Methods and apparatus for managing a battery system

1. An apparatus capable of connecting to a battery and a signal converter, wherein the battery and signal converter are connected with a power line and the signal converter generates data according to a sensor, comprising:

a fuel gauge circuit configured to connect to the power line and receive data from the signal converter, wherein the fuel gauge circuit comprises:

a memory configured to store a first voltage threshold and a second voltage threshold;

a voltage sensor configured to measure a voltage of the power line;

a noise detection circuit in communication with the memory and the voltage sensor, wherein the noise detection circuit is configured to:

compute a change in voltage based on the measured voltage;

determine a level of noise on the power line based on the computed change in voltage;

compare the change in voltage to the first voltage threshold value; and

compare the change in voltage to the second voltage threshold value, wherein the second threshold value is greater than the first threshold value; and

a data processor responsive to the noise detection circuit and configured to:

process the data based on the level of noise on the power line; and

control at least one of: operation of the sensor and the data, based on the level of noise on the power line,

wherein, to process the data based on the level of noise on the power line, the data processor is further configured to adjust a sampling rate of the received data based on the comparisons of the change in voltage to the first voltage threshold and the second voltage threshold.

2. The apparatus according to claim 1 , wherein processing the data comprises averaging all the received data if the change in voltage is less than the first threshold value.

3. The apparatus according to claim 1 , wherein processing the data comprises averaging only a portion of the received data if:

the change in voltage is greater than the first threshold value; and

the change in voltage is less than the second threshold value.

4. The apparatus according to claim 1 , wherein processing the data comprises rejecting the received data if the change in voltage is greater than the second threshold value.

5. The apparatus according to claim 1 , wherein the data processor is further configured to transmit a control signal to the sensor if the change in voltage is greater than the second threshold value; wherein the control signal prevents operation of the sensor.

6. The apparatus according to claim 1 , wherein the fuel gauge circuit further comprises an application processor responsive to the data processor and configured to calculate at least one of: a state of health of the battery, a state of function of the battery, and a state of charge of the battery based on the processed data.

7. The apparatus according to claim 1 , wherein the memory is further configured to store:

internal resistance values of the battery as a function of temperature and remaining capacity of the battery; and

open circuit voltage values as a function of remaining capacity.

8. The apparatus according to claim 7 , wherein the fuel gauge is further configured to:

detect a temperature of the battery;

determine a remaining capacity of the battery;

select an internal resistance value from the memory according to the remaining capacity and detected temperature;

compute a current of the power line using the selected internal resistance value and the measured voltage; and

compute a change in current based on the computed current and a previously-computed current.

9. A method for operating a battery system having a power line that connects a battery to a signal converter, wherein the signal converter generates data according to a sensor, comprising:

detecting noise on the power line comprising:

detecting a change in voltage on the power line;

detecting a change in current on the power line;

comparing the change in voltage to a first noise threshold and a second noise threshold; and

comparing the change in current to a third noise threshold and a fourth noise threshold;

reporting detected noise on the power line comprising:

generating a first notification signal if the change in voltage is greater than the first and second noise thresholds; and

generating a second notification signal if the change in current is greater than the third and fourth noise thresholds; and

controlling at least one of the sensor and the data in response to at least one of the first notification signal and second notification signal.

10. The method according to claim 9 , further comprising measuring a temperature of the battery and determining an internal resistance of the battery based on the measured temperature.

11. The method according to claim 10 , further comprising adjusting the first, second, third, and fourth noise threshold according to the determined internal resistance.

12. The method according to claim 9 , wherein controlling the sensor comprises disabling operation of the sensor in response to at least one of the first notification signal and second notification signal.

13. The method according to claim 9 , wherein controlling the data comprises preventing use of the data in response to at least one of the first notification signal and second notification signal.

14. A system, comprising:

a battery;

a power line connecting the battery to a signal converter, wherein the signal converter generates data according to a sensor; and

a fuel gauge circuit connected to the power line and configured to:

receive data from the signal converter;

measure a voltage of the power line;

compute a change in voltage based on the measured voltage;

compute a change in current of the power line based on the measured voltage;

determine a level of noise on the power line based on the computed change in current and the computed change in current voltage;

report detected noise on the power line; and

control at least one of the sensor and the data in response to the reported noise.

15. The system according to claim 14 , wherein the processor determines the level of noise on the power line comprising:

comparing the change in voltage to a first noise threshold and a second noise threshold; and

comparing the change in current to a third noise threshold and a fourth noise threshold.

16. The system according to claim 15 , wherein the processor reports noise on the power line comprising:

generating a first notification signal if the change in voltage is greater than the first and second noise thresholds; and

generating a second notification signal if the change in current is greater than the third and fourth noise thresholds.

17. The system according to claim 16 , wherein:

controlling the sensor comprises disabling operation of the sensor in response to at least one of the first notification signal and second notification signal; and

controlling the data comprises preventing use of the data in response to at least one of the first notification signal and second notification signal.

18. The system according to claim 14 , wherein the fuel gauge circuit further comprises a memory configured to store:

internal resistance values of the battery as a function of temperature and remaining capacity of the battery; and

open circuit voltage values as a function of remaining capacity.

19. The system according to claim 18 , wherein the fuel gauge circuit is configured to:

detect a temperate of the battery;

determine a remaining capacity;

select an internal resistance value from the memory according to the remaining capacity;

compute a current of the power line using the selected internal resistance value, one open circuit voltage value, and the measured voltage; and

compute the change in current based on the computed current and a previously-computed current.