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HCET provides reliable comprehensive solutions for overheating and overcurrent protection.
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HCET provides reliable comprehensive solutions for overheating and overcurrent protection.
With the popularization of new energy vehicles, the safety of charging and discharging plugs, as the core component of power transmission, has attracted much attention. How to realize fast and accurate temperature protection under extreme working conditions such as high temperature and overload? Bimetallic temperature control switches have become one of the key technologies in this field by virtue of their unique physical characteristics.
I. Application scenario: from passive protection to active control
Charging and discharging plugs are susceptible to localized overheating due to current overload, poor heat dissipation, or high ambient temperatures, which can shorten the life of the equipment or lead to fire. Bimetallic temperature control switches work through the following scenarios:
- Overload protection: When the temperature of the charging pile or vehicle charger rises suddenly due to abnormal current (e.g. short-circuit, battery overcharging), the switch quickly cuts off the circuit to avoid melting of the cables.
- Environmental adaptability: In summer high temperatures or closed charging compartments, the switch monitors the internal temperature of the plug in real time to prevent malfunctions caused by the accumulation of ambient heat.
- Equipment synergistic protection: linkage with BMS (Battery Management System), fuses, etc., forming a multi-level protection network to enhance system reliability.
II. The protection mechanism: efficient utilization of physical characteristics
The core of the bimetal temperature control switch lies in its thermal deformation characteristics: laminated from two metals with different expansion coefficients, when the temperature reaches the preset threshold (e.g. 85℃~105℃), the bimetal sheet is bent by heat, pushing the mechanical contacts to separate and forcing the power to be cut off. Its technical advantages are reflected in three aspects:
- Instantaneous response: no need for electronic signal conversion, physical deformation directly triggered action, response speed of milliseconds, far more than the traditional electronic temperature control devices.
- Automatic reset: the bimetal plate is restored to its original state after the temperature returns to the original state, the circuit is automatically on, reducing the cost of artificial maintenance.
- Strong adaptability: different deformation temperatures (60℃~150℃) can be customized to fit different power scenarios such as fast charging pile and slow charging gun.
III. The value of technology: low cost and high reliability coexist
In the context of new energy vehicles pursuing cost reduction and efficiency, bimetal temperature control switches show unique competitiveness:
- Passive design: no need for external power supply or complex circuits, simple structure and low failure rate, life expectancy up to 100,000 times or more.
- Anti-interference: vibration-resistant, dustproof and waterproof, adapting to the harsh environment of the vehicle.
- Economy: The cost is only 1/3~1/2 of the electronic temperature control program, which helps automotive companies to control supply chain costs.
Conclusion
Bimetallic temperature control switch with “physical mechanism + accurate temperature control” as the core, for new energy vehicles charging and discharging plug to build a highly efficient safety line of defense. In the future, with the upgrading of material technology, its temperature accuracy and durability are expected to be further improved, and it will become an indispensable basic component in the new energy industry. The wide application of this technology not only reflects the innovative value of traditional physical devices, but also highlights the pragmatism and wisdom of new energy vehicle safety design.
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