A kind of integrated end plate structure with busbar for liquid flow battery

Abstract

The utility model discloses a kind of integrated end plate structure with busbar for liquid flow battery, it includes integrated end plate with busbar, integrated end plate with busbar includes the first layer board, second layer board and several busbars integrally formed using thermoplastic high molecular material, several busbars are symmetrically arranged in the two sides of second layer board, first layer board is sequentially welded with end piece bipolar plate and end plate flow guide plate;The integrated end plate structure with busbar of the present scheme not only effectively solves the introduction and output of electrolyte, the introduction and output of current, and the problem such as electrolyte equipartition;While its structure design and sealing system work cooperatively, jointly guarantee the ability of internal cross contamination and external leakage resistance of electric pile in long-term operation, is indispensable important component part for maintaining system reliability and safety.

Description

Technical Field

[0001] This utility model relates to the field of flow battery technology, specifically to an integrated end plate structure with a manifold for flow batteries. Background Technology

[0002] A vanadium redox flow battery stack is a combination of multiple individual cells stacked together, with multiple channels and a unified current output. During charging and discharging, the positive and negative electrolytes enter the stack and are then evenly distributed to all individual cells, participating in the charging and discharging reactions within each cell. After the reaction is complete, the electrolytes are collected together and flow out of the stack. Its endplate structure not only needs to guide the electrolyte to flow evenly into and out of each individual cell, but also needs to realize the collection and conduction of current.

[0003] Currently, endplate structures typically adopt a split structure, with each component connected by laser welding or ultrasonic welding. Although this structure can achieve the functions of electrolyte distribution and current convergence, due to the large number of welding points, complex processes, uneven strength at the welds, and stress concentration, it is prone to incomplete welding, cracking, or even leakage due to factors such as changes in ambient temperature and material differences. This affects the sealing performance, safety, and service life of the fuel cell stack, while also increasing manufacturing and maintenance costs. Utility Model Content

[0004] To address the aforementioned shortcomings of the prior art, this utility model provides an integrated end plate structure with a manifold for flow batteries, thereby solving the technical problems mentioned in the background section.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: An integrated endplate structure with manifolds for flow batteries is provided, comprising an integrated endplate with manifolds, the integrated endplate with manifolds including a first layer plate, a second layer plate and a plurality of manifolds integrally formed from thermoplastic polymer material, the plurality of manifolds being symmetrically arranged on both sides of the second layer plate, the first layer plate being welded sequentially to the end plate bipolar plate and the endplate guide plate.

[0006] Furthermore, the thermoplastic polymer material is one or more of polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyoxymethylene, polycarbonate, glass fiber, or acrylic plastics.

[0007] Furthermore, there are four manifolds, and the four manifolds correspond to the inlet and outlet of the positive electrode and the inlet and outlet of the negative electrode of the electrolyte, respectively.

[0008] Furthermore, the first layer plate is provided with an inlay structure for mounting the end bipolar plate.

[0009] Furthermore, the first layer plate, the end plate bipolar plate, and the end plate guide plate are all placed on a welding fixture for laser welding, and the welding joint is pressed tightly by a pressure plate fixture. The welding fixture is provided with a fixture hole for avoiding the manifold.

[0010] The beneficial effects of this utility model are as follows: 1. The integrated end plate structure with manifold in this solution not only effectively solves the problems of electrolyte introduction and extraction, current introduction and extraction, and electrolyte distribution; at the same time, its structural design and sealing system work together to ensure the stack's ability to resist internal cross-contamination and external leakage during long-term operation, which is an indispensable and important component for maintaining system reliability and safety.

[0011] 2. This solution reduces the number of parts and welding points through an integrated molding design, thereby reducing process waste and welding risks caused by multiple welding processes, lowering the risk of leakage due to poor welding, effectively improving the service life of the battery stack, and enhancing sealing performance to effectively prevent electrolyte leakage and cross-contamination. This reduces the frequency of later maintenance and replacement, making it suitable for long-term operation flow battery systems with low maintenance costs. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. The above and other objects, features, and advantages of the present invention will become clearer through the drawings. The same reference numerals indicate the same parts in all the drawings. The drawings are not intentionally drawn to scale with actual dimensions; the focus is on illustrating the main idea of ​​the present utility model.

[0013] Figure 1 This is an exploded view of the proposed solution.

[0014] Figure 2 This is a structural diagram of an integrated end plate with a manifold nozzle.

[0015] Figure 3 This is a schematic diagram of the structure for welding an integrated end plate with a manifold nozzle to a bipolar plate.

[0016] Figure 4 This is a schematic diagram of the structure of the integrated end plate with manifold and the end plate guide plate welded together.

[0017] Among them, 1. Integrated end plate with manifold, 2. First layer plate, 3. Second layer plate, 4. Manifold, 5. End plate bipolar plate, 6. End plate guide plate, 7. Welding fixture, 8. Pressure plate fixture, 9. Fixture hole. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0020] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0021] Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0022] like Figures 1 to 4 As shown, the integrated endplate structure with manifolds for flow batteries in this design includes an integrated endplate 1 with manifolds 4. The integrated endplate 1 with manifolds 1 comprises a first layer plate 2, a second layer plate 3, and four manifolds 4 integrally molded from thermoplastic polymer material. The four manifolds 4 are symmetrically arranged on both sides of the second layer plate 3. The first layer plate 2 is sequentially welded to the end bipolar plate 5 and the endplate guide plate 6. In particular, to facilitate understanding of the structure of the integrated endplate 1 with manifolds, this design... Figure 1 The exploded view shows the integrated end plate 1 with manifolds divided into a first layer plate 2, a second layer plate 3, and four manifolds 4. However, in actual implementation, the integrated end plate 1 with manifolds is a one-piece molded structure, such as... Figure 2 As shown; the function of the manifold 4 in this scheme is to directly guide the electrolyte into and out of the stack; the function of the first plate 2 and the second plate 3 is to support the copper electrode and ensure the compression ratio of the end plate graphite felt; the function of the end plate guide plate 6 is to evenly distribute the electrolyte to the positive and negative electrode areas of each single cell and guide the electrolyte to evenly enter and exit the graphite felt electrode; the function of the end plate bipolar plate 5 is to connect adjacent single cells in the stack, block the positive and negative electrode electrolytes, and collect and transmit the current generated by the reaction of the electrodes on both sides.

[0023] In specific implementation, the thermoplastic polymer material is one or more of polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyoxymethylene, polycarbonate, glass fiber, or acrylic plastics; the number of manifolds 4 is four, and the four manifolds 4 correspond to the inlet and outlet of the positive electrode and the inlet and outlet of the negative electrode of the electrolyte, respectively; the first layer plate 2 is provided with an inlay structure for installing the end plate bipolar plate 5; the first layer plate 2, the end plate bipolar plate 5 and the end plate guide plate 6 are all placed on the welding fixture 7 for laser welding, and the weld joint is pressed tightly by the pressure plate fixture 8, and the welding fixture 7 is provided with fixture holes 9 for avoiding the manifolds 4.

[0024] In summary, the integrated end plate 1 structure with manifold 4 in this solution not only effectively solves the problems of electrolyte introduction and extraction, current introduction and extraction, and electrolyte distribution; but also, its structural design and sealing system work together to ensure the stack's ability to resist internal cross-contamination and external leakage during long-term operation, making it an indispensable and important component for maintaining system reliability and safety. In addition, this solution, through its integrated molding design, reduces the number of parts and welding points, reduces process waste and welding risks caused by multiple welding processes, lowers the risk of leakage due to poor welding, effectively improves the service life of the stack, and enhances sealing performance, effectively preventing electrolyte leakage and cross-contamination, thereby reducing the frequency of later maintenance and replacement. It is suitable for long-term operation flow battery systems and has low maintenance costs.

[0025] Although the specific embodiments of the utility model have been described in detail with reference to the accompanying drawings, they should not be construed as limiting the scope of protection of this patent; various modifications and variations that can be made by those skilled in the art without inventive effort within the scope described in the claims are still within the scope of protection of this patent.

Claims

1. An integrated endplate structure with a manifold for a flow battery, characterized in that, The device includes an integrated end plate with manifolds. The integrated end plate with manifolds includes a first plate, a second plate, and a plurality of manifolds integrally formed from thermoplastic polymer material. The plurality of manifolds are symmetrically arranged on both sides of the second plate. The first plate is sequentially welded to the end bipolar plate and the end plate guide plate.

2. The integrated end plate structure with manifold for a flow battery according to claim 1, characterized in that, The thermoplastic polymer material is one or more of polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyoxymethylene, polycarbonate, glass fiber, or acrylic plastics.

3. The integrated end plate structure with manifold for a flow battery according to claim 1, characterized in that, The number of manifolds is four, and the four manifolds correspond to the inlet and outlet of the positive electrode and the inlet and outlet of the negative electrode of the electrolyte, respectively.

4. The integrated end plate structure with manifold for a flow battery according to claim 1, characterized in that, The first layer plate is provided with an inlay structure for mounting the end bipolar plate.

5. The integrated end plate structure with manifold for a flow battery according to claim 1, characterized in that, The first layer plate, the end plate bipolar plate, and the end plate guide plate are all placed on a welding fixture for laser welding, and the weld joint is pressed tightly by a pressure plate fixture. The welding fixture is provided with a fixture hole for avoiding the manifold.

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