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FUNCTIONAL ELEMENT HAVING CELL SERIAL STRUCTURE OF π-TYPE THERMOELECTRIC CONVERSION ELEMENTS, AND METHOD FOR FABRICATING SAME

外国特許コード F180009373
整理番号 (S2016-1027-N0)
掲載日 2018年4月19日
出願国 世界知的所有権機関(WIPO)
国際出願番号 2017JP032179
国際公開番号 WO 2018047882
国際出願日 平成29年9月6日(2017.9.6)
国際公開日 平成30年3月15日(2018.3.15)
優先権データ
  • 特願2016-173221 (2016.9.6) JP
発明の名称 (英語) FUNCTIONAL ELEMENT HAVING CELL SERIAL STRUCTURE OF π-TYPE THERMOELECTRIC CONVERSION ELEMENTS, AND METHOD FOR FABRICATING SAME
発明の概要(英語) Provided is a functional element resistant to disconnection, comprising a structure for obtaining a flexible thermoelectric device with a sufficient thickness for obtaining a temperature difference, the structure having a textile structure in which threads configured from thermoelectric material are stitched into a flexible insulating base material having a small thermal conductivity. In an element structure, a plurality of serial structures of π-type thermoelectric conversion cells that utilize a temperature difference in the thickness direction of an insulating base material are arranged in parallel, the element structure having a topology in which, at portions where p-type and n-type are switched, stages that have the same potential during electric power generation are electrically connected, wherein the π-type thermoelectric conversion cells are connected as electric circuits both lengthwise and widthwise in a mesh via serial connection and parallel connection. In this way, a functional element can be provided that is not susceptible to deterioration in output characteristics due to disconnection. Specifically, an n-type spun yarn and a p-type spun yarn comprising an electrically conductive fibrous substance are stitched into a sheet of insulating base material alternately and in parallel, wherein the n-type spun yarn and the p-type spun yarn are electrically connected when respectively alternately penetrating through a front surface and a back surface of the insulating base material.
従来技術、競合技術の概要(英語) BACKGROUND ART
In recent years, around the body of the non-use is used for recovering the energy, energy harvesting is attracting attention. Among such techniques, the heat recovery and converts it to electric energy conversion technology is expected to be large. The total amount of energy used in the efficiency of exhaust heat 70% is not utilized from that of the invention. However, the area of the conventional thermoelectric conversion element of high bit unit cost is difficult to obtain an economic benefit for the operation of the reasons, to have a limiting use are greeted. Therefore, a large area can be used at a low cost, flexibility in a variety of shapes corresponds to the surface of a large area to reduce the weight and the flexible thermoelectric device is realized, the purpose of use may be widely spread. For example, such as smart sensor network used in a self-distributed power supply and, due to the temperature used for the drive power of the small electric device can be expected.
From such a background organic material or an organic-inorganic composite material is attracting attention as a promising thermoelectric material is started, with the development of the study has been greatly improved and the performance. However, the transistor electrode is originally many organic materials, solar cells can be used as the material has been developed in mind. Therefore, the use of a thin and generally, the thermoelectric device is a necessary and sufficient thickness to obtain a high quality thermoelectric conversion material is not easy.
In general, the performance of the thermoelectric conversion material, the power factor PF (=α2 σ) and the dimensionless performance index ZT (=α2 σ T/ κ) are evaluated. Here, α is the Seebeck coefficient, σ is conductivity, κ is thermal conductivity, T is the absolute temperature is. Power factor PF is, the thermoelectric conversion material obtained from the corresponding power, the dimensionless performance index ZT is, corresponds to the energy conversion efficiency, both the larger value is better the performance as the thermoelectric conversion materials. The conversion efficiency of the thermoelectric conversion element, is only ideally determined by ZT, does not depend on the device structure.
Which is angled in a steady state temperature difference Δ T, all of the heat flow through the thermoelectric material to a low temperature side flow is derived based on the assumption that the index and, in an actual device as well as the material is Δ T is also dependent on the device structure, when the thickness is smaller as the thermal conductivity increases Δ T. In other words, the dimensionless performance index ZT value independent of the structure of the device is, the actual device output and efficiency of the thermoelectric device will be largely dependent on the structure. For example, 37°C temperature, 22°C of the outside air temperature to the interface of a difference between a temperature of 15°C, thermal conductivity and is bonded to the device of 0.1W/mK, the temperature difference is 10°C in order to have a thickness of about 5mm is required. If a small thickness is 200μm, the temperature difference of about 1°C cannot only. In the vicinity of room temperature and the temperature difference is the efficiency of the thermoelectric device, from the substantially linear relationship, the thickness of the thermoelectric device and the relationship between the efficiency of the heat, the temperature difference between the thickness is increased and approaches 15°C, the thermoelectric efficiency is saturated. In order to obtain high thermal efficiencies, the thermoelectric device is necessary to have a sufficient film thickness.
In particular, the heat generated by the Seebeck effect electromotive force and the cold side of the device from the hot side temperature is proportional to the difference, a sufficient temperature differential can be attached to the device becomes important. However, the interface between the atmosphere and the cold side of the device is due to the presence of convective heat resistance, high temperature heat flow from the side of the dammed, a thin film shape in most temperature (several hundred µm) that is the difference in the conditions. In addition, the film thickness of the millimeter order in the thin film material of the film formation difficult. Of the flexible thermoelectric device, the thin film material can be used, and its thickness is 200μm or less, a practical high output is obtained is difficult.
Therefore, the in-plane direction of the thermoelectric device provided with a temperature difference (for example, see Non-Patent Document 1), or, by stacking a thin film of the thermoelectric device a temperature difference to the thickness direction (for example, see Non-Patent Document 2). The former is many, that is, the temperature difference between the in-plane direction with respect to the method of the invention may be used, in this method the flexible thermoelectric device applications such as medical monitoring or considered as a smart building of the distributed power source cannot be used as, limited to the use which is problematic. In addition, the latter, that is, the temperature difference in the thickness direction are attached to the method, it is difficult to control the thickness of the film, and a substrate are required, for many of the heat flow flowing through the substrate, and a decrease in efficiency which is problematic.
On the other hand, the thermoelectric device to form the fabric structure has been known. For example, fire-resistant fabric of the garment used as the dose of the protection, a quantitative measure of the ambient temperature thermocouple capable of containing (see Patent Document 1) is the fabric. This is, a plurality of warp and the intersection of the plurality of weft yarns woven, warp or weft threads between the between the between the, at least one pair of the first thermocouple element line and the second thermocouple element lines are woven into a fabric containing a thermocouple. That is, the thermocouple wire between the woven yarns incorporating the present invention. In addition, so as to be oriented substantially in the weft direction of the wire formed by a plurality of the thermoelectric structure network (see Patent Document 2) is. In addition, the insulating fiber warp, thermocouple 2 is formed of a metal fiber and metal fiber X and Y are alternately woven as the weft, metal fiber and metal fiber wefts as a whole from the X and Y to form a thermopile of the thermoelectric conversion material has been known (see Patent Document 3).
In the case of the thermoelectric device of Patent Document 1, the electrode must be formed, metal lines are used to significantly reduce the efficiency of heat from the is a problem. In addition, in the case of a thermoelectric structure of Patent Document 2, as the thermocouple and contemplates the use, π-type structure does not have a thermoelectric efficiency can be is a problem. Further, the thermoelectric device of Patent Document 1 and Patent Document 2 and Patent Document 3 of the thermoelectric structure of all of the thermoelectric conversion material, providing a temperature difference between the structure and the in-plane direction, in the thickness direction is not provided with a structure.
  • 出願人(英語)
  • ※2012年7月以前掲載分については米国以外のすべての指定国
  • NATIONAL UNIVERSITY CORPORATION NARA INSTITUTE OF SCIENCE AND TECHNOLOGY
  • 発明者(英語)
  • NAKAMURA, Masakazu
  • ITO, Mitsuhiro
  • KOIZUMI, Takuya
国際特許分類(IPC)
指定国 National States: AE AG AL AM AO AT AU AZ BA BB BG BH BN BR BW BY BZ CA CH CL CN CO CR CU CZ DE DJ DK DM DO DZ EC EE EG ES FI GB GD GE GH GM GT HN HR HU ID IL IN IR IS JO JP KE KG KH KN KP KR KW KZ LA LC LK LR LS LU LY MA MD ME MG MK MN MW MX MY MZ NA NG NI NO NZ OM PA PE PG PH PL PT QA RO RS RU RW SA SC SD SE SG SK SL SM ST SV SY TH TJ TM TN TR TT TZ UA UG US UZ VC VN ZA ZM ZW
ARIPO: BW GH GM KE LR LS MW MZ NA RW SD SL SZ TZ UG ZM ZW
EAPO: AM AZ BY KG KZ RU TJ TM
EPO: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
OAPI: BF BJ CF CG CI CM GA GN GQ GW KM ML MR NE SN ST TD TG
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