Does the new mobile phone battery need to be activated?

The battery needs to be activated, but this is not what the user has to do, but what the lithium battery processing manufacturer has to do. Why is this? Because lithium batteries go through the following process before leaving the factory: the new mobile phone battery lithium battery shell is filled with electrolyte and sealed-formed, which is constant voltage charging and then discharging. This is done for several cycles, so that the electrode is fully infiltrated in the electrolyte, fully activated, and the capacity is Until the requirements are met, this is the activation process-capacity division, which is to detect the capacity of the battery and select batteries with different performance (capacity) to classify, classify the battery, perform capacity matching, etc. The lithium battery in this way is already in the hands of the user It has been activated. The commonly used nickel-cadmium batteries and nickel-metal hydride batteries are also formed and activated before leaving the factory. The activation process of some of the batteries requires the battery to be opened and sealed after activation. This process can only be used as a lithium battery. The battery processing manufacturer has come to complete. There is a problem here, that is, the time for the battery from the battery factory to reach the user, this time can sometimes be very long, as short as 1 month, and as long as half a year. At this time, the battery electrode material will be dull. Therefore, the manufacturer proposes that the battery used for the first time should be fully charged and discharged 35 times in order to eliminate the passivation of the electrode material and achieve the maximum capacity. In 2001, three related nickel-hydrogen batteries, nickel-cadmium batteries and lithium batteries were issued. In the national standard, the initial capacity test is clearly stipulated. The battery can be deeply charged and discharged for 5 times. When one meets the regulations, the experiment can be stopped. This explains this phenomenon well. Then call it It is also possible to activate it for the second time. Try to perform several deep charge and discharge cycles for the new battery used by the user for the first time. This problem is closely related to the battery activation problem above. Let's set the factory battery to the user's hand to have electrode passivation. Phenomenon, in order to activate the battery to perform deep charge and deep discharge cycles 3 times. In fact, this question is transformed into a question of whether deep charge is to charge for 12 hours. Then my other article on the charging time of mobile phone batteries has answered this question. Answer Don’t charge for 12 hours. In the early days of mobile phone Ni-MH batteries needed to be refilled and trickle-charged, it would take about 5 hours to reach the perfect full charge state, but it would not take 12 hours. And the constant time of lithium batteries The characteristics of current and constant voltage charging determine that its deep charging time does not need to be 12 hours. Some people will talk about lithium batteries. Since the current of lithium batteries is gradually reduced during the constant voltage stage, is it true when the current is as small as infinitely small? Deep charge. I once drew a curve of current reduction vs. time in the constant voltage stage, and performed curve fitting several times. I found that this curve can be close to zero current by a function of 1/x. The actual detection is because of the lithium battery itself. Existing self-discharge phenomenon, this zero current can never be reached. Take a 600mAh battery as an example, set the cut-off current to 0.01C (ie 6mA), and its 1C charging time does not exceed 150 minutes, then set the cut-off current to 0.001 C (that is, 0.6mA), its charging time may be 10 hours. Because of the accuracy of the instrument, it has not been accurately obtained, but the capacity obtained from 0.01C to 0.001C is calculated to be only 1.7mAh, with 7 more used How many hours to exchange for less than three thousandths of the capacity is There is no practical significance. Besides, there are other charging methods, such as pulse charging method to make the lithium battery reach the limit voltage of 4.2V. It does not cut off the minimum current judgment stage at all. Generally, it is 100% fully charged after 150 minutes. Many mobile phones use pulse charging. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete the previous article: How to charge lithium iron phosphate batteries and lead-acid batteries?