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Single-chip battery solution aims at e-bike apps

Posted: 25 Jul 2011     Print Version  Bookmark and Share

Keywords:battery management  balancing solution  power tools 

Texas Instruments Inc. (TI) touts the industry's first fully integrated battery protection and cell-balancing solution for Li-Ion and lithium iron phosphate battery packs. 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.

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 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.

The bq77910 battery management and protection device can manage 4- to 10-cell lithium batteries and provides individual cell monitoring and balancing with internal FETs that maximises battery pack service life and performance. The bq77910 works on low power operation and offers low quiescent current (50µA typical, 2.5µA in shutdown mode) that minimises battery discharge during storage or idle periods to optimise battery life.

It also supports additional lithium battery chemistries and thus programmable (EEPROM) fault detection thresholds and time delays make the bq77910 adaptable to all variations of lithium systems, including LiCoO2 and LiFePO4.

The bq77910 claims to be a stand-alone integrated solution that does not require an external controller or processor.

TI offers the bq77910EVM-001 evaluation module and the bq77908-10-GUI-SW evaluation software to speed the implementation of the bq77910 family of devices.

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