Factors Behind Electric Car Charging Slowdown
The article explains that the charging speed of electric vehicles gradually slows down as the battery's charge level increases, especially after reaching 80%. This is because battery management systems reduce the charging capability to protect lithium-ion cells from damage and excessive heat, leading to a sharp decrease in charging speed at higher levels. While fast chargers rated at 150, 250, or 350 kilowatts can deliver more power at the start of charging, the battery cannot absorb the full capacity as it approaches fullness, which enhances protective systems designed to preserve battery lifespan and reduce cell damage. Studies also confirm that differences between vehicle types, battery chemistries, and ambient temperatures impact the charging curve, as charging from 80% to 100% takes significantly longer than from 20% to 80%. These measures aim to prevent battery damage caused by overcharging and to strike a balance between rapid charging and long-term battery health.
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