All-vanadium redox flow battery pile end plate anti-deformation pile tightening mechanism

Abstract

The utility model relates to an all-vanadium redox flow battery pile end plate anti-deformation pile tightening mechanism, which comprises an anti-deformation pressing plate, a fixing screw, and an anti-deformation cross beam or an anti-deformation T-shaped beam used for fastening two sides of a pile, the anti-deformation pressing plate is mounted on the outer side of the electric pile end plate through a fixing screw, and the anti-deformation cross beam or the anti-deformation T-shaped beam is positioned and fastened through a positioning device. The pile end plate anti-deformation pile tightening mechanism provided by the utility model is mounted outside the pile, the whole device is simple to mount, the normal operation of the pile is not influenced, the bending strength of the end plate can be enhanced with the assistance of the base plate and the steel, the deformation of the end plate is effectively reduced, and the service life is prolonged. And the situation that the efficiency of the galvanic pile is reduced due to non-uniform electrolyte distribution and leakage caused by deformation of the end plate is avoided to a certain extent.

Description

Technical Field

[0001] The utility model belongs to the technical field of liquid flow batteries, and in particular relates to a device for preventing deformation and tightening stacks of end plates of all-vanadium liquid flow battery stacks. Background Art

[0002] Nowadays, electric energy is a secondary energy source necessary for social development and human production. With the continuous development of science and technology, people's demand for electric energy in production and life is increasing. Due to the environmental pollution and energy depletion caused by the large-scale use of fossil energy, renewable energy such as wind energy, solar energy, tidal energy, etc. has received great attention. However, renewable energy is affected by climate and environment, and power generation is unstable, discontinuous, and uncontrollable. Therefore, it is necessary to store and release electric energy through energy conversion.

[0003] Liquid flow batteries have the advantages of high safety, long cycle life, low environmental load, and recyclable battery materials, and can achieve large-scale energy storage.

[0004] The main components of the all-vanadium liquid flow battery stack include: end plates, current collecting plates, electrode frames, bipolar plates, electrodes and ion conduction membranes. The function of the end plates on both sides of the stack is to press the middle components to achieve the purpose of tightening and sealing.

[0005] The existing all-vanadium liquid flow battery stack is fastened inside the stack by end plates on both sides. The main function is to compress the internal structure, reduce the internal resistance of the battery, and prevent leakage of the stack. However, during the operation of the stack, the end plates are subjected to a large outward force from the inside of the stack, causing the end plates to deform. The deformation mostly occurs in the middle of the end plates, with a deformation amount of 1.5 to 3.5 mm.

[0006] At present, the materials of the end plates used in the fuel cell stack are mostly low-carbon steel and insulating materials, such as Q215, Q235, epoxy resin, fiberglass, etc., with a thickness between 10 and 30 mm. During the operation of the fuel cell stack, the end plates are deformed by the thrust from the inside to the outside, and the middle position of the end plates protrudes outward by about 1.5-3.5 mm. The deformation of the end plates not only affects the compression of the electrodes, but also affects the uniformity of the internal distribution of the electrolyte, resulting in increased internal resistance, reduced energy efficiency, and in severe cases, electrolyte leakage.

[0007] In summary, the current anti-deformation measures or devices for the end plates of all-vanadium liquid flow batteries in this field are not perfect, and there is an urgent need for an anti-deformation and tight stacking device that can effectively prevent deformation from causing leakage and affecting the efficiency of the battery stack. Utility Model Content

[0008] The utility model discloses an anti-deformation and tight stacking device for an end plate of an all-vanadium liquid flow battery stack, which reduces the deformation of the end plate without changing the overall structure of the original stack, and can prevent internal and external leakage caused by deformation of the end plate to a certain extent.

[0009] The utility model adopts the following technical scheme: an anti-deformation and tightening mechanism for an end plate of an all-vanadium liquid flow battery stack, comprising an anti-deformation pressure plate, fixing screws, and an anti-deformation beam or anti-deformation T-beam for tightening both sides of the stack; the anti-deformation pressure plate is installed on the outer side of the stack end plate by fixing screws, and the anti-deformation beam or anti-deformation T-beam is positioned and tightened by a positioning device.

[0010] The positioning device is a crossbeam fastener, and can also be an adjustable positioning device provided with a trapezoidal lead screw and a stack support frame.

[0011] As a preferred embodiment, the anti-deformation and tightening mechanism for the end plate of the all-vanadium liquid flow battery stack includes an anti-deformation pressure plate, fixing screws, an anti-deformation beam, and a beam fastener; the anti-deformation pressure plate is installed on the outside of the stack end plate by fixing screws; the two sides of the stack are fastened with anti-deformation beams, and the anti-deformation beams are positioned and fastened by beam fasteners.

[0012] Furthermore, the anti-deformation beam includes I-beams, channel steels, square steels, aluminum profiles, and round bars, and the length can be designed according to different models of battery stacks.

[0013] As another preferred embodiment, the positioning device of the utility model adopts an adjustable positioning device, in which a trapezoidal screw is installed on the cross beam of the battery stack support frame, an anti-deformation T-beam on one side is welded to the battery stack support frame, and the anti-deformation T-beam on the other side cooperates with the trapezoidal screw, and an anti-deformation top rod is also provided on the battery stack support frame, and a rubber pad is bonded to the upper end of the anti-deformation top rod.

[0014] More specifically, the anti-deformation and tightening mechanism for the end plate of the all-vanadium liquid flow battery stack includes: a trapezoidal screw, a handle, a stack support frame, an anti-deformation push rod, a rubber pad, and an anti-deformation T-beam. The anti-deformation pressure plate is installed on the outside of the end plate by fixing screws, the handle is welded to the trapezoidal screw, the trapezoidal screw is installed on the middle cross beam below the stack support frame, the anti-deformation T-beam on the right is welded to the stack support frame, the anti-deformation T-beam on the left has threads to cooperate with the trapezoidal screw, the anti-deformation push rods on the left and right sides are installed on the stack support frame in the form of a rotating pair, and rubber pads are bonded to the upper ends of the anti-deformation push rods.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] The anti-deformation and tight stacking mechanism for the end plate of the fuel cell stack provided by the utility model is installed on the outside of the fuel cell stack. The overall device is simple to install and does not affect the normal operation of the fuel cell stack. With the assistance of the pad and the steel, the bending strength of the end plate can be enhanced, and the deformation of the end plate can be effectively reduced. To a certain extent, the occurrence of uneven distribution of electrolyte inside the fuel cell stack and reduced efficiency of the fuel cell stack caused by leakage of the fuel cell stack due to the deformation of the end plate is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of all-vanadium liquid flow battery stack;

[0018] Figure 2 yes Figure 1 The mechanical finite element analysis diagram of the end plate under stress state is shown;

[0019] Figure 3 is a schematic diagram of a thick end plate part of Example 1;

[0020] Figure 4 yes Figure 3 The mechanical finite element analysis diagram of the thick end plate under stress is shown;

[0021] Figure 5 is a schematic diagram of the overall structure of Example 2;

[0022] Figure 6 is an overall schematic diagram of different beam structures in Example 2;

[0023] Figure 7 It is a mechanical finite element analysis diagram of the end plate under stress in Example 2;

[0024] Figure 8 is a front axonometric view of Embodiment 3;

[0025] Fig. 9 is a rear axonometric view of Embodiment 3;

[0026] Fig.10 This is an overall schematic diagram of Example 3 after the battery stack is installed;

[0027] Fig.11 It is a mechanical finite element analysis diagram of the end plate under stress in Example 3.

[0028] Markings in the figure: 11- stack end plate, 12- battery assembly inside the stack, 13- fastening structure, 111- stress center area of ​​the end plate, 112- stress edge of the end plate, 21- thick end plate, 31- anti-deformation pressure plate, 32- screws, 33- anti-deformation beam, 34- beam fastener, 41- trapezoidal lead screw, 42- handle, 43- stack support frame, 44- anti-deformation push rod, 45- rubber pad, 46- anti-deformation T-beam. DETAILED DESCRIPTION

[0029] In order to more clearly explain the purpose, technical solutions and advantages of the present disclosure, the embodiments of the present disclosure will be described in detail below in conjunction with the accompanying drawings. It should be understood that the following description of the embodiments is intended to explain and illustrate the overall concept of the present disclosure and should not be understood as a limitation of the present disclosure. In the specification and the drawings, the same or similar reference numerals refer to the same or similar parts or components. For the sake of clarity, the drawings are not necessarily drawn to scale, and some well-known parts and structures may be omitted in the drawings.

[0030] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. The wording "one" or "an" does not exclude multiple. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right", "top" or "bottom" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. When an element such as a layer, a film, a region or a substrate substrate is referred to as being "on" or "under" another element, the element may be "directly" located "on" or "under" another element, or there may be an intermediate element.

[0033] Attached Figure 1 The figure shows an axonometric schematic diagram of an all-vanadium liquid flow battery stack known in the art, comprising: an end plate (11), a battery assembly (12), and a fastening structure (13);

[0034] As attached Figure 2 As shown, Figure 1 In the finite element mechanical analysis of the middle end plate (11) under stress, the stress area is not the area of ​​the entire end plate, but the area of ​​the end plate (11) acted outward by the battery assembly (12) inside the battery stack; Figure 2 As shown, the deformation degree at the position in the center area (111) of the end plate is relatively large, which is 3.1143 mm. However, the deformation degree gradually decreases from the center to the surrounding areas, and the deformation degree at the edge (112) of the end plate is the lowest.

[0035] Example 1

[0036] like Figure 3 As shown, this embodiment uses a thick end plate to replace the traditional stack end plate to achieve the purpose of reducing deformation. The thick end plate (21) is an end plate with a thickness of 50 mm. Figure 4 The figure shows the deformation cloud diagram of the 50mm thick end plate under load by finite element analysis. Figure 4 It can be seen that the deformation of the rear end plate is reduced from 3.11mm to 1.18mm by adopting this method, but the use of thick end plates makes the mass of a single end plate larger, causing difficulties in installation and disassembly, and increasing the production and manufacturing costs of the fuel cell stack.

[0037] Example 2

[0038] As attached Figure 5and attached Figure 6 As shown, an anti-deformation tightening mechanism for the stack end plate is provided on the outer side of the stack end plate, wherein the anti-deformation tightening mechanism for the stack end plate comprises: an anti-deformation pressure plate (31), screws (32), an anti-deformation cross beam (33), and a cross beam fastener (34). The anti-deformation pressure plate (31) is installed on the outer side of the stack end plate by means of screws (32), and its main function is to transmit the tightening force and prevent the anti-deformation steel from directly contacting the end plate and causing damage to the end plate; the two sides of the stack are tightened by the anti-deformation cross beam (33), and the anti-deformation cross beam (33) includes but is not limited to Figure 5 or Figure 6 The steel material shown in the figure can be replaced by various steel profiles, such as I-beams, channel steels, square steels, aluminum profiles, round bars, etc., and the length can be designed according to different types of fuel cell stacks; generally speaking, the length of the anti-deformation beam (33) exceeds the length of the fuel cell stack end plate (11). The anti-deformation beam (33) is positioned and fastened by a beam fastener (34).

[0039] As attached Figure 7 The finite element mechanical analysis of the end plate (11) in this embodiment 2 is shown. Figure 2 In comparison, the deformation of the rear end plate is reduced from 3.11mm to 0.98mm after the anti-deformation beam structure is adopted. The deformation position is in a small area above and below the stress-bearing area of ​​the end plate, and the middle position can achieve a better tightening effect.

[0040] Example 3

[0041] As attached Figure 8-Figure 10 As shown, a stack end plate anti-deformation tightening mechanism is arranged on the outer side of the stack end plate, and the stack end plate anti-deformation tightening mechanism is adjustable, and specifically comprises: a trapezoidal lead screw (41), a handle (42), a stack support frame (43), an anti-deformation push rod (44), a rubber pad (45), and an anti-deformation T-beam (46), wherein the anti-deformation pressure plate (31) and the fixing screw (32) have the same function as in Example 2, and the anti-deformation pressure plate (31) is also installed on the outer side of the stack end plate by the fixing screw (32), and the handle (42) is welded to the trapezoidal lead screw (41), and the trapezoidal lead screw (43) is welded to the outer side of the stack end plate. The rod (41) is installed at the middle crossbeam below the battery stack support frame (43), the anti-deformation T-beam (46) on the right is welded to the battery stack support frame (43), and the anti-deformation T-beam (46) on the left has a thread that cooperates with the trapezoidal lead screw (41) and can be moved left and right to achieve positioning and pressing of battery stacks with different numbers of sections. The anti-deformation push rods (44) on the left and right sides are installed on the battery stack support frame (43) in the form of a rotating pair. A rubber pad (45) is bonded to the upper end of the anti-deformation push rod (44), the main purpose of which is to increase friction and prevent metal from being deformed due to direct contact force.

[0042] As attached Fig.11The figure shows the finite element mechanical analysis result of the end plate (11) in the stress state in the third embodiment, and Figure 2 In comparison, the deformation of the end plate is reduced from 3.11mm to 1.09mm, and Fig.11 From the deformation cloud map, it can be found that the deformation distribution at the center of the end plate is more uniform, and the force is no longer concentrated in the central area. This method effectively reduces the deformation of the end plate.

[0043] The above is only a preferred specific implementation method of the utility model, but the protection scope of the utility model is not limited to it. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and utility model concept of the utility model within the technical scope disclosed by the utility model, which should be covered by the protection scope of the utility model.

Claims

1. A deformation-proof and tight stacking mechanism for the end plate of an all-vanadium liquid flow battery stack, characterized in that: It comprises an anti-deformation pressure plate (31), fixing screws (32), and an anti-deformation cross beam (33) or an anti-deformation T-beam (46) for fastening the fuel cell stack; the anti-deformation pressure plate (31) is installed on the outer side of the fuel cell stack end plate by means of the fixing screws (32), and the anti-deformation cross beam (33) or the anti-deformation T-beam (46) is positioned and fastened by means of a positioning device; The positioning device is a crossbeam fastener (34), or an adjustable positioning device provided with a trapezoidal lead screw (41) and a stack support frame (43).

2. The anti-deformation tight stacking mechanism according to claim 1, characterized in that: The anti-deformation and tightening mechanism for the end plate of the all-vanadium liquid flow battery stack comprises an anti-deformation pressure plate (31), fixing screws (32), an anti-deformation cross beam (33), and a cross beam fastener (34); the anti-deformation pressure plate (31) is installed on the outer side of the end plate of the stack by means of the fixing screws (32); the two sides of the stack are tightened by means of the anti-deformation cross beam (33), and the anti-deformation cross beam (33) is positioned and tightened by means of the cross beam fastener (34).

3. The anti-deformation tight stacking mechanism according to claim 2, characterized in that: The deformable cross beam (33) includes I-beams, channel steels, square steels, aluminum profiles, and round bars, and the length can be designed according to different types of battery stacks.

4. The anti-deformation tight stacking mechanism according to claim 1, characterized in that: In the adjustable positioning device, the trapezoidal lead screw (41) is installed on the crossbeam of the battery stack support frame (43), the anti-deformation T-beam (46) on one side is welded to the battery stack support frame (43), and the anti-deformation T-beam (46) on the other side cooperates with the trapezoidal lead screw (41), and an anti-deformation top rod (44) is also provided on the battery stack support frame (43), and a rubber pad (45) is bonded to the upper end of the anti-deformation top rod (44).

5. The anti-deformation compacting mechanism according to claim 4, characterized in that: The anti-deformation and tightening mechanism of the end plate of the all-vanadium liquid flow battery stack comprises: a trapezoidal screw (41), a handle (42), a stack support frame (43), an anti-deformation push rod (44), a rubber pad (45), and an anti-deformation T-beam (46). The anti-deformation pressure plate (31) is installed on the outer side of the end plate through a fixing screw (32). The handle (42) is welded to the trapezoidal screw (41) as a whole. The trapezoidal screw (41) is installed at the middle crossbeam below the stack support frame (43). The right anti-deformation T-beam (46) is welded to the stack support frame (43). The left anti-deformation T-beam (46) has a thread and cooperates with the trapezoidal screw (41). The anti-deformation push rods (44) on both sides are installed on the stack support frame (43) in the form of a rotating pair. The rubber pad (45) is bonded to the upper end of the anti-deformation push rod (44).

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