Humanoid robot wearable flexible vibration sensing sensor and preparation method thereof

Abstract

The invention relates to a wearable flexible vibration sensing sensor for a humanoid robot and a preparation method of the wearable flexible vibration sensing sensor. The sensor structure comprises an upper packaging layer, a lower packaging layer, a moisture absorption layer, a hydrogel layer, a graphene layer, an electrode layer and a flexible circuit board. Wherein the upper packaging layer and the lower packaging layer protect the internal structure, the moisture absorption layer enhances the moisture absorption capacity in the environment, the hydrogel layer maintains moisture and forms a concentration gradient, the graphene layer enhances the sensitivity of the sensor, the electrode layer collects ion migration to generate voltage, and a signal amplification circuit and a wireless transmission module are embedded in the flexible circuit board. The method is characterized in that a vibration signal is converted into voltage change through ion migration between the hydrogel layer and the graphene layer, and accurate vibration sensing is achieved. The sensor has high sensitivity, quick response and good flexibility, is suitable for being integrated into the humanoid robot, and improves the environmental perception and interaction performance of the humanoid robot.

Description

Technical Field

[0001] The present invention relates to the technical field of flexible sensors, and in particular to a wearable flexible vibration sensing sensor for a humanoid robot and a preparation method thereof. Background Art

[0002] With the rapid development of robotics technology, humanoid robots are increasingly used in industries such as industry, services, and medical care. In order to improve the intelligence level and interactive capabilities of humanoid robots, higher requirements are placed on the perception system of humanoid robots. In particular, vibration perception sensors can detect the contact and interaction between humanoid robots and the environment, which is crucial for humanoid robot motion control and environmental adaptability.

[0003] Existing vibration sensing sensors mainly include piezoelectric, capacitive, resistive and other types. Although these sensors have their own advantages in sensitivity, response speed, durability and other aspects, they still face some common challenges in practical applications. For example, many sensors require complex energy collection and conversion systems, which not only increases costs but also increases system complexity. In addition, the rigid structure of traditional sensors limits their application in wearable flexible devices for humanoid robots, which is particularly prominent in scenarios where humanoid robots need to interact closely with humans.

[0004] Another challenge is that existing sensors are easily damaged when faced with collisions or impacts, resulting in loss of monitoring data. This is unacceptable for applications that require continuous monitoring, especially when humanoid robots are performing complex or dangerous tasks.

[0005] In order to solve the above problems, the present invention proposes a novel wearable flexible vibration sensing sensor for a humanoid robot. Summary of the invention

[0006] In view of this, the purpose of the present invention is to provide a wearable flexible vibration sensing sensor for a humanoid robot and a preparation method thereof, aiming to solve a series of challenges encountered by the prior art in the perception system of a humanoid robot. With the development of robotics technology, especially in the fields of industry, service, and medical care, the requirements for the intelligence level and interactive capabilities of humanoid robots are increasing. As a key component of the perception system of a humanoid robot, the performance of the vibration sensing sensor directly affects the motion control and environmental adaptability of the humanoid robot.

[0007] To achieve the above-mentioned object, the present invention adopts the following technical scheme: a wearable flexible vibration sensing sensor for a humanoid robot, comprising an upper packaging layer, a moisture absorbing layer, a hydrogel layer, a graphene layer, an electrode layer, a flexible circuit board and a lower packaging layer; The upper packaging layer is located on the top of the sensor and is used to protect the internal structure of the sensor; The moisture absorption layer is arranged below the upper packaging layer and is made of polyacrylic acid and a flexible non-woven fabric substrate to enhance the ability to absorb moisture in the environment; The hydrogel layer is located below the moisture-absorbing layer and is made of a hydrogel solution and a flexible non-woven fabric substrate; The graphene layer is located below the hydrogel layer and is made of a graphene solution and a flexible non-woven fabric substrate; The electrode layer is arranged below the graphene layer and is used to collect the voltage generated by ion migration between the hydrogel layer and the graphene layer; The flexible circuit board is arranged below the electrode layer and is embedded with a signal amplification circuit and a wireless transmission module; The lower packaging layer is located at the bottom of the sensor and is used to protect the internal structure of the sensor. Its area is greater than or equal to the area of ​​the hydrogel layer, the graphene layer, the electrode layer and the flexible circuit board to ensure that the entire sensor structure is completely encapsulated.

[0008] In a preferred embodiment: the upper packaging layer and the lower packaging layer are both made of polyimide PI film to improve the heat resistance and chemical resistance of the sensor.

[0009] In a preferred embodiment, the moisture absorbing layer has a porous structure to improve its water absorbing and retaining capacity.

[0010] In a preferred embodiment: the thickness of the hydrogel layer and the graphene layer is 100-200 microns to ensure the sensitivity and response speed of the sensor.

[0011] In a preferred embodiment: the electrode layer is made by printing a conductive material to ensure good electrical contact and signal transmission.

[0012] In a preferred embodiment: the overall thickness of the sensor does not exceed 2 mm to ensure wearability and flexibility.

[0013] In a preferred embodiment: the signal amplification circuit and the wireless transmission module are integrated on a flexible circuit board layer to achieve signal amplification and wireless transmission.

[0014] The present invention also provides a method for preparing a wearable flexible vibration sensing sensor for a humanoid robot, comprising the following steps: Step S1, using a polyimide PI film to form an upper and a lower packaging layer through a cutting process; Step S2, using polyacrylic acid and a flexible non-woven fabric substrate to form a moisture absorption layer through a cutting process; Step S3, immersing the non-woven fabric substrate in the polyacrylic acid hydrogel solution, and forming a hydrogel layer after drying; Step S4, immersing the non-woven fabric substrate in a graphene dispersion and forming a graphene layer after drying; Step S5, printing a metal electrode on the graphene layer to form an electrode layer; Step S6, ensuring that the electrodes on the flexible circuit board match the electrode layer to achieve electrical connection; Step S7, stacking and aligning the upper packaging layer, the moisture absorption layer, the hydrogel layer, the graphene layer, the electrode layer and the flexible circuit board, and bonding them by heat pressing or adhesive to form a sensor main structure; Step S8: Bond the lower packaging layer to the bottom of the sensor main structure to completely encapsulate the sensor structure.

[0015] In a preferred embodiment: the step S3 is specifically as follows: Step S31, preparing a hydrogel dispersion to ensure that polyacrylic acid is evenly dispersed in the solution; Step S32, slowly immersing the non-woven fabric substrate in the polyacrylic acid hydrogel solution preheated to 60° C. for 3 minutes to ensure that the non-woven fabric is completely covered by the solution; Step S33, taking out the non-woven fabric substrate, controlling the ambient temperature at 25° C. and leaving it to stand for 5 minutes to ensure that the solution is fully absorbed by the non-woven fabric; Step S34, repeating step S32 and step S33 to enhance the thickness and uniformity of the hydrogel layer; Step S35, drying the treated non-woven fabric substrate naturally in a well-ventilated environment, or drying at 40° C. for 1 hour to form a hydrogel layer; In a preferred embodiment: the step S4 is specifically as follows: Step S41, preparing a graphene dispersion solution to ensure that the graphene is evenly dispersed in the solution; Step S42, immersing the non-woven fabric in the graphene dispersion for 5 minutes to ensure that the surface of the non-woven fabric is evenly covered with the graphene solution; Step S43, taking out the non-woven fabric, controlling the ambient temperature to stand at 25° C. for 5 minutes to ensure that the graphene solution is fully absorbed by the non-woven fabric; Step S44, repeating steps S42 and S43 to enhance the conductivity and uniformity of the graphene layer; Step S45: Dry the treated non-woven fabric naturally in a well-ventilated environment, or dry it at 40° C. for 1 hour to form a graphene layer.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The sensor of the present invention adopts the principle of moisture power generation. When the sensor vibrates, it generates voltage fluctuations, thereby realizing sensitive perception of vibration. This design directly uses moisture in the environment as an energy source, eliminating the external power supply required by traditional sensors, simplifying the energy collection and conversion system, thereby reducing costs and improving system reliability.

[0017] 2. The sensor of the present invention has good scalability and customizability. The size, shape and material composition of the sensor can be adjusted according to different application requirements to meet the monitoring requirements in specific scenarios. This flexibility enables the sensor to adapt to the diverse humanoid robot design and application requirements.

[0018] 3. The sensor of the present invention is easy to maintain and adopts a modular design, so that sensor components can be quickly replaced when needed, reducing maintenance costs and time. At the same time, in order to improve the accuracy and comprehensiveness of monitoring, the sensor system of the present invention can also be integrated with other types of sensors to achieve multi-sensor data fusion and provide more comprehensive environmental information. This multi-sensor fusion technology uses comprehensive and complete information about objects and environments obtained by multiple sensors to greatly enhance the perception ability and decision-making efficiency of humanoid robots.

[0019] 4. The sensor of the present invention is suitable for high-sensitivity and fast-response application scenarios, such as humanoid robot balance control, precision operation and environmental interaction. The sensor design allows it to accurately capture vibrations in all directions, ensuring accurate monitoring of robot motion. This omnidirectional vibration sensing capability enables the robot to more accurately perceive and adapt to its operating environment, thereby demonstrating higher accuracy and reliability in complex action execution and interactive response. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the wearable flexible vibration sensing sensor for a humanoid robot of the present invention; Figure 2 This is an exploded view of a wearable flexible vibration sensing sensor for a humanoid robot according to the present invention; Figure 3 is a cross-sectional view of a wearable flexible vibration sensing sensor for a humanoid robot according to the present invention; Figure 4 It is a three-view drawing of the wearable flexible vibration sensing sensor for a humanoid robot of the present invention; Figure 5 This is a diagram of the moisture power generation component of the wearable flexible vibration sensing sensor for a humanoid robot of the present invention; Figure 6 It is a hygroscopic layer component layer of the wearable flexible vibration sensing sensor for a humanoid robot of the present invention; Figure 7 It is a schematic diagram of the principle of the flexible circuit board signal amplification circuit of the wearable flexible vibration sensing sensor of the humanoid robot of the present invention; Figure 8 This is a schematic diagram of the structure of a flexible circuit board of a wearable flexible vibration sensing sensor for a humanoid robot of the present invention; Fig. 9 It is a schematic diagram of the packaging layer structure of the wearable flexible vibration sensing sensor for a humanoid robot of the present invention; Fig.10This is a flow chart for preparing a wearable flexible vibration sensing sensor for a humanoid robot according to the present invention; Fig.11 This is a working principle diagram of the wearable flexible vibration sensing sensor for a humanoid robot of the present invention; Fig.12 This is a result diagram of the static state of the wearable flexible vibration sensing sensor for a humanoid robot of the present invention; Fig.13 This is a motion state result diagram of the wearable flexible vibration sensing sensor of the humanoid robot of the present invention; Figure 2 Middle: 1-upper packaging layer, 2-hygroscopic layer, 3-hydrogel layer, 4-graphene layer, 5-electrode layer, 6-flexible circuit board, 7-lower packaging layer. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0022] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0023] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application; as used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or their combinations.

[0024] A wearable flexible vibration sensing sensor for humanoid robots, reference Figure 1-13 , comprising an upper packaging layer 1, a hygroscopic layer 2, a hydrogel layer 3, a graphene layer 4, an electrode layer 5, a flexible circuit board 6 and a lower packaging layer 7; The upper packaging layer 1 is located on the top of the sensor and is used to protect the internal structure of the sensor; The moisture absorption layer 2 is arranged below the upper packaging layer 1 and is made of polyacrylic acid and a flexible non-woven fabric substrate to enhance the ability to absorb moisture in the environment; The hydrogel layer 3 is located below the moisture absorbing layer 2 and is made of a hydrogel solution and a flexible non-woven fabric substrate; The graphene layer 4 is located below the hydrogel layer 3 and is made of a graphene solution and a flexible non-woven fabric substrate; The electrode layer 5 is disposed below the graphene layer 4 and is used to collect the voltage generated by ion migration between the hydrogel layer and the graphene layer; The flexible circuit board 6 is arranged below the electrode layer 5 and is embedded with a signal amplification circuit and a wireless transmission module; The lower packaging layer 7 is located at the bottom of the sensor and is used to protect the internal structure of the sensor. Its area is greater than or equal to the area of ​​the hydrogel layer 3, the graphene layer 4, the electrode layer 5 and the flexible circuit board 6 to ensure that the entire sensor structure is completely encapsulated.

[0025] The upper packaging layer 1 and the lower packaging layer 7 are both made of polyimide PI film to improve the heat resistance and chemical resistance of the sensor.

[0026] The moisture absorption layer 2 has a porous structure to improve its water absorption and water retention capabilities.

[0027] The thickness of the hydrogel layer 3 and the graphene layer 4 is 100-200 microns to ensure the sensitivity and response speed of the sensor.

[0028] The electrode layer 5 is made by printing conductive material to ensure good electrical contact and signal transmission.

[0029] The overall thickness of the sensor does not exceed 2 mm to ensure wearability and flexibility.

[0030] The signal amplification circuit and the wireless transmission module are integrated on the flexible circuit board layer to achieve signal amplification and wireless transmission.

[0031] The present invention also provides a method for preparing a wearable flexible vibration sensing sensor for a humanoid robot, comprising the following steps: Step S1, using a polyimide PI film through a cutting process to form an upper encapsulation layer 1 and a lower encapsulation layer 7; Step S2, using polyacrylic acid and a flexible non-woven fabric substrate to form a moisture absorbing layer 2 through a cutting process; Step S3, immersing the non-woven fabric substrate in the polyacrylic acid hydrogel solution, and forming a hydrogel layer 3 after drying; Step S4, immersing the non-woven fabric substrate in a graphene dispersion, and forming a graphene layer 4 after drying; Step S5, printing a metal electrode on the graphene layer to form an electrode layer 5; Step S6, ensuring that the electrodes on the flexible circuit board 6 match the electrode layer 5 to achieve electrical connection; Step S7, stacking and aligning the upper packaging layer 1, the hygroscopic layer 2, the hydrogel layer 3, the graphene layer 4, the electrode layer 5 and the flexible circuit board 6, and forming a sensor main structure by hot pressing or adhesive bonding; Step S8: Bond the lower packaging layer 7 to the bottom of the sensor main structure to completely encapsulate the sensor structure.

[0032] The step S3 is specifically as follows: Step S31, preparing a hydrogel dispersion to ensure that polyacrylic acid is evenly dispersed in the solution; Step S32, slowly immersing the non-woven fabric substrate in the polyacrylic acid hydrogel solution preheated to 60° C. for 3 minutes to ensure that the non-woven fabric is completely covered by the solution; Step S33, taking out the non-woven fabric substrate, controlling the ambient temperature at 25° C. and leaving it to stand for 5 minutes to ensure that the solution is fully absorbed by the non-woven fabric; Step S34, repeating step S32 and step S33 to enhance the thickness and uniformity of the hydrogel layer; Step S35, drying the treated non-woven fabric substrate naturally in a well-ventilated environment, or drying at 40° C. for 1 hour to form a hydrogel layer 3; The step S4 is specifically as follows: Step S41, preparing a graphene dispersion solution to ensure that the graphene is evenly dispersed in the solution; Step S42, immersing the non-woven fabric in the graphene dispersion for 5 minutes to ensure that the surface of the non-woven fabric is evenly covered with the graphene solution; Step S43, taking out the non-woven fabric, controlling the ambient temperature to stand at 25° C. for 5 minutes to ensure that the graphene solution is fully absorbed by the non-woven fabric; Step S44, repeating steps S42 and S43 to enhance the conductivity and uniformity of the graphene layer; Step S45: Dry the treated non-woven fabric naturally in a well-ventilated environment, or dry it at 40° C. for 1 hour to form a graphene layer 4.

[0033] Specifically, by constructing an asymmetric structure inside the material, namely the hydrogel layer 3 and the graphene layer 4, this structural design allows the functional groups or water content inside the hydrogel layer 3 to present a gradient distribution, thereby maintaining a constant voltage at the interface between the hydrogel layer 3 and the graphene layer 4 when no external force is applied.

[0034] When the sensor is vibrated by the movement of the humanoid robot, the microenvironment changes induced by the vibration instantly disturb the ion migration balance in the hydrogel layer. Specifically, the ion concentration gradient between the hydrogel layer 3 and the graphene layer 4 promotes the formation of a stable voltage at the two interfaces. Due to the large size of anions, they are bound to the conjugated structure or long chain and cannot migrate freely, while cations migrate from the high concentration area to the low concentration area under the action of the electric field, forming a cation gradient structure.

[0035] Under the continuous action of the ion concentration gradient, the migration of cations produces a stable voltage output. When the sensor encounters external vibration, the vibration causes the instantaneous change of the ion migration pattern, resulting in a brief disturbance of the cation distribution, which in turn causes voltage fluctuations. This instantaneous voltage fluctuation directly reflects the vibration intensity and frequency.

[0036] When the vibration stops, the ion migration pattern in the hydrogel layer 3 gradually returns to a balanced state over time, and the cations are redistributed under the electric field force generated by the anions and return to the original stable distribution state. The flexible circuit board 6 is responsible for collecting these voltage changes, converting the mechanical vibration into a measurable electrical signal, and realizing sensitive perception of the vibration.

[0037] The sensor works as follows: Step A1: Sensor installation: According to the specific application scenarios and requirements of the humanoid robot, select an appropriate installation location, usually the key motion joints of the humanoid robot or the area that needs to monitor vibration. Fix the sensor on the surface of the humanoid robot to ensure that it will not shift or fall off during the movement of the humanoid robot.

[0038] Step A2: Sensor activation: After installation, expose the sensor to the environment and naturally absorb the surrounding moisture. This step is crucial to activate the moisture power generation unit in the sensor, because the presence of moisture is a prerequisite for generating electricity. When the sensor absorbs enough moisture, the internal voltage will gradually stabilize.

[0039] Step A3: Vibration signal conversion: When the humanoid robot moves, the sensor monitors and captures the vibration caused by the movement in real time. These vibrations are converted into voltage through the interaction between the hydrogel layer and the graphene layer. The graphene layer enhances the sensitivity of the sensor and ensures that the vibration signal is accurately captured.

[0040] Step A4: Data recording and processing: The electrical signals captured by the sensor are amplified and converted into digital signals by the built-in circuit system, and then stored in the sensor data processing module. These data can be transmitted to the robot control system in real time or saved for subsequent analysis.

[0041] Step A5: Sensor standby and maintenance: When the humanoid robot stops operating, that is, when the humanoid robot is no longer vibrating or moving, the sensor will automatically enter a low-power standby mode. In this mode, the sensor energy consumption is reduced to a minimum to ensure that the sensor can save energy to the maximum extent during inactivity.

[0042] In practical applications, the sensor of the present invention can be seamlessly integrated into the control system of a humanoid robot. The sensor transmits the collected vibration data to the central processing unit in real time through a built-in data processing module. These data are then used for robot motion analysis and environmental adaptability assessment. In addition, the sensor output signal can be fused with other perception modules on the robot, such as visual, tactile or sound sensor data, thereby providing a comprehensive environmental perception capability and enhancing the robot's ability to understand and respond to the surrounding environment.

[0043] Through the above-mentioned implementation, the sensor of the present invention realizes high sensitivity to vibration. When the humanoid robot moves, the sensor can accurately capture the voltage changes caused by the movement and convert these changes into electrical signals that can be used in the robot control system. This self-powered design eliminates the need for external power supply, thereby improving the practicality and reliability of the sensor. At the same time, the modular design of the sensor simplifies the maintenance and replacement process, reduces long-term operating costs and prolongs the service life.

Claims

1. A wearable flexible vibration sensing sensor for a humanoid robot, characterized in that: It includes an upper packaging layer, a moisture absorption layer, a hydrogel layer, a graphene layer, an electrode layer, a flexible circuit board and a lower packaging layer; The upper packaging layer is located on the top of the sensor and is used to protect the internal structure of the sensor; The moisture absorption layer is arranged below the upper packaging layer and is made of polyacrylic acid and a flexible non-woven fabric substrate to enhance the ability to absorb moisture in the environment; The hydrogel layer is located below the moisture-absorbing layer and is made of a hydrogel solution and a flexible non-woven fabric substrate; The graphene layer is located below the hydrogel layer and is made of a graphene solution and a flexible non-woven fabric substrate; The electrode layer is arranged below the graphene layer and is used to collect the voltage generated by ion migration between the hydrogel layer and the graphene layer; The flexible circuit board is arranged below the electrode layer and is embedded with a signal amplification circuit and a wireless transmission module; The lower packaging layer is located at the bottom of the sensor and is used to protect the internal structure of the sensor. Its area is greater than or equal to the area of ​​the hydrogel layer, the graphene layer, the electrode layer and the flexible circuit board to ensure that the entire sensor structure is completely encapsulated.

2. A wearable flexible vibration sensing sensor for a humanoid robot according to claim 1, characterized in that: The upper packaging layer and the lower packaging layer are both made of polyimide PI film to improve the heat resistance and chemical resistance of the sensor.

3. The wearable flexible vibration sensing sensor for a humanoid robot according to claim 1, characterized in that: The moisture absorption layer has a porous structure to improve its water absorption and water retention capabilities.

4. The wearable flexible vibration sensing sensor for a humanoid robot according to claim 1, characterized in that: The thickness of the hydrogel layer and the graphene layer is 100-200 microns to ensure the sensitivity and response speed of the sensor.

5. The wearable flexible vibration sensing sensor for a humanoid robot according to claim 1, characterized in that: The electrode layer is made by printing a conductive material to ensure good electrical contact and signal transmission.

6. The wearable flexible vibration sensing sensor for a humanoid robot according to claim 1, characterized in that: The overall thickness of the sensor does not exceed 2 mm to ensure wearability and flexibility.

7. The wearable flexible vibration sensing sensor for a humanoid robot according to claim 1, characterized in that: The signal amplification circuit and the wireless transmission module are integrated on the flexible circuit board layer to achieve signal amplification and wireless transmission.

8. A method for preparing a wearable flexible vibration sensing sensor for a humanoid robot according to any one of claims 1 to 7, characterized in that The following steps are involved: Step S1, using a polyimide PI film to form an upper and a lower packaging layer through a cutting process; Step S2, using polyacrylic acid and a flexible non-woven fabric substrate to form a moisture absorption layer through a cutting process; Step S3, immersing the non-woven fabric substrate in the polyacrylic acid hydrogel solution, and forming a hydrogel layer after drying; Step S4, immersing the non-woven fabric substrate in a graphene dispersion and forming a graphene layer after drying; Step S5, printing a metal electrode on the graphene layer to form an electrode layer; Step S6, ensuring that the electrodes on the flexible circuit board match the electrode layer to achieve electrical connection; Step S7, stacking and aligning the upper packaging layer, the moisture absorption layer, the hydrogel layer, the graphene layer, the electrode layer and the flexible circuit board, and bonding them by heat pressing or adhesive to form a sensor main structure; Step S8: Bond the lower packaging layer to the bottom of the sensor main structure to completely encapsulate the sensor structure.

9. The method for preparing a wearable flexible vibration sensing sensor for a humanoid robot according to claim 8, characterized in that: The step S3 is specifically as follows: Step S31, preparing a hydrogel dispersion to ensure that polyacrylic acid is evenly dispersed in the solution; Step S32, slowly immersing the non-woven fabric substrate in the polyacrylic acid hydrogel solution preheated to 60° C. for 3 minutes to ensure that the non-woven fabric is completely covered by the solution; Step S33, taking out the non-woven fabric substrate, controlling the ambient temperature at 25° C. and leaving it to stand for 5 minutes to ensure that the solution is fully absorbed by the non-woven fabric; Step S34, repeating step S32 and step S33 to enhance the thickness and uniformity of the hydrogel layer; Step S35: Dry the treated non-woven fabric substrate naturally in a well-ventilated environment, or dry it at 40° C. for 1 hour to form a hydrogel layer.

10. The method for preparing a wearable flexible vibration sensing sensor for a humanoid robot according to claim 8, characterized in that: The step S4 is specifically as follows: Step S41, preparing a graphene dispersion solution to ensure that the graphene is evenly dispersed in the solution; Step S42, immersing the non-woven fabric in the graphene dispersion for 5 minutes to ensure that the surface of the non-woven fabric is evenly covered with the graphene solution; Step S43, taking out the non-woven fabric, controlling the ambient temperature to 25° C. and leaving it to stand for 5 minutes to ensure that the graphene solution is fully absorbed by the non-woven fabric; Step S44, repeating steps S42 and S43 to enhance the conductivity and uniformity of the graphene layer; Step S45: Dry the treated non-woven fabric naturally in a well-ventilated environment, or dry it at 40° C. for 1 hour to form a graphene layer.

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