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
Multiprocessing platform for powerful car computers
July 07, 2015
In today’s passenger cars, at average 70 embedded computers monitor relevant signals and control certain driving functions. ...
Crash test dummy tenses up before impact
Weak currencies zap Europe, Japan in global chip market
BBC to give pocket-sized sensor-computer to UK children
Thin film solar cells may rival silicon
3D printing for photonics: a British initiative
July 07, 2015
Researchers at the University of Southampton are set to investigate the use of 3D printing, or additive manufacturing techniques ...
It's crunch time (again) for EUV lithography
Digi-Key to distribute Monolithic Power Systems worldwide
Autonomous taxis would be green and cost effective says study
- Critical Requirements in High Speed Signal Generation Applications
- The 400XAC Series: Two Major Advantages that Simplify Functional Testing
- A Smart Way to Drive ECU Consolidation
- Autonomous Driving: An Eye on the Road Ahead
InterviewCEO interview: Cadence is about enablement, collaboration
EDA companies are being asked to provide expertise from the circuit- to the system-level observes Lip-Bu Tan, CEO of EDA software vendor Cadence Design Systems Inc. Covering such a breadth of endeavour ...
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, Novelda is giving away two full XeThru Inspiration kits worth 1499 US Dollars each, for EETimes Europe's readers to experiment first hand with its XeThru technology.Based on the use of radio waves, rather than infrared, ultrasound or light, the company's X2M1000 Inspiration modules can detect presence just from the chest movement while breathing, and measure both the rate and... 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.