Quality Control Services for Li-ion Battery Products in Asia
including China, Vietnam, India, Cambodia, Bangladesh, Thailand, Malaysia, Indonesia, Myanmar and Pakistan
V-Trust delivers end-to-end Li-ion battery quality control solutions to ensure compliance with safety standards and your technical specifications. Operating across 10 Asian countries with 600+ well-trained full-time employees , V-Trust delivers reliable product inspections , supplier evaluations , and lab testing services, guaranteeing that your Li-ion battery meet quality, performance, and safety requirements.
Our engineers evaluate battery samples for safety, capacity, cycle life, and certificates. We benchmark performance against your specs to identify optimal suppliers.
Production Monitoring
On-site oversight of electrode manufacturing, electrolyte filling, and sealing processes. We verify moisture control, spot weld integrity, and aging room protocols to prevent swelling/leakage defects at critical stages.
During Production Inspection
Once at least 10% of the Li-ion battery order is completed, ,our team performs a mid-production inspection to evaluate:
Cell stacking alignment
Tab welding strength
Initial capacity/IR consistency
This early-stage inspection helps minimize rework and avoids late-stage surprises.
Pre-Shipment Inspection
Before shipping, we perform a thorough final inspection of your electric bikes to confirm:
Safety: Hi-pot test, leakage current
Performance: Capacity, cycle life
Marking and labels: UN38.3 packaging, Class 9 labels
100% voltage/IR sorting
Container Loading Supervision
We verify pallet stacking, moisture barrier installation, and hazardous goods segregation. Container floor conditions and secure lashing are monitored to prevent damage or corrosion during transit.
6. Why Choose V-Trust for Li-ion Battery QC?
Asia's leading product inspection company
Only full-time, professionally trained inspectors
19 years of experience in quality control
600+ well-trained full-time employees
Trusted by over 13,000 importers and buyers worldwide
Local teams in 10 Asian countries
Fully accredited for inspection, audit, and lab testing services
Click the diagram below to view the full production process for Li-ion battery (including key processes, main equipment, and potential major problems during production).
Process 1. Electrode Coating
Key processes: Active materials (such as LiCoO₂ or LiFePO₄ for cathode, graphite or Si-C for anode) are mixed with conductive agents and binders to form slurry, which is uniformly coated onto current collectors (aluminum or copper foil).
Main equipment: Coating machine, Mixer, Drying oven.
Process 2. Electrode Calendering
Key processes: Dried electrodes are calendered to achieve the desired thickness and density, improving energy density and uniformity.
Main equipment: Calendering machine, Thickness gauge.
Process 3. Slitting
Key processes: The calendered electrode rolls are slit into specific widths for subsequent winding or stacking.
Main equipment: Slitting machine, Electrostatic dust removal system.
Process 4. Cell Assembly (Winding / Stacking)
Key processes: Cathode, separator, and anode are wound or stacked in sequence to form the cell core.
Main equipment: Winding machine, Stacking machine, Separator unwinder.
Process 5. Cell Enclosure & Welding
Key processes: The cell core is inserted into the housing, and tabs, leads, and safety vents are welded securely.
Main equipment: Laser welding machine, Spot welder, Casing machine.
Process 6. Electrolyte Filling
Key processes: Electrolyte is injected into the cell under vacuum to ensure full wetting of electrodes and separator.
Main equipment: Vacuum electrolyte filling machine, Vacuum oven.
Process 7. Formation & Aging
Key processes: Charge-discharge cycles form a stable SEI layer and stabilize electrochemical performance, while defective cells are eliminated.
Main equipment: Formation cabinet, Aging rack, Charge/discharge tester.
Process 8. Capacity Grading & Sorting
Key processes: Measure cell capacity, internal resistance, and voltage consistency, then sort by performance grade.
Main equipment: Grading cabinet, Internal resistance tester, Sorting machine.
Process 9. Packaging & Final Inspection
Key processes: Qualified cells are packaged, labeled, wrapped with protective materials, and undergo final visual and safety inspection.
Main equipment: Packaging machine, Labeling machine, Withstand voltage tester.
8. The Most Related Sourcing Fairs in Asia
World Battery & Energy Storage Industry Expo (WBE)
Date: September 16–18, 2026
Venue: China Import & Export Fair Complex, Guangzhou, China
Electrical & Electronics Products Home Appliances, Lights & Lighting, Audio & Video Products, Mobile Electronics, Computer & Peripherals, Car Electronics, Electronics Accessories, Electrical Tools, Remote Control Toys, etc.
Softline Products Apparel, Fabrics, Fashion Accessories, Home Textiles, Footwear & Leather Products, Luggage & Bags, Caps & Headwear, etc.
Industrial Products Contruction, Machinery & Parts, Mechanical Equipment, Metal Sheets, Plastic Films, Tools & Equipment, etc.
