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With the continuous evolution of new energy vehicle technology, the thermal management system (BTMS) of electric vehicle batteries has become increasingly complex and sophisticated, requiring efficient heat dissipation and stable operation in a limited space. In this key link, Seamless Tube, with its excellent structural integrity and material properties, is playing the role of "core transport channel" to support the efficient operation of the entire cooling system. Especially in the context of the increasingly modular and integrated modern battery cooling system, the "core application scenario" of seamless tubes has become the key fulcrum to drive the efficient operation of the entire thermal management system.
If the heat generated by the battery during operation is not discharged in time, it will lead to performance degradation and even thermal runaway. The core task of BTMS is to quickly export the heat of the battery cell and maintain its temperature in the ideal range (20–40°C) to improve the battery cycle life and vehicle safety. To achieve this goal, it is necessary to rely on a fluid channel that can withstand pressure, resist corrosion, accurately lay pipes, and conduct heat efficiently, which is exactly what seamless tubes are good at.
The integrally formed seamless tube has no welded joints, which can effectively avoid leakage points and stress concentration problems, ensuring stable operation in high-pressure cycles. In the face of corrosive coolants (such as ethylene glycol solutions), seamless copper tubes or stainless steel tubes show strong durability, extending the service life of the system and reducing the frequency of maintenance. The thermal conductivity of copper seamless tubes is as high as 390 W/m·K, which can quickly conduct heat, significantly improve the heat dissipation reaction speed, and optimize the battery temperature distribution. The internal space of the battery pack is extremely limited. The seamless tube can accurately customize the diameter, wall thickness and bending angle to achieve complex pipe routing solutions and modular integration requirements.
In modern electric vehicles, seamless tubes are widely embedded in multiple key thermal management structures. Its specific applications are as follows: Seamless tubes are used to connect the main passages between water pumps, heat exchangers and battery modules to maintain stable closed-loop operation of the system under high pressure and high flow rate conditions. Finely bent seamless copper tubes are directly embedded in the module or cold plate to provide local cooling for each battery cell, achieve uniform heat distribution, and avoid local overheating. It is used to connect the precise connection section of each module interface, temperature control valve and heat pump system, and bear the scene of frequent pressure fluctuations to ensure system response sensitivity and safety. In some cutting-edge designs, the battery cells are directly immersed in the coolant, and the seamless tubes are used to seal the coolant passages and maintain a stable flow rate, playing a central role in temperature control. The common requirements in these application scenarios are: high stability, high adaptability, and high reliability, which are the key to the precise satisfaction of seamless tubes. It can be said that behind the realization of efficient cooling in every place, seamless tubes silently undertake important thermal regulation tasks.
Today, the seamless tube industry chain is accelerating its transformation towards intelligence and environmental protection. The use of automated rolling and CNC bending technology can greatly improve dimensional consistency and batch customization capabilities; at the same time, the use of low-carbon stainless steel and renewable copper materials also helps the automotive industry chain achieve green and low-carbon goals. Leading car companies such as Weilai, Xiaopeng, Hyundai and other brands have widely adopted seamless tube components in their thermal management systems, and regard them as "technical accelerators" to improve the temperature control performance of the entire vehicle.
