WO2023084944A1 - ブレーカー、安全回路及び２次電池パック - Google Patents

ブレーカー、安全回路及び２次電池パック Download PDF

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Publication number
WO2023084944A1
WO2023084944A1 PCT/JP2022/036941 JP2022036941W WO2023084944A1 WO 2023084944 A1 WO2023084944 A1 WO 2023084944A1 JP 2022036941 W JP2022036941 W JP 2022036941W WO 2023084944 A1 WO2023084944 A1 WO 2023084944A1
Authority
WO
WIPO (PCT)
Prior art keywords
contact
movable piece
resin case
movable
fixed contact
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2022/036941
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
勝史 浪川
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bourns KK
Original Assignee
Bourns KK
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 Bourns KK filed Critical Bourns KK
Priority to US18/708,571 priority Critical patent/US20250006443A1/en
Priority to EP22892444.5A priority patent/EP4398281A4/en
Publication of WO2023084944A1 publication Critical patent/WO2023084944A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H01H37/04—Bases; Housings; Mountings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/50—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position
    • H01H1/504—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position by thermal means
    • 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
    • H01H37/46—Thermally-sensitive members actuated due to expansion or contraction of a solid
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/574—Devices or arrangements for the interruption of current
    • H01M50/581—Devices or arrangements for the interruption of current in response to temperature
    • 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
    • H01H37/5427—Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting encapsulated in sealed miniaturised housing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2200/00—Safety devices for primary or secondary batteries
    • H01M2200/10—Temperature sensitive devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2200/00—Safety devices for primary or secondary batteries
    • H01M2200/10—Temperature sensitive devices
    • H01M2200/106—PTC
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present invention relates to a small breaker or the like built into an electrical device or the like.
  • breakers have been used as protective devices (safety circuits) for secondary batteries, motors, heaters, etc. of various electrical devices (see Patent Document 1, for example).
  • Patent Document 1 discloses a breaker in which a case body and a lid member are ultrasonically welded to form a case.
  • the present invention has been devised in view of the actual situation as described above, and its main purpose is to provide a breaker capable of suppressing the generation of cutting powder when the case is welded.
  • the present invention comprises a fixed contact, an elastic portion that is elastically deformable, 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 fixed contact, and a movable piece that deforms with temperature changes.
  • a circuit breaker comprising: a first resin case having a housing recess for housing a thermally responsive element; and a second resin case fixed to the first resin case and covering the housing recess, wherein the second resin case comprises: The first resin case has an embedded portion that embeds a portion of the movable piece, and a first recess that is recessed in the thickness direction of the second resin case, and the first resin case has a first protrusion that is fitted into the first recess. have a part.
  • the first protrusion includes a first side surface perpendicular to the short direction of the movable piece and a second side surface perpendicular to the longitudinal direction of the movable piece.
  • the first resin case has a first slope formed on the outer side of the movable piece of the first protrusion in the width direction of the movable piece, It is desirable to have a second slope corresponding to the first slope.
  • the second slope is formed with a rib protruding toward the first resin case along the outer edge of the second resin case.
  • the rib is formed continuously from the second slope to the buried portion.
  • the first resin case has a second concave portion on the side of the fixed contact
  • the second resin case has a second convex portion that fits into the second concave portion. is desirable.
  • the first protrusion is arranged outside the accommodating recess in the longitudinal direction of the movable piece.
  • the second resin case includes a projecting portion projecting from the embedded portion toward the movable contact, and the first recess is formed in a width direction of the movable piece with respect to the projecting portion. It is desirable to form on both sides of the direction.
  • the present invention is a safety circuit for electrical equipment, comprising the breaker.
  • the present invention is a secondary battery pack including the breaker.
  • a part of the movable piece is embedded in the second resin case in the breaker of the present invention.
  • the movable piece is fixed at an accurate position with respect to the second resin case.
  • the first resin case has a first protrusion that fits into the first recess of the second resin case. Due to the fitting between the first concave portion and the first convex portion, displacement of the second resin case with respect to the first resin case during welding is suppressed. Therefore, the movable piece is accurately positioned with respect to the first resin case, and displacement of the movable piece due to vibration during welding is suppressed, thereby suppressing generation of cutting powder.
  • FIG. 4 is a cross-sectional view showing the breaker in normal charging or discharging state
  • FIG. 4 is a cross-sectional view showing the breaker in an overcharged state, an abnormal state, or the like
  • FIG. 4 is a perspective view showing a lid member in which movable pieces and cover pieces are embedded
  • the perspective view which shows the case main body in which the fixing piece was embed
  • the top view which shows the structure of the secondary battery pack provided with the said breaker of this invention.
  • a breaker according to one embodiment of the present invention will be described with reference to the drawings.
  • 1 to 3 show the construction of a breaker 1 manufactured according to the invention.
  • a breaker 1 is mounted on an electrical device or the like to protect the electrical 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 one end, a thermal responsive element 5 that deforms with temperature changes, and a PTC (Positive Temperature Coefficient) thermistor 6. , a fixed piece 2, a movable piece 4, a thermally responsive element 5 and a resin case 10 for accommodating the PTC thermistor 6, and the like.
  • the resin case 10 is composed of a case body (first resin case) 7, a lid member (second resin case) 8 attached to the upper surface of the case body 7, and the like.
  • the fixing piece 2 is formed, for example, by pressing a metal plate containing copper as a main component (other metal plates such as copper-titanium alloy, nickel silver, brass, etc.), and is inserted into the case body 7 by insert molding. Embedded.
  • a terminal 22 electrically connected to an external circuit is formed on one end of the fixed piece 2, and a support portion 23 for supporting the PTC thermistor 6 is formed on the other end.
  • the terminal 22 protrudes outside the case body 7 .
  • the PTC thermistor 6 is placed on and supported by three convex projections (dowels) 24 formed on the support portion 23 of the fixed piece 2 .
  • the fixed contact 21 is clad, plated, welded or coated with a highly conductive material such as silver, nickel, nickel-silver alloy, copper-silver alloy, gold-silver alloy, etc. at a position facing the movable contact 41. It is exposed from a part of the opening 73a formed inside the case main body 7. As shown in FIG. The terminal 22 protrudes outward from the edge of the case body 7 . The support portion 23 is exposed through an opening 73 d formed inside the case body 7 .
  • the surface of the fixed piece 2 on which the fixed contact 21 is formed (that is, the upper surface in FIG. 1) is the first surface, and the opposite surface is the second surface. is explained as The same applies to other parts such as the movable piece 4, the thermally responsive element 5, the PTC thermistor 6, the resin case 10, and the like.
  • 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 whose main component is copper or the like. A portion of the movable piece 4 (fixed portion 43 to be described later) is embedded in the lid member 8 by insert molding.
  • a movable contact 41 is formed at one end in the longitudinal direction of the movable piece 4 .
  • the movable contact 41 is made of, for example, the same material as the fixed contact 21, and is joined to one end of the movable piece 4 by welding, cladding, crimping, or the like.
  • a terminal 42 electrically connected to an external circuit is formed at the other end of the movable piece 4 .
  • the terminal 42 protrudes outward from the edge of the lid member 8 .
  • a fixing portion 43 embedded and fixed in the cover member 8 is provided between the movable contact 41 and the terminal 42 .
  • the fixing portion 43 is arranged on the terminal 42 side.
  • the movable piece 4 has an elastic portion 44 between the movable contact 41 and the fixed portion 43 .
  • the elastic portion 44 extends from the fixed portion 43 toward the movable contact 41 .
  • the movable piece 4 is cantilevered by the cover member 8 at the fixed portion 43 on the base end side of the elastic portion 44 .
  • the movable contact 41 formed at the tip portion is pressed toward the fixed contact 21 and comes into contact therewith, so that the fixed piece 2 and the movable piece 4 can be energized.
  • the movable piece 4 is desirably curved or bent at the elastic portion 44 by press working.
  • the degree of bending or bending is not particularly limited as long as the thermally responsive element 5 can be accommodated, and may be appropriately set in consideration of the elastic force at the operating temperature and return temperature, the pressing force of the contact, and the like.
  • a pair of protrusions (contact portions) 44 a and 44 b are formed on the second surface of the elastic portion 44 so as to face the thermal response element 5 .
  • the projections 44a, 44b and the thermal responsive element 5 are in contact with each other, and deformation of the thermal responsive element 5 is transmitted to the elastic portion 44 via the projections 44a, 44b (see FIGS. 1, 2 and 3).
  • the thermally responsive element 5 is arranged between the movable piece 4 and the PTC thermistor 6 . That is, the thermally responsive element 5 is placed on the first surface of the PTC thermistor 6, which will be described later.
  • the thermal response element 5 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 disconnected state in which the movable contact 41 is separated from the fixed contact 21 .
  • the thermally responsive element 5 is formed in a plate shape by stacking thin plate materials having different coefficients of thermal expansion, and has an initial shape with a cross section curved in an arc shape.
  • the curved shape of the thermally responsive element 5 is reversely warped with a snap motion, and is restored when the temperature drops below the normal rotation return temperature due to cooling.
  • the initial shape of the thermal response element 5 can be formed by pressing.
  • the material and shape of the thermally responsive element 5 are not particularly limited as long as the elastic portion 44 of the movable piece 4 is pushed up by the reverse warping deformation of the thermally responsive element 5 at a desired temperature and is restored by the elastic force of the elastic portion 44 .
  • a rectangular shape is desirable.
  • the material of the thermally responsive element 5 a laminate of two kinds of materials having different coefficients of thermal expansion made of various alloys such as nickel silver, brass, and stainless steel is used in combination according to the required conditions.
  • a material of the thermally responsive element 5 that can obtain a stable reverse operation temperature and normal rotation return temperature a combination of a copper-nickel-manganese alloy on the high expansion side and an iron-nickel alloy on the low expansion side is desirable.
  • a more desirable material is a combination of an iron-nickel-chromium alloy on the high expansion side and an iron-nickel alloy on the low expansion side.
  • a more desirable material is a combination of an iron-nickel-chromium alloy on the high expansion side and an iron-nickel-cobalt alloy on the low expansion side.
  • the PTC thermistor 6 electrically connects the fixed piece 2 and the movable piece 4 via the thermally responsive element 5 when the movable piece 4 is in the interrupted state.
  • a PTC thermistor 6 is arranged between the fixed piece 2 and the thermally responsive element 5 .
  • the support portion 23 of the fixed piece 2 is positioned directly below the thermal responsive element 5 with the PTC thermistor 6 interposed therebetween.
  • the type can be selected according to the needs such as the operating current, operating voltage, operating temperature, and recovery temperature.
  • the material and shape are not particularly limited as long as they do not impair these properties.
  • a ceramic sintered body containing barium titanate, strontium titanate, or calcium titanate is used.
  • a so-called polymer PTC in which conductive particles such as carbon are contained in a polymer may be used.
  • the case body 7 and lid member 8 that constitute the resin case 10 are made of thermoplastic resin such as flame-retardant polyamide, polyphenylene sulfide (PPS) with excellent heat resistance, liquid crystal polymer (LCP), and polybutylene terephthalate (PBT). molded.
  • a material other than the resin may be used as long as it can obtain properties equal to or greater than those of the resin described above.
  • a housing recess 73 which is an internal space for housing the fixed contact 21, the movable piece 4, the thermally responsive element 5, the PTC thermistor 6, and the like, is formed.
  • the housing recess 73 includes an opening 73a for housing the fixed contact 21 and the movable piece 4, an opening 73c for housing the movable piece 4 and the thermal responsive element 5, an opening 73d for housing the PTC thermistor 6, and the like. have.
  • the edges of the movable piece 4 and the thermally responsive element 5 incorporated in the case body 7 are brought into contact with the frame forming the housing recess 73, and are guided when the thermally responsive element 5 undergoes reverse warping deformation. That is, the accommodation recess 73 accommodates the movable piece 4 and the thermally responsive element 5 in a deformable manner.
  • the lid member 8 is configured to cover the accommodation recess 73 .
  • the lid member 8 may be configured to cover at least a portion of the accommodation recess 73 .
  • a cover piece 9 made of a metal plate containing copper or the like as a main component or stainless steel or the like is embedded in the lid member 8 by insert molding.
  • the cover piece 9 is embedded in the lid member 8 together with the fixed portion 43 of the movable piece 4 while being in contact with the first surface of the fixed portion 43 .
  • the cover piece 9 regulates the movement of the movable piece 4 and contributes to miniaturization of the breaker 1 while increasing the rigidity and strength of the lid member 8 and the resin case 10 as a housing.
  • the case body 7 and the lid member 8 are formed by injection molding using the above resin material. As already described, the fixed piece 2 is inserted into the case body 7 , and the movable piece 4 and the cover piece 9 are inserted into the lid member 8 .
  • the lid member 8 is attached to the case body 7 so as to cover the openings 73a and 73c of the case body 7 housing the fixed piece 2, the movable piece 4, the thermally responsive element 5, the PTC thermistor 6, and the like. is attached to the The housing recess 73 is covered with the lid member 8 .
  • the case main body 7 and the lid member 8 are joined by ultrasonic welding, for example. Thereby, the resin case 10 is formed.
  • FIG. 2 shows the operation of breaker 1 in normal charging or discharging conditions.
  • the thermal responsive element 5 maintains its initial shape before reverse warping.
  • the movable contact 41 is pressed toward the fixed contact 21 by the elastic portion 44 , the movable contact 41 and the fixed contact 21 come into contact with each other, and the movable contact 41 and the fixed piece 2 of the breaker 1 move through the elastic portion 44 of the movable piece 4 .
  • the strip 4 is brought into a conductive state.
  • the elastic portion 44 of the movable piece 4 and the thermal response element 5 may be in contact with each other.
  • the movable piece 4, the thermally responsive element 5, the PTC thermistor 6 and the fixed piece 2 are conducting as a circuit.
  • the resistance of the PTC thermistor 6 is overwhelmingly larger than the resistance of the movable piece 4, the current flowing through the PTC thermistor 6 is substantially It is negligible.
  • Fig. 3 shows the operation of the breaker 1 in an overcharged state or in the event of an abnormality.
  • the thermally responsive element 5, which has a structure in which thin plate materials having different coefficients of thermal expansion are laminated, deforms so that the curved initial shape shown in FIG. 2 is corrected as the temperature rises. Then, the thermally responsive element 5 that reaches the operating temperature is snap-deformed into a reverse warped shape as shown in FIG. As a result, the thermally responsive element 5 comes into contact with the elastic portion 44 of the movable piece 4 , and the thermally responsive element 5 pushes up the elastic portion 44 to separate the fixed contact 21 and the movable contact 41 . At this time, the current flowing between the fixed contact 21 and the movable contact 41 is cut off.
  • the thermally responsive element 5 is in contact with the movable piece 4 and a slight leakage current flows through the thermally responsive element 5 and the PTC thermistor 6 . That is, the PTC thermistor 6 electrically connects the fixed piece 2 and the movable piece 4 via the thermally responsive element 5 that switches the movable piece 4 to the cut-off state.
  • the PTC thermistor 6 continues to generate heat as long as such a leakage current flows, and the resistance value increases sharply while keeping the thermal responsive element 5 in a state of reverse warping. does not flow and there is only the slight leakage current mentioned above (constituting a self-holding circuit). This leakage current can be used for other functions of the safety device.
  • FIG. 4 shows the lid member 8 in which the movable piece 4 and the cover piece 9 are embedded.
  • the lid member 8 has an embedded portion 81 in which the movable piece 4 is embedded and a first recessed portion 82 .
  • the embedded portion 81 embeds the fixed portion 43 of the movable piece 4 .
  • the movable piece 4 is fixed to the lid member 8 at an accurate position.
  • the embedded portion 81 is formed extending in the lateral direction D ⁇ b>1 of the movable piece 4 along the terminal 42 side edge of the cover member 8 .
  • the embedded portion 81 of this embodiment extends to the edge of the cover member 8 in the lateral direction D1.
  • the first concave portion 82 is recessed from the embedded portion 81 in the thickness direction of the lid member 8 .
  • the first concave portion 82 is formed on both outer sides of the movable piece 4 in the short direction D1. Furthermore, the first concave portion 82 of this embodiment is formed along the longitudinal direction D2 of the movable piece 4 .
  • the first concave portion 82 constitutes part of an accommodating concave portion 83 that accommodates the movable contact 41 and the elastic portion 44 of the movable piece 4 .
  • FIG. 5 shows the case body 7 in which the fixing piece 2 is embedded.
  • the case body 7 has a first protrusion 74 protruding toward the lid member 8 side.
  • the first protrusion 74 is formed in a position and shape corresponding to the first recess 82 .
  • the first convex portion 74 preferably includes a first side surface 74a perpendicular to the short direction D1 of the movable piece 4 and a second side surface 74b perpendicular to the longitudinal direction D2 of the movable piece 4.
  • the first side surface 74a and the second side surface 74b are orthogonal to each other.
  • the first recess 82 includes a third side surface 82a facing the first side surface 74a and a fourth side surface 82b facing the second side surface 74b.
  • the contact between the first side surface 74a and the third side surface 82a suppresses displacement of the lid member 8 with respect to the case body 7 in the lateral direction D1. Due to the contact between the second side surface 74b and the fourth side surface 82b, displacement of the lid member 8 with respect to the case body 7 in the longitudinal direction D2 is suppressed.
  • the lid member 8 has a first bottom surface 84a and a second bottom surface 84b.
  • the first bottom surface 84 a is formed from the periphery of the movable contact 41 to the side of the elastic portion 44 .
  • a second bottom surface 84 b is formed in the embedded portion 81 .
  • the embedded portion 81 projects toward the case main body 7 in order to embed the fixed portion 43 of the movable piece 4 therein. Therefore, the second bottom surface 84b protrudes toward the case body 7 side more than the first bottom surface 84a.
  • the case body 7 has a first top surface 75a and a second top surface 75b.
  • the first top surface 75 a is formed from the periphery of the fixed contact 21 to the lateral periphery of the housing recess 73 .
  • the second top surface 75 b is formed on the terminal 42 side of the movable piece 4 with respect to the housing recess 73 .
  • the height of the second top surface 75b relative to the first top surface 75a is set according to the height of the second bottom surface 84b relative to the first bottom surface 84a. Therefore, the height of the first top surface 75a from the bottom surface (second surface) of the case body 7 is higher than the height of the second top surface 75b.
  • a pair of first slopes 76 are formed on the case body 7 .
  • the first slope 76 is formed outside the first protrusion 74 in the lateral direction D1.
  • the first slope 76 is arranged between the first top surface 75a and the second top surface 75b, and connects the first top surface 75a and the second top surface 75b that are different in height.
  • the first top surface 75a, the second top surface 75b, and the first slope 76 constitute an outer peripheral portion that continuously circles the outer edge of the case main body 7. As shown in FIG.
  • a pair of second slopes 85 are formed on the lid member 8 .
  • the second slope 85 is formed at a position corresponding to the first slope 76, that is, outside the first concave portion 82 in the lateral direction D1.
  • the second slope 85 is arranged between the first bottom surface 84a and the second bottom surface 84b, and connects the first bottom surface 84a and the second bottom surface 84b that are different in height.
  • the first bottom surface 84a, the second bottom surface 84b, and the second slope 85 form an outer peripheral portion that continuously circles the outer edge of the lid member 8. As shown in FIG.
  • the first slope 76 and the second slope 85 are brought into contact and welded.
  • the first slope 76 and the second slope 85 smoothly absorb the difference in level between the first top surface 75a and the second top surface 75b and the difference in level between the first bottom surface 84a and the second bottom surface 84b.
  • the airtightness with 8 is easily enhanced.
  • a rib 86 is preferably formed on the second slope 85 .
  • the rib 86 is formed to protrude toward the case body 7 along the outer edge of the lid member 8 .
  • the ribs 86 are melted at the initial stage, and the welding between the case main body 7 and the lid member 8 is improved.
  • the rib 86 is formed continuously from the second slope 85 to the embedded portion 81 .
  • the rib 86 of this embodiment is formed continuously around the outer edge of the lid member 8 along the first bottom surface 84a, the second slope 85, and the second bottom surface 84b. Such ribs 86 further improve the welding between the case main body 7 and the lid member 8 , and easily improve the airtightness between the case main body 7 and the lid member 8 .
  • a rib may be formed on the first slope 76 instead of the rib 86 .
  • a second concave portion 77 is formed in the case main body 7 .
  • the second recess 77 is arranged closer to the fixed contact 21 than the opening 73c for accommodating the thermally responsive element 5.
  • second recesses 77 are provided on both sides of the fixed contact 21 in the lateral direction D1.
  • a second protrusion 87 is formed on the lid member 8 .
  • the second protrusion 87 is formed at a position corresponding to the second recess 77 .
  • the cover member 8 is attached to the case main body 7 , the second convex portion 87 is fitted into the second concave portion 77 .
  • the cover member 8 is more accurately positioned with respect to the case body 7 around the fixed contact 21 and the movable contact 41 .
  • the fitting of the first convex portion 74 and the first concave portion 82 and the fitting of the second convex portion 87 and the second concave portion 77 allow the lid member 8 as a whole to be more rigid than the case body 7 . Accurately positioned and secured.
  • the first projection 74 be arranged outside the housing recess 73 in the longitudinal direction D2.
  • the lid member 8 is positioned and fixed to the case body 7 more accurately.
  • the second concave portion 77 is arranged on the opposite side of the first convex portion 74 in the longitudinal direction D2 with the accommodation concave portion 73 interposed therebetween. With such a configuration, the lid member 8 is more accurately positioned and fixed to the case body 7 near its four corners.
  • the lid member 8 of this embodiment includes a protruding portion 88 protruding from the embedded portion 81 toward the movable contact 41 side.
  • the projecting portion 88 By providing the projecting portion 88, the movable piece 4 is sandwiched between the cover piece 9 and the projecting portion 88, and the movable piece 4 is firmly fixed to the lid member 8 at an accurate position.
  • the protrusion 88 is desirably formed between the pair of first recesses 82 .
  • the first recesses 82 are formed on both sides of the projecting portion 88 in the transverse direction D1. With such arrangement, the movable piece 4 is positioned with respect to the case body 7 more accurately.
  • the breaker 1 of the present invention has at least a fixed contact 21, an elastic portion 44 that elastically deforms, and a movable contact 41 at one end of the elastic portion 44.
  • the movable contact 41 is pressed against the fixed contact 21 to make contact.
  • the movable piece 4 is deformed according to the temperature change, so that the movable piece 4 shifts from the conductive state in which the movable contact 41 contacts the fixed contact 21 to the disconnected state in which the movable contact 41 separates from the fixed contact 21.
  • a breaker (1) comprising: a case body (7) having an element (5); a case body (7) having a housing recess (73) for housing a fixed contact (21), a movable piece (4) and a thermally responsive element (5);
  • the lid member 8 has an embedded portion 81 in which a part of the movable piece 4 is embedded, and a first recess 82 that is recessed in the thickness direction of the lid member 8.
  • the case body 7 has the first recess 82 It suffices if it has the first convex portion 74 that can be fitted to.

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  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Thermally Actuated Switches (AREA)
PCT/JP2022/036941 2021-11-12 2022-10-03 ブレーカー、安全回路及び２次電池パック Ceased WO2023084944A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US18/708,571 US20250006443A1 (en) 2021-11-12 2022-10-03 Breaker, Safety circuit and Secondary battery pack
EP22892444.5A EP4398281A4 (en) 2021-11-12 2022-10-03 CIRCUIT BREAKER, SAFETY CIRCUIT AND SECONDARY BATTERY PACK

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021184780A JP7776967B2 (ja) 2021-11-12 2021-11-12 ブレーカー、安全回路及び２次電池パック
JP2021-184780 2021-11-12

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WO2011105175A1 (ja) 2010-02-26 2011-09-01 株式会社小松ライト製作所 ブレーカー
JP2014120302A (ja) * 2012-12-14 2014-06-30 Otsuka Techno Kk ブレーカ
JP2015141880A (ja) * 2014-01-30 2015-08-03 株式会社小松ライト製作所 電流遮断装置

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