Inbound Lithium Ion Cell Receiving Inspection and Standard Operating Procedures
Inbound cell receiving mandates thermal quarantine, UN 38.3 documentation verification, four-wire impedance sampling, and strict AQL defect thresholding.
Material Rejection Notice
Meaning
Official communication sent from a buyer to a supplier documenting that a batch of delivered components fails to meet agreed quality or performance specifications initiates the formal claims process. A material rejection notice lists the non-conforming items, such as electrode foils, separators, or electrolyte chemicals, and provides the laboratory test results that justify the rejection. This document formally halts the payment obligations for the affected lot.
Quality Trigger
Inward inspection failures, such as high water content in electrolytes or pinholes in separator sheets, trigger this notification. The material rejection notice is generated when incoming quality control teams find that the material properties fall outside the limits specified in the purchase agreement. This immediate action prevents the defective materials from entering the production line and contaminating the cell assembly process.
Forensic Evidence
Analytical chemistry reports, physical dimension measurements, or digital microscopic images must accompany the claim. When issuing a material rejection notice, the buyer must provide clear and reproducible data demonstrating the failure. This evidence allows the supplier to conduct their own root cause analysis and locate the specific production batch where the error occurred.
Commercial Remedy
Financial adjustments and emergency shipments are arranged following the confirmation of the quality failure. Once the supplier accepts the material rejection notice, they must either credit the buyer’s account or dispatch replacement materials that meet the specifications. In some cases, a joint audit of the supplier’s manufacturing facility is scheduled to correct the systemic processing issues that caused the defect.
This collaborative resolution minimizes the risk of future production stoppages.