Futavis GmbH

The requirements for functional safety demand a safety level of at least ASIL C for the battery shutdown. The Futavis S-Box is developed according to international standards (including ISO 26262 or IEC 60730 as well as LV 123 and LV 124) and can therefore withstand the required safety requirements. In addition, the modular Futavis S-Box as a series product is perfectly matched to our BMS and, thanks to its small and compact design, can be used in a wide range of applications. The modular development approach also allows the S-Box to be used for batteries of up to 1000 V DC. Whereby the number of modules and cells can be freely scaled.

The "Cell Supervison Circuit" CSC board is responsible for monitoring the temperature and cell voltage. One CSC board is used per battery module, which usually consists of 7-14 cells. The CSC can provide interfaces and passive balancing for all cells. In addition, each CSC board contains up to six (NTC) temperature sensors. Since the cells are usually not 100% equally charged, the CSC measures the cell voltages and compensates for the differences by additionally discharging the stronger cells. The connection between the CSC's and between the first CSC and the master is realized by means of High Speed Differential Isolated Communication.

The master is the higher-level control unit of the battery. It includes processing of signals, measurements, communication and control interfaces. One master can control up to 15 CSC boards. The master is responsible for monitoring and controlling the entire battery system, as well as communicating with the other masters, CSC's and other components of the end system. It determines the battery State of Charge (SOC) and State of Health (SOH), and also monitors cell voltages, currents and temperatures, ensuring safe battery operation. Thus, the shutdown in case of over- or undervoltage, over- or undertemperature can be controlled, the balancing can be implemented and all measured parameters can be stored and processed. A special feature of our Master is that in a multi-string setup no further Master is needed as Master-Master. One of the masters already present in the system can take over all the functions of the system master. Read more here. The master uses input signals such as Enable, HV Enable, Charge Enable. HV Interlock. Furthermore, the master provides some additional unused GPIOs for user-defined functionalities.

The EloPower 35 is a battery based on NMC cell technology for bus and commercial vehicle applications, developed according to the highest safety standards of ISO26262. It is suitable for heavy duty areas, as it is designed with a very robust housing.

The EloTrail 3o is a battery based on LFP cell technology, developed according to the highest safety standards of ISO 26262. It is suitable, among other things, for heavy-duty applications, as it is designed with a very robust housing.