JP5137653B2 - Current sensor device - Google Patents

Description

  The present invention relates to a current sensor device particularly suitable for detecting the current of a battery in an engine room of a vehicle.

  A current sensor that is disposed between a battery and a harness and detects a current of the battery is generally known. (For example, refer to Patent Document 1). In the current sensor described in Patent Document 1, one end side is connected and fixed to a battery terminal connected to a battery post (hereinafter referred to as “electrode” or “terminal” as appropriate) made of a conductive material, and the other end side is a harness. A connecting member to be connected and fixed to the connection terminal is integrally provided.

There is also known a current sensor that is attached to a battery post provided on the upper surface of the in-vehicle battery and monitors the remaining capacity of the in-vehicle battery (see, for example, Patent Document 2). The current sensor described in Patent Document 2 is a type that can be directly attached to a battery post of a battery, and one end of a wire harness is attached to the current sensor, and the other end is connected to an electric junction box or body panel of a vehicle. It is supposed to be installed on.
JP 2006-85945 A (page 5-6, FIG. 1) Japanese translation of PCT publication No. 2003-517613 (page 5-6, FIG. 1a, FIG. 3)

  A current sensor as described above generally includes a shunt resistor formed of, for example, a rectangular plate having a thickness of 2 to 3 mm, and a shunt resistor made of a bus bar made of, for example, copper (Cu) welded to both ends of the shunt resistor. ing. And the connection part to which the round terminal of a harness is connected is formed in the opposite side to the welding part of each bus bar of this shunt resistor.

  When the end of the vehicle wire harness is connected to the connecting part of the shunt resistor, for example, the wire harness may be forcibly pulled when the wire harness is routed during vehicle assembly, or the wire harness may vibrate while the vehicle is running. Then, the vibration due to the tensile force or vibration is transmitted to the welded portion between the shunt resistor of the shunt resistor and the bus bar through the connecting portion, and there is a possibility that the welded portion is broken.

  An object of the present invention is to provide a current sensor device including a shunt resistor, and having a structure for protecting a welded portion between the shunt resistor of the shunt resistor and a bus bar.

In order to solve the above-described problem, a current sensor device according to claim 1 of the present invention provides:
In a current sensor device with a shunt resistor,
The shunt resistor is composed of a shunt resistor and a metal bus bar welded to both ends of the shunt resistor,
A harness connection part is formed at the end opposite to the welded part with the shunt resistor of each bus bar,
Harness connection portion of the bus bar is a fixed Ru current sensor apparatus to the battery mounting bracket,
The harness connecting portion and the bracket are provided with an engaging portion for detachably engaging the harness connecting portion with the battery mounting bracket .

  Since the current sensor device has such a structure, the wire harness connected to each bus bar of the shunt resistor, for example, is forcibly pulled when the wire harness is routed during vehicle assembly, or vibration during vehicle running Therefore, excessive stress due to vibration does not occur in the welded portion, and the shunt resistance of the shunt resistor and the welded portion of the bus bar portion can be protected.

Further, since the current sensor device has such a detachable structure with respect to the battery mounting bracket, it is possible to facilitate the attachment and detachment of the current sensor device.

A current sensor device according to claim 2 of the present invention is the current sensor device according to claim 1 ,
The battery mounting bracket includes a battery holding bracket having a U-shaped groove section and a battery misalignment prevention bracket fixed to the battery holding bracket, and the harness connecting portion of the shunt resistor has the battery misalignment. It is characterized by being fixed to the prevention bracket.

  By fixing the end of the bus bar of the shunt resistor in this way by using the battery displacement prevention bracket, it is possible to reliably prevent the displacement of the shunt resistor and protect the shunt resistor and the welded portion of the bus bar. it can.

A current sensor device according to claim 3 of the present invention is the current sensor device according to claim 2 ,
A part of the current sensor device is housed in a groove of the battery holding bracket.

  Thus, by accommodating a part of the current sensor device in the groove of the battery holding bracket, the current sensor device can be mechanically protected and hardly affected by noise.

A current sensor device according to claim 4 of the present invention is the current sensor device according to claim 3 ,
The part of the current sensor device housed in the groove of the battery holding bracket is a monitoring control unit of the current sensor device.

  By housing the monitoring control unit, which is an important part of the current sensor device, in the groove of the battery holding bracket, it is possible to prevent this portion from being particularly affected by noise.

A current sensor device according to claim 5 of the present invention is the current sensor device according to any one of claims 1 to 4 ,
A part of each bus bar of the shunt resistor is provided with at least one notch, and the part including the notch of the shunt resistor and the bus bar is integrally molded with resin. Yes.

  Since this portion of the shunt resistor is molded with a resin finger, it is possible to achieve waterproofing and dustproofing from the outside, and protection from foreign matter. Moreover, by providing the notch, the shunt resistor can be reliably fixed without being displaced in the cross-sectional direction after the resin molding.

A current sensor device according to a sixth aspect of the present invention is the current sensor device according to any one of the first to fifth aspects,
The periphery of the current sensor is covered with a cover made of an insulating member.

  By covering the current sensor device with such a cover, the current sensor device itself can be reliably protected.

  ADVANTAGE OF THE INVENTION According to this invention, it is a current sensor apparatus provided with the shunt resistor, Comprising: The current sensor apparatus with the structure which protects the welding part of the shunt resistance of a shunt resistor and a bus-bar can be provided.

  Hereinafter, a battery state detection sensor device as an embodiment of a current sensor device according to the present invention will be described with reference to the drawings. First, the first embodiment will be described. The battery state detection sensor device according to the first embodiment is a current sensor device including a shunt resistor, and the shunt resistor is formed from a metal bus bar welded to each end of the shunt resistor and the shunt resistor. Thus, a harness connecting portion is formed at the end of each bus bar opposite to the welded portion with the shunt resistor, and the harness connecting portion of the bus bar is fixed to the battery mounting bracket.

  FIG. 1 is a plan view of a battery state detection sensor device according to a first embodiment of a current sensor device according to the present invention. FIG. 2 is a harness longitudinal cross-sectional view of the battery state detection sensor device shown in FIG. FIG. 3 is a perspective view showing a state in which the battery state detection sensor device shown in FIG. 1 is attached to a battery mounted in the engine room of the vehicle. In FIG. 2, cross-sectional hatching is omitted for clarity of illustration.

  The battery state detection sensor device 1 according to the present embodiment includes a battery state detection sensor 100 that detects a charged state or a deteriorated state of a battery 50 mounted in an engine room of a vehicle, and is connected to a negative terminal 51 of the battery 50 at one end. The state of the battery 50 is detected by interposing a battery state detection sensor 100 in the middle of the wire harness 10 to which is connected.

  Unlike a normal current sensor that detects only the current value of the battery 50, the battery state detection sensor 100 measures the current flowing through the battery 50 and the values of the voltage, temperature, and impedance (internal resistance) of the battery 50, and has a unique algorithm. This is a high-performance sensor that detects the state of the battery (charge rate, degree of deterioration, discharge capacity, etc.) by performing the above calculation.

  The battery mounting bracket 15 to which the battery state detection sensor 100 is fixed includes a battery holding bracket 150 that is formed in a U shape by bending both side edges of an elongated metal plate having a certain thickness and has a groove portion 151 on the inside. The battery is made of a battery misalignment prevention bracket 160 in which an elongated metal plate is bent into an L shape when viewed from the end, and one outer surface is fixed to the battery holding bracket 150 and the inner surface is in contact with the upper edge of the battery. The battery displacement prevention bracket 160 is brought into contact with the edge of the battery 50 facing the upper surface, so that the battery holding bracket 150 is bridged with the upper surface of the battery.

  Then, one end of the rod 170 is connected to both ends of the battery holding bracket 150 and the other end of the rod 170 is hooked in the vicinity of the portion of the vehicle body panel where the battery 50 is placed, and is shown in a screw portion formed at one end of the rod. By tightening the nut, the battery body is pressed against the vehicle body panel by the battery holding bracket 150, and the battery 50 is prevented from being displaced from the vehicle body panel by the battery position deviation prevention bracket 160.

  As shown in FIGS. 1 and 2, the battery state detection sensor 100 includes a shunt resistor 110 including a resistor 111 and bus bars 112 and 113, a printed circuit board 120 on which a microcomputer and a current sensing circuit (not shown) are mounted, and a bus bar. 112 and 113 and a connection part 130 for connecting the printed circuit board 120. The printed circuit board 120 is provided with a signal line connection connector 121 for communicating battery power and measurement information to an in-vehicle electronic unit (not shown). ing. Further, a temperature sensor (not shown) is mounted on the printed circuit board 120.

  The temperature sensor plays a role of performing a correction calculation by measuring the temperature of the battery itself when detecting the degree of charge (State of Charge) of the battery 50 or the deterioration state (State of Health) of the battery 50.

  The printed circuit board 120 that forms the monitoring control unit of the battery state detection sensor device 1 is arranged on the side of the shunt resistor 110 so as not to overlap the shunt resistor 110, and is electrically connected to the shunt resistor 110 by the connection unit 130. Connected to.

  The connecting portion 130 is formed of a thin lead wire, and one end of each is preliminarily welded to the shunt resistor 110. After fixing the printed circuit board 120 to the battery holding bracket 150, the other end is connected to the printed circuit board 120. It is designed to be connected by soldering. In addition, instead of using a lead wire for the connection part 130, you may use wire bonding and a flexible printed wiring board. Furthermore, the connection method of the connection part 130 and the printed circuit board 120 may be not only soldering but also connection by welding or a conductive adhesive.

  A part of the printed circuit board 120, the connecting portion 130, the shunt resistor 110, and the bus bars 112 and 113 are surrounded by resin molds 140 and 141 made of a highly waterproof resin. In particular, the printed circuit board 120 which is a part of the battery state detection sensor device 1 and has a plurality of electronic components mounted thereon and forms a monitoring control unit of the battery state detection sensor device 1 and its connection portion 130 are arranged in the groove 151 of the battery holding bracket 150. And is integrated with the battery holding bracket 150 by a resin mold.

  Further, these electronic components and electrical components are covered with a resin mold 140. Further, the resin mold 140 and the shunt resistor 110 are covered with a cover 180. The cover 180 is made of a heat insulating member such as a resin material having excellent heat insulating properties and insulating properties, and has a simple waterproof property.

  The shunt resistor 110 includes a resistor 111 and bus bars 112 and 113 made of metal such as copper (Cu) welded to both ends thereof. Harness connecting portions 112a and 113a made up of bolt insertion holes are formed at the opposite ends of the welded portions of the bus bars 112 and 113 and the resistors 111, and the harness connecting portions 112a and 113a of the bus bars 112 and 113 are connected to the battery. The position shift prevention bracket 160 is fastened and fixed by a bolt 171 and a nut 172.

  The battery position shift prevention bracket 160 is provided with bases 161 for fixing the battery state detection sensor on both sides of the battery holding bracket 150. The pedestal 161 accommodates a nut 172 that is screwed into the bolt 171. The insulating resin member 162 is disposed on the pedestal 161, and the harness connecting portions 112a and 113a of the shunt resistor 110 are disposed thereon. A cylindrical insulating resin member 163 is inserted into the bolt insertion holes of the harness connection portions 112 a and 113 a of the shunt resistor 110 and the round terminal of the wire harness 10. Further, a washer 173 and a spacer 164 made of an insulating resin material are interposed between the round terminal of the wire harness 10 and the bolt 171, and the bolt 171 and the nut 172 are sandwiched between the bolt 171 and the spacer 164. To be tightened. As a result, the harness connecting portions 112a and 113a of the shunt resistor 110 can be firmly fixed to the base 161 of the battery displacement prevention bracket 160 together with the round terminals of the wire harness 10 while performing torque management of the bolt tightening force. The metal bolts 171, nuts 172, washers 173 and the shunt resistor 110 are electrically insulated via insulating resin members 162, 163 and spacers 164.

  Moreover, the other end of the first wire harness 11 having one end connected to the battery state detection sensor 100 is connected to the negative terminal 51 of the battery. The first wire harness 11 has such a length that the battery state detection sensor 100 can be attached to an appropriate position of the battery mounting bracket 15 of the battery 50.

  On the other hand, the second wire harness 12 having one end connected to the battery state detection sensor 100 is grounded at the other end of the vehicle body panel itself of the vehicle and the ground line of the electrical junction box.

  When the battery state detection sensor device 1 according to the first embodiment has such a configuration, the following effects are exhibited.

  Since the harness connecting portions 112a and 113a of the bus bars 112 and 113 are firmly fixed to the battery displacement prevention bracket 160 with bolts 171 and nuts 172, wire harnesses connected to the bus bars 112 and 113 of the shunt resistor 110 are connected. For example, even if the cable 10 is pulled during wiring of the harness when the vehicle is assembled, or is shaken by vibration during traveling of the vehicle, the tensile force and vibration are applied to the battery misalignment prevention bracket 160 and the shunt resistor 110 by the fixing portion. Since all are received, excessive stress is not generated in the welded portion of the resistor 111 of the shunt resistor 110 and the bus bars 112 and 113, and this welded portion can be protected.

  In addition, by fixing the ends of the bus bars 112 and 113 of the shunt resistor 110 to the battery misalignment prevention bracket 160, the shunt resistor 110 can be reliably prevented from being misaligned, and the resistor 111 and the bus bars 112 and 113 can be prevented from being displaced. The weld can be protected.

  In addition, a printed circuit board 120 that forms a monitoring control unit, which is an important part of the battery state detection sensor device 1, is resin-molded in the groove 151 of the battery holding bracket 150 and accommodated integrally. Since the battery holding bracket 150 is made of a long and narrow metal plate that is bent into a U-shape when viewed from the end, the battery holding bracket 150 has sufficient strength and rigidity. Accordingly, the battery holding bracket 150 serves as a strong case surrounding the printed circuit board 120 to mechanically protect the printed circuit board 120 and prevent the printed circuit board 120 from being affected by noise. it can.

  Moreover, since the periphery of the battery state detection sensor 100 is covered with the cover 180 made of an insulating member, the battery state detection sensor 100 itself can be protected from an external impact.

  Subsequently, a second embodiment of the present invention will be described. In addition, about the structure equivalent to the above-mentioned embodiment, a corresponding code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  The battery state detection sensor device which is a current sensor device according to the second embodiment of the present invention is similar to the battery state detection device according to the first embodiment, and is a battery state detection sensor device including a shunt resistor. The shunt resistor is composed of a metal bus bar welded to both ends of the shunt resistor and the shunt resistor, and a harness connection portion is formed at the end of each bus bar opposite to the welded portion with the shunt resistor. The harness connecting portion of the bus bar is detachably attached to the battery mounting bracket.

  FIG. 4 is a plan view of the battery state detection sensor device 2 according to the second embodiment of the present invention. FIG. 5 is a front view of the battery state detection sensor device 2 shown in FIG. 6 is an end view of the battery state detection sensor device 2 shown in FIG. FIG. 7 is a perspective view of a battery mounting bracket 25 for detachably mounting the battery state detection sensor device 2 shown in FIG. FIG. 8 is a plan view of the battery mounting bracket 25 shown in FIG. In FIGS. 4 to 6 according to the second embodiment, the connection relationship between the wire harness and the bus bars 212 and 213 of the shunt resistor 210 is the same as that of the first embodiment, and is not shown.

  Since the basic configuration of the battery state detection sensor device 2 is the same as that of the first embodiment described above, detailed description thereof is omitted. The difference from the first embodiment is that the lower surface corresponding to both ends of the bus bars 212 and 213 of the battery state detection sensor device 2 (the end opposite to the side that is welded to the shunt resistor) is shown in FIGS. As shown, the bus bars 212 and 213 are bent in an L shape when viewed from the end, and have a protrusion 175 that latches with the bracket side engaging portion 270 of the battery position shift prevention bracket 260 on the inner side in the vicinity of the front end portion. Sensor side latch engaging portions 179 are provided.

  Also, in the vicinity of both ends of one of the battery position deviation prevention brackets 260, as shown in FIGS. 7 and 8, bracket side latch engagement portions 270 that engage with the sensor side latch engagement portions 179 respectively hold the battery holding bracket 250. It is sandwiched between. The bracket side latch engaging portion 270 has a box shape, has an opening 271 for the sensor side latch engaging portion 179 to enter, and has a cantilever shape extending from the opposite side to the opening 271 on the upper side. A latch portion 272 having flexibility is provided. An engagement hole 275 that engages the protrusion 175 of the sensor side latch engagement portion 179 is provided near the tip of the latch portion 272.

  Both engaging portions 179 and 270 are made of resin or metal suitable for detachably engaging with each other.

  The printed circuit board 220 is molded with resin as in the first embodiment, but is not integrally molded in the groove of the battery holding bracket 250, and the lower side of the mold portion of the printed circuit board 220. An insert mold 241 having a rectangular shape in front view and having an outer diameter dimension that can be inserted into the groove is formed.

  On the other hand, unlike the first embodiment, a part of each of the bus bars 212 and 213 of the shunt resistor 210 is provided with at least one notch 212b and 213b, and the shunt resistor 210 and the bus bars 212 and 213 are provided. A portion including the notches 212b and 213b is housed in a case 240 made of an insulating member such as a resin in a state in which it is insert-molded integrally with resin.

  Since the battery state detection sensor device 2 according to the second embodiment of the present invention has such a configuration, the battery state detection sensor device 2 according to the first embodiment described above has the same operation. That is, since the harness connecting portions 212a and 213a of the bus bars 212 and 213 are attached to the battery displacement prevention bracket 260, the wire harness connected to each of the bus bars 212 and 213 of the shunt resistor 210 is, for example, when the vehicle is assembled. Even when the harness is pulled during wiring or due to vibration while the vehicle is running, excessive stress due to the tension or vibration of the harness is generated in the shunt resistor 211 of the shunt resistor 210 and the welded portion of the bus bars 212 and 213. Without this, the weld can be protected.

  Further, by engaging the end portions of the bus bars 212 and 213 of the shunt resistor 210 with the battery displacement prevention bracket 260, the displacement of the shunt resistor 210 is surely prevented, and the shunt resistor 211 and the bus bars 212 and 213 are It is possible to protect the welded part.

  In addition, since the printed circuit board 220 forming the monitoring control unit, which is an important part of the battery state detection sensor device 2, is accommodated in the groove of the battery holding bracket 250, the battery holding bracket 250 serves as a strong case for the printed circuit board 220. Thus, the printed circuit board 220 is mechanically protected and the printed circuit board 220 is not affected by noise.

  Moreover, the battery state detection sensor itself can be reliably protected by covering the periphery of the battery state detection sensor 200 with the cover 280 made of an insulating member.

  In addition to the above action, the battery state detection sensor 200 and the battery position deviation prevention bracket 260 are provided with an engaging portion that detachably engages the battery state detection sensor 200 with the battery mounting bracket 25. The convenience of attaching and detaching the battery state detection sensor device 2 to the battery mounting bracket 25 can be achieved.

  Further, a part of each bus bar 212, 213 of the shunt resistor 210 is provided with a notch 212b, 213b, and a portion including the shunt resistor 200 and the notches 212b, 213b of the bus bar 212, 213 is provided. By integrally molding with the resin, there is no possibility that the mold part will be peeled off from the bus bars 212 and 213 due to vibrations when the vehicle is running, etc., it is possible to achieve waterproofing, dustproofing, and protection from foreign matters from the outside.

  In the above-described embodiment, a structure has been introduced in which a high-performance type battery state detection sensor device that measures the current, impedance, and temperature of the battery and correctly diagnoses the state of the battery is attached to the battery mounting bracket. Needless to say, a current sensor that detects only the battery current may be applied to the present invention.

It is a top view of the battery state detection sensor apparatus which concerns on 1st Embodiment of the current sensor apparatus which concerns on this invention. FIG. 2 is a cross-sectional view in the longitudinal direction of the harness of the battery state detection sensor device shown in FIG. 1. It is a perspective view which shows the state which attached the battery state detection sensor apparatus shown in FIG. 1 to the battery mounted in the engine room of the vehicle. It is a top view of the battery state detection sensor apparatus which concerns on the 2nd Embodiment of this invention. It is a side view of the battery state detection sensor apparatus shown in FIG. FIG. 5 is an end view of the battery state detection sensor device shown in FIG. 4. It is a perspective view of the battery mounting bracket which attaches the battery state detection sensor apparatus shown in FIG. 4 detachably. FIG. 8 is a plan view of the battery mounting bracket shown in FIG. 7.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Battery state detection sensor apparatus 2 Battery state detection sensor apparatus 10 Wire harness 11 1st wire harness 12 2nd wire harness 15, 25 Battery mounting bracket 50 Battery 51 Negative side terminal 100 Battery state detection sensor 110 Shunt resistor 111 Resistance Body 112, 113 Bus bar 112a, 113a Harness connecting part 120 Printed circuit board 121 Signal line connecting connector 130 Connecting part 140, 141 Resin mold 150 Battery holding bracket 151 Groove part 160 Battery misalignment prevention bracket 161 Base 162 Insulating resin member 163 Insulating resin member 164 Spacer 170 Rod 171 Bolt 172 Nut 173 Washer 175 Protruding part 179 Sensor side latch engaging part 180 Cover DESCRIPTION OF SYMBOLS 200 Battery state detection sensor 210 Shunt resistor 211 Shunt resistance 212,213 Bus bar 212a, 213a Harness connection part 212b, 213b Notch 220 Printed circuit board 240 Case 241 Insert mold 250 Battery holding bracket 260 Battery position shift prevention bracket 270 Bracket side engagement Part 271 opening 272 latch part 275 engagement hole 280 cover

Claims (6)

In a current sensor device with a shunt resistor,
The shunt resistor is composed of a shunt resistor and a metal bus bar welded to both ends of the shunt resistor,
A harness connection part is formed at the end opposite to the welded part with the shunt resistor of each bus bar,
Harness connection portion of the bus bar is a fixed Ru current sensor apparatus to the battery mounting bracket,
The current sensor device , wherein the harness connecting portion and the bracket are provided with an engaging portion for detachably engaging the harness connecting portion with the battery mounting bracket . The battery mounting bracket includes a battery holding bracket having a U-shaped groove section and a battery misalignment prevention bracket fixed to the battery holding bracket, and the harness connecting portion of the shunt resistor has the battery misalignment. The current sensor device according to claim 1, wherein the current sensor device is fixed to a prevention bracket . The current sensor device according to claim 2 , wherein a part of the current sensor device is housed in a groove of the battery holding bracket . The current sensor device according to claim 3 , wherein a portion of the current sensor device housed in the groove of the battery holding bracket is a monitoring control unit of the current sensor device. A part of each bus bar of the shunt resistor is provided with at least one notch, and the part including the notch of the shunt resistor and the bus bar is integrally molded with resin. The current sensor device according to any one of claims 1 to 4 . The current sensor device according to any one of claims 1 to 5 , wherein the current sensor device is covered with a cover made of an insulating member .

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