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Over current protecting element

A technology for protecting components and overcurrent, which is applied to electrical components, current-responsive resistors, circuits, etc., can solve problems such as rising room temperature resistance, low room temperature resistivity, inability to meet device miniaturization, low room temperature resistance, etc., and achieve electric The effect of stable performance and low room temperature resistance

Inactive Publication Date: 2006-05-03
SHANGHAI CHANGYUAN WAYON CIRCUIT PROTECTION CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the existing disclosed technology, the most common is to use carbon black as a conductive filler material, but it is difficult to obtain a very low room temperature resistivity by using carbon black as a conductive polymer prepared by a conductive filler material, especially the polymer When used to prepare overcurrent protection components for batteries (packs), it will not be able to meet the requirements of device miniaturization and low room temperature resistance
Although the conductive polymer with lower room temperature resistivity can be prepared by using metal particles as the conductive filling material, the overcurrent protection element prepared with this type of conductive polymer has poor reproducibility of its room temperature resistance, specifically, That is, through the on-off current cycle test, the room temperature resistance of the component will gradually increase with the increase of the number of cycles until it fails

Method used

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Embodiment

[0013] Example: such as figure 1 The structural diagram of the overcurrent protection element of the present invention is shown as an overcurrent protection element with positive temperature coefficient characteristics, and metal foil electrodes 3, 3' are composited on both sides of the conductive polymer layer to form a composite chip, wherein the The conductive polymer has a three-layer structure, the middle layer is composed of a conductive metal particle-filled polymer matrix 1, and the upper and lower layers are composed of a carbon black-filled polymer matrix 2, 2', and the carbon black-filled polymer layer 2 , 2' are in close contact with metal foil electrodes 3, 3'.

[0014] The manufacturing method is: mix high-density polyethylene (BHB5012, Phillips Petroleum) and nickel powder (CNP525, INCO) with a weight ratio of 1:5 in an internal mixer at 190 ° C, and pull them out on an open mixer. Sheet 1 with a thickness of 0.6mm ± 0.2mm is for later use; dissolve 300 grams o...

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Abstract

The invention provides a current foldback component with positive temperature factor character and ití»s preparing method. The current foldback component with positive temperature factor character forms the duplex chip on the two sides of the conducting polymer layer duplex mental foil electrode, wherein the conducting polymer has three layers, the middle layer is formed by conducting mental particle padding materials; the upper and lower sides are formed by carbon black padding polymer which is connected with the mental foil electrode.

Description

technical field [0001] The invention relates to an overcurrent protection element, in particular, the invention relates to an overcurrent protection element with a positive temperature coefficient (PTC) characteristic. Background technique [0002] A conductive polymer composed of a polymer and a conductive filler material dispersed in the polymer and an overcurrent protection element prepared from the conductive polymer with a positive temperature coefficient (PTC) characteristic are well known. Usually, the PTC conductive polymer is composed of one or more crystalline polymers and a conductive filling material, and the conductive filling material is uniformly dispersed in the polymer. The conductive filling material can be one of polyethylene, ethylene copolymer, fluoropolymer or a mixture of several of them; the conductive filling material can be carbon black, metal particles or inorganic ceramic powder. The PTC characteristic (increase in resistance value as temperature...

Claims

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Application Information

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IPC IPC(8): H01C7/13H01C7/02H01C17/00
Inventor 侯李明王军杨兆国
Owner SHANGHAI CHANGYUAN WAYON CIRCUIT PROTECTION CO LTD