SLUUCW4 November 2023 BQ27Z558
This section describes the process of finding the chemistry identifier, sometimes referred to as Chemical ID or ChemID, of a battery that is used. The ChemID is a necessary element of the Impedance Track™ algorithm that needs to be identified before performing a learning cycle. For the Golden File creation process, using the exact same type of battery that is used in production is necessary. Use this battery for the proceeding sections, as well.
Texas Instruments has a database of thousands of battery profiles, and the ChemID selection process identifies either the exact battery profile or the most similar. This ChemID is then programmed into the gauge, updating dataflash with the battery profile. This profile is used in the Impedance Track™ algorithm for capacity and resistance learning as well as for capacity prediction and other features.
The Chemical ID selection process consists of recording the current, voltage, and temperature (IVT) of a battery during a charge and discharge. This data is then submitted to the online Gauging Parameter Calculator (GPC) Tool, which then gives the customer a report with a best-fit Chemistry ID to program into their gauge. The process performed with this hardware is a charge-relaxation-discharge-relaxation test. A programmable power supply is recommended for this process.