3.7v 18650 lithium battery.Advantages and disadvantages of 18650 battery

　　Lithium battery pack (Li-ion, LithiumIonBattery): Lithium batteries are widely used because of their light weight, large volume, and no memory. Many digital products use lithium batteries as switching power supplies, although their prices are relatively expensive. . The specific energy of rechargeable batteries is very high, and its volume is twice the specific energy of nickel-metal hydride rechargeable batteries of the same weight. The life of lithium batteries is extremely slow. In addition, lithium batteries have basically no "memory" and no toxic substances, which is an important reason for their widespread use. It is also important to note that lithium batteries are generally labeled in English as 7.2Vlithiumionbattery (lithium battery) or 7.2Vlithiumsecondarybattery (lithium secondary battery), 7.2Vlithiumionrechargeablebattery (battery rechargeable lithium battery). Therefore, when purchasing rechargeable batteries, customers must recognize the rechargeable battery machine clearly. The mark on the casing is to prevent the nickel-cadmium and nickel-hydrogen rechargeable batteries from being mistaken for lithium batteries due to failure to recognize the type of rechargeable battery.

　　The basic theory of service life of 18650 battery is 1000 cycles of battery charging. In addition, because 18650 has excellent working reliability, it is widely used in various electronic industries, such as: high-end bright flashlights, portable power supplies, wireless data transmitters, electric heating underwear, shoes, Portable instruments and equipment, portable lighting fixtures, portable copiers, industrial production equipment, medical equipment, etc.

　　advantage:

　　1. The capacity of the large-capacity 18650 lithium battery is generally between 1200mah and 3100Mah, while the average battery capacity is only about 800. If it is combined with the 18650 lithium battery, then the 18650 lithium battery can easily increase the capacity to 5000Mah.

　　2. The 18650 lithium battery has a long life, and the normal use cycle life can reach more than 500 times, which is more than twice as long as the cycle times of ordinary batteries.

　　3. High safety 18650 lithium battery has high safety, no explosion, no ignition; non-toxic, zero pollution, passed RoHS certification; various safety factors can be used with confidence, the cycle frequency exceeds 500 times; heat-resistant properties Well, the charge and discharge efficiency reaches 100% under the 65-degree standard. In order to better avoid short circuit failure of the rechargeable battery, the 18650 lithium battery is divided into two levels, positive and negative. Therefore, the probability of short-circuit fault conditions is minimized. A weather shield can be added to prevent the rechargeable battery from being overcharged and losing power, and can also extend the service life of the rechargeable battery.

　　4. The working voltage of lithium 18650 high-voltage rechargeable batteries is generally high, and is much higher than the working voltage of nickel-cadmium batteries and nickel-metal hydride rechargeable batteries.

　　5. There is no memory, so you don’t have to drain the remaining power before charging the battery, which is convenient for use.

　　6. Small internal resistance: The internal resistance of polymer batteries is smaller than that of ordinary liquid lithium batteries. The internal resistance of domestic polymer batteries even reaches below 35mΩ, which greatly reduces the self-consumption of rechargeable batteries and increases the use of mobile phones. The battery life is completely comparable to that of the international market. Polymer lithium batteries are suitable for high-current charging and discharging. They are an ideal choice for remote operation and are the most likely product to replace nickel-metal hydride rechargeable batteries.

　　7. Can be connected in series or in parallel to form 18650 type lithium battery.

　　8. Widely used in notebooks, wireless walkie-talkies, portable DVDs, instrument equipment, professional audio equipment, model aircraft, small toys, surveillance cameras, digital cameras and other electronic products.

　　shortcoming:

　　For the 18650 lithium battery, the biggest drawback is that its capacity is fixed and is not suitable for installation on some notebooks or some products. Of course, this drawback can also be said to be an advantage, compared with other high-performance batteries. Polymer lithium battery, this is a drawback of customizable and convertible specifications. This is another advantage when compared to products with certain battery specifications.

　　Compared with ordinary rechargeable batteries, 18650 lithium batteries are more prone to short circuit failures, explosions and other accidents. If compared to ordinary rechargeable batteries, these shortcomings are not as obvious.

　　Manufacturers of 18650 lithium batteries must have maintenance routes to avoid excessive charging and discharging of rechargeable batteries. This is of course necessary for lithium batteries, and it is also one of the shortcomings of lithium batteries, because most of the materials used in lithium batteries are lithium cobalt oxide batteries, and lithium batteries made of lithium cobalt oxide battery materials cannot be charged with large currents. discharge, the safety factor is weak.

　　Battery cathode materials include lithium nickel oxide, lithium manganate battery, lithium tribasic acid, lithium iron phosphate, etc. Battery cathode materials are generally amorphous carbon materials, graphitized carbon materials, silicon-based materials, nitrogen compound materials, and new aluminum alloys. wait.

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