Low-Density Flame-Retardant PU for Soft-Pack Battery Encapsulation
Product Description
BZ-6801-22-H is a two-component polyurethane encapsulant tailored for new-energy soft-pack battery modules, combining low density, UL94 V0 rating, and superior flowability to ensure thorough filling and sealing of cell assemblies. Featuring a 1:1 mix ratio by weight and Shore A 60±5 hardness, it delivers lightweight protection and effective thermal management while meeting rigorous safety norms. Fully RoHS/REACH-compliant, this formulation suits global markets and environmentally responsible applications.
Key Product Features
1.Lightweight Formulation: Mixed density of 1.09±0.03 g/cm³ lowers module mass, boosting energy density and extending EV/portable storage range.
2.V0 Fire Safety: Certified UL94 V-0 vertical burn rating, ensuring critical fire protection for high-energy battery systems.
3.Superior Flow: Initial viscosity 400–700 mPa·s enables complete filling of narrow gaps between cells and frames, preventing voids and enhancing thermal uniformity.
4.Fast Production Cure: Fully sets in 2.5–3.5 h at 25°C, or ≤40 min at 60°C, streamlining manufacturing without compromising bond integrity.
5.Broad Thermal Endurance: Stable from -40°C to 120°C, performing reliably under both frigid conditions and high-temperature charging.
Technical Parameters
|
Parameters
|
Hardener
BZ-6801-22-H A
|
Resin
BZ-6801-22-H B
|
|
Before curing
|
Appearance
|
Light yellow
clear liquid
|
Light yellow liquid
|
|
Viscosity(mPa·s.25℃)
|
150-250
|
1300-1650
|
|
Initial mixed viscosity(mPa·s.25℃)
|
400-700
|
|
Mixed density(g/cm³.25℃)
|
1.09±0.03
|
|
Mixing
&
Curing
|
Mix ratio(by weight)
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A:B=1:1
|
|
Pot life 130±30g(min.25℃)
|
8-10 min
|
|
Curing condition
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Room temperature curing
|
|
Surface drying time 30g(min.25℃)
|
45-60 min
|
|
Curing time 30g(H.25℃)
|
2.5-3.5
|
|
Curing time(Heated)
|
60℃ heated ≤40 min
|
|
After curing
|
Color
|
Light yellow
|
|
Hardness (Shore A)
|
60±5
|
|
Temperature resistance(℃)
|
-40~120℃
|
|
Flame retardancy UL94
(Vertical burning)
|
V0
|
|
Water absorption(24H)
|
≤0.5%
|
|
Volume resistivity(Ω.cm)
|
≥1.0×1011
|
|
Tensile strength(Mpa)
|
1.9
|
|
Tensile shear strength(Mpa)(Al-Al)
|
1.7
|
|
Elongation at break(%)
|
≥50%
|
|
Breakdown voltage(kV/mm)
|
≥15
|
Product Applications
- Battery Cell Gap Filling: Fills narrow inter-cell gaps, boosting thermal conductivity and reducing hot spots during charge/discharge.
- Module Structural Sealing: Seals modules against moisture and physical impact, ensuring EV/energy-storage durability.
- Thermal Interface Material: Lightweight thermal bridge between cells and cooling plates, enhancing heat dissipation and battery life.
- Safety Barrier: Flame-retardant interlayer that prevents thermal runaway spread between failed cells.
- Portable Energy Storage: Encapsulates soft-pack cells in power banks/solar generators, providing light protection and fire safety.
Directions for Use
- Pre-potting Preparation: Calibrate scales, prepare potting tools, cleaning tools, check machine settings, check vacuum pump force, etc.
- Product Pre-treatment: Place product on a level surface or fixture. Remove dust, clean, degrease, and dry if necessary.
- Accurate Proportioning: Manual operation requires precise mixing according to the specified ratio and recording. Machine potting requires calibrated ratios and first-article confirmation is recommended.
- Mixing & Stirring: Manual operation requires thorough stirring or using electric stirrers to ensure homogeneous mixing. Machine potting requires sufficient stirring speed, adjust as needed.
- Uniform Potting: Manual operation should be done in small, multiple batches to ensure uniformity. Machine potting should follow the programmed path for quantitative dispensing.
- Inspection or Secondary Potting: After potting, visually inspect as needed. Perform touch-up, bubble removal, or secondary potting if required.
- Curing: Allow the potted and inspected products to cure at room temperature or with heat assistance (recommended 60°C if needed), according to product and process requirements.
- Final Product Confirmation: Perform visual inspection and performance testing as required by the customer.
Packing
- Hardener: Typically 5KG/10KG/25KG/200KG metal or plastic drums.
- Resin: Typically 25KG/200KG metal or plastic drums.
