JP2021113685A - Electric current measurement device - Google Patents

Electric current measurement device Download PDF

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JP2021113685A
JP2021113685A JP2020005025A JP2020005025A JP2021113685A JP 2021113685 A JP2021113685 A JP 2021113685A JP 2020005025 A JP2020005025 A JP 2020005025A JP 2020005025 A JP2020005025 A JP 2020005025A JP 2021113685 A JP2021113685 A JP 2021113685A
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shunt
main surface
resistor
wall portion
circuit board
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隆介 長谷
Ryusuke Hase
隆介 長谷
悟士 山本
Satoshi Yamamoto
悟士 山本
智之 伊藤
Tomoyuki Ito
智之 伊藤
裕人 佐藤
Hiroto Sato
裕人 佐藤
皓子 安谷屋
Hiroko Ataya
皓子 安谷屋
真一 会沢
Shinichi Aizawa
真一 会沢
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Toyota Industries Corp
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Toyota Industries Corp
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Priority to JP2020005025A priority Critical patent/JP2021113685A/en
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Abstract

To provide an electric current measurement device that can make heat generating in a shunt resistor hard to affect a circuit substrate.SOLUTION: An electric current measurement device 50 has: a shunt resistor 40; a circuit substrate 31; and a case 13 that stores the circuit substrate 31 in a state with a control side substrate principal plane 34a and facing substrate principal plane 34b of the circuit substrate 31 covered, and defines a storage space S of the circuit substrate 31. The case 13 has a connection wall part 18 that faces a facing shunt principal plane 40c of the shunt resistor 40, and the connection wall part 18 lies between the facing shunt principal plane 40c and the storage space S of the case 13, and an open shunt principal plane 40b is exposed toward the outside of the case 13.SELECTED DRAWING: Figure 7

Description

本発明は、シャント抵抗器と、回路基板と、ケースとを有する電流計測装置に関する。 The present invention relates to a current measuring device having a shunt resistor, a circuit board, and a case.

バッテリと、バッテリを電力源として駆動する負荷と、を備えた装置では、過電流が生じているか否かの判定や、バッテリの充電率を推定することを目的としてバッテリの電流が計測されている。電流計測装置としては、シャント抵抗器を用いた電流計測装置がある（例えば、特許文献１参照）。 In a device equipped with a battery and a load driven by the battery as a power source, the current of the battery is measured for the purpose of determining whether or not an overcurrent has occurred and estimating the charge rate of the battery. .. As the current measuring device, there is a current measuring device using a shunt resistor (see, for example, Patent Document 1).

電流計測装置としての特許文献１に記載の電子機器は、シャント抵抗器と電気的に接続される回路基板と、回路基板を内部に収納する筐体と、を有する。筐体は、回路基板を収納する部位と、回路基板を収納する部位から突出する台座と、台座と離間して設けられた突出部と、を有する。そして、特許文献１において、回路基板は筐体に収納されるとともに、シャント抵抗器は筐体の外部において板厚方向の両面が台座と突出部によって挟持された状態で台座に載置されている。 The electronic device described in Patent Document 1 as a current measuring device includes a circuit board that is electrically connected to a shunt resistor and a housing that houses the circuit board inside. The housing has a portion for accommodating the circuit board, a pedestal protruding from the portion for accommodating the circuit board, and a protruding portion provided apart from the pedestal. Then, in Patent Document 1, the circuit board is housed in the housing, and the shunt resistor is placed on the pedestal in a state where both sides in the plate thickness direction are sandwiched between the pedestal and the protruding portion outside the housing. ..

しかし、特許文献１のように、台座及び突出部が、筐体における回路基板を収納する部位から突出していると筐体が大型化し、電流計測装置が大型化するため、電流計測装置の小型化が望まれている。 However, as in Patent Document 1, if the pedestal and the protruding portion protrude from the portion of the housing that houses the circuit board, the housing becomes larger and the current measuring device becomes larger, so that the current measuring device becomes smaller. Is desired.

例えば、特許文献２に記載の電流計測装置８０は、図８に示すように、シャント抵抗器８１と、回路基板８２と、ケース８３と、を備える。シャント抵抗器８１は、抵抗体８１ａと、抵抗体８１ａを挟む状態で接合された一対の電極８２ｂと、を備える。回路基板８２は、シャント抵抗器８１の厚さ方向両面の主面に対して垂直に立設され、回路基板８２の基板主面８２ａは、シャント抵抗器８１の主面に対し直交している。回路基板８２の基板主面８２ａには図示しない電子部品が実装されている。電流計測装置８０の回路基板８２は、ケース８３の内部に収容されるとともに、シャント抵抗器８１は、ケース８３の開口部を塞ぐ状態でケース８３に固定されている。ケース８３には、シャント抵抗器８１の両主面を挟持するための台座及び突出部が無いため、台座及び突出部を備える場合と比べて小型化されている。 For example, the current measuring device 80 described in Patent Document 2 includes a shunt resistor 81, a circuit board 82, and a case 83, as shown in FIG. The shunt resistor 81 includes a resistor 81a and a pair of electrodes 82b that are joined so as to sandwich the resistor 81a. The circuit board 82 is erected perpendicularly to the main surfaces of both sides of the shunt resistor 81 in the thickness direction, and the substrate main surface 82a of the circuit board 82 is orthogonal to the main surface of the shunt resistor 81. Electronic components (not shown) are mounted on the substrate main surface 82a of the circuit board 82. The circuit board 82 of the current measuring device 80 is housed inside the case 83, and the shunt resistor 81 is fixed to the case 83 so as to close the opening of the case 83. Since the case 83 does not have a pedestal and a protrusion for sandwiching both main surfaces of the shunt resistor 81, the case 83 is smaller than the case provided with the pedestal and the protrusion.

特開２０１９−１８４４００号公報JP-A-2019-184400 特開２０１８−４８８４０号公報JP-A-2018-48840

ところが、特許文献２の電流計測装置８０においては、シャント抵抗器８１に電流が流れ、シャント抵抗器８１に熱が発生したとき、シャント抵抗器８１からの熱の放出先に存在する回路基板８２に熱が及んでしまう。 However, in the current measuring device 80 of Patent Document 2, when a current flows through the shunt resistor 81 and heat is generated in the shunt resistor 81, the circuit board 82 existing at the discharge destination of the heat from the shunt resistor 81 The heat will reach you.

本発明の目的は、シャント抵抗器で発生した熱を回路基板に及びにくくできる電流計測装置を提供することにある。 An object of the present invention is to provide a current measuring device capable of making it difficult for heat generated by a shunt resistor to reach a circuit board.

上記問題点を解決するための電流計測装置は、電流経路に設けられる電流計測装置であって、平板状の抵抗体、及び当該抵抗体の厚さ方向に交差する一つの方向である並設方向に沿って前記抵抗体を挟む一対の電極端子を有するシャント抵抗器と、前記抵抗体の前記一対の電極端子の電圧を計測する制御部が一対の基板主面のうちの一方に配置された回路基板と、前記回路基板の両方の前記基板主面を覆う状態で当該回路基板を収容するとともに前記回路基板の収容空間を画成するケースと、を有しており、前記シャント抵抗器は、前記抵抗体の前記厚さ方向の両面にシャント主面を有し、前記シャント抵抗器の一対の前記シャント主面のうち、前記回路基板に近い一方の前記シャント主面を対向シャント主面とするとともに他方の前記シャント主面を開放シャント主面とし、前記回路基板の一対の前記基板主面のうち、前記シャント抵抗器に近い一方の前記基板主面を対向基板主面とすると、前記ケースは、前記対向シャント主面と対向し、かつ前記収容空間を画成する対向壁部を有し、前記対向壁部は、前記対向シャント主面と前記収容空間との間に介在するとともに、前記開放シャント主面は前記ケースの外部に向けて露出していることを要旨とする。 The current measuring device for solving the above problems is a current measuring device provided in the current path, and is a flat plate-shaped resistor and a parallel direction which is one direction intersecting the thickness direction of the resistor. A circuit in which a shunt resistor having a pair of electrode terminals sandwiching the resistor and a control unit for measuring the voltage of the pair of electrode terminals of the resistor are arranged on one of a pair of substrate main surfaces. The shunt resistor includes a substrate and a case in which the circuit board is accommodated so as to cover the main surfaces of both of the circuit boards and the accommodation space of the circuit board is defined. The shunt main surface is provided on both sides of the resistor in the thickness direction, and of the pair of shunt main surfaces of the shunt resistor, one of the shunt main surfaces close to the circuit board is used as the facing shunt main surface. Assuming that the other main surface of the shunt is the main surface of the open shunt and one of the main surfaces of the substrate close to the shunt resistor among the pair of main surfaces of the circuit board is the main surface of the opposite substrate, the case is: It has a facing wall portion that faces the main surface of the facing shunt and defines the accommodation space, and the facing wall portion is interposed between the main surface of the facing shunt and the accommodation space and the open shunt. The gist is that the main surface is exposed to the outside of the case.

これによれば、シャント抵抗器に電流が流れると、抵抗体及び電極端子が発熱し、シャント抵抗器が発熱する。シャント抵抗器で発生した熱は、主に開放シャント主面からケースの外部に向けて放出される。このため、例えば、シャント抵抗器がケースの収容空間に収容され、シャント抵抗器の両方のシャント主面がケースに覆われている場合と比べると、シャント抵抗器の放熱性を高めることができる。また、開放シャント主面からの放熱があるため、対向シャント主面からの放熱量が抑えられ、さらに、対向シャント主面から放出された熱は、ケースの対向壁部に伝わる。このため、シャント抵抗器の対向シャント主面と、回路基板の対向基板主面とが近い構造であっても、回路基板の対向基板主面には熱を及びにくくできる。 According to this, when a current flows through the shunt resistor, the resistor and the electrode terminals generate heat, and the shunt resistor generates heat. The heat generated by the shunt resistor is mainly released from the main surface of the open shunt toward the outside of the case. Therefore, for example, the heat dissipation of the shunt resistor can be improved as compared with the case where the shunt resistor is housed in the housing space of the case and both shunt main surfaces of the shunt resistor are covered with the case. Further, since heat is dissipated from the main surface of the open shunt, the amount of heat dissipated from the main surface of the facing shunt is suppressed, and the heat released from the main surface of the facing shunt is transferred to the facing wall portion of the case. Therefore, even if the main surface of the facing shunt of the shunt resistor and the main surface of the facing board of the circuit board are close to each other, it is possible to prevent heat from being applied to the main surface of the facing board of the circuit board.

また、電流計測装置について、前記ケースは、前記収容空間と前記ケースの外部とを連通する連通口を有するとともに、当該連通口を形成する連通口壁部を有し、前記連通口壁部の外面に対し前記対向壁部の外面が交差し、前記シャント抵抗器において前記対向シャント主面及び前記開放シャント主面を繋ぐ側端面は、前記連通口の開口に面している、又は前記連通口内に位置していてもよい。 Further, regarding the current measuring device, the case has a communication port for communicating the accommodation space and the outside of the case, and also has a communication port wall portion forming the communication port, and has an outer surface of the communication port wall portion. On the other hand, the outer surfaces of the facing wall portions intersect with each other, and the side end surface connecting the facing shunt main surface and the open shunt main surface in the shunt resistor faces the opening of the communication port or is inside the communication port. It may be located.

これによれば、例えば、シャント抵抗器の側端面が連通口の開口から離れている場合と比べると、シャント抵抗器によって連通口から収容空間内への異物の侵入を抑制できる。
また、電流計測装置について、前記シャント抵抗器と、前記回路基板には接続部材が接続され、前記接続部材は、前記シャント抵抗器に固定される平板状の抵抗側接続部と、前記回路基板に固定される平板状の基板側接続部とを有するとともに、前記抵抗側接続部と前記基板側接続部とは交差しており、当該接続部材によって前記シャント抵抗器と前記回路基板とが一体化され、前記抵抗側接続部が前記連通口を通じて前記ケースの外部に配置されていてもよい。 According to this, for example, as compared with the case where the side end surface of the shunt resistor is separated from the opening of the communication port, the shunt resistor can suppress the invasion of foreign matter from the communication port into the accommodation space.
Further, regarding the current measuring device, a connecting member is connected to the shunt resistor and the circuit board, and the connecting member is connected to the flat plate-shaped resistance side connecting portion fixed to the shunt resistor and the circuit board. It has a flat plate-shaped substrate-side connection portion to be fixed, and the resistance-side connection portion and the substrate-side connection portion intersect, and the shunt resistor and the circuit board are integrated by the connection member. , The resistance side connection portion may be arranged outside the case through the communication port.

これによれば、シャント抵抗器で発生した熱は、抵抗側接続部及び基板側接続部を介して回路基板に伝わるが、接続部材は、回路基板とは別体であるため、回路基板に対する伝熱を抑制できる。 According to this, the heat generated by the shunt resistor is transferred to the circuit board via the resistance side connection part and the board side connection part, but since the connection member is separate from the circuit board, it is transferred to the circuit board. Heat can be suppressed.

また、電流計測装置について、前記基板側接続部は、前記対向基板主面に接続されるとともに、前記抵抗側接続部は、前記対向シャント主面に接続されていてもよい。
これによれば、シャント抵抗器と回路基板が接続部材によって一体化される構成において、例えば、基板側接続部が一対の基板主面のうちの対向基板主面とは別の基板主面に接続されるとともに、抵抗側接続部が開放シャント主面に接続される場合と比べて、シャント抵抗器と回路基板を離すことができ、シャント抵抗器から回路基板へ熱を及びにくくできる。 Further, regarding the current measuring device, the substrate side connection portion may be connected to the facing substrate main surface, and the resistance side connection portion may be connected to the facing shunt main surface.
According to this, in a configuration in which a shunt resistor and a circuit board are integrated by a connecting member, for example, a board-side connecting portion is connected to a board main surface of a pair of board main surfaces different from the facing board main surface. At the same time, the shunt resistor and the circuit board can be separated from each other as compared with the case where the resistance side connection portion is connected to the main surface of the open shunt, and heat can be less likely to be transferred from the shunt resistor to the circuit board.

また、電流計測装置について、一対の前記電極端子は、当該電極端子に外部接続部材を接続するための螺合部材が挿通される連結孔を有し、前記対向壁部は、前記連結孔と重合する位置に前記螺合部材が螺合されるナットを支持するナット受部を有していてもよい。 Further, regarding the current measuring device, the pair of electrode terminals has a connecting hole through which a screwing member for connecting an external connecting member is inserted, and the facing wall portion overlaps with the connecting hole. A nut receiving portion for supporting the nut into which the screwing member is screwed may be provided at a position where the screwing member is screwed.

これによれば、ナット受部によってナットが支持されるため、例えば、連結孔に重合する位置にナットを手で支持しながら螺合部材の螺合作業をする場合と比べて、ナットに螺合部材を螺合する作業が行いやすい。 According to this, since the nut is supported by the nut receiving portion, for example, the nut is screwed into the nut as compared with the case where the screwing member is screwed while manually supporting the nut at a position where it overlaps with the connecting hole. The work of screwing the members is easy to perform.

また、電流計測装置について、前記対向壁部には前記シャント抵抗器が支持されていてもよい。
これによれば、シャント抵抗器を安定した状態に支持できるとともに、振動等に伴ってシャント抵抗器が振動することを抑制できる。 Further, regarding the current measuring device, the shunt resistor may be supported on the facing wall portion.
According to this, the shunt resistor can be supported in a stable state, and the shunt resistor can be suppressed from vibrating due to vibration or the like.

また、電流計測装置について、前記ケースは、前記開放シャント主面における前記抵抗体を覆う被覆壁部を有していてもよい。
これによれば、被覆壁部により、抵抗体に異物が付着しにくくなる。このため、抵抗体への異物の付着による抵抗体の抵抗変動に伴って生じる、電流計測の誤差を抑制できる。 Further, with respect to the current measuring device, the case may have a covering wall portion covering the resistor on the main surface of the open shunt.
According to this, the covering wall portion makes it difficult for foreign matter to adhere to the resistor. Therefore, it is possible to suppress the error of current measurement caused by the resistance fluctuation of the resistor due to the adhesion of foreign matter to the resistor.

本発明によれば、シャント抵抗器で発生した熱を回路基板に及びにくくできる。 According to the present invention, the heat generated by the shunt resistor can be made difficult to reach the circuit board.

電池パックを示す斜視図。The perspective view which shows the battery pack. 電流計測装置を示す分解斜視図。An exploded perspective view showing a current measuring device. 電流計測装置を示す平面図。The plan view which shows the current measuring apparatus. シャント抵抗器、回路基板、接続部材を示す部分斜視図。Partial perspective view showing a shunt resistor, a circuit board, and a connecting member. 電流計測装置におけるシャント抵抗器を示す部分斜視図。A partial perspective view showing a shunt resistor in a current measuring device. 電流計測装置を示す断面図。A cross-sectional view showing a current measuring device. 電流計測装置を示す断面図。A cross-sectional view showing a current measuring device. 背景技術を示す図。The figure which shows the background technology.

以下、電流計測装置を具体化した一実施形態を図１〜図７にしたがって説明する。
図１に示すように、電池パック１０は、パックケース１１内に複数の二次電池１２を備える。二次電池１２は、リチウムイオン電池やニッケル水素電池など充放電可能なものであればどのようなものを用いていてもよい。複数の二次電池１２同士は直列接続されている。なお、複数の二次電池１２は、並列接続されていてもよいし、直列接続、又は並列接続された複数の二次電池１２同士を直列接続や並列接続したものであってもよい。即ち、複数の二次電池１２同士の接続態様は任意である。 Hereinafter, an embodiment in which the current measuring device is embodied will be described with reference to FIGS. 1 to 7.
As shown in FIG. 1, the battery pack 10 includes a plurality of secondary batteries 12 in the pack case 11. As the secondary battery 12, any battery such as a lithium ion battery or a nickel hydrogen battery that can be charged and discharged may be used. The plurality of secondary batteries 12 are connected in series. The plurality of secondary batteries 12 may be connected in parallel, or may be connected in series, or a plurality of secondary batteries 12 connected in parallel may be connected in series or in parallel. That is, the connection mode between the plurality of secondary batteries 12 is arbitrary.

電池パック１０は、ＥＶやＰＨＶの電源として搭載されている。電池パック１０は、モータ等の負荷への供給電力を蓄える。複数の二次電池１２が並ぶ方向は、パックケース１１の長手方向と一致している。 The battery pack 10 is mounted as a power source for EVs and PHVs. The battery pack 10 stores power supplied to a load such as a motor. The direction in which the plurality of secondary batteries 12 are lined up coincides with the longitudinal direction of the pack case 11.

電池パック１０は、当該電池パック１０から負荷への電力経路に設けられた電流計測装置５０を備える。電流計測装置５０は、負荷への電流経路に流れる電流を計測する。電流計測装置５０は、ケース１３と、ケース１３に収容される回路基板３１と、回路基板３１と信号接続されるシャント抵抗器４０と、を有する。電流計測装置５０は、パックケース１１の長手方向の両端面のうちの一端面である取付面１１ａに取り付けられている。 The battery pack 10 includes a current measuring device 50 provided in the power path from the battery pack 10 to the load. The current measuring device 50 measures the current flowing in the current path to the load. The current measuring device 50 includes a case 13, a circuit board 31 housed in the case 13, and a shunt resistor 40 signal-connected to the circuit board 31. The current measuring device 50 is attached to the mounting surface 11a, which is one end surface of both end faces in the longitudinal direction of the pack case 11.

図２に示すように、ケース１３は、有底箱状の金属製の第１ケース部材１４と、有蓋筒状の合成樹脂製の第２ケース部材１５とを有する。第１ケース部材１４は、四角板状の底板１４ａと、底板１４ａの縁から四角筒状に立設する第１周壁１４ｂと、底板１４ａから立設された複数の基板取付ボス１４ｃと、第１周壁１４ｂの四隅に位置する貫通孔１４ｄと、を有する。基板取付ボス１４ｃの内周面には図示しない雌ねじが設けられている。第１ケース部材１４の内側には、底板１４ａと第１周壁１４ｂによって画成された第１収容部Ｓ１が画成されている。 As shown in FIG. 2, the case 13 has a bottomed box-shaped first case member 14 made of metal and a covered tubular second case member 15 made of synthetic resin. The first case member 14 includes a square plate-shaped bottom plate 14a, a first peripheral wall 14b erected from the edge of the bottom plate 14a in a square tubular shape, a plurality of board mounting bosses 14c erected from the bottom plate 14a, and a first. It has through holes 14d located at the four corners of the peripheral wall 14b. A female screw (not shown) is provided on the inner peripheral surface of the board mounting boss 14c. Inside the first case member 14, a first accommodating portion S1 defined by a bottom plate 14a and a first peripheral wall 14b is defined.

第１ケース部材１４の開口部を閉塞する第２ケース部材１５は、第１ケース部材１４に向けて開口する。第２ケース部材１５は、板状の第１蓋板１６と、第１蓋板１６よりも第２ケース部材１５の開口寄りに位置し第１蓋板１６と段違いに位置する第２蓋板１７と、第１蓋板１６と第２蓋板１７を繋ぐ接続壁部１８と、を有する。 The second case member 15 that closes the opening of the first case member 14 opens toward the first case member 14. The second case member 15 is a plate-shaped first lid plate 16 and a second lid plate 17 located closer to the opening of the second case member 15 than the first lid plate 16 and located at a step difference from the first lid plate 16. And a connecting wall portion 18 connecting the first lid plate 16 and the second lid plate 17.

なお、第２ケース部材１５において、第２蓋板１７の外面１７ａに沿い、かつ第２蓋板１７の長手の延びる方向を第１方向Ｘとし、外面１７ａに沿い、かつ第１方向Ｘに直交する方向を第２方向Ｙとする。第２方向Ｙは、第２蓋板１７の外面１７ａの短手方向と一致する。さらに、第１方向Ｘ及び第２方向Ｙに直交する方向を第３方向Ｚとする。第３方向Ｚは、第２ケース部材１５の深さ方向と一致する。 In the second case member 15, the direction in which the length of the second lid plate 17 extends along the outer surface 17a of the second lid plate 17 is defined as the first direction X, along the outer surface 17a, and orthogonal to the first direction X. Let the second direction Y be. The second direction Y coincides with the lateral direction of the outer surface 17a of the second lid plate 17. Further, the direction orthogonal to the first direction X and the second direction Y is defined as the third direction Z. The third direction Z coincides with the depth direction of the second case member 15.

第２蓋板１７は、第１蓋板１６の第１方向Ｘの一端から他端に向かう途中位置まで設けられており、第１蓋板１６の第１方向Ｘの他端側には第２蓋板１７が設けられていない。そして、ケース１３を第１蓋板１６の外面１６ａ側から見た正面視において、第２蓋板１７及び接続壁部１８は、ケース１３の正面視の外形の中に位置している。 The second lid plate 17 is provided from one end of the first lid plate 16 in the first direction X to an intermediate position toward the other end, and a second lid plate 16 is provided on the other end side of the first direction X of the first lid plate 16. The lid plate 17 is not provided. When the case 13 is viewed from the outer surface 16a side of the first lid plate 16, the second lid plate 17 and the connecting wall portion 18 are located inside the outer shape of the case 13 in the front view.

第２ケース部材１５は、第１蓋板１６、第２蓋板１７、及び接続壁部１８の第１方向Ｘの一端に繋がる第１側壁部１９ａを有するとともに、第１蓋板１６の第１方向Ｘの他端に繋がる第２側壁部１９ｂを有する。さらに、第２ケース部材１５は、第２蓋板１７の第２方向Ｙの両端縁のうち、接続壁部１８とは反対側の端縁に繋がるとともに第１蓋板１６の第１方向Ｘの他端に繋がる第１壁部２０と、第１蓋板１６の第２方向Ｙの両端縁のうち、接続壁部１８とは反対側の端縁に繋がる第２壁部２１と、を有する。第１側壁部１９ａと第２側壁部１９ｂは、第１方向Ｘに対向し、第１壁部２０と第２壁部２１は、第２方向Ｙに対向する。第２ケース部材１５は、第１壁部２０と、第２壁部２１と、第１側壁部１９ａと、第２側壁部１９ｂによって筒状に形成されている。 The second case member 15 has a first side wall portion 19a connected to one end of the first lid plate 16, the second lid plate 17, and the connection wall portion 18 in the first direction X, and the first lid plate 16 is the first. It has a second side wall portion 19b connected to the other end of the direction X. Further, the second case member 15 is connected to the end edge of the second lid plate 17 in the second direction Y opposite to the connecting wall portion 18, and is connected to the edge of the first lid plate 16 in the first direction X. It has a first wall portion 20 connected to the other end, and a second wall portion 21 connected to the end edge of the first lid plate 16 in the second direction Y opposite to the connecting wall portion 18. The first side wall portion 19a and the second side wall portion 19b face each other in the first direction X, and the first wall portion 20 and the second wall portion 21 face each other in the second direction Y. The second case member 15 is formed in a tubular shape by the first wall portion 20, the second wall portion 21, the first side wall portion 19a, and the second side wall portion 19b.

第２ケース部材１５の内側には、第１蓋板１６と、第２蓋板１７と、接続壁部１８と、第１壁部２０と、第２壁部２１と、第１側壁部１９ａと、第２側壁部１９ｂと、によって画成された第２収容部Ｓ２が画成されている。 Inside the second case member 15, a first lid plate 16, a second lid plate 17, a connecting wall portion 18, a first wall portion 20, a second wall portion 21, and a first side wall portion 19a are formed. , The second side wall portion 19b, and the second accommodating portion S2 defined by the second side wall portion 19b are defined.

第１蓋板１６の外面１６ａと第２蓋板１７の外面１７ａは平行である。接続壁部１８の外面１８ａは、第１蓋板１６の外面１６ａ及び第２蓋板１７の外面１７ａに直交する。第２ケース部材１５において、第１蓋板１６と第２蓋板１７と接続壁部１８が設けられた部分は段差状である。 The outer surface 16a of the first lid plate 16 and the outer surface 17a of the second lid plate 17 are parallel to each other. The outer surface 18a of the connecting wall portion 18 is orthogonal to the outer surface 16a of the first lid plate 16 and the outer surface 17a of the second lid plate 17. In the second case member 15, the portion where the first lid plate 16, the second lid plate 17, and the connecting wall portion 18 is provided has a stepped shape.

図５に示すように、第２ケース部材１５は、第２蓋板１７の板厚方向である第３方向Ｚに貫通する連通口１７ｂを有する。連通口１７ｂは、第２ケース部材１５の第２収容部Ｓ２と、第２ケース部材１５の外部とを連通させる。本実施形態では、第２蓋板１７が、連通口１７ｂを形成する連通口壁部を構成している。 As shown in FIG. 5, the second case member 15 has a communication port 17b penetrating in the third direction Z, which is the plate thickness direction of the second lid plate 17. The communication port 17b communicates the second accommodating portion S2 of the second case member 15 with the outside of the second case member 15. In the present embodiment, the second lid plate 17 constitutes a communication port wall portion forming the communication port 17b.

図２又は図７に示すように、第２ケース部材１５は、接続壁部１８の外面１８ａから凹む一対のナット受部１８ｃを有する。各ナット受部１８ｃにはナット６３が嵌入されている。ナット６３は、ナット受部１８ｃの内底面に支持され、ナット受部１８ｃに支持されている。なお、ナット６３は、接続壁部１８の外面１８ａから飛び出しておらず、ナット６３の軸方向の両端面のうち、ナット受部１８ｃに支持されていない端面は、接続壁部１８の外面１８ａと面一である。ただし、ナット６３の軸方向の両端面のうち、ナット受部１８ｃに支持されていない端面は、接続壁部１８の外面１８ａより凹んだ位置にあってもよい。 As shown in FIG. 2 or 7, the second case member 15 has a pair of nut receiving portions 18c recessed from the outer surface 18a of the connecting wall portion 18. A nut 63 is fitted in each nut receiving portion 18c. The nut 63 is supported on the inner bottom surface of the nut receiving portion 18c, and is supported by the nut receiving portion 18c. The nut 63 does not protrude from the outer surface 18a of the connecting wall portion 18, and the end faces of both end faces of the nut 63 in the axial direction that are not supported by the nut receiving portion 18c are the outer surfaces 18a of the connecting wall portion 18. It is flush. However, of the both end faces of the nut 63 in the axial direction, the end faces not supported by the nut receiving portion 18c may be recessed from the outer surface 18a of the connecting wall portion 18.

図２に示すように、第２ケース部材１５は、接続壁部１８を第２方向Ｙに貫通する一対のリベット収容部１８ｄを有する。各リベット収容部１８ｄは、第３方向Ｚにおける第２蓋板１７側の一端から、接続壁部１８の一部を切り欠いて形成されている。一対のリベット収容部１８ｄは、第１方向Ｘにおける一対のナット受部１８ｃの間に位置する。各リベット収容部１８ｄには、後述する抵抗用リベット６５の端部が収容される。また、第２ケース部材１５は、第１側壁部１９ａを板厚方向に貫通するコネクタ貫通孔１９ｃを有する。 As shown in FIG. 2, the second case member 15 has a pair of rivet accommodating portions 18d penetrating the connecting wall portion 18 in the second direction Y. Each rivet accommodating portion 18d is formed by cutting out a part of the connecting wall portion 18 from one end on the second lid plate 17 side in the third direction Z. The pair of rivet accommodating portions 18d are located between the pair of nut receiving portions 18c in the first direction X. Each rivet accommodating portion 18d accommodates an end portion of a resistance rivet 65, which will be described later. Further, the second case member 15 has a connector through hole 19c that penetrates the first side wall portion 19a in the plate thickness direction.

図３又は図５に示すように、第２ケース部材１５は、第２蓋板１７の外面１７ａから第３方向Ｚに突出する被覆壁部２３を有する。被覆壁部２３は、第２蓋板１７の外面１７ａのうち、第２蓋板１７の連通口１７ｂよりも第２方向Ｙに沿った第１壁部２０寄りから突出している。被覆壁部２３は、第１方向Ｘに長手が延びる平板状である。また、被覆壁部２３は、当該被覆壁部２３の短手が第３方向Ｚに延びるように第２蓋板１７から突出する。被覆壁部２３は、第２方向Ｙにおいて接続壁部１８の外面１８ａに対向する被覆面２３ｂを有する。第２ケース部材１５を第２蓋板１７の外面１７ａから見た正面視では、接続壁部１８の外面１８ａと、被覆壁部２３の被覆面２３ｂとは対向するとともに、第２方向Ｙに離間している。被覆壁部２３は、板厚方向における被覆面２３ｂと反対側に外面２３ａを有する。被覆壁部２３は、接続壁部１８に設けられた一対のリベット収容部１８ｄを覆う。 As shown in FIG. 3 or 5, the second case member 15 has a covering wall portion 23 projecting from the outer surface 17a of the second lid plate 17 in the third direction Z. The covering wall portion 23 projects from the outer surface 17a of the second lid plate 17 toward the first wall portion 20 along the second direction Y with respect to the communication port 17b of the second lid plate 17. The covering wall portion 23 has a flat plate shape whose length extends in the first direction X. Further, the covering wall portion 23 projects from the second lid plate 17 so that the short side of the covering wall portion 23 extends in the third direction Z. The covering wall portion 23 has a covering surface 23b facing the outer surface 18a of the connecting wall portion 18 in the second direction Y. When the second case member 15 is viewed from the outer surface 17a of the second lid plate 17, the outer surface 18a of the connecting wall portion 18 and the covering surface 23b of the covering wall portion 23 face each other and are separated from each other in the second direction Y. is doing. The covering wall portion 23 has an outer surface 23a on the side opposite to the covering surface 23b in the plate thickness direction. The covering wall portion 23 covers a pair of rivet accommodating portions 18d provided on the connecting wall portion 18.

第２ケース部材１５は、第１壁部２０の外面２０ａから突出する絶縁リブ２４を有する。第２ケース部材１５を接続壁部１８の外面１８ａから見た平面視では、絶縁リブ２４はＬ形状であり、接続壁部１８の２辺に沿って設けられている。 The second case member 15 has an insulating rib 24 protruding from the outer surface 20a of the first wall portion 20. When the second case member 15 is viewed from the outer surface 18a of the connecting wall portion 18, the insulating rib 24 has an L shape and is provided along two sides of the connecting wall portion 18.

第２ケース部材１５は、第２蓋板１７の外面１７ａ、絶縁リブ２４及び被覆壁部２３の外面２３ａに繋がる補強リブ２５を複数有する。複数の補強リブ２５は、第１方向Ｘに沿って等間隔おきに設けられている。 The second case member 15 has a plurality of reinforcing ribs 25 connected to the outer surface 17a of the second lid plate 17, the insulating rib 24, and the outer surface 23a of the covering wall portion 23. The plurality of reinforcing ribs 25 are provided at equal intervals along the first direction X.

図２に示すように、後に詳述する回路基板３１を貫通させた基板取付ねじ２７を基板取付ボス１４ｃに螺合することで第１ケース部材１４に回路基板３１が取り付けられる。また、第１ケース部材１４の貫通孔１４ｄに挿通されたケース固定ねじ２６が、第２ケース部材１５の雌ねじ孔１５ｄに螺合されることで第１ケース部材１４と第２ケース部材１５が組付けられている。第１ケース部材１４と第２ケース部材１５が一体に組付けられることによりケース１３が構成されるとともに、第１ケース部材１４の第１収容部Ｓ１と、第２ケース部材１５の第２収容部Ｓ２とが組み合わされて収容空間Ｓが画成されている。上記したように、収容空間Ｓを構成する第２収容部Ｓ２は、第１蓋板１６と、第２蓋板１７と、接続壁部１８と、第１壁部２０と、第２壁部２１と、第１側壁部１９ａと、第２側壁部１９ｂとから画成されている。このため、第２蓋板１７及び接続壁部１８は、収容空間Ｓを画成していると言える。 As shown in FIG. 2, the circuit board 31 is attached to the first case member 14 by screwing the board mounting screw 27 that penetrates the circuit board 31 described in detail later into the board mounting boss 14c. Further, the case fixing screw 26 inserted into the through hole 14d of the first case member 14 is screwed into the female screw hole 15d of the second case member 15, so that the first case member 14 and the second case member 15 are assembled. It is attached. The case 13 is configured by integrally assembling the first case member 14 and the second case member 15, and the first accommodating portion S1 of the first case member 14 and the second accommodating portion of the second case member 15 are assembled. The accommodation space S is defined in combination with S2. As described above, the second accommodating portion S2 constituting the accommodating space S includes the first lid plate 16, the second lid plate 17, the connecting wall portion 18, the first wall portion 20, and the second wall portion 21. And the first side wall portion 19a and the second side wall portion 19b. Therefore, it can be said that the second lid plate 17 and the connecting wall portion 18 define the accommodation space S.

図６又は図７に示すように、ケース１３は、収容空間Ｓとケース１３の外部とを連通する連通口１７ｂを有するとともに、連通口１７ｂを形成する連通口壁部としての第２蓋板１７を有する。ケース１３において、第２蓋板１７の外面１７ａに対し、接続壁部１８の外面１８ａは直交するように交差している。 As shown in FIG. 6 or 7, the case 13 has a communication port 17b that communicates the accommodation space S with the outside of the case 13, and a second lid plate 17 as a communication port wall portion that forms the communication port 17b. Has. In the case 13, the outer surface 18a of the connecting wall portion 18 intersects the outer surface 17a of the second lid plate 17 so as to be orthogonal to the outer surface 17a.

図４に示すように、シャント抵抗器４０は、例えば、Ｃｕ−Ｍｎ−Ｎｉ系等の抵抗合金から構成される抵抗体４１と、Ｃｕ等の金属から構成される一対の電極端子４２とを有する。抵抗体４１は矩形平板状である。各電極端子４２は矩形平板状である。シャント抵抗器４０は、一方の電極端子４２、抵抗体４１、及び他方の電極端子４２を、電極端子４２の長手へ一列に並べて構成されている。電極端子４２の長手方向は、電極端子４２の六つの側面のうち、最も面積の大きい二つの側面の長手が延びる方向であり、電極端子４２の短手方向は、最も面積の大きい二つの側面の短手が延びる方向である。 As shown in FIG. 4, the shunt resistor 40 has, for example, a resistor 41 made of a resistance alloy such as Cu—Mn—Ni and a pair of electrode terminals 42 made of a metal such as Cu. .. The resistor 41 has a rectangular flat plate shape. Each electrode terminal 42 has a rectangular flat plate shape. The shunt resistor 40 is configured by arranging one electrode terminal 42, a resistor 41, and the other electrode terminal 42 in a line along the length of the electrode terminal 42. The longitudinal direction of the electrode terminal 42 is the direction in which the longitudinal direction of the two side surfaces having the largest area extends from the six side surfaces of the electrode terminal 42, and the lateral direction of the electrode terminal 42 is the direction in which the two side surfaces having the largest area extend. This is the direction in which the short side extends.

シャント抵抗器４０において、一方の電極端子４２、抵抗体４１、及び他方の電極端子４２が一列に並ぶ方向を並設方向Ｆとする。並設方向Ｆは、第２ケース部材１５の第１方向Ｘと一致する。また、シャント抵抗器４０の並設方向Ｆは、電極端子４２の長手方向と一致する。各電極端子４２の短手方向をシャント抵抗器４０の幅方向Ｗとする。幅方向Ｗは、第３方向Ｚと一致する。さらに、電極端子４２の最も面積の大きい二つの側面を繋ぐ方向を、シャント抵抗器４０の厚さ方向Ｄ１とし、厚さ方向Ｄ１は第２方向Ｙと一致する。並設方向Ｆは、シャント抵抗器４０の厚さ方向Ｄ１に交差する一つの方向である。また、幅方向Ｗは、シャント抵抗器４０の厚さ方向Ｄ１及び並設方向Ｆに直交する方向である。 In the shunt resistor 40, the direction in which one electrode terminal 42, the resistor 41, and the other electrode terminal 42 are lined up in a row is defined as the parallel arrangement direction F. The parallel direction F coincides with the first direction X of the second case member 15. Further, the parallel direction F of the shunt resistor 40 coincides with the longitudinal direction of the electrode terminal 42. The lateral direction of each electrode terminal 42 is defined as the width direction W of the shunt resistor 40. The width direction W coincides with the third direction Z. Further, the direction connecting the two side surfaces having the largest area of the electrode terminal 42 is the thickness direction D1 of the shunt resistor 40, and the thickness direction D1 coincides with the second direction Y. The parallel direction F is one direction that intersects the thickness direction D1 of the shunt resistor 40. Further, the width direction W is a direction orthogonal to the thickness direction D1 and the parallel arrangement direction F of the shunt resistor 40.

シャント抵抗器４０は、厚さ方向Ｄ１の両面にシャント主面を有し、シャント抵抗器４０の一対のシャント主面のうち、一方のシャント主面を開放シャント主面４０ｂとし、他方のシャント主面を対向シャント主面４０ｃとする。２つのシャント主面４０ｂ，４０ｃは、シャント抵抗器４０の側面のうち、最も面積の大きい２つの側面である。なお、開放シャント主面４０ｂ及び対向シャント主面４０ｃについては後に詳述する。 The shunt resistor 40 has shunt main surfaces on both sides in the thickness direction D1, and of the pair of shunt main surfaces of the shunt resistor 40, one shunt main surface is an open shunt main surface 40b and the other shunt main surface. The surface is the opposite shunt main surface 40c. The two shunt main surfaces 40b and 40c are the two surfaces having the largest area among the side surfaces of the shunt resistor 40. The open shunt main surface 40b and the facing shunt main surface 40c will be described in detail later.

各電極端子４２は、並設方向Ｆにおける抵抗体４１寄りに透孔４２ａを有する。透孔４２ａは、電極端子４２を厚さ方向Ｄ１に貫通する。また、各電極端子４２は、並設方向Ｆにおける透孔４２ａとは反対側の端部寄りに連結孔４２ｂを有する。連結孔４２ｂは、電極端子４２を厚さ方向Ｄ１に貫通する。図２に示すように、各電極端子４２の連結孔４２ｂには、外部接続部材としてのバスバー６０を貫通させた螺合部材としての接続用ボルト６１が挿通される。 Each electrode terminal 42 has a through hole 42a near the resistor 41 in the parallel direction F. The through hole 42a penetrates the electrode terminal 42 in the thickness direction D1. Further, each electrode terminal 42 has a connecting hole 42b near the end on the side opposite to the through hole 42a in the parallel direction F. The connecting hole 42b penetrates the electrode terminal 42 in the thickness direction D1. As shown in FIG. 2, a connecting bolt 61 as a screwing member through which a bus bar 60 as an external connecting member is penetrated is inserted into the connecting hole 42b of each electrode terminal 42.

回路基板３１は、ガラスエポキシ製の本体部３４を備える。回路基板３１は、本体部３４の厚さ方向Ｄ２の両面に基板主面を有する。回路基板３１の一対の基板主面のうちの一方を対向基板主面３４ｂとし、対向基板主面３４ｂとは別となる他方の基板主面を制御側基板主面３４ａとする。なお、対向基板主面３４ｂについては、後に詳述する。 The circuit board 31 includes a main body 34 made of glass epoxy. The circuit board 31 has substrate main surfaces on both sides of the main body 34 in the thickness direction D2. One of the pair of substrate main surfaces of the circuit board 31 is designated as the facing substrate main surface 34b, and the other substrate main surface different from the facing substrate main surface 34b is designated as the control side substrate main surface 34a. The facing substrate main surface 34b will be described in detail later.

制御側基板主面３４ａには、制御部としての電圧増幅ＩＣ３２が配置されている。電圧増幅ＩＣ３２は半田によって制御側基板主面３４ａに実装されている。電圧増幅ＩＣ３２は、電池パック１０から負荷への電流経路に流れる電流を計測可能な電圧に変換するための集積回路である。 A voltage amplification IC 32 as a control unit is arranged on the main surface 34a of the control side substrate. The voltage amplification IC 32 is mounted on the control side substrate main surface 34a by soldering. The voltage amplification IC 32 is an integrated circuit for converting the current flowing in the current path from the battery pack 10 to the load into a measurable voltage.

対向基板主面３４ｂには、電流検出の配線パターンＰが設けられているとともに、電解コンデンサ３５、その他の電子部品３６が半田付けによって実装されている。対向基板主面３４ｂには接続用コネクタ３７が実装されている。本体部３４の四隅には、孔３３が設けられている。各孔３３には上記した基板取付ねじ２７が挿通されている。 A wiring pattern P for current detection is provided on the main surface 34b of the facing substrate, and an electrolytic capacitor 35 and other electronic components 36 are mounted by soldering. A connector 37 for connection is mounted on the main surface 34b of the facing board. Holes 33 are provided at the four corners of the main body 34. The above-mentioned board mounting screw 27 is inserted into each hole 33.

図４又は図７に示すように、回路基板３１とシャント抵抗器４０とは、二つの接続部材５１によって一体化されている。つまり、シャント抵抗器４０と回路基板３１には、一対の接続部材５１が接続されている。各接続部材５１は、それぞれＬ形の金属製である。本実施形態では接続部材５１は銅製である。各接続部材５１は、シャント抵抗器４０に固定される平板状の抵抗側接続部５３と、回路基板３１に固定される平板状の基板側接続部５２とを有する。 As shown in FIG. 4 or 7, the circuit board 31 and the shunt resistor 40 are integrated by two connecting members 51. That is, a pair of connecting members 51 are connected to the shunt resistor 40 and the circuit board 31. Each connecting member 51 is made of L-shaped metal. In this embodiment, the connecting member 51 is made of copper. Each connecting member 51 has a flat plate-shaped resistance-side connecting portion 53 fixed to the shunt resistor 40 and a flat-plate-shaped substrate-side connecting portion 52 fixed to the circuit board 31.

基板側接続部５２は、回路基板３１の配線パターンＰと締結され、抵抗側接続部５３は、シャント抵抗器４０の電極端子４２と締結される。基板側接続部５２の五つの側面のうち、最も面積の大きい二つの面のうちの一方を外面５２ａとし、他方を内面５２ｂとする。また、抵抗側接続部５３の五つの側面のうち、最も面積の大きい二つの面のうちの一方を外面５３ａとし、他方を内面５３ｂとする。 The board-side connection portion 52 is fastened to the wiring pattern P of the circuit board 31, and the resistance-side connection portion 53 is fastened to the electrode terminal 42 of the shunt resistor 40. Of the five side surfaces of the substrate-side connecting portion 52, one of the two surfaces having the largest area is the outer surface 52a, and the other is the inner surface 52b. Further, of the five side surfaces of the resistance side connecting portion 53, one of the two surfaces having the largest area is designated as the outer surface 53a, and the other is designated as the inner surface 53b.

基板側接続部５２の外面５２ａと抵抗側接続部５３の外面５３ａとは互いに直交するように交差し、基板側接続部５２の内面５２ｂと抵抗側接続部５３の内面５３ｂとは互いに直交するように交差する。したがって、基板側接続部５２と抵抗側接続部５３は直交するように交差している。本実施形態では、並設方向Ｆの外側から接続部材５１を見た側面視では、接続部材５１はＬ形である。 The outer surface 52a of the board-side connection portion 52 and the outer surface 53a of the resistance-side connection portion 53 intersect with each other so as to be orthogonal to each other, and the inner surface 52b of the board-side connection portion 52 and the inner surface 53b of the resistance-side connection portion 53 are orthogonal to each other. Cross to. Therefore, the substrate-side connecting portion 52 and the resistance-side connecting portion 53 intersect so as to be orthogonal to each other. In the present embodiment, the connecting member 51 is L-shaped when viewed from the outside in the parallel direction F.

各接続部材５１は、基板側接続部５２の外面５２ａと抵抗側接続部５３の外面５３ａとが交わる位置に第１交差線Ｎ１を有する。第１交差線Ｎ１は、接続部材５１の外面側の角上に位置する。また、各接続部材５１は、基板側接続部５２の内面５２ｂと抵抗側接続部５３の内面５３ｂとが交わる位置に第２交差線Ｎ２を有する。第２交差線Ｎ２は、接続部材５１の内面側の角上に位置する。第１交差線Ｎ１は、外面５２ａ，５３ａの短手方向に延びる直線であり、第２交差線Ｎ２は、内面５２ｂ，５３ｂの短手方向に延びる直線である。 Each connecting member 51 has a first crossing line N1 at a position where the outer surface 52a of the substrate-side connecting portion 52 and the outer surface 53a of the resistance-side connecting portion 53 intersect. The first crossing line N1 is located on the outer surface side corner of the connecting member 51. Further, each connecting member 51 has a second crossing line N2 at a position where the inner surface 52b of the substrate side connecting portion 52 and the inner surface 53b of the resistance side connecting portion 53 intersect. The second crossing line N2 is located on the inner surface side corner of the connecting member 51. The first crossing line N1 is a straight line extending in the lateral direction of the outer surfaces 52a and 53a, and the second crossing line N2 is a straight line extending in the lateral direction of the inner surfaces 52b and 53b.

図２、図６又は図７に示すように、基板側接続部５２は、基板用リベット６４によって回路基板３１の配線パターンＰに締結され、抵抗側接続部５３は、抵抗用リベット６５によって弾性部材４８を介してシャント抵抗器４０の電極端子４２に締結されている。各接続部材５１において、基板側接続部５２の外面５２ａは、回路基板３１の対向基板主面３４ｂに設けられた配線パターンＰに接触している。また、抵抗側接続部５３の外面５３ａは、弾性部材４８を介して各電極端子４２の対向シャント主面４０ｃに接触している。 As shown in FIGS. 2, 6 or 7, the substrate side connection portion 52 is fastened to the wiring pattern P of the circuit board 31 by the substrate rivet 64, and the resistance side connection portion 53 is an elastic member by the resistance rivet 65. It is fastened to the electrode terminal 42 of the shunt resistor 40 via 48. In each connecting member 51, the outer surface 52a of the substrate-side connecting portion 52 is in contact with the wiring pattern P provided on the opposing substrate main surface 34b of the circuit board 31. Further, the outer surface 53a of the resistance side connecting portion 53 is in contact with the opposing shunt main surface 40c of each electrode terminal 42 via the elastic member 48.

また、シャント抵抗器４０において、開放シャント主面４０ｂ及び対向シャント主面４０ｃの延長面Ｔ１と、回路基板３１の制御側基板主面３４ａ及び対向基板主面３４ｂの延長面Ｔ２とは、互いに交差しており、本実施形態では直交している。つまり、シャント抵抗器４０を並設方向Ｆに沿って見た側面視、及び開放シャント主面４０ｂ側から見た平面視において、シャント抵抗器４０は回路基板３１の対向基板主面３４ｂから幅方向Ｗに突出するように回路基板３１から立設されている。 Further, in the shunt resistor 40, the extension surface T1 of the open shunt main surface 40b and the opposite shunt main surface 40c and the extension surface T2 of the control side substrate main surface 34a and the opposite substrate main surface 34b of the circuit board 31 intersect with each other. In this embodiment, they are orthogonal to each other. That is, in the side view of the shunt resistor 40 along the parallel direction F and the plan view of the open shunt main surface 40b side, the shunt resistor 40 is in the width direction from the opposite substrate main surface 34b of the circuit board 31. It is erected from the circuit board 31 so as to project to W.

電流計測装置５０において、基板用リベット６４により、基板側接続部５２と回路基板３１は互いに重なる状態で挟持されている。基板用リベット６４による挟持により、基板側接続部５２と配線パターンＰとが密接している。この密接により配線パターンＰと接続部材５１とが信号接続されている。 In the current measuring device 50, the substrate side connection portion 52 and the circuit board 31 are sandwiched by the substrate rivet 64 in a state of overlapping each other. Due to the sandwiching by the board rivet 64, the board side connection portion 52 and the wiring pattern P are in close contact with each other. Due to this close contact, the wiring pattern P and the connecting member 51 are signal-connected.

シャント抵抗器４０は、開放シャント主面４０ｂと対向シャント主面４０ｃを厚さ方向Ｄ１に繋ぐ側端面のうち、幅方向Ｗの一端縁に位置する側端面に基板側端面４０ｇを有する。基板側端面４０ｇは、並設方向Ｆに延びる一対の側端面のうち、回路基板３１に近い側端面である。 The shunt resistor 40 has a substrate side end surface 40g on a side end surface located at one end edge in the width direction W among the side end surfaces connecting the open shunt main surface 40b and the facing shunt main surface 40c in the thickness direction D1. The substrate side end face 40g is a side end face close to the circuit board 31 among a pair of side end faces extending in the parallel direction F.

シャント抵抗器４０は、接続部材５１の抵抗側接続部５３の外面５３ａに配置されているが、抵抗側接続部５３の長手方向において、基板側端面４０ｇが第２交差線Ｎ２よりも抵抗側接続部５３の先端寄りに位置するように配置されている。より具体的には、シャント抵抗器４０を開放シャント主面４０ｂ側から見た平面視において、シャント抵抗器４０は、基板側端面４０ｇが基板側接続部５２の内面５２ｂよりも、抵抗側接続部５３の先端寄りに位置するように配置されている。したがって、シャント抵抗器４０を外側となる開放シャント主面４０ｂ側から見た平面視において、シャント抵抗器４０は、回路基板３１に重なっていない。さらに、平面視において、シャント抵抗器４０は、回路基板３１の対向基板主面３４ｂから離間している。 The shunt resistor 40 is arranged on the outer surface 53a of the resistance side connection portion 53 of the connection member 51, but in the longitudinal direction of the resistance side connection portion 53, the substrate side end surface 40g is connected to the resistance side with respect to the second crossing line N2. It is arranged so as to be located near the tip of the portion 53. More specifically, when the shunt resistor 40 is viewed from the open shunt main surface 40b side in a plan view, the substrate side end surface 40g of the shunt resistor 40 is a resistance side connection portion rather than the inner surface 52b of the substrate side connection portion 52. It is arranged so as to be located near the tip of 53. Therefore, the shunt resistor 40 does not overlap the circuit board 31 in a plan view when the shunt resistor 40 is viewed from the open shunt main surface 40b side which is the outside. Further, in a plan view, the shunt resistor 40 is separated from the facing substrate main surface 34b of the circuit board 31.

電流計測装置５０において、抵抗用リベット６５により、抵抗側接続部５３と、電極端子４２とが挟持されている。抵抗用リベット６５による挟持により、電極端子４２と抵抗側接続部５３と弾性部材４８とが密接している。なお、弾性部材４８は、電極端子４２の対向シャント主面４０ｃと、抵抗側接続部５３の外面５３ａとの間に配置されるとともに、対向シャント主面４０ｃと外面５３ａによって重合方向に挟持されている。また、各弾性部材４８は、抵抗用リベット６５によるかしめによって、重合方向に圧縮されている。 In the current measuring device 50, the resistance side connection portion 53 and the electrode terminal 42 are sandwiched by the resistance rivet 65. Due to the sandwiching by the resistance rivet 65, the electrode terminal 42, the resistance side connection portion 53, and the elastic member 48 are in close contact with each other. The elastic member 48 is arranged between the facing shunt main surface 40c of the electrode terminal 42 and the outer surface 53a of the resistance side connecting portion 53, and is sandwiched between the facing shunt main surface 40c and the outer surface 53a in the polymerization direction. There is. Further, each elastic member 48 is compressed in the polymerization direction by caulking with the resistance rivet 65.

弾性部材４８は、例えばシリコンシートによってリング状に形成されている。シャント抵抗器４０に電流が流れているときの発熱に耐え得るため、弾性部材４８の耐熱温度は１５０〜１７０度に設定されるのが好ましい。また、弾性部材４８は、シャント抵抗器４０に生じた熱を回路基板３１に伝えにくくするために、電極端子４２に比べて熱抵抗が高く設定されるのが好ましい。 The elastic member 48 is formed in a ring shape by, for example, a silicon sheet. The heat resistant temperature of the elastic member 48 is preferably set to 150 to 170 degrees in order to withstand heat generation when a current is flowing through the shunt resistor 40. Further, the elastic member 48 is preferably set to have a higher thermal resistance than the electrode terminal 42 in order to make it difficult to transfer the heat generated in the shunt resistor 40 to the circuit board 31.

各抵抗用リベット６５は、電極端子４２の開放シャント主面４０ｂと電気的に接続されるとともに、抵抗側接続部５３の内面５３ｂと電気的に接続されている。したがって、各電極端子４２は、抵抗用リベット６５を介して接続部材５１と電気的に接続されている。そして、接続部材５１の基板側接続部５２は、回路基板３１の配線パターンＰと電気的に接続され、配線パターンＰは電圧増幅ＩＣ３２と電気的に接続されている。これにより、電圧増幅ＩＣ３２は、抵抗体４１の一対の電極端子４２の電圧を図示しないマイコンで計測可能な電圧に増幅し、マイコンは増幅された電圧に基づいて、電流経路を流れる電流を計測する。 Each resistor rivet 65 is electrically connected to the open shunt main surface 40b of the electrode terminal 42, and is also electrically connected to the inner surface 53b of the resistor side connection portion 53. Therefore, each electrode terminal 42 is electrically connected to the connecting member 51 via the resistance rivet 65. The board-side connecting portion 52 of the connecting member 51 is electrically connected to the wiring pattern P of the circuit board 31, and the wiring pattern P is electrically connected to the voltage amplification IC 32. As a result, the voltage amplification IC 32 amplifies the voltage of the pair of electrode terminals 42 of the resistor 41 to a voltage that can be measured by a microcomputer (not shown), and the microcomputer measures the current flowing through the current path based on the amplified voltage. ..

電流計測装置５０において、回路基板３１は、ケース１３の収容空間Ｓに収容されている。制御側基板主面３４ａは、第３方向Ｚにおいて、第１ケース部材１４の底板１４ａに対向している。回路基板３１の対向基板主面３４ｂは、第３方向Ｚにおいて、第２ケース部材１５の第１蓋板１６に対向している。 In the current measuring device 50, the circuit board 31 is accommodated in the accommodating space S of the case 13. The control-side substrate main surface 34a faces the bottom plate 14a of the first case member 14 in the third direction Z. The facing board main surface 34b of the circuit board 31 faces the first lid plate 16 of the second case member 15 in the third direction Z.

また、各接続部材５１の基板側接続部５２は、収容空間Ｓに配置されている。接続部材５１の抵抗側接続部５３は、連通口１７ｂを通じてケース１３の外部に突出している。ケース１３の外部に突出する抵抗側接続部５３にシャント抵抗器４０が接続されているため、シャント抵抗器４０は、ケース１３の外部に配置されている。 Further, the substrate-side connecting portion 52 of each connecting member 51 is arranged in the accommodation space S. The resistance-side connecting portion 53 of the connecting member 51 projects to the outside of the case 13 through the communication port 17b. Since the shunt resistor 40 is connected to the resistance side connecting portion 53 projecting to the outside of the case 13, the shunt resistor 40 is arranged outside the case 13.

図５又は図６に示すように、ケース１３の外部に配置されたシャント抵抗器４０は、対向シャント主面４０ｃが接続壁部１８の外面１８ａに対向し、開放シャント主面４０ｂはケース１３に覆われることなく、ケース１３の外部に露出している。また、接続壁部１８のリベット収容部１８ｄには、抵抗用リベット６５における接続壁部１８寄りの端部が収容されている。そして、各接続部材５１の抵抗側接続部５３の内面５３ｂが、接続壁部１８の外面１８ａに支持され、シャント抵抗器４０は、接続部材５１を介して接続壁部１８に支持されている。また、対向シャント主面４０ｃと接続壁部１８の外面１８ａとの間には、抵抗側接続部５３が介在している。このため、対向シャント主面４０ｃは、接続壁部１８の外面１８ａから第２方向Ｙに離間している。 As shown in FIG. 5 or 6, in the shunt resistor 40 arranged outside the case 13, the facing shunt main surface 40c faces the outer surface 18a of the connecting wall portion 18, and the open shunt main surface 40b is on the case 13. It is exposed to the outside of the case 13 without being covered. Further, the rivet accommodating portion 18d of the connecting wall portion 18 accommodates an end portion of the resistance rivet 65 near the connecting wall portion 18. Then, the inner surface 53b of the resistance side connecting portion 53 of each connecting member 51 is supported by the outer surface 18a of the connecting wall portion 18, and the shunt resistor 40 is supported by the connecting wall portion 18 via the connecting member 51. Further, a resistance side connecting portion 53 is interposed between the main surface 40c of the facing shunt and the outer surface 18a of the connecting wall portion 18. Therefore, the facing shunt main surface 40c is separated from the outer surface 18a of the connecting wall portion 18 in the second direction Y.

また、図３又は図６に示すように、シャント抵抗器４０の開放シャント主面４０ｂのうち、抵抗体４１及び両電極端子４２の抵抗体４１寄りの部位は、被覆壁部２３によって覆われている。被覆壁部２３の被覆面２３ｂは、開放シャント主面４０ｂのうち、抵抗体４１を覆うとともに、両電極端子４２の抵抗体４１寄りの端部を被覆している。なお、シャント抵抗器４０の開放シャント主面４０ｂと、被覆壁部２３の被覆面２３ｂとの間には、抵抗用リベット６５の端部が介在している。このため、開放シャント主面４０ｂのうち、被覆壁部２３に覆われた部分は、被覆壁部２３の被覆面２３ｂから第２方向Ｙに離間している。また、被覆壁部２３は、各電極端子４２と接続部材５１の抵抗側接続部５３との接続部である抵抗用リベット６５の開放シャント主面４０ｂ寄りの端部を覆っている。 Further, as shown in FIG. 3 or FIG. 6, of the open shunt main surface 40b of the shunt resistor 40, the portion of the resistor 41 and both electrode terminals 42 near the resistor 41 is covered with the covering wall portion 23. There is. The covering surface 23b of the covering wall portion 23 covers the resistor 41 of the open shunt main surface 40b, and also covers the ends of both electrode terminals 42 near the resistor 41. An end portion of the resistance rivet 65 is interposed between the open shunt main surface 40b of the shunt resistor 40 and the covering surface 23b of the covering wall portion 23. Therefore, of the open shunt main surface 40b, the portion covered by the covering wall portion 23 is separated from the covering surface 23b of the covering wall portion 23 in the second direction Y. Further, the covering wall portion 23 covers the end portion of the resistance rivet 65, which is the connection portion between each electrode terminal 42 and the resistance side connection portion 53 of the connection member 51, near the open shunt main surface 40b.

シャント抵抗器４０の基板側端面４０ｇは、連通口１７ｂの開口に面している。シャント抵抗器４０の基板側端面４０ｇは、第２蓋板１７の外面１７ａ、及び連通口１７ｂの開口を通過する仮想面Ｃと面一又は仮想面Ｃよりも連通口１７ｂに入り込み、連通口１７ｂ内に位置している。シャント抵抗器４０の基板側端面４０ｇは、連通口１７ｂの多くを第２蓋板１７の外面１７ａ側から閉塞している。 The substrate-side end surface 40 g of the shunt resistor 40 faces the opening of the communication port 17b. The substrate-side end surface 40g of the shunt resistor 40 enters the communication port 17b flush with the virtual surface C passing through the outer surface 17a of the second lid plate 17 and the opening of the communication port 17b, or enters the communication port 17b rather than the virtual surface C, and enters the communication port 17b. Located inside. Most of the communication ports 17b of the shunt resistor 40 on the substrate side end surface 40g are closed from the outer surface 17a side of the second lid plate 17.

図６に示すように、回路基板３１の対向基板主面３４ｂと、シャント抵抗器４０の対向シャント主面４０ｃとを最短かつ直線的に結ぶ仮想線を仮想直線Ｍとする。具体的には、仮想直線Ｍは、対向基板主面３４ｂの第２方向Ｙにおけるシャント抵抗器４０側の一端と、対向シャント主面４０ｃの第３方向Ｚにおける回路基板３１側の一端とを結んでいる。上記したように、第２壁部２１を並設方向Ｆに沿って見た側面視では、シャント抵抗器４０と回路基板３１は直交するように交差している。このため、シャント抵抗器４０の一対のシャント主面のうちの対向シャント主面４０ｃは、回路基板３１の対向基板主面３４ｂと最短の仮想直線Ｍで結ぶことのできる一方のシャント主面である。換言すれば、対向シャント主面４０ｃは、回路基板３１に近いシャント主面である。そして、シャント抵抗器４０の開放シャント主面４０ｂは、シャント抵抗器４０の一対のシャント主面のうちの他方の主面である。 As shown in FIG. 6, the virtual line M connecting the main surface 34b of the opposite board of the circuit board 31 and the main surface 40c of the opposite shunt of the shunt resistor 40 in the shortest and linear manner is defined as a virtual straight line M. Specifically, the virtual straight line M connects one end of the facing substrate main surface 34b on the shunt resistor 40 side in the second direction Y and one end of the facing shunt main surface 40c on the circuit board 31 side in the third direction Z. I'm out. As described above, in the side view of the second wall portion 21 viewed along the parallel direction F, the shunt resistor 40 and the circuit board 31 intersect so as to be orthogonal to each other. Therefore, the opposed shunt main surface 40c of the pair of shunt main surfaces of the shunt resistor 40 is one of the shunt main surfaces that can be connected to the opposed substrate main surface 34b of the circuit board 31 by the shortest virtual straight line M. .. In other words, the opposed shunt main surface 40c is a shunt main surface close to the circuit board 31. The open shunt main surface 40b of the shunt resistor 40 is the other main surface of the pair of shunt main surfaces of the shunt resistor 40.

また、回路基板３１において、シャント抵抗器４０の対向シャント主面４０ｃと最短の仮想直線Ｍで結ぶことのできる一方の基板主面は対向基板主面３４ｂであり、他方の基板主面は制御側基板主面３４ａである。換言すれば、対向基板主面３４ｂは、シャント抵抗器４０に近い基板主面である。 Further, in the circuit board 31, one board main surface that can be connected to the facing shunt main surface 40c of the shunt resistor 40 by the shortest virtual straight line M is the facing board main surface 34b, and the other board main surface is the control side. It is a substrate main surface 34a. In other words, the facing substrate main surface 34b is a substrate main surface close to the shunt resistor 40.

電流計測装置５０において、接続壁部１８は、シャント抵抗器４０の対向シャント主面４０ｃと収容空間Ｓとの間に介在している。このため、シャント抵抗器４０の対向シャント主面４０ｃは、接続壁部１８によって収容空間Ｓと隔てられている。そして、シャント抵抗器４０の対向シャント主面４０ｃは、接続壁部１８に対向する。このため、ケース１３の第２ケース部材１５は、シャント抵抗器４０の対向シャント主面４０ｃと対向する対向壁部を有し、本実施形態では、接続壁部１８が対向壁部として機能する。そして、接続壁部１８は、シャント抵抗器４０の対向シャント主面４０ｃと収容空間Ｓとの間に介在する。 In the current measuring device 50, the connecting wall portion 18 is interposed between the facing shunt main surface 40c of the shunt resistor 40 and the accommodation space S. Therefore, the facing shunt main surface 40c of the shunt resistor 40 is separated from the accommodation space S by the connecting wall portion 18. The facing shunt main surface 40c of the shunt resistor 40 faces the connecting wall portion 18. Therefore, the second case member 15 of the case 13 has a facing wall portion facing the facing shunt main surface 40c of the shunt resistor 40, and in the present embodiment, the connecting wall portion 18 functions as the facing wall portion. The connection wall portion 18 is interposed between the facing shunt main surface 40c of the shunt resistor 40 and the accommodation space S.

図７に示すように、シャント抵抗器４０の連結孔４２ｂは、接続壁部１８のナット受部１８ｃに支持されたナット６３に重合する位置にある。そして、シャント抵抗器４０の各電極端子４２の開放シャント主面４０ｂにはバスバー６０が配置されるとともに、バスバー６０を貫通した接続用ボルト６１が、連結孔４２ｂを貫通してナット６３に螺合される。接続用ボルト６１とナット６３の螺合により、各電極端子４２にはバスバー６０が締結されるとともに、各電極端子４２にはバスバー６０が電気的に接続される。各電極端子４２と電気的に接続されたバスバー６０は、電池パック１０と負荷とを接続する電流経路に接続されている。したがって、バスバー６０は、電池パック１０と負荷とを接続する電流経路の一部を構成しているといえる。 As shown in FIG. 7, the connecting hole 42b of the shunt resistor 40 is located at a position where it overlaps with the nut 63 supported by the nut receiving portion 18c of the connecting wall portion 18. A bus bar 60 is arranged on the open shunt main surface 40b of each electrode terminal 42 of the shunt resistor 40, and a connection bolt 61 penetrating the bus bar 60 penetrates the connecting hole 42b and is screwed into the nut 63. Will be done. By screwing the connecting bolt 61 and the nut 63, the bus bar 60 is fastened to each electrode terminal 42, and the bus bar 60 is electrically connected to each electrode terminal 42. The bus bar 60 electrically connected to each electrode terminal 42 is connected to a current path connecting the battery pack 10 and the load. Therefore, it can be said that the bus bar 60 constitutes a part of the current path connecting the battery pack 10 and the load.

次に、電流計測装置５０の作用を説明する。
電池パック１０から負荷への電流経路に流れている電流が、一方の電極端子４２から抵抗体４１に流れ、他方の電極端子４２へ流れる。抵抗体４１を電流が流れることによって生じる電圧が、抵抗用リベット６５、接続部材５１、及び配線パターンＰを介して電圧増幅ＩＣ３２に入力される。電圧増幅ＩＣ３２は、入力された電圧を増幅し、図示しないマイコンは増幅された電圧値に基づいて電流値を計測する。 Next, the operation of the current measuring device 50 will be described.
The current flowing in the current path from the battery pack 10 to the load flows from one electrode terminal 42 to the resistor 41 and then to the other electrode terminal 42. The voltage generated by the current flowing through the resistor 41 is input to the voltage amplification IC 32 via the resistor rivet 65, the connecting member 51, and the wiring pattern P. The voltage amplification IC 32 amplifies the input voltage, and a microcomputer (not shown) measures the current value based on the amplified voltage value.

シャント抵抗器４０に電流が流れると、シャント抵抗器４０が発熱する。シャント抵抗器４０で発生した熱は、シャント抵抗器４０の側面のうち、面積の大きい開放シャント主面４０ｂ及び対向シャント主面４０ｃから主に放出される。シャント抵抗器４０の開放シャント主面４０ｂから放出される熱は、ケース１３の外部に向けて放出される。対向シャント主面４０ｃからの熱の放出先には、接続壁部１８が対向するため、対向シャント主面４０ｃから放出された熱は接続壁部１８に伝わる。このため、接続壁部１８によってケース１３の外部と隔てられた収容空間Ｓには、シャント抵抗器４０で発生した熱が及びにくく、収容空間Ｓに収容された回路基板３１には熱が及びにくい。 When a current flows through the shunt resistor 40, the shunt resistor 40 generates heat. The heat generated by the shunt resistor 40 is mainly released from the open shunt main surface 40b and the opposite shunt main surface 40c, which have a large area, among the side surfaces of the shunt resistor 40. The heat released from the open shunt main surface 40b of the shunt resistor 40 is released toward the outside of the case 13. Since the connecting wall portion 18 faces the heat discharge destination from the facing shunt main surface 40c, the heat released from the facing shunt main surface 40c is transmitted to the connecting wall portion 18. Therefore, the heat generated by the shunt resistor 40 is hard to reach the accommodation space S separated from the outside of the case 13 by the connection wall portion 18, and the heat is hard to reach the circuit board 31 housed in the accommodation space S. ..

上記実施形態によれば、以下のような効果を得ることができる。
（１）シャント抵抗器４０で発生した熱は、開放シャント主面４０ｂからケース１３の外部に放出されるため、シャント抵抗器４０が収容空間Ｓに収容されてシャント抵抗器４０の両シャント主面がケース１３に覆われている場合と比べると、シャント抵抗器４０の放熱性を高めることができる。また、開放シャント主面４０ｂからの放熱があるため、対向シャント主面４０ｃからの放熱量が抑えられ、さらに、対向シャント主面４０ｃから放出された熱は接続壁部１８に伝わる。このため、シャント抵抗器４０で発生した熱が回路基板３１に及びにくくなる。その結果、回路基板３１に実装された電解コンデンサ３５及び電子部品３６にも熱が及びにくくなり、電解コンデンサ３５及び電子部品３６への熱影響を抑えることができるとともに、電解コンデンサ３５及び電子部品３６を実装するための半田への熱影響も抑えることができる。 According to the above embodiment, the following effects can be obtained.
(1) Since the heat generated by the shunt resistor 40 is released from the open shunt main surface 40b to the outside of the case 13, the shunt resistor 40 is accommodated in the accommodation space S and both shunt main surfaces of the shunt resistor 40 are accommodated. The heat dissipation of the shunt resistor 40 can be improved as compared with the case where the shunt resistor 40 is covered with the case 13. Further, since the heat is dissipated from the open shunt main surface 40b, the amount of heat dissipated from the facing shunt main surface 40c is suppressed, and the heat released from the facing shunt main surface 40c is transferred to the connecting wall portion 18. Therefore, the heat generated by the shunt resistor 40 is less likely to reach the circuit board 31. As a result, heat is less likely to reach the electrolytic capacitor 35 and the electronic component 36 mounted on the circuit board 31, the thermal influence on the electrolytic capacitor 35 and the electronic component 36 can be suppressed, and the electrolytic capacitor 35 and the electronic component 36 can be suppressed. It is also possible to suppress the thermal effect on the solder for mounting.

（２）シャント抵抗器４０の基板側端面４０ｇは、ケース１３の連通口１７ｂに面し、具体的には、連通口１７ｂの開口を通過する仮想面Ｃと面一、又は連通口１７ｂに入り込んでいる。このため、連通口１７ｂの多くをシャント抵抗器４０で塞ぐことができ、連通口１７ｂから収容空間Ｓへの異物の侵入を抑制できる。 (2) The substrate-side end surface 40 g of the shunt resistor 40 faces the communication port 17b of the case 13, and specifically, enters the communication port 17b flush with the virtual surface C passing through the opening of the communication port 17b. I'm out. Therefore, most of the communication port 17b can be closed by the shunt resistor 40, and the invasion of foreign matter from the communication port 17b into the accommodation space S can be suppressed.

（３）接続部材５１を介してシャント抵抗器４０と回路基板３１とを一体化して接続している。このため、シャント抵抗器４０で発生した熱は、接続部材５１を介して回路基板３１に伝わるが、回路基板３１とは別体の接続部材５１を介するため、回路基板３１に対する伝熱を抑制できる。 (3) The shunt resistor 40 and the circuit board 31 are integrally connected via a connecting member 51. Therefore, the heat generated by the shunt resistor 40 is transferred to the circuit board 31 via the connecting member 51, but since it is transmitted through the connecting member 51 which is separate from the circuit board 31, heat transfer to the circuit board 31 can be suppressed. ..

（４）一対の接続部材５１において、基板側接続部５２は、回路基板３１の対向基板主面３４ｂに接続され、抵抗側接続部５３は、シャント抵抗器４０の対向シャント主面４０ｃに接続されている。このため、シャント抵抗器４０及び回路基板３１が接続部材５１によって一体化される構成において、例えば、基板側接続部５２が制御側基板主面３４ａに接続され、抵抗側接続部５３が開放シャント主面４０ｂに接続される場合と比べて、シャント抵抗器４０と回路基板３１を離すことができる。その結果、シャント抵抗器４０から回路基板３１へ熱を及びにくくできる。 (4) In the pair of connecting members 51, the substrate side connecting portion 52 is connected to the opposing substrate main surface 34b of the circuit board 31, and the resistance side connecting portion 53 is connected to the opposing shunt main surface 40c of the shunt resistor 40. ing. Therefore, in a configuration in which the shunt resistor 40 and the circuit board 31 are integrated by the connecting member 51, for example, the substrate side connecting portion 52 is connected to the control side substrate main surface 34a, and the resistance side connecting portion 53 is an open shunt main. The shunt resistor 40 and the circuit board 31 can be separated from each other as compared with the case where the surface 40b is connected. As a result, it is possible to prevent heat from being transferred from the shunt resistor 40 to the circuit board 31.

（５）ケース１３は、接続壁部１８にナット受部１８ｃを備え、ナット受部１８ｃにはナット６３が支持されている。このため、電極端子４２にバスバー６０を締結する際、電極端子４２の連結孔４２ｂに挿通された接続用ボルト６１をナット６３に螺合しやすい。例えば、対向シャント主面４０ｃ側において電極端子４２の連結孔４２ｂに重合する位置にナット６３を手で支持しながら接続用ボルト６１をナット６３に螺合する場合と比べて、ナット６３に対し接続用ボルト６１を螺合しやすい。 (5) The case 13 includes a nut receiving portion 18c on the connecting wall portion 18, and a nut 63 is supported on the nut receiving portion 18c. Therefore, when the bus bar 60 is fastened to the electrode terminal 42, the connection bolt 61 inserted into the connecting hole 42b of the electrode terminal 42 is easily screwed into the nut 63. For example, the connection bolt 61 is connected to the nut 63 as compared with the case where the connection bolt 61 is screwed into the nut 63 while the nut 63 is manually supported at the position where the electrode terminal 42 is overlapped with the connection hole 42b on the main surface 40c side of the facing shunt. It is easy to screw the bolt 61.

（６）接続壁部１８の外面１８ａには、接続部材５１の抵抗側接続部５３を介してシャント抵抗器４０が支持されている。このため、シャント抵抗器４０を安定した状態に支持でき、振動等によってシャント抵抗器４０が振動することを抑制できる。 (6) A shunt resistor 40 is supported on the outer surface 18a of the connection wall portion 18 via the resistance side connection portion 53 of the connection member 51. Therefore, the shunt resistor 40 can be supported in a stable state, and vibration of the shunt resistor 40 due to vibration or the like can be suppressed.

（７）抵抗体４１は被覆壁部２３によって覆われている。このため、被覆壁部２３により、抵抗体４１に異物が付着しにくくなる。その結果、抵抗体４１への異物付着による抵抗体４１の抵抗変動に伴って生じる、電流計測の誤差を抑制できる。 (7) The resistor 41 is covered with a covering wall portion 23. Therefore, the covering wall portion 23 makes it difficult for foreign matter to adhere to the resistor 41. As a result, it is possible to suppress the error of current measurement caused by the resistance fluctuation of the resistor 41 due to the adhesion of foreign matter to the resistor 41.

（８）シャント抵抗器４０と回路基板３１は二つの接続部材５１によって接続され、側面視Ｌ形に形成されている。そして、接続部材５１に対するシャント抵抗器４０及び回路基板３１の配置を調節することで、シャント抵抗器４０と回路基板３１の電気的な絶縁に関する沿面距離及び空間距離を確保できる。 (8) The shunt resistor 40 and the circuit board 31 are connected by two connecting members 51 and are formed in an L shape in a side view. Then, by adjusting the arrangement of the shunt resistor 40 and the circuit board 31 with respect to the connecting member 51, it is possible to secure the creepage distance and the space distance regarding the electrical insulation of the shunt resistor 40 and the circuit board 31.

（９）接続部材５１とシャント抵抗器４０とは抵抗用リベット６５によって機械的に締結され、接続部材５１と回路基板３１とは基板用リベット６４によって機械的に締結されている。このため、シャント抵抗器４０と回路基板３１とを半田接続する場合のような、熱影響によって半田にクラックが生じることを無くすことができる。 (9) The connecting member 51 and the shunt resistor 40 are mechanically fastened by the resistance rivet 65, and the connecting member 51 and the circuit board 31 are mechanically fastened by the board rivet 64. Therefore, it is possible to eliminate cracks in the solder due to the influence of heat as in the case where the shunt resistor 40 and the circuit board 31 are solder-connected.

（１０）ケース１３は絶縁リブ２４を有し、この絶縁リブ２４により、ケース１３の外部に配置されたシャント抵抗器４０を第１ケース部材１４から絶縁でき、第２ケース部材１５が高電位になることを抑制できる。 (10) The case 13 has an insulating rib 24, and the insulating rib 24 can insulate the shunt resistor 40 arranged outside the case 13 from the first case member 14, and the second case member 15 has a high potential. It can be suppressed.

（１１）シャント抵抗器４０の開放シャント主面４０ｂにおいて、電極端子４２にはバスバー６０が締結される。このため、シャント抵抗器４０で発生した熱は、開放シャント主面４０ｂに加え、バスバー６０からも放出され、シャント抵抗器４０の放熱性を高めることができる。 (11) A bus bar 60 is fastened to the electrode terminal 42 on the open shunt main surface 40b of the shunt resistor 40. Therefore, the heat generated by the shunt resistor 40 is released from the bus bar 60 in addition to the open shunt main surface 40b, and the heat dissipation of the shunt resistor 40 can be improved.

（１２）電流計測装置５０において、シャント抵抗器４０は、ケース１３における収容空間Ｓを画成する壁部の一つである接続壁部１８に支持され、第２ケース部材１５を第１蓋板１６の外面１６ａ側から見た正面視において、接続壁部１８はケース１３の外形内に位置している。このため、例えば、ケース１３の第１壁部２０の外面２０ａから突出した台座にシャント抵抗器４０を載置する場合と比べると、ケース１３を小型化し、電流計測装置５０を小型化できる。 (12) In the current measuring device 50, the shunt resistor 40 is supported by a connecting wall portion 18 which is one of the wall portions defining the accommodation space S in the case 13, and the second case member 15 is attached to the first lid plate. The connection wall portion 18 is located inside the outer shape of the case 13 when viewed from the outer surface 16a side of the 16. Therefore, for example, as compared with the case where the shunt resistor 40 is mounted on the pedestal protruding from the outer surface 20a of the first wall portion 20 of the case 13, the case 13 can be miniaturized and the current measuring device 50 can be miniaturized.

本実施形態は、以下のように変更して実施することができる。本実施形態及び以下の変更例は、技術的に矛盾しない範囲で互いに組み合わせて実施することができる。
○ 被覆壁部２３は無くてもよい。 This embodiment can be modified and implemented as follows. The present embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.
○ The covering wall portion 23 may be omitted.

○ 被覆壁部２３の補強リブ２５は無くてもよい。
○ 被覆壁部２３は、抵抗体４１のみを覆っていてもよい。
○ 接続壁部１８に、接続部材５１の抵抗側接続部５３を収容する収容凹部を形成し、収容凹部に抵抗側接続部５３を収容して、接続壁部１８の外面１８ａにシャント抵抗器４０の対向シャント主面４０ｃを直接支持させてもよい。 ○ The reinforcing rib 25 of the covering wall portion 23 may not be provided.
○ The covering wall portion 23 may cover only the resistor 41.
○ A storage recess for accommodating the resistance side connection portion 53 of the connection member 51 is formed in the connection wall portion 18, the resistance side connection portion 53 is accommodated in the accommodation recess, and the shunt resistor 40 is provided on the outer surface 18a of the connection wall portion 18. The main surface 40c of the opposite shunt may be directly supported.

○ 接続壁部１８の外面１８ａと、接続部材５１における抵抗側接続部５３の内面５３ｂとを第２方向Ｙに離間させ、接続壁部１８にシャント抵抗器４０を支持しなくてもよい。 ○ It is not necessary to support the shunt resistor 40 on the connection wall portion 18 by separating the outer surface 18a of the connection wall portion 18 and the inner surface 53b of the resistance side connection portion 53 of the connection member 51 in the second direction Y.

○ 接続壁部１８のナット受部１８ｃ及びナット６３は無くてもよい。
○ 電流計測装置５０の平面視及び正面視において、シャント抵抗器４０と回路基板３１が重ならなければ、シャント抵抗器４０は、抵抗側接続部５３の外面５３ａ及び内面５３ｂのいずれに配置されてもよいし、回路基板３１も、基板側接続部５２の外面５２ａ及び内面５２ｂのいずれに配置されてもよい。 ○ The nut receiving portion 18c and the nut 63 of the connecting wall portion 18 may be omitted.
○ If the shunt resistor 40 and the circuit board 31 do not overlap in the plan view and the front view of the current measuring device 50, the shunt resistor 40 is arranged on either the outer surface 53a or the inner surface 53b of the resistance side connection portion 53. Alternatively, the circuit board 31 may be arranged on either the outer surface 52a or the inner surface 52b of the substrate side connection portion 52.

○ 電流計測装置５０の平面視及び正面視において、シャント抵抗器４０と回路基板３１が重ならなければ、接続部材５１の基板側接続部５２は、回路基板３１の制御側基板主面３４ａ及び対向基板主面３４ｂに跨がる状態で本体部３４に取り付けられていてもよい。 ○ If the shunt resistor 40 and the circuit board 31 do not overlap in the plan view and the front view of the current measuring device 50, the board side connecting portion 52 of the connecting member 51 faces the control side board main surface 34a of the circuit board 31. It may be attached to the main body 34 in a state of straddling the main surface 34b of the substrate.

○ シャント抵抗器４０と回路基板３１を接続する接続部材５１は、逆Ｕ形であってもよい。逆Ｕ形の接続部材５１は、長板状の金属板を逆Ｕ形に屈曲させて形成され、長さ方向の一端側に基板側接続部５２を有し、長さ方向の他端側に抵抗側接続部５３を有する。また、逆Ｕ形の接続部材５１は、基板側接続部５２と抵抗側接続部５３を繋ぐ屈曲部を有する。 The connecting member 51 that connects the shunt resistor 40 and the circuit board 31 may have an inverted U shape. The inverted U-shaped connecting member 51 is formed by bending a long plate-shaped metal plate into an inverted U shape, has a substrate side connecting portion 52 on one end side in the length direction, and has a substrate side connecting portion 52 on the other end side in the length direction. It has a resistance side connection portion 53. Further, the inverted U-shaped connecting member 51 has a bent portion that connects the substrate side connecting portion 52 and the resistance side connecting portion 53.

そして、基板側接続部５２は、収容空間Ｓ内の回路基板３１の制御側基板主面３４ａ又は対向基板主面３４ｂに接続される。接続部材５１の基板側接続部５２は、連通口を通じて第１壁部２０の上側へ引き出されるとともに、屈曲部によって折り返された抵抗側接続部５３は、第２ケース部材１５の第１蓋板１６に対向配置される。そして、接続部材５１の抵抗側接続部５３にシャント抵抗器４０が接続される。 Then, the substrate side connecting portion 52 is connected to the control side substrate main surface 34a or the facing substrate main surface 34b of the circuit board 31 in the accommodation space S. The substrate-side connecting portion 52 of the connecting member 51 is pulled out to the upper side of the first wall portion 20 through the communication port, and the resistance-side connecting portion 53 folded back by the bent portion is the first lid plate 16 of the second case member 15. It is arranged to face each other. Then, the shunt resistor 40 is connected to the resistance side connecting portion 53 of the connecting member 51.

電流計測装置５０において、シャント抵抗器４０の対向シャント主面４０ｃが、第２ケース部材１５の第１蓋板１６に対向配置され、第１蓋板１６が対向壁部となる。この場合、回路基板３１の対向基板主面３４ｂと、シャント抵抗器４０の対向シャント主面４０ｃとは、第１蓋板１６を挟んで平行であり、仮想直線Ｍは対向基板主面３４ｂと対向シャント主面４０ｃに直交する直線となる。また、第１壁部２０が連通口の形成された連通口壁部となる。 In the current measuring device 50, the facing shunt main surface 40c of the shunt resistor 40 is arranged to face the first lid plate 16 of the second case member 15, and the first lid plate 16 serves as the facing wall portion. In this case, the facing board main surface 34b of the circuit board 31 and the facing shunt main surface 40c of the shunt resistor 40 are parallel to each other with the first lid plate 16 interposed therebetween, and the virtual straight line M faces the facing board main surface 34b. It is a straight line orthogonal to the shunt main surface 40c. Further, the first wall portion 20 becomes a communication port wall portion in which a communication port is formed.

○ シャント抵抗器４０は、基板側端面４０ｇが第２蓋板１７の外面１７ａから第３方向Ｚに離間した位置に配置されていてもよい。この場合、シャント抵抗器４０は、連通口１７ｂを通じてケース１３の外部には配置されておらず、接続部材５１の抵抗側接続部５３のみが連通口１７ｂを通じてケース１３の外部に配置されている。 The shunt resistor 40 may be arranged at a position where the substrate side end surface 40 g is separated from the outer surface 17a of the second lid plate 17 in the third direction Z. In this case, the shunt resistor 40 is not arranged outside the case 13 through the communication port 17b, and only the resistance side connecting portion 53 of the connecting member 51 is arranged outside the case 13 through the communication port 17b.

○ シャント抵抗器４０の電極端子４２と接続部材５１とを締結する方法は、抵抗用リベット６５に変えてボルト及びナットで行ってもよいし、回路基板３１と接続部材５１とを締結する方法は、基板用リベット６４に変えてボルト及びナットで行ってもよい。 ○ The method of fastening the electrode terminal 42 of the shunt resistor 40 and the connecting member 51 may be performed with bolts and nuts instead of the resistance rivet 65, or the method of fastening the circuit board 31 and the connecting member 51 may be performed. , The rivet 64 for the substrate may be replaced with bolts and nuts.

○ シャント抵抗器４０の電極端子４２と抵抗側接続部５３との間に弾性部材４８を介在させなくてもよい。
○ 接続部材５１の基板側接続部５２と回路基板３１とは半田によって電気的に接続され、接続部材５１の抵抗側接続部５３とシャント抵抗器４０とは半田によって電気的に接続されていてもよい。 ○ It is not necessary to interpose the elastic member 48 between the electrode terminal 42 of the shunt resistor 40 and the resistance side connection portion 53.
○ Even if the board-side connection portion 52 of the connection member 51 and the circuit board 31 are electrically connected by solder, and the resistance-side connection portion 53 of the connection member 51 and the shunt resistor 40 are electrically connected by solder. good.

○ シャント抵抗器４０の開放シャント主面４０ｂ及び対向シャント主面４０ｃの延長面Ｔ１と、回路基板３１の制御側基板主面３４ａ及び対向基板主面３４ｂの延長面Ｔ２とは交差していれば直交していなくてもよい。 ○ If the extension surface T1 of the open shunt main surface 40b and the opposite shunt main surface 40c of the shunt resistor 40 intersects with the extension surface T2 of the control side substrate main surface 34a and the opposite substrate main surface 34b of the circuit board 31. It does not have to be orthogonal.

○ シャント抵抗器４０と回路基板３１は一体化されていなくてもよい。例えば、シャント抵抗器４０を第２ケース部材１５の接続壁部１８に支持させ、回路基板３１を第１ケース部材１４の底板１４ａに支持させてもよい。 ○ The shunt resistor 40 and the circuit board 31 do not have to be integrated. For example, the shunt resistor 40 may be supported by the connection wall portion 18 of the second case member 15, and the circuit board 31 may be supported by the bottom plate 14a of the first case member 14.

○ 電流計測装置５０は、二次電池１２を複数有する電池パック１０ではなく、バッテリに設けられてもよい。
○ ナット６３と螺合される螺合部材は、接続用ボルト６１ではなくねじであってもよい。 The current measuring device 50 may be provided in the battery instead of the battery pack 10 having a plurality of secondary batteries 12.
○ The screwing member screwed with the nut 63 may be a screw instead of the connecting bolt 61.

○ 外部接続部材は、丸端子を有するワイヤであってもよい。
○ バスバー６０と電極端子４２とはリベットによって接続してもよいし、バスバー６０を貫通した軸部材を、電極端子４２の連結孔４２ｂに嵌入してバスバー６０と基板側接続部５２を接続してもよい。この場合、接続壁部１８のナット受部１８ｃ及びナット６３は削除される。 ○ The external connection member may be a wire having a round terminal.
○ The bus bar 60 and the electrode terminal 42 may be connected by rivets, or a shaft member penetrating the bus bar 60 may be fitted into the connecting hole 42b of the electrode terminal 42 to connect the bus bar 60 and the substrate side connecting portion 52. May be good. In this case, the nut receiving portion 18c and the nut 63 of the connecting wall portion 18 are deleted.

Ｆ…並設方向、Ｓ…収容空間、１３…ケース、１７…連通口壁部としての第２蓋板、１７ｂ…連通口、１８…対向壁部としての接続壁部、１８ｃ…ナット受部、２３…被覆壁部、３１…回路基板、３２…制御部としての電圧増幅ＩＣ、３４ａ…基板主面としての制御側基板主面、３４ｂ…基板主面としての対向基板主面、４０…シャント抵抗器、４０ｂ…開放シャント主面、４０ｃ…対向シャント主面、４０ｇ…基板側端面、４１…抵抗体、４２…電極端子、４２ｂ…連結孔、５０…電流計測装置、５１…接続部材、５２…基板側接続部、５３…抵抗側接続部、６０…外部接続部材としてのバスバー、６１…螺合部材としての接続用ボルト、６３…ナット。 F ... parallel direction, S ... accommodation space, 13 ... case, 17 ... second lid plate as communication port wall part, 17b ... communication port, 18 ... connection wall part as facing wall part, 18c ... nut receiving part, 23 ... Covered wall portion, 31 ... Circuit board, 32 ... Voltage amplification IC as control unit, 34a ... Control side substrate main surface as substrate main surface, 34b ... Opposed substrate main surface as substrate main surface, 40 ... Shunt resistance Instrument, 40b ... Open shunt main surface, 40c ... Opposing shunt main surface, 40g ... Substrate side end surface, 41 ... Resistor, 42 ... Electrode terminal, 42b ... Connecting hole, 50 ... Current measuring device, 51 ... Connecting member, 52 ... Board side connection part, 53 ... Resistance side connection part, 60 ... Bus bar as an external connection member, 61 ... Connection bolt as a screw member, 63 ... Nut.

Claims (7)

電流経路に設けられる電流計測装置であって、
平板状の抵抗体、及び当該抵抗体の厚さ方向に交差する一つの方向である並設方向に沿って前記抵抗体を挟む一対の電極端子を有するシャント抵抗器と、
前記抵抗体の前記一対の電極端子の電圧を計測する制御部が一対の基板主面のうちの一方に配置された回路基板と、
前記回路基板の両方の前記基板主面を覆う状態で当該回路基板を収容するとともに前記回路基板の収容空間を画成するケースと、を有しており、
前記シャント抵抗器は、前記抵抗体の前記厚さ方向の両面にシャント主面を有し、
前記シャント抵抗器の一対の前記シャント主面のうち、前記回路基板に近い一方の前記シャント主面を対向シャント主面とするとともに他方の前記シャント主面を開放シャント主面とし、
前記回路基板の一対の前記基板主面のうち、前記シャント抵抗器に近い一方の前記基板主面を対向基板主面とすると、
前記ケースは、前記対向シャント主面と対向し、かつ前記収容空間を画成する対向壁部を有し、前記対向壁部は、前記対向シャント主面と前記収容空間との間に介在するとともに、前記開放シャント主面は前記ケースの外部に向けて露出していることを特徴とする電流計測装置。 A current measuring device installed in the current path.
A shunt resistor having a flat plate-shaped resistor and a pair of electrode terminals sandwiching the resistor along a parallel direction, which is one direction intersecting the thickness direction of the resistor.
A circuit board in which a control unit for measuring the voltage of the pair of electrode terminals of the resistor is arranged on one of the main surfaces of the pair of boards.
It has a case in which the circuit board is accommodated in a state of covering both the main surfaces of the circuit board and the accommodation space of the circuit board is defined.
The shunt resistor has shunt main surfaces on both sides of the resistor in the thickness direction.
Of the pair of shunt main surfaces of the shunt resistor, one of the shunt main surfaces close to the circuit board is used as the facing shunt main surface, and the other shunt main surface is used as the open shunt main surface.
Assuming that one of the pair of main boards of the circuit board, which is close to the shunt resistor, is the main surface of the opposite board.
The case has a facing wall portion that faces the facing shunt main surface and defines the accommodation space, and the facing wall portion is interposed between the facing shunt main surface and the accommodation space. A current measuring device characterized in that the main surface of the open shunt is exposed toward the outside of the case. 前記ケースは、前記収容空間と前記ケースの外部とを連通する連通口を有するとともに、当該連通口を形成する連通口壁部を有し、前記連通口壁部の外面に対し前記対向壁部の外面が交差し、
前記シャント抵抗器において前記対向シャント主面及び前記開放シャント主面を繋ぐ側端面は、前記連通口の開口に面している、又は前記連通口内に位置している請求項１に記載の電流計測装置。 The case has a communication port that communicates the accommodation space with the outside of the case, and also has a communication port wall portion that forms the communication port, and has a communication port wall portion that faces the outer surface of the communication port wall portion. The outer surfaces intersect,
The current measurement according to claim 1, wherein in the shunt resistor, the side end surface connecting the facing shunt main surface and the open shunt main surface faces the opening of the communication port or is located in the communication port. Device. 前記シャント抵抗器と、前記回路基板には接続部材が接続され、前記接続部材は、前記シャント抵抗器に固定される平板状の抵抗側接続部と、前記回路基板に固定される平板状の基板側接続部とを有するとともに、前記抵抗側接続部と前記基板側接続部とは交差しており、当該接続部材によって前記シャント抵抗器と前記回路基板とが一体化され、前記抵抗側接続部が前記連通口を通じて前記ケースの外部に配置されている請求項２に記載の電流計測装置。 A connecting member is connected to the shunt resistor and the circuit board, and the connecting member is a flat plate-shaped resistor-side connecting portion fixed to the shunt resistor and a flat plate-shaped substrate fixed to the circuit board. It has a side connection portion, and the resistance side connection portion and the substrate side connection portion intersect with each other. The shunt resistor and the circuit board are integrated by the connection member, and the resistance side connection portion is formed. The current measuring device according to claim 2, which is arranged outside the case through the communication port. 前記基板側接続部は、前記対向基板主面に接続されるとともに、前記抵抗側接続部は、前記対向シャント主面に接続されている請求項３に記載の電流計測装置。 The current measuring device according to claim 3, wherein the substrate-side connecting portion is connected to the opposed substrate main surface, and the resistance-side connecting portion is connected to the opposed shunt main surface. 一対の前記電極端子は、当該電極端子に外部接続部材を接続するための螺合部材が挿通される連結孔を有し、
前記対向壁部は、前記連結孔と重合する位置に前記螺合部材が螺合されるナットを支持するナット受部を有する請求項２〜請求項４のうちいずれか一項に記載の電流計測装置。 The pair of electrode terminals has a connecting hole through which a screwing member for connecting an external connecting member is inserted.
The current measurement according to any one of claims 2 to 4, wherein the facing wall portion has a nut receiving portion that supports a nut into which the screwing member is screwed at a position where it overlaps with the connecting hole. Device. 前記対向壁部には前記シャント抵抗器が支持されている請求項２〜請求項５のうちいずれか一項に記載の電流計測装置。 The current measuring device according to any one of claims 2 to 5, wherein the shunt resistor is supported on the facing wall portion. 前記ケースは、前記開放シャント主面における前記抵抗体を覆う被覆壁部を有する請求項１〜請求項６のうちいずれか一項に記載の電流計測装置。 The current measuring device according to any one of claims 1 to 6, wherein the case has a covering wall portion covering the resistor on the main surface of the open shunt.
JP2020005025A 2020-01-16 2020-01-16 Electric current measurement device Pending JP2021113685A (en)

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