A recent study from Stanford University Precourt Institute for Energy and the SLAC National Accelerator Laboratory has found that the average lifespan for electric vehicle batteries could be 40% longer than manufacturers expected. Researchers at the SLAC-Stanford Battery Center, a joint initiative between the SLAC National Accelerator Laboratory and the Precourt Institute for Energy found that existing EV batteries could remain functional for much longer than initially forecasted, suggesting that EV drivers may spend less on battery repairs and replacements.
On average, an electric vehicle battery will cost roughly a third of the vehicle’s total value, making it the most expensive component in any EV. The batteries are generally expected to last around a decade before they need replacement but certain driving and charging habits can either increase or decrease an electric vehicle battery’s lifetime. Once EV batteries reach 80% of their original capacity, drivers are encouraged to replace them with new ones.
However, the new SLAC-Stanford Battery Center study indicates that current testing methods may have understated the actual lifespan of EV batteries. Battery engineers and scientists typically use continuous cycles of charging and discharging to determine the life cycle of new battery designs. While this method of rapid charge and discharge cycles can help scientists gather information on new battery designs, it isn’t the best way to determine an electric vehicle battery’s life expectancy, especially if the EV is used for daily commuting.
Senior study author and Stanford Doerr School of Sustainability associate professor of energy science and engineering Simona Onori says the industry hasn’t been properly testing electric vehicle batteries. Current testing methods are fundamentally incompatible with how the average driver uses their electric car, with most drivers using their EVs in a sporadic manner that allows them to preserve their power and reduces the need for regular charging.
The research team designed 4 EV discharge profiles and analyzed 92 commercially available lithium-ion batteries before concluding that EV discharge profiles that closely mirrored real driver behavior typically reflected a higher electric vehicle life expectancy. Using tests that simulate such driving habits, Stanford University researchers found that the average EV will last nearly 50% longer.
While current tests use continuous cycles of charging and discharging, the average driver uses their EV more sporadically, typically driving to the office, grocery store, etc., and letting the car rest while they handle their affairs. Additionally, regenerative braking enables drivers to gain little bits of energy every time they brake, giving their EV batteries a little extra juice every time drive.
These research findings need to be publicized widely in an effort to allay the fears that motorists have about the battery life of electric vehicles. As those fears are addressed, EV brands, such as Cenntro Electric Group Ltd. (NASDAQ: CENN) could benefit from the improved consumer awareness.
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