Parameters and advantages and disadvantages of 26650 lithium battery.
26650 lithium battery is a type and specification of cylindrical lithium battery. Used in the fields of electric tools, lighting, wind and solar energy storage, electric vehicles, toys, instruments and meters, UPS backup power supply, communication equipment, medical equipment, and military lighting. The definition of its model is: 26650 type, which refers to a cylindrical battery with a diameter of 26mm and a length of 65mm. Generally used to refer to lithium batteries, including lithium primary batteries and lithium-ion batteries. Common lithium batteries made of useful nickel cobalt manganese cathode materials and lithium iron phosphate materials - INR26650-3.6V-4500mAh IFR26650-3.2V-3200mAh。
Relevant parameters of 26650 lithium battery
Cycle performance: 2000 cycles (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: 86 g (approximately)
The nominal voltage of a nickel cobalt manganese ternary lithium ion 26650 per cell is generally 3.6V
Nominal capacity: 4500mAh (capacity range 4500-4650mAh)
Communication internal resistance: ≤ 30m Ω (with PTC type)
Charging conditions: cut-off voltage of 4.2 ± 0.05V, cut-off current of 0.01C. (Note: Charge at a constant current of 0.5C to 4.2V, and charge at a constant voltage until the current drops to 0.01C before stopping)
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: 92 g (approximately)
Diameter: 26.2mm
Height: 65.6mm
Advantages of 26650 lithium battery
1. 26650 lithium batteries have overcharge performance: After standard charging, the initial state of the battery is measured. When the battery is in normal condition, it is charged to 10.0V with a current of 3C, and then switched to constant voltage charging until the cut-off current is 0.01C, at which point it terminates. Observe the appearance changes of the battery. Result: No fire, no explosion.
2. 26650 lithium batteries have over discharge performance: After standard charging, measure the initial state of the battery. When the battery is in normal condition, discharge it to 0 V at 0.5C. Observe the changes in the appearance of the battery. Result: No fire, no explosion.
3. Difficult to short-circuit externally: After standard charging of the battery, measure its initial state and place it in an explosion-proof cover to directly short-circuit its positive and negative poles (total resistance of the circuit is not greater than 50m Ω). The test ends when the battery temperature drops to about 10 ℃ below the peak temperature. Observe the temperature and appearance changes of the battery. Result: No fire, no explosion.
Disadvantages of 26650 lithium battery
Because the 26650 lithium battery has a smaller usage range and its performance status has been replaced by the 18650 lithium battery, many manufacturers no longer produce this battery.
Which is better, 26650 lithium battery or 18650 lithium battery? This cannot be compared all at once, it depends on what field you want to use it in. For example, 18650 lithium batteries are widely used in lighting fixture batteries, industrial supporting lithium battery packs, power tool batteries, electric bicycle batteries, power lithium battery packs, etc., while 26650 lithium batteries are widely used in integrated solar street light lithium battery packs, energy storage stations, solar energy storage batteries, etc.
