Electrical Battery Thermal Management (eBTM) complements Webasto’s product portfolio with a compact and scalable system that keeps drive batteries in trucks, vans, buses and construction machinery within the ideal temperature range at all times. This means that the batteries deliver their maximum power during operation regardless of the outside temperature and load, achieve the longest possible life cycle and can be charged more quickly.
Ideal temperatures for maximum performance
Precisely tailored to the requirements of traction batteries, eBTM allows continuous monitoring of the operating temperature and ensures a balance between the heating and cooling circuits to keep the temperature of traction batteries within the ideal range of approx. 22 degrees at all times. Depending on the vehicle type, application and number of batteries installed, several units can be combined. The eBTM dynamically adjusts the temperatures during different load phases. In addition, it can condition the batteries during the charging process and thus halve the charging time.
The system solution is designed for 400 as well as 800 volt applications and provides up to 8 kilowatts (kW) of cooling and up to 10 kW of heating power for battery systems with a total capacity of up to 210 kilowatt hours (kWh). Thanks to the compact dimensions of 100 x 70 x 30 (L x W x H) centimetres, a low weight of 90 kilograms and only a few connection interfaces, the plug & play system is easy to install and can be put into operation quickly. The components for the coolant and heating circuits, electric water pumps and control units are already included in the eBTM housing.
The advantages in figures
The eBTM from Webasto is highly efficient and thus saves important battery capacity in everyday use. The solution allows charging with up to 41 percent more power compared to batteries without thermal management. The accelerated power input results in a significantly shorter charging time. In a driving profile with high start and stop frequency, the thermal management provides 8.9 percent more range, which results, among other things, from the 24 percent higher recuperation power at low temperatures. In hot climatic conditions, the eBTM also improves the “State of Health” by 21 percent.
“The cornerstone of e-mobility is powerful traction batteries that hold the necessary energy for the e-drive and deliver it at the push of a button. In order for the batteries to develop their full performance and ensure that the vehicles and devices function properly, it is necessary to operate the batteries in the ideal temperature range regardless of the ambient temperatures and load. While batteries that are too cold lose power, excessive heat can cause chemical degradation of the battery cells, which can reduce their service life,” says Jörg Hornung, Vice President Business Line Thermal Management at Webasto. “With the eBTM, we deliver a sophisticated system solution for this challenge that harmonises optimally with our own, but also with traction batteries from other suppliers.”