The Battery Technology EV Makers Have Promised for Years Is Getting Its Rulebook

On 21 August 2026 China's market regulator announced that a proposal for the world's first international standard for solid-state electric vehicle batteries had been launched at the International Electrotechnical Commission. Why standards matter and where the technology stands.

An all-solid lithium-sulfur battery developed at Oak Ridge National Laboratory. Solid electrolytes are at the heart of next-generation battery research. Photo: Oak Ridge National Laboratory, via Wikimedia Commons (CC BY 2.0)

By the UISC BD Editorial Desk · United Information Service Center · Published 13 September 2026 · 4-minute read

What Was Announced

On 21 August 2026, China's State Administration for Market Regulation (SAMR) said that an international standard proposal for solid-state batteries used to power electric vehicles had been successfully initiated at the International Electrotechnical Commission (IEC), the global body that sets standards for electrical technologies.

It is described as the first international standard in the solid-state battery field.

What a Solid-State Battery Is

Today's lithium-ion batteries move charge through a liquid electrolyte. A solid-state battery replaces that liquid with a solid material. Researchers and manufacturers are pursuing the technology because it promises batteries that could store more energy for their size and be less prone to overheating — though turning that promise into affordable mass production has proved difficult.

Why a Standard Matters

Common definitions. A standard clarifies what can legitimately be called a solid-state battery, cutting through marketing claims.

Safety testing. Agreed test methods let carmakers, regulators and buyers compare products fairly.

Faster adoption. Suppliers and manufacturers can design to one set of requirements instead of many, which helps technology move from pilot lines to factories.

Other Signs of Momentum

Ronbay Technology's 10-tonne solid-state electrolyte project in Xiantao passed its environmental assessment, with an investment of RMB 50 million aimed at sulfide electrolyte production.
SEVC Power, a solid-state battery company, announced on 26 August that it had completed external financing worth several hundred million yuan.

Key Terms, Simply Explained

Electrolyte: the material that lets charged particles move between a battery's two electrodes.
Solid electrolyte: a solid material — such as a ceramic, polymer or sulfide compound — used in place of a liquid.
Sulfide electrolyte: one of the leading families of solid electrolyte materials being developed for electric vehicle batteries.
Energy density: how much energy a battery stores for its weight or size — a major factor in how far an EV can travel on a charge.

Keeping Expectations Realistic

A standard proposal is the start of a process, not a finished rulebook; IEC standards typically take time to draft and agree. And most electric cars on the road for the next several years will still use conventional lithium-ion batteries, which continue to improve and fall in price.

The market these batteries will serve is growing fast — see global EV sales reaching 1.83 million in August and the renewable electricity that increasingly powers them.

Sources

"World's first solid-state battery international standard initiated," Shanghai Metals Market — news.metal.com
"Three landmark events reshape solid-state battery landscape," Shanghai Metals Market — news.metal.com
"Solid-state batteries 2026–2036: technology, forecasts, players," IDTechEx — idtechex.com

iec solid-state battery (1)

Solid-State Batteries Get Their First International Standard Proposal