What is the difference between 18650 lithium battery and 26650 lithium battery?
Back
2023/09/25 09:37:06
Lithium-ion battery (Li-ion, LithiumIonBattery) : Lithium-ion battery has the advantages of light weight, large capacity, no memory effect, and so has been widely used, many digital devices have used lithium-ion battery as a power supply, although its price is relatively expensive. Lithium-ion batteries have a high energy density, and their capacity is 1.5 to 2 times that of nickel-metal hydride batteries of the same weight, and they have a very low self-discharge rate. In addition, lithium-ion batteries have almost no "memory effect" and do not contain toxic substances and other advantages are also important reasons for its wide application. There are also many types of lithium batteries, and this paper compares the two kinds of lithium batteries, 18650 lithium batteries and 26650 lithium batteries.
18650 lithium battery and 26650 lithium battery which is good -- 18650 lithium battery introduction
18650 is the originator of lithium-ion batteries - Japan's SONY company set a standard lithium-ion battery model in order to save costs, in which 18 indicates a diameter of 18mm, 65 indicates a length of 65mm, 0 indicates a cylindrical battery. Generally, 18650 batteries are used more in industry, and few in civilian use, and they are commonly used in notebook batteries and high-end flashlights.
18650 lithium battery advantages
1, the capacity of 18650 lithium battery is generally between 1200mah~3600mah, and the general battery capacity is only about 800mah, if combined into 18650 lithium battery pack, the 18650 lithium battery pack can easily break through 5000mah.
2, long life 18650 lithium battery life is very long, normal use of the cycle life of more than 500 times, is more than twice the ordinary battery.
3, high safety performance 18650 lithium battery high safety performance, no explosion, no combustion; Non-toxic, pollution-free, through RoHS trademark certification; All kinds of safety performance in one go, the number of cycles is more than 500 times; Good high temperature resistance, 65 degrees of power down efficiency of 100%. In order to prevent short circuit of the battery, the positive and negative electrodes of the 18650 lithium battery are separated. So the possibility of a short circuit has been reduced to the extreme. You can install a protection plate to avoid overcharging and overdischarging the battery, which can also extend the service life of the battery.
4, high voltage 18650 lithium battery voltage is generally 3.6V, 3.8V and 4.2V, much higher than the nickel-cadmium and nickel-metal hydride battery voltage of 1.2V.
5, no memory effect does not have to empty the remaining power before charging, easy to use.
6. Small internal resistance: the internal resistance of the polymer cell is smaller than that of the general liquid cell, and the internal resistance of the domestic polymer cell can even be below 35mΩ, which greatly reduces the power consumption of the battery, extends the standby time of the mobile phone, and can fully reach the level of international standards. This polymer lithium battery, which supports large discharge currents, is an ideal choice for remote control models and has become the most promising alternative to Ni-MH batteries.
7. 18650 lithium battery pack can be synthesized in series or combined
8, use a wide range of laptop computers, walkie-talkies, portable DVDS, instruments, audio equipment, model aircraft, toys, cameras, digital cameras and other electronic equipment
18650 lithium battery disadvantages
The biggest disadvantage of the 18650 lithium battery is that its volume has been fixed, and it is not very well positioned when it is installed in some notebooks or some products, of course, this shortcoming can also be said to be an advantage, which is a disadvantage compared to the customizable and scalable size of lithium batteries such as other polymer lithium batteries. And relative to some specified battery specifications of the product has become an advantage.
18650 lithium batteries are prone to short circuit or explosion, but also relative to polymer lithium batteries, if relatively general batteries, this shortcoming is not so obvious.
The production of 18650 lithium batteries requires a protection line to prevent the battery from being overcharged and resulting in discharge. Of course, this is necessary for lithium batteries, which is also a disadvantage of lithium batteries, because the materials used in lithium batteries are basically lithium cobalt acid materials, and lithium cobalt acid lithium batteries can not be large current discharge, and the safety is poor.
18650 lithium battery production conditions are high, relative to the general battery production, 18650 lithium battery production conditions are very high, which undoubtedly increases the cost of production.
18650 lithium battery and 26650 lithium battery which is good -- 26650 lithium battery introduction
26650 lithium battery is a type specification of cylindrical lithium battery. Used in power tools, lighting, landscape energy storage, electric vehicles, toys, instruments, ups backup power, communication equipment, medical equipment and military lighting fields. The definition of its model is: 26650 type, that is, the diameter of the battery is 26mm, the length is 65mm, and the cylinder type battery.
26650 lithium battery general electrical performance
Cycle performance: 2000 times (1C charge /1C discharge, capacity retention rate ≥80%, 100%DOD)
Maximum continuous discharge current: 9.6A
Pulse discharge current: 15A, 5s
Working temperature: Charging: 0°C~55°C; Discharge: -20°C~60°C
Storage temperature: -20°C~45°C
Battery weight: 86g (approx.)
Nickel-cobalt-manganese ternary lithium ion 26650 single section nominal voltage is generally: 3.6V
Nominal capacity: 4500mAh (capacity range 4500-4650mAh)
Ac internal resistance: ≤30mΩ (plus PTC type)
Charging conditions: Cut-off voltage 4.2±0.05V, cut-off current 0.01C. (Note: 0.5C constant current charge to 4.2V, constant voltage charge until current drops to 0.01C cut-off)
Discharge cut-off voltage: 2.75V
Cycle performance: 500 times (1C charge /1C discharge, capacity retention rate ≥70%, 100%DOD)
Maximum continuous discharge current: 13A
Pulse discharge current: 15A, 5s
Working temperature: Charging: 0°C~55°C; Discharge: -20°C~60°C
Storage temperature: -20°C~45°C Battery Weight: 92g (approx.)
Diameter: 26.2mm
Height: 65.6mm
18650 lithium battery and 26650 lithium battery which is good - battery volume comparison
The volume of 26650 lithium battery is larger than that of 18650 lithium battery, their cell height is the same, the cell diameter is different, 26650 lithium battery cell diameter is 26mm, and 18650 lithium battery cell diameter is 18mm.
18650 lithium battery and 26650 lithium battery which is good - battery capacity comparison
Under the same battery material, the battery capacity of 26650 is larger than that of 18650, assuming that the same ternary material 26650 battery is generally about 5200mAh, and the capacity of 18650 battery is mostly about 2600mAh.
18650 lithium battery and 26650 lithium battery which is good -- application environment comparison
18650 lithium batteries are used in lighting lamp batteries, industrial supporting lithium battery packs, power tool batteries, electric bicycle batteries, power lithium battery packs and other aspects, while 26650 lithium batteries are used in integrated solar street lamp lithium battery packs, energy storage stations, solar energy storage batteries and other aspects.
Previous
