As a fundamental core component of circuit control systems, the primary function of a relay is to switch (connect, disconnect, or divert) electrical circuits. Simultaneously, relays serve to expand control ranges, amplify signal sensitivity, and facilitate remote control and monitoring capabilities; consequently, they are widely utilized across diverse industrial sectors, including military equipment, telecommunications, computing, and automotive manufacturing. High-voltage relays for electric vehicles-serving as critical control components within the new energy vehicle sector-have a market trajectory closely intertwined with that of their supporting contact and welding products. In this context, the Brazed Contact on Terminal has emerged as a core supporting component for high-voltage relays, distinguished by its stable and reliable connection performance.
Automotive relays are specialized relays specifically designed to interface with and control automotive electrical systems, evolving and upgrading in tandem with advancements in automotive electronics and electrical products. In traditional internal combustion engine vehicles, relays are extensively deployed across various systems-including starters, air conditioning, lighting, windshield wipers, and electronic fuel injection units. These applications typically involve low-voltage products, with operating voltages concentrated within the 12–48V range; consequently, the performance requirements for their electrical contacts are relatively moderate. The "Welding Button Contact" is well-suited to meet the fundamental conductivity requirements of these traditional, low-voltage automotive relays.
Unlike traditional vehicles, new energy vehicles (NEVs) typically feature main circuit voltages exceeding 200V-far higher than the low-voltage standards of conventional automobiles. Consequently, in addition to standard low-voltage relays, these vehicles require specialized high-voltage DC relays. Compared to traditional vehicles, NEVs utilize a significantly larger number of relays; moreover, the intricate interplay between internal power currents and signal currents imposes stringent demands on the reliability and electrical performance of high-voltage relays. Thanks to their exceptional resistance to high voltage and arc erosion, Composite Weld Contacts are ideally suited to meet the operational requirements of these high-voltage relays.
Driven by the rapid expansion of the NEV industry, the domestic market for high-voltage relays in electric vehicles is poised for substantial growth. Concurrently, the increase in charging power-coupled with the widespread adoption of 4C fast charging-is pushing the current levels in 800V electrical systems close to their operational limits. This trend places even higher demands on the core performance metrics of high-voltage DC relays, particularly regarding voltage withstand capability, current-carrying capacity, and arc-extinguishing efficiency. Through precision welding techniques, Welded Silver Contact technology ensures the connection reliability of high-voltage relay contacts, thereby meeting the rigorous demands of high-stress operating conditions.
In terms of market scale, industry data indicates that the Chinese market for high-voltage relays in NEVs is projected to reach 5.202 billion RMB by 2025. Given the steady growth trajectory of the NEV sector, the domestic market for high-voltage relays in electric vehicles is expected to climb to 7.332 billion RMB by 2027, demonstrating significant growth potential. As Welded Silver Contacts serve as a critical contact component within high-voltage relays, market demand for them is expected to grow in tandem with this overall market expansion.
Regarding the competitive landscape, the high-end segment of the NEV high-voltage DC relay market is currently dominated by major domestic and international industry giants, creating a relatively oligopolistic market structure. These leading enterprises possess distinct competitive advantages in terms of brand reputation and product quality; furthermore, their high-voltage relay products consistently incorporate high-quality contact components. With their superior electrical conductivity and surface flatness, Electrical Contact Sheets have emerged as the preferred contact material for high-end high-voltage relays.
The performance of a high-voltage relay fundamentally relies on the quality of its accompanying contact components and the precision of its welding process. Radius Face Brazed Composite Rivet Contacts feature a specialized structural design that delivers exceptional contact stability and wear resistance; they are capable of effectively withstanding the transient shocks associated with high-voltage and high-current operating conditions, thereby extending the service life of the high-voltage relay.
In the manufacturing of high-voltage relays, the precision of the welding process directly dictates product reliability. Resistance Brazing Silver Contact technology-distinguished by its precise temperature control and consistent bonding results-effectively mitigates issues inherent in traditional welding methods, such as thermal damage and solder splatter. This ensures a robust connection between the contacts and terminals, thereby guaranteeing the stable electrical performance of the high-voltage relay.
Overall, the domestic market for high-voltage relays in electric vehicles is projected to maintain steady and rapid growth from 2025 to 2028, characterized by a distinct trend toward localization and domestic substitution. As core components of high-voltage relays, brazed electrical contacts and welding processes directly determine a product's performance and reliability. Selecting the appropriate contact products and welding techniques is therefore of paramount importance in driving the industrial upgrading of the high-voltage relay sector and meeting the high-voltage control requirements of electric vehicles.
If you require further technical consultation or assistance with procurement regarding electrical contact welding, we invite you to contact us to receive professional, comprehensive industry support and customized solutions.
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