JP2009074946A - Temperature sensor - Google Patents

Temperature sensor Download PDF

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JP2009074946A
JP2009074946A JP2007244610A JP2007244610A JP2009074946A JP 2009074946 A JP2009074946 A JP 2009074946A JP 2007244610 A JP2007244610 A JP 2007244610A JP 2007244610 A JP2007244610 A JP 2007244610A JP 2009074946 A JP2009074946 A JP 2009074946A
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temperature sensor
metal plate
temperature
bottomed metal
present
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JP5201387B2 (en
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Yasuyuki Suzuki
康之 鈴木
Yuji Takahashi
勇二 高橋
Shigeo Endo
茂雄 遠藤
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Ishizuka Electronics Corp
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Ishizuka Electronics Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a temperature sensor with good temperature accuracy by improving the thermal responsiveness. <P>SOLUTION: The temperature sensor includes: a heat sensitive element composed of a heat sensitive part and a lead part; a bottomed metal plate in which the heat sensitive part is positioned by contacting it with the inside bottom part; and a molding that seals the bottomed metal plate and the heat sensitive element with the back side of the inside bottom part of the bottomed metal plate exposed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は被測定物の表面温度を検知する温度センサに関し、特にハイブリッド車に搭載する二次電池の表面温度を検知するための温度センサに関するものである。   The present invention relates to a temperature sensor that detects the surface temperature of an object to be measured, and more particularly to a temperature sensor that detects the surface temperature of a secondary battery mounted on a hybrid vehicle.

ハイブリッド車に搭載される二次電池には、ニッケル水素電池、リチウムイオン二次電池などがある。例えばニッケル水素電池は、正極に水酸化ニッケル、負極に水素吸蔵合金、電解液にアルカリ電解液とで構成されており、更に詳しくは、電解液中のOH−の移動を共用するセパレーターを介して組合された電極が複数組積層されて構成されたものである。電池ケースは、鉄やニッケルなどの金属材料で作られており、温度センサが、電池ケースの内部に作られた空間部に嵌合するように取り付けられている。ニッケル水素電池においては、充電完了間際に電圧が急上昇するため、電池内のセルが発熱するという現象が起こる。このため、電池内の各セルの温度を監視し、電池の異常発熱を防止するために温度センサが取り付けられている。   Secondary batteries installed in hybrid vehicles include nickel metal hydride batteries and lithium ion secondary batteries. For example, a nickel metal hydride battery is composed of nickel hydroxide for the positive electrode, a hydrogen storage alloy for the negative electrode, and an alkaline electrolyte for the electrolyte, and more specifically, via a separator that shares the movement of OH- in the electrolyte. A plurality of combined electrodes are laminated. The battery case is made of a metal material such as iron or nickel, and the temperature sensor is attached so as to fit into a space portion formed inside the battery case. In a nickel metal hydride battery, the voltage suddenly rises just before the completion of charging, so that a phenomenon occurs in which cells in the battery generate heat. For this reason, a temperature sensor is attached to monitor the temperature of each cell in the battery and prevent abnormal heat generation of the battery.

この温度センサは、図9に示すように、電池ケースBの内部に作られた凹陥部b1の形状に嵌合するように感熱素子51を樹脂で封止した成型体52によって構成されているものが広く知られている。この温度センサ50は、感熱素子51が封止された先端部が測温面(53)となっている。   As shown in FIG. 9, this temperature sensor is constituted by a molded body 52 in which a thermal element 51 is sealed with a resin so as to fit into the shape of a recessed portion b1 formed inside the battery case B. Is widely known. The temperature sensor 50 has a temperature measuring surface (53) at the tip end where the thermosensitive element 51 is sealed.

しかしながら、図9に示した温度センサ50は、測温面53で電池ケースBの熱を吸収するのであるが、測温面53で吸収した熱は、感熱素子51へ熱伝導し、同時に成型体52へも放熱される。したがって、感熱素子51へ十分に熱が伝わらず、充電検知回路では、まだ充電完了でないと誤って判断し、本来充電を停止しなければならないタイミングでも充電され続けてしまう恐れがあった。また、図9に示した温度センサ50は、成型金型で成型体を形成する際に感熱素子51が樹脂の注入圧力で移動してしまい、感熱素子51が成型体52の中で常に定まった位置に配置できず、感熱素子51と測温面53との距離ばらつきを生じ、温度センサの熱応答性のばらつきを生じる恐れがあった。また、図9に示した温度センサ50の測温面53には、ヒケ(凹痕)を生じることがあり、測温面53は、被測温面との接触面積が減少して、電池ケースからの時間当たりの熱エネルギーが減少し、温度センサ50の応答速度が遅くなる問題もあった。   However, although the temperature sensor 50 shown in FIG. 9 absorbs the heat of the battery case B by the temperature measuring surface 53, the heat absorbed by the temperature measuring surface 53 is thermally conducted to the thermal element 51 and at the same time a molded body. The heat is also released to 52. Therefore, heat is not sufficiently transmitted to the thermosensitive element 51, and the charge detection circuit erroneously determines that the charge is not yet completed, and there is a possibility that the charge will continue to be charged even when the charge must be stopped. Further, in the temperature sensor 50 shown in FIG. 9, when the molded body is formed with the molding die, the thermal element 51 is moved by the injection pressure of the resin, and the thermal element 51 is always determined in the molded body 52. It could not be arranged at the position, causing a variation in the distance between the thermosensitive element 51 and the temperature measuring surface 53, possibly causing a variation in the thermal response of the temperature sensor. In addition, sink marks (concave marks) may be formed on the temperature measuring surface 53 of the temperature sensor 50 shown in FIG. 9, and the temperature measuring surface 53 has a reduced contact area with the temperature measured surface. There is also a problem that the heat energy per hour from the time is decreased, and the response speed of the temperature sensor 50 becomes slow.

本発明は、上記課題に鑑みなされたものであり、熱応答性を改善し、温度精度の良好な温度センサを提供することを目的とする。   The present invention has been made in view of the above problems, and an object of the present invention is to provide a temperature sensor with improved thermal response and good temperature accuracy.

本発明は、上記課題を達成するためになされたものであり、請求項1の発明は、感熱部とリード部とで構成された感熱素子と、前記感熱部を内底部に接触させて位置決めさせる有底金属板と、前記有底金属板の内底部の反対面を露出させて前記有底金属板と前記感熱素子を封止する成型体とから構成されていることを特徴とする温度センサである。   The present invention has been made in order to achieve the above object, and the invention of claim 1 is directed to a thermal element composed of a thermal part and a lead part, and to position the thermal part in contact with an inner bottom part. A temperature sensor comprising: a bottomed metal plate; and a molded body that seals the bottomed metal plate and the thermosensitive element by exposing a surface opposite to the inner bottom portion of the bottomed metal plate. is there.

本発明の請求項2に係わる発明は、前記有底金属板が、コの字型、U字型、平鍋型、エンボス型の何れかで板金加工されていることを特徴とする請求項1に記載の温度センサである。   The invention according to claim 2 of the present invention is characterized in that the bottomed metal plate is sheet-metal processed in any one of a U-shape, a U-shape, a pan type, and an embossed shape. It is a temperature sensor of description.

本発明の請求項3に係わる発明は、前記有底金属板が、銅、リン青銅、銅合金、アルミニウム、ステンレスの何れかで出来ていることを特徴とする請求項1,2に記載の温度センサである。   The invention according to claim 3 of the present invention is characterized in that the bottomed metal plate is made of copper, phosphor bronze, copper alloy, aluminum, or stainless steel. It is a sensor.

本発明の請求項4に係わる発明は、前記有底金属板に、ニッケルめっきが形成されていることを特徴とする請求項1乃至3に記載の温度センサである。   The invention according to claim 4 of the present invention is the temperature sensor according to any one of claims 1 to 3, wherein the bottomed metal plate is formed with nickel plating.

本発明の温度センサは、有底金属板の内底部に感熱素子の感熱部が位置精度良く配置できるので、熱応答速度のばらつきの少ない温度検知が実現できる。   In the temperature sensor of the present invention, since the heat sensitive part of the heat sensitive element can be arranged with high positional accuracy on the inner bottom part of the bottomed metal plate, temperature detection with little variation in thermal response speed can be realized.

本発明の温度センサは、樹脂に覆われた感熱部を有する従来の温度センサよりも、熱伝導率の良い有底金属板の内底部に感熱部を接触させて配置させることにより熱応答性が良く被測温面の温度が急変しても応答速度が速く、温度精度の良い検知ができる。   The temperature sensor of the present invention is more thermally responsive by placing the heat sensitive part in contact with the inner bottom part of the bottomed metal plate having better thermal conductivity than the conventional temperature sensor having a heat sensitive part covered with resin. Even if the temperature of the surface to be measured changes rapidly, the response speed is fast and detection with good temperature accuracy is possible.

以下、本発明に係わる温度センサの一実施例を図1〜図8を参照して説明する。図1は、本発明に係わる温度センサSを表す図である。図1において、本発明の温度センサSは、感熱部1とリード部2とで構成された感熱素子12と、前記感熱部1を内底部に接触させて位置決めさせる有底金属板3と、前記有底金属板3の内底部の反対面を露出させて前記有底金属板3と前記感熱素子12を封止する成型体4と、感熱素子12を電気的に外部へ引き出す引出線5とから構成されている。   Hereinafter, an embodiment of a temperature sensor according to the present invention will be described with reference to FIGS. FIG. 1 is a diagram showing a temperature sensor S according to the present invention. In FIG. 1, a temperature sensor S of the present invention includes a thermosensitive element 12 composed of a thermosensitive portion 1 and a lead portion 2, a bottomed metal plate 3 for positioning the thermosensitive portion 1 in contact with an inner bottom portion, From the molded body 4 that seals the bottomed metal plate 3 and the thermal element 12 by exposing the opposite side of the inner bottom part of the bottomed metal plate 3, and the lead wire 5 that electrically pulls out the thermal element 12 to the outside. It is configured.

図2に示すように、感熱部1は、金属酸化物を主原料とし高温にて焼結して得られるサーミスタエレメント1aと、サーミスタエレメント1aに銀ペーストを焼成して焼き付けられた電極1bと、エポキシ系の絶縁材料からなるコーティング材1cとで構成されている。リード部2は、鉄ニッケル合金で、リード形状に加工されている。感熱素子12は、電極1bとリード部2の先端をはんだにより電気的に接続されている。更に、リード部2の他端には、はんだにより引出線5が接続されている。   As shown in FIG. 2, the thermosensitive part 1 includes a thermistor element 1 a obtained by sintering a metal oxide as a main raw material at a high temperature, an electrode 1 b baked by baking a silver paste on the thermistor element 1 a, And a coating material 1c made of an epoxy insulating material. The lead part 2 is an iron nickel alloy and is processed into a lead shape. In the thermal element 12, the electrode 1b and the tip of the lead portion 2 are electrically connected by solder. Furthermore, the lead wire 5 is connected to the other end of the lead portion 2 by solder.

有底金属板3は、図3に示すように、アルミニウム製で、内底部3aに感熱部1を配置できるようにコの字型に板金されている。内底部3aの反対面は、被測温体の面と接触させる測温面3bとなっている。成型体4は、図1に示すように、樹脂によって成型されており、電池ケースに形成された空間部に嵌合するように成型されている。本実施例では、円柱の形状に成型されている。   As shown in FIG. 3, the bottomed metal plate 3 is made of aluminum and is formed in a U shape so that the heat-sensitive portion 1 can be disposed on the inner bottom portion 3 a. The opposite surface of the inner bottom portion 3a is a temperature measuring surface 3b that is brought into contact with the surface of the temperature measured object. As shown in FIG. 1, the molded body 4 is molded from a resin and is molded so as to fit into a space formed in the battery case. In this embodiment, it is molded into a cylindrical shape.

なお、有底金属板3の表面にはニッケルなどのめっきをして腐食防止処理を行っても良い。更に、本発明に係わる一実施例では、コの字型の有底金属板3を開示したが、有底金属板3の形状は、U字型、平鍋型、エンボス型の形状でもよい。図4は、本発明に係わる他の実施例で、有底金属板3の形状がエンボス型の温度センサである。また、有底金属板の材質は、熱伝導性が良好な金属であれば良く、アルミニウム以外に銅やリン青銅や銅合金やステンレスであっても良いし、これに限定されるものではない。   The surface of the bottomed metal plate 3 may be subjected to corrosion prevention treatment by plating with nickel or the like. Furthermore, in one embodiment according to the present invention, the U-shaped bottomed metal plate 3 is disclosed. However, the shape of the bottomed metal plate 3 may be a U-shape, a pan type, or an embossed shape. FIG. 4 shows another embodiment of the present invention, in which the bottomed metal plate 3 is an embossed type temperature sensor. The material of the bottomed metal plate may be any metal having good thermal conductivity, and may be copper, phosphor bronze, copper alloy or stainless steel in addition to aluminum, and is not limited thereto.

次に、本発明に係わる温度センサSの製造方法を説明する。まず始めに、図3で示した感熱部1を有底金属板3の内底部3aに接触するように嵌め合うように挿入する。次に図5に示すように、感熱部1に有底金属板3を嵌合した感熱素子12及び引出線5を整形型101のキャビティ102内に配置する。次にキャビティ102内に液状合成樹脂材料を充填させて固化し、成型体4が形成され、整形型101から脱型して温度センサSが完成する。温度センサSは、有底金属板3の内底部3aの反対面が成型体4から露出した構造となり、この露出した測温面3bで、被測温面からの熱を効率良く吸収し、感熱部1へ熱伝導させる構造となっている。   Next, a method for manufacturing the temperature sensor S according to the present invention will be described. First, the heat-sensitive part 1 shown in FIG. 3 is inserted so as to fit in contact with the inner bottom part 3 a of the bottomed metal plate 3. Next, as shown in FIG. 5, the thermal element 12 and the lead wire 5 in which the bottomed metal plate 3 is fitted to the thermal part 1 are arranged in the cavity 102 of the shaping mold 101. Next, the cavity 102 is filled with a liquid synthetic resin material and solidified to form the molded body 4, which is removed from the shaping mold 101 to complete the temperature sensor S. The temperature sensor S has a structure in which the opposite surface of the inner bottom portion 3a of the bottomed metal plate 3 is exposed from the molded body 4, and the exposed temperature measuring surface 3b efficiently absorbs heat from the surface to be measured, The structure conducts heat to the part 1.

次に、本発明に係わる温度センサの取り付けの一例を説明する。図6は、本発明に係わる温度センサSを電池ケースの凹陥部へ挿入した断面図である。図6において、Bは被検知体である電池ケース、b1は電池ケースBに形成された凹陥部である。温度センサSは、凹陥部b1に挿入されている。温度センサの有底金属板3の測温面3bは、凹陥部b1の底面に面接触させる構造となっている。有底金属板3は、電池ケースBからの熱を測温面3bで効率よく吸収し、感熱部1へ熱応答よく熱伝導させている。   Next, an example of attachment of the temperature sensor according to the present invention will be described. FIG. 6 is a sectional view in which the temperature sensor S according to the present invention is inserted into the recessed portion of the battery case. In FIG. 6, B is a battery case that is a detection object, and b <b> 1 is a recess formed in the battery case B. The temperature sensor S is inserted into the recessed portion b1. The temperature measuring surface 3b of the bottomed metal plate 3 of the temperature sensor has a structure in surface contact with the bottom surface of the recessed portion b1. The bottomed metal plate 3 efficiently absorbs heat from the battery case B by the temperature measuring surface 3b and conducts heat to the heat sensitive part 1 with good thermal response.

次に、本発明における温度センサと従来の温度センサとの温度追従性を比較した。図7に示すように、120WのヒータHを内蔵した50mm×90mm、厚み20mmのアルミブロックABには、ヒータのコントロール用の熱電対HCとアルミブロックの表面温度を計測する熱電対ATとがテープによって表面に貼り付けられている。更に本発明の温度センサSと従来の温度センサ50とが、熱電対ATの近傍のアルミブロック表面に測温面を接触させて配置されている。図8は、ヒータを加熱させて、本発明の温度センサSと従来の温度センサ50とアルミブロックABの表面温度を計測した結果である。図8に示すとおり、アルミブロックABの表面温度Tabが上昇するに従い、本発明の温度センサSの検知温度Tsと従来の温度センサ50の検知温度T50とも上昇しているが、従来の温度センサ50よりも本発明の温度センサSの方が、アルミブロックABの表面温度をより正確に検知しているのがわかる。更に、アルミブロックABの表面温度変化に対しても熱応答性良く追従しているのがわかる。   Next, the temperature followability between the temperature sensor of the present invention and the conventional temperature sensor was compared. As shown in FIG. 7, a thermocouple HC for controlling the heater and a thermocouple AT for measuring the surface temperature of the aluminum block are taped on a 50 mm × 90 mm, 20 mm thick aluminum block AB having a 120 W heater H incorporated therein. Is stuck on the surface. Furthermore, the temperature sensor S of the present invention and the conventional temperature sensor 50 are arranged with the temperature measuring surface in contact with the aluminum block surface near the thermocouple AT. FIG. 8 shows the result of measuring the surface temperature of the temperature sensor S of the present invention, the conventional temperature sensor 50, and the aluminum block AB by heating the heater. As shown in FIG. 8, as the surface temperature Tab of the aluminum block AB increases, both the detection temperature Ts of the temperature sensor S of the present invention and the detection temperature T50 of the conventional temperature sensor 50 increase. It can be seen that the temperature sensor S of the present invention more accurately detects the surface temperature of the aluminum block AB. Further, it can be seen that the surface temperature change of the aluminum block AB also follows with good thermal response.

本発明の温度センサは、熱伝導率の良い有底金属板の内底部に感熱部を接触させて配置させることにより、被測温面からの熱を効率良く有底金属板が集熱し、感熱素子へ伝達することが出来るので熱応答性が良く被測温面の温度が急変しても熱応答性良く追従して正確に検知できるものである。   In the temperature sensor of the present invention, the bottomed metal plate efficiently collects the heat from the surface to be measured by arranging the heat sensitive part in contact with the inner bottom part of the bottomed metal plate having a good thermal conductivity. Since it can be transmitted to the element, the thermal response is good and even if the temperature of the surface to be measured changes suddenly, it can be accurately detected by following the thermal response.

本発明は、ハイブリッド車に搭載する二次電池の温度検知のほかに、各種産業機器、家電、OA機器の表面温度の検知を必要とする箇所に実装可能な温度センサである。   The present invention is a temperature sensor that can be mounted at a place where it is necessary to detect the surface temperature of various industrial devices, home appliances, and OA devices in addition to detecting the temperature of a secondary battery mounted on a hybrid vehicle.

図1は、本発明に係わる温度センサSの一実施例を説明する説明図である。FIG. 1 is an explanatory view for explaining an embodiment of a temperature sensor S according to the present invention. 図2は、本発明に係わる温度センサSの一実施例を説明する説明図である。FIG. 2 is an explanatory view for explaining an embodiment of the temperature sensor S according to the present invention. 図3は、本発明に係わる温度センサSの一実施例を説明する説明図である。FIG. 3 is an explanatory view for explaining an embodiment of the temperature sensor S according to the present invention. 図4は、本発明に係わる温度センサの他の実施例を説明する説明図である。FIG. 4 is an explanatory view for explaining another embodiment of the temperature sensor according to the present invention. 図5は、本発明に係わる温度センサSの製造方法を説明する説明図である。FIG. 5 is an explanatory view for explaining a method of manufacturing the temperature sensor S according to the present invention. 図6は、本発明に係わる温度センサSの取り付けを説明する説明図である。FIG. 6 is an explanatory view for explaining the attachment of the temperature sensor S according to the present invention. 図7は、本発明に係わる温度センサSと従来の温度センサ50との温度追従性を比較するために実施した試験方法を説明する説明図である。FIG. 7 is an explanatory diagram for explaining a test method carried out in order to compare the temperature followability between the temperature sensor S according to the present invention and the conventional temperature sensor 50. 図8は、本発明に係わる温度センサSと従来の温度センサ50との温度追従性を比較したグラフである。FIG. 8 is a graph comparing the temperature followability between the temperature sensor S according to the present invention and the conventional temperature sensor 50. 図9は、従来の温度センサの一実施例を説明する説明図である。FIG. 9 is an explanatory view for explaining an embodiment of a conventional temperature sensor.

符号の説明Explanation of symbols

S 温度センサ
1 感熱部
2 リード部
3 有底金属板
4 成型体
5 引出線
12 感熱素子
S Temperature sensor 1 Heat sensitive part 2 Lead part 3 Bottomed metal plate 4 Molded body 5 Leader 12 Thermal element

Claims (4)

感熱部とリード部とで構成された感熱素子と、前記感熱部を内底部に接触させて位置決めさせる有底金属板と、前記有底金属板の内底部の反対面を露出させて前記有底金属板と前記感熱素子を封止する成型体とから構成されていることを特徴とする温度センサ。   A thermosensitive element comprising a thermosensitive portion and a lead portion; a bottomed metal plate for positioning the thermosensitive portion in contact with an inner bottom portion; and exposing the opposite surface of the bottomed metal plate to the inner bottom portion; A temperature sensor comprising a metal plate and a molded body for sealing the thermosensitive element. 前記有底金属板が、コの字型、U字型、平鍋型、エンボス型の何れかで板金加工されていることを特徴とする請求項1に記載の温度センサ。   2. The temperature sensor according to claim 1, wherein the bottomed metal plate is sheet-metal processed in any one of a U-shape, a U-shape, a pan type, and an embossing type. 前記有底金属板が、銅、リン青銅、銅合金、アルミニウム、ステンレスの何れかで出来ていることを特徴とする請求項1,2に記載の温度センサ。   The temperature sensor according to claim 1 or 2, wherein the bottomed metal plate is made of copper, phosphor bronze, copper alloy, aluminum, or stainless steel. 前記有底金属板に、ニッケルめっきが形成されていることを特徴とする請求項1乃至3に記載の温度センサ。   The temperature sensor according to claim 1, wherein nickel plating is formed on the bottomed metal plate.
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JP2018004631A (en) * 2016-06-27 2018-01-11 エムウーアーエス フランス Temperature sensor having heat transfer element and method for forming temperature sensor
JP2018151349A (en) * 2017-03-15 2018-09-27 矢崎総業株式会社 Mounting structure of temperature sensor
JP2019002876A (en) * 2017-06-19 2019-01-10 矢崎総業株式会社 Temperature sensor
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017525979A (en) * 2014-08-21 2017-09-07 深▲セン▼市▲敏▼杰▲電▼子科技有限公司 Thermal radiation prevention NTC temperature sensor and its application
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JP2018004631A (en) * 2016-06-27 2018-01-11 エムウーアーエス フランス Temperature sensor having heat transfer element and method for forming temperature sensor
JP2018151349A (en) * 2017-03-15 2018-09-27 矢崎総業株式会社 Mounting structure of temperature sensor
JP2019002876A (en) * 2017-06-19 2019-01-10 矢崎総業株式会社 Temperature sensor
JP2021128010A (en) * 2020-02-12 2021-09-02 三菱マテリアル株式会社 Busbar module
JP7434984B2 (en) 2020-02-12 2024-02-21 三菱マテリアル株式会社 busbar module

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