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Over-current protection element

A technology for protecting components and overcurrent, applied in electrical components, emergency protection circuit devices for limiting overcurrent/overvoltage, emergency protection circuit devices, etc., can solve the problems of low conductivity of carbon black and low resistance value

Active Publication Date: 2016-02-10
POLYTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conductivity provided by carbon black is low, which does not meet the needs of low resistance in the application

Method used

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Embodiment Construction

[0025] The electrical conductivity of the conductive composite depends on the type and content of the conductive filler. In recent years, for consumer electronic products, the proportion of extending the service life of reusable batteries (such as lithium batteries) or single-use batteries (such as carbon-zinc batteries) has increased year by year. Since the conductivity provided by carbon black is lower than that of metal or ceramic fillers, the present invention adds conductive carbonized ceramic fillers to increase the conductivity. However, since the conductive carbonized ceramic filler forms a conductive path in a stacked manner, when the crystalline polymer in the composite material is heated, recrystallization occurs, which reduces the conductive path of the ceramic filler in the material, causing the conductive composite material to repeatedly occur. When the current (over-current) or repeated over-temperature (over-temperature) events, the resistance repeatability rat...

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Abstract

The invention discloses an over-current protection element comprising two foil sheets and a PTC material layer. The PTC material layer is laminated between the two foil sheets. The volume resistance of the PTC material layer is 0.07-0.45 omega*cm. The PTC material layer comprises at least one crystalline polymer, a first conductive filler and a second conductive filler. The first conductive filler is carbon black powder. The volume resistance of the second conductive filler is less than 0.1 omega*cm. The second conductive filler is metal powder or conductive ceramic powder or the combination of the metal powder and the conductive ceramic powder. The first and second conductive fillers are uniformly dispersed in the crystalline polymer. The weight ratio of the second conductive filler to the first conductive filler is less than 4. The resistance reproducibility R300 / Ri of the over-current protection element is 1.5-5. The upper and lower foil sheets can be connected to a power source to form a conductive circuit, the PTC material layer works in an over-current state, and therefore the circuit is protected.

Description

technical field [0001] The invention relates to an overcurrent protection element, in particular to an overcurrent protection element with low resistivity, good resistance reproducibility and excellent cycle life test results. Background technique [0002] Since the resistance of conductive composite materials with positive temperature coefficient (PositiveTemperatureCoefficient; PTC) characteristics responds sensitively to temperature changes, it can be used as a material for current sensing elements and has been widely used in overcurrent protection elements or circuit elements. 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 or over-temperature phenomenon occurs in the circuit or battery, its resistance value will instantly increase to a high resistance state (at least 10 2 Ω or more), and reduce the excessive current to ac...

Claims

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Application Information

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IPC IPC(8): H01C7/02H01C7/13
CPCH01C7/027H01C17/0652H01C17/06553H01C17/06566H01C17/06586H01C7/008H01C7/021H01C7/028H02H9/026
Inventor 陈国勋曾于轩沙益安
Owner POLYTRONICS TECH