A liquid flow battery liquid path intermittent flow structure and a liquid flow battery stack

Abstract

The present invention relates to the technical field of liquid flow batteries, and specifically discloses a liquid flow battery liquid path intermittent flow structure and a liquid flow battery stack, including a vertical pipe flow channel, a disperser, an electrolyte reservoir, an intermittent flow liquid, and an electrolyte; the liquid flow battery electrolyte continuously enters from the upper end of the intermittent flow liquid, and forms discontinuous droplets after encountering the disperser during the flow of the intermittent flow liquid, and finally flows into the electrolyte reservoir after polymerizing at the end of the vertical pipe flow channel, and the electrolyte then flows continuously from the electrolyte reservoir into the stack to ensure the continuity of the charge and discharge of the stack. The intermittent flow liquid of the present invention is not miscible with the electrolyte, and the density of the intermittent flow liquid is lower than that of the electrolyte. Since the intermittent flow liquid is an insulating liquid, the electrolyte entering and exiting the vertical pipe flow channel is electrically non-conductive at both ends of the vertical pipe flow channel, so that leakage caused by the conductive electrolyte closed loop does not occur when the liquid flow battery is working, and the intermittent flow liquid does not flow into the stack with the electrolyte. The present invention completely solves the problem of stack leakage.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid flow batteries, and in particular to a liquid flow battery liquid path intermittent flow structure and a liquid flow battery stack. Background Art

[0002] Liquid flow batteries have the characteristics of good safety and long service life, and are ideal batteries for long-term energy storage applications. Liquid flow batteries charge and discharge electrolytes when the electrolyte liquid circulates in the battery stack to achieve the conversion of electrical energy and chemical energy. The liquid flow battery system mainly includes the battery stack, circulation pump, circulation pipeline, liquid storage device, electrolyte, energy storage converter (PCS), etc. Usually, the positive and negative electrolytes are stored in the positive and negative electrode storage devices. When the battery is working, the electrolyte needs to flow between the storage device and the battery stack to achieve a continuous charging and discharging process. During the operation of the battery, the circulation pump is required to provide liquid flow power. When the liquid flow battery is working, the positive electrolyte or the negative electrolyte is connected together, and the electrolyte has good conductivity; at the same time, the battery stack is a battery group composed of single batteries connected in series by multiple circuits. The voltage in the battery stack gradually increases from the negative electrode, so that the conductive electrolyte forms a dispersed battery discharge load, causing the battery stack to leak. This leakage will occur during the charging and discharging process, and its leakage current depends on the voltage of the battery stack and the conductivity of the electrolyte. Leakage in the battery stack not only wastes electrical energy, causing low charging and discharging efficiency of the battery stack, but also causes the temperature of the battery stack to rise, increasing the energy consumption of the thermal management system, and also reducing the efficiency of the flow battery system.

[0003] In order to reduce the leakage problem inherent in liquid flow batteries, a current limiting channel is usually set in the battery stack to increase the length of the electrolyte channel in and out of the battery stack, increase the leakage resistance of the electrolyte, and reduce the leakage current; the disadvantage of this design is that on the one hand it increases the volume of the battery stack, and on the other hand it increases the flow resistance of the electrolyte, which increases the pumping consumption of the entire liquid flow battery system, thereby reducing the energy efficiency of the liquid flow battery system.

[0004] Therefore, how to minimize the leakage current of the battery stack and reduce the energy consumption of the circulation pump while ensuring the normal operation of the battery is a technical problem that needs to be solved urgently in this field. Summary of the invention

[0005] In order to solve the problems existing in the prior art, the present invention provides a liquid flow battery liquid path intermittent flow structure and a liquid flow battery stack, including a vertical pipe flow channel, a disperser, an electrolyte reservoir, intermittent flow liquid, and an electrolyte; the liquid flow battery electrolyte continuously enters from the upper end of the intermittent flow liquid, forms discontinuous droplets after encountering the disperser during the flow of the intermittent flow liquid, and finally aggregates at the end of the vertical pipe flow channel and flows into the electrolyte reservoir, and the electrolyte then flows continuously from the electrolyte reservoir into the stack, thereby ensuring the continuity of charging and discharging of the stack, and the intermittent flow liquid does not flow into the stack with the electrolyte, thereby solving the stack leakage problem mentioned in the above background technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solutions: a liquid flow battery liquid circuit intermittent flow structure, the intermittent flow structure comprises an intermittent flow shell; the intermittent flow shell comprises an intermittent flow shell lower part and an intermittent flow shell upper part; and a vertical pipe flow channel, an electrolyte reservoir, an intermittent flow liquid, an electrolyte and a disperser arranged between the intermittent flow shell lower part and the intermittent flow shell upper part;

[0007] The disperser is arranged at the upper part of the vertical pipe flow channel, the electrolyte reservoir is located at the lower part of the vertical pipe flow channel, and the interior of the vertical pipe flow channel is filled with intermittent flow liquid; the electrolyte reservoir is used to contain electrolyte, the intermittent flow liquid is not miscible with the electrolyte, does not chemically react, and the density of the intermittent flow liquid is lower than that of the electrolyte.

[0008] Preferably, the structure of the disperser is a sieve-like structure or an umbrella-like structure.

[0009] Preferably, the intermittent flow liquid is white mineral oil and / or an insulating liquid made from white mineral oil.

[0010] Preferably, the inner cross-sectional area of ​​the vertical pipe flow channel is larger than the inner cross-sectional area of ​​the pipeline entering and exiting the vertical pipe flow channel.

[0011] Preferably, the intermittent flow structure is fixedly connected to the pole core assembly plate frame by bonding, welding or slotting. After the connection, a passage is formed between the intermittent flow structure and the electrolyte inlet main channel and the electrolyte outlet main channel on the pole core assembly plate frame, so that the electrolyte passing through the intermittent flow structure flows into the battery stack to realize an electrochemical reaction in the reaction zone.

[0012] Preferably, the intermittent flow structure is divided into a liquid inlet intermittent flow structure and a liquid outlet intermittent flow structure according to the installation position of the intermittent flow structure during the installation of the battery stack;

[0013] In the intermittent flow structure for liquid inlet, the intermittent flow structure for liquid inlet is installed at the liquid inlet of the battery stack, the electrolyte outlet is connected to the electrolyte inlet main channel on the pole core assembly plate frame, and the electrolyte in the positive electrolyte storage tank or the negative electrolyte storage tank in the liquid flow battery flows into the intermittent flow liquid from the upper part of the vertical pipe flow channel through the electrolyte shared channel, and changes the flow direction after encountering the disperser and is dispersed into discontinuous droplets, and electrical insulation is formed during the dispersion process to prevent leakage of the liquid flow battery; after the droplets descend, they aggregate at the end of the vertical pipe flow channel and then flow into the electrolyte reservoir, and the electrolyte then flows continuously from the electrolyte reservoir into the battery stack through the electrolyte outlet, and the intermittent flow liquid does not flow with the electrolyte;

[0014] In the liquid outlet intermittent flow structure, the liquid outlet intermittent flow structure is installed at the liquid outlet of the battery stack, the electrolyte outlet is connected to the electrolyte outlet main channel on the pole core group plate frame, the electrolyte in the positive electrolyte storage tank or the negative electrolyte storage tank in the liquid flow battery flows into the intermittent flow liquid from the upper part of the vertical pipe flow channel through the electrolyte outlet, changes the flow direction after encountering the disperser and is dispersed into discontinuous droplets, and forms electrical insulation during the dispersion process to prevent leakage of the liquid flow battery; after the droplets descend, they aggregate at the end of the vertical pipe flow channel and then flow into the electrolyte reservoir, and the electrolyte then continuously flows out of the battery stack from the electrolyte reservoir through the electrolyte shared channel, and the intermittent flow liquid does not flow with the electrolyte.

[0015] On the other hand, to achieve the above-mentioned purpose, the present invention also provides the following technical solution: a liquid flow battery stack, wherein the liquid flow battery comprises the liquid flow battery liquid path intermittent flow structure.

[0016] Preferably, the positive electrode or negative electrode of each single-electrode group in each battery stack is provided with an intermittent flow structure;

[0017] Or one or more connected / staggered positive / negative electrode groups share an intermittent flow structure;

[0018] Or multiple intermittent flow structures are combined together to form an intermittent flow structure group, and the intermittent flow structure group is connected to the positive electrode group or the negative electrode group in the battery stack to achieve intermittent flow connection of each electrode group.

[0019] Preferably, the intermittent flow structure is arranged at a position after the electrolyte shared channel and before the flow battery stack;

[0020] Or arranged in front of the electrolyte shared channel and behind the battery stack;

[0021] Or the intermittent flow structure is arranged at a pipeline far away from the electrolyte shared channel to realize the intermittent flow connection of the total positive or negative electrolyte entering or leaving the battery stack to eliminate the leakage current between the battery stacks.

[0022] Preferably, the intermittent flow structure is arranged at both the positive electrode inlet and outlet positions and the negative electrode inlet and outlet positions in the electrolyte shared channel, and no intermittent flow structure is arranged between the battery stacks.

[0023] The beneficial effect of the present invention is that when the electrolyte flows through the intermittent flow structure of the present invention, it will be disconnected by the intermittent flow liquid. Since the intermittent flow liquid is an insulating liquid, the electrolyte at both ends of the intermittent flow liquid will be electrically non-conductive, thereby avoiding the leakage problem caused by the closed loop of the conductive electrolyte when the battery is working. At the same time, there is no need to design a long electrolyte current limiting channel flowing into and out of the reaction area when designing the battery stack. This can reduce the pressure requirement for the electrolyte flow and reduce pump consumption, thereby improving the battery's charging and discharging energy efficiency from two aspects. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the installation of a battery stack according to an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the intermittent flow structure of an embodiment of the present invention;

[0026] Figure 3a A schematic diagram of the internal structure of the disperser of the embodiment of the present invention is a sieve-shaped discontinuous flow inlet;

[0027] Figure 3b A schematic diagram of the internal structure of the disperser of the embodiment of the present invention is an umbrella-shaped discontinuous flow inlet;

[0028] Figure 4a A schematic diagram of the internal structure of the disperser of the embodiment of the present invention is a sieve-shaped discontinuous flow of liquid;

[0029] Figure 4b A schematic diagram of the internal structure of the disperser of the embodiment of the present invention is an umbrella-shaped discontinuous flow of liquid;

[0030] Figure 5 This is a schematic diagram of the arrangement of the intermittent flow structure between the battery stacks according to an embodiment of the present invention;

[0031] In the figure, 1-under the intermittent flow shell; 110-vertical pipe flow channel; 120-electrolyte reservoir; 2-intermittent flow liquid; 3-electrolyte; 4-disperser; 5-on the intermittent flow shell; 51-electrolyte shared channel; 52-electrolyte outlet; 6-core assembly plate frame; 61-electrolyte inlet main channel; 62-electrolyte outlet main channel; 7-reaction zone; 8-intermittent flow structure; 9-positive electrode electrolyte storage tank; 10-negative electrode electrolyte storage tank; 11-cell stack; 12-pump. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] It should be noted that the embodiments and features of the embodiments of the present invention can be combined with each other without conflict. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0034] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use, or the positions or positional relationships commonly understood by those skilled in the art, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0035] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] See also Figure 1 An embodiment of the present invention provides a technical solution: a liquid flow battery liquid path intermittent flow structure, the intermittent flow structure 8 includes an intermittent flow shell; the intermittent flow shell includes an intermittent flow shell lower 1 and an intermittent flow shell upper 5; and a vertical pipe flow channel 110, an electrolyte reservoir 120, an intermittent flow liquid 2, an electrolyte 3 and a disperser 4 arranged between the intermittent flow shell lower 1 and the intermittent flow shell upper 5.

[0037] Furthermore, the disperser 4 is arranged at the upper part of the vertical pipe flow channel 110, and the electrolyte reservoir 120 is located at the lower part of the vertical pipe flow channel 110, and the interior of the vertical pipe flow channel 110 is filled with intermittent flow liquid 2; the electrolyte reservoir 120 is used to contain the electrolyte 3, the intermittent flow liquid is not miscible with the electrolyte, does not chemically react, and the density of the intermittent flow liquid is lower than that of the electrolyte.

[0038] The electrolyte inlet / outlet of the flow battery continuously enters from the upper end of the intermittent flow liquid 2, and forms discontinuous droplets after encountering the disperser 4 during the flow process in the intermittent flow liquid. Finally, it aggregates at the end of the vertical pipe flow channel 110 and flows into the electrolyte reservoir 120. The electrolyte 3 then continuously flows into / out of the battery stack from the electrolyte reservoir, and the intermittent flow liquid does not flow with the electrolyte. The intermittent flow liquid in the intermittent flow structure of the liquid flow battery is not miscible with the electrolyte, and the density of the intermittent flow liquid is lower than that of the electrolyte. When the electrolyte flows under pressure through the intermittent flow liquid, it will be divided into multiple unconnected droplets by the intermittent flow liquid. Since the intermittent flow liquid is an insulating liquid, the electrolyte entering and exiting the vertical pipe flow channel will be electrically non-conductive at both ends of the vertical pipe flow channel. In this way, leakage caused by the closed loop of the conductive electrolyte when the flow battery is working will not occur, thereby improving the charging and discharging efficiency of the flow battery.

[0039] Furthermore, the structure of the disperser 4 can be in the form of an umbrella, a sieve, etc., which is conducive to the dispersion of the electrolyte.

[0040] Furthermore, the intermittent flow liquid 2 is not miscible with the electrolyte 3 and does not undergo chemical reaction, has a lower density than the electrolyte, and is an insulating liquid that is not easily volatile. For example, in iron-chromium liquid flow batteries and all-vanadium liquid flow batteries, the intermittent flow liquid can be white mineral oil and products made from white mineral oil.

[0041] Furthermore, the inner cross-sectional area of ​​the vertical pipe flow channel 110 is larger than the inner cross-sectional area of ​​the pipeline entering and exiting the vertical pipe flow channel. The cross-sectional area and length thereof as well as the volume of the electrolyte reservoir are set according to the flow rate of the battery stack to ensure that when the battery is working, the flow of the electrolyte does not allow the intermittent flow of low density to enter the electrolyte reservoir, let alone enter the battery. The flow direction of the electrolyte is to first pass through the vertical pipe flow channel and then enter the electrolyte reservoir.

[0042] like Figure 1 and Figure 2 As shown, an intermittent flow structure 8 is installed before the electrolyte inlet main channel 61 and after the electrolyte outlet main channel 62 of the liquid flow battery inlet core group, which is used to achieve intermittent disconnection between the electrolyte in the battery and the electrolyte in the shared channel, thereby blocking the leakage current network inside the liquid flow battery stack and eliminating the leakage current of the liquid flow battery stack.

[0043] Furthermore, the intermittent flow housing in the intermittent flow structure includes an intermittent flow housing lower 1 and an intermittent flow housing upper 5, which are assembled and installed, and a vertical pipe flow channel 110 and an electrolyte reservoir 120 are arranged inside the intermittent flow housing. A disperser 4 is installed on the upper part of the vertical pipe flow channel 110, wherein the structure of the disperser 4 can be a sieve-like structure, such as Figure 3a and Figure 4a As shown in; it can also be an umbrella-shaped structure, such as Figure 3b and Figure 4b The electrolyte 3 and the intermittent flow liquid 2 are sequentially filled into the intermittent flow structure, and the whole structure is an intermittent flow structure capable of realizing electrolyte interruption.

[0044] Furthermore, the intermittent flow structure 8 is fixedly connected to the pole core assembly plate frame 6 by bonding, welding or slotting. After the connection, a passage is formed between the intermittent flow structure 8 and the electrolyte inlet main channel 61 and the electrolyte outlet main channel 62 on the pole core assembly plate frame 6, so that the electrolyte 3 flowing through the intermittent flow structure 8 flows into the battery stack to realize electrochemical reaction in the reaction area 7. The intermittent flow liquid 2 is behind the electrolyte shared channel 51 and before the electrolyte outlet 52. Due to the presence of the intermittent flow liquid, the electrolyte shared channel and the electrolyte outlet are separated, so that it flows discontinuously, which greatly increases the internal resistance in the flow channel, thereby blocking the leakage current network inside the liquid flow battery stack and eliminating the leakage current of the liquid flow battery stack.

[0045] Furthermore, the intermittent flow structure is divided into a liquid inlet intermittent flow structure and a liquid outlet intermittent flow structure according to the installation position of the intermittent flow structure during the installation of the battery stack;

[0046] When the intermittent flow structure of the liquid inlet is working, the intermittent flow structure of the liquid inlet is installed at the liquid inlet of the battery stack 11, and the electrolyte outlet 52 is connected with the electrolyte liquid inlet main channel 61 on the pole core assembly plate frame 6. The electrolyte 3 of the positive electrolyte storage tank 9 or the negative electrolyte storage tank 10 in the liquid flow battery flows into the intermittent flow liquid 2 from the upper part of the vertical pipe flow channel 110 through the electrolyte shared channel 51, and changes the flow direction after encountering the disperser 4 and is dispersed into discontinuous droplets. Electrical insulation is formed during the dispersion process to prevent leakage of the liquid flow battery; after the droplets descend, they aggregate at the end of the vertical pipe flow channel and flow into the electrolyte reservoir 120, and the electrolyte then flows continuously from the electrolyte reservoir 120 into the battery stack through the electrolyte outlet 52, and the intermittent flow liquid does not flow with the electrolyte;

[0047] When the intermittent flow structure for liquid discharge is working, the intermittent flow structure for liquid discharge is installed at the liquid outlet of the battery stack 11, and the electrolyte outlet 52 is connected to the electrolyte outlet main channel 62 on the pole core assembly plate frame 6. The electrolyte 3 in the positive electrolyte storage tank 9 or the negative electrolyte storage tank 10 in the liquid flow battery flows into the intermittent flow liquid 2 from the upper part of the vertical pipe flow channel 110 through the electrolyte outlet 52. After meeting the disperser 4, the flow direction is changed and it is dispersed into discontinuous droplets. Electrical insulation is formed during the dispersion process to prevent leakage of the liquid flow battery. After the droplets descend, they aggregate at the end of the vertical pipe flow channel and then flow into the electrolyte reservoir 120. The electrolyte then flows out of the battery stack continuously from the electrolyte reservoir 120 through the electrolyte shared channel 51, and the intermittent flow liquid does not flow with the electrolyte.

[0048] A liquid flow battery stack, the liquid flow battery comprising the liquid flow battery liquid path intermittent flow structure. Each single-pole group positive electrode or negative electrode in the stack is provided with an intermittent flow structure;

[0049] It is also possible for one or more connected / staggered positive / negative electrode groups to share an intermittent flow structure;

[0050] A plurality of intermittent flow structures may also be combined to form an intermittent flow structure group, and the intermittent flow structure group is connected to the positive electrode group or the negative electrode group in the battery stack to achieve intermittent flow connection of each electrode group.

[0051] The intermittent flow structure arrangement includes: the intermittent flow structure can be arranged at a position after the electrolyte shared channel and before the flow battery stack; it can also be arranged at a position before the electrolyte shared channel and after the battery stack; the intermittent flow structure can also be arranged together with the pump 12 in a pipeline away from the electrolyte shared channel, such as Figure 5 As shown, the total positive or negative electrolyte intermittent flow connection entering or exiting the battery stack is realized to eliminate leakage current between the battery stacks. The positive electrode inlet and outlet positions and the negative electrode inlet and outlet positions in the electrolyte shared channel can also be arranged at the same time, and no intermittent flow structure is arranged between the battery stacks.

[0052] The embodiments of the present invention determine the electrolyte flow rate flowing into and out of the intermittent flow structure according to the different arrangement positions of the intermittent flow structure, thereby determining the size and shape of the vertical pipe flow channel, the disperser and the electrolyte reservoir in the intermittent flow structure, and manufacturing the intermittent flow structure suitable for different installation methods. After installing it on the battery stack, it can form a discontinuous flow of electrolyte at the arrangement position, so that the electrolyte can flow discontinuously at some positions and form electrical insulation here, thereby blocking leakage, and at the same time ensuring that the electrolyte flows continuously when entering and leaving the reaction electrode area, ensuring the stable operation of the battery. This invention achieves a significant improvement in the efficiency of liquid flow batteries and the utilization rate of electrolytes, and the present invention is simple and easy to implement, and is expected to be widely promoted and applied in various liquid flow battery fields such as all-vanadium liquid flow batteries, iron-chromium liquid flow batteries, iron-based liquid flow batteries, zinc-bromine liquid flow batteries, and organic liquid flow batteries.

[0053] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A liquid flow battery liquid path intermittent flow structure, characterized in that: The intermittent flow structure (8) comprises an intermittent flow housing; the intermittent flow housing comprises an intermittent flow housing lower portion (1) and an intermittent flow housing upper portion (5); and a vertical pipe flow channel (110), an electrolyte reservoir (120), an intermittent flow liquid (2), an electrolyte (3) and a disperser (4) arranged between the intermittent flow housing lower portion (1) and the intermittent flow housing upper portion (5); The disperser (4) is arranged at the upper part of the vertical pipe flow channel (110), the electrolyte reservoir (120) is located at the lower part of the vertical pipe flow channel (110), and the interior of the vertical pipe flow channel (110) is filled with intermittent flow liquid (2); the electrolyte reservoir (120) is used to contain electrolyte (3), the intermittent flow liquid and the electrolyte are immiscible and do not undergo chemical reaction, and the density of the intermittent flow liquid is lower than that of the electrolyte; The structure of the disperser (4) is a sieve-like structure or an umbrella-like structure; The intermittent flow structure is divided into a liquid inlet intermittent flow structure and a liquid outlet intermittent flow structure according to the installation position of the intermittent flow structure during the installation of the battery stack; In the intermittent flow structure for liquid inlet, the intermittent flow structure for liquid inlet is installed at the liquid inlet of the battery stack (11), the electrolyte outlet (52) is connected to the electrolyte inlet main channel (61) on the core assembly plate frame (6), the electrolyte (3) in the positive electrolyte storage tank (9) or the negative electrolyte storage tank (10) in the liquid flow battery flows into the intermittent flow liquid (2) from the upper part of the vertical pipe flow channel (110) through the electrolyte shared channel (51), changes the flow direction after encountering the disperser (4) and is dispersed into discontinuous droplets, and forms electrical insulation during the dispersion process to prevent leakage of the liquid flow battery; after the droplets descend, they aggregate at the end of the vertical pipe flow channel and flow into the electrolyte reservoir (120), and the electrolyte then flows continuously from the electrolyte reservoir (120) into the battery stack through the electrolyte outlet (52), and the intermittent flow liquid does not flow with the electrolyte; In the intermittent flow structure for liquid discharge, the intermittent flow structure for liquid discharge is installed at the liquid outlet of the battery stack (11), the electrolyte outlet (52) is connected to the electrolyte outlet main channel (62) on the pole core assembly plate frame (6), the electrolyte (3) in the positive electrolyte storage tank (9) or the negative electrolyte storage tank (10) in the liquid flow battery flows into the intermittent flow liquid (2) from the upper part of the vertical pipe flow channel (110) through the electrolyte outlet (52), changes the flow direction after encountering the disperser (4) and is dispersed into discontinuous droplets, and forms electrical insulation during the dispersion process to prevent leakage of the liquid flow battery; after the droplets descend, they aggregate at the end of the vertical pipe flow channel and flow into the electrolyte reservoir (120), and the electrolyte then flows out of the battery stack continuously from the electrolyte reservoir (120) through the electrolyte shared channel (51), and the intermittent flow liquid does not flow with the electrolyte.

2. The intermittent flow structure of the liquid flow battery according to claim 1, characterized in that: The intermittent flow liquid (2) is white mineral oil or an insulating liquid made from white mineral oil.

3. The intermittent flow structure of the liquid flow battery according to claim 1, characterized in that: The internal cross-sectional area of ​​the vertical pipe flow channel (110) is larger than the internal cross-sectional area of ​​the pipeline entering and exiting the vertical pipe flow channel.

4. The intermittent flow structure of the liquid flow battery according to claim 1, characterized in that: The intermittent flow structure (8) is fixedly connected to the pole core assembly plate frame (6) by bonding, welding or slotting. After the connection, a passage is formed between the intermittent flow structure (8) and the electrolyte inlet main channel (61) and the electrolyte outlet main channel (62) on the pole core assembly plate frame (6), so that the electrolyte (3) flows into the battery stack through the intermittent flow structure (8) to realize an electrochemical reaction in the reaction zone (7).

5. A liquid flow battery stack, characterized in that: The liquid flow battery comprises the liquid flow battery liquid path intermittent flow structure as claimed in any one of claims 1 to 4.

6. The flow battery stack according to claim 5, characterized in that: Each monopolar group positive or negative electrode in the stack is provided with a discontinuous flow structure; Or one or more connected / staggered positive / negative electrode groups share an intermittent flow structure; Or multiple intermittent flow structures are combined together to form an intermittent flow structure group, and the intermittent flow structure group is connected to the positive electrode group or the negative electrode group in the battery stack to achieve intermittent flow connection of each electrode group.

7. The flow battery stack according to claim 6, characterized in that: The intermittent flow structure is arranged at a position after the electrolyte shared channel and before the flow battery stack; Or arranged in front of the electrolyte shared channel and behind the battery stack; Or the intermittent flow structure is arranged at a pipeline far away from the electrolyte shared channel to realize the intermittent flow connection of the total positive or negative electrolyte entering or leaving the battery stack to eliminate the leakage current between the battery stacks.

8. The flow battery stack according to claim 6, characterized in that: The intermittent flow structure simultaneously arranges the positive electrode inlet and outlet positions and the negative electrode inlet and outlet positions in the electrolyte shared channel, and no intermittent flow structure is arranged between the battery stacks.

Images