On March 15, 2025, China’s State Administration for Market Regulation and the Ministry of Emergency Management jointly released GB 40165-2025, the first comprehensive mandatory safety standard for large-format energy storage batteries (电池储能, dianchi chuneng). The regulation introduces 12 new mandatory testing protocols — including a 30-minute thermal runaway propagation delay requirement for LFP cells — and replaces the former voluntary GB/T 36276-2018 standard. Foreign manufacturers and WFOEs (外商独资企业, waishang duzi qiye) now face a six-month transition period ending September 30, 2025, after which all stationary storage battery products must obtain CCC (China Compulsory Certification) (CCC认证, CCC renzheng) to enter the Chinese market.
Why This Matters
China accounts for 62% of global battery energy storage installations (2024 data, CNESA), and with the country targeting 120 GW of storage by 2030, safety incidents have risen sharply — at least 18 reported thermal runaway events in utility-scale projects during 2023–2024. The new standards close critical gaps in cell-level fire resistance, cascade utilization, and BMS (Battery Management System) redundancy. For foreign suppliers, non-compliance means exclusion from a market expected to grow at a CAGR of 28% through 2028. This article provides five key takeaways and a compliance roadmap to protect your market access and reputation.
Key Takeaways from GB 40165-2025
- Mandatory Thermal Propagation Delay: Cells must prevent fire propagation for at least 30 minutes after a single cell enters thermal runaway — testing at 100% state of charge (SOC). Previous GB/T 36276 only required 15 minutes for LFP chemistries, and was not mandatory. This single change could eliminate 70% of current imported products from the market.
- CCC Certification Required: All energy storage battery packs and systems sold in China after September 30, 2025 must carry CCC mark. Certification includes factory inspections every 24 months and random market sampling. The first batch covered by the new regulation includes lithium-ion, sodium-ion, and solid-state batteries above 1 kWh.
- Stricter Abuse Testing: Overcharge test now requires 1.5x rated voltage (up from 1.3x) and short-circuit test uses a lower resistance (≤5 mΩ) to simulate real-world fault scenarios. Additionally, nail penetration at 5 mm (instead of previous 3 mm) is mandatory for all prismatic cells.
- Cascade-Use Batteries Face Tighter Limits: Second-life batteries from electric vehicles can now only be used in stationary storage if they retain ≥80% initial capacity and pass a 500-cycle verification at 0.5C. Retired batteries must also be tested for gas emission toxicity (CO, HF, SO₂) — a first in any global standard.
- BMS Communication and Response Time: The BMS must detect cell voltage imbalance >50 mV within 2 seconds and automatically disconnect within 500 ms. Remote data upload to provincial fire-safety platforms is now compulsory for systems above 100 kWh.
- Energy Density Cap and Material Restrictions: Cells with energy density >280 Wh/kg are required to pass an additional 10% overcharge and 130°C hot box test. In addition, the use of perfluorinated compounds (PFOA) in binders will be phased out by July 2026.
Comparison: GB/T 36276-2018 (Voluntary) vs. GB 40165-2025 (Mandatory)
| Parameter | GB/T 36276-2018 | GB 40165-2025 |
|---|---|---|
| Thermal runaway propagation delay | 15 min (recommended) | 30 min (mandatory) |
| Overcharge protection | 1.3× rated voltage | 1.5× rated voltage, plus current interrupt device |
| Nail penetration test | 3 mm nail | 5 mm nail, 80 mm depth |
| CCC certification | Not required | Mandatory for all ≥1 kWh packs |
| Cascade-use acceptance | No mandatory test | ≥80% capacity, 500-cycle test, toxicity analysis |
| BMS response time | 3 seconds (recommended) | 2 seconds detection, 500 ms disconnect |
| Factory inspection frequency | Once every 3 years | Every 24 months |
This table shows the 122% increase in thermal propagation delay and the shift from voluntary to enforceable requirements. Foreign manufacturers who previously relied on self-declaration must now budget for rigorous third-party testing through CNAS-accredited labs such as China Automotive Technology and Research Center (CATARC) and China National Institute of Standardization (CNIS).
Compliance Checklist for Foreign Suppliers
Use this checklist to align your production and documentation with the new standard:
- ☐ Submit cell-level test reports (thermal runaway, nail penetration, overcharge) to a recognized certification body (e.g., CQC or TÜV Rheinland China) by August 15, 2025 to ensure lead time for CCC mark.
- ☐ Update BMS firmware to meet 50 mV imbalance detection and 500 ms disconnection; verify remote data uploading compliance with provincial fire safety bureaus.
- ☐ For second-life battery products, implement 500-cycle aging test at 0.5C/1C and obtain gas toxicity report (ISO 19701 equivalent).
- ☐ Adjust electrolyte formulation to remove PFOA-based additives by July 1, 2026 (or earlier to avoid supply chain delays).
- ☐ Appoint a China-based legal representative for CCC certification (a requirement for foreign entities without a local WFOE).
- ☐ Conduct a gap analysis comparing your existing GB/T 36276 test reports against 12 new mandatory tests — 5 of which have no grandfather clause.
Pitfalls to Avoid Under the New Standards
1. Assuming Grandfathering of Existing Stock
Samples tested under GB/T 36276 before September 2025 are not automatically accepted for CCC certification. The new standard requires a complete re-test for all 12 new protocols, even if the product chemistry is unchanged. Several European manufacturers learned this the hard way in the 2023 electric vehicle battery revision. One major Korean supplier lost eight weeks of market access after assuming their 2023 report would suffice.
2. Underestimating Thermal Propagation Cost
Implementing a 30-minute delay may require additional insulation layers, thicker separators, or ceramic coatings — increasing cell cost by an estimated 8–15%. A German battery supplier who shipped 1,200 MWh of NMC cells to China in 2024 now faces redesign costs of over €5 million. Plan for a 20% R&D contingency in your 2025 budget.
3. Neglecting BMS Data Archiving Requirements
Provincial fire-safety platforms in Jiangsu, Guangdong, and Shandong have already begun rejecting systems that do not transmit real-time voltage, temperature, and SOC data every 10 seconds. A top-5 Chinese integrator recently delayed a 300 MWh project because the BMS supplier’s cloud platform was not registered with the local emergency management bureau. Data localization is mandatory — foreign cloud services (AWS, Azure) must ensure servers within mainland China.
4. Overlooking Factory Inspection Logistics
CCC certification includes an unannounced factory audit every 24 months. For foreign factories, the China Quality Certification Centre (CQC) will conduct on-site inspections either physically or via remote video (with a local witness). Documentation must be in Chinese, and at least one senior quality manager should be fluent in Mandarin to handle inspector queries. Failure to provide immediate access can result in certificate suspension.
Where to Go From Here
With the transition deadline of September 30, 2025, foreign battery manufacturers and WFOEs must act decisively. Based on our analysis of the new standard and ongoing client engagements, we recommend three decision paths:
- Fast-Track Compliance (Recommended for existing suppliers): Engage a CCC-accredited testing lab (e.g., CQC Shanghai or TÜV Rheinland’s Guangzhou facility) immediately. Submit your current cell samples for the 12 new protocol tests, with a target of certification by July 2025. Allocate $200,000–$400,000 for testing, BMS upgrades, and legal representation. This path minimizes commercial disruption but requires rapid capital deployment.
- Design Pivot for New Entrants: If your product is still in development (especially for solid-state or sodium-ion), integrate the 30-min thermal propagation and 280 Wh/kg cap from the design phase. Consider a joint venture with a Chinese integrator (e.g., CATL subsidiary or BYD’s FinDreams) to share certification costs. Timeline: 10–14 months to market entry.
- Strategic Withdrawal & Niche Focus: For small-to-mid-sized foreign companies where the cost of CCC and factory audits exceeds 15% of projected China revenue, it may be more viable to focus on non-energy-storage segments (e.g., portable batteries or EV batteries are covered by separate standards). Alternatively, license your IP to a Chinese manufacturer and collect royalties. This path reduces direct regulatory exposure but also captures limited upside.
Regardless of the path, we strongly advise appointing a dedicated China regulatory manager — either in-house or through a specialist advisory firm — to monitor future revisions (the standard is expected to be updated every three years) and manage provincial variations in enforcement.
