Stacked element and capacitor

Abstract

The application provides a laminated element and a capacitor. The laminated element comprises spacer films and substrates which are alternately laminated; each substrate is connected with a tab on the side edge; the tab comprises a root and an extension; the root is plate-shaped, and the side edge of the root is connected with the side edge of the substrate oppositely; in the plane of the substrate, the direction in which the root protrudes from the substrate is a first direction, and the direction perpendicular to the first direction is a second direction; the extension is strip-shaped, one end of the extension is connected with one side of the root, and the other end of the extension protrudes from the root along the second direction; and the extensions of different substrates are connected with each other at one end of the root. Therefore, the technical scheme of the application can improve the specific capacity of the capacitor.

Description

Technical Field

[0001] This application relates to the field of capacitors, specifically to a stacked element and a capacitor. Background Technology

[0002] With the development of intelligent industries, new requirements have been placed on capacitors. For example, AI servers need to accommodate as many processors as possible within a limited space. If the processors are too sparsely distributed, it will cause difficulties in information transmission between them. Therefore, the components surrounding the processors also need to be highly compact; otherwise, they will encroach on the installation space, forcing the processors to be placed far away. Existing capacitors are insufficient for such applications requiring high space utilization. Therefore, it is necessary to improve the specific capacitance of capacitors to adapt them to applications with high space utilization requirements. Summary of the Invention

[0003] The purpose of this application is to improve the specific capacitance of capacitors.

[0004] To address the aforementioned problems, in a first aspect, this application provides a stacked element comprising alternately stacked spacer films and substrates; each substrate has a tab connected to its side; each tab includes a root and an extension; the root has a receiving groove, is plate-shaped, and its side is connected to the side of the substrate; in the plane of the substrate, the direction in which the root protrudes from the substrate is a first direction, and the direction perpendicular to the first direction is a second direction; the extension is strip-shaped, one end of the extension is connected to one side of the root, and the other end protrudes from the root along the second direction; the ends of the extensions of different substrates protruding from the root are interconnected.

[0005] Optionally, the extension further protrudes from the root along the first direction and in a direction away from the substrate; the portion of the extension protruding from the root in the first direction is used for welding connection with an adjacent extension.

[0006] Optionally, adjacent extensions protrude from one end of the root along the second direction and abut against each other.

[0007] Optionally, the tab further includes a protrusion disposed on one end of the extension that protrudes from the root in the second direction; the protrusion protrudes from the extension to an adjacent extension to abut against the adjacent extension.

[0008] Optionally, the tab further includes a pad disposed between adjacent roots and connected to at least one adjacent root.

[0009] Optionally, the root portion and the substrate are integrally formed.

[0010] Optionally, the extension enters the receiving groove to connect with the root; the bottom of the receiving groove exposes the core material of the root.

[0011] Optionally, the stacked element further includes a fixing tape; the fixing tape is wound around the outer side of the substrate and the spacer film in the length direction along the axis of the first direction; Along the first direction, the side of the fixing tape facing away from the tab is flush with the spacer membrane, and the side of the fixing tape near the tab is also flush with the spacer membrane; the fixing tape covers the spacer membrane along the first direction.

[0012] Optionally, the substrate includes a cathode substrate and an anode substrate, the tab includes a cathode tab and an anode tab, the cathode tab includes a cathode root and a cathode extension, and the anode tab includes an anode root and an anode extension; The cathode substrate, the spacer film, and the anode substrate are stacked alternately in sequence; the cathode root is connected to the cathode substrate, and the anode root is connected to the anode tab; the entire anode tab and the entire cathode tab are arranged along the first direction; the anode extension is connected to the anode root and protrudes from the anode root along the first direction in a direction away from the cathode tab; the cathode extension is connected to the cathode root and protrudes from the cathode root along the first direction in a direction away from the anode tab.

[0013] Secondly, this application also provides a capacitor comprising the aforementioned stacked elements.

[0014] To electrically connect each substrate, tabs need to be connected. However, there is a spacer between the substrates, which creates a certain distance between adjacent substrates. If the tabs are directly pressed together along the lamination direction and then connected, the tabs need to have a large extension length from the side of the substrate along the tangent direction of the substrate surface. If this length is small, the tabs need to be tilted at a large angle to adjacent tabs during the pressing process to make contact and establish an electrical connection. This would excessively compress the spacer, causing it to thin or crack, which would lead to capacitor breakdown and damage. However, long tabs would also take up a lot of space, resulting in a smaller specific capacitance of the capacitor. In the technical solution of this application, the extension of the electrode protrudes from the root of the electrode along the second direction, and the ends of the extensions protruding from the electrode are connected to each other to electrically connect the electrodes of different substrates. In this way, only the ends of the extensions protruding from the substrate need to be close to each other for connection, without the need for the root of the electrode to be tilted at a large angle, so there is no risk of damaging the spacer. In this way, the overall length of the electrode protruding from the substrate along the first direction (which is also the length mentioned above) can be smaller, avoiding the space occupation caused by the electrode being too long, thereby improving the specific capacitance of the capacitor. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of this application. Those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0016] Figure 1 A schematic diagram of the exploded structure of a first embodiment of the stacked elements provided in this application; Figure 2 A schematic diagram of the substrate and tabs of a first embodiment of the stacked elements provided in this application; Figure 3 A top-view structural diagram of a second embodiment of the stacked elements provided in this application; Figure 4 A top-view structural diagram of the third embodiment of the stacked elements provided in this application; Figure 5 A top-view structural diagram of the fourth embodiment of the stacked elements provided in this application; Figure 6 An exploded structural diagram of the tabs of the fifth embodiment of the stacked elements provided in this application; Figure 7 A stereoscopic structural diagram of the sixth embodiment of the stacked elements provided in this application; Figure 8A top-view structural diagram of the sixth embodiment of the stacked elements provided in this application; Figure 9 The sixth embodiment of the stacked elements provided in this application is in Figure 8 Schematic diagram of the cross-sectional structure in the AA direction; Figure 10 The sixth embodiment of the stacked elements provided in this application is in Figure 9 A magnified structural diagram of part B in the middle section; Figure 11 The sixth embodiment of the stacked elements provided in this application is in Figure 9 A magnified structural diagram of section C; Figure 12 This is an exploded structural diagram of the capacitor provided in an embodiment of this application.

[0017] The reference numerals in the attached figures are as follows: Capacitor 102; Sealing cap 20; Lead-out terminal 27; Casing 30; Stacked elements 10; Substrate 11; Anode substrate 111; Cathode substrate 112; 12 septum membranes; Tab 13; Anode tab 131; Anode root 1311; Anode extension 1312; Cathode tab 132; Cathode root 1321; Cathode extension 1322; Root 133; Receiving groove 1331; Extension 134; Oxide film 1371; Core material 1372; Protrusion 138; Pad 139; Fixing tape 15. Detailed Implementation

[0018] The following will refer to the appendices in this application. Figure 1 To be continued Figure 12 The technical solutions in this application are clearly and completely described in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0019] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0020] The technical solution of this application is applicable to electrolytic capacitors, such as aluminum electrolytic capacitors. Among them, aluminum electrolytic capacitors are widely used in precision electronic equipment such as AI servers due to their characteristics of self-healing, large specific capacitance, aging resistance, and high cost performance.

[0021] In the context of multilayer capacitors, "multilayer" is a concept relative to "winding" in wound capacitors. Specifically, it refers to the shape of the capacitor's core (or core). Wound capacitors have a coiled core, with the cathode and anode foils wound into a cylindrical shape; typically, only one cathode and anode foil are used. In contrast, multilayer capacitors have a cathode substrate (in sheet form) and an anode substrate stacked together, usually with multiple cathode and anode substrates. It should be noted that in this application, "multilayer" is used to describe the shape of the capacitor's core and does not limit the type of capacitor; the capacitor can be solid, semi-solid, or liquid, etc.

[0022] Among them, multilayer capacitors are favored by technicians in the field of precision electronic equipment due to their smaller ESR (Equivalent Series Resistance) and ESL (Equivalent Series Inductance).

[0023] However, the specific capacitance (capacitance per unit volume) of capacitors needs to be further improved. In traditional capacitors, the elements, such as the tabs, need to protrude a considerable length from the substrate, thus encroaching on the substrate's mounting space and causing a decrease in specific capacitance.

[0024] To solve the above problems, please refer to Figure 1 and Figure 2 In a first aspect, this application provides a stacked element 10, including spacer films 12 and substrates 11 stacked alternately; each substrate has a tab 13 connected to its side; the tab includes a root portion 133 and an extension portion 134; the root portion is plate-shaped, and the side of the root portion is connected to the side of the substrate; in the plane of the substrate, the direction in which the root portion protrudes from the substrate is a first direction, and the direction perpendicular to the first direction is a second direction; the extension portion is strip-shaped, one end of the extension portion is connected to one side of the root portion, and the other end protrudes from the root portion along the second direction; the ends of the extension portions of different substrates that protrude from the root portion are connected to each other.

[0025] A capacitor cell refers to the smallest unit in a capacitor that can produce capacitance. A capacitor cell is formed by stacking a cathode substrate and an anode substrate opposite each other (with a certain gap between them to avoid short circuits). In use, the anode substrate is connected to the anode of the external circuit, and the cathode substrate is connected to the cathode of the external circuit. When there is a potential difference between the anode and cathode, charge can be stored between the anode and cathode substrates, forming a capacitor. The capacitor cell of this application is applicable to use in solid-state capacitors, semi-solid-state capacitors, and liquid capacitors.

[0026] visible Figure 1 The image shown represents a single capacitor cell. Stacking individual capacitor cells together forms a stacked element. Please refer to [reference needed]. Figure 7 That is, to adopt Figure 1 The stacked elements are formed by stacking individual capacitor cells in the capacitor.

[0027] Please refer to Figure 1 A spacer membrane, typically electrolytic paper, is placed between the cathode substrate and the anode substrate. When used in semi-solid or liquid capacitors, it can absorb the electrolyte. In this case, the cathode substrate guides the distribution of the electric field. The actual capacitor is formed between the anode substrate and the electrolyte. That is, the dielectric of the capacitor is the oxide layer on the surface of the anode substrate. Positive charges accumulate on the side of the oxide layer closer to the core material of the anode substrate, and negative charges accumulate on the side closer to the electrolyte.

[0028] A tab is a component that connects to a substrate and is used to connect the substrate to an external circuit. Therefore, a cathode substrate has a cathode tab, and an anode substrate has an anode tab. The cathode tabs of different cathode substrates are connected to each other, thereby electrically connecting the cathode substrates to each other; the anode tabs of different anode substrates are connected to each other, thereby electrically connecting the anode substrates to each other.

[0029] Please refer to Figure 1 In this application, the substrate refers to the cathode substrate 112 and the anode substrate 111, and the tab refers to the cathode tab 132 and the anode tab 131. The extensions of the different substrates protruding from the root end are connected to each other, which means that the extensions of the cathode tab are electrically connected to each other, and the extensions of the anode tab are electrically connected to each other. However, the extensions of the cathode tab and the extensions of the anode tab are not connected, that is, the anode substrate and the cathode substrate cannot be electrically connected, otherwise a short circuit will occur.

[0030] Therefore, the fact that at least one end of the extension is distributed in the direction of the tab on the adjacent substrate to be electrically connected to the tab on the adjacent substrate also refers to the relationship between tabs of the same polarity. Taking a cathode tab as an example, the extension of the cathode tab is distributed in the direction of the cathode tab on the adjacent cathode substrate. In this application, unless otherwise specified, when describing the relationship between tabs, the relationship between substrates, and the relationship between tabs and substrates, it refers to the relationship between any two elements of the same polarity (anode or cathode).

[0031] The entire electrode can be connected to an external circuit via lead-out terminals. For an example, please refer to [reference needed]. Figure 12 As can be seen, the capacitor's sealing cap 20 is provided with two lead terminals 27. The sealing cap is placed on the opening of the outer shell 30 to enclose the stacked element together with the outer shell, providing a stable working environment for the stacked element. The lead terminals are inserted through the sealing cap (in other embodiments, they can also be inserted through the outer shell), with one end inside the outer shell and electrically connected to the tab, and the other end outside the outer shell and electrically connected to the outside, so that the stacked element can be connected to the external circuit.

[0032] The base of the tab is plate-shaped, and the side of the tab is connected to the side of the substrate. Understandably, this means that the base is not connected to the surface of the substrate, and there is no tab to block the substrate and the spacer film. They can be tightly stacked, which improves the specific capacity.

[0033] The root can be connected to the substrate by welding and / or bonding with conductive adhesive, as will be seen below, or the root can be integrally formed with the substrate.

[0034] The extension is a component of the electrode lug used to connect to other electrode lugs. The extension is strip-shaped because it has one end inside the root and another end protruding from the root. The end of the extension inside the root refers to the portion of the extension projected orthographically onto the root that lies within the root; the end of the extension outside the root refers to the portion of the extension projected orthographically onto the root that lies outside the root. Therefore, the strip shape of the extension does not have to be a strip in the conventional sense; it only needs to have the aforementioned two ends.

[0035] The root is connected to the edge of the substrate and is plate-shaped. Therefore, the direction in which the root protrudes from the substrate is also within the plane of the substrate. The direction in which the root protrudes from the substrate is the first direction. For an example, please refer to [reference needed]. Figure 2 , Figure 2 The y-axis direction (regardless of positive or negative) is the first direction. Within the plane of the substrate, the direction perpendicular to the first direction is the second direction. For an example, please refer to... Figure 2 , Figure 2 The x-axis direction (regardless of whether it is positive or negative) is the second direction.

[0036] As described above, the two ends of the extension are as follows: the end where the orthographic projection of the extension onto the root is located inside the root can be directly connected to the root. It should be noted that this end may not contact the surface of the substrate, avoiding a gap between the substrate and the spacer film, allowing the substrate and spacer film to be tightly stacked and improving specific capacity. The end where the orthographic projection of the extension onto the root is located outside the root is equivalent to protruding from the root, and its protrusion direction is along the second direction, meaning it does not substantially encroach on the space in the first direction.

[0037] It is understandable that large-angle tilting of adjacent tabs may cause the substrate to bend, which in turn leads to the cracking of the oxide film on the substrate. Avoiding large-angle tilting of adjacent tabs can protect the oxide film on the substrate surface.

[0038] Please refer to Figure 8 and Figure 9 In one example, the space occupied by the electrode can be calculated as follows: Figure 8 In the middle, the product of the dimensions of the stacked elements along the x-axis and y-axis (i.e., Figure 8 (area occupied by intermediate-layer primes), then multiplied by Figure 9 The pole lug along the y-axis ( Figure 9 The diagram shows the height of the cathode extension and cathode root (i.e., the cathode tab) protruding from the substrate. The product of these three parameters is the total space occupied by the tab. It can be seen that reducing the height of the tab protruding from the substrate can reduce the space occupied by the tab, thereby increasing the specific capacitance of the capacitor.

[0039] It is evident that by making the extension protrude beyond the root in the second direction, the space in the first direction can be avoided. In the example above, this is equivalent to reducing the height of the tab protruding from the substrate, which can improve the specific capacitance of the capacitor.

[0040] It should be noted that while a solution that directly presses the roots together to connect them without providing extensions might seem to eliminate the need for any change in the height of the tabs protruding from the substrate in the first direction, in reality, such a solution requires the roots to protrude from the substrate by a considerable amount. This is because if the protrusion is too low, the tabs will compress the spacer when they approach each other, potentially damaging it and causing a short circuit between the cathode and anode substrates. Therefore, the roots need to be extremely long, with the ends furthest from the substrate connecting to each other, so that the ends closer to the substrate do not damage the spacer.

[0041] Please refer to Figure 2 Optionally, the extension also protrudes from the root along the first direction and toward the direction away from the substrate; the portion of the extension protruding from the root in the first direction is used for welding connection with an adjacent extension.

[0042] Because the root needs to be connected to the substrate, the surface structure is restricted. For example, when the root is integrally formed with the substrate, the surface structure of the root and the substrate are completely consistent, that is, the surface may have a thicker oxide layer (especially for anode substrates); or the root may need to have the same thickness as the substrate, but in order to ensure that the specific capacitance of the capacitor is sufficient, the substrate may make the root thinner and the strength lower.

[0043] The extension, which is a component that connects to the root later, is not subject to the above constraints. Its surface may have a thin oxide film or no oxide film, making it easy to solder. Therefore, the portion protruding from the root along the first direction and away from the substrate can be used for soldering. In one example, please refer to... Figure 2 As can be seen, along the positive y-axis, the extension is higher than the root, that is, the extension protrudes from the root along the first direction. It can be understood that this part of the extension can be easily welded to each other.

[0044] It should be noted that this welding only serves as an auxiliary connection and does not require tight welding. Therefore, the tabs do not need to be tightly abutted against each other, thus avoiding damage to the spacer membrane. The portion of the extension that protrudes from the root in the first direction does not necessarily cause a significant increase in the height of the tabs, thereby avoiding excessive encroachment on the substrate's mounting space.

[0045] The welding of the portion of the extension that protrudes from the root in the first direction away from the substrate primarily serves a load-bearing function. For an example, please refer to... Figure 12 To secure the stacked element within the housing and prevent it from shifting along the first direction, the lead-out terminal can directly press against the tab along the first direction, pressing the stacked element firmly against the inner wall of the housing to prevent it from shifting. This welding method improves the tab's load-bearing capacity on the lead-out terminal, allowing the lead-out terminal to secure the stacked element with a stronger force.

[0046] Please refer to Figure 3 Optionally, adjacent extensions protrude from one end of the root along the second direction and abut against each other.

[0047] In this embodiment, adjacent extensions directly abut against each other, without relying on intermediate parts for indirect contact. For one example, please refer to... Figure 3 With the positive y-axis direction in the diagram as top and the negative y-axis direction as bottom, the upper extension deforms downward and the lower extension deforms upward, thus directly contacting the middle extension at the same time.

[0048] The directly abutting extensions can also be directly welded to each other. Welding is a convenient and stable connection method that increases the connection strength between the extensions and reduces resistance. Furthermore, in Figure 3As can be seen in the illustrated embodiment, since the extension bears the deformation role, the root can remain basically undeformed, thereby avoiding damage to the septum by the root.

[0049] Please refer to Figure 4 Optionally, the electrode tab also includes a protrusion 138, which is disposed on one end of the extension that protrudes from the root in a second direction; the protrusion protrudes from the extension to the adjacent extension to abut against the adjacent extension.

[0050] The bump is located on one end of the extension that protrudes from the root in the second direction. This means that at least a portion of the bump's orthogonal projection onto the root also protrudes from the root in the second direction, and the portion protruding from the root is connected to the root. The bump is a conductor, so when the bump abuts against the extension of another tab, the two tabs form an electrical connection.

[0051] The term "protrusion from the extension to the adjacent extension" means that, for a given tab, the protrusion belonging to that tab protrudes from the extension of the tab adjacent to it in the direction of the extension of that tab. For an example, please refer to... Figure 4 With the positive y-axis direction as top and the negative y-axis direction as bottom in the figure, the upper bump belongs to the uppermost extension, and it can be seen that it protrudes from the uppermost extension towards the middle extension; the lower bump belongs to the lowermost extension, and it can be seen that it protrudes from the lowermost extension towards the middle extension.

[0052] Figure 4 The embodiment shown can also be understood as follows: both protrusions in the figure belong to the middle extension. It can be seen that the protrusions protrude along the positive and negative directions of the y-axis and the directions of the upper and lower extensions adjacent to the middle extension.

[0053] It is evident that the protrusion of the bump can fill the gap between the extensions, allowing the extensions themselves to remain essentially undeformed, thereby preventing the extensions from causing deformation of the root and further preventing the root from damaging the septum.

[0054] It should be noted that the protrusion can be integrally formed with the extension or welded to the extension.

[0055] Please refer to Figure 5 Optionally, the electrode also includes a pad 139, which is disposed between adjacent roots and connected to at least one adjacent root.

[0056] The pads are placed between adjacent roots to fill the gaps between them and provide mutual support. This can prevent the roots from tilting to the adjacent roots and damaging the spacer membrane, and can also improve the overall load-bearing capacity of the tab (such as the pressure from the lead-out terminals mentioned above).

[0057] The spacer block can be a metal component or welded to the root or extension to improve integrity. The spacer block can also be an insulator, bonded or interference-fitted between adjacent roots. It should be noted that the spacer block may not directly abut against the root, as an extension is provided on one side of the root, allowing the spacer block to abut against the extension to support the root.

[0058] It should be noted that the above-mentioned embodiments of direct contact between extensions, protrusions between extensions, and pads between roots can be combined with each other for two reasons: First, the protrusions and pads are positioned differently, so both can be provided or only one of them can be provided; second, a stacked element often has multiple tabs of the same polarity, so the extensions of some tabs can directly contact each other, while the extensions of some tabs can contact each other through protrusions.

[0059] Please refer to Figure 2 Optionally, the root and the substrate are integrally molded.

[0060] The substrate and the root are integrally molded. This means that when the substrate is manufactured using processes such as shearing or punching, a portion of the structure protruding from the substrate edge is retained as the root. Since both the substrate and the root are plate-shaped, there is no need for secondary molding of the root, and the edge of the root naturally connects to the edge of the substrate. This clearly improves manufacturing efficiency.

[0061] Please refer to Figure 6 Optionally, a receiving groove 1331 is provided on the root, and the extension enters the receiving groove to connect with the root; the bottom of the receiving groove exposes the core material of the root.

[0062] If the core material at the root is exposed in the receiving groove, the extension can be directly connected to the core material at the root, which can avoid the influence of the oxide layer on the root surface and reduce the resistance.

[0063] In one example, please refer to Figure 6 , Figure 6 The structure shown is a cross-section, which can be understood as a section that is parallel to both the surface normal direction of the substrate and the first direction. It can be seen that on the cross-section, the core material 1372 of the substrate is exposed to the bottom of the receiving groove, which is equivalent to removing the oxide film 1371.

[0064] Please refer to Figure 7 , Figure 8 and Figure 9 Optionally, the stacked element also includes a fixing tape 15; the fixing tape is wound around the outer side of the substrate and the spacer in the length direction along the axis of the first direction; along the first direction, the side of the fixing tape facing away from the tab is flush with the spacer, and the side of the fixing tape near the tab is also flush with the spacer; the fixing tape covers the spacer along the first direction.

[0065] The fixing tape is wrapped around the outer side of the substrate and spacer to secure them together, preventing them from coming apart and facilitating the insertion of the stacked elements into the capacitor casing. The axis of the fixing tape is typically along the first direction, passing through the geometric center of the entire spacer and substrate.

[0066] Please refer to Figure 9 , Figure 10 and Figure 11 In all three graphs, the y-axis direction is the first direction, indicating that along the y-axis direction... Figure 10 In the middle, the highest points of the fixing tape and the spacer membrane in the y-axis direction (the positive y-axis direction is the height direction) are the same. Figure 11 In the middle, the lowest point of the fixing tape and the spacer membrane is the same in the y-axis direction, which is the case that "along the first direction, the side of the fixing tape facing away from the electrode tab is flush with the spacer membrane, and the side of the fixing tape near the electrode tab is also flush with the spacer membrane".

[0067] The above-mentioned flush situation can also be understood as the spacer being projected onto the fixing tape. Along the first direction, the above-mentioned projection of the spacer does not exceed the fixing tape, and the edge of the spacer in the first direction overlaps with the edge of the fixing tape in the first direction.

[0068] The term "fixing tape covering the spacer along the first direction" means that the spacer is projected orthographically onto the fixing tape, and the orthographic projection of the fixing tape does not exceed the spacer. It should be noted that the above explanation of the projection relationship applies to both the spacer as a whole and the fixing tape as a whole. This is because a single stacked element can have multiple spacers (if the stacked element is set in the form of a capacitor unit, there may only be one spacer), and a single stacked element can also have multiple fixing tapes.

[0069] It should be noted that since the fixing tape is wrapped around the entire outer side of the substrate and the element, it is cylindrical in shape and has sides with different surface normal directions. The above projection relationship can be the projection relationship of any side, or it can be true for all sides.

[0070] As can be seen, the fixing tape covering the spacer membrane and being flush with both sides of the spacer membrane along the first direction can provide a larger range of fixation for the spacer membrane and the substrate, thereby improving the overall strength of the stacked elements.

[0071] It should be noted that the fact that the fixing tape is flush with the spacer film does not mean that the fixing tape is also flush with the substrate. For an example, please refer to... Figure 11As can be seen, the lowest point of the anode substrate along the y-axis is above the lowest point of the fixing tape along the y-axis; while the lowest point of the cathode substrate along the y-axis is below the lowest point of the fixing tape along the y-axis. In this way, the anode substrate can be isolated by the fixing tape, avoiding short circuits caused by contact between the anode substrate and the casing or other structures, while the cathode substrate can be exposed, thus directly contacting the casing for heat dissipation.

[0072] Please refer to Figure 8 , Figure 9 and Figure 10 Optionally, the substrate includes a cathode substrate and an anode substrate, and the tabs include a cathode tab and an anode tab. The cathode tab includes a cathode root 1321 and a cathode extension 1322, and the anode tab includes an anode root 1311 and an anode extension 1312. The cathode substrate, the spacer film, and the anode substrate are stacked alternately in sequence. The cathode root is connected to the cathode substrate, and the anode root is connected to the anode tab. The entire anode tab and the entire cathode tab are arranged along a first direction. The anode extension is connected to the anode root and protrudes from the anode root in the first direction away from the cathode tab. The cathode extension is connected to the cathode root and protrudes from the cathode root in the first direction away from the anode tab.

[0073] In one example, please refer to Figure 8 As can be seen, the cathode extension protrudes from the cathode root along the negative x-axis in the figure, and the anode extension protrudes from the anode root along the positive x-axis in the figure. This is the case in the above embodiment where the anode extension protrudes from the anode root along the first direction away from the cathode tab, and the cathode extension protrudes from the cathode root along the first direction away from the anode tab.

[0074] It is understandable that the interconnection between the extensions may generate high heat (e.g., by welding), or may require the use of conductive materials such as conductive adhesive. Improper operation may damage the substrate or spacer. The above embodiment can keep the interconnection positions of the anode extensions and the interconnection positions of the cathode extensions as far apart as possible. On the one hand, it provides sufficient connection space for the two, and on the other hand, it avoids mutual interference during the connection process, which may cause the heat of the connection process (which may burn the spacer or substrate) or the adhesive (which may conduct electricity between the positive and negative substrates, causing a short circuit) to damage the substrate or spacer.

[0075] It should be noted that the anode extension and the cathode extension can respectively adopt the embodiments described above for the extension; the anode root and the cathode root can respectively adopt the embodiments described above for the root.

[0076] Please refer to Figure 12 Secondly, this application also provides a capacitor 102, comprising the aforementioned stacked elements.

[0077] It should be noted that the stacked elements and capacitors in the embodiments of this application are different subjects under the same inventive concept. Features not described in detail in each embodiment can be referred to in the description of other embodiments. Under the premise of no conflict, the embodiments can be combined arbitrarily, and the combined solution is also within the protection scope of the embodiments of this application.

[0078] It should be noted that the term "multiple" in this application generally refers to two or more. Furthermore, directional terms used in the embodiments of this application, such as "up," "down," "front," "back," "left," "right," "inner," "outer," and "side," are only for reference to the accompanying drawings. Therefore, the directional terms used are for illustrating and understanding the embodiments of this application, and not for limiting the embodiments of this application. The term "connection" in this application generally refers to a direct connection between two components or an indirect connection achieved through other components. In the various figures, structurally similar units are represented by the same reference numerals. For clarity, the various parts in the figures are not drawn to scale. Additionally, some related parts may not be shown in the figures.

[0079] It should be understood that in the description of this application, terms such as "first" and "second" are used only to distinguish similar objects and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0080] It is understood that those skilled in the art can combine various implementation methods in the above embodiments under the guidance of the above examples to obtain technical solutions with multiple implementation methods. The above descriptions are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

[0081] The stacked elements and capacitors provided in this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A stacked element, characterized in that, Includes spacer films and substrates that are alternately stacked; Each of the substrates has a tab connected to its side; The electrode tab includes a root and an extension; the root is provided with a receiving groove, is plate-shaped, and the side of the root is connected to the side of the substrate; in the plane of the substrate, the direction in which the root protrudes from the substrate is a first direction, and the direction perpendicular to the first direction is a second direction. The extension is strip-shaped, with one end connected to one side of the root and the other end protruding from the root along the second direction; the protruding ends of the extensions of different substrates are connected to each other. The tab further includes a protrusion disposed on one end of the extension that protrudes from the root in the second direction; the protrusion protrudes from the extension to an adjacent extension to abut against the adjacent extension.

2. The stacked element according to claim 1, characterized in that, The extension also protrudes from the root along the first direction and in a direction away from the substrate; the portion of the extension protruding from the root in the first direction is used for welding connection with an adjacent extension.

3. The stacked element according to claim 1, characterized in that, The adjacent extensions protrude from one end of the root along the second direction and abut against each other.

4. The stacked element according to claim 1, characterized in that, The electrode tab also includes a pad, which is disposed between adjacent roots and connected to at least one of the adjacent roots.

5. The stacked element according to claim 1, characterized in that, The root portion and the substrate are integrally formed.

6. The stacked element according to claim 5, characterized in that, The extension enters the receiving groove to connect with the root; the bottom of the receiving groove exposes the core material of the root.

7. The stacked element according to claim 1, characterized in that, The stacked element also includes a fixing tape; the fixing tape is wrapped around the outer side of the substrate and the spacer film in the length direction along the axis of the first direction; Along the first direction, the side of the fixing tape facing away from the tab is flush with the spacer membrane, and the side of the fixing tape near the tab is also flush with the spacer membrane; the fixing tape covers the spacer membrane along the first direction.

8. The stacked element according to claim 1, characterized in that, The substrate includes a cathode substrate and an anode substrate, the tabs include a cathode tab and an anode tab, the cathode tab includes a cathode root and a cathode extension, and the anode tab includes an anode root and an anode extension; The cathode substrate, the spacer film, and the anode substrate are stacked alternately in sequence; the cathode root is connected to the cathode substrate, and the anode root is connected to the anode tab; the entire anode tab and the entire cathode tab are arranged along the first direction; the anode extension is connected to the anode root and protrudes from the anode root along the first direction in a direction away from the cathode tab; the cathode extension is connected to the cathode root and protrudes from the cathode root along the first direction in a direction away from the anode tab.

9. A capacitor, characterized in that, Including the stacked elements as described in any one of claims 1-8.

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