Method and circuitry to determine temperature and/or state of health of a battery/cell
First Claim
1. An apparatus to determine a temperature of a battery at a plurality of states of charge of the battery, wherein the battery includes at least two terminals, the apparatus comprising:
- charging circuitry, responsive to control signals, to generate a signal which is applied to the terminals of the battery, wherein the signal includes a plurality of calibration packets, wherein each calibration packet includes a first pulse and a rest period, wherein the first pulse temporally precedes the rest period;
measurement circuitry, coupled to the battery, to measure voltages at the terminals of the battery, wherein the measurement circuitry measures at least two voltages corresponding to a first calibration packet which is one of the plurality of calibration packets, 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 during the partial relaxation time period of the battery which is in response to the first calibration packet; and
control circuitry coupled to the charging circuitry and the measuring circuitry, wherein the control circuitry is configured to;
generate a first control signal at a first state of charge (SOC) of the battery, wherein in response thereto, the charging circuitry generates the first calibration packet;
determining a partial relaxation time voltage (VPRT) of the battery associated with the first calibration packet using the first and second terminal voltages; and
determining a temperature of the battery at the first SOC of the battery using the partial relaxation time voltage (VPRT) of the battery associated with the first calibration packet and a state of health (SOH) of the battery.
1 Assignment
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Accused Products
Abstract
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.
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Citations
10 Claims
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1. An apparatus to determine a temperature of a battery at a plurality of states of charge of the battery, wherein the battery includes at least two terminals, the apparatus comprising:
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charging circuitry, responsive to control signals, to generate a signal which is applied to the terminals of the battery, wherein the signal includes a plurality of calibration packets, wherein each calibration packet includes a first pulse and a rest period, wherein the first pulse temporally precedes the rest period; measurement circuitry, coupled to the battery, to measure voltages at the terminals of the battery, wherein the measurement circuitry measures at least two voltages corresponding to a first calibration packet which is one of the plurality of calibration packets, 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, and a second terminal voltage during the partial relaxation time period of the battery which is in response to the first calibration packet; and control circuitry coupled to the charging circuitry and the measuring circuitry, wherein the control circuitry is configured to; generate a first control signal at a first state of charge (SOC) of the battery, wherein in response thereto, the charging circuitry generates the first calibration packet; determining a partial relaxation time voltage (VPRT) of the battery associated with the first calibration packet using the first and second terminal voltages; and determining a temperature of the battery at the first SOC of the battery using the partial relaxation time voltage (VPRT) of the battery associated with the first calibration packet and a state of health (SOH) of the battery. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification