KR20220148962A - High power fuse and manufacturing method the same - Google Patents

Abstract

One embodiment of the present invention provides a cartridge locked-type high-power fuse having a high breaking capacity when an overcurrent flows by a brazing junction comprising a metal plate, and a manufacturing method therefor. The present invention provides the high-power fuse that enables the breaking capacity of the fuse to be improved through a strong brazing junction between a metal plate and a ceramic tube case and a metal terminal and a fusible body by positioning the metal plate between the ceramic tube case and the metal terminal, and does not have a problem of being separated or destroyed between the ceramic case and the metal terminal due to a high pressure caused by an arc generated inside the case when the fuse is blown; and the manufacturing method therefor. The high-power fuse comprises: a ceramic tube case; a soluble body; a metal terminal; a ceramic small body; and a metal plate.

Description

HIGH POWER FUSE AND MANUFACTURING METHOD THE SAME

The present invention relates to a high-power fuse, which is a main fuse for protection of secondary batteries such as electric vehicles and ESSs, and more particularly, by inserting a metal plate between a fuse fuse body and a ceramic tube case and a metal terminal and brazing to prevent inrush overcurrent in a circuit. The present invention relates to a high-power fuse that safely protects a secondary battery by melting a fuse element without damaging the fuse when it occurs, and a method for manufacturing the same.

Devices that require high current, such as electric vehicles and ESS (Energy 　 Storage System), introduce secondary batteries into the main circuit.

The electric vehicle uses a high voltage of 300V or more, and an ESS (Energy 　 Storage System) is a single system that generally stores power of several hundred kWh or more.

In order to block the inrush overcurrent of the device to which the high current is applied, a high-power fuse having a high breaking capacity is required.

The electric vehicle or ESS (Energy 　 Storage System) needs to safely protect the secondary battery by blocking the inrush overcurrent generated in the main fuse circuit for protecting the secondary battery.

The high-power fuse is a fuse used in a high-voltage circuit, and has a structure for extinguishing an arc generated when the circuit is cut off.

In addition, the conventional high-power fuse adopts a method in which a ceramic tube case, a metal terminal, and a fuse body are joined with a ceramic or metal powder bond or a caulking method.

The ceramic or metal powder bonding or caulking method has low durability, such as decomposition or breakage of the fuse due to an instantaneous increase in pressure in the fuse case due to the arc generated when the fuse is melted when a high voltage is applied. There was a problem.

In addition, there is a problem in that the fuse is blown or deteriorated during discharge.

Republic of Korea Patent Publication No. 1020150130691

An object of the present invention is to provide a cartridge fastening type high-power fuse having a high breaking capacity.

Another object of the present invention is to provide a high-power fuse using a brazing junction method and a method for manufacturing the same in order to solve the problem that the fuse is blown or deteriorated when a high voltage is applied.

The technical problems to be achieved by the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by those of ordinary skill in the art to which the present invention belongs from the description below. There will be.

In order to achieve the above technical object, an embodiment of the present invention provides a high-power fuse including a metal plate.

a ceramic tube case formed to pass through the inside of the cylindrical shape;

a fuse body accommodated in the ceramic tube case and fused when an inrush overcurrent is applied;

a metal terminal fitted into both ends of the ceramic tube case and closely coupled to the metal terminal and electrically connected to the fuse body;

a ceramic extinguishing agent that is filled in the ceramic tube case and extinguishes an arc generated when the fuse element is melted; and

and a metal plate positioned between the ceramic tube case and the metal terminal at both ends of the ceramic tube case,

In the metal plate, one region of the lower surface and the ceramic tube case may be brazed, and one region of the upper surface may be brazed to the metal terminal and the fuse body.

The metal plate, the ceramic tube case, the fuse fuse body, and the metal terminal may be melted and joined by heat treatment using a brazing brazing material.

The ceramic tube case may be made of a material including alumina (Al ₂ O ₃ ) oxide.

The fuse fuse member may be made of a metal including copper (Cu).

The metal plate may be made of a metal including copper, and a plating layer containing nickel (Ni) may be formed on the metal plate.

The metal terminal may be made of a metal including copper, and a plating layer containing nickel (Ni) may be formed on the metal terminal.

The ceramic defogger may be made of a powder containing silicon oxide (SiO ₂ ).

The metal plate has a curved top shape, and a brazing brazing material is melted between the metal plate and the ceramic tube case to form a strong brazing joint.

The high-power fuse may have a breaking capacity of 30 kA or more.

The high-power fuse may have a rated voltage of DC 800V or more.

In order to achieve the above technical object, an embodiment of the present invention may provide a method of manufacturing a high-power fuse including a metal plate.

providing a ceramic tube case;

forming a molybdenum/manganese (Mo/Mn) metallizing layer by coating both ends of the ceramic tube case with a molybdenum/manganese (Mo/Mn) paste and then heat-treating;

heat-treating after coating with nickel (Ni) plating or nickel (Ni) paste on the ceramic tube case in which the molybdenum/manganese (Mo/Mn) metallizing layer is formed;

A metal plate, a brazing material for sealing the ceramic tube case, and the fuse fuse body are assembled at both ends of the ceramic tube case in which the molybdenum/manganese (Mo/Mn) and nickel (Ni) layers are formed, and the metal terminal is at one end A primary assembly and brazing bonding step of assembling a brazing brazing material for sealing and melting by heat treatment; and

After putting the defrosting agent powder inside the ceramic tube case to which the primary assembly and brazing connection have been made, a brazing brazing material is assembled at the opposite end to seal the metal plate, the fuse element, and the metal terminal, and melted by heat treatment. It may include a; secondary assembly and brazing bonding step.

The shape of the metal plate may be a circular plate shape with a curved upper portion, and the brazing brazing material may be melted to form a brazing joint.

According to an embodiment of the present invention, by locating a metal plate between the ceramic tube case and the metal terminal, the breaking capacity of the fuse can be improved through strong brazing bonding between the metal plate and the ceramic tube case, the metal terminal, and the fuse body. , it is possible to provide a high-power fuse that does not cause a problem of separation or destruction between a ceramic case and a metal terminal due to high pressure due to an arc generated inside the case when the fuse is blown, and a method for manufacturing the same.

In addition, when applied to a field requiring high power, such as an electric vehicle or ESS, when an instantaneous excessive inrush current is applied, it can be safely blocked to protect the secondary battery.

The effects of the present invention are not limited to the above effects, and it should be understood to include all effects that can be inferred from the configuration of the invention described in the detailed description or claims of the present invention.

1 is a cross-sectional view of a high-power fuse according to an embodiment of the present invention.
2 is a cross-sectional view of a high-power fuse in which an internal configuration in which a brazing junction is marked according to an embodiment of the present invention can be confirmed.
3 is a side view illustrating an internal configuration of a high-power fuse according to an embodiment of the present invention.
4 is a perspective view illustrating each component used in a high-power fuse according to an embodiment of the present invention.
5 is a flowchart of a method of manufacturing a high-power fuse according to an embodiment of the present invention.
6 is a perspective view and a cross-sectional view of a primary assembled brazing product according to an embodiment of the present invention.
7 is a perspective view and a cross-sectional view of a primary assembled brazing product to which a metal terminal is attached according to an embodiment of the present invention.
8 is a cross-sectional view of a high-power fuse showing a secondary assembly and brazing junction according to an exemplary embodiment.
9 is a perspective view of a secondary assembled high-power fuse according to an exemplary embodiment;
10 is an enlarged cross-sectional view of a junction of a high-power fuse taken by FE-SEM to show a molten state of brazing brazing material according to an embodiment.
11 is a perspective view illustrating a structure of a high-power fuse sample manufactured according to an embodiment of the present invention and a size of the high-power fuse sample.

Hereinafter, the present invention will be described with reference to the accompanying drawings. However, the present invention may be embodied in several different forms, and thus is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

Throughout the specification, when a part is "connected (connected, contacted, coupled)" with another part, it is not only "directly connected" but also "indirectly connected" with another member interposed therebetween. "Including cases where In addition, when a part "includes" a certain component, it means that other components may be further included, rather than excluding other components, unless otherwise stated.

The terms used herein are used only to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present specification, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It is to be understood that this does not preclude the possibility of the presence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

A cartridge fastening type high-power fuse having a high breaking capacity according to an embodiment of the present invention will be described.

1 is a cross-sectional view of a high-power fuse according to an embodiment of the present invention.

Referring to FIG. 1 , a configuration included in the high-power fuse can be confirmed through a cross-sectional view of the high-power fuse.

In this case, the configuration of the high-power fuse is as follows.

Ceramic tube case 130 and;

a fuse body 150 accommodated in the ceramic tube case and fused when an inrush overcurrent is applied;

metal terminals (110, 120) fitted to both ends of the ceramic tube case, closely coupled, and electrically connected to the fuse body;

a ceramic extinguishing agent 160 filled in the ceramic tube case and extinguishing an arc generated when the fusing element is melted; and

It may include a metal plate 140 positioned between the ceramic tube case and the metal terminal.

In addition, the metal plate, the ceramic tube case, the fuse fuse body, and the metal terminal may include a brazing brazing material 170 to be joined by melting by heat treatment.

2 is a cross-sectional view of a high-power fuse in which a brazing joint according to an embodiment of the present invention is displayed and an internal configuration thereof can be confirmed.

Referring to FIG. 2 , it can be seen that the metal plate is positioned between the ceramic tube case and the metal terminal at both ends of the ceramic tube case and is brazed by an arrow indicating a brazed joint.

The brazing joint may be brazed to the lower edge of the metal plate 140 and both ends of the ceramic tube case 130 .

In addition, an outer edge portion of the upper surface of the metal plate 140 and the inside of the Securing Cap 120 of the metal terminal may be brazed.

In addition, the outer central portion of the upper surface of the metal plate 140 and the inner surface of both ends of the curved shape of the fuse body 150 may be brazed.

3 is a side view illustrating an internal configuration of a high-power fuse according to an embodiment of the present invention.

Referring to FIG. 3 , it can be seen that the high-power fuse has a symmetrical top and bottom shape.

In addition, the ceramic defogger 160 may be injected into the ceramic tube case inside 130 in the form of a ceramic defogger powder.

In addition, it can be seen that the central portion of the outer surface of the upper portion of the metal plate 140 and the inner surface of both ends of the fuse body 150 are brazed.

In addition, it can be seen that the outer surfaces of both ends of the fuse body 150 are brazed to the inside of the metal terminal (Securing Cap) 120 .

That is, the outer surfaces of both ends of the fuse body 150 may be in contact with the inner surface of the metal terminal (Securing Cap) 120 .

In addition, it can be seen that the inner surface of both ends of the fuse body 150 is in contact with the outer surface of the metal plate.

Accordingly, since the metal terminals 110 and 120 and the fuse 150 may contact each other, the metal terminals 110 and 120 and the fuse 150 may be electrically connected to each other.

In addition, it can be seen that the edge of the lower edge of the metal plate and the ceramic tube case are brazed.

4 is a perspective view illustrating each component used in a high-power fuse according to an embodiment of the present invention.

Referring to FIG. 4 , the ceramic tube case 130 may have a cylindrical shape through which the inside is empty.

In addition, the ceramic tube case 130 may be made of a material including an alumina (Al ₂ O ₃ )-based oxide, and a Mo/Mn-Ni layer may be applied thereto.

In this case, the fuse body 150 of the high-power fuse may be located inside the ceramic tube case 130 and has a shape in which two plates having a plurality of circular holes are combined into one.

In addition, both ends of the fuse body have a curved shape. In addition, the fuse body is basically an integral type in which both ends are bent, but may be a separate type depending on design, or may be a straight type without bending.

In addition, the fusing member 150 may be made of a metal including copper (Cu).

At this time, the metal terminals 110 and 120 may be inserted into both ends of the ceramic tube case to be closely coupled.

In the metal terminal, the Securing Lug 110 and the Securing Cap 120 may be integrally configured or may be separated and brazed.

The Securing Lug 110 has a flat octagonal shape, and a circular or elliptical pupil may be formed therein. However, there may be some differences in the shape depending on the standard specification.

The Securing Cap 120 has a cylindrical shape and is hollow inside, one side is open, and the upper surface is open in a long rod shape.

The Securing Lug 110 and the Securing Cap 120 may be separated or integrated.

At this time, the integral type is a Securing Lug 110 formed on the upper surface of the Securing Cap 120 as one body, and may be manufactured by metal processing or casting and forging.

In this case, the metal terminal may be made of a metal including copper, and a plating layer containing nickel (Ni) or silver (Ag) may be formed on the surface of the metal terminal.

When an overcurrent is applied to the metal terminal, current can flow in the direction from the Securing Lug 110 to the Securing Cap 120 and is electrically connected to the fuse in contact with the Securing Cap 120. can

In addition, the metal plate 140 may be positioned at both ends of the ceramic tube case 130 .

The metal plate 140 may have a flat disk shape, and an upper edge portion may have a curved shape. In this case, except for the metal plate formed across the central portion, the rest of the metal plate 140 has an open shape.

In addition, by bending the upper edge of the metal plate 140, the bonding area between the ceramic tube case and the metal plate is appropriately reduced during brazing, and microcracks and breakage of the ceramic tube case due to stress caused by the difference in thermal expansion coefficient. can prevent

The lower edge of the rim of the metal plate 140 is in contact with the ceramic tube case, the outer surface of the upper rim of the metal plate 140 is in contact with the metal terminal 120 , and the outer surface of the upper central part of the metal plate 140 . The silver may be in contact with the fuse body 150 .

In this case, the metal plate 140 may be made of a metal including copper, and a plating layer containing nickel (Ni) may be formed on the surface of the metal plate.

At this time, the brazing brazing material 170 may be melted on the metal plate to be a brazing joint.

At this time, the brazing brazing material 170 is BCuP-5 (Ag-Cu-P-based, Ag:Cu:P=15:80:5), BAg-7 (Ag-Cu-Zn-Sn-based, Ag:Cu: Zn:Sn=56:22:17:5), BAg-8 (Ag-Cu-based, Ag:Cu=72:28) may be formed of a metal.

In addition, referring to FIG. 4 , the brazing brazing material 170 makes the metal plate, the ceramic tube case, the metal terminal, and the fuse body to be melted and joined by heat treatment, so the shape of the brazing brazing material 170 is variable rather than fixed. can be

In this case, the ceramic defogger may be made of a powder containing silicon oxide (SiO ₂ ).

The ceramic extinguishing agent may serve to extinguish an arc generated when an overcurrent is applied.

In the arc extinguishing process, when a high inrush current is applied from the outside, when the fuse inside the fuse is melted, a strong arc is generated and high heat is generated. At this time, the extinguishing agent melts and the arc can be removed.

A method of manufacturing a high-power fuse according to an embodiment of the present invention will be described.

5 is a flowchart of a method of manufacturing a high-power fuse according to an embodiment of the present invention.

Referring to Figure 5,

Preparing a ceramic tube case (S100); forming a molybdenum/manganese (Mo/Mn) metallizing layer by coating both ends of the ceramic tube case with a molybdenum/manganese (Mo/Mn) paste and then heat-treating (S200); Heat treatment after coating with nickel (Ni) plating or nickel (Ni) paste on the ceramic tube case in which the molybdenum/manganese (Mo/Mn) metallizing layer is formed (S300); A metal plate, a brazing brazing material for sealing the ceramic tube case, and the fuse fuse body are assembled at both ends of the ceramic tube case in which the molybdenum/manganese (Mo/Mn) and nickel (Ni) layers are formed, and the metal terminal at one end A primary assembly and brazing bonding step (S400) of assembling a brazing brazing material for sealing and melting and bonding by heat treatment; After putting the defrosting agent powder inside the ceramic tube case that has been assembled and brazed in the first place, the brazing brazing material is melted by heat treatment to seal the metal plate, the fuse body, and the metal terminal at the opposite end. It may include a car assembly and brazing bonding step (S500).

As a first step, it may include the step of providing a ceramic tube case. (S100)

As a second step, it may include the step of heat-treating after coating both ends of the ceramic tube case with molybdenum/manganese (Mo/Mn) paste. (S200)

Mo/Mn paste may be used as a process of forming a metal layer by applying a metal paste to both ends of the ceramic tube case and heat-treating it.

In addition, after printing using a screen mesh of 100 to 250 mesh, drying it sufficiently at about 100 ° C to 150 ° C, heat treatment at a high temperature of about 1400 ° C to 1500 ° C in a hydrogen and nitrogen mixed gas atmosphere, Mo-Mn metal in the ceramic case layers can be fixed.

The thickness of the Mo/Mn layer may be 20 to 30 μm.

The reason for forming the Mo/Mn metal layer on the ceramic case is that the ceramic case has a different crystal structure from the metal material. This is because the bonding between the ceramic case and the metal material can be increased.

As a third step, it may include a step of heat-treating after coating with nickel (Ni) plating or nickel (Ni) paste on the ceramic tube case in which the Mo/Mn metal layer is formed (S300).

For optimal bonding with the brazing method, the brazing brazing material should be well wetted on the surface of the base material. That is, it should have good wettability.

In order to improve the wettability and reactivity with the filler metal on the metallizing layer, nickel (Ni) plating or a nickel (Ni) paste may be applied to form a nickel (Ni) thin film.

In the present invention, a thin film may be formed using both a nickel (Ni) plating method and a nickel (Ni) paste application method.

After the nickel (Ni) plating and nickel (Ni) paste application, heat treatment is performed at about 750° C. to 850° C. in a hydrogen and nitrogen mixed gas atmosphere to stabilize the nickel layer.

As a fourth step, a metal plate, a brazing material for sealing the ceramic tube case, and the fuse fuse body are assembled at both ends of the ceramic tube case in which the molybdenum/manganese (Mo/Mn) and nickel (Ni) layers are formed, and one end It may include a primary assembling and brazing bonding step (S400) of assembling a brazing brazing material for sealing the metal terminal, melting and bonding by heat treatment.

The high-power fuse is intended to be joined through a brazing method.

In the first assembling and brazing bonding step, the ceramic tube case, the metal plate, and the fusing body are joined, and depending on the manufacturing method, even the metal terminals (Securing Cap and Securing Lug) in one direction can be joined.

Each high-power fuse component is assembled using an assembling jig, and is put into a brazing junction furnace while being assembled in the assembling jig to be brazed.

In this case, the assembling jig means a device or auxiliary device capable of efficiently assembling by properly placing the processed parts in a predetermined position.

At this time, the brazing junction furnace means a heat treatment furnace.

The brazing joining method is a method of joining by adding brazing brazing material below the melting point of the base metal to be joined at a temperature of 450°C or higher, and a metal alloy with a lower melting point than the base material is used as the base material without melting the base material. It can be joined by melting it through heat treatment by putting it between the and the base material.

In general, when brazing joints reach a certain temperature (BRAZING TEMPERATURE), brazing brazing material melts and seeps between both base materials and can be brazed.

At this time, the property indicating the degree of affinity between the base material and the brazing brazing material can be expressed as wetting, and the capillary phenomenon is a phenomenon in which the brazing material flows between the joint gap of both base materials and the micropores on the surface of the base material. Both base materials can be joined by this.

In the present invention, since a nickel (Ni) thin film is formed on the ceramic tube case to improve wettability, the metal plate positioned between the ceramic tube case and the metal terminal can be brazed by melting the brazing material.

The brazing bonding may be performed by heat treatment at a temperature of 600°C to 850°C in a hydrogen or nitrogen atmosphere.

In this case, when BAg-8 (Ag-Cu-based, Ag:Cu=72:28) is used as the brazing brazing material, it can be joined by heat treatment at 800°C to 850°C.

Since brazing is performed at 800° C. to 850° C., metal parts such as metal plates and metal terminals (Securing Cap and Securing Lug) can be made of pure copper of Cu 99.5% or more, copper, etc.

In addition, BCuP-5 (Ag-Cu-P-based, Ag:Cu:P=15:80:5), BAg-7 (Ag-Cu-Zn-Sn, Ag:Cu:Zn:Sn) having a slightly lower melting point =56:22:17:5), etc., can be joined at a lower temperature than the brazing temperature by lowering the brazing temperature to 600°C to 700°C.

In this case, the Securing Cap has the effect of reducing the cost by applying a mixture of copper (Cu) and brass (Cu-Z series, 73 brass or 64 brass) rather than pure copper with copper (Cu) content of 99.5% or more. have.

At this time, pure copper with low electrical resistance (copper Cu content of 99.5% or more) can be applied to the fuse and securing lug.

When the primary assembly and brazing bonding are completed, a primary brazing product may be created.

In the fifth step, after putting the defrosting agent powder inside the ceramic tube case that has been assembled and brazed, the metal plate, the fuse element, and the metal terminal are assembled at the opposite end to seal the metal terminal. It may include a secondary assembling and brazing bonding step (S500) that is melted by heat treatment.

In the stage of completing the fuse finished product, after filling the inside of the primary brazing product after the primary brazing connection has been completed, the metal terminals (Securing Cap and Securing Lug) are assembled and the brazing material is inserted in the same way as in the primary brazing. After heat treatment in a brazing furnace, it can be joined.

The brazing joint can be joined by heat treatment at 600° C. and 850° C. temperature in a hydrogen and nitrogen atmosphere.

6 to 7 may show a perspective view and a cross-sectional view of the first assembled brazing product.

6 is a perspective view and a cross-sectional view of a primary assembled brazing product according to an embodiment of the present invention.

7 is a perspective view and a cross-sectional view of a primary assembled brazing product to which a metal terminal is attached according to an embodiment of the present invention.

6 and 7 , it can be seen that the metal plate has a curved shape and is joined to both ends of the ceramic case and the fuse body.

Even if the metal plate (Disc Plate) has a flat shape, bonding is possible, but when the metal plate has a flat shape, a bonding area with the ceramic tube case is increased.

As such, when the metal plate has a flat shape and the contact area is increased, the stress is turned on due to the difference in the coefficient of thermal expansion between the metals, which may cause microcracks or destruction in the portion adjacent to the junction between the ceramic tube case and the metal plate during brazing. have.

However, if the thickness of the ceramic case is thick enough to overcome such stress, the metal plate may have a flat shape.

However, it is a much more advantageous shape in terms of reducing the bonding area between the ceramic and the metal plate by making the metal plate have a curved shape, and alleviating the stress caused by thermal expansion during brazing to prevent cracking and destruction of the ceramic during brazing bonding. can

10 is an enlarged cross-sectional view of a junction of a high-power fuse taken by FE-SEM to show a molten state of brazing brazing material according to an embodiment.

Referring to FIG. 10, it can be seen that the brazing brazing material is melted in the brazing joint between the ceramic tube case and the metal plate to form a neck in the shape shown below.

At this time, by controlling the thickness of the metal plate having a curved structure rather than a flat shape on the bonding surface, the stress caused by the difference in the coefficient of thermal expansion between the ceramic and the metal can be minimized.

However, if the thickness is too thin, deformation may occur in the metal plate.

The neck of the joint portion can secure an appropriate shape and bonding force by adjusting the amount of brazing brazing material.

In addition, referring to FIG. 7 , a shape in which a metal terminal is coupled in one direction can be confirmed.

That is, in the first assembling and brazing bonding step (S400), in addition to brazing the ceramic tube case, the metal plate, and the fuse body according to the manufacturing method, the ceramic tube case, the metal plate, the fuse body and the metal terminal (Securing) Cap and Securing Lug) can be brazed.

8 is a cross-sectional view of a high-power fuse showing a secondary assembly and brazing junction according to an exemplary embodiment.

Referring to FIG. 8 , the internal space of the high-power fuse on which the secondary brazing junction is completed may be indicated by 200 .

After filling the inner space of the ceramic tube case of the primary brazing product that has undergone the primary assembly and brazing bonding steps, the metal terminals (Securing Cap and Securing Lug) are assembled and brazed in the same manner as in the primary assembly and brazing bonding steps. After inserting, it can be heat treated in a brazing furnace to be brazed.

A space of 200 in FIG. 8 may be filled with ceramic defogger powder.

An optimal extinguishing effect may be achieved by filling 90% or more of the inner space of the fuse 200 with an amount of the extinguishing agent to be filled.

At this time, the short arrow in FIG. 8 may indicate a brazing joint.

The short arrows indicate the side where the corners of the lower part of the metal plate are brazed to both ends of the ceramic tube case, the side where the upper outer edge of the metal plate at both ends and the metal terminal are brazed together, and the upper outer surface of the metal plate at both ends. The central portion and the fuse may represent brazed surfaces.

9 is a perspective view of a high-power fuse that is secondary assembled and brazed according to an embodiment.

Referring to FIG. 9 , a finished product of a high-power fuse that is secondary assembled and brazed can be seen.

11 is a perspective view illustrating a structure of a high-power fuse sample manufactured according to an embodiment of the present invention and a size of the high-power fuse sample.

Table 1 shows the names and sizes of the high-power fuse components indicated by the alphabets shown in FIG. 11 .

Table 1 below is a comparison table in which the 110% conduction performance of the high-power fuse sample was tested.

No. 1st production sample 2nd production sample 3rd production sample before the exam
Resistance (mΩ) after the exam
Resistance (mΩ) before the exam
Resistance (mΩ) after the exam
Resistance (mΩ) before the exam
Resistance (mΩ) after the exam
Resistance (mΩ) One 0.315 0.310 0.338 0.334 0.346 0.340 2 0.313 0.311 0.348 0.345 0.332 0.329 3 0.323 0.321 0.337 0.334 0.337 0.335 4 0.341 0.339 0.324 0.320 0.331 0.328 5 0.346 0.342 0.332 0.328 0.342 0.340 Average 0.328 0.325 0.336 0.332 0.338 0.334 resistance
rate of change (%) -0.92% -1.07% -0.95%

The 110% energization test of the fuse shall not operate for more than 1 hour at a severe current corresponding to 110% of the rated current. That is, the fusible element of the fuse should not be blown.

In general, the fuse must not operate during the 110% energization test to pass, and the resistance was measured to check the characteristic change.

Table 2 below is a comparative table in which 210% and 1000% fusing properties of high-power fuse samples were tested.

This test classifies the performance of the fuse by measuring the time it takes for the fuse to operate by applying a current corresponding to 210% and 1000% of the rated current to the fuse. It is classified into a fast acting type, a slow blow type, a time-lag type, and a very time-lag type.

1st production sample 2nd production sample 3rd production sample 210% uptime 11.016 sec 11.582 sec 11.492 sec 1000% running time 29.0 msec 31.0 msec 30.0 msec

In Table 2 above, based on the rated current of 300A, the 210% operation time represents the fuse operation (melting of the fuse) time when a current corresponding to 210% of the rated current is applied, and the 1000% operation time corresponds to 1000% of the rated current. It can represent the fuse operation (melting of the fuse) time when the current is applied.

Also, in general, the classification according to the fuse operation time is regulated within 60 sec for 210% of the rated current for a delayed-acting fuse, and 20 msec or longer for a melting time of 1000% of the rated current.

Referring to Table 2, the high power fuse has an operating time of 11 sec when 210% of the rated current is applied, and an operating time when 1000% of the rated current is applied through the test results for the 210% and 1000% fusing characteristics of the high power fuse sample. It can be confirmed that this is 30 msec.

Accordingly, the characteristics of the high-power fuse can be confirmed as a complete time-lag type fuse.

The msec is milliseconds.

The delayed operation characteristic of the high-power fuse may exhibit the effect of stably and efficiently configuring a system and extending the lifespan of the fuse by controlling unnecessary fuse operation.

Table 3 below is a table comparing the breaking capacity comparison test results of high-power fuse samples.

1st production sample 2nd production sample 3rd production sample Applied breaking capacity (DC450V at A) 20 kA 30 kA 30 kA Traces of breakage and burnout (judgment) None (Pass) None (Pass) None (Pass)

The breaking capacity of a fuse is the limiting strength against the inrush current flowing into the fuse under the rated voltage. It means the maximum current value that does not cause damage or burnout of the ceramic case when the fuse operates and the fuse is blown when the current is applied. Referring to Table 3, it was confirmed that even when an inrush current of 30kA was applied at DC450V, the ceramic case of the fuse did not break or burn out, and it was confirmed that it had the ability to break up to 30kA class.

Table 4 below is a table comparing discharge voltage and insulation resistance test results of high-power fuse samples.

In general, a voltage corresponding to 1/2 of the voltage (discharge voltage) when electricity is finally generated by gradually increasing the voltage to both ends of the sample where the fuse operates and the fuse is fused is defined as the rated voltage of the fuse.

In addition, when a voltage corresponding to twice the target voltage is applied to both ends of the sample in which the fuse of the fuse is shorted in operation and the resistance is 0.1MΩ or more, it is stipulated that insulation is secured.

No Exam Classification 1st production sample 2nd production sample 3rd production sample One Discharge voltage (kV) 1.68 1.70 1.73 Insulation resistance (Ω) 7.201˚10 ¹¹ 7.352˚10 ¹¹ 7.539˚10 ¹² 2 Discharge voltage (kV) 1.98 1.78 1.99 Insulation resistance (Ω) 6.326˚10 ¹¹ 6.581˚10 ¹³ 8.552˚10 ¹⁴ 3 Discharge voltage (kV) 2.03 2.11 2.21 Insulation resistance (Ω) 8.732˚10 ¹¹ 1.595˚10 ¹² 9.268˚10 ¹⁵

Referring to Table 4 above, after the breaking capacity test, when a voltage of at least 1.68 kV is applied to the sample in which the fuse fuse element is blown, the fuse is discharged, so the rated voltage can be evaluated as about 800V, which is 1/2. In addition, when a voltage equal to or more than twice 800V is applied, the insulation resistance of the fuse is at least 6.326˚10 ¹¹ Ω, which is much higher than 0.1MΩ, which can be evaluated as securing complete insulation after fusing the fuse.

From the results of Tables 3 and 4 above, it is possible to show the effect of greatly improving the rated voltage and breaking capacity of the fuse by securing a strong bonding force between the ceramic case and the metal part through brazing.

Table 5 below is a table showing the performance test results of the primary, secondary and tertiary high-power fuse samples.

Item 1st production sample 2nd production sample 3rd production sample 210% operation time (sec) 11.016 11.582 11.492 1000% operation time (msec) 29.0 31.0 30.0 110% Current test resistance change rate (%) -0.92% -1.07% -0.95% Breaking capacity (kA) 20 30 30 Insulation resistance (Ω) Minimum 6.326˚10 ¹¹ Minimum 7.352˚10 ¹¹ Minimum 7.539˚10 ¹² Discharge voltage (kV) Minimum 1.68 Minimum 1.70 Minimum 1.73 Rated voltage (V) 800 or more 800 or more 800 or more

The above performance test was conducted using an 800V 8000A DC power supply device. Referring to Table 5, the characteristics of a time-lag type fuse with a rated voltage of 800V class and a breaking capacity of 30kA class can be confirmed according to the performance test results.

Table 6 below is a table showing the temperature rise test results of high-power fuse samples.

1st production sample 2nd production sample 3rd production sample temperature before test 23.2 ℃ 22.3℃ 27.0℃ final fusing temperature 105.1℃ 98.3℃ 102℃ temperature difference 81.9 ℃ 76 ℃ 75 ℃

According to the international safety standards of fuses, the difference between the temperature before fuse operation and the temperature at the time of final fusing must be within 135 ℃, and in the field of secondary batteries, it is required to be managed within 85 ℃. Referring to Table 6 above, In the sample fusing temperature test, the difference between the pre-test temperature and the final fusing temperature is analyzed within 135 ℃ and managed within 85 ℃, so it can be judged that safety in the secondary battery field has been secured.

The above description of the present invention is for illustration, and those of ordinary skill in the art to which the present invention pertains can understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented in a dispersed form, and likewise components described as distributed may be implemented in a combined form.

The scope of the present invention is indicated by the following claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention.

10: fuse
10a: fuse with a transverse cross-section shown
10b: fuse shown in longitudinal section
110: Securing Lug (fixing lug metal terminal)
120: Securing Cap (fixing cap metal terminal)
130: ceramic tube case
140: metal plate (Disc Plate)
150: fusible
160: ceramic defogger powder
170: brazing brazing material

Claims (12)

a ceramic tube case formed to penetrate through the inside of the cylindrical shape;
a fuse body accommodated in the ceramic tube case and fused when an inrush overcurrent is applied;
a metal terminal fitted into both ends of the ceramic tube case and closely coupled to the metal terminal and electrically connected to the fuse body;
a ceramic extinguishing agent that is filled in the ceramic tube case and extinguishes an arc generated when the fuse element is melted; and
and a metal plate positioned between the ceramic tube case and the metal terminal at both ends of the ceramic tube case,
The metal plate is a high power fuse, characterized in that one region of the lower surface and the ceramic tube case are brazed together, and one region of the upper surface is brazed to the metal terminal and the fuse body. According to claim 1,
The high-power fuse, characterized in that the metal plate, the ceramic tube case, the fuse fuse element, and the metal terminal are melted and joined by heat treatment using a brazing brazing material. According to claim 1,
The ceramic tube case is made of a material containing an alumina-based oxide (Al ₂ O ₃ ). The method of claim 1,
The high-power fuse, wherein the fuse fuse body is made of a metal containing copper (Cu). According to claim 1,
wherein the metal plate is made of a metal containing copper, and a plating layer containing nickel (Ni) is formed on the metal plate. According to claim 1,
The metal terminal is made of a metal containing copper, and a plating layer containing nickel (Ni) is formed on the metal terminal. According to claim 1,
The ceramic extinguishing agent is a high power fuse, characterized in that made of a powder containing silicon oxide (SiO ₂ ). According to claim 1,
The high power fuse, characterized in that the metal plate has a curved top shape, and a brazing brazing material is melted between the metal plate and the ceramic tube case to form a strong brazing joint. According to claim 1,
The high-power fuse is a high-power fuse, characterized in that it has a breaking capacity of 30 kA or more. According to claim 1,
The high-power fuse is a high-power fuse, characterized in that it has a rated voltage of DC 800V or more. providing a ceramic tube case;
forming a molybdenum/manganese (Mo/Mn) metallizing layer by coating both ends of the ceramic tube case with a molybdenum/manganese (Mo/Mn) paste and then heat-treating;
heat-treating after coating with nickel (Ni) plating or nickel (Ni) paste on the ceramic tube case in which the molybdenum/manganese (Mo/Mn) metallizing layer is formed;
A metal plate, a brazing brazing material for sealing the ceramic tube case, and the fuse fuse body are assembled at both ends of the ceramic tube case in which the molybdenum/manganese (Mo/Mn) and nickel (Ni) layers are formed, and the metal terminal at one end A primary assembly and brazing bonding step of assembling a brazing brazing material for sealing and melting and bonding by heat treatment; and
After putting the defrosting agent powder inside the ceramic tube case that has been assembled and brazed, the metal plate, the fuse body and the metal terminal are assembled at the opposite end to seal the metal terminal, and the brazing material is melted by heat treatment. A method of manufacturing a high-power fuse comprising a; secondary assembling and brazing bonding steps. 12. The method of claim 11,
The high-power fuse manufacturing method, characterized in that the metal plate has a curved top shape and the brazing brazing material is melted to form a brazing joint.

Images