Flow battery with flow channel of asymmetric structure

Abstract

The utility model discloses a flow battery with a flow channel of an asymmetric structure, and relates to the technical field of flow batteries. A liquid inlet flow channel and a liquid outlet flow channel are formed in one surface of a plate frame; each of the liquid inlet flow channel and the liquid outlet flow channel comprises a distribution flow channel, a public flow channel and a flow limiting channel; a distribution flow channel of the liquid inlet flow channel is divided into three areas from right to left, the distribution opening direction of the first area is towards the right side, and the sectional area is X; the distribution opening of the second area is vertical, and the sectional area is 2X; the distribution opening of the third area is deviated to the left side, and the sectional area is 2X; all distribution openings of a distribution flow channel of the liquid outlet flow channel are vertical in direction, and the sectional area is 10X. According to the flow battery with the flow channel with the asymmetric structure, the structure of the liquid inlet flow channel is gradually changed, so that the electrolyte entering the electrode has better distribution uniformity; the structure of the liquid outlet flow channel is relatively simple, the flow resistance is reduced, and the electrolyte after the reaction in the electric pile rapidly leaves the electric pile.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of liquid flow battery, especially relates to a liquid flow battery with asymmetric structure flow channel. BACKGROUND

[0002] The liquid flow battery is a new energy storage technology route, and its principle is that positive and negative electrode liquids are stored in positive and negative liquid storage tanks, and electrolyte enters the stack through pipelines under the action of a circulating pump. The stack is a power unit, which mainly comprises a plate frame, a bipolar plate, a diaphragm and carbon felt. Ions in the electrolyte on both sides of the diaphragm move directionally to generate an electric current, and the bipolar plate collects and conducts the electric current to realize the conversion between chemical energy and electric energy.

[0003] The electrolyte enters the stack through pipelines, first enters the liquid inlet common flow channel of the stack, then uniformly flows into the liquid inlet flow channel of each plate frame, and finally enters the carbon felt through the distribution flow channel, and the electrochemical reaction occurs on the carbon felt. The electrolyte after the reaction flows into the liquid outlet flow channel through the distribution flow channel, and finally enters the liquid outlet common flow channel, and then flows out of the stack through pipelines and returns to the liquid storage tank.

[0004] The distribution flow channel undertakes a very critical task, and its core function is to make the electrolyte entering the carbon felt as evenly distributed as possible. Assuming that the carbon felt is a uniform porous medium and the flow rate at the carbon felt inlet can be uniformly distributed, the flow rate difference of the electrolyte inside the carbon felt will be significantly reduced, and at the same time, the flow dead zone area of the electrolyte will be effectively reduced.

[0005] The design of the flow channel structure of the liquid flow battery needs to consider two tasks: ensuring uniform distribution of electrolyte and reducing flow resistance. At present, the flow channel structure design of the all-vanadium liquid flow battery has various forms, but the inlet and outlet flow channels of the plate frame are mostly symmetrical structures. This leads to the fact that in practice, it is often difficult to ensure uniform distribution of electrolyte while achieving the desired reduction of flow resistance. Especially when the number of series-connected cells in the stack increases significantly, the flow resistance of the stack increases sharply, at which time the key of the flow channel structure design becomes more prominent, and the design level is directly related to the performance and stability of the liquid flow battery.

[0006] In the liquid flow battery, the assembly method of the stack corresponds to the flow channel design. A reasonable assembly method can make the components such as the polar plate, the diaphragm and the electrode cooperate closely to ensure no leakage and good contact. Good flow channel design and assembly method make the liquid flow battery operate stably and have better performance.

[0007] In order to solve the above problems, we propose a liquid flow battery with asymmetric structure flow channel. SUMMARY

[0008] The utility model discloses a liquid flow battery with asymmetric structure flow channel, solve the current problem.

[0009] To solve the above technical problem, the utility model is realized through the following technical schemes:

[0010] The utility model discloses a liquid flow battery with asymmetric structure flow channel, including electric pile, the electric pile assembly process is from left to right in proper order end plate, liquid inlet and outlet plate, copper plate, polar plate, plate frame, flow channel cover plate, electrode, diaphragm, electrode, flow channel cover plate, plate frame, polar plate, copper plate, liquid inlet and outlet plate, end plate, finally again with fastener fastening together all electric pile components, form a complete electric pile structure, one surface of plate frame is equipped with liquid inlet flow channel and liquid outlet flow channel, liquid inlet flow channel and liquid outlet flow channel all include distribution flow channel, public flow channel and flow limiting passage,

[0011] The distribution flow channel of liquid inlet flow channel is divided into three regions from right to left, and the distribution port direction of the first region is deviated to the right side, and the cross-sectional area is X, the distribution port direction of the second region is vertical, and the cross-sectional area is 2X, and the distribution port direction of the third region is deviated to the left side, and the cross-sectional area is 2X,

[0012] The distribution flow channel of liquid outlet flow channel is vertical, and the cross-sectional area is 10X,

[0013] Two plate frames, two flow channel cover plates, two electrodes and one diaphragm form a single cell, and the single cells are connected by polar plates.

[0014] Further, in the electric pile assembly process, the liquid outlet flow channel is upward, the liquid inlet flow channel is downward, and the flow channel cover plate with a large area cooperates with the flow channel.

[0015] Further, the liquid inlet flow channel and the liquid outlet flow channel are asymmetric structures, and the distribution flow channel of the liquid inlet flow channel is an asymmetric structure.

[0016] Further, the distribution flow channel, the public flow channel and the flow limiting passage of the liquid inlet flow channel are communicated, and the distribution flow channel, the public flow channel and the flow limiting passage of the liquid outlet flow channel are communicated.

[0017] The utility model has the following beneficial effects:

[0018] The utility model discloses a liquid flow battery with asymmetric structure flow channel, the structure of liquid inlet flow channel is designed gradually, and the electrolyte entering the electrode has good distribution uniformity, the structure of liquid outlet flow channel is relatively simple, the flow resistance is reduced, and the electrolyte reacting in the electric pile can quickly leave the electric pile.

[0019] Of course, any product implementing the utility model does not necessarily need to achieve all the advantages mentioned above. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed for the description of the embodiments will be briefly introduced as follows. Obviously, the drawings described in the following are only some of the embodiments of the present application, and all other drawings obtained by those skilled in the art without creative labor based on the embodiments of the present application shall fall within the scope of protection of the present application.

[0021] Figure 1 It is a schematic diagram of the overall structure of the stack in the present application.

[0022] Figure 2 It is a schematic diagram of the structure of the plate frame in the present application.

[0023] Figure 3 It is a schematic diagram of the first area distribution port structure in the present application.

[0024] Figure 4 It is a schematic diagram of the second area distribution port structure in the present application.

[0025] Figure 5 It is a schematic diagram of the third area distribution port structure in the present application.

[0026] Figure 6 It is a schematic diagram of the liquid outlet flow channel distribution port structure in the present application.

[0027] Figure 7 It is an exploded view of the stack assembly in the present application.

[0028] In the drawings, the component list represented by each reference numeral is as follows:

[0029] 1, liquid inlet flow channel; 2, liquid outlet flow channel; 3 / 4, distribution flow channel; 5 / 6, common flow channel; 7 / 8, flow limiting channel. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor shall fall within the scope of protection of the present application.

[0031] In the description of the present application, it should be understood that the terms "upper", "middle", "outer", "inner" and the like indicate the orientation or positional relationship, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the indicated components or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0032] In the description of the utility model, it is to explain, unless otherwise definite and limited, the term "installation" "is provided with" "connection" and so on, should be broad sense understanding, for example "connection", can be fixed connection, also can be detachable connection, or integral connection;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be the intercommunication of two elements inside.For the ordinary skilled person in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.

[0033] Please refer to Figures 1-7 As shown in the utility model is a kind of liquid flow battery with asymmetric structure flow channel, including electric pile, electric pile assembly process, from left to right, end plate, inlet and outlet liquid plate, copper plate, pole plate, plate frame, flow channel cover plate, electrode, diaphragm, electrode, flow channel cover plate, plate frame, pole plate, copper plate, inlet and outlet liquid plate, end plate, finally again using fastener to fasten all electric pile components together, form a complete electric pile structure, plate frame one surface is provided with inlet flow channel and outlet flow channel;Inlet flow channel and outlet flow channel all include distribution flow channel, common flow channel and flow limiting passage;

[0034] The distribution flow channel of inlet flow channel is divided into three regions from right to left, the first region distribution port direction deviates right side, cross-sectional area is X;The second region distribution port direction is vertical, cross-sectional area is 2X;The third region distribution port direction deviates left side, cross-sectional area is 2X;

[0035] The direction of all distribution ports of the distribution flow channel of outlet flow channel is vertical, and the cross-sectional area is 10X;

[0036] Two plate frames, two flow channel cover plates, two electrodes and a diaphragm form a single cell, and each single cell is connected with a pole plate.

[0037] In one embodiment, during the assembly of the electric pile, the outlet flow channel faces upwards, and the inlet flow channel faces downwards, and the large-area flow channel cover plate cooperates with the flow channel, so that the assembly difficulty of the electric pile is reduced, and the reliability of the cooperation of the internal components of the electric pile is improved.

[0038] In one embodiment, the inlet flow channel and the outlet flow channel are asymmetric structures, and the distribution flow channel of the inlet flow channel is an asymmetric structure.

[0039] In one embodiment, the distribution flow channel, the common flow channel and the flow limiting passage of the inlet flow channel are communicated, and the distribution flow channel, the common flow channel and the flow limiting passage of the outlet flow channel are communicated.

[0040] It needs to be further explained that the utility model discloses a kind of liquid flow battery with asymmetric structure flow channel, mainly including flow channel structure design, the electric pile of the utility model as shown in Figure 1 ;

[0041] As shown in Figure 2 , the flow channel design of plate frame is divided into liquid inlet flow channel design and liquid outlet flow channel design;Liquid inlet flow channel and liquid outlet flow channel are asymmetric structure, and the distribution flow channel of liquid inlet flow channel is asymmetric structure.In the process of electric pile assembly, liquid outlet flow channel is upward, and liquid inlet flow channel is downward, and the flow channel cover plate of mutual cooperation is a large flow channel cover plate.

[0042] Liquid inlet flow channel distribution flow channel design: from a side to b side, distribution flow channel is divided into three regions, the shape and cross-sectional area of distribution port gradually change, so that electrolyte is more evenly into electrode.

[0043] As shown in Figure 3 , the direction of the first region distribution port is inclined to a side, and the cross-sectional area is X;

[0044] As shown in Figure 4 , the direction of the second region distribution port is vertical, and the cross-sectional area is 2X;

[0045] As shown in Figure 5 , the direction of the third region distribution port is inclined to b side, and the cross-sectional area is 2X;

[0046] As shown in Figure 6 , the distribution flow channel design of liquid outlet flow channel: the shape of all distribution ports of distribution flow channel is simple, and the cross-sectional area is large, so as to reduce flow resistance and make electrolyte quickly leave the electric pile;All distribution ports are vertical, and the cross-sectional area is 10X;

[0047] As shown in Figure 7 , in the process of assembling the electric pile, from left to right, it is end plate, liquid inlet and outlet plate, copper plate, pole plate, plate frame, flow channel cover plate, electrode, diaphragm, electrode, flow channel cover plate, plate frame, pole plate, copper plate, liquid inlet and outlet plate, end plate, and finally all the electric pile components are fastened together by screw nut, to form a complete electric pile structure;A single cell is composed of two plate frames, two flow channel cover plates, two electrodes and a diaphragm, and each single cell is connected by cooperating pole plate.

[0048] In the description of the present application, the description of the terms "one embodiment", "example", "specific example" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0049] The preferred embodiments disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details and do not limit the utility model to the specific embodiments described. Obviously, according to the content of the description, many modifications and changes can be made. The description selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that the skilled in the art can well understand and utilize the utility model. The utility model is limited by the claims and the entire scope and equivalents thereof.

Claims

1. A flow battery with asymmetric structure flow channel, comprising a stack, in the process of assembling the stack, from left to right, there are end plate, inlet and outlet plate, copper plate, polar plate, plate frame, flow channel cover plate, electrode, diaphragm, electrode, flow channel cover plate, plate frame, polar plate, copper plate, inlet and outlet plate, end plate, and finally all the components of the stack are fastened together with fasteners to form a complete stack structure, characterized in that: The plate frame is provided with liquid inlet flow channel and liquid outlet flow channel on one surface; the liquid inlet flow channel and the liquid outlet flow channel each include distribution flow channel, common flow channel and flow limiting passage; The distribution flow channel of the liquid inlet flow channel is divided into three regions from right to left, the first region distribution port direction is deviated to the right side, the cross-sectional area is X; the second region distribution port direction is vertical, the cross-sectional area is 2X; the third region distribution port direction is deviated to the left side, the cross-sectional area is 2X; The distribution flow channel of the liquid outlet flow channel is all vertical, the cross-sectional area is 10X; Two pieces of the plate frame, two pieces of the flow channel cover plate, two pieces of the electrode and one piece of the diaphragm form a single cell, and each single cell is matched with the electrode plate connection.

2. The flow battery having a flow channel with asymmetric structure according to claim 1, characterized in that, During the assembly of the electric pile, the liquid outlet flow channel faces upward, the liquid inlet flow channel faces downward, and the flow channel is matched with the flow channel cover plate.

3. The flow battery having a flow channel with asymmetric structure of claim 1, wherein, The liquid inlet flow channel and the liquid outlet flow channel are asymmetric structures, and the distribution flow channel of the liquid inlet flow channel is an asymmetric structure.

4. The flow battery having a flow channel with asymmetric structure of claim 1, wherein, The distribution flow channel, the common flow channel and the flow limiting passage of the liquid inlet flow channel are communicated, and the distribution flow channel, the common flow channel and the flow limiting passage of the liquid outlet flow channel are communicated.

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