FR4 Fiberglass Board for New Energy Vehicle Battery Insulation Applications & Performance Analysis
As the core component of the entire vehicle, the safety and reliability of new energy vehicle power battery packs are directly related to the lives of drivers and passengers. FR4 fiberglass boards, with their excellent electrical insulation properties, mechanical strength and high temperature resistance, have become the preferred material for key components such as battery module insulation brackets, battery cover insulation layers, and busbar insulation supports. This article will deeply analyze the application scenarios and technical requirements of FR4 fiberglass boards in new energy battery packs.
Technical Requirements for New Energy Vehicle Battery Pack Insulation
The working environment of power battery packs is complex, and insulation materials need to meet multiple stringent requirements:
Electrical Performance Requirements
- Insulation Resistance: Normal condition ≥1000MΩ·km, after 24h water immersion ≥10MΩ·km
- Dielectric Strength: Withstand power frequency withstand voltage test (2Un+1000V,持续1min) without breakdown
- Comparative Tracking Index (CTI): ≥175V, meeting PLC2 grade, ensuring creepage distance requirements in humid environments
Mechanical Performance Requirements
- Tensile Strength: ≥300MPa, withstanding battery module expansion stress
- Flexural Strength: ≥350MPa, providing support as structural component
- Impact Strength: ≥150kJ/m², resisting collision impact
Environmental Adaptability Requirements
- Operating Temperature: -40°C ~ +125°C, covering severe cold and high heat conditions
- Flame Retardant Grade: UL94 V-0, self-extinguishing time ≤10 seconds
- Chemical Resistance: Withstanding corrosion from electrolyte, coolant
Core Advantages of FR4 Fiberglass Board
FR4 is a composite material with epoxy resin as the matrix and fiberglass cloth as the reinforcement material. It has the following advantages in battery pack insulation applications:
| Performance Parameter | FR4 Typical Value | PC Board | PP Board | Advantage Description |
|---|---|---|---|---|
| Insulation Resistance | ≥10¹⁴Ω·cm | ≥10¹⁴Ω·cm | ≥10¹⁴Ω·cm | Same insulation level |
| Flexural Strength | 350-450MPa | 80-100MPa | 40-60MPa | FR4 is 3-8 times higher |
| Temperature Range | -40~+130°C | -40~+115°C | -20~+100°C | FR4 wider temp range |
| Flame Retardant Grade | UL94 V-0 | UL94 V-2/HB | HB | FR4 optimal flame retardancy |
| Dimensional Stability | Excellent | Medium | Poor | FR4 low thermal expansion coefficient |
| Cost | Medium | Relatively high | Lower | FR4 best cost performance |
The high mechanical strength of FR4 fiberglass boards allows them to be used as structural support components, not just insulation layers. This feature is particularly important in battery module design, as it can reduce the number of parts, simplify assembly process, and lower system costs.
Typical Application Scenarios in Battery Packs
1. Battery Module Insulation Bracket
Function: Support cells, isolate cells from metal casing, provide creepage distance
FR4 Specification: Thickness 1.5-3.0mm, Tg≥130°C (high Tg type Tg≥170°C)
Processing Requirements: CNC precision cutting, tolerance ±0.1mm, no burrs on edges
2. Busbar Insulation Support
Function: Fix busbars, isolate high-voltage conductive parts, withstand thermal effects of high current
FR4 Specification: Thickness 2.0-4.0mm, tracking resistance CTI≥175V
Design Key Points: Hole positions avoid high stress areas, rib design to enhance rigidity
3. Battery Cover Insulation Layer
Function: Isolate battery module from cover metal, protect against high-voltage electric shock
FR4 Specification: Thickness 0.5-1.5mm, copper foil optional (for electromagnetic shielding)
Safety Requirements: Pass needle puncture test, crush test without short circuit
4. BMS Circuit Board Substrate
Function: Battery Management System PCB substrate, carrying control circuits
FR4 Specification: Thickness 1.0-2.0mm, copper foil thickness 35-70μm
Reliability: High Tg type FR4, Tg≥170°C,适应 high temperature conditions
Selection and Procurement Guide
Material Grade Selection
- Standard FR4: Tg 130-140°C, suitable for general conditions (battery temperature ≤60°C)
- High Tg FR4: Tg 170-180°C, suitable for high temperature conditions (battery temperature ≤80°C)
- Halogen-free FR4: For environmental protection requirements, no toxic gas released during combustion
Thickness Selection
- Insulation isolation: 0.5-1.5mm (economical type)
- Structural support: 2.0-3.0mm (standard type)
- Load-bearing components: 4.0-6.0mm (reinforced type)
Processing Capability Requirements
Battery pack parts are usually custom-shaped, suppliers need to have the following processing capabilities:
- CNC precision cutting: tolerance ±0.05-0.1mm
- Laser cutting: complex contour rapid processing
- Drilling and tapping: mounting hole processing
- Surface treatment: solder resist ink, character printing
Dongguan Chaorong Electronics Co., Ltd. Service Capabilities
Dongguan Chaorong Electronics Co., Ltd. has focused on FR4 fiberglass board processing for 15 years, providing one-stop solutions for new energy vehicle customers:
- Material Supply Chain: Strategic cooperation with first-line sheet manufacturers such as KB, Shengyi, ensuring stable material quality
- Precision Processing: Equipped with multiple high-speed CNC machining centers, processing accuracy ±0.05mm, daily capacity 5000+ pieces
- Custom Development: Support custom drawing, small batch sampling, rapid response (sample 3 days delivery)
- Quality System: IATF 16949 automotive quality system certification, each batch of products accompanied by test report
- Cost Advantage: Large-scale procurement + lean production, strong price competitiveness
Conclusion
FR4 fiberglass boards, with their excellent electrical insulation properties, high mechanical strength, good flame retardancy and wide temperature adaptability, have become the ideal choice for new energy vehicle battery pack insulation materials. Reasonable selection of FR4 grade and thickness, combined with professional precision processing, can ensure safe and reliable operation of battery packs. Dongguan Chaorong Electronics Co., Ltd. is willing to provide high-quality FR4 parts and professional technical support for new energy battery manufacturers.
Keywords: FR4 fiberglass board, new energy vehicle battery pack insulation, battery module insulation bracket, FR4 electrical insulation properties, battery pack insulation material selection, Dongguan Chaorong Electronics Co., Ltd.