WO2014010460A1 - 保護素子 - Google Patents
保護素子 Download PDFInfo
- Publication number
- WO2014010460A1 WO2014010460A1 PCT/JP2013/068083 JP2013068083W WO2014010460A1 WO 2014010460 A1 WO2014010460 A1 WO 2014010460A1 JP 2013068083 W JP2013068083 W JP 2013068083W WO 2014010460 A1 WO2014010460 A1 WO 2014010460A1
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- WIPO (PCT)
- Prior art keywords
- heating element
- flux
- shape
- element according
- protective element
- Prior art date
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Classifications
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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
- H01H85/0039—Means for influencing the rupture process of the fusible element
- H01H85/0047—Heating means
- H01H85/0052—Fusible element and series heating means or series heat dams
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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
- H01H85/0039—Means for influencing the rupture process of the fusible element
- H01H85/0047—Heating means
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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
- H01H85/05—Component parts thereof
- H01H85/055—Fusible members
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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
- H01H85/0241—Structural association of a fuse and another component or apparatus
- H01H2085/0275—Structural association with a printed circuit board
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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
- H01H85/46—Circuit arrangements not adapted to a particular application of the protective device
- H01H2085/466—Circuit arrangements not adapted to a particular application of the protective device with remote controlled forced fusing
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- 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
Definitions
- the present invention relates to a protection element that protects a circuit connected on a current path by fusing the current path.
- an overcharge protection or an overdischarge protection operation of the battery pack is performed by turning on / off the output using an FET switch built in the battery pack.
- FET switch When the FET switch is short-circuited for some reason, a lightning surge or the like is applied, and an instantaneous large current flows, or the output voltage drops abnormally due to the life of the battery cell.
- the battery pack and the electronic device must be protected from accidents such as ignition even when the is output. Accordingly, in order to safely shut off the output of the battery cell in any possible abnormal state, a protection element made of a fuse element having a function of cutting off the current path by an external signal is used.
- a heating element is provided inside the protection element.
- a structure that melts a molten conductor is generally used.
- flux is applied to the surface of a soluble conductor (fuse) made of a low melting point metal for the purpose of preventing oxidation, promoting melting / cutting of the soluble conductor, and improving the fusing characteristics.
- a cover member is provided so as to cover the substrate constituting the protection element in order to ensure the quality of the protection element.
- the cover member has a cylindrical projecting shape on the inner surface of the cover member so as to surround the central portion on the soluble conductor in order to hold the applied flux and make the flux amount on the soluble conductor uniform. Has a part.
- the cover member needs to have a height from the soluble conductor corresponding to the height of the protrusion, and this is a factor that restricts the thickness of the protective element. It was.
- an object of the present invention is to realize a protective element in which variation in fusing characteristics is improved by uniformizing the amount of flux applied on the soluble conductor and keeping the position of the flux constant.
- a protection element includes an insulating substrate, a heating element laminated on the insulating substrate, first and second electrodes, and first and second electrodes.
- a heating element internal electrode electrically connected to the heating path between the heating element internal electrode and the heating element internal electrode, the first electrode and the second electrode being connected by heating.
- a soluble conductor having a recess at a position where it is thermally coupled to the heating element, and a flux applied so as to fill the recess. And a recessed part is formed and opened in the side by which a flux is apply
- the concave portions of the heating element and the soluble conductor do not define the positional relationship as long as they are thermally coupled, but are preferably arranged in a stacked manner so that the distance is as short as possible and overlaps.
- the protective element according to the present invention has a recess at a position where it is thermally coupled to the heat generating element of the soluble conductor, and the flux is held so as to be filled in the recess, the heat generating element of the soluble conductor Since the melted state at the position where it is thermally coupled to the substrate is made uniform and the fusible conductor is cut off, variation in fusing characteristics is reduced.
- FIG. 1A is a plan view of a protection element to which the present invention is applied.
- FIG. 1B is a cross-sectional view taken along the line AA ′ with the protective cover attached to FIG. 1A.
- FIG. 2A is a plan view of a protection element in another embodiment to which the present invention is applied.
- 2B is a cross-sectional view taken along the line AA ′ of FIG. 2A.
- FIG. 3 is a cross-sectional view for explaining a reduction in the height of a protective element to which the present invention is applied in comparison with a conventional protective element.
- FIG. 3A shows a comparison of the mounting height of the protection element when the cover is not attached
- FIG. 3B shows a comparison of the mounting height of the protection element when the cover is attached.
- FIG. 3A shows a comparison of the mounting height of the protection element when the cover is not attached
- FIG. 3B shows a comparison of the mounting height of the protection element when the cover is attached.
- FIG. 4A is a plan view of a protection element in another embodiment to which the present invention is applied.
- 4B is a cross-sectional view taken along the line AA ′ of FIG. 4A.
- FIG. 5A is a plan view of a protection element in another embodiment to which the present invention is applied.
- FIG. 5B is a cross-sectional view taken along line AA ′ in FIG. 5A.
- FIG. 6A is a plan view of a protection element in another embodiment to which the present invention is applied.
- 6B is a cross-sectional view taken along line BB ′ of FIG. 6A.
- FIG. 7 is a block diagram showing an application example of a protection element to which the present invention is applied.
- FIG. 7 is a block diagram showing an application example of a protection element to which the present invention is applied.
- FIG. 8 is a diagram showing a circuit configuration example of a protection element to which the present invention is applied.
- 9A to 9C are conceptual cross-sectional views illustrating a procedure for forming a recess in a soluble conductor of a protection element to which the present invention is applied.
- 10A to 10C are conceptual cross-sectional views illustrating a procedure for forming a recess (through hole) in a soluble conductor of a protection element in another embodiment to which the present invention is applied.
- FIG. 11A is a plan view of a protection element according to a modification of the embodiment of the present invention.
- FIG. 11B is a cross-sectional view taken along the line AA ′ of FIG. 11A.
- FIG. 12A is a plan view of a protection element according to a modification of the embodiment of the present invention.
- 12B is a cross-sectional view taken along the line AA ′ of FIG. 12A.
- FIG. 13A is a plan view of a protection element according to a modification of the embodiment of the present invention.
- FIG. 13B is a cross-sectional view taken along line AA ′ of FIG. 13A.
- FIG. 14A is a plan view of a protection element according to a modification of the embodiment of the present invention.
- 14B is a cross-sectional view taken along the line AA ′ of FIG. 14A.
- FIG. 15A is a plan view of a protection element according to a modification of the embodiment of the present invention.
- FIG. 15A is a plan view of a protection element according to a modification of the embodiment of the present invention.
- FIG. 15B is a cross-sectional view taken along the line AA ′ of FIG. 15A.
- FIG. 16A is a plan view of a protection element according to a modification of the embodiment of the present invention.
- 16B is a cross-sectional view taken along the line AA ′ of FIG. 16A.
- FIG. 17A is a plan view of a protection element according to a modification of the embodiment of the present invention.
- FIG. 17B is a cross-sectional view taken along the line AA ′ of FIG. 17A.
- FIG. 18A is a plan view of a protection element according to a modification of the embodiment of the present invention.
- 18B is a cross-sectional view taken along the line AA ′ of FIG. 18A.
- FIG. 19A is a plan view of a protection element according to a modification of the embodiment of the present invention.
- FIG. 19B is a cross-sectional view taken along the line AA ′ of FIG. 19A.
- the protection element 10 includes an insulating substrate 11, a heating element 14 laminated on the insulating substrate 11 and covered with an insulating member 15, and electrodes 12 formed on both ends of the insulating substrate 11. (A1), 12 (A2), the heating element internal electrode 16 laminated on the insulating member 15 so as to overlap the heating element 14, and both ends are connected to the electrodes 12 (A1), 12 (A2), and the center And a fusible conductor 13 connected to the heating element internal electrode 16. To both ends of the heating element 14, heating element electrodes 18 (P1) and 18 (P2) are connected for connecting a power source in order to cause the heating element 14 to generate current and generate heat.
- the soluble conductor 13 is formed with a recess 2 that opens upward at a position overlapping the heating element 14.
- the recessed part 2 is a cylindrical hole part which consists of the wall part 2a and the bottom part 2b.
- the flux 17 is apply
- the cover 1 is used for protecting the inside of the protective element 10 and is formed of an insulating material.
- an insulating material having a predetermined heat resistance such as a liquid crystal polymer, glass epoxy, or ceramics can be used.
- the shape of the concave portion 2 is not limited to the cylindrical shape, and may be formed in a spherical shape. Various shapes can be selected for the purpose of holding the flux 17 as described later.
- the rectangular insulating substrate 11 is formed of an insulating member such as alumina, glass ceramics, mullite, zirconia, and the like.
- an insulating member such as alumina, glass ceramics, mullite, zirconia, and the like.
- the material used for printed wiring boards such as a glass epoxy board
- the heating element 14 has a relatively high resistance value and is a conductive member that generates heat when energized, and is made of, for example, W, Mo, Ru, or the like. These alloys, compositions, or compound powders are mixed with a resin binder or the like to form a paste on the insulating substrate 11 by patterning using a screen printing technique and firing.
- the insulating member 15 is disposed so as to cover the heating element 14, and the heating element internal electrode 16 is disposed so as to face the heating element 14 through the insulating member 15.
- One end of the heating element internal electrode 16 is connected to the heating element electrode 18. Further, one end of the heating element 14 is connected to the other heating element electrode 18.
- the fusible conductor 13 may be a conductive material that melts and blows with a predetermined electric power and heat.
- a BiPbSn alloy, BiPb alloy, BiSn alloy, SnPb alloy, PbIn alloy, ZnAl alloy, InSn alloy, PbAgSn An alloy or the like can be used.
- the soluble conductor 13 may be a laminate of a high melting point metal made of a metal mainly composed of Ag or Cu or Ag or Cu and a low melting point metal such as Pb-free solder mainly composed of Sn. Good.
- the flux 17 may have a low viscosity or a certain degree of viscosity when the protection element 10 is manufactured.
- the recess 2 formed in the soluble conductor 13 may be a through hole penetrating in a cylindrical shape.
- the through hole has a wall 2a.
- the concave portion 2 is applied as a cylindrical hole or through hole so that the concave portion 2 is filled with the flux 17, thereby holding the application position of the flux 17 at a position overlapping the heating element 14.
- the flux 17 is only applied on the fusible conductor, so that the flux 17 cannot be held at a position where it overlaps the heating element. Further, at least the coating thickness of the applied flux 17 is added to the mounting height of the protective element.
- the protection element according to the present invention shown in the right figure of FIG. 3A since the concave portion 2 is coated so as to be filled with the flux 17, the flux 17 is held at a predetermined position, and the conventional protection element is mounted.
- the mounting height can be made lower than the height by the coating thickness of the flux 17.
- the flux 17 can be held at a position overlapping the heating element.
- the mounting height of the protection element is required at least corresponding to the height of the protruding portion 3.
- the protection element according to the present invention shown in the right diagram of FIG. 3B, the flux 17 can be held in the recess 2, and thus the cover 1 needs the protruding portion 3 for holding the flux 17. And not. Therefore, the protection element according to the present invention can realize a reduction in height by the height of the protrusion on the inner surface of the cover, as compared with the conventional protection element.
- the configuration of the protection element 10 is not limited to the configuration described above.
- the recess 2 of the soluble conductor 13 and the heating element 14 only need to be thermally coupled so that the heat generated by the heating element 14 can melt the soluble conductor 13.
- the protection element 10 includes an insulating substrate 11 stacked on the heating element 14, a heating element internal electrode 16 drawn from the heating element 14 and disposed on the insulating substrate 11, You may make it provide the soluble conductor 13 arrange
- the heating element 14 and the fusible conductor 13 together with the insulating substrate 11 as an insulating member, the insulating member 15 in FIG. 1 and the like can be omitted, so that the protective element 10 can be further thinned. enable. Further, since there is no step of laminating the insulating member 15, the manufacturing process is simplified and shortened, which contributes to cost reduction.
- a heat generating element 14 is formed by forming a recess in an insulating laminated substrate 11a, and a laminated substrate 11b is further laminated on the laminated substrate 11a and the heat generating element 14.
- An insulating substrate 11 having 14 as an inner layer can be configured.
- the heating element internal electrode 16 is pulled out on the insulating substrate 11 configured as described above, and electrodes 12 (A1) and 12 (A2) are formed on both ends of the insulating substrate, and the heating element internal electrode 16 to the electrode 12 (A1) are formed.
- the protection element 10 can be configured by connecting the soluble conductor 13.
- the protective element 10 can be further reduced in thickness. To do. Further, by reducing the thickness of the upper layered laminated substrate 11b, it is possible to improve heat conduction and improve the fusing characteristics.
- the fusible conductor 13 and the concave portion 2 thereof and the heating element 14 are arranged at positions where the insulator is sandwiched therebetween, but this will be described below.
- the fusible conductor 13 and the concave portion 2 thereof and the heating element 14 are not necessarily located at the position where they are superposed as long as they are thermally coupled.
- the heating element 14 is disposed on the insulating substrate 11, the heating element internal electrode 16 is drawn out on the same insulating substrate 11, and the electrode 12 (A1) is extracted from the heating element internal electrode 16. , 12 (A2), the fusible conductor 13 may be connected. In this case, the recess 2 of the fusible conductor 13 and the heating element 14 are not superposed and are thermally coupled via the heating element internal electrode 16. Since the heating element 14, the fusible conductor 13, and the insulating substrate 11 are not stacked in the height direction, the protective element 10 can be further reduced in thickness.
- the protection element 10 described above is used in a circuit in a battery pack of a lithium ion secondary battery.
- the protective element 10 is used by being incorporated in a battery pack 20 having a battery stack 25 composed of battery cells 21 to 24 of a total of four lithium ion secondary batteries.
- the battery pack 20 includes a battery stack 25, a charge / discharge control circuit 30 that controls charge / discharge of the battery stack 25, a protection element 10 to which the present invention that protects the battery stack 25 and the charge / discharge control circuit 30 is applied, A detection circuit 26 that detects the voltages of the battery cells 21 to 24 and a current control element 27 that controls the operation of the protection element 10 according to the detection result of the detection circuit 26 are provided.
- the battery stack 25 includes battery cells 21 to 24 that need to be controlled to protect overcharge and overdischarge states.
- the battery stack 25 is detachable via the positive electrode terminal 20a and the negative electrode terminal 20b of the battery pack 20. Are connected to the charging device 35, and a charging voltage from the charging device 35 is applied thereto.
- the electronic device can be operated by connecting the battery pack 20 charged by the charging device 35 to the positive terminal 20a and the negative terminal 20b to the electronic device that is operated by the battery.
- the charge / discharge control circuit 30 includes two current control elements 31 and 32 connected in series to a current path flowing from the battery stack 25 to the charging device 35, and a control unit 33 that controls operations of the current control elements 31 and 32. Is provided.
- the current control elements 31 and 32 are configured by, for example, field effect transistors (hereinafter referred to as FETs), and control the gate voltage by the control unit 33 to control conduction and interruption of the current path of the battery stack 25. .
- FETs field effect transistors
- the control unit 33 operates by receiving power supply from the charging device 35, and according to the detection result by the detection circuit 26, when the battery stack 25 is overdischarged or overcharged, current control is performed so as to cut off the current path. The operation of the elements 31 and 32 is controlled.
- Protective element 10 is connected, for example, on a charge / discharge current path between battery stack 25 and charge / discharge control circuit 30, and its operation is controlled by current control element 27.
- the detection circuit 26 is connected to each of the battery cells 21 to 24, detects the voltage value of each of the battery cells 21 to 24, and supplies the voltage value to the control unit 33 of the charge / discharge control circuit 30.
- the detection circuit 26 outputs a control signal for controlling the current control element 27 when any one of the battery cells 21 to 24 becomes an overcharge voltage or an overdischarge voltage.
- the current control element 27 operates the protection element 10 when the voltage value of the battery cells 21 to 24 exceeds a predetermined overdischarge or overcharge state by the detection signal output from the detection circuit 26, Control is performed so that the charging / discharging current path of the battery stack 25 is cut off regardless of the switching operation of the current control elements 31 and 32.
- the protection element 10 to which the present invention is applied has a circuit configuration as shown in FIG. That is, the protective element 10 includes a soluble conductor 13 having two electrodes 12 (A1) and 12 (A2) at both ends, and a soluble conductor 13 from one electrode 12 (A1) (or electrode 12 (A2)),
- This is a circuit configuration comprising a heating element 14 that energizes the other heating element electrode 18 (P2) via a heating element internal electrode 16 and a heating element electrode 18 (P1), which are connection points of the fusible conductor 13.
- the fusible conductor 13 is connected in series on the charge / discharge current path, and the heating element 14 is connected to the current control element 27.
- the protective element 10 having such a circuit configuration can surely melt the soluble conductor 13 on the current path by the heat generation of the heating element 14 while realizing a further reduction in height.
- the position of the tip of the pressing pin 5 is arranged according to a predetermined position of the fusible conductor 13, that is, the position overlapping the heating element 14, and the pressing pin 5 can be moved in the direction of the arrow. Press against the molten conductor 13.
- the shape of the tip of the pressing pin 5 is, for example, a cylindrical shape.
- a predetermined pressure is applied to the pressing pin 5, and the tip of the pressing pin 5 is pressed against the soluble conductor 13 to a predetermined depth.
- the pressing pin 5 is pulled up in the direction of the arrow and pulled away from the fusible conductor 13. If it does so, the hole part as the recessed part 2 which has the cylindrical wall part 2a and the bottom part 2b will be formed in the position which overlaps with the heat generating body 14 of the soluble conductor 13.
- FIG. 9A the position of the tip of the pressing pin 5 is arranged according to a predetermined position of the fusible conductor 13, that is, the position overlapping the heating element 14, and the pressing pin 5 can
- the pressing pin 5 is moved from below the soluble conductor in the direction of the arrow and pressed against the lower surface of the soluble conductor 13.
- the shape of the tip of the pressing pin 5 is the same as in the case of FIG.
- the pressed pin 5 is pulled upward as it is further pulled up above the fusible conductor 13.
- a circular through-hole having a wall portion 2a is formed at a position overlapping the heating element 14 of the fusible conductor 13.
- the concave portions 2 of various shapes are used. Can be formed.
- concave portions 2 having various shapes can be formed similarly by other known processing techniques such as laser or press molding.
- the concave portion 2 of the fusible conductor 13 when the concave portion 2 of the fusible conductor 13 is formed using the method described in FIG. 10, a protrusion extending upward from the upper end of the wall portion 2a is formed on the upper surface side of the fusible conductor 13.
- the wall portion 2c can be formed together with the wall portion 2a of the through hole.
- the protection element 10 is configured using such a soluble conductor 13
- the concave portion 2 that is a through hole is filled with the flux 17, and the molten state of the soluble conductor 13 due to the heat of the heating element 14 can be made uniform. As a result, variations in fusing characteristics can be reduced.
- the flux 17 can be more stably held at the position of the recessed portion 2 by the protruding wall portion 2 c formed simultaneously with the through hole (recessed portion 2).
- the concave portion 2 of the fusible conductor 13 can be formed only by the protruding wall portion 2c having the wall portion 2a.
- the center of the bottom portion 2b is formed from the periphery of the bottom portion 2b to the substantially central portion of the bottom portion 2b of the concave portion 2 having the wall portion 2a and the bottom portion 2b formed in the cylindrical shape of the fusible conductor 13. You may make it form the protrusion 2d which has a rising gradient toward a part. Especially when the viscosity of the flux 17 is high, the corner on the wall 2a side (peripheral side) of the bottom 2b is difficult to be filled with the flux 17, and voids may be generated.
- the projecting body 2d has a conical shape in contact with the bottom surface of the bottom portion 2b.
- the projecting body 2d is not limited to the conical shape, and may be a hemisphere or the like, and a plurality of projecting bodies may be provided.
- the recess 2 is not limited to the through hole having the wall 2a as shown in FIG. 14, but may be a hole having a wall and a bottom.
- the recess 2 of the fusible conductor 13 is a hole having an inverted conical shape having a wall 2a and a bottom 2b and having a diameter increasing from the bottom 2b toward the opening. Can do.
- the concave portion 2 can be filled so that the flux 17 can be sufficiently distributed to the peripheral portion of the bottom 2b. Therefore, generation of voids after filling the flux 17 can be suppressed and the flux 17 can be fixed uniformly.
- the area of the bottom part 2b of the recessed part 2 can be made very small, and the recessed part 2 of an inverted cone shape can also be formed. Moreover, it is good also as a through-hole of an inverted truncated cone shape by making the bottom part 2b penetrate.
- the shape of the opening and the bottom surface of the concave portion 2 are preferably circular or elliptical, but it is needless to say that the shape may be any shape.
- the shape of the recess 2 may be formed in other polygons such as a rhombus, a square, and a rectangle.
- the shape is not limited to the inverted pyramid shape whose diameter increases from the bottom 2 b toward the opening side, but may be an inverted pyramid shape or an inverted pyramid shape with the bottom 2 b penetrating as described above. It is the same.
- the protruding wall portion 2 c formed upward on the opening periphery of the concave portion 2 and the upper end of the protruding wall portion 2 c It is good also as the recessed part 2 which has the flux holding
- the retention of the flux 17 is enhanced by having the protruding wall portion 2c, but the provision of the flux retention portion 2e allows the protection element 10 to be placed at a position inclined from the horizontal position. Even if it exists, the retainability of the flux 17 is maintained and generation
- the retention of the flux 17 can be enhanced by forming the flux holding portion 2e longer.
- the flux holding portion 2e can be further expanded so as to close the upper opening of the recess 2 while leaving the opening 2f.
- the flux 17 can be injected from one opening 2f and the air can be discharged from the other opening 2f, thereby suppressing the generation of voids more reliably. Can do.
- the formation of the recesses in the modified examples shown in FIGS. 17 to 19 can be manufactured by the above-described method (described in FIGS. 9 and 10).
- FIG. 10 by pressing the pressing pin 5 from below the fusible conductor 13 with a predetermined pressure and utilizing the ductility of the fusible conductor 13 as a metal without penetrating the pressing pin 5, The protruding wall portion 2c and the flux holding portion 2e are formed simultaneously. Thereafter, the through hole can be formed by a pin having a diameter smaller than the diameter of the tip of the pressing pin 5.
- the recess 2 can be formed by using any known method.
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Abstract
Description
本出願は、日本国において、2012年7月12日に出願された日本特許出願番号特願2012-156308を基礎として優先権を主張するものであり、この出願は参照されることにより、本出願に援用される。
図1A及び図1Bに示すように、保護素子10は、絶縁基板11と、絶縁基板11に積層され、絶縁部材15に覆われた発熱体14と、絶縁基板11の両端に形成された電極12(A1),12(A2)と、絶縁部材15上に発熱体14と重畳するように積層された発熱体内部電極16と、両端が電極12(A1),12(A2)に接続され、中央部が発熱体内部電極16に接続された可溶導体13とを備える。発熱体14の両端には、発熱体14に電流を流して発熱させるために電源を接続する発熱体電極18(P1),18(P2)が接続される。可溶導体13には、発熱体14と重畳する位置に、上方に向けて開口する凹部2が形成される。凹部2は、壁部2a及び底部2bからなる円筒形状の穴部である。そして、可溶導体13の凹部2を充填するように、フラックス17が塗布される。図1Bに示すように、カバー1は、保護素子10の内部の保護用に用いられ、絶縁性の材料により形成される。たとえば、液晶ポリマー、ガラスエポキシ、セラミックス等、所定の耐熱性を有する絶縁材料を用いることができる。なお、凹部2の形状は、円筒形状に限らず、球面状に形成されてもよく、また、後述するようにフラックス17を保持する目的とするために様々なものを選定することができる。
図7に示すように、上述した保護素子10は、リチウムイオン二次電池のバッテリパック内の回路に用いられる。
可溶導体13上に凹部2を形成するには、レーザによる開口、凹部2の形状に合わせた押圧ピンによる開口、プレス成型等の周知の加工技術を用いることができる。
以下に、可溶導体13上に形成する凹部2の形状等のバリエーションについて説明する。以下の説明では、図1に示したような絶縁部材15を積層する保護素子10の構成に関して示すが、図4、図5、及び図6に示したような保護素子の構成についても、以下のバリエーションについて適用することができるのは言うまでもない。
Claims (10)
- 絶縁基板と、
上記絶縁基板に積層された発熱体と、
第1及び第2の電極と、
上記第1及び第2の電極の間の電流経路上と上記発熱体とに電気的に接続された発熱体内部電極と、
上記発熱体内部電極から上記第1及び第2の電極にわたって接続され、加熱により、該第1の電極と該第2の電極との間の電流経路を溶断し、上記発熱体と熱的に結合される位置に凹部を有する可溶導体と、
上記凹部を充填するように、塗布されたフラックスとを備え、
上記凹部は、上記フラックスが塗布される側に形成され開口している保護素子。 - 上記凹部は、壁部及び底部を有する穴部であることを特徴とする請求項1記載の保護素子。
- 上記穴部は、円筒形状、逆円錐形状、逆円錐台形状、角柱形状、逆角錐形状及び逆角錐台形状のうちのいずれかに形成されていることを特徴とする請求項2記載の保護素子。
- 上記凹部は、上記可溶導体を貫通する貫通孔であることを特徴とする請求項1記載の保護素子。
- 上記貫通孔は、円筒形状、逆円錐台形状、角柱形状及び逆角錐台形状のうちのいずれかに形成されていることを特徴とする請求項4記載の保護素子。
- 上記凹部の周縁に沿って、該凹部が開口している上方に向かって形成される突状壁部を更に備えることを特徴とする請求項1記載の保護素子。
- 上記突状壁部の先端から、上記凹部の径方向かつ中心方向に向かって壁状に形成されるフラックス保持部を更に備えることを特徴とする請求項6記載の保護素子。
- 上記フラックス保持部は、上記凹部の上面の開口を全て覆い、該フラックスに1つ以上の開口部を有することを特徴とする請求項7記載の保護素子。
- 上記穴部は、該穴部の底部の周辺部から該底部の中央部に向かって上昇勾配を有する突状体を更に備えることを特徴とする請求項2記載の保護素子。
- 上記可溶導体の凹部は、上記発熱体に重畳する位置に形成されることを特徴とする請求項1~9いずれか1項記載の保護素子。
Priority Applications (4)
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US14/408,705 US20150145637A1 (en) | 2012-07-12 | 2013-07-02 | Protection element |
KR20157003400A KR20150036471A (ko) | 2012-07-12 | 2013-07-02 | 보호 소자 |
CN201380037156.0A CN104412352A (zh) | 2012-07-12 | 2013-07-02 | 保护元件 |
HK15108359.1A HK1207740A1 (en) | 2012-07-12 | 2015-08-28 | Protection element |
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JP2012-156308 | 2012-07-12 | ||
JP2012156308A JP2014022050A (ja) | 2012-07-12 | 2012-07-12 | 保護素子 |
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PCT/JP2013/068083 WO2014010460A1 (ja) | 2012-07-12 | 2013-07-02 | 保護素子 |
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US (1) | US20150145637A1 (ja) |
JP (1) | JP2014022050A (ja) |
KR (1) | KR20150036471A (ja) |
CN (1) | CN104412352A (ja) |
HK (1) | HK1207740A1 (ja) |
TW (1) | TW201405618A (ja) |
WO (1) | WO2014010460A1 (ja) |
Families Citing this family (9)
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JP6249600B2 (ja) | 2012-03-29 | 2017-12-20 | デクセリアルズ株式会社 | 保護素子 |
JP6371118B2 (ja) * | 2014-05-30 | 2018-08-08 | デクセリアルズ株式会社 | 保護素子、及びバッテリパック |
TWI615880B (zh) * | 2016-07-19 | 2018-02-21 | He Chang Wei | 保護元件 |
TWI615879B (zh) * | 2016-07-19 | 2018-02-21 | He Chang Wei | 薄型化保護元件 |
JP6957246B2 (ja) * | 2016-11-29 | 2021-11-02 | デクセリアルズ株式会社 | 保護素子 |
CN108630834B (zh) * | 2017-03-20 | 2021-09-07 | 陈葆萱 | 复合式保护元件以及电池组 |
JP6842982B2 (ja) * | 2017-04-21 | 2021-03-17 | ショット日本株式会社 | 保護素子 |
JP7433811B2 (ja) * | 2019-08-23 | 2024-02-20 | デクセリアルズ株式会社 | ヒューズエレメント、ヒューズ素子および保護素子 |
JP7349954B2 (ja) * | 2020-04-13 | 2023-09-25 | ショット日本株式会社 | 保護素子 |
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JP2010170803A (ja) * | 2009-01-21 | 2010-08-05 | Sony Chemical & Information Device Corp | 保護素子 |
JP2010170802A (ja) * | 2009-01-21 | 2010-08-05 | Sony Chemical & Information Device Corp | 保護素子 |
JP2011249177A (ja) * | 2010-05-28 | 2011-12-08 | Kyocera Corp | ヒューズ装置および回路基板 |
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DE3824865A1 (de) * | 1988-07-21 | 1990-01-25 | Productech Gmbh | Herstellen von loetflaechen |
US5097247A (en) * | 1991-06-03 | 1992-03-17 | North American Philips Corporation | Heat actuated fuse apparatus with solder link |
JP2001325869A (ja) * | 2000-05-17 | 2001-11-22 | Sony Chem Corp | 保護素子 |
JP2004265618A (ja) * | 2003-02-05 | 2004-09-24 | Sony Chem Corp | 保護素子 |
US9129769B2 (en) * | 2009-09-04 | 2015-09-08 | Cyntec Co., Ltd. | Protective device |
-
2012
- 2012-07-12 JP JP2012156308A patent/JP2014022050A/ja active Pending
-
2013
- 2013-07-02 US US14/408,705 patent/US20150145637A1/en not_active Abandoned
- 2013-07-02 WO PCT/JP2013/068083 patent/WO2014010460A1/ja active Application Filing
- 2013-07-02 CN CN201380037156.0A patent/CN104412352A/zh active Pending
- 2013-07-02 KR KR20157003400A patent/KR20150036471A/ko not_active Application Discontinuation
- 2013-07-11 TW TW102124883A patent/TW201405618A/zh unknown
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JP2010170803A (ja) * | 2009-01-21 | 2010-08-05 | Sony Chemical & Information Device Corp | 保護素子 |
JP2010170802A (ja) * | 2009-01-21 | 2010-08-05 | Sony Chemical & Information Device Corp | 保護素子 |
JP2011249177A (ja) * | 2010-05-28 | 2011-12-08 | Kyocera Corp | ヒューズ装置および回路基板 |
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CN104412352A (zh) | 2015-03-11 |
JP2014022050A (ja) | 2014-02-03 |
US20150145637A1 (en) | 2015-05-28 |
KR20150036471A (ko) | 2015-04-07 |
HK1207740A1 (en) | 2016-02-05 |
TW201405618A (zh) | 2014-02-01 |
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