What Causes Battery Degradation in New Energy Vehicles?
2 Answers
Here are the reasons for battery degradation in new energy vehicles: 1. Lithium battery abuse: Lithium batteries show no significant capacity loss when the SOC is below 120%. At excessively high SOC levels, the decomposition rate of the electrolyte increases, forming a thick deposition layer on the graphite anode, which contains precipitated lithium; 2. Temperature factors: Temperature is one of the key factors affecting the lifespan of lithium batteries. Excessively high or low temperatures can reduce the content of active lithium ions, damage the structure of electrode materials, and dissolve metal ions, leading to severe battery capacity degradation.
After driving a new energy vehicle for two years, battery degradation is primarily caused by chemical aging over prolonged use, similar to the gradual deterioration of materials inside the battery. Daily charging habits are crucial—frequent deep discharges or overuse of fast charging can shorten the battery's cycle life. Temperature also plays a significant role, as high temperatures accelerate chemical reactions leading to degradation—for example, parking in direct sunlight during summer can cause faster performance decline. Combined with natural aging, both capacity and range inevitably decrease over time. The key indicator is noticeable range reduction, while maintenance practices like avoiding extreme temperatures can slightly slow the process. In summary, degradation is unavoidable, but adjusting usage habits can help prolong battery health.
