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Battery monitors improve safety of li-ion batteries

21 May 2014

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Texas Instruments has developed the first scalable, multi-cell battery monitors that increase battery pack safety and reduce design time of 12V to 48V lithium-ion and lithium-iron phosphate batteries used in e-bikes, power tools, and energy storage systems.

The bq76920, bq76930, and bq76940 circuits protect and control 3- to 15-cell batteries when charging or operating in harsh environment conditions.

The monitors incorporate cell-balancing drivers, regulated output supplies, and other features to reduce external component count and provide heightened protection against over-voltage, under-voltage, and over-current conditions. Simplifying battery design and optimising board space, the bq76920 supports 3- to 5-series cells or typical 18V packs; the bq76930 manages up to 10-series cells or 36V packs; and bq76940 monitors up to 15 cells or typical 48V batteries.

Designers can jump-start their battery designs with three new reference boards.

  • 18V Battery Monitoring (bq76920EVM) supports 3- to 5-series cell packs, and includes the bq76920, a battery management controller for complete monitoring and protection, an interface adapter and software to evaluate register control and configuration.
  • 36V Battery Monitoring (bq76930EVM) supports 6- to 10-series cell batteries, and includes the bq76930, a battery management controller for monitoring and protection, an interface adapter and evaluation software.
  • 48V Battery Monitoring (bq76940EVM) supports 9- to 15-cell batteries, and includes the bq76940, a battery management controller for complete monitoring and protection, an interface adapter and evaluation software.

The bq76920, bq76930, and bq76940 multi-cell battery monitors are available in volume production through TI and its worldwide network of authorised distributors. The bq76920 comes in a 20pin, 4.4mm by 6.5mm TSSOP package with a suggested resale price of $1.50 each in 1,000-unit quantities; the bq76930 comes in a 30pin, 4.4mm by 7.8mm TSSOP package with a suggested resale price of $2.75 each in 1,000-unit quantities; and the bq76940 comes in a 44pin, 4.4mm by 11.3mm TSSOP package with a suggested resale price of $3.95 each in 1,000-unit quantities.




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