Improved High-Rate Discharge Process in a Production Line

To ensure reliability, prior to shipment all automotive batteries are subjected to electrical load tests that are performed in accordance with industry accepted standards.  It is essential that the energy discharged from the battery during testing is minimized to avoid the cost and delay associated with recharge.  These basic requirements must be considered when defining the ideal high-rate discharge test process.  Immediately after formation, and preferably after post cleaning, the batteries are discharged at high current for a few seconds.  The voltage under load at the end of test is determined and compared with nominal values to reach a pass/fail decision.  This presentation outlines a new approach to a high-rate discharge (HRD) machine in terms of its assembly, programming flexibility and the ability to discriminate accurately between acceptable and unacceptable batteries.  It will be shown how supplemental evaluation criteria such as Direct Current Internal Resistance (DCR), ACR and a constant current – constant voltage (CCV) discharge curve vs. time can be implemented.  Finally, the presentation demonstrates how the new generation of the HRD machine allows a simplified programming of customized test and evaluation profiles to improve the reliability of the results.  


Mr Michael Wipperfuerth Vice President Sales, CMWTEC Technologie GmbH, Germany

Mr. Michael Wipperfürth graduated 2001 from the Chamber of Industry and Commerce in Frankfurt am Main as a business economist IHK. For five years he worked as a purchasing manager at CMW Automation GmbH.

In 2006 he took over the sales management of CMW for Asia and Europe.

Mr. Wipperfürth joined CMWTEC TECHNOLOGIE GmbH in 2009 and has since been responsible for worldwide sales and marketing of finishing and forming machines. In June 2021 he was promoted to Vice President Sales.