Analysis of the composition and important functions of lithium battery protection board

The composition and important functions of the protection board 1. The composition of the protection board The lithium battery (rechargeable) needs to be protected due to its characteristics. Because the material of the lithium battery itself determines that it cannot be overcharged, over-discharged, over-current, short-circuited, and ultra-high temperature charging and discharging, the lithium battery package of the lithium battery always has an exquisite protection board and current protector. The protection function of the lithium battery is usually completed by the protection circuit board and the PTC. The protection board is composed of electronic circuits, which can accurately monitor the voltage of the battery and the current of the charging and discharging circuit within the range of -40°C to +85°C, and can control the on and off of the current circuit in real time. PTC prevents serious damage to the battery at high temperatures. The protection board usually includes control IC, MOS switch, resistor, capacitor and auxiliary device NTC, ID memory and so on. Among them, the control IC controls the conduction of the MOS switch under all normal conditions, enabling the battery to communicate with the external circuit. When the battery voltage or circuit current exceeds the specified value, it immediately (tens of milliseconds) controls the MOS switch to close to protect the safety of the battery. NTC is the abbreviation for negative temperature coefficient, which means negative temperature coefficient. When the ambient temperature rises, the resistance decreases, and electrical equipment or charging equipment can respond in time, control internal interruptions, and stop charging and discharging. ID memory is usually a single-line interface memory. ID is the abbreviation of identity, which means identity. It stores information such as battery type and processing date. Can take advantage of product traceability and application restrictions. Second, the important use of the protection board is generally required to control (IC) test battery voltage control and the working current and voltage of the charging and discharging circuit at 25℃~85℃. When the C-MOS switch tube under normal conditions is turned on, the battery is normal Working and protecting the circuit board, when the battery voltage or circuit working current exceeds the preset control integrated circuit of the comparison circuit, within 15~30ms (different control integrated circuits and C-MOS have different response times), CMOS is turned off, turned off, or the battery is charged The discharge circuit ensures the safety of the user and the battery. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Why does the battery power of the mobile phone battery decrease after a period of time?