Hot Calender Electrode Rolling Press Machine For Pouch Cell Electrode Making

1.Introduction

1.1 Function: This battery electrode sheet continuous rolling production line is used in the rolling process of lithium-ion battery pole piece production to realize the continuous rolling production of battery pole piece coils and meet the specifications and quality required by the battery pole piece process;

1.2 Equipment composition: It mainly includes unwinding device, belt connecting device, edge trimming device, dust removing and iron removing device, heating roller press, belt connecting device after pressing, winding device, hydraulic system, drive control system, disassembly roller device, etc;

1.3 Schematic diagram of equipment layout (the picture shows the right type, and the left type is symmetrical to it):

 

2.Process parameters

2.1 Application: Suitable for the rolling process of battery materials such as lithium iron phosphate, lithium cobalt oxide, lithium manganate, ternary, lithium titanate, etc.

2.2 Adapt to incoming material specifications: pole piece width 150～300mm, material roll diameter ≤500mm

2.3 Output product indicators:

2.3.1 Thickness uniformity of pole piece after rolling: ≤±0.002mm (required thickness accuracy of incoming material: ≤±0.002mm);

2.3.2 Alignment error of winding edge: ≤±0.3mm

 

3.Installation

3.1 The main engine part requires ground load ≥ 3.5t/㎡ (or base on the provided foundation drawing)

3.2 Power supply: 380V±5%, 50Hz three-phase five-wire system

3.3 Total power: 60kW+10% safety factor/unit

3.4 Compressed air: pressure 0.2～0.7MPa, flow rate: 20L/min, the outer diameter of the interface pipe is 8mm

3.5 Operating environment: temperature range 0～+45℃ relative humidity: ≤30%

3.6 The inner diameter of the barrel: 3inch, the length of the barrel ≤550mm

 

4. Equipment function index

4.1 Overall dimensions of the continuous rolling line (length*width*height): 4.8×2.6×2 m

4.2 Total weight of equipment: about 9 tons

4.3 Appearance color of the equipment: national standard warm gray 1C

4.4 Arrangement: left/right (the power drive part is on the left/right when viewed from the feed end)

4.5 Rolling speed: 1-12m/min

4.6 Maximum pressure between rollers: 1800kN

4.7 Overall equipment efficiency: OEE≥95%

4.7.1 Calculation formula: OEE = availability rate × performance × product qualification rate

4.7.2 Sub-indices

Related sub-indices		Note
Availability = operating time ÷ planned working time	98%	Utilization rate
Expressiveness = total output ÷ (operating time min*CPM)	98%	Equipment capacity
Product qualification rate = actual number of good products ÷ planned number of good products	99%
Note: When calculating, deduct the factors that affect normal production such as material supply, power supply, gas supply, etc.

4.8 Design and manufacturing regulations and standards: in line with relevant national standards

 

5.Main performance indicators

5.1 Unwinding device

l Function: Passively provide pole pieces for rolling under certain tension control

• l Unwinding inflatable shaft: Φ74mm with inflatable gun
• l Effective use length of inflatable shaft: 550mm
• l Tension adjustment (setting) range: 1～20kgf
• l Tension control accuracy: 5%
• l Correction control: infrared photoelectric correction
• l Correction stroke: ±50mm
• l Edge control: deviation correction accuracy is ≤±0.2mm
• l Magnetic powder brake: 50Nm

 

5.2 Front connecting device

l Function: Used to connect the pole piece when it breaks during the rolling process or when changing the material roll to reduce the waste of pole piece.

l Composition: It is composed of connecting plate, pressure rod, air cylinder, guide roller and other parts.

l Control: the cylinder is controlled by the manual pneumatic valve to compress and loosen the pole piece

l Operation: manual connection

 

5.3 Edge trimming device

l Function: Used to cut off the uncoated foil on both sides of the pole piece, reduce the wrinkles of the pole piece caused by the inconsistent elongation rate during rolling, and reduce the scrap rate caused by the pole piece strip.

l Principle: The upper cutting blade is manually fed, relying on the knife, and the left and right cutting knives are controlled separately.

l Drive: 0.55KW variable frequency motor drives the lower cutter shaft to be consistent with the rolling speed

l Slitting speed: the slitting speed is synchronized with the rolling of the main machine

l Upper cutting blade: Φ100×Φ65×1.2mm

l Cutting blade: Φ100×Φ65×2mm

 

5.4 Dust removal device

l Function: Clean up the dust and burrs on the pole piece

l Composition: consists of front and rear roller brushes, air cylinders, vacuum cleaners, roller brush drive motors, etc.

l Principle: Use front and rear roller brushes to brush down the dust and burrs on the pole pieces, pass the dust suction bucket, the dust and air are separated by the cyclone separator, and the clean air is discharged from the muffler through the fan. Clean the dust regularly.

l Number of roller brushes: 2

l Drive: 0.75KW high pressure fan drive

l Processing air volume: 2.4 m3/min

 

5.5 Front damping device

l Function: reduce the jitter of the pole piece during the rolling process and prevent the strip from breaking

l Composition: fixed guide roller, floating guide roller, fixed bracket, etc.

l Principle: The pole piece passes through the floating guide roller to reduce the jitter of the pole piece and prevent the pole piece from being stripped.

 

5.6 Roller press

l Structure: Two rollers are arranged horizontally up and down

l Frame: "mouth" type casting arch

l Bearing seat: 45 cast steel

l Base: overall base

l Roll size: φ400mm×450mm

l Roll material: 9Cr3Mo (electroslag remelting)

l The depth of the quenched layer of the roll surface: ≥18mm, the roll is quenched and tempered HB280-300.

l Roll surface roughness Ra≤0.2um

l Roll cylindricity≤±0.001mm

l Tolerance of radial runout of roll assembly machine: ≤±0.002mm

l Heat roller structure: solid roller with heating hole

l Heating connection mode: the shaft end is connected by RHG rotary joint

l Roll heating method: mold temperature heating controller

l Heating medium: heat transfer oil

l Heating temperature: room temperature～120℃, continuously adjustable, controlled by digital display temperature controller

l Roll surface temperature uniformity error (working surface): ≤±1℃

l Adjustment accuracy: ±0.5℃

l Heating speed: heating from room temperature to 80℃, heating ≤100 minutes; heating at room temperature to 120℃, heating ≤150 minutes

l Heating power: 45kW

l Preset line pressure of roller press: 5t/cm

l Roll gap adjustment range: 0-2mm, touch screen display.

l Roll gap adjustment: Servo motor drives the middle wedge to adjust through the ball screw

l Adjustment accuracy: 0.001mm

l Maximum pressure between two rollers: 1800KN (pressurized by gas-liquid booster pump)

l Drive: The geared motor is connected to the rolls through the elastic pin connector, and the rolls are driven by gears

l Main motor power: 7.5KW (380V 50HZ variable frequency speed regulating motor)

l Rolling speed: 1-12m/min (stepless speed regulation)

l Electrical control: PLC program control, touch screen operation.

l Work pressure: gas-liquid booster pump

l Pressure method: lower hydraulic cylinder and upper pressure

l Hydraulic cylinder diameter: φ220mm

l Hydraulic system: the maximum pressure is 31.5MPa.

l Host device size: (length × width × height) about 2800mm × 950mm × 1930mm

l Arrangement: Left/Right (the power-driven part on the left side of the feed end is the left type, and the right side is the right type)

l Appearance of equipment: The color is international standard warm gray 1C or customized according to customer requirements

l Host weight: about 6 tons

 

5.7 Rear vibration damping device

l Function: reduce the jitter of the pole piece during the rolling process and prevent the strip from breaking

l Composition: fixed guide roller, floating guide roller, fixed bracket, etc.

l Principle: The pole piece passes through the floating guide roller to reduce the jitter of the pole piece and prevent the pole piece from being stripped.

 

5.8 Winding device

l Function: Collect the rolled pole pieces into coils

l Composition: Inflatable shaft, deviation correction, magnetic powder clutch, winding reducer, frame, etc.

l Principle: After rolling, the pole pieces are collected into coils, and the edges of the coils are neatly controlled by the correction mechanism.

l Rewinding inflatable shaft: Φ74mm with inflatable gun

l Effective use length of inflatable shaft: 550mm

l Tension adjustment (setting) range: 1～20kgf

l Tension control accuracy: 5%

l Correction control: infrared photoelectric correction

l Correction stroke: ±50mm

l Edge control: deviation correction accuracy is ≤±0.2mm

l Magnetic powder clutch: 50Nm

l Winding power: 1.5KW reduction motor

 

5.9 Drive control system

l The drive of each component of the entire continuous rolling production line is driven by motors of different specifications and models, which are centrally operated on the operation panel, and all drive motors are equipped with overload protection;

l The control part includes: touch screen, PLC, main motor inverter, roller gap servo motor driver, tension controller, correction controller, etc.

l The operation of the system adopts PLC control, touch screen and button operation mode, and emergency stop buttons are provided at the suspension operation station, the rolling mill feed end, and the winding and unwinding operation end to ensure the safety of the operator

l The main control items of the system include:

l Roller press start, stop, indication, overload protection

l Hydraulic system start, stop, instruction

l Rolling speed setting, speed display

l Pressure setting, pressure display

l With roller pressure parameters (pressure, roller gap) clearing and memory function

l Rolling parameters can be automatically restored according to the pole piece model

l Meter counting function

l Abnormal alarm function

l Equipped with MES data output docking function, docking method and database collection method are provided by the buyer

 

5.10 Roller disassembly device

l Function: This device is used for roll replacement or maintenance, reducing the operation time of disassembling rolls and reducing the labor intensity of operators

l Composition: consists of a roll-removing bracket, a roll-removing guide rail, etc.

l Operation: When disassembling the roll, push the roll and the chock out of the dismounting guide rail, and use a crane or forklift to disassemble the rolls and transport them out. The installation is carried out in the opposite steps.

 

6.Configuration list

No.	Name	Brand/Model	Note
1	Roller	Xingtai Sinosteel	Certificate of conformity
2	Bearing	Bush / Luo shaft
3	Reducer	Boneng/Guomao
4	PLC	Siemens/Delta
5	Touch screen	Siemens/Delta
6	Frequency converter	Siemens/Delta
7	Roll gap adjustment servo system	Siemens/Delta
8	Electrical components	Schneider, Chint
9	EPC	Aibo/Timaco
10	Gas-liquid booster pump	United States AZ
11	Pneumatic Components	Airtac/SMC	Air pipe is blue

 

7.Spare parts list

No.	Name	Quantity	Unit	Note
1	Doctor blade	4	pcs
2	Upper cutter blade	2	pcs
3	Lower cutter blade	2	pcs
4	Hydraulic line seals	2	set
5	Roll changing accessories	1	set	1 set per workshop
6	Simple equipment maintenance tool	1	set	Toolbox

 

8.Consumable parts list

No.	Name	Specification	Quantity	Brand	Reference replacement cycle
1	Doctor blade	0.2*30*450mm	2	Switzerland	15 days
2	Upper cutter blade	Φ100*1.2	2	Domestic	15 days
3	Lower cutter blade	Φ100*2	2	Domestic	15 days
4	Roller	Φ400*450	2	Sinosteel	6 months (Grind)
5	Gear oil	VG320	50L	Great Wall	12 months
6	Hydraulic oil	L-HV150	20L	Great Wall	12 months
7	Low friction cylinder		2	Airtac/SMC	2 years
8	Three-axis cylinder		2	Airtac/SMC	2 years
9	Ultra-thin cylinder		4	Airtac/SMC	2 years
10	Pull valve		5	Airtac/SMC	2 years
11	The electromagnetic valve		4	Airtac/SMC	2 years
12	Axial fan		2		2 years
13	Potentiometer		1	Schneider	2 years