Housing assembly, fuse, circuit system, and electric device

Abstract

A housing assembly, a fuse, a circuit system, and an electric device. The housing assembly comprises a first housing and a second housing. The first housing is snap-fitted with the second housing, the first housing and the second housing together enclose to form fixing holes, and the fixing holes are used for being snap-fitted with and fixing the connecting terminals of a fuse.

Description

Housing components, fuses, circuit systems and electrical equipment

[0001] This application claims priority to Chinese patent application No. 202420213762.9, filed on January 26, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present disclosure relates to the technical field of electrical protection elements, and in particular to a housing assembly, a fuse, a circuit system, and an electrical device. Background Art

[0003] Fuses, as protective devices against short-circuit and overload currents, are widely used in electrical equipment, particularly in high-voltage distribution systems and high-current circuits, where they are crucial for ensuring safety. When abnormal currents, such as those caused by a short circuit, flow through the circuit, the thermal effect of the energized fuse link within the fuse causes heat generation and accumulation to increase. Once the fuse reaches its limit (generally measured by its melting point), it opens, protecting all components in the circuit. Summary of the Invention

[0004] The purpose of the present disclosure is to provide a housing assembly, a fuse, a circuit system and an electrical device to solve the problems in the related art of fuses having many parts, many assembly steps and poor reliability after assembly.

[0005] To achieve the purpose of this disclosure, the present disclosure provides the following technical solutions:

[0006] In a first aspect, the present disclosure provides a housing assembly, which includes a first shell and a second shell, the first shell and the second shell are snap-connected, and the first shell and the second shell together enclose a fixing hole, which is used to snap-connect and fix the connecting terminal of the fuse.

[0007] In some embodiments, the first shell includes at least one first hook, and the second shell includes at least one first hole, and the at least one first hook is engaged with the at least one first hole.

[0008] In some embodiments, the first shell further includes a second latch hole, and the second latch hole and the first latch hook are spaced apart; the second shell further includes a second latch hook, and the second latch hook is spaced apart from the first latch hole, and the second latch hook is engaged with the second latch hole.

[0009] In some embodiments, the first hook and the second hole are arranged opposite to each other in the width direction of the first shell, and the second hook and the first hole are arranged opposite to each other in the width direction of the second shell.

[0010] In some embodiments, the shell component satisfies at least one of the following: the at least one first hook includes multiple first hooks, the at least one first hole includes multiple first holes, and the multiple first hooks and the multiple first holes are connected one-to-one; or, the at least one second hole includes multiple second holes, the at least one second hook includes multiple second hooks, and the multiple second holes and the multiple second hooks are connected one-to-one.

[0011] In some embodiments, a first bayonet is provided at at least one end of the first shell in the length direction, and a second bayonet is provided at an end of the second shell opposite to the first bayonet in the length direction, and the first bayonet and the second bayonet are connected to form the fixing hole.

[0012] In a second aspect, the present disclosure provides a fuse comprising at least one fuse element, an arc-extinguishing medium, a connecting terminal and the shell assembly described in the first aspect, wherein the shell assembly encloses a receiving cavity, the fuse element and the arc-extinguishing medium are both received in the receiving cavity, and the two opposite ends of the fuse element are respectively connected to the connecting terminals.

[0013] In some embodiments, the connecting terminal includes a first connecting platform, a column and a second connecting platform; the column is passed through the fixing hole, the first connecting platform and the second connecting platform are arranged at opposite ends of the column, and the second connecting platform is arranged in the receiving cavity.

[0014] In some embodiments, the at least one melt includes a plurality of melts, and the plurality of melts are all connected to the second connecting station.

[0015] In some embodiments, the connecting terminal is provided with a filling hole, which passes through the connecting terminal and is connected to the receiving cavity; the fuse also includes a plug, which is received in the filling hole, and the plug and the connecting terminal are detachably connected to close the filling hole.

[0016] In a third aspect, the present disclosure provides a circuit system comprising the fuse and a connecting circuit as described in the second aspect, wherein the fuse is arranged on the connecting circuit.

[0017] In a fourth aspect, the present disclosure provides an electrical device comprising the fuse described in the second aspect, or comprising the circuit system described in the third aspect.

[0018] The housing assembly provided by the present disclosure is used for a fuse. The housing assembly includes a first shell and a second shell, which are fixedly connected by clips. The connecting terminals are fixedly connected by clips through fixing holes enclosed by the first shell and the second shell. The housing assembly fully eliminates redundant parts, which can reduce the number of assembly steps. Compared with the screw connection method in the related art, the housing assembly provided by the present disclosure omits components such as bolts and baffles, and eliminates the thread fastener and baking curing steps. Compared with the riveting method in the related art, it eliminates the drilling and pinning steps. Compared with the interference fit method in the related art, it uses fewer parts and has a higher connection reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] FIG1 is an external structural diagram of a fuse according to some embodiments;

[0021] FIG2 is a diagram illustrating the internal structure of a fuse according to some embodiments;

[0022] FIG3 is a cross-sectional structural diagram of a fuse according to some embodiments;

[0023] FIG4 is an external structural diagram of a housing assembly according to some embodiments;

[0024] 5 is an exploded view of a housing assembly according to some embodiments.

[0025] Reference Signs: 100 - fuse; 10 - housing assembly, 11 - first housing, 111 - first front plate, 112 - first rear plate, 113 - first left plate, 114 - first right plate, 11A - first hook, 11B - second hook hole, 12 - second housing, 121 - second front plate, 122 - second rear plate, 123 - second left plate, 124 - second right plate, 12A - first hook hole, 12B - second hook, 13 - receiving cavity, 13A - first cavity, 13B - second cavity, 14 - fixing hole, 14A - first latch, 14B - second latch; 20 - connecting terminal, 20A - first connecting terminal, 20B - second connecting terminal, 21 - first connecting platform, 22 - column, 23 - second connecting platform, 24 - filling hole, 25 - plug; 30 - fuse, 40 - arc extinguishing medium; X-length direction, Y-width direction, Z-thickness direction. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the embodiments described are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present disclosure.

[0027] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may be an intermediate component. When a component is referred to as being "connected to" another component, it may be directly connected to the other component or there may be an intermediate component.

[0028] Unless otherwise defined, all technical and scientific terms used in this disclosure have the same meanings as those commonly understood by those skilled in the art to which this disclosure belongs. The terms used in this disclosure and in the specification are for the purpose of describing specific embodiments only and are not intended to limit this disclosure. The term "and / or" as used in this disclosure includes any and all combinations of one or more of the relevant listed items.

[0029] The following describes some embodiments of the present disclosure in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features therein may be combined with each other.

[0030] The fuses in the related art (especially the fuse shells) have many parts, which leads to more assembly steps for the fuses. The large number of parts makes the installation process cumbersome and consumes more consumable materials. In addition, the connection of multiple parts leads to weak overall strength of the fuse and poor reliability.

[0031] To address the above-mentioned issues, some embodiments of the present disclosure provide a fuse 100. Referring to Figures 1 to 3 , fuse 100 includes a housing assembly 10, connecting terminals 20, a fuse element 30, and an arc-extinguishing medium 40. Here, housing assembly 10 encloses a receiving cavity 13, and both the fuse element 30 and the arc-extinguishing medium 40 are received in the receiving cavity 13. The two opposing ends of the fuse element 30 are respectively connected to two connecting terminals 20.

[0032] In some embodiments, please refer to Figures 4 and 5. The housing assembly 10 includes a first shell 11 and a second shell 12. The first shell 11 and the second shell 12 are clamped and enclose the accommodating cavity 13. The first shell 11 and the second shell 12 are jointly enclosed to form a fixing hole 14. The fixing hole 14 is used to clamp and fix the connecting terminal 20 of the fuse 100.

[0033] In some embodiments, the first housing 11 may be in the shape of a cuboid or a semi-cylinder. The first housing 11 is formed with a first opening and a first cavity 13A. The first cavity 13A is connected to the external space through the first opening.

[0034] The second housing 12 may be in the shape of a cuboid or a semi-cylinder. The second housing 12 is formed with a second opening and a second cavity 13B. The second cavity 13B is connected to the external space through the second opening.

[0035] It can be understood that the first shell 11 and the second shell 12 are connected at the first opening and the second opening, and the first cavity 13A and the second cavity 13B are connected to form the receiving cavity 13 .

[0036] In some embodiments, after the first shell 11 and the second shell 12 are connected, they form a shell with a rectangular or cylindrical appearance. For ease of description, the following example uses the first shell 11 and the second shell 12 forming a shell with a rectangular appearance. In this case, as shown in Figure 1, the housing assembly 10 can include a length direction X, a width direction Y, and a thickness direction Z. Here, the length direction X is the direction of current flow in the fuse 100, and the thickness direction Z is the direction of relative engagement between the first shell 11 and the second shell 12.

[0037] In some embodiments, a first mating portion is provided on the first shell 11, and a second mating portion is provided on the second shell 12. The first mating portion and the second mating portion are detachably connected (such as by clamping), and the first shell 11 and the second shell 12 are clamped together by the first mating portion and the second mating portion.

[0038] In some embodiments, the form of the first mating portion and the second mating portion includes, but is not limited to: the first mating portion and the second mating portion form a snap connection or a slot connection, etc.

[0039] In some embodiments, the first mating portion and the second mating portion form a snap connection, that is, the first mating portion (or the second mating portion) can be a snap, and the second mating portion (or the first mating portion) can be a clip hole, and the two are connected and fixed by snapping the snap into the clip hole.

[0040] In other embodiments, the first mating portion and the second mating portion form a slot connection, that is, the first mating portion (or the second mating portion) can be a recessed groove, and the second mating portion (or the first mating portion) can be a protruding boss, and the two are connected and fixed by snapping the boss into the groove.

[0041] It can be understood that the first shell 11 and the second shell 12 form a mating connection through the first mating part and the second mating part, and there is no restriction on the formation of the connection. The purpose of using the mating part to form a mating connection is to improve the firmness of the connection between the first shell 11 and the second shell 12 and make the two not easy to separate.

[0042] The first shell 11 and the second shell 12 are connected to form a housing assembly 10 . The first shell 11 and the second shell 12 together enclose a fixing hole 14 to fix the connecting terminal 20 .

[0043] In some embodiments, the fixing hole 14 can be a notch provided on the first shell 11 or the second shell 12. After the first shell 11 or the second shell 12 are connected, the notch forms a circumferentially closed perforated structure, thereby forming the fixing hole 14. Alternatively, both the first shell 11 and the second shell 12 have notches, and when the two notches are aligned, they together form the at least one fixing hole 14. When the at least one fixing hole 14 includes two fixing holes 14, the two fixing holes 14 are located at opposite ends of the housing assembly 10 in the longitudinal direction X.

[0044] As shown in FIG2 , the two connection terminals 20 are a first connection terminal 20A and a second connection terminal 20B. In some embodiments, the first connection terminal 20A may be a positive connection terminal, and the second connection terminal 20B may be a negative connection terminal. The first connection terminal 20A and the second connection terminal 20B have the same structure and shape, and are hereinafter referred to as the connection terminals 20. The two connection terminals 20 are respectively connected to opposite ends of the melt 30.

[0045] In some embodiments, the first connection terminal 20A can pass through one of the two fixing holes 14, and the second connection terminal 20B can pass through the other of the two fixing holes 14. Both connection terminals 20 extend into the receiving cavity 13 and connect to the melt 30. For example, the connection terminals 20 can be made of metal.

[0046] The housing assembly 10 provided in some embodiments of the present disclosure is used for a fuse 100. The housing assembly 10 includes a first shell 11 and a second shell 12. The first shell 11 and the second shell 12 are fixed together by snapping, and the connecting terminal 20 is fixed by snapping through a fixing hole 14 enclosed by the first shell 11 and the second shell 12. The housing assembly 10 fully eliminates redundant parts and can reduce the assembly process. Compared with the screw connection method in the related art, the housing assembly 10 provided in some embodiments of the present disclosure eliminates components such as bolts and baffles, and eliminates the thread fastener and baking curing process. Compared with the riveting method in the related art, it eliminates the drilling, pinning and other processes. Compared with the interference fit method in the related art, it uses fewer parts and has higher connection reliability.

[0047] In some embodiments, the first and second shells 11, 12 can be made of a nylon-based composite material. This material has a high melting point and a certain degree of toughness. Under heat or the pressure of an internal high-pressure arc, it tightens, achieving a connection strength even higher than during assembly, preventing separation or cracking. Furthermore, flame retardants can be added to the first and second shells 11, 12 to effectively prevent the fuse 100 from overheating, burn-through, and leakage of the filling medium.

[0048] In some embodiments, referring to FIG. 4 and FIG. 5 , the first housing 11 includes at least one first hook 11A, and the second housing 12 includes at least one first hole 12A. The at least one first hook 11A is engaged with the at least one first hole 12A.

[0049] In some embodiments, the first shell 11 includes a first shell body and a first mating portion, the first mating portion includes at least one first clip, the first shell body is formed with a first opening and a first cavity 13A, at least one first clip is arranged on the end face of the first opening, and at least one first clip extends along the thickness direction Z.

[0050] The second housing 12 includes a second housing body and a second mating portion. The second mating portion includes at least one first latching hole 12A. The second housing body is formed with a second opening and a second cavity 13B. The at least one first latching hole 12A is provided on the wall of the second housing body. When the first housing 11 and the second housing 12 are connected, the at least one first latching hook 11A engages with the at least one first latching hole 12A.

[0051] In some embodiments, the first housing includes a first front plate 111 and a first rear plate 112 that are opposed to each other in the width direction Y, and the first hook 11A can be disposed on at least one of the first front plate 111 or the first rear plate 112. That is, the at least one first hook 11A can include a single first hook 11A, disposed on either the first front plate 111 or the first rear plate 112; or the at least one second hook 12B can include a plurality of second hooks 12B, with at least one first hook 11A disposed on each of the first front plate 111 and the first rear plate 112.

[0052] In some embodiments, the second housing body includes a second front plate 121 and a second rear plate 122 that are opposite to each other in the width direction Y. The second front plate 121 is connected to the first front plate 111, and the second rear plate 122 is connected to the first rear plate 112. The first latch hole 12A can be provided on at least one of the second front plate 121 or the second rear plate 122, and the first latch hole 12A can pass through the plate body.

[0053] It is understandable that the number of the first engaging holes 12A and the number of the first engaging hooks 11A may be the same, so the number and positions of the first engaging holes 12A may be determined based on the first engaging hooks 11A, which will not be elaborated here.

[0054] For example, the at least one first hook 11A may include four first hooks 11A, and the at least one first hole 12A may include four first holes 12A. In this case, two first hooks 11A are provided on each of the first front plate 111 and the first rear plate 112, and two second holes 11B are provided on each of the second front plate 121 and the second rear plate 122. Thus, after the first shell 11 and the second shell 12 are connected, the four first hooks 11A are all engaged with the corresponding first holes 12A.

[0055] The snap-fit ​​connection and fixing method can save the manufacturing cost of the housing assembly 10 and reduce the use of redundant parts, thereby reducing the assembly process.

[0056] In some embodiments, referring to Figures 4 and 5 , the first housing 11 further includes a second latch hole 11B spaced apart from the first latch hook 11A. The second housing 12 further includes a second latch hook 12B spaced apart from the first latch hole 12A, and the second latch hook 12B engages with the second latch hole 11B.

[0057] In some embodiments, the first mating portion further includes at least one second latch hole 11B, which can be provided on at least one of the first front plate 111 or the first rear plate 112 and can extend through the plate. The second mating portion further includes at least one second hook 12B, which can be provided on at least one of the second front plate 121 or the second rear plate 122. The shape and structure of the second hook 12B can be identical to that of the first hook 11A and are not described in detail here.

[0058] It can be understood that in some embodiments of the present disclosure, the first mating portion and the second mating portion each include two parts, namely a hook and a hole. Here, the first mating portion includes a first hook 11A and a second hole 11B, and the second mating portion includes a first hole 12A and a second hook 12B.

[0059] Thus, by providing hooks and holes on both the first and second shells 11, 12, they can be interlocked, thereby strengthening the connection between them. Furthermore, when the fuse 100 is subjected to an expansion force from the inside out, the interlocking buckle structure can be tightened, thereby resisting the pressure of the internal high-temperature arc on the plastic wall and preventing it from exploding. Furthermore, the first and second shells 11, 12 can be of the same structure, meaning that they can be produced using a single mold, reducing manufacturing costs.

[0060] In some embodiments, the effective engagement distance between the hook (including the first hook 11A and the second hook 12B) and the hole (including the first hole 12A and the second hole 11B) is approximately 2 mm to 3 mm.

[0061] In some embodiments, referring to FIG. 4 and FIG. 5 , the first hook 11A and the second hole 11B are disposed opposite to each other in the width direction Y of the first shell 11 , and the second hook 12B and the first hole 12A are disposed opposite to each other in the width direction Y of the second shell 12 .

[0062] In some embodiments, on the first housing 11, the first mating portion may be arranged in a manner such that the first hook 11A is on one side of the first housing 11, and the second latch hole 11B is on the other side of the first housing 11. Here, the first hook 11A may be arranged on the first front panel 111, and the second latch hole 11B may be arranged on the first rear panel 112. Then, on the second housing 12, the second mating portion may be arranged in a manner such that the second hook 12B is on one side of the second housing 12, and the first latch hole 12A is on the other side of the second housing 12. Here, the first latch hole 12A may be arranged on the second front panel 121, and the second hook 12B may be arranged on the second rear panel 122.

[0063] In this way, by setting the first shell 11 and the second shell 12 to have the same structure, and the hook and the hole are located on different sides of the first shell 11 or the second shell 12, the first shell 11 and the second shell 12 can be interlocked, thereby increasing the connection strength of the first shell 11 and the second shell 12.

[0064] In some embodiments, the first hook 11A and the second hole 11B are spaced apart from each other in the longitudinal direction X (not shown in the figure), and the second hook 12B and the first hole 12A are spaced apart from each other in the longitudinal direction X.

[0065] In some embodiments, on the first housing 11, the first mating portion can be arranged such that the first hook 11A and the second hole 11B are on the same side. Here, the first hook 11A can be arranged on the first front plate 111, and the second hole 11B can be arranged on the first front plate 111, with a gap between the first hook 11A and the second hole 11B. Then, on the second housing 12, the second mating portion can be arranged such that the second hook 12B and the first hole 12A are on the same side. Here, the first hole 12A can be arranged on the second front plate 121, and the second hook 12B can be arranged on the second front plate 121, with a gap between the first hook 11A and the second hole 11B.

[0066] In some embodiments, referring to Figures 4 and 5, the housing assembly 10 satisfies at least one of the following: at least one first hook 11A includes multiple first hooks 11A, at least one first hole 12A includes multiple first holes 12A, and the multiple first hooks 11A and the multiple first holes 12A are connected one-to-one; or, at least one second hole 11B includes multiple second holes 11B, at least one second hook 12B includes multiple second hooks 12B, and the multiple second holes 11B and the multiple second hooks 12B are connected one-to-one.

[0067] In some embodiments, based on the above embodiments, in embodiments where the first hook 11A is on one side and the second latch hole 11B is on one side, multiple first hooks 11A are distributed on one side, and the second latch holes 11B are also distributed on one side. For example, at least one first hook 11A includes two first hooks 11A, and at least one first latch hole 12A includes two first latch holes 12A. That is, the first front plate 111 is provided with two first hooks 11A, and the first rear plate 112 is provided with two second latch holes 11B. Of course, the configuration of the second mating portion on the second housing 12 is similar to that of the first mating portion and will not be further described here.

[0068] In some embodiments, based on the above embodiments, in which the first hook 11A and the second latch hole 11B are on the same side, the plurality of first hooks 11A and the plurality of second latch holes 11B are evenly distributed on both sides. For example, the at least one first hook 11A includes two first hooks 11A, and the at least one first latch hole 12A includes two first latch holes 12A. That is, the first front plate 111 is provided with one first hook 11A and one second latch hole 11B, and the first rear plate 112 is provided with one first hook 11A and one second latch hole 11B. Of course, the configuration of the second mating portion on the second housing 12 is similar to that of the first mating portion and will not be further described here.

[0069] In some embodiments, please refer to Figures 4 and 5, the first shell 11 is provided with a first bayonet 14A at at least one end in the length direction X, and the second shell 12 is provided with a second bayonet 14B at the end opposite to the first bayonet 14A in the length direction X. The first bayonet 14A and the second bayonet 14B are connected to form a fixing hole 14.

[0070] In some embodiments, the first housing 11 is provided with a first latch 14A at opposite ends in the longitudinal direction X. That is, two first latches 14A are provided on the first housing 11, and the two first latches 14A are located at the two ends of the first housing 11. The first housing 11 is provided with a first left plate 113 and a first right plate 114 that are disposed opposite each other in the longitudinal direction X. The first left plate 113 and the first right plate 114 are each provided with a first latch 14A on one side of the first opening. That is, the first latch 14A is formed on the end surfaces of the first left plate 113 and the first right plate 114 and extends along the thickness direction Z. In this case, before the first housing 11 and the second housing 12 are connected, the first latch 14A forms a circumferentially connected slot-like structure.

[0071] It can be understood that the second shell 12 is provided with a second left plate 123 and a second right plate 124 that are relatively arranged in the length direction X. After the first shell 11 and the second shell 12 are connected, the first left plate 113 and the second left plate 123 are docked, and the first right plate 114 and the second right plate 124 are docked, so that the first bayonet 14A forms a circumferentially closed perforated structure.

[0072] Based on the above embodiment, the second housing 12 is provided with second bayonet holes 14B at opposite ends in the longitudinal direction X. That is, two second bayonet holes 14B are provided on the second housing 12, and the two second bayonet holes 14B are located at each end of the second housing 12. The second housing 12 is provided with a second left plate 123 and a second right plate 124, which are arranged opposite each other in the longitudinal direction X. The second left plate 123 and the second right plate 124 are each provided with a second bayonet hole 14B on one side of the second opening. That is, the second bayonet hole 14B is formed on the end surfaces of the second left plate 123 and the second right plate 124 and extends along the thickness direction Z. In this case, before the first housing 11 and the second housing 12 are connected, the second bayonet holes 14B form a circumferentially connected bayonet groove structure.

[0073] It can be understood that the second shell 12 is provided with a second left plate 123 and a second right plate 124 that are relatively arranged in the length direction X. After the first shell 11 and the second shell 12 are connected, the first left plate 113 and the second left plate 123 are docked, and the first right plate 114 and the second right plate 124 are docked, so that the first bayonet 14A and the second bayonet 14B form a circumferentially closed perforated structure, which is the fixing hole 14.

[0074] In some embodiments, please refer to Figure 2, the connecting terminal 20 includes a first connecting platform 21, a column 22 and a second connecting platform 23; the column 22 is passed through the fixing hole 14, the first connecting platform 21 and the second connecting platform 23 are arranged at opposite ends of the column 22, and the second connecting platform 23 is arranged in the receiving cavity 13.

[0075] In some embodiments, the connector 20 comprises three parts: a first connection platform 21, a column 22, and a second connection platform 23, all of which are integrally formed. The column 22 is connected to the first connection platform 21 and the second connection platform 23 at opposite ends along the longitudinal direction X. The column 22 is configured to pass through the fixing hole 14; the first connection platform 21 is located outside the receiving cavity 13 and is used to connect to other conductive circuits; the second connection platform 23 is located within the receiving cavity 13 and is used to connect to the melt 30.

[0076] In some embodiments, the cross-section of the column 22 can be a quadrilateral, and the outline of the fixing hole 14 can also be a quadrilateral. It is understood that the first bayonet 14A and the second bayonet 14B described above are both engaged with the column 22, thereby connecting and fixing the connecting terminal 20 to the first shell 11 and the second shell 12.

[0077] In some embodiments, the cross-sectional shape of the first connecting platform 21 and the second connecting platform 23 are both quadrilateral, and the cross-sectional area of ​​the first connecting platform 21 and the second connecting platform 23 is larger than the cross-sectional area of ​​the column 22. The cross-sectional area of ​​the first connecting platform 21 and the second connecting platform 23 is also larger than the area of ​​the fixing hole 14. In this way, after the connecting terminal 20 is connected to the first shell 11 and the second shell 12, the connecting terminal 20 is restrained by the first connecting platform 21 and the second connecting platform 23 and will not slide along the length direction X and fall out of the shell.

[0078] In some embodiments, the cross-sectional area of ​​the first connecting platform 21 is smaller than the cross-sectional area of ​​the second connecting platform 23. Since the fuse 100 may include at least one melt 30, and at least one melt 30 is disposed in the receiving cavity 13, the cross-sectional area of ​​the second connecting platform 23 may be larger, thereby connecting more melts 30.

[0079] In some embodiments, when at least one melt chamber can include multiple melts 30, all of the multiple melts 30 are connected to the second connection platform 23. For example, the multiple melts 30 are arranged sequentially and spaced apart in the receiving cavity, and the space between two adjacent melts 30 can be filled with arc-extinguishing medium 40. In addition, the opposing ends of the multiple melts 30 are connected to two opposing second connection platforms 23. Due to the larger area of ​​the second connection platform 23, more melts 30 can be connected.

[0080] In some embodiments, referring to FIG2 , the connection terminal 20 is provided with a filling hole 24 that passes through the connection terminal 20 and communicates with the receiving cavity 13. The fuse 100 further includes a plug 25 received in the filling hole 24. The plug 25 and the connection terminal 20 are detachably connected to each other to open or close the filling hole 24.

[0081] In some embodiments, the connection terminal 20 is provided with a filling hole 24. The filling hole 24 extends through the connection terminal 20 along the length direction X. Specifically, the filling hole 24 sequentially extends through the first connection platform 21, the column 22, and the second connection platform 23, and communicates with the external receiving cavity 13. The filling hole 24 can be used to inject the arc-extinguishing medium 40. The plug 25 is used to seal the filling hole 24 and can be used to seal the filling hole 24 after the arc-extinguishing medium 40 is injected.

[0082] In some embodiments, the installation method of the fuse 100 may include: electrically connecting the fuse element 30 to the connecting terminal 20 by means of resistance welding or the like, placing the connected fuse element 30 and the connecting terminal 20 into the first housing 11 (or the second housing 12), and then installing the second housing 12 (or the first housing 11). The first housing 11 and the second housing 12 are interlocked by a first mating portion and a second mating portion. The first mating portion and the second mating portion may be configured as a hook and a hole. During the assembly process, the connected fuse element 30 and the connecting terminal 20 are fixed by a jig to prevent the fuse element 30 from being damaged by external forces.

[0083] After assembly, the first housing 11 and the second housing 12 enclose the receiving chamber 13, which contains the melt 30. The filling hole 24 is located in the center of the connecting terminal 20, and the arc-extinguishing medium 40 enters the receiving chamber 13 through the filling hole 24 until the arc-extinguishing medium 40 is completely filled and then sealed by the plug 25.

[0084] The two shells of the fuse 100 provided in some embodiments of the present disclosure can be interlocked and connected through a snap-fit ​​structure. The snap-fit ​​structure can adopt a dead buckle with high structural strength and not easy to disassemble, or a strong release buckle with resistance to falling. When the fuse 100 is subjected to an expansion force expanding from the inside to the outside, the snap-fit ​​structure can be pulled tighter and tighter due to the interlocking, thereby resisting the pressure of the internal high-temperature gas arc on the plastic wall and preventing it from exploding. At the same time, flame retardant materials are added to the first shell 11 and the second shell 12, which can effectively prevent the fuse 100 from overheating, burning through, and leakage of the filling medium. The melt 30 is made of a metal material with good electrical and thermal conductivity. When connected in the circuit, the working principle is the same as other fuses 100, relying on the thermal effect of the current to achieve current limiting and protect the circuit safety.

[0085] In summary, compared with related technologies, some embodiments of the present disclosure have the advantages of green production, energy saving and environmental protection, using fewer parts to ensure that the two shells of the fuse 100 are reliably connected and greatly simplifying the process.

[0086] In some embodiments, some embodiments of the present disclosure further provide a circuit system, including a fuse 100 and a connecting circuit, wherein the fuse 100 is disposed on the connecting circuit.

[0087] In some embodiments, some embodiments of the present disclosure further provide an electrical device including the fuse 100 or the circuit system described above. The electrical device may be a terminal device such as a battery pack, a new energy vehicle, or an energy storage cabinet.

[0088] In the description of some embodiments of the present disclosure, it should be noted that the orientation or positional relationship of terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" are based on the orientation or positional relationship of the accompanying drawings, which is only for the convenience of describing the present disclosure and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0089] The above disclosure is only a preferred embodiment of the present disclosure, and it is certainly not intended to limit the scope of the rights of the present disclosure. A person skilled in the art can understand that all or part of the processes of the above embodiment and equivalent changes made in accordance with the claims of the present disclosure are still within the scope of the present disclosure.

Claims

1. An outer shell component for a fuse, wherein, The housing assembly includes a first housing and a second housing. The first housing and the second housing are snap-connected. The first housing and the second housing jointly enclose a fixing hole for snap-connecting and fixing the connection terminals of the fuse.

2. The housing assembly according to claim 1, wherein, The first housing includes at least one first hook, and the second housing includes at least one first hole. The at least one first hook is snapped into the at least one first hole.

3. The housing assembly according to claim 2, wherein, The first housing further includes a second hole spaced from the first hook. The second housing further includes a second hook spaced from the first hole. The second hook is snapped into the second hole.

4. The housing assembly according to claim 3, wherein, The first hook and the second hole are oppositely arranged in the width direction of the first housing, and the second hook and the first hole are oppositely arranged in the width direction of the second housing.

5. The housing assembly according to claim 3 satisfies at least one of the following: the at least one first hook includes a plurality of first hooks, the at least one first hole includes a plurality of first holes, and the plurality of first hooks and the plurality of first holes are connected in one-to-one correspondence; or, the at least one second hole includes a plurality of second holes, the at least one second hook includes a plurality of second hooks, and the plurality of second holes and the plurality of second hooks are connected in one-to-one correspondence.

6. The housing assembly according to any one of claims 1-5, wherein, At least one end of the first housing in the length direction is provided with a first bayonet, and one end of the second housing in the length direction opposite to the first bayonet is provided with a second bayonet. The first bayonet and the second bayonet communicate with each other to form the fixing hole.

7. A fuse includes at least one fuse element, an arc extinguishing medium, connection terminals, and the housing assembly according to any one of claims 1-6. The housing assembly encloses a receiving cavity. The fuse element and the arc extinguishing medium are both received in the receiving cavity. Opposite ends of the fuse element are respectively connected to the connection terminals.

8. The fuse according to claim 7, wherein, The connection terminal includes a first connection platform, a column body, and a second connection platform. The column body passes through the fixing hole. The first connection platform and the second connection platform are arranged at opposite ends of the column body. The second connection platform is arranged in the receiving cavity.

9. The fuse according to claim 8, wherein, The at least one fuse element includes a plurality of fuse elements, and the plurality of fuse elements are all connected to the second connection platform.

10. The fuse according to claim 7 or 8, wherein, The connection terminal is provided with a filling hole that penetrates the connection terminal and communicates with the receiving cavity. The fuse further includes a plug. The plug is received in the filling hole. The plug and the connection terminal are detachably connected to close the filling hole.

11. A circuit system includes the fuse according to any one of claims 7-10 and a connection circuit. The fuse is arranged on the connection circuit.

12. An electrical device includes the fuse according to any one of claims 7-10, or includes the circuit system according to claim 11.

Images