18650 lithium battery and 26650 lithium battery which is better?

Lithium-ion batteries have the advantages of light weight, high capacity and no recall effect, thus gaining popularity. Many digital devices use lithium-ion batteries as a power source, although their price is relatively expensive. The energy density of lithium-ion batteries is very high, its capacity is 1.5 to 2 times that of nickel-metal hydride batteries of the same weight, and has a very low self-discharge rate. In addition, lithium-ion batteries have almost no "recall effect" and do not contain toxic substances, which is an important reason for their widespread use. There are many varieties of Li-ion batteries, so this article compares the two types of Li-ion batteries, Li-ion 18650 and Li-ion 26650.

 

 

A. 18650 lithium battery

 

18650 lithium battery in which 18 indicates the diameter of 18mm, 65 indicates the length of 65mm, 0 indicates that the cylindrical battery. General 18650 battery in the industrial use of more, civilian use is rare, common in the notebook battery and advanced torch used more.

 

 

(A) 18650 lithium battery advantages

 

1,large capacity 18650 lithium battery capacity is generally 1200mah ~ 3600mah, while the general battery capacity is only about 800mah, if combined into 18650 lithium battery pack, that 18650 lithium battery pack is sloppy can break the 5000mah.

 

2,long life 18650 lithium battery life is very long, the normal use of the cycle life of up to 500 times, is more than twice the ordinary battery.

 

3,high safety features 18650 lithium battery safety features, non-explosive, non-combustion; non-toxic, non-polluting, after the RoHS trademark certification; a variety of safety features in one go, the number of cycles is greater than 500 times; high temperature resistance function is good, 65 degrees under the conditions of discharge efficiency of 100%. To avoid the short-circuit phenomenon of the battery, the positive and negative poles of 18650 lithium battery are separated. Therefore, the possibility of short circuit has been reduced to the extreme. Maintenance plates can be added to avoid overcharging and discharging the battery, which can also extend the service life of the battery.

 

4,high voltage 18650 lithium battery voltage is generally at 3.6V, 3.8V and 4.2V, much higher than the 1.2V voltage of NiCd and NiMH batteries.

 

5,No recall effect no need to empty the remaining power before charging, easy to use.

 

6,Small internal resistance: the internal resistance of polymer cells is smaller than that of general liquid cells, and the internal resistance of domestic polymer cells can even be less than 35mΩ, which greatly reduces the battery's self-consumption and extends the standby time of mobile phones, and can completely reach the level of international standards. This kind of polymer lithium battery which supports large discharge current is the ideal choice for RC models and has become the most promising product to replace NiMH batteries.

 

7,Can be combined in series or parallel into 18650 lithium battery pack

 

8, the use of a wide range of laptop computers, walkie-talkies, portable DVDs, instruments, audio equipment, models, toys, video cameras, digital cameras and other electronic equipment

 

 

(B) 18650 lithium battery defects

 

The biggest defect of 18650 lithium battery is that his volume has been fixed, installed in some notebooks or some products are not very good positioning, of course, this defect can also be said to be an advantage, which is relatively other lithium polymer batteries and other lithium batteries can be customized and can be changed in terms of size this is a defect. In contrast to some specified battery specifications of the product has become an advantageous location.

 

18650 lithium batteries are prone to short circuit or explosion, but also relative to lithium polymer batteries, if relative to the general battery, this defect is not so significant.

 

18650 lithium battery production are required to have maintenance lines to avoid the battery is overcharged and lead to discharge. Of course, this is necessary for lithium batteries, which is also a general disadvantage of lithium batteries, due to lithium batteries are simply lithium cobaltate information, and lithium cobaltate information lithium batteries can not be discharged at high current, poor safety.

 

18650 lithium batteries require high production conditions, related to the general production of batteries, 18650 lithium batteries require high production conditions, which undoubtedly increases the production costs.

 

 

Second, 26650 lithium battery

 

26650 lithium battery is a type of cylindrical lithium battery specifications. Used in power tools, lighting, landscape energy storage, electric vehicles, toys, instruments, ups backup power, communication equipment, medical equipment and military lights. The definition of its type of law: 26650 type, that is, the diameter of the battery is 26mm, the length of 65mm, cylindrical type of battery.

 

(A) 26650 lithium battery general electric function

 

Cycle function: 2000 times (1C charge/1C discharge, capacity retention ≥ 80%, 100% DOD)

 

Maximum continued discharge current: 9.6A

 

Pulse discharge current: 15A, 5s

 

Operating temperature: Charging: 0°C~55°C; Discharging: -20°C~60°C

 

Storage temperature: -20°C~45°C

 

Battery weight: 86g (approx.)

 

 

Third, 18650 lithium battery and 26650 lithium battery which is better?

 

1, battery volume comparison: 26650 lithium battery volume than 18650 lithium battery volume, their cell height is the same, the cell diameter is different, 26650 lithium battery cell diameter of 26mm, and 18650 lithium battery cell diameter of 18mm.

 

2, battery capacity comparison: equal battery data 26650 battery capacity than 18650 battery capacity to be larger, assuming the same ternary information 26650 battery is generally in about 5200mAh, while the 18650 battery capacity of about 2600mAh.

 

3, application environment comparison: 18650 lithium batteries are used in lighting lamps and lanterns, industrial lithium batteries, power tool batteries, electric bicycle batteries, power lithium batteries, etc., while 26650 lithium batteries are used in integrated solar street light lithium batteries, energy storage stations, solar energy storage batteries, etc.