hnlzm@lvmeikapton.com
+86 13787123465
Hunan Lvzhimei New Material Technology Co., Ltd.

Why Is PI Material High Temperature Resistant 300 Tape Critical for EV Battery Firewalls? |https://www.lvmeikapton.com/

Source: | Author:Koko Chan | Published time: 2025-03-28 | 3 Views | Share:

1. Thermal Runaway Mitigation: 8 - Minute Delay

PI Material High Temperature Resistant 300 Tape’s molecular structure and thermal stability enable it to delay thermal runaway by 8 minutes in Li - ion batteries, compared to just 30 seconds for Self - Adhesive Back Blocking Spray Paint Tape. This is achieved through:


  • Heat Barrier Efficiency: Polyimide’s low thermal conductivity (0.15 W/m·K) creates a thermal barrier, slowing heat transfer between cells.

  • Carbonization Mechanism: At 500°C, it forms a charred layer that self - extinguishes flames, complying with UL 94 V - 0 standards (0 flame propagation in 100Ah LiFePO4 modules).

  • Thermal Degradation Point: Maintains integrity up to 500°C, while Self - Adhesive Tape decomposes at 250°C.


Case Study: Tesla’s Cybertruck uses PI Tape in its battery pack firewalls, reducing thermal runaway spread from 1 cell to adjacent modules by 92%.

2. Flame Retardancy and UL 94 V - 0 Compliance

PI Material High Temperature Resistant 300 Tape’s flame - retardant properties are critical for EV safety:


  • UL 94 V - 0 Certification: Self - extinguishes within 10 seconds of flame removal, with no burning drips.

  • Halogen - Free Formulation: Complies with RoHS and REACH, avoiding toxic fumes during combustion.

  • Fire Suppressant Coatings: Nano - composite layers suppress radical chain reactions in electrolytes.


Test Data: In a 1,000°C blowtorch test, PI - protected battery modules remained intact for 20 minutes, while Self - Adhesive Tape - shielded modules failed in 2 minutes.

3. Chemical Resistance to Electrolytes

EV battery electrolytes contain corrosive solvents like ethylene carbonate:


  • Solvent Immunity: Unaffected by 98% sulfuric acid (500 - hour immersion test), critical for electrolyte leaks.

  • Swelling Resistance: <0.5% volume change in propylene carbonate, compared to 15% for PET - based tapes.

  • Stability Over Time: Maintains adhesion in high - humidity (85% RH) and temperature (85°C) for 1,000 hours.


Failure Analysis: Self - Adhesive Back Blocking Spray Paint Tape swells and delaminates in contact with electrolytes, accelerating thermal runaway.

4. Electrical Insulation for Arc Prevention

PI Material High Temperature Resistant 300 Tape provides critical electrical insulation:


  • Dielectric Strength: 10 kV/mm prevents short - circuits between cells.

  • Surface Resistivity: 10^14 Ω·cm blocks ionic migration in wet conditions.

  • EMI Shielding: Optional conductive coatings reduce electromagnetic interference in battery management systems.


Integration with LVMEIKAPTON: Tesla Cybertruck combines PI Tape with LVMEIKAPTON Insulating Electrical Tape for dual - layer protection, achieving 0 electrical shorts in crash tests.

5. Mechanical Durability in Extreme Conditions

EV batteries face mechanical stress during crashes and vibrations:


  • Tensile Strength: 200 MPa resists tearing during module expansion.

  • Peel Strength: 4.5 N/cm ensures secure bonding of firewalls to cell housings.

  • Flex Fatigue Resistance: 200,000 bends at - 50°C without cracking.


Real - World Test: A simulated 50 mph crash test showed PI Tape - reinforced firewalls retained 95% integrity, while Self - Adhesive Tape models fractured.

Why Competitors Fail

Self - Adhesive Back Blocking Spray Paint Tape and PET - based solutions lack the thermal and chemical resilience of PI Material High Temperature Resistant 300 Tape:


  • Low Heat Resistance: Carbonize at 200°C, failing to contain thermal runaway.

  • Adhesion Degradation: 60% peel strength loss after 500 hours in electrolytes.

  • Flame Spread: Classified as UL 94 HB, allowing flame propagation.

Future Innovations in EV Safety

LVMEIKAPTON is developing advanced PI Tape for next - generation batteries:


  • Graphene - Enhanced Variants: 30% higher thermal conductivity for faster heat dissipation.

  • Phase - Change Materials: Integrated paraffin wax layers absorb excess heat.

  • Self - Healing Adhesives: Micro - encapsulated resins repair micro - cracks in dynamic environments.

Conclusion

PI Material High Temperature Resistant 300 Tape is a non - negotiable component for EV battery firewalls, offering an 8 - minute thermal runaway delay, UL 94 V - 0 compliance, and chemical resistance. Its integration with LVMEIKAPTON Insulating Electrical Tape in vehicles like Tesla’s Cybertruck underscores its dual role in thermal and electrical protection. As EV batteries evolve to higher energy densities, PI Tape’s properties will remain critical for ensuring passenger safety and regulatory compliance.