vacuum pump; 405. a throttle valve; 501. a vibration device; 502. an oil absorbing device; 601. an electrostatic roller; 602. an electrostatic generator; 603. a static eliminator; 604. a dust collection groove; 605. a dust filtering box; 4031. a stirrer; 5011. a transducer; 5021. an oil suction groove; 5022. an exhaust device; 5023. a first valve; 6011. an insulating layer; 6012. a conductor; 6021. a first brush; 6031. a second brush; 6032. a grounding end; 6041. and a second valve.
Detailed Description
For the purpose of making apparent the objects, technical solutions and advantages of the present invention, the present invention will be further described in detail with reference to the accompanying drawings and examples, it being understood that the specific examples described herein are for the purpose of illustration only and are not intended to limit the present invention.
Example 1
As shown in fig. 3 to 8, the present embodiment discloses a coating device for a lithium battery electrode sheet, which is used for a coating process of the lithium battery electrode sheet, and the coating device includes a coating roller 100, a back roller 200, a trough 300, a feeding device 400, an oil removal assembly 500, and an electrostatic dust removal assembly 600, wherein:
the feeding device 400 comprises a storage tank 401 and a suction pump 402, wherein the storage tank 401, the suction pump 402 and a trough 300 are communicated through pipelines, a vacuum bubble removing tank 403 is arranged between the storage tank 401 and the suction pump 402, the top of the vacuum bubble removing tank 403 is communicated with a vacuum pump 404, negative pressure is generated at the top of the vacuum bubble removing tank 403 through the vacuum pump 404, the internal pressure of bubbles in slurry is larger than the external pressure to expand, the buoyancy of the expanded bubbles is increased and is easy to float to the surface of the slurry, so that the effect of removing the bubbles in the slurry is realized, the suction pump 402 is communicated with a liquid phase area in the vacuum bubble removing tank 403, an outlet of the suction pump 402 is communicated with the trough 300, the vacuum bubble removing tank 403 is communicated with the liquid phase area in the storage tank 401, the upper part of the storage tank 401 is communicated with the external atmosphere, the slurry in the storage tank 401 is continuously pumped into the vacuum bubble removing tank 403 under the effect of the suction pump 402 and the vacuum pump 404, a throttle valve 405 is arranged between the storage tank 401 and the vacuum bubble removing tank 403, and the vacuum bubble removing tank 403 is used for controlling the flow rate of the slurry flowing from the storage tank 401 to the vacuum bubble removing tank 403.
When feeding the trough 300 by the suction pump 402, the rotation speed of the suction pump 402 and the opening of the throttle valve 405 should be adjusted to keep the slurry flow rate entering the trough 300 and the slurry flow rate leaving the storage tank 401 consistent, in this embodiment, the objective is achieved by observing the liquid level of the bubble removal tank 403, specifically, a pressure-resistant glass window is provided on the side of the bubble removal tank 403 to facilitate the observation of the liquid level, and the rotation speed of the suction pump 402 and the opening of the throttle valve 405 are adjusted according to the elevation of the liquid level.
Further, a liquid level scale can be arranged on the pressure-resistant glass window on the side surface of the vacuum bubble removal tank 403, so that comparison is facilitated, and the change of the liquid level is recorded.
In other embodiments, a flow meter may be disposed on the pipeline where the suction pump 402 and the throttle valve 405 are located instead of the pressure-resistant glass window, which has the advantages of stronger tightness of the vacuum bubble removal tank 403 and easier achievement of high vacuum to improve the bubble removal effect, and the disadvantage that the actual liquid level of the vacuum bubble removal tank 403 cannot be observed.
The side of vacuum removes bubble jar 403 is equipped with agitator 4031, and agitator 4031's pivot and horizontal angle are 50, can make the thick liquids in the vacuum remove bubble jar 403 mix in the horizontal direction, can also make the thick liquids mix from top to bottom simultaneously, for traditional vertical agitator that sets up, can avoid the thick liquids to take place layering, the circumstances of subsidence from top to bottom in the stirring in-process, can obviously reduce the production of aggregate in actual production.
In other embodiments, the included angle between the rotation axis of the stirrer 4031 and the horizontal plane may be any value between 35 ° and 75 °, which can achieve a better mixing effect.
The oil removing assembly 500 includes a vibration device 501 and an oil absorbing device 502 disposed at two sides of the current collector 700 to remove residual oil on the coating surface of the current collector 700, wherein:
the vibration device 501 is an ultrasonic generator, the transducer 5011 of the ultrasonic generator is located on the upper side of the current collector 700, the height of the gap between the transducer 5011 and the current collector 700 is not more than 2.5mm to reduce energy attenuation, the length of the transducer 5011 is slightly larger than the width of the current collector 700, meanwhile, the working frequency of the vibration device 501 is not less than 20kHz, specifically, in the embodiment, the height of the gap between the transducer 5011 and the current collector 700 is 1.5mm, and the working frequency of the vibration device 501 is 22kHz;
the oil suction device 502 comprises an oil suction groove 5021 and an exhaust device 5022, the oil suction groove 5021 is located at the lower side of the current collector 700 and is opposite to the transducer 5011, the height of a gap between an opening of the oil suction groove 5021 and the current collector 700 is not more than 3mm, in the embodiment, the height of the gap is 1mm, the exhaust device 5022 is used for generating negative pressure in the oil suction groove 5021, the width of the oil suction groove 5021 is slightly smaller than the width of the current collector 700 but larger than the slurry coating width on the current collector 700, so that the current collector 700 can completely cover the opening of the oil suction groove 5021, and the coating area of the current collector 700 is fully cleaned.
The oil removing assembly 500 makes the current collector 700 vibrate at high frequency through the ultrasonic wave emitted by the transducer 5011, so that oil drops and part of dust on the surface of the current collector 700 are separated from the attached state, and the air flow generated by the oil absorbing device 502 is brought into the oil absorbing groove 5021, so that not only oil can be removed, but also part of dust attached to the surface of the current collector 700 in a weak manner can be removed.
The current collector 700 is generally cleaned before being coated, and the surface of the current collector has fewer oil drops, which cannot affect the normal operation of the exhaust device 5022, so that the oil drops removed do not need to be collected in the oil suction tank 5021 and the exhaust device 5022 in the embodiment.
The electrostatic precipitator assembly 600 is disposed on the coating side of the current collector 700, and is configured to substantially remove dust on the coating surface of the current collector 700, and includes:
the electrostatic roller 601, the electrostatic roller 601 is disposed on the coating side of the current collector 700, an insulating layer 6011 is disposed on the surface of the electrostatic roller 601, a plurality of conductors 6012 are inlaid on the surface of the insulating layer 6011 along the axial direction, in this embodiment, the insulating layer 6011 is quartz glass, the conductors 6012 are copper sheets, the conductors 6012 are uniformly distributed on the surface of the insulating layer 6011, and adjacent conductors 6012 are separated by the insulating layer 6011;
the electrostatic generator 602, the output end of the electrostatic generator 602 is connected with a first electric brush 6021 through a wire, the first electric brush 6021 is contacted with the side edge of the insulating layer 6011, so that static electricity is transferred to a conductor 6012 contacted with the first electric brush 6021 through the first electric brush 6021, the first electric brush 6021 is positioned on one side of the electrostatic roller 601, which is close to the current collector 700, the conductor 6012 passes under the current collector 700 immediately after being electrified, and strong electrostatic adsorption effect is generated on dust attached to the coating surface of the current collector 700, so that the dust is separated from the surface of the current collector 700 and is attached to the conductor 6012;
a static eliminator 603 for eliminating static electricity on the surface of the conductor 6012 to reduce adhesion between dust and the conductor 6012, the static eliminator 603 comprising a second brush 6031 and a ground 6032 connected by a wire, the second brush 6031 being in contact with a side edge of the electrostatic roller 601 to introduce charges carried by the conductor 6012 in contact therewith to the ground;
the dust collection tank 604, the dust collection tank 604 is located at the lower side of the electrostatic roller 601, the opening of the dust collection tank 604 is arc-shaped, the center of the arc is located on the rotating shaft of the electrostatic roller 601, the opening of the dust collection tank 604 and the surface of the electrostatic roller 601 keep a gap of 0.5-2.5 mm, in this embodiment, the height of the gap is 1.5mm, when the dust collection tank 604 works, the internal air pressure is lower than the external atmospheric pressure, the gap between the opening of the dust collection tank 604 and the surface of the electrostatic roller 601 does not affect the rotation of the electrostatic roller 601, and the gap can generate high-speed air flow to scour the surface of the electrostatic roller 601, so that dust is separated from the surface of the electrostatic roller and enters the dust collection tank 604 along with the air flow, in particular, the internal air pressure of the dust collection tank 604 is lower than the external atmospheric pressure through the vacuum pump.
The first brush 6021, the second brush 6031 and the dust collection groove 604 are sequentially arranged along the rotation direction of the electrostatic roller 601, so that when the conductor 6012 rotates along with the electrostatic roller 601, the conductor 6012 is firstly electrified by contact with the first brush 6021, then dust is adsorbed below the current collector 700, then the conductor is contacted with the second brush 6031 to remove static electricity, the adhesion force between the dust and the conductor 6012 is reduced, and finally the dust on the surface of the conductor 6012 is removed by dust collection through the dust collection groove 604.
In this embodiment, in order to simplify the device structure, the exhaust device 5022 is a vacuum pump 404, a first valve 5023 is disposed between the oil suction tank 5021 and the exhaust device 5022, meanwhile, the dust suction tank 604 is also communicated with the vacuum pump 404, and a dust filtering box 605 and a second valve 6041 are disposed between the dust suction tank 604 and the vacuum pump 404.
The central angle of the insulating layer 6011 in contact with the first brush 6021 is not less than 20 °, so that the first brush 6021 can continuously charge the plurality of conductors 6012, and the conductor closest to the current collector 700 should be in a charged state, which is 50 ° in this embodiment.
To prevent discharge between the conductor 6012 and the current collector 700, the maximum operating voltage of the electrostatic generator 602 is limited, and the maximum operating voltage of the electrostatic generator 602 depends on the minimum distance between the electrostatic roller 601 and the current collector 700, and should satisfy the following relationship:
V＝μ·d，
v, maximum operating voltage of the electrostatic generator 602;
d, minimum spacing of electrostatic roller 601 from current collector 700 in mm;
mu, the voltage coefficient takes any value between 500 and 1000 and the unit is kV/mm.
In this embodiment, d is 2mm, mu is 800kV/mm, and the maximum operating voltage of the electrostatic generator 602 is 1600V.
Meanwhile, the minimum operating voltage of the electrostatic generator 602 should not be less than 60% of its maximum operating voltage, and it is difficult to maintain a good adsorption effect at too low a voltage.
The coating device in this embodiment further includes a frame for mounting the above structure, in which the coating roller 100, the back roller 200, and the electrostatic roller 601 are rotatably mounted, and the transducer 5011 and the dust suction tank 604 are fixedly mounted on the frame, and the frame is further provided with a driving device for driving the coating roller 100, the back roller 200, and the electrostatic roller 601 to rotate.
Example 2
The embodiment provides a coating method of a lithium battery electrode slice, which is realized based on the coating device in embodiment 1, and comprises the following steps:
s1: pouring a sufficient amount of positive or negative electrode slurry into the storage tank 401;
s2: starting a vacuum pump 404, enabling slurry to enter a vacuum bubble removal tank 403, regulating the slurry flow between a storage tank 401 and the vacuum bubble removal tank 403 through a throttle valve 405, observing the liquid level of the vacuum bubble removal tank 403 through a pressure-resistant glass window, completely closing the throttle valve 405 after the slurry liquid level in the vacuum bubble removal tank 403 reaches 1/3-1/2, starting a stirrer 4031, continuously vacuumizing for more than 10 minutes, and fully removing bubbles in the slurry;
s3: opening a throttle valve 405, starting a suction pump 402 at the same time, and adjusting the flow rate of the suction pump 402 and the opening of the throttle valve 405 to make the flow rate of slurry entering the vacuum defoaming tank 403 and the trough 300 equal;
in this step, the consumption speed of the slurry can be calculated according to the line speed of coating, the coating width and the thickness, and the flow of the suction pump 402 can be adjusted accordingly, so that the flow of the suction pump 402 does not need to be adjusted again according to the consumption speed of the slurry when coating is performed, or fine adjustment is only needed according to the liquid level change of the trough 300;
s4: after the slurry in the trough 300 reaches a certain liquid level, the coating roller 100, the back roller 200, the thickness control roller 101, the oil removing component 500 and the electrostatic dust removing component 600 are started, the first valve 5023 and the second valve 6041 are opened, and the slurry is coated on one surface of the current collector 700 after oil removal and dust removal.
After being coated and dried by the coating method of the embodiment, the coating quality of the coated and dried electrode slice coating surface is detected on line by a coating detector, and the number of agglomerate defects of the electrode slice coating surface is less than 10 parts/m after statistics 2 The number of shrinkage defects is lower than2/m 2 The pinhole defect number is lower than 16 parts/m 2 The above values are all average values, and the total length of the electrode sheet measured is not less than 100m, the width is 0.6m, and the width of the coating area is 0.59m.
Example 3
In order to make the thickness of the slurry on the surface of the current collector 700 more uniform, this embodiment is further improved on the basis of embodiment 1, specifically, a thickness control roller 101 is disposed on the upper side of the coating roller 100, so that the coating roller 100 and the thickness control roller 101 form a slit, and when the slurry carried out from the trough 300 by the coating roller 101 passes through the slit, the slurry layer on the surface of the coating roller 101 is kept uniform under the trowelling effect of the thickness control roller 101.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (8)
1. The utility model provides a coating device of lithium cell electrode slice, includes coating roller (100), backing roll (200), silo (300), feedway (400), its characterized in that still includes following structure:
the oil removing assembly (500), wherein the oil removing assembly (500) comprises a vibration device (501) and an oil suction device (502) which are arranged at two sides of the current collector (700);
the vibration device (501) is an ultrasonic generator, a transducer (5011) of the ultrasonic generator is positioned on the upper side of the current collector (700), and the height of a gap between the transducer (5011) and the current collector (700) is not more than 2.5mm;
the oil suction device (502) comprises an oil suction groove (5021) and an exhaust device (5022), the oil suction groove (5021) is positioned at the lower side of the current collector (700) and is opposite to the transducer (5011), the height of a gap between an opening of the oil suction groove (5021) and the current collector (700) is not more than 3mm, and the exhaust device (5022) is used for generating negative pressure in the oil suction groove (5021);
an electrostatic precipitation assembly (600), the electrostatic precipitation assembly (600) being disposed on a coating side of a current collector (700);
the electrostatic precipitator assembly (600) comprises:
an insulating layer (6011) is arranged on the surface of the electrostatic roller (601), and a plurality of conductors (6012) are inlaid on the surface of the insulating layer (6011) along the axial direction;
the electrostatic generator (602), the output end of the electrostatic generator (602) is connected with a first electric brush (6021) through a wire, the first electric brush (6021) is contacted with the side edge of the insulating layer (6011), and the first electric brush (6021) is positioned on one side, close to the current collector (700), of the electrostatic roller (601);
a static eliminator (603), wherein the static eliminator (603) comprises a second brush (6031) and a grounding end (6032) which are connected through wires, and the second brush (6031) is contacted with the side edge of the static roller (601);
the feeding device (400) comprises a storage tank (401) and a suction pump (402), wherein the storage tank (401), the suction pump (402) and the trough (300) are communicated through pipelines, a vacuum bubble removal tank (403) is arranged between the storage tank (401) and the suction pump (402), and the top of the vacuum bubble removal tank (403) is communicated with a vacuum pump (404).
2. The coating device of the lithium battery electrode slice according to claim 1, wherein the suction pump (402) is communicated with a liquid phase area in the vacuum bubble removal tank (403), the vacuum bubble removal tank (403) is communicated with a liquid phase area in the storage tank (401), the upper part of the storage tank (401) is communicated with the outside atmosphere, and a throttle valve (405) is arranged between the storage tank (401) and the vacuum bubble removal tank (403).
3. The coating device of a lithium battery electrode sheet according to claim 1 or 2, wherein a stirrer (4031) is arranged on the side surface of the vacuum bubble removal tank (403), and the included angle between the rotating shaft of the stirrer (4031) and the horizontal plane is 35-75 degrees.
4. A coating device for lithium battery electrode sheets according to claim 3, characterized in that the upper side of the coating roller (100) is provided with a thickness control roller (101).
5. The coating apparatus of a lithium battery electrode sheet according to claim 4, wherein the electrostatic precipitator assembly (600) further comprises:
the dust collection groove (604), the dust collection groove (604) is positioned at the lower side of the electrostatic roller (601), the opening of the dust collection groove (604) is arc-shaped, the circle center of the arc is positioned on the rotating shaft of the electrostatic roller (601), the opening of the dust collection groove (604) and the surface of the electrostatic roller (601) keep a gap of 0.5-2.5 mm, and when the dust collection groove (604) works, the internal air pressure is lower than the external air pressure;
the static generator (602), the static eliminator (603) and the dust collection groove (604) are sequentially arranged along the rotation direction of the static roller (601).
6. The coating device for the lithium battery electrode slice according to claim 5, wherein the exhaust device (5022) is the vacuum pump (404), and a first valve (5023) is arranged between the oil suction groove (5021) and the exhaust device (5022).
7. The coating device for the electrode sheet of the lithium battery according to claim 6, wherein the dust collection groove (604) is communicated with the vacuum pump (404), a dust filtration box (605) and a second valve (6041) are arranged between the dust collection groove (604) and the vacuum pump (404), and the central angle of the insulating layer (6011) contacted with the first electric brush (6021) is not less than 20 degrees.
8. A coating method of a coating device based on the lithium battery electrode sheet according to claim 7, characterized by comprising the following steps:
s1: pouring a sufficient amount of positive or negative electrode slurry into a storage tank (401);
s2: starting a vacuum pump (404) to enable slurry to enter a vacuum bubble removal tank (403), regulating the slurry flow between a storage tank (401) and the vacuum bubble removal tank (403) through a throttle valve (405), completely closing the throttle valve (405) after the slurry with a certain liquid level in the vacuum bubble removal tank (403), starting a stirrer (4031), and continuously vacuumizing for more than 10 minutes;
s3: opening a throttle valve (405), and simultaneously starting a suction pump (402) to equalize the slurry flow entering a vacuum defoaming tank (403) and a trough (300);
s4: after the slurry in the trough (300) reaches a certain liquid level, a coating roller (100), a back roller (200), a thickness control roller (101), an oil removing component (500) and an electrostatic dust removing component (600) are started, a first valve (5023) and a second valve (6041) are opened, and the slurry is coated on one surface of the current collector (700) after oil removal and dust removal.
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| CN103290726A (en) * | 2013-05-29 | 2013-09-11 | 轻工业杭州机电设计研究院 | Adhesive applicator/coater |
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