About the charging method of the new battery and the maintenance analysis of the lithium battery of the electric vehicle

1. The charging method of the new battery is related to the activation of the lithium battery. This statement is another old topic. A large number of customers think that the battery needs to be activated. Almost all sales staff say that the first three charging of the battery is required. It has been overflowing for 12 hours. This statement is clearly a continuation of nickel batteries (such as nickel-cadmium and nickel-metal hydride). So this statement can be said to be misinformation at the beginning. The charge and discharge characteristics of lithium batteries and nickel batteries are very different, and it can tell us very clearly that all the strict official technical data I have reviewed emphasize that overcharge and overdischarge will affect lithium batteries, especially liquid lithium. The battery causes huge damage. Then the battery demand is activated? The answer is yes, the demand is activated! However, this process is completed by the processing manufacturer, has nothing to do with the user, and the user has no ability to complete it. The real activation process of a lithium battery is as follows: the lithium battery shell is filled with electrolyte-sealed-formed, which is constant voltage charging and then discharging. This is done for several cycles, so that the electrode is fully infiltrated and the electrolyte is fully activated until the capacity is reached. Request to stop, this is the content of the activation process, that is, the lithium battery has already been activated in the user's hands after leaving the factory. In addition, during the activation process of some batteries, the battery needs to be in an open state. After activation, it will be sealed again. Unless you have battery processing equipment, how will it be completed? The battery will be experienced from the factory, and then sold, and then in the hands of the user. For a period of time, one month or several months, the electrode data of the battery will be passivated. The manual suggests that the battery used for the first time should be fully charged and discharged three times in order to quickly eliminate the dullness of the electrode data. To achieve the highest efficiency. However, this process does not require 12 hours at all, and it should be aborted. Passivation can also be eliminated in normal operation for a period of time. Therefore, the user does not need special methods and equipment during the activation process of the new lithium battery. In addition, the lithium battery or the charger will automatically stop charging after the battery overflows, and there is no so-called trickle charge that lasts for more than 10 hours in the nickel battery charger. In other words, if your lithium battery is overflowing, it is also white charged on the charger. And none of us can ensure that the characteristics of the battery's charging and discharging protection circuit will never change and the quality is fully assured, so your battery will probably be on the verge of risk for a long time. This is another reason why we oppose long charging. On some machines, after charging for more than a certain period of time, assuming that the charger is not removed, the system will not only stop charging at this time, but also start a discharge-charge cycle. Perhaps the manufacturer of this approach has its own purpose, but it is clearly detrimental to the life of the battery. At the same time, long-term charging requires a very long time and often needs to be carried out at night. According to the situation of my country's power grid, the voltage at night in many places is relatively high and fluctuates greatly. As mentioned earlier, lithium batteries are very delicate, and their ability to withstand fluctuations in charging and discharging is much worse than that of nickel batteries, so this brings additional risks. 2. When should the charging start in normal operation? Because the number of charging and discharging is limited, the lithium battery should be used up as much as possible to recharge it. But I found an experiment table about the charge and discharge cycle of lithium batteries. The data about the cycle life is listed as follows: Cycle life (10%DOD):u003e1000 cycles (100%DOD):u003e200 times during which DOD It is the abbreviation of Depth of Discharge. It can be seen from the table that the number of rechargeable times is related to the depth of discharge, and the cycle life at 10% DOD is much longer than that at 100% DOD. Of course, assuming that it is equivalent to the relative total capacity of charging: 10%*1000u003d100, 100%*200u003d200, the latter is still better for thorough charging and discharging, but the previous netizen’s statement needs to be corrected: Under normal conditions, you should reserve and charge the battery according to the principle of recharging when the remaining battery power is used up. However, assuming that your battery cannot last the entire day on the second day, you should start charging in time. Of course, you assume that you are willing Carrying the charger to the office is another matter. 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: What are the advantages and disadvantages of capacitive lithium batteries?