Automatic Transfer Coating Machine With Intermittent And Continuous Coating Method For Battery Production

ZL-LB series coater is a professional coating equipment for lithium battery.

1.It is suitable for the coating process of slurry systems such as oily or water-based lithium iron phosphate, oily lithium cobaltic acid, ternary, lithium manganate, nickel cobalt lithium manganate, oily or water-based negative carbon graphite, lithium titanate, etc;

2.The tension control accuracy can reach ±1N level by using the full-automatic PID closed-loop tension control system;

3.The imported standard parts such as OMRON PLC control system and high-precision servo motor are used to ensure the ultra-high consistency and stability of the coated products in terms of surface density and size. The proportion of imported standard parts is as high as 85%.

Specifications

Suitable materials	Oil or water-based lithium iron phosphate, lithium cobalt, lithium manganate, ternary, lithium nickel cobalt manganate, lithium titanate, carbon graphite and other systems
Operating substrate parameters	Aluminum foil: Thickness: 10-30um; Width: 200-620mm; Coil diameter: max.500mm; Weight: max.500kg;   Copper foil: Thickness: 6-30um; Width: 200-620mm; Coil diameter: max.500mm; Weight: max.500kg;
Design width of roller	650 mm
Effective coating width	200~580mm
Mechanical operation speed of equipment	12m/min
Coating speed	0.5-8m/min
Suitable material viscosity	2000~12000 Cps
Single side coating dry thickness range	50-150μm
Minimum intermittent length	5mm
Minimum coating length of multi-stage	20mm
Solvent properties	Oily solvent: NMP(s.g=1.033,b.p=204℃) Aqueous solvent: H2O/NMP(s.g=1.000,b.p=100℃)
Suitable solid content	Anode: S．C. 60%±20% Cathode: S．C. 50%±10%(PVDF system) S．C. 50%±5%（SBR system）
Relative density	Anode: 1.5—2.59/cm2 Cathode: 1～1.89/cm2
Coating method	Double layer double side 3-stage unequal distance intermittent transfer coating / second side automatic tracking / continuous transfer coating
Roll change mode	manual
Base material running direction	Forward coating, substrate forward and reverse empty foil operation

Machine structure

1. Unwinding mechanism (single arm manual rewinding)

The unwinding part mainly has three functions: active unwinding, real-time automatic correction and automatic tension control;

The active unwinding is powered by the motor through the synchronous pulley, and the unwinding speed is determined according to the real-time change of tension and coating speed. The whole process runs automatically to ensure the perfect matching of unwinding speed and coating speed. It avoids the large fluctuation of tension caused by the non-linear power output of the magnetic powder which can not control the unwinding speed in real time and actively when the conventional magnetic powder is passively unwinding, which affects the coating speed.

Installation structure of roller	Integral vertical plate installation (thickness 30mm)
Roller surface treatment	Oxidation treatment of aluminum roll surface, the surface hardness is HRC65, the run out of roll is ≤ 20 μ m, the surface roughness is Ra0.8, the parallelism is ≤ 0.1mm;
Tension control system	Full automatic PID closed-loop control constant tension; unwinding tension range: 0~50N; tension control accuracy ± 1N;
Correction method	Automatic EPC control, stroke 120mm
Winding method	Uncoiling in up and down direction The coil is fixed with 3-inch inflatable shaft and inflatable shaft Unwinding single inflatable shaft, double-sided support Manual splicing platform, double compression bar mode
Substrate running direction	forward and backward
Substrate running speed	12m/min
Maximum unwinding diameter	Ф500mm
Maximum bearing capacity of inflatable shaft	500Kg
Number of unwinding inflatable shafts	1
Control system	Set the function operation button, which can complete the operation of tape extension, pause, emergency stop, forward and reverse, left and right alignment, etc
Unwinding speed	The unwinding speed is controlled by PLC according to the set coating speed and real-time tension change data; the unwinding power is provided by AC motor + turbine reducer;

2.Coating mechanism

The head of the machine is mainly composed of scraper mechanism, steel roller mechanism, rubber roller mechanism and rubber roller drive.

·The scraper mechanism drives the high-precision screw rod to drive to the inclined block through the worm reducer, and transfers to the up and down movement of the scraper through the horizontal movement of the inclined block and the inclined block, which makes the adjustment accuracy more accurate, easier to control, and greatly reduces the reverse clearance.

·The steel roller mechanism is connected with the steel rod through the double diaphragm coupling through the servo motor. The steel roller bearing adopts high-precision imported bearing, which ensures the runout below 1.5um after installation through unique installation method.

·Compared with the traditional rubber roller mechanism, the driving motor is fixed, and the soft connection of the double diaphragm coupling avoids the influence of the motor vibration on the coating, ensures the coating accuracy, avoids the motor and the rubber roller moving back and forth together, prolongs the service life of the motor, and reduces the inertia of the rubber roller during the coating.

·The rubber roller driving mechanism connects the motor and the rubber roller through the screw rod, and converts the rotation movement of the motor into the front and back movement of the rubber roller. The rubber roller seat and the motor are installed on the movable slide block, with fast response and high precision.

Installation structure	50 mm thick overall vertical plate structure, 1 ton overall weight
Main drive motor	Servo motor (750W)
Intermittent push motor	Servo motor (750W)
Roller surface treatment	The surface of aluminum roll is oxidized, the surface hardness is HRC65, the run out of roll is ≤ 20 μ m, the surface roughness is Ra0.8, the parallelism is ≤ 0.1mm;
Reducer	100:1 with 750W reducer
Scraper structure	Double sided comma scraper, electroplated, outer diameter Φ 128mm,
Blade angle rotation control	Handle rotation
Coating roller (steel roller)	The surface is plated with imported hard chromium, with a diameter of 128mm;
Tension	Full automatic PID closed-loop control constant tension, tension range 0 ~ 50N, tension control accuracy ± 1n
Back roll	160mm diameter, imported EPDM for surface bread, fine grinding for roll surface
Trough mixing	Straight movement of rodless cylinder, adjustable speed
Baffle plate	Saigang material, sealed with styrofoam, equipped with special knife mould
Blade intermittent height adjustment	Servo motor adjustment: set the intermittent size of scraper and steel roller on the touch screen, with the minimum adjustment size of 0.1um
Stand alone head position	Installation and operation before drying

3.Drying mechanism(infrared heating + electric heating of stainless steel heating tube)

 

In the drying part, the fan is controlled by the frequency converter to supply air to the oven, which is heated by the electric heater before entering the oven. And equipped with hot air recycling function, effectively reducing the cost of use. Because the frequency converter is used to control the air supply motor, the air volume regulation is convenient. The fan is made of stainless steel and durable.

Oven structure	Single layer independent heating, up and down arrangement, the first two heating ovens adopt the up and down independent heating bag heating mode, the second two heating ovens adopt the common heating bag heating mode.
First 2 auxiliary heating	The infrared auxiliary heating structure is adopted to prevent the cracking in the heating process and accelerate the drying speed.
Oven length	12m (3m / section, 4 sections in total)
texture of material	Stainless steel, internal container national standard SUS304 (1.0mm), external container national standard SUS201 (1.2mm)
Driving mode of oven guide roller	All guide rollers are mainly driven by servo motor with diameter of Φ 60mm and surface plated with hard chromium; the first and second guide rollers are in ascending arc distribution, the third and fourth guide rollers are in descending arc distribution with total drop of 200mm.
Temperature control	It is divided into normal working temperature control and protection control of over temperature monitoring alarm. When the temperature is over, an audible and visual alarm will appear, and the main heating power supply will be cut off; each section is completely controlled independently
Heating mode	Infrared heating + stainless steel heating pipe electric heating, hot air circulation structure
Heating power of single section oven	Front 2 sections 22KW * 3M, rear 2 sections 18kw * 3M
Temperature in oven	Design Max150 ℃, temperature difference in single section oven ≤ 5 ℃
Surface temperature of box during operation	≤45℃
Blowing method	Upper and lower air blowing, the upper and lower air volume are respectively controlled by the valve, which can be fine adjusted; the upper and lower air chambers share the heating body
Exhaust air volume control of each section	Through mechanical valve, independent control, fine tuning
Nozzle structure	The blowing direction is 30 degrees to the horizontal, and the air nozzle groove is slotted with a special mold
Fan control	AC contactor control
Heating control	Solid state relay
Fan material	National standard SUS304 stainless steel
Blowing capacity of each section (3m)	4500m3 / h, pressure: 550pa at rated speed
Exhaust volume (two in total)	10000m3 / h, pressure: 600Pa at rated speed
Solvent recovery system	No, only interface installation
NMP solvent concentration alarm	None (this function needs to be quoted separately)
Air chamber pressure monitoring	None (this function needs to be quoted separately)
Exhaust air volume	100-350 m3 / min