EV & Battery Manufacturing calculator
Cell Stack Alignment Spec Window Calculator
Stack alignment affects compression, separator overlap, weld access, and cell safety. This calculator helps process and quality engineers compare a measured stack alignment value with the approved tolerance window before releasing a lot or adjusting equipment.
What this calculator does
- Check whether measured cell stack alignment is inside lower and upper alignment limits.
- a cell assembly engineer needs a quick in-window check for stack, jelly roll, or lamination alignment
- Returns whether stack alignment is inside the specified tolerance window and the nearest margin.
Formula used
- Alignment is inside spec when measured offset is between lower and upper limits
- Nearest alignment margin = distance to the closest specification edge
Inputs explained
- Measured stack alignment offset: Use the measured offset from vision, metrology, or audit data.
- Lower alignment limit: Use the lower engineering or control-plan tolerance.
- Upper alignment limit: Use the upper engineering or control-plan tolerance.
How to use the result
- Use it for cell stacking, winding, lamination, and alignment audit checks.
- It does not include measurement uncertainty, gauge R&R, sample size, or multi-axis alignment unless those are handled separately.
Common questions
- Can I use microns instead of mm? Yes, if measured offset and both limits use the same unit.
- What does a negative margin mean? It means the measured alignment is outside the nearest specification edge.
- Should I use average or worst-case alignment? Use the value required by your control plan; tight specs often require worst-case or individual readings.
- How can I use the result? Use it to release the lot, adjust stacking equipment, or trigger metrology and containment.
Last reviewed 2026-05-12.