Protective device

A technology for protecting components and PTC components, which is applied in the direction of electrical components, slender resistance components, resistor parts, etc., can solve the problems of not being able to protect components, and achieve the effects of simple structure, low abnormal temperature rise, and small size

Inactive Publication Date: 2009-06-03
TYCO ELECTRONICS RAYCHEM BVBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is a problem that in the case of such an arc, if the PTC element and another wire are contact-welded, it cannot function as a protective element

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1 (formation of protective element)

[0041] Use the following elements, such as figure 2 As shown in (a) (wherein, as described below, only the shape of the shape memory alloy wire is different), the protective element of the present invention is connected to the wiring substrate:

[0042] (1) Polymer PTC element (manufactured by Tyco Electronics Raychem K.K.)

[0043] Product name: PolySwitch (holding current capacity: 2.0A (at 70°C), disconnection temperature: 125°C)

[0044] Size: 3.4mm×3.6mm (thickness 0.5mm)

[0045] PTC polymer element (polyethylene + nickel filler)

[0046] Metal electrode: gold-plated nickel (thickness: 0.03μm)

[0047] (2) Shape memory alloy wire (manufactured by K.K. Furukawa Techno Material, Ni-Ti-Cu)

[0048] Product name: NT Alloy

[0049] Size: diameter 0.75mm × about 10mm

[0050] Shape: Straight lead shape before restoration → Bent lead shape after restoration

[0051] Recovery temperature: 80°C

[0052] (3) Conduct...

Embodiment 2

[0058] Example 2 (confirmation of the operation of the protection element)

[0059] Under the condition of 25°C, as described above, when a current flows under the condition of 20A / 6V in the substrate on which the protective element is arranged, the polymer PTC element 18 is disconnected, and after that, due to the heat generation of the polymer PTC element, the shape The memory alloy wire 20 operates to substantially cut off the current flowing in the circuit.

[0060] As described above, on the other substrate on which the protection element is arranged, the temperature around the substrate is gradually increased from 50°C while a current is flowing through the substrate under the condition of 100mA / 6V (the condition that the PTC element is never disconnected). When the ambient temperature is about 80° C., the linear shape memory alloy wire recovers and becomes bent, and is separated from the conductive adhesive 22, so the circuit in which the protection element is inserted ...

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Abstract

A novel protective device that has a large capacity, being capable of sensing relatively low abnormal temperatures, and that has a simple structure and a small size. The protective device comprises (1) polymer PTC element (18) provided at its both-side major surfaces with metal electrodes (14,16) and (2) shape-memory alloy lead (20), wherein the shape-memory alloy lead is connected to the polymer PTC element by means of conductive adhesive (22) containing a thermoplastic resin and a conductive filler.

Description

technical field [0001] The present invention relates to a protection element having a PTC element, and more particularly to a protection element having a PTC element to which a shape memory alloy wire is connected, and a method for manufacturing such a protection element. Background technique [0002] In order to prevent excessive current discharge, charging and overheating of the battery packs of mobile electronic devices such as mobile phones, polymer PTC elements are used as protection elements. The polymer PTC element has a polymer PTC element and metal electrodes arranged on both sides thereof, and is arranged in close contact with the battery pack. The polymer PTC element is composed of a conductive material containing a polymer and a conductive filler dispersed therein. The polymer composition is formed. The PTC element has the following two functions: It senses an abnormally increased temperature (hereinafter referred to as "abnormally increased temperature", for ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01C7/02C22C14/00H01H37/32H01H37/76
CPCH01H37/323H01H2037/768H01C1/1406H01H37/761H01C7/027C22C14/00H01C7/126H01C7/22H01H37/32
Inventor 小山洋幸
Owner TYCO ELECTRONICS RAYCHEM BVBA
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