18650 lithium battery in the 18650 these numbers, representing the appearance of the size: where 18 means the diameter of 18mm, 65 means the length of 65mm, 0 means for the cylindrical battery. It is a standard lithium-ion battery type set by SONY in Japan to save cost, called 18650 lithium battery. 18650 lithium battery pack usually consists of three parts: 18650 cell, protection board (usually called PCBA) and shell structural parts. The best 18650 Li-ion battery pack should choose the best of the following three components.
1. Use high quality 18650 cells
The best 18650 Li-ion battery pack should be composed of first-tier brand cells, with mainstream capacities ranging from 1800mAh to 3500mAh. single cells undergo a series of safety tests and performance tests.
2. Multi-functional protection circuit board (PCBA)
The core component of the Li-ion battery protection board is the protection IC. The main materials that make up the protection board are PCB, magnetic field effect tube (MOS tube), NTC, PTC, capacitor, resistor, diode, triode, etc.
Overcharge protection: When the voltage of a string of the battery pack is greater than the (overvoltage) maximum value and the protection delay is reached, the IC controls the CMOS to shut down the charging circuit.
Over-discharge protection: When the voltage of one string of the battery pack is less than the (under-voltage) maximum value, and the protection delay is reached, the IC controls the DMOS to shut down the discharge point circuit.
Over-current and short-circuit protection: When the battery pack P+ and P- output currents exceed the over-current/short-circuit current value and the over-current/short-circuit delay is reached, the control circuit controls the discharge DMOS to shut down the discharge circuit and stop discharging.
High and low temperature protection: When the temperature sensor reaches the temperature threshold and the protection delay is reached, the control circuit controls the shutdown of the charging and discharging MOS tube to stop charging and discharging.
The Li-ion battery protection board also has functions such as power detection, balance display, battery working status display and communication remote control.
3. Shell structural parts
According to the demand of electric apparatus, design the shell structure to match it, usually with plastic shell, hardware shell, simple PVC heat shrink, etc.
4. Exquisite lithium battery PACK technology
For 18650 lithium battery pack, superb PACK capability is crucial to have advanced equipment, skilled technical workers, mature management mode and strict production requirements in order to ensure that no omission will occur in the important aspects of 18650 lithium battery pack such as welding, testing, aging, pre-shipment testing, etc. and produce the best 18650 lithium battery pack.