A flow battery stack glue injection sealing structure and glue injection method

Abstract

The present invention discloses a liquid flow battery stack glue injection sealing structure and a glue injection method, the purpose is to solve the technical problems that the existing stack sealing structure is easy to fail and the removal cost is high. The technical scheme is: a liquid flow battery stack glue injection sealing structure and a glue injection method, including a plurality of electrode frames, an upper end plate and a lower end plate, glue injection grooves are provided on both sides of the electrode frame, a connecting hole is provided between the two glue injection grooves, a plurality of electrode frames are stacked to form a stack, the upper end plate is arranged on the top surface of the stack, the lower end plate is arranged on the bottom surface of the stack, and is fixedly connected by a screw rod, two glue injection holes are provided on the top surface of the upper end plate, and a connected glue injection channel is formed between the glue injection groove, the connecting hole and the glue injection hole, and the glue injection hole can also be provided on the side of the electrode frame. Through the glue injection sealing surface structure, the present invention can improve the applicability and durability of the seal while ensuring the sealing effect, and extend the service life of the battery stack seal.

Description

Technical Field

[0001] The invention belongs to the technical field of all-vanadium liquid flow batteries, and in particular relates to a liquid flow battery stack glue injection sealing structure and a glue injection method. Background Art

[0002] Liquid flow batteries achieve the mutual conversion of electrical energy and chemical energy through reversible redox reactions (i.e., reversible changes in valence states) of the active substances in the positive and negative electrolyte solutions. Unlike general solid-state batteries, the positive and negative electrolyte solutions of liquid flow batteries are stored in tanks outside the battery and transported to the inside of the battery through pumps and pipelines for reaction. So when the system is running, the inside of the liquid flow battery stack is always under liquid pressure. Over time, the aging of the sealing components in the stack will inevitably run, bubble, drip, and leak.

[0003] Currently in the liquid flow battery industry, there are mainly three sealing structures: sealing wire sealing, self-sealing, and hot-melt adhesive film sealing. However, these technical solutions all have problems that are difficult to coordinate and solve: Sealing wire sealing, the main problem is not only the inconvenient assembly, but the aging and failure of the sealing wire is the main problem leading to leakage of the battery stack; Self-sealing, self-sealing uses the elastic-plasticity of the material of the frame plate itself to achieve sealing through layer-by-layer lamination. This sealing method can achieve a good sealing effect in a short time, but the material will inevitably age and lose its elasticity, and its long-term performance cannot be guaranteed; Hot-melt film sealing, hot-melt film sealing uses hot-melt film as the sealing material. Since the hot-melt film is very thin, it can effectively achieve sealing, but when the battery stack is running, the electrolyte temperature rises and the hot-melt film will overflow, resulting in sealing failure.

[0004] When the flow battery stack is assembled, it is tested for airtightness. The stack will leak without a sealing structure. If the flow frame is equipped with a sealing structure, the stack will leak partially. If the leaking stack is to be dismantled and reassembled, it will cost labor and materials, and the cost is high, and the sealing effect may not be guaranteed. Summary of the invention

[0005] The object of the present invention is to provide a liquid flow battery stack glue injection sealing structure and a glue injection method to solve the above technical problems.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A liquid flow battery stack injection sealing structure comprises a plurality of electrode frames, an upper end plate and a lower end plate, wherein fixing holes are provided at the same position at four corners of the electrode frame, the upper end plate and the lower end plate, a circle of first glue injection grooves are provided around one side of the membrane side of the electrode frame, a circle of second glue injection grooves are provided at the same position as the first glue injection grooves on one side of the plate side of the electrode frame, first connecting holes and second connecting holes are provided on both sides of the electrode frame between the first and second glue injection grooves, respectively, the plurality of electrode frames are stacked to form a battery stack, the upper end plate is arranged on the top surface of the battery stack, the lower end plate is arranged on the bottom surface of the battery stack, the upper end plate, the battery stack and the lower end plate are fixedly connected by screws passing through the fixing holes, the first and second glue injection holes are provided on both sides of the top surface of the upper end plate, a connected glue injection channel is formed between the first and second glue injection grooves, the first and second connecting holes, and the first and second glue injection holes are both connected to the glue injection channel.

[0008] Preferably, the cross-sectional area of ​​the first connecting hole and the second connecting hole are both larger than the cross-sectional area of ​​the first glue injection groove or the second glue injection groove.

[0009] A glue injection sealing structure for a flow battery stack comprises a plurality of electrode frames, an upper end plate and a lower end plate, wherein fixing holes are provided at the same position at four corners of the electrode frame, the upper end plate and the lower end plate, a circle of first glue injection grooves are provided around one surface of the membrane side of the electrode frame, a circle of second glue injection grooves are provided at the same position as the first glue injection grooves on one surface of the plate side of the electrode frame, first glue injection holes and second glue injection holes are provided on the outer electrode frames on both sides of the first glue injection grooves and the second glue injection grooves, the plurality of electrode frames are stacked to form a stack, the upper end plate is arranged on the top surface of the stack, the lower end plate is arranged on the bottom surface of the stack, the upper end plate, the stack and the lower end plate are fixedly connected by screws passing through the fixing holes, a glue injection channel is formed between the first glue injection grooves and the second glue injection grooves between the upper and lower adjacent electrode frames, and the first glue injection holes and the second glue injection holes are both connected to the glue injection channel.

[0010] Preferably, the cross-sectional shape of the first glue injection groove and the second glue injection groove may be any one of a semicircle, an ellipse, a star or a square.

[0011] A method for injecting glue into a flow battery stack comprises the following steps:

[0012] S1: After the battery stack is assembled, use a glue injection machine to inject glue into the first glue injection hole or the second glue injection hole on the upper end plate;

[0013] S2: The glue injection machine maintains pressure when injecting glue into the glue injection channel, so that the glue flows along the glue injection channel;

[0014] S3: When glue continues to overflow from the first glue injection hole or the second glue injection hole on the other side, glue injection is stopped;

[0015] S4: Let the battery stack stand for a while after the glue is injected, and perform an airtight test after the glue is cured.

[0016] A method for injecting glue into a flow battery stack comprises the following steps:

[0017] S1: After the battery stack is assembled, glue is injected into the first glue injection hole or the second glue injection hole on the side of the electrode frame using a glue injection machine;

[0018] S2: The glue injection machine maintains pressure when injecting glue into the glue injection channel, so that the glue flows along the glue injection channel;

[0019] S3: When glue continues to overflow from the first glue injection hole or the second glue injection hole on the other side, stop injecting glue into the glue injection channel of this layer;

[0020] S4: Repeat step S3 continuously to inject glue into each layer of the glue injection channel until all the steps are completed;

[0021] S5: Let the battery stack stand for a while after the glue is injected, and perform an airtight test after the glue is cured.

[0022] The beneficial effects of the present invention are:

[0023] 1. The present invention effectively solves the sealing problem on both sides of the liquid flow electrode frame during the battery stack assembly process by providing a glue injection groove on the liquid flow electrode frame frame;

[0024] 2. The present invention can improve the applicability and durability of the seal and extend the service life of the battery stack seal by using the glue injection sealing surface structure while ensuring the sealing effect;

[0025] 3. The present invention has the advantages of simple structure, easy assembly, simple operation, excellent sealing effect, low cost, strong practicability and is suitable for mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the membrane side structure of the electrode frame of the first embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the electrode frame plate side structure of the first embodiment of the present invention;

[0028] Figure 3 It is a schematic diagram of the middle section of the glue injection sealing structure of the first embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of the electrode frame structure of the second embodiment of the present invention;

[0030] Figure 5 for Figure 4 A partial enlarged schematic diagram of the middle A area;

[0031] Figure 6 It is a schematic diagram of the middle section of the glue injection sealing structure of the second embodiment of the present invention;

[0032] Figure 7 for Figure 6 A partial enlarged schematic diagram of the middle B area;

[0033] Reference numerals: 1, electrode frame; 2, first glue injection groove; 3, first connecting hole; 4, second connecting hole; 5, second glue injection groove; 6, fixing hole; 7, upper end plate; 8, lower end plate; 9, first glue injection hole; 10, second glue injection hole; DETAILED DESCRIPTION

[0034] In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments and drawings, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0035] The specific embodiments of the present invention are described below with reference to the accompanying drawings.

[0036] Embodiment 1:

[0037] A liquid flow battery stack injection sealing structure, comprising a plurality of electrode frames 1, an upper end plate 7 and a lower end plate 8, wherein the electrode frame 1, the upper end plate 7 and the lower end plate 8 are provided with fixing holes 6 at the same position at four corners, a first glue injection groove 2 is provided around one side of the membrane side of the electrode frame 1, and a second glue injection groove 5 is provided at the same position as the first glue injection groove 2 on one side of the plate side of the electrode frame 1, wherein the first glue injection groove 2 and the second glue injection groove 5 are semicircular grooves, and a first connecting hole 3 and a second connecting hole 4 are provided on both sides of the electrode frame 1 between the first glue injection groove 2 and the second glue injection groove 5, respectively, and the first connecting hole 3 The cross-sectional areas of the second connecting hole 4 are both larger than the cross-sectional areas of the first glue injection groove 2 and the second glue injection groove 5. The several electrode frames 1 are stacked to form a battery stack. The upper end plate 7 is arranged on the top surface of the battery stack, and the lower end plate 8 is arranged on the bottom surface of the battery stack. The upper end plate 7, the battery stack, and the lower end plate 8 are fixedly connected by screws passing through the fixing holes 6. The first glue injection hole 9 and the second glue injection hole 10 are opened on both sides of the top surface of the upper end plate 7. A connected glue injection channel is formed between the first glue injection groove 2, the second glue injection groove 5, the first connecting hole 3, and the second connecting hole 4. The first glue injection hole 9 and the second glue injection hole 10 are both connected to the glue injection channel.

[0038] The cross-sectional shape of the first glue injection groove 2 and the second glue injection groove 5 may also be any one of an ellipse, a star or a square.

[0039] The glue injection method using the liquid flow battery stack glue injection sealing structure comprises the following steps:

[0040] S1: After the battery stack is assembled, glue is injected into the first glue injection hole 9 on the upper end plate 7 using a glue injection machine;

[0041] S2: The glue injection machine maintains pressure when injecting glue into the glue injection channel, and the glue flows into the second glue injection groove 5 through the first connecting hole 3, and flows to the other side along the first glue injection groove 2 and the second glue injection groove 5 under pressure. During the flow process, the air in the original glue injection groove flows from the second connecting hole 4 to the second glue injection hole 10 and is discharged so that the glue can smoothly fill the glue injection channel;

[0042] S3: When glue keeps overflowing from the second glue injection hole 10, it indicates that the glue injection channel is full of glue, and glue injection is stopped;

[0043] S4: Let the battery stack stand for a while after the glue is injected, and perform an airtight test after the glue is cured.

[0044] Embodiment 2:

[0045] The difference between this embodiment and embodiment 1 lies in that a first glue injection hole 9 and a second glue injection hole 10 are provided on the outer electrode frame 1 on both sides of the first glue injection groove 2 and the second glue injection groove 5, and a glue injection channel is formed between the first glue injection groove 2 and the second glue injection groove 5 between the upper and lower adjacent electrode frames 1, and the first glue injection hole 9 and the second glue injection hole 10 are both connected to the glue injection channel, and the other structures are the same as those in embodiment 1.

[0046] The glue injection method using the liquid flow battery stack glue injection sealing structure comprises the following steps:

[0047] S1: After the battery stack is assembled, glue is injected into the first glue injection hole 9 using a glue injection machine;

[0048] S2: The glue injection machine maintains pressure when injecting glue into the glue injection channel, so that the glue flows along the first glue injection groove 2 and the second glue injection groove 5, and at the same time, the air in the original channel is discharged from the second glue injection hole 10;

[0049] S3: When glue keeps overflowing from the second glue injection hole 10, it indicates that the glue in the first glue injection groove 2 and the second glue injection groove 5 is full, and glue injection into the glue injection channel of this layer is stopped;

[0050] S4: Repeat step S3 continuously to inject glue into each layer of the glue injection channel until all the steps are completed;

[0051] S5: Let the battery stack stand for a while after the glue is injected, and perform an airtight test after the glue is cured.

[0052] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0053] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A flow battery stack injection sealing structure, characterized in that: The invention comprises a plurality of electrode frames (1), an upper end plate (7) and a lower end plate (8), wherein fixing holes (6) are provided at the same position at four corners of the electrode frame (1), the upper end plate (7) and the lower end plate (8), a circle of first glue injection grooves (2) are provided around one side of the membrane side of the electrode frame (1), a circle of second glue injection grooves (5) are provided at the same position as the first glue injection grooves (2) on one side of the plate side of the electrode frame (1), a first connecting hole (3) and a second connecting hole (4) are provided on both sides of the electrode frame (1) between the first glue injection grooves (2) and the second glue injection grooves (5), and the A plurality of electrode frames (1) are stacked to form a battery stack, the upper end plate (7) is arranged on the top surface of the battery stack, and the lower end plate (8) is arranged on the bottom surface of the battery stack. The upper end plate (7), the battery stack, and the lower end plate (8) are fixedly connected by screws passing through fixing holes (6). A first glue injection hole (9) and a second glue injection hole (10) are provided on both sides of the top surface of the upper end plate (7), and a connected glue injection channel is formed between the first glue injection groove (2), the second glue injection groove (5), the first connecting hole (3), and the second connecting hole (4), and the first glue injection hole (9) and the second glue injection hole (10) are both connected to the glue injection channel.

2. A flow battery stack glue injection sealing structure according to claim 1, characterized in that: The cross-sectional areas of the first connecting hole (3) and the second connecting hole (4) are both larger than the cross-sectional areas of the first glue injection groove (2) or the second glue injection groove (5).

3. A flow battery stack injection sealing structure, characterized in that: The invention comprises a plurality of electrode frames (1), an upper end plate (7) and a lower end plate (8), wherein fixing holes (6) are provided at the same position at four corners of the electrode frame (1), the upper end plate (7) and the lower end plate (8), a first glue injection groove (2) is provided around one side of the membrane side of the electrode frame (1), a second glue injection groove (5) is provided at the same position as the first glue injection groove (2) on one side of the plate side of the electrode frame (1), and the electrode frame (1) is provided with a plurality of fixing holes (6) at the same position at four corners of the electrode frame (1), a first glue injection groove (2) is provided around one side of the membrane side of the electrode frame (1), a second glue injection groove (5) is provided at the same position as the first glue injection groove (2) on one side of the plate side of the electrode frame (1), and a second glue injection groove (5) is provided on the outer sides of the first glue injection groove (2) and the second glue injection groove (5). A first glue injection hole (9) and a second glue injection hole (10), the plurality of electrode frames (1) are stacked to form a battery stack, the upper end plate (7) is arranged on the top surface of the battery stack, the lower end plate (8) is arranged on the bottom surface of the battery stack, the upper end plate (7), the battery stack, and the lower end plate (8) are fixedly connected by screws passing through the fixing holes (6), a glue injection channel is formed between the first glue injection groove (2) and the second glue injection groove (5) between the upper and lower adjacent electrode frames (1), and the first glue injection hole (9) and the second glue injection hole (10) are both connected to the glue injection channel.

4. A flow battery stack glue injection sealing structure according to any one of claims 1 or 3, characterized in that: The cross-sectional shape of the first glue injection groove (2) and the second glue injection groove (5) is any one of a semicircle, an ellipse, a star or a square.

5. A method for injecting glue using the injection seal structure of a flow battery stack according to claim 1, characterized in that: The steps include: S1: After the battery stack is assembled, glue is injected into the first glue injection hole (9) or the second glue injection hole (10) on the upper end plate (7) using a glue injection machine; S2: The glue injection machine maintains pressure when injecting glue into the glue injection channel, so that the glue flows along the glue injection channel; S3: When glue continues to overflow from the first glue injection hole (9) or the second glue injection hole (10) on the other side, glue injection is stopped; S4: Let the battery stack stand for a while after the glue is injected, and perform an airtight test after the glue is cured.

6. A method for injecting glue using the injection seal structure of a flow battery stack according to claim 3, characterized in that: The steps include: S1: After the battery stack is assembled, glue is injected into the first glue injection hole (9) or the second glue injection hole (10) on the side of the electrode frame (1) using a glue injection machine; S2: The glue injection machine maintains pressure when injecting glue into the glue injection channel, so that the glue flows along the glue injection channel; S3: When glue continues to overflow from the first glue injection hole (9) or the second glue injection hole (10) on the other side, stop injecting glue into the glue injection channel of this layer; S4: Repeat step S3 continuously to inject glue into each layer of the glue injection channel until all the steps are completed; S5: Let the battery stack stand for a while after the glue is injected, and perform an airtight test after the glue is cured.

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