Stacked battery technical indicators

What is a stackable battery monitoring and management integrated circuit?

This paper describes a stackable battery monitoring and management integrated circuit for EVs. Owing to the number of cells in the series, the amount of data transmitted by the BMS is significant. The integration of digital control and registers in the BMIC is necessary for the efficient execution of each function.

Can bq79616 devices be stacked in series?

For very high cell count systems, BQ79616 devices can be stacked in series to monitor battery cells. This design uses two BQ79616 devices to monitor up to 32s battery cells. The bottom BQ79616 monitors the lower 16s battery cells, and the top BQ79616 monitors the upper 16s battery cells.

What is a modular battery monitor?

A modular design can be used as the basis for very large battery stacks. It allows battery packs to be distributed over larger areas for more effective use of space. Analog Devices has developed a family of battery monitors capable of measuring up to 18 series connected cells.

What is a battery monitor IC?

In this case, the battery monitor IC is the 12-cell LTC6811. The cell measurement range is 0 V to 5 V, making the IC suitable for most battery chemistries. Multiple devices can be connected in series, permitting simultaneous cell monitoring of long, high voltage battery stacks. The device includes passive balancing for each cell.

What is a stacked bus design?

The design monitors each cell voltage, cell temperature, and protects the battery pack to secure safe use. This design uses an onboard and offboard daisy-chain communication interface for a cost-effective stacked bus connection. These features make this reference design applicable for high-capacity battery pack applications.

What parameters should be measured in a battery pack?

For effective management, the critical cell parameters to be measured are terminal voltage, charge/discharge current, and temperature. The measurement performance needed for modern battery packs is fairly high: each cell must be measured to within a few millivolts (mV) and milliamps (mA), and to about a degree centigrade (°C).