CN1378217A - Over-current protector - Google Patents
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- CN1378217A CN1378217A CN 01110507 CN01110507A CN1378217A CN 1378217 A CN1378217 A CN 1378217A CN 01110507 CN01110507 CN 01110507 CN 01110507 A CN01110507 A CN 01110507A CN 1378217 A CN1378217 A CN 1378217A
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Abstract
The over-current protector includes one current detecting element and two electrodes. The current detecting element is formed with composite conducting material with positive temperature coefficient and includes at least one polymer part, one conducting stuffing part and one non-conducting stuffing part. It features that at least one polymer part has smelting point higher than 110 deg.c and softening point lower than 110 deg.c. In addition, the accumulated irradiation amount of radioactive ray is maintained over 20 Mrads to raise the thermal stability and electrical stability of the over-current protector.
Description
The present invention relates to a kind of overcurrent protective device, more specifically, relating to the conducing composite material with positive temperature coefficient is the overcurrent protective device of current measuring element.
For preventing the battery overcurrent (over-current) or the overcurrent protective device of mistake high temperature (over-temperature) phenomenon; extensive use along with present portable electronic instrument; for example mobile phone, notebook computer, hand camera and personal digital assistant device (PDA) etc., its importance is also more and more remarkable.
Known battery overcurrent protective device is various, comprises Thermal Cutoffs (Thermal-Fuso), bimetallic protector or positive temperature coefficient (PTC:Positive ThermalCoefficient) overcurrent protective device etc.Wherein, since the PTC overcurrent protective device have need not change promptly reusable, to responsive to temperature and advantage such as reliable and stable; so be widely used in the overcurrent protection of battery at present; especially be applied to the overcurrent protective device of secondary cell, for example Ni-MH battery or lithium battery etc.
The PTC overcurrent protective device is to utilize a conducing composite material with positive temperature coefficient, as current measuring element.Because the resistance value of this positive temperature conducing composite material is sharp to the variations in temperature reaction, when normal behaviour in service, the resistance of PTC overcurrent protective device can be kept utmost point low value, makes circuit be able to normal operation.When but overcurrent (overcurrent) taking place when the improper use of battery or crossing the phenomenon of high temperature (over temperature), the resistance value of PTC overcurrent protective device can improve tens thousand of times moment to a high resistance state (for example 10
4Ohm), and excessive electric current is offseted, to reach the purpose of protective circuit element and battery.
Generally speaking, the PTC overcurrent protective device need possess following characteristic:
1. low resistance:, have the circulation of a large amount of electric currents of moment once in a while even battery under the situation of regular picture (discharge), also can be stranded the demand of the electronic instrument of its circuit end.At this moment,, then can cause supply power voltage to descend (Voltage Drop), and cause the circuit of electronic instrument and other elements can't normal operation if the resistance value of PTC overcurrent protective device is too high.Therefore under normal behaviour in service, the resistance of PTC overcurrent protective device should keep less than 30 milliohms, and preferably less than 20 milliohms.
2. low switching temperature (Switching Temperature): when circuit temperature rose gradually, the resistance value of PTC overcurrent protective device can be converted to a high resistance state moment, and the temperature of this turnover is called switching temperature.Generally speaking, the switching temperature of PTC overcurrent protective device is preferably less than 100 ℃, under the situation of overcharging for a long time, can not cause damage because of itself temperature is too high with the protection battery.
Employed PTC conducing composite material in the PTC overcurrent protective device; be to have crystalline polymer blending conductive filler by one; for example carbon black or metal particle are formed, and this conducing composite material are reacted via the interlinkage (crosslinking) that carries out that radiation exposure makes again.The resistance of above-mentioned conducing composite material can at room temperature keep utmost point low value, and when temperature rising Dutch changed temperature, its resistance can be asked and is increased to a high resistance state in wink.
United States Patent (USP) the 5th, 801 discloses an overcurrent protective device No. 612, and employed polymer is the polyacrylic polymer of a Polyolefin and, forms a PTC conducing composite material with the conductive filler blending again.This PTC conducing composite material with two electrode pressings after, make this PTC conducing composite material carry out interlinkage reaction with radiation exposure.Because the disclosed fusing point of this Prior Art must be lower than 110 ℃; degree of crystallinity must be less than 40%; and therefore the accumulation exit dose of radiation exposure must can't be responded to overcurrent and change observantly less than 20Mrad under lower temperature, change to have a resistance and beat and protective circuit and battery.In addition, U.S. Patent number the 5th, 580,493 and 5,378,407 also disclose the composition of PTC conducing composite material respectively, but the polymer of its use is all the polyacrylic polymer of Polyolefin and.Because polyacrylic acid has the characteristic of easy suction, the electrical conductivity of conducing composite material is reduced, to the also reduction relatively of sensitivity of temperature.
A purpose of the present invention is to provide a kind of overcurrent protective device, and its resistance can be kept utmost point low value under normal operation, makes battery be able to normal running.But when the temperature of battery arrived a switching temperature, its resistance value then can be increased to a high resistance state moment to reduce electric current.
Another purpose of the present invention is providing a kind of method for preparing the battery overcurrent protective device, can be fast and prepare a stable and overcurrent protective device high to temperature susceplibility in a large number.
For achieving the above object and avoid the shortcoming of known technology, the present invention discloses a kind of overcurrent protective device, comprises a current measuring element and two electrodes.Wherein this current measuring element is formed by a PTC conducing composite material, comprises at least one polymer, a conductive filler and a non-conducting filler.The fusing point that it is characterized in that the employed polymer of this PTC conducing composite material is higher than 110 ℃, and it defends formula softening point (Vicat softing point) and be lower than 110 ℃, with the conductivity that increases overcurrent protective device and to the sensitivity of temperature.
The present invention more discloses a kind of method for preparing overcurrent protective device, comprises following step (a) to step (b).In step (a), at least one polymer, a conductive filler and a non-conducting filler are fully mixed to form a PTC conducing composite material.In step (b), this PTC conducing composite material and at least two electrodes are carried out pressing, to form a PTC sheet material.In step (c), with radiation exposure, and the irradiation metering of accumulation is at least 20Mrads, makes this PTC conducing composite material produce interlinkage reaction with this PTC sheet material.In step (d), die-cut this PTC sheet material is to form this overcurrent protective device.
Aforementioned and other purposes, advantage of the present invention and reach mode will be clearer according to following detailed description and accompanying drawing.
Fig. 1 is the profile of a preferred embodiment of overcurrent protective device of the present invention;
Fig. 2 is the profile of another preferred embodiment of overcurrent protective device of the present invention; And
Fig. 3 is the resistance value of overcurrent protective device of the present invention and the corresponding diagram of radioactive ray cumulative exposure.
Fig. 1 is the profile of a preferred embodiment of overcurrent protective device 10 of the present invention, comprises a current measuring element 13, two electrodes 11 and 12, and two metallic conduction sheets 14 and 15.This current measuring element 13 is to be that the conducing composite material of number (PTC) is formed by the positive temperature of a tool, and comprises an at least one polymer and a conductive filler (conductive filler).This electrode 11 and 12 fits in the both sides of this current measuring element 13, can be electrically connected to the both positive and negative polarity of battery supply.This two metallic conductions sheet 14 and 15 may not use for essential; When using, can fit in this two electrode 11 and 12 opposite sides, as the lead of surface adhering to a circuit board or battery with respect to this current measuring element 13.
Fig. 2 is the profile of another preferred embodiment of overcurrent protective device 10 of the present invention.Be that the direction that this two metallic conductions sheet 14 and 15 extends this electrode 11 and 12 is identical or different with the difference of Fig. 1.
The employed polymer of this PTC conducing composite material is made up of at least a polyolefin polymers, and for example polyethylene, polypropylene or poly-octene, its fusing point (peak meltingpoint) be greater than 110 ℃, improving degree of crystallinity, and strengthens the PTC effect; And it defends formula softening point (Vicat softing point) less than 110 ℃, to reach the purpose of low temperature overcurrent protection.The above-mentioned formula of defending softening point is according to ASTM, and the method for D1525 is measured and got.In addition, optional, metal dust black of this conductive filler or carbonized ceramic powder, and this carbonized ceramic powder for example titanium carbide or tungsten carbide from conductive carbon,
For toughness (toughness), the electrical conductivity (conductivity) that strengthens this current measuring element 13 reaches the susceptibility (sensitivity) to temperature, in this PTC conducing composite material, can add a non-conducting filler in addition.This non-conducting filler can be inorganic or organism, and the present invention does not have any restriction to this.This inorganic non-conducting filler for example is Yun magnesium oxide, titanium dioxide or calcium carbonate; And this organic non-conducting filler, be to be selected from following group: the derivative of silicon compounds, acrylic compounds, amine, sulfide, carboxylic acids, fatty acid and ester class and its esters or amorphous polymer (amorphous polymer), employed organic non-conducting filler is a zinc stearate in the preferred embodiment of the present invention.Moreover the PTC conducing composite material can add an additive in addition to strengthen its physical characteristic, and this additive comprises: compounds such as light initiator, cross linking agent, coupling agent, dispersant, stabilizer or antioxidant.
In an embodiment of the present invention, be earlier this polymer, conductive filler, non-conducting filler and additive to be carried out preliminary mixing and pulverizing, wherein, the percentage by weight of this polymer is between 20% to 80%, the preferably is between 30% to 70%; The percentage by weight of this conductive filler is between 20% to 90%, and the preferably is between 30% to 70%; The percentage by weight of this non-conducting filler is between 0.1% to 10%, and the preferably is between 0.5 to 5%, again said mixture is carried out batch mixing under high temperature, and mixture temperature is between 180 ℃ to 250 ℃, and the preferably is between 180 ℃ to 230 ℃.
Afterwards, this PTC conducing composite material and two sheet metals 11 and 13 carry out pressing to form a PTC sheet material.And this PTC conducing composite material forms a laminar current measuring element 13 and sheet metal fluid-tight engagement after pressing.The material of this sheet metal can be nickel, copper or its alloy, and as the usefulness of electrode.The mode of this pressing can be utilized and the PTC conducing composite material after the fusion is injected two sheet metals 11 and 12 in the mode of extruding be formed, or utilization forms conducing composite material and three sheet metals 11 and 12 with hot pressing.
With radiation exposure, make this PTC conducing composite material carry out interlinkage reaction (crosslink reaction) this PTC sheet material, to promote the thermal stability and the electric stability of element.The accumulation exit dose of radiation exposure is at least more than 20Mrads, and the preferably is between between the 25Mrad to 35Mrads.
After this PTC sheet material reacts through an interlinkage, with the die-cut formation of mould overcurrent protective device of the present invention.Its size is less than 120mm
2, the preferably is between 40mm
2To 80mm
2Between.Afterwards, the electrode of this overcurrent protective device up and down both sides can be mutually bonding with two metallic conduction sheets 14,15 in addition, so that as the lead that is electrically connected with battery plus-negative plate.In a preferred embodiment of the present invention, the material of this metallic conduction sheet 14,15 is the nickel sheet.
The current measuring element 13 of the present invention institute, its resistance coefficient is in 20 ℃ of (R
20) time be to be no more than 2.0ohm-cm, and its thickness is between between the 0.025mm to 0.25mm.
Fig. 3 is the resistance value of overcurrent protective device of the present invention and the corresponding diagram of radioactive ray cumulative exposure.Curve 31 is the 10Mrads radiation exposure, and curve 32 is the 20Mrads radiation exposure, and curve 33 is the 30Mrads radiation exposure.By among the figure as can be known, along with the increase of cumulative radiation dose, the interlinkage density of PTC electric conducting material also can increase, so its resistance value also increases thereupon.
Embodiment 1
With the polyethylene of percentage by weight 51% and the poly-octene polymer (Elite 5400 that is produced by Dow Chemical, its fusing point is 122.5 ℃, the formula softening point of defending is 102 ℃) with the conductive carbon black of percentage by weight 48% (N550 that is produced by Chinese synthetic rubber company), and percentage by weight is 1% a magnesium hydroxide (MGOH-650 that is produced by Ube Material Industries) with a fruit juice mixer high-speed mixing 3 minutes, above-mentioned composite material is slowly added in the mixing roll (Haake-600), under 200 ℃, carry out mixing 15 minutes with formation-PTC conducing composite material.Rotating speed when mixing is 40rpm between charge period, and behind reinforced the end, rotating speed is increased to 70rpm.PTC conducing composite material after the blanking is cut into pieces, with the nickel plating Copper Foil that two thickness are 0.05mm the fragment of conducing composite material is clamped up and down, wherein, the matsurface of this nickel plating Copper Foil is inwardly so that engage with current measuring element, the ferric piece that is 5mm with two thickness is clamped above-mentioned nickel plating Copper Foil up and down again, at last, the stainless steel substrates that is 1mm with two thickness clamps above-mentioned ferric piece to form a sandwich construction up and down again, with the hot pressing in hot press of above-mentioned sandwich construction, after 180 ℃ of hot press elder generation preheatings are kept 20 minutes, the beginning pressing, pressure is 50kg/cm
2, after 5 minutes pressure is increased to 150kg/cm
2, continue pressing 10 minutes, after pressing finishes ferric piece and stainless steel substrates are removed formation one PTC sheet material.In this PTC sheet material, conducing composite material forms a laminar current measuring element and nickel plating Copper Foil fluid-tight engagement after pressing, its thickness crow 0.13mm.
Make conducing composite material carry out interlinkage reaction with 60 irradiations of radioactive ray cobalt above-mentioned PTC sheet material, the cumulative dose of wherein shining radioactive ray is 30Mrad.The formation size is the overcurrent protective device of 5 * 12 * 0.13mm through mould is die-cut with the PTC sheet material behind the interlinkage again, and the nickel plating Copper Foil then constitutes two electrodes of this overcurrent protective device.
Two electrodes that two nickel sheets are bonded in overcurrent protective device respectively with tin cream are two sides up and down, and the size of nickel sheet is 4 * 16 * 0.127mm, the about 5mm of the protruding electrode of nickel sheet two ends after bonding.At last, after the processing of 85 ℃ of heating and-45 ℃ of annealing (anneal), its resistance can be reduced to 0.026ohm with said elements.
Above-mentioned overcurrent protective device is placed a temperature control baking box, the relation of resistance and temperature when measuring variations in temperature, the resistance (R in the time of 110 ℃
110) and breaking element surface temperature (tripsurface temperature) as shown in table 1.The measurement of breaking element surface temperature is that above-mentioned overcurrent protective device is cut off the power supply under 12V/10A, measures its surface temperature and gets with infrared thermometer under the state of outage.
Embodiment 2
With the polyethylene of percentage by weight 47% and the poly-octene polymer (Elite 5400 that is produced by Dow Chemical, its fusing point is 122.5 ℃, the formula softening point of defending is 102 ℃) with the conductive carbon black of percentage by weight 50% (N660 that is produced by Chinese synthetic rubber company), and percentage by weight is 3% hard zinc acetate (Aldrich Chemical) with fruit juice mixer high-speed mixing 3 minutes, above-mentioned composite material is slowly added in the mixing roll (Haake-600), under 200 ℃, carry out mixing 15 minutes to form a PTC conducing composite material.Rotating speed when mixing is 40rpm between charge period, and behind reinforced the end, rotating speed is increased to 70rpm.With two nickel plating Copper Foils walk around respectively the last steel wheel that is parallel to each other and down steel wheel and Copper Foil matsurface outwardly, the temperature of steel wheel is that 220 ℃ of pressure are 100kb/cm
2This PTC conducing composite material is pushed out with extruder, and make it by passing through between the narrow and small slot between steel wheel up and down, along with the rotation of steel wheel, the PTC conducing composite material can be pressed into a laminar current measuring element and with nickel plating Copper Foil fluid-tight engagement, and form a PTC sheet material.
Make conducing composite material carry out interlinkage reaction with 60 irradiations of radioactive ray cobalt above-mentioned PTC sheet material, the cumulative dose of wherein shining radioactive ray is 30Mrad.The formation size is the overcurrent protective device of 5 * 12 * 0.13mm through mould is die-cut with the PTC sheet material behind the interlinkage again, and the nickel plating Copper Foil then constitutes two electrodes of this overcurrent protective device.
Two nickel sheets are bonded in respectively with tin cream on two electrodes of this overcurrent protective device, and the size of nickel sheet is 4 * 16 * 0.127mm, the about 5mm of the protruding electrode of nickel sheet two ends after bonding.At last, after the processing of 85 ℃ of heating and 45 ℃ of annealing (anneal), its resistance can be reduced to 0.023ohm with said elements.
Above-mentioned overcurrent protective device is placed a temperature control baking box, the relation of resistance and temperature when measuring variations in temperature, its resistance (R in the time of 110 ℃
110) and breaking element surface temperature (trip surface temperature) as shown in table 1.The measurement of breaking element surface temperature is that above-mentioned overcurrent protective device is cut off the power supply under 12V/10A, measures its surface temperature and gets with infrared thermometer under the state of outage.
Comparative example 1
Implementation step and embodiment H order are 10Mrad but formed PTC sheet material shines the cumulative exposure of radioactive ray cobalt 60 together.
Above-mentioned overcurrent protective device is placed a temperature control baking box, and the plate of resistance and temperature is its resistance (R in the time of 110 ℃ when measuring variations in temperature
110) and breaking element surface temperature (trip surface temperature) as shown in table 1.The measurement of breaking element surface temperature is that above-mentioned overcurrent protective device is cut off the power supply under 12V/10A, measures its surface temperature and gets with infrared thermometer under the state of outage.
Comparative example 2
Implementation step is identical with embodiment 1, but the cumulative exposure of the PTC sheet material that is become irradiation radioactive ray cobalt 60 is 20Mrad.
Above-mentioned overcurrent protective device is placed a temperature control baking box, and the pass of resistance and temperature is its resistance (R in the time of 110 ℃ when measuring variations in temperature
110) and breaking element surface temperature (trip surface temperature) as shown in table 1.The measurement of breaking element surface temperature is that above-mentioned overcurrent protective device is cut off the power supply under 12V/10A, measures its surface temperature and gets with infrared thermometer under the shape of outage.
Comparative example 3
Implementation step is identical with embodiment 1, but the employed polymer of conducing composite material be high density polyethylene (HDPE) (by the platform company of moulding produce 8050, its fusing point is 136 ℃, the formula softening point of defending is 127 ℃).
Above-mentioned overcurrent protective device is placed a temperature control baking box, and the pass of resistance and temperature is its resistance (R in the time of 110 ℃ when measuring variations in temperature
110) and breaking element surface temperature (trip surface temperature) as shown in table 1.The measurement of breaking element surface temperature is that above-mentioned overcurrent protective device is cut off the power supply under 12V/10A, measures its surface temperature and gets with infrared thermometer under the state of outage.
Table 1
| Embodiment 1 | Embodiment 2 | Comparative example 1 | Comparative example 2 | Comparative example 3 | |
| Fusing point (℃) | 122.5 | ?122.5 | ?122.5 | ?122.5 | ?136 |
| Defend the formula softening point (℃) | 102 | ?102 | ?102 | ?102 | ?127 |
| Co60 shines cummulative metering (Mrad) | 30 | ?30 | ?10 | ?20 | ?30 |
| Current measuring element thickness (mm) | 0.13 | ?0.13 | ?0.13 | ?0.13 | ?0.14 |
| R 20(mΩ) | 26 | ?23 | ?23 | ?26 | ?21 |
| R 110(Ω) | 180 | ?150 | ?50 | ?80 | ?0.5 |
| The breaking element surface temperature (℃) | 107 | ?108 | ?128 | ?118 | ?122 |
By the result in the table 1 as can be known, overcurrent protective device is in the resistance (R of high temperature
110) when reacting along with interlinkage the irradiation Co60 cumulative radiation dose increase and increase.And; the above cumulative radiation dose of 20Mrad can meet the characteristic of the desired low temperature of overcurrent protective device (＜110 ℃); in comparative example 3; the formula of the defending softening point of employed polymer is above 110 ℃; can reduce the resistance of overcurrent protective device under 110 ℃ on the contrary, so that lose the effect of low-temperature protection.Indulge the above, the fusing point of the employed polymer of overcurrent protective device of the present invention must need less than 110 ℃ and defend the formula softening point greater than 110 ℃, and the required cumulative radiation dose of interlinkage reaction needs 20Mrad at least.
More than, do an explanation though exemplified preferred embodiment of the present invention, do not deviating under spirit of the present invention and the scope, still can do the change of any equivalence.Therefore, anyly have the knack of conspicuous change of this technical field personage institute or modification, all should comprise within the scope of the claims.
Claims (37)
1, a kind of overcurrent protective device comprises:
One current measuring element for having the conducing composite material of positive temperature coefficient, comprises
At least one polymer; And
One conductive filler, intersperse among this polymer in; And
At least two electrodes fit in the both sides of this current measuring element;
The fusing point that it is characterized in that this polymer is higher than 110 ℃, and the formula softening point of defending is lower than 110 ℃, and the thickness of this current measuring element is between 0.025 millimeter to 0.25 millimeter, and its 20 ℃ of resistance coefficients are no more than 2.0ohm-cm.
2. device as claimed in claim 1, wherein this polymer is a polyolefin polymers.
3. device as claimed in claim 1, wherein this polymer is to be selected from following group: polyethylene, polypropylene and poly-octene.
4. device as claimed in claim 1, wherein this conductive filler is carbon black, metal dust or carbonized ceramic powder.
5. device as claimed in claim 4, wherein this metal dust is nickel powder, silver powder or its mixture.
6. device as claimed in claim 4, wherein this carbonized ceramic powder is titanium carbide or tungsten carbide.
7. device as claimed in claim 1, wherein this conduction composite wood with positive temperature coefficient comprises a non-conducting filler in addition, and intersperses among within this polymer.
8. device as claimed in claim 7, wherein this non-conducting filler is inorganic or organic form.
9. device as claimed in claim 8, wherein this inorganic non-conducting filler is to be selected from: magnesium hydroxide, titanium oxide, calcium carbonate.
10. device as claimed in claim 8, wherein this organic non-conducting filler is to be selected from: the derivative of silicon compounds, acrylic compounds, amine, sulfide, carboxylic acids, fatty acid and ester class and its esters or amorphous polymer.
11. device as claimed in claim 1, wherein this electrode is a sheet metal.
12. device as claimed in claim 11, wherein this sheet metal is the nickel plating Copper Foil;
13. device as claimed in claim 1, wherein this electrode adheres to a metallic conduction sheet with respect to the opposite side of this current measuring element.
14. device as claimed in claim 13, wherein this metallic conduction sheet is the nickel sheet.
15. device as claimed in claim 1, wherein this PTC conducing composite material is through radiation exposure and cummulative metering 20Mrads at least.
16. device as claimed in claim 15, wherein this PTC conducing composite material is to 35Mrads through radiation exposure and cummulative metering 25.
17. device as claimed in claim 1, wherein this PTC conducing composite material infiltrates an additive in addition to strengthen its physical characteristic.
18. device as claimed in claim 17, wherein this additive is a smooth initiator, cross linking agent, coupling agent, dispersant, stabilizer or antioxidant.
19., be to finish with the following step as the device of claim 1:
(a) polymer, a conductive filler and a non-conducting filler are fully mixed to form a PTC conducing composite material;
(b) this PTC conducing composite material and at least two electrodes are carried out pressing, to form a PTC sheet material, wherein, this PTC conducing composite material forms the big current measuring element of a thin slice sheet after pressing;
(c) with this PTC sheet material with radiation exposure, and the irradiation metering of accumulation is at least 20Mrads, makes the PTC conducing composite material produce the interlinkage reaction; And
(d) with this overcurrent protective device of the die-cut formation of this PTC sheet material.
20. device as claimed in claim 19 comprises a step afterwards in addition in step (d), in order to two metallic conduction sheets are adhered to the opposite side of this electrode with respect to this current measuring element.
21. device as claimed in claim 18, wherein the pressing mode of step (b) is to be formed between the mode injecting electrode of extruding with this PTC conducing composite material after the fusion.
22. device as claimed in claim 18, wherein the pressing mode of step (b) is that this PTC conducing composite material and two electrodes are formed with hot pressing.
23. an overcurrent protective device comprises a current measuring element and two electrodes, wherein this current measuring element is formed by a conducing composite material with positive temperature coefficient, and this conducing composite material comprises:
At least one polymer, the fusing point of this polymer are higher than 110 ℃, and the formula softening point of defending is lower than 110 ℃; And
One conductive filler intersperses among within this polymer.
24. material as claimed in claim 23, wherein this polymer is a polyolefin polymers.
25. material as claimed in claim 24, wherein this polymer is to be selected from following group: polyethylene, polypropylene and poly-octene.
26. material as claimed in claim 23, wherein the percentage by weight of this polymer is between 20% to 80%, and the preferably is between 30% to 70%.
27. material as claimed in claim 23, wherein this conductive filler is carbon black, metal dust or carbonized ceramic powder.
28. material as claimed in claim 23, wherein the percentage by weight of this conductive filler is between 20% to 90%, and the preferably is between 30% to 70%.
29. material as claimed in claim 27, wherein this metal dust is nickel powder, silver powder or its mixture.
30. material as claimed in claim 27, wherein this carbonized ceramic powder is titanium carbide or tungsten carbide.
31. material as claimed in claim 23, wherein this conduction composite wood with positive temperature coefficient comprises a non-conducting filler in addition, and intersperses among within this polymer.
32. material as claimed in claim 31, wherein the percentage by weight of this non-conducting filler is between 0.1% to 10%, and the preferably is between 0.5 to 5%.
33. material as claimed in claim 31, wherein this non-conducting filler is inorganic or organic form.
34. material as claimed in claim 33, wherein this inorganic non-conducting filler is to be selected from: magnesium hydroxide, titanium dioxide, calcium carbonate.
35. material as claimed in claim 33, wherein this organic non-conducting filler is to be selected from: the derivative of silicon compounds, acrylic compounds, amine, sulfide, carboxylic acids, fatty acid and ester class and its esters or amorphous polymer.
36. material as claimed in claim 23, wherein this PTC conducing composite material adds an additive in addition to strengthen its physical characteristic.
37. device as claimed in claim 36, wherein this additive is a smooth initiator, cross linking agent, coupling agent, dispersant, stabilizer or antioxidant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01110507 CN1285081C (en) | 2001-04-05 | 2001-04-05 | Over-current protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01110507 CN1285081C (en) | 2001-04-05 | 2001-04-05 | Over-current protector |
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| Publication Number | Publication Date |
|---|---|
| CN1378217A true CN1378217A (en) | 2002-11-06 |
| CN1285081C CN1285081C (en) | 2006-11-15 |
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ID=4658638
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01110507 Expired - Fee Related CN1285081C (en) | 2001-04-05 | 2001-04-05 | Over-current protector |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112310936A (en) * | 2019-07-26 | 2021-02-02 | 富致科技股份有限公司 | Overcurrent protection device |
| CN113826174A (en) * | 2018-11-23 | 2021-12-21 | 上海利韬电子有限公司 | PPTC compositions and devices with low thermal deration and low process jump |
| CN114552537A (en) * | 2022-02-28 | 2022-05-27 | 青岛黄海学院 | Automobile storage battery protection device and protection method thereof |
-
2001
- 2001-04-05 CN CN 01110507 patent/CN1285081C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113826174A (en) * | 2018-11-23 | 2021-12-21 | 上海利韬电子有限公司 | PPTC compositions and devices with low thermal deration and low process jump |
| US11881337B2 (en) | 2018-11-23 | 2024-01-23 | Littelfuse Electronics (Shanghai) Co., Ltd. | PPTC composition and device having low thermal derating and low process jump |
| CN112310936A (en) * | 2019-07-26 | 2021-02-02 | 富致科技股份有限公司 | Overcurrent protection device |
| CN114552537A (en) * | 2022-02-28 | 2022-05-27 | 青岛黄海学院 | Automobile storage battery protection device and protection method thereof |
| CN114552537B (en) * | 2022-02-28 | 2023-09-05 | 青岛黄海学院 | Automobile storage battery protection device and protection method thereof |
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| Publication number | Publication date |
|---|---|
| CN1285081C (en) | 2006-11-15 |
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