Battery protection circuit and electronic equipment

Abstract

The invention provides a battery protection circuit and electronic equipment. The battery protection circuit comprises an overvoltage and overcurrent protection circuit and a charging protection circuit. The overvoltage and overcurrent protection circuit is electrically connected with a battery to be protected; a pre-charging loop of the overvoltage and overcurrent protection circuit comprises a protection switch assembly. And the charging protection circuit is connected in parallel with the protection switch assembly, the conduction voltage of the charging protection circuit is smaller than that of the protection switch assembly, and the charging protection circuit is used for forming a pre-charging loop in the pre-charging process. According to the embodiment of the invention, the charging protection circuit with lower conduction voltage is adopted to replace a switch assembly, so that the voltage interference quantity superposed on the battery voltage can be reduced, the duration that the battery needs to be charged by small current but actually charged by large current is shortened, the possibility of damaging the battery is reduced, and the service life of the battery is prolonged.

Description

Technical Field

[0001] The present disclosure relates to the technical field of power protection, and particularly to a battery protection circuit and an electronic device. Background Art

[0002] With the increase in the power consumption of electronic devices, the battery charging frequency also increases accordingly. To protect the normal operation of the battery, an overvoltage and overcurrent protection circuit is provided in the electronic device. The overvoltage and overcurrent protection circuit includes an over-discharge protection circuit provided with two switching devices. When the over-discharge protection circuit operates, it controls the battery to only charge and not discharge, and only small current is allowed for charging to prevent side reactions such as lithium plating in the battery.

[0003] Since the over-discharge protection circuit includes two switching devices, the body diodes of the two switching devices, and the conduction voltage of the body diodes is defaulted to the battery voltage. When the battery voltage rises from a lower voltage to a certain voltage value, there is a situation where the sum of the battery voltage and the body diode voltage is equal to the preset over-discharge voltage threshold; at this time, when switching to charging the battery with a large current, the battery voltage is actually still less than the preset over-discharge voltage threshold due to the existence of the body diode voltage. Then, the battery may be damaged during the charging period when the battery voltage truly equals the preset over-discharge voltage threshold, and thus may affect the battery life. Summary of the Invention

[0004] The present disclosure provides a charging device to solve the above technical problems.

[0005] According to a first aspect of the present disclosure, a battery protection circuit is provided, including an overvoltage and overcurrent protection circuit and a charging protection circuit; the overvoltage and overcurrent protection circuit is electrically connected to the battery to be protected; the pre-charge circuit of the overvoltage and overcurrent protection circuit includes a protection switch assembly; the charging protection circuit is connected in parallel with the protection switch assembly and the conduction voltage of the charging protection circuit is less than the conduction voltage of the protection switch assembly, and is used to form a pre-charge circuit during the pre-charge process.

[0006] Optionally, the charging protection circuit includes a buck switch; the conduction voltage of the buck switch is less than the conduction voltage of the protection switch assembly.

[0007] Optionally, the overvoltage and overcurrent protection circuit includes a first DC bus; the protection switch assembly is connected in series to the first DC bus and is used to disconnect the first DC bus when the voltage and / or current is abnormal; the first end of the buck switch is electrically connected to the first end of the protection switch assembly, and the second end of the buck switch is electrically connected to the second end of the protection switch assembly; the control end of the buck switch is used to switch to the conduction state when receiving a first control signal.

[0008] Optionally, the battery protection circuit further includes a fuel gauge; a control pin of the fuel gauge is electrically connected to a control end of the buck switch, and is configured to output a first control signal when a battery voltage of the battery is less than or equal to a preset over-discharge voltage threshold, where the first control signal is used to control the buck switch to conduct.

[0009] Optionally, the battery protection circuit further includes a controller, a control pin of the controller is electrically connected to a control end of the buck switch, and a battery voltage detection pin of the controller is electrically connected to a positive electrode of the battery, and is configured to output a first control signal when the battery voltage of the battery is less than or equal to the preset over-discharge voltage threshold, where the first control signal is used to control the buck switch to switch to a conducting state.

[0010] Optionally, the controller further includes a current detection pin, and the current detection pin is electrically connected to a first end of the protection switch assembly; the controller is configured to output a first control signal when a current value is less than or equal to a preset current threshold.

[0011] Optionally, the controller further includes a device status detection pin, and the device status detection pin is electrically connected to a second end of the protection switch assembly; the controller is configured to output a second control signal when a status of an electronic device is abnormal to cause the protection switch assembly to switch to an off state.

[0012] Optionally, the protection switch assembly includes a first switch and a second switch, a first end of the first switch is electrically connected to a first end of the protection switch assembly, a second end of the first switch is electrically connected to a first end of the second switch, and a second end of the second switch is electrically connected to a second end of the second switch; the controller further includes a switch conduction detection pin, and the switch conduction detection pin is electrically connected to a second end of the first switch;

[0013] The controller is further configured to output a first control signal when detecting that a voltage of the switch conduction detection pin is equal to a conduction voltage of a body diode of the first switch.

[0014] Optionally, the charging protection circuit includes a controller, and the controller includes a battery voltage detection pin, a device status detection pin, and a ground pin; the battery voltage detection pin of the controller is electrically connected to a positive electrode of the battery, the device status detection pin of the controller is electrically connected to a second end of the protection switch assembly, and the ground pin of the controller is grounded;

[0015] The controller is configured to output a first control signal to conduct the device status detection pin and the ground pin when a voltage at the battery voltage detection pin is less than or equal to a preset over-discharge voltage threshold.

[0016] According to a second aspect of the present disclosure, there is provided an electronic device, including a battery and the battery protection circuit; the battery protection circuit is electrically connected to the battery and is configured to disconnect the charge and discharge loop when the battery voltage and / or current is abnormal.

[0017] The technical solutions provided by the embodiments of the present disclosure may include the following beneficial effects:

[0018] The battery protection circuit provided in this embodiment includes an overvoltage and overcurrent protection circuit and a charging protection circuit; the overvoltage and overcurrent protection circuit is electrically connected to the battery to be protected; the pre-charge loop of the overvoltage and overcurrent protection circuit includes a protection switch assembly; the charging protection circuit is connected in parallel with the protection switch assembly and the conduction voltage of the charging protection circuit is less than the conduction voltage of the protection switch assembly, and is configured to form a pre-charge loop during the pre-charge process. In this way, in this embodiment, the charging protection circuit with a lower conduction voltage is used to replace the switch assembly, which can reduce the amount of voltage interference superimposed on the battery voltage, shorten the duration during which the battery is actually charged with a large current instead of a small current as it should be, is beneficial to reducing the possibility of damaging the battery, and thus prolongs the service life of the battery.

[0019] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a circuit schematic diagram of a battery protection circuit according to an embodiment of the present disclosure.

[0021] Figure 2 It is a circuit schematic diagram of another battery protection circuit according to an embodiment of the present disclosure.

[0022] Figure 3 It is a circuit schematic diagram of yet another battery protection circuit according to an embodiment of the present disclosure.

[0023] Figure 4 It is a circuit schematic diagram of yet another battery protection circuit according to an embodiment of the present disclosure.

[0024] Figure 5 It is a circuit schematic diagram of yet another battery protection circuit according to an embodiment of the present disclosure.

[0025] Figure 6 It is a circuit schematic diagram of yet another battery protection circuit according to an embodiment of the present disclosure.

[0026] Figure 7 It is a circuit schematic diagram of yet another battery protection circuit according to an embodiment of the present disclosure.

[0027] Figure 8 It is a block diagram of an electronic device according to an embodiment of the present disclosure.Detailed Implementation Modes

[0028] Here, exemplary embodiments will be described in detail, and examples thereof are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation modes described in the following exemplary embodiments do not represent all implementation modes consistent with the present disclosure. On the contrary, they are merely examples of devices consistent with some aspects of the present disclosure as detailed in the appended claims.

[0029] To solve the above technical problems, embodiments of the present disclosure provide a battery protection circuit and an electronic device. The above electronic device may include, but is not limited to, devices such as smart phones, computers, digital broadcast terminals, tablet devices, smart bracelets, and smart watches equipped with a battery and a battery protection circuit.

[0030] See Figure 1 , a battery protection circuit includes an overvoltage and overcurrent protection circuit, such as Figure 1 the first-stage protection circuit and the second-stage protection circuit shown in

[0031] In one embodiment, assuming that the battery voltage Vcell of the battery cell is less than the preset over-discharge voltage threshold Vuvp of the battery, the control terminals Dout of the first-stage protection circuit and the second-stage protection circuit output control signals, and at this time, the first loop and the second loop are disconnected. At this time, the battery cell can only be charged and cannot be discharged, and the charging of the battery in the over-discharge protection state is called pre-charging.

[0032] See Figure 2, during pre - charging, the pre - charging current first enters the DC bus P1 +, then enters the battery cell, then flows through the precision resistor Rs, then through the body diode D4 of the discharge path of the protection switch Q4, and then through the charging path of the protection switch Q4; then, it flows through the body diode D3 of the discharge path of the protection switch Q3, and then through the charging path of the protection switch Q3, and finally flows out through the DC bus P1-.

[0033] Based on the above pre - charging process, the voltages at both ends of the DC bus P1 + and the DC bus P1 - are:

[0034] Vp1+_p1- = Vcell + Vd4 + Vd3;

[0035] Wherein, Vcell is the battery voltage, Vd4 represents the conduction voltage of the body diode D4, Vd3 represents the conduction voltage of the body diode D3, and the conduction voltage of the diode is an inherent property of the semiconductor.

[0036] Considering that when the electronic device detects the battery voltage, it will use the detected voltage Vp1+_p1- as the true voltage of the battery, resulting in an interference voltage Vd4 + Vd3 between the detected voltage and the true voltage.

[0037] When the electronic device detects that the battery voltage is greater than or equal to the preset over - discharge voltage threshold, it will switch from the pre - charging mode to the large - current charging mode. The true voltage of the battery will increase accordingly. When the true voltage of the battery is greater than or equal to the preset over - discharge voltage threshold, the damage to the battery caused by large - current charging will be reduced; in other words, during the period from when the detected voltage of the battery is equal to the preset over - discharge voltage threshold to when the true voltage of the battery is equal to the preset over - discharge voltage threshold, large - current charging may damage the battery.

[0038] See Figure 3 , a battery protection circuit provided by an embodiment of the present disclosure further includes a charging protection circuit 30. The charging protection circuit 30 is connected in parallel with the protection switch assembly and the conduction voltage of the charging protection circuit is less than the conduction voltage of the protection switch assembly, and is used to replace the protection switch assembly to form a pre - charging circuit during the pre - charging process. In this way, when the charging protection circuit is in the conducting state, it can replace the protection switch assembly, reduce the voltage interference amount superimposed on the battery voltage, reduce the detected voltage at both ends of the first circuit, shorten the duration during which the battery should be charged with a small current but actually is charged with a large current, is beneficial to reducing the possibility of damaging the battery, and thus prolongs the service life of the battery.

[0039] In one embodiment, see Figure 4 , the charging protection circuit 30 includes a buck switch Q5. The conduction voltage of this buck switch is less than the conduction voltage of the protection switch assembly, which is beneficial to reducing the voltage interference amount for detecting the battery voltage. Continue to see Figure 4, the overvoltage and overcurrent protection circuit includes a first DC bus P1-; a protection switch assembly (including a first switch Q4 and a second switch Q3) is connected in series to the first DC bus and is used to disconnect the first DC bus when the voltage and / or current is abnormal; the first end of the buck switch Q5 is electrically connected to the first end of the protection switch assembly (i.e., the first end of the first switch Q4 ( Figure 4 the left end shown)), the second end of the buck switch Q5 is electrically connected to the second end of the protection switch assembly (i.e., the second end of the second switch Q3 ( Figure 4 the right end shown)); the control end ctrl of the buck switch Q5 is used to switch to the conducting state to replace the protection switch assembly when receiving a first control signal.

[0040] In one embodiment, referring to Figure 5 , the battery protection circuit further includes a fuel gauge. The fuel gauge can detect the battery voltage through a resistor R5 and a resistor R6 respectively. The control pin INIT of the fuel gauge is electrically connected to the control end ctrl of the buck switch Q5 and is used to output a first control signal when the battery voltage of the battery is less than or equal to a preset over-discharge voltage threshold, and the first control signal is used to control the buck switch to conduct, forming a pre-charge circuit as shown by the dotted line. Among them, the first control signal refers to the voltage that controls the buck switch to switch to the conducting state. For example, when the buck switch is implemented by an N-type MOS transistor, the first control signal is a high-level signal, which can control the buck switch to switch to the conducting state, and when the second control signal is a low-level signal, it can control the buck switch to switch to the off state. Another example is that when the buck switch is implemented by a P-type MOS transistor, the first control signal is a low-level signal, which can control the buck switch to switch to the conducting state; when the second control signal is a high-level signal, it can control the buck switch to switch to the conducting state. Those skilled in the art can select the corresponding control signal according to the specific scenario, which is not limited herein.

[0041] In one embodiment, referring to Figure 6 , the battery protection circuit further includes a controller (which can also be called a bypass branch chip) 60. The control pin OUT of the controller 60 is electrically connected to the control end ctrl of the buck switch Q5, and the battery voltage detection pin VDD of the controller 60 is electrically connected to the positive electrode of the battery cell, and is used to output a first control signal when the battery voltage of the battery cell is less than or equal to a preset over-discharge voltage threshold. The above first control signal is used to control the buck switch Q5 to switch to the conducting state, forming a pre-charge circuit as shown by the dotted line. In this way, the conduction voltage of the buck switch Q5 is less than the conduction voltage of the protection switch assembly, and the voltage interference amount of the battery voltage can be reduced when replacing the protection switch assembly, which is beneficial to reducing the possibility of damaging the battery, thereby prolonging the service life of the battery.

[0042] In one embodiment, continue to refer to Figure 6, the controller 60 further includes a current detection pin CS, and the current detection pin is electrically connected to the first end of the protection switch assembly; the controller 60 is configured to output a first control signal when the current value is less than or equal to a preset current threshold. It can be understood that the preset current threshold refers to the maximum value of the pre-charge current. In this way, the controller 60 can protect the battery pre-charge and avoid damaging the battery due to excessive current.

[0043] In one embodiment, continue to refer to Figure 6 , the controller 60 further includes a device status detection pin V-, and the device status detection pin is electrically connected to the second end of the protection switch assembly; the controller 60 is configured to output a second control signal when the electronic device status is abnormal to switch the protection switch assembly to the off state, achieving the effect of protecting the battery.

[0044] In one embodiment, continue to refer to Figure 6 , the protection switch assembly includes a first switch Q4 and a second switch Q3. The first end of the first switch Q4 is electrically connected to the first end of the protection switch assembly. The second end of the first switch Q4 is electrically connected to the first end of the second switch Q3. The second end of the second switch Q3 is electrically connected to the second end of the second switch assembly; the controller further includes a switch conduction detection pin Dio, and the switch conduction detection pin Dio is electrically connected to the second end of the first switch Q4; the controller 60 is further configured to output a first control signal when the voltage of the switch conduction detection pin Dio is equal to the conduction voltage of the body diode D4 of the first switch Q4. In this way, when it is detected that the battery is pre-charging, the path where the buck switch is located is switched to replace the path where the first switch Q4 and the second switch Q3 are located, reducing the voltage interference amount of the battery voltage.

[0045] In one embodiment, refer to Figure 7 , the charging protection circuit includes a controller. The controller includes a battery voltage detection pin VDD, a device status detection pin V-, and a ground pin GND; the battery voltage detection pin VDD of the controller is electrically connected to the positive electrode of the battery cell, the device status detection pin V- of the controller is electrically connected to the second end of the protection switch assembly, and the ground pin of the controller is grounded to GND; the controller is configured to output a first control signal to conduct the device status detection pin V- and the ground pin when the voltage at the battery voltage detection pin VDD is less than or equal to a preset over-discharge voltage threshold. In this way, the controller can conduct the device status detection pin V- and the ground pin, thereby forming a pre-charge circuit as shown by the dashed line, achieving the effect of pre-charging the battery.

[0046] Figure 8 is a block diagram of an electronic device shown according to an exemplary embodiment. For example, the electronic device 800 can be a smart phone, a computer, a digital broadcast terminal, a tablet device, a medical device, a fitness device, a personal digital assistant, etc.

[0047] Referring to Figure 8 , the electronic device 800 may include one or more of the following components: a processing component 802, a memory 804, a power supply component 806, a multimedia component 808, an audio component 810, an input / output (I / O) interface 812, a sensor component 814, a communication component 816, and an image acquisition component 818.

[0048] The processing component 802 generally controls the overall operation of the electronic device 800, such as operations associated with display, telephone calls, data communication, camera operations, and recording operations. The processing component 802 may include one or more processors 820 to execute computer programs. In addition, the processing component 802 may include one or more modules to facilitate the interaction between the processing component 802 and other components. For example, the processing component 802 may include a multimedia module to facilitate the interaction between the multimedia component 808 and the processing component 802. In one example, the processor 820 may implement the solution of the above power supply control method.

[0049] The memory 804 is configured to store various types of data to support the operation of the electronic device 800. Examples of such data include computer programs for any application or method operating on the electronic device 800, contact data, phone book data, messages, pictures, videos, etc. The memory 804 may be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, a magnetic disk, or an optical disk.

[0050] The power supply component 806 provides power to various components of the electronic device 800. The power supply component 806 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power for the electronic device 800. The power supply component 806 may include a power chip, and the controller may communicate with the power chip to control the power chip to turn on or off the first switching device, so that the battery supplies power to the main board circuit or does not supply power.

[0051] The multimedia component 808 includes a screen that provides an output interface between the electronic device 800 and a target object.

[0052] In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen can be implemented as a touch screen to receive input information from a target object. The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensors can sense not only the boundaries of touch or swipe actions but also detect the duration and pressure associated with the touch or swipe operations.

[0053] The audio component 810 is configured to output and / or input audio file information. For example, the audio component 810 includes a microphone (MIC) that is configured to receive external audio file information when the electronic device 800 is in an operating mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio file information can be further stored in the memory 804 or transmitted via the communication component 816. In some embodiments, the audio component 810 further includes a speaker for outputting audio file information.

[0054] The I / O interface 812 provides an interface between the processing component 802 and a peripheral interface module, which can be a keyboard, a click wheel, buttons, etc.

[0055] The sensor component 814 includes one or more sensors for providing status assessments of various aspects of the electronic device 800. For example, the sensor component 814 can detect the on / off state of the electronic device 800, the relative positioning of components, such as the display screen and keypad of the electronic device 800. The sensor component 814 can also detect a change in the position of the electronic device 800 or a component, the presence or absence of contact of a target object with the electronic device 800, the orientation or acceleration / deceleration of the electronic device 800, and a change in the temperature of the electronic device 800. In this example, the sensor component 814 can include a magnetic sensor, a gyroscope, and a magnetic field sensor, and can also include an inertial sensor, an image sensor, etc., where the magnetic field sensor includes at least one of the following: a Hall sensor, a thin film magnetoresistive sensor, a magnetic fluid acceleration sensor.

[0056] The communication component 816 is configured to facilitate communication between the electronic device 800 and other devices in a wired or wireless manner. The electronic device 800 can access a communication standard-based wireless network, such as WiFi, 2G, 3G, 4G, 5G, or a combination thereof. In an exemplary embodiment, the communication component 816 receives broadcast information or broadcast-related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 816 further includes a Near Field Communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on Radio Frequency Identification (RFID) technology, Infrared Data Association (IrDA) technology, Ultra Wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.

[0057] In an exemplary embodiment, the electronic device 800 can be implemented by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components.

[0058] In an exemplary embodiment, the embodiments of the present disclosure also provide a non-transitory computer-readable storage medium, which can implement the method as described above when the executable computer program in the storage medium is executed by a processor.

[0059] In an exemplary embodiment, a chip is further provided. The chip includes a processor and an interface for reading a computer program through the interface to implement the method as described above. Wherein, the chip can be a conventional CPU (Central Processing Unit) chip, GPU (Graphics Processing Unit) chip, etc., or an acceleration chip dedicated to artificial intelligence technology, such as an AI (Artificial Intelligence) accelerator, etc.

[0060] Those skilled in the art will readily conceive of other embodiments of the present disclosure after considering the specification and practicing the disclosure herein. The present disclosure is intended to cover any variations, uses, or adaptations that follow the general principles of the present disclosure and include known common knowledge or conventional technical means in the technical field not disclosed in the present disclosure. The specification and embodiments are only regarded as exemplary, and the true scope and spirit of the present disclosure are pointed out by the following claims.

[0061] It should be understood that the present disclosure is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present disclosure is only limited by the appended claims.

Claims

1. A battery protection circuit, characterized in that, It includes an overvoltage and overcurrent protection circuit and a charging protection circuit; the overvoltage and overcurrent protection circuit is electrically connected to the battery to be protected; the pre-charging circuit of the overvoltage and overcurrent protection circuit includes a protection switch assembly; the charging protection circuit is connected in parallel with the protection switch assembly and the conduction voltage of the charging protection circuit is less than the conduction voltage of the protection switch assembly, and is used to form a pre-charging circuit during the pre-charging process.

2. The battery protection circuit according to claim 1, wherein The charging protection circuit includes a buck switch; the conduction voltage of the buck switch is less than the conduction voltage of the protection switch assembly.

3. The battery protection circuit according to claim 2, wherein The overvoltage and overcurrent protection circuit includes a first DC bus; the protection switch assembly is connected in series on the first DC bus and is used to disconnect the first DC bus when the voltage and / or current is abnormal; the first end of the buck switch is electrically connected to the first end of the protection switch assembly, and the second end of the buck switch is electrically connected to the second end of the protection switch assembly; the control end of the buck switch is used to switch to the conduction state when receiving a first control signal.

4. The battery protection circuit according to claim 3, characterized in that, The battery protection circuit further includes a fuel gauge; the control pin of the fuel gauge is electrically connected to the control end of the buck switch and is used to output a first control signal when the battery voltage of the battery is less than or equal to a preset over-discharge voltage threshold, and the first control signal is used to control the buck switch to conduct.

5. The battery protection circuit according to claim 3, characterized in that The battery protection circuit further includes a controller, the control pin of the controller is electrically connected to the control end of the buck switch and the battery voltage detection pin of the controller is electrically connected to the positive electrode of the battery, and is used to output a first control signal when the battery voltage of the battery is less than or equal to a preset over-discharge voltage threshold, and the first control signal is used to control the buck switch to switch to the conduction state.

6. The battery protection circuit according to claim 5, characterized in that The controller further includes a current detection pin, and the current detection pin is electrically connected to the first end of the protection switch assembly; the controller is used to output a first control signal when the current value is less than or equal to a preset current threshold.

7. The battery protection circuit according to claim 5, characterized in that, The controller further includes a device status detection pin, and the device status detection pin is electrically connected to the second end of the protection switch assembly; the controller is used to output a second control signal when the status of the electronic device is abnormal so that the protection switch assembly switches to the off state.

8. The battery protection circuit according to claim 5, characterized in that, The protection switch assembly includes a first switch and a second switch, the first end of the first switch is electrically connected to the first end of the protection switch assembly, the second end of the first switch is electrically connected to the first end of the second switch, and the second end of the second switch is electrically connected to the second end of the second switch; the controller further includes a switch conduction detection pin, and the switch conduction detection pin is electrically connected to the second end of the first switch; The controller is further used to output a first control signal when detecting that the voltage of the switch conduction detection pin is equal to the conduction voltage of the body diode of the first switch.

9. The battery protection circuit according to claim 1, wherein The charging protection circuit includes a controller, and the controller includes a battery voltage detection pin, a device status detection pin, and a ground pin; the battery voltage detection pin of the controller is electrically connected to the positive electrode of the battery, the device status detection pin of the controller is electrically connected to the second end of the protection switch assembly, and the ground pin of the controller is grounded; The controller is configured to output a first control signal to conduct the device status detection pin and the ground pin when the voltage at the battery voltage detection pin is less than or equal to a preset over-discharge voltage threshold.

10. An electronic device, characterized in that, It includes a battery and the battery protection circuit; the battery protection circuit is electrically connected to the battery and is used to disconnect the charge and discharge loop when the battery voltage and / or current is abnormal.

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