Automatic Double Sided B-Type Coating Machine For Lithium Pouch Cell Production 

 Basic functions of the device

This equipment is used to unwind and transport the substrate to the coating mechanism through

the 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：

Turnover tank, dynamic filter, feeding valve

No.	Project	Technical Parameter	Notes
1.	Head installation structure	Overall vertical plate installation (thickness 46mm, surface chrome plated) CNC machining.
2.	Drive connection method	The direct connection method of the motor and reducer makes the drive more stable and reduces the interference of motor vibration on the coating mold and coating roller.
3.	Transmission structure of coating roller and feeding roller	The coating roller and front drive feeding roller are respectively driven by independent servo motors and precision reducers.	Yaskawa Servo, Japan
4.	Extrusion mold push	The left and right propulsion uses cylinders to provide back pressure respectively; The lateral position of the mold is adjusted by the handwheel screw component to adapt to changes in the position of the baseband.	SMC cylinder
5.	Extrusion mold	1. The mold is designed as a combination of upper and lower half molds, with the upper and lower half molds connected by gaskets; 2. The combination mold can adapt to effective coating of various slurries and thicknesses; 3. The design of the mold cavity ensures the stability of the slurry extrusion; 4. The surface roughness of the mold cavity is ≤ Ra0.2 to ensure smooth flow of the slurry. 5. The effective coating width of the mold is 680mm; 6. The straightness of the mold discharge port is ≤ 2um.
6.	Extrusion mold gasket	Positive electrode: one gasket for each of 0.8mm, 1.0mm, and 1.2mm Negative electrode: one shim for each 0.6mm, 0.8mm, and 1.0mm	The thickness and size of the gasket can also be customized according to the process requirements of the purchaser
7.	Coating roller (steel roller)	The surface is plated with hard chromium, with a diameter of 265mm; Hollow structure, Circular runout ≤ 1.5um Straightness ≤ 2um	Tested with a Japanese Mitsubishi dial gauge
8.	Front drive feeding roller (Steel roller+rubber roller)	Drive roller+pinch roller method
9.		Drive roller: diameter Φ 150mm steel roller with hard chromium plating on the surface Pinch roller: diameter Φ 120mm; Surface covered with EPDM	The pinch roller is driven and closed by a cylinder
10.	Guide roller	φ120mm   Anodic oxidation of aluminum alloy surface
11.	Adjustment of gap between mold and coating roller	1. Gap range: 1-2000um; 2. By rotating the screw through a servo motor, the wedge is driven to move, and the mold moves back and forth under the action of the left and right cylinders; 3. By using high-precision displacement sensors to detect the gap size, the left and right gap values are directly displayed on the touch screen, making adjustments faster and more accurate.
12.	Head control screen	Touch screen+button combination operation	The commonly used action is the external button
13.	Coating valve and return valve components	1. The valve body is made of SUS304 stainless steel material, and the internal pipeline is designed with streamline to reduce the resistance of the flow channel; 2. The connection between the two valves and the pipeline is a chuck type quick connect method, which is convenient for disassembly and cleaning; 3. The valve core is driven by a servo motor, ensuring quick opening and closing during coating and cutting;
14.	Dynamic filtration feeding system	1. Stainless steel coating tank+servo Screw pump+dynamic filter (Japanese filter element)+pressure detection+liquid level detection; 2. Coating tank: equipped with low-speed stirring (0-30RPM) to prevent slurry settlement; With interlayer insulation function. Equipped with liquid level detection, it can monitor the current residual material quantity at any time to avoid material shortage during coating; 3. Servo Screw pump: the pulsation free Screw pump driven by servo motor can ensure the continuous and stable output of slurry to ensure the stability of coating amount; 4. Dynamic filter: ensures effective filtration of the slurry during transportation without the need to clean the filter screen midway; (Our patented design) The filter element is replaceable during use and has a long lifespan. 5. Pressure detection: Monitoring the pressure during slurry transportation can determine the stability of slurry transportation; 6. Pipeline: All slurry conveying pipelines adopt a chuck quick connect method, which greatly facilitates installation, disassembly, and cleaning. 7. The feeding system has the function of automatically controlling the slurry entering the coating tank according to the set liquid level of the coating tank	Screw pump is driven by servo motor
15.	Thickness gauge	Second coating outlet configuration, integrated in the coating group	Optional

3）、Drying channel (double layer layout design)

 

Industrial Design Reference Drawing for Box Appearance Drawing

No.	Project	Technical Parameter	Notes
1.	Oven structure	1. Independent inner liner design, with adjustable overall height of upper and lower inner liners; 2. The height of the hair dryer can be adjusted separately and can be disassembled. 3. Zones 1-3, 7-11, 10-12, and 16-18 are upward curved structures with a total drop of 260mm; 4. Inner liner: SUS304 stainless steel; 5. Outer liner: SUS 201 stainless steel 6. Negative pressure chamber at the inlet and outlet: effectively separates the hot air in the drying channel from the air convection in the operating room, reducing the odor in the operating room; At the same time, it can enhance the uniformity of the temperature in the first or last section of the oven	High speed box
2.	Oven length	55 meters (5 meters per section, a total of 11 sections, each section is double layered);
3.	Circulating air duct and exhaust duct	Sandwich insulation design Inner liner: SUS304 stainless steel Outer liner: SUS 201 stainless steel
4.	Transmission mode of oven guide roller	1. The main transmission idler structure is located in zones 1-3, 7-10, 10-12, and 16-18; 2. Zones 4-6 and 13-15 are horizontal floating structures without rollers 3. Frequency converter+motor control, roller drive can strictly follow the baseband linear speed. 4. Roll diameter Φ 80mm, anodized on the surface of aluminum alloy;
5.	Heating method	External steam heat exchanger heating, hot air circulation structure
6.	Heating power of single zone oven	50KW/5m/zone (a total of 22 temperature zones);	Selection of other heat exchange methods (electricity, gas, heat transfer oil, etc.)
7.	Temperature control	Each box has completely independent two-stage temperature control: Level 1: Temperature control for normal operation of the box; Level 2: Heating package temperature abnormal alarm control. When the heating package exceeds the temperature, an audible and visual alarm will appear, and the main heating power supply will be cut off.
8.	Heating control	After PID calculation of the temperature controller, drive the electric proportional valve to adjust the temperature
9.	Temperature inside the drying tunnel	Room temperature~150 ℃, with a temperature difference of<± 3 ℃ within each temperature zone,
10.	Surface temperature of the box during operation	Outer surface temperature ≤ 50 ℃ (when ambient temperature ≤ 25 ℃)
11.	Blowing method	1. The upper air duct of the boxes in zones 1-3 and 10-12 adopts a porous diffusion method, while the lower air duct adopts a horizontal blowing method of the air knife; 2. Zones 4-9 and 13-20 are centralized spraying of horizontal wind blades; 3. The upper and lower air ducts of each box share a heating element and a fan, which are separated by valves;
12.	Fan control	1. All circulating fans (22 sets of 4kw) are controlled by frequency converters; 2. The dehumidification fans (8 sets of 4kw) are controlled by frequency converters;
13.	Adjustment of Up and Down Blowing Air Volume for Single Section Box	The upper and lower air flow is independently adjusted through mechanical valves in the upper and lower air chambers; The total air volume is adjusted through a frequency converter.
14.	Moisture exhaust air volume of single box and complete machine	The dehumidification air volume of a single box is adjusted through a mechanical dehumidification valve; The total exhaust air volume of the entire machine is adjusted through a frequency converter.
15.	Solvent recovery system	Not provided, only assisting with interface installation
16.	NMP solvent concentration alarm(Optional NMP solvent configuration only)	Two sets of NMP concentration detection probes are configured for each upper and lower layer (a total of six sets)	(Optional) Install the detection probe on the circulating pipeline
17.	Blast circulation air volume	Boxes in zones 1-3 and 10-12, with a single zone air volume of 800-4500 m3/h	Adjust the air valve to control the air volume according to the process (with a scale prompt)
		Boxes in zones 4-9 and 13-20, with a single zone air volume of 1500-7000 m3/h	Adjust the upper and lower air valves according to the process to control the air volume
18.	Make up fresh air and exhaust gas Engine displacement	Each zone 500~3000 ㎥/h	Control the air volume according to the process air valve
19.	Total exhaust air volume	10000~65000 ㎥/h	Frequency converter+motor control air volume
20.	Main insulation	Double layer structure, insulation layer thickness 100mm, Glass wool insulation
21.	Explosion proof pressure relief port	One pressure relief port per section
22.	Filter	Installation of primary filter for main circulation and fresh air inlet
23.	Pressure monitoring	Equipped with three sets of pressure monitoring gauges: upper air inlet chamber, lower air inlet chamber, and inside the oven

No.	Project	Technical Parameter	Notes
1.	Roller mounting structure	Overall vertical plate installation (thickness 30mm, surface chrome plated) CNC machining.
2.	Rear Drive Tension Control System	1. Install a floating tension roller in front of the rear drive roller; Floating roller shaft installation angle sensor; 2. The sensor angle value is controlled by PID calculation to control the speed of the rear drive roller. 3. The tension of the floating roller is controlled by an electrical proportional valve, which is stable and digitally adjustable.
3.	Rear drive roller	Rear driven main roller (rubber roller)+pinch roller (aluminum alloy) mode Drive roller: diameter Φ 150mm, surface covered with EPDM; Pinch roller: diameter Φ 120mm, surface anodized hardened.
4.	Process correction	Installation of drying outlet, automatic EPC control, swing ± 15 degrees Fully automatic deviation correction	Can recognize transparent film

No.	Project	Technical Parameter	Notes
１	Roller mounting structure	Overall vertical plate installation (thickness 30mm), manufactured by CNC machining center; Rotary frame wall panel cast iron (thickness 100mm), produced by CNC machining center;
	Driving method	The servo motor drives the A/B material shaft to automatically rewind, automatically connect the material roll, and change the roll without stopping the machine; The rotary frame is of a disc structure, and the motor drives the center to rotate by 1 revolution per minute; Positioning with rotary encoder and locking with pneumatic brake;
２	Winding tension control system	1. Install a floating roller on the winding frame, and control the winding tension with a pneumatic conversion valve and PLC. 2. PTD control, stable tension and digital adjustable.
３	Winding correction	Automatic EPC control, stroke ± 75mm; The accuracy of the correction controller is ≤ ± 0.5mm.	Ultrasonic sensors can recognize transparent films
４	Material roll support method	The material roll is fixed with a 3-inch inflatable shaft, wound up, and supported by a safety clamp on both sides
５	Reel diameter	Ф 85~ Ф 600mm; Audible and visual alarm prompts for minimum and maximum roll diameter values
６	Maximum bearing capacity of inflatable shaft	750Kg/piece
７	Drum specifications	Length 720mm, inner diameter approximately 76mm (3 inches)
８	Number of winding inflatable shafts	Automatic switching of 2 A/B axes (dual axis winding)
９	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.
10	Automatic roll changing and cutting method	Tooth shaped cutter quick cutting method, upper material receiving method
11	Receiving and pressing roller	Pneumatic pressure roller, pressure adjustable; Make the winding flat and free from slipping

 

6）、Surface density detection system (positive X-ray, negative laser thickness measurement) ------- (Technical requirements can be found in the technical specifications of the thickness gauge)

 

Industrial Design Reference Drawing for Thickness Gauge Appearance Drawing

7）、Control system：

Industrial Design Reference Drawing for Control Cabinet Appearance Drawing

No.	Project	Technical Parameter	Notes
1.	Main control system inside the electric control cabinet	Touch screen, PLC and expansion module, servo driver, frequency converter, signal amplifier button, etc
2.	Signal input and drive	Photoelectric, tension, displacement, angle, temperature and other sensors; Electromagnetic valve, cylinder, servo motor, three-phase AC motor, magnetic powder clutch, etc.
3.	Control method	The combination of touch screen and external buttons, On the touch screen, parameter settings and start stop control of all machine actions can be completed; External buttons have been added to the winding and unwinding racks to facilitate on-site operations.
4.	Fan frequency regulation and temperature setting	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.
5.	Setting range of coating and intermittent length	Single section coating length 50.0~9999.0mm Single segment intermittent length 6.0~9999.0mm	Software lockable range
6.	Fault alarm	When the device malfunctions, the touch screen will prompt corresponding alarm faults And there is an audible and visual alarm
7.	Counting function	During intermittent coating: count the number of pieces, yield, and total length During continuous coating: total length
8.	Intermittent head and tail thickness adjustment function	1. By controlling the speed of the coating valve and reflux valve through a program; 2. By controlling the reflux pressure through a program.
9.	Electric control cabinet	Dual electrical cabinet, separate the power cabinet from the low-voltage cabinet to reduce electromagnetic interference; Each electric cabinet is equipped with dust-proof filter screen and axial flow Computer fan.
10.	MES system interface	The system reserves data communication functions and interfaces with the MES system

 

No.	Name	Brand	Quantity	Notes
1.	Spool	TMAX	2 pieces/set
2.	V-shaped valve core sealing ring	TMAX	10 pieces/set
3.	Mobile vehicle	self-control	1 set/set	Used for oven operation
4.	Electric heating tube	customization	6 pieces

 

 

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

No.	Project	Technical parameter
1.	Die head	Straightness ≤ 2um
2.	Coating roller (steel roller)	Circular runout ≤ 1.5um, straightness ≤ 2um, smoothness ≤ Rc0.4
3.	Deviation correction accuracy of winding and unwinding	±0.5mm

 

2、  Coating accuracy

   （1）Intermittent coating

Project	Mark	Standard: (Continuous coating speed V=33 meters/mi meters/minute), gap of 25 meters/minute
	A (trailing)	≤1mm (Related to the viscosity of the slurry and the properties of the binder)；
	B (abnormal head area)	10mm
	C (tail abnormal area)	6mm
	D (Edge effects area)	≤5mm
	E (length error)/H (blank error)	≤±0.5mm
	F (width error)	±0.5mm
	M (width error)	±0.5mm
	G1 (head thickness)	-10~+5um    （adjustable）
	G2 (tail thickness)	-10~+5um    （adjustable）
	I (Positive and Negative Alignment Error)	≤±0.5mm
	J Single sided thickness and density (Remove areas B, C, and D)	Weight error ≤ ± 1.3% (single sided), ≤ ± 1.2% (double sided) (when the dry thickness of single sided coating is not less than 100um, use the surface density measurement method in item 3)
Length range	L1 (film length)	50.0～9999.0mm
	L2 (intermittent length)	20～9999.0mm
	L1/L2 (coating+gap length)	L1 +L2 ≥100mm

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)

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）

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）

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）