The best sorting method of 26650 lithium battery capacity

An overview of the 26650 lithium batteries

The type 26650, namely battery of the 26 mm diameter, the length of 65 mm, cylindrical shape of the battery.Commonly used to call lithium battery, including lithium battery and lithium ion battery at a time.Common useful nickel cobalt manganese cathode material made of lithium batteries, lithium iron phosphate material - INR26650-3.6 - V - 4500 mAh, IFR26650-3.2 - V - 3200 mAh.

26650 the performance of lithium-ion batteries

Cycle performance: 2000 times (charging 1 c / 1 c discharge, keep the rate of 80% or greater capacity, 100% DOD)

Maximum continuous discharge current: 9.6 A

The pulsed discharge current: 15 a, 5 s

Working temperature: charging: 0 ° C ~ 55 ° C;Discharge: - 20 ° ~ 60 ° C C

Storage temperature: - 20 ° C ~ 45 ° C

The battery weight: 86 g (about)

Nickel cobalt manganese ternary lithium ion 26650 single section is commonly: nominal voltage of 3.6 V

Nominal capacity: 4500 mah capacity (range 4500-4650 mah)

Ac internal resistance: 30 m or less Ω type add (PTC)

Charging conditions: as of 4.2 + / - 0.05 V voltage, cut-off current 0.01 C.(note: 0.5 C constant current charging to 4.2 V, constant voltage charging due to the current 0.01 C)

Discharge cut-off voltage: 2.75 V

Cycle performance: 500 times (charging 1 c / 1 c discharge, keep the rate of 70% or greater capacity, 100% DOD)

Maximum continuous discharge current: 13 a

The pulsed discharge current: 15 a, 5 s

Working temperature: charging: 0 ° C ~ 55 ° C;Discharge: - 20 ° ~ 60 ° C C

Storage temperature: - 20 ° C ~ 45 ° C

The battery weight: 92 g (about)

Diameter: 26.2 mm

Height: 65.6 mm

26650 the safety performance of lithium-ion batteries testing

1, overcharge performance

Battery charging standards, measuring the battery of the initial state, the battery is normal, 3 C current charging to 10.0 V, then turned to constant voltage charging end to the current 0.01 C.Observe the appearance of the battery.

Results: no fire, no explosion

2, discharge performance

After the battery charging standards, measuring the battery status, battery status, normal discharge in 0.5 C to 0 v.Watch battery appearance change.

Results: no fire, no explosion

3, external short circuit

Battery charging standards, measuring the battery of the initial state, placed in a direct short circuit in the explosion-proof cover is negative (line resistance is not more than 50 m Ω), when the battery temperature down to about 10 ℃ lower than the peak temperature when the experiment is over.To observe the temperature of the battery and the appearance change.

Results: no fire, no explosion

4, thermal abuse

After measuring the battery's initial state, battery charging standard, placed in the oven, temperature (5 + 2 ℃)/min rate rose to 130 + 2 ℃ and thermal insulation for 30 min.Watch battery appearance change.

Results: no fire, no explosion

5, fall

After initial test battery capacity, charging standards, measuring the battery of the initial state, will test the battery by the height of 1 m (low level) the location of the vertical and horizontal free fall to the cement ground, down 2 times.

Results: no fire, no explosion

6, heavy impact

A diameter of 15.8 mm steel rods placed in the centre of full battery;Then put the weight of 10 kg of hammer from above 1.0 m high free fall to the battery.

Results: no fire, no explosion

7, extrusion test

Batteries on extrusion equipment between two extrusion surface, cylindrical batteries axis parallel to the extruded surface, gradually increase the pressure to 13 kn, keep pressure for 1 min.

Results: no fire, no explosion

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The best 26650 lithium battery capacity sorting method

6650 lithium battery capacity sorting method is the most authoritative, general battery manufacturer when shipped 26650 lithium batteries, battery capacity sorting, are conducted by each battery manufacturer separation methods and five variety, is now investigating multiple columns26650 battery sorting process, sums up the best batteries sorting method is as follows:

1) which hold 2 min take termination voltage, final voltage < 2.5 V, the ark into the C file scrap directly.

2) 0.5 C (1500 ma) constant exile electricity, voltage limit of 2.0 V, the time limit of 150 min;

3) let stand for 10 min;

4) 0.1 C (300 ma) constant exile electricity, voltage limit 2.0 V, the time limit of 60 min;

5) let stand for 2 min.

6) 0.5 C constant current charging, voltage limit of 3.65 V, the time limit of 150 min;

7) 3.65 V constant voltage charging, the current deadline: 0.05 C (150 ma), 90 min time limit;

8) stand for 2 min.

9) 0.5 C constant exile electric voltage limit 2.0 V, 150 min time limit;

Let stand for 10 min at the 10);

11) 0.1 C constant exile electric voltage limit 2.0 V, the time limit of 60 min;

12) let stand for 2 min.

13) 0.5 C constant current charging, voltage limit 3.65 V, the time limit of 60 min;

China's battery industry are strongly recommended to master 26650 lithium battery capacity sorting process is as follows:

Note: 0.5 nominal capacity C = 0.5 * 0.5 = 0.1 C * nominal capacity C = 0.05 * 0.05 nominal capacity (etc)

Step (work step 2 + 4) for the residual capacity of batteries, step (work step 9 + 11) for the actual capacity.

Self-discharge test method (s) = 2 * (* 0.5 nominal capacity - the residual capacity)/(step (work step 9 + 11) * shelved months)

After the above work step, before the actual capacity and self-discharge batteries with group.Step work after 12 hours, all the open circuit voltage, internal resistance and resistance to voltage distribution groups.

Sorting data processing step should keep working 9,0.5 C (1500 mAh) constant exile electric capacity 3.2 V platform data, use this capacity/work step 9 capacity should be > = 40%, for example: working step 9,0.5 C (1500 mAh) constant exile electric platform 3.2 V = 1800 mAh capacity, work step 9 = 3200 mAh capacity, calculation methods: 1800/3200 = 56%, namely for qualified batteries, such as less than 40%, is the defective batteries

Batteries required shall be carried out in accordance with the chemical composition, let batch (120 PCS) with group, and group requirements: 0.5 + 0.1 C C a capacity of 3000 mAh or voltage is 3.290 V or higher resistance or less 30 milliohm, self-discharge 10% or less.30 mAh first gear capacity, internal resistance plus or minus 2 m Ω, voltage plus or minus 2 mv, self-discharge tolerance + / - 1%.

Self-discharge capacity, internal resistance and heavy check unqualified batteries, according to the standard file withdrawing money.Cannot pair batteries identified the original batch and heavy inspection date according to the inventory standard library.

Batteries capacity affected by temperature.Temperature is lower than 22 degrees Celsius under capacity, temperature compensation will be computed.

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