A battery formation filtration device

Abstract

The utility model relates to battery formation filtering device technical field, especially, relate to a kind of battery formation filtering device, including gas-liquid separation device of gas-liquid separation system, negative pressure main pipe and the filtering device connected between the gas-liquid separation device and negative pressure main pipe;The negative pressure main pipe is equipped with filter system;The filtering device includes the filter shell with empty cavity inside;The gas-liquid separation device and negative pressure main pipe are respectively communicated with the empty cavity in the filter shell, respectively as first communication and second communication;Filtering layer is built-in between the first communication and second communication in the empty cavity.This utility model filtering device provides primary filtration for negative pressure main pipe, filters waste liquid in waste gas generated by formation, part of residual gas-liquid is brought into negative pressure main pipe, and the filter system of negative pressure main pipe is equipped with secondary filtration, to avoid pollution main pipe, the filtering device of the utility model is not easy to crystallize, and the filtration area is large, can work for a long time, easy to clean, and liquid discharge is convenient.

Description

Technical Field

[0001] This utility model relates to the technical field of battery formation filtration devices, and in particular to a battery formation filtration device. Background Technology

[0002] The battery formation process is the first charging process after the lithium battery is filled with electrolyte. This process activates the active materials in the battery, putting the lithium battery into an activated state. At the same time, the lithium salt reacts with the electrolyte to form a solid electrolyte interphase (SEI) film on the negative electrode side of the lithium battery. This film can prevent further side reactions from occurring, thereby reducing the loss of active lithium in the lithium battery.

[0003] During this process, flammable gases volatilized from the electrolyte and waste gases produced by the electrochemical reaction may create an explosive environment. If these gases are not removed in time, they may cause the battery to expand in size and increase impedance, thereby affecting the battery's performance and lifespan.

[0004] The existing structure consists of a gas-liquid separation system corresponding to the formation equipment, comprising a gas-liquid separation unit, a molecular sieve, and a negative pressure manifold. In the installation mechanism, multiple gas-liquid separation units form a negative pressure control cabinet. One end of the molecular sieve is connected to the negative pressure manifold within the installation site, and the other end is connected to a gas-liquid separation unit. The negative pressure manifold is connected to an air compressor. When the air compressor is started, it draws negative pressure into the negative pressure manifold, thereby drawing the organic gases from the gas-liquid separation unit into the molecular sieve. The molecular sieve is a key functional material that preferentially adsorbs polar molecules (such as water and HF) and unsaturated molecules through strong polarity and a Coulombic field within its pores, achieving separation through physical adsorption. It is used to adsorb residual moisture inside the battery and gases generated by side reactions in the electrolyte (such as HF and CO2), thereby improving the battery's cycle performance and safety.

[0005] After a period of adsorption, molecular sieves will accumulate crystals in their pores, causing molecular sieve filtration failure. When organic gas is drawn into negative pressure, it is carried into the air compressor, causing blockage of the air compressor pipeline, affecting the operation of the air compressor, and even paralyzing the entire negative pressure system. Utility Model Content

[0006] The purpose of this invention is to provide a battery formation filtration device. The technical solution provided by this invention solves the technical problem that after a period of adsorption, molecular sieves will accumulate crystals in their pores, causing molecular sieve filtration failure, which in turn allows organic gases to be carried into the air compressor, causing blockage of the air compressor pipeline.

[0007] To address the aforementioned technical problems, this utility model provides a battery formation filtration device, comprising a gas-liquid separation device of a gas-liquid separation system, a negative pressure main pipe, and a filtration device connected between the gas-liquid separation device and the negative pressure main pipe; the negative pressure main pipe has its own filtration system; the filtration device includes a filter housing with an internal cavity; the gas-liquid separation device and the negative pressure main pipe are respectively connected to the cavity inside the filter housing, which are respectively a first connection point and a second connection point; a filter layer is built into the cavity between the first connection point and the second connection point.

[0008] Preferably, the filter layer wraps around the first and second connecting points, forming an air inlet chamber and an air outlet chamber, respectively.

[0009] Preferably, a replacement window for replacing the filter layer is formed on the filter housing; a sealing plate is detachably provided on the replacement window.

[0010] Preferably, a drain hole with a valve and an air guide hole are respectively provided on the filter housing; the drain hole is located on the bottom surface of the filter housing, and the air guide hole is located at a position not lower than the drain hole.

[0011] Preferably, the filter layer wraps around the drain hole to form a liquid storage chamber.

[0012] Preferably, the liquid storage chamber and the air inlet chamber are integrated into one unit.

[0013] Preferably, the filter layer is an activated carbon filter element.

[0014] Preferably, it also includes a molecular sieve; the molecular sieve is disposed between the filter device and the negative pressure main pipe.

[0015] Compared with the prior art, this utility model adds a filtration device between the gas-liquid separation device and the negative pressure main pipe. In addition to the filtration system built into the negative pressure main pipe, the filtration device of this utility model provides primary filtration for the negative pressure main pipe, filtering out the waste liquid in the waste gas generated by the formation. Some residual gas and liquid are carried into the negative pressure main pipe, where the filtration system built into the negative pressure main pipe performs secondary filtration to avoid contamination of the main pipe. The filtration device of this utility model is not prone to crystallization, has a large filtration area, can work for a long time, is easy to clean, convenient to drain, and easy to install and disassemble. Attached Figure Description

[0016] Figure 1 This is a connection block diagram of the battery formation and filtration device according to an embodiment of this application;

[0017] Figure 2 This is a schematic diagram of the filtering device structure according to an embodiment of this application;

[0018] Figure 3 This is a schematic diagram of the filter housing structure according to an embodiment of this application. Detailed Implementation

[0019] 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.

[0020] Currently, chemical formation equipment that uses molecular sieves to filter waste gas will experience crystal buildup in the pores of the molecular sieves after a period of adsorption, leading to filtration failure. When organic gas is drawn into negative pressure, it is carried to the air compressor, causing blockage in the air compressor pipeline, affecting the operation of the air compressor, and even paralyzing the entire negative pressure system.

[0021] Please see Figure 1 To address the aforementioned technical problems, this embodiment provides a battery formation filtration device, including a gas-liquid separation device 20 of a gas-liquid separation system, a negative pressure main pipe 30, and a filtration device 10 connected between the gas-liquid separation device 20 and the negative pressure main pipe 30. The filtration device 10 is connected to the gas-liquid separation device 20 and the negative pressure main pipe 30, forming a primary filtration; the negative pressure main pipe 30 has its own filtration system, forming a secondary filtration. During the formation process, the formation equipment generates waste gas. After passing through the gas-liquid separation device 20, the waste gas enters the filtration device 10. The filtration device 10 provides primary filtration, filtering out the waste liquid in the waste gas generated during formation. Some residual gas and liquid are carried into the negative pressure main pipe 30, where its own filtration system performs secondary filtration to prevent contamination of the main pipe.

[0022] Please see Figures 2-3 Specifically, the filter device 10 includes a filter housing 40 with an internal cavity 41. The gas-liquid separation device 20 and the negative pressure main pipe 30 are respectively connected to the cavity 41 inside the filter housing 40, which are the first connection point 42 and the second connection point 43. As shown in the figure, multiple first connection points 42 are provided, which can connect multiple gas-liquid separation devices 20 at the same time, and provide primary filtration for multiple chemical formation devices.

[0023] To achieve primary filtration of exhaust gas, this embodiment incorporates a filter layer 50 within the cavity 41, between the first connecting portion 42 and the second connecting portion 43. The filter layer 50 encloses the first connecting portion 42 and the second connecting portion 43, forming an inlet chamber 44 and an outlet chamber 45, respectively. In this embodiment, the filter layer 50 is cuboid in shape, with the inlet chamber 44 and outlet chamber 45 located on opposite sides of the cuboid. The edges of the filter layer 50 are tightly fitted to the sidewalls of the filter housing 40, eliminating any gaps between the inlet chamber 44 and the outlet chamber 45. All exhaust gas entering the inlet chamber 44 passes through the filter layer 50 and enters the outlet chamber 45.

[0024] In order to achieve primary filtration of exhaust gas, the filter layer 50 in this embodiment can be an activated carbon filter element.

[0025] Besides the aforementioned regular cuboid shape, the filter layer 50 in this embodiment can also adopt an irregular shape. For example, the filter layer 50 can fill the entire cavity 41 inside the filter housing 40, with two spatial chambers, an air inlet chamber 44 and an air outlet chamber 45, only carved out at the first connecting point 42 and the second connecting point 43, while still satisfying the prerequisite that the filter layer 50 is wrapped around the first connecting point 42 and the second connecting point 43; or it can adopt a triangular prism, with two edges abutting against the two inner sides of the cavity 41 and the third edge abutting against the side wall of the cavity 41, dividing the cavity 41 into left and right sides to form the air inlet chamber 44 and the air outlet chamber 45. It should be noted that although the filter layer 50 in this embodiment adopts a cuboid, triangular prism, or irregular shape, its main purpose is that the filter layer 50 only needs to wrap around the first connecting point 42 and the second connecting point 43, so that all the exhaust gas entering the air inlet chamber 44 passes through the filter layer 50 and enters the air outlet chamber 45. Therefore, the filter layer 50 can adopt various shapes while satisfying the prerequisite that it is wrapped around the first connecting point 42 and the second connecting point 43.

[0026] To facilitate the replacement of the filter layer 50, this embodiment has a replacement window 46 formed on the filter housing 40 for replacing the filter layer 50. A sealing plate (not shown in the figure) is detachably installed on the replacement window 46. When the filter layer 50 needs to be replaced, the sealing plate is removed, the old filter layer 50 is taken out through the replacement window 46, and the new filter layer 50 is installed to complete the replacement of the filter layer 50. The filter layer 50 is easy to replace and can work for a long time.

[0027] Because waste liquid condenses after the exhaust gas passes through the filter layer 50, and the waste liquid remains in the cavity 41 of the filter housing 40, this embodiment provides a drain hole 47 with a valve and a vent hole 48 on the filter housing 40 to discharge the waste liquid. The drain hole 47 is located on the bottom surface of the filter housing 40, and the vent hole 48 is located at a position no lower than the drain hole 47. When it is necessary to discharge the waste liquid, the valve on the vent hole 48 is opened, and then the valve on the drain hole 47 is opened, allowing the waste liquid in the cavity 41 to flow out from the drain hole 47, thus achieving the effect of draining the waste liquid.

[0028] Furthermore, the filter layer 50 wraps around the drain hole 47 to form a liquid storage chamber, which can store a certain amount of waste liquid and only needs to be drained once every once in a while.

[0029] To simplify the shape design of the filter layer 50, the liquid storage chamber and the air inlet chamber 44 can be integrated, that is, the liquid storage chamber and the air inlet chamber 44 are shared. The drain hole at the liquid storage chamber is also located on the bottom surface of the filter housing 40 to prevent waste liquid from being discharged from the first connection 42 and affecting the entry of waste gas.

[0030] To further improve the filtration effect of exhaust gas, a molecular sieve can be added between the filter device 10 and the negative pressure main pipe 30 in this embodiment. The exhaust gas after passing through the filter device 10 passes through the molecular sieve. The strong polarity and coulombic field in its pores can further adsorb polar molecules (such as water and HF) and unsaturated molecules of the exhaust gas, achieving separation through physical adsorption. It can also further adsorb residual moisture and gases generated by side reactions of the electrolyte inside the battery.

[0031] In summary, this embodiment adds a filtration device between the gas-liquid separation device and the negative pressure main pipe. In addition to the filtration system built into the negative pressure main pipe, the filtration device of this invention provides primary filtration for the negative pressure main pipe, filtering out the waste liquid in the waste gas generated by the formation. Some residual gas and liquid are carried into the negative pressure main pipe, where the filtration system built into the negative pressure main pipe performs secondary filtration to avoid contaminating the main pipe. The filtration device of this invention is not prone to crystallization, has a large filtration area, can work for a long time, is easy to clean, convenient to drain, and easy to install and disassemble.

[0032] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A battery formation filtration apparatus, characterized by: The system includes a gas-liquid separation device, a negative pressure main pipe, and a filter device connected between the gas-liquid separation device and the negative pressure main pipe; the negative pressure main pipe has its own filter system; the filter device includes a filter housing with an internal cavity; the gas-liquid separation device and the negative pressure main pipe are respectively connected to the cavity in the filter housing, which are respectively a first connection point and a second connection point; a filter layer is built into the cavity between the first connection point and the second connection point.

2. The battery formation filtration device of claim 1, wherein: The filter layer wraps around the first and second connecting points, forming an air inlet chamber and an air outlet chamber, respectively.

3. The battery formation filtration apparatus of claim 2, wherein: A replacement window for replacing the filter layer is formed on the filter housing; a sealing plate is detachably provided on the replacement window.

4. The battery formation filtration apparatus of claim 2, wherein: The filter housing is provided with a drain hole and an air guide hole, both equipped with valves. The drain hole is located on the bottom surface of the filter housing, and the air guide hole is located at a position not lower than the drain hole.

5. The battery formation filtration apparatus of claim 4, wherein: The filter layer wraps around the drain hole to form a liquid storage chamber.

6. The battery formation filtration apparatus of claim 5, wherein: The liquid storage chamber and the air inlet chamber are integrated into one unit.

7. The battery formation filtration apparatus of claim 1, wherein: The filter layer is an activated carbon filter element.

8. The battery formation filtration device of any one of claims 1-7, wherein: It also includes a molecular sieve; the molecular sieve is disposed between the filter device and the negative pressure main pipe.

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