Why use a protective plate for lithium iron phosphate battery packs

The reason why the lithium iron phosphate battery needs to be protected is determined by its own characteristics. Since the material of the lithium battery itself determines that it cannot be overcharged, overdischarged, overcurrent, short-circuited, and ultra-high temperature charging and discharging, the lithium battery package will always appear with a delicate protection board and a current fuse. The protection function of the lithium iron phosphate battery pack is usually completed by the protection circuit board and current devices such as PTC. The protection board is composed of electronic circuits, which can accurately monitor the voltage and charge of the battery cell at all times under the environment of -40℃ to +85℃. Discharge the current of the loop, and control the on and off of the current loop in time; PTC guards against severe damage to the battery in a high temperature environment. 1. Matrix characteristics 1. Open-circuit voltage detection: After measuring the applied voltage, whether the MOS tube can be turned on normally 2. On-load voltage detection: Measure the load capacity of the protection board to reflect the protection DC impedance 3. VCC voltage measurement ( Is the working voltage of the chip normal? 4. The working frequency of the chip is measured (the working crystal frequency of the chip) 5. The on-resistance measurement (MOS tube and FUSE resistance measurement) 6. The identification resistance-IDR measurement; 7. Thermistor Tun resistance--THR 8. Static power consumption current in normal state u0026 sleep static power consumption 9. Static power consumption current in off state 10. PACK battery overvoltage protection detection (POV) protection value, protection delay time, recovery value, recovery Time (If COV is measured, POV does not need to be measured, it is generally not recommended to measure only POV, because even if the POV of the general group is protected, it does not mean that every section can be protected. In case a certain section is not protected, then It is very dangerous. 11. PACK battery low-voltage protection detection (PUV); protection value, protection delay time, recovery value, recovery time: the principle is the same as CUV, CUV has CUV measurement, but PUV may not be measured, and the reason is the same as POV: 12. Protection (OCCHG) 13. The upper and lower limits of the protection value: the current is too small, which is related to the charging time, and the current is too large, which is related to the battery life. 2. Lithium iron phosphate battery protection characteristics part detection 1. Single battery overcharge protection detection (COV) 2. Protection lower limit: detect whether the lithium iron phosphate battery protection board is protected in advance, which affects the battery capacity value 3. Protection upper limit: detect whether the protection board is protected, which affects the safety of the battery 4. The upper and lower limits of the protection delay time: the protection delay time is It is not in the design scope. 5. Recovery detection: whether it can be recovered after protection is related to whether the battery can be used again. The protection board is necessary for lithium iron phosphate battery packs, and the lithium battery must be used together with the protection board to ensure The safety and reliability of the entire system! Statement: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete the previous one: Detailed explanation of lithium iron phosphate battery dismantling and recycling strategy