JP2011145072A - Current detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a current detector preventing a short circuit between an electrode for current detection and another part, or a current leakage, from occurring, thereby preventing malfunction and circuit faults caused by the occurrence thereof. <P>SOLUTION: This current detector 100 is equipped with: a bus bar 110 as a resistor; a current detection terminal 110A detecting a potential difference between two points along a current-carrying direction of the bus bar 110 and a ground terminal 110B for sensing; a circuit board 120 mounted with a current detection circuit detecting a current flowing through the resistor based on voltages between these terminals; a casing 130 having a recess that forms an internal space storing the circuit board 120; and a lid 150 closing the recess in the casing 130. The internal space of the casing 130 and the circuit board 120 are disposed in non-parallel to the ground. The detection terminal 110A and the ground terminal 110B are disposed in the internal space of the casing 130 and in an upper part thereof distant from the ground. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a current detection device that is mounted on a passenger car, a truck, or the like and detects a charge / discharge current of a battery.

  2. Description of the Related Art Conventionally, a current sensor is known in which a current detection circuit housed in a case is provided in an intermediate portion in the longitudinal direction of a flat-plate bus bar (see, for example, Patent Document 1). In this current sensor, the bus bar constitutes a ground terminal, and this current sensor is attached to the negative terminal side of the battery so as to detect the charge / discharge current of the battery. In this current sensor, when the vehicle is mounted, the bus bar is mounted so as to face in the vertical direction. Therefore, electrodes for detecting potentials at two locations of the bus bar are arranged in a line along the vertical direction in the case, and the connector The tip portions of the terminals are arranged in a line along the vertical direction so as to be adjacent to these two electrodes.

Japanese Patent Laying-Open No. 2008-39571 (page 20, FIG. 10)

  By the way, in the structure disclosed in Patent Document 1, when water enters the case due to breakage or dew condensation of the case, if the vicinity of the downward (ground side) electrode or connector terminal is covered with water, There is a problem that a short circuit or current leakage may occur between the electrodes or between the electrodes and other parts, and an unexpected current may flow, causing malfunction or circuit failure. In Patent Document 1, a sealing material is disposed in a case to protect the electrode, IC chip, and the like from being exposed to water. However, when the sealing material deteriorates or changes over time, a gap between the sealing material and the electrode, etc. In such a case, a structure that can prevent a short circuit or current leakage between the electrode and another part is desired.

  The present invention was created in view of the above points, and the purpose of the present invention is to prevent a short circuit between the electrode for current detection and other parts and the occurrence of current leakage. An object of the present invention is to provide a current detection device capable of preventing the accompanying malfunction and circuit failure.

  In order to solve the above-described problem, the current detection device of the present invention is a current detection device that detects a current flowing through a harness through a terminal of a battery, and is fixed to the wiring on the battery side to be electrically connected. A first fixing portion; a second fixing portion in which a harness is fixed and electrical connection is made; a bus bar formed integrally with the first and second fixing portions; and a first and second fixing Based on the voltage between the plurality of electrodes, a resistor inserted between the bus bar and formed integrally or separately with the bus bar, a plurality of electrodes for detecting a potential difference at two points along the energizing direction of the resistor A circuit board on which a current detection circuit for detecting a current flowing through the resistor is mounted, a case having a recess that forms an internal space for housing the circuit board, a lid that closes the recess of the case, and an internal space. Multiple external interfaces And a Esu terminal. The electrodes and the external interface terminals are connected to the circuit board by soldering, and the electrodes and the external interface terminals are arranged at the farthest positions on the circuit board. Specifically, in the circuit board described above, it is desirable to dispose each of the electrode and the external interface terminal in a diagonal region of the circuit board.

  As a result, it is possible to prevent a short circuit or current leakage between the electrode exposed on the circuit board and the external interface terminal. In addition, by performing soldering at two locations on the circuit board in a diagonal region, it is possible to make the generation of thermal distortion uniform compared to the case of soldering at only one location, and to reduce the stress generated on the circuit board. Can be minimized. Furthermore, since it is possible to fix the circuit board by soldering at the two locations, it is possible to secure strength against vibrations and other fixing means such as screws are unnecessary.

  The plurality of external interface terminals described above preferably include a power supply terminal connected to a terminal having a polarity opposite to the terminal of the battery to which the first fixed portion is connected. Thereby, it is possible to prevent the battery terminals from being short-circuited in the current detection device or the current from leaking between these electrodes.

  The circuit board described above has a communication circuit connected to the external interface terminal, and the current detection circuit to which the electrode is connected and the communication circuit to which the external interface terminal is connected are separated from each other in a diagonal area of the circuit board. It is desirable to arrange in such a state. If the current detection circuit and the communication circuit are formed in close proximity to each other on the circuit board or are formed in close and parallel positions, crosstalk will occur between these circuits. By reducing the crosstalk between them as far as possible by arranging them in the region, it is possible to improve the current detection accuracy.

  Further, the plurality of external interface terminals described above are arranged in a plurality of columns parallel to the electrodes, and a plurality of external interface terminals belonging to the column closer to the electrode are between the plurality of external interface terminals belonging to the column far from the electrode. It is desirable that an external interface terminal is arranged. By arranging a plurality of external interface terminals in a staggered manner, the pitch between the external interface terminals is reduced, and the width (L1 in FIG. 5) between the row far from the electrode and the row closer to the electrode is narrowed. Therefore, without changing the internal space of the case or the area of the circuit board, the electrode and the external interface terminal can be further separated, and a short circuit and current leakage between them can be further prevented. In addition, by arranging the external interface terminals in a plurality of rows, it becomes easy to secure the location of the pressing pins in insert molding, and insert molding can be performed without tilting the pins.

  The internal space and the circuit board described above are disposed non-parallel to the ground, and the plurality of electrodes are desirably disposed in the internal space of the case and in the upper part far from the ground. By disposing the electrode for current detection in the upper part of the internal space of the case, even if water enters the internal space due to breakage of the case or lid or condensation, the current detection electrode is covered with water. Or even if it is flooded, it is possible to prevent water from staying in the vicinity of the electrode thereafter, and the current detection electrode and other parts may be short-circuited or Thus, current leakage can be prevented, and malfunctions and circuit failures associated with these can be prevented.

  Moreover, it is desirable that the internal space and the circuit board described above are arranged in a direction perpendicular to the ground. By adopting such an arrangement, it is possible to further prevent the electrode from being wet or staying with water.

  In addition, the case described above is formed of a resin material, and each of the plurality of external interface terminals protrudes partly into the internal space of the case and the other part is embedded inside the case and embedded inside the case. It is desirable that the portion to be bent has a bent shape. Accordingly, the position of the external interface terminal can be constrained inside the case formed of a resin material. For example, when the external interface terminal has a pin shape, it is possible to prevent the pin from coming off.

It is sectional drawing which shows the structure of the electric current detection apparatus of one Embodiment. It is a side view of an electric current detection apparatus. It is a perspective view of an electric current detection apparatus. It is a front view of an electric current detection apparatus. It is a figure which shows the detail of the external interface terminal arrange | positioned at 2 rows. It is a figure which shows the partial detailed shape of an external interface terminal. It is a figure which shows the example of a connection of the specific example of the circuit of an electric current detection apparatus, a battery, etc. FIG. It is a figure which shows the modification of an electric current detection apparatus.

  Hereinafter, a current detection device according to an embodiment to which the present invention is applied will be described in detail with reference to the drawings. The current detection device of the present embodiment is mounted and fixed on, for example, a vehicle lead battery, and can be used to detect a charge / discharge current of the battery.

  FIG. 1 is a cross-sectional view illustrating a configuration of a current detection device according to an embodiment, and illustrates a state where the current detection device is attached to a battery. 2 is a side view of the current detection device, and FIG. 3 is a perspective view of the current detection device.

  As shown in these drawings, the current detection device 100 of this embodiment includes a bus bar 110 as a resistor (shunt resistor) formed using a conductive material, and two locations along the energization direction of the bus bar 110. Electrical connection is made between the circuit board 120 on which the current detection circuit for detecting the current flowing through the bus bar 110 based on the potential difference is mounted, the case 130 housing the bus bar 110 and the circuit board 120, and the circuit board 120. The connector 140 has a plurality of connector terminals 142 exposed to the inside, and a lid 150 that closes an opening of a recess that forms an internal space of the case 130 in which the circuit board 120 is accommodated.

  The bus bar 110 has a U shape that is folded back in the case 130, and one end portion is fixed to the wiring on the battery 200 side to form a first fixing portion 112 that is electrically connected, The other end portion is fixed to the harness to form a second fixing portion 114 that is electrically connected. The bus bar 110 is formed by press-molding a single plate-like member.

  In the present embodiment, specifically, the case 130 having a rectangular parallelepiped shape in the vicinity of the side surface of the battery 200 (the side surface closest to the terminal 202 of the battery 200 to which the current detection device 100 is attached) is specifically vertically long. The internal space of the case 130 and the circuit board 120 accommodated therein are arranged so as to be perpendicular to the ground. First and second fixing portions 112 and 114 protrude in the horizontal direction on both sides of the vertically long case 130.

  The first fixing portion 112 has a U-shaped cross section, and a through hole 112A (see FIG. 3) is formed in a part of the U-shaped bottom surface. On the other hand, as shown in FIG. 1, the current detection device 100 is attached to the negative terminal 202 of the battery 200, and a mounting bracket 210 that also serves as a wiring between the negative terminal 202 and the first fixing portion 112 is attached. ing. A bolt 211 projects upward from the end of the mounting bracket 210. In the present embodiment, the bolt 211 of the mounting bracket 210 is inserted into the through hole 112A from the recessed opening side of the first fixing portion 112 having a U-shaped shape, and the first fixing portion 112 is a nut (not shown). ), The first fixing portion 112 is fixed to the mounting bracket 210. In this case, the concave bottom surface (lower surface) to which the mounting bracket 210 is attached in the first fixing portion 112 is the mounting surface (first mounting surface) 112B (see FIG. 2).

  The second fixing portion 114 is provided with a through hole in the vicinity of the end portion, and a bolt 115 is inserted into the through hole. On the other hand, a terminal 302 having a through hole is provided at an end portion of the harness 300 electrically connected to the second fixing portion 114, and the second fixing portion 114 is provided in the through hole of the terminal 302. The terminal 302 is fixed to the second fixing portion 114 by inserting the bolt 115 and tightening the terminal 302 with a nut (not shown). In this case, the upper surface to which the terminal 302 is attached in the second fixing portion 114 is the attachment surface (second attachment surface) 114B (see FIG. 2).

  In the present embodiment, the case 130 is formed of a resin material having good insulation and thermal conductivity, for example, PPS (polyphenylene sulfide) resin, and is externally provided as the first fixing portion 112 or the second fixing portion 114. Most of the bus bar 110 excluding the exposed portion is insert-molded with this resin material.

  From the U-shaped bus bar 110, a current detection terminal 110A as a plurality of electrodes and sensing for detecting a potential difference between these two locations from two locations spaced apart from each other with a U-shaped folded portion interposed therebetween. The ground terminal 110 </ b> B extends to the circuit board 120 side. The two current detection terminals 110A and the sensing ground terminal 110B are formed at the same time when the bus bar 110 is formed by press-molding a conductive material (metal material) plate, and then the plate is bent into a U shape. At this time, or after being bent, it is bent toward the circuit board 120 side. In the present embodiment, the circuit ground terminal 110C is drawn from substantially the same position of the bus bar 110 as well as the sensing ground terminal 110B. The reason why the circuit ground terminal 110C is provided separately from the sensing ground terminal 110B is to suppress fluctuations in the potential of the sensing ground terminal 110B as much as possible during the operation of various circuits mounted on the circuit board 120. Two terminals (current detection terminal 110A, sensing ground terminal 110B, circuit ground terminal 110C) extending from the bus bar 110 are connected to a current detection circuit in the circuit board 120 by soldering, for example.

  A plurality of pin-shaped external interface terminals 144 integrally formed with each of the plurality of connector terminals 142 in the connector 140 extend from a part of the case 130 to the circuit board 120 side. The plurality of external interface terminals 144 include a power supply terminal connected to a positive terminal (not shown) having a polarity opposite to that of the negative terminal 202 of the battery 200 to which the first fixing portion 112A is connected. . These external interface terminals 144 are connected to a communication circuit in the circuit board 120 by, for example, soldering.

  In the present embodiment, the first mounting surface 112B for mounting the mounting bracket 210 on the battery 200 side in the first fixing portion 112, and the second mounting surface 114B for mounting the terminal 302 of the harness 300 on the second fixing portion 114. Each is set so as to be parallel to the upper surface 200A (FIG. 1) of the battery 200.

  Each of the first and second attachment surfaces 112B and 114B is disposed above the battery 200, and the second attachment surface 114B on the harness 300 side than the first attachment surface 112B on the battery 200 side. Is located at a lower position. Here, “above the battery 200” means in the vicinity of the upper surface 200A of the battery 200. For example, the tip of the bolt 115 provided on the second fixing portion 114 on the lower side is higher than the upper surface 200A of the battery 200. The position of the second mounting surface 114B is determined so as not to be lowered.

  For example, the first mounting surface 112 </ b> B is set to the same height as the terminal 202 of the battery 200. Further, the second mounting surface 114 </ b> B is set at a position lower than the terminal 202 of the battery 200, more specifically at a position lower than the upper surface 200 </ b> A of the battery 200.

  The entire current detection device 100 of this embodiment has such a structure. Next, the current detection terminal 110A, the sensing ground terminal 110B, the circuit ground terminal 110C, and the external interface that are soldered to the circuit board 120 are used. A specific arrangement and the like of the terminal 144 will be described.

  FIG. 4 is a front view of the current detection device 100 and shows a state in which the lid 150 is removed. As shown in FIG. 4, the circuit board 120 is housed in the recess of the case 130 with the lid 150 removed. As described above, the circuit board 120 is arranged in a direction perpendicular to the ground, that is, non-parallel to the ground, and includes a current detection terminal 110A, a sensing ground terminal 110B, and a circuit ground terminal 110C. Are arranged at the upper part far from the ground in the internal space of the recess of the case 130.

  By disposing each of the current detection terminal 110A, sensing ground terminal 110B, and circuit ground terminal 110C in the upper part of the internal space of the case 130, water may enter the internal space due to damage or condensation of the case 130 or the lid 150. Even if the current detection terminal 110A, the sensing ground terminal 110B, etc. are flooded, or even if flooded, the water is prevented from staying in the vicinity of these terminals thereafter. be able to. Thereby, it is possible to prevent each of the current detection terminal 110A, the sensing ground terminal 110B, and the circuit ground terminal 110C from being short-circuited to each other part, or current leakage between them. It is possible to prevent malfunctions and circuit failures due to occurrence of short circuits.

  Further, these terminals are arranged on the circuit board 120 so that the current detection terminal 110A, the sensing ground terminal 110B, the circuit ground terminal 110C, and the external interface terminal 144 are arranged farthest from each other. Yes. In the present embodiment, since the circuit board 120 has a quadrangular shape, the farthest position is a diagonal area (both ends of the diagonal line). In the example shown in FIG. 4, the current detection terminal 110A, A sensing ground terminal 110B and a circuit ground terminal 110C are disposed, and an external interface terminal 144 is disposed near the lower right.

  As a result, a short circuit or current leakage between the current detection terminal 110A and the like exposed on the circuit board 120 and the external interface terminal 144 can be prevented. In addition, by performing soldering at two locations on the circuit board 120 in the diagonal region, the occurrence of thermal distortion can be made uniform as compared with the case where soldering is performed at only one location, which occurs in the circuit board 120. Stress can be minimized. Furthermore, since it is possible to fix the circuit board 120 by soldering at the two locations, it is possible to secure strength against vibrations and other fixing means such as screws are unnecessary.

  In addition, as described above, the plurality of external interface terminals 144 include a power supply terminal connected to a positive terminal having a polarity opposite to the negative terminal 202 of the battery 200 to which the first fixing portion 112 is connected. Since the power supply terminals are arranged at positions separated from the current detection terminal 110A, the sensing ground terminal 110B, and the circuit ground terminal 110C, the terminals of the battery 200 may be short-circuited in the current detection device 100, or the like. Current leakage between the terminals can be prevented.

  As shown in FIG. 4, the external interface terminal 144 is connected to the circuit board 120 separately from the current detection circuit 400 to which the current detection terminal 110 </ b> A, the sensing ground terminal 110 </ b> B, and the circuit ground terminal 110 </ b> C are connected. The current detection circuit 400 and the communication circuit 410 are arranged in a state of being separated in a rectangular diagonal region. When the current detection circuit 400 and the communication circuit 410 are formed in close proximity to each other on the circuit board 120 or in close contact with each other, crosstalk occurs between these circuits. By reducing the crosstalk between them as far as possible by arranging them in the corner region, it is possible to improve the current detection accuracy.

  Further, a plurality of (for example, eight) external interface terminals 144 described above are provided, and are arranged in a plurality of rows (for example, two rows) parallel to the plurality of electrodes and the ground. Moreover, between the four external interface terminals 144 belonging to the row closer to the ground (the side far from the plurality of electrodes), the external interface terminals 144 belonging to the row far from the ground (the side closer to the plurality of electrodes) , The position is shifted. FIG. 5 is a diagram showing details of the external interface terminals 144 arranged in two rows.

  By arranging the external interface terminals 144 in a plurality of rows in a staggered manner, the width along the direction perpendicular to the ground can be reduced, so that current detection can be performed without changing the internal space of the case 130 or the area of the circuit board 120. The terminal 110A, the sensing ground terminal 110B, the circuit ground terminal 110C, and the external interface terminal 144 can be further separated from each other, and a short circuit and current leakage among these can be further prevented. Further, for example, assuming that the external interface terminal 144 is bent in the case 130 in a direction perpendicular to the ground, the location of the pressing pin when insert molding is performed by arranging the external interface terminals 144 in a plurality of rows. It becomes easy to secure.

  FIG. 5A shows a case where the external interface terminals 144 are arranged in two rows without shifting the position. Considering the case of securing the distance L0 between the adjacent external interface terminals 144, the interval L1 between the two columns in the present embodiment shown in FIG. 5B is smaller than L0. In addition, since the position of the leftmost external interface terminal 144 far from the ground is shifted to the right, the leftmost external interface terminal 144 is between the current detection terminal 110A, the sensing ground terminal 110B, and the circuit ground terminal 110C. The distance of can be further increased.

  Each of the plurality of external interface terminals 144 has a shape in which a part protrudes into the internal space of the case 130, the other part is embedded in the case 130, and a part embedded in the case 130 is bent. Yes. FIG. 6 is a diagram showing a partial detailed shape of the external interface terminal 144. FIG. 6A shows a front view and FIG. 6B shows a side view. In FIG. 6, a range indicated by P indicates a range embedded in the case 130. As shown in FIG. 6, since the external interface terminal 144 is bent in the case 130, the position of the external interface terminal 144 can be constrained inside the case 130 formed of a resin material. When the terminal 144 has a pin shape, it is possible to prevent the pin from coming off.

  FIG. 7 is a diagram illustrating a connection example between a specific example of the circuit of the current detection device 100 and the battery 200 or the like. As shown in FIG. 7, the circuit board 120 of the current detection device 100 includes a differential amplifier 10 connected to both ends of a shunt resistor 100 ′ as a resistor formed by a part of the bus bar 110, and a plus of the battery 200. Differential amplifier 12, temperature detection unit 20, current detection processing unit 30, voltage detection processing unit 32, temperature detection processing unit 34, battery state detection unit 36, charge control unit 40, communication input / output Sections (communication I / O) 50 and 52, a CAN interface (CAN I / F) 60 that transmits and receives data according to the CAN protocol, and a LIN interface (LIN I / F) 62 that transmits and receives data according to the LIN protocol And is equipped. One differential amplifier 10 amplifies the voltage across the shunt resistor 100 ′, and the current detection processing unit 30 detects the current flowing through the shunt resistor 100 ′ based on the output voltage of the differential amplifier 10. The differential amplifier 10 and the current detection processing unit 30 constitute a current detection circuit. The other differential amplifier 12 converts the voltage across the battery 200 (battery voltage) to an appropriate level, and the voltage detection processing unit 32 detects the battery voltage based on the output voltage of the differential amplifier 12. The temperature detection unit 20 is configured by a voltage dividing circuit including a resistor and a thermistor. The resistance value of the thermistor changes according to the temperature, and the divided voltage of the voltage dividing circuit changes. The temperature detection processing unit 34 detects the temperature of the current detection device 100 (the temperature of the battery 200) based on the output voltage (divided voltage) of the temperature detection unit 20. The battery state detection unit 36 takes in the detection values of the current detection processing unit 30, the voltage detection processing unit 32, and the temperature detection processing unit 34, and generates a battery state signal. The current detection processing unit 30, voltage detection processing unit 32, temperature detection processing unit 34, and battery state detection unit 36 constitute a state detection sensor 38. The charge control unit 40 controls the power generation state of the vehicle generator (G) 80 based on the battery state signal generated by the battery state detection unit 36. This power generation control is performed by sending an instruction to the power generation control device 82 mounted on the vehicle generator 80 via the communication input / output unit 52 and the LIN interface 62. The battery status signal generated by the battery status detection unit 36 is sent to the vehicle system 70 via the communication input / output unit 50 and the CAN interface 60. The vehicle system 70 performs integrated control on the engine and various electric loads based on the received battery state signal and the like.

  A current detection circuit 400 is formed by the differential amplifier 10 and the current detection processing unit 30 described above. The communication input / output units 50 and 52, the CAN interface 60, and the LIN interface 62 described above form a communication circuit 410.

  In addition, this invention is not limited to the said embodiment, A various deformation | transformation implementation is possible within the range of the summary of this invention. In the embodiment described above, the case where the bus bar 100 and the resistor are integrated has been described. However, a resistor separate from the bus bar 100 may be used.

  Further, in the above-described embodiment, the current detection device 100 is attached to the negative terminal 202 of the battery 200 via the mounting bracket 210. However, the first detection portion 112 of the current detection device 100 may be modified to be long. The current detection device 100 may be directly attached to the negative terminal 202.

  In the above-described embodiment, the case where the current detection device 100 is installed in a direction perpendicular to the ground has been described. However, the current detection device 100 may be installed non-parallel or parallel to the ground. In the above-described embodiment, the shape of the internal space of the case 130 that accommodates the circuit board 120 is a quadrilateral shape, but may be a polygonal shape other than the rectangular shape or other shapes.

  FIG. 8 is a diagram illustrating a modification of the current detection device. In the current detection device 100A shown in FIG. 8, the case 130 is disposed on the upper surface 200A of the battery 200 so that the internal space of the case 130 and the circuit board 120A accommodated therein are oriented in parallel to the ground. ing. In addition, the circuit board 120A has a polygonal shape, and the electrodes (current detection terminal 110A, sensing ground terminal 110B, circuit ground terminal 110C) and the external interface terminal 144 are arranged in the diagonal region of the longest distance. Each is arranged. As described above, even when the circuit board 120A and the like are arranged in parallel to the upper surface 200A of the battery 200, a short circuit between the electrode (current detection terminal 110A and the like) exposed on the circuit board 120A and the external interface terminal 144 is possible. And current leakage can be effectively prevented.

  As described above, according to the present invention, the current detection terminal 110 </ b> A for current detection, the ground terminal 110 </ b> B for sensing, and the like are arranged in the upper part of the internal space of the case 130, so that the case 130 and the lid 150 are damaged or condensed. Even when water enters the internal space, the terminals are flooded, and even if they are flooded, it is prevented that water stays in the vicinity of these terminals afterwards. It is possible to prevent a short circuit between these terminals and other parts, or to prevent current leakage between them, and to prevent malfunctions and circuit failures caused by these occurrences. it can.

100, 110A Current detection device 110 Bus bar 110A Current detection terminal 110B Sensing ground terminal 110C Circuit ground terminal 112 First fixing portion 112A Through hole 112B First mounting surface 114 Second fixing portion 114B Second mounting surface 115 , 211 bolt 115A head 120, 120A circuit board 130 case 140 connector 142 connector terminal 144 external interface terminal 150 lid 200 battery 202, 302 terminal 210 mounting bracket 300 harness 400 current detection circuit 410 communication circuit

Claims (8)

A current detection device for detecting a current flowing through a harness through a terminal of a battery,
A first fixing portion fixed to the terminal on the battery side and electrically connected;
A second fixing portion where the harness is fixed and electrical connection is made;
A bus bar formed integrally with the first and second fixing portions;
A resistor inserted between the first and second fixing portions and formed integrally with or separate from the bus bar;
A plurality of electrodes for detecting a potential difference between two locations along the energization direction of the resistor;
A circuit board on which a current detection circuit for detecting a current flowing through the resistor based on a voltage between the plurality of electrodes is mounted;
A case having a recess that forms an internal space for housing the circuit board;
A lid for closing the recess of the case;
A plurality of external interface terminals arranged in the internal space;
The electrode and the external interface terminal are connected to the circuit board by soldering,
The current detection device characterized in that the electrode and the external interface terminal are arranged at the farthest positions on the circuit board. In claim 1,
Each of the electrode and the external interface terminal is arranged in a diagonal region of the longest distance of the circuit board. In claim 1 or 2,
The plurality of external interface terminals include a power supply terminal connected to a terminal having a polarity opposite to the terminal of the battery to which the first fixing portion is connected. In claim 2,
The circuit board has a communication circuit connected to the external interface terminal,
The current detection device, wherein the current detection circuit to which the electrode is connected and the communication circuit to which the external interface terminal is connected are arranged in a state of being separated in a diagonal area of the circuit board. In any one of Claims 1-4,
The plurality of external interface terminals are arranged in a plurality of rows parallel to the electrodes,
A plurality of external interface terminals belonging to a row closer to the electrode are arranged between the plurality of external interface terminals belonging to a row far from the electrode. In any one of Claims 1-5,
The internal space and the circuit board are arranged non-parallel to the ground,
The plurality of electrodes are arranged in an upper portion far from the ground in the internal space of the case. In claim 6,
The internal space and the circuit board are arranged in a direction perpendicular to the ground. In claim 5,
The case is formed of a resin material,
Each of the plurality of external interface terminals has a shape in which a part protrudes into the internal space of the case, the other part is embedded in the case, and a portion embedded in the case is bent. Current detector.

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