I. New Fire Protection Regulations for the Energy Storage Industry Take Effect, Ushering in an Era of Mandatory Compliance for Cabin Thermal Insulation and Fire Protection

As large-scale wind-solar power bases, commercial & industrial energy storage, and residential energy storage projects are being deployed at scale, energy storage containers and prefabricated cabins are long-term installed in extreme environments such as deserts, mountainous areas, and open-air exposure. Lithium batteries inside the cabins are highly sensitive to temperature. Ambient high temperatures accelerate battery degradation, shorten cycle life, and thermal runaway of battery cells can more easily trigger cascading combustion and explosions. Class A fire protection and long-term thermal insulation have become mandatory requirements for energy storage project design.

Domestic and international energy storage safety regulations continue to tighten, with multiple national standards formally implemented in recent years and 2026, establishing clear mandatory requirements for the fire resistance rating of energy storage cabin enclosure structures and fire partitions:

1. Domestic National Standards System

· GB/T 42288-2022 "Safety Regulations for Electrochemical Energy Storage Power Stations": Fire resistance rating of storage enclosure ≥1h;

· GB/T 44026-2024 "Technical Specifications for Prefabricated Cabin-Type Lithium-Ion Battery Energy Storage Systems": Enclosure structure fire resistance ≥1h;

· GB/T 51048-2025 "Design Standard for Electrochemical Energy Storage Power Stations" (effective 2026-04-01): Battery prefabricated cabins require ≥1h fire resistance, while factory firewalls must achieve a 4h fire resistance rating; The regulations clearly specify that the combustion performance of insulation and lining fireproof materials in energy storage cabins must reach Class A non-combustible, with fire partition walls and cabin separations having a fire resistance rating of no less than 1 hour, and fire resistance tests uniformly conducted in accordance with the GB/T 9978 series of standards.

2. Mainstream International Energy Storage Access Standards

· U.S. NFPA 855 Energy Storage Standard: Battery clusters and cabin partition walls require fire resistance ≥2h, with mandatory passage of UL9540 and UL9540A thermal runaway propagation testing; Large-scale energy storage projects in California and New York additionally require LSFT large-scale fire testing verification;

· EU EN series standards: EN13501 classifies component fire resistance EI60/EI120 ratings, with EN1363 providing unified fire test methods; Energy storage cabins in Germany and France are mandatorily equipped with 1h+ fire-resistant insulation structures.

Traditional rock wool, ceramic fiber, and ordinary aerogel have prominent shortcomings under high-temperature conditions: The thermal conductivity of rock wool increases sharply at 800℃, with severe insulation degradation; Ordinary aerogel shrinks significantly at high temperatures and tends to powder and shed over long-term use, failing to meet the requirements for 120-minute long-term fire resistance and stable operation. WH Thermal Technology has developed the WHMF-41 Nano High-Temperature Insulation Board specifically for energy storage prefabricated cabins and storage cabinets, perfectly matching domestic and international energy storage fire protection compliance requirements and becoming the core insulation material for energy storage cabin enclosures and fire partitions.

II. WHMF-41 Nano High-Temperature Insulation Board: Nano-Microporous Structure Blocks Heat Transfer Through Three Mechanisms

WHMF-41 nano insulation board uses 7~12nm fumed silica powder as the core base material, compounded with high-temperature resistant inorganic fibers and SiC/Zr₂O infrared opacifiers. After precise proportioning, it is integrally formed at high temperature, with the exterior fully wrapped in fiberglass fabric, internally forming a 90% high-porosity nano-microporous structure that simultaneously cuts off three heat transfer paths: conduction, convection, and radiation:

1. Blocking solid heat conduction: Ultra-fine nano powder elongates the solid heat transfer path, significantly reducing solid-phase thermal conductivity;

2. Suppressing gas convective heat transfer: The internal micropore size is smaller than the mean free path of air molecules, preventing free air convection and reducing heat exchange at the source;

3. Blocking high-temperature infrared radiation: Special inorganic opacifiers are added to reflect high-temperature infrared radiation, greatly reducing radiative heat transfer under high-temperature conditions.

Relying on its unique nano-structure, the product's insulation performance is 3~4 times that of traditional insulation materials such as rock wool and ceramic fiber. Under the same fire resistance and insulation effect, the board thickness can be significantly reduced, balancing lightweight design, high safety, and cabin space utilization.

III. Comprehensive Core Performance Parameters, Meeting EI60/EI120 Fire Resistance Grading Requirements

1. Basic Physical and Chemical Indicators

2. Fire Resistance Grading Matching Solutions

In line with domestic energy storage standards and the European EN13501 standard, WHMF-41 can meet different fire resistance duration requirements:

· EI60 (1h fire resistance): 12mm standard board, suitable for conventional storage enclosures and residential storage cabin enclosures;

· EI90 (1.5h fire resistance): 15mm thickened board, suitable for commercial & industrial energy storage and battery compartment partitions;

· EI120 (2h fire resistance): 20mm thickened board, meeting the requirements of overseas NFPA855 and large-scale energy storage power station firewalls.

As verified by the National Ceramic and Refractory Materials Testing Center, WHMF-41 fire resistance tests can maintain integrity and insulation for a full 120 minutes, with the back-face temperature rise strictly meeting standards, fully complying with GB/T9978 and EN1364 fire resistance testing standards. The accompanying test reports carry CNAS and MA authoritative qualifications and can be directly used in domestic and international energy storage project bidding.

3. Core Advantages Over Traditional Insulation Materials

1. Stable High-Temperature Performance: At 800℃, thermal conductivity is far lower than rock wool, with no significant performance degradation, and it is less prone to failure under thermal runaway high-temperature impact;

2. Long-Lasting Durability with Low Maintenance: Inorganic material is corrosion-resistant, non-aging, and does not powder or settle, with a service life far exceeding that of aerogel and rock wool, greatly reducing long-term maintenance costs for energy storage power stations;

3. Thin, Lightweight, and Space-Enhancing: Under the same insulation effect, thickness is halved, freeing up cabin space and increasing energy storage system installation capacity; simultaneously, the board's lightweight nature reduces overall cabin load and lowers transportation and installation costs;

4. Easy Installation: Supports 2.8-meter extra-long one-piece board customization, reducing splicing gaps, with a clean and dust-free board surface. On-site cutting and assembly are simple, shortening the project construction cycle;

5. Worry-Free Export Compliance: Certified with EU CE, RoHS, and REACH, contains no hazardous substances, meeting the UL and NFPA access standards for overseas energy storage projects in Europe, the Americas, and Southeast Asia.

IV. Multi-Scenario Energy Storage Applications, Covering All Types of Energy Storage Cabins and Cabinets

WHMF-41 Nano High-Temperature Insulation Board is specifically designed for energy storage enclosures and fire partitions, suitable for all categories of energy storage equipment:

1. Inner and Outer Enclosures of Energy Storage Prefabricated Cabins Installed on the inner side of the cabin's steel plates, it insulates against summer sun exposure high temperatures and winter cold, stabilizing the battery operating temperature inside the cabin and reducing air conditioning temperature control energy consumption; In the event of thermal runaway of battery cells, it blocks the spread of high temperatures outward, protects the cabin steel structure from collapse, and buys sufficient time for firefighting response and personnel evacuation.

2. Fire Partition Walls Between Battery Clusters Using EI120 grade 20mm nano boards as partition barriers, blocking thermal runaway of a single battery cluster from spreading to adjacent clusters, meeting the mandatory domestic standard 1h and U.S. standard 2h fire partition requirements, and avoiding major safety incidents of cascading explosions.

3. Residential / Commercial & Industrial Battery Cabinet Liners 12/15mm thin boards are suitable for the confined spaces of small battery cabinets. The Class A non-combustible material prevents internal fire spread within the cabinet, meeting domestic energy storage safety regulations and UL9540 residential energy storage fire testing requirements.

4. Energy Storage Plant Firewalls and Fire Compartments Thickened custom boards can achieve a 4h fire resistance rating, matching the mandatory standard of GB/T 51048-2025 for plant firewalls, suitable for the construction of large-scale energy storage production workshops and centralized energy storage power station fire compartments.

This product has already been mass-supplied to leading energy storage system manufacturers such as CATL, Huawei Digital Power, Sungrow, and China Guodian, with deployments in domestic wind-solar energy storage bases and overseas energy storage projects in North America and Europe, having passed UL9540A thermal runaway actual testing and full national standard fire resistance verification.

V. Enterprise Large-Scale Production Capacity and Full-Process Technical Services, Ensuring Stable Supply for Energy Storage Projects

WH Thermal Technology (Shanghai) Co., Ltd., established in 2013, is a high-tech and specialized & sophisticated enterprise integrating R&D, production, and customized solution delivery of nano insulation materials, providing stable and reliable integrated fireproof and insulation solutions for the energy storage industry.

1. Dual-Base Large-Scale Production Capacity Shanghai headquarters + two production bases in Nantong, Jiangsu and Jingmen, Hubei, with a total factory area of over 30,000 ㎡, equipped with 16 automated professional production lines, producing millions of square meters of nano insulation boards annually. It can undertake annual bulk orders for large-scale energy storage projects with a stable and controllable supply cycle.

2. Comprehensive Technical R&D and Qualification Barriers Holding 56 independent intellectual property rights, with a dedicated R&D center in Kunshan capable of conducting joint thermal runaway and fire resistance testing with energy storage companies; Full sets of ISO9001/14001/45001 three-system, intellectual property management system, and EU CE certifications, with all products accompanied by CNAS authoritative test reports, fully equipped for bidding.

3. Global Service Coverage With over a decade of deep industry experience, having served more than 5,000 domestic and international companies, with products exported to over 20 countries, covering energy storage, new energy vehicles, aerospace, metallurgical industry, petrochemical, power and high-speed rail, and many other fields;

4. One-Stop Supporting Services Providing a full chain of services including free fireproof and insulation condition assessment for energy storage cabins, fire resistance solution design, sample testing, size custom cutting, and on-site construction technical guidance, with rapid response to the technical needs of energy storage design institutes, system integrators, and material procurement departments.

VI. Industry Development Outlook

As global energy storage safety regulations continue to upgrade, the requirements for energy storage cabin fire resistance, thermal insulation, and lightweighting are constantly increasing. Traditional insulation materials will gradually be replaced by high-performance nano-microporous insulation boards. WH Thermal Technology will continue to iterate the WHMF series of nano insulation boards for energy storage applications, optimizing the technical roadmap of high-temperature fire resistance, lightweighting, and cost-effectiveness, while simultaneously adapting to new domestic national standards and overseas UL, NFPA, and EN energy storage access standards. With large-scale production capacity, mature implementation cases, and one-stop thermal management solutions, we are building a solid safety defense line for global energy storage projects and supporting the safe, low-carbon, and high-quality development of the energy storage industry.