A battery displacement automatic power-off circuit and a battery assembly

Abstract

The application provides a battery displacement automatic power-off circuit and a battery assembly. The battery displacement automatic power-off circuit senses the installation state of the battery assembly through detection switches of different positions of a position detection module. A logic control module and a loop switch module quickly make decisions and timely turn on and off the power supply loop, effectively preventing the risks of poor contact, spark and short circuit caused by loose battery. An optional battery protection module further provides overcharge, overdischarge and overcurrent electrical abnormality protection, and jointly builds a double protection system from physical installation safety to electrical use safety, significantly improving the safety and reliability of various portable electronic devices and electric tools and other products. The overall circuit structure is simple, easy to integrate, and has significant cost advantages.

Description

Technical Field

[0001] This utility model relates to the field of electronic circuit technology, specifically to an automatic power-off circuit for battery displacement and a battery assembly. Background Technology

[0002] Currently, batteries are widely used as a power source for various portable electronic and communication devices. In practical applications, deficiencies in initial structural design, manufacturing and assembly processes, or user environments can easily lead to unstable battery operation within the device.

[0003] For devices with built-in batteries, if the battery is not securely fixed within the cavity, it may shift and make abnormal contact and compression with the internal casing structure. Under prolonged use, this continuous mechanical stress may puncture the battery separator, leading to serious safety accidents such as internal short circuits, overheating, or even fire.

[0004] For removable external batteries, charging and discharging are typically accomplished by connecting the device's flexible metal contacts to exposed contacts on the battery surface. This point-contact connection method has a limited contact area. When the device is charging and discharging with high current, if the battery becomes loose inside the compartment, poor contact between the contacts and the battery may cause electrical sparks or instantaneous high temperatures. Over time, this can create safety hazards and affect the reliability and safety of the device. Utility Model Content

[0005] This utility model provides an automatic power-off circuit and battery assembly for battery displacement, which can solve the technical problems of safety hazards such as abnormal contact and friction sparks caused by battery displacement in the equipment, as well as the lack of an effective and fast displacement power-off protection mechanism in the prior art.

[0006] In a first aspect, embodiments of this application provide an automatic power-off circuit for battery displacement, integrated into a battery assembly, wherein the battery assembly is installed in an electronic device and supplies power to the electronic device through a positive output terminal and a negative output terminal; the circuit includes:

[0007] The position detection module includes at least two detection switches located at different positions of the battery assembly, which are used to collaboratively detect the installation status of the battery assembly within the device.

[0008] The logic control module has a first input terminal connected to both the positive terminal and the positive output terminal of the battery assembly, and a second input terminal connected to the output terminal of the position detection module, for outputting control signals according to the closed state of the detection switch;

[0009] A circuit switch module is connected in series in the power supply circuit of the battery assembly, and its control terminal is connected to the output terminal of the logic control module. It is used to turn on or off the power supply circuit of the battery according to the control signal.

[0010] Specifically, when all the detection switches are closed simultaneously, the logic control module outputs a first signal to turn on the loop switch module and establish a battery power supply circuit; when any of the detection switches is open, the logic control module outputs a second signal to turn off the loop switch module and cut off the battery power supply circuit.

[0011] In some embodiments, the detection switch is a mechanical switch, a micro switch, or a resilient metal contact.

[0012] In some embodiments, the position detection module includes a first current-limiting resistor R1, a first detection switch K1, and a second detection switch K2;

[0013] The first end of the first current-limiting resistor R1 is connected to the input end of the position detection module; the first end of the first detection switch K1 is connected to the second end of the first current-limiting resistor R1; the first end of the second detection switch K2 is connected to the second end of the first detection switch K1, and the second end of the second detection switch K2 is connected to the output end of the position detection module.

[0014] In some embodiments, the logic control module includes a pull-up resistor R2, a second current-limiting resistor R3, and a first switching transistor Q1;

[0015] The first end of the pull-up resistor R2 is connected to the first input terminal of the logic control module, and the second end of the pull-up resistor R2 is connected to the second input terminal of the logic control module; the first end of the second current-limiting resistor R3 is connected to the first end of the pull-up resistor R2; the control terminal of the first switch Q1 is connected to the second end of the pull-up resistor R2, the first end of the first switch Q1 is connected to the second end of the second current-limiting resistor R3, and the second end of the first switch Q1 is connected to the output terminal of the logic control module.

[0016] In some embodiments, the loop switch module includes a second switch Q2;

[0017] The control terminal of the second switch Q2 is connected to the control terminal of the circuit switch module, the first terminal of the second switch Q2 is connected to the negative terminal of the battery assembly, and the second terminal of the second switch Q2 is connected to the negative output terminal.

[0018] In some embodiments, the automatic power-off circuit for battery displacement further includes a battery protection module connected in the power supply circuit of the battery assembly, which monitors the charging and discharging current during the charging and discharging process of the battery assembly, and disconnects the power supply circuit of the battery assembly when the charging and discharging current exceeds a threshold.

[0019] In some embodiments, the battery protection module includes a battery protection chip U1, a fourth resistor R4, a fifth resistor R5, and a third switch Q3;

[0020] The power supply terminal of the battery protection chip U1 is connected to the positive terminal of the battery assembly; the first terminal of the fourth resistor R4 is connected to the discharge control terminal of the battery protection chip U1; the first terminal of the fifth resistor R5 is connected to the charging control terminal of the battery protection chip U1; the third switch Q3 is a pair of dual N-MOS transistors integrated together, the first control terminal of the third switch Q3 is connected to the second terminal of the fourth resistor R4, the second control terminal of the third switch Q3 is connected to the second terminal of the fifth resistor R5, the first terminal of the third switch Q3 is connected to the negative terminal of the battery assembly, and the second terminal of the third switch Q3 is connected to the input terminal of the loop switch module.

[0021] In some embodiments, the battery protection module further includes a first capacitor C1, a sixth resistor R6, a second capacitor C2, and a third capacitor C3;

[0022] The first terminal of the first capacitor C1 is connected to the power supply terminal of the battery protection chip U1, and the second terminal of the first capacitor C1 is connected to the ground terminal of the battery protection chip U1; the first terminal of the sixth resistor R6 is connected to the voltage monitoring terminal of the battery protection chip U1, and the second terminal of the sixth resistor R6 is connected to the second terminal of the third switch Q3; the second capacitor C2 and the third capacitor C3 are connected in series, the first terminal of the second capacitor C2 is connected to the first terminal of the third switch Q3, and the second terminal of the third capacitor C3 is connected to the second terminal of the third switch Q3.

[0023] In some embodiments, the battery displacement automatic power-off circuit further includes a Zener diode T1, the first end of which is connected to the positive output terminal, and the second end of which is grounded.

[0024] Secondly, embodiments of this application provide a battery assembly, including a battery cell and an automatic power-off circuit for battery displacement as described in any embodiment of the first aspect.

[0025] The battery displacement automatic power-off circuit and battery assembly including the circuit provided in this application embodiment sense the installation status of the battery assembly through detection switches at different positions of the position detection module. The logic control module and the circuit switch module make quick decisions to promptly switch the power supply circuit on and off, effectively eliminating the risks of poor contact, sparks and short circuits caused by loose batteries. Its optional battery protection module further provides electrical abnormality protection such as overcharge, over-discharge and overcurrent, together constructing a dual protection system from physical installation safety to electrical use safety, significantly improving the safety and reliability of various portable electronic devices and power tools. Moreover, the overall circuit structure is simple, easy to integrate, and has significant cost advantages. Attached Figure Description

[0026] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0027] Figure 1 This is a schematic diagram of the structure of a battery assembly provided in one embodiment of this application.

[0028] Figure 2 This is a schematic diagram of the automatic power-off circuit for battery displacement provided in one embodiment of this application.

[0029] Figure 3 This is a schematic diagram of the automatic power-off circuit for battery displacement provided in another embodiment of this application.

[0030] Figure 4 This is a circuit diagram of an automatic power-off circuit for battery displacement provided in one embodiment of this application.

[0031] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Similar elements in different embodiments are referred to by related similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0033] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. At the same time, the steps or actions in the method description can be rearranged or adjusted in a manner obvious to those skilled in the art. Therefore, the various orders in the specification and drawings are only for the clear description of a particular embodiment and do not imply a necessary order, unless otherwise stated that a particular order must be followed.

[0034] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class, without limiting the number of objects; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship. Unless otherwise specified, the terms "connection" and "linkage" used in this application include both direct and indirect connections (linkages).

[0035] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0036] Figure 1 This is a schematic diagram of the structure of a battery assembly provided in one embodiment of this application. Figure 1 As shown, the battery assembly provided in this embodiment integrates a battery cell 10 and a battery displacement automatic power-off circuit 20 with intelligent protection features.

[0037] As the energy core of electronic devices, battery modules are precisely and securely installed in their corresponding battery compartments within the devices. Each battery module has dedicated positive and negative output terminals, which act as "bridges" for power transmission, tightly connecting to the corresponding power interfaces inside the electronic device to establish a complete power supply loop. Once the battery module is installed and the electronic device is powered on, the stored electrical energy flows out systematically through the positive output terminal, passing through the device's complex internal circuitry to provide a stable operating current to various functional modules and components. The negative output terminal, on the other hand, forms a complete current loop, ensuring a continuous and smooth power supply, thereby guaranteeing the normal operation of all functions of the electronic device. Battery modules are not only widely used in portable electronic devices such as mobile phones, tablets, walkie-talkies, and smartwatches, but also in devices with higher requirements for battery installation stability and safety, such as power tools, drones, portable medical devices, and outdoor emergency power supplies.

[0038] In this embodiment, the battery cell 10 is the core energy storage unit of the entire battery assembly, typically a rechargeable lithium-ion or lithium polymer cell. It is responsible for storing chemical energy and converting it into electrical energy. Its positive terminal is electrically connected to the positive output terminal of the battery assembly, while its negative terminal is connected to the battery displacement automatic power-off circuit 20. It not only serves as the power source for the electronic equipment but also provides all the power support for the subsequent displacement detection, logic control, and load devices of the battery displacement automatic power-off circuit 20.

[0039] The automatic power-off circuit 20 for battery displacement has a built-in intelligent detection and power-off mechanism at the battery end. When the battery pack is unexpectedly displaced, the automatic power-off circuit can quickly cut off the power supply, fundamentally preventing serious safety hazards such as poor contact, sparks, short circuits, and even fires caused by battery physical displacement, and comprehensively ensuring the operational safety and reliability of various battery-powered devices.

[0040] The following is a detailed explanation of how the battery displacement automatic power-off circuit 20 automatically cuts off power when the battery is displaced.

[0041] Figure 2 This is a schematic diagram of the automatic power-off circuit for battery displacement provided in one embodiment of this application. Figure 2 As shown, the battery displacement automatic power-off circuit 20 provided in this embodiment includes a position detection module 201, a logic control module 202, and a loop switch module 203.

[0042] In this embodiment, the position detection module 201 includes at least two detection switches disposed at different positions of the battery assembly, which are used to collaboratively detect the installation status of the battery assembly in the device.

[0043] The position detection module 201 is the part of the battery displacement automatic power-off circuit 20 responsible for sensing the installation status of the battery pack. It includes at least two detection switches, which are cleverly positioned at different locations on the battery pack, such as the side and front of the battery compartment. Through the coordinated operation of multiple detection switches, the installation status of the battery pack inside the equipment can be comprehensively and accurately detected. When the battery pack is in a correct and stable installation position, each detection switch will exhibit a specific closed state; however, if the battery pack experiences displacement, loosening, or other abnormalities, at least one switch will spring open due to loss of pressure, changing the closed state of the detection switches and providing accurate information for subsequent logical judgments.

[0044] In some embodiments, the detection switch is a mechanical switch, a micro switch, or a resilient metal contact.

[0045] To adapt to different scenarios in practical applications, the position detection module 201 employs a variety of detection switches. Mechanical switches or micro switches provide clear and reliable on / off state signals through direct physical pressing and releasing. That is, when the battery component's position changes, triggering the relevant mechanical structure, it can change its closed state. These switches are inexpensive and robust. Compared to mechanical switches, micro switches are more sensitive; they can react quickly to minute displacements of the battery component through internal micro-movements, thereby changing their on / off state. Elastic metal contacts utilize their own deformation characteristics to achieve contact, eliminating the need for a separate button structure. They maintain contact and conduction when the battery component is in the correct installation position; once the battery component shifts, causing the contacts to separate, the circuit is broken. Using elastic metal contacts as detection switches helps achieve a thinner and lighter design. These different types of switches can effectively convert the physical displacement state of the battery into an electrical signal recognizable by the circuit, providing diverse and reliable implementation paths for core protection functions.

[0046] The logic control module 202 includes a first input terminal, a second input terminal, and an output terminal. Its first input terminal is connected to the positive terminal and the positive output terminal of the battery assembly, respectively, to acquire power supply information from the battery assembly. Its second input terminal is connected to the output terminal of the position detection module 201. The logic control module 202 receives signals from the position detection module 201 regarding the battery assembly's installation status, performs comprehensive analysis and logical judgment on the closing states of each detection switch, and then outputs corresponding control signals.

[0047] Specifically, when all detection switches are closed simultaneously, the second input terminal of the logic control module 202 is pulled low by all the closed detection switches, indicating that the battery is installed correctly. It then outputs a first signal (high level) to initiate power supply. Conversely, when any detection switch is opened, causing the second input terminal to go high, it quickly outputs a second signal (low level), issuing a command to cut off the power supply, thus converting the physical displacement state into a precise control signal. This control signal acts like an "instruction," directing the loop switch module 203 to perform the operation of turning the battery power supply loop on or off.

[0048] The loop switch module 203 is responsible for ultimately controlling the on / off state of the battery power supply circuit. It is connected in series in the power supply circuit of the battery pack, and its control terminal is connected to the output terminal of the logic control module 202. It is used to turn on or off the battery power supply circuit according to the control signal. Specifically, when all detection switches are closed simultaneously, the loop switch module 203 responds to the logic control module 202 by outputting a first signal, controlling the loop switch module 203 to turn on, quickly establishing the battery power supply circuit so that the battery pack can supply power to the equipment normally; when any detection switch is open, the loop switch module 203 responds to the logic control module 202 by outputting a second signal, immediately controlling the loop switch module 203 to turn off, cutting off the battery power supply circuit, thereby avoiding potential safety hazards caused by abnormal conditions such as battery displacement.

[0049] Figure 3 This is a schematic diagram of the automatic power-off circuit for battery displacement provided in another embodiment of this application. Figure 3 As shown, this embodiment, based on any of the above embodiments, also includes a battery protection module 204.

[0050] In this embodiment, the battery protection module 204 is connected in the power supply circuit of the battery module to monitor the charging and discharging current during the charging and discharging process of the battery module, and disconnects the power supply circuit of the battery module when the charging and discharging current exceeds the threshold.

[0051] Based on the existing battery displacement automatic power-off circuit embodiment described above, a battery protection module 204 is further added. This module, acting as a second line of defense, is connected to the power supply circuit of the battery assembly and is used to monitor the current state of the battery during charging and discharging in real time. When the charging and discharging current exceeds a preset safety threshold, it often indicates that the battery may be in a dangerous state such as overcharging, over-discharging, or short circuit. At this time, the battery protection module 204 will immediately trigger the protection mechanism to disconnect the power supply circuit of the battery assembly, thereby preventing the battery from being damaged by excessive current. Complementing the displacement detection function, together they form a comprehensive, multi-layered protection system from physical installation safety to electrical operation safety, further improving the safety and stability of battery use and providing more reliable protection for the entire battery assembly and related equipment.

[0052] In summary, the automatic power-off circuit for battery displacement provided in any of the above embodiments senses the installation status of the battery pack through the detection switches at different positions of the position detection module. Based on this, the logic control module and the circuit switch module quickly make decisions to promptly switch the power supply circuit on and off, effectively eliminating the risks of poor contact, sparks, and short circuits caused by loose batteries. Its optional battery protection module further provides protection against electrical anomalies such as overcharge, over-discharge, and overcurrent, jointly constructing a dual protection system from physical installation safety to electrical usage safety. This significantly improves the safety and reliability of various portable electronic devices and power tools, and the overall circuit structure is simple, easy to integrate, and has significant cost advantages.

[0053] Figure 4 This is a circuit diagram of an automatic power-off circuit for battery displacement according to one embodiment of this application. Figure 4 As shown, the automatic power-off circuit for battery displacement provided in this embodiment includes a position detection module 201, a logic control module 202, a loop switch module 203, and an optional battery protection module 204.

[0054] In this embodiment, the position detection module 201 includes a first current-limiting resistor R1, a first detection switch K1, and a second detection switch K2. Specifically, the first end of the first current-limiting resistor R1 is connected to the input terminal of the position detection module 201; the first end of the first detection switch K1 is connected to the second end of the first current-limiting resistor R1; the first end of the second detection switch K2 is connected to the second end of the first detection switch K1, the second end of the second detection switch K2 is connected to the output terminal of the position detection module 201, and the second end of the second detection switch K2 is grounded.

[0055] The logic control module 202 includes a pull-up resistor R2, a second current-limiting resistor R3, and a first switching transistor Q1. Specifically, the first end of the pull-up resistor R2 is connected to the first input terminal of the logic control module 202, i.e., connected to the positive terminal of the battery cell; the second end of the pull-up resistor R2 is connected to the second input terminal of the logic control module 202, i.e., connected to the output terminal of the position detection module 201, and is used to acquire a signal characterizing the closed state of the detection switch; the first end of the second current-limiting resistor R3 is connected to the first end of the pull-up resistor R2; the control terminal of the first switching transistor Q1 is connected to the second end of the pull-up resistor R2; the first end of the first switching transistor Q1 is connected to the second end of the second current-limiting resistor R3; and the second end of the first switching transistor Q1 is connected to the output terminal of the logic control module 202, i.e., connected to the control terminal of the loop switch module 203, and outputs a control signal to it.

[0056] The loop switch module 203 includes a second switch transistor Q2. Specifically, the control terminal of the second switch transistor Q2 is connected to the control terminal of the loop switch module 203, that is, connected to the second terminal of the first switch transistor Q1. The first terminal of the second switch transistor Q2 is connected to the negative terminal BAT- of the battery pack, that is, the negative circuit. The second terminal of the second switch transistor Q2 is connected to the negative output terminal of the battery pack.

[0057] The battery protection module 204 includes a battery protection chip U1, a fourth resistor R4, a fifth resistor R5, and a third switch Q3. Specifically, the power supply terminal VDD of the battery protection chip U1 is connected to the positive terminal BAT+ of the battery pack; the first terminal of the fourth resistor R4 is connected to the discharge control terminal DO of the battery protection chip U1; the first terminal of the fifth resistor R5 is connected to the charging control terminal CO of the battery protection chip U1; the third switch Q3 is a pair of dual N-MOS transistors integrated together, the first control terminal of the third switch Q3 is connected to the second terminal of the fourth resistor R4, the second control terminal of the third switch Q3 is connected to the second terminal of the fifth resistor R5, the first terminal of the third switch Q3 is connected to the negative terminal BAT- of the battery pack, and the second terminal of the third switch Q3 is connected to the input terminal of the loop switch module 203, that is, connected to the first terminal of the second switch Q2.

[0058] In some embodiments, the battery protection module 204 further includes a first capacitor C1, a second capacitor C2, and a third capacitor C3 for filtering, and a sixth resistor R6 for current sampling. Specifically, the first terminal of the first capacitor C1 is connected to the power supply terminal VDD of the battery protection chip U1, and the second terminal of the first capacitor C1 is connected to the ground terminal VSS of the battery protection chip U1; the first terminal of the sixth resistor R6 is connected to the voltage monitoring terminal VM of the battery protection chip U1, and the second terminal of the sixth resistor R6 is connected to the second terminal of the third switch Q3; the second capacitor C2 and the third capacitor C3 are connected in series, the first terminal of the second capacitor C2 is connected to the first terminal of the third switch Q3, and the second terminal of the third capacitor C3 is connected to the second terminal of the third switch Q3.

[0059] In some embodiments, the automatic power-off circuit for battery displacement also includes a Zener diode T1 disposed at the output port of the battery assembly. Specifically, the first end of the Zener diode T1 is connected to the positive output terminal, and the second end of the Zener diode T1 is grounded.

[0060] based on Figure 4 The circuit structure and operation process of the automatic power-off circuit for battery displacement are as follows:

[0061] 1. Normal installation status (power supply circuit is on)

[0062] When the battery assembly is correctly installed into the device, the battery assembly body simultaneously presses the first detection switch K1 located on its side and the second detection switch K2 located on its front or back, causing both to close at the same time.

[0063] When the first detection switch K1 and the second detection switch K2 are in the closed state, they are connected in series with the current-limiting resistor R1, establishing a conductive path between the input terminal of the logic control module 202 (i.e., the gate of the first switch Q1) and ground (GND). At this time, the gate voltage of the first switch Q1 is pulled down to close to 0V (low level). Although one end of the pull-up resistor R2 is connected to the positive terminal BAT+ of the battery module, the level is locked at a low potential due to the lower pull-down impedance. The gate-source voltage (Vgs) of the first switch Q1 (N-MOS transistor) meets the conduction condition, and the first switch Q1 is in the conducting state.

[0064] Furthermore, the first switch Q1 outputs an effective "on" signal (a high level that satisfies Vgs > threshold voltage) to the gate of the second switch Q2 (N-MOS transistor) of the loop switch module 203, so that the second switch Q2 is fully turned on, forming a low-resistance path between the negative terminal BAT- of the battery and the negative output terminal of the device.

[0065] Furthermore, the positive terminal BAT+ of the battery pack is powered to the positive terminal of the device through the battery protection chip U1 and dual MOSFETs Q3, while the negative terminal BAT- of the battery pack forms a complete circuit through the conducting second switch Q2. The battery pack can normally power the device or receive charging. The battery protection chip U1 and dual N-MOSFETs D1 monitor the charging and discharging process normally, providing overcurrent, undervoltage, and other protections.

[0066] 2. Abnormal displacement condition (power supply circuit disconnected)

[0067] When the battery assembly is displaced in any direction within the device, the circuit will enter a protection state when at least one of the first detection switch K1 and the second detection switch K2 is popped open.

[0068] When the first detection switch K1 or the second detection switch K2 is in the open state, the previously formed low-impedance pull-down path from the gate of the first switch Q1 to ground is cut off. At this time, the positive terminal BAT+ of the battery module directly charges the gate of the first switch Q1 through the pull-up resistor R2, causing its voltage to rise rapidly to a high level close to BAT+. This high-level signal will cause the first switch Q1 to enter the cut-off state, ultimately causing its output control signal to flip.

[0069] Furthermore, if the gate-source voltage (Vgs) of the second switch Q2 becomes 0V or the conduction condition is not met, the second switch Q2 immediately changes from the on state to the off state. This is equivalent to connecting an open switch in series in the negative terminal circuit of the battery, completely cutting off the current path. Even if the positive terminal BAT+ of the battery pack is properly connected, the device will immediately stop working due to the interruption of the current path, thus achieving rapid and safe automatic power-off and effectively preventing safety hazards such as sparks, arcs, or abnormal equipment operation caused by poor contact.

[0070] 3. Cooperative operation of the battery protection module (including battery protection chip U1 and dual N-MOS transistors Q3)

[0071] The battery protection chip U1 and dual N-MOS transistors Q3 constitute another layer of protection, responsible for monitoring the battery's electrical state (such as overcharge, over-discharge, overcurrent, and short circuit). The charging and discharging current of the battery pack during charging and discharging is monitored through the charging and discharging port of the battery protection chip U1. When the charging and discharging current is normal, the battery protection chip U1 controls the third switch Q3 to conduct, without affecting the circuit; when the charging and discharging current is abnormal, i.e., when an electrical fault occurs, the battery protection chip U1 outputs a signal to control the third switch Q3 to turn off, thus cutting off the current in the negative terminal circuit. Independent of the displacement protection mechanism yet working in conjunction with it, this provides dual safety assurance for the battery from physical installation to electrical use.

[0072] In addition, the first capacitor C1 is used for filtering to ensure the stability of the power supply to the battery protection chip U1. The second capacitor C2 and the third capacitor C3 are connected in series across the third switching transistor Q3, which also serve to filter and stabilize the voltage, ensuring the stable operation of the third switching transistor Q3. The Zener diode T1 is located at the output port of the battery module. When the output voltage fluctuates, the Zener diode T1 will stabilize the output voltage at a specific value, providing a stable power supply to the device and ensuring its normal operation.

[0073] It can be seen that by working together with the two spatially orthogonal detection switches, the first detection switch K1 and the second detection switch K2, abnormal displacement of the battery assembly in any direction can be effectively detected. The control logic of this circuit is "AND" logic, that is, power supply is only allowed when the first detection switch K1 and the second detection switch K2 are closed at the same time. In other words, reliable electromechanical linkage protection is achieved with a simple circuit, which greatly improves the safety of built-in or external battery devices.

[0074] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art, under the guidance of this application, can make several simple deductions, modifications or substitutions based on the spirit of this application and the scope of protection of the claims without departing from the spirit of this application and the claims. All of these are within the protection scope of this application.

Claims

1. An automatic power-off circuit for battery displacement, integrated into a battery assembly, wherein the battery assembly is installed in an electronic device and supplies power to the electronic device through a positive output terminal and a negative output terminal, characterized in that, include: The position detection module includes at least two detection switches located at different positions of the battery assembly, which are used to collaboratively detect the installation status of the battery assembly within the device. The logic control module has a first input terminal connected to both the positive terminal and the positive output terminal of the battery assembly, and a second input terminal connected to the output terminal of the position detection module, for outputting control signals according to the closed state of the detection switch; A circuit switch module is connected in series in the power supply circuit of the battery assembly, and its control terminal is connected to the output terminal of the logic control module. It is used to turn on or off the power supply circuit of the battery according to the control signal. Specifically, when all the detection switches are closed simultaneously, the logic control module outputs a first signal to turn on the loop switch module and establish a battery power supply circuit; when any of the detection switches is open, the logic control module outputs a second signal to turn off the loop switch module and cut off the battery power supply circuit.

2. The automatic power-off circuit for battery displacement according to claim 1, characterized in that, The detection switch is a mechanical switch, a micro switch, or a flexible metal contact.

3. The battery displacement automatic power-off circuit according to claim 2, characterized in that, The position detection module includes a first current-limiting resistor R1, a first detection switch K1, and a second detection switch K2; The first end of the first current-limiting resistor R1 is connected to the input end of the position detection module; the first end of the first detection switch K1 is connected to the second end of the first current-limiting resistor R1; the first end of the second detection switch K2 is connected to the second end of the first detection switch K1, and the second end of the second detection switch K2 is connected to the output end of the position detection module.

4. The automatic power-off circuit for battery displacement according to claim 1, characterized in that, The logic control module includes a pull-up resistor R2, a second current-limiting resistor R3, and a first switching transistor Q1; The first end of the pull-up resistor R2 is connected to the first input terminal of the logic control module, and the second end of the pull-up resistor R2 is connected to the second input terminal of the logic control module; the first end of the second current-limiting resistor R3 is connected to the first end of the pull-up resistor R2; the control terminal of the first switch Q1 is connected to the second end of the pull-up resistor R2, the first end of the first switch Q1 is connected to the second end of the second current-limiting resistor R3, and the second end of the first switch Q1 is connected to the output terminal of the logic control module.

5. The battery displacement automatic power-off circuit according to claim 1, characterized in that, The circuit switch module includes a second switch transistor Q2; The control terminal of the second switch Q2 is connected to the control terminal of the circuit switch module, the first terminal of the second switch Q2 is connected to the negative terminal of the battery assembly, and the second terminal of the second switch Q2 is connected to the negative output terminal.

6. The automatic power-off circuit for battery displacement according to claim 1, characterized in that, It also includes a battery protection module, which is connected in the power supply circuit of the battery assembly to monitor the charging and discharging current during the charging and discharging process of the battery assembly, and disconnect the power supply circuit of the battery assembly when the charging and discharging current exceeds a threshold.

7. The automatic power-off circuit for battery displacement according to claim 6, characterized in that, The battery protection module includes a battery protection chip U1, a fourth resistor R4, a fifth resistor R5, and a third switch Q3; The power supply terminal of the battery protection chip U1 is connected to the positive terminal of the battery assembly; the first terminal of the fourth resistor R4 is connected to the discharge control terminal of the battery protection chip U1; the first terminal of the fifth resistor R5 is connected to the charging control terminal of the battery protection chip U1; the third switch Q3 is a pair of dual N-MOS transistors integrated together, the first control terminal of the third switch Q3 is connected to the second terminal of the fourth resistor R4, the second control terminal of the third switch Q3 is connected to the second terminal of the fifth resistor R5, the first terminal of the third switch Q3 is connected to the negative terminal of the battery assembly, and the second terminal of the third switch Q3 is connected to the input terminal of the loop switch module.

8. The battery displacement automatic power-off circuit according to claim 7, characterized in that, The battery protection module also includes a first capacitor C1, a sixth resistor R6, a second capacitor C2, and a third capacitor C3; The first terminal of the first capacitor C1 is connected to the power supply terminal of the battery protection chip U1, and the second terminal of the first capacitor C1 is connected to the ground terminal of the battery protection chip U1; the first terminal of the sixth resistor R6 is connected to the voltage monitoring terminal of the battery protection chip U1, and the second terminal of the sixth resistor R6 is connected to the second terminal of the third switch Q3; the second capacitor C2 and the third capacitor C3 are connected in series, the first terminal of the second capacitor C2 is connected to the first terminal of the third switch Q3, and the second terminal of the third capacitor C3 is connected to the second terminal of the third switch Q3.

9. The battery displacement automatic power-off circuit according to claim 1, characterized in that, It also includes a Zener diode T1, the first end of which is connected to the positive output terminal, and the second end of which is grounded.

10. A battery assembly, characterized in that, It includes battery cells and an automatic power-off circuit for battery displacement as described in any one of claims 1 to 9.

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