ESS – Wireless battery management system (wBMS)

Products and reference designs

ESS – Wireless battery management system (wBMS)

Block diagram

Overview

Wireless battery management system(wBMS) shows potential, with wireless chipsets working
in conjunction with battery monitors to pass battery data from each cell to the main microcontroller. The inherent reduction in the number of required cables and harnesses lowers battery weight and saves costs.

Design requirements

  • Accurate gauging and monitoring
  • Secure authentication and protection
  • Reliable and fast communication
  • Robust data security/Cybersecurity

Block diagram

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ESS – Wireless battery management system (wBMS)

Cell balancing MOSFETs/BJT Cell balancingMOSFETs/BJT …… …… …… …… …… …… Power Power Iso-power Iso-power …… …… Wireless battery monitoring unit (wBMU) Wireless battery monitoring unit (wBMU) Iso-power Iso-power Power Power Iso-power Iso-power BAT+/Grid BAT+/Grid RACK+ RACK+ RACK- RACK- BAT+ BAT+ BAT- BAT- Wireless battery monitoring unit (wBMU) #n Wireless battery monitoring unit (wBMU) #n Wireless battery monitoring unit (wBMU) #1 Wireless battery monitoring unit (wBMU) #1 Wireless battery monitoring unit (wBMU) #2 Wireless battery monitoring unit (wBMU) #2 Battery data monitoring Battery data monitoring AFE/Monitor AFE/Monitor Temp Senser Temp Senser AFE/Monitor AFE/Monitor Secondary Protector Secondary Protector Secondary protector Secondary protector Temp sensor Temp sensor Humidity sensor Humidity sensor TMUX TMUX ESD ESD Insulation resistance detection Insulation resistance detection ADC ADC Solid state relay Solid state relay Isolation Isolation MCU MCU CAN CAN Op-AMP Op-AMP LDO LDO Isolated converter Isolated converter High voltage monitoring unit High voltage monitoring unit ADC ADC Current sensing Current sensing Op-AMP Op-AMP UIR UIR Solid state relay Solid state relay Iso-AMP Iso-AMP Wired communication Wired communication RS-485 RS-485 CAN CAN ESD ESD Isolation Isolation Ethernet PHY Ethernet PHY Auxiliary power supply Auxiliary power supply LDO LDO DC/DC DC/DC Isolated Converter Isolated Converter Isolated converter Isolated converter Wireless battery control unit Wireless battery control unit MCU MCU ESD ESD Isolation Isolation RTC RTC Watchdog Watchdog Supervisor Supervisor Relay driver Relay driver Wireless MCU Wireless MCU Wireless communication Wireless communication Watchdog Watchdog Wireless MCU Wireless MCU Level shifter Levelshifter LDO LDO DC/DC DC/DC

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