A safety relief membrane patch structure for aluminum electrolytic capacitors

Abstract

The present application relates to a kind of aluminum electrolytic capacitor safety pressure relief film patch structure, including aluminum electrolytic capacitor body, the aluminum electrolytic capacitor body has a pressure relief hole, the periphery of the pressure relief hole is sealed with safety pressure relief film patch by high-temperature adhesive adhesive.

Description

Technical Field

[0001] This invention relates to the field of aluminum electrolytic capacitor technology, and in particular to a safety relief diaphragm patch structure for aluminum electrolytic capacitors. Background Technology

[0002] Existing aluminum electrolytic capacitors typically employ explosion-proof grooves punched into the aluminum casing for safe voltage relief (see...). Figure 1 This processing method makes it difficult to guarantee the consistency of the processing accuracy of the explosion-proof groove. At the same time, considering that gas will accumulate during the use of capacitors, the explosion-proof groove will deform when the internal gas reaches a certain pressure, causing the internal core to loosen and short circuit, making the product prone to premature failure. If it does not explode in time, it will also cause serious safety hazards. Summary of the Invention

[0003] In view of the above situation, it is necessary to propose a safer and more reliable safety relief diaphragm patch structure for aluminum electrolytic capacitors.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: a safety pressure relief film patch structure for an aluminum electrolytic capacitor, comprising an aluminum electrolytic capacitor body, wherein the aluminum electrolytic capacitor body has a pressure relief hole, and a safety pressure relief film patch is sealed and bonded to the periphery of the pressure relief hole by a high-temperature resistant adhesive.

[0005] Furthermore, the adhesive force of the high-temperature resistant adhesive is less than the burst pressure limit of the safety relief membrane patch.

[0006] Furthermore, the adhesive strength of the high-temperature resistant adhesive is 0.2 MPa to 1.8 MPa, and the burst pressure limit of the safety relief membrane patch is 0.2-1.5 MPa.

[0007] Furthermore, the diameter of the pressure relief hole 140 is 0.1~10mm, the thickness of the safety pressure relief membrane patch 200 is 0.05~2.0mm, the coating thickness of the high temperature resistant adhesive 300 is 0.05~200μm, and the safety pressure relief membrane patch 200 extends more than 15mm horizontally and more than 5mm vertically around the pressure relief hole 140.

[0008] Furthermore, the safety relief membrane patch is hydrogen permeable.

[0009] Furthermore, the safety relief membrane patch is made of a material that is elastic and hydrogen permeable.

[0010] Furthermore, the safety pressure relief membrane patch has several vent holes.

[0011] Furthermore, the safety relief membrane patch includes a rigid substrate, and the safety relief membrane patch has a plurality of vent holes.

[0012] Furthermore, the rigid substrate is covered with a thin film that is permeable to hydrogen.

[0013] Furthermore, the pressure relief hole is formed on the housing or cover of the aluminum electrolytic capacitor body.

[0014] The beneficial effects of this invention are as follows: The purpose of this invention is to provide a safer and more reliable safety relief diaphragm patch structure for aluminum electrolytic capacitors, overcoming the inherent defects in the deformation process of aluminum electrolytic capacitors during pressure relief through explosion-proof grooves in existing technologies. The safety relief diaphragm patch improves the problem of premature failure of the original explosion-proof grooves and avoids serious safety hazards associated with them. When the gas pressure of the aluminum electrolytic capacitor reaches a certain level, the high-temperature resistant adhesive connecting the safety relief diaphragm patch will be ruptured for safe pressure relief, or the safety relief diaphragm patch will burst to release pressure without causing deformation of the aluminum shell, thus avoiding premature failure due to shell deformation. Because the consistency of the safety relief diaphragm patch and its connection structure is easier to control more precisely, serious safety hazards caused by failure to burst in time will not occur.

[0015] The safety relief membrane patch of this invention is bonded to a high-temperature resistant adhesive using an adhesive method, achieving a sealed connection between the safety relief membrane patch and the shell and cover. The safety relief membrane patch allows gas to pass through while providing dust / water / electrolyte leakage prevention, achieving the following effects without sacrificing original functionality:

[0016] (1) Avoid premature failure due to shell deformation. When the internal gas reaches a certain pressure, the explosion-proof groove will deform, causing the internal core to loosen and thus short-circuit.

[0017] (2) Avoid serious safety hazards. Because the consistency of the safety relief membrane patch and its connection structure can be more precisely controlled, there will be no serious safety hazards caused by failure to burst in time.

[0018] (3) A suitable high-temperature resistant adhesive can ensure a stable, durable and reliable connection.

[0019] (4) Adapt to the constantly changing air pressure and temperature conditions during the manufacturing and use process to avoid the delamination and failure of the safety relief membrane patch. Attached Figure Description

[0020] Figure 1 This is a structural schematic diagram of an existing explosion-proof groove;

[0021] Figure 2 This is a cross-sectional structural schematic diagram of a safety relief membrane patch structure for an aluminum electrolytic capacitor according to an embodiment of the present invention;

[0022] Figure 3This is a schematic diagram of the cylindrical shell structure of an aluminum electrolytic capacitor safety relief diaphragm patch structure according to an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the structure of a disc-shaped cover for a safety relief diaphragm patch structure of an aluminum electrolytic capacitor according to an embodiment of the present invention.

[0024] Figure 5 This is a schematic diagram of the block-shaped housing of an aluminum electrolytic capacitor safety relief diaphragm patch structure according to an embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of the plate-shaped cover of a safety relief membrane patch structure for an aluminum electrolytic capacitor according to an embodiment of the present invention;

[0026] Figure 7 This is a schematic diagram of a non-porous safety relief membrane patch structure for an aluminum electrolytic capacitor according to an embodiment of the present invention;

[0027] Figure 8 This is a schematic diagram of a circular safety relief membrane patch with vent holes, representing an embodiment of the present invention for an aluminum electrolytic capacitor safety relief membrane patch structure.

[0028] Figure 9 This invention relates to a square safety relief membrane patch with vent holes for an aluminum electrolytic capacitor, as described in an embodiment of the present invention.

[0029] Figure 10 This invention relates to a triangular safety relief membrane patch with vent holes for an aluminum electrolytic capacitor.

[0030] Label Explanation:

[0031] 100. Aluminum electrolytic capacitor body;

[0032] 110. Explosion-proof groove;

[0033] 120. Shell;

[0034] 130. Cover;

[0035] 140. Pressure relief hole;

[0036] 200. Safety relief diaphragm patch;

[0037] 210. Ventilation holes;

[0038] 300. High-temperature resistant adhesive. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this invention clearer, the following detailed description of a safety relief diaphragm patch structure for an aluminum electrolytic capacitor, in conjunction with the accompanying drawings and embodiments, provides further illustrative information. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of the invention.

[0040] Example 1

[0041] Please refer to Figures 2-7 A safety pressure relief membrane patch 200 structure for an aluminum electrolytic capacitor includes an aluminum electrolytic capacitor body 100, the aluminum electrolytic capacitor body 100 having a pressure relief hole 140, and the periphery of the pressure relief hole 140 being sealed and bonded with a safety pressure relief membrane patch 200 by a high-temperature resistant adhesive 300.

[0042] The safety relief diaphragm patch 200 is bonded to the high-temperature resistant adhesive 300 using an adhesive method. The high-temperature resistant adhesive 300 ensures a stable and durable connection, achieving a sealed connection between the safety relief diaphragm patch 200 and the shell 120 and cover 130. The safety relief diaphragm patch 200 allows gas passage while providing dust / water / electrolyte leakage prevention. When gas accumulates and reaches a certain pressure, the high-temperature resistant adhesive 300 connecting the safety relief diaphragm patch 200 will be forced open to release pressure safely, or the safety relief diaphragm patch 200 will burst to release pressure without causing deformation of the aluminum shell, thus avoiding premature failure due to shell deformation. Because the consistency of the safety relief diaphragm patch 200 and its connection structure is easily controlled more precisely, serious safety hazards caused by failure to burst in time are avoided.

[0043] Preferably, the adhesive force of the high-temperature resistant adhesive 300 is less than the burst pressure limit of the safety relief membrane patch 200. That is, when the pressure inside the aluminum electrolytic capacitor reaches the adhesive force of the high-temperature resistant adhesive 300, the high-temperature resistant adhesive 300 fails, and the safety relief membrane patch 200 detaches.

[0044] Preferably, the adhesive force of the high-temperature resistant adhesive 300 is 0.5 MPa to 0.8 MPa, and the burst pressure limit of the safety relief membrane patch 200 is 0.8 to 1.2 MPa.

[0045] Understandably, the safety relief diaphragm patch 200 can be made of either metallic or non-metallic materials. Understandably, the pressure-bearing capacity of the safety relief diaphragm patch 200 is lower than that of the aluminum electrolytic capacitor body 100 (shell 120 and cover 130). Generally speaking, the pressure-bearing capacity of non-metallic materials is lower than that of metallic materials. Therefore, if a high pressure-bearing value is required, a metallic material can be selected; preferably, the safety relief diaphragm patch 200 is made of a non-metallic material, specifically, silicone, PP, Teflon, or other non-metallic materials, ensuring that the safety relief diaphragm patch 200 can rupture before the aluminum electrolytic capacitor body 100, releasing pressure in a timely manner. That is, under special circumstances, when the pressure exceeds the withstand limit of the safety relief diaphragm patch 200, the safety relief diaphragm patch 200 can burst and release pressure.

[0046] Preferably, the diameter of the pressure relief hole 140 is 0.1~10mm.

[0047] Preferably, the thickness of the safety relief membrane patch 200 is 0.05~2.0mm, and particularly, the thickness of the safety relief membrane patch 200 is 0.5~2.0mm.

[0048] Preferably, the spraying thickness of the high-temperature resistant adhesive 300 is 0.05~200μm.

[0049] Specifically, the safety relief membrane patch 200 extends more than 15mm horizontally and more than 5mm vertically from the center of the pressure relief hole 140. This ensures that the safety relief membrane patch has sufficient adhesion and will not easily detach.

[0050] Please refer to Figures 3-6 The pressure relief hole 140 is located on the housing 120 or cover 130 of the aluminum electrolytic capacitor body 100. Understandably, the safety relief diaphragm patch 200 completely covers the pressure relief hole 140, and the high-temperature resistant adhesive 300 can be pre-sprayed around the pressure relief hole 140 or directly sprayed onto the surface of the safety relief diaphragm. Please refer to [the relevant documentation / reference]. Figures 7-10 Safety relief diaphragm patches (200mm) are available in any shape, including square, round, triangular, and regular polygonal shapes. Please refer to [reference needed]. Figure 3 The housing 120 is cylindrical, and the pressure relief hole 140 is located on the peripheral wall or end face of the housing 120. Please refer to... Figure 4 The shell 120 is cylindrical, the cover 130 is disc-shaped, and the pressure relief hole 140 is located on the cover 130. Please refer to... Figure 5 The housing 120 is block-shaped, and the pressure relief hole 140 is located on any side of the housing 120. Please refer to... Figure 6 The shell 120 is block-shaped, the cover 130 is plate-shaped, and the pressure relief hole 140 is opened on the cover 130.

[0051] Specifically, such as Figure 2As shown, the safety relief membrane patch 200 is made of silicone and has a thickness of 0.2 mm. The pressure relief hole 140 has a diameter of 1 mm and is coated with high-temperature resistant adhesive 300 on its surrounding surface. The safety relief membrane patch 200 completely covers the pressure relief hole 140 and is sealed with high-temperature resistant adhesive 300.

[0052] Understandably, the high-temperature adhesive 300 can be added separately or it can be integrated into the safety relief membrane patch 200. For example, if a tape-type safety relief membrane patch 200 is used, it already contains the high-temperature adhesive 300, eliminating the need for additional coating. Simply put, it can be coated on one side only, such as only on the aluminum electrolytic capacitor body 100 or only on the safety relief membrane patch 200. Alternatively, it can be coated on both sides simultaneously, i.e., on both the aluminum electrolytic capacitor body 100 and the safety relief membrane patch 200.

[0053] The pressure relief method used in Example 1 is as follows: when the pressure reaches its limit (generally around 0.7 MPa), the high-temperature adhesive 300 is broken, causing the safety pressure relief membrane patch 200 to detach, thereby releasing pressure through the pressure relief hole 120. Simultaneously, if a sudden, instantaneous high pressure exceeds the limit of the safety pressure relief membrane patch 200, the safety pressure relief membrane patch 200 can also burst to release pressure.

[0054] Example 2

[0055] Unlike Example 1, the adhesive force of the high-temperature resistant adhesive 300 is greater than the burst pressure limit of the safety relief membrane patch 200.

[0056] When the pressure continues to rise, the safety relief membrane patch 200 will burst directly to release the pressure.

[0057] Generally, the safety relief diaphragm patch 200 is made of non-metallic materials, such as PP or PC. Non-metallic materials are more prone to bursting. Alternatively, a sufficiently thin metallic material, such as thin copper or steel sheet, can be used as needed. Manganese steel or high-tin bronze is generally easier to burst, and gallium alloys can also be used. In particular, a mixture of metal particles and metal or metal-like adhesive materials can be used. When pressed and cooled at high temperature, this type of metal sheet is easy to break into powder after bursting, thereby reducing the safety hazards caused by the burst.

[0058] Example 3

[0059] The safety relief membrane patch 200 in Example 3 is made of a hydrogen-permeable material, such as silicone or plastic film.

[0060] Furthermore, the adhesive force of the high-temperature resistant adhesive 300 in Example 2 can be less than the burst pressure limit of the safety relief membrane patch 200, meaning that under normal circumstances, the high-temperature resistant adhesive 300 will fail to adhere, and the safety relief membrane patch 200 will detach. Alternatively, the adhesive force of the high-temperature resistant adhesive 300 can also be greater than the burst pressure limit of the safety relief membrane patch 200. That is, during pressure relief, the safety relief membrane patch 200 will burst.

[0061] At this initial stage, the hydrogen gas generated by the aluminum electrolytic capacitor can be released through the safety relief diaphragm patch 200, thereby improving the service life of the aluminum electrolytic capacitor and delaying the bursting and pressure relief time.

[0062] Example 4

[0063] Example 4 is a further improvement on Example 3:

[0064] The safety relief membrane patch 200 has several vent holes 210. The vent holes 210 increase gas permeability, allowing not only hydrogen but also other gases to pass through. Preferably, the diameter of the vent holes 210 is 0.01~500μm. Preferably, the vent holes 210 are drilled using a laser; laser drilling has high precision and ensures that the vent hole diameter is sufficiently small.

[0065] Example 5

[0066] Example 5 is another improvement on Example 3:

[0067] The safety relief membrane patch 200 is made of an elastic material that allows hydrogen permeability, such as silicone. The safety relief membrane patch 200 has three stages: the first stage is when the gas pressure is low, hydrogen permeates through the microscopic cross-section or microporous structure of the safety relief membrane patch 200; the second stage is as the gas pressure continues to increase, the safety relief membrane patch 200 deforms, and its hydrogen permeability increases; the third stage is as the gas pressure continues to increase, reaching or exceeding the pressure-bearing capacity of the safety relief membrane patch 200. At this point, the high-temperature adhesive 300 fails, the safety relief membrane patch 200 detaches, and the gas will directly leak out from the pressure relief hole 140. Under special circumstances, the safety relief membrane patch 200 can also burst directly. The three-stage pressure relief method can greatly extend the service life of the capacitor. The total amount of gas released is increased, but the intensity of the explosion is reduced, thus improving safety. It also improves the capacitor performance during its service life. Since the safety pressure relief diaphragm patch 200 is always releasing pressure, the pressure inside the capacitor is not easy to accumulate, which avoids the situation of loosening of the internal core and causing short circuit, and ensures safety.

[0068] Example 6

[0069] Example 6 is a further improvement on Example 5:

[0070] Please refer to Figures 8-10 In another embodiment of the present invention, the safety relief membrane patch 200 is made of an elastic material that is hydrogen permeable, and the safety relief membrane patch 200 has a plurality of vent holes 210. The vent holes 210 increase gas permeability, allowing not only hydrogen but also other gases to pass through. Preferably, the diameter of the vent holes 210 is 0.01~500μm. When the safety relief membrane patch 200 is made of silicone, due to the properties of silicone, the diameter of its vent holes 210 is preferably 1-20μm. This further enhances gas permeability, resulting in a further increase in the total amount of gas released, and further enhancing its service life and performance stability during use. Furthermore, as the elastic safety relief membrane patch 200 deforms, the pore size of the vent holes 210 increases accordingly, thereby enhancing gas permeability.

[0071] Example 7

[0072] Please refer to Figures 8-10 Unlike embodiments four and six, the safety relief membrane patch 200 includes a rigid substrate, and the safety relief membrane patch 200 has a plurality of vent holes 210. These vent holes allow internal air pressure to be released. Preferably, the diameter of the vent holes 210 is 0.01~500μm. Preferably, the rigid substrate is made of PP (polypropylene) or Teflon. When the safety relief membrane patch 200 uses PP or Teflon material, due to the characteristics of PP and Teflon materials, preferably, the diameter of its vent holes 210 is 0.01~500μm, particularly, the diameter of the vent holes 210 is 0.1-20μm.

[0073] Example 8

[0074] Example 8 is a further improvement based on Example 7:

[0075] Please refer to Figures 8-10 The safety relief membrane patch 200 includes a rigid substrate and has several vent holes 210. The rigid substrate 200 is covered with a hydrogen-permeable membrane. On one hand, the vent holes do not have filtering capabilities, allowing all gases to pass through; by using a hydrogen-permeable membrane, only hydrogen can be allowed to pass through. On the other hand, since the permeability of the vent holes is too high, the membrane can reduce permeability. Simply put, the rigid substrate can be soaked, coated with a film liquid and dried to form the film, or the film can be directly adhered. The film can be made of materials such as silicone, polyethylene, or polypropylene.

[0076] The purpose of this invention is to provide a safer and more reliable safety relief diaphragm patch structure for aluminum electrolytic capacitors. This overcomes the inherent defects in the deformation process of aluminum electrolytic capacitors during pressure relief through explosion-proof grooves in existing technologies. The safety relief diaphragm patch improves upon the premature failure of the original explosion-proof grooves and avoids serious safety hazards associated with them. When gas accumulates and reaches a certain pressure, the safety relief diaphragm patch deforms or even bursts without causing deformation of the aluminum shell, thus preventing premature failure due to shell deformation. Furthermore, the consistency of the safety relief diaphragm patch structure is easier to control precisely, preventing serious safety hazards caused by failure to burst in time.

[0077] The safety relief membrane patch of this invention is bonded to a high-temperature resistant adhesive using an adhesive method, achieving a sealed connection between the safety relief membrane patch and the shell and cover. The safety relief membrane patch allows gas to pass through while providing dust / water / electrolyte leakage prevention, achieving the following effects without sacrificing original functionality:

[0078] (1) Avoid premature failure due to shell deformation. When the internal gas reaches a certain pressure, the explosion-proof groove will deform, causing the internal core to loosen and resulting in a short circuit. However, with the safety relief membrane patch 200, when the internal gas reaches a certain pressure, it can be depressurized through the safety relief membrane patch 200.

[0079] (2) Avoid causing serious safety hazards. Because the consistency of the safety relief membrane patch structure is easier to control more precisely, there will be no serious safety hazards caused by failure to burst in time.

[0080] (3) A suitable high-temperature resistant adhesive can ensure a stable, durable and reliable connection.

[0081] (4) Adapt to the constantly changing air pressure and temperature conditions during the manufacturing and use process to avoid the delamination and failure of the safety relief membrane patch.

[0082] (5) The safety relief diaphragm patch has a variety of materials and structures, and can be made of metal or non-metal. It can be perforated or not, and can be suitable for aluminum electrolytic capacitors of different specifications and requirements.

[0083] In summary, the safety relief diaphragm patch structure for aluminum electrolytic capacitors provided by this invention employs an adhesive method to bond the safety relief diaphragm patch to a high-temperature resistant adhesive, achieving a sealed connection between the safety relief diaphragm patch and the shell and cover. The safety relief diaphragm patch allows gas passage while providing dust / water / electrolyte leakage prevention. When the internal gas pressure of the aluminum electrolytic capacitor body reaches a certain level, the safety relief diaphragm patch ruptures, releasing pressure. It exhibits strong stability, high reliability, and high consistency. This effectively improves upon the problem of premature failure in traditional explosion-proof slots, avoiding the serious safety hazards associated with explosion-proof slots.

[0084] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. An aluminum electrolytic capacitor safety relief film patch structure, characterized by, The device includes an aluminum electrolytic capacitor body, which has a pressure relief hole, and a safety pressure relief diaphragm patch is sealed and bonded to the periphery of the pressure relief hole with a high-temperature resistant adhesive.

2. The safety relief film patch structure for aluminum electrolytic capacitor according to claim 1, wherein The adhesive strength of the high-temperature resistant adhesive is less than the burst pressure limit of the safety relief membrane patch.

3. An aluminum electrolytic capacitor safety relief film patch structure according to claim 2, wherein The adhesive strength of the high-temperature resistant adhesive is 0.2 MPa to 1.8 MPa, and the burst pressure limit of the safety relief membrane patch is 0.2-1.5 MPa.

4. The safety relief film patch structure for aluminum electrolytic capacitor according to claim 1, wherein The diameter of the pressure relief hole 140 is 0.1~10mm, the thickness of the safety pressure relief membrane patch 200 is 0.05~2.0mm, the coating thickness of the high temperature resistant adhesive 300 is 0.05~200μm, and the safety pressure relief membrane patch 200 extends more than 15mm horizontally and more than 5mm vertically with the pressure relief hole 140 as the center.

5. The safety relief film patch structure for aluminum electrolytic capacitor according to claim 1, wherein The safety relief membrane patch is hydrogen permeable.

6. An aluminum electrolytic capacitor safety relief film patch structure according to claim 5, wherein The safety relief membrane patch is made of a material that is elastic and hydrogen permeable.

7. An aluminum electrolytic capacitor safety relief film patch structure according to claim 5 or 6, characterized in that, The safety relief membrane patch has several vent holes.

8. The safety relief film patch structure for aluminum electrolytic capacitor according to claim 1, wherein The safety relief membrane patch includes a rigid substrate, and the safety relief membrane patch has a plurality of vent holes.

9. An aluminum electrolytic capacitor safety relief film patch structure according to claim 8, wherein The rigid substrate is covered with a thin film that is permeable to hydrogen.

10. The safety relief film patch structure for aluminum electrolytic capacitor according to claim 1, wherein The pressure relief hole is located on the casing or cover of the aluminum electrolytic capacitor body.

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