What Is Battery Management System, Types, Working, Types Of BMS, Ratings

Hello guys, welcome back to my blog. In this article, I will discuss what is the battery management system, how does it work, what happens if we don't use battery management system, types of BMS or battery management system, ratings of BMS and lots of things I will discuss here.

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Battery Management System




The battery management system is used for lithium ions batteries to save from four things such as overcharge, over-discharge, balance charging, and short circuit protection. For other batteries such as lead-acid battery and nickel-metal hydride battery, the battery management system is not required because those batteries can handle the overcharge, over-discharge, balance charging, and short circuit protection.

The battery management system does mainly four works such as to protect the batteries from overcharge, over-discharge, unbalance charging, and short circuit. 

What Is Battery Management System, Types, Working, Types Of BMS, Ratings

The above image is of battery management system board which consists of MOSFETS and control IC's. The control IC's will monitor the battery's input and output current, voltage. While doing cut off of batteries the MOSFETS will come to work.

If the battery voltage goes out of safe then the BMS (Battery Management System) will cut off the battery and once the battery becomes stable the BMS will again take power from the battery.



Well, guys, the BMS is required? For small projects, the BMS is not required whereas if you are using for car or e-bike then the battery management system (BMS) is required. The BMS is required for electric cars because the motor draws heavy current. If the motor draws heavy current from the battery then to protect the batteries the battery management (BMS) system is required. 

Connections Of BMS

What Is Battery Management System, Types, Working, Types Of BMS, Ratings


The negative terminal of one battery connected to "B-" and connect batteries in series and the positive terminal of the last battery connect to "B+" as shown in the above figure.

Types of BMS (Battery Management System)



  • The BMS boards are distinguished based on features like Basic BMS provides only overcharge, over current protection and it is recommended for parallel batteries. 
  • The most common BMS we will see in every place. 
  • The advanced BMS is used in cars, laptop batteries because they provide temperature monitoring and real-time clock features.

To buy a BMS(Battery Management System) board check datasheet.

I hope this article may help you all a lot. Thank you for reading.
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