Features of lithium batteries

Lithium batteries - certainly have advantages over lead-acid batteries. Among the advantages I would like to highlight:

  • No memory effect;
  • Higher energy density per unit mass;
  • High charge rate.

But along with the advantages of lithium batteries, there are also disadvantages. Lithium batteries, so to speak, are very delicate and very demanding on operating conditions. They are contraindicated:

  • High currents;
  • Voltage drops;
  • Short circuits;
  • Recharge;
  • Deep discharge.

For example, overcharging a battery can cause a cell to short out. This is due to the stable metal bonds between the cathode and anodes in the cell. Which leads, at a minimum, to the failure of: the cell, the battery as a whole, the charger or the charging circuits of the UPS / Inverter. And as a maximum, overcharging can lead to fire or explosion.

BMS functionality of protection boards

To avoid such situations, during the operation of lithium batteries, it is necessary to constantly monitor the currents and voltages of the charge / discharge of the battery. A person cannot keep track of everything. To solve these problems, the BMS protection module was developed.

BMS (Battery Management System) - battery management system (protection board, protection system ...). Consider the tasks solved by the BMS system:

  • Control of the battery charging process (current, voltage);
  • Control of the battery discharge process (current, voltage);
  • Battery protection (against short circuit, overheating, high currents, deep discharges and overcharges);
  • Control of the state of cells (cans) in the battery;
  • Balancing cells in a battery.

Types of BMS protection boards

From the above, it is clear that the BMS board has a lot of tasks to solve. It is worth noting that boards from different manufacturers may not provide all the functionality listed above. The range of BMS protection boards can be divided into types:

  • Security devices (symmetrical and non-symmetrical type);
  • Balancing devices (active and passive types);
  • Complex devices that combine various functionalities.
  • Complex Smartdevices equipped with a system of visual control of parameters and allowing these very parameters to be changed.

Structure of BMS protection boards

The classic board layout includes:

  • Power controller;
  • Power mosfets (transistors) for switching;
  • Decoupling circuits for balancing;
  • Peripheral control devices (temperature meters).

BMS protection connection diagram

Depending on the type of BMS board itself and its functionality, boards can be connected in several ways. I would like to highlight two of them.

Symmetrical connection (charging and discharging the battery through the same connector):

Asymmetrical connection (charging and discharging of the battery is carried out through different connectors):


In lithium batteries (assemblies), the use of BMS protection boards is mandatory. BMS boards ensure the safe operation of both your lithium batteries and the devices that power those batteries.

1 reviews / Write a review
Related Products
Li-Ion 12V 13Ah (3s4p)
Li-Ion battery 12V 13Ah (3s4p) The rechargeable battery (ACB) is designed for stable output of high capacity during repeated deep charge-discharge cycles in electrical systems with a constant volta..
3,935.89 грн
Li-Ion 12V 21Ah (3s7p)
Li-Ion battery 12V 21Ah (3s7p) The battery is designed for stable high-capacity output during repeated deep charge-discharge cycles in electrical systems with a constant voltage of 12V. Specific..
5,910.49 грн
Li-Ion 12V 34Ah (3s10p)
Li-Ion battery 12V 34Ah (3s10p) The battery is designed for stable high-capacity output during repeated deep charge-discharge cycles in electrical systems with a constant voltage of 12V. Specifi..
8,548.72 грн
Related Articles
Charge balancer
26/04/2023 651
Charge balancer
Battery structure A modern battery is a series-parallel connection of elements according to a certain scheme. For example, a lithium battery Li-Ion 12V 21Ah (3s7p) consists of 21 lithium cells asse..
How to charge Lead-Acid
26/04/2023 683
How to charge Lead-Acid
How to properly charge lead-acid batteries Modern technologies are developing by leaps and bounds, and with them the manufacturing technologies of lead-acid batteries are developing. In today's..
Characteristics of Li-Ion battery
26/04/2023 648
Characteristics of Li-Ion battery
Lithium-ion battery (Li-ion) is a type of electric battery that is widely used in modern consumer electronics and finds its application as a power source in electric vehicles and energy storage device..
Write a review
Note: HTML is not translated!
    Bad            Good

Last Articles
Classification of men's classic shoes
26/12/2023 110
Classification of men's classic shoes
It is impossible to imagine an elegant and confident man without a pair of good shoes. Stylish, and most importantly, correctly selected shoes will highlight your individuality and create a successful..
Classification of women's shoes
26/12/2023 76
Classification of women's shoes
Fashionable misconceptions have been dispelled. Now you will know exactly how boots differ from shoes, and moccasins from slip-ons. Especially for you, we have prepared a shoe guide that will allow yo..
About iPhone 14
04/10/2023 146
About iPhone 14
About iPhone 14 - the best choice for everyone Introduction Apple continues to delight its fans with innovative devices, and the iPhone 14 is no exception. This new generation smartphone will br..
About iPhone 15
28/09/2023 162
About iPhone 15
About iPhone 15: the latest technology in your hands Features of iPhone 15 iPhone 15 is the latest innovation from Apple, representing the newest technology in smartphones. It has incredible..