Lithium battery discharge method and charging method

When we buy a new lithium battery electric vehicle, the power lithium battery will have different lengths of storage time. The lithium battery may be in a dormant state at this time, and the capacity needs to be discharged and used several times before it will gradually recover. 　　1. The method of charging the lithium battery itself has no memory effect. The electric cycle can activate the battery and restore normal capacity. Therefore, the new lithium battery in the user's electric bicycle does not need special methods and equipment during the activation process. Not only is this true in theory, but from my own practice, it is best to use the standard method of charging from the beginning, which is the “natural activation” method.　　 Regarding the'activation' problem of lithium batteries, there are many sayings: the charging time must be more than 12 hours, repeated three times in order to activate the battery. This statement of'charging for more than 12 hours for the first three charges' is obviously a continuation of the statement of nickel batteries (such as nickel-cadmium and nickel-metal hydride). So this statement can be said to be misinformation at the beginning. The charging and discharging characteristics of lithium batteries and nickel batteries are very different, and I can tell you very clearly that all the serious official technical materials I have consulted emphasize that overcharge and overdischarge will affect lithium batteries, especially liquid lithium. Ion batteries cause great damage. Therefore, it is best to charge according to the standard time and standard method, especially not to charge more than 12 hours.　　 In addition, lithium batteries or chargers with a BMS protection board will automatically stop charging after the battery is fully charged, and there is no so-called “trickle” charging that lasts for more than 10 hours in nickel battery chargers. In other words, if your lithium battery is fully charged, it is also white charged on the charger. And none of us can guarantee that the characteristics of the battery's charging and discharging protection circuit will never change and the quality will be foolproof, so your battery will be on the verge of danger for a long time. This is another reason why we oppose long charging.　　 Another aspect that cannot be ignored is that lithium batteries are also not suitable for over-discharge, and over-discharge is also very detrimental to lithium batteries.　　Second, when should I start charging in normal use　　I often see this statement, because the number of charging and discharging is limited, so the lithium battery should be used up as much as possible to recharge it. But I found an experimental table on the charge and discharge cycle of lithium ion batteries. The data on the cycle life are listed as follows: 　　 Cycle life (10%DOD):u003e1000 cycles Cycle life (100%DOD):u003e200 times where DOD is discharge Abbreviation for depth. 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, if it is converted to the relative total capacity of actual charging: 10%*1000u003d100, 100%*200u003d200, the latter's full charge and discharge is still better, but the previous netizen's statement needs to be corrected: in normal In this case, you should reserve and charge the battery according to the principle of recharging when the remaining battery power is used up, but if your battery is unlikely to last the entire day on the second day, you should start charging in time. Of course, if you are willing to carry it back It's another matter of bringing the charger to the office. And you need to charge to cope with the anticipated upcoming peak travel times. Even when the battery has a lot of remaining power, then you can just charge it in advance, because you have not really lost the '1' charge cycle life, that is, '0' .x' times, and often this x will be very small.　　 The principle of recharging when the remaining battery power is used up is not to make you go to extremes. A saying that is as widespread as long-term charging is to use up the power of the power lithium battery as much as possible. This approach is actually only the approach on nickel batteries, the purpose is to avoid the memory effect, unfortunately, it is also spread today on lithium batteries. If this method is applied to lithium batteries, at least three, the correct approach to lithium battery electric vehicles, the most important tips for charging and discharging lithium battery electric vehicles in use are: 　　 1. Charge according to the standard time and procedures, in the first few days Operate as required during secondary charging; 　　2, when the battery is too low prompt, you should try to start charging as soon as possible; 　　3, the activation of the lithium battery does not require special methods, in normal use, the lithium battery will be naturally activated. If you insist on using the popular 'first three 12-hour long charge activation' method, it won't actually work.　　 Therefore, all pursuits of 12-hour long charging and automatic shutdown of mobile phones with lithium batteries are wrong. If you did something wrong in the past, please correct it in time, maybe it's not too late.　　Of course, the protection of the lithium battery is quite guaranteed when the protection board of the power lithium battery and the charger's own protection and control circuit are of good quality. Therefore, the understanding of the charging rules is the key point. Under normal circumstances, the lithium battery produced by the unified standard will not be a problem, but because it is a combination of multiple single cells, in some accidental circumstances, such as electric The quality of the core, the hidden failure of the post-processing, the harsh use environment, accidental bumps, etc., will cause some impact on the lithium battery before the lithium battery is abnormal. Therefore, it is necessary to handle the lithium battery with care. Charge and discharge the lithium battery in a reasonable environment. 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: 18650 lithium battery parameters and repair methods