KR101416812B1

KR101416812B1 - Super capacitor of surface mount type having hermetic protecting layer

Info

Publication number: KR101416812B1
Application number: KR1020120156263A
Authority: KR
Inventors: 정일용
Original assignee: 비나텍주식회사
Priority date: 2012-12-28
Filing date: 2012-12-28
Publication date: 2014-07-09
Also published as: KR20140086137A

Abstract

The present invention relates to a surface mount type super capacitor having an airtight protective layer, and is intended to minimize the problem of leakage of a liquid electrolytic solution out of a sealed cell. A supercapacitor according to the present invention comprises a cell case, a cell, a cover case, and a hermetic protective layer. The cell case has a first pocket formed therein. The cell includes a first electrode electrically connected to the bottom surface of the first pocket of the cell case, a separator formed on the first electrode, a second electrode formed on the separator, and an electrolyte impregnated into the first and second electrodes . The lid case is formed with a second pocket into which the cell case is inserted, and an upper surface of the first pocket and an inner surface of the second pocket are joined to an outer surface of the cell case to form a cell mounting space in which the cell is mounted, And the bottom surface of the pocket is electrically connected to the second electrode. The airtight protection layer is formed by sealing the outer surface of the cell case except the lower surface of the cell case and the outer surface of the cover case with a sealing agent.

Description

TECHNICAL FIELD [0001] The present invention relates to a super-capacitor of a surface mount type having a hermetic protective layer,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a super capacitor, and more particularly, to a surface-mounted super capacitor having an airtight protection layer that can be surface-mounted on a substrate of an electronic device and provides enhanced airtight reliability to a cell- .

In addition to various portable electronic devices, there is a demand for electric power storage devices for electric vehicles and electric energy storage devices for systems for controlling or supplying instantaneous overload. Ni-MH A secondary battery such as a Ni-Cd battery, a lead-acid battery, and a lithium secondary battery, and a super capacitor, an aluminum electrolytic capacitor, and a ceramic capacitor having a high output density and close to unlimited charge / discharge life.

In particular, the super capacitor includes an electric double layer capacitor (EDLC), a pseudo capacitor, and a hybrid capacitor such as a lithium ion capacitor (LIC).

Here, the electric double layer capacitor is a capacitor using an electrostatic charge phenomenon occurring in an electric double layer formed at the interface of different phases, and has a charge / discharge speed faster than that of a battery in which the energy storage mechanism depends on a chemical reaction, And it is widely used as a backup power source, and the potential as an auxiliary power source for electric vehicles in the future is also unlimited.

A pseudocapacitor is a capacitor that converts a chemical reaction into electrical energy using an electrode and an oxidation-reduction reaction of an electrochemical oxide. The pseudocapacitor has a storage capacity about 5 times larger than that of the electric double layer capacitor because the electric double layer capacitor can store the electric charge near the surface of the electrode material as compared with the electric double layer capacitor formed on the surface of the electrochemical double layer type electrode. As the metal oxide electrode material, RuOx, IrOx, MnOx and the like are used.

And the lithium ion capacitor is a new concept secondary battery system which combines the high output and long life characteristics of the existing electric double layer capacitors and the high energy density of the lithium ion battery. Electric double layer capacitors using the physical adsorption reaction of electric charges in the electric double layer have been limited in their application to various applications due to their low energy density despite excellent power characteristics and lifetime characteristics. As a means for solving the problem of such an electric double layer capacitor, a lithium ion capacitor using a carbon-based material capable of inserting and separating lithium ions as a negative electrode active material has been proposed. The lithium ion capacitor has a structure in which lithium ions, And the cell voltage can realize a high voltage of 3.8 V or more, which is much higher than that of the conventional electric double layer capacitor by 2.5 V, and can exhibit a high energy density.

The basic structure of such a supercapacitor is composed of an electrode, an electrolyte, a current collector, and a separator having a relatively large surface area such as a porous electrode. A voltage of several volts is applied to both ends of the unit cell electrode, And the electrochemical mechanism generated by adsorption on the surface of the electrode moves along the electric field. These cells are sealed to the upper and lower cases made of metal, and the upper and lower terminals are attached to the outer surfaces of the upper and lower cases.

However, the conventional supercapacitor requires a gasket and a coating material for insulation and airtightness of the upper and lower cases, as well as a coating and pressing process. Therefore, the assembly and productivity are deteriorated and the cost is high I have a problem.

Further, since the upper and lower terminals are protruded to the outside of the upper and lower cases, the size of the supercapacitor is increased, and the mounting space occupies a lot of mounting space on the substrate of the electronic apparatus.

In addition, welding and defective defects frequently occur in the process of attaching the upper and lower terminals.

In addition, due to the heat acting in the process of manufacturing the super capacitor or the heat acting in the process of mounting the manufactured super capacitor on the electronic device, there is a problem that the portion sealing the cell is damaged and the liquid electrolyte is leaked. Particularly, the smaller the size of the supercapacitor, the more frequently such electrolyte leakage occurs.

These problems result in lowering the functionality and usability of the supercapacitor.

Korean Registered Patent No. 10-1211668 (December 13, 2012)

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a surface mount type super capacitor which can be surface mounted on a substrate of an electronic device and which simplifies the assembling process to improve the productivity.

Another object of the present invention is to provide a surface mount type super capacitor having an airtight protection layer capable of providing an improved airtight reliability to the space in which the cell is mounted.

In order to achieve the above object, the present invention provides a surface mount super capacitor including a cell case, a cell, a cover case, and a hermetic protection layer. The cell case has a first pocket formed therein. The cell includes a first electrode electrically connected to a bottom surface of a first pocket of the cell case, a separation membrane formed on the first electrode, a second electrode formed on the separation membrane, and a second electrode formed on the first and second electrodes, . The lid case is formed with a second pocket into which the cell case is inserted. An inner surface of the second pocket is connected to an upper end of the first pocket and an outer surface of the cell case, And a bottom surface of the second pocket is electrically connected to the second electrode. The airtight protection layer is formed by sealing the outer surface of the cell case and the outer surface of the cover case except the lower surface of the cell case with a sealing agent.

In the surface mount type super capacitor according to the present invention, the cell case has first and second external connection terminals electrically connected to the first and second electrodes on a lower surface thereof.

In the surface mount super capacitor according to the present invention, the cell case includes a cell case body, a cell mounting pad, a via hole, and a connection pattern. The cell case body is formed with the first pocket in an insulating property. The cell mounting pad is formed on a bottom surface of the first pocket, and the first electrode is connected and electrically connected. The via hole is formed through the bottom surface of the first pocket and electrically connected to the cell mounting pad and the first external connection terminal. The connection pattern is formed on an outer surface of the cell case body, and electrically connects the cover case coupled to the cell case to the second external connection terminal.

In the surface mount type supercapacitor according to the present invention, the material of the airtight protective layer may include a silicone resin, an epoxy resin, a conductive adhesive, or a metal.

In the surface mount super capacitor according to the present invention, the lid case coupled to the cell case is located above the bottom surface of the cell case, and the outer surface of the cell case and the end of the second pocket of the lid case Is covered by the airtight protection layer.

In the surface-mounted super capacitor according to the present invention, at least one groove is formed in the upper surface of the first pocket, and at least one groove is formed in the bottom surface of the second pocket, which is in contact with the upper surface of the first pocket. .

In the surface mount type super capacitor according to the present invention, a plurality of grooves may be formed on at least one side of the side surfaces of the cell case and the cover case which are in contact with each other.

In the surface-mounted super-capacitor according to the present invention, an adhesive may be interposed between the cell case and the cover case.

The surface mount super capacitor according to the present invention is characterized in that a cell case having a first pocket on which a cell is mounted is coupled to a cover case on which a second pocket is formed to seal the space in which the cell is mounted, The liquid electrolyte of the cell provided in the cell mounting space in which the cell case and the lid case are formed is sealed by sealing the cell case excluding the lower surface on which the connection terminal is formed and the outer surface of the lid case by sealing with an airtight protection layer, The problem of leaking out can be suppressed.

The surface mount super capacitor according to the present invention has a structure in which the lid case is coupled to the cell case so that the first pocket of the cell case can be positioned inside the second pocket. Therefore, the liquid electrolyte provided in the cell mounting space It is possible to prevent the leakage of the electrolyte by forming a long path for riding.

In addition, since the cell case and the cover case are realized in a box shape, and the cell case and the cover case of two boxes are overlapped to form a sealed cell mounting space, the surface mount type super capacitor according to the present invention It is possible to suppress the occurrence of leakage of the liquid electrolyte provided in the cell mounting space even if it is turned over during the process of handling the surface mount type super capacitor.

1 is an exploded perspective view showing a surface mount type super capacitor having an airtight protection layer according to a first embodiment of the present invention.
2 is an assembled perspective view of FIG.
3 is a sectional view taken along line 3-3 of Fig.
4 is a plan view showing the lower surface of the supercapacitor of FIG.
5 is a cross-sectional view illustrating a surface mount type super capacitor having an airtight protection layer according to a second embodiment of the present invention.
FIG. 6 is a cross-sectional view illustrating a surface mount type super capacitor having an airtight protection layer according to a third embodiment of the present invention.

In the following description, only parts necessary for understanding the embodiments of the present invention will be described, and the description of other parts will be omitted so as not to obscure the gist of the present invention.

The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary meanings and the inventor is not limited to the meaning of the terms in order to describe his invention in the best way. It should be interpreted as meaning and concept consistent with the technical idea of the present invention. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely preferred embodiments of the present invention, and are not intended to represent all of the technical ideas of the present invention, so that various equivalents And variations are possible.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First Embodiment

1 is an exploded perspective view showing a surface mount type super capacitor having an airtight protection layer according to a first embodiment of the present invention. 2 is an assembled perspective view of FIG. 3 is a sectional view taken along line 3-3 of Fig. And FIG. 4 is a plan view showing the lower surface of the supercapacitor of FIG. Here, the illustration of the airtight protective layer is omitted in order to show the cover case 40 in Figs. 1 and 2.

1 to 4, a surface mount super capacitor 100 according to the first embodiment includes a cell case 10, a cell 30, a cover case 40, and a protection layer 70 . The supercapacitor 100 includes a cell 30 accommodated in the cell case 10 and is mounted on the cell case 10. The cell 30 is covered with the lid case 40, And the cover case 40 are secondarily sealed with the airtight protection layer 70. [0064] At this time, the cell 30 includes a first electrode 31, a separation membrane 33, a second electrode 35, and an electrolyte.

Here, the cell case 10 is formed with a first pocket 13 in which the cell 30 can be housed and mounted. The cell case 10 includes a cell case body 21 and a circuit wiring pattern formed on the cell case body 21. The circuit wiring pattern includes a cell mounting pad 23, a via hole 25, a connection pattern 29, and external connection terminals 27 and 28. The external connection terminals 27 and 28 include a first external connection terminal 27 connected to the first electrode 31 and a second external connection terminal 28 connected to the second electrode 35. [

The cell case body 21 is formed with a first pocket 13 having an open top, and can be made of an insulating material. At this time, PPS (polyphenylene sulfide), PI (polyimide), FR4 or ceramics can be used as the material of the cell case body 21. [ Such a cell case body 21 may be realized in the form of a box in which one side is opened. For example, the cell case body 21 may be formed in a rectangular box shape, a tube shape, or the like.

The circuit wiring pattern is formed by the cell mounting pad 23 formed on the bottom surface 15 of the first pocket 13, the external connection terminals 27 and 28 formed on the lower surface 16 of the cell case body 21, A via hole 25 connecting the cell mounting pad 23 and the first external connection terminal 27 and a second connection terminal 28 formed on the external surface 11 of the cell case body 21 and connected to the second external connection terminal 28 As shown in Fig. At this time, the cell mounting pads 23 are formed on the bottom surface 15 of the first pocket 13, and the first electrodes 31 are electrically connected to each other through the first bonding member 51. The via hole 25 is formed through the bottom surface 15 of the first pocket 13 and electrically connects the cell mounting pad 23 and the first external connection terminal 27. The connection pattern 29 is connected to the first external connection terminal 27 and extends to the outer surface 11 of the cell case body 21 on the lower surface 16 of the cell case body, 10 and the second external connection terminal 28 are electrically connected to each other.

At this time, the first and second external connection terminals 27 and 28 are used as terminals capable of surface mounting on the substrate of the electronic apparatus. The first and second external connection terminals 27 and 28 have different lengths so that the operator can easily distinguish terminals connected to the first and second electrodes 27 and 28 after manufacturing the supercapacitor 100 .

The cell 30 is mounted on the cell mounting pad 23 of the first pocket 13 and includes a first electrode 31, a separation membrane 33, a second electrode 35 and an electrolyte. The first electrode 31 is electrically connected to the cell mounting pad 23 via the first bonding member 51. The separation membrane 33 is deposited on the first electrode 31. The second electrode (35) is deposited on the separator (33). Then, the electrolyte is impregnated into the first and second electrodes 31 and 35. At this time, the first electrode 31 and the second electrode 35 are either positive or negative and have different polarities. As the first bonding member 51, a carbon paste, a conductive polymer, a silver-epoxy adhesive, or the like may be used as the adhesive having electrical conductivity, but the present invention is not limited thereto. The first joining member 51 may be provided in the form of a liquid or a sheet. Such a cell 30 may be a cell forming a hybrid capacitor such as an electric double layer capacitor, a pseudo capacitor, or a lithium ion capacitor.

The lid case 40 covers the first pocket 13 in which the cell 30 is housed, and seals the area where the cell 30 is attached to the outside. In the cover case 40, a second pocket 43 into which the cell case 10 is inserted is formed. The bottom surface 45 of the second pocket 43 is electrically connected to the second electrode 35 via the second bonding member 53. In this case, The lid case 40 is formed so that the upper face 17 of the first pocket 13 and the inner side face 43a of the second pocket 43 on the outer side face 11 of the cell case 10 are connected to the third bonding member 55 To form a cell mounting space 50 in which the cell 30 is mounted.

The cover case 40 may be made of a metal having good electrical conductivity, such as copper, aluminum, nickel, iron, or an alloy thereof.

The lid case 40 coupled to the cell case 10 is positioned above the bottom surface 15 of the cell case 10 and is disposed on the inner surface of the lid case 40, 43a are joined and electrically connected to each other through the connection pattern 29 of the cell case 10 and the third bonding member 55. [ The second electrode 35 of the cell 30 is electrically connected to the second external connection terminal 28 by the connection pattern 29 through the cell case 10.

The cover case 40 can be realized in the form of a box having a second pocket 43 with an open top. The inner side surface 43a of the second pocket 43 corresponds to the outer side surface 11 of the cell case 10 so that the cell case 10 can be inserted into the second pocket 43 of the cover case 40 . &Lt; / RTI > For example, the cover case 40 may be formed in a square box, a tube shape, or the like as the cell case 10.

As the second and third bonding members 53 and 55, a carbon paste, a solder paste, a conductive polymer, a silver-epoxy adhesive, or the like may be used as an adhesive having electrical conductivity, but the present invention is not limited thereto.

The airtight protection layer 70 is formed by sealing the outer surface 11 of the cell case 10 and the outer surface 41 of the lid case 40 except the lower surface 16 of the cell case 10 with a sealing agent do. This airtight protection layer 70 provides airtightness to the space in which the cell 30 is mounted together with the cover case 40 and functions to protect the jointed portion of the cover case 40 from the external environment. In particular, the airtight protection layer 70 is formed by sealing a point where the outer surface 11 of the cell case 10, which is a path through which electrolyte leakage occurs, and the end of the second pocket 43 of the cover case 40, .

As the sealing agent for forming the hermetic sealing layer 70, a conductive material may be used, or a non-conductive material may be used. The airtight protection layer 70 can be formed by a method of applying a liquid sealing agent, a molding die method, a die casting method, or the like. The liquid sealing agent may be a material that can withstand the airtight protection layer 70 at a temperature that acts in reflow soldering in which the supercapacitor 100 is mounted on a substrate of an electronic device after drying or curing. For example, an epoxy resin, a silicone resin, a conductive adhesive agent, a metal material, and the like may be used, but the present invention is not limited thereto. In the case of a metal material, the airtight protection layer 70 can be formed by die casting.

As described above, the surface mount super capacitor 100 according to the first embodiment includes the cell case 10 having the first pocket 13 on which the cell 30 is mounted, the cover case 40 Are joined and joined together to primarily seal the space in which the cell 30 is mounted. The cell case 10 is formed by sealing the outer surfaces 11 and 41 of the cover case 40 with a sealing agent except for the lower surface 16 where the external connection terminals 27 and 28 of the cell case 10 are formed And is secondarily sealed with the airtight protection layer (70). Therefore, the liquid electrolyte of the cell 30 provided in the cell mounting space 50 in which the cell case 10 and the lid case 40 are formed can be prevented from leaking out.

Since the lid case 40 is coupled to the cell case 10 so that the first pocket 13 of the cell case 10 can be located inside the second pocket 43, 50 may be formed to have a long path along which the electrolyte flows, so that leakage of the electrolyte can be suppressed.

In addition, since the cell case 10 and the cover case 40 are realized in the form of a box, and the cell case 10 and the cover case 40 of two boxes are overlapped to form a sealed cell mounting space 50 , Leakage of the liquid electrolyte provided in the cell mounting space (50) can be suppressed even if the surface mount type super capacitor (100) is turned over after the fabrication is completed.

The supercapacitor 100 according to the first embodiment can be manufactured as follows. The first electrode 31 among the elements constituting the cell 30 is bonded to the cell mounting pad 23 of the cell case 10 via the first bonding member 51. [ Next, a separation membrane 33 is laminated on the first electrode 31. Next, a liquid electrolyte is provided in the first pocket 13 of the cell case 10.

Next, the second electrode 35 is bonded to the bottom surface 45 of the lid case 40 via the second bonding member 53.

The lid case 40 is coupled to the cell case 10 so that the first pockets 13 of the cell case 10 are covered with the second pockets 43 of the lid case 40 to seal them. At this time, a third joint member 55 is interposed between the cell case 10 and the cover case 40.

The outer side surface 11 of the cell case 10 and the outer side surface 41 of the lid case 40 are sealed with a sealing agent so as to form the airtight protective layer 70 except for the lower surface 16 of the cell case 10 The manufacturing process of the supercapacitor 100 according to the first embodiment is completed.

Second Embodiment

5 is a cross-sectional view showing a surface mount type super capacitor having an airtight protection layer 70 according to a second embodiment of the present invention. 5 is an enlarged view of one side edge portion of a portion into which the cell case 10 is inserted in the cover case 40. As shown in Fig.

5, in order to increase the coupling force between the cell case 10 and the cover case 40 and suppress the leakage of the electrolyte, the surface mount type super capacitor according to the second embodiment includes a cell case 10, At least one groove (19, 49) is formed at a point where the first and second grooves (40) are in contact with each other. At least one first groove 19 is formed in the upper end surface 17 of the first pocket 13 and the lower surface of the second pocket 43 contacting the upper end surface 17 of the first pocket 13 At least one second groove (49) is formed in the first groove (45). At this time, the first and second grooves 19 and 49 may be formed to be shifted from each other in order to form a long path along which the liquid electrolyte flows. Although the first and second grooves 19 and 49 are formed as square grooves, various types of grooves such as hemispheres and triangles may be formed.

The third joining member 55 is interposed not only on the side where the upper end face 17 of the first pocket 13 and the bottom face 45 of the second pocket 43 are in contact but also on the recesses 19 and 49 , It is possible to improve the bonding force between the cell case (10) and the lid case (40) while effectively suppressing the leakage of the liquid electrolyte.

On the other hand, the surface-mounted super-capacitor according to the second embodiment has the same structure as the surface-mounted super-capacitor according to the first embodiment, and thus its detailed description is omitted.

Third Embodiment

On the other hand, in the second embodiment, at least one (1) piece is provided on the top face 17 of the first pocket 13 and the bottom face 45 of the second pocket 43, which is in contact with the top face 17 of the first pocket 13, But the present invention is not limited to this. The grooves 19 and 49 may be formed on the side surfaces 11 and 43a of the cell case 10 and the cover case 40 which are in contact with each other as shown in FIG.

6 is a cross-sectional view showing a surface mount type super capacitor having the airtight protection layer 70 according to the third embodiment of the present invention.

6, in order to increase the coupling force between the cell case 10 and the cover case 40 and suppress the leakage of the electrolyte, the surface mount type super capacitor according to the third embodiment includes a cell case 10, And at least a plurality of grooves 19, 49 are formed at points where the grooves contact each other. A plurality of grooves 19 and 49 are formed in at least one side surface 11 and 43a of the side surfaces 11 and 43a of the cell case 10 and the cover case 40 which are in contact with each other. For example, in the third embodiment, grooves 19 and 49 are formed inwardly from the side surfaces 11 and 43a of the cell case 10 and the cover case 40, which are in contact with each other. At this time, the grooves 19 and 49 formed in the cell case 10 and the cover case 40 may be formed to be shifted from each other.

Since the surface-mounted super-capacitor according to the third embodiment has the same structure as that of the surface-mounted super-capacitor according to the first embodiment, detailed description thereof will be omitted.

4, the upper surface 17 of the first pocket 13 and the upper surface 17 of the second pocket 13, which are in contact with the upper surface 17 of the first pocket 13, At least one groove 19, 49 may be further formed on the bottom surface 45 of the base 43.

It should be noted that the embodiments disclosed in the present specification and drawings are only illustrative of specific examples for the purpose of understanding, and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

10: Cell case 11: Outer side
13: first pocket 15: bottom surface
16: lower surface 17: upper surface
19: first groove 21: cell case body
23: cell mounting pad 25: via hole
27: first external connection terminal 28: second external connection terminal
29: connection pattern 30: cell
31: first electrode 33: separation membrane
35: second electrode 40: cover case
41: outer side surface 43: second pocket
43a: inner side surface 45: bottom surface
49: second groove 50: cell mounting space
51: first joining member 53: second joining member
55: third bonding member 70: airtight protection layer
100: Surface mount type super capacitor

Claims

A cell case having a first pocket formed therein;
A first electrode electrically connected to a bottom surface of the first pocket of the cell case, a separator formed on the first electrode, a second electrode formed on the separator, and an electrolyte impregnated into the first and second electrodes, A cell;
A second pocket for receiving the cell case is formed and an inner surface of the second pocket is joined to an upper surface of the first pocket and an outer surface of the cell case to form a cell mounting space in which the cell is mounted, And a bottom surface of the second pocket is electrically connected to the second electrode;
And an airtight protection layer formed by sealing the outer surface of the cell case and the outer surface of the lid case with the sealing agent except the lower surface of the cell case,
The cell case includes:
An insulative cell case body having the first pocket formed therein;
First and second external connection terminals formed on a lower surface of the cell case body and electrically connected to the first and second electrodes, respectively;
A cell mounting pad formed on a bottom surface of the first pocket and electrically connected to the first electrode;
A via hole formed through the bottom surface of the first pocket and electrically connected to the cell mounting pad and the first external connection terminal;
And a connection pattern formed on an outer surface of the cell case body and electrically connecting the cover case coupled to the cell case to the second external connection terminal,
The lid case coupled to the cell case is located above the bottom surface of the cell case and the point where the outer surface of the cell case meets the end of the second pocket of the lid case is covered by the airtight protective layer. Wherein the surface protection layer is formed on the surface of the protection layer.

The method according to claim 1,
Wherein the cell case body is made of PPS (Polyphenylene Sulfide), PI (Polyimide), FR4, or a ceramic material.

The method according to claim 1,
Wherein the first and second external connection terminals are formed to have different lengths. &Lt; RTI ID = 0.0 > 11. < / RTI >

The method according to claim 1,
Wherein the material of the airtight protection layer comprises a silicone resin, an epoxy resin, a conductive adhesive, or a metal.

The method according to claim 1,
Wherein the cover case is made of copper, aluminum, nickel, iron, or an alloy thereof.

The method according to claim 1,
Wherein at least one groove is formed in the upper surface of the first pocket and at least one groove is formed in the bottom surface of the second pocket in contact with the upper surface of the first pocket. Surface Mount Type Super Capacitor.

The method according to claim 1,
Wherein a plurality of grooves are formed on at least one side of the side surfaces of the cell case and the cover case which are in contact with each other.

The method according to claim 6,
Wherein an adhesive is interposed between the cell case and the cover case.