Fuse packaging structure, fuse and battery protection board

Abstract

The utility model relates to the technical field of fuses, in particular to a fuse packaging structure, a fuse and a battery protection board. The fuse packaging structure comprises a packaging main body, a substrate and a melt arranged on the substrate, the packaging main body is used for covering the melt on the substrate, the surface of the side, facing the substrate, of the packaging main body is the lower surface of the packaging main body, and at least part of the area, opposite to the melt, in the lower surface of the packaging main body does not make contact with the melt. According to the fuse provided by the utility model, the lower surface of the packaging main body and the fuse body form a cavity, so that the cavity can be used for accommodating gas generated when the fuse body is fused, and a gas release hole for exhausting is not formed in a substrate of the fuse, so that the manufacturing difficulty of the fuse is reduced; and meanwhile, the failure of the fuse caused by water vapor entering the interior of the fuse can be effectively avoided.

Description

Technical Field

[0001] The present application relates to the technical field of fuses, and in particular to a fuse packaging structure, a fuse, and a battery protection board. Background Art

[0002] Fuses are usually installed in protective circuits so that when an overcurrent or short circuit fault occurs in the circuit, the fuse element can melt to cut off the circuit and prevent the fault from further expanding.

[0003] A fuse generally includes a substrate and a melt disposed on the substrate, and an encapsulation layer is provided on the outside of the melt. The current encapsulation layer is square as a whole and tightly covers the melt without leaving any gaps. However, the melt will produce gas when it melts. In order to exhaust the gas, a vent hole is usually provided on the substrate. This not only increases the difficulty of manufacturing the fuse, but also makes it easy for water vapor to enter the interior of the fuse, causing failure. Utility Model Content

[0004] The purpose of the present invention is to provide a fuse packaging structure, a fuse and a battery protection plate, so as to eliminate the air leakage holes on the substrate, reduce the difficulty of manufacturing the fuse to a certain extent, and reduce the risk of fuse failure.

[0005] A first aspect of the present utility model provides a fuse packaging structure, comprising a packaging body;

[0006] The packaging body is used to cover the fuse element on the fuse substrate;

[0007] The side surface of the package body facing the substrate is the lower surface of the package body. At least a portion of the lower surface of the package body opposite to the melt does not contact the melt, so as to form a cavity between the package body and the melt.

[0008] Furthermore, the volume of the cavity is A, the volume of gas released when the melt is melted is a, and 0.75≤A / a≤1.2.

[0009] Furthermore, the area of ​​the lower surface of the packaging body facing the melt is arc-shaped, and the arc-shaped area of ​​the lower surface of the packaging body is arched in a direction away from the melt;

[0010] Alternatively, a region of the lower surface of the packaging body facing the melt is wavy.

[0011] Furthermore, the melt completely falls within the coverage of the arc-shaped area or the wavy area on the lower surface of the packaging body.

[0012] Furthermore, a groove is formed in an area of ​​the lower surface of the packaging body opposite to the melt;

[0013] The groove includes a top wall and a side wall surrounding the top wall;

[0014] The top wall is in an arc shape that arches away from the melt; or, the top wall is in a wave shape.

[0015] Furthermore, a groove is formed in an area of ​​the lower surface of the packaging body opposite to the melt;

[0016] The groove includes a top wall and side walls arranged around the top wall, and the top wall is wavy.

[0017] Furthermore, the package body has a square shape;

[0018] Alternatively, the packaging body as a whole is in a wave shape or an arc shape that arches away from the melt.

[0019] Furthermore, the package body is formed with a first packaging portion and a second packaging portion along its thickness direction;

[0020] The second packaging part is located on a side of the first packaging part facing the substrate, a surface of the second packaging part facing away from the first packaging part forms a lower surface of the packaging body, and a material hardness of the second packaging part is less than that of the first packaging part.

[0021] Furthermore, the thickness of the package body is d, 0.65 mm ≤ d ≤ 1.0 mm.

[0022] A second aspect of the present invention provides a fuse, comprising a substrate, a fuse element, and any one of the above-mentioned fuse packaging structures, wherein the fuse element is located on the substrate, and the fuse packaging structure covers the fuse element on the substrate.

[0023] A third aspect of the present invention provides a battery protection board, comprising any of the fuses described above.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] The present invention provides a fuse package structure comprising a package body. The package body is configured to cover a substrate and a melt disposed on the substrate, thereby encapsulating the melt on the substrate. The package body's surface facing the substrate serves as its lower surface, and at least a portion of the lower surface of the package body that faces the melt does not contact the melt. This creates a cavity between the lower surface of the package body and the melt, thereby containing gas generated when the melt is blown.

[0026] Therefore, through the packaging structure of the present application, there is no need to set up exhaust holes on the fuse substrate, thereby reducing the difficulty of manufacturing the fuse; at the same time, it can also effectively prevent water vapor from entering the interior of the fuse and causing fuse failure.

[0027] The utility model also provides a fuse and a battery protection board including the fuse. The fuse includes the fuse packaging structure, so the fuse and the battery protection board also have the beneficial effects of the fuse packaging structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 A schematic structural diagram of a fuse packaging structure provided by an embodiment of the present utility model;

[0030] Figure 2 Another structural schematic diagram of a fuse packaging structure provided by an embodiment of the present utility model;

[0031] Figure 3 A schematic diagram of another structure of the fuse packaging structure provided by an embodiment of the present utility model;

[0032] Figure 4 This is another structural schematic diagram of the fuse packaging structure provided by an embodiment of the present utility model.

[0033] Reference numerals:

[0034] 1-substrate, 2-melt, 3-package body, 4-cavity. DETAILED DESCRIPTION

[0035] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0036] The components of the embodiments of the present invention generally described and shown in the drawings herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention.

[0037] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

[0038] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0040] Refer to the following Figures 1 to 4 The present invention is described in accordance with some embodiments of the present application.

[0041] A first aspect of the present application provides a fuse packaging structure.

[0042] like Figure 1 As shown, the fuse packaging structure provided in the present application includes a packaging body 3. For the substrate 1 and the melt 2 arranged on the substrate 1, the packaging body 3 is used to cover the melt 2 on the substrate 1, so that the melt 2 is packaged on the substrate 1 using the packaging body 3.

[0043] The side surface of the packaging body 3 facing the substrate 1 is the lower surface of the packaging body 3, and at least a portion of the lower surface of the packaging body 3 opposite to the melt 2 does not contact the melt 2, so that a cavity 4 is formed between the lower surface of the packaging body 3 and the melt 2, so that the cavity 4 can be used to accommodate the gas generated when the melt 2 is melted.

[0044] Therefore, the packaging structure of the present application eliminates the need for exhaust holes on the fuse substrate 1, thereby reducing the difficulty of fuse manufacturing. Furthermore, it effectively prevents moisture from entering the fuse interior and causing fuse failure. It should be noted that the shape of the cavity 4 mentioned in the present application can be square, oval, or other shapes, and the specific shape can be set according to requirements.

[0045] In one embodiment of the present application, preferably, the volume of gas released when the melt 2 melts is a, the volume of the cavity 4 is A, 0.75≤A / a≤1.2, for example, A / a is 0.8, 0.9, 1.0 or 1.1; thereby, the cavity 4 can be used to accommodate the gas generated when the melt 2 melts, and it can be ensured that the packaging body 3 will not break.

[0046] In one embodiment of the present application, preferably, Figure 1 As shown, the lower surface of the package body 3, which faces the melt 2, is curved, and the lower surface of the package body 3 in this curved area arches away from the melt 2, so that the lower surface of the package body 3 in the curved area does not contact the melt 2. Thus, a cavity 4 is formed between the package body 3 and the melt 2, which serves as a vent space for accommodating gas when the melt 2 melts and generates gas. Preferably, the melt falls completely within the coverage area of ​​the curved area on the lower surface of the package body.

[0047] By setting the area on the lower surface of the packaging body 3 opposite to the melt 2 into an arc shape, not only can the above-mentioned exhaust space be formed to eliminate the air leakage hole structure of the fuse on the substrate 1, but the arc surface also has good stress resistance and good deformation ability. While ensuring the strength so that the packaging body 3 is not easily broken by the gas generated by the melting of the melt 2, the thickness of the packaging body 3 can be thinned to a certain extent, which is beneficial to the miniaturization design of the fuse and the optimization of the thickness of the battery protection board provided with the fuse, so as to facilitate the miniaturization design of the battery protection board and maximize the space utilization efficiency of the battery protection board.

[0048] In this embodiment, preferably, the package body 3 has a square shape; or the package body 3 is arc-shaped as a whole, so as to further reduce the size of the package body 3 to achieve the purpose of miniaturization design of the fuse and the battery protection board.

[0049] In one embodiment of the present application, preferably, Figure 2 As shown, the lower surface of the package body 3, which faces the melt 2, is wavy, thereby forming a cavity 4 between the lower surface of the package body 3 in the wavy area and the melt 2. This cavity 4 serves as an exhaust space for accommodating gas when the melt 2 melts and generates gas. Preferably, the melt falls completely within the coverage area of ​​the wavy area on the lower surface of the package body.

[0050] Thus, the wave-shaped surface makes the packaging body 3 have good stress resistance and good deformation ability, so that the packaging body 3 is not easily broken by the gas generated when the fuse 2 is melted, and at the same time, it is beneficial to the miniaturization design of the fuse and the battery protection plate provided with the fuse.

[0051] In this embodiment, preferably, the outer shape of the packaging body 3 is square; or the packaging body 3 is wave-shaped as a whole, so as to further reduce the size of the packaging body 3 and achieve the purpose of miniaturization design.

[0052] In an embodiment of the present application, preferably, the area of the lower surface of the packaging body 3 opposite to the fuse 2 forms a plurality of square recesses or a plurality of V-shaped recesses.

[0053] The lower surface of the packaging body is not limited to the arc-shaped or wave-shaped surface described above, and the shape of the recess formed is also not limited to the square or V-shaped recess described above, as long as the area of the lower surface of the packaging body opposite to the fuse forms a cavity that does not contact.

[0054] In an embodiment of the present application, preferably, as shown in Figure 3 the area of the lower surface of the packaging body 3 opposite to the fuse 2 forms a groove, which includes a top wall and a side wall surrounding the top wall, the side wall surrounding the top wall forms a square accommodating space, and the fuse is located in the accommodating space.

[0055] The top wall of the groove can be a plane that does not contact the upper surface of the fuse, that is, the groove is a square groove. Alternatively, the top wall of the groove is arc-shaped, or as shown in Figure 4 the top wall of the groove is wave-shaped; or the top wall of the groove can also be provided with a plurality of square or V-shaped recesses.

[0056] Thus, the groove forms the cavity 4 between the packaging body 3 and the fuse 2 that can be used as an exhaust space, and by setting the top wall of the groove to be arc-shaped or wave-shaped, the good stress resistance and good deformation ability of the arc-shaped surface and the wave-shaped surface can be utilized to make the packaging body 3 not easily broken by the gas generated when the fuse 2 is melted. At the same time, the volume of the cavity 4 used as the exhaust space can also be increased to some extent, so that the packaging body 3 is less likely to be broken.

[0057] In an embodiment of the present application, preferably, the packaging body 3 is formed with a first packaging portion and a second packaging portion along the thickness direction of the packaging body 3, the second packaging portion is located on the side of the first packaging portion facing the substrate 1, that is, the side surface of the second packaging portion away from the first packaging portion is the lower surface of the packaging body 3 described above, and the second packaging portion has a smaller material hardness than the first packaging portion, so that the second packaging portion can be more easily deformed to release more space for the discharge of the gas generated when the fuse 2 is melted.

[0058] In one embodiment of the present application, preferably, the thickness of the packaging body 3 is d, by setting the area opposite to the melt 2 of the lower surface of the packaging body 3 as an arc or a wave shape, the thickness of the packaging body 3 can be reduced to between 0.65mm and 1.0mm, such as the thickness of the packaging is 0.7mm, 0.8mm or 0.9mm to achieve the design purpose of miniaturization.

[0059] The second aspect of the present application provides a fuse.

[0060] The fuse provided by the present application comprises the fuse packaging structure provided by any one of the above embodiments, so that the fuse has all the beneficial effects of the fuse packaging structure, which will not be repeated here.

[0061] The third aspect of the present application provides a battery protection plate.

[0062] The battery protection plate provided by the present application comprises the fuse, so that the battery protection plate also has all the beneficial effects of the fuse packaging structure, which will not be repeated here.

[0063] Finally, it should be pointed out that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the above embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A fuse packaging structure, characterized in that: including a packaging body; The packaging body is used to cover the fuse element on the fuse substrate; The side surface of the package body facing the substrate is the lower surface of the package body. At least a portion of the lower surface of the package body opposite to the melt does not contact the melt, so as to form a cavity between the package body and the melt.

2. The fuse packaging structure according to claim 1, characterized in that: The volume of the cavity is A, the volume of gas released when the melt is melted is a, and 0.75≤A / a≤1.

2.

3. The fuse packaging structure according to claim 1, characterized in that: The area of ​​the lower surface of the packaging body facing the melt is arc-shaped, and the arc-shaped area of ​​the lower surface of the packaging body is arched in a direction away from the melt; Alternatively, a region of the lower surface of the packaging body facing the melt is wavy.

4. The fuse packaging structure according to claim 3, characterized in that: The melt completely falls within the coverage of the arc-shaped area or the wavy area on the lower surface of the packaging body.

5. The fuse packaging structure according to claim 1, characterized in that: A groove is formed in an area of ​​the lower surface of the packaging body opposite to the melt; The groove includes a top wall and a side wall surrounding the top wall; The top wall is in an arc shape that arches away from the melt; or, the top wall is in a wave shape.

6. The fuse packaging structure according to claim 1, characterized in that: The package body has a square shape; or The packaging body is in a wave shape or an arc shape that arches away from the melt.

7. The fuse packaging structure according to any one of claims 1 to 6, characterized in that: The package body is formed with a first package portion and a second package portion along its thickness direction; The second packaging part is located on a side of the first packaging part facing the substrate, a surface of the second packaging part facing away from the first packaging part forms a lower surface of the packaging body, and a material hardness of the second packaging part is less than that of the first packaging part.

8. The fuse packaging structure according to any one of claims 1 to 6, characterized in that: The thickness of the package body is d, 0.65 mm ≤ d ≤ 1.0 mm.

9. A fuse, characterized in that: The invention comprises a substrate, a fuse and the fuse packaging structure according to any one of claims 1 to 8, wherein the fuse is located on the substrate, and the fuse packaging structure covers the fuse on the substrate.

10. A battery protection board, characterized in that: Including the fuse according to claim 9.

Images