Charging lithium-ion cells at different rates boosts the lifetimes of battery packs for electric vehicles, Stanford study finds.
Stanford University researchers have devised a new way to make lithium-ion battery packs last longer and suffer less deterioration from fast charging.
“If not properly tackled, cell-to-cell heterogeneities can compromise the longevity, health, and safety of a battery pack and induce an early battery pack malfunction,” said Onori, who is an assistant professor of energy science engineering at the Stanford Doerr School of Sustainability. “Our approach equalizes the energy in each cell in the pack, bringing all cells to the final targeted state of charge in a balanced manner and improving the longevity of the pack.
Intrigued, Onori and two researchers in her lab — postdoctoral scholar Vahid Azimi and PhD student Anirudh Allam — decided to investigate how inventive management of existing battery types could improve performance and service life of a full battery pack, which may contain hundreds or thousands of cells.
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