KR101725990B1 - Structure of shunt - Google Patents

Structure of shunt Download PDF

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Publication number
KR101725990B1
KR101725990B1 KR1020160059129A KR20160059129A KR101725990B1 KR 101725990 B1 KR101725990 B1 KR 101725990B1 KR 1020160059129 A KR1020160059129 A KR 1020160059129A KR 20160059129 A KR20160059129 A KR 20160059129A KR 101725990 B1 KR101725990 B1 KR 101725990B1
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KR
South Korea
Prior art keywords
shunt
current
coupling groove
coupling
conducting piece
Prior art date
Application number
KR1020160059129A
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Korean (ko)
Inventor
이태훈
이일규
유병길
Original Assignee
주식회사 탑런에너지솔루션
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Priority to KR1020160059129A priority Critical patent/KR101725990B1/en
Application granted granted Critical
Publication of KR101725990B1 publication Critical patent/KR101725990B1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/20—Modifications of basic electric elements for use in electric measuring instruments; Structural combinations of such elements with such instruments
    • G01R1/203—Resistors used for electric measuring, e.g. decade resistors standards, resistors for comparators, series resistors, shunts
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R3/00—Apparatus or processes specially adapted for the manufacture or maintenance of measuring instruments, e.g. of probe tips
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C1/00—Details
    • H01C1/14—Terminals or tapping points or electrodes specially adapted for resistors; Arrangements of terminals or tapping points or electrodes on resistors
    • H01C1/144—Terminals or tapping points or electrodes specially adapted for resistors; Arrangements of terminals or tapping points or electrodes on resistors the terminals or tapping points being welded or soldered

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)

Abstract

The present invention relates to a coupling structure of a shunt which reduces cracks formed between a shunt and a current conducting piece. A shunt coupling groove (13) is formed to be recessed in an end of a current conducting piece (12) coupled to a shunt (11) toward the inside of the current conducting piece, so the shunt (11) is inserted into the shunt coupling groove (13). A side coupling groove (14) penetrating the current conducting piece (12) is formed in a direction perpendicular to a direction in which the shunt coupling groove (13) is formed. So, the shunt and the current conducting piece (12) are coupled through silver soldering in the shunt coupling groove (13) and the side coupling groove (14).

Description

Shunt coupling structure {STRUCTURE OF SHUNT}

The present invention relates to a weld / join structure of a large-capacity shunt.

 The present invention relates to a welding structure of a large-capacity shunt, and a shunt is basically an element used for measuring a current. A shunt is connected to an energizing circuit of an electric / electronic apparatus, The voltage is measured using the resistance value, and the voltage measured across the shunt is measured and converted to the current value to measure the current. At this time, the shunt may also be referred to as a classifier. The shunt is basically a resistor having a sufficiently low resistance as compared with the load. For example, a shunt having a resistance sufficiently lower than that of the motor is connected to the energizing circuit so that the current applied to the motor can be measured , Load voltage measurement and ultimate load current measurement.

The shunt is a standard resistor to extend the current measurement range of the ammeter and is wired with an ammeter to allow the load current to be measured through an ammeter.

 On the other hand, although the secondary battery is not permanent, it can be used by charging current repeatedly. Therefore, a secondary battery is often used as a power source for various electric and electronic devices such as a mobile phone, a PDA, and an MFP 4. For example, By mounting a shunt on the circuit configured for current measurement in the system, the current applied to the secondary battery battery system can be measured through the circuit and shunt. Although the secondary battery is employed in electric and electronic devices such as mobile phones, it is employed as a main power source for a hybrid vehicle or an electric vehicle, so it is important to measure the current for the secondary battery using the shunt.

A battery system used in an electric vehicle or a fuel cell vehicle such as the above-described hybrid vehicle includes a plurality of unit cells (secondary cells) connected in series to generate a voltage and generate high power using the voltage. In order to generate such power, a current of several tens to hundreds of amperes (A) flows through the battery system. As a method of measuring the current of the battery system, there is a method of measuring the current using a shunt resistor. That is, the current measurement can be performed by connecting the shunt to the circuit of the battery system.

On the other hand, the shunt can be regarded as a standard resistor used for current measurement, so that it can be a shunt resistor (standard resistance), so that accurate current measurement can be performed without distortion in current measurement.

 In addition, heat is generated when the current flows through the shunt, and resistance increases when the heat is generated. Therefore, the initial resistance of the shunt and the resistance when the current flow, and the resistance after the shunt are used are not constant, It is important to design such that the resistance characteristic of the shunt is not changed (designed so as not to increase the resistance value).

Therefore, the shunt itself is made of manganese to manganese alloy in order to prevent the change of resistance value of the shunt by heat. That is, a metal such as a common copper increases its resistance when the heat is increased, but the manganese or manganese alloy maintains the resistance characteristic of resistance even when the heat rises, so the shunt is made of manganese or manganese alloy .

In addition, it is common that the resistance value changes by about 10,000 ppm when the resistance heat value increases by about 10 ° C. In the case of the shunt case, the constant current flows only when the heat value is about 15 to 50 ppm per 1 ° C, so that the current measurement accuracy can be guaranteed. If the calorific value changes by 1 ° C and the resistance change value of the shunt is changed to 1% or more based on the total resistance value, the shunt resistor (that is, the standard resistance) can not be used. Shunt can be used when the current change value specification of shunt should be within ± 0.2% ~ 0.5% in the range of 10 ℃ ~ 15 ℃ change of calorific value. When the current change value of the shunt at the low current becomes 1% or more based on the total current value, it can not be used as a shunt. That is, the current change value of the shunt should not be more than 1% at the low current.

1, when a shunt 11 is manufactured, a shunt of a manganese material is bonded to a main body made of copper. At this time, welding is performed using silver or lead, and a current conducting piece 12 made of copper, A straight shunt joint groove 13 was drilled in the body, and silver and lead were used for welding.

However, since the shunt is manufactured in an elongated shape, when a force is applied to one end of the shunt, a torque is applied to the connection portion on the opposite side, and cracks often occur on the welded portion.

However, the contact resistance and the welding strength of the welding portion are also important factors in the performance of the shunt resistor, and the importance of the welding portion is also increased in proportion to the increase of the current. In the conventional method of inserting the manganese, Accordingly, there is a high possibility that cracks are generated on the welded portion, so that the soldering soldering resistance due to the soldering soldering at the welded portion changes, and the overall resistance may change. If the resistance is changed and too much resistance is generated between the shunt and the circuit board, there is a problem that the charging current of the current charging object, for example, the secondary battery is measured to be too small. If it is measured to be too small, the secondary battery to be charged may be charged with an excessive amount of current, resulting in a serious problem such as a secondary battery being blown. An excessively low current value is measured at the time of measuring the current of not only the secondary battery but also other elements or parts, and thus excessive current is charged in other parts or devices other than the secondary battery, thereby causing damage due to overcurrent Serious problems will arise.

Particularly, when cracks are generated in the soldering solder portion of the shunt, the resistance value is increased, and the charge current of the current charge / discharge object (secondary battery, etc.) is measured to be too small. If a crack is released to the soldering solder portion between the shunt and the shunt bracket, the current can not be properly measured due to excessive rise of the resistance value, and the current of the secondary battery can not be properly charged and discharged. As a result, Resulting in discharge.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a bonding method in which cracks are generated between a shunt and a current conducting piece.

In order to achieve the above-mentioned object, the present invention provides a shunt coupling structure in which a shunt coupling groove (13) is formed by being inserted into a current conducting piece at an end of a current conducting piece (12) The side connecting groove 14 is formed in a shape that the shunt is fitted in the shunt connecting groove 13 and penetrates the current conducting piece 12 in the direction perpendicular to the direction in which the shunt connecting groove 13 is formed. And the shunt engaging groove 13 and the side engaging groove 14 are welded by brazing solder so that the shunt and the current conducting piece 12 are engaged with each other.

 The width of the shunt coupling groove is smaller than the width of the current conducting piece 12 so that silver soldering is performed also on the side of the shunt coupling groove and the shunt coupling groove is formed as a closed curve so that the shunt does not fall off to the side

The side coupling grooves are formed in the shape of a closed curve to increase the area of the silver soldering welding portion. When the shunt coupling is performed, the inside of the side coupling grooves are welded by silver soldering, so that the shunt can be coupled to two or more ends of the shunt.

The above-described structure has an effect of providing a shunt coupling structure in which cracks are less likely to occur.

1 is a view showing a conventional shunt coupling structure
2 to 4 are views showing a shunt coupling structure according to the present invention
5 is a view for comparing the structures of the conventional structure and the present invention

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a conventional shunt and a connecting portion of a shunt conductive member. FIG. Conventionally, a groove is formed in the side surface of the current conducting piece 12 to form a shunt engaging groove 13, a shunt 11 is inserted into the shunt engaging groove 13, and the shunt is fixed by soldering.

Since the length of the shunt 11 is relatively longer than the length of the current conducting piece 12 when the external current is applied to the shunt 11, There is a high possibility that a crack occurs in the silver solder portion which is the engagement portion of the front piece 12.

Particularly, since the length of the connecting portion of the shunt and the current conducting piece 12 with respect to the entire length of the shunt is very short, a crack can easily occur even with a small external force applied to the shunt 11.

 Even if the shunt coupling groove 13 is deeply soldered to increase the coupling force of the coupling portion, the length of the portion to be soldered for coupling the shunt 11 and the current conducting piece 12 is not greatly different, 13) The longer the inside length is, the more the amount of wasted manganese is increased, which is not economical.

In addition, since the conventional shunt engaging groove 13 is often fabricated to have a width equal to the width of the current conducting piece 12 in order to facilitate machining, the shunt engaging groove 13 does not serve to hold the shunt at the side of the shunt 11, .

2, 3, and 4, in order to solve such a disadvantage, a shunt coupling groove 13 is formed in the shunt tube 12 in the conventional manner and a side coupling groove 14 is formed through the shunt tube 12 Lt; / RTI > FIG. 2 shows the overall shape of the shunt using the shunt coupling method according to the present invention, and FIGS. 3 and 4 show the coupling part in more detail.

The side coupling groove 14 forms the side coupling groove 14 so that the side surface of the shunt 11 can be seen in the side coupling groove 14 when the shunt 11 is inserted into the shunt coupling groove 12.

That is, the side coupling groove 14 is formed to penetrate the shunt tube 12 in a direction perpendicular to the shunt coupling groove 13, and the side coupling groove 14 is formed not too deeply than the shunt coupling groove 13 The shunt tube 12 can be completely penetrated so that the shunt 11 is coupled and then welded in the shunt coupling groove 13 as well as in the side coupling groove 14.

Therefore, in the prior art, the silver wire welded joints are formed only at the ends of the shunt, whereas the silver welded joints can be welded to both sides of the side joint grooves 14, so that welding is performed in various places. .

Fig. 4 shows a soldering portion. In the related art, if only the portion corresponding to the reference numeral 15 is soldered, it can be confirmed that the soldering portion is soldered to the soldering portion corresponding to the reference numeral 16 in the case of the present invention. In order to make it easy to understand, portions of silver solder 15 and 16 are shown in green.

In order to increase the area of the silver solder portion, the side coupling grooves 14 are formed as wide as possible to make the length of the side edges of the side coupling grooves 14 longer. As shown in Fig. 4, the soldering solder 16 is formed along the outer periphery of the side fitting groove 14, and the same type of soldering solder is formed on the opposite side of the illustrated portion. Therefore, And the connection is formed through the silver solder on both sides and the upper side, so that the connection is made more firmly. That is, the width of the portion to be brazed by the depth of the side engagement groove 14 is wider.

In particular, if the length of the shunt is much larger than the length of the joint, the torque generated from the joint farther than the joint may be a problem. However, if the conventional technique has a configuration in which the shunt is held in only one portion of the end, So that even when a torque is generated by an external force, there is no possibility that cracks will occur due to damage to the silver halide welded portion.

Fig. 5 shows the difference between the case according to the present invention and the welding structure according to the prior art. 5 is a side sectional view of the joint portion and a side view and a plan view of the joint portion are shown on the left side of FIG. 5. However, if the welded joint 2 is formed only at the joint portion between the shunt 1 and the current conducting piece 3, In this case, more than two joints are formed only in cross section through the side joint groove.

In other words, even if the width of the portion indicated by black in FIG. 5 or the portion indicated by green in FIG. 4 is simply compared, in the case of the present invention, since the welded portion is widened and the shunt is caught more than two places, do.

In the side view shown on the right side of FIG. 5, the shunt may be formed to have a width equal to the width of the current conducting piece 3, and the shunt may be sideways, while the portion of the silver weld 2 is only on both sides of the shunt In the present invention, the shunt coupling groove is formed inside the current conducting piece so that the shunt does not fall to the side of the current conducting piece, and the shunt is held from the lower side through the silver soldering in the side fitting groove.

Figure 6 shows an alternative embodiment of the shunt according to the invention. The shape of the shunt can be changed according to need and even if the shunt of any shape is combined, the coupling strength between the side coupling groove 14 and the shunt coupling groove 13 is maintained.

1,11: Shunt 2.15,16: Silver welding
3, 12: current conduction piece 13: shunt coupling groove
14: side coupling groove

Claims (3)

As a shunt coupling structure,
The shunt coupling groove 13 is formed at the end of the current conduction piece 12 coupled to the shunt 11 so that the shunt is inserted into the shunt coupling groove 13, And
A side coupling groove 14 is formed through the current conducting piece 12 in a direction perpendicular to the direction in which the shunt coupling groove 13 is formed
And the shunt coupling groove 13 and the side coupling groove 14 are welded by soldering solder so as to couple the shunt and the current conducting piece 12. The width of the shunt coupling groove is smaller than the width of the current conducting piece 12, So that the shunt engaging groove is formed as a closed curve so that the shunt does not fall off to the side, delete [2] The apparatus of claim 1, wherein the side coupling grooves are formed in a closed curve shape to increase the area of the silver soldering welded portion, and the inside of the side coupling grooves are welded by silver soldering during the shunt coupling, thereby joining the shunt at two or more ends Shunt coupling structure
KR1020160059129A 2016-05-13 2016-05-13 Structure of shunt KR101725990B1 (en)

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KR1020160059129A KR101725990B1 (en) 2016-05-13 2016-05-13 Structure of shunt

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102483816B1 (en) * 2022-05-04 2023-01-04 (주)케이엔씨 High capacity shunt

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06275325A (en) * 1993-03-24 1994-09-30 Mitsubishi Electric Home Appliance Co Ltd Connecting structure for conducting wire
KR101381425B1 (en) * 2013-05-14 2014-04-04 (주)에이치엔티 Super high-capacity shunt
KR101393104B1 (en) * 2013-05-14 2014-05-09 (주)에이치엔티 Busbar inverse symetrical type shunt
KR20140134517A (en) * 2013-05-14 2014-11-24 (주)에이치엔티 Non-welding solder mount type shunt

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06275325A (en) * 1993-03-24 1994-09-30 Mitsubishi Electric Home Appliance Co Ltd Connecting structure for conducting wire
KR101381425B1 (en) * 2013-05-14 2014-04-04 (주)에이치엔티 Super high-capacity shunt
KR101393104B1 (en) * 2013-05-14 2014-05-09 (주)에이치엔티 Busbar inverse symetrical type shunt
KR20140134517A (en) * 2013-05-14 2014-11-24 (주)에이치엔티 Non-welding solder mount type shunt

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102483816B1 (en) * 2022-05-04 2023-01-04 (주)케이엔씨 High capacity shunt
WO2023214640A1 (en) * 2022-05-04 2023-11-09 (주)케이엔씨 Large-capacity shunt

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