KR101558417B1 - Super capacitor - Google Patents

Abstract

An ultra-high capacity capacitor according to the present invention includes: a storage assembly in which a plurality of unit modules are stacked; a case in which the storage assembly is disposed; an upper plate sealably mounted on an upper surface of the case; And a reinforcing plate disposed on the inner surface of the upper plate and the lower plate to reinforce the strength of the upper plate and the lower plate to prevent the upper plate and the lower plate from being bent by the down force of the storage assembly laminated inside the case And can prevent leakage of the electrolytic solution.

Description

SUPER CAPACITOR

The present invention relates to an ultra-high capacity capacitor in which a plurality of unit modules are stacked to form a capacitor assembly. More particularly, the present invention relates to an ultra-high capacity capacitor which is capable of uniformly maintaining a thickness between unit modules and preventing warpage of the upper plate and the lower plate Lt; / RTI > capacitors.

In general, supercapacitors use electrostatic characteristics, so that the number of charge and discharge cycles is almost infinite as compared with a battery using an electrochemical reaction, and it can be used semi-permanently, and the charging / discharging speed of energy is very fast, It is more than a dozen times.

Due to the characteristics of such ultra-high-capacity capacitors, which can not be realized with conventional batteries, the application field is gradually expanding throughout the industry.

Especially in the field of next-generation environmentally-friendly vehicle development such as Electric Vehicle (EV), Hybrid Electric Vehicle (HEV) or Fuel Cell Vehicle (FCV), its utility as an energy buffer is increasing day by day have.

That is, the supercapacitor is used as an auxiliary energy storage device, so that the supercapacitor and the energy supply of the vehicle are charged by the battery, and the improvement of the efficiency of the overall vehicle system and the energy And extension of the life of the storage system.

In addition, it can be used as an auxiliary power source in portable electronic parts such as a mobile phone and a motion picture recorder, and its importance and usage are greatly increasing.

Such a supercapacitor can be broadly classified into an electric double layer capacitor (EDLC) and a hybrid super capacitor using an electrochemical oxidation-reduction reaction.

The electric double layer capacitor has a structure in which an electric double layer is generated on the surface to accumulate electric charges while the hybrid supercapacitor is capable of accumulating relatively more energy by accumulating electric charges by the oxidation-reduction reaction together with the electric double layer formed on the surface of the electrode material There are advantages.

Since the super capacitor uses electrostatic characteristics, it can be used semi-permanently and the charge / discharge cycle is almost infinite as compared with the battery using the electrochemical reaction, and the charging / discharging speed of the energy is very fast, to be.

A power storage module of a conventional capacitor is disclosed in Korean Patent Laid-Open Publication No. 10-2013-0016610 (Feb. 18, 2013), and includes a storage accumulation body in which a plurality of unit super high capacity capacitors and current collectors are alternately stacked, A pair of end plates which are located on the outermost side of the assembly and fix the storage assembly, a connection beam fixed to one of the pair of end plates and passing through the storage assembly and the pair of end plates, And a bolt for fixing a connecting beam passing through the accumulation aggregate which reaches the remaining corresponding end plate through a fixed end plate on which a connecting beam is fixed, ) And a negative electrode (-) are disposed. A pair of gaskets for preventing electrolyte leakage and electrical short-circuiting are formed on the side perpendicular to the separator It is sex.

However, when a plurality of unit power storage modules are stacked between a pair of end plates in the conventional power storage module, since the pressures applied to the unit storage modules located on the lower side and the unit storage modules located on the upper side are different from each other, There is a problem that a thickness variation is generated for each lamination position and the performance is deteriorated.

Further, in the conventional power storage module, since a pair of end plates are formed in the shape of a flat plate, there is a problem that warp occurs when the reduction rate is large.

In addition, in the conventional power storage module, there is a problem that electrolyte leakage occurs between the end plate and the outer wall because a pair of end plates are formed in a flat plate shape.

Korean Patent Publication No. 10-2013-0016610 (February 18, 2013)

Accordingly, it is an object of the present invention to reduce the thickness deviation of the unit modules according to the stacking position by the pressing force when the unit modules are stacked by providing the reinforcing members between the unit modules, and to reduce the misalignment between the unit modules High-capacity capacitor.

It is another object of the present invention to provide an ultra-high capacity capacitor which can improve the structure of the upper plate and the lower plate, prevent a phenomenon of warping due to the down force of the storage assembly laminated inside the case, and prevent leakage of the electrolyte.

Still another object of the present invention is to provide an ultra-high capacity capacitor having a reinforcing plate on the inner surface of the upper plate and the lower plate to reinforce the strength.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. .

In order to achieve the above object, an ultra-high-capacity capacitor of the present invention comprises a capacitor assembly in which a plurality of unit modules are stacked, a case in which the capacitor assembly is disposed, an upper plate sealably mounted on an upper surface of the case, And a reinforcing plate disposed on an inner surface of the upper plate and the lower plate to reinforce the strength of the lower plate.

The upper plate and the lower plate of the present invention may include a lid portion covering the upper and lower surfaces of the case and a protrusion integrally formed with the lid portion and inserted into the inner surface of the case.

In the case of the present invention, a plurality of first fastening holes are formed in the circumferential direction, a plurality of second fastening holes are formed in the peripheral edge of the upper plate, and a plurality of third fastening holes are formed in the peripheral edge of the lower plate. And the first fastening hole, the second fastening hole, and the third fastening hole may be fastened by one bolt.

The unit module of the present invention includes a current collector, a first active material layer laminated on one surface of the current collector, a second active material layer laminated on the other surface of the current collector, a first separator layer laminated on the first active material layer, And a second separator laminated on the second active material layer.

A reinforcing member is formed between the current collectors of the unit module. The reinforcing member is formed in a ring shape so that its outer surface contacts the inner wall surface of the case, And the bottom surface can be supported on the whole body.

As described above, in the super-capacity capacitor according to the present invention, when a unitary module is stacked by providing a reinforcing member between unit modules, it is possible to reduce the thickness deviation of the unit modules according to their stacking positions due to the depression force, Alignment deviation can be reduced.

Also, the super-capacity capacitor according to the present invention includes a top plate and a protrusion inserted into the case at the bottom of the bottom plate, and a reinforcing plate provided on the inner surface of the top plate and the bottom plate, It is possible to prevent the phenomenon of warping caused by the force of the force and to prevent leakage of the electrolytic solution.

In addition, since the unit modules are stacked in the case, the super-high capacity capacitor according to the present invention can prevent electrolyte from leaking to the side and reinforce the strength.

1 is an exploded perspective view of an ultra-high capacity capacitor according to an embodiment of the present invention.
2 is a cross-sectional view of an ultra-high capacity capacitor according to an embodiment of the present invention.
3 is a cross-sectional view of a power storage assembly in which unit modules according to an embodiment of the present invention are stacked.
4 is an exploded perspective view illustrating an ultra-high capacity capacitor having an electrode plate protruding outward according to an embodiment of the present invention.
5 is a perspective view for explaining the shape of the electrode plate applied to FIG.
6 is a perspective view of an ultra-high capacity capacitor having an outwardly projecting electrode plate according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The sizes and shapes of the components shown in the drawings may be exaggerated for clarity and convenience. In addition, terms defined in consideration of the configuration and operation of the present invention may be changed according to the intention or custom of the user, the operator. Definitions of these terms should be based on the content of this specification.

2 is a cross-sectional view of an ultra-high capacity capacitor according to an embodiment of the present invention. FIG. 3 is a cross-sectional view of a unit module according to an embodiment of the present invention. Sectional view of the stacked accumulation aggregate.

1 to 3, an ultra-high capacity capacitor according to an embodiment of the present invention includes a storage capacitor assembly 200 in which a plurality of unit modules 100 are stacked, An upper plate 310 sealingly mounted on an upper surface of the case 300 and a lower plate 320 sealingly mounted on a lower portion of the case 300. The lower plate 320 is provided with an upper case 310,

The case 300 is formed in the shape of a square box having openings on the upper and lower sides, and a plurality of first fastening holes 302 are formed in the vertical direction and are bolted together with the upper plate 310 and the lower plate 320.

The upper plate 310 is formed as a rectangular plate and covers the upper surface of the case 300. The upper plate 310 is integrally formed on the lower surface of the lid unit 312 and is inserted into the inner wall surface of the case 300, (314). A plurality of second fastening holes 316 are formed in the peripheral edge of the lid 312.

The second fastening holes 316 formed in the upper plate 310 are connected to the second fastening holes 302 formed in the case 300 and then the bolts 400 are fastened to each other.

A gasket 410 is provided on a surface of the lid 316 that is in contact with the upper surface of the case 300 to seal the lid 316 and the case 300.

The upper plate 310 can prevent the upper plate 310 from being bent even when the inner pressure of the case 300 is increased by integrally forming the protrusion 314 inserted into the case 300.

The lower plate 320 is formed as a rectangular plate and has a lid 322 covering the lower surface of the case 300. The lower plate 320 is integrally formed on the upper surface of the lid 322, (324). A plurality of third fastening holes 326 are formed in the peripheral edge of the lid portion 322.

Here, the bolt 400 passes through the second fastening hole 316 of the upper plate 310, the second fastening hole 302 of the case 300, and the third fastening hole 326 of the lower plate 326 Thereby coupling between the upper plate 310, the case 300 and the lower plate 320. [

A gasket 420 is provided on the upper surface of the lid part 322 to contact the lower surface of the case 300 to seal the lower plate 320 and the case 300.

The lower plate 320 can prevent the lower plate 320 from being bent even when the inner pressure of the case 300 is increased by integrally forming the protrusion 324 inserted into the case 300 on the upper surface.

On the inner surface of the upper plate 310 and the inner surface of the lower plate 320, reinforcing plates 330 and 332 are disposed to reinforce the strength. The reinforcing plates 330 and 332 are formed in the shape of a rectangular plate having a predetermined thickness and disposed on the upper and lower surfaces of the case 300 so as to reinforce the strength of the case 300. Even if the inner pressure of the case 300 increases, Thereby preventing the lower plate 320 from being deformed.

The reinforcing plates 330 and 332 are preferably made of PET.

On the inner surfaces of the reinforcing plates 330 and 332, a positive electrode plate 340 and a negative electrode plate 342, which are electrically connected to the power storage assembly 200, respectively, are disposed. Here, the positive electrode plate 340 may be a negative electrode plate, and the negative electrode plate 342 may be used as a positive electrode plate.

As shown in FIG. 3, the storage assembly 200 is formed by stacking a plurality of unit modules. The unit module 100 may be one of a cathode and an anode, and has a structure in which a cathode and an anode are alternately stacked.

The unit module 100 includes a current collector 10, a first active material layer 20 stacked on one surface of the current collector 10, a second active material layer 30 stacked on the other surface of the current collector 10, A first separator 40 laminated on the first active material layer 20 and a second separator 50 laminated on the second active material layer 30.

2, the unit module 100 includes a current collector 10, a first active material layer 20, a first separator film 40, a second separator film 50, a second active material layer 30, And the whole body 10 may be sequentially stacked.

The current collector 10 may be formed of an aluminum foil or a copper foil and may be a mesh having a plurality of through holes for efficiently performing ion movement and performing a uniform doping process.

One of the first active material layer 20 and the second active material layer 30 is a negative electrode active material layer and the other is a positive electrode active material layer. The activated carbon and the binder capable of reversibly doping and de- And a conductive material composed of carbon black, a solvent and the like may be included.

 The first separating film 40 and the second separating film 50 may be formed of a nonwoven fabric or a paper in a natural pulp system. In addition, a nanofiber may be produced by electrospinning a polymer material by an electrospinning method, Can be formed in the form of a nanoweb having pores.

Here, the current collector 10, the first and second active material layers 20 and 30, and the first and second separation membranes 40 and 50 have different sizes. That is, the optimum thickness and size of the first active material layer 20 and the second active material layer 30 are determined according to the purpose of use, and the first separator film 40 and the second separator film 50 The first active material layer 20 and the second active material layer 30 are formed on the first active material layer 20 and the second active material layer 30 so as to cover the first active material layer 20 and the second active material layer 30, The active material layer 10 is formed to have a larger size than the active material layer 30 and the plurality of stacked unit modules 100 are fixed to the casing in the subsequent process, 40 and the second separation membrane 50, respectively.

When the unit modules are stacked, a ring-shaped reinforcing member 360 is provided between the current collectors 10 to prevent the thickness of the unit modules 100 from being varied according to the stacking position.

That is, since the unit modules 100 are stacked with dozens of unit modules, the unit modules stacked on the lower side greatly act to reduce the thickness, and the unit modules stacked on the upper side act as small- The thickness of the unit module is varied depending on the stacking position, and the charge / discharge performance is deteriorated.

In order to solve this problem, in the present embodiment, the reinforcing member 360 is provided between the current collectors 10, and the upper surface of the reinforcing member 360 contacts the lower surface of the current collector 10 positioned above, Is in contact with the upper surface of the current collector 10 located at the lower side to prevent the thickness of the unit modules from varying from position to position.

The reinforcing member 360 is formed of a PET material and is formed in a ring shape so that its outer surface is in contact with the inner wall surface of the case 300 and the upper and lower surfaces thereof are in contact with the current collector 10 to support each of the unit modules. In addition, when the unit modules are stacked, the reinforcing member 360 aligns the unit modules 100, thereby preventing the alignment positions of the unit modules 100 from being changed when the unit modules 100 are stacked.

The super-high capacity capacitor according to an embodiment of the present invention stacks the unit module 100 inside the case to prevent leakage of the electrolyte in the lateral direction.

The protrusions 314 and 324 inserted into the case 300 are formed on the upper plate 310 and the lower plate 320 and the reinforcing plates 330 and 332 are disposed on the inner surfaces of the upper plate 310 and the lower plate 320 So that the upper plate 310 and the lower plate 320 are prevented from being bent by the pressure and leakage of the electrolyte is prevented.

A reinforcing member 360 is provided between the current collectors 10 of the unit module to prevent the thickness of the unit module from varying by the stacking position.

FIG. 4 is a perspective view of an ultra-high capacity capacitor having an electrode plate protruding outward according to an embodiment of the present invention, and FIG. 5 is a perspective view illustrating an ultra-high capacity capacitor having an electrode plate protruding outward according to an embodiment of the present invention FIG. 6 is a perspective view for explaining the shape of the electrode plate applied to FIG. 5; FIG.

4, the positive and negative electrode plates 340 and 342 are extended and the extended positive and negative electrode plates 340 and 342 are protruded outside the casing 300 of the ultra-high capacity capacitor 500 Terminal.

5, the regions extending from the positive and negative electrode plates 340 and 342 located between the reinforcing plates 330 and 332 and the storage assemblies 200 are bent at a plurality of stages and protruded out of the case 300 Terminal.

6, the regions 340b, 340c, and 340d extending from the positive electrode plate region 340a and the regions 342b, 342c, and 340d extending from the negative electrode plate region 342a, which are contained in the case 300, 342d are bent in two stages.

The regions 340b, 340c and 340d extending from the positive electrode plate region 340a and the regions 342b, 342c and 342d extending from the negative electrode plate region 342a are arranged so as to be separated from each other to prevent electrical shorting .

Although not shown in FIG. 5, the case 300 or the upper and lower plates 310 and 320 may have grooves that can accommodate extended regions of the positive and negative electrode plates 340 and 342, (Not shown) that performs a sealing function between the upper and lower plates 310 and 320 and the case 300 in consideration of the extended region of the upper and lower plates 340 and 342.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limited to the embodiments set forth herein. Various changes and modifications may be made by those skilled in the art.

10: current collector 20: first active material layer
30: second active material layer 40: first separator
50: second separator 100: unit module
200: charged aggregate 300: case
310: upper plate 320: lower plate
330,332: reinforcing plates 340, 342: electrode plate
360: reinforcement member 500: supercapacitor

Claims (11)

A power storage assembly in which a plurality of unit modules are stacked;
A case in which the storage assembly is disposed inside;
An upper plate sealably mounted on an upper surface of the case;
A lower plate sealably mounted on a lower portion of the case; And
And a reinforcing plate disposed on an inner surface of the upper plate and the lower plate to reinforce the strength of the upper plate and the lower plate, wherein the upper plate and the lower plate are integrally formed on the upper and lower surfaces of the case, And a protrusion inserted into the inner surface of the case. The method of claim 1, wherein
Wherein the reinforcing plate comprises a PET film. delete The method according to claim 1,
The case is formed with a plurality of first fastening holes in the circumferential direction, a plurality of second fastening holes are formed in the peripheral edge of the upper plate, and a plurality of third fastening holes And the first fastening hole, the second fastening hole, and the third fastening hole are fastened by one bolt. The method according to claim 1,
Wherein the unit module comprises: a current collector;
A first active material layer laminated on one surface of the current collector;
A second active material layer laminated on the other surface of the current collector;
A first separator laminated on the first active material layer; And
And a second separation layer stacked on the second active material layer. 6. The method of claim 5,
Wherein the unit modules are stacked in a plurality of layers to form a power storage assembly,
And a reinforcement member is mounted between current collectors of the unit module. The method according to claim 6,
Wherein the reinforcing member is formed in a ring shape so that an outer surface thereof is in contact with an inner wall surface of the case, and upper and lower surfaces are supported by the current collector. The method according to claim 6,
Wherein the reinforcing member is made of a PET material. The method according to claim 1,
Wherein the reinforcing plate is disposed between each of the upper plate and the lower plate and the accumulating aggregate,
Positive and negative electrode plates are interposed between the reinforcing plate and the power storage aggregate,
And an area extending from each of the positive electrode plate and the negative electrode plate protrudes to the outside of the case to form a terminal. 10. The method of claim 9,
And an area extending from each of the positive electrode plate and the negative electrode plate is bent in a multi-stage manner. 10. The method of claim 9,
Wherein a region extending from the positive electrode plate region and a region extending from the negative electrode plate region are spaced apart from each other.

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