Safety Devices for Lithium Battery: What You Need to Know

Author: Polinovel    |    September 2, 2022
Battery Safety


Safety is our primary concern while using lithium batteries. How much do you know about the safety devices in lithium batteries?

In this article, we will talk about safety vents and BMS to see how they keep lithium batteries safe.

Part 1. Safety Vent

The safety vent is the most important explosion-proof device in lithium battery cells. Whether it is a cylindrical cell or a square cell, there will be this safety device.

When the pressure in the cell reaches the upper limit, the safety vent will open to discharge the internal gas to avoid explosion and fire caused by excessive pressure. The reasons for the increase of internal pressure are generally overcharging, high temperature, short circuits, etc. And for different battery cells, the limit of the pressure may be different.

Once the safety vent is opened, it cannot be restored, and the cell cannot work. But you don’t need to worry. As long as you use the battery properly according to the specification sheet provided, it is rare that the safety vent opens and the battery becomes unusable.

Part 2. Battery Management System

A battery management system, also BMS, can collect, process, and store information during the operation of the lithium battery in real time, and exchange the information with external devices such as controllers.

The BMS can monitor the state of charge (SOC) of lithium batteries, ensuring that the SOC is maintained within a reasonable range and preventing damage to the batteries due to overcharge or over-discharge.

The BMS balances the charge among cells, ensuring that the cells function at maximum capacity. More importantly, the BMS can detect any dangerous situations and then shut down the battery.


You can use lithium batteries securely for they have a safety vent and BMS to guarantee safety. If you don’t know how to choose a safe lithium battery, you can contact Polinovel to give you detailed and suitable battery solutions.

The LiFePO4 batteries from Polinovel have safety vents and intelligent BMS, which can meet your requirements for high safety. And the Polinovel LFP batteries have many powerful functions available for you, such as Bluetooth monitoring, LCD displaying, etc. You can have a wonderful experience with Polinovel lithium batteries.

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