Fuse adopting mechanical connection mode and electric automobile with fuse

Abstract

The utility model relates to a fuse used for adopting a mechanical connection mode and an electric automobile with the fuse. The fuse comprises a fusion tube, a fuse wire and a fuse wire, the melt comprises a fusible section and a pair of connecting sections which are respectively positioned on two axial sides of the fusible section and are bent relative to the fusible section; the pair of wiring terminals are respectively arranged at the axial end parts of the fusion tube, each wiring terminal is integrally manufactured and comprises a connecting part and a wiring part extending out from the axial outer surface of the connecting part, and the connecting part of each wiring terminal is in radial pin joint with the inner circumference of the corresponding axial end part of the fusion tube; a riveting part opposite to the adjacent connecting section of the melt is arranged on the axial inner surface of the connecting part of each wiring terminal; and the at least one pair of riveting pieces are respectively connected to the riveting parts of the pair of wiring terminals in a split manner or integrally connected to the riveting parts of the pair of wiring terminals, and the end part, at least far away from the corresponding riveting part, of each riveting piece can be plastically deformed outwards in the radial direction under the action of external axial force, so that the pair of connecting sections of the melt are respectively pressed to the riveting parts of the pair of wiring terminals.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit protection devices for electric power or electric vehicles, in particular to a fuse adopting a mechanical connection method and an electric vehicle with the fuse. Background Art

[0002] As the global energy crisis intensifies and environmental pollution becomes increasingly serious, electric vehicles have developed rapidly due to their advantages of zero emissions, high efficiency and low noise. Electric vehicles use power batteries to provide electricity, and then use the electronic control system to distribute the electricity to various electrical devices to drive the vehicle. In order to protect the safe operation of electric vehicles, fuses must be installed in the vehicle circuit to protect the entire vehicle from short circuits or overloads.

[0003] However, the fuse element and the terminal block of the prior art fuse are usually made of the same material, such as copper, and connected by welding, which results in the problem of high cost and heavy weight of the fuse, which in turn leads to the defect that the fuse is difficult to be used in electric vehicles. If the fuse element and the terminal block are made of different materials, there is a risk of unreliable connection during welding due to the different melting points of the different materials.

[0004] Therefore, there is a need in the art for a fuse that is low in cost, light in weight, safe and reliable. Utility Model Content

[0005] The utility model aims to provide a fuse adopting a mechanical connection method which can at least solve part of the above problems.

[0006] The utility model also aims to provide an electric vehicle using the improved fuse.

[0007] According to one aspect of the utility model, a fuse adopting a mechanical connection method is provided, the fuse comprising: a fuse tube, which is constructed as a cylindrical structure extending in the axial direction; a fuse extending in the axial direction in the fuse tube, the fuse comprising a fusible section and a pair of connecting sections respectively located on both sides of the fusible section in the axial direction and bent relative to the fusible section; a pair of wiring terminals, which are respectively mounted on the axial ends of the fuse tube, each wiring terminal is integrally formed and comprises a connecting portion and a wiring portion extending from the axial outer surface of the connecting portion, the connecting portion of each wiring terminal is radially pinned to the inner periphery of the corresponding axial end of the fuse tube, and a riveted portion opposite to the adjacent connecting section of the fuse is provided on the axial inner surface of the connecting portion of each wiring terminal; at least a pair of rivets, which are respectively separately connected to or integrally connected to the riveted portions of the pair of wiring terminals, and at least the end of each rivet away from the riveted portion can be plastically deformed radially outward under the action of an external axial force, so as to respectively press the pair of connecting sections of the fuse to the riveted portions of the pair of wiring terminals.

[0008] Compared with the prior art, the terminal connected to the fuse tube by radial pins can be prevented from moving and rotating relative to the fuse tube, and the fuse connected to the terminal by riveting can be prevented from moving and rotating relative to the terminal, thereby mechanically assembling the fuse, which allows the fuse of the utility model to be applicable to the scene where the fuse and the terminal are made of the same or different metals. In particular, the rivet is plastically deformed under the action of the axial force and presses the connecting section of the fuse to the terminal, which can ensure reliable contact between the fuse and the terminal.

[0009] Preferably, the riveted portion of each connecting portion is constructed as a riveted groove formed inwardly relative to the axial inner surface of the connecting portion, and the at least one pair of riveted parts are separately connected to the riveted grooves of the pair of connecting terminals and can be plastically deformed radially outward under the action of external axial force, so that the pair of riveted parts are respectively close to the circumferential sides of the corresponding riveted grooves.

[0010] Preferably, the pair of connecting sections of the melt are respectively embedded in the riveting grooves of the pair of connecting terminals and are respectively clamped between the riveting grooves of the pair of connecting terminals and the adjacent riveted pieces that have been plastically deformed.

[0011] Preferably, the riveted portion of each connecting portion is constructed as a preset riveted surface divided from the axial inner surface of the connecting portion, the at least one pair of riveted parts respectively extend and protrude integrally from the preset riveted surfaces of the pair of terminal blocks, and the end of the riveted part away from the connecting portion can be plastically deformed radially outward under the action of an external axial force.

[0012] Preferably, each of the pair of connecting sections of the melt is provided with a connecting hole penetrating in the axial direction and suitable for the adjacent riveted parts to pass therethrough.

[0013] Preferably, the sections of the at least one pair of rivets passing through adjacent connecting holes can be plastically deformed radially outward under the action of external axial force to clamp the pair of connecting sections of the melt between the riveted parts of the pair of connecting terminals and the plastically deformed sections of the adjacent rivets.

[0014] Preferably, the connecting hole on the melt is configured as a round hole or a square hole.

[0015] Preferably, the melt is made of copper, and the pair of connecting terminals are respectively an integral part made of magnesium-aluminum alloy.

[0016] Preferably, the fuse also includes two groups of pins that respectively connect the axial ends of the fuse tube to the corresponding connecting parts, each group of pins is arranged at intervals along the circumferential side of the corresponding axial end of the fuse tube, and a single pin radially passes through the axial end of the fuse tube and is penetrated to the periphery of the corresponding connecting part, and knurling is provided on the outer surface of the single pin.

[0017] According to another aspect of the utility model, an electric vehicle is provided, and the electric vehicle includes the aforementioned fuse adopting a mechanical connection method.

[0018] Some of the other features and advantages of the present invention will be apparent to those skilled in the art after reading this application, and the other parts will be described in the following specific embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The embodiments of the present invention are described in detail below with reference to the accompanying drawings, wherein:

[0020] Figure 1 It is an exploded view of a fuse adopting a mechanical connection method according to the utility model;

[0021] Figure 2 It is a three-dimensional view of the fuse with the mechanical connection mode according to the utility model after the fuse tube is removed.

[0022] Description of reference numerals:

[0023] 100-fuse; 10-fusible tube; 20-melt; 21-fusible section; 211-base; 212-bending part; 22-connecting section; 221-connecting hole; 30-connecting terminal; 31-connecting part; 32-connecting part; 321-connecting hole; 40-rivet; 50-pin; 51-knurling. DETAILED DESCRIPTION

[0024] Now, with reference to the accompanying drawings, a schematic scheme of the fuse using a mechanical connection method disclosed in the utility model is described in detail. Although the drawings are provided to present some embodiments of the utility model, the drawings do not have to be drawn according to the dimensions of the specific embodiments, and certain features can be enlarged, removed or partially cut to better illustrate and explain the disclosure of the utility model. Some components in the drawings can be adjusted in position 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 to describe the drawings below, such as "inside", "outside", "above", "below" and other directional terms, will be understood to have their normal meanings and refer to those directions involved when the drawings are normally viewed. Unless otherwise specified, the directional terms described in this specification are basically in accordance with the conventional directions understood by those skilled in the art.

[0026] The terms "first", "first", "second", "second" and the like used in the present invention do not indicate any order, quantity or importance, but are used to distinguish one component from other components.

[0027] The terms "joining", "connection" and the like as used in the present invention include both that two components are indirectly connected together by means of an intermediate layer such as an adhesive, a welding agent, etc. or an intermediate piece such as a connector, a transition piece, etc., and that two components are directly connected together without the aid of any intermediate layer such as an adhesive, a welding agent, etc. or an intermediate piece such as a connector, a transition piece, etc.

[0028] Figure 1 to Figure 2 The fuse 100 of the utility model using a mechanical connection method is shown by way of example. The various structural components of the fuse 100 in this example are mechanically assembled together, which ensures the reliability of mechanical and electrical connections while avoiding cracks and pores that may be generated in conventional welding methods, and reduces the requirements for construction personnel.

[0029] In such Figure 1 In the first embodiment shown, the fuse 100 may include a fuse tube 10 , a fuse element 20 , a pair of connection terminals 30 and at least a pair of rivets 40 .

[0030] Specifically, the melting tube 10 can be constructed as a cylindrical structure made of insulating materials such as plastic or melamine and extending in the axial direction, and the melt 20 made of conductive material extends in the axial direction in the melting tube 10, so that when a pair of wiring terminals 30 are respectively installed at the axial ends of the melting tube 10, they can be connected to the axial ends of the melt 20 by corresponding rivets 40. Thus, when a pair of wiring terminals 30 are connected to the protected circuit in the electric vehicle, the melt 20 can be connected in series to the protected circuit to protect the protected circuit. In the illustrated embodiment, six pieces of melt 20 are arranged relative to each other in the melting tube 10. In an embodiment not shown, the number of melts 20 in the melting tube 10 can be adjusted as needed according to the applicable scenario of the fuse 100. In an embodiment not shown, the melting tube 10 can also be constructed as a square cylinder structure extending in the axial direction.

[0031] The melt 20 can be divided into a substantially central fusible section 21 and a pair of connecting sections 22 located on both sides of the fusible section 21 in the axial direction. The fusible section 21 may include a base 211, a plurality of narrow diameters arranged axially at intervals on the base 211, and a bending portion 212 located between adjacent narrow diameters. The bending portion 212 on the fusible section 21 can not only increase the space between adjacent melts 20, but also allow the axial length of the melt 20 to change, so as to facilitate subsequent construction personnel to perform riveting operations on the melt 20 and the terminal 30. The connecting section 22 can be radially bent relative to the base 211 extending in the axial direction, so that the connecting section 22 can be arranged in contact with the axial inner surface of the connecting portion 31, especially in contact with the riveting portion on the axial inner surface of the connecting portion 31, thereby effectively increasing the contact area between the melt 20 and the terminal 30 after riveting.

[0032] The terminal block 30 is made of a single material, so that the assembly of the fuse 100 in the present invention basically includes two steps: connection between the fuse 20 and the terminal block 30, and connection between the terminal block 30 and the fuse 20. The terminal block 30 may include a connection portion 31 and a connection portion 32 extending from the axial outer surface of the connection portion 31, and the connection portion 32 may be provided with a connection hole 321 for connection with an external circuit.

[0033] In the illustrated embodiment, a portion of the axial inner surface of the connecting portion 31 is divided into a preset riveting surface, and the riveting piece 40 integrally extends and protrudes from the preset riveting surface of the connecting portion 31. Exemplarily, the riveting piece 40 can be integrally molded with the terminal 30, which can further simplify the assembly steps of the fuse 100 provided by the utility model.

[0034] The connecting section 22 of the fuse 20 is provided with a connecting hole 221 that penetrates in the axial direction, and the shape and size of the connecting hole 221 can be designed so that the rivet 40 can just pass through it. In the illustrated embodiment, the connecting section 22 of the fuse 20 is provided with three connecting holes 221, and the shape of the connecting holes 221 is designed as a circular hole. Accordingly, three rivet members 40 can be provided on the preset riveting plane opposite to the connecting section 22 of the fuse 20, and the rivet members 40 can be designed as a cylinder. In an embodiment not shown, the number and shape of the connecting holes 221 on the fuse 20 can be adjusted as needed according to the applicable scenario of the fuse 100. For example, the connecting holes 221 of the fuse 20 can be designed as other numbers and configured as square holes, and the rivet members 40 can be correspondingly designed as the same number of quadrangular prisms.

[0035] During assembly, the connecting sections 22 at both axial ends of the melt 20 are respectively sleeved to the rivets 40 on the adjacent connecting portion 31 through the connecting holes 221 thereon, and the connecting sections 22 at both axial ends of the melt 20 can be abutted against the axial inner surface of the connecting portion 31. The external riveting tool can apply an axial force to the section of the rivet 40 passing through the connecting hole 221 of the melt 20, so as to force the rivet 40 to plastically deform radially outward to extend beyond the periphery of the connecting hole 221 of the melt 20, so that the connecting section 22 of the melt 20 can be clamped between the plastically deformed section of the rivet 40 and the preset riveting surface of the terminal 30, and the connecting section 22 of the melt 20 can be in close contact with the preset riveting surface of the terminal 30. After riveting multiple pieces of the melt 20 to the terminal 30 in sequence, the connecting portion 31 of the terminal 30 is placed on the inner periphery of the corresponding axial end of the melt 20 and the terminal 30 is radially pinned to the inner periphery of the melt 20. Thus, the assembly of the fuse 100 provided by the present invention is basically completed, and other sand filling operations and sand filling hole sealing operations are not the focus of the present invention, and thus will not be described in detail here.

[0036] During use, the force on the fuse 100 mainly comes from the force applied to the wiring portion 32 by the external cable. The terminal 30 radially pinned to the fuse tube 10 can be prevented from moving and rotating relative to the fuse tube 10, and the fuse 20 riveted to the terminal 30 by means of the rivet 40 can be prevented from moving and rotating relative to the terminal 30. In particular, the rivet 40 plastically deforms under the action of the axial force and presses the connecting section 22 of the fuse 20 to the terminal 30, which can ensure reliable contact between the fuse 20 and the terminal 30.

[0037] Optionally, the fuse 20 may be made of copper, and the terminal 30 is an integral piece made of a magnesium-aluminum alloy. The magnesium-aluminum alloy has electrical conductivity, thermal conductivity, and mechanical properties close to those of copper, and its density is approximately one-third of that of copper, thereby effectively reducing the weight and cost of the fuse 100 provided by the utility model.

[0038] In an embodiment not shown, the riveted portion of the connecting portion 31 is configured as a riveted groove formed by being concave relative to the axial inner surface thereof, and the cross-sectional shape of the riveted groove may be the same as the shape of the connecting section 22 of the melt 20, so that the connecting section 22 of the melt 20 may be embedded in the adjacent riveted groove. For example, the riveted groove may be designed as a rectangular groove, and the connecting section 22 of the melt 20 may be designed as follows: Figure 1 Rectangular shape shown.

[0039] The riveting piece 40 can be designed as a riveting block that can be detachably connected to the riveting groove. The shape of the riveting block can be designed to be the same as the cross-sectional shape of the riveting groove, so that after the connecting section 22 of the melt 20 is placed in the corresponding riveting groove, the riveting block can be placed in the riveting groove where the connecting section 22 of the melt 20 is arranged, and an axial force is applied to the riveting block with the help of an external riveting tool, so that the riveting block is plastically deformed radially outward to the circumference of the corresponding riveting groove, thereby clamping the connecting section 22 of the melt 20 between the plastically deformed riveting block and the riveting groove of the terminal 30. Preferably, the axial inner surface of the plastically deformed riveting block is substantially flush with the axial inner surface of the connecting portion 31 where it is located.

[0040] Optionally, in the illustrated embodiment, the fuse 100 may further include two groups of pins 50 to respectively connect the axial ends of the fusion tube 10 to the corresponding connection parts 31. Each group of pins 50 includes four pins 50 arranged at intervals along the circumferential side of the fusion tube 10. The outer peripheral surfaces of the axial ends of a single pin 50 may be provided with knurling 51, so that when the single pin 50 is radially passed through the axial end of the fusion tube 10 and penetrated to the periphery of the connection part 31, the knurling 51 on the axial ends of the single pin 50 is respectively matched and connected to the connection part 31 and the fusion tube 10, so as to improve the connection reliability between the fusion tube 10 and the terminal 30.

[0041] It is understandable that only the "axial direction of the pin 50" herein refers to the axial direction of the pin 50, and the "axial direction" and "radial direction" described elsewhere refer to the axial direction and radial direction of the fuse tube 10. In an embodiment not shown, the number of pins 50 in each group can be adjusted as needed according to the applicable scenario of the fuse 100.

[0042] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0043] The above description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes, modifications and combinations made by any technician in the field without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A fuse (100) using a mechanical connection method, characterized in that: The fuse (100) comprises: The melting tube (10) is constructed as a cylindrical structure extending in the axial direction; A melt (20) extending axially in the melt tube (10), the melt (20) comprising a fusible section (21) and a pair of connecting sections (22) respectively located on both sides of the fusible section (21) in the axial direction and bent relative to the fusible section (21); A pair of connecting terminals (30) are respectively mounted on the axial ends of the melting tube (10), each connecting terminal (30) is integrally formed and comprises a connecting portion (31) and a connecting portion (32) extending from the axial outer surface of the connecting portion (31), the connecting portion (31) of each connecting terminal (30) is radially pinned to the inner periphery of the corresponding axial end of the melting tube (10), and a riveting portion opposite to the adjacent connecting section (22) of the melting body (20) is provided on the axial inner surface of the connecting portion (31) of each connecting terminal (30); At least one pair of riveted parts (40) are separately connected to or integrally connected to the riveted parts of the pair of connecting terminals (30), and at least the end of each riveted part (40) away from the riveted part can be plastically deformed radially outward under the action of an external axial force, thereby pressing a pair of connecting sections (22) of the melt (20) to the riveted parts of the pair of connecting terminals (30).

2. The fuse (100) using a mechanical connection method according to claim 1, characterized in that: The riveted portion of each connecting portion (31) is constructed as a riveted groove formed inwardly relative to the axial inner surface of the connecting portion (31), and the at least one pair of riveted parts (40) are separately connected to the riveted grooves of the pair of connecting terminals (30) and can be plastically deformed radially outward under the action of an external axial force, so that the pair of riveted parts (40) are respectively close to the circumferential side of the corresponding riveted grooves.

3. The fuse (100) using a mechanical connection method according to claim 2, characterized in that: A pair of connecting sections (22) of the melt (20) are respectively embedded in the riveting grooves of the pair of connecting terminals (30) and are respectively clamped between the riveting grooves of the pair of connecting terminals (30) and the adjacent riveted parts (40) that have been plastically deformed.

4. The fuse (100) using a mechanical connection method according to claim 1, characterized in that: The riveted portion of each connecting portion (31) is constructed as a preset riveted surface divided from the axial inner surface of the connecting portion (31), the at least one pair of riveted pieces (40) respectively extend and protrude integrally from the preset riveted surfaces of the pair of connecting terminals (30), and the end of the riveted piece (40) away from the connecting portion (31) can be plastically deformed radially outward under the action of an external axial force.

5. The fuse (100) using a mechanical connection method according to claim 4, characterized in that: A pair of connecting sections (22) of the melt (20) are each provided with a connecting hole (221) penetrating in the axial direction and suitable for an adjacent riveting piece (40) to pass through.

6. The fuse (100) using a mechanical connection method according to claim 5, characterized in that: The sections of the at least one pair of rivet members (40) passing through the adjacent connecting holes (221) can be plastically deformed radially outward under the action of an external axial force, so as to clamp a pair of connecting sections (22) of the melt (20) respectively between the riveted locations of the pair of connecting terminals (30) and the plastically deformed sections of the adjacent rivet members (40).

7. The mechanically connected fuse (100) according to claim 5, characterized in that: The connecting hole (221) on the melt (20) is configured as a round hole or a square hole.

8. The fuse (100) using a mechanical connection method according to any one of claims 1 to 7, characterized in that: The melt (20) is made of copper, and the pair of connection terminals (30) are each an integral piece made of a magnesium-aluminum alloy.

9. The fuse (100) using a mechanical connection method according to claim 1, characterized in that: The fuse (100) further comprises two groups of pins (50) respectively connecting the axial ends of the fusion tube (10) to the corresponding connecting parts (31), each group of pins (50) being arranged at intervals along the circumference of the corresponding axial end of the fusion tube (10), and a single pin (50) radially passes through the axial end of the fusion tube (10) and is penetrated to the circumference of the corresponding connecting part (31), and a knurling (51) is provided on the outer surface of the single pin (50).

10. An electric vehicle, characterized in that: The electric vehicle comprises a fuse (100) using a mechanical connection method according to any one of claims 1 to 9.

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