Fully-sealed supercapacitor and manufacturing method thereof

Abstract

The invention discloses a fully-sealed super capacitor and a manufacturing method thereof. The fully-sealed super capacitor comprises a positive terminal, a negative electrode outer cover assembly, a battery cell and a negative terminal, the manufacturing method comprises the following steps: performing automatic laser welding and split assembly to obtain a full-sealed supercapacitor monomer, performing vacuum drying, injecting an electrolyte, and performing standing infiltration, formation, aging and capacity grading operation in sequence to obtain the full-sealed supercapacitor. By means of split stamping manufacturing and welding composite connection, full-automatic operation in the assembling process is achieved, the product uniformity is effectively improved, the production efficiency is improved, and the manufacturing cost is reduced; the integrated cathode outer cover assembly is adopted to form a full-sealed structure, so that the insulation sealing effect, the high temperature resistance and the service life are effectively improved, and the problem of liquid leakage in the use process of the capacitor is effectively solved; the current collecting bar and the current collecting piece are removed, the welding frequency is effectively reduced, the welding difficulty is lowered, and the problem that the ohmic internal resistance is increased due to multiple welding is effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of electrochemical energy storage components, and in particular to a fully sealed supercapacitor and a manufacturing method thereof. Background Art

[0002] Supercapacitor is an electrochemical energy storage device between traditional capacitors and batteries. It consists of electrodes, electrolytes, diaphragms and current collectors, and relies on the double-layer principle and Faraday pseudocapacitance principle to store charge. It has the advantages of high power density, fast charging speed, long cycle life, and wide operating temperature range. It is widely used in new energy vehicles, rail transportation, aerospace, industrial automation and other fields.

[0003] At present, in order to achieve its large current discharge capability, large-capacity capacitors generally adopt a full-ear laser end face welding plus axial lead-out structural design, one end (positive or negative) of which is connected to the outer shell, and the other end is insulated and sealed from the outer shell by a rubber sealing ring, and a sealing machine waist sealing packaging form is adopted. However, the rubber ring has poor high temperature resistance and life, and is easily deformed during assembly, and there is a problem of leakage; and the ceramic sealing structural design adopted can achieve full sealing welding, but brazing operation is required between the metal parts and the inner and outer rings of the ceramic ring. Before this step, the surface needs to be metallized in advance so that the solder can penetrate, and the surface uniformity of the metallized inner and outer rings of the ceramic ring is poor; and during the high-temperature brazing process, due to the different expansion coefficients of the metal parts and the ceramic ring, the diameter of the ceramic ring is limited and cannot be too large (the outer diameter is usually not more than 30mm). When it exceeds a certain size, it is very easy to break and fail due to stress problems during the high-temperature brazing process, which leads to scrapping, resulting in low yield and high production costs. Summary of the invention

[0004] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a fully sealed supercapacitor and a manufacturing method thereof.

[0006] In order to achieve the above-mentioned object, in a first aspect, the present invention provides a fully sealed supercapacitor, comprising: a positive terminal, a negative electrode outer cover assembly, a battery cell and a negative electrode terminal, wherein two ends of the battery cell are respectively welded to the positive terminal and the negative terminal, the negative electrode outer cover assembly passes through the negative terminal and is welded to the shell, the positive terminal is welded to the shell, and the negative terminal is welded to the negative electrode outer cover assembly;

[0007] The negative electrode outer cover assembly comprises a welding metal ring and a negative electrode cover plate connected by riveting and deformation, a sealing elastic member is sleeved on the outer side of the welding metal ring, and an insulating structural member is sleeved on the inner side of the negative electrode cover plate.

[0008] In some embodiments, the positive terminal and the negative terminal are stamped separately, the bottom end face of the positive terminal is welded to the positive end face of the battery cell, and the top end face of the negative terminal is welded to the negative end face of the battery cell.

[0009] In some embodiments, the negative electrode cover plate is symmetrically provided with an injection hole and a mounting groove, the injection hole is inserted with a sealing nail, the sealing nail is welded to the negative electrode cover plate, the mounting groove is installed with an explosion-proof plate, the explosion-proof plate is welded to the negative electrode cover plate, and a protective plate is attached to the outside of the explosion-proof plate.

[0010] In some embodiments, the negative electrode cover is made of aluminum or stainless steel, the positive terminal and the shell are made of aluminum or aluminum alloy, the negative terminal is made of aluminum, nickel-plated copper, or half copper and half aluminum, the explosion-proof plate is made of aluminum or stainless steel, and the protective plate is made of plastic.

[0011] In some embodiments, the welding metal ring sleeved with the sealing elastic member passes through the negative electrode cover plate sleeved with the insulating structural member to form a riveting gap, and the welding metal ring and the negative electrode cover plate are fixedly connected by a riveting process.

[0012] In some embodiments, the welding metal ring is made of aluminum or nickel-plated copper, the sealing elastic member is made of fluororubber, and the insulating structural member is made of polypropylene or polyphenylene sulfide.

[0013] In some of the embodiments, a battery cell separator is wound around the middle of the battery cell, and termination tapes are wound around both ends of the battery cell separator.

[0014] In some embodiments, the positive terminal, the negative outer cover assembly and the negative terminal are externally welded to a shell, an inner contour edge of one end of the shell is welded to an outer contour edge of the negative outer cover assembly, and an inner contour edge of the other end of the shell is welded to an outer contour edge of the positive terminal.

[0015] In a second aspect, the present invention further provides a method for manufacturing a fully sealed supercapacitor as described in any one of the above items, the manufacturing method comprising:

[0016] S100, through automatic laser welding, the positive terminal, negative cover assembly, battery cell and negative terminal are assembled separately to obtain a fully sealed supercapacitor monomer;

[0017] S200, vacuum drying of fully sealed supercapacitor monomers;

[0018] S300, injecting electrolyte into the vacuum dried fully sealed super capacitor monomer and sequentially performing static infiltration, formation, aging and capacity division operations to obtain a fully sealed super capacitor.

[0019] In some embodiments, the S100 includes:

[0020] S101, welding the positive terminal to the battery cell, welding the negative terminal to the battery cell, and placing the positive terminal, negative terminal and battery cell into a housing;

[0021] S102, sleeve a sealing elastic member on the outside of the welding metal ring, sleeve an insulating structural member on the outside of the negative electrode cover plate, pass the welding metal ring sleeved with the sealing elastic member through the negative electrode cover plate sleeved with the insulating structural member to form a riveting gap, and deform the welding metal ring through a riveting process to form a negative electrode outer cover assembly;

[0022] S103, welding the negative electrode outer cover assembly through the negative electrode terminal and the outer shell, welding the positive electrode terminal and the outer shell, and welding the negative electrode terminal and the negative electrode outer cover assembly.

[0023] The present invention has the following beneficial effects:

[0024] 1. The present invention retains the overall dimensions and positive and negative terminal structures of existing supercapacitors. Through split stamping and welding composite connection, the entire assembly process adopts laser welding technology, which realizes full automation of the assembly process, effectively improves product uniformity, improves production efficiency, and reduces production costs.

[0025] 2. In the present invention, a welding metal ring with a sealing elastic member is passed through a negative electrode cover plate with an insulating structural member to form a riveting gap, and the welding metal ring is deformed by a riveting process to form a negative electrode outer cover assembly. An integrated negative electrode outer cover assembly is used to form a fully sealed structure, which effectively improves the insulating sealing effect, high temperature resistance and service life, and the sealing elastic member will not be deformed, effectively solving the problem of leakage during the use of the capacitor;

[0026] 3. In the present invention, the positive terminal and the negative terminal are directly connected to the two ends of the battery cell by laser welding, and the collector and the busbar are removed. After the components are streamlined, the welding frequency and the welding difficulty can be effectively reduced, which effectively solves the problem of increased ohmic internal resistance caused by multiple welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A cross-sectional schematic diagram of a fully sealed supercapacitor proposed in the present invention;

[0028] Figure 2 for Figure 1 Schematic diagram of the structure of the positive and negative electrode outer cover assembly;

[0029] Figure 3 for Figure 1 A schematic cross-sectional view of the positive and negative electrode outer cover components;

[0030] Figure 4 for Figure 3 The enlarged schematic diagram of point Ⅰ in the middle;

[0031] Figure 5 for Figure 3 The enlarged schematic diagram of the middle II;

[0032] Figure 6 for Figure 1 Schematic diagram of the structure of the positive terminal;

[0033] Figure 7 for Figure 1 Schematic diagram of the structure of the negative terminal;

[0034] Figure 8 for Figure 1 Schematic diagram of the structure of the battery cell;

[0035] Fig. 9 The process of manufacturing the fully sealed supercapacitor proposed by the present invention Figure 1 ;

[0036] Fig.10 The process of manufacturing the fully sealed supercapacitor proposed by the present invention Figure 2 .

[0037] Legend:

[0038] 1. Positive terminal; 2. Negative outer cover assembly; 21. Negative cover plate; 211. Liquid injection hole; 212. Mounting groove; 213. Explosion-proof plate; 214. Protective plate; 22. Welding metal ring; 23. Insulating structural member; 24. Sealing elastic member; 3. Battery cell; 31. Positive terminal; 32. Negative terminal; 33. Battery cell diaphragm; 34. Termination tape; 4. Negative terminal; 5. Housing. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] The embodiment of the present application provides a fully sealed supercapacitor and a manufacturing method thereof, which solves the problems of poor high temperature resistance and lifespan of the sealing method using rubber sealing rings in the prior art, and easy deformation during assembly, and leakage; and the surface uniformity of the ceramic sealing structure design is poor, and the stress problem during high temperature brazing leads to low yield rate and high production cost. However, the present application realizes the full automation of the assembly process through the method of split stamping and welding composite connection, effectively improves product uniformity, improves production efficiency, and reduces production costs; adopts an integrated negative electrode outer cover assembly to form a fully sealed structure, effectively improves the insulation sealing effect, high temperature resistance and service life, and the sealing elastic parts will not deform, effectively solving the problem of leakage during the use of the capacitor; removes the collector and busbar, effectively reduces the welding frequency, and effectively solves the problem of increased ohmic internal resistance due to multiple welding.

[0041] Please refer to the following examples for details:

[0042] Reference Figure 1-Figure 8 The present invention provides an embodiment of a fully sealed supercapacitor, the specific structure of which includes: a positive terminal 1, a negative electrode outer cover assembly 2, a battery cell 3 and a negative terminal 4.

[0043] Among them, the integrated negative electrode outer cover assembly 2 is composed of a welding metal ring 22 and a negative electrode cover plate 21 which are deformed and connected by a riveting process, and a sealing elastic member 24 is sleeved on the outer side of the welding metal ring 22, and an insulating structural member 23 is correspondingly sleeved on the inner side of the negative electrode cover plate 21, so that the negative electrode cover plate 21 and the welding metal ring 22 can be separated and connected into one by a riveting process; in addition, the two ends of the battery cell 3 are directly connected to the positive terminal 1 and the negative terminal 4 by laser welding and then placed in a shell 5 of standardized design size, and the integrated negative electrode outer cover assembly 2 passes through the negative terminal 4 and is connected to the shell 5 by laser welding, and then the positive terminal 1 is connected to the shell 5 by laser welding, and finally the negative terminal 4 and the negative electrode outer cover assembly 2 are connected by laser welding to complete full sealing.

[0044] It is understandable that the fully sealed supercapacitor designed in this application retains the general product dimensions and positive and negative terminal 4 structures of existing supercapacitors as a whole, and can be seamlessly connected to existing equipment and systems, greatly reducing the cost of product replacement and upgrade;

[0045] In addition, the manufacturing process of the terminal is optimized through the split stamping and welding composite connection method: split stamping enables each component to achieve the optimal utilization of materials and the optimal design of the structure while meeting functional requirements, without the need for fine processing, which can effectively reduce the production volume of materials and thus reduce production costs; and the entire assembly process uses laser welding technology, which can ensure the structural sealing integrity of the battery cell 3 while achieving efficient charge transfer between the battery cell 3 and the positive terminal 1 and the negative terminal 4, and realizes fully automated operation of the assembly process, effectively improving product uniformity and thus improving production efficiency.

[0046] Please continue reading Figure 1-Figure 8 In one embodiment, the positive terminal 1 and the negative terminal 4 are both manufactured by separate stamping.

[0047] It should be explained in detail that the busbar is removed from the positive terminal 1, and the current collector is removed from the negative terminal 4, and the positive and negative poles are directly connected to the battery cell 3 by laser welding, and the corresponding pole terminals are directly connected to the negative pole cover 2 / housing 5 by laser welding. The streamlined components can effectively reduce the welding frequency and difficulty, thereby solving the problem of increased ohmic internal resistance caused by multiple welding, so that the manufactured fully sealed supercapacitor has higher charging and discharging efficiency, longer service life, and better safety and reliability.

[0048] Specifically, the positive terminal 1 and the housing 5 are made of aluminum or aluminum alloy, the negative terminal 4 is made of aluminum, copper-plated nickel or half copper and half aluminum, the negative cover 21 is made of aluminum or stainless steel, and the welding metal ring 22 is made of aluminum or copper-plated nickel. It can be understood that aluminum has good electrical conductivity and heat dissipation; copper-plated nickel combines the high electrical conductivity of copper and the corrosion resistance of nickel, and the half-copper and half-aluminum design combines the advantages of the two, which not only ensures electrical conductivity but also reduces production costs.

[0049] Furthermore, in one embodiment, the negative electrode cover plate 21 is symmetrically provided with an injection hole 211 and a mounting groove 212; wherein the injection hole 211 is used to inject electrolyte during the production process; in addition, in order to prevent leakage of electrolyte and entry of external impurities, a sealing nail is inserted into the injection hole 211 of the negative electrode cover plate 21 after the injection is completed, and the sealing nail is inserted into the injection hole 211 and connected to the negative electrode cover plate 21 by laser welding, so as to seal the injection hole 211 after the electrolyte injection is completed;

[0050] Correspondingly, an explosion-proof piece 213 is installed on the installation groove 212 of the negative electrode cover plate 21 for relieving pressure when the internal pressure of the supercapacitor is relatively high, and the explosion-proof piece 213 is welded to the negative electrode cover plate 21 .

[0051] Generally, during the use of supercapacitors, once gas accumulates inside and causes excessive internal pressure, it is easy to explode, which poses a safety hazard to the supercapacitor.

[0052] In this embodiment, installing an explosion-proof plate 213 on the negative electrode cover plate 21 effectively solves this problem: when the internal pressure inside the capacitor reaches the preset pressure value of the explosion-proof plate 213, the explosion-proof plate 213 will rupture, and the internal gas will be discharged in time to avoid the occurrence of explosion, thereby greatly reducing the danger during the use of the supercapacitor, ensuring the safety of the use of the supercapacitor, and significantly improving the reliability of the product. Specifically, the material of the explosion-proof plate 213 is aluminum or stainless steel, which has a certain strength and toughness and can automatically rupture when the preset pressure is reached; at the same time, in order to prevent the explosion-proof plate 213 from being scratched by external sharp objects during normal use, a protective plate 214 made of plastic material is also attached to the outside of the explosion-proof plate 213.

[0053] It should be explained in detail that in the above-mentioned fully sealed supercapacitor, the insulating structural member 23 is sleeved on the inner side of the negative electrode cover plate 21, and the sealing elastic member 24 is sleeved on the outer side of the welding metal ring 22. During production and processing, the welding metal ring 22 sleeved with the sealing elastic member 24 will pass through the negative electrode cover plate 21 sleeved with the insulating structural member 23, thereby forming a gap that can be riveted, and then it will be placed on the processing station of the riveting machine. The welding metal ring 22 is deformed by the riveting process and connected with the negative electrode cover plate 21 to form an integrated negative electrode outer cover assembly 2, and the sealing elastic member 24 and the insulating structural member 23 can be abutted together after riveting to form an annular sealing structure, which can completely separate the welding metal ring 22 and the negative electrode cover plate 21 from each other; and the integrated negative electrode outer cover assembly 2 formed by the riveting process and other components together form a fully sealed structure, which can effectively improve the insulating sealing effect, high temperature resistance and service life, and the sealing elastic member 24 will not be deformed, thereby effectively solving the problem of leakage that is very easy to occur during the use of the capacitor.

[0054] Specifically, the sealing elastic part 24 is made of fluororubber, which has excellent high temperature resistance, chemical corrosion resistance and aging resistance, and can maintain stable performance for a long time in a complex working environment; and the insulating structural part 23 is made of polypropylene (PP) or polyphenylene sulfide (PPS), which has good insulation and mechanical properties, and can further enhance the insulation sealing effect.

[0055] It can be understood that during the entire design and manufacturing process of the supercapacitor, the positive terminal 1 and the negative terminal 4 are formed by separate stamping and then connected by laser and battery cell 3 welding; this combination of separate stamping and laser welding realizes full automation of the assembly process, effectively improves product uniformity, improves production efficiency, and reduces manufacturing costs; at the same time, the welding metal ring 22 with a sealing elastic member 24 is passed through the negative electrode cover plate 21 with an insulating structural member 23 to form a riveting gap, and the welding metal ring 22 is deformed through the riveting process to form a negative electrode outer cover assembly 2, and an integrated negative electrode outer cover assembly 2 is used to form a fully sealed structure, which effectively improves the insulation sealing effect, high temperature resistance and service life of the supercapacitor, so that the sealing elastic member 24 will not be deformed during long-term use, thereby effectively solving the problem of leakage during the use of the capacitor, and can meet the high-quality reliability requirements of industrial fields such as new energy vehicles / aerospace, and has a wide range of applications.

[0056] Please continue reading Figure 1-Figure 8 In one embodiment, the bottom end face of the positive terminal 1 and the end face of the positive terminal 31 of the battery cell 3 are connected by laser welding; correspondingly, the bottom end face of the negative terminal 4 and the end face of the negative terminal 32 of the battery cell 3 are connected by laser welding.

[0057] Specifically, the middle part of the battery cell 3 is wrapped with a battery cell separator 33, which can separate the positive / negative poles of the battery to prevent the two poles from contacting and short-circuiting, and avoid safety accidents such as overheating, fire or even explosion of the battery; and the two ends of the battery cell separator 33 are wrapped with termination tape 34, which is based on insulating materials such as polypropylene, polyester or polyimide, coated with electrolyte-resistant acrylic glue, and has good electrical insulation.

[0058] Further, in one embodiment, the positive terminal 1, the negative electrode outer cover assembly 2, the negative electrode terminal 4 and the battery cell 3 are externally welded with a shell 5 of standardized design size. Specifically, the inner contour edge of one end of the shell 5 is connected to the outer contour edge of the negative electrode cover plate 21 in the negative electrode outer cover assembly 2 by laser welding, and the inner contour edge of the other end of the shell 5 is welded to the outer contour edge of the positive terminal 1.

[0059] Reference Figure 9-10 The present invention also provides an embodiment of a method for manufacturing the fully sealed supercapacitor of the above embodiment, the manufacturing method comprising:

[0060] S100, by automatic laser welding, the positive terminal 1, the negative electrode outer cover assembly 2, the battery cell 3 and the negative terminal 4 are assembled separately to obtain a fully sealed supercapacitor monomer.

[0061] Exemplarily, S100 includes:

[0062] S101, welding the positive terminal 1 to the battery cell 3, welding the negative terminal 4 to the battery cell 3, and installing the positive terminal 1, the negative terminal 4 and the battery cell 3 into the housing 5;

[0063] S102, sleeve a sealing elastic member 24 on the outside of the welding metal ring 22, sleeve an insulating structural member 23 on the outside of the negative electrode cover plate 21, pass the welding metal ring 22 sleeved with the sealing elastic member 24 through the negative electrode cover plate 21 sleeved with the insulating structural member 23 to form a riveting gap, and deform the welding metal ring 22 through a riveting process to form a negative electrode outer cover assembly 2;

[0064] S103 , the negative electrode outer cover assembly 2 is welded to the outer shell 5 through the negative electrode terminal 4 , the positive electrode terminal 1 is welded to the outer shell 5 , and the negative electrode terminal 4 is welded to the negative electrode outer cover assembly 2 .

[0065] It can be understood that when manufacturing a fully sealed supercapacitor, first, the positive terminal 1 is connected to the battery cell 3 by laser welding, and then the negative terminal 4 is connected to the battery cell 3 by laser welding, and then the connected positive terminal 1, negative terminal 4 and battery cell 3 are placed together in the housing 5; secondly, a sealing elastic member 24 is sleeved on the outside of the welding metal ring 22, and then an insulating structural member 23 is sleeved on the outside of the negative electrode cover plate 21, and then the welding metal ring 22 sleeved with the sealing elastic member 24 is passed through the negative electrode cover plate 21 sleeved with the insulating structural member 23 to form a riveting gap, and then the welding metal ring 22 is deformed by a riveting process. , the negative electrode cover plate 21, the welding metal ring 22, the insulating structural member 23 and the sealing elastic member 24 are connected together to form an integrated negative electrode outer cover assembly 2, and the sealing elastic member 24 and the insulating structural member 23 can be abutted together to form an annular sealing structure after riveting, and the welding metal ring 22 and the negative electrode cover plate 21 are completely separated from each other; finally, the negative electrode outer cover assembly 2 is passed through the negative terminal 4 and connected to the outer shell 5 by laser welding, and then the positive terminal 1 is connected to the outer shell 5 by laser welding, and then the negative terminal 4 is connected to the negative electrode outer cover assembly 2 by laser welding, and finally a fully sealed supercapacitor monomer is obtained.

[0066] S200, vacuum drying of the fully sealed supercapacitor monomer.

[0067] Exemplarily, the welded fully sealed supercapacitor cell is placed in a tunnel vacuum oven for drying and dehydration.

[0068] S300, injecting electrolyte into the vacuum dried fully sealed super capacitor monomer and sequentially performing static infiltration, formation, aging and capacity division operations to obtain a fully sealed super capacitor.

[0069] Exemplarily, the supercapacitor monomer after vacuum drying and dehydration is placed on the liquid injection machine, and the liquid injection machine performs vacuum liquid injection operation under vacuum environment through the liquid injection hole 211 of the supercapacitor monomer; after injecting a predetermined amount of electrolyte, the sealing nail is inserted into the liquid injection hole 211 and the sealing nail is welded to the negative electrode cover plate 21 to obtain a fully sealed supercapacitor;

[0070] Next, after the sealing pin welding is completed, the supercapacitor is left to stand for a period of time. During the standing process, the electrolyte will fully infiltrate the electrodes and diaphragms inside the capacitor, which helps the electrolyte to fully contact the electrode material, making the ion transmission between the electrode and the electrolyte smoother, thereby improving the performance and consistency of the supercapacitor; in the formation process, constant current charging, constant voltage charging and other methods are usually used to charge the capacitor according to certain voltage, current and time parameters, and then discharge it. This process can activate the activity of the electrode material, improve the interface performance between the electrode and the electrolyte, and improve the performance indicators such as the charging and discharging efficiency, cycle life and stability of the supercapacitor; the aging process is to place the supercapacitor under certain temperature, voltage and other conditions for a period of time to allow various physical and chemical processes inside it to fully proceed in order to stabilize its performance; the capacity classification process is to test and sort the capacity of the aged supercapacitor, and measure the amount of charge that can be stored and released under certain conditions by charging and discharging the supercapacitor to determine its actual capacity, and classify the supercapacitor according to different capacity ranges according to the capacity test results, so as to meet the requirements of capacitor capacity in different application scenarios;

[0071] Finally, in order to facilitate product traceability and management, fully sealed supercapacitors will be laser coded. Laser coding can clearly and permanently mark relevant product information (such as model, production date, production batch, etc.) on the surface of the capacitor; after coding, the product will enter the automatic testing machine, which will accurately test the two key performance indicators of the product, capacity and internal resistance. The capacity reflects the ability of the supercapacitor to store charge, while the internal resistance directly affects its charging and discharging efficiency and performance stability. Through accurate testing of these two indicators, the quality and performance of the product can be comprehensively evaluated; after the test is completed, the equipment will automatically scan the code and sort the products according to pre-set standards, and send products that meet different quality grades to the corresponding warehouses for storage, completing the test and packaging of fully sealed supercapacitors.

[0072] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A fully sealed supercapacitor, characterized in that: include: A positive terminal (1), a negative electrode outer cover assembly (2), a battery cell (3) and a negative electrode terminal (4), wherein two ends of the battery cell (3) are respectively connected to the positive electrode terminal (1) and the negative electrode terminal (4), the negative electrode outer cover assembly (2) passes through the negative electrode terminal (4) and is connected to the outer shell (5) by welding, the positive terminal (1) is connected to the outer shell (5) by welding, and the negative terminal (4) is connected to the negative electrode outer cover assembly (2) by welding; The negative electrode outer cover assembly (2) comprises a welding metal ring (22) and a negative electrode cover plate (21) connected by riveting and deformation, a sealing elastic member (24) is sleeved on the outer side of the welding metal ring (22), and an insulating structural member (23) is sleeved on the inner side of the negative electrode cover plate (21).

2. The fully sealed supercapacitor according to claim 1, characterized in that: The positive terminal (1) and the negative terminal (4) are separately stamped and formed; the bottom end face of the positive terminal (1) is welded to the end face of the positive terminal (31) of the battery cell (3); and the top end face of the negative terminal (4) is welded to the end face of the negative terminal (32) of the battery cell (3).

3. The fully sealed supercapacitor according to claim 1, characterized in that: The negative electrode cover plate (21) is symmetrically provided with a liquid injection hole (211) and a mounting groove (212); a sealing nail is inserted into the liquid injection hole (211), and the sealing nail is welded to the negative electrode cover plate (21); an explosion-proof plate (213) is installed in the mounting groove (212), and the explosion-proof plate (213) is welded to the negative electrode cover plate (21); and a protective plate (214) is attached to the outside of the explosion-proof plate (213).

4. The fully sealed supercapacitor according to claim 3, characterized in that: The negative electrode cover plate (21) is made of aluminum or stainless steel, the positive electrode terminal (1) and the housing (5) are made of aluminum or aluminum alloy, the negative electrode terminal (4) is made of aluminum, nickel-plated copper, or half copper and half aluminum, the explosion-proof plate (213) is made of aluminum or stainless steel, and the protection plate (214) is made of plastic.

5. The fully sealed supercapacitor according to claim 1, characterized in that: The welding metal ring (22) sleeved with the sealing elastic member (24) passes through the negative electrode cover plate (21) sleeved with the insulating structural member (23) to form a riveting gap, and the welding metal ring (22) and the negative electrode cover plate (21) are fixedly connected by a riveting process.

6. The fully sealed supercapacitor according to claim 5, characterized in that: The welding metal ring (22) is made of aluminum or nickel-plated copper, the sealing elastic component (24) is made of fluororubber, and the insulating structural component (23) is made of polypropylene or polyphenylene sulfide.

7. The fully sealed supercapacitor according to claim 1, characterized in that: The middle part of the battery cell (3) is wrapped with a battery cell diaphragm (33), and both ends of the diaphragm of the battery cell (3) are wrapped with a termination tape (34).

8. The fully sealed supercapacitor according to claim 1, characterized in that: The positive terminal (1), the negative electrode outer cover assembly (2) and the negative electrode terminal (4) are externally welded to a shell (5); the inner contour edge of one end of the shell (5) is welded to the outer contour edge of the negative electrode outer cover assembly (2); and the inner contour edge of the other end of the shell (5) is welded to the outer contour edge of the positive terminal (1).

9. A method for manufacturing a fully sealed supercapacitor according to any one of claims 1 to 8, characterized in that: The manufacturing method comprises: S100, by automatic laser welding, the positive terminal (1), the negative electrode outer cover assembly (2), the battery cell (3) and the negative electrode terminal (4) are assembled separately to obtain a fully sealed supercapacitor monomer; S200, vacuum drying of fully sealed supercapacitor monomers; S300, injecting electrolyte into the vacuum dried fully sealed super capacitor monomer and sequentially performing static infiltration, formation, aging and capacity division operations to obtain a fully sealed super capacitor.

10. The method for manufacturing a fully sealed supercapacitor according to claim 9, characterized in that: The S100 includes: S101, welding the positive terminal (1) to the battery cell (3), welding the negative terminal (4) to the battery cell (3), and placing the positive terminal (1), the negative terminal (4) and the battery cell (3) into a housing (5); S102, sleeve a sealing elastic member (24) on the outside of the welding metal ring (22), sleeve an insulating structural member (23) on the outside of the negative electrode cover plate (21), pass the welding metal ring (22) sleeved with the sealing elastic member (24) through the negative electrode cover plate (21) sleeved with the insulating structural member (23) to form a riveting gap, and deform the welding metal ring (22) through a riveting process to form a negative electrode outer cover assembly (2); S103, the negative electrode outer cover assembly (2) is passed through the negative electrode terminal (4) and welded to the outer shell (5), the positive electrode terminal (1) is welded to the outer shell (5), and the negative electrode terminal (4) is welded to the negative electrode outer cover assembly (2).

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