A modular excitation fuse

Abstract

A modular excitation fuse, comprising a housing, a conductive member is passed through the housing, and both ends of the conductive member located outside the housing can be connected to an external circuit; a piston and an electronic ignition device are arranged in the housing, and the electronic ignition device can drive the piston to cut off the conductive member; at least two conductive member connection ends are arranged at intervals on one side or both sides of the conductive member located in the housing; at least one auxiliary module is connected between the conductive member connection ends in series or parallel, and the auxiliary module is located outside the housing. For the excitation fuse of the present invention, by connecting different specifications of auxiliary modules in series or parallel outside, the breaking capacity of the excitation fuse is changed, and a series of products with breaking capacity are formed to meet the requirements of different occasions.

Description

Technical Field

[0001] The present invention relates to the fields of power control and electric vehicles, and in particular to an excitation fuse that can select a corresponding auxiliary module according to the breaking capacity. Background Art

[0002] At present, in addition to traditional thermal fuses, there already exists a structure for quickly cutting off a conductive member, namely an excitation fuse, in electric vehicle battery pack protection devices, and its application range is gradually expanding. Its main purpose is to overcome the deficiencies of traditional fuses, such as large heat generation, high power consumption, large volume and weight, limited anti-current impact ability, long breaking time, and uncontrolled breaking process. The general structure of an excitation fuse consists of an electronic ignition device, a piston, a conductive member with a pre-breaking port, and a housing. The electronic ignition device receives an excitation signal to drive the piston to disconnect the pre-breaking port on the conductive member to disconnect the circuit for protection. Compared with traditional thermal fuses, the excitation fuse has a fast response speed and disconnects the circuit according to the excitation signal, so the applicable fault range is wide. However, the excitation fuse still has some defects. First, since the structure of each excitation fuse is fixed, its breaking capacity is also fixed. When different breaking capacities are required, the excitation fuse needs to be replaced to solve the breaking capacity problem. Second, the electrical principles that can be achieved are single. Third, it is impossible to form a series of products, the specification installation dimensions are inconsistent, and they cannot be replaced and used; fourth, multiple models coexist, the materials are numerous, and the production organization is difficult. Summary of the Invention

[0003] The object of the present invention is to provide a modular excitation fuse that can form a modular excitation fuse by combining an excitation fuse structure with parallel or series auxiliary modules, realize a series of excitation fuse products, and only need to replace the auxiliary module to solve various breaking capacity problems. It reduces the problem of numerous materials of many components in the production process, is more suitable for standardized production, reduces production costs, and improves production efficiency.

[0004] To achieve the above technical object, the technical solution provided by the present invention is a modular excitation fuse, including a housing, a conductive member is disposed through the housing, and both ends of the conductive member located outside the housing can be connected to an external circuit; a piston and an electronic ignition device are disposed in the housing, and the electronic ignition device can drive the piston to cut off the conductive member; at least two conductive member connection ends are disposed at intervals on one side or both sides of the conductive member located in the housing; at least one auxiliary module is connected in series or parallel between the conductive member connection ends, and the auxiliary module is located outside the housing.

[0005] Preferably, at least one breaking weak point that can be cut off by the impact of the piston is provided on the conductive member, and the conductive member connection ends are provided on the conductive member on both sides of at least one breaking weak point; the auxiliary module is connected in parallel with at least one conductive connection end on both sides of one breaking weak point.

[0006] Preferably, the conductive member includes an independent and non-connected first conductive member and a second conductive member. One end of the first conductive member and the second conductive member is located outside the housing and can be connected to an external circuit, and the other ends are respectively located inside the housing; at least one break-weakening point is provided on the first conductive member or the second conductive member; conductive member connection ends are respectively provided on the first conductive member and the second conductive member located inside the housing, and both ends of the auxiliary module are respectively connected to the first conductive member connection end and the second conductive member connection end to connect the first conductive member and the second conductive member in series connection and be connected in series with at least one of the break-weakening points.

[0007] Preferably, at least one auxiliary function component is provided in the auxiliary module, and both ends of the auxiliary function component are electrically connected to the conductive member connection end.

[0008] Preferably, the auxiliary function component is one or a combination of a fuse, a varistor or a TVS diode.

[0009] Preferably, the auxiliary module includes a module housing, an auxiliary function component provided in the module housing, and a cover plate for sealing the module housing; both ends of the auxiliary function component are electrically connected to module connection terminals, and the module connection terminals are electrically connected to the conductive member connection ends.

[0010] Preferably, the auxiliary function component and the module connection terminal can be fixedly connected by a welding method, a screw crimping, a conductive adhesive bonding method or a snap connection method.

[0011] Preferably, when the auxiliary function component is a fuse, an arc extinguishing medium is filled around the fuse in the module housing.

[0012] Preferably, the structures of the conductive member connection end and the module connection terminal are a pluggable conductive connection structure, a snap conductive connection structure or a structure with a hollow connection part that match each other; when it is a structure with a hollow connection part, they can be electrically connected through a connecting member.

[0013] Preferably, the structure of the conductive connection end is a columnar structure, a pin structure or a spring piece structure, a hook or a snap structure with a hollow connection part; the structure of the module connection terminal is a columnar structure, a spring piece structure or a pin structure, a snap or a hook structure with a hollow connection part that matches the structure of the conductive member connection end and can be electrically connected to each other.

[0014] Preferably, an insulating backing plate is provided between the module housing and the cover plate. One end of the module connection terminal passes through the cover plate and is located outside the cover plate, and the other end is located on the insulating backing plate and is fixed by pressing through the cover plate; the auxiliary functional components pass through the insulating backing plate and are connected to the module connection terminal.

[0015] Preferably, the module connection terminal has an inverted T-shaped structure. One end of the base of its inverted T-shaped structure is located on the insulating backing plate and is fixed by pressing through the cover plate and is connected to the auxiliary functional components, and the other end passes through the cover plate and is located outside the cover plate; at the end located outside the cover plate, a columnar structure, a shrapnel structure or a pin structure, a buckle or a hook structure having a hollow connection part that is matched with the connection end structure of the conductive part and can be conductively connected to each other is provided; when there is a hollow connection part at the end located outside the cover plate and the connecting piece is a screw, an internal thread is provided in the hollow connection part.

[0016] Preferably, the piston has at least one cutting punch; when there are two or more cutting punches, the distances of the cutting punches from the conductive part are the same or different.

[0017] The modular excitation fuse of the present invention is produced by standardization itself and has a certain breaking capacity. By connecting independent auxiliary modules in parallel or in series outside the excitation fuse produced by standardization, according to the breaking capacity required in actual use, the auxiliary modules are connected in parallel or in series to the conductive parts on the excitation fuse in a connection manner that can improve the breaking capacity, so as to change the breaking capacity of the excitation fuse. By connecting different specifications of auxiliary modules in a modular manner, not only can a circuit form that improves the arc extinguishing capacity and breaking capacity be formed, but also a circuit form with other functions can be formed. It can form a series of modular products, with a wider application range, and can quickly and effectively match the requirements. It simplifies the production process, reduces the types of materials, improves the production efficiency, improves the reliability, and reduces the cost.

[0018] The auxiliary module integrating auxiliary functional components such as fuses, varistors or TVS diodes has multiple specification series such as 500V 10KA, 500V 16KA, 500V 20KA, 1000V 10KA, 1000V 16KA, 1000V 20KA, etc. Its fixing and connection methods are the same only with differences in height, and it can match different application scenarios. Through the combination of two conductive parts (with and without break points), multiple wiring methods and multiple arc extinguishing accessories, multiple different electrical principles can be realized, making the protection range and function series. Description of the Drawings

[0019] Figure 1 is a schematic diagram of the principle structure of parallel auxiliary arc extinguishing for the excitation fuse.

[0020] Figure 2 , is a schematic structural diagram of the principle of parallel-connected auxiliary arc extinguishing for an excitation fuse.

[0021] Figure 3 , is a schematic structural diagram of the conductive part of the present invention.

[0022] Figure 4 , is a schematic structural diagram of the conductive part of the present invention.

[0023] Figure 5 , is a schematic external structure diagram of the auxiliary module of the present invention.

[0024] Figure 6 , is a schematic top view structural diagram between the conductive part and the auxiliary module of the present invention. The A-A section is the section between the two ends where the conductive part is connected to the parallel melt.

[0025] Figure 7 , is Figure 6 Schematic structural diagram of the A-A section in

[0026] Figure 8 , is a schematic top view structural diagram between the conductive part and the auxiliary module of the present invention. The B-B section is the section between the two ends where the conductive part is connected to the parallel melt.

[0027] Figure 9 , is Figure 8 Schematic structural diagram of the B-B section in

[0028] Figure 10 , is a schematic top view structural diagram where the connection end of the conductive part of the present invention is a pin structure and the module connection terminal is a kind of elastic sheet structure. The C-C section is the section between the two ends where the conductive part is connected to the parallel melt.

[0029] Figure 11 , Figure 10 Schematic structural diagram of the C-C section in

[0030] Figure 12 , is Figure 11 Schematic enlarged partial structural diagram between the connection end of the conductive part and the module connection terminal in

[0031] Figure 13 , is a schematic parallel connection structure diagram of the conductive part and the melt.

[0032] Figure 14 , is a schematic structural diagram of the principle of connecting an auxiliary functional component in series at a break formed on the conductive part.

[0033] Figure 15 , is a circuit schematic diagram of several connection methods of connecting the auxiliary functional component in series or parallel on the conductive part, where F is the melt, RV is the varistor, and TVS is the diode. Detailed implementation mode

[0034] For the above technical solution, preferred embodiments are now given and described in detail with reference to the drawings.

[0035] The excitation fuse, refer to Figure 1 and Figure 2 , includes a housing. In this embodiment, the housing includes an upper housing 100 and a lower housing 101. The housing can also be composed of a left housing and a right housing, or other structures convenient for assembly. A conductive member 200 is arranged between the upper housing and the lower housing. A cavity is formed in the upper housing. In the cavity of the upper housing above the conductive member, a piston 102 and an electronic ignition device 103 are sequentially arranged from bottom to top. The electronic ignition device 103 can be connected to an external control system, receive an external excitation signal to ignite and release high-pressure gas, so as to drive the piston to move and cut off the conductive member. A cutting punch is arranged on the piston, which is used to cut off the conductive member to disconnect the circuit for circuit protection.

[0036] A cavity 104 for the bent movement of the disconnected part after the conductive member is disconnected is formed in the lower housing 101. When the conductive member is disconnected by the piston, the disconnected part can be bent and fall into the cavity 104 in the lower housing under the impact of the piston.

[0037] The conductive member 200, refer to Figure 3 , at least two disconnection weak points 201 are formed on the part of the conductive member located inside the housing. A rotation weak point 204 is formed on the conductive member at a certain distance from one side of the disconnection weak point. At least one pre-fracture 202 is formed on the conductive member between the disconnection weak point 201 and the rotation weak point 204. The disconnection weak point is a groove formed in the width direction of the conductive member, a row of through holes arranged at intervals, a structure formed by overlapping or welding two independent conductive members to form a disconnection weak point, or other structures that can reduce the disconnection strength. The rotation weak point is a groove formed in the width direction of the conductive member. When the cutting punch of the piston impacts the disconnection weak point, the conductive member is disconnected from the disconnection weak point, and then the disconnected part rotates and slides down along the rotation weak point under the action of the piston, and the pre-fracture forms a fracture under the action of the piston.

[0038] On one side or both sides of the conductive member on both sides of each pre-fracture, conductive member connection ends 203 are respectively arranged. The conductive member connection ends 203 are formed by extending from both sides of the conductive member. The conductive member connection ends are hollow cylindrical structures. The conductive member connection ends can also be set as solid cylindrical structures or solid conical columnar structures according to needs, refer to Figure 4, it is a connecting end 210 of a conductive part with a conical columnar structure. The purpose of setting a pre-fracture on the conductive part is to facilitate the piston to break the conductive part. When the thickness of the conductive part is relatively thin, no weakening part for breaking is set on the conductive part. Only the connecting ends of the conductive part need to be set at intervals on one side or both sides of the conductive part, and the parts that do not need to be broken are supported by the inner support part of the housing. A cavity is set in the displacement direction of the part to be broken, and then the part of the conductive part located in the cavity of the housing is cut off by the high-speed displacement of the piston.

[0039] Through holes are opened at the positions corresponding to the connecting ends of the conductive part on the lower housing 101, and the connecting ends of the conductive part are arranged in the through holes on the lower housing. The upper end of the through hole accommodates the connecting end of the conductive part, and when connecting the auxiliary module, the lower end of the through hole is used to accommodate the module connecting terminal of the auxiliary module. With such a structure, after the auxiliary module is connected, the overall height of the excitation fuse can be shortened. It can also be set that the through hole on the housing completely accommodates the connecting end of the conductive part.

[0040] The number and height settings of the piston cutting punches of the excitation fuse are related to the number of pre-fractures on the conductive part, the sequence and time difference of pre-fracture cutting. For example, Figure 1 in, two pre-fractures are set on the conductive part, and two cutting punches with the same height are arranged on the piston corresponding to the two pre-fractures; for example Figure 2 as shown, two cutting punches with different heights are arranged on the piston corresponding to the two pre-fractures.

[0041] Auxiliary module 300, see Figures 5 to 12, including a module housing 301, on which a cover plate 302 for sealing is provided. A limiting step is provided on the inner wall of the opening end of the module housing 301, and a backing plate 303 is provided on the limiting step, and the cover plate 302 is provided on the backing plate 303. The module housing, the cover plate and the backing plate are all made of insulating materials. Conductive module connection terminals 305 are respectively provided at the positions of the two conductive connection ends 203 of the cover plate corresponding to the diagonal of the conductive member. Fixing connection holes 309 for fixing the auxiliary module are provided at the other two corners of the auxiliary module where the module connection terminals 305 are not provided, and the connection holes 309 can correspond to the positions of the conductive connection ends of the conductive member that do not need to be connected to the module connection terminals. The upper end of the module connection terminal 305 protrudes above the cover plate. The module connection terminal 305 is made of conductive metal material, and its outer shape is a T-shaped structure, the bottom is a base, and a cylindrical structure is provided on the base to form a T-shaped structure. A cylindrical hollow part is provided on the cylindrical structure above the base, and an internal thread is provided in the hollow part. A through hole with a limiting step is provided on the backing plate corresponding to the position of the module connection terminal 305. The base part of the module connection terminal 305 is located in the through hole on the backing plate and is limited by the limiting step in the through hole; then the module connection terminal is fixed on the backing plate through the cover plate. The base of the module connection terminal 305 seals the through hole of the backing plate. The module connection terminal can also be other structural forms, such as a spring clip structure, which is convenient for the insertion of the connection end of the conductive member; it can also be a cylindrical structure or a conical cylindrical structure that can be inserted into the connection end of the conductive member, etc. In short, the structural shape of the connection end of the conductive member and the structural shape of the module connection terminal satisfy a mutually conductive connection structure that is matched. For example, a plug-in structure, a pin spring structure, a conductive buckle structure, a structure with a hollow connection part connected by a bolt, etc.

[0042] Auxiliary function components 306 are provided in the module housing. The auxiliary function components can be a fuse, a varistor or a TVS diode. The fuse is connected to the circuit to play a current limiting role, and the varistor and the TVS diode are connected to the circuit to play a voltage limiting role. In this embodiment, the auxiliary function component is a fuse 306. Both ends of the fuse 306 are fixedly connected to the bottom of two of the module connection terminals 305; the fixed connection is generally by welding, and can also be fixed by other methods such as conductive adhesive bonding or snap connection. An arc extinguishing medium is filled in the module housing where the fuse is provided. It is also possible to determine the number of fuses, the number of module connection terminals and the connection method between the fuse and the module connection terminal according to the number of pre-break points on the conductive member for energizing the fuse, the number of connection ends of the conductive member and the number of parallel fuses.

[0043] During assembly, refer to Figures 6 to 7, connect the module connection terminals 305 on the auxiliary module, which are connected to both ends of the auxiliary functional component, to the corresponding conductive component connection ends 203 on the conductive component according to both ends of the auxiliary functional component required to be connected in parallel on the conductive component: specifically, insert the module connection terminal into the through hole where the conductive component connection end at the bottom of the excitation fuse is located, and then conductively connect and fix the conductive component connection end to the module connection terminal on the auxiliary module through the conductive bolt 307; pass screws or rivets through the other two conductive component connection ends and connect them to the insulating connection holes 309 on the auxiliary module to fix the auxiliary module on the excitation fuse. Figure 6 and Figure 7 The assembly method of the auxiliary module and the conductive component, that is, the connection method between the two conductive component connection ends and the module connection terminals of the auxiliary module in the A-A section reflects Figure 1 the connection method in, that is, a auxiliary module is connected in parallel between two pre-break points. In order to achieve Figure 2 the connection method in, only need to Figure 6 and Figure 7 rotate the auxiliary module assembled in by 90 degrees, then the assembly method as in Figure 8 and Figure 9 can be achieved, that is, the connection method between the two conductive component connection ends and the module connection terminals of the auxiliary module in the B-B section reflects Figure 2 the connection method in, that is, a auxiliary module is connected in parallel between one pre-break point, so that the auxiliary functional component is connected in parallel with one pre-break point and in series with the other pre-break point.

[0044] When the conductive component connection end is a pin-shaped structure with a cylindrical or conical columnar shape, the specific structural shape of the conductive component connection end 210 refers to Figure 4 ; the module connection terminal 310 of the auxiliary module has a T-shaped structure, refer to Figures 10 to 12 , its upper end is composed of a circle of conductive elastic sheets 311, and the hollow part formed by the surrounding of the conductive elastic sheets is for the conductive component connection end to insert. In order to better connect with the conductive component connection end and maintain good conductive contact, a circle of convex ribs 312 is provided on the inner side wall of the upper end of the conductive elastic sheet of the module connection terminal. When the auxiliary module is assembled with the excitation fuse, the conductive component connection end is inserted into the hollow part formed by the conductive elastic sheet on the auxiliary module connection terminal, and the conductive elastic sheet is in close contact with the conductive component connection end to achieve conductive contact connection. The auxiliary module is fixedly installed on the lower housing of the excitation fuse through screws or rivets.

[0045] The auxiliary module can also be connected in series on the conductive component. When connected in series on the conductive component, the auxiliary functional component is a fuse element. Form a break point and at least one pre-break point on the conductive component, and connect the auxiliary functional component in the auxiliary module in series at both ends of the break point of the conductive component to form a series connection method with the conductive component. Specifically refer to Figure 14, the conductive member includes an independent and non-connected first conductive member 401 and a second conductive member 402, and a break is formed between the first conductive member and the second conductive member. One ends of the first conductive member and the second conductive member located outside the housing can be connected to an external circuit, and the other ends are respectively located inside the housing. At least one break-weakening portion is provided on the first conductive member or the second conductive member. In Figure 14 , a break-weakening portion 403 is provided on the second conductive member 402; conductive member connection ends (not shown in Figure 14 ) are respectively provided on the first conductive member and the second conductive member located inside the housing. Both ends of the auxiliary functional component in the auxiliary module are respectively connected to the first conductive member connection end and the second conductive member connection end, so as to connect the first conductive member and the second conductive member at the break in a series connection manner and be connected in series with the break-weakening portion.

[0046] The auxiliary functional components in the auxiliary module are connected in parallel or in series at the required connection points of the conductive members of the excitation fuse as needed. Figure 15 FIGS. are circuit schematic diagrams of several connection methods between the auxiliary functional component and the pre-break 202 on the conductive member or the break on the conductive member. Circuit schematic diagrams of other connection methods will not be exemplified. A, B, and C are Figure 1 circuit schematic diagrams of the connection method between the auxiliary functional component and the pre-break of the conductive member in Figure 2 , D, E, and F are Figure 14 circuit schematic diagrams of the connection between the auxiliary functional component (specifically the fuse element) and the break and pre-break of the conductive member in

[0047] The working principle of the auxiliary module of the present invention: When the auxiliary functional component is connected in parallel with one pre-break on the conductive member and in series with another pre-break, for example Figure 15 the DEG circuit schematic diagram in

[0048] When the pre-break in parallel with the auxiliary functional component is disconnected to form a first break, and when the auxiliary functional component in parallel is a fuse element, most of the fault current passes through the fuse element, and the fuse element limits the current and extinguishes the arc. When the auxiliary functional component is a varistor or a TVS diode, the voltage sensitivity and high impedance non-conductivity of the two are used to limit the voltage and extinguish the arc. Subsequently, a second break is formed on the pre-break of the conductive member not in parallel with the auxiliary functional component, and the arc is extinguished through the combined action of the second break and the auxiliary functional component. Figure 15Circuit schematic diagram of the ABC connection method; the piston forms one break or two breaks on the conductive part, disconnecting the conductive part. The auxiliary functional components in parallel play a current-limiting and arc-extinguishing role when they are fuses, and play a voltage-limiting role when they are varistors or TVS diodes. They jointly extinguish the arc with the breaks on the conductive part. When there are more breaks formed on the conductive part, the arc-extinguishing effect is better.

[0049] When one break and at least one pre-break are formed on the conductive part, the auxiliary functional component is connected in series at the break. For example Figure 15 Circuit schematic diagram of the H connection method in [reference], forming a series connection method with the whole conductive part. When a fault current occurs, the fuse first melts to limit the current. Subsequently, the pre-break on the conductive part is disconnected by the piston to form a break on the conductive part. The arc generated by the melting of the fuse and the arc generated at the break of the conductive part cause the resistance in the main circuit to continuously increase until it is insufficient to conduct current, and the arc extinguishes, disconnecting the circuit.

[0050] As can be seen from the above, regardless of how the auxiliary module is connected in parallel with the pre-break of the conductive part, it can weaken the arc generated at the disconnection between the conductive part and the auxiliary functional component by reducing the fault current or voltage, making arc extinguishing easier and improving the breaking capacity of the incentive fuse.

Claims

1. A modular excitation fuse, comprising a housing, a conductive member is passed through the housing, and both ends of the conductive member located outside the housing can be connected to an external circuit; a piston and an electronic ignition device are arranged in the housing, and the electronic ignition device can drive the piston to cut off the conductive member; It is characterized in that At least two conductive member connection ends integrally connected to the conductive member are arranged at intervals on one side or both sides of the conductive member located inside the housing; through holes are opened at positions corresponding to the conductive member connection ends at one end of the housing far from the piston, and the conductive member connection ends are arranged in the through holes; at least one auxiliary module is connected between the conductive member connection ends in series or parallel, and the auxiliary module is located outside the housing; the auxiliary module includes a module housing, auxiliary functional components arranged in the module housing, and a cover plate sealing the module housing; both ends of the auxiliary functional components are respectively conductively connected to module connection terminals, and one end of the module connection terminals not connected to the auxiliary functional components protrudes from the cover plate, and the module connection terminals extend into the through holes and are conductively connected to the conductive member connection ends; the conductive member connection ends and the module connection terminals are of a pluggable conductive connection structure, a snap conductive connection structure or a structure with a hollow connection part that are matched in structural shape; when it is a structure with a hollow connection part, it can be conductively connected through a connecting member.

2. The modular excitation fuse according to claim 1, It is characterized in that At least one breakage weak point that can cut off the conductive member when impacted by the piston is arranged on the conductive member, and the conductive member connection ends are arranged on the conductive member on both sides of at least one breakage weak point; the auxiliary module is connected in parallel with at least the conductive member connection ends on both sides of one breakage weak point.

3. The modular excitation fuse according to claim 1, It is characterized in that The conductive member includes an independent and non-connected first conductive member and a second conductive member. One end of the first conductive member and the second conductive member is located outside the housing and can be connected to an external circuit, and the other end of each is located inside the housing; at least one breakage weak point is arranged on the first conductive member or the second conductive member; the conductive member connection ends are respectively arranged on the first conductive member and the second conductive member located inside the housing, and both ends of the auxiliary module are respectively connected to the first conductive member connection end and the second conductive member connection end to connect the first conductive member and the second conductive member in series and be connected in series with at least one breakage weak point.

4. The modular excitation fuse according to any one of claims 1 to 3, It is characterized in that At least one auxiliary functional component is arranged in the auxiliary module, and both ends of the auxiliary functional component are respectively conductively connected to the conductive member connection ends.

5. The modular excitation fuse according to claim 4, It is characterized in that The auxiliary functional component is one or a combination of a fuse, a varistor or a TVS diode.

6. The modular excitation fuse according to claim 1, It is characterized in that The auxiliary functional components and the connection terminals of the auxiliary module can be fixedly connected by welding, screw crimping, conductive adhesive bonding or snap connection.

7. The modular excitation fuse according to claim 1, characterized in that when the auxiliary functional component is a fuse element, an arc extinguishing medium is filled around the fuse element in the module housing.

8. The modular excitation fuse according to claim 1, characterized in that the structure of the conductive part connection end is a columnar structure with a hollow connection part, a pin structure, a spring piece structure, a hook or a snap structure; the structure of the module connection terminal is a columnar structure with a hollow connection part, a spring piece structure or a pin structure, a snap or a hook structure that is matched with the conductive part connection end structure and can be conductively connected to each other.

9. The modular excitation fuse according to claim 8, characterized in that an insulating backing plate is provided between the module housing and the cover plate, one end of the module connection terminal passes through the cover plate and is located outside the cover plate, and the other end is located on the insulating backing plate and is fixed by pressing with the cover plate; the auxiliary functional component passes through the insulating backing plate and is connected to the module connection terminal.

10. The modular excitation fuse according to claim 9, characterized in that the module connection terminal is of an inverted T-shaped structure, one end of the base of the inverted T-shaped structure is located on the insulating backing plate and is fixed by pressing with the cover plate, and is connected to the auxiliary functional component, and the other end passes through the cover plate and is located outside the cover plate; a columnar structure with a hollow connection part, a spring piece structure or a pin structure, a snap or a hook structure that is matched with the conductive part connection end structure and can be conductively connected to each other is provided at one end located outside the cover plate; when a hollow connection part is provided at one end located outside the cover plate and the connecting piece is a screw, an internal thread is provided in the hollow connection part.

11. The modular excitation fuse according to claim 1, characterized in that the piston has at least one cutting punch; when there are two or more cutting punches, the distances of the cutting punches from the conductive part are the same or different.

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