CN213936255U

CN213936255U - Flow battery plate frame

Info

Publication number: CN213936255U
Application number: CN202023213451.3U
Authority: CN
Inventors: 杨林; 李昂; 李晓蒙; 王含
Original assignee: Beijing Herui Energy Storage Technology Co ltd
Current assignee: Beijing Herui Energy Storage Technology Co ltd
Priority date: 2020-12-28
Filing date: 2020-12-28
Publication date: 2021-08-10
Anticipated expiration: 2030-12-28

Abstract

The utility model discloses a flow battery plate frame, including positive plate frame and negative plate frame, the surface structure of positive plate frame and negative plate frame are the mirror image each other, and the plate frame is the rectangle flat structure, and the entry and the export of electrolyte distribute according to the diagonal on the rectangle plate frame, and the electrolyte in the main flow passage is divided into two S type tributaries by the boss that divides into water, and the electrolyte in the S type runner has improved the resistance in the pile, reduces the leakage current; smooth bulges at the lower part of the water diversion boss prevent the turbulent flow when the branches converging face to face are mixed; further, the sheet frame still is provided with and keeps off the platform, keeps off between the platform adjacently, keeps off and forms the branch liquid platform with central buffer chamber border between the platform, divides the liquid bench to be provided with boss and concave station, and electrolyte is kept off the platform and is divided into a plurality of groups, is further mixed by crisscross boss and concave station, forms stable, the even electrolyte of velocity of flow, gets into the electrode chamber and participates in chemical reaction.

Description

Flow battery plate frame

Technical Field

The utility model belongs to the technical field of the redox flow battery energy storage, in particular to redox flow battery sheet frame.

Background

The power generation of renewable energy sources such as wind energy, solar energy and the like is influenced by factors such as time, day and night, seasons and the like, and has obvious discontinuous, unstable and uncontrollable unsteady characteristics. Therefore, the large-scale efficient energy storage technology is an important way for solving the unstable power generation of renewable energy sources. The flow battery has the characteristics of high safety, large energy storage scale, high efficiency, long service life and the like, and has good application prospect in the field of large-scale energy storage.

The plate frame of the cell stack is one of the core components of the entire energy storage system. The flow field design of the plate frame affects the efficiency of the electrochemical reaction in the stack, and particularly, the sealing design of the plate frame needs to isolate the external environment and prevent the liquid leakage of the positive and negative electrolytes in the stack. The processing difficulty of the surface characteristics of the plate frame can be directly fed back to the cost, and the processing modes which can be adopted include organic processing, mould pressing, injection molding and the like. Therefore, the structure of the plate frame is the key and the foundation of the flow battery system.

The plate frame in the prior art has the following problems:

1. the assembly of the cell stack is not considered, only one liquid inlet hole and one liquid outlet hole are formed in the frame body, and the plate frame in the cell stack is formed by alternately stacking the positive electrode and the negative electrode.

2. In order to alleviate the leakage current characteristics of the flow battery, the plate frame generally increases the resistance by increasing the length of the surface flow channel and reducing the hydraulic diameter. The method is to introduce the electrolyte into the electrode uniformly through a single or multiple winding flow channels. In order to increase the current density of the flow battery, which is usually operated under a large flow rate condition, the narrow and long flow channel causes excessive flow resistance.

3. The frame body thickness of the plate frame with the double-sided flow channel is larger than that of the plate frame with the single-sided flow channel. Therefore, the thinnest electrode material that can be selected is thicker than the plate frame of the single-sided flow channel, which causes the internal resistance of the single cell to be increased, and the voltage efficiency of the cell stack to be affected.

SUMMERY OF THE UTILITY MODEL

To the above problem, the utility model provides a flow cell plate frame, in order to alleviate flow cell's leakage current characteristic, general flow frame is through the length that increases the surface runner, reduces hydraulic diameter's mode and increases resistance. In order to increase the current density of the flow battery, which is usually operated under a large flow rate condition, the narrow and long flow channel causes excessive flow resistance. The purpose of this scheme is to control leakage current volume and to balance the flow resistance simultaneously, guarantees the total energy efficiency of system.

The plate frame flow channel also adopts a serpentine flow channel design. The main channel is divided equally into two meandering S-shaped branch flows. The two sub-flows then merge in the central buffer chamber with the aim of reducing the flow resistance and reducing the flow velocity. In order to prevent the electrolyte merged oppositely from flowing disorderly, a circular arc bulge is added for buffering. The electrolyte is further dispersed by the bosses and the concave tables which are distributed in a staggered manner in the Y-shaped liquid separating table, and finally flows into the long edge of the electrode cavity uniformly. The mode of coexistence of the concave table and the convex table is adopted to finish the uniform flow of the last step in a narrower space, and the plate frame space is ensured to be used as an electrode inner cavity as much as possible so as to improve the power of the galvanic pile.

The utility model provides a flow cell plate frame, includes positive plate frame and negative plate frame, and the plate frame of positive plate frame is the flat structure of rectangle, and the middle part fretwork is provided with on the plate frame for the electrode chamber: the outer layer sealing groove is arranged on the outermost layer of the plate frame; the positive electrolyte inlet, the positive electrolyte outlet, the negative electrolyte inlet and the negative electrolyte outlet are respectively arranged at 4 corners of the plate frame, and the positive electrolyte inlet and the positive electrolyte outlet, and the negative electrolyte inlet and the negative electrolyte outlet are distributed according to diagonal lines; the limiting grooves are arranged on the left side and the right side of the plate frame electrode cavity; the main runner, the main runner sealing groove, the central buffer cavity, the water diversion boss, the liquid flow hole sealing groove and the long straight line sealing groove are arranged on the upper portion and the lower portion of the electrode cavity in a mirror image manner, the first end of the main runner on the upper portion of the electrode cavity is communicated with the anode electrolyte inlet, the second end of the main runner is connected with the central buffer cavity, the central buffer cavity is arranged at the center line position of the plate frame, the main runner sealing groove is arranged around the main runner and the periphery of the electrode cavity, the water diversion boss is arranged in the middle of the central buffer cavity, the liquid flow hole sealing groove is arranged on the periphery of the cathode electrolyte inlet and the cathode electrolyte outlet, and the long straight line sealing groove is arranged in the middle of the straight line section of the water diversion boss; the surface structures of the negative plate frame and the positive plate frame are mirror images.

Further, the plate frame is further provided with baffle tables which are symmetrically distributed along the center line of the plate frame and are arranged on the upper portion and the lower portion of the electrode cavity in a mirror image mode, the baffle tables on the upper portion of the electrode cavity are arranged on the lower portion of the water diversion boss, and liquid separation tables are formed between adjacent baffle tables and between the baffle tables and the edge of the central buffer cavity.

Furthermore, a boss and a concave platform are arranged on the liquid separating platform.

Furthermore, the outer contour of the baffle table is Y-shaped, the upper end of the baffle table is linear, the two side surfaces of the baffle table are inclined planes and are connected with the lower end of the baffle table to be protruded, and the corners of the outer contour are in arc transition.

Furthermore, the middle of the baffle table is provided with a short straight line sealing groove.

Furthermore, the water diversion boss is of a T-shaped structure, the upper part of the water diversion boss is linear, and the lower part of the water diversion boss is a smooth bulge.

Furthermore, the convex platforms and the concave platforms are distributed on the liquid separating platform in a staggered mode.

The utility model has the advantages that: the inlet and the outlet of the electrolyte are distributed on the rectangular plate frame according to diagonal lines, the electrolyte in the main flow channel is divided into two S-shaped branches by the water dividing lug boss, the resistance in the galvanic pile is improved by the electrolyte in the S-shaped flow channel, and the leakage current is reduced; smooth bulges at the lower part of the water diversion boss prevent the turbulent flow when the branches converging face to face are mixed; further, the sheet frame still is provided with and keeps off the platform, keeps off between the platform adjacently, keeps off and forms the branch liquid platform with central buffer chamber border between the platform, divides the liquid bench to be provided with boss and concave station, and electrolyte is kept off the platform and is divided into a plurality of groups, is further mixed by crisscross boss and concave station, forms stable, the even electrolyte of velocity of flow, gets into the electrode chamber and participates in chemical reaction.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic diagram of a positive plate frame structure of a flow battery plate frame according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a local region of a central buffer cavity of a positive plate frame of a flow battery plate frame according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a local region of a positive plate frame liquid separation table of a flow battery plate frame according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a negative plate frame structure of a flow battery plate frame according to an embodiment of the present invention.

In the figure: the sealing structure comprises a plate frame 1, an outer layer sealing groove 2, a positive electrolyte inlet 31, a positive electrolyte outlet 32, a negative electrolyte inlet 33, a negative electrolyte outlet 34, a main flow channel 4, a main flow channel sealing groove 5, a limiting groove 6, a central buffer cavity 7, a water diversion boss 8, a baffle table 9, a liquid separation table 10, a liquid flow hole sealing groove 11, a long straight line sealing groove 12, a boss 13, a boss 14 and a short straight line sealing groove 15.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Please refer to fig. 1 and 4, fig. 1 is a schematic diagram of a positive plate frame structure of a flow battery plate frame according to an embodiment of the present invention, and fig. 4 is a schematic diagram of a negative plate frame structure of a flow battery plate frame according to an embodiment of the present invention, which includes a positive plate frame and a negative plate frame, and a surface structure of the negative plate frame and the positive plate frame are mirror images.

The following description will specifically take a positive electrode plate frame as an example. As shown in figure 1, the plate frame 1 is a rectangular flat plate structure, the middle part of the plate frame 1 is hollowed to form an electrode cavity, and the electrode material made of porous materials is embedded into the hollowed electrode cavity and is an electrochemical reaction site. The left side and the right side of the middle electrode cavity of the plate frame 1 are provided with limit grooves 6. When the plate frames 1 are stacked into a pile, bipolar plates or membrane materials need to be placed on the limiting grooves 6, and the depth and the size of the limiting grooves 6 are changed according to the overall dimensions and the thicknesses of the bipolar plates and the membrane materials. The surface flow channel of the positive plate frame is mirrored with the sealing structure to form the surface characteristic of the negative plate frame. The rectangular plate frame 1 is provided with a positive electrolyte inlet 31, a positive electrolyte outlet 32, a negative electrolyte inlet 33 and a negative electrolyte outlet 34 at 4 corners. The positive electrolyte inlet 31 and the positive electrolyte outlet 32, and the negative electrolyte inlet 33 and the negative electrolyte outlet 34 are distributed on the rectangular plate frame 1 according to diagonal lines.

Referring to fig. 2, fig. 2 is a local schematic diagram of a central buffer cavity area of a positive plate frame of a flow battery plate frame according to an embodiment of the present invention, in which an electrode cavity upper portion, a positive electrolyte flows into a main channel 4 through a positive electrolyte inlet 31, a second end of the main channel 4 is communicated with a central buffer cavity 7, and the central buffer cavity 7 is disposed at a central line position of the plate frame 1. The middle of the central buffer cavity 7 is provided with a water distribution boss 8, the water distribution boss 8 is of a T-shaped structure, the upper part of the water distribution boss is linear, and the lower part of the water distribution boss is smooth and convex.

The main flow passage 4 is divided into two meandering S-shaped branch flows by a straight line segment of the water dividing boss 8 in the middle of the plate frame 1, and then merged in the central buffer chamber 7. The width of the S-shaped branch flow channel is adjusted according to the actual situation, and the number of the bent channels is not limited to one. The S-shaped flow channel is adopted, so that the resistance caused by electrolyte in the flow channel in the stack is increased by increasing the length of the flow channel and reducing the hydraulic diameter, the leakage current phenomenon is reduced, and the coulomb efficiency of the stack body is improved.

Smooth bulge at the lower part of the water diversion boss 8 aims to prevent the two branches from colliding when converging to generate turbulent flow and cause uneven mixing of electrode liquid. The flow field of the electrolyte before entering the electrode cavity belongs to mixed redistribution. The purpose of this solution is to reduce the flow resistance. The long and narrow flow channel can increase the fluid resistance, and the existence of the central buffer cavity can greatly reduce the flow velocity, so that the electrolyte can enter the electrode cavity more smoothly, and the total flow resistance in the flow of the whole flow channel is reduced.

Please refer to fig. 3, fig. 3 is a local schematic diagram of an area of a positive plate frame liquid separating table of a flow battery plate frame according to an embodiment of the present invention, wherein the baffle table 9 symmetrically distributed along a central line of the plate frame 1 is disposed at a lower position of the water separating boss 8, an outer contour of the baffle table 9 is Y-shaped, an upper end of the baffle table is linear, two sides of the baffle table are inclined planes to connect with a lower end protrusion, corners of the outer contour are in arc transition, the symmetrically distributed baffle table 9 distributes the converged electrolyte uniformly into a plurality of parts again, and the number and the volume of the baffle table 9 are freely adjusted according to the size of the plate frame. Gaps between adjacent baffle tables 9 and gaps between the baffle tables 9 and the edge of the central buffer cavity 7 form Y-shaped liquid separating tables 10, the Y-shaped liquid separating tables 10 are flow equalizing areas, and each electrolyte flows into the Y-shaped flow equalizing areas to be redistributed in the last step. The Y-shaped liquid separating table 10 is provided with a boss 13 and a concave table 14, and the boss 13 and the concave table 14 are staggered and coexist. The design can evenly and transversely distribute the electrolyte to a wider area in a narrower area in the longitudinal direction of the plate frame. If only the lug boss is adopted, the width of each electrolyte which can transversely and uniformly flow through is insufficient. The number, shape and arrangement of the convex platforms 13 and the concave platforms 14 on the separating platform 10 are not limited to the embodiment shown in the embodiment.

In order to prevent the electrolyte from being distributed according to the characteristic flow channel on the surface of the plate frame, sealing grooves are arranged at different positions of the plate frame 1 and are matched with sealing gaskets to form sealing. The outermost layer of the plate frame 1 is provided with an outer layer sealing groove 2. An integral primary channel seal groove 5 is disposed around the primary channel 4 and the periphery of the electrode cavity of the plate frame 1. Only have positive pole or negative pole electrolyte in each sheet frame, liquid flow hole seal groove 11 sets up peripherally at negative pole electrolyte entry 33 and negative pole electrolyte export 34, prevents that positive negative pole electrolyte from mixing each other. The long straight line sealing groove 12 is arranged in the middle of the straight line section of the water distribution boss 8 and used for limiting the electrolyte in the S-shaped flow passage from turning over the ridge. The short straight line sealing groove 15 is arranged in the middle of the baffle table 9, has the same purpose as the long straight line sealing groove 12, and limits the electrolyte in the S-shaped flow passage from turning over the ridge.

The main runner 4, the sealing groove 5, the central buffer cavity 7, the water distribution boss 8, the baffle table 9, the liquid distribution table 10, the long straight line sealing groove 12, the boss 13, the concave table 14 and the short straight line sealing groove 15 are distributed on the upper part and the lower part of the electrode cavity in a mirror image mode.

The positive electrolyte flows out from the boss 13 and the concave table 14 on the upper part of the electrode cavity, enters the electrode cavity for reaction, flows through the boss 13, the concave table 14, the liquid separating table 10, the baffle table 9, the water dividing boss 8, the central buffer cavity 7 and the main runner 4 on the lower part of the electrode cavity in sequence, and finally flows out from the positive electrolyte outlet 32. The shapes and the mutual connection relations of the boss 13, the concave table 14, the liquid separating table 10, the baffle table 9, the water distributing boss 8, the central buffer chamber 7 and the main runner 4 at the lower part of the electrode cavity are mirror images of the upper part of the electrode cavity, and the description is omitted.

The surface structure of the negative plate frame and the positive plate frame are mirror images. The negative electrode electrolyte of the negative electrode plate frame flows in from a negative electrode electrolyte inlet 33, flows into the electrode cavity through a main runner 4, a central buffer cavity 7, a water distribution boss 8, a baffle table 9, a liquid separation table 10, a boss 13 and a concave table 14 on the upper portion of the electrode cavity, reacts, and finally flows out from a negative electrode electrolyte outlet 34 from the boss 13, the concave table 14, the liquid separation table 10, the baffle table 9, the water distribution boss 8, the central buffer cavity 7 and the main runner 4 on the lower portion of the electrode cavity.

Although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. The utility model provides a flow cell plate frame, its characterized in that, includes positive plate frame and negative plate frame, positive plate frame's plate frame (1) is the flat structure of rectangle, and the middle part fretwork is the electrode chamber, be provided with on plate frame (1):

the outer layer sealing groove (2) is arranged on the outermost layer of the plate frame (1);

a positive electrolyte inlet (31), a positive electrolyte outlet (32), a negative electrolyte inlet (33) and a negative electrolyte outlet (34) are respectively arranged at 4 corners of the plate frame (1), and the positive electrolyte inlet (31), the positive electrolyte outlet (32), the negative electrolyte inlet (33) and the negative electrolyte outlet (34) are distributed according to diagonal lines;

the limiting grooves (6) are arranged on the left side and the right side of the electrode cavity of the plate frame (1);

the main runner (4), the main runner sealing groove (5), the central buffer cavity (7), the water distribution boss (8), the liquid flow hole sealing groove (11) and the long straight line sealing groove (12) are arranged on the upper part and the lower part of the electrode cavity in a mirror image way, a first end of the main flow channel (4) at the upper part of the electrode cavity is communicated with the anode electrolyte inlet (31), a second end is connected with the central buffer cavity (7), the central buffer cavity (7) is arranged at the central line position of the plate frame (1), the primary runner seal groove (5) is arranged around the primary runner (4) and the periphery of the electrode cavity, the water diversion boss (8) is arranged in the middle of the central buffer cavity (7), the liquid flow hole sealing groove (11) is arranged at the periphery of the anode electrolyte inlet (33) and the anode electrolyte outlet (34), the long straight line sealing groove (12) is arranged in the middle of the straight line section of the water diversion boss (8);

the surface structures of the negative plate frame and the positive plate frame are mirror images.

2. The flow cell plate frame according to claim 1, wherein the plate frame (1) is further provided with baffle tables (9), the baffle tables (9) are symmetrically distributed along the center line of the plate frame (1) and are arranged at the upper part and the lower part of the electrode cavity in a mirror image manner, the baffle tables (9) at the upper part of the electrode cavity are arranged at the lower part of the water distribution boss (8), and a liquid distribution table (10) is formed between the adjacent baffle tables (9) and between the baffle tables (9) and the edge of the central buffer cavity (7).

3. Frame for liquid flow battery plates, according to claim 2, characterised in that said separating table (10) is provided with a boss (13) and a recess (14).

4. The flow battery plate frame according to claim 2 or 3, wherein the baffle table (9) is Y-shaped in outer contour, linear in upper end, inclined in two side surfaces, convex in lower end, and arc-shaped in corners of the outer contour.

5. The flow cell plate frame according to claim 4, characterized in that a short straight sealing groove (15) is arranged in the middle of the baffle table (9).

6. The flow cell plate frame according to claim 1, wherein the water diversion bosses (8) are T-shaped, the upper portions of the water diversion bosses are linear, and the lower portions of the water diversion bosses are smooth protrusions.

7. The flow cell plate frame as claimed in claim 3, wherein the lands (13) and the lands (14) are staggered on the liquid separation table (10).