Preparation method of high-flexibility composite thermoelectric fiber capable of being woven and body temperature early warning system

Abstract

The invention discloses a preparation method of a knittable high-flexibility composite thermoelectric fiber and a body temperature early warning system, and relates to the technical field of thermoelectric materials, and the preparation method is characterized in that a PEDOT: PSS spinning solution after freeze thawing treatment is dropwise added into a carbon nanotube ethanol dispersion solution, and wet spinning is carried out after stirring; drying the composite thermoelectric fiber material under a preset drying condition; the p-type composite thermoelectric fiber material is soaked in an H2SO4 solution; taking out the soaked composite fiber material, washing in water, and drying in a vacuum drying oven; and soaking the acidified p-type composite fiber material in TPU, and drying to obtain the high-flexibility composite thermoelectric fiber material capable of being woven. According to the invention, the composite thermoelectric fiber material with excellent thermoelectric performance and mechanical performance is woven into the flexible wearable thermoelectric fabric, and the thermoelectric fabric is used as a self-energized temperature sensing element to develop a body temperature early warning system, so that the heat of a human body can be collected, and the body temperature change of the human body can be monitored in real time.

Description

Technical Field

[0001] The present invention relates to the technical field of thermoelectric materials, and more specifically, to a method for preparing a braided high-flexibility composite thermoelectric fiber and a body temperature early warning system. Background Art

[0002] Thermoelectric materials have broad application prospects in the energy field due to their unique direct heat-electricity conversion characteristics. In recent years, with the rapid development of polymer-based flexible composite thermoelectric materials, thermoelectric materials have shown great application prospects in low-grade thermal energy collection, intelligent sensing, flexible electronic devices and self-powered wearable devices. As a long-term, stable, constant-temperature heat source, the human body can provide a relatively ideal temperature difference environment for thermoelectric materials. Therefore, it is of great significance to explore the application of thermoelectric materials in monitoring human body temperature through self-powering under body temperature conditions.

[0003] In recent years, one-dimensional thermoelectric fibers have unique advantages in flexible thermoelectric materials, integrated thermoelectric devices, complex structural device design and wearable thermoelectric fabrics, and have also received more and more attention. Ideal wearable thermoelectric fabrics should have high thermoelectric performance, flexibility to adapt to human movement, friction resistance and stretchability, washability and weavability. However, current technology lacks composite thermoelectric materials with high flexibility and can cooperate with body temperature alarms to achieve rapid warning, and the currently reported polymer-based thermoelectric fibers are difficult to have the above characteristics, which significantly limits the development and application of wearable thermoelectric fabrics.

[0004] Therefore, the present invention aims to provide a method for preparing a braided highly flexible composite thermoelectric fiber and a body temperature warning system to solve the above problems.

[0005] As a wearable thermoelectric fabric, it can not only collect human body heat, but also based on its sensitive thermal-electric conversion characteristics (Seebeck effect), it can also monitor human body temperature changes in real time as a self-powered temperature sensing element. Summary of the invention

[0006] The purpose of the present invention is to provide a method for preparing a weavable highly flexible composite thermoelectric fiber and a body temperature warning system. The present invention weaves a composite thermoelectric fiber material with excellent thermoelectric and mechanical properties into a flexible wearable thermoelectric fabric. At the same time, the thermoelectric fabric is used as a self-powered temperature sensing element to develop a body temperature warning system, which can not only collect human body heat, but also monitor human body temperature changes in real time.

[0007] The above technical objectives of the present invention are achieved through the following technical solutions: a method for preparing a braided high-flexibility composite thermoelectric fiber and a body temperature warning system, comprising the following steps:

[0008] S1, adding the PEDOT:PSS spinning solution after freeze-thaw treatment to the carbon nanotube ethanol dispersion, stirring evenly to reach a preset concentration, and then wet spinning to obtain a composite thermoelectric fiber material;

[0009] S2, drying the composite thermoelectric fiber material under preset drying conditions to obtain a p-type composite thermoelectric fiber material;

[0010] S3, soaking the p-type composite thermoelectric fiber material in a H2SO4 solution under preset soaking conditions;

[0011] S4, taking out the composite fiber material after soaking and washing it in water, and then drying it in a vacuum drying oven to obtain an acidified p-type composite thermoelectric fiber material;

[0012] S5. Immerse the acidified p-type composite fiber material in TPU, and obtain a weavable high-flexibility composite thermoelectric fiber material after drying, thereby completing the preparation of the weavable high-flexibility composite thermoelectric fiber.

[0013] The present invention is further configured as follows: the preparation process of the carbon nanotube ethanol dispersion in step S1 is: adding single-walled carbon nanotubes into ethanol, ultrasonically dispersing for 10-45 minutes, and obtaining the carbon nanotube ethanol dispersion.

[0014] The present invention is further configured as follows: the single-walled carbon nanotubes are single-walled carbon nanotubes that have been subjected to acid treatment.

[0015] The present invention is further configured as follows: the preparation process of the PEDOT:PSS spinning solution in step S1 is: adding 3-10% DMSO to the PEDOT:PSS dispersion, and then performing a freeze-thaw cycle treatment for 12-72 hours to obtain the PEDOT:PSS spinning solution.

[0016] The present invention is further configured as follows: the mass of the single-walled carbon nanotubes is 1-100% of the mass of the PEDOT:PSS spinning solution.

[0017] The present invention is further configured as follows: the mass of the single-walled carbon nanotubes is 1.25-5 mg.

[0018] The present invention is further configured as follows: the mass of the single-walled carbon nanotube is 1.25 mg.

[0019] The present invention is further configured as follows: the mass of the PEDOT:PSS spinning solution in step S1 is 23.75 mg.

[0020] The present invention is further configured as follows: the uniform stirring in step S1 is performed by magnetic stirring for 10-30 minutes.

[0021] The present invention is further configured as follows: the drying temperature of the preset drying conditions in step S2 is 40-70° C., and the drying time is 3-6 hours.

[0022] The present invention is further configured as follows: the preset soaking condition in step S3 is soaking at room temperature, the soaking time is 1-10 minutes, and the concentration of H2SO4 is 70%-98%.

[0023] The present invention also provides a body temperature warning system of a weavable highly flexible composite thermoelectric fiber, comprising a thermoelectric fabric, a voltage amplifier, an analog-to-digital converter, a buzzer and a wireless transmission module. The thermoelectric fabric is made of a weavable highly flexible composite thermoelectric fiber. The thermoelectric fabric, the voltage amplifier, the analog-to-digital converter, the buzzer and the wireless transmission module are electrically connected to form a loop. The voltage amplifier is used to amplify the signal, the analog-to-digital converter is used to convert the signal, the buzzer is used to issue an early warning when a limited power is reached, and the wireless transmission module is used to transmit the signal remotely.

[0024] The present invention also provides an application of a braided high-flexibility composite thermoelectric fiber in realizing human body heat collection and body temperature monitoring.

[0025] In summary, the present invention has the following beneficial effects:

[0026] The composite thermoelectric fiber material prepared by the present invention has high electrical conductivity and high flexibility. By weaving it into a wearable thermoelectric textile device and combining it with a body temperature warning system, it can realize applications such as human energy collection, body temperature monitoring / warning and external high-temperature heat source warning, and has great application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic flow chart of a method for preparing a composite thermoelectric fiber in an embodiment of the present invention;

[0028] Figure 2 3 is a scanning electron microscope image of the composite thermoelectric fiber before and after being coated with TPU in an embodiment of the present invention. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-2 The present invention is described in further detail.

[0030] Example 1: A method for preparing a braided highly flexible composite thermoelectric fiber

[0031] The composite thermoelectric fiber material used in this embodiment is p-type (the carrier is a hole), and the p-type composite fiber material is connected together by intermittently applying silver glue. The preparation method is as follows:

[0032] At room temperature, 1.25 mg of single-walled carbon nanotubes were added to ethanol and ultrasonically dispersed for 30 min to obtain a carbon nanotube ethanol dispersion;

[0033] 23.75 mg of PEDOT:PSS spinning solution was added dropwise to the obtained carbon nanotube ethanol dispersion, and magnetic stirring was performed for 30 min. A composite fiber material (SWCNT:PEDOT:PSS 5 / 95 wt %) was obtained by wet spinning.

[0034] The obtained composite fiber material was placed at 60° C. and dried for 6 hours to obtain a p-type composite fiber material;

[0035] The obtained p-type composite fiber material was immersed in H2SO4 with a concentration of 98% at room temperature for 5 minutes;

[0036] The soaked p-type composite fiber material is taken out from H2SO4 and washed with water, and then placed in a 60°C vacuum drying oven for 6 hours to obtain an acidified p-type composite fiber material;

[0037] The obtained acidified p-type composite fiber material is wound onto a rectangular object of corresponding size, and an integrated fiber thermoelectric device is prepared by brushing conductive silver glue;

[0038] The obtained integrated fiber thermoelectric device is immersed in TPU, and after drying, a composite thermoelectric fiber that can be woven with high flexibility is obtained.

[0039] After testing, the thermoelectric properties of the composite fiber material obtained according to the ratio of this embodiment are as follows: the electrical conductivity of the composite fiber material is 1950S ccm -1 , Seebeck coefficient is 17.4μV K -1 , the power factor is 59.8μW m -1 K -2 .

[0040] Example 2

[0041] At room temperature, 5 mg of single-walled carbon nanotubes were added to ethanol, first magnetically stirred for 1 hour, and then ultrasonically dispersed for 10 minutes to obtain a carbon nanotube ethanol dispersion;

[0042] 20 mg of PEDOT:PSS spinning solution (frozen and thawed twice) was added dropwise to the obtained carbon nanotube ethanol dispersion, and magnetic stirring was performed for 30 min. A composite fiber material (SWCNT:PEDOT:PSS 20 / 80 wt%) was obtained by wet spinning.

[0043] The obtained composite fiber material was placed at 60° C. and dried for 6 hours to obtain a p-type composite fiber material;

[0044] The obtained p-type composite fiber material was immersed in H2SO4 with a concentration of 98% at room temperature for 5 minutes;

[0045] The soaked p-type composite fiber material is taken out from H2SO4 and washed with water, and then placed in a 60°C vacuum drying oven for 6 hours to obtain an acidified p-type composite fiber material;

[0046] The obtained acidified p-type composite fiber material is wound onto a rectangular object of corresponding size, and an integrated fiber thermoelectric device is prepared by brushing conductive silver glue;

[0047] The obtained integrated fiber thermoelectric device is immersed in TPU, and after drying, a composite thermoelectric fiber that can be woven with high flexibility is obtained.

[0048] After testing, the thermoelectric properties of the composite fiber material obtained according to the ratio of this embodiment are as follows: the electrical conductivity of the composite fiber material is 1550S cm -1 , the Seebeck coefficient is 19.53μV K -1 , the power factor is 58.9μWm -1 K -2 .

[0049] Example 3

[0050] At room temperature, 2.5 mg of single-walled carbon nanotubes were added to ethanol, first magnetically stirred for 1 hour, and then ultrasonically dispersed for 10 minutes to obtain a carbon nanotube ethanol dispersion;

[0051] 22.5 mg of PEDOT:PSS spinning solution (frozen-thawed twice) was added dropwise to the obtained carbon nanotube ethanol dispersion, and magnetic stirring was performed for 30 min. A composite fiber material (SWCNT:PEDOT:PSS 20 / 80 wt%) was obtained by wet spinning.

[0052] The obtained composite fiber material was placed at 60° C. and dried for 6 hours to obtain a p-type composite fiber material;

[0053] The obtained p-type composite fiber material was immersed in H2SO4 with a concentration of 98% at room temperature for 5 minutes;

[0054] The soaked p-type composite fiber material is taken out from H2SO4 and washed with water, and then placed in a 60°C vacuum drying oven for 6 hours to obtain an acidified p-type composite fiber material;

[0055] The obtained acidified p-type composite fiber material is wound onto a rectangular object of corresponding size, and an integrated fiber thermoelectric device is prepared by brushing conductive silver glue;

[0056] The obtained integrated fiber thermoelectric device is immersed in TPU, and after drying, a composite thermoelectric fiber that can be woven with high flexibility is obtained.

[0057] After testing, the thermoelectric properties of the composite fiber material obtained according to the ratio of this embodiment are as follows: the electrical conductivity of the composite fiber material is 2450.67S cm -1 , Seebeck coefficient is 14.5μV K -1 , power factor is 60.1μWm -1 K -2 .

[0058] Example 4

[0059] At room temperature, 5 mg of single-walled carbon nanotubes were first doped with a 10 wt% ferric chloride aqueous solution (magnetically stirred for 6 h), filtered, and then added to an ethanol solvent, first magnetically stirred for 1 h, and then ultrasonically dispersed for 10 min to obtain a carbon nanotube ethanol dispersion;

[0060] 20 mg of PEDOT:PSS spinning solution (frozen and thawed twice) was added dropwise to the obtained carbon nanotube ethanol dispersion, and magnetic stirring was performed for 30 min. A composite fiber material (SWCNT:PEDOT:PSS 20 / 80 wt%) was obtained by wet spinning.

[0061] The obtained composite fiber material was placed at 60° C. and dried for 6 hours to obtain a p-type composite fiber material;

[0062] The obtained p-type composite fiber material was immersed in H2SO4 with a concentration of 98% at room temperature for 5 minutes;

[0063] The soaked p-type composite fiber material is taken out from H2SO4 and washed with water, and then placed in a 60°C vacuum drying oven for 6 hours to obtain an acidified p-type composite fiber material;

[0064] The obtained acidified p-type composite fiber material is wound onto a rectangular object of corresponding size, and an integrated fiber thermoelectric device is prepared by brushing conductive silver glue;

[0065] The obtained integrated fiber thermoelectric device is immersed in TPU, and after drying, a composite thermoelectric fiber that can be woven with high flexibility is obtained.

[0066] After testing, the thermoelectric properties of the composite fiber material obtained according to the ratio of this embodiment are as follows: the electrical conductivity of the composite fiber material is 1010.2S cm -1 , Seebeck coefficient is 30.2μV K -1 , the power factor is 92.13μWm -1 K -2 .

[0067] in conclusion:

[0068] In summary, the present invention composites single-walled carbon nanotubes with a high Seebeck coefficient with highly flexible PEDOT:PSS, and obtains a coated p-type composite fiber material by immersing the p-type composite fiber material in TPU to obtain a p-type composite fiber material with high flexibility and thermoelectric properties. The p-type composite fiber material can be woven into a fabric for human body temperature monitoring and energy collection, and is suitable for body temperature warning scenarios and wearable power sources.

[0069] In the present invention, the p-type composite thermoelectric fiber material prepared according to Example 1 of the present invention is often immersed in water for a long time, placed in a low-temperature environment for a long time, and subjected to cyclic bending / torsion / winding tests. The composite thermoelectric fiber material still maintains a stable structure and excellent thermoelectric performance.

[0070] Example 5: A body temperature warning system that can weave highly flexible composite thermoelectric fibers

[0071] In this embodiment, the body temperature warning system includes thermoelectric fabric, a voltage amplifier, an analog-to-digital converter, a buzzer and a wireless transmission module. The thermoelectric fabric is made of the weavable high-flexibility composite thermoelectric fiber obtained in Example 1. The thermoelectric fabric, the voltage amplifier, the analog-to-digital converter, the buzzer and the wireless transmission module are electrically connected to form a loop, wherein the thermoelectric fabric provides electrical energy for the entire loop, the voltage amplifier is used to amplify the signal, the analog-to-digital converter is used to convert the signal, the buzzer is used to issue an early warning when a limited power is reached, and the wireless transmission module is used to transmit the signal remotely.

[0072] In this embodiment, the weavable high-flexibility composite thermoelectric fiber material obtained in Example 1 is woven into a wearable thermoelectric fabric, and a voltage amplifier, an analog-to-digital converter, a buzzer and a wireless transmission module are combined to form a loop, which can effectively realize human heat collection and body temperature monitoring. In the body temperature scenario, the body temperature scenario can provide a temperature difference environment for the composite thermoelectric fiber material to be woven into a wearable thermoelectric fabric. Through the wearable thermoelectric fabric's own thermal-electric conversion performance, the human body temperature is used to generate an electrical signal in real time. When the electrical signal exceeds the threshold signal, the body temperature warning system will be activated to realize warning and remote signal transmission.

[0073] Application Scenario 1

[0074] The composite thermoelectric fiber material prepared in the above-mentioned embodiment 2 is used to process it into an integrated thermoelectric device with conductive silver glue as an electrode, wherein the device contains 50 p-type thermoelectric elements. In view of the different requirements of wearable fabric structures for different parts of the human body, they are woven into corresponding thermoelectric fabrics, which are worn on the human body in a distributed manner and then connected to the body temperature warning system and the wireless transmission system. When the threshold of the warning system is certain, the body temperature changes of different parts of the human body can be monitored in real time.

[0075] Specifically, the p-type thermoelectric fiber is continuously and intermittently brushed with conductive silver glue to construct an integrated thermoelectric device containing 50 p-type thermoelectric elements. Combined with the different requirements of the wearable fabric structure for the forehead, armpit, wrist, chest and ankle of the human body, the thermoelectric fiber is woven into corresponding thermoelectric fabrics (such as bracelet type, patch type, tethered type, etc.), and then worn on the human body. They are connected to the body temperature warning system and the wireless transmission module, and the warning threshold is set to 2.8mV. The energy generated by the temperature difference between different parts of the human body and the external environment can be collected in real time. According to the measurement, the voltages generated by the forehead, armpit, wrist, chest and ankle of the human body are 2.7, 1.8, 2.25, 1.35 and 1.1mV respectively. According to the voltage value, the change of human body temperature can be fed back. When the generated voltage value exceeds the threshold voltage of 2.8mV, the warning system will generate an alarm, and the human body temperature and warning signal can be remotely transmitted to the electronic equipment of a specific person through the wireless transmission module. In addition, the threshold voltage can also be adjusted according to actual needs to achieve timely and effective body temperature warning.

[0076] Application Scenario 2

[0077] Using the p-type composite fiber material prepared in the above-mentioned Example 1, a series device assembly strategy is adopted to assemble a p-type thermoelectric material, and then the p-type thermoelectric material is woven and assembled to obtain a composite thermoelectric material device, the composite thermoelectric material is woven into a wristband, and the wristband is worn on the wrist with the hot end against the skin and the cold end placed in the air.

[0078] Specifically, the thermoelectric textile device containing 500 p-type composite thermoelectric fibers after weaving is connected to an external load (the load resistance is equal to the internal resistance of the thermoelectric textile), and then connected to the early warning system and a wireless signal transmission module, and then worn on the wrist. The device can simultaneously realize temperature difference energy collection and body temperature monitoring. Under normal human body temperature, the maximum output power generated by the thermoelectric textile is 7.5μW, and the output voltage is 12mV. The output performance can be collected to power other micro low-power electronics. In addition, the threshold voltage of the early warning system is set to 13mV. Under normal body temperature, the output voltage generated is lower than the early warning threshold voltage. The body temperature early warning system is in an inactive state in the wireless signal transmission module, and no early warning signal is issued by the device; when the human body has a fever, the composite fiber-based thermoelectric textile will generate a higher thermoelectric voltage and output power, which will exceed the threshold voltage of 13mV, and will drive the early warning system and the honey device to generate an early warning. The wireless signal transmission module will send the early warning signal to the remote electronic device via Bluetooth, and the electronic device will then pop up a body temperature danger signal. It can be seen that the composite thermoelectric fiber material of the present invention can be successfully applied to the fields of body temperature energy collection, body temperature monitoring and early warning, and the body temperature signal can be remotely transmitted to electronic equipment through wireless signal transmission, thereby realizing real-time intelligent response recognition of human body temperature.

[0079] Application Scenario 3

[0080] The composite thermoelectric fiber material prepared in the above-mentioned embodiment 4 is integrated into gloves, wherein the number of p-type thermoelectric elements is 200. The gloves can be worn on the hands of blind people or robots, and then connected to the body temperature warning system and the wireless transmission module to realize high temperature scene recognition and warning.

[0081] Specifically, a composite fiber containing 200 p-type thermoelectric elements is integrated into a glove to obtain a wearable thermoelectric device. When worn on the hand of a blind person, it is connected to the body temperature warning system and the wireless transmission module. When the blind person is close to a high-temperature heat source (such as a fire source), the thermoelectric device will generate a large voltage. When the voltage exceeds the threshold, the warning system will generate an alarm signal to remind the blind person to stay away from the high-temperature heat source. At the same time, we can set the threshold voltage range to achieve a smarter heat source reminder. The wireless transmission module can be used when the blind person is in danger. The remote transmission signal can enable the family to be reminded and rescued in time. When worn on the hand of a robot, it can be used for the robot to sense the external temperature, and when it comes into contact with a high-temperature heat source, it can also provide a high-temperature warning reminder.

[0082] In summary, the composite thermoelectric material of the present invention has high electrical conductivity and high flexibility. As a wearable thermoelectric textile device, when combined with a body temperature alarm, it can realize applications such as human energy collection, body temperature monitoring / warning and external high-temperature heat source warning, and has great application prospects.

[0083] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A method for preparing a braided highly flexible composite thermoelectric fiber, characterized in that: The following steps are involved: S1, adding the PEDOT:PSS spinning solution after freeze-thaw treatment to the carbon nanotube ethanol dispersion, stirring evenly to reach a preset concentration, and then wet spinning to obtain a composite thermoelectric fiber material; S2, drying the composite thermoelectric fiber material under preset drying conditions to obtain a p-type composite thermoelectric fiber material; S3, soaking the p-type composite thermoelectric fiber material in a H2SO4 solution under preset soaking conditions; S4, taking out the composite fiber material after soaking and washing it in water, and then drying it in a vacuum drying oven to obtain an acidified p-type composite thermoelectric fiber material; S5. Immerse the acidified p-type composite fiber material in TPU, and obtain a weavable high-flexibility composite thermoelectric fiber material after drying, thereby completing the preparation of the weavable high-flexibility composite thermoelectric fiber.

2. The method for preparing a braidable high-flexibility composite thermoelectric fiber according to claim 1, characterized in that: The preparation process of the carbon nanotube ethanol dispersion in step S1 is as follows: adding single-walled carbon nanotubes into ethanol, and ultrasonically dispersing for 10-45 minutes to obtain the carbon nanotube ethanol dispersion.

3. The method for preparing a braidable high-flexibility composite thermoelectric fiber according to claim 2, characterized in that: The single-walled carbon nanotubes are acid-treated single-walled carbon nanotubes.

4. The method for preparing a braidable high-flexibility composite thermoelectric fiber according to claim 1, characterized in that: The preparation process of the PEDOT:PSS spinning solution in step S1 is as follows: 3-10% DMSO is added to the PEDOT:PSS dispersion, and then freeze-thaw cycle treatment is performed for 12-72 hours to obtain the PEDOT:PSS spinning solution.

5. The method for preparing a braidable high-flexibility composite thermoelectric fiber according to claim 2, characterized in that: The mass of the single-walled carbon nanotubes is 1-100% of the mass of the PEDOT:PSS spinning solution.

6. The method for preparing a braidable high-flexibility composite thermoelectric fiber according to claim 2, characterized in that: The mass of the single-walled carbon nanotube is 1.25-5 mg.

7. The method for preparing a braidable high-flexibility composite thermoelectric fiber according to claim 6, characterized in that: The mass of the single-walled carbon nanotube is 1.25 mg.

8. The method for preparing a braidable high-flexibility composite thermoelectric fiber according to claim 1, characterized in that: The mass of the PEDOT:PSS spinning solution in step S1 is 23.75 mg.

9. The method for preparing a braidable high-flexibility composite thermoelectric fiber according to claim 1, characterized in that: The uniform stirring in step S1 is performed by magnetic stirring for 10-30 minutes.

10. The method for preparing a braidable high-flexibility composite thermoelectric fiber according to claim 1, characterized in that: The drying conditions preset in step S2 are a drying temperature of 40-70° C. and a drying time of 3-6 hours.

11. The method for preparing a braidable high-flexibility composite thermoelectric fiber according to claim 1, characterized in that: The preset soaking conditions in step S3 are soaking at room temperature, soaking time of 1-10 minutes, and H2SO4 concentration of 70%-98%.

12. The body temperature warning system of the braided high-flexibility composite thermoelectric fiber according to claim 1 is characterized by: It includes thermoelectric fabric, voltage amplifier, analog-to-digital converter, buzzer and wireless transmission module. The thermoelectric fabric is made of weavable high-flexibility composite thermoelectric fiber. The thermoelectric fabric, voltage amplifier, analog-to-digital converter, buzzer and wireless transmission module are electrically connected to form a loop. The voltage amplifier is used to amplify the signal, the analog-to-digital converter is used to convert the signal, the buzzer is used to give an early warning when the limited power is reached, and the wireless transmission module is used to transmit the signal remotely.

13. Application of the braidable high-flexibility composite thermoelectric fiber according to claim 1 in realizing human body heat collection and body temperature monitoring.

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