WO2017201737A1

WO2017201737A1 - Battery protecting board, battery, and mobile terminal

Info

Publication number: WO2017201737A1
Application number: PCT/CN2016/083694
Authority: WO
Inventors: 田晨; 张加亮
Original assignee: 广东欧珀移动通信有限公司
Priority date: 2016-05-27
Filing date: 2016-05-27
Publication date: 2017-11-30
Also published as: CN106471700A; CN106471700B

Abstract

Provided in embodiments of the present invention are a battery protecting board, a battery, and a mobile terminal. The battery protecting board comprises: a protection circuit connected to a charging/discharging circuit in a battery in a mobile terminal, the protection circuit is used for controlling the turning on and off of the charging/discharging circuit; and a battery level gauge, one extremity of the battery level gauge is connected at a first position of the charging/discharging circuit, the other extremity of the battery level gauge is connected to a second position of the charging/discharging circuit, the first position is located in the battery protecting board, the second position is located in a mainboard of the mobile terminal, the first position is connected to the second position via a lead, during the process in which the battery is being charged or discharged via the charging/discharging circuit, and the battery level gauge detects a voltage drop produced by the impedance of the lead and determines the power level of the battery on the basis of the voltage drop. The embodiments of the present invention not only reduce the number of components in the battery protecting board, thus saving the area for board layout and costs for the battery protecting board, and reducing the failure rate of the battery protecting board, but also reduce the heat produced by the battery protecting board.

Description

Battery protection board, battery and mobile terminal

Technical field

Embodiments of the present invention relate to the field of mobile terminals, and, more particularly, to a battery protection board, a battery, and a mobile terminal.

Background technique

At present, mobile terminals (such as smart phones) are increasingly favored by consumers, and the security of mobile terminals has become the focus of users.

In order to ensure the safety of the battery inside the mobile terminal, it is necessary to install a battery protection board for the battery. The structure of the existing battery protection board is various, and the mobile terminal has special requirements on the integration and volume of the battery protection board. Therefore, it is urgent to provide a battery protection board suitable for the mobile terminal.

Summary of the invention

The present application provides a battery protection board and a battery suitable for a mobile terminal, and provides a mobile terminal.

According to a first aspect, a battery protection board includes: a protection circuit connected to a charge and discharge circuit of a battery in a mobile terminal, wherein the protection circuit is configured to control conduction and shutdown of the charge and discharge circuit; One end of the battery fuel gauge is connected to the first position of the charging and discharging circuit, and the other end of the battery fuel gauge is connected to the second position of the charging and discharging circuit, and the first position is located at the battery protection In the board, the second position is located in a main board of the mobile terminal, and the first position and the second position are connected by wires, and the battery is charged and discharged through the charging and discharging circuit. And the battery fuel gauge detects a voltage drop generated by the impedance of the wire, and determines the amount of power of the battery according to the voltage drop.

In a second aspect, a battery is provided, comprising a battery cell, and a battery protection plate as described in the first aspect, the battery protection plate being coupled to the battery cell.

In a third aspect, a mobile terminal is provided, comprising a charging interface, such as the battery described in the second aspect, and a main board, wherein the battery is connected to the charging interface.

In some implementations, the battery protection board further includes: a temperature detecting circuit for detecting a temperature of the battery; the battery fuel gauge is connected to the temperature detecting circuit, and the battery fuel gauge is specifically used for : according to the temperature detected by the temperature detecting circuit, and the temperature and the guide Corresponding relationship of the impedance (or resistance) of the line, determining the impedance of the wire (ie, determining the impedance of the wire at a temperature detected by the temperature detecting circuit); according to the impedance of the wire, and the pressure generated by the impedance Down, determining the current flowing through the wire; determining the amount of power of the battery based on the current flowing through the wire.

In some implementations described above, the battery fuel gauge includes the temperature detection circuit.

In some implementations, the protection circuit includes: a field effect transistor, the field effect transistor is located in the charge and discharge circuit; and a controller, the controller is connected to the field effect transistor (eg, with a field effect) The gate of the tube) controls conduction and shutdown of the charge and discharge circuit through the field effect transistor.

In some implementations described above, the battery fuel gauge is coupled to the second location by a connector between the battery protection panel and the motherboard.

In some implementations, the protection circuit is a first protection circuit in the battery protection board, and the battery protection board further includes: a second protection circuit, the second protection circuit, and the charge and discharge circuit Connected, overvoltage and/or overcurrent protection of the charge and discharge circuit by a fuse.

In some implementations described above, the mobile terminal supports a normal charging mode and a fast charging mode, wherein the charging speed of the fast charging mode is greater than the charging speed of the normal charging mode.

In some implementations described above, the charging current of the fast charging mode is greater than the charging current of the normal charging mode.

In some implementations described above, the charging voltage of the fast charging mode is greater than the charging voltage of the normal charging mode.

In some implementations described above, in the fast charging mode, the mobile terminal performs two-way communication with an adapter through the charging interface.

It should be understood that the battery fuel gauge may include two current detecting points, one end of the battery fuel gauge may be a first current detecting point of the battery fuel gauge, and the other end of the battery fuel gauge may be a second current detecting point of the battery fuel gauge .

The battery protection board provided by the present application can not only reduce the number of devices in the battery protection board, but also save the layout area and the cost of the battery protection board, reduce the failure rate of the battery protection board, and reduce the heat generation of the battery protection board.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings to be used in the embodiments of the present invention will be briefly described below. Obviously, the drawings described below are only Some embodiments of the invention may also be used to obtain other figures from these figures without departing from the art.

1 is a schematic circuit diagram of a battery protection board.

2 is a schematic circuit diagram of a battery protection board according to an embodiment of the present invention.

FIG. 3 is a schematic diagram showing the connection relationship between the battery protection board and the main board according to the embodiment of the present invention.

4 is a schematic circuit diagram of a battery protection board according to an embodiment of the present invention.

Fig. 5 is a schematic structural view of a battery according to an embodiment of the present invention.

FIG. 6 is a schematic structural diagram of a mobile terminal according to an embodiment of the present invention.

detailed description

1 is a schematic circuit diagram of a battery protection board. The battery protection panel 10 of Figure 1 includes:

The protection circuit 11 is connected to the charge and discharge circuit 13 of the battery in the mobile terminal, and the protection circuit 11 is used to control the on and off of the charge and discharge circuit 13;

The current detecting resistor 14 is connected in series in the charging and discharging circuit 13;

The battery fuel gauge 15 is connected to both ends of the current detecting resistor 14. During the charging and discharging of the battery through the charging and discharging circuit, the battery fuel gauge 15 detects the voltage drop generated by the impedance of the current detecting resistor 14, and according to the The voltage drop determines the battery's charge.

In some embodiments, the protection circuit 11 of FIG. 1 includes a control IC 16 and a pair of back-to-back MOS transistors T1 and T2, which are connected to the MOS transistor T1 and the MOS transistor T2 through the Cout terminal and the Dout terminal, respectively.

In some embodiments, the Cout terminal can be an overcharge control terminal that controls the switching of the MOS transistor through the gate voltage of the MOS transistor T2.

In some embodiments, the Dout terminal can be an over-discharge, over-current, or short-circuit control terminal that controls the switching of the MOS transistor through the gate voltage of the MOS transistor T1.

In some embodiments, P+ and P- represent the positive and negative electrodes of the battery protection panel 10, respectively. Alternatively, P+ and P- represent the positive and negative electrodes of the battery cell 12 which are taken out through the battery protection plate 10, respectively.

The size of mobile terminals is getting smaller and smaller, and the integration requirements for circuits are getting higher and higher. The battery protection board in the scheme not only integrates the protection circuit, but also integrates the battery fuel gauge, and has high integration degree, which is suitable for application inside the mobile terminal and provides protection for the battery of the mobile terminal.

In the prior art, the battery protection board is generally sealed in the battery together with the battery core. Due to the limited volume of the battery, the area of the battery protection board is relatively small, resulting in poor heat dissipation of the battery protection board.

The integration scheme can be improved by using the scheme of FIG. 1. However, since the current-sense resistor 14 generally has a small area and generates a large amount of heat, the heat generation phenomenon of the battery protection board 10 may be further aggravated. Therefore, the resistor for current detection may be considered. The area is increased to reduce the amount of heat generated by the battery protection panel 10.

In order to achieve this, the impedance of the wire in the charge and discharge circuit can be used instead of the current-sense resistor, and the area of the wire is larger than the area of the special resistance element, so that the heat generated by the resistor can be better dissipated.

However, as mentioned above, the battery protection board is generally packaged in a small-sized battery. The area of the protection board itself is small. If the resistance of a certain wire of the current loop in the battery protection board is used instead of the current-sense resistor The area of the resistor may still be relatively small, and the heat generated by it may not be dissipated in time.

In order to increase the area of the wire in the current loop instead of the current-sense resistor as much as possible, as shown in FIG. 2, a current detecting point of the battery fuel gauge can be connected to the current loop of the battery protection board, and the battery fuel gauge is additionally A current detecting point is connected to the current loop of the main board through a connector between the battery protection board and the main board of the mobile terminal (it is to be noted that the broken line in FIG. 2 indicates the current detecting line of the battery fuel gauge). This can ensure that the area of the wire is large enough, and the generated heat can be dissipated in time, thereby reducing the heat generation of the battery protection board.

The impedance of the intercepted wire can be calculated or simulated. After the impedance of the wire is obtained, the battery protection board and the main board can be connected together, and then an external power source is used to add a constant current to the current loop to calibrate the impedance of the wire, thereby ensuring the battery fuel gauge. Check flow accuracy.

Further, the impedance of the wire may change as the temperature of the battery or battery protection plate changes. In the case where the current-sense resistor 14 is replaced with this wire, in order to be able to more accurately measure the current flowing through the wire, in some embodiments, a temperature detecting circuit may be added to the battery protection plate 10.

Specifically, referring to FIG. 3, the battery protection board may further include: a temperature detecting circuit 18 for detecting the temperature of the battery or the battery protection board; the battery fuel gauge 15 may be connected to the temperature detecting circuit 18, and the battery fuel gauge 15 may be specifically used for: According to the temperature detected by the temperature detecting circuit 18, and the correspondence between the temperature and the impedance of the wire (the correspondence may be stored in advance in the memory of the battery protection board 10), determining the impedance of the wire at the current temperature; The current flowing through the wire is sensed based on the impedance of the wire at the current temperature; the amount of electricity is determined based on the current flowing through the wire.

In some embodiments, the temperature detection circuit can be integrated in a battery fuel gauge. In some embodiments, the temperature detection circuit can be provided separately from the battery fuel gauge.

In some embodiments, the temperature sensing circuit can detect the temperature through the thermistor. In some embodiments, the thermistor may be a Negative Temperature Coefficient (NTC) resistor or a Possitive Temperature Coefficient (PTC) resistor. In some embodiments, one end of the thermistor is connected to the positive pole P+ of the battery protection plate by a pull-up resistor.

The protection circuit 11 may be the first protection circuit in the battery protection board 10. In order to further improve the protection performance of the battery protection board, optionally, in some embodiments, referring to FIG. 4, the battery protection board 10 may further include: The second protection circuit 21 and the second protection circuit 21 can provide protection for the charging and discharging process of the battery in case of failure of the protection circuit.

In some embodiments, the second protection circuit 21 can provide overvoltage or overcurrent protection for the charge and discharge process of the battery through the fuse. As shown in FIG. 4, the second protection circuit 21 may include a first fuse pin F1 and a second fuse pin F2. When an overvoltage or overcurrent occurs in the charge and discharge circuit, the second protection circuit 21 is located at the The fuse between the fuse pin F1 and the second fuse pin F2 is blown.

By setting up a two-stage protection circuit, the safety of the battery charging and discharging process in the mobile terminal is further improved.

The battery protection panel of the embodiment of the present invention has been described in detail above with reference to FIGS. 1 through 4. The battery and the mobile terminal of the embodiment of the present invention will be described in detail below with reference to FIGS. 5 and 6.

Fig. 5 is a schematic structural view of a battery according to an embodiment of the present invention. The battery 500 of Figure 5 includes:

Battery 510;

A battery protection board 520 is connected to the battery core 510.

It should be understood that the battery protection board 520 in FIG. 5 can adopt the battery protection board described above, and to avoid repetition, it will not be described in detail herein.

FIG. 6 is a schematic structural diagram of a mobile terminal according to an embodiment of the present invention. The mobile terminal 600 of FIG. 6 includes:

Charging interface 610;

A battery 500 is connected to the charging interface 610.

Optionally, as an embodiment, the mobile terminal 600 may support a normal charging mode and a fast charging mode, wherein the charging speed of the fast charging mode is greater than the charging speed of the normal charging mode.

Optionally, as an embodiment, the charging current of the fast charging mode is greater than the normal charging mode. The charging current.

Optionally, as an embodiment, in the fast charging mode, the mobile terminal 600 performs bidirectional communication with the adapter through the charging interface 610.

The embodiment of the present invention does not specifically limit the communication process between the mobile terminal and the adapter. For example, the communication between the mobile terminal and the adapter may refer to the handshake process of the two parties, that is, the mobile terminal and the adapter determine the charging mode, the charging voltage, and the charging by shaking hands. Current and other parameters.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods for implementing the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.

A person skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

The functions may be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a standalone product. Based on such understanding, the technical solution of the present invention is essentially or a part contributing to the prior art or a part of the technical solution. The points may be embodied in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform various embodiments of the present invention All or part of the steps of the method. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

The above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the appended claims.

Claims

A battery protection board, comprising:

a protection circuit connected to a charge and discharge circuit of a battery in the mobile terminal, wherein the protection circuit is configured to control conduction and shutdown of the charge and discharge circuit;

a battery fuel gauge, one end of the battery fuel gauge is connected to the first position of the charging and discharging circuit, and the other end of the battery fuel gauge is connected to the second position of the charging and discharging circuit, the first position is located at the In the battery protection board, the second position is located in a main board of the mobile terminal, and the first position and the second position are connected by wires, and the battery is charged and discharged through the charging and discharging circuit. During the process, the battery fuel gauge detects a voltage drop generated by the impedance of the wire and determines the amount of power of the battery based on the voltage drop.
The battery protection board according to claim 1, wherein the battery protection board further comprises:

a temperature detecting circuit for detecting a temperature of the battery;

The battery fuel gauge is connected to the temperature detecting circuit, and the battery fuel gauge is specifically used for:

Determining an impedance of the wire according to a temperature detected by the temperature detecting circuit and a correspondence between a temperature and an impedance of the wire;

Determining a current flowing through the wire according to an impedance of the wire and a voltage drop generated by the impedance;

The amount of electricity of the battery is determined based on the current flowing through the wire.
A battery protection panel according to claim 2, wherein said battery fuel gauge comprises said temperature detecting circuit.
The battery protection board according to any one of claims 1 to 3, wherein the protection circuit comprises:

a field effect transistor, the field effect transistor being located in the charge and discharge circuit;

And a controller connected to the FET, and the FET is controlled to be turned on and off by the FET.
The battery protection panel according to any one of claims 1 to 4, wherein the battery fuel gauge is connected to the second position by a connector between the battery protection panel and the main board.
The battery protection board according to any one of claims 1 to 5, wherein the protection circuit is a first protection circuit in the battery protection board, and the battery protection board further comprises:

a second protection circuit connected to the charge and discharge circuit and overvoltage and/or overcurrent protection of the charge and discharge circuit by a fuse.
A battery, comprising:

Batteries;

A battery protection panel according to any one of claims 1 to 6, wherein the battery protection panel is connected to the battery cell.
A mobile terminal, comprising:

Charging interface

The battery of claim 7 wherein said battery is coupled to said charging interface;

The motherboard.
The mobile terminal of claim 8, wherein the mobile terminal supports a normal charging mode and a fast charging mode, wherein a charging speed of the fast charging mode is greater than a charging speed of the normal charging mode.
The mobile terminal of claim 9, wherein the charging current of the fast charging mode is greater than the charging current of the normal charging mode.
The mobile terminal of claim 9, wherein the charging voltage of the fast charging mode is greater than the charging voltage of the normal charging mode.
The mobile terminal according to any one of claims 8 to 11, wherein in the fast charging mode, the mobile terminal performs two-way communication with an adapter through the charging interface.