Meaning
Quality control procedure that evaluates battery cells based on two independent performance parameters measured simultaneously or in sequence. The use of dual-metric screening increases the probability of detecting latent defects that a single test might overlook.
Defect Detection
Cells that pass a capacity test might still fail due to a high self-discharge rate which is caught by the second metric. By checking both electrical and thermal signatures, the system identifies units that could cause pack imbalance later. This approach reduces the risk of field failures.
Yield Optimization
Adjusting the thresholds for both variables allows a manufacturer to bin cells with high precision. Tight grouping of cells within a module improves the overall life and efficiency of the finished battery pack. Statistical analysis of the results helps refine the production process.
Throughput Requirement
Implementing two tests increases the time each cell spends in the test station. High speed data acquisition and automated handling are necessary to maintain production volumes. Efficient screening is a balance between speed and sensitivity.
Careful integration of the second measurement phase ensures that the total cycle time remains within the requirements of the factory floor. The addition of a second check provides a much higher level of confidence in the final product.
