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 includes: a first liquid electrode in which a first half reaction occurs; a second liquid electrode in which a second half reaction occurs; a frame forming a first electrode receiving part, which is a space in which the first liquid electrode is stored, and a second electrode receiving part, which is a space in which the second liquid electrode is stored; a separator coupled to the frame and disposed between the first electrode receiving part and the second electrode receiving part; an electrode connection part configured to connect the first electrode receiving part and the second electrode receiving part; and an electrode injection part into which the first liquid electrode and / or the second liquid electrode are injected and which is not connected to the electrode connection 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 had problems due to space constraints and design difficulty 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 of having to properly inject the electrolyte into the stack.

[0003] The problem to be solved by the present invention is to provide a secondary battery capable of appropriately injecting a liquid electrode into an electrode receiving portion.

[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 frame forming a first electrode receiving portion which is a space in which the first liquid electrode is stored and a second electrode receiving portion which is a space in which the second liquid electrode is stored, a separator which is coupled to the frame and arranged between the first electrode receiving portion and the second electrode receiving portion, an electrode connection portion which connects the first electrode receiving portion and the second electrode receiving portion, and an electrode injection portion into which the first liquid electrode and / or the second liquid electrode is injected and which is not connected to the electrode connection 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 in which a first half-reaction occurs, a second liquid electrode in which a second half-reaction occurs, a separator disposed between the first liquid electrode and the second liquid electrode, a frame supporting the separator, an electrode connection portion in which the first liquid electrode and / or the second liquid electrode flows, and an electrode injection portion in which the first liquid electrode and / or the second liquid electrode is injected and is not connected to the electrode connection portion.

[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 frame disposed between the first current collector and the second current collector to form a first electrode receiving portion between the first current collector and the separator and a second electrode receiving portion between the second current collector and the separator, an electrode connection portion connecting the first electrode receiving portion and the second electrode receiving portion, and an electrode injection portion into which the first liquid electrode and / or the second liquid electrode is injected and which is not connected to the electrode connection 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 can be optimally designed by injecting the liquid electrode through a separate electrode injection port rather than through the electrode connection port.

[0011] Second, there is an advantage in that the liquid electrode can be evenly injected into two liquid electrode receiving portions by injecting the liquid electrode through an electrode injection portion with a short path rather than through a long path electrode connection portion.

[0012] Third, there is an advantage in that the electrode connection portion and the electrode injection portion are separate, so that the electrode connection portion is not closed when the electrode injection portion is closed after liquid electrode injection.

[0013] Fourth, there is an advantage in that the electrode connection part and the electrode injection part can be formed separately, and the electrode connection part can be formed in various places other than the frame.

[0014] 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.

[0015] Figure 1 is an exploded perspective view of a secondary battery according to one embodiment of the present invention.

[0016] Figure 2 is a perspective view of a secondary battery according to one embodiment of the present invention.

[0017] Figure 3 is a 3-3 cross-sectional view of the secondary battery illustrated in Figure 2.

[0018] Figure 4 is a perspective view of a secondary battery module according to one embodiment of the present invention.

[0019] Figure 5 is a perspective view of a frame of a secondary battery according to one embodiment of the present invention.

[0020] Figure 6 is a transparent front view of a frame of a secondary battery according to one embodiment of the present invention.

[0021] FIG. 7 is a transparent perspective view of a portion of a frame of a secondary battery according to one embodiment of the present invention.

[0022] Figure 8 is a cross-sectional view of a portion of a frame of a secondary battery according to one embodiment of the present invention.

[0023] Figure 9 is a perspective view of a frame of a secondary battery according to another embodiment of the present invention.

[0024] Figure 10 is a transparent front view of a frame of a secondary battery according to another embodiment of the present invention.

[0025] Figure 11 is a transparent perspective view of a portion of a frame of a secondary battery according to another embodiment of the present invention.

[0026] FIG. 12 is a perspective view of a frame of a secondary battery according to another embodiment of the present invention.

[0027] Figure 13 is a transparent front view of a frame of a secondary battery according to another embodiment of the present invention.

[0028] Figure 14 is a perspective view of a frame of a secondary battery according to another embodiment of the present invention.

[0029] Figure 15 is a transparent front view of a frame of a secondary battery according to another embodiment of the present invention.

[0030] Fig. 16 is a cross-sectional view taken along the line 15-15 of the secondary battery illustrated in Fig. 15.

[0031] 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.

[0032] 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.

[0033] Throughout the specification, unless otherwise specifically stated, each element may be singular or plural.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] Hereinafter, the present invention will be described with reference to drawings for explaining a secondary battery according to embodiments of the present invention.

[0039] 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.

[0040] 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 separator (120) disposed between the first current collector (130a) and the second current collector (130b), a frame (110) forming a first electrode receiving portion (111a) and a second electrode receiving portion (111b), a first liquid electrode accommodated in the first electrode receiving portion (111a) and in which a first half-reaction occurs, a second liquid electrode accommodated in the second electrode receiving portion (111b) and in which a second half-reaction occurs, a first solid electrode (150a) disposed in the first electrode receiving portion (111a) and in which the first liquid electrode is impregnated, and a second It includes a second solid electrode (150b) that is placed in an electrode receiving portion (111b) and impregnated with a second liquid electrode, a first adhesive member (160a) that combines a first current collector (130a) and a frame (110), and a second adhesive member (160b) that combines a second current collector (130b) and a frame (110).

[0041] 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.

[0042] 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.

[0043] V 2+ ←→ V 3+ + e -

[0044] During discharge, vanadium 2 ions are oxidized to vanadium 3 ions, and during charge, vanadium 3 ions are reduced to vanadium 2 ions.

[0045] The first liquid electrode is surrounded by a frame (110), 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 frame (110) by a first 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).

[0046] 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).

[0047] 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.

[0048] 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.

[0049] V 5+ + e - ←→ V 4+

[0050] During discharge, vanadium pentavalent ions are reduced to vanadium tetravalent ions, and during charge, vanadium tetravalent ions are oxidized to vanadium pentavalent ions.

[0051] The second liquid electrode is surrounded by a frame (110), 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 frame (110) by the second adhesive member. 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).

[0052] 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).

[0053] 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.

[0054] The frame (110) is formed as a hollow rectangle. Depending on the embodiment, the frame (110) may be formed as a rhombus, circle, triangle, or polygon larger than a pentagon. The frame (110) has a predetermined thickness in the out-of-plane direction to form the first electrode receiving portion (111a) and the second electrode receiving portion (111b). 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 through-thickness direction of the frame (110), but does not only mean a direction perpendicular to the in-plane direction.

[0055] The frame (110) has a first current collector (130a) arranged on one side in the out-of-plane direction and a second current collector (130b) arranged on the other side. The hollow of the frame (110) is closed by the first current collector (130a) and the second current collector (130b). It is preferable that the frame (110) be arranged between the first current collector (130a) and the second current collector (130b) to prevent the first liquid electrode and the second liquid electrode from leaking in the in-plane direction, etc., and according to an embodiment, a part of the frame (110) may protrude outside the first current collector (130a) or the second current collector (130b). The frame (110) is coupled to the first collector (130a) by the first adhesive member (160a) and to the second collector (130b) by the second adhesive member (160b).

[0056] A separator (120) is placed in the hollow space of the frame (110). The hollow space of the frame (110) is divided into two spaces by the separator (120). The frame (110) can be combined with the separator (120) using an adhesive having the same composition as the first adhesive member (160a) or the second adhesive member (160b).

[0057] The frame (110) forms a first electrode receiving portion (111a) between the first current collector (130a) and the separator (120), and forms a second electrode receiving portion (111b) between the second current collector (130b) and the separator (120).

[0058] The frame (110) accommodates a first liquid electrode and a second liquid electrode. The frame (110) has a first solid electrode (150a) and a second solid electrode (150b) arranged inside. The frame (110) has a first adhesive member (160a) adhered to one edge in the out-of-plane direction, and a second adhesive member (160b) adhered to the other edge in the out-of-plane direction.

[0059] A separator (120) is arranged inside the frame (110) to separate the first liquid electrode and the second liquid electrode and to allow hydrogen cations (protons) to move between the first liquid electrode and the second liquid electrode. The separator (120) is arranged in the center of the frame (110) in the thickness direction inside the frame (110) to separate the first electrode receiving portion (111a) and the second electrode receiving portion (111b).

[0060] The separator (120) is disposed between the first liquid electrode and the second liquid electrode. The separator (120) is disposed between the first current collector (130a) and the second current collector (130b). The separator (120) is disposed on the inner side in the in-plane direction of the frame (110) relative to the first adhesive member (160a) or the second adhesive member (160b). The edge of the separator (120) is coupled to the frame (110).

[0061] 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.

[0062] The separator (120) may include a perfluorinated ionomer, a partially fluorinated polymer, and non-fluorinated hydrocarbons. The separator (120) may be formed of or include Nafion®, Flemion®, NEOSEPTA-F®, or Gore Select®.

[0063] A first current collector (130a) is arranged on one side of a frame (110) to form a first electrode receiving portion (111a) together with the frame (110) and 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 bonded to a first adhesive member (160a) attached to the frame (110). The first current collector (130a) is coupled to the frame (110) by the first adhesive member (160a). The first adhesive member (160a) is applied or bonded to an edge of the first current collector (130a). The first current collector (130a) is electrically connected to the first liquid electrode, and electrons move to cause current to flow during charging and discharging.

[0064] When a plurality of secondary batteries are formed as a module with a plurality of frames (110), 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.

[0065] The first current collector (130a) includes a first metal current collector (131a) formed of metal and electrically connected to the bus bar, and a first carbon current collector (132a) disposed between the first metal current collector (131a) and the frame (110).

[0066] 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 each other, 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).

[0067] The first carbon collector (132a) is formed so that its edge matches the edge of the frame (110). The first carbon collector (132a) is joined to the frame (110) by a first adhesive member (160a). The first adhesive member (160a) is applied or adhered to the edge of the first carbon collector (132a).

[0068] 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.

[0069] 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.

[0070] 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.

[0071] The second current collector (130b) is placed on the other side of the frame (110) (the side opposite to the side where the first current collector (130a) is placed) to form a second electrode receiving portion (111b) together with the frame (110) and the separator (120). The second current collector (130b) is placed parallel to and spaced apart from the first current collector (130a). The second current collector (130b) is adhered to the second adhesive member (160b) attached to the frame (110). The second current collector (130b) is coupled to the frame (110) by the second adhesive member (160b). The second adhesive member (160b) is applied or adhered to the edge of the second current collector (130b). The second collector (130b) is electrically connected to the second liquid electrode, and electrons move to allow current to flow during charging and discharging.

[0072] When a plurality of secondary batteries are formed as a module with a plurality of frames (110), 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.

[0073] 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 frame (110).

[0074] 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).

[0075] The second carbon collector (132b) is formed so that its edge matches the edge of the frame (110). The second carbon collector (132b) is joined to the frame (110) by a second adhesive member (160b). The second adhesive member (160b) is applied or adhered to the edge of the second carbon collector (132b).

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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 a frame (110), a first current collector (130a), and a 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 frame (110) in the in-plane direction relative to the first adhesive member (160a).

[0080] The first solid electrode (150a) may be formed in a porous hexahedral shape. The first solid electrode (150a) may have a thickness greater than the thickness in the out-of-plane direction of the first electrode receiving portion (111a), and in this 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).

[0081] 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 frame (110), 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 frame (110) in the in-plane direction relative to the second adhesive member (160b).

[0082] The second solid electrode (150b) may be formed in a porous hexahedral shape. The second solid electrode (150b) may have a thickness greater than the thickness in the out-of-plane direction 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).

[0083] Each of the first adhesive member (160a) and the second adhesive member (160b) 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 adhesive member (160a) and the second adhesive member (160b) 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.

[0084] Each of the first adhesive member (160a) and the second adhesive member (160b) may be formed in a belt shape. Each of the first adhesive member (160a) and the second adhesive member (160b) may be formed in a hollow square shape. Each of the first adhesive member (160a) and the second adhesive member (160b) may be formed in a closed curve. Each of the first adhesive member (160a) and the second adhesive member (160b) is formed such that its edge coincides with the edge of the frame (110).

[0085] The first adhesive member (160a) joins the first carbon collector (132a) of the first current collector (130a) and the frame (110). The first adhesive member (160a) seals between the first carbon collector (132a) of the first current collector (130a) and the frame (110). The first adhesive member (160a) is laminated between the first carbon collector (132a) of the first current collector (130a) and the frame (110). The first adhesive member (160a) is adhered to one edge of the frame (110) in the out-of-plane direction. The first adhesive member (160a) is adhered to the edge of the side on which the first metal collector (131a) is not arranged among both sides of the first carbon collector (132a). The first adhesive member (160a) can be applied to the first carbon collector (132a) and adhered to the frame (110).

[0086] The first adhesive member (160a) is arranged so that the edges of the first carbon collector (132a) of the first current collector (130a) and the frame (110) are aligned. The first adhesive member (160a) is arranged on the outer side in the in-plane direction of the frame (110) relative to the first solid electrode (150a). The first adhesive member (160a) is arranged on the outer side in the in-plane direction of the first electrode receiving portion (111a) of the frame (110). The first adhesive member (160a) is arranged on the outer side in the in-plane direction of the separator (120) of the frame (110).

[0087] The second adhesive member (160b) joins the second carbon collector (132b) of the second current collector (130b) and the frame (110). The second adhesive member (160b) seals between the second carbon collector (132b) of the second current collector (130b) and the frame (110). The second adhesive member (160b) is laminated between the second carbon collector (132b) of the second current collector (130b) and the frame (110). The second adhesive member (160b) is adhered to the other edge in the outward direction of the frame (110). The second adhesive member (160b) is adhered to the edge of the side on which the second metal collector (131b) is not arranged among both sides of the second carbon collector (132b). The first adhesive member (160a) can be applied to the second carbon collector (132b) and adhered to the frame (110).

[0088] The second adhesive member (160b) is arranged so that the edges of the second carbon collector (132b) of the second current collector (130b) and the frame (110) are aligned. The second adhesive member (160b) is arranged on the outer side in the in-plane direction of the frame (110) relative to the second solid electrode (150b). The second adhesive member (160b) is arranged on the outer side in the in-plane direction of the second electrode receiving portion (111b) of the frame (110). The second adhesive member (160b) is arranged on the outer side in the in-plane direction of the separator (120) of the frame (110).

[0089] The overall configuration of the secondary battery according to the present invention configured as described above is as follows.

[0090] A separator (120) is attached to the center of the thickness direction of a rectangular frame (110) having a predetermined thickness. A first current collector (130a) is attached to one side of the frame (110) in the out-of-plane direction by a first adhesive member (160a), and a second current collector (130b) is attached to the other side of the frame (110) in the out-of-plane direction by a second adhesive member (160b), thereby forming a first electrode receiving portion (111a) and a second electrode receiving portion (111b). That is, the frame (110) is placed between the first current collector (130a) and the second current collector (130b), and the separator (120) is placed within the frame (110).

[0091] 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).

[0092] The first adhesive member (160a) or the second adhesive member (160b) is adhered to the edge of the frame (110) and is adhered to the edge of the first carbon collector (132a) or the edge of the second carbon collector (132b). The first adhesive member (160a), the second adhesive member (160b), the frame (110), the first carbon collector (132a), and the second carbon collector (132b) are arranged so that their in-plane edges coincide with each other, and when they are joined together, they form a rectangular parallelepiped shape.

[0093] 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 plurality of frames (110) to which a separator (120) is coupled, and the second current collector (130b) may be placed between a plurality of frames (110) 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).

[0094] FIG. 5 is a perspective view of a frame of a secondary battery according to one embodiment of the present invention, FIG. 6 is a transparent front view of a frame of a secondary battery according to one embodiment of the present invention, FIG. 7 is a transparent perspective view of a part of a frame of a secondary battery according to one embodiment of the present invention, and FIG. 8 is a cross-sectional view of a part of a frame of a secondary battery according to one embodiment of the present invention.

[0095] A frame (110) according to one embodiment of the present invention includes a hollow rectangular frame body (119), a hollow membrane support member (115) that protrudes inward from the hollow portion of the frame body (119) and is coupled to a membrane (120), and a frame body (119) that is arranged in the hollow portion of the membrane support member (115).

[0096] The frame body (119) is formed in a hollow rectangular shape consisting of four sides. The hollow portion of the frame body (119) forms a first electrode receiving portion (111a) and a second electrode receiving portion (111b). The frame body (119) is formed with a separator support portion (115) that protrudes in the plane direction in the hollow portion. An electrode connection portion (112) is formed in the frame body (119).

[0097] The frame body (119) has a first adhesive member (160a) adhered to one side in the out-of-plane direction and a second adhesive member (160b) adhered to the other side in the out-of-plane direction. The frame body (119) is coupled to the first current collector (130a) by the first adhesive member (160a) on one side in the out-of-plane direction and is coupled to the second current collector (130b) by the second adhesive member (160b) on the other side in the out-of-plane direction.

[0098] The membrane support (115) is formed in a rectangular shape by protruding toward the center in the in-plane direction from the hollow portion of the frame body (119). Referring to Fig. 3, the membrane support (115) is positioned at the center in the thickness direction (out-of-plane direction) of the frame body (119).

[0099] The separator (120) is joined at its edge to the separator support (115) so as to be stretched out tautly. It is preferable that the separator support (115) have a minimum width capable of supporting the separator (120). The separator support (115) serves as a rib that reinforces the in-plane direction of the frame body (119), so that the frame body (119) is not deformed in the in-plane direction, etc. even when the first liquid electrode or the second liquid electrode expands or contracts, gas is generated within the liquid electrode, or an external impact occurs.

[0100] In order to prevent the first liquid electrode or the second liquid electrode from leaking between the membrane support (115) and the membrane (120), the membrane support (115) is completely bonded to the membrane (120) on one side. An adhesive having the same composition as the first adhesive member (160a) or the second adhesive member (160b) may be laminated between the membrane support (115) and the membrane (120). The membrane support (115) and the membrane (120) may be bonded by an adhesive including 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.

[0101] A secondary battery according to one embodiment of the present invention further includes an electrode connection portion (112) connecting a first electrode receiving portion (111a) and a second electrode receiving portion (111b), and an electrode injection portion (114) formed on a frame (110) into which a first liquid electrode and / or a second liquid electrode is injected and which is not connected to the electrode connection portion (112).

[0102] The electrode connection portion (112) 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, where 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 part (112) 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 part (112) or moves to the second liquid electrode or the first liquid electrode with reduced volume through the electrode connection part (112).

[0103] The electrode connection part (112) connects the first electrode receiving part (111a) and the second electrode receiving part (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.

[0104] It is preferable that the electrode connection portion (112) be formed thin and long so as to have a resistance value greater than a certain level while having a volume greater 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.

[0105] The electrode connection portion (112) is formed in a direction (outside the plane (thickness direction) of the frame (110)) that penetrates at least a portion of the plane formed by the separator (120). It is preferable that the portion of the electrode connection portion (112) formed in a direction that penetrates the plane formed by the separator (120) (the electrode connection hole (1121) to be described later) is formed substantially in the center of the electrode connection portion (112).

[0106] The electrode connection portion (112) can be bent at least twice. The electrode connection portion (112) is bent from the in-plane direction of the frame (110) to the out-of-plane direction (or from the out-of-plane direction to the in-plane direction), and is bent from the in-plane direction of the frame (110) to the in-plane direction.

[0107] The electrode connection portion (112) is formed on a part of the frame body (119) surrounding the first solid electrode (150a) or the second solid electrode (150b) and is arranged on a part of the periphery of the first solid electrode (150a) or the second solid electrode (150b).

[0108] The electrode connection portion (112) is positioned on the outer side in the in-plane direction relative to the separator support portion (115). The electrode connection portion (112) is positioned on the inner side in the in-plane direction relative to the first adhesive member (160a) or the second adhesive member (160b). The electrode connection portion (112) is covered with the first adhesive member (160a) or the second adhesive member (160b).

[0109] In this embodiment, the electrode connection portion (112) is described as being formed in the frame body (119) of the frame (11), but depending on the embodiment, the electrode connection portion (112) may be formed in the separator (120) and / or the separator support portion (115).

[0110] Referring to FIG. 6, the electrode connection portion (112) includes an electrode connection hole (1121) formed as a hole in the out-of-plane direction (thickness direction) of the frame (110), a first electrode connection line (1123a) formed in the frame (110) and connecting the electrode connection hole (1121) and the first electrode receiving portion (111a), and a second electrode connection line (1123b) formed in the frame (110) and connecting the electrode connection hole (1121) and the second electrode receiving portion (111b).

[0111] The electrode connection hole (1121) is a hole formed by penetrating the frame body (119) in the out-of-plane direction (thickness direction). The electrode connection hole (1121) is arranged in a direction penetrating the plane formed by the separator (120). The electrode connection hole (1121) can be perpendicular to the plane formed by the separator (120). One end of the electrode connection hole (1121) is connected perpendicular to the first electrode connection line (1123a), and the other end is connected perpendicular to the second electrode connection line (1123b).

[0112] The electrode connection hole (1121) formed in the out-of-plane direction is bent in the in-plane direction at one end to be connected to the first electrode connection line (1123a) and is bent in the in-plane direction at the other end to be connected to the second electrode connection line (1123b). The electrode connection hole (1121) connects the first electrode connection line (1123a) and the second electrode connection line (1123b).

[0113] The electrode connection hole (1121) is formed at one corner of the rectangular frame body (119). Due to the molding process of the frame (110), the electrode connection hole (1121) cannot be formed exactly at the corner of the frame body (119), but is formed as close to the corner as possible.

[0114] The first electrode connection line (1123a) is formed as a groove on one side of the out-of-plane direction of the frame body (119). The first electrode connection line (1123a) is formed with the in-plane direction as the longitudinal direction along the frame body (119).

[0115] The first electrode connection line (1123a) is bent at least once in the direction of the plane of the frame (110). The first electrode connection line (1123a) is formed long along one side of the frame body (119) in the electrode connection hole (1121), and then is bent once at a right angle at a corner of the frame body (119) and is formed long along the other side of the frame body (119). The first electrode connection line (1123a) is formed in an L shape in the electrode connection hole (1121) and then is connected to the first electrode receiving portion (111a). In addition to the portion where the first electrode connection line (1123a) is bent once at a right angle, the portion connected to the electrode connection hole (1121) or the portion connected to the first electrode receiving portion (111a) may be bent.

[0116] A first electrode connection line (1123a) is formed on two adjacent sides of the frame body (119). A first electrode connection drain (1125a) is formed on the first electrode connection line (1123a) so as to be connected to the first electrode receiving portion (111a). The first electrode connection drain (1125a) is formed near one corner of the frame body (119) (a corner facing the corner where the electrode injection portion (114) is formed). The first electrode connection line (1123a) is covered by a first adhesive member (160a).

[0117] The second electrode connection line (1123b) is formed as a groove on the other side of the frame body (119) in the out-of-plane direction. The second electrode connection line (1123b) is formed along the frame body (119) with the in-plane direction as the longitudinal direction.

[0118] The second electrode connection line (1123b) is bent at least once in the direction of the plane of the frame (110). The second electrode connection line (1123b) is formed long along one side of the frame body (119) in the electrode connection hole (1121), and then is bent once at a right angle at a corner of the frame body (119) and is formed long along the other side of the frame body (119). The second electrode connection line (1123b) is formed in an L shape in the electrode connection hole (1121) and then is connected to the second electrode receiving portion (111b). In addition to the portion where the second electrode connection line (1123b) is bent once at a right angle, the portion connected to the electrode connection hole (1121) or the portion connected to the second electrode receiving portion (111b) may be bent.

[0119] A second electrode connection line (1123b) is formed on two adjacent sides of the frame body (119). A second electrode connection drain (1125b) is formed on the second electrode connection line (1123b) so as to be connected to the second electrode receiving portion (111b). The second electrode connection drain (1125b) is formed near one corner of the frame body (119) (a corner facing the corner where the electrode injection portion (114) is formed). The second electrode connection line (1123b) is covered by a second adhesive member (160b).

[0120] Since the first electrode connection line (1123a) and the second electrode connection line (1123b) are formed as grooves in the frame body (119), they affect the strength of the frame body (119). Therefore, it is preferable that the first electrode connection line (1123a) and the second electrode connection line (1123b) are not formed in the same part of the frame body (119). That is, the first electrode connection line (1123a) is formed in a part of the frame body (119) of the frame (110) where the second electrode connection line (1123b) is not formed.

[0121] The first electrode connection line (1123a) is formed substantially symmetrically with the second electrode connection line (1123b) based on the center of the frame (110). Since the electrode connection hole (1121) cannot be formed precisely at the corner of the frame body (119) due to the molding process of the frame (110), the first electrode connection line (1123a) and the second electrode connection line (1123b) are substantially symmetrical even if not perfectly symmetrical. The first electrode connection line (1123a) does not overlap with the second electrode connection line (1123b) when projected in the thickness direction (out-of-plane direction) of the frame (110).

[0122] In this embodiment, the first electrode connection line (1123a) and the second electrode connection line (1123b) are described as being formed on four sides of the frame body (119) so as not to overlap each other. However, depending on the embodiment, the first electrode connection line (1123a) may be formed on one side of the frame body (119) and the second electrode connection line (1123b) may be formed on the other side of the frame body (119). That is, the first electrode connection line (1123a) and the second electrode connection line (1123b) may be formed on two sides of the frame body (119) so as not to overlap each other.

[0123] In order to allow the first liquid electrode or the second liquid electrode to move through the electrode connection portion (112) and achieve balance, it is preferable that the electrode connection portion (112) be formed such that the portion connected to the first electrode receiving portion (111a) and the portion connected to the second electrode receiving portion (111b) have substantially the same volume. Accordingly, it is preferable that the electrode connection hole (1121) be formed in the center of the electrode connection portion (112).

[0124] The electrode injection portion (114) is formed in the frame (110) 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 in the frame (110) so that one end thereof is open to the outside. The electrode injection portion (114) is formed so that a first liquid electrode is injected into the first electrode receiving portion (111a) and a second liquid electrode is injected into the second electrode receiving portion (111b).

[0125] The electrode injection portion (114) connects the first electrode receiving portion (111a) and the second electrode receiving portion (111b). At least a portion of the electrode injection portion (114) is formed in a direction (out-of-plane direction (thickness direction) of the frame (110)) that penetrates the plane formed by the separator (120). It is preferable that the portion of the electrode injection portion (114) formed in a direction that penetrates the plane formed by the separator (120) (the electrode injection hole (1143) to be described later) is formed substantially in the center of the electrode injection portion (114). The electrode injection portion (114) branches off from one end open to the outside and is connected to the first electrode receiving portion (111a) and the second electrode receiving portion (111b).

[0126] 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.

[0127] The electrode injection part (114) is not connected to the electrode connection part (112). The electrode injection part (114) is placed in a part of the frame (110) where the electrode connection part (112) is not placed. The electrode injection part (114) is placed at a corner of the frame (110) where the electrode connection part (112) is not placed. In the present embodiment, the electrode injection part (114) is placed at a corner facing the corner where the electrode connection hole (1121) of the frame (110) is placed.

[0128] The electrode injection portion (114) is formed to be shorter than the electrode connection portion (112). Both the electrode injection portion (114) and the electrode connection portion (112) connect the first electrode receiving portion (111a) and the second electrode receiving portion (111b), but the electrode injection portion (114) connects the first electrode receiving portion (111a) and the second electrode receiving portion (111b) 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), and the electrode connection portion (112) connects the first electrode receiving portion (111a) and the second electrode receiving portion (111b) so that the first liquid electrode and / or the second liquid electrode flows in order to resolve the imbalance of the liquid electrode during charging or discharging. Accordingly, the electrode injection portion (114) is formed relatively short and the electrode connection portion (112) is formed relatively long. In addition, the electrode injection portion (114) is closed after the first liquid electrode and / or the second liquid electrode is injected.

[0129] Referring to FIG. 7, the electrode injection portion (114) includes an electrode injection hole (1143) formed in the thickness direction of the frame (110), an electrode injection port (1141) that is connected to the electrode injection hole (1143) and opens to the outside, a first electrode injection drain (1145a) that connects the electrode injection hole (1143) and the first electrode receiving portion (111a), a second electrode injection drain (1145b) that connects the electrode injection hole (1143) and the second electrode receiving portion (111b), and a sealing portion (1149) that is inserted into the electrode injection hole (1143) after the first liquid electrode and / or the second liquid electrode is injected to seal the electrode injection port (1141) and close the electrode injection hole (1143).

[0130] The electrode injection port (1141) has one end open to the outside and the other end connected to the center of the length direction of the electrode injection hole (1143). The electrode injection port (1141) is formed at the center of the thickness direction of the frame body (119). The electrode injection port (1141) is formed in the direction within the plane of the frame (110). The electrode injection port (1141) is formed in a direction orthogonal to the electrode injection hole (1143).

[0131] The electrode inlet (1141) is a passage through which a liquid electrode supplied from the outside flows in. The electrode inlet (1141) branches into an electrode injection hole (1143) and is connected to the first electrode receiving portion (111a) and the second electrode receiving portion (111b). The liquid electrode flowing into the electrode inlet (1141) flows into the electrode injection hole (1143).

[0132] The electrode injection hole (1143) is a hole formed by penetrating the frame body (119) in the out-of-plane direction (thickness direction). The electrode injection hole (1143) is arranged in a direction penetrating the plane formed by the separator (120). The electrode injection hole (1143) can be perpendicular to the plane formed by the separator (120). One end of the electrode injection hole (1143) is connected perpendicular to the first electrode injection drain (1145a), the other end is connected perpendicular to the second electrode injection drain (1145b), and the center is connected to the electrode injection port (1141). One end of the electrode injection hole (1143) is covered by the first adhesive member (160a), and the other end is covered by the second adhesive member (160b).

[0133] The electrode injection hole (1143) is formed close to one corner of the rectangular frame body (119). The electrode injection hole (1143) is positioned near a corner where the electrode connection hole (1121) of the frame (110) is not positioned. In the present embodiment, the electrode injection hole (1143) is positioned at a corner facing the corner where the electrode connection hole (1121) of the frame (110) is positioned.

[0134] The electrode injection hole (1143) branches off the electrode injection port (1141) so that the liquid electrode introduced into the electrode injection port (1141) flows to the first electrode receiving portion (111a) and the second electrode receiving portion (111b).

[0135] The first electrode injection drain (1145a) is formed in the frame body (119) so as to be connected to the first electrode receiving portion (111a) at the shortest distance from one end of the electrode injection hole (1143). The first electrode injection drain (1145a) is connected orthogonally to one end of the electrode injection hole (1143). The first electrode injection drain (1145a) is formed as a straight line with the longitudinal direction in the in-plane direction of the frame body (119) without being bent. The first electrode injection drain (1145a) is formed shorter than the first electrode connection line (1123a) of the electrode connection portion (112). The first electrode injection drain (1145a) is formed as a groove on one side in the out-of-plane direction of the frame body (119). The first electrode injection drain (1145a) is covered by the first adhesive member (160a).

[0136] The liquid electrode flowing into the electrode inlet (1141) branches off from the electrode injection hole (1143) and some of it flows into the first electrode injection drain (1145a), and the liquid electrode flowing into the first electrode injection drain (1145a) is stored in the first electrode receiving portion (111a).

[0137] The second electrode injection drain (1145b) is formed in the frame body (119) so as to be connected to the second electrode receiving portion (111b) at the other end of the electrode injection hole (1143) at the shortest possible distance. The second electrode injection drain (1145b) is connected orthogonally to the other end of the electrode injection hole (1143). The second electrode injection drain (1145b) is formed as a straight line with the longitudinal direction in the in-plane direction of the frame body (119) without being bent. The second electrode injection drain (1145b) is formed shorter than the second electrode connection line (1123b) of the electrode connection portion (112). The second electrode injection drain (1145b) is formed as a groove on one side in the out-of-plane direction of the frame body (119). The second electrode injection drain (1145b) is covered by the second adhesive member (160b).

[0138] The liquid electrode flowing into the electrode inlet (1141) branches off from the electrode injection hole (1143) and flows into the second electrode injection drain (1145b), and the liquid electrode flowing into the second electrode injection drain (1145b) is stored in the second electrode receiving portion (111b).

[0139] The first electrode injection drain (1145a) and the second electrode injection drain (1145b) are formed in the same direction so as to overlap each other when projected in the thickness direction of the frame (110). In the present embodiment, the first electrode injection drain (1145a) and the second electrode injection drain (1145b) are formed in the same direction as the electrode injection port (1141) and are formed in a direction parallel to one side of the frame body (119).

[0140] The sealing part (1149) is inserted into the electrode injection port (1141) to seal the electrode injection port (1141). After the injection of the liquid electrode through the electrode injection port (114) is completed, the electrode injection port (114) must be sealed. However, if only the electrode injection port (1141) is closed, the first liquid electrode and / or the second liquid electrode may flow through the first electrode injection drain (1145a), the second electrode injection drain (1145b), and the electrode injection hole (1143), resulting in a short circuit. The electrode connection part (112) is long and therefore does not cause any problems, but the electrode injection port (114) is short and has low resistance, resulting in a short circuit when the first liquid electrode and the second liquid electrode are mixed. Accordingly, as shown in Fig. 8, the sealing portion (1149) also closes the electrode injection hole (1143) to prevent the first liquid electrode and the second liquid electrode from mixing. The sealing portion (1149) not only seals the electrode injection port (1141), but is also positioned at the corner of the frame (110) where the electrode injection hole (1143) is formed to reinforce the strength of the corner.

[0141] The sealing portion (1149) is a long cylindrical rod-shaped member in the in-plane direction of the frame (110), and is pressed into the electrode injection port (1141) to completely fill the electrode injection port (1141) and partially fill the electrode injection hole (1143). The sealing portion (1149) has a sufficient length to be pressed into the electrode injection hole (1143) and close the electrode injection hole (1143). The sealing portion (1149) may include 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. According to an embodiment, the sealing member (1149) may be one of a solvent-type, emulsion-type, hot melt-type, and liquid-curing adhesive / glue, and may be injected into the electrode injection port (1141) to seal the electrode injection port (1141). When the sealing member (1149) is injected into the electrode injection port (1141), the sealing member (1149) may be injected up to the electrode injection hole (1143) to close the electrode injection hole (1143).

[0142] Depending on the embodiment, a separate sealing member may close the electrode injection hole (1143).

[0143] FIG. 9 is a perspective view of a frame of a secondary battery according to another embodiment of the present invention, FIG. 10 is a transparent front view of a frame of a secondary battery according to another embodiment of the present invention, and FIG. 11 is a transparent perspective view of a part of a frame of a secondary battery according to another embodiment of the present invention.

[0144] The frame body (219) and the separator support (215) of the frame (210) of the secondary battery according to another embodiment of the present invention are identical to the frame body (119) and the separator support (115) of the frame (110) according to one embodiment of the present invention, and therefore, a description thereof is omitted.

[0145] According to another embodiment of the present invention, only the parts that are different from the electrode connection part (212) and the electrode injection part (214) of the secondary battery compared to the electrode connection part (112) and the electrode injection part (114) according to one embodiment of the present invention will be described.

[0146] According to another embodiment of the present invention, the electrode injection hole (2143) of the electrode injection part (214) is formed at one corner of the frame body (219). Due to the molding process of the frame (210), the electrode injection hole (2143) cannot be formed exactly at the corner of the frame body (219), but is substantially formed at the corner.

[0147] Accordingly, the first electrode injection drain (2145a) and the second electrode injection drain (2145b) are formed toward the center of the plane of the frame (210) so as to be connected to the first electrode receiving portion (111a) and the second electrode receiving portion (111b) in the shortest possible time. However, the electrode injection port (2141) is formed in a direction parallel to one side of the frame body (219), as in one embodiment of the present invention. Therefore, in the present embodiment, the first electrode injection drain (2145a) and the second electrode injection drain (2145b) are not formed in the same direction as the electrode injection port (2141).

[0148] In this embodiment, since the electrode injection hole (2143) is positioned at a corner of the frame (210) symmetrical to the electrode connection hole (2121) with respect to the center of the frame (210), the first electrode connection drain (2125a) and the second electrode connection drain (2125b) can be positioned closer to the corner of the frame (210), and the first electrode connection line (2123a) and the second electrode connection line (2123b) can be formed longer compared to one embodiment of the present invention.

[0149] In this embodiment, the sealing portion (2149) is placed at one corner of the frame body (219) to seal the electrode injection port (2141) and close the electrode injection hole (2143).

[0150] FIG. 12 is a perspective view of a frame of a secondary battery according to another embodiment of the present invention, and FIG. 13 is a transparent front view of a frame of a secondary battery according to another embodiment of the present invention.

[0151] The frame body (319) and the separator support (315) of the frame (310) of the secondary battery according to another embodiment of the present invention are identical to the frame body (119) and the separator support (115) of the frame (110) according to one embodiment of the present invention, and therefore, a description thereof is omitted.

[0152] According to another embodiment of the present invention, only the parts that are different from the electrode connection part (312, 313) and the electrode injection part (314) of the secondary battery are described.

[0153] According to another embodiment of the present invention, a plurality of electrode connection parts (312) are provided, and an electrode injection part (314) is arranged in a portion of the frame (310) where a plurality of electrode connection parts (312, 313) are not arranged. The plurality of electrode connection parts (312, 313) include a plurality of electrode connection holes (3121, 3131) formed in the out-of-plane direction (thickness direction) of the frame body (319), and the electrode injection part (314) is arranged in a corner of the frame (310) where a plurality of electrode connection holes (3121, 3131) are not arranged.

[0154] In this embodiment, the plurality of inter-electrode connecting portions (312, 313) include a first inter-electrode connecting portion (312) and a second inter-electrode connecting portion (313).

[0155] Each of the first electrode connection portion (312) and the second electrode connection portion (313) has one end connected to the first electrode receiving portion (111a) and the other end connected to the second electrode receiving portion (111b). Each of the first electrode connection portion (312) and the second electrode connection portion (313) allows the first liquid electrode and / or the second liquid electrode to flow.

[0156] The first electrode connection portion (312) includes a first electrode connection hole (3121) formed in the out-of-plane direction (thickness direction) of the frame body (319) and a first electrode connection line (3123) formed in the in-plane direction of the frame body (319). In addition, the second electrode connection portion (313) includes a second electrode connection hole (3131) formed in the out-of-plane direction (thickness direction) of the frame body (319) and a second electrode connection line (3133) formed in the in-plane direction of the frame body (319). In the present embodiment, the first electrode connection hole (3121) and the second electrode connection hole (3131) are respectively arranged at two opposite corners of the frame (310).

[0157] According to another embodiment of the present invention, the electrode injection hole (3143) of the electrode injection unit (314) is positioned at a corner where the first electrode connection hole (3121) and the second electrode connection hole (3131) of the frame (310) are not positioned. The electrode injection hole (3143) is positioned at a corner adjacent to a corner where the first electrode connection hole (3121) or the second electrode connection hole (3131) of the frame (310) is positioned.

[0158] Although not shown in the drawing, the electrode injection part (314) further includes a sealing part that is inserted into the electrode injection port after the first liquid electrode and / or the second liquid electrode is injected to seal the electrode injection port and close the electrode injection hole (3143).

[0159] FIG. 14 is a perspective view of a frame of a secondary battery according to another embodiment of the present invention, FIG. 15 is a transparent front view of a frame of a secondary battery according to another embodiment of the present invention, and FIG. 16 is a cross-sectional view taken along the line 15-15 of the secondary battery illustrated in FIG. 15.

[0160] The frame body (419) and the separator support (415) of the frame (410) of the secondary battery according to another embodiment of the present invention are identical to the frame body (119) and the separator support (115) of the frame (110) according to one embodiment of the present invention, and therefore, a description thereof is omitted.

[0161] According to another embodiment of the present invention, only the parts that are different from the electrode connection part (412) and the electrode injection part (414a, 414b) of the secondary battery are described.

[0162] According to another embodiment of the present invention, a secondary battery has a plurality of electrode injection parts (414a, 414b), and one of the plurality of electrode injection parts (414a, 414b) is connected to the first electrode receiving part (111a) to inject the first liquid electrode, and another of the plurality of electrode injection parts (414a, 414b) is connected to the second electrode receiving part (111b) to inject the second liquid electrode.

[0163] In this embodiment, among the plurality of electrode injection parts (414a, 414b), the electrode injection part (414a) into which the first liquid electrode is injected is arranged on the second electrode connection line (4123b) so as not to be connected to the second electrode connection line (4123b), and among the plurality of electrode injection parts (414a, 414b), the electrode injection part (414b) into which the second liquid electrode is injected is arranged on the first electrode connection line (4123a) so as not to be connected to the first electrode connection line (4123a). The plurality of electrode injection parts (414a, 414b) are arranged near a corner where the electrode connection hole (4121) of the frame (410) is not arranged.

[0164] In this embodiment, the plurality of electrode injection parts (414a, 414b) include a first electrode injection part (414a) connected to a first electrode receiving part (111a) into which a first liquid electrode is injected, and a second electrode injection part (414b) connected to a second electrode receiving part (111b) into which a second liquid electrode is injected.

[0165] The first electrode injection portion (414a) is positioned on the second electrode connection line (4123b) so as not to be connected to the second electrode connection line (4123b), and is positioned near one corner adjacent to the corner where the electrode connection hole (4121) of the frame (410) is positioned. The second electrode injection portion (414b) is positioned on the first electrode connection line (4123a) so as not to be connected to the first electrode connection line (4123a), and is positioned near another corner adjacent to the corner where the electrode connection hole (4121) of the frame (410) is positioned.

[0166] Referring to FIG. 16, the second electrode connection line (4123b) is formed as a groove in the frame body (419), and the first electrode injection portion (414a) is arranged to be spaced apart from the second electrode connection line (4123b) in the thickness direction of the frame (410). The first electrode injection port (4141a) of the first electrode injection portion (414a) is formed at the center of the thickness direction of the frame body (419), similar to the electrode injection port (1141) according to one embodiment of the present invention. However, the first electrode injection hole (4143a) of the first electrode injection portion (414a) is formed so as not to penetrate the frame body (419) in the out-of-plane direction (thickness direction) and to connect the first electrode injection port (4141a) and the first electrode injection drain (4145a) and not to be connected to the second electrode connection line (4123b). The first electrode injection hole (4143a) is connected to the first electrode receiving portion (111a) through the first electrode injection drain (4145a).

[0167] Although not shown in the drawing, the second electrode injection portion (414b) and the first electrode connection line (4123a) are also arranged in the same structure as described with reference to FIG. 16.

[0168] Although not shown in the drawing, each of the plurality of electrode injection portions (414a, 414b) further includes a sealing portion that is inserted into the electrode injection port after the first liquid electrode or the second liquid electrode is injected to seal the electrode injection port and close the electrode injection hole.

[0169] 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 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 frame forming a first electrode receiving portion, which is a space where the first liquid electrode is stored, and a second electrode receiving portion, which is a space where the second liquid electrode is stored; A separator coupled to the frame and positioned between the first electrode receiving portion and the second electrode receiving portion; An electrode connection connecting the first electrode receiving portion and the second electrode receiving portion; and A secondary battery including an electrode injection portion into which the first liquid electrode and / or the second liquid electrode is injected and which is not connected to the electrode connection portion.

2. In paragraph 1, A secondary battery in which the electrode injection portion is closed after the first liquid electrode and / or the second liquid electrode is injected.

3. In paragraph 1, A secondary battery in which the electrode injection portion is shorter than the electrode inter-connection portion.

4. In paragraph 1, A secondary battery in which the electrode injection part is placed in a part of the frame where the electrode connection part is not placed.

5. In paragraph 1, The above frame is formed as a hollow rectangle, The above electrode connection part includes an electrode connection hole formed in the thickness direction of the frame, The above electrode connection hole is placed at one corner of the frame, A secondary battery in which the electrode injection portion is placed at a corner of the frame where the electrode connection hole is not placed.

6. In paragraph 5, A secondary battery in which the electrode injection portion is placed at a corner facing the corner where the electrode connection hole of the frame is placed.

7. In paragraph 5, A secondary battery in which the electrode injection portion is placed at a corner adjacent to the corner where the electrode connection hole of the frame is placed.

8. In paragraph 1, The above electrode injection part, An electrode injection hole formed in the thickness direction of the above frame; and A secondary battery including an electrode injection port that is connected to the above electrode injection hole and opens to the outside.

9. In paragraph 8, A secondary battery in which the electrode injection port is formed in a direction perpendicular to the electrode injection hole.

10. In paragraph 8, A secondary battery in which the above electrode injection port is formed in the direction of the plane of the frame.

11. In paragraph 8, The above frame is formed as a hollow rectangle, The above electrode connection part includes an electrode connection hole formed in the thickness direction of the frame, A secondary battery in which the above electrode injection hole is formed at a corner of the above frame where the above electrode connection hole is not formed.

12. In paragraph 8, The above electrode injection part, A first electrode injection drain connecting the electrode injection hole and the first electrode receiving portion; and A secondary battery further comprising a second electrode injection drain connecting the electrode injection hole and the second electrode receiving portion.

13. In paragraph 8, A secondary battery wherein the electrode injection portion further includes a sealing portion that closes the electrode injection hole after the first liquid electrode and / or the second liquid electrode is injected.

14. In paragraph 13, The above sealing portion is a secondary battery placed at a corner of the frame.

15. In paragraph 1, The above electrode connection part is provided in multiple numbers, A secondary battery in which the electrode injection unit is placed in a portion of the frame where the plurality of electrode connection units are not placed.

16. In paragraph 15, The above frame is formed as a hollow rectangle, The plurality of electrode connection parts include a plurality of electrode connection holes formed in the thickness direction of the frame, The above plurality of electrode connection holes are arranged at a plurality of corners of the frame, A secondary battery in which the electrode injection part is placed at a corner of the frame where the plurality of electrode connection holes are not arranged.

17. In paragraph 1, The above electrode injection part is provided in multiple numbers, One of the plurality of electrode injection portions is injected with the first liquid electrode, A secondary battery in which another of the plurality of electrode injection portions is injected with the second liquid electrode.

18. In paragraph 17, The above electrode connection part is, An electrode connection hole formed in the thickness direction of the above frame; A first electrode connection line connecting the electrode connection hole and the first electrode receiving portion; and It includes a second electrode connection line connecting the electrode connection hole and the second electrode receiving portion, Among the plurality of electrode injection parts, the electrode injection part into which the first liquid electrode is injected is disposed on the second electrode connection line, A secondary battery wherein the electrode injection part into which the second liquid electrode is injected among the plurality of electrode injection parts is disposed on the first electrode connection line.

19. 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 frame supporting the above separator; An electrode connection through which the first liquid electrode and / or the second liquid electrode flows; and A secondary battery including an electrode injection portion into which the first liquid electrode and / or the second liquid electrode is injected and which is not connected to the electrode connection portion.

20. First House; A second collector disposed spaced apart from the first collector; A separator disposed between the first collector and the second collector; A frame disposed between the first current collector and the second current collector to form a first electrode receiving portion between the first current collector and the separator and to form a second electrode receiving portion between the second current collector and the separator; An electrode connection connecting the first electrode receiving portion and the second electrode receiving portion; and A secondary battery including an electrode injection portion into which the first liquid electrode and / or the second liquid electrode is injected and which is not connected to the electrode connection portion.

Images