KR20160115080A - Super Capacitor - Google Patents

Super Capacitor Download PDF

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Publication number
KR20160115080A
KR20160115080A KR1020150041833A KR20150041833A KR20160115080A KR 20160115080 A KR20160115080 A KR 20160115080A KR 1020150041833 A KR1020150041833 A KR 1020150041833A KR 20150041833 A KR20150041833 A KR 20150041833A KR 20160115080 A KR20160115080 A KR 20160115080A
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KR
South Korea
Prior art keywords
active material
material layer
disposed
storage assembly
separator
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KR1020150041833A
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Korean (ko)
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KR101744528B1 (en
Inventor
노형탁
김종관
최원길
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주식회사 아모텍
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Application filed by 주식회사 아모텍 filed Critical 주식회사 아모텍
Priority to KR1020150041833A priority Critical patent/KR101744528B1/en
Priority to PCT/KR2015/002942 priority patent/WO2016153092A1/en
Priority to US15/561,433 priority patent/US10204746B2/en
Publication of KR20160115080A publication Critical patent/KR20160115080A/en
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Publication of KR101744528B1 publication Critical patent/KR101744528B1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/78—Cases; Housings; Encapsulations; Mountings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/74—Terminals, e.g. extensions of current collectors

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Electric Double-Layer Capacitors Or The Like (AREA)

Abstract

An ultra-high capacity capacitor is provided. According to an exemplary embodiment of the present invention, there is provided an ultra-high capacity capacitor comprising: a storage assembly in which a plurality of unit modules are stacked; A sealing member disposed so as to surround side portions of the storage assemblies; Upper and lower plates respectively disposed on upper and lower portions of the power storage assembly; And a pressing force compensating member disposed between the upper and lower plates and the power storage assembly to prevent the central portion of the power storage assembly from being bent convexly toward the upper and lower plates. According to this, it is possible to improve the overall performance by reducing the thickness deviation by position, and to eliminate the impregnation imbalance and to generate uniform power regardless of the position.

Description

{Super Capacitor}

The present invention relates to an ultra-high capacity capacitor which is formed by stacking a plurality of unit modules so as to constitute a power accumulation assembly. The center portion of the accumulation assembly can be prevented from bending convexly in correspondence with the down force concentrated on the outer frame portion, Capacity capacitors capable of improving the discharge performance of bubbles.

Since the ultra high capacity capacitor utilizes the electrostatic characteristic, the charge / discharge cycle is almost infinite as compared with the battery using the electrochemical reaction, and it can be used semi-permanently. The charging / discharging speed of the energy is very fast, Of the battery.

Due to the characteristics of such ultra-high capacity capacitors, the application field is gradually expanding throughout the industry.

In particular, the utility as an energy buffer is increasing day by day in the development of next-generation environmentally friendly vehicles such as electric vehicles (EVs), hybrid electric vehicles (HEV) or fuel cell vehicles (FCVs) .

These ultra-high capacity capacitors are used in conjunction with batteries as auxiliary energy storage devices. That is, supercapacitor supply and absorption is performed by supercapacitor and energy supply of average vehicle is charged by battery, so that improvement of overall vehicle system efficiency and extension of life of energy storage system can be expected.

Such ultra-high capacity capacitors can be broadly classified into electric double layer capacitors (EDLC) and hybrid super capacitors using electrochemical oxidation-reduction reactions.

Electric double layer capacitors generate electric double layers on the surface to accumulate electric charges, while hybrid ultra high capacity capacitors accumulate electric charges by the oxidation-reduction reaction together with the electric double layer formed on the surface of the electrode material, thereby accumulating relatively more energy There is an advantage.

A power storage module of a conventional capacitor is disclosed in Korean Patent Laid-Open No. 10-2013-0016610 (February 18, 2013), in which a plurality of unit modules including an anode, a cathode, and a separator are stacked to constitute a power storage assembly, A pair of end plates is disposed on the outermost side of the storage assembly, and the storage assembly is fixed via a connection beam disposed along the edge of the end plate.

In the conventional power storage module, when the storage assemblage is fixed through the pair of end plates and the connecting beams, the connecting beams are concentrated on the outer frame side, so that the pressing force is severely generated toward the frame side where the connecting beam is located do.

Due to the difference in the pressing force, there is a problem that the power accumulating assembly disposed inside is bent in a convex shape at the center portion (a top phenomenon). This causes unevenness in the distance between the electrodes stacked in the vertical direction, which causes deterioration in performance.

In addition, when the electrolyte is filled in the capacitor, air bubbles generated when the electrolytic solution is impregnated toward the center portion where the pressure is relatively weak are formed due to the difference in the pressing force due to the positions, so that the positive and negative electrodes are impregnated with the electrolyte This is a factor that hinders the

As a result, impregnation imbalance between the electrodes is caused, and there is a difference in electric power generation between the electrode portions, so that there is a problem that heat generation and aging proceed rapidly.

KR 10-2013-0016610 A

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide an apparatus and a method for assembling a power accumulating assembly in which a pressing force compensating member is disposed between a plate and a power accumulating assembly to prevent a central portion of the power accumulating assembly from being bent convexly, And to provide an ultra-high capacity capacitor capable of reducing a deviation.

Also, the present invention provides an ultra-high-capacity capacitor capable of smoothly discharging bubbles generated when the electrolyte is impregnated through the gap by disposing the active material layer serving as the anode or the cathode in a divided structure and having a gap There is another purpose.

In order to solve the above-described problems, the present invention provides a power storage device comprising: a power storage assembly in which a plurality of unit modules are stacked; A sealing member disposed so as to surround side portions of the storage assemblies; Upper and lower plates respectively disposed on upper and lower portions of the power storage assembly; And a pressing force compensating member disposed between the upper and lower plates and the power storage assembly to prevent the central portion of the power storage assembly from being bent convexly toward the upper and lower plates.

Further, a pair of electrode plates corresponding to each other may be disposed between the uppermost surface of the storage assembly and the upper plate, and between the lowermost surface of the storage assembly and the lower plate.

The pair of electrode plates may be provided with protruding terminals extending outwardly from the electrode plate so as to be exposed to the outside of the sealing member.

An insulating layer may be disposed between the electrode plate and the upper and lower plates, respectively, and the force-compensating member may be disposed between the insulating layer and the electrode plate.

The pressing force compensating member may be disposed in a central region of the upper and lower plates and may have an area narrower than a sectional area of the active material layer provided in the storage assemblage.

Further, the push force compensating member may be provided to have a lower height toward the outer periphery with respect to the center point.

Further, the force reduction compensating member may be provided in a polygonal cross section including a round or rectangular cross section, or a combination thereof.

The unit module may further include: a separation membrane; An active material layer including a first active material layer laminated on one surface of the separator and a second active material layer laminated on the other surface of the separator; And a pair of current collectors stacked on one side of the first active material layer and the second active material layer, respectively.

The first active material layer and the second active material layer may be formed of two members, and the two members may be spaced apart from each other to form a passage through which bubbles are discharged.

In addition, the passages formed in the first active material layer and the second active material layer may have different directions.

In addition, the sealing member may be provided in a hollow shape so as to surround the current collector, and a plurality of the sealing members may be stacked in a vertical direction and may be integrated through a single connecting beam.

In addition, the connection beams may be provided along the rim of the sealing member, the lower end may be fixed to the lower plate, and the upper end may be fixed to the upper plate.

The separator may be formed to have a larger size than the active material layer, and the current collector may have a larger size than the separator.

According to the present invention, by compensating for the difference in the pressing force by the position corresponding to the pressing force concentrated on the outer frame portion through the pressing force compensating member disposed between the plate and the power accumulating assembly, the central portion of the power accumulating assembly is prevented from being bent Thereby reducing the thickness deviation per position, thereby improving the overall performance.

In addition, the present invention is characterized in that an active material layer serving as a cathode or an anode is formed in a divided structure and arranged so as to have a gap, so that bubbles generated when the electrolyte is impregnated through the gap can be smoothly discharged, Uniform power can be generated regardless of the position.

1 is an external view of an ultra-high capacity capacitor according to an embodiment of the present invention;
FIG. 2 is a sectional view of FIG. 1,
FIG. 3 is a schematic view showing a unit module constituting a power storage assembly in a super-capacity capacitor according to an embodiment of the present invention, in which a) shows a case where a nanofiber web layer is laminated on one surface of a nonwoven fabric layer, and b) When a nanofiber web layer is laminated on both sides,
Figure 4 shows a power storage assembly in Figure 1,
Figure 5 is a partial cutaway view of Figure 1,
Fig. 6 is a longitudinal sectional view of Fig. 1, schematically showing the depressing force for each position,
FIG. 7 is a view for explaining the magnitude of the down force for each position in an ultra-high capacity capacitor according to an embodiment of the present invention, wherein FIG. 7 (a) is a plan view showing a position where a connecting beam is fastened at upper and lower plates, Is a view showing the magnitude of the downward force generated by the power storage assembly due to the fastening position of the connection beam, c) a state where the power storage assembly is deformed by the downward pressing force,
FIG. 8 is a view showing another arrangement relationship of a gap formed in the first active material layer and a gap formed in the second active material layer in the unit module constituting the power storage assembly in FIG. 1,
9 is a view showing various forms of a force reduction compensating member in an ultra-high capacity capacitor according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same reference numerals are assigned to the same or similar components throughout the specification.

A super-high capacity capacitor 1 according to an embodiment of the present invention includes a storage assembly 10, a sealing member 20, upper and lower plates 30a and 30b, and a pressing force compensating member 40. [

The storage assembly 10 has a structure in which a plurality of unit modules 100 are stacked as shown in FIG.

3, the unit module 100 includes a separator 110, active material layers 120 and 130, and a current collector 140.

The first active material layer 120 and the second active material layer 130 are disposed on both sides of the separator 110 and the first active material layer 120 and the second active material layer 130 And a current collector 140 is stacked on one side of the current collector 140.

Here, the current collector 140, the first active material layer 120, the second active material layer 130, and the separation layer 110 may have different sizes.

That is, the separator 110 is formed to have a larger size than the first active material layer 120 and the second active material layer 130, and the current collector 140 has a larger size than the separator 110 Respectively. However, the first active material layer 120 and the second active material layer 130, which are disposed on both sides of the separator 110, have the same size.

The first active material layer 120 and the second active material layer 130 may be formed to have an optimal thickness and size in the design process according to the purpose of use, The first active material layer 120 and the second active material layer 130 may have a larger size than the first active material layer 120 and the second active material layer 130 so as to encapsulate the first active material layer 120 and the second active material layer 130.

The current collector 140 may have a larger size than the separator 110 so that the outer frame may be supported by the sealing member 20 to support the unit module 100.

The unit module 100 includes a current collector 140, a second active material layer 130, a separator 110, a first active material layer 120, and a current collector 140 sequentially stacked.

The unit module 100 'includes a first active material layer 130, a separator layer 110, a first active material layer 120, and a current collector 140 stacked in this order, On the upper side of the unit module 100 of FIG.

Accordingly, when the unit modules 100 and 100 'are stacked to form the storage assembly 10, the storage assembly 10 includes the current collector 140, the second active material layer 130, the separation membrane 110, The first active material layer 120, the current collector 140, the second active material layer 130, the separator film 110, the first active material layer 120, and the current collector 140 are sequentially stacked repeatedly .

Here, the separation membrane 110 may be formed by stacking two identical separation membranes. When the two separators are stacked, the total area capable of absorbing the electrolyte increases, thereby increasing the amount of the electrolyte absorbed toward the separator, thereby improving the overall performance.

The current collector 140 may be formed of a thin plate having a predetermined area and may be formed of a metal such as copper, aluminum, stainless steel, nickel, titanium, chromium, manganese, iron, cobalt, zinc, molybdenum, tungsten, silver, A metal thin plate manufactured by the method described above. In addition, it is also possible to provide a mesh type in which a plurality of through holes are formed for efficiently performing ion movement and performing a uniform doping process.

The first active material layer 120 and the second active material layer 130 are stacked on both sides of the separation layer 110. The first active material layer 120 and the second active material layer 130 may be either one of And the other one may be a cathode active material layer. The anode active material layer may include activated carbon and a binder capable of reversibly doping and dedoping ions, and may include a conductive material composed of carbon black, a solvent, and the like.

That is, the separator 110 is disposed on one surface of the first active material layer 120 and the second active material layer 130 and the current collector 140 is disposed on the other surface of the first active material layer 120 and the second active material layer 130, Or a cathode is formed and separated from the other polarity through the separator 110. [

The first active material layer 120 and the second active material layer 130 may be formed in the form of a sheet and then attached to one surface of the current collector 140. The active material, May be mixed to prepare a slurry, and then the slurry may be coated on one side of the current collector.

The first active material layer 120 and the second active material layer 130 are formed of two plate members 120a and 120b having a predetermined area and the two members 120a and 120b, 120b (130a, 130b) are disposed between the separation membrane 110 and the current collector 140 so as to be spaced apart from each other by a predetermined distance.

That is, predetermined gaps 122 and 132 are formed between the two members 120a and 120b (130a and 130b) along the center line of the separator 110 or the current collector 140.

In this case, the gap 122 formed in the first active material layer 120 and the gap 132 formed in the second active material layer 130 may be formed in the same direction as shown in FIG. 5, But may be formed to have different directions.

8, a gap 122 formed in the first active material layer 120 is formed in a direction parallel to the X-axis direction, and a gap 132 formed in the second active material layer 130 is formed. Axis direction may be formed in a direction parallel to the Y-axis direction.

These gaps 122 and 132 serve as passages through which the bubbles can move even if bubbles are generated in the process of impregnating the active material layers 120 and 130 and the separator 110 after the assembling of the storage assembly 10 is completed, It is possible to improve the dischargeability of the toner.

In other words, when a relatively small downward force is applied to the central portion of the storage assembly 10 as compared with the pressing force applied to the rim of the storage assembly 10, the first active material layer 120 and the second active material layer 130 ) Is impregnated into the electrolytic solution, the bubbles generated in the process are concentrated to the central portion where a relatively small down force is generated.

Accordingly, the air bubbles concentrated at the center portion form an air pocket that hinders the movement of the electrolytic solution, thereby preventing the active material layers 120 and 130 and the separator 110 from being uniformly impregnated with the electrolytic solution.

This causes a power difference depending on the position of the electrode due to the impregnation imbalance, thereby deteriorating the performance and causing a problem of rapid heat generation and aging due to impregnation imbalance.

In the present invention, gaps (122, 132) are formed at the center of the first active material layer (120) and the second active material layer (130) Even if the bubbles generated in the process of impregnating the electrolyte are concentrated toward the center side due to the difference in the relative lowering force, the bubbles can be smoothly discharged through the gaps 122 and 132, thereby preventing a difference in power generation by electrode position due to impregnation imbalance .

3, the separation membrane 110 may include a nonwoven fabric layer 112 and a nanofiber web layer 114 laminated on one side or both sides of the nonwoven fabric layer 112.

Here, the nanofiber web layer 114 may be a nanofiber containing at least one selected from the group consisting of polyacrylonitrile nanofiber and polyvinylidene fluoride nanofiber.

Preferably, only the polyacrylonitrile nanofibers may be formed to ensure the formation of radioactive and uniform pores in the formation of the nanofiber web layer 114. The polyacrylonitrile nanofibers of the nanofiber web layer 114 may have an average diameter of 0.1 to 2 mu m, and preferably 0.1 to 1.0 mu m.

This is because if the average diameter of the nanofibers is less than 0.1 탆, the separation membrane may not have sufficient heat resistance. If the average diameter exceeds 2 탆, the mechanical strength of the separation membrane is excellent, but the elasticity of the separation membrane may be reduced .

In addition, the nonwoven fabric constituting the nonwoven fabric layer 112 may be formed of a material selected from the group consisting of cellulose, cellulose acetate, polyvinyl alcohol (PVA), polysulfone, polyimide, polyetherimide, polyamide, polyethylene oxide (PEO), polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), polyurethane (PU), polymethyl methacrylate (PMMA), poly (methylmethacrylate), and polyacrylonitrile.

The nonwoven fabric layer 112 may further include inorganic additives such as SiO, SnO, SnO 2 , PbO 2 , ZnO, P 2 O 5 , CuO, MoO, V 2 O 5 , B 2 O 3 , Si 3 N 4 , CeO 2 , Mn 3 O 4 , Sn 2 P 2 O 7 , Sn 2 B 2 O 5 , Sn 2 BPO 6 , TiO 2 , BaTiO 3 , Li 2 O, LiF, N 3, may include a BaO, Na 2 O, Li 2 CO 3, CaCO 3, LiAlO 2, SiO 2, Al 2 O 3 and at least one selected from PTFE.

The inorganic particles as the inorganic additive may have an average particle diameter of 10 to 50 nm, preferably 10 to 30 nm, and more preferably 10 to 20 nm.

In addition, the average thickness of the separation membrane may be 10 to 121 탆, and preferably 10 to 50 탆.

If the average thickness of the separator is less than 10 탆, the separator is too thin to ensure long-term durability. If the average thickness exceeds 121 탆, it is disadvantageous for thinning.

The non-woven fabric layer 112 may have an average thickness of 10 to 30 μm, preferably 15 to 30 μm, and the nanofiber web layer may have an average thickness of 1 to 5 μm.

At this time, when the average thickness of the separation membrane 110 is 10 to 30 占 퐉, the air permeability may be 0 to 10 cfm. Also, the separation membrane 110 may have porosity of 30 to 50%.

Such a separation membrane 110 may be formed by conventional electrospinning, air electrospinning (AES), electrospray, electrobrown spinning, centrifugal electrospinning, flash electrospinning, electrospinning, etc., the nanofiber web layer 114 may be formed on one side or both sides of the nonwoven fabric layer 112, preferably by air electrospinning.

The separator 110 used in the present invention includes a nonwoven fabric layer 112 and a nanofiber web layer 114 laminated on one or both surfaces of the nonwoven fabric layer 112, It is composed of nanofibers containing at least one selected from polyacrylonitrile nanofiber and polyvinylidene fluoride nanofiber to prevent the electrolyte from easily escaping to the outside after containing impregnated electrolyte .

In this case, when a plurality of unit modules 100 and 100 'are stacked to form a storage assembly 10 and an electrolyte is injected to form an ultra-high capacity capacitor 1, an electrolyte having fluidity penetrates into the separation membrane 110 And is prevented from leaving the outside by the post-nanofiber web layer 114.

Therefore, the impregnation property of the separation membrane 110 is increased, and the electrolyte can sufficiently penetrate the separation membrane 110 regardless of the position where the separation membrane 110 is stacked. Accordingly, since the electrolyte is uniformly distributed in all the separation membranes 110, uniform power can be generated for each position regardless of the stacking positions, thereby improving the performance of the capacitors, and the heat generation and aging due to impregnation imbalance of the electrolyte can be rapidly It can be prevented from proceeding.

The sealing member 20 is disposed so as to surround the side portion of the storage assemblage 10 so as to prevent leakage of the electrolyte solution and to prevent electric short-circuiting. Such a sealing member 20 is provided in a hollow shape and is arranged such that its inner side is in contact with the rim of the current collector 140.

The sealing member 20 may be a single member, but a plurality of the sealing members 20 may be stacked to facilitate stacking of the unit modules 100.

That is, the sealing member 20 is provided in a hollow shape so as to surround the rim of the current collector 140, and a plurality of the sealing members 20 are stacked in a vertical direction. At this time, the sealing member 20 is disposed so that one side thereof is in contact with the rim of the current collector 140.

In other words, each of the sealing members 20 can be arranged to protrude by a predetermined length between a pair of current collectors 140 whose inner rim faces each other. Accordingly, the protruding portions are disposed between the pair of current collectors 140 stacked one above the other, so that the unit modules 100 are integrated.

And are integrated together with the upper and lower plates 30a and 30b disposed at the upper and lower ends of the storage assembly 10 through one connection beam 50 to seal the side of the power storage assembly 10 .

Here, the connection beam 50 may be formed of a material such as a ceramic, an insulating metal, or a polymer having chemical resistance, and a plurality of the connecting beams 50 are disposed along the rim of the sealing member 20.

In this case, each of the sealing members 20 is provided with a fastening hole 22 formed to pass through the connecting beam 50 in the height direction.

Accordingly, the connection beam 50 is installed to pass through the respective fastening holes 22, and the lower end is fixed to the lower plate 30b and the upper end is fixed to the upper plate 30a.

The sealing member 20 and the upper and lower plates 30a and 30b support the unit module 100 stacked in a plurality of layers by being integrated with the connecting beam 50, As shown in FIG.

The upper plate 30a is in close contact with the upper surface of the storage battery assembly 100 where the anode is disposed at the outermost side and the lower plate 30b is in close contact with the lower surface of the storage battery assembly 100, do. In addition, the positive electrode and the negative electrode of the storage assemblage 100 may be disposed so as to be in contact with the upper and lower plates 30a and 30b, respectively.

The upper and lower plates 30a and 30b disposed on the upper and lower sides of the storage assembly 10 are formed to have the same or larger area than the sum of the sealing member 20 and the current collector 140 So that the upper and lower plates 30a and 30b are capable of pressing the sealing member 20 disposed on the side of the storage assembly 10 when the connection beam 50 is fixed thereto.

Accordingly, even when a plurality of the sealing members 20 are provided and stacked in the vertical direction, the electrolyte can be prevented from leaking through the connection portions by being pressed by the upper and lower plates 30a and 30b.

A pair of electrode plates 60a and 60b corresponding to each other are formed between the uppermost surface of the storage assembly 10 and the upper plate 30a and between the lowest surface of the storage assembly 10 and the lower plate 30b .

The pair of electrode plates 60a and 60b protrude outward from the electrode plates 60a and 60b so that the electrode plates 60a and 60b are partially exposed to the outside of the sealing member 20 disposed on the side of the storage assemblies 10, (62a, 62b).

Here, one of the pair of electrode plates 60a and 60b serves as a negative terminal and the other serves as a positive terminal.

At this time, insulating layers 70a and 70b may be provided between the electrode plates 60a and 60b and the upper and lower plates 30a and 30b, respectively, to prevent an electrical short circuit. The insulating layers 70a and 70b are made of the same material as the sealing member 20 disposed on the side of the storage assemblies 10 to prevent electrical shorts and allow the electrolyte to flow through the electrode plates 60a and 60b It is possible to prevent leakage through a gap between the upper and lower plates 30a and 30b.

Between the upper and lower plates 30a and 30b and the storage assembly 10 is provided a pressing force compensating member 30 for preventing the central portion of the storage assembly 10 from being bent convexly toward the upper and lower plates 30a and 30b, (40) may be disposed.

When the sealing member 20 and the upper and lower plates 30a and 30b are fixed through the connecting beam 50 disposed along the circumferential direction of the sealing member 20, The central portion of the storage assembly 10 has a small down force due to the fastening force, while a relatively large down force is generated on the side of the rim, in other words, on the side of the rim 10 (Figs. 6 and 7 This is because when the storage assembly 10 is impregnated with the electrolytic solution, it is more severely generated due to the volume expansion due to impregnation of the electrolytic solution.

In FIG. 7B, the central region represents the area with the smallest descent force, and the smaller the color is, the larger the depressing force acts relatively.

That is, due to the difference in the pressing force due to the position, the accumulation aggregate 10 has a bulging phenomenon in which the central portion is deformed convexly. As a result, the stacked layers are bent together to form the storage assembly 10, which causes unevenness in the distance between the upper and lower electrodes, which is a factor that deteriorates performance.

In the present invention, the screw down force compensating member (40) is disposed in the central region of the upper and lower plates so as to prevent the deformation of the storage assembly (10) caused by the difference of the screw down position.

The reduction force compensating member 40 is arranged at the center of the storage assembly 10 having a relatively small reduction force to compensate for the pressing force at the center of the storage assembly 10, And the outer peripheral portion of the power storage assembly 10, thereby preventing a bulging phenomenon in which the central portion of the storage assembly 10 is bent convexly.

Accordingly, the unbalance between the upper and lower electrodes constituting the storage assembly 10 can be minimized, thereby improving the overall performance.

The force reduction compensating member 40 may be provided to have a cross section of a round cross section or a cross section including a rectangular cross section and a cross section of a combination thereof. For example, the force reduction compensating member 40 may be provided in a cylindrical shape having a predetermined area and height, a polygonal columnar shape, or a combination thereof.

The pressing force compensating member 40 may be disposed at a central region including the central points of the upper and lower plates 30a and 30b and may be disposed between the insulating layer 70 and the electrode plates 60a and 60b. have.

In addition, the force reduction compensating member 40 is provided to have a cross sectional area that is narrower than the cross sectional area of the active material layers 120 and 130 provided in the storage assemblage 10, thereby increasing the down force provided through the force reduction compensating member 40 The edge of the active material layers 120 and 130 can be prevented from being damaged.

9A and 9C, the abutting force compensating member 40 may be formed to have the same height or thickness as shown in FIGS. 9A and 9C. However, as shown in FIGS. 9B and 9D, As shown in FIG.

The pressing force compensating member 40 is provided so as to have a horizontal surface that is in contact with the insulating layers 70a and 70b and one side of the pressing force compensating member 40 that contacts the electrode plates 60a and 60b, Is formed into a curved surface so as to be gradually reduced.

This is to compensate the relatively large downward force on the center portion having the smallest drop force, so that a uniform downward force can be provided as a whole.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

1: super-high capacity capacitor 10:
20: sealing member 22: fastening hole
30a: upper plate 30b: lower plate
40: pressing force compensating member 50: connecting beam
60a, 60b: electrode plates 62a, 62b: projecting terminals
70a, 70b: insulating layer 100, 100 ': unit module
110: separator 112: nonwoven fabric layer
114: nanofiber web layer 120: first active material layer
122: gap 130: second active material layer
132: gap 140: collector

Claims (13)

A power storage assembly in which a plurality of unit modules are stacked;
A sealing member disposed so as to surround side portions of the storage assemblies;
Upper and lower plates respectively disposed on upper and lower portions of the power storage assembly; And
And a pressing force compensating member disposed between the upper and lower plates and the power storage assembly to prevent the central portion of the power storage assembly from being bent convexly toward the upper and lower plates. The method according to claim 1,
And a pair of electrode plates corresponding to each other are disposed between the uppermost surface of the storage aggregate and the upper plate and between the lowest surface of the storage aggregate and the lower plate. 3. The method of claim 2,
Wherein the pair of electrode plates are provided with protruding terminals each extending outwardly from the electrode plate so as to be exposed to the outside of the sealing member. 3. The method of claim 2,
Wherein an insulation layer is disposed between the electrode plate and the upper and lower plates, respectively, and the force for reducing force is disposed between the insulation layer and the electrode plate. The method according to claim 1,
Wherein the force reduction compensating member is disposed in a central region of the upper and lower plates and has an area narrower than a cross sectional area of the active material layer provided in the accumulation aggregate. The method according to claim 1,
Wherein the pushing force compensating member is provided to have a lower height toward an outer periphery with respect to a center point. The method according to claim 1,
Wherein the force reduction compensating member is provided in a polygonal cross section including a circular or rectangular cross section and a combination thereof. The method according to claim 1,
The unit module includes:
Separation membrane;
An active material layer including a first active material layer laminated on one surface of the separator and a second active material layer laminated on the other surface of the separator; And
And a pair of current collectors stacked on one side of the first active material layer and the second active material layer, respectively. 9. The method of claim 8,
Wherein the first active material layer and the second active material layer are formed of two members, and the two members are spaced apart from each other by a predetermined distance to form a passage through which bubbles are discharged. 10. The method of claim 9,
Wherein a passage formed in the first active material layer and a passage formed in the second active material layer have different directions. 9. The method of claim 8,
Wherein the sealing member is provided in a hollow shape so as to surround the current collector, and a plurality of the sealing members are vertically stacked and integrated through one connecting beam. 12. The method of claim 11,
Wherein the connection beam is provided along the rim of the sealing member, the lower end is fixed to the lower plate, and the upper end is fixed to the upper plate. 9. The method of claim 8,
Wherein the separator is provided to have a larger size than the active material layer, and the current collector is provided to have a larger size than the separator.
KR1020150041833A 2015-03-25 2015-03-25 Super Capacitor KR101744528B1 (en)

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PCT/KR2015/002942 WO2016153092A1 (en) 2015-03-25 2015-03-26 Separation membrane for super capacitor, super capacitor comprising same, and manufacturing method therefor
US15/561,433 US10204746B2 (en) 2015-03-25 2015-03-26 Separation membrane for super capacitor, super capacitor comprising same, and manufacturing method therefor

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KR20130016610A (en) 2011-08-08 2013-02-18 주식회사 아모텍 Electricity storage module

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JP2002100528A (en) * 2001-08-08 2002-04-05 Matsushita Electric Ind Co Ltd Capacitor and method of manufacturing the same

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KR20130016610A (en) 2011-08-08 2013-02-18 주식회사 아모텍 Electricity storage module

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