Method and terminal for displaying battery power

• US 10,345,382 B2
• Filed: 12/15/2014
• Issued: 07/09/2019
• Est. Priority Date: 12/28/2012
• Status: Active Grant

• Current Assignee: Huawei Device Company Limited (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Device Company Limited (Huawei Investment & Holding Co., Ltd.)
• Inventors: Wang, Guanglin
• Primary Examiner(s): Parker, Kenneth
• Assistant Examiner(s): Gauthier, Steven B
• Application Number:
  US14/569,843
• Publication Number:
  US 20150100261A1
• Time in Patent Office: 1,667 Days
• CPC Class Codes: G01R 31/3646 for indicating electrical conditions or variables, e.g. visual or audible indicators
• CPC Class Codes: G01R 31/3648 comprising digital calculation means, e.g. for performing an algorithm
• CPC Class Codes: G01R 31/371 with remote indication, e.g. on external chargers
• CPC Class Codes: G01R 31/382 Arrangements for monitoring battery or accumulator variables, e.g. SoC
• CPC Class Codes: G01R 31/3842 combining voltage and current measurements

Abstract

A method and a related terminal for displaying battery power to improve accuracy of displaying battery power. The method includes acquiring a power increase of a battery according to a preset time interval when the battery enters a charging state, where the battery has completed discharging before entering the charging state, acquiring power stored in the battery and an open circuit voltage OCV of the battery at a time when the acquired power increase of the battery reaches a preset threshold, generating an Open Circuit Voltage-State Of Capacity (OCV-SOC) curve according to the acquired power stored in the battery and the acquired OCV when the battery completes charging, and displaying the battery power according to the generated OCV-SOC curve.

Claims

1. A method for displaying battery power, comprising:

receiving charging current at a battery between a first time at which the battery is fully discharged and a second time at which the battery is fully charged, wherein the charging current charges the battery, and the battery is charged without interruption between the first time and the second time;

determining, while the battery is receiving the charging current between the first time and the second time, a power increase of the battery at a first plurality of times according to a preset time interval;

detecting, at a second plurality of the first plurality of times and while the battery is receiving the charging current between the first time and the second time, a power stored in the battery, a voltage of the battery, and a current of the battery, the second plurality of times corresponding to each time, of the first plurality of times, at which the power increase of the battery reaches a preset threshold;

responsive to completing charging of the battery without interruption of the charging between the first time and the second time, determining open circuit voltages (OCVs) of the battery based on the voltage of the battery and the current of the battery detected at the second plurality of times;

calculating a total capacity of the battery according to the power stored in the battery when the battery completes charging;

generating, when the battery completes charging at the second time without interruption of the charging between the first time and the second time, an Open Circuit Voltage-State Of Capacity (OCV-SOC) curve according to the total capacity of the battery, the power stored in the battery that is detected at the second plurality of times, and the OCVs determined based on the voltage of the battery and the current of the battery detected at the second plurality of times and while the battery is charging; and

displaying a battery power that is derived from the generated OCV-SOC curve.

2. The method of claim 1, wherein the power stored in the battery is detected using a coulomb meter.

3. The method of claim 1, wherein generating the OCV-SOC curve comprises:

dividing the total capacity of the battery into multiple power levels; and

establishing a mapping relationship between each of the multiple power levels and a respective OCV of the power level to generate the OCV-SOC curve.

4. The method of claim 1, wherein the method further comprises:

acquiring a temperature parameter of the battery between the first time and the second time; and

after generating the OCV-SOC curve, using the generated OCV-SOC curve to replace a second OCV-SOC curve that is saved in a terminal to which the battery belongs, wherein the second OCV-SOC curve corresponds to the temperature parameter.

5. The method of claim 1, wherein detecting the voltage of the battery and the current of the battery at the second plurality of times comprises detecting a second voltage of the battery and a second current of the battery at a fourth time between the first and second times and following a third time at which a first voltage of the battery and a first current of the battery are detected, the third time is between the first time and the second time, and the method further comprises determining an internal resistance of the battery based the first voltage, the first current, the second voltage, and the second current.

6. The method claim 5, wherein determining the OCVs includes determining a first OCV for the third time based on the first voltage, the first current, and the determined internal resistance.

7. A terminal, comprising:

a battery configured to store power;

a processor coupled to the battery and configured to;

acquire, while the battery is being charged without interruption between a first time at which the battery is fully discharged and a second time at which the battery is fully charged, a power increase of the battery at a first plurality of times between the first time and the second time according to a preset time interval;

acquire, at a second plurality of the first plurality of times and while the battery is being charged between the first time and the second time, the power stored in the battery, a voltage of the battery, and a current of the battery, the second plurality of times corresponding to each time, of the first plurality of times, at which the power increase of the battery reaches a preset threshold;

responsive to completing charging of the battery without interruption of the charging between the first time and the second time, determine open circuit voltages (OCVs) of the battery based on the voltage of the battery and the current of the battery acquired at the second plurality of times;

calculate a total capacity of the battery according to the power stored in the battery when the battery completes charging;

generate, when the battery completes charging at the second time without interruption of the charging between the first time and the second time, an Open Circuit Voltage-State Of Capacity (OCV-SOC) curve according to the total capacity of the battery, the power stored in the battery that is acquired at the second plurality of times, and the OCVs determined based on the voltage of the battery and the current of the battery acquired at the second plurality of times and while the battery is charging; and

a display coupled to the processor and configured to display a battery power that is derived from the OCV-SOC curve.

8. The terminal of claim 7, further comprising a coulomb meter configured to determine the power increase of the battery at the first plurality of times according to the preset time interval, wherein the processor is configured to acquire the power increase at the first plurality of times from the coulomb meter.

9. The terminal of claim 7, wherein, to generate the OCV-SOC curve, the processor is configured to:

divide the total capacity of the battery into multiple power levels; and

establish a mapping relationship between each of the multiple power levels and a respective OCV of the power level to generate the OCV-SOC curve.

10. The terminal of claim 7, wherein the processor is further configured to:

acquire a temperature parameter of the battery between the first time and the second time; and

use the generated OCV-SOC curve to replace a second OCV-SOC curve that is saved in the terminal, wherein the second OCV-SOC curve corresponds to the temperature parameter.

11. The terminal of claim 7, wherein the processor is configured to acquire the voltage of the battery and the current of the battery at the second plurality of times by being configured to detect a second voltage of the battery and a second current of the battery at a fourth time between the first and second times and following a third time at which a first voltage of the battery and a first current of the battery are detected, the third time is between the first time and the second time, and the processor is further configured to determine an internal resistance of the battery based the first voltage, the first current, the second voltage, and the second current.

12. The terminal of claim 11, wherein the processor is further configured to determine the OCVs by being configured to determine a first OCV for the third time based on the first voltage, the first current, and the determined internal resistance.

13. A computer readable storage medium storing a program that, when executed by a computer, causes the computer to:

receive charging current at a battery between a first time at which the battery is fully discharged and a second time at which the battery is fully charged, wherein the charging current charges the battery, and the battery is charged without interruption between the first time and the second time;

determine, while the battery is receiving the charging current between the first time and the second time, a power increase of the battery at a first plurality of times according to a preset time interval;

detect, at a second plurality of the first plurality of times and while the battery is receiving the charging current between the first time and the second time, a power stored in the battery, a voltage of the battery, and a current of the battery, the second plurality of times corresponding to each time, of the first plurality of times, at which the power increase of the battery reaches a preset threshold;

responsive to completing charging of the battery without interruption of the charging between the first time and the second time, determine open circuit voltages (OCVs) of the battery based on the voltage of the battery and the current of the battery detected at the second plurality of times;

calculate a total capacity of the battery according to the power stored in the battery when the battery completes charging;

generate, when the battery completes charging at the second time without interruption of the charging between the first time and the second time, an Open Circuit Voltage-State Of Capacity (OCV-SOC) curve according to the total capacity of the battery, the power stored in the battery that is detected at the second plurality of times, and the OCVs determined based on the voltage of the battery and the current of the battery detected at the second plurality of times and while the battery is charging; and

cause a display to display a battery power that is derived from the generated OCV-SOC curve.