Source: https://patents.google.com/patent/KR101274806B1/en
Timestamp: 2020-08-12 05:00:01
Document Index: 781144361

Matched Legal Cases: ['art 21', 'art 23', 'art 25', 'art 23', 'art 21', 'art 11', 'art 25', 'art 21', 'art 25', 'art 21', 'art 25', 'art 25', 'art 25', 'art 25', 'art 23', 'art 25', 'art 25']

KR101274806B1 - Rechargeable battery - Google Patents
KR101274806B1
KR101274806B1 KR1020110073880A KR20110073880A KR101274806B1 KR 101274806 B1 KR101274806 B1 KR 101274806B1 KR 1020110073880 A KR1020110073880 A KR 1020110073880A KR 20110073880 A KR20110073880 A KR 20110073880A KR 101274806 B1 KR101274806 B1 KR 101274806B1
KR1020110073880A
KR20130012627A (en
변상원
윤해권
한민열
2011-07-26 Application filed by 로베르트 보쉬 게엠베하, 삼성에스디아이 주식회사 filed Critical 로베르트 보쉬 게엠베하
2011-07-26 Priority to KR1020110073880A priority Critical patent/KR101274806B1/en
2013-02-05 Publication of KR20130012627A publication Critical patent/KR20130012627A/en
2013-06-13 Publication of KR101274806B1 publication Critical patent/KR101274806B1/en
The present invention relates to a secondary battery that not only prevents excessive increase in internal pressure by operating an fuse by causing an internal short circuit when the internal pressure rises, but also has stability against a short circuit caused by external factors.
As an example, an electrode assembly; A case for accommodating the electrode assembly; A cap assembly having a shorting hole and including a cap plate for sealing an opening of the case; And a shorting member installed in the shorting hole, a shorting member including a connection plate installed to cover at least a portion of the shorting hole on an outer side of the cap plate and electrically connected to the electrode assembly. The cap assembly is provided with a secondary battery, which is electrically insulated from the electrode assembly.
BACKGROUND ART A rechargeable battery is a battery which can be charged and discharged unlike a primary battery which can not be charged. In the case of a low-capacity battery in which one battery cell is packed, the rechargeable battery is used in a portable electronic device such as a mobile phone and a camcorder , And a large-capacity battery of a battery pack unit having dozens of battery packs is widely used as a power source for driving a motor such as a hybrid vehicle.
Secondary batteries are manufactured in various shapes. Representative shapes include cylindrical shapes and square shapes, and an electrode assembly and an electrolyte formed between a positive and negative plates through an insulator separator are installed in a case, and an electrode terminal is provided in the case. It is configured by installing the formed cap assembly.
On the other hand, when the secondary battery generates excessive heat due to overcharging or the like or the electrolyte is decomposed, the internal pressure may rise to ignite or explode. Accordingly, there is a demand for a secondary battery having a structure capable of improving safety.
SUMMARY OF THE INVENTION An object of the present invention is to provide a secondary battery which not only prevents excessive increase in the internal pressure by operating an fuse by causing an internal short circuit when the internal pressure of the secondary battery rises, but also has stability against a short circuit caused by external factors. .
In order to achieve the above object, a secondary battery according to the present invention includes an electrode assembly; A case for accommodating the electrode assembly; A cap assembly having a shorting hole and including a cap plate for sealing an opening of the case; And a shorting member installed in the shorting hole, a shorting member including a connection plate installed to cover at least a portion of the shorting hole on an outer side of the cap plate and electrically connected to the electrode assembly. The cap assembly may be electrically insulated from the electrode assembly.
In addition, the electrode assembly may include a first electrode plate and a second electrode plate, and the shorting member may include a first shorting member installed on one side of the cap plate and a second shorting member provided on the other side.
In addition, the short plate may be in contact with the connection plate when the internal pressure of the secondary battery is greater than the set pressure,
The shorting plate may include a rounded portion formed convexly toward the electrode assembly; And it may be made of a reverse plate comprising an edge portion fixed to the cap plate,
The secondary battery may further include an upper insulating member disposed between the connection plate and the cap plate and having an opening corresponding to the shorting hole.
The short circuit plate may be in surface contact with the connection plate when the internal pressure of the secondary battery is greater than a predetermined pressure.
The surface of the connection plate contacting the shorting plate may have a concave shape, and the surface of the connection plate contacting the connection plate may have a flat shape.
In addition, the secondary battery according to the present invention for achieving the above object comprises an electrode assembly comprising a first electrode plate and a second electrode plate; A case for accommodating the electrode assembly; A first electrode terminal electrically connected to the first electrode plate, a second electrode terminal electrically connected to the second electrode plate, a first short circuit hole and a second short circuit hole to seal the opening of the case; A cap assembly including a cap plate electrically insulated from the first electrode terminal and the second electrode terminal; A first shorting plate installed in the first shorting hole, and a first connection plate installed to cover at least a portion of the first shorting hole on an outer side of the cap plate and electrically connected to the first electrode terminal; A first shorting member; And a second shorting plate installed in the second shorting hole, and a second connecting plate installed to cover at least a portion of the second shorting hole on an outer side of the cap plate and electrically connected to the second electrode terminal. A second short circuit member may be included.
The first shorting plate and the second shorting plate may be in contact with the first connecting plate and the second connecting plate, respectively, when an internal pressure of the secondary battery is greater than a set pressure.
The first shorting plate and the second shorting plate may include round portions formed convexly toward the electrode assembly; And it may include an edge fixed to the cap plate,
The secondary battery may include a first upper insulating member disposed between a first connection plate and the cap plate and having an opening corresponding to the first shorting hole; And a second upper insulating member disposed between the second connecting plate and the cap plate and having an opening corresponding to the second shorting hole.
The first shorting plate and the second shorting plate may be in surface contact with the first connecting plate and the second connecting plate, respectively, when an internal pressure of the secondary battery is greater than a set pressure.
The surface in contact with the short-circuit plate of the connecting plate may be one having a concave shape,
A surface of the shorting plate that contacts the connection plate may have a flat shape.
In addition, the secondary battery may further include at least one fuse unit installed on a current path of the secondary battery.
The secondary battery according to the present invention not only has an effect of preventing excessive pressure rise due to internal factors such as overcharging, but also an effect of preventing short circuit due to external factors such as when the outer case is penetrated.
1 is a complete perspective view of a secondary battery according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of the rechargeable battery illustrated in FIG. 1 taken along line II ′.
FIG. 3A is an enlarged view of a portion A (short member) shown in FIG. 2 and shows the short circuit plate before inversion.
3B is a view showing after the shorting plate shown in FIG. 3A is reversed.
4A and 4B are partial cross-sectional views of a rechargeable battery according to another exemplary embodiment of the present invention.
5A and 5B are partial cross-sectional views of a rechargeable battery according to still another exemplary embodiment of the present invention.
1 is a complete perspective view of a secondary battery according to an embodiment of the present invention, Figure 2 is a cross-sectional view taken along the line II-I secondary battery shown in FIG. 3A is an enlarged view of a portion A (short member) shown in FIG. 2, which shows before the shorting plate is reversed, and FIG. 3B shows after the shorting plate shown in FIG. 3A is reversed.
1 and 2, the secondary battery 100 according to an embodiment of the present invention includes an electrode assembly 10, a first current collector plate 20, a second current collector plate 30, a case 40, Cap assembly 50 and shorting member 60.
The electrode assembly 10 is formed by winding or stacking a laminate of the first electrode plate 11, the separator 13, and the second electrode plate 12 formed in a thin plate shape or a film shape. Here, the first electrode plate 11 may act as an anode, and the second electrode plate 12 may act as a cathode.
The first electrode plate 11 is formed by applying a first electrode active material such as a transition metal oxide to a first electrode current collector formed of a metal foil such as aluminum, and is a first electrode uncoated region that is not coated with the first active material. Section 11a. The first electrode uncoated portion 11a serves as a passage for current flow between the first electrode plate 11 and the outside of the first electrode plate. In the present invention, the material of the first electrode plate 11 is not limited.
The second electrode plate 12 is formed by applying a second electrode active material such as graphite or carbon to a second electrode current collector formed of a metal foil such as nickel or copper, and is a second uncoated region. The electrode non-coating portion 12a is included. The second electrode supporting portion 12a serves as a passage for current flow between the second electrode plate 12 and the outside of the second electrode plate. In the present invention, the material of the second electrode plate 12 is not limited.
In addition, the first electrode plate 11 and the second electrode plate 12 as described above may be arranged with different polarities.
The separator 13 is positioned between the first electrode plate 11 and the second electrode plate 12 to prevent shorting and to allow movement of lithium ions. The separator 13 is made of polyethylene, polypropylene, or poly It consists of a composite film of ethylene and polypropylene. On the other hand, the material of the separator 13 is not limited in the present invention.
The first collector plate 20 and the second collector plate 30, which are electrically connected to each of the first electrode plate 11 and the second electrode plate 12, are coupled to both ends of the electrode assembly 10.
The first collector plate 20 is made of a conductive material such as aluminum, and is in contact with the first electrode uncoated portion 11a protruding to one end of the electrode assembly 10, thereby electrically contacting the first electrode plate 11. Is connected. Referring to FIG. 2, the first current collector plate 20 may include a first connection part 21, a first extension part 23, a first terminal hole 24, and a fuse part 25. have.
The first connection portion 21 is installed between the upper portion of the electrode assembly 10 and the lower portion of the cap assembly 50, it is formed in the form of a plate.
The first extension part 23 is bent and extended at an end of the first connection part 21, and is formed in a plate shape substantially in contact with the first electrode uncoated part 11a. Here, the corner where the first connection portion 21 and the first extension portion 23 meet is referred to as "C", the first connection portion 21 and the first extension portion 23 is the corner (C). Can be perpendicular to the center.
The first terminal hole 24 is formed at one side of the first connecting portion 21, and provides a space in which the first electrode terminal 52 of the cap assembly 50 is fitted to be coupled among the first connecting portions 21. . Here, the first terminal hole 24 is located far from the corner C of the connecting portion 22.
The fuse part 25 is formed on the upper region of the electrode assembly 10, that is, the first connection part 21 so as not to contact the electrolyte solution. In addition, the fuse part 25 is positioned in an area adjacent to the edge C of the first connection part 21 so as not to overlap the first electrode terminal 52 coupled to the first terminal hole 24. Specifically, the fuse part 25 has a fuse hole 25a and a reinforcing protrusion 25b protruding from the periphery of the fuse hole 25a. The fuse hole 25a serves to block current flow by melting a region in which the fuse hole 25a is formed by heat generated when a large current flows due to a short circuit in the secondary battery 100. The reinforcing protrusion 25b has a strength reinforcing function for reinforcing the strength of a region where the fuse hole 25a is formed against external impact before a short circuit occurs in the secondary battery 100.
In FIG. 2, only the case in which the fuse part 25 is formed in the first current collector plate 20 is illustrated. However, since the fuse part 25 functions to block current when an overcurrent flows in the secondary battery, Even if the current collector plate 20 is not provided, it is possible to operate when provided on the current path of the secondary battery. Therefore, the fuse part 25 may be provided in the second collector plate 30 instead of the first collector plate 20, or may be provided in both.
The second current collecting plate 30 is formed of a conductive material such as nickel, and is in contact with the second electrode uncoated portion 12a protruding to the other end of the electrode assembly 10, thereby electrically contacting the second electrode plate 12. Is connected. The second collector plate 30 includes a second connection portion 31, a second extension portion 33, and a second terminal hole 34.
The second connection portion 31, the second extension portion 33, and the second terminal hole 34 of the second current collector plate 30 are connected to the first connection portion of the first current collector plate 20 illustrated in FIG. 2. 21 and the first extension part 23 and the first terminal hole 24 each have the same shape and play the same role, and thus redundant descriptions thereof will be omitted.
The case 40 is formed of a conductive metal such as aluminum, aluminum alloy or nickel-plated steel, and the electrode assembly 10, the first current collector plate 20 and the second current collector plate 30 can be inserted And has an approximately hexahedron shape in which an opening portion is formed. In FIG. 2, since the case 40 and the cap assembly 50 are shown coupled, an opening is not shown, but the circumferential portion of the cap assembly 50 is a substantially open portion. On the other hand, it is preferable that the inner surface of the case 40 is insulated so as to maintain an electrical insulation state with the electrode assembly 10, the first current collecting plate 20, the second current collecting plate 30, and the cap assembly 50.
The cap assembly 50 is coupled to the case 40. Specifically, the cap assembly 50 may include a cap plate 51, a first electrode terminal 52, a second electrode terminal 53, a gasket 54, and a nut 55. In addition, the cap assembly 50 may include a stopper 56, a vent plate 57, an upper insulating member 58, and a lower insulating member 59.
The cap plate 51 seals the opening of the case 40 and may be formed of the same material as the case 40. The cap plate 51 may have an electrolyte injection hole 51a, a vent hole 51b, and a short circuit hole 51c. Here, the inner surface of the short circuit hole 51c may be formed in a step shape and may include at least one stepped surface SS.
The first electrode terminal 52 penetrates one side of the cap plate 51 and is electrically connected to the first current collecting plate 20. The first electrode terminal 52 may be formed in a columnar shape, and threads are formed on the outer circumference of the upper pillar exposed to the upper portion of the cap plate 51. In addition, a flange 52a is formed on the lower pillar positioned below the cap plate 51 so that the first electrode terminal 52 does not come off from the cap plate 51, and among the first electrode terminals 52, a flange ( 52a) some of the pillars positioned under the lower portion of the first current collector plate 20 are fitted into the first terminal hole 24 of the first current collector plate 20.
The second electrode terminal 53 penetrates the other side of the cap plate 51 and is electrically connected to the second current collecting plate 30. Since the second electrode terminal 53 has the same shape as the first electrode terminal 52, duplicated description will be omitted.
The gasket 54 is formed of an insulating material between each of the first electrode terminal 52 and the second electrode terminal 53 and the cap plate 51 to form the first electrode terminal 52 and the second electrode terminal 53. The space between each and the cap plate 51 is sealed. The gasket 54 prevents external moisture from penetrating the inside of the secondary battery 100 and prevents the electrolyte solution contained in the secondary battery 100 from flowing out.
The nut 55 is fastened along a screw thread formed in each of the first electrode terminal 52 and the second electrode terminal 53 so that each of the first electrode terminal 52 and the second electrode terminal 53 may be cap plate 51. ).
The stopper 56 seals the electrolyte injection hole 51a of the cap plate 51. In addition, the vent plate 57 is installed in the vent hole 51b of the cap plate 51 and includes a notch 57a formed to be opened at a set pressure.
The upper insulating member 58 is formed to sandwich the second electrode terminal 53 between the second electrode terminal 53 and the cap plate 51, and is in close contact with the cap plate 51 and the gasket 54. The upper insulating member 58 insulates the second electrode terminal 53 and the cap plate 51 and also insulates the connection plate 62 and the cap plate 51 which will be described later.
The lower insulating member 59 is formed between each of the first current collector plate 20 and the second current collector plate 30 and the cap plate 51 to prevent unnecessary internal short circuits.
As described above, the first electrode terminal 52 and the second electrode terminal 53 are insulated from the cap plate 51 by the gasket 54, the upper insulating member 58, and the lower insulating member 59. . Thus, the case 40 and the cap plate 51 maintain an electrically neutral state. Therefore, in the secondary battery 100, the electrode assembly 10 is in contact with the case 40 or the cap plate 51, thereby reducing the risk of a short circuit, thereby ensuring safety in use.
The short circuit member 60 is installed at one side and the other side of the cap assembly 50, and induces a short circuit when the internal pressure of the secondary battery 100 becomes greater than the set pressure due to overcharging, etc. Block the flow of The first shorting member 60 provided on one side of the cap assembly 50 and the second shorting member 60 provided on the other side have the same shape and serve the same role. Therefore, only the first shorting member 60 positioned closer to the second electrode terminal 53 than the first electrode terminal 52 will be described, and a redundant description of the other one will be omitted. (Hereinafter, it will be called the short circuit member 60.)
3A and 3B, the short circuit member 60 may include a short circuit plate 61 and a connection plate 62 of a conductive material.
The shorting plate 61 is installed in the shorting hole 51c of the cap plate 51. The short plate 61 has a round portion 61a which is convex (see FIG. 3A) in the direction toward the electrode assembly 10, and an edge portion fixed to the step surface SS formed on the inner surface of the short circuit hole 51c. It consists of an inversion plate containing 61b. The shorting plate 61 may be inverted and protrude convexly in a direction away from the electrode assembly 10 when the internal pressure of the secondary battery 100 becomes greater than the set pressure. (See FIG. 3B). 61 may be formed of an aluminum material, but the present invention is not limited thereto. If the thickness of the shorting plate 61 is too thin, it is difficult to maintain the shorting state because the shorting plate 61 is melted before the fuse unit 25 is operated even when the shorting occurs. In addition, when the thickness of the short plate 61 is too thick, there may be a problem that the inversion is not. Therefore, the shorting plate 61 preferably has a thickness of approximately 0.4 mm to 0.6 mm. However, the present invention is not limited to the thickness in the above range.
The connection plate 62 is formed to fit the second electrode terminal 53 at an outer side of the cap plate 51 and extends to cover at least a portion of the short circuit hole 51c. The connecting plate 62 is electrically connected to the second electrode terminal 53. Here, the connection plate 62 may be formed in a flat plate shape, it may be formed of a copper material, but this does not limit the present invention. If the thickness of the connection plate 62 is too thin, the short circuit state is hardly maintained because the connection plate 62 is melted before the fuse unit 25 is operated even when a short circuit occurs. Therefore, the connecting plate 62 preferably has a thickness of 1 mm or more. However, this does not limit the present invention.
As described above, in the normal state of the secondary battery 100, both the first electrode terminal 52 and the second electrode terminal 53 are insulated from the cap plate 51, so that the case 40 and the cap The plate 51 is maintained in an electrically neutral state, resulting in an effect of reducing the risk of short circuit.
In addition, when the internal pressure rises above the set pressure due to a cause such as overcharging, the secondary battery 100 operates the short circuit member 60 so that both the first electrode terminal 52 and the second electrode terminal 53 are capped. By being in the state of being electrically connected to the plate 51, the fuse unit 25 is operated to bring the effect of ensuring safety in use.
Next, a secondary battery according to another embodiment of the present invention will be described.
4A is an enlarged cross-sectional view of a portion of a rechargeable battery corresponding to portion “A” of FIG. 2 according to another embodiment of the present invention, and FIG. 4B is a cross-sectional view illustrating a case in which the shorting plate of FIG. 4A contacts the connection plate.
Secondary battery according to another embodiment of the present invention is different from the configuration of the connecting plate 162 of the short circuit member 160 compared to the secondary battery 100 shown in FIG. 2 only the other components have the same shape, Do the same. Therefore, the description and overlapping description of the same configuration will be omitted, and the connection plate 162 will be mainly described.
Referring to FIG. 4A, the short circuit member 160 of the rechargeable battery according to another exemplary embodiment of the present invention includes a short circuit member 61 and a connection plate 162 of a conductive material.
The connecting plate 162 is similar to the connecting plate 62 shown in FIG. 3A. However, when the shorting plate 61 is inverted as shown in FIG. 3B, the connection plate 162 is formed to be concave in a shape corresponding to the shorting plate 61. In this case, the contact area between the shorting plate 61 and the connecting plate 162 is increased by surface contact, thereby reducing contact resistance. Therefore, the short circuit plate 61 and the connection plate 162 may be melted before the fuse unit 25 is operated, thereby reducing the phenomenon that the short circuit state cannot be maintained, and the fuse unit 25 is secured by flowing a large current. Can work.
FIG. 5A is an enlarged cross-sectional view of a portion of a rechargeable battery corresponding to portion “A” of FIG. 2, and FIG. 5B is a cross-sectional view illustrating a case in which the shorting plate of FIG. 5A contacts the connection plate. .
Secondary battery according to another embodiment of the present invention differs only in the configuration of the short-circuit plate 261 of the short circuit member 260 compared to the secondary battery 100 shown in Figure 2 other components have the same shape , Do the same. Therefore, the description of the same configuration and overlapping description will be omitted, and the connection plate 261 will be mainly described.
Referring to FIG. 5A, a shorting member 260 of a rechargeable battery according to another exemplary embodiment of the present invention includes a shorting member 261 made of a conductive material and a connection plate 62.
The shorting plate 261 is similar to the shorting plate 61 shown in FIG. 3A. However, when the shorting plate 261 is inverted as shown in FIG. 3B, a surface contacting the connecting plate 62 is formed flat in a shape corresponding to the connecting plate 62. In this case, the contact area between the shorting plate 261 and the connecting plate 62 is increased by surface contact, thereby reducing the contact resistance. Therefore, the short circuit plate 261 and the connection plate 162 may be melted before the fuse part 25 is operated to reduce the phenomenon in which the short circuit state is not maintained, and the fuse part 25 is secured by flowing a large current. Can work.
Although the present invention has been described with reference to the embodiments illustrated in the accompanying drawings, it is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Could be.
10 electrode assembly 20 first current collector plate
30: 2nd collecting plate 40: Case
50: cap assembly 60, 160, 260: short circuit member
61, 261: Short circuit play 62, 162: Connection plate
A case for accommodating the electrode assembly;
At least one electrode terminal electrically connected to the electrode assembly and having different polarities;
A cap plate having at least one short circuit hole and sealing the opening of the case; And
A short circuit member installed at each of the short circuit holes, a short circuit member provided to cover at least a portion of the short circuit hole at an outer side of the cap plate, and a connection plate electrically connected to the electrode terminals, respectively;
The case and the cap plate are insulated from the electrode assembly to maintain an electrically neutral state. When the internal pressure of the case is greater than a set pressure, the shorting plate contacts the connection plate, respectively, and the electrode terminal is connected to the case and the cap and the cap plate. Secondary battery, characterized in that the short circuit with each other through the cap plate.
The electrode assembly includes a first electrode plate and a second electrode plate,
The electrode terminal,
A first electrode terminal electrically connected to the first electrode plate; And
A second electrode terminal electrically connected to the second electrode plate;
The short circuit member,
A first shorting member provided on the first electrode terminal side; And
And a second shorting member provided on the second electrode terminal side.
The short circuit plate,
A round portion formed convexly toward the electrode assembly; And
A secondary battery comprising a reverse plate including an edge portion fixed to the cap plate.
And a top insulating member disposed between the connection plate and the cap plate and having an opening corresponding to the shorting hole.
And the shorting plate is in surface contact with the connection plate when the internal pressure of the secondary battery is greater than a set pressure.
Secondary battery, characterized in that the surface of the connection plate in contact with the short-circuit plate has a concave shape.
Secondary battery, characterized in that the surface of the short-circuit plate in contact with the connecting plate has a flat shape.
And at least one fuse unit provided on a current path of the secondary battery.
An electrode assembly comprising a first electrode plate and a second electrode plate;
A first electrode terminal electrically connected to the first electrode plate, a second electrode terminal electrically connected to the second electrode plate, a first short circuit hole and a second short circuit hole to seal the opening of the case; A cap assembly including a cap plate electrically insulated from the first electrode terminal and the second electrode terminal;
A first shorting plate installed in the first shorting hole, and a first connection plate installed to cover at least a portion of the first shorting hole on an outer side of the cap plate and electrically connected to the first electrode terminal; A first shorting member;
A second shorting plate installed in the second shorting hole, and a second connection plate installed to cover at least a portion of the second shorting hole on an outer side of the cap plate and electrically connected to the second electrode terminal; A second shorting member,
The case and the cap plate are insulated from the electrode assembly to maintain an electrically neutral state. When the internal pressure of the case is greater than a set pressure, the first shorting plate contacts the first connection plate, and the second shorting circuit. And a plate in contact with the second connection plate such that the first electrode terminal and the second electrode terminal are short-circuited through the case and the cap plate.
The first shorting plate and the second shorting plate,
A secondary battery comprising an edge portion fixed to the cap plate.
A first upper insulating member disposed between the first connecting plate and the cap plate and having an opening corresponding to the first shorting hole; And
And a second upper insulating member disposed between the second connecting plate and the cap plate and having an opening corresponding to the second shorting hole.
And the first shorting plate and the second shorting plate are in surface contact with the first connecting plate and the second connecting plate, respectively, when an internal pressure of the secondary battery is greater than a set pressure.
KR1020110073880A 2011-07-26 2011-07-26 Rechargeable battery KR101274806B1 (en)
KR1020110073880A KR101274806B1 (en) 2011-07-26 2011-07-26 Rechargeable battery
US13/333,869 US9012050B2 (en) 2011-07-26 2011-12-21 Rechargeable battery
KR20130012627A KR20130012627A (en) 2013-02-05
KR101274806B1 true KR101274806B1 (en) 2013-06-13
ID=47597453
US (1) US9012050B2 (en)
KR (1) KR101274806B1 (en)
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