Li-ion battery first charging time and misunderstandings

The capacity of the battery is expressed in mAh (milliampere hour), and the discharge rate of how many milliamperes can be discharged means that it can be discharged for one hour. A 1500mAh battery can be discharged at a discharge rate of 1500 mA for one hour, and at a discharge rate of 500 mA (500 mA), it takes 3 hours. Misunderstanding of lithium-ion battery charging for the first time Misunderstanding 1: The first time charging, do you want to activate the mobile phone battery? First of all, this sentence itself is problematic. Just imagine that the mobile phone and power bank you bought have not been activated, so why do you buy all of them have electricity? That is because they have been activated and tested before leaving the factory. . So don't activate it. In fact, the statement that the first three charges must be charged for 12 hours is obviously a continuation from the early nickel batteries (such as nickel-cadmium and nickel-metal hydride). Modern industrial mobile phones have basically switched to using lithium-ion batteries, which have completely different properties from nickel batteries. So as long as it is charged and fully charged, it can be pulled out. Earlier nickel-cadmium rechargeable batteries and nickel-metal hydride rechargeable batteries, these batteries will have a phenomenon called memory effect. Charging in an incompletely discharged state will cause the battery to overcharge, which will cause the growth of crystals on the electrode plate for a long time. Blocking the contact between the electrolyte and the electrode plate causes the voltage of the battery to drop, making the user feel that the battery is quickly used up. Misunderstanding 2: The battery should be recharged after it is used up? Overcharging will cause the battery to explode? Lithium-ion batteries have high energy density and high voltage (the voltage of a single lithium-ion battery cell can reach 4.2V, while ordinary nickel-based rechargeable batteries are 1.2V). Compared with low-voltage batteries, lithium-ion batteries are charged The oxidation-reduction reaction of the electrode is very violent, so the use conditions of lithium-ion batteries must be strictly restricted. Overcharging, overdischarging, short circuit, high temperature, etc. will cause damage to the battery, and even fire and explosion. However, in actual use, a lithium-ion battery packs several batteries together with a set of safety protection circuits and various safety devices into a battery board. These safety designs can ensure that the circuit of the battery is automatically cut off in the event of overcharging, overdischarging and short circuit; too high internal pressure of the battery will trigger the decompression of the exhaust device; too high battery temperature will trigger the hot melt protection device and block the lithium ion The movement thus stops the electrochemical reaction of the battery. Therefore, as long as you are not using a fake battery of unreliable quality, the battery will not explode if the phone is fully charged and not unplugged in time. Misunderstanding 3: The battery can extend battery life by reducing the number of recharges? The manufacturer of digital equipment will mark that the charge can be charged up to hundreds of times. In fact, it is tested in a deep discharge environment, that is, the battery is used up and then charged to full charge. This cycle, continuous deep discharge The battery has an impact. In fact, our daily charging can only be regarded as a shallow discharge. The battery continues to be charged before it is used up. This way of calculating is better than deep discharge. For batteries, the battery life of shallow discharge is longer than that of deep discharge. . In addition, if the battery is not used for a long time, try to keep it at about 70% power, which is conducive to the maintenance of the battery and reduces the damage to the battery; research shows that the capacity of lithium ion will be obvious when stored for a long time in a fully charged state loss. Similarly, the higher the temperature, the faster the capacity loss of lithium-ion batteries, and this loss is irreversible, that is, the capacity of the battery will permanently become smaller. In a 0 degree environment, a lithium-ion battery with 40% remaining capacity will lose 2% of its capacity after being stored for one year; while in a 40 degree environment, a fully charged lithium-ion battery will lose as much as 35 after one year of storage. %. The specific charging time of the lithium-ion battery for the first time can be determined according to the actual battery capacity. Many people charge a lithium-ion battery for 8 or 9 hours for the first time. In fact, there is no need for such a long time. A long-term lithium-ion battery charge will not help the durability of the mobile phone. At present, most mobile phones are smart phones, with large screens and fast power consumption. Even a large-capacity lithium-ion battery, if the mobile phone is used for a long time, it must be charged once a day. People with fast power consumption can prepare power banks or spare batteries. 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