TI's new technology measures electricity -Lithium - Ion Battery Equipment

TI's new technology measures electricity -Lithium - Ion Battery Equipment

Today, Texas Instruments (TI), leveraging its strong R&D strength in battery management, announced a unique "Gas Gauge" technology that can calculate lithium-ion battery packs with up to 99% accuracy over the entire battery life cycle of remaining power. The new ImpedanceTrack™ technology enables designers and users of portable medical equipment, industrial equipment and notebooks to extend battery life and always know the available energy remaining in the battery.

Taking battery fuel monitoring technology to the next level

TI's innovative impedance tracking technology accurately monitors impedance changes or resistance caused by battery aging, temperature, and cycling patterns to accurately predict runtime for two-, three- and four-cell packs. The technology is integrated into TI's flash-based bq20z8x fuel gauge chipsets, and allows accurate state-of-charge analysis by correlating the battery pack's no-load voltage and state-of-charge at the appropriate temperature when the battery pack is at rest.(Lithium - Ion Battery Equipment)

The technology enables the exact "start and stop position" to be unambiguously derived from the quiescent voltage and the total capacity from the corresponding capacity difference, eliminating the need for full charge and discharge. For specific applications like pacemakers or battery packs used in telecommunications systems that never fully discharge, impedance tracking will ensure that we always have accurate power information in real time.

Plug-and-play battery design

Impedance tracking relies on dynamic modeling algorithms to know how much a battery has degraded with age, temperature, or use, and correlates with the typical chemistry of the anode/cathode in the battery's electrolyzer, regardless of the battery's brand. In fact, impedance tracking allows cells from different manufacturers to be mixed in the same battery pack, which enables flexibility and continuity of power supply. Many current gas gauge IC technologies rely on static and unreliable modeling techniques that require the creation of large databases to measure specific properties of hundreds of available battery parameters. And the patent-pending impedance tracking technology can significantly reduce the development and implementation setup time required by OEDs and OEMs, ensuring that the correct characteristics are obtained because we don't need any more databases.

Multi-Cell Fuel Gauge Chipset Family with Impedance Tracking Technology

The dual-chip bq20z8x fuel gauge reports power information to the system host controller through the System Management Bus (SMBus) interface. Host controllers such as the TMS320C55x digital signal processors manage remaining battery power to further extend system runtime. The bq20z8x chipset also features TI's protected analog front-end (AFE) chip, the bq29312, and integrates a 3.3V, 25mA linear step-down (LDO) regulator.

The right fuel gauge technology for the future

Anti-tracking was originally aimed at multi-cell Li-ion battery pack applications, but is also capable of supporting other types of battery chemistries such as nickel-metal hydride (NiMH) or nickel-cadmium (NiCD). In addition, TI plans to make the technology suitable for single-cell Li-ion powered applications such as smart phones, digital cameras, and pDAs.



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