WO2020084739A1 - Circuit d'accumulateur et son procédé de production - Google Patents

Circuit d'accumulateur et son procédé de production Download PDF

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Publication number
WO2020084739A1
WO2020084739A1 PCT/JP2018/039725 JP2018039725W WO2020084739A1 WO 2020084739 A1 WO2020084739 A1 WO 2020084739A1 JP 2018039725 W JP2018039725 W JP 2018039725W WO 2020084739 A1 WO2020084739 A1 WO 2020084739A1
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WO
WIPO (PCT)
Prior art keywords
secondary battery
terminal
battery circuit
plating layer
breaker
Prior art date
Application number
PCT/JP2018/039725
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English (en)
Japanese (ja)
Inventor
高博 公文
Original Assignee
ボーンズ株式会社
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 ボーンズ株式会社 filed Critical ボーンズ株式会社
Priority to CN201880097976.1A priority Critical patent/CN112753086B/zh
Priority to PCT/JP2018/039725 priority patent/WO2020084739A1/fr
Publication of WO2020084739A1 publication Critical patent/WO2020084739A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • 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
    • H01H37/54—Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting

Definitions

  • the present invention relates to a secondary battery circuit including a breaker suitable for use in a DC circuit of an electric device.
  • breakers have been used as protective devices for secondary batteries and motors of various electric devices.
  • the breaker operates when the temperature of the rechargeable battery during charging / discharging rises excessively, or when an abnormality occurs, such as when an overcurrent flows through a motor or the like installed in equipment such as automobiles and home appliances. Shut off the current to protect the secondary battery and motor.
  • the breaker used as such a protection device operates accurately following a temperature change (has good temperature characteristics) and has a stable resistance value when energized in order to ensure the safety of the device. Required to be present.
  • Patent Document 1 discloses a breaker to which a bimetal is applied as a heat responsive element.
  • a bimetal is an element that is formed by laminating two types of plate-shaped metal materials having different thermal expansion coefficients, and changes the shape according to the temperature change to control the conduction state of the contacts.
  • parts such as a fixed piece, a movable piece, a thermoresponsive element, and a PTC thermistor are housed in a case, and terminals of the fixed piece and the movable piece protrude from the case, and Used by connecting to the secondary battery circuit.
  • the breaker when used as a protective device for a secondary battery or the like that is installed in an electric device such as a notebook personal computer, a tablet type personal digital assistant, or a thin multifunctional mobile phone called a smartphone, the above-described case has occurred.
  • miniaturization is required.
  • users are strongly interested in downsizing (thinning), and devices newly released by various companies are designed to be small in size in order to secure superiority in design. The tendency to be done is remarkable.
  • the fixed piece and the movable piece are made of a metal having excellent conductivity, for example, a metal containing copper as a main component.
  • the terminals provided on the fixed piece and the movable piece are usually joined by welding to the metal piece (tab lead) that constitutes the secondary battery circuit.
  • the metal piece is comprised, for example as a main component of nickel.
  • the metal piece made of nickel which has a lower conductivity than the fixed piece and the movable piece, has a large resistance value, the resistance value of the entire secondary battery circuit increases.
  • the present invention has been made in order to solve the above problems, and its main object is to provide a secondary battery circuit that can easily reduce the resistance value of the entire circuit.
  • the first aspect of the present invention relates to a secondary battery having an electricity storage cell, a pair of electrodes exposed to the outside of the electricity storage cell, a load driven by the secondary battery, and a load between the secondary battery and the load.
  • a secondary battery circuit including a breaker connected in series, the breaker including a first terminal directly connected to a positive electrode of the secondary battery, a fixed contact, and an elastic portion that elastically deforms. And a movable piece that has a movable contact at one end of the elastic portion, and presses the movable contact against the fixed contact to make contact with the movable contact so that the state of the movable piece is changed by the deformation.
  • thermo-responsive element that transitions from a conducting state in which the movable contact contacts the fixed contact to a shut-off state in which the movable contact separates from the fixed contact, and the fixed contact, the movable piece, and the To accommodate the thermo-responsive element And a case, wherein the positive electrode and the first terminal, characterized in that it is laser-welded.
  • a first plating layer that absorbs and melts the light is formed on a first surface irradiated with the light used for the laser welding of the first terminal. Is desirable.
  • the first plating layer is locally formed on a part of the first surface.
  • the second surface of the first terminal that is welded to the positive electrode is mainly made of a metal that has a greater ionization tendency than the first terminal and a smaller ionization tendency than the positive electrode. It is desirable that the second plating layer as a component is formed.
  • the second plating layer is locally formed on a part of the second surface.
  • the first plating layer and the second plating layer are composed mainly of nickel, tin or chromium.
  • the secondary battery circuit according to the present invention includes a metal piece that connects the breaker and the load, the breaker includes a second terminal connected to the metal piece, and the metal piece and the second terminal. Is preferably laser welded.
  • a third plating layer that absorbs and melts the light is formed on a third surface of the second terminal that is irradiated with the light.
  • the third plating layer is locally formed on a part of the third surface.
  • the third plating layer is composed mainly of nickel, tin or chromium.
  • a second aspect of the present invention is to connect a storage battery, a secondary battery having a pair of electrodes exposed to the outside of the storage cell, a load driven by the storage battery, and a positive electrode of the storage battery.
  • a secondary terminal a fixed contact, an elastic portion that elastically deforms, a movable piece having a movable contact at one end of the elastic portion, and a thermal responsive element that deforms with temperature change.
  • a method for manufacturing a secondary battery circuit comprising: a breaker connected in series between a load and a load, wherein the fixed contact, the movable piece, and the present invention is characterized by including an assembling step of assembling the breaker by housing the heat responsive element in a case and a welding step of laser welding the positive electrode and the first terminal.
  • a first surface irradiated with light used in the laser welding of the first terminal absorbs and melts the light. It is preferable that the first plating step of forming the plating layer is performed.
  • the second surface of the first terminal welded to the positive electrode has a greater ionization tendency than the first terminal, Also, it is desirable that the second plating step of forming the second plating layer containing a metal having a low ionization tendency as a main component is performed.
  • the fixing contact and the second terminal connected to a metal piece provided between the load and the fixed contact are exposed. It is preferable that the movable piece and the heat responsive element are housed in the case, and the welding step includes a step of laser welding the metal piece and the second terminal.
  • a third plating layer that absorbs and melts the light is formed on a third surface of the second terminal irradiated with the light. It is desirable that the third plating step be performed.
  • the secondary battery circuit of the first invention includes a storage cell, a secondary battery, a load, and a breaker connected in series between the secondary battery and the load.
  • the breaker used in the secondary battery circuit includes a first terminal directly connected to the positive electrode of the secondary battery, a fixed contact, a movable piece having an elastic portion and a movable contact, and is deformed with a temperature change.
  • the positive electrode and the first terminal are laser-welded. As a result, the nickel metal piece disposed between the positive electrode and the first terminal of the secondary battery in the conventional secondary battery circuit becomes unnecessary, and the resistance value of the entire secondary battery circuit can be easily reduced. Is possible. Further, the secondary battery circuit is simplified, and the cost can be easily reduced.
  • the second invention is a method for manufacturing a secondary battery circuit including a storage cell, a secondary battery, a load, and a breaker connected in series between the secondary battery and the load.
  • the breaker used in the present manufacturing method includes a first terminal directly connected to the positive electrode of the secondary battery, a fixed contact, a movable piece having an elastic portion and a movable contact, and a thermal reaction that deforms with temperature change.
  • the positive electrode and the first terminal are laser-welded.
  • the nickel metal piece disposed between the positive electrode and the first terminal of the secondary battery in the conventional secondary battery circuit becomes unnecessary, and the resistance value of the entire secondary battery circuit can be easily reduced. Is possible. Further, the secondary battery circuit is simplified, and the cost can be easily reduced.
  • FIG. 3 is a perspective view before assembly showing a schematic configuration of a breaker used for the secondary battery pack.
  • Sectional drawing which shows the said breaker in a normal charge or discharge state.
  • Sectional drawing which shows the said breaker at the time of an overcharged state or an abnormality.
  • Sectional drawing which shows the structure of the said breaker and its periphery.
  • Sectional drawing which shows the modification of the said breaker, and the structure of the periphery part.
  • the flowchart which shows the manufacturing method of the secondary battery circuit of this 2nd invention.
  • the side view of the metal plate which shows a plating process.
  • FIG. 1 shows a secondary battery circuit 500 in which a breaker 1 according to an embodiment of the present invention is used.
  • the secondary battery circuit 500 is a DC circuit including the breaker 1, the secondary battery 501, and the load 502.
  • the load 502 is driven by the secondary battery 501.
  • the breaker 1 is arranged between the secondary battery 501 and the load 502.
  • the secondary battery 501, the breaker 1, and the load 502 are connected in series.
  • FIG. 2 shows a secondary battery pack 550 that constitutes at least a part of the secondary battery circuit 500.
  • the secondary battery pack 550 has a secondary battery 501, a breaker 1, and a circuit board 503.
  • the load 502 of the secondary battery circuit 500 is mounted on the circuit board 503 or outside the circuit board 503.
  • the secondary battery 501 has a storage cell 510 that stores electric charge, a positive electrode 511 exposed to the outside of the storage cell 510, and a negative electrode 512.
  • the positive electrode 511 is composed of, for example, a metal piece containing aluminum as a main component.
  • the negative electrode 512 is composed of, for example, a metal piece containing copper as a main component.
  • the positive electrode 511 and the negative electrode 512 form a pair of electrodes.
  • circuit board 503 an FPC (flexible printed circuit board) or the like is applied in addition to a general PCB (printed circuit board).
  • the breaker 1 is mounted between the positive electrode 511 of the secondary battery 501 and the circuit board 503.
  • the negative electrode 512 of the secondary battery 501 is connected to the circuit board 503.
  • the secondary battery circuit 500 including the positive electrode 511, the breaker 1, the circuit board 503, the load 502, and the negative electrode 512 is configured.
  • the breaker 1 is mounted on an electric device or the like and protects the electric device from excessive temperature rise or overcurrent.
  • the breaker 1 includes a fixed piece 2 having a fixed contact 21, a movable piece 4 having a movable contact 41 at its tip, a thermal responsive element 5 that deforms with a change in temperature, and a PTC (Positive Temperature Coefficient) thermistor 6.
  • the case 10 includes a case body (first case) 7, a lid member (second case) 8 mounted on the upper surface of the case body 7, and the like.
  • the fixing piece 2 is formed with a terminal 22 exposed from the case 10.
  • a terminal 42 is formed on the movable piece 4 exposed from the case 10.
  • the fixing piece 2 is formed, for example, by pressing a plate-shaped metal material containing copper as a main component (other than this, a metal plate of copper-titanium alloy, nickel silver, brass, etc.).
  • the fixing piece 2 is embedded in the case body 7 by insert molding and is housed in the case body 7 with the terminals 22 exposed to the outside of the case body 7.
  • the fixed contact 21 is formed at a position facing the movable contact 41 by clad, plating or coating of a material having good conductivity such as silver, nickel, nickel-silver alloy, copper-silver alloy, gold-silver alloy. It is exposed from a part of the opening 73a formed inside the case body 7.
  • the terminal 22 is formed at one end of the fixed piece 2.
  • the terminal 22 projects outward from the side wall at the edge of the case body 7.
  • the terminal 22 is electrically connected to the secondary battery 501.
  • a support portion 23 that supports the PTC thermistor 6 is formed on the other end side of the fixed piece 2.
  • the support portion 23 is exposed to the internal space of the case body 7 through an opening 73d formed inside the case body 7.
  • the PTC thermistor 6 is mounted on convex protrusions (doughs) 24 formed at three locations on the support portion 23 of the fixed piece 2 and supported by the protrusions 24.
  • the surface of the fixed piece 2 on which the fixed contact 21 is formed (that is, the upper surface in FIG. 3) is the A surface, and the opposite surface is the B surface, unless otherwise specified. is doing.
  • the direction from the fixed contact 21 to the movable contact 41 is defined as the first direction and the direction opposite to the first direction is defined as the second direction
  • the A surface faces the first direction
  • the B surface faces the second direction.
  • the movable piece 4 is formed into an arm shape symmetrical with respect to the center line in the longitudinal direction by pressing a plate-shaped metal material containing copper as a main component.
  • a movable contact 41 is formed at the tip of the movable piece 4 in the longitudinal direction.
  • the movable contact 41 is formed of, for example, a material similar to that of the fixed contact 21, and is joined to the tip end of the movable piece 4 by a method such as welding, clad, crimping, or the like.
  • a terminal 42 electrically connected to the secondary battery circuit 500 outside the breaker 1 is formed at the other end of the movable piece 4 in the longitudinal direction.
  • the terminal 42 projects outward from the side wall at the edge of the case body 7.
  • the movable piece 4 has a contact portion 43 and an elastic portion 44 between the movable contact 41 and the terminal 42.
  • the contact portion 43 contacts the case body 7 and the lid member 8 between the terminal 42 and the elastic portion 44.
  • the contact portion 43 has a protruding portion 43a that protrudes like a wing in the lateral direction of the movable piece 4. Since the protrusion 43a is provided, the contact portion 43 is sandwiched by the case body 7 and the lid member 8 in a wide and large area, and the movable piece 4 is firmly fixed to the case 10.
  • the elastic portion 44 extends from the contact portion 43 to the movable contact 41 side.
  • the movable piece 4 is cantilevered by the case 10 at the abutting portion 43 on the proximal end side of the elastic portion 44, and is elastically deformed in this state to be formed at the tip portion of the elastic portion 44.
  • the movable contact 41 that is present is pressed against the fixed contact 21 side and comes into contact with it, so that the fixed piece 2 and the movable piece 4 can be energized.
  • the movable piece 4 is curved or bent in the elastic portion 44 by press working.
  • the degree of bending or bending is not particularly limited as long as the thermoresponsive element 5 can be housed therein, and may be appropriately set in consideration of the elastic force at the reversal operation temperature and the normal rotation return temperature, the pressing force of the contacts, and the like.
  • a pair of protrusions 44 a and 44 b is formed on the surface B of the elastic portion 44 so as to face the thermoresponsive element 5.
  • the protrusion 44a projects toward the thermoresponsive element 5 at the base end side and contacts the thermoresponsive element 5 in a blocked state.
  • the protrusion 44b projects toward the thermoresponsive element 5 on the tip side (that is, the movable contact 41 side) of the protrusion 44a, and contacts the thermoresponsive element 5 in a blocked state.
  • the thermal responsive element 5 is deformed by overheating, the thermal responsive element 5 contacts the protrusions 44a and 44b, the deformation of the thermal responsive element 5 is transmitted to the elastic portion 44 via the protrusions 44a and 44b, and the movable piece 4 moves.
  • the tip is pushed up (see Fig. 5).
  • the heat responsive element 5 shifts the state of the movable piece 4 from a conductive state in which the movable contact 41 contacts the fixed contact 21 to a cutoff state in which the movable contact 41 is separated from the fixed contact 21.
  • the thermal response element 5 has an initial shape in which the cross section is curved in an arc shape, and is formed in a plate shape by stacking thin plate materials having different thermal expansion coefficients. When the operating temperature is reached due to overheating, the curved shape of the thermal responsive element 5 reversely warps with snap motion, and is restored when the temperature falls below the return temperature due to cooling.
  • the initial shape of the heat responsive element 5 can be formed by pressing.
  • thermoresponsive element 5 are not particularly limited as long as the elastic portion 44 of the movable piece 4 is pushed up by the backward warping operation of the thermoresponsive element 5 at the desired temperature and returned to its original state by the elastic force of the elastic portion 44.
  • a rectangular shape is desirable from the viewpoint of productivity and the efficiency of reverse warping operation.
  • thermoresponsive element 5 As the material of the heat responsive element 5, two kinds of plate-shaped metal materials, which are made of various alloys such as nickel silver, brass and stainless steel and have different coefficients of thermal expansion, are laminated and used in combination according to the required conditions. To be done.
  • a material of the thermoresponsive element 5 that can obtain a stable operating temperature and a return temperature it is desirable to combine a copper-nickel-manganese alloy on the high expansion side and an iron-nickel alloy on the low expansion side.
  • a material in which an iron-nickel-chromium alloy is combined on the high expansion side and an iron-nickel alloy is combined on the low expansion side can be mentioned.
  • a material in which an iron-nickel-chromium alloy is combined on the high expansion side and an iron-nickel-cobalt alloy is combined on the low expansion side can be mentioned.
  • the PTC thermistor 6 makes the fixed piece 2 and the movable piece 4 electrically conductive when the movable piece 4 is in the cutoff state.
  • the PTC thermistor 6 is arranged between the fixed piece 2 and the thermoresponsive element 5. That is, the support portion 23 of the fixed piece 2 is located immediately below the thermoresponsive element 5 with the PTC thermistor 6 interposed therebetween.
  • the type can be selected according to the needs of the operating current, the operating voltage, the operating temperature, the return temperature, The material and shape are not particularly limited as long as these characteristics are not impaired.
  • a ceramic sintered body containing barium titanate, strontium titanate or calcium titanate is used.
  • so-called polymer PTC in which conductive particles such as carbon are contained in polymer may be used.
  • the case body 7 and the lid member 8 constituting the case 10 are made of a thermoplastic resin such as flame-retardant polyamide, polyphenylene sulfide (PPS), liquid crystal polymer (LCP), polybutylene terephthalate (PBT), etc., which has excellent heat resistance. Has been done. A material other than the resin may be applied as long as the characteristics equal to or higher than those of the resin described above can be obtained.
  • a thermoplastic resin such as flame-retardant polyamide, polyphenylene sulfide (PPS), liquid crystal polymer (LCP), polybutylene terephthalate (PBT), etc.
  • the case main body 7 is formed with a recess 73 which is an internal space for housing the movable piece 4, the thermoresponsive element 5, the PTC thermistor 6, and the like.
  • the recess 73 has openings 73a and 73b for accommodating the movable piece 4, an opening 73c for accommodating the movable piece 4 and the thermoresponsive element 5, an opening 73d for accommodating the PTC thermistor 6, and the like. ing. It should be noted that the movable piece 4 incorporated in the case body 7 and the end edges of the thermal responsive element 5 are brought into contact with each other by a frame formed inside the recess 73, and are guided when the thermal responsive element 5 warps backward.
  • a metal plate containing copper or the like as a main component or a metal plate such as stainless steel may be embedded in the lid member 8 by insert molding.
  • the metal plate appropriately contacts the surface A of the movable piece 4 to restrict the movement of the movable piece 4, and contributes to downsizing of the breaker 1 while increasing the rigidity and strength of the lid member 8 and thus the case 10 as a housing. To do.
  • the openings 73a and 73b of the case body 7 accommodating the fixed piece 2 (fixed contact 21), the movable piece 4 (movable contact 41, elastic portion 44), the thermoresponsive element 5, the PTC thermistor 6 and the like. , 73c, etc., the lid member 8 is attached to the case body 7.
  • the case body 7 and the lid member 8 are joined by ultrasonic welding, for example.
  • the breaker 1 is assembled with the terminals 22 and 42 exposed.
  • FIG. 4 shows the operation of the breaker 1 in a normal charging or discharging state.
  • the thermoresponsive element 5 maintains the initial shape before the reverse warp.
  • the thermal responsive element 5 may be separated from the protrusions 44a and 44b of the movable piece 4 in the conductive state. As a result, the contact pressure between the movable contact 41 and the fixed contact 21 is increased, and the contact resistance between them is reduced.
  • FIG. 5 shows the operation of the breaker 1 in an overcharged state or an abnormality.
  • the thermal responsive element 5 that has reached the operating temperature reversely warps and contacts the elastic portion 44 of the movable piece 4, and the elastic portion 44 is pushed up and the fixed contact 21 and the movable contact 41 are connected. Are separated. At this time, the current flowing between the fixed contact 21 and the movable contact 41 is cut off.
  • the thermoresponsive element 5 comes into contact with the movable piece 4, and a slight leakage current flows through the thermoresponsive element 5 and the PTC thermistor 6.
  • the PTC thermistor 6 brings the fixed piece 2 and the movable piece 4 into conduction via the thermal response element 5 that shifts the movable piece 4 to the cutoff state.
  • the PTC thermistor 6 continues to generate heat as long as such a leakage current flows, and dramatically increases the resistance value while maintaining the thermoresponsive element 5 in the reverse warped state, so that the current flows through the path between the fixed contact 21 and the movable contact 41. Does not flow, and there is only the above-mentioned slight leakage current (constituting a self-holding circuit). This leakage current can be used for other functions of the safety device.
  • the terminal 22 of the breaker 1 is directly connected to the positive electrode 511 of the secondary battery 501. “Directly connected” means that the terminal 22 is connected to the positive electrode 511 without a metal piece such as a tab lead.
  • the terminal 22 and the positive electrode 511 are connected by laser welding.
  • Laser welding is a welding method in which laser light is irradiated and the energy is used to melt and join the metal.
  • a YAG laser having a wavelength of 1064 nm is used, and laser light is emitted from the front to the back in FIG. 2 (from the upper side to the lower side in FIG. 6 described later).
  • the positive electrode 511 and the terminal 22 are laser-welded, the nickel metal piece disposed between the positive electrode and the first terminal of the secondary battery in the conventional DC circuit is unnecessary, and the secondary battery circuit is eliminated. It is possible to easily reduce the resistance value of the entire 500. Further, the secondary battery circuit 500 is simplified, and the cost can be easily reduced.
  • FIG. 6 shows the configuration of the breaker 1 and its peripheral portion.
  • a plating layer 25 that absorbs and melts the laser light is formed on the surface 22a of the terminal 22 that is irradiated with the laser light (in the present embodiment, the surface A).
  • the plating layer 25 is made of nickel, tin or chromium or an alloy containing them as a main component.
  • the melting of the plated layer 25 triggers the terminal 22 and the positive electrode 511 of the secondary battery 501 to sequentially melt, and the terminal 22 and the positive electrode 511 are well welded. Therefore, the contact resistance between the positive electrode 511 and the terminal 22 can be easily reduced, and the resistance value of the entire secondary battery circuit 500 can be further reduced.
  • the plating layer 25 may be formed on the surface 22b (the above-mentioned B surface) opposite to the surface 22a. In this case, for example, it becomes possible to connect the positive electrode 511 and the terminal 22 by reversing the top and bottom of the breaker 1 with respect to the secondary battery 501.
  • a plating layer 26 is formed on the surface 22 b of the terminal 22 that is welded to the positive electrode 511.
  • the plating layer 26 is mainly composed of a metal having a greater ionization tendency than the terminal 22 and a smaller ionization tendency than the positive electrode 511.
  • the plating layer 26 is made of nickel, tin or chromium or an alloy containing them as a main component. Thereby, corrosion between the terminal 22 and the positive electrode 511 is suppressed.
  • the plating layer 25 is preferably formed locally on a part of the surface 22a of the terminal 22.
  • the plating layer 25 is formed on the area of the surface 22a excluding the vicinity of the side wall of the case 10. Thereby, when the terminal 22 is deformed, the stress applied to the plating layer 25 is reduced, and damage (for example, crack) of the plating layer 25 can be suppressed.
  • the plated layer 25 is formed in the area excluding the bent portion and the vicinity thereof. As a result, damage to the plating layer 25 when forming the bent portion can be suppressed.
  • the plated layer 26 is locally formed on a part of the surface 22b of the terminal 22.
  • a metal piece 520 is provided between the breaker 1 and the circuit board 503, that is, between the breaker 1 and the load 502.
  • the metal piece 520 may be a part of the metal foil formed on the PCB or FPC.
  • the metal piece 520 is made of, for example, a metal whose main component is copper having excellent conductivity.
  • the terminal 42 of the breaker 1 is connected to the metal piece 520 by laser welding.
  • a plating layer 45 that absorbs and melts the laser light is formed on the surface 42a of the terminal 42 that is irradiated with the laser light (in the present embodiment, the surface A).
  • the plating layer 45 is made of nickel, tin or chromium or an alloy containing them as a main component. As a result, the plating layer 45 is melted and the terminal 42 and the metal piece 520 are sequentially melted, and the terminal 42 and the metal piece 520 are well welded. Therefore, the contact resistance between the terminal 42 and the metal piece 520 is easily reduced, and the resistance value of the entire secondary battery circuit 500 can be further reduced.
  • the plating layer 45 may be formed on the surface 42b (the above-mentioned B surface) opposite to the surface 42a. In this case, the metal piece 520 and the terminal 42 can be connected by reversing the top and bottom of the breaker 1 with respect to the secondary battery 501.
  • the plating layer 45 is preferably formed locally on a part of the surface 42 a of the terminal 42.
  • the plating layer 45 is formed in the area of the surface 42a excluding the vicinity of the side wall of the case 10. Thereby, when the terminal 42 is deformed, the stress applied to the plating layer 45 is reduced, and the damage of the plating layer 45 can be suppressed.
  • the plating layer is locally formed on a part of the surface 42b of the terminal 42.
  • the bent portion 47 may be formed on the terminal 42 by pressing or the like.
  • the plated layer 45 it is desirable that the plated layer 45 be formed in a region other than the bent portion 47 and its vicinity. This can prevent damage to the plating layer 45 when forming the bent portion 47.
  • the terminals 22 and 42 extend from the side wall of the case 10 in the longitudinal direction of the movable piece 4 and project therefrom.
  • the protruding length L1 of the terminal 22 from the case 10 may be different from the protruding length L2 of the terminal 42 from the case 10.
  • the protruding length L1 of the terminal 22 is set to be larger than the protruding length L2 of the terminal 42.
  • the contact area between the terminal 42 and the metal piece 520 is enlarged, and the contact resistance between them can be easily reduced. Is possible.
  • the length L3 of the plating layer 25 and the length L4 of the plating layer 45 may be different.
  • the length L3 is the length of the plating layer 25 in the direction in which the terminal 22 projects from the case 10 (the same applies to the length L4).
  • the length L3 of the plating layer 25 is set to be larger than the length L4 of the plating layer 45. Thereby, the terminal 22 and the positive electrode 511 are well welded over a wide area.
  • the terminal 42 and the metal piece 520 are welded well in a wide area.
  • the corrosion between the terminal 22 and the positive electrode 511 is suppressed.
  • the metal layer formed by such a technique as the clad has a large thickness dimension, when a metal having a low conductivity is applied, the resistance value between the positive electrode 511 and the terminal 22 becomes large, and The voltage drop in the layer is large.
  • the plating layer 26 formed on the surface 22b of the terminal 22 has a smaller thickness dimension than the metal layer formed by a method such as a clad. Therefore, the resistance value between the positive electrode 511 and the terminal 22 is suppressed even when the plating layer 26 is made of a metal having a conductivity lower than that of the metal forming the fixing piece 2.
  • the present invention relates to a secondary battery 501 having at least a storage cell 510, a pair of electrodes exposed to the outside of the storage cell 510, a load 502 driven by the secondary battery 501, and a secondary battery 501.
  • a breaker 1 including a breaker 1 connected in series between a load 502 and a load 502, wherein the breaker 1 is fixed to a terminal 22 directly connected to a positive electrode 511 of a rechargeable battery 501.
  • the thermal responsive element 5 that shifts the state of the movable piece 4 from the conductive state in which the movable contact 41 contacts the fixed contact 21 to the cutoff state in which the movable contact 41 is separated from the fixed contact 21 and the terminal 22 are In a state of out, the fixed contact 21, and a case 10 for housing the movable piece 4 and the thermal actuator element 5, the positive electrode 511 and the terminal 22 need only be laser welded.
  • the breaker 1 used in the secondary battery circuit 500 of the present embodiment has a self-holding circuit by the PTC thermistor 6, but the configuration without such a configuration is also applicable.
  • the resistance value of the entire DC circuit can be easily reduced.
  • the movable piece 4 may be formed of a laminated metal such as bimetal or trimetal so that the movable piece 4 and the thermoresponsive element 5 are integrally formed.
  • the structure of the breaker is simplified, and the size can be further reduced.
  • the movable piece 4 of the present embodiment is integrally formed from the elastic portion 44 to the terminal 42, the invention is not limited to such a form, and is disclosed in, for example, JP-A-2017-37757.
  • the movable piece 4 in a form in which the movable arm on the movable contact 41 side and the terminal piece on the terminal 42 side are separated may be applied to the present invention.
  • the movable arm and the terminal piece may be fixed by welding or the like.
  • the terminal piece on the terminal 42 side may be insert-molded in the case body 7 together with the fixing piece 2 and the like.
  • the terminal 22 formed on the fixed piece 2 is the first terminal directly laser-welded to the positive electrode 511 of the secondary battery 501
  • the terminal 42 formed on the movable piece 4 is the metal piece 520.
  • a breaker 1 in the form of a second terminal to be laser-welded is described. Accordingly, the plating layer 25 formed on the surface 22a is the first plating layer and the plating layer 26 formed on the surface 22b is the second plating layer, and the plating layer formed on the surface 42a. 45 is the third plating layer.
  • FIG. 7 shows a configuration of a breaker 1A which is a modified example of the breaker 1 and its peripheral portion.
  • the terminal 42 formed on the movable piece 4 is the first terminal directly laser-welded to the positive electrode 511 of the secondary battery 501. May be.
  • the terminal 22 formed on the fixed piece 2 may be a second terminal laser-welded to the metal piece 520.
  • the plating layer 45 formed on the surface 42a is the first plating layer
  • the plating layer 46 formed on the surface 42b is the second plating layer
  • the plating layer 25 formed on the surface 22a is the second plating layer. It is the third plating layer.
  • the other configurations of the breaker 1A are the same as those of the breaker 1.
  • FIG. 8 is a flowchart showing a method for manufacturing the secondary battery circuit 500.
  • the method for manufacturing the secondary battery circuit 500 includes an assembling step S10 for assembling the breaker 1 and a welding step S20 for laser welding the positive electrode 511 of the secondary battery 501 and the terminal 22 of the breaker 1.
  • the fixed piece 2 including the fixed contact 21, the movable piece 4, and the thermoresponsive element 5 are housed in the case 10 with the terminal 22 exposed.
  • the welding step S20 laser light is emitted from the terminal 22 side in a state where the terminal 22 is placed on the positive electrode 511, and the positive electrode 511 and the terminal 22 are laser-welded.
  • the metal piece made of nickel which is arranged between the positive electrode and the terminal of the secondary battery in the conventional secondary battery circuit, becomes unnecessary, and the resistance value of the entire secondary battery circuit 500 can be easily reduced. It will be possible. Further, the secondary battery circuit 500 is simplified, and the cost can be easily reduced.
  • the plating step S5 includes a plating step S1 for forming the plating layer 25 on the surface 22a of the terminal 22.
  • FIG. 9 shows the plating step S5.
  • the plating layer 25 is formed on the one surface 200a of the sheet-shaped metal plate (original material) 200.
  • a pressing step (not shown)
  • the metal plate 200 is punched out to form the fixing piece 2 including the terminal 22.
  • the plating layer 25 may be formed on the surface 22a of the terminal 22 and the plating process S1 may be performed.
  • the plating step S1 may be performed after the assembly step S10.
  • the plating step S5 may include a plating step S2 for forming the plating layer 26 on the surface 22b of the terminal 22.
  • a plating step S2 for forming the plating layer 26 on the surface 22b of the terminal 22.
  • the plating step S2 is executed, for example, after the plating step S1.
  • the plating step S2 may be performed simultaneously with the plating step S1.
  • the plating step S2 may be performed before the plating step S1.
  • the plating step S2 may be performed after the pressing step or after the assembling step S10.
  • the plating step S5 may include a plating step S3 for forming the plating layer 45 on the surface 42a of the terminal 42.
  • a plating step S3 for forming the plating layer 45 on the surface 42a of the terminal 42.
  • the plating step S3 is performed, for example, before or after the plating step S1, or simultaneously with the plating step S1.
  • the plating step S3 may be performed after the pressing step or after the assembling step S10. In this case, it is desirable that the plating step S3 be performed at the same time as the plating step S1.
  • the present invention relates to a secondary battery 501 having at least a storage cell 510, a pair of electrodes exposed to the outside of the storage cell 510, a load 502 driven by the secondary battery 501, and a secondary battery 501.
  • Terminal 22 connected to the positive electrode 511, the fixed contact 21, the elastic portion 44 that elastically deforms, and the movable piece 4 that has the movable contact 41 at one end of the elastic portion 44, and the thermal response that deforms with temperature change.
  • a fixed contact 21, a movable piece 4, and a thermoresponsive element 5 are housed in a case 10 to assemble the breaker 1, and an assembling step S10 and a welding step S20 for laser welding the positive electrode 511 and the terminal 22. It may be put.

Landscapes

  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Thermally Actuated Switches (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

Un circuit d'accumulateur comprend: un accumulateur ayant un élément de stockage d'énergie et une paire d'électrodes exposées à l'extérieur de l'élément de stockage d'énergie; une charge 502 entraînée par l'accumulateur 501; et un coupe-circuit 1 connecté en série entre l'accumulateur 501 et la charge 502. Le coupe-circuit 1 comprend: une borne 22 connectée en série à une électrode positive 511 dans l'accumulateur 501; un contact fixe 21; une pièce mobile 4 ayant une section élastique 44 qui se déforme élastiquement et un contact mobile 41 sur une extrémité de la section élastique 44, ladite pièce mobile 4 pressant le contact mobile 41 contre le contact fixe 21 pour entrer en contact avec celui-ci; un élément thermosensible 5 qui, par déformation conjointement avec un changement de température, déplace la pièce mobile 4 d'un état conducteur dans lequel le contact mobile 41 entre en contact avec le contact fixe 21 jusqu'à un état déconnecté dans lequel le contact mobile 41 se sépare du contact fixe 21; et un boîtier 10 pour loger le contact fixe 21, la pièce mobile 4, et l'élément thermosensible 5, dans un état dans lequel la borne 22 est exposée. L'électrode positive 511 et la borne 22 sont soudées par laser.
PCT/JP2018/039725 2018-10-25 2018-10-25 Circuit d'accumulateur et son procédé de production WO2020084739A1 (fr)

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CN201880097976.1A CN112753086B (zh) 2018-10-25 2018-10-25 二次电池电路及其制造方法
PCT/JP2018/039725 WO2020084739A1 (fr) 2018-10-25 2018-10-25 Circuit d'accumulateur et son procédé de production

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010093178A (ja) * 2008-10-10 2010-04-22 Panasonic Corp 電気化学キャパシタ及びその製造方法
JP2013084443A (ja) * 2011-10-07 2013-05-09 Otsuka Techno Kk パック電池
JP2014120302A (ja) * 2012-12-14 2014-06-30 Otsuka Techno Kk ブレーカ
JP2014164966A (ja) * 2013-02-24 2014-09-08 Furukawa Electric Co Ltd:The 端子の製造方法、その製造方法に用いる端子材、その製造方法により製造された端子、電線の終端接続構造体およびその製造方法、ならびに、端子用の銅または銅合金板材
JP2017098186A (ja) * 2015-11-27 2017-06-01 ボーンズ株式会社 ブレーカー並びにそれを備えた安全回路及び２次電池回路。

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100591432B1 (ko) * 2004-05-31 2006-06-22 삼성에스디아이 주식회사 이차전지
US9159985B2 (en) * 2011-05-27 2015-10-13 Ostuka Techno Corporation Circuit breaker and battery pack including the same
CN103999180B (zh) * 2011-12-22 2016-12-14 小松电子部品有限公司 断路器以及具备该断路器的安全电路和二次电池组
JP5355767B1 (ja) * 2012-11-26 2013-11-27 株式会社小松ライト製作所 ブレーカー及びそれを備えた安全回路並びに２次電池回路
CN105308709B (zh) * 2013-04-19 2018-02-09 泰科电子日本合同会社 保护装置
JP2016213121A (ja) * 2015-05-12 2016-12-15 株式会社小松ライト製作所 電流遮断装置並びにそれを用いた２次電池回路及び安全回路
JP6703004B2 (ja) * 2015-11-20 2020-06-03 ボーンズ株式会社 電子機器筐体、電子機器筐体の製造方法及びそれを備えたブレーカー

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010093178A (ja) * 2008-10-10 2010-04-22 Panasonic Corp 電気化学キャパシタ及びその製造方法
JP2013084443A (ja) * 2011-10-07 2013-05-09 Otsuka Techno Kk パック電池
JP2014120302A (ja) * 2012-12-14 2014-06-30 Otsuka Techno Kk ブレーカ
JP2014164966A (ja) * 2013-02-24 2014-09-08 Furukawa Electric Co Ltd:The 端子の製造方法、その製造方法に用いる端子材、その製造方法により製造された端子、電線の終端接続構造体およびその製造方法、ならびに、端子用の銅または銅合金板材
JP2017098186A (ja) * 2015-11-27 2017-06-01 ボーンズ株式会社 ブレーカー並びにそれを備えた安全回路及び２次電池回路。

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