Electrolytic capacitor shell and aluminum electrolytic capacitor
By designing an electrolytic capacitor shell with a liquid storage chamber and pressure relief components, the problem of the unsatisfactory hydrogen removal effect of liquid aluminum electrolytic capacitors when volume reduction and temperature increase is solved, and efficient hydrogen removal and life-extending effect is achieved.
Patent Information
- Application Number
- CN202421452082.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-24
- Publication Date
- 2025-04-15
- Estimated Expiration
- 2034-06-24
AI Technical Summary
When the volume of existing liquid aluminum electrolytic capacitors shrinks and the temperature increases, the hydrogen-disinfecting agent has poor solubility, resulting in unsatisfactory hydrogen-disinfection effect. Excessive gases lead to the electrolyte drying out prematurely, failure in advance, and shortening the life.
An electrolytic capacitor housing is designed, including a partition plate between the first housing and the second housing. A pressure relief member is provided on the partition plate. A liquid storage chamber is provided inside the first housing. The liquid storage chamber is in communication with the pressure relief member for storing hydrogen dehydrating agent, absorbing gas, and replenishing electrolyte and hydrogen dehydrating agent in time through the injection port.
It achieves efficient hydrogen removal effect, extends the service life of liquid aluminum electrolytic capacitors, prevents the electrolyte from drying out prematurely, and ensures the stable operation of the capacitor under high temperature conditions.
Smart Images
Figure CN222762812U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of aluminum electrolytic capacitors, and in particular relates to an electrolytic capacitor shell and an aluminum electrolytic capacitor. Background Art
[0002] Capacitors are one of the three passive devices. As energy storage components, capacitors have the advantages of high power density, long cycle life, fast charge and discharge, fast response, and high safety performance. With the continuous advancement of science and technology, there are more and more emerging devices, and the application fields of capacitors are becoming wider and wider. At present, they are widely used in automation control, communication products, electronic products, optoelectronic products and other fields.
[0003] Aluminum electrolytic capacitors mainly include liquid aluminum electrolytic capacitors, solid aluminum electrolytic capacitors, and solid-liquid mixed aluminum electrolytic capacitors. Among them, aluminum electrolytic capacitors made of pure liquid electrolyte impregnated core packs are liquid aluminum electrolytic capacitors, which have the advantages of low price, large capacity, and good voltage resistance.
[0004] As the size of electronic products is getting smaller and smaller, liquid aluminum electrolytic capacitors are required to have a smaller size accordingly. When the size is smaller, the amount of dehydrogenating agent impregnated into the core package during the preparation of the liquid aluminum electrolytic capacitor will also be reduced. At the same time, as the temperature rises, the liquid aluminum electrolytic capacitor produces too much gas during operation. Since the dehydrogenating agent has poor solubility and its content in the electrolyte is low, it cannot achieve the ideal dehydrogenation purpose. In addition, too high a temperature will also cause the electrolyte to dry up prematurely, causing the liquid aluminum electrolytic capacitor to fail prematurely and shorten its life. Utility Model Content
[0005] In order to solve at least one problem existing in the prior art, the utility model provides an electrolytic capacitor housing and an aluminum electrolytic capacitor having excellent hydrogen removal effect and small size.
[0006] In order to achieve the above objectives, the utility model provides the following technical solutions.
[0007] In a first aspect, the utility model provides an electrolytic capacitor housing, which comprises a first housing and a second housing connected to each other up and down, a partition plate is provided between the first housing and the second housing, and a pressure relief component is provided on the partition plate;
[0008] A liquid storage chamber is provided inside the first shell, and a communicating accommodation channel is formed between the liquid storage chamber and the pressure relief component. The pressure relief component is configured to control opening and closing according to the internal pressure of the second shell to determine the connection and disconnection between the second shell and the accommodation channel.
[0009] In some embodiments of the present invention, an annular baffle is sleeved inside the first shell, and the liquid storage cavity is formed between the annular baffle and the side wall of the first shell; the annular baffle, the partition plate and the bottom wall of the first shell away from the second shell together form the accommodating channel.
[0010] In some embodiments of the present invention, opposite ends of the annular baffle along its axial direction are respectively connected to the partition plate and the bottom wall of the first shell away from the second shell, and at least one through hole is formed on the annular baffle.
[0011] In some embodiments of the present invention, the through hole is opened on a side away from the second shell.
[0012] In some embodiments of the present invention, a first injection port connected to the liquid storage chamber is provided on the first shell for replenishing the hydrogen scavenger into the liquid storage chamber.
[0013] In some embodiments of the present invention, a second injection port connected to the liquid storage cavity is provided on the first shell for replenishing electrolyte into the second shell.
[0014] In some embodiments of the present invention, both the first injection port and the second injection port have a threaded structure.
[0015] In some embodiments of the present invention, the pressure relief component includes a one-way valve structure.
[0016] In some embodiments of the present invention, the first shell and the second shell are both cylindrical structures, and the inner diameter of the first shell is greater than or equal to the inner diameter of the second shell.
[0017] In some embodiments of the present invention, the first shell and the second shell are both made of aluminum and are integrally formed.
[0018] In some embodiments of the present invention, an explosion-proof component is provided on the bottom wall of the first shell away from the second shell.
[0019] In some embodiments of the present invention, in the vertical direction, the height ratio of the first shell to the second shell is (1-3):(6-9).
[0020] In a second aspect of the present invention, an aluminum electrolytic capacitor is provided, comprising a core package and the electrolytic capacitor housing described in the first aspect of the present invention; wherein:
[0021] The core package is packaged in the second shell, and the liquid storage cavity of the first shell is used to be filled with hydrogen remover.
[0022] Compared with the prior art, the utility model achieves the following technical effects:
[0023] 1. In the utility model, through the structural design of the electrolytic capacitor shell, a liquid storage chamber for storing the dehydrogenating agent is arranged inside the first shell to achieve an ideal dehydrogenating effect. At the same time, the accommodating channel connected to the liquid storage chamber has a heat absorption function, and can also store a small amount of gas when the electrolytic capacitor produces gas, and play a buffering role to prevent the electrolytic capacitor from breaking through the explosion-proof valve due to the instantaneous excessive internal gas pressure.
[0024] 2. In the utility model, by providing an injection port, the electrolyte or dehydrogenating agent can be added to the electrolytic capacitor in time. The addition of electrolyte can prevent the electrolyte from drying up prematurely. The addition of dehydrogenating agent can make the gas more fully absorbed in the liquid storage cavity, thereby more effectively extending the service life of the liquid aluminum electrolytic capacitor.
[0025] 3. In the utility model, by setting a partition plate with a pressure relief component, the core package can be encapsulated in the second shell to prevent the core package from shaking, and when excessive gas is produced, the pressure relief component can be opened in time to allow the gas to enter the upper accommodating channel and the liquid storage chamber and then be absorbed.
[0026] 4. The utility model can prevent a large amount of hydrogen remover from entering the second shell through the provision of the annular baffle with through holes, diluting the electrolyte and reducing the performance of the electrolyte, while ensuring that the gas can enter the liquid storage chamber.
[0027] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are listed below. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not to be considered as limiting the present invention. Moreover, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:
[0029] Figure 1 It is a schematic diagram of the structure of an aluminum electrolytic capacitor according to some embodiments of the utility model;
[0030] Figure 2 for Figure 1 Top view of the .
[0031] Description of reference numerals:
[0032] 10. Cover plate; 20. Lead wire; 30. Lead terminal; 40. Aluminum washer; 50. Core package;
[0033] 60. first shell; 61. annular baffle; 62. through hole; 63. accommodating channel; 64. liquid storage chamber; 65. first injection port; 66. second injection port; 67. explosion-proof component;
[0034] 70. Second shell;
[0035] 80. partition plate; 81. pressure relief component;
[0036] 90. Casing. DETAILED DESCRIPTION
[0037] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0038] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.
[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 an indirect connection 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 terms in the present invention can be understood according to specific circumstances.
[0040] The chemical reagents used in the specification and examples of the present invention include any conventional models or types in the art, and the present invention does not impose any special limiting requirements.
[0041] Refer to the following Figures 1 to 2 An electrolytic capacitor housing is described in some embodiments of the present invention.
[0042] Reference Figures 1 to 2 As shown, the electrolytic capacitor housing provided in this embodiment is mainly used for aluminum electrolytic capacitors, which includes a first shell 60 and a second shell 70 connected to each other in an upper and lower manner, a partition plate 80 is provided between the first shell 60 and the second shell 70, and a pressure relief component 81 is provided on the partition plate 80; a liquid storage chamber 64 and a receiving channel 63 corresponding to the pressure relief component 81 are provided inside the first shell 60, and the liquid storage chamber 64 and the receiving channel 63 are connected; wherein the liquid storage chamber 64 is used to store hydrogen remover to absorb the gas discharged from the second shell 70 to achieve efficient hydrogen absorption; the receiving channel 63 plays the role of temporary gas storage and heat absorption; the pressure relief component 81 is used to control the connection and disconnection between the inside of the second shell 70 and the receiving channel 63 according to the internal pressure of the second shell 70.
[0043] Specifically, when too much gas is produced inside the second shell 70, the pressure increases to a limit value or a preset threshold value, and the pressure relief component 81 is opened. At this time, the interior of the second shell 70 is connected to the accommodating channel 63 through the pressure relief component 81, and the gas enters the accommodating channel 63 and enters the liquid storage chamber 64 storing the hydrogen scavenger through the through hole 62, thereby being absorbed.
[0044] When no gas is generated or the gas generated is very small inside the second shell 70, the pressure is less than the limit value or the preset threshold, and the pressure relief component 81 is not opened. At this time, the interior of the second shell 70 is not connected to the accommodating channel 63, forming a closed state, so that the core package 50 can be encapsulated in the second shell 70.
[0045] In the embodiment of the present invention, the pressure relief component 81 is opened only when excessive gas is produced, and is closed when no gas is produced or less gas is produced, thereby stabilizing the core package 50 and preventing the dehydrogenating agent from entering the core package 50 .
[0046] In some embodiments of the present invention, the pressure relief component 81 may be a one-way valve structure for easy installation.
[0047] Of course, other structural components that can achieve the same effect are also possible, and are not limited to the one-way valve structure.
[0048] In the embodiment of the utility model, the arrangement of the accommodating channel 63 in the first shell 60 can play a buffering role when the electrolytic capacitor produces too much gas, preventing the electrolytic capacitor from breaking through the explosion-proof component 67, such as the explosion-proof valve, due to the instantaneous excessive internal gas pressure.
[0049] Reference Figure 1 As shown, an annular baffle 61 is sleeved inside the first shell 60, and the space between the annular baffle 61 and the side wall of the first shell 60 forms a liquid storage chamber 64, so as to prevent the hydrogen remover from flowing out; the annular baffle 61, the partition plate 80 and the bottom wall of the first shell 60 away from the second shell 70 are surrounded to form an accommodating channel 63.
[0050] In some embodiments of the utility model, the lower end of the annular baffle 61 along its axial direction is connected to the partition plate 80, and there is a gap between the upper end and the bottom wall of the first shell 60 away from the second shell 70 to form a channel connected to the liquid storage chamber 64, ensuring that the gas enters the liquid storage chamber 64 to be absorbed.
[0051] In some embodiments of the utility model, the opposite ends of the annular baffle 61 along the axial direction thereof are respectively connected to the partition plate 80 and the bottom wall of the first shell 60 away from the second shell 70, and at least one through hole 62 is provided on the annular baffle 61 to form a channel connecting the accommodating channel 63 and the liquid storage chamber 64. When excessive gas is produced inside the second shell 70 and the pressure relief component 81 is opened, the gas enters the liquid storage chamber 64 storing the hydrogen scavenger through the through hole 62, contacts with the hydrogen scavenger, and is thereby absorbed.
[0052] In some embodiments of the utility model, the through hole 62 is opened on a side away from the second shell 70 to reduce the amount of hydrogen scavenger or hydrogen absorber entering the accommodating channel 63 when the electrolytic capacitor is bumped in special scenarios. At the same time, when too much gas is produced inside the second shell 70 and the pressure relief component 81 is opened, the gas enters the liquid storage chamber 64 storing the hydrogen scavenger through the through hole 62 and is absorbed.
[0053] In some embodiments of the present invention, the annular baffle 61 and the second shell 70 have the same shell thickness, which is convenient for welding. Of course, the annular baffle 61 and the second shell 70 may also have different shell thicknesses, as long as they can prevent the hydrogen remover from flowing out and effectively cooperate with the second shell 70.
[0054] Continue to refer to Figure 1 As shown, the first shell 60 is provided with a first injection port 65 connected to the liquid storage chamber 64 to achieve the replenishment of the liquid in the liquid storage chamber 64 .
[0055] In some embodiments of the present invention, the first injection port 65 is mainly used to inject hydrogen scavenger or hydrogen absorber into the liquid storage chamber 64 .
[0056] Continue to refer to Figure 1 As shown, the first shell 60 is also provided with a second injection port 66 connected to the liquid storage cavity 64 to achieve the supply of electrolyte required by the core package 50 .
[0057] In some embodiments of the present invention, the second injection port 66 is mainly used to cooperate with the through hole 62 to inject electrolyte into the accommodating channel 63, and enter the second shell 70 through the pressure relief component 81 to achieve timely replenishment of the electrolyte.
[0058] In some embodiments of the present invention, the first injection port 65 is disposed close to a side of the second shell 70 , that is, disposed on a side away from the through hole 62 , to facilitate the injection of the hydrogen remover.
[0059] In some embodiments of the present invention, the second injection port 66 is disposed on a side close to the through hole 62 , that is, on a side away from the second shell 70 , to facilitate the injection of the electrolyte.
[0060] In some embodiments of the present invention, the first injection port 65 and the second injection port 66 are both equipped with threads, nuts and gaskets. The nuts can be unscrewed and a syringe can be used to inject a dehydrogenating agent into the liquid storage chamber 64 and replenish the electrolyte through the receiving channel 63.
[0061] For example, a short syringe can be used to inject dehydrogenating agent into the liquid storage chamber 64 through the first injection port 65, and a long syringe can be used to inject electrolyte into the accommodating channel 63 through the second injection port 66 and the through hole 62, and then enter the second shell 70 through the pressure relief component 81, so as to achieve timely replenishment of the electrolyte.
[0062] In the embodiment of the utility model, the first injection port 65 can be used to timely replenish the dehydrogenating agent, and the second injection port 66 can be used to timely replenish the electrolyte, both of which can effectively extend the life of the electrolytic capacitor.
[0063] In some embodiments of the present invention, the shell wall provided with the first injection port 65 and the second injection port 66 may be thickened, that is, the shell wall thickness at the first injection port 65 and the second injection port 66 is increased to be more solid and durable.
[0064] In some embodiments of the present invention, the first shell 60 and the second shell 70 are both cylindrical structures, and the inner diameter of the first shell 60 is greater than or equal to the inner diameter of the second shell 70, and the overall structure is a cylindrical structure that is thick at the top and thin at the bottom or of equal thickness.
[0065] In some embodiments of the present invention, the first shell 60 and the second shell 70 are both made of aluminum to obtain an aluminum shell of an electrolytic capacitor.
[0066] In some embodiments of the present invention, the first shell 60 and the second shell 70 are integrally formed to facilitate assembly line processing operations.
[0067] In some embodiments of the present invention, in the vertical direction, the height of the first shell 60 is smaller than the height of the second shell 70, forming a design structure that is shorter at the top and longer at the bottom.
[0068] Exemplarily, the height ratio of the first shell 60 to the second shell 70 is (1-3):(6-9).
[0069] The height ratio provided by the utility model can be a value of an interval composed of any two values in the above range, for example, it can be (1-2): (6-9), or (1-3): (6-8), and so on. The height ratio provided by the utility model can also be one of 1:2, 1:3, 1:4, 1:6, 1:7, 1:8, 1:9, 2:7, 2:9, 3:7, 3:8, or any value that meets the above range.
[0070] In some embodiments of the present invention, the total height of the electrolytic capacitor housing may be 50 cm to 70 cm, for example, 50 cm, 60 cm, 70 cm or any value within the above range.
[0071] In some embodiments of the present invention, an explosion-proof component 67 is provided on the bottom wall of the first shell 60 away from the second shell 70 to cope with extreme situations.
[0072] Exemplarily, the explosion-proof component 67 may be an explosion-proof valve, which has a simple structure and is easy to assemble.
[0073] In some embodiments of the utility model, a sleeve 90 is also provided on at least part of the outer wall of the electrolytic capacitor housing. For example, the sleeve 90 can be provided on the second shell 70, or on the first shell 60, or on both the first shell 60 and the second shell 70, so as to protect the shell and print capacitor product information thereon.
[0074] In some embodiments of the present invention, the sleeve 90 is thermoplastic and can be wrapped around the outside of the shell by blowing hot air from a hair dryer, which is easy to operate.
[0075] Continue to refer to Figure 1 As shown, this embodiment also discloses an aluminum electrolytic capacitor, which includes the above-mentioned electrolytic capacitor housing and a core pack 50, wherein the core pack 50 is encapsulated in a second shell 70, and the liquid storage cavity 64 of the first shell 60 is used to fill the hydrogen remover.
[0076] In an embodiment of the present invention, the core package 50 is composed of cathode foil, anode foil and electrolytic paper, which are wound in the order of electrolytic paper, anode foil, electrolytic paper, cathode foil and electrolytic paper, and then fully impregnated with electrolyte under set conditions in an impregnation tank.
[0077] In an embodiment of the utility model, the aluminum electrolytic capacitor further includes a cover plate 10 , a lead 20 , a lead terminal 30 , and an aluminum washer 40 ; wherein the cover plate 10 is covered on an end of the second shell 70 away from the first shell 60 , and the lead 20 connects the core package 50 and the lead terminal 30 .
[0078] It is worth mentioning that the aluminum electrolytic capacitor in this embodiment can be a liquid aluminum electrolytic capacitor.
[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.
Claims
1. An electrolytic capacitor housing, characterized in that: It comprises a first shell and a second shell connected up and down, a partition plate is provided between the first shell and the second shell, and a pressure relief component is provided on the partition plate; A liquid storage chamber is provided inside the first shell, and a communicating accommodation channel is formed between the liquid storage chamber and the pressure relief component. The pressure relief component is configured to control opening and closing according to the internal pressure of the second shell to determine the connection and disconnection between the second shell and the accommodation channel.
2. The electrolytic capacitor housing according to claim 1, wherein: An annular baffle is sleeved inside the first shell, and the liquid storage cavity is formed between the annular baffle and the side wall of the first shell; the annular baffle, the partition plate and the bottom wall of the first shell away from the second shell together form the accommodating channel.
3. The electrolytic capacitor housing according to claim 2, wherein: The two opposite ends of the annular baffle along the axial direction are respectively connected to the partition plate and the bottom wall of the first shell away from the second shell, and at least one through hole is formed on the annular baffle.
4. The electrolytic capacitor housing according to claim 3, wherein: The through hole is opened at a side away from the second shell.
5. The electrolytic capacitor housing according to any one of claims 1 to 4, characterized in that: The first shell is provided with a first injection port connected to the liquid storage cavity, which is used to add hydrogen remover into the liquid storage cavity; The first shell is provided with a second injection port connected to the liquid storage cavity for replenishing electrolyte into the second shell.
6. The electrolytic capacitor housing according to claim 1, wherein: The pressure relief component includes a one-way valve structure.
7. The electrolytic capacitor housing according to claim 1, wherein: The first shell and the second shell are both cylindrical structures, and the inner diameter of the first shell is greater than or equal to the inner diameter of the second shell.
8. The electrolytic capacitor housing according to claim 1, wherein: The first shell and the second shell are both made of aluminum and are integrally formed.
9. The electrolytic capacitor housing according to claim 1, wherein: An explosion-proof component is provided on the bottom wall of the first shell away from the second shell.
10. An aluminum electrolytic capacitor, characterized in that: It comprises a core package and an electrolytic capacitor housing as claimed in any one of claims 1 to 9; wherein, The core package is packaged in the second shell, and the liquid storage cavity of the first shell is used to be filled with hydrogen remover.