New Energy High-Voltage Circuit Protection: Technological Innovation for Ceramic Tube for EV BS Series

As the photovoltaic industry chain evolves toward higher efficiency and larger scale, the application scenarios for fuses are becoming increasingly diverse. For string inverters in distributed photovoltaic power stations, fuses with low current ratings are typically employed; conversely, centralized systems in large-scale ground-mounted power stations require high-power products capable of handling currents of 80A or even higher. This trend has driven the continuous iteration of ceramic body technology for EV fuses, demanding that these components possess superior mechanical strength and thermal shock resistance while simultaneously maintaining a lightweight profile. In terms of material selection, 95% alumina ceramic has emerged as the preferred material for the bodies of electric vehicle auxiliary fuses, thanks to its exceptional electrical insulation properties, high hardness, and high-temperature resistance; this material effectively enables reliable operation across a wide temperature range of -40°C to 85°C.

In the electric vehicle sector, the widespread adoption of 800V high-voltage platforms has imposed even more stringent requirements on fuses. Onboard fuses must not only be capable of interrupting short-circuit currents reaching thousands of amperes within an extremely short timeframe but also withstand the severe vibrations and mechanical shocks encountered during vehicle operation. Consequently, the design and manufacturing of ceramic bodies for EV fuses demand extreme precision. These ceramic components for DC automotive fuses are typically fabricated using high-purity steatite or alumina ceramics; through advanced isostatic pressing and high-temperature sintering processes, uniform wall thickness and the absence of micro-cracks are ensured, thereby guaranteeing structural integrity even under extreme short-circuit fault conditions.

To accommodate the various high-voltage circuits within electric vehicles, the form factors of insulating electrical steatite ceramic fuse bodies exhibit considerable diversity. For instance, in the main circuit protection of battery packs, bolt-connected high-voltage fuses are commonly utilized, necessitating that the alumina ceramic components for these bolted-connection EV fuses possess exceptionally high flexural strength and sealing capabilities. Conversely, in auxiliary circuits or On-Board Chargers (OBCs), the focus for ceramic bodies in electric vehicle auxiliary fuses shifts toward a combination of miniaturization and high reliability, ensuring precise overload and short-circuit protection within compact spatial constraints.

Beyond purely electric vehicles, hybrid electric vehicles (HEVs) also rely heavily on the protection afforded by high-performance fuses. Ceramic components designed for electric and hybrid vehicle fuses must maintain stable electrical performance amidst complex electromagnetic environments and frequent charge-discharge cycles. High-quality ceramic casings for fuse links effectively isolate the high-temperature metal vapors generated when the internal fuse element melts, preventing secondary contamination or short circuits in external circuitry and safeguarding the high-voltage safety of new energy vehicles.

In infrastructure such as DC charging stations, the reliability of fuse links is directly linked to charging safety. Ceramic tubes for EV charger fuse links typically require exceptional weather resistance and anti-aging properties to withstand complex and variable outdoor climatic conditions. During the manufacturing process, these ceramic tubes undergo rigorous thermal shock testing and airtightness inspections to ensure that no insulation failures or air leaks occur during long-term operation, thereby guaranteeing the absolute safety of the charging process.

To meet the diverse standard requirements of different countries and regions, the design of ceramic tubes for high-voltage fuses must be appropriately adapted. For instance, fuse links compliant with the British Standard (BS) system are subject to specific specifications regarding their dimensions and structure. The production of ceramic tubes for EV British Standard fuses and the EV BS series demands that manufacturers possess extremely high precision in mold development and process control capabilities, ensuring that the products integrate seamlessly into various high-voltage power distribution systems compliant with British Standards.

In the industrial and low-voltage power distribution sectors, ceramic tubes for EV DC fuses also play an indispensable role. Products such as ceramic bodies for Siemens LV HRC fuses-distinguished by their standardized dimensions and superior electrical insulation properties-are widely utilized in various industrial control cabinets and power distribution systems. These casings serve not only as physical barriers but also function as the walls of the arc-extinguishing chamber when the fuse operates; working in conjunction with the internal arc-extinguishing medium, they rapidly elongate and cool the electric arc, thereby ensuring the safe interruption of fault currents.