Protective plate

Abstract

The utility model is applicable to the technical field of batteries, and provides a protection plate, the protection plate comprises an upper skin, a detection assembly and a lower skin which are sequentially stacked, and the detection assembly comprises an anti-impact layer, a buffer layer and a detection layer; the anti-impact layer is located above the buffer layer, the buffer layer, the anti-impact layer and the detection layer are arranged in a stacked mode, the detection layer comprises a detection circuit, the detection circuit comprises a detection wire, and when the protection plate is impacted, the increase of the static pressure strength of the buffer layer improves the strain of the anti-impact layer at the impacted position, so that the detection wire is broken by an impact pit formed by impact; after the detection wire is broken by punching, the detection circuit outputs an alarm signal, and the static pressure strength range of the buffer layer is 1-50 MPa. According to the protection plate provided by the embodiment of the invention, the static pressure strength range of the buffer layer is regulated and controlled to be 1-50 MPa, when the protection plate is subjected to external impact, the impact pits with large fall formed by the buffer layer can thrust and break the detection wire, and then the damage detection sensitivity of the protection plate under the condition of high-energy impact is improved.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and in particular relates to a protective plate. Background Art

[0002] At present, a protective plate is usually set at the bottom of the battery pack to protect the battery pack from external impact damage such as collision, extrusion or scratching to a certain extent. However, when judging whether the protective plate is damaged by external impact, the existing technology usually uses mechanical sensors or detects through strain, displacement and other detection methods to detect possible damage to the protective plate. Due to the high cost of mechanical sensors and the limited coverage of the detection area, the existing detection methods have problems such as high detection cost, low detection sensitivity and reliability. These problems make it difficult for drivers and passengers to promptly eliminate potential safety hazards to driving after the battery pack is damaged by impact. Utility Model Content

[0003] The embodiments of the present application provide a protective plate that can solve the problems of high detection cost, low detection sensitivity and low reliability when detecting damage to the protective plate caused by external impact.

[0004] An embodiment of the present application provides a protective plate, comprising an upper skin, a detection assembly and a lower skin stacked in sequence, the detection assembly comprising an anti-impact layer, a buffer layer and a detection layer; the anti-impact layer is located above the buffer layer, the buffer layer, the anti-impact layer and the detection layer are stacked, the detection layer comprises a detection circuit, the detection circuit comprises a detection wire, when the protective plate is impacted, an increase in the static pressure strength of the buffer layer increases the strain of the anti-impact layer at the impacted location, so that the impact crater formed by the impact breaks the detection wire, after the detection wire is broken, the detection circuit outputs an alarm signal, wherein the static pressure strength of the buffer layer ranges from 1MPa to 50MPa.

[0005] In a possible implementation, the buffer layer is provided with a plurality of spaced-apart buffer holes, and the buffer holes penetrate the buffer layer in the thickness direction, wherein the plurality of spaced-apart buffer holes form a honeycomb structure of the buffer layer; the honeycomb structure is composed of a plurality of metal corrugated sheets symmetrically arranged around a preset plane, and every two metal corrugated sheets protrude in directions away from each other, so that a honeycomb-shaped buffer space is formed on the surfaces of every two metal corrugated sheets that are close to each other.

[0006] In a possible implementation, the detection layer is disposed between the upper skin and the anti-impact layer.

[0007] In a possible implementation, the detection circuit includes a power supply unit, a signal acquisition unit and a signal analysis and processing unit, wherein the signal acquisition unit is formed by arranging the detection wires, a first end of the power supply unit is connected to a first end of the signal acquisition unit, a second end of the signal acquisition unit is connected to a first end of the signal analysis and processing unit, and a second end of the signal analysis and processing unit is connected to a second end of the power supply unit;

[0008] When the protective plate is subjected to an impact greater than or equal to a preset impact energy threshold, the signal acquisition unit collects a signal that the detection wire is broken, and sends the signal that the detection wire is broken to the signal analysis and processing unit. The signal analysis and processing unit outputs an alarm signal after receiving the signal that the detection wire is broken.

[0009] In a possible implementation manner, the detection wire is at least one of a metal etching wire, an enameled wire, and a carbon fiber wire.

[0010] In a possible implementation, the detection wire includes a plurality of straight segments, and the plurality of straight segments are arranged side by side or in a grid shape, or the detection wire includes a plurality of straight segments and a plurality of connecting segments, and the plurality of straight segments are arranged side by side, and the straight segments and the connecting segments are alternately connected in sequence, and the spacing between two adjacent side-by-side straight segments is 3 mm to 50 mm.

[0011] In a possible implementation manner, the buffer layer is a buffer layer made of aluminum, stainless steel or polypropylene.

[0012] In a possible implementation manner, the buffer layer further includes a functional material filled in the buffer hole.

[0013] In a possible implementation manner, the detection wire and the protection plate are insulated by an insulating material, and the insulating material is a glue film or an insulating layer of an outer wall of the detection wire.

[0014] In a possible implementation, the protective plate includes a plurality of the detection layers, and each of the detection layers is disposed between any two adjacent layers of the upper skin, the anti-impact layer, the buffer layer, and the lower skin.

[0015] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0016] The protective plate provided in the embodiment of the present application includes an upper skin, a detection assembly and a lower skin which are stacked in sequence, the detection assembly includes an anti-impact layer, a buffer layer and a detection layer; the anti-impact layer is located above the buffer layer, the buffer layer, the anti-impact layer and the detection layer are stacked, the detection layer includes a detection circuit, the detection circuit includes a detection wire, when the protective plate is impacted, the increase in the static pressure strength of the buffer layer increases the strain of the anti-impact layer at the impacted point, so that the impact crater formed by the impact breaks the detection wire, after the detection wire is broken, the detection circuit outputs an alarm signal, wherein the static pressure strength range of the buffer layer is 1MPa to 50MPa. Therefore, the protective plate provided in the embodiment of the present application adjusts the static pressure strength range of the buffer layer to 1MPa~50MPa, so that the protective plate can control the deformation range while having a certain compressive strength, thereby forming an impact pit with a large drop. When the protective plate is subjected to external impact, the buffer layer will be deformed, and the impact pit formed by local deformation will break the detection wire in the detection circuit. The protective plate provided in the embodiment of the present application can timely and accurately detect whether the protective plate is damaged by foreign object impact without using high hardware costs such as sensors, thereby improving the damage detection sensitivity of the protective plate when it is subjected to high-energy impact, so as to remind the user to repair or replace the protective plate and ensure the battery safety of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 It is a structural schematic diagram of a protective plate provided in one embodiment of the present application;

[0019] Figure 2 It is a schematic diagram of a detection wire arrangement method provided by an embodiment of the present application;

[0020] Figure 3 It is a schematic diagram of another detection wire arrangement method provided in an embodiment of the present application;

[0021] Figure 4 It is a schematic diagram of the overall structure of a honeycomb structure provided by an embodiment of the present application;

[0022] Figure 5 This is a schematic diagram of the structure of another protective plate provided in an embodiment of the present application;

[0023] Figure 6 This is a schematic diagram of the structure of another protective plate provided in an embodiment of the present application;

[0024] Figure 7 It is a schematic diagram of a honeycomb structure filled with functional materials provided in one embodiment of the present application. DETAILED DESCRIPTION

[0025] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may 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 prevent unnecessary details from obstructing the description of the present application.

[0026] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of 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 combinations thereof.

[0027] It should also be understood that the term “and / or” used in the specification and appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0028] In the description of the present invention, it is necessary to understand that the terms "width", "thickness", "up", "down", "vertical", "horizontal", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 cannot be understood as a limitation on the present invention.

[0029] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0030] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. appearing in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways.

[0031] The protective plate in the prior art uses plastic material as buffer material. When the protective plate is subjected to external impact, the impact pit generated in the impact area of ​​the buffer layer affected by the impact energy is deformed too gently, which may cause the external impact to be unable to cut the detection wire pre-buried above the impact-resistant layer. Therefore, when detecting whether the protective plate is damaged by external impact, using mechanical sensors or detecting the external impact damage of the protective plate through strain, displacement, etc. will result in high detection cost, low detection sensitivity, low reliability, etc., that is, the existing method cannot promptly detect the situation where the current protective plate is subjected to high-energy impact and its protective effect is weakened, resulting in the protective plate continuing to work "with damage", thereby posing a hidden danger to the battery safety of the entire vehicle.

[0032] Based on the above problems, the protective plate provided in the embodiment of the present application includes an upper skin, a detection assembly and a lower skin which are stacked in sequence, the detection assembly includes an anti-impact layer, a buffer layer and a detection layer; the anti-impact layer is located above the buffer layer, the buffer layer, the anti-impact layer and the detection layer are stacked, the detection layer includes a detection circuit, the detection circuit includes a detection wire, when the protective plate is impacted, the increase in the static pressure strength of the buffer layer increases the strain of the anti-impact layer at the impact point, so that the impact crater formed by the impact breaks the detection wire, after the detection wire is broken, the detection circuit outputs an alarm signal, wherein the static pressure strength range of the buffer layer is 1MPa to 50MPa. Therefore, the protective plate provided in the embodiment of the present application adjusts the static pressure strength range of the buffer layer to 1MPa~50MPa, so that the protective plate can control the deformation range while having a certain compressive strength, forming an impact pit with a large drop. When the protective plate is subjected to external impact, the buffer layer will be deformed. Since the buffer material of the buffer layer is selected from a buffer material with higher strength than the plastic part, the buffer layer of the embodiment of the present application can bear the impact energy more concentratedly, and the impact energy is not easy to spread to other areas, so that the area affected by the impact appears as an impact pit. Therefore, there is almost no obvious concave deformation near the impact pit. At this time, the impact pit generated by the impact will be deeper and the opening width will be smaller. Therefore, in the process of forming the impact pit by local deformation, the detection wire in the detection circuit will be broken. The protective plate provided in the embodiment of the present application can timely and accurately detect whether the protective plate has been damaged by foreign body impact without using high hardware costs such as sensors. Since the impact pit generated by external impact in the buffer layer will be deeper and the opening width will be smaller, the damage detection sensitivity of the protective plate under high-energy impact will be improved, so as to remind the user to repair or replace the protective plate and ensure the battery safety of the battery pack.

[0033] In order to illustrate the technical solution described in this application, a specific embodiment is provided below for illustration.

[0034] Figure 1 FIG. 1 is a schematic diagram showing the structure of a protective plate 100 provided in an embodiment of the present application. Figure 1 As shown, the protective plate 100 includes an upper skin 1, a detection assembly and a lower skin 4 which are stacked in sequence, the detection assembly includes an impact-resistant layer 2, a buffer layer 3 and a detection layer 5; the impact-resistant layer 2 is located above the buffer layer 3, the buffer layer 3, the impact-resistant layer 2 and the detection layer 5 are stacked, the detection layer 5 includes a detection circuit 51, and the detection circuit 51 includes a detection wire 511 ( Figure 2 As shown in the figure, when the protective plate 100 is impacted, the buffer layer 3 is deformed, and the deformation will produce an impact pit. In the process of local deformation forming the impact pit, the detection wire 511 will be broken, causing the detection circuit to output an alarm signal, wherein the static pressure strength range of the buffer layer is 1MPa to 50MPa.

[0035] Among them, the upper skin 1 is located at the top of the protective plate 100, and is used to provide external protection for the detection component to ensure that the internal detection component is not directly exposed to the external environment, thereby isolating and protecting the detection component. The detection component is located between the upper skin 1 and the lower skin 4, and is used to detect the impact of the protective plate 100. When the protective plate 100 is severely impacted, that is, when the protective plate 100 is damaged by a high-energy impact, the detection wire 511 in the detection layer 5 is broken, thereby triggering the signal analysis and processing unit 513 in the detection circuit 51 connected to the detection wire 511 to send an alarm signal to remind the user to repair or replace the protective plate 100. The lower skin 4 is located at the bottom of the protective plate 100, and can also provide a certain degree of protection for the protective plate 100.

[0036] In a specific example, the buffer layer 3 is used to focus the impact energy received by the upper skin 1 so as to form an impact crater within a local impact range. The impact crater is used to break the detection wire 511 passing through the impact crater, thereby triggering the signal analysis and processing unit 513 in the detection circuit 51 connected to the detection wire 511 to send an alarm signal to remind the user to repair or replace the protective plate 100.

[0037] When the external impact is carried out in the direction from the upper skin 1 to the lower skin 4 (the external impact is in the direction perpendicular to the plane of the protective plate 100), the impact-resistant layer 2 is located above the buffer layer 3, and the detection layer 5, the impact-resistant layer 2 and the buffer layer 3 are stacked, there are three arrangement orders of the layer structure of the protective plate 100, namely: from top to bottom, it includes the upper skin 1, the detection layer 5, the impact-resistant layer 2, the buffer layer 3 and the lower skin 4; from top to bottom, it includes the upper skin 1, the impact-resistant layer 2, the buffer layer 3, the detection layer 5 and the lower skin 4; and from top to bottom, it includes the upper skin 1, the impact-resistant layer 2, the detection layer 5, the buffer layer 3 and the lower skin 4.

[0038] Next, taking the example of the protective plate 100 in which the layer structure is arranged in the order from top to bottom, including the upper skin 1, the detection layer 5, the impact-resistant layer 2, the buffer layer 3, and the lower skin 4, the impact process of the protective plate 100 when subjected to external impact is explained.

[0039] When the protective plate 100 is subjected to an external impact, the upper skin 1, as the first layer of structure, is first exposed to the external impact and blocks and disperses part of the impact energy. Afterwards, the remaining impact energy will be transmitted to the detection layer 5 below. The detection layer 5 includes a detection wire 511, which is used to detect the damage of the protective plate after the impact. When the impact causes the protective plate to deform, the detection wire 511 will be stretched. Then, the impact energy is transmitted to the anti-impact layer 2 below through the detection layer 5. The anti-impact layer 2 continues to disperse and absorb the impact energy, and then transmits the remaining energy to the buffer layer 3 below. When the impact energy is transmitted to the buffer layer 3, the buffer material of the buffer layer 3 uses its unique energy absorption characteristics to absorb the impact energy, thereby reducing the damage to the overall structure of the protective plate 100 caused by the impact energy.

[0040] Although the buffer layer 3 reduces the damage to the overall structure of the protective plate by the impact energy by its energy absorption characteristics, when the impact energy transmitted to the buffer layer 3 is greater than or equal to the impact of the preset impact energy threshold, the buffer layer 3 will still undergo local deformation, and this local deformation will form an obvious impact pit on the surface area of ​​the protective plate 100. Since the detection wire 511 has a constant length and is fixed on the protective plate 100, the detection wire 511 in the detection layer 5 above it will be stretched as the buffer layer 3 is locally deformed and the impact pit is formed. When the impact energy transmitted to the buffer layer 3 is greater than or equal to the impact of the preset impact energy threshold, the force of the stretching of the detection wire 511 exceeds the toughness limit of the detection wire 511, and the detection wire 511 will be torn off.

[0041] It should be noted that when the sorting order of the layer structure of the protective plate is the other two sorting orders, the impact process when the protective plate 100 is subjected to external impact is similar to the impact process corresponding to the sorting order of the layer structure of the above-mentioned protective plate 100, and will not be repeated here.

[0042] In a specific example, the impact-resistant layer 2 can be a high-strength steel plate, and the impact-resistant layer 2 has good rigidity and strength. When the impact-resistant layer 2 is combined with the buffer layer 3, the buffer layer 3 increases the strain of the impact-resistant layer 2 at the impact site, thereby increasing the energy absorbed by the impact-resistant layer 2. The impact-resistant layer 2 makes the edges of the internal structure of the buffer layer 3 more uniform when the buffer layer 3 is impacted, thereby increasing the compressive strength of the buffer layer 3, and thereby also increasing the energy absorption capacity of the buffer layer 3. When the protective plate 100 is subjected to impact energy, the impact-resistant layer 2 can disperse and absorb part of the impact energy, reducing the impact of the external impact on the buffer layer 3. The impact-resistant layer 2 has good rigidity and strength, thereby providing a strong support for the buffer layer 3. The impact-resistant layer 2 provides a more stable support structure for the buffer layer 3 by being closely combined with the buffer layer 3, which helps to maintain the shape and distribution density of the buffer holes 31 opened on the buffer layer 3, thereby ensuring that the buffer layer can play a more stable and efficient buffering effect when subjected to external impact, thereby reducing the damage to the protective plate 100 caused by external impact.

[0043] Illustratively, the protective plate provided in the embodiment of the present application can withstand impact energy ranging from 100J to 1000J.

[0044] It should be noted that the stacking method of the buffer layer 3 and the detection layer 5 can be selected according to specific needs to achieve a better buffer protection effect.

[0045] It should be noted that, in the second stacking setting mode, although the impact energy received by the buffer layer 3 passes through one more detection layer 5 than that in the first stacking setting mode, since the energy absorption of the detection layer 5 is very small and almost negligible, when the impact energy is greater than or equal to the preset impact energy threshold, the buffer layer 3 can still be deformed, thereby breaking the detection wire 511, so as to timely and accurately detect whether the protective plate 100 has been damaged by foreign object impact, and then trigger the signal analysis and processing unit 513 in the detection circuit 51 connected to the detection wire 511 to send an alarm signal, thereby improving the damage detection sensitivity of the protective plate when it is subjected to high-energy impact, so as to remind the user to repair or replace the protective plate 100.

[0046] In one embodiment of the present application, the protective plate 100 includes a plurality of detection layers 5 , and each detection layer 5 is disposed between any two adjacent layers of the upper skin 1 , the impact-resistant layer 2 , the buffer layer 3 and the lower skin 4 .

[0047] In a specific example, in order to enhance the detection capability of the detection layer 5 for the impact damage suffered by the protective plate 100, a plurality of detection layers 5 are provided in the protective plate 100, and each detection layer 5 is provided between any two adjacent layers of the upper skin 1, the impact layer 2, the buffer layer 3 and the lower skin 4, so as to ensure that the external impact can be sensed at different structural layers of the protective plate. For example, a detection layer 5 can be provided between the upper skin 1 and the impact layer 2 for preliminary detection of the initial stage of the impact; another detection layer 5 can be provided between the impact layer 2 and the buffer layer 3 to detect the dispersion and absorption of the impact energy in the impact layer 2; finally, another detection layer 5 can be provided between the buffer layer 3 and the lower skin 4 to evaluate the final impact of the impact on the overall structure of the protective plate 100.

[0048] It should be noted that the specific number of detection layers 5 can be determined according to the actual application requirements of the protective plate 100, and this application does not impose any limitation on this.

[0049] The choice of buffer material for the buffer layer 3 affects the overall performance and effect of the protective plate 100. Different buffer materials exhibit different static pressure strength ranges due to their fixed physical properties, such as elasticity, rigidity, ductility, etc., and thus exhibit different deformation and impact energy absorption capabilities when subjected to external impact.

[0050] Exemplarily, the buffer material may be a polymer material or a metal material, etc. When selecting the buffer material of the buffer layer 3 , it may be selected according to the specific requirements and usage scenarios of the protective plate 100 .

[0051] In one embodiment of the present application, the buffer layer is a buffer layer made of aluminum, stainless steel or polypropylene.

[0052] When the buffer material is a polymer material and the buffer layer is a buffer layer made of polypropylene, polymer materials such as polypropylene have good elasticity and ductility. When the protective plate 100 is subjected to external impact, the impact energy can be more widely dispersed to the entire surface of the protective plate 100, rather than being limited to a local area. Therefore, the concave deformation caused by the impact is relatively gentle, and the impact pit is shallow. Since the impact energy is widely dispersed, the direct impact of the external impact on the detection wire 511 is relatively small, which makes the detection wire 511 more difficult to tear off. Therefore, compared with metal materials, polymer materials require greater impact energy to tear off the detection circuit 511.

[0053] When the buffer material is a metal material, the metal material has higher rigidity and strength. When the protective plate 100 is subjected to external impact, the metal material can bear the impact energy more concentratedly, so that the area affected by the impact appears as an impact pit. Due to the high strength of the metal material, the impact energy is not easy to spread to other areas, so there is almost no obvious concave deformation near the impact pit. At this time, the impact pit produced by the impact will be deeper and the opening width will be smaller. Since the impact energy is concentrated, the direct impact of the impact on the detection wire 511 is greater, making the detection wire 511 easier to break. At this time, compared with plastic materials and polymer materials, metal materials require less impact energy to break the detection wire 511.

[0054] It should be noted that, according to different requirements, designers can select buffer materials with different static pressure strength ranges to achieve the desired effect. For example, for applications of the protective plate 100 that require a larger static pressure strength range and higher impact absorption capacity, a metal material with a larger static pressure strength range is selected as the buffer layer 3; and for some applications of the protective plate 100 that do not require a high static pressure strength range but require lightness and flexibility, a plastic or polymer material is selected as the buffer layer 3.

[0055] In one embodiment of the present application, the detection circuit 51 includes a power supply unit, a signal acquisition unit and a signal analysis and processing unit 513, wherein the signal acquisition unit is arranged by a detection wire 511, a first end (V-) of the power supply unit is connected to a first end of the signal acquisition unit, a second end of the signal acquisition unit is connected to a first end of the signal analysis and processing unit 513, and a second end of the signal analysis and processing unit 513 is connected to a second end of the power supply unit (V+);

[0056] When the protective plate is subjected to an impact greater than or equal to a preset impact energy threshold, the signal acquisition unit collects a signal indicating that the detection wire 511 is broken, and sends the signal indicating that the detection wire 511 is broken to the signal analysis and processing unit 513. The signal analysis and processing unit 513 outputs an alarm signal after receiving the signal indicating that the detection wire 511 is broken.

[0057] Specifically, in addition to the detection wire 511, the detection circuit 51 also includes a power supply unit, a signal acquisition unit, a current limiting protection resistor 512 and a signal analysis and processing unit 513. Among them, the power supply unit is used to provide power for the detection circuit 51. The signal acquisition unit is arranged by the detection wire 511. The current limiting protection resistor 512 and the signal analysis and processing unit 513 are integrated at the edge of the protective plate 100. The current limiting protection resistor 512 is used to limit the magnitude of the current in the detection circuit 51 to protect the detection circuit 51 from abnormal conditions such as overload and short circuit. The signal analysis and processing unit 513 is used to process the signal from the detection wire 511 and judge the impact condition of the protective plate 100 according to the change of the signal. When the detection wire 511 is broken by the high-energy impact, the resistance or conductivity of the detection wire 511 will change, and these changes will be converted into electrical signals and transmitted to the signal analysis and processing unit 513. The signal analysis and processing unit 513 can accurately determine whether the protective plate 100 has been subjected to an impact greater than or equal to a preset impact energy threshold by analyzing the electrical signal. When the signal analysis and processing unit 513 determines that the protective plate 100 has been subjected to an impact greater than or equal to the preset impact energy threshold, the detection wire 511 is immediately cut off, and a signal indicating that the detection wire 511 has been cut off is collected through the signal acquisition unit, and the signal indicating that the detection wire 511 has been cut off is sent to the signal analysis and processing unit 513. After receiving the signal indicating that the detection wire 511 has been cut off, the signal analysis and processing unit 513 outputs an alarm signal to remind the user to repair or replace the protective plate 100.

[0058] It should be noted that if the detection wire 511 itself carries a certain resistance, and this resistance can protect the detection circuit 51 from abnormal conditions such as overload and short circuit, the current limiting protection resistor 512 can be omitted in the detection circuit 51. Whether there is a current limiting protection resistor 512 in the detection circuit 51 is not limited here.

[0059] In a specific example, the detection circuit 51 includes detection wires 511 , and the detection wires 511 are arranged in a specific manner to cover the entire surface area of ​​the protection plate 100 , and the arrangement spacing of the detection wires is controlled to be 3 mm to 50 mm.

[0060] In one embodiment of the present application, the detection wire includes a plurality of straight line segments, and the plurality of straight line segments are arranged side by side or in a grid shape, or the detection wire includes a plurality of straight line segments and a plurality of connecting segments, and the plurality of straight line segments are arranged side by side, and the straight line segments and the connecting segments are alternately connected in sequence, and the spacing between two adjacent side-by-side straight line segments is 3 mm to 50 mm.

[0061] There are many specific arrangements of the detection wire 511. For example, in one example, the detection wire 511 includes multiple straight segments and multiple connecting segments, wherein the multiple straight segments are arranged side by side, and the straight segments and the connecting segments are alternately connected in sequence to form a whole "S"-shaped ring structure, and two adjacent straight segments are parallel and spaced apart, and the distance between two adjacent straight segments is, for example, 2mm to 10mm. This wiring method and spacing ensure that when each part of the protective plate 100 is deformed by an external impact greater than or equal to a preset impact energy threshold, it can be ensured that there is a part of the straight segment or the connecting segment located in the deformation area, and it is broken due to the deformation of the buffer layer 3. The "S"-shaped ring structure arrangement of the detection wire 511 is as follows: Figure 2 As shown, a detection wire 511 is arranged in an "S"-shaped ring structure on the entire surface area of ​​the protective plate 100. At this time, the detection circuit 51 is composed of a detection wire 511 arranged in an "S"-shaped ring structure, a current limiting protection resistor 512 and a signal analysis and processing unit 513.

[0062] In another example, the detection wire 511 includes a plurality of straight segments, wherein the plurality of straight segments are arranged side by side to form a straight parallel structure. Alternatively, the plurality of straight segments are arranged in a grid-like manner to form a horizontal and vertical grid-like structure. Figure 3 As shown, multiple detection wires 511 are horizontally arranged on the entire surface area of ​​the protective plate 100. At this time, the detection circuit 51 is composed of multiple independent horizontally arranged detection wires 511, multiple current limiting protection resistors 512 and a signal analysis and processing unit 513. The spacing between each detection wire 511 is, for example, 2mm to 10mm, and each detection wire 511 is individually connected in series with a current limiting protection resistor 512, and finally connected to the signal analysis and processing unit 513. When any detection wire 511 is broken, it means that the protective plate 100 has been subjected to impact damage that affects its protective performance.

[0063] In one embodiment of the present application, the detection wire is at least one of a metal etching wire, an enameled wire, and a carbon fiber wire.

[0064] The detection wire 511 may be made of a variety of materials. For example, the detection wire 511 may be a metal wire such as enameled copper wire using polyimide (PI) as an insulation layer, or a metal wire such as an oxygen-free copper wire formed by etching.

[0065] It should be noted that the embodiment of the present application does not limit the selection of the specific arrangement form of the detection wire 511. The embodiment of the present application does not limit the selection of the material of the detection wire 511. The specific arrangement form of the detection wire 511 and the material of the detection wire 511 can be selected according to actual conditions.

[0066] In one embodiment of the present application, an insulating material is used to insulate the detection wire 511 from the protective plate 100, and the insulating material is a film or an insulating layer on the outer wall of the detection wire. The insulating material is used to ensure the insulation between the detection wire 511 and the protective plate 100 to prevent electrical contact or other accidents.

[0067] In addition, the layers of the protective plate 100 are bonded together by hot melt adhesive film to ensure the structural stability and overall performance of the protective plate 100. This bonding method can make the layers tightly bonded to prevent them from loosening or peeling during use. In addition, the hot melt adhesive film can also provide an additional insulation layer to help prevent electrical failures or accidents.

[0068] In one embodiment of the present application, the preset impact energy threshold is adjusted according to the static pressure strength of the buffer layer. Specifically, when the static pressure strength of the buffer layer is higher, the preset impact energy threshold is lower. This setting can ensure that the protective plate 100 can trigger the protection measures more effectively when it is subjected to a high-energy impact, that is, when the protective plate is subjected to an impact greater than or equal to the preset impact energy threshold, the impact pit formed by the impact immediately breaks the detection wire 511, so that the signal analysis and processing unit 513 quickly sends out an alarm signal.

[0069] In one embodiment of the present application, the buffer layer 3 is provided with a plurality of buffer holes 31 spaced apart from each other, and the buffer holes 31 penetrate the buffer layer 3 in the thickness direction.

[0070] Among them, the metal material is usually selected from metal materials with good elasticity and energy absorption characteristics, such as steel, aluminum, or titanium alloy, nickel-based alloy, etc., which helps to ensure that the buffer layer 3 can exert better energy absorption and buffering effects when impacted.

[0071] In a specific example, the buffer layer 3 is made of aluminum material, and the buffer layer 3 is provided with a plurality of buffer holes 31 spaced apart from each other. Figure 4 The figure shows the overall structure of the honeycomb structure. The direction of the buffer hole 31 is the plate surface direction of the buffer layer 3, and the depth of the buffer hole 31 is the thickness of the buffer layer 3. A plurality of buffer holes 31 spaced apart form a honeycomb structure of the buffer layer 3. The preparation process of the honeycomb structure is to bond each two of the plurality of metal corrugated sheets to each other in a manner of facing each other in the shape of the honeycomb structure, thereby forming a honeycomb with a hollow structure, wherein the metal corrugated sheet can be a corrugated sheet, and the thickness of the corrugated sheet ranges from 0.02 mm to 0.50 mm.

[0072] Specifically, the honeycomb structure is composed of multiple metal corrugated sheets symmetrically arranged around a preset plane, wherein every two metal corrugated sheets protrude in directions away from each other, so that a honeycomb-shaped buffer space is formed on the surfaces of every two metal corrugated sheets that are close to each other. This method can form a hollow structure similar to a honeycomb between the two metal corrugated sheets, thereby increasing the buffering performance of the buffer layer 3.

[0073] It should be noted that the size, shape and distribution density of the buffer holes 31 will affect the overall strength, stiffness and buffering performance of the buffer layer, and further affect the static pressure strength range of the buffer layer.

[0074] Specifically, the size of the buffer hole 31 affects the overall strength and stiffness of the buffer layer. Among them, smaller buffer holes 31 can provide a denser support structure, thereby increasing the overall strength and stiffness of the buffer layer 3. However, too small buffer holes 31 will also cause the material to be too dense, resulting in worse buffering performance. On the contrary, although larger buffer holes 31 can provide better buffering performance, they may reduce the overall strength and stiffness of the buffer layer.

[0075] The shape of the buffer hole 31 affects the compressive performance of the buffer layer. Common shapes of the buffer hole 31 include circular, regular hexagonal, etc. When the buffer holes 31 of different shapes are subjected to the pressure generated by external impact, their stress distribution and energy absorption methods will be different. For example, the regular hexagonal buffer hole 31 can provide a more uniform stress distribution, thereby improving the compressive performance of the buffer layer.

[0076] The distribution density of the buffer holes 31 affects the stability and compression resistance of the buffer layer. A denser distribution of the buffer holes 31 can provide more support points, thereby increasing the stability and compression resistance of the buffer layer. However, too high a distribution density may lead to excessive use of materials, increasing the manufacturing cost and weight of the protective plate 100. On the contrary, a sparser distribution of the buffer holes 31 may lead to a lack of sufficient support in certain areas of the buffer layer, reducing the stability and compression resistance of the buffer layer.

[0077] It should be noted that designers can design the size, shape and distribution density of the buffer holes 31 according to the static pressure strength range of the buffer layer in the embodiment of the present application, which is 1 MPa to 50 MPa. The specific design of the size, shape and distribution density of the buffer holes 31 is not limited here.

[0078] In one embodiment of the present application, the detection layer 5 is disposed between the upper skin 1 and the impact-resistant layer 2 .

[0079] Specifically, since the impact-resistant layer 2 is used to provide strong support for the protective plate 100 and to block and disperse impact energy, the impact-resistant layer 2 must be located above the buffer layer 3. Without considering the detection layer 5, the layer structure of the protective plate 100 includes, from top to bottom, an upper skin 1, an impact-resistant layer 2, a buffer layer 3, and a lower skin 4. When the detection layer 5 is added to the protective plate 100 and the detection layer 5 is arranged between the upper skin 1 and the impact-resistant layer 2, since the impact-resistant layer 2 can only be located above the buffer layer 3, the detection layer 5 will also be located above the buffer layer 3. At this time, the layer structure of the protective plate 100 includes, from top to bottom, an upper skin 1, a detection layer 5, an impact-resistant layer 2, a buffer layer 3, and a lower skin 4.

[0080] The embodiment of the present application can quickly detect the situation where the protective plate 100 is subjected to external impact by arranging the detection layer 5 between the upper skin 1 and the impact-resistant layer 2; the impact-resistant layer 2 provides strong support for the overall structure of the protective plate 100, and the high strength and rigidity of the impact-resistant layer 2 can effectively block and disperse the impact energy; by adopting a honeycomb structure for the buffer layer 3, the impact energy can be evenly transmitted along the edges of the honeycomb structure; through the mutual cooperation between the impact-resistant layer 2 and the buffer layer 3, the compressive resistance and static pressure strength of the buffer layer can be improved, thereby improving the compressive resistance and static pressure strength of the protective plate 100.

[0081] In one embodiment of the present application, the buffer hole 31 extends from the upper skin 1 to the lower skin 4 and passes through the buffer layer 3 .

[0082] In a specific example, if Figure 5 As shown, the shape of the buffer hole 31 is a regular hexagon, the opening direction of the buffer hole 31 is perpendicular to the board surface direction of the buffer layer 3, and the buffer hole 31 penetrates the buffer layer 3 in the board surface direction of the buffer layer, that is, the buffer hole 31 penetrates the entire board surface of the buffer layer 3 along the hole depth direction. At this time, the structure of the buffer layer 3 is a double-layer corrugated structure. The static pressure strength of the buffer layer 3 with a double-layer corrugated structure is lower than the static pressure strength of the buffer layer 3 with a honeycomb structure.

[0083] In one embodiment of the present application, the buffer layer 3 includes a plurality of corrugated boards stacked in the thickness direction, the corrugated boards are bent in a tooth shape, and two adjacent corrugated boards are jointly arranged to form a plurality of buffer holes 31 spaced apart from each other.

[0084] In a specific example, the buffer layer 3 includes two corrugated boards stacked in the thickness direction, and the corrugated boards are serrated, wherein the thickness direction is the direction from the upper skin 1 to the lower skin 4. At this time, the structure of the buffer layer 3 is a multi-layer (double or more) corrugated structure, and the two adjacent corrugated boards are jointly surrounded to form a plurality of buffer holes 31 spaced apart. The static pressure strength of the buffer layer 3 of the multi-layer corrugated structure is higher than the static pressure strength of the buffer layer 3 of the double-layer corrugated structure. In other embodiments, three or more corrugated boards may also be stacked, which is not limited here.

[0085] In one embodiment of the present application, the buffer layer 3 further includes at least one horizontal reinforcing plate disposed between two adjacent corrugated boards, and the corrugated boards and the horizontal reinforcing plates connected to the corrugated boards are jointly arranged to form a plurality of buffer holes 31 spaced apart from each other.

[0086] In a specific example, for the buffer layer 3 of the corrugated structure, since the hole depth of the buffer hole 31 is deeper, when the external impact impacts the impact protection plate 100, the buffer layer 3 of the corrugated structure is more likely to deform than the buffer layer 3 of the honeycomb structure, that is, the compressive performance and static pressure strength of the buffer layer 3 of the corrugated structure are less than the compressive performance and static pressure strength of the buffer layer 3 of the honeycomb structure. Therefore, in order to improve the compressive performance and static pressure strength of the buffer layer 3 of the corrugated structure, it can be considered to add a horizontal reinforcement plate in the honeycomb structure to improve the compressive performance and static pressure strength of the buffer layer 3.

[0087] The number of horizontal reinforcing plates can be designed to be one or more. When the number of horizontal reinforcing plates is one, such as Figure 6 As shown, the horizontal reinforcing plate is placed horizontally in the middle of the single-layer corrugated board to form a honeycomb-like structure.

[0088] When there are multiple horizontal reinforcing plates, a honeycomb-like structure can be designed in different ways. One design method is to sandwich the horizontal reinforcing plate between two layers of corrugated board, and repeat this structure to form a multi-layer composite structure similar to a honeycomb. Another design method is to place the horizontal reinforcing plate directly on a single layer of corrugated board, and repeat this structure to form a honeycomb-like structure.

[0089] In one embodiment of the present application, the buffer layer further includes a functional material filled in the buffer hole 31 .

[0090] In a specific example, for the buffer layer 3, the honeycomb structure also has a certain gap, that is, the height of the honeycomb core, which may cause the honeycomb structure to be more easily deformed. In order to further improve the compressive performance and static pressure strength of the buffer layer 3 of the honeycomb structure, functional materials can be filled in the buffer holes 31 of the honeycomb structure to improve the compressive performance and static pressure strength of the buffer layer 3 of the honeycomb structure. Figure 7 As shown, filling the buffer holes 31 of the honeycomb structure with non-Newtonian fluid or resin glue can improve the overall compression resistance and static pressure strength of the honeycomb structure.

[0091] The embodiments of the present application can better focus the impact force on the impact area by adding horizontal reinforcement sheets to the buffer layer 3 of the corrugated structure, or selecting a buffer layer 3 of a honeycomb structure with higher static pressure strength, or filling functional materials in the buffer holes 31 of the buffer structure, thereby improving the detection sensitivity of the protective plate 100 under pressure.

[0092] The compressive performance and static pressure strength of the protective plate 100 are described below through Examples 1 to 6.

[0093] Example 1

[0094] like Figure 1 As shown, the layer structure of the protective plate 100 includes an upper skin 1, a detection layer 5, an impact-resistant layer 2, an aluminum honeycomb buffer layer 3 and a lower skin 4 from top to bottom, wherein the buffer hole 31 of the aluminum honeycomb buffer layer 3 is in the shape of a regular hexagon, and the wall thickness of the buffer hole 31 is 0.18 mm.

[0095] Example 2

[0096] like Figure 1 As shown, the layer structure of the protective plate 100 includes an upper skin 1, a detection layer 5, an impact-resistant layer 2, an aluminum honeycomb buffer layer 3 and a lower skin 4 from top to bottom, wherein the buffer hole 31 of the aluminum honeycomb buffer layer 3 is in the shape of a regular hexagon, and the wall thickness of the buffer hole 31 is 0.21 mm.

[0097] Example 3

[0098] like Figure 5 As shown, the layer structure of the protective plate 100 includes an upper skin 1, a detection layer 5, an impact-resistant layer 2, a corrugated board buffer layer 3 and a lower skin 4 from top to bottom, wherein the corrugated sheet wall thickness of the corrugated board buffer layer 3 is 0.18 mm.

[0099] Example 4

[0100] like Figure 5 As shown, the layer structure of the protective plate 100 includes an upper skin 1, a detection layer 5, an impact-resistant layer 2, a corrugated board buffer layer 3 and a lower skin 4 from top to bottom, wherein the corrugated sheet wall thickness of the corrugated board buffer layer 3 is 0.21 mm.

[0101] Example 5

[0102] like Figure 6 As shown, the layer structure of the protective plate 100 includes, from top to bottom, an upper skin 1, a detection layer 5, an impact-resistant layer 2, a corrugated board buffer layer 3 containing an aluminum foil flat reinforcement sheet, and a lower skin 4, wherein the wall thickness of the corrugated sheet is 0.21 mm.

[0103] Example 6

[0104] The layer structure of the protective plate 100 includes an upper skin 1, a detection layer 5, an impact-resistant layer 2, a plastic PP honeycomb buffer layer 3 and a lower skin 4 from top to bottom. The shape of the buffer hole 31 of the plastic PP honeycomb buffer layer 3 is approximately hexagonal, and the thickness of the buffer hole 31 is 0.21 mm.

[0105] After a large number of experimental verifications by the applicant, the experimental data in the following table were obtained.

[0106]

[0107]

[0108] It should be noted that, when the compressive resistance of the buffer layer is better and the static pressure strength is higher, the energy threshold for triggering the early warning is lower, that is, it is easier for the signal analysis and processing unit 513 to output an alarm signal.

[0109] Through comparison of Examples 1 to 6, it is found that the static pressure strength of the protective plate of Example 2 is greater than the static pressure strength of the protective plate of Example 1, the static pressure strength of the protective plate of Example 5, the static pressure strength of the protective plate of Example 4, the static pressure strength of the protective plate of Example 3, and the static pressure strength of the protective plate of Example 6.

[0110] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions 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. A protective plate, characterized in that: It comprises an upper skin, a detection assembly and a lower skin which are stacked in sequence, the detection assembly comprises an anti-impact layer, a buffer layer and a detection layer; the anti-impact layer is located above the buffer layer, the detection layer, the anti-impact layer and the buffer layer are stacked, the detection layer comprises a detection circuit, the detection circuit comprises a detection wire, when the protective plate is impacted, the increase in the static pressure strength of the buffer layer increases the strain of the anti-impact layer at the impacted location, so that the impact crater formed by the impact breaks the detection wire, after the detection wire is broken, the detection circuit outputs an alarm signal, wherein the static pressure strength range of the buffer layer is 1MPa to 50MPa.

2. The protective plate according to claim 1, characterized in that: The buffer layer is provided with a plurality of buffer holes spaced apart from each other, and the buffer holes penetrate the buffer layer in the thickness direction, wherein the plurality of buffer holes spaced apart from each other form a honeycomb structure of the buffer layer; the honeycomb structure is composed of a plurality of metal corrugated sheets symmetrically arranged around a preset plane, and every two metal corrugated sheets protrude in directions away from each other, so that a honeycomb-shaped buffer space is formed on the surfaces of every two metal corrugated sheets close to each other.

3. The protective plate according to claim 1, characterized in that: The detection layer is arranged between the upper skin and the anti-impact layer.

4. The protective plate according to claim 1, characterized in that: The detection circuit comprises a power supply unit, a signal acquisition unit and a signal analysis and processing unit, wherein the signal acquisition unit is formed by arranging the detection wires, a first end of the power supply unit is connected to a first end of the signal acquisition unit, a second end of the signal acquisition unit is connected to a first end of the signal analysis and processing unit, and a second end of the signal analysis and processing unit is connected to a second end of the power supply unit; When the protective plate is subjected to an impact greater than or equal to a preset impact energy threshold, the signal acquisition unit collects a signal that the detection wire is broken, and sends the signal that the detection wire is broken to the signal analysis and processing unit. The signal analysis and processing unit outputs an alarm signal after receiving the signal that the detection wire is broken.

5. The protective plate according to claim 1, characterized in that: The detection wire is at least one of a metal etching wire, an enameled wire and a carbon fiber wire.

6. The protective plate according to claim 1, characterized in that: The detection wire includes a plurality of straight segments, and the plurality of straight segments are arranged side by side or in a grid shape, or the detection wire includes a plurality of straight segments and a plurality of connecting segments, and the plurality of straight segments are arranged side by side, and the straight segments and the connecting segments are alternately connected in sequence, and the spacing between two adjacent side-by-side straight segments is 3 mm to 50 mm.

7. The protective plate according to any one of claims 1 to 6, characterized in that: The buffer layer is made of aluminum, stainless steel or polypropylene.

8. The protective plate according to claim 2, characterized in that: The buffer layer further includes a functional material filled in the buffer hole.

9. The protective plate according to claim 1, characterized in that: The detection 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 detection wire.

10. The protective plate according to claim 1, characterized in that: The protective plate includes a plurality of detection layers, and each detection layer is arranged between any two adjacent layers of the upper skin, the anti-impact layer, the buffer layer and the lower skin.

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