Testing & IQC · 08 Sep 2026
Incoming Inspection Workflow for Battery PACK Manufacturers
A repeatable process for controlling cells, BMS assemblies, busbars, cables, protection devices and structural components before production.
Pack quality starts before the first busbar is installed. Incoming Quality Control prevents defective material from entering production, detects supplier variation and creates traceability for future failure analysis.
Risk-based inspection
| Risk | Examples | Control |
|---|---|---|
| Critical | Cells, BMS, fuses, contactors | Strong inspection and traceability |
| Major | Busbars, cables, connectors, thermal parts | Dimensional and functional checks |
| General | Covers, labels, brackets, packaging | Visual and dimensional sampling |
The incoming workflow
Cell electrical screening
OCV is fast and useful for detecting outliers, but it does not prove health by itself. DC internal resistance measurements must control SOC, temperature, rest time, pulse current and duration. Capacity results are comparable only when charge, rest, discharge and temperature conditions are identical.
Inspect the complete material set
BMS
Appearance, revision, firmware, communication, measurement accuracy, balancing and contactor control.
Busbars & cables
Material, plating, dimensions, burrs, crimp quality, polarity, continuity and contact resistance.
Safety parts
Fuse and contactor part number, rating, batch, coil resistance, insulation and operation.
Thermal parts
Sensor accuracy, cooling-plate flatness, leakage, flow and interface thickness.
Sampling and acceptance
Inspection intensity should reflect component criticality, supplier performance, historical defect rate, process stability and cost of failure. Define measurable limits from the approved specification; avoid instructions such as “voltage should be normal.”
Measurement-system control
Maintain equipment identification, calibration and maintenance records. Use gauge repeatability and reproducibility studies where appropriate. If two inspectors obtain materially different results on the same item, improve the measurement system before relying on the inspection result.
Quarantine and traceability
Physically and digitally separate accepted, pending, rejected and quarantined material. Record material ID, quantity, supplier, batch, defect, result and disposition, then link cell grading to the production MES or traceability record.
Numerical acceptance limits must come from the approved product specification, supplier quality agreement and validated internal procedure.