How long can electric car batteries last?

1. Classification of power lithium batteries The power lithium batteries currently used in automobiles are roughly divided into lead-acid batteries, lithium-ion batteries, and nickel-hydrogen batteries. Among them, Ni-MH batteries are only used in Toyota's non-plug-in hybrid vehicles and are not suitable for use as a separate power source; lead-acid batteries are mainly used in low-speed electric vehicles, which is the old man’s music as the saying goes; lithium-ion batteries are the most widely used electric Car power lithium battery. Lithium-ion batteries are divided into many types according to different materials. At present, the most important ones with mature applications are ternary lithium-ion batteries and lithium iron phosphate batteries. The models that use lithium-ion batteries on the market are basically these two types of batteries. Battery life of electric vehicles Second, lead-acid may require dogs. Ni-MH is Toyota's carnival alone, and lithium-ion batteries are king! Let's start with lead-acid batteries. In fact, it is the battery in a general car, and multiple series/parallel connections can be used directly as a power source. This type of battery has a small discharge current (the result is that the car is usually boring), and the models do not run fast. The fastest speed is about 60 kilometers, and the lifespan is relatively short. They must be replaced in a cycle of about 3 years. The advantage is that the production threshold is low, the price is low, and the requirements for the protection circuit and the equalization circuit are lower. Basically, it can be produced in a manual workshop. Disadvantages, slow speed, low power, short life.. New energy vehicles that meet national requirements do not use lead-acid batteries. However, many of the impressions left by this battery in people's minds have been directly transferred to lithium-ion batteries. How long can electric car batteries last? This is the easiest answer and the two types of lithium-ion batteries also have different tempers. Let’s talk about the ternary lithium-ion battery first. Representative cars include Tesla, BAIC, Changan New Energy, E200EV, JAC IEV5, Chery eQ, etc. They are characterized by high energy density, large capacity under the same volume and weight, good battery consistency, and mature production technology. In theory, the cycle life of this type of battery is about 1500 times. In actual use, the full charge and discharge cycle is more than 800 times, and when the battery is discharged at 25%-75%, the actual use can reach more than 1200 times. Seeing this, do you want to say, 800 times, 1 charge per day, less than 3 years will not work? Here, we want to explain the concept of complete circulation. It means that the battery is fully charged and then discharged, which counts as a cycle. If it is used from 100% to 75% every day, and then full, then 4 days will be considered as a complete cycle, and the life span can reach 10 years. Based on a general ternary lithium-ion battery electric vehicle with a battery life of 200 kilometers, one complete cycle can actually travel 180 kilometers, and 800 cycles can travel 144,000 kilometers. Counting normal attenuation, 120,000 kilometers is not too stressful. . At a frequency of 60 kilometers per day, it can be used for 10 years. And if you pay attention to shallow charge and discharge, and maintain the battery well, 1,200 cycles, 150,000 kilometers, basically cover the life of a family car, that is, the battery has the same life as the car, and the battery should not be replaced during the entire cycle. The battery has the same life as the car, so do not replace the battery during the entire cycle. Let’s talk about lithium iron phosphate batteries. The representative model is BYD. This type of battery is characterized by a long cycle life, which can reach more than 2000 cycles; the charge-discharge rate is high, that is, it can have a larger charge-discharge current; and it has good safety. , Bending and puncturing high temperature are no problem. The disadvantage is that the energy density is lower, the same battery life requires more batteries, and the weight and cost of the vehicle are increased accordingly; the consistency is less, and a better battery management system is required; the low temperature attenuation is more obvious, and the capacity will be reduced by 10 at 0°C. %, and the capacity will be reduced by about 30% at -20 degrees. 2000 cycles are already surplus for pure electric vehicles. Even for Qin, which has a battery life of only 70 kilometers, 2000 cycles can support Qin's pure electric drive for 140,000 kilometers. Counting the mileage of gasoline driving, it is no problem to cover the life of the entire vehicle. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Can bulging and leaking batteries work? How to deal with it?