Battery Technical Info, Industry News

What is a BMS Battery Management System?

lithium battery BMS

BMS is an Electric Vehicle Battery Management System, which is an important link between on-board power battery and electric vehicle. BMS collects, processes and stores important information in the battery pack operation process in real time, and exchanges information with external equipment such as vehicle controller to solve key problems in the lithium battery system such as safety, availability, ease of use and service life. The main function is to improve the utilization rate of the battery, prevent the battery from over-charging and over-discharging, extend the service life of the battery, and monitor the state of the battery. In general, it is a system for managing, controlling, and using battery packs. All of SmartPropel lithium batteries use top A grade cells with high quality BMS multiple protection.

BMS image

What is a BMS system?

1.Limited use range of lithium-ion battery.

For lithium-ion batteries, the ideal range of work is very limited, not broad. Therefore, Li-ion batteries must be managed in the application process, especially in the application scenario of power batteries.

2.Safety issues

Distortion, Swelling, Flaming, Explosion

Battery BMS

Over-voltage (overcharge), over-current and over-temperature will bring a series of safety risks to lithium-ion batteries

3.Performance management

The external characteristics of lithium battery have a great relationship with its own state (SOC/SOH/ temperature) and ambient temperature.

4.Life time

Temperature factor, Voltage factor (SOC & ∆SOC), Current factor

High SOC and high temperature environment will aggravate the irreversible capacity loss of the battery.


Capacity, Impedance, Self-discharge rate

It is almost impossible for all cells in a battery pack to be exactly the same, which means that there are inconsistent operating conditions (internal resistance/heat /SOC interval) and different aging rates between cells, so balanced management is required.

What is the main mission of BMS?

Main tasks of BMS:

Battery condition monitoring, Battery state analysis, Battery safety protection, Energy control management, Battery Information Management.

BMS main task 1

BMS needs to avoid excessive abuse of power electricity to ensure safe, reliable, efficient and long life operation of power batteries.Most of our electric vehicle lithium battery, such as 72V 200Ah battery is assembled with high quality BMS, which can have the Can Communication function.

SmartPropel Original Writer: Michelle