Flow channel bipolar plate with positive and negative staggered rib wave reinforcement for flow battery
Patent Information
- Application Number
- CN202611037645.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-07-13
- Publication Date
- 2026-08-28
AI Technical Summary
[0004]根据上述提出现有对称平行流道结构导致弯曲载荷集中于流道区域，局部应力显著提升；直线型流道缺乏结构强化作用，甚至因流道降低双极板整体抗弯强度的技术问题，而提供一种正反交错肋部波折强化的液流电池流道双极板
1、本发明通过正反交错式流道截面设计，将传统结构中仅由流道底部承担的弯曲载荷，转变为由整个流道与肋部共同承担，避免了应力集中于流道薄弱区域。同时，波折流道的水平波动设计进一步增强了流场主干区域的抗弯截面模量，使双极板在承受弯曲载荷时具有更高的结构刚性和抗断裂能力。
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Figure CN122659178A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of bipolar plate technology, and more specifically to a flow battery bipolar plate with reinforced flow channel by alternating positive and negative ribs. Background Technology
[0002] Flow batteries, as a large-scale, long-term energy storage technology, have significant application value in the field of renewable energy grid connection due to their advantages such as independently designable power and capacity, long cycle life, and high intrinsic safety. Among them, the bipolar plate, as the core component of the flow battery, undertakes multiple functions including conducting current, isolating the electrolyte, and supporting the battery structure. To optimize electrolyte distribution and improve battery performance, bipolar plates are typically designed with flow field structures, such as parallel flow fields, serpentine flow fields, or interdigitated flow fields. However, the introduction of flow field structures can alter the mechanical properties of the bipolar plate, especially the stress distribution in the flow channel region, thus affecting its bending strength. In symmetrical flow field designs, the bending stress concentration phenomenon in the flow channel region is particularly significant, which may increase the risk of plate bending, thereby affecting the long-term service reliability of the stack.
[0003] Currently, the flow field design of bipolar plates in flow batteries mostly adopts a symmetrical parallel DC channel structure. While this design can achieve uniform electrolyte distribution, the geometric symmetry of the flow channel region causes bending loads to concentrate at the top or bottom of the channel, leading to a significant increase in local stress. Furthermore, the main flow field region of traditional flow fields is usually a straight channel, lacking structural reinforcement for the bending resistance of the plate, and may even further reduce the overall strength of the bipolar plate. Although existing technologies can alleviate this problem by adjusting the channel size or material selection, the negative impact of the flow field structure itself on mechanical properties remains unresolved. Therefore, there is an urgent need for a flow field design method that can balance electrolyte flow efficiency and mechanical properties to improve the bending resistance of bipolar plates and reduce the risk of bending. Summary of the Invention
[0004] Based on the aforementioned issues, existing symmetrical parallel flow channel structures result in concentrated bending loads in the flow channel region, significantly increasing local stress. Straight flow channels lack structural reinforcement and can even reduce the overall bending strength of the bipolar plate. Therefore, this invention provides a flow battery bipolar plate with reinforced flow channels featuring alternating ribs. This invention primarily utilizes alternating flow channels and rib structures on the upper and lower surfaces of the bipolar plate, where the upper surface flow channels correspond to the lower surface ribs, and vice versa, forming an alternating load-bearing structure with uniform cross-sectional thickness. Simultaneously, corrugated flow channels with periodic or aperiodic horizontal fluctuations are set in the main flow field region to geometrically reinforce the flow channel direction. This disperses the bending load from isolated flow channel regions to be borne by the entire flow channel and ribs, significantly improving the bending strength and structural stability of the bipolar plate. The corrugated flow channels guide microscopic disturbances in the electrolyte, improving the uniformity of reactant distribution and increasing the utilization rate of active materials. The chamfering and demolding angles improve molding processability and reduce manufacturing costs.
[0005] The technical means employed in this invention are as follows: A flow field structure for a flow battery bipolar plate with reinforced corrugated ribs includes a bipolar plate substrate, flow channel units, and rib units. The bipolar plate substrate includes a first surface and a second surface. The first surface is provided with a first flow channel unit and a first rib unit, and the second surface is provided with a second flow channel unit and a second rib unit. The first flow channel unit and the second rib unit are opposite to each other in the vertical direction of the bipolar plate substrate, and the second flow channel unit and the first rib unit are opposite to each other in the vertical direction of the bipolar plate substrate. The flow channel unit is a corrugated flow channel, with a chamfer between the first rib unit and the first flow channel unit, and a chamfer between the second rib unit and the second flow channel unit.
[0006] Furthermore, the width ratio of the first flow channel unit to the first rib unit is 1:20 to 1:1, the width ratio of the second flow channel unit to the second rib unit is 1:20 to 1:1, and the thickness of the bipolar plate flow field structure is less than or equal to 10 mm.
[0007] Furthermore, the depth of the flow channel unit is 0.1 mm to 3 mm, and the width of the flow channel unit is 0.5 mm to 20 mm.
[0008] Furthermore, the chamfer radius is 0.1 mm to 3 mm.
[0009] Furthermore, it also includes an electrolyte inlet and an electrolyte outlet, which are respectively located above and below the flow channel unit. The liquid output end of the electrolyte inlet is connected to the liquid input end of the flow channel unit, and the liquid output end of the flow channel unit is connected to the input end of the electrolyte outlet.
[0010] Furthermore, the wave pattern of the corrugated flow channel is a horizontal broken line wave, a horizontal curve wave, or a combination thereof. In one corrugated flow channel, the wave amplitude is 1 mm to 30 mm, and the number of waves is 2 to 20.
[0011] Furthermore, the flow channel unit is a flow field structure with a parallel array backbone region, and the flow field structure includes, but is not limited to, one or more combinations of parallel flow field, serpentine flow field, interdigitated flow field, multi-serpentine flow field or spiral serpentine flow field.
[0012] Furthermore, the inner wall of the flow channel unit is provided with a demolding angle, which is 60°~90°.
[0013] Furthermore, it also includes electrolyte conduction lines for transporting electrolyte between different individual cells.
[0014] Compared with the prior art, the present invention has the following advantages: 1. This invention, through a staggered flow channel cross-section design, transforms the bending load, which is borne solely by the bottom of the flow channel in traditional structures, into a load shared by the entire flow channel and the ribs, thus avoiding stress concentration in weak areas of the flow channel. Simultaneously, the horizontal undulation design of the corrugated flow channel further enhances the bending section modulus of the main flow field region, giving the bipolar plate higher structural rigidity and fracture resistance when subjected to bending loads.
[0015] 2. The alternating forward and reverse structure of this invention makes the thickness distribution of the bipolar plate cross-section more uniform, avoiding the problem of increased local resistance caused by excessive thickness differences between the flow channel and the ribs in traditional symmetrical flow fields. The thickness uniformity design effectively reduces the overall ohmic polarization of the bipolar plate and improves the uniformity of current conduction in the plate surface and thickness direction, thereby improving the voltage efficiency and energy efficiency of the flow battery.
[0016] 3. The periodic or non-periodic oscillations of the corrugated flow channel of the present invention in the horizontal direction can guide the electrolyte to generate microscopic disturbances in the flow field, enhance the convection and diffusion effect of the fluid on the electrode surface, reduce dead zones and short-circuit flow, promote the uniform distribution of reactants in the active area, and thus improve the utilization rate of active materials and the battery power density. 4. The present invention features a chamfered structure at the edge of the runner, which effectively avoids stress concentration during the molding process and reduces the risk of cracking of the bipolar plate during demolding or use. At the same time, the demolding angle designed on the inner wall of the runner makes the mold demolding smoother, reduces the molding defect rate, and is suitable for large-scale production processes such as compression molding and injection molding, with good engineering feasibility.
[0017] Based on the above reasons, this invention can be widely applied in fields such as bipolar plates. Attached Figure Description
[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0019] Figure 1 This is a schematic diagram of the bipolar plate of the flow battery channel reinforced by the alternating ribs of the present invention.
[0020] Figure 2 This is a cross-sectional schematic diagram of the bipolar plate with alternating positive and negative ribs in the flow channel of the present invention, which has no chamfer and no demolding angle.
[0021] Figure 3 A cross-sectional schematic diagram of the bipolar plate with alternating positive and negative ribs for adding chamfers and demolding angles to the flow channel of this invention.
[0022] Figure 4 This is a partial cross-sectional schematic diagram of the bipolar plate of the flow battery channel reinforced by the alternating ribs proposed in this invention.
[0023] Figure 5 This is a partial cross-sectional schematic diagram of the bipolar plate of the flow battery with corrugated reinforcement of the flow channel by alternating positive and negative ribs, where the flow channel thickness is less than the flow channel depth, as proposed in this invention.
[0024] Figure 6 This is a partial cross-sectional schematic diagram of the bipolar plate of the flow battery with corrugated reinforcement of the flow channel by alternating positive and negative ribs, which has a flow channel thickness greater than the flow channel depth, as proposed in this invention.
[0025] Figure 7 The diagram shows a cross-sectional view of the bipolar plate of the flow battery with reinforced corrugated ribs proposed in this invention (Structure 1), a cross-sectional view of a conventional bipolar plate without flow channels (Structure 2), and a cross-sectional view of a conventional bipolar plate of the flow battery without corrugated ribs (Structure 3).
[0026] Figure 8 This is a schematic diagram of the tortuous design of a portion of the flow channel in the main region of the flow field, taking the interdigitated flow field as an example.
[0027] Figure 9 A schematic diagram of the design of the main region of the cross-finger flow field for application of the present invention.
[0028] Figure 10 This is a side view of a traditional bipolar plate flow field.
[0029] Figure 11 This represents the main flow field region, using a traditional flow field as an example.
[0030] In the diagram: 1. Electrolyte inlet; 2. Electrolyte outlet; 3. Rib unit; 31. First rib unit; 32. Second rib unit; 4. Flow channel unit; 41. First flow channel unit; 42. Second flow channel unit; 5. Electrolyte conduction pipeline; 6. Chamfer. Detailed Implementation
[0031] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.
[0032] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.
[0033] Figure 10 The symmetrical design of traditional flow channel bipolar plates concentrates larger bending loads in the flow channel area, thus increasing the risk of plate bending. For example... Figure 11 Parallel flow fields, serpentine flow fields, and interdigitated flow fields are common flow fields in flow batteries, but the main flow field region consists of mutually parallel arrayed DC channels. If these channels are... Figure 10The cross-sectional design shown will further weaken the bending strength of the bipolar plate flow channel in the symmetrical flow field. Therefore, how to design the bipolar plate flow channel and strengthen the plate strength by means of the flow channel and flow field structure, so that the flow field changes from a negative structure that increases the risk of bending to an improved structure that enhances bending performance.
[0034] like Figure 1 As shown, this invention provides a flow battery bipolar plate with reinforced flow channels by alternating ribs, comprising a bipolar plate substrate, flow channel units 4, and rib units 3. This invention proposes to optimize the structure of the parallel array flow channels in the main region of the flow field by introducing alternating flow channels on both sides of the bipolar plate and further increasing the bending undulations of each of the alternating flow channels, thus forming a dual-structure reinforcement.
[0035] like Figure 2 As shown, the bipolar plate substrate includes a first surface and a second surface. The first surface is provided with a first flow channel unit 41 and a first rib unit 31, and the second surface is provided with a second flow channel unit 42 and a second rib unit 32. The first flow channel unit 41 and the second rib unit 32 are opposite to each other in the vertical direction of the bipolar plate substrate, and the second flow channel unit 42 and the first rib unit 31 are opposite to each other in the vertical direction of the bipolar plate substrate.
[0036] Specifically, the flow channel structure is designed with a staggered cross-section, meaning the flow channel on the front side is designed as the rib on the back side, and vice versa. This creates a staggered flow channel structure in the cross-section. In this case, the flow channel is no longer the sole point of contact bearing the bending load on the bipolar plate; the load is now shared by the entire flow channel and the ribs. Furthermore, the bipolar plate cross-section shows a more uniform thickness, significantly improving the conductivity of the flow field bipolar plate.
[0037] Furthermore, the width ratio of the first flow channel unit 41 to the first rib unit 31 is 1:20 to 1:1, the width ratio of the second flow channel unit 42 to the second rib unit 32 is 1:20 to 1:1, and the thickness of the bipolar plate flow field structure is less than or equal to 10 mm.
[0038] Specifically, the flow channels and ribs can have the same width, but the advantages of this staggered design cannot be fully realized. Alternatively, a staggered flow channel with a width smaller than the rib width can be designed, which will significantly improve the overall strength of the staggered structure.
[0039] The flow channel unit 4 is a corrugated flow channel. A chamfer 6 is provided between the first rib unit 31 and the first flow channel unit 41, and a chamfer 6 is provided between the second rib unit 32 and the second flow channel unit 42. The corners of the rib units are also provided with a chamfer 6.
[0040] Furthermore, the depth of the flow channel unit 4 is 0.1 mm to 3 mm, and the width of the flow channel unit 4 is 0.5 mm to 20 mm.
[0041] Furthermore, the wave pattern of the zigzag channel is a horizontal broken line wave, a horizontal curved wave, or a combination thereof. In a single zigzag channel, the wave amplitude is 1 mm to 30 mm, and the number of waves is 2 to 20. Channel unit 4 is one or more combinations of various flow fields with parallel characteristics in the main region, such as parallel flow field, serpentine flow field, interdigitated flow field, multi-serpentine flow field, or spiral serpentine flow field.
[0042] like Figure 3 As shown, in addition to increasing the width difference between the ribs and the flow channels to further enhance the strength of the staggered flow channel design, the chamfer 6 and demolding angle of the cross-section can also be increased to form higher bending strength and improve the formability of the structure proposed in this patent. The chamfer 6 and demolding angle can effectively assist in molding to a certain extent, preventing stress concentration under load, and making demolding easier and achieving a good demolding effect. At the same time, the chamfer 6 avoids stress concentration during the service load of the bipolar plate to a certain extent. By increasing the chamfer 6 on the upper and lower edges of the flow channel and the demolding angle of the flow channel, the flow channel will be easier to form and demold. A continuous staggered structure will be formed throughout the flow channel cross-section, increasing the cross-section's ability to resist bending loads. The inner wall of the flow channel unit 4 is provided with a demolding angle, which is 60°~90°. The radius of the chamfer 6 is 0.1 mm~3 mm.
[0043] exist Figure 4 In this paper, the cross-section of the flow battery bipolar plate with alternating ribs and corrugations reinforced by the present patent can be locally analyzed. In the analysis, the flow channel thickness is defined as t1, the flow channel depth as h1, the thickness of the inclined sidewall between the flow channel and the rib is t2, the inclination angle of the inclined sidewall is also the demolding angle θ, the chamfer of the upper edge of the rib is R2, the chamfer of the lower edge is R1, and the overall thickness of the bipolar plate with alternating ribs and corrugations reinforced by the present patent is H.
[0044] Figure 5 and Figure 6 It can be stated that the cross-section of the bipolar plate proposed in this patent can be varied to a certain extent. In addition to the variation of a single parameter, there is also the relative relationship between the channel thickness t1 and the channel depth h1. t1 can be relatively thin or relatively thick. Since this patent improves the overall bending strength of the bipolar plate to a certain extent, t1 can be reduced, resulting in a decrease in the total thickness H of this patent, thereby reducing the overall volume resistance of the bipolar plate.
[0045] Figure 7The diagram shows cross-sectional views of three different flow channel bipolar plates. Structure 1 is the cross-section of the flow channel bipolar plate with alternating ribs and corrugated reinforcement proposed in this patent; Structure 2 is the cross-section of a traditional flow channel bipolar plate without alternating ribs; and Structure 3 is the cross-section of a symmetrical traditional flow channel bipolar plate without alternating ribs. Figure 4 , Figure 5 and Figure 6 The structural parameters can be roughly used to determine the... Figure 7 The theoretical calculation of bending strength was performed on three different structures.
[0046] Structure 1, based on And simplifies to the maximum extent due to symmetry, total height H, plate thickness t1 at the flow channel, sidewall inclination angle θ, sidewall thickness t2, and period length. l If R1 and R2 are ignored, the cross section is symmetrical about the centerline; Moment of inertia per cycle I 1 The simplified approximate formula is:
[0047] Section modulus:
[0048] Structure 2, Baseline Model:
[0049] Structure 3, Section Modulus Estimation:
[0050]
[0051] Therefore, it can be seen that W1 > W3 > W2.
[0052] In structure 2, the structural strength of a conventional bipolar plate depends entirely on the plate thickness. To increase the section modulus of the material, the plate needs to be thickened. In structure 3, although the section modulus of the traditional flow channel bipolar plate is ideally higher than that of structure 2, and the strength of the plate is related to both the flow channel depth and the thickness at the flow channel, the plate is prone to fracture at the flow channel, thus the strength of the traditional flow channel bipolar plate is still relatively weak. In structure 1, which is the structure proposed in this patent, by reducing H and utilizing the alternating positive and negative rib structure, the undulations of the flow channel and ribs are reduced, forming an overall bipolar plate that is more concentrated towards the center line of the plate, resulting in a more stable center of gravity structure.
[0053] To further increase the bending strength of the bipolar plate in the flow field, a horizontal corrugated structure can be added to the main region of the flow field, in conjunction with the aforementioned staggered cross-section flow channel. For the corrugation design of the main flow channel, the corrugation form can include various horizontal undulating structures such as horizontal broken line undulations and horizontal curved undulations. The corrugation type, amplitude, and number of corrugations can all be designed and adjusted according to the length. Furthermore, the corrugation type, number of corrugations, and amplitude can be adjusted according to the fluid dynamics characteristics during the process, such as varying the number of corrugations, gradually weakening the amplitude, and coupling multiple corrugation types. Figure 8 This is a bipolar plate for a flow battery with reinforced flow channel based on an interdigitated main flow channel.
[0054] Replacing the main flow channel of the aforementioned corrugated interdigitated flow field with other corrugated flow channel structures can also yield the novel interdigitated flow field proposed in this patent, such as... Figure 9 The image shows some of the interdigital elements that can be replaced in the interdigital main flow field.
[0055] As a preferred embodiment of the present invention, the device further includes an electrolyte inlet 1 and an electrolyte outlet 2, which are respectively located above and below the flow channel unit 4. The liquid output end of the electrolyte inlet 1 is connected to the liquid input end of the flow channel unit 4, and the liquid output end of the flow channel unit 4 is connected to the input end of the electrolyte outlet 2.
[0056] Furthermore, it also includes an electrolyte conduction pipeline 5 for transporting electrolyte between different single cells.
[0057] Example 1 This embodiment provides a bipolar plate with a wavy horizontal corrugation combined with a serpentine flow field. The overall design area of the bipolar plate is 800 mm × 800 mm, employing a staggered flow channel design with a serpentine flow field. The formed flow channel depth is 1.5 mm, the flow channel width is 2.0 mm, the flow channel chamfer radius is 1.0 mm, and the demolding angle is 65°. The main flow field region adopts a wavy horizontal corrugation design with a wave amplitude of approximately 10 mm and 10 corrugations. The overall thickness of the bipolar plate is 3.9 mm, and its bending strength is tested to be 52 MPa.
[0058] Example 2 This embodiment provides a bipolar plate with a zigzag horizontal corrugation combined with an interdigitated flow field. The overall design area of the bipolar plate is 600 mm × 550 mm, employing an interlaced flow field design. The formed flow channel depth is 1.8 mm, the flow channel width is 2.5 mm, the flow channel chamfer radius is 1.0 mm, and the demolding angle is 60°. The main flow field region adopts a zigzag horizontal corrugation design with a zigzag amplitude of approximately 15 mm and 4 corrugations. The overall thickness of the bipolar plate is 4.5 mm, and its bending strength is tested to be 43 MPa.
[0059] Example 3 This embodiment provides a bipolar plate with a zigzag horizontal corrugation combined with a parallel flow field. The overall design area of the bipolar plate is 700 mm × 500 mm, employing a staggered flow channel design with a parallel flow field type. The formed flow channel depth is 1.5 mm, the flow channel width is 1.5 mm, the flow channel chamfer radius is 0.6 mm, and the demolding angle is 60°. The main flow field region adopts a zigzag horizontal corrugation design with a zigzag amplitude of approximately 20 mm and 3 corrugations. The overall thickness of the bipolar plate is 4.0 mm, and its bending strength is tested to be 36 MPa.
[0060] Example 4 This embodiment provides a bipolar plate with a zigzag horizontal corrugation combined with an interdigitated flow field. The overall design area of the bipolar plate is 700 mm × 700 mm, employing an interlaced flow field design. The formed flow channel depth is 2.0 mm, the flow channel width is 2.5 mm, the flow channel chamfer radius is 1.5 mm, and the demolding angle is 65°. The main flow field region adopts a zigzag horizontal corrugation design with a zigzag amplitude of approximately 20 mm and 5 corrugations. The overall thickness of the bipolar plate is 4.9 mm, and its bending strength is tested to be 45 MPa.
[0061] Example 5 This embodiment provides a bipolar plate with a wavy horizontal corrugation combined with a serpentine flow field. The overall design area of the bipolar plate is 600 mm × 600 mm, employing a staggered flow channel design with a serpentine flow field. The forming channel depth is 1.5 mm, the channel width is 2.0 mm, the channel chamfer radius is 1.0 mm, and the demolding angle is 60°. The main flow field region adopts a wavy horizontal corrugation design with a wave amplitude of 15 mm and 3 corrugations. The overall thickness of the bipolar plate is 3.9 mm, and its bending strength is tested to be 35 MPa.
[0062] Comparative Example 1 This comparative example provides a bipolar plate with a conventional symmetrical flow channel design for performance comparison with the embodiments described above. The overall design area of the bipolar plate is 600 mm × 600 mm, employing a symmetrical flow channel design with an interdigitated flow field type. The forming flow channel depth is 1.6 mm, the flow channel width is 1.0 mm, the flow channel chamfer radius is 0.8 mm, and the demolding angle is 75°. The main flow field region has a smooth, straight flow channel design. The overall thickness of the bipolar plate is 4.0 mm, and its bending strength is tested to be 25 MPa.
[0063] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.
[0064] In the above embodiments of the present invention, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.
[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.
Claims
1. A flow battery bipolar plate with alternating ribs and corrugated reinforcement, characterized in that, Includes bipolar plate substrate, flow channel unit, and rib unit; The bipolar plate substrate includes a first surface and a second surface. The first surface is provided with a first flow channel unit and a first rib unit, and the second surface is provided with a second flow channel unit and a second rib unit. The first flow channel unit and the second rib unit are opposite to each other in the vertical direction of the bipolar plate substrate, and the second flow channel unit and the first rib unit are opposite to each other in the vertical direction of the bipolar plate substrate. The flow channel unit is a corrugated flow channel, with a chamfer between the first rib unit and the first flow channel unit, and a chamfer between the second rib unit and the second flow channel unit.
2. The flow battery bipolar plate with reinforced flow channel by alternating ribs as described in claim 1, characterized in that, The width ratio of the first flow channel unit to the first rib unit is 1:20 to 1:1, the width ratio of the second flow channel unit to the second rib unit is 1:20 to 1:1, and the thickness of the bipolar plate flow field structure is less than or equal to 10 mm.
3. The flow battery bipolar plate with reinforced flow channel by alternating ribs as described in claim 1, characterized in that, The depth of the flow channel unit is 0.1 mm to 3 mm, and the width of the flow channel unit is 0.5 mm to 20 mm.
4. The flow battery bipolar plate with reinforced flow channel by alternating ribs as described in claim 1, characterized in that, The chamfer radius is 0.1 mm to 3 mm.
5. The flow battery bipolar plate with reinforced flow channel by alternating ribs as described in claim 1, characterized in that, It also includes an electrolyte inlet and an electrolyte outlet, which are respectively located above and below the flow channel unit. The liquid output end of the electrolyte inlet is connected to the liquid input end of the flow channel unit, and the liquid output end of the flow channel unit is connected to the input end of the electrolyte outlet.
6. The flow battery bipolar plate with reinforced flow channel by alternating ribs as described in claim 1, characterized in that, The wave pattern of the corrugated flow channel is a horizontal broken line wave, a horizontal curve wave, or a combination thereof. In one corrugated flow channel, the wave amplitude is 1 mm to 30 mm, and the number of waves is 2 to 20.
7. The flow battery bipolar plate with reinforced flow channel by alternating ribs as described in claim 1, characterized in that, The flow channel unit is a flow field structure with a parallel array backbone region. The flow field structure includes, but is not limited to, one or more combinations of parallel flow field, serpentine flow field, interdigitated flow field, multi-serpentine flow field or spiral serpentine flow field.
8. The flow battery bipolar plate with reinforced flow channel by alternating ribs as described in claim 1, characterized in that, The inner wall of the flow channel unit is provided with a demolding angle, which is 60°~90°.
9. The flow battery bipolar plate with reinforced flow channel by alternating ribs as described in claim 1, characterized in that, It also includes a common electrolyte flow channel for transporting electrolyte between different individual cells.