Capacitor aluminum shell and capacitor

Abstract

The utility model provides a capacitor aluminum shell and a capacitor, the capacitor aluminum shell comprises a shell, the bottom of the shell is provided with a double-layer structure, the double-layer structure comprises an inner layer and an outer layer which are distributed along the inside and outside direction of the shell, the inner layer is a separator with a through hole, and the outer layer is an outer shell bottom with an explosion-proof groove. The capacitor aluminum shell provided by the utility model comprises the separator with the through hole, so that the flow of internal gas is not influenced, the core bag can be effectively fixed, the core bag is prevented from shaking, the core bag is prevented from deforming towards the bottom space under internal pressure, the instability of the core bag structure and even short-circuit breakdown caused by extrusion of materials in the core bag are avoided, and the service life of the capacitor aluminum shell is prolonged. Therefore, the use safety of the capacitor is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of capacitors, in particular to a capacitor aluminum shell and a capacitor. Background Art

[0002] Capacitors are energy storage components and one of the most commonly used electronic components. Aluminum electrolytic capacitors are the most widely used traditional capacitors. They are prone to heat generation and gas production during operation. These gases may come from the vapor pressure formed by the volatilization of the electrolyte itself, or hydrogen, oxygen, and water vapor generated during operation. These gases cause the internal pressure of the sealed capacitor to increase, resulting in bulging at the bottom of the aluminum shell, enlargement of the internal space of the aluminum shell, and shaking of the internal core package. At the same time, under the action of internal pressure, the middle of the core package sinks, and the material protrudes from the bulging space at the bottom, causing a certain deformation, resulting in an unstable core package structure and even short-circuit breakdown. In order to solve this technical problem, the prior art designs a pressure relief valve structure at the bottom of the aluminum shell so that gas and heat can be safely discharged without explosion, but the pressure relief valve has a certain pressure upper limit. When the valve opening pressure is not reached, the bottom of the aluminum shell will still bulge, causing deformation and loosening of the core package, affecting the normal operation of the capacitor. In addition, when the pressure relief valve opens, the protruding material at the bottom of the core package will disintegrate, causing debris to fly out of the valve, causing circuit pollution or even short circuit, affecting the operation and safety of the entire circuit. Therefore, it is urgent to provide a capacitor aluminum shell that can prevent the core package from deforming. Utility Model Content

[0003] The utility model aims to solve one of the technical problems in the related art to at least a certain extent. To this end, the utility model provides a capacitor aluminum shell, the capacitor aluminum shell includes a shell, the bottom of the shell is provided with a double-layer structure, the double-layer structure includes an inner layer and an outer layer distributed along the inner and outer directions of the shell, wherein the inner layer is an isolation member with a through hole, and the outer layer is an outer shell bottom provided with an explosion-proof groove. In this way, the flow of gas inside the aluminum shell is not affected, and when the pressure inside the aluminum shell reaches the upper limit, the bottom explosion-proof groove can be opened normally, and the gas can be discharged downward; it can also prevent the core package from bulging downward, control its deformation, limit the accommodating range of the core package, and prevent the core package from shaking due to bulging at the bottom of the aluminum shell.

[0004] To this end, the first aspect of the utility model provides a capacitor aluminum shell. According to an embodiment of the utility model, the capacitor aluminum shell includes a shell, the bottom of the shell is provided with a double-layer structure, the double-layer structure includes an inner layer and an outer layer distributed along the inner and outer directions of the shell, wherein the inner layer is an isolation member with a through hole, and the outer layer is an outer shell bottom provided with an explosion-proof groove.

[0005] The capacitor aluminum shell provided by the utility model includes a spacer with a through hole, which does not affect the flow of internal airflow, and can effectively fix the core package, prevent the core package from shaking, and prevent the core package from deforming to the loose bottom space under internal pressure, and will not squeeze out the material in the core package to cause the core package structure to be unstable or even short-circuit and break down. At the same time, the structure can also maintain good contact with the core package in the aluminum shell, which is conducive to the heat dissipation of the overheated core package.

[0006] The capacitor aluminum shell of the above embodiment of the utility model may also have at least one of the following additional technical features:

[0007] According to an embodiment of the present invention, the isolation member is provided with at least one through hole.

[0008] According to an embodiment of the utility model, the isolation member is provided with a plurality of through holes, and the plurality of through holes are arranged at intervals, so that the isolation member has a relatively good stable structure, is not easy to deform, and does not affect the flow rate of the gas under high pressure.

[0009] According to an embodiment of the present invention, the shape of the through hole is at least one of a circle, a polygon, and an irregular shape.

[0010] According to an embodiment of the utility model, the thickness of the isolation member is 0.1-3 times the thickness of the outer shell bottom, thereby better limiting the movement of the core package.

[0011] According to an embodiment of the utility model, the isolation member is connected to or integrally formed with the housing, thereby preventing the isolation member from loosening and further ensuring its limiting effect on the core package.

[0012] According to the embodiment of the utility model, the outer shell bottom is provided with a plurality of explosion-proof grooves, which extend radially from the center of the outer shell bottom to the surroundings, and the side walls of two adjacent explosion-proof grooves are connected. Therefore, when the pressure inside the aluminum shell is too high, gas can enter the bottom of the aluminum shell, and the explosion-proof grooves bulge until they are expanded, releasing gas and heat, thereby preventing the capacitor from exploding.

[0013] According to an embodiment of the utility model, the depth of the explosion-proof groove is 1 / 5-4 / 5 of the thickness of the outer shell bottom.

[0014] The second aspect of the utility model provides a capacitor, which includes the capacitor aluminum shell described in the first aspect. Therefore, the capacitor not only has an explosion-proof effect, but also can prevent the internal core package from shaking when the internal pressure is too large.

[0015] The beneficial effects of the capacitor aluminum shell provided by the utility model are as follows:

[0016] The capacitor aluminum shell includes an isolator with a through hole, which ensures the free flow of gas inside the aluminum shell. When the internal pressure of the aluminum shell is too high, the gas can enter the bottom of the aluminum shell until the explosion-proof groove is opened, releasing gas and heat to prevent the capacitor from exploding. At the same time, the isolator can effectively fix the core package to prevent it from shaking, avoid deformation of the core package to the loose bottom space under internal pressure, and avoid the extrusion of materials in the core package, resulting in instability of the core package structure or even short circuit breakdown. In addition, the isolator can maintain good contact with the core package in the aluminum shell, which is conducive to the heat dissipation of the overheated core package.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 The schematic diagram of the structure of the capacitor aluminum shell provided by the utility model is shown;

[0020] Figure 2 An enlarged view of the bottom structure of the capacitor aluminum shell provided by the utility model is shown;

[0021] Figure 3 A top view of the capacitor aluminum shell provided by the utility model is shown;

[0022] Figure 4 A top view of the isolation element provided by the utility model is shown.

[0023] Reference numerals:

[0024] Shell 1, isolation piece 2, explosion-proof groove 3. DETAILED DESCRIPTION

[0025] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0026] In the description of the present utility model, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are 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 therefore cannot be understood as a limitation on the present utility model. In addition, features defined as "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, "multiple" means two or more.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] As used herein, the terms "optionally", "optional" or "optionally" generally mean that the subsequently described event or circumstance may but need not occur, and that the description includes instances where the event or circumstance occurs and instances where it does not.

[0029] According to an embodiment of the utility model, the utility model provides a capacitor aluminum shell, such as Figure 1-2 As shown, the capacitor aluminum shell includes a shell 1, the bottom of the shell is provided with a double-layer structure, the double-layer structure includes an inner layer and an outer layer distributed along the inner and outer directions of the shell, wherein the inner layer is a separator 2, and the outer layer is an outer shell bottom provided with an explosion-proof groove 3, and the separator 2 is provided with a through hole, such as Figure 3-4 shown.

[0030] According to an embodiment of the utility model, the isolating member 2 is provided with at least one through hole, preferably 2-100 through holes, and more preferably 5 through holes. At this time, the structure of the isolating member is relatively stable, not easy to deform, and does not affect the flow of gas under high pressure. Specifically, the number of through holes can be reasonably adjusted according to the actual technical effect. When the isolating member has multiple through holes, adjacent through holes can be arranged equidistantly or irregularly. The shape of the through hole includes but is not limited to circular, polygonal, and irregular shapes, that is, the through hole can be a single shape or a combination of the above shapes.

[0031] According to an embodiment of the utility model, the thickness of the spacer is 0.1-3 times the thickness of the outer shell bottom, including but not limited to any point value of 0.1 times, 0.5 times, 1 times, 1.5 times, 2 times, 2.5 times, 3 times or any range value between two times, thereby better limiting the movement of the core package in the shell. If the thickness of the spacer is set too thin, the strength of the spacer will be reduced, and it will be easy to deform, affecting its limiting effect; if the thickness of the spacer is too thick, it will occupy too much space inside the aluminum shell, resulting in the internal space of the aluminum shell being unable to meet the loading requirements of the core package.

[0032] According to an embodiment of the utility model, the through hole can be arranged at any position of the isolation piece, and the cross-sectional area of ​​the through hole can be any size of the isolation piece, thereby facilitating the free flow of gas inside the aluminum shell. Preferably, the through hole arranged on the isolation piece is directly above the explosion-proof groove, and the cross-sectional area of ​​the through hole arranged on the isolation piece is less than or equal to the cross-sectional area of ​​the opening of the explosion-proof groove.

[0033] According to an embodiment of the utility model, the isolation piece can be connected to the shell, for example, it can be connected to the inner wall of the aluminum shell. The specific connection method can be a detachable connection or a non-detachable connection, wherein the detachable connection includes a threaded connection, a snap connection and a hinge connection, and the non-detachable connection includes welding, riveting and tenon fitting, etc., which can be reasonably selected according to actual preparation requirements. In addition, the isolation piece can also be integrated with the aluminum shell to avoid the situation where the isolation piece itself shakes. At this time, the material of the isolation piece is aluminum with higher strength, which can ensure that the isolation piece is not easily deformed, thereby further ensuring its limiting effect on the core package.

[0034] According to an embodiment of the utility model, the outer shell bottom is provided with a plurality of explosion-proof grooves, such as Figure 3As shown, a plurality of explosion-proof grooves extend radially from the center of the outer shell bottom to the surroundings, and can be specifically in a "Y" shape, a "cross" shape or a "meter" shape to increase the contact area, and the side walls of two adjacent explosion-proof grooves are connected. The explosion-proof groove can be formed by mold processing. The depth of the explosion-proof groove is 1 / 5-4 / 5 of the thickness of the outer shell bottom, which ensures that the explosion-proof groove has the basis of pressure relief capability and also has sufficient pressure resistance. When the internal pressure of the capacitor reaches the maximum pressure that the explosion-proof groove can withstand, the intersection of the explosion-proof groove begins to rupture first, and at the same time, based on the shape and position of the explosion-proof groove, it diffuses and decomposes in different directions, releases gas and heat, and prevents the capacitor from exploding. Specifically, reinforcing ribs can also be set between the explosion-proof groove and the inner wall of the shell, which further ensures that the explosion-proof groove can maintain a relatively stable state when the pressure inside the aluminum shell increases, avoiding deformation or even tearing. When the bottom of the aluminum shell is circular, the ribs can be set along the radius of the bottom of the aluminum shell, and the angles between adjacent ribs are the same. When the area where the ribs are set is subjected to pressure, the pressure can be evenly distributed in various positions to avoid the pressure being concentrated in a certain area. The number and height of the ribs can be reasonably selected according to the specifications of the aluminum shell, for example, the number of ribs can be set to four, six, etc., and the angles between adjacent ribs can be set to 90° or 60°.

[0035] According to the embodiment of the utility model, the cross section of the explosion-proof groove includes but is not limited to a trapezoid, an arc or a triangle, which can be reasonably selected according to the actual explosion-proof effect. The width of the explosion-proof groove can also be reasonably adjusted according to the actual effect. If the width is too large, the pressure of the high-pressure gas is too dispersed, and it is not easy to break the explosion-proof groove, resulting in failure of the explosion-proof groove to release pressure. If the width is too small, it is not conducive to processing.

[0036] According to an embodiment of the utility model, the second aspect of the utility model provides a capacitor, the capacitor comprising the capacitor aluminum shell described in the first aspect. In addition, the capacitor may also include other related components such as a core package and a cover plate.

[0037] The scheme of the utility model will be explained below in conjunction with the embodiments. It will be appreciated by those skilled in the art that the following embodiments are only used to illustrate the utility model and should not be considered as limiting the scope of the utility model. Where specific techniques or conditions are not indicated in the embodiments, the techniques or conditions described in the literature in this area or the product specifications are used. The reagents or instruments used are not indicated by the manufacturer and are all conventional products that can be obtained commercially.

[0038] Example 1

[0039] A capacitor aluminum shell includes a shell, the bottom of the shell is circular and has a double-layer structure, the outer layer is an outer shell bottom with three explosion-proof grooves, the explosion-proof grooves extend from the center of the outer shell bottom to the surroundings in a "Y" shape, and the side walls of two adjacent explosion-proof grooves are connected, with an angle of 120°. The depth of the explosion-proof groove is 1 / 5-4 / 5 of the thickness of the outer shell bottom, and the cross-sectional area of ​​the explosion-proof groove along the horizontal direction is smaller than the cross-sectional area of ​​the outer shell bottom. The inner layer is a separator with a through hole, the separator is integrally formed with the side wall of the shell, the thickness of the separator is 0.5 times the thickness of the outer shell bottom, the through hole set on the separator is directly above the explosion-proof groove, and the cross-sectional area of ​​the through hole set on the separator is equal to the cross-sectional area of ​​the opening of the explosion-proof groove. When the internal pressure of the aluminum shell is too large, the gas flows freely inside the aluminum shell, reaches the bottom of the aluminum shell through the through hole of the separator, and the explosion-proof groove bulges until the explosion-proof groove is opened. The spacer has high strength due to its thickness and structural design and is not easy to deform, so it can limit the movement of the core package and fix it in the original space. Therefore, the explosion-proof groove of the capacitor bulges normally until it opens, releasing gas and heat, avoiding explosion, and improving the safety of product use.

[0040] Comparative Example 1

[0041] A capacitor aluminum shell, whose structure does not contain a separator compared with Example 1. When the internal pressure of the aluminum shell is too high during use, the bottom of the shell gradually bulges, the space at the bottom of the aluminum shell becomes larger, and the core package moves to the bottom and is squeezed. Since the explosion-proof groove is designed as a Y-shaped structure, the bottom of the aluminum shell bulges into a cone with the center as the vertex, and the material in the core package is squeezed downward and deformed. When the deformation is too large, the aluminum foil inside the core package will be exposed, and the aluminum foil will contact the conductive aluminum shell to cause a short circuit, causing the product to break down. When the impact intensity of the airflow is too large, the protruding core package is shattered and flies out from the bottom opening.

[0042] In summary, the utility model provides a capacitor aluminum shell and a capacitor, wherein the bottom of the capacitor aluminum shell is provided with a double-layer structure, and the double-layer structure includes an inner layer and an outer layer distributed along the inner and outer directions of the shell, wherein the outer layer is an outer shell bottom provided with an explosion-proof groove, and the inner layer is an isolating member, and the isolating member is also provided with a through hole, thereby not affecting the flow of gas inside the aluminum shell, and when the pressure inside the aluminum shell reaches the upper limit, the bottom explosion-proof groove can be opened normally, and the gas can be discharged downward; and the core package can be prevented from bulging downward, its deformation is controlled, and the accommodating range of the core package is limited, and the core package will not shake due to bulging of the bottom of the aluminum shell.

[0043] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0044] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A capacitor aluminum shell, characterized in that: It comprises a shell, the bottom of which is provided with a double-layer structure, the double-layer structure comprising an inner layer and an outer layer distributed along the inner and outer directions of the shell, wherein the inner layer is an isolation piece with through holes, and the outer layer is an outer shell bottom provided with explosion-proof grooves.

2. The capacitor aluminum shell according to claim 1, characterized in that: The isolating member is provided with at least one through hole.

3. The capacitor aluminum shell according to claim 1, characterized in that: The through hole has a shape of at least one of a circle and a polygon.

4. The capacitor aluminum shell according to claim 1, characterized in that: The thickness of the isolation piece is 0.1-3 times the thickness of the outer shell bottom.

5. The capacitor aluminum shell according to claim 1, characterized in that: The isolating element is connected to or integrally arranged with the shell.

6. The capacitor aluminum shell according to claim 1, characterized in that: The outer shell bottom is provided with a plurality of explosion-proof grooves, which extend radially from the center of the outer shell bottom to the surrounding areas, and the side walls of two adjacent explosion-proof grooves are connected.

7. The capacitor aluminum shell according to claim 1, characterized in that: The depth of the explosion-proof groove is 1 / 5-4 / 5 of the thickness of the outer shell bottom.

8. A capacitor, characterized in that: The capacitor aluminum shell comprises the capacitor aluminum shell according to any one of claims 1 to 7.

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