KR20130034459A - Electric double layer capacitor - Google Patents

Abstract

PURPOSE: An electric double layer capacitor is provided to form a leakage prevention protrusion and a leakage prevention groove in the inner bottom of a main case and the bottom of a gasket, and to prevent the electrolyte in the main case from leaking out to the outside. CONSTITUTION: A first polarity electrode(500) is adhered to the inner part of a main case(100). An upper cap(200) seals the opened upper part of the main case. A second polarity electrode(400) corresponding to the first polarity electrode is adhered to the inner part of the upper cap. A gasket(300) is arranged between the upper cap and the main case to seal the upper cap and the main case. A leakage prevention protrusion(330) is formed in the central bottom part of the gasket. A leakage prevention groove(130) is formed in the inner bottom of the main body corresponding to the leakage prevention protrusion. A separator(600) is formed between the first polarity electrode and the second polarity electrode.

Description

Electric Double Layer Capacitors {ELECTRIC DOUBLE LAYER CAPACITOR}

The present invention relates to an electric double layer capacitor, and more particularly, the leakage preventing protrusions and the leakage preventing grooves are formed along the circumference of the bottom surface of the gasket and the inner case of the main body case to prevent the electrolyte from flowing inside the capacitor. An electrical double layer capacitor is provided to prevent it.

In general, electric double layer capacitors, such as coin type, have a high energy density, have better charge and discharge cycles than lithium secondary batteries, and have friendly characteristics. have.

The conventional electric double layer capacitor (EDLC) is an energy storage device using a pair of charge layers (electric double layers) having different signs, which is capable of continuous charging / discharging, Compared with the energy efficiency, the output is high, and the durability and stability are excellent.

In general, the electric double layer capacitor has a cell formed by disposing an anode and a cathode opposite to each other with a separator interposed therebetween, and then impregnating an electrolyte.

1 is a coupling cross-sectional view showing an electric double layer capacitor according to the prior art.

Referring to FIG. 1, the electric double layer capacitor according to the related art uses a polarizable electrode 30 and 40 that is sufficiently impregnated with an electrolytic solution using a conductive adhesive to an upper cap 10 and a lower can 20, which are exterior materials. After attaching to each other, a separator 50 is interposed between the two polarizable electrodes 30 and 40, and then the upper cap 10 and the lower can 20 are assembled. The gasket 60 is packed between the lower cans 20 for insulation and sealing.

At this time, an outer circumferential upper end portion in which the lower can 20 and the gasket 60 are in close contact with each other is formed with a blade 22 that is a portion bent inward to the upper end of the lower can 20 by a curling process. .

Therefore, the electric double layer capacitor is an electrolyte solution from the polarizable electrode 40 provided inside the lower can 20 at a portion where the lower can 20 and the gasket 60 are in close contact with each other due to internal pressure expansion after a curling process. It is important to prevent it from leaking outside.

On the other hand, the electric double layer capacitor according to the prior art as described above is usually used to be attached to a printed circuit board with a memory element, and is used by soldering by a reflow process which is a method of surface mounting on the printed circuit board. .

In the reflow method, a solder cream or the like is applied to a portion to be soldered on a printed board in advance, a component is supplied to the portion, and lead is supplied to the solder portion, while the solder portion is higher than the melting point of the lead (for example, 200 It is a method of soldering parts on a printed board by dissolving lead while passing in a high temperature atmosphere set to be 240 ° C and 270 ° C in the case of Pb-free.

In order to solder an electric double layer capacitor onto a substrate by such a reflow method, the material of the electric double layer capacitor also requires high heat resistance.

However, in the conventional electric double layer capacitor, due to overheating such as an internal pressure expansion after curling processing and soldering on a printed board and overheating, the electrolytic solution impregnated from the polarizable electrodes 30 and 40 provided inside the structure can be lowered. There was a problem that a phenomenon that the outflow from the close contact portion of the 20 and the gasket 60 occurs.

That is, the conventional electric double layer capacitor is in close contact with the gasket 60 in a structure in which the lower circumferential portion of the upper cap 10 is bent in structure, and in such a close contact portion of the upper cap 10 and the gasket 60 in such a structure. The electrolyte has a difficult structure, but on the contrary, in the close contact portion of the gasket 60 and the lower can 20, the electrolyte has a relatively easy structure, and accordingly, the gasket 60 and the lower can 20 are separated. There is a problem that the phenomenon in which the electrolyte flows out from the close contact portion of the).

In addition, there is a problem that the durability of the capacitor is lowered from the phenomenon that the electrolyte is leaked to the outside, which significantly shortened the service life of the capacitor.

Therefore, there is a need for development of a structure of an electric double layer capacitor capable of preventing an external leak of the electrolyte and increasing the service life by increasing durability.

KR 10-2007-0084816 A 2007.08.27.

In order to solve the above problems, the present invention is formed along the circumference of the bottom surface of the gasket and the inner bottom surface of the main body case to prevent the outflow projection and the outflow prevention grooves to prevent the electrolyte from flowing inside the main body case to the outside It is an object of the present invention to provide an electric double layer capacitor.

Another object of the technology according to the present invention is to form a plurality of the leakage preventing projections and the leakage preventing grooves corresponding to each other along the circumference of the bottom surface of the gasket and the inner case of the main body case and at the same time to form a taper on the leakage preventing projections inside the body case This is to more stably prevent the leakage of the electrolyte to the outside.

In addition, the technology according to the present invention forms a plurality of leakage preventing projections and leakage preventing grooves corresponding to each other along the circumference of the bottom surface of the gasket and the inner bottom of the main body case and at the same time to form a main body case by forming a spill prevention projection in a tapered shape. By stably preventing the leakage of the electrolyte inside to increase the durability of the electric double layer capacitor to extend the service life of the electric double layer capacitor.

The present invention for achieving the above-mentioned objects is as follows. That is, the electric double layer capacitor according to the present invention has a main body case to which a first polarizable electrode impregnated with an electrolyte is attached to an inner surface thereof, and a second polarizable electrode corresponding to the first polarizable electrode is attached to an inner surface of the main body case. An upper cap for sealing an open top of the gasket, a gasket disposed between the upper cap and the main body case to insulate and seal the upper cap and the main body case, and between the first polarizing electrode and the second polarizing electrode. An electric double layer capacitor including an interposed separator, the bottom surface of the gasket to prevent the electrolyte from flowing out from the first polarizable electrode inside the body case through the close contact portion of the body case and the gasket. Corresponding along the periphery of the central part and the inner bottom surface of the main body case, the leakage preventing protrusion and the leakage preventing groove are optional. .

Here, the leak prevention protrusions are formed along the center portion of the bottom surface of the gasket, and are formed in plural at regular intervals, and the leak prevention grooves extend along the inner bottom surface of the main body case in correspondence with the leak prevention protrusions. On the other hand, it is preferably formed in plural pieces with a predetermined interval.

At this time, the leakage preventing protrusion and the leakage preventing groove is preferably formed in a tapered trapezoidal shape to be engaged with each other.

In addition, the leakage preventing protrusion and the leakage preventing groove may correspond to each other along the circumference of the side center portion of the gasket and the inner side surface of the main body case, and may be further protruded and recessed selectively.

Referring to the effect of the electric double layer capacitor according to the present invention.

First, an electrical double layer capacitor is provided along the bottom surface of the gasket and the inner bottom surface of the main body case to prevent the outflow protrusion and the leakage preventing groove from flowing out to the outside of the main body case. For the purpose of

Second, along the periphery of the bottom surface of the gasket and the inner bottom surface of the main body case, a plurality of mutually corresponding leak preventing projections and outflow preventing grooves are formed, and at the same time, taper is formed on the leak preventing projections so that the electrolyte solution inside the main body case flows outward. Can be prevented more stably.

Third, along the periphery of the bottom surface of the gasket and the inner bottom surface of the main body case, a plurality of mutually corresponding leak preventing projections and outflow preventing grooves are formed, and at the same time, the leakage preventing projections are formed in a tapered shape to allow the electrolyte solution inside the main body case to go outside. By stably preventing leakage, the service life of the electric double layer capacitor can be extended by increasing the durability of the electric double layer capacitor.

1 is a combined cross-sectional view showing an electric double layer capacitor according to the prior art.
Figure 2 is a coupling cross-sectional view showing an electric double layer capacitor according to a first embodiment of the present invention.
Figure 3 is an exploded perspective view showing an electric double layer capacitor according to a first embodiment of the present invention.
Figure 4 is a coupling cross-sectional view showing an electric double layer capacitor according to a second embodiment of the present invention.
5 is a cross-sectional view showing a coupling structure showing an electric double layer capacitor according to a third embodiment of the present invention.
Figure 6 is a coupling cross-sectional view showing an electric double layer capacitor according to a fourth embodiment of the present invention.
7 is a cross-sectional view illustrating a combined electric double layer capacitor according to a fifth embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the electric double layer capacitor according to the present invention.

2 is a cross-sectional view showing a combined electric double layer capacitor according to a first embodiment of the present invention, Figure 3 is a separate perspective view showing an electric double layer capacitor according to a first embodiment of the present invention.

4 is a coupling cross-sectional view showing an electric double layer capacitor according to a second embodiment of the present invention, Figure 5 is a coupling cross-sectional view showing an electric double layer capacitor according to a third embodiment of the present invention, Figure 6 8 is a cross-sectional view illustrating an electric double layer capacitor according to a fourth embodiment of the present invention, and FIG. 7 is a cross-sectional view illustrating an electric double layer capacitor according to a fifth embodiment of the present invention.

First, referring to FIGS. 2 to 3, the electric double layer capacitor according to the first embodiment of the present invention includes a main body case 100 to which the first polarizable electrode 500 impregnated with an electrolyte is attached to an inner surface thereof, and the first The second polarizable electrode 400 corresponding to the polarized electrode 500 is attached to the inner surface to seal the open upper portion of the main body case 100, the upper cap 200 and the main body. A gasket 300 disposed between the case 100 to insulate and seal the upper cap 200 and the body case 100, and the first polarizable electrode 500 and the second polarized electrode 400. It is comprised including the separator 600 interposed between.

In this case, the gasket 300 may be prevented from leaking to the outside from the first polarizable electrode 500 inside the body case 100 through the close contact portion between the body case 100 and the gasket 300. It is preferable that the leakage preventing protrusion 330 extends along the center of the bottom surface.

In addition, it is preferable that the leakage preventing groove 130 is formed along the inner bottom surface of the main body case 100 in correspondence with the leakage preventing protrusion 330.

Further, although not shown, the leakage preventing protrusion 330 and the leakage preventing groove 130 correspond to each other along the lateral center portion of the gasket 300 and the inner side circumference of the main body case 100, and further protrude and dent. It may be formed.

As described above, since the leakage preventing protrusion 330 and the leakage preventing groove 130 are formed, the electric double layer capacitor according to the present invention is an electrolyte solution from the first polarizable electrode 500 provided in the inner space of the main body case 100. It is possible to reliably prevent the leakage to the outside.

Meanwhile, referring to FIG. 4, the electric double layer capacitor according to the second embodiment of the present invention includes a main body case 100a to which the first polarizable electrode 500 is impregnated with an electrolyte, and the first polarity is attached. The second polarizable electrode 400 corresponding to the electrode 500 is attached to the inner surface to seal the open upper part of the main body case 100a, the upper cap 200 and the main body case ( A gasket 300a disposed between the upper cap 200 and the body case 100a and between the first polarizable electrode 500 and the second polarized electrode 400. It is comprised including the separator 600 interposed.

Here, the body case 100 may be prevented from leaking to the outside from the first polarizable electrode 500 inside the body case 100a through the close contact portion between the body case 100a and the gasket 300a. It is preferable that the leakage preventing protrusion 130a extends along the inner bottom edge of the inner surface 100a.

In this case, it is preferable that the leakage preventing groove 330a is formed along the center portion of the bottom surface of the gasket 300a in correspondence with the leakage preventing protrusion 130a. Accordingly, the leakage preventing protrusion 130a and the leakage preventing groove 330a are formed. The interlocking and close contact with each other may stably prevent the electrolyte from flowing out from the first polarizable electrode 500 provided in the body space 100a.

Further, although not shown, the leakage preventing protrusion 130a and the leakage preventing groove 330a correspond to each other along the inner bottom edge of the main body case 100a and the center portion of the bottom surface of the gasket 300a to protrude further. And depressions.

Meanwhile, referring to FIG. 5, the electric double layer capacitor according to the third exemplary embodiment of the present invention includes a main body case 100b to which the first polarizable electrode 500 impregnated with an electrolyte is attached to an inner surface thereof, and the first polarizable property. The second polarizable electrode 400 corresponding to the electrode 500 is attached to the inner surface to seal the open upper portion of the main body case 100b, the upper cap 200 and the main body case ( A gasket 300b disposed between the upper cap 200 and the main body case 100b and between the first polarizing electrode 500 and the second polarizing electrode 400. It is comprised including the separator 600 interposed.

Here, the gasket 300b may be prevented from leaking to the outside from the first polarizable electrode 500 inside the main body case 100b through the close contact portion between the main body case 100b and the gasket 300b. The leakage preventing protrusion 330b extends along the center of the bottom of the bottom surface, and the leakage preventing protrusion 330b is preferably formed in plural with a predetermined interval.

At this time, it is preferable that a plurality of leak prevention grooves 130b are formed along the inner bottom surface of the main body case 100b to correspond to the leak prevention protrusion 330b.

Further, although not shown, the leakage preventing protrusion 330b and the leakage preventing groove 130b correspond to each other along the circumference of the side center portion of the gasket 300b and the inner side surface of the main body case 100b, respectively, and additionally have a single or predetermined interval. Alternatively, more protruded and recessed may be formed from among a plurality.

Since the above-described leakage preventing protrusion 330b and the leakage preventing groove 130b are formed in plural, the electric double layer capacitor according to the present invention can significantly increase the closeness of the adhesion between the main body case 100b and the gasket 300b. As a result, the electrolyte may be more stably prevented from flowing out from the first polarizable electrode 500 provided in the inner space of the main body case 100b.

Meanwhile, referring to FIG. 6, the electric double layer capacitor according to the fourth exemplary embodiment of the present invention includes a main body case 100c to which the first polarizable electrode 500 impregnated with an electrolyte is attached to an inner surface thereof, and the first polarizable property. The second polarizable electrode 400 corresponding to the electrode 500 is attached to the inner surface to seal the open upper part of the main body case 100c, the upper cap 200 and the main body case ( A gasket 300c disposed between the upper cap 200 and the main body case 100c and between the first polarizing electrode 500 and the second polarizing electrode 400. It is comprised including the separator 600 interposed.

Here, the gasket 300c may be prevented from leaking to the outside from the first polarizable electrode 500 inside the body case 100c through the close contact portion between the body case 100c and the gasket 300c. Outflow prevention projections (330c) is formed to extend along the bottom surface center portion of the), while the outflow prevention projections (330c) are formed in a plurality with a predetermined interval, it is preferably formed in a tapered shape of the light beam down.

At this time, it is preferable that a plurality of spill preventing grooves 130c are formed along the inner bottom surface of the main body case 100c to correspond to the spill preventing protrusion 330c, but are formed in a tapered shape of a light beam bottom.

In addition, although not shown, the leakage preventing protrusion 330c and the leakage preventing groove 130c correspond to each other along the circumference of the side center portion of the gasket 300c and the inner side surface of the main body case 100c, and further have a predetermined interval. A plurality may be further protruded and recessed.

The above-described leakage preventing protrusion 330c and the leakage preventing groove 130c are formed in a tapered shape in plural, so that the electric double layer capacitor according to the present invention has closeness to the close contact between the main body case 100c and the gasket 300c. It can be remarkably increased, whereby the electrolyte solution can be more stably prevented from flowing out from the first polarizable electrode 500 provided in the inner space of the main body case 100c.

Meanwhile, referring to FIG. 7, the electric double layer capacitor according to the fifth embodiment of the present invention includes a main body case 100d to which the first polarizable electrode 500 is impregnated with an electrolyte, and the first polarity is attached. The second polarizable electrode 400 corresponding to the electrode 500 is attached to the inner surface to seal the open upper portion of the main body case 100d, the upper cap 200 and the main body case ( A gasket 300d disposed between the upper cap 200 and the main body case 100d and between the first polarizable electrode 500 and the second polarized electrode 400. It is comprised including the separator 600 interposed.

Here, the gasket 300d may be prevented from leaking to the outside from the first polarizable electrode 500 inside the main body case 100d through the close contact portion between the main body case 100d and the gasket 300d. Outflow prevention projections (330d) is formed extending along the bottom surface center portion of the), in particular, the leakage prevention projections (330d) is formed in a plurality with a predetermined interval is preferably formed in a tapered shape of the light beam down.

At this time, it is preferable that a plurality of leakage preventing grooves 130d are formed along the inner bottom surface of the main body case 100d in correspondence with the leakage preventing protrusions 330d, but are formed in a tapered shape of a light beam bottom.

In addition, the leakage preventing protrusion 330d and the leakage preventing groove 130d as shown in FIG. 7 correspond to each other along the circumference of the side center portion of the gasket 300d and the inner side surface of the main body case 100d, and are additionally constant. It may be formed further protruding and recessed into a plurality of spaced apart.

As described above, the leakage preventing protrusions 330d and the leakage preventing grooves 130d are formed in plural, and are provided in a tapered shape of the upper and lower narrowings. The tightness of the adhesion portion 300d) may be significantly increased, and thus, the electrolyte may be more stably prevented from flowing out from the first polarizable electrode 500 provided in the inner space of the main body case 100b. It becomes possible.

In addition, by stably preventing the electrolyte from flowing inside the main body case 100d, the durability of the electric double layer capacitor can be increased, and the service life of the electric double layer capacitor can be extended.

On the other hand, the electric double layer capacitor according to the first to fifth embodiments of the present invention as described above is formed in various shapes, such as mountain shape, hemispherical shape, such as upward or downward, so that the leakage preventing protrusion and the leakage preventing groove correspond to each other. Can be.

Furthermore, when a plurality of spill prevention protrusions and spill prevention grooves are provided, the shapes of the spaced apart portions may be formed in various shapes such as a mountain shape and a hemispherical shape.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, the invention is not limited thereto. Various modifications may be made by those skilled in the art. Are included in the scope of the present invention.

100, 100a, 100b, 100c, 100d: main body case
130, 330a, 130b, 130c, 130d: spill prevention groove
200: upper cap
300, 300a, 300b, 300c, 300d: gasket
330, 130a, 330b, 330c, 330d: spill prevention protrusion
400: second polarizable electrode
500: first polarizable electrode
600: separator

Claims (4)

A main case to which the first polarizable electrode impregnated with an electrolyte is attached to the inner surface, and an upper cap to which the second polarizable electrode corresponding to the first polarizable electrode is attached to the inner surface to seal an open upper portion of the main body case; An electrical double layer capacitor including a gasket disposed between the upper cap and the main body case to insulate and seal the upper cap and the main body case, and a separator interposed between the first polarizing electrode and the second polarizing electrode. To
Corresponding along the center of the bottom surface of the gasket and the circumference of the inner bottom of the main body case to prevent the electrolyte from flowing out from the first polarizable electrode inside the main body case through the close contact portion of the main body case and the gasket. The double-layer capacitor, characterized in that the leakage preventing projection and the leakage preventing groove is selectively formed. The method of claim 1,
The leakage preventing protrusions are formed along the central portion of the bottom surface of the gasket, and are formed in plural at regular intervals, and the leakage preventing grooves are formed along the inner bottom surface of the main body case in correspondence with the leakage preventing protrusions. On the other hand, the electric double layer capacitor, characterized in that formed in a plurality with a predetermined interval. The method of claim 2,
The leakage preventing protrusion and the leakage preventing groove is formed in a tapered trapezoidal shape to correspond to each other, the electric double layer capacitor, characterized in that. 4. The method according to any one of claims 1 to 3,
And the leakage preventing protrusion and the leakage preventing groove correspond to each other along the circumference of the side center portion of the gasket and the inner side surface of the main body case, and are further protruded and recessed.

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