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IC protects battery packs for e-bikes, power tools

July 19, 2011 | Christoph Hammerschmidt | 222901699
IC protects battery packs for e-bikes, power tools E-bikes and power tools are target applications for Texas Instruments' integrated battery protection and cell-balancing solution for Li-Ion and lithium iron phosphate battery packs. The device simplifies battery pack designs for e-bikes, e-scooters, portable gardening tools, power tools and uninterruptible power supplies (UPS) and can also be used when replacing lead acid batteries.

The bq77910 battery management and protection device can manage 4- to 10-cell battery packs, and two devices can be stacked to protect 11- to 20-cell packs. It protects the battery pack by monitoring individual cell voltages and drives two N-channel power MOSFETs to interrupt current flow during fault conditions. Fault detection and recovery criteria for the device are fully programmable in non-volatile memory to suit all types of lithium battery systems.

Key features and benefits of the bq77910 include

 

  • Battery management and protection for 4- to 10-cell lithium batteries: Individual cell monitoring and balancing with internal FETs maximizes battery pack service life and performance.

  • Low power operation: Low quiescent current (50 uA typical, 2.5 uA in shutdown mode) minimizes battery discharge during storage or idle periods to optimize battery life.

  • Supports additional lithium battery chemistries: Programmable (EEPROM) fault detection thresholds and time delays make the bq77910 adaptable to all variations of lithium systems, including LiCoO2 and LiFePO4.

  • Standalone integrated solution does not require an external controller or processor.

The bq77910 is available in a 38-pin TSSOP package, priced at $2.70 in quantities of 1,000.   

 










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