STMicroelectronics AEK-POW-BMSNOTX BMS Evaluation Board

A non-isolated battery management node dedicated to auxiliary battery packs directly connects the MCU via standard SPI protocol. The board is ideal for auxiliary battery systems to supply power for devices (such as audio systems, window cleaning systems, seat heating, light systems, light signalization, and climate control systems) connected to your vehicle (even when the engine is not running), ensuring the main starting battery is reserved for engine cranking and vehicle electrical requirements. The STMicroelectronics AEK-POW-BMSNOTX provides an elaborate monitoring network to sense the voltage of each cell and manages four to 14x battery cells. It is possible to sense the current of the entire battery pack. This sensing allows for the SOC of each battery cell and, consequently, the state of charge of all battery packs to be elaborated on. 

The SOC allows assessing the remaining battery capacity, which equates to the remaining driving range. For maintenance reasons, monitoring the SOC estimation over time is essential. According to our algorithm for the SOC calculation, the more the SOC differs from its nominal value (that is, its value when the batteries are new), the more a cell of the battery pack risks over-discharging. Thus, the SOC evolution over time allows asserting a cell's state of health (SOH) or a battery pack to spot early indications that a cell is at risk of over-discharge or overcharging.