Jet flame shield for protection against battery thermal runaway

A three-layered jet flame shield with a mechanically bonded carbon fiber middle layer and inert outer layers impregnated with a thermoset binder addresses the limitations of mica shields, offering improved durability and gas management during thermal runaway events in battery systems.

WO2026125371A1PCT designated stage Publication Date: 2026-06-18AUTONEUM MANAGEMENT AG
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
AUTONEUM MANAGEMENT AG
Filing Date
2025-12-09
Publication Date
2026-06-18

AI Technical Summary

⚠Technical Problem

Existing battery flame shields, particularly those made of mica, are unable to withstand the intense heat and jet fires associated with thermal runaway events in battery systems, are environmentally unsustainable, and occupy excessive space, necessitating a lighter, more durable, and space-efficient alternative.

⚗Method used

A jet flame shield composed of three fibrous layers, including a mechanically bonded nonwoven carbon fiber middle layer sandwiched between two inert fibrous layers, impregnated with a thermoset binder, providing enhanced durability and resistance to thermal runaway events.

🎯Benefits of technology

The shield significantly increases the time before perforation during a thermal runaway event, reduces the risk of electric shorts, and guides gas emissions effectively, while being environmentally friendly and space-efficient.

✦ Generated by Eureka AI based on patent content.

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  • Figure EP2025086126_18062026_PF_FP_ABST
    Figure EP2025086126_18062026_PF_FP_ABST
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Abstract

Jet flame shield for a battery of an electric vehicle, comprising at least 3 fibrous layers, a middle fibrous layer sandwiched between two inert fibrous layers, obtainable by superposition of the at least 3 layers and penetrating all layers with a thermoset binder to form a substantially closed shield, and whereby the middle fibrous layer is a mechanically bonded nonwoven layer of carbon fibers.
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