System Overview

 

Battery management systems have six major functions:

  • Cell voltage and temperature measurement
  • Cell energy balancing/equalization
  • Cell voltage and temperature management
  • State-of-Charge estimation – tracking the amount of energy in each cell/the pack at a given point in time
  • State-of-Health estimation – tracking capacity loss across cell/pack life
  • Fault prevention and detection – protecting the battery pack and users

 

Battery pack performance and useful life cannot be maximized without leveraging specialized electronics which have these capabilities. These functions can be fulfilled in a variety of ways, with associated hardware and software implemented in a single device or dispersed across multiple devices or components. To maximize customer application flexibility while minimizing time to market and development and unit costs, Infotronix chooses the latter approach, thoughtfully designing and selecting components which can be combined in a modular fashion.

Accurate, robust cell voltage and temperature measurement and the ability to balance/equalize cell energy across a battery pack are the baseline functions of any BMS. Infotronix has encapsulated these functions in a series of monitoring and balancing boards (MBBs). MBB design and function are predicated not only on accuracy and robustness, but also ease-of-use, flexibility and extensibility to both enable and ensure modularity. For example, academic and corporate research laboratories can leverage individual MBBs in support of basic battery and algorithm development activities. Drone and robot manufacturers can use individual or collections of MBBs with or without additional components to ensure critical tasks are completed successfully and safely without damage to goods or injury to humans. As the complexity of cell voltage and temperature management, State-of-Charge (SOC) and State-of-Health (SOH) estimation and fault prevention and detection functional requirements increases, additional components can be added to enable even greater BMS capabilities.  For example a display, current sensor, supervisory controller (coordinates system-wide function) and insulation monitoring device (used to detect and avoid shock hazards) can be added to support electric vehicle applications.

Please contact us to learn more about the reference BMS designs Infotronix has established as well as to discuss leveraging existing content in custom designs.

 

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