Composite multilayer film for flow batteries

Abstract

The utility model relates to the technical field of liquid flow battery, concretely is a kind of composite multilayer film for liquid flow battery, including porous base film, both sides of porous base film are equipped with ion exchange membrane, the edge of the four around of porous base film is equipped with frame, set up two ion exchange membranes and the combination of porous base film fixed, and in the card strip and arc slot plug-in cooperation, increase the structural stability of combination, the two sides of porous base film are all matched with multiple diaphragm holes, increase the channel of ion crossing, when increasing the overall thickness, the thickness of channel reduces, the ion in electrolyte is crossed, frame is set, the protection of the four around edge of porous base film and ion exchange membrane is increased, reduce the wear and tear caused by edge and battery shell touch, set up multiple protrusions, increase the contact area of ion exchange membrane outer wall, while increase the tensile resistance of ion exchange membrane, reduce the tearing damage influence to ion exchange membrane.

Description

Technical Field

[0001] This utility model relates to the field of flow battery technology, specifically to a composite multilayer thin film for flow batteries. Background Technology

[0002] A flow battery is an electrochemical energy storage device that stores electrical energy through the flow of electrolyte. Its core feature is the decoupling of power and capacity. In this process, composite multilayer thin films play a key role in the separator of the flow battery, which are used to block the crosstalk between active materials in the positive and negative electrolytes, while allowing charge carriers such as protons to pass through to balance the charge.

[0003] However, if the composite multilayer film in a flow battery is too thin, it is prone to damage during prolonged use due to vibration and shaking, causing cross-contamination of the electrolyte on both sides of the positive and negative electrodes, thus affecting its use. If the film is too thick, it will affect the passage of ions between the positive and negative electrodes, and further increasing the thickness will further impede ion passage. Utility Model Content

[0004] The purpose of this invention is to provide a composite multilayer thin film for flow batteries to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A composite multilayer thin film for flow batteries includes a porous base membrane, with ion exchange membranes on both sides of the porous base membrane and a frame around the perimeter of the porous base membrane.

[0007] The porous base membrane has several clips on both sides, and several diaphragm holes are opened on both sides of the porous base membrane;

[0008] Several arc-shaped grooves are formed on the inner side of the ion exchange membrane at the locations corresponding to the card strips.

[0009] Furthermore, the frame is annular, and the width of the inner wall of the frame is adapted to the width of the outer wall of the porous base film.

[0010] In this invention, the frame restricts the porous base film around its perimeter, reducing wear caused by the edges touching the battery casing.

[0011] Specifically, the width of the frame is adapted to the distance between the outer walls of the two ion exchange membranes.

[0012] In this invention, two ion exchange membranes work together, and the edges of the ion exchange membranes are tightly fitted to the inner wall of the frame. The frame protects the edges of the ion exchange membranes, reducing wear and tear.

[0013] It should be noted that the card strips are evenly spaced, the card strips are semi-cylindrical, and the card strips and the porous base film are integrally formed.

[0014] In this invention, the contact area of ​​the outer surface of the porous base membrane is increased with the help of the clip, which facilitates the bonding and assembly with the ion exchange membrane.

[0015] Furthermore, the pores of the diaphragm are evenly spaced and distributed on both sides of the porous base membrane, and the depth of the pores is one-third of the thickness of the porous base membrane.

[0016] In this invention, the combination of multiple membrane pores increases the channels through which ions in the electrolyte of the liquid battery can pass, facilitating the continuous passage of ions. Furthermore, the membrane pores do not penetrate the porous base membrane, increasing the number of channels. The channels are thin, and the overall thickness is large, increasing tensile strength and reducing tearing damage caused by shaking.

[0017] It is worth noting that the inner side of the ion exchange membrane is closely fitted to the outer side of the porous base membrane, the width of the inner wall of the arc groove is adapted to the width of the outer wall of the card strip, and the card strip and the arc groove are inserted into each other.

[0018] In this invention, multiple clips are combined with arc-shaped grooves to increase the stability of the installation of the ion exchange membrane and the porous base membrane, and to increase the contact area between them.

[0019] In addition, the outer wall of the ion exchange membrane is provided with several vertical protrusions, which are distributed at equal intervals and are integrally formed with the ion exchange membrane.

[0020] In this invention, the combination of multiple protrusions increases the overall tensile strength of the ion exchange membrane and also increases the contact area of ​​the outer surface.

[0021] Compared with the prior art, the beneficial effects of this utility model are:

[0022] 1. This utility model combines and fixes two ion exchange membranes with a porous base membrane, and uses a locking strip and an arc-shaped groove for interlocking to increase the structural stability of the combination. Multiple diaphragm holes are provided on both sides of the porous base membrane to increase the channels for ion passage. As the overall thickness increases, the thickness of the channels decreases, which facilitates the passage of ions in the electrolyte. A frame is provided to increase the protection of the edges of the porous base membrane and the ion exchange membrane, and reduce the wear caused by the edges contacting the battery casing.

[0023] 2. This utility model increases the contact area of ​​the outer wall of the ion exchange membrane by setting multiple protrusions, thereby increasing the tensile strength of the ion exchange membrane and reducing the impact of tearing damage to the ion exchange membrane. Attached Figure Description

[0024] Figure 1This is a schematic diagram of the overall structure of this utility model;

[0025] Figure 2 This is a schematic diagram of the border removal structure of this utility model;

[0026] Figure 3 This is a schematic diagram of the frame structure of this utility model;

[0027] Figure 4 This is a schematic diagram of the separation structure of the porous base membrane and the ion exchange membrane of this utility model;

[0028] Figure 5 This is a schematic diagram of the porous base membrane structure of this utility model.

[0029] The meanings of the labels in the diagram are as follows:

[0030] 1. Border;

[0031] 2. Ion exchange membrane; 20. Protrusion; 21. Arc-shaped groove;

[0032] 3. Porous base membrane; 30. Card strip; 31. Diaphragm pores. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] Please see Figures 1-5 This embodiment provides a technical solution:

[0035] A composite multilayer thin film for flow batteries includes a porous base membrane 3, ion exchange membranes 2 on both sides of the porous base membrane 3, and a frame 1 around the perimeter of the porous base membrane 3.

[0036] Furthermore, the frame 1 is annular, and the width of the inner wall of the frame 1 is adapted to the width of the outer wall of the porous base film 3.

[0037] In this invention, the frame 1 restricts the porous base film 3 around its perimeter, reducing wear caused by the edges touching the battery casing.

[0038] Specifically, the width of the frame 1 is adapted to the distance between the outer walls of the two ion exchange membranes 2.

[0039] In this invention, the two ion exchange membranes 2 work together, and the edges of the ion exchange membranes 2 are tightly fitted to the inner wall of the frame 1. The frame 1 protects the edges of the ion exchange membranes 2, reducing wear and tear.

[0040] Secondly, the porous base membrane 3 has several clips 30 on both sides, and several diaphragm holes 31 are opened on both sides of the porous base membrane 3.

[0041] It should be noted that the pores 31 are evenly spaced and distributed on both sides of the porous base membrane 3. The depth of the pores 31 is one-third of the thickness of the porous base membrane 3.

[0042] In this invention, the cooperation of multiple membrane pores 31 increases the channels through which ions in the electrolyte of the liquid battery can pass, facilitating the continuous passage of ions. Furthermore, the membrane pores 31 do not penetrate the porous base membrane 3, increasing the channels and reducing the overall thickness, thus increasing tensile strength and reducing tearing damage caused by shaking.

[0043] Furthermore, several arc-shaped grooves 21 are provided on the inner side of the ion exchange membrane 2 at the locations corresponding to the card strip 30.

[0044] Among them, the card strips 30 are evenly distributed, the card strips 30 are semi-cylindrical, and the card strips 30 and the porous base membrane 3 are integrally formed.

[0045] In this invention, the contact area of ​​the outer surface of the porous base membrane 3 is increased with the cooperation of the clip 30, which facilitates the bonding and assembly with the ion exchange membrane 2.

[0046] It is worth adding that the inner side of the ion exchange membrane 2 is closely attached to the outer side of the porous base membrane 3, the width of the inner wall of the arc groove 21 is matched with the width of the outer wall of the clip 30, and the clip 30 is inserted into the arc groove 21.

[0047] In this invention, multiple clips 30 are combined with arc-shaped grooves 21 to increase the stability of the installation of ion exchange membrane 2 and porous base membrane 3 and increase the contact area between them.

[0048] Furthermore, the outer wall of the ion exchange membrane 2 is provided with several vertical protrusions 20, which are distributed at equal intervals and are integrally formed with the ion exchange membrane 2.

[0049] In this invention, the combination of multiple protrusions 20 increases the overall tensile strength of the ion exchange membrane 2 and increases the contact area of ​​the outer surface.

[0050] In this embodiment, the composite multilayer film for flow batteries is first used by inserting the porous base membrane 3 with multiple membrane holes 31 into the arc groove 21 on the ion exchange membrane 2 through multiple clips 30. Both the porous base membrane 3 and the ion exchange membrane 2 are installed inside the frame 1. The frame 1 protects the outer walls of the porous base membrane 3 and the ion exchange membrane 2, reducing the impact of contact wear with the inner wall of the battery casing.

[0051] With the cooperation of multiple protrusions 20, the tensile strength of the ion exchange membrane 2 is increased. The whole is installed inside the battery case, separating the positive and negative electrode compartments. The electrolyte is added into the battery case, and the corresponding ions pass through the membrane pores 31 on the ion exchange membrane 2 and the porous base membrane 3 in sequence. The ions move to the corresponding electrodes. The overall assembly is convenient to install. While increasing the overall thickness, it does not affect the rapid penetration of ions. It also reduces the tearing of the ion exchange membrane 2 and the porous base membrane 3 caused by bumps and shaking inside the battery case after installation, thus reducing the overall service life.

Claims

1. A composite multilayer thin film for flow batteries, comprising a porous base film (3), characterized in that: The porous base membrane (3) has ion exchange membranes (2) on both sides, and the porous base membrane (3) has a frame (1) around its perimeter. The porous base membrane (3) has several clips (30) on both sides, and several diaphragm holes (31) are opened on both sides of the porous base membrane (3). Several arc-shaped grooves (21) are provided on the inner side of the ion exchange membrane (2) at the position corresponding to the card strip (30).

2. The composite multilayer thin film for flow batteries according to claim 1, characterized in that: The frame (1) is annular, and the width of the inner wall of the frame (1) is adapted to the width of the outer wall of the porous base film (3).

3. The composite multilayer thin film for flow batteries according to claim 1, characterized in that: The width of the frame (1) is adapted to the distance between the outer walls of the two ion exchange membranes (2).

4. The composite multilayer thin film for flow batteries according to claim 1, characterized in that: The card strips (30) are evenly spaced and are semi-cylindrical. The card strips (30) and the porous base membrane (3) are integrally formed.

5. The composite multilayer thin film for flow batteries according to claim 1, characterized in that: The pores (31) of the diaphragm are evenly spaced and distributed on both sides of the porous base membrane (3). The depth of the pores (31) is one-third of the thickness of the porous base membrane (3).

6. The composite multilayer thin film for flow batteries according to claim 1, characterized in that: The inner side of the ion exchange membrane (2) is closely attached to the outer side of the porous base membrane (3), the width of the inner wall of the arc groove (21) is adapted to the width of the outer wall of the card strip (30), and the card strip (30) is inserted into the arc groove (21).

7. The composite multilayer thin film for flow batteries according to claim 1, characterized in that: The outer wall of the ion exchange membrane (2) is provided with a number of vertical protrusions (20), the protrusions (20) are distributed at equal intervals, and the protrusions (20) and the ion exchange membrane (2) are integrally formed.

Images