Honjo state and ShinMaywa Industries Jointly Develop "Tri-Guard Structure," a New Three-Layer Integrated Design for Battery Fire Countermeasures
Honjo state and ShinMaywa Industries have jointly developed the "Tri-Guard structure," a new three-layer integrated safety design to combat battery fires by simultaneously suppressing flames, heat, and smoke. Amid rising risks of lithium-ion battery fires, they aim to implement this in industrial sectors and co-develop application-specific products, contributing to enhanced societal safety and disaster mitigation.
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- 📰 Published: March 30, 2026 at 19:00
- 🔍 Collected: March 30, 2026 at 22:56 (3h 56m after Published)
- 🤖 AI Analyzed: April 22, 2026 at 23:21 (552h 25m after Collected)
Honjo state Co., Ltd. (Headquarters: Osaka City, Osaka Prefecture) has jointly developed the "Tri-Guard structure" as a new safety design for battery fire countermeasures, in collaboration with ShinMaywa Industries, Ltd. (Headquarters: Takarazuka City, Hyogo Prefecture).
Moving forward, we will promote its implementation in industrial fields and the joint development of application-specific products.
## Background (Social Issues)
In recent years, fires caused by lithium-ion batteries have occurred in various locations such as airports, commercial facilities, logistics sites, and transportation systems.
Battery fires are characterized by their sudden onset and rapid spread, often accompanied by large amounts of smoke and toxic gases, posing risks of environmental impact and secondary damage.
However, flame countermeasures, heat insulation measures, and smoke exhaust measures are often implemented individually, and a structure that integrally suppresses flames, heat, and smoke is not yet sufficiently established.
Against this background, there is a growing need for new safety designs to suppress the spread of damage in the event of a fire.
## What is the "Tri-Guard structure"?
The "Tri-Guard structure" developed by both companies is a three-layer integrated safety structure aimed at simultaneously suppressing flames, heat, and smoke (toxic gases) generated during a fire, with the goal of extinguishing the fire and reducing the risk of environmental impact and secondary damage.
- Smoke barrier layer: Suppresses the spread of smoke and harmful gases to the outside.
- Insulation layer: Delays the transfer of high temperatures generated internally to the outside, suppressing heat diffusion.
- Flame barrier layer: Confines the fire source and suppresses the spread of fire to the surroundings.
This structure adopts a combination of Honjo state's ultra-heat-resistant high silica sheet*1 and insulation materials using recycled carbon fiber*2, which are being researched and developed by ShinMaywa Industries and Fuji Kasei Co., Ltd.
*1 A high silica fiber sheet boasting a maximum heat resistance of 1800℃ and excellent flexibility.
*2 Uses carbon fiber, which has a higher heat resistance than glass fiber insulation materials.
## Future Developments
Based on the Tri-Guard structure, we aim to improve societal safety and contribute to disaster mitigation as a countermeasure against the increasing risk of battery fires, which is a concern with the advancement of electrification.
Moving forward, we will promote its deployment in environments where ignition risks are anticipated, such as charging areas and battery storage spaces in logistics warehouses, and vehicle equipment.
Keywords: Lithium-ion battery, mobile battery, fire, ignition, thermal runaway, disaster prevention, charging facilities, EV, logistics, facilities
Moving forward, we will promote its implementation in industrial fields and the joint development of application-specific products.
## Background (Social Issues)
In recent years, fires caused by lithium-ion batteries have occurred in various locations such as airports, commercial facilities, logistics sites, and transportation systems.
Battery fires are characterized by their sudden onset and rapid spread, often accompanied by large amounts of smoke and toxic gases, posing risks of environmental impact and secondary damage.
However, flame countermeasures, heat insulation measures, and smoke exhaust measures are often implemented individually, and a structure that integrally suppresses flames, heat, and smoke is not yet sufficiently established.
Against this background, there is a growing need for new safety designs to suppress the spread of damage in the event of a fire.
## What is the "Tri-Guard structure"?
The "Tri-Guard structure" developed by both companies is a three-layer integrated safety structure aimed at simultaneously suppressing flames, heat, and smoke (toxic gases) generated during a fire, with the goal of extinguishing the fire and reducing the risk of environmental impact and secondary damage.
- Smoke barrier layer: Suppresses the spread of smoke and harmful gases to the outside.
- Insulation layer: Delays the transfer of high temperatures generated internally to the outside, suppressing heat diffusion.
- Flame barrier layer: Confines the fire source and suppresses the spread of fire to the surroundings.
This structure adopts a combination of Honjo state's ultra-heat-resistant high silica sheet*1 and insulation materials using recycled carbon fiber*2, which are being researched and developed by ShinMaywa Industries and Fuji Kasei Co., Ltd.
*1 A high silica fiber sheet boasting a maximum heat resistance of 1800℃ and excellent flexibility.
*2 Uses carbon fiber, which has a higher heat resistance than glass fiber insulation materials.
## Future Developments
Based on the Tri-Guard structure, we aim to improve societal safety and contribute to disaster mitigation as a countermeasure against the increasing risk of battery fires, which is a concern with the advancement of electrification.
Moving forward, we will promote its deployment in environments where ignition risks are anticipated, such as charging areas and battery storage spaces in logistics warehouses, and vehicle equipment.
Keywords: Lithium-ion battery, mobile battery, fire, ignition, thermal runaway, disaster prevention, charging facilities, EV, logistics, facilities