Two-dimensional flexible thermoelectric device output performance test platform and test method thereof

Abstract

The invention belongs to the field of flexible electronic devices, and particularly provides a two-dimensional flexible thermoelectric device output performance test platform and a test method thereof, which are used for completing standardized test of the output performance of a two-dimensional flexible thermoelectric device. The testing platform comprises a curvature radius fixing mold 1, an electrochemical workstation 2, an upper computer 3 and a temperature difference adjusting device, the temperature difference adjusting device comprises a heating table 5, a refrigeration sheet 6 and a thermometer 7, and the two-dimensional flexible thermoelectric device works under the bending condition of a preset curvature radius through the curvature radius fixing mold; enabling the two-dimensional flexible thermoelectric device to work under a preset cold and hot end temperature difference condition through the temperature difference adjusting device; on the basis, the output performance of the two-dimensional flexible thermoelectric device can be measured in a standardized mode under the conditions of different curvature radiuses and different cold and hot end temperature differences, efficient and accurate performance evaluation is achieved, and a reliable basis is provided for design, optimization and application of the two-dimensional flexible thermoelectric device.

Description

Technical Field

[0001] The present invention belongs to the field of flexible electronic devices, and relates to a planar two-dimensional flexible thermoelectric device, and specifically provides an output performance test platform and a test method for a two-dimensional flexible thermoelectric device under a given bending state. Background Art

[0002] With the development of science and technology and the increasing demand for portable and wearable electronic devices, the application of flexible electronic devices in various fields has gradually expanded. Among them, planar two-dimensional flexible thermoelectric devices, as a high-efficiency energy conversion device that can convert thermal energy into electrical energy, have the characteristics of lightness, softness, and bendability, and have become a hot spot for research and development. In addition to being widely used in wearable devices, two-dimensional flexible thermoelectric devices have outstanding prospects in medical health monitoring, environmental monitoring, and smart textiles.

[0003] In practical applications, two-dimensional flexible thermoelectric devices usually need to contact the human body or other non-flat surfaces. Therefore, the evaluation of thermoelectric performance under different bending radii of curvature is crucial; however, the output performance test of two-dimensional flexible thermoelectric devices under different curvature radii using existing platforms still has major deficiencies, mainly manifested in the lack of unified test standards and limited scope of application. These deficiencies lead to the inability to accurately evaluate the performance of two-dimensional flexible thermoelectric devices in practical applications, which in turn affects their design optimization and application effects. Based on this, the present invention proposes a two-dimensional flexible thermoelectric device output performance test platform and a test method thereof, which are used to standardize the test process so that two-dimensional flexible thermoelectric devices can be accurately evaluated in the test. Summary of the invention

[0004] The purpose of the present invention is to provide a two-dimensional flexible thermoelectric device output performance test platform and a test method thereof, design a standardized test process, and perform standardized measurement of the output performance (power) of the two-dimensional flexible thermoelectric device under different curvature radii and different hot and cold end temperature differences, so as to achieve efficient and accurate performance evaluation and provide a reliable basis for the design, optimization and application of two-dimensional flexible thermoelectric devices.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] A two-dimensional flexible thermoelectric device output performance test platform comprises: a curvature radius fixed mold 1, an electrochemical workstation 2, a host computer 3 and a temperature difference adjustment device; characterized in that the temperature difference adjustment device comprises: a heating platform 5, a cooling plate 6 and a thermometer 7; the curvature radius fixed mold is arranged on the temperature difference adjustment device, and the two-dimensional flexible thermoelectric device 4 to be tested is fitted on the curvature radius fixed mold so that it works under a bending condition of a predetermined curvature radius; the heating platform heats the hot end of the two-dimensional flexible thermoelectric device through the curvature radius fixed mold, and the cooling plate cools the cold end of the two-dimensional flexible thermoelectric device through the curvature radius fixed mold, and the heating area and the cooling area of ​​the two-dimensional flexible thermoelectric device are the same, and the cold end temperature and the hot end temperature of the two-dimensional flexible thermoelectric device are monitored by the thermometer so that it works under a predetermined cold and hot end temperature difference condition; the electrochemical workstation collects output data of the two-dimensional flexible thermoelectric device to be tested, and completes data processing through the host computer to obtain the output performance index of the two-dimensional flexible thermoelectric device.

[0007] Furthermore, the heating platform and the refrigeration plate are arranged along the same horizontal plane.

[0008] Furthermore, the curvature radius fixed mold is composed of a pair of strip molds with the same structure and size, the cross-section of the strip mold is a right-angled triangle, and the hypotenuse of the right-angled triangle is an arc; the two strip molds are symmetrically arranged on the heating table and the cooling plate of the temperature difference adjustment device, and the arc-shaped outer surfaces of the two strip molds are located on the arc surface of the predetermined curvature radius.

[0009] Furthermore, the curvature radius fixing mold is made of metal material, and more preferably aluminum.

[0010] Furthermore, the electrochemical workstation uses linear voltammetry to measure the output voltage of the two-dimensional flexible thermoelectric device. The electrochemical workstation is connected to both ends of the two-dimensional flexible thermoelectric device, and obtains corresponding output voltage response data by applying a scanning current to form a voltage-current data pair, which is transmitted to the host computer in real time through a data transmission line.

[0011] Furthermore, the host computer receives and stores the voltage-current data pairs of the two-dimensional flexible thermoelectric device sent by the electrochemical workstation in real time, converts the voltage-current data into power-current data according to the power calculation formula, obtains the output power curve of the two-dimensional flexible thermoelectric device to be tested, and finally calculates the output performance index of the two-dimensional flexible thermoelectric device according to the output power curve.

[0012] Furthermore, the output performance index of the two-dimensional flexible thermoelectric device is defined as:

[0013]

[0014] Where DP represents the peak output power per unit area and unit temperature of the two-dimensional flexible thermoelectric device, P peak is the output power peak of the two-dimensional flexible thermoelectric device, S is the area of ​​the two-dimensional flexible thermoelectric device, and ΔT is the temperature difference between the hot and cold ends of the two-dimensional flexible thermoelectric device.

[0015] Furthermore, a method for testing the output performance of a two-dimensional flexible thermoelectric device based on the above-mentioned testing platform comprises the following steps:

[0016] S1, placing the flexible two-dimensional thermoelectric device to be tested on a mold with a fixed curvature radius, so that the two-dimensional flexible thermoelectric device is under a predetermined curvature radius R0;

[0017] S2, adjusting the temperature difference between the hot and cold ends of the two-dimensional flexible thermoelectric device by a temperature difference adjustment device, so that the two-dimensional flexible thermoelectric device is under the condition of a temperature difference between the hot and cold ends ΔT0;

[0018] S3, collecting the output data of the two-dimensional flexible thermoelectric device to be tested through the electrochemical workstation, and completing the data processing through the host computer to obtain the output performance index of the flexible two-dimensional thermoelectric device under the combined condition (R0, ΔT0);

[0019] S4, adjusting the temperature difference between the hot and cold ends of the two-dimensional flexible thermoelectric device to ΔT1, ΔT2, ΔT3, ..., ΔT M Repeat step S3 to obtain the flexible two-dimensional thermoelectric device under the combined condition (R0, ΔT m ) output performance index under, m = 0, 1, 2, 3, ..., M;

[0020] S5, replace the curvature radius fixing mold, so that the two-dimensional flexible thermoelectric device is at the predetermined curvature radius R1, R2, R3, ..., R N Repeat steps S3 and S4 to obtain the flexible two-dimensional thermoelectric device under the combined condition (R n ,ΔT m ), n=0,1,2,3,...,N, m=0,1,2,3,...,M.

[0021] Based on the above technical solution, the beneficial effects of the present invention are:

[0022] 1) The test platform provided by the present invention can be adapted to the precise test of the output performance of two-dimensional flexible thermoelectric devices under bending conditions, and has a wide range of adaptability to the materials and sizes of the devices to be tested; the design of the mold with a fixed curvature radius can accurately control the bending shape of the device to be tested, and test the performance of flexible thermoelectric devices under different curvature conditions. The test results under different curvatures can provide a reliable basis for the design, optimization and application of two-dimensional flexible thermoelectric devices;

[0023] 2) The curvature radius fixed mold included in the test platform of the present invention can ensure the uniformity of the contact area between the hot and cold ends of the two-dimensional flexible thermoelectric device during the test process, thereby ensuring the accuracy of the test data;

[0024] 3) The test platform of the present invention provides a standardized and normalized test method, provides a unified standard for the output performance evaluation of different two-dimensional flexible thermoelectric devices, and significantly improves the test comparison efficiency of the device's thermoelectric performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of the output performance test platform of the two-dimensional flexible thermoelectric device in the present invention, wherein: 1. a curvature radius fixing mold; 2. an electrochemical workstation; 3. a host computer; 4. a two-dimensional flexible thermoelectric device; 5. a heating platform; 6. a cooling plate; and 7. a thermometer.

[0026] Figure 2 It is a schematic diagram of the geometrical dimension design of the curvature radius fixing mold in the present invention.

[0027] Figure 3 Schematic diagram of the structure of a two-dimensional flexible thermoelectric device to be tested in an embodiment of the present invention.

[0028] Figure 4 This is a physical picture of the two-dimensional flexible thermoelectric device output performance test platform in an embodiment of the present invention.

[0029] Figure 5 Schematic diagram of the structure of the curvature radius fixed mold in the embodiment of the present invention, wherein (a) is a design mold with a curvature radius of 30 mm, (b) is a design mold with a curvature radius of 40 mm, (c) is a design mold with a curvature radius of 50 mm, and (d) is a design mold with a curvature radius of 60 mm.

[0030] Figure 6 1 and 2 are test results of the two-dimensional flexible thermoelectric device under different curvature radii in the embodiment of the present invention, wherein (a) is the original test data and (b) is the fitting data after smoothing.

[0031] Figure 7 1 and 2 are test results of the two-dimensional flexible thermoelectric device under different temperature difference conditions between the hot and cold ends in the embodiment of the present invention, wherein (a) is the original test data and (b) is the fitting data after smoothing. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and beneficial effects of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0033] The output of two-dimensional flexible thermoelectric devices is affected by the device's bending radius of curvature and the temperature difference between the hot and cold ends, and there are obvious differences in the thermoelectric conversion performance; therefore, the two-dimensional flexible thermoelectric device output test platform needs to have the ability to control the device's bending radius of curvature and the ability to accurately adjust the temperature difference.

[0034] Based on this, this embodiment provides a two-dimensional flexible thermoelectric device output performance test platform, which can collect and analyze the thermoelectric output data of the two-dimensional flexible thermoelectric device 4 under the combination of a set curvature radius shape and a cold and hot end temperature difference; the test platform is as follows Figure 1 As shown, it includes: a curvature radius fixed mold 1, an electrochemical workstation 2, a host computer 3 and a temperature difference adjustment device; wherein the temperature difference adjustment device includes: a heating platform 5, a cooling plate 6 and a thermometer 7; the curvature radius fixed mold is arranged on the temperature difference adjustment device, and the two-dimensional flexible thermoelectric device 4 to be tested is fitted on the curvature radius fixed mold, so that it works under the bending condition of a predetermined curvature radius; the heating platform and the cooling plate are arranged along the same horizontal plane, the heating platform heats the hot end of the two-dimensional flexible thermoelectric device through the curvature radius fixed mold, the cooling plate cools the cold end of the two-dimensional flexible thermoelectric device through the curvature radius fixed mold, and the cold end temperature and the hot end temperature of the two-dimensional flexible thermoelectric device are monitored by the thermometer, so that it works under the predetermined cold and hot end temperature difference condition; the electrochemical workstation 2 collects the output data of the two-dimensional flexible thermoelectric device to be tested, and completes data processing through the host computer 3 to obtain the output performance index of the two-dimensional flexible thermoelectric device.

[0035] The curvature radius fixed mold 1 is composed of a pair of strip molds with the same structure and size, the cross-section of the strip mold is a right-angled triangle, and the hypotenuse of the right-angled triangle is arc-shaped; the two strip molds are symmetrically arranged on the heating table and the cooling plate of the temperature difference adjustment device, and the arc-shaped outer surfaces of the two strip molds are located on the arc surface of the predetermined curvature radius; during the test, the two-dimensional flexible thermoelectric device 4 to be tested is symmetrically fixed on the curvature radius fixed mold, and the two-dimensional flexible thermoelectric device is fixed under the predetermined bending curvature radius condition by the curvature radius fixed mold, and it is ensured that the cooling area of ​​the fixed two-dimensional flexible thermoelectric device is the same as the heating area.

[0036] Furthermore, from the working principle, the curvature radius fixing mold 1 should ensure that the two-dimensional flexible thermoelectric device is fixed to a predetermined curvature radius condition, and ensure that the cooling area and the heating area of ​​the fixed two-dimensional flexible thermoelectric device 4 are the same; therefore, the arc surface geometric parameters of the curvature radius fixing mold in the present invention are designed as follows: Figure 2 As shown, for two-dimensional flexible thermoelectric devices, in order to ensure that the contact area between the hot and cold ends of the device is the same under different curvature radii, the arc It should remain constant at any radius of curvature, and The radius of curvature is defined as the radius length of the circle where the arc surface of the curvature radius fixed mold is located, such as Figure 2 The line segment AB shown in Figure 2 According to the geometric relationship described in the design diagram, after the curvature radius is set a priori, the design dimensions of the lateral length DG and the longitudinal height GC of the curvature radius fixed mold can be calculated accordingly; based on this curvature radius fixed mold, it can ensure that the two-dimensional flexible thermoelectric device is fixed at a predetermined curvature radius, and the contact area between the cold end and the hot end is the same.

[0037] Furthermore, the curvature radius fixing mold 1 is made of metal material, and aluminum is preferably used according to the thermal conductivity and manufacturing difficulty of the metal material.

[0038] The electrochemical workstation 2 is connected to the two-dimensional flexible thermoelectric device 4 to collect output data of the two-dimensional flexible thermoelectric device 4; in the embodiment, the electrochemical workstation 2 uses linear voltammetry to measure the output voltage of the two-dimensional flexible thermoelectric device. The electrochemical workstation is connected to both ends of the two-dimensional flexible thermoelectric device 4, and obtains corresponding output voltage response data by applying a scanning current to form a voltage-current data pair, which is transmitted to the host computer 3 in real time through a data transmission line.

[0039] The host computer 3 is connected to the electrochemical workstation 2 via a data transmission line, receives and stores the voltage-current data pairs of the two-dimensional flexible thermoelectric device sent by the electrochemical workstation in real time, and then converts the voltage-current data into power-current data according to the power calculation formula, thereby obtaining the output power curve of the two-dimensional flexible thermoelectric device 4 to be tested, and finally calculates the output performance index of the two-dimensional flexible thermoelectric device 4 to be tested according to the output power curve.

[0040] Furthermore, the output performance index of the two-dimensional flexible thermoelectric device 4 to be tested is defined as:

[0041]

[0042] Where DP represents the peak output power per unit area and unit temperature of the two-dimensional flexible thermoelectric device, P peak is the output power peak of the two-dimensional flexible thermoelectric device, S is the area of ​​the two-dimensional flexible thermoelectric device, and ΔT is the temperature difference between the hot and cold ends of the two-dimensional flexible thermoelectric device.

[0043] Based on the above test platform, this embodiment also provides a method for testing the output performance of a flexible two-dimensional thermoelectric device, which specifically includes the following steps:

[0044] S1, placing the flexible two-dimensional thermoelectric device 4 to be tested on the curvature radius fixed mold 1, and using tape to symmetrically fix the two-dimensional flexible thermoelectric device on the curvature radius fixed mold 1, so that the device surface is in close contact with the curved surface, so that the two-dimensional flexible thermoelectric device is under a predetermined curvature radius R0;

[0045] S2, adjusting the temperature difference between the hot and cold ends of the two-dimensional flexible thermoelectric device 4 by the temperature difference adjustment device, setting the temperature of the heating platform 5 and the cooling plate 7, and running for 10 minutes to stabilize the temperature difference between the hot and cold ends to ΔT0, that is, the two-dimensional flexible thermoelectric device works under the condition of the temperature difference between the hot and cold ends ΔT0;

[0046] S3, setting the electrochemical workstation 2 to linear voltammetry measurement, obtaining the corresponding output voltage response data by applying a scanning current, forming a voltage-current data pair, and transmitting it to the host computer in real time through the data transmission line; after the host computer completes the data processing, the output performance index of the flexible two-dimensional thermoelectric device under the combination condition (R0, ΔT0) is obtained;

[0047] S4, adjusting the temperature difference between the hot and cold ends of the two-dimensional flexible thermoelectric device to ΔT1, ΔT2, ΔT3, ..., ΔT M Repeat step S3 to obtain the flexible two-dimensional thermoelectric device under the combined condition (R0, ΔT m ) output performance index under, m = 0, 1, 2, 3, ..., M;

[0048] S5, replace the curvature radius fixing mold, so that the two-dimensional flexible thermoelectric device is at the predetermined curvature radius R1, R2, R3, ..., R N Repeat steps S3 and S4 to obtain the flexible two-dimensional thermoelectric device under the combined condition (R n ,ΔT m ), n=0,1,2,3,...,N, m=0,1,2,3,...,M.

[0049] Specifically, this embodiment takes the typical two-dimensional flexible thermoelectric device shown in Figure 3 as an example to test the output performance. Figure 3 As shown in the figure, the two-dimensional flexible thermoelectric device forms a thermoelectric module by combining multiple thermocouple pairs of n-type and p-type semiconductors. One side of the thermoelectric module is exposed to high temperature and the other side is exposed to low temperature, forming the Seebeck effect. The diffusion of electrons and holes causes an electromotive force to be generated between the two sides. The actual test platform for the output performance test of the flexible two-dimensional thermoelectric device is shown in the figure. Figure 4As shown, the flexible thermoelectric device is fixed on a curvature radius fixed mold with PI tape to ensure that the contact area between the two-dimensional flexible thermoelectric device to be tested and the cold end and the hot end is equal, and the two ends of the sensitive thermometer are fixed to measure the contact area between the device to be tested and the cold end and the hot end respectively; according to the above test method, under the given bending curvature radius and temperature difference test conditions, the output data of the device to be tested is tested; the output end of the device to be tested is connected to the electrochemical workstation for linear voltammetry measurement, the measurement amplitude is set to 0.2mV / s, the sampling frequency is 1Hz, and the voltage-current curve data is saved and processed.

[0050] In this embodiment, the predetermined curvature radius shapes designed for the performance test of the flexible two-dimensional thermoelectric device to be tested are 30 mm, 40 mm, 50 mm, and 60 mm, forming multiple groups of replaceable modules, such as Figure 5 As shown in (a), (b), (c) and (d); in order to ensure that the two-dimensional flexible thermoelectric device to be tested has sufficient contact area with the curvature radius fixed mold, the width of the curvature radius fixed mold is preferably designed to be 70 mm; the predetermined curvature radius parameter is used to cover the performance test of the wearable device, to simulate most of the curvature radii of the human body geometry, so as to standardize the performance test of the wearable flexible two-dimensional thermoelectric device.

[0051] like Figure 6 As shown in FIG. 1 , the output performance of the two-dimensional flexible thermoelectric device to be tested is tested under different curvature radii. During the test, the temperature of the heating stage is set to 60°C, the temperature of the cooling plate is set to 10°C, and the test is run for 10 minutes so that the temperature difference between the hot and cold ends is maintained at a stable 50°C. Under this condition, the voltage-current data of the device to be tested under curvature radii of 30mm, 40mm, 50mm, and 60mm are measured, and the raw data of the output power-scanning current is processed as shown in FIG. Figure 6 As shown in (a), the fitting data after smoothing is as follows Figure 6 As shown in (b).

[0052] like Figure 7 As shown in FIG. 1 , the output performance of the two-dimensional flexible thermoelectric device to be tested is tested under different cold-hot end temperature difference conditions; during the test, the device curvature radius is fixed to 40 mm, the cold-hot end temperature difference is set to 30° C., 40° C., and 50° C., and the voltage-current data is measured and processed to obtain the raw data of output power-scanning current as shown in FIG. Figure 7 As shown in (a), the fitting data after smoothing is as follows Figure 7 As shown in (b).

[0053] The test results show that under the same curvature, the output power of the two-dimensional flexible thermoelectric device increases with the increase of the temperature difference between the hot and cold ends, which is in line with the basic principle of the thermoelectric effect; under the same temperature difference between the hot and cold ends, different curvature radii have a significant impact on the output performance of the two-dimensional flexible thermoelectric device; therefore, based on the present invention, a two-dimensional flexible thermoelectric device output performance test platform and a test method thereof are provided, which can perform standardized measurement of the output performance (power) of the two-dimensional flexible thermoelectric device under different curvature radii and different hot and cold end temperature differences, achieve efficient and accurate performance evaluation, and provide a reliable basis for the design, optimization and application of two-dimensional flexible thermoelectric devices.

[0054] The above description is only a specific implementation mode of the present invention. Any feature disclosed in this specification, unless otherwise stated, can be replaced by other alternative features that are equivalent or have similar purposes; all the disclosed features, or all the steps in the methods or processes, except for mutually exclusive features and / or steps, can be combined in any way.

Claims

1. A two-dimensional flexible thermoelectric device output performance test platform, comprising: A curvature radius fixed mold (1), an electrochemical workstation (2), a host computer (3) and a temperature difference adjustment device; characterized in that the temperature difference adjustment device comprises: a heating platform (5), a cooling plate (6) and a thermometer (7); the curvature radius fixed mold is arranged on the temperature difference adjustment device, and the two-dimensional flexible thermoelectric device (4) to be tested is arranged on the curvature radius fixed mold so that it works under a bending condition of a predetermined curvature radius; the heating platform heats the hot end of the two-dimensional flexible thermoelectric device through the curvature radius fixed mold, and the cooling plate cools the cold end of the two-dimensional flexible thermoelectric device through the curvature radius fixed mold, and the heating area and the cooling area of ​​the two-dimensional flexible thermoelectric device are the same, and the cold end temperature and the hot end temperature of the two-dimensional flexible thermoelectric device are monitored by the thermometer so that it works under a predetermined cold and hot end temperature difference condition; the electrochemical workstation collects output data of the two-dimensional flexible thermoelectric device to be tested, and completes data processing through the host computer to obtain the output performance index of the two-dimensional flexible thermoelectric device.

2. The two-dimensional flexible thermoelectric device output performance test platform according to claim 1, characterized in that: The heating platform and the refrigeration plate are arranged along the same horizontal plane.

3. The two-dimensional flexible thermoelectric device output performance test platform according to claim 1, characterized in that: The curvature radius fixed mold is composed of a pair of strip molds with the same structure and size, the cross-section of the strip mold is a right-angled triangle, and the hypotenuse of the right-angled triangle is an arc; the two strip molds are symmetrically arranged on the heating table and the cooling plate of the temperature difference adjustment device, and the arc-shaped outer surfaces of the two strip molds are located on the arc surface of the predetermined curvature radius.

4. The two-dimensional flexible thermoelectric device output performance test platform according to claim 1, characterized in that: The curvature radius fixing mold is made of metal material, preferably aluminum.

5. The two-dimensional flexible thermoelectric device output performance test platform according to claim 1, characterized in that: The electrochemical workstation uses linear voltammetry to measure the output voltage of the two-dimensional flexible thermoelectric device. The electrochemical workstation is connected to the two ends of the two-dimensional flexible thermoelectric device, and obtains corresponding output voltage response data by applying a scanning current to form a voltage-current data pair, which is transmitted to a host computer in real time through a data transmission line.

6. The two-dimensional flexible thermoelectric device output performance test platform according to claim 1, characterized in that: The host computer receives and stores the voltage-current data pairs of the two-dimensional flexible thermoelectric device sent by the electrochemical workstation in real time, converts the voltage-current data into power-current data according to the power calculation formula, obtains the output power curve of the two-dimensional flexible thermoelectric device to be tested, and finally calculates the output performance index of the two-dimensional flexible thermoelectric device according to the output power curve.

7. The two-dimensional flexible thermoelectric device output performance testing platform according to claim 6, characterized in that: The output performance index of the two-dimensional flexible thermoelectric device is defined as: Where DP represents the peak output power per unit area and unit temperature of the two-dimensional flexible thermoelectric device, P peak is the output power peak of the two-dimensional flexible thermoelectric device, S is the area of ​​the two-dimensional flexible thermoelectric device, and ΔT is the temperature difference between the hot and cold ends of the two-dimensional flexible thermoelectric device.

8. The testing method of the two-dimensional flexible thermoelectric device output performance testing platform according to claim 1 comprises the following steps: S1, placing the flexible two-dimensional thermoelectric device to be tested on a mold with a fixed curvature radius, so that the two-dimensional flexible thermoelectric device is under a predetermined curvature radius R0; S2, adjusting the temperature difference between the hot and cold ends of the two-dimensional flexible thermoelectric device by a temperature difference adjustment device, so that the two-dimensional flexible thermoelectric device is under the condition of a temperature difference between the hot and cold ends ΔT0; S3, collecting the output data of the two-dimensional flexible thermoelectric device to be tested through the electrochemical workstation, and completing the data processing through the host computer to obtain the output performance index of the flexible two-dimensional thermoelectric device under the combined condition (R0, ΔT0); S4, adjusting the temperature difference between the hot and cold ends of the two-dimensional flexible thermoelectric device to ΔT1, ΔT2, ΔT3, ..., ΔT M Repeat step S3 to obtain the flexible two-dimensional thermoelectric device under the combined condition (R0, ΔT m ) output performance index under, m = 0, 1, 2, 3, ..., M; S5, replace the curvature radius fixing mold, so that the two-dimensional flexible thermoelectric device is at the predetermined curvature radius R1, R2, R3, ..., R N Repeat steps S3 and S4 to obtain the flexible two-dimensional thermoelectric device under the combined condition (R n ,ΔT m ), n=0,1,2,3,...,N, m=0,1,2,3,...,M.

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