Why do lithium batteries need to be precharged? Is the rechargeable battery in better condition? For many lithium battery counterparts, do not understand why lithium battery charging needs to be pre-charged first? The industry has formed a three-stage strategy for charging lithium-ion batteries: pre-charging, constant current charging and constant voltage charging. So is the rechargeable battery in the best state of charge? This article will discuss it together.
Lithium-ion battery has no memory effect, but has a strong inertia. It should be fully activated to ensure the best performance in future use. Before the battery leaves the factory, the manufacturer has carried out the activation process and pre-charged it. This is mainly due to the high energy ratio of lithium-ion batteries. If you directly enter the fast charging mode, it will affect the service life of the lithium battery or damage the battery. In order to avoid this phenomenon, there is a pre-charge argument.
Lithium battery charging.jpg
Lithium batteries are generally pre-charged before they leave the factory, and users do not need to do any pre-charging. Generally, it is misleading by the merchant to say that the first charge takes 10 hours. This does not matter. Lithium battery system is a chemical power system. Pre-charging is to activate chemical substances, so that the battery can truly generate electricity. Without this pre-charging process, the battery is only a semi-finished product, not a real battery.
In practical applications, no one can distinguish between the pre-charge and formal charging of lithium batteries. In fact, the chemical reaction of charging has a starting process. When charging the lithium battery, because the constant current may be too large, the battery may be damaged, so pre-charge first, first activate the active material, and then charge the battery normally.
For lithium battery manufacturers, a circuit protection board is built in the battery design. Under normal circumstances, the chance of overcharging or overcharging the battery is very small, but if the battery is not precharged at first, it will bring many hidden dangers, such as the protection board. Failure, self-discharge rate of long-term storage, etc., when the battery is over-discharged, it will cause the recovery of the active material to be difficult. First, charge it to 2.5V to 3.0V with a small current, and then convert to fast charge. The pre-charged small battery can effectively solve the problem. Discharge the battery charging problem.
Is there a better condition for rechargeable batteries?
rechargeable battery is a rechargeable battery with a limited number of recharges, used in conjunction with a charger.
There is a saying that if the rechargeable battery is used properly, the best state will appear in a certain cycle range, that is, the maximum capacity. This depends on the situation. Sealed Ni-MH batteries and Ni-Cd batteries, if used properly (such as regular maintenance to prevent the generation and accumulation of memory effects), will generally reach their maximum capacity after 100 to 200 cycles, such as After 120 cycles of a Ni-MH battery with a factory capacity of 1000mAh, its capacity may reach 1100mAh.
Nickel-based batteries have the best conditions, generally reaching their maximum capacity between 100 and 200 cycles. For liquid lithium-ion batteries, such a cycle capacity hump phenomenon does not exist at all. From the time the lithium-ion battery leaves the factory to the final battery scrap, the performance of its capacity is to use once less once. I have never seen any signs of capacity recovery when doing cycle performance on lithium-ion batteries.
Lithium-ion batteries are not in the best condition. Lithium-ion batteries are more susceptible to changes in ambient temperature and exhibit different performance. They will show their best performance at an ambient temperature of 25 to 40 degrees, and their performance will be greatly reduced in low or high temperature conditions. To make your lithium-ion battery fully display its capacity, you must pay careful attention to the use environment to prevent high and low temperatures.
Because the lithium battery has a higher energy ratio, it is necessary to strictly avoid the phenomenon of overcharging and overdischarging in the use of the battery. Before installing the battery, make sure that the battery is in normal working condition, which not only saves time, but also saves some money.