VDE pushes battery test center into operation
July 09, 2012 // Christoph Hammerschmidt
Battery safety is a big issue for electric vehicles. In the past few months, several accidents with casualties highlighted the risk associated to today's traction batteries. Now the German electrotechnical industry association VDE opened a battery test facility designed as a service provider for the automotive industry as well as for research institutes and government agencies.
The VDE Battery Test Center, located in Offenbach near Frankfurt, offers more than 50 test stands enabling engineers to put lithium-ion batteries through their paces. The test stands are dimensioned in a way that they also batteries for heavy trucks can be tested; these batteries feature a weight of up to 400kg and measure up to 120 x 120 cm.
The heart of the center is a test stand designed to get granular on battery behavior in particularly heavy accidents. It includes a drop tower in which the batteries can be dropped from an altitude of 10 meters. During the free fall from this altitude, the test objects reach a speed of 50 km/h. The fall and the impact against a concrete basis or against another obstacle can be recorded by means of a high-speed camera, enabling test engineers to exactly examine the impact. In order to pass the test, the batteries must not catch fire.
In another part of the building, test machines squeeze the batteries with exactly defined forces. They also can be pierced with a metal thorn. Criteria defined in test standards such as the intruding speed of the thorn are precisely controlled.
The test center allows not only safety testing but also examinations regarding the long-term stability. Specific test stands answer the questions of the battery is sealed against spray water or dust. Do the plastic materials used to build the batteries provide sufficient protection against ultraviolet radiation? Do the materials corrode in atmospheres with high salt content or humidity? How does the behavior of the device under test change at temperatures of -70 °C or below? How does a fast temperature change of 24K per minute affect the battery's long-term stability?
Mechanical stress as it occurs under poor street conditions can be simulated at a vibration test stand. During these tests, the battery has to withstand forces of up to 120 kilo newton which change direction within a fraction of a second.
Being an electrochemical device, lithium ion batteries change their behavior as a function of the charging cycle. For this reason, the batteries under test can be charged or discharged during the test cycle with up to 800 A.
Though the new test center focuses on batteries for cars and trucks, also batteries for two-wheeler such as e-bikes or pedelecs can be tested.All news
Big data sets drones to fly
March 27, 2015
For the last seven years, visiting professor at the University of Maryland Institute for Advanced Computer Studies Dr. Tom ...
CE marking misconceptions
Fraunhofer launches test centre for high-voltage batteries
Auto chip market: upheaval ahead
USD 10,000 worth of components offered in Digi-Key/Silicon Labs IoT contest
Richard Feynman and homomorphic filtering
March 26, 2015
Dennis Feucht discusses his role in preserving the sound of the bongo-playing physicist's voice in audio files that are available ...
Giant spider-bot needs your inspiration
Smart cities will see it all
ST drops in 2014 MEMS ranking, says IHS
- Intelligent Over Temperature Protection for LED Lighting Applications
- Intel helps to Turbocharge Infotainment Systems Designs
- High Performance Portable DC Bench Power Supply: Save Money and Free Up Bench Real Estate by Building Your Own
- Software-Defined Radio Handbook
InterviewInfineon: CAN FD success goes at the expense of FlexRay
The faster version of the venerable CAN bus, CAN FD is currently taking off at several carmakers. Infineon's Thomas Böhm, Head of Body / Automotive, believes this could well go at the expense of FlexRay. ...
Filter WizardCheck out the Filter Wizard Series of articles by Filter Guru Kendall Castor-Perry which provide invaluable practical Analog Design guidelines.
Linear video channel
READER OFFERRead more
This month, Freescale is giving away 5 RIoTboards, worth 74 dollars each, for EETimes Europe's readers to win.
Designed to run Android operating systems efficiently or to run under Linux, the board is based on the Freescale i.MX 6Solo processor; using the ARM Cortex-A9 architecture.
The RIoTboard platform also includes a rich set of peripherals including a 10M/100M/Gb Ethernet port, 1...MORE INFO AND LAST MONTH' WINNERS...
December 15, 2011 | Texas instruments | 222901974
Unique Ser/Des technology supports encrypted video and audio content with full duplex bi-directional control channel over a single wire interface.