WO2023135977A1

WO2023135977A1 - Current detecting device, and method for manufacturing same

Info

Publication number: WO2023135977A1
Application number: PCT/JP2022/044825
Authority: WO
Inventors: 一裕原; 裕小澤; 正樹北川
Original assignee: Koa株式会社
Priority date: 2022-01-14
Filing date: 2022-12-06
Publication date: 2023-07-20
Also published as: JP2023103546A

Abstract

The present invention relates to a current detecting device and a method for manufacturing the same, and more particularly relates to a current detecting device provided with a shunt resistor, and a method for manufacturing the current detecting device. A current detecting unit (2) comprises: a plurality of pairs of voltage detection contacts (8A to 8H) electrically connected to a pair of electrodes (6, 7) of a shunt resistor (1); a plurality of pairs of voltage signal lines (9A to 9H) connected respectively to the plurality of voltage detection contacts (8A to 8H); a plurality of pairs of conductor element connection terminals (15A to 15H) connected respectively to the plurality of pairs of voltage signal lines (9A to 9H); and a pair of conductor elements (20, 21) attached to any one pair of conductor element connection terminals among the plurality of pairs of conductor element connection terminals (15A to 15H). The pair of conductor element connection terminals is selected in advance on the basis of an actual measurement result of a temperature coefficient of resistance of the shunt resistor (1).

Description

Current detection device and manufacturing method thereof

The present invention relates to a current detection device and its manufacturing method, and more particularly to a current detection device having a shunt resistor and a current detection device manufacturing method.

Shunt resistors are widely used for current sensing applications. A shunt resistor is required to have a temperature coefficient of resistance (TCR) as close to zero as possible in order to enable current detection that is less affected by temperature fluctuations. The temperature coefficient of resistance (TCR) is an index that indicates the rate of change in resistance due to temperature change. As the temperature coefficient of resistance (TCR) approaches zero, the change in resistance decreases. To improve the TCR of a shunt resistor, a low TCR alloy, such as Manganin®, is sometimes used as the resistor material.

A current detection device equipped with a shunt resistor is used in various applications such as inverter devices, converter devices, electric vehicle battery monitoring BMS (Battery Management System), and power grid energy storage device BSS (Battery Storage System). In particular, for battery energy storage monitoring applications, initial measurement accuracy (shipment adjustment accuracy), measurement accuracy for temperature fluctuations, and measurement accuracy for aging are more important than other applications. The current sensing device influences the battery capacity design required for the overall system and drives the system cost. Therefore, the current detection device is required to have high measurement accuracy over a wide range of current.

Japanese Patent Publication No. 2003-518763

The current detection board detects current by measuring the voltage drop at the voltage measurement position of the shunt resistor. In order to achieve a shunt resistor with a TCR as close to zero as possible, the voltage measurement positions of the shunt resistor are theoretically determined by simulation. However, shunt resistors have slight differences in their dimensions, slight differences in material composition, and differences in mounting position of the current detection substrate. Such discrepancies cause discrepancies between the theoretical voltage measurement position and the actual optimum position, resulting in reduced current measurement accuracy.

Therefore, the present invention provides a current detection device capable of bringing the actual temperature coefficient of resistance (TCR) close to 0 and improving the accuracy of current measurement.

In one aspect, it comprises a shunt resistor having a resistor and a pair of electrodes connected to both sides of the resistor, and a current detection unit electrically connected to the shunt resistor, wherein the current detection unit includes the a plurality of pairs of voltage detection contacts electrically connected to a pair of electrodes; a plurality of pairs of voltage signal wirings respectively connected to the plurality of pairs of voltage detection contacts; and a plurality of pairs of voltage signal wirings respectively connected to the plurality of pairs of voltage detection contacts. a plurality of pairs of conductor element connection terminals; and a pair of conductor elements attached to any one pair of the conductor element connection terminals of the plurality of pairs of conductor element connection terminals, wherein the pair of conductor element connection terminals are connected to the shunt. A current sensing device is provided that has been preselected based on actual measurements of the temperature coefficient of resistance of the resistor.

In one aspect, the preselected pair of conductive element connection terminals are electrically connected to a pair of voltage detection contacts in which the temperature coefficient of resistance of the shunt resistor is closest to 0 among the plurality of pairs of voltage detection contacts. It is
In one aspect, the plurality of pairs of voltage sensing contacts are arranged along opposite sides of the resistor.
In one aspect, the current detector includes a base plate and a plurality of pairs of through holes extending through the base plate, and the plurality of pairs of through holes are provided on the plurality of pairs of voltage signal wirings. and located between the plurality of pairs of voltage sensing contacts and the plurality of pairs of conductive element connecting terminals.
In one aspect, the plurality of pairs of conductive element connecting terminals are arranged on the front side of the base plate, and the plurality of pairs of voltage detection contacts are arranged on the back side of the base plate.
In one aspect, the plurality of pairs of voltage sensing contacts comprise a pair of contact pads surface-connected to the pair of electrodes.
In one aspect, the pair of contact pads are positioned adjacent opposite sides of the resistor of the shunt resistor, and the pairs of voltage signal wires are connected to inner edges of the pair of contact pads. ing.
In one aspect, the shunt resistor has a projection projecting in its width direction, a part of the resistor and a part of the pair of electrodes constitute the projection, and the pair of A contact pad is surface-connected to a portion of the pair of electrodes forming the protrusion.
In one aspect, the pair of conductive elements is a pair of resistors.

In one aspect, a shunt resistor and a current sensing portion are manufactured, the shunt resistor having a resistor and a pair of electrodes connected to opposite sides of the resistor, the current sensing portion comprising a plurality of pairs of electrodes. voltage detection contacts, a plurality of pairs of voltage signal wirings respectively connected to the plurality of pairs of voltage detection contacts, and a plurality of pairs of conductor element connection terminals respectively connected to the plurality of pairs of voltage signal wirings, A pair of conductors preselected from the plurality of pairs of conductor element connection terminals, electrically connecting the plurality of pairs of voltage detection contacts to the pair of electrodes, and based on an actual measurement result of the temperature coefficient of resistance of the shunt resistor. A method for manufacturing a current detection device is provided, in which a pair of conductor elements are attached to element connection terminals.
In one aspect, mounting the pair of conductive elements is electrically connected to a pair of voltage sensing contacts in which the temperature coefficient of resistance of the shunt resistor is closest to 0 among the plurality of pairs of voltage sensing contacts. It is to attach a pair of conductor elements to a pair of conductor element connection terminals.

According to the present invention, since a plurality of pairs of voltage detection contacts are provided in contact with the electrodes of the shunt resistor, the conductor is connected to the conductor element connection terminal corresponding to the voltage detection contact whose temperature coefficient of resistance of the shunt resistor is closest to zero. element can be attached. In particular, by determining the voltage detection contact with the temperature coefficient of resistance of the shunt resistor that is closest to 0 based on the actual measurement result of the temperature coefficient of resistance, a current detection device with excellent temperature characteristics and high measurement accuracy is provided. can be done.

1 is a plan view schematically showing one embodiment of a shunt resistor; FIG. 2 is a perspective view of the shunt resistor shown in FIG. 1; FIG. FIG. 2 is a perspective view showing an embodiment of a current detection device including the shunt resistor shown in FIG. 1 and a current detection section arranged on the shunt resistor; FIG. 4 is a plan view of the current detection device shown in FIG. 3; FIG. 4 is a plan view showing one embodiment of a current detection section electrically connected to a shunt resistor; FIG. 6 is a cross-sectional view taken along line AA of FIG. 5; 7 is a graph showing simulation results of the rate of change in resistance value of a shunt resistor due to temperature changes. 4 is a flow chart for explaining an embodiment of a method for manufacturing a current detection device; FIG. 4 is a perspective view showing another embodiment of a shunt resistor that constitutes a current detection device; FIG. 10 is a plan view showing one embodiment of a current detection section electrically connected to the shunt resistor shown in FIG. 9; 11 is a perspective view showing a current detection device in which the current detection unit shown in FIG. 10 is connected to the shunt resistor shown in FIG. 9; FIG. FIG. 11 is a perspective view showing still another embodiment of a shunt resistor that constitutes a current detection device; 13 is a perspective view showing a current detection device in which the current detection unit shown in FIG. 10 is connected to the shunt resistor shown in FIG. 12; FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view schematically showing one embodiment of the shunt resistor, and FIG. 2 is a perspective view of the shunt resistor shown in FIG. As shown in FIGS. 1 and 2, the shunt resistor 1 includes a resistor 5 having a predetermined thickness and width, and a pair of electrodes 6 made of highly conductive metal connected to both

sides

5a and 5b of the resistor 5. , 7. Specifically, the electrode 6 is connected to one side 5 a of the resistor 5 , and the electrode 7 is connected to the other side 5 b of the resistor 5 . The configuration of the electrode 7 is the same as that of the electrode 6 , and the

electrodes

6 and 7 are arranged symmetrically with respect to the resistor 5 .

Examples of materials for the resistor 5 include alloys such as copper-nickel alloys, copper-manganese alloys, iron-chromium alloys, and nickel-chromium alloys. An example of a highly conductive metal forming the

electrodes

6 and 7 is copper (Cu). Both

sides

5a and 5b of the resistor 5 are connected (bonded) to

electrodes

6 and 7 by welding (for example, electron beam welding, laser beam welding, or brazing).

In this embodiment, the resistor 5 is thinner than the

electrodes

6 and 7, and the front surface of the resistor 5 is lower than the front surfaces of the

electrodes

6 and 7. However, in one embodiment, the thickness of the resistor 5 may be the same as the thickness of the

electrodes

6,7. The shunt resistor 1 has a projecting portion 11 projecting in its width direction. More specifically, a portion of the resistor 5 and a portion of the pair of

electrodes

6 and 7 form a projecting portion 11 . The projecting portion 11 has a rectangular shape when viewed from above.

FIG. 3 is a perspective view showing an embodiment of a current detection device comprising the shunt resistor 1 shown in FIG. 1 and a current detection section 2 arranged on the shunt resistor 1, and FIG. 3 is a plan view of the current detection device shown in FIG. A part of the pair of

electrodes

6 and 7 forming the projecting portion 11 is electrically connected to the current detecting portion 2 as described later. The current detector 2 has a base plate 3 on which an amplifier 31, an arithmetic device 33, and the like are arranged. This base plate 3 is fixed to the

electrodes

6 and 7 of the shunt resistor 1 .

FIG. 5 is a plan view showing an embodiment of the current detector 2 electrically connected to the shunt resistor 1. FIG. As shown in FIG. 5, the current detection unit 2 includes a plurality of pairs of voltage detection contacts 8A to 8H, a plurality of pairs of voltage signal wirings 9A to 9H respectively connected to the plurality of pairs of voltage detection contacts 8A to 8H, and a plurality of A plurality of pairs of conductor element connection terminals 15A to 15H respectively connected to the pairs of voltage signal wirings 9A to 9H and a pair of conductor element connection terminals among the plurality of pairs of conductor element connection terminals 15A to 15H.

Conductive elements

20, 21 are provided.

The voltage detection contacts 8A to 8H, voltage signal wirings 9A to 9H, and conductor element connection terminals 15A to 15H are arranged on the base plate 3. Examples of the material of the base plate 3 include resin such as glass epoxy. A plurality of pairs of voltage sensing contacts 8A-8H are electrically connected to a pair of

electrodes

6, 7 of the shunt resistor 1 when the base plate 3 is fixed to the shunt resistor 1. As shown in FIG.

A plurality of pairs of voltage detection contacts 8A to 8H are arranged along both

sides

5a and 5b of the resistor 5 of the shunt resistor 1. Therefore, the distances from the end surfaces 6a, 7a of the

electrodes

6, 7 to the plurality of pairs of voltage detection contacts 8A-8H are different. Although four pairs of voltage sensing contacts 8A-8H are provided in this embodiment, five or more pairs of voltage sensing contacts may be provided. Alternatively, 2-3 pairs of voltage sensing contacts may be provided.

In this embodiment, the plurality of pairs of voltage detection contacts 8A-8H are composed of a pair of

contact pads

25, 26 surface-connected to a pair of

electrodes

6, 7. More specifically, the pair of

contact pads

25 and 26 are connected to part of the

electrodes

6 and 7 forming the projecting portion 11, and the plurality of pairs of voltage detection contacts 8A to 8H are connected to the

contact pads

25 and 26. It consists of each part. Therefore, the plurality of pairs of voltage detection contacts 8A-8H are electrically connected to part of the

electrodes

6, 7 forming the projecting portion 11. As shown in FIG. In one embodiment,

contact pads

25, 26 may not be provided and multiple pairs of voltage sensing contacts 8A-8H may be separately connected to pairs of

electrodes

6,7. In this embodiment, the pair of

contact pads

25, 26 are surface-connected to the pair of

electrodes

6, 7 by means of soldering or the like.

By surface-connecting the pair of

contact pads

25 and 26 to the pair of

electrodes

6 and 7, an electrical connection between the current detector 2 and the shunt resistor 1 is established. A pair of

contact pads

25, 26 are positioned adjacent

opposite sides

5a, 5b of the resistor 5 of the shunt resistor 1, and multiple pairs of voltage signal wires 9A-9H connect the pair of

contact pads

25, 26. connected to the inner edge. Thus, multiple pairs of voltage sensing contacts 8A-8H are formed from the inner edges of a pair of

contact pads

25, 26, and these voltage sensing contacts 8A-8H are electrically connected to the inner edges of

electrodes

6,7. . In this way, since the multiple pairs of voltage detection contacts 8A-8H are located near the resistor 5 of the shunt resistor 1, the current measurement accuracy is less affected by the resistance of the

electrodes

6 and 7 themselves.

In this embodiment, the multiple pairs of voltage detection contacts 8A to 8H are electrically connected to a part of the

electrodes

6 and 7 forming the projecting portion 11. The shunt resistor 1 has a projecting portion 11 composed of a part of the resistor 5 and a part of the

electrodes

6 and 7, so that the potential of the

electrodes

6 and 7 of the projecting portion 11 changes even if the temperature changes. It is known from simulation results and actual measurement results that the temperature coefficient of resistance of the shunt resistor 1 approaches zero when a voltage is detected at a position where there is no resistance.

The current detector 2 has a plurality of pairs of through holes 30A-30H extending through the base plate 3. These through holes 30A-30H are provided on the voltage signal wirings 9A-9H, respectively, and located between the voltage detection contacts 8A-8H and the conductor element connection terminals 15A-15H. One ends of the voltage signal wirings 9A-9H are connected to the voltage detection contacts 8A-8H, respectively, and the other ends of the voltage signal wirings 9A-9H are connected to the conductive element connecting terminals 15A-15H, respectively.

The voltage detection contacts 8A to 8H are arranged on the back side of the base plate 3, and the conductor element connection terminals 15A to 15H are arranged on the front side of the base plate 3. The through holes 30A-30H extend from the back side to the front side of the base plate 3, and the voltage signal wirings 9A-9H extend from the back side to the front side of the base plate 3 via the through holes 30A-30H.

FIG. 6 is a cross-sectional view along line AA in FIG. As shown in FIG. 6, the through

holes

30C and 30D extend from the back side to the front side of the base plate 3, and the

voltage signal wirings

9C and 9D are connected from the

voltage detection contacts

8C and 8D on the back side of the base plate 3. It extends to the front side of the base plate 3 via the through

holes

30C and 30D. As can be seen from FIG. 6, the front surface of the resistor 5 of the shunt resistor 1 is positioned lower than the front surfaces of the

electrodes

6 and 7, and the resistor 5 has through

holes

30C and 30D and

voltage signal wirings

9C and 9D. do not come into contact with Although not shown, the arrangement of voltage detection contacts 8A-8B, 8E-8H, voltage signal wirings 9A-9B, 9E-9H, and through holes 30A-30B, 30E-30H are the same.

Returning to FIG. 5, the current detection unit 2 includes an amplifier 31 that amplifies the voltage signal extracted through the voltage signal wirings 9A to 9H, an A/D converter 32 that converts the amplified voltage signal into a digital signal, and a digital signal. Further provided is an arithmetic device 33 (for example, a small computer) for receiving and calculating a current value, and a connector 34 for outputting the current value from the current detector 2 . In one embodiment, the current detector 2 may further include a temperature sensor or the like.

A plurality of pairs of conductor element connection terminals 15A to 15H are connected to an amplifier 31 through a pair of

wirings

35,36. One ends of the conductor element connection terminals 15A to 15H are connected to the corresponding voltage signal wirings 9A to 9H, respectively, and the other ends of the conductor element connection terminals 15A to 15H are connected to the

wirings

35 and 36. ing. A capacitor 37 is arranged between the

wirings

35 and 36 .

Each pair of the conductor element connection terminals 15A to 15H is composed of two electrically separated terminals, and when the

conductor elements

20 and 21 are attached to any pair of the conductor element connection terminals, the conductors of the pair are connected. An electrical connection is established between the element connection terminals. In the example shown in FIG. 5, the

conductive elements

20, 21 are attached to the conductive

element connection terminals

15E, 15F to establish the electrical connection of the conductive

element connection terminals

15E, 15F.

The pair of

voltage detection contacts

8E, 8F are connected to an amplifier 31 that amplifies the voltage signal between the pair of

voltage detection contacts

8E, 8F, and the amplifier 31 is an A/D converter that converts the amplified voltage signal into a digital signal. 32 , the A/D converter 32 is connected to an arithmetic device 33 for calculating a current value from the digital signal, and the arithmetic device 33 is connected to a connector 34 for outputting the current value from the current detector 2 . Thereby, the current value can be output from the current detection unit 2 . In one embodiment, the shunt resistor 1 or its ambient temperature may be measured by a temperature sensor, and the arithmetic unit 33 may calculate the current value after correction.

Examples of the

conductor elements

20 and 21 include a resistor having a resistance value higher than 0 (for example, 10Ω) and a jumper resistor having a resistance value of substantially 0.

The pair of

conductor elements

20 and 21 are attached to a pair of conductor

element connection terminals

15E and 15F selected in advance based on the actual measurement result of the temperature coefficient of resistance of the shunt resistor 1. More specifically, the preselected pair of conductive

element connection terminals

15E and 15F is the pair of voltage detection contacts 8A to 8H whose temperature coefficient of resistance (TCR) of the shunt resistor 1 is closest to 0. are electrically connected to the

voltage detection contacts

8E and 8F of the . The temperature coefficient of resistance (TCR) of the shunt resistor 1 being closest to zero also includes the temperature coefficient of resistance (TCR) of the shunt resistor 1 being zero.

FIG. 7 is a graph showing simulation results of the rate of change in the resistance value of the shunt resistor 1 due to temperature changes. In FIG. 7 , the vertical axis represents the change rate of the resistance value of the shunt resistor 1 and the horizontal axis represents the temperature of the shunt resistor 1 . As can be seen from FIG. 7, the slope of the rate of change of the resistance value, ie the temperature coefficient of resistance (TCR), changes depending on the positions of the voltage detection contacts 8A to 8H. The shunt resistor 1 is required to have a constant resistance value regardless of changes in temperature, that is, to have a temperature coefficient of resistance (TCR) as close to zero as possible.

According to the simulation results shown in FIG. 7, the temperature coefficient of resistance (TCR) of the shunt resistor 1 at the

voltage detection contacts

8E and 8F is closest to 0. Accordingly, when the

conductive elements

20, 21 are attached to the conductive

element connection terminals

15E, 15F electrically connected to the

voltage detection contacts

8E, 8F, it is expected that a good temperature coefficient of resistance (TCR) can be achieved.

On the other hand, shunt resistors can have slight differences in dimensions, slight differences in material composition, and differences in the mounting position of the current detection unit 2 . Such a difference causes a difference between the theoretical voltage measurement position obtained from the simulation results and the actual optimum position.

Therefore, in the following manner, before attaching the

conductor elements

20 and 21, the rate of change in the resistance value of the shunt resistor 1 due to temperature changes, that is, the temperature coefficient of resistance (TCR) is actually measured. to determine the voltage detection contact whose temperature coefficient of resistance is closest to 0, that is, the conductive element connecting terminal to which the

conductive elements

20 and 21 should be attached. The temperature coefficient of resistance (TCR) is measured after the shunt resistor 1 and the current detector 2 are electrically connected.

First, based on the simulation results, the temperature coefficient of resistance of the shunt resistor 1 at the

voltage detection contacts

8E and 8F where the best temperature coefficient of resistance was obtained is measured. Specifically, the sense wires (not shown) of the ohmmeter are electrically connected to the through

holes

30E, 30F or the conductor

element connection terminals

15E, 15F by a pin board or the like, and the

electrodes

6, 7 of the shunt resistor 1 A probe or the like is used to connect the force line (not shown) of the ohmmeter. The temperature of the shunt resistor 1 is set to a reference temperature (for example, 25° C.), and the resistance value is measured with an ohmmeter. The temperature of the shunt resistor 1 is set to the test temperature (for example, 150° C.) and the resistance value is measured with an ohmmeter. Calculate the temperature coefficient of resistance from the reference temperature, the test temperature, and the resistance value at each temperature.

If the measurement results of the temperature coefficient of resistance substantially match the simulation results, the mounting positions of the

conductor elements

20 and 21 are determined to the conductor

element connection terminals

15E and 15F. If the measured result of the temperature coefficient of resistance is significantly different from the simulation result, measure the temperature coefficient of resistance of the other voltage detection contacts in the same manner in turn. Then, the conductive element connecting terminal connected to the voltage detection contact that has the best (that is, closest to 0) temperature coefficient of resistance is determined as the mounting position of the

conductive elements

20 and 21 .

It is possible that the current detection unit 2 is angularly displaced with respect to the shunt resistor 1. In such a case, for example, in FIG. 5, the conductor element 20 may be attached to the conductor element connection terminal 15E and the other conductor element 21 may be attached to the conductor

element connection terminal

15D or 15H.

FIG. 8 is a flow chart for explaining an embodiment of the method for manufacturing the current detection device described above.
In step 1, the shunt resistor 1 and the current detector 2 are manufactured. As mentioned above, the shunt resistor 1 has a resistor 5 and a pair of

electrodes

6, 7 connected to

opposite sides

5a, 5b of the resistor 5. As shown in FIG. The current detection unit 2 includes a plurality of pairs of voltage detection contacts 8A to 8H, a plurality of pairs of voltage signal wirings 9A to 9H respectively connected to the plurality of pairs of voltage detection contacts 8A to 8H, and a plurality of pairs of voltage signal wirings 9A to 8H. It has a plurality of pairs of conductor element connection terminals 15A-15H each connected to 9H.

In step 1 above, the shunt resistor 1 and the current detection unit 2 may be manufactured at the same time, or the shunt resistor 1 may be manufactured first and the current detection unit 2 may be manufactured later, or the current detection unit 2 may be manufactured later. The detector 2 may be manufactured first, and the shunt resistor 1 may be manufactured later.

In step 2 , the current detection section 2 is electrically connected to the shunt resistor 1 . More specifically, a plurality of pairs of voltage detection contacts 8A-8H are electrically connected to a pair of

electrodes

6,7.
In step 3, a pair of

conductor elements

20 and 21 are connected to a pair of conductor element connection terminals selected in advance from the plurality of pairs of conductor element connection terminals 15A to 15H based on the actual measurement result of the temperature coefficient of resistance of the shunt resistor 1. Install. More specifically, among the plurality of pairs of voltage detection contacts 8A to 8H, the conductive element connection terminal electrically connected to the pair of voltage detection contacts in which the temperature coefficient of resistance of the shunt resistor 1 is closest to 0, A pair of

conductor elements

20, 21 are attached.

As described below, the configuration of the voltage detection contacts 8A-8H is not limited to the embodiment using the

contact pads

25, 26 shown in FIG. FIG. 9 is a perspective view showing another embodiment of the shunt resistor 1 that constitutes the current detection device, and FIG. 10 shows a part of the current detection section 2 electrically connected to the shunt resistor 1 shown in FIG. 11 is a plan view showing an embodiment, and FIG. 11 is a perspective view showing a current detection device in which a current detection part 2 shown in FIG. 10 is connected to the shunt resistor 1 shown in FIG. 9. FIG. The configurations and operations of the embodiment shown in FIGS. 9 to 11 that are not particularly described are the same as those of the embodiment described with reference to FIGS. 1 to 7, so redundant description thereof will be omitted.

The shunt resistor 1 of the embodiment shown in FIG. 9 does not have the projecting portion 11 as shown in FIG. Further, as shown in FIG. 10, the current detection section 2 of the present embodiment does not have the

contact pads

25 and 26 shown in FIG. there is A plurality of pairs of voltage detection contacts 8A to 8H are formed of through holes penetrating through the base plate 3 from the back side to the front side. The fact that these multiple pairs of voltage detection contacts 8A to 8H are arranged along both

sides

5a and 5b of the resistor 5 is the same as in the embodiment shown in FIG. An electrical connection between the current detection device and the shunt resistor 1 is established by connecting a plurality of pairs of voltage detection contacts 8A-8H to a pair of

electrodes

6,7.

12 and 13 are diagrams showing still another embodiment of the current detection device. More specifically, FIG. 12 is a perspective view showing still another embodiment of the shunt resistor 1 constituting the current detection device, and FIG. 13 shows the shunt resistor 1 shown in FIG. 2 is a perspective view showing a current detection device to which a current detection section 2 is connected; FIG. The configuration and operation of the embodiment shown in FIGS. 12 and 13 that are not particularly described are the same as those of the embodiment described with reference to FIGS. 1 to 7, so redundant description thereof will be omitted.

As shown in FIG. 12, the shunt resistor 1 has a plurality of pairs of pin terminals 40A-40H fixed to a pair of

electrodes

6,7. These multiple pairs of pin terminals 40A to 40H are arranged along both

sides

5a and 5b of the resistor 5. As shown in FIG. The current detector 2 of this embodiment has the same configuration as the current detector 2 shown in FIG. As shown in FIG. 13, pin terminals 40A to 40H are inserted into voltage detection contacts 8A to 8H formed of through holes, respectively, thereby establishing electrical connection between current detection section 2 and shunt resistor 1. .

The above-described embodiments are described for the purpose of enabling those who have ordinary knowledge in the technical field to which the present invention belongs to implement the present invention. Various modifications of the above embodiments can be made by those skilled in the art, and the technical idea of the present invention can be applied to other embodiments. Accordingly, the present invention is not limited to the described embodiments, but is to be construed in its broadest scope in accordance with the technical spirit defined by the claims.

INDUSTRIAL APPLICABILITY The present invention can be used for a current detection device having a shunt resistor and a method for manufacturing the current detection device.

1 shunt resistor 2 current detection unit 3 base plate 5

resistor

6, 7 electrodes 8A to 8H voltage detection contacts 9A to 9H voltage signal wiring 11 protrusions 15A to 15H conductor

element connection terminals

20, 21

conductor elements

25, 26 contacts Pads 30A to 30H Through hole 31 Amplifier 32 A/D converter 33 Arithmetic unit 34

Connectors

35, 36 Wiring 37 Capacitors 40A to 40H Pin terminals

Claims

a shunt resistor having a resistor and a pair of electrodes connected to opposite sides of the resistor;
A current detection unit electrically connected to the shunt resistor,
The current detection unit is
a plurality of pairs of voltage sensing contacts electrically connected to the pair of electrodes;
a plurality of pairs of voltage signal wires respectively connected to the plurality of pairs of voltage detection contacts;
a plurality of pairs of conductor element connection terminals respectively connected to the plurality of pairs of voltage signal wiring;
a pair of conductor elements attached to one pair of the conductor element connection terminals of the plurality of pairs of conductor element connection terminals;
The current detecting device, wherein the pair of conductive element connecting terminals are selected in advance based on the result of actual measurement of the temperature coefficient of resistance of the shunt resistor.
The pair of preselected conductive element connection terminals are electrically connected to a pair of voltage detection contacts, among the plurality of pairs of voltage detection contacts, for which the temperature coefficient of resistance of the shunt resistor is closest to 0. The current detection device according to claim 1.
The current detection device according to claim 1 or 2, wherein the plurality of pairs of voltage detection contacts are arranged along both sides of the resistor.
The current detection unit is
a base plate;
a plurality of pairs of through holes extending through the base plate;
3. The plurality of pairs of through-holes are provided on the plurality of pairs of voltage signal wires and located between the plurality of pairs of voltage detection contacts and the plurality of pairs of conductive element connection terminals. 4. The current detection device according to any one of 1 to 3.
The current detection device according to claim 4, wherein the plurality of pairs of conductive element connection terminals are arranged on the front side of the base plate, and the plurality of pairs of voltage detection contacts are arranged on the back side of the base plate.
The current detection device according to any one of claims 1 to 5, wherein said plurality of pairs of voltage detection contacts comprise a pair of contact pads surface-connected to said pair of electrodes.
the pair of contact pads are positioned adjacent opposite sides of the resistor of the shunt resistor;
7. The current sensing device of claim 6, wherein said pairs of voltage signal wires are connected to inner edges of said pair of contact pads.
The shunt resistor has a protrusion that protrudes in its width direction, and a part of the resistor and a part of the pair of electrodes constitute the protrusion,
8. The current detection device according to claim 6, wherein said pair of contact pads are surface-connected to a part of said pair of electrodes forming said projecting portion.
The current detection device according to any one of claims 1 to 8, wherein the pair of conductor elements are a pair of resistors.
A shunt resistor and a current sensing section are manufactured, the shunt resistor having a resistor and a pair of electrodes connected to opposite sides of the resistor, the current sensing section comprising a plurality of pairs of voltage sensing contacts. and a plurality of pairs of voltage signal wirings respectively connected to the plurality of pairs of voltage detection contacts, and a plurality of pairs of conductor element connection terminals respectively connected to the plurality of pairs of voltage signal wirings,
electrically connecting the plurality of pairs of voltage sensing contacts to the pair of electrodes;
A method of manufacturing a current detection device, comprising attaching a pair of conductor elements to a pair of conductor element connection terminals preselected from the plurality of pairs of conductor element connection terminals based on the result of actual measurement of the temperature coefficient of resistance of the shunt resistor.
Attaching the pair of conductor elements includes a pair of conductor elements electrically connected to a pair of voltage detection contacts in which the temperature coefficient of resistance of the shunt resistor is closest to 0 among the plurality of pairs of voltage detection contacts. 11. The method of manufacturing the current detection device according to claim 10, wherein the connection terminal is attached with a pair of conductive elements.