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Cylindrical Lithium Battery

18650 Battery

18650 Battery

18650 battery 3.2V 1500mAh LiFePO4 cells Specification of 18650 battery operation flow Lithium iron phosphate battery is actually a lithium ion battery with lithium iron phosphate as the positive electrode material. For lithium ion battery, the positive electrode data is divided into various...
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18650 battery 3.2V 1500mAh LiFePO4 cells
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Specification of 18650 battery

No.

Item

Standard

Note

1

Standard Capacity

1500mAh

0.5C,( current value of 1500mA at 1C)

2

Capacity Range

1450~1550mAh

0.5C

3

Standard Voltage

3.2 V


4

Alternating Internal Resistance

≤40mΩ


5

Charge Conditions

Cut-off Voltage

3.65±0.05V

constant-current charge to 3.65V at 0.5C,constant voltage charge to stop until 0.01C mA

Cut-off Current

0.01C

6

Max. Charging Current

1.5A


7

Discharge Cut-off Voltage

2.5V

 

8

Standard Discharge Current

0.75A


9

Fast Discharge Current

1.5A


10

Max. Continuous Discharge Current

4.5A


11

Pulse Discharge Current

10A,5s


12

Cycle Characteristic

2000times(100%DOD)

the residual capacity is no less than 80% of rated capacity at 1C rate.

4000 times(80%DOD)

7000 times(50%DOD)

13

Working Temperature

Charge:0°C~55°C Discharge:-20°C~60°C


14

Storage Temperature

-20°C ~ 45°C

Short-term storage (< 3 months)

15

Battery Weight

41 g (Approx.)



图片18.jpg


operation flow
Lithium iron phosphate battery is actually a lithium ion battery with lithium iron phosphate as the positive electrode material. For lithium ion battery, the positive electrode data is divided into various kinds such as lithium cobaltate, lithium manganate, lithium nickelate, ternary data, iron phosphate. Lithium, etc., during which lithium iron phosphate is the most commonly used material in the lithium battery industry. 


The lithium iron phosphate battery is connected by the aluminum foil to the positive electrode of the battery, and the left side is the barrier of the polymer. It separates the positive electrode from the negative electrode, but the lithium ion Li can be started and the electron e- cannot be used. The right side is the negative electrode of the battery composed of carbon. It is connected with the negative pole of the battery. The electrolyte is sealed between the upper and lower ends of the battery. The battery is sealed by a metal casing. When the LiFePO4 battery is charged, the lithium ion Li in the positive electrode is separated from the polymer to the negative electrode. During the discharge process, the negative electrode The lithium ion Li in the middle of the separation is moved to the positive electrode, and the lithium ion battery is named after the lithium ion is moved back and forth during charging and discharging. 


Lithium-ion battery operation principle, when the battery is charged, Li moves from the 010 surface of the lithium iron phosphate crystal to the crystal appearance, and under the effect of the electric field force, enters the electrolyte, passes through the barrier, and then moves to the appearance of the graphite crystal through the electrolyte. Then embedded in the graphite lattice, after lithium ions are deintercalated from lithium iron phosphate, lithium iron phosphate is converted into iron phosphate; when the battery is discharged, Li is deintercalated from the graphite crystal, enters the electrolyte, passes through the barrier, and then passes through the electrolyte. Moved to the appearance of the lithium iron phosphate crystal, and then re-inserted into the crystal lattice of lithium iron phosphate through the 010 surface, and then discharged to the lithium iron phosphate positive electrode through the electric conductor to start discharging. 


In order to align the conduction of the positive and negative electrodes of the lithium iron phosphate battery, it is necessary to participate in the positive and negative electrodes of the battery, so that it can be formed in the activity guess of the battery, and how to end in the process of theoretical depiction and in the theoretical production process. The above three equations also need to describe a series of experiments to verify, establish a mathematical model or establish a curriculum vitae formula, and then these models may be formulated for lithium-ion battery depiction. 


At that time, the domestic lithium-ion battery skills were old enough to have the world's leading level. At that time, the industry was still focusing on lithium-ion batteries with lithium iron phosphate as the positive electrode. Many countries have developed new lithium-ion battery materials, only At that time, there was no large-scale production. Some scholars pointed out that at least within 10, the lithium iron phosphate cathode data is an open mainstream industry.

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