CN1283304A - Electrical device - Google Patents

Electrical device Download PDF

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Publication number
CN1283304A
CN1283304A CN98811986.2A CN98811986A CN1283304A CN 1283304 A CN1283304 A CN 1283304A CN 98811986 A CN98811986 A CN 98811986A CN 1283304 A CN1283304 A CN 1283304A
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China
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temperature
described device
lead wire
highest
component
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Granted
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CN98811986.2A
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Chinese (zh)
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CN1155011C (en
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宫坂直文
S·M·方
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TE Connectivity Corp
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Tyco Electronics Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C17/00—Apparatus or processes specially adapted for manufacturing resistors
    • H01C17/30—Apparatus or processes specially adapted for manufacturing resistors adapted for baking
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
    • H01C7/02—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having positive temperature coefficient
    • H01C7/027—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having positive temperature coefficient consisting of conducting or semi-conducting material dispersed in a non-conductive organic material

Abstract

An electrical device (1) containing a resistive element (9) composed of a conductive polymer composition which exhibits PTC behavior which is attached to two metal foil electrodes (11, 13). The device is prepared by a method which includes the steps of (a) cutting the device from a laminate containing the conductive polymer composition positioned between two metal foils; (b) exposing the device after the cutting step to at least one thermal excursion from a first temperature which is at most (Tm-100) DEG C to a second temperature which is at most (Tm-25) DEG C; and (c) crosslinking the conductive polymer composition after the thermal excursion. The devices of the invention have low resistance and are useful as circuit protection devices.

Description

Electric device
The method that the present invention relates to comprise the electric device of conducting polymer and make this device.
The electric device that comprises the conducting polymer component of (positive temperature coefficient of resistance) characteristic that has PTC is well-known, and as circuit brake and heater.This circuit brake that comprises low-resistance coefficient conducting polymer component responds to the variation of ambient temperature and/or current condition.Under normal operation, when connecting with load in the circuit, circuit brake keeps a low temperature, low resistance state.But under overcurrent or over temperature condition, device resistance increases, and has cut off the electric current that flows to load in the circuit effectively.Concerning a lot of application, in normal course of operation,, wish that device has alap resistance in order to make the all-in resistance minimum of circuit.And low resistance allows device that higher holding current is arranged, i.e. Zui Da steady-state current, and under the specific environment temperature, this electric current can not make device " jumping " arrive high resistance state by circuit brake.Although can use a given component to make the low resistance device very greatly by the varying sized very little or device area of distance between electrodes that for example makes, had better gadget.This device takes up space littler on circuit board, and has desirable thermal characteristics usually.
Realize that the most frequently used technology of gadget is to utilize the component of low-resistance coefficient.Be known that in the device assembling process, various processing technologys can increase the resistance coefficient of component, these technologies are for example shone, the temperature of encapsulation or the rising of exposure during Reflow Soldering.Therefore, wish to utilize the processing technology that does not increase the component resistance coefficient as far as possible, make final devices have low resistance.Now, we have found that a kind of special processing technology order, this order helps production low resistance device.Aspect first, provide a kind of electric device of the present invention, comprising:
(A) resistive element of being made up of a kind of conducting polymer component with ptc characteristics comprises:
(1) a kind of have a polymer composition that at least 20% degree of crystallinity and fusing point are Tm, and
(2) a kind of particulate conductive filler that in this polymer composition, is spread; And
(B) two electrodes, they (ⅰ) attached on the resistive element, (ⅱ) comprise metal forming, and (ⅲ) can be connected to power supply,
Described device prepares by the method that comprises following steps:
(a) from the device of a lamination cutting that comprises this conducting polymer component between two metal formings;
(b) after cutting step, make device through at least one thermal change from first temperature to second temperature, first temperature is the highest is (Tm-100) ℃, and second temperature is the highest is (Tm-25) ℃; And
(c) crosslinked this conducting polymer component after thermal change.
Aspect second, the invention provides a kind of method of making electric device, comprising:
(A) a kind of resistive element, the maximum 0.51mm of its (ⅰ) thickness, (ⅱ) crosslinked with the equivalent of 2Mrad at least, and (ⅲ) form by a kind of conducting polymer component, described conducting polymer component comprises
(1) a kind of have a polymer composition that at least 20% degree of crystallinity and fusing point are Tm, and
(2) a kind of particulate conductive filler that in this polymer composition, is spread; And
(B) two electrodes, they (ⅰ) attached on the resistive element, (ⅱ) comprise metal forming, and (ⅲ) can be connected to power supply,
Described device is prepared by the method that comprises following steps:
(a) from the device of a lamination cutting that comprises this conducting polymer component between two metal formings;
(b) after cutting step, make device return the thermal cycle of first temperature then from first temperature to second temperature through at least one, first temperature is the highest is (Tm-100) ℃, and second temperature is the highest is (Tm-25) ℃; And
(c) crosslinked this conducting polymer component after the thermal cycle step.
Aspect the 3rd, the invention provides a kind of battery component, comprising:
(I) battery that comprises first and second terminals; And
(II) device of first aspect also comprises according to the present invention
(C) one first conductive lead wire of connection first electrode, and
(D) one second conductive lead wire of connection second electrode; Described device is set to contact with the first terminal of this battery, makes this first conductive lead wire contact in the mode of physics with electricity with this terminal.
The present invention illustrates by accompanying drawing, in the accompanying drawing,
Fig. 1 is the profile of device of the present invention;
Fig. 2 is the top view of device of the present invention;
Fig. 3 is the top view of first conductive lead wire that forms the part of device of the present invention;
Fig. 4 is the top view that is connected with the device of the present invention of second conductive lead wire;
Fig. 5 is the top view that comprises the device of the present invention of an insulating barrier; And
Fig. 6 is the curve chart that the distribution of resistance of the device of making by method of the present invention and two comparative approach is shown.
Electric device of the present invention comprises a resistive element and first and second metal formings, and resistive element is made up of the conducting polymer component, and first and second metal formings are attached to and clamp this resistive element.The conducting polymer component comprises a kind of polymer composition and a kind of particulate conductive filler that spreads therein.The polymer composition comprises one or more polymer, wherein a kind of preferably by difference formula scanning calorimeter at its crystalline polymer of not measuring under the occupied state with at least 20% degree of crystallinity.Suitable crystalline polymer comprises: one or more alkene, the especially for example poly polymer of high density polyethylene (HDPE); At least a alkene and at least a can with the monomer copolymer of ethylene/acrylic acid, ethene/acetaldehyde acrylate, ethylene/vinyl base acetate and the copolymerization of ethylene/butylene acrylate copolymer; Melt plastic fluoropolymer, for example Kynoar (PVDF) and Tefzel (ETFE comprises terpolymer); And the mixing of two or more this polymer.Use for some, wish a kind of crystalline polymer and another kind of polymer mixed, for example a kind of elastomer or a kind of noncrystal thermoplastic polymer, so that realize specific physical characteristic or thermal characteristics, for example, elasticity or maximum exposure temperature.The polymer composition generally includes the 40-90% in the cumulative volume of component, is preferably 45-80%, particularly 50-75%.
The particulate conductive filler that is diffused in the polymer composition can be any suitable material, comprises the combination of carbon black, graphite, metal, metal oxide, conductive coating glass or porcelain bead, particulate conducting polymer or these materials.The form of filler can be powder, bead, thin slice, fiber or other any suitable shapes.The resistance coefficient decision that the required conduction section of filling out amount is filled out section itself by the resistance coefficient and the conduction of required component.Concerning a lot of components, conductive filler comprises the 10-60% of the cumulative volume of component, is preferably 20-55%, concerning the low-resistance coefficient component that is used for low resistance circuit protection device, is in particular 25-50%.
The conducting polymer component can comprise supplementary element, antioxidant, inert filler, non-conducting filler, radiation crosslinking agent (being commonly referred to radiation auxiliary agent or crosslinking enhancer, for example trimerization isocyanines acid triallyl), stabilizer, diffusant, coupling agent, plumper (CaCO for example for example 3), or other composition.These compositions comprise at most usually total component volume 20%.Can conductive filler and other compositions be diffused in the component of polymer by any suitable hybrid mode, for example melt processed or dissolving mix.Mixed component can be that for example melt is extruded by any suitable method melt-forming, injection molding, pressing mold or sintering, with the element that has a resistance.Element is preferably laminar, can be Any shape, for example rectangle, square, circle or annular.The common thickness maximum of resistive element is 1.02mm (0.040 inch), and is thinner concerning a lot of application, and promptly the thickness maximum is 0.51mm (0.020 inch), and preferred maximum ga(u)ge is 0.38mm (0.015 inch).
The component that adopts in the resistive element has positive temperature coefficient (PTC) characteristic, promptly demonstrates resistance coefficient in relatively little temperature range and increases rapidly with temperature.In this application, term " PTC " refers to have and is at least 2.5 R 14Value and/or be at least 10 R 100The component or the device of value, component or device preferably should have and be at least 6 R 30Value, wherein R 14Be at the end of 14 ℃ of scopes and the resistance coefficient ratio at place, top, R 100Be at the end of 100 ℃ of scopes and the resistance coefficient ratio at place, top, R 30Be at the end of 30 ℃ of scopes and the resistance coefficient ratio at place, top.Usually, the component that adopts in the device of the present invention demonstrates much larger than the increase of the resistance coefficient of those minimum values.
Suitable conducting polymer component is disclosed in: U.S. Patent No. 4,237,441 (vanKonynenburg etc.), 4,545,926 (Fouts etc.), 4,724,417 (Au etc.), 4,774,024 (Deep etc.), 4,935,156 (van Konynenburg etc.), 5,049,850 (Evans etc.), 5,250,228 (Baigrie etc.), 5,378,407 (Chandler etc.), 5,451,919 (Chu etc.), 5,582,770 (Chu etc.), 5,747,147 (Wartenberg etc.), 5,801,612 (Chandler etc.) and the open No.WO96/29711 in the world of being transferred the possession of jointly (company of Raychem company, on September 26th, 1997 published).
Resistive element is attached on the first and second lamination shape electrodes, is attached to respectively on first and second of resistive element.Preferably, the conducting polymer component be squeezed out or otherwise form sheet, electrode can be attached on the sheet to form lamination, promptly conducting polymer is clipped between the paper tinsel.Although one or two electrode can comprise conductive paint or graphite linings, the first and second electrode boths comprise electric conducting material, preferably the metal of paper tinsel form, for example nickel, copper, brass, stainless steel, the perhaps alloy of one or more these metalloids.Can adopt for example a kind of conductive adhesive of a kind of laminated film tack coat with electrodes to resistive element.Especially, first and second electrodes preferably include the metal forming of electrolytic deposition, for example nickel, copper or be coated with the copper of nickel.Suitable electrode is disclosed in: U.S. Patent No. 4,689, the open No.WO95/34081 of 475 (Matthiesen) and 4,800,253 (Kleiner etc.) and international monopoly (Raychem company, publish December 14 nineteen ninety-five).
Device also can comprise an insulating barrier, and insulating barrier provides electic protection and environmental protection for device.Insulating barrier covers any exposed surface of some or all of metal foil electrodes and resistive element usually.The suitable insulation material comprises polymer, for example polyamide, polybutyleneterephthalate, polyester, polyethylene, polyvinylidene fluoride, liquid crystal polymer or epoxy resin.
In the method for the invention, at cutting step, device cuts down from a lamination that comprises the conducting polymer component between two metal formings.In this application, term " cutting " is used to comprise any method that the resistance with device separates or separates from lamination, for example cutting, punching press, shearing, cutting, etching and/or fracture, of the open No.WO95/34081 of international monopoly (Raychem company, publish December 14 nineteen ninety-five).
Then, device stands a heat treatment step.Heat treatment step comprises at least one variation from first temperature T, 1 to second temperature T 2.Heat treatment step preferably includes at exposure and return first temperature after second temperature, sets up from T1 to T2 the circulation of T1 thus.First temperature is the highest is (Tm-100) ℃, and preferably the highest is (Tm-120) ℃, and especially the highest is (Tm-150) ℃, and wherein Tm is the fusing point of component of polymer, and the endothermic peak by difference formula scanning calorimeter records.When having more than one peak value, for example when component of polymer comprised the mixture of crystalline polymer, Tm was defined as the temperature of the highest temperature peak.Second temperature is the highest is (Tm-25) ℃, and preferably the highest is (Tm-35) ℃, and the highest especially is (Tm-50) ℃.Importantly, first temperature is an above temperature of glass transition temperature Tg of component of polymer.T1 is a following temperature of room temperature normally, promptly is lower than 20 ℃.In a preferred embodiment of this method, device will be through at least two thermal cycles, preferably at least three thermal cycles.Use for some, device can pass through a lot of thermal cycles, for example six thermal cycles.In the heat treatment step process, for thermal change or each thermal cycle, device stops time enough and reaches the temperature of appointment to guarantee entire device on first and second temperature.The time cycle that device stops on T1 and T2 can be the same or different, but at least 1 minute usually, preferably at least 3 minutes, better at least 5 minutes, especially at least 10 minutes, more particularly at least 15 minutes, at least 30 minutes especially, for example 60 minutes, the temperature that reaches appointment from device began Measuring Time.In heat treatment step, can use any suitable thermal source, for example stove (stove particularly able to programme) or other environmental control rooms, or heating lamp.The speed that temperature is elevated to T2 (and get back to T1, if any) from T1 can be speed easily, for example 2-30 ℃/minute.When heat treatment step was a thermal cycle, the speed from T1 to T2 can be identical with the speed from T2 to T1, also can be inequality.
After the heat treatment step, make the conducting polymer component crosslinked.Crosslinked can the realization by chemical method or irradiation for example adopted electron beam or Co 60The γ irradiation bomb.Crosslinked grade depends on the application of required component, but is less than the equivalent of 200Mrad usually, and is preferably few basically, promptly from 1 to 20Mrad, preferably from 1 to 15Mrad, especially concerning low pressure (promptly being lower than 60 volts) is used from 2 to 10Mrad.To be lower than the useful circuit brake of 30 volts application can by with device irradiation to 20Mrad at least but at most 10Mrad make.
For a lot of application, need be that first conductive lead wire is connected to one of them of metal foil electrode with at least one conductive lead wire.Usually, first and second conductive lead wires connect first and second electrodes respectively.Conductive lead wire allows electrode is connected to power supply easily, and for example battery or power supply perhaps are connected in the circuit, and can be used for the thermal output of control device.For being easy to make, preferably for example scolder or conductive adhesive are connected on the electrode conductive lead wire that is provided with as the part of lead frame by an intermediate layer usually.This lead-in wire Connection Step is preferably in after the cutting step and carried out before heat treatment step.Other packaging technologies, the so electric look edge layer of application of epoxy or other polymer for example carries out during being preferably in number of assembling steps, comprises the lead-in wire Connection Step and carries out after cutting step and before heat treatment step.
The method according to this invention, next, can fabricate devices, conducting polymer has low-resistance coefficient in device, promptly is lower than 100 ohm-cms, is preferably lower than 20 ohm-cms, especially be lower than 10 ohm-cms, more particularly be lower than 5 ohm-cms, especially be lower than 2 ohm-cms, for example be lower than 1 ohm-cm.Concerning great majority are used, device usually at 20 ℃ resistance less than 1 ohm, be preferably less than 0.5 ohm, especially less than 0.25 ohm, for example 0.050 to 0.150 ohm.
Device of the present invention is particularly useful for battery component, and wherein, device preferably is connected with first or second terminal of battery.Can be between the battery and first or second electrode directly connect, perhaps battery and first conductive lead wire that is connected with first electrode or with second conductive lead wire that second electrode is connected between connect.For some batteries, wherein, first and/or second terminal is " button " form, and device is connected in the mode of physics with electricity with the button terminal.Device can be connected to the negative terminal or the positive terminal of battery.The battery that is suitable for comprises nickel-cadmium cell, nickel-metallic hydrogen battery, alkaline battery or lithium battery.Usually, battery component comprises two or more batteries.This battery component is in the world shown in open No.WO97/06538 (K.K.Raychem company, on February 20th, 1997 published) and the international open No.WO98/20567 (Raychem company, publication on May 14th, 1998).
By accompanying drawing the present invention is shown, wherein, Fig. 1 illustrates the section of electric device 1 of the present invention, comprises PTC parts 3, the-conductive lead wire 15, second conductive lead wire 18 and insulating material 23.PTC parts 3 comprise first electrode 11, second electrode 13 and the resistive element of being made up of the conducting polymer that is clipped between the two 9.In PTC parts 3 shown in Figure 1, two electrodes respect to one another form first surface 43 and second surface 41.
The top view of PTC parts 3 as shown in Figure 2.PTC parts 3 comprise surface 41 and 43, and excircle 5 and inner periphery 7 are the forms of the dish of band opening 27 at the center.7 of inner peripherys limit opening 27.
Fig. 3 illustrates the top view of first conductive lead wire 15, and it has first 16 that is connected to first electrode 11 and the second portion 17 that extends across the opening 27 of PTC parts 3.In this embodiment, first 16 covers the whole surface of first electrode 11.Cover to first lead-in wire, 15 the second portion 17 of small part opening 27 and be used for directly electrically contacting by soldered, pressure or melting welding realization and battery button terminal.Second portion 17 covers to small part opening 27.
Fig. 4 illustrates the top view of second conductive lead wire 18, and it comprises first 19 and second portion 21.First 19 is connected to second electrode 13 and covers the part surface at least of second electrode 13.Second portion 21 extends excircle 5, if desired can be crooked, and with electrically contacting of realization and second battery or other electric components.First and second conductive lead wires 15,18 can be made by any suitable material, for example nickel, stainless steel, copper or brass or the such alloy of bronze.For the ease of making, second lead-in wire 18 is the part of lead frame normally.
Fig. 5 illustrates the top view that is insulated layer 23 packaged device 1.When the positive terminal of battery places in the opening 27 ', owing between terminal and PTC parts 3, not having generation to electrically contact and short circuit can not occurring.
The present invention illustrates by following example, and wherein example 1 and 2 is comparative examples.Each example carries out following step: preparation PTC device
By accounting for the carbon black (RavenTM430U of 54% weight, can obtain from the America chemicals) and account for the high density polyethylene (HDPE) (PetrotheneTMLB32 of 46% weight, can obtain from Millenium, " HDPE ") be equipped with first mixture with the premixed of Henschel blender, with Buss kneader blend mixture, and extrude bead.The HDPE that will account for the carbon black of 51.4% weight and account for 48.6% weight by same mode is equipped with second mixture with mixing.To provide the carbon black that accounts for 52.7% weight and to account for the final mixture of the HDPE of 47.3% weight, this mixture is extruded to provide the thick sheet of 0.25mm (0.010 inch) by the compressing tablet head with the Egan extruder with the bead premixed of first and second mixtures.Be layered at 200 ℃ of sheets that utilize decompressor to extrude between the nickel foil of two-layer electrolytic deposition of the about 0.033mm of thickness (0.0013 inch) (can obtain) from Fukuda.Lamination sheets is dipped in the solder formulations of 63% plumbous 37% tin that is heated to 230 ℃ by weldering, and device shown in Figure 2 is stamped to form by lamination sheets.The device assembling
Shown in Fig. 3 and 4, first and second conductive lead wires are connected on the PTC device by the mode of 63/37 lead/tin solder, and in about 2 minutes time, flowing back to into, a temperature is elevated to the hot-blast stove of maximum temperature 2390C from 300C.Apply the insulating barrier of a liquid crystal polymer then by the mode of transfer or injection molding.Irradiation
Utilize cobalt 60 γ irradiation bombs irradiation device to provide the irradiation that total amount is 14Mrad.Temperature cycles
Device thermal cycle six times, from-40 to 80 to-40 ℃ of each circulations, speed is 1 ℃/minute, stops 60 minutes at-40 ℃ and 80 ℃.Example 1 and 2 (comparison)
As show shown in the I, carry out the device preparation, the sequencing of numeral 1 to 4 indication technical process.In each example, when 250C 100 device measuring resistances being prepared.The average resistance of last device exceeds at least 5% than the resistance (example 3) of the present invention device.Example 3
As show shown in the I, carry out the device preparation.The resistance of last device is lower than the resistance of traditional devices.The distribution of resistance of device more as shown in Figure 6.
Example The device preparation process Resistance (Mohm (unit of measure))
Preparation Assembling Irradiation Temperature cycles
1 1 2 3 4 53．3
2 1 3 2 4 64．9
3 1 2 4 3 49．0
Though the numeral of this paper is relevant with certain embodiments of the present invention with explanation, is appreciated that disclosed numeral in the specific accompanying drawing can be in suitable scope combines with other numeral and is used for other accompanying drawing, or is usually used for the present invention.Be appreciated that said apparatus and method just for the indicative explanation of the application of principle of the present invention, under the condition that makes it with scope of the present invention that does not break away from claims and limited, many additional embodiments and improvement can be arranged.

Claims (10)

1. electric device comprises:
(A) resistive element of being made up of a kind of conducting polymer component with ptc characteristics comprises:
(1) a kind of have a polymer composition that at least 20% degree of crystallinity and fusing point are Tm, and
(2) a kind of particulate conductive filler that in this polymer composition, is spread; And
(B) two electrodes, they (ⅰ) attached on the resistive element, (ⅱ) comprise metal forming, and (ⅲ) can be connected to power supply,
Described device prepares by the method that comprises following steps:
(a) from the device of a lamination cutting that comprises this conducting polymer component between two metal formings;
(b) after cutting step, temperature is the highest is (Tm-100) ℃ through at least one thermal change first from first temperature to second temperature to make device, and second temperature is the highest is (Tm-25) ℃; And
(c) crosslinked this conducting polymer component after thermal change.
2. device according to claim 1 is characterized in that, described method also is included in step (a) and before at least one conductive lead wire one of them with metal foil electrode is connected afterwards and in step (b).
3. according to one of them described device of claim 1 and 2, it is characterized in that described device has maximum 0.100 ohm resistance.
4. according to one of them described device of claim 1 to 3, it is characterized in that described device is crosslinked with 1 to 20Mrad equivalent in step (c).
5. according to wherein arbitrary described device of aforementioned claim, it is characterized in that described polymer composition comprises polyethylene, ethylene copolymer or fluoropolymer.
6. according to wherein arbitrary described device of aforementioned claim, it is characterized in that described device stands at least one in step (b) and gets back to the thermal cycle of described first temperature from described first temperature again to described second temperature.
7. according to wherein arbitrary described device of aforementioned claim, it is characterized in that, at step (b), described first temperature T 1Be lower than 23 ℃.
8. the method for a manufacturing electric device according to claim 1 is characterized in that,
(1) a kind of resistive element, the maximum 0.51mm of its (ⅰ) thickness, (ⅱ) crosslinked with the equivalent of 2Mrad at least, and
(2) after cutting step, at step (b), described device returns the thermal cycle of first temperature then through at least one from first temperature to second temperature, and first temperature is the highest is (Tm-100) ℃, and second temperature is the highest is (Tm-25) ℃.
9. method according to claim 8 is characterized in that, described device stands at least three thermal cycles in step (b).
10. battery component comprises:
(1) battery that comprises first and second terminals; And
(2) devices according to claim 1 comprise that also (a) connects one first conductive lead wire of described first electrode, and (b) connect one second conductive lead wire of described second electrode; Described device is set to contact with the first terminal of described battery, makes described first conductive lead wire contact in the mode of physics with electricity with this terminal.
CNB988119862A 1997-12-15 1998-12-10 Electrical device Expired - Fee Related CN1155011C (en)

Applications Claiming Priority (2)

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US99070797A 1997-12-15 1997-12-15
US08/990,707 1997-12-15

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CN1155011C CN1155011C (en) 2004-06-23

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101026029B (en) * 2006-02-17 2010-05-12 聚鼎科技股份有限公司 Overcurrent protection element
US8058966B2 (en) 2003-06-23 2011-11-15 Hiroyuki Koyama PTC thermistor and method for protecting circuit
CN101326596B (en) * 2005-12-09 2013-03-13 泰科电子雷伊化学株式会社 Method for manufacturing PTC device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017220747A1 (en) * 2016-06-22 2017-12-28 Thüringisches Institut für Textil- und Kunststoff-Forschung e.V. Electrically conductive shaped body with a positive temperature coefficient

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DE68920479T2 (en) * 1988-06-01 1995-05-18 Matsushita Electric Ind Co Ltd Heating mass for self-regulation of the temperature.
JPH04167501A (en) * 1990-10-31 1992-06-15 Daito Tsushinki Kk Ptc element
JPH0521207A (en) * 1991-07-12 1993-01-29 Daito Tsushinki Kk Ptc element
TW298653B (en) * 1995-02-28 1997-02-21 Yunichica Kk
DE69632687T2 (en) * 1995-08-07 2005-06-09 Tyco Electronics Raychem K.K., Kawasaki PTC DEVICE AND BATTERY SET USING THIS

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8058966B2 (en) 2003-06-23 2011-11-15 Hiroyuki Koyama PTC thermistor and method for protecting circuit
CN101326596B (en) * 2005-12-09 2013-03-13 泰科电子雷伊化学株式会社 Method for manufacturing PTC device
CN101026029B (en) * 2006-02-17 2010-05-12 聚鼎科技股份有限公司 Overcurrent protection element

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EP1042765B1 (en) 2007-05-09
JP4459438B2 (en) 2010-04-28
CN1155011C (en) 2004-06-23
DE69837771D1 (en) 2007-06-21
TW408343B (en) 2000-10-11
DE69837771T2 (en) 2008-01-17
EP1042765A1 (en) 2000-10-11
JP2002509348A (en) 2002-03-26
ATE362185T1 (en) 2007-06-15

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