External force impact detection plate

Abstract

An external force impact detection plate comprises a protection plate and a detection module. Sensing circuits are arranged on the whole plate face of the protection plate in an array mode, the sensing circuits are connected with the detection module, the sensing circuits are used for sensing external force impact borne by the external force impact detection plate so as to change electrical parameters of the sensing circuits, and the detection module is used for detecting the external force impact of the external force impact detection plate according to the sensing circuits with the changed electrical parameters. And determining the position and strength of the external force impact on the external force impact detection plate and outputting an early warning signal. When the external force impact detection plate is impacted by external force and causes damage to the protection plate, the sensing circuit can sense the external force impact in time, and accurate detection of the external force impact position and strength is realized.

Description

Technical Field

[0001] This application belongs to the technical field of batteries, and particularly relates to an external force impact detection board. Background Art

[0002] At present, the battery pack, as the most core power supply component in a new energy vehicle, determines key indicators such as the vehicle's cruising range, cost, service life, and safety. Currently, existing battery packs are assembled onto the vehicle as an independent assembly. Among them, the electrical, thermal management, battery management system, etc. in the battery pack are integrated and fixed inside the battery pack. The protection board of the battery pack not only plays a role in supporting and carrying the internal components of the battery pack but also plays a role in the safety protection of the battery pack. However, the protection board of the battery pack at the bottom of the vehicle is easily damaged to varying degrees due to being bumped, scratched, and squeezed by foreign objects, which poses a serious threat to the safety of the battery pack. However, due to the strong concealment of the damage to the bottom protection board, it may be impossible for the driver and passengers to detect the damage to the bottom protection board in time by observation. If it cannot be detected and effectively controlled in time, it is very likely to cause serious accidents such as the battery pack catching fire or exploding. Utility Model Content

[0003] The purpose of this application is to provide an external force impact detection board, aiming to solve the problem that it is difficult to detect damage to traditional protection boards in real time.

[0004] The first aspect of the embodiment of this application provides an external force impact detection board, including: a protection board and a detection module; a sensing circuit is arranged in an array inside or on the entire surface of the protection board, the sensing circuit is connected to the detection module, the sensing circuit is used to sense the external force impact received by the external force impact detection board, and then change its own electrical parameters through the external force impact, and the detection module is used to determine the position and intensity of the external force impact received by the external force impact detection board according to the sensing circuit whose electrical parameters have changed, and output a warning signal.

[0005] In one embodiment, the detection module includes a power supply unit and a detection unit, and the sensing circuit includes a current limiting unit and an induction unit; the first end of the current limiting unit is connected to the power supply unit, the second end of the current limiting unit is respectively connected to the first end of the induction unit and the detection unit, and the second end of the induction unit is respectively connected to the power supply unit and the detection unit; the power supply unit is used to provide a power supply voltage; the induction unit is used to sense the external force impact received by the external force impact detection board and change its own conduction impedance; the detection unit is used to detect the impedance of the induction unit.

[0006] In one embodiment, the sensing unit includes a plurality of parallel conductive branches. The first ends of the conductive branches form the first end of the sensing unit, and the second ends of the conductive branches form the second end of the sensing unit. The conductive branches are configured to break when the external force impact on the external force impact detection plate is greater than a preset impact energy threshold.

[0007] In one embodiment, the conductive branch includes a sensing resistor. The first end of the sensing resistor is connected to the first end of the sensing unit through a first connecting wire, and the second end of the sensing resistor is connected to the second end of the sensing unit through a second connecting wire. The first connecting wire and the second connecting wire are at least one of a metal etched wire, an enameled wire, and a carbon fiber wire.

[0008] In one embodiment, the conductive branch includes a third connecting wire. The first end of the third connecting wire forms the first end of the conductive branch, and the second end of the third connecting wire forms the second end of the conductive branch.

[0009] In one embodiment, one sensing unit includes N conductive branches. The resistance of the conductive branch is X, and the value range of X is from 1 KΩ to 100 KΩ. The value range of the resistance of the current limiting unit is [X / N, X / 2].

[0010] In one embodiment, the sensing circuit includes a plurality of the sensing units. The respective conductive branches of the same sensing unit are arranged parallel to each other on the protection plate. One sensing unit includes 2 to 10 conductive branches, and the distance between adjacent conductive branches is 3 mm to 50 mm. In the plane where the sensing circuit is located, at least two of the conductive branches in the sensing units are perpendicular to each other.

[0011] In one embodiment, an insulating layer is further included. The insulating layer is used to wrap the sensing circuit, and the material of the insulating layer includes at least one of hot melt adhesive, plastic, and silicone rubber.

[0012] In one embodiment, the protection plate includes a stacked upper protection layer, an impact resistance layer, a buffer layer, and a lower protection layer. The sensing circuit is arranged on one or more of the upper protection layer, the impact resistance layer, the buffer layer, and the lower protection layer.

[0013] In one embodiment, the protection plate includes a protection layer, and the sensing circuit is woven inside the protection layer.

[0014] The beneficial effects of the embodiments of the present application compared with the prior art are as follows: When the external force impact detection plate is subjected to an external force impact and causes damage to the protection plate, the sensing circuit can sense the external force impact in a timely manner, and accurately detect the position and intensity of the external force impact. Description of the Drawings

[0015] Figure 1 Structural schematic diagram of the external force impact detection board provided by an embodiment of the present application;

[0016] Figure 2 Example circuit schematic diagram of the detection module and the sensing circuit provided by an embodiment of the present application;

[0017] Figure 3 Example circuit diagram of damage analysis provided by an embodiment of the present application;

[0018] Figure 4 Example circuit diagram of damage analysis provided by an embodiment of the present application;

[0019] Figure 5 Another example circuit diagram of damage analysis provided by an embodiment of the present application;

[0020] Figure 6 Another example circuit diagram of damage analysis provided by an embodiment of the present application;

[0021] Figure 7 Another example circuit diagram of damage analysis provided by an embodiment of the present application;

[0022] Figure 8 Another example circuit diagram of damage analysis provided by an embodiment of the present application;

[0023] Figure 9 Another example circuit diagram of damage analysis provided by an embodiment of the present application;

[0024] Figure 10 Another example circuit diagram of damage analysis provided by an embodiment of the present application;

[0025] Figure 11 Structural schematic diagram of the sensing circuit provided by an embodiment of the present application;

[0026] Figure 12 Example circuit diagram of the detection module and the sensing circuit provided by an embodiment of the present application;

[0027] Figure 13 Structural schematic diagram of the protection board provided by an embodiment of the present application;

[0028] Figure 14 Another structural schematic diagram of the protection board provided by an embodiment of the present application;

[0029] Figure 15 Structural schematic diagram of the battery provided by an embodiment of the present application;

[0030] Figure 16Structural schematic diagram of an automobile provided by an embodiment of the present application. Detailed implementation manners

[0031] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer and more understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0032] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0033] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0034] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality of" means two or more unless otherwise specifically defined.

[0035] Figure 1 The structural schematic diagram of the external force impact detection plate provided by an embodiment of the present application is shown. For the convenience of description, only the parts related to this embodiment are shown and are described in detail as follows:

[0036] The external force impact detection board 10 includes: a protection board 100 and a detection module 200. At least one sensing circuit 300 is arranged in an array inside or on the entire surface of the protection board 100. Each sensing circuit 300 is connected to the detection module 200. The sensing circuit 300 is used to sense the external force impact received by the external force impact detection board 10, and then change its own electrical parameters due to the external force impact. The detection module 200 is used to determine the position and intensity of the external force impact received by the external force impact detection board 10 based on the sensing circuit 300 whose electrical parameters have changed, and output a warning signal. It can be understood that the detection module 200 can be fixed on the edge of the protection board 100 or other places to prevent the detection module 200 from being damaged when the protection board 100 is impacted. The detection module 200 can also be embedded in the protection board 100 to reduce the space occupation. The specific position of the detection module 200 can be set according to actual needs.

[0037] When the external force impact detection board 10 is subjected to an external force impact and causes damage to the protection board 100, the sensing circuit 300 can promptly sense the external force impact, accurately detect the position and intensity of the external force impact, and output a corresponding warning signal. The warning signal is used to indicate that the external force impact detection board 10 has been damaged, realizing the warning function.

[0038] In some embodiments, the sensing circuit 300 can be arranged on any one or both surfaces of the protection board 100, or can also be woven into the protection board 100. The area and position of the sensing circuit 300 can be configured according to actual needs.

[0039] In some embodiments, the detection module 200 can be fixed at the edge of the protection board 100. The specific position of the detection module 200 can be set according to actual needs.

[0040] In one embodiment, as Figure 2 shown, the detection module 200 includes a power supply unit 210 and a detection unit 220, and the sensing circuit 300 includes a current limiting unit 310 and an induction unit 320.

[0041] The first end of the current limiting unit 310 is connected to the power supply unit 210, and the second end of the current limiting unit 310 is respectively connected to the first end of the induction unit 320 and the detection unit 220. The second end of the induction unit 320 is respectively connected to the power supply unit 210 and the detection unit 220. The induction unit 320 is used to sense the external force impact received by the external force impact detection board 10 and change its own conduction impedance. The power supply unit 210 is used to provide a power supply voltage, and the detection unit 220 is used to detect the impedance of the induction unit 320.

[0042] It should be noted that the sensing unit 320 needs to be arranged on the protection plate 100, and the range covered by the sensing unit 320 is the range where external force impacts can be detected. After the power supply voltage provided by the power supply unit 210 is applied to the sensing unit 320, the detection unit 220 can detect the voltage at both ends of the sensing unit 320. Since the conduction impedance of the sensing unit 320 changes after being subjected to an external force impact, the detection unit 220 can determine the change in the conduction impedance of the sensing unit 320 based on the voltage at both ends of the sensing unit 320, and then judge the intensity of the external force impact. According to the change conditions of the conduction impedance of different sensing units 320, it can be judged which sensing units 320 have been subjected to external force impacts, so as to determine the position of the external force impact.

[0043] Exemplarily, in some embodiments, after the sensing unit 320 is subjected to an external force impact, part of the circuit in the sensing unit 320 will be open-circuited, resulting in a change in the conduction impedance of the sensing unit 320, and then changing the voltage value at both ends of the sensing unit 320.

[0044] In one embodiment, as Figure 2 shown, the sensing unit 320 includes a plurality of parallel conductive branches 321. The first ends of the conductive branches 321 form the first-end connection of the sensing unit 320, and the second ends of the conductive branches 321 form the second-end connection of the sensing unit 320. The conductive branches 321 are used to disconnect when the external force impact received by the external force impact detection plate 10 is greater than a preset impact energy threshold. Among them, the preset impact energy threshold corresponds to the energy corresponding to the maximum impact that the conductive branch 321 can withstand, and the preset impact energy threshold is determined by the specific material and structure of the protection plate 100 and is affected by the specific material and arrangement form of the conductive branch 321.

[0045] It can be understood that since a plurality of conductive branches 321 are connected in parallel, as long as any conductive branch 321 is disconnected due to an external force impact, the resistance value of the entire sensing unit 320 will increase, and the voltage applied to the sensing unit 320 will also increase accordingly. After all the conductive branches 321 are disconnected, the voltage applied to the sensing unit 320 will reach the maximum value. The detection unit 220 can judge the situation of the external force impact received by the sensing unit 320 based on the voltage change at both ends of the sensing unit 320.

[0046] The intensity of the external force impact can be determined according to the number of disconnected conductive branches 321. The greater the intensity of the external force impact, the greater the damage received by the external force impact detection plate 10, and the more the number of disconnected conductive branches 321.

[0047] It can be understood that when there are multiple sensing circuits 300, the intensity of the external force impact can be judged according to the number of layers of the sensing circuits 300 affected.

[0048] In one embodiment, the conduction impedances of the respective conductive branches 321 in the same sensing unit 320 are not equal to each other.

[0049] It can be understood that if the conduction impedances of the respective conductive branches 321 in the same sensing unit 320 are not equal to each other, by reasonably configuring the conduction impedances of the respective conductive branches 321, it is possible to achieve that when different numbers of conductive branches 321 in the sensing unit 320 are disconnected, the voltages across the two ends of the sensing unit 320 will also be different, and when the same number of conductive branches 321 are disconnected, disconnecting different conductive branches 321 can make the voltages across the two ends of the sensing unit 320 different. Thus, according to the specific values of the voltages across the two ends of the sensing unit 320, it is possible to accurately locate which conductive branches 321 are disconnected, and further accurately locate the position and range of the impact. At the same time, different sensing units 320 can also cooperate with each other. When an external force impact simultaneously involves multiple sensing units 320, by respectively locating the positions and ranges of the external force impacts on each sensing unit 320, the position and intensity of the external force impact can be determined.

[0050] Exemplarily, in some embodiments, a sensing unit 320 includes three conductive branches 321 with conduction impedances of 10 Ω, 20 Ω, and 30 Ω respectively. When the 10-Ω conductive branch 321 is disconnected, the total conduction impedance of the sensing unit 320 is 12 Ω. When the 20-Ω conductive branch 321 is disconnected, the total conduction impedance of the sensing unit 320 is 7.5 Ω. When the 30-Ω conductive branch 321 is disconnected, the total conduction impedance of the sensing unit 320 is approximately 6.7 Ω. When any two of the conductive branches 321 are disconnected, the total conduction impedance of the sensing unit 320 is 10 Ω, 20 Ω, or 30 Ω respectively. In the case of different conductive branches 321 being disconnected, the total conduction impedance of the sensing unit 320 is also different. Therefore, by detecting the total conduction impedance of the sensing unit 320, it is possible to determine which specific conductive branch 321 is disconnected, achieving the positioning of the damage location.

[0051] In one embodiment, as Figure 3 shown, the conductive branch 321 includes a sensing resistor. As Figure 3 shown in the circuit, it specifically includes a sensing resistor R1, a sensing resistor R2, and a sensing resistor R3. The sensing resistor R1, the sensing resistor R2, and the sensing resistor R3 are connected in parallel with each other. The first end of the sensing resistor is connected to the first end of the sensing unit 320 through a first connecting wire, and the second end of the sensing resistor is connected to the second end of the sensing unit 320 through a second connecting wire.

[0052] It can be understood that the resistances of the first connecting wire and the second connecting wire can be ignored.

[0053] In some embodiments, the current limiting unit 310 includes a voltage dividing resistor. As Figure 3The circuit shown specifically includes a voltage-dividing resistor R0.

[0054] It can be understood that when the protective plate 100 is damaged by an external impact and at the same time the first connecting wire and / or the second connecting wire of some of the conductive branches 321 therein are disconnected, the impedance of the induction unit 320 will change accordingly. At the same time, in one induction unit 320, the number of disconnected conductive branches 321 is different, and the impedance of the induction unit 320 is also different. According to the impedance of the induction unit 320, the number of disconnected conductive branches 321 can be determined, and then the intensity of the external impact can be determined.

[0055] In one embodiment, the first connecting wire and the second connecting wire are at least one of a metal etched wire, an enameled wire, and a carbon fiber wire.

[0056] According to the material of the protective plate 100, appropriate wire materials can be selected for the first connecting wire and the second connecting wire. Exemplarily, the first connecting wire and the second connecting wire can use metal wires without an insulating layer, and only by using hot melt adhesive to fix the sensing circuit 300, the isolation between the respective conductive branches 321 can be achieved.

[0057] In one embodiment, the conductive branch 321 includes a third connecting wire. The first end of the third connecting wire constitutes the first end of the conductive branch 321, and the second end of the third connecting wire constitutes the second end of the conductive branch 321.

[0058] It can be understood that the third connecting wire has a certain impedance and can be used to replace the induction resistor. By adjusting the thickness and material of the third connecting wire, the effect of adjusting the resistance value of the third connecting wire can be achieved.

[0059] In one embodiment, the third connecting wire is at least one of a nickel-chromium wire, a metal etched wire, an enameled wire, and a carbon fiber wire.

[0060] According to the material of the protective plate 100, appropriate wire materials can be selected for the third connecting wire. Exemplarily, when the material of the protective plate 100 is an insulating material, the third connecting wire can use metal wires without an insulating layer, and only by using hot melt adhesive to fix the sensing circuit 300, the isolation between the respective conductive branches 321 can be achieved. The material of the third connecting wire can preferably be a nickel-chromium wire.

[0061] In one embodiment, one induction unit 320 includes N conductive branches 321. The resistance of the conductive branch 321 is X, and the value range of X is 1 KΩ to 100 KΩ. The value range of the resistance of the current-limiting unit 310 is [X / N, X / 2]. The resistances of the respective conductive branches 321 can be the same or different.

[0062] Exemplarily, such as Figure 3As shown, in some embodiments, an induction unit 320 includes three conductive branches 321. Each conductive branch 321 includes an induction resistor of 1200 Ω. The current limiting unit 310 includes a voltage dividing resistor of 600 Ω, and the power supply voltage is 12V. If the external force impact detection board 10 is subjected to an external force impact and one of the conductive branches 321 is broken by the impact shearing effect, then at this time, the detection module 200 can detect that the overall resistance value of the induction unit 320 has increased by 50%, and the voltage across the induction unit 320 has increased by 25%. The detection module 200 can determine that the external force impact detection board 10 in the corresponding area of the induction unit 320 is slightly damaged.

[0063] Exemplarily, as Figure 4 As shown, in some embodiments, an induction unit 320 includes three conductive branches 321. Each conductive branch 321 includes an induction resistor of 1200 Ω. The current limiting unit 310 includes a voltage dividing resistor of 600 Ω, and the power supply voltage is 12V. If the external force impact detection board 10 is subjected to an external force impact and two of the conductive branches 321 are broken by the impact shearing effect, then at this time, the detection module 200 can detect that the overall resistance value of the induction unit 320 has increased by 200%, and the voltage across the induction unit 320 has increased by 66.7%. The detection module 200 can determine that the external force impact detection board 10 in the corresponding area of the induction unit 320 is slightly damaged.

[0064] Exemplarily, as Figure 5 As shown, in some embodiments, an induction unit 320 includes three conductive branches 321. Each conductive branch 321 includes an induction resistor of 1200 Ω. The current limiting unit 310 includes a voltage dividing resistor of 600 Ω, and the power supply voltage is 12V. If the external force impact detection board 10 is subjected to an external force impact and all three conductive branches 321 are broken by the impact shearing effect, then at this time, the detection module 200 can detect that the overall resistance value of the induction unit 320 is +∞, and the voltage across the induction unit 320 is 12V. The detection module 200 can determine that the external force impact detection board 10 in the corresponding area of the induction unit 320 is severely damaged.

[0065] Exemplarily, as Figure 6As shown, in some embodiments, the external force impact detection board 10 includes two sensing circuits 300. Each sensing circuit 300 includes three conductive branches 321. Each conductive branch 321 includes an induction resistor of 1200 Ω. The current limiting unit 310 includes a voltage dividing resistor of 600 Ω, and the power supply voltage is 12V. If the external force impact detection board 10 is subjected to an external force impact and one conductive branch 321 in each sensing circuit 300 is broken by the impact shearing effect, then at this time, the detection module 200 can detect that the overall resistance value of each induction unit 320 has increased by 50%, and the voltage across each induction unit 320 has increased by 25%. The detection module 200 can determine that the external force impact detection board 10 in the area corresponding to this induction unit 320 is moderately damaged.

[0066] Exemplarily, as Figure 7 As shown, in some embodiments, the external force impact detection board 10 includes two sensing circuits 300. Each sensing circuit 300 includes three conductive branches 321. Each conductive branch 321 includes an induction resistor of 1200 Ω. The current limiting unit 310 includes a voltage dividing resistor of 600 Ω, and the power supply voltage is 12V. If the external force impact detection board 10 is subjected to an external force impact and one conductive branch 321 of one sensing circuit 300 is broken by the impact shearing effect, and two conductive branches 321 of the other sensing circuit 300 are broken, then at this time, the detection module 200 can detect that the overall resistance value of one induction unit 320 has increased by 50%, and the voltage across it has increased by 25%. For the other induction unit 320, the overall resistance value has increased by 200%, and the voltage across it has increased by 66.7%. The detection module 200 can determine that the external force impact detection board 10 in the area corresponding to this induction unit 320 is severely damaged.

[0067] Exemplarily, as Figure 8 As shown, in some embodiments, an induction unit 320 includes two conductive branches 321. Each conductive branch 321 includes an induction resistor of 1200 Ω. The current limiting unit 310 includes a voltage dividing resistor of 600 Ω, and the power supply voltage is 12V. If the external force impact detection board 10 is subjected to an external force impact and one of the conductive branches 321 is broken by the impact shearing effect, then at this time, the detection module 200 can detect that the overall resistance value of the induction unit 320 has increased by 100%, and the voltage across the induction unit 320 has increased by 33.3%. The detection module 200 can determine that the external force impact detection board 10 in the area corresponding to this induction unit 320 is moderately damaged.

[0068] Exemplarily, as Figure 9As shown, in some embodiments, an induction unit 320 includes ten conductive branches 321, each of the conductive branches 321 includes an induction resistor of 1200 Ω, the current limiting unit 310 includes a voltage dividing resistor of 600 Ω, and the power supply voltage is 12 V. If the external force impact detection board 10 is subjected to an external force impact and four of the conductive branches 321 are broken by the impact shearing effect, then at this time, the detection module 200 can detect that the overall resistance value of the induction unit 320 has increased by 66.7%, the voltage across the induction unit 320 has increased by 50%, and the detection module 200 can determine that the external force impact detection board 10 in the corresponding area of the induction unit 320 is moderately damaged.

[0069] Exemplarily, as Figure 10 As shown, in some embodiments, an induction unit 320 includes three conductive branches 321, each of the conductive branches 321 includes a third connecting wire of 120 Ω, and the power supply voltage is 12 V. If the external force impact detection board 10 is subjected to an external force impact and one of the conductive branches 321 is broken by the impact shearing effect, then at this time, the detection module 200 can detect that the overall resistance value of the induction unit 320 has increased by 50%, the voltage across the induction unit 320 has increased by 33.3%, and the detection module 200 can determine that the external force impact detection board 10 in the corresponding area of the induction unit 320 is slightly damaged.

[0070] When the resistance of the current limiting unit 310 and the power supply voltage remain unchanged, the voltage applied to the induction unit 320 will also change accordingly. The broken conductive branch 321 can be determined through the voltage of the induction unit 320, and then the position where the external force impact occurs can be determined. The greater the number of broken conductive branches 321, the greater the intensity of the external force impact that can be judged.

[0071] In one embodiment, the sensing circuit 300 includes a plurality of induction units 320, and the respective conductive branches 321 of the same induction unit 320 are arranged in parallel on the protection board 100. An induction unit 320 includes 2 to 10 conductive branches 321, and the distance between adjacent conductive branches 321 is 3 mm to 50 mm.

[0072] It can be understood that by controlling the distance between adjacent conductive branches 321 and adjusting the density of the conductive branches 321 per unit area, the detection accuracy can be adjusted. Therefore, the density of the conductive branches 321 at the position where the protection board 100 is vulnerable to external force impact can be increased to improve the detection accuracy of the external force impact at this position.

[0073] In some embodiments, such as Figure 11As shown, the conductive branch 321 includes a sensing resistor, and the conductive branches 321 of the same sensing unit 320 are arranged parallel to each other on the protective plate 100, which may mean that the first connecting wires and / or the second connecting wires of the conductive branches 321 are parallel to each other.

[0074] In one embodiment, within the plane where the sensing circuit 300 is located, at least two sensing units 320 are stacked in one sensing circuit 300 , and the conductive branches 321 in the two sensing units 320 are perpendicular to each other.

[0075] When there is only one sensing unit 320, the length of the conductive branch 321 of the sensing unit 320 will affect the detection accuracy of the external force impact position. The longer the conductive branch 321 is, the lower the external force impact detection accuracy will be. By using two or more mutually perpendicular sensing units 320 to locate the external force impact from two directions, the detection accuracy of the external force impact can be further improved.

[0076] For example, in some embodiments, Figure 12 As shown, the conductive branch 321 includes a sensing resistor, and the two sensing units 320 are perpendicular to each other. Specifically, the first connecting wires or the second connecting wires of each conductive branch 321 of the two sensing units 320 can be perpendicular to each other. In this embodiment, the second connecting wire of one sensing unit 320 is perpendicular to the second connecting wire of the other sensing unit 320.

[0077] In one embodiment, the external force impact detection board 10 further includes an insulating layer, which is used to wrap the sensing circuit 300 to prevent leakage of the sensing circuit 300 and to prevent short circuits between the various electrical circuits in the sensing circuit 300. It is understood that the insulating layer can be fixed to the protective plate 100 by adhesive or other means to fix the sensing circuit 300 and isolate the various conductive branches 321.

[0078] In some embodiments, the insulating layer is made of at least one of hot melt adhesive, plastic, and silicone rubber. It is understood that the insulating layer may be an insulating structure inherent to the wires in the sensing circuit 300, or may be an insulating layer constructed during the manufacturing process of the protective plate 100. For example, the insulating layer may be a layer of hot melt adhesive film applied to the surface of the wires in the sensing circuit 300 using hot melt adhesive.

[0079] In one embodiment, the protective plate 100 includes an upper protective layer 110, an impact-resistant layer 120, a buffer layer 130 and a lower protective layer 140 that are stacked, and the sensing circuit 300 can be arranged on one or more layers of the upper protective layer 110, the impact-resistant layer 120, the buffer layer 130 and the lower protective layer 140.

[0080] For example, Figure 13As shown, in some embodiments, the lower protective layer 140 is the innermost protective layer, and the upper protective layer 110 is the outermost protective layer. The sensing circuit 300 is arranged between the upper protective layer 110 and the impact-resistant layer 120. Once the external force impact on the protective plate 100 penetrates the upper protective layer 110, the sensing circuit 300 can detect the external force impact.

[0081] It can be understood that the specific materials of the upper protective layer 110, the impact-resistant layer 120, the buffer layer 130, and the lower protective layer 140 can be set according to actual needs to achieve different effects.

[0082] In some embodiments, as Figure 14 shown, the lower protective layer 140 is the innermost protective layer, and the upper protective layer 110 is the outermost protective layer. Sensing circuits 300 are provided between the upper protective layer 110 and the impact-resistant layer 120, and between the buffer layer 130 and the lower protective layer 140. In the case where the sensing circuit 300 between the upper protective layer 110 and the impact-resistant layer 120 detects an external force impact, the magnitude of the external force impact can be further determined based on whether the sensing circuit 300 between the buffer layer 130 and the lower protective layer 140 detects the external force impact. When the sensing circuit 300 between the lower protective layer 140 and the buffer layer 130 also detects the external force impact, it can be determined that the external force impact has penetrated the upper protective layer 110, the impact-resistant layer 120, and the buffer layer 130, and the external force impact on the protective plate 100 is relatively large and severely damaged.

[0083] In one embodiment, the protective plate 100 includes a protective layer and skins covering both sides of the protective layer. The skins are mainly made of glass fiber reinforced resin materials, and the sensing circuit 300 is arranged inside the protective layer.

[0084] The sensing circuit 300 can be woven inside the protective layer or between the protective layer and the impact-resistant layer. When the sensing circuit 300 detects an external force impact, it can be determined that the external force impact has damaged the surface layer of the protective layer, posing a safety risk.

[0085] Figure 15 The structural schematic diagram of a battery provided by an embodiment of the present application is shown. For ease of description, only the parts related to this embodiment are shown and are described in detail as follows:

[0086] The battery 20 includes a battery pack 30 and the external force impact detection plate 10 as described in any one of the above embodiments.

[0087] The external force impact detection plate 10 is arranged on the side of the battery pack 30 that is vulnerable to external force impact to protect the battery pack 30 from being damaged by external force impact.

[0088] Figure 16The structural schematic diagram of a vehicle provided by an embodiment of the present application is shown. For the sake of convenience in description, only the parts related to this embodiment are shown and are described in detail as follows:

[0089] The vehicle 40 includes the external force impact detection plate 10 as in any one of the above embodiments. Among them, the vehicle 40 may specifically be an electric vehicle. In the chassis of the vehicle 40, a battery 20 as in any one of the above embodiments for driving the vehicle 40 is embedded. The external force impact detection plate 10 can be used to protect the battery pack 30 during the driving process of the vehicle 40 and detect the external force impact in real time through the external force impact detection plate 10 when being subjected to an external force impact. The control device of the vehicle 40 can be connected to the external force impact detection plate 10 to obtain the position and intensity of the external force impact.

[0090] Those skilled in the art can clearly understand that for the convenience and conciseness of description, only the above division of each functional unit and module is used as an example for illustration. In actual applications, the above functions can be allocated to different functional units and modules according to needs, that is, the internal structure of the device is divided into different functional units or modules to complete all or part of the functions described above. Each functional unit and module in the embodiment can be integrated in a processing unit, or each unit exists physically alone, or two or more units are integrated in one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit. In addition, the specific names of each functional unit and module are only for the convenience of mutual distinction and do not limit the protection scope of the present application. The specific working processes of the units and modules in the above system can refer to the corresponding processes in the foregoing method embodiments and will not be described in detail here.

[0091] In the above embodiments, the descriptions of each embodiment have their own emphases. For the parts not described in detail or recorded in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0092] The above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit them. 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 described in the foregoing embodiments or perform equivalent replacements for some of the technical features. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of each embodiment of the present application and should all be included in the protection scope of the present application.

Claims

1. An external force impact detection plate, characterized in that, Comprising: A protection plate and a detection module; A sensing circuit is arranged in an array inside or on the entire surface of the protection plate. The sensing circuit is connected to the detection module. The sensing circuit is used to sense the external force impact received by the external force impact detection plate, and changes its own electrical parameters through the external force impact. The detection module is used to determine the position and intensity of the external force impact received by the external force impact detection plate according to the sensing circuit whose electrical parameters have changed, and output a warning signal.

2. The external force impact detection board according to claim 1, characterized in that The detection module includes a power supply unit and a detection unit, and the sensing circuit includes a current limiting unit and an induction unit; The first end of the current limiting unit is connected to the power supply unit, the second end of the current limiting unit is respectively connected to the first end of the induction unit and the detection unit, and the second end of the induction unit is respectively connected to the power supply unit and the detection unit; The power supply unit is used to provide a power supply voltage; the induction unit is used to sense the external force impact received by the external force impact detection plate and change its own conduction impedance; the detection unit is used to detect the impedance of the induction unit.

3. The external force impact detection board according to claim 2, characterized in that, The induction unit includes a plurality of parallel conductive branches. The first ends of the conductive branches form the first end of the induction unit, and the second ends of the conductive branches form the second end of the induction unit; The conductive branch is used to disconnect when the external force impact received by the external force impact detection plate is greater than a preset impact energy threshold.

4. The external force impact detection board according to claim 3, wherein The conductive branch includes an induction resistor. The first end of the induction resistor is connected to the first end of the induction unit through a first connecting wire, and the second end of the induction resistor is connected to the second end of the induction unit through a second connecting wire; the first connecting wire and the second connecting wire are at least one of a metal etched wire, an enameled wire, and a carbon fiber wire.

5. The external force impact detection board according to claim 3, wherein The conductive branch includes a third connecting wire. The first end of the third connecting wire forms the first end of the conductive branch, and the second end of the third connecting wire forms the second end of the conductive branch.

6. The external force impact detection board according to claim 3, characterized in that, One induction unit includes N conductive branches. The resistance of the conductive branch is X, and the value range of X is from 1KΩ to 100KΩ. The value range of the resistance of the current limiting unit is [X / N, X / 2].

7. The external force impact detection board according to claim 3, characterized in that, The sensing circuit includes a plurality of the induction units. The respective conductive branches of the same induction unit are arranged parallel to each other on the protection plate. One induction unit includes 2 to 10 conductive branches, and the distance between adjacent conductive branches is 3mm to 50mm; In the plane where the sensing circuit is located, the conductive branches in at least two induction units are perpendicular to each other.

8. The external force impact detection board according to claim 3, characterized in that, It further includes an insulating layer, and the insulating layer is used to wrap the sensing circuit.

9. The external force impact detection board according to any one of claims 1 to 8, characterized in that, The protection plate includes a stacked upper protection layer, an impact resistance layer, a buffer layer, and a lower protection layer. The sensing circuit is arranged on one or more of the upper protection layer, the impact resistance layer, the buffer layer, and the lower protection layer.

10. The external force impact detection board according to any one of claims 1 to 8, characterized in that, The protection plate includes a protection layer, and the sensing circuit is woven inside the protection layer.

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