Method and circuitry to determine temperature and/or state of health of a battery/cell

摘要

Techniques and circuitry, in one embodiment, determine a temperature of a battery by applying a calibration packet to the battery's terminals and at the battery's first SOC, wherein the calibration packet includes a first pulse (charge or discharge) which temporally precedes a rest period. In one embodiment, measurement circuitry measures a first terminal voltage at a time immediately prior to or at a beginning of the first pulse of the calibration packet, and a second terminal voltage, in response to the calibration packet, at a time during the partial relaxation time period of a battery. Control circuitry determines a partial relaxation time voltage (VPRT) at the battery's first SOC using the first and second terminal voltages and determines a temperature of the battery by correlating the VPRT at the first SOC to a temperature of the battery at the battery's current SOH.

主权项

1. A method to determine a temperature of a battery, wherein the battery includes at least two terminals, the method comprising:
applying a first calibration packet to the terminals of the battery at a first state of charge (SOC) of the battery, wherein the first calibration packet includes a first pulse and a rest period, wherein the first pulse temporally precedes the rest period; measuring a plurality of voltages at the terminals of the battery, including:
a first terminal voltage at a time immediately prior to or at a beginning of the application of the first pulse of the first calibration packet, anda second terminal voltage, in response to the first calibration packet, at a time during the partial relaxation time period of a battery; determining a partial relaxation time voltage (VPRT) at the first SOC of the battery using the first and second terminal voltages; and determining a temperature of the battery by correlating the partial relaxation time voltage (VPRT) at the first SOC of the battery to a temperature of the battery for the first SOC and a particular state of health (SOH) of the battery.