Gas-liquid separator for battery assembly

Abstract

The utility model discloses a gas-liquid separator for a battery assembly, which belongs to the technical field of battery assemblies and comprises a shell, a first channel and a second channel which are communicated with each other are formed in the shell, and the first channel extends in the height direction; the separation membrane is arranged at one end of the first channel and is suitable for gas to pass through; wherein the second channel is arranged between the separation membrane and the other end of the first channel, and the electrolyte is suitable for entering from the second channel and being discharged from the other end of the first channel. According to the gas-liquid separator designed by the utility model, gas-liquid separation can be carried out when electrolyte mixed with hydrogen enters the first channel, and media such as water carried by the hydrogen are blocked by the separation membrane, so that the media such as the water are prevented from being taken away when the hydrogen is discharged, and the electrical performance index of a single battery is improved, so that the electrical performance index of an aluminum alkali liquor flow battery assembly is improved; meanwhile, the gas-liquid separator is simple in structure, small in size, simple in manufacturing process and high in installation efficiency.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery components, and in particular relates to a gas-liquid separator used for a battery component. Background Art

[0002] In the related technology, in the aluminum-alkali liquid flow battery assembly, the chemical discharge formula is 4Al+3O2+6H2O+4KOH=4KAl(OH)4. In the prior art, it is accompanied by side reactions, and the reaction formula is: 2Al+6H2O=2Al(OH)3↓+3H2↑. The side reactions will produce hydrogen. When the hydrogen separates from the electrolyte and leaves the circulation, it will take away some water and other media. The loss of these media will cause the electrical performance indicators of the small-power aluminum-alkali liquid flow battery assembly to decrease. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to propose a gas-liquid separator for a battery assembly. According to the gas-liquid separator for a battery assembly designed by the utility model, the electrolyte mixed with hydrogen can be separated into gas and liquid when entering the first channel, and the water and other media carried by the hydrogen are blocked by the separation membrane, so as to avoid the water and other media being taken away when the hydrogen is discharged, thereby improving the electrical performance indicators of the battery cell, thereby improving the electrical performance indicators of the aluminum alkaline liquid flow battery assembly. At the same time, the gas-liquid separator of the present application has a simple structure and a compact size, and the manufacturing process of the gas-liquid separator is simple and the installation efficiency is high.

[0004] In order to achieve the above object, the utility model provides the following technical solutions:

[0005] The utility model provides a gas-liquid separator for a battery assembly, comprising: a shell, a first channel and a second channel connected to each other are formed in the shell, and the first channel extends in the height direction; a separation membrane, the separation membrane is arranged at one end of the first channel, and the separation membrane is suitable for gas to pass through; wherein the second channel is arranged between the separation membrane and the other end of the first channel, and the electrolyte is suitable for entering from the second channel and being discharged from the other end of the first channel.

[0006] According to the gas-liquid separator for battery assemblies of the utility model, a separation membrane is arranged at one end of the first channel, and the second channel is located between the separation membrane and the other end of the first channel, so that gas-liquid separation is achieved when the electrolyte mixed with hydrogen enters the first channel through the second channel, and the water and other media carried by the hydrogen can be blocked by the separation membrane, so that the hydrogen is prevented from taking away the water and other media during the discharge process, thereby improving the electrical performance indicators of the battery cells, thereby improving the discharge efficiency of the aluminum-alkali liquid flow battery assembly. At the same time, the gas-liquid separator of the present application has a simple structure, a small size and a low cost, which reduces the production cost and manufacturing difficulty of the aluminum-alkali liquid flow battery assembly, and facilitates the installation of the gas-liquid separator, thereby improving the assembly efficiency of the aluminum-alkali liquid flow battery assembly.

[0007] Furthermore, the shell includes: a first pipe, in which the first channel is formed; and a second pipe, which is connected to the first pipe and in which the second channel is formed.

[0008] Furthermore, the shell also includes: an end cover, on which a through hole is formed that penetrates in the thickness direction, and on which a first connecting portion and a second connecting portion are provided, wherein the first connecting portion is suitable for connecting to the separation membrane, and the second connecting portion is suitable for connecting to the first pipeline.

[0009] Furthermore, the outer circumferential wall of the separation membrane is provided with a third connection part, the inner circumferential wall of the end cover is provided with a first connection part, and the first connection part is detachably matched with the third connection part; the inner circumferential wall of the first pipe is provided with a fourth connection part, and the outer circumferential wall of the end cover is provided with a second connection part, and the second connection part is detachably matched with the fourth connection part.

[0010] Furthermore, an operating ear is provided on the end cover, and two ends of the operating ear are respectively connected to two ends of the end cover in the radial direction.

[0011] Furthermore, it also includes: a temperature sensor, which is connected to the second pipe and is suitable for detecting the temperature of the electrolyte in the second channel.

[0012] Furthermore, the second pipeline includes: a first split part, one end of which is connected to the first pipeline, and the temperature sensor is arranged on the first split part; a second split part, which is connected to the other end of the first split part, and is suitable for cooperating with the pipeline.

[0013] Furthermore, a sealing protrusion is provided on the outer peripheral wall of the second split part, and the sealing protrusion is provided around the outer periphery of the second split part.

[0014] Furthermore, the first channel includes: a first section, the first section is suitable for communicating with the second channel; a second section, one end of the second section is connected to the first section, the other end of the second section is provided with the separation membrane, and the diameter of the second section gradually increases in the direction approaching the separation membrane.

[0015] Furthermore, the separation membrane is constructed as a waterproof and breathable membrane.

[0016] Other advantages, objectives and features of the utility model will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art can be taught from the practice of the utility model. The objectives and other advantages of the utility model can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to make the purpose, technical solution and beneficial effects of the utility model clearer, the utility model is described with the following drawings:

[0018] Figure 1 It is a structural schematic diagram of the gas-liquid separator of the utility model;

[0019] Figure 2 It is a cross-sectional view of the gas-liquid separator of the utility model;

[0020] Figure 3 for Figure 2 The middle circle shows an enlarged view of A.

[0021] The following are marked in the accompanying drawings:

[0022] 1. Gas-liquid separator;

[0023] 10. Shell; 11. First pipe; 111. First channel; 1111. First section; 1112. Second section; 12. Second pipe; 121. Second channel; 122. First split part; 123. Second split part; 124. Sealing convex part; 13. End cover; 14. Operating ear; 15. Connecting ear;

[0024] 20. Separation membrane. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the utility model more clearly understood, the utility model is further described in detail below in conjunction with embodiments and drawings. The schematic implementation manner of the utility model and its description are only used to explain the utility model and are not intended to limit the utility model.

[0026] In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present invention. However, it is apparent to those skilled in the art that these specific details are not necessary to implement the present invention. In other examples, in order to avoid obscuring the present invention, well-known structures, circuits, materials or methods are not specifically described.

[0027] Throughout the specification, references to "one embodiment," "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment of the present invention. Therefore, the phrases "one embodiment," "an embodiment," "an example," or "an example" appearing in various places throughout the specification do not necessarily all refer to the same embodiment or example. In addition, particular features, structures, or characteristics may be combined in one or more embodiments or examples in any suitable combination and / or sub-combination. In addition, it will be appreciated by those of ordinary skill in the art that the figures provided herein are for illustrative purposes and that the figures are not necessarily drawn to scale. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0028] In the description of the present invention, it should be understood that the terms "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the scope of protection of the present invention.

[0029] Embodiment 1:

[0030] like Figure 1-Figure 3 As shown, the utility model provides a gas-liquid separator 1 for a battery assembly, comprising: a shell 10 and a separation membrane 20, wherein a first channel 111 and a second channel 121 that are connected to each other are formed in the shell 10, the first channel 111 extends in a height direction, the separation membrane 20 is arranged at one end of the first channel 111, and the separation membrane 20 is suitable for gas to pass through; wherein the second channel 121 is arranged between the separation membrane 20 and the other end of the first channel 111, and the electrolyte is suitable for entering from the second channel 121 and being discharged from the other end of the first channel 111.

[0031] In some embodiments, a first channel 111 is formed in the shell 10, and the first channel 111 has a first end and a second end in the height direction, the first end is located above the second end, and the second end is suitable for connecting with the battery liquid tank, and a separation membrane 20 is provided at the first end. The shell 10 also forms a second channel 121 located between the first end and the second end, and the second channel 121 is suitable for connecting with the battery cell to allow the reacted electrolyte in the battery cell to pass through.

[0032] In some embodiments, when the aluminum-alkali liquid flow battery assembly is in operation, the electrolyte circulation is: battery liquid tank-water pump-battery cell-gas-liquid separator-battery liquid tank. The electrolyte undergoes chemical reaction and discharges in the battery cell, and the overall reaction formula is: 4Al+3O2+6H2O+4KOH=4KAl(OH)4. However, a side reaction also occurs in the battery cell, and its reaction formula is: 2Al+6H2O=2Al(OH)3↓+3H2↑. The side reaction produces hydrogen. When the hydrogen separates from the electrolyte and leaves the circulation, it will take away some water and other media. The loss of these media will cause the electrical performance indicators of the low-power aluminum-alkali liquid flow battery assembly to decline.

[0033] It can be understood that the electrolyte that flows out of the battery cell and undergoes a chemical reaction can enter the battery liquid tank through the gas-liquid separator 1. In the gas-liquid separator 1 of the present application, the electrolyte flows through the second channel 121 and the first channel 111 in sequence and then enters the battery liquid tank. When the electrolyte flows to the junction of the first channel 111 and the second channel 121, due to the small mass fraction of hydrogen, the hydrogen will move upward and toward the first end when it follows the electrolyte to just flow to the first channel 111, and due to its large mass fraction, the electrolyte will fall when it flows to the first channel 111 and flow back to the battery liquid tank through the second end, that is, the electrolyte mixed with hydrogen can achieve gas-liquid separation in the first channel 111, and when the hydrogen passes through the separation membrane 20, the separation membrane 20 only allows hydrogen to pass through, and the water and other media carried by the hydrogen will be blocked by the separation membrane 20. When the water and other media blocked on the separation membrane 20 are too much, the water and other media can drip and enter the battery liquid tank through the first channel 111.

[0034] It is worth noting that the gas-liquid separator 1 of the present application has a simple structure, small size and low cost, which reduces the production cost and manufacturing difficulty of the aluminum-alkali liquid flow battery assembly, and facilitates the installation of the gas-liquid separator 1 on the aluminum-alkali liquid flow battery assembly. At the same time, it can facilitate the layout of other components of the aluminum-alkali liquid flow battery assembly and improve the assembly efficiency of the aluminum-alkali liquid flow battery assembly.

[0035] According to the gas-liquid separator 1 of the utility model, by arranging a separation membrane 20 at one end of the first channel 111, and the second channel 121 is located between the separation membrane 20 and the other end of the first channel 111, gas-liquid separation is achieved when the electrolyte mixed with hydrogen enters the first channel 111 through the second channel 121, and the water and other media carried by the hydrogen can be blocked by the separation membrane 20, so as to prevent the hydrogen from taking away the water and other media during the discharge process, thereby improving the electrical performance indicators of the battery cell, thereby improving the discharge efficiency of the aluminum-alkali liquid flow battery assembly. At the same time, the gas-liquid separator 1 of the present application has a simple structure, a small size and a low cost, which reduces the production cost and manufacturing difficulty of the aluminum-alkali liquid flow battery assembly, and facilitates the installation of the gas-liquid separator 1, thereby improving the assembly efficiency of the aluminum-alkali liquid flow battery assembly.

[0036] Embodiment 2:

[0037] In this embodiment, based on the first embodiment, the housing 10 includes: a first pipe 11 and a second pipe 12 . The first pipe 11 has a first channel 111 formed therein. The second pipe 12 is connected to the first pipe 11 . The second pipe 12 has a second channel 121 formed therein.

[0038] It can be understood that a first channel 111 is formed in the first pipe 11 and is axially connected therein, a second channel 121 is formed in the second pipe 12 and is axially connected therein, a mounting port connected to the first channel 111 is formed between one end and the other end of the first pipe 11, one end of the second pipe 12 is connected to the outer peripheral wall of the first pipe 11, and the second channel 121 is connected to the mounting port, thereby realizing the connection between the first channel 111 and the second channel 121. The shell 10 of the present application has a simple structure and is easy to manufacture, which improves the production efficiency of the shell 10, thereby improving the production efficiency of the gas-liquid separator 1.

[0039] According to some embodiments of the utility model, the shell 10 also includes: an end cover 13, on which a through hole is formed that penetrates in the thickness direction, and a first connecting portion and a second connecting portion are provided on the end cover 13, wherein the first connecting portion is suitable for connecting to the separation membrane 20, and the second connecting portion is suitable for connecting to the first pipe 11.

[0040] It is understood that the first connection portion is suitable for connecting with the separation membrane 20, that is, the end cap 13 can be tightly and stably connected with the separation membrane 20 through the first connection portion, which can be achieved by threads, buckles, bonding or other detachable / fixing mechanisms. Therefore, the above arrangement ensures that the separation membrane 20 maintains the correct position and sealing during use.

[0041] The end cover 13 is connected to the first pipe 11 through the second connection part, which ensures reliable sealing between the first pipe 11 and the end cover 13, and can be easily disassembled during installation and maintenance. The connection method can be a quick connector, a threaded connection or a dedicated sealing accessory, etc., which is not limited here. A through hole is formed on the end cover 13, and the through hole is directly opposite to the first channel 111. The through hole is suitable for hydrogen to pass through, so as to avoid the end cover 13 blocking the discharge of hydrogen and ensure the normal operation of the gas-liquid separator 1.

[0042] In some embodiments, the first pipe 11 and the second pipe 12 are arranged perpendicular to each other to facilitate the production and assembly of the first pipe 11 and the second pipe 12. At the same time, the second pipe 12 perpendicular to the first pipe 11 can be easily matched with the pipeline of the aluminum-alkali liquid flow battery assembly (the pipeline, such as the elbow, etc. is mostly constructed at 90°, so the above-mentioned arrangement can facilitate the connection between the elbow and the second pipe 12), thereby facilitating the assembly of the aluminum-alkali liquid flow battery assembly.

[0043] Preferably, a connecting ear 15 is further provided at one end of the first pipe 11 away from the separation membrane 20. The connecting ear 15 is arranged around the outer peripheral wall of the first pipe 11 and extends radially. The connecting ear 15 is provided with a plurality of connecting holes penetrating the thickness. The screw passes through the connecting hole and is threadedly connected to the threaded hole of the battery liquid tank to connect the gas-liquid separator 1 to the battery liquid tank. The connection between the gas-liquid separator 1 and the battery liquid tank is simple.

[0044] Embodiment three:

[0045] In this embodiment, based on the second embodiment, the outer peripheral wall of the separation membrane 20 is provided with a third connection part, the inner peripheral wall of the end cover 13 is provided with a first connection part, and the first connection part and the third connection part are detachably matched; the inner peripheral wall of the first pipe 11 is provided with a fourth connection part, and the outer peripheral wall of the end cover 13 is provided with a second connection part, and the second connection part and the fourth connection part are detachably matched.

[0046] It can be understood that the third connection part is arranged on the outer peripheral wall of the separation membrane 20, which serves as an interface connected to the end cover 13. The third connection part can be an annular flange, a threaded ring, a slot or other structures that are easy to match with the end cover 13. The first connection part is located on the inner peripheral wall of the end cover 13, which corresponds to the third connection part of the separation membrane 20. The design of the first connection part needs to match the third connection part in structure to ensure that the two can be tightly and accurately docked and can achieve detachable cooperation, which can be achieved by means such as quick release bayonet, screw fixing, etc. Therefore, through the above design, it can be ensured that the separation membrane 20 can be firmly installed in the predetermined position, and at the same time, it can be conveniently disassembled for cleaning, inspection or replacement when necessary.

[0047] At the same time, the fourth connection part is arranged on the inner peripheral wall of the first pipe 11, and its function is to establish a connection with the end cover 13 to ensure the sealing and stability of the pipe. The fourth connection part is a structure designed for detachable matching, which can be in the form of thread, concave-convex tenon joint, etc. The second connection part is arranged on the outer peripheral wall of the end cover 13, and is suitable for matching with the fourth connection part of the first pipe 11. Therefore, the second connection part cooperates with the fourth connection part to ensure the reliable connection between the end cover 13 and the first pipe 11, and is easy to disassemble and assemble to meet the needs of maintenance and overhaul.

[0048] It is worth noting that the inner circumferential wall and the outer circumferential wall of the end cover 13 are respectively formed with a first connecting portion and a second connecting portion, that is, the radial projections of the first connecting portion and the second connecting portion of the end cover 13 at least partially overlap. Therefore, through the above arrangement, the length dimension of the end cover 13 in its own radial direction can be reduced, thereby further optimizing the structure of the gas-liquid separator 1 and reducing the volume of the gas-liquid separator 1.

[0049] According to some embodiments of the utility model, an operating ear 14 is provided on the end cover 13, and the two ends of the operating ear 14 are respectively connected to the two ends of the end cover 13 in the radial direction. In some embodiments, the second connection portion is configured as a first thread provided on the outer peripheral wall of the end cover 13, and the fourth connection portion is configured as a second thread provided on the inner peripheral wall of the first pipe 11, and the first thread and the second thread are threadedly matched to realize the connection between the end cover 13 and the first pipe 11. The design of the operating ear 14 can facilitate the operator to control the rotation of the end cover 13 relative to the first pipe 11, thereby facilitating the disassembly and connection of the end cover 13 and the first pipe 11, and improving the convenience of disassembly and assembly of the end cover 13 and the first pipe 11.

[0050] Embodiment 4:

[0051] In this embodiment, based on the second embodiment, the gas-liquid separator 1 further includes: a temperature sensor, which is connected to the second pipe 12 and is suitable for detecting the temperature of the electrolyte in the second channel 121. It can be understood that the temperature sensor is suitable for detecting the temperature of the electrolyte in the second pipe 12, and the operator can monitor the working state of the aluminum-alkali liquid flow battery assembly according to the displayed value of the temperature sensor.

[0052] According to some embodiments of the utility model, the second pipeline 12 includes: a first split part 122 and a second split part 123, one end of the first split part 122 is connected to the first pipeline 11, a temperature sensor is provided on the first split part 122, the second split part 123 is connected to the other end of the first split part 122, and the second split part 123 is suitable for cooperating with the pipeline.

[0053] In some embodiments, the cross section of the first split part 122 can be configured as a square, so that the first split part 122 can be easily connected to the first pipeline 11 and the first split part 122 can be easily connected to the temperature sensor. At the same time, the cross section of the second split part 123 can be configured as a circular ring, so that the second split part 123 can be easily connected to the pipeline of the aluminum-alkali liquid flow battery assembly. Therefore, the above arrangement can improve the assembly efficiency of each component of the gas-liquid separator 1, thereby improving the production efficiency of the gas-liquid separator 1.

[0054] According to some embodiments of the utility model, the outer peripheral wall of the second split part 123 is provided with a sealing protrusion 124, and the sealing protrusion 124 is arranged around the outer periphery of the second split part 123. It can be understood that the sealing protrusion 124 is arranged around the outer periphery of the second split part 123, and the sealing protrusion 124 is suitable for cooperating with the inner peripheral wall of the pipeline, thereby ensuring the sealed connection between the second split part 123 and the pipeline to prevent electrolyte leakage.

[0055] Embodiment five:

[0056] In this embodiment, based on the first embodiment, the first channel 111 includes: a first section 1111 and a second section 1112, the first section 1111 is suitable for being connected to the second channel 121, one end of the second section 1112 is connected to the first section 1111, and the other end of the second section 1112 is provided with a separation membrane 20, and the diameter of the second section 1112 gradually increases in the direction approaching the separation membrane 20.

[0057] It can be understood that one end of the first section 1111 is suitable for being connected to the battery liquid tank, the other end of the first section 1111 is connected to one end of the second section 1112, and the other end of the second section 1112 is suitable for being connected to the separation membrane 20. In the direction approaching the separation membrane 20, the diameter of the second section 1112 gradually increases, thereby forming a flare toward the separation membrane 20 in the second section 1112, thereby increasing the hydrogen passage area, thereby improving the hydrogen discharge efficiency, and improving the working efficiency of the gas-liquid separator 1.

[0058] According to some embodiments of the present invention, the separation membrane 20 is constructed as a waterproof and breathable membrane. It can be understood that the waterproof and breathable membrane can only allow gas to pass through, while water and other media cannot pass through. Therefore, the present application adopts a waterproof and breathable membrane to achieve the goal of only allowing hydrogen to pass through, and water in the electrolyte and other media cannot pass through the waterproof and breathable membrane, thereby avoiding the discharge of water in the electrolyte and other media, and ensuring the electrical performance indicators of the aluminum alkaline liquid flow battery assembly.

[0059] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the utility model.

Claims

1. A gas-liquid separator for a battery assembly, characterized in that: include: A housing (10), wherein a first channel (111) and a second channel (121) communicating with each other are formed in the housing (10), and the first channel (111) extends in a height direction; a separation membrane (20), the separation membrane (20) being arranged at one end of the first channel (111), the separation membrane (20) being suitable for gas to pass through; wherein The second channel (121) is arranged between the separation membrane (20) and the other end of the first channel (111), and the electrolyte is suitable for entering from the second channel (121) and being discharged from the other end of the first channel (111).

2. The gas-liquid separator for a battery assembly according to claim 1, characterized in that: The housing (10) comprises: A first pipe (11), wherein the first channel (111) is formed in the first pipe (11); A second pipe (12), the second pipe (12) is connected to the first pipe (11), and the second channel (121) is formed in the second pipe (12).

3. The gas-liquid separator for a battery assembly according to claim 2, characterized in that: The housing (10) further comprises: An end cover (13), wherein a through hole penetrating in the thickness direction is formed on the end cover (13), and a first connecting portion and a second connecting portion are provided on the end cover (13), wherein the first connecting portion is suitable for connecting to the separation membrane (20), and the second connecting portion is suitable for connecting to the first pipe (11).

4. The gas-liquid separator for a battery assembly according to claim 3, characterized in that: The outer peripheral wall of the separation membrane (20) is provided with a third connection portion, and the inner peripheral wall of the end cover (13) is provided with a first connection portion, and the first connection portion and the third connection portion are detachably matched; The inner peripheral wall of the first pipe (11) is provided with a fourth connecting portion, and the outer peripheral wall of the end cover (13) is provided with a second connecting portion, and the second connecting portion is detachably matched with the fourth connecting portion.

5. The gas-liquid separator for a battery assembly according to claim 4, characterized in that: An operating ear (14) is provided on the end cover (13), and two ends of the operating ear (14) are respectively connected to two ends of the end cover (13) in the radial direction.

6. The gas-liquid separator for a battery assembly according to claim 2, characterized in that: Also includes: A temperature sensor is connected to the second pipe (12) and is suitable for detecting the temperature of the electrolyte in the second channel (121).

7. The gas-liquid separator for a battery assembly according to claim 6, characterized in that: The second pipeline (12) comprises: a first split part (122), one end of the first split part (122) being connected to the first pipe (11), and the temperature sensor being arranged on the first split part (122); The second split part (123) is connected to the other end of the first split part (122), and the second split part (123) is suitable for matching with a pipeline.

8. The gas-liquid separator for a battery assembly according to claim 7, characterized in that: The outer peripheral wall of the second split portion (123) is provided with a sealing protrusion (124), and the sealing protrusion (124) is arranged around the outer periphery of the second split portion (123).

9. The gas-liquid separator for a battery assembly according to claim 1, characterized in that: The first channel (111) comprises: a first section (1111), the first section (1111) being adapted to communicate with the second channel (121); A second section (1112), one end of the second section (1112) is connected to the first section (1111), the other end of the second section (1112) is provided with the separation membrane (20), and the diameter of the second section (1112) gradually increases in a direction approaching the separation membrane (20).

10. The gas-liquid separator for a battery assembly according to claim 1, characterized in that: The separation membrane (20) is constructed as a waterproof and breathable membrane.

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