Automatic Roll-to-Roll Electrode Slitting Machine for Lithium Battery Cathode/Anode Electrode Sheets Cutting

I. Equipment Overview

1.1 Function Description

This Slitting Machine is mainly for slitting lithium-ion battery electrode sheets. It is a mature, stable model widely used in our company, supporting a slitting width range of 15–380 mm. User-friendly, it meets various slitting process requirements. Adopting a dual-shaft rewinding structure, it works as follows: the electrode sheet is mounted on the unwind shaft, passively unwound via the drive roller with automatic guiding; after going through the slitting blades and iron powder removal unit, it is slit and rewound as per process requirements. The machine features easy operation, simple loading and threading, stable performance, and excellent slitting results.

1.2 Key Technical Parameters

· Production Capacity: Max mechanical speed is 80 m/min; typical production speed is 0.5–50 m/min with stepless adjustment.

· Rewinding Alignment Accuracy: ≤ ±0.5 mm (assuming good incoming material quality).

· Pass Rate: ≥ 99% (excluding factors such as poor incoming material).

· Utilization Rate: ≥ 95% (excluding material replacement and incoming quality issues).

Table 1.1 Main Components List

1.3 Equipment Diagram

Figure 1.1 Equipment diagram of slitting machine (for reference only)

1.4 Equipment Workflow

The equipment workflow is outlined as follows:

Web Threading Procedure:

1. Load material onto the unwind shaft using a transfer cart.

2. Manually thread the electrode sheet through the splicing unit.

3. Guide it through the tension system.

4. Manually feed the sheet to the slitting blades for pre-slitting.

5. Pass the pre-slit sheet through the dust and iron removal system.

6. Place the core sleeve onto the slip shaft.

7. Tape the electrode sheet onto the core sleeve on the slip shaft.

8. Set the required sheet tension.

9. Switch the web guiding system to automatic mode.

10. Press the system start button.

11. The equipment automatically slits and rewinds the material into rolls.

1.5 Major Components

1.5 Main Component Structure

1.5.1 Unwinding Mechanism
a) The unwinding mechanism is integrated, designed and assembled in unison with the whole machine to ensure accuracy in electrode feeding and slitting.
b) Equipped with an independent web guiding and tension system for more stable electrode and tension control performance.
c) Uses high-quality materials and optimized structural design to ensure material and mechanical performance requirements are met.

1.5.2 Knife Rack Mechanism

a) Micron-level machining precision guarantees superior blade concentricity.

b) Detachable bearing seats greatly enhance blade replacement efficiency.

c) A micro-adjustable knife holder enables precise adjustment of blade engagement, effectively controlling burrs and prolonging blade service life.

d) Adjustment rollers on both sides of the knife holder facilitate tuning of the electrode's entry and exit angles; combined with blade engagement, they effectively resolve the wavy edge problem.

e) The line speed ratio of upper and lower blades is adjustable. Both are driven by independent servo motors and can be adjusted via a touchscreen.

1.5.3 Rewinding Mechanism

1.5.4 Dust Removal & Iron Removal System
The dust collection system adopts a multi-stage setup: blade area vacuum, double-sided electrode brushing after slitting. The brushing unit uses roller brushes and dust boxes to reduce electrode flutter and effectively remove dust.
The de-ironizing system uses dual-sided magnetic separation after slitting. With magnetic strength of 6000 Gauss, it effectively removes iron powder from both sides of the electrode.

1.5.5 Key Electrical Components

2. Incoming Material & Product Specifications

2.1 Base copper foil thickness: 6–20 μm; electrode thickness: 50–300 μm
2.2 Base aluminum foil thickness: 10–25 μm; electrode thickness: 50–300 μm
2.3 Web width: 50–400 mm (coating width: max 380 mm); max unwind diameter: φ450 mm
2.4 Slitting width: ≥ 15 mm; rewind diameter: max φ350 mm
2.5 Unwind core diameter: 3 inch; rewind core diameter: 3 inch
2.6 Slitter set: 14 lanes; post-slit width 58 mm or 59 mm (choose one)
2.7 Max unwind load: 500 kg; max rewind load: 200 kg
2.8 Slitting width min ≥ 15 mm; minimum trimmed edge width (coated area): ≤ 3–5 mm

3. Technical Parameters

3.1 All slitting blades have a diameter of φ100 and are made of tungsten carbide:

· Negative electrode top blade: service life ≥ 500,000 m, regrindable ≥ 10 times

· Positive electrode top blade: service life ≥ 300,000 m, regrindable ≥ 10 times; each regrind provides ≥ 200,000 m

· Bottom blade: single-side service life ≥ 500,000 m; reversible; combo spacer option available upon customer request

3.2 Capacity/speed: maximum mechanical speed 80 m/min; typical production speed 0.5–50 m/min, stepless

3.3 Equipment failure rate (machine-caused) ≤ 1%

3.4 Slitting accuracy: width tolerance

3.15 Compressed air: 0.6 MPa, 5–8 m³/min; interface tube OD 10 mm

3.16 Weight (approx.): 2,500 kg (actual measurement preferred)

3.17 Machine dimensions (L×W×H): approx. 1,710×1,600×1,700 mm (final design prevails)

Dust collector dimensions (L×W×H): approx. 670×700×1,300 mm (standalone industrial unit) ± 0.05 mm

3.5 Yield rate ≥ 99%
3.6 Post-slit edge burr: longitudinal ≤ 5 μm; transverse ≤ 7 μm
3.7 Post-slit edge waviness ≤ ± 0.2 mm/m; no sawtooth waviness; edges smooth and flat
3.8 Slit edge ripple height ≤ 0.3 mm/m
3.9 Web guide stroke: ± 50 mm; manual/auto; accuracy ± 0.1 mm
3.10 Rewinding regularity ≤ ± 0.5 mm
3.11 Electrode tension loop control 5–10 kgf; accuracy ± 1.5 N
3.12 Repeatability/reproducibility: 20+ hours/day with routine maintenance
3.13 Power: AC 380 V, 50 Hz, ~8 kW, 3 phase 

4. Main Advantages

1. 

Slitter features high shaft machining precision:
 a. Roller and drive shafts OD tolerance ≤ ± 0.02 mm, cylindricity ≤ ± 0.02 mm
 b. Dynamic and static balancing with dualdirection inspection

2. Max speed 80 m/min; typical production 0–50 m/min stepless

3. Equipment weight ≥ 2.5 t ensures stability during highspeed operation

4. Fixed spacer knife rack: spacer face parallelism ≤ 0.005 mm; simple structure; easy for novice or experienced operators

5. Servodriven cutter and rewind ensure stable, reliable performance

6. Servodriven differential shaft rewind simplifies unloading; stable and easy operation

7. Adjustable upper/lower blade speed ratios via touchscreen for optimal slitting

8. High slitting precision: burr ≤ 5 μm longitudinal, ≤ 7 μm transverse (materials must meet specs)

5. Standard Configuration & Compliance

1. Appearance: control cabinet standard; main frame color “Computer White CH131”; other parts chromeplated (provide color swatch if needed)

2. Complies with national safety standards and customer safety codes

3. Includes Chinese operation manual and maintenance handbook

4. Comes with tool kit (hex wrenches, screwdrivers, etc.)

5. Acceptance slit specs: 7 lanes × 58 mm or 59 mm (18650 cell); machine equipped for one spec only for acceptance test

6. Wear parts list:

7. Delivery kit for one machine (additional items to be purchased separately):

Note: Each machine is delivered with one slag wheel per slit spec, one knife rack loaded with that spec; additional specs require separate purchase.