Monitoring the battery
Depending on the design, a battery management system measures cell voltages, pack current and temperatures. Some systems also estimate state of charge or state of health. Texas Instruments groups battery management functions into areas including monitoring, protection, balancing and gauging.
Protection functions
A BMS may respond to conditions such as overvoltage, undervoltage, excess current or short circuits. The thresholds and response behavior must suit the selected cells and application. Protection is part of the overall battery design; it is not a substitute for properly rated cables, connectors, fuses and installation practices.
Cell balancing
Cells in a series pack do not always reach the same state at the same time. Balancing is used to manage differences between cells. The balancing strategy and capability depend on the design, so it is useful to ask how the BMS is configured for the pack rather than judging it only by a current rating.
Communication with the equipment
CAN, RS485 and other interfaces can allow a battery to exchange information with an inverter, controller or display. Interface type and protocol are different details. A custom project should define the messages and behavior expected by both ends of the connection.
What to specify when requesting a pack
Provide the application voltage window, continuous and peak currents, operating temperatures, communication requirements and expected failure responses. Yinan can review the BMS configuration alongside the cells, enclosure and electrical interfaces so the battery functions as an integrated system.
Further Reading
Texas Instruments: Battery management ICs and functions
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