Automobile fuse

Abstract

The utility model discloses an automobile fuse, which comprises a shell, end electrodes, a fuse element and a filler, the shell comprises an upper shell and a lower shell, the upper shell and the lower shell are matched with each other, a cavity structure is formed in the upper shell and the lower shell, and two sides of the shell are respectively provided with one end electrode; the end electrode is made of aluminum or aluminum alloy, the end electrode extends to the outside of the shell from the inside of the shell, the part, extending to the outside of the shell, of the end electrode is provided with a bent structure close to the surface of the shell, and the surface of the shell comprises an upper surface and a lower surface; the fusing element is arranged in the cavity structure, two ends of the fusing element are respectively connected with the two end electrodes, and the cavity structure is filled with the filler. The automobile fuse provided by the utility model has a flat and light-weight structure, can be suitable for being connected with an aluminum bar in a welding mode, and can meet the application requirements of light weight and integration of a new energy automobile.

Description

Technical Field

[0001] The utility model relates to the technical field of fuses, in particular to an automobile fuse. Background Art

[0002] At present, the application and demand for corresponding high-power circuit protection components, namely fuses, in the field of new energy vehicles are becoming more and more extensive. The rated conditions are basically above 200VDC@400A, and the breaking capacity is required to be above 200VDC@5kA. The voltage of some new energy power battery modules is as high as 800VDC, and 4 modules are connected in series. The voltage of each module is about 200VDC. In order to prevent short circuits between modules, short-circuit protection devices, namely fuses, need to be independently configured.

[0003] Currently, fuses that can meet this high power requirement are large in size. Figure 1 In the industry, such high-breaking fuses generally have tin-plated copper terminals, the thickness of the terminal 6 is 3-6mm, the shell 7 is made of melamine material, and the shape of the shell 7 is cylindrical. In order to meet the requirements of high-voltage breaking capacity, the outer diameter of the shell 7 of the fuse with this structure is 20-50mm, the shell thickness is 2-5mm, and the solid filler filled in the fuse makes the fuse itself too heavy, the space occupancy rate is also relatively high, and the manufacturing cost is high. However, the high-voltage power battery system emphasizes lightweight, low cost, modularization, and higher space utilization. The height and weight of the module connectors are strictly restricted. Therefore, the current design of fuses in the industry obviously no longer meets the use requirements of new energy vehicles.

[0004] The disclosure of the above background technology content is only used to assist in understanding the concept and technical solution of the utility model. It does not necessarily belong to the prior art of the present application, nor does it necessarily provide technical guidance. In the absence of clear evidence that the above content has been disclosed before the filing date of the present application, the above background technology should not be used to evaluate the novelty and creativity of the present application. Utility Model Content

[0005] The purpose of the utility model is to provide an automobile fuse, which adopts an aluminum terminal electrode, and the terminal electrode extends toward the bottom surface of the shell, has a flat and lightweight structure and can be suitable for connection with an aluminum busbar by welding, and can meet the lightweight and integrated application requirements of new energy vehicles.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0007] An automobile fuse comprises a shell, a terminal electrode, a fuse element and a filler, wherein:

[0008] The shell comprises an upper shell and a lower shell, the upper shell and the lower shell cooperate with each other and form a cavity structure therein, and one end electrode is respectively arranged on both sides of the shell;

[0009] The end electrode is made of aluminum or aluminum alloy, and extends from the inside of the shell to the outside of the shell. The portion of the end electrode extending outside the shell has a bending structure close to the surface of the shell, and the surface of the shell includes an upper surface and a lower surface thereof.

[0010] The fuse element is arranged in the cavity structure and two ends thereof are respectively connected to the two terminal electrodes, and the cavity structure is filled with the filler.

[0011] Further, based on any one of the technical solutions or a combination of multiple technical solutions described above, the end electrode includes a first thickness layer and a second thickness layer, the first thickness layer is arranged inside the shell, the second thickness layer is arranged outside the shell, and the thickness of the first thickness layer is greater than the thickness of the second thickness layer.

[0012] Furthermore, according to any one of the above-mentioned technical solutions or a combination of multiple technical solutions, the thickness of each part of the terminal electrode is the same.

[0013] Further, according to any one of the technical solutions or a combination of multiple technical solutions mentioned above, the thickness of the terminal electrode ranges from 1 mm to 3 mm.

[0014] Further, according to any one of the technical solutions or a combination of multiple technical solutions mentioned above, the end of the terminal electrode extending to the outside of the shell is flush with the bottom surface of the shell.

[0015] Further, based on any one of the above-mentioned technical solutions or a combination of multiple technical solutions, the material of the shell is ceramic or a flame-retardant composite substrate;

[0016] The thickness of the shell is 9 mm to 15 mm, and the thickness of the shell refers to the maximum distance from the upper surface of the upper shell to the lower surface of the lower shell;

[0017] The thickness of the fuse element is 0.05 mm to 0.3 mm.

[0018] Further, based on any one of the above-mentioned technical solutions or a combination of multiple technical solutions, the number of the fuse elements is two, wherein two ends of one of the fuse elements are respectively connected to the upper surfaces of the terminal electrodes on both sides, and two ends of the other fuse element are respectively connected to the lower surfaces of the terminal electrodes on both sides;

[0019] Furthermore, according to any one of the above-mentioned technical solutions or a combination of multiple technical solutions, the thickness of each part of the terminal electrode is the same.

[0020] Further, based on any one of the above-mentioned technical solutions or a combination of multiple technical solutions, the number of the fuse elements is 4, wherein two ends of the two fuse elements are respectively connected to the upper surfaces of the terminal electrodes on both sides, and the other two ends of the two fuse elements are respectively connected to the lower surfaces of the terminal electrodes on both sides;

[0021] The terminal electrode includes a first thickness layer and a second thickness layer, the first thickness layer is arranged inside the shell, the second thickness layer is arranged outside the shell, and the thickness of the first thickness layer is greater than the thickness of the second thickness layer.

[0022] Further, based on any one of the technical solutions or a combination of multiple technical solutions described above, arc-extinguishing bands are provided on both sides of the fuse part of the upper surface and the lower surface of the fuse element, and the extension direction of the arc-extinguishing bands intersects with the extension direction of the fuse element.

[0023] Further, based on any one of the technical solutions or a combination of multiple technical solutions mentioned above, the material of the arc-extinguishing belt is silicone rubber or silicone sealant or vulcanized silicone.

[0024] Further, based on any one of the technical solutions or a combination of multiple technical solutions mentioned above, a first through hole is arranged on the shell, and the first through hole is configured to be filled with the filler.

[0025] The beneficial effects brought by the technical solution provided by the utility model are as follows:

[0026] a. The automobile fuse provided by the utility model has a flat and lightweight structure. The terminal electrode adopts thin and lightweight aluminum material to replace the thick copper terminal of the traditional fuse. Combined with the flat rectangular shell, the weight of the fuse is only 20%-40% of the fuse with the same electrical specifications in the industry. In addition, the aluminum terminal is easy to process and bend. According to the use requirements, the terminal and the bottom of the shell can be placed in the same plane or set a certain height difference. The bending position of the terminal can also be flexibly adjusted, which is convenient for assembly and has a small space utilization rate;

[0027] b. The automobile fuse provided by the utility model adopts aluminum terminals as terminal electrodes, and has a small shell size, thin wall thickness, small inner cavity, and less internal filler. The raw material input and manufacturing cost are significantly reduced compared with traditional fuses;

[0028] c. The automobile fuse provided by the utility model adopts bent aluminum material as the terminal electrode, which can realize planar welding of the same material between the terminal electrode and the aluminum bar, and is compatible with the development trend of using aluminum bars to connect components such as power battery cells. It has significant advantages in the increasingly innovative circuit protection components of the new energy automobile industry. It replaces the traditional locking bolt method with welding, which is easier to achieve integration and can greatly improve the assembly efficiency of the fuse in application. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 The structure of the copper terminal and cylindrical fuse in the prior art;

[0031] Figure 2 A schematic top view of an automobile fuse provided for an exemplary embodiment of the utility model;

[0032] Figure 3 A schematic front view of an automobile fuse provided for an exemplary embodiment of the utility model;

[0033] Figure 4 A schematic cross-sectional view of an automotive fuse provided with a double-layer fuse element provided as an exemplary embodiment of the utility model;

[0034] Figure 5 for Figure 4 The exploded diagram of the automobile fuse is shown;

[0035] Figure 6 A cross-sectional schematic diagram of an automobile fuse provided with four layers of fuse elements is provided as an exemplary embodiment of the utility model;

[0036] Figure 7 for Figure 6 An exploded diagram of an automotive fuse is shown.

[0037] Among them, the figure marks include: 1-shell, 11-upper shell, 111-second through hole, 12-lower shell, 121-third through hole, 13-first through hole, 131-first half hole, 132-second half hole, 2-end electrode, 21-bending structure, 211-first bending portion, 212-second bending portion, 22-first thickness layer, 23-second thickness layer, 24-fourth through hole, 3-fuse element, 31-arc extinguishing belt, 4-filler, 5-fastener, 6-terminal, 7-shell. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0039] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, device, product or equipment that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0040] In addition, as a key protection device, the fuse also puts forward higher requirements for its installation method. On the one hand, it is necessary to meet the needs of integration, that is, a smaller size can carry a larger energy density and meet the high-voltage disconnection requirements; on the other hand, the connection method between battery modules has transitioned from the traditional bolt connection to the welding method. At present, the connection between the battery module cells of many manufacturers in the field of new energy vehicles has been replaced by copper bars with lighter aluminum bars or aluminum alloys, and automatic welding methods such as laser welding and ultrasonic welding are used instead of copper and copper locking bolts to meet the needs of efficient assembly. The terminal material of the traditional fuse is tin-plated on the surface of the copper substrate, and is connected to the aluminum bar by locking bolts. Regarding the connection between the battery cell and the fuse, due to the soft texture and low density of the battery module aluminum bar, the welding strength is poor, and the aluminum material is easy to deform or perforate, the existing cylindrical structure and copper tin-plated terminal large-size fuse have great limitations in weight, size and installation method. Not only its weight and size cannot meet the use requirements of new energy vehicles, but its structure and installation method are also difficult to meet the application requirements of various complex working conditions and processes of new energy vehicles.

[0041] In order to solve the deficiencies of the above-mentioned existing technologies, meet the current and future needs of safety protection of new energy power batteries, and meet the above-mentioned application requirements of lightweight, small size, high energy density, and compatibility with aluminum bar laser welding, resistance welding and other processes, this application proposes a flat, lightweight high-power fuse.

[0042] In one embodiment of the present invention, an automobile fuse is provided. Figures 1 to 7 The automobile fuse includes a shell 1, a terminal electrode 2, a fuse element 3 and a filler 4.

[0043] The housing 1 includes an upper housing 11 and a lower housing 12, which cooperate with each other and form a cavity structure therein. The housing 1 is preferably made of ceramic or other flame-retardant materials with a thermal conductivity greater than 0.4W / mK and good mechanical strength, such as a flame-retardant composite substrate, so as to achieve a good heat dissipation effect in a limited space and prevent the fuse from burning out due to excessively high temperature during long-term use. At the same time, the housing strength helps to improve the product's breaking capacity and reduce the risk of the housing blowing off or bursting.

[0044] The housing 1 is a flat structure, that is, the housing 1 is relatively thin. It should be noted that the thickness of the housing 1 refers to the maximum distance from the upper surface of the upper housing 11 to the lower surface of the lower housing 12, rather than the thickness of the upper housing 11 or the lower housing 12. The automotive fuse provided by the utility model can have a thickness of 9 mm to 15 mm while meeting the requirements of high voltage breaking capacity. Preferably, the housing 1 is in the shape of a relatively thin rectangular parallelepiped structure, such as Figures 1 to 3 The distance between the upper surface of the upper shell 11 and the lower surface of the lower shell 12 is 9 mm to 15 mm.

[0045] The shell 1 is provided with an end electrode 2 on each side. The end electrode 2 is an aluminum bar formed by bending a lightweight aluminum or aluminum alloy, and its thickness ranges from 1 mm to 3 mm. The end electrode 2 extends from the inside of the shell 1 to the outside of the shell 1, and the portion of the end electrode 2 extending outside the shell 1 has a bending structure 21 close to the upper surface or the lower surface of the shell 1. Preferably, the end of the end electrode 2 extending outside the shell 1 is flush with the bottom surface of the lower shell 12. Figure 3 and Figure 4As shown, the bending structure 21 includes a first bending portion 211 and a second bending portion 212, the first bending portion 211 is closer to the shell 1 than the second bending portion 212, the first bending portion 211 is bent in a direction close to the bottom surface of the lower shell 12, and the second bending portion 212 is bent in a direction away from or close to the lower shell 12. Through the bending structure 21 composed of the first bending portion 211 and the second bending portion 212, the end of the terminal electrode 2 extending to the outside of the shell 1 is flush with the bottom surface of the shell 1. It should be noted that in other embodiments of the present application, the end of the terminal electrode 2 extending to the outside of the shell 1 may not be flush with the bottom surface of the shell 1, and the end may also be higher or lower than the bottom surface of the shell 1, which is specifically designed according to actual needs.

[0046] In this embodiment, the aluminum bar of the terminal electrode 2 is stamped and bent so that the shell and the terminal electrode are in the same plane after assembly, or the height difference between the terminal and the bottom of the shell and the bending position of the aluminum bar can be flexibly adjusted according to actual application requirements, which can greatly save installation and use space, has strong applicability, and combined with the main structure of the flattened automotive fuse, the weight of the product (fuse) is reduced by 20-40% compared with the traditional round fuse. The aluminum bar with this structural design replaces the copper tin-plated terminal of the traditional fuse, which can achieve the same material planar welding connection with the aluminum cell of the battery module, greatly improving the reliability of the connection between the fuse and the cell under complex working conditions of the automobile, and can also better be compatible with the emerging aluminum bar welding assembly process in the new energy vehicle industry, greatly improving the assembly efficiency.

[0047] In one embodiment of the present invention, the thickness of each part of the terminal electrode 2 is the same. The advantages of this structure are low manufacturing cost and simple process.

[0048] In another embodiment of the utility model, the terminal electrode 2 is a special-shaped aluminum terminal, which includes a first thickness layer 22 and a second thickness layer 23, wherein the first thickness layer 22 is arranged inside the housing 1, and the second thickness layer 23 is arranged outside the housing 1, and the thickness of the first thickness layer 22 is greater than the thickness of the second thickness layer 23. By designing the aluminum bar inside the housing 1 as a thickened portion and the aluminum bar outside the housing 1 as a thinner portion, a fuse with a higher rated current can be prepared, and the thickened portion of the special-shaped aluminum terminal can effectively reduce the terminal impedance and increase the heat dissipation capacity of the terminal, so as to reduce the surface temperature of the product during long-term operation and prevent the current-carrying temperature from being too high and burning the melt.

[0049] In any of the above embodiments, the fuse element 3 can be a single layer or a multi-layer parallel structure. The fuse element 3 of each layer is arranged in the cavity structure and its two ends are respectively connected to the two end electrodes 2. The material of the fuse element 3 is preferably pure copper or copper-silver composite tape. The thickness of the fuse element 3 is 0.05mm to 0.3mm. Each layer of the fuse element 3 is provided with a plurality of fuse weak points in an array manner, which effectively shunts and divides the voltage, so that the energy is dispersed in the event of overcurrent or fault, and the energy that each preset weak point needs to bear is reduced by multiples, thereby greatly reducing the impact and damage to the fuse, and safely disconnecting, thereby playing an effective role in protecting the circuit.

[0050] The upper and lower surfaces of the fuse element 3 are both provided with arc extinguishing bands 31, and the extension direction of the arc extinguishing bands 31 intersects with the extension direction of the fuse element 3. Preferably, the extension direction of the arc extinguishing bands 31 is perpendicular to the extension direction of the fuse element 3. By coating the arc extinguishing bands 31 on both sides of the weak points of the front and back surfaces of the fuse element 3, an arc isolation zone is formed, which can effectively block the diffusion of metal vapor of the arc. The material of the arc extinguishing bands 31 includes one or more of silicone rubber, silicone sealant and vulcanized silicone.

[0051] The cavity structure is filled with the filler 4, and the filler 4 isolates the fuse elements 3 on the adjacent two sides. The filler 4 is a specially made multi-component granular material, including powder and adhesive. The powder is composed of one or more materials such as silicon oxide, quartz sand, magnesium hydroxide, melamine, etc. The adhesive includes a hydrated silicate bonding material and water, and the powder and the adhesive are mixed and cured at high temperature. The filler design can have a good arc extinguishing effect when the product is overcurrent or the line fails, effectively reducing the impact of the arc or metal vapor on the product, and ensuring the safe disconnection of the circuit. And the solidified filler will not loosen, avoiding the wear of the fuse element by the vibration environment. It should be noted that Figure 5 and Figure 7 The filler 4 shown in the figure is used to indicate that the filler 4 is filled inside the shell 1, and does not represent the specific structure of the filler 4. Those skilled in the art understand that the filler 4 is filled in the shell 1 and is in contact with the fuse element 3, the inner wall of the shell 1 and the terminal electrode 2.

[0052] The housing 1 is provided with a first through hole 13, and the first through hole 13 is configured to be filled with the filler 4. Figure 5 and Figure 7 As shown, the first half hole 131 disposed on the upper shell 11 and the second half hole 132 disposed on the lower shell 12 cooperate with each other to form the first through hole 13 .

[0053] In the automotive fuse with a flat shell and aluminum terminals described in the above embodiments, the fuse element 3 is connected to the terminal electrode 2 by welding, realizing a flat and lightweight three-dimensional design of a high-power automotive fuse; the interior of the fuse is a fully solid structure, with a single-layer or multi-layer fuse plus a double arc extinguishing design, and an arc extinguishing belt coated on the surface of the melt, which effectively blocks the diffusion of metal vapor of the arc, and is combined with a specially made multi-component solidified filler that can effectively absorb the arc, which can effectively solve the problem of safe disconnection of small-sized fuses under high current and high voltage.

[0054] In a specific embodiment of the present invention, a specific automobile fuse with a double-layer fuse element is provided. Figure 4 and Figure 5 In this embodiment, the shell 1 is made of ceramic with a total thickness of 9 mm; each part of the terminal electrode 2 has the same thickness of 1 mm and is made of pure aluminum. Figure 4 and Figure 5 The bending structure shown; the number of the fuse elements 3 is two, the two ends of one of the fuse elements 3 are respectively connected to the upper surfaces of the end electrodes 2 on both sides, and the two ends of the other fuse element 3 are respectively connected to the lower surfaces of the end electrodes 2 on both sides, the material of the fuse element 3 is pure copper or copper-silver composite strip, with a thickness of 0.05mm-0.3mm, and arc extinguishing strips are coated on both sides of the weak points on the front and back of each fuse element 3, such as Figure 4 and Figure 5 As shown, the fuse element 3 is connected to the terminal electrode 2 by laser welding, ultrasonic welding or resistance welding; the upper and lower parts of the shell and the welded fuse + terminal are bonded and riveted with adhesives and fasteners 5 such as rivets, as shown in FIG. Figure 5 As shown, the upper shell 11, the lower shell 12 and the terminal electrode 2 are respectively designed with a second through hole 111, a third through hole 121 and a fourth through hole 24 for the fastener 5 to pass through. After riveting, the terminal and the bottom of the shell are in the same plane and the bending directions of the terminals on both sides are consistent. The special filler 4 is filled and vibrated from the first through hole 13 on the side of the shell. After adding an adhesive, the filler powder is cured at high temperature, and finally the first through hole is sealed. The rated specifications of the automotive fuse of this design can produce a fuse with a maximum rated current of 500A, and the breaking capacity can reach 250VDC@6kA.

[0055] In a specific embodiment of the present invention, a specific automotive fuse with four-layer fuse elements is provided. Figure 6 and Figure 7In this embodiment, the material of the shell 1 is a flame-retardant composite substrate with a total thickness of 15 mm; the terminal electrode 2 is a special-shaped structure with a thick inner layer and a thin outer layer, which includes a first thickness layer 22 and a second thickness layer 23. The first thickness layer 22 is arranged inside the shell 1 and has a thickness of 3 mm. The second thickness layer 23 is arranged outside the shell 1 and has a thickness of 1 mm. Figure 6 and Figure 7 The bending structure shown; the number of the fuse elements 3 is four, wherein the two ends of the two fuse elements 3 are respectively connected to the upper surfaces of the end electrodes 2 on both sides, and the two ends of the other two fuse elements 3 are respectively connected to the lower surfaces of the end electrodes 2 on both sides, and the material of the fuse element 3 is pure copper or copper-silver composite strip, with a thickness of 0.05mm-0.3mm, and arc extinguishing strips are coated on both sides of the weak points on the front and back of each fuse element 3, such as Figure 6 and Figure 7 As shown, the fuse element 3 is connected to the terminal electrode 2 by laser welding, ultrasonic welding or resistance welding; the upper and lower parts of the shell and the welded fuse + terminal are bonded and riveted with adhesives and fasteners 5 such as rivets, as shown in FIG. Figure 7 As shown, the upper shell 11, the lower shell 12 and the terminal electrode 2 are respectively designed with a second through hole 111, a third through hole 121 and a fourth through hole 24 for the fastener 5 to pass through. After riveting, the terminal and the bottom of the shell are in the same plane and the bending directions of the terminals on both sides are consistent. The filler 4 is filled and vibrated from the first through hole 13 on the side of the shell. After adding an adhesive, the filler powder is cured at high temperature, and finally the first through hole is sealed. The rated specifications of the automotive fuse of this design can produce a fuse with a maximum rated current of 600A, and the breaking capacity can reach 250VDC@10kA.

[0056] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0057] The above is only a specific implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. An automotive fuse, characterized in that: It comprises a shell (1), a terminal electrode (2), a fuse element (3) and a filler (4), wherein: The shell (1) comprises an upper shell (11) and a lower shell (12), wherein the upper shell (11) and the lower shell (12) cooperate with each other and form a cavity structure therein, and one end electrode (2) is respectively provided on both sides of the shell (1); The material of the end electrode (2) is aluminum or an aluminum alloy, the end electrode (2) extends from the inside of the shell (1) to the outside of the shell (1), and the portion of the end electrode (2) extending outside the shell (1) has a bending structure (21) close to the surface of the shell (1); The fuse element (3) is arranged in the cavity structure and its two ends are respectively connected to the two terminal electrodes (2); the cavity structure is filled with the filler (4).

2. The automotive fuse according to claim 1, characterized in that: The terminal electrode (2) comprises a first thickness layer (22) and a second thickness layer (23), wherein the first thickness layer (22) is arranged inside the shell (1), and the second thickness layer (23) is arranged outside the shell (1), and the thickness of the first thickness layer (22) is greater than the thickness of the second thickness layer (23).

3. The automotive fuse according to claim 1, characterized in that: The thickness of each part of the terminal electrode (2) is the same.

4. The automotive fuse according to claim 2 or 3, characterized in that: The thickness of the terminal electrode (2) ranges from 1 mm to 3 mm.

5. The automotive fuse according to claim 1, characterized in that: The end of the terminal electrode (2) extending to the outside of the shell (1) is flush with the surface of the shell (1).

6. The automotive fuse according to claim 1, characterized in that: The material of the shell (1) is ceramic or a flame-retardant composite substrate; The thickness of the shell (1) is 9 mm to 15 mm; The thickness of the fuse element (3) is 0.05 mm to 0.3 mm.

7. The automotive fuse according to claim 1, characterized in that: The number of the fuse elements (3) is two, wherein two ends of one of the fuse elements (3) are respectively connected to the upper surfaces of the terminal electrodes (2) on both sides, and two ends of the other fuse element (3) are respectively connected to the lower surfaces of the terminal electrodes (2) on both sides; The thickness of each part of the terminal electrode (2) is the same.

8. The automotive fuse according to claim 1, characterized in that: The number of the fuse elements (3) is four, wherein two ends of two of the fuse elements (3) are respectively connected to the upper surfaces of the terminal electrodes (2) on both sides, and the two ends of the other two fuse elements (3) are respectively connected to the lower surfaces of the terminal electrodes (2) on both sides; The terminal electrode (2) comprises a first thickness layer (22) and a second thickness layer (23), wherein the first thickness layer (22) is arranged inside the shell (1), and the second thickness layer (23) is arranged outside the shell (1), and the thickness of the first thickness layer (22) is greater than the thickness of the second thickness layer (23).

9. The automotive fuse according to claim 1, characterized in that: Arc extinguishing bands (31) are provided on both sides of the fuse portion of the upper surface and the lower surface of the fuse element (3), and the extension direction of the arc extinguishing band (31) intersects with the extension direction of the fuse element (3).

10. The automotive fuse according to claim 9, characterized in that: The material of the arc extinguishing belt (31) is silicone rubber or silicone sealant or vulcanized silicone.

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