Lithium battery protection board is the 'core' of lithium battery

by:CTECHi     2021-07-16

With the continuous improvement of people's living standards, the electrical industry is also booming, especially the electric transportation industry is developing the fastest. For the development of the electrical industry, every battery will carry a battery protection board, and the lithium battery protection board Its function is mainly to protect the cells of rechargeable batteries, maintain the safety and stability of the battery during charging and discharging, and play an important role in the performance of the entire battery circuit system. (For example, lithium batteries are generally composed of cells, protective plates, and housing Components, such as mobile phone batteries). Today, the Chinese Chuangfa will learn with everyone that the lithium battery protection board is the 'core' of the lithium battery. What kind of protection function does it have?

1) Overcharge protection function: The overcharge protection function refers to the prohibition of continued charging by the charger when a certain voltage (hereinafter referred to as the overcharge detection voltage) is reached. That is, the MOS tube that controls overcharge is turned off to stop charging.

2) Over-discharge protection function: The over-discharge protection function stops discharging the load when the battery voltage becomes low. The MOS tube that controls the over-discharge is put into the off state, and its discharge is prohibited. This process is just the opposite of the action during overcharge detection.

3) Overcurrent protection function: The overcurrent protection function is to stop discharging the load when a large current is consumed. The purpose of this function is to protect the battery and MOS tube to ensure the safety of the battery in the state. After the over-current detection, the battery will return to the normal state after being disconnected from the load, and can be recharged or discharged.

4) Short-circuit protection function: The principle of short-circuit protection is the same as 3)

<1>Protection IC: It is the core of the protection chip. Judge by sampling battery voltage, issue various commands to control MOS tube, and manage battery cells.

<2>MOS tube: It mainly plays a switch role in the protection board circuit

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