Lateral liquid inlet liquid flow frame

Abstract

The utility model relates to the technical field of flow batteries, in particular to a side liquid inlet flow frame, which comprises a plate body, a rectangular through hole for accommodating a porous electrode is arranged in the middle of the plate body, and electrolyte flow channels communicated with the rectangular through hole are respectively arranged on the upper side and the lower side of the rectangular through hole on the plate surface on one side of the plate body; a plurality of liquid flow holes are formed in the side edge of the plate body, the plurality of liquid flow holes are divided into two groups, and the two groups of liquid flow holes are respectively communicated with the two electrolyte flow channels; by forming the liquid flow holes in the side edge of the plate body, electrolyte can enter or flow out from the side edge of the liquid flow frame, the electrolyte of each electrode in the galvanic pile can form independent circulation and does not influence each other, the electrolyte flow and flow velocity of each electrode in the galvanic pile are the same, the problem that the electrolyte flow of each electrode in the galvanic pile is not uniform is avoided, and the service life of the galvanic pile is prolonged. 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 specifically relates to a side-inlet flow frame. Background Art

[0002] A flow battery is a new type of storage battery based on electrochemical energy storage technology, which consists of a stack unit, an electrolyte, an electrolyte storage tank, etc.; among them, the stack unit is the core component of the flow battery, and the core component in the stack unit is the flow frame. The flow frame is the necessary flow domain for introducing the electrolyte into multiple electrodes. Therefore, the design of the flow channels in the flow frame is very important.

[0003] For example, the flow battery structure for testing in the existing patent CN220272519U and the flow frame and vanadium battery in the patent CN213184362U. In the prior art, most of the flow frames in the existing stack units are provided with through holes perpendicular to the plate surface of the flow frame, and grooves communicating with the through holes are provided on the plate surface of the flow frame as electrolyte flow channels. The through holes on several flow frames are connected in series to form a channel, and the positive electrode liquid pipeline or the negative electrode liquid pipeline is communicated with the channel. The electrode liquid is distributed to the electrolyte flow channels of each flow frame through the channel, providing positive electrode liquid or negative electrode liquid for each stack unit.

[0004] Using the flow frame structure in the prior art, the electrolyte flow rate and velocity of the flow frame where the through hole near the positive electrode liquid pipeline or the negative electrode liquid pipeline is located are different from those of the flow frame where the through hole far from the positive electrode liquid pipeline or the negative electrode liquid pipeline is located. The electrolyte pressure received by each single cell is different, which will further lead to uneven electrolyte flow in each single cell in the stack, reducing the overall power supply and charging efficiency of the flow battery. Summary of the Utility Model

[0005] Aiming at the deficiencies of the prior art, the purpose of the present utility model is to provide a side-inlet flow frame that can introduce liquid from the side of the flow frame, realize the independent inflow and outflow of electrolyte for each single cell, and avoid the problem of uneven electrolyte flow in each single cell in the stack.

[0006] The technical solution adopted by the present utility model to solve its technical problems is:

[0007] A side-inlet flow frame includes a plate body. A rectangular through hole for accommodating a porous electrode is provided in the middle of the plate body. On one side of the plate body, an electrolyte flow channel communicating with the rectangular through hole is provided on each of the upper and lower sides of the rectangular through hole; a plurality of liquid flow holes are provided on the side edge of the plate body. The plurality of liquid flow holes are divided into two groups, and the two groups of liquid flow holes are respectively communicated with the two electrolyte flow channels.

[0008] The present utility model adopting the above technical solution, compared with the prior art, its prominent feature is:

[0009] By opening liquid flow holes on the side of the plate body, the electrolyte can enter or flow out from the side of the liquid flow frame, so that the electrolyte of each electrode in the battery stack can form an independent circulation without affecting each other. The electrolyte flow rate and flow velocity of each electrode in the battery stack are the same, which avoids the problem of uneven electrolyte flow of each electrode in the battery stack and improves the overall power supply and charging efficiency of the liquid flow battery; at the same time, it greatly avoids the existing patent in which a through hole is opened on the plate surface perpendicular to the liquid flow frame, and the through holes on several liquid flow frames are connected in series to form a channel. Once a blockage occurs, the entire battery stack is damaged, and the mutual influence of the electrodes in the battery stack is avoided.

[0010] As a preferred embodiment, a further technical solution of the utility model is:

[0011] Preferably, it also includes a built-in flow channel arranged in the plate body, and the liquid flow hole is connected with the electrolyte flow channel through the built-in flow channel; by setting the built-in flow channel, it is avoided to make grooves on the side of the plate body, and the liquid flow hole and the electrolyte flow channel are connected; thereby avoiding the problem of being unable to fill the grooves with glue, and the occurrence of breakpoints when bonding the liquid flow frame and the diaphragms and bipolar plates on both sides thereof, avoiding the problem of electrolyte leakage and seepage, and the bonding area between the liquid flow frame and the diaphragms and bipolar plates on both sides thereof is larger and stronger.

[0012] Preferably, glue grooves are provided on both sides of the plate body, and the glue grooves are located near the edge of the plate body and are arranged along the circumference of the plate body.

[0013] Preferably, a support protrusion is provided in the electrolyte flow channel, and the surface of the support protrusion is flush with the surface of the plate body; the support protrusion can play a supporting role to prevent the electrolyte flow channel from being collapsed due to uneven electrolyte flow in the liquid flow frames on both sides of the diaphragm after the battery stack is assembled.

[0014] Preferably, the supporting protrusion has a parallelepiped structure.

[0015] Preferably, the supporting protrusion is arranged centered on the electrolyte flow channel in the width direction.

[0016] Preferably, the support protrusion has two side edges parallel to the electrolyte flow channel; a guide channel is formed between the two side edges of the support protrusion parallel to the electrolyte flow channel and the side walls of the electrolyte flow channel; when the electrode liquid flows through the support protrusion, the support protrusion guides the electrolyte, and when the electrolyte flows into the guide channel, the liquid pressure increases, which facilitates the backward flow of the electrolyte.

[0017] Preferably, the two vertex angles at the left and right ends of the supporting protrusion are 30°-60°; when the electrolyte flows from the electrolyte flow channel to the guide channel, the 30°-60° angle has a good transition effect and avoids obstruction of the electrolyte flow.

[0018] Preferably, the supporting protrusion has a length of 30 mm to 100 mm and a width of 2 mm to 10 mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of the side liquid inlet liquid flow frame in the embodiment of the present utility model;

[0020] Figure 2 It is a schematic plan view of the side liquid inlet liquid flow frame in the embodiment of the present utility model;

[0021] Figure 3 is Figure 2 The schematic cross-sectional structure diagram at A-A in

[0022] Figure 4 is Figure 3 The enlarged structural diagram at B in

[0023] Figure 5 It is a schematic left view of the side liquid inlet liquid flow frame in the embodiment of the present utility model;

[0024] Figure 6 It is another schematic structural diagram of the side liquid inlet liquid flow frame in the embodiment of the present utility model;

[0025] Figure 7 It is a schematic three-dimensional structure diagram of the side liquid inlet liquid flow frame in the embodiment of the present utility model.

[0026] Explanation of reference numerals: 1. Plate body; 2. Rectangular through hole; 3. Electrolyte flow channel; 4. Liquid flow hole; 5. Support bump; 6. Built-in flow channel; 7. Glue groove. Specific embodiments

[0027] The present utility model will be further described below in conjunction with specific embodiments. 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.

[0028] As Figure 1 , Figure 2 shown, this embodiment provides a side liquid inlet liquid flow frame, including a plate body 1. A rectangular through hole 2 for accommodating a porous electrode is provided in the middle of the plate body 1. On one side surface of the plate body 1, an electrolyte flow channel 3 communicating with the rectangular through hole 2 is provided on each of the upper and lower sides of the rectangular through hole 2; a plurality of liquid flow holes 4 are provided on the side edge of the plate body 1. As Figure 5 shown, the plurality of liquid flow holes 4 are divided into two groups, and the two groups of liquid flow holes 4 are respectively connected to the two electrolyte flow channels 3; one of the electrolyte flow channels 3 and its corresponding group of liquid flow holes 4 are used for electrolyte inlet, and the other electrolyte flow channel 3 and its corresponding group of liquid flow holes 4 are used for electrolyte outlet.

[0029] By opening the liquid flow hole 4 on the side of the plate body 1, the electrolyte can enter or flow out from the side of the liquid flow frame, so that the electrolyte of each electrode in the battery stack can form an independent circulation without affecting each other. The electrolyte flow rate and flow velocity of each electrode in the battery stack are the same, avoiding the problem of uneven electrolyte flow of each electrode in the battery stack, and improving the overall power supply and charging efficiency of the liquid flow battery.

[0030] like Figure 3 , 4 As shown, it also includes a built-in flow channel 6 arranged in the plate body 1, and the liquid flow hole 4 is connected with the electrolyte flow channel 3 through the built-in flow channel 6; by setting the built-in flow channel 6, it is avoided to open a groove on the side of the plate body 1 to connect the liquid flow hole 4 and the electrolyte flow channel 3; the bonding area between the liquid flow frame and the diaphragm and bipolar plate on both sides thereof is increased.

[0031] like Figure 6 As shown, glue grooves 7 can also be provided on both sides of the plate body 1. The glue grooves 7 are located near the edge of the plate body 1 and are arranged circumferentially along the plate body 1. When connecting and fixing, hot melt adhesive is added into the glue grooves 7, and the liquid flow frame and the diaphragms and bipolar plates on both sides thereof are hot-melt welded and connected by the hot melt adhesive. By providing the built-in flow channel 6, it is avoided that grooves are opened on the side of the plate body 1 to connect the liquid flow holes 4 and the electrolyte flow channels 3, and it is avoided that the grooves cannot be filled with glue, and the problems of electrolyte leakage and seepage are avoided, thereby improving the stack packaging effect.

[0032] In practice, a support convex block 5 is provided in the electrolyte flow channel 3, and the support convex block 5 is in a parallelepiped structure, and the surface of the support convex block 5 is flush with the surface of the plate body 1; Figure 1 , Figure 2 As shown, a plurality of support protrusions 5 can be arranged at intervals in each electrolyte flow channel 3. Figure 6 , Figure 7 As shown, only one supporting protrusion 5 is provided in each electrolyte flow channel 3, and is located on one side of the electrolyte flow channel 3 close to the liquid flow hole 4; specifically, the supporting protrusion 5 is arranged in the center of the electrolyte flow channel 3 in the width direction; the length of the supporting protrusion 5 is 30mm-100mm and the width is 2mm-10mm.

[0033] The support protrusion 5 has two side edges arranged parallel to the electrolyte flow channel 3; a guide channel is formed between the two side edges and the side walls of the electrolyte flow channel 3. When the electrode liquid flows through the support protrusion 5, the support protrusion 5 has a guiding effect on the electrolyte. When the electrolyte flows from the electrolyte flow channel 3 with a larger width to the guide channel with a smaller width, the liquid pressure increases, which accelerates the electrolyte flow rate, strengthens the mass transfer inside the battery stack unit, and increases the reaction rate.

[0034] In order to facilitate the electrolyte to flow smoothly from the electrolyte flow channel 3 to the guide channel, the two vertex angles at the left and right ends of the support protrusion 5 are 30°-60°.

[0035] The above are only the preferred embodiments of the present utility model that can be implemented, and thus 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 side-inlet liquid flow frame, comprising a plate body (1), wherein a rectangular through-hole (2) for accommodating a porous electrode is provided in the middle of the plate body (1), and is characterized in that: On one side of the plate body (1), an electrolyte flow channel (3) communicating with the rectangular through-hole (2) is arranged on each of the upper and lower sides of the rectangular through-hole (2); a plurality of liquid flow holes (4) are arranged on the side edge of the plate body (1), and the plurality of liquid flow holes (4) are divided into two groups, and the two groups of liquid flow holes (4) are respectively communicated with the two electrolyte flow channels (3).

2. The side liquid inlet liquid flow frame according to claim 1, characterized in that: It further includes an internal flow channel (6) arranged in the plate body (1), and the liquid flow hole (4) is communicated with the electrolyte flow channel (3) through the internal flow channel (6).

3. The side inlet liquid flow frame according to claim 2, characterized in that: Glue grooves (7) are arranged on the front and back sides of the plate body (1), and the glue grooves (7) are arranged along the circumferential direction of the plate body (1) near the edge of the plate body (1).

4. The side inlet liquid flow frame according to claim 1, characterized in that: Support bumps (5) are arranged in the electrolyte flow channel (3), and the surface of the support bumps (5) is flush with the surface of the plate body (1).

5. The side inlet liquid flow frame according to claim 4, characterized in that: The support bump (5) has a parallel hexagonal structure.

6. The side inlet liquid flow frame according to claim 5, characterized in that: The support bump (5) is arranged in the middle of the electrolyte flow channel (3) in the width direction.

7. The side inlet liquid flow frame according to claim 6, wherein: Two side edges of the support bump (5) are parallel to the electrolyte flow channel (3); diversion channels are formed between the two side edges of the support bump (5) parallel to the electrolyte flow channel (3) and the side walls of the electrolyte flow channel (3).

8. The side liquid inlet liquid flow frame according to claim 7, characterized in that: The two top angles at the left and right ends of the support bump (5) are 30°-60° angles.

9. The side liquid inlet liquid flow frame according to claim 6, characterized in that: The length of the support bump (5) is 30 mm - 100 mm, and the width is 2 mm - 10 mm.

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