E-Mobility : High Voltage Battery Management Systems (BMS
Whether with a purely electric drive or as a hybrid vehicle - Preh has been pioneering eMobility solutions for more than 10 years focusing on Battery Management
The battery management system (BMS) is the “brain” of a battery pack. The BMS is a set of electronics that monitors and manages all of the battery's performance. It also keeps the battery from operating outside of its safety margins, increasing its longevity and protecting the users.
In the case of electric or hybrid vehicles, the BMS is only a subsystem and cannot work as a stand-alone device. It must communicate with at least a charger (or charging infrastructure), a load, thermal management and emergency shutdown subsystems.
Low-voltage centralized BMSes mostly do not have any internal communications. Distributed or modular BMSes must use some low-level internal cell–controller (modular architecture) or controller–controller (distributed architecture) communication. These types of communications are difficult, especially for high-voltage systems.
In this method, the BMS will request a lower charge current (such as EV batteries), or will shut-off the charging input (typical in portable electronics) through the use of transistor circuitry while balancing is in effect (to prevent over-charging cells). BMS technology varies in complexity and performance:
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