CN101556850A - New positive temperature coefficient thermosensitive resistor and manufacturing method thereof - Google Patents
New positive temperature coefficient thermosensitive resistor and manufacturing method thereof Download PDFInfo
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- CN101556850A CN101556850A CNA2009100516160A CN200910051616A CN101556850A CN 101556850 A CN101556850 A CN 101556850A CN A2009100516160 A CNA2009100516160 A CN A2009100516160A CN 200910051616 A CN200910051616 A CN 200910051616A CN 101556850 A CN101556850 A CN 101556850A
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Abstract
The invention relates to a new positive temperature coefficient thermosensitive resistor which comprises a positive temperature coefficient resistance element and a heatproof insulate elastomer layer. The positive temperature coefficient resistance element comprises a conductive polymer chip with the characteristics of PTC, two metal foil electrode layers and two extraction electrodes; the two metal foil electrode layers are respectively adhered on two opposite surfaces of the conductive polymer chip; the two extraction electrodes are respectively connected to outer surfaces of the two metal foil electrode layers; the heatproof insulate elastomer layer coats the positive temperature coefficient resistance element; the two extraction electrodes respectively penetrate the heatproof insulate elastomer layer; and the heatproof insulate elastomer layer can be further enveloped by a powder insulating layer. The new positive temperature coefficient thermosensitive resistor of the invention has smart design, thereby effectively reducing occurrence of arc discharge phenomenon between the electrodes; therefore, the new positive temperature coefficient thermosensitive resistor effectively reduces abnormal phenomena occurrence, such as cracking, combustion and the like, so as to effectively improve product safety performance and total percent of pass while having simple manufacturing process and high efficiency.
Description
Technical field
The present invention relates to the thermistor technical field, particularly the positive temperature coefficient thermistor technical field specifically is meant a kind of new positive temperature coefficient thermosensitive resistor and manufacture method thereof.
Background technology
Positive temperature coefficient (PTC, Positive Temperature Coefficient) performance thermistor has been widely used in the circuit protection in the 6C industrial fields such as computer, communication, consumer electronics, automobile, path, digital content.Its operation principle is: when the circuit operate as normal, and PTC thermistor resistance R
0The very little electric current that do not hinder passes through; And when overcurrent, overload or fault such as overheated appearred in circuit, the thermistor gauge surface temperature rose rapidly, and moment rises to high-impedance state when surpassing switch temperature, thereby in time the restricting circuits electric current is to very low-level protective circuit; After fault was got rid of, the PTC thermistor cooled off rapidly and returns to former low resistive state, and circuit recovers this thermistor of normal back and can reuse once more.
But, there is following defective in the thermistor that utilizes existing structure design and technical matters to produce, when thermistor is in the high-impedance state of fault, on the one hand, two-layer electrode layer voltage on the chip increases, because chip is very thin, often there is creepage phenomenon between electrode, chip produces the electric spark phenomenon, and when arc discharge was serious, the temperature chip that sharply raises can produce the damage of irrecoverable property, on the other hand, chip expands and can not in time dispel the heat because internal temperature sharply raises, and causes easily as product and ftractures, anomalies such as burning, thus cause thermistor to lose efficacy.
Summary of the invention
The objective of the invention is to have overcome above-mentioned shortcoming of the prior art, a kind of new positive temperature coefficient thermosensitive resistor and manufacture method thereof are provided, this new positive temperature coefficient thermosensitive resistor design is ingenious, the generation of arc discharge phenomenon between effectively less electrode, effectively reduce anomaly occurrence probability such as cracking, burning, thereby effectively improve product safety performance and total qualification rate, manufacturing simultaneously is simple, efficient is high.
To achieve these goals, in a first aspect of the present invention, a kind of new positive temperature coefficient thermosensitive resistor is provided, comprise the positive temperature coefficient resistor element, described positive temperature coefficient resistor element comprises the electric conductive polymer chip with ptc characteristics, two metal foil electrode layers and two extraction electrodes, two described metal foil electrode layers are fitted in the relative two sides of described electric conductive polymer chip respectively, two described extraction electrodes are connected on the outer surface of two described metal foil electrode layers, be characterized in, described new positive temperature coefficient thermosensitive resistor also comprises high temperature insulation elastic gel layer, described high temperature insulation elastic gel layer coats described positive temperature coefficient resistor element, and two described extraction electrodes pass described high temperature insulation elastic gel layer respectively.
Preferably, the heat resisting temperature of described high temperature insulation elastic gel layer is above 150 ℃.
Preferably, described high temperature insulation elastic gel layer contains one or more in bisphenol epoxy, epoxidation phenolic aldehyde, the silicones, perhaps one or more in bisphenol epoxy and solvent thereof, epoxidation phenolic aldehyde and solvent, silicones and the solvent thereof.
Preferably, two described extraction electrodes are radially drawn and partly are fitted on the two described metal foil electrode layers respectively.
Preferably, comprise that also described new positive temperature coefficient thermosensitive resistor also comprises the powder insulating barrier, described powder insulating barrier coats described high temperature insulation elastic gel layer, and two described extraction electrodes pass described powder insulating barrier respectively.
More preferably, described powder insulating barrier is an epoxy resin powder insulating barrier.
In a second aspect of the present invention, a kind of manufacture method of above-mentioned new positive temperature coefficient thermosensitive resistor also is provided, be characterized in that described method may further comprise the steps:
A. prepare described electric conductive polymer chip;
B. two described metal foil electrode laminatings are combined on the relative two sides of described electric conductive polymer chip;
C. two described extraction electrodes are connected on the outer surface of two described metal foil electrode layers;
D. described high temperature insulation elastic gel layer is coated on the described positive temperature coefficient resistor element, two described extraction electrodes pass described high temperature insulation elastic gel layer respectively.
Preferably, the heat resisting temperature of described high temperature insulation elastic gel layer is above 150 ℃.
Preferably, in steps d, concrete brushing, spraying, dip-coating or the showering mode of adopting solidified described high temperature insulation elastic gel then and formed described high temperature insulation elastic gel layer at described positive temperature coefficient resistor element-external parcel one deck high temperature insulation elastic gel.
Preferably, described high temperature insulation elastic gel layer contains one or more in bisphenol epoxy, epoxidation phenolic aldehyde, the silicones, perhaps one or more in bisphenol epoxy and solvent thereof, epoxidation phenolic aldehyde and solvent, silicones and the solvent thereof.
Preferably, two described extraction electrodes are radially drawn and partly are fitted on the two described metal foil electrode layers respectively.
Preferably, after steps d, further comprising the steps of:
Described powder insulating barrier is coated described high temperature insulation elastic gel layer, and two described extraction electrodes pass described powder insulating barrier respectively.
More preferably, described powder insulating barrier is an epoxy resin powder insulating barrier.
Preferably, between step b and the c, between step c and d or after steps d, further comprising the steps of:
Described electric conductive polymer chip cross-linking radiation and heat treatment with the two described metal foil electrode layers of fitting.
Beneficial effect of the present invention is:
1, new positive temperature coefficient thermosensitive resistor of the present invention is parcel one deck high temperature insulation elastic gel layer on the positive temperature coefficient resistor element, design ingenious, owing to closely wrap up one deck high temperature insulation elastic gel layer in the positive temperature coefficient resistor element-external, make the effective secluding air of product, the generation of arc discharge phenomenon between on the one hand, effectively less electrode; On the other hand, when the product bug internal temperature sharply raise, the internal sizes volume expansion provided hot resilient coating for chip, effectively reduced anomaly occurrence probability such as cracking, burning; Thereby effectively improve product safety performance and total qualification rate;
2, the high temperature insulation elastic gel layer outer wrapping one powder insulating barrier of new positive temperature coefficient thermosensitive resistor of the present invention has improved the insulation of thermistor, performance such as moisture resistance;
3, thereby new positive temperature coefficient thermosensitive resistor manufacture method of the present invention has more one than conventional method and applies and solidify the step that the high temperature insulation elastic gel forms high temperature insulation elastic gel layer, optionally also can be included in high temperature insulation elastic gel layer outer wrapping powder insulating barrier, make simply the efficient height.
Description of drawings
Fig. 1 is that the master of a specific embodiment of new positive temperature coefficient thermosensitive resistor of the present invention looks partial schematic sectional view.
Fig. 2 is the side-looking partial schematic sectional view of specific embodiment shown in Figure 1.
Fig. 3 is that the master of another specific embodiment of new positive temperature coefficient thermosensitive resistor of the present invention looks partial schematic sectional view.
Fig. 4 is the side-looking partial schematic sectional view of specific embodiment shown in Figure 3.
Embodiment
In order more to be expressly understood technology contents of the present invention, describe in detail especially exemplified by following examples.
Embodiment 1:
The new positive temperature coefficient thermosensitive resistor structure and the manufacture method thereof of embodiments of the invention 1 are described with reference to Fig. 1 and 2.
Fig. 1 is that the master of a specific embodiment of new positive temperature coefficient thermosensitive resistor of the present invention looks partial schematic sectional view, it is the internal cross section figure that radially draws the new structure of type PTC thermistor, and Fig. 2 is this side-looking partial schematic sectional view of radially drawing type PTC thermistor.
This radially draws type ptc characteristics thermistor and comprises electric conductive polymer chip 1, two metal foil electrode layers 2 and high temperature insulation elastic gel layer 3 and two extraction electrodes 4 with ptc characteristics.Wherein, double layer of metal foil electrode layer 2 closely is covered on the upper and lower surface of electric conductive polymer chip 1 of above-mentioned ptc characteristics, extraction electrode 4 closely is affixed on the outer surface of two metal foil electrode layers 2 up and down, form the positive temperature coefficient resistor element, high temperature insulation elastic gel layer 3 evenly is covered on six of the integral body of above-mentioned positive temperature coefficient resistor element, extraction electrode 4 passes high temperature insulation elastic gel layer 3, and metal foil electrode layer 2, extraction electrode 4 keep good being electrically connected with the electric conductive polymer chip 1 of ptc characteristics.
Below, the above-mentioned type PTC thermistor manufacture method of radially drawing is illustrated.
At first, the mixing of raw materials such as one or more crystalline polymers, conducting filler and processing aid is made the thin slice that gross thickness is 0.10～5mm by processing modes such as twin-screw extrusion calendarings respectively, the electric conductive polymer chip 1 that promptly has ptc characteristics, two metal foil electrode layers 2 closely laminate respectively on electric conductive polymer chip 1 upper and lower surface with ptc characteristics then;
After being 1～100Mrad irradiation with gamma-rays, dosage, 80～150 ℃ of heat treatment is 1～24 hour in vacuum drying oven thereupon;
Then, on the outer surface of above-mentioned two metal foil electrode layers 2, weld extraction electrode 4 respectively, form the positive temperature coefficient resistor element;
Thereafter, by modes such as brushing, spraying, dip-coating, showerings, with the above-mentioned outer wrap one deck high temperature insulation elastic gel layer 3 that has the positive temperature coefficient resistor element of extraction electrode 4, extraction electrode 4 passes high temperature insulation elastic gel layer 3, at last the above-mentioned high temperature insulation elastic gel layer 3 of having wrapped up is solidified and gets final product.
Here, only be aimed at the product concrete structure its manufacturing process is described, the concrete parameter of each operation is not done careful explanation, the employing conventional parameter carries out, and operations such as cross-linking radiation wherein, heat treatment, gluing can be according to electric property (as resistance-temperature characteristics, current characteristics, the voltage-current characteristic) requirement of concrete element, the order can suitably partly exchange, below each embodiment all like this, so do not give unnecessary details.
Other are irregular as cylindrical, the square bodily form and other and the electric conductive polymer chip 1 of the ptc characteristics of above-mentioned thermistor also can be made.
Contrast traditional structure and technology, the type of radially the drawing thermistor of present embodiment 1 is compared with the similar type thermistor structure of radially drawing in the past, the thermistor structure that is disclosed is many one deck high temperature insulation elastic gel layer 3; Compare many one coating process simple to operate of disclosed thermistor technology with similar thermistor technology in the past.Like this, owing to closely wrap up one deck high temperature insulation elastic gel layer 3, make the effective secluding air of product, make on the one hand, the generation of arc discharge phenomenon between effectively less electrode in the ptc characteristics chip exterior; On the other hand, when the product bug internal temperature sharply raise, the internal sizes volume expansion provided hot resilient coating for chip, effectively reduced anomaly occurrence probability such as cracking, burning; Thereby effectively improve product safety performance and total qualification rate.
Embodiment 2:
New positive temperature coefficient thermosensitive resistor structure and manufacture method thereof with reference to Fig. 3 and 4 explanation embodiments of the invention 2.
Fig. 3 is that the master of another specific embodiment of new positive temperature coefficient thermosensitive resistor looks partial schematic sectional view, it is another internal cross section figure that radially draws the new structure of type PTC thermistor, and Fig. 4 is this side-looking partial schematic sectional view of radially drawing the new structure of type PTC thermistor.
This radially draws type ptc characteristics thermistor and comprises electric conductive polymer chip 11, two metal foil electrode layers 12 and high temperature insulation elastic gel layer 13, two extraction electrodes 14 and the epoxy resin powder insulating barrier 15 with ptc characteristics.Wherein, double layer of metal foil electrode layer 12 closely is covered on the upper and lower surface of electric conductive polymer chip 11 of above-mentioned ptc characteristics, two extraction electrodes 14 closely are affixed on the outer surface of two metal foil electrode layers 12 up and down, form the positive temperature coefficient resistor element, high temperature insulation elastic gel layer 13 evenly is covered on six of the integral body of above-mentioned positive temperature coefficient resistor element, epoxy resin powder insulating barrier 15 evenly is wrapped in high temperature insulation elastic gel layer 13 outside, extraction electrode 14 passes high temperature insulation elastic gel layer 13 and epoxy resin powder insulating barrier 15, metal foil electrode layer 12, extraction electrode 14 keeps good being electrically connected with the electric conductive polymer chip 11 of ptc characteristics.
Below, the above-mentioned type PTC thermistor manufacture method of radially drawing is illustrated.
At first, the mixing of raw materials such as one or more crystalline polymers, conducting filler and processing aid is made the thin slice that gross thickness is 0.10～5mm by processing modes such as twin-screw extrusion calendarings respectively, the electric conductive polymer chip 11 that promptly has ptc characteristics, two metal foil electrode layers 12 closely laminate respectively on electric conductive polymer chip 11 upper and lower surfaces with ptc characteristics then;
After being 1～100Mrad irradiation with gamma-rays, dosage, 80～150 ℃ of heat treatment is 1～24 hour in vacuum drying oven thereupon;
Then, on the outer surface of above-mentioned two metal foil electrode layers 12, weld extraction electrode 14 respectively, form the positive temperature coefficient resistor element;
Thereafter, by modes such as brushing, spraying, dip-coating, showerings, with the above-mentioned outer wrap one deck high temperature insulation elastic gel layer 13 that has the positive temperature coefficient resistor element of extraction electrode 14, extraction electrode 14 passes high temperature insulation elastic gel layer 13, and solidifies described high temperature insulation elastic gel layer 13;
At above-mentioned high temperature insulation elastic gel layer 13 outer envelope one deck epoxy resin powder insulating barrier 15, extraction electrode 14 passes epoxy resin powder insulating barrier 15 again.
Equally, the electric conductive polymer chip 1 of the ptc characteristics of above-mentioned thermistor also can make that other are irregular as cylindrical, the square bodily form and other.
Contrast traditional structure and technology, the type of radially the drawing thermistor of present embodiment 2 is compared with the similar type of radially the drawing thermistor structure of sealing in the past, the thermistor structure that is disclosed is many one deck high temperature insulation elastic gel layer 13; Compare many one coating process simple to operate of disclosed thermistor technology with similar thermistor technology in the past.Like this, owing to closely wrap up one deck high temperature insulation elastic gel layer 13, make the effective secluding air of product, make on the one hand, the generation of arc discharge phenomenon between effectively less electrode in the ptc characteristics chip exterior; On the other hand, when the product bug internal temperature sharply raise, the internal sizes volume expansion provided hot resilient coating for chip, effectively reduced anomaly occurrence probability such as cracking, burning; Thereby effectively improve product safety performance and total qualification rate.
To sum up, new positive temperature coefficient thermosensitive resistor of the present invention design is ingenious, and the generation of arc discharge phenomenon effectively reduces anomaly occurrence probability such as cracking, burning between effectively less electrode, thereby effectively improve product safety performance and total qualification rate, manufacturing simultaneously is simple, efficient is high.
In this specification, the present invention is described with reference to its certain embodiments.But, still can make various modifications and conversion obviously and not deviate from the spirit and scope of the present invention.Therefore, specification and accompanying drawing are regarded in an illustrative, rather than a restrictive.
Claims (14)
1. new positive temperature coefficient thermosensitive resistor, comprise the positive temperature coefficient resistor element, described positive temperature coefficient resistor element comprises the electric conductive polymer chip with ptc characteristics, two metal foil electrode layers and two extraction electrodes, two described metal foil electrode layers are fitted in the relative two sides of described electric conductive polymer chip respectively, two described extraction electrodes are connected on the outer surface of two described metal foil electrode layers, it is characterized in that, described new positive temperature coefficient thermosensitive resistor also comprises high temperature insulation elastic gel layer, described high temperature insulation elastic gel layer coats described positive temperature coefficient resistor element, and two described extraction electrodes pass described high temperature insulation elastic gel layer respectively.
2. new positive temperature coefficient thermosensitive resistor according to claim 1 is characterized in that, the heat resisting temperature of described high temperature insulation elastic gel layer is above 150 ℃.
3. new positive temperature coefficient thermosensitive resistor according to claim 1, it is characterized in that, described high temperature insulation elastic gel layer contains one or more in bisphenol epoxy, epoxidation phenolic aldehyde, the silicones, perhaps one or more in bisphenol epoxy and solvent thereof, epoxidation phenolic aldehyde and solvent, silicones and the solvent thereof.
4. new positive temperature coefficient thermosensitive resistor according to claim 1 is characterized in that, two described extraction electrodes are radially drawn and partly are fitted on the two described metal foil electrode layers respectively.
5. new positive temperature coefficient thermosensitive resistor according to claim 1, it is characterized in that, comprise that also described new positive temperature coefficient thermosensitive resistor also comprises the powder insulating barrier, described powder insulating barrier coats described high temperature insulation elastic gel layer, and two described extraction electrodes pass described powder insulating barrier respectively.
6. new positive temperature coefficient thermosensitive resistor according to claim 5 is characterized in that, described powder insulating barrier is an epoxy resin powder insulating barrier.
7. the manufacture method of a new positive temperature coefficient thermosensitive resistor according to claim 1 is characterized in that, described method may further comprise the steps:
A. prepare described electric conductive polymer chip;
B. two described metal foil electrode laminatings are combined on the relative two sides of described electric conductive polymer chip;
C. two described extraction electrodes are connected on the outer surface of two described metal foil electrode layers;
D. described high temperature insulation elastic gel layer is coated on the described positive temperature coefficient resistor element, two described extraction electrodes pass described high temperature insulation elastic gel layer respectively.
8. the manufacture method of new positive temperature coefficient thermosensitive resistor according to claim 7 is characterized in that, the heat resisting temperature of described high temperature insulation elastic gel layer is above 150 ℃.
9. the manufacture method of new positive temperature coefficient thermosensitive resistor according to claim 7, it is characterized in that, in steps d, concrete brushing, spraying, dip-coating or the showering mode of adopting solidified described high temperature insulation elastic gel then and formed described high temperature insulation elastic gel layer at described positive temperature coefficient resistor element-external parcel one deck high temperature insulation elastic gel.
10. the manufacture method of new positive temperature coefficient thermosensitive resistor according to claim 7, it is characterized in that, described high temperature insulation elastic gel layer contains one or more in bisphenol epoxy, epoxidation phenolic aldehyde, the silicones, perhaps one or more in bisphenol epoxy and solvent thereof, epoxidation phenolic aldehyde and solvent, silicones and the solvent thereof.
11. the manufacture method of new positive temperature coefficient thermosensitive resistor according to claim 7 is characterized in that, two described extraction electrodes are radially drawn and partly are fitted on the two described metal foil electrode layers respectively.
12. the manufacture method of new positive temperature coefficient thermosensitive resistor according to claim 7 is characterized in that, after steps d, comprises that also the step is following rapid:
Described powder insulating barrier is coated described high temperature insulation elastic gel layer, and two described extraction electrodes pass described powder insulating barrier respectively.
13. the manufacture method of new positive temperature coefficient thermosensitive resistor according to claim 12 is characterized in that, described powder insulating barrier is an epoxy resin powder insulating barrier.
14. the manufacture method of new positive temperature coefficient thermosensitive resistor according to claim 7 is characterized in that, and is between step b and the c, between step c and d or after steps d, further comprising the steps of:
Described electric conductive polymer chip cross-linking radiation and heat treatment with the two described metal foil electrode layers of fitting.
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| CNA2009100516160A CN101556850A (en) | 2009-05-20 | 2009-05-20 | New positive temperature coefficient thermosensitive resistor and manufacturing method thereof |
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| CNA2009100516160A CN101556850A (en) | 2009-05-20 | 2009-05-20 | New positive temperature coefficient thermosensitive resistor and manufacturing method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104681221A (en) * | 2015-02-25 | 2015-06-03 | 上海长园维安电子线路保护有限公司 | PPTC (polymeric positive temperature coefficient) thermosensitive resistor with high voltage withstanding grade and preparing method of PPTC (polymeric positive temperature coefficient) thermosensitive resistor |
| WO2016019723A1 (en) * | 2014-08-08 | 2016-02-11 | Dongguan Littelfuse Electronics, Co., Ltd | Varistor having multilayer coating and fabrication method |
| CN105895608A (en) * | 2016-05-03 | 2016-08-24 | 扬州国扬电子有限公司 | Power module for electrode package insulating layer |
-
2009
- 2009-05-20 CN CNA2009100516160A patent/CN101556850A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016019723A1 (en) * | 2014-08-08 | 2016-02-11 | Dongguan Littelfuse Electronics, Co., Ltd | Varistor having multilayer coating and fabrication method |
| US10446299B2 (en) | 2014-08-08 | 2019-10-15 | Dongguan Littelfuse Electronics Company Limited | Varistor having multilayer coating and fabrication method |
| CN104681221A (en) * | 2015-02-25 | 2015-06-03 | 上海长园维安电子线路保护有限公司 | PPTC (polymeric positive temperature coefficient) thermosensitive resistor with high voltage withstanding grade and preparing method of PPTC (polymeric positive temperature coefficient) thermosensitive resistor |
| CN105895608A (en) * | 2016-05-03 | 2016-08-24 | 扬州国扬电子有限公司 | Power module for electrode package insulating layer |
| CN105895608B (en) * | 2016-05-03 | 2018-07-20 | 扬州国扬电子有限公司 | A kind of power module of electrode packet insulating layer |
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Open date: 20091014 |