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Advanced Fuel Gauge Use Case: E-Bikes

USE CASE

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This use case examines the application of the MPF42791 in e-bikes.

The MPF42791 offers an advanced method for estimating and managing the state-of-charge (SOC) and state-of-health (SOH) of the battery pack as well as individual cells, up to 16 series cells.

The e-bike market is experiencing tremendous growth as a mode of transportation for both utility and leisure. Compared to standard bicycles and other transportation modes, e-bikes offer a unique combination of affordability, environmental friendliness, and practicality. As the demand for e-bikes grows, consumers are increasingly interested in e-bikes with enhanced features such as LCD displays, powerful lighting, and smartphone integration. High-accuracy, detailed battery status indication is a key feature of advanced e-bikes that replaces the simple three-bar state-of-charge (SOC) indicator.

The MPF42791 offers an advanced method for estimating and managing the state-of-charge (SOC) and state-of-health (SOH) of the battery pack as well as individual cells, up to 16 series cells. Furthermore, the MPF42791 can achieve SOC accuracy within 2.5% when paired with the MP2797 battery monitor. The MPF42791 also provides range indication, instantaneous available power, charge time to full battery, and runtime to empty battery. Using the I2C interface on the MPF42791, the e-bike’s display panel quickly provides these crucial metrics to the cyclist.

The MPF42791 is available in a compact TQFN-32 (4mmx4mm) package.

Additional features include:


  • Supports a Wide Variety of Lithium Cells
  • Adaptive Learning Can Be Enabled to:
    • Refine Initial Charge Settings
    • Refine Initial Discharge Settings
    • Update Individual Cells’ SOH to Track Degradation
    • Update Equivalent Series Resistance (ESR) to Track Degradation
  • Provides Lifetime Logging
  • 2.5V Minimum Supply Voltage
  • Low Current Consumption
    • 6μA in Disabled Mode
    • 135μA (Average) in Operating Mode during Rest
  • Supports Up to 400kHz I2C with CRC for Robust Communication
  • Available in Turn-Key MPS BMS Module:
    • MBM1xS-P50-B and MBM1xS-P100-B