Pole frame, flow battery and flow battery stack

Abstract

The utility model provides a pole frame, a flow battery and a flow battery stack. The electrode frame comprises a frame body, a liquid inlet area, an active area and a liquid outlet area, the liquid inlet area, the active area and the liquid outlet area are located in the frame body, the frame body is provided with a first side edge and a second side edge which extend in the first direction on the two sides of the active area respectively, and the liquid inlet area and the liquid outlet area each comprise at least one liquid inlet unit and at least one liquid outlet unit. Each group of liquid inlet units comprises at least two first liquid inlet holes and at least two second liquid inlet holes, and a liquid inlet main flow channel is formed between one of the at least two first liquid inlet holes and one of the at least two second liquid inlet holes; each group of liquid outlet units comprises at least two first liquid outlet holes and at least two second liquid outlet holes, and a liquid outlet main flow channel is formed between one of the at least two first liquid outlet holes and one of the at least two second liquid outlet holes. The electrode frame, the flow battery and the electric pile have the advantages of high electric pile key material utilization rate, low electric pile cost and high power.

Description

Technical Field

[0001] The present application mainly relates to the field of liquid flow batteries, and in particular to a pole frame, a liquid flow battery and a liquid flow battery stack. Background Art

[0002] Vanadium Redox Flow Battery (VRFB) is an important energy storage technology that uses vanadium to transform between different oxidation states to store charge and release it when needed. Due to the advantages of adjustable capacity, long life and high safety, vanadium redox flow battery is particularly suitable for large-scale energy storage, such as smooth output of renewable energy and grid regulation. With the increase in demand for renewable energy, flow battery technologies such as VRFB have important development prospects in energy storage.

[0003] The fuel cell stack is the core component of the all-vanadium liquid flow battery. Improving the efficiency of the fuel cell stack involves the process of improving energy conversion efficiency, reducing energy loss and improving system performance. With the expansion of the commercial application of VRFB, some large-scale commercial projects require short-process fuel cells to reduce fuel cell stack concentration polarization, reduce system pump consumption, and improve system energy conversion efficiency. However, in the short-process fuel cell stack structure in the prior art, the pole frame guide area accounts for a large proportion, and the active area in the pole frame accounts for a small proportion, resulting in a very low utilization rate of key materials in the fuel cell stack, increasing the cost of the fuel cell stack; and usually only a single-direction liquid inlet and outlet flow channel is provided. When the pole frame guide area is relatively long, the reaction of the electrolyte in the active area will produce concentration polarization, which reduces the performance of the fuel cell stack. Utility Model Content

[0004] The technical problem to be solved by the present application is to provide an electrode frame, a liquid flow battery and a liquid flow battery stack with high utilization rate of key materials of the battery stack, low battery stack cost and high power.

[0005] To solve the above technical problems, the present application provides a pole frame suitable for a liquid flow battery, wherein the pole frame includes a frame body and a liquid inlet area, an active area and a liquid outlet area located in the frame body, wherein the frame body has a first side and a second side extending along a first direction on both sides of the active area, respectively, and the liquid inlet area includes at least one group of liquid inlet units, and the liquid outlet area includes at least one group of liquid outlet units, wherein each group of liquid inlet units includes at least two first liquid inlet holes located at a first position on the first side and at least two second liquid inlet holes located at a second position on the first side, and a liquid inlet main channel is formed between one of the at least two first liquid inlet holes and one of the at least two second liquid inlet holes; each group of liquid outlet units includes at least two first liquid outlet holes located at a third position on the second side and at least two second liquid outlet holes located at a fourth position on the second side, and a liquid outlet main channel is formed between one of the at least two first liquid outlet holes and one of the at least two second liquid outlet holes; and the electrolyte in the liquid flow battery is suitable for flowing from the liquid inlet main channel into the active area and flowing out from the liquid outlet main channel.

[0006] In one embodiment of the present application, the liquid inlet main channel includes a first liquid inlet main channel and a second liquid inlet main channel, and the liquid outlet main channel includes a first liquid outlet main channel and a second liquid outlet main channel; wherein the electrolyte is suitable for flowing into the first liquid inlet main channel from the first liquid inlet hole, and flowing into the second liquid inlet main channel from the second liquid inlet hole; the electrolyte is suitable for flowing out from the first liquid outlet main channel through the first liquid outlet hole, and flowing out from the second liquid outlet main channel through the second liquid outlet hole.

[0007] In one embodiment of the present application, the height of the first liquid inlet main channel in a second direction perpendicular to the first direction gradually increases from a position close to the first liquid inlet hole to a position far away from the first liquid inlet hole, and the height of the second liquid inlet main channel in the second direction gradually increases from a position close to the second liquid inlet hole to a position far away from the second liquid inlet hole; the height of the first liquid outlet main channel in the second direction gradually increases from a position close to the first liquid outlet hole to a position far away from the first liquid outlet hole, and the height of the second liquid outlet main channel in the second direction gradually increases from a position close to the second liquid outlet hole to a position far away from the second liquid outlet hole.

[0008] In one embodiment of the present application, the end of the first liquid inlet main channel close to the first liquid inlet hole and the end of the second liquid inlet main channel close to the second liquid inlet hole have a first height in the second direction, the end of the first liquid inlet main channel away from the first liquid inlet hole and the end of the second liquid inlet main channel away from the second liquid inlet hole have a second height in the second direction, and the ratio P1 of the first height to the second height satisfies: 1.2≤P1≤3.

[0009] In one embodiment of the present application, the end of the first liquid outlet main channel close to the first liquid outlet hole and the end of the second liquid outlet main channel close to the second liquid outlet hole have a third height in the second direction, the end of the first liquid outlet main channel away from the first liquid outlet hole and the end of the second liquid outlet main channel away from the second liquid outlet hole have a fourth height in the second direction, and the ratio P2 of the third height to the fourth height satisfies: 1.2≤P2≤3.

[0010] In one embodiment of the present application, the length of the active area along the first direction is equal to the total length of all liquid inlet units along the first direction, and the height of the active area along a second direction perpendicular to the first direction is equal to the distance between the liquid inlet unit and the liquid outlet unit along the second direction; and the ratio a of the length of the active area along the first direction to the height of the active area along the second direction satisfies: a≥3.

[0011] In one embodiment of the present application, the pole frame further includes a plurality of guide groove units located near the liquid inlet main channel and the liquid outlet main channel, and each guide groove unit includes a plurality of guide grooves arranged along the first direction.

[0012] In one embodiment of the present application, in the guide groove unit located below the main liquid inlet channel, the height of the guide groove in the second direction perpendicular to the first direction gradually increases from a position close to the first liquid inlet hole or the second liquid inlet hole to a position away from the first liquid inlet hole or the second liquid inlet hole; in the guide groove unit located above the main liquid outlet channel, the height of the guide groove in the second direction gradually increases from a position close to the first liquid outlet hole or the second liquid outlet hole to a position away from the first liquid outlet hole or the second liquid outlet hole.

[0013] In one embodiment of the present application, a width W of the guide groove along the first direction satisfies: 1 mm ≤ W ≤ 10 mm, and a height H of the guide groove along the second direction satisfies: 1 mm ≤ H ≤ 10 mm.

[0014] The present application also provides a liquid flow battery, including an ion membrane, a bipolar plate and a pole frame as in any of the previous embodiments, the ion membrane has a plurality of first openings, the bipolar plate has a plurality of second openings, and in the liquid flow battery: the plurality of first openings correspond to the total number and positions of the first liquid inlet hole, the second liquid inlet hole, the first liquid outlet hole and the second liquid outlet hole; the plurality of second openings correspond to the total number and positions of the first liquid inlet hole, the second liquid inlet hole, the first liquid outlet hole and the second liquid outlet hole.

[0015] The present application also provides a liquid flow battery stack, comprising a plurality of liquid flow batteries as described in the previous embodiment.

[0016] Compared with the prior art, the present application provides a pole frame, a liquid flow battery and a liquid flow battery stack, in which the pole frame includes at least one group of liquid inlet units and at least one group of liquid outlet units, and the electrolyte is suitable for flowing into the liquid inlet unit through two liquid inlet holes and flowing towards each other, and finally flowing out from the liquid outlet unit through two liquid outlet holes, and the active area accounts for a relatively large proportion. Under the premise of ensuring the uniformity of the electrolyte flow, the utilization rate of key materials of the battery stack can be significantly improved, and the battery stack has low cost and high power. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are included to provide a further understanding of the present application. They are included and constitute a part of the present application. The accompanying drawings illustrate embodiments of the present application and together with the present specification serve to explain the principles of the present application. In the accompanying drawings:

[0018] Figure 1 is a front view of a pole frame of the present application;

[0019] Figure 2 This application is Figure 1 A schematic diagram of the outline of the first liquid inlet main channel of the pole frame shown;

[0020] Figure 3 is a front view of another pole frame of the present application;

[0021] Figure 4 is a front view of a bipolar plate of a flow battery of the present application; and

[0022] Figure 5 It is a front view of an ion membrane of a liquid flow battery of the present application. DETAILED DESCRIPTION

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for the description of the embodiments. Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, the present application can also be applied to other similar scenarios based on these drawings without creative work. Unless it is obvious from the language environment or otherwise explained, the same reference numerals in the figures represent the same structure or operation.

[0024] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "an" and / or "the" do not refer to the singular and may also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0025] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0026] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0027] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0028] In addition, it should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meaning and cannot be understood as limiting the scope of protection of this application. In addition, although the terms used in this application are selected from well-known and commonly used terms, some terms mentioned in the specification of this application may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description of this article. In addition, it is required to understand this application not only by the actual terms used, but also by the meaning implied by each term.

[0029] It should be understood that when a component is referred to as being “on another component,” “connected to another component,” “coupled to another component,” or “contacting another component,” it can be directly on, connected to, coupled to, or contacting the other component, or intervening components may be present. In contrast, when a component is referred to as being “directly on another component,” “directly connected to,” “directly coupled to,” or “directly contacting” another component, there are no intervening components present.

[0030] Figure 1 It is a front view of a pole frame of the present application, Figure 2 This application is Figure 1 The schematic diagram of the outline of the first liquid inlet main channel of the pole frame shown. Figure 1-2 As shown, the present application provides a pole frame 11 suitable for a liquid flow battery, comprising a frame 100 and a liquid inlet area 110, a liquid outlet area 120 and an active area 130 located in the frame 100. The frame 100 is as shown in FIG. Figure 1 The upper and lower sides shown have a first side 101 and a second side 102 extending along a first direction AA', respectively. The liquid inlet area 110, the active area 130 and the liquid outlet area 120 are arranged in sequence along a second direction BB' perpendicular to the first direction AA', that is, the active area 130 is located between the liquid inlet area 110 and the liquid outlet area 120, and the active area 130 is hollow in design, suitable for placing active electrodes.

[0031] In such Figure 1In the illustrated embodiment, the liquid inlet area 110 includes a group of liquid inlet units 110a, and the liquid inlet unit 110a includes two first liquid inlet holes 111 and 112 located at a first position of the first side 101 and two second liquid inlet holes 113 and 114 located at a second position of the first side 101. Specifically, the first position and the second position are respectively the positions of the first side 101 in the first direction AA'. It can be understood that the first liquid inlet holes 111 and 112 are opposite to each other along the second direction BB', and the second liquid inlet holes 113 and 114 are opposite to each other along the second direction BB'. And in this embodiment, the first liquid inlet hole 111 and the second liquid inlet hole 113 are opposite to each other in the first direction AA', and the first liquid inlet hole 112 and the second liquid inlet hole 114 are opposite to each other in the first direction AA'.

[0032] Furthermore, in this embodiment, a liquid inlet main channel 115 is formed between the first liquid inlet hole 111 and the second liquid inlet hole 114, and the electrolyte in the flow battery is suitable for flowing from the liquid inlet main channel 115 into the active area 130. In this embodiment, the liquid inlet main channel 115 includes a first liquid inlet main channel 116 and a second liquid inlet main channel 117, and the electrolyte is suitable for flowing from the first liquid inlet hole 111 into the first liquid inlet main channel 116, and from the second liquid inlet hole 114 into the second liquid inlet main channel 117.

[0033] It should be noted that there is actually no absolute spatial division between the first liquid inlet main channel 116 and the second liquid inlet main channel 117, and it is only for the convenience of description. Figure 1 The two together constitute the main liquid inlet channel 115. The electrolyte flows in the first main liquid inlet channel 116 from Figure 1 As shown, the liquid flows from the left side to the right side, and in the second liquid inlet main channel 117, the liquid flows from the Figure 1 As shown, it flows from the right side to the left side, that is, the electrolyte enters the liquid inlet main channel 115 from the first liquid inlet hole 111 and the second liquid inlet hole 114 in two directions, and the two parts of the electrolyte flow in opposite directions in the areas of the first liquid inlet main channel 116 and the second liquid inlet main channel 117, so that the electrolyte entering the active area is distributed more evenly.

[0034] Furthermore, in Figure 1-2 In the preferred embodiment shown in FIG. 1 , the heights of the first liquid inlet main channel 116 and the second liquid inlet main channel 117 in the second direction BB' are not constant during the process of extending along the first direction AA'. Specifically, the height of the first liquid inlet main channel 116 in the second direction BB' is from a position close to the first liquid inlet hole 111 to a position far from the first liquid inlet hole 111 (i.e., Figure 1 The height of the second liquid inlet main channel 117 in the second direction BB' increases from a position close to the second liquid inlet hole 114 to a position far from the second liquid inlet hole 114 (ie, as shown in FIG. Figure 1This arrangement can further improve the uniformity of the electrolyte distribution into the active area.

[0035] like Figure 2 FIG. 1 is a schematic diagram of the outline of the first liquid inlet main channel 116, referring to FIG. Figure 2 As shown, the shape of the first liquid inlet main channel 116 is approximately a trapezoid, the short side of the trapezoid is the end of the first liquid inlet main channel 116 close to the first liquid inlet port 111, the long side is the end of the first liquid inlet main channel 116 close to the second liquid inlet port 114, and the height of the trapezoid is the length of the first liquid inlet main channel 116 along the first direction AA'. The shape of the second liquid inlet channel 117 is Figure 2 The left-right flipping of the figure shown will not be described again. Specifically, in this embodiment, the end of the first liquid inlet main channel 116 close to the first liquid inlet hole 111 ( Figure 1 The left end shown in FIG. 1 ), the end of the second liquid inlet main channel 117 close to the second liquid inlet hole 114 ( Figure 1 The first liquid inlet main channel 116 has a first height H1 in the second direction BB', and the end ( Figure 1 The right end shown in FIG. 1 ), the end of the second liquid inlet main channel 117 away from the second liquid inlet hole 114 ( Figure 1 The left end as shown in the figure has a second height H2 in the second direction, and the ratio of the first height H1 to the second height H2 satisfies: 1.2≤H2 / H1≤3.

[0036] Similarly, in this embodiment, the liquid outlet area 120 includes a group of liquid outlet units 120a, and the liquid outlet unit 120a includes two first liquid outlet holes 121 and 122 located at the third position of the second side 102 and two second liquid outlet holes 113 and 114 located at the fourth position of the second side 102, the first liquid outlet holes 121 and 122 are opposite to each other along the second direction BB', the second liquid outlet holes 113 and 114 are opposite to each other along the second direction BB', the first liquid outlet hole 121 and the second liquid outlet hole 123 are opposite to each other in the first direction AA', and the first liquid outlet hole 122 and the second liquid outlet hole 124 are opposite to each other in the first direction AA'.

[0037] In this embodiment, a liquid outlet main channel 125 is formed between the first liquid outlet hole 121 and the second liquid outlet hole 124. The electrolyte in the flow battery is suitable for flowing out from the liquid outlet main channel 125 from the active area 130, and the liquid outlet main channel 125 includes a first liquid outlet main channel 126 and a second liquid outlet main channel 127. The electrolyte flows out from the first liquid outlet main channel 126 through the first liquid outlet hole 121, and flows out from the second liquid outlet main channel 127 through the second liquid outlet hole 124. Similar to the liquid inlet area 110, the electrolyte also flows in opposite directions in the first liquid outlet main channel 126 and the second liquid outlet main channel 127.

[0038] Similarly, in this embodiment, the height of the first liquid outlet main channel 126 in the second direction BB' gradually increases from a position close to the first liquid outlet hole 121 to a position far from the first liquid outlet hole 121, and the height of the second liquid outlet main channel 127 in the second direction BB' gradually increases from a position close to the second liquid outlet hole 124 to a position far from the second liquid outlet hole 124, and the end of the first liquid outlet main channel 126 close to the first liquid outlet hole 121 ( Figure 1 The left end shown in FIG. 1 ), the end of the second liquid outlet main channel 127 close to the second liquid outlet hole 124 ( Figure 1 The first liquid outlet main channel 126 is far away from the end of the first liquid outlet hole 121 ( Figure 1 The second liquid outlet main channel 127 is far away from the end of the second liquid outlet hole 124 ( Figure 1 The left end shown in the figure has a fourth height in the second direction BB', and the ratio of the third height to the fourth height satisfies: 1.2≤fourth height / third height≤3.

[0039] It is understood that the pole frame for the flow battery includes a positive pole frame and a negative pole frame, and the positive pole frame and the negative pole frame share a liquid inlet and a liquid outlet suitable for the inflow / outflow of electrolyte. Figure 1 The pole frame 11 shown can be a positive pole frame or a negative pole frame, so it can be understood that when Figure 1 When the positive pole frame is shown, the negative pole frame needs to use the liquid inlet and liquid outlet holes not occupied by the positive pole frame, namely the first liquid inlet hole 112 , the second liquid inlet hole 113 , the first liquid outlet hole 122 and the second liquid outlet hole 123 .

[0040] In such Figure 1 In the illustrated embodiment, the length of the active area 130 along the first direction AA' is equal to the total length of the liquid inlet unit 110a along the first direction AA', the height of the active area 130 along the second direction BB' is equal to the distance between the liquid inlet unit 110a and the liquid outlet unit 120a along the second direction BB', and the ratio a of the length of the active area 130 along the first direction AA' to the height of the active area 130 along the second direction BB' satisfies: a≥3.

[0041] Furthermore, in this embodiment, the pole frame 11 also includes four guide slot units 141, 142, 143, 144 located below the liquid inlet main channel 115 and the liquid outlet main channel 125, and each guide slot unit 141, 142, 143, 144 includes a plurality of guide slots 140 arranged along the first direction AA'. In the guide groove units 141, 142 located below the liquid inlet main channel 115, the height of the guide groove 140 in the second direction BB' gradually increases from a position close to the first liquid inlet holes 111, 112 to a position away from the first liquid inlet holes 111, 112; in the guide groove units 143, 144 located below the liquid outlet main channel 127, the height of the guide groove 140 in the second direction BB' gradually increases from a position close to the second liquid outlet holes 123, 124 to a position away from the second liquid outlet holes 123, 124. This arrangement is to divide the first liquid inlet main channel 116, the second liquid inlet main channel 117, the first liquid outlet main channel 126 and the second liquid outlet main channel 127 with gradually changing heights in the liquid inlet area 110 and the liquid outlet area 120.

[0042] Preferably, in this embodiment, the width of the guide groove 140 along the first direction AA' (denoted by W) satisfies: 1mm≤W≤10mm, and the height of the guide groove 140 along the second direction BB' (denoted by H) satisfies: 1mm≤H≤10mm.

[0043] In some other implementations of the present application, the liquid inlet area and the liquid outlet area may include more groups of liquid inlet units and liquid outlet units. Figure 3 This is a front view of another pole frame of the present application, combined with reference Figure 1 , 3 As shown, Figure 1 Compared with the embodiment shown. Figure 3 In the embodiment shown, the liquid inlet area 110' of the pole frame 11' includes two groups of liquid inlet units 110a' and 110b' arranged along the first direction AA', and the liquid outlet area 120' includes two groups of liquid outlet units 120a' and 120b' arranged along the first direction AA', and the active area 130' is still located between the liquid inlet area 110' and the liquid outlet area 120'. At this time, the length of the active area 130" along the first direction AA' is equal to the total length of all the liquid inlet units 110a' and 110b' along the first direction AA'. The liquid inlet units 110a', 110b' and the liquid outlet units 120a' and 120b' can refer to the above-mentioned Figure 1 The description of the liquid inlet unit 110a and the liquid outlet unit 120a will not be repeated here.

[0044] Figure 4 is a front view of a bipolar plate of a liquid flow battery of the present application, Figure 5 This is a front view of an ion membrane of a flow battery of the present application. Figure 1 ,4 -5, the application also provides a liquid flow battery, including an ion membrane 12, a bipolar plate 13 and Figure 1 In the pole frame 11 of the illustrated embodiment, the ion membrane 12 has a plurality of first openings 121, and the bipolar plate 13 has a plurality of second openings 131. In the liquid flow battery, the number of the first openings 121 and the second openings 131 is 8, which is equal to the total number of the first liquid inlet holes 111, 112, the second liquid inlet holes 113, 114, the first liquid outlet holes 121, 122 and the second liquid outlet holes 123, 124 on the pole frame, and the positions of the first openings 121 and the second openings 131 also correspond to the positions of the first liquid inlet holes 111, 112, the second liquid inlet holes 113, 114, the first liquid outlet holes 121, 122 and the second liquid outlet holes 123, 124 on the pole frame 11.

[0045] In such Figure 1 In the specific embodiment shown, the size of the pole frame 11 is 622*210mm, the size of the active area 130 is 582*150mm, the size of the ion membrane 12 is 622*210mm, and the ion membrane material utilization rate is (582*150) / (622*210)=66.8%; the size of the bipolar plate 13 is 622*250mm, and the bipolar plate material utilization rate is (582*150) / (622*250)=56.1%. The relative area ratio of the active area 130, the ion membrane material utilization rate and the bipolar plate material utilization rate are all improved compared with the prior art.

[0046] It is understood that when the flow battery includes Figure 3 In the pole frame 11' shown, the ion membrane has 16 first openings and the bipolar plate has 16 second openings 131. As the number of liquid inlet units and liquid outlet units on the pole frame increases, the number of first openings and second openings also increases and is always a multiple of 8.

[0047] On the basis of the above-mentioned pole frame embodiments, further, the present application also provides a liquid flow battery and a liquid flow battery stack, wherein the liquid flow battery includes multiple pole frames as in the previous embodiment; and the liquid flow battery includes a liquid flow battery having a pole frame as in any of the previous embodiments.

[0048] The basic concepts have been described above. Obviously, for those skilled in the art, the above utility model disclosure is only used as an example and does not constitute a limitation of the present application. Although not explicitly stated here, those skilled in the art may make various modifications, improvements and corrections to the present application. Such modifications, improvements and corrections are suggested in the present application, so such modifications, improvements and corrections still belong to the spirit and scope of the exemplary embodiments of the present application.

[0049] At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0050] Similarly, it should be noted that in order to simplify the description of the disclosure of this application and thus help understand one or more utility model embodiments, in the above description of the embodiments of this application, multiple features are sometimes combined into one embodiment, drawing or description thereof. However, this disclosure method does not mean that the features required by the object of this application are more than the features mentioned in the claims. In fact, the features of the embodiments are less than all the features of the single embodiment disclosed above.

[0051] In some embodiments, numbers describing the number of components and attributes are used. It should be understood that such numbers used in the description of the embodiments are modified by the modifiers "about", "approximately" or "substantially" in some examples. Unless otherwise specified, "about", "approximately" or "substantially" indicate that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may change according to the required features of individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and adopt the general method of retaining digits. Although the numerical domains and parameters used to confirm the breadth of their range in some embodiments of the present application are approximate values, in specific embodiments, the setting of such numerical values ​​is as accurate as possible within the feasible range.

[0052] Although the present application has been described with reference to the current specific embodiments, ordinary technicians in this technical field should recognize that the above embodiments are only used to illustrate the present application, and various equivalent changes or substitutions may be made without departing from the spirit of the present application. Therefore, as long as the changes and modifications to the above embodiments are within the essential spirit of the present application, they will fall within the scope of the claims of the present application.

Claims

1. A pole frame suitable for a liquid flow battery, characterized in that: The pole frame includes a frame body and a liquid inlet area, an active area and a liquid outlet area located in the frame body, the frame body has a first side and a second side extending along a first direction on both sides of the active area, and the liquid inlet area includes at least one group of liquid inlet units, and the liquid outlet area includes at least one group of liquid outlet units, wherein, Each group of the liquid inlet units comprises at least two first liquid inlet holes located at a first position of the first side and at least two second liquid inlet holes located at a second position of the first side, and a liquid inlet main flow channel is formed between one of the at least two first liquid inlet holes and one of the at least two second liquid inlet holes; Each group of the liquid outlet units comprises at least two first liquid outlet holes located at a third position of the second side and at least two second liquid outlet holes located at a fourth position of the second side, and a liquid outlet main flow channel is formed between one of the at least two first liquid outlet holes and one of the at least two second liquid outlet holes; and The electrolyte in the flow battery is suitable for flowing into the active area from the liquid inlet main channel and flowing out from the liquid outlet main channel.

2. The pole frame according to claim 1, characterized in that The liquid inlet main channel includes a first liquid inlet main channel and a second liquid inlet main channel, and the liquid outlet main channel includes a first liquid outlet main channel and a second liquid outlet main channel; wherein, The electrolyte is suitable for flowing into the first liquid inlet main channel through the first liquid inlet hole, and flowing into the second liquid inlet main channel through the second liquid inlet hole; The electrolyte is suitable for flowing out from the first liquid outlet main channel through the first liquid outlet hole, and flowing out from the second liquid outlet main channel through the second liquid outlet hole.

3. The pole frame according to claim 2, characterized in that: The height of the first liquid inlet main channel in a second direction perpendicular to the first direction gradually increases from a position close to the first liquid inlet hole to a position far from the first liquid inlet hole, and the height of the second liquid inlet main channel in the second direction gradually increases from a position close to the second liquid inlet hole to a position far from the second liquid inlet hole; The height of the first liquid outlet main channel in the second direction gradually increases from a position close to the first liquid outlet hole to a position far away from the first liquid outlet hole, and the height of the second liquid outlet main channel in the second direction gradually increases from a position close to the second liquid outlet hole to a position far away from the second liquid outlet hole.

4. The pole frame according to claim 3, characterized in that: An end of the first liquid inlet main channel close to the first liquid inlet hole and an end of the second liquid inlet main channel close to the second liquid inlet hole have a first height in the second direction, an end of the first liquid inlet main channel away from the first liquid inlet hole and an end of the second liquid inlet main channel away from the second liquid inlet hole have a second height in the second direction, and a ratio P1 of the first height to the second height satisfies: 1.2≤P1≤3.

5. The pole frame according to claim 4, characterized in that An end of the first liquid outlet main channel close to the first liquid outlet hole and an end of the second liquid outlet main channel close to the second liquid outlet hole have a third height in the second direction, an end of the first liquid outlet main channel away from the first liquid outlet hole and an end of the second liquid outlet main channel away from the second liquid outlet hole have a fourth height in the second direction, and a ratio P2 of the third height to the fourth height satisfies: 1.2≤P2≤3.

6. The pole frame according to any one of claims 1 to 5, characterized in that: The length of the active area along the first direction is equal to the total length of all the liquid inlet units along the first direction, the height of the active area along a second direction perpendicular to the first direction is equal to the distance between the liquid inlet unit and the liquid outlet unit along the second direction; and the ratio a of the length of the active area along the first direction to the height of the active area along the second direction satisfies: a≥3.

7. The pole frame according to any one of claims 1 to 5, characterized in that: It also includes a plurality of guide slot units located near the liquid inlet main channel and the liquid outlet main channel, and each of the guide slot units includes a plurality of guide slots arranged along the first direction.

8. The pole frame according to claim 7, characterized in that: In the guide groove unit located below the liquid inlet main channel, the height of the guide groove in a second direction perpendicular to the first direction gradually increases from a position close to the first liquid inlet hole or the second liquid inlet hole to a position far away from the first liquid inlet hole or the second liquid inlet hole; In the guide groove unit located above the main liquid outlet channel, the height of the guide groove in the second direction gradually increases from a position close to the first liquid outlet hole or the second liquid outlet hole to a position far away from the first liquid outlet hole or the second liquid outlet hole.

9. The pole frame according to claim 8, characterized in that A width W of the guide groove along the first direction satisfies: 1mm≤W≤10mm, and a height H of the guide groove along the second direction satisfies: 1mm≤H≤10mm.

10. A liquid flow battery, characterized in that: The invention comprises an ion membrane, a bipolar plate and a polar frame as claimed in any one of claims 1 to 9, wherein the ion membrane has a plurality of first openings, the bipolar plate has a plurality of second openings, and in the flow battery: The plurality of first openings correspond to the total number and positions of the first liquid inlet hole, the second liquid inlet hole, the first liquid outlet hole, and the second liquid outlet hole; The plurality of second openings correspond to the total number and positions of the first liquid inlet hole, the second liquid inlet hole, the first liquid outlet hole, and the second liquid outlet hole.

11. A liquid flow battery stack, characterized in that: Comprising a plurality of the flow batteries as claimed in claim 10.

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