WO2017201734A1

WO2017201734A1 - Battery protection board, battery, and mobile terminal

Info

Publication number: WO2017201734A1
Application number: PCT/CN2016/083691
Authority: WO
Inventors: 杨波; 张俊
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: CN106463991A; CN106463991B

Abstract

Embodiments of the present invention provide a battery protection board, a battery, and a mobile terminal. The battery protection board comprises: protection circuits located in a charging/discharging loop of a mobile terminal; and detection circuits connected with the protection circuits. In a process that a battery is charged or discharged via the charging/discharging loop, the detection circuits are used for: detecting a voltage drop generated by impedance of at least part of the protection circuits, and determining a charging or discharging current of the charging/discharging loop according to the impedance of the at least part of the protection circuits and the voltage drop.

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

With the rapid development of the mobile communication field, the computing processing capability of the mobile terminal has multiplied, and at the same time, the power consumption of the mobile terminal has also increased accordingly. In order to ensure the continuous endurance of the mobile terminal, the battery capacity of the mobile terminal is increasing. In order to quickly fill large-capacity batteries, various fast charging technologies have emerged.

Overcharge, overdischarge, short circuit, etc. can seriously damage the battery life and even threaten the safety of users. In order to avoid these phenomena, a battery protection board is generally provided inside the battery to provide safety protection for charging and discharging of the battery.

The battery protection board is prone to heat, and with the development of fast charging technology, the large charging current causes the heating phenomenon of the battery protection board to become more and more serious. The battery is very sensitive to temperature, and the heat of the battery protection board will affect the service life of the battery. Therefore, the problem of heat generation of the battery protection board needs to be solved.

Summary of the invention

The application provides a battery protection board, a battery and a mobile terminal to reduce the heat generation of the battery protection board.

A first aspect provides a battery protection board for a mobile terminal, including: a protection circuit, the protection circuit is located in a charging and discharging circuit of the mobile terminal; and a detection circuit, the detection circuit is connected to the protection circuit, During the charging and discharging of the battery through the charging and discharging circuit, the detecting circuit is configured to: detect a voltage drop generated by an impedance of at least part of the circuit in the protection circuit; according to an impedance of the at least part of the circuit, and The voltage drop determines a charging current or a discharging current of the charging and discharging circuit.

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; and a battery as described in the second aspect, the battery being connected to the charging interface.

In some implementations, the detecting circuit is further configured to: determine, according to a charging current or a discharging current of the charging and discharging circuit, whether an abnormality occurs in a charging and discharging process of the battery; and an abnormality occurs in the charging and discharging process. In this case, the charge and discharge circuit is controlled to be disconnected by the protection circuit.

In some implementations, the detecting circuit is further configured to: detect a temperature of the battery protection board; determine the at least part according to a temperature of the battery protection board and a pre-stored correspondence between temperature and impedance The impedance of the circuit.

In some implementations described above, the protection circuit includes a first protection circuit and a second protection circuit, the detection circuit includes a first detection circuit and a second detection circuit, and the first detection circuit passes the first protection The circuit controls on and off of the charging and discharging circuit; the second detecting circuit controls on and off of the charging and discharging circuit by the second protection circuit; wherein the second protection circuit is capable of being in the first protection circuit The charging and discharging process of the battery is protected in the event of failure.

In some implementations, the first detecting circuit is connected to both ends of the first protection circuit, and the first detecting circuit is specifically configured to detect a voltage drop generated by an impedance of the first protection circuit, and Determining a charging current or a discharging current of the charging and discharging circuit according to an impedance of the first protection circuit and a voltage drop generated by an impedance of the first protection circuit; the second detecting circuit and the second protection circuit The two detecting circuits are specifically configured to detect a voltage drop generated by the impedance of the second protection circuit, and generate the voltage according to the impedance of the second protection circuit and the impedance of the second protection circuit. The voltage drop determines the charging current or the discharging current of the charging and discharging circuit.

In some implementations, the first detecting circuit is connected to both ends of the first protection circuit, and the first detecting circuit is specifically configured to detect a voltage drop generated by an impedance of the first protection circuit, and Determining a charging current or a discharging current of the charging and discharging circuit according to an impedance of the first protection circuit and a voltage drop generated by an impedance of the first protection circuit; two of the second detecting circuit and the protection circuit Connected to the end, the second detecting circuit is specifically configured to detect a voltage drop generated by the impedance of the protection circuit, and determine the charging and discharging according to the impedance of the protection circuit and the voltage drop generated by the impedance of the protection circuit. The charging current or discharge current of the loop.

In some implementations, the first detecting circuit is connected to both ends of the protection circuit, and the first detecting circuit is specifically configured to detect a voltage drop generated by an impedance of the protection circuit, and according to the protection Determining a charging current or a discharging current of the charging and discharging circuit by an impedance of the circuit and a voltage drop generated by the impedance of the protection circuit; the second detecting circuit is connected to both ends of the protection circuit, and the second detecting The circuit is specifically configured to detect a voltage drop generated by an impedance of the protection circuit, and determine the charge and discharge according to an impedance of the protection circuit and a voltage drop generated by an impedance of the protection circuit The charging current or discharge current of the loop.

In some implementations, the first detecting circuit is connected to both ends of the protection circuit, and the first detecting circuit is specifically configured to detect a voltage drop generated by an impedance of the protection circuit, and according to the protection Determining a charging current or a discharging current of the charging and discharging circuit by an impedance of the circuit and a voltage drop generated by the impedance of the protection circuit; the second detecting circuit is connected to both ends of the second protection circuit, the The second detecting circuit is configured to detect a voltage drop generated by the impedance of the second protection circuit, and determine the charging and discharging circuit according to the impedance of the second protection circuit and the voltage drop generated by the impedance of the second protection circuit Charge current or discharge current.

In some implementations, the first detecting circuit is further configured to detect a battery voltage of the mobile terminal; and the second detecting circuit is further configured to detect a cell voltage of the mobile terminal.

In some implementations described above, the impedance of the at least a portion of the circuitry includes an impedance of the copper traces, the copper traces being copper traces of the impedance design.

In some of the above implementations, the abnormality of the charge and discharge process of the battery includes at least one of the following: overcharging, overdischarging, and shorting of the battery.

In some implementations, the determining whether an abnormality occurs in the charging and discharging process of the battery according to the charging current or the discharging current of the charging and discharging circuit may include: charging current or discharging current of the charging and discharging circuit The comparison may be performed with a preset current threshold (the thresholds of the charging current and the discharging current may be the same or different); when the charging current or the discharging current is greater than the current threshold, it is determined that an abnormality occurs in the charging and discharging process of the battery.

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.

By replacing the special impedance device with the impedance of at least part of the circuit in the protection circuit, the total impedance of the battery protection board can be reduced, thereby reducing 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. It is obvious that the drawings described below are only some embodiments of the present invention, Those skilled in the art can also obtain other drawings based on these drawings without paying any creative work.

1 is a diagram showing an example of a control chip in a detection circuit of an embodiment of the present invention.

2 is a diagram showing an example of a protection circuit of an embodiment of the present invention.

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

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

FIG. 5 is a circuit diagram of a battery protection board according to an embodiment of the present invention.

Fig. 6 is a circuit diagram of a battery protection board according to an embodiment of the present invention.

Fig. 7 is a schematic structural view of a battery according to an embodiment of the present invention.

FIG. 8 is a schematic structural diagram of a mobile terminal according to an embodiment of the present invention.

detailed description

The battery protection board generally includes a detection circuit and a protection circuit, and the detection circuit detects whether an abnormality occurs in the charging and discharging process of the battery, such as whether overcharge, overdischarge, and short circuit occur. If an abnormality occurs, the charge and discharge circuit of the battery can be controlled to be disconnected by the protection circuit.

The detection circuit generally detects whether an abnormality has occurred in the charging and discharging process of the battery by measuring a voltage drop (or a pressure difference). Specifically, in the prior art, an impedance device dedicated to voltage drop is generally connected in series on the charge and discharge circuit, and then the detection circuit determines whether the battery is charged or discharged abnormally by detecting a voltage drop across the impedance device ( For example, the charge and discharge current is measured by a voltage drop, and then the charge and discharge current is compared with a current threshold). The heat generated by the battery protection board itself is already very large. After introducing these impedance devices, the overall impedance of the battery protection board is further increased. According to P=I ² R (P is thermal power, I is current, R is impedance), This causes the battery protection board to heat up more seriously.

In order to reduce the heat generation of the battery protection board, the impedance of the existing device in the battery protection board can be used instead of the special impedance device, so that it is not necessary to introduce a special impedance device, so that the overall impedance of the battery protection board is lowered.

In some embodiments, during charging and discharging, the detecting circuit can detect a voltage drop caused by an impedance of at least a portion of the circuits in the protection circuit, that is, by replacing the special impedance device with the impedance of at least part of the circuits in the protection circuit, Thereby reducing the heat generation of the battery protection board.

It should be understood that the number of detection circuits and protection circuits in the battery protection board is not in the embodiment of the present invention. Be specifically limited. In some embodiments, the battery protection board may include a detection circuit and a protection circuit; in some embodiments, the battery protection board may include two detection circuits, and two protections corresponding to the two detection circuits in one-to-one correspondence Circuitry; In some embodiments, the battery protection board can include more detection circuitry and protection circuitry. The battery protection board with dual protection mechanism is taken as an example to describe the form and function of each circuit in the battery protection board in detail.

The battery protection board having the dual protection mechanism may include: a first protection circuit for performing first weight protection, and a first detection circuit corresponding to the first protection protection circuit; a second protection circuit for performing second protection, and The second detection circuit corresponding to the second protection circuit.

In some embodiments, the first protection circuit can implement conduction and shutdown of the charge and discharge circuit according to the detection result of the first detection circuit, and such protection can be a basic protection of the battery protection board.

In some embodiments, the second protection circuit can implement the conduction and shutdown of the charge and discharge circuit according to the detection result of the second detection circuit, such protection can be more biased toward safety protection, and the protection provided by the second protection circuit can be regarded as It is the last pass of the protection mechanism provided by the battery protection board. In general, the second heavy protection can be triggered after the first heavy protection fails. From a safety point of view, the second protection is very important, because once the second heavy protection is abnormal, there is a high possibility of serious accidents such as battery burning and explosion.

In some embodiments, the first detection circuit can mainly perform one or more of the following functions: detection of battery charging current, detection of battery discharge current, detection of battery voltage, temperature detection of battery protection board, and different temperatures Impedance compensation, etc. Furthermore, the first detection circuit can implement control of the first protection circuit. In some embodiments, the first detection circuit can also have some data processing capabilities. In some embodiments, the first detecting circuit may save the written data or the calculation result. For example, the first detecting circuit may integrate the memory, and the written data or the calculation result may be saved through the memory, such as saving the protection circuit. Data of the correspondence between impedance and temperature.

Specifically, the first detecting circuit may include an integrated circuit (IC) chip, and FIG. 1 shows an example of an IC chip. The IC chip in Figure 1 includes a plurality of pins, and the functions of each pin are shown in the following table. It should be understood that the IC chip in FIG. 1 is only an example, and the pins of the IC chip can be increased or decreased according to actual conditions.

Table 1. Pins and functions of IC chips in the detection circuit

In some embodiments, the first protection circuit can be primarily comprised of a switching device. In some embodiments, the first protection circuit can achieve bidirectional turn-off (ie, turn-off of the charge direction and discharge direction). In some embodiments, the first protection circuit may have a low impedance at turn-on and a high impedance at turn-off. In some embodiments, the first protection circuit can be characterized by repeated turn-on and turn-off. The first protection circuit can be controlled by the first detection circuit.

Specifically, the first protection circuit may adopt a structure as shown in FIG. 2, that is, the on/off of the charge and discharge circuit is realized by a pair of back-to-back Metal Oxide Semiconductor (MOS) tubes. The control end of the MOS tube can be connected to the first detecting circuit, such as the OC and OD pins in Table 1, and the input and output ends of the MOS tube can be connected in series in the charging and discharging circuit of the battery. It should be understood that FIG. 2 is only an example structure of the protection circuit, but the embodiment of the present invention is not limited thereto. In practice, any other switch structure may be employed.

In some embodiments, the second detection circuit can mainly perform one or more of the following functions: battery charging current detection, battery discharge current detection, cell voltage detection, battery protection panel temperature detection, impedance at different temperatures Compensation, etc. The second detection circuit can implement control of the second protection circuit. In some embodiments, the second detection circuit can have some data processing capabilities. In some embodiments, the second detection circuit can save the input data or the calculation result, such as data that preserves the correspondence between the impedance and the temperature in the protection circuit.

In some embodiments, the second detection circuit can be implemented the same as or similar to the first detection circuit. Function, but some parameters or technical indicators of the two can be different. For example, the second detecting circuit can be used to detect the cell voltage to ensure that the cell is not overcharged, but the first detecting circuit can be used to detect the battery voltage; for example, the second detecting circuit can protect the current, voltage, temperature, etc. The value may be slightly larger than the first detection circuit, such that the second detection circuit may continue to take over the protection task of the battery after the first heavy protection fails. In some embodiments, the second detection circuit may have the same or different functions as the first detection circuit, and the two may be redundant or complement each other to realize the protection of the battery, which is not specifically limited in the embodiment of the present invention.

The second detecting circuit may include an IC chip as shown in FIG. 1 , through which the protection of the battery charging and discharging process is realized, and the specific description of the IC chip is as described above.

In some embodiments, the second protection circuit can be primarily comprised of a switching device. In some embodiments, the second protection circuit can achieve bidirectional turn-off (ie, turn-off of the charge direction and discharge direction). In some embodiments, the second protection circuit may have a low impedance at turn-on and a high impedance at turn-off. In some embodiments, the second protection circuit can be characterized by repeated turn-on and turn-off. The second protection circuit can be controlled by the second detection circuit.

Specifically, the second protection circuit can adopt the structure as shown in FIG. 2, that is, the on/off of the battery charge and discharge circuit is realized by a pair of back-to-back MOS tubes. The control end of the MOS tube can be connected to the second detecting circuit, for example, connected to the OC and OD pins in Table 1, and the input and output ends of the MOS tube can be connected in series in the charging and discharging circuit of the battery. It should be understood that FIG. 2 is only an example structure of the protection circuit, but the embodiment of the present invention is not limited thereto. In practice, any other switch structure may be employed.

The functions of the respective circuits in the battery protection board having double protection are mainly described above, and the positions and connection relationships of the respective circuits in the battery protection board will be described in detail below with reference to FIGS. 3 to 6. It should be noted that V1 and V2 in FIG. 3 to FIG. 6 respectively indicate the output voltages at the two ends of the cell, but the size relationship between V1 and V2 is not specifically limited in the embodiment of the present invention, and V1-V2>0 or V1 may be used. -V2<0.

3 is a circuit diagram of a battery protection board according to an embodiment of the present invention. In FIG. 3, the first detecting circuit is connected to both ends of the first protection circuit, and the charging current or the discharging current of the charging circuit is determined by detecting the voltage drop generated by the impedance in the first protection circuit. The second detecting circuit is connected to both ends of the second protection circuit, and the charging current or the discharging current of the charging circuit is determined by detecting a voltage drop generated by the impedance in the second protection circuit. Such an arrangement can decouple the first protection circuit and the second protection circuit from each other, and each circuit can be flexibly adjusted according to actual conditions without mutual interference.

4 is a circuit diagram of a battery protection board according to an embodiment of the present invention. In Figure 4, the first test The circuit is connected at both ends of the first protection circuit, and the charging current or the discharging current of the charging circuit is determined by detecting a voltage drop generated by the impedance in the first protection circuit. The second detecting circuit is connected across the entire protection circuit (ie, the first protection circuit and the second protection circuit), and determines a charging current or a discharging current of the charging circuit by detecting a voltage drop generated by the impedance in the entire protection circuit. With such an arrangement, the connection mode of the second detection circuit is more flexible. Moreover, with this arrangement, it is only necessary to ensure that the impedance of the first protection circuit is sufficient for detection, and the second protection circuit can set a lower impedance. In this way, the impedance of the battery protection board can be further reduced, and the heat generation of the battery protection board can be reduced.

FIG. 5 is a circuit diagram of a battery protection board according to an embodiment of the present invention. In FIG. 5, the first detecting circuit is connected across the entire protection circuit (ie, the first protection circuit and the second protection circuit), and the charging current of the charging circuit is determined by detecting a voltage drop generated by the impedance in the entire protection circuit or Discharge current. The second detecting circuit is connected across the entire protection circuit (ie, the first protection circuit and the second protection circuit), and determines a charging current or a discharging current of the charging circuit by detecting a voltage drop generated by the impedance in the entire protection circuit. With such an arrangement, the connection manner of the first detection circuit and the second detection circuit is more flexible. In addition, with this arrangement, both the first protection circuit and the second protection circuit can set a lower impedance to ensure both The sum of the impedances can be used for the voltage drop detection, which can further reduce the impedance of the battery protection board and reduce the heat generation of the battery protection board.

Fig. 6 is a circuit diagram of a battery protection board according to an embodiment of the present invention. In FIG. 6, the first detecting circuit is connected across the entire protection circuit (ie, the first protection circuit and the second protection circuit), and the charging current of the charging circuit is determined by detecting a voltage drop generated by the impedance in the entire protection circuit or Discharge current. The second detecting circuit is connected to both ends of the second protection circuit, and the charging current or the discharging current of the charging circuit is determined by detecting a voltage drop generated by the impedance in the second protection circuit. With such an arrangement, the connection manner of the first detection circuit is more flexible. Moreover, with this arrangement, it is only necessary to ensure that the impedance of the second protection circuit is sufficient for detection, and the first protection circuit can set a lower impedance. In this way, the impedance of the battery protection board can be further reduced, and the heat generation of the battery protection board can be reduced.

The embodiment of the invention replaces the special impedance device by the impedance in the protection circuit, which not only saves the device, reduces the failure rate of the battery protection board, but also reduces the overall impedance of the battery protection board and reduces the heat generation of the battery protection board.

It should be understood that the functions of the first detecting circuit and the second detecting circuit in the above may be the same or different, and they can be flexibly designed with the first protection circuit and the second protection circuit to achieve different effects. fruit.

In addition, in some embodiments, a printed circuit board (PCB) copper trace may be performed in a protection circuit (which may be a first protection circuit, or a second protection circuit, or both). Impedance design. When the impedance of the protection circuit is insufficient, the impedance design of the copper trace can compensate for the problem of insufficient impedance in the protection circuit.

The impedance in the protection circuit may change according to the temperature change of the battery protection board. In order to improve the detection accuracy of the detection circuit, the correspondence relationship between the impedance and the temperature in the protection circuit may be stored in advance, and in actual detection, the battery may be used according to the battery. The temperature of the protection board finds the corresponding impedance and realizes temperature compensation, so that the detection circuit has high detection precision throughout the working temperature range.

It should be understood that the use of the detected charging current or discharging current in the embodiment of the present invention is not specifically limited. In some embodiments, the detecting circuit may determine whether an abnormality occurs in the charging and discharging process of the battery based on the charging current or the discharging current; and control the charging and discharging circuit to be broken by the protection circuit in a case where an abnormality occurs in the charging and discharging process open. In some embodiments, the detecting circuit may send the measured charging current value or the discharging current value to the main board of the mobile terminal, and display the charging current value or the discharging current value on the display screen of the mobile terminal through the main board of the mobile terminal. on.

The battery protection panel of the embodiment of the present invention has been described in detail above with reference to FIGS. 1 through 6. The battery and the mobile terminal of the embodiment of the present invention will be described in detail below with reference to FIGS. 7 and 8.

Fig. 7 is a schematic structural view of a battery according to an embodiment of the present invention. The battery 700 of Figure 7 includes:

Battery 710;

A battery protection board 720 is connected to the battery cell 710.

It should be understood that the battery protection board 720 in FIG. 7 can adopt the battery protection board described above, and to avoid repetition, it will not be described in detail herein.

FIG. 8 is a schematic structural diagram of a mobile terminal according to an embodiment of the present invention. The mobile terminal 800 of FIG. 8 includes:

Charging interface 810;

A battery 700 is connected to the charging interface 810.

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, which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including The instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention. 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, the protection circuit being located in a charge and discharge circuit of the mobile terminal;

a detecting circuit, wherein the detecting circuit is connected to the protection circuit, and in the process of charging and discharging the battery through the charging and discharging circuit, the detecting circuit is configured to:

Detecting a voltage drop generated by an impedance of at least a portion of the circuits in the protection circuit;

Determining a charging current or a discharging current of the charging and discharging circuit according to an impedance of the at least part of the circuit, and the voltage drop.
The battery protection board according to claim 1, wherein said detecting circuit is further configured to:

Determining whether an abnormality occurs in the charging and discharging process of the battery according to a charging current or a discharging current of the charging and discharging circuit;

In the case where an abnormality occurs in the charge and discharge process, the charge and discharge circuit is controlled to be turned off by the protection circuit.
The battery protection board according to claim 1 or 2, wherein the detecting circuit is further configured to:

Detecting a temperature of the battery protection panel;

The impedance of the at least part of the circuit is determined according to the temperature of the battery protection board and the correspondence between the temperature and the impedance stored in advance.
The battery protection board according to any one of claims 1 to 3, wherein the protection circuit comprises a first protection circuit and a second protection circuit, the detection circuit comprising a first detection circuit and a second detection circuit ,

The first detecting circuit controls on and off of the charging and discharging circuit by the first protection circuit;

The second detecting circuit controls the switching of the charging and discharging circuit through the second protection circuit;

Wherein, the second protection circuit can protect the charging and discharging process of the battery in case the first protection circuit fails.
A battery protection panel according to claim 4, wherein

The first detecting circuit is connected to both ends of the first protection circuit, and the first detecting circuit is specifically configured to detect a voltage drop generated by an impedance of the first protection circuit, and according to the first protection circuit Determining, and a voltage drop generated by an impedance of the first protection circuit, determining a charging current or a discharging current of the charging and discharging circuit;

The second detecting circuit is connected to both ends of the second protection circuit, and the second detecting circuit is specifically configured to detect a voltage drop generated by the impedance of the second protection circuit, and according to the second protection circuit The impedance, and the voltage drop generated by the impedance of the second protection circuit, determine a charging current or a discharging current of the charging and discharging circuit.
A battery protection panel according to claim 4, wherein

The first detecting circuit is connected to both ends of the first protection circuit, and the first detecting circuit is specifically configured to detect a voltage drop generated by an impedance of the first protection circuit, and according to the first protection circuit Determining, and a voltage drop generated by an impedance of the first protection circuit, determining a charging current or a discharging current of the charging and discharging circuit;

The second detecting circuit is connected to both ends of the protection circuit, and the second detecting circuit is specifically configured to detect a voltage drop generated by the impedance of the protection circuit, and according to the impedance of the protection circuit, and the protection The voltage drop generated by the impedance of the circuit determines the charging current or discharge current of the charge and discharge circuit.
A battery protection panel according to claim 4, wherein

The first detecting circuit is connected to both ends of the protection circuit, and the first detecting circuit is specifically configured to detect a voltage drop generated by an impedance of the protection circuit, and according to the impedance of the protection circuit, and the protection a voltage drop generated by an impedance of the circuit to determine a charging current or a discharging current of the charging and discharging circuit;

The second detecting circuit is connected to both ends of the protection circuit, and the second detecting circuit is specifically configured to detect a voltage drop generated by the impedance of the protection circuit, and according to the impedance of the protection circuit, and the protection The voltage drop generated by the impedance of the circuit determines the charging current or discharge current of the charge and discharge circuit.
A battery protection panel according to claim 4, wherein

The first detecting circuit is connected to both ends of the protection circuit, and the first detecting circuit is specifically configured to detect a voltage drop generated by an impedance of the protection circuit, and according to the impedance of the protection circuit, and the protection a voltage drop generated by an impedance of the circuit to determine a charging current or a discharging current of the charging and discharging circuit;

The second detecting circuit is connected to both ends of the second protection circuit, the second detecting circuit is configured to detect a voltage drop generated by the impedance of the second protection circuit, and according to the impedance of the second protection circuit And a voltage drop generated by the impedance of the second protection circuit to determine a charging current or a discharging current of the charging and discharging circuit.
The battery protection board according to any one of claims 4 to 8, wherein the first detecting circuit is further configured to detect a battery voltage of the mobile terminal; and the second detecting circuit is further configured to detect the The cell voltage of the mobile terminal.
The battery protection panel according to any one of claims 1 to 9, wherein the impedance of the at least part of the circuit comprises an impedance of a copper trace, and the copper trace is a copper sheath that is impedance-designed. line.
The battery protection panel according to any one of claims 1 to 10, wherein the abnormality of the charge and discharge process of the battery comprises at least one of the following: overcharging, overdischarging, and shorting of the battery.
A battery, comprising:

Batteries;

A battery protection panel according to any one of claims 1 to 11, wherein the battery protection panel is connected to the battery cell.
A mobile terminal, comprising:

Charging interface

The battery of claim 12, said battery being coupled to said charging interface.
The mobile terminal of claim 13, 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 14, 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 14, 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 13 to 16, wherein in the fast charging mode, the mobile terminal performs two-way communication with an adapter through the charging interface.