CN104319113B - Cover plate structure for super capacitor - Google Patents

Abstract

The invention provides a cover plate structure for a super capacitor, which comprises an end cover and a metal polar plate, wherein a protruding device is arranged on one end face of the metal polar plate and close to the edge of the metal polar plate, the protruding device and the metal polar plate are integrally arranged, and the protruding device is positioned on a circular surface with the center of the metal polar plate as the circle center and the same diameter; the end cover is characterized in that an accommodating cavity is formed in the end face of the inner side of the end cover, the end face of the inner side of the accommodating cavity is opened to form an opening for the protrusion device to completely extend into, the diameter of the opening of the accommodating cavity is matched with that of the protrusion device of the metal polar plate, and the metal polar plate is completely located in the accommodating cavity of the end cover through the protrusion device and is tightly connected with the end cover. The metal pole plate is more reliably connected with the end cover of the cover plate structure, and is not easy to separate or loosen.

Description

Cover plate structure for supercapacitor

technical field

The invention relates to a supercapacitor, in particular to a cover plate structure for a supercapacitor.

Background technique

Supercapacitor is a new type of energy storage device between traditional capacitors and rechargeable batteries. Due to its advantages of high power, fast charge and discharge rate, long cycle life and environmental protection, it has been widely used in industrial electronics, transportation, etc. in recent years. Transportation, renewable energy and other fields have been more and more widely used as power sources or energy storage sources.

Commonly used large-capacity supercapacitors, such as 3000F supercapacitors, due to their large capacity and high current charge and discharge rate, if the structure is not designed properly, the capacitor is prone to leakage or the positive and negative terminals are burned. Therefore, the common Large-capacity supercapacitors generally include a metal case with one end open and the other end closed. The closed end of the metal case extends outward to form a metal pole. A supercapacitor is formed by sealing the open end of the metal case with a cover plate with a metal pole on the outer end surface.

In order to make the structure of large-capacity supercapacitors more reliable, the traditional cover structure used to seal the metal case of supercapacitors usually includes a sealing cover for sealing and a polar plate connected to the core. A metal pole is arranged at the center of the outer end surface of the sealing cover; the pole plate is electrically connected to the sealing cover, and then the metal pole located on the sealing cover is used as an electrode of the supercapacitor. The traditional way of connecting the sealing cover and the polar plate is to connect the polar plate and the sealing cover together by clamping; although the connection method of the cover plate in this structural form is relatively simple, the polar plate and the sealing cover are Snap connection; during use, when the supercapacitor is subjected to strong vibration, the plate and the sealing cover are easily separated, which will cause the internal resistance of the supercapacitor to increase, or cause the function of the supercapacitor to fail.

In order to solve the technical defects of the above-mentioned supercapacitor, a cover plate structure for a supercapacitor is disclosed in the patent document of Chinese Patent No. ZL201210053176.4. A sleeve matching the pole is arranged on the top. When the pole plate is connected to the sealing cover, the pole is inserted into the sleeve and the pole plate is connected to the sealing cover by laser welding or riveting. Although the cover plate structure of this structure has a certain improvement compared with the traditional cover plate structure, it is found in the process of use that due to the limited contact area between the pole and the sleeve, laser welding or riveting is used between the pole and the metal sleeve. When connecting, if there is a quality problem of welding or riveting, the pole and the metal sleeve are still easy to fall off and loosen, which will lead to an increase in the internal resistance of the supercapacitor. In addition, although the improved sealing ring structure solves the liquid leakage problem of the product to a certain extent, the assembly operation is more troublesome; and due to the structure of the plate, the connection area between the core and the plate is too small, and after a period of use , the position where the core and the plate are connected will become loose, which will lead to an increase in the impedance of the supercapacitor, resulting in failure of the supercapacitor product. Therefore, based on the above technical defects, it is necessary to improve the structure of the traditional supercapacitor cover plate.

Contents of the invention

The technical problem to be solved by the present invention is to provide a cover plate structure for a supercapacitor, the connection between the metal plate of the cover plate structure for the supercapacitor and the end cover of the cover plate structure is more reliable, and it is not easy to detach or loosen.

In order to solve the above-mentioned technical problems, the present invention provides a cover plate structure for a supercapacitor, which includes an end cover made of a metal material and a metal plate connected to the end cover, and on one end surface of the metal plate And a protruding device is provided near the edge of the metal pole plate, the protruding device is integrally provided with the metal pole plate, and the protruding device is located on a circular surface with the same diameter centered on the center of the metal pole plate; An accommodating cavity is provided inside the end cap, and the inner end surface of the accommodating cavity is opened to form an opening for the protruding device to fully extend into. The diameter of the device is suitable, and the metal pole plate is tightly connected with the end cover through the protrusion device being completely located in the accommodating cavity of the end cover.

In one embodiment, the protruding means is a ring-shaped bulge extending around a position close to the edge of the metal pole plate.

In one embodiment, the protruding means is a plurality of protruding pillars or arc-shaped pieces arranged at intervals with the metal pole plate as the center.

In one embodiment, the end cap includes a circular base and a circular boss with a diameter smaller than that of the circular base and protruding from the outer end surface of the circular base, at the center of the circular boss Protruding outwards forms a metal pole.

In one embodiment, the supercapacitor cover plate structure further includes a sealing ring made of insulating material, the sealing ring includes an annular ring body with a hole in the middle, and the hole diameter of the annular ring body is the same as that of the end The diameter of the circular boss of the cover is suitable; a first circular insulating edge protrudes outward along the inner edge of the annular ring body, and protrudes toward the inner side along the outer edge of the annular ring body And a second circular insulating edge is formed, the height of the first circular insulating edge is greater than the height of the second circular insulating edge, and the height of the first insulating edge matches the height of the circular boss. The height of the two circular insulating sides is adapted to the thickness of the circular base of the end cap.

In one embodiment, the cavity wall at the opening of the accommodating cavity is arranged close to the edge of the circular base, and has a diameter smaller than that of the circular base.

In one embodiment, the protruding device of the metal pole plate is an interference fit with the accommodating cavity of the end cap.

In one embodiment, the protruding device of the metal pole plate is connected to the end cap by laser welding or riveting.

In one embodiment, the diameter of the metal pole plate is smaller than the diameter of the circular base of the end cap and greater than the diameter of the cavity of the end cap, and a central hole is arranged in the center of the metal pole plate, and the A plurality of long and narrow grooves are opened on the plate surface of the metal pole plate inside the protrusion device along the radial direction of the metal pole plate with the central hole of the metal pole plate as the center.

Compared with the prior art, the present invention has the following beneficial effects: (1) Since the metal pole plate of the present invention is provided with a protruding device, and the protruding device is a ring-shaped flange extending around the edge of the metal pole plate , or a plurality of protruding pillars or arc-shaped pieces set at intervals around the metal pole plate and close to the edge of the metal pole plate, and an accommodation cavity is provided inside the end cover, when the metal pole plate is connected to the end cover, the The protruding device fully extends into the accommodating cavity and is in close contact with the accommodating cavity; since the protruding device is connected with the accommodating cavity, the contact area is relatively large, no matter through interference fit or laser welding or riveting to make it When connected, it is easy to operate, and there are many contact points, which improves the reliability of the connection, thereby ensuring that when the core of the super capacitor is connected to the metal plate, the core of the super capacitor and the terminal will not be damaged when it encounters strong vibration. The connection of the cover will not cause loosening or detachment, which improves the quality of the supercapacitor. (2) Since the plate surface of the metal pole plate of the present invention is provided with a central hole and a long and narrow groove, when the core of the supercapacitor is connected with the metal pole plate, the central hole and a plurality of long and narrow grooves ensure a more reliable metal pole of the core. Plates are connected, thereby improving the reliability of the connection between the metal plate and the core of the supercapacitor; (3) because the sealing ring of the present invention includes an annular ring body with a middle opening, a first circular insulating edge and a second circular insulating side, and the first circular insulating side insulates the circular boss of the end cap from the housing of the super capacitor, and the second circular insulating side insulates the circular base of the end cap from the housing of the super capacitor phase insulation and seal the end cap at the same time, because the height of the first circular insulating edge is greater than the height of the second circular insulating edge, when the supercapacitor casing is sealed under the action of external force, the second circular insulating edge will not Wrinkles are generated, thereby improving the sealing performance of the supercapacitor, and avoiding the phenomenon of liquid leakage caused by the supercapacitor due to poor sealing.

Description of drawings

Fig. 1 is the three-dimensional exploded structural representation of supercapacitor cover plate structure of the present invention, shows the three-dimensional exploded structure of supercapacitor cover plate structure of the present invention among the figure;

Fig. 2 is a schematic cross-sectional structural view of the cover plate structure for a supercapacitor of the present invention, which shows the relative positional relationship of each component of the cover plate structure for a supercapacitor of the present invention.

Fig. 3 a is the three-dimensional structure schematic diagram of a viewing angle of the end cap of supercapacitor cover plate structure of the present invention;

Fig. 3 b is the three-dimensional structure schematic diagram of another angle of view of the end cap of the supercapacitor cover plate structure of the present invention;

Fig. 4 a is the schematic diagram of the front view of the end cap of the supercapacitor cover plate structure of the present invention;

Fig. 4 b is the top view structure schematic diagram of the end cover of supercapacitor cover plate structure of the present invention;

Fig. 4c is a schematic cross-sectional structure diagram of the A-A direction of Fig. 4b of the present invention;

Fig. 5 a is the three-dimensional structure schematic diagram of a viewing angle of the metal pole plate of supercapacitor cover plate structure of the present invention;

Fig. 5 b is the three-dimensional structure schematic diagram of another angle of view of the metal pole plate of supercapacitor cover plate structure of the present invention;

Fig. 6 a is the schematic diagram of the front view of the metal pole plate of the cover plate structure of the supercapacitor of the present invention;

Fig. 6b is a schematic cross-sectional structure diagram of the B-B direction of Fig. 6a of the present invention;

Fig. 7 a is the three-dimensional structure schematic diagram of a viewing angle of the sealing ring of the supercapacitor cover plate structure of the present invention;

Fig. 7b is a three-dimensional structural schematic diagram of another viewing angle of the sealing ring of the supercapacitor cover plate structure of the present invention;

Fig. 8 a is the top view structure schematic diagram of the sealing ring of the supercapacitor cover plate structure of the present invention;

Fig. 8b is a schematic cross-sectional structure diagram taken along line C-C of Fig. 8a of the supercapacitor cover plate structure of the present invention.

detailed description

The supercapacitor cover plate structure of the present invention, in addition to having the effect of sealing the open end of the supercapacitor casing, when it seals the open end of the supercapacitor casing, the supercapacitor cover plate structure and the supercapacitor The cores inside the casing are connected to serve as an electrode of the supercapacitor. Because the supercapacitor cover plate structure has functions as an electrode of the supercapacitor and sealing the supercapacitor casing, the present invention mainly revolves around how to improve the cover plate structure to make it more firmly connected to the supercapacitor core. From the perspective of the lowest internal resistance and how to improve the structure of the cover to make the sealing performance better, the relevant technical content of the present invention is described.

Referring to Fig. 1 and Fig. 2, the supercapacitor cover plate structure of the present invention comprises end cover 1, metal pole plate 2 and sealing ring 3; Wherein, end cover 1 adopts metal material to make, and one end surface of metal pole plate 2 is positioned at end The inner end face of the cover 1 is connected with the end cover 1, and the other end face is used for connecting with the core of the supercapacitor. The sealing ring 3 is sleeved on the end cover 1 and cooperates with the end cover 1 to seal the supercapacitor casing. open end.

3a and 3b, the end cap 1 of the present invention includes a circular base 11 and a circular boss 12, wherein the circular boss 12 protrudes from the outer end surface of the circular base 11, and The diameter of the circular boss 12 is smaller than the diameter of the circular base 11; a metal pole 121 protrudes outward along the central position of the circular boss 12, and the metal pole 121 is used as a supercapacitor electrode.

Referring to Fig. 4a, Fig. 4b and Fig. 4c, the end cap 1 of the present invention is provided with an accommodating cavity 13 inside, and the inner end surface of the accommodating cavity 13 is opened to form an opening for the metal pole plate 2 to extend into, and the metal pole plate 2 It is connected to the end cap 1 by protruding into the opening. The cavity wall 131 at the opening of the accommodating cavity 13 is disposed close to the edge of the circular base 11 , and its diameter is slightly smaller than that of the circular base 1 .

5a and 5b, the metal pole plate 2 of the present invention includes a plate body 21 and a protruding device 22; wherein, the protruding device 22 is located on the end face inside the plate body 21, and is close to the edge of the plate body 21 and connected to the plate body 21 one set.

Referring to FIG. 6 a and FIG. 6 b , a central hole 211 and a plurality of elongated slots 212 are provided on the board surface of the board body 21 of the present invention; wherein, the central hole 211 is located at the center of the board body 21 . The long and narrow grooves 212 are opened along the radial direction of the plate body 21 and are arranged radially around the central hole 211. The plurality of long and narrow grooves 212 are all located inside the protruding device 22 and surrounded by the protruding device 22 . When the metal pole plate 2 is connected to the supercapacitor core, the pole piece of the capacitor core is connected in the long and narrow groove 212, and the long and narrow groove 212 is radially arranged along the radial direction of the plate body 21, ensuring that the core and the metal pole plate 2 are connected more firmly.

Referring to Fig. 5a and Fig. 5b again, the protrusion device 22 of the present invention is located on one end surface of the metal pole plate 2, and is close to the edge of the plate body 21, and is located in a circle with the same diameter as the center of the plate body 21. On the surface, that is to say, the raised device 22 is equidistant from the center of the plate body 21 .

Referring again to Fig. 2 and Fig. 4c, the diameter of the protruding device 22 of the present invention is adapted to the diameter of the opening of the accommodating cavity 13 of the end cap 1, and the protruding device 22 can fully extend into the accommodating cavity 13 and closely connected with the end cap 1. As shown in the figure, the protruding device 22 of the present invention is preferably an annular flange 221 extending close to the edge of the metal pole plate 2; The edge 211 is completely located in the accommodation cavity 13 and the accommodation cavity is in close contact. In order to make the connection between the end cover 1 and the metal plate 2 more firm, the connection between the annular flange 221 and the accommodation cavity 13 is preferably an interference fit. , and then reinforce the connection between the ring-shaped flange 221 and the accommodating cavity 13 by laser welding or riveting; it is obvious that the ring can also be made by using interference fit alone, or by laser welding or riveting. The shaped flange 211 is connected with the accommodating cavity 13 .

As an alternative form of the ring-shaped flange 221, the protruding device 22 of the present invention can also be a plurality of protruding posts or arc-shaped pieces arranged at intervals with the metal plate as the center, and the plurality of protruding posts arranged at intervals Or the arc-shaped sheet is also located on a circular surface with the same diameter taking the center of the plate body 21 as the center of the circle, so that the technical effect played by the ring-shaped convex edge 221 can also be achieved.

When the protruding device 22 in the above structure is connected to the accommodating cavity 13, the contact area is relatively large, the contact connection points are many, and the connection reliability is high. Under the circumstances, since the connection between the metal pole plate 2 and the end cap 1 will not be loosened or disengaged, it is ensured that the core of the super capacitor will not be loosened or disengaged due to vibration.

Referring to Fig. 7a and Fig. 7b, sealing ring 3 of the present invention is made of insulating material, and it comprises the annular ring body 31 of opening in the middle, and the hole diameter of described annular ring body 31 is the same as the circular protrusion of end cap 1 of the present invention. The diameter of the platform 12 is adapted, and the outer diameter of the annular ring body 31 is adapted to the diameter of the circular base 11 of the end cap.

Referring to Fig. 8a, Fig. 8b and Fig. 2 at the same time, the sealing ring 3 of the present invention also includes a first circular insulating edge 32 and a second circular insulating edge 33, wherein the first circular insulating edge 32 is along the annular body The inner edge of 31 protrudes toward the outer end surface of the annular ring body 31 ; and the second circular insulating edge 33 is formed along the outer edge of the annular ring body 31 and protrudes toward the inner end surface of the annular ring body 31 . The height of the first circular insulating edge 32 is greater than the height of the second circular insulating edge 33, and the height of the first insulating edge 32 is adapted to the height of the circular boss 12 of the end cap. The height of the two circular insulating sides 33 is adapted to the thickness of the circular base 11 of the end cover 1 .

When the sealing ring 3 of the present invention is sleeved on the end cover 1, the first circular insulating edge 32 can insulate the circular boss 12 of the end cover 1 from the shell of the supercapacitor, and the second circular insulating edge 33 can insulate the circular base 11 of the end cap 1 from the shell of the supercapacitor, and the second circular insulating edge 33 can be used for the supercapacitor because it is located between the end cap 1 and the shell of the supercapacitor. To achieve a good sealing effect, and because the height of the second circular insulating edge 33 is small, when the supercapacitor is sealed under the action of an external force, its edge will not produce wrinkles, thereby improving the sealing performance of the supercapacitor and avoiding the supercapacitor. Capacitor leakage due to poor sealing.

Claims (7)

1. A cover plate structure for a supercapacitor, comprising an end cap made of metal material and a metal pole plate connected to the end cap, characterized in that, on an end face of the metal pole plate and close to the metal pole plate There is a protruding device at the edge, the protruding device is integrated with the metal pole plate, and the protruding device is located on a circular surface of the same diameter with the center of the metal pole plate as the center; An accommodating cavity, the inner end surface of the accommodating cavity is opened to form an opening for the protruding device to fully extend into, and the diameter of the opening of the accommodating cavity is suitable for the diameter of the protruding device of the metal plate Matching, the metal pole plate is closely connected with the end cover through the protrusion device being completely located in the accommodating cavity of the end cover; The end cap includes a circular base and a circular boss with a diameter smaller than the circular base and protruding from the outer end surface of the circular base, protruding outward at the center of the circular boss A metal pole is formed; The supercapacitor cover plate structure also includes a sealing ring made of insulating material, the sealing ring includes an annular ring body with a hole in the middle, and the hole diameter of the annular ring body is the same as the circular boss of the end cap. The diameter of the annular ring body is adapted to the size; a first circular insulating edge is formed protruding outward along the inner edge of the annular ring body, and a second circle is formed protruding inward along the outer edge of the annular ring body shaped insulating edge, the height of the first circular insulating edge is greater than the height of the second circular insulating edge, and the height of the first insulating edge matches the height of the circular boss of the end cap, and the height of the second circular insulating edge The height of the circular insulating edge is adapted to the thickness of the circular base of the end cap. 2 . The cover plate structure for a supercapacitor according to claim 1 , wherein the protrusion means is a ring-shaped rim extending around the edge of the metal plate. 3 . 3 . The cover plate structure for a supercapacitor according to claim 1 , wherein the protruding means is a plurality of protruding columns or arc-shaped pieces arranged at intervals with the metal pole plate as the center. 4 . 4. The cover plate structure for a supercapacitor according to claim 1, wherein the cavity wall at the opening of the accommodating cavity is arranged near the edge of the circular base, and has a diameter smaller than the diameter of the circular base. 5 . The cover plate structure for a supercapacitor according to claim 4 , wherein the protruding device of the metal plate is an interference fit with the accommodating cavity of the end cap. 6 . 6 . The cover plate structure for a supercapacitor according to claim 5 , wherein the protruding device of the metal pole plate is connected to the end cover by laser welding or riveting. 7 . 7. the cover plate structure for supercapacitor as claimed in claim 6, is characterized in that, the diameter of described metal pole plate is less than the circular base diameter of described end cap and is greater than the cavity diameter of described end cap, in The center of the metal pole plate is provided with a central hole, and the surface of the metal pole plate inside the protrusion device is centered on the central hole of the metal pole plate and is provided with a plurality of long and narrow grooves along the radial direction of the metal pole plate.