WO2023119887A1 - Breaker, safety circuit, and secondary battery pack - Google Patents
Breaker, safety circuit, and secondary battery pack Download PDFInfo
- Publication number
- WO2023119887A1 WO2023119887A1 PCT/JP2022/040678 JP2022040678W WO2023119887A1 WO 2023119887 A1 WO2023119887 A1 WO 2023119887A1 JP 2022040678 W JP2022040678 W JP 2022040678W WO 2023119887 A1 WO2023119887 A1 WO 2023119887A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- contact
- breaker
- movable piece
- resin case
- fixed
- Prior art date
Links
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Images
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
- 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
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/02—Bases, casings, or covers
-
- 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 case main body is formed with a housing recess for housing the thermally responsive element.
- the molten resin generated when the case is welded is excessively large and flows into the housing recess, it may impede the movement of the thermally responsive element and the movable piece, resulting in malfunction of the breaker.
- the present invention has been devised in view of the actual situation as described above, and the main object thereof is to provide a circuit breaker capable of suppressing the inflow of molten resin into the accommodation recess that occurs when the case is welded.
- the present invention includes a fixed contact, a movable piece having an elastic portion formed in a plate shape and elastically deformable, and a movable contact at one end of the elastic portion, and pressing the movable contact against the fixed contact so as to make contact with the fixed contact; a thermally responsive element that transforms the movable piece from a conductive state in which the movable contact contacts the fixed contact to a disconnected state in which the movable contact separates from the fixed contact by deforming with temperature change; and the fixed contact. and a first resin case formed with an accommodation recess for accommodating the thermally responsive element, and a second resin case integrated with the movable piece and fixed to the first resin case to cover the accommodation recess.
- the movable piece protrudes outside the second resin case and is embedded in the second resin case between a terminal connected to an external circuit and the elastic portion and the terminal.
- the second resin case has a protrusion that protrudes toward the first resin case for embedding the fixing part;
- the first resin case has the protrusion and a projecting portion projecting toward the second resin case between the housing recess and the welding portion.
- the tip of the convex portion is formed with a rib mark that is melted by coming into contact with the welded portion.
- the rib marks are continuously extended along the outer edge of the second resin case, and the first portion formed on the convex portion and the second portion formed on the portion other than the convex portion are formed. and wherein the volume of said first portion per unit length along said outer edge is greater than the volume of said second portion per unit length.
- the welded portion is formed with a rib trace that has been melted by coming into contact with the tip of the convex portion.
- the rib marks are continuously extended along the outer edge of the first resin case, and the first portion formed at the welded portion and the second portion formed at the portion other than the welded portion are formed. and wherein the volume of said first portion per unit length along said outer edge is greater than the volume of said second portion per unit length.
- the breaker according to the present invention preferably has a resin reservoir between the protrusion and the rib marks.
- the resin reservoir section is recessed from the formation surface of the welding section.
- a gap is provided between the tip of the projecting portion and the movable piece.
- the present invention is a safety circuit for electrical equipment, comprising the breaker.
- the present invention is a secondary battery pack including the breaker.
- the second resin case has a protrusion protruding toward the first resin case for embedding the fixed portion of the movable piece, and the first resin case is welded to the protrusion. have a part.
- the resin forming the protrusion and the welded portion is melted.
- the molten resin is dammed between the housing recess and the welded portion by the projecting portion projecting toward the second resin case, thereby suppressing the flow into the housing recess. As a result, the movement of the thermally responsive element and the movable piece becomes smooth, and stable breaker operation is obtained.
- 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
- FIG. 3 is an enlarged cross-sectional view showing the welded portion, the projecting portion, the convex portion, and the periphery thereof in FIG. 2 ;
- FIG. 3 is an enlarged cross-sectional view showing the welded portion, the projecting portion, the convex portion, and the periphery thereof in FIG. 2 ;
- FIG. 3 is an enlarged cross-sectional view showing the welded portion, the projecting portion, the convex portion, and the periphery thereof in FIG. 2 ;
- FIG. 4 is an enlarged cross-sectional view showing the welded portion, the projecting portion, the convex portion, and the periphery thereof in FIG. 3 ;
- 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 and integrated with the lid member 8 .
- 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 thermally responsive element 5 changes the state of the movable piece 4 from a conductive state in which the movable contact 41 contacts the fixed contact 21 to a disconnected state in which the movable contact 41 separates from the fixed contact 21 by deforming with temperature changes.
- 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 characteristics.
- 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 a 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 cover 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 thermal response element 5 comes into contact with the elastic portion 44 of the movable piece 4 , and the thermal response 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 movable piece 4 has a terminal 42 and a fixed portion 43 .
- the fixed portion 43 is formed between the elastic portion 44 and the terminal 42 .
- the fixed portion 43 is embedded in the resin forming the cover member 8 together with the cover piece 9 and fixed to the cover member 8 . Thereby, the movable piece 4 and the lid member 8 are integrated.
- the fixing portion 43 of this embodiment is in contact with the cover piece 9 . This stabilizes the posture of the movable piece 4 with respect to the lid member 8 .
- the lid member 8 has a convex portion 81 protruding toward the case body 7 and a housing recess 82 recessed on the opposite side of the case body 7 .
- the convex portion 81 protrudes to embed the fixed portion 43 of the movable piece 4 .
- the movable piece 4 is fixed to the cover member 8 at an accurate position by burying the fixed portion 43 with the convex portion 81 .
- the convex portion 81 is formed to extend in the lateral direction D1 of the movable piece 4 along the terminal 42 side edge of the lid member 8 .
- the convex portion 81 of this embodiment extends to the edge of the lid member 8 in the lateral direction D1.
- the accommodation recess 82 is recessed to accommodate the movable contact 41 and the elastic portion 44 of the movable piece 4 .
- the movable contact 41 , the elastic portion 44 and the cover piece 9 are exposed to the internal space inside the resin case 10 by forming the housing recess 82 in the lid member 8 .
- FIG. 5 shows the case body 7 in which the fixing piece 2 is embedded.
- the case body 7 has a welded portion 74 and a projecting portion 75 .
- the welded portion 74 is arranged at a position facing the convex portion 81 when the cover member 8 is attached to the case body 7 .
- the welded portion 74 is formed in a planar shape from the end edge of the movable piece 4 in the longitudinal direction D ⁇ b>2 of the case body 7 toward the housing recess 73 .
- the welded portion 74 is welded to and integrated with the convex portion 81 .
- the protruding portion 75 is arranged between the housing recess 73 and the region 74 a of the welding portion 74 that is welded to the convex portion 81 .
- the protrusion 75 protrudes from the planar welded portion 74 toward the lid member 8 .
- the projecting portion 75 extends like a wall along the lateral direction D1.
- a rib 83 projecting toward the case body 7 is formed at the tip of the projection 81 .
- a rib 83 is formed in the convex portion 81 along the lateral direction D1.
- the projecting portion 81 and the welded portion 74 are firmly integrated, and even if, for example, an excessive external force is applied to the terminal 42 of the movable piece 4, the projecting portion 81 and the welded portion 74 do not separate from each other. is suppressed.
- the ribs 83 can be confirmed as rib traces (welding traces) 84 in the completed breaker 1 as well. For example, when the lid member 8 is peeled off from the case body 7 and the breaker 1 is dismantled, the ribs 83 are confirmed as rib traces 84 on the protrusions 81 of the lid member 8 .
- the ribs 83 extend continuously along the outer edge of the lid member 8 all the way around.
- the rib 83 has a first portion 83a formed on the convex portion 81 and a second portion 83b formed outside the convex portion 81.
- the case main body 7 and the lid member 8 are welded continuously and satisfactorily along the outer edge of the resin case 10, and the sealing performance of the resin case 10 is enhanced.
- the rib traces 84 are continuously formed along the outer edge of the lid member 8 over the entire circumference.
- the volume of the first portion 83a per unit length along the outer edge of the lid member 8 is larger than the volume of the second portion 83b per unit length along the outer edge of the lid member 8.
- the convex portion 81 and the welded portion 74 are more firmly integrated, and separation between the convex portion 81 and the welded portion 74 is further suppressed. Good welding is achieved, and the sealing performance of the resin case 10 is enhanced.
- the rib mark 84 includes a first portion 84a formed on the convex portion 81 and a second portion 84b formed outside the convex portion 81. As shown in FIG.
- the volume of the first portion 84 a per unit length along the outer edge of the lid member 8 is larger than the volume of the second portion 84 b per unit length along the outer edge of the lid member 8 .
- the rib mark 76 can also be confirmed at the welded portion 74 of the case body 7.
- the rib marks 76 are indicated by dotted hatching.
- the rib marks 76 preferably extend continuously along the outer edge of the case body 7 .
- the rib mark 76 includes a first portion 76 a formed in the welded portion 74 and a second portion 76 b formed outside the welded portion 74 , and is the first portion per unit length along the outer edge of the case main body 7 .
- the volume of the portion 76a is preferably greater than the volume of the second portion 76b per unit length along the outer edge of the case body 7.
- ribs may be formed along the welded portion 74 and the outer edge of the case body 7. Also in this case, the case main body 7 and/or the lid member 8 are formed with rib traces 76 and/or rib traces 84 similar to those described above.
- FIG. 6 shows an enlarged view of the welded portion 74, the projecting portion 75, the projecting portion 81 and their surroundings in FIG. It is desirable that the breaker 1 has a resin reservoir 77 between the protrusion 75 and the trace of the rib.
- the resin reservoir portion 77 of this embodiment is provided between the convex portion 81 and the projecting portion 75 .
- the resin reservoir portion 77 accommodates the resin melted as the convex portion 81 and the welding portion 74 are welded together. As a result, the flow of molten resin into the housing recess 73 is further suppressed, the movement of the thermally responsive element 5 and the movable piece 4 becomes smoother, and the breaker 1 operates stably.
- the resin reservoir portion 77 may be recessed from the formation surface 74b of the welding portion 74. With such a configuration, the volume of the resin reservoir 77 can be easily increased. Therefore, the volume of the first portion 83a of the rib 83 can be easily increased, and the convex portion 81 and the welding portion 74 can be more firmly integrated.
- a gap (clearance) 78 is provided between the tip of the projecting portion 75 and the movable piece 4 .
- contact between the projecting portion 75 and the movable piece 4 is avoided, and cutting (damage) of the projecting portion 75 due to vibration when the case body 7 and the lid member 8 are welded together is suppressed. Therefore, generation of cutting powder and entry into the housing recess 73 are suppressed.
- FIG. 7 is an enlarged view of the welded portion 74, the protruding portion 75, the protruding portion 81 and their surroundings in FIG.
- the protruding portion 75 protrudes toward the lid member 8 from the thermally responsive element 5 during thermal deformation.
- the projection 44a formed on the elastic portion 44 of the movable piece 4 abuts against the thermal responsive element 5, so that the tip of the projecting portion 75 is positioned at the rear end of the thermal responsive element 5 (on the side of the terminal 42). edge) 5a to the side of the movable piece 4 (upper side in the figure). According to such a configuration, it is possible to prevent the rear end 5a of the thermally responsive element 5 from moving toward the terminal 42 and entering the gap 78 during thermal deformation.
- the lid member 8 of this embodiment may include a projecting portion 88 projecting from the projecting 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 breaker 1 of the present invention has at least a fixed contact 21, an elastic portion 44 formed in a plate shape and elastically deformable, and a movable contact 41 at one end of the elastic portion 44.
- the movable contact 41 is a fixed contact.
- the movable piece 4 is pressed and brought into contact with the fixed contact 21, and the movable piece 4 is deformed with a change in temperature to break the movable contact 41 away from the fixed contact 21 from the conductive state in which the movable contact 41 contacts the fixed contact 21.
- a case body 7 formed with a thermally responsive element 5 to shift to a state, a fixed contact 21, and a housing recess 73 for housing the thermally responsive element 5 is integrated with the movable piece 4 and fixed to the case body 7.
- the breaker 1 includes a lid member 8 that covers the housing recess 73 , and the movable piece 4 protrudes outside the lid member 8 and connects a terminal 42 connected to an external circuit and an elastic portion 44 and the terminal 42 .
- the lid member 8 has a fixing portion 43 embedded and fixed in the lid member 8 between the lid member 8 and the lid member 8. may have a welding portion 74 welded to the projection 81 and a projecting portion 75 projecting toward the lid member 8 between the receiving recess 73 and the welding portion 74 .
- the movable piece 4 and the thermally responsive element 5 may be integrally formed by forming the movable piece 4 from a laminated metal such as bimetal or trimetal. In this case, the configuration of the breaker 1 and the like is simplified.
- the present embodiment has a self-holding circuit using the PTC thermistor 6, it is also possible to apply a form in which such a configuration is omitted.
- FIG. 8 shows a secondary battery pack 500.
- a secondary battery pack 500 includes a secondary battery 501 and a breaker 1 provided in an output circuit of the secondary battery 501 .
- FIG. 9 shows a safety circuit 502 for electrical equipment.
- the safety circuit 502 has a breaker 1 in series in the output circuit of the secondary battery 501 . According to the secondary battery pack 500 or the safety circuit 502 having the breaker 1, it is possible to realize the secondary battery pack 500 or the safety circuit 502 in which stable conduction is obtained.
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Abstract
This breaker 1 comprises: a fixed contact 21; a movable piece 4 having a movable contact 41; a thermal stress moving element 5 that deforms in association with a change in temperature; a case body 7 in which is formed an accommodating recess 73 for accommodating the fixed contact 21 and the thermal stress moving element 5; and a lid member 8 integrated with the movable piece 4, the lid member 8 being fixed to the case body 7 and covering the accommodating recess 73. The movable piece 4 has a terminal 42 that protrudes to the outer side of the lid member 8 and is connected to an external circuit, and a securing part 43 that is buried in and secured to the lid member 8 between an elastic part 44 and the terminal 42. The lid member 8 has a projection 81 that protrudes toward the case body 7 in order to bury the securing part 43. The case body 7 has a welded part 74 that is welded to the projection 81, and a protruding part 75 that protrudes toward the lid member 8 between the accommodating recess 73 and the welded part 74.
Description
本発明は、電気機器等に内蔵される小型のブレーカー等に関する。
The present invention relates to a small breaker or the like built into an electrical device or the like.
従来、各種電気機器の2次電池やモーターやヒーター等の保護装置(安全回路)としてブレーカーが使用されている(例えば、特許文献1参照)。
Conventionally, 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).
上記特許文献1には、ケース本体と蓋部材とが超音波溶着されてケースを構成するブレーカーが開示されている。ケース本体には、熱応動素子を収容する収容凹部が形成されている。
Patent Document 1 above discloses a breaker in which a case body and a lid member are ultrasonically welded to form a case. The case main body is formed with a housing recess for housing the thermally responsive element.
しかしながら、ケースの溶着の際に生じる溶融樹脂が過大になり収容凹部に流入すると、熱応動素子及び可動片の動きを阻害し、ブレーカーの動作不良が生ずるおそれがある。
However, if the molten resin generated when the case is welded is excessively large and flows into the housing recess, it may impede the movement of the thermally responsive element and the movable piece, resulting in malfunction of the breaker.
本発明は、以上のような実状に鑑み案出されたもので、ケースの溶着時に生ずる溶融樹脂の収容凹部への流入を抑制できるブレーカーを提供することを主たる目的としている。
The present invention has been devised in view of the actual situation as described above, and the main object thereof is to provide a circuit breaker capable of suppressing the inflow of molten resin into the accommodation recess that occurs when the case is welded.
本発明は、固定接点と、板状に形成され、弾性変形する弾性部及び該弾性部の一端部に可動接点を有し、前記可動接点を前記固定接点に押圧して接触させる可動片と、温度変化に伴って変形することにより、前記可動片を前記可動接点が前記固定接点に接触する導通状態から前記可動接点が前記固定接点から離隔する遮断状態に移行させる熱応動素子と、前記固定接点、及び前記熱応動素子を収容するための収容凹部が形成された第1樹脂ケースと、前記可動片と一体化され、前記第1樹脂ケースに固着されて前記収容凹部を覆う第2樹脂ケースとを備えたブレーカーであって、前記可動片は、前記第2樹脂ケースの外側に突出し、外部回路に接続される端子と、前記弾性部と前記端子との間で前記第2樹脂ケースに埋設されて固定される固定部を有し、前記第2樹脂ケースは、前記固定部を埋設するために前記第1樹脂ケースの側に突出する凸部を有し、前記第1樹脂ケースは、前記凸部と溶着される溶着部及び前記収容凹部と前記溶着部との間で前記第2樹脂ケースの側に突出する突出部を有する。
The present invention includes a fixed contact, a movable piece having an elastic portion formed in a plate shape and elastically deformable, and a movable contact at one end of the elastic portion, and pressing the movable contact against the fixed contact so as to make contact with the fixed contact; a thermally responsive element that transforms the movable piece from a conductive state in which the movable contact contacts the fixed contact to a disconnected state in which the movable contact separates from the fixed contact by deforming with temperature change; and the fixed contact. and a first resin case formed with an accommodation recess for accommodating the thermally responsive element, and a second resin case integrated with the movable piece and fixed to the first resin case to cover the accommodation recess. wherein the movable piece protrudes outside the second resin case and is embedded in the second resin case between a terminal connected to an external circuit and the elastic portion and the terminal. the second resin case has a protrusion that protrudes toward the first resin case for embedding the fixing part; the first resin case has the protrusion and a projecting portion projecting toward the second resin case between the housing recess and the welding portion.
本発明に係る前記ブレーカーにおいて、前記凸部の先端部には、前記溶着部と当接し溶融したリブ跡が形成されている、ことが望ましい。
In the breaker according to the present invention, it is desirable that the tip of the convex portion is formed with a rib mark that is melted by coming into contact with the welded portion.
本発明に係る前記ブレーカーにおいて、前記リブ跡は、前記第2樹脂ケースの外縁に沿って連続的に延長され、前記凸部に形成された第1部と前記凸部以外に形成された第2部とを有し、前記外縁に沿った単位長さあたりの前記第1部の体積は、前記単位長さあたりの前記第2部の体積よりも大きい、ことが望ましい。
In the circuit breaker according to the present invention, the rib marks are continuously extended along the outer edge of the second resin case, and the first portion formed on the convex portion and the second portion formed on the portion other than the convex portion are formed. and wherein the volume of said first portion per unit length along said outer edge is greater than the volume of said second portion per unit length.
本発明に係る前記ブレーカーにおいて、前記溶着部には、前記凸部の先端部と当接し溶融したリブ跡が形成されている、ことが望ましい。
In the breaker according to the present invention, it is preferable that the welded portion is formed with a rib trace that has been melted by coming into contact with the tip of the convex portion.
本発明に係る前記ブレーカーにおいて、前記リブ跡は、前記第1樹脂ケースの外縁に沿って連続的に延長され、前記溶着部に形成された第1部と前記溶着部以外に形成された第2部とを有し、前記外縁に沿った単位長さあたりの前記第1部の体積は、前記単位長さあたりの前記第2部の体積よりも大きい、ことが望ましい。
In the circuit breaker according to the present invention, the rib marks are continuously extended along the outer edge of the first resin case, and the first portion formed at the welded portion and the second portion formed at the portion other than the welded portion are formed. and wherein the volume of said first portion per unit length along said outer edge is greater than the volume of said second portion per unit length.
本発明に係る前記ブレーカーにおいて、前記突出部と前記リブ跡との間に、樹脂溜め部を有する、ことが望ましい。
The breaker according to the present invention preferably has a resin reservoir between the protrusion and the rib marks.
本発明に係る前記ブレーカーにおいて、前記樹脂溜め部は、前記溶着部の形成面から陥没している、ことが望ましい。
In the breaker according to the present invention, it is desirable that the resin reservoir section is recessed from the formation surface of the welding section.
本発明に係る前記ブレーカーにおいて、前記突出部の先端と前記可動片との間に隙間が設けられている、ことが望ましい。
In the breaker according to the present invention, it is desirable that a gap is provided between the tip of the projecting portion and the movable piece.
本発明は、前記ブレーカーを備える、電気機器用の安全回路である。
The present invention is a safety circuit for electrical equipment, comprising the breaker.
本発明は、前記ブレーカーを備える、2次電池パックである。
The present invention is a secondary battery pack including the breaker.
本発明のブレーカーでは、第2樹脂ケースは、可動片の固定部を埋設するために第1樹脂ケースの側に突出する凸部を有し、第1樹脂ケースは、凸部と溶着される溶着部を有する。第1樹脂ケースと第2樹脂ケースとの溶着の際には、凸部及び溶着部を構成する樹脂が溶融する。本発明のブレーカーでは、溶融した樹脂が、収容凹部と溶着部との間で第2樹脂ケースの側に突出する突出部によって堰き止められ、収容凹部への流入が抑制される。これにより、熱応動素子及び可動片の動きが円滑となり、安定したブレーカーの動作が得られる。
In the circuit breaker of the present invention, the second resin case has a protrusion protruding toward the first resin case for embedding the fixed portion of the movable piece, and the first resin case is welded to the protrusion. have a part. When the first resin case and the second resin case are welded together, the resin forming the protrusion and the welded portion is melted. In the breaker of the present invention, the molten resin is dammed between the housing recess and the welded portion by the projecting portion projecting toward the second resin case, thereby suppressing the flow into the housing recess. As a result, the movement of the thermally responsive element and the movable piece becomes smooth, and stable breaker operation is obtained.
本発明の一実施形態によるブレーカーについて図面を参照して説明する。図1乃至図3は、本発明によって製造されるブレーカー1の構成を示している。ブレーカー1は、電気機器等に実装され、過度な温度上昇又は過電流から電気機器を保護する。
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.
ブレーカー1は、固定接点21を有する固定片2と、一端部に可動接点41を有する可動片4と、温度変化に伴って変形する熱応動素子5と、PTC(Positive Temperature Coefficient)サーミスター6と、固定片2、可動片4、熱応動素子5及びPTCサーミスター6を収容する樹脂ケース10等によって構成されている。樹脂ケース10は、ケース本体(第1樹脂ケース)7とケース本体7の上面に装着される蓋部材(第2樹脂ケース)8等によって構成されている。
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.
固定片2は、例えば、銅等を主成分とする金属板(この他、銅-チタニウム合金、洋白、黄銅などの金属板)をプレス加工することにより形成され、インサート成形によりケース本体7に埋め込まれている。固定片2の一端側には外部回路と電気的に接続される端子22が形成され、他端側には、PTCサーミスター6を支持する支持部23が形成されている。端子22は、ケース本体7の外側に突出している。PTCサーミスター6は、固定片2の支持部23に3箇所形成された凸状の突起(ダボ)24の上に載置されて、突起24に支持される。固定片2が階段状に曲げられることにより、固定接点21と支持部23とが段違いに配置され、PTCサーミスター6を収納する空間が容易に確保される。
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 . By bending the fixed piece 2 in a stepped manner, the fixed contact 21 and the support portion 23 are arranged at different levels, and a space for accommodating the PTC thermistor 6 is easily secured.
固定接点21は、銀、ニッケル、ニッケル-銀合金の他、銅-銀合金、金-銀合金などの導電性の良い材料のクラッド、メッキ、溶接又は塗布等により可動接点41に対向する位置に形成され、ケース本体7の内部に形成されている開口73aの一部から露出されている。端子22はケース本体7の端縁から外側に突き出されている。支持部23は、ケース本体7の内部に形成されている開口73dから露出されている。
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 .
本出願においては、特に断りのない限り、固定片2において、固定接点21が形成されている側の面(すなわち図1において上側の面)を第1面、その反対側の面を第2面として説明している。他の部品、例えば、可動片4及び熱応動素子5、PTCサーミスター6、樹脂ケース10等についても同様である。
In this application, unless otherwise specified, 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.
可動片4は、銅等を主成分とする板状の金属材料をプレス加工することにより、長手方向の中心線に対して対称なアーム状に形成されている。可動片4の一部(後述する固定部43)は、蓋部材8にインサート成形により埋め込まれ、蓋部材8と一体化されている。
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 and integrated with the lid member 8 .
可動片4の長手方向の一端部には、可動接点41が形成されている。可動接点41は、例えば、固定接点21と同等の材料によって形成され、溶接の他、クラッド、かしめ(crimping)等の手法によって可動片4の一端部に接合されている。
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.
可動片4の他端部には、外部回路と電気的に接続される端子42が形成されている。端子42は、蓋部材8の端縁から外側に突き出されている。可動接点41と端子42との間には、蓋部材8に埋設され固定される固定部43が設けられている。固定部43は端子42の側に配されている。
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.
可動片4は、可動接点41と固定部43との間に、弾性部44を有している。弾性部44は、固定部43から可動接点41の側に延出されている。可動片4は、弾性部44の基端側の固定部43で、蓋部材8によって片持ち支持され、その状態で弾性部44が第1面の側に弾性変形することにより、弾性部44の先端部に形成されている可動接点41が固定接点21の側に押圧されて接触し、固定片2と可動片4とが通電可能となる。
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.
可動片4は、弾性部44において、プレス加工により湾曲又は屈曲されているのが望ましい。湾曲又は屈曲の度合いは、熱応動素子5を収納できる限り特に限定はなく、動作温度及び復帰温度における弾性力、接点の押圧力などを考慮して適宜設定すればよい。また、弾性部44の第2面には、熱応動素子5に対向して一対の突起(接触部)44a,44bが形成されている。突起44a,44bと熱応動素子5とは接触して、突起44a,44bを介して熱応動素子5の変形が弾性部44に伝達される(図1、図2及び図3参照)。
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).
熱応動素子5は、可動片4とPTCサーミスター6との間に配されている。すなわち、熱応動素子5は、後述するPTCサーミスター6の第1面上に載置されている。熱応動素子5は、温度変化に伴って変形することにより、可動片4の状態を可動接点41が固定接点21に接触する導通状態から可動接点41が固定接点21から離隔する遮断状態に移行させる。熱応動素子5は、熱膨張率の異なる薄板材を積層することにより板状に形成され、断面が円弧状に湾曲した初期形状をなしている。過熱により反転動作温度に達すると、熱応動素子5の湾曲形状は、スナップモーションを伴って逆反りし、冷却により正転復帰温度を下回ると復元する。熱応動素子5の初期形状は、プレス加工により形成することができる。所期の温度で熱応動素子5の逆反り変形により可動片4の弾性部44が押し上げられ、かつ弾性部44の弾性力により元に戻る限り、熱応動素子5の材料及び形状は特に限定されるものでないが、生産性及び逆反り変形の効率性の観点から矩形状が望ましい。
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 thermally responsive element 5 changes the state of the movable piece 4 from a conductive state in which the movable contact 41 contacts the fixed contact 21 to a disconnected state in which the movable contact 41 separates from the fixed contact 21 by deforming with temperature changes. . 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. When the reversing operation temperature is reached due to overheating, 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 . However, from the viewpoint of productivity and efficiency of reverse warp deformation, a rectangular shape is desirable.
熱応動素子5の材料としては、洋白、黄銅、ステンレス鋼等の各種の合金からなる熱膨張率の異なる2種類の材料を積層したものが、所要条件に応じて組み合わせて使用される。例えば、安定した反転動作温度及び正転復帰温度が得られる熱応動素子5の材料としては、高膨脹側に銅-ニッケル-マンガン合金、低膨脹側に鉄-ニッケル合金を組み合わせたものが望ましい。また、化学的安定性の観点からさらに望ましい材料として、高膨脹側に鉄-ニッケル-クロム合金、低膨脹側に鉄-ニッケル合金を組み合わせたものが挙げられる。さらにまた、化学的安定性及び加工性の観点からさらに望ましい材料として、高膨脹側に鉄-ニッケル-クロム合金、低膨脹側に鉄-ニッケル-コバルト合金を組み合わせたものが挙げられる。
As 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. For example, as 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. From the viewpoint of chemical stability, 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. Furthermore, from the viewpoint of chemical stability and workability, 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.
PTCサーミスター6は、可動片4が遮断状態にあるとき、熱応動素子5を介して固定片2と可動片4とを導通させる。PTCサーミスター6は、固定片2と熱応動素子5との間に配設されている。すなわち、PTCサーミスター6を挟んで、固定片2の支持部23は熱応動素子5の直下に位置している。熱応動素子5の逆反り変形により固定片2と可動片4との通電が遮断されたとき、PTCサーミスター6に流れる電流が増大する。PTCサーミスター6は、温度上昇と共に抵抗値が増大して電流を制限する正特性サーミスターであれば、作動電流、作動電圧、作動温度、復帰温度などの必要に応じて種類を選択でき、その材料及び形状はこれらの諸特性を損なわない限り特に限定されるものではない。本実施形態では、チタニウム酸バリウム、チタニウム酸ストロンチウム又はチタニウム酸カルシウムを含むセラミック焼結体が用いられる。セラミック焼結体の他、ポリマーにカーボン等の導電性粒子を含有させたいわゆるポリマーPTCを用いてもよい。
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 . In other words, 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. When the conduction between the fixed piece 2 and the movable piece 4 is interrupted due to reverse warping deformation of the thermally responsive element 5, the current flowing through the PTC thermistor 6 increases. If the PTC thermistor 6 is a positive characteristic thermistor that limits the current by increasing the resistance value as the temperature rises, 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 characteristics. In this embodiment, a ceramic sintered body containing barium titanate, strontium titanate, or calcium titanate is used. In addition to the ceramic sintered body, a so-called polymer PTC in which conductive particles such as carbon are contained in a polymer may be used.
樹脂ケース10を構成するケース本体7及び蓋部材8は、難燃性のポリアミド、耐熱性に優れたポリフェニレンサルファイド(PPS)、液晶ポリマー(LCP)、ポリブチレンテレフタレート(PBT)などの熱可塑性樹脂により成形されている。上述した樹脂と同等以上の特性が得られるのであれば、樹脂以外の材料を適用してもよい。
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.
ケース本体7の第1面側には、固定接点21、可動片4、熱応動素子5及びPTCサーミスター6などを収容するための内部空間である収容凹部73が形成されている。収容凹部73は、固定接点21、可動片4を収容するための開口73a、可動片4及び熱応動素子5を収容するための開口73c、並びに、PTCサーミスター6を収容するための開口73d等を有している。なお、ケース本体7に組み込まれた可動片4、熱応動素子5の端縁は、収容凹部73を構成する枠によってそれぞれ当接され、熱応動素子5の逆反り変形時に案内される。すなわち、収容凹部73は、可動片4及び熱応動素子5を変形可能に収容する。
On the first surface side of the case body 7, 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 a 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.
蓋部材8は、収容凹部73を覆うように構成されている。蓋部材8は、収容凹部73の少なくとも一部を覆う形態であってもよい。蓋部材8には、銅等を主成分とする金属板又はステンレス鋼等のカバー片9がインサート成形によって埋め込まれている。カバー片9は、可動片4の固定部43の第1面と当接した状態で、固定部43と共に蓋部材8に埋設される。カバー片9は、可動片4の動きを規制すると共に、蓋部材8ひいては筐体としての樹脂ケース10の剛性・強度を高めつつブレーカー1の小型化に貢献する。
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.
ケース本体7及び蓋部材8は、上記樹脂材料を用いた射出成形により形成される。既に述べたように、ケース本体7には、固定片2がインサートされ、蓋部材8には、可動片4及びカバー片9がインサートされる。
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 cover member 8 .
図1が示すように、固定片2、可動片4、熱応動素子5及びPTCサーミスター6等を収容したケース本体7の開口73a、73c等を塞ぐように、蓋部材8が、ケース本体7に装着される。蓋部材8によって収容凹部73を覆われる。ケース本体7と蓋部材8とは、例えば超音波溶着によって接合される。これにより、樹脂ケース10が形成される。
As shown in FIG. 1, 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.
図2及び図3は、ブレーカー1の動作の概略を示している。図2は、通常の充電又は放電状態におけるブレーカー1の動作を示している。通常の充電又は放電状態においては、熱応動素子5は逆反り前の初期形状を維持している。弾性部44によって可動接点41が固定接点21の側に押圧されることにより、可動接点41と固定接点21とが接触し、可動片4の弾性部44を介してブレーカー1の固定片2と可動片4とが導通可能な状態とされる。
Figures 2 and 3 outline the operation of the breaker 1. FIG. 2 shows the operation of breaker 1 in normal charging or discharging conditions. In a normal charge or discharge state, the thermal responsive element 5 maintains its initial shape before reverse warping. When 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.
可動片4の弾性部44と熱応動素子5とは接触していてもよい。この場合、可動片4、熱応動素子5、PTCサーミスター6及び固定片2は、回路として導通している。しかし、PTCサーミスター6の抵抗は、可動片4の抵抗に比べて圧倒的に大きいため、PTCサーミスター6を流れる電流は、固定接点21及び可動接点41を流れる量に比して実質的に無視できる程度である。
The elastic portion 44 of the movable piece 4 and the thermal response element 5 may be in contact with each other. In this case, the movable piece 4, the thermally responsive element 5, the PTC thermistor 6 and the fixed piece 2 are conducting as a circuit. However, since 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.
図3は、過充電状態又は異常時などにおけるブレーカー1の動作を示している。熱膨張率の異なる薄板材が積層された構造の熱応動素子5は、温度上昇に伴い、図2に示される湾曲した初期形状が是正されるように変形する。そして、動作温度に達した熱応動素子5は、図3に示されるように逆反り形状にスナップ変形する。これにより、熱応動素子5が可動片4の弾性部44と接触し、熱応動素子5によって弾性部44が押し上げられて固定接点21と可動接点41とが離隔する。このとき、固定接点21と可動接点41の間を流れていた電流は遮断される。一方、熱応動素子5は、可動片4と接触して、僅かな漏れ電流が熱応動素子5及びPTCサーミスター6を通して流れることとなる。すなわち、PTCサーミスター6は、可動片4を遮断状態に移行させている熱応動素子5を介して、固定片2と可動片4とを導通させる。PTCサーミスター6は、このような漏れ電流の流れる限り発熱を続け、熱応動素子5を逆反り状態に維持させつつ抵抗値を激増させるので、電流は固定接点21と可動接点41の間の経路を流れず、上述の僅かな漏れ電流のみが存在する(自己保持回路を構成する)。この漏れ電流は安全装置の他の機能に充てることができる。
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 thermal response element 5 comes into contact with the elastic portion 44 of the movable piece 4 , and the thermal response 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. On the other hand, 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.
過充電状態を解除し、又は異常状態を解消すると、PTCサーミスター6の発熱も収まり、熱応動素子5は正転復帰温度に戻り、元の初期形状に復元する。そして、可動片4の弾性部44の弾性力によって可動接点41と固定接点21とは再び接触し、回路は遮断状態を解かれ、図2に示す導通状態に復帰する。
When the overcharged state is canceled or the abnormal state is resolved, the heat generation of the PTC thermistor 6 also subsides, and the thermal responsive element 5 returns to the normal rotation return temperature and restores its original initial shape. Then, the elastic force of the elastic portion 44 of the movable piece 4 causes the movable contact 41 and the fixed contact 21 to come into contact with each other again, and the circuit is released from the interrupted state and returns to the conductive state shown in FIG.
図4は、可動片4及びカバー片9が埋設された蓋部材8を示している。可動片4は、端子42と、固定部43を有している。固定部43は、弾性部44と端子42との間に形成されている。固定部43は、カバー片9と共に蓋部材8を構成する樹脂に埋設されて、蓋部材8に固定される。これにより、可動片4と蓋部材8とが一体化される。本実施形態の固定部43は、カバー片9と接触している。これにより、蓋部材8に対する可動片4の姿勢が安定する。
FIG. 4 shows the lid member 8 in which the movable piece 4 and the cover piece 9 are embedded. The movable piece 4 has a terminal 42 and a fixed portion 43 . The fixed portion 43 is formed between the elastic portion 44 and the terminal 42 . The fixed portion 43 is embedded in the resin forming the cover member 8 together with the cover piece 9 and fixed to the cover member 8 . Thereby, the movable piece 4 and the lid member 8 are integrated. The fixing portion 43 of this embodiment is in contact with the cover piece 9 . This stabilizes the posture of the movable piece 4 with respect to the lid member 8 .
蓋部材8は、ケース本体7の側に突出する凸部81と、ケース本体7の反対側に陥没する収容凹部82とを有している。
The lid member 8 has a convex portion 81 protruding toward the case body 7 and a housing recess 82 recessed on the opposite side of the case body 7 .
凸部81は可動片4の固定部43を埋設するために突出している。凸部81が固定部43を埋設することにより、可動片4が蓋部材8に対して正確な位置に固定される。凸部81は、蓋部材8の端子42側の端縁に沿って可動片4の短手方向D1に延びて形成されている。本実施形態の凸部81は、蓋部材8の短手方向D1の端縁まで延びている。
The convex portion 81 protrudes to embed the fixed portion 43 of the movable piece 4 . The movable piece 4 is fixed to the cover member 8 at an accurate position by burying the fixed portion 43 with the convex portion 81 . The convex portion 81 is formed to extend in the lateral direction D1 of the movable piece 4 along the terminal 42 side edge of the lid member 8 . The convex portion 81 of this embodiment extends to the edge of the lid member 8 in the lateral direction D1.
収容凹部82は、可動片4の可動接点41及び弾性部44を収容するために陥没している。蓋部材8に収容凹部82が形成されることにより、可動接点41、弾性部44及びカバー片9は、樹脂ケース10内の内部空間に露出している。
The accommodation recess 82 is recessed to accommodate the movable contact 41 and the elastic portion 44 of the movable piece 4 . The movable contact 41 , the elastic portion 44 and the cover piece 9 are exposed to the internal space inside the resin case 10 by forming the housing recess 82 in the lid member 8 .
図5は、固定片2が埋設されたケース本体7を示している。ケース本体7は、溶着部74及び突出部75を有している。
FIG. 5 shows the case body 7 in which the fixing piece 2 is embedded. The case body 7 has a welded portion 74 and a projecting portion 75 .
溶着部74は、ケース本体7に蓋部材8が装着されたとき、凸部81に対向する位置に配されている。溶着部74は、ケース本体7における可動片4の長手方向D2の端縁から収容凹部73に向かって、平面状に形成されている。溶着部74は、凸部81と溶着され、一体化される。
The welded portion 74 is arranged at a position facing the convex portion 81 when the cover member 8 is attached to the case body 7 . The welded portion 74 is formed in a planar shape from the end edge of the movable piece 4 in the longitudinal direction D<b>2 of the case body 7 toward the housing recess 73 . The welded portion 74 is welded to and integrated with the convex portion 81 .
突出部75は、収容凹部73と溶着部74のうち凸部81と溶着される領域74aとの間に配されている。突出部75は、平面状の溶着部74から蓋部材8の側に突出している。突出部75は、短手方向D1に沿って壁状にのびている。
The protruding portion 75 is arranged between the housing recess 73 and the region 74 a of the welding portion 74 that is welded to the convex portion 81 . The protrusion 75 protrudes from the planar welded portion 74 toward the lid member 8 . The projecting portion 75 extends like a wall along the lateral direction D1.
ケース本体7と蓋部材8との溶着の際には、凸部81及び溶着部74を構成する樹脂が溶融する。本ブレーカー1では、溶融した樹脂が、収容凹部73と溶着部74の領域74aとの間で蓋部材8の側に突出する突出部75によって堰き止められ、収容凹部73への流入が抑制される。これにより、熱応動素子5及び可動片4の動きが円滑となり、安定したブレーカー1の動作が得られる。
When the case main body 7 and the lid member 8 are welded together, the resin forming the protrusion 81 and the welded portion 74 is melted. In the breaker 1, the melted resin is blocked by the projecting portion 75 projecting toward the lid member 8 between the accommodating recess 73 and the region 74a of the welded portion 74, thereby suppressing the flow into the accommodating recess 73. . As a result, the movement of the thermally responsive element 5 and the movable piece 4 becomes smooth, and stable operation of the breaker 1 is obtained.
図4に示されるように、凸部81の先端部には、ケース本体7の側に突出するリブ83が形成されているのが望ましい。凸部81において、リブ83は、短手方向D1に沿って形成されている。ケース本体7と蓋部材8とが溶着される際、リブ83は、溶着部と当接し溶融する。リブ83は、溶着工程での初期段階で容易に溶融し、凸部81と溶着部74との溶着を促進する。これにより、凸部81と溶着部74とが強固に一体化され、例えば、可動片4の端子42に過大な外力が加えられた場合であっても、凸部81と溶着部74との剥離が抑制される。
As shown in FIG. 4, it is desirable that a rib 83 projecting toward the case body 7 is formed at the tip of the projection 81 . A rib 83 is formed in the convex portion 81 along the lateral direction D1. When the case body 7 and the lid member 8 are welded together, the ribs 83 come into contact with the welded portions and are melted. The ribs 83 are easily melted in the initial stage of the welding process, and promote welding between the convex portion 81 and the welding portion 74 . As a result, the projecting portion 81 and the welded portion 74 are firmly integrated, and even if, for example, an excessive external force is applied to the terminal 42 of the movable piece 4, the projecting portion 81 and the welded portion 74 do not separate from each other. is suppressed.
リブ83は、完成したブレーカー1においても、リブ跡(溶着痕)84として確認されうる。例えば、ケース本体7から蓋部材8を剥離してブレーカー1を解体したとき、リブ83は、蓋部材8の凸部81にリブ跡84として確認される。
The ribs 83 can be confirmed as rib traces (welding traces) 84 in the completed breaker 1 as well. For example, when the lid member 8 is peeled off from the case body 7 and the breaker 1 is dismantled, the ribs 83 are confirmed as rib traces 84 on the protrusions 81 of the lid member 8 .
凸部81にリブ83が形成されているブレーカー1では、ケース本体7と蓋部材8との溶着の際に凸部81及び溶着部74においてより多くの樹脂が溶融する。そして、この液状又はゲル状となった樹脂は、収容凹部73に流れ込むおそれがある。しかしながら、本ブレーカー1では、溶融した樹脂は、突出部75によって堰き止められるので、収容凹部73への樹脂の流入が抑制される。
In the breaker 1 in which the ribs 83 are formed on the convex portion 81 , more resin melts in the convex portion 81 and the welding portion 74 when the case body 7 and the lid member 8 are welded together. This liquid or gelled resin may flow into the accommodation recess 73 . However, in the present breaker 1 , the melted resin is blocked by the projecting portion 75 , so that the resin is prevented from flowing into the housing recess 73 .
リブ83は、蓋部材8の外縁に沿って一周に亘って連続的に延長されるのが望ましい。本実施形態では、リブ83は、凸部81に形成された第1部83aと凸部81以外に形成された第2部83bとを有している。これにより、ケース本体7と蓋部材8とが、樹脂ケース10の外縁に沿って連続的に良好に溶着され、樹脂ケース10の密閉性が高められる。なお、このようなブレーカー1では、リブ跡84は、蓋部材8の外縁に沿って一周に亘って連続的に形成される。
It is desirable that the ribs 83 extend continuously along the outer edge of the lid member 8 all the way around. In this embodiment, the rib 83 has a first portion 83a formed on the convex portion 81 and a second portion 83b formed outside the convex portion 81. As shown in FIG. As a result, the case main body 7 and the lid member 8 are welded continuously and satisfactorily along the outer edge of the resin case 10, and the sealing performance of the resin case 10 is enhanced. In addition, in such a breaker 1 , the rib traces 84 are continuously formed along the outer edge of the lid member 8 over the entire circumference.
蓋部材8の外縁に沿った単位長さあたりの第1部83aの体積は、蓋部材8の外縁に沿った単位長さあたりの第2部83bの体積よりも大きい、のが望ましい。これにより、凸部81と溶着部74とがより一層強固に一体化され、凸部81と溶着部74との剥離がより一層抑制される。良好に溶着され、樹脂ケース10の密閉性が高められる。なお、このようなブレーカー1では、リブ跡84は、凸部81に形成された第1部84aと凸部81以外に形成された第2部84bとを含む。そして、蓋部材8の外縁に沿った単位長さあたりの第1部84aの体積は、蓋部材8の外縁に沿った単位長さあたりの第2部84bの体積よりも大きくなる。
It is desirable that the volume of the first portion 83a per unit length along the outer edge of the lid member 8 is larger than the volume of the second portion 83b per unit length along the outer edge of the lid member 8. As a result, the convex portion 81 and the welded portion 74 are more firmly integrated, and separation between the convex portion 81 and the welded portion 74 is further suppressed. Good welding is achieved, and the sealing performance of the resin case 10 is enhanced. Note that, in the breaker 1 as described above, the rib mark 84 includes a first portion 84a formed on the convex portion 81 and a second portion 84b formed outside the convex portion 81. As shown in FIG. The volume of the first portion 84 a per unit length along the outer edge of the lid member 8 is larger than the volume of the second portion 84 b per unit length along the outer edge of the lid member 8 .
図5に示されるように、リブ跡76は、ケース本体7の溶着部74においても確認されうる。同図では、リブ跡76はドット状のハッチングにて示されている。上述したリブ跡84と同様に、リブ跡76は、ケース本体7の外縁に沿って連続的に延長されるのが望ましい。また、リブ跡76は、溶着部74に形成された第1部76aと溶着部74以外に形成された第2部76bとを含み、ケース本体7の外縁に沿った単位長さあたりの第1部76aの体積は、ケース本体7の外縁に沿った単位長さあたりの第2部76bの体積よりも大きくなる、のが望ましい。
As shown in FIG. 5, the rib mark 76 can also be confirmed at the welded portion 74 of the case body 7. In the figure, the rib marks 76 are indicated by dotted hatching. Like the rib marks 84 described above, the rib marks 76 preferably extend continuously along the outer edge of the case body 7 . Further, the rib mark 76 includes a first portion 76 a formed in the welded portion 74 and a second portion 76 b formed outside the welded portion 74 , and is the first portion per unit length along the outer edge of the case main body 7 . The volume of the portion 76a is preferably greater than the volume of the second portion 76b per unit length along the outer edge of the case body 7.
なお、蓋部材8に形成されるリブ83に替えて、ケース本体7の溶着部74及び外縁に沿ってリブ(図示せず)が形成されていてもよい。この場合においても、ケース本体7及び/又は蓋部材8に上記と同等のリブ跡76及び/又はリブ跡84が形成される。
Instead of the ribs 83 formed on the lid member 8, ribs (not shown) may be formed along the welded portion 74 and the outer edge of the case body 7. Also in this case, the case main body 7 and/or the lid member 8 are formed with rib traces 76 and/or rib traces 84 similar to those described above.
図6は、図2における溶着部74、突出部75、凸部81及びその周辺を拡大して示している。ブレーカー1では、突出部75とリブ跡との間に、樹脂溜め部77を有する、のが望ましい。本実施形態の樹脂溜め部77は、凸部81と突出部75との間に設けられている。
FIG. 6 shows an enlarged view of the welded portion 74, the projecting portion 75, the projecting portion 81 and their surroundings in FIG. It is desirable that the breaker 1 has a resin reservoir 77 between the protrusion 75 and the trace of the rib. The resin reservoir portion 77 of this embodiment is provided between the convex portion 81 and the projecting portion 75 .
樹脂溜め部77は、凸部81と溶着部74との溶着に伴って溶融した樹脂を収容する。これにより、溶融した樹脂の収容凹部73への流入がより一層抑制され、熱応動素子5及び可動片4の動きが円滑となり、安定したブレーカー1の動作が得られる。
The resin reservoir portion 77 accommodates the resin melted as the convex portion 81 and the welding portion 74 are welded together. As a result, the flow of molten resin into the housing recess 73 is further suppressed, the movement of the thermally responsive element 5 and the movable piece 4 becomes smoother, and the breaker 1 operates stably.
樹脂溜め部77は、溶着部74の形成面74bから陥没していてもよい。このような形態では、樹脂溜め部77の容積が容易に大きくされうる。従って、リブ83の第1部83aの体積を容易に大きくすることが可能となり、凸部81と溶着部74とがより一層強固に一体化されうる。
The resin reservoir portion 77 may be recessed from the formation surface 74b of the welding portion 74. With such a configuration, the volume of the resin reservoir 77 can be easily increased. Therefore, the volume of the first portion 83a of the rib 83 can be easily increased, and the convex portion 81 and the welding portion 74 can be more firmly integrated.
図6に示されるように、突出部75の先端と可動片4との間には隙間(クリアランス)78が設けられている、のが望ましい。このような構成によれば、突出部75と可動片4との接触が回避され、ケース本体7と蓋部材8との溶着時における振動による突出部75の切削(損傷)が抑制される。従って、切削粉の発生及び収容凹部73への侵入が抑制される。
As shown in FIG. 6, it is desirable that a gap (clearance) 78 is provided between the tip of the projecting portion 75 and the movable piece 4 . With such a configuration, contact between the projecting portion 75 and the movable piece 4 is avoided, and cutting (damage) of the projecting portion 75 due to vibration when the case body 7 and the lid member 8 are welded together is suppressed. Therefore, generation of cutting powder and entry into the housing recess 73 are suppressed.
図7は、図3、すなわち、熱により熱応動素子5が変形している状態での溶着部74、突出部75、凸部81及びその周辺を拡大して示している。ブレーカー1では、突出部75は、熱変形時の熱応動素子5よりも蓋部材8の側に突出している、のが望ましい。本実施形態では、可動片4の弾性部44に形成された突起44aが熱応動素子5と当接することと相俟って、突出部75の先端が熱応動素子5の後端(端子42側の端縁)5aよりも可動片4の側(同図において上側)まで延出されている。このような構成によれば、熱変形時の熱応動素子5が端子42の側に移動して、後端5aが隙間78に侵入することが抑制される。
FIG. 7 is an enlarged view of the welded portion 74, the protruding portion 75, the protruding portion 81 and their surroundings in FIG. In the breaker 1, it is desirable that the protruding portion 75 protrudes toward the lid member 8 from the thermally responsive element 5 during thermal deformation. In this embodiment, the projection 44a formed on the elastic portion 44 of the movable piece 4 abuts against the thermal responsive element 5, so that the tip of the projecting portion 75 is positioned at the rear end of the thermal responsive element 5 (on the side of the terminal 42). edge) 5a to the side of the movable piece 4 (upper side in the figure). According to such a configuration, it is possible to prevent the rear end 5a of the thermally responsive element 5 from moving toward the terminal 42 and entering the gap 78 during thermal deformation.
図4に示されるように、本実施形態の蓋部材8は、凸部81から可動接点41の側に突出する突出部88を含んでいてもよい。突出部88が設けられることにより、カバー片9と突出部88とによって可動片4が挟み込まれ、蓋部材8に対して可動片4が強固かつ正確な位置で固定される。
As shown in FIG. 4, the lid member 8 of this embodiment may include a projecting portion 88 projecting from the projecting portion 81 toward the movable contact 41 side. 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.
以上、本発明のブレーカー1が詳細に説明されたが、本発明は上記の具体的な実施形態に限定されることなく種々の態様に変更して実施される。
Although the breaker 1 of the present invention has been described in detail above, the present invention is not limited to the above-described specific embodiments, and can be implemented with various modifications.
すなわち、本発明のブレーカー1は、少なくとも、固定接点21と、板状に形成され、弾性変形する弾性部44及び該弾性部44の一端部に可動接点41を有し、可動接点41を固定接点21に押圧して接触させる可動片4と、温度変化に伴って変形することにより、可動片4を可動接点41が固定接点21に接触する導通状態から可動接点41が固定接点21から離隔する遮断状態に移行させる熱応動素子5と、固定接点21、及び熱応動素子5を収容するための収容凹部73が形成されたケース本体7と、可動片4と一体化され、ケース本体7に固着されて収容凹部73を覆う蓋部材8とを備えたブレーカー1であって、可動片4は、蓋部材8の外側に突出し、外部回路に接続される端子42と、弾性部44と端子42との間で蓋部材8に埋設されて固定される固定部43を有し、蓋部材8は、固定部43を埋設するためにケース本体7の側に突出する凸部81を有し、ケース本体7は、凸部81と溶着される溶着部74及び収容凹部73と溶着部74との間で蓋部材8の側に突出する突出部75を有していればよい。
That is, the breaker 1 of the present invention has at least a fixed contact 21, an elastic portion 44 formed in a plate shape and elastically deformable, and a movable contact 41 at one end of the elastic portion 44. The movable contact 41 is a fixed contact. The movable piece 4 is pressed and brought into contact with the fixed contact 21, and the movable piece 4 is deformed with a change in temperature to break the movable contact 41 away from the fixed contact 21 from the conductive state in which the movable contact 41 contacts the fixed contact 21. A case body 7 formed with a thermally responsive element 5 to shift to a state, a fixed contact 21, and a housing recess 73 for housing the thermally responsive element 5 is integrated with the movable piece 4 and fixed to the case body 7. The breaker 1 includes a lid member 8 that covers the housing recess 73 , and the movable piece 4 protrudes outside the lid member 8 and connects a terminal 42 connected to an external circuit and an elastic portion 44 and the terminal 42 . The lid member 8 has a fixing portion 43 embedded and fixed in the lid member 8 between the lid member 8 and the lid member 8. may have a welding portion 74 welded to the projection 81 and a projecting portion 75 projecting toward the lid member 8 between the receiving recess 73 and the welding portion 74 .
例えば、可動片4をバイメタル又はトリメタル等の積層金属によって形成することにより、可動片4と熱応動素子5を一体的に形成する構成であってもよい。この場合、ブレーカー1等の構成が簡素化される。
For example, the movable piece 4 and the thermally responsive element 5 may be integrally formed by forming the movable piece 4 from a laminated metal such as bimetal or trimetal. In this case, the configuration of the breaker 1 and the like is simplified.
また、本実施形態では、PTCサーミスター6による自己保持回路を有しているが、このような構成を省いた形態であっても適用可能である。
In addition, although the present embodiment has a self-holding circuit using the PTC thermistor 6, it is also possible to apply a form in which such a configuration is omitted.
また、本発明のブレーカー1等は、2次電池パック、電気機器用の安全回路等にも広く適用できる。図8は2次電池パック500を示す。2次電池パック500は、2次電池501と、2次電池501の出力回路中に設けたブレーカー1とを備える。図9は電気機器用の安全回路502を示す。安全回路502は2次電池501の出力回路中に直列にブレーカー1を備えている。ブレーカー1を備えた2次電池パック500又は安全回路502によれば、安定した導通が得られる2次電池パック500又は安全回路502を実現できる。
In addition, the breaker 1 and the like of the present invention can be widely applied to secondary battery packs, safety circuits for electrical equipment, and the like. FIG. 8 shows a secondary battery pack 500. As shown in FIG. A secondary battery pack 500 includes a secondary battery 501 and a breaker 1 provided in an output circuit of the secondary battery 501 . FIG. 9 shows a safety circuit 502 for electrical equipment. The safety circuit 502 has a breaker 1 in series in the output circuit of the secondary battery 501 . According to the secondary battery pack 500 or the safety circuit 502 having the breaker 1, it is possible to realize the secondary battery pack 500 or the safety circuit 502 in which stable conduction is obtained.
1 :ブレーカー
4 :可動片
5 :熱応動素子
6 :PTCサーミスター(熱応動素子)
7 :ケース本体(第1樹脂ケース)
8 :蓋部材(第2樹脂ケース)
10 :樹脂ケース
21 :固定接点
41 :可動接点
42 :端子
43 :固定部
44 :弾性部
73 :収容凹部
74 :溶着部
74b :形成面
75 :突出部
76 :リブ跡
77 :樹脂溜め部
78 :隙間
81 :凸部
82 :収容凹部
84 :リブ跡
88 :突出部
500 :2次電池パック
502 :安全回路 1: Breaker 4: Movable piece 5: Thermal response element 6: PTC thermistor (thermal response element)
7: Case body (first resin case)
8: Lid member (second resin case)
10 : Resin case 21 : Fixed contact 41 : Movable contact 42 : Terminal 43 : Fixed part 44 : Elastic part 73 : Receiving recess 74 :Welding part 74b : Forming surface 75 : Protruding part 76 : Rib marks 77 : Resin reservoir 78 : Gap 81 : Convex portion 82 : Accommodating concave portion 84 : Rib marks 88 : Projecting portion 500 : Secondary battery pack 502 : Safety circuit
4 :可動片
5 :熱応動素子
6 :PTCサーミスター(熱応動素子)
7 :ケース本体(第1樹脂ケース)
8 :蓋部材(第2樹脂ケース)
10 :樹脂ケース
21 :固定接点
41 :可動接点
42 :端子
43 :固定部
44 :弾性部
73 :収容凹部
74 :溶着部
74b :形成面
75 :突出部
76 :リブ跡
77 :樹脂溜め部
78 :隙間
81 :凸部
82 :収容凹部
84 :リブ跡
88 :突出部
500 :2次電池パック
502 :安全回路 1: Breaker 4: Movable piece 5: Thermal response element 6: PTC thermistor (thermal response element)
7: Case body (first resin case)
8: Lid member (second resin case)
10 : Resin case 21 : Fixed contact 41 : Movable contact 42 : Terminal 43 : Fixed part 44 : Elastic part 73 : Receiving recess 74 :
Claims (11)
- 固定接点と、
板状に形成され、弾性変形する弾性部及び該弾性部の一端部に可動接点を有し、前記可動接点を前記固定接点に押圧して接触させる可動片と、
温度変化に伴って変形することにより、前記可動片を前記可動接点が前記固定接点に接触する導通状態から前記可動接点が前記固定接点から離隔する遮断状態に移行させる熱応動素子と、
前記固定接点、及び前記熱応動素子を収容するための収容凹部が形成された第1樹脂ケースと、
前記可動片と一体化され、前記第1樹脂ケースに固着されて前記収容凹部を覆う第2樹脂ケースとを備えたブレーカーであって、
前記可動片は、前記第2樹脂ケースの外側に突出し、外部回路に接続される端子と、前記弾性部と前記端子との間で前記第2樹脂ケースに埋設されて固定される固定部を有し、
前記第2樹脂ケースは、前記固定部を埋設するために前記第1樹脂ケースの側に突出する凸部を有し、
前記第1樹脂ケースは、前記凸部と溶着される溶着部及び前記収容凹部と前記溶着部との間で前記第2樹脂ケースの側に突出する突出部を有する、
ブレーカー。 a fixed contact;
a movable piece that is formed in a plate shape and has an elastic portion that is elastically deformable and 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;
a thermally responsive element that deforms with a change in temperature to shift the movable piece from a conductive state in which the movable contact is in contact with the fixed contact to a disconnected state in which the movable contact is separated from the fixed contact;
a first resin case formed with a housing recess for housing the fixed contact and the thermally responsive element;
A breaker comprising: a second resin case integrated with the movable piece and fixed to the first resin case to cover the accommodating recess,
The movable piece has a terminal that protrudes outside the second resin case and is connected to an external circuit, and a fixed portion that is embedded and fixed in the second resin case between the elastic portion and the terminal. death,
The second resin case has a convex portion protruding toward the first resin case for embedding the fixing portion,
The first resin case has a welding portion that is welded to the convex portion and a projecting portion that projects toward the second resin case between the housing recess and the welding portion,
breaker. - 前記凸部の先端部には、前記溶着部と当接し溶融したリブ跡が形成されている、請求項1に記載のブレーカー。 The breaker according to claim 1, wherein the tip of the convex portion is formed with a rib trace that has been melted by coming into contact with the welded portion.
- 前記リブ跡は、前記第2樹脂ケースの外縁に沿って連続的に延長され、前記凸部に形成された第1部と前記凸部以外に形成された第2部とを有し、
前記外縁に沿った単位長さあたりの前記第1部の体積は、前記単位長さあたりの前記第2部の体積よりも大きい、請求項2に記載のブレーカー。 The rib mark continuously extends along the outer edge of the second resin case and has a first portion formed on the convex portion and a second portion formed outside the convex portion,
3. The breaker of claim 2, wherein the volume of said first portion per unit length along said outer edge is greater than the volume of said second portion per unit length. - 前記溶着部には、前記凸部の先端部と当接し溶融したリブ跡が形成されている、請求項1に記載のブレーカー。 The breaker according to claim 1, wherein the welded portion is formed with a rib mark that is melted by coming into contact with the tip of the convex portion.
- 前記リブ跡は、前記第1樹脂ケースの外縁に沿って連続的に延長され、前記溶着部に形成された第1部と前記溶着部以外に形成された第2部とを有し、
前記外縁に沿った単位長さあたりの前記第1部の体積は、前記単位長さあたりの前記第2部の体積よりも大きい、請求項4に記載のブレーカー。 The rib mark continuously extends along the outer edge of the first resin case, and has a first portion formed at the welded portion and a second portion formed outside the welded portion,
5. The breaker of claim 4, wherein the volume of said first portion per unit length along said outer edge is greater than the volume of said second portion per unit length. - 前記突出部と前記リブ跡との間に、樹脂溜め部を有する、請求項2ないし5のいずれかに記載のブレーカー。 The breaker according to any one of claims 2 to 5, which has a resin reservoir between the protrusion and the rib mark.
- 前記樹脂溜め部は、前記溶着部の形成面から陥没している、請求項6記載のブレーカー。 The breaker according to claim 6, wherein the resin reservoir is recessed from the surface on which the welded portion is formed.
- 前記突出部の先端と前記可動片との間に隙間が設けられている、請求項1ないし7のいずれかに記載のブレーカー。 The breaker according to any one of claims 1 to 7, wherein a gap is provided between the tip of said protrusion and said movable piece.
- 前記突出部は、変形時の前記熱応動素子よりも前記第2樹脂ケースの側に突出している、請求項1ないし8のいずれかに記載のブレーカー。 The breaker according to any one of claims 1 to 8, wherein the protrusion protrudes toward the second resin case from the thermally responsive element when deformed.
- 請求項1ないし9のいずれかに記載のブレーカーを備える、電気機器用の安全回路。 A safety circuit for electrical equipment, comprising the breaker according to any one of claims 1 to 9.
- 請求項1ないし9のいずれかに記載のブレーカーを備える、2次電池パック。 A secondary battery pack comprising the breaker according to any one of claims 1 to 9.
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- 2022-10-31 WO PCT/JP2022/040678 patent/WO2023119887A1/en unknown
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5275071U (en) * | 1975-12-03 | 1977-06-04 | ||
JPS57173221U (en) * | 1981-04-27 | 1982-11-01 | ||
WO2011105175A1 (en) * | 2010-02-26 | 2011-09-01 | 株式会社小松ライト製作所 | Breaker |
JP2013222533A (en) * | 2012-04-13 | 2013-10-28 | Komatsulite Mfg Co Ltd | Breaker, safety circuit including the same, and secondary battery |
JP2016054124A (en) * | 2014-09-04 | 2016-04-14 | 株式会社小松ライト製作所 | Breaker, and safety circuit and secondary battery circuit having the same |
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JP2023091404A (en) | 2023-06-30 |
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