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First, the composition of the protection board
Lithium battery (rechargeable) is the need for protection, is determined by its own characteristics. Due to the lithium battery itself.
It is determined that it can not be overcharge, over discharge, overcurrent, short circuit and ultra-high temperature charge and discharge, so lithium battery lithium components always follow the specified value, it immediately (tens of milliseconds) control MOS switch off, protect the battery Safety. NTC is the abbreviation of Negative temperature coefficient, which means that the negative temperature coefficient, the ambient temperature increases, the resistance is reduced, the use of electrical equipment or charging equipment in a timely manner to control the internal interrupt and stop charging and discharging.

Second, the main role of the protection board
General requirements at -25 ℃ ~ 85 ℃ Control (IC) detection control battery voltage and charge and discharge circuit operating current, voltage, in all normal circumstances C-MOS switch conduction, so that the battery and the protection circuit board in the Normal working state, and when the battery voltage or circuit in the working current exceeds the control circuit in the circuit default value, in 15 ~ 30ms (different control IC and C-MOS have different response time), the CMOS off , That is, close the battery discharge or charging circuit, to ensure the safety of users and batteries.