How Does EV Fuse Ceramic Body Solve Fast-Charge Overheating

According to Sina Auto, China had over 120,000 480kW+ ultra-fast charging piles in H1 2025. 800V EVs made up 38% of new car sales. Fast charging brings overheating risks to fuses. An EV fuse ceramic body is a key part to fix this problem. This article talks about its heat-solving rules, material performance, structural design, application scenarios and Xiamen APOLLO's solutions.

 

 

1. Efficient Heat Conduction Mechanism​

The ceramic body for EV fuses has a thermal conductivity of 1.8-2.2 W/(m·K). It's 3 times higher than plastic casings. It quickly moves heat from the fuse link to the outside. This stops local overheating during 480kW fast charging.​

 

2. Arc Quenching and Heat Absorption​

A ceramic body for ev fuse can stand 1200℃ high temperatures. When fast charging causes current surges, it absorbs arc heat right away. It quenches arcs in 0.02 seconds. This stops heat from piling up and damaging components.​

 

3. Insulation and Heat Isolation​

The ceramic body has a volume resistivity over 10¹⁴ Ω·cm. It separates high-temperature fuse links from nearby parts. This stops heat from moving to battery packs or charging modules during fast charging.

 

 

1. High-temperature stability: A ceramic tube for high voltage fuse uses 95% purity steatite ceramic. Even when fast-charge current hits 1500A and surface temperature reaches 600℃, it won't soften or deform.​

 

2. Low thermal expansion: The ceramic body's thermal expansion coefficient is ≤5×10⁻⁶/℃. This avoids cracks from quick temperature changes (from 25℃ to 500℃ in 10 seconds) during fast charging.​

 

3. Corrosion resistance: The ceramic surface has an anti-oxidation coating. It resists damage from battery electrolytes and charging station humidity. This keeps its heat dissipation performance good for a long time.

 

 

1.  Multi-Channel Heat Dissipation Grooves​

Add 4-6 axial grooves on the outer wall of a ceramic casing for fuse link. The grooves increase heat dissipation area by 40%. This speeds up heat release during 30-minute fast charging (0-80% SOC).​

 

2.  Hollow Cavity Heat Buffer​

Design a 2mm-thick hollow cavity inside the ceramic body. The cavity acts as a heat buffer. It slows down heat transfer to the casing surface by 25%. This protects nearby temperature-sensitive components.​

 

3.  Sealed Heat-Resistant Gasket​

Use silicone gaskets at the ceramic body's ports. These gaskets can stand 300℃ high temperatures. They stop dust and moisture from blocking heat dissipation channels. They also bear high temperatures from fast charging.

 

 

An EV fuse ceramic body is widely used in fast-charge-related systems. In 800V EV battery packs, it solves overheating during 10-minute ultra-fast charging (5C rate). In 480kW DC charging piles, a ceramic tube for EV DC fuse handles 1200A peak current without overheating. In commercial EV charging stations (with 10+ piles), it keeps heat dissipation stable even during 8-hour continuous fast charging. These scenarios fully prove its ability to solve fast-charge overheating.

 

 

Xiamen APOLLO's ceramic body for EV fuses uses 96% high-purity steatite ceramic. It's higher than the 95% purity commonly used in the industry. This improves heat conductivity by 8%. It keeps heat dissipation stable during fast charging. Our ceramic body for ev fuse goes through 4-step quality checks (density, thermal conductivity, high-temperature resistance, insulation). It's stricter than the industry's 3-step checks. It meets IATF 16949 and UL standards.​

 

We offer flexible custom services. We adjust the length (10-30mm) and inner diameter (5-15mm) of ceramic tube for high voltage fuse. We do this according to customers' fast-charge fuse models. It fits 400V/800V platforms. Our global sea-land-air logistics works well. It delivers to European ports in 18-25 days, North American ports in 15-22 days, and Southeast Asian countries in 5-10 days. Our after-sales team gives technical guidance within 24 hours. It helps customers solve fast-charge heat dissipation matching issues quickly.