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Cell protection can be external to the battery and this is one of the of the prime functions of the Battery Management System.

High power cells can be particularly dangerous. They contain large amounts of energy which, if released in an uncontrolled way through a short circuit or physical damage, can have catastrophic consequences. In the case of short circuits, currents of hundreds of amps can build up in microseconds and protection circuits must be very fast acting to prevent this.

Different applications and different cell chemistries require different degrees of protection. Lithium batteries in particular need special protection and control circuits to keep them within their predefined voltage, current and temperature operating limits. Furthermore, the consequences of failure of a Lithium cell could be quite serious, possibly resulting in an explosion or fire. Cell protection is therefore indispensable in Lithium batteries. The following discussion illustrates some of the principles involved.

In general cell protection should address the following undesirable events or conditions:

►Voltage: Total voltage in the package, voltage of a single cell, minimum and maximum cell voltages

►Temperature: Average temperature, cooling inlet temperature, cooling outlet temperature, temperature of each cell

►Charging state or discharge intensity: The charge levels of the batteries

►Healthiness: The soundness of the package or any cell

►Current: Input and output currents of batteries during charge / discharge

• Excessive current during charging or discharging.

• Short circuit

• Over voltage - Overcharging

• Under voltage - Exceeding preset depth of discharge (DOD) limits

• High ambient temperature

• Overheating - Exceeding the cell temperature limit

• Pressure build up inside the cell

• System isolation in case of an accident

The purpose of cell protection is to provide the necessary monitoring and control to protect the cells from out of tolerance ambient or operating conditions and to protect the user from the consequences of battery failures.

Ensures that the voltage values of each cell that composes the battery pack are balanced in order to maximize the capacity of the batteries and prevent overcharging while charging. In case of overvoltage or undervoltage occurring in any cell and the voltage balances deteriorate, the system intervenes and the system enters the cutting.

Heat-sensitive and temperature control mechanism ensures Li-ion batteries operate within a safe range. 

Imported battery cells are equipped with PTC to effectively control current and provide protection when temperature and current exceed the maximum limit

Monitors output current and shuts off when current exceeds the maximum limit to protect the device. 

OVP circuit prevents voltage surges from damaging the device. 

Technology is adopted to prevent overcharging and over-discharging from damaging the Li-ion batteries. 

Technology is adopted to prevent overcharging and over-discharging from damaging the Li-ion batteries.