The protection of lithium iron phosphate batteries is determined by its own characteristics. Because the material of the lithium-ion battery itself determines that it cannot be overcharged, over-discharged, over-current, short-circuited, and ultra-high temperature charging and discharging, the lithium-ion battery package will always appear with an exquisite protection board and a current fuse.

The protection function of 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 voltage of the cell at all times under the environment of -40℃ to +85℃. The current of the charging and discharging circuit can be controlled in time to turn on and off the current circuit; the PTC will guard against severe damage to the battery in a high temperature environment.

1. The characteristic part of the matrix

1. Open-circuit voltage detection: After measuring the loaded voltage, can the MOS tube be turned on normally?

2. 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 measurement of the chip (the working crystal frequency of the chip)

5. On-resistance measurement (MOS tube and FUSE resistance measurement)

6. Identification resistance-IDR measurement;

7. Thermal Tuning Resistance--THR

8. Static power consumption in normal state, current sleep static power consumption

9. The quiescent power consumption current in the 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, generally it is not recommended to only measure POV, because the POV of the total group is protected, It does not mean that every section can be protected. If a certain section is not protected, 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 that of CUV, CUV has CUV measurement, but PUV may not be measured, and the reason is the same as POV:

12. Charging overcurrent protection (OCCHG)

13. The upper and lower limits of the protection value: the current is too small, it is related to the charging time, and the current is too large, it is related to the battery life

2. Partial detection of protection characteristics of lithium iron phosphate batteries

1. Single-cell battery overcharge protection detection (COV)

2. The lower limit of protection: 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 or not, which affects the safety of the battery

4. The upper and lower limits of the protection delay time: Is the protection delay time within the design range?

5. Recovery detection: After protection, whether it can be recovered depends on whether the battery can be used again.

The protection board is necessary for the lithium iron phosphate battery pack. The lithium ion battery must be used together with the protection board to ensure the safety and reliability of the entire system! ACEY NEW ENERGY provides BMS board tester, can test the performance of the battery BMS board to ensure the role of the BMS board in the battery pack.