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Polymer lithium ion battery charging activation

by:UFO      2020-01-01
At present, the charging of polymer lithium ion batteries is mainly voltage and current limiting method, with initial constant current (CC) Charging, the battery has the strongest receptivity. With the continuous charging process, the polarization effect is strengthened, the temperature rise is intensified, and the voltage rises. When the charge reaches about 70 ~ At 80%, the voltage reaches the highest charging limit voltage and turns into constant voltage (CV)Charging phase. In the constant voltage stage, there is a so-called trickle charging. It takes about 30% of the time to charge 10% of the electricity, the current intensity decreases, and the temperature rise no longer increases. This process considers the total voltage or average voltage control of the battery pack. In fact, there is always a higher single voltage, and the other batteries in the group have entered the charging stage. Similarly, when discharging, there is a discharged battery in the group, and the damage to the battery caused by overcharge and overdischarge is fatal, the only difference is that overcharge produces a large amount of gas, is easy to self-ignite and explode, and has severe appearance; The appearance of over-discharge changes slowly, but the failure speed is extremely fast, which should be strictly avoided in normal use. In this regard, there is a new lithium battery charging method called parallel control and balanced management, which can separately carry out charge and discharge management and balanced control for each battery-saving core, this kind of dynamic equilibrium focuses on the advantages of discharge equilibrium and charge equilibrium, although there are differences in initial capacity, voltage, internal resistance, etc. between single electrodes, in the work, it can ensure the consistency of the relative charge and discharge intensity and depth, and gradually reach the common end of life. This method is especially suitable for large current discharge. Our company has developed PCB balanced protection for up to 20 series lithium batteries, with a maximum discharge current of 100A. Therefore, when charging the lithium battery, a special lithium battery charger must be used, especially the parameters of the battery core to be matched and consistent. When the lithium battery is used in combination, be sure to add a PCB Protection Board to the battery pack to avoid the battery pack, leakage, even fire, explosion, and extend the service life of the battery as long as possible, but the charge is not enough, increase the number of battery cycles. The activation of polymer lithium ion batteries has always been controversial about whether polymer lithium ion batteries are activated. Some netizens think that the general lithium-ion battery does not need to be activated. Assuming that the battery has been on hold for too long, it can be charged for a few hours after charging. Not for more than 12 hours. The common sense that everyone knows is that the first three times of charging for 12 hours is for the original nickel-cadmium battery. Lithium ion batteries are not because lithium ion batteries have no memory effect. Experts have said that it takes a period of time for the small current to be charged and discharged in the general formation process. In order to form the SEI film on the electrode surface, this is of course impossible for the charger of ordinary users, if there is a saying of activation, how can the manufacturer hand over such an important process to the user? As a result, some users have reported that according to practical experience, the lithium battery needs to be activated because the memory effect cannot be recovered, but if the lithium battery is not activated, the capacity shortage problem can be recovered. No matter what lithium battery is standard on digital equipment, it must be activated when it is activated. Many users do not activate the lithium battery scientifically when using it, resulting in the lithium battery not reaching the optimal capacity, which is easy to make people think this is a memory effect. Generally, batteries have the following activation process: activation process 1: lithium batteries that have just been used generally have the remaining power, so do not charge them at this time. Put the battery into the product for normal use until the battery is too low to start at all. Activation process 2: For the first time, it is best to use the original charger for charging, and it is better to turn off the charger. Many people do not turn off the charger for convenience, which is not conducive to activating the lithium battery capacity. And remind everyone to charge continuously for more than 12 hours and less than 15 hours. If the prompt is full during the period, don't take care to unplug it and keep it charged all the time! Activation process 3: After the first full charge, if it is used normally, it cannot be turned on. You can press process 2 to continue the operation! Activation process 4: full discharge, full charge (Repeat process 2 and process 3)Repeat three times. At this time, the battery is activated successfully and can reach the best capacity state. Precautions: lithium batteries are often activated at the factory, so buyers do not need to activate them again. If the activation period is not recommended, use a universal charger. If you reach the normal use period, you can not use the universal charger. Because the original charger is the most suitable. Universal Charger, the stability of current is not necessarily consistent with the voltage of lithium battery, and has the possibility of accelerating the aging of lithium battery. Polymer lithium ion batteries can be divided into three categories :(1)Solid polymer electrolyte lithium ion battery. Electrolyte is a mixture of polymer and salt. This battery has low ionic conductivity at normal temperature and is suitable for high temperature use. (2)Gel polymer electrolyte lithium ion battery. That is, additives such as plasticizers are added to the solid polymer electrolyte to improve the ionic conductivity and enable the battery to be used at normal temperature. (3)Lithium ion batteries made of polymer cathode materials. Using conductive polymer as cathode material, its specific energy is 3 times that of the existing lithium ion battery, which is the latest generation of lithium ion battery. The new generation of polymer lithium ion batteries is already highly polymerized, so the shape can be thinned (The thinnest 0. 5mm) Any area and any shape, greatly improving the flexibility of battery design, so that it can be made into batteries of any shape and capacity in line with product requirements. At the same time, the unit energy of polymer lithium ion batteries is 50% higher than that of general lithium ion batteries at present, its capacity, charging and discharging characteristics, safety, operating temperature range, cycle life and environmental protection performance are greatly improved compared with lithium ion batteries.
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