WO2016190078A1 - Élément de protection et élément fusible - Google Patents

Élément de protection et élément fusible Download PDF

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Publication number
WO2016190078A1
WO2016190078A1 PCT/JP2016/063832 JP2016063832W WO2016190078A1 WO 2016190078 A1 WO2016190078 A1 WO 2016190078A1 JP 2016063832 W JP2016063832 W JP 2016063832W WO 2016190078 A1 WO2016190078 A1 WO 2016190078A1
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WO
WIPO (PCT)
Prior art keywords
fuse element
elastic member
fuse
electrode
electrodes
Prior art date
Application number
PCT/JP2016/063832
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English (en)
Japanese (ja)
Inventor
千智 小森
佐藤　浩二
Original Assignee
デクセリアルズ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by デクセリアルズ株式会社 filed Critical デクセリアルズ株式会社
Priority to KR1020177032536A priority Critical patent/KR102077450B1/ko
Priority to CN201680027404.7A priority patent/CN107533935B/zh
Publication of WO2016190078A1 publication Critical patent/WO2016190078A1/fr

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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
    • 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

Definitions

  • the present invention relates to a protection element and a fuse element that use a fuse element that is mounted on a current path and cuts off due to self-heating when a current exceeding a rating flows, or heat generated by a heating element, and interrupts the current path.
  • Some types of protection elements perform overcharge protection or overdischarge protection operation of the battery pack 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, when a lightning surge or the like is applied and an instantaneous large current flows, the output voltage drops abnormally due to the life of the battery cell, or conversely an excessively abnormal voltage
  • a protective element made of a fuse having a function of interrupting a current path by an external signal is used in order to safely interrupt the output of the battery cell in any possible abnormal state.
  • the protective element 100 of the protective circuit for such a lithium ion secondary battery is formed on an insulating substrate 101 and connected on a current path.
  • the fuse element 104 is connected between the first and second electrodes 102 and 103 and the first and second electrodes 102 and 103 to form a part of the current path, and the fuse element 104 on the current path is formed. May be melted by a self-heating due to overcurrent or by a heating element 105 provided inside the protection element 100.
  • the molten liquid fuse element 104 is provided on the first and second electrodes 102 and 103 and between the first and second electrodes 102 and 103 and connected to the heating element 105.
  • the current path is interrupted by collecting on the generated heating element extraction electrode 107.
  • the fuse element 104 contains Pb having a melting point of 300 ° C. or higher so as not to melt by heating when mounted by reflow soldering or the like. High melting point solder is used.
  • the fuse element 104 is heated, oxidation progresses and hinders melting, so that an oxide film generated on the fuse element 104 is removed, and a flux 106 is laminated to improve the wettability of the fuse element 104. It has been broken.
  • the rating of the protection element 100 of the protection circuit for lithium ion secondary batteries is also required to be improved.
  • it is required to lower the conductor resistance of the fuse element 104, and the fuse element 104 must be enlarged.
  • the fuse element 104 is mainly composed of a metal such as Pb or Sn, the coefficient of linear expansion is generally large. For this reason, the fuse element 104 repeats expansion and contraction according to the ambient temperature in the environment where the electronic device in which the protection element 100 is mounted is used. However, since the fuse element 104 is fixed to the first and second electrodes 102 and 103 and the heating element extraction electrode 107 by connection solder or the like, stress due to expansion and contraction is applied to the connection solder and each electrode 102. , 103, 107, or the fuse element 104. This stress increases as the volume of the fuse element 104 increases.
  • the insulating substrate 101 is mainly made of ceramic, the linear expansion coefficient is much smaller than that of the fuse element 104 made of metal. For this reason, stress is applied between the fuse element 104 and the insulating substrate 101 due to fluctuations in the ambient temperature, and the fuse element 104 itself, the first and second electrodes 102 and 103, the heating element extraction electrode 107, There is a risk that stress strain concentrates on the fusing portion of the fuse element 104 that is not joined to the electrodes 102, 103, and 107 and breaks.
  • the fusing characteristics fluctuate, and the fusing characteristics do not fusing depending on a predetermined temperature and overcurrent, or the fusing time is extended. May not be able to be maintained.
  • an object of the present invention is to provide a protection element and a fuse element that can relieve stress that increases with an increase in size of a fuse element and can maintain stable fusing characteristics even when the ambient temperature changes. .
  • a protective element supports a first electrode and a second electrode, a fuse element connected between the first and second electrodes, and the fuse element.
  • the fuse element is fixed with an elastic member interposed between the casing element and the structural member.
  • a fuse element in addition, includes a first electrode and a second electrode, a fuse element connected between the first and second electrodes, and a housing that supports the fuse element, The fuse element is fixed with an elastic member interposed between the casing-side constituent members.
  • the elastic member since the elastic member is interposed between the component member on the element housing side and the fuse element, the elastic member can absorb and relieve the stress generated with the change of the temperature environment. It is possible to prevent the component member on the element housing side from being broken.
  • FIG. 1A and 1B are diagrams showing a protective element to which the present invention is applied, in which FIG. 1A is a plan view with a cover member omitted, and FIG. 1B is a cross-sectional view taken along line XX ′ in FIG. .
  • FIG. 2 is a diagram showing a state in which the elastic member follows and relaxes stress as the fuse element expands and contracts due to a temperature change.
  • FIG. 2A is a cross-sectional view showing the expansion of the fuse element.
  • FIG. 5 is a cross-sectional view showing the fuse element when contracted.
  • FIG. 3 is a cross-sectional view showing a protection element using an elastic member in which a core material is impregnated with a flux.
  • FIG. 4 is a cross-sectional view showing a protection element in which a fuse element is joined by an elastic member provided on the first and second electrodes.
  • FIG. 5 is a cross-sectional view showing a protection element in which a heating element is provided on the back surface of the insulating substrate.
  • FIG. 6 is a cross-sectional view showing a protection element in which an elastic member is provided on the first and second electrodes and the heating element extraction electrode.
  • FIG. 7 is a cross-sectional view showing a protection element in which an elastic member is provided on an insulating layer and interposed between the fuse element and a fusing part.
  • FIG. 8 is a cross-sectional view showing a protection element provided with an elastic member on the cover member and interposed between the cover element and the fuse element.
  • FIG. 9 is a cross-sectional view showing a protection element using a metal plate that is supported independently from the element housing as the first and second electrodes.
  • FIG. 10 is a cross-sectional view showing the protection element shown in FIG. 9, in which an elastic member is provided on the insulating layer and interposed between the fuse element and the fusing part.
  • FIG. 11 is a cross-sectional view of the protection element shown in FIG. 9, in which an elastic member is provided on the cover member and interposed between the protection element and the fuse element.
  • FIG. 12 is a circuit diagram of a battery pack on which a protection element is mounted.
  • FIG. 13 is a circuit diagram of the protection element, where (A) shows before the fuse element is blown and (B) shows after the fuse element is blown.
  • FIG. 14A and 14B are cross-sectional views showing the operating state of the protection element.
  • FIG. 14A shows a state in which the heating element starts to generate heat when energized
  • FIG. 14B shows a state in which the fuse element starts to melt
  • FIG. The melted state is shown.
  • FIG. 15 is a cross-sectional view showing a fuse element to which the present invention is applied.
  • FIG. 16 is a circuit diagram of the fuse element, where (A) shows before the fuse element is blown and (B) shows after the fuse element is blown.
  • FIG. 17 is a cross-sectional view showing a fuse element in which an elastic member is provided on an insulating substrate and interposed between the fuse element and a fused portion.
  • FIG. 18 is a cross-sectional view illustrating a fuse element in which an elastic member is provided on a cover member and interposed between the cover element and the fuse element.
  • 19A and 19B are views showing a conventional protection element with a cover member omitted, wherein FIG. 19A is an external perspective view, and FIG. 19B is a cross-sectional view.
  • a protection element 10 to which the present invention is applied includes an insulating substrate 11, a heating element 14 laminated on the insulating substrate 11 and covered with an insulating layer 15, and an insulating substrate. 11, the first electrode 12 and the second electrode 13 formed at both ends, the heating element extraction electrode 16 stacked on the insulating layer 15 so as to overlap the heating element 14, and both ends of the first and second electrodes.
  • the fuse element 17 is connected to each of the electrodes 12 and 13, and the central portion is connected to the heating element extraction electrode 16.
  • a cover member 18 that protects the inside is mounted on the insulating substrate 11.
  • the protective element 10 includes a first and second electrodes 12 and 13 formed on the insulating substrate 11, a heating element 14, an insulating layer 15, a heating element extraction electrode 16, and a cover member 18 to form an element casing.
  • the fuse element 17 is fixed with an elastic member 20 interposed between the component members on the element housing side.
  • the insulating substrate 11 is formed in, for example, a substantially rectangular shape using an insulating member such as alumina, glass ceramics, mullite, zirconia.
  • the insulating substrate 11 may be made of a material used for a printed wiring board such as a glass epoxy board or a phenol board.
  • First and second electrodes 12 and 13 are formed on opposite ends of the insulating substrate 11.
  • the first and second electrodes 12 and 13 are each formed of a conductive pattern such as Ag or Cu.
  • the first and second electrodes 12 and 13 are continuous from the front surface 11a of the insulating substrate 11 with the first and second external connection electrodes 12a and 13a formed on the back surface 11b through castellation.
  • the protection element 10 is formed by connecting the first and second external connection electrodes 12a and 13a formed on the back surface 11b to connection electrodes provided on a circuit board such as a battery circuit on which the protection element 10 is mounted. Incorporated into a part of the current path formed on the circuit board.
  • the heating element 14 is a conductive member that has a relatively high resistance value and generates heat when energized, and is made of, for example, nichrome, W, Mo, Ru, or a material containing these.
  • the heating element 14 is obtained by mixing a powdery body of these alloys, compositions, or compounds with a resin binder or the like, forming a paste on the insulating substrate 11 using a screen printing technique, and firing it. Etc. can be formed.
  • the protective element 10 is provided with an insulating layer 15 so as to cover the heating element 14, and a heating element extraction electrode 16 is formed so as to face the heating element 14 through the insulating layer 15.
  • the heating element lead electrode 16 is connected to the fuse element 17, whereby the heating element 14 is superimposed on the fuse element 17 via the insulating layer 15 and the heating element lead electrode 16.
  • the insulating layer 15 is provided to protect and insulate the heating element 14 and to efficiently transmit the heat of the heating element 14 to the fuse element 17 and is made of, for example, a glass layer.
  • the protective element 10 may laminate an insulating layer 15 between the heating element 14 and the insulating substrate 11 in order to efficiently transmit the heat of the heating element 14 to the fuse element 17.
  • the heating element 14 may be formed on the back surface 11b opposite to the front surface 11a of the insulating substrate 11 on which the first and second electrodes 12 and 13 are formed. It may be formed adjacent to the first and second electrodes 12 and 13 on the surface 11a. Further, the protection element 10 may have the heating element 14 formed inside the insulating substrate 11.
  • the heating element 14 has one end connected to the heating element extraction electrode 16 and the other end connected to the heating element electrode 19.
  • the heating element lead electrode 16 is formed on the surface 11 a of the insulating substrate 11 and is laminated on the insulating layer 15 so as to face the heating element 14 and the lower layer portion 16 a connected to the heating element 14, and the fuse element 17. And an upper layer portion 16b connected to the.
  • the heating element 14 is electrically connected to the fuse element 17 via the heating element extraction electrode 16.
  • the heating element extraction electrode 16 is disposed opposite to the heating element 14 with the insulating layer 15 interposed therebetween, whereby the fuse element 17 can be melted and the molten conductor can be easily aggregated.
  • the heating element electrode 19 is formed on the front surface 11a of the insulating substrate 11, and is continuously connected to the heating element feeding electrode 19a (see FIG. 13A) formed on the back surface 11b of the insulating substrate 11 through castellation. ing.
  • the protective element 10 has a fuse element 17 connected from the first electrode 12 to the second electrode 13 via the heating element extraction electrode 16.
  • the fuse element 17 is used as a fusible conductor of the protection element 10. In normal use, the fuse element 17 conducts between the first and second electrodes 12 and 13, and part of the current path of the external circuit in which the protection element 10 is incorporated. Constitute.
  • the fuse element 17 is blown by self-heating (Joule heat) when a current exceeding the rating is applied, or is blown by the heat generated by the heating element 14 to cut off between the first and second electrodes 12 and 13. .
  • the fuse element 17 is made of a material that is quickly blown by the heat generated by the heat generating element 14 or self-heating, and for example, a low melting point metal such as Pb-free solder containing Sn as a main component can be suitably used.
  • the fuse element 17 may use an alloy such as In, Pb, Ag, or Cu, or a low melting point metal such as Pb-free solder containing Sn as a main component, and Ag, Cu, or these as a main component. It may be a laminate with a refractory metal such as an alloy.
  • the fuse element 17 can be easily connected by reflow soldering via the connecting solder 21 provided on the first and second electrodes 12 and 13.
  • the protection element 10 is provided with the fuse element 17 at a position overlapping the heating element 14 via the insulating layer 15 and the heating element extraction electrode 16, so that the heat generated by the heating element 14 is efficiently supplied to the fuse element 17. It can be reported and blown out quickly.
  • the protective element 10 is required to lower the conductor resistance of the fuse element 17 in order to improve the rating and allow more current to flow. Therefore, the protective element 10 is increased in size by increasing the volume of the fuse element 17.
  • the fuse element 17 shown in FIG. 1 is connected to the first and second electrodes 12 and 13 by a connection material such as connection solder 21 and the heating element extraction electrode 16 provided on the element housing side of the protection element 10.
  • the elastic member 20 interposed between the two is connected.
  • the elastic member 20 is configured on the element housing side of the fuse element 17, the heating element extraction electrode 16, the first and second electrodes 12, 13, etc., with a change in temperature of the usage environment of the electronic device on which the protection element 10 is mounted. It relieves stress caused by the difference in coefficient of linear expansion from the member. That is, the fuse element 17 can be formed of a metal material such as Sn, and has a larger linear expansion coefficient than the insulating substrate 11 formed of ceramic or the like. For this reason, when the ambient temperature rises, the fuse element 17 fixed on the first and second electrodes 12 and 13 by the connecting solder 21 has the first and second electrodes formed on the insulating substrate 11. Stress is generated between 12, 13 and the heating element extraction electrode 16.
  • the protection element 10 repeats expansion and contraction of the component parts on the element housing side such as the fuse element 17 and the insulating substrate 11 due to the temperature cycle, and the linear expansion coefficient is increased between the fuse element 17 and the element housing side. Stress distortion corresponding to the difference occurs.
  • the elastic member 20 is interposed between the heating element extraction electrode 16 and the fuse element 17 on the element housing side, so that the stress can be absorbed and relaxed, and the heating element extraction electrode 16 and the fuse element 17 are broken. It can be prevented from occurring.
  • the protection element 10 includes a fuse element 17 that is changed between the first electrode 12 and the heating element extraction electrode 16 and the second electrode 13 and the heating element extraction electrode 16 due to a temperature change. 2 is expanded (FIG. 2A) or contracted (FIG. 2B), and stress is concentrated on the heating element extraction electrode 16.
  • the insulation substrate 11 or the like Even when the amount of change on the element housing side is small and the stress strain increases, the elastic member 20 provided on the heating element extraction electrode 16 deforms following the expansion change of the fuse element 17, so that the fuse element 17 and the heating element are deformed. The stress on the element housing side such as the extraction electrode 16 can be relaxed.
  • the protection element 10 does not break at the joint portion with the fuse element 17 such as the fuse element 17, the first and second electrodes 12 and 13 on the element housing side, and the heating element extraction electrode 16. Therefore, the protection element 10 can maintain the fusing characteristics by fusing the fuse element 17 in a predetermined time due to the heat generated by the heating element 14 or fusing in a predetermined time when overcurrent occurs.
  • the elastic member 20 may be any member that can relieve the stress generated between the fuse element 17 and the element housing, and may have either elastic or viscoelastic properties.
  • the elastic member 20 has conductivity when it is interposed between the heating element extraction electrode 16 and the fuse element 17. Thereby, the fuse element 17 and the heating element extraction electrode 16 are also electrically connected via the elastic member 20.
  • the elastic member 20 can be provided with elasticity and conductivity by forming a conductive layer 20b on the core material 20a having elasticity by conducting a conductive coating by solder coating, Ag plating, or the like. In addition, you may form the elastic member 20 only with the member which has elasticity and electroconductivity, without forming the conductive layer 20b.
  • the elastic member 20 has a surface formed with a conductive bonding material such as solder, so that the fuse element 17 can be bonded to the heating element extraction electrode 16 by the conductive layer 20b.
  • the elastic member 20 preferably uses a conductive material having elasticity as a core material having elasticity.
  • the elastic member 20 can be formed by using a sheet-like woven fabric or non-woven fabric using a linear conductive material such as a conductive fiber and appropriately performing a conductive coating such as solder coating or Ag plating.
  • the elastic member 20 may be made of a porous material.
  • a porous resin sheet such as PTFE (polytetrafluoroethylene) is used as the core material 20a, and a conductive material such as solder coat or Ag plating is used. It can be formed by covering and providing the conductive layer 20b.
  • the protection element 10 transmits the heat of the heating element 14 to the fuse element 17 through the heating element extraction electrode 16 and the elastic member 20 and heats it, a material having excellent thermal conductivity is used as the elastic member 20. preferable.
  • the elastic member 20 is formed using conductive fibers or a porous material, and impregnated with a melting accelerator such as a flux 22 that prevents the fuse element 17 from being oxidized and promotes melting. You may let them. As a result, when the elastic member 20 is heated by the heating element 14, the impregnated flux 22 oozes out and can prevent the fuse element 17 from being oxidized. As a result, the protection element 10 can accelerate the melting of the fuse element 17 and can quickly cut off the first and second electrodes 12 and 13.
  • a melting accelerator such as a flux 22 that prevents the fuse element 17 from being oxidized and promotes melting. You may let them.
  • the protection element 10 can accelerate the melting of the fuse element 17 and can quickly cut off the first and second electrodes 12 and 13.
  • the elastic member 20 may use a woven or non-woven fabric made of a linear insulating material as the core material 20a and may be impregnated with a melting accelerator such as a flux 22 that promotes melting of the fuse element 17.
  • a melting accelerator such as a flux 22 that promotes melting of the fuse element 17.
  • the elastic member 20 can be provided with conductivity by appropriately conducting a conductive coating by solder coating, Ag plating, or the like to form the conductive layer 20b.
  • the protection element 10 may be coated with a flux 22 on the front surface or the back surface of the fuse element 17 in order to prevent the fuse element 17 from being oxidized, remove the oxide at the time of fusing, and improve the fluidity of the solder.
  • a flux 22 on the front surface or the back surface of the fuse element 17 in order to prevent the fuse element 17 from being oxidized, remove the oxide at the time of fusing, and improve the fluidity of the solder.
  • the flux 22 the wettability of the fuse element 17 (for example, solder) is enhanced during the actual use of the protection element 10, and the oxide is removed while the fuse element 17 is dissolved, thereby quickly fusing. Can be improved.
  • the oxide of the antioxidant film can be removed.
  • the oxidation of the fuse element 17 can be effectively prevented, and the fast fusing property can be maintained and improved.
  • the first and second electrodes 12 and 13, the heating element extraction electrode 16 and the heating element electrode 19 are formed by a conductive pattern such as Ag or Cu, and the surface is appropriately Sn-plated, Ni / Au plated, Ni A protective layer such as / Pd plating or Ni / Pd / Au plating is preferably formed. Thereby, the surface oxidation can be prevented, and the erosion of the first and second electrodes 12 and 13 and the heating element extraction electrode 16 by the connection material such as the connection solder 21 of the fuse element 17 can be suppressed.
  • the protective element 10 is provided with a cover member 18 on the surface 11a of the insulating substrate 11 on which the fuse element 1 is provided.
  • the cover member 18 protects the inside and prevents the molten fuse element 17 from scattering.
  • the cover member 18 can be formed of an insulating member such as various engineering plastics and ceramics.
  • the cover member 18 is connected to the surface 11 a of the insulating substrate 11 by an insulating adhesive, and thereby covers the fuse element 17.
  • Such a protective element 10 is formed with a heating path to the heating element 14 that reaches the heating element feeding electrode 19 a, the heating element electrode 19, the heating element 14, the heating element extraction electrode 16, the elastic member 20, and the fuse element 17. Further, the protection element 10 is connected to an external circuit in which the heating element electrode 19 energizes the heating element 14 via the heating element feeding electrode 19a, and the energization across the heating element electrode 19 and the fuse element 17 is controlled by the external circuit. .
  • the protection element 10 constitutes a part of the energization path to the heating element 14 by connecting the fuse element 17 to the heating element extraction electrode 16. Therefore, when the fuse element 17 is melted and the connection with the external circuit is interrupted, the protective element 10 can also stop the heat generation because the energization path to the heating element 14 is also interrupted.
  • the elastic member 20 is provided only on the heating element extraction electrode 16 to support the fuse element 17.
  • the first and second electrodes 12, 13 are provided.
  • the elastic member 20 may be provided thereon, and the connecting solder 21 may be provided on the heating element extraction electrode 16.
  • the elastic member 20 provided on the first electrode 12 absorbs and relaxes the stress between the first electrode 12 and the heating element extraction electrode 16, so that the second electrode
  • the elastic member 20 provided on 13 absorbs and relaxes the stress between the second electrode 13 and the heating element extraction electrode 16.
  • the protection element 30 may form the heating element 14 on the back surface 11b of the insulating substrate 11 as described above. At this time, as shown in FIG. 5, the protection element 30 overlaps the heating element extraction electrode 16 with the heating element 14 with the insulating substrate 11 interposed therebetween, and fuses the heating element extraction electrode 16 via the connecting solder 21. It is preferable to connect the elements 17. Thereby, the heat of the heating element 14 can be efficiently transmitted to the fuse element 17 through the heating element lead-out electrode 16 and the connecting solder 21, and the fuse element 17 can be blown immediately after the heating element 14 generates heat. it can.
  • the protective element includes an elastic member 20 in which a conductive layer 20b is formed on the first and second electrodes 12, 13 and the heating element extraction electrode 16 with a bonding material such as solder. It may be provided.
  • the fuse element 17 is joined to the first and second electrodes 12 and 13 and the heating element extraction electrode 16 by the conductive layer 20b of the elastic member 20 and is electrically connected. It is done.
  • the protective element 40 shown in FIG. 6 has a stress between the fuse element 17 and the element housing side by the elastic members 20 provided on the first and second electrodes 12 and 13 and the heating element extraction electrode 16. Is absorbed and relaxed.
  • the protection element may be provided with an elastic member 20 on the insulating layer 15.
  • the fuse element 17 is bonded to the first and second electrodes 12 and 13 and the heating element extraction electrode 16 by the connection solder 21 and is electrically connected.
  • the protective element 50 is provided on the insulating layer 15 at the fusing part 17 a between the first electrode 12 and the heating element extraction electrode 16 and between the second electrode 13 and the heating element extraction electrode 16.
  • the elastic member 20 is connected.
  • the fusing part 17a of the fuse element 17 refers to a fusing part in the fuse element 17 connected between the heating element extraction electrode 16 and the first and second electrodes 12 and 13, and specifically, the heating element extraction. It means between the electrode 16 and the first electrode 12 and between the heating element extraction electrode 16 and the second electrode 13.
  • the fuse element 17 is joined to the first and second electrodes 12, 13 and the heating element extraction electrode 16 by the connecting solder 21, so that the portions that expand and contract are the electrodes 12. , 13, and 16, the fusing part 17 a is not fixed to the fusing part 17 a, and the elastic member 20 is provided to effectively absorb and relieve the stress between the fuse element 17 and the element housing side. be able to.
  • the fuse element 17 may be joined by providing the elastic member 20 at one or more of the first and second electrodes 12 and 13 and the heating element extraction electrode 16.
  • the protection element may be provided with an elastic member 20 on a cover member 18 that covers the fuse element 17.
  • the fuse element 17 is joined to the first and second electrodes 12 and 13 and the heating element extraction electrode 16 by the connection solder 21 and is electrically connected.
  • the elastic member 20 is joined to the fuse element 17 and the cover member 18.
  • the elastic member 20 provided on the cover member 18 does not necessarily have conductivity.
  • the elastic member 20 is interposed between the fuse element 17 and the cover member 18 that is a component member on the element casing side, so that the stress between the fuse element 17 and the element casing side is affected by the cover member 18. Absorbed and relaxed by the elastic member 20 that is moved to the side and connected to the cover member 18.
  • both surfaces of the fuse element 17 may be sandwiched by the elastic member 20 by providing the elastic member 20 on the heating element extraction electrode 16 and connecting it to the fuse element 17. Accordingly, the protection element 60 can effectively absorb and relieve stress between the fuse element 17 and the element housing side on both sides of the insulating substrate 11 side and the cover member 18 side.
  • the protective element 60 includes the first and second electrodes 12 and 13, the heating element extraction electrode 16, and an elastic member at one or more places between the insulating substrate 11 and the fusing part 17 a.
  • the protective element 60 includes the first and second electrodes 12 and 13, the heating element extraction electrode 16, and an elastic member at one or more places between the insulating substrate 11 and the fusing part 17 a.
  • the protective element may be configured by a metal plate in which the first and second electrodes 12 and 13 are supported independently from the element housing.
  • the first and second electrodes 12 and 13 are made of a metal plate that can be used for large current applications, and are screwed to a support member such as an external circuit board (not shown). It is supported.
  • a heating element 14, an insulating layer 15, a heating element extraction electrode 16, and an elastic member 20 are provided on the insulating substrate 11, a heating element 14, an insulating layer 15, a heating element extraction electrode 16, and an elastic member 20 are provided.
  • the protective element 70 is an elastic member in which the fuse element 17 is connected to the first and second electrodes 12 and 13 via the connection solder 21 and is interposed between the heating element lead electrode 16. 20 is connected.
  • 9 includes a fuse element 17 and first and second electrodes 12 and 13 supported by a support mechanism (not shown) and an element housing side by an elastic member 20 provided on the heating element extraction electrode 16. The stress between is absorbed and relaxed.
  • the protective element 70 may also be provided with the elastic member 20 on the first and second electrodes 12 and 13 and absorb the stress together with the elastic member 20 provided on the heating element extraction electrode 16. Further, the protective element 70 may be provided with the elastic member 20 at one or more of the first and second electrodes 12 and 13 and the heating element extraction electrode 16.
  • the protective element 70 is provided with the elastic member 20 on the heating element extraction electrode 16, and the elastic member 20 is also provided on the insulating layer 15. Absorption and relaxation may be performed.
  • the protective element 70 may be provided with the elastic member 20 only on the insulating layer 15, and the connecting solder 21 may be provided on the first and second electrodes 12, 13 and the heating element extraction electrode 16.
  • the elastic member 20 is provided on the insulating layer 15, and the elastic member 20 is provided at one or more of the first and second electrodes 12, 13 and the heating element extraction electrode 16. Good.
  • the protective element 70 may be provided with an elastic member 20 on the cover member 18.
  • the elastic member 20 provided on the cover member 18 does not necessarily have conductivity.
  • the protective element 70 is provided with the elastic member 20 on the cover member 18, and the elastic member 20 is provided at one or more of the first and second electrodes 12 and 13, the heating element extraction electrode 16 and the insulating layer 15. It may be.
  • protection element 10 is used by being incorporated in a circuit in a battery pack 80 of a lithium ion secondary battery, for example.
  • the battery pack 80 includes, for example, a battery stack 82 including battery cells 81a to 81d of a total of four lithium ion secondary batteries.
  • the battery pack 80 includes a battery stack 82, a charge / discharge control circuit 83 that controls charging / discharging of the battery stack 82, a protection element 10 to which the present invention that cuts off charging when the battery stack 82 is abnormal, and each battery cell.
  • a detection circuit 84 for detecting voltages 81a to 81d and a current control element 85 for controlling the operation of the protection element 10 according to the detection result of the detection circuit 84 are provided.
  • the battery stack 82 is formed by connecting battery cells 81a to 81d that need to be controlled to protect against overcharge and overdischarge states, and is detachable via the positive terminal 80a and the negative terminal 80b of the battery pack 80. Are connected to the charging device 86, and a charging voltage from the charging device 86 is applied thereto.
  • the battery pack 80 charged by the charging device 86 can be operated by connecting the positive electrode terminal 80a and the negative electrode terminal 80b to the electronic device operated by the battery.
  • the charge / discharge control circuit 83 includes two current control elements 87 and 88 connected in series to a current path flowing from the battery stack 82 to the charging device 86, and a control unit 89 that controls operations of these current control elements 87 and 88. Is provided.
  • the current control elements 87 and 88 are configured by, for example, field effect transistors (hereinafter referred to as FETs), and control the gate voltage by the control unit 89 to control conduction and interruption of the current path of the battery stack 82. .
  • FETs field effect transistors
  • the control unit 89 operates by receiving power supply from the charging device 86, and controls the current so as to cut off the current path when the battery stack 82 is overdischarged or overcharged according to the detection result by the detection circuit 84. The operation of the elements 87 and 88 is controlled.
  • the protection element 10 is connected, for example, on a charge / discharge current path between the battery stack 82 and the charge / discharge control circuit 83, and its operation is controlled by the current control element 85.
  • the detection circuit 84 is connected to each of the battery cells 81a to 81d, detects the voltage value of each of the battery cells 81a to 81d, and supplies the voltage value to the control unit 89 of the charge / discharge control circuit 83.
  • the detection circuit 84 outputs a control signal for controlling the current control element 85 when any one of the battery cells 81a to 81d becomes an overcharge voltage or an overdischarge voltage.
  • the current control element 85 is constituted by, for example, an FET, and when the voltage value of the battery cells 81a to 81d exceeds a predetermined overdischarge or overcharge state by the detection signal output from the detection circuit 84, the protection element 10 is operated to control the charge / discharge current path of the battery stack 82 to be cut off regardless of the switching operation of the current control elements 87 and 88.
  • 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 is energized through the connecting point between the fuse element 17 and the fuse element 17 connected in series across the first and second external connection electrodes 12 a and 13 a via the heating element extraction electrode 16.
  • the circuit configuration includes a heating element 14 that melts the fuse element 17 by generating heat.
  • the fuse element 17 is connected in series on the charge / discharge current path of the battery pack 80 via the first and second external connection electrodes 12 a and 13 a, and the heating element 14 is connected to the heating element electrode 19.
  • the first external connection electrode 12 a of the protection element 10 is connected to one open end side of the battery stack 82, and the second external connection electrode 13 a is connected to the positive electrode terminal 80 a side of the battery pack 80.
  • the protection element 10 When the protection element 10 having such a circuit configuration needs to cut off the current path of the battery pack 80, the protection element 10 is provided by a current control element 85 provided in the battery pack 80 as shown in FIG.
  • the heating element 14 is energized and generates heat.
  • the protection element 10 has the fuse element 17 incorporated on the current path of the battery pack 80 melted by the heat generated by the heating element 14, and the molten conductor of the fuse element 17 becomes melted.
  • the fuse element 17 is blown by being drawn to the heating element lead electrode 16 and the first and second electrodes 12 and 13 having high wettability. As a result, as shown in FIG.
  • the protective element 10 surely melts the space between the first electrode 12 and the heating element extraction electrode 16 and the second electrode 13 (FIG. 13B), The current path of the battery pack 80 can be cut off. Further, when the fuse element 17 is melted, power supply to the heating element 14 is also stopped.
  • the protection element 10 of the present invention is not limited to use in a battery pack of a lithium ion secondary battery, and can of course be applied to various uses that require interruption of a current path by an electric signal.
  • the fuse element 90 to which the present invention is applied includes an insulating substrate 11, first and second electrodes 12 and 13 formed on both ends of the insulating substrate 11, both ends being first, A fuse element 17 connected to the second electrodes 12 and 13 and conducting between the first and second electrodes 12 and 13 is provided, and a cover member 18 for protecting the inside is mounted on the insulating substrate 11. .
  • the fuse element 90 forms an element housing by the first and second electrodes 12 and 13 formed on the insulating substrate 11 and the cover member 18, and the fuse element 17 is connected to the component members on the element casing side.
  • the elastic member 20 is interposed therebetween and fixed.
  • the fuse element 17 is connected to the first and second electrodes 12 and 13 via the elastic member 20.
  • the elastic member 20 can connect the fuse element 17 on the first and second electrodes 12 and 13 in a conductive manner by forming the conductive layer 20a with a bonding material such as solder.
  • the elastic member 20 is interposed between the first and second electrodes 12 and 13 on the element housing side and the fuse element 17, so that the ambient temperature changes and the fuse element 17 expands or Even when contracted, the stress between the first and second electrodes 12 and 13 and the fuse element 17 can be absorbed and relaxed, and the first and second electrodes 12 and 13 and the fuse element 17 are broken. Can be prevented.
  • Such a fuse element 90 has a circuit configuration shown in FIG.
  • the fuse element 90 is mounted on the external circuit via the first and second external connection electrodes 12a and 13a, and is incorporated in the current path of the external circuit.
  • the fuse element 90 is not melted by self-heating while a predetermined rated current flows through the fuse element 17.
  • the fuse element 90 cuts off the current path of the external circuit by disconnecting the first and second electrodes 12 and 13 by fusing the fuse element 17 by self-heating when an overcurrent exceeding the rating is applied. (FIG. 16B).
  • the fuse element may be provided with an elastic member 20 on the insulating substrate 11 as shown in FIG.
  • the fuse element 91 shown in FIG. 17 is provided with an elastic member 20 on the insulating substrate 11 in place of the first and second electrodes 12 and 13, whereby the first electrode 12 and the second electrode 12 of the fuse element 17 are provided.
  • the elastic member 20 is connected to the fusing part 17 a between the electrodes 13.
  • the fusing part 17 a of the fuse element 17 refers to a fusing point in the fuse element 17 connected across the first and second electrodes 12 and 13, specifically, the first electrode 12 and the second electrode 13.
  • the fuse element 17 is joined to the first and second electrodes 12, 13 by the connecting solder 21, so that the portions that expand and contract are not fixed to these electrodes 12, 13. Since it becomes the fusing part 17a, by providing the elastic member 20 in the fusing part 17a, the stress between the fuse element 17 and the element housing can be effectively absorbed and relaxed.
  • the fuse element 17 may be joined by providing the elastic member 20 at one or more of the first and second electrodes 12 and 13.
  • the fuse element may be provided with an elastic member 20 on the cover member 18.
  • the fuse element 17 is joined to the first and second electrodes 12 and 13 by the connecting solder 21 and is electrically connected.
  • the elastic member 20 is joined to the fuse element 17 and the cover member 18.
  • the elastic member 20 provided on the cover member 18 does not necessarily have conductivity.
  • the elastic member 20 is interposed between the fuse element 17 and the cover member 18 that is a component member on the element housing side, so that the stress between the fuse element 17 and the element housing side is affected by the cover member 18. Absorbed and relaxed by the elastic member 20 that is moved to the side and connected to the cover member 18.
  • the elastic member 20 may be provided also on the insulating substrate 11, and both surfaces of the fuse element 17 may be sandwiched between the elastic members 20.
  • the fuse element 92 can effectively absorb and relieve stress between the fuse element 17 and the element housing side on both the insulating substrate 11 side and the cover member 18 side.
  • the fuse element 92 is provided with the elastic member 20 at one or more locations between the first and second electrodes 12, 13 and the insulating substrate 11 and the fusing part 17a.
  • the both sides of the element 17 may be sandwiched between the elastic members 20.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Fuses (AREA)

Abstract

L'invention a pour but de pourvoir à un élément de protection dans lequel une contrainte qui croît avec l'accroissement de taille d'un élément fusible est atténuée, et des caractéristiques de fusion stables peuvent être maintenues même si la température ambiante change. La présente invention comprend : une première électrode (12) et une seconde électrode (13) ; un élément fusible (17) connecté entre les première et seconde électrodes (12, 13) ; et un boîtier qui supporte l'élément fusible (17). L'élément fusible (17) est fixé en ayant un élément élastique (20) entre l'élément fusible et un élément de configuration côté boîtier.
PCT/JP2016/063832 2015-05-28 2016-05-10 Élément de protection et élément fusible WO2016190078A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1020177032536A KR102077450B1 (ko) 2015-05-28 2016-05-10 보호 소자, 퓨즈 소자
CN201680027404.7A CN107533935B (zh) 2015-05-28 2016-05-10 保护器件和熔丝器件

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015109098A JP6659239B2 (ja) 2015-05-28 2015-05-28 保護素子、ヒューズ素子
JP2015-109098 2015-05-28

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WO2016190078A1 true WO2016190078A1 (fr) 2016-12-01

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JP (1) JP6659239B2 (fr)
KR (1) KR102077450B1 (fr)
CN (1) CN107533935B (fr)
TW (1) TWI715574B (fr)
WO (1) WO2016190078A1 (fr)

Cited By (1)

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WO2019100382A1 (fr) * 2017-11-27 2019-05-31 功得电子工业股份有限公司 Structure de fixation de ligne fusible de fusible

Families Citing this family (3)

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Publication number Priority date Publication date Assignee Title
JP7010706B2 (ja) * 2018-01-10 2022-01-26 デクセリアルズ株式会社 ヒューズ素子
US20230037262A1 (en) * 2019-11-21 2023-02-02 Littelfuse, Inc. Circuit protection device with ptc device and backup fuse
JP2022142545A (ja) * 2021-03-16 2022-09-30 デクセリアルズ株式会社 保護素子及びバッテリパック

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JPS63186038U (fr) * 1987-05-22 1988-11-29
JPH06314538A (ja) * 1993-04-30 1994-11-08 Koa Corp 回路保護用素子
JPH0917303A (ja) * 1995-06-30 1997-01-17 Uchihashi Estec Co Ltd 平型温度ヒュ−ズ
WO2013146889A1 (fr) * 2012-03-29 2013-10-03 デクセリアルズ株式会社 Élément de protection
JP2014130684A (ja) * 2012-12-28 2014-07-10 Koa Corp 小型電流ヒューズの製造方法

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JP6659239B2 (ja) 2020-03-04
TWI715574B (zh) 2021-01-11
CN107533935B (zh) 2019-11-26
CN107533935A (zh) 2018-01-02
KR20170133512A (ko) 2017-12-05
TW201707037A (zh) 2017-02-16
KR102077450B1 (ko) 2020-02-14
JP2016225090A (ja) 2016-12-28

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