CN214848707U

CN214848707U - Liquid flow frame with concave-convex structure for flow battery

Info

Publication number: CN214848707U
Application number: CN202121415817.7U
Authority: CN
Inventors: 曾义凯
Original assignee: Southwest Jiaotong University
Current assignee: Sichuan Tianfu Energy Storage Technology Co ltd
Priority date: 2021-06-24
Filing date: 2021-06-24
Publication date: 2021-11-23
Anticipated expiration: 2031-06-24

Abstract

The utility model discloses a concave-convex structure's liquid flow frame for redox flow battery, include two liquid flow frame mechanisms and be located the bipolar plate between two liquid flow frame mechanisms, liquid flow frame mechanism includes liquid flow frame body, constructs side by side concave station and boss in liquid flow frame body upper and lower both sides respectively, the internal construction of boss has the snakelike current-limiting channel that reduces the bypass current loss, one the boss of liquid flow frame body and the position of the concave station of another liquid flow frame body correspond, bipolar plate's both sides all are provided with the carbon felt, and the carbon felt nestification is installed in the inboard of liquid flow frame body, the surface texture of carbon felt has distribution channel, distribution channel and snakelike current-limiting channel intercommunication. According to the liquid flow frame with the concave-convex structure for the flow battery, the flow resistance and the pumping power loss of the current limiting channel are remarkably reduced under the condition that the average thickness of the liquid flow frame body and the thickness of the carbon felt electrode are both thin.

Description

Liquid flow frame with concave-convex structure for flow battery

Technical Field

The utility model belongs to the technical field of the redox flow battery, especially, redox flow battery is with concave-convex structure's flow frame.

Background

Flow batteries are a secondary battery technology in which an active material is present in a liquid electrolyte. The electrolyte is arranged outside the galvanic pile, flows through the galvanic pile under the driving of the circulating pump, and generates electrochemical reaction to realize the conversion of chemical energy and electric energy, thereby realizing the storage and the release of the electric energy. At present, the conventional flow battery structure takes an all-vanadium flow battery as an example, a perfusion type battery structure is adopted, and the carbon felt is thick, the internal resistance of the battery is high, and the performance is poor.

In order to improve the performance of the battery, the thickness of the carbon felt needs to be reduced, and meanwhile, as the thickness of the flow frame is generally equal to that of the electrode, the thickness of the flow frame also needs to be reduced, which leads to the reduction of the depth of the flow channel on the flow frame, the resistance and pressure drop of electrolyte flowing on the flow frame are obviously increased, and the pumping power loss is increased.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a flow battery is with concave-convex structure's liquid stream frame to solve the problem that provides among the prior art.

The technical scheme is as follows: a flow frame with a concave-convex structure for a flow battery comprises two flow frame mechanisms and a bipolar plate positioned between the two flow frame mechanisms,

the liquid flow frame mechanism comprises a liquid flow frame body, side-by-side concave tables and convex tables which are respectively constructed on the upper side and the lower side of the liquid flow frame body, a snakelike current limiting channel for reducing bypass current loss is constructed in the convex tables, one convex table of the liquid flow frame body corresponds to the concave table of the other liquid flow frame body in position, carbon felts are arranged on two sides of the bipolar plate and are nested and installed on the inner side of the liquid flow frame body, a distribution channel is constructed on the surface of each carbon felt, and the distribution channel is communicated with the snakelike current limiting channel.

In a further embodiment, the bipolar plate and the two flow frame bodies are sealed by a compression gasket or welding.

In a further embodiment, a diaphragm is arranged on the side of the flow frame mechanism away from the bipolar plate, and the diaphragm and the flow frame mechanism are sealed through a compression sealing gasket or welding.

In a further embodiment, four corners of the flow frame body are provided with liquid inlet and outlet holes for passing in and out the electrolyte.

In a further embodiment, the boss of one of the flow frame bodies and the corresponding boss of the other flow frame body are sealed by a compression gasket or a welding process.

The utility model discloses a technological effect and advantage: according to the liquid flow frame with the concave-convex structure for the liquid flow battery, the snake-shaped flow limiting channel is arranged in the boss, so that the depth of the flow limiting snake-shaped channel can be obviously increased, the flow resistance and the pump work caused by the snake-shaped flow limiting channel can be obviously reduced, and the comprehensive energy conversion efficiency of the battery can be improved; according to the liquid flow frame with the concave-convex structure for the flow battery, the flow resistance and the pumping power loss of the current limiting channel are remarkably reduced under the condition that the average thickness of the liquid flow frame body and the thickness of the carbon felt electrode are both thin.

Drawings

FIG. 1 is an exploded view of the structure of the present invention;

FIG. 2 is a schematic structural view of the liquid flow frame mechanism of the present invention;

FIG. 3 is a front view of the fluid frame mechanism of the present invention;

FIG. 4 is a front view of the present conventional flow frame;

FIG. 5 is an exploded view of another embodiment of the present invention;

fig. 6 is a schematic structural view of another combined liquid flow frame mechanism of the present invention.

In the figure: the device comprises a liquid flow frame mechanism 1, a liquid flow frame body 11, a concave table 12, a convex table 13, a snake-shaped flow limiting channel 14, a liquid inlet and outlet hole 15, a carbon felt 2, a bipolar plate 3 and a diaphragm 4.

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the present invention.

In order to remarkably reduce the flow resistance and the pumping work loss of the flow limiting channel under the condition that the average thickness of the liquid flow frame body 11 is thinner, referring to fig. 1, 2 and 5, a bipolar plate 3 is disposed between two flow frame mechanisms 1, each flow frame mechanism 1 includes a flow frame body 11, side-by-side concave stages 12 and convex stages 13 respectively formed on upper and lower sides of the flow frame body 11, a serpentine current-limiting channel 14 for reducing a loss of a bypass current is formed inside the convex stage 13, the convex stage 13 of one flow frame body 11 corresponds to the concave stage 12 of the other flow frame body 11, carbon felts 2 are disposed on both sides of the bipolar plate 3, the carbon felt 2 is nested and installed on the inner side of the liquid flow frame body 11, a distribution channel is constructed on the surface of the carbon felt 2 and is communicated with the snake-shaped flow limiting channel 14, a diaphragm 4 is arranged on one side of the liquid flow frame mechanism 1 far away from the bipolar plate 3, and the diaphragm 4 and the liquid flow frame mechanism 1 are sealed through a compression sealing gasket or welding;

the traditional liquid flow frame mechanism 1 is structured as shown in figure 4, the plane thickness of the whole liquid flow frame body 11 is 2.5mm, the maximum depth of the current limiting channel is only 2mm, the flow resistance and the pump work of the electrolyte are relatively high, the liquid flow frame mechanism 2 of the utility model is structured as shown in figure 3, the thickness of the liquid flow frame body 11 is 2.5mm, the plane thickness of the concave table 12 is 0.5mm, the plane thickness of the convex table 13 is 4.5mm, the depth of the snake-shaped current limiting channel 14 structured in the convex table 13 is obviously increased, the flow cross section area of the electrolyte is also obviously increased, the plane thickness of the concave table 12 is 0.5mm, the snake-shaped current limiting channel 14 with the depth reaching 4mm can be arranged at the deepest of the convex table 13, the flow resistance and the pump work of the electrolyte can be obviously reduced, the comprehensive energy conversion efficiency of the battery is increased, the resistance formula R is rho L/S, and it can be known that after the flow cross section area of the current limiting channel is increased, the length of the current limiting channel only needs to be correspondingly increased, the resistance of the flow limiting channel is kept unchanged, and under the same flow, the pressure drop caused by the flow limiting channel is in inverse proportion to the square of the sectional area of the flow channel and in direct proportion to the length of the flow channel. Therefore, as the cross section area and the length of the flow limiting channel are increased in proportion, the pressure drop of the flow limiting channel is obviously reduced according to a pressure drop calculation formula, which is favorable for reducing the pumping power loss and improving the comprehensive energy conversion efficiency of the battery;

the serpentine flow-limiting channel 14 on the flow frame body 11 and the distribution channel on the carbon felt 2 can face the bipolar plate 3 as shown in fig. 1 or the membrane 4 as shown in fig. 5, and the structure of the flow frame mechanism 1 is as shown in fig. 6, and the corresponding boss 13 and the corresponding recess 12 are changed due to the change of the orientation of the serpentine flow-limiting channel 14, so that the flow resistance and the pump power loss of the flow-limiting channel can be remarkably reduced;

in order to ensure the sealing performance of the device, as shown in fig. 1 and 2, the bipolar plate 3 and the two flow frame bodies 11 are sealed by compression sealing gaskets or welding, liquid inlet and outlet holes 15 for inlet and outlet of electrolyte are formed at four corners of each flow frame body 11, and a boss 13 of one flow frame body 11 and a corresponding boss 12 of the other flow frame body 11 are sealed by compression sealing gaskets or welding.

Finally, it should be noted that: the foregoing is merely a preferred embodiment of the present invention and is not intended to limit the scope of the invention.

Claims

1. A flow frame of a concave-convex structure for a flow battery comprises two flow frame mechanisms (1) and a bipolar plate (3) positioned between the two flow frame mechanisms (1), and is characterized in that:

the liquid flow frame mechanism (1) comprises a liquid flow frame body (11), and a side-by-side concave table (12) and a convex table (13) which are respectively constructed on the upper side and the lower side of the liquid flow frame body (11), wherein a snake-shaped current limiting channel (14) for reducing the bypass current loss is constructed in the convex table (13), one of the convex table (13) of the liquid flow frame body (11) corresponds to the concave table (12) of the other liquid flow frame body (11), carbon felts (2) are arranged on the two sides of the bipolar plate (3), the carbon felts (2) are nested and installed on the inner side of the liquid flow frame body (11), a distribution channel is constructed on the surface of the carbon felts (2), and the distribution channel is communicated with the snake-shaped current limiting channel (14).

2. The flow frame with a concave-convex structure for a flow battery according to claim 1, characterized in that: the bipolar plate (3) and the two liquid flow frame bodies (11) are sealed through compression sealing gaskets or welding.

3. The flow frame with a concave-convex structure for a flow battery according to claim 1, characterized in that: and a diaphragm (4) is arranged on one side of the liquid flow frame mechanism (1) far away from the bipolar plate (3), and the diaphragm (4) and the liquid flow frame mechanism (1) are sealed through a compression sealing gasket or welding.

4. The flow frame with a concave-convex structure for a flow battery according to claim 1, characterized in that: and liquid inlet and outlet holes (15) for passing in and out the electrolyte are formed in four corners of the liquid flow frame body (11).

5. The flow frame with a concave-convex structure for a flow battery according to claim 1, characterized in that: the boss (13) of one liquid flow frame body (11) and the corresponding boss (12) of the other liquid flow frame body (11) are sealed through a compression sealing gasket or a welding process.