What's the difference between 18650 lithium battery and 26650 lithium battery?
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2023/05/17 11:04:58
Lithium battery (Li-ion, LithiumIonBattery) : Lithium ion battery has the advantages of light weight, large capacity, no memory effect, so it has been widely used. Many digital devices have adopted lithium ion battery as a power supply, although its price is relatively expensive. The energy density of lithium ion battery is very high, its capacity is the same weight of nickel metal hydride battery 1.5~2 times, and has a very low self-discharge rate. In addition, lithium-ion batteries have almost no "memory effect" and no toxic substances, which are also important reasons for their widespread use. There are many kinds of lithium batteries. This paper compares 18650 lithium batteries and 26650 lithium batteries.
18650 Lithium battery and 26650 lithium battery which good -- 18650 lithium battery introduction
The 18650 is a standard lithium-ion battery model adopted by SONY Corporation of Japan, the originator of lithium-ion batteries, in order to save costs. 18 represents a diameter of 18mm, 65 represents a length of 65mm, and 0 represents a cylindrical battery. Generally, 18650 batteries are used more in industry and less in civil use. It is common to use more batteries in notebooks and high-grade flashlights.
18650 lithium battery advantages
1, large capacity 18650 lithium battery capacity 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 is casually can break through 5000mah.
2, long life 18650 lithium battery service life is very long, normal use cycle life can reach 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, after RoHS trademark certification; All kinds of safety performance in one go, the number of cycles is more than 500 times; High temperature resistance performance, 65 degrees of power down efficiency reaches 100%. In order to prevent short circuit of the battery, the positive and negative electrodes of the 18650 lithium battery are separated. So the likelihood of it short-circuiting has been reduced to the extreme. You can add a protective plate to avoid overcharging the battery, which can also extend the life of the battery.
4, high voltage 18650 lithium battery voltage is generally 3.6V, 3.8V and 4.2V, far higher than nickel cadmium and nickel metal hydride battery voltage of 1.2V.
5, no memory effect in charge before the remaining power will not have to empty, easy to use.
6. Small internal resistance: the internal resistance of the polymer cell is smaller than that of the general liquid cell. The internal resistance of the domestic polymer cell can even be below 35mΩ, which greatly reduces the power consumption of the battery and extends the standby time of the mobile phone, and can fully reach the level of international standards. Lithium polymer, which supports high discharge currents, is ideal for remote control models, making it the most promising alternative to NIMH batteries.
7. 18650 lithium battery pack can be synthesized in series or combined
8, use a wide range of laptop computers, walkie-talkies, portable DVD, instruments, audio equipment, model aircraft, toys, cameras, digital cameras and other electronic equipment
18650 Lithium battery disadvantages
The biggest disadvantage of 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 shortcoming compared with other polymer lithium battery and other lithium batteries can be customized and changeable size. And relative to some specified battery specifications of the product has become an advantage.
18650 lithium battery prone to short circuit or explosion, is also relative to the polymer lithium battery, if the relative general battery, this shortcoming is not so obvious.
The production of 18650 lithium battery requires a protective 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 material used for lithium batteries is basically lithium cobalt acid material, and lithium cobalt acid material of lithium batteries can not discharge large current, poor safety.
The production conditions of 18650 lithium battery are very demanding. Compared with ordinary battery production, 18650 lithium battery requires very high production conditions, which undoubtedly increases the production cost.
18650 lithium battery and 26650 lithium battery which good -- 26650 lithium battery introduction
26650 lithium battery is a type specification of cylindrical lithium battery. Used for power tools, lighting, landscape energy storage, electric vehicles, toys, instruments, ups backup power supply, communication equipment, medical equipment and military lamp fields. The definition of its model is: 26650 type, that is, the diameter of the battery is 26mm, the length is 65mm, cylindrical type battery.
General electrical performance of 26650 lithium battery
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
Operating 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: Charge at 0.5C constant current to 4.2V, charge at constant voltage until current drops to 0.01C)
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
Operating temperature: Charging: 0°C~55°C; Discharge: -20°C~60°C
Storage temperature: -20°C~45°C Battery weight: 92g (about)
Diameter: 26.2mm
Height: 65.6mm
18650 lithium battery and 26650 lithium battery which good - battery volume comparison
The volume of 26650 lithium battery is larger than that of 18650 lithium battery. Their cell height is the same, and the cell diameter is different. 26650 lithium battery cell diameter is 26mm, while 18650 lithium battery cell diameter is 18mm.
18650 lithium battery and 26650 lithium battery which good - battery capacity comparison
The same battery material under the 26650 battery capacity than 18650 battery capacity is larger, assuming that the same three-way material 26650 battery is generally about 5200mAh, and the capacity of 18650 battery is about 2600mAh.
18650 lithium battery and 26650 lithium battery which good -- application environment comparison
18650 lithium battery is used in lighting lamp battery, industrial supporting lithium battery, electric tool battery, electric bicycle battery, power lithium battery and other aspects more, and 26650 lithium battery is used in integrated solar street lamp lithium battery, energy storage station, solar energy storage battery and other aspects more.
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