WO2020121896A1 - 熱応動素子、ブレーカー、安全回路及び２次電池パック - Google Patents

熱応動素子、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
WO2020121896A1
WO2020121896A1 PCT/JP2019/047242 JP2019047242W WO2020121896A1 WO 2020121896 A1 WO2020121896 A1 WO 2020121896A1 JP 2019047242 W JP2019047242 W JP 2019047242W WO 2020121896 A1 WO2020121896 A1 WO 2020121896A1
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WO
WIPO (PCT)
Prior art keywords
region
breaker
thermoresponsive
curvature
temperature
Prior art date
Application number
PCT/JP2019/047242
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English (en)
French (fr)
Japanese (ja)
Inventor
恒平 山本
Original Assignee
ボーンズ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by ボーンズ株式会社 filed Critical ボーンズ株式会社
Priority to CN201980077924.2A priority Critical patent/CN113168991B/zh
Publication of WO2020121896A1 publication Critical patent/WO2020121896A1/ja

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    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/32—Thermally-sensitive members
    • H01H37/52—Thermally-sensitive members actuated due to deflection of bimetallic element
    • H01H37/54—Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting

Definitions

  • the present invention relates to a heat responsive element or the like formed in a plate shape suitable for use in a small breaker.
  • breakers have been used as protective devices (safety circuits) for secondary batteries and motors of various electric devices.
  • Patent Document 1 discloses a breaker to which a bimetal is applied as a heat responsive element.
  • the bimetal is an element that is formed by laminating two kinds of plate-shaped metal materials having different thermal expansion coefficients, and changes the shape according to the temperature change (thermal deformation) to control the conduction state of the contacts.
  • parts such as a fixed piece, a movable piece, a thermo-responsive element, and a PTC thermistor are housed in a case, and the terminals of the fixed piece and the terminal piece protrude from the case, so that the electric device Used by being connected to a circuit.
  • the breaker operates when the temperature of the rechargeable battery during charging/discharging rises excessively, or when an abnormal condition occurs, such as when an overcurrent flows through a motor or the like installed in equipment such as automobiles and home appliances. Shut off the current to protect the secondary battery and motor.
  • the breaker used as such a protection device operates accurately following a temperature change (has good temperature characteristics) and has a stable resistance value when energized in order to ensure the safety of the device. Required to be present.
  • the breaker when used as a protection device for a secondary battery or the like equipped in an electric device such as a notebook personal computer, a tablet type personal digital assistant, or a thin multifunctional mobile phone called a smartphone, the above-mentioned breaker is used.
  • miniaturization is required.
  • users are strongly interested in making them smaller (thinner), and devices newly released by various companies are designed to be small in size in order to secure superiority in design. The tendency to be done is remarkable.
  • thermoresponsive element has a normal rotation shape.
  • the snap-action causes the heat-responsive element to change to an inverted shape (reverse warp shape) as shown in FIG. 4 of the document, and pushes up near the tip of the movable piece.
  • the fixed contact provided on the fixed piece and the movable contact provided on the movable piece are separated from each other, and the breaker is turned off.
  • thermo-responsive element After that, when the overcharged state is eliminated, the temperature of the thermo-responsive element will drop, the thermo-responsive element will return to the normal shape, and the movable piece will return to the conducting state.
  • the reversal operating temperature of the thermal response element for moving the movable piece from the conductive state to the cutoff state and the forward rotation return temperature of the thermal response element for returning the breaker from the cutoff state to the conductive state are the values of the equipment on which the breaker is mounted. It is set according to specifications.
  • thermoresponsive element is formed in a curved shape that is convex toward the movable piece so that the normal return temperature is lower than the reversal operation temperature of the thermoresponsive element.
  • thermoresponsive element To set the normal rotation return temperature even lower, the radius of curvature of the thermoresponsive element should be reduced.
  • the forward rotation return temperature tends to vary, and in particular, in the case of a breaker in pursuit of miniaturization, it is not possible to manufacture a thermo-responsive element with a small radius of curvature with stable quality. This is a cause of the decrease in yield due to difficulties. Therefore, there is a demand for the development of a thermoresponsive element that can increase the difference between the reversal operation temperature and the normal rotation recovery temperature without making the radius of curvature excessively small relative to the size of the thermoresponsive element.
  • the present invention has been made to solve the above problems, and an object thereof is to provide a thermal responsive element or the like in which the difference between the reversal operation temperature and the normal rotation return temperature is large without making the radius of curvature excessively small.
  • the present invention relates to a thermally responsive element formed in a curved plate shape, which is integrally formed from a first region that deforms with a snap action according to a temperature change, and the first region.
  • a second region which is formed and inhibits deformation of the first region, the second region being formed inside a circumscribed circle of the first region.
  • the heat responsive element is formed in a rectangular shape in a plan view as seen from the thickness direction, and the first region is formed on two diagonal lines.
  • thermoresponsive element when viewed in a plan view from the thickness direction, it is formed in a rectangular shape having a long side extending in the length direction and a short side extending in the width direction perpendicular to the length direction. It is preferable that the second region is formed along the long side.
  • thermoresponsive element when viewed in a plan view from the thickness direction, it is formed in a rectangular shape having a long side extending in the length direction and a short side extending in the width direction perpendicular to the length direction. It is preferable that the second region is formed along the short side.
  • thermoresponsive element it is desirable that the radius of curvature of the second region is larger than the radius of curvature of the first region.
  • thermoresponsive element it is desirable that the center of curvature of the second region is located on the opposite side of the center of curvature of the first region with the thermoresponsive element interposed therebetween.
  • the breaker of the present invention has the thermal responsive element, a fixed contact, an elastic portion that elastically deforms, and a movable contact at the tip of the elastic portion, and presses the movable contact against the fixed contact.
  • a safety circuit for electric equipment of the present invention is characterized by including the breaker.
  • a secondary battery pack for electric equipment of the present invention is characterized by including the breaker.
  • the thermoresponsive element includes a first region that is deformed with a snap action according to a temperature change, and a second region that is integrally formed from the first region and that inhibits the deformation of the first region.
  • the first region generates a stress for deforming from the normal rotation shape to the inverted shape as the temperature of the thermoresponsive element rises.
  • the second region acts to prevent the deformation of the first region from the normal shape to the inverted shape and maintain the normal shape.
  • the stress required to deform the thermo-responsive element into the inverted shape is increased, and the reversal operating temperature of the thermo-responsive element is easily increased.
  • the second region acts so as to prevent the deformation of the first region from the inverted shape to the normal shape and maintain the inverted shape.
  • the stress required to deform the thermoresponsive element into the normal shape is increased, and the normal return temperature at which the thermoresponsive element snaps into the normal shape is lowered. Therefore, the normal rotation return temperature of the heat-responsive element can be easily lowered, and the difference between the reversal operation temperature and the normal rotation return temperature can be easily increased without excessively reducing the radius of curvature of the heat-responsive element. Become.
  • the second area is formed inside the circumscribed circle of the first area. This makes it possible to increase the difference between the reversal operation temperature and the normal rotation return temperature without increasing the size of the heat responsive element.
  • the perspective view before an assembly showing the schematic structure of the breaker by one embodiment of the present invention Sectional drawing which shows the said breaker in a normal charge or discharge state. Sectional drawing which shows the said breaker at the time of an overcharge state or an abnormality.
  • the top view of another modification of the said thermoresponsive element The top view of another modification of the above-mentioned thermal response element.
  • the top view of another modification of the above-mentioned thermal response element The top view of another modification of the above-mentioned thermal response element.
  • a breaker according to an embodiment of the present invention will be described with reference to the drawings.
  • 1 to 3 show the configuration of the breaker 1.
  • the breaker 1 is mounted on an electric device or the like and protects the electric device from an excessive temperature rise or an overcurrent.
  • the breaker 1 includes a fixed piece 2 having a fixed contact 21, a movable piece 4 having a movable contact 41 at its tip, a thermal responsive element 5 that deforms with a temperature change, and a PTC (Positive Temperature Coefficient) thermistor 6.
  • the case 10 includes a case body (first case) 7, a lid member (second case) 8 mounted on the upper surface of the case body 7, and the like.
  • the fixing piece 2 is formed, for example, by pressing a metal plate containing copper as a main component (other than this, a metal plate of copper-titanium alloy, nickel silver, brass, etc.), and is insert-molded into the case body 7. It is embedded.
  • a terminal 22 that is electrically connected to an external circuit is formed at one end of the fixed piece 2, and a support portion 23 that supports the PTC thermistor 6 is formed at the other end side.
  • the PTC thermistor 6 is mounted on convex protrusions (doughs) 24 formed at three locations on the support portion 23 of the fixed piece 2 and supported by the protrusions 24.
  • the fixed contact 21 is formed at a position facing the movable contact 41 by clad, plating or coating of a material having good conductivity such as silver, nickel, nickel-silver alloy, copper-silver alloy, gold-silver alloy. It is exposed from a part of the opening 73a formed inside the case body 7.
  • the terminal 22 is projected outward from the edge of the case body 7.
  • the support portion 23 is exposed from an opening 73d formed inside the case body 7.
  • the surface on the side where the fixed contact 21 is formed (that is, the upper surface in FIG. 1) is the A surface, and the opposite surface is the B surface. doing.
  • the direction from the fixed contact 21 to the movable contact 41 is defined as the first direction and the direction opposite to the first direction is defined as the second direction
  • the A surface faces the first direction
  • the B surface faces the second direction.
  • the movable piece 4 is formed into an arm shape symmetrical with respect to the center line in the longitudinal direction by pressing a plate-shaped metal material containing copper or the like as a main component.
  • a movable contact 41 is formed at the tip of the movable piece 4 in the longitudinal direction.
  • the movable contact 41 is formed of, for example, a material similar to that of the fixed contact 21, and is joined to the tip end of the movable piece 4 by a method such as welding, clad, crimping, or the like.
  • a terminal 42 electrically connected to an external circuit is formed at the other end of the movable piece 4 in the longitudinal direction.
  • the movable piece 4 has a contact portion 43 and an elastic portion 44 between the movable contact 41 and the terminal 42.
  • the contact portion 43 contacts the case body 7 and the lid member 8 between the terminal 42 and the elastic portion 44.
  • the contact portion 43 has a protruding portion 43a that protrudes like a wing in the lateral direction of the movable piece 4. Since the protrusion 43a is provided, the contact portion 43 is sandwiched between the case body 7 and the lid member 8 in a wide and large area, and the movable piece 4 is firmly fixed to the case 10.
  • the elastic portion 44 extends from the contact portion 43 to the movable contact 41 side.
  • the movable piece 4 is cantilevered by the case 10 at the abutment portion 43 on the proximal end side of the elastic portion 44, and is elastically deformed in this state to be formed at the tip portion of the elastic portion 44.
  • the movable contact 41 that is present is pressed against the side of the fixed contact 21 and comes into contact with it, so that the fixed piece 2 and the movable piece 4 can be energized.
  • the movable piece 4 is curved or bent in the elastic portion 44 by press working.
  • a pair of protrusions 44 a and 44 b are formed on the lower surface of the elastic portion 44 so as to face the thermoresponsive element 5.
  • the protrusion 44a protrudes toward the heat responsive element 5 at the base end side and contacts the heat responsive element 5 in a blocked state.
  • the protrusion 44b protrudes toward the heat responsive element 5 on the tip side (that is, the movable contact 41 side) of the protrusion 44a, and contacts the heat responsive element 5 in a blocked state.
  • the thermal responsive element 5 When the thermal responsive element 5 is deformed by overheating, the thermal responsive element 5 contacts the protrusions 44a and 44b, the deformation of the thermal responsive element 5 is transmitted to the elastic portion 44 via the protrusions 44a and 44b, and the movable piece 4 moves. The tip is pushed up (see Fig. 3).
  • the heat responsive element 5 shifts the state of the movable piece 4 from a conductive state in which the movable contact 41 contacts the fixed contact 21 to a cutoff state in which the movable contact 41 is separated from the fixed contact 21.
  • the heat responsive element 5 is formed in a plate shape by laminating thin plate materials having different thermal expansion coefficients, and has an initial shape in which a cross section is curved in an arc shape. When the reversing operation temperature is reached due to overheating, the curved shape of the heat responsive element 5 warps backward with snap motion, and is restored when the temperature falls below the normal return temperature due to cooling.
  • the initial shape of the thermoresponsive element 5 can be formed by press working.
  • thermoresponsive element 5 are not particularly limited as long as the elastic portion 44 of the movable piece 4 is pushed up by the reverse warp deformation of the thermoresponsive element 5 at the desired temperature and returned to its original state by the elastic force of the elastic portion 44.
  • a rectangular shape is preferable from the viewpoint of productivity and efficiency of reverse warp deformation.
  • thermoresponsive element 5 As the material of the heat-responsive element 5, two kinds of materials having different coefficients of thermal expansion, which are made of various alloys such as nickel silver, brass and stainless steel, are laminated and used in combination according to the required conditions.
  • a material of the thermoresponsive element 5 that can obtain a stable reversal operation temperature and a normal reversion temperature it is desirable to combine a copper-nickel-manganese alloy on the high expansion side and an iron-nickel alloy on the low expansion side.
  • a material in which an iron-nickel-chromium alloy is combined on the high expansion side and an iron-nickel alloy is combined on the low expansion side can be mentioned.
  • there 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 there 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 when the movable piece 4 is in the cutoff state.
  • the PTC thermistor 6 is arranged between the fixed piece 2 and the thermoresponsive element 5. That is, the support portion 23 of the fixed piece 2 is located immediately below the thermoresponsive element 5 with the PTC thermistor 6 interposed therebetween.
  • the type of the PTC thermistor 6 can be selected depending on the operating current, operating voltage, operating temperature, return temperature, etc.
  • the material and shape are not particularly limited as long as these characteristics are not impaired.
  • a ceramic sintered body containing barium titanate, strontium titanate or calcium titanate is used.
  • so-called polymer PTC in which conductive particles such as carbon are contained in polymer may be used.
  • the case body 7 and the lid member 8 constituting the case 10 are formed of a thermoplastic resin such as flame-retardant polyamide, polyphenylene sulfide (PPS) having excellent heat resistance, liquid crystal polymer (LCP), and polybutylene terephthalate (PBT). Has been done. A material other than the resin may be applied as long as the characteristics equal to or higher than those of the resin described above are obtained.
  • a thermoplastic resin such as flame-retardant polyamide, polyphenylene sulfide (PPS) having excellent heat resistance, liquid crystal polymer (LCP), and polybutylene terephthalate (PBT).
  • the case main body 7 is formed with a recess 73 which is an internal space for housing the movable piece 4, the thermoresponsive element 5, the PTC thermistor 6, and the like.
  • the recess 73 has openings 73a and 73b for accommodating the movable piece 4, an opening 73c for accommodating the movable piece 4 and the thermoresponsive element 5, an opening 73d for accommodating the PTC thermistor 6, and the like. ing.
  • the edges of the movable piece 4 and the heat responsive element 5 incorporated in the case body 7 are brought into contact with each other by the frame forming the recess 73, and are guided when the heat responsive element 5 is warped and deformed.
  • the lid member 8 is configured to cover the recess 73.
  • the lid member 8 may be configured to cover at least a part of the recess 73.
  • a metal plate containing copper or the like as a main component or a metal plate such as stainless steel may be embedded in the lid member 8 by insert molding. The metal plate appropriately contacts the surface A of the movable piece 4 to restrict the movement of the movable piece 4, and contributes to the downsizing of the breaker 1 while enhancing the rigidity and strength of the lid member 8 and thus the case 10 as a housing. To do.
  • the lid member 8 covers the case 73 so as to close the openings 73a, 73b, 73c and the like of the case body 7 that houses the fixed piece 2, the movable piece 4, the thermoresponsive element 5, the PTC thermistor 6 and the like. It is attached to the main body 7.
  • the case body 7 and the lid member 8 are joined by ultrasonic welding, for example.
  • FIG. 2 shows the operation of the breaker 1 in a normal charging or discharging state.
  • the thermoresponsive element 5 maintains the initial shape before reverse warpage.
  • the thermal responsive element 5 may be separated from the protrusions 44a and 44b of the movable piece 4 in the conductive state. As a result, the contact pressure between the movable contact 41 and the fixed contact 21 is increased, and the contact resistance between them is reduced.
  • FIG. 3 shows the operation of the breaker 1 in the overcharged state or the abnormal state.
  • the thermal responsive element 5 that has reached the reversing operation temperature is reversely warped and comes into contact with the elastic portion 44 of the movable piece 4, and the elastic portion 44 is pushed up and fixed contact 21 and movable contact. 41 is separated. At this time, the current flowing between the fixed contact 21 and the movable contact 41 is cut off.
  • the thermoresponsive element 5 comes into contact with the movable piece 4, and a slight leakage current flows through the thermoresponsive element 5 and the PTC thermistor 6.
  • the PTC thermistor 6 brings the fixed piece 2 and the movable piece 4 into conduction with each other via the thermal responsive element 5 that moves the movable piece 4 to the cutoff state.
  • the PTC thermistor 6 continues to generate heat as long as such a leakage current flows, and dramatically increases the resistance value while maintaining the thermoresponsive element 5 in the reverse warped state, so that the current passes through the path between the fixed contact 21 and the movable contact 41. Does not flow through and there is only the above-mentioned slight leakage current (constituting a self-holding circuit). This leakage current can be used for other functions of the safety device.
  • FIG. 4 shows the thermoresponsive element 5.
  • the thermoresponsive element 5 is formed in a curved plate shape.
  • the thermoresponsive element 5 includes a first region 51 that deforms with a snap action due to a temperature change, and a second region 52 that inhibits the deformation of the first region 51.
  • the deformation accompanied by the snap action is a deformation (hereinafter referred to as a snap deformation) which occurs instantaneously when the thermoresponsive element 5 reaches a specific temperature.
  • the second area 52 is formed integrally with the first area 51.
  • the second area 52 is formed continuously from the first area 51 in the hatched area in the drawing. Since the second region 52 is integrally and continuously formed from the first region 51, the first region 51 is integrally deformed with the second region 52. Therefore, during the snap deformation, the first region 51 and the second region 52 interfere with each other and the action of inhibiting the deformation of the first region 51 by the second region 52 is enhanced.
  • thermoresponsive element 5 maintains the normal rotation shape shown in FIGS. 2 and 4 in a normal temperature range, and when it reaches the reversal operation temperature due to overheating, snap-deforms to the reversal shape shown in FIG. Along with this, the state of the movable piece 4 shifts from the conductive state to the cutoff state. After that, when the temperature of the heat responsive element 5 decreases to the normal rotation return temperature due to heat radiation or the like, the heat responsive element 5 snap-deforms into the normal rotation shape shown in FIGS. 2 and 4. Along with this, the state of the movable piece 4 returns from the cutoff state to the conductive state.
  • the second region 52 acts so as to prevent the deformation of the first region 51 from the normal shape to the inverted shape and maintain the normal shape. As a result, the stress required to deform the thermoresponsive element 5 into the inverted shape is raised, and the reversal operation temperature of the thermoresponsive element 5 is easily increased.
  • the second region 52 acts to prevent the first region 51 from deforming from the inverted shape to the normal shape and maintain the inverted shape.
  • the above-mentioned stress required for the thermoresponsive element 5 to be deformed into the normal rotation shape is increased, and the normal rotation return temperature at which the thermoresponsive element 5 is snap-deformed into the normal rotation shape is lowered. Therefore, the normal rotation return temperature of the heat responsive element 5 can be easily lowered, and the difference between the reversal operation temperature and the normal rotation return temperature can be easily increased without making the radius of curvature of the heat responsive element 5 excessively small. It will be possible.
  • the normal heat responsive element is restored to normal rotation. It is possible to significantly reduce the temperature. This makes it possible to easily lower the temperature at which the movable piece 4 returns from the cutoff state to the conductive state and delay the return of the movable piece 4 to the conductive state.
  • the second region 52 is formed inside the circumscribing circle 53 of the first region 51. This makes it possible to increase the difference between the reversal operation temperature and the normal rotation recovery temperature without increasing the size of the heat responsive element 5.
  • the thermoresponsive element 5 is formed in a rectangular shape in a plan view when viewed from the thickness direction.
  • the first region 51 is formed on the two diagonal lines 59 of the thermoresponsive element 5.
  • the thermal responsive element 5 as described above generates a large stress as the temperature changes. Therefore, the movable piece 4 having a large elastic force can be adopted, and the contact resistance between the fixed contact 21 and the movable contact 41 in the conductive state can be easily reduced.
  • the heat responsive element 5 is formed in a rectangular shape having a long side 54 extending in the length direction and a short side 55 extending in the width direction perpendicular to the length direction in a plan view.
  • the length of the diagonal line 59 is large, and a large stress is generated with a temperature change.
  • the second region 52 is preferably formed along the long side 54. Furthermore, the second region 52 is preferably formed along the short side 55.
  • the first region 51 is formed in an “X” shape in a plan view, and the second region 52 is formed around the first region 51. Such a second region 52 increases the effect of inhibiting the deformation of the first region 51, and increases the difference between the reversal operation temperature and the normal rotation return temperature.
  • FIG. 5 shows a cross section (cross section parallel to the long side 54) of the thermoresponsive element 5 in FIG.
  • the radius of curvature R2 of the second region 52 is preferably larger than the radius of curvature R1 of the first region 51. According to such a configuration, it becomes possible to easily manufacture the thermoresponsive element 5 having the first region 51 and the second region 52. Further, the second region 52 as described above has a large effect of inhibiting the deformation of the first region 51.
  • the radius of curvature R2 of the second region 52 may be infinite, that is, the second region 52 may be configured by a plane.
  • FIG. 5 shows the relationship between the first region 51 and the second region 52 formed along the short side 55, but the second region formed along the first region 51 and the long side 54. The relationship with the region 52 is similar.
  • FIG. 6 shows a cross section taken along line AA of a thermoresponsive element 5A which is a modified example of the thermoresponsive element 5.
  • the thermal response element 5A differs from the thermal response element 5 in that the center O2 of curvature of the second region 52 is located on the opposite side of the center O1 of curvature of the first region 51 across the thermal response element 5. ing.
  • the center of curvature O1 and the center of curvature O2 are transferred from the B surface side to the A surface side or from the A surface side to the B surface side of the thermoresponsive element 5 before and after the snap deformation.
  • the thermoresponsive element 5A only the center of curvature O1 is transferred from the B surface side to the A surface side or from the A surface side to the B surface side of the thermoresponsive element 5A before and after the snap deformation. Therefore, since the deformation mode of the first region 51 and the deformation mode of the second region 52 are different, the effect of impeding the deformation of the first region 51 by the second region 52 is greatly obtained, and the reversal operation temperature and the normal rotation return temperature are obtained. It is possible to set the difference between and larger.
  • the radius of curvature R2 of the second region 52 is preferably smaller than the radius of curvature R1 of the first region 51. Such a second region 52 has a large effect of inhibiting the deformation of the first region 51.
  • the other configurations of the thermoresponsive element 5A are similar to those of the thermoresponsive element 5.
  • thermoresponsive elements 5B to 5E which are other modified examples of the heat responsive element 5.
  • the arrangement of the first region 51 and the second region 52 is different from that of the thermoresponsive element 5 and the like.
  • the second region 52 is formed only along the long side 54. As shown in FIG. 8, in the thermoresponsive element 5C, the second region 52 is formed only along the short side 55.
  • the first region 51 is formed in a “Y” shape, and the second region 52 is formed around the first region 51.
  • the first region 51 is formed in a "+” shape, and the second region 52 is formed in the periphery thereof, that is, in the diagonal region of the thermoresponsive element 5E.
  • the radius of curvature R1 of the first region 51, the center of curvature O1 and the radius of curvature R2 of the second region 52, and the center of curvature O2 can be set as shown in FIG. 5 or FIG.
  • the first region 51 that snap-deforms with a change in temperature and the second region 52 that is integrally formed from the first region 51 and has a large effect of inhibiting the deformation of the first region 51 are easily formed. ..
  • the first region 51 and the second region 52 are preferably arranged symmetrically with respect to the longitudinal centerline of the movable piece 4. With such a heat responsive element 5 and the like, the symmetry of the inverted shape after the snap deformation can be easily maintained.
  • the breaker 1 of the present invention is not limited to the configuration of the above embodiment, and may be implemented in various modes. That is, the present invention is at least the heat-responsive element 5 formed in the shape of a curved plate, which is integrally formed from the first region 51 and the first region 51 which are deformed with a snap action according to a temperature change.
  • the second region 52 may be formed inside the circumscribed circle 53 of the first region 51, including the second region 52 that inhibits the deformation of the first region 51.
  • the method of joining the case body 7 and the lid member 8 is not limited to ultrasonic welding, and any method can be appropriately applied as long as the method can firmly join the two.
  • a liquid or gel adhesive may be applied/filled and cured to bond the two.
  • the case 10 is not limited to the form formed by the case body 7, the lid member 8 and the like, and may be formed by two or more parts.
  • the present invention can also be applied to a mode in which a movable piece and a terminal piece are separately molded and electrically connected by welding or the like, for example, as disclosed in JP-A-2016-35822. ..
  • the present invention can also be applied to a form in which the terminals 22 and 42 are exposed from the B surface of the case body 7.
  • the present invention can be applied to a form in which the lid member 8 is omitted from the case 10, that is, a form in which the recess 73 of the case body 7 is opened and the movable piece 4 and the like are exposed.
  • the distance between the fixed contact 21 and the movable contact 41 when the movable piece 4 is in the cutoff state can be easily increased.
  • the terminal piece is insert-molded in the case body 7, and the movable piece 4 is welded to the terminal piece at the base end side thereof, as disclosed in JP-A-2016-35822. May be fixed by.
  • the PTC thermistor 6 has a self-holding circuit, but it is also applicable to a form in which such a configuration is omitted.
  • the movable piece 4 can be omitted while omitting the PTC thermistor 6. It is possible to substantially prevent the return from the cutoff state to the conduction state.
  • FIG. 11 shows a secondary battery pack 500.
  • the secondary battery pack 500 includes a secondary battery 501 and a breaker 1 provided in the output circuit of the secondary battery 501.
  • FIG. 12 shows a safety circuit 502 for electrical equipment.
  • the safety circuit 502 includes the 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 including the breaker 1, it is possible to manufacture the secondary battery pack 500 or the safety circuit 502 in which the difference between the operating temperature and the return temperature of the breaker 1 is large.
  • Breaker 2 Fixed piece 4: Movable piece 5: Thermoresponsive element 21: Fixed contact 41: Moving contact 44: Elastic part 51: First area 52: Second area 53: Circumscribed circle 54: Long side 55: Short side 500: secondary battery pack 501: secondary battery 502: safety circuit O1: center of curvature O2: center of curvature R1: radius of curvature R2: radius of curvature

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  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Thermally Actuated Switches (AREA)
PCT/JP2019/047242 2018-12-14 2019-12-03 熱応動素子、ブレーカー、安全回路及び２次電池パック WO2020121896A1 (ja)

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Application Number Priority Date Filing Date Title
CN201980077924.2A CN113168991B (zh) 2018-12-14 2019-12-03 热响应元件、断路器、安全电路及二次电池组

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Application Number Priority Date Filing Date Title
JP2018233952A JP7083742B2 (ja) 2018-12-14 2018-12-14 熱応動素子、ブレーカー、安全回路及び２次電池パック
JP2018-233952 2018-12-14

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WO2020121896A1 true WO2020121896A1 (ja) 2020-06-18

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JPH02134636U (enrdf_load_stackoverflow) * 1989-04-13 1990-11-08
US20020044624A1 (en) * 2000-10-13 2002-04-18 Davis George D. Laser adjusted set-point of bimetallic thermal disc
JP2017010621A (ja) * 2015-06-16 2017-01-12 ボーンズ株式会社 熱応動素子並びにそれを備えたブレーカー、安全回路、及び、二次電池パック

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