Do LiFePO4 batteries need a BMS?

However, without a BMS, these batteries are vulnerable to issues like overcharging, over-discharging, and temperature extremes, which can shorten their lifespan or even cause damage. A BMS ensures that each cell in a LiFePO4 battery operates within safe parameters, protecting against potentially hazardous situations.

What is a battery management system (BMS)?

A Battery Management System (BMS) is an intelligent electronic system that monitors and controls the operation of a battery pack, which can be called the “brain” of the battery. The BMS is responsible for ensuring the safety, efficiency, and longevity of the battery by managing crucial factors like voltage, current, and temperature.

What voltage should a BMS be rated for?

In any case, the BMS must always be rated for the same voltage as your battery pack (12V, 24V, or 48V). Let’s say your battery pack has a 100Ah capacity and a 0.2C C-rate. This means the battery can safely discharge at 20% of its capacity. So, the BMS needs to handle at least: 100Ah x 0.2C = 20A max discharge, sustained for 5 hours.

What if a battery has a 100A BMS?

For example, if a battery is equipped with a 100A BMS, this means the maximum allowable current is 100 amps. If the current exceeds this limit say, it reaches to 200A, the BMS will automatically disconnect the battery to prevent overcurrent damage and protect both the battery and connected devices.