Secondary battery

Abstract

The present invention relates to a secondary battery charged and discharged through the oxidation and reduction of metal ions dissolved in an electrolyte. The secondary battery according to an embodiment of the present invention comprises: a first liquid electrode in which a first half reaction occurs; a second liquid electrode in which a second half reaction occurs; a first frame that forms a first electrode receiving part which is a space for storing the first liquid electrode; a second frame that forms a second electrode receiving part which is a space for storing the second liquid electrode; a separator disposed between the first electrode receiving part and the second electrode receiving part; and an electrode connection part connecting the first electrode receiving part and the second electrode receiving part.

Description

secondary batteries

[0001] The present invention relates to a secondary battery, and more specifically, to a secondary battery in which metal ions dissolved in an electrolyte are oxidized and reduced to charge and discharge.

[0002] Redox Flow Battery (RFB) is an electrochemical storage device that stores electrical energy as chemical energy of electrolyte, unlike conventional secondary batteries, in which the active material in the electrolyte is oxidized and reduced to charge and discharge. Redox flow battery operates by continuously circulating the electrolyte inside the stack using a fluid pump, with the actual electrochemical reaction occurring in the stack. While these redox flow batteries have the advantages of long life, high output, and high capacity, they have suffered from space constraints and design difficulties due to the tank that stores the electrolyte and the fluid pump that circulates the electrolyte. Therefore, the inventors of the present invention developed a redox secondary battery that eliminates the electrolyte tank and fluid pump, but there was a problem that the performance and lifespan of the secondary battery were reduced due to an imbalance of the electrolyte caused by the crossover phenomenon in which metal ions and water pass through the separator during charging and discharging.

[0003] The problem to be solved by the present invention is to provide a secondary battery that resolves the imbalance of the liquid electrode caused by crossover.

[0004] The tasks of the present invention are not limited to the tasks mentioned above, and other tasks not mentioned will be clearly understood by those skilled in the art from the description below.

[0005] In order to achieve the above object, a secondary battery according to an embodiment of the present invention includes: a first liquid electrode in which a first half-reaction occurs; a second liquid electrode in which a second half-reaction occurs; a first frame forming a first electrode receiving portion, which is a space in which the first liquid electrode is stored; a second frame forming a second electrode receiving portion, which is a space in which the second liquid electrode is stored; a separator disposed between the first electrode receiving portion and the second electrode receiving portion; and an electrode connection portion connecting the first electrode receiving portion and the second electrode receiving portion.

[0006] In order to achieve the above object, a secondary battery according to an embodiment of the present invention includes: a first liquid electrode where a first half-reaction occurs; a second liquid electrode where a second half-reaction occurs; a separator disposed between the first liquid electrode and the second liquid electrode; a first frame and a second frame that interlock the separator and support the separator; and an electrode connection portion through which the first liquid electrode and / or the second liquid electrode flows.

[0007] In order to achieve the above object, a secondary battery according to an embodiment of the present invention includes: a first current collector; a second current collector spaced apart from the first current collector; a separator disposed between the first current collector and the second current collector; a first frame disposed between the first current collector and the separator to form a first electrode receiving portion; a second frame disposed between the second current collector and the separator to form a second electrode receiving portion; and an electrode connection portion connecting the first electrode receiving portion and the second electrode receiving portion.

[0008] Specific details of other embodiments are included in the detailed description and drawings.

[0009] According to the secondary battery of the present invention, one or more of the following effects are present.

[0010] First, there is an advantage in that the electrode connection is implemented on a two-sided frame, which allows for fixation of the separator while maximizing the reaction area.

[0011] Second, when the electrode connection is opened toward the separator, there is an advantage in that the liquid electrode flowing through the electrode connection can be prevented from coming into contact with the current collector and causing a short circuit.

[0012] Third, it also has the advantage of minimizing the strength imbalance of the frame caused by the electrode connection.

[0013] The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

[0014] Figure 1 is an exploded perspective view of a secondary battery according to one embodiment of the present invention.

[0015] Figure 2 is a perspective view of a secondary battery according to one embodiment of the present invention.

[0016] Figure 3 is a 3-3 cross-sectional view of the secondary battery illustrated in Figure 2.

[0017] Figure 4 is a perspective view of a secondary battery module according to one embodiment of the present invention.

[0018] Figure 5 is an exploded perspective view of a portion of a secondary battery according to one embodiment of the present invention.

[0019] Figure 6 is a perspective view of a portion of a secondary battery according to one embodiment of the present invention.

[0020] Figure 7 is a transparent plan view of a first frame of a secondary battery according to one embodiment of the present invention.

[0021] Figure 8 is a bottom view of a first frame of a secondary battery according to one embodiment of the present invention.

[0022] Figure 9 is a plan view of a second frame of a secondary battery according to one embodiment of the present invention.

[0023] Fig. 10 is a 10-10 cross-sectional view of a portion of the secondary battery illustrated in Fig. 6.

[0024] Fig. 11 is a cross-sectional view taken along the line 11-11 of a portion of the secondary battery illustrated in Fig. 6.

[0025] Figure 12 is an exploded perspective view of a portion of a secondary battery according to another embodiment of the present invention.

[0026] Figure 13 is a perspective view of a portion of a secondary battery according to another embodiment of the present invention.

[0027] FIG. 14 is a plan view of a second frame of a secondary battery according to another embodiment of the present invention.

[0028] FIG. 15 is a bottom view of a second frame of a secondary battery according to another embodiment of the present invention.

[0029] Fig. 16 is a cross-sectional view taken along the line 16-16 of a portion of the secondary battery illustrated in Fig. 13.

[0030] Figure 17 is an exploded perspective view of a portion of a secondary battery according to another embodiment of the present invention.

[0031] FIG. 18 is a perspective view of a portion of a secondary battery according to another embodiment of the present invention.

[0032] FIG. 19 is a plan view of a first frame of a secondary battery according to another embodiment of the present invention.

[0033] Figure 20 is a 20-20 cross-sectional view of a portion of the secondary battery illustrated in Figure 18.

[0034] Fig. 21 is a cross-sectional view taken along the line 21-21 of a portion of the secondary battery illustrated in Fig. 18.

[0035] The advantages and features of the present invention, and the methods for achieving them, will become clearer with reference to the embodiments described in detail below together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and may be implemented in various different forms. These embodiments are provided only to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. Like reference numerals designate like elements throughout the specification.

[0036] Although terms like "first" and "second" are used to describe various components, these components are not limited by these terms. These terms are used merely to distinguish one component from another, and unless otherwise specified, a "first" component may also be a "second" component.

[0037] Throughout the specification, unless otherwise specifically stated, each element may be singular or plural.

[0038] Hereinafter, the phrase "any configuration is placed on (or below)" a component or "on (or below)" a component may mean that any configuration is placed in contact with the upper surface (or lower surface) of said component, and that other configurations may be interposed between said component and any configuration placed on (or below) said component.

[0039] Additionally, when it is described that a component is "connected," "coupled," or "connected" to another component, it should be understood that the components may be directly connected or connected to one another, but that other components may also be "interposed" between the components, or that each component may be "connected," "coupled," or "connected" through another component.

[0040] As used herein, singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, terms such as "consisting of" or "comprising" should not necessarily be construed to include all of the components or steps described in the specification, and should be construed to mean that some of the components or steps may not be included, or that additional components or steps may be included.

[0041] Throughout the specification, when we refer to "A and / or B", this means A, B, or A and B, unless otherwise stated, and when we refer to "C to D", this means C or more and D or less, unless otherwise stated.

[0042] Hereinafter, the present invention will be described with reference to drawings for explaining a secondary battery according to embodiments of the present invention.

[0043] FIG. 1 is an exploded perspective view of a secondary battery according to one embodiment of the present invention, FIG. 2 is a perspective view of a secondary battery according to one embodiment of the present invention, FIG. 3 is a 3-3 cross-sectional view of the secondary battery illustrated in FIG. 2, and FIG. 4 is a perspective view of a secondary battery module according to one embodiment of the present invention.

[0044] A secondary battery according to one embodiment of the present invention comprises a first current collector (130a), a second current collector (130b) spaced apart from the first current collector (130a), a first liquid electrode where a first half reaction occurs, a second liquid electrode, a first frame (110a) forming a first receiving portion (111a) which is a space where the first liquid electrode is stored, a second frame (110b) forming a second electrode receiving portion (111b) which is a space where the second liquid electrode is stored, a separator (120) disposed between the first electrode receiving portion (111a) and the second electrode receiving portion (111b), a first solid electrode (150a) disposed in the first electrode receiving portion (111a) and impregnated with the first liquid electrode, and a first electrode receiving portion (111b) formed in the second electrode receiving portion (111b). It includes a second solid electrode (150b) that is arranged and impregnated with a second liquid electrode, a first current collector adhesive member (160a) that combines a first current collector (130a) and a first frame (110a), a second current collector adhesive member (160b) that combines a second current collector (130b) and a second frame (110b), a first separator adhesive member (140a) that combines a separator (120) and the first frame (110a), and a second separator adhesive member (140b) that combines a separator (120) and the second frame (110b).

[0045] The first liquid electrode is an electrolyte in which an anode redox couple is dissolved. The anode redox couple can be implemented with a material including at least one of vanadium (V), zinc (Zn), bromine (Br), chromium (Cr), manganese (Mn), titanium (Ti), iron (Fe), cerium (Ce), and cobalt (Co), and in this embodiment, V 2+ / V 3+ It is a redox couple. The first liquid electrode may be an acidic aqueous solution that conducts current through ionization, and preferably includes sulfuric acid. In the present embodiment, the first liquid electrode may be prepared by dissolving VOSO4 (vanadylsulfate) or V2O5 (vanadium pentoxide) in an H2SO4 aqueous solution.

[0046] The first liquid electrode causes the first half-reaction. The first half-reaction is as follows, where → indicates the direction of the discharge reaction and ← indicates the direction of the charge reaction.

[0047] V 2+ ←→ V 3+ + e -

[0048] During discharge, vanadium 2 ions are oxidized to vanadium 3 ions, and during charge, vanadium 3 ions are reduced to vanadium 2 ions.

[0049] The first liquid electrode is surrounded by a first frame (110a), a first current collector (130a), and a separator (120). The first liquid electrode is prevented from flowing out in an in-plane direction between the first current collector (130a) and the first frame (110a) by a first current collector adhesive member (160a). Hereinafter, the in-plane direction means a direction parallel to a plane formed by the separator (120). The first liquid electrode is accommodated in the first electrode receiving portion (111a). It is preferable that the first liquid electrode is impregnated in the first solid electrode (150a).

[0050] The first liquid electrode is electrically connected to the first current collector (130a), so that when discharging, electrons move to the first current collector (130a), and when charging, electrons of the first current collector (130a) move to the first liquid electrode. The first liquid electrode is in contact with the separator (120), so that hydrogen cations (protons) move through the separator (120).

[0051] The second liquid electrode is an electrolyte in which a cathode redox couple is dissolved. The cathode redox couple can be implemented with a material including at least one of vanadium (V), zinc (Zn), bromine (Br), chromium (Cr), manganese (Mn), titanium (Ti), iron (Fe), cerium (Ce), and cobalt (Co), and in this embodiment, V 4+ / V 5+It is a redox couple. The second liquid electrode may be an acidic aqueous solution that conducts current through ionization, and preferably includes sulfuric acid. In the present embodiment, the second liquid electrode may be manufactured by dissolving VOSO4 (vanadylsulfate) or V2O5 (vanadium pentoxide) in an H2SO4 aqueous solution.

[0052] The second liquid electrode causes the second half-reaction. The second half-reaction is as follows, where → indicates the direction of the discharge reaction and ← indicates the direction of the charge reaction.

[0053] V 5+ + e - ←→ V 4+

[0054] During discharge, vanadium pentavalent ions are reduced to vanadium tetravalent ions, and during charge, vanadium tetravalent ions are oxidized to vanadium pentavalent ions.

[0055] The second liquid electrode is surrounded by a second frame (110b), a second current collector (130b), and a separator (120). The second liquid electrode is prevented from flowing out in the in-plane direction or the like between the second current collector (130b) and the second frame (110b) by the second current collector adhesive member (160b). The second liquid electrode is accommodated in the second electrode receiving portion (111b). It is preferable that the second liquid electrode is impregnated in the second solid electrode (150b).

[0056] The second liquid electrode is electrically connected to the second current collector (130b), so that when charging, electrons move to the second current collector (130b), and when discharging, electrons of the second current collector (130b) move to the second liquid electrode. The second liquid electrode is in contact with the separator (120), so that hydrogen cations (protons) move through the separator (120).

[0057] As previously discussed, the first liquid electrode and the second liquid electrode are of the same composition. The first liquid electrode and the second liquid electrode contain vanadium ions in an electrolyte of the same composition. Hereinafter, the first liquid electrode and the second liquid electrode are collectively referred to as the liquid electrode.

[0058] The first frame (110a) is formed as a hollow rectangle. Depending on the embodiment, the first frame (110a) may be formed as a rhombus, circle, triangle, or polygon having a size greater than a pentagon. The first frame (110a) has a predetermined thickness in the out-of-plane direction to form the first electrode receiving portion (111a). Hereinafter, the out-of-plane direction means a direction penetrating the in-plane direction (a direction parallel to the plane formed by the separator (120). The out-of-plane direction includes the thickness direction (through-thickness direction, a direction perpendicular to the in-plane direction) of the first frame (110a), but does not mean only the direction perpendicular to the in-plane direction.

[0059] The first frame (110a) has a first current collector (130a) disposed on one side in the thickness direction and a separator (120) disposed on the other side. The hollow space of the first frame (110a) is closed by the first current collector (130a) and the separator (120). It is preferable that the first frame (110a) be disposed between the first current collector (130a) and the separator (120) to prevent the first liquid electrode from leaking in the in-plane direction, etc., and according to an embodiment, a part of the first frame (110a) may protrude outside the first current collector (130a). The first frame (110a) is coupled to the first current collector (130a) by the first current collector adhesive member (160a) and is coupled to the separator (120) by the first separator adhesive member (140a).

[0060] A first frame (110a) is disposed between a first current collector (130a) and a separator (120) to form a first electrode receiving portion (111a). The first frame (110a) accommodates a first liquid electrode. A first solid electrode (150a) is disposed inside the first frame (110a). A first current collector adhesive member (160a) is adhered to one edge in the thickness direction of the first frame (110a), and a first separator adhesive member (140a) is adhered to the other edge in the thickness direction of the first frame.

[0061] The second frame (110b) is formed as a hollow square. Depending on the embodiment, the second frame (110b) may be formed as a polygon larger than a rhombus, circle, triangle, or pentagon. The second frame (110b) has a predetermined thickness in the outward direction to form the second electrode receiving portion (111b).

[0062] The second frame (110b) has a second current collector (130b) disposed on one side in the thickness direction and a separator (120) disposed on the other side. The hollow space of the second frame (110b) is closed by the second current collector (130b) and the separator (120). It is preferable that the second frame (110b) be disposed between the second current collector (130b) and the separator (120) to prevent the second liquid electrode from leaking in the in-plane direction, etc., and according to an embodiment, a part of the second frame (110b) may protrude outside the second current collector (130b). The second frame (110b) is coupled to the second current collector (130b) by the second current collector adhesive member (160b) and to the separator (120) by the second separator adhesive member (140b).

[0063] The second frame (110b) is arranged between the second current collector (130b) and the separator (120) to form a second electrode receiving portion (111b). The second frame (110b) accommodates the second liquid electrode. The second frame (110b) has a second solid electrode (150b) arranged inside. The second frame (110b) has a second current collector adhesive member (160b) adhered to one edge in the thickness direction and a second separator adhesive member (140b) adhered to the other edge in the thickness direction.

[0064] The first frame (110a) and the second frame (110b) support the separator (120). The first frame (110a) and the second frame (110b) engage the edges of the separator (120) to secure the separator (120).

[0065] The separator (120) separates the first liquid electrode and the second liquid electrode and allows hydrogen cations (protons) to move between the first liquid electrode and the second liquid electrode. The separator (120) is arranged between the first frame (110a) and the second frame (110b) to separate the first electrode receiving portion (111a) and the second electrode receiving portion (111b).

[0066] A separator (120) is disposed between a first liquid electrode and a second liquid electrode. The separator (120) is disposed between a first current collector (130a) and a second current collector (130b). The edges of the separator (120) are engaged with the first frame (110a) and the second frame (110b). One edge of the separator (120) in the thickness direction is bonded to the first frame (110a) by a first separator adhesive member (140a), and the other edge is bonded to the second frame (110b) by a second separator adhesive member (140b). The first separator adhesive member (140a) is bonded to one edge in the thickness direction of the separator (120), and the second separator adhesive member (140b) is bonded to the other edge. The separator (120) is adhered to the first separator adhesive member (140a) adhered to the first frame (110a) and adhered to the second separator adhesive member (140b) adhered to the second frame (110b). The separator (120) is formed so that its edges match the edges of the first frame (110a) and the second frame.

[0067] Hydrogen cations move from the first liquid electrode to the second liquid electrode through the separator (120) during discharge, and move from the second liquid electrode to the first liquid electrode through the separator (120) during charge.

[0068] The separator (120) may include a perfluorinated ionomer, a partially fluorinated polymer, and non-fluorinated hydrocarbons. The separator (120) may be Nafion. ® , Flemion ® , NEOSEPTA-F ® or Gore Select ® may be formed of or contain.

[0069] The first current collector (130a) is arranged on one side of the first frame (110a) and forms a first electrode receiving portion (111a) together with the separator (120). The first current collector (130a) is arranged parallel to and spaced apart from the second current collector (130b). The first current collector (130a) is adhered to the first current collector adhesive member (160a) adhered to the first frame (110a). The first current collector (130a) is coupled to the first frame (110a) by the first current collector adhesive member (160a). The first current collector adhesive member (160a) is applied or adhered to the edge of the first current collector (130a). The first collector (130a) is electrically connected to the first liquid electrode, and electrons move to allow current to flow during charging and discharging.

[0070] When a plurality of secondary batteries form a module with a plurality of first frames (110a) and a plurality of second frames (110b), a plurality of separators (120), a plurality of first current collectors (130a) and a plurality of second current collectors (130b) as shown in FIG. 4, the plurality of first current collectors (130a) are electrically connected by a bus bar (not shown) to connect the plurality of secondary batteries in parallel or series.

[0071] The first current collector (130a) includes a first metal current collector (131a) formed of metal and electrically connected to a bus bar, and a first carbon current collector (132a) disposed between the first metal current collector (131a) and the first frame (110a).

[0072] The first carbon current collector (132a) is formed of a material such as graphite, carbon, or carbon plastic, and has high electrical conductivity and high acid resistance. The first carbon current collector (132a) is placed between the first liquid electrode and the first metal current collector (131a) to allow electrons to move between them, but prevent the first metal current collector (131a) from being oxidized. The first carbon current collector (132a) may be formed in a rectangular plate shape or may be formed by being applied to the first metal current collector (131a).

[0073] The first carbon collector (132a) is formed so that its edge matches the edge of the first frame (110a). The first carbon collector (132a) is bonded to the first frame (110a) by a first collector adhesive member (160a). The first carbon collector (132a) has the first collector adhesive member (160a) applied or adhered to its edge.

[0074] The first metal current collector (131a) is formed of a metal with high electrical conductivity, such as copper or aluminum. The first metal current collector (131a) is formed in a rectangular plate shape, and a portion thereof protrudes to be connected to a bus bar.

[0075] The first metal current collector (131a) may be formed as a flexible thin film or as a rigid plate. When a plurality of secondary batteries form a module as shown in FIG. 4, the plurality of first metal current collectors (131a) may be formed as a flexible thin film, but only some may be formed as a rigid plate.

[0076] The first metal collector (131a) has a first carbon collector (132a) arranged on one side. When a plurality of secondary batteries form a module as shown in Fig. 4, the first metal collector (131a) has a first carbon collector (132a) arranged on both sides.

[0077] The second current collector (130b) is arranged on one side of the second frame (110b) to form a second electrode receiving portion (111b) together with the second frame (110b) and the separator (120). The second current collector (130b) is arranged parallel to and spaced apart from the first current collector (130a). The second current collector (130b) is adhered to a second current collector adhesive member (160b) adhered to the second frame (110b). The second current collector (130b) is coupled to the second frame (110b) by the second current collector adhesive member (160b). The second current collector (130b) has the second current collector adhesive member (160b) applied or adhered to an edge thereof. The second collector (130b) is electrically connected to the second liquid electrode, and electrons move to allow current to flow during charging and discharging.

[0078] When a plurality of secondary batteries form a module with a first frame (110a) and a plurality of second frames (110b), a plurality of separators (120), a plurality of first current collectors (130a) and a plurality of second current collectors (130b) as shown in FIG. 4, the plurality of second current collectors (130b) are electrically connected by a bus bar (not shown) to connect the plurality of secondary batteries in parallel or series.

[0079] The second current collector (130b) includes a second metal current collector (131b) formed of metal and electrically connected to the bus bar, and a second carbon current collector (132b) disposed between the second metal current collector (131b) and the second frame (110b).

[0080] The second carbon current collector (132b) is formed of a material such as graphite, carbon, or carbon plastic, and has high electrical conductivity and high acid resistance. The second carbon current collector (132b) is placed between the second liquid electrode and the second metal current collector (131b) to allow electrons to move between each other, but prevent the second metal current collector (131b) from being oxidized. The second carbon current collector (132b) may be formed in a rectangular plate shape or may be formed by being applied to the second metal current collector (131b).

[0081] The second carbon collector (132b) is formed so that its edge matches the edge of the second frame (110b). The second carbon collector (132b) is joined to the second frame (110b) by a second collector adhesive member (160b). The second carbon collector (132b) has the second collector adhesive member (160b) applied or adhered to its edge.

[0082] The second metal current collector (131b) is formed of a metal with high electrical conductivity, such as copper or aluminum. The second metal current collector (131b) is formed in a rectangular plate shape, and a portion thereof protrudes to be connected to the bus bar.

[0083] The second metal current collector (131b) may be formed as a flexible thin film or as a rigid plate. When a plurality of secondary batteries form a module as shown in Fig. 4, the plurality of second metal current collectors (131b) may be formed as a flexible thin film, but only some may be formed as a rigid plate.

[0084] The second metal collector (131b) has a second carbon collector (132b) arranged on one side. When a plurality of secondary batteries form a module as shown in Fig. 4, the second metal collector (131b) has a second carbon collector (132b) arranged on both sides.

[0085] The first solid electrode (150a) is impregnated with the first liquid electrode and is placed in the first electrode receiving portion (111a). The first solid electrode (150a) is placed surrounded by the first frame (110a), the first current collector (130a), and the separator (120). The first solid electrode (150a) includes carbon-based materials such as carbon or graphite felt, carbon cloth, carbon black, graphite powder, or graphene. The first solid electrode (150a) is placed on the inner side of the first current collector adhesive member (160a) in the in-plane direction in the first frame (110a).

[0086] The first solid electrode (150a) may be formed in a porous hexahedral shape. The first solid electrode (150a) may have a thickness greater than that of the first electrode receiving portion (111a), in which case it may be compressed and received in the first electrode receiving portion (111a). The first solid electrode (150a) is in close contact with the first current collector (130a) and the separator (120).

[0087] The second solid electrode (150b) is impregnated with the second liquid electrode and is placed in the second electrode receiving portion (111b). The second solid electrode (150b) is placed surrounded by a second frame (110b), a second current collector (130b), and a separator (120). The second solid electrode (150b) includes carbon-based materials such as carbon or graphite felt, carbon cloth, carbon black, graphite powder, or graphene. The second solid electrode (150b) is placed on the inner side of the second current collector adhesive member (160b) in the in-plane direction in the second frame (110b).

[0088] The second solid electrode (150b) may be formed in a porous hexahedral shape. The second solid electrode (150b) may have a thickness greater than that of the second electrode receiving portion (111b), in which case it may be compressed and received in the second electrode receiving portion (111b). The second solid electrode (150b) is in close contact with the second current collector (130b) and the separator (120).

[0089] Each of the first current collector adhesive member (160a), the second current collector adhesive member (160b), the first separator adhesive member (140a), and the second separator adhesive member (140b) includes at least one of an acrylate-based adhesive, an acrylate-ester-based adhesive, an acrylate-ethylene-based adhesive, a polycarbonate-based adhesive, a polyethylene-based adhesive, an epoxy-based adhesive, and an isocyanate-based adhesive. Each of the first current collector adhesive member (160a), the second current collector adhesive member (160b), the first separator adhesive member (140a), and the second separator adhesive member (140b) is one or a combination of a solvent-based adhesive, an emulsion-based adhesive, a hot melt-based adhesive, a liquid-curable adhesive, and a film-based adhesive.

[0090] Each of the first current collector adhesive member (160a), the second current collector adhesive member (160b), the first separator adhesive member (140a), and the second separator adhesive member (140b) may be formed in a band shape. Each of the first current collector adhesive member (160a), the second current collector adhesive member (160b), the first separator adhesive member (140a), and the second separator adhesive member (140b) may be formed in a hollow square shape. Each of the first current collector adhesive member (160a), the second current collector adhesive member (160b), the first separator adhesive member (140a), and the second separator adhesive member (140b) may be formed in a closed curve. The first current collector adhesive member (160a), the second current collector adhesive member (160b), the first separator adhesive member (140a), and the second separator adhesive member (140b) are formed so that their edges match the edges of the first frame (110a) and the second frame (110b).

[0091] The first current collector adhesive member (160a) connects the first carbon current collector (132a) of the first current collector (130a) and the first frame (110a). The first current collector adhesive member (160a) is laminated between the first carbon current collector (132a) of the first current collector (130a) and the first frame (110a). The first current collector adhesive member (160a) is adhered to one edge in the thickness direction of the first frame (110a). The first current collector adhesive member (160a) is adhered to the edge of the side on which the first metal current collector (131a) is not arranged among both sides of the first carbon current collector (132a). The first current collector adhesive member (160a) can be applied to the first carbon current collector (132a) and adhered to the first frame (110a).

[0092] The second current collector adhesive member (160b) connects the second carbon current collector (132b) of the second current collector (130b) and the second frame (110b). The second current collector adhesive member (160b) is laminated between the second carbon current collector (132b) of the second current collector (130b) and the second frame (110b). The second current collector adhesive member (160b) is adhered to the other edge in the thickness direction of the second frame (110b). The second current collector adhesive member (160b) is adhered to the edge of the side on which the second metal current collector (131b) is not arranged among both sides of the second carbon current collector (132b). The second current collector adhesive member (160b) can be applied to the second carbon current collector (132b) and adhered to the second frame (110b).

[0093] The first separator adhesive member (140a) connects the separator (120) and the first frame (110a). The first separator adhesive member (140a) is laminated between the separator (120) and the first frame (110a). The first separator adhesive member (140a) is adhered to the other edge in the thickness direction of the first frame (110a). The first separator adhesive member (140a) is adhered to one edge in the thickness direction of the separator (120). The first separator adhesive member (140a) can be applied to the first frame (110a) and adhered to the separator (120).

[0094] The second separator adhesive member (140b) connects the separator (120) and the second frame (110b). The second separator adhesive member (140b) is laminated between the separator (120) and the second frame (110b). The second separator adhesive member (140b) is adhered to the other edge in the thickness direction of the second frame (110b). The second separator adhesive member (140b) is adhered to the other edge in the thickness direction of the separator (120). The second separator adhesive member (140b) can be applied to the second frame (110b) and adhered to the separator (120).

[0095] The overall configuration of the secondary battery according to the present invention configured as described above is as follows.

[0096] A separator (120) is bonded between the first frame (110a) and the second frame (110b) in the thickness direction of a square having a predetermined thickness by a first separator adhesive member (140a) and a second separator adhesive member (140b). That is, the separator (120) is bonded so that its edges are interlocked between the first frame (110a) and the second frame (110b).

[0097] A first current collector (130a) is bonded to one side in the thickness direction of the first frame (110a) by a first current collector adhesive member (160a), and a second current collector (130b) is bonded to the other side in the thickness direction of the second frame (110b) by a second current collector adhesive member (160b), thereby forming a first electrode receiving portion (111a) and a second electrode receiving portion (111b). That is, the first frame (110a), the separator (120), and the second frame (110b) are arranged between the first current collector (130a) and the second current collector (130b).

[0098] A first solid electrode (150a) impregnated with a first liquid electrode is placed in the first electrode receiving portion (111a), and a second solid electrode (150b) impregnated with a second liquid electrode is placed in the second electrode receiving portion (111b).

[0099] The first current collector adhesive member (160a) and the first separator adhesive member (140a) are respectively adhered to one side in the thickness direction and the other side in the thickness direction of the first frame (110a) and adhered to the edges of the first carbon current collector (132a) and the separator (120).

[0100] The second current collector adhesive member (160b) and the second separator adhesive member (140b) are respectively adhered to one side in the thickness direction and the other side in the thickness direction of the second frame (110b) and adhered to the edges of the second carbon current collector (132b) and the separator (120).

[0101] The first frame (110a), the second frame (110b), the separator (120), the first carbon collector (132a) and the second carbon collector (132b) are arranged so that their edges coincide with each other, and when joined together, they form a rectangular parallelepiped shape.

[0102] Referring to FIG. 4, the above-described configuration is repeated in an alternating manner to form a module. That is, the first current collector (130a) may be placed between a pair of first frames (110a) to which a separator (120) is coupled, and the second current collector (130b) may be placed between a pair of second frames (110b) to which a separator (120) is coupled. In this case, only one first metal current collector (131a) may be placed between two first carbon current collectors (132a), and only one second metal current collector (131b) may be placed between two second carbon current collectors (132b).

[0103] FIG. 5 is an exploded perspective view of a portion of a secondary battery according to an embodiment of the present invention, FIG. 6 is a perspective view of a portion of a secondary battery according to an embodiment of the present invention, FIG. 7 is a transparent plan view of a first frame of a secondary battery according to an embodiment of the present invention, FIG. 8 is a bottom view of a first frame of a secondary battery according to an embodiment of the present invention, FIG. 9 is a plan view of a second frame of a secondary battery according to an embodiment of the present invention, FIG. 10 is a 10-10 cross-sectional view of a portion of the secondary battery illustrated in FIG. 6, and FIG. 11 is a 11-11 cross-sectional view of a portion of the secondary battery illustrated in FIG. 6.

[0104] A secondary battery according to one embodiment of the present invention includes an electrode connection portion (112a, 112b) connecting a first electrode receiving portion (111a) and a second electrode receiving portion (111b), and an electrode injection portion (114) formed on a first frame (110a) or a second frame (110b) and connected to the electrode connection portion (112a, 112b), into which a first liquid electrode and / or a second liquid electrode are injected.

[0105] The electrode connection portion (112a, 112b) is where the first liquid electrode and / or the second liquid electrode flows. The separator (120) should prevent the first liquid electrode and the second liquid electrode from mixing with each other. However, a crossover phenomenon may occur in which vanadium ions and water contained in the first liquid electrode and the second liquid electrode pass through the separator (120) during charging or discharging. Accordingly, an imbalance occurs in the amount of the first liquid electrode and the amount of the second liquid electrode, which affects the performance and lifespan of the secondary battery. In the case of a conventional redox flow secondary battery having a liquid electrode tank and a pump, the imbalance of the liquid electrodes within the stack can be resolved. However, in the case of the present invention, in which the liquid electrode exists only within the secondary battery, even a small imbalance affects the performance and lifespan of the secondary battery. The electrode connection portion (112a, 112b) resolves the imbalance caused by this crossover, and the first liquid electrode or the second liquid electrode with increased volume is temporarily stored in the electrode connection portion (112a, 112b) or moves to the second liquid electrode or the first liquid electrode with reduced volume through the electrode connection portion (112a, 112b).

[0106] The electrode connection portion (112a, 112b) connects the first electrode receiving portion (111a) and the second electrode receiving portion (111b) so that the imbalance between the amount of the first liquid electrode and the amount of the second liquid electrode due to crossover occurring during charging or discharging is resolved, and the first liquid electrode or the second liquid electrode flows inside during charging or discharging.

[0107] It is preferable that the electrode connection portion (112a, 112b) be formed thin and long so as to have a resistance value of a certain level or higher while having a volume larger than the amount of the first liquid electrode or the amount of the second liquid electrode that moves to the separator (120) due to crossover.

[0108] The electrode connection portions (112a, 112b) penetrate the first separator adhesive member (140a), the separator (120), and the second separator adhesive member (140b). The electrode connection portions (112a, 112b) must penetrate the plane formed by the separator (120) because they must connect the first electrode receiving portion (111a) formed in the first frame (110a) and the second electrode receiving portion (111b) formed in the second frame (110b). Accordingly, the electrode connection portions (112a, 112b) penetrate the separator (120) as shown in FIG. 11, and can also penetrate the first separator adhesive member (140a) and the second separator adhesive member (140b).

[0109] Referring to FIGS. 5 and 11, the separator (120) is formed with a separator hole (121) that constitutes a part of the electrode-to-electrode connection portion (112a, 112b). In addition, the first separator adhesive member (140a) is formed with a first separator adhesive member hole (1401a) that constitutes a part of the electrode-to-electrode connection portion (112a, 112b), and the second separator adhesive member (140b) is formed with a second separator adhesive member hole (1401b) that constitutes a part of the electrode-to-electrode connection portion (112a, 112b). The first separator adhesive member hole (1401a), the separator hole (121), and the second separator adhesive member hole (1401b) are holes formed in the thickness direction and constitute a part of the electrode connection portion (112a, 112b) and are arranged between the first frame (110a) and the second frame (110b). The first separator adhesive member hole (1401a), the separator hole (121), and the second separator adhesive member hole (1401b) are arranged on the same line in the thickness direction.

[0110] According to an embodiment, the first separator adhesive member hole (1401a), the separator hole (121), and the second separator adhesive member hole (1401b) may be in the form of a chamfer with the corners removed, rather than a hole, or a portion (a portion where the first electrode connection terminal (1121a) and the second electrode connection terminal (1121b) are connected, which will be described later) is removed. According to an embodiment, when the first separator adhesive member (140a) is applied to the first frame (110a), it may not be applied to the portion where the electrode connection portions (112a, 112b) of the first frame (110a) are formed (the portion where the first electrode connection portion (112a) to be described later is formed), and when the second separator adhesive member (140b) is applied to the second frame (110b), it may not be applied to the portion where the electrode connection portions (112a, 112b) of the second frame (110b) are formed (the portion where the second electrode connection portion (112b) to be described later is formed).

[0111] The electrode connection portion (112a, 112b) includes a first electrode connection portion (112a) formed on a first frame (110a) and connected to a first electrode receiving portion (111a), and a second electrode connection portion (112b) formed on a second frame (110b) and connected to a second electrode receiving portion (111b) and the first electrode connection portion (112a).

[0112] Referring to FIGS. 8 and 10, the first electrode connection portion (112a) is formed in the in-plane direction on the first frame (110a) and is formed as a groove that is opened toward the separator (120). The first electrode connection portion (112a) is formed by the first separator adhesive member (140a) and the first frame (110a). In some embodiments, when the first separator adhesive member (140a) is applied to the first frame (110a), it may not be applied to the portion where the first electrode connection portion (112a) is formed. In this case, the first electrode connection portion (112a) may be formed by the separator (120) and the first frame (110a).

[0113] The first electrode connection portion (112a) is formed on one side of the first frame (110a) in the thickness direction, and in this embodiment, is formed on the side facing the separator (120). The first electrode connection portion (112a) is formed long in the in-plane direction and is formed on at least two sides of the first frame (110a) which is rectangular by being bent at least once. In this embodiment, the first electrode connection portion (112a) is formed on four sides of the first frame (110a) by being bent three times. The bent portion of the first electrode connection portion (112a) is connected to the electrode injection portion (114).

[0114] The first electrode connection portion (112a) is formed with a first electrode connection terminal (1121a) at one end and a first electrode connection drain (1129a) at the other end.

[0115] The first electrode connection (1121a) is a portion connected to the second electrode connection portion (112b). The first electrode connection (1121a) is formed as a groove that is opened toward the separator (120). The first electrode connection (1121a) is formed near one corner of the first frame (110a). The first electrode connection (1121a) is arranged on the same line in the thickness direction as the separator hole (121) and the second electrode connection (1121b) to be described later. The first electrode connection (1121a) is arranged on the same line in the thickness direction as the first separator adhesive member hole (1401a) and the second separator adhesive member hole (1401b).

[0116] The first electrode connection drain (1129a) is a portion connected to the first electrode receiving portion (111a). The first electrode connection drain (1129a) is formed as a groove that is opened toward the separator (120). The first electrode connection drain (1129a) is formed near one corner of the first frame (110a), and in the present embodiment, it is formed near the corner where the first electrode connection terminal (1121a) is formed.

[0117] Referring to FIGS. 9 and 11, the second electrode connection portion (112b) is formed in the in-plane direction on the second frame (110b) and is formed as a groove that is opened toward the separator (120). The second electrode connection portion (112b) is formed by the second separator adhesive member (140b) and the second frame (110b). In some embodiments, when the second separator adhesive member (140b) is applied to the second frame (110b), it may not be applied to the portion where the second electrode connection portion (112b) is formed. In this case, the second electrode connection portion (112b) may be formed by the separator (120) and the first frame (110a).

[0118] The second electrode connection portion (112b) is formed on one side of the second frame (110b) in the thickness direction, and in this embodiment, is formed on the side facing the separator (120). The second electrode connection portion (112b) is formed short. In this embodiment, the second electrode connection portion (112b) is formed near one corner of the second frame (110b).

[0119] The second electrode connection portion (112b) is formed with a second electrode connection terminal (1121b) at one end and a second electrode connection drain (1129b) at the other end.

[0120] The second electrode connection (1121b) is a portion connected to the first electrode connection portion (112a). The second electrode connection (1121b) is formed as a groove that is opened toward the separator (120). The second electrode connection (1121b) is formed near one corner of the second frame (110b). The second electrode connection (1121b) is arranged on the same line in the thickness direction as the separator hole (121) and the first electrode connection (1121a). The second electrode connection (1121b) is arranged on the same line in the thickness direction as the first separator adhesive member hole (1401a) and the second separator adhesive member hole (1401b).

[0121] The second electrode connection drain (1129b) is a portion connected to the second electrode receiving portion (111b). The second electrode connection drain (1129b) is formed as a groove that is opened toward the separator (120). The second electrode connection drain (1129b) is formed near one corner of the second frame (110b), and in the present embodiment, it is formed near the corner where the second electrode connection terminal (1121b) is formed.

[0122] Referring to Fig. 11, the first electrode connection portion (112a) formed in the first frame (110a) and the second electrode connection portion (112b) formed in the second frame (110b) are connected by a separator hole (121), a first separator adhesive member hole (1401a), and a second separator adhesive member hole (1401b). Based on the thickness direction, the first electrode connection portion (1121a), the first separator adhesive member hole (1401a), the separator hole (121), the second separator adhesive member hole (1401b), and the second electrode connection portion (1121b) are sequentially connected.

[0123] The electrode injection portion (114) is formed in the first frame (110a) or the second frame (110b) so that a liquid electrode is injected from the outside and flows into the first electrode receiving portion (111a) and the second electrode receiving portion (111b). The electrode injection portion (114) is formed so that one end is opened to the outside in the first frame (110a) or the second frame (110b), and is closed after the first liquid electrode and / or the second liquid electrode is injected. The electrode injection portion (114) is formed so that the first liquid electrode is injected into the first electrode receiving portion (111a) and the second liquid electrode is injected into the second electrode receiving portion (111b). When a liquid electrode is injected from the outside through the electrode injection portion (114), it is received in the first electrode receiving portion (111a) and the second electrode receiving portion (111b). The liquid electrode injected into the first electrode receiving portion (111a) through the electrode injection portion (114) becomes the first liquid electrode, and the liquid electrode injected into the second electrode receiving portion (111b) through the electrode injection portion (114) becomes the second liquid electrode.

[0124] In this embodiment, the electrode injection portion (114) is connected to the first electrode connection portion (112a) of the first frame (110a). The electrode injection portion (114) is connected to the first electrode receiving portion (111a) and the second electrode receiving portion (111b) by the electrode connection portions (112a, 112b).

[0125] FIG. 12 is an exploded perspective view of a portion of a secondary battery according to another embodiment of the present invention, FIG. 13 is a perspective view of a portion of a secondary battery according to another embodiment of the present invention, FIG. 14 is a plan view of a second frame of a secondary battery according to another embodiment of the present invention, FIG. 15 is a bottom view of a second frame of a secondary battery according to another embodiment of the present invention, and FIG. 16 is a cross-sectional view taken along line 16-16 of a portion of the secondary battery illustrated in FIG. 13.

[0126] A secondary battery according to another embodiment of the present invention differs from a secondary battery according to one embodiment of the present invention only in the second electrode connection portion (212b) of the second frame (210b), and the remaining components are the same, so a description thereof is omitted.

[0127] According to another embodiment of the present invention, a second electrode connection portion (212b) is formed in the in-plane direction on the second frame (210b), and a portion thereof is formed as a groove that is opened toward the second current collector (130b). The second electrode connection portion (212b) is formed by the second current collector adhesive member (160b) and the second frame (110b).

[0128] The second electrode connection portion (112b) is formed on one side of the second frame (110b) in the thickness direction, and in this embodiment, a portion of it is formed on the side facing the second current collector (130b). The second electrode connection portion (212b) is formed short. In this embodiment, the second electrode connection portion (212b) is formed near one corner of the second frame (210b).

[0129] The second electrode connection portion (212b) is formed with a second electrode connection hole (2121b) at one end and a second electrode connection drain (2129b) at the other end. The second electrode connection hole (2121b) is a portion connected to the first electrode connection portion (112a). The second electrode connection hole (2121b) is formed as a hole penetrating in the thickness direction of the second frame (210b). The second electrode connection hole (2121b) is formed near one corner of the second frame (110b). The second electrode connection hole (2121b) is arranged on the same line in the thickness direction as the separator hole (121) and the first electrode connection end (1121a). The second electrode connection hole (2121b) is arranged on the same line in the thickness direction as the first separator adhesive member hole (1401a) and the second separator adhesive member hole (1401b).

[0130] The second electrode connection drain (2129b) is a portion connected to the second electrode receiving portion (111b). The second electrode connection drain (2129b) is formed as a groove that is opened toward the second current collector (130b). The second electrode connection hole (2121b) is formed near one corner of the second frame (110b), and in the present embodiment, it is formed near the corner where the second electrode connection drain (2129b) is formed.

[0131] Referring to Fig. 16, the first electrode connection portion (112a) formed in the first frame (110a) and the second electrode connection portion (212b) formed in the second frame (210b) are connected by a separator hole (121), a first separator adhesive member hole (1401a), and a second separator adhesive member hole (1401b). Based on the thickness direction, the first electrode connection portion (1121a), the first separator adhesive member hole (1401a), the separator hole (121), the second separator adhesive member hole (1401b), and the second electrode connection hole (2121b) are sequentially connected.

[0132] FIG. 17 is an exploded perspective view of a portion of a secondary battery according to another embodiment of the present invention, FIG. 18 is a perspective view of a portion of a secondary battery according to another embodiment of the present invention, FIG. 19 is a plan view of a first frame of a secondary battery according to another embodiment of the present invention, FIG. 20 is a cross-sectional view taken along line 20-20 of a portion of the secondary battery illustrated in FIG. 18, and FIG. 21 is a cross-sectional view taken along line 21-21 of a portion of the secondary battery illustrated in FIG. 18.

[0133] A secondary battery according to another embodiment of the present invention differs from a secondary battery according to another embodiment of the present invention only in the first electrode connection portion (312b) of the first frame (310b), and the remaining components are the same, so a description thereof is omitted.

[0134] According to another embodiment of the present invention, a first electrode connection portion (312a) is formed in the in-plane direction on the first frame (110a), and a portion thereof is formed as a groove that is opened toward the first current collector (130a). The first electrode connection portion (312a) is formed by the first current collector adhesive member (160a) and the first frame (110a).

[0135] The first electrode connection portion (312a) is formed on one side of the first frame (310a) in the thickness direction, and in this embodiment, a portion thereof is formed on the side facing the first current collector (130a). The first electrode connection portion (312a) is formed long in the in-plane direction and is formed on at least two sides of the first frame (310a) having a rectangular shape by being bent at least once. In this embodiment, the first electrode connection portion (312a) is formed on four sides of the first frame (310a) by being bent three times. The bent portion of the first electrode connection portion (312a) is connected to the electrode injection portion (114).

[0136] The first electrode connection portion (312a) is formed with a first electrode connection hole (3121a) at one end and a first electrode connection drain (3129a) at the other end.

[0137] The first electrode connection hole (3121a) is a portion connected to the second electrode connection portion (212b). The first electrode connection hole (3121a) is formed as a hole penetrating in the thickness direction of the first frame (310a). The first electrode connection hole (3121a) is formed near one corner of the first frame (310a). The first electrode connection hole (3121a) is arranged on the same line in the thickness direction as the separator hole (121) and the second electrode connection hole (2121b). The first electrode connection hole (3121a) is arranged on the same line in the thickness direction as the first separator adhesive member hole (1401a) and the second separator adhesive member hole (1401b).

[0138] The first electrode connection drain (3129a) is a portion connected to the first electrode receiving portion (111a). The first electrode connection drain (3129a) is formed as a groove that is opened toward the first current collector (130a). The first electrode connection drain (3129a) is formed near one corner of the first frame (310a), and in the present embodiment, it is formed near the corner where the first electrode connection hole (3121a) is formed.

[0139] Referring to Fig. 21, the first electrode connection portion (312a) formed in the first frame (310a) and the second electrode connection portion (212b) formed in the second frame (210b) are connected by a separator hole (121), a first separator adhesive member hole (1401a), and a second separator adhesive member hole (1401b). Based on the thickness direction, the first electrode connection hole (3121a), the first separator adhesive member hole (1401a), the separator hole (121), the second separator adhesive member hole (1401b), and the second electrode connection hole (2121b) are sequentially connected.

[0140] Although the preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the specific embodiments described above, and various modifications may be made by a person skilled in the art to which the invention pertains without departing from the gist of the present invention as claimed in the claims. Furthermore, such modifications should not be understood individually from the technical idea or prospect of the present invention.

Claims

1. A first liquid electrode where the first half-reaction occurs; A second liquid electrode where the second half-reaction occurs; A first frame forming a first electrode receiving portion, which is a space in which the first liquid electrode is stored; A second frame forming a second electrode receiving portion, which is a space in which the second liquid electrode is stored; A separator disposed between the first electrode receiving portion and the second electrode receiving portion; and A secondary battery including an electrode connection portion connecting the first electrode receiving portion and the second electrode receiving portion.

2. In paragraph 1, The above electrode connection part is, A first electrode connection portion formed on the first frame and connected to the first electrode receiving portion; and A secondary battery including a second electrode connection portion formed on the second frame and connected to the second electrode receiving portion and the first electrode connection portion.

3. In paragraph 2, Further comprising a first separator adhesive member that combines the separator and the first frame, A secondary battery wherein at least a portion of the first electrode connection portion is formed by the first separator adhesive member and the first frame.

4. In paragraph 2, A secondary battery in which the first electrode connection portion is formed as a groove at least partially open toward the separator.

5. In paragraph 2, A first current collector arranged on one side of the first frame to form the first electrode receiving portion; Further comprising a first collector adhesive member that combines the first collector and the first frame, A secondary battery wherein at least a portion of the first electrode connection portion is formed by the first frame and the first current collector adhesive member.

6. In paragraph 2, Further comprising a first current collector disposed on one side of the first frame to form the first electrode receiving portion, A secondary battery in which at least a portion of the first electrode connection portion is formed as a groove that is opened toward the first current collector.

7. In paragraph 2, A secondary battery in which the first electrode connection portion is formed with a first electrode connection hole that penetrates in the thickness direction of the first frame.

8. In paragraph 2, Further comprising a second separator adhesive member that combines the separator and the second frame, A secondary battery wherein at least a portion of the second electrode connection portion is formed by the second separator adhesive member and the second frame.

9. In paragraph 2, A secondary battery in which the second electrode connection portion is formed as a groove at least partially open toward the separator.

10. In paragraph 2, A second current collector arranged on one side of the second frame to form the second electrode receiving portion; Further comprising a second collector adhesive member that combines the above collector and the second frame, A secondary battery wherein at least a portion of the second electrode connection portion is formed by the second frame and the second current collector adhesive member.

11. In paragraph 2, Further comprising a second current collector disposed on one side of the second frame to form the second electrode receiving portion, A secondary battery in which at least a portion of the second electrode connection portion is formed as a groove that is opened toward the second current collector.

12. In paragraph 2, A secondary battery in which the second electrode connection portion is formed with a second electrode connection hole that penetrates in the thickness direction of the second frame.

13. In paragraph 1, The above separator is arranged with an edge between the first frame and the second frame, A secondary battery in which the above electrode connection portion penetrates the separator.

14. In paragraph 1, The above separator is arranged with an edge between the first frame and the second frame, A secondary battery in which the above separator has a separator hole formed as a part of the electrode connection portion.

15. In paragraph 1, Further comprising a first separator adhesive member that combines the first frame and the separator, A secondary battery in which the above electrode connection portion penetrates the first separator adhesive member.

16. In paragraph 1, Further comprising a first separator adhesive member that combines the first frame and the separator, A secondary battery in which the first separator adhesive member has a first adhesive member hole formed therein, which constitutes a part of the electrode-to-electrode connection portion.

17. In paragraph 1, Further comprising a second separator adhesive member that combines the second frame and the separator, A secondary battery in which the above electrode connection portion penetrates the second separator adhesive member.

18. In paragraph 1, Further comprising a second separator adhesive member that combines the second frame and the separator, A secondary battery in which the second separator adhesive member has a second adhesive member hole formed therein, which constitutes a part of the electrode-to-electrode connection portion.

19. In paragraph 1, A secondary battery further comprising an electrode injection portion formed on the first frame or the second frame and connected to the electrode connection portion, into which the first liquid electrode and / or the second liquid electrode is injected.

20. In paragraph 19, A secondary battery in which the electrode injection portion is closed after the first liquid electrode and / or the second liquid electrode is injected.

21. First liquid electrode where the first half-reaction occurs; A second liquid electrode where the second half-reaction occurs; A separator disposed between the first liquid electrode and the second liquid electrode; A first frame and a second frame that interlock the separator and support the separator; and A secondary battery including an electrode connection portion through which the first liquid electrode and / or the second liquid electrode flows.

22. First House; A second collector disposed spaced apart from the first collector; A separator disposed between the first collector and the second collector; A first frame disposed between the first current collector and the separator to form a first electrode receiving portion; A second frame disposed between the second current collector and the separator to form a second electrode receiving portion; and A secondary battery including an electrode connection portion connecting the first electrode receiving portion and the second electrode receiving portion.

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