Open Circuit Voltage Distribution

Measurement Process

Measuring the voltage of each cell after aging helps manufacturers identify cells that have high self-discharge rates or internal defects. Analysing the open circuit voltage distribution allows quality control teams to group cells into narrow voltage bands for pack assembly. This grouping is essential because mismatched cells in a pack can lead to uneven wear and early pack failure.

Sourcing teams must require this distribution data to verify supplier manufacturing consistency.

Quality Control

A narrow voltage distribution indicates that the manufacturing process is stable and that the supplier maintains high quality control standards. When the open circuit voltage distribution is wide, it suggests that the production line suffers from inconsistent materials or process variations. Sourcing teams use this measurement to identify potential quality issues before the batteries are shipped from the factory.

This proactive quality check prevents the purchase of unreliable or mismatched battery cells.

Procurement Strategy

Sourcing departments should negotiate strict limits on voltage variations in their purchasing agreements to ensure consistent cell quality. Sourcing contracts should require the supplier to provide distribution reports for every shipment as a condition of acceptance. This requirement ensures that the batteries used in the finished products will perform reliably and have a long cycle life.

Sourcing budgets benefit from the reduced need for cell sorting and the lower rate of pack warranty claims.