Charging method and mobile terminal

• US 10,389,155 B2
• Filed: 04/29/2016
• Issued: 08/20/2019
• Est. Priority Date: 12/03/2015
• Status: Active Grant

• Current Assignee: Guangdong OPPO Mobile Telecommunications Corporation Limited
• Original Assignee: Guangdong OPPO Mobile Telecommunications Corporation Limited
• Inventors: Deng, Nanwei
• Primary Examiner(s): Berhanu, Samuel
• Application Number:
  US15/561,140
• Publication Number:
  US 20180048163A1
• Time in Patent Office: 1,208 Days
• Field of Search: 320160, 320162
• CPC Class Codes: H02J 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• CPC Class Codes: H02J 7/0071 with a programmable schedule

Abstract

A charging method and a mobile terminal are provided. The method includes setting an initial cut-off voltage and an initial charging current of a battery when the battery is subjected to constant current charging. The initial cut-off voltage is greater than a safe cut-off voltage of the battery. A battery voltage of the battery is detected. Whether a present value of the battery voltage is equal to the initial cut-off voltage is determined. The initial cut-off voltage and the initial charging current are gradually decreased when the present value of the battery voltage is equal to the initial cut-off voltage, until the initial cut-off voltage is less than or equal to the safe cut-off voltage, and then the battery is subjected to a constant voltage charging, where a voltage of the constant voltage charging is the safe cut-off voltage.

Claims

1. A charging method, comprising:

setting an initial cut-off voltage and an initial charging current of a battery when the battery is subjected to constant current charging, wherein the initial cut-off voltage is greater than a safe cut-off voltage of the battery, and a difference between the initial cut-off voltage and the safe cut-off voltage is less than or equal to a preset voltage difference;

detecting a battery voltage of the battery;

determining whether a present value of the battery voltage is equal to the initial cut-off voltage; and

gradually decreasing the initial cut-off voltage and the initial charging current when the present value of the battery voltage is equal to the initial cut-off voltage, until the initial cut-off voltage is less than or equal to the safe cut-off voltage, and then the battery is subjected to a constant voltage charging, wherein a voltage of the constant voltage charging is the safe cut-off voltage.

2. The charging method according to claim 1, wherein gradually decreasing the initial cut-off voltage and the initial charging current until the initial cut-off voltage is less than or equal to the safe cut-off voltage, and then the battery is subjected to the constant voltage charging, comprises:

decreasing the initial cut-off voltage by a first preset value to function as a present cut-off voltage, and decreasing the initial charging current by a second preset value to function as a present charging current.

3. The charging method according to claim 1, wherein the method further comprises:

continuously determining whether the present value of the battery voltage is equal to the initial cut-off voltage when the present value of the battery voltage is unequal to the initial cut-off voltage.

4. The charging method according to claim 2, wherein the difference between the initial cut-off voltage and the safe cut-off voltage is K times of the first preset value, where K is a positive integer.

5. The charging method according to claim 1, wherein setting the initial cut-off voltage and the initial charging current of the battery comprises:

detecting the safe cut-off voltage of the battery;

setting the initial cut-off voltage of the battery based on a mapping relationship between the safe cut-off voltage and the initial cut-off voltage; and

setting the initial charging current of the battery based on a mapping relationship between the initial cut-off voltage and the initial charging current.

6. The charging method according to claim 2, wherein the method further comprises:

continuously determining whether the present value of the battery voltage is equal to the present cut-off voltage when the present value of the battery voltage is unequal to the present cut-off voltage.

13. The charging method according to claim 2, wherein gradually decreasing the initial cut-off voltage and the initial charging current until the initial cut-off voltage is less than or equal to the safe cut-off voltage, and then the battery is subjected to the constant voltage charging, further comprises:

determining whether the present cut-off voltage is greater than the safe cut-off voltage;

determining whether the present value of the battery voltage is equal to the present cut-off voltage when the present cut-off voltage is greater than the safe cut-off voltage; and

decreasing the present cut-off voltage by the first preset value to function as a new present cut-off voltage and decreasing the present charging current by the second preset value to function as a new present charging current when the present value of the battery voltage is equal to the present cut-off voltage, and determining whether the present cut-off voltage is greater than the safe cut-off voltage until the present cut-off voltage is less than or equal to the safe cut-off voltage, and then the battery is subjected to the constant voltage charging.

7. An apparatus comprising:

a processor, a memory, and a battery, wherein the memory is configured to store executable program instructions;

the processor configured to execute the executable program instructions performing following operations;

setting an initial cut-off voltage and an initial charging current of a battery when the battery is subjected to constant current charging, wherein the initial cut-off voltage is greater than a safe cut-off voltage of the battery;

determining whether a present value of a battery voltage of the battery is equal to the initial cut-off voltage; and

gradually decreasing the initial cut-off voltage and the initial charging current when the present value of the battery voltage is equal to the initial cut-off voltage, until the initial cut-off voltage is less than or equal to the safe cut-off voltage, and then the battery is subjected to a constant voltage charging, wherein a voltage of the constant voltage charging is the safe cut-off voltage.

8. The apparatus according to claim 7, wherein gradually decreasing the initial cut-off voltage and the initial charging current until the initial cut-off voltage is less than or equal to the safe cut-off voltage, and then the battery is subjected to the constant voltage charging, comprises that the processor is configured to execute the executable program instructions performing following operations:

decreasing the initial cut-off voltage by a first preset value to function as a present cut-off voltage, and decreasing the initial charging current by a second preset value to function as a present charging current.

9. The apparatus according to claim 7, wherein the processor is configured to execute the executable program instructions performing following operation:

continuously determine whether the present value of the battery voltage is equal to the initial cut-off voltage when the present value of the battery voltage is unequal to the initial cut-off voltage.

10. The apparatus according to claim 8, wherein the difference between the initial cut-off voltage and the safe cut-off voltage is K times of the first preset value, where K is a positive integer.

11. The apparatus according to claim 7, wherein the processor is configured to set the initial cut-off voltage and the initial charging current of the battery comprising:

detecting the safe cut-off voltage of the battery;

setting the initial cut-off voltage of the battery based on a mapping relationship between the safe cut-off voltage and an initial cut-off voltage; and

setting the initial charging current of the battery based on a mapping relationship between the initial cut-off voltage and the initial charging current.

12. The apparatus according to claim 8, wherein the processor is configured to execute the executable program instructions performing following operation:

continuously determine whether the present value of the battery voltage is equal to the present cut-off voltage when the present value of the battery voltage is unequal to the present cut-off voltage.

14. The apparatus according to claim 7, wherein a difference between the initial cut-off voltage and the safe cut-off voltage is less than or equal to a preset voltage difference.

15. The apparatus according to claim 8, wherein gradually decreasing the initial cut-off voltage and the initial charging current until the initial cut-off voltage is less than or equal to the safe cut-off voltage, and then the battery is subjected to the constant voltage charging, comprises that the processor is configured to execute the executable program instructions performing following operations:

determining whether the present cut-off voltage is greater than the safe cut-off voltage;

determining whether the present value of the battery voltage is equal to the present cut-off voltage when the present cut-off voltage is greater than the safe cut-off voltage; and

decreasing the present cut-off voltage by the first preset value to function as a new present cut-off voltage and decreasing the present charging current by the second preset value to function as a new present charging current when the present value of the battery voltage is equal to the present cut-off voltage, and determining whether the present cut-off voltage is greater than the safe cut-off voltage until the present cut-off voltage is less than or equal to the safe cut-off voltage, and then the battery is subjected to the constant voltage charging.

16. A charging method, comprising:

setting a first cut-off voltage and a charging current of a battery when the battery is subjected to constant current charging, wherein the first cut-off voltage is greater than a second cut-off voltage of the battery;

determining that a present value of a battery voltage of the battery is equal to the first cut-off voltage; and

decreasing the first cut-off voltage and the charging current, until the first cut-off voltage is less than or equal to the second cut-off voltage, and then the battery is subjected to a constant voltage charging using the second cut-off voltage.

17. The charging method according to claim 16, wherein decreasing the first cut-off voltage and the charging current, until the first cut-off voltage is less than or equal to the second cut-off voltage, and then the battery is subjected to the constant voltage charging using the second cut-off voltage, comprises:

decreasing the first cut-off voltage by a first preset value to function as a present cut-off voltage, and decreasing the charging current by a second preset value to function as a present charging current;

determining that the present cut-off voltage is greater than the second cut-off voltage;

determining that the present value of the battery voltage is equal to the present cut-off voltage; and

decreasing the present cut-off voltage by the first preset value to function as a new present cut-off voltage and decreasing the present charging current by the second preset value to function as a new present charging current when the present value of the battery voltage is equal to the present cut-off voltage, and performing the constant voltage charging of the battery by determining that the present cut-off voltage is less than or equal to the second cut-off voltage.

18. The charging method according to claim 17, wherein the difference between the first cut-off voltage and the second cut-off voltage is K times of the first preset value, where K is a positive integer.

19. The charging method according to claim 16, wherein setting the first cut-off voltage and the charging current of the battery comprises:

detecting the second cut-off voltage of the battery;

setting the first cut-off voltage of the battery based on a mapping relationship between the second cut-off voltage and the first cut-off voltage; and

setting the charging current of the battery based on a mapping relationship between the first cut-off voltage and the charging current.

20. The charging method according to claim 16, wherein a difference between the initial cut-off voltage and the safe cut-off voltage is less than or equal to a preset voltage difference.