KR20200080949A - A Battery Cell for Redox flow battery having a mixed serial and parallel structure - Google Patents

Abstract

The present invention relates to a battery cell for a redox flow battery having a mixed serial and parallel structure. The battery cell for a redox flow battery having a mixed serial and parallel structure comprises: a first serial module including a first unit cell having a positive electrode and a negative electrode, and a first adjacent unit cell disposed adjacent to the first unit cell and having a positive electrode disposed in series to be adjacent to the negative electrode of the first unit cell; a second serial module including a second unit cell having a positive electrode and a negative electrode, and a second adjacent unit cell disposed adjacent to the second unit cell, and having a negative electrode disposed in series to be adjacent to the positive electrode of the second unit cell, the second serial module being disposed in parallel to the first serial module such that the negative electrode of the second unit cell is adjacent to the negative electrode of the first adjacent unit cell; a first positive electrode current collecting plate disposed on the outside of the first serial module; a second positive electrode current collecting plate disposed on the outside of the second serial module; and an intermediate current collecting plate for a negative electrode, disposed between the first and second serial modules.

Description

A battery cell for a redox flow battery having a mixed serial and parallel structure

The present invention relates to a battery cell for a redox flow battery in which a series-parallel structure is mixed. In particular, the efficiency of the battery is improved by reducing the generation of shunt current inside the battery cell where an electrolytic reaction occurs, and the structure is simplified. , It relates to a battery cell for a redox flow battery in which a series-parallel structure is mixed to facilitate connection with an external circuit.

As shown in FIG. 1, a redox flow battery in which charging and discharging is performed as the electrolyte is circulated, generally includes an anode electrolyte solution 121a and a cathode electrolyte solution 122a, which serve to store electric power through a chemical reaction. Including the battery cell 110 to induce the reaction of the electrolyte to charge or discharge power, and the electrolyte flow path 130 for circulating the positive electrode electrolyte 121a and the negative electrode electrolyte 122a into the battery cell 110 do. In addition, the battery cell 110 is an ion exchange membrane 111 for ion exchange and chemical reaction to take place, and a positive electrode made of a porous material to provide a site where chemical reaction occurs while each electrode electrolyte flows ( 112) and a cathode electrode 113, and a positive electrode current collector plate 114 and a negative electrode current collector plate 115 having conductivity so that electricity can be supplied to the outside. The positive electrode 112 and the negative electrode 113 so as to prevent the positive electrode 112 and the negative electrode 113 from directly contacting the positive electrode current collector plate 114 and the negative electrode current collector plate 115 and to be electrically energized at the same time. ) And the positive electrode current collector plate 114 and the negative electrode current collector plate 115, respectively, the separation plate 116 is disposed.

Redox To increase the output of the redox flow battery, a series stacked structure or a stacked stacked structure in which the battery cells 100 are stacked is used.

The series stacked structure has an advantage in that the structure inside the cell is simple and the output can be easily increased because the anode and the cathode are repeated to cross each other, but as the number of battery cells stacked increases, a potential difference between the cell and the cell occurs. Thus, the efficiency due to the shunt current flowing along the electrolyte flow path and the possibility of damage inside the cell are increased.

On the other hand, the parallel stacked structure is a structure in which adjacent cells face the same poles to each other, so that each cell has an electrical potential that is equal. The parallel stacked structure has a structure in which shunt current is unlikely to occur because the electrical potential is equal for each cell, but the structure inside the cell is complicated because adjacent cells face the same pole. In addition, since two current collector plates are required for each cell, there is a disadvantage in that it is complicated to electrically connect to an external circuit. In addition, there is a possibility that an ohmic loss occurs because the amount of current compared to the output increases.

The present invention has been devised to improve the problems as described above, by reducing the generation of shunt current inside the battery cell where the electrolytic reaction occurs, improves the efficiency of the battery, simplifies the structure, and external circuits. It is an object of the present invention to provide a battery cell for a redox flow battery in which a series-parallel structure is mixed to facilitate connection.

A battery cell for a redox flow battery in which a series-parallel structure is mixed according to an aspect of the present invention, a first unit cell having an anode and a cathode, and adjacent to the first unit cell, wherein the anode is the first unit cell A first serial module including a first adjacent unit cell disposed in series adjacent to the cathode; A second serial module including a second unit cell having an anode and a cathode, and a second adjacent unit cell disposed adjacent to the second unit cell and disposed in series such that a cathode is adjacent to an anode of the second unit cell; The second serial module is disposed in parallel with respect to the first serial module so that the negative electrode of the second unit cell is adjacent to the negative electrode of the first adjacent unit cell, and the first serial module is disposed outside the first serial module. Positive electrode current collector plate; A second anode current collector plate disposed outside the second series module; And an intermediate current collector plate for the negative electrode disposed between the first and second serial modules.

In addition, it is preferable to include a common positive electrode current collector plate connecting the first positive electrode current collector plate and the second positive electrode current collector plate to each other.

In addition, the first serial module is disposed between the first unit cell and the first adjacent unit cell, an anode is disposed adjacent to the negative electrode of the first unit cell, and a negative electrode is the positive electrode of the first adjacent unit cell. It is preferable to further include a first additional unit cell arranged in series so as to be disposed adjacent to.

In addition, the second serial module is disposed between the second unit cell and the second adjacent unit cell, a negative electrode is disposed adjacent to the positive electrode of the second unit cell, and a positive electrode is a negative electrode of the second adjacent unit cell. It is preferable to further include a second additional unit cell arranged in series so as to be disposed adjacent to.

A battery cell for a redox flow battery in which a series-parallel structure is mixed according to another aspect of the present invention, a first unit cell having an anode and a cathode, and adjacent to the first unit cell, wherein the cathode is the first unit cell A first serial module including a first adjacent unit cell disposed in series adjacent to the anode; A second serial module including a second unit cell having an anode and a cathode, and a second adjacent unit cell disposed adjacent to the second unit cell and arranged in series such that an anode is adjacent to the cathode of the second unit cell; The second serial module is disposed in parallel with respect to the first serial module so that the positive electrode of the second unit cell is adjacent to the positive electrode of the first adjacent unit cell, and the first serial module is disposed outside the first serial module. Cathode current collector plate; A second cathode current collector plate disposed outside the second series module; And an intermediate current collector plate for positive electrodes disposed between the first and second series modules.

In addition, it is preferable to include a common negative electrode current collector plate connecting the first negative electrode current collector plate and the second negative electrode current collector plate to each other.

In addition, the first serial module is disposed between the first unit cell and the first adjacent unit cell, a negative electrode is disposed adjacent to the positive electrode of the first unit cell, and a positive electrode is a negative electrode of the first adjacent unit cell. It is preferable to further include a first additional unit cell arranged in series so as to be disposed adjacent to.

In addition, the second serial module is disposed between the second unit cell and the second adjacent unit cell, an anode is disposed adjacent to the negative electrode of the second unit cell, and a negative electrode is the positive electrode of the second adjacent unit cell. It is preferable to further include a second additional unit cell arranged in series so as to be disposed adjacent to.

A battery cell for a redox flow battery in which a series-parallel structure according to the present invention is mixed, the battery cell is arranged by mixing a series and a parallel structure, thereby reducing the occurrence of shunt current inside the battery cell in which an electrolytic reaction occurs. It improves the efficiency, simplifies the structure, and provides an effect of facilitating connection with external circuits.

1 is a view schematically showing a general redox flow battery,
2 is a view showing a battery cell stacked in series;
Figure 3 is a view showing a battery cell stacked in parallel,
4 is a view showing a battery cell for a redox flow battery according to an embodiment of the present invention,
5 is a view showing a battery cell for a redox flow battery according to another embodiment of the present invention,
6 is a view showing a battery cell for a redox flow battery according to another embodiment of the present invention,
7 is a view showing a battery cell for a redox flow battery according to another embodiment of the present invention.

Hereinafter, various embodiments of the present invention will be described in connection with the accompanying drawings. Various embodiments of the present invention may have various modifications and various embodiments, and specific embodiments are illustrated in the drawings and related detailed descriptions are described. However, this is not intended to limit the various embodiments of the present invention to specific embodiments, and should be understood to include all modifications and/or equivalents or substitutes included in the spirit and scope of the various embodiments of the present invention. In connection with the description of the drawings, similar reference numerals have been used for similar elements.

Expressions such as “comprises” or “can include” that may be used in various embodiments of the present invention indicate the existence of a corresponding function, operation, or component that has been invented, and additional one or more functions, operations, or The components and the like are not limited. Further, in various embodiments of the present invention, terms such as “include” or “have” are intended to designate the existence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, It should be understood that one or more other features or numbers, steps, operations, components, parts, or combinations thereof are not excluded in advance.

When it is stated that an element is "connected" to another element, the other element may be directly connected to the other element, but another new element between the other element and the other element It should be understood that may exist. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it will be understood that no other new component exists between the component and the other components. You should be able to.

Terms used in various embodiments of the present invention are only used to describe specific day embodiments, and are not intended to limit the various embodiments of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person skilled in the art to which various embodiments of the present invention pertain.

Terms, such as those defined in a commonly used dictionary, should be interpreted as having meanings consistent with meanings in the context of related technologies, and are ideally or excessively formal unless explicitly defined in various embodiments of the present invention. It is not interpreted as meaning.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 is a view schematically showing a general redox flow battery, and FIG. 4 is a view showing a battery cell for a redox flow battery according to an embodiment of the present invention.

The battery cell according to the present invention is used in a redox flow battery. First, a configuration of a general redox flow battery will be described with reference to FIG. 1. The redox flow battery 100 includes a battery cell 110, an electrolyte storage tank 120, and an electrolyte passage 130.

The battery cell (battery cell) 110 is a configuration in which charging and discharging occurs through the electrolyte, the ion exchange membrane 111, the positive electrode 112, the negative electrode 113, the positive electrode current collector plate 114, the negative electrode current collector plate 115 , The separation plate 116 is included.

The ion exchange membrane 111 is made of a membrane capable of ion exchange so that a chemical reaction occurs. The positive electrode 112 and the negative electrode 113 are disposed on both sides of the ion exchange membrane 111, and each pole electrolyte is made of a porous material, and is provided as a site where a chemical reaction occurs. The positive electrode current collector plate 114 and the negative electrode current collector plate 115 are provided to conduct electricity to the outside. The separation plate 116 is disposed between the positive electrode 112 and the positive electrode current collector plate 114 and between the negative electrode 113 and the negative electrode current collector plate 115 to prevent the electrolyte from directly contacting the current collector plate. At the same time, it is provided to energize electricity.

The electrolyte storage tank 120 is provided to supply the electrolyte to the battery cell 110. The electrolyte storage tank 120 is a positive electrode electrolyte storage tank 121 for storing the positive electrode electrolyte (121a) supplied to the positive electrode, and the negative electrode electrolyte storage tank (122a) for storing the negative electrode electrolyte (122a) supplied to the negative electrode ( 122).

The electrolyte passage 130 is provided as a passage through which the electrolyte is circulated. The electrolyte passage 130 includes a first electrolyte passage 131 and a second electrolyte passage 132.

The first electrolyte passage 131 is a passage through which the electrolyte is circulated by connecting the electrolyte storage tank 121 for the positive electrode and the battery cell 110. The first electrolyte passage 131 is a first supply passage connecting the electrolyte storage tank 121 for the positive electrode and the battery cell 110 to supply the positive electrode electrolyte 121a to the battery cell 110. (1311), a first recovery flow path (1312) connecting the battery cell 110 and the electrolyte storage tank (121) for the positive electrode to recover the positive electrode electrolyte (121a) to the electrolyte storage tank (121) for the positive electrode ). The positive electrode electrolyte solution 121a supplied to the positive electrode 112 is again passed through the electrolyte storage tank 121 for the positive electrode, the first supply passage 1311, the battery cell 110, and the first recovery passage 1312. It is circulated as it enters the electrolyte storage tank 121 for the positive electrode.

The second electrolyte passage 132 is a passage through which the electrolyte is circulated by connecting the electrolyte storage tank 122 for the negative electrode and the battery cell 110. The second electrolyte passage 132 is a second supply passage connecting the electrolyte storage tank 122 and the battery cell 110 for the cathode in order to supply the cathode electrolyte 122a to the battery cell 110. 1322 and a second recovery passage 1322 connecting the battery cell 110 and the electrolyte storage tank 122 for the cathode to recover the cathode electrolyte 122a to the electrolyte storage tank 122 for the cathode ). The negative electrode electrolyte solution 122a supplied to the negative electrode 113 is again passed through the electrolyte storage tank 122 for the negative electrode, the second supply channel 1321, the battery cell 110, and the second recovery channel 1322. It is circulated as it enters the electrolyte storage tank 122 for the cathode. A pump or the like may be provided to circulate the positive electrolyte solution 121a and the negative electrolyte solution 122a, and since such a configuration is already known, a detailed description thereof will be omitted.

In the redox flow battery as described above, a redox flow battery battery cell in which a series-parallel structure is mixed according to an aspect of the present invention proposes a battery cell structure in which a series and a parallel structure are mixed.

Specifically, referring to FIG. 4, a battery cell for a redox flow battery in which a series-parallel structure according to an aspect of the present invention is mixed includes a first series module 10, a second series module 20, and a first cathode collector. It includes a front plate 30, a second positive electrode current collector plate 40, and an intermediate current collector plate 50 for the negative electrode.

The first serial module 10 includes a first unit cell 11 and a first adjacent unit cell 12. Each of the first unit cell 11 or the first adjacent unit cell 12 is a minimum unit in which charging and discharging occur, and includes an anode 101 and a cathode 102, respectively.

Specifically, the first unit cell 11 and the second adjacent unit cell 12 include an anode 101, a cathode 102, an ion exchange membrane 103, and a separator 104. The positive electrode 101, the negative electrode 102, the ion exchange membrane 103, and the configuration of the separator 104, the positive electrode 112, the negative electrode 113, the ion exchange membrane 111, and the separator plate of Figure 1 ( 116), the detailed description thereof will be omitted.

4, the first unit cell 11 is disposed such that the anode 101 is located on the outermost side. The first adjacent unit cell 12 is disposed adjacent to the first unit cell 11, and an anode 101 of the first adjacent unit cell 12 is a negative electrode of the first unit cell 11 ( 102). Therefore, according to the present embodiment, the first serial module 10 has two unit cells (first unit cell 11 and first adjacent unit cell 12) having substantially the same configuration in series with each other. It has a structure.

The second serial module 20 includes a second unit cell 21 and a second adjacent unit cell 22. The second unit cell 21 or the second neighboring unit cell 22 is the smallest unit in which charging and discharging occur, as in the first unit cell 11 or the first neighboring unit cell 12, respectively. 101 and a cathode 102, respectively.

Each structure of the second unit cell 21 or the second adjacent unit cell 22 is substantially the same as the first unit cell 11 or the first adjacent unit cell 12. That is, the second unit cell 21 or the second adjacent unit cell 22 includes an anode 101, a cathode 102, an ion exchange membrane 103, and a separator 104. The configuration of the anode 101, the cathode 102, the ion exchange membrane 103, and the separation plate 104 of the second unit cell 21 or the second adjacent unit cell 22 is the anode 112 of FIG. ), the cathode 113, the ion exchange membrane 111, and the separation plate 116 are substantially the same, so detailed description thereof will be omitted.

4, the second unit cell 21 is disposed adjacent to the first adjacent unit cell 12 of the first serial module 10, and the second adjacent unit cell 22 is the outermost side. Is placed on. In particular, the anode 101 of the second adjacent unit cell 22 is arranged to be positioned on the outermost side.

The second adjacent unit cell 22 is disposed adjacent to the second unit cell 21, wherein the cathode 102 of the second adjacent unit cell 22 is the anode of the second unit cell 21 ( 101). Therefore, according to the present embodiment, the second serial module 20, like the first serial module 10, two unit cells having substantially the same configuration (second unit cell 21 and second) Adjacent unit cells 22] have a structure in which they are arranged in series with each other.

According to the present invention, the first serial module 10 and the second serial module 20 are arranged in parallel with each other. Specifically, the second unit cell 21 of the second serial module 20 is disposed adjacent to the first adjacent unit cell 12 of the first serial module 10, the second unit cell 21 ), the cathode 102 is disposed adjacent to the cathode 102 of the first adjacent unit cell 12.

The first positive electrode current collector plate 30, the second positive electrode current collector plate 40, and the negative electrode current collector plate 50 are provided to energize electricity to the outside. For example, the first and second positive electrode current collector plates 30 and 40 and the negative electrode current collector plates 50 are provided as terminals for applying external power when charging the redox flow battery.

The first positive electrode current collector plate 30 is disposed outside the first serial module 10. Specifically, according to this embodiment, the first positive electrode current collector plate 30 is disposed facing the positive electrode 101 of the first unit cell 11.

The second positive electrode current collector plate 30 is disposed outside the second serial module 20. Specifically, according to the present embodiment, the second positive electrode current collector plate 40 is disposed facing the positive electrode 101 of the second adjacent unit cell 22.

The negative electrode current collector plate 50 is disposed between the first and second serial modules 10 and 20. As described above, when the first serial module 10 and the second serial module 20 are disposed adjacent to each other, the cathode 102 and the second unit cell of the first adjacent unit cell 12 are Since the negative electrode 102 of (21) is disposed facing each other, the intermediate current collector plate for the negative electrode between the negative electrode 102 of the first adjacent unit cell 12 and the negative electrode 102 of the second unit cell 21 50 is placed.

According to an embodiment of the present invention, a common positive electrode current collector plate 60 is included.

4, the common positive electrode current collector plate 60 connects the first positive electrode current collector plate 30 and the second positive electrode current collector plate 40 to each other. When energizing electricity to the outside, any point of the common positive electrode current collector plate 60 may be connected.

5 is a view showing a battery cell for a redox flow battery according to another embodiment of the present invention. In the battery cell according to the embodiment of FIG. 5, the same reference numerals are assigned to components having the same function as the embodiment of FIG. 4, and detailed description thereof will be omitted. 5, compared with FIG. 4, the first serial module 10 further includes a first additional unit cell 13, and the second serial module 20 is a second additional unit cell 23. It is different to further include. Hereinafter, the difference will be described in detail.

According to this embodiment, the first serial module 10 further includes a first additional unit cell 13. The first additional unit cell 13 is disposed between the first unit cell 11 and the first adjacent unit cell 12. The first additional unit cell 13 itself has the same configuration as that of the first unit cell 11 or the first adjacent unit cell 12.

The positive electrode 101 of the first additional unit cell 13 is disposed adjacent to the negative electrode 102 of the first unit cell 11, and the negative electrode 102 of the first additional unit cell 13 is the It is disposed adjacent to the anode 101 of the first adjacent unit cell 12. The first additional unit cell 13 is arranged in series in relation to the first unit cell 11 and the first adjacent unit cell 12.

The second serial module 20 further includes the second additional unit cell 23. The second additional unit cell 23 is disposed between the second unit cell 21 and the second adjacent unit cell 22. The second additional unit cell 23 itself has the same configuration as that of the second unit cell 21 or the second adjacent unit cell 22.

The cathode 102 of the second additional unit cell 23 is disposed adjacent to the anode 101 of the second unit cell 21, and the anode 101 of the second additional unit cell 23 is the It is disposed adjacent to the cathode 102 of the second adjacent unit cell 22. The second additional unit cell 23 is arranged in series in relation to the second unit cell 21 and the second adjacent unit cell 22.

On the other hand, Figure 6 is a view showing a battery cell for a redox flow battery according to another embodiment of the present invention. In the embodiment of Fig. 6, the same reference numerals are assigned to the components having the same functions as those of Fig. 4, and detailed descriptions thereof are omitted.

The battery cell for a redox flow battery according to the present embodiment is for a first series module 10, a second series module 20, a first cathode current collector plate 70, a second cathode current collector plate 80, and an anode It includes an intermediate current collector plate (90).

The first serial module 10 includes a first unit cell 11 and a first adjacent unit cell 12, and is substantially the same as the first serial module 10 in FIG. Specifically, the first unit cell 11 and the second adjacent unit cell 12 include an anode 101, a cathode 102, an ion exchange membrane 103, and a separator 104. In the first series module 10 according to the present embodiment, the arrangement of the anode 101 and the cathode 102 is different compared to the first series module 10 of FIG. 4.

6, the first unit cell 11 is disposed such that the cathode 102 is located on the outermost side. The first adjacent unit cell 12 is disposed adjacent to the first unit cell 11, and the negative electrode 102 of the first adjacent unit cell 12 is the positive electrode of the first unit cell 11 ( 101). Therefore, according to the present embodiment, the first serial module 10 has two unit cells (first unit cell 11 and first adjacent unit cell 12) having substantially the same configuration in series with each other. It has a structure.

The second serial module 20 includes a second unit cell 21 and a second adjacent unit cell 22, and is substantially the same as the second serial module 20 in FIG. Each structure of the second unit cell 21 or the second adjacent unit cell 22 is substantially the same as the first unit cell 11 or the first adjacent unit cell 12. That is, the second unit cell 21 or the second adjacent unit cell 22 includes an anode 101, a cathode 102, an ion exchange membrane 103, and a separator 104. In the second series module 20 according to the present embodiment, the arrangement of the anode 101 and the cathode 102 is different compared to the second series module 20 of FIG. 4.

6, the second unit cell 21 is disposed adjacent to the first adjacent unit cell 12 of the first serial module 10, and the cathode of the second adjacent unit cell 22 102 is disposed so as to be located on the outermost side.

The second adjacent unit cell 22 is disposed adjacent to the second unit cell 21, wherein the anode 101 of the second adjacent unit cell 22 is the cathode of the second unit cell 21 ( 102). Therefore, according to the present embodiment, the second serial module 20, like the first serial module 10, two unit cells having substantially the same configuration (second unit cell 21 and second) Adjacent unit cells 22] have a structure in which they are arranged in series with each other.

According to the present invention, the first serial module 10 and the second serial module 20 are arranged in parallel with each other. Specifically, the second unit cell 21 of the second serial module 20 is disposed adjacent to the first adjacent unit cell 12 of the first serial module 10, the second unit cell 21 ), the anode 101 is disposed adjacent to the anode 101 of the first adjacent unit cell 12.

The first negative electrode current collector plate 70, the second negative electrode current collector plate 80, and the positive electrode current collector plate 90 are provided to conduct electricity to the outside. For example, the first and second negative electrode current collector plates 60 and 70 and the intermediate current collector plates 90 for positive electrodes are provided as terminals for applying external power when charging the redox flow battery.

The first cathode current collector plate 70 is disposed outside the first serial module 10. Specifically, according to this embodiment, the first negative electrode current collector plate 70 is disposed facing the negative electrode 102 of the first unit cell 11.

The second cathode current collector plate 80 is disposed outside the second serial module 20. Specifically, according to this embodiment, the second cathode current collector plate 80 is disposed facing the cathode 102 of the second adjacent unit cell 22.

The positive electrode current collector plate 90 is disposed between the first and second serial modules 10 and 20. As described above, when the first serial module 10 and the second serial module 20 are disposed adjacent to each other, the anode 101 and the second unit cell of the first adjacent unit cell 12 are Since the anode 101 of (21) is disposed facing each other, the intermediate current collector plate for the cathode between the anode 101 of the first adjacent unit cell 12 and the anode 101 of the second unit cell 21 50 is placed.

According to an embodiment of the present invention, the common cathode current collector plate 140 is included.

As illustrated in FIG. 6, the common cathode current collector plate 140 connects the first cathode current collector plate 70 and the second cathode current collector plate 80 to each other. When energizing electricity to the outside, any point of the common cathode current collector plate 140 may be connected.

7 is a view showing a battery cell for a redox flow battery according to another embodiment of the present invention. In the battery cell according to the embodiment of FIG. 7, the same reference numerals are assigned to components having the same function as the embodiment of FIG. 6, and detailed descriptions thereof will be omitted. In the embodiment of FIG. 7, compared to FIG. 6, the first serial module 10 further includes a first additional unit cell 13, and the second serial module 20 is a second additional unit cell 23 It is different to further include. Hereinafter, the difference will be described in detail.

According to this embodiment, the first serial module 10 further includes a first additional unit cell 13. The first additional unit cell 13 is disposed between the first unit cell 11 and the first adjacent unit cell 12. The first additional unit cell 13 itself has the same configuration as that of the first unit cell 11 or the first adjacent unit cell 12.

The cathode 102 of the first additional unit cell 13 is disposed adjacent to the anode 101 of the first unit cell 11, and the anode 101 of the first additional unit cell 13 is the It is disposed adjacent to the cathode 102 of the first adjacent unit cell 12. The first additional unit cell 13 is arranged in series in relation to the first unit cell 11 and the first adjacent unit cell 12.

The second serial module 20 further includes the second additional unit cell 23. The second additional unit cell 23 is disposed between the second unit cell 21 and the second adjacent unit cell 22. The second additional unit cell 23 itself has the same configuration as that of the second unit cell 21 or the second adjacent unit cell 22.

The positive electrode 101 of the second additional unit cell 23 is disposed adjacent to the negative electrode 102 of the second unit cell 21, and the negative electrode 102 of the second additional unit cell 23 is the It is disposed adjacent to the anode 101 of the second adjacent unit cell 22. The second additional unit cell 23 is arranged in series in relation to the second unit cell 21 and the second adjacent unit cell 22.

Hereinafter, the action or effect of the redox flow battery cell according to the above configuration will be described in detail. Operations and effects of the embodiments of FIGS. 4 and 5 will be described, and operations and effects of the embodiments of FIGS. 6 and 7 are the same as those of FIGS. 4 and 5.

In order to understand the effect of the battery cell for a redox flow battery according to the present invention, first, the advantages and disadvantages of the series and parallel structures according to FIGS. 2 and 3 will be described.

2 shows a battery cell structure in which unit cells are stacked in series. 2, the anode 112 and the cathode 113 of the battery cell 110 are alternately stacked. Since the series stacked structure is configured to repeat the positive electrode 112 and the negative electrode 113 in the same manner, it is simple to configure a flow path inside the battery cell 110, and the positive electrode current collector plate 114 and the negative electrode exposed to the outside The current collector plate 115 may be provided on each side of the battery cell 110, so that the configuration can be simplified.

However, since the first supply flow path 1311 of the first electrolyte flow path 131 and the second supply flow path 1321 of the second electrolyte flow path 132 are commonly connected to each battery cell 110, the flow through the flow path Shunt current occurs. That is, the plurality of first branch flow paths 1313 branch from the first supply flow path 1311, and the plurality of second branch flow paths 1323 branch from the second supply flow path 1321, so the first supply flow path (1311) or the second supply flow path 1321 is shared to generate a shunt current.

In addition, in the series stacked structure, the potential difference of one battery cell acts on both ends of the electrolyte passage each time a unit cell is added. At both ends of the electrolyte passage, a total potential difference of (number of stacked cells-1) x (potential difference for each battery cell) is generated, which is another factor inducing generation of shunt current. Shunt current reduces the efficiency of the battery and causes electrochemical damage inside the battery cell, so it is necessary to minimize it.

3 shows a battery cell structure in which unit cells are stacked in parallel. As shown in FIG. 3, the battery cells 110 are arranged such that the poles of the contact portions of the battery cells 110 coincide with the anode 102 or the cathode 103. Since each of the adjacent battery cells 110 faces the same pole, the structure in which the top and bottom are reversed when the battery cells 110 are continuously arranged is repeated. Therefore, the structure in which the electrolyte flows into the battery cell 110 becomes relatively complicated.

In addition, between each battery cell 110, the positive electrode current collector plate 114 and the negative electrode current collector plate 115 for connection with an external electric circuit are formed to protrude, thereby complicating the structure. To this end, the common cathode electrode 118 and the common anode electrode 117 may be configured, but each of the cathode current collector plates 115 must be connected to the common cathode electrode 118, and the common anode electrode 117 Since each of the positive electrode current collector plates 114 must be connected, there is still a disadvantage in that the internal structure is complicated.

The parallel stacked structure can suppress generation of a shunt current because no potential difference occurs on the electrolyte passage, but as described above, there is a limit to increase the number of battery cells 110 stacked because the internal flow path configuration is complicated. In addition, since the voltage does not increase and only the current increases, even if a battery cell having the same output is produced, there is a disadvantage in that resistance loss is relatively large.

The redox flow battery cell according to an embodiment of the present invention has a structure in which a series structure and a parallel structure are mixed, thereby minimizing the disadvantages of the series and parallel structures, respectively, and providing an effect of maximizing the advantage.

According to the battery cell according to the present invention, since the unit cells constituting the first serial module 10 and the unit cells constituting the second serial module 20 are connected in series, the effect when the unit cells are connected in series Provides That is, the output of the redox flow battery may be increased by the first serial module 10 and the second serial module 20. In addition, the first and second series modules 10 and 20 are each composed of two or three to reduce the potential difference, thereby minimizing the generation of shunt current.

In addition, since the first series module 10 and the second series module 20 are connected in parallel, the generation of shunt current is suppressed, and the number of current collector plates can be significantly reduced, so that the battery cell structure can be simplified. . In addition, since the number of current collector plates is drastically reduced, the number of anode current collector plates or cathode current collector plates connected to the common current collector plate is reduced, thereby simplifying the structure of the battery cell.

The present invention has been described in detail with reference to preferred embodiments, but the present invention is not limited to the above embodiments, and various modifications may be provided without departing from the scope of the present invention.

10... 1st serial module 11... 1st unit cell
12... 1st adjacent unit cell 13... 1st additional unit cell
20... second serial module 21... second unit cell
22... 2nd adjacent unit cell 23... 2nd additional unit cell
101... positive 102... negative
103... ion exchange membrane 104... separation plate
30... 1st positive electrode current collector plate 40... 2nd positive electrode current collector plate
50... Medium current collector plate for negative electrode 60... Common positive electrode current collector plate
70... 1st cathode current collector plate 80... 2nd cathode current collector plate
90... Medium current collector plate for anode 140... Common cathode current collector plate
100.. Redox flow battery

Claims (8)

A first unit cell 11 having an anode and a cathode, and a first adjacent unit disposed adjacent to the first unit cell 11 and arranged in series such that an anode is adjacent to the cathode of the first unit cell 11 A first serial module 10 including a cell 12;
A second unit cell 21 having an anode and a cathode and a second adjacent unit disposed adjacent to the second unit cell 21 and arranged in series so that a cathode is adjacent to the anode of the second unit cell 21 A second serial module 20 including a cell 22;
The second serial module 20 is disposed in parallel with respect to the first serial module 10 so that the negative electrode of the second unit cell 21 is adjacent to the negative electrode of the first adjacent unit cell 12,
A first anode current collector plate 30 disposed outside the first serial module 10;
A second anode current collector plate 40 disposed outside the second serial module 20; And
A battery cell for a redox flow battery in which a series-parallel structure is mixed, comprising; an intermediate current collector plate 50 for a negative electrode disposed between the first and second serial modules 10 and 20. According to claim 1,
A battery cell for a redox flow battery in which a parallel and parallel structure is mixed, comprising a common positive electrode current collector plate (60) connecting the first positive electrode current collector plate (30) and the second positive electrode current collector plate (40) to each other. According to claim 1,
The first serial module 10 is disposed between the first unit cell 11 and the first adjacent unit cell 12, an anode is disposed adjacent to the negative electrode of the first unit cell 11, A battery cell for a redox flow battery in which a series-parallel structure is mixed, further comprising a first additional unit cell 13 arranged in series so that a negative electrode is disposed adjacent to the positive electrode of the first adjacent unit cell 12. . According to claim 1,
The second serial module 20 is disposed between the second unit cell 21 and the second adjacent unit cell 22, and a negative electrode is disposed adjacent to the positive electrode of the second unit cell 21. A battery cell for a redox flow battery in which a series-parallel structure is mixed, further comprising a second additional unit cell 23 arranged in series so that an anode is disposed adjacent to a cathode of the second adjacent unit cell 22. . A first unit cell 11 having an anode and a cathode, and a first adjacent unit disposed adjacent to the first unit cell 11 and having a cathode arranged in series so as to be adjacent to the anode of the first unit cell 11 A first serial module 10 including a cell 12;
A second unit cell 21 having an anode and a cathode, and a second adjacent unit disposed adjacent to the second unit cell 21 and arranged in series such that an anode is adjacent to the cathode of the second unit cell 21 A second serial module 20 including a cell 22;
The second serial module 20 is disposed in parallel with respect to the first serial module 10 so that the positive electrode of the second unit cell 21 is adjacent to the positive electrode of the first adjacent unit cell 12,
A first cathode current collector plate (70) disposed outside the first serial module (10);
A second cathode current collector plate 80 disposed outside the second serial module 20; And
A battery cell for a redox flow battery in which a series-parallel structure is mixed, comprising; an intermediate current collector plate 90 for a positive electrode disposed between the first and second serial modules 10 and 20. The method of claim 5,
A battery cell for a redox flow battery having a series-parallel structure mixed therein, comprising a common cathode current collector plate (140) connecting the first cathode current collector plate (70) and the second cathode current collector plate (80) to each other. The method of claim 5,
The first serial module 10 is disposed between the first unit cell 11 and the first adjacent unit cell 12, a negative electrode is disposed adjacent to the positive electrode of the first unit cell 11, A battery cell for a redox flow battery in which a series-parallel structure is mixed, further comprising a first additional unit cell 13 arranged in series so that an anode is disposed adjacent to a cathode of the first adjacent unit cell 12. . The method of claim 5,
The second serial module 20 is disposed between the second unit cell 21 and the second adjacent unit cell 22, and an anode is disposed adjacent to the cathode of the second unit cell 21. A battery cell for a redox flow battery in which a series-parallel structure is mixed, further comprising a second additional unit cell 23 arranged in series so that a negative electrode is disposed adjacent to the positive electrode of the second adjacent unit cell 22. .

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