Many electric car owners may have such questions: how is the battery decay state after five years of driving, and how long will it last? Is the number of battery health on the dashboard unreliable? A few days ago, the new national standard for the durability of electric vehicle power batteries was officially implemented. Referring to this standard, we can clearly understand the status of the power battery of electric vehicles. ↓ the available energy status of the battery must be displayed on board. The power battery is the core component of electric vehicles, its durability directly affects vehicle use experience, after-sales guarantee, second-hand circulation and even recycling. The recommended national standard for battery durability of electric vehicles mainly covers the available energy state of batteries and the setting of durability limits. Yu Yang, the drafter of the power battery durability standard, pointed out that one of the main contents of the standard is to regulate the available energy state of the battery, that is, the ratio of the current actual available energy of the battery to the available energy of the new car battery. The higher the battery available energy state value, the more sufficient the battery available energy. The standard requires that the available energy status of the battery can be displayed on the vehicle, and the display accuracy is strictly required. Available energy status of vehicle battery

the error with the actual measured value shall not exceed 5% of the available energy status of the battery displayed on the vehicle. How to specify the specific accuracy? How to verify its accuracy? According to experts, the available energy state of the battery is different from the number of cycles of the battery. It comprehensively reflects the degree of attenuation of the real battery and is closer to the attenuation of the endurance that users truly perceive. The new national standard requires that the deviation between the available energy state reading of the battery displayed on the vehicle and the actual measured value of the available energy state of the vehicle shall not exceed 5%.

In addition, the standard also introduces the concept of "virtual mileage" to measure the discharge of non-driving batteries and calculate the equivalent mileage of this part of discharge energy in combination with the energy consumption of vehicles, the relative deviation between the virtual mileage converted value displayed by the vehicle and the measured value is not more than 3%. After 5 years or 100000 kilometers, the battery usage is at least 82%. In addition to the display requirements on the available energy status of the battery, the standard also requires the minimum durability of the vehicle. Take the light passenger car as an example: when it is used for 5 years or 100000 kilometers, the available energy state of the corresponding battery reaches more than 82%. 8 years or 160000 kilometers, reaching more than 75%. 10 years or 200000 kilometers, reaching more than 70%. Experts said that the recommended national standard is currently released, and it is expected to be promoted and used in the whole industry in the later period. For consumers, the vehicle battery attenuation situation is mastered in real time, with evidence and transparency to check, and warranty disputes are expected to decrease. For the industry, the standards will guide enterprises to invest plus-sized in accurate evaluation of battery life and long service life research and development of battery technology, and promote the transformation of the industry from scale expansion to quality improvement.