Views: 0 Author: Site Editor Publish Time: 2025-05-26 Origin: Site
The 3240 epoxy resin sheet is a high-performance fiberglass laminate renowned for its outstanding combination of electrical insulation, mechanical robustness, and thermal stability. Widely adopted in lithium battery packs, this material also excels across multiple industries—including electronics, aerospace, and heavy machinery—where reliable, lightweight insulation is paramount.
The 3240 sheet is produced by impregnating alkali-free E-glass fabric with a proprietary blend of epoxy and phenolic resins. Under controlled heat and pressure, this composite cures into a dense, void-free laminate. The cross-linked polymer network ensures minimal dimensional change (shrinkage below 2%), delivering tight tolerances and consistent performance across production batches.
High Dielectric Strength: Withstand electric fields up to 25 kV/mm, effectively preventing arcing and short-circuits.
Superior Resistivity: Volume and surface resistivity exceed 10⊃1;⁴ Ω·cm and 10⊃1;⊃3; Ω, minimizing leakage currents.
Low Dissipation Factor: Often below 0.02 at 1 MHz, ensuring minimal dielectric losses in high-frequency applications.
Tensile Strength: 300–400 MPa, enabling reliable structural support.
Flexural Strength: 400–500 MPa, resisting bending and deformation.
Compressive Strength: 350–450 MPa, bearing heavy loads without crushing.
Impact Resistance: Robust against sudden shocks and vibration.
Thermal Class B (130–155 °C): Ideal for high-temperature operation.
Low Coefficient of Thermal Expansion: Reduces mechanical stress during temperature swings.
Moisture Stability: Preserves dielectric and mechanical properties after prolonged humidity exposure.
Chemical Resistance: Unaffected by oils, acids, alkalis, and common solvents.
While the 3240 epoxy resin sheet is integral to battery module insulation, its versatility extends to:
Printed Circuit Boards (PCBs) and Switchgear: As structural substrates and insulating barriers in power distribution equipment.
Aerospace Components: Interior panels, reinforcement layers, and radomes where weight savings and fatigue resistance are critical.
Automotive Electronics: Inverters, sensor housings, and EV power electronics that face vibration, heat cycling, and chemical exposure.
Industrial Machinery: Wear-resistant linings, conveyor parts, and pump housings in corrosive or abrasive environments.
Designers choose from a range of specialization materials to meet specific battery requirements:
Mica Foils: Natural mineral sheets offering ultra-high heat tolerance (up to 1,000 °C) for thermal runaway barriers.
Polyimide Films (e.g., Kapton®): Thin, flexible films with excellent dielectric strength and heat stability for cell wraps.
Polyester (PET) and Polypropylene (PP): Widely used separators and cell liners providing good insulation and dimensional control.
Silicone Sheets: Soft, conformable pads with broad operating temperatures for gap filling and thermal interface management.
Ceramic-Based Layers: Rigid barriers with superior thermal conductivity and flame resistance.
Aerogel Blankets: Ultra-lightweight panels with extremely low thermal conductivity for high-end thermal regulation.
Phase-Change Materials (PCMs): Embedded in composite liners to absorb and dissipate heat spikes during rapid charging/discharging.
The 3240 epoxy resin sheet stands out as a cornerstone insulation material for lithium battery packs, combining electrical safety, mechanical integrity, and thermal resilience in one versatile laminate. Its proven track record in electronics, aerospace, automotive, and industrial applications underscores its adaptability. Meanwhile, engineers also leverage complementary materials—ranging from mica and polyimide to aerogels and PCMs—to fine-tune thermal management and safety in next-generation battery systems. Selecting the optimal insulation solution requires balancing dielectric requirements, temperature profiles, mechanical demands, and cost considerations to ensure reliable, long-lasting performance.
