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April 27, 2026
Project-scoped ECM fitting, PyBaMM v26.4.0 support, SDK skills plugin, strict upload validators

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Project-scoped ECM fitting

Equivalent-circuit-model fitting is now available directly inside a project. Pick any measurement already attached to one of the project’s cells (or upload a fresh CSV), preview the trace, run the fit, and save the result back to the project as a new model with one click. The new flow adds a model-vs-data plot, an error plot, a fitting-progress indicator, an OCV toggle helper, and auto-scrolls to the results when the fit completes. The standalone ECM demo continues to work for unauthenticated users.

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PyBaMM v26.4.0 support

The simulation engine has been updated for PyBaMM v26.4.0, which introduces a dedicated Rest step class in place of the old zero-current step and renames the MSMR electrode-capacity parameters from short keys (e.g. Q_n_1, Q_p_1) to descriptive strings (e.g. “Negative electrode host site occupancy capacity (1) [A.h]”). Existing experiments and MSMR parameter sets continue to parse correctly under the new release.

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SDK skills as a Claude Code plugin

The Ionworks Python SDK now ships with a set of installable Claude Code skills covering api-discovery, cell-data, data-upload, simulations, pipelines, and projects-and-studies. Each skill documents the relevant sub-clients, method signatures, and the create-or-get patterns so an AI assistant can drive the SDK against the current API surface. Install via /plugin marketplace add ionworks/ionworks-skills and /plugin install ionworks to get the slash commands and SessionStart hook for any Ionworks project.

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Strict upload validators in the Python API

CellMeasurementClient.create and create_or_get now run optional client-side validators before sending data to Studio so processing bugs surface as a local error instead of a confusing upload result. A hard time-gap check (>5 h between consecutive rows) runs by default; passing voltage_window enables a voltage-continuity check (catches chronological misordering from a faulty data split), and passing rated_capacity enables a consecutive same-direction full-step check plus a soft warning for any step whose capacity exceeds 5× rated.
Improvements
  • Measurement chart controls collapse into a compact header summary; per-axis variable selectors now allow adding and removing series dynamically with a unified two-column layout.
Fixes
  • Study visualization no longer collapses to an empty state when switching between studies whose experiment-type tabs differ — the filter resets to All when the previous tab isn’t present.
  • Users with a stale session can recover by signing out via the sign-in page instead of being stuck on the redirect.
  • The empty cells page now uses the correct organization-level permission check, so users who can create cells no longer see a misleading “contact a project admin” message.
  • Pipeline element details view no longer triggers rapid duplicate fetches for Data Fit and Validation configs.
Improvements
  • Simulations now compile faster by default, speeding up repeated runs that share the same model.
  • Simulation objectives with custom mesh or spatial-method settings (such as CycleAgeing) now serialise and reload correctly.
Fixes
  • Time-monotonicity validation error message now reports the correct two adjacent values (the previous off-by-one showed the values just before the actual violation).
Fixes
  • Sign-convention detection no longer misclassifies low-current pulse datasets as all-rest; the rest threshold now scales relative to the 95th-percentile current so violations are caught on small-amplitude data.