Fuse and electric equipment

Abstract

The invention relates to a fuse and electric equipment. The fuse comprises a shell, an electric connection unit, an action unit and an excitation unit. The shell is provided with a first cavity and a second cavity, and a communicating hole is formed in the cavity wall of the first cavity so that the first cavity can communicate with the second cavity. The electric connection unit is mounted on the shell and comprises a connection bar and a melt which are connected in parallel; the action unit comprises a first breaker movably installed in the first chamber and a second breaker movably installed in the second chamber. The excitation unit is mounted on the shell; wherein the excitation unit is used for driving the first disjunction device to disconnect the connecting bar, and is also used for driving the second disjunction device to disconnect the melt after the first disjunction device disconnects the connecting bar; and when the first breaking device does not cut off the connecting row, the first breaking device blocks the communicating hole. The invention aims to provide the fuse with the arc extinguishing capability and the breaking capability.

Description

Technical Field

[0001] The present application relates to the technical field of fuses, and in particular to a fuse and an electrical device. Background Art

[0002] As a critical component for current interruption, fuses automatically cut off current in power lines or electrical equipment when overload, short circuit, or undervoltage occurs. This protects the power lines or electrical equipment, preventing major safety incidents. An excitation fuse is a type of fuse that receives a control signal to trigger a protective action, actively cutting off current flow in the circuit. In today's new energy vehicle market, many electric vehicles are equipped with excitation fuses to proactively cut off the high-voltage portion of the vehicle when an internal circuit short-circuits, taking into account the risk of electrical conductivity caused by a short circuit. This ensures driving safety.

[0003] An excitation fuse receives a trigger signal, triggering an excitation source. This source releases a large amount of high-pressure gas as a driving force, which in turn drives a power unit to disconnect the conductor connected in series with the main circuit, thereby protecting the circuit. Excitation fuses offer advantages such as controlled interruption and fast response time, but they also have drawbacks. Because they interrupt in air, they interrupt low fault currents. However, when the fault current is high, the arc at the air-break is large, making it difficult to achieve post-break insulation. Summary of the Invention

[0004] The present application provides a fuse and an electrical device, aiming to provide a fuse with arc extinguishing capability and breaking capability.

[0005] In order to achieve the above object, according to a first aspect of the present application, a fuse is provided, comprising:

[0006] The housing is provided with a first chamber and a second chamber, wherein a cavity wall of the first chamber is provided with a communicating hole to connect the first chamber with the second chamber;

[0007] An electrical connection unit, mounted on the housing, comprising a connecting bar and a fuse connected in parallel;

[0008] an actuating unit comprising a first breaker movably mounted in the first chamber and a second breaker movably mounted in the second chamber; and

[0009] an excitation unit, mounted on the housing;

[0010] The excitation unit is used to drive the first breaker to disconnect the connection bar, and is also used to drive the second breaker to disconnect the fuse after the first breaker disconnects the connection bar; when the first breaker does not cut off the connection bar, the first breaker blocks the connecting hole.

[0011] Optionally, when the first disconnector cuts off the connection row, the first disconnector opens the communication hole.

[0012] Optionally, the shell includes a main body and a partition installed on the main body, the partition is provided with the first chamber, and the main body is provided with the second chamber.

[0013] Optionally, one end of the excitation unit extends into the first chamber and is located above the top of the first breaker, so as to output an excitation medium to drive the first breaker and the second breaker to move.

[0014] Optionally, the excitation unit includes an ignition device, one end of which extends into the first chamber and is located above the top of the first disconnector;

[0015] The ignition device is used to output the excitation medium to the first chamber to drive the first disconnector and the second disconnector to move.

[0016] Optionally, the connecting bar includes a first section and two second sections electrically connected to opposite ends of the first section, the first section corresponds to the first breaker, and the fuse is electrically connected to the two second sections.

[0017] Optionally, a thinned area is formed on the first segment, and the thinned area corresponds to the first disconnector.

[0018] Optionally, the connecting row is extended along the length direction of the shell, and the connecting row and the melt are arranged side by side along the width direction of the shell.

[0019] Optionally, the melt includes a first connecting section and two second connecting sections, the two second connecting sections are bent and connected at the two ends of the first connecting section opposite to each other along the length direction of the shell, and are arranged opposite to each other, the first connecting section corresponds to the second divider, and the two second connecting sections are extended along the height direction of the shell.

[0020] Optionally, at least one of the second connecting segments is fixed to the housing, and the second disconnector is fixed to the first connecting segment to break the melt.

[0021] Optionally, the second disconnector includes a first portion and a second portion, wherein the first portion passes through the first connecting section and is fixed to the second portion.

[0022] Optionally, a plurality of via holes are formed on the first connecting section;

[0023] The first part is provided with a plurality of protrusions on a side facing the first connecting section, and the plurality of protrusions correspond to the plurality of via holes. The second part is provided with a plurality of grooves on a side facing the first connecting section, and the plurality of grooves correspond to the plurality of via holes. Each of the protrusions passes through each of the via holes and is fixed in the corresponding groove.

[0024] Optionally, the electrical connection unit further includes a connecting member, which is provided on the housing and is arranged opposite to the connecting bar;

[0025] When the second disconnector does not disconnect the fuse, the two second sections of the connection bar are electrically connected to the two second connection sections of the fuse through the connecting member.

[0026] Optionally, the two second sections of the connecting row are further provided with two connecting columns extending along the height direction of the shell;

[0027] When the second breaker does not disconnect the fuse, the two second sections of the connection row are electrically connected to the two second connection sections of the fuse respectively through the two connection columns and the connection member.

[0028] Optionally, the excitation unit includes a first trigger electrode, a second trigger electrode and an ignition device, wherein the first trigger electrode and the second trigger electrode are connected to the ignition device to trigger the ignition device to output an excitation medium to the first chamber to drive the first disconnector and the second disconnector to move;

[0029] The first trigger electrode and the second trigger electrode are installed on the shell, and a short-circuit fuse for electrically connecting the first trigger electrode and the second trigger electrode is provided on the shell. A movable breaking piece is also provided on the second connecting piece, and the breaking piece is used to break the short-circuit fuse.

[0030] Optionally, a protective cover is further included, which surrounds a portion of the shell and corresponds to the excitation unit to protect the excitation unit.

[0031] Optionally, the excitation unit includes an ignition device, and the ignition device, the housing and the connecting row are relatively fixed by bolts.

[0032] According to a second aspect of the present application, an electrical device is provided, comprising the above-mentioned fuse.

[0033] Beneficial effects:

[0034] In the technical solution of the present application, the reliability of the fuse's disconnection is improved by disconnecting the connecting bar first and then the fuse, thereby improving the safety of the fuse. Specifically, the excitation unit first drives the first breaker to disconnect the connecting bar. When the first breaker cuts off the connecting bar, the melt becomes the overcurrent carrier, greatly reducing the number of free electrons in the broken gap of the connecting bar, avoiding continuous arcing in the gap. Subsequently, the excitation unit drives the second breaker to disconnect the fuse, realizing the disconnection of the entire fuse, thereby separating the arc extinguishing function and the disconnecting function, without interference between them, and improving the safety of the fuse. When the first breaker does not cut off the connecting bar, the first breaker blocks the connecting hole, so that the first chamber and the second chamber are not connected, ensuring the airtightness of the first chamber, thereby avoiding the simultaneous breaking of the connecting bar and the melt.

[0035] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0037] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same drawing numbers represent the same parts in the following description.

[0038] Figure 1 This is a structural diagram of an embodiment of a fuse provided by the present application;

[0039] Figure 2 yes Figure 1 Top view of the middle fuse;

[0040] Figure 3 yes Figure 2 Cross-sectional view of AA;

[0041] Figure 4 yes Figure 2 Cross-sectional view of the middle BB;

[0042] Figure 5 yes Figure 1 a cross-sectional view of the middle shell;

[0043] Figure 6 yes Figure 1 Schematic diagram of the coordination of the connecting piece, melt and connecting column;

[0044] Figure 7 yes Figure 1Schematic diagram of the coordination between the first breaker and the connecting bar;

[0045] Figure 8 yes Figure 1 Schematic diagram of the structure of the middle connecting piece;

[0046] Figure 9 yes Figure 1 Schematic diagram of the coordination between the second breaker and the melt;

[0047] Figure 10 yes Figure 9 sectional view of

[0048] Figure 11 yes Figure 1 Schematic diagram of the structure of the melt;

[0049] Figure 12 yes Figure 1 Side view of the fuse.

[0050] Description of reference numerals:

[0051] 100. Fuse;

[0052] 1. Housing; 11. First chamber; 12. Second chamber; 13. Partition; 131. Communication hole; 14. Main body;

[0053] 2. Electrical connection unit; 21. Connecting row; 211. First section; 2111. Thinning area; 212. Second section; 22. Melt; 221. First connecting section; 2211. Via hole; 222. Second connecting section; 23. Connector; 24. Connecting column;

[0054] 3. Action unit; 31. First breaker; 32. Second breaker; 321. First portion; 3211. Protrusion; 322. Second portion; 3221. Groove;

[0055] 4. Excitation unit; 41. Ignition device; 42. First trigger electrode; 43. Second trigger electrode; 44. Short-circuit fuse; 45. Breaking piece;

[0056] 5. Protective cover. DETAILED DESCRIPTION

[0057] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0058] An excitation fuse receives a trigger signal, triggering an excitation source. This source releases a large amount of high-pressure gas as a driving force, which in turn drives a power unit to disconnect the conductor connected in series with the main circuit, thereby protecting the circuit. Excitation fuses offer advantages such as controlled interruption and fast response time, but they also have drawbacks. Because they interrupt in air, they interrupt low fault currents. However, when the fault current is high, the arc at the air-break is large, making it difficult to achieve post-break insulation.

[0059] In view of this, the present application proposes a fuse 100, Figures 1 to 12 This is a structural schematic diagram of an embodiment of the fuse 100 provided in the present application. The fuse 100 provided in the present application has a compact structure, occupies a small space, and has breaking and arc extinguishing capabilities. The fuse 100 will be described in detail below in conjunction with the main drawings.

[0060] According to the first aspect of this application, referring to Figure 1 、 Figure 2 、 Figure 3 and Figure 4 The present application provides a fuse 100, comprising a housing 1, an electrical connection unit 2, an action unit 3 and an excitation unit 4; the electrical connection unit 2 is mounted on the housing 1, and the electrical connection unit 2 includes a connecting row 21 and a fuse 22 connected in parallel; the action unit 3 includes a first disconnector 31 movably mounted on the housing 1 and a second disconnector 32 movably mounted on the housing 1; the excitation unit 4 is mounted on the housing 1; wherein the excitation unit 4 is used to drive the first disconnector 31 to disconnect the connecting row 21, and also to drive the second disconnector 32 to disconnect the fuse 22 after the first disconnector 31 disconnects the connecting row 21.

[0061] In the technical solution of the present application, the reliability of the disconnection of the fuse 100 is improved by sequentially disconnecting the connecting bar 21 and then the fuse 22, thereby improving the safety of the fuse 100. Specifically, the activation unit 4 first drives the first disconnector 31 to disconnect the connecting bar 21. When the first disconnector 31 disconnects the connecting bar 21, the fuse 22 becomes a current carrier, greatly reducing the number of free electrons in the broken gap of the connecting bar 21 and preventing continuous arcing in the gap. Subsequently, the activation unit 4 drives the second disconnector 32 to disconnect the fuse 22, thereby disconnecting the entire fuse 100. This achieves the separation of the arc extinguishing function and the disconnection function, eliminating interference between the two functions and improving the safety of the fuse 100. When the first disconnector 31 does not disconnect the connecting bar, the first disconnector 31 blocks the communication hole, disconnecting the first chamber 11 and the second chamber 12, ensuring the airtightness of the first chamber 11, thereby preventing the connecting bar 21 and the fuse 22 from breaking simultaneously.

[0062] In some embodiments, see Figure 3 and Figure 4Fuse 100 is connected in series in the circuit. When the first breaker 31 disconnects connecting bar 21, an inductance is formed at both ends of the broken portion of connecting bar 21, creating a potential difference and generating an electromagnetic field in the gap of the broken portion. When the current through connecting bar 21 remains unchanged, the free electrons in the metal are driven by the electromagnetic field to form high-speed free electrons that collide with free metal ions and air in the gap, causing the arc to start and continue. The internal resistance in the gap of the broken portion is very large. At this time, due to the action of melt 22, melt 22 is connected in parallel to the circuit, causing a short circuit between the broken connecting bar 21 and the circuit, thereby reducing the current in the circuit, effectively preventing the arc from continuing and achieving the arc extinguishing effect. Subsequently, the second breaker 32 disconnects melt 22, and fuse 100 is completely disconnected, achieving circuit power outage and thus realizing the circuit protection function.

[0063] In this example, please continue to refer to Figure 7 By setting the first disconnector 31 and the second disconnector 32, the first disconnector 31 disconnects the connecting bar 21, and the second disconnector 32 disconnects the fuse 22, so that the disconnection of the connecting bar 21 and the fuse 22 does not interfere with each other, and the arc extinguishing function and the disconnecting function can be well separated, thereby improving the safety of the fuse 100.

[0064] In this embodiment, in order to ensure that the arc extinguishing function and the disconnecting function are separated, it is necessary to ensure that the first disconnector 31 is activated first. After the first disconnector 31 is activated, the second disconnector 32 is activated. Specifically, in actual operation, the excitation unit 4 triggers the signal to release the driving force, and the driving force drives the first disconnector 31 to move, and the first disconnector 31 disconnects the connection row 21. After the first disconnector 31 disconnects the connection row 21, the driving force drives the second disconnector 32 to move again, and the second disconnector 32 disconnects the fuse 22, thereby disconnecting the fuse 100. In this embodiment, the first disconnector 31 and the second disconnector 32 are arranged side by side, so that the actions of the first disconnector 31 and the second disconnector 32 do not interfere with each other, that is, the first disconnector 31 disconnects the connecting row 21, and the second disconnector 32 disconnects the melt 22, thereby turning a continuous action of disconnecting the connecting row 21 and the melt 22 through one structure into two relatively independent actions, which can make the delay time and the delay method more flexible, and the side-by-side arrangement is simpler and easier to implement.

[0065] In some embodiments, the shell 1 can be an upper and lower shell, a left and right shell, or an upper, middle and lower shell, and is set according to actual conditions. The material of the shell 1 is required to be insulating. The shell 1 can be injection molded or processed by other methods.

[0066] Specifically, in some embodiments, the connection bar 21 is made of a conductive material and is disposed in the housing 1 . Both ends of the connection bar 21 are used to connect to an external circuit.

[0067] See also Figure 3 and Figure 4 The shell 1 is provided with a first chamber 11 and a second chamber 12, and the first chamber 11 and the second chamber 12 are arranged side by side along the width direction of the shell 1. More specifically, the connecting row 21 is arranged through the first chamber 11, that is, part of the connecting row 21 is located in the first chamber 11, and the first disconnector 31 is movably installed in the first chamber 11, and the first disconnector 31 corresponds to the part of the connecting row 21 located in the first chamber 11. The melt 22 is provided in the second chamber 12, and the second disconnector 32 is movably installed in the second chamber 12, and the second disconnector 32 is correspondingly located at the melt 22. Furthermore, the wall of the first chamber 11 is provided with a connecting hole 131, which is used to connect the first chamber 11 and the second chamber 12. When the first disconnector 31 has not cut the connecting row 21, the first disconnector 31 blocks the connecting hole 131, allowing the driving force generated by the excitation unit 4 to be transmitted within the first chamber 11, preventing the driving force generated by the excitation unit 4 from being transmitted to the second chamber 12, thereby achieving a time delay. When the first disconnector 31 cuts the connecting row 21, the first disconnector 31 opens the connecting hole 131, allowing the driving force generated by the excitation unit 4 to be transmitted from the first chamber 11 to the second chamber 12 through the connecting hole 131, thereby driving the second disconnector 32 to move. It should be noted that, in this embodiment, the connecting hole 131 will be opened only after the first disconnector 31 disconnects the connection row 21, thereby connecting the first chamber 11 and the second chamber 12. In this way, a delay effect can be achieved, thereby realizing the sequential operation of the first disconnector 31 and the second disconnector 32, and then realizing the function of extinguishing the arc first and then cutting off the power, thereby improving the safety of the fuse 100.

[0068] There is no limitation on the arrangement of the first chamber 11 and the second chamber 12, and they can be arranged according to the actual situation. In some embodiments, a mounting cavity is formed in the housing 1, and a partition is provided in the mounting cavity to separate the mounting cavity into the first chamber 11 and the second chamber 12 which are independent of each other. A connecting hole 131 is provided on the partition wall to connect the first chamber 11 and the second chamber 12. In another embodiment, please refer to Figure 5 The shell 1 includes a main body 14 and a partition 13 installed on the main body 14. A cavity is formed in the main body 14. The partition 13 is provided in the cavity to form a first chamber 11. The chamber inside the partition 13 is the first chamber 11, and the chamber outside the partition 13 is the second chamber 12, that is, the side wall of the partition 13 separates the first chamber 11 and the second chamber 12. At the same time, a connecting hole 131 is provided on the partition 13, so that the first chamber 11 and the second chamber 12 can be connected.

[0069] In this embodiment, one end of the excitation unit 4 extends into the first chamber 11 and is located above the top of the first breaker 31. When a short circuit occurs, the excitation unit 4 triggers a signal release to output an excitation medium, which generates a driving force to drive the first breaker 31 and the second breaker 32. In this embodiment, the excitation unit 4 is connected to the first breaker 31, first driving the first breaker 31 to move, and then transmits the driving force to the second chamber 12 through the connecting hole 131, thereby driving the second breaker 32.

[0070] The specific structure of the excitation unit 4 is not limited, as long as it can achieve driving. In some embodiments, the excitation unit 4 includes an ignition device 41, and the signal receiving end of the ignition device 41 is connected to an external trigger circuit for receiving a trigger signal from the trigger circuit. One end of the ignition device 41 extends into the first chamber 11 and is located above the top of the first disconnector 31; when the excitation unit 4 triggers the signal, the ignition device 41 detonates, generating air pressure (i.e., the excitation medium), and the air pressure drives the first piston to move. The specific structure and working principle of the ignition device 41 can refer to the conventional settings in this field, and will not be repeated here.

[0071] In some embodiments, see Figure 7 and Figure 8 To facilitate connection between the fuse 100 and the circuit, both ends of the connecting bar 21 need to extend beyond the first chamber 11, thereby facilitating connection of the fuse 100 to the circuit. Specifically, the connecting bar 21 includes a first segment 211 and two second segments 212. The two second segments 212 are electrically connected to opposite ends of the first segment 211. The first segment 211 is located in the first chamber 11 and corresponds to the first disconnect 31. The two second segments 212 extend beyond the first chamber 11 at one end away from the first segment 211 for connection to the circuit.

[0072] In some embodiments, both ends of the melt 22 are electrically connected to the two second sections 212 , respectively, so that the melt 22 and the connecting bar 21 are arranged in parallel.

[0073] To facilitate disconnection of the connecting row 21 by the first disconnector 31, in this embodiment, a thinned region 2111 is formed on the first segment 211, corresponding to the first disconnector 31. It should be noted that the specific structure of the thinned region is not limited. For example, the thickness of the first segment 211 can be reduced so that it is thinner than the thickness of the second segment 212. Alternatively, the width of the first segment 211 can be reduced so that it is smaller than the width of the second segment 212. For example, a groove 3221 can be provided on the first segment 211, such that the groove 3221 directly faces the first disconnector 31. The configuration of the thinned region 2111 can be selected based on practical needs.

[0074] It should be noted that the parallel connection of the connecting bar 21 and the fuse 22 is not limited. Considering the issue of space utilization, in this embodiment, the connecting bar 21 extends along the length of the housing 1, and the connecting bar 21 and the fuse 22 are arranged side by side along the width of the housing 1. The side-by-side arrangement of the connecting bar 21 and the fuse 22 flexibly adjusts the height of the connecting bar 21, optimizes the spatial structure, and simplifies the manufacturing process. At the same time, the rational arrangement of the connecting bar 21 and the fuse 22 improves space utilization, making the fuse 100 more compact and occupying less space.

[0075] In some embodiments, see Figure 9 and Figure 10 The melt 22 is arranged in a "J" shape, which can achieve a pressure-dividing effect. Specifically, in the actual working process, when the connecting bar 21 and the melt 22 are connected in parallel, there is a problem of flow diversion between the two. In normal operation, the connecting bar 21 is the main current carrier. Therefore, the internal resistance ratio of the connecting bar 21 to the melt 22 is much greater than 1. If you want to increase the internal resistance of the melt 22, you need to extend the length of the melt 22 and also reduce the thickness of the melt 22. Due to the skin effect, reducing the thickness has its limit. Therefore, generally by extending the length of the melt 22, the resistance of the melt 22 is increased, which is beneficial to the pressure resistance of the melt 22. When the length of the melt 22 increases, the space occupied by the melt 22 increases. Therefore, within a limited space, the "J" shape arrangement design is adopted to maximize the extension of the length of the melt 22, thereby achieving the working effect of the connecting bar 21 mainly diverting the flow and the melt 22 mainly dividing the pressure.

[0076] More specifically, in some embodiments, see Figure 11 The melt 22 includes a first connecting segment 221 and two second connecting segments 222. The two second connecting segments 222 are bent and connected to opposite ends of the first connecting segment 221 along the length direction of the shell 1. The two second connecting segments 222 are located on the same side of the first connecting segment 221 and are arranged in a diffraction pattern along the height direction of the shell 1. The first connecting segment 221 and the two second connecting segments 222 form a "J"-shaped structure, thereby extending the length of the melt 22. More specifically, the first connecting segment 221 corresponds to the second disconnector 32. When the second disconnector 32 disconnects the first connecting segment 221, the two second connecting segments 222 are completely separated, thereby achieving the disconnection function.

[0077] The first connecting section 221 can be disconnected in any manner and can be directly cut off by the second disconnector 32 or pulled off by the second disconnector 32. In this embodiment, the two second connecting sections 222 are fixed to the housing 1, and the second disconnector 32 is fixed to the first connecting section 221 to pull off the fuse 22.

[0078] The specific type of the second disconnector 32 is not limited and can be selected according to actual conditions. In some embodiments, the second disconnector 32 includes a first portion 321 and a second portion 322, respectively located on opposite sides of the first connecting section 221 along the height direction of the housing 1. The first portion 321 passes through the first connecting section 221 and is fixed to the second portion 322. When the connecting hole 131 is opened, gas enters the second chamber 12 from the first chamber 11 through the connecting hole 131. When the air pressure in the second chamber 12 reaches a critical value, the air pressure pushes the first portion 321 to move, and the first portion 321 drives the second portion 322 to move. The first connecting section 221 is located between the first portion 321 and the second portion 322. The first connecting section 221 moves with the first portion 321 and the second portion 322, and is thereby pulled apart by the first portion 321 and the second portion 322.

[0079] Furthermore, in some embodiments, a plurality of through-holes 2211 are formed on the first connecting section 221. More specifically, a plurality of protrusions 3211 are provided on the side of the first portion 321 facing the first connecting section 221, corresponding to the plurality of through-holes 2211. A plurality of grooves 3221 are provided on the side of the second portion 322 facing the first connecting section 221, corresponding to the plurality of through-holes 2211. Each protrusion 3211 passes through each through-hole 2211 and is secured within a corresponding groove 3221. In this manner, the first portion 321 and the second portion 322 can be secured together. The plurality of through-holes 2211 serve to allow the plurality of protrusions 3211 to pass through and engage with the plurality of grooves 3221. Furthermore, the plurality of through-holes 2211 can reduce the structural strength of the first connecting section 221, allowing the first connecting section 221 to be smoothly severed.

[0080] In addition, the multiple grooves 3221 have another function. When the melt 22 breaks, a large number of fractures with small cross-sections can be formed on the melt 22. Compared with the fractures of the connecting row 21 with large cross-sections and small number, the fractures of the melt 22 with small cross-sections and large number can more effectively prevent the arc from continuing, thereby ensuring that the fuse 100 is efficiently and safely disconnected.

[0081] Furthermore, in some embodiments, multiple through holes 2211 are also formed on the multiple second connecting sections 222. The multiple through holes 2211 can reduce the weight of the melt 22, so that the melt 22 can be stably connected to the shell 1, avoiding deformation and fracture due to the excessive weight of the melt 22 itself.

[0082] In some embodiments, see Figure 6The electrical connection unit 2 further includes a connector 23, which is disposed on the housing 1 and opposite the connection bar 21. The connector 23 is used to connect the connection bar 21 and the fuse 22. Specifically, when the second disconnector 32 does not disconnect the fuse 22, the two second sections 212 of the connector 23 are electrically connected to the connector 23, and the two second connection sections 222 of the fuse 22 are electrically connected to the connector 23. That is, the two second sections 212 of the connection bar 21 are electrically connected to the two second connection sections 222 of the fuse 22 via the connector 23. The connection bar 21 and the fuse 22 are arranged in parallel via the connector 23.

[0083] In some embodiments, the fuse 100 further includes two connecting posts 24 extending along the height direction of the housing 1. The two second segments 212 of the connecting row 21 are respectively connected to the connecting member 23 via the two connecting posts 24. Specifically, when the second disconnector 32 does not disconnect the fuse 22, the two second segments 212 of the connecting row 21 are electrically connected to the two second connecting segments 222 of the fuse 22 via the two connecting posts 24 and the connecting member 23.

[0084] Specifically, in this embodiment, when the fuse 100 is in normal working condition, the connecting row 21 is used as the main circuit, and the two copper columns, the connecting piece 23 and the fuse 22 structure form a branch circuit, and the branch circuit is connected in parallel with the main circuit. From the arrangement point of view, a bridge-type structure is formed between the connecting row 21, the connecting piece 23 and the two connecting columns 24, which greatly improves the structural strength and impact resistance of the fuse 100. At the same time, in combination with the "J"-shaped fuse 22, the current resistance of the connecting row 21 is improved, thereby improving the current resistance and breaking performance of the fuse 100.

[0085] In some embodiments, the connecting bar 21 , the two connecting pillars 24 , the connecting piece 23 and the melt 22 are all made of conductive metal. Specifically, the connecting bar 21 , the two connecting pillars 24 , the connecting piece 23 and the melt 22 are all made of copper.

[0086] It should be noted that the fuse 100 includes multiple live components. During the installation and welding process, the assembly components are prone to small leakage currents. However, the trigger signal of the ignition device 41 is a small current of several amperes, so it is easy to cause false triggering of the fuse 100. To avoid the above situation, this embodiment avoids false triggering by short-circuiting the trigger electrode circuit. For details, please refer to Figures 1-4The excitation unit 4 includes a first trigger electrode 42, a second trigger electrode 43, and an ignition device 41. The first trigger electrode 42 and the second trigger electrode 43 are connected to the ignition device 41 to trigger the ignition device 41 to output an excitation medium to the first chamber 11, thereby driving the first and second disconnects 31 and 32 to move. The first and second trigger electrodes 42 and 43 are mounted on a connector 23. The connector 23 is provided with a short-circuit fuse 44 for electrically connecting between the first and second trigger electrodes 42 and 43. The second connector 23 is also provided with a movable breaking member 45 for breaking the short-circuit fuse 44. After the fuse 100 is installed, the short-circuit fuse 44 is disconnected by squeezing the breaking member 45, thereby ensuring the normal operation of the fuse 100.

[0087] See also Figure 12 The fuse 100 further includes a protective sleeve 5, which surrounds a portion of the housing 1 and corresponds to the excitation unit 4, for protecting the excitation unit 4. During the transportation of the fuse 100, friction may occur between components due to shaking and other reasons. Static electricity is easily generated during the friction process, which can easily cause the ignition tube to be falsely triggered. The protective sleeve 5 wraps the excitation unit 4, isolating the static electricity and preventing false triggering of the ignition tube. Furthermore, the protective sleeve 5 is an insulating protective sleeve 5, which can prevent false triggering of the ignition tube due to static friction caused by the environment during transportation.

[0088] It should be noted that in this embodiment, the ignition device 41, the housing 1, and the connecting bar 21 are relatively fixed by bolts. More specifically, the connecting member 23 is welded to the two connecting posts 24, the two connecting posts 24 are welded to the connecting bar 21, and the melt 22 is also welded to the connecting member 23.

[0089] The operation flow of the fuse 100 provided in this application is as follows:

[0090] In normal working state, the current basically only passes through the connecting bar 21 and hardly passes through the fuse 22.

[0091] When a short circuit or fault current occurs, the excitation unit 4 ignites according to the received trigger signal, the ignition device 41 explodes, and high-pressure gas is released into the first chamber 11. The high-pressure gas pushes the first breaker 31 to move, so that the first breaker 31 cuts off the connecting row 21. After the first breaker 31 cuts off the connecting row 21, the connecting hole 131 is opened, and the connecting hole 131 connects the first chamber 11 and the second chamber 12, so that the high-pressure gas in the first chamber 11 enters the second chamber 12 through the connecting hole 131. When the pressure of the high-pressure gas in the second chamber 12 reaches the threshold, the high-pressure gas pushes the second breaker 32 to move, and the second breaker 32 pulls off the fuse 22, so that the fuse 100 breaks, achieving the purpose of power off, thereby realizing a hierarchical circuit breaking.

[0092] The operation flow of the fuse 100 provided in this application is as follows:

[0093] When the first breaker 31 severs the connecting bar 21, a break forms between the two second connecting segments 222. The gap between the two second connecting segments 222 creates an inductor, resulting in a potential difference and, consequently, an electromagnetic field. While the current flowing through the gap remains constant, the electromagnetic field drives the free electrons in the metal into high-speed motion, colliding with free metal ions and air in the gap, leading to the initiation and continuation of an arc. The internal resistance of the gap is very high, and the fuse 22 short-circuits the main path where the connecting bar 21 is located, reducing the current flow in the main path and thus preventing the arc from forming, ultimately extinguishing the arc. Subsequently, the second breaker 32 severs the fuse 22, completing the disconnection function.

[0094] According to a second aspect of the present application, an electrical device is provided, comprising the aforementioned fuse 100. The electrical device has all the beneficial effects of the aforementioned fuse 100, which are not further described in this application. The electrical device includes, but is not limited to, a battery pack or a battery system.

[0095] It is understood that electrical equipment includes, but is not limited to, electric toys, power tools, electric vehicles, vehicles, ships, spacecraft, and the like. Electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft. Vehicles may include gasoline-powered vehicles, plug-in hybrid vehicles, or new energy vehicles, and this application does not impose specific limitations on this.

[0096] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0097] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0098] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0099] The above are merely preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A fuse, characterized in that: include: The housing is provided with a first chamber and a second chamber, wherein a cavity wall of the first chamber is provided with a communicating hole to connect the first chamber with the second chamber; An electrical connection unit, mounted on the housing, comprising a connecting bar and a fuse connected in parallel; an actuating unit comprising a first breaker movably mounted in the first chamber and a second breaker movably mounted in the second chamber; and an excitation unit, mounted on the housing; The excitation unit is used to drive the first breaker to disconnect the connection bar, and is also used to drive the second breaker to disconnect the fuse after the first breaker disconnects the connection bar; when the first breaker does not cut off the connection bar, the first breaker blocks the connecting hole.

2. The fuse according to claim 1, wherein: When the first disconnector cuts off the connection row, the first disconnector opens the communication hole.

3. The fuse according to claim 2, characterized in that The housing includes a main body and a partition installed on the main body, the partition is provided with the first chamber, and the main body is provided with the second chamber.

4. The fuse according to claim 2, wherein: One end of the excitation unit extends into the first chamber and is located above the top of the first breaker, so as to output an excitation medium to drive the first breaker and the second breaker to move.

5. The fuse according to claim 4, characterized in that The excitation unit includes an ignition device, one end of which extends into the first chamber and is located above the top of the first disconnector; The ignition device is used to output the excitation medium to the first chamber to drive the first disconnector and the second disconnector to move.

6. The fuse according to claim 2, wherein: The connecting bar includes a first section and two second sections electrically connected to opposite ends of the first section. The first section corresponds to the first disconnector, and the fuse is electrically connected to the two second sections.

7. The fuse according to claim 6, characterized in that A thinned area is formed on the first segment, and the thinned area corresponds to the first disconnector.

8. The fuse according to claim 6, characterized in that The connecting row is extended along the length direction of the shell, and the connecting row and the melt are arranged side by side along the width direction of the shell.

9. The fuse according to claim 6, characterized in that The melt includes a first connecting section and two second connecting sections, the two second connecting sections are bent and connected to the two ends of the first connecting section that are oppositely arranged along the length direction of the shell, and are arranged oppositely, the first connecting section corresponds to the second divider, and the two second connecting sections are extended along the height direction of the shell.

10. The fuse according to claim 9, characterized in that At least one of the second connecting segments is fixed to the housing, and the second disconnector is fixed to the first connecting segment to break the melt.

11. The fuse according to claim 10, wherein: The second disconnector includes a first portion and a second portion, wherein the first portion passes through the first connecting section and is fixed to the second portion.

12. The fuse according to claim 11, wherein: A plurality of via holes are formed on the first connecting section; The first part is provided with a plurality of protrusions on a side facing the first connecting section, and the plurality of protrusions correspond to the plurality of via holes. The second part is provided with a plurality of grooves on a side facing the first connecting section, and the plurality of grooves correspond to the plurality of via holes. Each of the protrusions passes through each of the via holes and is fixed in the corresponding groove.

13. The fuse according to claim 9, wherein: The electrical connection unit further includes a connecting member, which is provided on the housing and is arranged opposite to the connecting row; When the second disconnector does not disconnect the fuse, the two second sections of the connection bar are electrically connected to the two second connection sections of the fuse through the connecting member.

14. The fuse according to claim 13, wherein: Two connecting columns extending along the height direction of the shell are further provided on the two second sections of the connecting row; When the second breaker does not disconnect the fuse, the two second sections of the connection row are electrically connected to the two second connection sections of the fuse respectively through the two connection columns and the connection member.

15. The fuse according to claim 13, wherein: The excitation unit includes a first trigger electrode, a second trigger electrode and an ignition device, wherein the first trigger electrode and the second trigger electrode are connected to the ignition device to trigger the ignition device to output an excitation medium to the first chamber to drive the first disconnector and the second disconnector to move; The first trigger electrode and the second trigger electrode are installed on the shell, and a short-circuit fuse for electrically connecting the first trigger electrode and the second trigger electrode is provided on the shell. A movable breaking piece is also provided on the shell, and the breaking piece is used to break the short-circuit fuse.

16. The fuse according to claim 13, wherein: It also includes a protective cover, which surrounds a portion of the shell and corresponds to the excitation unit and is used to protect the excitation unit.

17. The fuse according to claim 13, wherein: The excitation unit includes an ignition device, and the ignition device, the housing and the connecting row are relatively fixed by bolts.

18. An electrical device, characterized in that: The invention comprises the fuse according to any one of claims 1 to 17.

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