Safety pressure relief film patch structure of aluminum electrolytic capacitor

Abstract

The invention relates to a safety pressure relief film patch structure of an aluminum electrolytic capacitor, which comprises an aluminum electrolytic capacitor body, the aluminum electrolytic capacitor body is provided with a pressure relief hole, and the periphery of the pressure relief hole is hermetically bonded with a safety pressure relief film patch through a high-temperature-resistant adhesive.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum electrolytic capacitors, and in particular to a safety pressure relief film patch structure of an aluminum electrolytic capacitor. Background Art

[0002] Existing aluminum electrolytic capacitors usually use an explosion-proof groove punched out on the aluminum shell by processing to safely release pressure (see Figure 1 ), this processing method is difficult to ensure the consistency of the processing accuracy of the explosion-proof groove. At the same time, considering that gas will accumulate during the use of the capacitor, when the internal gas reaches a certain pressure, the explosion-proof groove will deform, causing the internal core package to loosen and cause a short circuit, making the product prone to early failure. If it is not exploded in time, it will 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 aluminum electrolytic capacitor safety pressure relief film patch structure.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: an aluminum electrolytic capacitor safety pressure relief film patch structure, including an aluminum electrolytic capacitor body, the aluminum electrolytic capacitor body has a pressure relief hole, and the periphery of the pressure relief hole is sealed and bonded with a safety pressure relief film patch by a high temperature resistant adhesive.

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

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

[0007] Furthermore, the diameter of the pressure relief hole 140 is 0.1-10 mm, the thickness of the safety pressure relief membrane patch 200 is 0.05-2.0 mm, the spray thickness of the high temperature resistant adhesive 300 is 0.05-200 μm, and the safety pressure relief membrane patch 200 extends more than 15 mm to the left and right and more than 5 mm to the top and bottom with the pressure relief hole 140 as the center.

[0008] Furthermore, the safety pressure relief membrane patch has hydrogen permeability.

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

[0010] Furthermore, the safety pressure relief diaphragm is provided with a plurality of air holes.

[0011] Furthermore, the safety pressure relief diaphragm includes a hard substrate, and a plurality of air holes are provided on the safety pressure relief diaphragm.

[0012] Furthermore, the hard substrate is covered with a hydrogen permeable film.

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

[0014] The beneficial effects of the present invention are as follows: the purpose of the present invention is to provide a safer and more reliable aluminum electrolytic capacitor safety pressure relief film patch structure, so as to overcome the defects implied in the process of pressure relief deformation of aluminum electrolytic capacitors through explosion-proof grooves in the prior art, and to improve the problem of easy early failure of the original explosion-proof grooves through safety pressure relief film patches and avoid the serious safety hazards of explosion-proof grooves. After the gas pressure of the aluminum electrolytic capacitor reaches a certain level, the high temperature resistant adhesive connecting the safety pressure relief film patch will be flushed open for safe pressure relief, or the safety pressure relief film patch will burst to relieve pressure without causing deformation of the aluminum shell, thereby avoiding early failure due to deformation of the shell. Since the consistency of the safety pressure relief film patch and its connection structure is easy to control more precisely, there will be no serious safety hazards caused by failure to burst in time.

[0015] The safety pressure relief film patch of the present invention is bonded with a high temperature resistant adhesive by bonding, so as to realize a sealed connection between the safety pressure relief film patch and the housing and the cover. The safety pressure relief film patch allows gas to pass through and has dust / water / electrolyte leakage prevention performance, and achieves the following effects without losing the original functions:

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

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

[0018] (3) Suitable high temperature resistant adhesive can ensure stable, durable and reliable connection.

[0019] (4) Adapt to the constantly changing air pressure and temperature conditions during the manufacturing process and use process to avoid debonding and failure of the safety pressure relief membrane patch. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of an explosion-proof tank in the prior art;

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

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

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

[0024] Figure 5 It is a structural schematic diagram of a block shell of a safety pressure relief film patch structure of an aluminum electrolytic capacitor according to an embodiment of the present invention;

[0025] Figure 6 It is a structural schematic diagram of a plate-shaped cover body of a safety pressure relief film patch structure of an aluminum electrolytic capacitor according to an embodiment of the present invention;

[0026] Figure 7 It is a schematic structural diagram of a safety pressure relief film patch structure without air permeability of an aluminum electrolytic capacitor according to an embodiment of the present invention;

[0027] Figure 8 It is a schematic structural diagram of a circular safety pressure relief film patch with air permeable holes in a safety pressure relief film patch structure of an aluminum electrolytic capacitor according to an embodiment of the present invention;

[0028] Fig. 9 The invention relates to a square safety pressure relief film patch with air permeable holes in a safety pressure relief film patch structure of an aluminum electrolytic capacitor;

[0029] Fig.10 The invention discloses a triangular safety pressure relief film patch with air permeable holes in a safety pressure relief film patch structure for an aluminum electrolytic capacitor.

[0030] Description of labels:

[0031] 100. Aluminum electrolytic capacitor body;

[0032] 110. Explosion-proof slot;

[0033] 120, housing;

[0034] 130, cover;

[0035] 140. Pressure relief hole;

[0036] 200. Safety pressure relief membrane patch;

[0037] 210, vent holes;

[0038] 300. High temperature resistant adhesive. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the following is a further detailed description of a safety pressure relief film patch structure of an aluminum electrolytic capacitor of the present invention in combination with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0040] Embodiment 1

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

[0042] The safety pressure relief film patch 200 is bonded to the high temperature resistant adhesive 300 by bonding. The high temperature resistant adhesive 300 can ensure a stable, durable and reliable connection, and realize a sealed connection between the safety pressure relief film patch 200 and the housing 120 and the cover 130. The safety pressure relief film patch 200 allows gas to pass through and has dust / water / electrolyte leakage resistance. When the gas accumulation of the aluminum electrolytic capacitor safety pressure relief film patch 200 structure of the present application reaches a certain pressure, after the gas pressure of the aluminum electrolytic capacitor reaches a certain level, the high temperature resistant adhesive 300 connected to the safety pressure relief film patch 200 will be flushed open for safe pressure relief, or the safety pressure relief film patch 200 will burst to relieve pressure without causing deformation of the aluminum shell, thereby avoiding early failure due to deformation of the shell. Since the consistency of the safety pressure relief film patch 200 and its connection structure is easy to control more precisely, there will be no serious safety hazards caused by failure to burst in time.

[0043] Preferably, the adhesive force of the high temperature resistant adhesive 300 is less than the burst limit pressure of the safety pressure relief film patch 200. That is, when the pressure in 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 pressure relief film patch 200 is detached.

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

[0045] It is understandable that the safety pressure relief membrane patch 200 can be made of a metal material or a non-metal material. It is understandable that the pressure bearing capacity of the safety pressure relief membrane is lower than the pressure bearing capacity 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 metal materials. Therefore, if a high pressure bearing value is required, a metal material can be selected; preferably, the safety pressure relief membrane patch 200 is made of a non-metallic material, especially, the safety pressure relief membrane patch 200 is a non-metallic material such as silicone, PP, Teflon, etc., to ensure that the safety pressure relief membrane can rupture before the aluminum electrolytic capacitor body 100 and relieve pressure in time. That is, under special circumstances, when the pressure exceeds the bearing limit of the safety pressure relief membrane patch 200, the safety pressure relief membrane patch 200 can burst and relieve pressure.

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

[0047] Preferably, the thickness of the safety pressure relief film patch 200 is 0.05-2.0 mm, and in particular, the thickness of the safety pressure relief film patch 200 is 0.5-2.0 mm.

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

[0049] In particular, the safety pressure relief film patch 200 extends more than 15 mm to the left and right and more than 5 mm to the top and bottom with the pressure relief hole 140 as the center, so that the safety pressure relief film patch has sufficient adhesion and will not fall off easily.

[0050] Please refer to Figure 3-Figure 6 The pressure relief hole 140 is opened on the shell 120 or the cover 130 of the aluminum electrolytic capacitor body 100. It can be understood that the safety pressure relief film 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 on the surface of the safety pressure relief film. It can be understood, please refer to Figure 7-10 The shape of the safety pressure relief film patch 200 is not limited, and can be square, circular, triangular, regular polygonal, etc. Figure 3 The housing 120 is cylindrical, and the pressure relief hole 140 is provided on the peripheral wall or end surface of the housing 120. Figure 4 The housing 120 is cylindrical, the cover 130 is round, and the pressure relief hole 140 is provided on the cover 130. Figure 5 The housing 120 is block-shaped, and the pressure relief hole 140 is provided on any side of the housing 120. 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, Figure 2As shown, the safety pressure relief membrane patch 200 is made of silicone, the thickness of the safety pressure relief membrane patch 200 is 0.2 mm, the diameter of the pressure relief hole 140 is 1 mm and a high temperature resistant adhesive 300 is sprayed on the surrounding surface, the safety pressure relief membrane patch 200 completely covers the pressure relief hole 140 and is sealed and connected with a high temperature resistant adhesive 300.

[0052] It is understandable that the high temperature resistant adhesive 300 can be added separately or can be provided by the safety pressure relief film patch 200. For example, if a tape-type safety pressure relief film patch 200 is used, the safety pressure relief film patch 200 itself has the high temperature resistant adhesive 300 and does not need to be additionally coated. Simply, it can be coated on one side, such as coating the high temperature resistant adhesive 300 only on the aluminum electrolytic capacitor body 100 or coating the high temperature resistant adhesive 300 only on the safety pressure relief film patch 200, or it can be coated on both sides, that is, coating the high temperature resistant adhesive 300 on both the aluminum electrolytic capacitor body 100 and the safety pressure relief film patch 200.

[0053] That is, the pressure relief method adopted in the first embodiment is that when the pressure reaches the limit value (generally about 0.7Mpa), the high temperature resistant adhesive 300 is broken open to separate the safety pressure relief film patch 200, thereby releasing the pressure through the pressure relief hole 120. At the same time, if a sudden instantaneous high pressure breaks through the limit of the safety pressure relief film patch 200, the safety pressure relief film patch 200 can also burst to release the pressure.

[0054] Embodiment 2

[0055] Different from the first embodiment, the adhesive force of the high temperature resistant adhesive 300 is greater than the bursting limit pressure of the safety pressure relief membrane patch 200 .

[0056] At this time, when the pressure continues to rise, the safety pressure relief membrane patch 200 will burst directly to release the pressure.

[0057] Generally, the safety pressure relief membrane patch 200 is made of non-metallic materials, such as PP or PC. Non-metallic materials are more likely to burst. Sufficiently thin metal materials, such as thin copper sheets and thin steel sheets, can also be used as needed. Generally speaking, manganese steel or high-tin bronze are more likely to burst. Gallium-containing alloys can also be used. In particular, a mixture of metal particles and metal or metal-like adhesive materials can also be used, which is pressed and cooled at high temperature. This metal sheet is easy to break into powder after bursting, thereby reducing the safety hazard caused by the bursting.

[0058] Embodiment 3

[0059] The safety pressure relief membrane patch 200 of the third embodiment is made of hydrogen permeable material, such as silica gel, plastic film, etc.

[0060] The adhesive force of the high temperature resistant adhesive 300 of the second embodiment may be less than the burst limit pressure of the safety pressure relief film patch 200, that is, in general, the high temperature resistant adhesive 300 will fail to bond and the safety pressure relief film patch 200 will detach. Alternatively, the adhesive force of the high temperature resistant adhesive 300 may also be greater than the burst limit pressure of the safety pressure relief film patch 200. That is, when the pressure is released, the safety pressure relief film patch 200 bursts.

[0061] At this time, in the initial stage, the hydrogen generated by the aluminum electrolytic capacitor can be decompressed through the safety pressure relief film patch 200, thereby increasing the service life of the aluminum electrolytic capacitor and delaying the burst pressure relief time.

[0062] Embodiment 4

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

[0064] A plurality of air holes 210 are provided on the safety pressure relief diaphragm 200. The air holes 210 can increase gas permeability, allowing not only hydrogen but also other gases to pass through. Preferably, the diameter of the air holes 210 is 0.01 to 500 μm. Preferably, the air holes 210 are punched by laser, which has high precision and can ensure that the aperture of the air holes is small enough.

[0065] Embodiment 5

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

[0067] The safety pressure relief diaphragm 200 is made of an elastic material that is permeable to hydrogen, such as silica gel. At this time, the safety pressure relief diaphragm has three stages. The first stage is when the gas pressure is low, hydrogen leaks out from the microscopic cross-section or microscopic microporous structure of the safety pressure relief diaphragm 200; the second stage is as the gas pressure continues to increase, the safety pressure relief diaphragm patch 200 deforms, and the hydrogen permeability of the safety pressure relief diaphragm 200 is enhanced; the third stage is as the gas pressure continues to increase and reaches or exceeds the pressure bearing capacity of the safety pressure relief diaphragm patch 200, at this time the high temperature resistant adhesive 300 fails, the safety pressure relief diaphragm patch 200 detaches, and the gas leaks directly from the pressure relief hole 140. Under special circumstances, the safety pressure relief diaphragm patch 200 may 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, which improves safety. It also improves the capacitor performance during its service life. Since the safety pressure relief diaphragm 200 is always relieving pressure, the pressure in the capacitor is not easy to accumulate, which avoids the situation where the internal core package loosens and causes a short circuit, and ensures safety.

[0068] Embodiment 6

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

[0070] Please refer to Figure 8-Figure 10 As another embodiment of the present invention, the safety pressure relief diaphragm 200 is made of a material that is elastic and permeable to hydrogen, and a number of air holes 210 are provided on the safety pressure relief diaphragm. Providing the air holes 210 can increase the gas permeability, allowing not only hydrogen to pass through, but also other gases to pass through. Preferably, the diameter of the air holes 210 is 0.01 to 500 μm. When the safety pressure relief membrane patch 200 is made of silicone material, due to the characteristics of the silicone material, preferably, the diameter of its air holes 210 is 1-20 μm. The gas permeability is further enhanced, so that the total amount of degassing is further increased, so that the service life and performance stability during use are further enhanced. And as the elastic safety pressure relief diaphragm 200 is deformed, the aperture of the air holes 210 will increase, thereby enhancing the gas permeability.

[0071] Embodiment 7

[0072] Please refer to Figure 8-Figure 10 , different from the fourth and sixth embodiments, the safety pressure relief membrane 200 includes a hard substrate, and a plurality of air holes 210 are provided on the safety pressure relief membrane. That is, the internal air pressure is released through the air holes. Preferably, the diameter of the air hole 210 is 0.01 to 500 μm. Preferably, the hard substrate is made of PP (polypropylene) or Teflon. When the safety pressure relief membrane patch 200 is made of PP or Teflon, due to the characteristics of PP and Teflon materials, preferably, the diameter of the air hole 210 is 0.01 to 500 μm, and in particular, the diameter of the air hole 210 is 0.1-20 μm.

[0073] Embodiment 8

[0074] Embodiment 8 is a further improvement on Embodiment 7:

[0075] Please refer to Figure 8-Figure 10 The safety relief diaphragm 200 includes a hard substrate, and a plurality of air holes 210 are provided on the safety relief diaphragm. The hard substrate 200 is covered with a hydrogen permeable film. On the one hand, the air holes do not have screening capabilities, and all gases can pass through. By setting a hydrogen permeable film, only hydrogen can be allowed to pass through; on the other hand, since the air holes have too large a permeability, the permeability can be reduced by the film. Simply put, the hard substrate can be soaked, coated with a film liquid, and then dried to form a film, or the film can be directly bonded. The film can be made of materials such as silicone, polyethylene, and polypropylene.

[0076] The purpose of the present invention is to provide a safer and more reliable aluminum electrolytic capacitor safety pressure relief film patch structure to overcome the defects hidden in the process of pressure relief deformation of aluminum electrolytic capacitors through explosion-proof grooves in the prior art, improve the problem of easy early failure of the original explosion-proof grooves through safety pressure relief film patches and avoid the serious safety hazards of explosion-proof grooves. When the gas accumulation of the aluminum electrolytic capacitor safety pressure relief film patch structure reaches a certain pressure, the safety pressure relief film patch will deform or even burst without causing deformation of the aluminum shell, avoiding early failure due to shell deformation. Since the consistency of the safety pressure relief film patch structure is easy to control more precisely, there will be no serious safety hazards caused by failure to explode in time.

[0077] The safety pressure relief film patch of the present invention is bonded with a high temperature resistant adhesive by bonding, so as to realize a sealed connection between the safety pressure relief film patch and the housing and the cover. The safety pressure relief film patch allows gas to pass through and has dust / water / electrolyte leakage prevention performance, and achieves the following effects without losing the original functions:

[0078] (1) Avoid early failure due to shell deformation. When the internal gas reaches a certain pressure, the explosion-proof groove will deform, causing the internal core package to loosen and short-circuit. When the internal gas reaches a certain pressure, the safety pressure relief diaphragm can be used to relieve the pressure.

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

[0080] (3) Suitable high temperature resistant adhesive can ensure stable, durable and reliable connection.

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

[0082] (5) The safety pressure relief film patch has various materials and structures. It can be made of metal or non-metal, with holes or without holes. It can be suitable for aluminum electrolytic capacitors with different specifications and requirements.

[0083] In summary, the present invention provides a safety pressure relief film patch structure for aluminum electrolytic capacitors. The safety pressure relief film patch is bonded to a high temperature resistant adhesive by bonding, so as to achieve a sealed connection between the safety pressure relief film patch and the housing and cover. The safety pressure relief film patch allows gas to pass through and has dust / water / electrolyte leakage prevention properties. When the internal air pressure of the aluminum electrolytic capacitor body reaches a certain level, the safety pressure relief film patch ruptures to relieve pressure. It has strong stability, reliability, and consistency. It effectively improves the problem of easy early failure of the original explosion-proof tank and avoids the serious safety hazards of the explosion-proof tank.

[0084] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A safety pressure relief film patch structure for an aluminum electrolytic capacitor, characterized in that: The invention comprises an aluminum electrolytic capacitor body, wherein the aluminum electrolytic capacitor body is provided with 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.

2. The aluminum electrolytic capacitor safety pressure relief film patch structure according to claim 1, characterized in that: The adhesive force of the high temperature resistant adhesive is less than the bursting limit pressure of the safety pressure relief membrane patch.

3. The aluminum electrolytic capacitor safety pressure relief film patch structure according to claim 2, characterized in that: The adhesive force of the high temperature resistant adhesive is 0.2Mpa to 1.8Mpa, and the bursting limit pressure of the safety pressure relief membrane patch is 0.2-1.5Mpa.

4. The aluminum electrolytic capacitor safety pressure relief film patch structure according to claim 1, characterized in that: The diameter of the pressure relief hole 140 is 0.1-10 mm, the thickness of the safety pressure relief film patch 200 is 0.05-2.0 mm, the spray thickness of the high temperature resistant adhesive 300 is 0.05-200 μm, and the safety pressure relief film patch 200 extends more than 15 mm to the left and right and more than 5 mm to the top and bottom with the pressure relief hole 140 as the center.

5. The aluminum electrolytic capacitor safety pressure relief film patch structure according to claim 1, characterized in that: The safety pressure relief membrane patch has hydrogen permeability.

6. The aluminum electrolytic capacitor safety pressure relief film patch structure according to claim 5, characterized in that: The safety pressure relief diaphragm is made of a material that is elastic and hydrogen permeable.

7. The aluminum electrolytic capacitor safety pressure relief film patch structure according to claim 5 or 6, characterized in that: The safety pressure relief diaphragm is provided with a plurality of air holes.

8. The aluminum electrolytic capacitor safety pressure relief film patch structure according to claim 1, characterized in that: The safety pressure relief diaphragm comprises a hard substrate, and a plurality of air holes are provided on the safety pressure relief diaphragm.

9. The aluminum electrolytic capacitor safety pressure relief film patch structure according to claim 8, characterized in that: The hard substrate is covered with a hydrogen permeable film.

10. The aluminum electrolytic capacitor safety pressure relief film patch structure according to claim 1, characterized in that: The pressure relief hole is arranged on the shell or cover of the aluminum electrolytic capacitor body.

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