What process does a lithium battery go through before leaving the factory?

The answer is that the battery needs to be activated, but this is not the user's job. I visited a lithium battery factory. In the early days, lithium batteries have gone through the following process: infusion of electrolyte lithium battery shell-to-seal, constant voltage charging, and then discharging. After several cycles, the electrode is rich in nourishing electrolyte, activated, and has a robust ability to meet the requirements. This is the activation process. Ability, check the battery capacity, select the battery difference classification level of different function (capacity) batteries, ability matching and so on. The resulting lithium battery is now active in the user's hands. Our commonly used nickel-cadmium batteries and nickel-metal hydride batteries are also activated by factory conversion. The activation process of some batteries requires the battery to be turned on and sealed after activation. This process can only be done by the battery manufacturer. ★The so-called secondary activation can also be done. When the user uses a new battery for the first time, try to perform several deep charging and putting cycles. ●But according to my inspection (about lithium battery), the storage period of lithium battery is 1~3 months. It is a deep charge and deep cycle processing, and its capacity travel phenomenon does not exist at all. (I have a battery activation verification statement in the discussion area.) Is it necessary to spend 12 hours in the first three cases? This problem is closely related to the battery activation problem mentioned above. Assuming that the factory battery has electrode passivation on the user's hand, in order to activate the battery, 3 deep charge and discharge cycles are required. In fact, the problem with in-depth charging is not 12 hours of non-charging. So my other article 'On the charging time of mobile phone batteries' answers this question. ★★★The answer is not to charge for 12 hours. In the early days, due to the demand compensation of mobile phone Ni-MH batteries and the trickle charging process, it may take about 5 hours to reach the most perfect charging state, but not 12 hours. The constant current and constant voltage charging characteristics of lithium batteries make the deep charging time less than 12 hours. For example, a 600 mAh battery is set to a current of 0.01C. 6mA), the 1C charging time does not exceed 150 minutes, and then set to the current 0.001 degrees Celsius (0.6mA), and the charging time is 10 hours. This may be due to the accuracy of the instrument, which cannot be accurately obtained now, but it has won the capacity from 0.01 to The calculation of 0.001 degree is only 1.7 mA, and it is meaningless to use for more than 7 hours in exchange for less than three thousandths of the capacity. In addition, there are other charging methods, such as the pulse charging method to make the lithium battery reach 4.2v binding voltage, it will not end at the minimum current stage, generally 150 minutes after 100% full charge. Many mobile phones are charged with pulses. Some people used the cradle charger to confirm the fullness of the mobile phone after filling it up with the flash of the mobile phone in the early years. This check method is not prudent. The green light from the important charger is not a true filling test. ★★Check the voltage of the lithium battery when it is not charging (or discharging) all the way after checking whether the lithium battery is fully or not fully charged. The real purpose of the so-called constant voltage phase current reduction is to gradually reduce the additional voltage caused by the charging current to the internal resistance of the battery. When the current is as low as 0.01c, such as 6mA, the product of the current and the internal resistance of the battery (generally within 200 milliohms) is only 1mV, and the voltage at this time can be regarded as the battery voltage when there is no current. Secondly, the reference voltage of the mobile phone is not necessarily equal to the reference voltage of the seat charging. The mobile phone thinks that the battery is full and charges the seat, while the seat charging thinks that it is not full, but continues charging. 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: Analyze the development direction of lithium batteries for electric vehicles