Airtightness detection tool for redox flow battery stack

Abstract

The utility model discloses an airtight detection tool for a redox flow battery stack, and belongs to the technical field of new energy. The flow cell stack airtightness detection tool mainly comprises a first clamping plate and a second clamping plate, the first clamping plate and the second clamping plate are stacked on the two opposite end faces of a stack unit respectively, and a detection air port is formed in the first clamping plate and externally connected with an air pressure detection system. A detection gas port in the clamping plate I is aligned and communicated with a test port of an electrolyte flow channel inlet / outlet in the opposite end surface of the galvanic pile unit, a non-test port of the electrolyte flow channel inlet / outlet of the galvanic pile unit is blocked by the clamping plate II and / or the clamping plate I, and the clamping plate I, the clamping plate II and the galvanic pile unit are stacked on a pressing machine together to carry out a pressing process of the galvanic pile unit. According to the airtight detection tool for the redox flow battery stack, the airtight detection process after cold pressing or hot pressing of the stack unit can be simplified, so that the labor and time are reduced, and the cost is saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to new energy technology field, concretely relates to liquid flow battery electric pile airtight detection frock. BACKGROUND

[0002] Liquid flow battery is mainly composed of electrochemical reaction electric pile (a plurality of single cell series connection) and storage positive and negative electrolyte storage tank.

[0003] In the production process of the existing liquid flow battery electric pile, after the electric pile unit is assembled, it needs to be hot-pressed and then cold-pressed, and then moved to the air test procedure for air tightness test, the procedure is complicated, a large amount of manpower and time are needed, and the production cost is increased.

[0004] Therefore, it is necessary to provide a liquid flow battery electric pile airtight detection frock capable of simplifying the procedure. UTILITY MODEL CONTENT

[0005] Based on the above problems existing in the prior art, the purpose of the utility model embodiment is to provide a liquid flow battery electric pile airtight detection frock, which can simplify the air tightness test procedure after the electric pile unit is cold-pressed, thereby reducing labor, time and cost.

[0006] To achieve the above purpose, the utility model adopts the technical scheme of providing a liquid flow battery electric pile airtight detection frock, which comprises a clamping plate one and a clamping plate two, the clamping plate one and the clamping plate two are respectively stacked on the opposite two end faces of the electric pile unit, a detection gas port is formed in the clamping plate one, the detection gas port on the clamping plate one is connected with a gas pressure detection system, the detection gas port on the clamping plate one is aligned with and communicated with the test port of the electrolyte flow channel inlet and outlet on the opposite end face of the electric pile unit, the non-test port of the electrolyte flow channel inlet and outlet of the electric pile unit is blocked by the clamping plate two and / or the clamping plate one, and the clamping plate one and the clamping plate two are stacked on a press together with the electric pile unit.

[0007] Further, the liquid flow battery electric pile airtight detection frock further comprises a gas connection plate, the gas connection plate is located at one end of the clamping plate one away from the clamping plate two, the gas connection plate is provided with a gas connection hole, a first end of the gas connection hole is aligned with and communicated with the detection gas port on the clamping plate one, and a second end of the gas connection hole is connected with the gas pressure detection system through a pipeline.

[0008] Further, the liquid flow battery electric pile airtight detection frock further comprises a sealing ring, the sealing ring is arranged between the clamping plate one and the electric pile unit, or the sealing ring is arranged between the clamping plate one and the electric pile unit and the clamping plate two and the electric pile unit, and the sealing ring is arranged at the electrolyte flow channel inlet and outlet of the electric pile unit.

[0009] Further, one side of the sealing ring facing the electric pile unit is provided with an anti-sticking coating.

[0010] Further, the side of the stack unit is provided with a stack connecting lug for structural positioning, the side of the first clamp plate is provided with a connecting lug one corresponding to the stack connecting lug on the stack unit, the side of the second clamp plate is provided with a connecting lug two corresponding to the stack connecting lug on the stack unit, and the connecting lug one, the connecting lug two and the stack connecting lug are in position matching.

[0011] Further, the air receiving plate is provided with a positioning hole, and the positioning hole is in position matching with the connecting lug one, the connecting lug two and the stack connecting lug.

[0012] Further, the air receiving plate, the first clamp plate, the stack unit and the second clamp plate form a compression detection matching body; and at least two groups of the compression detection matching bodies are sequentially stacked on a compression machine.

[0013] Further, the air receiving hole on the air receiving plate is in L-shaped structure, one end of the air receiving hole penetrates to the end face of the first clamp plate facing the stack unit, and the other end of the air receiving hole penetrates to the side of the air receiving plate.

[0014] Further, the first clamp plate and the second clamp plate are provided with an anti-sticking coating facing the stack unit.

[0015] Further, the first clamp plate is provided with two detection air holes.

[0016] The liquid flow battery stack air tightness detection tool has the advantages that:

[0017] The liquid flow battery stack air tightness detection tool comprises a first clamp plate and a second clamp plate, the first clamp plate and the second clamp plate are respectively stacked on the opposite two end faces of a stack unit, the first clamp plate is provided with a detection air hole, the detection air hole on the first clamp plate is in position matching and communication with a test port of an electrolyte flow channel inlet and outlet on the end face of the stack unit facing each other, the non-test port of the electrolyte flow channel inlet and outlet of the stack unit is blocked by the second clamp plate and / or the first clamp plate, the electrolyte flow channel of the stack unit is inflated to form a gas pressure difference through the detection air hole, and the air tightness of the electrolyte channel of the stack unit is detected, the first clamp plate and the second clamp plate of the liquid flow battery stack air tightness detection tool provided in the embodiment of the utility model enter a compression machine together with the stack unit to perform a compression process of the stack unit, the air tightness of the stack unit can be detected on the cold compression machine in a cold compression holding state after cold compression is completed, the air tightness detection process after the stack unit is operated on the cold and hot compression machines in the prior art is simplified, the production process is simplified, and thus the labor, time and cost are reduced.

[0018] The liquid flow battery stack air tightness detection tool is used for air measurement of a semi-finished product stack, can reduce the air measurement process, can assemble current collecting plates, insulating plates, end plates and other components after air measurement is passed, and avoids the need to disassemble the stack when air measurement is unqualified, and in addition, the first clamp plate and the second clamp plate also have a protection effect on the bipolar plates at the two ends of the semi-finished product stack, and prevent the bipolar plates from being damaged by the compression machine.

[0019] The flow battery stack air tightness testing fixture provided by this utility model allows for the stacking of several stack units together with the flow battery stack air tightness testing fixture onto a cold press after the stack units have been hot-pressed. After the cold pressing is completed, air tightness testing can be performed directly on multiple stack units on the cold press, further improving production efficiency. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 A reference diagram showing the usage status of the flow battery stack airtightness testing fixture provided in this embodiment of the utility model.

[0022] Figure 2 for Figure 1 An exploded view of the structure shown.

[0023] Figure 3 This is a perspective view of the air receiving plate provided in an embodiment of the present utility model.

[0024] Figure 4 An exploded view of the flow battery stack airtightness testing fixture provided in this embodiment of the present invention when simultaneously measuring two stack units.

[0025] The following are the labeling elements in the figure:

[0026] 100. Fuel cell stack unit; 101. Fuel cell stack connecting lug;

[0027] 1. Clamping plate 1; 11. Connecting lug 1; 12. Air inlet for testing;

[0028] 2. Clamping plate two; 21. Connecting ear two;

[0029] 3. Sealing ring;

[0030] 5. Air inlet plate; 51. Air inlet hole; 52. Positioning hole. Detailed Implementation

[0031] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0032] It should be noted that when a component is referred to as "connected to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0033] In the description of the utility model, it is necessary to explain that, unless there is definite stipulation and limitation, the term "mount", "link", "connect" should be broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through intermediate medium, can be two element internal communication or two element mutual action relationship。For ordinary skilled person in the art, the specific meaning of the above-mentioned term in the utility model can be understood according to specific circumstances.

[0034] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0035] Throughout this specification, reference to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. Therefore, the appearances of the phrases "in one embodiment", "in some embodiments", or "in some embodiments" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0036] Please refer to Figures 1 to 3As shown, the liquid flow battery stack airtight detection tool provided by the utility model is used for airtightness detection of the stack unit 100, at least one end face of the stack unit 100 is distributed with the inlet and outlet of the electrolyte flow channel, the liquid flow battery stack airtight detection tool comprises a clamping plate one 1 and a clamping plate two 2, the clamping plate one 1 and the clamping plate two 2 are respectively stacked on the opposite two end faces of the stack unit 100, a detection gas port 12 is formed in the clamping plate one 1, the detection gas port 12 is connected with the air pressure detection system, the detection gas port 12 on the clamping plate one 1 is aligned with and communicated with the test port of the inlet and outlet of the electrolyte flow channel on the end face of the stack unit 100, and the non-test port of the inlet and outlet of the electrolyte flow channel on the stack unit 100 is blocked by the clamping plate two 2 and / or the clamping plate one 1; the air pressure detection system fills the electrolyte flow channel and the electrode cavity of the stack unit 100 through the detection gas port 12 to form an air pressure difference, so that the airtightness of the stack unit 100 is detected. The clamping plate one 1 and the clamping plate two 2 in the liquid flow battery stack airtight detection tool provided by the utility model embodiment are stacked on the press together with the stack unit 100, the stack unit 100 is pressed, after cold pressing, the cold press still holds the clamping plate one 1, the clamping plate two 2 and the stack unit 100, the non-test port of the inlet and outlet of the electrolyte flow channel is blocked by the holding of the cold press, the airtightness of the stack unit 100 can be directly detected on the cold press, compared with the prior art, the airtightness detection process after the stack unit 100 is operated on the cold and hot press is simplified, the production process is simplified, so that the labor, time and cost are reduced.

[0037] Specifically, the stack unit 100 to be detected for airtightness is not limited, can be an assembled stack, can be a semi-finished stack assembled by a plurality of single batteries through bipolar plates and not yet assembled with current collecting plates, insulating plates, end plates and the like, or can be an experimental stack with a small number of single battery units. When the stack unit 100 is a semi-finished stack, the semi-finished stack is directly detected for air after cold pressing on the cold press, not only the air detection process can be reduced, but also the current collecting plates, insulating plates, end plates and the like can be assembled after the air detection is passed, so that the stack needs to be disassembled when the air detection is not qualified. When the stack unit 100 is a semi-finished stack, the clamping plate one 1 and the clamping plate two 2 also have a protection effect on the bipolar plates at the two ends of the semi-finished stack, preventing the press from damaging the bipolar plates. The air pressure detection system can use an existing automatic air detection detector.

[0038] As shown in Figure 1 and Figure 2As shown in some embodiments, the flow battery stack airtightness detection tool further comprises a gas connection plate 5 located at one end of the first clamp plate 1 away from the second clamp plate 2, and the gas connection plate 5 is provided with a gas connection hole 51, the first end of the gas connection hole 51 is aligned with and communicates with the detection gas port 12 on the first clamp plate 1, and the second end of the gas connection hole 51 is connected to the gas pressure detection system through a pipeline. The gas pressure detection system is used to pump gas into the detection gas port 12 for detecting the airtightness of the stack unit 100. Specifically, the gas connection plate 5 is installed on the press. The provision of the gas connection plate 5 makes it more convenient to externally connect the gas pressure detection system to the press.

[0039] As shown in some embodiments, Figure 2 As shown in some embodiments, the flow battery stack airtightness detection tool further comprises a sealing ring 3, which is located between the first clamp plate 1 and the stack unit 100, or between the first clamp plate 1 and the stack unit 100 and between the second clamp plate 2 and the stack unit 100, and is provided at the inlet and outlet of the electrolyte flow channel. When the first clamp plate 1, the second clamp plate 2 and the stack unit 100 are combined, the sealing ring 3 provided at the inlet and outlet of the electrolyte flow channel can seal the gap between the stack unit 100 and the first clamp plate 1 and the second clamp plate 2, so that gas can only flow between the detection gas port 12 and the test port of the inlet and outlet of the electrolyte flow channel on the stack unit 100, and ensure the sealing effect of the non-test port of the inlet and outlet of the electrolyte flow channel.

[0040] In some embodiments, the side of the sealing ring 3 facing the stack unit 100 is provided with an anti-sticking coating, which facilitates the separation of the sealing ring 3 from the stack unit 100. In this embodiment, the side of the sealing ring 3 facing the stack unit 100 is pasted or coated with a Teflon material. After cold pressing, there may be overflow at the inlet and outlet of the electrolyte flow channel. The provision of the anti-sticking coating can prevent the sealing ring 3 from sticking to the stack unit 100. Teflon also has elasticity in terms of anti-sticking effect, which can further enhance the sealing effect of the sealing ring 3.

[0041] As shown in some embodiments, Figure 2 As shown in some embodiments, the side of the stack unit 100 is provided with a stack connecting lug 101 for structural positioning, the side of the first clamp plate 1 is provided with a connecting lug one 11 corresponding to the stack connecting lug 101 on the stack unit 100, and the side of the second clamp plate 2 is provided with a connecting lug two 21 corresponding to the stack connecting lug 101 on the stack unit 100. The connecting lug one 11, the connecting lug two 21 and the stack connecting lug 101 are aligned and matched, so that the first clamp plate 1, the second clamp plate 2 and the stack unit 100 are positioned relative to each other, and the first clamp plate 1 and the second clamp plate 2 are stably clamped on the two end faces of the stack unit 100. The positioning structure is not limited, for example, the stack connecting lug 101, the connecting lug one 11 and the connecting lug two 21 are all provided with positioning holes, and the first clamp plate 1, the second clamp plate 2 and the stack unit 100 can be positioned by sequentially passing positioning pins through the positioning holes on the connecting lug two 21, the stack connecting lug 101 and the connecting lug one 11.

[0042] like Figure 3 As shown, in some embodiments, the gas receiving plate 5 is provided with a positioning hole 52, which is positioned and engaged with the first connecting ear 11, the second connecting ear 21 and the fuel cell stack connecting ear 101 so that the positioning pins on the first connecting ear 11, the second connecting ear 21 and the fuel cell stack connecting ear 101 are aligned and positioned in the positioning hole 52, so that the gas receiving plate 5, the first clamping plate 1, the second clamping plate 2 and the fuel cell stack unit 100 are positioned relative to each other.

[0043] In some embodiments, the clamping plate 1 is provided with two detection air ports 12, and the air receiving plate 5 is provided with two air receiving holes 51. The two detection air ports 12 are respectively corresponding to and connected to the test ports of the anode electrolyte flow channel inlet and outlet and the cathode electrolyte flow channel inlet and outlet of the fuel cell unit 100, so as to simultaneously or sequentially realize the airtightness detection of the anode electrolyte flow channel, anode cavity and cathode electrolyte flow channel and cathode cavity in the fuel cell unit 100.

[0044] like Figure 1 and Figure 3 As shown, in some embodiments, the air inlet 51 on the air inlet plate 5 has an L-shaped structure. One end of the air inlet 51 extends through to the end face of the air inlet plate 5 facing the clamp 1, and the other end of the air inlet 51 extends through to the side of the air inlet plate 5 so as to connect the air inlet 51 with the external pipeline.

[0045] In some of these embodiments, see Figure 4 A set of press-fit testing components is formed by gas receiving plate 5, clamping plate one 1, fuel cell stack unit 100, and clamping plate two 2; at least two sets of press-fit testing components are stacked sequentially on the press. Multiple sets of gas receiving plates 5, clamping plate one 1, fuel cell stack unit 100, and clamping plate two 2 can be stacked sequentially on the cold press simultaneously. When testing experimental fuel cell stacks or semi-finished fuel cell stacks, gas testing can be performed on multiple fuel cell stack units 100 simultaneously, further improving production efficiency.

[0046] In some embodiments, clamp 1 and clamp 2 are made of copper and have an anti-stick coating (preferably Teflon) on their end faces facing the fuel cell unit 100. This gives clamp 1 and clamp 2 excellent thermal conductivity and a certain degree of elasticity, which can protect the bipolar plates at both ends of the semi-finished fuel cell unit from damage. It also facilitates the heat conduction of clamp 1 and clamp 2 to the fuel cell unit 100, improving work efficiency. Furthermore, it can prevent clamp 1 and clamp 2 from sticking to the fuel cell unit 100.

[0047] In some embodiments, the sealing ring 3 is made of copper, which makes the sealing ring 3 elastic and provides good sealing performance through elastic deformation.

[0048] In some embodiments, the sealing ring 3 has an annular structure and a thickness of 0.6 mm.

[0049] The above merely describes the preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A flow battery stack airtightness testing fixture, characterized in that: The device includes a first clamp and a second clamp, which are stacked on opposite end faces of the fuel cell stack unit. The first clamp has a detection port connected to an external air pressure detection system. The detection port on the first clamp is aligned with and communicates with the test ports of the electrolyte flow channel inlet and outlet on the opposite end face of the fuel cell stack unit. The non-test ports of the electrolyte flow channel inlet and outlet of the fuel cell stack unit are blocked by the second clamp and / or the first clamp. The first clamp and the second clamp are stacked together with the fuel cell stack unit on the press.

2. The flow battery stack airtightness testing fixture according to claim 1, characterized in that: The flow battery stack air tightness testing fixture also includes an air receiving plate, which is located at the end of clamping plate one away from clamping plate two. The air receiving plate is provided with an air receiving hole. The first end of the air receiving hole is aligned with and communicates with the detection air port on clamping plate one. The second end of the air receiving hole is connected to the air pressure detection system through a pipeline.

3. The flow battery stack airtightness testing fixture according to claim 1, characterized in that: The flow battery stack airtightness testing fixture also includes a sealing ring, which is placed between the first clamping plate and the stack unit, or between the first clamping plate and the stack unit and between the second clamping plate and the stack unit, and the sealing ring is located at the inlet and outlet of the electrolyte flow channel of the stack unit.

4. The flow battery stack airtightness testing fixture according to claim 3, characterized in that: The sealing ring has an anti-stick coating on the side facing the fuel cell unit.

5. The flow battery stack airtightness testing fixture according to claim 2, characterized in that: The side of the fuel cell stack unit is provided with fuel cell stack connecting lugs for structural positioning. The side of the clamping plate one is provided with connecting lug one corresponding to the fuel cell stack connecting lug on the fuel cell stack unit, and the side of the clamping plate two is provided with connecting lug two corresponding to the fuel cell stack connecting lug on the fuel cell stack unit. Connecting lug one, connecting lug two and fuel cell stack connecting lug are aligned and fitted together.

6. The flow battery stack airtightness testing fixture according to claim 5, characterized in that: The gas receiving plate is provided with positioning holes, which are positioned and engaged with the first connecting lug, the second connecting lug, and the fuel cell stack connecting lug.

7. The flow battery stack airtightness testing fixture according to claim 2, characterized in that: The gas receiving plate, clamping plate one, fuel cell stack unit, and clamping plate two form a set of press-fit testing assembly; at least two sets of the press-fit testing assembly are stacked sequentially on the press.

8. The flow battery stack airtightness testing fixture according to claim 2, characterized in that: The air inlet on the air inlet plate has an L-shaped structure. One end of the air inlet extends through to the end face of the air inlet plate facing the clamping plate, and the other end extends through to the side of the air inlet plate.

9. The flow battery stack airtightness testing fixture according to claim 1, characterized in that: The side of clamp plate one and clamp plate two facing the fuel cell unit is provided with an anti-stick coating.

10. The flow battery stack airtightness testing fixture according to any one of claims 1-9, characterized in that: Two detection air ports are provided on the clamp plate.

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