Plug-in protection circuit and electronic device

Abstract

The application relates to the technical field of circuit protection, in particular to a plug-in protection circuit and electronic equipment. The plug-in protection circuit is applied to a battery pack parallel connection system. The system comprises a master battery pack and at least one slave battery pack connected in sequence through a wire harness connector. A detection switch assembly is arranged on the wire harness connector, and the opening and closing of the detection switch assembly can control the on-off of first and second pins. The plug-in protection circuit comprises a master port and a detection module corresponding to the slave battery pack. The detection module comprises a first detection unit and a second detection unit. The circuit obtains the opening and closing state of the cover plate through the change of a signal, and the main circuit of the battery pack is disconnected preventively when the cover plate is opened, so that the safety of the circuit and the safety of possible personnel are protected.

Description

Technical Field

[0001] This application relates to the field of circuit protection technology, specifically to a plug-in / plug-out protection circuit and electronic device. Background Technology

[0002] In related technologies, the plug-in terminals of power harness connectors usually lack physical connection protection. If users plug and unplug the connector while it is powered on, especially under high current conditions, it is very easy to cause problems such as electric arc and short circuit, which may have an adverse impact on the safety of users and system equipment. Summary of the Invention

[0003] The embodiments of this application mainly address the technical problem of low safety when power harness connectors are plugged in and out while energized in related technologies.

[0004] To solve the above-mentioned technical problems, one technical solution adopted in this application is: providing a plug-in / plug-out protection circuit for a battery pack parallel operation system. The battery pack parallel operation system includes a main battery pack and at least one slave battery pack connected in series, with each slave battery pack sequentially connected to the previous battery pack via a corresponding wiring harness connector. The plug-in / plug-out protection circuit includes a host port and at least one detection module, with each detection module corresponding to one of the at least one slave battery pack. The main battery pack is provided with a host port for providing a low-level signal. A detection switch assembly is provided on the wiring harness connector, comprising a cover plate, a first pin, and a second pin. The first pin and the second pin are connected when the cover plate is closed and disconnected when the cover plate is opened. The detection module includes a first detection unit and a second detection unit. The first end of the first detection unit is connected to a power supply, the control end of the first detection unit is connected to the first pin, and the output end of the first detection unit is connected to a control unit. The first detection unit's control terminal also serves as a first communication terminal, used to connect to the host port of the front master battery pack via a wiring harness connector, or to connect to the second communication terminal of the front slave battery pack via a wiring harness connector; the first terminal of the second detection unit is connected to a power supply, the control terminal of the second detection unit is connected to the second pin, the output terminal of the second detection unit is connected to a controller, and the control terminal of the second detection unit also serves as a second communication terminal, used to connect to the first communication terminal of the rear slave battery pack; the first detection unit is used to output a first signal to the controller when it does not receive the low-level signal, and to provide the low-level signal to the second detection unit when it receives the low-level signal and the first pin and the second pin are connected; the second detection unit is used to output a second signal to the controller when it does not receive the low-level signal; the controller is used to control the main circuit of the current slave battery pack and all rear slave battery packs to disconnect when it receives the first signal or the second signal.

[0005] In some embodiments, the detection switch assembly further includes an elastic element disposed between the cover plate and the first pin and the second pin, the elastic element being used to contact the first pin and the second pin when the cover plate is closed, so as to connect the first pin and the second pin.

[0006] In some embodiments, the first detection unit includes a first switching subunit, which includes resistors R1 and R2, a switching transistor Q1, a diode DS1, resistors R5, R8, and R6. The first terminal of the switching transistor Q1 is connected to a power supply. The second terminal of the switching transistor Q1 is connected to the first terminal of resistor R5, the second terminal of resistor R5 is connected to the first terminal of resistor R8, the second terminal of resistor R8 is grounded, and the first terminal of resistor R8 is connected to a controller. The control terminal of the switching transistor Q1 is connected to the power supply through resistor R1, and the control terminal of the switching transistor Q1 is connected to the anode of diode DS1 through resistor R2. The cathode of diode DS1 is connected to the first pin, and the cathode of diode DS1 is connected to the first terminal of resistor R6. The second terminal of resistor R6 serves as the first communication terminal.

[0007] In some embodiments, the first detection unit further includes a first filtering subunit, which includes a resistor R7 and a capacitor C1. The first end of the resistor R8 is connected to the controller through the resistor R7, the first end of the capacitor C1 is connected to the controller, and the second end of the capacitor C1 is connected to the second end of the resistor R8.

[0008] In some embodiments, the first detection unit further includes a first clamping subunit, which includes a Schottky diode D1 and a Schottky diode D2. The anode of the Schottky diode D1 is connected to a reference power supply, the cathode of the Schottky diode D1 is connected to the first terminal of the resistor R8, the anode of the Schottky diode D2 is connected to the cathode of the Schottky diode D1, and the cathode of the Schottky diode D2 is grounded. The first clamping subunit is used to limit the voltage output by the first detection unit within a preset range.

[0009] In some embodiments, the second detection unit includes a second switching subunit, which includes resistors R3 and R4, a switching transistor Q2, a diode DS2, resistors R9, R12, and R10. The first terminal of the switching transistor Q2 is connected to a power supply. The second terminal of the switching transistor Q2 is connected to the first terminal of resistor R9, the second terminal of resistor R9 is connected to the first terminal of resistor R12, the second terminal of resistor R12 is grounded, and the first terminal of resistor R12 is connected to a controller. The control terminal of the switching transistor Q2 is connected to the power supply through resistor R3, and the control terminal of the switching transistor Q2 is connected to the anode of diode DS2 through resistor R4. The cathode of diode DS2 is connected to the second pin, and the cathode of diode DS2 is connected to the first terminal of resistor R10. The second terminal of resistor R10 serves as the second communication terminal.

[0010] In some embodiments, the second detection unit further includes a second filtering subunit, which includes a resistor R11 and a capacitor C2. The first end of the resistor R12 is connected to the controller through the resistor R11, the first end of the capacitor C2 is connected to the controller, and the second end of the capacitor C2 is connected to the second end of the resistor R12.

[0011] In some embodiments, the second detection unit further includes a second clamping subunit, which includes a Schottky diode D3 and a Schottky diode D4. The anode of the Schottky diode D3 is connected to a reference power supply, the cathode of the Schottky diode D4 is connected to the first terminal of the resistor R12, the anode of the Schottky diode D4 is connected to the cathode of the Schottky diode D3, and the cathode of the Schottky diode D4 is grounded. The second clamping subunit is used to limit the voltage output by the second detection unit within a preset range.

[0012] In some embodiments, the host port is grounded via resistor R0.

[0013] To solve the above-mentioned technical problems, another technical solution adopted in the embodiments of this application is to provide an electronic device, including the insertion and removal protection circuit as described above.

[0014] Unlike related technologies, this application provides a plug-in protection circuit for a battery pack parallel operation system. This system includes a main battery pack and at least one slave battery pack connected sequentially via a wiring harness connector. The wiring harness connector is equipped with a detection switch assembly that can control the connection / disconnection of a first pin and a second pin by opening and closing a cover. Based on this, the plug-in protection circuit includes a host port and a detection module corresponding to the slave battery pack. The detection module includes a first detection unit and a second detection unit. The first detection unit outputs a first signal to the controller when no low-level signal is received, and provides a low-level signal to the second detection unit when a low-level signal is received and the first pin and the second pin are connected. The second detection unit outputs a second signal to the controller when no low-level signal is received. The controller, upon receiving either the first or second signal, controls the main circuit of the current slave battery pack and all subsequent slave battery packs to disconnect. When the user lifts the cover, the first pin and the second pin immediately disconnect, triggering the second detection unit of the corresponding detection module to send a second signal to the controller. The controller simultaneously cuts off the main circuit of the current battery pack and all subsequent slave devices, eliminating the risk of arcing caused by hot-plugging in advance. It can also distinguish between two states: the battery pack not connected to the system and the user lifting the cover, based on whether the first detection unit obtains the low-level signal from the front end. It also achieves the step-by-step transmission of the low-level signal between the master and slave devices through cascaded communication, ensuring the preventive power-off upon lifting the cover, rather than triggering post-event protection after the user unplugs the cover while it is powered on, thus completely avoiding the risk of short circuits and leakage in high-current scenarios. Attached Figure Description

[0015] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0016] Figure 1 This is a schematic diagram illustrating an application scenario of a plug-in / plug-out protection circuit provided in an embodiment of this application; Figure 2 This is a block diagram of a plug-in / plug-out protection circuit provided in an embodiment of this application; Figure 3 This is a schematic diagram of the circuit structure of a plug-in / plug-out protection circuit provided in an embodiment of this application; Figure 4 This is a schematic diagram of the structure of a detection switch assembly for a wire harness connector provided in an embodiment of this application. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0018] It should be noted that, unless otherwise specified, the various features in the embodiments of this application can be combined with each other, all of which are within the protection scope of this application. Furthermore, although functional modules are divided in the device schematic diagram and a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device schematic diagram or the order in the flowchart.

[0019] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0020] Energy storage battery packs are often connected to external devices via power harness connectors (or similar power line plug-in terminals) during use, such as connecting to a load to charge it or connecting to a power supply to draw power. However, the plug-in terminals of the harness connectors lack protection, and if a user plugs or unplugs the device while it is energized, it can easily lead to a safety accident, especially under conditions of high current. To address this, this application provides a plug-in protection circuit for energy storage battery packs, wherein the energy storage battery pack is connected to a harness connector and is connected to a load or power supply through the harness connector.

[0021] This application provides a plug-in / plug-out protection circuit for a battery pack parallel operation system. The system includes a master battery pack and at least one slave battery pack connected in series, with each slave battery pack sequentially connected to the previous battery pack via a corresponding wiring harness connector. Taking the first slave battery pack connected to the master battery pack via a wiring harness connector as an example, please refer to... Figure 1 , Figure 1 This is a schematic diagram illustrating an application scenario of a plug-in / plug-out protection circuit provided in an embodiment of this application. As shown in the figure, taking a slave battery pack as an example, the main battery pack acts as the host, and the slave battery pack acts as an expansion pack for the host. The two are connected through a power / wiring harness connector.

[0022] In the solution provided in this application embodiment, a detection switch assembly is provided on the wire harness connector. The detection switch assembly includes a cover plate, a first pin, and a second pin. Please refer to... Figure 1The cover can be positioned at the connection point between the expansion pack and the main unit (corresponding to the flip-cover area in the diagram). The first and second pins (not shown in the diagram) are configured to be connected when the cover is closed and disconnected when the cover is opened. For example, assuming the battery pack and main battery pack are currently connected via a wiring harness connector and jointly power the load, and the main circuit of all battery packs is functioning normally (powering the load), the cover on the wiring harness connector is usually closed, with the first and second pins connected. If the user opens the cover at this time, the first and second pins will disconnect.

[0023] In this regard, please refer to Figure 2 The insertion / removal protection circuit provided in this application embodiment includes a host port 11 and at least one detection module 12, with each detection module 12 corresponding to at least one slave battery pack; wherein, the host port 11 can be located in the main battery pack, and this host port is used to provide a low-level signal. Figure 2 As shown, assume there are two main battery packs connected in series, one from battery pack A and the other from battery pack B, via corresponding wiring harness connectors. The detection module 12(a) of battery pack A is connected to the host port 11 via wiring harness connector a, which is equipped with a detection switch component a. The detection module 12(b) of battery pack B is connected to the detection module 12(a) via wiring harness connector b, which is equipped with a detection switch component b.

[0024] Specifically, each detection module 12 includes a first detection unit 121 and a second detection unit 122. The first end of the first detection unit 121 is connected to a power supply, its control end is connected to a first pin, and its output end is connected to a controller. The control end of the first detection unit also serves as a first communication end, used to connect to the host port of the front main battery pack via a wiring harness connector, or to connect to the second communication end of the front slave battery pack via a wiring harness connector. The first end of the second detection unit 122 is connected to a power supply, its control end is connected to a second pin, and its output end is connected to a controller. The control end of the second detection unit also serves as a second communication end, used to connect to the first communication end of the rear slave battery pack.

[0025] When the detection module 12 is the first slave battery pack, for example... Figure 2 The detection module (a) has a first detection unit 121(a) whose control terminal serves as a first communication terminal, used to connect to the host port 11 of the front main battery pack via a wiring harness connector a; and a second detection unit 122(a) whose control terminal serves as a second communication terminal, connected to the first communication terminal of the rear slave battery pack, i.e. Figure 2 The first communication terminal of the detection module (b) corresponding to battery pack B. When the detection module 12 is not the first slave battery pack, for example... Figure 2The detection module (b) of the battery pack B has its first detection unit 121 control terminal serving as the first communication terminal, which is used to connect to the corresponding second communication terminal of the preceding battery pack via the wiring harness connector b. Figure 2 The second communication terminal of the detection module (a) corresponding to battery pack A is connected to the first communication terminal of the battery pack, which is theoretically the first communication terminal of the detection module corresponding to battery pack C (not shown).

[0026] Specifically, the first detection unit 121 is used to output a first signal to the controller when no low-level signal is received, and to provide a low-level signal to the second detection unit when a low-level signal is received and the first pin and the second pin are connected. The second detection unit 122 is used to output a second signal to the controller when no low-level signal is received. The controller is used to control the main circuit of the current slave battery pack and all subsequent slave battery packs to disconnect when either the first signal or the second signal is received.

[0027] Based on this, when the controller receives the second signal but does not receive the first signal, it indicates that the first and second pins corresponding to the current slave battery pack are disconnected, meaning that the cover of the current slave battery pack has been opened by the user. At this time, the user may intend to disconnect the power line while it is powered on. Therefore, the controller immediately controls the disconnection of the main circuit of the current slave battery pack and all subsequent slave battery packs, triggering protective measures preventively before the user actually performs the action of hot-plugging, rather than performing remedial protection after the user's hot-plugging action. This completely avoids the leakage risk caused by hot-plugging and ensures the user's safety.

[0028] When the controller receives the first signal, it indicates that the current slave battery pack is not connected to the main battery pack or the previous slave battery pack through the wiring harness connector, that is, the current slave battery pack is not connected to the system where the main battery pack is located. Therefore, the controller will disconnect the main circuit of the current slave battery pack.

[0029] Furthermore, if the controller receives neither the first signal nor the second signal, it indicates that the current slave battery pack is connected to the previous slave battery pack or the main battery pack through the wiring harness connector (and thereby obtains a low level from the host port 11), and the corresponding first pin and second pin are connected (there is no cover opening action, thus it is determined that the user has no intention of unplugging the power line), then the controller opens the main circuit of the current slave battery pack.

[0030] Please combine Figure 3 In this embodiment of the application, a main battery pack and a slave battery pack are used as an example for illustration. This slave battery pack is... Figure 3 The diagram illustrates a battery pack 1, and the detection module 12 corresponding to the battery pack 1 includes a first detection unit and a second detection unit. For example... Figure 3As shown, this application embodiment provides a way for the host port 11 to provide a low-level signal, that is, to provide a low-level signal by grounding the resistor R0.

[0031] The first detection unit includes a first switching subunit, which includes resistors R1 and R2, a switching transistor Q1, a diode DS1, resistors R5 and R8, and resistor R6. Figure 3 As shown, the first terminal of the switching transistor Q1 is connected to the power supply VCC, that is... Figure 3 The diagram shows +5V; the second terminal of switching transistor Q1 is connected to the first terminal of resistor R5, the second terminal of resistor R5 is connected to the first terminal of resistor R8, the second terminal of resistor R8 is grounded (GND), and the first terminal of resistor R8 is connected to the controller (not shown) to provide the first signal $P_LOCK_S to the controller; the control terminal of switching transistor Q1 is connected to the power supply VCC through resistor R1, i.e. Figure 3 The +5V signal is shown in the diagram. The control terminal of the switching transistor Q1 is connected to the anode of the diode DS1 via resistor R2. The cathode of the diode DS1 is connected to the first pin 131 and the first end of resistor R6. The second end of resistor R6 serves as the first communication terminal. This first communication terminal is used to connect to the host port 11 when the wiring harness connector is connected to the main battery pack, i.e., at the P_LOCK+S signal in the diagram. A low level is provided to the first pin 131 via resistor R6.

[0032] It should be noted that, for non-first slave battery packs, its first communication terminal is used to connect with the second communication terminal of the previous slave battery pack when the wire harness connector is connected to the previous slave battery pack. For example, it supports connecting a slave battery pack 2 of slave battery pack 1 through the corresponding wire harness connector, and its first communication terminal is used to connect with the second communication terminal of slave battery pack 1 when the wire harness connector is connected to slave battery pack 1.

[0033] The second detection unit includes a second switching subunit, which includes resistors R3 and R4, a switching transistor Q2, a diode DS2, resistors R9, R12, and R10. For example... Figure 3 As shown, the first terminal of the switching transistor Q2 is connected to the power supply VCC, that is... Figure 3 The diagram shows +5V; the second terminal of switching transistor Q2 is connected to the first terminal of resistor R9, the second terminal of resistor R9 is connected to the first terminal of resistor R12, the second terminal of resistor R12 is grounded (GND), and the first terminal of resistor R12 is connected to the controller (not shown) to provide the second signal $N_LOCK_S to the controller; the control terminal of switching transistor Q2 is connected to the power supply VCC through resistor R3, i.e. Figure 3The +5V signal is shown in the diagram. The control terminal of the switching transistor Q2 is connected to the anode of diode DS2 via resistor R4. The cathode of diode DS2 is connected to the second pin 132 and the first terminal of resistor R10. The second terminal of resistor R10 serves as the second communication terminal, i.e., the N_LOCK+S signal in the diagram. When the first pin 131 and the second pin 132 are connected, the host port 11 pulls the level of the second pin 132 low through resistors R6 and R10. This second communication terminal is used to connect to the first communication terminal of the slave battery pack when a slave battery pack is connected via a wiring harness connector.

[0034] It should be noted that, for non-first slave battery packs, their first communication terminal is used to connect with the second communication terminal of the preceding slave battery pack when the wire harness connector is connected to it. For example, for a slave battery pack 2 that supports connection to slave battery pack 1 via a wire harness connector, its first communication terminal is used to connect with the second communication terminal of slave battery pack 1 when the wire harness connector is connected to slave battery pack 1.

[0035] Based on this, when the secondary battery pack 1 is connected to the main battery pack via the corresponding wiring harness connector and the cover is closed, the first pin 131 and the second pin 132 on the wiring harness connector corresponding to the secondary battery pack 1 are connected, and the host port 11 pulls down the level at the first pin 131 and the second pin 132 through resistor R6. Specifically, the voltage of the power supply VCC is divided by resistors R1 and R2, making the voltage difference across resistor R1 sufficient to control the switching transistor Q1 to conduct. Through the switching transistor Q1, the power supply VCC is divided by resistors R5 and R8, making the first end of resistor R8 provide a high level to the controller. Similarly, the voltage of the power supply VCC is divided by resistors R3 and R4, making the voltage difference across resistor R3 sufficient to control the switching transistor Q2 to conduct. Through the switching transistor Q2, the power supply VCC is divided by resistors R9 and R12, making the first end of resistor R9 provide a high level to the controller. Among them, diodes DS1 and DS2 can be low-voltage-drop Schottky diodes. Utilizing their low forward voltage drop and short reverse recovery time, they can reduce conduction losses and provide faster conduction speeds compared to ordinary diodes.

[0036] Please combine Figure 3 When the cover corresponding to battery pack 1 is opened, the first pin 131 and the second pin 132 are disconnected, and the second pin 132 is left floating. This prevents the control terminal voltage of switch Q2 from turning on switch Q2, thus causing switch Q2 to turn off. At this time, resistors R9 and R12 are grounded, pulling down the voltage at the first end of resistor R12. This causes the first end of resistor R12 to provide a low level to the controller. This low level is the second signal mentioned in this scheme, namely the low-level N_LOCK_S signal.

[0037] Therefore, if the controller detects the second signal (i.e., the $N_LOCK_S signal is low) and does not detect the first signal (i.e., the $P_LOCK_S signal is high), it means that although the slave battery pack 1 has been connected to the main battery pack through the wiring harness connector, its cover has been opened, causing the first pin and the second pin to be disconnected. The controller will determine that the user may have the intention to unplug the wiring harness connector while it is powered on, and then control the main circuit of the current slave battery pack 1 and all subsequent slave battery packs to be disconnected to protect the circuit safety and possible personnel safety.

[0038] Furthermore, if the slave battery pack 1 is not connected to the main battery pack through the corresponding wiring harness connector, its first communication terminal (i.e., P_LOCK+S) will not be connected to the host port 11. In this case, even if the first pin 131 is connected to the second pin 132 (i.e., the cover is closed), the switching transistors Q1 and Q2 will not be turned on. Therefore, both the P_LOCK_S signal and the N_LOCK_S signal will be at a low level. That is, the controller will detect the first signal and the second signal at the same time, and the controller will also control the main circuit of the slave battery pack 1 to be disconnected.

[0039] In some embodiments, please combine Figure 3 The first detection unit further includes a first filtering subunit, which includes a resistor R7 and a capacitor C1. Specifically, the first end of resistor R8 is connected to the controller through resistor R7, the first end of capacitor C2 is connected to the controller, and the second end of capacitor C2 is connected to the second end of resistor R8. Similarly, in some embodiments, the second detection unit further includes a second filtering subunit, which includes a resistor R11 and a capacitor C2. Specifically, the first end of resistor R12 is connected to the controller through resistor R11, the first end of capacitor C2 is connected to the controller, and the second end of capacitor C2 is connected to the second end of resistor R12. This solution's filtering section can filter out noise and spurious signals generated during the switching process of switching transistor Q1 and / or switching transistor Q2, making the signal transmitted to the controller relatively stable, thereby improving the accuracy of the controller's signal response and reducing controller malfunctions.

[0040] Please combine Figure 3In some embodiments, the first detection unit further includes a first clamping subunit, wherein the first clamping subunit includes Schottky diodes D1 and D2. Specifically, the cathode of Schottky diode D1 is connected to the reference power supply +3V3, the anode of Schottky diode D1 is connected to the first terminal of resistor R8, the cathode of Schottky diode D2 is connected to the anode of Schottky diode D1, and the anode of Schottky diode D2 is grounded to GND. Similarly, in some embodiments, the second detection unit further includes a second clamping subunit, wherein the second clamping subunit includes Schottky diodes D3 and D4. Specifically, the cathode of Schottky diode D3 is connected to the reference power supply +3V3, the anode of Schottky diode D4 is connected to the first terminal of resistor R12, the cathode of Schottky diode D4 is connected to the anode of Schottky diode D3, and the anode of Schottky diode D4 is grounded to GND.

[0041] Based on this, the first clamping subunit is used to limit the voltage output by the first switching subunit within a preset range. In this embodiment, the reference voltage is 3.3V, and the corresponding preset range is specifically 0-3.3V. When the switching transistor Q1 is turned on, the power supply VCC is divided by resistors R5 and R8, and a high level is provided to the controller through the first terminal of resistor R8. If the voltage of this high-level electrical signal is between 0-3.3V, then both Schottky diodes D1 and D2 are not turned on. If the voltage of this high-level signal is greater than 3.3V (for example, it may be affected by other nearby devices causing voltage fluctuations to be greater than 3.3V), then Schottky diode D1 is turned on, clamping its voltage at 3.3V. When the switching transistor Q1 is turned off, the first terminal of resistor R8 provides a low level (first signal) to the controller based on GND. Similarly, if there is some interference that causes the voltage of this low level to be lower than GND, Schottky diode D2 will also clamp it in reverse at the GND voltage. It is understandable that the second clamping subunit is used to limit the voltage output by the second switching subunit within a preset range, and its principle is similar to that of the first clamping subunit mentioned above, so it will not be described again here.

[0042] In some embodiments, please combine Figure 4 The detection switch assembly of the wire harness connector also includes a spring element disposed between the cover plate and the first pin (i.e. Figure 4 The pin corresponding to the REGA+ signal) and the second pin (i.e. Figure 4 The elastic element is used to contact the first and second pins when the cover is closed, so that the first pin is connected to the second pin, thereby achieving the effect of controlling the connection state of the first and second pins by utilizing the opening and closing state of the cover.

[0043] To illustrate this, taking the main battery pack and slave battery pack 1 as an example, assuming the main battery pack and slave battery pack 1 are connected via a wiring harness connector, the cover is closed, and they are jointly supplying power to the load, the elastic element of the wiring harness connector, under the pressure of the cover, connects the first and second pins. The connected detection module provides a high-level signal to the controller. In this situation, if the user is unaware of the power supply and attempts to open the cover to directly unplug the wiring harness connector, the elastic element will spring back when the cover is opened, disconnecting the first and second pins. The connected detection module then provides a low-level signal (the second signal) to the controller, causing the controller to respond to this second signal and disconnect the main circuit of slave battery pack 1, preventing circuit leakage that could damage devices or cause injury.

[0044] This application provides a plug-in protection circuit for a battery pack parallel operation system. The system includes a main battery pack and at least one slave battery pack connected sequentially via a wiring harness connector. The wiring harness connector is equipped with a detection switch assembly capable of controlling the connection / disconnection of a first pin and a second pin through the opening and closing of a cover. Based on this, the plug-in protection circuit includes a host port and a detection module corresponding to the slave battery pack. The detection module includes a first detection unit and a second detection unit. The first detection unit outputs a first signal to the controller when no low-level signal is received, and provides a low-level signal to the second detection unit when a low-level signal is received and the first pin and the second pin are connected. The second detection unit outputs a second signal to the controller when no low-level signal is received. The controller controls the main circuit of the current slave battery pack and all subsequent slave battery packs to disconnect upon receiving either the first or second signal. When the user lifts the cover, the first pin and the second pin immediately disconnect, triggering the second detection unit of the corresponding detection module to send a second signal to the controller. The controller simultaneously cuts off the main circuit of the current battery pack and all subsequent slave devices, eliminating the risk of arcing caused by hot plugging and unplugging in advance. It can also distinguish between two states: the battery pack not connected to the system and the user lifting the cover, based on whether the first detection unit obtains the low-level signal from the front stage. It also achieves the step-by-step transmission of the low-level signal between the master and slave devices through cascaded communication, ensuring the preventive power-off when the cover is lifted, rather than performing post-event protection after the user unplugs the cover while it is powered on, thus completely avoiding the risk of short circuits and leakage in high-current scenarios.

[0045] This application provides an electronic device that includes the insertion / removal protection circuit described in the above embodiments. Based on this, the electronic device possesses the technical features and beneficial effects of the aforementioned insertion / removal protection circuit. Technical details not described in the electronic device embodiments can be found in the above-described insertion / removal protection circuit embodiments.

[0046] The device or equipment embodiments described above are merely illustrative. The unit modules described as separate components may or may not be physically separate. The components shown as module units may or may not be physical units; that is, they may be located in one place or distributed across multiple network module units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them; under the concept of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of this application as described above, which are not provided in detail for the sake of brevity; although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A plug-in / plug-out protection circuit, applied to a battery pack parallel operation system, the battery pack parallel operation system comprising a master battery pack and at least one slave battery pack connected in series, wherein each slave battery pack is sequentially connected to the previous battery pack through a corresponding wiring harness connector, characterized in that, The insertion and removal protection circuit includes a host port and at least one detection module, wherein the at least one detection module corresponds one-to-one with the at least one slave battery pack; The main battery pack is provided with a host port, which is used to provide a low-level signal; the wiring harness connector is provided with a detection switch assembly, which includes a cover plate, a first pin and a second pin, wherein the first pin and the second pin are connected when the cover plate is closed, and disconnected when the cover plate is opened; The detection module includes a first detection unit and a second detection unit. The first end of the first detection unit is connected to a power supply, the control end of the first detection unit is connected to the first pin, and the output end of the first detection unit is connected to a controller. The control end of the first detection unit also serves as a first communication end, used to connect to the host port of the main battery pack via a wiring harness connector, or to connect to the second communication end corresponding to the front-end slave battery pack via a wiring harness connector. The first end of the second detection unit is connected to a power supply, the control end of the second detection unit is connected to the second pin, and the output end of the second detection unit is connected to the controller. The control end of the second detection unit also serves as a second communication end, used to connect to the first communication end corresponding to the rear-end slave battery pack. The first detection unit is configured to output a first signal to the controller when no low-level signal is received, and to provide the low-level signal to the second detection unit when the low-level signal is received and the first pin is connected to the second pin. The second detection unit is used to output a second signal to the controller when the low-level signal is not received; The controller is used to disconnect the main circuit of the current battery pack and all subsequent battery packs when it receives the first signal or the second signal.

2. The plug protection circuit of claim 1, wherein, The detection switch assembly further includes an elastic element disposed between the cover plate and the first pin and the second pin. The elastic element is used to contact the first pin and the second pin when the cover plate is closed, so that the first pin and the second pin are connected.

3. The plug protection circuit of claim 1, wherein, The first detection unit includes a first switch subunit, which includes resistors R1 and R2, a switch transistor Q1, a diode DS1, resistors R5 and R8, and resistor R6. The first terminal of the switching transistor Q1 is connected to the power supply; the second terminal of the switching transistor Q1 is connected to the first terminal of the resistor R5, the second terminal of the resistor R5 is connected to the first terminal of the resistor R8, the second terminal of the resistor R8 is grounded, and the first terminal of the resistor R8 is connected to the controller; the control terminal of the switching transistor Q1 is connected to the power supply through the resistor R1, the control terminal of the switching transistor Q1 is connected to the anode of the diode DS1 through the resistor R2, the cathode of the diode DS1 is connected to the first pin, the cathode of the diode DS1 is connected to the first terminal of the resistor R6, and the second terminal of the resistor R6 serves as the first communication terminal.

4. The plug protection circuit of claim 3, wherein, The first detection unit further includes a first filtering subunit, which includes a resistor R7 and a capacitor C1. The first end of the resistor R8 is connected to the controller through the resistor R7, the first end of the capacitor C1 is connected to the controller, and the second end of the capacitor C1 is connected to the second end of the resistor R8.

5. The plug protection circuit of claim 3, wherein, The first detection unit further includes a first clamping subunit, which includes a Schottky diode D1 and a Schottky diode D2. The cathode of the Schottky diode D1 is connected to a reference power supply, the anode of the Schottky diode D1 is connected to the first terminal of the resistor R8, the cathode of the Schottky diode D2 is connected to the anode of the Schottky diode D1, and the anode of the Schottky diode D2 is grounded. The first clamping subunit is used to limit the voltage output by the first detection unit within a preset range.

6. The plug protection circuit of claim 1, wherein, The second detection unit includes a second switch subunit, which includes resistors R3 and R4, a switch Q2, a diode DS2, resistors R9 and R12, and resistor R10. The first terminal of the switching transistor Q2 is connected to the power supply; the second terminal of the switching transistor Q2 is connected to the first terminal of the resistor R9, the second terminal of the resistor R9 is connected to the first terminal of the resistor R12, the second terminal of the resistor R12 is grounded, and the first terminal of the resistor R12 is connected to the controller; the control terminal of the switching transistor Q2 is connected to the power supply through the resistor R3, and the control terminal of the switching transistor Q2 is connected to the anode of the diode DS2 through the resistor R4; the cathode of the diode DS2 is connected to the second pin, the cathode of the diode DS2 is connected to the first terminal of the resistor R10, and the second terminal of the resistor R10 serves as the second communication terminal.

7. The plug protection circuit of claim 6, wherein, The second detection unit further includes a second filtering subunit, which includes a resistor R11 and a capacitor C2. The first end of the resistor R12 is connected to the controller through the resistor R11, the first end of the capacitor C2 is connected to the controller, and the second end of the capacitor C2 is connected to the second end of the resistor R12.

8. The plug protection circuit of claim 6, wherein, The second detection unit further includes a second clamping subunit, which includes a Schottky diode D3 and a Schottky diode D4. The cathode of the Schottky diode D3 is connected to a reference power supply, the anode of the Schottky diode D4 is connected to the first terminal of the resistor R12, the cathode of the Schottky diode D4 is connected to the anode of the Schottky diode D3, and the anode of the Schottky diode D4 is grounded. The second clamping subunit is used to limit the voltage output by the second detection unit within a preset range.

9. The plug protection circuit of claim 1, wherein, The host port is grounded through resistor R0.

10. An electronic device, characterized in that, Includes the insertion / removal protection circuit as described in any one of claims 1-9.

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