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 is a 2 to 16 stacked cells battery pack fuel gauge that 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

For more information, explore MPS's high-performance battery management solutions.