JP2005158682A - Thermal protector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thermal protector which uses a positive temperature coefficient (PTC) element, through which heat is surely transmitted to a thermally actuated element of the PTC element. <P>SOLUTION: The thermal protector comprises: a fixed piece having a fixed contact; a movable piece having a movable contact at the end and made of a thermally actuated element which makes the movable contact come into contact with the fixed contact and flip so as to take the movable contact away from the fixed contact at a predetermined temperature; a PTC element connected to the fixed piece; and a insulating housing containing the fixed piece, the fixed contact, the movable contact, the movable piece and the PTC element, having a main part and a lid joined to the main part. The PTC element is placed adjacent to the inversion center of the movable piece so that the current path from the fixed piece to the movable piece through the contact is converted into a path from the fixed piece to the movable piece through the PTC element by inversion of the movable piece. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、所定の作動温度に達したときの熱応動素子の反転作用により、可動接点を固定接点から離反させて回路を遮断する構造のサーマルプロテクタに関するものである。   The present invention relates to a thermal protector having a structure in which a movable contact is separated from a fixed contact and a circuit is shut off by a reversal action of a thermally responsive element when a predetermined operating temperature is reached.

この種のサーマルプロテクタは、一般に各種モータ、各種機器類に用いられている二次電池などの過電流や過熱に対して、回路を遮断する保護部品として使用される。
後記の特許文献には、固定接点が取り付けられた導電性固定板（固定片）と、先端部に可動接点が取り付けられ弾性により当該可動接点を固定接点に接触させる熱応動素子（バイメタル、トリメタル等）と、熱応動素子に接続された導電性可動板（可動片）とを絶縁性のケース内に封入し、導電性固定板と導電性可動板にはそれぞれケース外に延び出す端子部を設け、前記導電性固定板と導電性可動板とを正特性サーミスタ（以下「ＰＴＣ素子」という。）を介して接続したサーマルプロテクタ（自己保持型過電流保護装置）が記載されている。
サーマルプロテクタは機器類等の電気回路内に取り付けられ、過電流により周囲温度が熱応動素子の作動温度以上に達すると、熱応動素子が反転することにより可動接点が固定接点から離反し、両接点を通じて形成された回路が遮断される。 This type of thermal protector is generally used as a protective component that interrupts the circuit against overcurrent and overheating of secondary batteries used in various motors and various devices.
In the patent document described later, there is a conductive fixed plate (fixed piece) to which a fixed contact is attached, and a thermally responsive element (bimetal, trimetal, etc.) that has a movable contact attached to the tip and elastically contacts the movable contact with the fixed contact. ) And a conductive movable plate (movable piece) connected to the thermally responsive element is enclosed in an insulating case, and each of the conductive fixed plate and the conductive movable plate is provided with terminal portions that extend out of the case. A thermal protector (self-holding overcurrent protection device) in which the conductive fixed plate and the conductive movable plate are connected via a positive temperature coefficient thermistor (hereinafter referred to as “PTC element”) is described.
The thermal protector is installed in electrical circuits such as equipment, and when the ambient temperature reaches the operating temperature of the thermal actuator due to overcurrent, the thermal actuator reverses and the movable contact separates from the fixed contact. The circuit formed through is interrupted.

両接点が離反すると、両接点が接続しているときは電流が流れない電気抵抗の大きいＰＴＣ素子を通じて電流が流れる。ＰＴＣ素子は、通電→発熱→電気抵抗増大→通電量減少→温度低下→電気抵抗減少→通電量増大→発熱、の作用によって定温発熱体として機能するから、熱応動素子の作動温度以上の温度を保つＰＴＣ素子を使用することにより、サーマルプロテクタは、所定の操作により前記両接点が接続しない限り、前記両接点を通じて形成される電気回路を遮断した状態を保ち続けるので、機器類を過電流や高熱から安定的に保護することができる。
しかし、前記のサーマルプロテクタは、定温発熱体であるＰＴＣ素子と当該ＰＴＣ素子の熱によって反転状態を維持する熱応動素子とが離れており、両者間に熱が伝わり難いという問題があった。
特開平７−４５１６９号 When the two contacts are separated from each other, a current flows through a PTC element having a large electrical resistance that does not flow when both the contacts are connected. The PTC element functions as a constant temperature heating element by the action of energization → heat generation → increase in electrical resistance → decrease in energization → temperature decrease → decrease in electrical resistance → increase in energization → heat generation. By using the PTC element to keep, the thermal protector keeps the state where the electric circuit formed through the two contacts is cut off unless the two contacts are connected by a predetermined operation. Can be stably protected from.
However, the thermal protector has a problem that the PTC element, which is a constant temperature heating element, is separated from the thermally responsive element that maintains the inverted state by the heat of the PTC element, and it is difficult for heat to be transmitted between the two.
JP 7-45169 A

本発明が解決しようとする課題は、ＰＴＣ素子を用いたサーマルプロテクタにおいて、ＰＴＣ素子の熱が熱応動素子に伝わり難い点であり、この点が改善されたサーマルプロテクタを提供することにある。   The problem to be solved by the present invention is that in a thermal protector using a PTC element, the heat of the PTC element is not easily transmitted to the thermally responsive element, and there is an object to provide a thermal protector in which this point is improved.

本発明に係るサーマルプロテクタの一つは、前記の課題を解決するため、固定接点を有する固定片と、先端部に有する可動接点をバネ作用により前記固定接点へ接触させ、かつ所定の作動温度で反転して前記可動接点が前記固定接点から離反させる熱応動素子からなる可動片と、前記固定片に接続されたＰＴＣ素子と、前記固定片，固定接点，可動接点，可動片及びＰＴＣ素子を収容し、かつ、本体と当該本体へ接合された蓋体とからなる絶縁性のケースと、前記固定片と一体に連続し又は接続され前記ケースの外部に現われた端子部と、前記可動片と接続され前記ケースの外部に現われた端子片と、を備え、前記可動片の反転中心部は可動接点の取付位置と固定側端部とのほぼ中間に位置し、前記ＰＴＣ素子は前記可動片の反転中心部と近接して配設されていることを主要な特徴としている。   In order to solve the above problems, one of the thermal protectors according to the present invention is to bring a fixed piece having a fixed contact and a movable contact at the tip portion into contact with the fixed contact by a spring action, and at a predetermined operating temperature. A movable piece comprising a thermally responsive element that reverses and moves the movable contact away from the fixed contact, a PTC element connected to the fixed piece, and the fixed piece, the fixed contact, the movable contact, the movable piece, and the PTC element are accommodated. And an insulating case composed of a main body and a lid joined to the main body, a terminal portion that is continuous with or connected to the fixed piece and appears outside the case, and connected to the movable piece And a terminal piece appearing outside the case, the reversal center portion of the movable piece being located approximately in the middle between the mounting position of the movable contact and the fixed side end, and the PTC element is a reversal of the movable piece. Near center It is mainly characterized in that it is provided with.

本発明に係るサーマルプロテクタの他の一つは、前記の課題を解決するため、固定接点を有する固定片と、先端部に有する可動接点をバネ作用により前記固定接点へ接触させる可動片と、所定の作動温度で反転して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、前記固定片に接続されたＰＴＣ素子と、前記固定片，固定接点，可動接点，可動片，熱応動素子及びＰＴＣ素子を収容し、かつ本体と当該本体へ接合された蓋体とからなる絶縁性のケースと、前記固定片と一体に連続し又は接続され前記ケースの外部に現われた端子部と、前記可動片と一体に連続し又は接続され前記ケースの外部に現われた端子片と、を備え、前記可動片の可動接点の取付位置と固定側端部とのほぼ中間位置と、前記熱応動素子の反転中心部とは近接し、前記ＰＴＣ素子は前記熱応動素子の反転中心部と近接して配設されていることを主要な特徴としている。   In order to solve the above problems, another thermal protector according to the present invention includes a fixed piece having a fixed contact, a movable piece for bringing the movable contact at the tip portion into contact with the fixed contact by a spring action, and a predetermined piece. And a PTC element connected to the fixed piece, the fixed piece, the fixed contact, and the movable contact. The thermal response element operates the movable piece so that the movable contact is separated from the fixed contact. , A movable piece, a thermally responsive element and a PTC element, and an insulating case composed of a main body and a lid joined to the main body, and the fixed piece integrally or continuously connected to the outside of the case A terminal portion that appears, and a terminal piece that is continuous with or connected to the movable piece and appears outside the case, and a substantially intermediate position between the mounting position of the movable contact of the movable piece and the fixed side end. And the thermal response Close the inversion center of the element, the PTC element are mainly characterized in that it is disposed near the inversion center of the heat responsive element.

本発明に係るサーマルプロテクタは、熱応動素子からなる可動片又は熱応動素子の反転作動により、両接点が開いたとき、ＰＴＣ素子が熱応動素子の反転中心部と近接して配設されているので、ＰＴＣ素子の熱が熱応動素子に伝わり易く、より安定して作動する。   In the thermal protector according to the present invention, the PTC element is disposed in the vicinity of the reversal center portion of the thermally responsive element when both the contacts are opened by the reversal operation of the movable piece made of the thermally responsive element or the thermally responsive element. Therefore, the heat of the PTC element is easily transferred to the thermally responsive element and operates more stably.

以下図面を参照しながら、本発明に係るサーマルプロテクタの好ましい実施形態を説明する。
図１は本発明の一実施形態に係るサーマルプロテクタ（請求項１に対応）を携帯電話機の二次電池（リチウムイオン電池）に取り付けた状態の部分断面図、図２は本発明の一実施形態に係るサーマルプロテクタを携帯電話機の二次電池に取り付けた状態の部分斜視図、図３は図１のサーマルプロテクタの分解平面図、図４はケースの蓋体の底面（裏面）図、図５は図４の矢印Ａ−Ａに沿う部分拡大断面図、図６は図１のサーマルプロテクタの接点が開いた状態の断面図である。 Hereinafter, preferred embodiments of a thermal protector according to the present invention will be described with reference to the drawings.
FIG. 1 is a partial sectional view of a state in which a thermal protector (corresponding to claim 1) according to an embodiment of the present invention is attached to a secondary battery (lithium ion battery) of a mobile phone, and FIG. 2 is an embodiment of the present invention. FIG. 3 is an exploded plan view of the thermal protector of FIG. 1, FIG. 4 is a bottom (back) view of the case lid, and FIG. 5 is a perspective view of the thermal protector according to FIG. 4 is a partially enlarged cross-sectional view taken along the arrow AA in FIG. 4, and FIG. 6 is a cross-sectional view in a state where the contact of the thermal protector in FIG. 1 is opened.

全体としてほぼ直方体形状である絶縁性のケース１は、図示しない携帯電話機における二次電池８の取付面の幅（電池の厚み）とほぼ同じ幅を有し、本体１０と当該本体１０へ密閉状に接合された蓋体１１とから構成されている。後述の外部端子板６を含めたサーマルプロテクタの二次電池８への取付状態（図２）では、サーマルプロテクタの平面形状及び平面寸法は、二次電池８の取付端面の平面形状及び平面寸法とほぼ一致している。ここで、外部端子板を含めたサーマルプロテクタ又はケース１の平面形状及び平面寸法が二次電池８の取付端面の平面形状及び平面寸法とほぼ等しいか、２次電池の取付端面内に収まる平面形状及び平面寸法であることが望ましいが、両者がほぼ相似形状であれば取付端面寸法より前者が極く僅かに大きいことも許容される。また、その他の形態としては、外部端子板６を含めたサーマルプロテクタ又はケース１の幅が少なくとも二次電池８の取付端面の厚さとほぼ等しいか、それより小さいことが望ましい。二次電池８との組立性を考慮した場合に外部端子板６を含めたサーマルプロテクタ又はケース１の平面形状及び平面寸法と二次電池８の取付端面の平面形状及び平面寸法の上記のような適合性が特に重要である。
本体１０と蓋体１１の接合面の一方には両端部に複数の位置決め孔１１３が形成され、他方には対応する位置決め孔１１３に挿入される位置決めピン１０３が形成されている。
ケース１内には、一端部上面に固定接点２が接続又はクラッドされている板状の固定片２０と、先端部に前記固定接点２と接触する可動接点３を有し、ばね性をもった熱応動素子（トリメタル又はバイメタル）４を兼ねる板状の可動片３０と、固定片２０に対して接触により接続しているＰＴＣ素子７が封入されている。
固定接点２と可動接点３は、可動片３０のばね作用により所定の圧力で接触しており、熱応動素子４を兼ねる可動片３０が反転作動することにより離反するように構成されている。蓋体１１の天井面には、可動片３０が反転作動したときにその先端部が突き当たる突起１１０が形成されている。 The insulating case 1 having a substantially rectangular parallelepiped shape as a whole has substantially the same width as the width (battery thickness) of the mounting surface of the secondary battery 8 in a mobile phone (not shown), and is sealed to the main body 10 and the main body 10. And a lid body 11 joined to each other. In the state of attachment of the thermal protector including the external terminal plate 6 to be described later to the secondary battery 8 (FIG. 2), the planar shape and planar dimension of the thermal protector are the same as the planar shape and planar dimension of the attachment end surface of the secondary battery 8. It almost matches. Here, the planar shape and planar dimension of the thermal protector or case 1 including the external terminal plate are substantially equal to the planar shape and planar dimension of the mounting end surface of the secondary battery 8, or the planar shape that fits within the mounting end surface of the secondary battery. However, if the two are substantially similar in shape, the former may be allowed to be slightly slightly larger than the mounting end face dimension. As another form, it is desirable that the width of the thermal protector including the external terminal plate 6 or the case 1 is at least approximately equal to or smaller than the thickness of the attachment end surface of the secondary battery 8. When considering the assemblability with the secondary battery 8, the planar shape and planar dimensions of the thermal protector or case 1 including the external terminal plate 6 and the planar shape and planar dimensions of the mounting end surface of the secondary battery 8 are as described above. Compatibility is particularly important.
A plurality of positioning holes 113 are formed on both ends of one of the joint surfaces of the main body 10 and the lid body 11, and positioning pins 103 to be inserted into the corresponding positioning holes 113 are formed on the other side.
The case 1 has a plate-like fixed piece 20 in which the fixed contact 2 is connected or clad on the upper surface of one end and a movable contact 3 that contacts the fixed contact 2 at the tip, and has a spring property. A plate-shaped movable piece 30 that also serves as a thermally responsive element (trimetal or bimetal) 4 and a PTC element 7 connected to the fixed piece 20 by contact are enclosed.
The fixed contact 2 and the movable contact 3 are in contact with each other at a predetermined pressure due to the spring action of the movable piece 30, and are configured to be separated when the movable piece 30 that also serves as the thermally responsive element 4 is reversed. A projection 110 is formed on the ceiling surface of the lid 11 so that the tip of the movable piece 30 abuts when the movable piece 30 is reversed.

板状の固定片２０はケース１の本体１０の底部へ埋め込み状に設けられ、その一端部には本体１０のほぼ中央部に形成された露出孔１００から延び出した端子部２１が一体に形成されている。この端子部２１は、サーマルプロテクタを二次電池８に取り付けて電池パックを構成する際、スポット溶接により二次電池８の負極８０に接続される。
端子部２１は、スポット溶接をし易くし接続の信頼性を向上を図るため、幅方向のほぼ中央部に長さ方向に沿ってスリット状の切欠部２１０（図３）を形成することにより平面視において二股状を呈している。端子部２１と外部電極とのスポット溶接性及び接続の信頼性を向上させるためには、図３のように二股状に形成することに代えて、図７で示すように端子部２１の幅方向のほぼ中央部に長さ方向に沿ってスリット状の孔２１１を形成してもよい。 The plate-like fixing piece 20 is embedded in the bottom of the main body 10 of the case 1, and a terminal portion 21 extending from an exposure hole 100 formed in the substantially central portion of the main body 10 is integrally formed at one end thereof. Has been. The terminal portion 21 is connected to the negative electrode 80 of the secondary battery 8 by spot welding when a thermal protector is attached to the secondary battery 8 to form a battery pack.
In order to facilitate spot welding and improve connection reliability, the terminal portion 21 is formed by forming a slit-shaped notch portion 210 (FIG. 3) along the length direction at a substantially central portion in the width direction. It has a bifurcated shape. In order to improve the spot weldability and the connection reliability between the terminal portion 21 and the external electrode, instead of forming a bifurcated shape as shown in FIG. 3, the width direction of the terminal portion 21 as shown in FIG. A slit-shaped hole 211 may be formed at substantially the center of the slit along the length direction.

熱応動素子４を兼ねる可動片３０は、反転作動部分がやや凸球面状又は凸円弧状になるように成形され、反転作動時に他の部材と緩衝しない限度ででき得る限り広い平面積を有するように設計されている。
可動片３０の固定側端部（本体１０と蓋体１１との挟まれた状態でケース１に固定されている部分）には、図３で示すように中央部に固定用の孔３２が形成され、この孔３２の両側に片方の位置決めピン１０３，１０３と対応する位置決め孔３３，３３が形成されている。可動片３０は、位置決めピン１０３，１０３が位置決め孔３３，３３に貫通した状態でその基端部が本体１０の上面周縁部の一端に固定されており、蓋体１１から延び出した接合片３１は、後述の第１の端子片５の蓋体１１から延び出した端部５１に対して溶接により接続されている。 The movable piece 30 that also serves as the thermally responsive element 4 is formed so that the reversal operation portion has a slightly convex spherical shape or a convex arc shape, and has a plane area as large as possible as long as it does not buffer with other members during the reversal operation. Designed to.
As shown in FIG. 3, a fixing hole 32 is formed in the center of the fixed side end portion of the movable piece 30 (the portion fixed to the case 1 with the main body 10 and the lid body 11 being sandwiched). Positioning holes 33 and 33 corresponding to one of the positioning pins 103 and 103 are formed on both sides of the hole 32. The movable piece 30 has a base end fixed to one end of the peripheral edge of the upper surface of the main body 10 with the positioning pins 103 and 103 passing through the positioning holes 33 and 33, and a joining piece 31 extending from the lid 11. Are connected by welding to an end 51 extending from the lid 11 of the first terminal piece 5 described later.

固定片２０には、熱応動素子を兼ねる可動片３０の反転中心部（図１で上方へやや突出している部分）又はその近傍の直下に近接するように、ＰＴＣ素子７の下面側電極が接触状態に接続されている。したがって、可動片３０は周囲温度が一定以上に上昇して反転すると、両接点２，３が開くとともに当該可動片３０がＰＴＣ素子７に所定の圧力で接触し、固定片２０と可動片３０とがＰＴＣ素子７を介して電気的に接続する。
この実施形態では、ケースの本体１０の内底面に固定片２０の上面が現われるようにＰＴＣ素子７とほぼ適合する平面形状の受入穴１０１を形成し、この受入穴１０１へＰＴＣ素子７を収容している。また、ＰＴＣ素子７がより一層安定した状態で固定片２０の上面へ接触するように、固定片２０の受入穴１０１から現われる部分に中心から等距離で等角度間隔に四個以上の突起状台座２００をプレス成形し、この各突起状台座２００にＰＴＣ素子７の裏面側電極を接触させている。この突起状台座２００は、ＰＴＣ素子７を安定させるためには四個以上必要であるが、ＰＴＣ素子７の安定性が得られる限り中心からの距離や角度間隔は限定されないが、等距離等角度間隔であるのが望ましい。
可動片３０の反転中心部は、可動接点３の取付位置と当該可動片３０の固定側端部とのほぼ中間にあり、ＰＴＣ素子７は可動片３０の反転中心部へ近接するように配設されている。 The fixed piece 20 is in contact with the lower surface side electrode of the PTC element 7 so as to come close to the reversal center portion of the movable piece 30 that also serves as a thermally responsive element (the portion that slightly protrudes upward in FIG. 1) or immediately below the vicinity. Connected to the state. Therefore, when the ambient temperature of the movable piece 30 rises above a certain level and reverses, both the contacts 2 and 3 are opened and the movable piece 30 comes into contact with the PTC element 7 with a predetermined pressure, and the fixed piece 20 and the movable piece 30 Are electrically connected via the PTC element 7.
In this embodiment, a receiving hole 101 having a planar shape substantially matching the PTC element 7 is formed so that the upper surface of the fixing piece 20 appears on the inner bottom surface of the main body 10 of the case, and the PTC element 7 is accommodated in the receiving hole 101. ing. Further, at least four projecting pedestals are equidistant from the center at the portion appearing from the receiving hole 101 of the fixing piece 20 so that the PTC element 7 comes into contact with the upper surface of the fixing piece 20 in a more stable state. 200 is press-molded, and the back side electrode of the PTC element 7 is brought into contact with each of the projecting pedestals 200. Four or more of these protruding pedestals 200 are necessary to stabilize the PTC element 7, but the distance from the center and the angular interval are not limited as long as the stability of the PTC element 7 is obtained, but the equidistant equiangular angle An interval is desirable.
The reversal center portion of the movable piece 30 is substantially in the middle between the mounting position of the movable contact 3 and the fixed side end portion of the movable piece 30, and the PTC element 7 is disposed so as to be close to the reversal center portion of the movable piece 30. Has been.

蓋体１１には、一面が外部上方に面するようにそれぞれ板状の第１の端子片５と第２の端子片５０及び外部端子板６が並べて固定されており、第１の端子片５と第２の端子片５０との間、第２の端子片５０と外部端子板６との間は、蓋体１１一部を形成する隔壁１１１，１１２によりそれぞれ絶縁されている。
前記外部端子板６は蓋体１１の端部から必要量延び出しており、その延び出した端部は、サーマルプロテクタを二次電池８に取り付けて電池パックを構成する際に当該二次電池の正極８１に接続される。 A plate-like first terminal piece 5, a second terminal piece 50 and an external terminal plate 6 are arranged and fixed on the lid body 11 so that one surface faces the outside upward. And the second terminal piece 50 and the second terminal piece 50 and the external terminal plate 6 are insulated from each other by partition walls 111 and 112 forming part of the lid 11.
The external terminal plate 6 extends from the end of the lid 11 by a required amount, and the extended end of the secondary battery 6 is attached to the secondary battery 8 to form a battery pack. Connected to the positive electrode 81.

蓋体１１の内側には、図４で示すように、第１の端子片５と第２の端子片５０との間の隔壁１１１をまたぎ、かつ各端子片５，５０の下面の一部が現われる状態に二つの孔１１４が並列的に形成されている。これらの孔１１４，１１４には電気部品５ａがそれぞれ収容され、それらの電気部品５ａはその上の第１の端子片５と第２の端子片５０へそれぞれ半田付け（Ｐｂフリー）により接続されている。
この実施形態において、二つの電気部品５ａの一方はコンデンサ，他方は抵抗であり、図１及び図２のように二次電池８にサーマルプロテクタを取り付け、サーマルプロテクタの端子片５，５０及び外部端子板６をそれぞれプローブ９０，９１，９２を通じて図示しない携帯電話機の回路と接続すると、並列接続されたコンデンサと抵抗により二次電池８の容量を検出することができる。
このように、サーマルプロテクタを電池と一体化して携帯電話機その他の機器類の回路内に組み込んだとき、サーマルプロテクタ内に電気部品５ａが接続されていると、機器類の中の基板に当該電気部品５ａを取り付ける必要がなく、機器類の基板の小型化を達成することができる。 Inside the lid 11, as shown in FIG. 4, a part of the lower surface of each terminal piece 5, 50 is straddled across the partition wall 111 between the first terminal piece 5 and the second terminal piece 50. Two holes 114 are formed in parallel so that they appear. These holes 114 and 114 accommodate electrical components 5a, respectively, and these electrical components 5a are respectively connected to the first terminal piece 5 and the second terminal piece 50 thereon by soldering (Pb-free). Yes.
In this embodiment, one of the two electrical components 5a is a capacitor, and the other is a resistor. A thermal protector is attached to the secondary battery 8 as shown in FIGS. 1 and 2, and the terminal pieces 5 and 50 of the thermal protector and external terminals are attached. When the plate 6 is connected to a circuit of a cellular phone (not shown) through the probes 90, 91 and 92, the capacity of the secondary battery 8 can be detected by a capacitor and a resistor connected in parallel.
As described above, when the thermal protector is integrated with the battery and incorporated in the circuit of the mobile phone or other device, if the electrical component 5a is connected to the thermal protector, the electrical component is attached to the substrate in the device. There is no need to attach 5a, and miniaturization of the substrate of the equipment can be achieved.

この実施形態において、ケース１の蓋体１１の周縁部上面は端子片５，５０及び外部端子板６の上面から所定量上方に突出している（端子片５，５０及び端子板６の上面が周縁部上面より沈んでいる）。すなわち、後述のように本体１０と蓋体１１とを超音波接合法によって接合する際に、超音波接合装置のアンビルと相対する図示しない加圧工具をその上面に接触振動させたとき、端子片５，５０及び端子板６の上面に傷が付くのを防止している。
符号１０２，１０４は溶接の便宜のための孔、１０５，１１５はゲート位置決めのための穴である。 In this embodiment, the upper surface of the peripheral portion of the lid 11 of the case 1 projects upward by a predetermined amount from the upper surfaces of the terminal pieces 5 and 50 and the external terminal plate 6 (the upper surfaces of the terminal pieces 5 and 50 and the terminal plate 6 are the peripheral edges). It is sinking from the top of the part). That is, when the main body 10 and the lid body 11 are joined by an ultrasonic joining method as will be described later, when a pressure tool (not shown) opposed to the anvil of the ultrasonic joining apparatus is contact-vibrated on its upper surface, the terminal piece 5 and 50 and the upper surface of the terminal board 6 are prevented from being damaged.
Reference numerals 102 and 104 are holes for the convenience of welding, and 105 and 115 are holes for gate positioning.

この実施形態において、固定接点２を含む固定片２０は、絶縁性樹脂からなる本体１０の内底面側へ埋め込み状になるようにインサート成形することにより、当該本体１０と一体化されている。
他方、第１の端子片５，第２の端子片５０及び外部端子板６は、絶縁性樹脂からなる蓋体１１とインサート成形することにより、当該蓋体１１と一体化されている。
サーマルプロテクタは、前述のようにそれぞれの部品が一体化されるように本体１０と蓋体１１とを成形した後、本体１０の受入穴１０１へＰＴＣ素子７を収容し、可動片３０の基端部を一部に挟んで本体１０の上に蓋体１１を超音波接合により密に接合し、可動片３０の接合片３１と第１の端子片５の外側の端部５１とを溶接することによって製造される。 In this embodiment, the fixed piece 20 including the fixed contact 2 is integrated with the main body 10 by insert molding so as to be embedded in the inner bottom surface side of the main body 10 made of an insulating resin.
On the other hand, the 1st terminal piece 5, the 2nd terminal piece 50, and the external terminal board 6 are integrated with the said cover body 11 by carrying out insert molding with the cover body 11 which consists of insulating resin.
The thermal protector forms the main body 10 and the lid body 11 so that the respective parts are integrated as described above, and then accommodates the PTC element 7 in the receiving hole 101 of the main body 10, and the base end of the movable piece 30. The lid body 11 is tightly joined on the main body 10 by ultrasonic joining with the part interposed therebetween, and the joining piece 31 of the movable piece 30 and the outer end portion 51 of the first terminal piece 5 are welded. Manufactured by.

ケース１の本体１０と蓋体１１は、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）その他の耐熱性に優れた樹脂を材質として成形される。特に二次電池８と一体化して電池パックを製造する場合には、２００℃以上の耐熱性を有する液晶ポリマーを使用するのが好ましい。
固定片２０及び端子部２１の材質は、純ニッケルが好ましいが、リン青銅，銅，Ｃｕ−Ｔｉ合金，Ｃｕ−Ｂｅ合金，洋白，黄銅，Ｃｕ−Ｎｉ−Ｓｉ合金等の導電性材料を用いることができる。
固定接点２及び可動接点３の材質は、ニッケル−銀合金であるのが好ましく、例えばニッケル１０ｍａｓｓ％を含む銀合金であるのが特に好ましい。しかし、これらの部品には、銅−銀合金、金−銀合金、炭素−銀合金、タングステン−銀合金等の接点材料を用いることができる。これらの接点２，３の固定片２０や可動片３０への接合は、クラッド，めっき，カシメその他具体的手段は問わない。
熱応動素子４を兼ねる可動片３０には、例えばＣｕ−Ｎｉ−Ｍｎ合金による高熱膨張金属材料と、Ｎｉ−Ｆｅ合金による低熱膨張金属材料とを積層させたものが使用される。 The main body 10 and the lid 11 of the case 1 are molded from polyphenylene sulfide (PPS), liquid crystal polymer (LCP), polybutylene terephthalate (PBT), or other resin having excellent heat resistance. In particular, when a battery pack is manufactured integrally with the secondary battery 8, it is preferable to use a liquid crystal polymer having heat resistance of 200 ° C. or higher.
The material of the fixed piece 20 and the terminal portion 21 is preferably pure nickel, but a conductive material such as phosphor bronze, copper, Cu—Ti alloy, Cu—Be alloy, white, brass, Cu—Ni—Si alloy is used. be able to.
The material of the fixed contact 2 and the movable contact 3 is preferably a nickel-silver alloy, and is particularly preferably a silver alloy containing, for example, 10 mass% nickel. However, a contact material such as a copper-silver alloy, a gold-silver alloy, a carbon-silver alloy, or a tungsten-silver alloy can be used for these parts. The contact points 2 and 3 may be joined to the fixed piece 20 or the movable piece 30 by any means such as cladding, plating, caulking, or other specific means.
For the movable piece 30 that also serves as the thermally responsive element 4, for example, a laminate of a high thermal expansion metal material made of Cu—Ni—Mn alloy and a low thermal expansion metal material made of Ni—Fe alloy is used.

機器の対応する電極と接触させる端子片５，５０及び端子板６の露出面には、接触状態における電気抵抗を小さくするため、湿式メッキや適当な蒸着手段などにより金を被覆することができる。被覆金属には金のほか、銀，銅，パラジウム及びニッケルの中の一又は二以上の元素を用いることができる。   The exposed surfaces of the terminal pieces 5 and 50 and the terminal plate 6 brought into contact with the corresponding electrodes of the device can be coated with gold by wet plating or appropriate vapor deposition means in order to reduce the electrical resistance in the contact state. In addition to gold, one or more elements among silver, copper, palladium and nickel can be used as the coating metal.

この実施形態のサーマルプロテクタは、図１及び図２で示すように二次電池８と一体化した状態で、携帯電話機その他の電子機器（図示しない）と二次電池８とが形成する電気回路において、所定の作動温度以上に達したとき前記固定接点２と可動接点３とが開いて前記電子機器と二次電池８と固定接点２と可動接点３とが形成する電気回路を遮断するようにセットされる。このような機器へのセット状態で、固定接点２と可動接点３とが閉じているときは両接点２，３を通じて固定片２０と可動片３０とが電気的に接続し、固定接点２と可動接点３とが開くとＰＴＣ素子７を通じて固定片２０と可動片３０とが電気的に接続するように、両接点２，３の開閉状態により電流経路が選択的に変更される。
すなわち、正常な状態では、図１のように可動片３０の弾性により可動接点３が固定接点２へ押し付けられた状態で接触し、両接点を含む電気回路は閉じられていて正常に電流が流れる。
他方、接点２，３間に異常な電流が流れるかあるいは他の原因によりケース１内の温度が上昇し、ケース１内の温度が熱応動素子４を兼ねる可動片３０の作動（反転）温度以上に達すると、当該可動片３０がスナップ作用により上方へ凹球面状（皿状）に反るように反転する。可動片３０がこのように反転作動することにより、図６のように可動接点３が固定接点２から離反して接点間の電流が遮断され、電気回路中には正常な電流が流れなくなる。
可動片３０が反転作動すると、当該可動片３０が反転によりＰＴＣ素子７へ所定の圧力で接触して当該ＰＴＣ素子７を固定片２０に押し付け、当該ＰＴＣ素子７を通じて固定片２０と可動片３０とが電気的に接続する。このとき、当該ＰＴＣ素子７の電気抵抗により電気回路中にわずかに電流が流れるのでＰＴＣ素子７が定温発熱して可動片３０の復帰を妨げ、接点２，３間の電流を遮断し続ける。したがって、電子機器の側からの操作がない限り、当該部位の温度低下による電気回路の正常状態への復帰は阻止され、回路の安全性が保たれる。 The thermal protector of this embodiment is an electric circuit formed by the secondary battery 8 and a mobile phone or other electronic device (not shown) in a state of being integrated with the secondary battery 8 as shown in FIGS. When the predetermined operating temperature is reached, the fixed contact 2 and the movable contact 3 are opened so that the electric circuit formed by the electronic device, the secondary battery 8, the fixed contact 2 and the movable contact 3 is cut off. Is done. When the fixed contact 2 and the movable contact 3 are closed in such a set state in the device, the fixed piece 20 and the movable piece 30 are electrically connected through the both contacts 2 and 3, and the fixed contact 2 and the movable contact 3 are movable. When the contact 3 is opened, the current path is selectively changed depending on the open / closed state of both the contacts 2 and 3 so that the fixed piece 20 and the movable piece 30 are electrically connected through the PTC element 7.
That is, in a normal state, as shown in FIG. 1, the movable contact 3 comes into contact with the fixed contact 2 due to the elasticity of the movable piece 30, and the electric circuit including both the contacts is closed and the current flows normally. .
On the other hand, an abnormal current flows between the contacts 2 and 3, or the temperature in the case 1 rises due to other causes, and the temperature in the case 1 is equal to or higher than the operating (reversal) temperature of the movable piece 30 that also serves as the thermally responsive element 4. , The movable piece 30 is inverted so as to warp upward in a concave spherical shape (dish shape) by a snap action. When the movable piece 30 performs the reverse operation in this way, the movable contact 3 is separated from the fixed contact 2 as shown in FIG. 6, the current between the contacts is interrupted, and a normal current does not flow in the electric circuit.
When the movable piece 30 is reversed, the movable piece 30 is brought into contact with the PTC element 7 at a predetermined pressure by reversal and presses the PTC element 7 against the fixed piece 20, and the fixed piece 20 and the movable piece 30 are connected to the fixed piece 20 through the PTC element 7. Is electrically connected. At this time, since a slight current flows in the electric circuit due to the electric resistance of the PTC element 7, the PTC element 7 generates heat at a constant temperature to prevent the movable piece 30 from returning, and the current between the contacts 2 and 3 continues to be cut off. Therefore, as long as there is no operation from the electronic device side, the return of the electric circuit to the normal state due to the temperature drop of the part is prevented, and the safety of the circuit is maintained.

前記実施形態のサーマルプロテクタは、固定片２０と接続しているＰＴＣ素子７が熱応動素子からなる可動片３０の反転中心部に近接して配設されており、熱応動素子からなる可動片３０の反転作動により両接点２，３が開いたとき、ＰＴＣ素子７に熱応動素子である可動片３０がその反転の圧力で接触するので、ＰＴＣ素子の熱が熱応動素子に確実に伝わり、より安定して作動する。   In the thermal protector of the above embodiment, the PTC element 7 connected to the fixed piece 20 is disposed in the vicinity of the inversion center portion of the movable piece 30 made of a thermally responsive element, and the movable piece 30 made of a thermally responsive element. When the contacts 2 and 3 are opened by the reversal operation, the movable piece 30 that is a thermally responsive element contacts the PTC element 7 with the reversal pressure, so that the heat of the PTC element is reliably transmitted to the thermally responsive element. Operates stably.

第２実施形態
図８は、本発明に係るサーマルプロテクタの第２実施形態（請求項２に対応）を示す部分断面図である。
この実施形態のサーマルプロテクタは、可動片３０をばね性を有する導電性の板で構成し、所定の作動温度での反転により可動接点３が固定接点２から離反するように前記可動片３０を作動させる熱応動素子４を別に設けたものである。
可動片３０の材質は、ステンレス合金が好ましいが、Ｃｕ−Ｂｅ合金、リン青銅，Ｃｕ−Ｔｉ合金，洋白，黄銅，Ｃｕ−Ｎｉ−Ｓｉ合金等の導電性を有するバネ材料を用いることができる。
熱応動素子４はＰＴＣ素子７の上面をカバーする状態に設置され、可動片３０の可動接点３の取付位置と固定側端部とのほぼ中間位置と、前記熱応動素子４の反転中心部とは近接し、ＰＴＣ素子７は前記熱応動素子４の反転中心部と近接して配設されている。したがってＰＴＣ素子７は、熱応動素子４の反転により所定の圧力でＰＴＣ素子７に接触する熱応動素子４を介して可動片３０と接続し、ＰＴＣ素子７の熱が熱応動素子４に確実に伝わるのでより安定して作動する。
図８の実施形態のサーマルプロテクタの他の構成や作用・効果は、図１〜図６の実施形態のサーマルプロテクタと同様であるので、それらの説明は省略する。 Second Embodiment FIG. 8 is a partial sectional view showing a second embodiment (corresponding to claim 2) of a thermal protector according to the present invention.
In the thermal protector of this embodiment, the movable piece 30 is composed of a conductive plate having a spring property, and the movable piece 30 is operated so that the movable contact 3 is separated from the fixed contact 2 by reversal at a predetermined operating temperature. The thermally responsive element 4 is provided separately.
The material of the movable piece 30 is preferably a stainless alloy, but a spring material having conductivity such as a Cu—Be alloy, phosphor bronze, Cu—Ti alloy, white, brass, Cu—Ni—Si alloy can be used. .
The thermally responsive element 4 is installed in a state of covering the upper surface of the PTC element 7, an approximately middle position between the mounting position of the movable contact 3 of the movable piece 30 and the fixed side end, and the inversion center portion of the thermally responsive element 4. Are adjacent to each other, and the PTC element 7 is disposed in the vicinity of the inversion center portion of the thermally responsive element 4. Therefore, the PTC element 7 is connected to the movable piece 30 via the thermal response element 4 that contacts the PTC element 7 at a predetermined pressure by reversal of the thermal response element 4, and the heat of the PTC element 7 is surely applied to the thermal response element 4. Because it is transmitted, it operates more stably.
Since the other structures, operations, and effects of the thermal protector of the embodiment of FIG. 8 are the same as those of the thermal protector of the embodiment of FIGS. 1 to 6, description thereof is omitted.

第３実施形態
図９は、本発明に係るサーマルプロテクタの第３実施形態（請求項４に対応）を示す部分断面図である。
この実施形態のサーマルプロテクタは、第２実施形態のサーマルプロテクタと同様に、可動片３０をばね性を有する導電性の板で構成し、所定の作動温度での反転により可動接点３が固定接点２から離反するように前記可動片３０を作動させる熱応動素子４を別に設けている。
この実施形態では、蓋体１１に第１の端子片５と外部端子板６を一体に取り付け、可動片３０の接合片３１と端子片５とを接続させている。第１実施形態のように、第２の端子片５０や第１の端子片５と第２の端子片５０とを接続する電気部品５ａは設けられていないほか、ケース１の幅は二次電池８の幅とほぼ適合しているが、その長さは二次電池８の長さより小さい。
可動片３０における可動接点３の取付位置と固定側端部（この実施形態では接合片３１の部分）とのほぼ中間に熱応動素子４の反転中心部が近接しており、ＰＴＣ素子７は熱応動素子４の反転中心部に近接して配設されている。可動片３０の固定側端部寄り位置には先端部方向に向けて先下がり傾斜状に弾性を有する舌片３４が形成されており、熱応動素子４は前記舌片３４によりＰＴＣ素子７に押し付けられている。
第３実施形態のサーマルプロテクタは、熱応動素子４が可動片３０に形成された弾性を有する舌片３４によりＰＴＣ素子７に押し付けられているので、ＰＴＣ素子７の位置が安定し、熱が熱応動素子４に一層伝わり易く、また、熱応動素子４の振動が防止される。固定片２０と可動片３０との間にはＰＴＣ素子７を通じて電流が流れるが、その電流は極小さいので電気回路中機器の通常の動作に必用な電流は供給されない。
第３実施形態のサーマルプロテクタの他の構成や作用効果は、第２実施形態のものとほぼ同様なのでそれらの説明は省略する。 Third Embodiment FIG. 9 is a partial sectional view showing a third embodiment (corresponding to claim 4) of the thermal protector according to the present invention.
In the thermal protector of this embodiment, like the thermal protector of the second embodiment, the movable piece 30 is composed of a conductive plate having a spring property, and the movable contact 3 is fixed to the fixed contact 2 by reversal at a predetermined operating temperature. A thermally responsive element 4 for operating the movable piece 30 is provided separately from the device.
In this embodiment, the first terminal piece 5 and the external terminal plate 6 are integrally attached to the lid body 11, and the joining piece 31 of the movable piece 30 and the terminal piece 5 are connected. As in the first embodiment, the second terminal piece 50 and the electrical component 5a for connecting the first terminal piece 5 and the second terminal piece 50 are not provided, and the width of the case 1 is a secondary battery. However, the length is smaller than the length of the secondary battery 8.
The inversion center portion of the thermally responsive element 4 is close to the middle of the mounting position of the movable contact 3 on the movable piece 30 and the fixed side end portion (the portion of the joining piece 31 in this embodiment), and the PTC element 7 is heated. The responding element 4 is disposed in the vicinity of the inversion center portion. A tongue piece 34 is formed in a position near the fixed side end of the movable piece 30 so as to be inclined downward toward the distal end, and the thermally responsive element 4 is pressed against the PTC element 7 by the tongue piece 34. It has been.
In the thermal protector of the third embodiment, since the thermally responsive element 4 is pressed against the PTC element 7 by the elastic tongue piece 34 formed on the movable piece 30, the position of the PTC element 7 is stabilized and the heat is heated. It is more easily transmitted to the responding element 4 and the vibration of the thermally responding element 4 is prevented. A current flows between the fixed piece 20 and the movable piece 30 through the PTC element 7, but since the current is extremely small, a current necessary for normal operation of the device in the electric circuit is not supplied.
The other configurations and operational effects of the thermal protector of the third embodiment are substantially the same as those of the second embodiment, so that the description thereof is omitted.

その他の実施形態
可動片３０が熱応動素子４を兼ねる第１実施形態のサーマルプロテクタ（図１）においては、第３実施形態である図９のサーマルプロテクタと同様に、可動片３０に図９の舌片３４と同様な舌片を形成し、この舌片でＰＴＣ素子７を固定片２０へ押し付けるように構成することができる。
このように構成すれば、ＰＴＣ素子７を舌片３４により押圧できるので、ＰＴＣ素子７の位置を安定させることができ、熱が熱応動素子を兼ねる可動片３０に一層伝わり易い。
このような構成は、請求項４に係る発明と対応する。 Other Embodiments In the thermal protector (FIG. 1) of the first embodiment in which the movable piece 30 also serves as the thermal actuator 4 (FIG. 1), the movable piece 30 has the same structure as that of the thermal protector of FIG. A tongue piece similar to the tongue piece 34 may be formed, and the PTC element 7 may be pressed against the fixed piece 20 with this tongue piece.
If comprised in this way, since the PTC element 7 can be pressed by the tongue piece 34, the position of the PTC element 7 can be stabilized, and heat is more easily transmitted to the movable piece 30 which also serves as a thermally responsive element.
Such a configuration corresponds to the invention according to claim 4.

前記実施形態では、サーマルプロテクタを携帯電話機の二次電池に取り付けた例を説明したが、本発明に係るサーマルプロテクタはその他の機器類の電気回路における保護装置として使用することができる。   In the embodiment, the example in which the thermal protector is attached to the secondary battery of the mobile phone has been described. However, the thermal protector according to the present invention can be used as a protection device in an electric circuit of other devices.

本発明の一実施形態に係るサーマルプロテクタを携帯電話機の二次電池（リチウムイオン電池）に取り付けた状態の部分断面図である。It is a fragmentary sectional view in the state where the thermal protector concerning one embodiment of the present invention was attached to the rechargeable battery (lithium ion battery) of a cellular phone. 本発明の一実施形態に係るサーマルプロテクタを携帯電話機の二次電池に取り付けた状態の部分斜視図である。It is a fragmentary perspective view of the state which attached the thermal protector which concerns on one Embodiment of this invention to the secondary battery of the mobile telephone. 図１のサーマルプロテクタの分解平面図である。FIG. 2 is an exploded plan view of the thermal protector of FIG. 1. ケースの蓋体の底面（裏面）図である。It is a bottom surface (back surface) figure of the cover body of a case. 図４の矢印Ａ−Ａに沿う部分拡大断面図である。It is a partial expanded sectional view which follows the arrow AA of FIG. 図１のサーマルプロテクタの接点が開いた状態の断面図である。It is sectional drawing of the state in which the contact of the thermal protector of FIG. 固定片の変形例を示す平面図である。It is a top view which shows the modification of a fixed piece. 本発明に係る第２実施形態のサーマルプロテクタの部分断面図である。It is a fragmentary sectional view of the thermal protector of 2nd Embodiment concerning this invention. 本発明に係る第３実施形態のサーマルプロテクタの部分断面図である。It is a fragmentary sectional view of the thermal protector of 3rd Embodiment concerning this invention.

符号の説明Explanation of symbols

１ ケース
１０ 本体
１０１ 受入穴
１０３ 位置決めピン
１１ 蓋体
１１３ 位置決め孔
１１４ 孔
２ 固定接点
２０ 固定片
２００ 突起状台座
２１ 端子部
２１０切欠部
２１１ スリット状の孔
３ 可動接点
３０可動片
３１ 接合片
３４ 舌片
４ 熱応動素子
５ 第１の端子片
５０ 第２の端子片
５ａ 電気部品
６ 外部端子板
７ ＰＴＣ素子
８ 二次電池
８０ 負極
８１ 正極 DESCRIPTION OF SYMBOLS 1 Case 10 Main body 101 Receiving hole 103 Positioning pin 11 Lid body 113 Positioning hole 114 Hole 2 Fixed contact 20 Fixed piece 200 Protrusion base 21 Terminal part 210 Notch part 211 Slit-shaped hole 3 Movable contact 30 Movable piece 31 Joining piece 34 Tongue Piece 4 Thermally responsive element 5 First terminal piece 50 Second terminal piece 5a Electrical component 6 External terminal plate 7 PTC element 8 Secondary battery 80 Negative electrode 81 Positive electrode

Claims (11)

固定接点（２）を有する固定片（２０）と、先端部に有する可動接点（３）をバネ作用により前記固定接点（２）へ接触させ、かつ所定の作動温度で反転して前記可動接点（３）を前記固定接点（２）から離反させる熱応動素子からなる可動片（３０）と、前記固定片（２０）に接続されたＰＴＣ素子（７）と、前記固定片（２０），固定接点（２），可動接点（３），可動片（３０）及びＰＴＣ素子（７）を収容し、かつ、本体（１０）と当該本体（１０）へ接合された蓋体（１１）とからなる絶縁性のケース（１）と、前記固定片（２０）と一体に連続し又は接続され前記ケース（１）の外部に現われた端子部（２１）と、前記可動片（３０）と接続され前記ケース（１）の外部に現われた端子片（５）と、を備え、前記可動片（３０）の反転中心部は可動接点（３）の取付位置と固定側端部とのほぼ中間に位置し、前記ＰＴＣ素子（７）は前記可動片（３０）の反転中心部と近接して配設されていることを特徴とするサーマルプロテクタ。 A fixed piece (20) having a fixed contact (2) and a movable contact (3) at the tip thereof are brought into contact with the fixed contact (2) by a spring action, and are inverted at a predetermined operating temperature so that the movable contact ( 3) a movable piece (30) made of a thermally responsive element that separates the fixed contact (2) from the fixed contact (2), a PTC element (7) connected to the fixed piece (20), the fixed piece (20), and a fixed contact (2) Insulation comprising a movable contact (3), a movable piece (30) and a PTC element (7) and comprising a main body (10) and a lid (11) joined to the main body (10) Case (1), a terminal portion (21) which is continuous or connected integrally with the fixed piece (20) and appears outside the case (1), and the case connected to the movable piece (30). A terminal piece (5) appearing outside of (1), the movable piece (30) The reversal center is located approximately in the middle between the mounting position of the movable contact (3) and the fixed side end, and the PTC element (7) is disposed close to the reversal center of the movable piece (30). A thermal protector characterized by 固定接点（２）を有する固定片（２０）と、先端部に有する可動接点（３）をバネ作用により前記固定接点（２）へ接触させる可動片（３０）と、所定の作動温度で反転して前記可動接点（３）が前記固定接点（２）から離反するように前記可動片（３０）を作動させる熱応動素子（４）と、前記固定片（２０）に接続されたＰＴＣ素子（７）と、前記固定片（２０），固定接点（２），可動接点（３），可動片（３０），熱応動素子（４）及びＰＴＣ素子（７）を収容し、かつ本体（１０）と当該本体（１０）へ接合された蓋体（１１）とからなる絶縁性のケース（１）と、前記固定片（２０）と一体に連続し又は接続され前記ケース（１）の外部に現われた端子部（２１）と、前記可動片（３０）と一体に連続し又は接続され前記ケース（１）の外部に現われた端子片（５）と、を備え、前記可動片（３０）の可動接点（３）の取付位置と固定側端部とのほぼ中間位置と、前記熱応動素子（４）の反転中心部とは近接し、前記ＰＴＣ素子（７）は前記熱応動素子（４）の反転中心部と近接して配設されていることを特徴とするサーマルプロテクタ。 A fixed piece (20) having a fixed contact (2), a movable piece (30) for bringing the movable contact (3) at the tip into contact with the fixed contact (2) by a spring action, and a predetermined operating temperature. And a PTC element (7) connected to the fixed piece (20) and a thermally responsive element (4) for operating the movable piece (30) so that the movable contact (3) is separated from the fixed contact (2). ), The fixed piece (20), the fixed contact (2), the movable contact (3), the movable piece (30), the thermally responsive element (4) and the PTC element (7), and the main body (10) An insulating case (1) composed of a lid (11) joined to the main body (10) and the fixed piece (20) is continuous or connected integrally and appears outside the case (1). The case which is connected to the terminal portion (21) and the movable piece (30) integrally or continuously. 1) a terminal piece (5) appearing on the outside of the movable piece (30), an intermediate position between the mounting position of the movable contact (3) and the fixed side end, and the thermally responsive element (4). ) In the vicinity of the inversion center, and the PTC element (7) is disposed in the vicinity of the inversion center of the thermally responsive element (4). 固定接点（２）と可動接点（３）とが閉じているときは両接点（２，３）を通じて固定片（２０）と可動片（３０）とが電気的に接続し、固定接点（２）と可動接点（３）とが開くとＰＴＣ素子（７）を通じて固定片（２０）と可動片（３０）とが電気的に接続するように、両接点（２，３）の開閉状態により電流経路が選択的に変更される、請求項１又は２に記載のサーマルプロテクタ。 When the fixed contact (2) and the movable contact (3) are closed, the fixed piece (20) and the movable piece (30) are electrically connected through the both contacts (2, 3), and the fixed contact (2). And the movable contact (3) open, the current path depends on the open / closed state of both contacts (2, 3) so that the fixed piece (20) and the movable piece (30) are electrically connected through the PTC element (7). The thermal protector according to claim 1 or 2, wherein is selectively changed. 前記ＰＴＣ素子（７）は可動片（３０）に形成された舌片により固定片（２０）に押し付けられている、請求項１に記載のサーマルプロテクタ。 The thermal protector according to claim 1, wherein the PTC element (7) is pressed against the fixed piece (20) by a tongue piece formed on the movable piece (30). 前記熱応動素子（４）は可動片（３０）に形成された舌片によりＰＴＣ素子（７）に押し付けられている、請求項２に記載のサーマルプロテクタ。 The thermal protector according to claim 2, wherein the thermally responsive element (4) is pressed against the PTC element (7) by a tongue formed on the movable piece (30). 前記固定片（２０）はケースの本体（１０）の底部へ埋め込み状に設けられ、前記本体（１０）の内底部には固定片（２０）の一面が現われるように受入穴（１０１）が形成され、前記ＰＴＣ素子（７）は一面側の電極が前記固定片（２０）の一面に接触する状態で前記受入穴（１０１）に収容されている、請求項１〜５のいずれかに記載のサーマルプロテクタ。 The fixed piece (20) is embedded in the bottom of the main body (10) of the case, and a receiving hole (101) is formed on the inner bottom of the main body (10) so that one surface of the fixed piece (20) appears. The said PTC element (7) is accommodated in the said receiving hole (101) in the state in which the electrode of one surface contacts the one surface of the said fixing piece (20), The claim 1 or 5 in any one of Claims 1-5. Thermal protector. 前記受入穴（１０１）の底部に現われる固定片（２０）の面にはＰＴＣ素子（７）を安定させるように少なくとも四個の突起状台座（２００）が形成され、前記ＰＴＣ素子（７）はその一面側の電極が前記各突起状台座（２００）に接触して収容されている、請求項６に記載のサーマルプロテクタ。 At least four protruding pedestals (200) are formed on the surface of the fixed piece (20) appearing at the bottom of the receiving hole (101) so as to stabilize the PTC element (7), and the PTC element (7) The thermal protector of Claim 6 with which the electrode of the one surface side is accommodated in contact with each said projecting base (200). 前記固定片（２０）の端子部（２１）は板状であって、平面視二股状に形成されるか又は長さ方向に沿ってスリット状の孔（２１１）が形成されている、請求項１〜７のいずれかに記載のサーマルプロテクタ。 The terminal portion (21) of the fixed piece (20) is plate-shaped and is formed in a bifurcated shape in plan view, or a slit-shaped hole (211) is formed along the length direction. The thermal protector in any one of 1-7. 前記サーマルプロテクタは二次電池（８）に取り付けられるものであり、当該サーマルプロテクタ又は前記ケース（１）の平面形状及び平面寸法が、前記二次電池（８）の取付面の平面形状及び平面寸法とほぼ一致しているか、前記二次電池（８）の取付面内に収まる寸法形状を有している、請求項１〜８のいずれかに記載のサーマルプロテクタ。 The thermal protector is attached to the secondary battery (8), and the planar shape and planar dimension of the thermal protector or the case (1) are the planar shape and planar dimension of the mounting surface of the secondary battery (8). The thermal protector according to any one of claims 1 to 8, wherein the thermal protector has a size and shape that substantially coincides with or fits within a mounting surface of the secondary battery (8). 前記サーマルプロテクタは二次電池（８）に取り付けられるものであり、当該サーマルプロテクタ又は前記ケース（１）の幅が前記二次電池（８）の取付面の厚みとほぼ適合している、請求項１〜８のいずれかに記載のサーマルプロテクタ。 The said thermal protector is attached to a secondary battery (8), The width | variety of the said thermal protector or the said case (1) is substantially adapted with the thickness of the attachment surface of the said secondary battery (8). The thermal protector in any one of 1-8. 携帯電話機その他の電子機器と二次電池（８）とが形成する電気回路中において、所定の作動温度以上に達したとき前記固定接点（２）と可動接点（３）とが開いて前記電子機器と二次電池（８）と固定接点（２）と可動接点（３）とを含んで形成される電気回路を遮断するように設けられ、前記固定接点（２）と可動接点（３）とが閉じているときは両接点（２，３）を通じて固定片（２０）と可動片（３０）とが電気的に接続し、固定接点（２）と可動接点（３）とが開くとＰＴＣ素子（７）を通じて固定片（２０）と可動片（３０）とが電気的に接続するように、両接点（２，３）の開閉状態により電流経路が変更される、請求項１〜１０のいずれかに記載のサーマルプロテクタ。 In the electric circuit formed by the mobile phone or other electronic device and the secondary battery (8), the fixed contact (2) and the movable contact (3) are opened when the temperature exceeds a predetermined operating temperature, and the electronic device And a secondary battery (8), a fixed contact (2) and a movable contact (3) are provided so as to cut off an electric circuit, and the fixed contact (2) and the movable contact (3) When closed, the fixed piece (20) and the movable piece (30) are electrically connected through the two contacts (2, 3), and when the fixed contact (2) and the movable contact (3) are opened, the PTC element ( The current path is changed according to the open / closed state of both contacts (2, 3) so that the fixed piece (20) and the movable piece (30) are electrically connected through 7). Thermal protector as described in 1.

Images