1、Definition of 26650 lithium battery
26650 lithium battery is a type of cylindrical lithium battery specifications, applicable to special equipment, medical equipment, instruments, electric tools, transportation and logistics, security monitoring, exploration and mapping, etc. 26650 lithium battery size: diameter of 26mm, length of 65mm.
2, 26650 lithium battery advantages
26650 lithium battery energy density, low self-discharge rate, stable charging and discharging performance, no memory effect, heat does not decompose, high safety performance, long life cycle, high voltage, can be used in series or parallel to form 26650 lithium battery packs, environmental protection and non-polluting.
3, single 26650 lithium batteries
26650 lithium batteries are mainly divided into ternary materials and lithium iron phosphate materials.
Voltage
INR26650 lithium battery nominal voltage 3.6V, fully charged voltage 4.2V, discharge cut-off voltage: 3.0V
IFR26650 lithium battery nominal voltage 3.2V, fully charged voltage 3.65V, discharge cut-off voltage: 2.0V
Capacity
IFR26650 lithium battery capacity capacity includes 2800mAh, 3000mAh, 3200mAh, 3400mAh, 3600mAh, 3800mAh, 4000mAh and other capacity segments.
INR26650 lithium battery capacity is generally relatively more in 4500mAh, 5000mAh, 5500mAh, 6000mAh.
26650 lithium battery cathode material
26650 lithium battery cathode materials are lithium cobaltate, lithium manganate, nickel-cobalt aluminum ternary, nickel-cobalt manganese ternary, lithium iron phosphate, etc. The material system determines the battery’s operating voltage and unit capacity and other characteristics of the battery, each material manufacturers and battery cell manufacturers through the material doping of special materials, cladding technology, manufacturing process improvements to improve the overall battery voltage and capacity and other indicators, usually a variety of materials, operating voltage and theoretical gram capacity, respectively. The working voltage and theoretical gram capacity of various materials are as follows:
Lithium Cobaltate 3.6V Theoretical capacity is 274mAh/g.
Lithium manganate 3.7V Theoretical capacity is 148mAh/g.
Ternary material 3.65V theoretical capacity is 278mAh/g
Lithium iron phosphate 3.2V Theoretical capacity 170mAh/g
The various materials themselves will determine the cycle life of the battery, and the manufacturing level of the battery manufacturer will also affect the life.
Advantages of 26650 lithium iron phosphate battery
High energy density: theoretical specific capacity of 170mAh/g, actual specific capacity ≥ 140 mAh/g (0.2C, 25°C);
High safety: the safest lithium-ion battery cathode material at present;
Non-pollution: does not contain any heavy metal elements that are harmful to human body;
Long cycle life: under the condition of 100% DOD, it can be charged and discharged more than 2000 times;
Fast charging performance: lithium batteries with lithium iron phosphate cathode material can be charged using a large multiplier.
Item Lithium cobalt cobalt nickel manganese (ternary) lithium manganese manganese lithium iron phosphate
(g/cm3) 2.8~3.0 2.0~2.3 2.2~2.4 1.0~1.4
Gram capacity(mAh/g) 135~140 140~180 90~100 130~140
Voltage plateau(V) 3.7 3.6 3.7 3.2
Cycling performance ≥500 times ≥500 times ≥300 times ≥2000 times
Safety performance Poor Better Good Excellent
Applicable fields Small and medium-sized batteries Small batteries/small power batteries Power batteries, low-cost batteries Power batteries/super-large capacity power supplies
18650 VS 26650
Compared with traditional 18650, 26650 Li-ion battery has a larger capacity under the same material system, with 52% less number of cells compared with 18650. This means that the complexity of the battery management system, the number of metal structural parts, the volume occupied by the battery, and the cost of the battery system can be greatly reduced for the same capacity of the power battery.
What is the difference between 18650 lithium battery and 26650 lithium battery?
The rated capacity is different: IFR 26650 lithium batteries have a rated capacity of 3000-5000mAh, while IFR 18650 lithium batteries have a rated capacity of 2200~3200mAh.
The size of the two batteries is different: the diameter of IFR26650 is 26mm, the diameter of IFR18650 is 18mm.
The reference quality is different: the yield test mass of IFR26650 lithium battery is 94 grams, and the yield test mass of IFR18650 lithium battery is 45 grams.
Battery capacity is different; the battery capacity of 26650 under the same battery material is larger than that of 18650, assuming that the same ternary material 26650 battery is generally about 5200mAh, while the capacity of 18650 battery is mostly about 2600mAh.
Application environment is different; 18650 lithium batteries are used in lighting batteries, industrial supporting lithium battery packs, electric tool batteries, electric bicycle batteries, power lithium battery packs, etc., while 26650 lithium batteries are used in the energy storage base station, solar energy storage batteries, etc. more.
Difference in range time 26650 must be larger than 18650 volume than some, so there is more space to fill the material, to achieve a greater capacity, the current capacity of 18650 2200mAh, 2600mAh, 3100mAh, etc., and 26650 capacity can be done to 4000mAh, 4200mAh, 4500mAh, the range time will be longer!
Post time: Mar-11-2025
