Version 2.5
May 2026Latest- FeatureLi metal price now scales with Li₂CO₃ price.
- FeaturePre-ionization now eliminates FCE losses first, then reduces anode capacity.
- FeatureAnode foil FCE calculation now removes ions from the cathode to form an SEI layer on the bare current collector during formation, reducing cell capacity.
- FeatureCell energy is now reported as actual usable capacity rather than target capacity.
- FeatureAdded option to hold GWh/year production volume constant instead of number of cells per year.
- FeatureCell pouch cost is now calculated based on cell dimensions rather than a fixed value.
- FeatureAnode and cathode layers are now counted independently for improved accuracy.
- FeatureAdded additional separator and current collector cost options.
- FeatureAdded cell container and tab costs to the bill of materials bar chart.
- FeatureDischarge curves now "knee" properly at the end of discharge instead of being clipped as a result of anode FCE.
- FeatureAdded a processing cost bar chart to the summary page.
- Bug FixFixed a double-counted capacity loss in the cell energy (Wh) calculation.
- Bug FixFixed the directionality of the packing efficiency multiplier, which was causing cells to be sized too small.
- Bug FixFixed the anode FCE lower voltage cutoff to round correctly on the full-cell discharge curve.
- Bug FixFixed an electrode volume change bug for Li-HC (corrected from 0% → 1%).
- Bug FixFixed several V2.4 calculations that were not correctly applied to blended anode configurations.
- Bug FixCurrent collector foil mass correction from V2.4 has been reverted; the doubling was a mistake and masses are restored to their previous values.
- Bug FixFixed volume change of metal anodes.
- Design ChangeDefault separator porosity updated from 50% to 40%; separator density doubled to reflect modern ceramic-coated separators.
- Design ChangeMetal and anode-free anodes are now modeled with a current collector to reflect the practical need for mechanical integrity and tab welding. Electrode manufacturing costs for these anode types have been removed accordingly.
- Design ChangeDefault cell size updated to match the USABC Medium specification.
- Design ChangeElectrolyte fill factor now applies only to anode, cathode, and separator pore volumes, excluding packing void volume.
- MaterialsIron oxalate precursor corrected from Fe₂C₂O₄ monohydrate to FeC₂O₄ anhydrous.
- MaterialsChanged the NFS bill of materials.
- PricesUpdated active and inactive material prices.
- UICost breakdown bar charts now use coordinated colors and include labels for BOM, CapEx, OpEx, COGM, and COGS.
- UIImproved clarity of how to use the spreadsheet, including better labels of the default vs override columns on the front page.
Version 2.4
March 2026- MaterialsLi-PbO has been removed as an anode choice due to insufficient confidence in available literature.
- MaterialsNMC811 half-cell capacity at 4.4V vs Li decreased from 214 to 210 mAh/g.
- MaterialsAdditional anode binders added: PAA, CMC, and SBR.
- MaterialsManganese-based Potassium Prussian White cathode added.
- MaterialsHard carbon capacity and voltage curves have been updated to reflect material improvements in the market.
- MaterialsSodium Prussian White cathode capacity and discharge curve updated.
- Bug FixFixed the volume change calculation instability.
- Bug FixFixed a bug that occasionally broke cell costs by removing a circular calculation.
- Bug FixFixed a slight calculation error with anode porosity.
- Bug FixBlended anode porosity in the discharge state is now 20% instead of 10% to match the other anodes.
- Bug FixThe anode current collector for potassium-ion batteries is now correctly set to aluminum instead of copper.
- Bug FixVolume change calculation for lithium-sulfur cells has been corrected.
- Bug FixMetal anodes no longer incorrectly include binder or carbon content.
- Bug FixCurrent collector foil mass was incorrectly halved and has been corrected. This increases the mass of all cells.
- PricesActive and inactive material prices have been updated.
- FeatureCarbon anode porosity is now dependent on the "energy" or "power" cell selection.
- FeatureAnode binder density is now dependent on anode type.
- FeatureAnode first cycle efficiency (FCE) has been added, which reduces cell capacity and adjusts the lower voltage cutoff of the cell.
- FeatureTarget cell loading is now based on both an upper manufacturing thickness limit and a target areal current density instead of the previous loading override option.
- FeatureYou can now set a target Ah for the cell instead of a pre-defined cell dimension. This is more appropriate for comparing different chemistries.
- FeatureAnode-free cell modeling has been improved: cells are now built without lithium metal and volume change during cycling is accounted for separately.
Version 2.3
October 2025- UIEmphasized the need to enable iterative calculations for the spreadsheet to work properly.
- MaterialsAdded sulfur cathode, sodium metal anode, and lithium metal anode.
- MaterialsUpdated hard carbon to Kuranode Type 2, effectively increasing nominal voltage for all sodium hard carbon cells and improving SIB energy density.
- Bug FixFixed a circular calculation bug that caused blended anodes to give unstable results.
- Bug FixHard carbon volume change calculation was referencing graphite capacity instead of hard carbon. Minimal impact to results.
- Bug FixIncorporated percent of lithiation into alloy anode volume change calculation, effectively decreasing the volume change of all alloy anodes.
- Bug FixFixed the silicon anode error by adding a Si anode charge curve.
- InputsChanged alloy anode porosity in the charged state to a minimum of 20% (previously 10%) to allow for electrolyte diffusion. Alloy anode volume increased accordingly.
- InputsDecreased SiO anode capacity from 3,000 to 1,650 mAh/g.
- PricesUpdated cell component costs based on Shanghai Metals Market rates.
Version 2.2
June 2025- Bug FixProduction scaling factors were incorrectly linked from BatPaC. The fix has slightly increased cell costs.
- Bug FixElectrode coating area parameter missed a layer count multiplier when calculating electrode manufacturing costs. The fix has increased cell manufacturing costs.
- Bug FixAnode foil cost did not automatically update to aluminum when a sodium anode was selected. The fix slightly decreased foil costs for sodium batteries.
- PricesCopper foil costs were substantially underestimated and have been updated accordingly.
Earlier versions of CellVision were distributed informally and do not have formal release notes. Version 2.2 is the earliest tracked release.