WO2004031426A1 - 温度ヒューズ用素子、温度ヒューズおよびそれを用いた電池 - Google Patents
温度ヒューズ用素子、温度ヒューズおよびそれを用いた電池 Download PDFInfo
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- WO2004031426A1 WO2004031426A1 PCT/JP2003/012769 JP0312769W WO2004031426A1 WO 2004031426 A1 WO2004031426 A1 WO 2004031426A1 JP 0312769 W JP0312769 W JP 0312769W WO 2004031426 A1 WO2004031426 A1 WO 2004031426A1
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- thermal fuse
- weight
- insulating film
- fusible alloy
- alloy
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/74—Switches in which only the opening movement or only the closing movement of a contact is effected by heating or cooling
- H01H37/76—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material
- H01H37/761—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material with a fusible element forming part of the switched circuit
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/02—Details
- H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C28/00—Alloys based on a metal not provided for in groups C22C5/00 - C22C27/00
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
- C22C30/04—Alloys containing less than 50% by weight of each constituent containing tin or lead
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/74—Switches in which only the opening movement or only the closing movement of a contact is effected by heating or cooling
- H01H37/76—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/574—Devices or arrangements for the interruption of current
- H01M50/581—Devices or arrangements for the interruption of current in response to temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/574—Devices or arrangements for the interruption of current
- H01M50/583—Devices or arrangements for the interruption of current in response to current, e.g. fuses
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H2009/0077—Details of switching devices, not covered by groups H01H1/00 - H01H7/00 using recyclable materials, e.g. for easier recycling or minimising the packing material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/02—Details
- H01H37/32—Thermally-sensitive members
- H01H37/52—Thermally-sensitive members actuated due to deflection of bimetallic element
- H01H2037/526—Materials for bimetals
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/74—Switches in which only the opening movement or only the closing movement of a contact is effected by heating or cooling
- H01H37/76—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material
- H01H2037/768—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material characterised by the composition of the fusible material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2200/00—Safety devices for primary or secondary batteries
- H01M2200/10—Temperature sensitive devices
- H01M2200/103—Fuse
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the present invention relates to a thermal fuse element, a thermal fuse provided with the element, and a battery using the thermal fuse.
- Pb-free solder is used in the protection circuit that connects the battery to the temperature fuse by spot welding and controls the charging and discharging of the battery.
- thermal fuses that do not contain Pb and Cd.
- FIG. 7 is a sectional view of a conventional thermal fuse.
- a conventional thermal fuse comprises a cylindrical insulating case 1 having openings at both ends, a substantially cylindrical or substantially prismatic fusible alloy 2 disposed in the insulating case 1, and a pair of lead conductors. 3, a flux (not shown) applied to the fusible alloy 2, and a sealing body 4 for sealing the openings at both ends of the insulating case 1.
- One end of each of the pair of lead conductors 3 is connected to both ends of the fusible alloy 2, and the other end is led out of the insulating case 1 through the opening of the insulating case 1.
- the thermal fuse that blows at 5 to 95 ° C uses Sn—Cd—In eutectic alloy (melting point 93 ° C) and SnBi—Pb eutectic alloy (melting point 95) as the fusible alloy 2.
- a thermal fuse provided with a fusible alloy containing Pb or Cd is disclosed in JP-A-2000-90792.
- the fusible element used in the thermal fuse is 20% by weight or more and 39.5% by weight or less of Sn, 11.5% by weight or more and 31% by weight or less of Bi, and 49% by weight or more and 68.5% by weight or less of In. It consists of an alloy containing.
- FIG. 1A is a top view of the thermal fuse according to Embodiment 1 of the present invention.
- FIG. 1B is a cross-sectional view of the thermal fuse of Embodiment 1 shown in FIG. 1A, taken along line 1B_1B.
- FIG. 1C is an enlarged sectional view of the thermal fuse in the first embodiment.
- FIG. 2 shows the composition of Sn—Bi-In ternary alloy constituting the fusible alloy of the thermal fuse according to the first embodiment.
- FIG. 3A is a top view of a thermal fuse according to Embodiment 2 of the present invention.
- FIG. 3B is a cross-sectional view of the thermal fuse of Embodiment 2 shown in FIG. 3A, taken along line 3B_3B.
- FIG. 4 is a perspective view of a battery according to Embodiment 3 of the present invention.
- FIG. 5 is a sectional view of a radial thermal fuse according to Embodiment 4 of the present invention.
- FIG. 6 is a sectional view of an axial-type thermal fuse according to Embodiment 5 of the present invention.
- FIG. 7 is a sectional view of a conventional temperature fuse.
- FIG. 1A is a top view of the thin thermal fuse according to Embodiment 1 of the present invention.
- FIG. 1B is a cross-sectional view taken along line 1B-1B of the thermal fuse shown in FIG. 1A.
- a pair of metal terminals 12 that are narrower than the first insulating film 11 are attached to the first insulating film 11 of the single-layer sheet.
- the fusible alloy 13 constitutes a fusible element for a thermal fuse that is located above the first insulating film 11 and is connected between the tip portions of the pair of metal terminals 12.
- a flux (not shown) composed of a resin whose main component is rosin is applied around the fusible alloy 13.
- the second insulating film 14 of the single-layer sheet is located above the fusible alloy 13 and is attached by sealing to the first insulating film 11 so as to form a space between the second insulating film 13 and the first insulating film 11. It is.
- the insulating films 11 and 14 form an insulating storage body that stores the soluble alloy 13.
- the metal terminal 12 is in the shape of a strip or a wire, and is made of a nickel metal or a nickel alloy such as copper nickel, a nickel single substance or a nickel alloy to which other elements are added. Since the metal terminal 12 containing nickel 98% or more electrical resistivity 6. 8X 10- 8 ⁇ 12 X 10_ 8 ⁇ ⁇ m and less can dramatically improve the reliability of such corrosion.
- the thickness of the metal terminal 12 itself is 0.15 mm or less. When the thickness exceeds 0.15 mm, the thermal fuse becomes thicker.
- Young's modulus is 3 X 1 0 10 ⁇ 8X 10 10 P a
- the metal terminals 12 tensile strength is due to the material is 4 X 10 8 ⁇ 6X 10 8 P a is not bent accidentally during handling or transportation, and It can be bent easily, and there is no break in bending. If the Young's modulus of the metal terminal 12 is 3 ⁇ 10 1 QPa or less, it is easily bent, so the part that should not be bent (For example, the electrical connection portion at the end of the metal terminal 12) tends to be uneven. As a result, electrical connection by welding with the fusible alloy 13 becomes difficult.
- the metal terminal 12 is hard to bend or breaks and breaks. Further, when the tensile strength of the metal terminal 12 is less than 4X 1Q 8 P a, bend easily, the tensile strength is at 6 X 10 8 P a higher bending difficult, or broken by disconnection.
- the metal terminal 12 may include a metal layer 12 A made of Sn, Cu, or the like having good wettability with respect to the fusible alloy 13 on the upper surface of the tip portion. A and the fusible alloy 13 are connected. Since the wettability of Sn and Cu forming the metal layer 12 A with respect to the soluble alloy 13 is better than the wettability of nickel forming the metal terminal 12, the fusible alloy 13 after the melting is applied to the metal layer 12 A. The movement is promoted, and as a result, the fusible alloy 13 is quickly separated.
- the metal layer 12A As a material of the metal layer 12A, a single metal of Cu, Sn, Bi, or In or an alloy thereof is used.
- the thickness of the metal layer 12A is preferably 15 or less. If the thickness is 15 m or more, the amount of metal that forms the metal layer 12A diffuses into the fusible alloy 13, so that the melting point of the fusible alloy 13 fluctuates and the fusing temperature of the thermal fuse varies. . If an alloy having the same composition as the fusible alloy 13 is used as the material of the metal layer 12A, even if the metal constituting the metal layer 12A diffuses into the fusible alloy 13, the amount of diffusion is small, The melting point of alloy 13 does not change.
- the fusible alloy 13 is composed of an Sn_Bi-In alloy, with Sn being 20% by weight or more and 39.5% by weight or less, In being 49% by weight or more and 68.5% by weight or less, and Bi being 11.1% by weight or less. Contains 5% by weight or more and 31% by weight. As a result, a thermal fuse containing no Pb or Cd and having a fusing temperature of 95 ° C or less can be provided.
- the Sn—Bi-In alloy that constitutes the fusible alloy 13 if the compounding ratio of Sn is less than 20% by weight, In is softer than Sn and Bi is more brittle than Sn. However, the strength of the fusible alloy 13 becomes insufficient, and as a result, handling in the manufacturing process becomes difficult.
- the Sn—Bi-I In the n alloy when the compounding ratio of In is less than 49% by weight, the state of Sn is excessive, and when the compounding ratio of In is more than 55% by weight, the state of In is excessive.
- the melting point of Sn alone is 232 ° C, which is higher than the melting point of In alone, 1.56 ° C.
- the melting point of the fusible alloy 13 with an excessive amount of Sn strongly depends on the compounding ratio of Sn, the variation of the melting point due to the fluctuation of the mixing ratio increases, and the fluctuation of the fusing temperature of the thermal fuse increases.
- the compounding ratio of In needs to be 49% by weight or more, and preferably 49 to 55% by weight with a good balance between Sn and In.
- the melting point of the fusible alloy 13 exceeds 95 when B i is 11.5% by weight or less. .
- Fig. 2 shows the composition of the Sn-Bi-Inn ternary alloy constituting the fusible alloy 13.
- the above-mentioned composition of the fusible alloy 13 corresponds to the region surrounded by the line 15 in FIG. 2, and the composition ratio of In is particularly preferably 49 to 55% by weight ′, which is the hatched region 16.
- the fusible alloy 13 is processed into a linear shape by die drawing or die extrusion with a circular cross section. Then, the linear alloy 13 is crushed and processed into a linear shape having a rectangular or elliptical cross section and a thickness of 0.1 mm or less. This is then cut to the appropriate length and made.
- the fusible alloy 13 is provided between the tips of the pair of metal terminals 12 at the center of the upper surface of the first insulating film 11.
- the metal terminal 12 and the fusible alloy 13 are connected using laser welding, heat welding, ultrasonic welding, or the like. In the laser welding, the heat-generating portion can be reduced, so that the fusible alloy 13 can be connected to the metal terminal 12 without damaging the portion other than the portion to be welded.
- the first insulating film 11 and the second insulating film 14 have a thickness of 0.15mnL3 ⁇ 4 or less. If the thickness exceeds 0.15 mm, the thermal fuse becomes thick and unsuitable for thin thermal fuses.
- the first insulating film 11 and the second insulating film 14 are made of, for example, polyethylene terephthalate (PET), polyethylene naphthate (PEN), ABS resin, SAN resin, polysulfone resin, Resin containing any of Bonate resin, Noryl, Pierre chloride resin, Polyethylene resin, Polyester resin, Polypropylene resin, Polyamide resin, PPS resin, Polyacetal, Fluorine resin and Polyester, preferably thermoplastic resin Consisting of
- the first insulating film 11 and the second insulating film 14 have a single layer, but may be formed of a plurality of stacked sheets of different materials.
- the first insulating film 11 and the second insulating film 14 in which a PET film and a PEN film are laminated have high strength. Thereby, the mechanical strength of the temperature fuse can be improved.
- the first insulating film 11 and the second insulating film 14 made of a film laminated together may be manufactured by combining a material having low heat resistance and a material having high heat resistance in addition to the combination of the above materials.
- Embodiment 1 as shown in FIGS.
- the length L a of the main body of the thermal fuse composed of the first insulating film 11., the second insulating film 14, and the fusible alloy 13 is 2.0 mm.
- the length La is more than 5.0 mm, the area required for installation is large, so it is not practical as a temperature fuse for small batteries. Therefore, the length L a of the thermal fuse body is preferably in the range of 2.0 to 5.0 mm.
- the space for accommodating the fusible alloy 13 is not sufficient. It is difficult to make a temperature fuse because it cannot be secured.
- Lb is 0.7 mm or more, the thermal fuse becomes thick.
- this thermal fuse is installed on a small battery, such as an electrode, having a protrusion with a height of about 0.5 to 0.7 mm, the connection between the thermal fuse and the battery becomes large, and this is not practical. Absent.
- the thickness Lb from the lower surface of the first insulating film 11 to the upper surface of the second insulating film 14 is preferably in the range of 0.3 to 0.7 mm.
- the fusible alloy 13 an alloy having a composition of Sn 37%, Bil 2%, and In 51% was formed into a line having a circular cross section of 0.5 mm in diameter by die drawing, and then crushed. It was processed to form a line with a rectangular cross section of 0.1 mm in thickness and 1.95 mm in width, and then cut to 3 mm in length.
- PET films having a length of 5 mm, a width of 3 mm, and a thickness of 0.1 mm were used.
- the metal terminal 12 was formed by applying a 1 Om thick Sn plating layer 12A to the tip of a nickel plate having a length of 10 mm, a width of 3 mm, and a thickness of 0.1 mm.
- the flux (not shown) mainly used rosin.
- the fusible alloy 13 As the fusible alloy 13, an alloy having a composition of 32% Sn, 8% Bil, and 50% In was used. The same first insulating film 11, metal terminal 12, second insulating film 14, and flux as in Example 1 were used.
- the fusible alloy 13 an alloy having a composition of 40% of Sn, 5% of Bil, and 45% of In was used.
- the same first insulating film 11, metal terminal 12, second insulating film 14, and flux as in Example 1 were used.
- the fusible alloy 13 As the fusible alloy 13, an alloy having a composition of 42% of Sn, 8% of Bi, and 50% of In was used. The first insulating film 11, the metal terminals 12, the second insulating film 14, and the same flux as in Example 1 were prepared. Using the fusible alloy 13 of Example 1, Example 2, Comparative Example 1, and Comparative Example 2, 20 thermal fuses according to Embodiment 1 were produced. The thickness of the thermal fuse is 0.55-0.70mm and very thin. The created thermal fuse was put into an air oven whose temperature rises at 1 ° C / min, and the temperature at which this thermal fuse melted was measured.
- Table 1 shows the measurement results of the fusing temperatures of the thermal fuses of Example 1, Example 2, Comparative Example 1, and Comparative Example 2.
- the fusible alloy 13 is made of a Sn—Bi—In alloy, but unavoidable impurities such as Zn, Ag, and Cu may be mixed in this alloy. . If impurities that are unavoidable are mixed in at 0.5% by weight or more, the fusing temperature may vary. Therefore, it is desirable that the amount of impurities be 0.5% by weight or less.
- FIG. 3A is a top view of the thin thermal fuse according to Embodiment 2 of the present invention.
- Figure 3B is a cross-sectional view of the thermal fuse shown in FIG. 3A, taken along line 3B-3B.
- the thermal fuse of the second embodiment shown in FIGS. 3A and 3B has the same components as the thermal fuse of the first embodiment shown in FIGS. 1A and IB.
- the thermal fuse according to the second embodiment differs from the first embodiment in that a part of each end of the pair of metal terminals 112 is exposed from the lower surface of the first insulating film 111 to the upper surface as shown in FIG. 3B. ing.
- the other components are the same as the components of the thermal fuse in the first embodiment.
- the fusible element constituting the fusible element for thermal fuse connected above the first insulating film 111 and connected between the distal ends of the pair of metal terminals 112 is also provided.
- Alloy 113 is composed of a Sn—Bi—In alloy containing at least 20% by weight of Sn, at least 11.5% by weight of Bi, and at least 49% by weight of In. Therefore, Pb and Cd are not contained in the fusible alloy 113, and as a result,? 13 ⁇ 01 is not eluted.
- the length Lc of the main body of the thermal fuse composed of the first insulating film 111, the second insulating film 114, and the fusible alloy 113 is less than 2.0 mm.
- the insulation distance between the pair of metal terminals 112 after fusing the thermal fuse may not be sufficiently secured due to projections such as burrs generated when the metal terminal 112 is manufactured, which is not practical as a thermal fuse.
- the length Lc of the thermal fuse body is preferably in the range of 2.0 to 5.0 mm.
- the thickness L d from the lower surface of the first insulating film 111 to the upper surface of the second insulating film 114 shown in FIG. 3B is 0.3 mm or less, the space for accommodating the fusible alloy 113 is provided. Therefore, it is difficult to make a thermal fuse. If the length Ld is 0.7 mm or more, the thermal fuse becomes thick. For example, if this thermal fuse is installed on a small battery, such as an electrode, having a protrusion with a height of about 0.5 to 0.7 mm, the connection between the thermal fuse and the battery becomes large and is not practical. No. Therefore, the thickness Ld from the lower surface of the first insulating film 111 to the upper surface of the second insulating film 114 is preferably in the range of 0.3 to 0.7 mm.
- FIG. 4 is a perspective view of a battery according to Embodiment 3 of the present invention.
- the battery includes a battery body 21, a thermal fuse 22, an external electrode 23 of the battery body 21, and a protection circuit 24 electrically connected to the battery body 21.
- the thermal fuse 22 any of the thin thermal fuses according to the first or second embodiment shown in FIGS. 1A to 3B is used.
- the terminal 25 of the thermal fuse 22 and the external electrode 23 are electrically connected at a connection portion 26 by spot welding or the like.
- the electrode 27 of the thermal fuse 22 and the protection circuit 24 are electrically connected at a connection portion 28 by spot welding or the like.
- the components that constitute the protection circuit 24 are mounted on the protection circuit 24 by Pb-free solder such as SnAg or SnCu.
- the thermal fuse 22 cuts off the current from the battery main body 21 when the heat generated from the battery main body 21 exceeds a predetermined level.
- the thin thermal fuse 22 of the above-described battery is for a thermal fuse connected between the tips of a pair of metal terminals 12 located above the first insulating film 11.
- a fusible alloy 13 forming a fusible element is provided.
- the fusible alloy 13 is composed of a Sn—Bi—In alloy containing 20% by weight or more of Sn, 11.5% by weight or more of Bi, and 49% by weight or more of In. Therefore, the fusible alloy 13 does not contain P and Cd, and as a result, Pb and Cd do not elute when the battery is discarded.
- FIG. 5 is a sectional view of a radial thermal fuse according to Embodiment 4 of the present invention.
- the thermal fuse has a bottomed cylindrical or bottomed cylindrical insulation case 31 with an opening.
- PBT polybutylene terephthalate
- PPS polyphenylene sulfide
- PET polyethylene terephthalate
- phenol is composed of any of resin, ceramic, glass, etc.
- the substantially columnar or substantially prismatic fusible alloy 32 is made of a Sn—Bi—In alloy.
- the alloy contains 20% to 39.5% by weight of Sn, 49% to 68.5% by weight of In, and 11.5% to 31% by weight of Bi.
- the Sn—Bi-In alloy that constitutes the fusible alloy 32 if the blending ratio of Sn is less than 20% by weight, In is softer than Sn and Bi is more brittle than Sn. Alloy 32 has insufficient strength, and as a result, handling in the manufacturing process becomes difficult.
- a Sn-Bi-In alloy containing 20% by weight or more of Sn if the compounding ratio of In is less than 49% by weight, Sn becomes excessive, and the compounding ratio of In is 55% by weight. If it is larger, In becomes excessive.
- the melting point of Sn alone is 232 ° C, which is higher than the melting point of In alone, 156 ° C.
- the melting point of the fusible alloy 32 strongly depends on the mixing ratio of Sn. It becomes.
- the compounding ratio of In must be 49% by weight or more, and preferably 49 to 55% by weight, which has a good balance between Sn and In.
- the melting point of the fusible alloy 32 exceeds 95 ° C. when Bi is 11.5% by weight or less. Therefore, for a radial thermal fuse with a fusing temperature of 95 ° C or less used for battery protection, a fusible alloy with a Bi of 11.5 wt% or more must be used.
- the lead conductor 33 is made of a single metal such as (11, Fe, Ni, etc.) or an alloy thereof, and has a surface formed of any one of Sn, Zn, Bi, In, Ag, and Cu.
- a flux (not shown) is applied to the fusible alloy 32, which melts when the ambient temperature rises. Then, the oxide film of the fusible alloy 32 is removed.
- the sealing body 34 for closing the opening of the insulating case 31 is made of a hardening resin such as epoxy or silicon.
- the fusible alloy 32 and the pair of lead conductors 33 are connected by welding or ultrasonic welding. Alternatively, the lead conductor 33 may be connected by melting the fusible alloy 32 by energization.
- a Sn—Bi—In alloy containing 20% by weight or more of Sn, 11.5% by weight or more of Bi, and 49% by weight or more of In is used.
- Pb and Cd are not contained because alloy 32 is used. Therefore, Pb and Cd do not elute from the fusible alloy 32.
- the pair of lead conductors 33, one end of which is connected to the fusible alloy 32, is led out from the opening of the insulating case 31 so that the other end goes out of the insulating case 31 in the same direction. The degree of freedom in mounting the fuse to a battery or the like is improved.
- FIG. 6 is a sectional view of an axial-type thermal fuse according to Embodiment 5 of the present invention.
- the cylindrical insulating case 41 having openings at both ends is made of any of polybutylene terephthalate (PBT), polyphenylene sulfide (PPT), polyethylene terephthalate (PET), phenolic resin, ceramic, glass, etc. It is composed of
- the substantially cylindrical or substantially prismatic fusible alloy 42 disposed in the insulating case 41 is made of a Sn—Bi—In alloy. This alloy contains 20% to 39.5% by weight of Sn, 49% to 68.5% by weight of In, and 11.5% to 31% by weight of Bi.
- an axial thermal fuse containing no Pb or Cd and having a fusing temperature of 95 ° C. or less can be obtained.
- one end of a pair of lead conductors 43 having the other end led out of the insulating case 41 through the opening of the insulating case 41 is connected to both ends of the fusible alloy.
- the openings at both ends of the insulating case 41 are sealed by a sealing body 44.
- the fusible element for a thermal fuse according to the present invention does not contain Pb and Cd, and a thermal fuse using the same does not elute Pb or Cd even after disposal.
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003268769A AU2003268769A1 (en) | 2002-10-07 | 2003-10-06 | Element for thermal fuse, thermal fuse and battery including the same |
KR1020047014097A KR100776875B1 (ko) | 2002-10-07 | 2003-10-06 | 온도 퓨즈용 소자, 온도 퓨즈 및 이를 이용한 전지 |
JP2004541293A JPWO2004031426A1 (ja) | 2002-10-07 | 2003-10-06 | 温度ヒューズ用素子、温度ヒューズおよびそれを用いた電池 |
CN2003801001529A CN1685069B (zh) | 2002-10-07 | 2003-10-06 | 热熔断器用元件、热熔断器及使用它的电池 |
US10/502,686 US20050083166A1 (en) | 2002-10-07 | 2003-10-06 | Element for thermal fuse, thermal fuse and battery including the same |
EP03748719.6A EP1550733B1 (en) | 2002-10-07 | 2003-10-06 | Element for thermal fuse, thermal fuse and battery including the same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002-293865 | 2002-10-07 | ||
JP2002293865 | 2002-10-07 |
Publications (1)
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WO2004031426A1 true WO2004031426A1 (ja) | 2004-04-15 |
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ID=32064017
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2003/012769 WO2004031426A1 (ja) | 2002-10-07 | 2003-10-06 | 温度ヒューズ用素子、温度ヒューズおよびそれを用いた電池 |
Country Status (7)
Country | Link |
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US (1) | US20050083166A1 (ja) |
EP (1) | EP1550733B1 (ja) |
JP (1) | JPWO2004031426A1 (ja) |
KR (1) | KR100776875B1 (ja) |
CN (1) | CN1685069B (ja) |
AU (1) | AU2003268769A1 (ja) |
WO (1) | WO2004031426A1 (ja) |
Cited By (3)
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JP2005346943A (ja) * | 2004-05-31 | 2005-12-15 | Sanyo Electric Co Ltd | パック電池 |
JP2009211936A (ja) * | 2008-03-04 | 2009-09-17 | Toshiba Corp | 非水電解質二次電池および組電池 |
JP2013225522A (ja) * | 2013-06-27 | 2013-10-31 | Toshiba Corp | 非水電解質二次電池および組電池 |
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WO2005006374A2 (en) * | 2003-07-11 | 2005-01-20 | Matsushita Electric Industrial Co., Ltd. | Fusible alloy and thermal fuse |
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KR20150035205A (ko) * | 2013-09-27 | 2015-04-06 | 삼성에스디아이 주식회사 | 이차 전지 |
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- 2003-10-06 KR KR1020047014097A patent/KR100776875B1/ko active IP Right Grant
- 2003-10-06 WO PCT/JP2003/012769 patent/WO2004031426A1/ja active Application Filing
- 2003-10-06 CN CN2003801001529A patent/CN1685069B/zh not_active Expired - Fee Related
- 2003-10-06 AU AU2003268769A patent/AU2003268769A1/en not_active Abandoned
- 2003-10-06 JP JP2004541293A patent/JPWO2004031426A1/ja active Pending
- 2003-10-06 US US10/502,686 patent/US20050083166A1/en not_active Abandoned
- 2003-10-06 EP EP03748719.6A patent/EP1550733B1/en not_active Expired - Fee Related
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005346943A (ja) * | 2004-05-31 | 2005-12-15 | Sanyo Electric Co Ltd | パック電池 |
JP4641744B2 (ja) * | 2004-05-31 | 2011-03-02 | 三洋電機株式会社 | パック電池、パック電池に用いる感熱体及び感熱体 |
JP2009211936A (ja) * | 2008-03-04 | 2009-09-17 | Toshiba Corp | 非水電解質二次電池および組電池 |
JP2013225522A (ja) * | 2013-06-27 | 2013-10-31 | Toshiba Corp | 非水電解質二次電池および組電池 |
Also Published As
Publication number | Publication date |
---|---|
EP1550733A4 (en) | 2006-04-12 |
AU2003268769A1 (en) | 2004-04-23 |
EP1550733A1 (en) | 2005-07-06 |
KR20040099314A (ko) | 2004-11-26 |
CN1685069B (zh) | 2011-11-30 |
JPWO2004031426A1 (ja) | 2006-02-02 |
EP1550733B1 (en) | 2013-08-28 |
KR100776875B1 (ko) | 2007-11-16 |
US20050083166A1 (en) | 2005-04-21 |
CN1685069A (zh) | 2005-10-19 |
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