Battery Management System: What is it? & Why do we need?

What is a battery management system?

Battery management system (Abbreviated as BMS) is an electronic system that manages rechargeable batteries. It can also be called a battery nanny or a battery steward. It is a device that monitors the status of energy storage batteries, mainly for intelligent management and maintenance of each battery unit. In the use of the battery, it is like the "brain" or "heart" of the battery. Prevent the battery from being overcharged and over-discharged, prolong the service life of the battery, and monitor the battery status. Generally, BMS is represented as a circuit board or a hardware box.
Battery Management System What is it & Why do we need
BMS is one of the core subsystems of the battery energy storage system. It is responsible for monitoring the operating status of each battery in the battery energy storage unit to ensure the safe and reliable operation of the energy storage unit. BMS can monitor and collect the status parameters of energy storage batteries in real time (including but not limited to single battery voltage, battery pole temperature, battery loop current, battery pack terminal voltage, battery system insulation resistance, etc.). The necessary analysis and calculation of the relevant state parameters are carried out to obtain more system state evaluation parameters, and the effective control of the energy storage battery body is realized according to the specific protection control strategy to ensure the safe and reliable operation of the entire battery energy storage unit.
At the same time, the BMS can interact with other external equipment (PCS, EMS, fire protection system, etc.) through its own communication interface, analog/digital input input interface, and form the linkage control of the various subsystems in the entire energy storage power station to ensure the safety and reliability of the power station , Efficient grid-connected operation.


Why do we need battery management system?

Data shows that 80% of battery spontaneous combustion accidents occur during charging or within 1 hour after being fully charged. In many cases, overcharge, overdischarge and other abuse of the battery can easily directly or indirectly cause damage or spontaneous combustion of the battery.

Electric vehicles use lithium batteries as the main power source, which is due to the advantages of high energy density of lithium batteries, so the performance is relatively stable. However, the quality of lithium batteries is not easy to grasp during mass production. There are slight differences in the power of the battery cells when they leave the factory. With the change of operating environment and other factors, the inconsistency between the batteries will become more obvious, and the battery efficiency and life will also deteriorate. Overcharge or overdischarge may lead to safety issues such as fire and combustion in severe cases.

BMS can accurately measure the battery pack usage status, protect the battery from excessive charging and discharging, balance the power of each battery in the battery pack, and analyze and calculate the power of the battery pack and convert it into understandable endurance information to ensure the safety of the power battery Operation.

If fires caused by charging can be effectively avoided, the safety accidents of electric vehicles will be greatly reduced. At this time, we need to learn about BMS.

Where to buy battery management system?

There are many BMSs on the market. For novices, it is recommended to buy a cheap and pure hardware BMS, which is very suitable for novices. Low price battery protection board:

But suppose you use BMS on a more expensive device and pay more attention to the quality of the product, it is recommended that you buy High-quality automotive-grade chip battery protection board:


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