阅读说明：本技术 纵向结构柔性热电器件及其制作方法 (Longitudinal structure flexible thermoelectric device and manufacturing method thereof ) 是由 陈燕宁 王于波 周芝梅 王帅鹏 郁文 付振 庞振江 董广智 彭业凌 于 2020-12-10 设计创作，主要内容包括：本发明提供一种纵向结构柔性热电器件及其制造方法,属于热电应用领域。所述器件包括：上基板,具有基板电极；下基板,具有基板电极；p型热电粒子和n型热电粒子,所述p型热电粒子和所述n型热电粒子交替排布在所述上基板与所述下基板之间并与所述基板电极焊接固定,每一个p型热电粒子首尾各串接一个n型热电粒子；所述上基板沿其基板电极图案呈分割状态,且分割裂痕与其基板电极无交叉。通过上基板的分割线,使得热电器件具有一定的弯曲能力,解决了目前纵向结构热电器不具备柔性可弯曲性能的问题。(The invention provides a longitudinal structure flexible thermoelectric device and a manufacturing method thereof, belonging to the field of thermoelectric application. The device comprises: an upper substrate having a substrate electrode; a lower substrate having a substrate electrode; the p-type thermoelectric particles and the n-type thermoelectric particles are alternately arranged between the upper substrate and the lower substrate and are welded and fixed with the substrate electrodes, and each p-type thermoelectric particle is connected with one n-type thermoelectric particle in series from head to tail; the upper substrate is in a divided state along the substrate electrode pattern, and the division crack does not cross the substrate electrode. Through the parting line of the upper substrate, the thermoelectric device has certain bending capability, and the problem that the conventional thermoelectric device with a longitudinal structure does not have flexible and bendable performance is solved.)

1. A longitudinal structure flexible thermoelectric device, characterized in that the device comprises:

an upper substrate having a substrate electrode;

a lower substrate having a substrate electrode;

the p-type thermoelectric particles and the n-type thermoelectric particles are alternately arranged between the upper substrate and the lower substrate and are welded and fixed with the substrate electrodes, and each p-type thermoelectric particle is connected with one n-type thermoelectric particle in series from head to tail; the upper substrate is in a divided state along the substrate electrode pattern, and the division crack does not cross the substrate electrode.

2. The longitudinal structure flexible thermoelectric device according to claim 1, wherein the device has a plurality of pi-shaped structure divided units, each divided unit comprising at least one n-type thermoelectric particle, one p-type thermoelectric particle, and an upper substrate divided block corresponding to the n-type thermoelectric particle and the p-type thermoelectric particle.

3. The vertical structure flexible thermoelectric device according to claim 1, wherein the lower substrate is a flexible insulating plate.

4. The longitudinal structure flexible thermoelectric device of claim 1, wherein the p-type thermoelectric particles and the n-type thermoelectric particles are alternately arranged to form a series pattern of thermal circuit parallel circuits by alternately bridging the substrate electrodes.

5. A method for fabricating a longitudinal structure flexible thermoelectric device, the method comprising:

s1) preparing p-type thermoelectric particles and n-type thermoelectric particles, and preparing corresponding upper substrate having substrate electrodes and lower substrate having substrate electrodes;

s2) correspondingly and alternately arranging p-type thermoelectric particles and n-type thermoelectric particles between the upper substrate and the lower substrate along the positions of the substrate electrodes, welding and fixing the arranged p-type thermoelectric particles and n-type thermoelectric particles with the substrate electrodes, wherein each p-type thermoelectric particle is connected with one n-type thermoelectric particle in series from head to tail;

s3) dividing the upper substrate into a plurality of pi-shaped divided units along the contour line of the substrate electrode of the upper substrate, each divided unit including at least one n-type thermoelectric particle, one p-type thermoelectric particle, and an upper substrate divided block corresponding to the n-type thermoelectric particle and the p-type thermoelectric particle.

6. The method for manufacturing a vertical structure flexible thermoelectric device according to claim 5, wherein in step S1), the lower substrate is a flexible insulating plate, and the substrate material of the lower substrate is any one of polyimide film, polydimethylsiloxane and polymethyl acrylate.

7. The method for manufacturing a longitudinal structure flexible thermoelectric device according to claim 5, wherein in step S2), the welding and fixing includes:

determining a solder selection rule according to the interface bonding strength and the contact resistance between the p-type thermoelectric particles and the substrate electrodes and between the n-type thermoelectric particles and the substrate electrodes;

and selecting the corresponding solder according to the determined solder selection rule to perform the soldering fixing operation.

8. The method for manufacturing a longitudinal structure flexible thermoelectric device according to claim 5, wherein in step S2), the p-type thermoelectric particles and the n-type thermoelectric particles are alternately arranged and alternately bridged by the substrate electrodes to form a thermal circuit parallel circuit series mode.

9. The method for manufacturing a vertical structure flexible thermoelectric device according to claim 5, wherein in step S3), the upper substrate is in a divided state along the substrate electrode pattern thereof, and the division crack has no intersection with the substrate electrode thereof.

10. The method for manufacturing a vertical structure flexible thermoelectric device according to claim 9, wherein in step S3), the dividing direction of the upper substrate is selected according to the folding direction required for the thermoelectric device.

Technical Field

The invention relates to the field of thermoelectric application, in particular to a longitudinal structure flexible thermoelectric device and a manufacturing method thereof.

Background

Along with scientific and technical development and standard of living improve, convenient to carry and the wearable electronic product that the function is practical are receiving people's favor more and more, for example intelligent wrist-watch and intelligent bracelet. The wearable electronic products provide much convenience for people's life, but are influenced by the size of the products, the size of the storage battery unit of the products is often limited, the endurance capacity of the products is also limited, and users often have to choose between the extreme feelings of convenience in use and inconvenience in charging.

The thermoelectric material can directly convert heat energy into electric energy, if the electronic watch strap is directly replaced by the thermoelectric material, self-power supply of electronic products can be realized through enough expansion area of the strap and heat continuously emitted by a human body, the charging frequency of the electronic products is obviously reduced, even the electronic products are not required to be charged independently, and the use satisfaction of users is effectively improved. The thermoelectric material with the longitudinal structure is an ideal material for manufacturing the watchband due to the characteristic of high utilization rate of the heated area, but the thermoelectric devices with the longitudinal structure researched at present are rigid structures and cannot be coupled with curved heat sources such as pipelines and human arms, so that the application range of the thermoelectric devices is limited. The invention provides a longitudinal structure flexible thermoelectric device, aiming at the problem that the conventional longitudinal structure thermoelectric device does not have flexible and bendable performance.

Disclosure of Invention

The invention aims to provide a longitudinal structure flexible thermoelectric device, which at least solves the problem that the conventional longitudinal structure thermoelectric device does not have flexible and bendable performance.

In order to achieve the above object, a first aspect of the present invention provides a longitudinal structure flexible thermoelectric device, comprising: an upper substrate having a substrate electrode; a lower substrate having a substrate electrode; the p-type thermoelectric particles and the n-type thermoelectric particles are alternately arranged between the upper substrate and the lower substrate and are welded and fixed with the substrate electrodes, and each p-type thermoelectric particle is connected with one n-type thermoelectric particle in series from head to tail; the upper substrate is in a divided state along the substrate electrode pattern, and the division crack does not cross the substrate electrode.

Preferably, the device has a plurality of pi-type structured division units, each of which includes at least one n-type thermoelectric particle, one p-type thermoelectric particle, and an upper substrate division block corresponding to the n-type thermoelectric particle and the p-type thermoelectric particle.

Preferably, the lower substrate is a flexible insulating plate.

Preferably, the p-type thermoelectric particles and the n-type thermoelectric particles are alternately arranged and alternately bridged by the substrate electrodes to form a thermal path parallel circuit series mode.

The invention provides a method for manufacturing a longitudinal structure flexible thermoelectric device, which comprises the following steps: s1) preparing p-type thermoelectric particles and n-type thermoelectric particles, and preparing corresponding upper substrate having substrate electrodes and lower substrate having substrate electrodes; s2) correspondingly and alternately arranging p-type thermoelectric particles and n-type thermoelectric particles between the upper substrate and the lower substrate along the positions of the substrate electrodes, welding and fixing the arranged p-type thermoelectric particles and n-type thermoelectric particles with the substrate electrodes, wherein each p-type thermoelectric particle is connected with one n-type thermoelectric particle in series from head to tail; s3) dividing the upper substrate into a plurality of pi-shaped divided units along the contour line of the substrate electrode of the upper substrate, each divided unit including at least one n-type thermoelectric particle, one p-type thermoelectric particle, and an upper substrate divided block corresponding to the n-type thermoelectric particle and the p-type thermoelectric particle.

Preferably, in step S1), the lower substrate is a flexible insulating plate, and the substrate material of the lower substrate is any one of a polyimide film, polydimethylsiloxane and polymethyl acrylate.

Preferably, in step S2), the welding and fixing includes: determining a solder selection rule according to the interface bonding strength and the contact resistance between the p-type thermoelectric particles and the substrate electrodes and between the n-type thermoelectric particles and the substrate electrodes; and selecting the corresponding solder according to the determined solder selection rule to perform the soldering fixing operation.

Preferably, in step S2), the p-type thermoelectric particles and the n-type thermoelectric particles are alternately arranged and alternately bridged by the substrate electrodes to form a thermal circuit parallel circuit series pattern.

Preferably, in step S3), the upper substrate is divided along the substrate electrode pattern, and the division crack does not intersect with the substrate electrode pattern.

Preferably, in step S3), the dividing direction of the upper substrate is selected according to a desired folding direction of the thermoelectric device.

Through above-mentioned technical scheme, select the infrabasal plate of longitudinal structure thermoelectric device to be flexible substrate, and cut along the base plate electrode contour line of upper substrate, make under the complete condition of thermoelectric device circuit of not destroying, each adjacent pi type unit can guarantee under the fixed prerequisite of one end that the other end has certain separation ability, thereby realize thermoelectric device's flexible performance, solved present longitudinal structure thermoelectric device and did not possess the problem of flexible performance.

Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:

FIG. 1 is a block diagram of a longitudinal structure flexible thermoelectric device according to one embodiment of the present invention;

fig. 2 is a structural diagram of a thermoelectric particle series structure of a longitudinal structure flexible thermoelectric device according to an embodiment of the present invention.

Description of the reference numerals

10-a substrate electrode of an upper substrate; 20-n-type thermoelectric particles;

30-substrate electrodes of the lower substrate; 40-p type thermoelectric particles.

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

Fig. 1 is a structural view of a longitudinal structure flexible thermoelectric device according to an embodiment of the present invention. As shown in fig. 1, an embodiment of the present invention provides a longitudinal-structure flexible thermoelectric device, including: p-type thermoelectric particles 40 and n-type thermoelectric particles 20, the p-type thermoelectric particles 40 and the n-type thermoelectric particles 20 being alternately welded on the substrate electrodes 10 and 30 of the upper and lower substrates between the upper and lower substrates, respectively; the upper substrate is divided along the substrate electrode pattern, and the division crack does not intersect with the substrate electrode.

Preferably, the device has a plurality of pi-type structured division units, each of which includes at least one n-type thermoelectric particle 20, one p-type thermoelectric particle 40, and an upper substrate division block corresponding to the n-type thermoelectric particle and the p-type thermoelectric particle.

In the embodiment of the invention, thermoelectric particles can apply temperature difference to two ends of a thermoelectric device according to the principle that the temperature difference generates current, the cold end can generate electromotive force transmitted from a p-type couple to an n-type couple, and the current can be generated in the whole loop, so that thermoelectric power generation is realized. The flexible substrate is selected only to realize bending and folding of the thermoelectric device, which cannot be realized because the welding density of thermoelectric particles between the upper substrate and the lower substrate is very high, and the thermoelectric particles cannot be bent and extruded, if the thermoelectric device is bent only by means of extrusion between the thermoelectric particles and the flexible property of the flexible substrate, the thermoelectric particles are extremely easy to damage, and the final thermoelectric device loses the function of heating and power generation. Therefore, the bending of the thermoelectric device is achieved on the premise that the thermoelectric particles are not damaged and the circuit of the entire thermoelectric device is not damaged.

In order to solve the problem that the flexible bending of the conventional thermoelectric device easily causes the extrusion damage of thermoelectric particles, preferably, the upper substrate is regionally cut on the basis of the flexible substrate, and the lower substrate regions of the corresponding units are kept connected, so that each divided unit can be unfolded along a cutting line, and the substrate region connected by being fixed on the other side ensures that all the units can be unfolded but cannot be separated. The substrate is provided with corresponding electrode areas, one electrode area is connected with at least one p-type thermoelectric particle 40 and one n-type thermoelectric particle 20, and the electric potentials of the cold end and the hot end are different due to heating, so that current is generated, the p-type thermoelectric particle 40 and the n-type thermoelectric particle 20 on each electrode can be combined to be regarded as a power generation unit, and all the power generation units are connected in series to form the final thermoelectric device. Each power generation unit is set as a divided unit according to the principle of realizing that the thermoelectric device does not destroy thermoelectric particles and circuits at all. For example, one p-type thermoelectric particle 40 and one n-type thermoelectric particle 20 are welded on one electrode region, when cutting is performed, substrate cutting is performed along a frame of the electrode region, it is ensured that the electrode region is not cut, each of the dividing units comprises one electrode region, one p-type thermoelectric particle 40 and one n-type thermoelectric particle 20, if the substrate below each of the dividing units is not cut, all the dividing units can be unfolded through cutting lines, and because the lower substrate is not cut, all the units are fixed on one substrate and cannot be separated, the thermoelectric device can be bent downwards, the upper substrate is unfolded through cutting lines, and the lower substrate is bent due to flexibility. If the cutting is performed along the center of the electrode area, each thermoelectric particle is cut into independent small units, although the bending of the thermoelectric device can be realized, since the electric area is a series circuit of the thermoelectric particles, the series circuit is destroyed by destroying the electrode area, and the thermoelectric device is damaged.

Preferably, the lower substrate is a flexible insulating plate.

In the embodiment of the invention, according to the bending rule of the thermoelectric device, if only the upper substrate is cut to keep the lower substrate intact and the substrate is to be bent downward, a certain flexibility of the lower substrate must be ensured, if the upper and lower substrates are made of materials with extremely high rigidity, the thermoelectric device cannot be bent even if a cutting gap exists, and the substrate is broken due to forced bending. The substrate comprises a substrate material and an electrode area, the electrode area is a series circuit for connecting thermoelectric particles in series, and the substrate is a structural member for supporting the thermoelectric particles in the electrode area, so that the substrate area is required to be ensured to have insulating property except the electrode area, and the current loss is avoided while the safety accident is avoided. Therefore, it is necessary to ensure that the substrate is made of flexible insulating material, such as polyimide film (PI film), Polydimethylsiloxane (PDMS), and polymethyl acrylate (PMMS). However, the heat conductivity of the flexible insulating material is often poor, and if the upper and lower substrates are both selected from flexible insulating boards, the heat in the thermoelectric device cannot be dissipated as soon as possible, and the temperature of the upper substrate gradually rises. Because thermoelectric device just can produce the electric current through the certain temperature difference of upper and lower base plate formation, so if the upper substrate can't in time distribute away the heat, the temperature rises gradually, will dwindle gradually and the infrabasal plate between the temperature difference to lead to the temperature difference between the upper and lower base plate to diminish, the electric current that produces is also littleer.

The flexible thermoelectric device provided by the invention is mainly used as the electronic product watchband, so that the thermoelectric device is required to be in direct contact with the skin of a human body, and if the heat of the thermoelectric device cannot be dissipated in time, the temperature of the watchband is gradually increased, so that the use sense of the human body is influenced, and the experience sense is reduced. Therefore, it is preferable that the upper substrate is kept as a rigid insulating plate and only the lower substrate is selected as a flexible insulating plate, so that the heat dissipation performance of the thermoelectric device is not affected while the flexibility of the thermoelectric device is ensured, and the use feeling of a user is enhanced while the power generation efficiency is improved.

Preferably, the p-type thermoelectric particles 40 and the n-type thermoelectric particles 20 are arranged in a staggered manner, and the substrate electrodes alternately bridge the thermoelectric particles to form a thermal path parallel circuit series pattern.

In the embodiment of the invention, the thermoelectric device with the longitudinal structure is the most widely researched and applied thermoelectric device, and the parallel connection of the thermal circuits and the series connection of the circuits are realized through the combination of the pi-type thermoelectric pairs, so that the most full utilization of the thermal energy and the maximum accumulation of the electric energy are realized.

The embodiment of the invention also provides a manufacturing method of the longitudinal structure flexible thermoelectric device, which comprises the following steps: s1), preparing p-type thermoelectric particles 40 and n-type thermoelectric particles 20, determining the corresponding substrate material, selecting the corresponding solder according to the thermoelectric particles and the substrate material, and preparing the corresponding upper substrate with substrate electrodes and the corresponding lower substrate with substrate electrodes; s2) correspondingly and alternately arranging p-type thermoelectric particles and n-type thermoelectric particles between the upper substrate and the lower substrate along the positions of the substrate electrodes, welding and fixing the arranged p-type thermoelectric particles and n-type thermoelectric particles with the substrate electrodes, wherein each p-type thermoelectric particle is connected with one n-type thermoelectric particle in series from head to tail;

s3) dividing the upper substrate into a plurality of pi-shaped divided units along the contour line of the substrate electrode of the upper substrate, each divided unit including at least one n-type thermoelectric particle, one p-type thermoelectric particle, and an upper substrate divided block corresponding to the n-type thermoelectric particle and the p-type thermoelectric particle.

Preferably, in step S1), the p-type thermoelectric particles 40 and the n-type thermoelectric particles 20 are prepared, and the corresponding substrate material is determined, where the lower substrate is a flexible insulating plate, and the substrate material of the lower substrate at least includes any one of a polyimide film, polydimethylsiloxane, and polymethyl acrylate.

Preferably, in step S1), the selecting of the corresponding solder according to the thermoelectric particles and the substrate material includes: determining a solder selection rule according to the interface bonding strength and the contact resistance between the p-type thermoelectric particles and the substrate electrodes and between the n-type thermoelectric particles and the substrate electrodes; the thermoelectric particles and the substrate electrode are ensured to form larger interface bonding strength and smaller contact resistance.

In the embodiment of the invention, the thermoelectric particles are fixed on the electrode area of the substrate by welding, and the p-type thermoelectric particle 40 and the n-type thermoelectric particle 20 are welded on the same electrode area to form a pi-type structure, so that the thermoelectric device can be bent in a certain amount by increasing the gap of the substrate and the flexible substrate, and a certain bending performance is presented. In the subsequent use process of the thermoelectric device, each pi-shaped structure is separated from other pi-shaped structures in a certain amount during bending, so that each thermoelectric particle is exposed possibly, and the thermoelectric particles are damaged or fall off possibly due to continuous bending for multiple times. It is also required that the immobilization performance of the thermoelectric particles of the flexible thermoelectric device is higher than that of the conventional longitudinal structure thermoelectric device, i.e., a greater interface bonding strength is required. After welding, the bonding strength of an interface is influenced by a plurality of factors, the material of the welding flux is an important influence factor, on one hand, the welding flux is required to have good bonding performance with a base material and a welding material, on the other hand, the contact resistance of a welding position is required to be ensured to be small, because current passes through between thermoelectric particles and an electrode, if the contact resistance of the welding material is large, the final power generation performance of a thermoelectric device can be greatly influenced. Therefore, when selecting the solder, the material of the thermoelectric particles and the material of the electrodes must be considered, the conventional thermoelectric materials include bismuth telluride and alloy thereof, lead telluride and alloy thereof, and silicon germanium alloy, the lead telluride and alloy thereof and the silicon germanium alloy have high practical temperature and are commonly used for industrial waste heat power generation, and the bismuth telluride and alloy thereof have low applicable temperature and are ideal materials for generating power by utilizing the heat emitted by human skin. Therefore, in one possible embodiment, nickel plating and gold plating are selected as the thermoelectric particle material and copper is selected as the material for the bismuth telluride-based alloy, and gold-tin solder with the contact resistance as small as possible is selected as the solder for final fixation in order to ensure sufficient bonding strength after the thermoelectric particles are welded with the electrode. The adaptive solder is selected according to different thermoelectric materials and electrode materials, so that firm bonding between the thermoelectric materials and the electrodes is ensured as much as possible, larger interface bonding strength and smaller contact resistance are formed, and the probability of device damage caused in the later repeated bending process of the flexible thermoelectric device is reduced.

Preferably, in step S2), the alternating arrangement of the p-type thermoelectric particles 40 and the n-type thermoelectric particles 20 along the substrate electrode position of the upper substrate includes: each p-type thermoelectric particle 40 is connected with one n-type thermoelectric particle 20 in series from head to tail; all the thermoelectric particles are connected in series on the circuit and in parallel on the hot circuit.

In the embodiment of the present invention, as shown in fig. 2, a pi-type structure includes a p-type thermoelectric particle 40 and an n-type thermoelectric particle 20, and one end of the two p-type thermoelectric particles 40 and one end of the two n-type thermoelectric particles 20 are soldered in an electrode region, and the other end is not connected. The other ends of the n-type thermoelectric particles 20 and the p-type thermoelectric particles 40 in the pi-type structure are correspondingly connected with the other adjacent p-type thermoelectric particles 40 and the other adjacent n-type thermoelectric particles 20, and an inverted pi-type structure is formed respectively, so that each p-type thermoelectric particle 40 is connected with one n-type thermoelectric particle 20 in series end to end, and similarly, each n-type thermoelectric particle 20 is also connected with one p-type thermoelectric particle 40 in series end to end. All the thermoelectric particles are in series connection on the circuit, and the whole thermoelectric device has only one negative electrode port and one positive electrode port. In order to increase the binding face between the thermoelectric device and the heating object and improve the heat collection efficiency, one end of each thermoelectric particle is bonded with the surface of the heating object, the hot end and the cold end of each thermoelectric particle are arranged, the thermoelectric particles are connected in parallel on a hot circuit, the generated current is gathered through a series circuit, and the heat collection efficiency and the power generation efficiency of the thermoelectric device are improved.

Preferably, in step S3), the dividing the upper substrate along the substrate electrode contour line into a plurality of pi-shaped divided cells includes: ensuring that the substrate with at least one end fixedly connected with the two thermoelectric particles of one pi-shaped unit is not cut; the cutting line and the electrode have no cross point, the electrode is not damaged after cutting, and the circuit is kept smooth.

In the embodiment of the present invention, it can be known that the electrode regions of the upper substrate and the electrode regions of the lower substrate are not in a facing relationship but in a staggered relationship by the series connection relationship of the pyroelectric particle circuits. Therefore, when the substrate is cut, the upper substrate and the lower substrate cannot be cut in the opposite positions, because the electrical edge cutting line of the upper substrate and the electrode area of the lower substrate are projected to a plane and have a cross relationship, if the cutting is performed along the same path, the electrode of one of the upper substrate and the lower substrate is inevitably damaged, and the thermoelectric device fails. Even if the damage of the electrodes is not considered, the upper and lower substrates are cut along the same path, each pi-shaped structure can be thoroughly divided, the whole thermoelectric device cannot be connected, when the upper and lower substrates are cut simultaneously, the thermoelectric particles are cut along the outline of the electrodes, the head-to-tail connection of the thermoelectric particles is ensured, and the series circuit is not damaged.

Preferably, the cutting direction of the upper substrate is selected according to a desired folding direction of the final thermoelectric device.

In the embodiment of the invention, the bending direction and the bending degree of the thermoelectric device are determined by actual use conditions, for example, when the thermoelectric device is applicable as a watchband, the thermoelectric device is required to be bent along the length direction of the watchband, and the bending degree is large, and when the thermoelectric device is arranged along a bent tubular heating component, the thermoelectric device is required to be bent along two directions, and the bending radian is determined by the section radius and the bending radius of the tubular component. After the substrate is cut along the electrode area, the thermoelectric particles can be properly exposed in the bending process, so that the cutting of the substrate is reduced as much as possible on the premise of meeting applicable conditions, the service life of the flexible thermoelectric device can be prolonged, and the cutting procedures are reduced. The bending direction of the flexible thermoelectric device is perpendicular to the direction of the cutting line, that is, when the thermoelectric device is bent in the length direction, the substrate needs to be cut in the width direction. For example, the flexible thermoelectric device needs to be bent inward along the length direction, the electrode area of the upper substrate is distributed along the length direction, i.e. the pi-type structure series circuit is arranged along the length direction, and the width direction has the other pi-type structures arranged along the length direction except the pi-type structure arranged transversely at the end of the thermoelectric device. Because the thermoelectric device needs to be bent inwards along the length direction, the substrate electrode 10 of each substrate on the pi-shaped structure is cut along the transverse edge, the pi-shaped structures in each transverse row are fixedly connected and form a plurality of separable pi-shaped structure transverse rows, and therefore the thermoelectric device can be bent inwards along the length direction of the thermoelectric device. By analogy, according to the application rule of the flexible thermoelectric device, the cutting rule of the substrate of the flexible thermoelectric device is determined, so that the cutting process is reduced and the service life of the thermoelectric device is prolonged while the application performance is ensured.

In a possible embodiment, it is necessary to prepare a 16X 2mm²The wearable longitudinal structure flexible thermoelectric device comprises the following manufacturing steps: coating copper on two sides of a PI film, and etching the electrode pattern to manufacture a flexible substrate; cutting the compact p-type and n-type bismuth telluride thermoelectric materials into pieces, and then carrying out surface metallization treatment on the pieces by nickel plating and gold plating to ensure that the thicknesses of the treated pieces are consistent (the thickness is controlled to be 0.5mm in the example); the resulting metallized sheet was cut into particles (in this example, the particles were cut to a size of 0.43 x 0.43mm 2); the obtained particles are alternately arranged according to p type and n type, the arrangement pattern is consistent with the electrode pattern, and the relative positions of the particles correspond to the electrode welding spots one by one; appropriate amount of AuSn welding flux is dotted on the electrode welding points of the upper substrate and the lower substrate, and two ends of the arranged thermoelectric particles are respectively welded with the substrate electrodes 30 of the upper substrate and the lower substrate; and cutting the upper substrate of the thermoelectric device with good welding according to the electrode pattern without damaging the electrode. And obtaining the final flexible thermoelectric device, wherein the minimum bending curvature radius of the device can reach 9 mm. The resulting 16X 2mm are then²The power generation capability of the longitudinal structure flexible thermoelectric device is tested, the temperature of the hot end of the device is 33 ℃, the power generation performance of the device is respectively tested when the temperature difference is 1 ℃, 3 ℃, 5 ℃, 10 ℃ and 20 ℃, wherein the open-circuit voltage of the device can reach 155.1mV under the temperature difference of 20 ℃, and the maximum output power can reach 0.81 mW.

While the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solution of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and the simple modifications are within the scope of the embodiments of the present invention. It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention will not be described separately for the various possible combinations.

In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as disclosed in the embodiments of the present invention as long as it does not depart from the spirit of the embodiments of the present invention.