Battery protection circuit and electronic equipment

Abstract

The present application provides a battery protection circuit and an electronic device. The battery protection circuit includes a battery connection terminal, at least one connector terminal, a switch control circuit and a power supply circuit. When at least one connector is fastened to at least one connector terminal, at least one connector terminal is electrically connected. The switch control circuit is electrically connected to the battery connection terminal and at least one connector terminal, respectively, and includes a switch tube. The power supply circuit is electrically connected to the battery connection terminal, and the power supply circuit includes a power supply terminal, which is electrically connected to one of the connector terminals. After at least one connector is fastened to at least one connector terminal, the power supply terminal is electrically connected to the control terminal of the switch tube, and the control terminal of the switch tube is controlled by the power supply voltage provided by the power supply terminal to control the on-off between the battery connection terminal and at least one connector terminal. By controlling the on-off of the switch tube to control the on-off between the battery connection terminal and at least one connector terminal, there is no risk at the moment of fastening the connector.

Description

Technical Field

[0001] The present application relates to the field of charging technology, and in particular to a battery protection circuit and electronic equipment. Background Art

[0002] For high-power charging scenarios, many terminal device manufacturers currently use at least one connector solution, using a power source to charge the battery of the terminal device through at least one connector, and the battery can also power external devices through at least one connector. During the assembly process of the terminal device, since the distance between the battery's electrical connection line and the signal line is close, it is easy for the battery's electrical connection line to be connected to the signal line pin, resulting in the battery voltage being connected to the CPU and causing CPU damage. In the current related technology solutions to the above problems, the battery is charged and no related protection circuit is set, and there is a risk at the moment the connector is buckled on the connector end. Utility Model Content

[0003] The present application provides a battery protection circuit and electronic equipment with high safety.

[0004] To achieve the above objectives, the present application provides a battery protection circuit, comprising:

[0005] A battery connection terminal, used for electrically connecting to a battery;

[0006] at least one connector end, for electrically connecting to at least one connector and to a ground end, wherein when the at least one connector is engaged with the at least one connector end, the at least one connector end is electrically connected to each other;

[0007] a switch control circuit, electrically connected to the battery connection terminal and the at least one connector terminal, respectively, and comprising a switch tube; and

[0008] A power supply circuit is electrically connected to the battery connection end and includes a power supply end, wherein the power supply end is electrically connected to one of the connector ends; after the at least one connector is snapped onto the at least one connector end, the power supply end is electrically connected to the control end of the switch tube, and the control end of the switch tube is controlled by the power supply voltage provided by the power supply end to control the on-off between the battery connection end and the at least one connector end.

[0009] Preferably, the battery protection circuit includes a pair of connector ends; the switch tube includes a first switch tube; the power supply circuit includes a step-down circuit, the step-down circuit is electrically connected between the battery connection end and one of the connector ends, and the step-down circuit converts the power supply voltage of the battery into a first conduction voltage; the switch control circuit also includes a voltage divider branch, the voltage divider branch is electrically connected between the battery connection end and the other connector end; after the pair of connectors are buckled onto the pair of connector ends, the control end of the first switch tube is turned on by the first conduction voltage, so that the battery connection end is connected to the pair of connector ends.

[0010] Preferably, the battery protection circuit includes a pair of connector ends; the switch tube includes a first switch tube; the power supply end of the power supply circuit is connected to the ground end, so that one of the connector ends is grounded; the switch control circuit also includes a voltage divider branch, which is electrically connected between the battery connection end and the other connector end; after the pair of connectors are buckled on the pair of connector ends, the control end of the first switch tube is turned on by the ground voltage provided by the ground end, so that the battery connection end is connected to the pair of connector ends.

[0011] Preferably, the voltage dividing branch comprises a first resistor and a second resistor connected in series between the battery connection end and the other connector end, and the control end of the switch tube is electrically connected to a voltage dividing node between the first resistor and the second resistor; wherein the resistance value of the first resistor is greater than the resistance value of the second resistor;

[0012] Preferably, the pair of connector ends includes a first connector end and a second connector end, the power supply end is electrically connected to the first connector end, and the voltage dividing branch is electrically connected between the battery connection end and the second connector end;

[0013] Preferably, the first switch tube includes a P-type MOS tube.

[0014] Preferably, the battery protection circuit includes a pair of connector ends; the switch tube includes a second switch tube; the power supply circuit includes a bootstrap circuit, the bootstrap circuit is electrically connected between the battery connection end and one of the connector ends, and the bootstrap circuit converts the power supply voltage of the battery into a second conduction voltage; the switch control circuit also includes a current limiting branch, the current limiting branch is electrically connected between the control end of the switch tube and the other connector end; after the pair of connectors are buckled onto the pair of connector ends, the control end of the second switch tube is turned on by the second conduction voltage, so that the battery connection end is connected to the pair of connector ends.

[0015] Preferably, the current limiting branch includes a current limiting resistor, which is electrically connected between the control end of the switch tube and the other connector end;

[0016] Preferably, the bootstrap circuit comprises a bootstrap capacitor electrically connected between the battery connection terminal and one of the connector terminals;

[0017] Preferably, the pair of connector ends includes a first connector end and a second connector end, the power supply end is electrically connected to the first connector end, and the current limiting branch is electrically connected between the control end of the switch tube and the second connector end;

[0018] Preferably, the second switch tube comprises an N-type MOS tube.

[0019] Preferably, the battery protection circuit includes a connector end, the connector end includes a first connection end and a second connection end, the power supply end of the power supply circuit is connected to the ground end and the first connection end, the second connection end is electrically connected to the switch control circuit, and the switch tube includes a third switch tube; the switch control circuit also includes a voltage divider branch, the voltage divider branch is electrically connected between the battery connection end and the second connection end; after the one connector is buckled on the one connector end, the first connection end and the second connection end are turned on, so that the control end of the third switch tube is turned on by the ground voltage provided by the ground end, so that the battery connection end is connected to the one connector end; the third switch tube includes a P-type MOS tube.

[0020] Preferably, the battery protection circuit also includes a controller, a detection circuit electrically connected to the controller, and a switching switch electrically connected to the controller, the detection circuit is electrically connected between the battery connection end and the pair of connector ends, the switching switch is electrically connected between the battery connection end and the pair of connector ends, the detection circuit is used to detect the battery power and / or current and / or voltage, and when the controller detects that the battery power and / or current and / or voltage exceeds a corresponding threshold value, the controller controls the switching switch to disconnect, so as to control the battery connection end to be disconnected from the pair of connector ends.

[0021] Preferably, the detection circuit includes a sampling resistor, the sampling resistor is electrically connected between the battery connection end and the pair of connector ends, the sampling resistor is electrically connected to the controller, and the detection circuit detects the battery charge and / or current and / or voltage through the sampling resistor.

[0022] The present application also provides an electronic device, comprising:

[0023] Battery;

[0024] at least one connector;

[0025] In the battery protection circuit provided by any of the above embodiments, the battery connection end of the battery protection circuit is electrically connected to the battery, and the at least one connector end of the battery protection circuit is electrically connected to the at least one connector and to the ground end.

[0026] Preferably, the battery protection circuit includes a pair of connector ends. When the pair of connectors are snapped onto the pair of connector ends, the pair of connector ends are electrically connected to each other, and the battery protection circuit is integrated into a circuit board; the pair of connectors are plugged into the circuit board to snap onto the pair of connector ends of the circuit board synchronously or sequentially.

[0027] The battery protection circuit and electronic device provided by the present application, the battery protection circuit is provided by setting a battery connection terminal, at least one connector terminal, a switch control circuit and a power supply circuit. The battery connection terminal is used to be electrically connected to the battery. The at least one connector terminal is used to be electrically connected to at least one connector and electrically connected to the ground terminal. The switch control circuit is electrically connected to the battery connection terminal and at least one connector terminal respectively, and a switch tube is provided. The power supply circuit is electrically connected to the battery connection terminal, and the power supply terminal is electrically connected to one of the connector terminals by providing a power supply terminal. After at least one connector is buckled on at least one connector terminal, the power supply terminal is electrically connected to the control terminal of the switch tube through at least one connector terminal electrically connected to each other, and the control terminal of the switch tube is controlled by the power supply voltage provided by the power supply terminal, thereby controlling the on-off between the battery connection terminal and at least one connector terminal. In this way, the on-off between the battery connection terminal and at least one connector terminal is controlled by controlling the on-off of the switch tube. At the moment when at least one connector is buckled on at least one connector terminal, even if the battery terminal is charged, if the control switch tube is not turned on, the battery connection terminal and at least one connector terminal are in a disconnected state, there will be no risk. Moreover, on the basis of controlling the on-off of the switch tube to control the on-off between the battery connection end and at least one connector end, there is no need to consider the fastening order of at least one connector on the connector end, which can avoid the risk of live electricity due to incorrect fastening order, and can also avoid the situation in which the battery's electrical connection line is connected to the signal line pin due to the connector being bent during the process of the connector being fastened to the connector end, causing the battery voltage to be connected to the CPU and damaging the CPU, thereby achieving higher safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0029] Figure 1 Shown is a functional block diagram of an embodiment of an electronic device of the present application.

[0030] Figure 2 Shown is a functional block diagram of an embodiment of a battery protection circuit of the present application.

[0031] Figure 3 Shown Figure 2 A circuit diagram of an embodiment of a battery protection circuit is shown.

[0032] Figure 4 Shown Figure 2 A circuit diagram of yet another embodiment of a battery protection circuit is shown.

[0033] Figure 5 Shown Figure 2 A circuit diagram of another embodiment of a battery protection circuit is shown.

[0034] Figure 6 Shown Figure 2 A circuit diagram of another embodiment of a battery protection circuit is shown.

[0035] Description of reference numerals:

[0036] Electronic device 10, battery 1, battery protection circuit 2, a pair of connectors 3, a first connector 31, a second connector 32, a connector 33, a first port 34, a second port 35, a pair of connector ends 4, a first connector end 41, a second connector end 42, an energy port 43, a connection port 44, a connector end 45, a first connection end 46, a second connection end 47, a battery connection end 5, a switch control circuit 6, a switch tube 61, a first switch tube 611, a second switch tube 612, a third switch tube 613, a voltage dividing branch 62, a first resistor 63, a second resistor 64, a source 65, a control end 66, a current limiting branch 67, a current limiting resistor 68, a power supply circuit 7, a power supply end 71, a step-down circuit 72, a bootstrap circuit 73, a controller 8, a detection circuit 81, a switching switch 82, a sampling resistor 83, a voltage dividing node M, and a ground terminal GND. DETAILED DESCRIPTION

[0037] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0038] The terms used in this application are only for the purpose of describing specific embodiments and are not intended to limit this application. Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The words "first", "second" and similar words used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not indicate a quantity limit, but indicate the existence of a pair. "Multiple" or "several" means two or more. Unless otherwise specified, words such as "front", "rear", "lower" and / or "upper" are only for the convenience of explanation and are not limited to one position or one spatial orientation. Words such as "include" or "comprise" mean that the elements or objects appearing in front of "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, and can include electrical connections, whether direct or indirect.

[0039] The terms used in this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The singular forms of "a", "a", "an" and "the" used in this application and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used in this article refers to and includes any or all possible combinations of one or more associated listed items.

[0040] The battery protection circuit provided in the present application includes a battery connection terminal, at least one connector terminal, a switch control circuit and a power supply circuit. The battery connection terminal is used to be electrically connected to the battery. At least one connector terminal is used to be electrically connected to at least one connector and to the ground terminal. When at least one connector is buckled on at least one connector terminal, at least one connector terminal is electrically connected to each other. The switch control circuit is electrically connected to the battery connection terminal and at least one connector terminal, respectively, and includes a switch tube. The power supply circuit is electrically connected to the battery connection terminal, and the power supply circuit includes a power supply terminal, which is electrically connected to one of the connector terminals. After at least one connector is buckled on at least one connector terminal, the power supply terminal is electrically connected to the control terminal of the switch tube, and the control terminal of the switch tube is controlled by the power supply voltage provided by the power supply terminal to control the on-off between the battery connection terminal and at least one connector terminal.

[0041] The battery protection circuit and electronic device provided by the present application, the battery protection circuit is provided by setting a battery connection terminal, at least one connector terminal, a switch control circuit and a power supply circuit. The battery connection terminal is used to be electrically connected to the battery. The at least one connector terminal is used to be electrically connected to at least one connector and electrically connected to the ground terminal. The switch control circuit is electrically connected to the battery connection terminal and at least one connector terminal respectively, and a switch tube is provided. The power supply circuit is electrically connected to the battery connection terminal, and the power supply terminal is electrically connected to one of the connector terminals by providing a power supply terminal. After at least one connector is buckled on at least one connector terminal, the power supply terminal is electrically connected to the control terminal of the switch tube through at least one connector terminal electrically connected to each other, and the control terminal of the switch tube is controlled by the power supply voltage provided by the power supply terminal, thereby controlling the on-off between the battery connection terminal and at least one connector terminal. In this way, the on-off between the battery connection terminal and at least one connector terminal is controlled by controlling the on-off of the switch tube. At the moment when at least one connector is buckled on at least one connector terminal, even if the battery terminal is charged, if the control switch tube is not turned on, the battery connection terminal and at least one connector terminal are in a disconnected state, there will be no risk. Moreover, on the basis of controlling the on-off of the switch tube to control the on-off between the battery connection end and at least one connector end, there is no need to consider the fastening order of at least one connector on the connector end, which can avoid the risk of live electricity due to incorrect fastening order, and can also avoid the situation in which the battery's electrical connection line is connected to the signal line pin due to the connector being bent during the process of the connector being fastened to the connector end, causing the battery voltage to be connected to the CPU and damaging the CPU, thereby achieving higher safety.

[0042] The battery protection circuit and the electronic device of the present application are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features of the following embodiments and implementations can be combined with each other.

[0043] Figure 1 FIG. 1 is a functional block diagram of an embodiment of an electronic device 10 of the present application. Figure 1 As shown, the electronic device 10 includes a battery 1, at least one connector and a battery protection circuit 2. The battery protection circuit 2 includes a battery connection terminal 5 and at least one connector terminal, the battery connection terminal 5 is used to be electrically connected to the battery 1, and the at least one connector terminal is used to be electrically connected to at least one connector, and the at least one connector is detachably fastened to the at least one connector terminal. Figure 1 In the illustrated embodiment, the electronic device 10 includes a pair of connectors 3, the pair of connectors 3 includes a first connector 31 and a second connector 32, and the first connector 31 and the second connector 32 are electrically connected to each other. The battery protection circuit 2 includes a pair of connector terminals 4 and a battery connection terminal 5. The pair of connector terminals 4 are electrically connected to the pair of connectors 3 respectively. The pair of connectors 3 are detachably buckled to the pair of connector terminals 4. Figure 1In the illustrated embodiment, the electronic device 10 includes two connectors, and the battery protection circuit 2 includes two connector ends. In other optional embodiments, the number of connectors in the electronic device 10 may be one or more; the number of connector ends in the battery protection circuit 2 is set corresponding to the number of connectors in the electronic device 10. This application does not limit this.

[0044] Figure 1 As shown in the figure, a pair of connectors 3 and a pair of connector ends 4 are connected by solid lines, indicating that at this time, the pair of connectors 3 are buckled with the pair of connector ends 4. If the pair of connectors 3 are not buckled with the pair of connector ends 4, they can be connected by dotted lines. In this embodiment, when the pair of connectors 3 are buckled with the pair of connector ends 4, the pair of connector ends 4 are electrically connected to each other. Since the first connector 31 and the second connector 32 are electrically connected to each other, when the pair of connectors 3 are buckled with the pair of connector ends 4, the pair of connector ends 4 are electrically connected to each other, which means that when the pair of connectors 3 are buckled with the pair of connector ends 4, the pair of connector ends 4 are at the same potential. A pair of connectors 3 are electrically connected to the battery protection circuit 2 through a pair of connector ends 4 of the battery protection circuit 2, and the battery 1 is connected to the battery protection circuit 2 through the battery connection end 5 of the battery protection circuit 2. The battery protection circuit 2 is electrically connected between the battery 1 and the pair of connectors 3, which can play a protective role and improve safety.

[0045] Figure 1 The electronic devices shown include but are not limited to portable terminal devices such as mobile phones, tablets, and smart wearables. The terminal devices also include a charge pump, a charging interface, and a power management chip that are electrically connected to a pair of connectors 3. After the battery 1 is connected to the pair of connectors 3, when the terminal device uses electricity, the battery 1 supplies power to the charge pump through the pair of connectors 3, and the charge pump can supply power to the power management chip. When charging the battery 1 in the terminal device, the external power supply charges the charge pump through the charging interface, and then the charge pump charges the battery 1 through the pair of connectors 3. A battery protection circuit 2 is set between the battery 1 and the pair of connector ends 4, so that there is no risk when the pair of connectors 3 are fastened to the pair of connector ends 4, thereby improving safety.

[0046] It is understandable that when the number of connectors in the terminal device is one, after the battery 1 is connected to a connector, when the terminal device is powered, the battery 1 supplies power to the charge pump through a connector, and the charge pump can supply power to the power management chip. When charging the battery 1 in the terminal device, the external power supply charges the charge pump through the charging interface, and then the charge pump charges the battery 1 through a connector. When the number of connectors in the terminal device is multiple, after the battery 1 is connected to multiple connectors, when the terminal device is powered, the battery 1 supplies power to the charge pump through multiple connectors, and the charge pump can supply power to the power management chip. When charging the battery 1 in the terminal device, the external power supply charges the charge pump through the charging interface, and then the charge pump charges the battery 1 through multiple connectors. A battery protection circuit 2 is set between the battery 1 and the connector end, so that there is no risk at the moment when the connector is buckled at the connector end, thereby improving safety.

[0047] In some embodiments, the battery protection circuit 2 includes a pair of connector ends 4. When a pair of connectors 3 are snapped onto the pair of connector ends 4, the pair of connector ends 4 are electrically connected to each other, and the battery protection circuit 2 is integrated into the circuit board; a pair of connectors 3 are plugged into the circuit board to snap onto the pair of connector ends 4 of the circuit board synchronously or sequentially.

[0048] The battery protection circuit 2 is integrated into the circuit board. The integration is high and it is convenient for a pair of connectors 3 to be buckled into a pair of connector ends 4. When a pair of connectors 3 are buckled into the circuit board integrated with the battery protection circuit 2, the pair of connectors 3 are electrically connected to the pair of connector ends 4 of the battery protection circuit 2, and the battery 1 is connected to the battery connection end 5 of the battery protection circuit 2. Such a configuration facilitates the connection between the pair of connectors 3 and the battery protection circuit 2, and also facilitates the connection between the battery 1 and the battery protection circuit 2, and facilitates plugging. In this embodiment, by arranging the battery protection circuit 2 between the battery 1 and the pair of connector ends 4, a protective effect is played, and the buckling order of the pair of connectors 3 does not need to be considered. A pair of connectors 3 are plugged into the circuit board and buckled into a pair of connector ends 4 of the circuit board synchronously or sequentially. For example, the first connector 31 and the second connector 32 can be plugged into the connector end synchronously, or the first connector 31 and the second connector 32 can be plugged into the pair of connector ends 4 in sequence. In this regard, it is highly safe and flexible to plug in.

[0049] Figure 2 FIG. 2 is a schematic diagram of a battery protection circuit 2 according to an embodiment of the present invention. Figure 1 and Figure 2As shown, the battery protection circuit 2 also includes a switch control circuit 6 and a power supply circuit 7. The switch control circuit 6 is electrically connected to the battery connection terminal 5 and at least one connector terminal, respectively, and the switch control circuit 6 includes a switch tube 61. The power supply circuit 7 is electrically connected to the battery connection terminal 5, and includes a power supply terminal 71, and the power supply terminal 71 is electrically connected to one of the connector terminals; after at least one connector is buckled with at least one connector terminal, the power supply terminal 71 is electrically connected to the control terminal 66 of the switch tube 61, and the control terminal 66 of the switch tube 61 is controlled by the power supply voltage provided by the power supply terminal 71 to control the on-off between the battery connection terminal 5 and at least one connector terminal.

[0050] exist Figure 1 and Figure 2 In the illustrated embodiment, the battery protection circuit 2 includes a pair of connector ends 4, the pair of connector ends 4 includes a first connector end 41 and a second connector end 42, and the pair of connector ends 4 are used to be electrically connected to a pair of connectors 3 and electrically connected to the ground terminal GND. The first connector 31 is plugged into the first connector end 41, and the second connector 32 is plugged into the second connector end 42. When the pair of connectors 3 are buckled into the pair of connector ends 4, the pair of connector ends 4 are electrically connected to each other. When the first connector 31 is plugged into the first connector end 41, and the second connector 32 is plugged into the second connector end 42, the first connector end 41 and the second connector end 42 are electrically connected to each other, and at this time, the first connector end 41 and the second connector end 42 are at the same potential. The switch control circuit 6 is electrically connected to the battery connection end 5 and the pair of connector ends 4, respectively. The switch control circuit 6 includes a switch tube 61. The switch tube 61 of the switch control circuit 6 is electrically connected to the battery connection end 5 and the pair of connector ends 4, respectively, and is used to control the on-off between the battery connection end 5 and the pair of connector ends 4. The power supply circuit 7 is electrically connected to the battery connection terminal 5, and the power supply circuit 7 includes a power supply terminal 71, and the power supply terminal 71 is electrically connected to one of the connector terminals. The battery 1 is electrically connected to the battery protection circuit 2 through the battery connection terminal 5, and the power supply circuit 7 is electrically connected to the battery 1 through the battery connection terminal 5, and is used to convert the voltage of the battery 1 into a power supply voltage to be output through the power supply terminal 71. In this embodiment, the power supply terminal 71 is electrically connected to the first connector terminal 41. In other embodiments, the power supply terminal 71 can also be electrically connected to the second connector terminal 42.

[0051] After a pair of connectors 3 are buckled on a pair of connector terminals 4, it indicates that the pair of connector terminals 4 are electrically connected to each other. At this time, the battery 1 is electrically connected to the switch tube 61 through the battery connection terminal 5, the power supply circuit 7, and the pair of connector terminals 4 in sequence. Specifically, the power supply terminal 71 of the power supply circuit 7 is electrically connected to the control terminal 66 of the switch tube 61. The control terminal 66 of the switch tube 61 is controlled by the power supply voltage provided by the power supply terminal 71 to control the connection and disconnection between the battery connection terminal 5 and the pair of connector terminals 4. When a pair of connectors 3 are buckled on a pair of connector terminals 4, in order to avoid risks, it is not necessary to connect the battery connection terminal 5 with the pair of connector terminals 4. At this time, the power supply voltage provided by the power supply circuit 7 through the power supply terminal 71 is not enough to turn on the switch tube 61, that is, the switch tube 61 is in the cut-off state. At this time, it can be ensured that there will be no risks at the moment when the pair of connectors 3 are buckled on the pair of connector terminals 4. If power supply or charging is required after a pair of connectors 3 are buckled into a pair of connector ends 4, the power supply voltage provided by the power supply circuit 7 through the power supply end 71 is sufficient to turn on the switch tube 61, that is, the switch tube 61 is in the on state, so that the external power supply can charge the battery 1 through the pair of connectors 3 through the battery protection circuit 2, and can also ensure that the battery 1 is powered by external equipment.

[0052] exist Figure 1 and Figure 2 In the illustrated embodiment, the battery protection circuit 2 includes two connector ends, and the number of connectors included in the electronic device 10 is two. In other optional embodiments, the number of connectors in the electronic device 10 may be one or more; the number of connector ends in the battery protection circuit 2 is set corresponding to the number of connectors in the electronic device 10. This application does not limit this.

[0053] The battery protection circuit 2 and the electronic device 10 provided in the present application, the battery protection circuit 2 is provided with a battery connection terminal 5, at least one connector terminal, a switch control circuit 6 and a power supply circuit 7. The battery connection terminal 5 is used to be electrically connected to the battery 1. The at least one connector terminal is used to be electrically connected to at least one connector and to the ground terminal GND. The switch control circuit 6 is electrically connected to the battery connection terminal 5 and at least one connector terminal respectively, and a switch tube 61 is provided. The power supply circuit 7 is electrically connected to the battery connection terminal 5, and the power supply terminal 71 is electrically connected to one of the connector terminals by providing a power supply terminal 71. After at least one connector is buckled on at least one connector terminal, the power supply terminal 71 is electrically connected to the control terminal 66 of the switch tube 61 through at least one connector terminal electrically connected to each other, and the control terminal 66 of the switch tube 61 is controlled by the power supply voltage provided by the power supply terminal 71, thereby controlling the on-off between the battery connection terminal 5 and at least one connector terminal. In this configuration, the on-off control of the battery connection terminal 5 and at least one connector terminal is performed by controlling the on-off control of the switch tube 61. At the moment when at least one connector is fastened to at least one connector terminal, even if the battery connection terminal 5 is charged, if the control switch tube 61 is not turned on, the battery connection terminal 5 and at least one connector terminal are in a disconnected state, and there is no risk. Moreover, on the basis of controlling the on-off control of the battery connection terminal 5 and at least one connector terminal by controlling the on-off control of the switch tube 61, it is not necessary to consider the fastening sequence of at least one connector fastened to at least one connector terminal, which can avoid the risk of charging due to incorrect fastening sequence, and can also avoid the situation that the battery voltage is connected to the CPU and damages the CPU due to the connection between the battery connection line and the signal line pin caused by the connector being distorted during the process of the connector being fastened to the connector terminal, and the CPU is damaged, which is safer.

[0054] In this embodiment, when the connector is fastened, the connector ends are not powered, which removes the restrictions on the connector fastening order, reduces the difficulty of production line operation, and improves the production line yield. In addition, because the connector ends are not powered before the connector is fastened, the risk of short circuit during transportation of the battery 1 can be reduced, thereby increasing the safety of transportation of the battery 1.

[0055] Figure 3 Shown Figure 2 A circuit diagram of an embodiment of a battery protection circuit 2 is shown. Figure 3 In the embodiment shown, the battery protection circuit includes a pair of connector terminals 4. The switch tube 61 includes a first switch tube 611. The first switch tube 611 is a low-level conduction switch tube. Figure 3 In the embodiment shown, the first switch tube 611 comprises a P-type MOS tube. The power supply circuit 7 comprises a step-down circuit 72, and the step-down circuit 72 is electrically connected between the battery connection terminal 5 and one of the connector terminals. Figure 3In the embodiment shown, the step-down circuit 72 is electrically connected between the battery connection terminal 5 and the first connector terminal 41. Specifically, the step-down circuit is electrically connected between the battery connection terminal 5 and the connection port 44 of the first connector terminal 41. The step-down circuit 72 converts the power supply voltage of the battery 1 into a first conduction voltage. The switch control circuit 6 also includes a voltage dividing branch 62, which is electrically connected between the battery connection terminal 5 and another connector terminal. Figure 3 In the embodiment shown, the voltage dividing branch 62 is electrically connected between the battery connection terminal 5 and the second connector terminal 42. Specifically, the voltage dividing branch 62 is electrically connected between the battery connection terminal 5 and the connection port 44 of the second connector terminal 42. After the pair of connectors 3 are buckled on the pair of connector terminals 4, the first connector terminal 41 and the second connector terminal 42 are electrically connected to each other, and the power supply terminal 71 of the power supply circuit 7 is electrically connected to the control terminal 66 of the switch tube 61 through the first connector terminal 41. The control terminal 66 of the switch tube 61 is turned on by the first conduction voltage, so that the battery connection terminal 5 is connected to the pair of connector terminals 4.

[0056] In this embodiment, the P-type MOS tube is turned on at a low voltage. When a pair of connectors 3 are buckled with a pair of connector ends 4, to avoid risks, there is no need for the battery connection end 5 to be connected to the pair of connector ends 4. At this time, the power supply voltage provided by the power supply end 71 of the power supply circuit 7 is higher than the turn-on voltage of the P-type MOS tube, and the control end 66 of the P-type MOS tube is controlled to be cut off. At this time, the P-type MOS tube is in a closed state, and it can be ensured that there will be no risks at the moment when the pair of connectors 3 are buckled with the pair of connector ends 4. In this embodiment, after a pair of connectors 3 are buckled with a pair of connector ends 4, the power supply end 71 of the power supply circuit 7 provides a power supply voltage lower than the turn-on voltage of the P-type MOS tube, and the control end 66 of the switch tube 61 is controlled to be turned on, and normal operation can be guaranteed at this time.

[0057] The conduction condition of the P-type MOS tube is that the voltage of the control terminal 66 is less than the voltage of the source 65, and the voltage of the control terminal 66 is not greater than the conduction threshold voltage of the control terminal 66 of the P-type MOS tube. In this embodiment, the voltage dividing branch 62 plays a voltage dividing role. The higher power supply voltage of the battery 1 is converted into a lower first conduction voltage through the step-down circuit 72. The first conduction voltage meets the conduction voltage requirement of the P-type MOS tube, thereby turning on the P-type MOS tube.

[0058] Figure 4 Shown Figure 2 A circuit diagram of another embodiment of the battery protection circuit 2 is shown. Figure 1 to Figure 2 and Figure 4 As shown, Figure 4 The embodiment shown is Figure 3 The embodiment shown is similar, the main difference is that the power supply terminal 71 of the power supply circuit 7 is connected to the ground terminal GND, so that one of the connector terminals is grounded. Figure 4 In the illustrated embodiment, the power supply terminal 71 is electrically connected to the first connector terminal 41. Specifically, the power supply terminal 71 is electrically connected to the connection port 44 of the first connector terminal 41 and is connected to the ground terminal GND. The power supply circuit 7 is a circuit connecting the connection port 44 of the first connector terminal 41 and the ground terminal GND, and the first connector 31 is grounded. After a pair of connectors 3 are buckled on a pair of connector terminals 4, the power supply terminal 71 of the power supply circuit 7 is electrically connected to the control terminal 66 of the switch tube 61, and the control terminal 66 of the switch tube 61 is turned on by the ground voltage provided by the ground terminal GND, so that the battery connection terminal 5 is connected to the pair of connector terminals 4. That is, the battery connection terminal 5 is connected to the two power ports 43 of the pair of connector terminals 4, so that the two power ports 43 of the pair of connector terminals 4 are charged.

[0059] By grounding the connection port 44 of the first connector end 41, the connection terminal voltage of the first connector end 41 is zero. After the pair of connectors 3 are buckled with the pair of connector ends 4, the connection port 44 of the first connector end 41 is connected to the connection port 44 of the second connector end 42, so the connection port 44 of the second connector end 42 is also zero. Because the switch control circuit 6 is electrically connected between the battery connection terminal 5 and the pair of connector ends 4, the voltage of the connection port 44 of the second connector end 42 is also zero, providing a very low voltage reference for the control terminal 66 of the switch tube 61, so that the control terminal 66 voltage of the switch tube 61 can be reduced to less than or equal to the conduction threshold voltage of the switch tube 61. Figure 3 Compared with the embodiment shown, the power supply terminal 71 of the power supply circuit 7 is grounded, and the ground voltage can be provided by using the existing ground terminal GND, without adding other circuits. The implementation is simple, low-cost, and highly safe.

[0060] exist Figure 4In the illustrated embodiment, the voltage-dividing branch 62 includes a first resistor 63 and a second resistor 64 connected in series between the battery connection terminal 5 and another connector terminal, and the control terminal 66 of the switch tube 61 is electrically connected to the voltage-dividing node M of the first resistor 63 and the second resistor 64. That is, the voltage-dividing branch 62 includes a first resistor 63 and a second resistor 64 connected in series between the battery connection terminal 5 and the connection port 44 of the second connector terminal 42. The first resistor 63 and the second resistor 64 play a voltage-dividing role. Among them, the first resistor 63 is close to the battery connection terminal 5, and the second resistor 64 is close to the ground terminal GND. The control terminal 66 of the P-type MOS tube is electrically connected to the voltage-dividing node of the first resistor 63 and the second resistor 64, so that the voltage of the control terminal 66 of the P-type MOS tube is the voltage after the voltage is divided by the first resistor 63 and the second resistor 64, ensuring that the P-type MOS tube is normally turned on. By setting the voltage dividing branch 62, the voltage between the battery connection terminal 5 and the power supply terminal 71 is divided into the voltage across the first resistor 63 and the voltage across the second resistor 64. By adjusting the resistance values ​​of the first resistor 63 and the second resistor 64 in the voltage dividing branch 62 and configuring different resistance values ​​of the first resistor 63 and the second resistor 64, the voltage of the control terminal 66 of the P-type MOS tube can be adjusted so that the voltage of the control terminal 66 of the P-type MOS tube meets the conduction requirement of the P-type MOS tube.

[0061] In this embodiment, the resistance of the first resistor 63 is greater than the resistance of the second resistor 64, so that the voltage across the first resistor 63 is greater than the voltage across the second resistor 64, and the voltage of the second resistor 64 is prevented from flowing back to the battery connection terminal 5 through the first resistor 63, thereby improving safety. In this embodiment, the resistance of the first resistor 63 is much greater than that of the second resistor 64, and is changed according to the electrical requirements of the P-type MOS tube. In this example, the resistance of the first resistor 63 is 100K and the resistance of the second resistor 64 is 10K, but it is not limited thereto.

[0062] Please refer to Figure 5 , Figure 5 Shown Figure 2 A circuit diagram of another embodiment of the battery protection circuit 2 is shown. Figures 1 to 5 As shown, Figure 5 The embodiment shown is Figure 4 The embodiment shown is similar, the main difference is that in Figure 5 In the illustrated embodiment, the battery protection circuit 2 includes a connector end 45 including a first connection end 46 and a second connection end 47 , and the electronic device includes a connector 33 including a first port 34 and a second port 35 .

[0063] The power supply end 71 of the power supply circuit 7 is connected to the ground end GND and to the first connection end 46, and the second connection end 47 is electrically connected to the switch control circuit 6. The switch tube 61 includes a third switch tube 613; the switch control circuit 6 also includes a voltage dividing branch 62, and the voltage dividing branch 62 is electrically connected between the battery connection end 5 and the second connection end 47; after a connector 33 is buckled on a connector end 45, that is, the first port 34 of a connector 33 is electrically connected to the first connection end 46 of a connector end 45, and the second port 35 of a connector 33 is electrically connected to the second connection end 47 of a connector end 45, the first connection end 46 and the second connection end 47 are turned on, so that the control end 66 of the third switch tube 613 is turned on by the ground voltage provided by the ground end GND, so that the battery connection end 5 is connected to a connector end 45. Among them, the third switch tube is a low-level conduction switch tube. Figure 5 In the illustrated embodiment, the third switch tube 613 comprises a P-type MOS tube.

[0064] exist Figure 5 In the illustrated embodiment, a connection state is shown when a connector 33 is engaged with a connector end 45, the first port 34 is connected to the first connection end 46 by a solid line, and the second port 35 is connected to the second connection end 47 by a solid line. When a connector 33 is not engaged with a connector end 45, the first port 34 is connected to the first connection end 46 by a dotted line, and the second port 35 is connected to the second connection end 47 by a dotted line.

[0065] When a connector 33 is buckled with a connector end 45, the first connection end 46 and the second connection end 47 included in the connector end 45 are connected inside the connector 33, and then the control end 66 of the third switch tube 613 is turned on by the ground voltage provided by the ground end GND, so that the battery connection end 5 is connected with the connector end 45. When a connector 33 is not buckled with a connector end 45, the first connection end 46 and the second connection end 47 included in the connector end 45 are not electrically connected. At this time, the third switch tube 613 is in a non-conducting state, and the battery connection end 5 is not connected with the connector end 45, that is, the connector end 45 is not charged, which can avoid the risk of the connector being charged when buckled.

[0066] It can be understood that when there are multiple connectors in the electronic device 10, there are also multiple connector ends in the battery protection circuit 2, and multiple connectors are electrically connected to form a series of connector strings. The connector end also includes a first connection end 46 and a second connection end 47, and the first connection end 46 is used to electrically connect to the connector at the first position, and the second connection end 47 is used to electrically connect to the connector at the last position. When multiple connectors are buckled on multiple connector ends, the first connection end 46 and the second connection end 47 are electrically connected, so that the voltage provided by the power supply end 71 is applied to the control end 66 of the switch tube 61 through the second connection end 47 and the first connection end 46, so that the switch tube 61 is turned on, and then the battery connection end 5 is turned on with multiple connector ends. When the multiple connectors are not engaged with the multiple connector ends, there is no electrical connection between the first connection end 46 and the second connection end 47, and the voltage provided by the power supply end 71 cannot be applied to the control end 66 of the switch tube 61. The switch tube 61 is in a disconnected state, thereby disconnecting the battery connection end 5 from the multiple connector ends, making the multiple connector ends unpowered, thereby avoiding the risk of the connectors being engaged with power.

[0067] Figure 6 Shown Figure 2 A circuit diagram of another embodiment of the battery protection circuit 2 is shown. Figure 1 to Figure 2 and Figure 6 As shown, Figure 6 The embodiment shown is Figure 3 The embodiment shown in FIG. 1 is similar to the embodiment shown in FIG. 1 , and the main difference is that the switch tube 61 includes a second switch tube 612, and the second switch tube 612 is a high-level conduction switch tube. Figure 3 In the embodiment shown, the second switch tube 612 comprises a P-type MOS tube. The power supply circuit 7 comprises a bootstrap circuit 73, and the bootstrap circuit 73 is electrically connected between the battery connection terminal 5 and one of the connector terminals. Figure 6 In the illustrated embodiment, the bootstrap circuit 73 is electrically connected between the battery connection terminal 5 and the connection port 44 of the first connector terminal 41, and the power supply terminal 71 is electrically connected to the connection port 44 of the first connector terminal 41. The bootstrap circuit 73 converts the power supply voltage of the battery 1 into a second conduction voltage. Among them, the bootstrap circuit 73 is a kind of boost circuit, and the bootstrap circuit 73 may include a bootstrap capacitor, and the bootstrap capacitor is electrically connected between the battery connection terminal 5 and the first connector terminal 41. This embodiment does not limit the bootstrap circuit 73. The switch control circuit 6 also includes a current limiting branch 67, and the current limiting branch 67 is electrically connected between the control terminal 66 of the switch tube 61 and another connector terminal. In Figure 4In the embodiment shown, the current limiting branch 67 is electrically connected between the control end 66 of the switch tube 61 and the second connector end. Specifically, the current limiting branch 67 is electrically connected between the control end 66 of the N-type MOS tube and the connection port 44 of the second connector end. After a pair of connectors 3 are buckled on a pair of connector ends 4, the control end 66 of the switch tube 61 is turned on by the second conduction voltage, so that the battery connection end 5 is connected to the pair of connector ends 4. The second conduction voltage is greater than or equal to the conduction voltage of the control end 66 of the N-type MOS tube. In this embodiment, the control end 66 of the N-type MOS tube is turned on at a high level. When a pair of connectors 3 are buckled on a pair of connector ends 4, to avoid risks, it is not necessary to connect the battery connection end 5 with the pair of connector ends 4. At this time, the power supply circuit 7 can provide a power supply voltage lower than the conduction voltage through the power supply end 71 to control the control end 66 of the N-type MOS tube to be cut off. At this time, the N-type MOS tube is in a closed state, and it can be ensured that there will be no risks at the moment when the pair of connectors 3 are buckled on the pair of connector ends 4. After a pair of connectors 3 are buckled with a pair of connector ends 4, the power supply end 71 of the power supply circuit 7 provides a power supply voltage higher than the conduction voltage to control the control end 66 of the N-type MOS tube to be turned on, thereby ensuring normal operation.

[0068] The conduction condition of the N-type MOS tube is that the voltage of the control terminal 66 is greater than the voltage of the source 65, and the voltage of the control terminal 66 is greater than or equal to the conduction voltage of the control terminal 66 of the N-type MOS tube. In this embodiment, the power supply voltage of the battery 1 is boosted and converted into a second conduction voltage through the bootstrap circuit 73, and applied to the connection port 44 of the first connector end 41. After a pair of connectors 3 are buckled on a pair of connector ends 4, the connection ports 44 of the pair of connector ends 4 are electrically connected, which is equivalent to applying the second conduction voltage to the connection port 44 of the second connector end. In this embodiment, the current limiting branch 67 is electrically connected between the control terminal 66 of the N-type MOS tube and the connection port 44 of the second connector end. In this way, the second conduction voltage applied to the connection port 44 of the second connector end 42 is applied to the control terminal 66 of the N-type MOS tube through the current limiting branch 67. The current limiting branch 67 plays a current limiting role and can also play a role in preventing backflow.

[0069] In this embodiment, the source electrode 65 of the N-type MOS tube is connected to the battery connection terminal 5, so the voltage of the source electrode 65 of the N-type MOS tube is equal to the voltage of the battery connection terminal 5, and the control terminal 66 of the N-type MOS tube is the second turn-on voltage of the voltage of the battery connection terminal 5 after passing through the bootstrap circuit 73, so the voltage of the control terminal 66 of the N-type MOS tube is greater than the voltage of the source electrode 65 of the N-type MOS tube, and the bootstrap circuit 73 can raise the voltage of the control terminal 66 of the N-type MOS tube to a level greater than or equal to the turn-on threshold voltage of the control terminal 66 of the N-type MOS tube, so that the N-type MOS tube is turned on.

[0070] exist Figure 6In the illustrated embodiment, the current limiting branch 67 includes a current limiting resistor 68, which is electrically connected between the control terminal 66 of the switch tube 61 and another connector terminal. That is, the current limiting resistor 68 is electrically connected between the control terminal 66 of the N-type MOS tube and the connection port 44 of the second connector terminal. The current limiting resistor 68 is used to reduce the current of the current limiting branch 67 to prevent the current flowing through the N-type MOS tube from being too large and damaging the N-type MOS tube.

[0071] Look back Figure 3 In the illustrated embodiment, the battery protection circuit 2 further includes a controller 8, a detection circuit 81 electrically connected to the controller 8, and a switching switch 82 electrically connected to the controller 8. The detection circuit 81 is electrically connected between the battery connection terminal 5 and a pair of connector terminals 4. Specifically, the detection circuit 81 is electrically connected between the battery connection terminal 5 and the power port 43 of the pair of connector terminals 4. The detection circuit 81 includes a sampling resistor 83, and the sampling resistor 83 is electrically connected between the battery connection terminal 5 and the pair of connector terminals 4. The sampling resistor 83 is electrically connected to the controller 8, and the detection circuit 81 detects the power and / or current and / or voltage of the battery 1 through the sampling resistor 83. The switching switch 82 is electrically connected between the battery connection terminal 5 and the pair of connector terminals 4. When the controller 8 detects that the power and / or current and / or voltage of the battery 1 exceeds the corresponding threshold, the switching switch 82 is controlled to be disconnected to control the battery connection terminal 5 to be disconnected from the pair of connector terminals 4. By setting the detection circuit 81, the power and / or current and / or voltage of the battery 1 can be detected in real time, so as to understand the working parameters and performance of the battery 1. Furthermore, by providing a switching switch 82, when at least one of over-power, over-current or over-voltage occurs, the battery connection terminal 5 and the pair of connector terminals 4 are disconnected in time, thereby improving safety.

[0072] exist Figure 3 In the embodiment shown, the switching switch 82 includes two pairs of switch components, one pair of switch components is arranged between the first connector end 41 and the battery connection end 5, and the other pair of switch components is arranged between the second connector end 42 and the battery connection end 5. The control ends 66 of the two pairs of switch components are electrically connected to the controller 8. The controller controls the on and off of the two pairs of switch components by controlling the control ends 66 of the two pairs of switch components. The switching switch can also adopt other circuit structures to achieve the purpose of connecting and disconnecting the first connector end 41 and the battery connection end 5, and connecting and disconnecting the second connector end 42 and the battery connection end 5, which is not limited by comparison in this application. By providing a controller 8, a detection circuit 81 electrically connected to the controller 8, and a switching switch 82 electrically connected to the controller 8, it is convenient to detect the voltage, current or power information of the battery 1, grasp the charging or discharging status of the battery 1, and when the charging or discharging is abnormal, the controller 8 controls the switching switch 82 to be disconnected, thereby improving the charging and discharging safety of the battery 1.

[0073] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the application disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0074] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A battery protection circuit, characterized in that: include: A battery connection terminal, used for electrically connecting to a battery; at least one connector end, for electrically connecting to at least one connector and to a ground end, wherein when the at least one connector is engaged with the at least one connector end, the at least one connector end is electrically connected to each other; a switch control circuit, electrically connected to the battery connection terminal and the at least one connector terminal, respectively, and comprising a switch tube; and A power supply circuit is electrically connected to the battery connection end and includes a power supply end, wherein the power supply end is electrically connected to one of the connector ends; after the at least one connector is snapped onto the at least one connector end, the power supply end is electrically connected to the control end of the switch tube, and the control end of the switch tube is controlled by the power supply voltage provided by the power supply end to control the on-off between the battery connection end and the at least one connector end.

2. The battery protection circuit according to claim 1, characterized in that: The battery protection circuit includes a pair of connector ends; the switch tube includes a first switch tube; the power supply circuit includes a step-down circuit, which is electrically connected between the battery connection end and one of the connector ends, and the step-down circuit converts the power supply voltage of the battery into a first conduction voltage; the switch control circuit also includes a voltage divider branch, which is electrically connected between the battery connection end and the other connector end; after the pair of connectors are buckled on the pair of connector ends, the control end of the first switch tube is turned on by the first conduction voltage, so that the battery connection end is connected to the pair of connector ends.

3. The battery protection circuit according to claim 1, characterized in that: The battery protection circuit includes a pair of connector ends; the switch tube includes a first switch tube; the power supply end of the power supply circuit is connected to the ground end, so that one of the connector ends is grounded; the switch control circuit also includes a voltage divider branch, which is electrically connected between the battery connection end and the other connector end; after the pair of connectors are buckled on the pair of connector ends, the control end of the first switch tube is turned on by the ground voltage provided by the ground end, so that the battery connection end is connected to the pair of connector ends.

4. The battery protection circuit according to claim 2 or 3, characterized in that: The voltage dividing branch includes a first resistor and a second resistor connected in series between the battery connection end and the other connector end, and the control end of the switch tube is electrically connected to the voltage dividing node of the first resistor and the second resistor; wherein the resistance value of the first resistor is greater than the resistance value of the second resistor; and / or The pair of connector ends includes a first connector end and a second connector end, the power supply end is electrically connected to the first connector end, and the voltage dividing branch is electrically connected between the battery connection end and the second connector end; and / or The first switch tube comprises a P-type MOS tube.

5. The battery protection circuit according to claim 1, characterized in that: The battery protection circuit includes a pair of connector ends; the switch tube includes a second switch tube; the power supply circuit includes a bootstrap circuit, which is electrically connected between the battery connection end and one of the connector ends, and the bootstrap circuit converts the power supply voltage of the battery into a second conduction voltage; the switch control circuit also includes a current limiting branch, which is electrically connected between the control end of the switch tube and the other connector end; after the pair of connectors are buckled on the pair of connector ends, the control end of the second switch tube is turned on by the second conduction voltage, so that the battery connection end is connected to the pair of connector ends.

6. The battery protection circuit according to claim 5, characterized in that: The current limiting branch includes a current limiting resistor, which is electrically connected between the control end of the switch tube and the other connector end; and / or The bootstrap circuit comprises a bootstrap capacitor electrically connected between the battery connection terminal and one of the connector terminals; and / or The pair of connector ends includes a first connector end and a second connector end, the power supply end is electrically connected to the first connector end, and the current limiting branch is electrically connected between the control end of the switch tube and the second connector end; and / or The second switch tube includes an N-type MOS tube.

7. The battery protection circuit according to claim 1, characterized in that: The battery protection circuit includes a connector end, the connector end includes a first connection end and a second connection end, the power supply end of the power supply circuit is connected to the ground end and the first connection end, the second connection end is electrically connected to the switch control circuit, and the switch tube includes a third switch tube; the switch control circuit also includes a voltage divider branch, the voltage divider branch is electrically connected between the battery connection end and the second connection end; after the connector is buckled on the connector end, the first connection end and the second connection end are turned on, so that the control end of the third switch tube is turned on by the ground voltage provided by the ground end, so that the battery connection end is connected to the connector end; the third switch tube includes a P-type MOS tube.

8. The battery protection circuit according to claim 2, characterized in that: The battery protection circuit also includes a controller, a detection circuit electrically connected to the controller, and a switching switch electrically connected to the controller, the detection circuit is electrically connected between the battery connection end and the pair of connector ends, the switching switch is electrically connected between the battery connection end and the pair of connector ends, the detection circuit is used to detect the battery power and / or current and / or voltage, and when the controller detects that the battery power and / or current and / or voltage exceeds the corresponding threshold value, the controller controls the switching switch to disconnect, so as to control the battery connection end to be disconnected from the pair of connector ends.

9. The battery protection circuit according to claim 8, characterized in that: The detection circuit includes a sampling resistor, the sampling resistor is electrically connected between the battery connection end and the pair of connector ends, the sampling resistor is electrically connected to the controller, and the detection circuit detects the battery power and / or current and / or voltage through the sampling resistor.

10. An electronic device, characterized in that: include: Battery; at least one connector; and The battery protection circuit according to any one of claims 1 to 8, wherein the battery connection terminal of the battery protection circuit is electrically connected to the battery, and the at least one connector terminal of the battery protection circuit is electrically connected to the at least one connector and to a ground terminal.

11. The electronic device according to claim 10, characterized in that: The battery protection circuit includes a pair of connector ends. When the pair of connectors are buckled on the pair of connector ends, the pair of connector ends are electrically connected to each other, and the battery protection circuit is integrated on a circuit board. The pair of connectors are plugged into the circuit board to be buckled on the pair of connector ends of the circuit board synchronously or sequentially.

Images