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Overview
The rapid growth of the Hybrid-Electric Vehicle (HEV) and Electric Vehicle (EV) industry presents many new opportunities and unknowns for product testing. One of the major components of the vehicle's power train is the Battery Management System (BMS) and its accompanying modules. The system as a whole controls the performance of the Energy Storage System (ESS) and has general functionality such as voltage and current monitoring, cell balancing, determining state of charge, and ensuring overall pack safety.
The architecture of standard HEV and EV energy storage systems consists of a BMS board and a series of modules (Figure 1). A module contains a module board and a cell stack, which typically consists of series and/or parallel connected lithium-ion (Li-ion) cells. The module board performs all of the cell and temperature monitoring for its specific cell stack while communicating status back to the BMS via a CAN interface. Combining the modules creates a battery pack that can deliver over 600V at 500A. The BMS is responsible for system level monitoring such as pack current and voltage levels, system safety, and managing all of the modules to achieve optimal ESS output and performance.
System Requirements
Bloomy Controls has developed a modular, mixed-signal, high-performance test system specifically for testing battery management systems and modules for HEV and EV companies. The system can test all aspects of the BMS and module boards including:
- Overall battery pack monitoring
- Individual cell monitoring
- Over voltage and under voltage protection
- Cell balancing
- Inrush current switching
- Non-volatile memory storage
- Temperature monitoring
- System communications (CAN, Serial, etc.)
- Safety interlocks / fault condition recognition
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