Fuses with improved mechanical strength and fuses having the same

Abstract

The utility model relates to a melt for having the mechanical strength of improvement and the fuse with the melt, the melt includes: support base plate, it includes the support plate made of nonmetal insulating material and at least covers the adhesive layer of one long width surface of the support plate, the fusible element is configured as the sheet structure made of the conductive metal material and is fixedly arranged on one long width surface of the support plate through the adhesive layer, wherein both ends in the width direction of the fusible element are arranged to not exceed both ends in the width direction of the support plate, both ends in the length direction of the fusible element are arranged to extend respectively beyond both ends in the length direction of the support plate, and the thickness dimension of the fusible element is less than the thickness dimension of the support plate. The melt provided by the utility model can be used for breaking overload current while having sufficient mechanical strength, thereby improving applicability and reliability.

Description

Technical Field

[0001] This utility model relates to the field of circuit protection device technology, and in particular to a fusible element with improved mechanical strength and a fuse having the fusible element. Background Technology

[0002] With the acceleration of the global energy transition, industries such as energy storage systems and electric vehicles in the field of new energy technology have developed rapidly. The importance of fuses for overload and short-circuit protection has become increasingly prominent. Conventional fuses are typically used to interrupt large-scale short-circuit currents in relatively stable installation environments. However, equipment in the new energy technology field needs to withstand mechanical shocks and vibrations for extended periods and frequently experiences small-scale overload faults. This leads to a risk of delayed protection or failure of conventional fuses when applied to new energy equipment, which in turn affects the safe and reliable operation of the equipment.

[0003] To improve the overload protection sensitivity of conventional fuses, existing technologies attempt to reduce the rated current of the fuse element by decreasing its cross-sectional area. However, this also reduces the mechanical strength of the fuse element, which obviously makes it easy for the fuse element to be damaged or even broken during both the manufacturing process and normal use. This would greatly reduce the reliability and safety of the fuse.

[0004] Therefore, there is a demand in this field for fuses with strong breaking capacity and mechanical strength, as well as wide applicability. Utility Model Content

[0005] The present invention aims to provide a melt with improved mechanical strength that can at least solve some of the above-mentioned problems.

[0006] This invention also aims to provide a fuse that utilizes the above-described improved fusible element.

[0007] According to one aspect of the present invention, a melt with improved mechanical strength is provided, the melt comprising: a support substrate including a support plate made of a non-metallic insulating material and an adhesive layer covering at least one of the long and wide surfaces of the support plate; a fusible element configured as a sheet structure made of a conductive metallic material and fixedly disposed on one of the long and wide surfaces of the support plate via the adhesive layer, wherein the two ends of the fusible element in the width direction are arranged not to extend beyond the two ends of the support plate in the width direction, the two ends of the fusible element in the length direction are arranged to extend beyond the two ends of the support plate in the length direction, and the thickness dimension of the fusible element is smaller than the thickness dimension of the support plate.

[0008] Compared with the prior art, the fusible element provided by this utility model provides the function of interrupting overload current by a fusible element made of metallic conductive material, and supports the fusible element by a support plate made of non-metallic insulating material with a larger thickness and covering the fusible element in both the length and width directions, which is fixedly connected to the fusible element in the thickness direction via an adhesive layer. This improves the mechanical strength of the fusible element and avoids damage due to accidental stress during assembly and normal use. The safety and reliability of the applied fuse are also improved.

[0009] Preferably, the centerline of the fusible element along its length is aligned with the centerline of the support plate along its length.

[0010] Preferably, the two ends of the support plate in the width direction extend beyond the two ends of the fusible element in the width direction.

[0011] Preferably, the fusible element includes a fusible section along its length and a pair of mounting sections arranged at both ends of the fusible section along its length, the two ends of the fusible section along its length being aligned with the two ends of the support plate along its length.

[0012] Preferably, each mounting section includes a support section adjacent to the fusible section and a connecting section bent relative to the support section in a direction away from the support plate.

[0013] Preferably, the fusible section includes a plurality of spaced-apart narrow sections along its length.

[0014] According to another aspect of the present invention, a fuse is also provided, the fuse comprising the aforementioned molten element having improved mechanical strength.

[0015] Preferably, the fuse further includes a fuse tube for receiving the molten material, a pair of terminals respectively installed at both ends of the fuse tube to connect to both ends of the molten material, and an arc-extinguishing medium filled inside the fuse tube to cover the molten material.

[0016] Preferably, each terminal includes an inner cap that is connected to the fusible tube in an interference fit and to the corresponding end of the fusible element, and an outer cap that is connected to the inner cap in an interference fit and to an external circuit.

[0017] Preferably, the inner cap of each terminal block is provided with a through hole that allows the corresponding mounting section of the molten metal to pass through, so that the connection section of the corresponding mounting section of the molten metal can be attached to the inner cap away from the surface of the molten tube and connected thereto.

[0018] Other features and advantages of this invention will partly be apparent to those skilled in the art upon reading this application, and partly will be described below in conjunction with the accompanying drawings in the detailed description. Attached Figure Description

[0019] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings, wherein:

[0020] Figure 1 This is a cross-sectional view of a fuse according to an embodiment of the present invention;

[0021] Figure 2 This is a front view of the fusible element of a fuse according to an embodiment of the present invention;

[0022] Figure 3 This is a bottom view of the fuse element of a fuse according to an embodiment of the present invention.

[0023] Explanation of reference numerals in the attached drawings: 100-fuse; 10-fusible element; 11-support base plate; 111-support plate; 12-fusible element; 121-fusible section; 121a-neck section; 122-mounting section; 122a-support section; 122b-connection section; 20-fusible tube; 30-arc extinguishing medium; 40-terminal; 41-inner cap; 42-outer cap. Detailed Implementation

[0024] The schematic scheme of the fuse and its fusible element disclosed in this utility model is now described in detail with reference to the accompanying drawings. Although the drawings are provided to illustrate some embodiments of this utility model, the drawings are not necessarily drawn to the dimensions of the specific embodiments, and certain features may be enlarged, removed, or partially cut to better illustrate and explain the disclosure of this utility model. Some components in the drawings may be repositioned according to actual needs without affecting the technical effect. The phrase "in the drawings" or similar terms appearing in the specification do not necessarily refer to all drawings or examples.

[0025] Certain directional terms used in the description of the accompanying drawings below, such as “inner,” “outer,” “above,” “below,” and other directional terms, will be understood to have their normal meaning and refer to those directions as normally viewed in the accompanying drawings. Unless otherwise specified, the directional terms used in this specification are generally in accordance with the conventional directions understood by those skilled in the art.

[0026] The terms “first,” “first,” “second,” “second,” and similar terms used in this utility model do not indicate any order, quantity, or importance, but are used to distinguish one component from other components.

[0027] The terms "joining", "connection" and similar terms used in this utility model include both indirect connection of two components with the aid of an intermediate layer such as an adhesive or welding agent or an intermediate component such as a connector or transition piece, and direct connection of two components without the aid of any intermediate layer such as an adhesive or welding agent or an intermediate component such as a connector or transition piece.

[0028] Figures 1 to 3 The present invention's fuse 100 is illustrated by way of example. It exhibits good performance in interrupting small-multiple overload currents and possesses high mechanical strength, thereby improving its applicability, reliability, and service life. It should be noted that the "length direction of the support plate 111" and the "length direction of the fusible element 12" mentioned herein refer to the left-right directions shown in the accompanying drawings, and the "width direction of the support plate 111" and the "width direction of the fusible element 12" are also referenced in the accompanying drawings. Figure 1 and 2 Page inward and outward orientation and attachments Figure 3 The vertical direction, as well as the thickness direction of the support plate 111 and the thickness direction of the fusible element 12, are attached. Figure 1 and 2 The up and down directions in the middle.

[0029] As shown in the figure, the fuse 100 may include a fusible element 10, a fuse tube 20, an arc-extinguishing medium 30, and a pair of terminals 40. The fuse tube 20 may be designed as a cylindrical structure with an internal mounting cavity, extending along the length of the fusible element 10 to house it within the mounting cavity. The pair of terminals 40 are respectively mounted to both axial ends of the fuse tube 20 and connected to both ends along the length of the fusible element 10, thereby connecting the fusible element 10 in series with an external circuit while enclosing it within the mounting cavity of the fuse tube 20, thus providing short-circuit and overload protection for the external circuit. The arc-extinguishing medium 30, such as silica sand, may fill the mounting cavity inside the fuse tube 20 to cover the fusible element 10 within the fuse tube 20, thereby assisting in arc extinguishing when the fusible element 10 melts due to a fault current.

[0030] Combination Figure 2 and Figure 3 As shown, the melt 10 may include a support substrate 11 and a fusible element 12.

[0031] Specifically, the support substrate 11 may include a support plate 111 made of a non-metallic insulating material and an adhesive layer covering at least one of the long and wide planes of the support plate 111, such as the lower long and wide plane shown in the figure. Exemplarily, the support plate 111 may be made of materials such as fiberglass board or nylon, which are lightweight, have excellent insulation properties, and sufficient mechanical strength. The support plate 111 may then be impregnated with an adhesive, such as a solution containing epoxy resin, so that the periphery of the support plate 111 is covered with adhesive material. After the adhesive material has partially cured, fusible elements 12 may be stacked on the lower long and wide plane of the support plate 111 and laminated, so that the fusible elements 12 can be fixedly arranged on the lower long and wide plane of the support plate 111 via the adhesive layer after the adhesive material has cured to form the adhesive layer. The adhesive layer can be used to fix and connect structures made of different materials, especially non-metallic and metallic materials.

[0032] The fusible element 12 can be designed as a sheet structure made of a conductive metal material such as silver or copper, extending in the same orientation as the support plate 111. That is, the length direction of the fusible element 12 is the same as the length direction of the support plate 111, the width direction of the fusible element 12 is the same as the width direction of the support plate 111, and the thickness direction of the fusible element 12 is the same as the thickness direction of the support plate 111. This allows the long and wide surfaces of the fusible element 12 to abut against the long and wide surfaces of the support plate 111, so that the contact area between the fusible element 12 and the support plate 111 is as large as possible. The fusible element 12 also has the largest possible contact area with the adhesive layer. Therefore, the fusible element 12 can be reliably fixed to the support plate 111 via the adhesive layer.

[0033] Importantly, the two ends of the support plate 111 in the width direction extend away from each other to be aligned with at least the two ends of the fusible element 12 in the width direction. Preferably, as shown, the two ends of the support plate 111 in the width direction are arranged to extend beyond the two ends of the fusible element 12 in the width direction, so that the support plate 111 can fully support the fusible element 12 in the width direction. The two ends of the support plate 111 in the length direction are arranged to extend beyond the two ends of the support plate 111 in the length direction, so that they can be connected in series to an external circuit. The thickness of the support plate 111 is greater than the thickness of the fusible element 12, so as to provide improved mechanical strength for the fusible element 12. Thus, the fusible element 10 provided by this invention can improve the mechanical strength of the fusible element 12 by providing it with the support plate 111 when the fusible element 12 is designed to be smaller in size to interrupt overload fault current. This can prevent the fusible element 10 from being accidentally damaged by pulling during assembly and prevent the fusible element 12 from being accidentally broken by mechanical impact and vibration during use.

[0034] In an embodiment not shown, the fusible element 12 may be designed as a fusible body and an auxiliary part integrally formed. Similar to what was described above, the fusible body and the auxiliary part may be stacked on the support plate 111 when the adhesive material is semi-cured, and fixedly connected to the lower long and wide plane of the support plate 111 via the adhesive layer after the adhesive material is cured. Subsequently, the auxiliary part may be decoupled from the fusible body, the support plate 111 and the adhesive layer by means of chemical etching or the like, thereby retaining the fusible body fixed to the support plate 111 via the adhesive layer to provide fusing protection.

[0035] Optionally, in the illustrated embodiment, the center line of the fusible element 12 along the length direction is aligned with the center line of the support plate 111 along the length direction, which allows the fusible element 12 to be centered relative to the support plate 111 in the width direction and its two ends in the width direction to have equal spacing with the two ends in the width direction of the support plate 111.

[0036] Optionally, in the illustrated embodiment, the fusible element 12 may be divided along its length into a fusible section 121 and a pair of mounting sections 122 located at both ends of the fusible section 121 along its length. The fusible section 121 may be arranged relative to the support plate 111, with its two ends aligned with the two ends of the support plate 111 along its length. The mounting sections 122 extend from the fusible section 121 beyond the support plate 111 to connect with the corresponding terminals 40.

[0037] Optionally, in the illustrated embodiment, the mounting section 122 may include a support section 122a and a connecting section 122b. The support section 122a extends from the fusible section 121 and is arranged coplanarly with the lower length and width surfaces of the fusible section 121. The connecting section 122b may be bent relative to the support section 122a, for example, as shown in the figure, it is arranged perpendicular to the support section 122a and cooperates with the support section 122a to form an L-shaped structure.

[0038] Furthermore, the terminal block 40 may include an inner cap 41 and an outer cap 42. The inner cap 41 is installed with an interference fit to the corresponding axial end of the fuse tube 20 to close the fuse tube 20. The outer cap 42 may also be installed with an interference fit to the inner cap 41 and connected to an external circuit, which greatly simplifies the assembly steps of the fuse 100. Thus, the support section 122a of the fusible element 12 can extend through the through hole of the inner cap 41 to be aligned with the surface of the inner cap 41 facing away from the fuse tube 20. The connecting section 122b, which is bent perpendicularly relative to the support section 122a in a direction away from the support plate 111, can therefore be arranged against the surface of the inner cap 41 facing away from the fuse tube 20 and can be connected to the inner cap 41 by welding methods such as resistance welding or laser welding. The outer cap 42 is then installed to the inner cap 41 to clamp the corresponding connecting section 122b between the outer cap 42 and the inner cap 41, thereby connecting the connecting section 122b to an external circuit.

[0039] The support section 122a extending beyond the support plate 111 can be further supported by the hole wall of the through hole of the inner cap 41, and the connecting section 122b extending in a direction away from the support plate 111 can prevent the end side of the support plate 111 in the length direction from causing accidental damage to the support section 122a during the bending step.

[0040] Optionally, in the illustrated embodiment, the fusible segment 121 of the fusible element 12 may include a plurality of narrow neck segments 121a that are spaced apart, preferably evenly spaced, along the length direction. The shape, minimum cross-sectional dimension, and total cross-sectional dimension of the plurality of narrow neck segments 121a are also designed to be identical, as shown in the figure. In embodiments not shown, the shape, minimum cross-sectional dimension, and total cross-sectional dimension of the plurality of narrow neck segments 121a may also be designed to be not entirely identical, and can be selected according to actual needs.

[0041] It should be understood that although this specification describes various embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0042] The above description is merely an illustrative embodiment of this utility model and is not intended to limit the scope of this utility model. Any equivalent changes, modifications, and combinations made by those skilled in the art without departing from the concept and principles of this utility model should fall within the protection scope of this utility model.

Claims

1. A melt (10) with improved mechanical strength, characterized in that, The melt (10) comprises: A support substrate (11) includes a support plate (111) made of a non-metallic insulating material and an adhesive layer covering at least one of the long and wide surfaces of the support plate (111). A fusible element (12) is constructed as a sheet structure made of conductive metal material and is fixedly disposed on one of the long and wide surfaces of the support plate (111) via the adhesive layer. The two ends of the fusible element (12) in the width direction are arranged not to extend beyond the two ends of the support plate (111) in the width direction, and the two ends of the fusible element (12) in the length direction are arranged to extend beyond the two ends of the support plate (111) in the length direction, respectively. The thickness of the fusible element (12) is smaller than the thickness of the support plate (111).

2. The melt (10) with improved mechanical strength according to claim 1, characterized in that, The centerline of the fusible element (12) along its length is aligned with the centerline of the support plate (111) along its length.

3. The melt (10) with improved mechanical strength according to claim 2, characterized in that, The two ends of the support plate (111) in the width direction extend beyond the two ends of the fusible element (12) in the width direction.

4. The melt (10) with improved mechanical strength according to any one of claims 1 to 3, characterized in that, The fusible element (12) includes a fusible section (121) along its length and a pair of mounting sections (122) arranged at both ends of the fusible section (121) along its length, the two ends of the fusible section (121) along its length being aligned with the two ends of the support plate (111) along its length.

5. The melt (10) with improved mechanical strength according to claim 4, characterized in that, Each mounting section (122) includes a support section (122a) adjacent to the fusible section (121) and a connecting section (122b) bent away from the support plate (111) relative to the support section (122a).

6. The melt (10) with improved mechanical strength according to claim 4, characterized in that, The fusible section (121) includes a plurality of spaced-apart narrow sections (121a) in the length direction.

7. A fuse (100), characterized in that, The fuse (100) comprises a melt (10) having improved mechanical strength according to any one of claims 1 to 6.

8. The fuse (100) according to claim 7, characterized in that, The fuse (100) further includes a fuse tube (20) for housing the fusible element (10), a pair of terminals (40) respectively installed at both ends of the fuse tube (20) to be connected to both ends of the fusible element (10), and an arc-extinguishing medium (30) filled into the fuse tube (20) to cover the fusible element (10).

9. The fuse (100) according to claim 8, characterized in that, Each terminal block (40) includes an inner cap (41) that is connected to the fusible tube (20) in an interference fit and is connected to the corresponding end of the fusible element (10) and an outer cap (42) that is connected to the inner cap (41) in an interference fit and is connected to an external circuit.

10. The fuse (100) according to claim 9, characterized in that, Each terminal block (40) has an inner cap (41) with a through hole that allows the corresponding mounting section (122) of the molten metal (10) to pass through, so that the connection section (122b) of the corresponding mounting section (122) of the molten metal (10) can be attached to the inner cap (41) away from the surface of the molten tube (20) and connected thereto.

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