EV & Battery Manufacturing worked example

Battery Cell First-Pass Yield at 99% target cell first-pass yield: a worked example

Push target cell first-pass yield up to 99% and the picture changes. This example computes every intermediate figure at that operating point. a cell production team needs to see whether coating, winding/stacking, formation, or grading output is meeting the daily yield target

The inputs for this scenario

  • Accepted first-pass cells: 46,200 cells (unchanged)
  • Total cells tested: 48,000 cells (unchanged)
  • Target cell first-pass yield: 99 % (raised for this scenario; the documented default is 96)

Working through the calculation

  • Applying the documented formula (Cell first-pass yield = accepted first-pass cells รท total cells tested) to the inputs above produces each figure below.
  • At this operating point the engine returns 96.25 % FPY for cell first-pass yield, the number this scenario is built around.
  • At this operating point the engine returns 2.75 points for yield gap to target.
  • At this operating point the engine returns 46,200 cells for accepted cells.
  • At this operating point the engine returns 48,000 cells for cells tested.

How this compares with the baseline

  • Against the tool's baseline example, where target cell first-pass yield sits at 96% and the headline result is 96.25 % FPY, this scenario lands almost exactly on the baseline at 96.25 % FPY.
  • It computes accepted first-pass cells as a percentage of total cells tested, then the point gap to your target FPY. The value of this scenario is the size of the gap it exposes: that gap, priced out over a year, is the budget you can justify spending to close it.

Results at a glance

  • Cell first-pass yield: 96.25 % FPY (headline result)
  • Yield gap to target: 2.75 points
  • Accepted cells: 46,200 cells
  • Cells tested: 48,000 cells

Run it with your numbers

  • Every input above is editable in the live Battery Cell First-Pass Yield calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.