Special fuse for charging

Abstract

The utility model discloses a special fuse for charging, which relates to the field of fuse design and comprises two conductors and a fuse piece, the two conductors are symmetrically arranged up and down, the upper end and the lower end of the fuse piece are detachably mounted on the side walls of the upper conductor and the lower conductor respectively, and a narrowing edge is formed in the middle of the fuse piece. Fluxing rods are formed in the middles of the inner sides of the conductors, the fluxing rods of the two conductors are vertically separated from each other, and the ends of the fluxing rods are located on the outer sides of the narrowing edges; compared with the prior art, when the fuse piece reaches a preset temperature due to a circuit fault or abnormity, the fluxing cap can instantly burn to generate high temperature, the middle part of the fuse piece can be quickly fused, and the fluxing cap can assist the narrowed edge of the fuse piece to be fused, so that the sensitivity of the fuse is improved, and the safety during charging is ensured; during normal operation, electric power can be transmitted through the safety piece; and after the safety piece is fused, the safety piece can be independently replaced, so that repeated use is realized, and the cost is saved.

Description

Technical Field

[0001] The utility model relates to the field of fuse design, in particular to a fuse dedicated for charging. Background Art

[0002] The thermal fuse is also called a fuse, which is an electrical component installed in a circuit to ensure the safe operation of the circuit. The function of the fuse is that when a circuit fails or is abnormal, along with the continuous increase of the current, and the increased current may damage some important devices or valuable devices in the circuit, or may even burn out the circuit and cause a fire. As a new type of environment-friendly vehicle, the power of a new energy vehicle is very high during charging, so necessary protection is essential.

[0003] At present, generally, an alloy type thermal fuse is used as the main fuse. For example, in the prior art (Publication No.: CN205211839U, Publication Date: May 4, 2016), a connecting piece for a lithium-ion power battery pack is disclosed, which fuses a fuse piece with a metal plate, and reduces the contact internal resistance through processes such as riveting and soldering, and can effectively disconnect the current loop in the out-of-control state of the battery pack to prevent the occurrence of safety accidents, thereby providing more effective safety protection.

[0004] However, in the above scheme, the sensitivity of the fuse piece is poor, and it cannot be fused instantly when a charging circuit fails or is abnormal. Moreover, it is fixed by riveting or soldering, and after the fuse piece is fused, it needs to be replaced together with the metal plate, resulting in a high cost.

[0005] Therefore, it is necessary to design a fuse dedicated for charging to solve the above problems. Content of the Utility Model

[0006] The utility model provides a technical solution that can solve the above problems to overcome the above deficiencies.

[0007] A fuse dedicated for charging includes two conductors and a fuse piece. The two conductors are symmetrically arranged up and down with respect to each other. The upper and lower ends of the fuse piece are respectively detachably installed on the side walls of the upper and lower two conductors. A narrowing edge is formed in the middle of the fuse piece. A melting assisting rod is formed in the middle of the inner side of the conductor. The melting assisting rods between the two conductors are spaced apart up and down from each other, and the end of the melting assisting rod is located outside the narrowing edge.

[0008] Further: There are two fuse pieces, and the conductor is installed between the two fuse pieces.

[0009] Further: There are two narrowing edges, and the axes of the two melting assisting rods are both located between the four narrowing edges of the two fuse pieces.

[0010] Furthermore, a number of first bolt holes are formed at both the upper and lower ends of the fuse piece, and a number of second bolt holes are formed on the conductor. The upper and lower ends of the fuse piece are respectively locked by bolts passing through the first bolt holes and the second bolt holes.

[0011] Furthermore, a fuse cap is formed at the end of the fuse rod, and the fuse cap has a spherical structure.

[0012] Furthermore, a ceramic tube is sleeved and installed outside the two conductors. End caps are fixedly installed at both the upper and lower ends of the ceramic tube. A square hole is formed in the middle of the end cap. The two conductors are installed in the square holes of the two end caps in a one-to-one correspondence with clearance fit.

[0013] Furthermore, a stepped shape is formed between the side wall of the conductor and the fuse piece, and the upper and lower side edges of the fuse piece respectively abut against the inner side surface of the end cap.

[0014] Furthermore, thermal conductive silicone grease is filled and installed between the conductor and the square hole of the end cap.

[0015] Furthermore, explosion-proof rings are formed at the outer edges of the two end caps. The two explosion-proof rings are respectively sleeved and installed at the upper and lower ends of the ceramic tube, and the outer diameter of the explosion-proof ring is greater than the outer diameter of the ceramic tube.

[0016] Furthermore, acid-free paper is attached and installed on the outer side of the ceramic tube.

[0017] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0018] 1. When a circuit fault or abnormality occurs and the fuse piece reaches a predetermined temperature, the fuse cap on the fuse rod will instantly burn to generate high temperature, and the narrowed edge in the middle of the fuse piece will quickly melt. The setting of the fuse cap can assist the narrowed edge of the fuse piece to melt, thereby improving the sensitivity of the fuse, and it can melt instantly when reaching the predetermined temperature, without affecting the charging circuit, thus ensuring the safety during charging;

[0019] 2. During normal operation, electricity can be transmitted through the fuse piece. Since the fuse piece can be disassembled and replaced individually, there is no need to replace the whole when it melts, which is convenient, fast and cost-saving.

[0020] The additional aspects and advantages of the present utility model will be partially given in the following description, partially will become obvious from the following description, or can be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0022] Figure 1 is a schematic structural diagram of the present invention;

[0023] Figure 2 is a schematic structural diagram of the present invention after the ceramic tube;

[0024] Figure 3 is an exploded structural diagram of the present invention.

[0025] As shown in the figure: 1. Conductor; 2. Fuse piece; 3. Narrowed edge; 4. Flux rod; 5. First bolt hole; 6. Second bolt hole; 7. Flux cap; 8. Ceramic tube; 9. End cover; 10. Square hole; 11. Explosion-proof ring; 12. Acid-free paper; 13. Welding hole. Detailed implementation manners

[0026] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention.

[0027] The components of the embodiments of the present invention usually described and shown in the drawings here can be arranged and designed in various 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 present invention to be protected, but only represents the selected embodiments of the present invention.

[0028] All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0029] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0030] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0031] As Figures 1-3 shown, a fuse dedicated for charging of the present utility model includes two conductors 1 and a fuse piece 2. The two conductors 1 are symmetrically arranged up and down with respect to each other. The upper and lower ends of the fuse piece 2 are respectively detachably installed on the side walls of the upper and lower conductors 1. A narrowing edge 3 is formed in the middle of the fuse piece 2. A melting assisting rod 4 is formed in the middle of the inner side of the conductor 1. The melting assisting rods 4 between the two conductors 1 are spaced apart from each other up and down. The end of the melting assisting rod 4 is located outside the narrowing edge 3.

[0032] The principle is as follows: When in use, the wires for charging a new energy vehicle are connected to the two conductors 1. During normal operation, electricity can be transmitted through the fuse piece 2. Since the fuse piece 2 can be individually detached and replaced, there is no need to replace the whole when it melts, which is convenient, fast, and cost-saving. When a circuit fault occurs or the fuse piece 2 reaches a predetermined temperature, the end of the melting assisting rod 4 will instantly burn to generate high temperature, and the narrowing edge 3 in the middle of the fuse piece 2 will quickly melt. The setting of the melting assisting rod 4 can assist the narrowing edge 3 of the fuse piece 2 to melt, thereby improving the sensitivity of the fuse, and can melt instantly when a circuit fault or abnormality causes the fuse piece 2 to reach the predetermined temperature, without affecting the charging circuit, and thus ensuring the safety during charging.

[0033] Furthermore: There are two fuse pieces 2, and the conductor 1 is installed between the two fuse pieces 2. The setting of the two fuse pieces 2 can ensure the stable connection of the charging circuit and can bear a higher charging power during normal use.

[0034] Furthermore: There are two narrowing edges 3, and the axes of the two melting assisting rods 4 are both located between the four narrowing edges 3 of the two fuse pieces 2. When a fault or abnormality occurs in the charging circuit, the melting assisting rods 4 can heat the four narrowing edges 3 of the fuse piece 2 simultaneously, causing it to melt quickly, thereby effectively protecting the charging circuit of the new energy vehicle.

[0035] Further: A number of first bolt holes 5 are formed at both the upper and lower ends of the fuse piece 2, and a number of second bolt holes 6 are formed on the conductor 1. The upper and lower ends of the fuse piece 2 are respectively locked by bolts passing through the first bolt holes 5 and the second bolt holes 6. The detachable installation of the fuse piece 2 can be realized by means of bolt locking, thereby ensuring stable electrical connection. At the same time, after the fuse piece 2 is melted, it can be replaced separately, effectively saving costs and enabling the present utility model to be reused after replacing the fuse piece 2.

[0036] Further: A fuse cap 7 is formed at the end of the fuse rod 4, and the fuse cap 7 has a spherical structure. When a fault or abnormality occurs in the charging circuit and the fuse piece 2 reaches a predetermined temperature, the heat between the two conductors 1 can quickly gather on the fuse cap 7 of the fuse rod 4, causing the fuse cap 7 to burn instantly to generate high temperature, and then quickly heating the narrowed edge 3 of the fuse piece 2 to melt it.

[0037] In the present utility model, the fuse cap 7 will generate high temperature to assist the narrowed edge 3 of the fuse piece 2 to melt instantly when exceeding the rated current and temperature of the fuse.

[0038] Further: A ceramic tube 8 is sleeved and installed on the outer sides of the two conductors 1. End caps 9 are fixedly installed at both the upper and lower ends of the ceramic tube 8. A square hole 10 is formed in the middle of the end cap 9. The two conductors 1 are installed in the square holes 10 of the two end caps 9 in a one-to-one correspondence and clearance fit. The end cap 9 can be used as a heat dissipation ring, and the heat generated when the fuse piece 2 works can be transferred to the heat dissipation ring through the fuse piece 2 itself and the conductor 1 for heat dissipation.

[0039] Further: A stepped shape is formed between the side wall of the conductor 1 and the fuse piece 2, and the upper and lower side edges of the fuse piece 2 are respectively abutted against the inner side surfaces of the end caps 9. It can ensure the stable assembly of the end caps 9, the heat of the fuse piece 2 can be quickly transferred to the end caps 9 to achieve rapid heat dissipation, and at the same time, the end caps 9 can provide effective protection for the fuse piece 2 after being assembled.

[0040] Further: A thermal conductive silicone grease (not shown in the figure) is filled and installed between the conductor 1 and the square hole 10 of the end cap 9. The setting of the thermal conductive silicone grease can enable the heat on the conductor 1 to be quickly transferred to the end cap 9, thereby achieving the effect of rapid heat dissipation.

[0041] Further: Explosion-proof rings 11 are formed at the outer edges of both end caps 9. The two explosion-proof rings 11 are respectively sleeved and installed at the upper and lower ends of the ceramic tube 8. The outer diameter of the explosion-proof ring 11 is larger than the outer diameter of the ceramic tube 8. The protruding setting of the explosion-proof ring 11 can effectively protect the ceramic tube 8, prevent the ceramic tube 8 from directly contacting the ground, and thereby reduce the risk of the ceramic tube 8 breaking.

[0042] Furthermore: An acid-free paper 12 is adhesively attached to the outer side of the ceramic tube 8; the acid-free paper 12 can be used as a label for adhesion, and the acid-free paper 12 can increase the strength of the ceramic tube 8, reduce the risk of explosion of the ceramic tube 8 and the harm caused during explosion.

[0043] Furthermore: A welding hole 13 is formed on the side of the conductor 1; this can facilitate the connection and use of the conductor 1 in the charging circuit.

[0044] This embodiment does not impose any formal restrictions on the shape, material, structure, etc. of the present utility model. Any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present utility model all fall within the protection scope of the technical solution of the present utility model.

Claims

1. A fuse dedicated to charging, characterized in that: It includes two conductors and a fuse sheet. The two conductors are symmetrically arranged up and down. The upper and lower ends of the fuse sheet can be detachably installed on the side walls of the upper and lower conductors respectively. A narrowed edge is formed in the middle of the fuse sheet, and a flux rod is formed in the middle of the inner side of the conductor. The flux rods of the two conductors are spaced apart from each other up and down, and the end of the flux rod is located on the outside of the narrowed edge.

2. A charging-only fuse according to claim 1, characterized in that: Two fuse sheets are provided, and the conductor is installed between the two fuse sheets.

3. A charging-only fuse according to claim 2, characterized in that: Two narrowing edges are provided, and the axes of the two flux rods are both located between the four narrowing edges of the two safety sheets.

4. A charging-only fuse according to any one of claims 1 or 2, characterized in that: A plurality of first bolt holes are formed at both upper and lower ends of the safety piece, and a plurality of second bolt holes are formed on the conductor. The upper and lower ends of the safety piece are locked by bolts passing through the first bolt holes and the second bolt holes respectively.

5. A charging-only fuse according to any one of claims 1 or 2, characterized in that: A flux cap is formed at the end of the flux rod, and the flux cap is in a spherical structure.

6. A charging-only fuse according to any one of claims 1 or 2, characterized in that: A ceramic tube is installed on the outer side of the two conductors, and end covers are fixedly installed on the upper and lower ends of the ceramic tube. A square hole is formed in the middle of the end cover, and the two conductors are installed in the square holes of the two end covers with corresponding clearances.

7. A charging-only fuse according to claim 6, characterized in that: A step shape is formed between the side wall of the conductor and the safety piece, and upper and lower side edges of the safety piece are respectively abutted against the inner side surface of the end cover.

8. A charging-only fuse according to claim 7, characterized in that: Thermal conductive silicone grease is filled and installed between the conductor and the square hole of the end cover.

9. A charging-only fuse according to claim 6, characterized in that: Explosion-proof rings are formed at the outer edges of the two end covers. The two explosion-proof rings are respectively mounted on the upper and lower ends of the ceramic tube. The outer diameter of the explosion-proof ring is larger than the outer diameter of the ceramic tube.

10. A charging-only fuse according to claim 6, characterized in that: The outside of the ceramic tube is covered with acid-free paper.

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