Electrolytic capacitor core and electrolytic capacitor

Abstract

The utility model relates to an electrolytic capacitor core and an electrolytic capacitor, relates to the technical field of electrolytic capacitor preparation, and is used for solving the problem that the service life of the electrolytic capacitor is short. The roll comprises a roll core; the foil layer is wound on the winding core in the circumferential direction of the winding core; the electronic adhesive tape is wound on the foil layer in the circumferential direction of the winding core; the foil layer comprises a negative foil which extends out from one end, close to the bottom of the shell, of the foil layer and is in contact with the bottom; wherein heat generated by the foil layer can be dissipated to external air through the negative electrode foil and the shell in sequence. The lower end of the cathode foil is exposed out of the electrolytic capacitor core and is in contact with the bottom of the shell. Therefore, the cathode foil and the shell form a heat conduction path, namely a heat dissipation channel is additionally arranged. When the electrolytic capacitor works, part of heat generated by the positive electrode foil can be conducted to the shell through the negative electrode foil and then dissipated to the outside air through the shell. Therefore, the heat dissipation efficiency of the electrolytic capacitor is improved.

Description

Technical Field

[0001] This utility model relates to the field of electrolytic capacitor manufacturing technology, and in particular to an electrolytic capacitor core and an electrolytic capacitor. Background Technology

[0002] Lifespan is a core indicator for evaluating the performance of electrolytic capacitors. A longer lifespan increases the difficulty of design and manufacturing, and places higher demands on materials. Electrolytic capacitors generate a significant amount of heat during operation. If this heat cannot be dissipated in time, the internal temperature of the capacitor will rise sharply, affecting its operational stability and lifespan.

[0003] Electrolytic capacitors are widely used in various fields in the current technology, but their internal heat dissipation efficiency is not high, resulting in a lifespan that is generally only 5,000 hours. However, this lifespan is relatively short, which cannot meet the lifespan requirements of electrolytic capacitors in fields such as new energy photovoltaics, new energy vehicles, military, and medical power supplies.

[0004] In other words, existing technologies suffer from the problem of short lifespan of electrolytic capacitors. Utility Model Content

[0005] This invention provides an electrolytic capacitor core and an electrolytic capacitor to solve the problem of short lifespan of electrolytic capacitors.

[0006] This utility model provides an electrolytic capacitor core, which is disposed inside the outer casing of an electrolytic capacitor and includes:

[0007] Cabbage;

[0008] A foil layer, which is wound around the core in the circumferential direction;

[0009] Electronic tape, which is wound circumferentially around a foil layer along the core; and

[0010] The foil layer includes a negative electrode foil, which extends from one end of the foil layer near the bottom of the outer casing and contacts the bottom.

[0011] The heat generated by the foil layer can be dissipated to the outside air through the negative electrode foil and the outer shell in sequence.

[0012] In one embodiment, the vertical distance by which the negative electrode foil extends from one end of the foil layer near the bottom is D1, and the value of the vertical distance D1 is in the range of 1mm≤D1≤1.5mm.

[0013] In one embodiment, the foil layer includes:

[0014] A positive electrode foil assembly, which is wound circumferentially around the outer periphery of the core; and

[0015] A first insulating layer, which is wound circumferentially around the outer periphery of the positive electrode foil assembly along the core; and

[0016] A negative electrode foil assembly, which is wound circumferentially around the outer periphery of a first insulating layer along a core, the negative electrode foil assembly including a negative electrode foil; and

[0017] The second insulating layer is wound circumferentially around the outer periphery of the negative electrode foil assembly along the core.

[0018] The unfolded length of the positive electrode foil assembly is L1, the unfolded length of the first insulating layer is L2, the unfolded length of the negative electrode foil assembly is L3, and the unfolded length of the second insulating layer is L4, where L1 < L2 < L3 < L4.

[0019] In one embodiment, the two ends of the first insulating layer are flush with the two ends of the second insulating layer, and the two ends of the first insulating layer are flush with the two ends of the core. The bottom end of the negative electrode foil has a vertical distance D1 from the bottom end of the first insulating layer.

[0020] In one embodiment, the negative electrode foil assembly further includes:

[0021] A pad foil, which is disposed on the inner circumference of the negative electrode foil; and

[0022] The negative electrode conductive foil is placed on the pad foil and extends from the end of the electrolytic capacitor core away from the bottom.

[0023] In one embodiment, the positive electrode foil assembly includes:

[0024] The positive electrode foil is wound around the outer periphery of the core along the circumference of the core;

[0025] The positive electrode conductive foil is disposed on the inner circumference of the positive electrode foil and extends from the end of the electrolytic capacitor core away from the bottom.

[0026] In one embodiment, the end of the positive electrode foil near the bottom has a vertical distance D2 from the end of the negative electrode foil that is in contact with the bottom.

[0027] In one embodiment, the vertical distance D2 is in the range of 2mm ≤ D2 ≤ 2.5mm.

[0028] In one embodiment, the positive electrode foil has a three-dimensional porous structure, which is constructed by stacking and sintering aluminum powder particles.

[0029] In one implementation, the core includes:

[0030] A third isolation layer, one end of which is connected to the first isolation layer; and

[0031] The fourth isolation layer has one end connected to the second isolation layer;

[0032] The core structure is formed by the simultaneous winding of the third and fourth isolation layers.

[0033] In one embodiment, the third isolation layer and the first isolation layer are an integral structure, and / or the fourth isolation layer and the second isolation layer are an integral structure.

[0034] In one embodiment, the foil layer is distributed at a position away from the center of the electrolytic capacitor core and close to the outer peripheral surface of the electrolytic capacitor core.

[0035] In one embodiment, the diameter of the core is D3, and the value of diameter D3 is in the range of 12mm≤D3≤15mm.

[0036] This utility model provides an electrolytic capacitor, which includes:

[0037] The outer casing; and

[0038] The aforementioned electrolytic capacitor core; and

[0039] A cover plate, positioned at the opening of the housing, is used to seal the electrolytic capacitor core within the housing; and

[0040] Two leads are provided on the cover plate, and the two leads are respectively connected to the negative and positive conductive foil strips of the electrolytic capacitor core;

[0041] An insulating layer is fitted onto the outer periphery of the outer casing.

[0042] In one embodiment, the insulating layer includes:

[0043] Insulating gaskets, which are laid at the bottom of the housing; and

[0044] A sleeve, which is fitted onto the outer periphery of the outer shell.

[0045] Compared with existing technologies, the advantage of this invention lies in that the lower end of the negative electrode foil exposes the electrolytic capacitor core and contacts the bottom of the outer casing. This creates a heat conduction path between the negative electrode foil and the outer casing, effectively adding a heat dissipation channel. When the electrolytic capacitor is operating, some of the heat generated by its positive electrode foil can be conducted to the outer casing through the negative electrode foil, and then dissipated into the outside air through the outer casing. This improves the heat dissipation efficiency of the electrolytic capacitor, thereby reducing the overall temperature rise and ensuring that the electrolytic capacitor operates within permissible temperatures. This prevents the electrolytic capacitor from operating in high-temperature environments, extending its lifespan and improving its operational stability and reliability. Attached Figure Description

[0046] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0047] Figure 1 This is an unfolded view of the electrolytic capacitor core in Embodiment 1 of this utility model;

[0048] Figure 2 yes Figure 1 Surface morphology diagram of the positive electrode foil;

[0049] Figure 3 This is a surface morphology diagram of the positive electrode foil in the prior art;

[0050] Figure 4 yes Figure 1 The cross-sectional structure of the positive electrode foil is intended;

[0051] Figure 5 This is a surface morphology diagram of the positive electrode foil in the prior art;

[0052] Figure 6 This is an unfolded view of the electrolytic capacitor core in Embodiment 2 of this utility model;

[0053] Figure 7 This is an unfolded view of the electrolytic capacitor core in Embodiment 3 of this utility model;

[0054] Figure 8 This is a schematic diagram of the structure of the electrolytic capacitor in Embodiment 4 of this utility model;

[0055] Figure 9 yes Figure 8 Schematic diagram of heat dissipation channels for electrolytic capacitors;

[0056] Figure 10 This is a schematic diagram of the structural composition of an electrolytic capacitor in the prior art;

[0057] Figure 11 yes Figure 10 A schematic diagram of the heat dissipation channel for an electrolytic capacitor.

[0058] Figure label:

[0059] 10. Core; 20. Foil layer; 21. Negative electrode foil assembly; 211. Negative electrode foil; 212. Pad foil; 213. Negative electrode conductive foil strip; 22. Positive electrode foil assembly; 221. Positive electrode foil; 222. Positive electrode conductive foil strip; 23. First insulating layer; 24. Second insulating layer; 30. Electronic tape; 100. Electrolytic capacitor core; 200. Shell; 300. Cover plate; 400. Lead-out terminal; 500. Insulating layer; 501. Insulating gasket; 502. Sleeve; 10'. Core; 20'. Foil layer; 30'. Electronic tape; 100'. Electrolytic capacitor core; 200'. Shell; 300'. Cover plate; 400'. Lead-out terminal; 500'. Insulating layer; 501'. Insulating gasket; 502'. Sleeve. Detailed Implementation

[0060] The present invention will be further described below with reference to the accompanying drawings.

[0061] Example 1

[0062] like Figure 1 As shown, this utility model provides an electrolytic capacitor core 100, which is disposed inside the outer casing 200 of an electrolytic capacitor. The electrolytic capacitor core 100 includes a core 10, a foil layer 20, and electronic tape 30. The foil layer 20 includes a negative electrode foil 211, which extends from one end of the foil layer 20 near the bottom of the outer casing 200 and contacts the bottom. The heat generated by the foil layer 20 can be dissipated to the outside air through the negative electrode foil 211 and the outer casing 200 in sequence.

[0063] In the above configuration, the lower end of the negative electrode foil 211 exposes the electrolytic capacitor core 100 and contacts the bottom of the outer casing 200. This creates a heat conduction path between the negative electrode foil 211 and the outer casing 200, effectively adding a heat dissipation channel. When the electrolytic capacitor is operating, some of the heat generated by its positive electrode foil 221 can be conducted to the outer casing 200 through the negative electrode foil 211, and then dissipated into the outside air through the outer casing 200. This improves the heat dissipation efficiency of the electrolytic capacitor, thereby reducing the overall temperature rise and ensuring that the electrolytic capacitor operates within permissible temperatures. This prevents the electrolytic capacitor from operating in high-temperature environments, extending its lifespan and improving its operational stability and reliability.

[0064] Specifically, such as Figure 1 As shown, in one embodiment, the vertical distance by which the negative electrode foil 211 extends from the end of the foil layer 20 near the bottom is D1, and the value range of the vertical distance D1 is: 1mm≤D1≤1.5mm.

[0065] In the above configuration, controlling the vertical distance D1 of the negative electrode foil 211 extending from the end of the foil layer 20 near the bottom within the above-mentioned range can achieve the following two effects, as follows:

[0066] Firstly, it ensures that the lower end of the negative electrode foil 211 is in contact with the bottom of the outer casing 200. This ensures that the negative electrode foil 211 and the outer casing 200 form a heat conduction path. Furthermore, it ensures that when the electrolytic capacitor is operating, the heat generated by its positive electrode foil 221 can be conducted through the negative electrode foil 211 to the outer casing 200, and then dissipated into the outside air through the outer casing 200. This improves the heat dissipation efficiency of the electrolytic capacitor, thereby reducing the overall temperature rise of the electrolytic capacitor.

[0067] Secondly, it facilitates the winding of the foil layer 20 along the circumference of the core 10, and also facilitates the production of the foil layer 20. It can also avoid... Figure 7 The misalignment of the positive foil 221 and the negative foil 211 leads to a deterioration in the capacitance parameters.

[0068] Furthermore, such as Figure 1 As shown, in one embodiment, the vertical distance D1 is preferably 1.25 mm.

[0069] Specifically, such as Figure 1 As shown, in one embodiment, the foil layer 20 includes a positive electrode foil assembly 22, a first insulating layer 23, a negative electrode foil assembly 21, and a second insulating layer 24. The positive electrode foil assembly 22 is wound circumferentially around the outer periphery of the core 10; the first insulating layer 23 is wound circumferentially around the outer periphery of the positive electrode foil assembly 22; the negative electrode foil assembly 21 is wound circumferentially around the outer periphery of the first insulating layer 23; and the second insulating layer 24 is wound circumferentially around the outer periphery of the negative electrode foil assembly 21. The unfolded length of the positive electrode foil assembly 22 is L1, the unfolded length of the first insulating layer 23 is L2, the unfolded length of the negative electrode foil assembly 21 is L3, and the unfolded length of the second insulating layer 24 is L4, where L1 < L2 < L3 < L4. The negative electrode foil assembly 21 includes a negative electrode foil 211.

[0070] In the above configuration, the first isolation layer 23 and the second isolation layer 24 provide isolation, thus preventing the negative electrode foil assembly 21 from directly contacting and conducting with the positive electrode foil assembly 22. This ensures that the electrolytic capacitor can operate normally.

[0071] It should be noted that the unfolded lengths of the positive electrode foil assembly 22 (L1), the first insulating layer 23 (L2), the negative electrode foil assembly 21 (L3), and the second insulating layer 24 (L4) are set in the order L1 < L2 < L3 < L4. This ensures that the first insulating layer 23 completely covers the positive electrode foil assembly 22 in the circumferential direction, thereby ensuring that the positive electrode foil assembly 22 does not come into contact with the negative electrode foil assembly 21. Similarly, this ensures that the second insulating layer 24 completely covers the negative electrode foil assembly 21 in the circumferential direction, thereby ensuring that the negative electrode foil assembly 21 is not exposed. This, in turn, ensures that the electrolytic capacitor can operate normally.

[0072] Specifically, such as Figure 1 As shown, in one embodiment, the two ends of the first insulating layer 23 are flush with the two ends of the second insulating layer 24, and the two ends of the first insulating layer 23 are flush with the two ends of the core 10. The bottom end of the negative electrode foil 211 has a vertical distance D1 from the bottom end of the first insulating layer 23. That is, the lower end of the negative electrode foil 211 has a vertical distance D1 from the lower end of the first insulating layer 23.

[0073] Specifically, such as Figure 1 As shown, in one embodiment, the upper end of the negative electrode foil 211 is vertically separated from the upper end of the second insulating layer 24, and the upper end of the negative electrode foil 211 is located within the second insulating layer 24. This prevents the upper end of the negative electrode foil 211 from protruding from the electrolytic capacitor core 100, thus avoiding interference with the normal operation of the electrolytic capacitor.

[0074] Specifically, such as Figure 1 As shown, in one embodiment, the negative electrode foil assembly 21 further includes a pad foil 212 and a negative electrode conductive foil strip 213. The pad foil 212 is disposed on the inner periphery of the negative electrode foil 211; the negative electrode conductive foil strip 213 is disposed on the pad foil 212 and extends from the end of the electrolytic capacitor core 100 away from the bottom.

[0075] Specifically, such as Figure 1 As shown, in one embodiment, the positive electrode foil assembly 22 includes a positive electrode foil 221 and a positive electrode conductive strip 222. The positive electrode foil 221 is wound around the outer periphery of the core 10 in the circumferential direction; the positive electrode conductive strip 222 is disposed on the inner periphery of the positive electrode foil 221 and extends from the end of the electrolytic capacitor core 100 away from the bottom.

[0076] Specifically, such as Figure 1 As shown, in one embodiment, the end of the positive electrode foil 221 near the bottom has a vertical distance D2 from the end of the negative electrode foil 211 that is in contact with the bottom.

[0077] Specifically, such as Figure 1As shown, in one embodiment, the vertical distance D2 ranges from 2mm to 2.5mm.

[0078] Furthermore, in one embodiment, the vertical distance D2 ranges from 2.4 mm.

[0079] It should be noted that setting D2 within the above range can avoid the risk of product short circuit. The larger the D2 value, the greater the distance between the lower edges of the positive electrode foil 221 and the negative electrode foil 211, which is similar to increasing the creepage distance.

[0080] Specifically, in one embodiment, the positive electrode foil 221 has a three-dimensional porous structure, which is constructed by stacking and sintering aluminum powder particles.

[0081] In the above configuration, the specific capacitance of the three-dimensional perforated structure is increased by more than 25% compared with the prior art. This can effectively reduce the space occupied by the electrode foil winding and be used for structural optimization, thereby making the perforated structure on the positive electrode foil 221 more uniform and its surface heat distribution more uniform. This avoids the problem of deterioration of the positive electrode foil 221 caused by local high temperature, which leads to a reduction in the durability and life of the capacitor.

[0082] It should be noted that the electrolytic capacitor in this embodiment is an aluminum electrolytic capacitor. The positive electrode foil 221 in this embodiment is the main material of the aluminum electrolytic capacitor, which is made of pure aluminum foil through processes such as etching and formation, and meets the requirements of the capacitor. The specific capacitance of aluminum foil in the prior art is limited due to the influence of the etching process. In this embodiment, the positive electrode foil 221 adopts a composite three-dimensional electrode foil, that is, a three-dimensional porous structure constructed by stacking and sintering aluminum powder particles, which replaces the porous structure caused by the etching process in the prior art. Its specific capacitance is increased by more than 25%, which can effectively reduce the space occupied by the electrode foil winding and can be used for structural optimization.

[0083] Specifically, such as Figure 2 and Figure 4 As shown, in one embodiment, a composite three-dimensional electrode foil is used: this type of electrode foil has a more uniform heat distribution on the aluminum foil surface, avoiding the degradation of the positive electrode foil caused by local high temperature.

[0084] Specifically, such as Figure 3 and Figure 5 As shown, in one embodiment, the pore structure of the electrode foil in the prior art is sparse and uneven, which can easily cause local high temperatures and make the positive electrode foil more prone to deterioration.

[0085] Specifically, in one embodiment, the core 10 includes a third isolation layer and a fourth isolation layer. The third isolation layer is connected at one end to the first isolation layer 23; the fourth isolation layer is connected at one end to the second isolation layer 24; the core 10 is constructed by simultaneously winding the third isolation layer and the fourth isolation layer.

[0086] Specifically, in one embodiment, the third isolation layer and the first isolation layer 23 are an integral structure, and the fourth isolation layer and the second isolation layer 24 are an integral structure.

[0087] In the above configuration, the third isolation layer and the first isolation layer 23 are integrally formed, and the fourth isolation layer and the second isolation layer 24 are integrally formed. Thus, after the core 10 is formed by simultaneously winding the fourth and third isolation layers, it can be further simultaneously wound to form the foil layer 20. This eliminates the need to consider the initial connection between the foil layer 20 and the core 10, thereby simplifying the manufacturing process of the electrolytic capacitor core 100 and improving its manufacturing efficiency.

[0088] Specifically, in one embodiment, the first to fourth isolation layers are all made of isolation paper, the third isolation layer and the first isolation layer 23 are made of a single sheet of isolation paper, and the fourth isolation layer and the second isolation layer 24 are made of a single sheet of isolation paper.

[0089] Specifically, such as Figure 1 As shown, in one embodiment, the foil layer 20 is distributed at a position away from the center of the electrolytic capacitor core 100 and close to the outer peripheral surface of the electrolytic capacitor core 100.

[0090] In the above configuration, the core material positive electrode foil 221 is distributed near the outside of the product. Therefore, the high temperature in the center cannot affect the positive electrode foil 221. The positive electrode foil 221 is in a lower temperature range, which can effectively improve the product's durability.

[0091] Specifically, such as Figure 1 As shown, in one embodiment, the diameter of the core 10 is D3, and the value of the diameter D3 is in the range of 12mm≤D3≤15mm.

[0092] Furthermore, in one embodiment, the diameter D3 is 14 mm.

[0093] In the above settings, setting D3 to the above value can avoid the risk of internal breakdown at the core position, and also reduce the heat generation at the core position.

[0094] It should be noted that if the diameter D3 is too small, the winding radius will also be too small, making the aluminum foil prone to breakage or damage at the starting point, and increasing the risk of puncture during use. Increasing the diameter D3 of the electrolytic paper winding can reduce the heating area of ​​the core.

[0095] It should be noted that the release paper is first wound to form a paper core (core 10) with a diameter of 12mm to 15mm. Then, the negative electrode foil 211 and the positive electrode foil 221 are wound simultaneously to complete the fabrication of the foil layer 20. Finally, electronic tape 30 is used to wind and fix the foil layer 20.

[0096] It should be noted that in conventional products, the positive electrode foil inside continuously generates heat during operation and transfers this heat to the outside of the capacitor through contact heat transfer and thermal radiation. The center of the electrolytic capacitor core has a long path for heat transfer to the outside, making it more prone to heat accumulation. Typically, the temperature at the center is more than 1.5 times higher than the outside temperature. The higher the temperature, the faster the positive electrode foil deteriorates, directly affecting the capacitor's lifespan. In this embodiment, the core structure center (the center of the electrolytic capacitor core 100) adopts a paper core design, with the core material, the positive electrode foil 221, distributed near the outside of the product. Therefore, in this embodiment, the localized high temperature at the center of the electrolytic capacitor core 100 does not affect the positive electrode foil 221, which remains in a lower temperature range, effectively improving the product's durability.

[0097] Specifically, such as Figure 1 As shown, in one embodiment, the negative electrode foil 211 is widened near the outer casing, and its lower end is wider than that of the positive electrode foil 221. The lower end of the negative electrode foil extends beyond the positive electrode foil 221 and the insulating paper by 1.0 to 1.5 mm beyond the edge of the insulating paper, so that the lower end of the negative electrode foil 211 exposed from the core (electrolytic capacitor core 100) can effectively contact and tightly adhere to the outer casing 200.

[0098] The advantage of this structural design is that the negative electrode foil 211 is made of high-purity aluminum foil, which serves as a current collector and draws out its capacity. In this embodiment, taking advantage of the fast thermal conductivity of the metal in the negative electrode foil 211, the structure is designed so that the lower end of the negative electrode foil exposes the core and contacts the bottom of the aluminum shell (outer shell 200), adding a heat conduction path (see reference). Figure 9 This improves heat dissipation efficiency, allowing the heat generated by the positive electrode foil 221 to be quickly transferred to the outside air through the negative electrode foil 211 and the outer casing 200, thereby reducing the overall temperature rise of the product and improving the durability of the aluminum electrolytic capacitor.

[0099] Example 2

[0100] like Figure 6 As shown, this utility model provides an electrolytic capacitor core 100, which is disposed inside the outer casing 200 of an electrolytic capacitor. The electrolytic capacitor core 100 includes a core 10, a foil layer 20, and electronic tape 30. The foil layer 20 includes a negative electrode foil 211, which extends from one end of the foil layer 20 near the bottom of the outer casing 200 and contacts the bottom. The heat generated by the foil layer 20 can be dissipated to the outside air through the negative electrode foil 211 and the outer casing 200 in sequence.

[0101] It should be noted that the lower end of the negative electrode foil 211 protrudes from the electrolytic capacitor core 100 and contacts the bottom of the outer casing 200. This creates a heat conduction path between the negative electrode foil 211 and the outer casing 200, effectively adding a heat dissipation channel. When the electrolytic capacitor is operating, some of the heat generated by its positive electrode foil 221 can be conducted to the outer casing 200 through the negative electrode foil 211, and then dissipated into the outside air through the outer casing 200. This improves the heat dissipation efficiency of the electrolytic capacitor, thereby reducing the overall temperature rise and ensuring that the electrolytic capacitor operates within the allowable temperature range. This prevents the electrolytic capacitor from operating in high-temperature environments, extending its lifespan and improving its operational stability and reliability.

[0102] Specifically, such as Figure 6 As shown, in one embodiment, the vertical distance by which the negative electrode foil 211 extends from the end of the foil layer 20 near the bottom is D1, and the value range of the vertical distance D1 is: 1mm≤D1≤1.5mm.

[0103] In the above configuration, controlling the vertical distance D1 of the negative electrode foil 211 extending from the end of the foil layer 20 near the bottom within the above-mentioned range can achieve the following two effects, as follows:

[0104] Firstly, it ensures that the lower end of the negative electrode foil 211 is in contact with the bottom of the outer casing 200. This ensures that the negative electrode foil 211 and the outer casing 200 form a heat conduction path. Furthermore, it ensures that when the electrolytic capacitor is operating, the heat generated by its positive electrode foil 221 can be conducted through the negative electrode foil 211 to the outer casing 200, and then dissipated into the outside air through the outer casing 200. This improves the heat dissipation efficiency of the electrolytic capacitor, thereby reducing the overall temperature rise of the electrolytic capacitor.

[0105] Secondly, it facilitates the winding of the foil layer 20 around the core 10, and also facilitates the production of the foil layer 20.

[0106] Furthermore, such as Figure 1 As shown, in one embodiment, the vertical distance D1 is preferably 1.25 mm.

[0107] Specifically, such as Figure 6As shown, in one embodiment, the foil layer 20 includes a positive electrode foil assembly 22, a first insulating layer 23, a negative electrode foil assembly 21, and a second insulating layer 24. The positive electrode foil assembly 22 is wound circumferentially around the outer periphery of the core 10; the first insulating layer 23 is wound circumferentially around the outer periphery of the positive electrode foil assembly 22; the negative electrode foil assembly 21 is wound circumferentially around the outer periphery of the first insulating layer 23; and the second insulating layer 24 is wound circumferentially around the outer periphery of the negative electrode foil assembly 21. The unfolded length of the positive electrode foil assembly 22 is L1, the unfolded length of the first insulating layer 23 is L2, the unfolded length of the negative electrode foil assembly 21 is L3, and the unfolded length of the second insulating layer 24 is L4, where L1 < L2 < L3 < L4. The negative electrode foil assembly 21 includes a negative electrode foil 211. The first insulating layer 23 and the second insulating layer 24 provide isolation, thus preventing the negative electrode foil assembly 21 from directly contacting and conducting with the positive electrode foil assembly 22. This ensures that the electrolytic capacitor can operate normally.

[0108] It should be noted that the unfolded lengths of the positive electrode foil assembly 22 (L1), the first insulating layer 23 (L2), the negative electrode foil assembly 21 (L3), and the second insulating layer 24 (L4) are set in the order L1 < L2 < L3 < L4. This ensures that the first insulating layer 23 completely covers the positive electrode foil assembly 22 in the circumferential direction, thereby ensuring that the positive electrode foil assembly 22 does not come into contact with the negative electrode foil assembly 21. Similarly, this ensures that the second insulating layer 24 completely covers the negative electrode foil assembly 21 in the circumferential direction, thereby ensuring that the negative electrode foil assembly 21 is not exposed. This, in turn, ensures that the electrolytic capacitor can operate normally.

[0109] Specifically, such as Figure 6 As shown, in one embodiment, the two ends of the first insulating layer 23 are flush with the two ends of the second insulating layer 24, and the two ends of the first insulating layer 23 are flush with the two ends of the core 10. The bottom end of the negative electrode foil 211 has a vertical distance D1 from the bottom end of the first insulating layer 23. That is, the lower end of the negative electrode foil 211 has a vertical distance D1 from the lower end of the first insulating layer 23.

[0110] Specifically, such as Figure 6 As shown, in one embodiment, the upper end of the negative electrode foil 211 is vertically separated from the upper end of the second insulating layer 24, and the upper end of the negative electrode foil 211 is located within the second insulating layer 24. This prevents the upper end of the negative electrode foil 211 from protruding from the electrolytic capacitor core 100, thus avoiding interference with the normal operation of the electrolytic capacitor.

[0111] Specifically, such as Figure 6As shown, in one embodiment, the negative electrode foil assembly 21 further includes a pad foil 212 and a negative electrode conductive foil strip 213. The pad foil 212 is disposed on the inner periphery of the negative electrode foil 211; the negative electrode conductive foil strip 213 is disposed on the pad foil 212 and extends from the end of the electrolytic capacitor core 100 away from the bottom.

[0112] Specifically, such as Figure 6 As shown, in one embodiment, the positive electrode foil assembly 22 includes a positive electrode foil 221 and a positive electrode conductive strip 222. The positive electrode foil 221 is wound around the outer periphery of the core 10 in the circumferential direction; the positive electrode conductive strip 222 is disposed on the inner periphery of the positive electrode foil 221 and extends from the end of the electrolytic capacitor core 100 away from the bottom.

[0113] Specifically, in one embodiment, the positive electrode foil 221 has a three-dimensional porous structure, which is constructed by stacking and sintering aluminum powder particles.

[0114] In the above configuration, the specific capacitance of the three-dimensional perforated structure is increased by more than 25% compared with the prior art. This can effectively reduce the space occupied by the electrode foil winding and be used for structural optimization, thereby making the perforated structure on the positive electrode foil 221 more uniform and its surface heat distribution more uniform. This avoids the problem of deterioration of the positive electrode foil 221 caused by local high temperature, which leads to a reduction in the durability and life of the capacitor.

[0115] It should be noted that the electrolytic capacitor in this embodiment is an aluminum electrolytic capacitor. The positive electrode foil 221 in this embodiment is the main material of the aluminum electrolytic capacitor, which is made of pure aluminum foil through processes such as etching and formation, and meets the requirements of the capacitor. The specific capacitance of aluminum foil in the prior art is limited due to the influence of the etching process. In this embodiment, the positive electrode foil 221 adopts a composite three-dimensional electrode foil, that is, a three-dimensional porous structure constructed by stacking and sintering aluminum powder particles, which replaces the porous structure caused by the etching process in the prior art. Its specific capacitance is increased by more than 25%, which can effectively reduce the space occupied by the electrode foil winding and can be used for structural optimization.

[0116] Specifically, refer to Figure 2 and Figure 4 As shown, in one embodiment, a composite three-dimensional electrode foil is used: this type of electrode foil has a more uniform heat distribution on the aluminum foil surface, avoiding the degradation of the positive electrode foil caused by local high temperature.

[0117] Specifically, refer to Figure 3 and Figure 5 As shown, in one embodiment, the pore structure of the electrode foil in the prior art is sparse and uneven, which can easily cause local high temperatures and make the positive electrode foil more prone to deterioration.

[0118] Specifically, in one embodiment, the core 10 includes a third isolation layer and a fourth isolation layer. The third isolation layer is connected at one end to the first isolation layer 23; the fourth isolation layer is connected at one end to the second isolation layer 24; the core 10 is constructed by simultaneously winding the third isolation layer and the fourth isolation layer.

[0119] Specifically, in one embodiment, the first to fourth isolation layers are all made of release paper.

[0120] Specifically, such as Figure 1 As shown, in one embodiment, the foil layer 20 is distributed near the center of the electrolytic capacitor core.

[0121] It should be noted that the release paper (the third and fourth release layers) is first wound to form a paper core (core 10), and then the negative electrode foil assembly 21, the positive electrode foil assembly 22, and the first and second release layers are wound to complete the fabrication of the foil layer 20. Finally, electronic tape 30 is used to wind and fix the foil layer 20.

[0122] Specifically, such as Figure 1 As shown, in one embodiment, the negative electrode foil 211 is widened near the outer casing, and its lower end is wider than that of the positive electrode foil 221. The lower end of the negative electrode foil extends beyond the positive electrode foil 221 and the insulating paper by 1.0 to 1.5 mm beyond the edge of the insulating paper, so that the lower end of the negative electrode foil 211 exposed from the core (electrolytic capacitor core 100) can effectively contact and tightly adhere to the outer casing 200.

[0123] The advantage of this structural design is that the negative electrode foil 211 is made of high-purity aluminum foil, which serves as a current collector and draws out its capacity. In this embodiment, taking advantage of the fast thermal conductivity of the metal in the negative electrode foil 211, the structure is designed so that the lower end of the negative electrode foil exposes the core and contacts the bottom of the aluminum shell (outer shell 200), adding a heat conduction path (see reference). Figure 9 This improves heat dissipation efficiency, allowing the heat generated by the positive electrode foil 221 to be quickly transferred to the outside air through the negative electrode foil 211 and the outer casing 200, thereby reducing the overall temperature rise of the product and improving the durability of the aluminum electrolytic capacitor.

[0124] Example 3

[0125] like Figure 7 As shown, this utility model provides an electrolytic capacitor core 100, which is disposed inside the outer casing 200 of an electrolytic capacitor. The electrolytic capacitor core 100 includes a core 10, a foil layer 20, and electronic tape 30. The foil layer 20 includes a negative electrode foil 211, which extends from one end of the foil layer 20 near the bottom of the outer casing 200 and contacts the bottom. The heat generated by the foil layer 20 can be dissipated to the outside air through the negative electrode foil 211 and the outer casing 200 in sequence.

[0126] It should be noted that the lower end of the negative electrode foil 211 protrudes from the electrolytic capacitor core 100 and contacts the bottom of the outer casing 200. This creates a heat conduction path between the negative electrode foil 211 and the outer casing 200, effectively adding a heat dissipation channel. When the electrolytic capacitor is operating, some of the heat generated by its positive electrode foil 221 can be conducted to the outer casing 200 through the negative electrode foil 211, and then dissipated into the outside air through the outer casing 200. This improves the heat dissipation efficiency of the electrolytic capacitor, thereby reducing the overall temperature rise and ensuring that the electrolytic capacitor operates within the allowable temperature range. This prevents the electrolytic capacitor from operating in high-temperature environments, extending its lifespan and improving its operational stability and reliability.

[0127] Specifically, such as Figure 7 As shown, in one embodiment, the foil layer 20 includes a positive electrode foil assembly 22, a first insulating layer 23, a negative electrode foil assembly 21, and a second insulating layer 24. The positive electrode foil assembly 22 is wound circumferentially around the outer periphery of the core 10; the first insulating layer 23 is wound circumferentially around the outer periphery of the positive electrode foil assembly 22; the negative electrode foil assembly 21 is wound circumferentially around the outer periphery of the first insulating layer 23; and the second insulating layer 24 is wound circumferentially around the outer periphery of the negative electrode foil assembly 21. The unfolded length of the positive electrode foil assembly 22 is L1, the unfolded length of the first insulating layer 23 is L2, the unfolded length of the negative electrode foil assembly 21 is L3, and the unfolded length of the second insulating layer 24 is L4, where L1 < L2 < L3 < L4. The negative electrode foil assembly 21 includes a negative electrode foil 211.

[0128] In the above configuration, the first isolation layer 23 and the second isolation layer 24 provide isolation, thus preventing the negative electrode foil assembly 21 from directly contacting and conducting with the positive electrode foil assembly 22. This ensures that the electrolytic capacitor can operate normally.

[0129] It should be noted that the unfolded lengths of the positive electrode foil assembly 22 (L1), the first insulating layer 23 (L2), the negative electrode foil assembly 21 (L3), and the second insulating layer 24 (L4) are set in the order L1 < L2 < L3 < L4. This ensures that the first insulating layer 23 completely covers the positive electrode foil assembly 22 in the circumferential direction, thereby ensuring that the positive electrode foil assembly 22 does not come into contact with the negative electrode foil assembly 21. Similarly, this ensures that the second insulating layer 24 completely covers the negative electrode foil assembly 21 in the circumferential direction, thereby ensuring that the negative electrode foil assembly 21 is not exposed. This, in turn, ensures that the electrolytic capacitor can operate normally.

[0130] Specifically, such as Figure 7As shown, in one embodiment, the upper end of the negative electrode foil 211 is vertically separated from the upper end of the second insulating layer 24, and both the upper and lower ends of the negative electrode foil 211 are located within the second insulating layer 24. This prevents the upper end of the negative electrode foil 211 from protruding from the electrolytic capacitor core 100, thus avoiding interference with the normal operation of the electrolytic capacitor.

[0131] Specifically, such as Figure 7 As shown, in one embodiment, the negative electrode foil assembly 21 further includes a pad foil 212 and a negative electrode conductive foil strip 213. The pad foil 212 is disposed on the inner periphery of the negative electrode foil 211; the negative electrode conductive foil strip 213 is disposed on the pad foil 212 and extends from the end of the electrolytic capacitor core 100 away from the bottom.

[0132] Specifically, such as Figure 7 As shown, in one embodiment, the positive electrode foil assembly 22 includes a positive electrode foil 221 and a positive electrode conductive strip 222. The positive electrode foil 221 is wound around the outer periphery of the core 10 in the circumferential direction; the positive electrode conductive strip 222 is disposed on the inner periphery of the positive electrode foil 221 and extends from the end of the electrolytic capacitor core 100 away from the bottom.

[0133] Specifically, such as Figure 7 As shown, in one embodiment, the upper and lower ends of the positive electrode foil 221 are located within the first insulating layer 23, and the two ends of the positive electrode foil 221 are flush with the two ends of the negative electrode foil 211.

[0134] Specifically, in one embodiment, the positive electrode foil 221 has a three-dimensional porous structure, which is constructed by stacking and sintering aluminum powder particles.

[0135] In the above configuration, the specific capacitance of the three-dimensional perforated structure is increased by more than 25% compared with the prior art. This can effectively reduce the space occupied by the electrode foil winding and be used for structural optimization, thereby making the perforated structure on the positive electrode foil 221 more uniform and its surface heat distribution more uniform. This avoids the problem of deterioration of the positive electrode foil 221 caused by local high temperature, which leads to a reduction in the durability and life of the capacitor.

[0136] It should be noted that the electrolytic capacitor in this embodiment is an aluminum electrolytic capacitor. The positive electrode foil 221 in this embodiment is the main material of the aluminum electrolytic capacitor, which is made of pure aluminum foil through processes such as etching and formation, and meets the requirements of the capacitor. The specific capacitance of aluminum foil in the prior art is limited due to the influence of the etching process. In this embodiment, the positive electrode foil 221 adopts a composite three-dimensional electrode foil, that is, a three-dimensional porous structure constructed by stacking and sintering aluminum powder particles, which replaces the porous structure caused by the etching process in the prior art. Its specific capacitance is increased by more than 25%, which can effectively reduce the space occupied by the electrode foil winding and can be used for structural optimization.

[0137] Specifically, refer to Figure 2 and Figure 4 As shown, in one embodiment, a composite three-dimensional electrode foil is used: this type of electrode foil has a more uniform heat distribution on the aluminum foil surface, avoiding the degradation of the positive electrode foil caused by local high temperature.

[0138] Specifically, refer to Figure 3 and Figure 5 As shown, in one embodiment, the pore structure of the electrode foil in the prior art is sparse and uneven, which can easily cause local high temperatures and make the positive electrode foil more prone to deterioration.

[0139] Specifically, in one embodiment, the core 10 includes a third isolation layer and a fourth isolation layer. The third isolation layer is connected at one end to the first isolation layer 23; the fourth isolation layer is connected at one end to the second isolation layer 24; the core 10 is constructed by simultaneously winding the third isolation layer and the fourth isolation layer.

[0140] Specifically, in one embodiment, the third isolation layer and the first isolation layer 23 are an integral structure, and the fourth isolation layer and the second isolation layer 24 are an integral structure.

[0141] Since the third insulating layer and the first insulating layer 23 are integrally formed, and the fourth insulating layer and the second insulating layer 24 are integrally formed, after the core 10 is formed by simultaneously winding the fourth and third insulating layers, the foil layer 20 can be continuously wound synchronously. This eliminates the need to consider the initial connection between the foil layer 20 and the core 10, thus simplifying the manufacturing process of the electrolytic capacitor core 100 and improving its manufacturing efficiency.

[0142] Specifically, in one embodiment, the first to fourth isolation layers are all made of isolation paper, the third isolation layer and the first isolation layer 23 are made of a single sheet of isolation paper, and the fourth isolation layer and the second isolation layer 24 are made of a single sheet of isolation paper.

[0143] Specifically, such as Figure 7 As shown, in one embodiment, the foil layer 20 is distributed at a position away from the center of the electrolytic capacitor core 100 and close to the outer peripheral surface of the electrolytic capacitor core 100.

[0144] In the above configuration, the core material positive electrode foil 221 is distributed near the outside of the product. Therefore, the high temperature in the center cannot affect the positive electrode foil 221. The positive electrode foil 221 is in a lower temperature range, which can effectively improve the product's durability.

[0145] Specifically, such as Figure 7 As shown, in one embodiment, the diameter of the core 10 is D3, and the value of the diameter D3 is in the range of 12mm≤D3≤15mm.

[0146] Furthermore, in one embodiment, the diameter D3 is 14 mm.

[0147] It should be noted that the release paper is first wound to form a paper core (core 10) with a diameter of 12mm to 15mm. Then, the negative electrode foil 211 and the positive electrode foil 221 are wound simultaneously to complete the fabrication of the foil layer 20. Finally, electronic tape 30 is used to wind and fix the foil layer 20.

[0148] It should be noted that in conventional products, the positive electrode foil inside continuously generates heat during operation and transfers this heat to the outside of the capacitor through contact heat transfer and thermal radiation. The center of the electrolytic capacitor core has a long path for heat transfer to the outside, making it more prone to heat accumulation. Typically, the temperature at the center is more than 1.5 times higher than the outside temperature. The higher the temperature, the faster the positive electrode foil deteriorates, directly affecting the capacitor's lifespan. In this embodiment, the core structure center (the center of the electrolytic capacitor core 100) adopts a paper core design, with the core material, the positive electrode foil 221, distributed near the outside of the product. Therefore, in this embodiment, the localized high temperature at the center of the electrolytic capacitor core 100 does not affect the positive electrode foil 221, which remains in a lower temperature range, effectively improving the product's durability.

[0149] Example 4

[0150] like Figure 8 As shown, this utility model provides an electrolytic capacitor, which includes a housing 200, an electrolytic capacitor core 100 as described in Embodiment 1, a cover plate 300, two lead terminals 400, and an insulating layer 500. The cover plate 300 is disposed at the opening of the housing 200 and is used to seal the electrolytic capacitor core 100 within the housing 200. The two lead terminals 400 pass through the cover plate 300 and are respectively connected to the negative and positive conductive foil strips of the electrolytic capacitor core 100. The insulating layer 500 is sleeved on the outer periphery of the housing 200.

[0151] Specifically, such as Figure 8 As shown, in one embodiment, the insulating layer 500 includes an insulating gasket 501 and a sleeve 502, wherein the insulating gasket 501 is laid on the bottom of the housing 200; and the sleeve 502 is fitted on the outer periphery of the housing 200.

[0152] It should be noted that the lead-out terminal 400 serves to connect and solder to the PCBA board, and it is integrally machined with the cover plate 300. The cover plate 300, in conjunction with the aluminum shell, provides a seal, ensuring the capacitor's lifespan. The conductive foil strip connects the foil layer and the cover plate 300, serving as the capacitance lead-out function. Electronic tape 30 secures the cylindrical electrolytic capacitor core. The aluminum shell contains the impregnated core and, in conjunction with the cover plate 300, provides a seal. The heat-shrink sleeve 502 wraps around the aluminum shell, providing insulation. An insulating gasket 501 is placed at the bottom of the aluminum shell, providing insulation between the bottom of the aluminum shell and other components.

[0153] Specifically, such as Figure 1 As shown, in one embodiment, the electrolytic capacitor core 100 is disposed within the casing 200 of the electrolytic capacitor. The electrolytic capacitor core 100 includes a core 10, a foil layer 20, and electronic tape 30. The foil layer 20 includes a negative electrode foil 211, which extends from one end of the foil layer 20 near the bottom of the casing 200 and contacts the bottom. The heat generated by the foil layer 20 can be dissipated to the outside air in sequence through the negative electrode foil 211 and the casing 200.

[0154] Specifically, such as Figure 1 As shown, in one embodiment, the vertical distance by which the negative electrode foil 211 extends from the end of the foil layer 20 near the bottom is D1, and the value range of the vertical distance D1 is: 1mm≤D1≤1.5mm.

[0155] Furthermore, such as Figure 1 As shown, in one embodiment, the vertical distance D1 is preferably 1.25 mm.

[0156] Specifically, such as Figure 1 As shown, in one embodiment, the foil layer 20 includes a positive electrode foil assembly 22, a first insulating layer 23, a negative electrode foil assembly 21, and a second insulating layer 24. The positive electrode foil assembly 22 is wound circumferentially around the outer periphery of the core 10; the first insulating layer 23 is wound circumferentially around the outer periphery of the positive electrode foil assembly 22; the negative electrode foil assembly 21 is wound circumferentially around the outer periphery of the first insulating layer 23; and the second insulating layer 24 is wound circumferentially around the outer periphery of the negative electrode foil assembly 21. The unfolded length of the positive electrode foil assembly 22 is L1, the unfolded length of the first insulating layer 23 is L2, the unfolded length of the negative electrode foil assembly 21 is L3, and the unfolded length of the second insulating layer 24 is L4, where L1 < L2 < L3 < L4. The negative electrode foil assembly 21 includes a negative electrode foil 211.

[0157] Specifically, such as Figure 1As shown, in one embodiment, the two ends of the first insulating layer 23 are flush with the two ends of the second insulating layer 24, and the two ends of the first insulating layer 23 are flush with the two ends of the core 10. The bottom end of the negative electrode foil 211 has a vertical distance D1 from the bottom end of the first insulating layer 23. That is, the lower end of the negative electrode foil 211 has a vertical distance D1 from the lower end of the first insulating layer 23.

[0158] Specifically, such as Figure 1 As shown, in one embodiment, the upper end of the negative electrode foil 211 is vertically separated from the upper end of the second insulating layer 24, and the upper end of the negative electrode foil 211 is located within the second insulating layer 24. This prevents the upper end of the negative electrode foil 211 from protruding from the electrolytic capacitor core 100, thus avoiding interference with the normal operation of the electrolytic capacitor.

[0159] Specifically, such as Figure 1 As shown, in one embodiment, the negative electrode foil assembly 21 further includes a pad foil 212 and a negative electrode conductive foil strip 213. The pad foil 212 is disposed on the inner periphery of the negative electrode foil 211; the negative electrode conductive foil strip 213 is disposed on the pad foil 212 and extends from the end of the electrolytic capacitor core 100 away from the bottom.

[0160] Specifically, such as Figure 1 As shown, in one embodiment, the positive electrode foil assembly 22 includes a positive electrode foil 221 and a positive electrode conductive strip 222. The positive electrode foil 221 is wound around the outer periphery of the core 10 in the circumferential direction; the positive electrode conductive strip 222 is disposed on the inner periphery of the positive electrode foil 221 and extends from the end of the electrolytic capacitor core 100 away from the bottom.

[0161] Specifically, such as Figure 1 As shown, in one embodiment, the end of the positive electrode foil 221 near the bottom has a vertical distance D2 from the end of the negative electrode foil 211 that is in contact with the bottom.

[0162] Specifically, such as Figure 1 As shown, in one embodiment, the vertical distance D2 ranges from 2mm to 2.5mm.

[0163] Furthermore, in one embodiment, the vertical distance D2 ranges from 2.4 mm.

[0164] Specifically, such as Figure 1 As shown, in one embodiment, the positive electrode foil 221 has a three-dimensional porous structure, which is constructed by stacking and sintering aluminum powder particles.

[0165] Specifically, such as Figure 2 and Figure 4As shown, in one embodiment, a composite three-dimensional electrode foil is used: this type of electrode foil has a more uniform heat distribution on the aluminum foil surface, avoiding the degradation of the positive electrode foil caused by local high temperature.

[0166] Specifically, such as Figure 3 and Figure 5 As shown, in one embodiment, the pore structure of the electrode foil in the prior art is sparse and uneven, which can easily cause local high temperatures and make the positive electrode foil more prone to deterioration.

[0167] Specifically, in one embodiment, the core 10 includes a third isolation layer and a fourth isolation layer. The third isolation layer is connected at one end to the first isolation layer 23; the fourth isolation layer is connected at one end to the second isolation layer 24; the core 10 is constructed by simultaneously winding the third isolation layer and the fourth isolation layer.

[0168] Specifically, in one embodiment, the third isolation layer and the first isolation layer 23 are an integral structure, and the fourth isolation layer and the second isolation layer 24 are an integral structure.

[0169] Specifically, in one embodiment, the first to fourth isolation layers are all made of isolation paper, the third isolation layer and the first isolation layer 23 are made of a single sheet of isolation paper, and the fourth isolation layer and the second isolation layer 24 are made of a single sheet of isolation paper.

[0170] Specifically, such as Figure 1 As shown, in one embodiment, the foil layer 20 is distributed at a position away from the center of the electrolytic capacitor core 100 and close to the outer peripheral surface of the electrolytic capacitor core 100.

[0171] Specifically, such as Figure 1 As shown, in one embodiment, the diameter of the core 10 is D3, and the value of the diameter D3 is in the range of 12mm≤D3≤15mm.

[0172] Furthermore, in one embodiment, the diameter D3 is 14 mm.

[0173] Specifically, such as Figure 1 As shown, in one embodiment, the negative electrode foil 211 is widened near the outer casing, and its lower end is wider than that of the positive electrode foil 221. The lower end of the negative electrode foil extends beyond the positive electrode foil 221 and the insulating paper by 1.0 to 1.5 mm beyond the edge of the insulating paper, so that the lower end of the negative electrode foil 211 exposed from the core (electrolytic capacitor core 100) can effectively contact and tightly adhere to the outer casing 200.

[0174] It should be noted that the electrolytic capacitor core 100 in this embodiment is an aluminum electrolytic capacitor formed by winding the positive electrode foil 221 and the negative electrode foil 211 with the separation of the insulating paper, then impregnating it with electrolyte, putting it into an aluminum shell, sealing it with a cover plate 300, and finally putting on a sleeve 502.

[0175] The specific manufacturing method is as follows: First, the positive electrode foil, negative electrode foil, and separator paper are cut to the required width using a slitting machine. Then, the positive and negative conductive strips are welded to the positive and negative electrode foils respectively using a winding machine. The core is then formed by winding, with electronic tape used to secure the wound core and prevent it from coming undone. Finally, the cover plate, outer shell, and impregnated core are assembled into the finished product using an assembly machine.

[0176] Specifically, electrolytic capacitors of the following specifications were manufactured using the above-described method: 410V 940μF, 450V 470μF, and 450V 680μF. Temperature rise tests were then conducted on these three specifications of electrolytic capacitors. The test data are shown in Table 1 below:

[0177] Table 1. Temperature rise test data of electrolytic capacitors

[0178]

[0179] Analysis of the data in the table above shows that, compared with the electrolytic capacitors in the prior art, the electrolytic capacitor in this embodiment has a 20% to 40% longer service life and a more than 10% lower core temperature rise.

[0180] like Figure 10 As shown, this utility model provides an electrolytic capacitor in the prior art. The electrolytic capacitor includes a shell 200', an electrolytic capacitor core 100', a cover plate 300', two lead terminals 400', and an insulating layer 500'. The cover plate 300' is disposed at the opening of the shell 200' and is used to seal the electrolytic capacitor core 100' within the shell 200'. The two lead terminals 400' pass through the cover plate 300' and are respectively connected to the negative and positive conductive foil strips of the electrolytic capacitor core 100'. The insulating layer 500' is sleeved on the outer periphery of the shell 200'.

[0181] Specifically, such as Figure 10 As shown, in one embodiment, the insulating layer 500' includes an insulating gasket 501' and a sleeve 502', wherein the insulating gasket 501' is laid on the bottom of the housing 200'; and the sleeve 502' is fitted on the outer periphery of the housing 200'.

[0182] Specifically, such as Figure 10 As shown, in one embodiment, the electrolytic capacitor core 100' does not contact the bottom of the housing 200'.

[0183] It should be noted that, because the electrolytic capacitor core 100' does not contact the bottom of the outer casing 200', the electrolytic capacitor core 100' is spaced apart from the bottom of the outer casing 200'. This results in lower heat conduction efficiency between the electrolytic capacitor core 100' and the bottom of the outer casing 200'. The heat conduction path can be found by referring to... Figure 11 .

[0184] Specifically, such as Figure 10 As shown, in one embodiment, the electrolytic capacitor core 100' is disposed within the casing 200' of the electrolytic capacitor, and the electrolytic capacitor core 100' includes a core 10', a foil layer 20', and an electronic tape 30'.

[0185] Although the present invention has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An electrolytic capacitor core, characterized in that, The electrolytic capacitor core is disposed within the outer casing of the electrolytic capacitor, and includes: Cabbage; A foil layer, which is wound circumferentially around the core; and Electronic tape, which is wound circumferentially around the foil layer along the core; The foil layer includes a negative electrode foil, which extends from one end of the foil layer near the bottom of the outer casing and contacts the bottom; the heat generated by the foil layer can be dissipated to the outside air in sequence through the negative electrode foil and the outer casing.

2. The electrolytic capacitor core according to claim 1, characterized in that, The vertical distance D1 extending from the end of the foil layer near the bottom is defined as the negative electrode foil. The value of the vertical distance D1 is in the range of 1mm ≤ D1 ≤ 1.5mm.

3. The electrolytic capacitor core according to claim 2, characterized in that, The foil layer includes: A positive electrode foil assembly, which is wound circumferentially around the outer periphery of the core; and A first insulating layer is wound circumferentially around the outer periphery of the positive electrode foil assembly along the core; and A negative electrode foil assembly, which is wound circumferentially around the outer periphery of the first insulating layer along the core, the negative electrode foil assembly including the negative electrode foil; and A second insulating layer is wound circumferentially around the outer periphery of the negative electrode foil assembly along the core. Wherein, the unfolded length of the positive electrode foil assembly is L1, the unfolded length of the first insulating layer is L2, the unfolded length of the negative electrode foil assembly is L3, and the unfolded length of the second insulating layer is L4, where L1 < L2 < L3 < L4.

4. The electrolytic capacitor core according to claim 3, characterized in that, The two ends of the first insulating layer are flush with the two ends of the second insulating layer, and the two ends of the first insulating layer are flush with the two ends of the core. The end of the negative electrode foil near the bottom has a vertical distance D1 from the end of the first insulating layer near the bottom.

5. The electrolytic capacitor core according to claim 3, characterized in that, The negative electrode foil assembly also includes: A pad foil, which is disposed on the inner periphery of the negative electrode foil; and A negative electrode conductive foil strip is disposed on the pad foil, the negative electrode conductive foil strip extending from one end of the electrolytic capacitor core away from the bottom.

6. The electrolytic capacitor core according to claim 3, characterized in that, The positive electrode foil assembly includes: A positive electrode foil, which is wound around the outer periphery of the core in the circumferential direction; A positive electrode conductive foil strip is disposed on the inner circumference of the positive electrode foil, the positive electrode conductive foil strip extending from one end of the electrolytic capacitor core away from the bottom.

7. The electrolytic capacitor core according to claim 6, characterized in that, The positive electrode foil has a vertical distance D2 between the end near the bottom and the end of the negative electrode foil that contacts the bottom.

8. The electrolytic capacitor core according to claim 7, characterized in that, The vertical distance D2 has a range of values: 2mm≤D2≤2.5mm.

9. The electrolytic capacitor core according to claim 7, characterized in that, The positive electrode foil has a three-dimensional porous structure, which is constructed by stacking and sintering aluminum powder particles.

10. The electrolytic capacitor core according to claim 3, characterized in that, The core includes: A third isolation layer, one end of which is connected to the first isolation layer; and The fourth isolation layer has one end connected to the second isolation layer; The core structure is formed by simultaneously winding the third isolation layer and the fourth isolation layer.

11. The electrolytic capacitor core according to claim 10, characterized in that, The third isolation layer is an integral structure with the first isolation layer, and / or the fourth isolation layer is an integral structure with the second isolation layer.

12. The electrolytic capacitor core according to any one of claims 1 to 11, characterized in that, The foil layer is distributed at a position away from the center of the electrolytic capacitor core and close to the outer peripheral surface of the electrolytic capacitor core.

13. The electrolytic capacitor core according to claim 12, characterized in that, The diameter of the core is D3, and the value of the diameter D3 is in the range of 12mm≤D3≤15mm.

14. An electrolytic capacitor, characterized in that, It includes: shell; as well as Electrolytic capacitor core as described in any one of claims 1 to 13; as well as A cover plate, disposed at the opening of the housing, the cover plate being used to seal the electrolytic capacitor core within the housing; and Two leads are provided through the cover plate, and the two leads are respectively connected to the negative electrode conductive foil and the positive electrode conductive foil of the electrolytic capacitor core; An insulating layer is fitted onto the outer periphery of the outer casing.

15. The electrolytic capacitor according to claim 14, characterized in that, The insulating layer includes: An insulating gasket, which is laid on the bottom of the housing; and A sleeve, which is fitted onto the outer periphery of the outer shell.

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