Quantifying Micro Leak Thresholds for Lithium Ion Envelope Integrity Assurance
Micro leak rates above 1.0e-6 mbar L/s drive moisture ingress and hydrofluoric acid formation, degrading lithium ion cell capacity and triggering transport failure.
AQL Sampling Inspection
Meaning
Statistical quality control protocols provide a fixed method for determining whether a production lot meets specific quality requirements without testing every individual unit. Using aql sampling inspection allows a buyer to accept or reject a batch based on the number of defects found in a randomly selected subset. This approach defines the maximum number of defective units that can be present for the entire lot to stay compliant.
Sampling Plan
Standardized tables from ISO 2859 provide the counts needed to determine how many cells must be pulled from a shipment. A larger batch usually requires a larger sample size to maintain statistical confidence.
Acceptance Limit
The specific value chosen for aql sampling inspection represents the poorest quality level that the consumer considers acceptable as a process average. If the number of defects found in the sample is less than or equal to the acceptance number, the batch passes. Higher values indicate a higher tolerance for defects.
Batch Disposition
When the number of failures exceeds the rejection number, the entire lot is failed and returned to the manufacturer. This movement forces the supplier to sort the remaining units or improve the production line. The protocol acts as a gate.
Buyers use the result to trigger corrective actions that prevent similar quality issues in future shipments (ensuring that the supply chain remains stable over time).