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JP6335073B2 - Breaker and safety circuit and secondary battery pack provided therewith - Google Patents

Breaker and safety circuit and secondary battery pack provided therewith Download PDF

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JP6335073B2
JP6335073B2 JP2014180590A JP2014180590A JP6335073B2 JP 6335073 B2 JP6335073 B2 JP 6335073B2 JP 2014180590 A JP2014180590 A JP 2014180590A JP 2014180590 A JP2014180590 A JP 2014180590A JP 6335073 B2 JP6335073 B2 JP 6335073B2
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岡田 浩司
浩司 岡田
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Description

本発明は、電気機器の2次電池パック等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 pack or the like of an electric device.

例えば携帯電話、ノート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2次電池パックには、過充電や短絡などの異常が発生した場合、速やかに電流を遮断し過熱による危険を回避するためのブレーカーが用いられる。   For example, secondary battery packs such as small nickel-metal hydride batteries and lithium-ion batteries installed in mobile phones and laptop computers, etc., immediately shut off current when there is an abnormality such as overcharge or short circuit, and there is a danger due to overheating. A breaker is used to avoid this.

このようなブレーカーとして、下記の特許文献1に記載のものが知られている。前記ブレーカーは、固定接点を有する固定片と、先端部に形成された可動接点をバネ作用によって前記固定接点に接触させる可動片と、温度変化に伴う反転により前記可動接点を前記固定接点から離反させるバイメタルなどの熱応動素子とを含んで構成される。   As such a breaker, the one described in Patent Document 1 below is known. The breaker includes a fixed piece having a fixed contact, a movable piece that makes a movable contact formed at a tip of the fixed piece contact the fixed contact by a spring action, and the movable contact is separated from the fixed contact by reversal due to a temperature change. It is comprised including thermal responsive elements, such as a bimetal.

このうち固定片aは、図10(A)、(B)に示すように、インサート成形により樹脂製の第1ケースb内に埋設されている。しかしながら前記第1ケースbでは、インサート成形時、固定片aの接点部a1の近傍位置PにてウェルドラインWが形成されやすく、捻れなどに対する強度低下を招く傾向がある。   Among these, as shown in FIGS. 10A and 10B, the fixed piece a is embedded in the first case b made of resin by insert molding. However, in the first case b, during insert molding, the weld line W is likely to be formed at a position P near the contact portion a1 of the fixed piece a, and the strength tends to be reduced due to twisting.

詳しくは、前記固定片aは、固定接点を有する接点部a1と、この接点部a1に段曲げ部a2を介して連なるベース部a3とを具える。また前記第1ケースbには、浅底部c1と、この浅底部c1に段差部c2を介して連なる深底部c3とを有する開口cが設けられている。そして前記浅底部c1には、前記接点部a1を露出させる露出部分c1a、及びこの露出部分c1aと深底部c3との間を隔たらせる仕切り壁部c1bが形成される。   Specifically, the fixed piece a includes a contact portion a1 having a fixed contact, and a base portion a3 connected to the contact portion a1 via a step bent portion a2. The first case b is provided with an opening c having a shallow bottom portion c1 and a deep bottom portion c3 connected to the shallow bottom portion c1 via a stepped portion c2. The shallow portion c1 is formed with an exposed portion c1a that exposes the contact portion a1 and a partition wall portion c1b that separates the exposed portion c1a from the deep bottom portion c3.

このような第1ケースbでは、インサート成形時、矢印F1で示すように、深底部c3の周囲を回り込んで流れる樹脂が、前記仕切り壁部c1bの両端側から入り込む。しかしそのとき、樹脂が仕切り壁部c1bの中央側で行き止まり、停滞して冷えかけた状態で合流することで、ウェルドラインWが形成されることになる。特に、第1ケースbでは、表面側に前記開口cが配されるため、樹脂注入用のゲートは第1ケースbの裏面側に設けられる。そのため、ゲートから仕切り壁部c1bに至る樹脂流れの経路が長く樹脂の温度が低下し易くなるため、前記ウェルドラインWがより顕著に発生する。   In such a first case b, as shown by an arrow F1 during insert molding, the resin flowing around the deep bottom c3 enters from both ends of the partition wall c1b. However, at that time, the resin stops at the center of the partition wall portion c1b, and merges in a state where it stops and cools, so that the weld line W is formed. In particular, in the first case b, since the opening c is arranged on the front surface side, a resin injection gate is provided on the back surface side of the first case b. For this reason, the resin flow path from the gate to the partition wall c1b is long and the temperature of the resin is likely to decrease, so that the weld line W is more prominently generated.

なお仕切り壁部c1bは、インサート成形時、コア金型に形成される深底部形成用凸部が、前記固定片aの段曲げ部a2と衝合するのを避けるために必要である。   The partition wall portion c1b is necessary to prevent the deep bottom portion forming convex portion formed in the core mold from colliding with the stepped bent portion a2 of the fixed piece a during insert molding.

このような状況に鑑み本発明者が研究した結果、同図に矢印F2で示すように、もし深底部c3側と仕切り壁部c1b側との間で樹脂を流れやすくした場合には、仕切り壁部c1bの中央での樹脂の停滞がなくなり、ウェルドラインWの発生を抑制しうることを究明し得た。   As a result of research conducted by the present inventors in view of such a situation, as shown by an arrow F2 in the figure, if the resin flows easily between the deep bottom portion c3 side and the partition wall portion c1b side, the partition wall It has been found that the resin stagnation at the center of the part c1b is eliminated and the generation of the weld line W can be suppressed.

しかし従来においては、前記段差部c2は、接点部a1とは直角な壁面で形成されている。これに対して段曲げ部a2は、曲げ加工による強度低下を防ぐため、接点部a1及びベース部a3とは鈍角に曲げられている。そのため、段差部c2と段曲げ部a2との間に、間隔が局部的に減じるくびれ部分が形成されてしまい、深底部c3側と仕切り壁部c1b側との間の樹脂の流れが妨げられている。   However, conventionally, the stepped portion c2 is formed by a wall surface perpendicular to the contact portion a1. On the other hand, the step bending part a2 is bent at an obtuse angle with respect to the contact part a1 and the base part a3 in order to prevent a decrease in strength due to bending. For this reason, a constricted portion where the interval is locally reduced is formed between the stepped portion c2 and the stepped bent portion a2, and the flow of resin between the deep bottom portion c3 side and the partition wall portion c1b side is hindered. Yes.

特開2011−198645号公報JP 2011-198645 A

そこで本発明は、開口の段差部を、固定片の段曲げ部と同方向に傾く傾斜面とすることを基本として、深底部側と仕切り壁部側との間の樹脂流れを円滑化し、仕切り壁部でのウェルドラインの発生を抑えて耐久性を向上させうるブレーカー並びにそれを備えた安全回路及び2次電池パックを提供することを目的とする。   Therefore, the present invention is based on the fact that the stepped portion of the opening is an inclined surface that is inclined in the same direction as the stepped bent portion of the fixed piece, and smoothes the resin flow between the deep bottom side and the partition wall side, An object of the present invention is to provide a breaker capable of suppressing the occurrence of a weld line in a wall portion and improving durability, and a safety circuit and a secondary battery pack provided with the breaker.

上記目的を達成するために本発明は、固定接点を有する固定片と、先端部に可動接点を有し、前記可動接点を前記固定接点に押圧して接触させる可動片と、温度変化に伴って変形することにより前記可動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、前記固定片を埋設するとともに、前記可動片及び熱応動素子を収容するための開口を有する第1ケースと、前記開口を閉鎖するために前記第1ケースに固着される第2ケースとを備えたブレーカーにおいて、
前記開口は、浅底部と、この浅底部に段差部を介して連なりかつ前記熱応動素子を収容する深底部とを含み、前記固定片は、前記固定接点を有し前記浅底部の底面で表面が露出する接点部と、前記段差部よりも手前の位置で前記接点部から裏面側に傾斜して折れ曲がることにより前記第1ケース内に埋入する傾斜曲げ部と、この傾斜曲げ部から折れ曲がり前記深底部の底面下を通って長さ方向にのびるベース部とを含むとともに、前記段差部は、前記傾斜曲げ部と同方向に傾く傾斜面であることを特徴とする。
In order to achieve the above object, the present invention provides a fixed piece having a fixed contact, a movable piece at a tip, and a movable piece that presses and contacts the movable contact with the fixed contact. A thermal response element that operates the movable piece so that the movable contact is separated from the fixed contact by being deformed, and an opening that embeds the fixed piece and accommodates the movable piece and the thermal response element. In a breaker comprising a first case and a second case secured to the first case to close the opening,
The opening includes a shallow bottom portion and a deep bottom portion that is connected to the shallow bottom portion via a stepped portion and accommodates the thermally responsive element, and the fixed piece has the fixed contact and has a surface at a bottom surface of the shallow bottom portion. Is exposed from the stepped portion, an inclined bent portion embedded in the first case by being inclined and bent from the contact portion to the back side at a position before the stepped portion, and bent from the inclined bent portion. And a base portion extending in the length direction through the bottom surface of the deep bottom portion, and the step portion is an inclined surface inclined in the same direction as the inclined bent portion.

このブレーカーにおいて、前記傾斜面は、前記浅底部の底面の法線に対する角度θ1が30°以上であることが好ましい。   In this breaker, the inclined surface preferably has an angle θ1 of 30 ° or more with respect to a normal line of the bottom surface of the shallow bottom portion.

このブレーカーにおいて、前記傾斜面は、前記浅底部の底面の法線に対する角度θ1が、前記傾斜曲げ部の前記法線に対する角度θ2以上であることが好ましい。   In this breaker, it is preferable that the inclined surface has an angle θ1 with respect to a normal line of the bottom surface of the shallow bottom portion that is equal to or larger than an angle θ2 with respect to the normal line of the inclined bent portion.

このブレーカーにおいて、前記開口は、前記深底部の底面に、サーミスタを収容するサーミスタ収容凹部を具えるとともに、このサーミスタ収容凹部の底面で前記ベース部の表面が露出することが好ましい。   In this breaker, it is preferable that the opening has a thermistor receiving recess for receiving the thermistor on the bottom surface of the deep bottom portion, and the surface of the base portion is exposed at the bottom of the thermistor receiving recess.

このブレーカーにおいて、前記第1ケースは、その裏面かつ前記ベース部よりも長さ方向外側の位置にゲート跡を有することが好ましい。   In this breaker, it is preferable that the first case has a gate mark on a back surface thereof and a position on the outer side in the length direction from the base portion.

また、本発明の電気機器用の安全回路は、前記ブレーカーを備えたことを特徴とする。   In addition, a safety circuit for an electric device according to the present invention includes the breaker.

また、本発明の2次電池パックは、前記ブレーカーを備えたことを特徴とする。   In addition, a secondary battery pack according to the present invention includes the breaker.

本出願においては、第1ケースを下側、第2ケースを上側に配置したとき、上側を向く面を表(おもて)面、下側を向く面を裏(うら)面と定義するとともに、上側を表側、下側を裏側と定義する。   In this application, when the first case is disposed on the lower side and the second case is disposed on the upper side, the surface facing the upper side is defined as the front (front) surface, and the surface facing the lower side is defined as the back (back) surface. The upper side is defined as the front side and the lower side is defined as the back side.

本発明のブレーカーによれば、固定片を埋設した第1ケースは、浅底部と、この浅底部に段差部を介して連なる深底部とを含む開口が形成されている。従って、前記開口に可動片及び熱応動素子を収容したブレーカーを、従来の製造ラインを用いて容易に形成することができる。   According to the breaker of the present invention, the first case in which the fixed piece is embedded has an opening including a shallow bottom portion and a deep bottom portion connected to the shallow bottom portion via a step portion. Therefore, a breaker in which the movable piece and the thermally responsive element are accommodated in the opening can be easily formed using a conventional production line.

また前記固定片は、浅底部の底面で露出する接点部と、この段差部に傾斜曲げ部を介して連なるベース部とを有する。前記傾斜曲げ部は、段差部よりも手前の位置で接点部から裏面側に折れ曲がる。これにより浅底部には、接点部が露出する露出部分、及び露出部分と深底部との間を隔たらせる仕切り壁部が形成される。そのため、インサート成形時、コア金型の深底部形成用凸部と、傾斜曲げ部とが衝合して固定片が位置ずれするのを防止することができる。   The fixed piece has a contact portion exposed on the bottom surface of the shallow bottom portion and a base portion connected to the step portion via an inclined bending portion. The inclined bent portion is bent from the contact portion to the back side at a position before the stepped portion. As a result, an exposed portion where the contact portion is exposed and a partition wall portion that separates the exposed portion from the deep bottom portion are formed in the shallow bottom portion. Therefore, during insert molding, it is possible to prevent the fixed piece from being displaced due to a contact between the deep bottom forming convex portion of the core mold and the inclined bending portion.

しかも第1ケースでは、前記段差部を、前記傾斜曲げ部と同方向に傾く傾斜面としている。そのため、段差部と傾斜曲げ部と間に、間隔が局部的に減じるくびれ部分が形成されなくなり、深底部側と仕切り壁部側との間の樹脂の流れを円滑化しうる。その結果、仕切り壁部でのウェルドラインの発生を抑制することができる。具体的には、例えば、仕切り壁部の両端側から樹脂が入り込む場合、樹脂の流れを促進、迅速化させ、固化が始まる前に樹脂を合流させうる。或いは、深底部側からの樹脂が仕切り壁部側に先に流れ込み、仕切り壁部の各端側から入り込む樹脂と、固化が始まる前に合流させうる。或いは、深底部側からの樹脂により仕切り壁部を先に充填させてしまい、仕切り壁部の両端側からの樹脂の入り込みを抑制することなどにより、ウェルドラインの発生を抑制することができる。なお段差部自体の位置を変更して、段差部と傾斜曲げ部との間隔を広げた場合、ブレーカーの長さの増大を招き、小型化が強く要求されるブレーカーにとって製品価値に悪影響を与える。   Moreover, in the first case, the stepped portion is an inclined surface inclined in the same direction as the inclined bent portion. Therefore, a constricted portion where the interval is locally reduced is not formed between the stepped portion and the inclined bent portion, and the resin flow between the deep bottom portion side and the partition wall portion side can be smoothed. As a result, the generation of weld lines at the partition wall can be suppressed. Specifically, for example, when the resin enters from both ends of the partition wall portion, the flow of the resin can be promoted and speeded up, and the resin can be merged before solidification starts. Alternatively, the resin from the deep bottom side can first flow into the partition wall side and merge with the resin entering from each end side of the partition wall before solidification starts. Or generation | occurrence | production of a weld line can be suppressed by making the partition wall part fill with the resin from the deep bottom part side first, and suppressing entrance of the resin from the both ends of a partition wall part. If the position of the stepped portion itself is changed to widen the gap between the stepped portion and the inclined bent portion, the length of the breaker is increased, which adversely affects the product value for a breaker that is strongly required to be downsized.

本発明の一実施形態によるブレーカーの概略構成を示す組み立て斜視図。The assembly perspective view showing the schematic structure of the breaker by one embodiment of the present invention. 第1ケースに第2ケースを組み込む状態を示す斜視図。The perspective view which shows the state which incorporates a 2nd case in a 1st case. 通常の充電又は放電状態におけるブレーカーを示す断面図。Sectional drawing which shows 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を示す断面図。Sectional drawing which shows the breaker in the overcharge state or the time of abnormality. 固定片を埋設した第1ケースを示す斜視図。The perspective view which shows the 1st case which embedded the fixed piece. 段差部と傾斜曲げ部との関係を示す拡大断面図。The expanded sectional view which shows the relationship between a level | step-difference part and an inclination bending part. 段差部の他の実施例を示す拡大断面図。The expanded sectional view which shows the other Example of a level | step-difference part. (A)、(B)は、ゲート跡の一例を示す底面図。(A), (B) is a bottom view which shows an example of a gate trace. (A)はブレーカーを具えた2次電池パックの構成を示す平面図、(B)はブレーカーを具えた安全回路の回路図。(A) is a top view which shows the structure of the secondary battery pack provided with the breaker, (B) is a circuit diagram of the safety circuit provided with the breaker. (A)は従来の第1ケースを示す斜視図、(B)はその主要部を示す拡大断面図。(A) is a perspective view which shows the conventional 1st case, (B) is an expanded sectional view which shows the principal part.

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1〜3はブレーカー1の構成を示す。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3を有する可動片4と、温度変化に伴って変形する熱応動素子5と、ケース7とを含んで構成される。本例では、ブレーカー1が、PTC(Positive Temperature Coefficient)サーミスタ6をさらに有する場合が示される。   A breaker according to an embodiment of the present invention will be described with reference to the drawings. 1 to 3 show the configuration of the breaker 1. The breaker 1 includes a fixed piece 2 having a fixed contact 21, a movable piece 4 having a movable contact 3 at the tip, a thermally responsive element 5 that deforms with a temperature change, and a case 7. In this example, the case where the breaker 1 further has a PTC (Positive Temperature Coefficient) thermistor 6 is shown.

ケース7は、第1ケース71と、第2ケース72とからなり、第1ケース71の表(おもて)面には、可動片4、熱応動素子5及びPTCサーミスタ6を収納する開口73が形成される。また第2ケース71は、第1ケース71に固着され、前記開口73を閉鎖する。   The case 7 includes a first case 71 and a second case 72, and an opening 73 that accommodates the movable piece 4, the thermally responsive element 5, and the PTC thermistor 6 is formed on the front surface of the first case 71. Is formed. The second case 71 is fixed to the first case 71 and closes the opening 73.

第1ケース71は、少なくとも開口73が形成される部分において、樹脂によって形成される。樹脂としては、例えば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)などが好適に採用される。また第2ケース72としても、第1ケース71と同じ樹脂が好適に採用されるが、上述した樹脂と同等以上の特性が得られるのであれば、樹脂以外の材料を適用することができる。   The first case 71 is formed of resin at least in a portion where the opening 73 is formed. As the resin, for example, flame retardant polyamide, polyphenylene sulfide (PPS) excellent in heat resistance, liquid crystal polymer (LCP), polybutylene terephthalate (PBT) and the like are suitably employed. The second case 72 is also preferably made of the same resin as that of the first case 71. However, a material other than the resin can be used as long as the characteristics equal to or higher than those of the above-described resin can be obtained.

図5に示すように、第1ケース71の前記開口73は、固定片2の接点部2Aを露出させた浅底部73Aと、この浅底部73Aに段差部73Bを介して連なりかつ熱応動素子5を収容する深底部73Cとを含む。本例の開口73は、前記深底部73Cの底面Scに、PTCサーミスタ6を収容するサーミスタ収容凹部73Dをさらに具える。サーミスタ収容凹部73Dの周囲には、熱応動素子5の裏(うら)面を受ける環状のリブ74が、深底部73Cの底面Scから小高さで突出している。このリブ74は、が深底部73Cの底面Scから小高さで突出している。このリブ74の内周には、PTCサーミスタ6をサーミスタ収容凹部73D内に投入するときのガイドとなるテーパ面が形成される。   As shown in FIG. 5, the opening 73 of the first case 71 is connected to the shallow bottom portion 73A exposing the contact portion 2A of the fixed piece 2 and the shallow bottom portion 73A via a stepped portion 73B, and the thermal actuator 5 And a deep bottom portion 73C. The opening 73 of this example further includes a thermistor housing recess 73D for housing the PTC thermistor 6 on the bottom surface Sc of the deep bottom portion 73C. Around the thermistor housing recess 73D, an annular rib 74 that receives the back (back) surface of the thermally responsive element 5 protrudes from the bottom surface Sc of the deep bottom portion 73C at a small height. The rib 74 projects at a small height from the bottom surface Sc of the deep bottom portion 73C. On the inner periphery of the rib 74, a tapered surface is formed which serves as a guide when the PTC thermistor 6 is put into the thermistor housing recess 73D.

また第1ケース71には、前記固定片2がインサート成形によって埋め込まれている。この固定片2は、銅等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る。   Further, the fixed piece 2 is embedded in the first case 71 by insert molding. The fixed piece 2 is formed by pressing a metal plate mainly composed of copper or the like (other metal plate such as a copper-titanium alloy, white or brass).

図6に示すように、固定片2は、固定接点21を有する接点部2Aと、この接点部2Aから裏面側に傾斜して折れ曲がる傾斜曲げ部2Bと、この傾斜曲げ部2Bから折れ曲がり前記深底部73Cの底面下を通って長さ方向他方側にのびるベース部2Cとを含む。接点部2Aの長さ方向一方側には、前記第1ケース71の一方側端から外側に突出し、外部回路と電気的に接続される端子22が形成される。   As shown in FIG. 6, the fixed piece 2 includes a contact portion 2A having a fixed contact 21, an inclined bent portion 2B that bends and inclines from the contact portion 2A toward the back surface, and is bent from the inclined bent portion 2B. And a base portion 2C extending to the other side in the length direction through the bottom surface of 73C. A terminal 22 that protrudes outward from one end of the first case 71 and is electrically connected to an external circuit is formed on one side in the length direction of the contact portion 2A.

前記接点部2Aは、浅底部73Aの底面Saで露出し、この露出部分が固定接点21として形成される。固定接点21は、前記接点部2Aの表面を、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コーティングすることにより形成される。空間効率の観点から、前記固定接点21である接点部2Aの表面は、浅底部73Aの底面Saと面一をなすのが好ましい。   The contact portion 2A is exposed on the bottom surface Sa of the shallow bottom portion 73A, and this exposed portion is formed as the fixed contact 21. The fixed contact 21 is coated on the surface of the contact portion 2A by cladding, plating or coating of a conductive material such as copper, silver alloy, gold-silver alloy, as well as silver, nickel, nickel-silver alloy. Is formed. From the viewpoint of space efficiency, the surface of the contact portion 2A, which is the fixed contact 21, is preferably flush with the bottom surface Sa of the shallow bottom portion 73A.

前記傾斜曲げ部2Bは、段差部73Bよりも手前の位置、換言すれば、段差部73Bよりも長さ方向一方側の位置にて、接点部2Aから裏面側に折れ曲がり、第1ケース71内に埋入する。従って、浅底部73Aには、接点部2Aの露出部分と深底部73Cとの間を隔たらせる仕切り壁部75が形成される。傾斜曲げ部2Bは、接点部2A及びベース部2Cとは鈍角で折れ曲がり、これにより曲げ加工による強度低下が抑制される。なお浅底部73Aの底面Saの法線に対する傾斜曲げ部2Bの角度θ2は、特に規制されないが、従来と同様、樹脂の成形性などの観点から15〜30°程度が好適である。   The inclined bent portion 2B is bent from the contact portion 2A to the back surface side at a position in front of the stepped portion 73B, in other words, at a position on one side in the length direction from the stepped portion 73B. Embed. Therefore, a partition wall portion 75 that separates the exposed portion of the contact portion 2A and the deep bottom portion 73C is formed in the shallow bottom portion 73A. The inclined bent portion 2B is bent at an obtuse angle with respect to the contact portion 2A and the base portion 2C, thereby suppressing a decrease in strength due to bending. The angle θ2 of the inclined bending portion 2B with respect to the normal line of the bottom surface Sa of the shallow bottom portion 73A is not particularly limited, but is preferably about 15 to 30 ° from the viewpoint of resin moldability and the like as in the past.

本例のベース部2Cは、その一部が、前記サーミスタ収容凹部73Dの底面Sdで露出し、これにより露出部分がPTCサーミスタ6を載置する載置部23を形成する。なお載置部23には、PTCサーミスタ6を3点支持する小高さの凸状突起(図5に示す)23aが配されている。本例では載置部23の裏面が露出しているが、樹脂で覆われていてもよい。   A part of the base portion 2C of the present example is exposed at the bottom surface Sd of the thermistor housing recess 73D, whereby the exposed portion forms a mounting portion 23 on which the PTC thermistor 6 is mounted. The mounting portion 23 is provided with a convex protrusion 23a (shown in FIG. 5) having a small height for supporting the PTC thermistor 6 at three points. In this example, the back surface of the mounting portion 23 is exposed, but it may be covered with resin.

そして本発明では、前記開口73の段差部73Bは、前記固定片2の傾斜曲げ部2Bと同方向に傾く傾斜面76で形成される。これにより、段差部73Bと傾斜曲げ部2Bとの間に、間隔を十分に確保することが可能になり、インサート成形時、深底部73C側と仕切り壁部75側との間の樹脂の流れF2を円滑化することができる。その結果、例えば、仕切り壁部75の両端側から樹脂が入り込む場合、樹脂の流れを促進、迅速化させ、固化が始まる前に樹脂を合流させうる。或いは、深底部73側からの樹脂が仕切り壁部75側に先に流れ込み、仕切り壁部75の各端側から入り込む樹脂と、固化が始まる前に合流させうる。或いは、深底部73C側からの樹脂により仕切り壁部75を先に充填させてしまい、仕切り壁部75の両端側からの樹脂の入り込みを抑制することなどにより、ウェルドラインの発生を抑制することができる。   And in this invention, the level | step-difference part 73B of the said opening 73 is formed in the inclined surface 76 which inclines in the same direction as the inclination bending part 2B of the said fixed piece 2. As shown in FIG. Thereby, it becomes possible to ensure a sufficient space between the stepped portion 73B and the inclined bent portion 2B, and the resin flow F2 between the deep bottom portion 73C side and the partition wall portion 75 side during insert molding. Can be smoothed. As a result, for example, when the resin enters from both ends of the partition wall portion 75, the flow of the resin can be promoted and speeded up, and the resin can be joined before solidification starts. Alternatively, the resin from the deep bottom 73 side can flow into the partition wall 75 side first, and can merge with the resin entering from each end side of the partition wall 75 before solidification starts. Alternatively, it is possible to suppress the generation of the weld line by, for example, filling the partition wall portion 75 first with the resin from the deep bottom portion 73C side and suppressing the entry of the resin from both ends of the partition wall portion 75. it can.

特に、深底部73C側と仕切り壁部75側との間の樹脂の流れF2を円滑化するためには、傾斜面76(段差部73B)の、浅底部73Aの底面Saの法線に対する角度θ1を、30°以上とすることが好ましい。また同目的で、前記角度θ1を、傾斜曲げ部2Bの前記角度θ2以上とすることも好ましい。さらに好ましくは、前記角度θ1は、30°以上かつ角度θ2以上である。しかし角度θ1が過大で仕切り壁部75が薄くなると、成形性が悪化する上、微細な樹脂の破片が生じやすくなり好ましくない。前記破片は、可動接点41と固定接点21との間に入り込んで抵抗不良、導通不良の発生原因となりうる。このような観点から、角度θ1の上限は、70°以下、さらには60°以下が好ましい。   In particular, in order to smooth the resin flow F2 between the deep bottom portion 73C side and the partition wall portion 75 side, the angle θ1 of the inclined surface 76 (stepped portion 73B) with respect to the normal line of the bottom surface Sa of the shallow bottom portion 73A. Is preferably 30 ° or more. For the same purpose, it is also preferable that the angle θ1 is equal to or larger than the angle θ2 of the inclined bending portion 2B. More preferably, the angle θ1 is 30 ° or more and the angle θ2 or more. However, if the angle θ1 is excessively large and the partition wall portion 75 becomes thin, the moldability is deteriorated, and fine resin fragments are easily generated. The fragments can enter between the movable contact 41 and the fixed contact 21 and cause defective resistance and poor conduction. From such a viewpoint, the upper limit of the angle θ1 is preferably 70 ° or less, and more preferably 60 ° or less.

図7に示すように、深底部73C側と仕切り壁部75側との間の樹脂の流れを円滑化するためには、深底部73Cの底面Scを、傾斜面76(段差部73B)の下端に向かって下向きに傾斜させるのも好ましい。この場合、熱応動素子5の湾曲の概形に沿って底面Scを形成して深底部73Cの樹脂厚が大きくなるので、ケース7全体の剛性、強度が高められるという利点も生まれる。   As shown in FIG. 7, in order to smooth the flow of the resin between the deep bottom portion 73C side and the partition wall portion 75 side, the bottom surface Sc of the deep bottom portion 73C is set to the lower end of the inclined surface 76 (stepped portion 73B). It is also preferable to tilt downward. In this case, since the bottom surface Sc is formed along the outline of the curvature of the thermally responsive element 5 and the resin thickness of the deep bottom portion 73C is increased, there is an advantage that the rigidity and strength of the entire case 7 can be increased.

図8(A)に示すように、第1ケース71の裏面71Sかつ前記ベース部2Cよりも長さ方向外側の位置に、ゲート跡80が設けられる。ゲート跡80は、ゲート内で硬化した樹脂の切断痕であり、本例では、裏面71Sに凹部81を設け、この凹部81の底面にゲート跡80を設けている。これにより、ゲート跡80が裏面71Sから突出するのを防止しうる。なお図8(B)に示すように、ベース部2Cに、ベース部2Cを凹部81から離間させるための切欠き部82を形成することもできる。かかる場合には、凹部81及びゲートの形成位置の自由度を高めることができる。このような位置にゲートを設けた場合、ゲートから深底部73Cをへて仕切り壁部75に至る樹脂の流れF2がより円滑化されるため、ウェルドラインの抑制効果をより高めることが可能となる。   As shown in FIG. 8A, a gate mark 80 is provided at a position on the back surface 71S of the first case 71 and on the outer side in the length direction from the base portion 2C. The gate trace 80 is a cut trace of the resin hardened in the gate. In this example, a recess 81 is provided on the back surface 71S, and the gate trace 80 is provided on the bottom surface of the recess 81. Thereby, the gate trace 80 can be prevented from protruding from the back surface 71S. As shown in FIG. 8B, a notch 82 for separating the base 2C from the recess 81 can be formed in the base 2C. In such a case, the degree of freedom of the formation positions of the recess 81 and the gate can be increased. When the gate is provided at such a position, the flow F2 of the resin from the gate to the partition wall 75 through the deep bottom 73C is smoothed, so that the weld line suppression effect can be further enhanced. .

図1、2に示すように、可動片4は、板状の金属材料をプレス加工することにより、例えば巾中心線に対して対称なアーム状に形成される。可動片4の材料としては、固定片2と同等の銅等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を用いてもよい。   As shown in FIGS. 1 and 2, the movable piece 4 is formed into an arm shape symmetrical with respect to the width center line, for example, by pressing a plate-shaped metal material. As a material of the movable piece 4, a material mainly composed of copper or the like equivalent to the fixed piece 2 is preferable. In addition, a conductive elastic material such as copper-titanium alloy, white or brass may be used.

可動片4の長さ方向他方側端には、ケース7の他方側端から外側に突出し、外部回路と電気的に接続される端子41が形成される。また可動片4の長さ方向一方側端かつ裏面には、可動接点3が形成される。可動接点3は、固定接点21と同等の材料によって形成され、溶接の他、クラッド、かしめ(crimping)等の手法によって可動片4の先端部に接合される。可動片4は、可動接点3と端子41の間に、挟持部42と弾性部43とを有する。挟持部42は、第1、第2ケース71、72間に挟まれて、ケース7に固定される。本例の挟持部42は、巾方向両側に張り出す翼状部42aを有し、これにより巾広となり、固定がより強固かつ安定して行われる。   A terminal 41 that protrudes outward from the other end of the case 7 and is electrically connected to an external circuit is formed at the other end in the length direction of the movable piece 4. A movable contact 3 is formed at one end in the length direction of the movable piece 4 and on the back surface. The movable contact 3 is formed of the same material as that of the fixed contact 21 and is joined to the tip of the movable piece 4 by a technique such as clad or crimping in addition to welding. The movable piece 4 has a sandwiching part 42 and an elastic part 43 between the movable contact 3 and the terminal 41. The sandwiching portion 42 is sandwiched between the first and second cases 71 and 72 and fixed to the case 7. The clamping part 42 of this example has the wing | blade-like part 42a projected on the both sides of the width direction, and becomes wide by this, and fixation is performed more firmly and stably.

弾性部43は、挟持部42と可動接点3との間に配され、その弾性変形により、可動接点3を固定接点21に押圧させて互いに通電させる。なお弾性部43の裏面には、熱応動素子5と接触する一対の突起43aが設けられ、これにより熱応動素子5の変形が弾性部43に伝達される。なお第1ケース71の表面には、前記挟持部42が填り込んで位置決めされる勘合凹部78が形成される。また勘合凹部78には、挟持部42に設ける位置決め孔42bに勘合することにより位置決め精度を高める位置決めピン78aが突出する。   The elastic part 43 is disposed between the sandwiching part 42 and the movable contact 3, and by the elastic deformation, the movable contact 3 is pressed against the fixed contact 21 to energize each other. Note that a pair of protrusions 43 a that come into contact with the heat responsive element 5 are provided on the back surface of the elastic portion 43, whereby the deformation of the heat responsive element 5 is transmitted to the elastic portion 43. A fitting recess 78 is formed on the surface of the first case 71 so that the clamping portion 42 is inserted and positioned. In addition, a positioning pin 78a that enhances positioning accuracy by fitting into a positioning hole 42b provided in the clamping portion 42 protrudes from the fitting recess 78.

熱応動素子5は、バイメタル、トリメタルなどの複合材料からなり、凸円弧状に湾曲した初期形状を有する。過熱により動作温度に達すると、前記湾曲形状はスナップモーションを伴って逆反りし、冷却により復帰温度を下回ると復元する。熱応動素子5の初期形状は、プレス加工により形成することができる。熱応動素子5の材質及び形状は特に限定されるものでないが、生産性及び逆反り動作の効率性の観点から矩形が望ましく、小型でありながら弾性部43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、熱応動素子5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、ステンレス鋼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 thermoresponsive element 5 is made of a composite material such as bimetal or trimetal, and has an initial shape curved in a convex arc shape. When the operating temperature is reached due to overheating, the curved shape reversely warps with snap motion, and recovers when the temperature falls below the return temperature due to cooling. The initial shape of the thermoresponsive element 5 can be formed by pressing. Although the material and shape of the thermal responsive element 5 are not particularly limited, a rectangular shape is desirable from the viewpoint of productivity and efficiency of reverse warping operation, and it is close to a square in order to efficiently push up the elastic portion 43 while being small. A rectangular shape is desirable. Examples of the material of the thermally responsive element 5 include, for example, white, brass, and stainless steel including copper-nickel-manganese alloy or nickel-chromium-iron alloy on the high expansion side and iron-nickel alloy on the low expansion side. A laminate of two types of materials having different coefficients of thermal expansion made of various alloys such as steel is used in combination according to the required conditions.

熱応動素子5の逆反り動作により固定片2と可動片4との通電が遮断されたとき、PTCサーミスタ6に流れる電流が増大する。PTCサーミスタ6は、温度上昇と共に抵抗値が増大して電流を制限する正特性サーミスタであれば、動作電流、動作電圧、動作温度、復帰温度などの要求に応じて種類を選択でき、その材料及び形状はこれらの諸特性を損なわない限り特に限定されるものではない。本実施形態では、チタン酸バリウム、チタン酸ストロンチウム又はチタン酸カルシウムを含むセラミック焼結体が用いられる。セラミック焼結体の他、ポリマーにカーボン等の導電性粒子を含有させたいわゆるポリマーPTCを用いてもよい。   When the energization of the fixed piece 2 and the movable piece 4 is interrupted by the reverse warping operation of the thermal response element 5, the current flowing through the PTC thermistor 6 increases. As long as the PTC thermistor 6 is a positive temperature coefficient thermistor whose resistance value increases with temperature rise and limits the current, the type can be selected according to requirements such as operating current, operating voltage, operating temperature, return temperature, etc. The shape is not particularly limited as long as these properties are not impaired. In the present embodiment, a ceramic sintered body containing barium titanate, strontium titanate or calcium titanate is used. In addition to the ceramic sintered body, a so-called polymer PTC in which conductive particles such as carbon are contained in a polymer may be used.

第2ケース72は、前記開口73を塞ぐために前記第1ケース71の表(おもて)面に、例えば超音波溶着の適宜の接着手段によって固着される。本例の第2ケース72には、補強片(図示しない)がインサート成形によって埋め込まれている。補強片は、上述した銅を主成分とする金属板、ステンレス等の金属板などをプレス加工することにより形成される。補強片は、可動片4の上面と適宜当接し、可動片4の動きを規制すると共に、ケース7全体の剛性、強度を高める。なお第2ケース72としては、開口73を塞ぐものであればよく、例えば、第2ケース72に、可動片4の挟持部42に相当する部分をインサート成形などにより埋め込み、これにより第2ケース72に可動片4を取り付けることもできる。また可動片4を、挟持部42に相当する部分で端子41側の第1部と弾性部43側の第2部とに分割し、第1部を第2ケース72にインサート成形などにより埋設し、ブレーカー組み立て時、第2部を第1部に接合させるなど、第2ケース72に各種機能を設置することができる。   The second case 72 is fixed to the front surface of the first case 71 in order to close the opening 73 by, for example, an appropriate bonding means such as ultrasonic welding. In the second case 72 of this example, a reinforcing piece (not shown) is embedded by insert molding. The reinforcing piece is formed by pressing the above-described metal plate mainly composed of copper, a metal plate such as stainless steel, or the like. The reinforcing piece abuts on the upper surface of the movable piece 4 as appropriate, restricts the movement of the movable piece 4, and increases the rigidity and strength of the entire case 7. The second case 72 only needs to close the opening 73. For example, a portion corresponding to the sandwiching portion 42 of the movable piece 4 is embedded in the second case 72 by insert molding or the like. The movable piece 4 can also be attached to. Further, the movable piece 4 is divided into a first part on the terminal 41 side and a second part on the elastic part 43 side at a portion corresponding to the clamping part 42, and the first part is embedded in the second case 72 by insert molding or the like. Various functions can be installed in the second case 72, such as joining the second part to the first part during breaker assembly.

次に、ブレーカー1の動作を説明する。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、熱応動素子5は初期形状を維持し、固定接点21と可動接点3とが接触することで、ブレーカー1の両端子22、41間は導通している。このとき、可動片4の弾性部43と、熱応動素子5とは接触し、従って、可動片4、熱応動素子5、PTCサーミスタ6及び固定片2は、回路として導通している。しかしPTCサーミスタ6の抵抗は、可動片4の抵抗に比べて圧倒的に大きいため、PTCサーミスタ6を流れる電流は、固定接点21及び可動接点3を流れる量に比して実質的に無視できる程度である。   Next, the operation of the breaker 1 will be described. FIG. 3 shows the operation of the breaker 1 in a normal charge or discharge state. In a normal charge or discharge state, the thermally responsive element 5 maintains the initial shape, and the terminals 22 and 41 of the breaker 1 are electrically connected by the fixed contact 21 and the movable contact 3 coming into contact with each other. At this time, the elastic portion 43 of the movable piece 4 and the thermal response element 5 are in contact with each other. Therefore, the movable piece 4, the thermal response element 5, the PTC thermistor 6 and the fixed piece 2 are electrically connected as a circuit. However, since the resistance of the PTC thermistor 6 is overwhelmingly larger than the resistance of the movable piece 4, the current flowing through the PTC thermistor 6 is substantially negligible compared to the amount flowing through the fixed contact 21 and the movable contact 3. It is.

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、動作温度に達した熱応動素子5は逆反りし、可動片4の弾性部43が押し上げられて固定接点21と可動接点3とが離反する。このとき、固定接点21と可動接点3の間を流れていた電流は遮断され、僅かな漏れ電流が熱応動素子5及びPTCサーミスタ6を通して流れることとなる。PTCサーミスタ6は、このような漏れ電流の流れる限り発熱を続け、熱応動素子5を逆反り状態に維持させつつ抵抗値を激増させる。そのため、電流は固定接点21と可動接点3の間の経路を流れず、上述の僅かな漏れ電流のみが存在する(自己保持回路を構成する)。この漏れ電流は安全装置の他の機能に充てることができる。   FIG. 4 shows the operation of the breaker 1 in an overcharged state or an abnormality. When a high temperature state occurs due to overcharging or abnormality, the thermally responsive element 5 that has reached the operating temperature is reversely warped, the elastic portion 43 of the movable piece 4 is pushed up, and the fixed contact 21 and the movable contact 3 are separated. At this time, the current flowing between the fixed contact 21 and the movable contact 3 is cut off, and a slight leakage current flows through the thermal actuator 5 and the PTC thermistor 6. The PTC thermistor 6 continues to generate heat as long as such a leakage current flows, and drastically increases the resistance value while maintaining the thermally responsive element 5 in a reverse warped state. For this reason, the current does not flow through the path between the fixed contact 21 and the movable contact 3, and only the above-described slight leakage current exists (configures a self-holding circuit). This leakage current can be used for other functions of the safety device.

過充電状態を解除する、又は異常状態が解消されると、PTCサーミスタ6の発熱も収まり、熱応動素子5は復帰温度に戻り、元の初期形状に復元する。そして、可動片4の弾性部43の弾性力によって可動接点3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 heat generation of the PTC thermistor 6 is also stopped, and the thermal actuator 5 returns to the return temperature and restores the original initial shape. Then, the movable contact 3 and the fixed contact 21 come into contact again by the elastic force of the elastic portion 43 of the movable piece 4, the circuit is released from the interruption state, and returns to the conduction state shown in FIG. 3.

本発明のブレーカー1は、2次電池パック、電気機器用の安全回路等にも広く適用できる。図9(A)は2次電池パック100を示す。2次電池パック100は、2次電池101と、2次電池101の出力端回路中に設けたブレーカー1とを具える。図9(B)は電気機器用の安全回路102を示す。安全回路102は、2次電池101の出力回路中に直列にブレーカー1を具える。   The breaker 1 of the present invention can be widely applied to secondary battery packs, safety circuits for electrical devices, and the like. FIG. 9A shows the secondary battery pack 100. The secondary battery pack 100 includes a secondary battery 101 and a breaker 1 provided in an output terminal circuit of the secondary battery 101. FIG. 9B shows a safety circuit 102 for electrical equipment. The safety circuit 102 includes the breaker 1 in series in the output circuit of the secondary battery 101.

以上、本発明の特に好ましい実施形態について詳述したが、本発明は図示の実施形態に限定されることなく、種々の態様に変形して実施しうる。   As mentioned above, although especially preferable embodiment of this invention was explained in full detail, this invention is not limited to embodiment of illustration, It can deform | transform and implement in a various aspect.

1 ブレーカー
2 固定片
2A 接点部
2B 傾斜曲げ部
2C ベース部
3 可動接点
4 可動片
5 熱応動素子
21 固定接点
71 第1ケース
72 第2ケース
73 開口
73A 浅底部
73B 段差部
73C 深底部
73D サーミスタ収容凹部
76 傾斜面
80 ゲート跡
100 2次電池パック
102 安全回路
DESCRIPTION OF SYMBOLS 1 Breaker 2 Fixed piece 2A Contact part 2B Inclined bending part 2C Base part 3 Movable contact 4 Movable piece 5 Thermally responsive element 21 Fixed contact 71 1st case 72 2nd case 73 Opening 73A Shallow bottom part 73B Step part 73C Deep bottom part 73D Thermistor accommodation Recess 76 Inclined surface 80 Gate mark 100 Secondary battery pack 102 Safety circuit

Claims (7)

固定接点を有する固定片と、
先端部に可動接点を有し、前記可動接点を前記固定接点に押圧して接触させる可動片と、
温度変化に伴って変形することにより前記可動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、
前記固定片を埋設するとともに、前記可動片及び熱応動素子を収容するための開口を有する第1ケースと、
前記開口を閉鎖するために前記第1ケースに固着される第2ケースとを備えたブレーカーにおいて、
前記開口は、浅底部と、この浅底部に段差部を介して連なりかつ前記熱応動素子を収容する深底部とを含み、
前記固定片は、前記固定接点を有し前記浅底部の底面で表面が露出する接点部と、前記段差部よりも手前の位置で前記接点部から裏面側に傾斜して折れ曲がることにより前記第1ケース内に埋入する傾斜曲げ部と、この傾斜曲げ部から折れ曲がり前記深底部の底面下を通って長さ方向にのびるベース部とを含むとともに、
前記段差部は、前記傾斜曲げ部と同方向に傾く傾斜面である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 at a tip, and pressing the movable contact against the fixed contact; and
A thermally responsive element that operates the movable piece so that the movable contact is separated from the fixed contact by being deformed with a temperature change;
A first case having an opening for embedding the fixed piece and accommodating the movable piece and the thermally responsive element;
In a breaker comprising a second case fixed to the first case to close the opening,
The opening includes a shallow bottom portion, and a deep bottom portion that is connected to the shallow bottom portion via a step portion and accommodates the thermoresponsive element,
The fixed piece has the fixed contact and has a contact portion whose surface is exposed on the bottom surface of the shallow bottom portion, and is bent at an angle from the contact portion to the back side at a position before the stepped portion. An inclined bending portion embedded in the case, and a base portion that is bent from the inclined bending portion and extends in the length direction through the bottom of the deep bottom portion, and
The stepped portion is an inclined surface inclined in the same direction as the inclined bent portion.
前記傾斜面は、前記浅底部の底面の法線に対する角度θ1が30°以上であることを特徴とする請求項1記載のブレーカー。   2. The breaker according to claim 1, wherein the inclined surface has an angle θ <b> 1 with respect to a normal line of the bottom surface of the shallow bottom portion of 30 ° or more. 前記傾斜面は、前記浅底部の底面の法線に対する角度θ1が、前記傾斜曲げ部の前記法線に対する角度θ2以上であることを特徴とする請求項1又は請求項2記載のブレーカー。   The breaker according to claim 1 or 2, wherein an angle θ1 of the inclined surface with respect to a normal line of the bottom surface of the shallow bottom portion is equal to or larger than an angle θ2 with respect to the normal line of the inclined bent portion. 前記開口は、前記深底部の底面に、サーミスタを収容するサーミスタ収容凹部を具えるとともに、このサーミスタ収容凹部の底面で前記ベース部の表面が露出することを特徴とする請求項1乃至請求項3の何れか一項に記載のブレーカー。   The opening has a thermistor-receiving recess for receiving the thermistor on the bottom surface of the deep bottom portion, and the surface of the base portion is exposed at the bottom of the thermistor-receiving recess. Breaker as described in any one of. 前記第1ケースは、その裏面かつ前記ベース部よりも長さ方向外側の位置にゲート跡を有することを特徴とする請求項1乃至請求項4の何れか一項に記載のブレーカー。   The breaker according to any one of claims 1 to 4, wherein the first case has a gate mark at a position on the back surface thereof and on the outer side in the length direction of the base portion. 請求項1乃至請求項5の何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電気機器用の安全回路。   A safety circuit for an electric device comprising the breaker according to any one of claims 1 to 5. 請求項1乃至請求項5の何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2次電池パック。   A secondary battery pack comprising the breaker according to any one of claims 1 to 5.
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