Battery monitoring technology adds precision for lead-acid chemistry

April 17, 2013 // By Graham Prophet
Texas Instruments has introduced a “gas gauge” IC with Impedance Track function that accurately monitors state-of-health, and state-of-charge of lead-acid batteries used in uninterruptible power supplies and e-bike designs

The first lead-acid battery management gas gauge integrated circuit with TI’s proprietary Impedance Track capacity measurement technology, the bq34z110, which comes in a small 14-pin package, is the only scalable power management device to support multi-cell lead-acid battery packs with battery voltages of 4V, 12V, 24V, 48V and higher. The highly accurate, simple-to-use gauge supports batteries used in mobile and stationary applications such as medical instruments, wireless base stations and telecom shelters, e-bikes, inverters and uninterruptible power supplies (UPS). The

Lead-acid batteries typically behave better than lithium chemistries in environments with wide temperature ranges. However, today’s lead-acid battery designs do not accurately measure and report current battery capacity, which often frustrates the end user, and could mean adding more batteries to keep the system adequately charged. The new bq34z110 gauge with Impedance Track technology constantly informs a user about the battery’s state-of-health and state-of-charge and maintains up to a 95%-accurate capacity measurement for the entire life of the battery. This information also prevents premature shutdown, increasing the longevity of the battery and end-equipment.

The bq34z110 is a multi-cell scalable battery gauge to support a wide range of lead acid batteries (4V to 64V), including large capacity batteries (1 Ahr to 65 Ahr and higher) and high-current applications (0A to 32A and higher). Impedance Track uses current, voltage measurements, temperature and battery characteristics to determine battery state-of-charge, state-of-health and capacity. The chip is supported with application notes, user guide and bq34z110EVM evaluation module.