Fabric-based two-dimensional flexible stress-sensitive element, flexible two-dimensional pressure sensor and smart home products

Abstract

This invention belongs to the field of force sensors, specifically relating to a fabric-type two-dimensional flexible stress-sensitive element, a flexible two-dimensional pressure sensor, and smart home products. The fabric-type two-dimensional flexible stress-sensitive element includes a sheet-like bottom structure and a top structure, as well as an encapsulation structure. The bottom structure consists of a conductive fabric layer and an elastic filler layer above it. The top structure is an elastic structure capable of lateral deformation and recovery, and is a sandwich structure composed of a dielectric fabric layer, a flexible insulating layer, and a lateral resistive layer. The conductive fabric layer, the elastic filler layer, and the dielectric fabric layer constitute a contact-separated triboelectric nanogenerator to achieve longitudinal stress detection using the principles of contact electrification and electrostatic induction; the lateral resistive layer constitutes a variable resistor to achieve lateral stress detection. This invention solves the problems of rigid components and limited functionality in pressure sensors used in smart home products, and can improve the user experience of smart home products.

Description

Technical Field

[0001] This utility model belongs to the field of force sensors, specifically relating to a fabric-type two-dimensional flexible stress-sensitive element, a flexible two-dimensional pressure sensor, and smart home products. Background Technology

[0002] Good sleep quality is crucial for maintaining health and promoting functional recovery. The non-invasive monitoring of sleep quality using sleep monitoring pillows has gained widespread attention in recent years. Currently, most smart sleep monitoring pillows on the market focus on ergonomic design, heat therapy and massage, height adjustment via airbags to improve sleep comfort, or integration with smart home devices to release fragrances or play music to aid sleep. Existing smart home products often integrate pressure sensors, gyroscopes, etc., to monitor user activity or detect snoring via built-in microphones. However, existing sensors or signal acquisition components are generally rigid and have limited accuracy, resulting in a poor user experience. Summary of the Invention

[0003] To address the issues of rigid components and limited functionality in pressure sensors used in smart home products, this invention provides a fabric-type two-dimensional flexible stress-sensitive element, a flexible two-dimensional pressure sensor, and smart home products.

[0004] The technical solution provided by this utility model is as follows: A fabric-based two-dimensional flexible stress-sensitive element includes a sheet-like bottom structure and a top structure, as well as an encapsulation structure that allows the two to separate longitudinally and restricts their lateral displacement. The bottom structure consists of a conductive fabric layer and an elastic filler layer above it. The conductive fabric layer is a sheet-like material woven from conductive fibers; the elastic filler layer is made of an elastomer and its upper surface includes several raised structures.

[0005] The top structure is an elastic structure capable of lateral deformation and recovery, covering the bottom structure. The top structure is a sandwich structure consisting of a dielectric fabric layer, a flexible insulating layer, and a lateral resistive layer, with the dielectric fabric layer located near the bottom structure. The dielectric fabric layer is made of a sheet material woven from dielectric fibers, which are made of a material with a different electronegativity than the elastic filler layer. The lateral resistive layer includes electrodes on both sides and a conductive elastic layer in the middle; the flexible insulating layer is used to fix and electrically isolate the dielectric fabric layer and the lateral resistive layer from each other.

[0006] In this fabric-based two-dimensional flexible stress-sensitive element, a conductive fabric layer, an elastic filler layer, and a dielectric fabric layer constitute a contact-separated triboelectric nanogenerator. The magnitude of the longitudinal stress is characterized by the electrical signal output between the conductive and dielectric fabric layers. The magnitude of the lateral stress is characterized by the resistance value between the two electrodes when the lateral resistive layer deforms.

[0007] As a further improvement of this utility model, the raised structure on the surface of the elastic filling layer adopts corrugated raised structures, or adopts dot-matrix distributed conical, columnar, or granular raised structures.

[0008] As a further improvement of this utility model, the encapsulation structure employs an insulating covering layer that encapsulates the bottom and top structures. Alternatively, an outer edge made of insulating material is provided on the outer periphery of the top and bottom structures, and the outer edges of the top and bottom structures are fixedly connected to form the encapsulation structure.

[0009] As a further improvement of this invention, the electrodes in the transverse resistive layer are fabric electrodes.

[0010] As a further improvement of this invention, the conductive elastic layer is made of latex material doped with carbon nanotubes.

[0011] As a further improvement of this utility model, the elastomeric material of the elastic filling layer is SBS elastomer, SEBS elastomer, TPU elastomer, EVA elastomer, EPDM elastomer, CPE elastomer, PVC elastomer or silicone.

[0012] As a further improvement of this utility model, the flexible insulating layer is made of a flexible polymer film.

[0013] As a further improvement of this utility model, the conductive fibers in the conductive fabric layer are made of metal fibers or composite fibers with metal coatings on the surface.

[0014] As a further improvement of this utility model, the dielectric fiber of the dielectric fabric layer is any one of FEP, PTFE, PVDF, PFA, ETFE, and FFKM.

[0015] As a further improvement of this utility model, the layers in the bottom structure or top structure are fixed together by adhesive bonding or sewing.

[0016] This utility model also includes a flexible two-dimensional pressure sensor, which includes: a sensing film, an energy management circuit, a driving circuit, a signal acquisition circuit, and a signal processing circuit.

[0017] The sensing film is composed of at least one of the aforementioned fabric-type two-dimensional flexible stress-sensitive elements arranged in an array. The conductive fabric layer in each fabric-type two-dimensional flexible stress-sensitive element constitutes a first port; the electrodes on both sides of the transverse resistive layer in each fabric-type two-dimensional flexible stress-sensitive element constitute a second port.

[0018] An energy management circuit is electrically connected to the first port and collects electrical energy from the contact-separated triboelectric nanogenerator through the first port. A drive circuit is electrically connected to the energy management circuit and the second port. The drive circuit is powered by the energy management circuit and outputs a drive signal to the second port for measuring transverse stress, as well as a second electrical signal characterizing the transverse stress. A signal acquisition circuit is electrically connected to the first port and the drive circuit. The signal acquisition circuit acquires the output of the first port and uses it as a first electrical signal characterizing the longitudinal stress; and acquires the second electrical signal output by the drive circuit.

[0019] The signal processing module amplifies, filters, and performs analog-to-digital conversion on the first and second electrical signals, and then generates the corresponding longitudinal and transverse stress measurement results according to a pre-calibrated mapping table.

[0020] As a further improvement of this invention, the energy management circuit, drive circuit, and signal acquisition circuit are flexible circuits integrated onto a fabric-type two-dimensional flexible stress-sensitive element. Alternatively, the energy management circuit, drive circuit, and signal acquisition circuit are external circuits and electrically connected to each fabric-type two-dimensional flexible stress-sensitive element in the sensing film.

[0021] As a further improvement of this utility model, the energy management circuit, drive circuit, signal acquisition circuit and fabric-type two-dimensional flexible stress-sensitive element are electrically connected by welding, hot pressing and conductive adhesive bonding.

[0022] This utility model also includes a smart home product, which includes a body and a flexible two-dimensional pressure sensor as described above, embedded in the body; the body includes a mattress, pillow or sofa.

[0023] The technical solution provided by this utility model has the following beneficial effects: This invention designs a novel fabric-type two-dimensional flexible stress-sensitive element based on the principles of flexible resistance and electrostatic induction, along with its corresponding flexible two-dimensional pressure sensor and smart home products. The flexible two-dimensional pressure sensor is made of flexible textile or polymer materials and can simultaneously detect both lateral and longitudinal stresses, resulting in superior performance. Utilizing the flexibility of the two-dimensional pressure sensor, its application in various household products enables seamless measurement of multidimensional stresses, significantly improving the user experience. Attached Figure Description

[0024] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1This is a schematic diagram of the structure of the fabric-type two-dimensional flexible stress-sensitive element provided in Embodiment 1 of this utility model.

[0025] Figure 2 A simplified TENG model for the longitudinal stress detection part of a fabric-type two-dimensional flexible stress-sensitive element.

[0026] Figure 3 This is a schematic diagram of the longitudinal stress detection principle based on TENG in Embodiment 1 of this utility model.

[0027] Figure 4 This is a resistance model for the transverse stress detection part of a fabric-type two-dimensional flexible stress-sensitive element.

[0028] Figure 5 This is a schematic diagram of the longitudinal stress detection principle based on the resistance model in Embodiment 1 of this utility model.

[0029] Figure 6 This is a circuit diagram of the flexible two-dimensional pressure sensor provided in Embodiment 2 of this utility model.

[0030] Figure 7 This is a schematic diagram of the structure of the smart pillow with an integrated flexible two-dimensional pressure sensor provided in Embodiment 3 of this utility model.

[0031] The diagram is marked as follows: 1. Bottom structure; 2. Top structure; 11. Conductive fabric layer; 12. Elastic filler layer; 21. Dielectric fabric layer; 22. Flexible insulating layer; 23. Lateral resistive layer; 231. Electrode; 232. Conductive elastic layer. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0033] In the description of this utility model, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "top," "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," "third," etc., are only used to distinguish different objects described, and should not be construed as indicating or implying relative importance.

[0034] Example 1 This embodiment provides a fabric-based two-dimensional flexible stress-sensitive element. This element is primarily made of flexible textile or polymer materials and can simultaneously sense both lateral and longitudinal stresses, resulting in superior performance. When sensors based on this element are designed and applied to home furnishings such as mattresses, pillows, and sofas, non-invasive multi-dimensional stress measurement can be achieved, significantly improving the user experience.

[0035] Specifically, such as Figure 1 As shown, the fabric-type two-dimensional flexible stress-sensitive element in this embodiment includes a bottom structure 1, a top structure 2, and an encapsulation structure (not shown in the figure). The shape and size of the bottom structure 1 and the top structure 2 are not limited in this embodiment. For example, the bottom structure 1 and the top structure can be sheet-like structures of the same size, including square sheets, circular sheets, or other sheets of arbitrary shapes. The encapsulation structure allows the bottom structure 1 and the top structure 2 to separate longitudinally and limits the lateral offset between them.

[0036] In practical applications, various encapsulation structures can be adopted to achieve the aforementioned encapsulation objectives. For example, the encapsulation structure can be constructed by covering the bottom structure 1 and the top structure 2 with an insulating covering layer. The insulating covering layer can be mesh-like or linear to achieve partial coverage, or a thin film can be used to fully cover the bottom structure 1 and the top structure 2. The full coverage method achieves both containment and waterproof / dustproof protection, making it a more optimized solution. Alternatively, an outer edge made of insulating material can be provided around the top structure 2 and the bottom structure 1, and the outer edges of the top structure 2 and the bottom structure 1 can be fixedly connected to form the desired encapsulation structure. Specifically, the fixing methods at the outer edges of the top structure 2 and the bottom structure 1 can include various forms such as thread sewing, adhesive bonding, and heat fusion.

[0037] The bottom structure 1 consists of a conductive fabric layer 11 and an elastic filling layer 12 above it. In practical applications, the conductive fabric layer 11 is a sheet material woven from conductive fibers. The conductive fibers in the conductive fabric layer 11 can be metal fibers, such as fibers made from metals or their alloys, such as silver, nickel, iron, and copper, or composite fibers with a metal coating on the surface. The substrate of the composite fiber can be natural fibers such as cotton, hemp, and silk, or various synthetic fibers such as polyester, acrylic, and spandex. The elastic filling layer 12 is made of an elastomer. In this embodiment, the elastomer material of the elastic filling layer 12 can be SBS elastomer, SEBS elastomer, TPU (polyurethane) elastomer, EVA (ethylene-vinyl acetate) elastomer, EPDM (ethylene propylene diene monomer) elastomer, CPE (fluorinated polyethylene) elastomer, PVC (polyvinyl chloride) elastomer, and silicone, as well as other common materials with high resilience.

[0038] Specifically, in this embodiment, the upper surface of the elastic filling layer 12 includes several protruding structures. These protruding structures allow the top structure 2 and the bottom structure 1 to have a certain gap in their natural state, preventing them from fitting tightly together. Under longitudinal pressure, the deformation of the protruding structures allows the top structure 2 and the bottom structure 1 to fit together fully. In practical applications, the protruding structures on the surface of the elastic filling layer 12 can be corrugated protrusions, or dot-matrix distributed cone-shaped, columnar, or granular protrusions, etc. The protruding structures are integrally formed with the main body of the elastic filling layer 12, and the height of the protruding structures can be flexibly set according to the required spacing between the top structure 2 and the bottom structure 1 in their natural state.

[0039] In this embodiment, the top structure 2 is an elastic structure capable of lateral deformation and recovery. Specifically, the top structure 2 covers the bottom structure 1. The top structure 2 is composed of a dielectric fabric layer 21, a flexible insulating layer 22, and a lateral resistive layer 23, forming a sandwich structure. The dielectric fabric layer 21 is located on the side closest to the bottom structure 1. The dielectric fabric layer 21 is made of a sheet material woven from dielectric fibers, wherein the dielectric fibers are made of a material with a different electronegativity than the elastic filling layer 12. In practical applications, the dielectric fibers in the dielectric fabric layer 21 can be various fluoropolymers such as FEP (perfluoroethylene propylene), PTFE (polytetrafluoroethylene), PVDF (polyvinylidene fluoride), PFA (meltable polytetrafluoroethylene), ETFE (ethylene-tetrafluoroethylene copolymer), and FFKM (fluororubber).

[0040] The lateral resistive layer 23 includes electrodes 231 on both sides and a conductive elastic layer 232 in the middle. In this embodiment, to make the top structure 2 formed by the multilayer composite flexible and laterally elastic, the electrodes 231 in the lateral resistive layer 23 can be made of various fabric electrodes 231. The conductive elastic layer 232 can be made of latex material doped with carbon nanotubes or other conductive particles. The flexible insulating layer 22, as the interlayer between the lateral resistive layer 23 and the dielectric fabric layer 21, should also be made of a flexible and elastic material, and has two main functions: to fix the dielectric fabric layer 21 and the lateral resistive layer 23 to each other, and to isolate the dielectric fabric layer 21 and the lateral resistive layer 23 to achieve insulation. Based on the above performance requirements, in practical applications, the flexible insulating layer 22 can be made of flexible polymer films, such as films made of polyethylene, polypropylene, polyvinyl chloride, etc.

[0041] Both the bottom structure 1 and the top structure 2 are multi-layer composite materials. In practical applications, the layers in the bottom structure 1 or the top structure 2 can be fixed by adhesive or sewing. In addition, in the top structure 2 of this embodiment, the flexible insulating layer 22 of polymer film can naturally be used as an adhesive material to bond and fix the upper transverse resistive layer 23 and the lower dielectric fabric layer 21.

[0042] exist Figure 1 In the fabric-type two-dimensional flexible stress-sensitive element shown, on one hand, the conductive fabric layer 11 and elastic filling layer 12 in the bottom structure and the dielectric fabric layer 21 in the top structure together constitute a contact-separation triboelectric nanogenerator (TENG). When the top and bottom structures are subjected to external force and contact separation occurs, the relative distance or contact area between them changes. Due to the principle of electrostatic induction, the amount of charge accumulated on the conductive fabric layer 11 changes, and different electrical signals are output. Based on this, the electrical signal output by the conductive fabric layer 11 can characterize the magnitude of longitudinal stress, thereby realizing longitudinal stress sensing.

[0043] On the other hand, the top structure 2 is laterally elastic, so when subjected to lateral external forces, the lateral resistive layer 23 will be stretched or compressed, causing a change in the resistance between the two electrodes 231 in the lateral resistive layer 23. Based on this, the lateral resistive layer 23 characterizes the magnitude of the lateral stress by the resistance value between the two electrodes 231 when it deforms laterally, thereby realizing lateral stress sensing.

[0044] To make the sensing methods and performance of transverse and longitudinal stress in the fabric-type two-dimensional flexible stress-sensitive element provided in this embodiment clearer, the working principles of the two are explained in detail below: In the fabric-type two-dimensional flexible stress-sensitive element provided in this embodiment, the longitudinal stress-sensing part corresponds to a simplified model of TENG as follows: Figure 2 As shown. Based on this structure, its morphological changes and electrical responses under longitudinal stress are as follows: Figure 3 As shown. First, as Figure 3 As shown in section (a), in the initial state without pressure, the dielectric fabric layer 21 only contacts the top of the protrusion in the elastic filler layer 12, and the two remain separated from each other's main structures. When subjected to pressure or with increased pressure, as... Figure 3 As shown in section (b), the elastic filling layer 12 is deformed under pressure, causing the dielectric fabric layer 21 and the elastic filling layer 12 to move closer together, increasing the contact area. During this process, since the dielectric fabric layer 21 differs from the elastic filling layer 12 only in electronegativity, based on the principles of contact electrification or triboelectric electrification, charge transfer occurs between them. Due to the principle of electrostatic induction, the amount of charge carried on the conductive fabric layer 11 changes, and TENG outputs an electrical signal. Wherein, as... Figure 3 As shown in section (c), when the elastic filler layer 12 reaches its maximum deformation state, the dielectric fabric layer 21 and the elastic filler layer 12 are completely bonded, and the contact area reaches its maximum. At this time, the TENG output is at its maximum. Next, when the external force is removed, as... Figure 3 As shown in section (d), the deformation of the elastic filling layer 12 gradually recovers, the dielectric fabric layer 21 and the elastic filling layer 12 move further apart, and the contact area gradually decreases, which in turn weakens the electrostatic interaction between them. A reverse charge transfer occurs between the conductive fabric layer 11 and the external signal acquisition circuit, and the TENG's output electrical signal changes again. In summary, the TENG's output electrical signal is the sensing signal of the longitudinal pressure applied externally by the fabric-type two-dimensional flexible stress-sensitive element.

[0045] In the fabric-type two-dimensional flexible stress-sensitive element provided in this embodiment, the transverse resistive layer 23, which serves as the transverse stress-sensing portion, is equivalent to... Figure 4 The variable resistor model is shown. The conductive elastic layer 232 between the two electrodes 231 changes shape under lateral stress. Specifically, when subjected to tension along the line connecting the electrodes 231, the length L of the conductive elastic layer 232 increases, while the cross-sectional area S decreases. Conversely, when subjected to compression along the line connecting the electrodes 231, the length L of the conductive elastic layer 232 decreases, while the cross-sectional area S increases.

[0046] According to the following formula for the resistance value of a variable resistor, when subjected to tension, the resistance value of the transverse resistance layer 23, which acts as a variable resistor, will increase, while when subjected to compression, the resistance value of the transverse resistance layer 23, which acts as a variable resistor, will decrease.

[0047] ; In the above formula, This indicates the resistivity, which is related to the material type of the transverse resistive layer 23.

[0048] And such as Figure 5 As shown, in this embodiment, the resistance (L) and resistance (S) of the transverse resistive layer 23 are correlated with the applied transverse stress. Furthermore, L and S affect the electron mobility of the transverse resistive layer 23. Therefore, there is a certain mapping relationship between the change in resistance of the transverse resistive layer 23 and the magnitude of the applied transverse stress. This embodiment can achieve the sensing of externally applied transverse stress based on the resistance change of the sensitive element by pre-calibrating the mapping relationship between the two.

[0049] Example 2 Based on the scheme of Embodiment 1, this embodiment further provides a flexible two-dimensional pressure sensor. This flexible two-dimensional pressure sensor is a sensor that uses the fabric-type two-dimensional flexible stress-sensitive element of Embodiment 1. It has both lateral and longitudinal pressure detection capabilities and is a flexible sensor. Specifically, as shown... Figure 6 As shown, the flexible two-dimensional pressure sensor provided in this embodiment includes: a sensing film, an energy management circuit, a driving circuit, a signal acquisition circuit, and a signal processing circuit.

[0050] In this embodiment, the sensing film is formed by arranging at least one fabric-type two-dimensional flexible stress-sensitive element array as described in the previous embodiment 1. In the sensing film, the conductive fabric layer 11 of each fabric-type two-dimensional flexible stress-sensitive element constitutes a first port; the electrodes 231 on both sides of the transverse resistive layer 23 of each fabric-type two-dimensional flexible stress-sensitive element constitute a second port. In this embodiment, longitudinal pressure detection is achieved through the TENG portion of the sensing element, which is a passive device. Transverse pressure detection, however, requires the change in resistance of the transverse resistor in the sensing element, necessitating an external power supply for resistance detection. Considering that the TENG for longitudinal pressure detection can generate electrical energy during the detection process, this embodiment incorporates an energy management circuit to collect the corresponding electrical energy and use it for transverse pressure monitoring.

[0051] Specifically, in this embodiment, the energy management circuit is electrically connected to the first port and collects electrical energy output from the contact-separated triboelectric nanogenerator through the first port. The drive circuit is electrically connected to the energy management circuit and the second port. The drive circuit uses the energy management circuit as its power source and is used to output a drive signal for measuring transverse stress and a second electrical signal characterizing transverse stress to the second port. The signal acquisition circuit is electrically connected to the first port and the drive circuit. The signal acquisition circuit is used to acquire the output of the first port and use it as a first electrical signal characterizing longitudinal stress; and to acquire the second electrical signal output by the drive circuit. The signal processing module is used to amplify, filter, and perform analog-to-digital conversion on the first and second electrical signals, and then generate the corresponding measurement results of longitudinal and transverse stress according to a pre-calibrated mapping table. Since the sensor in this embodiment is similar to existing solutions in terms of signal acquisition and processing, this embodiment does not limit the structure and function of the corresponding circuit modules, as long as they can achieve the above functions.

[0052] In practical applications, the energy management circuit, drive circuit, and signal acquisition circuit can be flexible circuits integrated onto a fabric-type two-dimensional flexible stress-sensitive element. Alternatively, the energy management circuit, drive circuit, and signal acquisition circuit can be used as external circuits and electrically connected to the individual fabric-type two-dimensional flexible stress-sensitive elements in the sensing film. Electrical connections between the energy management circuit, drive circuit, signal acquisition circuit, and fabric-type two-dimensional flexible stress-sensitive elements are achieved through welding, hot pressing, or conductive adhesive bonding.

[0053] Example 3 Based on the flexible two-dimensional pressure sensor in Embodiment 1, this embodiment further provides a smart home product, which can be a smart mattress, a smart pillow, or a smart sofa. Specifically, as shown... Figure 7 As shown, this smart home appliance includes a main body and a flexible two-dimensional pressure sensor, as illustrated in Example 2, embedded in the main body. After installing the flexible two-dimensional pressure sensor, the aforementioned home appliance can monitor the lateral and longitudinal pressure at multiple points on the user's contact points. Furthermore, since the flexible two-dimensional pressure sensor itself is flexible, it can achieve non-invasive detection, improving user comfort when using the product. Based on the monitored signals, technicians can further analyze various physiological parameters such as the user's posture, position, and even heart rate, thereby providing health guidance to the user. Therefore, by introducing the flexible two-dimensional pressure sensor of this invention, traditional home appliances can be upgraded into smart products to increase their added value.

[0054] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0055] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the appended claims.

Claims

1. A fabric type two-dimensional flexible stress sensitive element, characterized by: It includes a sheet-like bottom structure and a top structure, as well as a packaging structure that allows the two to separate in longitudinal contact and restricts their lateral offset. The bottom structure consists of a conductive fabric layer and an elastic filling layer above it; the conductive fabric layer is a sheet material woven from conductive fibers; the elastic filling layer is made of an elastomer material and its upper surface includes several protruding structures. The top structure is an elastic structure capable of lateral deformation and recovery, covering the bottom structure. The top structure is a sandwich structure consisting of a dielectric fabric layer, a flexible insulating layer, and a lateral resistive layer, wherein the dielectric fabric layer is located on the side closest to the bottom structure. The dielectric fabric layer is made of a sheet material woven from dielectric fibers, which are made of a material with a different electronegativity from the elastic filler layer. The lateral resistive layer includes electrodes on both sides and a conductive elastic layer in the middle. The flexible insulating layer is used to fix the dielectric fabric layer and the lateral resistive layer together and provide electrical isolation. The conductive fabric layer, elastic filler layer, and dielectric fabric layer constitute a contact-separated triboelectric nanogenerator, and the magnitude of longitudinal stress is characterized by the electrical signal output between the conductive fabric layer and the dielectric fabric layer; the magnitude of transverse stress is characterized by the resistance value between the two electrodes when the transverse resistive layer deforms.

2. The fabric-type two-dimensional flexible stress-sensitive element as described in claim 1, characterized in that: The raised structure on the surface of the elastic filling layer is a corrugated raised structure, or a dot-matrix distributed cone-shaped, columnar, or granular raised structure.

3. The fabric-type two-dimensional flexible stress-sensitive element as described in claim 1, characterized in that: The packaging structure uses an insulating covering layer that encapsulates the bottom and top structures; Alternatively, an outer edge made of insulating material can be provided around the top and bottom structures, and the outer edges of the top and bottom structures can be fixedly connected to form an encapsulation structure.

4. The fabric-type two-dimensional flexible stress-sensitive element as described in claim 1, characterized in that: The electrodes in the lateral resistive layer are fabric electrodes; And / or, the conductive elastic layer is made of a latex material doped with carbon nanotubes; And / or, the elastomeric material of the elastic filler layer is SBS elastomer, SEBS elastomer, TPU elastomer, EVA elastomer, EPDM elastomer, CPE elastomer, PVC elastomer or silicone; And / or, the flexible insulating layer is a flexible polymer film.

5. The fabric-type two-dimensional flexible stress-sensitive element as described in claim 1, characterized in that: The conductive fibers in the conductive fabric layer are metal fibers or composite fibers with metal coating on the surface. And / or, the dielectric fibers of the dielectric fabric layer are any one of FEP, PTFE, PVDF, PFA, ETFE, and FFKM.

6. The fabric-type two-dimensional flexible stress-sensitive element as described in claim 1, characterized in that: The layers in the bottom or top structure are fixed together by adhesive or sewing.

7. A flexible two-dimensional pressure sensor, characterized in that, It includes: The sensing film is formed by arranging at least one fabric-type two-dimensional flexible stress-sensitive element array as described in any one of claims 1-6; the conductive fabric layer in each of the fabric-type two-dimensional flexible stress-sensitive elements constitutes a set of first ports; the electrodes on both sides of the transverse resistive layer in each of the fabric-type two-dimensional flexible stress-sensitive elements constitute a set of second ports. An energy management circuit is electrically connected to the first port and collects the electrical energy output by the contact-separated triboelectric nanogenerator through the first port. A drive circuit is electrically connected to the energy management circuit and the second port; the drive circuit is powered by the energy management circuit. It is used to output a drive signal for measuring transverse stress to the second port, and a second electrical signal for characterizing transverse stress. A signal acquisition circuit, which is electrically connected to the first port and the drive circuit; The signal acquisition circuit is used to acquire the output of the first port and use it as a first electrical signal characterizing longitudinal stress; and to acquire the second electrical signal output by the drive circuit. The signal processing module amplifies, filters, and performs analog-to-digital conversion on the first and second electrical signals, and then generates the corresponding longitudinal and transverse stress measurement results according to a pre-calibrated mapping table.

8. The flexible two-dimensional pressure sensor as described in claim 7, characterized in that: The energy management circuit, drive circuit, and signal acquisition circuit are flexible circuits and integrated onto the fabric-type two-dimensional flexible stress-sensitive element. Alternatively, the energy management circuit, drive circuit, and signal acquisition circuit can be used as external circuits and electrically connected to the fabric-type two-dimensional flexible stress-sensitive element.

9. The flexible two-dimensional pressure sensor as described in claim 8, characterized in that: The energy management circuit, drive circuit, signal acquisition circuit, and fabric-type two-dimensional flexible stress-sensitive element are electrically connected by welding, hot pressing, and conductive adhesive bonding.

10. A smart home product, characterized in that: It includes a body and a flexible two-dimensional pressure sensor as described in claim 7, which is embedded in the body; the body includes a mattress, pillow, or sofa.

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