Fuse housing and fuse

Abstract

The utility model provides a fuse shell, two ends of the fuse shell are provided with end faces, the two end faces are provided with openings, the periphery of each end face is provided with a circle of enclosing face in an integrated and protruding mode, an accommodating portion with an upper opening is formed between each enclosing face and the corresponding end face, and the end faces form the bottom face of the accommodating portion. Therefore, the fuse shell is favorable for sealing. The utility model further provides a fuse with good sealing performance, and the fuse adopts the fuse shell.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit protection, and more particularly to a fuse housing and 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 11' 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, the arc will instantly ignite under the action of the arc, generating strong pressure. 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 housing that is conducive to sealing and a fuse with good sealing performance.

[0007] In order to achieve the above purpose, the solution of the utility model is:

[0008] A fuse shell has end faces at both ends, both end faces are provided with openings, a circle of enclosing surfaces are integrally formed on the periphery of the end faces, a receiving portion with an upper opening is formed between the enclosing surface and the end faces, and the end faces form the bottom surface of the receiving portion.

[0009] Furthermore, screw holes are provided on the end surface.

[0010] Furthermore, the shape of the fuse housing includes circular and square.

[0011] After adopting the above solution, the fuse housing of the present invention has an accommodating portion formed on the end surface. After forming a complete fuse with accessories such as the cover plate, contact blade, melt, and arc-extinguishing filler, the sealant can be directly poured into the accommodating portion to fill and seal various installation gaps. The sealant is concentrated in the accommodating portion and will not spread to various parts of the fuse housing, thereby ensuring the sealing effect.

[0012] Furthermore, the material of the fuse housing is ceramic, glass fiber, DMC, nylon, PBT, PET, PP or PC.

[0013] A fuse comprises the above-mentioned fuse housing, with a cover plate that can cover the opening connected to the end face, the end of the contact blade protruding from the cover plate, the two ends of the melt inside the fuse housing are connected to the contact blade, the height of the enclosing surface is greater than the height of the upper surface of the rear of the cover plate when it is installed on the end face, the cover plate and the connection between the cover plate and the contact blade are both located in the accommodating portion, and the accommodating portion is filled with an insulating sealant that covers the entire upper surface of the cover plate.

[0014] Furthermore, a through hole is provided in the center of the cover plate for the end of the touch knife to pass through. One end of the touch knife is welded to the melt, and the other end of the touch knife passes through the through hole and protrudes outside the accommodating portion.

[0015] Furthermore, corresponding screw holes are provided on the end surface and the cover plate, and the cover plate is screwed onto the end surface.

[0016] Furthermore, the screw holes on the end surface are located around the opening.

[0017] Furthermore, the interior of the fuse housing is filled with arc-extinguishing filler, and a sealing gasket or sealant is provided between the cover plate and the end face.

[0018] Furthermore, the sealant is silicone, resin or polyurethane.

[0019] After adopting the above solution, since the assembly parts of the fuse are concentrated between the end face of the fuse housing and the cover plate, contact blade and other components, all of which are located in the accommodating portion, after the sealant is poured, the sealant can enter and fill all the gaps. After the sealant solidifies, the fuse is completely sealed. Even if the usage scenario is completely immersed in coolant as in the background technology, the coolant can be prevented from seeping into the fuse and affecting the circuit safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of an existing fuse housing;

[0021] Figure 2 This is a schematic diagram of the fuse housing structure of the present utility model;

[0022] Figure 3 for Figure 2 Top view;

[0023] Figure 4 This is a schematic diagram of the fuse structure of the present utility model.

[0024] Description of the accompanying figures: 10' fuse housing; 1' end face; 11' screw hole;

[0025] 10 fuse housing; 1 end face; 11 screw hole; 12 opening; 13 enclosure surface; 100 fuse; 2 contact blade; 21 mounting hole; 3 cover plate; 4 screw. DETAILED DESCRIPTION

[0026] In order to further explain the technical solution of the present invention, the present invention will be described in detail below through specific embodiments.

[0027] See Figure 2 、 Figure 3 As shown, a fuse housing 10 of the present invention has end surfaces 1 at both ends of the fuse housing 10 for assembling a cover plate 3 and a contact blade 2. An opening 12 is provided on each end surface 1. A circle of enclosing surfaces 13 are integrally formed and protruded from the periphery of the end surface 1. A receiving portion with an upper opening 12 is formed between the enclosing surface 13 and the end surface 1 of the fuse housing 10. The end surface 1 forms the bottom of the receiving portion, and the enclosing surface 13 forms the peripheral wall of the receiving portion.

[0028] Furthermore, end face 1 is provided with screw holes 11 for connection to cover plate 3. The fuse housing 10 can be round or square in shape, and can also be designed in other shapes depending on the application scenario. The fuse housing 10 can be made of engineering plastics such as ceramic, fiberglass, DMC, nylon, PBT, PET, PP, and PC.

[0029] The fuse housing 10 in this embodiment is square, with square openings 12 provided in both end faces 1. Screw holes 11 are provided in the corners around the openings 12 for mounting the cover plate 3. The provision of the integrally formed enclosure surface 13 allows the fuse housing 10 to form a receiving portion on the end face 1. The receiving portion forms a receiving space that can accommodate a sealant in a liquid state. This facilitates the direct pouring of sealant into the receiving portion to fill and seal various installation gaps after the fuse housing 10 is assembled with accessories such as the cover plate 3, the contact blade 2, the melt, and the arc-extinguishing filler to form a complete fuse 100. This allows the sealant to be concentrated in the receiving portion and not dispersed throughout the fuse housing 10, forming an effective filling seal that facilitates the sealing operation and ensures the sealing effect. The height of the enclosure surface 13 needs to be sufficient to contain the connection between the cover plate 3 and the contact blade 2 within the range of the receiving portion.

[0030] In other embodiments, the shape of the fuse housing 10 is not limited, and it is only required that a blocking surface 13 is integrally formed on the periphery of the end surface 1 of the fuse housing 10 so as to form an accommodating portion on the end surface 1 .

[0031] See Figure 4 , is a fuse 100 of the present invention, comprising the fuse housing 10 of the above-described embodiment. A melt is disposed within the fuse housing 10 and filled with arc-extinguishing filler. A cover plate 3, which covers an opening 12, is connected to the end face 1. The distal end of the contact blade 2 protrudes from the cover plate 3. Both ends of the melt (not shown) within the fuse housing are connected to the contact blade 2. The height of the enclosure surface 13 is greater than the height of the rear upper surface of the cover plate 3 after it is mounted on the end face 1. The cover plate 3 and the connection between the cover plate 3 and the contact blade 2 are both located within the accommodating portion. The distal end of the contact blade 2 protrudes from the accommodating portion. The accommodating portion is filled with an insulating sealant that covers the entire upper surface of the cover plate 3.

[0032] A through-hole is provided in the center of the cover 3 for the distal end of the contact blade 2 to pass through. One end of the contact blade 2 passes through the through-hole in the cover 3 and welds to the melt in the opening 12 of the fuse housing 10. The other end of the contact blade 2 protrudes out of the through-hole and projects beyond the receiving portion. The portion of the contact blade 2 that protrudes out of the through-hole can be provided with a mounting hole 21 for connecting to an external wire.

[0033] In this embodiment, corresponding screw holes 11 are provided on the end face 1 and the cover plate 3, and the cover plate 3 is screwed to the end face 1. Specifically, the end face 1 is square in shape, with screw holes 11 located at its four corners. The corresponding openings 12 on the cover plate 3 are also square in shape, with screw holes 11 corresponding to the end face 1 at each corner. Screws 4 pass through the screw holes 11 to secure the cover plate 3 to the end face 1. To further enhance the sealing effect, a sealing gasket or sealant may be provided between the cover plate 3 and the end face 1.

[0034] In the structure of the fuse 100 described above, the sealant can be made of silicone, resin, polyurethane, or other sealing materials. The sealant is applied to the fuse 100 by pouring liquid or flowable sealant from the upper opening of the accommodating portion to fill the entire accommodating portion. The sealant liquid level is lower than the height of the enclosing surface 13 and higher than the height of the cover plate 3 and the connection between the cover plate 3 and the contact blade 2. At this point, the liquid sealant can penetrate into the installation gap between the end face 1, 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.

[0035] Since the fuse 100 of the above embodiment is completely sealed, in addition to being used in ordinary scenarios, it can also be used to protect the fully immersed liquid-cooled battery pack mentioned in the background technology, and can ensure that the coolant does not enter the interior of the fuse 100, thereby ensuring circuit safety.

[0036] 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 housing having end surfaces at both ends, each end surface being provided with an opening, characterized in that: A circle of enclosing surface is integrally formed on the periphery of the end face, and an accommodating portion with an upper opening is formed between the enclosing surface and the end face, and the end face forms the bottom surface of the accommodating portion.

2. A fuse housing according to claim 1, characterized in that: The end face is provided with a screw hole.

3. The fuse housing according to claim 1, wherein: The shapes of fuse shells include round and square.

4. The fuse housing according to claim 1, wherein: The fuse housing is made of ceramic, glass fiber, DMC, nylon, PBT, PET, PP or PC.

5. A fuse, characterized in that: A fuse housing comprising any one of claims 1 to 4, wherein a cover plate capable of covering an opening is connected to the end face, the end of the contact blade protrudes from the cover plate, both ends of the melt inside the fuse housing are connected to the contact blade, the height of the enclosing surface is greater than the height of the rear upper surface of the cover plate when installed on the end face, the cover plate and the connection between the cover plate and the contact blade are both located in the accommodating portion, and the accommodating portion is poured with an insulating sealant covering the entire upper surface of the cover plate.

6. A fuse according to claim 5, characterized in that: A through hole is provided in the center of the cover plate for the end of the touch knife to pass through. One end of the touch knife is welded to the melt, and the other end of the touch knife passes through the through hole and protrudes outside the accommodating portion.

7. The fuse according to claim 5, characterized in that: Corresponding screw holes are provided on the end surface and the cover plate, and the cover plate is screwed on the end surface.

8. The fuse according to claim 5, characterized in that: The screw holes on the end face are located around the opening.

9. The fuse according to claim 5, characterized in that: The interior of the fuse housing is filled with arc-extinguishing filler, and a sealing gasket or sealant is provided between the cover plate and the end face.

10. The fuse according to claim 5, characterized in that: The sealant is silicone, resin or polyurethane.

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