Electrolytic capacitor, power supply device and electronic equipment

Abstract

The embodiment of the invention discloses an electrolytic capacitor, a power supply device and electronic equipment. The electronic equipment can be a server, a computer, a mobile phone, an electronic pen, a smart watch and the like. The power supply device can be a server power supply and the like. The electrolytic capacitor can specifically be an aluminum electrolytic capacitor, a tantalum electrolytic capacitor and the like. The electrolytic capacitor comprises a capacitor core and an electrode assembly, the electrode assembly is electrically connected with the capacitor core, the positions where the capacitor core is electrically connected with the electrode assembly are electrode connection positions, the number of the electrode connection positions is multiple, and at least part of the electrode connection positions are evenly distributed in the circumferential direction of the capacitor core at intervals. Therefore, the temperature returning uniformity of the electrolytic capacitor can be improved, the thermal stress can be reduced, the service life of the electrolytic capacitor can be prolonged, and the working stability can be improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of electrical accessories, and in particular to an electrolytic capacitor, a power supply device, and an electronic device. Background Art

[0002] Electrolytic capacitors, such as aluminum electrolytic capacitors and tantalum electrolytic capacitors, can continuously repair the defects of the metal foil during the process of continuous power-on heating to form an oxide film, making the capacitor have "self-healing" characteristics, thus being widely used. However, when used in a low-temperature environment, such as below -10°C or below -20°C, the uniformity of the temperature recovery of the electrolytic capacitor is poor, resulting in relatively large thermal stress inside the electrolytic capacitor, which may cause cracking of the metal foil and ultimately lead to breakdown failure of the electrolytic capacitor.

[0003] Therefore, how to provide a solution to overcome or alleviate the above-mentioned defects is still a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0004] The embodiments of the present application provide an electrolytic capacitor, a power supply device, and an electronic device, wherein the electrolytic capacitor can have better temperature recovery uniformity when used in a low-temperature environment, which is beneficial to ensuring working stability and service life.

[0005] In a first aspect, an embodiment of the present application provides an electrolytic capacitor, comprising a capacitor core and an electrode assembly, wherein the electrode assembly and the capacitor core are electrically connected, and the position where the capacitor core and the electrode assembly are electrically connected is an electrode connection position. There are multiple electrode connection positions, and at least some of the electrode connection positions are evenly spaced along the circumference of the capacitor core.

[0006] In the above-mentioned electrolytic capacitor, at least part of the electrode connection positions are evenly spaced around the circumference of the capacitor core. In this way, when used in a low-temperature environment, the uniformity of the distribution of the heating area formed by the electrode connection positions around the circumference of the capacitor core can be greatly improved, thereby improving the uniformity of the temperature recovery of the electrolytic capacitor, thereby reducing the thermal stress generated inside the electrolytic capacitor during the temperature recovery process, and thus ensuring the service life and working stability of the electrolytic capacitor.

[0007] The electrolytic capacitor may specifically be an aluminum electrolytic capacitor or a tantalum electrolytic capacitor.

[0008] In addition, the above-mentioned uniform spacing distribution refers to roughly uniform spacing distribution, rather than requiring absolutely equal spacing distribution, which allows a certain error. Specifically, it is assumed that P electrode connection positions are uniformly spaced in the circumferential direction, and the angle between the two adjacent electrode connection positions and the central axis of the capacitor core is between (1-f)*360 / P and (1+f)360 / P, which is considered to be uniformly spaced in the circumferential direction, where f can be between 5%-10%; it is assumed that the electrolytic capacitor has a total of W electrode connection positions, P≤W, that is, not all electrode connection positions may be uniformly spaced in the circumferential direction.

[0009] Based on the first aspect, the embodiment of the present application also provides a first implementation method of the first aspect: the electrode connection positions are all located on the same annular trajectory; or, the electrode connection positions are distributed on different annular trajectories; the cross-section of the outer wall of the capacitor core perpendicular to the axial direction is the reference trajectory, the annular trajectory and the reference trajectory are similar figures, and the annular trajectory and the reference trajectory are concentrically arranged.

[0010] In the first solution, each electrode connection position is located on the same annular track, which can easily realize the electrical connection between the capacitor core and the electrode assembly; in addition, for the following implementation method in which the electrode assembly includes an anode connector and a cathode connector, each electrode connection position is located on the same annular track, which can also facilitate the arrangement of the anode connector and the cathode connector in the shell. In the second solution, each electrode connection position can also be distributed on different annular tracks. In this case, the electrolytic capacitor can have more structural forms, and the structural forms can be more diversified.

[0011] Based on the first implementation of the first aspect, the embodiment of the present application also provides a second implementation of the first aspect: when the electrode connection positions are all located on the same annular track, the electrode connection positions are evenly spaced along the annular track. In this case, all electrode connection positions are evenly spaced in the circumferential direction, and the heating areas formed by the electrode connection positions are also evenly spaced in the circumferential direction of the capacitor core, which can ensure the uniformity of temperature recovery to a greater extent.

[0012] It should be understood that when the electrode connection positions are located on the same annular track, some of the electrode connection positions may not be evenly distributed. For example, when there are 5 electrode connection positions, 4 of them may be evenly spaced, while the other one may be arbitrarily set. In this case, the 4 evenly spaced electrode connection positions can already improve the uniformity of the temperature recovery.

[0013] Based on the first implementation manner of the first aspect, the embodiment of the present application also provides a third implementation manner of the first aspect: when the electrode connection positions are distributed on different annular tracks, the electrode connection positions of each annular track are uniformly spaced along the circumference of the capacitor core as a whole; and / or, the electrode connection positions on each annular track are uniformly spaced along the circumference of the capacitor core.

[0014] In the first solution, at least one electrode connection position may be provided on each annular track, and the electrode connection positions of each annular track are uniformly spaced along the circumference of the capacitor core as a whole. The electrode connection positions of each annular track are not aligned in the radial direction, and the electrode connection positions in each annular track are uniformly spaced along the circumference of the capacitor core as a whole. In this way, the electrode connection positions are still equivalent to being uniformly spaced along the circumference of the capacitor core, which is conducive to ensuring the uniformity of the temperature recovery of the electrolytic capacitor.

[0015] It should be noted that, in the present embodiment, the number and distribution of electrode connection positions on a single annular track are not limited; for any annular track, if a plurality of electrode connection positions are arranged thereon, the electrode connection positions on the single annular track may be evenly spaced or unevenly spaced along the circumferential direction, as long as it can be ensured that all electrode connection positions on each annular track are evenly spaced along the circumferential direction as a whole.

[0016] In the second scheme, each annular track is provided with a plurality of electrode connection positions, and the plurality of electrode connection positions on each annular track can be evenly spaced. In this way, a plurality of evenly distributed heating areas can be formed on each annular track, and different annular tracks can generate heat in a plurality of radial areas of the capacitor core, which is also beneficial for improving the uniformity of the temperature recovery of the capacitor core.

[0017] In this scheme, the electrode connection positions of each annular track are not aligned in the radial direction. Moreover, the electrode connection positions in each annular track are not evenly spaced in the circumferential direction as a whole. In other words, assuming that there are a total of W electrode connection positions in this scheme, then these W electrode connection positions are divided into M groups, each group includes multiple electrode connection positions, the number of annular tracks = M, and the electrode connection positions of each group are evenly distributed on an annular track, but these W electrode connection positions are not evenly spaced in the circumferential direction as a whole. This scheme is an example of some electrode connection positions being evenly spaced in the circumferential direction.

[0018] In the third solution, each annular track is provided with the same number of multiple electrode connection positions, and the multiple electrode connection positions on each annular track can be evenly spaced, and the electrode connection positions on different annular tracks are aligned one by one in the radial direction. In this way, multiple evenly distributed heating areas can be formed on each annular track, and the heating areas on each annular track are aligned in the radial direction, which is also conducive to improving the uniformity of the temperature recovery of the capacitor core.

[0019] In this solution, not all electrode connection positions are evenly spaced in the circumferential direction. Therefore, this solution is also an example in which some electrode connection positions are evenly spaced in the circumferential direction.

[0020] Based on the first aspect, or based on the first embodiment or the third embodiment of the first aspect, the embodiment of the present application also provides a fourth embodiment of the first aspect: the electrode assembly includes an anode pin and a cathode pin, the capacitor core includes an anode portion and a cathode portion, the anode pin is electrically connected to the anode portion, the cathode pin is electrically connected to the cathode portion, the position where the anode portion and the anode pin are electrically connected is the anode connection position, the position where the cathode portion and the cathode pin are electrically connected is the cathode connection position, and the electrode connection positions include an anode connection position and a cathode connection position.

[0021] In this embodiment, the electrode assembly only includes an anode pin and a cathode pin, and both the anode pin and the cathode pin are directly connected to the capacitor core, and the structure is relatively simple.

[0022] Based on the fourth implementation of the first aspect, the embodiment of the present application further provides a fifth implementation of the first aspect: the anode pin and the anode part are an integrally formed one-piece structure, and the cathode pin and the cathode part are an integrally formed one-piece structure. Specifically, the anode pin can be formed by protruding along the axial direction at a local position of the anode part, and the cathode pin can be formed by protruding along the axial direction at a local position of the cathode part. In this way, there is no connection structure between the anode pin, the cathode pin and the capacitor core, and the structural form of the electrolytic capacitor can be simpler.

[0023] In addition, the anode pin, cathode pin and capacitor core can be of split structure. In this case, the anode pin and cathode pin can be prepared separately and then assembled to the capacitor core to facilitate adjusting the installation position of the anode pin and cathode pin. The specific assembly method can be to install the anode pin and cathode pin to the anode part and cathode part of the capacitor core when the capacitor core is wound.

[0024] Based on the fourth implementation method of the first aspect, the embodiment of the present application also provides a sixth implementation method of the first aspect: the electrode assembly also includes an anode connector and a cathode connector, the anode pin is electrically connected to the anode part through the anode connector, and the cathode pin is electrically connected to the cathode part through the cathode connector.

[0025] In this embodiment, the anode pin and the anode part are connected through an anode connector, and the cathode pin and the cathode part are connected through a cathode connector. In this way, the setting positions of the anode pin and the cathode pin are not affected by the anode connection position and the cathode connection position, and the freedom of product design can be higher.

[0026] The anode connector and the cathode connector may specifically be metal wires, or metal plates, etc., as long as they can achieve the technical purpose of electrical connection.

[0027] In a second aspect, an embodiment of the present application also provides an electrolytic capacitor, comprising an anode portion and a cathode portion, wherein the anode portion and the cathode portion are wound to form a capacitor core, the anode portion has an anode unit protruding from the capacitor core, and the cathode portion has a cathode unit protruding from the capacitor core, the anode unit and the cathode unit constitute an electrode assembly of the electrolytic capacitor, and the anode unit and the cathode unit form full coverage along the circumference of the capacitor core.

[0028] In the above scheme, the anode unit and the cathode unit can form full coverage on the circumference of the capacitor core, so that the heating area formed by the anode unit and the cathode unit can be distributed on the entire circumference of the capacitor core, which can better achieve uniform heat recovery for the electrolytic capacitor.

[0029] The electrolytic capacitor may specifically be an aluminum electrolytic capacitor or a tantalum electrolytic capacitor.

[0030] In one embodiment, the anode unit and the cathode unit are both annular. In this way, the anode unit and the cathode unit can form full coverage in the circumferential direction of the capacitor core, and the anode unit and the cathode unit can form two heating areas in the radial direction of the capacitor core, which is more conducive to the rapid and uniform heat recovery of the capacitor core.

[0031] In another implementation, both the anode unit and the cathode unit can be part of a ring. In this case, as long as the first circumferential coverage area of ​​the anode unit and the second circumferential coverage area of ​​the cathode unit are matched, full coverage along the circumference of the capacitor core can be achieved.

[0032] In a third aspect, an embodiment of the present application further provides a power supply device, comprising a capacitor, which is an electrolytic capacitor involved in the first aspect, or any one of the various embodiments of the first aspect, or the second aspect, or any one of the various embodiments of the second aspect.

[0033] Since the aforementioned electrolytic capacitor can have relatively good temperature recovery uniformity in a low temperature environment, the electrolytic capacitor is not easily damaged due to internal thermal stress when used in a low temperature environment, has higher working stability and longer life. Accordingly, the power supply device equipped with the electrolytic capacitor can also have a relatively long service life and relatively high working stability.

[0034] The power supply device may specifically be various forms of power supply equipment such as a server power supply.

[0035] In a fourth aspect, an embodiment of the present application further provides an electronic device, comprising a circuit board and a capacitor disposed on the circuit board, wherein the capacitor is an electrolytic capacitor as described in the first aspect, or any one of the various embodiments of the first aspect, or the second aspect, or any one of the various embodiments of the second aspect.

[0036] Since the aforementioned electrolytic capacitor can have relatively good temperature recovery uniformity in a low temperature environment, the electrolytic capacitor is not easily damaged due to internal thermal stress when used in a low temperature environment, has higher working stability and longer life. Accordingly, electronic equipment equipped with the electrolytic capacitor can also have a relatively long service life and relatively high working stability.

[0037] The electronic device may specifically be a server, a computer, a mobile phone, an electronic pen, a smart watch, etc., which is provided with a circuit component inside, and the circuit component may include the above-mentioned electrolytic capacitor. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A schematic diagram of a structure of an implementation method of an electrolytic capacitor provided in an embodiment of the present application;

[0039] Figure 2 for Figure 1 The structural diagram of the capacitor core;

[0040] Figure 3 It is a schematic diagram when the anode part and the anode pin are an integrated structure;

[0041] Figure 4 for Figure 1 A diagram of a first electrical connection structure between the middle electrode assembly and the capacitor core;

[0042] Figure 5 for Figure 1 A second electrical connection structure diagram of the middle electrode assembly and the capacitor core;

[0043] Figure 6 for Figure 1 A third electrical connection structure diagram of the middle electrode assembly and the capacitor core;

[0044] Figure 7 for Figure 1 A fourth electrical connection structure diagram of the middle electrode assembly and the capacitor core;

[0045] Figure 8 for Figure 1 A fifth electrical connection structure diagram of the middle electrode assembly and the capacitor core;

[0046] Fig. 9 It is a diagram of the electrical connection structure of the electrode assembly and the capacitor core in the related art;

[0047] Fig.10 A schematic diagram of the structure of another implementation method of the electrolytic capacitor provided in the embodiment of the present application;

[0048] Fig.11 for Fig.10 A structural schematic diagram of a capacitor core;

[0049] Fig.12 for Fig.10 Another structural diagram of the capacitor core. DETAILED DESCRIPTION

[0050] In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0051] In the description of the embodiments of the present application, the terms "include", "comprises" 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 includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0052] In the description of the embodiments of the present application, the term "plurality" refers to two or more. Moreover, when "plurality" is used to describe the number of different components, it does not indicate the relationship between the components in terms of quantity.

[0053] In the description of the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0054] Please refer to Figure 1-Figure 9 , Figure 1 A schematic diagram of a structure of an implementation method of an electrolytic capacitor provided in an embodiment of the present application. Figure 2for Figure 1 Schematic diagram of the structure of the capacitor core. Figure 3 This is a schematic diagram of the anode portion and the anode pin being an integrated structure. Figure 4 for Figure 1 The first electrical connection structure diagram of the electrode assembly and the capacitor core, Figure 5 for Figure 1 The second electrical connection structure diagram of the middle electrode assembly and the capacitor core, Figure 6 for Figure 1 The third electrical connection structure diagram of the electrode assembly and the capacitor core, Figure 7 for Figure 1 The fourth electrical connection structure diagram of the middle electrode assembly and the capacitor core, Figure 8 for Figure 1 The fifth electrical connection structure diagram of the electrode assembly and the capacitor core, Fig. 9 This is a diagram of the electrical connection structure of the electrode assembly and the capacitor core in the related art.

[0055] like Figure 1 and Figure 2 As shown, an embodiment of the present application relates to an electrolytic capacitor, including a shell 1, a capacitor core 2 and an electrode assembly 3.

[0056] The housing 1 is an external packaging structure of the electrolytic capacitor, which is used to encapsulate the electronic devices (such as the capacitor core 2) in the electrolytic capacitor, so as to integrate and assemble these electronic devices, thereby facilitating the overall transportation and assembly of the electrolytic capacitor. In addition, the housing 1 can protect the electronic devices inside it, and can reduce the damage to the electronic devices caused by factors such as collision during transportation, installation and use. In addition, the housing 1 also forms the outer contour of the electrolytic capacitor and basically determines the overall shape of the electrolytic capacitor. In some implementations, the housing 1 can be roughly a circular cylindrical structure. In other implementations, the housing 1 can also be a cylindrical structure of other structural forms, such as a square cylinder, etc., which needs to be determined in combination with actual use requirements.

[0057] The capacitor core 2 is the main component of the electrolytic capacitor. Figure 2 As shown, the capacitor core 2 can be formed by winding an anode portion 21, a cathode portion 22 and an electrolytic paper 23. The anode portion 21 and the cathode portion 22 are both made of metal. Depending on the type of electrolytic capacitor, the materials of the anode portion 21 and the cathode portion 22 may also be different. For example, when the electrolytic capacitor is an aluminum electrolytic capacitor, the anode portion 21 and the cathode portion 22 may both be aluminum foil; when the electrolytic capacitor is a tantalum electrolytic capacitor, the anode portion 21 and the cathode portion 22 may both be tantalum foil.

[0058] Taking the electrolytic capacitor as an aluminum electrolytic capacitor as an example, during the specific preparation, the aluminum foil can be placed in a solution containing chlorides, etc. for etching to increase the surface area of ​​the aluminum foil, thereby increasing the capacitance of the capacitor; the aluminum foil used to produce the anode part 21 usually also undergoes a chemical formation treatment to generate an electrolyte oxide layer (Al2O3) on the surface of the aluminum foil. The specific chemical formation treatment method can be to place the aluminum foil in an ammonium borate solution and apply a certain voltage to form a dielectric oxide layer on the surface of the aluminum foil; the electrolytic paper 23 can isolate the anode part 21 and the cathode part 22, and the electrolytic paper 23 is soaked in electrolyte. The electrolytic paper 23 can also play a role in balancing the distribution of the electrolyte; the electrolyte is a true cathode, which plays a role in connecting the electrolyte oxide layer on the surface of the anode part 21. The type of electrolyte is related to the type of electrolytic capacitor and is not limited here. The electrolyte contains a certain amount of water. When a local electrolyte oxide layer is damaged due to long-term use or manufacturing defects, a leakage current may be generated at the damaged location. Under the action of the leakage current, the water in the electrolyte may decompose to form oxygen and hydrogen. The oxygen may react with the aluminum foil at the damaged location to generate a new electrolyte oxide layer, thereby achieving a self-healing effect.

[0059] Part of the electrode assembly 3 may be located outside the housing 1 for connection with an external device, which may be a circuit board, such as a motherboard of an electronic device in the form of a server, or a circuit board in a device such as a power supply device. The electrode assembly 3 may include an anode pin 31 and a cathode pin 32, wherein the anode pin 31 may be electrically connected to the anode portion 21 of the capacitor core 2, and the cathode pin 32 may be electrically connected to the cathode portion 22 of the capacitor core 2.

[0060] In some implementations, the electrode assembly 3 may include only an anode pin 31 and a cathode pin 32. The anode pin 31 may be directly connected to the anode portion 21, and the cathode pin 32 may be directly connected to the cathode portion 22.

[0061] In one solution, the anode pin 31, the cathode pin 32 and the capacitor core 2 are split structures. The anode pin 31 and the cathode pin 32 can be directly installed on the anode part 21 and the cathode part 22 during winding, and the specific installation method can be welding, etc., to ensure the reliable connection between the anode pin 31 and the anode part 21, and the reliable connection between the cathode pin 32 and the cathode part 22. In this implementation, the anode pin 31 and the cathode pin 32 are partially located in the housing 1, and partially extend out of the housing 1.

[0062] In another solution, Figure 3As shown, the anode pin 31 and the anode part 21 may also be an integral structure, and the anode pin 31 may be formed by the anode part 21 protruding partially along the axial direction of the capacitor core 2. Similarly, the cathode pin 32 and the cathode part 22 may also be an integral structure, and the cathode pin 32 may be formed by the cathode part 22 protruding partially along the axial direction of the capacitor core 2. In this solution, the anode pin 31 and the anode part 21 may be naturally connected, and the cathode pin 32 and the cathode part 22 may be naturally connected. There is no need to set a connection structure in the form of solder between the anode pin 31 and the anode part 21, and between the cathode pin 32 and the cathode part 22. The structure of the electrolytic capacitor can be simpler, and the processing and preparation of the electrolytic capacitor can also be easier.

[0063] In some other implementations, the electrode assembly 3 may include, in addition to the anode pin 31 and the cathode pin 32, a connector. The anode pin 31 and the cathode pin 32 may be indirectly connected to the capacitor core 2 via the connector.

[0064] In detail, Figure 1 As shown, the connector may include an anode connector 33 and a cathode connector 34, and both the anode connector 33 and the cathode connector 34 may be conductors in the form of metal wires, metal plates, etc.; one end of the anode connector 33 may be electrically connected to the anode portion 21, and specifically, it may be electrically connected to the anode portion 21 when winding, and the other end of the anode connector 33 may be electrically connected to the anode pin 31, and the specific electrical connection method may be welding, etc.; one end of the cathode connector 34 may be electrically connected to the cathode portion 22, and specifically, it may be electrically connected to the cathode portion 22 when winding, and the other end of the cathode connector 34 may be electrically connected to the cathode pin 32, and the specific electrical connection method may be welding, etc. In this implementation, the anode pin 31 and the cathode pin 32 may all be located on the outside of the shell 1, and of course, some of them may also be located on the inside of the shell 1, which is specifically related to the structural form of the connector.

[0065] For ease of description, in an embodiment of the present application, the connection position of the electrode assembly 3 and the capacitor core 2 may be referred to as an electrode connection position 24, and the electrode connection position 24 may include an anode connection position 241 and a cathode connection position 242. The number of anode connection positions 241 and cathode connection positions 242 may be consistent, or the number of anode connection positions 241 and cathode connection positions 242 may be different, which may be determined according to actual needs. It should be understood that the electrode connection position 24 mentioned below may be formed by directly connecting the anode pin 31 (cathode pin 32) to the anode portion 21 (cathode portion 22), or may be formed by connecting the anode pin 31 (cathode pin 32) to the anode portion 21 (cathode portion 22) through the anode connector 33 (cathode connector 34).

[0066] In related technologies, such as Fig. 9 As shown, there are two electrode connection positions 24', and the two electrode connection positions 24' are usually close to each other in the circumferential direction. In this way, when used in a low temperature environment below -10°C or below -20°C, the temperature recovery uniformity of the electrolytic capacitor is poor, which is specifically manifested in that a high temperature zone M' will be formed in the area where the two electrode connection positions 24' are located, and then the heat will diffuse from the high temperature zone M' to other areas. However, when the heat of the high temperature zone M' diffuses to other areas, for example, when it diffuses to the opposite side area N' of the two electrode connection positions 24', thermal stress will be generated to squeeze the opposite side area N', which may cause cracking of the aluminum foil, and may eventually cause the electrolytic capacitor to fail due to breakdown, affecting the service life of the electrolytic capacitor.

[0067] In view of this, in the embodiment of the present application, the number of electrode connection positions 24 at which the capacitor core 2 and the electrode assembly 3 are electrically connected can be multiple, and among the electrode connection positions 24, at least part of the electrode connection positions 24 can be evenly spaced along the circumference of the capacitor core 2. In this way, when used in a low-temperature environment, the uniformity of the distribution of the heating area formed by the electrode connection positions 24 in the circumference of the capacitor core 2 can be greatly improved, thereby improving the uniformity of the temperature recovery of the electrolytic capacitor, reducing the thermal stress generated inside the electrolytic capacitor during the temperature recovery process, and further ensuring the service life and working stability of the electrolytic capacitor.

[0068] It should be noted that the above-mentioned "at least part" means that only a part of the electrode connection positions 24 can be evenly spaced in the circumferential direction (which can be understood as the circumferential direction of the capacitor core 2), and the electrode connection positions 24 evenly spaced in this part allow multiple evenly spaced positions in the circumferential direction of the electrolytic capacitor to heat and recover temperature at the same time, that is, it can effectively improve the uniformity of the recovery temperature of the electrolytic capacitor, and the remaining electrode connection positions 24 can be set as needed. Of course, all the electrode connection positions 24 can also be evenly spaced in the circumferential direction, which can more effectively ensure the uniformity of the recovery temperature of the electrolytic capacitor.

[0069] In addition, the above-mentioned uniformly spaced distribution refers to a roughly uniformly spaced distribution, rather than requiring an absolutely equally spaced distribution, which allows a certain error. Specifically, it is set that P electrode connection positions 24 are uniformly spaced in the circumferential direction, and two adjacent electrode connection positions 24 in the circumferential direction and the central axis of the capacitor core 2 are perpendicular. The angle between the two perpendicular lines is between (1-f)*360 / P and (1+f)360 / P, that is, it is considered to be uniformly spaced in the circumferential direction, where f can be between 5%-10%; combined with the aforementioned description of "at least part of the description", it is set that the electrolytic capacitor has a total of W electrode connection positions 24, P≤W, that is, the P electrode connection positions 24 here refer to the number of electrode connection positions 24 uniformly spaced in the circumferential direction.

[0070] In one implementation, each electrode connection position 24 may be located on the same annular track 25. In this case, each electrode connection position 24 may be evenly spaced along the annular track 25 to ensure that the heating area formed by each electrode connection position 24 is evenly distributed in the circumferential direction of the capacitor core 2. In addition, since each electrode connection position 24 is located on the same annular track 25, the electrical connection between the capacitor core 2 and the electrode assembly 3 can be easily achieved. For a solution in which the electrode assembly 3 includes an anode connector 33 and a cathode connector 34, the arrangement of the anode connector 33 and the cathode connector 34 in the housing 1 can also be facilitated.

[0071] The cross section of the outer wall of the capacitor core 2 perpendicular to the axial direction is taken as the reference track 26. The annular track 25 and the reference track 26 are similar figures, and the annular track 25 and the reference track 26 can be arranged concentrically. It should be understood that the "similar figures" here are mathematical concepts, which refer to figures with the same shape. Figure 4-Figure 7 In the implementation of the attached figure, the reference track 26 and the annular track 25 may be concentric circles. In some other implementations of the embodiment of the present application, the reference track 26 and the annular track 25 may also be other shapes, for example, both may be rectangles, triangles or other complex shapes.

[0072] As mentioned above, in the actual preparation process, the anode part 21 and the cathode part 22 are both formed into the capacitor core 2 by winding, so the cross-sections of the anode part 21 and the cathode part 22 in the capacitor core 2 perpendicular to the axial direction can be roughly involute-shaped. For the convenience of description, the cross-section of the anode part 21 perpendicular to the axial direction can be called the anode involute, and any section of the anode involute with a central angle of 360 degrees can be called an anode circle. Since the two ends of the anode circle are not connected, the anode circle is not a closed figure, but is basically equivalent to a circle; similarly, the cross-section of the cathode part 22 perpendicular to the axial direction can be called the cathode involute, and any section of the cathode involute with a central angle of 360 degrees can be called a cathode circle. Since the two ends of the cathode circle are not connected, the cathode circle is not a closed figure, but is basically equivalent to a circle; in this way, the cross-sections of the anode part 21 and the cathode part 22 in the capacitor core 2 perpendicular to the axial direction can be understood as multiple nested anode circles and cathode circles. In the embodiment of the present application, the annular trajectory 25 is actually an annular area, which can cover an adjacent cathode circle and an anode circle. The anode connection position 241 located on the annular trajectory 25 can be located on the anode circle covered by the annular trajectory 25, and the cathode connection position 242 located on the annular trajectory 25 can be located on the cathode circle covered by the annular trajectory 25; considering that the thickness of the anode part 21 and the cathode part 22 used to prepare the capacitor core is very thin, taking aluminum electrolytic capacitors as an example, the thickness of the aluminum foil used to prepare the anode part 21 and the cathode part 22 is usually only a few microns (for example, it can be between 4μm-6μm), therefore, the above-mentioned annular trajectory 25 can basically be equivalent to a line.

[0073] In this implementation, the number of electrode connection positions 24 may be two. For details of this solution, see Figure 4 In this case, one of the two electrode connection positions 24 is an anode connection position 241, and the other is a cathode connection position 242. Alternatively, the number of electrode connection positions 24 may be three, four or more, wherein: Figure 5 A scheme in which there are four electrode connection locations 24 is shown.

[0074] When the number of electrode connection positions 24 is an even number, the number of anode connection positions 241 and cathode connection positions 242 may be equal. Taking the number of electrode connection positions 24 as four as an example, two of the electrode connection positions 24 may be anode connection positions 241, and the other two electrode connection positions 24 may be cathode connection positions 242. In some examples, the two anode connection positions 241 and the two cathode connection positions 242 may be arranged alternately along the annular track 25. This solution can be seen in Figure 5, at this time, each anode connection position 241 is provided with a cathode connection position 242 on both sides of the circumference, and each cathode connection position 242 is provided with two anode connection positions 241 on both sides of the circumference. In other examples, the two anode connection positions 241 and the two cathode connection positions 242 can also be centrally arranged respectively. At this time, the two anode connection positions 241 can be arranged adjacent to each other in the circumferential direction, and the two cathode connection positions 242 can be arranged adjacent to each other in the circumferential direction. In this way, the electrical connection between each anode connection position 241 and the anode pin 31 and the electrical connection between each cathode connection position 242 and the cathode pin 32 can be facilitated. Of course, the arrangement of each electrode connection position 24 is not limited to the above-mentioned alternating arrangement and centralized arrangement. In practical applications, those skilled in the art can also flexibly adjust according to specific needs, as long as the uniformity of the arrangement of each electrode connection position 24 can be guaranteed.

[0075] When the number of electrode connection positions 24 is an odd number, the number of anode connection positions 241 and cathode connection positions 242 may be unequal. Taking the number of electrode connection positions 24 as 3 as an example, the number of one of anode connection positions 233 and cathode connection positions 242 may be two, and the number of the other of anode connection positions 241 and cathode connection positions 242 may be one. The arrangement of the electrode connection positions 24 may be the aforementioned alternating arrangement or the aforementioned centralized arrangement, which is specifically related to the number of anode connection positions 241 and cathode connection positions 242 and actual use needs.

[0076] In another implementation, each electrode connection position 24 may also be located on at least two different annular tracks 25. In the direction in which the central axis of the capacitor core 2 points to the outer wall of the capacitor core 2 (hereinafter referred to as the radial direction of the capacitor core 2), each annular track 25 may be spaced apart from each other. In this way, the heating areas formed by each electrode connection position 24 may also be spaced apart in the radial direction of the capacitor core 2, which is more conducive to improving the uniformity of the temperature recovery of the capacitor core 2 when used in a low temperature environment.

[0077] In one solution, the electrode connection positions 24 located in different annular tracks 25 may not be aligned in the radial direction, that is, the electrode connection positions 24 located in different annular tracks 25 are not in the same radial direction. However, all the electrode connection positions 24 on each annular track 25 may be evenly spaced and distributed in the circumferential direction as a whole to ensure that the heating areas formed by each electrode connection position 24 are evenly distributed in the circumferential direction. For example, Figure 6As shown, two annular tracks 25 are each provided with two electrode connection positions 24, and the two electrode connection positions 24 on each annular track 25 are not evenly spaced in the circumferential direction, but the four electrode connection positions 24 on the two annular tracks 25 can be evenly spaced in the circumferential direction as a whole. Specifically, Figure 6 Two anode connection positions 241 are arranged on the annular track 25 close to the central axis, and the two anode connection positions 241 are not evenly spaced on the annular track 25 where they are located; Figure 6 Two cathode connection positions 242 are arranged on the annular track 25 far away from the central axis, and the two cathode connection positions 242 are not evenly spaced on the annular track 25 where they are located, but the two anode connection positions 241 and the two cathode connection positions 242 are evenly spaced as a whole in the circumferential direction of the capacitor core 2.

[0078] It should be noted that, in the present solution, it is not required to set a plurality of electrode connection positions 24 on each annular track 25, that is, there may be only one electrode connection position 24 on a certain annular track 25, which is also feasible. In addition, the present solution does not limit the distribution of the electrode connection positions 24 on each annular track 25. For a single annular track 25, the electrode connection positions 24 thereon may be evenly spaced or unevenly spaced along the single annular track 25, as long as all the electrode connection positions 24 on each annular track 25 are evenly spaced as a whole in the circumferential direction.

[0079] In another embodiment, each annular track 25 may be provided with a plurality of electrode connection positions 24, and the plurality of electrode connection positions 24 on each annular track 25 may be evenly spaced to ensure the uniformity of the distribution of the electrode connection positions 24 on each annular track 25. In this embodiment, the electrode connection positions 24 located on different annular tracks 25 are not aligned in the radial direction. In this embodiment, all the electrode connection positions 24 of each annular track 25 are unevenly spaced in the circumferential direction, so this embodiment belongs to the case of partially evenly spaced distribution.

[0080] For example, Figure 7 As shown, each annular track 25 is provided with four electrode connection positions 24, and the four electrode connection positions 24 of each annular track 25 can be evenly spaced in the circumferential direction, and the eight electrode connection positions 24 on the two annular tracks 25 are not evenly spaced in the circumferential direction as a whole. In addition, the electrode connection positions 24 in the two annular tracks 25 are not aligned in the radial direction. Figure 7 In the example, two groups of electrode connection positions 24 that can be evenly spaced are included, and the four electrode connection positions 24 in each group are evenly spaced in the circumferential direction. Specifically, Figure 7 Four electrode connection positions 24 are arranged on the annular track 25 close to the central axis, and the four electrode connection positions 24 are evenly spaced on the annular track 25 where they are located; Figure 7 Four electrode connection positions 24 are arranged on the annular track 25 far away from the central axis, and the four electrode connection positions 24 are also evenly spaced on the annular track 25 where they are located, but the eight electrode connection positions 24 are unevenly spaced as a whole in the circumferential direction of the capacitor core 2.

[0081] In this solution, it is not required that the number of electrode connection positions 24 on each annular track 25 be the same, that is, the number of electrode connection positions 24 on each annular track 25 may be different.

[0082] In another embodiment, the electrode connection positions 24 located in different annular tracks 25 can be aligned in the radial direction, that is, the electrode connection positions 24 in different annular tracks 25 can be aligned and arranged one by one. The electrode connection positions 24 of each annular track 25 are evenly spaced in the circumferential direction. This embodiment can be seen in Figure 8 At this time, the number of electrode connection positions 24 of each annular track 25 should be consistent. Figure 8 In the example, two groups of electrode connection positions 24 that can be evenly spaced are also included, and the four electrode connection positions 24 in each group are evenly spaced in the circumferential direction; or Figure 8 The two electrode connection positions 24 aligned radially in the middle are grouped together, then, Figure 8 The middle solution can also be understood as the four groups of electrode connection positions 24 being evenly spaced and distributed in the circumferential direction.

[0083] In this solution, all the electrode connection positions 24 on each annular track 25 are not evenly spaced in the circumferential direction. Therefore, this solution also belongs to the case of partially evenly spaced distribution.

[0084] In addition, the scheme of partial uniform spacing distribution may also include other situations. For example, it is assumed that there are a total of W electrode connection positions 24, of which P are uniformly spaced, and these P can be distributed in one annular track 25 or in multiple annular tracks 25, and the remaining (WP) electrode connection positions 24 can be set arbitrarily.

[0085] Please refer to Figure 10-12 , Fig.10 This is a schematic diagram of another implementation of the electrolytic capacitor provided in the embodiment of the present application. Fig.11 for Fig.10 A structural diagram of the capacitor core. Fig.12 for Fig.10 Another structural diagram of the capacitor core.

[0086] like Figure 10-12 As shown, the embodiment of the present application also provides another electrolytic capacitor, which includes a housing 1, a capacitor core 2 and an electrode assembly. In this implementation, the anode portion 21 and the cathode portion 22 can be wound to form the capacitor core 2, the anode portion 21 also has an anode unit 35 protruding from the capacitor core 2, and the cathode portion 22 also has a cathode unit 36 ​​protruding from the capacitor core 2. The anode unit 35 and the cathode unit 36 ​​can be combined to form an electrode assembly of the electrolytic capacitor, and the anode unit 35 and the cathode unit 36 ​​can both extend out of the housing 1 for connection with external devices. In addition, in the embodiment of the present application, the anode unit 35 has a first circumferential coverage area, and the cathode unit 36 ​​has a second circumferential coverage area. The first circumferential coverage area and the second circumferential coverage area can form full coverage along the circumference of the capacitor core 2.

[0087] In this way, the heating area formed by the anode unit 35 and the cathode unit 36 ​​can be distributed in the entire circumference of the capacitor core 2, which can better achieve uniform heat recovery for the electrolytic capacitor. In addition, in this embodiment, the anode unit 35 is formed by the anode part 21, and the cathode unit 36 ​​is formed by the cathode part 22, so the structure can be simpler and the processing and preparation can be relatively easy.

[0088] like Fig. 9 As shown, in some implementations, the anode unit 35 and the cathode unit 36 ​​may both be annular, so that the first circumferential coverage area and the second circumferential coverage area may both form full coverage along the circumference of the capacitor core 2 .

[0089] like Fig.10 As shown, in other implementations, the anode unit 35 and the cathode unit 36 ​​can both be part of a ring. In this case, as long as the first circumferential coverage area of ​​the anode unit 35 and the second circumferential coverage area of ​​the cathode unit are matched, full coverage along the circumference of the capacitor core 2 can be achieved. Taking the anode unit 35 and the cathode unit 36 ​​as arc plates as an example, the center angle corresponding to the first circumferential coverage area can be recorded as α, and the center angle corresponding to the second circumferential coverage area can be recorded as β. α and β can satisfy the following relationship: α+β≥360°, and there can be an overlapping area between the first circumferential coverage area and the second circumferential coverage area.

[0090] In this embodiment, the anode unit 35 and the cathode unit 36 ​​can be sealed with the housing 1 by means of glue injection, and the glue injection method can also improve the structural strength of the anode unit 21 and the cathode unit 36.

[0091] The embodiment of the present application further provides a power supply device, which can be a power supply device of various forms such as a server power supply, etc. The power supply device includes a capacitor, which can be an electrolytic capacitor involved in the above-mentioned embodiments.

[0092] Since the electrolytic capacitors in the embodiments of the present application can have relatively good temperature recovery uniformity in a low temperature environment, the electrolytic capacitors are not easily damaged by internal thermal stress when used in a low temperature environment, and have high working stability and long life. Accordingly, the power supply device including the electrolytic capacitors can also have a relatively long service life and relatively high working stability.

[0093] The embodiment of the present application also provides an electronic device, which can be a server, a computer, a mobile phone, an electronic pen, a smart watch, etc. Taking the electronic device as a server as an example, the electronic device can include a chassis, and various electronic devices such as a circuit board, a chip, and a fan are arranged inside the chassis. In addition, a capacitor is also arranged inside the chassis, and the capacitor can be installed in the circuit board or other circuit components. In some implementations, the electronic device includes a circuit board and a capacitor arranged on the circuit board, and the capacitor can be specifically an electrolytic capacitor involved in the aforementioned embodiments.

[0094] Since the electrolytic capacitors in the embodiments of the present application can have relatively good temperature recovery uniformity in a low temperature environment, the electrolytic capacitors are not easily damaged by internal thermal stress when used in a low temperature environment, and have high working stability and long life. Accordingly, electronic equipment including the electrolytic capacitors can also have a relatively long service life and relatively high working stability.

[0095] The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. An electrolytic capacitor, characterized in that: It includes a capacitor core and an electrode assembly, wherein the electrode assembly and the capacitor core are electrically connected, and the position where the capacitor core and the electrode assembly are electrically connected is an electrode connection position. There are multiple electrode connection positions, and at least some of the electrode connection positions are evenly spaced along the circumference of the capacitor core.

2. The electrolytic capacitor according to claim 1, characterized in that: The electrode connection positions are all located on the same annular track; or, the electrode connection positions are distributed on different annular tracks; The cross section of the outer wall of the capacitor core perpendicular to the axial direction is a reference track, the annular track and the reference track are similar figures, and the annular track and the reference track are concentrically arranged.

3. The electrolytic capacitor according to claim 2, characterized in that: When the electrode connection positions are all located on the same annular track, the electrode connection positions are evenly spaced along the annular track.

4. The electrolytic capacitor according to claim 2, characterized in that: When the electrode connection positions are distributed in different annular tracks, The electrode connection positions of each of the annular tracks are uniformly spaced apart along the circumference of the capacitor core as a whole; and / or the electrode connection positions on each of the annular tracks are uniformly spaced apart along the circumference of the capacitor core.

5. The electrolytic capacitor according to any one of claims 1 to 4, characterized in that: The electrode assembly includes an anode pin and a cathode pin, the capacitor core includes an anode portion and a cathode portion, the anode pin is electrically connected to the anode portion, the cathode pin is electrically connected to the cathode portion, the position where the anode portion and the anode pin are electrically connected is the anode connection position, the position where the cathode portion and the cathode pin are electrically connected is the cathode connection position, and the electrode connection positions include the anode connection position and the cathode connection position.

6. The electrolytic capacitor according to claim 5, characterized in that: The anode pin and the anode part are an integral structure formed in one piece, and the cathode pin and the cathode part are an integral structure formed in one piece.

7. The electrolytic capacitor according to claim 5, characterized in that: The electrode assembly further includes an anode connector and a cathode connector, the anode pin is electrically connected to the anode portion through the anode connector, and the cathode pin is electrically connected to the cathode portion through the cathode connector.

8. An electrolytic capacitor, characterized in that: It includes an anode part and a cathode part, the anode part and the cathode part are wound to form a capacitor core, the anode part has an anode unit protruding from the capacitor core, the cathode part has a cathode unit protruding from the capacitor core, the anode unit and the cathode unit constitute an electrode assembly of the electrolytic capacitor, and the anode unit and the cathode unit form full coverage along the circumference of the capacitor core.

9. A power supply device, characterized in that: Comprising the electrolytic capacitor as claimed in any one of claims 1 to 8.

10. An electronic device, characterized in that: The invention comprises a circuit board and an electrolytic capacitor as claimed in any one of claims 1 to 8 arranged on the circuit board.

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