CN1501421A - Alloy type temperature fuse and method for manufacturing the same - Google Patents
Alloy type temperature fuse and method for manufacturing the same Download PDFInfo
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- CN1501421A CN1501421A CNA021519900A CN02151990A CN1501421A CN 1501421 A CN1501421 A CN 1501421A CN A021519900 A CNA021519900 A CN A021519900A CN 02151990 A CN02151990 A CN 02151990A CN 1501421 A CN1501421 A CN 1501421A
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Abstract
The invention relates to a safety fuse which comprises plastic bottom film, metal electrode connection sheets, fusible alloy fuse and plastic upper film, the alloy type temperature fuse responds quickly to temperature change, it can be used for small-sized electron devices such as cell phone lithium battery. The invention also discloses the process for making the safety fuse having simple production technology.
Description
Technical field
The present invention relates to a kind of fuse and manufacture method thereof, this fuse is mainly used in the lithium ion battery of mobile phone piece, when battery of mobile phone be in abnormal state as overcharge, during occasion such as overcurrent, this fuse automatic disconnection sets off an explosion, catches fire etc. in case battery temperature is too high.
Background technology
In recent years, along with the development of mechanics of communication, small portable electronic device such as mobile phone, laptop computer, PDA etc. are universal day by day.And lithium ion battery is because it has the supply power that series of advantages becomes above mini-plant gradually.If but the lithium ion battery improper use, as overcharging or charging current when excessive, battery temperature sharply raises, and danger such as might set off an explosion, catch fire.For this reason, generally adopt and in battery block, use all temps safeties to control temperature, as PTC thermistor and low-melting alloy fuse etc.
The PTC thermistor has important application in overcurrent protection.Composite oxide of metal ceramic base PTC thermistor and polymer matrix PTC thermistor are generally arranged.When electric current was excessive in the circuit, temperature raise, and the thermistor resistance sharply raises, thereby cut off electric current, and after temperature reduced, its resistance returned to very low state again, so the PTC thermistor can use repeatedly.
But no matter be composite oxide of metal ceramic base PTC thermistor or polymer matrix PTC thermistor, its manufacturing process is all very complicated, requires bigger to equipment investment.As to the polymer matrix PTC thermistor, need plastics compounding equipment, cross-linking modified equipment etc.; And, then needing powder equipment, agglomerating plant etc. to composite oxide of metal ceramic base PTC thermistor, it requires to be close to harsh to impurity content.And all there is the problem in useful life in the PTC thermistor, promptly use a period of time after, be prone to NTC phenomenon (descending) with the resistance of temperature rising thermistor, when producing the NTC phenomenon, be quite dangerous to the use of lithium battery.
Low-melting alloy type fuse is to adopt fusible alloy as the fuse action cell, because the fusible alloy composition is fixed, near the temperature range that undergoes phase transition its fusing point is very narrow, when the fusing point of the too high arrival fusible alloy of temperature in the battery, the fusing of the fuse velocity of sound disconnects, so this fuse has, and response is rapid, sensitive characteristics.
Chinese patent 00246178.1 discloses a kind of thin temperature fuse that is mainly used in the lithium secondary battery, this fuse is made up of guide card, fuse assembly and protective sheet, two guide cards are in line side by side, separate with a determining deviation, between two guide cards, be connected with a fuse assembly, two guide cards connect into linearity, closed state is all combined closely into mutually by two resin protective sheets in guide card and fuse assembly two sides, wherein the operating temperature of low-melting alloy fuse is between 90-110 ℃, is to be connected by gummed method or hot melt between fuse assembly and the guide card.But this patent does not relate to the concrete manufacture method of this kind thin temperature fuse, the not openly composition of each building block of fuse and parameter etc. yet.
Bridge company discloses a kind of thin temperature fuse in the Japan in Japan Patent P2000-113784 and USP5982268, wherein two rectangle nickel electrode braces, one end respectively has a hat projection, with brace and the welding of plastics counterdie, make this projection pass circular port on the plastics counterdie, be exposed to the counterdie surface, in welding between two projections, scribble the wire low-melting alloy silk of scaling powder then, again a plastic film and the plastics counterdie with groove welded, the alloy silk is among the encirclement of counterdie and last film.The Thermal Cutoffs that adopts this method to make; plastics up and down between the film in conjunction with closely; help protecting inner low-melting alloy silk; but being connected for foreign material between metal electrode brace and the plastics counterdie; the performance of its anti-vertical shear is bad; and higher to welding process requirement between low-melting alloy silk and the conoid protuberance, be unfavorable for operation.In addition,, need higher temperature during welding, so hot-press arrangement need adopt the water-cooling system of minimal type, increase the difficulty of Equipment Control, increase energy consumption owing to adopted the higher PET film of fusing point as plastics film up and down.
Matsushita Electric Industrial Company, Ltd. discloses a kind of similar thin temperature fuse and manufacture method thereof in Japan Patent P2000-164093, wherein electrode connecting piece one end leaving certain gaps uncovered by the economic plan, one end of this brace leaving certain gaps uncovered by the economic plan is welded on the plastics counterdie, then banded low-melting alloy wire bond is received two ends that electrode connecting piece is relative.Be the fixed electrode brace, this is invented into a rectangular ring plastic film (intermediate layer) and plastics counterdie and electrode connecting piece welding, and the electrode connecting piece gap portions is covered by this intermediate layer, and then film on the welding plastic thereon.Make electrode connecting piece fixing between the film about plastics owing to adopted electrode connecting piece and the intermediate layer that has breach, this method to help, anti-vertical shear intensity improves.But owing to adopted the intermediate layer, increased operational sequence, and it is still not high to reach on intermediate layer and the plastics between the film bond strength between metal electrode brace and the plastics counterdie.In addition, because adopt the high-intensity PET class of high-melting-point material as film about the plastics, therefore the welding between the film needs higher temperature, heat conducting influence when the alloy silk that fusing point is lower is vulnerable to weld up and down, rate of finished products is reduced, also very high to the requirement of operating means.
Content of the present invention
The invention provides a kind of alloy-type temperature fuse, mainly form, specify as follows by several parts of film on plastics counterdie, metal electrode brace, fusible alloy fuse and the plastics:
Film on plastics counterdie and the plastics: the material of employing has high mechanical strength and high fusing point, uses as matrix, is called first plastic layer; The all compound again material layer of nexine constitutes the two-layer compound plastic film, this material layer have lower fusing point and and metals such as nickel, copper between high adhesive property is arranged, be called second plastic layer.Wherein form first plastic layer, thickness 80-150 micron by engineering plastics such as PET, PBT, PC, ABS, PS.Single above-mentioned engineering plastics have high mechanical strength, but the bonding force of itself and metal is not fine, and above-mentioned material generally has high fusing point, be unfavorable for sweat soldering, by compound one deck have lower fusing point and and metal such as nickel, copper between form second plastic layer by the material of high adhesive property, make composite membrane have high mechanical strength and adhesive strength simultaneously, and be beneficial to the sweat soldering operation.This composite membrane preferred example can list as PET/PE, PC/EVA, ABS/PE, PET/ABS etc., preferred example such as PET/PE, and wherein PE is a modified poly ethylene, usually with acrylic acid or maleic anhydride modified.
The fusible alloy fuse: the metal or alloy that is formed by at least a above element in indium, tin, silver, cadmium, lead, bismuth, antimony, the copper constitutes.Difference according to alloy silk constituent, its resistivity is also different, therefore its sectional area has different requirements, the alloy silk is band shape or sheet usually, rounded or the rectangle in cross section, preferred example can enumerate as: form Bi-Sn-Pb ternary eutectic alloy by 52.5wt%, 15.5wt%, 32wt%, or form the In-Sn-Cd-Bi quaternary alloy by 44wt%, 42wt%, 13wt%, 1wt% by bismuth (Bi), tin (Sn), plumbous (Pb) by indium (In), tin (Sn), cadmium (Cd), bismuth (Bi).
Electrode connecting piece: by nickel or copper or aluminium, or the formed alloy of above-mentioned element constitutes.One end of electrode connecting piece is at least a or more than one formations in copper, tin, indium, lead, bismuth, silver, the antimony with surface, the bonding place of second plastic layer of plastics counterdie promptly, can improve the welding performance of electrode connecting piece and low-melting alloy silk.Becoming the arc or the waist v notch v of symmetry to help improving fastness with the bonding Position Design of plastics counterdie electrode connecting piece.Adapt to the slimming requirement, electrode connecting piece thickness is that 60-150 μ m is good.
The invention provides a kind of method of making alloy type temperature fuse of as above-mentioned description, comprise by following steps:
The arrangement that is in line relatively of pair of metal electrodes brace top, both ends are separated by a certain interval, and an end and plastics counterdie that two braces are relative are bonded together;
Between two braces, burn-on and be added with the fuse of scaling powder;
Film on the plastic covering thereon, and be bonded together around the film under film on the plastics and electrode connecting piece and the plastics, fuse is surrounded by the closed system of being made up of the upper and lower film of plastics.
Wherein electrode connecting piece fixedly is by hot pressing or adopt the bonding or alternate manner of glue to be bonded on second plastic layer of plastics counterdie with an end of electrode connecting piece, the bonding electrode connecting piece surface that goes out forms with plating, brushing or alternate manner that at least a above metal or alloy layer is good in copper, tin, indium, lead, bismuth, silver, antimony, nickel, the aluminium, to improve the welding performance of electrode connecting piece and low-melting alloy silk.
The connection of fusible alloy silk can be connected the relative end of two electrode connecting piece by hot weld, electric resistance welding or hot pressing or other method with the alloy silk by in low-melting alloy silk surface and electrode connecting piece one end coating flux solvent or after adding flux powder.Scaling powder is made of the rosin based material, it can be dissolved in ethanol etc. and make the brushing of solution shape, can also be with Powdered coating.Because natural rosin has more two keys, its non-oxidizability is relatively poor, therefore adopts the main component as scaling powder such as Foral, newtrex, disproportionated rosin.
Become the system of a sealing by bonding film, electrode connecting piece, fusible alloy fuse and plastics counterdie on the plastics are bonded together by second plastic layer of hot pressing, ultrasonic bonding or glue.
The invention provides a kind of alloy-type temperature fuse and can be used for miniaturized electronicss such as cellular li-ion battery, rapidly the variations in temperature response; The invention provides the method for making alloy type temperature fuse of above-mentioned feature, manufacture craft is simple, invests little.
Description of drawings
Fig. 1 electrode connecting piece schematic diagram of the present invention.
Electrode connecting piece that Fig. 2 is shown in Figure 1 and the bonding schematic diagram of plastics counterdie.
Fig. 3 connects the alloy-type temperature fuse schematic diagram on shown in Figure 2.
Fig. 4 adds the scaling powder schematic diagram on shown in Figure 3.
Fig. 5 shown in Figure 4 bonding with plastics on film obtain alloy-type temperature fuse schematic diagram of the present invention.
Embodiment
As Fig. 1 to alloy-type temperature fuse organigram of the present invention shown in Figure 5, wherein
The metal electrode brace is the metallic nickel sheet, and design has the waist v notch v, and the end is coated with the copper layer, electrode connecting piece thickness 120 μ m, planar dimension 3mm * 12mm, the end 3.5mm that breach centre-to-centre spacing is nearer, notch length 2mm, the minimum widith of gap portions brace are 2mm-2.6mm;
Film is a base material with poly terephthalic acid ethylene ester (PET) all on plastics counterdie and the plastics, compound thereon one deck modified poly ethylene layer (PE), has high adhesive strength between this modified poly ethylene layer and the metal, first plastic layer (basement membrane) thickness, the 150 μ m of plastics counterdie wherein, second plastic layer, 50 μ m, planar dimension 5.5mm * 11mm, film first plastic layer (basement membrane) thickness 120 μ m on the plastics, second plastic layer, 30 μ m, planar dimension 5.5 * 11mm;
The fusible alloy silk can be formed Bi-Sn-Pb ternary eutectic alloy by 52.5wt%, 15.5wt%, 32wt% by bismuth (Bi), tin (Sn), plumbous (Pb), and 96 ℃ of eutectic temperatures, alloy silk are sheet, the about 0.2mm of thickness, the about 0.5～0.6mm of sectional area
2, resistance is～15m Ω, is numbered 1 in test experiments;
The fusible alloy silk can also be formed the In-Sn-Cd-Bi quaternary alloy by 44wt%, 42wt%, 13wt%, 1wt% by indium (In), tin (Sn), cadmium (Cd), bismuth (Bi), and 93 ℃ of eutectic temperatures, alloy silk are wire, the about 0.3mm of sectional area
2, resistance～11m Ω is numbered 2 in test experiments.
Scaling powder is main active component with Foral.
It is as follows that the present invention is described in more detail in conjunction with the accompanying drawings again:
As shown in Figure 2, the above temperature of fusing point of second plastic layer by electrode connecting piece being heated to plastics counterdie composite membrane, metal electrode brace with a pair of waist v notch v as shown in Figure 1, end near breach is placed in opposite directions and is welded on the one side of plastics counterdie composite membrane, and barbed portion is welded on the plastics counterdie fully;
As shown in Figure 3, the low-melting alloy silk is welded to the end of above-mentioned metal connecting sheet near an end of breach by means such as electric resistance welding, hot weld or Laser Welding;
As shown in Figure 4, reach the positions such as junction of low-melting alloy silk and electrode connecting piece on the low-melting alloy silk, add the molten scaling powder by the micro liquid injection device, this scaling powder fusing point is lower than the fusing point of low-melting alloy silk;
As shown in Figure 5, film on the plastics is bonded together by hot pressing mode and plastics counterdie and metal connecting sheet indentation, there, hot pressing temperature obtains Thermal Cutoffs of the present invention a little more than the fusing point of second plastic layer of composite membrane.Because the fusing point of composite membrane is more much lower than the fusing point of plastic-based film PET, it is temperature required to reduce hot pressing, so as not to the low-melting alloy silk when being subjected to hot pressing heat effects and melt.
Owing to adopted composite membrane as plastics film up and down, improved plastics up and down between the film, the plastics adhesive strength between film and the metal electrode brace up and down, make the shear strength raising of Thermal Cutoffs; Reduce hot pressing temperature simultaneously, simplified the complexity of equipment and operation, need not water-cooling system simultaneously, reduced energy loss.
1 and 2 the fuse of being made by the above low-melting alloy silk enumerated of being numbered is carried out performance test:
1, fusing-off temperature test
Fuse series connection access is had in the loop of load, and the direct current by 0.1A in circuit detects.Sample places silicone oil bath, heats up with 1 ℃/min speed, and up to its disconnection, no current passes through in the circuit, and record oil bath temperature at this moment is the fusing-off temperature of fuse.
Measure 20 samples altogether, ask its mean value, result such as table 1:
Table 1
2, out of circuit test
Table 2
Claims (17)
1, a kind of alloy-type temperature fuse, comprise film on plastics counterdie, metal electrode brace, fusible alloy fuse and the plastics, it is characterized in that: all compound again material layer of the nexine of film constitutes the two-layer compound plastic film on plastics counterdie and the plastics, wherein the material that film adopted on plastics counterdie, the plastics has high mechanical strength and high fusing point, use as matrix, be called first plastic layer; Have lower fusing point and and metal such as nickel, copper between the material layer of high adhesive property is arranged, be called second plastic layer.
2, alloy-type temperature fuse according to claim 1, wherein on plastics counterdie, the plastics composite bed of film by PET/PE, PC/EVA, ABS/PE, PET/ABS are compound makes.
3, alloy-type temperature fuse according to claim 2, wherein the film composite bed is made by PET/PE on plastics counterdie, the plastics, and wherein PE is a modified poly ethylene.
4, according to claim 1,2 or 3 described alloy-type temperature fuses, wherein first plastic layer of film is the 80-200 micron on plastics counterdie, the plastics.
5, alloy-type temperature fuse according to claim 1, wherein fuse is made of the metal or alloy that at least a above element in indium, tin, silver, cadmium, lead, bismuth, antimony, the copper forms.
6, alloy-type temperature fuse according to claim 5, wherein fuse is formed Bi-Sn-Pb ternary alloy three-partalloy formation by bismuth (Bi), tin (Sn), plumbous (Pb) by 52.5wt%, 15.5wt%, 32wt%.
7, alloy-type temperature fuse according to claim 5, wherein fuse is formed In-Sn-Cd-Bi quaternary alloy formation by indium (In), tin (Sn), cadmium (Cd), bismuth (Bi) by 44wt%, 42wt%, 13wt%, 1wt%.
8, alloy-type temperature fuse according to claim 1, wherein electrode connecting piece is by nickel or copper or aluminium, or the formed alloy of above-mentioned element constitutes.
9, alloy-type temperature fuse according to claim 8, wherein electrode connecting piece thickness is the 60-150 micron.
10, according to Claim 8 or 9 described alloy-type temperature fuses, wherein surface, the bonding place of an end of electrode connecting piece and plastics counterdie is additional at least a or more than one metal or alloy layers in copper, tin, indium, lead, bismuth, silver, the antimony.
11, according to Claim 8 or 9 described alloy-type temperature fuses, wherein electrode connecting piece is having the arc or the waist v notch v of symmetry with the bonding position of plastics counterdie.
12, as the described method of making alloy type temperature fuse of claim 1 to 11, comprise the steps:
The arrangement that is in line relatively of pair of metal electrodes brace top, both ends are separated by a certain interval, and an end and plastics counterdie that two braces are relative are bonded together;
Between two braces, burn-on and be added with the fuse of scaling powder;
Film on the plastic covering thereon, and be bonded together around the film under film on the plastics and electrode connecting piece and the plastics, fuse is surrounded by the closed system of being made up of the upper and lower film of plastics.
13, method of making alloy type temperature fuse according to claim 12 is bonding by hot pressing or glue between electrode connecting piece and the plastics counterdie wherein.
14, method of making alloy type temperature fuse according to claim 12, wherein fuse is to be connected two electrode connecting piece by electric resistance welding, hot weld, ultrasonic bonding or Laser Welding.
15, method of making alloy type temperature fuse according to claim 12, wherein scaling powder is by in fuse surface coated flux solvent or add the scaling powder pressed powder thereon and add.
16, alloy-type temperature fuse according to claim 15, wherein scaling powder is made of the rosin based material.
17, method of making alloy type temperature fuse according to claim 12 is together bonding by hot pressing, ultrasonic bonding or glue between film and plastics counterdie and the electrode connecting piece on the plastics wherein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02151990 CN1278353C (en) | 2002-11-19 | 2002-11-19 | Alloy type temperature fuse and method for manufacturing the same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02151990 CN1278353C (en) | 2002-11-19 | 2002-11-19 | Alloy type temperature fuse and method for manufacturing the same |
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| Publication Number | Publication Date |
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| CN1501421A true CN1501421A (en) | 2004-06-02 |
| CN1278353C CN1278353C (en) | 2006-10-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 02151990 Expired - Lifetime CN1278353C (en) | 2002-11-19 | 2002-11-19 | Alloy type temperature fuse and method for manufacturing the same |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100369297C (en) * | 2004-11-19 | 2008-02-13 | 比亚迪股份有限公司 | Alloy-style temperature fuse |
| CN100428555C (en) * | 2005-03-24 | 2008-10-22 | 三星Sdi株式会社 | Rechargeable battery |
| CN102496536A (en) * | 2011-12-27 | 2012-06-13 | 东莞市贝特电子科技有限公司 | Explosion-proof fuse and method for manufacturing same |
| CN103956590A (en) * | 2014-05-15 | 2014-07-30 | 浙江启星电气科技有限公司 | Conducting rod |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101393823B (en) * | 2007-09-21 | 2010-12-22 | 比亚迪股份有限公司 | Alloy type temperature fuse and manufacturing method thereof |
-
2002
- 2002-11-19 CN CN 02151990 patent/CN1278353C/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100369297C (en) * | 2004-11-19 | 2008-02-13 | 比亚迪股份有限公司 | Alloy-style temperature fuse |
| CN100428555C (en) * | 2005-03-24 | 2008-10-22 | 三星Sdi株式会社 | Rechargeable battery |
| CN102496536A (en) * | 2011-12-27 | 2012-06-13 | 东莞市贝特电子科技有限公司 | Explosion-proof fuse and method for manufacturing same |
| CN103956590A (en) * | 2014-05-15 | 2014-07-30 | 浙江启星电气科技有限公司 | Conducting rod |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1278353C (en) | 2006-10-04 |
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Granted publication date: 20061004 |