Technical architecture and application analysis of Fuse contact knife cap for new energy vehicles
Apr 22, 2026
Core role: The safety cornerstone of high-voltage electrical connections
In the high-voltage power supply system of new energy vehicles, the Fuse contact knife cap in the fuse assembly is the core connecting component of the power battery pack top cover, responsible for the safe electrical connection between the battery unit and the external circuit. This contact point is not only a bridge for efficient collaboration between battery management systems and vehicle controllers, but its performance is also directly related to the stability of power transmission and operational safety of the entire vehicle. By effectively cooperating with the contact components of the car fuse, End cap and contact help achieve continuous and stable operation of the high-voltage power system.
structural design
The Fuse contact knife cap is made of high-purity copper material. Through precision cutting and structural optimization design, the contact area for current transmission is expanded, effectively reducing voltage drop and heat loss under high current conditions. It can adapt to the fast charging needs of new energy vehicles on the 800V high-voltage platform.
In terms of sealing, the cover adopts a cylindrical or square cylinder structure, which is precisely matched with the fuse ceramic tube. Combined with strengthened sealing technology, it can effectively isolate pollutants such as moisture and dust, and prevent battery electrolyte leakage.
In addition, the connection layer achieves a firm connection between Welding joints for fuse and the cover body through brazing or spot welding processes, supplemented by structural locking components, significantly improving the anti vibration performance, avoiding poor contact or loosening caused by high-frequency vehicle vibration, and ensuring long-term stable operation of the high-voltage system.
Application scenarios
In the power battery pack, the End cap and contact welding components serve as the last line of defense for short circuit protection of the main circuit, stably connecting the battery to the external circuit to ensure safe power transmission and reduce the risk of short circuit.
In the DC fast charging port, especially in the 800V high-voltage fast charging scenario, the End cap and terminal can withstand instantaneous high current surges and provide reliable safety circuit breaking function, which helps to improve charging efficiency and safety.
In the motor controller, this module can effectively protect precision electronic components such as inverters from surge current damage, ensuring the efficient operation of the motor control system and achieving stable power output.
development trend
As the 800V high-voltage platform gradually becomes mainstream, Outer cap and contact are upgrading towards higher rated voltage, lower contact resistance, and stronger environmental adaptability. Some new designs are beginning to integrate temperature or current monitoring interfaces to enhance the real-time sensing capability of vehicle battery management systems. Meanwhile, lightweight and high integration have become important directions for future product optimization, driving the continuous evolution of Outer cap and terminal in terms of security and performance.
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