Does the number of charging times of electric vehicles have an opposite effect on battery loss?

The current power lithium-ion batteries used in new energy cars are mainly three-element lithium batteries, lithium cobalt oxide batteries, and lithium iron phosphate batteries. No matter which type of battery, there is a service life. Power lithium The life span of the ion battery is calculated according to the number of cycles. The more the number of charge and discharge, the shorter the life span of the battery. Regarding the number of cycles of power lithium-ion battery cells, the national mandatory requirement must be more than 1000 times. Lithium iron phosphate can generally be used for 2000 times, and ternary lithium batteries can generally be used for more than 1000 times. The number of cycles mentioned here does not mean that it can only be charged 1000 times, but refers to the number of deep charging and discharging, that is, the number of cycles is almost used up and then recharged. This is the number of cycles. If the battery is not completely used up, the time continues Charging is not actually counted as the number of times of deep charge and discharge. In order for everyone to have a more intuitive understanding, let's take the BAIC EU series as an example. The ternary lithium battery of the BAIC EU series Quick Change Lotto has a capacity of 45kWh, and NEDC summarizes a driving range of 300 kilometers under normal conditions. Assuming that we travel 600 kilometers a week, it is equivalent to 2 deep charge and discharge times in a week. , The need for deep charge and discharge 104 times a year, and the number of deep charge and discharge of the ternary lithium battery is about 1,000 times, so it means that the battery life of the BAIC EU series can theoretically reach about 10 years. Of course, this time is only a theoretical reference. The practical life of power lithium-ion batteries is also directly related to our usual car habits, external environment temperature, charging habits and other behaviors. For example, long-term parking under power-deficient conditions, frequent running until the battery is completely discharged, long-term travel in a low-temperature environment, etc., simply cause the life of the battery to decrease. If you want to extend the life of the power lithium-ion battery, it is best The method is to charge and overflow in time every time about 20-30% of the power is left. At that time, the power lithium-ion batteries used in my country's new energy cars can basically be divided into two types: ternary lithium batteries and lithium iron phosphate batteries. Lithium batteries have a certain capacity, and its capacity is the charge and discharge capacity of the battery. As the battery usage time increases, its charge and discharge capacity will continue to decrease. The lost capacity is the loss of the battery, and the process of battery loss is its decay process. According to national regulations, when the power lithium-ion battery of a new energy car decays below 80%, that is, when the battery loss is more than 20%, it is no longer suitable for continuous use on a new energy car. It should be regarded as the end of the service life of the power lithium-ion battery. Enter the echelon application link. In other words, the degree of battery wear is the only basis for judging whether the service life of the power lithium-ion battery is over. It is generally believed that the number of charging cycles determines the service life of a lithium battery. The so-called number of charging cycles refers to the process of the lithium battery from being fully charged to the battery level to zero, and then recharged. If someone drives a new energy car to and from get off work every day, the vehicle needs to consume 50% of the electricity, then this new energy car’s lithium-ion battery needs 2 days to complete a charging cycle; later he changed his work address and still uses the same new car Energy cars only consume 10% of the electricity when commuting to and from get off work, so it takes 10 days to complete a charging cycle. Of course, if the amount of charge and discharge for each use of the car is not fixed, it is difficult to judge how long it takes to complete a charging cycle. In the test room, the engineer measured by the method of successively charging and charging that the ternary lithium battery will decay to 80% after 800 charging cycles, that is, the battery has lost 20%; while the lithium iron phosphate battery passes It takes only 2000 charging cycles to lose 20%. At this point, the service life of the battery can be regarded as over. The engineer also found in the experiment that whether it is a ternary lithium battery or a lithium iron phosphate battery, if the shallow charging method is adopted for charging and discharging, its service life will be much longer. The number of charging cycles of the ternary lithium battery can be very high. Break 1000 times easily. It can be seen that although it is the number of charging cycles that determines the degree of lithium battery loss, multiple shallow charging can also complete a charging cycle. Therefore, the number of recharges can affect the loss of the battery. Of course, the number of recharges refers to the charging of the battery with current, not just plug in the charging gun. Before answering this question, we should first know how the power lithium-ion battery life is defined. The life of power lithium-ion battery is divided into cycle life and time life. The cycle life can be known as the working life. The lifespan at a time is well known, that is, the lifespan of the battery data itself, which can generally reach 8 to 10 years. The question of whether the number of recharges affects the battery life belongs to the scope of the cycle life. The cycle life refers to the number of times the battery can be recycled. It is a cycle to charge the battery once and then discharge it again. Different batteries have different cycles of service life. Generally, the cycle life of a ternary lithium power lithium-ion battery is about 1500 to 2000 times. So the number of recharges alone will not affect the life of the battery. The life span of the power lithium-ion battery will only decrease according to the number of cycles. In accordance with the relevant national regulations on power lithium-ion batteries, it is necessary to maintain more than 90% of the original battery condition after 500 cycles of power lithium-ion batteries, and 80% of the original battery condition can be maintained after 1000 cycles of use. This standard is the country's most basic standard for the service life of power lithium-ion batteries. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Detailed explanation of battery maintenance