US Patent No. 9,817,076

ESTIMATION CIRCUIT FOR SOC AND SOH OF BATTERY


Patent No. 9,817,076
Issue Date November 14, 2017
Title Estimation Circuit For Soc And Soh Of Battery
Inventorship Chua-Chin Wang, Kaohsiung (TW)
Wen-Je Lu, Kaohsiung (TW)
Min-Yu Tseng, Kaohsiung (TW)
Assignee NATIONAL SUN YAT-SEN UNIVERSITY, Kaohsiung (TW)

Claim of US Patent No. 9,817,076

1. An estimation circuit for determining a State of Charge (SOC) and a State of Health (SOH) of a battery includes:
a control circuit configured for receiving a reset signal, a voltage signal and a current signal, wherein the control circuit
is further configured to determine a voltage level of an electrical-capacity calculation reset signal, an estimation optional
signal, an over voltage enable signal, a normal state enable signal, a low voltage enable signal and a current-estimated reset
signal configured to be outputted from the control circuit according to the reset signal, the voltage signal and the current
signal;

a current estimation circuit having a current modification circuit and a Coulomb integral circuit, wherein the current modification
circuit is configured to receive the current signal and multiply the current signal by a modification parameter and output
a modified current signal, the Coulomb integral circuit is configured to receive the modified current signal and the current-estimated
reset signal of the control circuit and integrate the modified current signal to output an estimating electrical-capacity
value;

an open-circuit voltage detection circuit configured for receiving the voltage signal, wherein the open-circuit voltage detection
circuit is configured to output an initial electrical-capacity value according to the voltage signal;

a multiplexer configured for receiving the estimation optional signal of the control circuit, the estimating electrical-capacity
value of the current estimation circuit and the initial electrical-capacity value of the open-circuit voltage detection circuit,
wherein the multiplexer is configured to output an estimating electrical-capacity signal and determine the estimating electrical-capacity
signal equal to the estimating electrical-capacity value or the initial electrical-capacity value according to the estimation
optional signal; and

an electrical-capacity calculation circuit having an over voltage register, a normal state register and a low voltage register,
wherein the over voltage register is configured to receive the estimating electrical-capacity signal, the electrical-capacity
calculation reset signal and the over voltage enable signal, the normal state register is configured to receive the estimating
electrical- capacity signal, the electrical-capacity calculation reset signal and the normal state enable signal, the low
voltage register receives the estimating electrical- capacity signal, the electrical-capacity calculation reset signal and
the low voltage enable signal, wherein the over voltage register, the normal state register and the low voltage register are
configured to determine whether to store the estimating electrical-capacity signal controlled by the over voltage enable signal,
the normal state enable signal and the low voltage enable signal respectively,

wherein the electrical-capacity calculation circuit is configured to determine the SOC of the battery using a signal stored
in the normal state register and a signal stored in the low voltage register, and

wherein the electrical-capacity calculation circuit is configured to determine the SOH of the battery using a signal stored
in the over voltage register and the signal stored in the low voltage register.