S A F E B AT T E R I E S 18 months is the duration of the longest test series with prototype battery packs 2 weeks of rest the strained energy sources receive be- fore they are sent back ments. The pitiful endurance runners can’t avoid the next martyrdom test: the T-shocker. “For ten to thirty days, the battery pack must be able to with- stand a temperature drop of -40 °C to +75 °C. These are very typical demands in the automotive indus- try,” Michael Jonca says, letting us marvel. “Here, the strength of the outer casing is strained.” Last hurdle: the swimming pool If the test object is still in a good mood up to this point, the next torture looming ahead will place it in the plunge pool. “This large pool is brand new,” Jonca’s voice echoes through the specialized swim- ming space. On the ceiling is the large crane that lifts the batteries into cold or warm water. “We can also heat the water.” A team of engineers and staff is responsible for each battery pack, since the respective test proce- dures are completely different. “At the moment, we’re testing twelve different test objects, and therefore also twelve different energy sources, for their respective electric vehicles.” If you accompa- ny the nice Mr. Jonca through his torture chambers, you can be sure that the test objects that escape unharmed here will endure almost any torture with ease. (lo) phoenix-testlab.de/en/start The fi rst stop is the electrical test facility. “We’re charging at full power here, boosting to full charge in an hour or two. Several thousands of times. Our power consumption is therefore similar to that of the entire Phoenix Contact production in the neighborhood.” No wonder then that, at the end of this test run, the test objects are left to sit for one or two weeks until they are returned to the client. “The chem- ical reactions in the battery don’t end abruptly; they continue for awhile,” explains the head of the battery laboratory. “The danger of ignition during transit would be too great to return them imme- diately.” Shaking for the shipping industry Things are getting mechanical. We march to the next torture chamber. It sounds like a fairground: “This is our shaker, our shaking chamber. Here we shake the battery pack for about two weeks uninterrupted, combined with an environmental chamber so that we can simulate heat and cold.” The dimensions of the test stand, which is as tall as a house, are enormous. “We lift the test object together with its aggregate frame, which we’ve manufactured, into place with a fi ve-ton crane.” The steel shaking plate alone weighs 35 tons. It’s spring-mounted in the foundation, otherwise the ground would tremble in a wide radius around it,” reports Thomas Worsch. Jonca adds, “Here, we also test components from shipping and industry, not just batteries, but also entire control cabinets.” The test stand vibrates using the “uniaxial vibration method”. To shake a test object in all three dimen- sions, its position on the test system is changed. The test stand also has one more nasty surprise for the specimens: “We also simulate a mechanical shock, such as driving over a curb. That’s a load of up to 50 g on the test object.” The batteries sometimes spend six months, sometimes even almost a year and a half, in the Phoenix Testlab, depending on customer require- 38 UPDATE 4/20 The Phoenix Contact innovation magazine