EV & Battery Manufacturing worked example

Battery Module Assembly Yield at 68% target module yield: a worked example

This worked example runs the battery module assembly yield numbers for a tougher week than the baseline: 68% target module yield instead of the typical 95%. Calculate module assembly first-pass yield from accepted modules, total modules built, and target yield.

The inputs for this scenario

  • Accepted modules: 1,880 modules (held at the documented default)
  • Total modules built/tested: 2,000 modules (held at the documented default)
  • Target module yield: 68 % (the input this scenario stresses; the baseline uses 95)

Working through the calculation

  • The calculation starts from the formula this tool documents: Module assembly yield = accepted modules รท total modules built/tested.
  • Module assembly yield works out to 94 % module FPY at these inputs, and this is the headline figure for the scenario.
  • Module yield gap to target works out to -26 points at these inputs.
  • Accepted modules works out to 1,880 modules at these inputs.
  • Modules built/tested works out to 2,000 modules at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where target module yield sits at 95% and the headline result is 94 % module FPY, this scenario lands almost exactly on the baseline at 94 % module FPY.
  • Use it during module line ramp, weld or wire-bond process tuning, or routine assembly quality reporting. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • Module assembly yield: 94 % module FPY (headline result)
  • Module yield gap to target: -26 points
  • Accepted modules: 1,880 modules
  • Modules built/tested: 2,000 modules

Run it with your numbers

  • To rerun this with your own numbers, open the live Battery Module Assembly Yield calculator, set target module yield to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.