KR101393104B1 - Busbar inverse symetrical type shunt - Google Patents

Abstract

The present invention provides a busbar inverse symmetrical type shunt. A shunt (25) installed on a circuit to conduct current to measure current according to the configuration of the present invention includes a first busbar (22A) having a current conducting member (24) at one side of a shunt coupling member (23), so that the current conducting member (24) is electrically connected to the current conduction circuit; a plurality of plate-shaped shunts (25) having one end portion connected to the shunt coupling member (23) of the first busbar (22A) and arranged in parallel to each other; and a second busbar (22B) having the current conducting member (24) at one side of the shunt coupling member (23), so that the current conducting member (24) is electrically connected on the current conduction circuit. The shunt coupling member (23) is connected to another end portion of the shunt (25), and the current conducting member (24) is inversion-symmetric to the current conducting member (24) of the first busbar (22A) to a reference line parallel to a longitudinal direction of the shunt (25).

Description

Busbar inverse symmetrical type shunt

The present invention relates to a large-capacity shunt in which a bus bar (bus bar) which is a current carrying portion is designed in a reverse-symmetrical manner, and more specifically, The present invention relates to a bus bar symmetrical shunt of a new structure capable of ensuring accuracy of current measurement as a large-capacity shunt.

Generally, a shunt is basically an element used for measuring a current. A shunt is connected to an energizing circuit of an electric / electronic device, a voltage is measured using a resistance value generated when a current flows through the shunt, The voltage measurement makes it possible to measure the current. The voltage applied to both ends of the shunt is measured and converted into a 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.

However, in the related art, too much resistance is generated between the shunt and the circuit board in order to electrically connect the shunt to the circuit board for current measurement, and when too much resistance is generated, the current charging object, for example, There is a problem that the charging current of the secondary battery is measured to be too small. When the measured current of the secondary battery is measured to be too small, the secondary battery that is the object of charging may be charged with an excessive amount of current. As a result, . 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 arise.

Specifically, as shown in Fig. 1, a shunt frame 2 for holding a shunt 1 for measuring a current, and a pair of copper materials arranged to face each other on the shunt frame 2 A bolt 4 for fixing the shunt bracket 3 to the shunt frame so as to be energetically connected to the circuit board and a shunt bracket 3 for fixing the shunt bracket 3 to the shunt bracket 3, And a shunt support unit including an electrically conductive connecting piece (which may be a metal piece or a wire) connected between the connecting bolt 5 and the circuit board, A current measuring device such as an ammeter is connected to both terminals of the shunt 1 via connecting means 7 such as electric wires in a state in which both ends of the shunt 1 are fixed to the shunt frame 2 facing each other by soldering soldering Connect the current It is cleansed.

The shunt current measurement structure includes a soldering resistor (soldering resistance of the substrate) for connecting the connecting bolt and the circuit board so as to be energized so as to constitute the current measuring shunt circuit, a resistance (connecting piece resistance) of the connecting piece itself, The resistance of the shunt bracket itself (the shunt bracket itself is made of copper and can be referred to as copper resistance by the shunt bracket itself, and the resistance of the shunt bracket itself is referred to as the copper resistance for convenience) A resistance (bolt resistance) of a bolt that fixes the bracket to the shunt support frame so that the bracket can be energized to the circuit board, a resistance (silver solder resistance) to the shunt bracket that fixes the end of the shunt to the shunt bracket, The resistance of the connecting piece, the first bolt resistance, the second bolt resistance, and the soldering solder resistance, The charging current of the secondary battery, which is the current charging / discharging target, is measured to be excessively small, and the measured current of the secondary battery is measured to be too small, so that the secondary battery is excessively charged The secondary battery is liable to be charged with a large amount of current, resulting in serious problems such as the secondary battery being blown.

Also, when the amount of heat generated by the resistor increases by about 10 DEG C, the resistance value changes by about 10,000 ppm. As described above, conventionally, the resistance value is significantly increased due to a considerable amount of heat generated in a place where the resistance is considerably large. there is a problem. In the case of shunt, the current measurement accuracy can be guaranteed only when the heating value is about 15 to 50 ppm per 1 ° C. If the shunt resistance value changes to 1% or more based on the total resistance value, the shunt resistance In other words, the resistance value can not be used as a standard resistance. In the past, since the resistance value is generated at a considerably large number of points, the resistance value is much more than 1%, and the shunt itself can not be used. In other words, when the shunt current change specification is within ± 0.2% ~ 0.5% in 10 ℃ ~ 15 ℃ range of change of calorific value and shunt current change value is 1% It is impossible to satisfy the requirement that the current change value specification should be within the range of ± 0.2% to 0.5% in the range of 10 ° C. to 15 ° C. change in the calorific value due to the resistance occurring at such a large number of places as described above, It is impossible to satisfy the condition that the current change value of the shunt should be within 1% based on the total current value, so that the shunt can not be used as a result.

Conventionally, both ends of the shunt are fixed to two opposing shunt brackets by silver solder. When a current flows in the shunt or current flow is interrupted, the shunt bracket itself is fixed with bolts, while the shunt itself A crack occurs in the soldering solder portion of the shunt due to an external impact or the like. When such a crack is generated, the resistance value is increased and the charging current of the current charging / discharging subject (secondary battery or the like) So that the above-mentioned various problems are caused. 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.

On the other hand, the shunt has a large capacity shunt that is used when the current measuring capacity is relatively high. Such a large capacity shunt (hereinafter referred to simply as " shunt for convenience ") is configured to be significantly larger than the width of the both-side portion where the widths of the side portions are orthogonal to each other (relatively larger than the side portions of the low- And the side portions of the shunt are set up in a vertical direction (a direction parallel to the vertical direction of the shunt bracket) while being fixed to two opposing shunt brackets by soldering.

However, when the shunt is installed upright in the vertical direction as described above, the current can not stably and uniformly flow, the current fluctuation phenomenon occurs depending on the relative position of the shunt, and the accurate measurement of the current can not be performed . In other words, when a current flows through the shunt, the shunt itself is also a resistance, and the soldering solder portion connecting both ends of the shunt to the shunt bracket is also a resistor. Since the shunt is a manganese or manganese alloy, the temperature of the soldering solder rises, When the temperature of the soldering portion rises, the length of the current flow circuit in which the current flows along the shunt increases while the soldering solder resistance rises. As the current flow circuit becomes long, the resistance fluctuates and the current fluctuates. A difficult problem arises. That is, the noise, which is a disturbance factor of the current measurement, is also amplified, resulting in a failure to accurately measure the current.

2, when a current flows through one shunt bracket 3 and a current passes through the silver solder 8 and the shunt 1 itself and flows through the other shunt bracket 3 When the current flows through the path denoted by C1 when the current flows in, the temperature of the portion of the silver solder 8 corresponding to the C1 point is increased, and the temperature of the solder solder 8) When the temperature rises, the resistance increases and the current flows in the direction indicated by C2. When the current flows to the point C2, the temperature of the portion of the soldering solder 8 corresponding to the point C2 increases and the resistance of the portion increases. When the current flows through the C3 path, the temperature of the soldering solder 8 at the point corresponding to C3 rises and the resistance rises. Therefore, the current again flows through the path above C3 A current flow process is performed to cause a variation in resistance, a variation in resistance, and a current fluctuation. As a result, noise, which is a current disturbing factor, is also amplified and accurate current measurement is performed It is the result that can not be supported. On the other hand, if the current flows along the C4 path, the temperature becomes lower again at a point other than C4 (that is, the point where the temperature has previously been raised), and the resistance becomes lower again when the temperature at the other point becomes lower. (For example, a point C1). As a result, a current fluctuation occurs. As a result, the current measurement accuracy as described above does not come out properly. As a result, the above- will be. This current fluctuation phenomenon becomes more severe as the high capacity (the current measurement range is high capacity), and the higher the capacity, the more the current measurement accuracy is lowered. For example, if the measurement error (ampere difference) of the current is doubled, the power error (wattage) is quadrupled. If the current measurement error is 10 times, the power error is 100 times different. Is more likely to fall.

SUMMARY OF THE INVENTION The present invention has been developed in order to solve the above-mentioned problems, and an object of the present invention is to provide a semiconductor device and a method of manufacturing the same, It is intended to provide a bus bar bar symmetrical shunt with a new structure capable of ensuring current measurement accuracy as a large-capacity shunt.

According to the present invention for solving the above problems, there is provided a shunt provided on a circuit through which a current is passed to measure a current, wherein a current conduction piece is provided on one side of the shunt coupling, A first bus bar electrically connected to the bus bar; A plurality of plate-shaped shunts connected at one end to the shunt engagement pieces of the first bus bar and arranged in parallel to each other; A current conduction piece is provided on one side of the shunt coupling piece so that the current conduction piece is electrically connected to the current energizing circuit and the shunt coupling piece is connected to the other end of the shunt and the current conduction piece is parallel to the longitudinal direction of the shunt And a second bus bar disposed in a direction that is antiparallel to the current conducting piece of the first bus bar about a baseline.

Wherein the shunt coupling piece of the first bus bar and the shunt coupling piece of the second bus bar are arranged to face each other, and the shunt coupling piece of the first bus bar and the shunt coupling piece of the second bus bar are arranged to face each other, Wherein the first and second bus bars and the second bus bar are disposed at positions displaced from each other with respect to a center line orthogonal to the longitudinal direction of the shunt coupling pieces, wherein the first bus bar and the second bus bar form an anti-symmetric structure.

When one of the first bus bar and the second bus bar is arranged in a translator shape when viewed from the side, the other is arranged in a tongue-like shape so that the first bus bar and the second bus bar are arranged in an anti-symmetrical manner .

When one of the first bus bar and the second bus bar is arranged in a reverse shape when viewed from the side, the other bus bar and the second bus bar are arranged in an inverse transducer shape so that the first bus bar and the second bus bar are antiparallel to each other .

Wherein the shunt is formed in a plate shape having a width smaller than the width of both side portions orthogonal to the width of the side portion, both side portions of the shunt are arranged in the vertical direction and the both side portions are arranged in the horizontal direction Wherein the shunt has a structure in which the relatively wide both-side portions are laid down in a horizontal direction.

Wherein the shunt coupling pieces of the first bus bar and the second bus bar are coupled such that the two shunts are arranged in parallel with each other, the shunt coupling pieces are provided with Kelvin sensing points, And the distance between the two shunts and the Kelvin sensing point is the same.

The shunt coupling pieces facing each other in the first bus bar and the second bus bar are formed with slits extending in the horizontal direction and both end portions of the plate shunt are fitted to the slits of the shunt coupling pieces, And both ends of the shunt are fixed by soldering solder.

Two shunt pieces are coupled to the shunt coupling pieces facing each other in the first bus bar and the second bus bar so that one shunt out of the two shunts and the current conducting piece of the first bus bar Wherein the first bus bar and the second bus bar are disposed at one side with respect to a horizontal center line of the second bus bar and the current shunt piece of the second bus bar and the other shunt are positioned at the horizontal Symmetrical structure arranged at the other position with respect to the direction center line.

The present invention's busbar symmetrical shunt can implement the same current path (current flow path) by designing the first and second bus bars (bus bars) Signboard) can be made constant, and thus the current measurement accuracy can be improved.

Also, it is possible to prevent excessive resistance from occurring between the shunt and the circuit board in order to electrically connect the shunt of the bus bar of the present invention to the circuit board for current measurement, and to prevent an excessive resistance from being generated It is possible to solve the problem that the charging capacity current of the secondary battery as the current charging object is measured to be too small. However, since the shunt of the present invention is mainly used for charging and discharging current in a secondary battery, it can be understood that the secondary battery described in the present invention has the above merits only when charging or discharging the overcurrent of the secondary battery. However, It should be understood that it is one of materials or devices. That is, it should be understood that the advantages of the present invention are not only applied to charge and discharge of the secondary battery, but also to other applications utilizing the shunt of the present invention in addition to the secondary battery.

The present invention does not occur when resistance fluctuation and current fluctuation occur in accordance with the vertical position of the shunt (that is, the vertical position of the side portion of the shunt), and when the current flowing through the shunt is measured (resistance is measured) There is an advantage to prevent cases. In other words, according to the present invention, since the side portions with relatively small widths are arranged vertically and the relatively wide side portions are provided so as to lie in the horizontal direction, the current fuluctuation phenomenon It is possible to prevent the occurrence of an excessive amount of current, thereby contributing to an increase in the current measurement precision.

In the present invention, since the Kelvin sensing point is provided at the center portion of each shunt-coupled member of the first shunt and the second shunt, the distance between the Kelvin sensing point and the first shunt and the distance between the second shunt and the second shunt are So that the current flow to the Kelvin sensing point is made uniform, thereby ensuring high current measurement accuracy.

1 is an external perspective view showing a shunt structure for a conventional current measurement;
Fig. 2 is a front view schematically showing a main portion of the shunt structure shown in Fig. 1 and a current flow state; Fig.
3 is an external perspective view of a symmetrical shunt of a bus bar according to the present invention;
Fig. 4 is a front view of Fig. 3
Figs. 5A and 5B are front views schematically showing the current flow state and the bus bar anti-symmetric shunt shown in Fig.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The objects, features and advantages of the present invention will be more readily understood by reference to the accompanying drawings and the following detailed description. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; may be "connected," "coupled," or "connected. &Quot;

It is to be understood that the present invention may be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. The present invention should not be construed as limited to the embodiments described in Figs.

Referring to the drawings, the present invention is a bus bar symmetrical shunt that maintains the same structural current path (current flow path) through the counter-symmetrical welded structure of the current-carrying bus bars at both ends of the shunt 25, A first bus bar 11A having a current conducting piece 24 at one side of the shunt coupling piece 23 and one end connected to the shunt coupling piece 23 of the first bus bar 22A And the shunt coupling piece 23 is provided on one side of the shunt coupling piece 23 so that the second shunt coupling piece 23 is connected to the other end of the shunt 25, And a bus bar 22B.

The first bus bar 22A is made of an electrically conductive metal material and has a rectangular plate-like shunt coupling piece 23 and a plurality of shunt coupling pieces 23 extending in one direction (substantially perpendicular direction) (24). The current conducting piece 24 is provided with a fastening hole, so that a current-conducting structure can be provided by electrically connecting a conductive fastener inserted in the fastening hole to the circuit board. A slit 27 is formed horizontally on the surface of the shunt coupling piece 23 of the first bus bar 22A facing the shunt coupling piece 23 of the second shunt coupling piece 23 to be described later. In the present invention, two slits (27) are formed in a state where they are spaced apart from each other by a predetermined distance in the vertical direction of the shunt coupling piece (23).

One end of the shunt 25 is electrically connected to the shunt coupling piece 23 of the first bus bar 22A. And is fixed by silver solder in a state where one end of the shunt 25 is engaged with the slit 27 formed in the shunt coupling piece 23 of the first bus bar 22A. The shunt coupling piece 23 of the first bus bar 22A is formed with two slits 27 in the vertical direction so that one end of the shunt 25 in the form of two rectangular plates is connected to the slit 27 27 and fixed to the shunt coupling piece 23 of the first bus bar 22A by soldering solder. At this time, the shunt 25 is configured to be relatively small in width as compared with the width of the both-side portion 25b at which the widths of the both side portions 25a are orthogonal to each other. Therefore, when the shin body 25 is viewed from the top, the shin body 25 is formed in a flat surface shape having a surface that widens in the direction of both side surfaces 25a.

A second bus bar 22B is coupled to the other end of the shunt 25. The second bus bar 22B is made of a conductive metal material and includes a shank coupling piece 23 in the form of a rectangular plate and a current conducting piece 23 extending in one direction (substantially perpendicular to the shank coupling piece 23) 24). The current conducting piece 24 is provided with a fastening hole, so that a current-conducting structure can be provided by electrically connecting a conductive fastener inserted in the fastening hole to the circuit board. A slit 27 is formed horizontally on the surface of the shunt coupling piece 23 of the second bus bar 22B facing the shunt coupling piece 23 of the first shunt coupling piece 23. [ In the present invention, two slits (27) are formed in a state where they are spaced apart from each other by a predetermined distance in the vertical direction of the shunt coupling piece (23). The shunt coupling piece 23 of the second bus bar 22B has two slits 27 in the vertical direction so that the other end of the shunt 25 in the form of two rectangular plates is slit- (23) of the second bus bar (22B) by soldering solder in a state of being fitted to the shunt connecting piece (27).

In the present invention, the shunt 25 is made of a manganese to manganese alloy (for example, a mixed alloy of manganese and copper). The shunt 25 is made of a double-sided portion 25b The width is relatively small. Therefore, when viewed from above the first bus bar 22A and the second bus bar 22B, the shunt 25 has a square flat top shape (manganese to manganese alloy square flat top shape) having a surface flattened in the direction of both side portions 25a . In other words, the shunt 25 is formed in a plate shape that is relatively small in width as compared with the width of the both-side portion 25b at which the width of the side portion 25a is orthogonal to the both side portions 25a. Side portion 25b are arranged in a horizontal direction in parallel with the current conducting piece 24 of the first bus bar 22A and the current conducting piece 24 of the second bus bar 22B so that the shunt 25 Side relatively wide portions 25b of the respective side walls 25b are laid down in the horizontal direction.

The second shunt 25 has a current conducting piece 24 provided on one side of the shunt connecting piece 23 so that the current conducting piece 24 is electrically connected to the current conducting circuit, The current conduction piece 24 is connected to the other end of the shunt 25 and the current conduction piece 24 is antiparallel to the current conduction piece 24 of the first bus bar 22A about the reference line parallel to the longitudinal direction of the shunt 25. [ It is important to take a structure that is arranged in the direction in which it is oriented. That is, the shunt coupling piece 23 of the first bus bar 22A and the shunt coupling piece 23 of the second bus bar 22B are disposed in a direction facing each other, and the shunt coupling piece 23 of the first bus bar 22A The current conducting piece 24 of the current conducting piece 24 and the current conducting piece 24 of the second bus bar 22B are disposed at positions displaced from each other with respect to a center line orthogonal to the longitudinal direction of the two mutually facing shunt connecting pieces 23 , The first bus bar 22A and the second bus bar 22B have an anti-symmetric structure. To be precise, the current conducting piece 24 of the first bus bar 22A is disposed at one position with respect to the center line orthogonal to the longitudinal direction of the two mutually facing shunt connecting pieces 23, and the second bus bar 22B are arranged at the other position with respect to the center line orthogonal to the longitudinal direction of the two mutually facing shunt engagement pieces 23 so that the first bus bar 22A and the second bus bar 22A And the bus bar 22B is arranged to be symmetrically inverted.

When one of the first bus bar 22A and the second bus bar 22B is arranged in a translator shape when viewed from the side, the other is arranged in a tongue shape so that the first bus bar 22A and the second bus bar 22B 2 bus bars 22B are arranged symmetrically with respect to each other. Or one of the first bus bar 22A and the second bus bar 22B is arranged in a reverse shape when viewed from the side, and the other is arranged in an inverse transducer shape so that the first bus bar 22A and the second bus bar 22B And the second bus bars 22B are arranged in a symmetrical manner to each other.

In summary, two shunts 25 are coupled to each other in parallel with the respective shunt coupling pieces 23 of the first bus bar 22A and the second bus bar 22B, and the two shunts 25 One shunt 25 of the first bus bar 22A and one current bus bar 24 of the first bus bar 22A are positioned at one side with respect to the horizontal center line of the first bus bar 22A and the second bus bar 22B And the current shunt piece 24 of the other shunt 25 and the second bus bar 22B is disposed on the other side with respect to the horizontal center line of the first bus bar 22A and the second bus bar 22B, The two first bus bars 22A and the second bus bar 22B have a symmetrical structure with respect to each other.

In the present invention, two shunt 25 are coupled to the shunt coupling pieces 23 of the first bus bar 22A and the second bus bar 22B such that the shunt coupling pieces 23 Are provided with a Kelvin sensing point 26. The Kelvin sensing point 26 is provided at the center of the shunt coupling pieces 23 so that the distance between the two shunts 25 and the Kelvin sensing point 26 is the same.

In the present invention, each of the current conducting pieces 24 of the first bus bar 22A and the second bus bar 22B is electrically connected to a current applying circuit, specifically, a circuit board, And the shunt coupling pieces 23 are disposed upright in the vertical direction so that the two shunts 25 are arranged in a horizontal direction. In the present invention, the two first bus bars 22A, Kelvin sensing ends are provided at the central portions (upper, lower, front and rear center portions) of the respective shunt coupling pieces 23 of the first and second bus bars 22A, 22B.

Therefore, the distance between the Kelvin sensing end and the one shunt 25 and the distance between the Kelvin sensing end and the other shunt 25 are the same. That is, the distances between the two shunts 25 and the Kelvin sensing end have the same structure. Further, in the present invention, the shunt coupling pieces 23 of the two first bus bars 22A and the second bus bars 22B are arranged on the current-carrying circuit so that the two shunt 25 are arranged on the wide surface The distance from the upper end of the shunt coupling piece 23 to the shunt 25 is equal to the distance from the lower end of the shunt coupling piece 23 to the other shunt 25.

The bus bar anti-symmetric shunt of the present invention having the above-described configuration is configured such that both terminals thereof are electrically connected to the circuit board (i.e., the current passing through the current passing pieces 24 (24a, 24b) of the first bus bar 22A and the second bus bar 22B And a current measuring device such as an ammeter is connected to the Kelvin sensing terminal provided on the shunt coupling piece 23 of the first bus bar 22A and the second bus bar 22B While on the circuit board on which the shunt 25 is installed and on which the shunt 25 is energized via the first bus bar 22A and the second bus bar 22B, The amount of current of the current measurement object is measured in a state in which the measurement object is connected to be energized. A method of measuring the current using the shunt 25 is in the form of a current measurement known as Kelvin sensing which causes current to flow between the two terminals of the shunt 25, (25), and measures the current using Ohm's law. That is, the shunt 25 is mounted on the circuit of the board for current measurement, and a current measuring device such as an ammeter is connected to the Kelvin sensing point of the shunt 25 to be energized The current is measured.

The first bus bar 22A, which constitutes the shunt 25 of the present invention as described above, is used for measuring the amount of current (current charging amount) of the secondary battery by the Kelvin sensing. And the secondary battery is connected to the Kelvin sensing terminal provided on the second bus bar 22B on the shunt 25 circuit side (on the circuit board on which the shunt 25 of the present invention is mounted) The current flowing through the shunt 25 is detected at the Kelvin sensing terminal in the state where the extreme end and the positive terminal are electrically connected to each other so as to measure the current charging amount of the secondary battery.

In this case, since the symmetrical shunt of the bus bar of the present invention is designed in a symmetrical manner with respect to the first bus bar 22A and the second bus bar 22B (bus bars), which are the main parts, the current path (current flow path) So that the structural resistance component between each shunt 25 (net base plate) can be made constant, which has the advantage of increasing the current measurement precision.

A current flows into the current conducting piece 24 of the first bus bar 22A and flows into the current conducting piece 24 of the second bus bar 22B through the shunt 25 as shown in Figs. The distance D1a of the current conducting piece 24 of the first bus bar 22A and the distance D1a of the first bus bar 22A on the one side (lower side) of the shunt connecting piece 23 of the first bus bar 22A, A distance D1c from one end of the first shunt 25 to the other end and a distance D1c from the other end of the first shunt 25 to the other end of the first shunt 25, The distance D1d which is raised to the shunt coupling piece 23 and the distance D1e of the current conducting piece 24 of the second bus bar 22B are the sum of the current conduction distance of the current- The distance D2b of the second shunt 25 from the shunt coupling piece 23 of the first bus bar 22A to the other shunt 25 of the other shunt 25, The distance D2c from one end to the other end, the distance D2c from the other end to the other end, And the distance D2d of the second bus bar 22B to the shunt connecting piece 23 of the second bus bar 22B and the distance D2e of the current conducting piece 24 of the second bus bar 22B, Therefore, it is possible to realize that the electric current flows in and the distances of the respective shunt 25, that is, the escaping distance through the first shunt 25 and the second shunt 25 are equal to each other, 25) (net board) can be made constant, so that the accuracy of current measurement can be increased. That is, D1a + D1b + D1c + D1d + D1e = D2a + D2b + D2c + D2d + D2e, whereby the structural resistance component between each shunt 25 can be made constant.

The reason why the structural resistance between the shunt 25 and the bus bar 22B is kept constant to ensure the accuracy of current measurement is that the first bus bar 22A and the second bus bar 22B, which are current- And this is a key feature of the reverse symmetric shunt structure of the present invention.

As described above, the present invention significantly reduces the resistance source generated at a considerable number of places, thereby preventing the resistance value from being extremely increased due to a considerable amount of heat generated. It is possible to ensure that the measurement is performed accurately. In the case of the shunt 25, the current measurement accuracy can be ensured by the flow of the constant current only when the calorific value is about 15 to 50 ppm per 1 DEG C, and when the calorific value changes by 1 DEG C and the resistance change value of the shunt 25 is 1% The resistance value of the shunt resistor 25 can not be used as a standard resistance. However, the present invention avoids the structure in which the resistance is generated at a considerably large number of points, It is possible to prevent the problem that the shunt 25 itself can not be used. In other words, the current change value specification of the shunt 25 must be within ± 0.2% to 0.5% in the range of 10 [deg.] C to 15 [deg.] C of the change in the calorific value and the current change value of the shunt 25 at the low current Or more, the current can not be used as the shunt 25. In the present invention, since the resistance generation sources as described above are completely eliminated, the current variation value specification is within the range of ± 0.2% to 0.5 And the condition that the current change value of the shunt 25 should be within 1% based on the total current value can be satisfied at the low current, and as a result, the shunt 25 can not be used The problem is that it has no advantage at all.

In addition, since the distances between the first shunt 25 and the second shunt 25 and the Kelvin sensing point 26 are equal to each other, the measured current value is uniformly output from the Kelvin sensing point 26, Another feature is the ability to ensure high current measurement accuracy. That is, since the Kelvin sensing point 26 is provided at the center of each shunt coupling piece 23 of the first shunt 25 and the second shunt 25, the Kelvin sensing point 26 and the first shunt 25 And the distance between the second shunt 25 and the second shunt 25 are made equal to each other, so that the current flow to the Kelvin sensing point 26 is uniformly performed, thereby ensuring high current measurement accuracy.

It is to be understood that the terms "comprises", "comprising", or "having" as used in the foregoing description mean that a component can be implanted unless specifically stated to the contrary, But should be construed as further including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

22A. The first bus bar 22B. The second bus bar
23. Shunt coupling piece 24. Current tube
25. Shunt 25a. Side portion
25b. Both sides 26. Kelvin sensing point
27. Slit

Claims (6)

A shunt (25) mounted on a circuit through which a current is energized to allow a current to be measured,
A first bus bar (22A) having a current conducting piece (24) provided on one side of the shunt coupling piece (23) and electrically connecting the current conducting piece (24) to the current conducting circuit;
A plurality of plate-shaped shunts (25) connected at one end to the shunt coupling pieces (23) of the first bus bar (22A) and arranged in parallel with each other;
A current conduction piece 24 is provided on one side of the shunt coupling piece 23 so that the current conduction piece 24 is electrically connected to the current conduction circuit and the shunt coupling piece 23 is connected to the shunt coupling piece 23 And the current conduction piece 24 is connected to the other end of the first bus bar 22A in a direction opposite to the current conduction piece 24 of the first bus bar 22A about a reference line parallel to the longitudinal direction of the shunt 25 And a second bus bar (22B) arranged in the second direction.
The method according to claim 1,
The shunt coupling piece 23 of the first bus bar 22A and the shunt coupling piece 23 of the second bus bar 22B are disposed in a direction facing each other, The current conduction piece 24 of the second bus bar 22B and the current conduction piece 24 of the second bus bar 22B are disposed at positions displaced from each other with reference to a center line orthogonal to the longitudinal direction of the shunt coupling pieces 23 , And the first bus bar (22A) and the second bus bar (22B) have a symmetrical structure with respect to each other.
3. The method of claim 2,
The shunt 25 is formed in a plate shape that is relatively small in width as compared with the width of the both side portions 25b at which the width of the side surface portion 25a is orthogonal to each other and both side portions 25a of the shunt 25 are arranged in the vertical direction The double-sided portion 25b is arranged in a horizontal direction parallel to the current conducting piece 24 of the bus bar so that the relatively wide portion 25b of the shunt 25 is laid horizontally Wherein the bus bar is a symmetrical shunt.
The method according to claim 1,
Two shunt 25 are coupled to the shunt coupling pieces 23 of the first bus bar 22A and the second bus bar 22B so as to be arranged in parallel with each other. The Kelvin sensing point 26 is provided at a central portion of the shunt coupling pieces 23 so that the distance between the two shunt 25 and the Kelvin sensing point 26 And the distances are the same.
The method according to claim 1,
A slit 27 extending in the horizontal direction is formed in the shunt coupling piece 23 facing the first bus bar 22A and the second bus bar 22B, Wherein both ends of the shunt (25) are fitted to the slit (27) and both ends of the shunt (25) are fixed to the shunt coupling piece (23) by soldering solder.
6. The method of claim 5,
The shunt 25 is coupled to the shunt coupling piece 23 facing the first bus bar 22A and the second bus bar 22B in parallel to each other. One shunt 25 of the first bus bar 22A and the current conducting piece 24 of the first bus bar 22A are connected to one side of the first bus bar 22A and the second bus bar 22B And the other shunt 25 and the current conducting piece 24 of the second bus bar 22B are arranged in the horizontal direction center line of the first bus bar 22A and the second bus bar 22B, Symmetric shunt is disposed at the other position with respect to the bus bar.

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