Vanadium batteries with a unit structure including a semi-fluidized flow frame and a carbon felt through-type interdigitated flow channel

Abstract

A vanadium battery unit structure comprising a semi-flow frame and a carbon felt through-type interdigitated flow channel is disclosed, relating to the field of flow battery technology. This unit structure includes a flow frame and carbon felt flow channels. The flow frame comprises an upstream flow frame and a downstream flow frame. An upstream parallel DC channel of the upstream flow frame and a downstream parallel DC channel of the downstream flow frame are respectively connected to the carbon felt. The upstream flow frame is located on the lower right side of the carbon felt and consists of an upstream double-curved flow channel and an upstream parallel DC channel. The downstream flow frame is located on the upper left side of the carbon felt and consists of a downstream parallel DC channel and a downstream double-curved flow channel. The upstream and downstream interdigitated flow channels within the carbon felt are arranged in an interdigitated pattern. This invention provides a semi-flow frame vanadium battery structure with curved flow channels and parallel DC channels, as well as a carbon felt through-type interdigitated flow channel structure. The semi-flow frame reduces the flow path of the flow frame and increases the flow path within the carbon felt. The interdigitated flow channel transforms the flow within the carbon felt into lateral flow, resulting in better overall performance of the vanadium battery unit structure.

Description

Technical Field

[0001] This invention relates to the field of flow battery technology, specifically a flow battery cell structure having a semi-flow frame and a carbon felt through-type interdigitated flow channel. Background Technology

[0002] Vanadium redox flow batteries (vanadium batteries) have promising applications in new energy power generation and energy storage, as well as grid peak shaving and valley filling. When a vanadium battery is connected to a power source or load, a redox reaction occurs on the carbon felt electrode, changing the vanadium ion valence state and storing and releasing electrical energy through the current collector. The structure of the battery cell can affect the electrolyte flow field, thus influencing battery performance. Therefore, the design of the battery cell structure must consider the pressure drop and flow characteristics caused by the flow channel structure and fluid flow. Existing vanadium battery flow channel structures include serpentine channels, parallel channels, and interdigitated channels, mostly found in bipolar plates, and these existing flow channel structures still have shortcomings in terms of pressure drop and flow characteristics. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a unit structure for a vanadium battery containing a semi-fluid flow frame and a carbon felt through-type interdigitated flow channel. Through the scientific and rational design of the vanadium battery fluid flow frame and flow channel, the fluid flow characteristics of the vanadium battery are changed and the pressure drop loss is reduced.

[0004] To achieve the above-mentioned objectives, the unit structure of the present invention includes a liquid flow frame and a carbon felt flow channel. The liquid flow frame includes an upstream liquid flow frame and a downstream liquid flow frame. The upstream parallel DC channel of the upstream liquid flow frame and the downstream parallel DC channel of the downstream liquid flow frame are respectively connected to the carbon felt.

[0005] Furthermore, the upstream liquid flow frame is located on the lower right side of the carbon felt; an electrolyte inlet is provided on the surface of the upstream liquid flow frame, and the inlet is connected to the upstream double-bend flow channel; the upstream liquid flow frame consists of the upstream double-bend flow channel and the upstream parallel direct flow channel; the upstream double-bend flow channel includes an upstream first bend and an upstream second bend, the upstream and downstream of the upstream first bend are direct flow channels, the upstream of the upstream second bend is a direct flow channel, and the downstream of the upstream second bend is a direct flow channel with eight to twenty-six upstream grooved liquid distribution ports; the upstream double-bend flow channel is connected to the upstream parallel direct flow channel through the grooved liquid distribution ports; the upstream parallel direct flow channel contains eight to twenty-six parallel flow channels, and the upstream of the upstream parallel direct flow channel contains an upstream grooved liquid distribution port.

[0006] Furthermore, the downstream liquid flow frame is located on the upper left side of the carbon felt; an electrolyte outlet is provided on the surface of the downstream liquid flow frame, and the outlet is connected to the downstream double-bend flow channel; the downstream liquid flow frame consists of a downstream parallel direct flow channel and a downstream double-bend flow channel; the downstream parallel direct flow channel contains eight to twenty-six parallel flow channels, and the downstream of the downstream parallel direct flow channel contains a downstream groove distribution port; the downstream parallel direct flow channel is connected to the downstream double-bend flow channel through the downstream groove distribution port; the downstream double-bend flow channel includes a downstream first bend and a downstream second bend; the upstream of the downstream first bend is a direct flow channel containing eight to twenty-six downstream groove distribution ports, the downstream of the downstream first bend is a direct flow channel, and the upstream and downstream of the downstream second bend are direct flow channels.

[0007] Furthermore, the lower left, lower right, upper left, and upper right ends of the carbon felt are all rounded.

[0008] Furthermore, the rightmost side of the upstream parallel DC channel is connected to the leftmost side of the rounded corner at the lower right end of the carbon felt. The channels of the upstream parallel DC channel are arranged at equal intervals. At the middle position of the two rightmost channels of the upstream parallel DC channel, the rightmost channel of the upstream interdigitated channel is set. The channels of the upstream interdigitated channel are arranged at equal intervals.

[0009] Furthermore, the leftmost side of the downstream parallel DC channel is connected to the rightmost side of the rounded corner at the upper left end of the carbon felt. The channels of the downstream parallel DC channel are arranged at equal intervals. The leftmost channel of the downstream interdigitated channel is set at the middle position of the two leftmost channels of the downstream parallel DC channel. The channels of the downstream interdigitated channel are arranged at equal intervals. The upstream interdigitated channel and the downstream interdigitated channel are arranged in an interdigitated pattern.

[0010] Furthermore, the length of the carbon felt is twice the width of the carbon felt, the interdigitated flow channels within the carbon felt include an upstream interdigitated flow channel and a downstream interdigitated flow channel, the flow channels within the carbon felt penetrate the carbon felt, and the carbon felt includes a rounded corner at the lower right end, a rounded corner at the upper right end, a rounded corner at the upper left end, and a rounded corner at the lower left end.

[0011] Furthermore, the upstream interdigitated flow channel contains four to twelve flow channels. The lower end of the upstream interdigitated flow channel is connected to the lower edge of the carbon felt. The distance between the upper end of the upstream interdigitated flow channel and the upper edge of the carbon felt is less than 40% of the width of the carbon felt. The upper end of the upstream interdigitated flow channel has a raised rounded corner structure.

[0012] Furthermore, the downstream interdigitated flow channel contains four to twelve flow channels. The upper end of the downstream interdigitated flow channel is connected to the upper edge of the carbon felt, and the distance between the lower end of the downstream interdigitated flow channel and the lower edge of the carbon felt is less than 40% of the width of the carbon felt. The lower end of the downstream interdigitated flow channel has a concave rounded corner structure.

[0013] Compared with existing technologies, the vanadium battery of the present invention contains curved flow channels and parallel direct current channels, as well as a carbon felt through-type interdigitated flow channel structure. The semi-fluid flow frame can reduce the path of the fluid flow frame and increase the fluid flow path within the carbon felt. The interdigitated flow channel can change the flow within the carbon felt to lateral flow, resulting in better overall performance of the vanadium battery cell structure. Its beneficial effects are as follows: 1. Compared with the traditional full-flow frame, the liquid flow path in the semi-flow frame is reduced, which reduces the pressure loss in the semi-flow frame; the semi-flow frame consists of two parts: a curved flow channel and a parallel direct flow channel. The main function of the curved flow channel is to increase the flow path length and promote the uniform distribution of flow velocity in the flow frame; the connection between the parallel direct flow channel and the curved flow channel has a grooved liquid distribution port, which allows the electrolyte to converge and flow smoothly through the connection.

[0014] 2. The semi-liquid flow frame of the present invention is arranged on the lower right and upper left sides of the vanadium battery cell, which increases the flow path of the electrolyte in the carbon felt and is more conducive to the full electrochemical reaction of the electrolyte.

[0015] 3. This invention includes a carbon felt through-type interdigitated flow channel. The interdigitated flow channel transforms the electrolyte flow within the carbon felt into a lateral flow, increasing the flow path and allowing for a more complete electrochemical reaction. Compared to traditional bipolar plate etched interdigitated flow channels, the carbon felt through-type interdigitated flow channel reduces the contact area between the bipolar plate and the electrolyte, thereby reducing the degree of bipolar plate corrosion. Attached Figure Description

[0016] Figure 1 This is a simplified structural diagram of the present invention.

[0017] Figure 2 yes Figure 1 A simplified diagram of the upstream fluid flow frame structure.

[0018] Figure 3 yes Figure 1 A simplified diagram of the downstream fluid flow frame structure.

[0019] Figure 4 This is a schematic diagram of the longitudinal flow of electrolyte from upstream of the lower side of the carbon felt to downstream of the upper side of the carbon felt in a vanadium battery with a full flow frame and no interdigitated flow channels.

[0020] Figure 5 This is a schematic diagram of the inclined flow of electrolyte from the upper right side of the carbon felt to the lower left side of the carbon felt in a vanadium battery with a semi-fluid flow frame and no interdigitated flow channels.

[0021] Figure 6 This is a schematic diagram of the transverse flow of electrolyte from the lower right side of the carbon felt to the upper left side of the carbon felt.

[0022] In the diagram: 1. Upstream first bend; 2. Upstream double-bend flow channel; 3. Upstream second bend; 4. Inlet; 5. Upstream recessed distribution port; 6. Upstream parallel direct flow channel; 7. Rounded corner at the lower right end of the carbon felt; 8. Carbon felt; 9. Upstream interdigitated flow channel; 10. Downstream interdigitated flow channel; 11. Rounded corner at the upper right end of the carbon felt; 12. Downstream parallel direct flow channel; 13. Downstream recessed distribution port; 14. Downstream second bend; 15. Downstream double-bend flow channel; 16. Outlet; 17. Downstream first bend; 18. Rounded corner at the upper left end of the carbon felt; 19. Raised rounded corner structure; 20. Recessed rounded corner structure; 21. Rounded corner at the lower left end of the carbon felt; 22. Upstream flow frame; 23. Downstream flow frame. Detailed Implementation

[0023] like Figure 1 , Figure 2 , Figure 3 As shown, the unit structure of the vanadium battery of the present invention, which includes a liquid flow frame and a carbon felt through-type interdigitated flow channel, mainly includes a liquid flow frame and a carbon felt flow channel. The liquid flow frame mainly includes an upstream liquid flow frame 22 and a downstream liquid flow frame 23. The upstream parallel DC channel 6 of the upstream liquid flow frame 22 and the downstream parallel DC channel 12 of the downstream liquid flow frame 23 are respectively connected to the carbon felt 8. In contrast to the traditional full liquid flow frame, which refers to a liquid flow frame with channels distributed along the length of the carbon felt, the upstream liquid flow frame 22 and the downstream liquid flow frame 23 of the present invention are arranged on the lower right and upper left sides of the vanadium battery unit, respectively, forming a semi-liquid flow frame. The liquid flow path in the semi-liquid flow frame is reduced, which reduces the pressure loss in the semi-liquid flow frame. The electrolyte flow path in the carbon felt 8 is increased, which is more conducive to the full electrochemical reaction of the electrolyte. The semi-liquid flow frame includes two parts: a curved flow channel and a parallel DC channel. The main function of the curved flow channel is to increase the flow path length and promote the uniform distribution of flow velocity in the liquid flow frame.

[0024] The upstream liquid flow frame 22 is located on the lower right side of the carbon felt 8; an electrolyte inlet 4 is provided on the surface of the upstream liquid flow frame 22, and the inlet 4 is connected to the upstream double-bend flow channel 2; the upstream liquid flow frame 22 consists of the upstream double-bend flow channel 2 and the upstream parallel direct flow channel 6; the width of the upstream double-bend flow channel 2 is 5mm, and the upstream double-bend flow channel 2 includes an upstream first bend 1 and an upstream second bend 3. The upstream and downstream of the upstream first bend 1 are both direct flow channels, and the upstream of the upstream second bend 3 is a direct flow channel. Downstream of 3 is a direct current channel with seventeen upstream grooved liquid distribution ports 5. The upstream double-bend flow channel 2 is connected to the upstream parallel direct current channel 6 through the upstream grooved liquid distribution ports 5. The upstream parallel direct current channel 6 contains seventeen parallel channels. The upstream double-bend flow channel 2 is connected to the upstream parallel direct current channel 6 through the upstream grooved liquid distribution ports 5, which allows the electrolyte to converge and flow smoothly through the connection. The upstream grooved liquid distribution port 5 is 4 mm long and 2 mm wide. The upstream parallel direct current channel 6 is 24.6 mm long and 2 mm wide.

[0025] The downstream liquid flow frame 23 is located on the upper left side of the carbon felt 8; an electrolyte outlet 16 is provided on the surface of the downstream liquid flow frame 23, and the outlet 16 is connected to the downstream double-bend flow channel 15; the downstream liquid flow frame 23 is composed of a downstream parallel direct flow channel 12 and a downstream double-bend flow channel 15; the downstream parallel direct flow channel 12 contains seventeen parallel channels, and the downstream parallel direct flow channel 12 is connected to the downstream double-bend flow channel 15 through the downstream groove distribution port 13, which allows the electrolyte to converge and flow smoothly through the connection point, and the downstream parallel direct flow channel 12 is connected to the downstream double-bend flow channel 15 through the downstream groove distribution port 13. The grooved liquid distribution port 13 is connected to the downstream double-bend flow channel 15. The downstream double-bend flow channel 15 includes a downstream first bend 17 and a downstream second bend 14. Upstream of the downstream first bend 17 is a straight channel containing seventeen downstream grooved liquid distribution ports 13, and downstream of the downstream first bend 17 is a straight channel. Both upstream and downstream of the downstream second bend 14 are straight channels. The downstream parallel straight channel 12 has a length of 24.6 mm and a width of 2 mm, and the downstream double-bend flow channel 15 has a length of 145.6 mm and a width of 5 mm.

[0026] The rightmost side of the upstream parallel DC channel 6 is connected to the leftmost side of the rounded corner 7 at the lower right end of the carbon felt. The channels of the upstream parallel DC channel 6 are arranged at equal intervals. The rightmost channel of the upstream interdigitated channel 9 is set in the middle of the two rightmost channels of the upstream parallel DC channel 6. The channels of the upstream interdigitated channel 9 are arranged at equal intervals.

[0027] The leftmost side of the downstream parallel DC channel 12 is connected to the rightmost side of the upper left corner 18 of the carbon felt. The channels of the downstream parallel DC channel 12 are arranged at equal intervals. The leftmost channel of the downstream interdigitated channel 10 is set in the middle of the two leftmost channels of the downstream parallel DC channel 12. The channels of the downstream interdigitated channel 10 are arranged at equal intervals.

[0028] The length of carbon felt 8 is twice the width of carbon felt 8. The length of carbon felt 8 is 404 mm and the width is 202 mm. The interdigitated flow channel inside carbon felt 8 includes upstream interdigitated flow channel 9 and downstream interdigitated flow channel 10. The flow channel inside carbon felt 8 penetrates carbon felt 8. The lower left, lower right, upper left and upper right ends of carbon felt 8 are all rounded corner structures. Carbon felt 8 includes carbon felt lower right rounded corner 7, carbon felt upper right rounded corner 11, carbon felt upper left rounded corner 18 and carbon felt lower left rounded corner 21.

[0029] The upstream interdigitated channel 9 and the downstream interdigitated channel 10 are arranged in an interdigitated pattern. The interdigitated channel can make the electrolyte flow in the carbon felt 8 become a transverse flow, increasing the flow path and making the electrochemical reaction more complete. Compared with the traditional bipolar plate etched interdigitated channel, the carbon felt 8 through-type interdigitated channel can reduce the contact area between the bipolar plate and the electrolyte, thereby reducing the degree of bipolar plate corrosion. The upstream interdigitated flow channel 9 contains eight channels. The lower end of the upstream interdigitated flow channel 9 is connected to the lower edge of the carbon felt 8. The distance between the upper end of the upstream interdigitated flow channel 9 and the upper edge of the carbon felt 8 is 40.3 mm. The upper end of the upstream interdigitated flow channel 9 is a raised rounded corner structure 19. The length of the upstream interdigitated flow channel 9 is 192 mm and the width is 4 mm. The downstream interdigitated flow channel 10 contains eight channels. The upper end of the downstream interdigitated flow channel 10 is connected to the upper edge of the carbon felt 8. The distance between the lower end of the downstream interdigitated flow channel 10 and the lower edge of the carbon felt 8 is 40.3 mm. The lower end of the downstream interdigitated flow channel 10 is a recessed rounded corner structure 20. The length of the downstream interdigitated flow channel 10 is 192 mm and the width is 4 mm.

[0030] The upstream flow frame 22 and the downstream flow frame 23 have the following structural similarities: the upstream double-bend flow channel 2 and the downstream double-bend flow channel 15 are similar; the upstream parallel direct flow channel 6 and the downstream parallel direct flow channel 12 are similar; the upstream interdigitated flow channel 9 and the downstream interdigitated flow channel 10 are similar; the upstream grooved liquid distribution port 5 and the downstream grooved liquid distribution port 13 are similar.

[0031] The working process of a vanadium battery is explained in detail below: The electrolyte flows into the upstream double-bend channel 2 from the inlet 4, and then flows through the upstream first bend 1 and the upstream second bend 3 in sequence. In the upstream double-bend channel 2, after being buffered and slowed down, the electrolyte flows into the upstream groove distribution port 5 and then into the upstream parallel direct current channel 6. Next, the electrolyte flows into the carbon felt 8, the upstream interdigitated channel 9, and the downstream interdigitated channel 10. In the carbon felt 8, because the resistance of the carbon felt 8 is different from that of the interdigitated channel, the electrolyte permeates into the carbon felt 8 along the upstream interdigitated channel 9 and the downstream interdigitated channel 10, forming a lateral flow phenomenon, which is more conducive to the electrochemical reaction. Finally, the electrolyte flows into the downstream parallel direct current channel 12, and then flows through the downstream groove distribution port 13, the downstream first bend 17 and the downstream second bend 14 of the downstream double-bend channel 15 in sequence, and finally flows out through the outlet 16.

[0032] The following compares the present invention with common vanadium batteries using a full flow frame without interdigitated channels and a semi-flow frame without interdigitated channels, when the effective area of ​​the carbon felt is 711 cm². 2 At that time, the electrolyte flow test results were compared under two commonly used flow rate conditions of 0.168 m / s and 0.335 m / s.

[0033] Using the structure of a vanadium battery with a full flow frame and no interdigitated channels as a reference, the electrolyte inlet and outlet pressure drops of a vanadium battery with a half flow frame and no interdigitated channels increased by 7.60% and 6.81%, respectively, while the electrolyte inlet and outlet pressure drops of the present invention decreased by 23.53% and 19.90%, respectively.

[0034] The electrolyte flow characteristics are compared as follows: like Figure 4 The diagram shows the longitudinal flow of electrolyte from upstream of the lower side of the carbon felt to downstream of the upper side of the carbon felt in a vanadium battery with a full-flow-box design and no interdigitated channels. Figure 5 The diagram shows the inclined flow of electrolyte from upstream of the lower right side of the carbon felt to downstream of the upper left side of the carbon felt in a vanadium battery with a semi-fluid flow frame and no interdigitated channels. Figure 6 The diagram shows the lateral flow of electrolyte from the lower right side of the carbon felt 8 upstream to the upper left side of the carbon felt 8 downstream.

[0035] The comparison shows that the battery cell of the present invention has a smaller voltage drop, and the electrolyte flow characteristic within the carbon felt 8 is lateral flow. The present invention achieves the effect of reducing energy loss by reducing pressure drop, and enhances mass transfer capacity by changing the flow characteristics.

Claims

1. A unit structure for a vanadium battery comprising a semi-fluidized flow frame and a carbon felt through-type interdigitated flow channel, characterized in that: The unit structure includes a liquid flow frame and a carbon felt flow channel. The liquid flow frame includes an upstream liquid flow frame (22) and a downstream liquid flow frame (23). The upstream parallel DC channel (6) of the upstream liquid flow frame (22) and the downstream parallel DC channel (12) of the downstream liquid flow frame (23) are respectively connected to the carbon felt (8). The upstream liquid flow frame (22) is located on the lower right side of the carbon felt (8); an electrolyte inlet (4) is provided on the surface of the upstream liquid flow frame (22), and the inlet (4) is connected to the upstream double-bend flow channel (2); the upstream liquid flow frame (22) is composed of the upstream double-bend flow channel (2) and the upstream parallel direct flow channel (6); the upstream double-bend flow channel (2) includes the upstream first bend (1) and the upstream second bend (3), the upstream and downstream of the upstream first bend (1) are direct flow channels, the upstream of the upstream second bend (3) is a direct flow channel, and the downstream of the upstream second bend (3) is a direct flow channel with eight to twenty-six upstream grooved liquid distribution ports (5). The upstream double-bend flow channel (2) is connected to the upstream parallel direct flow channel (6) through the upstream grooved liquid distribution ports (5). The upstream parallel direct flow channel (6) contains eight to twenty-six parallel flow channels, and the upstream of the upstream parallel direct flow channel (6) contains the upstream grooved liquid distribution ports (5). The downstream liquid flow frame (23) is located on the upper left side of the carbon felt (8); an electrolyte outlet (16) is provided on the surface of the downstream liquid flow frame (23), and the outlet (16) is connected to the downstream double-bend flow channel (15); the downstream liquid flow frame (23) is composed of a downstream parallel direct current channel (12) and a downstream double-bend flow channel (15); the downstream parallel direct current channel (12) contains eight to twenty-six parallel channels, and the downstream of the downstream parallel direct current channel (12) contains a downstream groove distribution port (13). The downstream parallel direct current channel (12) is connected to the downstream double-bend flow channel (15) through the downstream groove distribution port (13). The downstream double-bend flow channel (15) includes a downstream first bend (17) and a downstream second bend (14). The upstream of the downstream first bend (17) is a direct current channel containing eight to twenty-six downstream groove distribution ports (13), the downstream of the downstream first bend (17) is a direct current channel, and the upstream and downstream of the downstream second bend (14) are direct current channels; The lower left, lower right, upper left and upper right ends of the carbon felt (8) are all rounded. The length of the carbon felt (8) is twice the width of the carbon felt (8). The interdigitated flow channels inside the carbon felt (8) include an upstream interdigitated flow channel (9) and a downstream interdigitated flow channel (10). The flow channels inside the carbon felt (8) penetrate the carbon felt (8). The carbon felt (8) includes a lower right corner rounded corner (7), an upper right corner rounded corner (11), an upper left corner rounded corner (18), and a lower left corner rounded corner (21). The upstream interdigitated flow channel (9) and the downstream interdigitated flow channel (10) are arranged in an interdigitated pattern; The working process of the vanadium battery: The electrolyte flows into the upstream double-bend channel (2) from the inlet (4), and flows through the upstream first bend (1) and the upstream second bend (3) in sequence. In the upstream double-bend channel (2), after buffering and deceleration, the electrolyte flows into the upstream groove distribution port (5) and then into the upstream parallel direct current channel (6). Next, the electrolyte flows into the carbon felt (8), the upstream interdigitated channel (9) and the downstream interdigitated channel (10). In the carbon felt (8), the electrolyte permeates into the carbon felt (8) along the upstream interdigitated channel (9) and the downstream interdigitated channel (10), forming a transverse flow phenomenon. Finally, the electrolyte flows into the downstream parallel direct current channel (12). The electrolyte flows through the downstream groove distribution port (13), the downstream first bend (17) and the downstream second bend (14) of the downstream double-bend channel (15) in sequence, and finally flows out through the outlet (16).

2. The unit structure of the vanadium battery with a semi-fluidized flow frame and a carbon felt through-type interdigitated flow channel according to claim 1, characterized in that: The rightmost side of the upstream parallel DC channel (6) is connected to the leftmost side of the lower right corner rounded corner (7) of the carbon felt. The channels of the upstream parallel DC channel (6) are arranged at equal intervals. The rightmost channel of the upstream interdigitated channel (9) is set in the middle of the two rightmost channels of the upstream parallel DC channel (6). The channels of the upstream interdigitated channel (9) are arranged at equal intervals.

3. The unit structure of the vanadium battery according to claim 1, comprising a semi-fluidized flow frame and a carbon felt through-type interdigitated flow channel, is characterized in that: The leftmost side of the downstream parallel DC channel (12) is connected to the rightmost side of the upper left corner (18) of the carbon felt. The channels of the downstream parallel DC channel (12) are arranged at equal intervals. The leftmost channel of the downstream interdigitated channel (10) is set in the middle of the two leftmost channels of the downstream parallel DC channel (12). The channels of the downstream interdigitated channel (10) are arranged at equal intervals.

4. The unit structure of the vanadium battery with a semi-fluidized flow frame and a carbon felt through-type interdigitated flow channel according to claim 1, characterized in that: The upstream interdigitated flow channel (9) contains four to twelve flow channels. The lower end of the upstream interdigitated flow channel (9) is connected to the lower edge of the carbon felt (8). The distance between the upper end of the upstream interdigitated flow channel (9) and the upper edge of the carbon felt (8) is less than 40% of the width of the carbon felt (8). The upper end of the upstream interdigitated flow channel (9) is a raised rounded corner structure (19).

5. The unit structure of the vanadium battery with a semi-fluidized flow frame and a carbon felt through-type interdigitated flow channel according to claim 1, characterized in that: The downstream interdigitated flow channel (10) contains four to twelve flow channels. The upper end of the downstream interdigitated flow channel (10) is connected to the upper edge of the carbon felt (8). The distance between the lower end of the downstream interdigitated flow channel (10) and the lower edge of the carbon felt (8) is less than 40% of the width of the carbon felt (8). The lower end of the downstream interdigitated flow channel (10) is a recessed rounded corner structure (20).

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