Liquid separation connector of flow battery

Abstract

The utility model relates to the technical field of flow batteries, in particular to a liquid separation connector of a flow battery, which comprises a connecting plate fixedly connected to the side surface of a galvanic pile, and the connecting plate is attached to one side of the galvanic pile and is provided with grooves with the same size as electrolyte exchange ports corresponding to the electrolyte exchange ports of each single battery piece in the galvanic pile. The groove directly faces the electrolyte exchange port and is attached to the electrolyte exchange port; the connecting plate is provided with a liquid distribution pipe corresponding to each groove, one end of each liquid distribution pipe is connected with the main pipeline, and the other end of each liquid distribution pipe is communicated to the corresponding groove; the problems that in the prior art, liquid is fed through a single-side end plate, and the flow of electrolyte in a galvanic pile is uneven are solved, multi-channel synchronous feeding and discharging of the electrolyte are achieved through the liquid separation connector of the flow battery, the electrolyte is directly fed and discharged through the liquid separation pipes corresponding to the single battery pieces, and the flow and the flow speed of the electrolyte of the single battery pieces are the same; and electrolyte inter-string among the single battery pieces is avoided, and the overall power supply and charging efficiency of the flow battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of flow batteries, and particularly relates to a flow battery liquid distribution connector. Background Art

[0002] A flow battery is a new type of storage battery. A flow battery is a high-performance storage battery that separates the positive and negative electrolytes and circulates them separately, and has the characteristics of high capacity, wide application fields, and long cycle service life. It is a new energy product. A flow battery is composed of a stack unit, electrolytes, an electrolyte storage and supply unit, a management and control unit, and other parts.

[0003] In the prior art, for example, in a flow battery stack structure with the application number CN202111489661.1, each stack includes two end plates on the left and right. Between the two end plates, a plurality of single cells are spaced by bipolar plates from left to right in sequence. Each single cell includes a positive electrode located in the middle through hole of the positive electrode frame, an ion conduction membrane, and a negative electrode located in the middle through hole of the negative electrode frame, which are stacked in sequence from left to right. At corresponding positions on the left end plate and the bipolar plate, N through holes serving as positive electrolyte inlets, N through holes serving as positive electrolyte outlets, N through holes serving as negative electrolyte inlets, and N through holes serving as negative electrolyte outlets are respectively opened. Channels are formed in series through the through holes, so that the positive and negative electrolytes enter and exit each single cell through the channels. In the prior art, a main pipeline and a main valve are used to supply liquid to all single cell plates in the stack. Since the single cell plates close to the main valve and those far from the main valve are under different electrolyte pressures, the electrolyte flow rate and velocity will also be different, which will lead to uneven electrolyte flow rate in the stack and reduce the overall power supply and charging efficiency of the flow battery. Summary of the Utility Model

[0004] Aiming at the deficiencies of the prior art, the purpose of the utility model is to provide a flow battery liquid distribution connector that can ensure the same electrolyte flow rate and velocity in all single cell plates in the stack during the power supply and charging processes.

[0005] The technical solution adopted by the utility model to solve its technical problems is as follows:

[0006] A flow battery liquid distribution connector includes a connecting plate fixedly connected to the side of the stack. The connecting plate is attached to one side of the stack, and grooves are provided corresponding to the electrolyte exchange ports of each single cell plate in the stack. A liquid distribution pipe is provided corresponding to each groove on the connecting plate. One end of the liquid distribution pipe is connected to the main pipeline, and the other end communicates with the groove.

[0007] The utility model adopting the above technical solution, compared with the prior art, has the prominent feature that:

[0008] It solves the problem of uneven electrolyte flow in the stack caused by liquid inlet from a single-sided end plate in the prior art. Through the liquid flow battery liquid distribution connector, multi-channel synchronous inlet and outlet of electrolyte are realized. The electrolyte directly enters and exits through the respective liquid distribution pipes corresponding to the single cell slices. The electrolyte flow rate and velocity of each single cell slice are the same, and internal cross-flow of electrolyte between single cell slices is also avoided, improving the overall power supply and charging efficiency of the liquid flow battery.

[0009] Preferably, a further technical solution of the present utility model is:

[0010] Preferably, the connecting plate and the stack are hermetically connected by welding glue; the connection has good sealing performance and can prevent electrolyte leakage.

[0011] Preferably, the connecting plate is provided with a welding groove on one side fitting against the stack; by providing the welding groove, the contact area between the connecting plate and the welding glue is increased, making the sealed connection between the connecting plate and the stack more firm.

[0012] Preferably, the left and right sides of the connecting plate are provided with outwardly protruding lip plates, and the single cell slice flow guiding frame is provided with slots corresponding to the lip plates; making the connection between the connecting plate and the single cell slice more firm and the sealing effect better.

[0013] Preferably, the groove has the same size as the electrolyte exchange port, and the groove is directly opposite to and fits on the electrolyte exchange port. Description of the Drawings

[0014] Figure 1 is a schematic structural diagram of the connection between the liquid distribution connector and the stack in an embodiment of the present utility model;

[0015] Figure 2 is a schematic structural diagram of the liquid distribution connector in an embodiment of the present utility model;

[0016] Figure 3 is another schematic structural diagram of the liquid distribution connector in an embodiment of the present utility model;

[0017] Figure 4 is yet another schematic structural diagram of the liquid distribution connector in an embodiment of the present utility model;

[0018] Figure 5 is a schematic side view structural diagram of the liquid distribution connector in an embodiment of the present utility model;

[0019] Figure 6 is a schematic structural diagram of the welding groove of the liquid distribution connector in an embodiment of the present utility model;

[0020] Figure 7 is a schematic structural diagram of the flow guiding frame in an embodiment of the present utility model.

[0021] Description of the reference numerals: 1. Stack; 2. End plate; 3. Connecting plate; 301. Welding groove; 4. Liquid distribution pipe; 5. Groove; 501. Through hole; 6. Lip plate; 7. Slot; 8. Flow guide frame; 9. Limiting groove. Detailed implementation manners

[0022] The following further elaborates the present utility model in conjunction with specific embodiments, and the purpose is only to better understand the content of the present utility model. Therefore, the examples given do not limit the protection scope of the present utility model.

[0023] As Figures 1 to 5 shown, this embodiment provides a liquid flow battery liquid distribution connector, which includes a connecting plate 3 fixedly connected to the side of the stack 1. The connecting plate 3 is attached to one side of the stack 1, and a groove 5 with the same size as the electrolyte exchange port is provided corresponding to each single cell electrolyte exchange port in the stack 1. The groove 5 faces the electrolyte exchange port and is attached to the electrolyte exchange port; a liquid distribution pipe 4 is provided corresponding to each groove 5 on the connecting plate 3. One end of the liquid distribution pipe 4 is connected to the main pipeline, and the other end communicates with the groove 5; the left and right ends of the connecting plate 3 are respectively heat-sealed and welded to the left and right end plates 2, and the peripheral edges of the connecting plate 3 and the stack 1 are heat-sealed and welded with welding glue to achieve a sealing effect to prevent electrolyte leakage.

[0024] As Figure 3 、 Figure 7 , in order to make the connection between the connecting plate 3 and the single cell more firm and the sealing more tight after applying the welding glue, convex lip plates 6 are provided on the left and right sides of the connecting plate 3. A limiting groove 9 is provided on the flow guide frame 8 of the single cell corresponding to the connecting plate 3, and a slot 7 is provided corresponding to the lip plate 6. When connecting, the lip plate 6 is inserted into the corresponding slot 7 from the side. At this time, the connecting plate 3 is installed in the limiting groove 9 of the flow guide plate, and then the connecting plate 3 and the single cell are heat-sealed and welded.

[0025] As Figure 4 , in order to make the connection between the connecting plate 3 and the single cell more firm and increase the contact area when the connecting plate 3 and the single cell are heat-sealed and welded, a skirt 10 is provided on the side of the connecting plate 3 that fits the single cell.

[0026] As Figure 6 , in order to make the connection firm when the connecting plate 3 and the stack 1 are heat-sealed and welded, a welding groove 301 is provided on the side of the connecting plate 3 that fits the stack 1; during heat-sealing and welding, the welding glue is stuffed into the welding groove 301 to increase the contact area between the welding glue and the connecting plate 3.

[0027] The electrolyte exchange ports include a positive electrolyte inlet, a positive electrolyte outlet, a negative electrolyte inlet, and a negative electrolyte outlet. The positive electrolyte inlets of all single cell plates in the stack 1 share a flow battery liquid distributor connector, the negative electrolyte inlets of all single cell plates share a flow battery liquid distributor connector, the positive electrolyte outlets of all single cell plates share a flow battery liquid distributor connector, and the negative electrolyte outlets of all single cell plates share a flow battery liquid distributor connector. Taking the positive electrolyte inlet as an example, the positive electrolyte is transported to the positive electrolyte inlets of each single cell plate through the groove 5 on the flow battery liquid distributor connector, realizing multi-channel synchronous inlet and outlet of the electrolyte, making the electrolyte flow rate and velocity of each single cell plate the same, and also avoiding the internal leakage of the electrolyte between each single cell plate, improving the overall power supply and charging efficiency of the flow battery.

[0028] The above are only the preferred embodiments of the present utility model that can be implemented, and do not limit the scope of rights of the present utility model. Any equivalent changes made by using the content of the specification and drawings of the present utility model are included within the scope of rights of the present utility model.

Claims

1. A liquid flow battery liquid distribution connector, characterized in that: It includes a connecting plate (3) fixedly connected to the side of the stack (1). The connecting plate (3) is attached to one side of the stack (1), and grooves (5) are provided corresponding to the electrolyte exchange ports of each single cell in the stack (1). One liquid distribution pipe (4) is provided corresponding to each groove (5) on the connecting plate (3). One end of the liquid distribution pipe (4) is connected to the main pipeline, and the other end communicates with the groove (5).

2. The liquid flow battery liquid distribution connector according to claim 1, characterized in that: The connecting plate (3) is provided with a welding groove (301) on one side attached to the stack (1).

3. The liquid flow battery liquid distribution connector according to claim 1, wherein: The connecting plate (3) and the stack (1) are hermetically connected by welding glue.

4. The liquid flow battery liquid distribution connector according to claim 3, characterized in that: Lip plates (6) protruding outward are provided on the left and right sides of the connecting plate (3), and slots (7) corresponding to the lip plates (6) are provided on the flow guiding frame (8) of the single cell.

5. The liquid flow battery liquid distribution connector according to claim 1, wherein: The groove (5) is the same size as the electrolyte exchange port. The groove (5) faces the electrolyte exchange port and fits on the electrolyte exchange port.

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