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Design and maintenance of lithium battery protection board

by:dcfpower     2021-03-21

Because the objective shortcomings of lithium batteries hinder the use of functions, the function of lithium battery protection board is to make up for some of the shortcomings of lithium batteries. Because the material of the lithium battery pack itself determines that it cannot be overcharged, over-discharged, over-current, short-circuited, and ultra-high temperature charging and discharging, a battery protection board is needed to prevent and protect it.

The design function of the lithium battery pack protection board includes the following points:

1. Overcharge detection voltage: Under normal conditions, Vdd gradually increases to the CO terminal from high level to change The voltage between VDD and VSS at low level.

2. Overcharge release voltage: In the charging state, Vdd gradually decreases to the voltage between VDD and VSS when the CO terminal changes from low level to high level.

3. Overdischarge detection voltage: Under normal conditions, Vdd gradually decreases to the voltage between VDD and VSS when the DO terminal changes from high level to low level.

4. Overdischarge release voltage: In the overdischarge state, Vdd gradually rises to the voltage between VDD and VSS when the DO terminal changes from low level to high level.

5. Overcurrent 1 detection voltage: In the normal state, VM gradually rises to the voltage between VM and VSS when DO changes from high level to low level.

6. Overcurrent 2 detection voltage: In the normal state, VM rises from OV at a speed of 1ms or more and 4ms or less to the voltage between VM and VSS when the DO terminal changes from high level to low level .

7. Load short-circuit detection voltage: In the normal state, VM starts from OV and rises to the voltage between VM and VSS when the DO terminal changes from high to low at a speed of 1μS or more and 50μS or less.

8. Charger detection voltage: In the over-discharge state, VM gradually decreases with OV to the voltage between VM-VSS when DO changes from low level to high level.

9. Current consumption during normal operation: Under normal conditions, the current flowing through the VDD pin (IDD) is the current consumption during normal operation.

10. Over-discharge current consumption: In the discharging state, the current (IDD) flowing through the VDD terminal is the over-current discharge current consumption.

Relevant battery protection board knowledge article:

Introduction to the lithium battery pack protection board

The chemistry of the battery caused the decline of the battery How to properly use the equalizer to charge the battery


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