18650 lithium 3.7 battery

　　Advantages and disadvantages of 18650 battery

　　The numbers 18650 in lithium battery 18650 represent the external size of the battery: 18 refers to the diameter of the battery, 65 refers to the height of the battery, and 0 refers to the cylindrical shape. General 18650 batteries are divided into lithium-ion batteries, lithium iron phosphate batteries and nickel-metal hydride batteries. The capacity of NiMH battery is generally 2500MAH, and the capacity of lithium battery is generally 1200MAH-3100MAH.

　　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 the rechargeable battery is very high, and its volume is twice that of the Ni-MH rechargeable battery with the same weight, and the life of the lithium battery is extremely slow. In addition, lithium batteries basically have no "memory" and no toxic substances, which are the main reasons for their widespread use. Another thing to note is that lithium batteries are generally marked in English as 7.2Vlithiumionbattery (lithium battery) or 7.2Vlithiumsecondarybattery (lithium secondary battery), 7.2Vlithiumionrechargeablebattery (battery rechargeable battery), so customers must recognize the rechargeable battery when purchasing rechargeable batteries. The logo of the shell, in case the nickel-cadmium and nickel-hydrogen rechargeable batteries are mistaken for lithium batteries due to the type of rechargeable batteries not being recognized clearly.

　　The service life of the 18650 battery is theoretically 1000 cycles of charging. In addition, because 18650 has excellent working reliability, it is widely used in various electronic devices, such as: high-end glare flashlight, portable power supply, wireless data transmission device, electric heating thermal underwear, shoes, Portable instrumentation equipment, portable lighting fixtures, portable copiers, industrial production instruments and equipment, medical equipment, etc.

　　advantage:

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

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

　　3. High safety factor 18650 lithium battery, high safety factor, no explosion, no ignition; non-toxic, zero pollution, certified according to RoHS; various safety factors can be used safely, and the cycle frequency exceeds 500 times; heat resistance Well, the charging and discharging efficiency reaches 100% under the standard of 65 degrees. In order to better avoid the short-circuit failure of the rechargeable battery, the 18650 lithium battery is divided into two levels, positive and negative. Therefore, the probability of its short-circuit fault condition has been reduced to a minimum. A rain shield can be added to prevent the rechargeable battery from being overcharged and lose power, and it can also prolong the service life of the rechargeable battery.

　　4. The working voltage of lithium 18650 high-voltage rechargeable batteries is generally stable, and is far higher than that of nickel-cadmium batteries and nickel-hydrogen rechargeable batteries.

　　5. There will be no memory, no need to empty the remaining power before charging the battery, which is convenient to 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 can even reach below 35mΩ, which greatly reduces the self-consumption of rechargeable batteries and increases the power consumption of mobile phones. The battery life is fully capable of connecting with international standards. Polymer lithium battery, suitable for high current charging and discharging, is the ideal choice for remote operation mode, and it is also the most likely product to replace Ni-MH rechargeable batteries.

　　7. It can be connected in series or in parallel to form a 18650 lithium battery.

　　8. Notebooks, walkie-talkies, portable DVDs, instrumentation equipment, professional audio equipment, model airplanes, small toys, surveillance cameras, digital cameras and other electronic products are widely used.

　　shortcoming:

　　For the 18650 type lithium battery, the biggest disadvantage is that its volume is fixed, and it is not suitable to be installed on some notebooks or some products. Of course, this disadvantage can also be said to be an advantage. Compared with other high-end Polymer lithium battery, which is a disadvantage of customizable and convertible specifications. Compared with some products with specific battery specifications, this has become an advantage.

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

　　The production and manufacture of 18650 lithium batteries must have a maintenance route to prevent excessive charging and discharging of the battery. This is of course necessary for lithium batteries, which 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 batteries cannot carry out high-current charging. discharge, the safety factor is weak.

　　Battery positive electrode materials include lithium nickelate, lithium manganate battery, lithium ternary acid, lithium iron phosphate, etc. Battery positive electrode materials are generally amorphous carbon materials, graphitized carbon materials, silicon-based raw materials, nitrogen compound raw materials, new aluminum alloys wait.