Automakers preparing to ship the first solid-state electric vehicle batteries now face a fixed regulatory deadline. China’s updated mandatory safety standard for EV traction batteries, GB 38031-2025, takes effect on July 1, 2026, setting binding test requirements just as manufacturers across Asia push prototype cells toward mass production. At the same time, a separate national work item has opened the first formal effort to define what “solid-state battery” even means in Chinese regulatory language, with drafting led by the country’s largest cell makers. Together, the two moves lock down both the safety rules and the vocabulary that will govern next-generation EV batteries sold in the world’s biggest auto market.
What is verified so far
The clearest fact on the table is the enforcement date. The official entry for GB 38031-2025 in the national standards registry lists an implementation date of 2026-07-01. The standard was published by the State Administration for Market Regulation (SAMR) and the Standardization Administration of China (SAC), with the Ministry of Industry and Information Technology (MIIT) serving as the supervising department. These governance details matter because MIIT controls vehicle type-approval in China: any EV battery pack that fails GB 38031-2025 testing after July 2026 cannot legally enter a production vehicle.
The revised standard adds concrete new test protocols. According to a report on the central government’s State Council portal, GB 38031-2025 introduces a bottom-impact test and tightens thermal-diffusion requirements, including updated temperature thresholds and observation-time parameters. These changes reflect real-world failure modes: underfloor strikes from road debris and thermal runaway propagation between cells are the two scenarios most likely to cause battery fires in service. By explicitly adding and strengthening tests in these areas, regulators are signaling that they expect pack designs to withstand both mechanical shocks and internal fault cascades without catastrophic outcomes.
Running in parallel is a brand-new standards-planning effort focused specifically on solid-state cells. The work item numbered 20250835-T-339 appears in the national standards plan database under the title “Solid-state battery for electric vehicle, Part 1: Terms and classification.” Its responsible technical committee is TC114/SC27, and MIIT again serves as the supervising ministry, indicating that the same policy apparatus overseeing traction-battery safety is also shaping the definitional framework for solid-state technology. The drafting organizations listed in the plan record include CATARC (the China Automotive Technology and Research Center), CATL, Gotion High-Tech, and BYD. That roster means the companies building the cells are also writing the definitions that regulators will use to classify them.
What remains uncertain
Several important details are still missing from the public record. The full text of GB 38031-2025, including specific pass/fail thresholds for the new bottom-impact and thermal-diffusion tests, has not yet appeared in the SAMR registry. Without those numbers, battery engineers at smaller suppliers cannot begin validating their pack designs against the exact criteria they will face in mid-2026. Large incumbents involved in the drafting process may already understand the intended parameters, but there is no public documentation that would let outside firms benchmark their designs with confidence. Whether MIIT or CATARC will publish interim guidance before the standard takes effect is unclear.
The relationship between the two regulatory tracks also lacks an official explanation. GB 38031-2025 governs all EV traction batteries, including liquid-electrolyte lithium-ion packs that dominate today’s market. The solid-state terminology standard (20250835-T-339) is still at the planning stage, with no published draft or projected completion date in the plan metadata. It is not yet clear whether solid-state packs will need to satisfy additional test procedures beyond those in GB 38031-2025, or whether the terminology standard will simply create classification labels that map onto the existing safety tests. No public statement from MIIT or CATARC addresses how the two documents will interact once both are finalized, leaving open questions about whether “solid-state” status will trigger differentiated regulatory treatment.
Equally uncertain is which specific cell chemistries and form factors informed the new test methods. CATL and BYD are both widely reported to be developing sulfide-based and oxide-based solid electrolyte designs, but the available government records do not disclose what kinds of prototype packs, if any, were used to validate the revised bottom-impact or thermal-diffusion protocols. Without that disclosure, it is impossible to say whether the new tests are tuned to the behavior of conventional liquid-electrolyte cells, early solid-state architectures, or a compromise intended to cover both. That ambiguity will matter for developers whose designs differ significantly from the mainstream approaches favored by the largest Chinese manufacturers.
How to read the evidence
The strongest evidence available comes from two government registry databases. The SAMR/SAC standards platform provides the official metadata for GB 38031-2025, including its implementation date, publishing bodies, and supervising ministry. As a primary administrative record, it is authoritative for dates, document identifiers, and institutional responsibilities, even though it does not yet host the full technical text. The national standards plan database provides equivalent metadata for the solid-state terminology work item, confirming its scope, responsible technical committee, and the list of drafting organizations. Together, these registries establish that China has locked in a firm enforcement timeline for traction-battery safety while simultaneously tasking a specialized committee with defining solid-state terminology.
The State Council portal report adds descriptive detail about the content of GB 38031-2025, naming the bottom-impact test and thermal-diffusion changes and situating them in the broader push to improve EV safety. Because it is hosted on a government domain and attributed to official sources, it carries strong credibility for the existence of those test categories and the general direction of the revisions. It does not, however, reproduce the full technical clauses, so the precise engineering parameters-such as impact energy levels, allowable deformation, or maximum propagation temperatures-remain unconfirmed from primary documentation. Until the full text is released, any attempt to reverse-engineer those values from secondary commentary would be speculative.
For industry stakeholders, the most prudent reading is that the timeline and institutional structure are fixed, while the fine-grained technical content is still opaque to anyone outside the drafting circle. Automakers and battery suppliers can treat July 1, 2026, as a hard deadline for demonstrating compliance with a tougher baseline of mechanical and thermal safety. They can also assume that solid-state products will not be exempt from these requirements and may eventually acquire additional classification rules once the terminology standard moves from planning to drafting and, ultimately, to publication.
At the same time, the absence of public thresholds and the undefined relationship between the two standards create real planning risk, especially for smaller firms and foreign joint ventures that lack direct representation on TC114/SC27. These players must decide how aggressively to invest in pack designs and validation campaigns without knowing exactly where the regulatory bar will be set. The available evidence does not resolve that uncertainty; it only confirms that the bar is rising and that the largest domestic manufacturers are helping to decide its height.
As more documents emerge-particularly the full text of GB 38031-2025 and any draft circulated for the solid-state terminology standard-the evidentiary picture will sharpen. For now, the administrative records and the State Council summary together support a cautious conclusion: China is moving ahead on a coordinated schedule to tighten EV battery safety and to formalize the language around solid-state technology, but the technical and competitive implications of that shift will remain partly obscured until the underlying standards are fully published.
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*This article was researched with the help of AI, with human editors creating the final content.
