Fuse, distribution box and vehicle

Abstract

The utility model provides a fuse, a distribution box and a vehicle. The connector assembly comprises a fuse link. Two ends of the fuse link are respectively connected with one conductive tab so as to realize electric connection; the container tube body is internally provided with a containing part along the axial direction, and the fuse link is arranged in the containing part of the fuse tube body; and the cooling channel is arranged on the fuse tube body, and the cooling channel is used for circulation of a cooling medium so as to cool the fuse tube body. According to the fuse provided by the invention, the cooling channel is arranged on the fuse tube body, so that the fuse link which is easy to accumulate heat can be cooled, and the fuse link is prevented from being abnormally fused due to the accumulated heat under the working condition that a circuit normally works.

Description

Technical Field

[0001] The present application relates to the technical field of circuit protection, and more specifically, to a fuse, a distribution box provided with the fuse, and a vehicle. Background Art

[0002] Fuses are also called fuses. They are usually installed in circuits as electrical components to protect the circuits. When there is an excessive current in the circuit, the fuse element in the fuse will melt due to the increase in temperature, thereby cutting off the power to the conductive circuit. At present, in the field of new energy vehicles, the circuits inside the vehicles are increasingly tending towards high current and high power. Under high-power conditions, it is easy for the circuits to melt in a fault-free state due to poor heat dissipation. In severe cases, arcing will occur, burning other components. In the current related technologies, the heat dissipation of the fuse is mainly achieved through air cooling and liquid cooling. The heat exchange efficiency of the air cooling method is very low, and the liquid cooling mainly achieves heat dissipation of the fuse element through cooling the pole ears, and the heat dissipation effect is not good. Utility Model Content

[0003] A series of simplified concepts are introduced in the utility model content section, which will be further described in detail in the detailed implementation section. The utility model content section of this application does not mean to attempt to define the key features and essential technical features of the technical solution claimed for protection, nor does it mean to attempt to determine the scope of protection of the technical solution claimed for protection.

[0004] An object of the present application is to provide a fuse that at least solves the above-mentioned problem.

[0005] Fuse link;

[0006] Two conductive electrode ears, one conductive electrode ear is connected to each end of the fuse link to achieve electrical connection;

[0007] A fuse tube body, wherein a receiving portion is axially arranged in the receiving tube body, and the fuse is arranged in the receiving portion of the fuse tube body; and

[0008] A cooling channel is provided in the fuse tube body, and is used for the circulation of a cooling medium to cool the fuse tube body.

[0009] According to the fuse of the first aspect of the present application, a cooling channel is provided on the fuse tube body. The cooling medium exchanges heat with the fuse tube body through the cooling channel, takes away excess heat from the fuse tube body, and cools the fuse tube body.

[0010] Optionally, the fuse further includes an inlet joint and an outlet joint, which are respectively connected to two ends of the cooling channel, and the circulation of the cooling medium in the cooling channel is achieved through the inlet joint and the outlet joint.

[0011] Optionally, the cooling channel includes a plurality of sub-channels, and the plurality of sub-channels are arranged in an arranged manner, and two adjacent sub-channels are interconnected. The arrangement of the plurality of sub-channels increases the heat exchange contact area and improves the heat exchange efficiency.

[0012] Optionally, two adjacent sub-channels are connected end to end at the ends to ensure smooth flow of cooling medium between the sub-channels.

[0013] Optionally, the cooling channel is integrally formed on the fuse tube body, and the corresponding cooling channel is formed when the fuse tube body is cast.

[0014] Optionally, as another embodiment of the utility model, the fuse tube body includes: an inner tube body and an outer tube body, the outer side of the inner tube body cooperates with the inner side of the outer tube body, the outer side wall of the inner tube body is provided with a first groove, and the inner side wall of the outer tube body is provided with a second groove, and the first groove and the second groove define the cooling channel.

[0015] Optionally, as yet another embodiment of the present invention, the fuse further includes a cooling tube, a cooling channel is arranged in the aforementioned cooling tube, and the cooling tube is fixed on the outer surface of the fuse tube body.

[0016] Optionally, to ensure the connection between the cooling tube and the fuse tube body, the cooling tube is provided with a first mounting portion, the outer surface of the fuse tube body is provided with a second mounting portion, and the first mounting portion and the second mounting portion are installed and matched; or the cooling tube is welded to the outer surface of the fuse tube body; or the cooling tube is bonded to the outer surface of the fuse tube body.

[0017] Optionally, in order to ensure good heat conduction effect of the cooling pipe, the cooling pipe is a metal part.

[0018] Optionally, in order to ensure good thermal conductivity of the fuse tube body, the fuse tube body is made of ceramic.

[0019] Optionally, the fuse further comprises two conductive electrode ears, each end of the fuse body is electrically connected to a conductive electrode ear, the conductive electrode ear is bent in the middle, one end of the conductive electrode ear is bolted to the fuse body, and the other end of the conductive electrode ear is provided with a through hole for connecting to the conductive copper busbar.

[0020] Optionally, the fuse further comprises an arc extinguishing member, which is arranged in a receiving portion in the fuse tube body, and a through groove is formed in the arc extinguishing member along the axial direction, and the fuse body is arranged in the through groove.

[0021] Optionally, the fuse in the fuse includes a conductive part and a fuse part, the flow area of ​​the fuse part is smaller than the conductive part, the conductive part and the fuse part are spaced apart, and both ends of the fuse are conductive parts.

[0022] According to a second aspect of the present application, a distribution box is provided, comprising a box body, a relay, and a first conductive copper bar and a second conductive copper bar arranged in the box body. A mounting hole is arranged on the box body of the distribution box, an insulating housing of a connector assembly is installed outside the box body, two ends of a fuse are electrically connected to the first conductive copper bar and the second conductive copper bar respectively, and the first conductive copper bar and the second conductive copper bar are electrically connected to the relay to form a conductive circuit.

[0023] Optionally, a third mounting portion is provided in the box body, the fuse is provided in the third mounting portion, and a buffer pad is also provided in the third mounting portion to buffer the vibration of the fuse.

[0024] According to the third aspect of the present application, a vehicle is provided, comprising a power battery, a rigid conductor and the distribution box described above, wherein a plurality of rigid conductors are respectively connected to the power battery and the distribution box, thereby ensuring a stable connection between the power battery and the distribution box and ensuring the driving safety of the vehicle.

[0025] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The following drawings of the embodiments of the present application are used as a part of the present application for understanding the present application. The drawings show the embodiments of the present application and their descriptions, which are used to explain the principle of the present application.

[0027] In the accompanying drawings,

[0028] Figure 1 is a top view of a fuse according to a preferred embodiment of the present application;

[0029] Figure 2 yes Figure 1 A cross-sectional view of the middle fuse in the top view direction;

[0030] Figure 3 yes Figure 1 A cross-sectional view of the fuse in the front view direction;

[0031] Description of Reference Numerals

[0032] 1. Fuse tube body; 11. Cooling channel; 111. Sub-channel; 112. Inlet joint; 113. Outlet joint; 2. Conductive electrode ear; 21. First conductive electrode ear; 22. Second conductive electrode ear; 3. Fuse body; 31. Conductive part; 32. Fusing part; 4. Arc extinguishing part. DETAILED DESCRIPTION

[0033] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present application. However, it is obvious to those skilled in the art that the present application embodiments can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present application embodiments, some technical features well known in the art are not described.

[0034] Herein, ordinal numbers such as “first” and “second” cited in the present application are merely identifications and do not have any other meanings, such as a specific order, etc. Moreover, for example, the term “first component” itself does not imply the existence of the “second component”, and the term “second component” itself does not imply the existence of the “first component”.

[0035] In this document, “upper”, “lower”, “front”, “back”, “left”, “right”, etc. are only used to indicate the relative position relationship between related parts, rather than to limit the absolute positions of these related parts.

[0036] In this document, “equal”, “same”, etc. are not strictly limited in a mathematical and / or geometric sense, but also include errors that can be understood by those skilled in the art and are allowed in manufacturing or use.

[0037] Unless otherwise stated, the numerical ranges herein include not only the entire range within its two endpoints but also include several sub-ranges contained therein.

[0038] like Figure 1 As shown, according to an embodiment of the utility model, the fuse of the embodiment shown includes a fuse body 1, a conductive electrode ear 2, a fuse body 3, and an arc extinguishing member 4, wherein the conductive electrode ear 2 mainly plays a conductive role, the fuse body 3 melts when the fuse reaches a high temperature to protect the circuit, the fuse body 1 mainly plays a protective role for the fuse, and the arc extinguishing member 4 mainly plays a role in preventing arcs in the fuse.

[0039] Specifically, a cooling channel 11 is provided on the fuse tube body 1 , and the cooling channel 11 is used for the circulation of a cooling medium, mainly for cooling the fuse tube body 1 .

[0040] At present, in the field of new energy vehicles, the circuits inside the vehicles are increasingly tending towards high current and high power. Under high-power conditions, it is easy for the fuse to melt in a fault-free state due to poor heat dissipation. In severe cases, arcing will occur, burning other components. In some structures of related technologies, the fuse mainly uses two methods to cool the fuse as a whole. One is air cooling: specifically, ventilation holes are provided in the fuse tube body, and a ventilation fan is provided on the outside of the fuse. The fan dissipates heat from the inside of the fuse tube body, but the heat exchange efficiency of this cooling method is low and cannot effectively achieve heat dissipation of the fuse; the other method is liquid cooling, but in related technologies, for the convenience of assembly, the liquid cooling channel is usually set on the conductive electrode ear, but the main heat-generating part inside the fuse is the fuse body, and the cooling liquid path set on the conductive electrode ear cannot effectively dissipate heat for the fuse. The difference between the utility model application and the related art is that the utility model sets a cooling channel 11 on the fuse tube body 1, which can perform targeted cooling on the internal heating fuse 2, thereby enhancing the cooling effect of the fuse, thereby effectively avoiding the problem of heat accumulation in the fuse tube body 1 and the fuse blowing under normal working conditions.

[0041] like Figure 1 As shown, further, an inlet joint 112 and an outlet joint 113 are respectively provided at the openings at both ends of the above-mentioned cooling channel 11. In order to fully illustrate the technical solution of this embodiment, the specific solution includes a water pump and a water tank not shown in the figure. The water pump passes the cooling medium in the water tank into the inlet joint 112, and then flows through the cooling channel 11 and flows out from the outlet joint 113 to realize cooling water circulation.

[0042] Furthermore, in an embodiment of the utility model, the cooling channel 11 is configured as a plurality of sub-channels 111, and the plurality of sub-channels 111 are arranged in an array. Arranging a plurality of sub-channels 111 on the fuse tube body can increase the heat exchange area and improve the heat exchange efficiency. At the same time, the plurality of sub-channels are interconnected to ensure the normal operation of the entire cooling cycle.

[0043] Furthermore, in order to ensure that the cooling water in the cooling channel 11 can flow through each sub-channel 111, the utility model application sets the ends of two adjacent sub-channels 111 to be connected end to end. When the cooling water flows from one end of the sub-channel 111 through the other end of the sub-channel 111, the cooling water will flow inside the sub-channels adjacent to the above-mentioned sub-channels due to the same beginning and end, thereby ensuring that the cooling water can flow through each sub-channel 111.

[0044] like Figure 2 As shown, further, in a preferred embodiment of the present invention, the cooling channel 11 is integrally formed on the fuse tube body 1 . Specifically, the cooling channel 11 is directly cast during the process of casting or processing the fuse tube body 1 .

[0045] Of course, the technical solution of the present invention is not limited to the above solution. As an optional second embodiment, the present invention arranges the fuse tube body as a split structure, that is, the fuse tube body is divided into an outer tube body and an inner tube body, and the inner side of the outer tube body cooperates with the outer side of the inner tube body, so that the inner tube body can be arranged inside the outer tube body, and the two can cooperate with each other; the outer side wall of the inner tube body is provided with a first groove, and the inner side wall of the outer tube body is provided with a second groove, and the first groove and the second groove are fitted through the cooperation of the outer tube body and the inner tube body, that is, the cooperation of the first groove and the second groove can define the cooling channel 11. The advantage of this embodiment is that the difficulty of processing the first groove and the second groove when processing the outer tube body and the inner tube body is much lower than the difficulty of one-piece molding, and the assembly difficulty is also relatively low.

[0046] Further, as an optional third embodiment, the utility model sets the cooling channel 11 in the cooling tube. That is, in this embodiment, the fuse also includes an independent cooling tube, and the cooling tube is a hollow pipe with a cooling channel 11 therein, and the independent cooling tube is fixed on the outer surface of the fuse tube body. Specifically, the cooling tube includes a plurality of cooling branches, and the plurality of the aforementioned cooling branches are provided with branch channels 111. The plurality of cooling branches are arranged to increase the heat exchange area between the cooling tube and the fuse tube body, thereby improving the heat exchange efficiency of the cooling tube.

[0047] Further, as an optional embodiment, the cooling tube can be fixed in various ways. Specifically, the cooling tube is provided with a first mounting portion, and the outer surface of the fuse tube body is provided with a second mounting portion, and the technical effect of fixing the cooling tube to the outer surface of the fuse tube body 1 is achieved by the installation and cooperation of the first mounting portion and the second mounting portion; similarly, the cooling tube can also be welded on the outer surface of the fuse tube body 1; or the cooling tube is bonded to the outer surface of the fuse tube body 1.

[0048] Furthermore, in order to ensure the cooling effect of the cooling pipe, the cooling pipe is a metal part. The good thermal conductivity of the metal part can achieve a better cooling effect.

[0049] Furthermore, the fuse tube body is a ceramic part, and the material of the ceramic part can be selected from the most commonly used alumina ceramic material. The thermal conductivity of alumina ceramic can be increased to 39W / mK at most, which can bring good heat transfer effect as the fuse tube body; the ceramic part can also be selected from high-purity boron nitride ceramics, aluminum nitride composite ceramics and other materials with electrical insulation, good thermal conductivity and good machinability.

[0050] Furthermore, to ensure the normal electrical connection of the entire fuse, a conductive electrode lug 2 is connected to each of the two ends of the fuse body 3. Since the electrical connection positions of the conductive electrode lugs may be different, the utility model divides the conductive electrode lugs into a first conductive electrode lug 21 and a second conductive electrode lug 22. Figure 2 As shown, the first conductive electrode lug 21 and the second conductive electrode lug 22 are respectively arranged on both sides of the fuse, and the fuse body is fixedly connected to the two conductive electrode lugs.

[0051] Furthermore, the first conductive electrode tab 21 and the second conductive electrode tab 22 are respectively provided with different mounting holes at one end to adapt to different assembly environments.

[0052] Furthermore, in order to reduce the assembly space of the conductive electrode tab 2, the first conductive electrode tab 21 and the second conductive electrode tab 22 are bent at the middle position, thereby reducing the assembly space in the vertical direction.

[0053] Furthermore, in order to better realize the assembly of the conductive electrode lug 2 and the fuse tube body 1, the utility model is provided with screw holes at both ends of the fuse tube body 1 along the axial direction, and four through holes are provided at one end of the two conductive electrode lugs 2 away from the assembly hole. Bolts can be connected with the screw holes on the fuse tube body 1 through the aforementioned through holes, thereby fixing the conductive electrode lug 2 on the fuse tube body 1.

[0054] Furthermore, in order to achieve effective arc extinguishing of the fuse, the utility model provides an arc extinguishing member 4 in the fuse tube body 1. Specifically, the arc extinguishing member 4 is arranged in a housing portion in the fuse tube body 1, and the arc extinguishing member 4 is provided with a through groove along the axial direction, and the fuse body 3 is arranged in the through groove.

[0055] Specifically, the arc extinguishing member 4 is made of high-purity quartz sand after chemical treatment. Its function is to effectively extinguish the arc and increase the breakdown voltage of the insulating layer. At the same time, its good insulation can prevent large current from breaking through the insulating layer after arcing, thereby damaging the load in the circuit.

[0056] Furthermore, if Figure 3 As shown, the structure of the fuse 3 includes a conductive part 31 and a fuse part 32. The flow area of ​​the fuse part 32 is smaller than that of the conductive part 31. When a large current flows through the fuse 3, the fuse part 32 with a small flow area generates more heat. When the temperature reaches the melting point of the fuse 3, the fuse will melt, thereby realizing the protection function of the fuse. In order to achieve a more uniform conductive effect, the utility model arranges the conductive part 31 and the fuse part 32 at intervals, and at the same time, the two ends of the fuse 3 are the conductive parts 31 to ensure a stable electrical connection. Specifically, the utility model preferably uses pure silver as the material of the fuse 3.

[0057] The utility model also provides a distribution box, comprising:

[0058] Box;

[0059] Relay;

[0060] The first conductive copper bar and the second conductive copper bar are arranged in the box.

[0061] The aforementioned fuse has two ends electrically connected to the first conductive copper bar and the second conductive copper bar respectively, and the first conductive copper bar and the second conductive copper bar are electrically connected to the relay to form a conductive loop.

[0062] Furthermore, a third mounting portion is provided in the box body, the fuse is provided in the third mounting portion, and a buffer pad is also provided in the third mounting portion to buffer the vibration of the fuse.

[0063] The utility model further provides a vehicle, comprising:

[0064] Power battery;

[0065] Rigid conductors; and

[0066] The aforementioned distribution box has multiple rigid conductor points connected to the power battery, which supplies power to the distribution box. The other end of the distribution box is connected to a DC-DC converter or other electrical appliances, and the circuit conduction inside the vehicle is controlled by a relay, thereby ensuring the stable operation of the vehicle.

[0067] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are only for illustration, not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A fuse, characterized in that: include: Fuse link; A fuse tube body, wherein a receiving portion is axially arranged in the fuse tube body, and the fuse is arranged in the receiving portion of the fuse tube body; as well as A cooling channel, the cooling channel being arranged on the fuse tube body, the cooling channel being used for the circulation of a cooling medium to cool the fuse tube body; An inlet joint and an outlet joint, wherein the inlet joint and the outlet joint are respectively connected to two ends of the cooling channel; The cooling channel includes a plurality of sub-channels, the plurality of sub-channels are arranged in an array, and two adjacent sub-channels are connected to each other.

2. The fuse according to claim 1, characterized in that: Two adjacent sub-channels are connected end to end at the ends.

3. The fuse according to claim 1, characterized in that: The cooling channel is integrally formed on the fuse tube body.

4. The fuse according to claim 1, characterized in that: The fuse tube body comprises: an inner tube body and an outer tube body, the outer side of the inner tube body cooperates with the inner side of the outer tube body, the outer side wall of the inner tube body is provided with a first groove, and the inner side wall of the outer tube body is provided with a second groove, and the first groove and the second groove define the cooling channel.

5. The fuse according to claim 1, characterized in that: Also includes: A cooling tube, wherein the cooling channel is arranged in the cooling tube, and the cooling tube is fixed on the outer surface of the fuse tube body.

6. The fuse according to claim 5, characterized in that: The cooling tube is provided with a first mounting portion, the outer surface of the fuse tube body is provided with a second mounting portion, and the first mounting portion is mounted and matched with the second mounting portion; or The cooling tube is welded to the outer surface of the fuse tube body; or The cooling tube is bonded to the outer surface of the fuse tube body.

7. The fuse according to claim 6, characterized in that: The cooling pipe is a metal part.

8. The fuse according to claim 1, characterized in that: The fuse tube body is a ceramic piece.

9. The fuse according to claim 1, characterized in that: It also includes two conductive electrode ears, each end of the fuse is electrically connected to one of the conductive electrode ears, the conductive electrode ears are bent in the middle, one end of the conductive electrode ears is bolted to the fuse tube body, and the other end of the conductive electrode ears is provided with a through hole for connecting to a conductive copper busbar.

10. The fuse according to claim 1, characterized in that: It also includes an arc extinguishing member, which is arranged in a receiving portion in the fuse tube body. A through groove is formed in the arc extinguishing member along the axial direction, and the fuse body is arranged in the through groove.

11. The fuse according to claim 1, characterized in that: The fuse comprises a conductive part and a fuse part, the flow area of ​​the fuse part is smaller than that of the conductive part, the conductive part and the fuse part are arranged at a distance, and the two ends of the fuse part are the conductive parts.

12. A distribution box, characterized in that: include: Box; Relay; A first conductive copper bar and a second conductive copper bar, wherein the first conductive copper bar and the second conductive copper bar are arranged in the box; as well as According to the fuse according to any one of claims 1 to 11, two ends of the fuse are electrically connected to the first conductive copper bar and the second conductive copper bar respectively, and the first conductive copper bar and the second conductive copper bar are electrically connected to the relay to form a conductive loop.

13. The distribution box according to claim 12, characterized in that: A third mounting portion is disposed in the box body, the fuse is disposed in the third mounting portion, and a buffer pad is also disposed in the third mounting portion to buffer the vibration of the fuse.

14. A vehicle, characterized in that: include: Power battery; Rigid conductor; as well as According to the distribution box of claim 12 or 13, a plurality of the rigid conductors are electrically connected to the power battery and the distribution box.

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