JP2006032184A - Battery state detection unit - Google Patents

Battery state detection unit Download PDF

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JP2006032184A
JP2006032184A JP2004211014A JP2004211014A JP2006032184A JP 2006032184 A JP2006032184 A JP 2006032184A JP 2004211014 A JP2004211014 A JP 2004211014A JP 2004211014 A JP2004211014 A JP 2004211014A JP 2006032184 A JP2006032184 A JP 2006032184A
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battery
detection unit
terminal
state detection
temperature sensor
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JP4494895B2 (en
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Yuichi Watanabe
勇一 渡辺
Hisashi Otsuki
久志 大槻
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Furukawa Electric Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery state detection unit capable of detecting a further correct state of a battery by correctly detecting a terminal-to-terminal voltage, a discharge current and a temperature of the battery. <P>SOLUTION: This battery state detection unit is provided with: a discharge circuit for applying a discharge current between terminals of the battery 10; a voltage detection part for detecting the terminal-to-terminal voltage of the battery; a current detection part for detecting the discharge current; a temperature sensor 50 for detecting the temperature of the battery; a calculation part for calculating internal impedance of the battery corrected according to the temperature of the battery; and a casing 16 for housing them. The casing 16 is so structured as to be mounted to the battery 10. The temperature sensor 50 is attached to the casing 16 so as to contact a terminal 22B of the battery when the casing 16 is mounted to the battery 10. Specifically, the casing 16 is provided with a projecting part 52 having a tip in contact with the terminal 22B of the battery; and the temperature sensor 50 is installed in the projecting part 52 and sealed with a resin 54. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、バッテリ（蓄電池）の劣化状態や残留容量などを検知するバッテリ状態検知ユニットに関するものである。   The present invention relates to a battery state detection unit that detects a deterioration state or a residual capacity of a battery (storage battery).

バッテリの劣化状態を検知する手段としては、バッテリの端子間に放電電流を流して、そのときの端子間電圧及び放電電流を検出し、検出した電圧及び電流の値からバッテリの内部インピーダンスを算出し、得られた内部インピーダンスの値からバッテリの状態を判定する方法が一般的である。この場合、バッテリの内部インピーダンスはバッテリの温度の影響を受けるため、バッテリの温度を検出して内部インピーダンスを補正するようにしている（特許文献１、２参照）。   As a means of detecting the deterioration state of the battery, a discharge current is passed between the terminals of the battery, the voltage between the terminals and the discharge current at that time are detected, and the internal impedance of the battery is calculated from the detected voltage and current values. A general method is to determine the state of the battery from the obtained value of the internal impedance. In this case, since the internal impedance of the battery is affected by the temperature of the battery, the internal impedance is corrected by detecting the temperature of the battery (see Patent Documents 1 and 2).

従来のこの種のバッテリ状態検知ユニットは、バッテリから離れた場所に設置されていた。またバッテリの温度検出は温度センサをバッテリのケース側面に貼り付けること等により行われていた。   The conventional battery state detection unit of this type has been installed at a location away from the battery. The temperature of the battery is detected by attaching a temperature sensor to the side surface of the battery case.

特開２００１−７６７６２号公報JP 2001-76762 A 特開２００１−２２８２２６号公報JP 2001-228226 A

バッテリの内部インピーダンスは非常に小さく、新品で数ｍΩ程度、ある程度劣化しても数十〜数百ｍΩ程度しかなく、高い測定精度が要求される。しかしバッテリ状態検知ユニットがバッテリから離れた場所に設置されていると、検知ユニットとバッテリ間をつなぐ導体が長くなって、導体抵抗や外部の影響を受けやすくなるため、測定精度を高めることが困難である。また温度センサをバッテリのケース側面に貼り付けて温度を検出する方式では、バッテリの周囲の温度変化の影響を受けやすく、バッテリの温度を正確に測定することが困難である。   The internal impedance of the battery is very small, about several mΩ for a new product, and only about several tens to several hundreds mΩ even if it deteriorates to some extent, and high measurement accuracy is required. However, if the battery status detection unit is installed at a location away from the battery, the conductor connecting the detection unit and the battery becomes longer, making it more susceptible to conductor resistance and external influences, making it difficult to improve measurement accuracy. It is. Further, the method of detecting the temperature by attaching the temperature sensor to the side surface of the battery case is easily affected by the temperature change around the battery, and it is difficult to accurately measure the temperature of the battery.

本発明の目的は、バッテリの端子間電圧、放電電流、温度をより正確に検出できるバッテリ状態検知ユニットを提供することにある。   The objective of this invention is providing the battery state detection unit which can detect the voltage between terminals of a battery, a discharge current, and temperature more correctly.

本発明は、バッテリの端子間に内部インピーダンス測定用の放電電流を流す放電回路と、前記放電電流を流したときのバッテリの端子間電圧を検出する電圧検出部と、前記放電電流を検出する電流検出部と、バッテリの温度を検出する温度センサと、検出された電圧、電流及び温度の値からバッテリの温度に応じて補正されたバッテリの内部インピーダンスを算出する演算部と、これらを収容する筐体とを備えたバッテリ状態検知ユニットにおいて、
前記筐体はバッテリに組み付けられるように構成されており、
前記温度センサは、前記筐体をバッテリに組み付けたときに、バッテリの端子又はケースに直接又は他の部材を介して間接的に接触するように前記筐体に取り付けられていることを特徴とするものである。 The present invention provides a discharge circuit for passing a discharge current for measuring internal impedance between terminals of a battery, a voltage detector for detecting a voltage between terminals of the battery when the discharge current is passed, and a current for detecting the discharge current A detection unit; a temperature sensor that detects the temperature of the battery; a calculation unit that calculates the internal impedance of the battery corrected according to the battery temperature from the detected voltage, current, and temperature values; and a housing that houses them. In a battery state detection unit comprising a body,
The housing is configured to be assembled to a battery;
The temperature sensor is attached to the casing so as to be in direct contact with a terminal or case of the battery directly or through another member when the casing is assembled to the battery. Is.

本発明に係るバッテリ状態検知ユニットは、筐体に、先端がバッテリの端子に接触する凸部が設けられ、温度センサがこの凸部の中に設置されている構成とすることが好ましい。   It is preferable that the battery state detection unit according to the present invention has a configuration in which a convex portion whose tip is in contact with the battery terminal is provided on the casing, and a temperature sensor is installed in the convex portion.

また、前記凸部の中に設置された温度センサは、凸部内に充填された樹脂で封止されていることが好ましい。   Moreover, it is preferable that the temperature sensor installed in the said convex part is sealed with the resin with which the convex part was filled.

また、前記凸部はゴムで形成され、凸部の先端がゴムの弾性反発力でバッテリの端子に押し付けられるようになっていることが好ましい。   Moreover, it is preferable that the said convex part is formed with rubber | gum, and the front-end | tip of a convex part is pressed on the terminal of a battery with the elastic repulsive force of rubber | gum.

また、前記凸部は断熱性の壁で囲まれていることが好ましい。   Moreover, it is preferable that the said convex part is enclosed by the heat insulating wall.

また、本発明に係るバッテリ状態検知ユニットは、筐体の、バッテリのケースと対向する面に凹部が設けられており、温度センサはこの凹部内にバッテリのケースに直接又は他の部材を介して間接的に接触するように設置されている構成とすることもできる。   In the battery state detection unit according to the present invention, a recess is provided in a surface of the housing facing the battery case, and the temperature sensor is directly in the battery case in the recess or via another member. It can also be set as the structure installed so that it may contact indirectly.

また、前記凹部内に設置された温度センサは、凹部に充填された樹脂で封止されていることが好ましい。   Moreover, it is preferable that the temperature sensor installed in the said recessed part is sealed with resin with which the recessed part was filled.

また、筐体の内部には、前記凹部を囲むように断熱性の壁が設けられていることが好ましい。   Moreover, it is preferable that a heat insulating wall is provided inside the housing so as to surround the concave portion.

また、本発明に係るバッテリ状態検知ユニットは、放電回路のプラス側接続端子部がバスバーによりバッテリのプラス端子に、放電回路のマイナス側接続端子部がバスバーによりバッテリのマイナス端子に接続されるようになっていることが好ましい。   In the battery state detection unit according to the present invention, the positive connection terminal portion of the discharge circuit is connected to the positive terminal of the battery by the bus bar, and the negative connection terminal portion of the discharge circuit is connected to the negative terminal of the battery by the bus bar. It is preferable that

本発明に係るバッテリ状態検知ユニットは、その筐体がバッテリに組み付けられるように構成されているので、検知ユニットとバッテリ間をつなぐ導体の長さを十分短くでき、放電電流を流したときの電圧降下の影響を少なくして、バッテリの端子間電圧及び放電電流をより正確に検出することができる。また前記筐体をバッテリに組み付けたときに、温度センサがバッテリの端子又はケースに直接又は他の部材を介して間接的に接触するようになっているので、バッテリの温度をより正確に検出することができる。したがってバッテリの内部インピーダンス測定とその温度補正をより正確に行うことができ、バッテリの状態をより正確に検知することができる。   Since the battery state detection unit according to the present invention is configured so that the housing is assembled to the battery, the length of the conductor connecting the detection unit and the battery can be sufficiently shortened, and the voltage when the discharge current flows. It is possible to detect the voltage between terminals of the battery and the discharge current more accurately by reducing the influence of the drop. Further, when the casing is assembled to the battery, the temperature sensor is configured to contact the battery terminal or case directly or indirectly through another member, so that the temperature of the battery can be detected more accurately. be able to. Therefore, the internal impedance measurement of the battery and its temperature correction can be performed more accurately, and the state of the battery can be detected more accurately.

〔実施形態１〕 図１〜図３は本発明の一実施形態を示す。図において、１０は自動車等に搭載されたバッテリ、１２は本発明に係るバッテリ状態検知ユニットである。この検知ユニット１２は、プリント回路基板１４を収納した筐体１６を備えている。筐体１６の両側面にはブラケット１８が突設されており、検知ユニット１２は、このブラケット１８をバッテリ１０側のブラケット２０にボルトナット等により固定することにより、バッテリ１０に組み付けられるようになっている。なお、バッテリ側ブラケット２０がバッテリ１０に直接設けることができない場合には、バッテリ１０をケース等に収納し、そのケースにブラケットを設け、図１に示すような取付状態となるようにしてもよい。 Embodiment 1 FIGS. 1 to 3 show an embodiment of the present invention. In the figure, 10 is a battery mounted on an automobile or the like, and 12 is a battery state detection unit according to the present invention. The detection unit 12 includes a housing 16 that houses a printed circuit board 14. Brackets 18 project from both side surfaces of the casing 16, and the detection unit 12 can be assembled to the battery 10 by fixing the bracket 18 to the bracket 20 on the battery 10 side with bolts and nuts. ing. In addition, when the battery side bracket 20 cannot be directly provided in the battery 10, the battery 10 may be accommodated in a case or the like, and a bracket may be provided in the case so as to be in an attached state as shown in FIG. .

また筐体１６の上部からはバッテリ１０のプラス端子２２Ａとマイナス端子２２Ｂに向けて一対のバスバー２４Ａ、２４Ｂが突出している。バスバー２４Ａ、２４Ｂの内端は筐体１６内で、図３に示すように回路基板１４の接続端子部２６Ａ、２６Ｂに接続されている。接続端子部２６Ａ、２６Ｂは厚肉の金属板などからなり、回路基板１４に予め半田付け等により固定されている。バスバー２４Ａ、２４Ｂの外端は、図１に示すように筐体１６をバッテリ１０に組み付けた状態で、ボルトナット２８により端子２２Ａ、２２Ｂの頂部に締め付け接続されている。なお端子２２Ａ、２２Ｂは、この実施形態の場合、図２に示すようにΠ形に折り曲げられた厚肉の金属板で構成されている。また端子２２Ａ、２２Ｂには、発電機や負荷につながる導体も接続されているが図示を省略してある。   A pair of bus bars 24A and 24B protrude from the upper portion of the housing 16 toward the plus terminal 22A and the minus terminal 22B of the battery 10. The inner ends of the bus bars 24A and 24B are connected to the connection terminal portions 26A and 26B of the circuit board 14 as shown in FIG. The connection terminal portions 26A and 26B are made of a thick metal plate or the like, and are fixed to the circuit board 14 by soldering or the like in advance. As shown in FIG. 1, the outer ends of the bus bars 24 </ b> A and 24 </ b> B are clamped and connected to the tops of the terminals 22 </ b> A and 22 </ b> B by bolts and nuts 28 with the housing 16 assembled to the battery 10. In the case of this embodiment, the terminals 22A and 22B are formed of thick metal plates bent in a bowl shape as shown in FIG. The terminals 22A and 22B are also connected to a generator and a conductor connected to a load, but are not shown.

回路基板１４には各種電子部品３０が実装され、図３に示すような内部インピーダンス測定回路が構成されている。図３において、３２はトランジスタ等のスイッチング素子３４とシャント抵抗Ｒ1、Ｒ2で構成される放電回路、３６はスイッチング素子３４を所定の周波数でオンオフする放電制御部、３８はバッテリのプラス端子２２Ａの電圧（端子間電圧）を検出する電圧検出部、４０は放電回路３２の電流を検出する電流検出部である。４２は、電圧検出部３８で検出した電圧と電流検出部４０で検出した電流とをそれぞれオペアンプ４４、４６を介して入力して、バッテリ１０の内部インピーダンスを計算する演算部である。放電制御部３６及び演算部４２はＣＰＵ４８の機能の一部として構成されている。 Various electronic components 30 are mounted on the circuit board 14 to form an internal impedance measuring circuit as shown in FIG. In FIG. 3, 32 is a discharge circuit comprising a switching element 34 such as a transistor and shunt resistors R 1 and R 2 , 36 is a discharge control unit for turning on and off the switching element 34 at a predetermined frequency, and 38 is a positive terminal 22A of the battery. The voltage detector 40 detects the voltage (voltage between terminals), and 40 is a current detector that detects the current of the discharge circuit 32. Reference numeral 42 denotes an arithmetic unit that calculates the internal impedance of the battery 10 by inputting the voltage detected by the voltage detection unit 38 and the current detected by the current detection unit 40 through operational amplifiers 44 and 46, respectively. The discharge control unit 36 and the calculation unit 42 are configured as part of the function of the CPU 48.

このバッテリ状態検知ユニット１２はバッテリ１０に組み付けられるように構成されているため、バスバー２４Ａ、２４Ｂの長さを十分短く（100mm以下に）できる。バッテリの内部インピーダンスを正確に測定するためには、バッテリの端子２２Ａ、２２Ｂから回路基板の接続端子部２６Ａ、２６Ｂまでの抵抗値（接触抵抗を含む）を２ｍΩ以下にすることが好ましい。厚さ２mm、幅25mm程度の銅製のバスバーを使用すれば、上記の抵抗値を２ｍΩ以下にすることが可能である。   Since the battery state detection unit 12 is configured to be assembled to the battery 10, the length of the bus bars 24A and 24B can be made sufficiently short (less than 100 mm). In order to accurately measure the internal impedance of the battery, the resistance value (including the contact resistance) from the battery terminals 22A and 22B to the connection terminal portions 26A and 26B of the circuit board is preferably 2 mΩ or less. If a copper bus bar having a thickness of about 2 mm and a width of about 25 mm is used, the above resistance value can be reduced to 2 mΩ or less.

放電回路３２は回路基板１４の接続端子部２６Ａ、２６Ｂ間に最短に配置される。これにより回路基板１４上の配線抵抗を極力減少させる。好ましくは接続端子部２６Ａ、２６Ｂ間の間隔を200mm以下とする。   The discharge circuit 32 is arranged in the shortest distance between the connection terminal portions 26A and 26B of the circuit board 14. Thereby, the wiring resistance on the circuit board 14 is reduced as much as possible. Preferably, the interval between the connection terminal portions 26A and 26B is set to 200 mm or less.

放電回路３２、電圧測定回路（電圧検出部３８及びオペアンプ４４を含む）、電流測定回路（電流検出部４０及びオペアンプ４６を含む）、ＣＰＵ４８、その他の周辺回路の電源とグランドは、前記接続端子部２６Ａ、２６Ｂの一点で接続する。これは次の理由による。内部インピーダンス測定時には放電回路３２に大きな電流を流す。例えば10Ａ流したとすると、導体抵抗が２ｍΩの場合、20ｍＶの電圧降下が発生してしまう。もし、放電回路３２の電流が流れる経路に電圧検出部３８が接続されていたとすると、電圧測定回路はこの電圧降下の影響を受けてしまい、バッテリ１０の応答電圧を正確に測定することができなくなる。マイナス側も同じで、もし、放電回路３２の電流が流れる経路にＣＰＵ４８や電圧測定回路のグランド側が接続されていたとすると、上記の電圧降下の影響を受けてしまい、バッテリ１０の応答電圧を正確に測定することができなくなる。上記のように一点で接続することで、内部インピーダンス測定時の放電電流による電圧降下の影響を排除できる。   The power supply and ground of the discharge circuit 32, the voltage measurement circuit (including the voltage detection unit 38 and the operational amplifier 44), the current measurement circuit (including the current detection unit 40 and the operational amplifier 46), the CPU 48, and other peripheral circuits are connected to the connection terminal unit. 26A and 26B are connected at one point. This is due to the following reason. When measuring the internal impedance, a large current is passed through the discharge circuit 32. For example, if a current of 10 A is applied, a voltage drop of 20 mV occurs when the conductor resistance is 2 mΩ. If the voltage detection unit 38 is connected to the path through which the current of the discharge circuit 32 flows, the voltage measurement circuit is affected by this voltage drop and cannot accurately measure the response voltage of the battery 10. . The negative side is the same, and if the ground side of the CPU 48 or the voltage measurement circuit is connected to the path through which the current of the discharge circuit 32 flows, it is affected by the voltage drop described above, and the response voltage of the battery 10 is accurately set. It becomes impossible to measure. By connecting at one point as described above, it is possible to eliminate the influence of the voltage drop due to the discharge current when measuring internal impedance.

ところで、バッテリの内部インピーダンスはバッテリの温度によっても大きく影響されるので、上記のようにして測定した内部インピーダンスは温度による補正が必要である。バッテリの温度を精度よく測定するには、バッテリの内部に温度センサを入れることが望ましい。しかしこの方法は、コストや製造方法を考えると現実的ではない。そこで、この実施形態では、バッテリ１０の端子２２Ｂに温度センサ５０を接触させて端子２２Ｂの温度を測定するようにした。バッテリの端子はバッテリ内部の極板と熱伝導性の良好な導体でつながっているため、端子の温度はバッテリの内部の温度と正確に対応している。したがってバッテリの端子の温度を測定すれば、バッテリ内部の温度を精度よく測定することができる。図４に一例を示す。この例で示すとおり、バッテリ内部の温度とバッテリの端子（マイナス端子）の温度は精度よく一致している。なお、状態検知ユニット内部の温度は、内部の半導体素子などの発熱の影響があるため、環境温度より高い値を示している。   Incidentally, since the internal impedance of the battery is greatly influenced by the temperature of the battery, the internal impedance measured as described above needs to be corrected by the temperature. In order to accurately measure the temperature of the battery, it is desirable to put a temperature sensor inside the battery. However, this method is not practical considering the cost and manufacturing method. Therefore, in this embodiment, the temperature sensor 50 is brought into contact with the terminal 22B of the battery 10 to measure the temperature of the terminal 22B. Since the terminal of the battery is connected to the electrode plate inside the battery with a conductor having good thermal conductivity, the temperature of the terminal accurately corresponds to the temperature inside the battery. Therefore, if the temperature of the battery terminal is measured, the temperature inside the battery can be accurately measured. An example is shown in FIG. As shown in this example, the temperature inside the battery and the temperature of the battery terminal (minus terminal) coincide with each other with high accuracy. Note that the temperature inside the state detection unit is higher than the environmental temperature because of the influence of heat generation from the internal semiconductor elements.

バッテリの端子２２Ｂの温度を測定するため、筐体１６の端子２２Ｂと対向する位置には凸部５２が形成され、この中に温度センサ５０が設置されている。凸部５２は筒状で、筐体１６をバッテリ１０に組み付けたときに、先端が端子２２Ｂに接触するように形成されている。温度センサ５０は、端子２２Ｂに直接接触させてもよいが、図２に示すように、凸部５２内に熱伝導性のよい樹脂５４を充填して、温度センサ５０を樹脂５４で封止し、樹脂５４を介して端子２２Ｂに間接的に接触させてもよい。樹脂５４で封止した方が温度センサ５０の保護が確実であり、伝熱面積も大きくとれる。熱伝導性のよい樹脂５４としては例えばエポキシ樹脂を使用することができる。また温度センサ５０としては、チップ内に温度センサやオペアンプが集積されたＣＭＯＳ温度センサＩＣ（セイコーインスツルメンツ株式会社のS-8110C/8120Cシリーズ等）を使用することができる。また凸部５２の周壁は肉厚を厚くして断熱性をもたせ、温度センサ５０が外界の温度変化の影響を受けないようにすることが好ましい。   In order to measure the temperature of the battery terminal 22B, a convex portion 52 is formed at a position facing the terminal 22B of the housing 16, and the temperature sensor 50 is installed therein. The convex portion 52 has a cylindrical shape and is formed so that the tip contacts the terminal 22B when the housing 16 is assembled to the battery 10. The temperature sensor 50 may be in direct contact with the terminal 22B. However, as shown in FIG. 2, the convex portion 52 is filled with a resin 54 having good thermal conductivity, and the temperature sensor 50 is sealed with the resin 54. Alternatively, the terminal 22B may be indirectly contacted through the resin 54. Sealing with the resin 54 ensures the protection of the temperature sensor 50 and increases the heat transfer area. As the resin 54 with good thermal conductivity, for example, an epoxy resin can be used. As the temperature sensor 50, a CMOS temperature sensor IC (such as S-8110C / 8120C series manufactured by Seiko Instruments Inc.) in which a temperature sensor and an operational amplifier are integrated in a chip can be used. Moreover, it is preferable that the peripheral wall of the convex part 52 is made thick to provide heat insulation so that the temperature sensor 50 is not affected by the temperature change of the outside world.

温度センサ５０で検出されたバッテリの温度は演算部４２に入力され、算出された内部インピーダンスの温度補正の処理が行われる。この実施形態では、バッテリの温度を高精度で検出できるので、バッテリの内部インピーダンスの正確な温度補正を行うことができる。温度補正後のバッテリの内部インピーダンス（バッテリの状態）は図示しない表示部に表示される。   The temperature of the battery detected by the temperature sensor 50 is input to the calculation unit 42, and a temperature correction process for the calculated internal impedance is performed. In this embodiment, since the temperature of the battery can be detected with high accuracy, accurate temperature correction of the internal impedance of the battery can be performed. The internal impedance (battery state) of the battery after temperature correction is displayed on a display unit (not shown).

〔実施形態２〕 図５は本発明の他の実施形態を示す。このバッテリ状態検知ユニット１２は、筐体１６の端子２２Ｂと対向する位置に凸部５２を設けて、凸部５２内に温度センサ５０を設置する点では実施形態１と同様であるが、凸部５２が、バッテリの端子２２Ｂに押し付ける方向に伸縮性のあるゴムで形成されている点が実施形態１と異なる。筐体１６をバッテリ１０に組み付ける前の凸部５２の筐体１６表面からの突出寸法Ｐ（図５（Ａ）参照）は、筐体１６をバッテリ１０に組み付けた後の筐体１６と端子２２Ｂの間隔Ｑ（同（Ｂ）参照）よりも大きく設定されている。 Embodiment 2 FIG. 5 shows another embodiment of the present invention. The battery state detection unit 12 is similar to the first embodiment in that the convex portion 52 is provided at a position facing the terminal 22B of the housing 16 and the temperature sensor 50 is installed in the convex portion 52. The second embodiment is different from the first embodiment in that 52 is formed of elastic rubber in a direction to be pressed against the battery terminal 22B. The projecting dimension P from the surface of the casing 16 before the casing 16 is assembled to the battery 10 (see FIG. 5A) is the same as the casing 16 and the terminal 22B after the casing 16 is assembled to the battery 10. Is set to be larger than the interval Q (see (B)).

このようにすると、筐体１６をバッテリ１０に組み付けたときに、凸部５２が軸線方向に圧縮され、ゴムの弾性反発力で凸部５２の先端面が端子２２Ｂの表面に押し付けられるようになる。このため、凸部５２の先端面と端子２２Ｂの表面との間に空気層ができなくなり、端子２２Ｂから温度センサ５０へ伝熱性がよくなって、端子２２Ｂの温度をより正確に検出することができる。   In this way, when the housing 16 is assembled to the battery 10, the convex portion 52 is compressed in the axial direction, and the tip surface of the convex portion 52 is pressed against the surface of the terminal 22B by the elastic repulsive force of rubber. . For this reason, an air layer is not formed between the front end surface of the convex portion 52 and the surface of the terminal 22B, heat transfer from the terminal 22B to the temperature sensor 50 is improved, and the temperature of the terminal 22B can be detected more accurately. it can.

上記以外の構成は実施形態１と同じであるので、同一部分には同一符号を付して説明を省略する。   Since the configuration other than the above is the same as that of the first embodiment, the same portions are denoted by the same reference numerals and description thereof is omitted.

〔実施形態３〕 図６は本発明のさらに他の実施形態を示す。このバッテリ状態検知ユニット１２は、筐体１６の、バッテリ１０のケース５６と対向する面の面央部に、凹部５８を設け、この凹部５８内に温度センサ５０を設置したものである。温度センサ５０は、バッテリのケース５６に直接接触させてもよいが、図示のように、凹部５８内に熱伝導性のよい樹脂５４を充填して、温度センサ５０を樹脂５４で封止し、樹脂５４を介してバッテリのケース５６に間接的に接触させてもよい。樹脂５４で封止した方が温度センサ５０の保護が確実であり、伝熱面積も大きくとれる。また、筐体１０の内部には前記凹部５８を囲むように肉厚の断熱壁６０が設けられている。これは温度センサ５０が検知ユニット１２内の温度変化の影響を受けないようにするためである。 Embodiment 3 FIG. 6 shows still another embodiment of the present invention. In the battery state detection unit 12, a recess 58 is provided in the center of the surface of the housing 16 facing the case 56 of the battery 10, and the temperature sensor 50 is installed in the recess 58. Although the temperature sensor 50 may be in direct contact with the battery case 56, as shown in the drawing, the recess 58 is filled with a resin 54 having good thermal conductivity, and the temperature sensor 50 is sealed with the resin 54. The battery case 56 may be indirectly contacted via the resin 54. Sealing with the resin 54 ensures the protection of the temperature sensor 50 and increases the heat transfer area. A thick heat insulating wall 60 is provided inside the housing 10 so as to surround the recess 58. This is to prevent the temperature sensor 50 from being affected by temperature changes in the detection unit 12.

バッテリ１０に筐体１６を組み付けると、バッテリケース５６の筐体１６と対向する面は、放熱性が低下し、外界の温度変化の影響を受けにくくなるので、この面の温度（特に面央部の温度）はバッテリ１０の内部の温度と比較的よく対応している。したがってバッテリケース５６の筐体１６と対向する面の温度を測定すれば、バッテリ内部の温度を比較的精度よく測定することができる。上記以外の構成は実施形態１と同じであるので、同一部分には同一符号を付して説明を省略する。   When the housing 16 is assembled to the battery 10, the surface of the battery case 56 facing the housing 16 has reduced heat dissipation and is less susceptible to the influence of external temperature changes. Corresponds to the temperature inside the battery 10 relatively well. Therefore, if the temperature of the surface of the battery case 56 facing the housing 16 is measured, the temperature inside the battery can be measured with relatively high accuracy. Since the configuration other than the above is the same as that of the first embodiment, the same portions are denoted by the same reference numerals and description thereof is omitted.

〔その他の実施形態〕 図７は本発明のさらに他の実施形態を示す。このバッテリ状態検知ユニット１２は、温度センサ５０をバスバー２４Ｂ（又は２４Ａ）に接触させて、バスバー２４Ｂの温度を検出するようにしたものである。バスバー２４Ｂはバッテリの端子２２Ｂに接続されているため、バッテリの端子２２Ｂに近い温度になる。したがってバスバー２４Ｂの温度を測定することによってもバッテリ内部の温度を比較的精度よく測定することができる。上記以外の構成は実施形態１と同じであるので、同一部分には同一符号を付して説明を省略する。   Other Embodiments FIG. 7 shows still another embodiment of the present invention. The battery state detection unit 12 detects the temperature of the bus bar 24B by bringing the temperature sensor 50 into contact with the bus bar 24B (or 24A). Since the bus bar 24B is connected to the battery terminal 22B, the temperature is close to the battery terminal 22B. Therefore, the temperature inside the battery can also be measured with relatively high accuracy by measuring the temperature of the bus bar 24B. Since the configuration other than the above is the same as that of the first embodiment, the same portions are denoted by the same reference numerals and description thereof is omitted.

なお温度センサ５０をバスバー２４Ｂに接触させる位置は、図示のように筐体１６の中でもよいし、筐体１６の外でもよい。また温度センサ５０を回路基板１４の接続端子部２６Ｂ（又は２６Ａ）に接触又は近傍に配置して、接続端子部２６Ｂの温度を検出してもよい。   The position where the temperature sensor 50 is brought into contact with the bus bar 24 </ b> B may be inside the housing 16 as shown or outside the housing 16. Further, the temperature sensor 50 may be disposed in contact with or near the connection terminal portion 26B (or 26A) of the circuit board 14 to detect the temperature of the connection terminal portion 26B.

以上の実施形態は、バッテリの端子が金属板製で、温度センサを接触させる平面部を有する場合であるが、バッテリの端子が円柱状である場合には、バッテリ状態検知ユニットをバッテリの上に組み付ける構成として、温度センサをバッテリの端子の上端面に接触させるようにするとよい。   The above embodiment is a case where the battery terminal is made of a metal plate and has a flat portion that contacts the temperature sensor. However, when the battery terminal is cylindrical, the battery state detection unit is placed on the battery. As a structure to be assembled, the temperature sensor may be brought into contact with the upper end surface of the battery terminal.

本発明に係るバッテリ状態検知ユニットの一実施形態を、バッテリに組み付けた状態で示す斜視図。The perspective view which shows one Embodiment of the battery state detection unit which concerns on this invention in the state assembled | attached to the battery. 図１のバッテリ状態検知ユニットの要部の断面図。Sectional drawing of the principal part of the battery state detection unit of FIG. 図１のバッテリ状態検知ユニットの回路図。The circuit diagram of the battery state detection unit of FIG. 図１のバッテリ状態検知ユニットを取り付けた状態での各部の温度測定結果の一例を示すグラフ。The graph which shows an example of the temperature measurement result of each part in the state which attached the battery state detection unit of FIG. 本発明に係るバッテリ状態検知ユニットの他の実施形態を示すもので、（Ａ）はバッテリに組み付ける前の状態の断面図、（Ｂ）はバッテリに組み付けた後の状態の断面図。The other embodiment of the battery state detection unit which concerns on this invention is shown, (A) is sectional drawing of the state before attaching to a battery, (B) is sectional drawing of the state after attaching to a battery. 本発明に係るバッテリ状態検知ユニットのさらに他の実施形態を、バッテリに組み付けた状態で示す断面図。Sectional drawing which shows other embodiment of the battery state detection unit which concerns on this invention in the state assembled | attached to the battery. 本発明に係るバッテリ状態検知ユニットのさらに他の実施形態を、バッテリに組み付けた状態で示す断面図。Sectional drawing which shows other embodiment of the battery state detection unit which concerns on this invention in the state assembled | attached to the battery.

符号の説明Explanation of symbols

１０：バッテリ
１２：バッテリ状態検知ユニット
１４：プリント回路基板
１６：筐体
１８、２０：ブラケット
２２Ａ、２２Ｂ：端子
２４Ａ、２４Ｂ：バスバー
２６Ａ、２６Ｂ：接続端子部
３２：放電回路
３４：スイッチング素子
３６：放電制御部
３８：電圧検出部
４０：電流検出部
４２：演算部
４８：ＣＰＵ
５０：温度センサ
５２：凸部
５４：樹脂
５８：凹部
６０：断熱壁
10: battery 12: battery state detection unit 14: printed circuit board 16: housing 18, 20: brackets 22A, 22B: terminals 24A, 24B: bus bars 26A, 26B: connection terminal portion 32: discharge circuit 34: switching element 36: Discharge control unit 38: voltage detection unit 40: current detection unit 42: calculation unit 48: CPU
50: Temperature sensor 52: Convex part 54: Resin 58: Concave part 60: Thermal insulation wall

Claims (9)

バッテリの端子間に内部インピーダンス測定用の放電電流を流す放電回路と、前記放電電流を流したときのバッテリの端子間電圧を検出する電圧検出部と、前記放電電流を検出する電流検出部と、バッテリの温度を検出する温度センサと、検出された電圧、電流及び温度から、バッテリの温度に応じて補正されたバッテリの内部インピーダンスを算出する演算部と、これらを収容する筐体とを備えたバッテリ状態検知ユニットにおいて、
前記筐体はバッテリに組み付けられるように構成されており、
前記温度センサは、前記筐体をバッテリに組み付けたときに、バッテリの端子又はケースに直接又は他の部材を介して間接的に接触するように前記筐体に取り付けられていることを特徴とするバッテリ状態検知ユニット。 A discharge circuit for passing a discharge current for measuring internal impedance between terminals of the battery; a voltage detection unit for detecting a voltage between terminals of the battery when the discharge current is passed; a current detection unit for detecting the discharge current; A temperature sensor that detects the temperature of the battery, a calculation unit that calculates the internal impedance of the battery that is corrected according to the temperature of the battery from the detected voltage, current, and temperature, and a housing that accommodates them. In the battery status detection unit,
The housing is configured to be assembled to a battery;
The temperature sensor is attached to the casing so as to be in direct contact with a terminal or case of the battery directly or through another member when the casing is assembled to the battery. Battery state detection unit. 筐体には、先端がバッテリの端子に接触する凸部が設けられており、温度センサがこの凸部の中に設置されていることを特徴とする請求項１記載のバッテリ状態検知ユニット。   The battery state detection unit according to claim 1, wherein the casing is provided with a convex portion whose tip is in contact with a battery terminal, and a temperature sensor is installed in the convex portion. 凸部の中に設置された温度センサが、凸部内に充填された樹脂で封止されていることを特徴とする請求項２記載のバッテリ状態検知ユニット。   The battery state detection unit according to claim 2, wherein a temperature sensor installed in the convex portion is sealed with a resin filled in the convex portion. 凸部がゴムで形成され、凸部の先端がゴムの弾性反発力でバッテリの端子に押し付けられるようになっていることを特徴とする請求項２又は３記載のバッテリ状態検知ユニット。   4. The battery state detection unit according to claim 2, wherein the convex portion is formed of rubber, and the tip of the convex portion is pressed against the battery terminal by the elastic repulsive force of rubber. 凸部が断熱性の壁で囲まれていることを特徴とする請求項２ないし４のいずれかに記載のバッテリ状態検知ユニット。   The battery state detection unit according to claim 2, wherein the convex portion is surrounded by a heat insulating wall. 筐体には、バッテリのケースと対向する面に凹部が設けられており、温度センサはこの凹部内にバッテリのケースに直接又は他の部材を介して間接的に接触するように設置されていることを特徴とする請求項１記載のバッテリ状態検知ユニット。   The casing is provided with a recess on the surface facing the battery case, and the temperature sensor is installed in the recess so as to be in direct contact with the battery case or indirectly through another member. The battery state detection unit according to claim 1. 凹部内に設置された温度センサが、凹部に充填された樹脂で封止されていることを特徴とする請求項６記載のバッテリ状態検知ユニット。   The battery state detection unit according to claim 6, wherein the temperature sensor installed in the recess is sealed with a resin filled in the recess. 筐体の内部に前記凹部を囲むように断熱性の壁が設けられていることを特徴とする請求項６又は７記載のバッテリ状態検知ユニット。   The battery state detection unit according to claim 6 or 7, wherein a heat insulating wall is provided inside the casing so as to surround the recess. 放電回路のプラス側接続端子部がバスバーによりバッテリのプラス端子に、放電回路のマイナス側接続端子部がバスバーによりバッテリのマイナス端子に接続されるようになっていることを特徴とする請求項１記載のバッテリ状態検知ユニット。
2. The positive side connection terminal portion of the discharge circuit is connected to the positive terminal of the battery by the bus bar, and the negative side connection terminal portion of the discharge circuit is connected to the negative terminal of the battery by the bus bar. Battery status detection unit.
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Cited By (13)

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JP2007263817A (en) * 2006-03-29 2007-10-11 Furukawa Electric Co Ltd:The Battery state detection device
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JP2016080478A (en) * 2014-10-15 2016-05-16 株式会社ケーヒン Voltage detecting device

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