US 12,345,768 B2
Temperature estimation using electrochemical impedance spectroscopy
David Magee, Allen, TX (US); and Kartik Sastry, Atlanta, GA (US)
Assigned to TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed by TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed on Apr. 28, 2022, as Appl. No. 17/732,012.
Prior Publication US 2023/0349979 A1, Nov. 2, 2023
Int. Cl. G01R 31/3842 (2019.01); G01R 31/367 (2019.01); H01M 10/48 (2006.01)
CPC G01R 31/3842 (2019.01) [G01R 31/367 (2019.01); H01M 10/486 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An apparatus comprising:
a temperature circuit configured to set a frequency of voltage modulation or current modulation for a battery cell;
voltage measurement circuitry coupled to the temperature circuit, the voltage measurement circuit configured to measure a voltage of the battery cell at the frequency to produce a measured voltage; and
current measurement circuitry coupled to the temperature circuit, the current measurement circuit configured to measure a current of the battery cell at the frequency to produce a measured current; and
wherein the temperature circuit is further configured to:
determine an impedance of the battery cell at the frequency based on the measured voltage and the measured current; and
determine a temperature of the battery cell based on a feature vector including at least two features of the impedance at the frequency, the at least two features comprising a first impedance feature and a second impedance feature, wherein the first impedance feature is an inverse term and the second impedance feature is a non-inverse term.