Basic knowledge of lithium battery protection board
NEWS / Basic knowledge of lithium battery protection board
First, the composition of the Protection Plate Lithium Battery -LRB-rechargeable) need protection, is determined by its own characteristics. Due to the material of lithium battery itself, it can not be overcharged, overdischarge, overcurrent, short-circuit and ultra-high temperature charge-discharge, so the lithium-ion component of a lithium-ion battery is always accompanied by a delicate protective plate and a current protector. The protection function of lithium battery is usually accomplished by the cooperation of the protection circuit board and PTC, the Protection Board is composed of electronic circuit, in the environment of -40 ° C to + 85 ° C to accurately monitor the battery voltage and charge and discharge circuit current, real-time control current circuit on and off; PTC in high temperature environment to prevent severe battery damage.
Protection Board usually includes control IC, MOS switch, resistor, capacitor and auxiliary device NTC, ID memory, etc. . One control IC, in all normal conditions control MOS switch on, so that the cell and external circuit communication, and when the cell voltage or circuit current exceeds the specified value, it immediately (tens of milliseconds) control MOS switch off, protect the safety of the cell. NTC stands for Negative temperature coefficient. When ambient temperature rises, the resistance value decreases.
The electrical equipment or charging equipment will react and control the internal interruption to stop charging and discharging. ID memory is usually a single-line interface memory, ID is the abbreviation of Identification that identity means, storage battery type, production date and other information. Can play a product traceability and application restrictions. 2. The main function of the protection board generally requires that the Control (IC) detects the working current and voltage of the Control cell and the charge and discharge circuit at -25 ° c-85 ° C, and the C-MOS switch is turned on under all normal conditions, when the voltage of the cell or the working current in the circuit exceeds the preset value of the comparison circuit in the control IC, in 15-30ms (different control IC and C-MOS have different response time) , the CMOS switch off, that is, the discharge or charge circuit of the cell is turned off to ensure the safety of the user and the cell.