Automatic Double Sided Extrusion B-Type Coating Machine For Lithium Battery Production Line

Automatic Double Sided Extrusion B-type Coating Machine for Lithium Battery Production Line

Basic functions of the device

This equipment is used to unwind and transport the substrate to the coating mechanism throughthe unwinding mechanism. The slurry is smoothly transported to the coating extrusion die under a certain pressure through the feeding system. The slurry is sprayed onto a single side of the substrate (copper or aluminum foil) through the extrusion grinding lip. The coated substrate and slurry are pulled by the device driving mechanism to the drying box for drying. The dried material is then driven and rolled back. Single sided coating, tandem double-sided coating machine.

Characteristics of the equipment

1. Digital tension: The unwinding, rear drive, and rewinding tension can be digitally set on the touchscreen, and the results of the three tension segments can be displayed simultaneously on the touch screen. The adjustment of tension is very convenient, and the smoothness of baseband operation can be clearly understood on the touch screen.

2. Servo with brake: The servo motor with distance control between the mold head and the base wheel is added to the brake, which can eliminate changes in the power-off time distance, thereby reducing the adjustment time.

3. Interrupt control: All places that require speed in a timely manner adopt interrupt control. The result of interrupt control reduces the error in coating length and alignment.

4. Strip coating: Adopting a custom mold head instead of a standard mold head to reduce slurry loss caused by gasket chamfering, making it easy to operate. For strip coating, the edge thickness can be adjusted according to user requirements.

5. Dynamic filtration system: With a special filter structure, it can effectively filter out various impurities and is suitable for liquids of various viscosities. The equipment has good reliability, long maintenance cycles, and low maintenance costs. Compact structure and small footprint. Large filtration capacity per unit area, strong processing capacity, and can be filtered at multiple levels

Hardware and functional description of the device

1. Feeding system: low-speed running slurry mixing tank+Japanese Bing Shen servo pump+servo motor drive+stainless steel pipeline. The main function is to dynamically store and smoothly transport slurry to the filtration system, ensuring that the slurry remains constant at a certain temperature.

2. Filtering system: The core technology of the I series (external scraper type) continuous scraper filter lies in its filter screen and scraper assembly. Each wire cross-section of this wedge-shaped filter screen is triangular, and the outer wall of the filter screen is smooth, which is beneficial for the scraper to remove impurities attached to it. The outside of the filter screen has a triangular opening, so that debris smaller than or equal to the required filtering accuracy will not get stuck on the filter screen, ensuring that the filter always maintains a good working state. When the scraper scrapes over the outer surface of the filter screen, it smoothly scrapes off the blockage on the surface of the filter screen, ensuring that the filter screen remains unobstructed at all times. The large particles intercepted by the scraper from the surface of the filter screen enter the waste chamber and are discharged regularly.

3. Coating machine: unwinding mechanism+coating mechanism+drying+secondary coating mechanism+rear driving mechanism+automatic winding mechanism. Its main function is to evenly coat the slurry on the substrate (copper foil and aluminum foil), dry it, and then wind it up.

Software and Function Description

1. The frequency converter and temperature controller both adopt communication control mode, and all fan frequency regulation and temperature setting can be centrally completed on the touch screen, without the need to open the control cabinet for adjustment.

2. The coating function is displayed and adjusted on the touch screen

3. The surface density detection and coating mechanism form a closed-loop control, and the data storage and processing are detailed in the description of the surface density detection equipment.

4. The user provides a network on-site, and our company can achieve remote debugging function.

5. MES system interface shall be reserved for the equipment to facilitate the collection and management of production quality data.

6. If the seller's individual equipment involves upstream and downstream process connections, the user needs to adapt to the upstream and downstream equipment.

 Technical specifications

I. Main components of the coating machine：

1. Unwinding mechanism: 1 set

2. Coating mechanism: 2 sets

3. Drying mechanism (double layer): 10 sets

4. Rear drive mechanism: 1 set

5. Winding mechanism (automatic roll changing): 1 set

6. Electrical control system: 1 set

7. Thickness gauge (dry thickness): 1 set

II. Configuration of key equipment components：

No.	Name	Brand	Place of origin
1.	Coating head mechanical components
2.	Coating die head	Ningde Zhongneng	Customized according to customer requirements
3.	Coating roller	40Cr+electroplated hard chromium	Equipped with Japanese NSK bearings
4.	Front drive roller	40Cr+electroplated hard chromium	Equipped with Japanese NSK bearings
5.	Guide roller	Shenyanda Customization (Aluminum Alloy Surface Anodization)	domestic
6.	Coating mechanism guide rail	PMI/TBI	Taiwan
7.	Coating mechanism ball screw	PMI/TBI	Taiwan
8.	Coating roller and front drive roller bearing	NSK/NTN	Japan
9.	Displacement sensor	Panasonic/Delta	Japan
10.	Pneumatic components
11.	Die head propulsion cylinder	SMC	Japan/Taiwan
12.	Electrical proportional valve	SMC	Japan
13.	Pneumatic components	AIRTAC	Taiwan
14.	Motor and reducer
15.	Coating roller and front drive roller servo motor	yaskawa	Japan
16.	Coating roller, front drive reducer	Alpha/Newcastle/Xinbao	Germany/Japan
17.	Reel winding reducer	Liming	Taiwan
18.	Oven roller motor	Liming	Taiwan
19.	Fan	Stainless steel, multi wing low noise	Guangzhou
20.	Deviation correction and tension system
21.	Fully automatic deviation correction (Winding and unwinding and process correction)	Aibo/Yuze/Dongdeng	Shenzhen/Shanghai/Chongqing
22.	Tension sensor (Winding and unwinding, process tension)	Aibo/Yuze	Shenzhen/Shanghai
23.	Electrical components
24.	PLC	Panasonic/Huichuan	Japan/Domestic
25.	PLC digital/analog module	Panasonic/Huichuan	Japan/Domestic
26.	touch screen	HEYTEK/VIRON	Taiwan
27.	Temperature controller	Omron	Japan
28.	Color code sensor	SICK	Germany
29.	inverter	Tai'an/Yaskawa	Taiwan/Japan
30.	miniature circuit breaker	chint	France
31.	contactor	chint	France
32.	Intermediate relay	chint	France
33.	Thickness gauge (dry thickness)	Dual/RUIQI	domestic
34.	NMP concentration alarm	Gastron	Korea
If there are special circumstances, use the same level of brands mentioned above.

III. Usage conditions, basic functions, and technical indicators:

No.	Project	Technical Parameter			Notes
1.	Slurry system and substrate
2.	Suitable for slurry system	1. Positive pole: Lithium iron phosphate, lithium cobalate, lithium manganate, ternary and other oil-based or water-based systems. 2. Negative electrode: oily or water-based systems such as graphite; Super capacitors and related slurry systems.
3.	Suitable for slurry viscosity	Oily solvent 2000-8000 Cps			Intermittent coating
		Aqueous solvent 2000-6000 Cps
		1000~10000 Cps			Continuous coating
	Suitable for solid content of slurry	Positive electrode slurry		35%~75%	PVDF system
		Negative electrode slurry		S.c.30%~65%	PVDF system
				s.c. 30%~65%	SBR system
4.	Solvent characteristics	Oily solvent NMP (s.g=1.033, b.p=204 ℃) Aqueous solvent H2O/NMP (s.g=1.000, b.p=100 ℃)			For reference only
5.	Suitable substrate thickness	Al foil（Al）： 8～30um    Cu foil(Cu)：4.5～30um
6.	Suitable for substrate width	350~670mm
7.	Mechanical characteristic indicators
8.	Design width of roller surface	750mm
9.	Guide roller outside the drying channel	about Ф 120mm aluminum guide roller with hard oxidation on the surface			finish≤0.8
10.	Equipment mechanical operating speed	1-60m/min			Infinitely adjustable
11.	Maximum coating speed	10-35m/min，depending on the slurry system and drying conditions
12.	Full range tension of the entire machine	3~25Kg.f，tension fluctuation±2%
13.	Basic function
14.	Extrusion coating method	Intermittent coating	Front 3 Unequally spaced Intermittent Coating/Back Automatic Tracking Front and Unequally spaced 3 Section Coating
		Continuous coating (including strip coating method)	Infinite length coating
15.	Baseband operation mode	Single sided intermittent	Operation mode during intermittent front coating
		Double sided intermittent	Operation mode during intermittent reverse coating
		Continuous coating	Continuous and uninterrupted coating method
		Wearing straps	The method of uncoating the empty belt
		Rewind	Rewind operation mode during the first test piece inspection
16.	Thickness reduction function	During intermittent coating	Can eliminate thickness at the beginning and end of the coating section
17.	Alarm function	Sound, light, and text alarm	When the device malfunctions, the touch screen prompts the location of the fault and there is an audible and visual alarm
18.	Coating accuracy technical indicators
19.	Coating section length error	± 0.5mm
20.	Width error	± 0.5mm
21.	Positive and negative alignment error	± 0.5mm
22.	Minimum intermittent length	6mm
23.	Minimum coating length for multiple segments	50mm
24.	Single sided coating dry thickness range	40-200μm			Related to material D50
25.	Coating surface density error	±1.3% (Single piece single sided) ±1.2% (two-sided) Remove the influence of poor substrate; But the measured value includes the weight of the substrate;			Excluding edge impact areas Substrate error ≤ 1% (single piece)
26.	Deviation correction accuracy of winding and unwinding	± 0.5mm
27.	Electrical specifications
28.	Source	3~380V/50HZ（Three phase five wire）
29.	Total installed power	1200KKW
30.	Oven heater power consumption	22*50Kw=1100KW Power consumption after constant temperature: less than 660 KW			External electric heating
31.	Compressed air	≮0.6MPa Clean compressed air; Gas consumption：0.5M3/H
32.	Equipment dimensions and weight
33.	External dimensions	Length (11 * 5M+12M+1=68M) * Width (3.5M) * Height (4.5M)
34.	Total weight	About 65 tons

IV.Introduction to the Structure of Each Part：

 1）、Unwinding mechanism： 

Project	Technical Parameter	Notes
1.	Structural method of roller installation	Overall vertical plate installation (thickness 30mm, surface chrome plated) CNC machining.
2.	Drive mode of unwinding shaft	Servo motor+precision planetary reducer drive, clutch switching shaft
3.	Unwinding tension control system	1. Floating roll tension+precision Potentiometer, PID control; 2. Stable tension and digitally adjustable;
4.	Roll out direction	Unwind in a clockwise or counterclockwise direction
5.	Unwinding correction	Automatic EPC control, stroke 80mm, deviation correction controller accuracy ≤ ± 0.5mm	Ultrasonic sensors can recognize transparent films
6.	Winding method	The material roll is fixed with a 3-inch inflatable shaft and supported on both sides	Stop and manually pick up the material
7.	Unwinding diameter	Ф85~Ф500mm
8.	Maximum bearing capacity of inflatable shaft	750Kg/piece
9.	Drum specifications	Length ≤ 720mm, inner diameter approximately 76mm (3 inches)
10.	Number of unwinding inflatable shafts	2 (double axis unwinding)
11.	Receiving platform	1. 4 cylinders/double rod pressure strip, with a scoring groove in the middle of the pressure strip platform; 2. When the belt is running, the pressure bar automatically bounces up, and when the belt is stopped, the pressure bar automatically falls down.

2）、Coating machine head structure： （2 sets, 1 set at the entrance of the lower oven, and 1 set at the entrance of the upper oven）

Turnover tank, dynamic filter, feeding valve

3）、Drying channel (double layer layout design)

Industrial Design Reference Drawing for Box Appearance Drawing

7）、Control system：

Industrial Design Reference Drawing for Control Cabinet Appearance Drawing

 9、Appearance color

    Except for the stainless steel part, the color of the paint part will be provided by your company's color card or 2U according to our standard color.

V.Equipment accuracy：

 1、Hardware accuracy

2、  Coating accuracy

   （1）Intermittent coating

Project	Mark	Standard（V=33m/min）
1)  Product accuracy for continuous coating	D (Edge effects area)	≤2mm，-10～+5um（Change in viscosity of slurry＜±300cps）
	F (width error)	±0.2mm
	M (width error)	±0.5mm
	I (vertical alignment error of front and back sides)	≤±0.5mm
	Single sided density error	Weight error≤±1.3%
	Double sided density error	Weight error≤±1.2%
2) Measurement method	A. Measurement area: 5mm away from the edge and end, and 5mm away from the beginning; B. Sampler size: Φ 44mm or according to the process requirements of the purchaser;

（2）Continuous coating

3、Surface density measurement method

A. Measuring instrument: precision electronic scale (0.001g)

B. Measurement area: 6mm away from the edge and end, 10mm away from the beginning

C. Sampling method: Take samples on a coating film with a length of 1000mm and a width of 500-600mm, with 50 sampling points per point Φ 44mm (or according to customer requirements) (5 columns horizontally with a center spacing of 50-100mm, 10 rows vertically with a center spacing of 100mm).

D. Calculation standard: Weigh 50 points separately, and then calculate their standard deviation (STDEV) and average value (AVERAGE). The standard deviation/average value is ± 1.3% (for single side), and ≤ ± 1.2% (for double side coating with a dry thickness of not less than 100um, according to the surface density measurement method in item 3), which is considered qualified (except for special points caused by slurry or substrate reasons).

Note: 1. Acceptance shall be conducted based on a conventional model provided by the user, and the acceptance time shall be determined as 4 consecutive hours of use for testing, or a time specified by the user.

2. Suppliers who do not accept other models are required to provide free technical support and services to meet users' needs, but they are not considered as acceptance criteria.

3. The supplier will also propose some performance and testing requirements for the slurry based on industry experience for user reference.

4、Acceptance conditions and content

Acceptance conditions:

(1) Positive electrode acceptance continuous coating speed 33m/min;

(2) Solid content of slurry: positive electrode ≥ 65%; Negative electrode ≥ 48%;

(3) Single sided dry thickness: 110-120 μ M (including foil);

Acceptance content:

(1) Appearance requirements for the electrode: no scratches, cracks, drying defects, wrinkles, or bulges.

(2) Other requirements comply with the relevant content of this technical agreement.

5、Acceptance materials and usage

(1) Copper and aluminum foil 2000 meters (width and thickness of foil used in normal production)

(2) Slurry: 600KG (total)