Analog Devices has announced its expanded portfolio of battery management system (BMS) products including ASIL-D functional safety and new low-power features to enable continuous battery monitoring. These new devices further differentiate ADI’s BMS platform that today delivers the industry’s best proven accuracy, and supports all key battery chemistries—including zero-Cobalt LFP (lithium iron phosphate)—for mass market electric vehicles (EVs) and energy storage systems (ESS) used for reuse and recycling of battery packs.
ADI’s newest BMS products support multiple battery cell configurations and deliver innovative low-power features that enable the battery to be monitored continuously even when the vehicle is turned off to ensure safety under all conditions while maximizing vehicle range.
The ADBMS6817 is a multicell battery stack monitor that measures up to 8 series connected battery cells with a lifetime total measurement error (TME) of less than 1.5mV. The cell measurement range of 0V to 5V makes the ADBMS6817 suitable for most battery chemistries. All 8 cells can be measured in 304 µs, and lower data acquisition rates can be selected for high noise reduction.
Multiple ADBMS6817 devices can be connected in series, permitting simultaneous cell monitoring of long, high voltage battery strings. Each ADBMS6817 has an isoSPI interface for high speed, RF immune, long distance communications. Multiple devices are connected in a daisy chain with one host processor connection for all devices. This daisy chain can be operated bidirectionally, ensuring communication integrity even in the event of a fault along the communication path.
The ADBMS6817 can be powered directly from the battery stack or from an isolated supply. The ADBMS6817 includes passive balancing for each cell, with individual pulse-width modulation (PWM) duty cycle control for each cell. Other features include an on-board 5V regulator, seven general purpose input/output (GPIO) lines, and a sleep state, where current consumption is reduced to 5.5µA.
Analog Devices | www.analog.com