CA2636664A1 - System and method for battery capacity reporting - Google Patents
System and method for battery capacity reporting Download PDFInfo
- Publication number
- CA2636664A1 CA2636664A1 CA002636664A CA2636664A CA2636664A1 CA 2636664 A1 CA2636664 A1 CA 2636664A1 CA 002636664 A CA002636664 A CA 002636664A CA 2636664 A CA2636664 A CA 2636664A CA 2636664 A1 CA2636664 A1 CA 2636664A1
- Authority
- CA
- Canada
- Prior art keywords
- capacity
- battery
- state
- available capacity
- available
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/3644—Constructional arrangements
- G01R31/3648—Constructional arrangements comprising digital calculation means, e.g. for performing an algorithm
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3828—Arrangements for monitoring battery or accumulator variables, e.g. SoC using current integration
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
- H02J7/80—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries including monitoring or indicating arrangements
- H02J7/82—Control of state of charge [SOC]
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
A method and system for accurately reporting battery capacity is disclosed herein. The disclosed method and system prevent the reporting of discontinuous capacity values resulting from starting or stopping recharge cycles. The disclosed method and system prevent over or under reporting of battery capacity due to the transition between charge and discharge curves in a battery model.
Claims (33)
1. A method of determining an available capacity of a rechargeable battery, comprising:
storing a battery capacity model, the battery capacity model including a first set of data and a second set of data, the first set of data relating battery voltage to available capacity when the battery is charging, the second set of data relating battery voltage to available capacity when the battery is discharging;
measuring a battery voltage;
determining if the battery is charging or discharging;
if the battery is charging, then using the first set of data from the battery capacity model to determine the available capacity from the measured battery voltage;
and if the battery is discharging, then using the second set of data from the battery capacity model to determine the available capacity from the measured battery voltage.
storing a battery capacity model, the battery capacity model including a first set of data and a second set of data, the first set of data relating battery voltage to available capacity when the battery is charging, the second set of data relating battery voltage to available capacity when the battery is discharging;
measuring a battery voltage;
determining if the battery is charging or discharging;
if the battery is charging, then using the first set of data from the battery capacity model to determine the available capacity from the measured battery voltage;
and if the battery is discharging, then using the second set of data from the battery capacity model to determine the available capacity from the measured battery voltage.
2. The method of claim 1, wherein the first set of data represents a charge curve and the second set of data represents a discharge curve.
3. The method of claim 1, further comprising: reporting the available capacity to a user.
4. The method of claim 1, further comprising:
detecting a change in state of the rechargeable battery between a discharge state and a charge state;
if the detected state change is from the charge state to the discharge state, then reporting only decreases in the available capacity until another state change is detected;
and if the detected state change is from the discharge state to the charge state, then reporting only increases in the available capacity until another state change is detected.
detecting a change in state of the rechargeable battery between a discharge state and a charge state;
if the detected state change is from the charge state to the discharge state, then reporting only decreases in the available capacity until another state change is detected;
and if the detected state change is from the discharge state to the charge state, then reporting only increases in the available capacity until another state change is detected.
5. The method of claim 1, further comprising:
measuring a battery current; and correcting the measured battery voltage based at least in part on the measured battery current and an effective serial resistance;
wherein the available capacity is determined based on the corrected battery voltage.
measuring a battery current; and correcting the measured battery voltage based at least in part on the measured battery current and an effective serial resistance;
wherein the available capacity is determined based on the corrected battery voltage.
6. The method of claim 1, further comprising:
measuring an ambient temperature of the battery;
correcting the measured battery voltage based at least in part on the measured ambient temperature;
wherein the available capacity is determined based on the corrected battery voltage.
measuring an ambient temperature of the battery;
correcting the measured battery voltage based at least in part on the measured ambient temperature;
wherein the available capacity is determined based on the corrected battery voltage.
7. A mobile communication device, comprising:
a rechargeable battery;
a memory device storing a battery capacity model, the battery capacity model including a first set of data and a second set of data, the first set of data relating battery voltage to available capacity when the rechargeable battery is charging, the second set of data relating battery voltage to available capacity when the rechargeable battery is discharging;
a charging subsystem configured to measure a battery voltage of the rechargeable battery, and determine if the rechargeable battery is charging or discharging;
the charging subsystem being further configured to use the first set of data from the battery capacity model to determine the available capacity from the measured battery voltage if the rechargeable battery is charging, and use the second set of data from the battery capacity model to determine the available capacity from the measured battery voltage if the rechargeable battery is discharging.
a rechargeable battery;
a memory device storing a battery capacity model, the battery capacity model including a first set of data and a second set of data, the first set of data relating battery voltage to available capacity when the rechargeable battery is charging, the second set of data relating battery voltage to available capacity when the rechargeable battery is discharging;
a charging subsystem configured to measure a battery voltage of the rechargeable battery, and determine if the rechargeable battery is charging or discharging;
the charging subsystem being further configured to use the first set of data from the battery capacity model to determine the available capacity from the measured battery voltage if the rechargeable battery is charging, and use the second set of data from the battery capacity model to determine the available capacity from the measured battery voltage if the rechargeable battery is discharging.
8. The mobile communication device of claim 7, wherein the first set of data represents a charge curve and the second set of data represents a discharge curve.
9. The mobile communication device of claim 7, further comprising: a user interface configured to report the available capacity to a user.
10. The mobile communication device of claim 9, wherein:
the charging subsystem is further configured to detect a change in state of the rechargeable battery between a discharge state and a charge state;
if the detected state change is from the charge state to the discharge state, then the user interface reporting only decreases in the available capacity until another state change is detected; and if the detected state change is from the discharge state to the charge state, then the user interface reporting only increases in the available capacity until another state change is detected.
the charging subsystem is further configured to detect a change in state of the rechargeable battery between a discharge state and a charge state;
if the detected state change is from the charge state to the discharge state, then the user interface reporting only decreases in the available capacity until another state change is detected; and if the detected state change is from the discharge state to the charge state, then the user interface reporting only increases in the available capacity until another state change is detected.
11. The mobile communication device of claim 7, further comprising:
circuitry for measuring a battery current;
wherein the charging subsystem is further configured to correct the measured battery voltage based at least in part on the measured battery current and an effective serial resistance;
wherein the available capacity is determined based on the corrected battery voltage.
circuitry for measuring a battery current;
wherein the charging subsystem is further configured to correct the measured battery voltage based at least in part on the measured battery current and an effective serial resistance;
wherein the available capacity is determined based on the corrected battery voltage.
12. The mobile communication device of claim 7, further comprising:
circuitry for measuring an ambient temperature of the battery;
wherein the charging subsystem is further configured to correct the measured battery voltage based at least in part on the measured ambient temperature;
wherein the available capacity is determined based on the corrected battery voltage.
circuitry for measuring an ambient temperature of the battery;
wherein the charging subsystem is further configured to correct the measured battery voltage based at least in part on the measured ambient temperature;
wherein the available capacity is determined based on the corrected battery voltage.
13. A mobile communication device, comprising:
means for storing a battery capacity model, the battery capacity model including a first set of data and a second set of data, the first set of data relating battery voltage to available capacity when the battery is charging, the second set of data relating battery voltage to available capacity when the battery is discharging;
means for measuring a battery voltage;
means for determining if the battery is charging or discharging;
means for using the first set of data from the battery capacity model to determine the available capacity from the measured battery voltage if the battery is charging; and means for using the second set of data from the battery capacity model to determine the available capacity from the measured battery voltage if the battery is discharging.
means for storing a battery capacity model, the battery capacity model including a first set of data and a second set of data, the first set of data relating battery voltage to available capacity when the battery is charging, the second set of data relating battery voltage to available capacity when the battery is discharging;
means for measuring a battery voltage;
means for determining if the battery is charging or discharging;
means for using the first set of data from the battery capacity model to determine the available capacity from the measured battery voltage if the battery is charging; and means for using the second set of data from the battery capacity model to determine the available capacity from the measured battery voltage if the battery is discharging.
14. A method for reporting an available capacity of a rechargeable battery, comprising:
reporting the available capacity of the rechargeable battery based on a measured battery voltage;
detecting a change in state of the rechargeable battery between a discharge state and a charge state;
if the detected state change is from the charge state to the discharge state, then reporting only decreases in the available capacity until another state change is detected;
and if the detected state change is from the discharge state to the charge state, then reporting only increases in the available capacity until another state change is detected.
reporting the available capacity of the rechargeable battery based on a measured battery voltage;
detecting a change in state of the rechargeable battery between a discharge state and a charge state;
if the detected state change is from the charge state to the discharge state, then reporting only decreases in the available capacity until another state change is detected;
and if the detected state change is from the discharge state to the charge state, then reporting only increases in the available capacity until another state change is detected.
15. The method of claim 14, wherein the available capacity is determine from the measured battery voltage using a capacity model.
16. The method of claim 15, wherein:
if the rechargeable battery is in the discharge state, then the available capacity is determined using a discharge curve from the capacity model; and if the rechargeable battery is in the charge state, then the available capacity is determined using a charge curve from the capacity model.
if the rechargeable battery is in the discharge state, then the available capacity is determined using a discharge curve from the capacity model; and if the rechargeable battery is in the charge state, then the available capacity is determined using a charge curve from the capacity model.
17. The method of claim 14, further comprising:
if the detected state change is from the charge state to the discharge state and a determined value of the available capacity has increased from a last reported capacity, then continuing to report the last reported capacity; and if the detected state change is from the discharge state to the charge state and the determined value of the available capacity has decreased from the last reported capacity, then continuing to report the last reported capacity.
if the detected state change is from the charge state to the discharge state and a determined value of the available capacity has increased from a last reported capacity, then continuing to report the last reported capacity; and if the detected state change is from the discharge state to the charge state and the determined value of the available capacity has decreased from the last reported capacity, then continuing to report the last reported capacity.
18. The method of claim 14, wherein the determination as to whether the available capacity is increasing or decreasing is made by comparing a candidate capacity with a last reported capacity.
19. The method of claim 14, wherein the measured battery voltage is corrected based on a measured battery current and an effective serial resistance, and wherein the reported available capacity is determined based on the corrected measured battery voltage.
20. The method of claim 19, wherein the measured battery voltage is further corrected to compensate for temperature fluctuations.
21. A method for reporting an available capacity of a rechargeable battery, comprising:
reporting the available capacity of the rechargeable battery based on a measured battery voltage;
detecting a change in state of the rechargeable battery between a discharge state and a charge state;
if the detected state change is from the charge state to the discharge state, then using a fast convergence rate to report the battery available capacity if the measured battery voltage is decreasing and using a slow convergence rate to report the available battery capacity if the measured battery voltage is increasing; and if the detected state change is from the discharge state to the charge state, then using the fast convergence rate to report the available battery capacity if the measured battery voltage is increasing and using the slow convergence rate to report the available battery capacity if the measured battery voltage is decreasing.
reporting the available capacity of the rechargeable battery based on a measured battery voltage;
detecting a change in state of the rechargeable battery between a discharge state and a charge state;
if the detected state change is from the charge state to the discharge state, then using a fast convergence rate to report the battery available capacity if the measured battery voltage is decreasing and using a slow convergence rate to report the available battery capacity if the measured battery voltage is increasing; and if the detected state change is from the discharge state to the charge state, then using the fast convergence rate to report the available battery capacity if the measured battery voltage is increasing and using the slow convergence rate to report the available battery capacity if the measured battery voltage is decreasing.
22. The method of claim 21, further comprising:
if the slow convergence rate is to be used to report the available battery capacity, then first determining if a target battery capacity to be reported using the slow convergence rate is within a play range of a last reported capacity, and if the target battery capacity is not within the play range, then continuing to report the last reported capacity.
if the slow convergence rate is to be used to report the available battery capacity, then first determining if a target battery capacity to be reported using the slow convergence rate is within a play range of a last reported capacity, and if the target battery capacity is not within the play range, then continuing to report the last reported capacity.
23. The method of claim 21, wherein the available capacity is determine from the measured battery voltage using a capacity model.
24. The method of claim 23, wherein:
if the rechargeable battery is in the discharge state, then the available capacity is determined using a discharge curve from the capacity model; and if the rechargeable battery is in the charge state, then the available capacity is determined using a charge curve from the capacity model.
if the rechargeable battery is in the discharge state, then the available capacity is determined using a discharge curve from the capacity model; and if the rechargeable battery is in the charge state, then the available capacity is determined using a charge curve from the capacity model.
25. The method of claim 22, wherein the play range is determined as a function of the state of the rechargeable battery and the last reported capacity.
26. The method of claim 21, wherein the measured battery voltage is corrected based on a measured battery current and an effective serial resistance, and wherein the reported available capacity is determined based on the corrected measured battery voltage.
27. The method of claim 26, wherein the measured battery voltage is further corrected to compensate for temperature fluctuations.
28. A handheld device having a system for reporting an available capacity of a rechargeable battery, comprising:
a charging subsystem configured to determining the available capacity of the rechargeable battery based on a measured battery voltage;
a user interface configured to report the available capacity;
the charging subsystem being further configured to detect a change in state of the rechargeable battery between a discharge state and a charge state;
wherein if the detected state change is from the charge state to the discharge state, then the charging subsystem being configured to report only decreases in the available capacity until another state change is detected; and wherein if the detected state change is from the discharge state to the charge state, then the charging subsystem being configured to report only increases in the available capacity until another state change is detected.
a charging subsystem configured to determining the available capacity of the rechargeable battery based on a measured battery voltage;
a user interface configured to report the available capacity;
the charging subsystem being further configured to detect a change in state of the rechargeable battery between a discharge state and a charge state;
wherein if the detected state change is from the charge state to the discharge state, then the charging subsystem being configured to report only decreases in the available capacity until another state change is detected; and wherein if the detected state change is from the discharge state to the charge state, then the charging subsystem being configured to report only increases in the available capacity until another state change is detected.
29. The handheld device of claim 28, wherein if the detected state change is from the charge state to the discharge state and a determined value of the available capacity has increased from a last reported capacity, then the charging subsystem being configured to continue reporting the last reported capacity; and if the detected state change is from the discharge state to the charge state and the determined value of the available capacity has decreased from the last reported capacity, then the charging subsystem being configured to continue reporting the last reported capacity.
30. The handheld device of claim 28, wherein the charging subsystem determines whether the available capacity is increasing or decreasing by comparing a candidate capacity with a last reported capacity.
31. A handheld device having a system for reporting an available capacity of a rechargeable battery, comprising:
a charging subsystem configured to determining the available capacity of the rechargeable battery based on a measured battery voltage;
a user interface configured to report the available capacity;
the charging subsystem being further configured to detect a change in state of the rechargeable battery between a discharge state and a charge state;
wherein if the detected state change is from the charge state to the discharge state, then the charging subsystem being configured to use a fast convergence rate to report the battery available capacity if the measured battery voltage is decreasing and to use a slow convergence rate to report the available battery capacity if the measured battery voltage is increasing; and wherein if the detected state change is from the discharge state to the charge state, then the charging subsystem being configured to use the fast convergence rate to report the available battery capacity if the measured battery voltage is increasing and to use the slow convergence rate to report the available battery capacity if the measured battery voltage is decreasing.
a charging subsystem configured to determining the available capacity of the rechargeable battery based on a measured battery voltage;
a user interface configured to report the available capacity;
the charging subsystem being further configured to detect a change in state of the rechargeable battery between a discharge state and a charge state;
wherein if the detected state change is from the charge state to the discharge state, then the charging subsystem being configured to use a fast convergence rate to report the battery available capacity if the measured battery voltage is decreasing and to use a slow convergence rate to report the available battery capacity if the measured battery voltage is increasing; and wherein if the detected state change is from the discharge state to the charge state, then the charging subsystem being configured to use the fast convergence rate to report the available battery capacity if the measured battery voltage is increasing and to use the slow convergence rate to report the available battery capacity if the measured battery voltage is decreasing.
32. The handheld device of claim 31, wherein if the slow convergence rate is to be used to report the available battery capacity, then the charging subsystem being configured to determine if a target battery capacity to be reported using the slow convergence rate is within a play range of a last reported capacity, and if the target battery capacity is not within the play range, then continuing to report the last reported capacity.
33. The handheld device of claim 32, wherein the play range is determined as a function of the state of the rechargeable battery and the last reported capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2766337A CA2766337C (en) | 2001-07-05 | 2002-07-03 | System and method for battery capacity reporting |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US30312901P | 2001-07-05 | 2001-07-05 | |
| US60/303,129 | 2001-07-05 | ||
| CA002392182A CA2392182C (en) | 2001-07-05 | 2002-07-03 | System and method for battery capacity reporting |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002392182A Division CA2392182C (en) | 2001-07-05 | 2002-07-03 | System and method for battery capacity reporting |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2766337A Division CA2766337C (en) | 2001-07-05 | 2002-07-03 | System and method for battery capacity reporting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2636664A1 true CA2636664A1 (en) | 2003-01-05 |
| CA2636664C CA2636664C (en) | 2012-04-10 |
Family
ID=23170663
Family Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2766337A Expired - Lifetime CA2766337C (en) | 2001-07-05 | 2002-07-03 | System and method for battery capacity reporting |
| CA2636664A Expired - Lifetime CA2636664C (en) | 2001-07-05 | 2002-07-03 | System and method for battery capacity reporting |
| CA002392182A Expired - Lifetime CA2392182C (en) | 2001-07-05 | 2002-07-03 | System and method for battery capacity reporting |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2766337A Expired - Lifetime CA2766337C (en) | 2001-07-05 | 2002-07-03 | System and method for battery capacity reporting |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002392182A Expired - Lifetime CA2392182C (en) | 2001-07-05 | 2002-07-03 | System and method for battery capacity reporting |
Country Status (2)
| Country | Link |
|---|---|
| US (3) | US6794852B2 (en) |
| CA (3) | CA2766337C (en) |
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2002
- 2002-07-03 CA CA2766337A patent/CA2766337C/en not_active Expired - Lifetime
- 2002-07-03 CA CA2636664A patent/CA2636664C/en not_active Expired - Lifetime
- 2002-07-03 US US10/189,714 patent/US6794852B2/en not_active Expired - Lifetime
- 2002-07-03 CA CA002392182A patent/CA2392182C/en not_active Expired - Lifetime
-
2004
- 2004-09-16 US US10/942,546 patent/US6982544B2/en not_active Expired - Lifetime
-
2005
- 2005-11-01 US US11/264,216 patent/US7301305B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CA2766337C (en) | 2013-02-12 |
| US20050029988A1 (en) | 2005-02-10 |
| CA2766337A1 (en) | 2003-01-05 |
| US20030008202A1 (en) | 2003-01-09 |
| CA2636664C (en) | 2012-04-10 |
| CA2392182A1 (en) | 2003-01-05 |
| US6982544B2 (en) | 2006-01-03 |
| CA2392182C (en) | 2008-11-04 |
| US6794852B2 (en) | 2004-09-21 |
| US7301305B2 (en) | 2007-11-27 |
| US20060049805A1 (en) | 2006-03-09 |
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| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20220704 |