Battery detection circuit, battery pack and electric device

Abstract

The application provides a battery detection circuit, a battery pack and a power consumption device. The battery detection circuit comprises a battery, a switching circuit, a logic control circuit and a detection circuit. The first end of the switching circuit is electrically connected with the battery. The second end of the switching circuit is used for being electrically connected with the power consumption device. The logic control circuit is connected with the switching circuit. The detection circuit is connected with the logic control circuit. The detection circuit is used for detecting whether the battery is installed in the power consumption device. The logic control circuit is used for outputting a level signal to the switching circuit according to a detection signal of the detection circuit, so as to control the switching circuit to switch between a closed state and an open state. The battery detection circuit can effectively avoid the abnormal discharge.

Description

Technical Field

[0001] This application relates to the field of battery circuit protection technology, specifically to battery detection circuits, battery packs, and electrical equipment. Background Technology

[0002] Using replaceable batteries as a power source can improve the ease of use of portable devices such as e-cigarettes, Bluetooth wearables, mobile phones, and tablets.

[0003] In related technologies, batteries are prone to abnormal discharge after being removed from portable devices. Utility Model Content

[0004] Embodiments of this application provide a battery detection circuit, a battery pack, and an electrical device that can improve the technical problem of batteries being prone to abnormal discharge.

[0005] In a first aspect, embodiments of this application provide a battery detection circuit, including:

[0006] Battery;

[0007] A switching circuit, wherein a first terminal of the switching circuit is electrically connected to the battery, and a second terminal of the switching circuit is used for electrical connection to an electrical device;

[0008] The logic control circuit is connected to the switching circuit.

[0009] A detection circuit is connected to the logic control circuit. The detection circuit is used to detect whether the battery is installed in the electrical device. The logic control circuit is used to output a level signal to the switching circuit according to the detection signal of the detection circuit, so as to control the switching circuit to switch between a closed state and an open state.

[0010] In one embodiment, the detection circuit includes a level detection module and a transistor. The emitter of the transistor is connected to the level detection module, and the collector of the transistor is connected to the positive or negative terminal of the electrical device. The level detection module is connected to the logic control circuit. The level detection module is used to detect high and low level signals and output a feedback signal. The logic control circuit is used to control the switching circuit to switch between a closed state and an open state according to the feedback signal.

[0011] In one embodiment, the battery detection circuit further includes a control chip connected to the battery, the control chip including the logic control circuit and the detection circuit.

[0012] In one embodiment, the transistor is an NPN transistor, the emitter of the transistor is grounded, and the base of the transistor is connected to the power supply port of the control chip.

[0013] In one embodiment, when the battery is installed in the electrical device, the collector of the transistor is electrically connected to the positive terminal of the electrical device;

[0014] When the level detection module detects a high level, it outputs a feedback signal to the logic control circuit, so that the logic control circuit outputs a signal to drive the switching circuit to close.

[0015] In one embodiment, the detection circuit further includes a first capacitor, a first terminal of which is connected to the emitter of the transistor, and a second terminal of which is grounded.

[0016] In one embodiment, the transistor is a PNP transistor, the base of the transistor is grounded, and the emitter of the transistor is connected to the power supply port of the control chip.

[0017] In one embodiment, when the battery is installed in the electrical device, the collector of the transistor is electrically connected to the negative terminal of the electrical device;

[0018] When the level detection module detects a low level, it outputs a feedback signal to the logic control circuit, so that the logic control circuit outputs a signal to drive the switching circuit to close.

[0019] In one embodiment, the detection circuit further includes a second capacitor, the first terminal of which is connected to the collector of the transistor, and the second terminal of which is grounded.

[0020] In one embodiment, the switching circuit includes a MOS transistor, the gate of which is connected to the logic control circuit, the source of which is connected to the negative terminal of the battery, and the drain of which is connected to the negative terminal of the electrical device.

[0021] Secondly, embodiments of this application provide a battery pack including the battery detection circuit described above.

[0022] Thirdly, embodiments of this application provide an electrical device including the battery pack described above.

[0023] The beneficial effects of the embodiments of this application are as follows:

[0024] In the embodiments of this application, the detection circuit can determine whether the battery is installed in the electrical device. When it is determined that the battery is installed in the electrical device, the logic control circuit controls the switch circuit to be in a closed state, allowing the battery to discharge normally. When the detection circuit detects that the battery is not installed in the electrical device, i.e., the battery has been removed from the electrical device, the detection circuit outputs a corresponding detection signal to the logic control circuit, which then outputs a corresponding level signal to the switch circuit. Upon receiving the level signal, the switch circuit switches to an open state to disconnect the battery's power supply circuit. In other words, this application uses a detection circuit to detect whether the battery is installed in the electrical device. When it detects that the battery is not installed in the electrical device, the logic control circuit outputs a corresponding level signal to the switch circuit based on the detection signal from the detection circuit, causing the switch circuit to switch to an open state, preventing the battery from continuing to discharge, and effectively avoiding abnormal discharge. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is one of the structural schematic diagrams of the battery provided in the embodiments of this application;

[0027] Figure 2 This is provided by the embodiments of this application. Figure 1 Circuit diagram of the detection circuit;

[0028] Figure 3 This is a second schematic diagram of the battery structure provided in the embodiments of this application;

[0029] Figure 4 Provided for embodiments of this application Figure 3 Circuit diagram of the detection circuit. Detailed Implementation

[0030] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0031] The following is combined Figures 1 to 4 This application describes the battery detection circuit, battery pack, and electrical device.

[0032] According to the embodiments of the first aspect of this application, such as Figure 1 and Figure 3 The battery detection circuit includes a battery 1, a switch circuit 2, a logic control circuit 4, and a detection circuit 5. The first end of the switch circuit 2 is electrically connected to the battery 1, and the second end of the switch circuit 2 is used to electrically connect to the electrical device 3. The logic control circuit 4 is connected to the switch circuit 2, and the detection circuit 5 is connected to the logic control circuit 4. The detection circuit 5 is used to detect whether the battery 1 is installed in the electrical device 3. The logic control circuit 4 is used to output a level signal to the switch circuit 2 according to the detection signal of the detection circuit 5, so as to control the switch circuit 2 to switch between the closed state and the open state.

[0033] According to the battery detection circuit of this application embodiment, the detection circuit 5 can detect whether the battery 1 is installed in the electrical device 3. When it is determined that the battery 1 is installed in the electrical device 3, the logic control circuit 4 controls the switch circuit 2 to be in a closed state, so that the battery 1 can discharge normally. When the detection circuit 5 detects that the battery 1 is not installed in the electrical device 3, that is, when the battery 1 is removed from the electrical device 3, the detection circuit 5 will output a corresponding detection signal to the logic control circuit 4, so that the logic control circuit 4 can output a corresponding level signal to the switch circuit 2. After receiving the level signal, the switch circuit 2 will switch to an open state to disconnect the power supply circuit of the battery 1. In other words, this application detects whether the battery 1 is installed in the electrical device 3 through the detection circuit 5. When it is detected that the battery 1 is not installed in the electrical device 3, the logic control circuit 4 will output a corresponding level signal to the switch circuit 2 according to the detection signal of the detection circuit 5, so that the switch circuit 2 switches to an open state to prevent the battery 1 from continuing to discharge, which can effectively avoid the occurrence of abnormal discharge.

[0034] In some examples, the detection signal output by the detection circuit 5 is, for example, a high or low level signal.

[0035] Understandably, in related technologies, when battery 1 is removed from electrical device 3, the output voltage of the removed battery 1 is normal. However, if the overcurrent value setting of battery 1 is unreasonable or the short-circuit protection fails, contact between the output voltage pin and a foreign metal object will cause abnormal phenomena such as battery 1 overheating. Furthermore, if the user accidentally touches the positive and negative terminals of battery 1 with a metal object, it will also cause injury to the user, posing a high safety risk. This application, however, uses a detection circuit 5 to detect whether battery 1 is installed in electrical device 3. Once it is detected that battery 1 has been removed from electrical device 3, the control switch circuit 2 is in an open state to disconnect the discharge circuit of battery 1, preventing battery 1 from continuing to discharge. This effectively prevents abnormal discharge of battery 1, avoids abnormal phenomena such as battery 1 overheating due to contact with foreign metal objects, prevents abnormal discharge from causing harm to the user, and improves safety.

[0036] In some embodiments, such as Figure 2 and Figure 4 The detection circuit 5 includes a level detection module 51 and a transistor Q1. The emitter of the transistor Q1 is connected to the level detection module 51, and the collector of the transistor Q1 is connected to the positive or negative terminal of the electrical device 3. The level detection module 51 is connected to the logic control circuit 4. The level detection module 51 is used to detect high and low level signals and output feedback signals. The logic control circuit 4 is used to control the switching circuit 2 to switch between closed and open states according to the feedback signals.

[0037] It is understandable that by electrically connecting transistor Q1 between the device 3 and the level detection module 51, when battery 1 is installed in the device 3, transistor Q1 will also be connected to either the positive or negative terminal of the device 3; when battery 1 is removed from the device 3, transistor Q1 will also be disconnected from the device 3. That is, when battery 1 is installed in the device 3, the level detection module 51 detects one of the high-level or low-level signals; when battery 1 is not installed in the device 3, the level detection module detects the other of the high-level or low-level signals. The level detection module 51 can output a corresponding feedback signal to the logic control circuit 4 based on the detected level signal, so that the logic control circuit 4 can control the state switching of the switching circuit 2 according to the feedback signal.

[0038] In some examples, a high-level signal detected by the level detection module 51 indicates that battery 1 is installed in electrical device 3. Alternatively, a low-level signal detected by the level detection module 51 indicates that battery 1 is installed in electrical device 3.

[0039] In some embodiments, such as Figure 1and Figure 3 The battery detection circuit also includes a control chip 6, which is connected to the battery 1. The control chip 6 includes a logic control circuit 4 and a detection circuit 5.

[0040] Understandably, integrating the logic control circuit 4 and the detection circuit 5 into the control chip 6 improves the integration of the battery detection circuit.

[0041] In some embodiments, such as Figure 1 and Figure 2 Transistor Q1 is an NPN transistor. The emitter of transistor Q1 is grounded, and the base of transistor Q1 is connected to the power supply port of control chip 6.

[0042] Understandably, the transistor Q1 in the detection circuit 5 is an NPN transistor Q1, with its emitter directly grounded (GND), its base connected to the power supply port of the control chip 6 (e.g., the VCC pin of the control chip 6 or its internal power supply node), and its collector connected to either the positive or negative terminal of the device 3 (depending on the circuit design). The level detection module 51 is integrated inside the control chip 6 and is used to monitor the voltage state of the base or collector of transistor Q1.

[0043] Understandably, this application achieves accurate identification of the battery 1's installation status through the switching characteristics of the NPN transistor Q1 and the coordinated operation of the level detection module 51. When the battery 1 is disconnected from the electrical device 3, the switching circuit 2 cuts off the discharge circuit within milliseconds, completely eliminating the risk of short circuits caused by the battery 1's electrodes contacting metallic foreign objects. At the same time, it avoids the drawbacks of relying on mechanical switches or complex protection circuits in traditional solutions, significantly improving system safety and reliability.

[0044] In some examples, the power supply port of the control chip 6 is electrically connected to a filter circuit to prevent the transistor Q1 from malfunctioning due to transient interference.

[0045] In some embodiments, when the battery 1 is installed in the electrical device 3, the collector of the transistor Q1 is electrically connected to the positive terminal of the electrical device 3.

[0046] When the level detection module 51 detects a high level, it outputs a feedback signal to the logic control circuit 4, so that the logic control circuit 4 outputs a signal to drive the switch circuit 2 to close.

[0047] Understandably, when battery 1 is installed in device 3, the collector of transistor Q1 forms a physical connection with the positive terminal of device 3 (e.g., through metal contacts or terminals). At this time, the high voltage at the positive terminal of device 3 is directly applied to the input of the level detection module 51 through its collector. The level detection module 51 detects the high-level signal at its input and immediately sends a feedback signal to the logic control circuit 4. The logic control circuit 4 responds to the feedback signal and outputs a high-level drive signal to the switching circuit 2, turning it on. This closes the power supply loop between battery 1 and device 3, allowing battery 1 to discharge normally.

[0048] When battery 1 is removed from device 3, the physical connection between the collector of transistor Q1 and the positive terminal of device 3 is broken. At this time, the collector of transistor Q1 is in a floating state due to the loss of external high-level input, and the voltage at the input terminal of level detection module 51 is pulled down to ground potential through the pull-down resistor inside control chip 6. After detecting the low-level signal, level detection module 51 feeds it back to logic control circuit 4. Logic control circuit 4 then outputs a low-level signal to switching circuit 2, forcing switching circuit 2 to turn off, completely cutting off the discharge circuit of battery 1 and preventing short circuit caused by contact between the electrodes of battery 1 and foreign objects.

[0049] Understandably, this application achieves passive detection of the battery 1's installation status (without requiring additional sensors) through the physical linkage design between the collector of transistor Q1 and the positive terminal of the electrical device 3. When battery 1 is correctly installed, a high-level signal is transmitted to the level detection module 51, triggering the switching circuit 2 to conduct, with a system response speed reaching the microsecond level; during removal, electrical isolation and pull-down resistors quickly cut off the circuit, fundamentally eliminating the short-circuit risk when the battery 1 electrodes are exposed.

[0050] In some examples, the base is connected to the control chip 6VCC via a current-limiting resistor to ensure that the transistor Q1 is in a saturated conduction state when the battery 1 is installed, thereby enhancing the reliability of the electrical connection between the collector and the positive terminal of the electrical device 3.

[0051] Specifically, the detection circuit 5 also includes a first capacitor C1, the first end of which is connected to the emitter of the transistor Q1, and the second end of the first capacitor C1 is grounded.

[0052] Understandably, the first capacitor C1 can effectively prevent signal jitter when the transistor Q1 is turned on, and has a certain ESD protection capability.

[0053] In some embodiments, such as Figure 3 and Figure 4 Transistor Q1 is a PNP type transistor. The base of transistor Q1 is grounded, and the emitter of transistor Q1 is connected to the power supply port of control chip 6.

[0054] Understandably, the detection circuit 5 uses a PNP transistor Q1, with its base grounded (GND), its emitter connected to the power supply port of the control chip 6 (such as the VCC pin or internal power supply node), and its collector mechanically / electrically connected to the positive terminal of the device 3. The level detection module 51 detects the voltage state of the collector and feeds back the detected high or low level to the logic control circuit 4. The logic control circuit 4 then outputs a corresponding drive signal to the switching circuit 2 to control the on / off state of the switching circuit 2.

[0055] Understandably, this solution achieves polarity reversal protection through the reverse conduction characteristic of the PNP transistor Q1 and the coordination of the level detection module 51. When battery 1 is installed, transistor Q1 is forced to conduct by grounding its base, pulling the collector level low to trigger the switch to close; when removed, the pull-up resistor is used to quickly pull the level high to cut off the circuit. Compared to the NPN type solution, this design has stronger anti-interference capability in scenarios such as reverse connection of battery 1 or power fluctuations, while the low on-resistance of the PMOS transistor helps reduce energy loss in the power supply circuit.

[0056] In some examples, the level detection module 51 is integrated inside the control chip 6, and its input is connected to the collector of transistor Q1 through a pull-up resistor to detect the voltage state of the collector. The switching circuit 2 is composed of a PMOS transistor, whose gate is controlled by the output signal of the logic control circuit 4, and whose source and drain are connected to the positive terminal of battery 1 and the power supply input terminal of the device 3, respectively.

[0057] In some embodiments, when the battery 1 is installed in the electrical device 3, the collector of the transistor Q1 is electrically connected to the negative terminal of the electrical device 3.

[0058] When the level detection module 51 detects a low level, it outputs a feedback signal to the logic control circuit 4, so that the logic control circuit 4 outputs a signal to drive the switch circuit 2 to close.

[0059] Understandably, when battery 1 is installed in device 3, the collector of transistor Q1 forms a physical connection with the positive terminal of device 3 (e.g., through metal contacts or plug terminals). At this time, the high voltage (VBAT) of the positive terminal of device 3 is directly applied to the collector of transistor Q1. Since the base of PNP transistor Q1 is grounded (GND) and the emitter is connected to the power supply port (VCC) of control chip 6, the voltage between the emitter and base of transistor Q1 meets the conduction condition (VEB>0.7V), and transistor Q1 enters a saturated conduction state. After conduction, the collector voltage is pulled down to near ground potential (GND), causing the input of level detection module 51 to detect a low-level signal through pull-up resistor R1. Level detection module 51 feeds back the low level to logic control circuit 4, which then outputs a low-level drive signal to switching circuit 2, turning on switching circuit 2, closing the power supply loop between battery 1 and device 3, and allowing battery 1 to discharge normally.

[0060] When battery 1 is removed from device 3, the connection between the collector of transistor Q1 and the positive terminal of device 3 is broken. At this time, the collector circuit is open, and transistor Q1 is in the off state because it cannot generate collector current. The input terminal of the level detection module 51 is pulled to a high level (close to VCC voltage) through a pull-up resistor. After detecting the high-level signal, it feeds back to the logic control circuit 4. The logic control circuit 4 immediately outputs a high-level signal to the switching circuit 2, forcing the switching circuit 2 to turn off, completely cutting off the discharge circuit of battery 1 and preventing the electrodes from coming into contact with foreign objects and causing a short circuit.

[0061] In some examples, the base is grounded through a resistor to ensure that the PNP transistor Q1 conducts reliably when battery 1 is installed; the emitter is directly connected to the control chip 6VCC, simplifying the power supply design.

[0062] Specifically, the detection circuit 5 also includes a second capacitor C2, the first end of which is connected to the collector of the transistor Q1, and the second end of which is grounded.

[0063] Understandably, the second capacitor C2 can effectively prevent signal jitter when the transistor Q1 is turned on, and has a certain ESD protection capability.

[0064] In some embodiments, the switching circuit 2 includes a MOSFET, the gate of which is connected to a logic control circuit, the source of which is connected to the negative terminal of the battery 1, and the drain of which is connected to the negative terminal of the electrical device 3.

[0065] Understandably, when the detection circuit 5 confirms that battery 1 is installed in the device 3, the logic control circuit 4 outputs a high-level drive signal (e.g., 5V or battery 1 voltage VCC) to the gate of the MOSFET. Since the MOSFET is an NMOS, when the gate-source voltage (Vgs) exceeds its threshold voltage (e.g., 2.5V), the MOSFET enters the conducting state, forming a low-impedance path between the source and drain. At this time, the negative terminal (BAT-) of battery 1 is connected to the negative terminal of device 3 through the MOSFET, the battery 1-device 3 loop is closed, and battery 1 discharges normally.

[0066] When the detection circuit 5 detects that battery 1 is not installed (e.g., contacts are open) or an abnormality occurs (e.g., overcurrent, short circuit), the logic control circuit 4 outputs a low-level signal (0V or close to the source potential) to the gate of the MOSFET. At this time, the gate-source voltage (Vgs) of the MOSFET is lower than the threshold voltage, the MOSFET is quickly turned off, and the path between the source and drain is broken. The connection between the negative terminal (BAT-) of battery 1 and the negative terminal of the electrical device 3 is physically disconnected, the power supply circuit is completely disconnected, and abnormal discharge of battery 1 or short circuit caused by contact with foreign objects on the electrodes is prevented.

[0067] In some examples, the gate of the MOSFET is connected to the control port of the control chip 6.

[0068] In some cases, the MOSFET is an N-channel MOSFET (NMOS).

[0069] According to an embodiment of the second aspect of this application, the battery pack includes the battery detection circuit described above.

[0070] According to the battery pack of this application embodiment, the detection circuit 5 can detect whether the battery 1 is installed in the electrical device 3. When it is determined that the battery 1 is installed in the electrical device 3, the logic control circuit 4 controls the switch circuit 2 to be in a closed state, so that the battery 1 can discharge normally. When the detection circuit 5 detects that the battery 1 is not installed in the electrical device 3, that is, when the battery 1 is removed from the electrical device 3, the detection circuit 5 will output a corresponding detection signal to the logic control circuit 4, so that the logic control circuit 4 can output a corresponding level signal to the switch circuit 2. After receiving the level signal, the switch circuit 2 will switch to an open state to disconnect the power supply circuit of the battery 1. In other words, this application detects whether the battery 1 is installed in the electrical device 3 through the detection circuit 5. When it is detected that the battery 1 is not installed in the electrical device 3, the logic control circuit 4 will output a corresponding level signal to the switch circuit 2 according to the detection signal of the detection circuit 5, so that the switch circuit 2 switches to an open state to prevent the battery 1 from continuing to discharge, which can effectively avoid the occurrence of abnormal discharge, and thus avoid abnormal discharge of the battery pack.

[0071] According to an embodiment of the third aspect of this application, the electrical device 3 includes the battery pack described above.

[0072] According to the embodiments of this application, the detection circuit 5 can detect whether the battery 1 is installed in the electrical device. When it is determined that the battery 1 is installed in the electrical device, the logic control circuit 4 controls the switch circuit 2 to be in a closed state, so that the battery 1 can discharge normally. When the detection circuit 5 detects that the battery 1 is not installed in the electrical device, that is, when the battery 1 is removed from the electrical device, the detection circuit 5 will output a corresponding detection signal to the logic control circuit 4, so that the logic control circuit 4 can output a corresponding level signal to the switch circuit 2. After receiving the level signal, the switch circuit 2 will switch to an open state to disconnect the power supply circuit of the battery 1. In other words, this application detects whether the battery 1 is installed in the electrical device through the detection circuit 5. When it is detected that the battery 1 is not installed in the electrical device, the logic control circuit 4 will output a corresponding level signal to the switch circuit 2 according to the detection signal of the detection circuit 5, so that the switch circuit 2 switches to an open state to prevent the battery 1 from continuing to discharge, which can effectively avoid the occurrence of abnormal discharge.

[0073] It should be noted that electrical equipment can be vehicles, aircraft, or household appliances. It is important to note that the above is merely an example of electrical equipment and does not impose any specific limitations on electrical equipment 3.

[0074] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A battery detection circuit, characterized by, include: Battery; A switching circuit, wherein a first terminal of the switching circuit is electrically connected to the battery, and a second terminal of the switching circuit is used for electrical connection to an electrical device; The logic control circuit is connected to the switching circuit. A detection circuit is connected to the logic control circuit. The detection circuit is used to detect whether the battery is installed in the electrical device. The logic control circuit is used to output a level signal to the switching circuit according to the detection signal of the detection circuit, so as to control the switching circuit to switch between a closed state and an open state.

2. The battery detection circuit of claim 1, wherein, The detection circuit includes a level detection module and a transistor. The emitter of the transistor is connected to the level detection module, and the collector of the transistor is connected to the positive or negative terminal of the electrical device. The level detection module is connected to the logic control circuit. The level detection module is used to detect high and low level signals and output feedback signals. The logic control circuit is used to control the switching circuit to switch between a closed state and an open state according to the feedback signal.

3. The battery detection circuit according to claim 2, characterized in that, The battery detection circuit also includes a control chip connected to the battery. The control chip includes the logic control circuit and the detection circuit.

4. The battery detection circuit according to claim 3, characterized in that, The transistor is an NPN transistor, with its emitter grounded and its base connected to the power supply port of the control chip.

5. The battery detection circuit according to claim 4, characterized in that, When the battery is installed in the electrical device, the collector of the transistor is electrically connected to the positive terminal of the electrical device; When the level detection module detects a high level, it outputs a feedback signal to the logic control circuit, so that the logic control circuit outputs a signal to drive the switching circuit to close.

6. The battery detection circuit according to claim 5, characterized in that, The detection circuit also includes a first capacitor, the first end of which is connected to the emitter of the transistor, and the second end of which is grounded.

7. The battery detection circuit according to claim 3, characterized in that, The transistor is a PNP transistor, with its base grounded and its emitter connected to the power supply port of the control chip.

8. The battery detection circuit according to claim 7, characterized in that, When the battery is installed in the electrical device, the collector of the transistor is electrically connected to the negative terminal of the electrical device; When the level detection module detects a low level, it outputs a feedback signal to the logic control circuit, so that the logic control circuit outputs a signal to drive the switching circuit to close.

9. The battery detection circuit according to claim 8, characterized in that, The detection circuit also includes a second capacitor, the first end of which is connected to the collector of the transistor, and the second end of which is grounded.

10. The battery detection circuit according to any one of claims 1 to 9, characterized in that, The switching circuit includes a MOSFET, the gate of which is connected to the logic control circuit, the source of which is connected to the negative terminal of the battery, and the drain of which is connected to the negative terminal of the electrical device.

11. A battery pack, characterized in that, Includes the battery detection circuit as described in any one of claims 1 to 10.

12. An electrical appliance, characterized in that, Includes the battery pack as described in claim 11.

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