What is the National Standard for Electric Vehicle Battery Degradation?

[LeJayla]

Electric vehicle battery degradation must comply with the national standard "Requirements and Test Methods for Cycle Life of Power Batteries for Electric Vehicles." When the cycle count reaches 500, the discharge capacity should not be less than 90% of the initial capacity, or when the cycle count reaches 1000, the discharge capacity should not be less than 80% of the initial capacity. Below are detailed specifics about the national standard for battery degradation: National standards related to electric vehicle battery degradation: Electric vehicle battery degradation is mainly divided into two types: normal degradation and abnormal degradation. Normal degradation, as per national regulations, allows for free battery replacement by the manufacturer if the degradation exceeds 20% within the warranty period. However, regarding battery degradation, there are currently no specific national standards in place. Different automakers have varying methods and criteria for assessing battery degradation. Additionally, there are no privately accessible battery testing institutions available in the market, so battery testing can only rely on the manufacturers. From the perspective of battery usage and other factors, the degradation of a vehicle's power battery is influenced by multiple aspects. Abnormal battery degradation: First, there is a decrease in charging capacity or a noticeable reduction in driving range under the same charge level. Furthermore, charging times may increase. Due to battery degradation leading to reduced performance, charging durations may also lengthen. Other symptoms include rapid power depletion and poor durability, which are all signs of abnormal degradation. Another scenario is when the battery hasn't reached 100% charge, but the vehicle's charging system incorrectly identifies it as fully charged, displaying 100% and stopping the charge. The consequence is that although the display shows 100%, the actual charge depletes very quickly and doesn't last long.

[OBrooklyn]

I have thoroughly researched the standards for electric vehicle batteries, and the government has clear regulations on degradation. The core standard is the national standard GB/T 31484-2015, which stipulates that the battery capacity must not fall below 85% of its initial capacity after 500 full charge cycles, nor below 80% after 1,000 cycles. This ensures battery lifespan and safety. Testing must be conducted under standard temperature conditions to simulate real-world charging and discharging scenarios. Why is this important? Because it protects consumer rights and prevents manufacturers from cutting corners. Over the years of driving an electric vehicle, I’ve realized that if the battery degrades too quickly, it can severely impact range and even leave you stranded—a nightmare scenario. My advice is to check the manufacturer’s test reports when purchasing a vehicle to ensure compliance with regulations and avoid being misled, as the battery is one of the core components of an EV. Regular maintenance, such as avoiding parking in high temperatures or sudden acceleration, can also extend battery life—these habits are crucial.