Liquid separator of flow battery

Abstract

The utility model relates to the technical field of flow batteries, in particular to a flow battery liquid separator, N single battery pieces are arranged in an electric pile of a flow battery, the flow battery liquid separator comprises a shell, one end of the shell is provided with a main connector used for being connected with a main pipeline, and the other end of the shell is sealed; n groups of through holes are formed in the shell, each group comprises two through holes, and the through holes are formed in the upper side and the lower side of the shell respectively; the lower side through hole is provided with a pipe joint used for being connected with a liquid separation branch pipe, the upper side through hole is provided with a flow adjusting valve, and the flow adjusting valve and the pipe joint are arranged in a one-to-one correspondence mode; according to the flow battery liquid separator, the problems that liquid is fed through a single-side end plate and the flow of electrolyte in a galvanic pile is uneven in the prior art are solved, synchronous conveying of the electrolyte through the N liquid separation branch pipes is achieved, the N single battery pieces of the galvanic pile independently carry out electrolyte feeding or discharging work, the flow and the flow speed of the electrolyte of each single battery piece are the same, and the flow rate of the electrolyte in the galvanic pile is uniform. 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 liquid flow batteries, in particular to a liquid flow battery distributor. Background Art

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

[0003] In the prior art, such as a flow battery stack structure with application number CN202111489661.1, each stack includes two left and right end plates, and a plurality of single cells are arranged between the two end plates from left to right through bipolar plates, and each single cell includes a positive electrode located in a through hole in the middle of a positive electrode frame, an ion conductive membrane, and a negative electrode located in a through hole in the middle of a negative electrode frame, which are stacked in sequence from left to right; N through holes as the inlet of a positive electrolyte and N through holes as the outlet of a positive electrolyte are respectively opened at corresponding positions on the left end plate and the bipolar plate. , N through holes as the inlet of the negative electrode electrolyte, and N through holes as the outlet of the negative electrode electrolyte, through the through holes connected in series to form channels, so that the positive and negative electrode electrolytes enter and exit each single battery through the channels; in the prior art, a main pipeline and a main valve are used to supply liquid to all the single battery cells in the battery stack. The single battery cells close to the main valve and the single battery cells far from the main valve are subjected to different electrolyte pressures, and the electrolyte flow rate and flow velocity will also be different, which will lead to uneven electrolyte flow in the battery stack, reducing the overall power supply and charging efficiency of the liquid flow battery. Utility Model Content

[0004] In view of the deficiencies of the prior art, the purpose of the utility model is to provide a liquid flow battery separator that can ensure that the electrolyte flow rate and flow rate of all single battery cells in the battery stack are the same during the power supply and charging process.

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

[0006] A liquid flow battery distributor, wherein N single battery sheets are arranged in a liquid flow battery stack, and the distributor comprises a shell, one end of the shell is provided with a main joint for connecting to a main pipeline, and the other end is sealed; the shell is provided with N groups of through holes, two in each group, respectively arranged on the upper and lower sides of the shell; a pipe joint for connecting to a liquid distribution branch pipe is arranged on the lower through hole, and a flow regulating valve is arranged on the upper through hole, and the flow regulating valve and the pipe joint are arranged in a one-to-one correspondence.

[0007] Compared with the prior art, the utility model adopting the above technical solution has the following outstanding features:

[0008] The liquid flow battery separator solves the problem of uneven electrolyte flow in the battery stack due to liquid inlet from a single-side end plate in the prior art. Each pipe joint corresponds to a liquid separation branch pipe, and each liquid separation branch pipe corresponds to the liquid inlet or outlet of a single battery cell, so that N liquid separation branches can synchronously transport electrolyte, and N single battery cells in the battery stack can independently carry out electrolyte inlet or outlet work. The electrolyte flow rate and flow velocity of each single battery cell are the same, and internal electrolyte cross-talk between single battery cells is avoided, thereby improving the overall power supply and charging efficiency of the liquid flow battery.

[0009] As a preferred embodiment, a further technical solution of the utility model is:

[0010] Preferably, the flow regulating valve includes an externally threaded sleeve, which is externally connected to the upper through hole, and an adjusting cap is threadedly connected to the externally threaded sleeve. An adjusting rod is provided in the adjusting cap, and the adjusting rod extends from the adjusting cap to the lower through hole. A conical head is provided at the lower end of the adjusting rod, and the tip of the conical head points downward. The liquid flow at the pipe joint decreases as the conical head is extended. The structure is simple and the adjustment is convenient.

[0011] Preferably, an indicator line is provided on the external threaded sleeve, and an annular scale mark is provided on the adjusting cap; during adjustment, the flow at all pipe joints is ensured to be consistent by observing the position of the indicator line on the annular scale mark.

[0012] Preferably, a limiting ring is provided on the adjusting rod, and a limiting groove is provided on the adjusting cap corresponding to the limiting ring, and the adjusting rod is rotatably connected in the limiting groove through the limiting ring; this avoids damage to the adjusting rod due to the large friction between the conical head and the pipe joint when the adjusting cap is rotated.

[0013] Preferably, a connector is also included, the connector includes a connecting plate fixedly connected to the side of the battery stack, the connecting plate is attached to one side of the battery stack and is provided with N grooves, the N grooves respectively correspond to the electrolyte exchange ports in the N single battery cells; a connecting tube is provided on the connecting plate corresponding to each groove, one end of the connecting tube is connected to a pipe joint through a liquid separation branch pipe, and the other end is connected to the groove; the connection between the liquid flow battery separator and each single battery cell in the battery stack is achieved through the connector.

[0014] Preferably, the size of the groove is the same as that of the electrolyte exchange port and is arranged close to the electrolyte exchange port.

[0015] Preferably, the connecting plate and the battery stack are sealed and connected by a sealant; the connection has good sealing performance and can prevent leakage of the electrolyte.

[0016] Preferably, a glue filling groove is provided on one side of the connecting plate that is attached to the fuel cell stack; by providing the glue filling groove, the contact area between the connecting plate and the sealant is increased, making the sealing connection between the connecting plate and the fuel cell stack more secure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a liquid flow battery separator in an embodiment of the utility model;

[0018] Figure 2 It is a schematic cross-sectional view of the structure of the liquid flow battery separator in the embodiment of the utility model;

[0019] Figure 3 This is a schematic diagram of the connection structure between the connector and the battery stack in the embodiment of the utility model;

[0020] Figure 4 It is a schematic diagram of the structure of the connector in the embodiment of the utility model;

[0021] Figure 5 It is a schematic diagram of the overall structure when the liquid distributor in the embodiment of the utility model is connected to the battery stack power supply system;

[0022] Figure 6 It is a schematic diagram of the connection structure between the liquid dispenser and the connector in the embodiment of the utility model;

[0023] Figure 7 It is a structural schematic diagram of the glue filling groove in the embodiment of the utility model.

[0024] Explanation of the reference numerals: 1. Shell; 2. Main joint; 3. Pipe joint; 4. Flow regulating valve; 401. Externally threaded sleeve; 402. Adjusting cap; 403. Adjusting rod; 404. Conical head; 5. Connecting plate; 501. Glue filling groove; 6. Connecting pipe; 7. Groove; 8. Battery stack; 9. Positive electrode electrolyte storage barrel; 10. Negative electrode electrolyte storage barrel; 11. Infusion pump; 12. Liquid distribution branch pipe; 13. Liquid outlet pipe; 14. Liquid inlet pipe. DETAILED DESCRIPTION

[0025] The present invention is further described below in conjunction with specific embodiments, the purpose of which is only to provide a better understanding of the content of the present invention. Therefore, the examples given do not limit the protection scope of the present invention.

[0026] like Figure 1 As shown, this embodiment provides a liquid flow battery separator, in which N single battery sheets are arranged in the battery stack 8 of the liquid flow battery, including a shell 1, one end of the shell 1 is provided with a main joint 2 for connecting to the main pipeline, and the other end is sealed; N groups of through holes are arranged on the shell 1, two in each group, and are respectively arranged on the upper and lower sides of the shell 1; a pipe joint 3 for connecting to the liquid separation branch pipe 12 is arranged on the lower through hole, and the model of the pipe joint 3 is selected according to the liquid separation branch pipe 12 to be installed; a flow regulating valve 4 is arranged on the upper through hole, and the flow regulating valve 4 is arranged one by one with the pipe joint 3, so as to adjust the liquid flow at the pipe joint 3.

[0027] like Figure 2As shown, the flow regulating valve 4 includes an externally threaded sleeve 401, which is externally connected to the upper through hole, and an adjusting cap 402 is threadedly connected to the externally threaded sleeve 401. An adjusting rod 403 is arranged in the adjusting cap, and the adjusting rod 403 extends from the adjusting cap to the lower through hole. A conical head 404 is arranged at the lower end of the adjusting rod 403, and the tip of the conical head 404 faces downward.

[0028] When in use, rotate the adjusting cap to drive the adjusting cap to move up and down along the through hole. When the conical head 404 is located on the upper side of the lower through hole and is not in contact with the lower through hole, the pipe joint 3 is at the maximum flow rate. The liquid flow rate at the pipe joint 3 gradually decreases as the conical head 404 gradually extends into the lower through hole. When the conical surface of the conical head 404 is pressed tightly against the lower through hole, the pipe joint 3 is in a closed state.

[0029] In order to prevent the electrolyte from leaking from the flow regulating valve 4, the regulating rod 403 is rotatably sealed and connected to the through hole on the upper side of the housing 1 via a sealing ring.

[0030] In order to facilitate the adjustment of the flow rates at all three pipe joints to be consistent, an indicator line is provided on the external threaded sleeve 401 and an annular scale mark is provided on the adjusting cap; when the adjusting cap is rotated, the flow rate at the pipe joint 3 is confirmed by observing the position of the indicator line on the annular scale mark.

[0031] Since the adjusting rod 403 is in the shape of a long strip, in order to avoid the situation where the upper and lower ends of the adjusting rod 403 are subjected to a large reverse force due to the large friction between the conical head 404 and the pipe joint 3 when the adjusting cap is rotated, thereby causing the adjusting rod 403 to be twisted off, in this embodiment, a limiting ring is provided on the adjusting rod 403, and a limiting groove is provided on the adjusting cap corresponding to the limiting ring, and the adjusting rod 403 is rotatably connected in the limiting groove through the limiting ring.

[0032] like Figure 3 , Figure 4 As shown, it also includes a connector, which includes a connecting plate 5 fixedly connected to the side of the battery stack 8, and the connecting plate 5 is fitted on one side of the battery stack 8 and is provided with N grooves 7, and the N grooves 7 are respectively provided corresponding to the electrolyte exchange ports in the N single battery sheets; a connecting tube 6 is provided on the connecting plate 5 corresponding to each groove 7, and one end of the connecting tube 6 is connected to the connecting tube 6 joint through the liquid separation branch pipe 12, and the other end is connected to the groove 7; the connection between the liquid flow battery separator and each single battery sheet in the battery stack 8 is realized through the connector. Among them, the size of the groove 7 is the same as the electrolyte exchange port and is provided close to the electrolyte exchange port.

[0033] like Figure 3 , Figure 5 , Figure 6As shown, the electrolyte exchange port includes a positive electrolyte inlet, a positive electrolyte outlet, a negative electrolyte inlet, and a negative electrolyte outlet. The positive electrolyte inlets of N single cells in the battery stack 81 share a liquid flow battery separation connector, the negative electrolyte inlets of N single cells share a liquid flow battery separation connector, the positive electrolyte outlets of N single cells share a liquid flow battery separation connector, and the negative electrolyte outlets of N single cells share a liquid flow battery separation connector.

[0034] The connecting plate 5 is sealed and connected to the battery stack 8 by a sealant; a glue filling groove 501 is provided on one side of the connecting plate 5 that is attached to the battery stack 8. Figure 7 The glue filling groove 501 is arranged outside the groove 7; by setting the glue filling groove 501, the contact area between the connecting plate 5 and the sealant is increased, so that the sealing connection between the connecting plate 5 and the battery stack 8 is more firmly established.

[0035] like Figure 4 The side cross-section of the connecting plate 5 is convex-shaped, and the bottom surface is in contact with the battery stack 8, which increases the contact area between the connecting plate 5 and the sealant, making the connection between the connecting plate 5 and the battery stack 8 more firmly.

[0036] When using, Figure 5 , Figure 6 As shown, the flow battery system includes a battery stack 8, a positive electrolyte storage barrel 9, a negative electrolyte storage barrel 10 and an infusion pump 11. The positive electrolyte storage barrel 9 stores positive electrolyte, and the negative electrolyte storage barrel 10 stores negative electrolyte. The battery stack 8 is sealed and connected to four connectors on the side, corresponding to N positive electrolyte inlets, N positive electrolyte outlets, N negative electrolyte inlets, and N negative electrolyte outlets respectively; the connectors are connected through the liquid branch pipe 12 Connect the dispenser; the positive electrolyte or the negative electrolyte is transported to the main connector 2 of the flow battery dispenser through the infusion pump 11, and the electrolyte is output at the same flow rate through N pipe connectors 3, and is input into the connector through the liquid distribution branch pipe 12, and is input into the positive electrolyte inlet or the negative electrolyte inlet through the grooves 7 of the connector; when discharging the liquid, the working principle is the same, and the positive electrolyte outlet or the negative electrolyte outlet is output to the connector, and flows back to the corresponding storage bucket through the liquid distribution branch pipe 12 and the dispenser.

[0037] The utility model solves the problem of uneven electrolyte flow in the battery stack 8. Each pipe joint 3 corresponds to a liquid distribution branch pipe 12, and each liquid distribution branch pipe 12 corresponds to the liquid inlet or liquid outlet of a single battery cell. The N liquid distribution branch pipes 12 can transport electrolyte synchronously and at the same flow rate. The N single battery cells of the battery stack 8 independently carry out electrolyte inlet or outlet operations, thereby improving the overall power supply and charging efficiency of the liquid flow battery.

[0038] The above description is only the preferred embodiment of the present invention, and does not limit the scope of rights of the present invention. All equivalent changes made using the contents of the present invention specification and its drawings are included in the scope of rights of the present invention.

Claims

1. A liquid flow battery separator, wherein a liquid flow battery stack (8) is provided with N single battery sheets, characterized in that: The invention comprises a shell (1), one end of the shell (1) is provided with a main joint (2) for connecting to a main pipeline, and the other end is sealed; the shell (1) is provided with N groups of through holes, each group of two, which are respectively provided on the upper and lower sides of the shell (1); the lower through hole is provided with a pipe joint (3) for connecting to a liquid distribution branch pipe (12), and the upper through hole is provided with a flow regulating valve (4), and the flow regulating valve (4) and the pipe joint (3) are provided in a one-to-one correspondence.

2. The liquid flow battery separator according to claim 1, characterized in that: The flow regulating valve (4) comprises an externally threaded sleeve (401), the externally threaded sleeve (401) being externally connected to the upper through hole, an adjusting cap (402) being threadedly connected to the externally threaded sleeve (401), an adjusting rod (403) being arranged in the adjusting cap, the adjusting rod (403) extending from the adjusting cap to the lower through hole, a conical head (404) being arranged at the lower end of the adjusting rod (403), the tip of the conical head (404) being downwardly pointed, and the flow of liquid at the pipe joint (3) being reduced as the conical head (404) is extended.

3. The liquid flow battery separator according to claim 2, characterized in that: An indicator mark is provided on the external threaded sleeve (401), and an annular scale mark is provided on the adjusting cap.

4. The liquid flow battery separator according to claim 2, characterized in that: A limit ring is provided on the adjusting rod (403), a limit groove is provided on the adjusting cap corresponding to the limit ring, and the adjusting rod (403) is rotatably connected in the limit groove via the limit ring.

5. The liquid flow battery separator according to claim 1, characterized in that: The invention also comprises a connector, the connector comprising a connecting plate (5) fixedly connected to the side of the battery stack (8), the connecting plate (5) being fitted on one side of the battery stack (8) and provided with N grooves (7), the N grooves (7) respectively corresponding to the electrolyte exchange ports in the N single battery sheets; a connecting tube (6) is provided on the connecting plate (5) corresponding to each groove (7), one end of the connecting tube (6) is connected to the connecting tube (6) through the liquid separation branch tube (12), and the other end is connected to the groove (7).

6. The liquid flow battery separator according to claim 5, characterized in that: The size of the groove (7) is the same as that of the electrolyte exchange port and is arranged closely to the electrolyte exchange port.

7. The liquid flow battery separator according to claim 5, characterized in that: The connecting plate (5) is sealed and connected to the battery stack (8) by means of a sealant.

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