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Overcurrent protection element

A technology for protecting components and overcurrent, applied in the direction of electrical components, resistor components, circuits, etc., can solve the problems of high resistance, easy to generate heat, small maintenance current, etc., to increase maintenance current, high withstand voltage, high maintenance effect of current

Active Publication Date: 2019-03-22
POLYTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional components that use carbon black as conductive filler have high resistance and low hold current, which has the disadvantage of easily generating heat

Method used

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Embodiment Construction

[0025] In order to make the above and other technical contents, features and advantages of the present invention more comprehensible, the following specifically cites relevant embodiments, together with the accompanying drawings, for a detailed description as follows.

[0026] Table 1 shows the formulation components of each embodiment (E1 to E5) and comparative examples (C1 to C3) shown in volume percentage, wherein the carbon black used as the conductive filler is the model RAVEN 430 produced by Columbian Chemical Company (Columbian Chemical Company) For ULTRA products, the tungsten carbide ceramic powder used as a conductive filler is selected from Micron Metals, Inc.'s product WP-301; among the high-molecular polymer substrates, high-density polyethylene (HDPE) is selected from Formosa Plastics, Inc. ) produced model TAISOX HDPE-8010 products. PVDF is selected from kynar 740, kynar 761, kuraha 850, and kuraha 1100 products, whose melting points are 165°C, 168°C, 173°C, and...

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Abstract

The invention discloses an overcurrent protection element. The overcurrent protection element comprises a first electrode layer, a second electrode layer and a PTC (Positive Temperature Coefficient) material layer which is stacked between the first electrode layer and the second electrode layer, wherein the PTC material layer is less than 0.05omega.cm in volume resistance value, and is prepared from a high molecular polymer substrate, conductive ceramic filler and carbon-containing conductive filler. The high-molecular polymer substrate is prepared from a fluorine-containing high-molecular polymer which is higher than 150 DEG C in melting point, and is 50 to 60 percent in volume percentage. The conductive ceramic filler is dispersed in the high-molecular polymer substrate, is 40 to 45 in volume percent, and is less than 500muomega.cm in volume resistance value. The carbon-containing conductive filler is dispersed in the high-molecular polymer substrate, and is 0.5 to 5 percent in volume percentage. A ratio of current to area of the overcurrent protection element at 25 DEG C is kept at 0.21 to 0.3A / mm<2>. A ratio of bearable power to area of the overcurrent protection element at 25DEG C is 4.8 to 7.2W / mm<2>.

Description

technical field [0001] The present invention relates to an overcurrent protection device, more particularly, to an overcurrent protection device with high hold current characteristics. Background technique [0002] Since the resistance of conductive composite materials with positive temperature coefficient (Positive Temperature Coefficient; PTC) characteristics has the characteristics of sensitive response to temperature changes, it can be used as a material for current sensing elements, and has been widely used in overcurrent protection elements or circuits. component. Because the resistance of the PTC conductive composite material can maintain an extremely low value at normal temperature, the circuit or battery can operate normally. However, when an over-current (over-current) over-temperature (over-temperature) phenomenon occurs in the circuit or the battery, its resistance value will instantly increase to a high resistance state (at least 10 4 Ω or more), the so-called...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01C7/02H01C1/084
CPCH01C1/084H01C7/021H01C7/027
Inventor 颜修哲张永贤董朕宇张耀德王绍裘
Owner POLYTRONICS TECH