Terminal device, method for monitoring battery safety of terminal device

Patent metadata

Field	Value
Publication number	US-11522357-B2
Application number	US-201916372795-A
Country	US
Kind code	B2
Filing date	Apr 2, 2019
Priority date	Aug 25, 2017
Publication date	Dec 6, 2022
Grant date	Dec 6, 2022

Abstract

A terminal device, a method for monitoring battery safety of a terminal device, and a system for monitoring battery safety of a terminal device are provided. The method for monitoring battery safety includes the following. Acquire status information of a battery of the terminal device. Determine whether the terminal device meets a preset safety hazard condition according to the status information. Upon determining that the terminal device meets the preset safety hazard condition, control the terminal device to be in a power-off state or disconnect a power supply circuit.

First claim

What is claimed is:

1. A method for monitoring battery safety of a terminal device, comprising:
acquiring status information of a battery of the terminal device, wherein the status information comprises at least two of:
power-failure information generated upon disconnection between a battery connector of the terminal device and a main board of the terminal device;
whether a sudden change in voltage occurs to the battery and whether a battery surface has an abnormal temperature area;
a duration of a constant-voltage charging stage during charging of the battery;
charging capacity and discharging capacity of the battery;
capacities of the battery before and after dropping; and
a voltage decrease rate after the battery is fully charged;

determining whether the terminal device meets a preset safety hazard condition according to the status information; and
controlling the terminal device to be in a power-off state or disconnecting a power supply circuit upon determining that the terminal device meets the preset safety hazard condition;
wherein the preset safety hazard condition comprises at least two of the following:
the disconnection between the battery connector and the main board is a private disconnection;
the sudden change in voltage occurs to the battery and the battery surface has the abnormal temperature area;
the duration of the constant-voltage charging stage during charging of the battery is longer than or equal to a preset duration;
a charging-discharging capacity difference of the battery is not within a preset capacity range;
a capacity difference before and after dropping is not within the preset capacity range; and
the voltage decrease rate after the battery is fully charged is greater than or equal to a preset rate;
wherein the disconnection between the battery connector and the main board is determined to be the private disconnection according to the power-failure information;
wherein power-failure state bit information is generated upon the disconnection between the battery connector and the main board and is taken as the power-failure information, wherein it is determined that the disconnection between the battery connector and the main board is the private disconnection, upon determining that the power-failure state bit information is not reset or is not marked.

2. The method of claim 1 , wherein charging current and charging voltage of the battery are restricted and the terminal device is controlled to send alert information indicative of battery abnormality during charging of the battery, when any one of the preset safety hazard condition is met.

3. The method of claim 1 , wherein it is determined that the sudden change in voltage occurs to the battery and the battery surface has the abnormal temperature area, when an instant drop in voltage occurs to the battery and a temperature of any one of a plurality of areas of the battery is higher than that of any other area of the battery, wherein the battery surface is divided into the plurality of areas.

4. The method of claim 3 , wherein it is determined that the instant drop in voltage occurs to the battery according to an output signal of a differential amplifying circuit.

5. The method of claim 1 , wherein the charging-discharging capacity difference of the battery is obtained by one of:
acquiring the charging capacity when the battery is charged from a first state of charge (SOC) value to a second SOC value, acquiring the discharging capacity when the battery is discharged from the second SOC value to the first SOC value, and acquiring the charging-discharging capacity difference of the battery according to the charging capacity and the discharging capacity; and
acquiring the charging capacity when the battery is charged from a first voltage to a second voltage, acquiring the discharging capacity when the battery is discharged from the second voltage to the first voltage, and acquiring the charging-discharging capacity difference of the battery according to the charging capacity and the discharging capacity.

6. A terminal device, comprising:
a battery;
a controller, configured to:
acquire status information of the battery, wherein the status information comprises at least two of:
power-failure information generated upon disconnection between a battery connector of the terminal device and a main board of the terminal device;
whether a sudden change in voltage occurs to the battery and whether a battery surface has an abnormal temperature area;
a duration of a constant-voltage charging stage during charging of the battery;
charging capacity and discharging capacity of the battery;
capacities of the battery before and after dropping; and
a voltage decrease rate after the battery is fully charged;

determine whether the terminal device meets a preset safety hazard condition according to the status information; and
control the terminal device to be in a power-off state or disconnecting a power supply circuit upon determining that the terminal device meets the preset safety hazard condition;

wherein the preset safety hazard condition comprises at least two of the following:
the disconnection between the battery connector and the main board is a private disconnection;
the sudden change in voltage occurs to the battery and the battery surface has the abnormal temperature area;
the duration of the constant-voltage charging stage during charging of the battery is longer than or equal to a preset duration;
a charging-discharging capacity difference of the battery is not within a preset capacity range;
a capacity difference before and after dropping is not within the preset capacity range; and
the voltage decrease rate after the battery is fully charged is greater than or equal to a preset rate;
wherein the disconnection between the battery connector and the main board is determined to be the private disconnection according to the power-failure information;
wherein power-failure state bit information is generated upon the disconnection between the battery connector and the main board and is taken as the power-failure information, wherein it is determined that the disconnection between the battery connector and the main board is the private disconnection, upon determining that the power-failure state bit information is not reset or is not marked.

7. The terminal device of claim 6 , wherein charging current and charging voltage of the battery are restricted and the terminal device is controlled to send alert information indicative of battery abnormality during charging of the battery, when any one of the preset safety hazard condition is met.

8. The terminal device of claim 6 , further comprising a differential amplifying circuit, wherein the differential amplifying circuit comprises:
a differential amplifier X 1 , having a positive input end also coupled with a positive electrode of the battery;
a first resistor R 1 , having one end coupled with a negative input end of the differential amplifier X 1 and the other end grounded;
a second resistor R 2 , having one end coupled with the positive electrode of the battery and the other end coupled with the negative input end of the differential amplifier X 1 ; and
a capacitor C 1 , coupled in parallel with the first resistor R 1 .

9. The terminal device of claim 8 , wherein it is determined that an instant drop in voltage occurs to the battery according to an output signal of the differential amplifying circuit.

10. The terminal device of claim 9 , wherein it is determined that the sudden change in voltage occurs to the battery and the battery surface has the abnormal temperature area, when the instant drop in voltage occurs to the battery and a temper

Assignees

• Guangdong Oppo Mobile Telecommunications Corp Ltd

Inventors

• Chen Wei
• Hu Zhihua
• Zhang Hui
• Zhang Jialiang
• Chen Shebiao

Classifications

• H02J7/663

  using battery or load disconnect circuits (H02J9/002 takes precedence) · CPC title

• H02J7/65

  against overtemperature · CPC title

• H02J7/80

  including monitoring or indicating arrangements · CPC title

• H02J7/60 Primary

  including safety or protection arrangements · CPC title

• H01M10/488

  Cells or batteries combined with indicating means for external visualization of the condition, e.g. by change of colour or of light density · CPC title