When you hear talk about lithium batteries, the word BMS is always mentioned. BMS stands for Battery Management System, but few people know what it is and its function. In this article we’ll explain it to you in a simple way.
What is a lithium battery BMS?
That strange function known as “lithium battery balancing”
Lithium batteries are high-performing devices and offer countless advantages over traditional batteries. They also have a weak point, however: manufacturers are unable to ensure production uniformity from one lithium cell to another.
Although all of their characteristics exceed rated values, the cells present:
- Differences in rated capacity
- Differences in internal resistance
- Differences in self-discharge
With use or, simply, with the passing of time, these differences, even if small, cause the cells inside the battery to go out of balance. This imbalance can lead to a 3% to 6% difference between the cells, depending on the conditions of use and ageing of the lithium battery.