Fuse

Abstract

A fuse comprises a fuse body arranged in a fuse shell, end faces arranged at two ends of the fuse shell, a contact knife arranged on each end face, two ends of the fuse body connected to the contact knives, a cover plate covered and connected on each end face, enclosure pieces respectively connected on two end faces of the fuse shell, and an accommodating space formed between the enclosure pieces and the end faces. The height of the containing space is larger than that of the upper surface of the cover plate after the cover plate is installed on the end face, the tail end of the contact knife protrudes out of the containing space, the cover plate and the connecting position of the cover plate and the contact knife are located in the containing space, and an insulating sealant is poured into the containing space to cover the whole upper surface of the cover plate. Therefore, according to the utility model, the sealing agent can be directly poured into the accommodating space to realize filling and sealing of various mounting gaps, so that the sealing agent is concentrated on the end surface and does not scatter to all parts of the fuse shell, and the sealing effect of the fuse is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit protection, and more particularly to a fuse. Background Art

[0002] A fuse is an electrical device that generates heat to melt the fuse element when the current exceeds a specified value, disconnecting the circuit and thus protecting the circuit. A fuse is primarily composed of a fuse element, a fuse tube, and an external arc-extinguishing filler. The structure of a traditional low-voltage fuse generally includes a fuse element, an insulating shell, an arc-extinguishing filler, a cover plate, and a contact blade. The fuse element is placed in the insulating shell, and the two ends of the shell are assembled and fixed by the cover plate. The two ends of the fuse element can be welded to the contact blade, for example, to the contact blade's pad, which is fixed to the cover plate. The cover plate closes the shell, and the end of the contact blade can form a contact blade handle extending outside the cover plate (the contact blade handle can be set vertically on the pad).

[0003] In the energy storage and new energy vehicle sectors, fuses are inevitably used, for example, as circuit protection components in battery packs. Traditional battery pack cooling methods include air cooling and cold plate liquid cooling. With technological advancements, to further reduce cooling efficiency, battery pack cooling methods are gradually moving towards immersion liquid cooling. Immersion liquid cooling uses an insulating liquid with a flash point generally between 180°C and 250°C.

[0004] Since the fuse is connected and fixed by multiple accessories such as the insulating shell, cover, contact blade, etc., including the method of locking with screws, it is difficult to achieve complete sealing between the accessories and the gaps between the screws. Figure 1 Taking the fuse housing 10' in the example, the two end faces 1' of the fuse housing 10' are flat, and screw holes are provided on each end face 1' for screws to enter and lock the cover plate onto the end face 1' to seal the end face 1'. Since the screw connection cannot achieve a completely tight seal, it is difficult to prevent external gas or liquid from seeping into the fuse housing 10' through the screws and the gap between the cover plate. Therefore, when the fuse is used for circuit protection in a battery pack with immersion liquid cooling, the immersion coolant will slowly seep into the quartz sand inside the fuse over time. When a short-circuit current occurs, an arc will be generated inside the fuse at the moment of disconnection. The arc temperature can reach several thousand degrees. At this time, since the flash point of the insulating liquid is 180°C to 250°C, it will instantly ignite under the action of the arc, generating strong pressure. As a result, the fuse housing cannot withstand the pressure and will explode, thus creating a dangerous factor.

[0005] In view of this, some existing fuses use sealing materials (such as insulating materials such as silicone) to cover and seal the places where there may be gaps on the outer surface of the fuse, especially on the end face, after the fusible element, fuse housing, cover plate, contact blade and other structures are assembled into a complete fuse. However, since the sealing material is in a liquid or flowable state before pouring and molding, the flow is uncontrolled, and the surface of the fusible element shell is smooth, and there are even raised parts after the cover plate is installed, the flowing liquid sealing material cannot be fixed in the gap that needs to be sealed to dry and form. As a result, it is difficult for existing fuses to achieve a sealing effect by pouring a sealing layer on the outer surface. Utility Model Content

[0006] The purpose of the utility model is to provide a fuse with good sealing performance.

[0007] In order to achieve the above objectives, the solution of the present invention is:

[0008] A fuse includes a fuse element arranged inside a fuse housing, end surfaces at both ends of the fuse housing, a contact blade being arranged on each end surface, both ends of the fuse element being connected to the contact blades, and each end surface being covered and connected thereto, enclosures being connected to the upper ends of the two end surfaces of the fuse housing, an accommodating space being formed between the enclosures and the end surfaces, the height of the accommodating space being greater than the height of the upper surface of the cover plate after being installed on the end surfaces, the distal end of the contact blade protruding from the accommodating space, the cover plate and the connection between the cover plate and the contact blade being located within the accommodating space, and an insulating sealant being poured into the accommodating space to cover the entire upper surface of the cover plate.

[0009] Furthermore, the enclosure is a potting ring or a potting cover, the side walls of the potting ring or the potting cover are sleeved on the outer periphery of the two end surfaces of the fuse body shell, the side walls of the potting ring or the potting cover protrude from the cover plate, and an accommodating space is formed between the potting ring or the potting cover and the end surfaces of the fuse body shell.

[0010] Furthermore, circumferential steps are provided at both ends of the side wall of the fuse housing, and the outer periphery of the end surface forms a step downward, and the lower end of the side wall of the potting ring or the potting cover abuts against and is clamped on the step.

[0011] Furthermore, a first knife contact hole is provided on the cover plate, and the end of the knife contact passes through the first knife contact hole and protrudes out of the accommodating space.

[0012] Furthermore, the sealant is silicone, resin or polyurethane.

[0013] Furthermore, the enclosure is a potting ring, and an upper opening receiving groove is formed between the potting ring and the end face of the fuse housing. The end of the contact blade protrudes out of the receiving groove, and the receiving groove is filled with insulating sealant.

[0014] Furthermore, the enclosure is a potting cover, which is covered on both end faces of the fuse body shell. The potting cover includes an outer cover plate and side walls. The side walls are sleeved on the outer periphery of the end faces. The potting cover is provided on the outer cover of the end face of the fuse body to form an accommodating chamber. At least one filling hole is provided on the outer cover plate. The end of the contact blade protrudes out of the accommodating chamber. The accommodating chamber is filled with insulating sealant.

[0015] Furthermore, a first knife contact hole is provided on the cover plate, and a second knife contact hole is provided on the outer cover plate of the potting cover. The end of the knife contact passes through the first knife contact hole and the second knife contact hole in sequence and protrudes out of the accommodating cavity.

[0016] Furthermore, there are multiple filling holes, which are symmetrically arranged on the outer cover plate of the filling cap.

[0017] After adopting the above scheme, since the assembly parts of the fuse are concentrated between the end face of the fuse shell and the cover plate, contact knife and other components, they are all located in the accommodating space formed between the enclosure and the end face (in the accommodating groove or accommodating chamber formed by the potting ring or the potting cover). When pouring the sealant, the sealant can be directly poured into the accommodating space (accommodating groove or accommodating chamber) to fill and seal various installation gaps, so that the sealant is concentrated in the accommodating space and will not scatter to various places in the fuse shell, forming an effective filling seal, facilitating the sealing operation and ensuring the sealing effect, thereby ensuring the safe use of the fuse. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the existing fuse structure.

[0019] Figure 2 This is a schematic diagram of the fuse structure of the first embodiment of the present utility model (1).

[0020] Figure 3 This is a schematic diagram of the fuse structure of the first embodiment of the utility model (2).

[0021] Figure 4 This is a schematic diagram of the potting ring structure of the first embodiment of the present utility model.

[0022] Figure 5 This is a schematic diagram of the fuse structure of the second embodiment of the present invention (1).

[0023] Figure 6 This is a schematic diagram of the fuse structure of the second embodiment of the present invention (II).

[0024] Figure 7 This is a schematic diagram of the potting hole structure of the second embodiment of the present utility model.

[0025] Figure 8 This is a schematic diagram of the fuse structure of the third embodiment of the present invention (1).

[0026] Figure 9 This is a schematic diagram (2) of the fuse structure of the third embodiment of the present invention.

[0027] Figure 10 This is a schematic diagram of the potting hole structure of the third embodiment of the present utility model.

[0028] Description of the accompanying figures: 100' fuse; 10' housing; 1' end face; 2' contact blade; 21' mounting hole; 3' cover plate; 4' screw;

[0029] 100 fuse; 10 fuse housing; 2 contact blade; 3 cover plate; first contact blade hole 31; 4 screw; 5 potting ring; 6 potting cover; 61 outer cover plate; 611 potting hole; 62 side wall; 612 second contact blade hole. DETAILED DESCRIPTION

[0030] In order to further explain the technical solution of the present invention, the present invention will be described in detail below through specific embodiments.

[0031] See Figure 2 、 Figure 3 、 Figure 4 , which is a first embodiment of the fuse 100 of the present invention, includes a fuse housing 10, wherein a melt (not shown in the figure) is provided inside the fuse housing 10. The fuse housing may also be filled with an arc-extinguishing filler. The fuse housing 10 has end faces at both ends (not shown in the figure because the end faces are located below the cover plate 3), each end face is provided with a contact blade 2, and both ends of the melt inside the fuse housing 10 are connected to the contact blade 2. Each end face is also covered and connected with a cover plate 3, and a sealing gasket or sealant may be provided between the cover plate 3 and the two ends of the fuse housing.

[0032] In the present invention, enclosures are attached to the upper ends of the fuse housing 10, forming an accommodating space between the enclosures and the end faces. The height of the accommodating space is greater than the height of the upper surface of the cover plate 3 after it is installed on the end face. The distal end of the contact blade 2 protrudes outside the accommodating space. The cover plate 3 and the connection between the cover plate 3 and the contact blade 2 are both located within the accommodating space. When an insulating sealant is poured into the accommodating space, the sealant can cover the entire upper surface of the cover plate 3, thereby providing sealed protection for the end faces. The enclosures can be potting rings or potting caps. The side walls of the potting rings or potting caps can be fitted around the outer periphery of the end faces of the fuse housing 10. The side walls of the potting rings or potting caps protrude from the cover plate, forming an accommodating space for the sealant between the potting rings or potting caps and the end faces of the fuse housing.

[0033] In this embodiment, the enclosure member is a potting ring 5, which is respectively sleeved on the outer periphery of the two end surfaces of the fuse housing 10. The side walls of the potting ring 5 protrude from the cover plate 3, that is, the side walls of the potting ring 5 are higher than the cover plate 3. An upper-opening accommodating groove is formed between the potting ring 5 and the end surface of the fuse housing 10. The accommodating groove forms an accommodating space. The distal end of the contact blade 2 protrudes from the accommodating groove, and an insulating sealant can be poured into the accommodating groove.

[0034] In this embodiment, circumferential steps are provided at both ends of the side wall of the fuse housing 10 (see Figure 1 As shown in FIG), the outer periphery of the end face forms a step downward, and the lower end of the potting ring 5 can just abut and be clamped on the step, thereby achieving connection and fixation. After the potting ring 5 is sleeved on the fuse 100, the outer surface of the potting ring 5 is flush with the outer surface of the fuse housing 10, as shown in FIG. Figure 3 shown.

[0035] The fuse housing 10 in this embodiment is square in shape, and the potting ring 5 matches the shape of the fuse housing 10 and is also a square ring. The cover plate 3 has an area slightly smaller than the area of ​​the end face and covers the end face. The cover plate 3 and the end face are screwed together by screws 4, and corresponding screw holes are provided on the cover plate 3 and the end face. A first contact hole 31 is provided on the cover plate 3, and the end of the contact blade 2 protrudes outside the cavity outside the accommodating groove after passing through the first contact hole 31. A mounting hole may also be provided on the end of the contact blade 2 for connecting to an external wire. The contact blade 2 may include a contact blade disc and a contact blade handle. The end of the fuse is connected to the contact blade disc, and the contact blade handle at the end of the contact blade protrudes out of the cover plate 3.

[0036] See Figure 5 、 Figure 6 、 Figure 7 , which is a second embodiment of the fuse 100 of the present invention, the fuse includes a fuse housing 10, a melt (not shown in the figure) is provided inside the fuse housing 10, and the fuse housing may also be filled with arc-extinguishing filler. The fuse housing 10 has end faces at both ends (not shown in the figure because the end faces are located below the cover plate 3), each end face is provided with a contact blade 2, and both ends of the melt inside the fuse housing 10 are connected to the contact blade 2. Each end face is also covered and connected with a cover plate 3, and a sealing gasket or sealant may be provided between the cover plate 3 and the two ends of the fuse housing. In this embodiment, the enclosure is a potting cover 6, which is respectively covered on both end faces of the fuse housing 10. The potting cover 6 includes an outer cover plate 61 and a side wall 62. The side wall 62 is sleeved around the outer periphery of the end face. The potting cover 6 is provided on the outer surface of the end face of the fuse housing to form an accommodating chamber, which forms an accommodating space. At least one filling hole 611 is provided on the outer cover plate 61. The distal end of the contact blade 2 protrudes from the accommodating chamber, and the accommodating chamber is filled with an insulating sealant.

[0037] In this embodiment, circumferential steps are provided at both ends of the side wall of the fuse housing 10 (see Figure 1 As shown in the figure, a step is formed downward on the outer periphery of the end face, and the side wall 61 of the potting cover 6 can just abut and be stuck on the step, thereby achieving connection and fixation. After the potting cover 6 is covered on the fuse 100, the circumferential side wall 62 of the potting cover 6 is flush with the outer surface of the fuse housing 10.

[0038] In this embodiment, the fuse housing 10 is square, and the potting cover 6, also in a square shape, matches the fuse housing 10. The cover plate 3 is slightly smaller than the end face and covers the end face. The cover plate 3 is screwed to the end face via screws 4, with corresponding screw holes defined on each end face. The cover plate 3 is provided with a first contact hole 31, and the outer cover plate 61 of the potting cover 6 is also provided with a second contact hole 612. The distal end of the contact blade 2 passes through the first and second contact holes 31, 612, respectively, and then protrudes from the housing.

[0039] The second embodiment differs from the first embodiment in that the potting ring 5 is replaced with a potting cap 6. The potting cap 6 of the second embodiment is symmetrically provided with four elongated potting holes. Therefore, the accommodating chamber formed in the second embodiment differs in that, whereas the accommodating space in the first embodiment is a completely open accommodating groove, the accommodating chamber in the second embodiment is partially covered from above by the outer cover plate 61 of the potting cap 6. However, because the outer cover plate 61 of the potting cap 6 is provided with at least one potting hole 611, the upper portion of the accommodating chamber is partially open, allowing sealant to be poured into the accommodating chamber through the potting hole 611.

[0040] See Figure 8 、 Figure 9 、 Figure 10 , which is the third embodiment of the fuse 100 of the present invention. The only difference between the third embodiment and the second embodiment is that the filling hole on the potting cover 6 of the third embodiment is circular.

[0041] In the three embodiments described above, the sealant can be made of a sealing material such as silicone, resin, or polyurethane. The sealant is applied to the fuse 100 by injecting a liquid or flowable sealant directly from the accommodating cavity or pouring it into the filling hole 611. The sealant liquid level is lower than the height of the upper end of the potting ring 5 or fills the entire accommodating cavity of the potting cover 6, and the sealant liquid level is higher than the height of the cover plate 3 and the connection between the cover plate 3 and the contact blade 2. At this time, the liquid sealant can penetrate into the installation gap between the end face, the cover plate 3, and the contact blade 2. After the sealant solidifies, the installation gap is filled with the sealant, achieving complete sealing of the fuse 100.

[0042] In the present invention, since the assembly of the fuse 100 is concentrated between the end face of the fuse housing 10 and components such as the cover plate 3 and the contact blade 2, all of which are located in the accommodation space, when pouring the sealant, the sealant is directly poured into the accommodation groove formed by the potting ring 5 or the accommodation chamber formed by the potting cover 6 to fill and seal various installation gaps. This allows the sealant to be concentrated in the accommodation groove or the accommodation chamber and not to disperse to various parts of the fuse housing 10, forming an effective filling seal, facilitating the sealing operation and ensuring the sealing effect. In this way, the sealant can enter and fill each gap. After the sealant solidifies, the fuse 100 is completely sealed. Even if it is completely immersed in coolant in the use scenario as in the background technology, the coolant can be prevented from seeping into the fuse 100 and affecting circuit safety.

[0043] The above is only an embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A fuse comprising a fuse element disposed within a fuse housing, the fuse housing having end surfaces at both ends, each end surface having a contact blade, both ends of the fuse element being connected to the contact blades, and each end surface being covered and connected with a cover plate, characterized in that: Enclosures are connected to both end faces of the fuse body, forming an accommodation space between the enclosures and the end faces. The height of the accommodation space is greater than the height of the upper surface of the cover after it is installed on the end face. The end of the contact blade protrudes outside the accommodation space. The cover and the connection between the cover and the contact blade are both located within the accommodation space. An insulating sealant is poured into the accommodation space to cover the entire upper surface of the cover.

2. A fuse according to claim 1, characterized in that: The enclosing member is a potting ring or a potting cover. The side walls of the potting ring or the potting cover are sleeved on the outer periphery of the two end surfaces of the fuse body shell. The side walls of the potting ring or the potting cover protrude from the cover plate, and an accommodating space is formed between the potting ring or the potting cover and the end surfaces of the fuse body shell.

3. A fuse according to claim 2, characterized in that: Circumferential steps are provided at both ends of the side wall of the fuse housing, and the outer periphery of the end surface forms a step downward, and the lower end of the side wall of the potting ring or the potting cover abuts against and is clamped on the step.

4. A fuse according to claim 1, characterized in that: The cover plate is provided with a first knife contact hole, and the end of the knife contact passes through the first knife contact hole and protrudes out of the accommodating space.

5. The fuse according to claim 1, wherein: The sealant is silicone, resin or polyurethane.

6. A fuse according to claim 2, characterized in that: The enclosure is a potting ring, and an upper opening accommodating groove is formed between the potting ring and the end face of the fuse shell. The end of the contact blade protrudes out of the accommodating groove, and the accommodating groove is filled with insulating sealant.

7. The fuse according to claim 2, characterized in that: The enclosure is a potting cover, which is covered on both end faces of the fuse body shell. The potting cover includes an outer cover plate and side walls. The side walls are sleeved on the outer periphery of the end faces. The potting cover is provided on the outer cover of the end face of the fuse body to form an accommodating chamber. At least one filling hole is provided on the outer cover plate. The end of the contact blade protrudes out of the accommodating chamber. The accommodating chamber is filled with insulating sealant.

8. A fuse according to claim 7, characterized in that: A first knife contact hole is provided on the cover plate, and a second knife contact hole is provided on the outer cover plate of the potting cover. The end of the knife contact passes through the first knife contact hole and the second knife contact hole in sequence and protrudes out of the accommodating cavity.

9. The fuse according to claim 7, characterized in that: The filling hole is circular or long strip; there are multiple filling holes, and the filling holes are symmetrically arranged on the outer cover plate of the filling cap.

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