A composite flow channel frame for zinc-bromine liquid flow battery

Abstract

The invention discloses a composite flow channel frame for a zinc-bromine liquid flow battery, belongs to the field of zinc-bromine liquid flow batteries, comprises a flow channel frame body, the flow channel frame body is provided with a groove equidistant from the outer edge of the flow channel frame body, the outer edge of the flow channel frame body is provided with evenly distributed fixing grooves, and is characterized in that: evenly and parallelly distributed twill teeth are provided inside the groove, the twill teeth are Y-shaped convex structures, and every two adjacent twill teeth and the bottom of the groove form a cavity with a top opening, and the cavity is used to connect a sealing ring. The invention introduces the Y-shaped twill tooth structure, so that when the sealing ring is injected into the product, the molten rubber of the sealing ring invades the cavity under pressure, so that the joint surface of the Y-shaped twill teeth and the sealing ring forms an interactive three-dimensional structure, which can significantly enhance the bonding force, and is also conducive to fixing the sealing ring structure and slowing down overpressure deformation or dislocation.

Description

Technical Field

[0001] The utility model relates to the field of zinc-bromine liquid flow batteries, in particular to a zinc-bromine liquid flow battery composite flow channel frame which is mass-produced through a co-injection molding process, and the combination of an elastic body sealing ring and a flow channel frame is achieved through a whole set of processes. Background Art

[0002] In actual technical development, zinc-bromine flow batteries generally use a bipolar plate structure, that is, one side of the electrode plate is the negative electrode of the current group of cells, and the other side is the positive electrode of the next group of cells. The battery cells are stacked, and the plates on both sides of each battery cell are shared by the cells on both sides, so that a series system between multiple groups of cells is realized through the structure.

[0003] Due to the stacked structure of the internal components of the zinc-bromine flow battery and the requirement that the electrolyte must flow evenly through the surface of the diaphragm plate to react, the positive and negative electrodes inside the battery must each have a flow field with a certain structure, which can achieve a flow channel frame structure that is sealed inside and outside the battery. The flow channel frame structure must meet good sealing requirements: to ensure that there is no leakage outside the battery pack after assembly, and to ensure environmental friendliness.

[0004] At present, the energy storage industry has received strong support, and various energy storage batteries have begun to develop and gain attention. However, as a large-capacity and high-power energy storage battery, safety is the first necessary condition for energy storage batteries. For zinc-bromine flow batteries, good external sealing is particularly important to ensure that the electrolyte or volatile gas will not escape from the outside of the battery pack to the environment, and to ensure that the system is absolutely friendly and safe to the environment.

[0005] Existing flow channel frame external sealing method:

[0006] 1. Rubber sealing ring structure: Figure 1 As shown, a sealing ring groove is designed on the outer ring of the flow channel frame, and a sealing ring matching the groove structure is selected for manual assembly.

[0007] 2. Sealing rib structure: Figure 2 As shown in the figure, the commonly used sealing method of zinc-bromine flow battery is to directly process raised ribs on the path that needs to be sealed on one side of the flow channel frame, and the other side of the flow channel frame is a plane, and then use the compressible material properties of the flow frame plate itself to achieve contact compaction deformation sealing. That is, by pressurizing and tightening the entire battery pack, the raised line of the ribs on one side of the internal flow channel frame is directly pressed into the back plane of the flow channel frame located in front of it, resulting in a concave deformation seal.

[0008] Both of the above structures have obvious defects:

[0009] Rubber sealing ring structure: Rubber sealing rings include circular interface sealing rings, sticky rings and hot vulcanized molded rings. Both types of sealing rings are formed by hot vulcanized rubber. When the products are combined with the flow channel frame plate, they need to be manually assembled and bonded to the groove of the flow channel frame plate, which requires a lot of man-hours. At the same time, adhesives are required to bond the sealing rings. The introduced adhesives may cause contamination of the internal electrolyte. In addition, since the flow channel frame plates are mostly made of corrosion-resistant resin materials, their bonding strength is generally not very good.

[0010] Sealing rib structure: There is a common problem in the sealing rib structure. That is, with the long-term operation of the battery, the resin material of the flow channel frame will undergo a certain degree of creep deformation due to the influence of the environment and electrolyte, resulting in a weakening of the compaction of the sealing line. This is also an important reason for leakage in the later stage. Summary of the invention

[0011] In view of the above-mentioned problems existing in the prior art, the purpose of the utility model is to design a new type of flow channel frame, which can realize the injection molding of a circle of elastomeric sealing ring along the outer circle on the surface of the flow channel frame plate of the liquid flow battery through a special groove structure and injection molding process, so as to directly realize the integrated combination of the frame and the sealing ring through one-time injection molding.

[0012] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a composite flow channel frame for a zinc-bromine liquid flow battery, comprising a flow channel frame body, the flow channel frame body is provided with a groove equidistant from the outer edge of the flow channel frame body, and the outer edge of the flow channel frame body is provided with evenly distributed fixing grooves; the groove is provided with parallel distributed twill teeth, the twill teeth are Y-shaped raised structures, and every two adjacent twill teeth and the bottom of the groove form a cavity with a top opening, and the cavity is used to connect a sealing ring.

[0013] As a preferred structure of the utility model, the sealing ring is formed by injection molding, the sealing ring is flat as a whole, a raised strip is arranged on the outside to enhance the sealing after compression, and the inside is wrapped with twill teeth to form a sealed connection.

[0014] As a preferred structure of the utility model, the diagonal teeth are evenly arranged in the groove along the width direction of the groove.

[0015] The groove has a depth of 0.5-1 mm and a width of 3-8 mm.

[0016] As a preferred structure of the utility model, the width of the cavity is 0.3-1 mm.

[0017] As a preferred structure of the utility model, the height of the oblique teeth is slightly smaller than the depth of the groove.

[0018] As a preferred structure of the utility model, the thickness of the thinnest part of the sealing ring is slightly greater than the depth of the groove; the thickness of the sealing ring is 0.6-2mm.

[0019] As a preferred structure of the present invention, the distance between the groove and the outer edge of the frame is 3-5 mm.

[0020] As a preferred structure of the utility model, the inner wall of the cavity is a rough surface and is provided with a plurality of irregular protrusions and depressions.

[0021] As a preferred structure of the utility model, the diagonal teeth are designed to be wavy in the length direction.

[0022] Compared with the prior art, the technical solution disclosed in the present invention has the following beneficial effects:

[0023] 1. The present invention introduces a Y-shaped twill tooth structure so that when the sealing ring is injection molded, the molten rubber of the sealing ring invades the cavity under pressure, so that the joint surface of the Y-shaped twill tooth and the sealing ring forms an interactive three-dimensional structure, which can significantly enhance the bonding force and is also conducive to fixing the sealing ring structure and reducing overpressure deformation or dislocation.

[0024] 2. The present invention uses a special groove structure to effectively increase the interface bonding depth and bonding area when injection molding the elastomer sealing ring, and effectively improve the bonding strength.

[0025] 3. The present invention further increases the contact surface with the sealing ring and further improves the bonding strength by setting the inner wall of the cavity to a rough, uneven structure.

[0026] 4. The present invention further increases the contact surface with the sealing ring and further improves the bonding strength by setting the Y-shaped twill teeth to be wavy. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The figure is a schematic diagram of the structure of assembling a sealing ring and a groove in a flow channel frame in the prior art.

[0028] Figure 2 The figure is a schematic diagram of the sealing rib structure on the flow channel frame in the prior art.

[0029] Figure 3 This is a schematic diagram of the partial structure of a composite flow channel frame for a zinc-bromine flow battery in this embodiment.

[0030] Figure 4 It is a partially enlarged schematic diagram of a composite flow channel frame for a zinc-bromine flow battery in this embodiment.

[0031] Figure 5 Schematic diagram of the groove structure of a composite flow channel frame for a zinc-bromine flow battery in this embodiment.

[0032] Figure 6 This is a schematic diagram of the overall assembly of a composite flow channel frame for a zinc-bromine flow battery in this embodiment.

[0033] Among them, 1 is the flow channel frame body; 2 is the fixing groove; 3 is the groove; 4 is the diagonal teeth; 5 is the cavity; and 6 is the sealing ring. DETAILED DESCRIPTION

[0034] In order to explain the technical content, structural features, achieved objectives and effects of the technical solution in detail, the following is a detailed description in conjunction with specific embodiments and accompanying drawings.

[0035] like Figure 3-5 As shown, a schematic diagram of a composite flow channel frame structure for a zinc-bromine liquid flow battery in this embodiment includes a flow channel frame body 1, the flow channel frame body 1 is provided with a groove 3 equidistant from the outer edge of the flow channel frame body 1, and the outer edge of the flow channel frame body 1 is provided with evenly distributed fixing grooves 2; the groove 3 is provided with parallel distributed twill teeth 4, the twill teeth 4 are Y-shaped protruding structures, and every two adjacent twill teeth 4 and the bottom of the groove 3 form a cavity 5 with a top opening, and the cavity 5 is used to connect a sealing ring 6.

[0036] like Figure 6 As shown, the sealing ring 6 is formed by injection molding. The sealing ring 6 is flat as a whole, with a raised strip on the outside to enhance the sealing after compression, and the twill teeth 4 are wrapped inside to form a sealed connection, and the overall line diameter direction is a closed ring. The Y-shaped twill teeth 4 structure will allow the molten rubber of the sealing ring 6 to invade the cavity 5 under pressure when the sealing ring 6 is injected, so that the joint surface of the Y-shaped twill teeth 4 and the sealing ring 6 forms an interactive three-dimensional structure, which can significantly enhance the bonding force, and is also conducive to fixing the sealing ring structure and reducing overpressure deformation or dislocation.

[0037] As a preferred embodiment of this embodiment, the material of the sealing ring is corrosion-resistant thermoplastic elastomer, and the injection molding process is insert injection molding.

[0038] like Figure 5 As shown, the oblique teeth 4 are evenly arranged in the groove 3 along the width direction of the groove 3.

[0039] As a preferred structure of this embodiment, the groove 3 has a depth of 0.5-1 mm and a width of 3-8 mm.

[0040] As a preferred structure of this practical example, the width of the cavity 5 is 0.3-1 mm.

[0041] As a preferred structure of this practical example, the height of the oblique teeth 4 is slightly smaller than the depth of the groove 3 .

[0042] As a preferred structure of this practical example, the thickness of the thinnest part of the sealing ring 6 is slightly greater than the depth of the groove 3; the thickness of the sealing ring 6 is about 0.6-2 mm.

[0043] As a preferred structure of this practical example, the distance between the groove 3 and the outer edge of the frame is 3-5 mm.

[0044] As a preferred structure of this practical example, the inner wall of the cavity is set to a rough surface with multiple irregular protrusions and depressions, so as to further enhance the bonding force between the Y-shaped twill teeth 4 and the sealing ring 6 by increasing the contact area.

[0045] As a preferred structure of this practical example, the twill teeth are not limited to being straight in length, and may be wavy in design, which also further enhances the bonding force between the Y-shaped twill teeth 4 and the sealing ring 6 by increasing the contact area.

[0046] It should be noted that although the above embodiments have been described in this article, this does not limit the scope of patent protection of the utility model. Therefore, based on the innovative concept of the utility model, changes and modifications to the embodiments described herein, or equivalent structural or equivalent process transformations made using the contents of the utility model specification and drawings, directly or indirectly applying the above technical solutions to other related technical fields, are all included in the scope of patent protection of the utility model.

Claims

1. A composite flow channel frame for a zinc-bromine liquid flow battery, comprising a flow channel frame body, the flow channel frame body being provided with grooves equidistant from the outer edge of the flow channel frame body, and the outer edge of the flow channel frame body being provided with evenly distributed fixing grooves, characterized in that: The groove is provided with parallel distributed twill teeth, the twill teeth are Y-shaped protruding structures, and every two adjacent twill teeth and the bottom of the groove form a cavity with a top opening, and the cavity is used to connect the sealing ring.

2. A composite flow channel frame for zinc-bromine liquid flow battery according to claim 1, characterized in that: The sealing ring is formed by injection molding. The sealing ring is flat as a whole and is a closed ring in the overall line diameter direction. A raised strip is arranged on the outside of the sealing ring to enhance the sealing performance after compression, and the inside is wrapped with twill teeth to form a sealed connection.

3. A composite flow channel frame for zinc-bromine liquid flow battery according to claim 1 or 2, characterized in that: The diagonal teeth are evenly arranged in the groove along the width direction of the groove.

4. A composite flow channel frame for zinc-bromine liquid flow battery according to claim 1 or 2, characterized in that: The groove has a depth of 0.5-1 mm and a width of 3-8 mm.

5. A composite flow channel frame for zinc-bromine liquid flow battery according to claim 1 or 2, characterized in that: The width of the cavity is 0.3-1 mm.

6. A composite flow channel frame for zinc-bromine liquid flow battery according to claim 4, characterized in that: The height of the diagonal teeth is slightly smaller than the depth of the grooves.

7. A composite flow channel frame for zinc-bromine liquid flow battery according to claim 4, characterized in that: The thickness of the thinnest part of the sealing ring is slightly greater than the depth of the groove; the thickness of the sealing ring is 0.6-2mm.

8. The composite flow channel frame for zinc-bromine liquid flow battery according to claim 1, characterized in that: The distance between the groove and the outer edge of the frame is 3 to 5 mm.

9. The composite flow channel frame for zinc-bromine liquid flow battery according to claim 1, characterized in that: The inner wall of the cavity is a rough surface and is provided with a plurality of irregular protrusions and depressions.

10. The composite flow channel frame for zinc-bromine liquid flow battery according to claim 1, characterized in that: The twill teeth are designed to be wavy in the length direction.

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