Does Long-Term Fast Charging Harm New Energy Vehicle Batteries?
1 Answers
Long-term fast charging does harm new energy vehicle batteries. Fast Charging: This refers to DC charging. Generally, the DC voltage for fast charging exceeds the battery voltage. Typically, 80% capacity can be reached within half an hour, whereas slow charging takes much longer, potentially requiring over six hours for a full charge. Slow charging uses AC power with relatively low current and power. Although it takes longer, it provides better protection for battery lifespan and incurs lower electricity costs. Impact of Long-Term Fast Charging on New Energy Vehicles: It causes damage to the battery. Most people opt for fast charging to save time. When used long-term, the semi-permeable membrane on the battery's negative electrode surface can partially rupture, leading to reactions between the electrode material and electrolyte. During fast charging, temperatures rise significantly higher than normal, causing electrolyte decomposition, reduced battery capacity, and a substantially shortened battery lifespan. If fast charging is used long-term for new energy vehicles, the damage to the battery is irreversible and will greatly reduce its lifespan. Due to the nature of lithium batteries, which generate electricity through electrochemical reactions, long-term fast charging diminishes the battery's ability to recover. Frequent fast charging also increases the number of charging cycles, thereby reducing the overall cycle life of the battery.
