International standardization of solid-state batteries has officially begun at the International Electrotechnical Commission (IEC).
On August 21, 2026, a solid-state battery standard proposal submitted by China was approved as an IEC New Work Item Proposal (NWIP), launching the world’s first international standardization process for the solid-state battery field (primary source: based on IEC-related reporting). Experts from France, Japan, and Korea are participating in the standardization working group. Solid-state battery standardization is the process of unifying cell specifications and safety test methods, and it will directly affect domestic solid-state battery equipment makers.
Mechanism-Perspective Impact Analysis
International standards are the process of unifying cell dimensional tolerances, safety test methods, and connector specifications. From the perspective of a company designing pressurized stack equipment, standardizing the test methods for solid-state battery cell thickness tolerance and stack-pressure application method (isostatic vs. uniaxial) is expected to reduce the frequency of platen design changes. However, since the draft standard is being authored under Chinese leadership, domestic equipment makers find it difficult to pre-adjust their own stack-pressure design values to match the draft standard before its detailed provisions are disclosed. This design-change risk remains in place until the solid-state battery international standard is finalized.
Spec Comparison Table
| Item | Current | Expected After Standardization |
|---|---|---|
| Cell thickness tolerance spec | Managed individually by company (undisclosed) | Unified spec expected (detailed provisions undetermined) |
| Stack-pressure test method | Varies by company | Test-method standardization expected |
| Standardization start date | – | 2026-08-21 (IEC NWIP approved) |
| Participating countries | – | China (lead), France, Japan, Korea |
One-Line Summary: The launch of the IEC solid-state battery international standard is an early signal that the cell-specification reference basis for pressurized stack equipment will change, and it remains a design-change risk for domestic equipment makers until detailed provisions are disclosed.