In line with a press launch from Sandia Nationwide Laboratories, the testing lab now makes use of an indoor tower to drop 200-lb+ weights on lithium-ion batteries in efforts to be taught extra about how batteries reply to stress. This will likely be particularly useful in understanding how electrical car batteries might reply in an car accident.
The fixed push for extra storage and energy drives the necessity for exams equivalent to these supplied by the brand new drop tower, stated Sandia mechanical engineer June Stanley.
“So far as we all know no person within the U.S. has finished any drop exams for impression testing like this,” Stanley stated. The info collected will support in creating safer, extra dependable batteries with extra environment friendly efficiency. It should additionally assist in responding to emergencies, equivalent to electric-vehicle crashes, she stated.
“An impression check like that is extra actual world, extra practical to what would occur,” she stated. “The check can provide us a greater understanding for first responders and the way they deal with an emergency. It can be useful for business researching and creating new know-how.”
The drop tower is inside a 14-ft tall hangar-type constructing that may simply be vented and cleared if there’s smoke from a battery hearth. Researchers management the tower remotely and watch the motion on displays inside a trailer parked about 30 yd away.
A battery sits in a metal tray bolted to a load cell to measure the impression power on the base of the tower as a weight of no less than 200 lb is perched above at heights as much as eight ft, eight in. The push of a button unleashes the load, and gravity takes over. Wires related to the battery and the tower measure pace, power, temperature and voltage. Cameras report the impression and ensuing carnage. Information flashes to computer systems within the trailer.
To this point, the staff has examined single-cell lithium-ion batteries and a 12-pack of such batteries taped collectively. Whereas, the exams haven’t produced the sparks and warmth that will happen in a slower-moving hydraulic crush check, they’ve collected helpful knowledge, Stanley stated.
Within the aftermath of the drop, the batteries are unstable and the security standing of about half the cells is unknown, she stated. “It definitely helps with a greater understanding for first responders to deal with a scenario like that.”
The utmost weight that can be utilized to smash, crush or chop a battery is 500 lb due to the elements chosen, Grosso stated. “That may simply be upgraded, if wanted, and we will preserve including weight to get extra power.”
Information merchandise from Sandia Labs