CN103762051A - High-holding current PPTC (polymeric positive temperature coefficient) overcurrent protector and manufacturing method thereof - Google Patents
High-holding current PPTC (polymeric positive temperature coefficient) overcurrent protector and manufacturing method thereof Download PDFInfo
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Abstract
The invention discloses a high-holding current PPTC (polymeric positive temperature coefficient) overcurrent protector which comprises a PPTC conductive material layer and metal foils attached to the upper and lower surfaces of the PPTC conductive material layer, wherein metal electrodes are welded on the surfaces of the two metal foils. The volume resistivity of the PPTC conductive material layer is lower than 0.05(omega).cm, and the PPTC conductive material layer is formed by mixing 4-20% of crystalline polymer, 0.5-10% of interfacial compatilizer, 75-95% of conductive ceramic powder and 0.1-5% of conductive carbon black all by mass; the volume resistivity of the metal electrodes is lower than 2.0mu(omega).cm. The PPTC overcurrent protector disclosed by the invention has the advantages of small size, low resistance, high holding current and good voltage endurance capability and resistance stability, and can be applied to the overcurrent and overtemperature protection of the electronic equipment with high current discharge such as a high-power lithium ion battery pack, a power supply and the like.
Description
Technical field
The present invention relates to positive temperature coefficient (Positive temperature coefficient, PTC) overflow protecting element technical field, specifically refer to a kind of high maintenance electric current PPTC overcurrent protector and manufacture method thereof.
Background technology
Macromolecular thermosensitive resistor, refer to and utilize the resistance temperature characteristic that makes the electric conductive polymer of conductivity variation by thermal expansion, be PTC(Positive temperature coefficient) characteristic, carry out the element of connecting and disconnecting circuit, be called for short PPTC thermistor.PPTC device is generally filled in the polyolefine material of crystallization by conductive filler and makes.PPTC device can be excessive at electric current, circuit is shielded during excess Temperature.PPTC device is serially connected in circuit, and under normal circumstances, its resistance is very little, and loss is also very little, does not affect circuit and normally works; But when there being overcurrent (short circuit) to occur, its temperature raises, and its resistance also sharply raises thereupon, reaches the effect of Limited Current, avoids damaging other components and parts in circuit.And after fault is got rid of, PPTC device temperature declines, its resistance value is restored to low resistance state.Based on the over-current protective feature of PPTC device excellence, make it in fields such as household electrical appliances, computer, communication, consumer electronics, battery, automobile electrical micro-machines, obtain application widely.
Along with the high-multiplying power discharge lithium ion battery for the application such as Wireless Power Tools, electric bicycle and stand-by power supply or the fast development in battery pack market, for the requirement of the circuit protection of battery system, improve gradually.At present, for the protection of large capacity high-multiplying power discharge power supply, be to adopt the method that IC integrated circuit adds FET field-effect transistor and add overflow protecting element fuse of controlling mostly.Although fuse can play to great current cell the effect of overcurrent protection, it cannot provide overheat protector and irrecoverable, and therefore much battery manufacturer is recoverable PPTC overcurrent protector by change of fuse.But; although current PPTC overcurrent protector has overcurrent and excess temperature double protection functions and self recovery; but its chip material generally adopts carbon black to do conductive filler; the resistivity (being greater than 0.1 Ω .cm) of carbon black itself has limited PPTC device and has been difficult to accomplish very low resistance value, thereby causes PPTC device to be difficult to reach the higher electric current that maintains.In the specification of current conventional PPTC element, high maintenance electric current is 15A, but it has very large size.If reach above-mentioned power protection required maintain electric current 15A 30A even above; by the manufacture method of conventional P PTC device; need to continue to increase chip area; but because chip size is too large; cause the overcurrent protection ability of PPTC greatly to reduce and exist the restriction of installing space, thereby cannot meet instructions for use.And electric current, fast motion, small size are the current main developing direction of PPTC device greatly.Therefore,, in order to make PPTC thermal-sensitive electric resistance device can meet the requirement to overcurrent protection such as high-multiplying power discharge power supply, need to develop a kind of novel good PPTC device of small size, high maintenance electric current and resistance stability that has.
Summary of the invention
The object of this invention is to provide a kind of high maintenance electric current PPTC overcurrent protector and manufacture method thereof; make that PPTC overcurrent protector has ultralow resistance value, the little chip size of comparing with conventional PPTC device; and have exceed 15A the highest 30A maintain electric current; and good resistance stability, thereby can be for overcurrent and the overtemperature protection of the electronic electric equipment of the heavy-current discharges such as high-power lithium ion battery group, stand-by power supply.
To achieve these goals, technical scheme of the present invention is a kind of high maintenance electric current PPTC overcurrent protector, comprise that two tinsels and are stacked at the middle PPTC conductive material layer of described two tinsels, described two tinsel outer surfaces are all welded with metal electrode; Described PPTC conductive material layer has the specific insulation lower than 0.05 Ω .cm; The specific insulation of described metal electrode is less than 2.0 μ Ω .cm; Described PPTC conductive material layer comprises crystalline polymer, interfacial compatibilizer, conductivity ceramics powder and conductive black, the ratio of each component, according to mass percent, be, 4～20% organic polymer, 0.5～10% graft modification polymer, 75～95% conductivity ceramics powder, 0.1～5% conductive black, in described PPTC conductive material layer, the component sum of each material is 100%.
Further, described crystalline polymer is crystallinity olefin polymer, and this crystallinity olefin polymer is selected from high density polyethylene (HDPE) (HDPE), low density polyethylene (LDPE) (LDPE), linear low density polyethylene (LLDPE) (LLDPE) and Kynoar (PVDF) one or more.
Further, described interfacial compatibilizer is maleic anhydride graft olefin polymer, is selected from the one in maleic anhydride graft high density polyethylene (HDPE), maleic anhydride graft low density polyethylene (LDPE) and maleic anhydride graft linear low density polyethylene (LLDPE).Maleic anhydride grafting ratio is greater than 1.0%.
Further, the particle size of described conductivity ceramics powder is between 0.1 ~ 50 μ m, and described conductivity ceramics powder is anaerobic conductivity ceramics powder.
Further, the particle size of described conductivity ceramics powder is between 0.1 ~ 30 μ m.
Further, the particle size of described conductivity ceramics powder is between 0.1 ~ 10 μ m.
Further, the specific insulation of described conductivity ceramics powder is less than 100 μ Ω .cm.
Further, described conductivity ceramics powder is selected from titanium carbide, tungsten carbide, zirconium carbide, vanadium carbide, titanium boride, titanium nitride one or more.
Further, the average grain diameter of described conductive black is 20 ~ 120nm, and oil factor is 40cm
3/ 100g ~ 200cm
3/ 100g.
Further, the average grain diameter of described conductive black is 30 ~ 100nm, and oil factor is 60 ~ 150cm
3between/100g.
Further, described tinsel thickness is between 0.15 ~ 0.35 μ m.
Further, described tinsel is selected from the one in Copper Foil, nickel foil, nickel plating Copper Foil.
Further, for improving the adhesive strength between tinsel and described organic polymer, the wherein one side of described tinsel is through roughening treatment.
Further, for making PPTC device there is lower resistance value and high maintenance electric current, require the metal electrode of PPTC overcurrent protector to there is lower resistivity, therefore, described metal electrode material selection metallic copper or tin-coated copper.
Further; for making PPTC overcurrent protector there is the higher electric current that maintains; require the sectional area of metal electrode to adapt with the electric current that maintains of device; thereby the Joule heat that the electric current of make to flow through device and electrode produces and the balance of heat radiation; therefore, the sectional area of described metal electrode is between 0.7 ~ 3.0mm
2.
Further, two tinsels and middle PPTC conductive material layer form PPTC chip jointly, and the area of described PPTC chip is less than 300 mm
2.
Another kind of technical scheme of the present invention provides a kind of manufacture method of high maintenance electric current PPTC overcurrent protector, comprises the following steps:
1) described crystalline polymer, interfacial compatibilizer, conductivity ceramics powder and conductive black are joined in banbury according to the weight ratio of 4～20%:0.5～10%:75～95%:0.1～5%, banburying 10 ~ 30min at 10 ~ 60 ℃ more than the fusing point of described crystalline polymer, obtain PPTC electric conducting material, again through mill pulling-on piece, hot press mold pressing, obtaining thickness is the PPTC conductive material layer of 0.35 ~ 0.40mm;
2) above-mentioned PPTC conductive material layer is put into mould, the while, two tinsels were placed on respectively upper surface and the lower surface of PPTC material layer, through hot press pressing, obtained the complex of PPTC electric conducting material and tinsel;
3) complex of described PPTC material and metal forming is struck out to PPTC chip, by PPTC chip more than the fusing point of described crystalline polymer 10～60 ℃ place 60 minutes, then Slow cooling is to room temperature;
4) the described PPTC chip after heat treatment is cross-linked by high-power electron beam or gamma-ray irradiation, and irradiation dose is 5 to 100Mrads.
Further, in solder furnace or Reflow Soldering equipment, PPTC chip upper and lower surface good irradiation being welded to two metal electrodes, then through Ultrasonic Cleaning, make PPTC thermistor element.
Further, in step 1) in, the Temperature Setting of described banbury is higher than 10～60 ℃ of the fusing points of described crystalline polymer.
Further, in step 2) in, being compounded on hot press of described PPTC conductive material layer and metal forming carried out, and the temperature of described hot press is higher than 10～60 ℃ of the fusing points of described crystalline polymer.
Further, in step 3) in, described cooling be Slow cooling, cooldown rate is lower than 40 ℃/min.
Beneficial effect of the present invention is: the PPTC conductive material layer of high maintenance electric current PPTC overcurrent protector of the present invention has the specific insulation lower than 0.05 Ω .cm.PPTC overcurrent protector of the present invention have exceed 15A the superelevation of the highest 30A maintain electric current.And PPTC overcurrent protector of the present invention has than the little a lot of chip size of the conventional P PTC overcurrent protector that maintains equally electric current, has good proof voltage ability and resistance stability simultaneously.Thereby, can be for overcurrent and the overtemperature protection of the electronic electric equipment of the heavy-current discharges such as high-power lithium ion battery group, stand-by power supply, and the high electric current PPTC of low resistance of the present invention overcurrent protector manufactures easyly, and production efficiency is high.
Accompanying drawing explanation
Fig. 1 is PPTC chip schematic diagram of the present invention;
Fig. 2 is PPTC overcurrent protector schematic diagram of the present invention.
Reference numeral:
1-PPTC conductive material layer; 2-tinsel; 3-PPTC chip; 4-metal electrode; 5-PPTC overcurrent protector.
Embodiment
In order more clearly to understand technology contents of the present invention, especially exemplified by following examples, describe composition and the manufacturing process of PPTC overcurrent protector 5 of the present invention in detail.
Embodiment 1
Composition and the weight ratio of the PPTC electric conducting material of the present embodiment are as follows:
High density polyethylene (HDPE) (HDPE, JV040, the molten finger: 5.0g/10min, density 0.968g/cm of 12.2wt%
3, 135 ℃ of fusing points, Mitsubishi changes into company), the maleic anhydride grafted polyethylene (Grafted-PE of 1.8wt%, HD900E, percent grafting 1.2 wt%, Nanjing Hua Dou scientific & technical corporation), carbonized titanium powder (titanium carbide-1 of 84.8wt%, Fisher particle size 2 ~ 4 μ m, ρ=61 μ Ω .cm, density 4.93 g/cm
3), carbon black (Raven 430, particle diameter 82nm, the DBP value 78cm of 1.2wt %
3/ 100g, Columbian company).
According to weight ratio, weigh, in order, it is in 160 ℃, the banbury of rotating speed 30r/min that HDPE and Grafted-PE are joined to design temperature, banburying extremely fusing in 4 minutes, then add carbon black banburying 1 minute, finally add carbonized titanium powder banburying 15 minutes, obtain having the electric conducting material of ptc characteristics.
By above-mentioned PPTC electric conducting material, at mill (130 ℃ of design temperatures) pulling-on piece, making thickness is 0.35 ~ 0.40mm, the long and wide PPTC conductive material layer 1 that is 120mm; PPTC conductive material layer 1 is put into mould, in the upper and lower surface of PPTC conductive material layer 1, put the tinsel 2 that two thickness are 35 μ m simultaneously, put into hot press, hot press Temperature Setting 180 is spent, pressure setting 15MPa, it is that 0.30 ~ 0.35mm, length and width are the PPTC electric conducting material of 120mm and the complex of tinsel 2 that hot pressing 10min obtains thickness; To PPTC material and metal forming complex annealing heat treatment, heat-treat condition is 100 ℃/4 hours, then crosslinked with high-energy electron beam irradiation, dosage 100Mrad.
PPTC material good after irradiation and metal forming complex are die-cut into the PPTC chip 3 of 10.0 × 12.5mm.
By Reflow Soldering equipment, by PPTC chip good irradiation 3 upper and lower surface welding welding pair of metal electrodes 4, metal electrode 4 is the tinned wird of diameter of phi 1.0mm, then through Ultrasonic Cleaning, makes 5 of PPTC overcurrent protectors.
Measure resistance the volume calculated electricalresistivityρ of PPTC chip 3 when room temperature
0(Ω .cm), the resistance value R of PPTC overcurrent protector 5 under measurement room temperature
0(m Ω), the electric current I that maintains of testing PPTC overcurrent protector 5 when room temperature
holdand the operate time T of device when maintaining electric current for 2 times (A)
trip(S), test component resistance change rate and continue the resistance change rate of energising after 24 hours under 16V/50A after surge 50 times under 16V/100A.The physical properties test data of PPTC overcurrent protector 5 is listed in table 2.
According to manufacturing PPTC overcurrent protector 5 with formula rate and method identical described in embodiment 1, but chip size changes 13.5 × 16.0mm into, and metal electrode 4 makes the tinned wird that diameter is Φ 1.5mm into.According to the physical property of testing PPTC overcurrent protector 5 with identical mode described in embodiment 1, the results are shown in Table 2.
Embodiment 3
According to manufacturing PPTC overcurrent protector 5 with formula rate and method identical described in embodiment 1, but chip size changes 16.0 × 18.0mm into, and metal electrode 4 makes the tinned wird that diameter is Φ 1.8mm into.According to the physical property of testing PPTC overcurrent protector 5 with identical mode described in embodiment 1, the results are shown in Table 2.
Embodiment 4
According to manufacturing PPTC overcurrent protector 5 with method identical described in embodiment 1, but with titanium carbide-2(Fisher particle size 1 ~ 1.5 μ m of 75wt%, ρ=61 μ Ω .cm, density 4.93 g/cm
3) replace the 84.2wt% in embodiment 1 titanium carbide-1(Fisher particle size 2 ~ 4 μ m).Correspondingly, change the content of high density polyethylene (HDPE) (HDPE) into 20wt% by 12.5wt%, the content of grafted polyethylene (Grafted-PE) changes 3wt% into by 2wt%, and conductive black content changes 2.0wt% into by 1.3wt%.Change chip size into 13.5 × 16.0mm, metal electrode 4 makes the tinned wird that diameter is Φ 1.5mm into simultaneously.According to the physical property of testing PPTC overcurrent protector 5 with identical mode described in embodiment 1, the results are shown in Table 2.
Embodiment 5
According to manufacturing PPTC overcurrent protector 5 with method identical described in embodiment 1, but with tungsten carbide powder (Fisher particle size 0.8 ~ 1 μ m, specific insulation ρ=19 μ Ω .cm, density 15.6 g/cm of 91wt%
3) replace the 84.2wt% in embodiment 1 titanium carbide-1(Fisher particle size 2 ~ 4 μ m).Correspondingly, change high density polyethylene (HDPE) (HDPE) content into 7.3wt% by 12.5wt%, the ratio of grafted polyethylene (Grafted-PE) changes 1.0wt% into by 2wt%, and carbon black ratio changes 0.7wt% into by 1.3wt%.Change chip size into 15.5 × 18mm, metal electrode 4 makes the tinned wird that diameter is Φ 1.5mm into simultaneously.According to the physical property of testing PPTC overcurrent protector 5 with identical mode described in embodiment 1, the results are shown in Table 2.
Embodiment 6
According to manufacturing PPTC overcurrent protector 5 with method identical described in embodiment 1, but with tungsten carbide powder (Fisher particle size 0.8 ~ 1 μ m, specific insulation ρ=19 μ Ω .cm, density 15.6 g/cm of 93.3wt%
3) replace the 84.2wt% in embodiment 1 titanium carbide-1(Fisher particle size 2 ~ 4 μ m).Correspondingly, change high density polyethylene (HDPE) (HDPE) content into 5.3wt% by 12.5wt%, the content of grafted polyethylene (Grafted-PE) changes 0.8wt% into by 2wt%, and conductive black content changes 0.6wt% into by 1.3wt%.Change chip size into 16.0 × 18.0mm, metal electrode 4 makes the tinned wird that diameter is Φ 1.8mm into simultaneously.According to the physical property of testing PPTC overcurrent protector 5 with identical mode described in embodiment 1, the results are shown in Table 2.
Embodiment 7
According to method PPTC overcurrent protector 5 identical described in embodiment 1; but the crystalline polymer during formula is formed is with the high density polyethylene (HDPE) (HDPE, JV040) of 8.0wt% and low density polyethylene (LDPE) (LDPE, the 2404AN00 of 5.5wt%; molten 4.2g/10min, the density 0.925g/cm of referring to
3, 110 ℃ of fusing points, Sabic company) and replace the high density polyethylene (HDPE) (HDPE, JV040) of 12.2wt% in embodiment 1.Correspondingly, change titanium carbide-1(Fisher particle size 2 ~ 4 μ content m) into 83.2wt% by 84.8wt%, the content of grafted polyethylene (Grafted-PE) changes 2.0wt% into by 1.8wt%, and conductive black content changes 1.3wt% into by 1.2wt%.According to the physical property of testing PPTC overcurrent protector 5 with identical mode described in embodiment 1, the results are shown in Table 2.
Embodiment 8
According to manufacturing PPTC overcurrent protector 5 with method identical described in embodiment 1, but by the crystalline polymer in formula composition low density polyethylene (LDPE) (LDPE, 2404AN00, molten 4.2g/10min, the density 0.925g/cm of referring to 2.7wt%
3, Sabic company) and the Kynoar of 2.0wt% (PVDF, SOLEF1010, molten 2.0g/10min, the density 1.78g/cm of referring to
3, 174 ℃ of fusing points, Su Wei company) and replace the high density polyethylene (HDPE) (HDPE, JV040) of 12.2wt% in embodiment 1.While is with tungsten carbide powder (Fisher particle size 0.8 ~ 1 μ m, specific insulation ρ=19 μ Ω .cm, density 15.6 g/cm of 94.1wt%
3) replace the 84.8wt% in embodiment 1 titanium carbide-1(Fisher particle size 2 ~ 4 μ m).Accordingly, change grafted polyethylene (Grafted-PE) content into 0.7wt% by 1.8wt%, conductive black content changes 0.5wt% into by 1.2wt%.Device making technics aspect: banbury design temperature is adjusted into 200 ℃, hot press design temperature is adjusted into 230 ℃, PPTC force fit plate heat treatment temperature is adjusted into 140 ℃, changes chip size into 16.0 × 18.0mm simultaneously, and metal electrode 4 makes the tinned wird that diameter is Φ 1.8mm into.According to the physical property of testing PPTC overcurrent protector 5 with identical mode described in embodiment 1, the results are shown in Table 2.
Comparative example 1
The conventional PPTC overcurrent protector 5 take carbon black as conducting medium, composition and the mass ratio of its PPTC electric conducting material are as follows:
High density polyethylene (HDPE) (HDPE, JV040, the molten finger: 5.0g/10min, density 0.968g/cm of 40 wt %
3, 135 ℃ of fusing points, Mitsubishi changes into), the maleic anhydride grafted polyethylene (Grafted-PE, HD900E, percent grafting 1.2wt%, Nanjing Hua Dou scientific & technical corporation) of 5wt%, carbon black (Raven 430, particle diameter 82nm, the DBP value 78cm of 55wt%
3/ 100g, Columbian company).
The manufacture method of PPTC electric conducting material and device is with embodiment 1, but chip size changes 24 × 24mm into, and metal electrode 4 makes the tinned wird that diameter is Φ 1.0mm into.And according to the physical property of testing PPTC overcurrent protector 5 with identical mode described in embodiment 1, the results are shown in Table 2.
Composition and the mass percent of the PPTC electric conducting material that PPTC overcurrent protector 5 of the present invention is used, as shown in table 1.
Table 1
Note: material composition unit: mass percent wt%; The unit of chip size (long × wide) and electrode specification (diameter): millimeter (mm).
Table 2
| Chip volume electricalresistivityρ 0 (Ω.cm) | Device room temperature resistance R 0(mΩ) | Maintain electric current I hold (A) | Operate time T trip(S) | Withstand voltage resistance varying-ratio | The resistance varying-ratio of resistance to stream | Chip area (mm 2) | Pin sectional area (mm 2) | |
| Embodiment 1 | 0.023 | 3.5 | 16 | ＜50 | 16.3% | 20.5% | 125 | 0.785 |
| |
0.023 | 1.7 | 25 | ＜50 | 18.1% | 23.0% | 216 | 1.766 |
| Embodiment 3 | 0.023 | 1.3 | 30 | ＜50 | 18.2% | 25.6% | 288 | 2.543 |
| Embodiment 4 | 0.029 | 2.0 | 20 | ＜50 | 16.4% | 19.5% | 216 | 2.543 |
| Embodiment 5 | 0.025 | 1.8 | 25 | ＜50 | 18.0% | 23.7% | 216 | 2.543 |
| Embodiment 6 | 0.023 | 1.2 | 30 | ＜50 | 20.2% | 29.1% | 288 | 2.543 |
| Embodiment 7 | 0.024 | 3.2 | 16 | ＜50 | 15.3% | 20.8% | 125 | 0.785 |
| Embodiment 8 | 0.024 | 1.3 | 30 | ＜50 | 19.4% | 27.7% | 288 | 2.543 |
| Comparative example 1 | 0.35 | 3.5 | 16 | ＜150 | 110.3% | 80.2% | 576 | 0.785 |
Note: in table, the data of experimental test are mean value.
By table 1; can know; the high maintenance electric current PPTC overcurrent protector 5 that the present invention manufactures, its PPTC conductive material layer 1 has the resistivity lower than 0.03 Ω .cm when room temperature, in the case of the metal pins of selecting suitable dimension, can accomplish the electric current that maintains up to 30A.The data of comparing embodiment 1 and comparative example can be found out, are in the situation that maintains electric current of 16A equally, and embodiment 1 adopts chip area (125 mm of the PPTC that the present invention manufactures
2) be only that comparative example adopts the about 1/5 of PPTC chip 3 areas that conventional method manufactures, and the PPTC overcurrent protector 5 of embodiment 1 at 2 times, to maintain operate times under electric current be only 1/3 of the operate time of PPTC in comparative example.In addition, the resistance stability that relatively withstand voltage the and resistance to stream of the PPTC of the present invention and conventional method impacts, PPTC overcurrent protector 5 of the present invention shows very excellently.
To sum up; the high maintenance electric current PPTC overcurrent protector 5 of the PPTC electric conducting material that comprises ultralow resistance of the present invention has low resistance, small size and good proof voltage ability and resistance stability, thereby can have for high-power lithium ion battery group, stand-by power supply etc. overcurrent and the overtemperature protection of the electronic electric equipment of the large current protection device of demand.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (10)
1. a high maintenance electric current PPTC overcurrent protector, comprises PPTC conductive material layer and pastes the tinsel on upper and lower two surfaces of described PPTC material layer, it is characterized in that: the outer surface of described two tinsels is all welded with metal electrode; Described PPTC conductive material layer has the specific insulation lower than 0.05 Ω .cm; The specific insulation of described metal electrode is less than 2.0 μ Ω .cm; Described PPTC conductive material layer comprises crystalline polymer, interfacial compatibilizer, conductivity ceramics powder and conductive black, the ratio of each component, according to mass percent, be, 4～20% crystalline polymer, 0.5～10% compatilizer, 75～95% conductivity ceramics powder, 0.1～5% conductive black, in described PPTC conductive material layer, the component sum of each material is 100%.
2. high maintenance electric current PPTC overcurrent protector according to claim 1; it is characterized in that: described crystalline polymer is crystallinity olefin polymer, this crystallinity olefin polymer is selected from high density polyethylene (HDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE) and Kynoar one or more.
3. high maintenance electric current PPTC overcurrent protector according to claim 1; it is characterized in that: described interfacial compatibilizer is maleic anhydride graft olefin polymer, be selected from the one in maleic anhydride graft high density polyethylene (HDPE), maleic anhydride graft low density polyethylene (LDPE) and maleic anhydride graft linear low density polyethylene (LLDPE).
4. high maintenance electric current PPTC overcurrent protector according to claim 1; it is characterized in that: described conductivity ceramics powder; particle size is between 0.1 ~ 50 μ m; specific insulation is less than 100 μ Ω .cm, is selected from titanium carbide, tungsten carbide, zirconium carbide, vanadium carbide, titanium boride and titanium nitride one or more.
5. high maintenance electric current PPTC overcurrent protector according to claim 1, is characterized in that: the average grain diameter of described conductive black is 20 ~ 120nm, and oil factor is 40cm
3/ 100g ~ 200cm
3/ 100g.
6. high maintenance electric current PPTC overcurrent protector according to claim 1, is characterized in that: described metal electrode material selection metallic copper or tin-coated copper.
7. high maintenance electric current PPTC overcurrent protector according to claim 1, is characterized in that: the sectional area of described metal electrode is between 0.7 ~ 3.0mm
2.
8. high maintenance electric current PPTC overcurrent protector according to claim 1 and 2, is characterized in that: two tinsels and middle PPTC conductive material layer form PPTC chip jointly, and the area of described PPTC chip is less than 300 mm
2.
9. a manufacture method for high maintenance electric current PPTC overcurrent protector according to claim 1, is characterized in that: comprise the following steps:
1) described crystalline polymer, interfacial compatibilizer, conductivity ceramics powder and conductive black are joined in banbury according to the weight ratio of 4～20%:0.5～10%:75～95%:0.1～10%, banburying 10 ~ 30min at 10 ~ 60 ℃ more than the fusing point of described crystalline polymer, obtain PPTC electric conducting material, again through mill pulling-on piece, hot press mold pressing, obtaining thickness is the PPTC conductive material layer of 0.35 ~ 0.40mm;
2) above-mentioned PPTC conductive material layer is put into mould, the while, two tinsels were placed on respectively the upper and lower surface of PPTC conductive material layer, through hot press pressing, obtained the complex of PPTC electric conducting material and tinsel;
3) described PPTC material and tinsel complex are struck out to PPTC chip, by PPTC chip more than the fusing point of described crystalline polymer 10～60 ℃ place 60 minutes, then Slow cooling is to room temperature;
4) the described PPTC chip after heat treatment is cross-linked by high-power electron beam or gamma-ray irradiation, and irradiation dose is 5 to 100Mrads.
10. the manufacture method of high maintenance electric current PPTC overcurrent protector according to claim 9; it is characterized in that: in solder furnace or Reflow Soldering equipment, PPTC chip upper and lower surface good irradiation is welded to two metal electrodes; then through Ultrasonic Cleaning, make PPTC over-current protection device.
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| CN104681222A (en) * | 2015-02-04 | 2015-06-03 | 上海长园维安电子线路保护有限公司 | Novel PTC thermosensitive element |
| CN105139984A (en) * | 2015-09-09 | 2015-12-09 | 上海长园维安电子线路保护有限公司 | PTC (Positive Temperature Coefficient) protection element capable of maintaining ultralarge current |
| CN105590710A (en) * | 2014-10-22 | 2016-05-18 | 富致科技股份有限公司 | Positive temperature coefficient over-current protection component |
| CN109509599A (en) * | 2017-09-15 | 2019-03-22 | 聚鼎科技股份有限公司 | Over-current protecting element |
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| CN113410015A (en) * | 2021-06-21 | 2021-09-17 | 北京复通电子科技有限责任公司 | Low-resistivity high-voltage PPTC material and preparation method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105590710A (en) * | 2014-10-22 | 2016-05-18 | 富致科技股份有限公司 | Positive temperature coefficient over-current protection component |
| CN104681222A (en) * | 2015-02-04 | 2015-06-03 | 上海长园维安电子线路保护有限公司 | Novel PTC thermosensitive element |
| CN105139984A (en) * | 2015-09-09 | 2015-12-09 | 上海长园维安电子线路保护有限公司 | PTC (Positive Temperature Coefficient) protection element capable of maintaining ultralarge current |
| CN109509599A (en) * | 2017-09-15 | 2019-03-22 | 聚鼎科技股份有限公司 | Over-current protecting element |
| CN109509599B (en) * | 2017-09-15 | 2021-04-09 | 聚鼎科技股份有限公司 | Overcurrent protection element |
| CN109903939A (en) * | 2019-01-28 | 2019-06-18 | 深圳市金瑞电子材料有限公司 | A kind of strong resistance to weldering macromolecular positive temperature coefficient thermosensitive resistor chip |
| CN111834072A (en) * | 2019-04-15 | 2020-10-27 | 富致科技股份有限公司 | PTC circuit protection device |
| CN111834072B (en) * | 2019-04-15 | 2023-07-28 | 富致科技股份有限公司 | PTC circuit protection device |
| CN113410015A (en) * | 2021-06-21 | 2021-09-17 | 北京复通电子科技有限责任公司 | Low-resistivity high-voltage PPTC material and preparation method and application thereof |
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