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What is a battery protection circuit?
The circuit monitors the voltage of a Li-Ion battery and disconnects the load to protect the battery from deep discharge when the battery voltage drops below the lockout threshold. In a discharged condition, current to the protection circuitry continuously discharges the battery.
What is the difference between protected and unprotected battery?
As the difference is evident from definitions above, unprotected battery is raw and has no monitoring circuit that protects against hazards, while protected batteries have circuit installed into the cell packaging which controls the batteries’ temperature and prevents inflations, over-heating, etc.
How does a Li ion battery protection circuit work?
Li-Ion Battery Undervoltage Lockout Figure 1 shows an ultralow power, precision undervoltage-lockout circuit. The circuit monitors the voltage of a Li-Ion battery and disconnects the load to protect the battery from deep discharge when the battery voltage drops below the lockout threshold.
Why do you need a protection circuit on a lithium battery?
The protection is in the form of a circuit board which is added to lithium batteries before being wrapped with the distributors label. Its function is to make certain that the rechargeable battery that it’s serving, never over-charges or DIS-charges below a preset level.
What do you need to know about protection circuitry?
For specifics on each battery you must look at the datasheet to know what the safe voltages, currents and temperatures are – they can vary from cell to cell. For the first 3 items, a circuit board attached to the battery can monitor the battery voltage and the current going out. These are often referred to simply as protection circuits.
What should I look for when charging a battery?
There are five main things to watch for when charging and using batteries: Do not charge them above their maximum safe voltage (say 4.2V) – usually taken care of by any on-cell protection circuit Do not discharge them below their minimum safe voltage (say 3.0V) – usually taken care of by any on-cell protection circuit