Low-temperature-resistant aluminum electrolytic capacitor

Abstract

The utility model discloses a low temperature resistant aluminum electrolytic capacitor, which relates to the technical field of electrolytic capacitors, and comprises an aluminum shell, a core arranged in the aluminum shell and a cover plate arranged at an opening of the aluminum shell and used for sealing the opening, a sleeve is arranged outside the aluminum shell, a low temperature resistant cavity is arranged between the aluminum shell and the sleeve, and the low temperature resistant cavity is arranged in the aluminum shell. The low-temperature-resistant cavity is filled with an aluminum oxide ceramic layer, one side of the cover plate is fixedly connected with an insulating plate, the insulating plate is provided with a ventilation channel, and one end of the ventilation channel is arranged on one side of the cover plate. According to the utility model, the low-temperature-resistant cavity is arranged between the aluminum shell and the sleeve, the aluminum oxide ceramic layer is filled in the low-temperature-resistant cavity, and the aluminum oxide ceramic layer has good low-temperature performance, so that the electrolytic capacitor can still maintain good performance in a low-temperature environment; the insulating property between the capacitor and the circuit board can be effectively improved, and the risk of short circuit between the capacitor and the circuit board is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to electrolytic capacitor technical field, specifically a kind of low temperature resistant aluminum electrolytic capacitor. BACKGROUND

[0002] Aluminum electrolytic capacitor is made of anode aluminum foil by corrosion and oxide film formation, cathode aluminum foil by corrosion, winding with electrolyte in the middle, then impregnating working electrolyte, and then sealing in aluminum shell.Capacitor is a kind of energy storage element, used for tuning, filtering, coupling, bypass, energy conversion and time delay in circuit.Capacitor is usually called capacitor, which can be divided into fixed capacitor, semi-variable capacitor and variable capacitor.Aluminum electrolytic capacitor is widely used because of its self-healing characteristics during operation, high electric field strength of dielectric oxide film, high rated static capacity, and large capacity per unit volume.In recent years, with the rapid development of electronic component integration and high-speed processing technology, the continuous innovation of high-frequency technology of communication products and miniaturization and high-performance technology of mobile products, electronic information technology is changing rapidly, and the update speed of digital electronic products is getting faster and faster, which drives the growth of capacitor industry.

[0003] In the patent with Chinese patent publication No.CN113053671B, a soldering sheet type aluminum electrolytic capacitor is proposed.Through research on existing technology and the above-mentioned patent, it is found that the service life of existing capacitors is limited and easily affected by high temperature and low temperature extreme conditions.When the capacitor is affected by low temperature conditions, the capacitor effect is affected.Therefore, the utility model provides a low temperature resistant aluminum electrolytic capacitor. UTILITY MODEL CONTENT

[0004] TECHNICAL PROBLEM SOLVED

[0005] The utility model aims to make up for the shortcomings of the prior art, and provides a low temperature resistant aluminum electrolytic capacitor.

[0006] TECHNICAL SCHEME

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a low temperature resistant aluminum electrolytic capacitor, comprising an aluminum shell, a core arranged in the aluminum shell, and a cover plate installed at the opening of the aluminum shell for sealing the opening, the outside of the aluminum shell is provided with a sleeve, a low temperature resistant cavity is arranged between the aluminum shell and the sleeve, the inside of the low temperature resistant cavity is filled with an aluminum oxide ceramic layer, by arranging a low temperature resistant cavity between the aluminum shell and the sleeve, and filling the inside of the low temperature resistant cavity with an aluminum oxide ceramic layer, the low temperature resistance of the aluminum oxide ceramic layer is good, so that the electrolytic capacitor can still maintain good performance in low temperature environment.

[0008] One side of the cover plate is fixedly connected with an insulating plate, the insulating plate is provided with a ventilation passage, one end of the ventilation passage is arranged at one side of the cover plate, and the other end of the ventilation passage is arranged at the edge of the insulating plate, the device is provided with the insulating plate, the insulation performance between the capacitor and the circuit board can be effectively improved, the risk of short circuit of the capacitor and the circuit board is reduced, and the setting of the ventilation passage in the insulating plate can facilitate the effective and rapid release of the gas generated in the working process of the capacitor, the problem that, in the traditional close installation, the gas can only escape from the soldering pad, and long-term use can cause loosening and affect the installation strength of the capacitor is solved.

[0009] Preferably, the positive and negative terminal posts are fixedly installed on one side of the cover plate.

[0010] Preferably, the insulating plate is further provided with mounting holes for mounting the positive and negative terminal posts.

[0011] Preferably, the aluminum shell is internally provided with a cavity for mounting the core, and the cavity is further provided with electrolyte, and the core is soaked in the electrolyte.

[0012] Preferably, the core comprises electrolytic paper, cathode foil and anode foil, and the electrolytic paper, the cathode foil and the anode foil are arranged in a stack.

[0013] Preferably, the anode foil is connected with the positive terminal post, and the cathode foil is connected with the negative terminal post.

[0014] Beneficial effects:

[0015] Compared with the prior art, the low-temperature-resistant aluminum electrolytic capacitor has the following beneficial effects:

[0016] The low-temperature-resistant cavity is arranged between the aluminum shell and the sleeve, and the alumina ceramic layer is filled in the low-temperature-resistant cavity, the low-temperature resistance of the alumina ceramic layer is good, so that the electrolytic capacitor can still maintain good performance in a low-temperature environment, the device is provided with the insulating plate, the insulation performance between the capacitor and the circuit board can be effectively improved, the risk of short circuit of the capacitor and the circuit board is reduced, and the setting of the ventilation passage in the insulating plate can facilitate the effective and rapid release of the gas generated in the working process of the capacitor, the problem that, in the traditional close installation, the gas can only escape from the soldering pad, and long-term use can cause loosening and affect the installation strength of the capacitor is solved. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings described in the following are only some of the embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0018] Fig. 1 The structural schematic diagram of the present application is shown in the figure.

[0019] Fig. 2 The structural schematic diagram of the present application is shown in the figure.

[0020] Fig. 3 The structural schematic diagram of the present application is shown in the figure.

[0021] In the figure:

[0022] 1, aluminum shell; 2, core; 3, cover plate; 4, sleeve; 5, low-temperature-resistant cavity; 6, aluminum oxide ceramic layer; 7, insulation plate; 8, positive terminal; 9, negative terminal; 101, opening; 701, air passage; 702, mounting hole; 201, electrolytic paper; 202, cathode foil; 203, anode foil. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0024] Please refer to Figs. 1-3 The present application provides a technical solution: a low-temperature-resistant aluminum electrolytic capacitor, comprising an aluminum shell 1, a core 2 arranged in the aluminum shell 1, and a cover plate 3 arranged at the opening 101 of the aluminum shell 1 for sealing the opening 101. The aluminum shell 1 is externally provided with a sleeve 4, and a low-temperature-resistant cavity 5 is arranged between the aluminum shell 1 and the sleeve 4. The low-temperature-resistant cavity 5 is internally filled with an aluminum oxide ceramic layer 6. By arranging the low-temperature-resistant cavity 5 between the aluminum shell 1 and the sleeve 4, and filling the low-temperature-resistant cavity 5 with the aluminum oxide ceramic layer 6, the low-temperature resistance of the aluminum oxide ceramic layer is good, so that the electrolytic capacitor can still maintain good performance in a low-temperature environment.

[0025] One side of the cover plate 3 in the application is fixedly connected with an insulating plate 7, the insulating plate 7 is provided with a ventilation channel 701, one end of the ventilation channel 701 is arranged at one side of the cover plate 3, the other end of the ventilation channel 701 is arranged at the edge of the insulating plate 7, the device is provided with the insulating plate 7, the insulation performance between the capacitor and the circuit board can be effectively improved, the risk of short circuit of the capacitor and the circuit board is reduced, and the setting of the ventilation channel 701 in the insulating plate 7 can facilitate the effective and rapid release of the gas generated in the working process of the capacitor, solve the problem that in the traditional close installation, the gas can only escape from the soldering pad, and long-term use will cause loosening and affect the installation strength of the capacitor.

[0026] Please refer to Fig. 2 and Fig. 3 , one side of the cover plate 3 is fixedly installed with a positive pole terminal 8 and a negative pole terminal 9, and the inside of the insulating plate 7 is further provided with a mounting hole 702 for mounting the positive pole terminal 8 and the negative pole terminal 9.

[0027] Please refer to Fig. 2 , the inside of the aluminum shell 1 is provided with a cavity for mounting the core 2, and the cavity is further provided with an electrolyte, the core 2 is soaked in the electrolyte, the core 2 comprises electrolytic paper 201, cathode foil 202 and anode foil 203, the electrolytic paper 201, the cathode foil 202 and the anode foil 203 are arranged in layers, the anode foil 203 is connected with the positive pole terminal 8, and the cathode foil 202 is connected with the negative pole terminal 9.

[0028] Working principle: the low-temperature-resistant cavity 5 is arranged between the aluminum shell 1 and the sleeve 4, and the inside of the low-temperature-resistant cavity 5 is filled with an alumina ceramic layer 6, the alumina ceramic layer has good low-temperature resistance, so that the electrolytic capacitor can still maintain good performance in a low-temperature environment; the insulating plate 7 is arranged, the insulation performance between the capacitor and the circuit board can be effectively improved, the risk of short circuit of the capacitor and the circuit board is reduced, and the setting of the ventilation channel 701 in the insulating plate 7 can facilitate the effective and rapid release of the gas generated in the working process of the capacitor.

[0029] It should be noted that in this text, relational terms such as first and second are used merely to distinguish one entity or action from another, without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device.

[0030] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A low-temperature-resistant aluminum electrolytic capacitor comprising an aluminum case (1), a core (2) disposed in the aluminum case (1), and a cover plate (3) mounted at an opening (101) of the aluminum case (1) for sealing the opening (101), an outer portion of the aluminum case (1) being provided with a sleeve (4), characterized in that: The low-temperature-resistant cavity (5) is arranged between the aluminum shell (1) and the sleeve (4), and the inside of the low-temperature-resistant cavity (5) is filled with an aluminum oxide ceramic layer (6). One side of the cover plate (3) is fixedly connected with an insulating plate (7), the insulating plate (7) is provided with a ventilation channel (701), one end of the ventilation channel (701) is arranged on one side of the cover plate (3), and the other end of the ventilation channel (701) is arranged at the edge of the insulating plate (7).

2. A low temperature resistant aluminum electrolytic capacitor as claimed in claim 1, wherein: A positive electrode terminal (8) and a negative electrode terminal (9) are fixedly installed on one side of the cover plate (3).

3. The low temperature resistant aluminum electrolytic capacitor of claim 1, wherein: The insulating plate (7) is further provided with mounting holes (702) for mounting the positive electrode terminal (8) and the negative electrode terminal (9).

4. The low temperature resistant aluminum electrolytic capacitor of claim 1, wherein: The aluminum shell (1) is internally provided with a cavity for mounting the core (2), and the cavity is further provided with electrolyte, and the core (2) is soaked in the electrolyte.

5. The low temperature resistant aluminum electrolytic capacitor of claim 1, wherein: The core (2) comprises electrolytic paper (201), a cathode foil (202) and an anode foil (203), and the electrolytic paper (201), the cathode foil (202) and the anode foil (203) are arranged in layers.

6. A low temperature resistant aluminum electrolytic capacitor as claimed in claim 5, wherein: The anode foil (203) is connected with the positive electrode terminal (8), and the cathode foil (202) is connected with the negative electrode terminal (9).

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