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 rapid development of the global new energy vehicle industry, the power battery, as the “heart” of the electric vehicle, its safety, stability and service life have become the focus of industry attention. As the “guardian” of the battery, the Battery Management System (BMS) needs to monitor the battery status in real time and prevent risks such as thermal runaway. In this system, thermal switches have become one of the core components for battery safety due to their accurate temperature sensing ability and fast response mechanism.
The power battery pack of a new energy vehicle usually consists of hundreds or even thousands of cells, and during the charging and discharging process, the internal chemical reaction of the cells will generate heat. If the heat cannot be dissipated in time, it will lead to the following risks:
Thermal runaway: A sudden rise in local temperature may trigger a chain reaction, leading to a battery fire or explosion;
Performance degradation: high temperature will accelerate the decomposition of electrolyte, reducing battery capacity and cycle life;
Low-temperature failure: the internal resistance of the battery increases under extreme cold conditions, and the range decreases abruptly.
Therefore, the battery management system (BMS) needs to maintain the optimal working range of the battery at **20℃~40℃** through temperature monitoring, heat dissipation/heating control and other multiple means. As a combination of passive protection and active control, temperature control switch becomes an indispensable “safety guard” in BMS.
HCET Thermal Cutoff Switch (TCS) is an electronic component that triggers the circuit to turn on and off through temperature change. In the battery system of new energy vehicles, its workflow is as follows:
Temperature sensing: the built-in thermal element monitors the temperature of the battery cell or module in real time;
Threshold judgment: the switch is automatically triggered when the temperature exceeds the preset safety range (e.g. 60℃) or is below the low temperature threshold;
Circuit protection: prevent the battery from entering a dangerous state by cutting off the current or activating the cooling/heating system;
State recovery: automatic reset after the temperature returns to normal, ensuring continuous operation of the system.
When the battery temperature is abnormal due to fast charging, high load or high ambient temperature, the temperature control switch quickly cuts off the high voltage circuit to avoid thermal runaway; The linkage cooling system (e.g. liquid cooling pipeline, fan) is activated to accelerate the cooling. In a cold environment, the temperature control switch triggers the PTC heating device to raise the battery temperature to the working range to ensure the charging and discharging efficiency.In response to localized overheating of individual cells in the battery module, the temperature control switch can accurately locate and isolate the faulty unit to prevent the problem from spreading.The redundant safety design forms a “double insurance” with the active temperature control algorithm of the BMS, providing the last layer of physical protection when the electronic system fails.
As a manufacturer who has been deeply engaged in the field of temperature control for many years, our products have been specially optimized for the needs of new energy vehicles:
Patented bimetal structure: realizes millisecond response and improves impact resistance by 30%;
Ceramic sealing technology: isolates moisture and corrosive gases, suitable for complex vehicle environments;
Customization: supports different voltage (12V-800V), current specifications and temperature threshold settings;
Compliance with industry standards: ISO 26262 functional safety certification, AEC-Q200 automotive testing.
Under the industry consensus of “safety first” for new energy vehicles, temperature control switches, as the “invisible line of defense” of the battery thermal management system, are continuously promoting the upgrade of battery safety technology. We will continue to work hard on automotive-grade temperature control solutions, provide highly reliable and high-performance products for global new energy vehicle manufacturers, and work together to protect the future of green mobility.
If you have any questions about our products or services, please feel free to contact our customer service team at any time.
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