What is a BMS battery management system?
BMS is an electric vehicle battery management system and an important link between the vehicle power battery and the electric vehicle. BMS collects, processes, and stores important information during the operation of the battery pack in real time, exchanges information with external devices such as vehicle controllers, and solves key issues such as safety, availability, ease of use, and service life in the lithium battery system. The main function is to improve the utilization rate of the battery, prevent the battery from being overcharged and over-discharged, extend the service life of the battery, and monitor the state of the battery. In layman's terms, it is a system for managing, controlling, and using battery packs.
Why do battery packs need BMS？
1. Lithium-ion batteries have a limited range of use
For lithium-ion batteries, the ideal working range is very limited and not broad. Therefore, lithium-ion batteries must be managed during the application process, especially in the application scenarios of power batteries.
2. The potential safety hazards of lithium batteries are outstanding
Overvoltage (overcharge), overcurrent and overtemperature will bring a series of safety hazards to lithium-ion batteries, such as deformation, expansion, fire or even explosion
3. Lithium battery performance management
The external characteristics of lithium batteries have a great relationship with their own state (SOC/SOH/temperature) and ambient temperature. To make better use of the performance of lithium batteries, it is necessary to have a BMS to monitor and manage the state of the battery at any time.
4. Consistency management of lithium battery cells.
The lithium battery pack is composed of multiple lithium battery cells. If there is no BMS with equalization function, the lithium battery pack cannot fully utilize the power of each cell.
Therefore, the battery protection board BMS is needed to balance the power and voltage of each battery cell, so that the battery pack can achieve the maximum low efficiency.