A high voltage power fuse and a method for manufacturing the same

Abstract

The present invention provides a high-voltage power fuse, comprising an insulating shell with an accommodating cavity inside, an external electrode, a fuse electrically connected to the external electrode and a plurality of isolation bands for breaking arcs, wherein the fuse comprises a fuse part, and the fuse part is located in the accommodating cavity; the isolation band is arranged on the fuse, and an isolation band is arranged between the external electrode and the adjacent fuse part, and the material of the isolation band contains flame retardant material, and the isolation bands are symmetrically arranged on the upper surface and the lower surface of the fuse respectively; the present invention also provides a method for manufacturing a high-voltage power fuse; by arranging the isolation band on the fuse, the diffusion of vaporized metal in the arc generated by each fuse part after melting can be blocked, and the arc generated by each fuse part can be effectively blocked, so as to avoid the safety hazards such as explosion, cracking, or burning of the shell caused by the continuous extension and connection of the arc to form a higher energy arc layer; the arc energy in the fuse shell is dispersed, and its pressure resistance performance and safe breaking capacity are further improved.

Description

Technical Field

[0001] The invention relates to the field of electrical protection elements, and in particular provides a high-voltage power fuse. Background Art

[0002] Fuses are widely used in overcurrent protection of various electronic components. Metal conductors are used as fuses in series in the circuit. When an abnormality occurs in the circuit and the current exceeds the specified value, the fuse will automatically melt, disconnecting the circuit and protecting the electrical appliances.

[0003] Electric vehicles, also known as electric-driven vehicles, are usually referred to as vehicles that use batteries as energy sources, and use controllers, motors and other components to convert electrical energy into mechanical energy to control the current size and change the speed. Common electric vehicles include one-wheeled electric vehicles, two-wheeled electric vehicles, three-wheeled electric vehicles and four-wheeled electric vehicles. In view of the increasing application of electric vehicles, the safety of their circuits will directly affect the safety of the electric vehicles themselves and their passengers. With the increase in voltage in the circuit and the continuous expansion and changes in the power system, the existing fuses cannot withstand the energy of the voltage increase during the fusing process, especially under overcurrent conditions. The energy accumulated by the continuous extension of the arc and the long time can cause the shell of the fuse to explode, crack, or burn, which are potential safety hazards.

[0004] In order to minimize the extension and duration of arc discharge, loose arc-extinguishing materials, such as quartz sand, are usually added to the housing where the fuse is located to absorb the vaporized metal that maintains the arc. However, filling with loose arc-extinguishing materials alone may not be enough to extinguish the arc generated in the fuse, let alone prevent the arc from continuing to extend, especially in the limited housing size of the fuse in the field of electric vehicles, higher voltage conditions, etc. At the same time, in electric vehicle applications, in a long-term vibration environment, the fuse and the loose sand-like material will have friction, causing the fuse to wear and make the fuse lose its function. Summary of the invention

[0005] In order to overcome the defects of the prior art, an object of the present invention is to provide a high voltage power fuse with better arc extinguishing performance.

[0006] The present invention provides a high voltage power fuse, comprising:

[0007] An insulating shell, wherein a containing cavity is provided inside the insulating shell;

[0008] an outer electrode, at least a portion of which is located outside the insulating shell;

[0009] A fuse, the fuse is electrically connected to the external electrode, the fuse comprises a fuse part, and the fuse part is located in the accommodating cavity;

[0010] The high-voltage power fuse also includes a plurality of isolation bands for arc breaking, which are arranged on the fuse element, and are arranged between the outer electrode and the adjacent fuse part. The isolation bands for preventing metal diffusion contain flame retardant materials, and the isolation bands are symmetrically arranged on the upper surface of the fuse element and the lower surface of the fuse element. The fuse plate with double-sided fuse coating or the fuse piece or fuse plate made of metal will generate arcs on the upper surface and the lower surface. At this time, the isolation bands are respectively arranged on the upper surface of the fuse element and the lower surface of the fuse element to ensure that the locations where the arcs are generated are separated by the isolation bands, thereby improving the arc breaking efficiency. In some embodiments, the isolation bands on the upper surface and the lower surface are symmetrically arranged.

[0011] The fuse is in the shape of a sheet or a plate, and the isolation zone is transversely arranged on the fuse.

[0012] The insulating shell includes an upper shell, a lower shell, a front plate and a rear plate, wherein the "concave" upper shell and the "concave" lower shell respectively contain an inner cavity, the upper shell and the lower shell are symmetrically buckled, and at the same time, they are surrounded by the front plate and the rear plate to form the accommodating cavity, and the external electrode is arranged between the upper shell and the lower shell.

[0013] The outer electrode is provided with a first mounting hole for electrically connecting to the circuit and two second mounting holes for fixing the outer electrode to the insulating shell. The lower shell is provided with a fixing hole adapted to the second mounting hole. The outer electrode is fixedly connected to the lower shell through a connecting piece, which can be a rivet.

[0014] By providing an isolation zone on the fuse, the arc can be quickly cut off, minimizing the extension and duration of the arc discharge.

[0015] In some embodiments, the fuse is in the form of a sheet or plate, and the isolation zone is transversely arranged on the fuse. Transversely means that the length direction of the isolation zone intersects with the length direction of the fuse. Preferably, the length direction of the isolation zone is perpendicular to the length direction of the fuse.

[0016] The length of the isolation zone is not less than the width of the fuse. Preferably, the length of the isolation zone is equal to the width of the fuse.

[0017] In some embodiments, the height of the isolation zone is 5 to 50 times the thickness of the fuse, and / or the width of the isolation zone is 5 to 60 times the thickness of the fuse. If it is too wide, the diffusion cross section of the metal will be reduced, which is not conducive to the arc extinguishing agent's absorption of metal vapor; if it is too narrow, it will not be enough to isolate the conductive zone into a separation section with a sufficiently high resistance; if it is too low, the diffused metal will form a continuous conductive layer containing a high concentration of metal vapor above the isolation zone, and the thickness of the isolation zone must be higher than the thickness of the metal diffusion layer at the maximum breaking energy; if it is too high, it will increase the difficulty and cost of processing. The technical solution described in this text can reduce the material consumption while ensuring the arc extinguishing effect.

[0018] The material of the isolation belt for preventing metal diffusion also includes one or more mixtures of silicone rubber, silicone sealant and room temperature vulcanized silicone. The thermal decomposition temperature of silicone rubber with flame retardant material is significantly higher than that of silicone resin used in the prior art. When comparing the flame retardant properties of different materials with a flame spray gun, silicone resin is easily decomposed into ash by flame. Silicone rubber containing flame retardant can withstand flame burning for several seconds without powdering, and can become a high-quality high-temperature metal steam isolation belt.

[0019] In some embodiments, the fuse part includes a plurality of fuse part groups arranged in series, each of the fuse part groups includes one fuse part or a plurality of fuse parts arranged in parallel, and the isolation zone is arranged between adjacent fuse part groups to further improve the efficiency of cutting off the arc.

[0020] There can be one fuse or multiple fuses connected in parallel or in series. In some embodiments, the high-voltage power fuse includes two or more fuses connected in parallel, and each fuse is provided with the isolation band.

[0021] In some embodiments, a plurality of fuses are arranged side by side from top to bottom, and the sum of the height of the isolation zone located at the lower surface of the upper fuse and the height of the isolation zone located at the corresponding position of the upper surface of the lower fuse is not less than the distance between the lower surface of the upper fuse and the upper surface of the lower fuse. With this arrangement, it can be ensured that the arc in the space between two adjacent fuses is completely isolated, ensuring that there is no arc leakage or overflow to the position of the external electrode at the end.

[0022] In some embodiments, the isolation zone located on the lower surface of the upper fuse element conflicts with the isolation zone located at a corresponding position on the upper surface of the lower fuse element.

[0023] In some embodiments, the external electrode is plate-shaped, and the fuse includes a first fuse and a second fuse arranged in parallel, two ends of the first fuse are respectively fixedly connected to the upper surfaces of the external electrodes on both sides, and two ends of the second fuse are respectively fixedly connected to the lower surfaces of the external electrodes on both sides, and the isolation band on the lower surface of the first fuse conflicts with the isolation band at the corresponding position of the upper surface of the second fuse.

[0024] In some embodiments, the accommodating cavity is further filled with arc-extinguishing material, and the arc-extinguishing material includes a filler and an adhesive for bonding the filler.

[0025] The setting of the isolation belt can block the diffusion of metal vapor in the arc to the arc extinguishing material in the local area, avoiding the formation of continuous arcs with high metal content. The setting of the isolation belt and the arc extinguishing material containing adhesive can not only allow the arc extinguishing material to absorb metal vapor to achieve the purpose of arc extinguishing, but also prevent the formation of a continuous high-conductivity layer with high metal vapor concentration around the fuse.

[0026] The arc-extinguishing material is a whole rather than loose particles, which can prevent mechanical friction with the fuse in practical applications and reduce the risk of fuse failure.

[0027] The filler can be selected from a mixture of one or more quenching materials such as aluminum oxide, silicon oxide, quartz sand, etc. The adhesive can be composed of a flame retardant material, a wetting agent, a bonding material and water. Among them, the flame retardant material can be a mixture of one or more of nano aluminum hydroxide, nano magnesium hydroxide, melamine and its derivatives, dicyandiamide and its derivatives, etc.; the wetting agent can be a mixture of one or more of sodium lauryl sulfate, dihexanolamide, heavy alkylbenzene sulfonate, linear alkylbenzene sulfonate, etc.; the bonding material can be a mixture of one or more of aluminum hydroxide sol, silica sol, sodium polysilicate, potassium, sodium silicate, borate, phosphate, etc.

[0028] In some embodiments, the arc extinguishing material contains 60-98% by mass of the filler and 2-32% by mass of the binder. On the premise of ensuring good arc extinguishing / quenching effect, the integrity of the filler is ensured to ensure that it will not loosen, thereby avoiding wear of the fuse during vibration.

[0029] The adhesive comprises less than or equal to 20% by mass of a flame retardant material, less than or equal to 20% by mass of a wetting agent, and 10-60% by mass of a bonding material and water.

[0030] A method for manufacturing a high voltage power fuse comprises the following steps:

[0031] A fuse having a plurality of fuse sections connected in series is manufactured, and isolation bands are symmetrically provided on the upper surface and the lower surface of the fuse;

[0032] A shell containing an inner cavity is made of an insulating substrate, the shell is in a "concave" shape, two sides of the opening direction of the inner cavity are two bosses, and the shell includes an upper shell and a lower shell;

[0033] An outer electrode having a first mounting hole for electrical connection with a circuit is made of a conductive metal;

[0034] The two outer electrodes are fixedly connected to the bosses of the lower shell through connecting pieces respectively;

[0035] The two ends of the fuse are respectively connected to the two outer electrodes, and the fuse is located at a corresponding position of the inner cavity;

[0036] The upper shell is fixedly connected to the lower shell through a connecting piece to form a main body, and the inner cavity of the upper shell is arranged opposite to the inner cavity of the lower shell to form an accommodating cavity for accommodating the fuse;

[0037] A planar cover plate is made of an insulating substrate, wherein the cover plate comprises a front plate and a rear plate;

[0038] The rear plate is bonded to the upper shell and the lower shell respectively by adhesive, and the rear plate forms the rear wall of the accommodating cavity;

[0039] Adding filler and adhesive into the accommodating cavity to form a blank, wherein the filler is a quenching material, and the adhesive comprises a flame retardant material, a wetting agent, a bonding material and water;

[0040] Heating the blank at a temperature of 80-120° C. for 60-300 minutes, wherein the filler and the adhesive are cured to form an integrated arc-extinguishing material;

[0041] The front plate is bonded to the upper shell and the lower shell respectively by adhesive, and the front plate forms the front wall of the accommodating cavity and seals the accommodating cavity to manufacture the high-voltage power fuse.

[0042] In some preferred embodiments, a plurality of the fuses connected in parallel are arranged side by side from top to bottom and connected in parallel, and the isolation zone located on the lower surface of the upper fuse conflicts with the isolation zone located at a corresponding position on the upper surface of the lower fuse.

[0043] The beneficial effects of the present invention are:

[0044] Compared with the prior art, the high-voltage power fuse provided by the present invention has the following technical effects:

[0045] This technical solution is designed to block the diffusion of vaporized metal in the arc generated by each fuse after melting by setting an isolation belt on the fuse body to prevent metal diffusion. It can effectively block the arc generated by each fuse part, avoid the safety hazards such as shell explosion, cracking, or burning caused by the continuous extension of the arc to form a higher energy arc layer; disperse the arc energy in the fuse shell, and further improve its pressure resistance and safe breaking capacity. The arc extinguishing material is a whole rather than loose particles, which can prevent mechanical friction with the fuse in actual applications and reduce the risk of fuse failure. In addition, the high-voltage power fuse of the present application can also be used in equipment such as balancing vehicles, charging piles, power converters (powerconversion) and wind turbines. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a three-dimensional structural schematic diagram of the high-voltage power fuse in the present invention;

[0047] Figure 2 It is a structural schematic diagram of a high-voltage power fuse according to Embodiment 1 of the present invention;

[0048] Figure 3 A schematic diagram of the fuse structure of a high-voltage power fuse according to Embodiment 1 of the present invention;

[0049] Figure 4 This is an X-RAY image of the high-voltage power fuse after it is blown according to the first embodiment of the present invention;

[0050] Figure 5 It is a perspective three-dimensional structural schematic diagram of a high-voltage power fuse according to the first embodiment of the present invention;

[0051] Figure 6 It is a structural schematic diagram of a high-voltage power fuse according to Embodiment 2 of the present invention;

[0052] Figure 7 It is a perspective three-dimensional structural schematic diagram of a high-voltage power fuse according to the second embodiment of the present invention;

[0053] Figure 8 This is an X-RAY image of the high-voltage power fuse before it is blown in the second embodiment of the present invention;

[0054] Fig. 9 This is an X-RAY image of the high-voltage power fuse after it is blown in the second embodiment of the present invention;

[0055] Fig.10 It is a structural schematic diagram of a high-voltage power fuse according to Embodiment 3 of the present invention;

[0056] Fig.11 It is a schematic cross-sectional structure diagram of a high-voltage power fuse according to Embodiment 3 of the present invention;

[0057] Fig.12 This is an X-RAY image of the high-voltage power fuse before it is blown in the third embodiment of the present invention;

[0058] Fig.13 This is an X-RAY image of the high-voltage power fuse after it has been blown in Example 3 of the present invention.

[0059] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods. DETAILED DESCRIPTION

[0060] The present invention can be further understood by the specific examples of the present invention given below, but they are not intended to limit the present invention.

[0061] Embodiment 1

[0062] like Figure 1-5 As shown, the present invention provides a high-voltage power fuse, comprising an insulating housing 2, an outer electrode 1, a fuse element 6, an isolation zone 4 and an arc-extinguishing filler 5.

[0063] The insulating shell 2 includes an upper shell, a lower shell, a front plate and a rear plate, wherein the "concave" upper shell and the "concave" lower shell respectively contain an inner cavity, and the two sides of the opening direction of the inner cavity are two bosses, the upper shell and the lower shell are symmetrically buckled, and the bosses at the corresponding positions of the two shells are relatively fitted, and at the same time, the front plate and the rear plate are enclosed to form the accommodating cavity, and the external electrode 1 is arranged between the upper shell and the lower shell. The upper shell and the lower shell are fixedly connected by rivets 3.

[0064] At least a portion of the outer electrode 1 is located outside the insulating shell 2; the outer electrode is provided with a first mounting hole for electrically connecting to the circuit and two second mounting holes for fixing the outer electrode to the insulating shell, the first mounting hole is located outside the insulating shell 2, and a fixing hole adapted to the second mounting hole is provided on the lower shell, and the outer electrode is fixedly connected to the lower shell through a connecting member, which can be a rivet.

[0065] The sheet-shaped or plate-shaped fuse 6 is electrically connected to the external electrode 1. The fuse 6 includes a fuse part 61. The fuse part 61 with weaker structural strength is located in the accommodating cavity. In this embodiment, the fuse 6 includes three fuse part groups arranged in series, each of which includes three fuse parts arranged in parallel. An isolation belt 4 is arranged between adjacent fuse part groups. The isolation belt 4 is arranged laterally symmetrically on the upper and lower surfaces of the fuse 6 to further improve the efficiency of cutting off the arc. An isolation belt 4 is also arranged between the external electrode 1 and the nearest fuse group to prevent the arc from spreading to the position of the external electrode. The length of the isolation belt 4 is equal to the width of the fuse 6. The material of the isolation belt 4 containing a flame retardant to prevent metal diffusion contains one or more mixtures of silicone rubber, silicone sealant and room temperature vulcanized silicone.

[0066] In this embodiment, the height of the isolation zone 4 is 5 to 50 times the thickness of the fuse 6, and the width of the isolation zone 4 is 5 to 60 times the thickness of the fuse 6, which can reduce the material consumption while ensuring the arc extinguishing effect.

[0067] The arc extinguishing material includes a filler and an adhesive for bonding the filler.

[0068] The arc-extinguishing material is a whole rather than loose particles, which can prevent mechanical friction with the fuse in practical applications and reduce the risk of fuse failure.

[0069] The filler can be selected from a mixture of one or more quenching materials such as aluminum oxide, silicon oxide, quartz sand, etc. The adhesive can be composed of a flame retardant material, a wetting agent, a bonding material and water. Among them, the flame retardant material can be a mixture of one or more of nano aluminum hydroxide, nano magnesium hydroxide, melamine and its derivatives, dicyandiamide and its derivatives, etc.; the wetting agent can be a mixture of one or more of sodium lauryl sulfate, dihexanolamide, heavy alkylbenzene sulfonate, linear alkylbenzene sulfonate, etc.; the bonding material can be a mixture of one or more of aluminum hydroxide sol, silica sol, sodium polysilicate, potassium, sodium silicate, borate, phosphate, etc.

[0070] In this embodiment, the arc extinguishing material 5 contains 60-98% by mass of the filler and 2-32% by mass of the binder.

[0071] The adhesive comprises less than or equal to 20% by mass of a flame retardant material, less than or equal to 20% by mass of a wetting agent, and 10-60% by mass of a bonding material and water.

[0072] The manufacturing method of the high-voltage power fuse of this embodiment comprises the following steps:

[0073] A fuse 6 having a plurality of series-connected fuse groups is manufactured, and isolation bands 4 are symmetrically covered on the upper surface and the lower surface of the fuse 6, respectively. The thickness of the fuse is 0.15 mm, and the height and width of the isolation bands 4 are 1.8 mm and 1.8 mm, respectively.

[0074] A shell containing an inner cavity is made of an insulating substrate, the shell is in a "concave" shape, two sides of the opening direction of the inner cavity are two bosses, and the shell includes an upper shell and a lower shell;

[0075] An outer electrode 1 is made of conductive metal and includes a first mounting hole for electrical connection with a circuit;

[0076] The two outer electrodes are fixedly connected to the boss of the lower shell through connecting pieces, respectively, and the connecting pieces can be rivets;

[0077] The two ends of the fuse are respectively connected to the two outer electrodes, and the fuse is located at a corresponding position of the inner cavity;

[0078] The upper shell is fixedly connected to the lower shell through a connecting piece to form a main body, and the inner cavity of the upper shell is arranged opposite to the inner cavity of the lower shell to form an accommodating cavity for accommodating the fuse 6;

[0079] A planar cover plate is made of an insulating substrate, wherein the cover plate comprises a front plate and a rear plate;

[0080] The rear plate is bonded to the upper shell and the lower shell respectively by adhesive, and the rear plate forms the rear wall of the accommodating cavity;

[0081] Filler and adhesive are added into the accommodating cavity to form a blank, wherein the filler is a quenching material, and the adhesive comprises a flame retardant material, a wetting agent, a bonding material and water; the filler is quartz sand, the mass fraction of the quartz sand is 70-80%, and the adhesive comprises a flame retardant material of nano-magnesium hydroxide, a wetting agent of sodium dodecylbenzene sulfonate, and a bonding material of sodium polysilicate.

[0082] heating the blank at 120° C. for 300 minutes, wherein the filler and the adhesive are solidified to form an integrated arc-extinguishing material;

[0083] The front plate is bonded to the upper shell and the lower shell respectively by adhesive, and the front plate constitutes the front wall of the accommodating cavity and seals the accommodating cavity, so as to be manufactured into the high-voltage power fuse that can be used in electric vehicles, especially electric vehicles.

[0084] like Figure 4As shown, the fuse is tested to be safely fused under 500VDC voltage / 2000A DC power supply without flying, cracking or burning. X-ray photos show that the isolation band 4 for preventing metal diffusion effectively blocks and isolates the arcs generated by each fuse part when it is fused.

[0085] Embodiment 2

[0086] like Figure 6-Figure 8 As shown, the difference between this embodiment and the first embodiment is that the fuse includes two fuses 6 arranged in parallel, the two fuses are stacked up and down, and are electrically connected to the external electrodes 1 on both sides through both ends.

[0087] Specifically, the external electrode 1 is plate-shaped, and the fuse 6 includes a first fuse and a second fuse arranged in parallel, the two ends of the first fuse are fixedly connected to the upper surfaces of the external electrodes 1 on both sides, and the two ends of the second fuse are fixedly connected to the lower surfaces of the external electrodes 1 on both sides. The sum of the height of the isolation band 4 on the lower surface of the upper fuse 6 (first fuse) and the height of the isolation band 4 at the corresponding position of the upper surface of the lower fuse 6 (second fuse) is not less than the distance between the lower surface of the upper fuse 6 (first fuse) and the upper surface of the lower fuse 6 (second fuse). In this embodiment, the thickness of the external electrode 1 is the distance between the lower surface of the end of the first fuse and the upper surface of the end of the second fuse. The thickness of the outer electrode 1 is 3.125 mm, the height of the isolation band 4 is 1.6 mm, and the sum of the heights of the two isolation bands 4 on the lower surface is 3.2 mm, which is slightly greater than the thickness of the outer electrode 1. The isolation band 4 on the lower surface of the first fuse body conflicts with the isolation band 4 at the corresponding position on the upper surface of the second fuse body (e.g. Figure 7 As shown), it is enough to prevent various arcs from flying across the middle of the isolation zone. In addition, the width of the isolation zone 4 is 2.0 mm, and the thickness of the fuse 6 is 0.15 mm.

[0088] The fuse was tested to be safe and melted under 600VDC voltage / 2000A DC power supply without blowing, cracking, or burning. Fig. 9 As shown, the X-ray photograph shows that the isolation band used to prevent metal diffusion effectively blocks and isolates the arcs generated by each fuse part when it is melted.

[0089] Embodiment 3

[0090] like Figure 10-12 As shown, the difference between this embodiment and the second embodiment is that the total thickness of the isolation bands 4 inside the two fuses 6 is smaller than the thickness of the outer electrodes 1, so that the inner isolation bands 4 cannot completely cover the outer electrodes 1 on both sides.

[0091] like Fig.13As shown in the figure, when the fuse is tested under 600VDC voltage / 2000A DC power supply, there is no explosion, cracking, or burning. However, since the total thickness of the isolation zone 4 inside the two fuses 6 is less than the thickness of the outer electrode 1, the arcs generated inside the respective fusing areas between the two fuses 6 are connected to each other to form an arc chain with large energy, and there is a phenomenon of arc spraying and leakage, which poses a safety concern.

[0092] The high-voltage power fuse provided by the present invention can block the diffusion of vaporized metal in the arc generated by each fuse part after melting by arranging an isolation zone on the fuse body to prevent metal diffusion, thereby effectively isolating the arc generated by each fuse part and avoiding the safety hazards such as shell explosion, cracking, or burning caused by the continuous extension and connection of the arc to form a higher energy arc layer.

[0093] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention are still within the scope covered by the present invention.

Claims

1. A high voltage power fuse, include: An insulating shell, wherein a containing cavity is provided inside the insulating shell; an outer electrode, at least a portion of which is located outside the insulating shell; A fuse, the fuse is electrically connected to the external electrode, the fuse comprises a fuse part, and the fuse part is located in the accommodating cavity; characterized in that: The high-voltage power fuse further includes a plurality of isolation bands for arc breaking, the isolation bands are arranged on the fuse, the isolation bands are arranged between the outer electrode and the adjacent fuse part, the material of the isolation bands contains flame retardant material, and the isolation bands are symmetrically arranged on the upper surface of the fuse and the lower surface of the fuse respectively; The high-voltage power fuse includes a plurality of fuses arranged in parallel, each of the fuses is provided with the isolation band, and the plurality of fuses are arranged in parallel from top to bottom, and the sum of the height of the isolation band located on the lower surface of the upper fuse and the height of the isolation band at the corresponding position of the upper surface of the lower fuse is not less than the distance between the lower surface of the upper fuse and the upper surface of the lower fuse.

2. The high voltage power fuse according to claim 1, Features: The fuse is in the shape of a sheet or a plate, and the isolation zone is transversely arranged on the fuse.

3. The high voltage power fuse according to claim 2, Features: The height of the isolation zone is 5 to 50 times the thickness of the fuse, and / or, The width of the isolation zone is 5 to 60 times the thickness of the fuse.

4. The high voltage power fuse according to claim 1, Features: The material of the isolation belt also includes one or more mixtures of silicone rubber, silicone sealant and room temperature vulcanized silicone.

5. The high voltage power fuse according to claim 1, Features: The fuse includes a plurality of fuse part groups arranged in series, each of the fuse part groups includes one fuse part or a plurality of fuse parts arranged in parallel, and the isolation zone is arranged between adjacent fuse part groups.

6. The high voltage power fuse according to claim 1, Features: The isolation zone located on the lower surface of the upper fuse element conflicts with the isolation zone located at a corresponding position on the upper surface of the lower fuse element.

7. The high voltage power fuse according to claim 1, Features: The external electrode is plate-shaped, and the fuse includes a first fuse and a second fuse arranged in parallel, two ends of the first fuse are respectively fixedly connected to the upper surfaces of the external electrodes on both sides, two ends of the second fuse are respectively fixedly connected to the lower surfaces of the external electrodes on both sides, and the isolation zone on the lower surface of the first fuse conflicts with the isolation zone at the corresponding position of the upper surface of the second fuse.

8. The high voltage power fuse according to any one of claims 1-5, 6-7, Features: The accommodating cavity is also filled with arc extinguishing material, and the arc extinguishing material includes a filler and an adhesive for bonding the filler.

9. The high voltage power fuse according to claim 8, Features: The arc-extinguishing material contains 60-98% by mass of the filler and 2-32% by mass of the binder.

10. The high voltage power fuse according to claim 8, Features: The adhesive comprises less than or equal to 20% by mass of a flame retardant material, less than or equal to 20% by mass of a wetting agent, and 10-60% by mass of a bonding material and water.

11. A method for manufacturing a high voltage power fuse, It is characterized in that The steps include: A fuse having a plurality of fuse sections connected in series is manufactured, and isolation bands are symmetrically provided on the upper surface and the lower surface of the fuse; A shell containing an inner cavity is made of an insulating substrate, the shell is "concave" shaped, two sides of the opening direction of the inner cavity are two bosses, and the shell includes an upper shell and a lower shell; An outer electrode having a first mounting hole for electrical connection with a circuit is made of a conductive metal; The two outer electrodes are fixedly connected to the bosses of the lower shell through connecting pieces respectively; The two ends of the fuse are respectively connected to the two outer electrodes, and the fuse is located at a corresponding position of the inner cavity; A plurality of the fuses connected in parallel are arranged side by side from top to bottom, and the isolation zone located on the lower surface of the upper fuse contacts the isolation zone located at a corresponding position on the upper surface of the lower fuse; The upper shell is fixedly connected to the lower shell through a connecting piece to form a main body, and the inner cavity of the upper shell is arranged opposite to the inner cavity of the lower shell to form an accommodating cavity for accommodating the fuse; A planar cover plate is made of an insulating substrate, wherein the cover plate comprises a front plate and a rear plate; The rear plate is bonded to the upper shell and the lower shell respectively by adhesive, and the rear plate forms the rear wall of the accommodating cavity; Adding filler and adhesive into the accommodating cavity to form a blank, wherein the filler is a quenching material, and the adhesive comprises a flame retardant material, a wetting agent, a bonding material and water; Heating the blank at a temperature of 80-120° C. for 60-300 minutes, wherein the filler and the adhesive are cured to form an integrated arc-extinguishing material; The front plate is bonded to the upper shell and the lower shell respectively by adhesive, and the front plate forms the front wall of the accommodating cavity and seals the accommodating cavity to manufacture the high-voltage power fuse.

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