Oil cooling lines for eMobility

Weight-reduced oil hose lines for tempering batteries.
ContiTech is developing solutions that increase the efficiency, and thus the range and durability, of the batteries in electric vehicles. The latest development are hoselines for a customer for battery tempering using oil instead of the more common cooling water (water-glycol mixture). 

The batteries in electric vehicles work at their most efficient at temperatures between 10 and 30 °C. This temperature spectrum enables long ranges, extends battery life and allows the batteries to work more efficiently. For that reason, the batteries have to be either cooled or heated, depending on the outside temperature. Some manufacturers are now increasingly relying on oil as the relevant medium or are immersing batteries directly in the oil. The manufacturers expect a significant extension in range for their e-vehicles if an oil bath is used.

Oil cooling lines for eMobility

Up till now, tempering has largely been achieved by means of cooling water. Classic heating and cooling lines have carried the relevant media. However, this system also brings risks with it: In the event of a leak, the battery could come into contact with the water which, in the worst-case scenario, could cause a short-circuit, resulting in total failure of the battery. Costly precautions still have to be taken to exclude this risk.


  • A new connector minimizes pressure losses in this process
  • The weight of the new hose generation has also been reduced.
  • Smaller line cross-sections on the high-pressure side and in the battery cooling line help to ensure that as little refrigerant as possible has to be used.
  • The right mixture of rubber, plastic and aluminum materials and an ingenious line geometry ensure the system has adequate inherent stability.