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PTC THERMISTOR MEMBER AND PTC THERMISTOR ELEMENT コモンズ

外国特許コード F170008927
掲載日 2017年1月19日
出願国 世界知的所有権機関(WIPO)
国際出願番号 2016JP000923
国際公開番号 WO 2016136228
国際出願日 平成28年2月22日(2016.2.22)
国際公開日 平成28年9月1日(2016.9.1)
優先権データ
  • 特願2015-032495 (2015.2.23) JP
発明の名称 (英語) PTC THERMISTOR MEMBER AND PTC THERMISTOR ELEMENT コモンズ
発明の概要(英語) The purpose of the present invention is to provide a PTC thermistor member and a PTC thermistor element, each of which is provided with a large PTC effect and current conduction durability. A PTC thermistor element (1) comprises a PTC thermistor member (2) and electrodes (3a, 3b). The PTC thermistor member (2) comprises a matrix and conductive particles that are dispersed all over the matrix. The matrix contains an electrically insulating inorganic material. The inorganic material undergoes a phase transition of the crystal structure at a phase transition temperature, while undergoing a volume change. The conductive particles comprise first conductive particles and second conductive particles that are formed from a material different from the material of the first conductive particles. The first conductive particles are composed of particles having a melting point of 1,550°C or more. The second conductive particles are composed of a metal boride, a metal silicide, a metal carbide or particles having a melting point of less than 1,550°C.
従来技術、競合技術の概要(英語) BACKGROUND ART
PTC (Positive Temperature Coefficient of resistance) material, the temperature of the specific electrical resistivity increases sharply in the property. Therefore, for example to suppress the short-circuit current of the lithium ion secondary battery application, the application to prevent the motor overload current of the current limiting element is used as. In addition, the self-energization of the heater temperature is maintained constant is used as the material.
As the PTC material, as shown in Patent Document 1, the electrical characteristic change at a predetermined temperature the barium titanate-based ceramics is the most well known. However, ceramics such as barium titanate in the room temperature electrical resistivity is high. Therefore the power loss is large. In addition, that needs to be added to the lead by the specifications. Therefore, is a problem in terms of global environment. Furthermore, the production cost is high. Therefore, other PTC materials have been searched.
As a result, the polymer base material and a conductive material and the additive and the PTC characteristic has been found that a composite material. In this case, the PTC characteristics, in particular the temperature rapidly increases the electrical resistivity be a qualitative property. For example, to Patent Document 2, an insulator such as a crystalline polymer such as polyethylene mixed with conductive particles of the carbon composite material is disclosed. The composite material, in particular the mixing ratio of the conductive path is formed in the polymer matrix. Therefore, the increase of the conductive particles, the electric resistivity is drastically reduced due to the presence of the mixing ratio.
In such a mixing ratio of the produced composite material, the thermal expansion of the polymer of the conductive particles is much greater than the thermal expansion. Therefore, the temperature of this composite material and the voltage rises, when the crystalline polymer is dissolved in the crystalline polymer is rapidly expanded. This expanding crystalline polymer, the polymer forms a conductive path in the conductive particles are separated from each other. Therefore, the conductive path is cut off and the electric resistance is rapidly increased. Thus, expressing PTC characteristics.
On the other hand, the base material and an organic material such as polymer composite material, low heat resistance. Therefore, the heater is maintained at a high 150 °C or more of the applications does not operate stably. In addition, the conductive carbon particles is 1 Ω specific resistance, not only of the order of cm. That is, applications are very limited.
Therefore, cristobalite or tridymite conductive particles of a composite material has been developed. Cristobalite and tridymite is, in an inorganic material having high coefficient of thermal expansion. Is disclosed in Patent Document 3-5, such as a polymer composite material as the base material 2 by about one digit as compared with the low room temperature resistivity of 1 digits from a PTC thermistor member is an organic-inorganic composite is disclosed. This inorganic composite PTC thermistor member, the polymer PTC thermistor having excellent heat resistance compared with the member.
  • 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 NAGOYA UNIVERSITY
  • 発明者(英語)
  • ISHIDA YOSHIHIKO
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 DK DM DO DZ EC EE EG ES FI GB GD GE GH GM GT HN HR HU ID IL IN IR IS JP KE KG KN KP KR 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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