All-vanadium redox flow battery stack

Abstract

The utility model provides an all-vanadium redox flow battery stack which comprises a common end plate, a first side end plate and a second side end plate, the common end plate is arranged between the first side end plate and the second side end plate, and a first overflowing channel and a second overflowing channel are formed in the common end plate, the first side end plate and the second side end plate; the first flow passage is used for the first electrolyte to flow through, and the second flow passage is used for the second electrolyte to flow through. By arranging the common end plate and arranging the common end plate between the first side end plate and the second side end plate, when multiple groups of electric piles are combined, the common end plate positioned in the middle can be shared by two adjacent groups of electric piles, so that the use quantity of the end plates is reduced, the quantity of parts needing to be assembled is further reduced, the complexity of operations such as positioning and aligning in the assembling process is reduced, and the assembling efficiency is improved. And the difficulty of the whole assembly preparation process is reduced. In addition, after the number of the end plates is reduced, the number of the sealing points is correspondingly reduced, so that the whole assembly process is simpler and more convenient, and the production efficiency and the product reliability are improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of liquid flow battery, and particularly relates to a full-vanadium liquid flow battery stack. BACKGROUND

[0002] The vanadium battery stack structure comprises single cells, current collecting plates, bipolar plates and end plates. In the charging and discharging process, the positive and negative electrolytes pass through the flow channels of the positive and negative electrolytes respectively, that is, the positive and negative electrolyte flow channels, to form a mutual isolation loop, so as to realize the charging and discharging function.

[0003] With the increase of the single cell level, the integration degree between the plates of the assembled stack is high, the sealing requirement is more stringent, and the electrolyte leakage risk is also increased. In order to solve this problem, in the commercial level stack assembly process, the method of grouping and pressing the stack is often used, that is, the number of levels of single cells in each group is reduced to reduce the sealing difficulty. However, this method also brings new problems, because the end plates are needed at both ends of each group, which increases the difficulty of the overall assembly preparation process to some extent. CONTENT OF THE UTILITY MODEL

[0004] Therefore, the technical problem to be solved by the application is to provide a full-vanadium liquid flow battery stack, which can reduce the number of end plates used and reduce the difficulty of the overall assembly preparation process.

[0005] In order to solve the above problems, the application provides a full-vanadium liquid flow battery stack, which comprises a shared end plate, a first side end plate and a second side end plate, the shared end plate is arranged between the first side end plate and the second side end plate, the shared end plate, the first side end plate and the second side end plate are formed with a first flow channel and a second flow channel, the first flow channel is used for flowing the first electrolyte, and the second flow channel is used for flowing the second electrolyte.

[0006] Optionally, an electrode plate is arranged between the shared end plate and the first side end plate, and an electrode plate is arranged between the shared end plate and the second side end plate.

[0007] Optionally, the first flow channel comprises a first flow section arranged on the electrode plate, the first flow channel further comprises a first liquid inlet section and a first liquid outlet section arranged on the shared end plate, and the first liquid inlet section, the first flow section and the first liquid outlet section are in communication.

[0008] Optionally, the second flow channel comprises a second flow section arranged on the electrode plate, the second flow channel further comprises a second liquid inlet section and a second liquid outlet section, the second liquid inlet section and the second liquid outlet section are arranged on the first side end plate and the second side end plate, and the second liquid inlet section, the second flow section and the second liquid outlet section are in communication.

[0009] Optionally, the common end plate is provided with a first through hole, the first liquid inlet section communicates with the first flow section through the first through hole; the common end plate is provided with a second through hole, the first liquid outlet section communicates with the first flow section through the second through hole.

[0010] Optionally, the first side end plate and the second side end plate are both provided with a third through hole, the second liquid inlet section communicates with the second flow section through the third through hole; the first side end plate and the second side end plate are both provided with a fourth through hole, the second liquid outlet section communicates with the second flow section through the fourth through hole.

[0011] Optionally, the first liquid inlet section and the first liquid outlet section are arranged in parallel, and the flow section areas of the first liquid inlet section and the first liquid outlet section are the same.

[0012] Optionally, the second liquid inlet section and the second liquid outlet section on the first side end plate are arranged in parallel and have the same flow section area; the second liquid inlet section and the second liquid outlet section on the second side end plate are arranged in parallel and have the same flow section area.

[0013] Optionally, the flow section areas of the first liquid inlet section and the first liquid outlet section are twice the flow section areas of the second liquid inlet section and the second liquid outlet section.

[0014] Optionally, the inlet of the first liquid inlet section and the outlet of the first liquid outlet section are located on the same side of the common end plate; the inlet of the second liquid inlet section and the outlet of the second liquid outlet section on the first side end plate are located on the same side of the first side end plate; the inlet of the second liquid inlet section and the outlet of the second liquid outlet section on the second side end plate are located on the same side of the second side end plate.

[0015] Beneficial effects

[0016] The full-vanadium liquid flow battery stack provided in the embodiment of the utility model, through setting common end plate, and setting common end plate between first side end plate and second side end plate, when multiple groups of electric pile combination, common end plate in middle can be shared by adjacent two groups of electric pile, reduced the use number of end plate, then reduced the number of components that need to be assembled, the complexity of positioning, alignment and other operations in the assembly process is reduced, and then the difficulty of overall assembly preparation process is reduced.In addition, after the number of end plates is reduced, the number of sealing points is also reduced, so that the overall assembly process is more simple, the production efficiency and the reliability of the product are improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the three-dimensional structure schematic view of the common end plate of the embodiment of the application;

[0018] Figure 2 Figure 1 is a structural schematic view of a common end plate, a first side end plate and a second side end plate according to an embodiment of the present application.

[0019] The reference signs are as follows:

[0020] 1, common end plate; 11, first liquid inlet section; 12, first liquid outlet section; 13, first through hole; 14, second through hole;

[0021] 2, first side end plate;

[0022] 3, second side end plate;

[0023] 41, second liquid inlet section; 42, second liquid outlet section;

[0024] 51, third through hole; 52, fourth through hole. DETAILED DESCRIPTION

[0025] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0026] In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0027] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0028] The preferred embodiments of the present application will be described below in conjunction with the drawings, and it should be understood that the preferred embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application.

[0029] With reference to Figures 1 to 2 As shown, according to the embodiment of the present application, a vanadium flow battery stack is provided, comprising a shared end plate 1, a first side end plate 2 and a second side end plate 3, the shared end plate 1 is arranged between the first side end plate 2 and the second side end plate 3, and the shared end plate 1, the first side end plate 2 and the second side end plate 3 are formed with a first flow channel and a second flow channel, the first flow channel is used for the first electrolyte to flow through, and the second flow channel is used for the second electrolyte to flow through.

[0030] By arranging the shared end plate 1 and arranging the shared end plate 1 between the first side end plate 2 and the second side end plate 3, when multiple groups of stacks are combined, the shared end plate 1 located in the middle can be shared by the adjacent two groups of stacks, reducing the number of end plates, and in turn reducing the number of components that need to be assembled, reducing the complexity of positioning, alignment and other operations in the assembly process, and in turn reducing the difficulty of the overall assembly preparation process. In addition, after reducing the number of end plates, the number of sealing points is also reduced, making the overall assembly process more simple, improving the production efficiency and the reliability of the product.

[0031] Among them, the shared end plate 1, the first side end plate 2 and the second side end plate 3 are all flat plate structures, and the shape and size of the shared end plate 1, the first side end plate 2 and the second side end plate 3 are matched.

[0032] Specifically, the first side end plate 2 and the second side end plate 3 can be arranged substantially in mirror image. The side of the shared end plate 1 facing the first side end plate 2 and the side facing the second side end plate 3 are symmetrically arranged.

[0033] Among them, the first flow channel and the second flow channel are isolated from each other to avoid mixing of the first electrolyte and the second electrolyte.

[0034] Specifically, the first electrolyte can be a positive electrolyte, and the second electrolyte can be a negative electrolyte. Correspondingly, the first flow channel is a positive flow channel, and the second flow channel is a negative flow channel.

[0035] The shared end plate 1 and the first side end plate 2 are provided with electrode plates, and the shared end plate 1 and the second side end plate 3 are provided with electrode plates.

[0036] By arranging the electrode plates, the first electrolyte and the second electrolyte can be in full contact with the corresponding electrode plates when flowing through the matched flow channels. On the surface of the electrode plate, the vanadium ions in the electrolyte undergo oxidation and reduction reaction, realizing the conversion of electrical energy and chemical energy, so as to ensure the normal charging and discharging function of the battery stack.

[0037] The electrode plate can include a bipolar plate and a monopolar plate, and in an embodiment, the electrode plate connected to the common end plate 1, the first side end plate 2 and the second side end plate 3 is a monopolar plate, and the bipolar plate is arranged between adjacent monopolar plates.

[0038] The first flow channel includes a first flow section arranged on the electrode plate, and the first flow channel further includes a first liquid inlet section 11 and a first liquid outlet section 12 arranged on the common end plate 1, and the first liquid inlet section 11, the first flow section and the first liquid outlet section 12 are in communication.

[0039] By arranging the first liquid inlet section 11, the first flow section and the first liquid outlet section 12 in communication, the first electrolyte flows into the first liquid inlet section 11, flows through the first flow section on the electrode plate to participate in the electrochemical reaction, and then flows out of the first liquid outlet section 12, thereby ensuring efficient circulation of the electrolyte in the stack, avoiding disordered flow and short circuit of the electrolyte, and improving the charging and discharging efficiency and stability of the battery.

[0040] The first flow section is a space on the electrode plate for the first electrolyte to flow through, and the space is arranged on each electrode plate, and the specific arrangement of the first flow section is not described herein.

[0041] The first liquid inlet section 11 is in communication with a liquid source of the first electrolyte, so that the first electrolyte flows into the first liquid inlet section 11, flows through the first flow section to participate in the reaction, and then flows into the first liquid outlet section 12, and finally flows out of the first liquid outlet section 12.

[0042] The second flow channel includes a second flow section arranged on the electrode plate, and the second flow channel further includes a second liquid inlet section 41 and a second liquid outlet section 42, and the second liquid inlet section 41 and the second liquid outlet section 42 are arranged on the first side end plate 2 and the second side end plate 3, and the second liquid inlet section 41, the second flow section and the second liquid outlet section 42 are in communication.

[0043] By arranging the second liquid inlet section 41, the second flow section and the second liquid outlet section 42 in communication, the second electrolyte flows into the second liquid inlet section 41, flows through the second flow section on the electrode plate to participate in the electrochemical reaction, and then flows out of the second liquid outlet section 42, thereby ensuring efficient circulation of the electrolyte in the stack, avoiding disordered flow and short circuit of the electrolyte, and improving the charging and discharging efficiency and stability of the battery.

[0044] The second flow section is a space on the electrode plate for the second electrolyte to flow through, and the space is arranged on each electrode plate, and the specific arrangement of the second flow section is not described herein.

[0045] The first flow section and the second flow section can be arranged on two sides of the bipolar plate.

[0046] The second liquid inlet section 41 is communicated with the liquid source of the second electrolyte, so that the second electrolyte flows into the second liquid inlet section 41, flows through the second flow section to participate in the reaction, and then flows into the second liquid outlet section 42, and finally flows out of the second liquid outlet section 42.

[0047] The common end plate 1 is provided with a first through hole 13, and the first liquid inlet section 11 is communicated with the first flow section through the first through hole 13. The common end plate 1 is provided with a second through hole 14, and the first liquid outlet section 12 is communicated with the first flow section through the second through hole 14.

[0048] By arranging the first through hole 13 and the second through hole 14 on the common end plate 1, the first liquid inlet section 11 and the first flow section are communicated, and the first liquid outlet section 12 and the first flow section are communicated, so that the first electrolyte can flow in order.

[0049] Specifically, the first electrolyte flows into the first flow section of the electrode plate in order from the first liquid inlet section 11 through the first through hole 13, and then flows into the first liquid outlet section 12 through the second through hole 14 after completing the electrochemical reaction. The problem of electrolyte disorder and short circuit is reduced, the stable reaction environment in the battery stack is ensured, the charging and discharging process is stable and efficient, the energy loss is reduced, and the battery performance is improved.

[0050] In one embodiment, as shown in Figure 1 The first liquid inlet section 11 can be provided with four first through holes 13, two of which are located at the middle position of the length of the first liquid inlet section 11, and the two first through holes 13 are oppositely arranged along the thickness direction of the common end plate 1, so that part of the first electrolyte can flow into the electrode plate between the common end plate 1 and the first side end plate 2 through one of the first through holes 13, and part of the first electrolyte can flow into the electrode plate between the common end plate 1 and the second side end plate 3 through the other first through hole 13.

[0051] The other two first through holes 13 are located at the end of the length of the first liquid inlet section 11, that is, the end away from the inlet of the first liquid inlet section 11, and the two first through holes 13 are oppositely arranged along the thickness direction of the common end plate 1, so that part of the first electrolyte can flow into the electrode plate between the common end plate 1 and the first side end plate 2 through one of the first through holes 13, and part of the first electrolyte can flow into the electrode plate between the common end plate 1 and the second side end plate 3 through the other first through hole 13.

[0052] In one embodiment, as shown in Figure 1As shown, four second through holes 14 can be provided on the first drainage section 12, two of which are located at the middle position of the length of the first drainage section 12, and the two second through holes 14 are arranged opposite to each other along the thickness direction of the common end plate 1, so that the first electrolyte between the common end plate 1 and the first side end plate 2 can flow into the first drainage section 12 through one of the second through holes 14, and the first electrolyte between the common end plate 1 and the second side end plate 3 can flow into the first drainage section 12 through the other second through hole 14.

[0053] The other two second through holes 14 are located at the head end of the first drainage section 12 along its length, that is, at the end away from the outlet of the first drainage section 12. The two second through holes 14 are also arranged opposite each other along the thickness direction of the common end plate 1, so that the first electrolyte between the common end plate 1 and the first side end plate 2 can flow into the first drainage section 12 through one of the second through holes 14, and the first electrolyte between the common end plate 1 and the second side end plate 3 can flow into the first drainage section 12 through the other second through hole 14.

[0054] The first through hole 13 and the second through hole 14 are respectively arranged with the liquid passage holes on the corresponding electrode plates along the thickness direction, so that the first electrolyte can flow smoothly.

[0055] Both the first side end plate 2 and the second side end plate 3 are provided with a third through hole 51, and the second liquid inlet section 41 is connected to the second flow section through the third through hole 51. Both the first side end plate 2 and the second side end plate 3 are provided with a fourth through hole 52, and the second liquid outlet section 42 is connected to the second flow section through the fourth through hole 52.

[0056] By providing the third through-hole 51 and the fourth through-hole 52, a clear and smooth path is provided for the circulation of the second electrolyte within the battery stack. The second electrolyte flows from the second inlet section 41 into the second flow section of the electrode plate through the third through-hole 51, fully participates in the electrochemical reaction, and then flows out through the fourth through-hole 52 into the second outlet section 42. This ensures the orderly circulation of the second electrolyte and guarantees the stability and continuity of the battery stack's charging and discharging process.

[0057] In one embodiment, such as Figure 1 As shown, two third through holes 51 can be provided on the second liquid inlet section 41 of the first side end plate 2. One third through hole 51 is located at the middle position of the length of the second liquid inlet section 41, and the other third through hole 51 is located at the end of the length of the second liquid inlet section 41, that is, at the end away from the inlet of the second liquid inlet section 41, so that the second electrolyte can flow into the electrode plate between the common end plate 1 and the first side end plate 2 through the two third through holes 51 respectively.

[0058] The second side end plate 3 can be provided with two third through holes 51 on the second liquid inlet section 41, one of which is located at the middle of the length of the second liquid inlet section 41, and the other is located at the end of the length of the second liquid inlet section 41, that is, the end away from the inlet of the second liquid inlet section 41, so that the second electrolyte can flow into the electrode plates between the common end plate 1 and the second side end plate 3 through the two third through holes 51 respectively.

[0059] In one embodiment, as shown in Figure 1 The first side end plate 2 can be provided with two fourth through holes 52 on the second liquid outlet section 42, one of which is located at the middle of the length of the second liquid outlet section 42, and the other is located at the head of the length of the second liquid outlet section 42, that is, the end away from the outlet of the second liquid outlet section 42, so that the second electrolyte can enter the second liquid outlet section 42 from between the common end plate 1 and the first side end plate 2 through the two fourth through holes 52 respectively.

[0060] The second side end plate 3 can be provided with two fourth through holes 52 on the second liquid outlet section 42, one of which is located at the middle of the length of the second liquid outlet section 42, and the other is located at the head of the length of the second liquid outlet section 42, that is, the end away from the outlet of the second liquid outlet section 42, so that the second electrolyte can enter the second liquid outlet section 42 from between the common end plate 1 and the second side end plate 3 through the two fourth through holes 52 respectively.

[0061] Among them, the third through hole 51 and the fourth through hole 52 are arranged in the thickness direction corresponding to the liquid through hole on the corresponding electrode plate, so that the second electrolyte can flow smoothly.

[0062] The first liquid inlet section 11 and the first liquid outlet section 12 are arranged in parallel, and the flow area of the first liquid inlet section 11 and the first liquid outlet section 12 is the same.

[0063] By arranging the first liquid inlet section 11 and the first liquid outlet section 12 in parallel and having the same flow area, the flow stability of the first electrolyte when flowing into and out of the stack is ensured, and the first electrolyte flows uniformly in the stack, so that each part of the electrode plate can be fully contacted with the same amount and speed of the first electrolyte, and the efficiency and stability of the electrochemical reaction are improved.

[0064] Among them, the first liquid inlet section 11 and the first liquid outlet section 12 extend along a straight line.

[0065] Among them, as shown in Figure 1 The common end plate 1 is rectangular, the first liquid inlet section 11 and the first liquid outlet section 12 extend along the length direction of the common end plate 1, and are respectively located at both sides in the width direction.

[0066] The second liquid inlet section 41 on the first side end plate 2 is parallel to the second liquid outlet section 42, and the flow area is the same. The second liquid inlet section 41 on the second side end plate 3 is parallel to the second liquid outlet section 42, and the flow area is the same.

[0067] By arranging the second liquid inlet section 41 and the second liquid outlet section 42 in parallel and having the same flow area, the flow rate of the second electrolyte is stable when flowing into and out of the stack, ensuring uniform flow of the second electrolyte in the stack, so that each part of the electrode plate can fully contact with the same amount and speed of the second electrolyte, improving the efficiency and stability of the electrochemical reaction.

[0068] The second liquid inlet section 41 and the second liquid outlet section 42 are both linearly extended.

[0069] As shown in the figure, Figure 1 The first side end plate 2 and the second side end plate 3 are both rectangular, and the second liquid inlet section 41 and the second liquid outlet section 42 are both extended along the length direction of the common end plate 1, and are respectively located on both sides of the width direction of the first side end plate 2 and the second side end plate 3.

[0070] The flow area of the first liquid inlet section 11 and the first liquid outlet section 12 is twice that of the second liquid inlet section 41 and the second liquid outlet section 42 respectively.

[0071] The flow area of the first liquid inlet section 11 is twice that of the second liquid inlet section 41, and also twice that of the second liquid outlet section 42. The flow area of the first liquid outlet section 12 is twice that of the second liquid inlet section 41, and also twice that of the second liquid outlet section 42.

[0072] That is, the flow area of the first liquid inlet section 11 is the same as that of the first liquid outlet section 12, for example, A. The flow area of the second liquid inlet section 41 is the same as that of the second liquid outlet section 42, for example, B. A is twice B.

[0073] The inlet of the first liquid inlet section 11 and the outlet of the first liquid outlet section 12 are located on the same side of the common end plate 1. The inlet of the second liquid inlet section 41 and the outlet of the second liquid outlet section 42 on the first side end plate 2 are located on the same side of the first side end plate 2. The inlet of the second liquid inlet section 41 and the outlet of the second liquid outlet section 42 on the second side end plate 3 are located on the same side of the second side end plate 3.

[0074] By arranging the inlet of the first liquid inlet section 11 and the outlet of the first liquid outlet section 12 on the same side of the common end plate 1, and arranging the inlet of the second liquid inlet section 41 and the outlet of the second liquid outlet section 42 on the same side of the first side end plate 2 and the second side end plate 3 respectively, the inlet and outlet of each part of the battery stack are relatively concentrated, which simplifies the connection mode of the external electrolyte conveying pipeline, reduces the intersection and winding of the pipeline, and reduces the complexity and difficulty of pipeline connection.

[0075] The inlet of the first liquid inlet section 11 and the outlet of the first liquid outlet section 12, the inlet of the second liquid inlet section 41 and the outlet of the second liquid outlet section 42 on the first side end plate 2, and the inlet of the second liquid inlet section 41 and the outlet of the second liquid outlet section 42 on the second side end plate 3 are all located on the same side of the stack.

[0076] Specifically, the first side end plate 2, the common end plate 1 and the second side end plate 3 are all substantially rectangular structures, and each inlet and outlet is formed on a sidewall in a width direction of the rectangular structure.

[0077] As shown in the figure, the arrows in the figure represent the flow directions of the first electrolyte and the second electrolyte. Figure 2 Figure 2 The arrows in the figure represent the flow directions of the first electrolyte and the second electrolyte.

[0078] Specifically, the arrow marked on the first liquid inlet section 11 represents the direction of the first electrolyte flowing into the first liquid inlet section 11. The arrow from the first via hole 13 and pointing to the first side end plate 2 and the second side end plate 3 represents the direction of the first electrolyte flowing from the first via hole 13 to the first side end plate 2 and the second side end plate 3. The arrow from the first side end plate 2 and the second side end plate 3 and pointing to the second via hole 14 represents the direction of the first electrolyte flowing to the first liquid outlet section 12. The arrow marked on the first liquid outlet section 12 represents the direction of the first electrolyte flowing out of the first liquid outlet section 12.

[0079] Specifically, the arrow marked on the second liquid inlet section 41 represents the direction of the second electrolyte flowing into the second liquid inlet section 41. The arrow from the third via hole 51 and pointing to the common end plate 1 represents the direction of the second electrolyte flowing from the third via hole 51 to the common end plate 1. The arrow from the common end plate 1 and pointing to the fourth via hole 52 represents the direction of the second electrolyte flowing to the second liquid outlet section 42. The arrow marked on the second liquid outlet section 42 represents the direction of the second electrolyte flowing out of the second liquid outlet section 42.

[0080] A first guide surface is formed on the inner wall surface of the first liquid inlet section 11 away from the inlet, and the first guide surface extends to the side of the first via hole 13, thereby guiding the flow of the first electrolyte flowing in.

[0081] Specifically, the two first guide surfaces form a herringbone shape, that is, the inner wall surface substantially forms a herringbone shape.

[0082] A second guide surface is formed on the inner wall surface of the second liquid inlet section 41 away from the inlet, and the second guide surface extends to the side of the third via hole 51, thereby guiding the flow of the second electrolyte flowing in.

[0083] Those skilled in the art will readily understand that the above advantageous modes can be freely combined and superimposed without conflict.​

[0084] The above merely provides the preferred embodiment of the present application, and not intended to limit the present application. Any modification, equivalent replacement and improvement made within the principle and technical scope of the present application shall be included in the protection scope of the present application. The above merely provides the preferred embodiment of the present application, and not intended to limit the present application. Any modification, equivalent replacement and improvement made within the principle and technical scope of the present application shall be included in the protection scope of the present application.

Claims

1. An all-vanadium redox flow battery stack, characterised in that, The application relates to a shared end plate (1), a first side end plate (2) and a second side end plate (3), wherein the shared end plate (1) is arranged between the first side end plate (2) and the second side end plate (3), and first and second flow channels are formed on the shared end plate (1), the first side end plate (2) and the second side end plate (3), wherein the first flow channel is used for the flow of a first electrolyte, and the second flow channel is used for the flow of a second electrolyte.

2. The vanadium redox flow battery stack of claim 1, wherein, An electrode plate is arranged between the shared end plate (1) and the first side end plate (2), and an electrode plate is arranged between the shared end plate (1) and the second side end plate (3).

3. The vanadium redox flow battery stack of claim 2, wherein, The first flow channel comprises a first flow section arranged on the electrode plate, and the first flow channel further comprises a first liquid inlet section (11) and a first liquid outlet section (12) arranged on the shared end plate (1), wherein the first liquid inlet section (11), the first flow section and the first liquid outlet section (12) are in communication.

4. The vanadium redox flow battery stack of claim 3, wherein, The second flow channel comprises a second flow section arranged on the electrode plate, and the second flow channel further comprises a second liquid inlet section (41) and a second liquid outlet section (42), wherein the second liquid inlet section (41) and the second liquid outlet section (42) are arranged on the first side end plate (2) and the second side end plate (3), and the second liquid inlet section (41), the second flow section and the second liquid outlet section (42) are in communication.

5. The vanadium redox flow battery stack of claim 4, wherein, A first through hole (13) is arranged on the shared end plate (1), and the first liquid inlet section (11) is in communication with the first flow section through the first through hole (13). A second through hole (14) is arranged on the shared end plate (1), and the first liquid outlet section (12) is in communication with the first flow section through the second through hole (14).

6. The vanadium redox flow battery stack of claim 5, wherein, Third through holes (51) are arranged on the first side end plate (2) and the second side end plate (3), and the second liquid inlet section (41) is in communication with the second flow section through the third through holes (51). Fourth through holes (52) are arranged on the first side end plate (2) and the second side end plate (3), and the second liquid outlet section (42) is in communication with the second flow section through the fourth through holes (52).

7. The vanadium redox flow battery stack of claim 3, wherein, The first liquid inlet section (11) and the first liquid outlet section (12) are arranged in parallel, and the flow cross-sectional areas of the first liquid inlet section (11) and the first liquid outlet section (12) are the same.

8. The vanadium redox flow battery stack of claim 4, wherein, The second liquid inlet section (41) and the second liquid outlet section (42) on the first side end plate (2) are arranged in parallel and have the same flow cross-sectional area. The second liquid inlet section (41) and the second liquid outlet section (42) on the second side end plate (3) are arranged in parallel and have the same flow cross-sectional area.

9. The vanadium redox flow battery stack of claim 4, wherein, The flow cross-sectional areas of the first liquid inlet section (11) and the first liquid outlet section (12) are twice the flow cross-sectional areas of the second liquid inlet section (41) and the second liquid outlet section (42).

10. The vanadium redox flow battery stack of claim 4, wherein, The inlet of the first liquid inlet section (11) and the outlet of the first liquid outlet section (12) are located on the same side of the shared end plate (1). The inlet of the second liquid inlet section (41) and the outlet of the second liquid outlet section (42) on the first side end plate (2) are located on the same side of the first side end plate (2); The inlet of the second liquid inlet section (41) and the outlet of the second liquid outlet section (42) on the second side end plate (3) are located on the same side of the second side end plate (3).

Images