Super capacitor cell and capacitor

Abstract

The invention discloses a super capacitor cell and a capacitor. The cell comprises inner-layer electrolytic paper, a positive electrode aluminum foil, middle-layer electrolytic paper and a negative electrode aluminum foil. Wherein the positive electrode aluminum foil comprises a positive electrode base layer aluminum foil and a positive electrode pure aluminum layer; the negative electrode aluminum foil comprises a negative electrode base layer aluminum foil and a negative electrode pure aluminum layer; the extension directions of the positive electrode pure aluminum layer and the negative electrode pure aluminum layer are opposite; the thickness of the positive electrode base layer aluminum foil is greater than that of the positive electrode pure aluminum layer, and / or the thickness of the negative electrode base layer aluminum foil is greater than that of the negative electrode pure aluminum layer. According to the super capacitor cell and the capacitor, the current carrying capacity of the current and the charging and discharging functions of the capacitor can be greatly improved, and the safety performance of the capacitor in the heavy load scene of frequent rapid acceleration and energy recovery is further improved.

Description

Technical Field

[0001] This invention belongs to the field of electronic device technology, and in particular relates to a supercapacitor cell and capacitor. Background Technology

[0002] Currently, in light-load applications such as computer data storage power supply, low-voltage power supply, instrument data security, and power supply filtering below 48V, traditional supercapacitors are widely used due to their advantages such as fast charging and discharging speed and long cycle life.

[0003] However, with the development of new energy, smart grids, and large industrial equipment, extremely high requirements have been placed on the instantaneous power output capability of energy storage devices, namely, supercapacitors that can withstand instantaneous currents of hundreds or even thousands of amperes. Therefore, in the fields of high-power energy feeding, energy storage, and power supply, traditional supercapacitors do not perform well, with their discharge current being too small. In particular, with a string charge-discharge life of 500,000 cycles and a single cell discharge of 1 million cycles, the overall performance cannot be fully utilized.

[0004] As a crucial component of capacitors, the battery cell has a significant impact on capacitor performance. In new energy vehicles, under heavy-load scenarios involving frequent rapid acceleration and energy recovery, the shortcomings of traditional supercapacitor cells become increasingly prominent. Capacitors manufactured using traditional supercapacitor cells can no longer meet the requirements of new energy vehicles. Therefore, it is necessary to conduct research and development to provide a solution for supercapacitor cells that can meet the needs of heavy-load charging and discharging scenarios in new energy vehicles and other similar applications.

[0005] The above background information is provided only to aid in understanding the inventive concept and technical solution of this invention. It does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above information was disclosed on the filing date of this patent application, the above background information should not be used to evaluate the novelty and inventiveness of this application. Summary of the Invention

[0006] The purpose of this invention is to provide a supercapacitor cell and capacitor to solve at least one of the problems mentioned above in the background section.

[0007] To achieve the above objectives, the technical solution of this invention is implemented as follows: A supercapacitor cell includes an inner layer of electrolytic paper, a positive electrode aluminum foil, an intermediate layer of electrolytic paper, and a negative electrode aluminum foil; wherein, the positive electrode aluminum foil includes a positive electrode base aluminum foil and a positive electrode pure aluminum layer extending from one longitudinal edge of the positive electrode base aluminum foil; the negative electrode aluminum foil includes a negative electrode base aluminum foil and a negative electrode pure aluminum layer extending from one longitudinal edge of the negative electrode base aluminum foil; the thickness of the positive electrode pure aluminum layer and / or the negative electrode pure aluminum layer is 30-50 μm, and the aluminum purity is 99.999% or higher; the extension directions of the positive electrode pure aluminum layer and the negative electrode pure aluminum layer are opposite; the thickness of the positive electrode base aluminum foil is greater than the thickness of the positive electrode pure aluminum layer, and / or the thickness of the negative electrode base aluminum foil is greater than the thickness of the negative electrode pure aluminum layer.

[0008] In some embodiments, the inner electrolytic paper, positive electrode aluminum foil, intermediate electrolytic paper, and negative electrode aluminum foil are wound together; wherein, one end of the battery cell is a wound multilayer positive electrode pure aluminum layer, and the other end is a wound multilayer negative electrode pure aluminum layer.

[0009] In some embodiments, the outer surface of the wound cell is a positive electrode aluminum foil layer, a ring of electrolytic paper, and a ring of negative electrode pure aluminum layer.

[0010] In some embodiments, one end of the battery cell leads to the positive terminal of the capacitor, and the other end leads to the negative terminal of the capacitor.

[0011] Another technical solution of the present invention is a capacitor, which includes a battery cell as described in any of the foregoing technical solution embodiments, an aluminum shell for housing the battery cell, and a terminal cover plate assembly for encapsulating the battery cell in the aluminum shell.

[0012] In some embodiments, the terminal cover assembly includes a cover body, a bolted conductive post and an explosion-proof valve mounted on the cover body, an anchor, and a rubber ring disposed between the anchor and the cover body.

[0013] In some embodiments, the anchor is electrically connected to the aluminum shell, leading out the positive or negative terminal of the capacitor.

[0014] In some embodiments, the cover plate body is in the shape of a three-tiered frustum, which includes a first frustum, a second frustum and a third frustum.

[0015] In some embodiments, the bolt conductive post is provided with an annular boss, the annular boss including a first boss, a second boss and a third boss.

[0016] In some embodiments, the bolt conductive post has a threaded hole along its central axis, and the inner wall of the threaded hole has an internal thread for connection with an external stud.

[0017] The beneficial effects of the technical solution of this invention are: Compared with existing technologies, the supercapacitor cell and capacitor of this invention can greatly improve the current carrying capacity and the charging and discharging function of the capacitor, thereby improving the safety performance of the capacitor in heavy-load scenarios with frequent rapid acceleration and energy recovery. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a three-dimensional schematic diagram of a supercapacitor cell according to an embodiment of the present invention; Figure 2 This is a partial cross-sectional schematic diagram of a supercapacitor cell according to an embodiment of the present invention; Figure 3 This is a partial cross-sectional view of a supercapacitor cell according to an embodiment of the present invention from another direction; Figure 4 yes Figure 2 A magnified view of part A in the diagram; Figure 5 yes Figure 3 A magnified view of part B in the diagram; Figure 6 This is a three-dimensional schematic diagram of a capacitor using a supercapacitor cell according to an embodiment of the present invention; Figure 7 yes Figure 6 Partially disassembled schematic diagram; Figure 8 yes Figure 6 Another decomposition diagram; Figure 9 yes Figure 6 A three-dimensional schematic diagram of the capacitor terminal cover assembly; Figure 10 This is a three-dimensional schematic diagram of the cover plate of the 6 capacitor; Figure 11 yes Figure 10 Cross-sectional diagram; Figure 12 yes Figure 10 A three-dimensional schematic diagram of a bolt-driven conductive post; Figure 13 yes Figure 10 A three-dimensional schematic diagram of the anchor; Figure 14 This is a three-dimensional schematic diagram of a supercapacitor according to another embodiment of the present invention; Figure 15This is an exploded view of a supercapacitor according to another embodiment of the present invention; Figure 16 This is a perspective view of a terminal cover assembly of a supercapacitor according to another embodiment of the present invention; Figure 17 This is a three-dimensional schematic diagram from another angle of the terminal cover plate assembly of a supercapacitor according to another embodiment of the present invention; Figure 18 This is a cross-sectional schematic diagram of the cover plate body of a supercapacitor according to another embodiment of the present invention; Figure 19 This is a three-dimensional schematic diagram of the terminal conductive post of a supercapacitor according to another embodiment of the present invention; Figure 20 This is a three-dimensional schematic diagram of the terminal conductive post of a supercapacitor according to another embodiment of the present invention from another angle. Detailed Implementation

[0020] To make the technical problems, technical solutions, and beneficial effects of the embodiments of the present invention clearer and more understandable, and to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0021] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as "connected to" another component, it can be directly connected to or indirectly connected to that other component. Furthermore, a connection can be for both fixing and circuit connection purposes.

[0022] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of the present invention, unless otherwise expressly specified and limited, "a plurality of" means two or more. Terms such as "installed," "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or a connection within two components or an interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0024] Reference Figures 1-5 As shown in one embodiment of the present invention, a supercapacitor cell 200 is provided, comprising an inner layer of electrolytic paper 20, a positive electrode aluminum foil 21, an intermediate layer of electrolytic paper 22, and a negative electrode aluminum foil 23; wherein, the positive electrode aluminum foil 21 comprises a positive electrode base layer aluminum foil 210 and a positive electrode pure aluminum layer 211 extending from one longitudinal edge of the positive electrode base layer aluminum foil 210; the negative electrode aluminum foil 23 comprises a negative electrode base layer aluminum foil 230 and a negative electrode pure aluminum layer 211 extending from one longitudinal edge of the negative electrode base layer aluminum foil 230. The positive electrode pure aluminum layer 231 has a thickness of 30-50 μm and an aluminum purity of 99.999% or higher. The positive electrode pure aluminum layer 211 and the negative electrode pure aluminum layer 231 extend in opposite directions. The thickness of the positive electrode base aluminum foil 210 is greater than the thickness of the positive electrode pure aluminum layer 211, and / or the thickness of the negative electrode base aluminum foil 230 is greater than the thickness of the negative electrode pure aluminum layer 231.

[0025] In some embodiments, the thickness of the positive electrode base aluminum foil 210 is greater than or equal to twice the thickness of the positive electrode pure aluminum layer 211; the thickness of the positive electrode pure aluminum layer 211 is greater than or equal to the thickness of the inner electrolytic paper 20 or the intermediate electrolytic paper 22.

[0026] Reference Figures 2-5 As shown, the inner electrolytic paper 20, positive electrode aluminum foil 21, intermediate electrolytic paper 22, and negative electrode aluminum foil 23 are wound together to form the battery cell 2. The positive electrode pure aluminum layer 211 of the positive electrode aluminum foil 21 and the negative electrode pure aluminum layer 231 of the negative electrode aluminum foil 23 do not overlap. One end of the battery cell 200 is a wound multi-layer positive electrode pure aluminum layer 211, and the other end of the battery cell 200 is a wound multi-layer negative electrode pure aluminum layer 231. (Refer to...) Figure 3As shown, in some embodiments, the outer surface of the wound cell is a positive aluminum foil layer 21, a ring of electrolytic paper layer 22, and a ring of negative pure aluminum layer 231. With this arrangement, the positive electrode is led out at one end of the cell 200 and the negative electrode is led out at the other end, thereby placing the current collectors at both ends of the capacitor, which facilitates the design of the capacitor, reduces costs, and improves the current carrying capacity and charging / discharging function of the aluminum electrolytic capacitor.

[0027] Reference Figures 2-5 As shown, the positive electrode base aluminum foil 210 and the negative electrode base aluminum foil 230 have the same structure. The following description will only take the positive electrode base aluminum foil 210 as an example. The positive electrode base aluminum foil 210 includes a thick pure aluminum foil layer 2100 and an aluminum foil surface layer 2101 symmetrically arranged on both sides of the thick pure aluminum foil layer 2100. In some embodiments, the thickness of the aluminum foil surface layer 2101 is 120-200 μm. The aluminum foil surface layer 2101 uses a polymer conductive polymer network to obtain a physical model of a super-low impedance composite discharge circuit. Specifically, by uniformly dispersing and coating the thick pure aluminum foil layer 2100 with a conductive polymer powder material solvent and drying the solvent, the surface of the thick pure aluminum foil layer 2100 is covered with a molecular film capillary interface, resulting in a conductive composite aluminum foil with an extremely conductive interface. Then, a capacitance storage factor material is coated on the interface film, so that the capacitance storage factor material contacts the molecular capillary interface, resulting in an extremely low coating contact resistance and an extremely high discharge composite electrode. Through verification using actual products obtained in production, the method of this invention has achieved a discharge current significantly higher than that of conventional coating processes. The threshold of the discharge current varies depending on the thickness of the thick pure aluminum foil layer, thereby enabling customized design of the discharge current and safe control of charge-discharge life. In some embodiments, the capacitance storage factor material is a mixture of activated carbon and flocculant, wherein the activated carbon accounts for 95% or more of the mixture.

[0028] Experiments were conducted using a wound capacitor with a capacitance of 700F, a voltage of 2.7V, a diameter of 35mm, and a height of 70mm. Using the technical solution of this invention, when the total length of the thick pure aluminum foil layer is 1.2~1.5 meters, the axial conductivity of the 30μm thick pure aluminum foil layer is 65~110A, which can withstand short-term transient discharge of approximately 65~110A, greatly improving the charging and discharging capability.

[0029] Reference Figure 6-13As shown, a capacitor 100 according to another embodiment of the present invention includes a battery cell 200 as described in any of the preceding embodiments, an aluminum shell 1 housing the battery cell 200, and a terminal cover assembly 3 for encapsulating the battery cell 200 within the aluminum shell 1. The terminal cover assembly 3 includes a cover body 30, a bolt conductive post 31 and an explosion-proof valve 32 mounted on the cover body 30, an anchor 33, and a rubber ring 34 disposed between the anchor 33 and the cover body 30. The anchor 33 is electrically connected to the aluminum shell 1, leading out the positive or negative terminal of the capacitor. Correspondingly, the bolt conductive post is electrically connected to the negative or positive pure aluminum layer at one end of the battery cell, leading out the negative or positive terminal of the capacitor.

[0030] Reference Figures 8-13 The cover plate body 30 is in the shape of a three-tiered frustum, comprising a first frustum 301, a second frustum 302, and a third frustum 303. The first frustum 301 is located at the bottom, and its diameter is larger than that of the second frustum 302. The second frustum 302 is located in the middle, and its diameter is larger than that of the third frustum 303. The third frustum 303 is located at the top. A through hole 304 is provided at the center of the cover plate body 30, and the bolt conductive post 31 is installed within the through hole 304. An explosion-proof valve mounting hole 320 is provided through the second frustum 302 and the third frustum 303. The explosion-proof valve mounting hole 320 is parallel to the through hole 304, but they are on different planes. This arrangement improves the safety performance of the cover plate assembly. (Refer to...) Figure 11 As shown, the rubber ring 34 is mounted on the first frustum 301. In some embodiments, the width of the frustum 301 is the same as the width of the rubber ring 34. A raised ring 3010 is provided on the surface of the first frustum 301. By providing the raised ring 3010, the strength of the cover plate body can be strengthened. When the rubber ring 34 is mounted on the first frustum 301, the extrusion interference of the raised ring 3010 can make the rubber ring 34 more firmly mounted and improve the sealing performance of the rubber ring 34. If the thickness of the rubber ring 34 is too thick, a large force is required during installation, and the overall size of the cover plate must be taken into account, resulting in high production costs. If the thickness of the rubber ring 34 is too thin, the sealing performance is weak. In this embodiment of the invention, through continuous experimental testing, the thickness of the rubber ring 34 is selected as 2mm. At this thickness, the overall effect is better and the production cost is the lowest. When the cover plate assembly is encapsulated in the aluminum shell, the opening of the aluminum shell is secured to the rubber ring 34 by the rolled edge. The protruding ring 3010 on the first round platform squeezes the rubber ring 34 to generate interference, thereby firmly installing the terminal cover plate assembly 3 into the opening of the aluminum shell 1 to encapsulate the battery cell 2 inside the aluminum shell 1.

[0031] Reference Figure 6-8 , Figures 11-12As shown, the cover plate body 30 is in the shape of a three-tiered frustum. The bolt conductive post 31 is provided with an annular boss, which includes a first boss 311, a second boss 312, and a third boss 313. When the bolt conductive post 31 is installed in the through hole of the cover plate body, the first boss 311, the second boss 312, and the third boss 313 press against the inner wall of the through hole and embed into the cover plate body 30, thereby tightly and firmly installing it in the through hole 304. The bolt conductive post 31 has a threaded hole 310 in its central axial direction. The inner wall of the threaded hole 310 is provided with internal threads for connection with external studs. The threaded hole 310 is closed at one end, that is, the threaded hole 310 does not penetrate through the bolt conductive post 31. When the depth of the screw hole 310 is too large, it takes too much time to tighten the external studs. Conversely, when the screw hole 310 is too shallow, the stud connection is prone to detachment. In this technical field, there are no conventional empirical values ​​or common technical methods. This invention, through numerous experimental tests combining the structure of the cover plate body 30, the structure of the bolt conductive post 31, and the actual use of the capacitor, selected a depth for the screw hole 310 that is greater than the distance between the third protrusion 313 and the second protrusion 312, but less than the distance between the third protrusion 313 and the first protrusion 311. This setting improves the overall performance of the cover plate. In some embodiments, the bolt conductive post 31 is made of pure aluminum plated with nickel, and its cross-sectional diameter is 3-5 mm. Practical verification shows that this designed bolt conductive post 31 has a conductivity of 21A~110A and good instantaneous discharge current. In some embodiments, the bolt conductive post 31 is made of copper-aluminum composite material, with copper and aluminum materials fused together. This results in high conductivity and allows for larger instantaneous current. In some embodiments, the bolt conductive post 31 is made of pure aluminum material, and the cross-sectional diameter of the bolt conductive post 31 is 10-12.5 mm. Through practical verification, its instantaneous conductivity reaches more than 1000A.

[0032] Reference Figure 6-9 As shown, the anchor 33 includes a generally disc-shaped body 330 and pins 331 protruding from the surface of the body 330; wherein, a triangular opening 332 is provided at the center of the body 330, and the bolt conductive post 31 and the explosion-proof valve 32 on the cover plate body 30 are exposed on the surface of the terminal cover plate assembly 3 through the triangular opening 332; wherein, the projection of the bolt conductive post 31 on the triangular opening 332 coincides with the center of the triangular opening 332, and the projection of the explosion-proof valve 32 on the triangular opening 332 is located at one corner of the triangular opening 332; the present invention is designed to facilitate the installation of capacitors and to facilitate the function of the explosion-proof valve, thereby improving the safety of capacitors.

[0033] In some embodiments, the three sides of the triangular opening 332 are equal, forming an equilateral triangle; there are three pins 331, each corresponding to one of the three sides of the triangular opening 332; in some embodiments, the extension direction of the pins 331 is perpendicular to the surface of the body 330 of the anchor 33; in some embodiments, a notch 3301 is formed on the body 330 corresponding to the position of the pin, the pin 331 is T-shaped, and there is clearance space between the pin 331 and the two sides of the notch 3301; the thickness of the pin 331 is equal to the thickness of the body 330. This configuration can enhance the strength of the pins and facilitate the installation of capacitors.

[0034] Reference Figure 9 As shown, in some embodiments, the diameter of the body 330 of the anchor 33 is larger than the diameter of the cover plate body 30; in some embodiments, the diameter of the body 330 of the anchor 33 is equal to the outer diameter of the opening of the aluminum shell 1. After the opening of the aluminum shell 1 is rolled, the anchor 33 is laser welded to the edge of the rolled edge of the aluminum shell, and the bottom surface of the body of the anchor 33 abuts against the surface of the second frustum 302 of the cover plate body 30.

[0035] Reference Figure 1-8 As shown, the wound battery cell 200 is inserted into the aluminum shell 1 through the opening. The positive pure aluminum layer 211 of the positive electrode aluminum foil 21 is electrically connected to the aluminum shell 1 through a positive current collector, or the positive pure aluminum layer 211 of the positive electrode aluminum foil 21 directly abuts against the bottom end of the aluminum shell 1 and is electrically connected to the aluminum shell 1. The anchor 33 is laser-welded to the opening end of the aluminum shell 1, and the positive terminal of the capacitor is led out from the pin on the anchor 33. The negative pure aluminum layer 231 is directly electrically connected to the bolt conductive post 31, or is electrically connected to the bolt conductive post 31 through a negative current collector, and the negative terminal of the capacitor is led out from the bolt conductive post 31. It should be noted that in this invention, the positive and negative terminals of the capacitor are not fixed and can be adjusted by changing the winding of the battery cell or changing the placement of the core package inside the aluminum shell.

[0036] As another embodiment of the invention, refer to Figures 14-20The terminal cover assembly 3 includes a cover body 30, terminal conductive posts 31 and explosion-proof valves 32 mounted on the cover body 30, anchors 33, and a rubber ring 34 disposed between the anchors 33 and the cover body 30. The cover body 30 is in the shape of a three-tiered frustum, including a first frustum 301, a second frustum 302, and a third frustum 303. The first frustum 301 is located at the bottom, and its diameter is larger than that of the second frustum 302. The second frustum 302 is located in the middle, and its diameter is larger than that of the third frustum 303. The third frustum 303 is located at the top. The cover plate body 30 has a through hole 304 extending vertically through its center, and the terminal conductive post 31 is installed in the through hole 304; an explosion-proof valve mounting hole 320 is provided through the second frustum 302 or the third frustum 303, the explosion-proof valve mounting hole 320 is parallel to the through hole 304, and the two are on different planes; this arrangement improves the safety performance of the terminal cover plate assembly 3.

[0037] Reference Figure 11 As shown, the rubber ring 34 is mounted on the first frustum 301. In some embodiments, the width of the frustum 301 is the same as the width of the rubber ring 34. A raised ring 3010 is provided on the surface of the first frustum 301. By providing the raised ring 3010, the strength of the cover plate body 30 can be strengthened. When the rubber ring 34 is mounted on the first frustum 301, the extrusion interference of the raised ring 3010 makes the rubber ring 34 more firmly mounted and improves the sealing performance of the rubber ring 34. The thickness of the rubber ring 34 is 2mm. At this thickness, the overall effect is better and the production cost is the lowest. When the terminal cover plate assembly 3 is encapsulated in the aluminum shell 1, the opening of the aluminum shell 1 is secured to the rubber ring 34 by the rolled edge. The raised ring 3010 on the first frustum 301 extrudes the rubber ring 34, causing interference, thereby firmly mounting the terminal cover plate assembly 33 to the opening of the aluminum shell to encapsulate the core package inside the aluminum shell.

[0038] The terminal conductive post 31 includes a connecting end 310 and a fixing end 311. The connecting end 310 is used for external connection, and the fixing end 311 is installed in the through hole 304. The fixing end 311 includes an annular bottom 3110, an annular middle portion 3111, and a cylindrical top 3112. The connecting end 310 is cylindrical and protrudes upward from the cylindrical top 3112. The diameter of the connecting end is smaller than the diameter of the cylindrical top 3112, and the connecting end and the cylindrical top 3112 are coaxial. An annular groove 3113 is formed between the annular bottom 3110 and the annular middle portion 3111. The surfaces of the annular groove 3113 and / or the annular middle portion 3111 are knurled 3114. This arrangement allows the terminal conductive post 31 to be securely installed on the cover plate body 30 and to make tight, seamless contact with the cover plate body 30, improving the electrical performance of the terminal conductive post.

[0039] Reference Figures 18-20 As shown, in some embodiments, the diameter of the annular bottom 3010 is larger than the diameter of the annular middle portion 3111, the diameter of the annular middle portion 3111 is larger than the diameter of the cylindrical top 3112, and the diameter of the cylindrical top 3112 is equal to the inner diameter of the through hole 304 of the cover plate body 30. When the terminal conductive post 31 is installed in the through hole 304 of the cover plate body 30, the annular bottom 3010 and the annular middle portion 3011 press against the inner wall of the through hole 304 and embed into the cover plate body 30. Interference is generated by the annular groove 3113 and the knurling 3114 on the surface of the annular middle portion 3111 to firmly install the terminal conductive post 31 in the through hole 304 of the cover plate body 30. In some embodiments, the connecting end of the terminal conductive post 31 is a solid cylinder, the diameter of the connecting end 310 is smaller than the diameter of the cylindrical top 3112, and the length of the connecting end 310 is greater than the diameter of the cylindrical top 3112. It should be noted that any structure in the present invention is the result of the inventor's creative labor during the research and development process, and does not involve any empirical value or conventional design.

[0040] Reference Figure 1-3 , Figure 14-15As shown, the wound battery cell 200 is inserted into the aluminum shell 1 through the opening. The positive pure aluminum layer of the positive electrode aluminum foil layer is electrically connected to the aluminum shell through a positive current collector, or the positive pure aluminum layer of the positive electrode aluminum foil layer directly abuts against the bottom end of the aluminum shell and is electrically connected to the aluminum shell. The anchor 33 is laser-welded to the opening end of the aluminum shell, and the positive terminal of the capacitor is led out from the pin on the anchor 33. The negative pure aluminum layer is directly electrically connected to the terminal conductive post, or is electrically connected to the terminal conductive post through a negative current collector, and the negative terminal of the capacitor is led out from the terminal conductive post. It should be noted that in this invention, the positive and negative terminals of the capacitor are not fixed and can be adjusted by changing the winding of the battery cell or changing the placement of the core package inside the aluminum shell.

[0041] Another embodiment of the present invention is a method for manufacturing a supercapacitor, comprising the following steps: Step S1: Provide a battery cell, wherein the battery cell includes an inner layer of electrolytic paper, a positive electrode aluminum foil, an intermediate layer of electrolytic paper, and a negative electrode aluminum foil; the positive electrode aluminum foil includes a positive electrode base aluminum foil and a positive electrode pure aluminum layer protruding from one longitudinal edge of the positive electrode base aluminum foil; the negative electrode aluminum foil includes a negative electrode base aluminum foil and a negative electrode pure aluminum layer protruding from one longitudinal edge of the negative electrode base aluminum foil; the protrusion directions of the positive electrode pure aluminum layer and the negative electrode pure aluminum layer are opposite; the thickness of the positive electrode base aluminum foil is greater than the thickness of the positive electrode pure aluminum layer, and / or the thickness of the negative electrode base aluminum foil is greater than the thickness of the negative electrode pure aluminum layer; Step S2: Provide an aluminum shell with an opening at one end. Insert the core pack into the aluminum shell from the opening end, with the positive or negative pure aluminum layer of the core pack directly abutting the bottom end of the aluminum shell. Step S3: Provide a terminal cover assembly for encapsulating the core package within an aluminum shell and bringing out the positive and negative terminals of the capacitor.

[0042] In step S3, the terminal cover assembly includes a cover body, terminal conductive posts and explosion-proof valves mounted on the cover body, and anchors; wherein, the anchors are laser-welded to the open end of the aluminum shell, and the positive terminal of the capacitor is led out from the pins on the anchors; the negative electrode pure aluminum layer is electrically connected to the terminal conductive posts, and the negative terminal of the capacitor is led out from the terminal conductive posts.

[0043] It is understood that the above description is a further detailed explanation of the invention in conjunction with specific / preferred embodiments, and it should not be considered that the specific implementation of the invention is limited to these descriptions. For those skilled in the art, various substitutions or modifications can be made to these described embodiments without departing from the inventive concept, and all such substitutions or modifications should be considered within the scope of protection of this patent. In the description of this specification, the reference to terms such as "an embodiment," "some embodiments," "preferred embodiment," "example," "specific example," or "some examples," etc., indicates that the specific features, structures, materials, or characteristics described in connection with that embodiment or example are included in at least one embodiment or example of the invention.

[0044] In this specification, the illustrative expressions of the terms used do not necessarily refer to the same embodiments or examples. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, those skilled in the art can combine and integrate the different embodiments or examples described herein, as well as the features of different embodiments or examples, without contradiction. Although embodiments of the invention and their advantages have been described in detail, it should be understood that various changes, substitutions, and modifications can be made herein without departing from the scope defined by the appended claims.

[0045] Furthermore, the scope of this invention is not intended to be limited to the specific embodiments of the processes, machines, manufactures, compositions of matter, means, methods, and steps described in the specification. Those skilled in the art will readily understand that existing or later-developed disclosures, processes, machines, manufactures, compositions of matter, means, methods, or steps that perform substantially the same function as the corresponding embodiments described herein or obtain substantially the same results as the embodiments described herein can be utilized. Therefore, the appended claims are intended to include such processes, machines, manufactures, compositions of matter, means, methods, or steps within their scope.

Claims

1. A supercapacitor cell, characterized in that: The device comprises an inner layer of electrolytic paper, a positive electrode aluminum foil, an intermediate layer of electrolytic paper, and a negative electrode aluminum foil. The positive electrode aluminum foil includes a positive electrode base layer aluminum foil and a positive electrode pure aluminum layer extending longitudinally from one end edge of the positive electrode base layer aluminum foil. The negative electrode aluminum foil includes a negative electrode base layer aluminum foil and a negative electrode pure aluminum layer extending longitudinally from one end edge of the negative electrode base layer aluminum foil. The thickness of the positive electrode pure aluminum layer and / or the negative electrode pure aluminum layer is 30-50 μm, and the aluminum purity is 99.999% or higher. The extension directions of the positive electrode pure aluminum layer and the negative electrode pure aluminum layer are opposite. The thickness of the positive electrode base layer aluminum foil is greater than the thickness of the positive electrode pure aluminum layer, and / or the thickness of the negative electrode base layer aluminum foil is greater than the thickness of the negative electrode pure aluminum layer.

2. The supercapacitor cell as described in claim 1, characterized in that: The inner electrolytic paper, positive electrode aluminum foil, middle electrolytic paper, and negative electrode aluminum foil are wound together; wherein, one end of the battery cell is a wound multi-layer positive electrode pure aluminum layer, and the other end is a wound multi-layer negative electrode pure aluminum layer.

3. The supercapacitor cell as described in claim 2, characterized in that: The outer surface of the wound battery cell consists of a positive electrode aluminum foil layer, a ring of electrolytic paper, and a ring of negative electrode pure aluminum layer.

4. The supercapacitor cell as described in claim 2, characterized in that: One end of the battery cell leads to the positive terminal of the capacitor, and the other end leads to the negative terminal of the capacitor.

5. A capacitor, characterized in that: It includes the battery cell as claimed in any one of claims 1-4, an aluminum casing housing the battery cell, and a terminal cover assembly for encapsulating the battery cell within the aluminum casing.

6. The capacitor as described in claim 5, characterized in that: The terminal cover assembly includes a cover body, a bolted conductive post and an explosion-proof valve mounted on the cover body, an anchor, and a rubber ring disposed between the anchor and the cover body.

7. The capacitor as claimed in claim 6, characterized in that: The anchor is electrically connected to the aluminum shell, leading out either the positive or negative terminal of the capacitor.

8. The capacitor as claimed in claim 6, characterized in that: The cover plate body is in the shape of a three-tiered frustum, which includes a first frustum, a second frustum and a third frustum.

9. The capacitor as claimed in claim 8, characterized in that: The bolt conductive post is provided with an annular boss, which includes a first boss, a second boss, and a third boss.

10. The capacitor as claimed in claim 6, characterized in that: The bolt conductive post has a threaded hole in its central axis, and the inner wall of the threaded hole has an internal thread for connecting with an external stud.

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