Battery Electrode Coating Machine is a key equipment used in the production of lithium-ion batteries. It applies a uniform layer of electrode slurry (a mixture of active material, binder, and solvent) onto a metal current collector (such as copper for the anode and aluminum for the cathode). This process is critical for ensuring consistent electrochemical performance and high energy density in the final battery cells.

Lithium Battery Coating Machine is a specialized three-roller transfer coating system designed for research and development applications in the lithium-ion & Soudium ion battery industry. It allows both continuous and intermittent coating, making it versatile for different coating experiments and process optimizations.

*Substrate tension control, stable belt, configuration of correcting device;

*Hot air oven, double-sided airing on the top and bottom, good drying effect;

*Three-roll transfer coating with a wide coating window;

*Comma scraper metering, with precision adjustment mechanism, to achieve high coating accuracy;

*PLC control, touch screen operation, easy to use;

*Optional solvent recovery treatment device;

Integral Unwinding, Head Mechanism

Winding Mechanism: it has the same function as unwinding, as follows

Oven

Control Dystem

Hardware Accuracy

1) The ambient temperature of the machine head is 25~30°C, and the rest is 10~40°C;

2) The relative humidity of the machine head is RH ≤ 35%, the negative electrode RH ≤ 98%, and the rest ≤ 98%;

3) Power Supply: 3PH 380V, 50HZ, voltage fluctuation range: +8%~–8%; power supply total power 26KW;

4) Compressed Air: after drying, filtering and voltage regulation: the outlet pressure is greater than 5.0kg/cm2

Battery Coating Machine

roll to roll coating

Roll To Roll Coating Machine

Battery manufacturing machine

The coating process in lithium battery manufacturing is a critical step, as the uniformity of the coating thickness directly affects the battery's capacity, cycle life, and safety. In actual production, issues such as uneven coating thickness (e.g., "thick edges" and "thin edges") are common and pose significant challenges to improving battery performance.

We will analyzes the causes of coating thickness unevenness from multiple aspects, including slurry characteristics, process parameters, equipment precision, and environmental factors, and proposes optimization strategies to address these issues.

Analysis of the main reasons for uneven coating thickness

1. Influence of Slurry Fluid Characteristics

(1) The viscosity, surface tension, and solid content of the slurry are key factors affecting coating uniformity.

(2) Viscosity and Flowability: High-viscosity slurry tends to accumulate locally during the coating process, leading to "thick edges" at the starting and stopping points. When the slurry viscosity is too high, its flowability is restricted.

(3) Surface Tension: Slurries with excessive surface tension are prone to forming "crescent-shaped" thick edges at the coating boundaries, compromising coating uniformity.

(4) Fluctuations in Solid Content: Instability in solid content affects slurry flowability, causing variations in coating thickness. When the solid content deviation exceeds ±0.3%, the uniformity of the coating thickness deteriorates significantly.

2. Improper Process Parameter Settings

3. Insufficient Equipment Precision and Stability

(1) Die Design Defects: Deviations in the gap of the slit or unreasonable die exit shape can lead to uneven slurry flow, causing coating thickness variations.

(2) Substrate Tension Control: Fluctuations in substrate tension can cause jittering during the coating process, affecting the uniformity of the coating.

(3) Equipment Wear: Wear on the coating roller or backing roller can alter slurry transfer efficiency, leading to coating thickness fluctuations.

4. Environmental Factors Interference

Effects of Uneven Coating Thickness

Capacity Decay: Areas that are too thin may result in insufficient active material, affecting the battery's capacity.

Shortened Cycle Life: Thickness differences can cause electrode stress concentration, accelerating material degradation.

Safety Hazards: Areas that are too thick may lead to lithium dendrite growth, increasing the risk of short circuits.

Optimization Strategies

To improve coating thickness uniformity based on the above reasons, the following aspects can be addressed:

Conclusion

The solution to the uneven coating thickness problem in lithium battery coating requires multi-dimensional collaborative optimization from slurry characteristics, process parameters, equipment precision, and environmental control. By deeply studying the interactions of these factors and incorporating intelligent technologies to improve production control precision, coating uniformity can be effectively improved, leading to a comprehensive enhancement of lithium battery performance.

Hot Tags: battery electrode coating machine, China battery electrode coating machine manufacturers, suppliers, factory, Battery Electrode Calendering Machine, Slitting Machine, copper foil slitting machine, Laboratory NMP System, Pouch Cell Die Cutting, 3 rollers battery electrode intermittent coating machine