Cylindrical Cell Weld Testing For Electric Vehicle Batteries

In this webinar, we examine trends in the EV battery industry and challenges related to mechanical testing, and we discuss solutions that lead to improved testing accuracy, repeatability, and throughput.

This custom-made prismatic battery weld test fixture features a cantilever style hook and alignment fixture for testing the cumulative welding of anode/cathode tabs to their respective current collector. It is also paired with a crosshead extension to provide more space behind and around the specimen/alignment device when using a single column frame. By using the alignment fixture, an operator can ensure the prismatic cell is properly gripped in an upper grip. Fixturing can also be easily swapped out to accommodate different sized prismatic cells and/or welds.

Puncture testing (EN 14477) of separator film is critical to ensure the safety and longevity of each cell throughout the life cycle of a battery. Film must be strong enough to withstand punctures from dendrites that form with extensive use. Ensuring proper specimen tautness and alignment of an upper probe are critical for this application.

Electric vehicle batteries require countless welds between electrodes, tabs, casings, and cells. Understanding the most common failure modes and strength of each weld is critical for determining the life of a battery.