High-reliability over-current and over-temperature fuse

Abstract

The utility model relates to the technical field of fuses, in particular to a high-reliability over-current and over-temperature fuse, which comprises a shell, a sealing element and an electrode plate, a fusible core is arranged in the shell, the sealing element is arranged in the shell, and the electrode plate is connected with the fusible core; according to the fuse, the sealing element is arranged in the shell, the fusible core and the first pressure relief component are isolated, particulate matter and pollutants in air are prevented from entering the shell along the first pressure relief component, the situation that the fusible core is not completely broken due to the particulate matter or the pollutants is avoided, and therefore the purpose of improving the breaking effect of the fuse is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of fuses, in particular to a high-reliability over-current and over-temperature fuse. Background Art

[0002] Fuses (protectors) need to have strong breaking capacity to ensure that the equipment will melt quickly and cut off the circuit quickly in the event of overcurrent, thereby avoiding safety accidents. If the breaking capacity is insufficient, continuous arcing is likely to occur during breaking, resulting in serious consequences such as burning circuits or even large-scale fires.

[0003] During the fusing process, fuses will generate fusing gas. In order to improve the breaking capacity of fuses, a pressure relief channel is often provided on the fuse housing in the current market to discharge the gas generated during the fusing process along the pressure relief channel. For example, Chinese patent CN115206747A discloses a fuse housing for safe exhaust, in which a labyrinth wall is designed on the housing for guiding and exhausting. However, under normal use, particulate matter and pollutants in the air can easily enter the fuse along the pressure relief channel, which may cause the fuse to be incompletely disconnected, affecting the function and safety of the fuse.

[0004] It should be noted that the information disclosed in this background technology section is only intended to increase the understanding of the overall background of the utility model, and should not be regarded as an admission or suggestion in any form that the information constitutes prior art already known to a person skilled in the art. Utility Model Content

[0005] In order to solve the technical problem that the particles and pollutants in the air easily enter the fuse along the pressure relief channel, affecting the function and safety of the fuse, the utility model provides a high-reliability overcurrent and overtemperature fuse, which includes a shell, a seal and an electrode sheet. A fuse core is arranged in the shell. The seal is arranged in the shell.

[0006] The electrode sheet comprises a first electrode sheet and a second electrode sheet, the first electrode sheet and / or the second electrode sheet are provided with a through hole, the first electrode sheet and the second electrode sheet are respectively located at two ends of the shell and extend into the shell to be connected to the fuse;

[0007] Wherein, a first pressure relief component is arranged on the shell, a first breakthrough point is provided at a position on the seal corresponding to the pressure relief component, and a top view orthographic projection of the through hole covers the first breakthrough point.

[0008] Furthermore, the fusible core is a low-melting-point fusible core with a melting point temperature of less than 232°C.

[0009] Further, the setting position of the first breakthrough point corresponds to the position of the through hole.

[0010] Further, the housing includes a bottom case and a top case, the seal includes a first seal and a second seal, the first seal is disposed within the bottom case, the second seal is disposed within the top case, the first pressure relief member is disposed on the bottom case, and a first breaking point is provided at a position on the first seal corresponding to the first pressure relief member.

[0011] Further, a partition is provided on the top case, and there are two partitions respectively located on both sides of the fuse core.

[0012] Further, a second pressure relief member is provided on the top case, and a second breaking point is provided at a position on the second seal corresponding to the second pressure relief member.

[0013] Further, both the first pressure relief member and the second pressure relief member are two. The two first pressure relief members are respectively disposed at both ends of the bottom case, and the two second pressure relief members are respectively disposed at both ends of the top case. The number of the first breaking points and the second breaking points is equal to the number of the first pressure relief members and the second pressure relief members, and their setting positions correspond to each other.

[0014] Further, the first breaking point and the second breaking point are weak points or cut surfaces on the first seal and the second seal.

[0015] Further, both the first pressure relief member and the second pressure relief member include a pressure relief channel. The pressure relief channel includes an opposite front part and a tail part. The front part of the pressure relief channel is adjacent to the first seal or the second seal, and the tail part of the pressure relief channel penetrates through the bottom case or the top case to form an exhaust hole;

[0016] The pressure relief channel is provided with a stepped portion, and the front part and the tail part of the pressure relief channel are respectively located on the lower surface and the upper surface of the stepped portion.

[0017] Further, the front part of the pressure relief channel is a "V"-shaped channel.

[0018] Further, a baffle is provided between the exhaust hole and the stepped portion.

[0019] Further, an air flow groove is formed between the exhaust hole and the stepped portion.

[0020] Based on the above, a highly reliable over-current and over-temperature fuse provided by the present utility model, compared with the prior art, by providing a seal within the housing to isolate the fuse core and the first pressure relief member, blocking particulate matter and pollutants in the air from entering the housing along the first pressure relief member, and avoiding the situation that the fuse core is not completely broken due to particulate matter or pollutants, thereby achieving the purpose of improving the breaking effect of the fuse. Brief Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. In the following description of the positional relationship of the drawings, unless otherwise specified, it is based on the direction in which the components are shown in the drawings.

[0022] Figure 1 Explosion structure schematic diagram of a high-reliability overcurrent and over-temperature fuse provided by an embodiment of the present invention;

[0023] Figure 2 Structure schematic diagram of a first seal provided by an embodiment of the present invention;

[0024] Figure 3 Structure schematic diagram of a bottom shell provided by an embodiment of the present invention;

[0025] Figure 4 Structure schematic diagram of a top shell provided by an embodiment of the present invention;

[0026] Figure 5 For Figure 3 Partial enlarged structure schematic diagram at position N in

[0027] Figure 6 Structure schematic diagram of a bottom shell provided by another embodiment of the present invention;

[0028] Figure 7 For Figure 6 Partial enlarged structure schematic diagram at position M in

[0029] Reference Signs:

[0030] 10 - Housing 20 - Seal 30 - Electrode Plate

[0031] 40 - Fuse Core 50 - First Pressure Relief Member 60 - First Break Point

[0032] 70 - Partition 80 - Second Pressure Relief Member 90 - Second Break Point

[0033] 100 - Through Hole 110 - Pressure Relief Channel 120 - Exhaust Hole

[0034] 130 - Step Portion 140 - Baffle 150 - Air Flow Groove

[0035] 160 - Connector 11 - Bottom Shell 12 - Top Shell

[0036] 21 - First seal 22 - Second seal 31 - First electrode sheet

[0037] 32 - Second electrode sheet Detailed implementation manner

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0039] In the description of the present utility model, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more. Additionally, the term "comprising" and any variations thereof mean "including at least".

[0040] Please refer to Figure 1 and Figure 2 , Figure 1 which is a schematic explosion structure diagram of a high - reliability over - current and over - temperature fuse provided by an embodiment of the present utility model; Figure 2 which is a schematic structure diagram of the first seal provided by an embodiment of the present utility model.

[0041] To solve the technical problem that particulate matters and pollutants in the air easily enter the fuse along the pressure - relief channel, affecting the function and use safety of the fuse, or to achieve at least one of the above - mentioned advantages or other advantages, an embodiment of the present utility model provides a high - reliability over - current and over - temperature fuse. As shown in the figure, the high - reliability over - current and over - temperature fuse includes a housing 10, a seal 20, and an electrode sheet 30. The housing 10 has a cavity therein, and a fuse core 40 is disposed in the cavity.

[0042] The fuse core 40 can be a low-melting-point fuse core. Specifically, the melting point temperature of the fuse core 40 is lower than 232 °C to achieve the effect of double protection against overcurrent and overheating. When the fuse has an overcurrent or overheating situation, the fuse core 40 can be quickly disconnected under the action of the auxiliary fusing agent, thereby cutting off the overall current circuit and protecting the safety of the circuit and avoiding the occurrence of safety accidents.

[0043] The seal 20 is arranged in the cavity inside the housing 10. Specifically, it is attached to the inner side wall of the housing 10. In specific implementation, a first pressure relief member 50 is arranged on the housing 10 for discharging the gas generated when the fuse core 40 melts out of the housing 10 to improve the breaking capacity of the overall fuse.

[0044] There is a first breakthrough point 60 at the position of the seal 20 corresponding to the first pressure relief member 50. Specifically, the first breakthrough point 60 is a weak point at the position of the seal 20 corresponding to the first pressure relief member 50. Of course, in some other embodiments, the seal 20 can be a complete seal formed by two seal components joined end to end, and the joint of the two seal components is the weak point.

[0045] Under normal conditions, the first breakthrough point isolates the fuse core 40 and the first pressure relief member 50, blocking particulate matter and pollutants in the air from entering the interior of the housing 10 along the first pressure relief member 50 and avoiding situations such as incomplete disconnection of the fuse core 40 caused by particulate matter or pollutants. When the fuse has an overcurrent or overheating situation, the fuse core 40 will quickly melt under the action of the auxiliary fusing agent, and the gas generated when the fuse core 40 melts can impact the first breakthrough point 60, thereby breaking or squeezing the weak point to form a gap, and then the gas is discharged out of the housing 10 along the first pressure relief member 50 to improve the breaking capacity of the fuse and ensure the safety of the circuit.

[0046] It should be understood that the gas generated when the fuse core 40 is disconnected does not necessarily need to completely break through the first breakthrough point 60. When the first breakthrough point 60 is squeezed by the gas generated by the melting of the fuse core 40, the first breakthrough point 60 is prone to deformation and position offset due to its relative weakness, and the deformation and position offset can also generate a gap for the gas to flow out, and the first breakthrough point 60 can block the metal particles generated after the fuse core 40 melts in the gas.

[0047] In some preferred embodiments, the first breakthrough point 60 can be a cut surface. Under normal conditions, the two sides of the cut surface are in contact with each other to isolate the fuse core 40 and the first pressure relief member 50. When the fuse core 40 melts, the generated gas can squeeze the first breakthrough point 60, causing the cut surface to separate to form a gap and discharging the gas out of the housing 10 along the first pressure relief member 50.

[0048] Preferably, the seal 20 can be made of rubber, silicone rubber or other elastic materials, which can provide better sealing performance, plasticity and deformation possibility.

[0049] The electrode sheet 30 includes a first electrode sheet 31 and a second electrode sheet 32. Specifically, the first electrode sheet 31 and the second electrode sheet 32 are respectively located at both ends of the housing 10, penetrate through the housing 10 and the seal 20 respectively, extend into the cavity and are connected to the fuse core 40, and the fuse core 40 connects the first electrode sheet 31 and the second electrode sheet 32.

[0050] The fuse can be connected to the circuit through the first electrode sheet 31 and the second electrode sheet 32 to form a complete loop. When overcurrent or overheating occurs in the loop, the fuse core 40 can quickly melt, thereby causing the first electrode sheet 31 and the second electrode sheet 32 to disconnect, disconnecting the overall current loop and achieving the purpose of protecting the circuit.

[0051] Please combine Figure 1 Refer to Figure 3 and Figure 4 , in some preferred embodiments, as shown in the figure, the housing 10 includes a bottom case 11 and a top case 12. The bottom case 11 and the top case 12 can be covered with each other. The seal 20 includes a first seal 21 and a second seal 22. The first seal 21 and the second seal 22 are respectively arranged on the inner sides of the bottom case 11 and the top case 12. When the bottom case 11 and the top case 12 are covered with each other, the first seal 21 and the second seal 22 are fitted with each other, achieving the effect of isolating the fuse core 40 and the first pressure relief member 50. Blocking substances such as particulate matter and pollutants in the air from entering the housing 10 along the first pressure relief member 50, and avoiding incomplete disconnection of the fuse core 40 caused by particulate matter and pollutants.

[0052] Preferably, the first pressure relief member 50 is arranged on the bottom case 11, then the first breaking point 60 is located on the first seal 21 and corresponds to the position of the first pressure relief member 50. When the fuse core 40 melts, the generated gas can squeeze and break through the first breaking point 60, and then be discharged from the housing 10 along the first pressure relief member 50 to improve the breaking capacity of the fuse.

[0053] In some preferred embodiments, a partition 70 is provided on the top case 12. Specifically, the partition 70 is arranged on the side of the top case 12 facing the bottom case 11, and there are two partitions 70, which are respectively located on both sides of the fuse core 40 to isolate the fuse core 40 and the first pressure relief member 50 or the second pressure relief member 80.

[0054] Under normal conditions, the partition 70 can improve the overall strength of the housing 10 and can also be used to fill the fuse assisting agent. When overcurrent or overheating occurs in the current loop, the fuse assisting agent can help the fuse core 40 achieve quick disconnection, and the partition 70 can also block the metal particles mixed in the gas when the fuse core 40 melts, improving the breaking capacity of the fuse.

[0055] On the basis described above, a second pressure relief member 80 is provided on the top case 12. A second breakthrough point 90 is provided on the second seal 22 at a position corresponding to the second pressure relief member 80. When an overcurrent or over-temperature situation occurs in the current loop, the fuse core 40 can quickly break, and the gas generated during the breaking can squeeze and break through the first breakthrough point 60 and the second breakthrough point 90 to form a gap, and then discharge along the first pressure relief member 50 and the second pressure relief member 80 out of the housing 10, further improving the breaking capacity of the fuse.

[0056] In some preferred embodiments, there are two first pressure relief members 50. Specifically, the two first pressure relief members 50 are respectively arranged at both ends of the bottom case 11. Then, two first breakthrough points 60 are provided on the first seal 21 at positions opposite to the two first pressure relief members 50. In some other embodiments, the two first pressure relief members 50 can also be arranged on the same side of the bottom case 11.

[0057] There are two second pressure relief members 80. The two second pressure relief members 80 are respectively arranged at both ends of the top case 12. Then, two second breakthrough points 90 are provided on the second seal 22 at positions opposite to the two second pressure relief members 80, making the breaking capacity of the fuse more excellent. In some other embodiments, the two second pressure relief members 80 can also be arranged on the same side of the top case 12.

[0058] In some preferred embodiments, through holes 100 are provided on the first electrode plate 31 and / or the second electrode plate 32. Specifically, the first electrode plate 31 and the second electrode plate 32 are relatively located between the first seal 21 and the second seal 22, resulting in the cavity inside the housing 10 being divided into upper and lower parts, and the through holes 100 form gas channels, which can enable the gas in the upper and lower parts to flow, improve the efficiency of gas discharging from the housing 10, and further improve the quick breaking capacity of the fuse.

[0059] Preferably, the setting positions of the first breakthrough point 60 and / or the second breakthrough point 90 correspond to the setting positions of the through holes 100 to further improve the efficiency of gas discharging from the housing 10 and improve the quick breaking capacity of the fuse.

[0060] It can be understood that in some other embodiments, the orthographic projection of the first breakthrough point 60 and / or the second breakthrough point 90 in the top view or bottom view may be smaller than the orthographic projection of the through holes 100 in the top view or bottom view. As long as the orthographic projection of the first breakthrough point 60 and / or the second breakthrough point 90 is within the range of the orthographic projection of the through holes 100, the effect of improving the gas discharging efficiency can be achieved. Of course, the first breakthrough point 60 and / or the second breakthrough point 90 can also be arranged in a staggered manner with the through holes 100, as long as an air flow channel can be formed, and all are within the protection scope of this solution.

[0061] In some preferred embodiments, two first pressure relief members 50 are oppositely arranged at both ends of the bottom case 11, and two second pressure relief members 80 are oppositely arranged at both ends of the top case 12.

[0062] Please refer to Figure 3 for reference Figure 5 , in some preferred embodiments, as shown in the figure, both the first pressure relief member 50 and the second pressure relief member 80 include a pressure relief channel 110. Specifically, during implementation, the pressure relief channel 110 includes an opposite front part and a tail part. The front part of the pressure relief channel 110 is adjacent to the first seal 21 or the second seal 22, and the tail part of the pressure relief channel 110 penetrates through the bottom case 11 or the top case 12 to form an exhaust hole 120. When the fuse core 40 melts, the generated gas can squeeze and break through the first break point 60 and / or the second break point 90, and then discharge from the housing 10 along the pressure relief channel 110 and the exhaust hole 120. Preferably, there can be multiple exhaust holes 120.

[0063] On the basis of the above, a stepped portion 130 is provided on the pressure relief channel 110. Specifically, the stepped portion 130 is provided between the front part and the tail part of the pressure relief channel 110. The front part of the pressure relief channel 110 is located on the lower surface of the stepped portion 130, and the tail part of the pressure relief channel 110 is located on the upper surface of the stepped portion 130. The stepped portion 130 causes a height difference with the front part lower and the tail part higher for the pressure relief channel 110. When the gas generated by the melting of the fuse core 40 flows along the pressure relief channel 110, it will preferentially pass through the stepped portion 130. At this time, due to the height difference, the stepped portion 130 will initially intercept the metal particles mixed in the gas, which can improve the breaking capacity of the fuse.

[0064] In some preferred embodiments, the front part of the pressure relief channel 110 is an "eight"-shaped channel. Specifically, the opening on the side close to the stepped portion 130 is smaller than the opening on the side close to the seal 20. And the "eight"-shaped channel is provided with a bottom groove. The "eight"-shaped opening design is conducive to the first break point 60 or the second break point 90 being broken or deformed under the impact and extrusion of the gas. And after the gas breaks through the first break point 60 and / or the second break point 90 when the fuse core 40 melts, it can provide a guiding direction for the air flow, and the side walls of the "eight"-shaped channel can also play a role in intercepting the metal particles in the air flow. At the same time, the design of the bottom groove can also play a role in pressure relief and exhaust when the first break point 60 or the second break point 90 is deformed and not completely broken.

[0065] When the gas flows through, the stepped portion 130 can first block the metal particles in the air flow. Of course, multiple protrusions can also be provided on the inner side wall of the front part of the pressure relief channel 110 to further block the metal particles, which is not limited here.

[0066] A baffle 140 is provided between the exhaust hole 120 and the step portion 130. When the gas generated by the melting of the fuse core 40 flows through the pressure relief channel 110, the metal particles in the gas can be blocked again by the baffle 140, which can further improve the breaking capacity of the fuse.

[0067] Please refer to Figure 6 and Figure 7 , in some preferred embodiments, as shown in the figure, an air flow groove 150 is formed between the exhaust hole 120 and the step portion 130. Specifically, in this example, only the first pressure relief member 50 is provided on the bottom case 11, and the second pressure relief member 80 is not provided on the top case 12. Therefore, the first pressure relief member 50 can have a higher height. During specific implementation, the exhaust hole 120 is provided at a position close to the top of the first pressure relief member 50, and the height of the step portion 130 is lower than the exhaust hole 120 or equal to the lowest point of the exhaust hole 120. At this time, an air flow groove 150 can be formed between the exhaust hole 120 and the step portion.

[0068] When the gas generated by the melting of the fuse core 40 flows through the first pressure relief member 50, the metal particles mixed in the gas are first intercepted by the step portion 130, and then the gas flows into the air flow groove 150. And the exhaust hole 120 is provided at a position close to the top. When the gas flows through the exhaust hole 120, the metal particles mixed in the gas can be intercepted again by the side wall of the air flow groove 150.

[0069] In some preferred embodiments, the bottom case 11 and the top case 12 are fastened by a connecting member 160. The connecting member 160 can be a rivet or other fasteners, and this case does not limit this.

[0070] In summary, a high-reliability overcurrent and over-temperature fuse provided by the present utility model, compared with the prior art, by providing a sealing member in the housing to isolate the fuse core and the first pressure relief member, blocking the particulate matter and pollutants in the air from entering the housing along the first pressure relief member, and avoiding the incomplete breaking of the fuse core caused by particulate matter or pollutants, thereby achieving the purpose of improving the breaking effect of the fuse.

[0071] Although terms such as sealing member, first pressure relief member, etc. are used more in this article, the possibility of using other terms is not excluded. Using these terms is only to more conveniently describe and explain the essence of the present utility model; interpreting them as any additional limitation is contrary to the spirit of the present utility model.

[0072] In addition, those skilled in the art should understand that although there are many problems in the prior art, each embodiment or technical solution of the present invention can be improved in only one or several aspects, and it is not necessary to solve all the technical problems listed in the prior art or the background art at the same time. Those skilled in the art should understand that the content not mentioned in a claim should not be regarded as a limitation to that claim.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features. And these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high reliability over-current and over-temperature fuse, characterized in that: include A shell body, wherein a fusible core is arranged in the shell body; a sealing member, the sealing member being disposed in the housing; Electrode sheets, the electrode sheets comprising a first electrode sheet and a second electrode sheet, the first electrode sheet and / or the second electrode sheet are provided with through holes, the first electrode sheet and the second electrode sheet are respectively located at two ends of the shell and extend into the shell to be connected to the fuse; Wherein, a first pressure relief component is arranged on the shell, and a first breaking point is provided on the sealing component at a position corresponding to the pressure relief component.

2. The high reliability over-current and over-temperature fuse according to claim 1, characterized in that: The fusible core is a low melting point fusible core with a melting point temperature of less than 232°C.

3. The high reliability over-current and over-temperature fuse according to claim 1, characterized in that: The setting position of the first breakthrough point corresponds to the position of the through hole.

4. The high reliability over-current and over-temperature fuse according to claim 1, characterized in that: The shell includes a bottom shell and a top shell, the seal includes a first seal and a second seal, the first seal is arranged in the bottom shell, the second seal is arranged in the top shell, the first pressure relief component is arranged on the bottom shell, and a first breakthrough point is arranged on the first seal at a position corresponding to the first pressure relief component.

5. The high reliability over-current and over-temperature fuse according to claim 4, characterized in that: The top shell is provided with a partition plate, and the number of the partition plates is two and they are respectively located on both sides of the fusible core.

6. The high reliability over-current and over-temperature fuse according to claim 4, characterized in that: The top shell is provided with a second pressure relief component, and the second sealing component is provided with a second breakthrough point at a position corresponding to the second pressure relief component.

7. The high reliability over-current and over-temperature fuse according to claim 6, characterized in that: There are two of the first pressure relief components and two of the second pressure relief components, the two first pressure relief components are respectively arranged at both ends of the bottom shell, and the two second pressure relief components are respectively arranged at both ends of the top shell, and the number of the first breakthrough points and the second breakthrough points is equal to the number of the first pressure relief components and the second pressure relief components, and the setting positions correspond.

8. The high reliability over-current and over-temperature fuse according to claim 6, characterized in that: The first breaking point and the second breaking point are weak points or cut surfaces on the first sealing component and the second sealing component.

9. The high reliability over-current and over-temperature fuse according to claim 6, characterized in that: The first pressure relief member and the second pressure relief member each include a pressure relief channel, the pressure relief channel including a front portion and a rear portion opposite to each other, the front portion of the pressure relief channel being adjacent to the first seal or the second seal, and the rear portion of the pressure relief channel penetrating the bottom shell or the top shell to form an exhaust hole; The pressure relief channel is provided with a step portion, and the front portion of the pressure relief channel and the tail portion of the pressure relief channel are respectively located on the lower surface and the upper surface of the step portion.

10. The high reliability over-current and over-temperature fuse according to claim 9, characterized in that: The front part of the pressure relief channel is an "eight" shaped channel.

11. The high reliability over-current and over-temperature fuse according to claim 9, characterized in that: A baffle is provided between the exhaust hole and the step portion.

12. The high reliability over-current and over-temperature fuse according to claim 9, characterized in that: An air flow groove is formed between the exhaust hole and the step portion.

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