CN104681222A - Novel PTC thermosensitive element - Google Patents
Novel PTC thermosensitive element Download PDFInfo
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- CN104681222A CN104681222A CN201510138582.4A CN201510138582A CN104681222A CN 104681222 A CN104681222 A CN 104681222A CN 201510138582 A CN201510138582 A CN 201510138582A CN 104681222 A CN104681222 A CN 104681222A
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Abstract
The invention discloses a novel PTC thermosensitive element which is widely applied to protection circuits of a mobile phone battery and a tablet computer battery. The novel PTC thermosensitive element consists of a conducting part, a conducting composite material layer with a resistance positive temperature coefficient effect and metal foils which are tightly combined to the upper surface and the lower surface of the conducting composite material layer with the resistance positive temperature coefficient effect, wherein the conducting composite material consists of a polymer and conducting filler, a base material of the conducting part is non-alloy Cu or alloy Cu, and the mass content of the Cu is less than 50 percent. The novel PTC thermosensitive element has advantages that when the novel PTC thermosensitive element works in the large-current circuit, the temperature of a protection switch is relatively low, and the large working current still can be maintained under the high temperature.
Description
Technical field
The present invention relates to a kind of New PTC temperature-sensitive element, while it can work in the circuit of big current, have lower protection switch temperature, and it still can maintain larger operating current at relatively high temperatures.
Background technology
The temperature-sensitive element with resistance positive temperature coefficient can maintain extremely low resistance value at a normal temperature; and there is the characteristic sharp to variations in temperature reaction; namely when overcurrent occurring in circuit or crossing high temperataure phenomena; its resistance can be increased to a high value instantaneously; circuit is made to be in off state, to reach the object of protective circuit element.Therefore the temperature-sensitive element with resistance positive temperature coefficient can be connected in circuit, as current sensing.This class component has been widely used on electronic circuit protection components and parts.
There is the temperature-sensitive element of resistance positive temperature coefficient generally by conducing composite material layer, metal foil layer and electrode layer composition.Along with the multimedization of the consumer electronics products such as mobile phone and the release of intelligentized development and 4G network, consumer electronics product requires increasing for the discharging current of battery, particularly several functions is opened simultaneously, can produce instantaneous heavy-current discharge, it is even larger that battery capacity has reached 4000mAh.This kind of battery request also needs overcharge protection while meeting heavy-current discharge.This just requires that the PTC temperature-sensitive element be serially connected with in battery protecting circuit has lower protection switch and breaks while temperature, can work under big current.The resistance of current existing conducing composite material layer declines the bottleneck run into, and the electrode resistance of PTC temperature-sensitive element exceedes its bulk resistance, significantly limit the range of application of PTC temperature-sensitive element.Present invention is disclosed a kind of PTC temperature-sensitive element that can be applied under big current condition, this element has very low shutoff temperature.
Summary of the invention
The object of the invention is: carry from a kind of New PTC temperature-sensitive element, while can working, have lower protection switch temperature, and it still can maintain larger operating current at relatively high temperatures in the circuit of big current.
New PTC temperature-sensitive element of the present invention, comprise conductive component, there is the conducing composite material layer of resistance positive temperature coefficient effect, combine closely in the metal forming of the conducing composite material layer upper and lower surface with resistance positive temperature coefficient effect, described conducing composite material is made up of polymer and conductive filler, wherein: the base material of conductive component is non-alloyed Cu or alloy Cu, and the mass content of Cu is not less than 50%.Because conductive component of the present invention selects the mass content of non-alloyed Cu or Cu to be not less than the alloy Cu of 50%; electrode resistance is little; the electrode resistance overcoming existing PTC temperature-sensitive element exceedes the defect of its bulk resistance; while can working in the circuit of big current, there is lower protection switch temperature.
On such scheme basis, described conductive component, the surface of described conductive component can other metal levels of compound, comprise nickel, tin, zinc, tungsten, silver, gold, platinum and their alloy etc.
On such scheme basis, described alloy Cu is brass, bronze or copper-nickel alloy.
On such scheme basis, described polymer is selected from polyethylene, haloflex, oxidic polyethylene, polyvinyl chloride, hycar, acrylonitrile-butadiene-styrene copolymer, polystyrene, Merlon, polyamide, PETG, polybutylene terephthalate (PBT), polyphenylene oxide, polyphenylene sulfide, polyformaldehyde, phenolic resins, polytetrafluoroethylene, tetrafluoraoethylene-hexafluoropropylene copolymer, poly-trifluoro-ethylene, polyvinyl fluoride, maleic anhydride grafted polyethylene, polypropylene, Kynoar, epoxy resin, ethylene-vinyl acetate copolymer, polymethyl methacrylate, one in ethylene-acrylic acid copolymer and composition thereof.
Described polymer accounts for the volume fraction of described conducing composite material layer between 20%-75%, and be preferably between 25%-70%, more excellent is between 30%-65%.
On such scheme basis, described conductive filler is selected from one in carbon black, graphite, carbon fiber, carbon nano-tube, metal dust, conductivity ceramics powder and composition thereof.
The particle diameter of described electric filler is preferably 0.05 μm ~ 50 μm, and more excellent is 0.1 μm ~ 20 μm; Specific insulation is not more than 0.03 Ω .m, is preferably not more than 0.02 Ω .m, more excellent in being not more than 0.01 Ω .m.Described conductive filler accounts for 25% ~ 80% of described conducing composite material basic unit volume fraction, and be preferably between 30%-75%, more excellent is between 35%-70%, is scattered in described polymer.
On such scheme basis, described metal dust is selected from: one in copper, nickel, cobalt, iron, tungsten, tin, lead, silver, gold, platinum or its alloy and composition thereof.
On such scheme basis, described conductivity ceramics powder is selected from: the mixture of one or more among metal nitride, metal carbides, metal boride, metal silicide.
On such scheme basis, described metal forming comprises a rough surface, and this rough surface and described conducing composite material layer are combined closely.
On such scheme basis, the described conducing composite material layer with resistance positive temperature coefficient effect and described metal forming of combining closely in the conducing composite material layer upper and lower surface with resistance positive temperature coefficient effect are serially connected with in protected circuit by described conductive component.
Other components also can be contained in the described conducing composite material basic unit with resistance positive temperature coefficient effect, as antioxidant, radiation crosslinker (are often called irradiation promoter, crosslinking agent or crosslinking accelerator, such as cyanacrylate), coupling agent, dispersant, stabilizer, conductive fillers (as magnesium hydroxide, calcium carbonate), fire retardant, arc light inhibitor or other components.Such as, but these components are not more than 15% of polymer-based conducing composite material cumulative volume, 5% percent by volume.
Conductive component can pass through plating, chemical plating, printing, immersed solder, spot welding, Reflow Soldering or electroconductive binder and connect on metal foil, thus connects PTC temperature-sensitive element in circuit.The shape of conductive component can have multiple: point-like, wire, band shape, sheet, column, other irregularly shaped and their assemblys.
Superiority of the present invention is: while it can work in the circuit of big current, have lower protection switch temperature, and it still can maintain larger operating current at relatively high temperatures, be applicable to the overcurrent and overheating protection of high capacity lithium ion battery.
Accompanying drawing explanation
Fig. 1 is the structural representation of PTC temperature-sensitive element chip of the present invention;
Fig. 2 is the structural representation of PTC temperature-sensitive element embodiment 1 of the present invention;
Fig. 3 is the structural representation of PTC temperature-sensitive element embodiment 2 of the present invention;
Fig. 4 is the structural representation of PTC temperature-sensitive element embodiment 3 of the present invention;
Number in the figure illustrates:
11,12---upper and lower tinsel;
2---conducing composite material layer;
31,31 ', 31 ' '---upper conductive part;
32,32 ', 32 ' '---lower conductive part.
Embodiment
A kind of New PTC temperature-sensitive element, by conductive component, have resistance positive temperature coefficient effect conducing composite material layer 2, combine closely in the tinsel up and down 11,12 on the conducing composite material layer surface with resistance positive temperature coefficient effect, described conducing composite material is made up of polymer and conductive filler, wherein: the base material of conductive component is non-alloyed Cu or alloy Cu, and the mass content of Cu is not less than 50%.
Concrete manufacture method is:
By polymer, conductive filler, processing aid by suitable formula batching, banbury temperature is set as 180 degree, rotating speed is 30 revs/min, first add polymer banburying after 3 minutes, then conductive filler and processing aid is added, feed in raw material and to complete in 3 minutes, continue banburying discharging after 15 minutes, obtain the conducing composite material with positive temperature coefficient effect.
The conducing composite material with positive temperature coefficient effect good for above-mentioned melting mixing is rolled by mill, obtains the conducing composite material basic unit 2 that thickness is 0.20 ~ 0.25 millimeter.
embodiment 1
As shown in the structural representation of Fig. 2 the present embodiment:
By conducing composite material basic unit 2 respectively by by being placed in shown in Fig. 1 between upper metal forming 11 and lower metal forming 12, by the method for hot pressing, they are closely linked.The temperature of hot pressing is 180 degrees Celsius, and pressure is 12 MPas, and the time is 10 minutes, finally colds pressing on cold press 10 minutes, obtains the conducing composite material chip with resistance positive temperature coefficient effect shown in Fig. 1.Then through punching operation, conducing composite material chip is washed into the little chip of 3mm*4mm, then through reflow soldering process, little chip is welded with the upper and lower conductive component 31,32 of copper content more than 99.9%, make PTC temperature-sensitive element, as Fig. 2.
embodiment 2
The present embodiment is identical with manufacturing process with embodiment 1 structure, just the area size the same as the area of little chip of upper and lower conductive component 31 ', 32 '.
embodiment 3
The present embodiment is identical with manufacturing process with embodiment 1 structure, just upper conductive component 31 ' ' area size the same as the area of little chip, and lower conductive component 32 ' ' grows a part than little chip, is convenient to be connected with circuit.
comparative example
This comparative example is identical with manufacturing process with embodiment 1 structure, and just upper and lower conductive component 31,32 is nickel strap.
Table one is the electric performance test data of PTC temperature-sensitive element of the present invention.R in table
0represent the initial resistivity value of PTC temperature-sensitive element; I
max/ 25 DEG C represent the most high maintenance electric current of PTC temperature-sensitive element of the present invention at 25 DEG C of temperature; TCO/950mA represents the trigger temperatures of PTC temperature-sensitive element of the present invention under 950mA electric current.As can be seen from the table, PTC temperature-sensitive element of the present invention, while having lower trigger temperatures, has higher maintenance electric current.
Content of the present invention and feature disclose as above, however above describe the present invention only relate to specific part of the present invention briefly or only, feature of the present invention may than content disclosed herein relate to more.Therefore, protection scope of the present invention should be not limited to the content that embodiment discloses, and should be included in the combination of all the elements embodied in different piece, and does not variously deviate from replacement of the present invention and modification, and is contained by claims of the present invention.
Claims (9)
1. a New PTC temperature-sensitive element, by conductive component, have resistance positive temperature coefficient effect conducing composite material layer, combine closely in the metal forming of the conducing composite material layer upper and lower surface with resistance positive temperature coefficient effect, described conducing composite material is made up of polymer and conductive filler, it is characterized in that: the base material of conductive component is non-alloyed Cu or alloy Cu, and the mass content of Cu is not less than 50%.
2. New PTC temperature-sensitive element according to claim 1, is characterized in that: described conductive component, and other metal levels of the surface recombination of described conductive component comprise nickel, tin, zinc, tungsten, silver, gold, platinum and their alloy.
3. New PTC temperature-sensitive element according to claim 1, is characterized in that described alloy Cu is brass, bronze or copper-nickel alloy.
4. New PTC temperature-sensitive element according to claim 1, it is characterized in that: described polymer accounts for the volume fraction of described conducing composite material layer between 20%-75%, be selected from polyethylene, haloflex, oxidic polyethylene, polyvinyl chloride, hycar, acrylonitrile-butadiene-styrene copolymer, polystyrene, Merlon, polyamide, PETG, polybutylene terephthalate (PBT), polyphenylene oxide, polyphenylene sulfide, polyformaldehyde, phenolic resins, polytetrafluoroethylene, tetrafluoraoethylene-hexafluoropropylene copolymer, poly-trifluoro-ethylene, polyvinyl fluoride, maleic anhydride grafted polyethylene, polypropylene, Kynoar, epoxy resin, ethylene-vinyl acetate copolymer, polymethyl methacrylate, one in ethylene-acrylic acid copolymer and composition thereof.
5. New PTC temperature-sensitive element according to claim 1, it is characterized in that: the particle diameter of described conductive filler is 0.05 μm ~ 50 μm, specific insulation is not more than 0.03 Ω .m, is selected from one in carbon black, graphite, carbon fiber, carbon nano-tube, metal dust, conductivity ceramics powder and composition thereof.
6. New PTC temperature-sensitive element according to claim 5, is characterized in that: described metal dust is selected from: one in copper, nickel, cobalt, iron, tungsten, tin, lead, silver, gold, platinum or its alloy and composition thereof.
7. New PTC temperature-sensitive element according to claim 5, is characterized in that: described conductivity ceramics powder is selected from: the mixture of one or more among metal nitride, metal carbides, metal boride, metal silicide.
8. New PTC temperature-sensitive element according to claim 1, is characterized in that: described metal forming is containing rough surface, and this rough surface and described conducing composite material layer are combined closely.
9. New PTC temperature-sensitive element according to claim 1, is characterized in that: the described conducing composite material layer with resistance positive temperature coefficient effect and described metal forming of combining closely in the conducing composite material layer upper and lower surface with resistance positive temperature coefficient effect are serially connected with in protected circuit by described conductive component.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510138582.4A CN104681222A (en) | 2015-02-04 | 2015-03-27 | Novel PTC thermosensitive element |
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| CN2015100573756 | 2015-02-04 | ||
| CN201510057375 | 2015-02-04 | ||
| CN201510138582.4A CN104681222A (en) | 2015-02-04 | 2015-03-27 | Novel PTC thermosensitive element |
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| CN201520177750.6U Active CN205069250U (en) | 2015-02-04 | 2015-03-27 | Novel PTC temperature sensitive element |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106280365A (en) * | 2016-08-09 | 2017-01-04 | 安徽省宁国天成电工有限公司 | The critesistor of a kind of quick response and application thereof |
| CN106467412A (en) * | 2016-05-20 | 2017-03-01 | 济南圣泉集团股份有限公司 | A kind of PTC inorganic composite materials and preparation method thereof, application |
| CN107768054A (en) * | 2017-09-25 | 2018-03-06 | 江苏时瑞电子科技有限公司 | A kind of thermistor copper electrode barrier layer and preparation method thereof |
| CN108091461A (en) * | 2017-11-23 | 2018-05-29 | 苏州南尔材料科技有限公司 | A kind of preparation method of ZnO varistor |
| CN108760835A (en) * | 2018-06-26 | 2018-11-06 | 合肥萃励新材料科技有限公司 | A kind of benzene homologues gas detecting element |
| CN118444445A (en) * | 2024-07-04 | 2024-08-06 | 西安西古光通信有限公司 | Flame-retardant optical cable |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2592628A1 (en) * | 2010-07-08 | 2013-05-15 | Shanghai Changyuan Wayon Circuit Protection Co., Ltd. | Conductive composite material with positive temperature coefficient of resistance and over-current protection component |
| CN103762051A (en) * | 2013-12-30 | 2014-04-30 | 深圳市慧瑞电子材料有限公司 | High-holding current PPTC (polymeric positive temperature coefficient) overcurrent protector and manufacturing method thereof |
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2015
- 2015-03-27 CN CN201510138582.4A patent/CN104681222A/en active Pending
- 2015-03-27 CN CN201520177750.6U patent/CN205069250U/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2592628A1 (en) * | 2010-07-08 | 2013-05-15 | Shanghai Changyuan Wayon Circuit Protection Co., Ltd. | Conductive composite material with positive temperature coefficient of resistance and over-current protection component |
| CN103762051A (en) * | 2013-12-30 | 2014-04-30 | 深圳市慧瑞电子材料有限公司 | High-holding current PPTC (polymeric positive temperature coefficient) overcurrent protector and manufacturing method thereof |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106467412A (en) * | 2016-05-20 | 2017-03-01 | 济南圣泉集团股份有限公司 | A kind of PTC inorganic composite materials and preparation method thereof, application |
| CN106280365A (en) * | 2016-08-09 | 2017-01-04 | 安徽省宁国天成电工有限公司 | The critesistor of a kind of quick response and application thereof |
| CN107768054A (en) * | 2017-09-25 | 2018-03-06 | 江苏时瑞电子科技有限公司 | A kind of thermistor copper electrode barrier layer and preparation method thereof |
| CN107768054B (en) * | 2017-09-25 | 2019-07-19 | 江苏时恒电子科技有限公司 | A kind of thermistor copper electrode barrier layer and preparation method thereof |
| CN108091461A (en) * | 2017-11-23 | 2018-05-29 | 苏州南尔材料科技有限公司 | A kind of preparation method of ZnO varistor |
| CN108760835A (en) * | 2018-06-26 | 2018-11-06 | 合肥萃励新材料科技有限公司 | A kind of benzene homologues gas detecting element |
| CN118444445A (en) * | 2024-07-04 | 2024-08-06 | 西安西古光通信有限公司 | Flame-retardant optical cable |
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| Publication number | Publication date |
|---|---|
| CN205069250U (en) | 2016-03-02 |
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