Gridding flow battery and applicable electric pile thereof
By dividing the active area of the flow battery into multiple small areas and designing multiple inlet and outlet tributaries, the problem of mass transfer of electrolyte in the flow battery stack is solved, and the stack performance and PCS DC are significantly improved. The degree of freedom of matching side voltages reduces system costs.
Patent Information
- Application Number
- CN202323561482.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-25
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2033-12-25
AI Technical Summary
The stack of the flow battery has increased the difficulty of mass transfer of electrolyte due to the large active area, resulting in concentration polarization, which limits the improvement of stack performance, and a lower voltage requires a larger charge and discharge current and a high-cost PCS. system.
Using the grid flow battery design, the traditional active area is divided into multiple small areas, and through the porous small electrodes and ion exchange membranes in the positive and negative electrode frame assembly, multiple inlet and outlet tributary channels are formed, which significantly reduces the The concentration difference polarization caused by uneven mass transfer is increased by the series battery, and the degree of freedom of matching the DC voltage of the PCS is increased.
It significantly improves the stack performance, reduces the concentration polarization phenomenon, and improves the matching freedom of the DC side voltage of the PCS, reducing system costs.
Smart Images
Figure CN222300687U_ABST
Abstract
Description
Technical Field
[0001] The present application mainly relates to the field of liquid flow batteries, and in particular to a grid liquid flow battery and a battery stack applicable thereto. Background Art
[0002] Liquid flow batteries have attracted widespread attention due to their rapid charge and discharge response, safe and reliable operation, long service life, deep charge and discharge capability, and independent design power and capacity. They have shown great application prospects in the fields of solar energy, wind energy storage, grid peak regulation, and power supply to remote areas.
[0003] Due to its principle and design, the active area of the flow battery stack is usually large. This feature makes the mass transfer of the electrolyte in the stack more difficult, and the resulting concentration polarization inhibits the improvement of the stack performance. At the same time, the larger active area requires a larger charge and discharge current during the operation of the flow battery, but its inherently low voltage requires the matching PCS (Power Conversion System, energy storage converter) to be customized, increasing the cost of the flow battery energy storage system.
[0004] At present, the mass transfer problem inside the battery stack is mainly solved by adding flow channels on the bipolar plates and increasing the flow rate, and multiple battery stacks are connected in series to meet the voltage requirements of the PCS DC side. However, this method still has some problems, such as the addition of bipolar plate flow channels increases the contact resistance between the bipolar plates and the electrodes, or multiple battery stacks connected in series increase the system leakage loss, increasing the risk of system operation. Utility Model Content
[0005] The technical problem to be solved by the present application is to provide a grid-type liquid flow battery and a battery stack suitable therefor, which can significantly reduce the concentration polarization phenomenon caused by uneven mass transfer, and at the same time improve the performance of the battery stack, significantly improve the matching freedom of the PCS DC side voltage.
[0006] In order to solve the above technical problems, the present application provides a grid liquid flow battery, comprising: a positive electrode frame assembly, comprising a positive electrode frame and two or more positive electrode active areas located in the positive electrode frame; a negative electrode frame assembly, comprising a negative electrode frame and two or more negative electrode active areas located in the negative electrode frame; two or more positive porous small electrodes located in the positive electrode active areas; two or more negative porous small electrodes located in the negative electrode active areas; and an ion exchange membrane, which is located between the positive porous small electrode and the negative porous small electrode in the liquid flow battery, wherein the positive electrode frame assembly and the negative electrode frame assembly also respectively include a positive electrode. A main liquid inlet flow channel, a positive electrode liquid outlet main flow channel, a negative electrode liquid inlet main flow channel and a negative electrode liquid outlet main flow channel, and a plurality of grooves near each of the positive electrode active area and the negative electrode active area; the plurality of grooves form a plurality of positive electrode liquid inlet branch flow channels, a plurality of positive electrode liquid outlet branch flow channels, a plurality of negative electrode liquid inlet branch flow channels and a plurality of negative electrode liquid outlet branch flow channels in the positive electrode active area and the negative electrode active area; and the plurality of positive electrode liquid inlet branch flow channels and the plurality of negative electrode liquid inlet branch flow channels are respectively connected to the positive electrode liquid inlet main flow channel and the negative electrode liquid inlet main flow channel, and the plurality of positive electrode liquid outlet branch flow channels and the plurality of negative electrode liquid outlet branch flow channels are respectively connected to the positive electrode liquid outlet main flow channel and the negative electrode liquid outlet main flow channel.
[0007] Optionally, the ion exchange membrane includes a sheet of ion exchange membrane having the same size as the positive electrode frame and the negative electrode frame, or a plurality of ion exchange membranes respectively covering each of the positive electrode active regions or each of the negative electrode active regions.
[0008] Optionally, it also includes a first bipolar plate and a second bipolar plate, which are respectively located on the side of the positive electrode frame assembly and the negative electrode frame assembly away from the ion exchange membrane, wherein the sizes of the first bipolar plate and the second bipolar plate are the same as the sizes of the positive electrode frame and the negative electrode frame, respectively.
[0009] Optionally, the first bipolar plate and the second bipolar plate include carbon plates, and both the first bipolar plate and the second bipolar plate are provided with positive electrode common flow channel holes and negative electrode common flow channel holes.
[0010] Optionally, it further comprises a current collecting plate, a liquid inlet plate and an end plate, which are respectively and sequentially located on a side of the first bipolar plate and the second bipolar plate away from the ion exchange membrane.
[0011] Optionally, the positive electrode frame and the negative electrode frame are provided with a positive electrode liquid inlet hole, a negative electrode liquid inlet hole, a positive electrode liquid outlet hole, and a negative electrode liquid outlet hole, wherein the positive electrode liquid inlet hole and the negative electrode liquid inlet hole are respectively connected to the positive electrode liquid inlet main flow channel and the negative electrode liquid inlet main flow channel, and the positive electrode liquid outlet hole and the negative electrode liquid outlet hole are respectively connected to the positive electrode liquid outlet main flow channel and the negative electrode liquid outlet main flow channel.
[0012] Optionally, the positive electrode frame assembly and the negative electrode frame assembly further include a positive electrode frame cover plate and a negative electrode frame cover plate, which are respectively buckled on a side of the positive electrode frame and the negative electrode frame in the liquid flow battery away from the ion exchange membrane.
[0013] Another aspect of the present application provides a gridded liquid flow battery stack, comprising two or more gridded liquid flow batteries as described above connected in series.
[0014] Compared with the prior art, the present invention divides the traditional active area into multiple small active areas by gridding, which greatly reduces the concentration polarization caused by uneven mass transfer due to the enlarged active area, and significantly improves the performance of the battery stack; at the same time, after the traditional battery grid is divided into n battery polarity areas, each small battery is independent and connected in series. When the voltage of a small battery is V 0 (usually 1.25V), the voltage of a flow battery is increased to n*V 0 , the voltage of the m-cell flow battery stack is increased to m*n*V 0 The matching freedom of the PCS DC side voltage is significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] 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:
[0016] Figure 1 This is a schematic diagram of an exploded structure of a grid-type liquid flow battery according to an embodiment of the present application;
[0017] Figure 2 This is a schematic diagram of the electrolyte flow direction of the positive electrode frame and the negative electrode frame in a grid-type liquid flow battery according to an embodiment of the present application. DETAILED DESCRIPTION
[0018] 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.
[0019] 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.
[0020] 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.
[0021] 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.
[0022] 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.
[0023] 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.
[0024] This application refers to Figure 1-2 A grid-type liquid flow battery 10 is proposed, wherein: Figure 1 Schematic diagram of the exploded structure of the grid-type liquid flow battery 10 , in which the grid-type liquid flow battery 10 has a positive electrode frame assembly 201 and a negative electrode frame assembly 202 . Figure 2 The positive electrode frame assembly 201 in the grid-type liquid flow battery 10 is as follows Figure 1 The schematic diagram of the electrolyte flow in the positive electrode frame assembly 201 observed from the perspective of direction A shown in FIG. Figure 1 The schematic diagram of electrolyte flow observed from the direction B is shown. The positive electrode frame 201 mainly includes a positive electrode frame 2010 and a positive active area 2011 located therein, while the negative electrode frame 202 mainly includes a positive electrode frame 2020 and a positive active area 2021 located therein.
[0025] It should be noted that since the positive electrode frame assembly 201 and the negative electrode frame assembly 202 have the same internal structure, but only have different positions and mutually symmetrical placement in the grid-type liquid flow battery 10, Figure 2The schematic diagram of the electrolyte flow direction in the electrode frame assembly 20 is shown, wherein the same structure is Figure 2 Use different labels in Figure 2 The shown can also be considered as a reference Figure 1 The schematic diagram of the structure of the positive electrode frame assembly 201 observed from the A direction, or the schematic diagram of the structure of the negative electrode frame assembly 202 observed from the B direction.
[0026] In this embodiment, the electrode frame assembly includes multiple electrode active areas, specifically, these electrode active areas specifically include four positive electrode active areas 2011 in the positive electrode frame assembly 201, and four negative electrode active areas 2021 located in the negative electrode frame assembly 202. In other embodiments of the present application, the positive electrode frame assembly 201 and the negative electrode frame assembly 202 may include two or more positive electrode active areas 2011 and two or more negative electrode active areas 2021, and this application does not Figure 1 and Figure 2 The four shown are limitations. Exemplarily, the positive electrode frame 201 and the negative electrode frame 202 may be square plates; and in this embodiment, preferably, the positive active region 2011 and the negative active region 2021 are rectangular regions that can match the square plates in appearance and size.
[0027] For more details, see Figure 1 and Figure 2 , each positive electrode active area 2011 is suitable for placing a positive electrode porous small electrode 2012, each negative electrode active area 2021 is suitable for placing a negative electrode porous small electrode 2022, and an ion exchange membrane 203 is located between the two. In this embodiment, the ion exchange membrane 203 is specifically implemented as a perfluorosulfonic acid membrane with the same size as the positive electrode frame 201 and the negative electrode frame 202. However, the present application is not limited to this. In other embodiments of the present application, the ion exchange membrane 203 can also be further modified and implemented as multiple perfluorosulfonic acid membranes covering each positive electrode active area 2011 or each negative electrode active area 2021 respectively.
[0028] In the positive electrode frame assembly 201 of the present embodiment, it also includes a positive electrode liquid inlet main flow channel L1 and a positive electrode liquid outlet main flow channel L2; on this basis, the positive electrode frame assembly 201 also includes a plurality of grooves 2015 near each positive electrode active area 2011. Specifically, for the positive electrode frame assembly 201, a plurality of grooves 2015 are provided near each positive electrode active area 2011, and the plurality of grooves 2015 form a plurality of positive electrode liquid inlet branch flow channels L11 and a plurality of positive electrode liquid outlet branch flow channels L22 of the plurality of positive electrode active areas 2011. The plurality of positive electrode liquid inlet branch flow channels L11 are connected to the positive electrode liquid inlet main flow channel L1, and the plurality of positive electrode liquid outlet branch flow channels L22 are connected to the positive electrode liquid outlet main flow channel L2.
[0029] Similarly, for the negative electrode frame assembly 202, it also includes a negative electrode liquid inlet main flow channel L3 and a negative electrode liquid outlet main flow channel L4; on this basis, the negative electrode frame assembly 202 also includes a plurality of grooves 2025 near each negative electrode active area 2021. Specifically, for the negative electrode frame assembly 202, there are a plurality of grooves 2025 near each negative electrode active area 2021, and the plurality of grooves 2025 form a plurality of negative electrode liquid inlet branch flow channels L31 and a plurality of negative electrode liquid outlet branch flow channels L42 of a plurality of negative electrode active areas 2021. The plurality of negative electrode liquid inlet branch flow channels L31 are connected to the negative electrode liquid inlet main flow channel L3, and the plurality of negative electrode liquid outlet branch flow channels L42 are connected to the negative electrode liquid outlet main flow channel L4.
[0030] Furthermore, the positive electrode frame 2010 and the negative electrode frame 2020 are provided with a positive electrode liquid inlet hole 2013, a positive electrode liquid outlet hole 2014, a negative electrode liquid inlet hole 2023 and a negative electrode liquid outlet hole 2024, wherein the positive electrode liquid inlet hole 2013 and the negative electrode liquid inlet hole 2023 are respectively connected to the positive electrode liquid inlet main flow channel L1 and the negative electrode liquid inlet main flow channel L3, and the positive electrode liquid outlet hole 2014 and the negative electrode liquid outlet hole 2024 are respectively connected to the positive electrode liquid outlet main flow channel L2 and the negative electrode liquid outlet main flow channel L4. In actual application, the positive and negative electrolytes enter the positive electrode inlet main flow channel L1 and the negative electrode inlet main flow channel L3 through the positive electrode inlet hole 2013 and the negative electrode inlet hole 2023 respectively, and then are distributed to each positive electrode inlet branch flow channel L11 and each negative electrode inlet branch flow channel L31 and flow into the positive electrode porous small electrode 2012 and the negative electrode porous small electrode 2022. On this basis, the positive and negative electrolytes pass through the positive electrode outlet branch flow channel L22 and the negative electrode outlet branch flow channel L42 respectively and merge into the positive electrode outlet main flow channel L2 and the negative electrode outlet main flow channel L4, and then flow out through the corresponding positive electrode outlet hole 2014 and the negative electrode outlet hole 2024.
[0031] On the other hand, refer to Figure 1 , the gridded liquid flow battery 10 also includes a first bipolar plate 101 and a second bipolar plate 102, which are respectively located on the side of the positive electrode frame 201 and the negative electrode frame 202 away from the ion exchange membrane 203. In the present embodiment, the sizes of the first bipolar plate 101 and the second bipolar plate 102 are respectively the same as the sizes of the positive electrode frame 201 and the negative electrode frame 202. In the present embodiment, preferably, the first bipolar plate 101 and the second bipolar plate 102 include carbon plates, preferably composite carbon plates having components such as graphite, PP or PVDF. In the present embodiment, a plurality of positive common flow channel holes 1011 and a plurality of negative common flow channel holes 1021 are provided on the first bipolar plate 101 and the second bipolar plate 102. Specifically, refer to Figure 2These positive electrode common flow channel holes 1011 and negative electrode common flow channel holes 1021 can correspond to the positions of the positive electrode liquid inlet hole 2013, the positive electrode liquid outlet hole 2014, the negative electrode liquid inlet hole 2023, and the negative electrode liquid outlet hole 2024 on the positive electrode frame 201 in the grid liquid flow battery 10.
[0032] For example, when the first bipolar plate 101 cooperates with the positive electrode frame 201 and the ion exchange membrane 203 to seal, a closed-loop seal needs to be performed on the outside of each positive active area 2011, and sealing can be performed by bonding, welding, rubber sealing, etc. The second bipolar plate 102 can also be sealed with the negative electrode frame 202 and the ion exchange membrane 203 in the same manner.
[0033] Further references Figure 1 The grid-type liquid flow battery 10 further includes a current collecting plate 1031, a liquid inlet plate 1041 and an end plate 1051, which are respectively located on the side of the first bipolar plate 101 away from the ion exchange membrane 203. In addition, the grid-type liquid flow battery 10 further includes a current collecting plate 1032, a liquid inlet plate 1042 and an end plate 1052, which are respectively located on the side of the second bipolar plate 102 away from the ion exchange membrane 203.
[0034] Furthermore, the positive electrode frame assembly 201 further includes a positive electrode frame cover plate 2016, and the negative electrode frame assembly 202 further includes a negative electrode frame cover plate 2026, which are respectively buckled on the positive electrode frame 2010 and the negative electrode frame 2020 on the side away from the ion exchange membrane 203 in the liquid flow battery 10. By buckling the positive electrode frame cover plate 2016 and the negative electrode frame cover plate 2026, it can be ensured that the electrolyte is as follows: Figure 2 The designed positive electrode liquid inlet main flow channel L1, positive electrode liquid inlet branch flow channel L11, positive electrode liquid outlet main flow channel L2, positive electrode liquid outlet branch flow channel L22, negative electrode liquid inlet main flow channel L3, negative electrode liquid inlet branch flow channel L31, negative electrode liquid outlet main flow channel L4 and negative electrode liquid outlet branch flow channel L42 flow through.
[0035] The present application also provides a grid-type liquid flow battery stack, comprising two or more grid-type liquid flow batteries of any embodiment of the present application connected in series, such as the above-mentioned reference Figure 1 and Figure 2 A gridded flow battery 10 is illustrated.
[0036] In order to better understand the effect of the grid-based liquid flow battery 10, a common liquid flow battery is introduced as a comparative example to compare the voltage efficiency and energy efficiency with the grid-based liquid flow battery 10. In the comparative example, the common liquid flow battery has an electrode thickness of 4.35 mm and an active area of 1280 cm 2 , the electrode compression rate is 25%, assembled into a 20-cell stack, at 110mA / cm 2The current density is used for constant current charge and discharge, and the data of the third cycle is selected as the reliable performance data. The grid-type liquid flow battery 10 has 4 positive active areas and 4 negative active areas, and the area of each active area is 340 cm 2 , electrode thickness 4.35mm, electrode compression rate 25%, assembled into 20-cell stack, at 110mA / cm 2 The constant current charge and discharge are performed at a current density of , and the data of the third cycle are selected as the reliable performance data. The key materials used in the grid flow battery 10 and the ordinary flow battery in the comparative example are all products of the same batch, and are tested at the same ambient temperature.
[0037] The following table shows the test data of the gridded liquid flow battery 10 and the ordinary liquid flow battery in the comparative example.
[0038] Voltage efficiency (%) Energy efficiency (%) Grid flow battery 10 88.7％ 86.1％ Comparative Example 86.5％ 84.2％
[0039] From the comparison of the test data of the embodiment of the gridded liquid flow battery 10 and the comparative example, it can be seen that the gridded liquid flow battery 10 proposed in the present application has a significant improvement in the performance of the battery stack. At the same time, the PCS DC side voltage of the embodiment is increased to 4*20*1.25=100V, and that of the comparative example is 20*1.25=25V.
[0040] The basic concepts have been described above. Obviously, for those skilled in the art, the above application disclosure is only an example and does not constitute a limitation of the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements and amendments to the present application. Such modifications, improvements and amendments are suggested in the present application, so such modifications, improvements and amendments still belong to the spirit and scope of the exemplary embodiments of the present application.
[0041] 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.
[0042] 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 application embodiments, in the above description of the embodiments of this application, multiple features are sometimes merged into one embodiment, figure 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.
[0043] 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.
[0044] 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 grid-type liquid flow battery, characterized in that: include: A positive electrode frame assembly, comprising a positive electrode frame and two or more positive electrode active areas located in the positive electrode frame; A negative electrode frame assembly, comprising a negative electrode frame and two or more negative electrode active areas located in the negative electrode frame; Two or more positive porous small electrodes located in the positive electrode active area; Two or more small negative porous electrodes located in the negative electrode active area; and The ion exchange membrane is located between the positive porous small electrode and the negative porous small electrode in the liquid flow battery, wherein: The positive electrode frame assembly and the negative electrode frame assembly further include a positive electrode liquid inlet main flow channel, a positive electrode liquid outlet main flow channel, a negative electrode liquid inlet main flow channel and a negative electrode liquid outlet main flow channel, and a plurality of grooves near each of the positive electrode active area and the negative electrode active area; The plurality of grooves form a plurality of positive electrode liquid inlet branch channels, a plurality of positive electrode liquid outlet branch channels, a plurality of negative electrode liquid inlet branch channels and a plurality of negative electrode liquid outlet branch channels in the positive electrode active area and the negative electrode active area; and The multiple positive electrode liquid inlet branch channels and the multiple negative electrode liquid inlet branch channels are respectively connected to the positive electrode liquid inlet main channel and the negative electrode liquid inlet main channel, and the multiple positive electrode liquid outlet branch channels and the multiple negative electrode liquid outlet branch channels are respectively connected to the positive electrode liquid outlet main channel and the negative electrode liquid outlet main channel.
2. The flow battery according to claim 1, characterized in that The ion exchange membrane includes a single ion exchange membrane having the same size as the positive electrode frame and the negative electrode frame, or a plurality of ion exchange membranes respectively covering each of the positive electrode active regions or each of the negative electrode active regions.
3. The flow battery according to claim 1, wherein: It also includes a first bipolar plate and a second bipolar plate, which are respectively located on the side of the positive electrode frame assembly and the negative electrode frame assembly away from the ion exchange membrane, wherein the sizes of the first bipolar plate and the second bipolar plate are the same as the sizes of the positive electrode frame and the negative electrode frame, respectively.
4. The flow battery according to claim 3, characterized in that: The first bipolar plate and the second bipolar plate include carbon plates, and both the first bipolar plate and the second bipolar plate are provided with positive electrode common flow channel holes and negative electrode common flow channel holes.
5. The flow battery according to claim 3, characterized in that: It also includes a current collecting plate, a liquid inlet plate and an end plate, which are respectively and sequentially located on the side of the first bipolar plate and the second bipolar plate away from the ion exchange membrane.
6. The flow battery according to claim 1, wherein: The positive electrode frame and the negative electrode frame are both provided with a positive electrode liquid inlet hole, a negative electrode liquid inlet hole, a positive electrode liquid outlet hole, and a negative electrode liquid outlet hole, wherein the positive electrode liquid inlet hole and the negative electrode liquid inlet hole are respectively connected to the positive electrode liquid inlet main flow channel and the negative electrode liquid inlet main flow channel, and the positive electrode liquid outlet hole and the negative electrode liquid outlet hole are respectively connected to the positive electrode liquid outlet main flow channel and the negative electrode liquid outlet main flow channel.
7. The flow battery according to claim 1, wherein: The positive electrode frame assembly and the negative electrode frame assembly further include a positive electrode frame cover plate and a negative electrode frame cover plate, which are respectively buckled on the positive electrode frame and the negative electrode frame at a side away from the ion exchange membrane in the liquid flow battery.
8. A grid-type liquid flow battery stack, characterized in that: include: Two or more gridded liquid flow batteries as claimed in any one of claims 1 to 7 connected in series.