JP2012238615A - Breaker and secondary battery provided with the same - Google Patents

Breaker and secondary battery provided with the same Download PDF

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JP2012238615A
JP2012238615A JP2012178354A JP2012178354A JP2012238615A JP 2012238615 A JP2012238615 A JP 2012238615A JP 2012178354 A JP2012178354 A JP 2012178354A JP 2012178354 A JP2012178354 A JP 2012178354A JP 2012238615 A JP2012238615 A JP 2012238615A
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movable piece
fixed
elastic portion
elastic
contact
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JP5154708B2 (en
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Yoshihiro Nakanishi
義博 中西
Kota Yagi
孝太 八木
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Komatsulite Manufacturing Co Ltd
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/02Housings; Casings; Bases; Mountings
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00Thermally-actuated switches
    • H01H37/02Details
    • H01H37/04Bases; Housings; Mountings
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00Contacts
    • H01H1/50Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position
    • H01H1/504Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position by thermal means
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00Thermally-actuated switches
    • H01H37/02Details
    • H01H37/12Means for adjustment of "on" or "off" operating temperature
    • H01H37/14Means for adjustment of "on" or "off" operating temperature by anticipatory electric heater
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00Thermally-actuated switches
    • H01H37/02Details
    • H01H37/32Thermally-sensitive members
    • H01H37/52Thermally-sensitive members actuated due to deflection of bimetallic element
    • H01H37/54Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting
    • H01H37/5427Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting encapsulated in sealed miniaturised housing
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10Operating or release mechanisms
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10Operating or release mechanisms
    • H01H71/12Automatic release mechanisms with or without manual release
    • H01H71/14Electrothermal mechanisms
    • H01H71/16Electrothermal mechanisms with bimetal element
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00Contacts
    • H01H1/58Electric connections to or between contacts; Terminals

Abstract

PROBLEM TO BE SOLVED: To provide a small breaker which can be further miniaturized while reducing contact resistance, by properly maintaining a contact position between a fixed contact and a movable contact.SOLUTION: The breaker comprises: a fixed piece 2; a movable piece 3; a bimetal 4; and a case 6. The movable piece 3 has a second elastic part 35 having a lower elastic modulus than a first elastic part 34 and is fixed at a fixed part 33 between the first elastic part 34 and the second elastic part 35 by the case 6.

Description

本発明は、二次電池に内蔵される小型のブレーカーに関するものである。   The present invention relates to a small breaker built in a secondary battery.

従来から、携帯電話機やノート型パソコンなどに搭載される小型のニッケル水素電池、リチウムイオン電池などの二次電池用の安全装置には、PTCサーミスター(一定温度以上で抵抗値が急激に増大する導電物質)及び温度ヒューズなどが用いられている。これらを用いた保護回路には、それぞれ、動作温度の帯域幅が広く精密な温度設定が困難であるか、複数回使用できないためにその製造工程において全数検査が不可能であるという欠点があった。そこで、このような従来の保護回路に代えて、精密な動作温度の設定が可能であり、かつ複数回の使用に耐える、機械動作式の安全装置が要望され、種々の技術が提案されている。   Conventionally, a safety device for a secondary battery such as a small nickel-metal hydride battery or a lithium-ion battery mounted on a mobile phone or a notebook personal computer has a PTC thermistor (the resistance value increases rapidly above a certain temperature). Conductive materials) and thermal fuses are used. Each of these protection circuits has a drawback that it is difficult to set a precise temperature with a wide operating temperature bandwidth, or that it cannot be used more than once, so that it is impossible to perform 100% inspection in the manufacturing process. . Therefore, in place of such a conventional protection circuit, there is a demand for a mechanically operated safety device that can set a precise operating temperature and withstand multiple use, and various techniques have been proposed. .

例えば、特許文献1には、固定接点を有する固定片と、先端部に可動接点を有する可動片と、所定の作動温度で可動接点が固定接点から離反するように可動片を作動させる熱応動素子と、固定片と接続されたPTC素子と、これらを収容する絶縁性の扁平なケースを備えた小型ブレーカーが開示されている。また、特許文献2には、小型ブレーカーの製造方法が開示されている。   For example, Patent Document 1 discloses a fixed piece having a fixed contact, a movable piece having a movable contact at the tip, and a thermally responsive element that operates the movable piece so that the movable contact is separated from the fixed contact at a predetermined operating temperature. And a small breaker including a PTC element connected to a fixed piece and an insulating flat case for housing them. Patent Document 2 discloses a method for manufacturing a small breaker.

特開2005−129471号公報JP 2005-129471 A 特開2002−83523号公報JP 2002-83523 A

携帯電話機、ノート型パソコンなどに用いられる二次電池は、近年、益々小型化が進んでおり、二次電池に内蔵される小型ブレーカーにも一層の小型化が要求されている。しかしながら、小型ブレーカーのような機械動作式製品の部材寸法が一定値を下回ると、単純に構成部材を縮小し既存の生産設備及び製法に適用するのみでは、充分な完成度と生産性の両立が困難になる。とりわけ、小型ブレーカーの固定片に設けられた固定接点と可動片に設けられた可動接点とを位置決めする工程においては、部材寸法の縮小に伴って、組み立て時の誤差に対する脆弱度が増し、固定接点と可動接点との接触位置が適正でない場所に位置ずれしやすくなる。   In recent years, secondary batteries used in mobile phones, notebook computers, and the like have been increasingly miniaturized, and further miniaturization is required for small breakers incorporated in secondary batteries. However, if the component size of a mechanically operated product such as a small breaker falls below a certain value, it is possible to achieve both sufficient completeness and productivity by simply reducing the components and applying them to existing production equipment and manufacturing methods. It becomes difficult. In particular, in the process of positioning the fixed contact provided on the fixed piece of the small breaker and the movable contact provided on the movable piece, the degree of vulnerability to errors during assembly increases as the member size decreases, and the fixed contact And the movable contact are liable to be displaced to a place where the contact position is not appropriate.

このような接点の位置ずれは、電気製品の安全装置にとって重大な、接触抵抗が不安定となるという問題の原因となり、小型ブレーカーの不良率を低減するにあたって障害となっていた。殊に、可動片の寸法がサブミリメートル精度に達すると、熱応動素子や可動片の載置、蓋部材の装着を含むあらゆる部材の組み付け工程において、上述した接点の位置ずれに起因する問題が顕著となる。さらに、完成した良品の小型ブレーカーを安全装置に組み付ける際に取り扱いを乱暴にすると、端子が捻転したときに接点の接触位置に悪影響を及ぼす虞がある。   Such misalignment of the contact causes a problem that the contact resistance becomes unstable, which is serious for the safety device of the electric product, and has been an obstacle in reducing the defect rate of the small breaker. In particular, when the size of the movable piece reaches sub-millimeter accuracy, the problems caused by the above-described positional deviation of the contact are prominent in the assembly process of all members including mounting of the thermally responsive element and the movable piece and mounting of the lid member. It becomes. Furthermore, if the handling is rough when assembling the finished small good breaker to the safety device, the contact position of the contact may be adversely affected when the terminal is twisted.

本発明は、上記課題を解決するためになされたものであり、固定接点と可動接点との接触位置を適正に維持することにより、接触抵抗を低減しつつ、さらなる小型化を図ることができるブレーカーを提供することを目的とする。   The present invention has been made in order to solve the above-described problems, and by properly maintaining the contact position between the fixed contact and the movable contact, it is possible to further reduce the size while reducing the contact resistance. The purpose is to provide.

上記目的を達成するため、本発明のブレーカーは、固定接点を有する固定片と、可動接点を有し、この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接点が前記固定接点から離反するように前記可動片を作動させる熱応動素子と、前記固定片、可動片及び熱応動素子を収容するケースとを備えたブレーカーにおいて、前記可動片は、前記ケースの外側に突出される端子と、前記可動接点を前記固定接点に押圧するための弾性力を発生する第1弾性部と、前記第1弾性部と前記端子との間に形成された第2弾性部とを有し、前記第2弾性部における前記可動片の延出方向に垂直な平面で切った断面積が、前記第1弾性部における前記可動片の延出方向に垂直な平面で切った断面積よりも小さいことを特徴とする。   In order to achieve the above object, a breaker according to the present invention includes a fixed piece having a fixed contact, a movable contact, a movable piece that presses and contacts the movable contact with the fixed contact, and deforms as the temperature changes. A breaker comprising: a thermally responsive element that operates the movable piece so that the movable contact is separated from the fixed contact; and a case that houses the fixed piece, the movable piece, and the thermally responsive element. Is formed between a terminal protruding outside the case, a first elastic part that generates an elastic force for pressing the movable contact against the fixed contact, and the first elastic part and the terminal. A cross-sectional area cut by a plane perpendicular to the extending direction of the movable piece in the second elastic portion is perpendicular to the extending direction of the movable piece in the first elastic portion. Than the cross-sectional area cut by a plane Characterized in that again.

このブレーカーにおいては、前記可動片は、前記第1弾性部と前記第2弾性部との間で前記可動片の幅方向に翼状に延出され、前記ケースによって固定される固定部と、前記固定部と前記端子の間に形成された貫通孔を有することが好ましい。   In this breaker, the movable piece extends in a wing shape in the width direction of the movable piece between the first elastic portion and the second elastic portion, and is fixed by the case, and the fixed portion It is preferable to have a through hole formed between the portion and the terminal.

このブレーカーにおいては、前記可動片は、前記固定部における前記可動片の延出方向に垂直な幅寸法が、前記第2弾性部における前記可動片の延出方向に垂直な幅寸法よりも大きいことが好ましい。   In this breaker, the movable piece has a width dimension perpendicular to the extending direction of the movable piece in the fixed portion larger than a width dimension perpendicular to the extending direction of the movable piece in the second elastic portion. Is preferred.

このブレーカーにおいては、前記固定部は、前記可動片の幅方向に翼状に延出された部分の両端領域及びその中間領域において前記ケースによって固定されていることが好ましい。   In this breaker, it is preferable that the fixed portion is fixed by the case in both end regions and intermediate regions of a portion extending in a wing shape in the width direction of the movable piece.

このブレーカーにおいては、前記固定部は、前記可動片の幅方向において前記第2弾性部より外側に位置する両端領域と、前記第2弾性部と重複する中央領域において、前記ケースによって固定されていることが好ましい。   In this breaker, the fixed portion is fixed by the case in both end regions located outside the second elastic portion in the width direction of the movable piece and in a central region overlapping the second elastic portion. It is preferable.

このブレーカーにおいては、前記ケースは、前記可動片の貫通孔に係合される突起を有することが好ましい。   In this breaker, it is preferable that the case has a protrusion engaged with the through hole of the movable piece.

本発明の二次電池は、上記いずれかのブレーカーを備えたことを特徴とする。   A secondary battery according to the present invention includes any one of the above breakers.

本発明によれば、第2弾性部における可動片の延出方向に垂直な平面で切った断面積が、第1弾性部における同断面積よりも小さいので、外力が可動片の端子に加えられたとき、第1弾性部における変形よりも第2弾性部における変形が大きくなる。従って、ブレーカーの製造、搬送又は二次電池への組み込み工程において可動片の端子に外力や衝撃が加えられても、第2弾性部によって吸収されることとなり、可動接点の位置が適正に維持される。その結果、固定接点と可動接点との接触位置が適正に維持されて、接触抵抗を安定して抑制することが可能となり、ブレーカーのさらなる小型化を図ることができる。   According to the present invention, since the cross-sectional area cut by the plane perpendicular to the extending direction of the movable piece in the second elastic portion is smaller than the same cross-sectional area in the first elastic portion, an external force is applied to the terminal of the movable piece. When, the deformation in the second elastic part becomes larger than the deformation in the first elastic part. Therefore, even if an external force or impact is applied to the terminal of the movable piece in the process of manufacturing, transporting, or incorporating the breaker into the secondary battery, it is absorbed by the second elastic portion, and the position of the movable contact is properly maintained. The As a result, the contact position between the fixed contact and the movable contact is properly maintained, the contact resistance can be stably suppressed, and the breaker can be further reduced in size.

また、可動片が、その幅方向に翼状に延出される固定部と、固定部と端子の間の第2弾性部に形成された貫通孔を有する構成によれば、固定部における可動片の延出方向に垂直な平面で切った断面積を容易に大きくすることができ、第2弾性部における同断面積を容易に小さくすることができる。そして、第1弾性部と第2弾性部との間に設けられた固定部がケースによって固定されるので、外力が可動片の端子に加えられたとき、第2弾性部に生ずる応力は第1弾性部にはほとんど伝達されず、第1弾性部から可動接点にかけて変形は生じない。   Further, according to the configuration in which the movable piece has a fixed portion extending in a wing shape in the width direction and a through hole formed in the second elastic portion between the fixed portion and the terminal, the extension of the movable piece in the fixed portion is achieved. The cross-sectional area cut by the plane perpendicular to the outgoing direction can be easily increased, and the same cross-sectional area in the second elastic portion can be easily reduced. And since the fixed part provided between the 1st elastic part and the 2nd elastic part is fixed by a case, when external force is applied to the terminal of a movable piece, the stress which arises in the 2nd elastic part is the 1st Almost no transmission to the elastic part, and no deformation occurs from the first elastic part to the movable contact.

また、固定部における可動片の延出方向に垂直な幅寸法が、第2弾性部における同幅寸法よりも大きい構成によれば、外力が可動片の端子に加えられたとき、第1弾性部から可動接点にかけての変形をより一層抑制することができる。   Further, according to the configuration in which the width dimension perpendicular to the extending direction of the movable piece in the fixed portion is larger than the same width dimension in the second elastic portion, when an external force is applied to the terminal of the movable piece, the first elastic portion To the movable contact can be further suppressed.

また、固定部が、可動片の幅方向に翼状に延出された部分の両端領域及びその中間領域において固定されている構成によれば、固定部が強固に固定されるので、外力が可動片の端子に加えられたとき、第1弾性部から可動接点にかけての変形をより一層抑制することができる。   In addition, according to the configuration in which the fixed portion is fixed in the both end regions of the portion extending in the wing shape in the width direction of the movable piece and the intermediate region thereof, the fixed portion is firmly fixed, so that the external force is movable piece When applied to the terminal, deformation from the first elastic portion to the movable contact can be further suppressed.

また、固定部が、可動片の幅方向において第2弾性部より外側に位置する両端領域と、第2弾性部と重複する中央領域において固定されている構成によれば、上記と同様に、固定部が強固に固定されるので、外力が可動片の端子に加えられたとき、第1弾性部から可動接点にかけての変形をより一層抑制することができる。   Further, according to the configuration in which the fixed portion is fixed in the both end regions located outside the second elastic portion in the width direction of the movable piece and the central region overlapping the second elastic portion, the fixed portion is fixed in the same manner as described above. Since the portion is firmly fixed, deformation from the first elastic portion to the movable contact can be further suppressed when an external force is applied to the terminal of the movable piece.

また、ケースが、可動片の貫通孔に係合される突起を有する構成によれば、可動片をケースに組み込む際に、貫通孔を突起に係合させることにより、可動片をケース本体に容易かつ正確に案内し組み込むことができる。   Further, according to the configuration in which the case has a protrusion that is engaged with the through hole of the movable piece, the movable piece can be easily attached to the case body by engaging the through hole with the protrusion when the movable piece is incorporated into the case. And it can be guided and incorporated accurately.

また、ブレーカーの接触抵抗を低減しつつ、小型化を図った二次電池を得ることができる。   Further, it is possible to obtain a secondary battery that is reduced in size while reducing the contact resistance of the breaker.

本発明の一実施形態によるブレーカーの構成を示す組み立て斜視図。The assembly perspective view which shows the structure of the breaker by one Embodiment of this invention. ブレーカー本体に蓋部材を組み込む状態を示す斜視図。The perspective view which shows the state which incorporates a cover member in a breaker main body. 通常の充電又は放電状態におけるブレーカーの動作を示す断面図。Sectional drawing which shows operation | movement of the breaker in a normal charge or discharge state. 過充電状態又は異常時などにおけるブレーカーの動作を示す断面図。Sectional drawing which shows operation | movement of a breaker in the time of an overcharge state or abnormality. 可動片及びケース本体の構成を拡大して示す斜視図。The perspective view which expands and shows the structure of a movable piece and a case main body. 可動片及びケース本体の変形例の構成を拡大して示す斜視図。The perspective view which expands and shows the structure of the modification of a movable piece and a case main body. 組み立て前におけるケース本体の突起の形状を示す断面図。Sectional drawing which shows the shape of protrusion of a case main body before an assembly. 組み立て前におけるケース本体の突起及び凸部の変形例を示す断面図。Sectional drawing which shows the modification of the protrusion and convex part of a case main body before an assembly.

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及び図2は、ブレーカーの構成を示している。ブレーカー1は、固定接点21を有する固定片2と、先端部に可動接点31を有する可動片3と、温度変化に伴って変形する熱応動素子4と、PTC(Positive Temperature Coefficient)サーミスター5と、固定片2、可動片3、熱応動素子4及びPTCサーミスター5を収容するケース6等によって構成されている。ケース6は、ケース本体61とケース本体61の上面に装着される蓋部材62等によって構成されている。   A breaker according to an embodiment of the present invention will be described with reference to the drawings. 1 and 2 show the configuration of the breaker. The breaker 1 includes a fixed piece 2 having a fixed contact 21, a movable piece 3 having a movable contact 31 at the tip, a thermally responsive element 4 that deforms with a change in temperature, a PTC (Positive Temperature Coefficient) thermistor 5, , A fixed piece 2, a movable piece 3, a thermally responsive element 4 and a case 6 for housing a PTC thermistor 5. The case 6 includes a case main body 61 and a lid member 62 attached to the upper surface of the case main body 61.

固定片2は、リン青銅を主成分とする金属板(この他、銅−チタン合金、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、ケース本体61にインサート成形又はカシメなどにより組み込まれている。固定片2の一端には端子22が形成され、中央部にはPTCサーミスター5が載置されている。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、メッキ又は塗布等により形成され、ケース本体61の上方に形成されている開口63の一部から露出されている。端子22はケース本体61の一端から外側に突出されている。   The fixing piece 2 is formed by pressing a metal plate mainly composed of phosphor bronze (in addition, a metal plate such as copper-titanium alloy, white or brass), and insert molding or caulking on the case body 61. It is incorporated by. A terminal 22 is formed at one end of the fixed piece 2, and a PTC thermistor 5 is placed at the center. The fixed contact 21 is formed by cladding, plating, coating, or the like of a conductive material such as copper, silver alloy, gold-silver alloy in addition to silver, nickel, nickel-silver alloy, and is formed above the case body 61. It is exposed from a part of the opening 63 formed. The terminal 22 protrudes outward from one end of the case body 61.

可動片3は、固定片2と同等の金属板をプレス加工することにより形成されている。可動片3の一端には端子32が形成されてケース本体61から外側に突出され、他端には可動接点31が形成されている。可動接点31は、固定接点21と同様の材料及び手法によって可動片3の先端部に形成されている。可動片3は、可動接点31と端子32の間に、固定部33、第1弾性部34及び第2弾性部35を有している。固定部33においてケース本体61と蓋部材62によって挟み込まれて可動片3が固定され、第1弾性部34が弾性変形することにより、その先端に形成されている可動接点31が固定接点21に押圧されて接触し、固定片2と可動片3とが通電可能となる。また、第2弾性部35は、固定部33と端子32との間に形成されている。固定部33と端子32との間に円形の貫通孔36及び切り欠き37を設けることにより、第2弾性部35の弾性係数は第1弾性部34よりも低く設定されている。ここで、弾性係数とは、応力に応じたひずみの変化率をいい、応力の方向は特に限定されない。第2弾性部35の弾性係数が第1弾性部34より低いということは、可動片3が破壊されない程度の外力が端子32に加えられたとき、第1弾性部34における変形よりも第2弾性部35における変形が大きいことになる。さらに本実施形態においては、第2弾性部35と第1弾性部34との間の固定部33において、可動片3が強固に固定されているため、第2弾性部35に生ずる応力は第1弾性部34にはほとんど伝達されず、第1弾性部34から可動接点31にかけて変形は生じない。   The movable piece 3 is formed by pressing a metal plate equivalent to the fixed piece 2. A terminal 32 is formed at one end of the movable piece 3 and protrudes outward from the case body 61, and a movable contact 31 is formed at the other end. The movable contact 31 is formed at the tip of the movable piece 3 by the same material and method as the fixed contact 21. The movable piece 3 includes a fixed portion 33, a first elastic portion 34, and a second elastic portion 35 between the movable contact 31 and the terminal 32. The movable piece 3 is fixed by being sandwiched between the case main body 61 and the lid member 62 in the fixed portion 33, and the first elastic portion 34 is elastically deformed, so that the movable contact 31 formed at the tip thereof is pressed against the fixed contact 21. Thus, the fixed piece 2 and the movable piece 3 can be energized. The second elastic part 35 is formed between the fixed part 33 and the terminal 32. By providing the circular through hole 36 and the notch 37 between the fixed portion 33 and the terminal 32, the elastic coefficient of the second elastic portion 35 is set lower than that of the first elastic portion 34. Here, the elastic modulus means a rate of change of strain corresponding to the stress, and the direction of the stress is not particularly limited. The fact that the elastic coefficient of the second elastic portion 35 is lower than that of the first elastic portion 34 means that when an external force is applied to the terminal 32 to such an extent that the movable piece 3 is not destroyed, the second elastic portion 35 is more elastic than the deformation in the first elastic portion 34. The deformation in the portion 35 is large. Furthermore, in this embodiment, since the movable piece 3 is firmly fixed in the fixing portion 33 between the second elastic portion 35 and the first elastic portion 34, the stress generated in the second elastic portion 35 is the first. Almost no transmission is made to the elastic portion 34, and no deformation occurs from the first elastic portion 34 to the movable contact 31.

固定部33の幅寸法(可動片3の延出方向に垂直な方向の寸法)は、第1弾性部34及び第2弾性部35よりも大きく設定されている。また、第1弾性部34の下面には、熱応動素子4に対向して小突起38が形成されている。小突起38と熱応動素子4とは常に接触しており、熱応動素子4の変形が第1弾性部34に伝達される(図3及び図4参照)。可動片3の材料としては、リン青銅を主成分とするものが好ましい。この他、銅−チタン合金、洋白、黄銅などの導電性弾性材料も用いられる。なお、可動片3は、第1弾性部34において、プレス加工により湾曲又は屈曲されている。湾曲又は屈曲の度合いは、熱応動素子4を収容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。   The width dimension of the fixed part 33 (dimension in the direction perpendicular to the extending direction of the movable piece 3) is set larger than that of the first elastic part 34 and the second elastic part 35. In addition, a small protrusion 38 is formed on the lower surface of the first elastic portion 34 so as to face the thermally responsive element 4. The small protrusion 38 and the thermally responsive element 4 are always in contact with each other, and the deformation of the thermally responsive element 4 is transmitted to the first elastic portion 34 (see FIGS. 3 and 4). The material of the movable piece 3 is preferably a material mainly composed of phosphor bronze. In addition, a conductive elastic material such as copper-titanium alloy, white or brass is also used. In addition, the movable piece 3 is curved or bent by press working in the first elastic portion 34. The degree of bending or bending is not particularly limited as long as the thermally responsive element 4 can be accommodated, and may be appropriately set in consideration of the elastic force at the operating temperature and the return temperature, the pressing force of the contact, and the like.

熱応動素子4は円弧状に湾曲した形状をなし、バイメタル、トリメタルなどの複合材料からなる。過熱により動作温度に達すると湾曲形状は反転し、冷却により復帰温度を下回ると復元する。熱応動素子4は、バイメタルが用いられるのが通常なので、以降、特に限定のない限りバイメタル4と呼ぶ。バイメタル4の形状は、プレス加工により形成することができる。所期の温度でバイメタル4の反転動作により可動片3の第1弾性部34が押し上げられ、かつ第1弾性部34の弾性力により元に戻る限り、バイメタル4の材質及び形状は特に限定されるものでないが、生産性及び反転動作の効率性の観点から矩形が望ましく、小型でありながら第1弾性部34を効率的に押し上げるために正方形に近い長方形であるのが望ましい。なお、バイメタル4の材料としては、例えば、高膨脹側に銅−ニッケル−マンガン合金又はニッケル−クロム−鉄合金、低膨脹側に鉄−ニッケル合金をはじめとする、洋白、黄銅、ステンレスなど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。   The thermally responsive element 4 has an arcuate shape and is made of a composite material such as bimetal or trimetal. When the operating temperature is reached due to overheating, the curved shape is reversed, and when it falls below the return temperature due to cooling, it is restored. Since the thermoresponsive element 4 is usually a bimetal, it is hereinafter referred to as a bimetal 4 unless otherwise specified. The shape of the bimetal 4 can be formed by press working. The material and shape of the bimetal 4 are particularly limited as long as the first elastic part 34 of the movable piece 3 is pushed up by the reversing operation of the bimetal 4 at a predetermined temperature and returns to the original state by the elastic force of the first elastic part 34. However, the rectangular shape is desirable from the viewpoint of productivity and the efficiency of the reversal operation, and it is desirable that the rectangular shape is close to a square in order to efficiently push up the first elastic portion 34 while being small. Examples of the material of the bimetal 4 include various materials such as white, brass, and stainless steel, including a copper-nickel-manganese alloy or nickel-chromium-iron alloy on the high expansion side and an iron-nickel alloy on the low expansion side. A material obtained by laminating two types of materials having different thermal expansion coefficients made of the above alloys is used in combination according to the required conditions.

バイメタル4の反転動作により固定片2と可動片3との通電が遮断されたとき、PTCサーミスター5に流れる電流が増大する。PTCサーミスター5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、動作電流、動作電圧、動作温度、復帰温度などの必要に応じて種類を選択でき、その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。   When the energization of the fixed piece 2 and the movable piece 3 is interrupted by the reversing operation of the bimetal 4, the current flowing through the PTC thermistor 5 increases. If the PTC thermistor 5 is a positive temperature coefficient thermistor that limits the current by increasing the resistance value as the temperature rises, the type of operating current, operating voltage, operating temperature, return temperature, etc. can be selected as required. The shape is not particularly limited as long as these properties are not impaired.

ケース6を構成するケース本体61及び蓋部材62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)などの樹脂により成形されている。ケース本体61には、固定片2、可動片3、バイメタル4及びPTCサーミスター5などを収容するための開口63と、可動片3と係合される円筒状の突起64及び斜面状の凸部65などが形成されている。円筒状の突起64は円形の貫通孔36と係合され、斜面状の凸部65は切り欠き37と係合される。なお、ケース本体61に組み込まれた可動片3、バイメタル4及びPTCサーミスター5は、開口63の内部に形成されている枠67、68及び69によってそれぞれ当接され、バイメタル4の反転時に案内される。   The case body 61 and the lid member 62 constituting the case 6 are formed of a resin such as flame retardant polyamide, polyphenylene sulfide (PPS), liquid crystal polymer (LCP), or polybutylene terephthalate (PBT) having excellent heat resistance. Yes. The case body 61 has an opening 63 for accommodating the fixed piece 2, the movable piece 3, the bimetal 4, the PTC thermistor 5, etc., a cylindrical protrusion 64 and a sloped convex portion that are engaged with the movable piece 3. 65 etc. are formed. The cylindrical protrusion 64 is engaged with the circular through hole 36, and the sloped convex portion 65 is engaged with the notch 37. The movable piece 3, the bimetal 4 and the PTC thermistor 5 incorporated in the case body 61 are brought into contact with each other by frames 67, 68 and 69 formed inside the opening 63, and are guided when the bimetal 4 is reversed. The

図2に示すように、固定片2、可動片3、バイメタル4及びPTCサーミスター5などを収容したケース本体61の開口63を塞ぐように、蓋部材62が、ケース本体61の上面に装着される。ケース本体61と蓋部材62とは、超音波溶着によって接合される。このとき、円筒状の突起64及び斜面状の凸部65の頂部は、蓋部材62と接合される。蓋部材62は、金属部を有してもよい。金属部を有する方が機械的強度の観点から小型化には有利であり、さらに、金属部にカバー端子を設けることにより、安全装置の他の部分に予備電源を供給することもできる。   As shown in FIG. 2, a lid member 62 is mounted on the upper surface of the case body 61 so as to close the opening 63 of the case body 61 that houses the fixed piece 2, the movable piece 3, the bimetal 4, the PTC thermistor 5, and the like. The The case main body 61 and the lid member 62 are joined by ultrasonic welding. At this time, the tops of the cylindrical protrusions 64 and the sloped convex portions 65 are joined to the lid member 62. The lid member 62 may have a metal part. Having a metal part is advantageous for miniaturization from the viewpoint of mechanical strength. Further, by providing a cover terminal on the metal part, it is possible to supply a spare power source to other parts of the safety device.

図3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、バイメタル4は正転しており(反転前であり)、固定接点21と可動接点31は接触し、可動片3の第1弾性部34などを通じてブレーカー1の両端子22、32間は導通している。可動片3の第1弾性部34とバイメタル4とは接触しており、可動片3、バイメタル4、PTCサーミスター5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5の抵抗は、可動片3の抵抗に比べて圧倒的に大きいため、PTCサーミスター5を流れる電流は、固定接点21及び可動接点31を流れる量に比して完全に無視できる程度である。   FIG. 3 shows the operation of the breaker 1 in a normal charge or discharge state. In a normal charge or discharge state, the bimetal 4 is rotating forward (before inversion), the fixed contact 21 and the movable contact 31 are in contact, and both ends of the breaker 1 are passed through the first elastic portion 34 of the movable piece 3 and the like. The children 22 and 32 are electrically connected. The first elastic part 34 of the movable piece 3 and the bimetal 4 are in contact with each other, and the movable piece 3, the bimetal 4, the PTC thermistor 5 and the fixed piece 2 are electrically connected as a circuit. However, since the resistance of the PTC thermistor 5 is overwhelmingly larger than the resistance of the movable piece 3, the current flowing through the PTC thermistor 5 is completely ignored compared to the amount flowing through the fixed contact 21 and the movable contact 31. It is possible.

図4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。過充電又は異常により高温状態となると、PTCサーミスター5が過熱され、動作温度に達したバイメタル4は反転し、可動片3の第1弾性部34が押し上げられて固定接点21と可動接点31とが離反する。このとき、固定接点21と可動接点31の間を流れていた電流は遮断され、僅かな漏れ電流がバイメタル4及びPTCサーミスター5を通して流れることとなる。PTCサーミスター5は、このような漏れ電流の流れる限り発熱を続け、バイメタル4を反転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31の間経路を流れず、上述の僅かな漏れ電流のみが存在する。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. 4 shows the operation of the breaker 1 in an overcharged state or an abnormality. When the PTC thermistor 5 is overheated due to overcharge or abnormal condition, the bimetal 4 that has reached the operating temperature is reversed, and the first elastic portion 34 of the movable piece 3 is pushed up, and the fixed contact 21 and the movable contact 31 Are separated. At this time, the current flowing between the fixed contact 21 and the movable contact 31 is interrupted, and a slight leakage current flows through the bimetal 4 and the PTC thermistor 5. Since the PTC thermistor 5 continues to generate heat as long as such a leakage current flows, and the resistance value is drastically increased while maintaining the bimetal 4 in the inverted state, the current does not flow through the path between the fixed contact 21 and the movable contact 31. There is only a small leakage current as described above. 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5の発熱もなくなり、バイメタル4は復帰温度に戻り正転形状に復元する。そして、可動片3の第1弾性部34の弾性力によって可動接点31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3に示す導通状態に復帰する。   When the overcharge state is canceled or the abnormal state is resolved, the PTC thermistor 5 is no longer heated, and the bimetal 4 returns to the return temperature and is restored to the normal rotation shape. Then, the movable contact 31 and the fixed contact 21 come into contact again by the elastic force of the first elastic portion 34 of the movable piece 3, the circuit is released from the interruption state, and returns to the conduction state shown in FIG.

図5は、可動片3及びケース本体61の構成を拡大して示している。本発明の可動片3にあっては、固定部33を挟んで、可動接点31の側に第1弾性部34が、端子32の側に第2弾性部35が形成されている。そして、図中ハッチングで示した固定部33はケース本体61及び蓋部材62によって上下から挟み込まれて強固に固定され、かつその外側の端子32の側に第1弾性部34よりも弾性係数の低い第2弾性部35が形成されているので、ブレーカー1の製造、搬送又は二次電池への組み込み工程において可動片3の端子32に外力や衝撃が加えられても、第2弾性部35によって吸収されることとなり、可動接点31の位置が適正に維持される。その結果、固定接点21と可動接点31との接触位置が適正に維持されて、接触抵抗を安定して抑制することが可能となり、ブレーカー1のさらなる小型化を図ることができる。   FIG. 5 shows an enlarged configuration of the movable piece 3 and the case main body 61. In the movable piece 3 of the present invention, the first elastic portion 34 is formed on the movable contact 31 side and the second elastic portion 35 is formed on the terminal 32 side with the fixed portion 33 interposed therebetween. And the fixing | fixed part 33 shown by hatching in the figure is pinched | interposed from the upper and lower sides by the case main body 61 and the cover member 62, and is firmly fixed, and the elastic coefficient is lower than the 1st elastic part 34 at the side of the terminal 32 of the outer side. Since the second elastic portion 35 is formed, even if an external force or an impact is applied to the terminal 32 of the movable piece 3 in the process of manufacturing, transporting, or incorporating the breaker 1 into the secondary battery, the second elastic portion 35 absorbs it. As a result, the position of the movable contact 31 is properly maintained. As a result, the contact position between the fixed contact 21 and the movable contact 31 is properly maintained, the contact resistance can be stably suppressed, and the breaker 1 can be further reduced in size.

本実施形態においては、金属板のプレス加工によって可動片3を形成する際に、同時に打ち抜くことにより第2弾性部35に貫通孔36及び切り欠き37を形成している。これにより、第2弾性部35から可動接点31に至る可動片3の延出方向に垂直な平面(図中ZX平面)で切った第2弾性部35における断面積が、第1弾性部34における断面積よりも小さくなり、容易に第1弾性部34よりも弾性係数の低い第2弾性部35を形成することが可能となる。特に、可動片3の幅方向(図中X方向)において、貫通孔36の幅寸法(直径)をW1、第2弾性部35の幅寸法をW2とすると、W1:W2−W1が1.5:1乃至1:1.5となるように貫通孔36の直径が設定されている。このように貫通孔36の直径を設定することにより、第2弾性部35による衝撃等の吸収効果をより一層高めることができる。また、貫通孔36が円形に形成されているので、第2弾性部35に生ずる応力の集中を緩和することができ、第2弾性部35における可動片3の破損を抑制することができる。   In the present embodiment, when the movable piece 3 is formed by pressing a metal plate, the through hole 36 and the notch 37 are formed in the second elastic portion 35 by punching at the same time. Thereby, the cross-sectional area of the second elastic portion 35 cut by a plane (ZX plane in the drawing) perpendicular to the extending direction of the movable piece 3 extending from the second elastic portion 35 to the movable contact 31 is the same as that of the first elastic portion 34. It becomes smaller than a cross-sectional area, and it becomes possible to form the 2nd elastic part 35 whose elastic modulus is lower than the 1st elastic part 34 easily. In particular, in the width direction of the movable piece 3 (X direction in the drawing), if the width dimension (diameter) of the through hole 36 is W1 and the width dimension of the second elastic portion 35 is W2, W1: W2-W1 is 1.5. The diameter of the through hole 36 is set so as to be 1 to 1: 1.5. By setting the diameter of the through hole 36 in this manner, the absorption effect such as impact by the second elastic portion 35 can be further enhanced. Further, since the through hole 36 is formed in a circular shape, the concentration of stress generated in the second elastic portion 35 can be alleviated, and damage to the movable piece 3 in the second elastic portion 35 can be suppressed.

また、第2弾性部35、貫通孔36及び切り欠き37が、可動片の延出方向(図中Y方向)に対して対称に形成されている。これにより、可動片3の端子32を捻るような外力や衝撃が、いずれの回転方向に加えられても、第2弾性部35によって同様に吸収することができ、可動接点31の位置をより一層適正に維持できるようになる。なお、固定部33は、可動片3の幅方向に翼状に延出されており、これにより固定部33の弾性係数は第1弾性部34よりも高められている。   Moreover, the 2nd elastic part 35, the through-hole 36, and the notch 37 are formed symmetrically with respect to the extending direction (Y direction in a figure) of a movable piece. Thereby, even if an external force or impact that twists the terminal 32 of the movable piece 3 is applied in any rotation direction, it can be similarly absorbed by the second elastic portion 35, and the position of the movable contact 31 is further increased. It can be maintained properly. Note that the fixed portion 33 extends in a wing shape in the width direction of the movable piece 3, whereby the elastic coefficient of the fixed portion 33 is higher than that of the first elastic portion 34.

また、ケース本体61には、可動片3の切り欠き37の端縁と当接し、可動片3を位置決めするための斜面状の凸部65が形成されているので、可動片3をケース本体61に組み込む際に凸部65の斜面に沿って可動片3の切り欠き37の端縁を落下させつつ、貫通孔36を突起64に係合させることにより、可動片3をケース本体61に容易かつ正確に案内し組み込むことができる。特に本実施形態においては、貫通孔36に挿入されて係合される円筒状の突起64を挟んで一対の凸部65が形成されているので、突起64を軸とした可動片3の回転を防止できるので、平面視における固定接点21に対する可動接点31の位置を正確なものとすることができる。これにより、生産効率の向上を図りつつ、可動接点31の位置をより一層適正に維持できるようになる。   Further, the case body 61 is formed with a sloped convex portion 65 for contacting the edge of the notch 37 of the movable piece 3 and positioning the movable piece 3. The movable piece 3 can be easily attached to the case body 61 by engaging the through-hole 36 with the projection 64 while dropping the edge of the notch 37 of the movable piece 3 along the slope of the convex portion 65 when assembled into the case 65. It can be guided and incorporated accurately. In particular, in the present embodiment, since the pair of convex portions 65 are formed with the cylindrical projection 64 inserted and engaged in the through hole 36, the movable piece 3 is rotated about the projection 64 as an axis. Since it can prevent, the position of the movable contact 31 with respect to the fixed contact 21 in planar view can be made accurate. Thereby, the position of the movable contact 31 can be maintained more appropriately while improving the production efficiency.

また、斜面状の凸部65が平面視で半円状にケース本体端面66から突出して形成されているので、凸部65による上述した効果を享受しつつ、凸部65を設けたことによるケース本体端面66と蓋部材62との接触面積の減少を抑制することができる。これにより、ケース本体61と蓋部材62とを強固に溶着等することが可能となりケース6の堅牢性・密封性が高められ、第1弾性部34と第2弾性部35との間の固定部33において可動片3の固定を強固なものとすることができる。なお、平面視で半円状に突出する凸部65は、ケース本体61の樹脂成形の際に樹脂の流れ込みも良好で、ブレーカー1の生産性が阻害されることはない。また、凸部65は、開口63の側すなわち可動接点31の側に斜面を有するので、可動接点31をより一層正確に位置決めできるようになる。また、凸部65よりも外側(端子32の側)においてケース本体端面66の面積を大きくできるので、ケース6の密封性が高められ、水分、電解液その他のブレーカーにとって好ましくない侵入物がケース6の内部に侵入する虞を低減できる。また、第1弾性部34よりも弾性係数の大きい固定部33が凸部65と係合するので、固定部33の固定をより正確かつ強固なものとすることができ、可動片3の姿勢が安定する。   In addition, since the sloped convex portion 65 is formed so as to protrude from the case main body end surface 66 in a semicircular shape in plan view, the case in which the convex portion 65 is provided while enjoying the above-described effects of the convex portion 65. A decrease in the contact area between the main body end surface 66 and the lid member 62 can be suppressed. As a result, the case main body 61 and the lid member 62 can be firmly welded and the like, and the robustness and sealing performance of the case 6 can be enhanced, and the fixing portion between the first elastic portion 34 and the second elastic portion 35 can be obtained. In 33, the movable piece 3 can be fixed firmly. In addition, the convex part 65 protruding in a semicircular shape in a plan view has a good resin flow when the case body 61 is molded with the resin, and the productivity of the breaker 1 is not hindered. Moreover, since the convex part 65 has a slope on the opening 63 side, that is, on the movable contact 31 side, the movable contact 31 can be positioned more accurately. Further, since the area of the case main body end surface 66 can be increased outside the convex portion 65 (on the terminal 32 side), the sealing performance of the case 6 is improved, and intruders that are undesirable for moisture, electrolyte, and other breakers are present in the case 6. It is possible to reduce the possibility of intruding into the interior. In addition, since the fixed portion 33 having a larger elastic coefficient than the first elastic portion 34 is engaged with the convex portion 65, the fixed portion 33 can be fixed more accurately and firmly, and the posture of the movable piece 3 can be improved. Stabilize.

また、第2弾性部35は、蓋部材62をケース本体61に装着したときに、ケース6の内部に収容されるように配置されているので、第2弾性部35における可動片3の破損を抑制できる。また、ケース本体61と蓋部材62によって挟み込まれて固定される固定部33よりも外側の端子32の側に第2弾性部35が形成されているので、端子32に加えられた衝撃は第2弾性部35によって吸収され、ケース6が破損する虞を少なくすることができる。   Further, since the second elastic portion 35 is disposed so as to be housed inside the case 6 when the lid member 62 is attached to the case main body 61, the movable piece 3 in the second elastic portion 35 is prevented from being damaged. Can be suppressed. Further, since the second elastic portion 35 is formed on the terminal 32 side outside the fixing portion 33 sandwiched and fixed by the case body 61 and the lid member 62, the impact applied to the terminal 32 is the second. The possibility that the case 6 is damaged by being absorbed by the elastic portion 35 can be reduced.

なお、本発明は上記実施形態の構成に限られることなく、少なくとも固定片2と、可動片3と、バイメタル4と、ケース6とを備えたブレーカーにおいて、可動片3は、第1弾性部34よりも弾性係数の低い第2弾性部35とを有し、第1弾性部34と第2弾性部35との間の固定部33においてケース6によって固定されている構成であればよい。また、本発明は種々の変形が可能であり、例えば、図6は、可動片3の別の形態を示している。可動片30は、第2弾性部35から貫通孔36を廃すると共に、切り欠き37のY方向への寸法を大きく設定している。本形態においても、Z−X平面で切った第2弾性部35における断面積が減少し、第2弾性部35における弾性係数を第1弾性部34よりも低くすることができる。また、プレス加工において、第2弾性部35の厚み寸法を減少させることにより、Z−X平面で切った第2弾性部35における断面積を減少させて、第2弾性部35における弾性係数を第1弾性部34よりも低くしてもよい。また、可動片3をバイメタル又はトリメタルによって形成することにより、可動片3と熱応動素子4を一体的に形成する形態としてもよい。この場合、ブレーカーの構成をより簡素なものとすると共に、さらなる小型化を図ることも可能となる。また、凸部65は、平面視で半円状に開口63の側に斜面が形成されているのが最も望ましいが、平面視で満月状乃至四半分の扇形状であってもよい。四半分の扇形状とした場合は、凸部65による可動片3の案内機能を維持しつつ蓋部材62とケース本体端面66との接触面積を大きくすることが可能となり、ケースの堅牢性・密封性を高めることができる。   The present invention is not limited to the configuration of the above embodiment, and in the breaker including at least the fixed piece 2, the movable piece 3, the bimetal 4, and the case 6, the movable piece 3 includes the first elastic portion 34. The second elastic portion 35 having a lower elastic modulus than the first elastic portion 34 and the fixing portion 33 between the first elastic portion 34 and the second elastic portion 35 may be fixed by the case 6. The present invention can be modified in various ways. For example, FIG. 6 shows another form of the movable piece 3. In the movable piece 30, the through hole 36 is eliminated from the second elastic portion 35, and the dimension of the notch 37 in the Y direction is set large. Also in this embodiment, the cross-sectional area of the second elastic portion 35 cut along the ZX plane is reduced, and the elastic coefficient of the second elastic portion 35 can be made lower than that of the first elastic portion 34. Further, in the press working, by reducing the thickness dimension of the second elastic portion 35, the cross-sectional area of the second elastic portion 35 cut along the ZX plane is reduced, and the elastic modulus of the second elastic portion 35 is changed to the first elastic coefficient. You may make it lower than the 1 elastic part 34. FIG. Alternatively, the movable piece 3 and the thermally responsive element 4 may be integrally formed by forming the movable piece 3 of bimetal or trimetal. In this case, the breaker can be made simpler and further downsized. In addition, it is most desirable that the convex portion 65 has a semicircular shape in a plan view and a slope is formed on the side of the opening 63, but may be a full moon shape or a quadrant fan shape in a plan view. In the case of a quadrant fan shape, it is possible to increase the contact area between the lid member 62 and the case body end surface 66 while maintaining the guiding function of the movable piece 3 by the convex portion 65, and thus the robustness and sealing of the case Can increase the sex.

図7は、図1に示した組み立て前のケース本体61において、突起64を含むZ−X平面で切断した断面を示している。突起64は、蓋部材62の裏面と接合される頂部64aと、可動片3の貫通孔36と係合される側面64bと、頂部64aと側面64bとの間に形成された斜面状のテーパー部64cを有している。このテーパー部64cは、可動片3をケース本体61に組み込む際に、斜面状の凸部65と共に可動片3を位置決めする機能を有する。すなわち、可動片3の貫通孔36の端縁をテーパー部64cの斜面に沿って滑らしながら落下させることにより、斜面状の凸部65による位置決め効果と相まって、可動片3をケース本体61に容易かつ正確に案内し、載置することができる。これにより、ブレーカーの組み立てラインの一時的な停止等を防止することが可能になり、生産効率の向上を図ることができる。また、突起64の頂部64aが蓋部材62の裏面と接合されるので、ケース本体61と蓋部材62とを超音波溶着する際に両者の接合面積が増大し、ケース6の強度をより一層強固にすることができる。   FIG. 7 shows a cross section of the case body 61 before assembly shown in FIG. 1 cut along the ZX plane including the protrusions 64. The protrusion 64 includes a top portion 64a joined to the back surface of the lid member 62, a side surface 64b engaged with the through-hole 36 of the movable piece 3, and a sloped tapered portion formed between the top portion 64a and the side surface 64b. 64c. The tapered portion 64 c has a function of positioning the movable piece 3 together with the sloped convex portion 65 when the movable piece 3 is incorporated into the case body 61. That is, by dropping the end edge of the through hole 36 of the movable piece 3 while sliding along the inclined surface of the tapered portion 64c, the movable piece 3 can be easily and easily attached to the case body 61 in combination with the positioning effect of the inclined convex portion 65. It can be guided and placed accurately. This makes it possible to prevent a temporary stop of the breaker assembly line and improve production efficiency. Moreover, since the top part 64a of the protrusion 64 is joined to the back surface of the lid member 62, when the case main body 61 and the lid member 62 are ultrasonically welded, the joint area between the two increases, and the strength of the case 6 is further increased. Can be.

なお、テーパー部64c及び凸部65の斜面の傾きは一定であるものに限られることなく、高さに応じて変化するように構成されていてもよい。例えば、図8に示すように、テーパー部64c及び凸部65の斜面が、凸曲面状に形成されていてもよい。また、テーパー部64c及び凸部65の斜面が、凹曲面状に形成されていてもよい。このように、斜面状のテーパー部64c及び凸部65は、傾きが一定であるものに限られない。   Note that the slopes of the inclined surfaces of the tapered portion 64c and the convex portion 65 are not limited to being constant, and may be configured to change according to the height. For example, as shown in FIG. 8, the inclined surfaces of the tapered portion 64c and the convex portion 65 may be formed in a convex curved surface shape. Further, the inclined surfaces of the tapered portion 64c and the convex portion 65 may be formed in a concave curved surface shape. Thus, the inclined tapered portion 64c and the convex portion 65 are not limited to those having a constant inclination.

1 ブレーカー
2 固定片
3 可動片
4 熱応動素子(バイメタル)
6 ケース
21 固定接点
22 端子
31 可動接点
32 端子
33 固定部
34 第1弾性部
35 第2弾性部
36 貫通孔
37 切り欠き
61 ケース本体
62 蓋部材
63 開口
64 突起
64c テーパー部
65 凸部
DESCRIPTION OF SYMBOLS 1 Breaker 2 Fixed piece 3 Movable piece 4 Thermally responsive element (bimetal)
6 Case 21 Fixed contact 22 Terminal 31 Movable contact 32 Terminal 33 Fixed part 34 First elastic part 35 Second elastic part 36 Through hole 37 Notch
61 Case body 62 Lid member 63 Opening 64 Projection 64c Taper part 65 Projection part

Claims (7)

固定接点を有する固定片と、可動接点を有し、この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接点が前記固定接点から離反するように前記可動片を作動させる熱応動素子と、前記固定片、可動片及び熱応動素子を収容するケースとを備えたブレーカーにおいて、
前記可動片は、
前記ケースの外側に突出される端子と、前記可動接点を前記固定接点に押圧するための弾性力を発生する第1弾性部と、前記第1弾性部と前記端子との間に形成された第2弾性部とを有し、
前記第2弾性部における前記可動片の延出方向に垂直な平面で切った断面積が、前記第1弾性部における前記可動片の延出方向に垂直な平面で切った断面積よりも小さいことを特徴とするブレーカー。
A fixed piece having a fixed contact, a movable piece having a movable contact, the movable piece pressing the movable contact against the fixed contact, and the movable contact moving away from the fixed contact by being deformed as the temperature changes. In a breaker comprising a thermally responsive element that operates the movable piece as described above, and a case that houses the fixed piece, the movable piece, and the thermally responsive element,
The movable piece is
A terminal projecting to the outside of the case; a first elastic portion for generating an elastic force for pressing the movable contact against the fixed contact; and a first formed between the first elastic portion and the terminal. Two elastic parts,
The cross-sectional area of the second elastic portion cut by a plane perpendicular to the extending direction of the movable piece is smaller than the cross-sectional area of the first elastic portion cut by a plane perpendicular to the extending direction of the movable piece. Breaker characterized by.
前記可動片は、前記第1弾性部と前記第2弾性部との間で前記可動片の幅方向に翼状に延出され、前記ケースによって固定される固定部と、前記固定部と前記端子の間に形成された貫通孔を有することを特徴とする請求項1に記載のブレーカー。   The movable piece extends in a wing shape in the width direction of the movable piece between the first elastic portion and the second elastic portion, and is fixed by the case, the fixed portion, and the terminal The breaker according to claim 1, further comprising a through hole formed therebetween. 前記可動片は、前記固定部における前記可動片の延出方向に垂直な幅寸法が、前記第2弾性部における前記可動片の延出方向に垂直な幅寸法よりも大きいことを特徴とする請求項1又は請求項2に記載のブレーカー。   The movable piece has a width dimension perpendicular to the extending direction of the movable piece in the fixed part larger than a width dimension perpendicular to the extending direction of the movable piece in the second elastic part. The breaker of Claim 1 or Claim 2. 前記固定部は、前記可動片の幅方向に翼状に延出された部分の両端領域及びその中間領域において前記ケースによって固定されていることを特徴とする請求項1乃至請求項3のいずれか一項に記載のブレーカー。   4. The fixing unit according to claim 1, wherein the fixing part is fixed by the case in both end regions and intermediate regions of a portion extending in a wing shape in the width direction of the movable piece. Breaker according to item. 前記固定部は、前記可動片の幅方向において前記第2弾性部より外側に位置する両端領域と、前記第2弾性部と重複する中央領域において、前記ケースによって固定されていることを特徴とする請求項1乃至請求項3のいずれか一項に記載のブレーカー。   The fixed portion is fixed by the case in both end regions located outside the second elastic portion in the width direction of the movable piece and in a central region overlapping the second elastic portion. The breaker as described in any one of Claims 1 thru | or 3. 前記ケースは、前記可動片の貫通孔に係合される突起を有することを特徴とする請求項2に記載のブレーカー。   The breaker according to claim 2, wherein the case has a protrusion engaged with the through hole of the movable piece. 請求項1乃至請求項6のいずれか一項に記載のブレーカーを備えたことを特徴とする二次電池。   A secondary battery comprising the breaker according to any one of claims 1 to 6.
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CN102782793A (en) 2012-11-14
JPWO2011105175A1 (en) 2013-06-20

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