Automatic Vertical Gap Coating Machine For Lithium Battery Electrode Making Or Tape Casting Preparation

I. Brief introduction of whole machine 

Equipment composition: 

1. Unwinding mechanism

2. Coating mechanism

3. Oven mechanism 

4. Traction mechanism

5. Rewinding mechanism

6. Control system

II. Technical parameters of battery electrode

a) Suitable substrate thickness: aluminum foil: 0.010-0.030mm,  copper foil: 0.006-0.030mm;

b) Suitable substrate width: aluminum foil: 300-660mm, copper foil: 300-660mm;

c) Pole piece aluminum / copper foil coil size: core aperture 3 inches;

d) Technical requirements for coating winding up and unwinding: coil diameter ≤ φ 500mm, core diameter 3 inches;

e) Coating slurry characteristics: lithium ion battery positive / negative slurry, viscosity: 1000 ~ 15000cps; after the slurry is fully stirred to meet the requirements of battery coating, it is filled in a running tank and stirred continuously, so as to improve the coating performance of the slurry

f) Coating material system: lithium cobalt oxide, ternary material, lithium iron phosphate, lithium manganate (related to coating drying efficiency and speed); negative carbon graphite system;

g) Single side coating dry thickness (excluding substrate): 50-150 μ m;

h) Maximum wet coating thickness: 100-300um (under the allowable condition of slurry viscosity)

III. Main performance parameters:

Number	Item	Parameter	Remarks
1	Maximum coating speed	≤14m/min	The normal coating speed is related to material system, coating thickness and solid content
2	Speed error coating accuracy	≤0.1m/min
3	Coating machine speed	15m/min
4	Overall length of coater	≤31m
5	Air pressure of equipment air source	≥0.6MPa	Dry, no impurities
6	Single side coating dry thickness error	±2μm	Edge, head and tail are excluded
7	Double side coating dry thickness error	±3.0μm	Except edge, head and tail 8mm
8	Weight error of one side in single chip	±1.5%	Measurement method (Fig. B)
9	Minimum coating length	20mm
10	Minimum length dimension of single piece single segment pole piece	50mm	(one coating plus gap)
11	Minimum length dimension of single-chip double segment electrode	100mm	(two coats plus gap)
12	Single side thickness error of electrode head and tail	+5μm  ~ -10μm
13	Interval coating minimum gap	5mm	Coating speed ≤ 6m / min
14	Accuracy error of coating length	±0.5 mm	Within 800mm
15	Overlap error of front and back coating	±0.5 mm
16	Overlap error of front and back coating edge	±0.5 mm
17	Evenness error of winding edge	±0.5 mm	Φ 400mm large roll

 

Winding / unwinding mechanism

Number	Item	Parameter	Remarks
1	Installation structure	Integral vertical plate installation	Large CNC processing, paint treatment;
2.	Tension control system	Torque control mode: 1. Servo motor drive; 2. Adjustable tension range 0-300n, tension fluctuation ≤ 2%
3.	Rectification method	Automatic correction, accuracy ± 0.5 mm	Ultrasonic testing Stepper motor drive
4.	Substrate operation mode	Forward coating, traction, reverse rewind
5.	Winding / unwinding mode	3-inch inflatable shaft, single shaft winding and unwinding	Pad Shaft The maximum load is 500kg
6.	Winding / unwinding direction	Up and down direction
7.	Winding diameter of winding / unwinding	≤φ500
8.	Aluminum alloy roller	Aluminum alloy roller is used, the surface is hard and oxidized, and the surface hardness is higher than HRC65 Finish Ra 0.4, and make dynamic and static balance treatment;	The roll passing of the whole machine shall be consistent
9.	Control system	Unwinding section setting function operation panel
10.	Wall panel electric box	Paint with the same color as the board,
The rewinding / unwinding mechanism is mainly composed of single axis manual rewinding, automatic tension control, automatic deviation correction and other functions. The traditional passive winding of magnetic powder is abandoned. When controlling the winding tension, the concept of "taper tension" is used, that is, the tension changes gradually during winding, which avoids the phenomenon of winding core pulling caused by loose inside and tight outside. The automatic deviation correction system adopts ultrasonic detection, which is sensitive. The evenness of both sides of the winding is ensured.

 

Coating mechanism

Number	Item	Parameter	Remarks
1.	Coating method	Transfer gap / continuous coating	The servo motor drives the rubber roller to move when the gap is between
2.	Installation structure	Integral vertical plate installation	Large CNC processing, paint treatment;
3.	Adjustment mode of scraper clearance	Servo motor knife adjustment	Number of servo motors: 2 sets
4.	Effective coating width	≤650mm	Base material width ≤ 660mm
5.	Coated steel roll	It has a diameter of φ160mm, circle runout less than 1um, and the surface is plated with hard chromium Servo motor + planetary reducer drive	Special steel, hard chromium plating, no pinhole phenomenon
6.	Coating cot	φ160mm，Circle runout ≤ 10 um Servo motor + planetary reducer drive	Imported EPDM with conductive agent Roll surface finish grinding
7.	Scraper	φ 120mm, scraper straightness ≤ 1um	Special steel, hard chromium plating, NMP corrosion resistance, hollow adjustable roller, double face scraper
8.	Coating tension control	Speed control mode, floating roller up and down control	Precision pressure regulating valve + tension auxiliary cylinder
9.	Abnormal alarm function	Touch screen prompts the cause of failure
10.	Back roll push	Servo motor drive	Number of servo motors: 2 sets
11.	Tank mixing	Cylinder + motor control, can set the stroke and speed freely
12	Counting function	Production quantity / length
13	Controller and human machine interface	10.2 "color touch screen	Easy to operate and maintain
14	Wall panel electric box	Paint with the same color as the board,
·The scraper drives the turbine worm reducer through the servo motor, drives the high-precision screw rod to drive to the inclined block, transmits the up and down movement of the scraper through the horizontal movement of the inclined block and the inclined block, and the clearance adjustment is set through the touch screen, so the operation is convenient. ·The coating steel roll driving servo motor is connected with the steel rod through a double diaphragm coupling. The steel roller bearing adopts high-precision imported bearing. Through unique installation method, it can ensure that the runout after installation is less than 1.0um. The disassembly and assembly of steel roll is simple and convenient for later maintenance. ·Compared with the traditional coating cot mechanism, the driving motor is fixed and connected by double diaphragm coupling, which avoids the influence of motor vibration on coating, ensures the coating accuracy, and avoids the motor and cot moving back and forth together, prolongs the service life of the motor, and reduces the inertia of the cot during inter coating. ·The driving mechanism of the coating cot connects the motor and the cot through a screw rod, which converts the rotary motion of the motor into the forward and backward movement of the cot. The rubber roller seat and motor are installed on the movable sliding block, with fast response and high precision.

Oven mechanism

Number	Item	Parameter	Remarks
1	Heating power of single section oven	18kw / section	Electric heating
2	Oven length	8 sections X3M = 24m
3	Total exhaust air volume of equipment	Centrifugal fan	Inverter control, air volume adjustable
4	Maximum oven temperature	Air volume: 8000m ^ 3 / H ~ 10000 ^ 3 / h	The ambient temperature is 30 ℃, and the temperature accuracy of single section is less than 5 ℃;
5	Oven surface temperature	≤50℃
6	Temperature control accuracy	±3℃	Temperature control meter indication value difference
7	Air supply volume of single section oven	Centrifugal fan Air volume3000m^3/h~4000^3/h	Up and down blowing, frequency control, adjustable air volume.
8	Oven over roll	The active roll is 45# steel roller, and the passive roll is stainless steel roller	Grease free rolling bearing Reduction motor drive
8	Oven drive mode	Section 1.2. The oven is designed to be climbing. The guide roller is the main driving mode. The diameter of the passing roller is 40mm. Section 3.4.5.6.7.8 is placed horizontally. The guide roller is passive.
9	Oven insulation materials, oven materials, thickness, sealing	The oven is made of stainless steel with the thickness of 1.3mm and the shell is made of stainless steel with the thickness of 1.3mm,	The heat preservation material of oven is rock wool, which can effectively insulate heat and keep heat. The thickness of heat insulation layer is 100 mm
10	Oven rack	Profile welding processing, surface painting treatment	Light gray (please provide color plate for special requirements)
l The oven is heated by circulation heating mode, with fast heating and low energy consumption; l The fan is controlled by frequency converter, which can effectively adjust the air volume and pressure of each section of oven;

 

Traction mechanism

Number	Item	Parameter	Remarks
1.	Installation structure	Integral vertical plate installation	Large CNC processing, paint treatment;
2.	tension control	Speed control mode, floating roller up and down control	Precision pressure regulating valve + tension auxiliary cylinder
3.	Traction roller	φ 160mm, circular runout ≤ 20um Reduction motor drive	Imported EPDM with conductive agent Roll surface finish grinding
4.	Tension partition	Press roll pinch mode
5.	Travel correction	Stepper motor drive, deviation correction eye detection
6.	Wall panel electric box	Baking paint treatment
7.	On line detection device	Optional	Installation position reservation
The main function of traction part is to provide power for the operation of substrate. The floating roller structure is adopted to ensure the tension stability of the whole machine. In addition, the tension partition function is set to maintain the tension stability of the base material in the oven.

 

Control system

Number	Name	Brand	Remarks
1	PLC host	OMRON	Japan
2	Digital analog module	OMRON	Japan
3	Frequency converter	LS	The republic of korea
4	Touch screen	Weinview	Domestic
5	Temperature control meter	OMRON	Japan
6	Dial indicator	Precision pointer meter	Domestic
7	Miniature circuit breaker	Schneider	Schneider
9	AC contactor	Schneider	Schneider
10	Modular socket	Schneider	Schneider
11	Intermediate relay	Schneider or OMRON	Germany / Japan
12	Relay base	Schneider or OMRON	Germany / Japan
13	Optical fiber sensor	KEYENCE	Japan
14	Photoelectric switch	OMRON	Japan
15	Cylinder	Adek or qilike	Taiwan
16	Servo motor	Mitsubishi or Panasonic	Japan
17	Head servo motor reducer	Newcastle / Xinbao	Germany / Japan

IV. Site environmental requirements:

1) Ambient temperature: head part 27 ± 3 ℃

2) Relative humidity: the head part is no more than 50 ℅ hr;

3) Compressed air: after drying, filtering and pressure stabilization: the air pressure is more than 5.0kg/cm2; the gas consumption is about 4m3 / h

4) Power supply: three phase 380V, 50 Hz, voltage fluctuation range: + 7% ～ - 7%; maximum power of the equipment is 173kw; (about 60% of the maximum power under normal operation is related to the solid content of slurry, etc.)

5) Ground wire: protective grounding.

6) Ground requirements: the foundation is cement ground or terrazzo ground, with flatness of ± 2mm / m2 and bearing capacity of 1000kg / m2;