Application guide · battery / ESS

Flame-Retardant EPP Foam for EV Battery & Energy Storage

Battery packs and energy-storage systems need foam that does four jobs at once: cushion the cells, hold them precisely in place, help manage temperature, and add structural support — all while staying light and meeting fire-safety requirements. DBM molds flame-retardant EPP structures (e.g. UL94 V-0/V-2 material grades) for EV battery packs and ESS containers.

What molded EPP does inside a battery pack

Cushioning & vibration isolation — absorbs shock and vibration in transport and use.
Cell positioning — holds cells precisely and accommodates the swelling of pouch cells during charge/discharge.
Thermal management — closed-cell insulation; flame-retardant grades help slow heat spread.
Structural integrity — adds structure while keeping weight low.

Flame retardancy & key specs

Property	Value
Flame-retardant grade	Available — e.g. UL94 V-0 / V-2 material ratings
Service temperature	up to +130 °C
Shape recovery	>95% after impact (not ISO 8307 ball rebound)
Recyclable	100%

⚠️

Honest scope. "UL94 V-0/V-2" is a material flammability rating, not a "UL listing/certification" of the finished pack — we do not claim the latter unless verified. Flame-retardant EPP is a supporting insulating/structural component; it helps slow heat spread between cells but is not a stand-alone thermal-runaway barrier. Relevant standard: China's GB 38031-2025 EV battery safety standard (effective 2026) requires no fire/explosion after thermal runaway — flame-retardant structural parts support that overall design.

Molded EPP vs. poured / foam-in-place

The industry also uses poured PU or silicone for battery thermal protection. DBM focuses on molded flame-retardant EPP structural parts, whose differentiators are:

Cushioning + precise positioning + light weight, integrated in one molded part
100% recyclable — a better fit for sustainable supply chains
High-volume, dimensionally consistent, ready to assemble

Applications

EV battery pack cushioning & positioning
Energy-storage system (ESS) container structures
Battery module thermal & impact protection
Temperature-sensitive component support

Why work with DBM

EPP foam structures for battery and energy-storage projects — cushioning, positioning and thermal-management support — one-stop from material → design → tooling → molding → inspection → delivery.

Two bases · 45,000 m² 5,000 T / yr capacity 99.5% outgoing acceptance

FAQ

Is EPP foam flame retardant?

Standard EPP is not, but flame-retardant EPP grades are available (e.g. UL94 V-0/V-2 material ratings).

What temperature can the EPP handle?

DBM's EPP structures are rated to +130°C.

Does EPP help with thermal runaway?

Flame-retardant EPP's closed-cell insulation can help slow heat spread between cells, supporting the pack's overall safety design (see GB 38031-2025). It is a supporting component, not a stand-alone thermal-runaway barrier.

Can EPP parts be recycled?

Yes, EPP is 100% recyclable.

Designing a safer, lighter battery or ESS enclosure?

Send your module layout, fire-safety target and volume — we'll propose a molded flame-retardant EPP structure.

Get a quote from DBM →