In the production process of lithium batteries, special barrel liners are key components for extruders, injection molding machines and other equipment. They are mainly used to protect the barrel from corrosion and wear, while ensuring uniform mixing and transportation of materials (such as electrode slurry, diaphragm materials, etc.). The following is a detailed introduction to special barrel liners for lithium batteries:
1. Function and Importance
**Corrosion resistance**: Lithium battery slurry often contains organic solvents (such as NMP), binders (PVDF) and active substances (such as lithium salts), and the liners needs to resist chemical corrosion.
**Wear resistance**: Electrode materials (such as graphite, silicon carbon) or ceramic diaphragm coatings may cause wear on the inner wall of the barrel.
**Temperature stability**: Need to adapt to high temperature processing environments (such as slurry drying or melt extrusion).
**Surface finish**: Reduce material adhesion, ensure uniform slurry flow, and avoid dead zones.
2. Common Material Selection**
**Bimetallic bushing**: The outer layer is high-strength steel (such as 42CrMo), and the inner layer is welded with wear-resistant alloy (such as tungsten carbide, nickel-based alloy).
**Ceramic coated bushing**: Ceramic coatings such as alumina and zirconium oxide are both wear-resistant and corrosion-resistant.
**Engineering plastic bushing**: PEEK, PTFE, etc. are used in low-wear and anti-sticking scenarios (such as diaphragm coating).
**Special stainless steel**: 316L or Hastelloy alloy, suitable for highly corrosive environments.
3. Application Scenarios
**Electrode slurry extrusion**: Mixing and extrusion molding of positive and negative electrode slurries, which requires anti-sticking and solvent resistance.
**Diaphragm coating machine**: When coating ceramic diaphragms, the bushing must be wear-resistant and maintain coating uniformity.
**Lithium battery shell injection molding**: Used for melt injection molding of plastics such as PP and PC.
- Design Highlights
**Inner wall treatment**: mirror polishing or laser texturing to balance fluidity and anti-sticking requirements.
**Cooling/heating channel**: integrated temperature control system to ensure uniform material temperature.
**Modular design**: easy to change quickly and reduce downtime.
5. Common Suppliers in the Market
**International brands**: IKV (Germany), Xaloy (USA), Battenfeld (Austria).
**Domestic brands**: Kingfa Technology, Zhuhai Wantong, Shanghai Yike Mould, etc.
6. Maintenance and Replacement
**Regular inspection**: monitor the inner wall for signs of wear or corrosion.
**Cleaning requirements**: avoid cross contamination caused by slurry residue.
**Life cycle**: usually 6 months to 2 years, depending on the frequency of use and material characteristics.
7. Technology Trends
**Nano coating**: Improve surface hardness and chemical resistance.
**Smart bushing**: Integrated sensors to monitor wear and temperature.
**Green materials**: Develop recyclable or low environmental impact bushing materials.
If more specific selection suggestions are needed (such as for lithium iron phosphate or ternary materials), further process parameters (temperature, pressure, material composition, etc.) can be provided for accurate recommendations.
Contact Us Immediately for more Information
Bloom(Suzhou)Materials Co., Ltd
Add: B2106 Wanda Center, Zhangjiagang , Suzhou, Jiangsu, China.
Tel/what’s up: 0086-13914912658
Email: kara@ttxalloy.com
