“As the size of the cell increases, the chance of something happening increases because you have an increased amount of material being exposed” says Dr. K.M. Abraham. “[Lithium-ion batteries] are not as forgiving as far as design and construction are concerned. If you have quality control issues, it can be very bad.”
Dr. Abraham is a battery consultant and professor at Northeastern University in Boston and has been researching lithium-ion batteries since 1976.