The ongoing development and ever greater acceptance of new drives which use electricity or hydrogen poses new challenges for automobile manufacturers. Suppliers and service providers who support established automobile manufacturers with their know-how are a crucial success factor for dealing with electromobility. Bertrandt AG provides its customers with test stands with climatic chambers to test high-voltage batteries from the module level and hybrid batteries to batteries for all-electric vehicles under various climatic and load conditions. The components are exposed to a wide variety of conditions in climate simulations or accelerated aging in fatigue tests. Bertrandt has successfully offered these industry-specific development services for over 40 years and is a globally operating company with around 13,000 employees and 57 locations. This year the company built one of the largest high-voltage battery test centers in Germany in Ehningen. Bertrandt has put its faith in temperature control technology from LAUDA to equip the new test chambers.
High-precision
temperature control down to -40 °C
In addition, the
company has ordered Process Cooling Units with volume flow control from LAUDA
which meet the high demands of customers in the automotive sector. The units
are used to control the temperature of test specimens inside a climatic
chamber, such as HV storage devices, i.e. high-voltage batteries, which are
used in electric cars as well as solar systems. The customer uses two large SUK
400W units for performance tests and ten additional SUK 350W units for
endurance tests and simulation runs. The Process Cooling Units precisely
control the temperature from -40 to 120 °C.
The special feature: LAUDA develops the refrigeration systems with a water/glycol mixture as the temperature control medium and a single-stage schema cooling circuit. By dispensing with a cascade refrigeration system, LAUDA can guarantee the future-proofing of the design with regard to the European F-Gas Regulation, since a refrigerant with a high GWP value is not required for the second stage. The refrigeration system must have sufficient power reserves, in order to be able to guarantee precise control even at limit temperatures around -40 °C. Each individual Process Cooling Unit must be precisely tailored, since water/glycol mixtures begin to freeze at temperatures around -45 °C (depending on the concentration).
“LAUDA develops the refrigeration systems with a water/glycol mixture as the temperature control medium and a single-stage schema cooling circuit”
Fully
automatic filling facilitates test processes
LAUDA has equipped the
Process Cooling Units with fully automatic filling and draining of the test
specimen, in order to facilitate the testing processes of the customer in the
automotive sector. This technology, which has been in LAUDA’s product range for
a long time, is now being requested by more and more customers and is becoming
the industry standard, explains Manuel Faulhaber, Project Manager at LAUDA
Heating and Cooling Systems. Since Bertrandt is a service provider which serves
a wide variety of customers, the systems have also been designed with fully
automatic filling and draining of the entire system. Bertrandt is therefore
able to use a wide range of customer-specific temperature control media for its
test procedures without cumbersome manual filling and draining – a massive time
saving for the service provider.