How does the lithium battery protection board perform short-circuit protection

by:CTECHi     2021-07-16

Lithium battery protection board must be familiar to everyone, and everyone understands its function, which is to protect lithium battery packs or single-cell lithium batteries from overcharge, overdischarge, overcharge, overcurrent, equalization and short circuit protection. All these have allowed us to avoid some unnecessary losses. Today, Chuangfa Technology Co., Ltd. will let everyone know how the lithium battery protection board protects the lithium battery from short circuit?

First of all, the lithium battery protection board acts as a dam. When the current flows through the lithium battery protection board, it will be output. Therefore, during the external discharge of the lithium battery protection board, There are two electronic switches in the MOS tube, but this switch is not a complete mechanical switch, but as two resistors in disguise, but the resistance of this resistor is not very large. Generally we call these two resistors The internal resistance is turned on, but the actual voltage on the G pole is what controls the size of the two internal resistances. When the voltage of the G pole is greater than 1V, the resistance value of the turn-on internal resistance will become very small, almost equivalent to a wire. When the voltage of the G pole is less than 0.6V, the resistance value of the two on-state internal resistances will become very large, forming an open circuit in disguised form. In general, a short circuit will increase the instantaneous current value, and if the current is too large, the voltage of the load will be too large, and thus the voltage of the G pole will be reduced. At this time, the two conduction internal resistances are as mentioned above. Yes, the resistance will become very large, thus realizing short-circuit protection.

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