An automotive battery management system (BMS) is the “brain” of an electric vehicle battery pack, and its performance greatly affects the driving range and battery life of an electric vehicle. Renesas products are ideal for accurate and safe BMS applications.

This reference design operates as an example of a complete automotive battery management system for up to 70 series-connected Li-ion cells. The RH850 microcontroller (MCU) communicates with the ISL78714 multi-cell Li-ion battery manager devices to monitor cell voltage, pack temperature and current, record significant fault detection, and control cell balance. The ISL78714 contains daisy chain hardware to provide robust, isolated communication between batteries. The RH850 can interface to multiple CAN, LIN, UART, and RS-485 buses and control multiple PWM outputs. The reference design is based on the ISL78714BMS5XBEKIT1Z automotive-grade multi-cell Li-ion battery manager reference design kit.

For application models and software corresponding to the kit, visit the Automotive BMS Application Model & Software page.

System Benefits:

  • Best BMS accuracy and long-term drift (LTD), which extend driving range and battery life performance, with superior accuracy of 2mV and 6 sigma LTD
  • Lowest BOM cost and best FuSa/EMI/EMC/hot-plug solution, which alleviates R&D effort and is easy to use with Renesas' RH850 MCU Family (with dedicated drivers and additional application software for BMS)
  • Immediate ASIL software development enabled by ISL78714 Complex Device Driver (CDD) managing BMS measurements and functional safety features
  • A wide range of MCU line-up with security features can support functional safety up to ASIL D
  • Intelligent power device (IPD) for external load control
  • Complete assessment and development platform optimized for automotive battery management systems

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Automotive BMS Application Model & SoftwareBMS application models and software reduce the effort and time required to develop applications to estimate State Of Charge and State Of Health. Software Package Renesas


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Battery Management Solution for Electric Vehicles

In electric vehicles today, there are two key parameters, the state of health and the state of charge. Renesas' Battery Management Solution (BMS) device supports these parameters. This demonstration highlights Renesas' ISL78714 automotive-grade Li-ion battery manager IC and the RH850/P1M 32-bit automotive microcontroller (MCU). In addition to the ISL78714 battery manager IC and RH850 MCU, the demo board is supported by a host of other Renesas products including the RAA270005 power management IC (PMIC), RV1S2752Q photocoupler, and the uPD166031A/32/33/34 and RAJ2800024/34/44 integrated power devices (IPDs).

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