Fuse link, fuse and electric equipment

Abstract

The invention relates to a fuse link, a fuse and electric equipment, the fuse link comprises a first sub-fuse link and a second sub-fuse link, the first sub-fuse link comprises a first narrow diameter, the second sub-fuse link comprises a second narrow diameter, and the second narrow diameter is configured to fuse before the first narrow diameter; the plurality of first sub-fuse-links are connected between terminals of the fuse, at least one first sub-fuse-link and at least one second sub-fuse-link are respectively used for being connected with the terminals, and at least one second sub-fuse-link is used for being connected with two adjacent first sub-fuse-links. The fuse link has strong current resistance performance when working normally, and has strong voltage resistance performance when a fault current passes through the fuse link.

Description

Technical Field

[0001] The present disclosure relates to the technical field of fuses, and in particular to a fuse element, a fuse and an electrical device. Background Art

[0002] In related technologies, fuses are placed inside relatively small fuse housings. The withstand voltage and current of a fuse are mutually restrictive factors. Increasing the number of fuse links improves withstand voltage, but this also increases internal resistance and power consumption, reducing current resistance. Therefore, a new structure is urgently needed to improve the withstand voltage and current resistance of fuses. Summary of the Invention

[0003] The purpose of the present disclosure is to provide a fuse, a fuse and an electrical device, wherein the fuse can withstand high voltage while ensuring strong current-carrying performance, so as to at least partially solve the related technical problems.

[0004] To achieve the above objectives, the present disclosure provides, in a first aspect, a fuse, comprising: a first sub-fuse and a second sub-fuse, wherein the first sub-fuse comprises a first narrow diameter, and the second sub-fuse comprises a second narrow diameter, wherein the second narrow diameter is configured to blow before the first narrow diameter; a plurality of the first sub-fuses are connected between terminals of a fuse, wherein at least one of the first sub-fuses and at least one of the second sub-fuses are respectively used to be connected to the terminals, and at least one of the second sub-fuses is used to connect two adjacent first sub-fuses.

[0005] Optionally, at least one of the first sub-fuse links and at least one of the second sub-fuse links are connected to the terminals on the same side.

[0006] Optionally, at least one first sub-fuse is provided between two adjacent second sub-fuse links.

[0007] Optionally, at least some of the first sub-fuses are spaced apart along a first direction and connected in series to form a fuse bank group, the two ends of the fuse bank group are respectively connected to the first sub-fuse and the second sub-fuse, and the first sub-fuses and the second sub-fuses located at the two ends of the fuse bank group are alternately arranged in a second direction.

[0008] Optionally, the plurality of first sub-fuses include at least two fuse bank groups, and the two fuse bank groups are spaced apart along the second direction and connected in series.

[0009] Optionally, the fuse includes two fuse bank groups, the proximal ends of the two fuse bank groups are connected through the first sub-fuse and the second sub-fuse, and the distal ends of the two fuse bank groups are connected to the adjacent terminals through the first sub-fuse and the second sub-fuse respectively.

[0010] Optionally, a first stress relief portion is provided at least at one end of the first sub-fuse link, and a second stress relief portion is provided at at least one end of the second sub-fuse link. The first stress relief portion is used to connect to an adjacent first sub-fuse link, and the second stress relief portion is used to connect to at least one adjacent first sub-fuse link.

[0011] Optionally, the first sub-fuse link and the second sub-fuse link are integrally provided; and / or the resistance value at the first narrow diameter is smaller than the resistance value at the second narrow diameter.

[0012] Optionally, the first sub-fuse link includes a plurality of first narrow paths, which are spaced apart along a first direction; and the second sub-fuse link includes a plurality of second narrow paths, which are spaced apart along the first direction.

[0013] Optionally, the first sub-fuse further includes a circular hole, which is located between two adjacent first narrow diameters; the second sub-fuse further includes a waist-shaped hole, which is located between two adjacent second narrow diameters.

[0014] Optionally, the ratio of the circular hole radius to the minimum width of the first narrow diameter is greater than the ratio of the radius corresponding to the arc-shaped side of the waist-shaped hole to the minimum width of the second narrow diameter.

[0015] Optionally, a distance between two adjacent first sub-fuse links in the first direction is not less than 3 mm and not more than 30 mm.

[0016] A second aspect of the present disclosure provides a fuse, comprising two terminals and the aforementioned fuse; the two terminals are respectively connected to opposite ends of the fuse.

[0017] Optionally, the fuse further comprises a shell having openings at opposite ends thereof, and an accommodation space is formed inside the shell; the fuse is located inside the accommodation space, and the ends of the two terminals away from the fuse respectively pass through the openings at opposite ends of the shell and extend outward.

[0018] Optionally, an arc extinguishing medium is provided in the accommodating space; and at least one of the terminals is formed with spaced nuts and sand filling holes, and a plug is detachably mounted on the sand filling hole.

[0019] A third aspect of the present disclosure provides an electrical device comprising the above-mentioned fuse.

[0020] Through the above technical solution, the fuse of the present disclosure includes multiple first sub-fuses and multiple second sub-fuses, the first sub-fuses include a first narrow diameter, the second sub-fuses include a second narrow diameter, and the second narrow diameter blows before the first narrow diameter. The multiple first sub-fuses are connected between the terminals of the fuse, at least one second sub-fuse is connected to the terminals, and at least one second sub-fuse is connected to two adjacent first sub-fuses. Therefore, in normal working mode, the provision of the multiple second sub-fuses can ensure strong current resistance performance. When a fault current passes through, the second sub-fuses blow first. At this time, the structure of the fuse changes, and the current can only pass through the multiple first sub-fuses, thereby improving the overall voltage resistance performance of the fuse.

[0021] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following detailed description, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings: Figure 1 is a perspective schematic diagram of an assembly of a fuse link and a terminal provided in an exemplary embodiment of the present disclosure; Figure 2 is a perspective schematic diagram of a fuse provided in an exemplary embodiment of the present disclosure; Figure 3 is a schematic front view of a fuse provided in an exemplary embodiment of the present disclosure; Figure 4 is a schematic diagram of a fuse provided in an exemplary embodiment of the present disclosure; Figure 5 is a schematic diagram of the interior of a fuse provided in an exemplary embodiment of the present disclosure.

[0023] Description of Reference Numerals 10-fuse link; 2-fuse bank group; 20-first sub-fuse link; 201-first narrow diameter; 202-round hole; 30-second sub-fuse link; 301-second narrow diameter; 302-waist-shaped hole; 40-fuse; 401-terminal; 50-first stress relief portion; 51-second stress relief portion; 60-housing; 61-accommodation space; 70-nut; 80-sand filling hole. DETAILED DESCRIPTION

[0024] The following describes the specific embodiments of the present disclosure in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure and are not intended to limit the present disclosure.

[0025] In this disclosure, unless otherwise stated, directional words such as "inside" and "outside" refer to the outline of the part itself, and "first direction" can refer to the Figure 1 In the X direction, the "second direction" can refer to Figure 1 In the middle Y direction, the “third direction” can refer to Figure 1 The Z direction in the “first center axis” can refer to Figure 3 The L line. Furthermore, it should be noted that the terms used, such as "first," "second," and the like, are intended to distinguish one element from another and do not imply order or importance. Furthermore, in the description with reference to the accompanying drawings, the same reference numerals in different drawings represent the same element.

[0026] The purpose of the present disclosure is to provide a fuse 10, a fuse and an electrical device. While ensuring strong current-carrying performance, the fuse 10 can also withstand high voltages and has strong breaking capacity, and can achieve good breaking capacity in a small volume, thereby solving related technical problems.

[0027] In order to achieve the above purpose, Figures 1 to 5 As shown, the first aspect of the present disclosure provides a fuse, comprising: a first sub-fuse 20 and a second sub-fuse 30, wherein the first sub-fuse 20 includes a first narrow diameter 201, and the second sub-fuse 30 includes a second narrow diameter 301, and the second narrow diameter 301 is configured to be fused before the first narrow diameter 201; a plurality of first sub-fuse links 20 are connected between terminals 401 of a fuse 40, at least one first sub-fuse 20 and at least one second sub-fuse 30 are respectively used to be connected to the terminals 401, and at least one second sub-fuse 30 is used to connect two adjacent first sub-fuse links 20.

[0028] According to the above technical solution, that is, the fuse 10 of the present disclosure, the fuse 10 includes a plurality of first sub-fuses 20 and a plurality of second sub-fuses 30, the first sub-fuses 20 include a first narrow diameter 201, the second sub-fuses 30 include a second narrow diameter 301, the second sub-fuses 30 can be fused first, and the first sub-fuses 20 can be fused later, and at the same time, the first sub-fuses 20 are connected between the terminals 401 of the fuse 40, the first sub-fuses 20 and the second sub-fuses 30 are respectively connected to the terminals 401, and at least one second sub-fuses 30 is connected to two adjacent terminals. The first sub-fuse links 20 are connected. Thus, in normal operating mode, current can pass through the first sub-fuse links 20 and the second sub-fuse links 30 respectively, ensuring that the fuse 40 has a strong current-carrying performance. However, when a fault current passes through, the second sub-fuse link 30 blows first. At this time, the structure of the fuse 10 changes, and the current can only pass through the path formed by the multiple first sub-fuse links 20. Due to the increase in the number of rows of first sub-fuse links 20, the overall voltage-carrying performance of the fuse 40 is improved, while the overall current-carrying performance decreases rapidly, thereby improving the breaking capacity of the fuse 40.

[0029] In some embodiments, in order to make the second narrow path 301 melt before the first narrow path 201 , the resistance value at the first narrow path 201 is smaller than the resistance value at the second narrow path 301 .

[0030] In some embodiments, in order to improve the current and voltage resistance of the fuse 10, at least one first sub-fuse 20 and at least one second sub-fuse 30 are connected to the terminals 401 on the same side. Figure 1 As shown, the terminals 401 of the fuse 40 located on the same side are respectively connected to two first sub-fuses 20 and two second sub-fuses 30, wherein the two second sub-fuses 30 are located on both sides of the two first sub-fuses 20 in the first direction. The second sub-fuses 30 and the first sub-fuses 20 are alternately spaced in the first direction. Therefore, when the fuse 40 is operating normally, the current between the terminals 401 on both sides of the fuse 40 can be transmitted through the multiple flow paths formed by the two first sub-fuses 20 and the two second sub-fuses 30, thereby improving the current-withstanding performance of the fuse 10. When a fault current passes through, the second sub-fuses 30 blow first. At this time, the current can only pass through the path formed by the multiple first sub-fuses 20. Due to the increase in the number of rows of first sub-fuses 20, the overall voltage-withstanding performance of the fuse 40 is improved.

[0031] It will be appreciated that the aforementioned structure in which the terminals 401 of the fuse 40 located on the same side are respectively connected to two first sub-fuses 20 and two second sub-fuses 30 is illustrative. In other embodiments, multiple first sub-fuses 20 and second sub-fuses 30 may be provided at the terminals 401 on both sides of the fuse 40, with the multiple first sub-fuses 20 and multiple second sub-fuses 30 spaced apart in the first direction. Of course, the terminals 401 on both sides of the fuse 40 may be respectively connected to the first sub-fuses 20 and the second sub-fuses 30, and this is not specifically limited in the present disclosure.

[0032] In order to form multiple current paths, in some embodiments, at least one first sub-fuse 20 is provided between two adjacent second sub-fuse links 30, such as Figure 1 As shown, a first sub-fuse 20 is provided between two adjacent second sub-fuse links 30. The two second sub-fuse links 30 are connected via the first sub-fuse link 20, so that during normal operation, current can pass through the circuit formed by the two second sub-fuse links 30 and the first sub-fuse link 20, thereby improving the current-carrying capacity during normal operation.

[0033] In some embodiments, at least some of the first sub-fuse links 20 are spaced apart along the first direction and connected in series to form a fuse bank 2. The two ends of the fuse bank 2 are connected to the first sub-fuse links 20 and the second sub-fuse links 30, respectively. The first sub-fuse links 20 and the second sub-fuse links 30 at the two ends of the fuse bank 2 are alternately arranged in the second direction. Figure 1 As shown, the fuse bank 2 includes three first sub-fuses 20 connected in series in a first direction. The fuse bank 2 includes two current input terminals and two current output terminals, one of which is connected to the first sub-fuse 20 and the other is connected to the second sub-fuse 30. One current output terminal is connected to the first sub-fuse 20 and the other is connected to the second sub-fuse 30. The two current input terminals and the two current output terminals are arranged crosswise in the first direction, so that the first sub-fuses 20 and the second sub-fuses 30 at the two ends of the fuse bank 2 are alternately arranged in the second direction. During normal operation, the first sub-fuses 20 and the second sub-fuses 30 form multiple flow paths through the fuse bank 2. When a fault current flows through, the second narrow paths 301 in the corresponding second sub-fuses 30 are broken, thereby allowing the multiple first sub-fuses 20 at that location to form a series circuit. Current can only flow through the multiple rows of first sub-fuses 20, thereby improving withstand voltage performance.

[0034] In some implementations, to further improve withstand voltage performance, the plurality of first sub-fuse links 20 include at least two fuse bank groups 2, which are spaced apart along the second direction and connected in series. In this manner, when a fault current passes through, the second narrow diameter 301 in the corresponding second sub-fuse link 30 ruptures. The arrangement of the plurality of fuse bank groups 2 allows for the formation of multiple rows of first sub-fuse links 20 connected in series after the second sub-fuse links 30 rupture, thereby improving withstand voltage performance.

[0035] In some embodiments, the fuse 10 includes two fuse bank groups 2. The proximal ends of the two fuse bank groups 2 are connected through the first sub-fuse 20 and the second sub-fuse 30. The distal ends of the two fuse bank groups 2 are connected to adjacent terminals 401 through the first sub-fuse 20 and the second sub-fuse 30, respectively. The proximal ends herein refer to the ends of the two fuse bank groups 2 that are close to each other, and the distal ends refer to the ends of the two fuse bank groups 2 that are close to the adjacent terminals 401. Figures 1 to 3As shown, the fuse bank group 2 includes three first sub-fuse links 20 connected in series. The fuse bank group 2 includes a first current input terminal A1, a second current input terminal A2, a first current output terminal B1, and a second current output terminal B2. The first current input terminal A1 of the fuse bank group 2 located at the top in the second direction is connected to the adjacent terminal 401 through a first sub-fuse link 20, and the second current input terminal A2 is connected to the adjacent terminal 401 through a second sub-fuse link 30. Here, the first current output terminal B1 is connected to the second current input terminal A2, and the second current output terminal B2 is connected to the first current input terminal A1. The first current output terminal B1 of the fuse bank group 2 located at the top is connected to the first current input terminal A1 located at the bottom through a first sub-fuse link 20. The second current output terminal B2 is connected to the second current input terminal A2 located below via a second sub-fuse 30. The first current output terminal B1 in the fuse bank 2 located below is connected to the adjacent terminal 401 via a first sub-fuse 20. The second current output terminal B2 in the fuse bank 2 located below is connected to the adjacent terminal 401 via a second sub-fuse 30. Therefore, during normal operation, current can flow through the multiple first sub-fuse links 20 and the multiple second sub-fuse links 30, thereby improving the current-carrying performance of the fuse 40. When a fault current flows through, the three second sub-fuse links 30 break first. At this time, the current can only flow through the nine first sub-fuse links 20 connected in series. Since the number of rows of first sub-fuse links 20 has increased to nine, the overall voltage-carrying performance of the fuse 40 is improved.

[0036] To prevent the first narrow path 201 and the second narrow path 301 from breaking due to tension, a first stress relief portion 50 is provided at at least one end of the first sub-fuse link 20, and a second stress relief portion 51 is provided at at least one end of the second sub-fuse link 30. The first stress relief portion 50 is used to connect to an adjacent first sub-fuse link 20, and the second stress relief portion 51 is used to connect to at least one adjacent first sub-fuse link 20. The first stress relief portion 50 and the second stress relief portion 51 can be constructed using any suitable structure. For example, the first stress relief portion 50 and the second stress relief portion 51 can be arc-shaped, curved in the third direction. The provision of the first stress relief portion 50 can relieve pressure on the first narrow path 201 and the second narrow path 301, preventing physical disconnection of the first narrow path 201 and the second narrow path 301. Furthermore, the first stress relief portion 50 and the second stress relief portion 51 can also have other curved structures, such as V-shaped or U-shaped structures, which are not specifically limited here.

[0037] In some implementations, to reduce the complexity of the production process, the first sub-fuse 20 and the second sub-fuse 30 are integrally integrated on a single fuse element. This replaces the separate design of the first and second sub-fuse 20, 30 in related art, which requires additional welding connections. This simplifies the process flow and reduces the difficulty of the manufacturing process. It will be appreciated that the integrated configuration of the first and second sub-fuse 20, 30 also facilitates installation between the terminals 401 of the fuse 40. For example, the withstand voltage performance can be improved by increasing the number of fuse elements 10.

[0038] In some embodiments, the fuse link 10 includes four fuse bank groups 2, arranged in pairs. Two fuse bank groups 2 are first connected in series along the second direction, and then connected in parallel along the first direction. The two fuse bank groups 2 are arranged axially symmetrically about the first symmetry axis L. Therefore, during normal operation, the first sub-fuse links 20 and the second sub-fuse links 30 form multiple flow paths through the fuse bank groups 2. When a fault current flows through, the second narrow apertures 301 in the corresponding second sub-fuse links 30 are broken, thereby forming a series circuit between the multiple first sub-fuse links 20 at that location. Current can only flow through the multiple rows of first sub-fuse links 20, thereby improving withstand voltage performance and facilitating processing of the fuse link 10.

[0039] To improve the withstand voltage performance of the fuse 10, in some embodiments, the first sub-fuse 20 includes a plurality of first narrow paths 201. The plurality of first narrow paths 201 are arranged in parallel along a first direction. That is, multiple rows of first narrow paths 201 can be arranged in the extension direction of the first sub-fuse 20, thereby improving the withstand voltage performance of the fuse 10.

[0040] Of course, in order to improve the current resistance performance of the fuse 10, in some feasible embodiments, the second sub-fuse 30 includes a plurality of second narrow diameters 301, and the plurality of second narrow diameters 301 are arranged in parallel along the first direction, that is, multiple rows of second narrow diameters 301 can be arranged in the extension direction of the second sub-fuse 30, thereby forming multiple conduction circuits for current to pass through, thereby improving the current resistance performance of the fuse 10.

[0041] In some embodiments, to facilitate forming the first narrow path 201 of the first sub-fuse 20 and the second narrow path 301 of the second sub-fuse 30 on the fuse 10, the first sub-fuse 20 may include at least two oppositely disposed first arcuate segments, with the first narrow path 201 formed between the two first arcuate segments. The first arcuate segments may be arcs, with the centers of the two arcs collinear. Thus, the first narrow path 201 is formed by the two first arcuate segments being arranged oppositely. Of course, the second sub-fuse 30 may include at least two oppositely disposed second arcuate segments, with the second narrow path 301 formed between the two second arcuate segments. The second arcuate segments may also be arcs, with the centers of the two arcs collinear. Thus, the second narrow path 301 is formed by the two second arcuate segments being arranged oppositely.

[0042] Of course, the above-described structure in which the first narrow path 201 is formed by two first arcuate segments and the second narrow path 301 is formed by two second arcuate segments is merely illustrative. In other embodiments, the first narrow path 201 and the second narrow path 301 may be formed in any other manner. For example, the first sub-fuse link 20 may further include a circular hole 202, with the first arcuate segment and the adjacent circular hole 202 forming the first narrow path 201; the second sub-fuse link 30 may further include a waist-shaped hole 302, with the second arcuate segment and the adjacent waist-shaped hole 302 forming the second narrow path 301.

[0043] In addition, there are multiple circular holes 202, which are arranged at intervals along the first direction, and a first narrow diameter 201 is formed between two adjacent circular holes 202; there are multiple waist-shaped holes 302, which are arranged at intervals along the first direction, and a second narrow diameter 301 is formed between two adjacent waist-shaped holes 302.

[0044] Optionally, the ratio between the radius of the circular hole 202 and the minimum width of the first narrow diameter 201 is greater than the ratio between the radius corresponding to the arc-shaped side of the waist-shaped hole 302 and the minimum width of the second narrow diameter 301. The larger the aperture ratio of the first narrow diameter 201 to the second narrow diameter 301, the more heat is generated per unit time. In normal working mode, although the heat generated at the second narrow diameter 301 corresponding to the waist-shaped hole 302 is large, the heat dissipation of the second narrow diameter 301 is fast due to the large spacing between the second narrow diameters 301. The heat generated at the first narrow diameter 201 corresponding to the circular hole 202 is small, but the spacing between the first narrow diameters is small, and the heat dissipation is slow. The first narrow diameter 201 and the second narrow diameter 301 both have a stable temperature rise during normal operation, which can ensure that the fuse 10 has a strong current-carrying performance. When a fault current passes through, due to the I 2The t value is small and the fuse blows first quickly. At this time, the structure of the fuse changes and the current needs to pass through multiple first sub-fuses 20 connected in series, so that the overall voltage resistance performance of the fuse 40 is automatically improved. At the same time, the overall current resistance performance decreases rapidly and the equivalent short-circuit current increases.

[0045] In order to prevent arcing between the first narrow paths 201 of two adjacent first sub-fuse links 20, the interval H between the two adjacent first sub-fuse links 20 in the first direction is not less than 3 mm.

[0046] Of course, in order to reduce the volume of the fuse 40 , in some embodiments, the distance H between two adjacent first sub-fuse links 20 in the first direction is no greater than 30 mm.

[0047] like Figure 4 and Figure 5 As shown, the second aspect of the present disclosure provides a fuse, comprising two terminals 401 and the aforementioned fuse 10; the two terminals 401 are respectively connected to opposite ends of the fuse 10. Therefore, the fuse 40 also has all the advantages of the aforementioned fuse 10.

[0048] like Figure 4 and Figure 5 As shown, in some embodiments, the fuse further includes a housing 60 having openings at opposite ends of the housing 60, forming an accommodation space 61 within the housing 60. The fuse 10 is located within the accommodation space 61, and the ends of the two terminals 401, which are remote from the fuse 10, respectively extend outward through the openings at the opposite ends of the housing 60. Optionally, there are multiple fuses 10, which are arranged at intervals along the third direction.

[0049] In order to extinguish the arc when the fusible link 10 in the fuse 40 blows, an arc extinguishing medium is optionally provided in the accommodating space 61 ; the arc extinguishing medium includes but is not limited to quartz sand, and may also be other materials capable of achieving the arc extinguishing function.

[0050] To fill the interior of the housing 60 with arc-extinguishing medium, in some embodiments, at least one terminal 401 is formed with spaced sand-filling holes 80, each with a removable plug. Once the arc-extinguishing medium is loaded into the housing 60 through the sand-filling holes 80, the plug can be used to seal the sand-filling holes 80 to prevent leakage. Furthermore, spaced nuts can be formed on the terminal 401 for electrical connection to external electrical components.

[0051] A third aspect of the present disclosure provides an electrical device including the aforementioned fuse. Therefore, the electrical device also possesses all the advantages of the aforementioned fuse. The electrical device may be a battery pack, an energy storage cabinet, a vehicle, or the like.

[0052] It should be noted that electrical equipment can also be mobile phones, portable devices, laptops, ships, spacecraft, electric toys and electric tools, etc. Vehicles can be fuel vehicles, gas vehicles or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc.; spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical equipment.

[0053] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the scope of protection of the present disclosure.

[0054] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0055] In addition, the various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A fuse, characterized in that: include: a first sub-fuse link and a second sub-fuse link, wherein the first sub-fuse link comprises a first narrow diameter, and the second sub-fuse link comprises a second narrow diameter, wherein the second narrow diameter is configured to be fused before the first narrow diameter; A plurality of the first sub-fuses are connected between terminals of the fuse, at least one of the first sub-fuses and at least one of the second sub-fuses are respectively used to connect to the terminals, and at least one of the second sub-fuses is used to connect two adjacent first sub-fuses.

2. The fuse according to claim 1, wherein At least one of the first sub-fuse links and at least one of the second sub-fuse links are connected to the terminals on the same side.

3. The fuse according to claim 1, wherein At least one first sub-fuse is disposed between two adjacent second sub-fuse links.

4. The fuse according to claim 1, wherein At least some of the first sub-fuses are spaced apart along a first direction and connected in series to form a fuse bank group. Two ends of the fuse bank group are respectively connected to the first sub-fuses and the second sub-fuses. The first sub-fuses and the second sub-fuses at two ends of the fuse bank group are alternately arranged in a second direction.

5. The fuse according to claim 4, wherein: The plurality of first sub-fuses include at least two fuse bank groups, and the two fuse bank groups are spaced apart along the second direction and connected in series.

6. The fuse according to claim 5, characterized in that The fuse includes two fuse bank groups, the proximal ends of the two fuse bank groups are connected through the first sub-fuse and the second sub-fuse, and the distal ends of the two fuse bank groups are connected to the adjacent terminals through the first sub-fuse and the second sub-fuse respectively.

7. The fuse according to claim 1, wherein: A first stress relief portion is provided at at least one end of the first sub-fuse link, and a second stress relief portion is provided at at least one end of the second sub-fuse link. The first stress relief portion is used to connect to an adjacent first sub-fuse link, and the second stress relief portion is used to connect to at least one adjacent first sub-fuse link.

8. The fuse according to claim 1, wherein: The first sub-fuse link and the second sub-fuse link are integrally provided; and / or The resistance value at the first narrow diameter is smaller than the resistance value at the second narrow diameter.

9. The fuse according to claim 1, wherein: The first sub-fuse comprises a plurality of first narrow paths, and the plurality of first narrow paths are spaced apart along a first direction; The second sub-fuse includes a plurality of second narrow paths, and the plurality of second narrow paths are spaced apart along the first direction.

10. The fuse according to claim 9, wherein: The first sub-fuse further includes a circular hole, and the circular hole is located between two adjacent first narrow diameters; The second sub-fuse further includes a waist-shaped hole, and the waist-shaped hole is located between two adjacent second narrow diameters.

11. The fuse according to claim 10, wherein: The ratio of the circular hole radius to the minimum width of the first narrow diameter is greater than the ratio of the radius corresponding to the arc-shaped side of the waist-shaped hole to the minimum width of the second narrow diameter.

12. The fuse according to claim 1, wherein A distance between two adjacent first sub-fuse links in the first direction is not less than 3 mm and not more than 30 mm.

13. A fuse, characterized in that: comprising two terminals and a fuse according to any one of claims 1 to 12; The two terminals are respectively connected to the opposite ends of the fuse.

14. The fuse according to claim 13, wherein: The fuse further includes a housing, wherein opposite ends of the housing have openings, and an accommodating space is formed in the housing; The fuse is located inside the accommodating space, and ends of the two terminals away from the fuse pass through the openings at opposite ends of the shell and extend outwards.

15. The fuse according to claim 14, wherein: The accommodating space is provided with an arc extinguishing medium; At least one of the terminals is formed with a nut and a sand filling hole that are spaced apart, and a plug is detachably mounted on the sand filling hole.

16. An electrical device, characterized in that: The invention comprises the fuse according to any one of claims 13 to 15.

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