Impact detection circuit and protection plate

Abstract

The utility model is suitable for the technical field of protection plates, and provides an impact detection circuit and a protection plate. The impact detection circuit comprises an impact detection unit and a logic control unit, the impact detection unit is arranged on the protection plate, and the impact detection unit is electrically connected with the logic control unit. When the impact energy borne by the protection plate is larger than or equal to the preset impact energy, the protection plate can deform within the local impact range, and the deformation quantity reaches the preset deformation quantity. The impact detection unit is changed from the first state to the second state, and the logic control unit outputs a logic alarm signal when the impact detection unit is in the second state to warn a system monitoring center so as to timely process the protection plate. According to the impact detection circuit provided by the embodiment of the invention, the impact condition of the protection plate is monitored in real time only by using a simple circuit, and expensive detection elements or sensors do not need to be adopted, so that the cost of impact damage detection can be remarkably reduced.

Description

Technical Field

[0001] This application belongs to the technical field of protective plates, and particularly relates to an impact detection circuit and a protective plate. Background Art

[0002] The battery pack of a new energy vehicle, as a core power component, has the risk of catching fire or exploding due to potential hazards such as extrusion, collision, and puncture. The protective plate of the battery pack is designed to provide effective protection, but it is prone to dent and deformation after being impacted by high-energy foreign objects. Since the battery pack protective plate is usually located on the vehicle chassis, it is difficult for the vehicle owner to visually inspect its condition. This results in the "injured" protective plate not only having a greatly reduced protection effect but also potentially bringing the risk of uneliminated battery failure. Therefore, the problem of real-time monitoring of whether the battery pack protective plate has been impacted is particularly urgent. Currently, the impact detection circuit for the battery pack protective plate usually uses expensive detection components and sensors, and the price of some precision components may even exceed the overall cost of the low-cost protective plate, resulting in a relatively high detection cost for the impact detection circuit. Utility Model Content

[0003] The embodiments of this application provide an impact detection circuit and a protective plate, which can solve the problem of relatively high detection cost of the existing impact detection circuit.

[0004] In a first aspect, the embodiments of this application provide an impact detection circuit applied to a protective plate, including an impact detection unit and a logic control unit. The impact detection unit is arranged on the protective plate, and the impact detection unit is electrically connected to the logic control unit;

[0005] When the impact energy received by the protective plate is greater than or equal to a preset impact energy, the impact detection unit changes from a first state to a second state, and the logic control unit is configured to output a logic alarm signal when the impact detection unit is in the second state.

[0006] In a possible implementation manner of the first aspect, the impact detection unit includes a first wire, and the first wire is distributed on the protective plate, and both ends of the first wire are electrically connected to the logic control unit respectively.

[0007] In a possible implementation manner of the first aspect, the first wire is distributed on the protective plate in an "S"-shaped ring structure arrangement, a straight parallel arrangement, or a horizontal and vertical grid arrangement.

[0008] In a possible implementation manner of the first aspect, the first wire and the protective plate are insulated by an insulating material, and the insulating material is a film or an insulating layer on the outer wall of the first wire.

[0009] In a possible implementation of the first aspect, the first wire is at least one of a metal etched wire, an enameled wire, and a carbon fiber wire.

[0010] In a possible implementation of the first aspect, the impact detection unit further includes a first resistor. The first end of the first resistor is electrically connected to any end of the first wire, and the second end of the first resistor is electrically connected to the logic control unit.

[0011] In a possible implementation of the first aspect, the logic control unit includes a second resistor and a first triode. The first end of the second resistor is used to be electrically connected to a first power supply. The second end of the second resistor is respectively electrically connected to the base of the first triode and the first end of the impact detection unit. The collector of the first triode is used to be electrically connected to a second power supply. The emitter of the first triode is respectively electrically connected to the second end of the impact detection unit and the ground.

[0012] In a possible implementation of the first aspect, the impact detection circuit further includes a filtering unit. The first end of the filtering unit is respectively electrically connected to the second power supply and the logic control unit. The second end of the filtering unit is grounded. The filtering unit is used to filter out high-frequency signals in the supply voltage output by the second power supply.

[0013] In a second aspect, an embodiment of the present application provides a protective plate, including a protective plate body and at least one impact detection circuit according to any one of the first aspect. The protective plate body includes a first protective layer, an impact-resistant layer, a buffer layer, and a second protective layer. The buffer layer is disposed on the second protective layer. The impact-resistant layer is disposed on the buffer layer. The first protective layer is disposed on the impact-resistant layer. The impact detection circuit is disposed between the first protective layer and the impact-resistant layer, or the impact detection circuit is disposed between the impact-resistant layer and the buffer layer, or the impact detection circuit is disposed between the buffer layer and the second protective layer.

[0014] In a possible implementation of the second aspect, the buffer layer is a buffer layer made of aluminum, stainless steel, or polypropylene.

[0015] The beneficial effects of the embodiments of the present application compared with the prior art are:

[0016] The impact detection circuit provided by the embodiment of the present application includes an impact detection unit and a logic control unit, and the impact detection unit is electrically connected to the logic control unit. When the impact energy received by the protection plate is greater than or equal to the preset impact energy, it indicates that the impact force on the protection plate is relatively large. At this time, the protection plate will deform within the locally impacted area, and the amount of deformation reaches the preset amount of deformation. At this time, the impact detection unit changes from the first state to the second state, where the first state can be the conducting state of the impact detection unit, and the second state can be the disconnected state of the impact detection unit. The logic control unit outputs a logic alarm signal when the impact detection unit is in the second state to alert the system monitoring center for timely processing of the protection plate. It can be seen that the impact detection circuit provided by the embodiment of the present application only uses a simple circuit to monitor the impact situation of the protection plate in real time. There is no need to use expensive detection components or sensors, which can significantly reduce the cost of impact damage detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 is the principle block diagram of the impact detection circuit provided by an embodiment of the present application;

[0019] Figure 2 is the principle block diagram of the impact detection circuit provided by another embodiment of the present application;

[0020] Figure 3 is the principle block diagram of the impact detection circuit provided by another embodiment of the present application;

[0021] Figure 4 is the principle block diagram of the impact detection circuit provided by another embodiment of the present application;

[0022] Figure 5 is the principle block diagram of the impact detection circuit provided by another embodiment of the present application;

[0023] Figure 6 is the circuit connection schematic diagram of the impact detection circuit provided by an embodiment of the present application;

[0024] Figure 7 is the schematic diagram of the specific implementation circuit of the impact detection provided by an embodiment of the present application;

[0025] Figure 8 is the schematic diagram of the specific implementation circuit of the impact detection provided by another embodiment of the present application;

[0026] Figure 9 It is a schematic structural diagram of a protective plate provided by an embodiment of the present application.

[0027] In the figure, 10 is an impact detection circuit; 101 is an impact detection unit; 102 is a logic control unit; 103 is a filtering unit; 20 is a protective plate; 201 is a first protective layer; 202 is an impact-resistant layer; 203 is a buffer layer; 204 is a second protective layer. Detailed implementation manners

[0028] In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present application. However, those skilled in the art should clearly understand that the present application can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present application.

[0029] It should be understood that when used in the specification of the present application and the appended claims, the term "comprising" indicates the presence of the described features, wholes, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0030] It should also be understood that the term "and / or" used in the specification of the present application and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0031] As used in the specification of the present application and the appended claims, the term "if" can be interpreted as "when", "once", "in response to determining", or "in response to detecting" according to the context. Similarly, the phrase "if determined" or "if [the described condition or event] is detected" can be interpreted as meaning "once determined", "in response to determining", "once [the described condition or event] is detected", or "in response to detecting [the described condition or event]" according to the context.

[0032] In addition, in the description of the specification of the present application and the appended claims, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0033] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that a particular feature, structure, or characteristic described in connection with that embodiment is included in one or more embodiments of this application. Thus, statements such as "in one embodiment", "in some embodiments", "in other some embodiments", "in still other embodiments", etc. that appear in different places in this specification do not necessarily all refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized. The terms "comprising", "including", "having" and their variants all mean "including but not limited to", unless otherwise specifically emphasized.

[0034] As a core power component, the battery pack of a new energy vehicle has the risk of catching fire or exploding due to potential hazards such as extrusion, collision, and puncture. The protective plate of the battery pack is designed to provide effective protection, but it is prone to dent and deformation after being impacted by high-energy foreign objects. Since the protective plate of the battery pack is usually located at the vehicle chassis, it is difficult for the vehicle owner to visually inspect its condition. This results in the "injured" protective plate not only having its protective effect greatly reduced but also possibly bringing the risk of uneliminated battery failure. Therefore, the problem of real-time monitoring whether the protective plate of the battery pack has been impacted is particularly urgent. Currently, the impact detection circuit for the battery pack protective plate usually uses expensive detection components and sensors, and the price of some precision components may even exceed the overall cost of the low-cost protective plate, resulting in a relatively high detection cost for the impact detection circuit.

[0035] Based on the above problems, the impact detection circuit provided in the embodiments of this application includes an impact detection unit and a logic control unit. The impact detection unit is arranged on the protective plate, and the impact detection unit is electrically connected to the logic control unit. When the impact energy received by the protective plate is greater than or equal to the preset impact energy, it indicates that the impact force on the protective plate is relatively large. At this time, the local area of the protective plate where the impact occurs will deform, and the amount of deformation reaches the preset amount of deformation. At this time, the impact detection unit changes from the first state to the second state. Among them, the first state can be the conducting state of the impact detection unit, and the second state can be the disconnected state of the impact detection unit. The logic control unit outputs a logic alarm signal when the impact detection unit is in the second state to alert the system monitoring center for timely processing of the protective plate. It can be seen that the impact detection circuit provided in the embodiments of this application only uses a simple circuit to real-time monitor the situation of the protective plate being impacted. There is no need to use expensive detection components or sensors, which can significantly reduce the cost of impact damage detection.

[0036] In order to illustrate the technical solutions described in this application, the following will be described through specific embodiments.

[0037] Figure 1The principle block diagram of the impact detection circuit 10 provided by an embodiment of the present application is shown. Refer to Figure 1 As shown, the impact detection circuit 10 includes an impact detection unit 101 and a logic control unit 102, and the impact detection unit 101 is electrically connected to the logic control unit 102.

[0038] Specifically, when the impact energy received by the protection plate 20 is greater than or equal to the preset impact energy, it indicates that the impact force received by the protection plate 20 is relatively large. At this time, the protection plate 20 will deform in the locally impacted area, and the amount of deformation reaches the preset amount of deformation. At this time, the impact detection unit 101 changes from the first state to the second state. Among them, the first state can be the conducting state of the impact detection unit 101, and the second state can be the disconnected state of the impact detection unit 101. The logic control unit 102 outputs a logic alarm signal when the impact detection unit 101 is in the second state to alert the system monitoring center for timely processing of the protection plate 20. It can be seen from this that the impact detection circuit 10 provided by the embodiment of the present application only uses a simple circuit to monitor the impact situation of the protection plate 20 in real time. There is no need to use expensive detection components or sensors, which can significantly reduce the cost of impact damage detection.

[0039] It should be noted that the logic control unit 102 is also used to output a second logic signal when the impact detection unit 101 is in the first state, and the logic control unit 102 does not output an alarm signal according to the second logic signal. Among them, the logic alarm signal can be a low-level signal, and the second logic signal can be a floating signal.

[0040] It should be noted that the logic control unit 102 can be arranged at the edge or outside of the protection plate 20, that is, the logic control unit 102 can output a logic alarm signal when the impact detection unit 101 is in the second state, and there is no need to limit the specific position of the logic control unit 102. Specifically, the control circuit is similar to a PCB circuit board and will eventually be encapsulated in a box. To provide additional protection and buffering, the protection plate 20 usually includes a buffer layer made of aluminum honeycomb material with a thickness of 5 mm. This design not only reduces the overall weight but also provides good impact absorption performance. In actual application, a small piece can be cut off at the edge of the buffer honeycomb layer of the protection plate 20, creating some space inside the protection plate 20 sufficient to place the logic control unit 102. This method ensures that all lines are inside the protection plate 20, providing better protection and concealment. The entire box can also be placed outside the protection plate 20, and the lines can be led from inside the protection plate 20 to the outside. This design can provide more flexibility, making the line layout and maintenance more convenient. The box can be designed to fit tightly with the protection plate 20 to ensure the firmness and stability of the overall structure.

[0041] It should be noted that the preset impact energy is the lowest threshold for detecting the impact energy. When the impact energy received by the protection plate 20 is greater than or equal to the lowest threshold, the impact detection unit 101 will change from the first state to the second state.

[0042] Exemplarily, the preset impact energy can be adjusted and set according to the actual situation. For example, the preset impact energy can be set to 100 J, and the impact energy range that the impact detection circuit 10 can monitor can be set to 100 J to 1000 J. The preset impact energy can also be adjusted according to the type of the protection plate. The specific value of the preset impact energy is not limited herein.

[0043] In an embodiment of the present application, as Figure 2 shown, the impact detection unit 101 includes a first wire, and the first wire is distributed on the protection plate 20, and both ends of the first wire are electrically connected to the logic control unit 102 respectively.

[0044] Specifically, when the impact energy received by the protection plate 20 is greater than or equal to the preset impact energy, the first wire will be disconnected, so that the logic control unit 102 outputs a logic alarm signal.

[0045] In an embodiment of the present application, the first wire is distributed on the protection plate 20 in an "S"-shaped ring structure arrangement, a straight side-by-side arrangement, or a horizontal and vertical grid arrangement.

[0046] Specifically, the first wire can cover the entire protection plate 20 in the above arrangement manner, increasing the impact response range of the protection plate 20.

[0047] It should be noted that the arrangement manner of the wire can also be set accordingly according to the position where the protection plate 20 is easily impacted. For example, the wire on the protection plate 20 near the vehicle head direction can be designed to be denser. For example, the wire spacing can be set to 2 mm to improve the accuracy of impact detection. All the above wire arrangement manners can cover the entire surface of the protection plate 20, making the effective response range of the impact detection circuit 10 larger. The spacing of the above wires needs to be controlled between 3 mm and 50 mm. If wires obtained through an etching process are used, smaller and more uniform spacings can be set, and at the same time, the process requirements for wire arrangement are eliminated. The preset impact energy can be adjusted by changing the type of wire material (such as enameled aluminum wire, enameled copper wire, carbon fiber, etc.), the shape of the wire (such as cylindrical, flat), the diameter of the wire (0.2 mm to 1.0 mm), or the structure of the wire (whether it includes an insulating layer), etc., which is applicable to various types of protection plates 20, with high reliability and strong adaptability.

[0048] In an embodiment of the present application, an insulating material is used for insulation between the first wire and the protection plate 20, and the insulating material is a film or an insulating layer on the outer wall of the first wire.

[0049] Specifically, the insulating material can prevent current leakage, reduce the risks of electric shock and fire, and protect the safety of personnel and property. At the same time, the insulating material can prevent accidental contact between wires or between a wire and other conductors, thereby preventing the occurrence of short circuits. The first wire used in this application can be a metal wire with a certain bending flexibility, such as an enameled wire - oxygen-free copper wire coated with polyimide insulation, or a conductive non-metal wire with an insulating layer, such as carbon fiber. That is, the first wire can be at least one of a metal etched wire, an enameled wire, and a carbon fiber wire.

[0050] In an embodiment of this application, as Figure 3 shown, the impact detection unit 101 further includes a first resistor R1. The first end of the first resistor R1 is electrically connected to any end of the first wire, and the second end of the first resistor R1 is electrically connected to the logic control unit 102.

[0051] Specifically, the first resistor R1 serves as a current-limiting protection resistor to protect the wire and the logic control unit 102 from being damaged by overcurrent. When the protective plate 20 is impacted and the wire is disconnected, the resistance in the circuit will increase, resulting in a sharp drop in current. Without the first resistor R1, due to the disconnection of the wire, the current received by the logic control unit 102 may suddenly increase, which may damage the logic control unit 102 or cause it to malfunction.

[0052] It should be noted that the first resistor R1 needs to be set with a specific resistance value. If the resistance value is too small, local heating is likely to occur, resulting in unnecessary energy loss. If the wire itself has a high resistance value, the first resistor R1 can be omitted. The resistance value range of the resistor R1 can be [1 kΩ, 100 kΩ], and its function is to ensure that the voltage of the impact detection circuit 10 that realizes the detection function has distinguishability in the first and second states.

[0053] It should be noted that Figure 2 and Figure 3 the first wire in the impact detection unit 101 shown is arranged horizontally, and the number of the first resistors R1 is the same as the number of the wires. Figure 4 shows that the first wire in the impact detection unit 101 is arranged in an "S"-shaped loop, and only one first resistor R1 needs to be connected in series. The spacing between the horizontal straight wires can be set to 8 mm to 15 mm. Figure 5 shows that the wires in the impact detection unit 101 are arranged in a matrix pattern. Four wires arranged in an "S"-shaped loop are used, and four first resistors R1 need to be connected in series. The number of matrices can be flexibly increased or decreased according to the size of the protective plate 20 and the detection accuracy requirements. The position information of the impact on the protective plate 20 can be obtained through the electrical signal feedback of each detection matrix.

[0054] Exemplarily, as Figure 3 shown, three first wires arranged horizontally are distributed on the protection plate 20. If the first first wire is broken, the logic control unit 102 connected to the first first wire will output a logic alarm signal. After receiving the logic alarm signal, the driver or the system monitoring center can obtain the position information of the first first wire on the protection plate 20 and check and process this position in a timely manner. As Figure 5 shown, four first wires arranged in a matrix are distributed on the protection plate 20. If the fourth first wire is broken, the logic control unit 102 connected to the fourth first wire will output a logic alarm signal. After receiving the logic alarm signal, the driver or the system monitoring center can obtain the position information of the fourth first wire on the protection plate 20 and check and process this position in a timely manner. It can be seen from this that when the first wires are arranged on the protection plate 20 in a horizontal arrangement or a matrix arrangement, a corresponding number of impact detection circuits 10 can be set to obtain the position information of the impact damage on the protection plate 20.

[0055] It should be noted that if the wires cover the surface of the protection plate 20 in a horizontal or matrix manner, a corresponding number of logic control units 102 can be set to determine the position information of the impact on the protection plate 20. In order to obtain the position information of the impact on the protection plate 20, a PLC controller with multiple IO ports can also be set to analyze multiple input signals and output corresponding control signals.

[0056] In an embodiment of the present application, as Figure 6 shown, the logic control unit 102 includes a second resistor R2 and a first triode Q1. The first end of the second resistor R2 is used to be electrically connected to the first power supply VCC1, the second end of the second resistor R2 is respectively electrically connected to the base of the first triode Q1 and the first end of the impact detection unit 101, the collector of the first triode Q1 is used to be electrically connected to the second power supply VCC2, and the emitter of the first triode Q1 is respectively electrically connected to the impact detection unit 101 and the ground.

[0057] Specifically, the second resistor R2 is connected to the base of the first triode Q1, which plays a current-limiting role to prevent excessive current flowing into the base of the first triode Q1 and damaging the first triode Q1, while ensuring that the current at the base of the first triode Q1 is within a safe range. The first triode Q1 acts as a switching device and plays a switching role. When the first wire in the impact detection unit 101 is not disconnected, the first power supply VCC1, the second resistor R2, and the wire form a loop, pulling down the voltage at the base of the first triode Q1. No current flows into the base of the first triode Q1, and the first triode Q1 is in the cut-off state. The second power supply VCC2, the first triode Q1, and the ground cannot form a closed loop, and the logic control unit 102 will not output a logic alarm signal. When the first wire in the impact detection unit 101 is disconnected, the voltage at the base of the first triode Q1 is pulled up, and a large amount of current flows into the base of the first triode Q1. The first triode Q1 is in the saturation state, and the second power supply VCC2, the first triode Q1, and the ground can form a closed loop, and the logic control unit 102 outputs a logic alarm signal.

[0058] It should be noted that the first power supply VCC1 and the second power supply VCC2 can be the same or different, and are not limited herein.

[0059] In an embodiment of the present application, as Figure 6 shown, the logic control unit 102 further includes an alarm. The first end of the alarm is electrically connected to the second power supply VCC2, and the second end of the alarm is electrically connected to the collector of the first triode Q1.

[0060] Specifically, the alarm is used to output an alarm signal according to the logic alarm signal output by the logic control unit. Among them, the alarm can include a light-emitting diode LED and / or a buzzer B1. The first end of the buzzer B1 and the anode of the light-emitting diode LED are both electrically connected to the second power supply VCC2, and the second end of the buzzer B1 and the cathode of the light-emitting diode LED are both electrically connected to the collector of the first triode Q1.

[0061] Specifically, both the light-emitting diode LED and the buzzer B1 are arranged between the second power supply VCC2 and the collector of the first triode Q1. When the first triode Q1 is in the saturation state, the second power supply VCC2, the light-emitting diode LED / buzzer B1, the first triode Q1, and the ground form a loop, and the light-emitting diode LED is powered on and emits light, and the buzzer B1 is powered on and sounds. By outputting an alarm signal (lighting and sounding) to warn the system monitoring center for timely processing of the protection board 20.

[0062] In an embodiment of the present application, as Figure 6As shown, the logic control unit 102 further includes a third resistor R3. The first end of the third resistor R3 is electrically connected to the cathode of the light-emitting diode LED, and the second end of the third resistor R3 is electrically connected to the collector of the first triode Q1.

[0063] Specifically, the third resistor R3 is connected to the cathode of the light-emitting diode LED, which plays a current-limiting role to control the current flowing into the light-emitting diode LED, so as to protect the light-emitting diode LED and reduce the power consumption of the logic control unit 102.

[0064] In an embodiment of the present application, as Figure 6 shown, the logic control unit 102 further includes a first diode U1. The anode of the first diode U1 is electrically connected to the second end of the buzzer B1 and the logic control unit 102 respectively, and the cathode of the first diode U1 is electrically connected to the first end of the buzzer B1.

[0065] Specifically, the first diode U1 is connected in parallel with the buzzer B1 and can act as a freewheeling diode, which can provide a low-impedance path when the buzzer B1 is powered off, thereby helping to release the back electromotive force and preventing the buzzer B1 from being affected by the induced electromotive force, improving the reliability of the logic control unit 102.

[0066] In an embodiment of the present application, as Figure 6 shown, the impact detection circuit 10 further includes a filtering unit 104. The first end of the filtering unit 104 is electrically connected to the second power supply VCC2 and the logic control unit 102 respectively, and the second end of the filtering unit 104 is grounded.

[0067] Specifically, there may be a spike voltage in the supply voltage output by the second power supply VCC2. The filtering unit 104 can filter out the high-frequency signals in the supply voltage and prevent the high-frequency signals in the supply voltage from interfering with the normal operation of the logic control unit 102.

[0068] In an embodiment of the present application, as Figure 6 shown, the filtering unit 104 includes a first capacitor C1. The first end of the first capacitor C1 is electrically connected to the power supply VCC and the logic control unit 102 respectively, and the second end of the first capacitor C1 is grounded.

[0069] Specifically, the first capacitor C1 has the function of passing high-frequency signals and blocking low-frequency signals, which can filter out the high-frequency signals in the supply voltage and prevent the high-frequency signals in the supply voltage from interfering with the normal operation of the logic control unit 102.

[0070] In an embodiment of the present application, as Figure 7 and Figure 8As shown, it is also possible to determine whether the protection plate 20 has been impacted and the degree of impact by detecting the total voltage of the first resistor R1 and the wire. When the wire is not disconnected, the total voltage of the first resistor R1 and the wire is relatively low; when the impact energy received by the protection plate 20 is greater than or equal to the preset impact energy, causing the wire to disconnect, the voltage across the first resistor R1 and the wire will change significantly. Therefore, an appropriate alarm signal can be output according to the change in voltage to alert the system monitoring center, so as to process the protection plate 20 in a timely manner.

[0071] It should be noted that when the impact energy received by the protection plate 20 is less than the preset impact energy, causing the wire not to disconnect, the total voltage of the first resistor R1 and the wire will change slightly (increase or decrease), and the logic control unit 102 is not turned on. At this time, the logic control unit 102 does not output a warning signal.

[0072] Exemplarily, Figure 8 the resistance value of the first resistor R1 in can be set to 1200 Ω, the distance between the wires can be set to 8 mm, and the battery is 12V.

[0073] This application also discloses a protection plate 20, as Figure 9 shown. The protection plate 20 includes a protection plate body and at least one of the above-mentioned impact detection circuits 10. The protection plate body includes a first protection layer 201, an impact-resistant layer 202, a buffer layer 203, and a second protection layer 204. The buffer layer 203 is disposed on the second protection layer 204, the impact-resistant layer 202 is disposed on the buffer layer 203, the first protection layer 201 is disposed on the impact-resistant layer 202, and the impact detection circuit 10 is disposed between the first protection layer 201 and the impact-resistant layer 202, or the impact detection circuit 10 is disposed between the impact-resistant layer 202 and the buffer layer 203, or the impact detection circuit 10 is disposed between the buffer layer 203 and the second protection layer 204. The impact detection units 101 in all the impact detection circuits 10 are distributed on the protection plate body, and the logic control units 102 in all the impact detection circuits 10 are disposed outside the protection plate body.

[0074] Specifically, Figure 9 the impacted surface shown in is the side of the protection plate that receives the impact energy. Both the first protection layer 201 and the second protection layer 204 provide preliminary protection to prevent external objects from directly contacting the internal sensitive components, and can also reduce the force when the protection plate is impacted. The impact detection circuit 10 can detect the impact situation of the protection plate and output a corresponding alarm signal. The impact-resistant layer 202 is made of a hard material, such as high-strength steel plate or high-strength plastic, to protect the internal components of the protection plate from external impacts. The buffer layer 203 is a buffer layer made of aluminum, stainless steel, or polypropylene, and is a material with an energy-absorbing and buffering effect, such as aluminum honeycomb, which is usually used to absorb and disperse the impact energy and reduce damage to the internal components.

[0075] At least one impact detection circuit 10 is provided on the protection plate 20, which can output a logic alarm signal when the impact energy received by the protection plate 20 is greater than or equal to a preset impact energy, so as to warn the driver or the system monitoring center, so as to process the protection plate 20 in time. At the same time, a plurality of impact detection circuits 10 are provided on the protection plate 20. The driver or the system monitoring center can obtain the position information of the impact damage of the protection plate 20 according to the received logic alarm signal, improving the accuracy of impact detection.

[0076] It should be noted that each layer of the protection plate 20 is adhered by a hot melt adhesive film, that is, the insulating material outside the etched wire can be removed, and the hot melt adhesive film is used as the insulating material.

[0077] It should be noted that the impact detection circuit 10 can be arranged on a single-layer board structure, or between simple sandwich structures, or in a composite board with a complex structure. The protection plate for the application of the impact detection circuit 10 and the specific setting position are not limited herein.

[0078] It should be noted that by arranging multiple layers of impact detection circuits 10 in a direction perpendicular to the protection plate 20, the estimation of the impact energy level can be realized. Two layers of impact detection circuits 10 are connected in parallel, and the severity of the damage to the protection plate 20 is judged by detecting whether there is a voltage signal in the detection circuit.

[0079] Since the processing and functions realized by the protection plate and the battery pack in this embodiment are basically corresponding to the embodiments, principles and examples of the foregoing impact detection circuit, for the details not described in the description of this embodiment, reference can be made to the relevant descriptions in the foregoing embodiments, and details are not repeated here.

[0080] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. An impact detection circuit, applied to a protective plate, characterized in that: It includes an impact detection unit and a logic control unit, wherein the impact detection unit is electrically connected to the logic control unit; When the impact energy received by the protective plate is greater than or equal to the preset impact energy, the impact detection unit changes from the first state to the second state, and the logic control unit is used to output a logic alarm signal when the impact detection unit is in the second state.

2. The impact detection circuit according to claim 1, characterized in that: The impact detection unit includes a first wire, which is distributed on the protection plate, and two ends of the first wire are electrically connected to the logic control unit respectively.

3. The impact detection circuit according to claim 2, characterized in that: The first conducting wires are distributed on the protective plate in an "S"-shaped ring structure arrangement, a straight line side-by-side arrangement, or a horizontal and vertical grid arrangement.

4. The impact detection circuit according to claim 2, characterized in that: The first wire and the protection plate are insulated by an insulating material, and the insulating material is a rubber film or an insulating layer of the outer wall of the first wire.

5. The impact detection circuit according to claim 2, characterized in that: The first conductive wire is at least one of a metal etching conductive wire, an enameled wire and a carbon fiber conductive wire.

6. The impact detection circuit according to claim 2, characterized in that: The impact detection unit further includes a first resistor, a first end of the first resistor is electrically connected to any end of the first wire, and a second end of the first resistor is electrically connected to the logic control unit.

7. The impact detection circuit according to claim 1, characterized in that: The logic control unit includes a second resistor and a first transistor, the first end of the second resistor is used to be electrically connected to the first power supply, the second end of the second resistor is respectively electrically connected to the base of the first transistor and the first end of the impact detection unit, the collector of the first transistor is used to be electrically connected to the second power supply, and the emitter of the first transistor is respectively electrically connected to the second end of the impact detection unit and the ground.

8. The impact detection circuit according to any one of claims 1 to 7, characterized in that: The impact detection circuit also includes a filtering unit, a first end of the filtering unit is electrically connected to the second power supply and the logic control unit respectively, a second end of the filtering unit is grounded, and the filtering unit is used to filter out high-frequency signals in the power supply voltage output by the second power supply.

9. A protective plate, characterized in that: It comprises a protective plate body and at least one impact detection circuit as described in any one of claims 1 to 8, wherein the protective plate body comprises a first protective layer, an anti-impact layer, a buffer layer, and a second protective layer, wherein the buffer layer is arranged on the second protective layer, the anti-impact layer is arranged on the buffer layer, the first protective layer is arranged on the anti-impact layer, the impact detection circuit is arranged between the first protective layer and the anti-impact layer, or the impact detection circuit is arranged between the anti-impact layer and the buffer layer, or the impact detection circuit is arranged between the buffer layer and the second protective layer.

10. The protective plate according to claim 9, characterized in that: The buffer layer is made of aluminum, stainless steel or polypropylene.

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